阅读说明：本技术 适用于架式栽培的水肥一体化智能灌溉控制方法 (Water and fertilizer integrated intelligent irrigation control method suitable for rack type cultivation ) 是由 王辉 伍琪婧 卢佳宇 陈炜 李博文 于 2021-10-19 设计创作，主要内容包括：适用于架式栽培的水肥一体化智能灌溉控制方法,包括多层种植架部分、灌溉控制部分和升降控制部分,多层种植架上设置有多层栽培基质,栽培基质层内设置有陶土管,利用滑轮装置的等杠杆原理实现储液罐自我势能的转换,电动推杆装置仅需克服系统阻力即可改变储液罐的高度位置,控制器根据传感器的反馈数据控制电磁阀的开关及储液罐的升降实现对陶土管的正负压供给水肥养料,进而使栽培基质含水率始终保持在蔬菜生长所需的最优含水率区间内,以真正实现按多层不同类别蔬菜及同一种蔬菜不同生长期所需水肥养料的智能供给。(The water and fertilizer integrated intelligent irrigation control method suitable for rack type cultivation comprises a multilayer planting frame part, an irrigation control part and a lifting control part, wherein multilayer cultivation media are arranged on the multilayer planting frame, argil pipes are arranged in the cultivation media, self potential energy conversion of a liquid storage tank is realized by utilizing an equal lever principle of a pulley device, the height position of the liquid storage tank can be changed by only overcoming system resistance through an electric push rod device, a controller controls a switch of an electromagnetic valve and lifting of the liquid storage tank according to feedback data of a sensor to realize positive and negative pressure water and fertilizer nutrient supply to the argil pipes, and further, the water content of the cultivation media is always kept in an optimal water content interval required by growth of vegetables, so that intelligent supply of the water and fertilizer nutrient required by different growth periods of multiple layers of different vegetables and the same vegetable is really realized.)

1. A water and fertilizer integrated intelligent irrigation control method suitable for rack type cultivation comprises a multilayer planting rack part, an irrigation control part and a lifting control part, wherein the multilayer planting rack part comprises a support frame, a cultivation medium and a clay pipe, the irrigation control part comprises a water and fertilizer integrated tank, a liquid storage tank, a temperature and humidity sensor, a controller, a multi-way pipe joint, a liquid level sensor, a normally open solenoid valve and a normally closed solenoid valve, the water and fertilizer integrated tank, the liquid storage tank, the solenoid valve, the multi-way pipe joint and the clay pipe are connected through a transfusion pipeline, the controller receives signals of the temperature and humidity sensor and the liquid level sensor and controls the power on and off of the normally open solenoid valve and the normally closed solenoid valve, the lifting control part comprises a pulley device, a slip stopping piece, a supporting plate, a weighing sensor, an electric push rod device and a cable, the cable passes through the pulley device, the liquid storage tanks are respectively arranged at two ends of the cable, and the intelligent irrigation control device is characterized in that, a cultivation substrate is arranged on the support frame, argil pipes are arranged in the cultivation substrate, an outlet of the water and fertilizer integrated tank is respectively connected with inlets of a first normally closed solenoid valve and a second normally closed solenoid valve through a first multi-way pipe joint, an outlet of the first normally closed solenoid valve is connected with an inlet of a first liquid storage tank, an outlet of the second normally closed solenoid valve is connected with an inlet of a second liquid storage tank, an outlet of the first liquid storage tank is connected with an inlet of a second multi-way pipe joint, inlets of a fourth layer normally open solenoid valve, a fifth layer normally open solenoid valve, a sixth layer normally open solenoid valve and a third normally closed solenoid valve are respectively connected with an outlet of the second multi-way pipe joint, an outlet of the fourth layer normally open solenoid valve is connected with a fourth argil pipe, an outlet of the fifth layer normally open solenoid valve is connected with a fifth argil pipe, an outlet of the sixth layer normally open solenoid valve is connected with a sixth layer argil pipe, an outlet of the third normally closed solenoid valve is connected with an inlet of the third multi-way pipe joint, the inlet of the first layer of normally open solenoid valve, the inlet of the second layer of normally open solenoid valve and the inlet of the third layer of normally open solenoid valve are respectively connected with the outlet of the third multi-way pipe joint, the outlet of the first layer of normally open solenoid valve is connected with the first layer of clay pipe, the outlet of the second layer of normally open solenoid valve is connected with the second layer of clay pipe, the outlet of the third layer of normally open solenoid valve is connected with the third layer of clay pipe, the inlets of the first normally open solenoid valve and the fourth normally closed solenoid valve are respectively connected with the outlet of the second liquid storage tank, the outlet of the fourth normally closed solenoid valve is connected with the inlet of the second multi-way pipe joint, the outlet of the first normally open solenoid valve is connected with the inlet of the fourth multi-way pipe joint, and the outlet of the fourth multi-way pipe joint is respectively connected with the inlets of the first layer of normally open solenoid valve, the second layer of normally open solenoid valve and the third layer of normally open solenoid valve;

the second electric push rod device pushes the first liquid storage tank and the first electric push rod device pushes the second liquid storage tank to the initial height, the mooring rope is kept in a tensioning state, the controller respectively controls the first normally closed solenoid valve and the second normally closed solenoid valve to be powered on and opened, water and fertilizer nutrient liquid in the water and fertilizer integrated tank is respectively injected into the first liquid storage tank and the second liquid storage tank, when the second liquid level sensor and the third liquid level sensor respectively detect that the liquid level value reaches a set value, the controller respectively controls the first normally closed solenoid valve and the second normally closed solenoid valve to be powered off and closed, the water and fertilizer nutrient liquid conveying to the first liquid storage tank and the second liquid storage tank is stopped, the first liquid injection is completed, in the process, each normally open solenoid valve is in a power-off normally closed state, each normally closed solenoid valve is in a power-off normally closed state, and the water and fertilizer nutrient in the first liquid storage tank is respectively conveyed to four layers of argil pipes and the four layers of argil pipes in a negative pressure irrigation mode, Five layers of clay pipes, six layers of clay pipes, wherein water and fertilizer nutrients in a second liquid storage tank are respectively conveyed to one layer of clay pipes, two layers of clay pipes and three layers of clay pipes in a negative pressure irrigation mode, when a second liquid level sensor in the first liquid storage tank detects that the liquid level is lower than a set value, a controller controls a first normally closed solenoid valve to be powered on and opened, liquid is filled into the first liquid storage tank, when the liquid level is recovered to the set value, the controller controls the first normally closed solenoid valve to be powered off and closed, liquid filling into the first liquid storage tank is stopped, when a third liquid level sensor in the second liquid storage tank detects that the liquid level is lower than the set value, the controller controls the second normally closed solenoid valve to be powered on and opened, liquid is filled into the second liquid storage tank, when the liquid level is recovered to the set value, the controller controls the second normally closed solenoid valve to be powered off and closed, liquid filling into the second liquid storage tank is stopped, when the first liquid level sensor in the water and fertilizer integrated tank detects that the liquid level is lower than the set value, the controller gives an alarm to prompt a worker to add water, fertilizer and nutrient in time, when the humidity of the culture substrate is lower than a set lower limit value, the controller performs normal-pressure or positive-pressure irrigation by controlling the switch of the electromagnetic valve and the height of the liquid storage tank, when the normal-pressure or positive-pressure irrigation reaches a set middle value of the humidity of the culture substrate, the controller switches the irrigation mode to a negative-pressure or pause state by controlling the switch of the electromagnetic valve and the height of the liquid storage tank, and the steps are repeated in a circulating manner;

the first liquid storage tank and the second liquid storage tank can respectively carry out negative pressure, normal pressure or positive pressure irrigation on one layer, two layers, three layers, four layers, five layers and six layers, the first liquid storage tank can carry out the normal pressure or positive pressure irrigation on one layer, two layers and three layers while carrying out the negative pressure irrigation on the four layers, five layers and six layers, the second liquid storage tank can carry out the negative pressure irrigation on the four layers, five layers and six layers while carrying out the normal pressure or positive pressure irrigation on one layer, two layers and three layers, and the first liquid storage tank and the second liquid storage tank can be used alternately.

