阅读说明：本技术 一种降雨模拟系统及方法 (Rainfall simulation system and method ) 是由 杨长卫 陈桂龙 童心豪 瞿立明 王栋 刘阳 于 2020-11-18 设计创作，主要内容包括：本发明公开了一种降雨模拟系统及方法,该系统包括：降雨装置,所述降雨装置包括分区降雨箱、止回阀、分向阀、降雨针头；供水装置,所述供水装置包括进水管路、水泵、供水管路、流量控制阀；控制装置,所述控制装置用于控制所述供水装置和所述降雨装置。本发明可自动控制降雨针头的开合及分区降雨箱分区独立降雨功能,能准确地同时模拟多区域稳定变雨强均匀降雨的试验条件,为岩土工程和环境工程相关研究提供可靠的试验参数。(The invention discloses a rainfall simulation system and a method, wherein the system comprises: the rainfall device comprises a subarea rainfall box, a check valve, a diversion valve and a rainfall needle head; the water supply device comprises a water inlet pipeline, a water pump, a water supply pipeline and a flow control valve; a control device for controlling the water supply device and the rainfall device. The invention can automatically control the opening and closing of the rainfall needle head and the independent rainfall function of the subarea rainfall box, can accurately and simultaneously simulate the test conditions of stable rainfall intensity changing and uniform rainfall of multiple areas, and provides reliable test parameters for relevant research of geotechnical engineering and environmental engineering.)

1. A rainfall simulation system is characterized by comprising,

the rainfall device comprises a subarea rainfall box, a check valve, a diversion valve and a rainfall needle head; the check valve is arranged at the bottom of the subarea rain-falling box, a first water outlet of the diverter valve is connected with the rain-falling needle head, and a second water outlet of the diverter valve is connected with the check valve;

the water supply device comprises a water inlet pipeline, a water pump, a water supply pipeline and a flow control valve;

one end of the water inlet pipeline is connected with a water source, the other end of the water inlet pipeline is connected with an inlet of the water pump, and an outlet of the water pump is connected with an inlet of the water supply pipeline;

the water supply pipeline comprises a primary water supply pipeline, at least two first secondary water supply pipelines, at least two second secondary water supply pipelines and at least two tertiary water supply pipelines; the outlet of the water pump is connected with the inlet of the first-stage water supply pipeline, and the outlet of the first-stage water supply pipeline is connected with the inlets of the first second-stage water supply pipeline and the second-stage water supply pipeline; the first secondary water supply pipeline is connected with a water inlet at the top of the subarea rain-reducing box, and the second secondary water supply pipeline is connected with a tertiary water supply pipeline at the bottom of the subarea rain-reducing box;

the flow control valves comprise at least two first flow control valves and at least two second flow control valves, the first flow control valves are arranged on the first secondary water supply pipeline and used for controlling the on-off of the first secondary water supply pipeline, and the second flow control valves are arranged on the second secondary water supply pipeline and used for controlling the on-off of the third secondary water supply pipeline; the three-stage water supply pipeline is connected with a water inlet of the branch valve;

a control device for controlling the water supply device and the rainfall device.

2. A rainfall simulation system according to claim 1,

the water inlet pipeline is provided with a water tank, a water inlet valve and a first flow meter, the water tank is used for storing water of the water source, the water inlet valve is used for controlling a switch of the water inlet management, and the first flow meter is used for monitoring the total flow and the instantaneous flow of the water inlet pipeline; the water pump is a variable frequency pump.

3. A rainfall simulation system according to claim 2,

a transverse partition plate and/or a longitudinal partition plate are/is arranged in the subarea rainfall box and used for the subarea of the subarea rainfall box;

the first water outlet of the diverter valve is connected with the rainfall needle through a needle conversion joint;

the check valve is arranged in an installation hole formed in the bottom of the subarea rain-falling box, and the aperture of the installation hole is matched with the outer diameter of the check valve;

the subregion raining drop case still is provided with the drain line, be provided with second flowmeter and drain valve on the drain line.