2. The water and fertilizer integrated intelligent irrigation control method suitable for rack cultivation according to claim 1, wherein when the humidity of the first, second and third layers of cultivation media is lower than a set lower limit value, the first electric push rod device pushes the second liquid storage tank to go up for normal pressure or positive pressure irrigation, if normal pressure or positive pressure irrigation is performed on only one layer or both layers, the controller does not need to command control the one-layer normally open solenoid valve or both the one-layer normally open solenoid valve and the two-layer normally open solenoid valve, the one-layer normally open solenoid valve, the two-layer normally open solenoid valve and the three-layer normally open solenoid valve are all in a power-off normally open state, if normal pressure or positive pressure irrigation is performed on only three layers or both layers, the controller respectively commands control the one-layer normally open solenoid valve, both-layer normally open solenoid valve or only one-layer normally open solenoid valve, and only performs normal pressure or positive pressure irrigation on three layers, the first layer of normally open electromagnetic valve and the second layer of normally open electromagnetic valve are in an electrified closed state, when normal-pressure or positive-pressure irrigation is carried out on the second layer and the third layer, the first layer of normally open electromagnetic valve is in an electrified closed state, and in the process, the third normally closed electromagnetic valve and the fourth normally closed electromagnetic valve are in an electrified closed state;

when the humidity of the four-layer, five-layer and six-layer cultivation media is lower than a set lower limit value, the second electric push rod device pushes the first liquid storage tank to carry out normal-pressure or positive-pressure irrigation in an ascending mode, if only four-layer or five-layer cultivation media are irrigated in normal-pressure or positive-pressure mode, the controller does not need to conduct instruction control on the four-layer normally open solenoid valve or four-layer normally open solenoid valve simultaneously, and five-layer normally open solenoid valve, the four-layer normally open solenoid valve, five-layer normally open solenoid valve and six-layer normally open solenoid valve are in power-off normally open state, if only six-layer or five-layer or six-layer normal-pressure or positive-pressure irrigation is conducted simultaneously, the controller conducts instruction control on the four-layer normally open solenoid valve, five-layer normally open solenoid valve or four-layer normally open solenoid valve separately, five-layer normally open solenoid valve is in power-on normally open state, and five-layer normally open solenoid valve, When the six layers of irrigation are irrigated under normal pressure or positive pressure, the four layers of normally open electromagnetic valves are in an electrified closed state, and in the process, the third normally closed electromagnetic valve and the fourth normally closed electromagnetic valve are in an electrified closed state;

when the humidity of the four-layer, five-layer and six-layer cultivation media is lower than a set lower limit value, the first electric push rod device pushes the second liquid storage tank to perform normal-pressure or positive-pressure irrigation in an ascending mode, if only four-layer or five-layer cultivation media are subjected to normal-pressure or positive-pressure irrigation simultaneously, the controller does not need to perform instruction control on the four-layer normally open solenoid valve or four-layer normally open solenoid valve simultaneously, and five-layer normally open solenoid valve, the four-layer normally open solenoid valve, five-layer normally open solenoid valve and six-layer normally open solenoid valve are in a power-off normally open state, if only six-layer or five-layer or six-layer normal-pressure or positive-pressure irrigation simultaneously is performed, the controller respectively performs instruction control on the four-layer normally open solenoid valve, five-layer normally open solenoid valve or four-layer normally open solenoid valve independently, and the five-layer normally open solenoid valve is in a power-on closed state, and five-layer or five-layer normally open solenoid valve is in a power-on normally open state, When normal pressure or positive pressure irrigation is carried out on the six layers, the four layers of normally open electromagnetic valves are in an electrified closing state, in the process, the third normally closed electromagnetic valve is in an electrified closing state, the fourth normally closed electromagnetic valve is in an electrified opening state, and the first normally open electromagnetic valve is in an electrified closing state;

when the humidity of the first-layer, second-layer and third-layer cultivation media is lower than a set lower limit value, the second electric push rod device pushes the first liquid storage tank to perform normal-pressure or positive-pressure irrigation in an ascending mode, if only one layer or one layer and two layers are subjected to normal-pressure or positive-pressure irrigation simultaneously, the controller does not need to perform instruction control on the one-layer normally-open electromagnetic valve or the one-layer normally-open electromagnetic valve and the two-layer normally-open electromagnetic valve simultaneously, the one-layer normally-open electromagnetic valve, the two-layer normally-open electromagnetic valve and the three-layer normally-open electromagnetic valve are in a power-off normally-open state, if only the three-layer or two layers and three layers are subjected to normal-pressure or positive-pressure irrigation simultaneously, the controller performs instruction control on the one-layer normally-open electromagnetic valve, the two-layer normally-open electromagnetic valve or the one-layer normally-open electromagnetic valve separately, and when only the three-layer is subjected to normal-pressure or positive-pressure irrigation, the one-layer normally-open electromagnetic valve, the two-layer normally-open electromagnetic valve is in a power-on closed state, and the two-layer normally-open electromagnetic valve is in a power-on state, When three layers of irrigation are irrigated under normal pressure or positive pressure, the normally open electromagnetic valve of one layer is in a power-on closed state, in the process, the third normally closed electromagnetic valve is in a power-on open state, the fourth normally closed electromagnetic valve is in a power-off closed state, and the first normally open electromagnetic valve is in a power-on closed state;

when one deck, two floors, three-layer, four floors, five floors, when six layers of culture medium's humidity all is less than the lower limit value of settlement, second electric putter device promotes first liquid storage pot and goes upward to carry out ordinary pressure or malleation and irrigate, at this in-process, fourth normally closed solenoid valve is in the outage off-state, first normally open solenoid valve is in the off-state that has got the electricity, third normally closed solenoid valve is in the on-state that has got the electricity, one deck normally open solenoid valve, two floors normally open solenoid valve, three floors normally open solenoid valve, four floors normally open solenoid valve, five floors normally open solenoid valve, six floors normally open solenoid valve all are in the outage on-state.

3. The water and fertilizer integrated intelligent irrigation control method suitable for rack type cultivation according to claim 1, wherein support rollers are arranged at the bottom of the support frame, the number of arranged layers of cultivation media is more than or equal to 2, the number of liquid storage tanks is more than or equal to 2, the number of arranged temperature and humidity sensors on each layer of cultivation media is more than or equal to 2, and the number of arranged liquid level sensors in the water and fertilizer integrated tank and the liquid storage tanks is more than or equal to 1; the pulley device is arranged on a beam in the vegetable greenhouse, and the rotation centers of the pulleys are positioned in the same horizontal plane.

4. The water and fertilizer integrated intelligent irrigation control method suitable for rack cultivation according to claim 1, wherein a supporting plate is arranged at the top end of the electric push rod device, and a weighing sensor is arranged between the supporting plate and the liquid storage tank.

5. A water and fertilizer integrated intelligent irrigation control method suitable for rack cultivation according to claim 1, wherein each normally open solenoid valve is in a normally open state when power is lost, and the power is in a normal state, and each normally closed solenoid valve is in a normally closed state when power is lost, and the power is in a normal state.

6. The integrated intelligent irrigation control method for liquid manure suitable for rack cultivation as claimed in claim 1, wherein two ends of the cable are respectively provided with a slip stopper to limit the relative position of the liquid storage tank in the vertical direction, the lower ends of the liquid storage tanks are respectively provided with an electric push rod device, and the controller controls the electric push rod device to lift up and down for supporting and limiting the liquid storage tanks.

7. The intelligent irrigation control method for integrating water and fertilizer suitable for rack cultivation as claimed in claim 1, wherein the position of the water and fertilizer integration tank is higher than the highest position reached by the liquid storage tank, the highest position reached by the liquid storage tank is higher than the upper surface of the cultivation substrate on which six layers of clay pipes are arranged, the one layer of clay pipes is positioned at the bottommost layer of the support frame, the six layers of clay pipes are positioned at the highest layer of the support frame, the one layer of clay pipes and the six layers of clay pipes are arranged in sequence from low to high, the initial height of the first liquid storage tank is positioned between three layers and four layers, and the initial height of the second liquid storage tank is lower than one layer.

8. The water and fertilizer integrated intelligent irrigation control method suitable for rack cultivation according to claim 1, wherein the controller outputs a control command for normal-pressure or positive-pressure irrigation after optimization analysis is performed according to feedback data of each layer of temperature and humidity sensors, the second liquid level sensor, the third liquid level sensor, the first weighing sensor and the second weighing sensor, when the humidity of each layer of cultivation medium reaches a set median value, the controller sends a command to enable the first liquid storage tank and the second liquid storage tank to be restored to the initial heights, all the electromagnetic valves are restored to the normal state, and the irrigation system is restored to a negative-pressure irrigation state.

9. The water and fertilizer integrated intelligent irrigation control method suitable for rack type cultivation according to claim 1, wherein when the feedback numerical value of the second weighing sensor is larger than the feedback numerical value of the first weighing sensor, the controller gives an instruction according to a feedback difference value of the second weighing sensor and the first weighing sensor, the controller controls the second normally closed solenoid valve to be powered on and opened, the second liquid storage tank is filled with liquid until the weight of the second liquid storage tank is consistent with that of the first liquid storage tank, the controller gives an instruction to enable the second normally closed solenoid valve to be powered off and closed to stop filling the second liquid storage tank, at the moment, the controller gives an instruction to control the first electric push rod device and the second electric push rod device to operate, if the first electric push rod device descends, the second electric push rod device ascends, if the first electric push rod device ascends, the second electric push rod device descends, and the stroke amounts of the first electric push rod device and the second electric push rod device are equal;

on the contrary, if the weight of the second liquid storage tank is larger than that of the first liquid storage tank, the controller gives an instruction to enable the first normally closed solenoid valve to be powered on to open the first liquid storage tank for filling liquid, and the controller sends an instruction to enable the first normally closed solenoid valve to be powered off to close and stop filling liquid into the first liquid storage tank until the weight of the first liquid storage tank is consistent with that of the second liquid storage tank.

10. The water and fertilizer integrated intelligent irrigation control method suitable for rack type cultivation according to claim 1, wherein when the second liquid level sensor and the third liquid level sensor detect that the nutrient storage amount in the first liquid storage tank and the nutrient storage amount in the second liquid storage tank are small, the first normally closed solenoid valve and the second normally closed solenoid valve can be opened simultaneously to inject liquid into the liquid storage tanks, when one of the liquid level sensors detects that the capacity in the liquid storage tanks reaches an upper limit value, the corresponding solenoid valve is closed first to stop injecting liquid, and when the feedback values of the two weighing sensors are consistent, the other solenoid valve is closed to stop injecting liquid.

Technical Field

The invention relates to the technical field of cultivation irrigation, in particular to a water and fertilizer integrated intelligent irrigation control method suitable for rack cultivation.

Background

At present, greenhouse vegetable planting mostly adopts irrigation modes such as drip irrigation, spray irrigation and the like. The drip irrigation device has higher manufacturing cost, and the capillary drippers can be blocked due to the influence of the precipitation of impurities and mineral substances; the uniformity of drip irrigation is difficult to guarantee, salt accumulation can also be caused, and when drip irrigation is carried out on the culture substrate with high salt content or saline water is utilized for drip irrigation, salt can accumulate at the edge of a humid area, and salt damage is caused. The drawback of utilizing the sprinkling irrigation to irrigate from the plant top lies in that the moist leaf of vegetables can arouse the risk of plant disease, though the near miniature sprinkling irrigation system of leaving ground can carry the basal portion of plant with water, can reduce the risk of plant disease development, but this kind is limited from the near miniature sprinkling irrigation system quantity of ground, is difficult to realize even irrigation, except that the autogenous pressure sprinkling irrigation equipment, the sprinkling irrigation equipment all needs external energy supply in addition. How to solve the problem that the energy supply and the automatic water and fertilizer supply in the planting process become hot points.

The existing rack type cultivation, namely a multilayer cultivation mode can obviously improve the hierarchical structure inside the greenhouse and greatly improve the utilization rate of greenhouse space. Secondly, raise the distance between vegetables and the ground, can effectively avoid and reduce the emergence of vegetables plant diseases and insect pests, also provide certain condition for implementing the negative pressure water supply technique and arranging liquid manure integration intelligent irrigation equipment. The negative pressure irrigation technology is used as a novel water supply technology, the matrix potential of the culture medium is used as irrigation power, automatic water supply can be realized without external energy, the moisture condition of the culture medium is stably maintained, evaporation and moisture leakage among moisture plants can be effectively reduced, and the utilization efficiency of the vegetables on the moisture can be greatly improved. According to the invention, negative pressure irrigation and a water and fertilizer integration technology are combined, the utilization rate of the water and fertilizer is improved, the quality of vegetables is obviously improved, meanwhile, positive pressure irrigation can be implemented when set conditions are met, the set value of the matrix water content can be quickly reached to supplement the water required by the vegetables, and the uniform humidity of the root area of the vegetables is always kept due to the characteristic of uniform water outlet of the irrigator.

Disclosure of Invention

The invention aims to provide a water and fertilizer integrated intelligent irrigation control method suitable for rack type cultivation, so as to solve the problems in the background art.

The technical problem solved by the invention is realized by adopting the following technical scheme:

the invention comprises a multilayer planting frame part, an irrigation control part and a lifting control part, wherein the multilayer planting frame part comprises a support frame, a cultivation substrate and pottery clay pipes, the support frame is provided with the multilayer cultivation substrate, each layer of cultivation substrate is internally provided with the pottery clay pipe, the irrigation control part comprises a water and fertilizer integrated tank, a liquid storage tank, a temperature and humidity sensor, a controller, a multi-way pipe joint, a liquid level sensor, a normally open electromagnetic valve and a normally closed electromagnetic valve, the water and fertilizer integrated tank, the liquid storage tank, the electromagnetic valve, the multi-way pipe joint and the pottery clay pipes are connected through infusion pipelines, the controller receives signals of the temperature and humidity sensor and the liquid level sensor and controls the power on and off of the normally open electromagnetic valve and the normally closed electromagnetic valve, an outlet of the water and fertilizer integrated tank is respectively connected with inlets of a first normally closed electromagnetic valve and a second normally closed electromagnetic valve through the first multi-way pipe joint, an outlet of the first normally closed electromagnetic valve is connected with an inlet of the first liquid storage tank, the outlet of the first liquid storage tank is connected with the inlet of a first multi-way pipe joint, the outlets of four layers of normally open solenoid valves, five layers of normally open solenoid valves, six layers of normally open solenoid valves and three layers of normally closed solenoid valves are respectively connected with the outlet of the first multi-way pipe joint, the outlets of five layers of normally open solenoid valves are connected with five layers of argil pipes, the outlets of six layers of normally open solenoid valves are connected with six layers of argil pipes, the outlet of the first normally closed solenoid valve is connected with the inlet of the first multi-way pipe joint, the inlet of the first layer of normally open solenoid valve, the inlet of the second layer of normally open solenoid valve and the inlet of the third multi-way pipe joint are respectively connected with the outlet of the second multi-way pipe joint, the outlet of the first layer of normally open solenoid valve is connected with one layer of argil pipe, the outlet of the third layer of normally open solenoid valve is connected with the third multi-way pipe joint, the lifting control part comprises a pulley device, slip-stopping pieces, a supporting plate, a weighing sensor, an electric push rod device and a cable rope, wherein the cable rope penetrates through the pulley device, the two ends of the cable rope are respectively provided with the liquid storage tanks, the two ends of the cable rope are respectively provided with the slip-stopping pieces to limit the relative position of the liquid storage tanks in up-and-down operation, the lower ends of the liquid storage tanks are respectively provided with the electric push rod device, and a controller controls the lifting of the electric push rod device to support and limit the liquid storage tanks;