4. A rainfall simulation system according to claim 3,

the subregion rainfall case is provided with 6 subregion, first second grade water supply pipe, second grade water supply pipe, first flow control valve and second flow control valve's quantity is 6.

5. The rainfall simulation system of claim 1, 2, 3 or 4, further comprising

The supporting device comprises a lifting supporting device and foundation bolts, the lifting supporting device is used for supporting the subarea rain-falling box and adjusting the height of the subarea rain-falling box, and the foundation bolts are used for fixing the lifting supporting device.

6. A rainfall simulation system according to claim 5,

the lifting support device is a hydraulic lifting support device.

7. The rainfall simulation system of claim 5, further comprising

The experimental device is arranged below the rainfall device and comprises a bearing platform, and the bearing platform is used for bearing rock and soil bodies to be tested.

8. A rainfall simulation method, comprising:

s1, arranging the rainfall simulation system according to claim 7;

s2, controlling the water supply device to supply water based on the set total water supply flow Q_{General assembly}And the actual water supply flow Q monitored by the first flowmeter_{Practice of}When the actual water supply flow rate Q_{Practice of}Total flow Q of theoretical water supply_{General assembly}When the water pump is not used, adjusting the water pump;

s3, judging the actual water supply flow Q_{Practice of}With a set total flow rate Q of water supply_{General assembly}When the rainfall intensity of the preset rainfall area of the partitioned rainfall box is the same as that of the preset rainfall area, controlling the opening degree of a first flow control valve corresponding to the preset rainfall area to rainfall;

and S4, closing the first flow control valve corresponding to the preset rainfall area, opening the second flow control valve and the drain valve, ending rainfall, closing the water pump, stopping water supply and discharging the residual water flow in the rainfall box.

9. A rainfall simulation method according to claim 8,

when the preset rainfall area of the subarea rainfall box is changed, controlling a first flow control valve corresponding to the changed preset rainfall area to be opened; and when the rainfall intensity of the preset rainfall area is changed, adjusting the opening degree of the first flow control valve corresponding to the preset rainfall area.

10. A rainfall simulation method according to claim 8, in particular,

opening a water inlet valve, a first flow control valve and a second flow control valve, closing a drain valve of the rainfall box, and debugging the sealing performance of the rainfall device;

opening a first flow control valve of a preset rainfall area, and closing first flow control valves of other areas; opening drain valves of the preset rainfall areas, closing second flow control valves of all areas, and making the preset rainfall areas ready for rainfall;

monitoring the actual total flow Q of water supply based on the specified total flow Q of water supply input at the program interface_{Fruit of Chinese wolfberry}Adjusting Q_{Fruit of Chinese wolfberry}Is consistent with Q;

monitoring the flow of a drainage pipeline in a preset rainfall area, closing a drainage valve and a second flow control valve after the drainage flow is consistent and stable with the inflow flow, and starting to simulate artificial rainfall;

changing the rainfall intensity once at preset time intervals, and drawing a rainfall intensity and rainfall curve of a preset rainfall area based on monitoring data;

repeating the steps until the rainfall of the preset rainfall area is finished, closing the first flow control valves and all the second flow control valves of the preset rainfall area, opening the first flow control valves of other areas, simulating artificial rainfall of other areas, and drawing rainfall intensity and rainfall curve of other areas based on the monitoring data;

opening a second flow control valve and stopping rainfall; and closing the first flow control valve and opening the drain valve to drain.

Technical Field

The invention relates to the technical field of engineering simulation, in particular to a rainfall simulation system and method.