the second electric push rod device pushes the first liquid storage tank and the first electric push rod device pushes the second liquid storage tank to the initial height, the mooring rope is kept in a tensioning state, the controller respectively controls the first normally closed solenoid valve and the second normally closed solenoid valve to be powered on and opened, water and fertilizer nutrient liquid in the water and fertilizer integrated tank is respectively injected into the first liquid storage tank and the second liquid storage tank, when the second liquid level sensor and the third liquid level sensor respectively detect that the liquid level value reaches a set value, the controller respectively controls the first normally closed solenoid valve and the second normally closed solenoid valve to be powered off and stops conveying the water and fertilizer nutrient liquid to the first liquid storage tank and the second liquid storage tank to finish primary liquid injection, in the process, each normally open solenoid valve is in a power-off normally closed state, each normally closed solenoid valve is in a power-off normally closed state, and the water and fertilizer nutrient liquid in the first liquid storage tank is respectively conveyed to four layers of argil pipes in a negative pressure irrigation mode, Five layers of clay pipes and six layers of clay pipes, wherein water, fertilizer and nutrient liquid in the second liquid storage tank is respectively delivered to the first layer of clay pipes, the second layer of clay pipes and the third layer of clay pipes in a negative pressure irrigation mode, when a second liquid level sensor in the first liquid storage tank detects that the liquid level is lower than a set value, a controller controls a first normally closed solenoid valve to be powered on and opened, liquid is injected into the first liquid storage tank, when the liquid level is recovered to the set value, the controller controls the first normally closed solenoid valve to be powered off and stop the first liquid storage tank, the circulation is repeated, when a third liquid level sensor in the second liquid storage tank detects that the liquid level is lower than the set value, the controller controls the second normally closed solenoid valve to be powered on and opened, liquid is injected into the second liquid storage tank, when the liquid level is recovered to the set value, the controller controls the second solenoid valve to be powered off and stop the second liquid storage tank from being normally closed, the circulation is repeated, when the first liquid level sensor in the water and fertilizer integrated tank detects that the liquid level is lower than a set value, the controller gives an alarm to prompt a worker to add water and fertilizer nutrients in time, the situation that negative pressure irrigation cannot meet the growth requirements of vegetables can occur along with the growth of the vegetables and the change of climate, when the humidity of the culture medium is lower than a set lower limit value, the controller conducts normal pressure or positive pressure irrigation through controlling the switch of the electromagnetic valve and the height of the liquid storage tank, when the normal pressure or positive pressure irrigation reaches a set median value of the humidity of the culture medium, the controller switches the irrigation mode to a negative pressure or pause state through controlling the switch of the electromagnetic valve and the height of the liquid storage tank, due to the hysteresis effect of soil water absorption, the humidity of the culture medium approaches the upper limit value along with the further penetration of moisture after the median value is detected, and the first liquid storage tank and the second liquid storage tank can respectively conduct irrigation on one layer or two layers, The three-layer, four layers, five layers and six layers are irrigated under negative pressure, normal pressure or positive pressure, the first liquid storage tank can irrigate one layer, two layers and three layers under normal pressure or positive pressure while irrigating the four layers, five layers and six layers under negative pressure, the second liquid storage tank can irrigate four layers, five layers and six layers under negative pressure while irrigating one layer, two layers and three layers under normal pressure or positive pressure, the first liquid storage tank and the second liquid storage tank can be used alternately, and the specific control steps are as follows:

the first and second liquid storage tanks irrigate the first, second and third layers at normal pressure or positive pressure

When the humidity of the first, second and third layers of culture medium is lower than the set lower limit value, the first electric push rod device pushes the second liquid storage tank to move upwards

When the normal pressure or positive pressure irrigation is carried out on only one layer or one layer simultaneously, and the normal pressure or positive pressure irrigation is carried out on two layers, the controller does not need to carry out instruction control on one layer of normally-open electromagnetic valve or one layer of normally-open electromagnetic valve simultaneously, and the two layers of normally-open electromagnetic valves are all in the power-off normally-open state, and when the normal pressure or positive pressure irrigation is carried out on only three layers or two layers simultaneously, and three layers, the controller respectively carries out instruction control on one layer of normally-open electromagnetic valve, two layers of normally-open electromagnetic valve or one layer of normally-open electromagnetic valve independently, namely when the normal pressure or positive pressure irrigation is carried out on only three layers, the one layer of normally-open electromagnetic valve and the two layers of normally-open electromagnetic valve are in the power-on closed state, and when the normal pressure or positive pressure irrigation is carried out on two layers or three layers, the one layer of normally-open electromagnetic valve is in the power-on closed state, and during the normal pressure or positive pressure irrigation is carried out on two layers, and the third normally-open electromagnetic valve, The fourth normally closed solenoid valves are all in a power-off closing state;

second, first liquid storage tank irrigates four layers, five layers and six layers under normal pressure or positive pressure

When the humidity of four-layer, five-layer and six-layer cultivation media is lower than a set lower limit value, the second electric push rod device pushes the first liquid storage tank to perform normal-pressure or positive-pressure irrigation, if only four-layer or simultaneously four-layer or five-layer is performed with normal-pressure or positive-pressure irrigation, the controller does not need to perform instruction control on the four-layer normally open solenoid valve or simultaneously the four-layer normally open solenoid valve and the five-layer normally open solenoid valve, the four-layer normally open solenoid valve, the five-layer normally open solenoid valve and the six-layer normally open solenoid valve are in a power-off normally open state, if only six-layer or simultaneously five-layer and six-layer are performed with normal-pressure or positive-pressure irrigation, the controller respectively performs instruction control on the four-layer normally open solenoid valve, the five-layer normally open solenoid valve or independently the four-layer normally open solenoid valve, namely, the six-layer normally open solenoid valve, the five-layer normally open solenoid valve is in a power-on closed state, and the five-layer is in a power-on normally open solenoid valve, When the six layers of irrigation are irrigated under normal pressure or positive pressure, the four layers of normally open electromagnetic valves are in an electrified closed state, and in the process, the third normally closed electromagnetic valve and the fourth normally closed electromagnetic valve are in an electrified closed state;

the third and the second liquid storage tanks irrigate four layers, five layers and six layers under normal pressure or positive pressure

When the humidity of the four-layer, five-layer and six-layer cultivation media is lower than a set lower limit value, the first electric push rod device pushes the second liquid storage tank to perform normal-pressure or positive-pressure irrigation, if only four-layer or simultaneously four-layer or five-layer is performed with normal-pressure or positive-pressure irrigation, the controller does not need to perform instruction control on the four-layer normally open solenoid valve or simultaneously the four-layer normally open solenoid valve and the five-layer normally open solenoid valve, the four-layer normally open solenoid valve, the five-layer normally open solenoid valve and the six-layer normally open solenoid valve are in a power-off normally open state, if only six-layer or simultaneously five-layer and six-layer are performed with normal-pressure or positive-pressure irrigation, the controller respectively performs instruction control on the four-layer normally open solenoid valve, the five-layer normally open solenoid valve or independently the four-layer normally open solenoid valve, namely, the six-layer, the four-layer normally open solenoid valve, the five-layer normally open solenoid valve is in a power-on closed state, and the five-layer is in a power-on normally open solenoid valve, When normal pressure or positive pressure irrigation is carried out on the six layers, the four layers of normally open electromagnetic valves are in an electrified closing state, in the process, the third normally closed electromagnetic valve is in an electrified closing state, the fourth normally closed electromagnetic valve is in an electrified opening state, and the first normally open electromagnetic valve is in an electrified closing state;

fourthly, the first liquid storage tank irrigates the first layer, the second layer and the third layer under normal pressure or positive pressure

When the humidity of the first layer, the second layer and the third layer of culture media is lower than a set lower limit value, the second electric push rod device pushes the first liquid storage tank to carry out normal-pressure or positive-pressure irrigation in an ascending mode, if only one layer or one layer and two layers are irrigated in normal-pressure or positive-pressure mode, the controller does not need to carry out command control on the one layer normally-open electromagnetic valve or the one layer normally-open electromagnetic valve and the two layers of normally-open electromagnetic valve simultaneously, the one layer normally-open electromagnetic valve, the two layers of normally-open electromagnetic valve and the three layers of normally-open electromagnetic valve are all in a power-off normally-open state, if only the three layers or two layers and three layers are irrigated in normal-pressure or positive-pressure mode simultaneously, the controller respectively carries out command control on the one layer normally-open electromagnetic valve, the two layers of normally-open electromagnetic valve or the one layer of normally-open electromagnetic valve independently, namely, when only the three layers are irrigated in normal-pressure or positive-pressure mode, the one layer normally-open electromagnetic valve, the two layers of normally-open electromagnetic valve and two layers of normally-open electromagnetic valve are in a power-on power-off state, and two layers of normally-open electromagnetic valve, When three layers of irrigation are irrigated under normal pressure or positive pressure, the normally open electromagnetic valve of one layer is in a power-on closed state, in the process, the third normally closed electromagnetic valve is in a power-on open state, the fourth normally closed electromagnetic valve is in a power-off closed state, and the first normally open electromagnetic valve is in a power-on closed state;

fifthly, the first liquid storage tank irrigates the first layer, the second layer, the third layer, the fourth layer, the fifth layer and the sixth layer under normal pressure or positive pressure

When one deck, two floors, three-layer, four floors, five floors, when six layers of culture medium's humidity all is less than the lower limit value of settlement, second electric putter device promotes first liquid storage pot and goes upward to carry out ordinary pressure or malleation and irrigate, at this in-process, fourth normally closed solenoid valve is in the outage off-state, first normally open solenoid valve is in the off-state that has got the electricity, third normally closed solenoid valve is in the on-state that has got the electricity, one deck normally open solenoid valve, two floors normally open solenoid valve, three floors normally open solenoid valve, four floors normally open solenoid valve, five floors normally open solenoid valve, six floors normally open solenoid valve all are in the outage on-state.

In the invention, the support rollers are arranged at the bottom of the support frame, so that the multi-layer planting frame can move conveniently, the number of layers of the culture medium is more than or equal to 2, and vegetables are planted on the culture medium.

In the invention, the number of the liquid storage tanks is more than or equal to 2, the number of the temperature and humidity sensors arranged on each layer of culture medium is more than or equal to 2, and the number of the liquid level sensors arranged in the liquid storage tanks and the water and fertilizer integrated irrigation are more than or equal to 1.

In the invention, the liquid of the water-fertilizer nutrient is stored in a water-fertilizer integrated tank, liquid level sensors are respectively arranged in the water-fertilizer integrated tank and a liquid storage tank, and a temperature and humidity sensor is arranged on each layer of culture medium.

In the invention, the pulley device is arranged on a beam in the vegetable greenhouse, and the rotation centers of the pulleys are positioned in the same horizontal plane.

In the invention, the top end of the electric push rod device is provided with a supporting plate, and a weighing sensor is arranged between the supporting plate and the liquid storage tank.

In the invention, each normally open electromagnetic valve is in a normally open state when power is lost, the power is in a normal state, and each normally closed electromagnetic valve is in a normally closed state when power is lost, and the power is in a normal state.

In the invention, the position of the water and fertilizer integrated tank is higher than the highest position of the liquid storage tank, the highest position of the liquid storage tank is higher than the upper surface of the culture substrate with six layers of argil pipes, the one layer of argil pipe is positioned at the bottommost layer of the support frame, the six layers of argil pipes are positioned at the highest layer of the support frame, the one layer of argil pipe and the six layers of argil pipe are sequentially arranged from low to high, the initial height of the first liquid storage tank is positioned between the three layers and the four layers, and the initial height of the second liquid storage tank is lower than that of the first liquid storage tank.

When the normal pressure or positive pressure irrigation is carried out on each layer, when the humidity of the cultivation substrate of the corresponding layer reaches a set median, the electromagnetic valve of the corresponding layer can be closed, for the selection of various normal pressure and positive pressure irrigation modes, the controller carries out optimization analysis according to feedback data of the temperature and humidity sensors, the second liquid level sensor, the third liquid level sensor, the first weighing sensor and the second weighing sensor of each layer and then outputs a control instruction to carry out normal pressure or positive pressure irrigation, when the humidity of the cultivation substrate of each layer reaches the set median, the controller sends an instruction to enable the first liquid storage tank and the second liquid storage tank to be restored to the initial height, all the electromagnetic valves are restored to the normal state, and then the irrigation system is restored to the negative pressure irrigation state, and the negative pressure irrigation is a main irrigation mode.

In the invention, the height of the first liquid storage tank and the height of the second liquid storage tank need to be adjusted for negative pressure, normal pressure or positive pressure irrigation, when the weight of the first liquid storage tank is larger than that of the second liquid storage tank, the feedback numerical value of the second weighing sensor is larger than that of the first weighing sensor, at the moment, the controller gives an instruction according to the feedback difference value of the first liquid storage tank and the second weighing sensor, the second normally closed electromagnetic valve is powered on and opened, the second liquid storage tank is filled with liquid until the weight of the second liquid storage tank is consistent with that of the first liquid storage tank, the controller sends an instruction to enable the second normally closed electromagnetic valve to be powered off and stop filling liquid into the second liquid storage tank, at the moment, the controller sends an instruction to control the first electric push rod device and the second electric push rod device to operate, if the first electric push rod device descends, the second electric push rod device ascends, if the first electric push rod device ascends, the second electric push rod device descends, and the stroke quantities of the two are equal;

on the contrary, if the weight of the second liquid storage tank is larger than that of the first liquid storage tank, the controller gives an instruction to enable the first normally closed solenoid valve to be powered on to open the first liquid storage tank for filling liquid, and the controller sends an instruction to enable the first normally closed solenoid valve to be powered off to close and stop filling liquid into the first liquid storage tank until the weight of the first liquid storage tank is consistent with that of the second liquid storage tank.

According to the invention, with the progress of irrigation, nutrients in the first liquid storage tank and the second liquid storage tank are consumed, when the weights of the first liquid storage tank and the second liquid storage tank are inconsistent and the first liquid storage tank and the second liquid storage tank need to move up and down, the nutrients are supplemented according to the control method, and the up-and-down operation is controlled after the weights are consistent;

when the second liquid level sensor and the third liquid level sensor respectively detect that the nutrient storage space in the first liquid storage tank and the second liquid storage tank is less, the first normally closed electromagnetic valve and the second normally closed electromagnetic valve can be opened simultaneously to inject liquid into the liquid storage tanks respectively, when one of the liquid level sensors detects that the capacity in the liquid storage tanks reaches an upper limit value, the corresponding electromagnetic valve is closed firstly to stop injecting the liquid, and when the feedback numerical values of the two weighing sensors are consistent, the other electromagnetic valve is closed again to stop injecting the liquid.

Has the advantages that: the invention combines the negative pressure water supply technology with the actual production, and forms the water and fertilizer integrated intelligent irrigation control method suitable for rack type cultivation based on the novel irrigation technology of negative pressure irrigation, thereby better saving water and fertilizer and external energy; secondly, the moisture content change of each layer of matrix can be accurately monitored and controlled, and the root fertilization and irrigation can be accurately controlled; the adaptability is strong, the occupied space area is small, and the requirements of different vegetables or the same vegetable on water and fertilizer requirements in different growth periods can be met on the same multilayer planting frame; the automatic greenhouse vegetable cultivation device has the advantages of high automation degree, environmental protection, low energy consumption, simple and convenient operation, and can be widely applied to the soil-free or soilless rack type cultivation of the existing greenhouse vegetables.