Background

At present, because the nozzle type rainfall device has high automation degree and is easy to control, students mostly adopt the nozzle type rainfall device to research the slope stability under different rainfall conditions; the needle tube type artificial rainfall device is less in research and application because the theory is complex and is not easy to control, and the traditional needle tube type artificial rainfall device mainly has the following defects:

the traditional needle tube-shaped artificial rainfall device is connected with a rainfall box through a water supply pipe, rainfall is simulated in a mode that holes are formed in a bottom plate of the rainfall box and needles are installed, the automation degree of the mode is low, and the start and stop of artificial rainfall simulation cannot be effectively controlled, so that a rock-soil body test model is disturbed, and a test result is influenced.

The traditional needle tube type rainfall device control is a process of gradual change along with time because the needle can not be controlled to be opened and closed, and the rainfall intensity in the gradual change process is difficult to express and analyze by using a mathematical function, so that a great error exists in a test result.

Most of traditional needle tube type rainfall devices can only simulate rainfall in a single area or simulate the same rainfall intensity test in different areas, and the independent rainfall function of different rainfall intensities in different areas of the rainfall box cannot be realized.

Disclosure of Invention

To solve at least one of the above technical problems, embodiments of the present specification provide a rainfall simulation system and method.

In one aspect, a rainfall simulation system provided in an embodiment of the present specification includes:

the rainfall device comprises a subarea rainfall box, a check valve, a diversion valve and a rainfall needle head; the check valve is arranged at the bottom of the subarea rain-falling box, a first water outlet of the diverter valve is connected with the rain-falling needle head, and a second water outlet of the diverter valve is connected with the check valve;

the water supply device comprises a water inlet pipeline, a water pump, a water supply pipeline and a flow control valve;

one end of the water inlet pipeline is connected with a water source, the other end of the water inlet pipeline is connected with an inlet of the water pump, and an outlet of the water pump is connected with an inlet of the water supply pipeline;

the water supply pipeline comprises a primary water supply pipeline, at least two first secondary water supply pipelines, at least two second secondary water supply pipelines and at least two tertiary water supply pipelines; the outlet of the water pump is connected with the inlet of the first-stage water supply pipeline, and the outlet of the first-stage water supply pipeline is connected with the inlets of the first second-stage water supply pipeline and the second-stage water supply pipeline; the first secondary water supply pipeline is connected with a water inlet at the top of the subarea rain-reducing box, and the second secondary water supply pipeline is connected with a tertiary water supply pipeline at the bottom of the subarea rain-reducing box;

the flow control valves comprise at least two first flow control valves and at least two second flow control valves, the first flow control valves are arranged on the first secondary water supply pipeline and used for controlling the on-off of the first secondary water supply pipeline, and the second flow control valves are arranged on the second secondary water supply pipeline and used for controlling the on-off of the third secondary water supply pipeline; the three-stage water supply pipeline is connected with a water inlet of the branch valve;

a control device for controlling the water supply device and the rainfall device.

In another aspect, a rainfall simulation method provided in an embodiment of the present specification includes:

s1, arranging the rainfall simulation system according to claim 7;

s2, controlling the water supply device to supply water based on the set total water supply flow Q_{General assembly}And the actual water supply flow Q monitored by the first flowmeter_{Practice of}When the actual water supply flow rate Q_{Practice of}Total flow Q of theoretical water supply_{General assembly}When the water pump is not used, adjusting the water pump;

s3, judging the actual water supply flow Q_{Practice of}With a set total flow rate Q of water supply_{General assembly}When the phase of the mixture is the same as the phase of the mixture,controlling the opening degree of a first flow control valve corresponding to a preset rainfall area based on the preset rainfall area of the partitioned rainfall box and the rainfall intensity of the preset rainfall area to carry out rainfall;

and S4, closing the first flow control valve corresponding to the preset rainfall area, opening the second flow control valve and the drain valve, ending rainfall, closing the water pump, stopping water supply and discharging the residual water flow in the rainfall box.

According to the technical scheme provided by the embodiment of the specification, the embodiment of the invention can automatically control the opening and closing of the rainfall needle and the independent rainfall function of the subarea rainfall box, can accurately and simultaneously simulate the test conditions of stable rainfall change to high rainfall and uniform rainfall of multiple areas, and provides reliable test parameters for relevant research of geotechnical engineering and environmental engineering.