The system is suitable for long-term high-efficiency intelligent irrigation, and double-line multi-mode operation is adopted for positive and negative pressure irrigation of each layer, so that untimely supply caused by local faults of pipelines or control systems can be effectively prevented, the growth of vegetables is effectively prevented from being influenced, and the maintenance cost of the system can be greatly reduced; in a normal state taking negative pressure irrigation as a leading factor, all the electromagnetic valves are in a power-off state, and only in short-time normal pressure or positive pressure irrigation, the electromagnetic valves are powered, so that the control energy consumption of the system is effectively reduced; the pulley device is adopted, the liquid storage tanks are arranged at the two ends of the mooring rope, the equal lever principle of the pulley device is utilized, the weight of the liquid storage tanks at the two ends is controlled to be consistent, the mutual conversion of potential energy can be realized by the dead weight of the liquid storage tanks, the electric push rod device can easily change the position height of the liquid storage tanks at the two ends of the mooring rope only by overcoming the friction resistance of the system, and the energy consumption caused by the change of the height of the liquid storage tanks is greatly reduced; the whole set of irrigation system has high intelligent degree, greatly increases the yield of the precise supply of water and fertilizer required by the growth of vegetables, and reduces the consumption of water resources, electric energy and human resources to the maximum extent.

Drawings

FIG. 1 is a schematic diagram of initial position connection according to a preferred embodiment of the present invention.

FIG. 2 is a schematic diagram of positive and negative pressure irrigation according to the preferred embodiment of the present invention.

FIG. 3 is a schematic view of the connection of the irrigation control assembly according to the preferred embodiment of the invention.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.

Referring to fig. 1-3, the water and fertilizer integrated intelligent irrigation control method suitable for rack cultivation adopts a positive and negative pressure alternative irrigation control device to implement water and fertilizer integrated intelligent irrigation, and comprises a multilayer planting frame part A, an irrigation control part B and a lifting control part C, wherein the multilayer planting frame part A comprises a first argil pipe A1, a second argil pipe A2, a third argil pipe A3, a fourth argil pipe A4, a fifth argil pipe A5, a sixth argil pipe A6, a cultivation matrix A7, a bracket roller A8, a support frame A9 and a vegetable A10, and the irrigation control part B comprises a first normally open solenoid valve B1, a second normally open solenoid valve B2, a third normally open solenoid valve B3, a fourth normally open solenoid valve B4, a fifth normally open solenoid valve B5, a sixth normally open solenoid valve B6, a third normally closed solenoid valve B7, a first normally open solenoid valve B8, The lifting control part C comprises a first pulley device C1, a second pulley device C2, a first sliding stopping piece C3, a second sliding stopping piece C4, a first supporting plate C5, a second supporting plate C6, a first weighing sensor C7, a second weighing sensor C7, a first electric push rod device C7, a second electric push rod device C7 and a second electric push rod device C7, wherein the first sliding stopping piece C7 is connected with the lifting control part C through a lifting control part C, and the lifting control part C comprises a first lifting control part C17, a second lifting control part C2, a first sliding stopping piece C3, a second sliding stopping piece C4, a first supporting plate C5, a second supporting plate C6, a second lifting control part C4684, a first multi-way pipe joint B12, a second multi-way pipe joint B595, a second multi-way pipe joint B14, a fourth multi-way pipe joint B15, a controller B16, a temperature and humidity sensor B17.

In the embodiment, a support roller A8 is arranged at the bottom of a support frame A9 to facilitate movement of a multi-layer planting frame part A, six planting layers are arranged on the support frame A9, a planting substrate A7 is arranged on each planting layer, a first layer of clay pipe A1, a second layer of clay pipe A2, a third layer of clay pipe A3, a fourth layer of clay pipe A4, a fifth layer of clay pipe A5 and a sixth layer of clay pipe A6 are respectively arranged in the planting substrates A7 of each layer and used for conveying water and fertilizer liquid to the planting substrate A7, a humidity sensor B17 is arranged on each layer of planting substrate A7 and used for detecting the water content and the temperature of the planting substrate A7 and feeding back the data to a controller B16, vegetables A10 are planted on the planting substrates A7, and grow by absorbing the water, fertilizer liquid in the planting substrates A7.

In this embodiment, the liquid of the water and fertilizer nutrients is stored in a water and fertilizer integrated tank B18, a first liquid level sensor B21 is arranged in the water and fertilizer integrated tank B18, an outlet of the water and fertilizer integrated tank B18 is connected with an inlet of a first multi-way pipe joint B12 through an infusion pipe, inlets of a first normally closed solenoid valve B10 and a second normally closed solenoid valve B11 are respectively connected with an outlet of the first multi-way pipe joint B12 through infusion pipes, an outlet of the first normally closed solenoid valve B10 is connected with an inlet of a first liquid storage tank B19 through an infusion pipe, an outlet of the second normally closed solenoid valve B11 is connected with an inlet of a second liquid storage tank B20 through an infusion pipe, an outlet of the first liquid storage tank B19 is connected with an inlet of the second multi-way pipe joint B13 through an infusion pipe, inlets of a fourth layer normally open solenoid valve B4, a fifth layer normally open solenoid valve B5, a sixth layer normally open solenoid valve B6 and a third layer B7 are respectively connected with an outlet of the second multi-way pipe joint B13 through an infusion pipe, the outlet of the four-layer normally open electromagnetic valve B4 is connected with the four-layer argil pipe A4 through a transfusion pipeline, the outlet of the five-layer normally open electromagnetic valve B5 is connected with the five-layer argil pipe A5 through a transfusion pipeline, the outlet of the six-layer normally open electromagnetic valve B6 is connected with the six-layer argil pipe A6 through a transfusion pipeline, the outlet of the third normally closed electromagnetic valve B7 is connected with the inlet of the third multi-way pipe joint B14 through a transfusion pipeline, the inlet of the one-layer normally open electromagnetic valve B1, the outlet of the two-layer normally open electromagnetic valve B2 and the inlet of the three-layer argil normally open electromagnetic valve B3 are respectively connected with the outlet of the third multi-way pipe joint B14 through a transfusion pipeline 14, the outlet of the one-layer normally open electromagnetic valve B1 is connected with the one-layer argil pipe A1 through a transfusion pipeline, the outlet of the two-layer argil electromagnetic valve B2 is connected with the two-layer argil pipe A2 through a transfusion pipeline, the outlet of the three-layer normally open electromagnetic valve B3 is connected with the three-layer argil pipe A3 through a transfusion pipeline, the inlet of the first normally open electromagnetic valve B8 and the fourth normally closed electromagnetic valve B9 is respectively connected with the outlet of the second liquid storage tank B20 through a transfusion pipeline, the outlet of the fourth normally closed solenoid valve B9 is connected with the inlet of the second multi-way pipe joint B13 through a transfusion pipeline, the outlet of the first normally open solenoid valve B8 is connected with the inlet of the fourth multi-way pipe joint B15 through a transfusion pipeline, the outlet of the fourth multi-way pipe joint B15 is connected with the inlets of the one-layer normally open solenoid valve B1, the two-layer normally open solenoid valve B2 and the three-layer normally open solenoid valve B3 through transfusion pipelines respectively, a second liquid level sensor B22 is arranged in the first liquid storage tank B19, and a third liquid level sensor B23 is arranged in the second liquid storage tank B20.

In this embodiment, a first pulley device C1 and a second pulley device C2 are respectively disposed on a cross beam in a vegetable greenhouse, and rotation centers of pulleys are in the same horizontal plane, a cable C11 simultaneously passes through the first pulley device C1 and the second pulley device C2, one end of the cable C11 is fixedly connected to a first tank B19, the other end of the cable C11 is fixedly connected to a second tank B20, a first sliding stopper C3 is disposed at an end of the cable C11 close to the second tank B20, a second sliding stopper C4 is disposed at an end of the cable C11 close to the first tank B19, the first sliding stopper C3 and the second sliding stopper C4 are used for limiting the cable C11 to pull a relative position where the first tank B19 and the second tank B20 move up and down, a second electric push rod device C10 is disposed at a lower end of the first tank B19, the second electric push rod device C10 is used for supporting the first tank B19 and a second tank C10 supporting plate 6, be located and be provided with second weighing sensor C8 between second layer board C6 and the first liquid storage pot B19, the lower extreme of second liquid storage pot B20 is provided with first electric putter device C9, first electric putter device C9 is used for support and spacing to second liquid storage pot B20, the top of first electric putter device C9 is provided with first layer board C5, be located and be provided with first weighing sensor C7 between first layer board C5 and the second liquid storage pot B20.

In this embodiment, the first layer of normally open solenoid valve B1, the second layer of normally open solenoid valve B2, the third layer of normally open solenoid valve B3, the fourth layer of normally open solenoid valve B4, the fifth layer of normally open solenoid valve B5, the sixth layer of normally open solenoid valve B6, the first normally open solenoid valve B8 are normally open when power is lost, and the power is lost and is normal, the third normally closed solenoid valve B7, the fourth normally closed solenoid valve B9, the first normally closed solenoid valve B10, and the second normally closed solenoid valve B11 are normally closed when power is lost, and the power is lost and is normal, the position of the water and fertilizer integrated tank B18 is higher than the highest position that can be reached by the first liquid storage tank B19 and the second liquid storage tank B20, the highest position that can be reached by the first liquid storage tank B19 and the second liquid storage tank B20 is higher than the upper surface of the cultivation substrate a7 that the sixth layer of argil pipe a6, the controller B16 receives the temperature and humidity sensor B17, the first weighing sensor C2, the second weighing sensor C56, the second liquid level sensor B82 21, and the second liquid level sensor B8427 in real time, The detection data of the third liquid level sensor B23, the controller B16 can control the power-on and power-off of each electromagnetic valve, the controller B16 can control the lifting of the first electric push rod device C9 and the second electric push rod device C10, the first layer of clay pipes A1 are positioned at the bottommost layer of the supporting frame A9, the six layers of clay pipes A6 are positioned at the highest layer of the supporting frame A9, the first layer of clay pipes A1 and the six layers of clay pipes A6 are sequentially arranged from low to high, the initial height of the first liquid storage tank B19 is positioned between the three layers and the four layers, and the initial height of the second liquid storage tank B20 is lower than one layer.

In this embodiment, the second electric putter device C10 pushes the first liquid storage tank B19 and the first electric putter device C9 pushes the second liquid storage tank B20 to the initial height, and the cable C11 is kept in a tensioned state, the controller B16 controls the first normally closed solenoid valve B10 and the second normally closed solenoid valve B11 to be electrically opened, the liquid fertilizer nutrient in the liquid fertilizer integrated tank B18 is respectively injected into the first liquid storage tank B19 and the second liquid storage tank B20 through the infusion pipes, when the second liquid level sensor B22 and the third liquid level sensor B23 respectively detect the liquid level value to a set value, the controller B16 controls the first normally closed solenoid valve B10 and the second normally closed solenoid valve B11 to be electrically closed, the liquid fertilizer nutrient delivery to the first liquid storage tank B19 and the second liquid storage tank B20 is stopped, and the first normally open solenoid valve B1, the second normally open solenoid valve B2, the third normally open solenoid valve B3, the fourth normally open solenoid valve B4, the first liquid fertilizer 46b 5 and the fifth liquid nutrient liquid fertilizer liquid level sensor B23 are respectively detected to be electrically closed to a set value, When a second liquid level sensor B22 in the first liquid storage tank B19 detects that the liquid level is lower than a set value, the controller B16 controls the first normally closed solenoid valve B10 to be electrically opened, the first liquid storage tank B16 controls the first liquid storage tank B10 to be electrically closed until the liquid level is restored to the set value, stopping filling liquid into the first liquid storage tank B19, repeating the cycle, when a third liquid level sensor B23 in a second liquid storage tank B20 detects that the liquid level is lower than a set value, controlling a second normally closed solenoid valve B11 to be powered on and opened by a controller B16, filling liquid into the second liquid storage tank B20 until the liquid level is recovered to the set value, controlling a second normally closed solenoid valve B11 to be powered off and stopping filling liquid into the second liquid storage tank B20 by a controller B16, when the first liquid level sensor B21 in a water and fertilizer integrated tank B18 detects that the liquid level is lower than the set value, sending an alarm by the controller B16 to prompt a worker to add water and fertilizer nutrients in time, along with the growth and climate change of the vegetables A10, the negative pressure irrigation can not meet the growth requirement of the vegetables A10, and when the humidity of the culture substrate A7 is lower than a set lower limit value, controlling the on-off and on of the solenoid valve by the controller B16 to carry out normal pressure or positive pressure irrigation by controlling the height of the liquid storage tanks, the first liquid storage tank B19 and the second liquid storage tank B20 can respectively carry out negative pressure, normal pressure or positive pressure irrigation on one layer, two layers, three layers, four layers, five layers and six layers, the first liquid storage tank B19 can carry out the negative pressure irrigation on the four layers, five layers and six layers and simultaneously carry out the normal pressure or positive pressure irrigation on the one layer, two layers and three layers, the second liquid storage tank B20 can carry out the negative pressure irrigation on the four layers, five layers and six layers and simultaneously carry out the normal pressure or positive pressure irrigation on the one layer, two layers and three layers, the first liquid storage tank B19 and the second liquid storage tank B20 can be alternately used, and the specific control steps are as follows:

the first and second liquid storage tanks B20 irrigate the first, second and third layers under normal pressure or positive pressure

When the humidity of the first, second and third layers of culture medium A7 is lower than the set lower limit value, the first electric push rod device C9 pushes the second liquid storage tank

B20 goes upward to perform normal pressure or positive pressure irrigation, if only one layer or two layers are subjected to normal pressure or positive pressure irrigation at the same time, the controller B16 does not need to command the one-layer normally open solenoid valve B1 or the one-layer normally open solenoid valve B1 and the two-layer normally open solenoid valve B2, the one-layer normally open solenoid valve B1, the two-layer normally open solenoid valve B2 and the three-layer normally open solenoid valve B3 are all in a power-off normally open state, if only three layers or two layers and three layers are subjected to normal pressure or positive pressure irrigation at the same time, the controller B16 respectively commands the one-layer normally open solenoid valve B1, the two-layer normally open solenoid valve B2 or the one-layer normally open solenoid valve B1, namely, the one-layer normally open solenoid valve B1 and the two-layer normally open solenoid valve B2 are in a power-on closed state, and when two layers and three layers are subjected to normal pressure or positive pressure irrigation, the one-layer normally open solenoid valve B1 is in a power-on closed state, in the process, the third normally closed electromagnetic valve B7 and the fourth normally closed electromagnetic valve B9 are in a power-off closing state;

the second and the first liquid storage tanks B19 irrigate four layers, five layers and six layers of plants under normal pressure or positive pressure

When the humidity of the four-layer, five-layer and six-layer cultivation substrates A7 is lower than a set lower limit value, the second electric push rod device C10 pushes the first liquid storage tank B19 to go upward for normal-pressure or positive-pressure irrigation, if only four-layer or simultaneous four-layer or five-layer normal-pressure irrigation is carried out, the controller B16 does not need to command and control the four-layer normally-open solenoid valve B4 or simultaneous four-layer normally-open solenoid valve B4 and five-layer normally-open solenoid valve B5, the four-layer normally-open solenoid valve B4, the five-layer normally-open solenoid valve B5 and the six-layer normally-open solenoid valve B6 are in a power-off normally-open state, if only six-layer or simultaneous five-layer or six-layer normal-pressure irrigation is carried out, the controller B16 respectively commands and controls the four-layer normally-open solenoid valve B4 and the five-layer normally-open solenoid valve B5 or the four-layer normally-open solenoid valve B4, namely, the six-layer normally-open solenoid valve B4 and the five-layer normally-open solenoid valve B5 are in a power-on normally-closed state, when the five-layer and six-layer irrigation is carried out under normal pressure or positive pressure, the four-layer normally-open electromagnetic valve B4 is in an electrified closed state, and in the process, the third normally-closed electromagnetic valve B7 and the fourth normally-closed electromagnetic valve B9 are in an electrified closed state;

the third and the second liquid storage tanks B20 irrigate four layers, five layers and six layers under normal pressure or positive pressure