Drawings

Fig. 1 is a system diagram of a rainfall simulation system in accordance with some embodiments of the present disclosure.

Fig. 2 is a schematic view a of the installation of diverter valve, check valve, and rain needle according to some embodiments of the present disclosure.

Fig. 3 is a schematic view B illustrating installation of a drain valve of a raintank according to some embodiments of the present disclosure.

Fig. 4 is a schematic view of the configuration of the bottom of the rain case according to some embodiments of the present disclosure.

Fig. 5 is a schematic view of a configuration of a partition plate of a rainbox according to some embodiments of the present specification.

FIG. 6 is a schematic view of a hydraulic lift support apparatus according to some embodiments of the present disclosure.

FIG. 7 is a schematic illustration of monitoring data for some embodiments of the present description

Fig. 8 is a flow chart of a rainfall simulation method of some embodiments herein.

Fig. 9 is a detailed flow diagram of a slope model-based rainfall simulation method in accordance with some embodiments of the present disclosure.

Description of the drawings: 1. a water inlet pipeline; 2. a water tank; 3. a water inlet valve; 4. a water pump; 5. a first flow meter; 6. a water supply line; 7. a first flow control valve; 8. a second flow control valve; 9. a lifting support device; 10. a load-bearing platform; 11. anchor bolts; 12. a control device; 13. a check valve; 14. a diverter valve; 15. a rainfall needle head; 16. a needle head adapter; 17. a tertiary water supply line; 18. a rain box is arranged in a subarea; 19. a drain valve; 20. a second flow meter; 21. a drain line; 22. a longitudinal divider plate; 23. and a transverse partition plate.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present specification, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is obvious that the described embodiments are only a part of the embodiments of the present specification, and not all of the embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments in the present specification without any inventive step should fall within the scope of protection of the present specification.

As shown in fig. 1 to 6, some embodiments of the present disclosure provide a rainfall simulation system, which includes a rainfall device including a zoning raintank 18, a check valve 13, a diversion valve 14, a rainfall needle 15; the check valve 13 is arranged at the bottom of the subarea rain box 18, a first water outlet of the diverter valve 14 is connected with the rain needle 15, and a second water outlet of the diverter valve 14 is connected with the check valve 13; the water supply device comprises a water inlet pipeline 1, a water pump 4, a water supply pipeline 6 and a flow control valve; one end of the water inlet pipeline 1 is connected with a water source, the other end of the water inlet pipeline 1 is connected with an inlet of the water pump 4, and an outlet of the water pump 4 is connected with an inlet of the water supply pipeline 6; the water supply pipeline 6 comprises a primary water supply pipeline, at least two first secondary water supply pipelines, at least two second secondary water supply pipelines and at least two tertiary water supply pipelines 17; an outlet of the water pump 4 is connected with an inlet of a first-stage water supply pipeline, and an outlet of the first-stage water supply pipeline is connected with inlets of a first second-stage water supply pipeline and a second-stage water supply pipeline; the first secondary water supply pipeline is connected with a water inlet at the top of the subarea rain-falling box 18, and the second secondary water supply pipeline is connected with a tertiary water supply pipeline 17 at the bottom of the subarea rain-falling box 18; the flow control valves comprise at least two first flow control valves 7 and at least two second flow control valves 8, the first flow control valves 7 are arranged on the first secondary water supply pipeline and used for controlling the on and off of the first secondary water supply pipeline, and the second flow control valves 8 are arranged on the second secondary water supply pipeline and used for controlling the on and off of the third secondary water supply pipeline 17; the tertiary water supply pipeline 17 is connected with the water inlet of the diverter valve 14; and the control device 12, wherein the control device 12 is used for controlling the water supply device and the rainfall device.