When the humidity of the four-layer, five-layer and six-layer cultivation substrates A7 is lower than a set lower limit value, the first electric push rod device C9 pushes the second liquid storage tank B20 to go upward for normal-pressure or positive-pressure irrigation, if only four-layer or simultaneous four-layer or five-layer normal-pressure irrigation is carried out, the controller B16 does not need to command and control the four-layer normally-open solenoid valve B4 or simultaneous four-layer normally-open solenoid valve B4 and five-layer normally-open solenoid valve B5, the four-layer normally-open solenoid valve B4, the five-layer normally-open solenoid valve B5 and the six-layer normally-open solenoid valve B6 are in a power-off normally-open state, if only six-layer or simultaneous five-layer or six-layer normal-pressure irrigation is carried out, the controller B16 respectively commands and controls the four-layer normally-open solenoid valve B4 and the five-layer normally-open solenoid valve B5 or the four-layer normally-open solenoid valve B4, namely, the six-layer normally-open solenoid valve B4 and the five-layer normally-open solenoid valve B5 are in a power-on normally-closed state, when the five-layer and six-layer irrigation is carried out under normal pressure or positive pressure, the four-layer normally-open electromagnetic valve B4 is in an electrified closing state, in the process, the third normally-closed electromagnetic valve B7 is in an electrified closing state, the fourth normally-closed electromagnetic valve B9 is in an electrified opening state, and the first normally-open electromagnetic valve B8 is in an electrified closing state;

fourthly, the first liquid storage tank B19 irrigates the first layer, the second layer and the third layer under normal pressure or positive pressure

When the humidity of the first-layer, second-layer and third-layer cultivation substrates A7 is lower than a set lower limit value, the second electric push rod device C10 pushes the first liquid storage tank B19 to go upward for normal-pressure or positive-pressure irrigation, if only one layer or both layers are irrigated at normal pressure or positive pressure, the controller B16 does not need to command and control the one-layer normally-open electromagnetic valve B1 or both the one-layer normally-open electromagnetic valve B1 and the two-layer normally-open electromagnetic valve B2, the one-layer normally-open electromagnetic valve B1, the two-layer normally-open electromagnetic valve B2 and the three-layer normally-open electromagnetic valve B3 are in a power-off normally-open state, if only three layers or both layers are irrigated at normal pressure or positive pressure, the controller B16 respectively commands and controls the one-layer normally-open electromagnetic valve B1, the two-layer normally-open electromagnetic valve B2 or only one-layer normally-open electromagnetic valve B1, namely only three layers are irrigated at normal pressure or positive pressure, the one-layer normally-open electromagnetic valve B1 and the two-layer normally-open electromagnetic valve B2 are in a power-off state, when the second-layer and the third-layer irrigation are irrigated under normal pressure or positive pressure, the normally open electromagnetic valve B1 on one layer is in an electrified closed state, in the process, the third normally closed electromagnetic valve B7 is in an electrified open state, the fourth normally closed electromagnetic valve B9 is in an electrified closed state, and the first normally open electromagnetic valve B8 is in an electrified closed state;

fifthly, the first liquid storage tank B19 irrigates the first layer, the second layer, the third layer, the fourth layer, the fifth layer and the sixth layer under normal pressure or positive pressure

When the humidity of the first-layer, second-layer, third-layer, fourth-layer, fifth-layer and sixth-layer cultivation substrates A7 is lower than a set lower limit value, the second electric push rod device C10 pushes the first liquid storage tank B19 to ascend to perform normal-pressure or positive-pressure irrigation, in the process, the fourth normally closed electromagnetic valve B9 is in a power-off closing state, the first normally open electromagnetic valve B8 is in a power-on closing state, the third normally closed electromagnetic valve B7 is in a power-on opening state, and the first-layer normally open electromagnetic valve B1, the second-layer normally open electromagnetic valve B2, the third-layer normally open electromagnetic valve B3, the fourth-layer normally open electromagnetic valve B4, the fifth-layer normally open electromagnetic valve B5 and the sixth-layer normally open electromagnetic valve B6 are in a power-off normally open state;

when normal pressure or positive pressure irrigation is carried out on each layer, when the humidity of the cultivation substrate A7 of the corresponding layer reaches a set median, the electromagnetic valve of the corresponding layer can be closed, for the selection of various normal pressure and positive pressure irrigation modes, the controller B16 outputs a control instruction to carry out normal pressure or positive pressure irrigation after carrying out optimization analysis according to the feedback data of the temperature and humidity sensor B17, the second liquid level sensor B22, the third liquid level sensor B23, the first weighing sensor C7 and the second weighing sensor C8, and when the humidity of the cultivation substrate A7 of each layer reaches the set median, the controller B16 sends an instruction to enable the first liquid storage tank B19 and the second liquid storage tank B20 to be restored to the initial height, all the electromagnetic valves are also restored to the normal state, and the irrigation system is restored to the negative pressure irrigation state.

In this embodiment, the heights of the first liquid storage tank B19 and the second liquid storage tank B20 need to be adjusted for negative pressure, normal pressure or positive pressure irrigation, when the weight of the first liquid storage tank B19 is greater than the weight of the second liquid storage tank B20, the feedback value of the second weighing sensor C8 is greater than the feedback value of the first weighing sensor C7, at this time, the controller B16 gives a command according to the feedback difference between the first liquid storage tank B19 and the second liquid storage tank B11, the second normally closed electromagnetic valve B11 is powered on to start liquid injection for the second liquid storage tank B20 until the weight of the second liquid storage tank B20 is consistent with the weight of the first liquid storage tank B19, the controller B16 gives a command to power off the second normally closed electromagnetic valve B11 to stop liquid injection for the second liquid storage tank B20, at this time, the controller B16 gives a command to control the first electric push rod device C9 and the second electric push rod device C10 to operate, if the first electric push rod device C9 moves downward, the second electric push rod device C10 moves upward, if the first electric push rod device C9 moves upward, the second electric push rod device C10 goes down and the stroke amounts of the two are equal;

on the contrary, if the weight of the second liquid storage tank B20 is greater than that of the first liquid storage tank B19, the controller B16 gives a command to enable the first normally closed solenoid valve B10 to be powered on to fill the first liquid storage tank B19 until the weight of the first liquid storage tank B19 is consistent with that of the second liquid storage tank B20, and the controller B16 gives a command to enable the first normally closed solenoid valve B10 to be powered off to stop filling the first liquid storage tank B19;

with the irrigation, the nutrients in the first liquid storage tank B19 and the second liquid storage tank B20 are consumed, when the weights of the two tanks are not consistent and the two tanks need to move up and down, the nutrients are supplemented according to the control method, and the tanks are controlled to move up and down after the weights of the two tanks are consistent;

when second level sensor B22, third level sensor B23 detected respectively that the nourishment memory space in first liquid storage pot B19 and the second liquid storage pot B20 is less, can open first normally closed solenoid valve B10 and second normally closed solenoid valve B11 respectively and annotate it simultaneously, when one of them liquid level sensor detected the capacity in the liquid storage pot and reached the upper limit value, close corresponding solenoid valve earlier and stop annotating liquid, treat that 2 weighing sensor feedback numerical values are unanimous, close another solenoid valve and stop annotating liquid.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.