In some embodiments of the present disclosure, a water tank 2, a water inlet valve 3 and a first flow meter 5 are disposed on the water inlet pipeline 1, the water tank 2 is used for storing water of a water source, the water inlet valve 3 is used for controlling a switch of water inlet management, and the first flow meter 5 is used for monitoring a total flow and an instantaneous flow of the water inlet pipeline 1; the water pump 4 is a variable frequency pump.

In some embodiments of the present disclosure, a transverse partition plate 23 and/or a longitudinal partition plate 22 is disposed in the rain boxes 18, and the transverse partition plate 23 and/or the longitudinal partition plate is used for partitioning the rain boxes 18; the first water outlet of the diverter valve 14 is connected with a rainfall needle 15 through a needle conversion joint 16; the check valve 13 is installed in an installation hole arranged at the bottom of the zoning rain box 18, and the aperture of the installation hole is matched with the outer diameter of the check valve 13; the zoning rain box 18 is further provided with a drain line 21, and the drain line 21 is provided with a second flowmeter 20 and a drain valve 19.

In some embodiments herein, the zoning rain box 18 is provided with 6 zones, and the number of the first secondary water supply line, the second secondary water supply line, the first flow control valve 7 and the second flow control valve 8 is 6.

In some embodiments of the present disclosure, the rainfall simulation system further includes a supporting device, the supporting device includes a lifting supporting device 9 and an anchor bolt 11, the lifting supporting device 9 is used for supporting the zoning rainbox 18 and adjusting the height of the zoning rainbox 18, and the anchor bolt 11 is used for fixing the lifting supporting device 9.

In some embodiments of the present description, the elevation support means 9 is a hydraulic elevation support means.

In some embodiments of the present description, the rainfall simulation system further includes an experimental apparatus, the experimental apparatus is disposed below the rainfall apparatus, the experimental apparatus includes a bearing platform 10, and the bearing platform 10 is used for bearing the rock-soil mass to be tested.

On the other hand, as shown in fig. 7, 8 and 9, some embodiments of the present disclosure further provide a rainfall simulation method, including:

s1, arranging a rainfall simulation system;

s2, controlling the water supply device to supply water based on the set total water supply flow Q_{General assembly}And the actual water supply flow rate Q monitored by the first flow meter 5_{Practice of}When the actual water supply flow rate Q_{Practice of}Total flow Q of theoretical water supply_{General assembly}When the water pump is not used, the water pump 4 is adjusted;

s3, judging the actual water supply flow Q_{Practice of}With a set total flow rate Q of water supply_{General assembly}When the rainfall is the same, controlling the opening degree of the first flow control valve 7 corresponding to the preset rainfall area based on the preset rainfall area of the zoning rain box 18 and the rainfall intensity of the preset rainfall area to perform rainfall;

and S4, closing the first flow control valve 7 corresponding to the preset rainfall area, opening the second flow control valve 8, ending rainfall, closing the water pump 4 and stopping the water supply system.

In some embodiments described herein, the method further includes, when the preset rainfall region of the divisional rainfall box 18 is changed, controlling the first flow control valve 7 corresponding to the changed preset rainfall region to be opened; when the rainfall intensity of the preset rainfall area changes, the opening degree of the first flow control valve 7 corresponding to the preset rainfall area is adjusted.

In some embodiments described in the present specification, the water inlet valve 3, the first flow control valve 7, the second flow control valve 8 are opened, the water discharge valve 19 of the rain box 18 is closed, and the sealing performance of the rainfall device is adjusted; opening the first flow control valve 7 of the preset rainfall area, and closing the first flow control valves 7 of other areas; opening a drain valve 19 of the preset rainfall area, closing the second flow control valves 8 of all areas, and making the preset rainfall area ready for rainfall; monitoring actual total water supply flow Q real based on specified total water supply flow Q input in a program interface, and adjusting Q real to be consistent with Q real; monitoring the flow of a drainage pipeline 21 in a preset rainfall area, closing a drainage valve 19 and a second flow control valve 8 after the drainage flow is consistent and stable with the inflow flow, and starting to simulate artificial rainfall; changing the rainfall intensity once at preset time intervals, and drawing a rainfall intensity and rainfall curve of a preset rainfall area based on monitoring data; repeating the steps until the rainfall simulation of the preset rainfall area is finished, closing the first flow control valves 7 and all the second flow control valves 8 of the preset rainfall area, opening the first flow control valves 7 of other areas, simulating artificial rainfall of other areas, and drawing rainfall intensity and rainfall curve of other areas based on the monitoring data; opening the second flow control valve 8 and stopping rainfall; the first flow rate control valve 7 is closed and the drain valve 19 is opened to drain water. With specific reference to fig. 1 to 9, the following method for simulating rainfall based on slope model data analysis is specifically explained as follows:

step 1: a water supply device, a control device, a supporting device and a rainfall device are installed as shown in figure 1. The installation steps are as follows:

firstly, installing a telescopic support frame shown in fig. 6, lowering the telescopic support frame to the lowest position, installing a subarea rain-reducing box 18 on the support frame, and starting a hydraulic device to lift the subarea rain-reducing box 18 to a designated rainfall height H.

Secondly, a one-way check valve 13, a diverter valve 14 and a needle are arranged on the bottom plate of the subarea rain box 18 shown in figure 4 according to figure 2.

And thirdly, a drainage pipeline 21, a second flowmeter 20 and a drainage valve 19 are arranged at the bottom of the subarea rain-falling box 18 according to the figure 3.

And installing the top cover of the subarea rain box 18 shown in the figure 5.

Installing a water tank 2 according to the figure 1, wherein the water outlet of the water tank 2 is connected with the water inlet of a water inlet valve 3, the water outlet of the water inlet valve 3 is connected with the water inlet of a variable frequency pump, the water outlet of the variable frequency pump is connected with the water inlet of a first flowmeter 5, and the water outlet of the first flowmeter 5 is connected with a primary water supply pipeline.

Sixthly, as shown in figure 1, the primary water supply pipeline is divided into 6 pairs of secondary water supply pipelines at the partition rain-reducing box 18, one branch of each pair of secondary water supply pipelines is connected with the partition water inlet of the partition rain-reducing box 18, and the other branch is connected with the tertiary water supply pipeline 17.

And a tertiary water supply pipeline 17 is connected with a water inlet of the branch valve 14.

Step 2: and opening the water inlet valve 3, the first flow control valve 7 and the second flow control valve 8, closing a drain valve 19 of the subarea rainfall box 18, and debugging the sealing performance of the rainfall device.

And step 3: opening the first flow control valves 7 of the No. 1 zone and the No. 6 zone, and closing the first flow control valves 7 of the No. 2-No. 5 zones; the drain valves 19 of the zones No. 1 and No. 6 are opened, and the second flow control valves 8 of all the zones are closed to prepare the zones No. 1 and No. 6 for rainfall.

And 4, step 4: inputting the specified total water supply flow Q and the water inlet flow Q of the No. 1 area on a program interface₁And the water inlet flow Q of No. 6 area₆。

And 5: monitoring the actual total flow Q of water supply_{Fruit of Chinese wolfberry}Adjusting Q_{Fruit of Chinese wolfberry}In agreement with Q.

Step 6: and monitoring the flow of the drainage pipelines 21 of the No. 1 area and the No. 6 area, closing the drainage valve 19 and the second flow control valve 8 after the drainage flow is consistent and stable with the inflow flow, and starting to simulate artificial rainfall.

And 7: the duration of rainfall is 30min, and the rainfall intensity is changed every 10 min.

And 8: the program records the rainfall intensity and the rainfall every 10min, and the rainfall intensity of the No. 1 area is i₁＝10mm/min、i₂＝8mm/min、i₃9mm/min, rainfall Q₁＝3ml/min、Q₁＝4ml/min、Q₁5 ml/min. Rainfall intensity in area 6 is i₁＝4mm/min、i₂＝5mm/min、i₃6mm/min, rainfall Q₁＝2ml/min、Q₁＝5ml/min、Q₁8 ml/min. The program automatically draws a rainfall intensity line graph and a rainfall amount line graph according to the monitoring data, such as a curve graph corresponding to the No. 1 area and the No. 6 area shown in the figure 7.

And step 9: and (5) repeating the step 3 to the step 8, closing the first flow control valves 7 and all the second flow control valves 8 in the No. 1 area and the No. 6 area, opening the first flow control valves 7 in the No. 2 to No. 5 areas, and simulating artificial rainfall in the No. 2 to No. 5 areas. The program automatically records the rainfall intensity and the rainfall capacity of No. 2-5 area, and the rainfall intensity of No. 2 area isi₁＝8mm/min、i₂＝7mm/min、i₃6mm/min, rainfall Q₁＝5ml/min、Q₁＝6ml/min、Q₁7 ml/min; rainfall intensity of No. 3 area is i₁＝10mm/min、i₂＝9mm/min、i₃8mm/min, rainfall Q₁＝7ml/min、Q₁＝8ml/min、Q₁9 ml/min; rainfall intensity of No. 4 area is i₁＝9mm/min、i₂＝6mm/min、i₃5mm/min, rainfall Q₁＝4ml/min、Q₁＝5ml/min、Q₁6 ml/min; rainfall intensity of No. 5 area is i₁＝7mm/min、i₂＝9mm/min、i₃8mm/min, rainfall Q₁＝3ml/min、Q₁＝5ml/min、Q₁6 ml/min. And automatically drawing a rainfall intensity and rainfall curve by the program according to the monitoring data, such as a rainfall intensity and rainfall curve graph in No. 1-6 area shown in figure 7.

Step 10: after the test is finished, opening the second flow control valve 8 and stopping rainfall; the first flow rate control valve 7 is closed and the drain valve 19 is opened to drain water.

In conclusion, the system of the invention utilizes the independent working function of water inlet and outlet of the diverter valve, the backflow prevention function of the check valve and the upper and lower water supply loops of the rainfall box to control different opening and closing conditions of the diverter valve and the one-way check valve, thereby realizing the automatic opening and closing function of the needle head, solving the defect of low automation degree of the pinhole type rainfall device, and also utilizes the automatic opening and closing function of the needle head in the scheme, firstly closing the needle head, opening the drainage pipe of the rainfall box to lead out water flow, closing the drainage pipe after the flow rate in the rainfall box reaches the designated value and is stable, opening the needle head, starting to simulate rainfall, and effectively avoiding the error caused by unstable flow rate in the flow rate regulation process. The intelligent variable frequency pump is used for controlling the total water supply flow of the primary water pipe, the flow electromagnetic valves are used for controlling the water supply flow of each subarea, the automatic opening and closing function of the needle heads is utilized, and the function of raining with variable intensity in any area in the raining tank is realized. The invention can control the frequency of the variable frequency pump in real time, monitor the measured value of the flowmeter, adjust the opening and closing degree of the flow control valve, realize the intelligent control of the needle tube type rainfall device, accurately and simultaneously simulate the test conditions of stable rainfall variation and uniform rainfall of multiple regions, and provide reliable test parameters for the relevant research of geotechnical engineering and environmental engineering.

While the process flows described above include operations that occur in a particular order, it should be appreciated that the processes may include more or less operations that are performed sequentially or in parallel (e.g., using parallel processors or a multi-threaded environment). The present invention is described with reference to flowchart illustrations and/or block diagrams of methods according to embodiments of the invention.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method or device comprising the element.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the method embodiment, since it is substantially similar to the apparatus embodiment, the description is simple, and the relevant points can be referred to the partial description of the apparatus embodiment. The above description is only an example of the present specification, and is not intended to limit the present specification. Various modifications and alterations to this description will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present specification should be included in the scope of the claims of the present specification.