阅读说明：本技术 一种延长混凝土运输时间的保坍装置及其保坍工艺 (Slump retaining device for prolonging concrete transportation time and slump retaining process thereof ) 是由 李志奇 袁立志 张慧峰 刘丽丽 赵聪聪 牛引生 张鹏飞 于 2020-07-13 设计创作，主要内容包括：本发明属于混凝土保坍技术领域,具体涉及一种延长混凝土运输时间的保坍装置及其保坍工艺,包括混凝土运输车,显示屏、水箱、控制箱、L型矩形管、清洗管和滴加管,L型矩形管包括内管和外管,所述运输车进料口处的卡板卡在外管螺栓上,内管伸入搅拌桶内；内管端口中心固定有摄像头,摄像头的两侧固定有聚光灯,清洗管从一侧的出管口伸出,滴加管从另一侧的出管口伸出,水箱内有两个水池,入管口外的清洗管分为水管和气管,分别与水泵、气泵连接,滴加管通过蠕动泵与水箱另一侧蓄水池连接,所述显示屏、水箱和控制箱设置在驾驶室内。该装置及工艺解决了混凝土长时间运输造成的混凝土经时坍损偏大的问题,可以广泛应用于各类混凝土的长途运输车上。(The invention belongs to the technical field of concrete slump retaining, and particularly relates to a slump retaining device for prolonging the concrete transportation time and a slump retaining process thereof, wherein the slump retaining device comprises a concrete transportation vehicle, a display screen, a water tank, a control box, an L-shaped rectangular pipe, a cleaning pipe and a dropping pipe, wherein the L-shaped rectangular pipe comprises an inner pipe and an outer pipe, a clamping plate at the feed inlet of the transportation vehicle is clamped on a bolt of the outer pipe, and the inner pipe extends into a stirring barrel; the camera is fixed at the center of the inner pipe port, spotlights are fixed on two sides of the camera, the cleaning pipe extends out from the outlet pipe on one side, the dropping pipe extends out from the outlet pipe on the other side, two water tanks are arranged in the water tank, the cleaning pipe outside the inlet pipe is divided into a water pipe and an air pipe which are respectively connected with a water pump and an air pump, the dropping pipe is connected with a water tank reservoir on the other side through a peristaltic pump, and the display screen, the water tank and the control box are arranged in the cab. The device and the process solve the problem of large concrete slump loss caused by long-time concrete transportation, and can be widely applied to long-distance transport vehicles of various types of concrete.)

1. The utility model provides a prolong slump retaining device of concrete transportation time which characterized in that: the concrete conveying vehicle comprises a concrete conveying vehicle (1), a display screen (2), a water tank (3), a control box (4), an L-shaped rectangular pipe (5) and a cleaning pipe (6) dropwise adding pipe (7), wherein two vertical clamping plates (8) are fixed on the side wall of a feed inlet, close to a feed hopper, of the conveying vehicle (1), the L-shaped rectangular pipe (5) comprises an inner pipe (51) and an outer pipe (52), an inlet pipe opening (53) is reserved in the side surface of the outer pipe (52), fixing bolts are symmetrically welded on the two sides of the outer pipe (52), nuts are screwed on the bolts, the clamping plates (8) at the feed inlet of the conveying vehicle are clamped on the bolts of the outer pipe (52), and the inner pipe (51) extends into a stirring barrel;

the port of the inner pipe (51) is an inclined port with a longer upper edge, an irregular rectangular glass plate (9) is sealed in the inclined port through glass cement, pipe outlets (91) are reserved in the upper left corner and the upper right corner of the glass plate (9), a camera (10) is fixed in the center of the port behind the glass plate (9), and spotlight lamps (11) are respectively fixed on two sides of the camera (10); the cleaning pipe (6) is L-shaped, one side of the cleaning pipe extends out of a pipe outlet (91) on one side of the glass plate (9), and is transversely fixed on the outer side of the glass plate (9) in parallel with the glass plate (9), and the dropping pipe (7) extends out of the pipe outlet (91) on the other side of the glass plate (9) and is fixed;

there are two reservoirs in water tank (3), scavenge pipe (6) outside mouth of pipe (53) divide into water pipe (61) and trachea (62), and one-way check valve (63) are linked in water pipe (61) and are connected with the cistern of water tank (3) one side through water pump (12), and one-way check valve (63) are linked in trachea (62) and are connected with air pump (13), the outer dropwise add pipe (7) of mouth of pipe (53) is connected with the cistern of water tank (3) opposite side through peristaltic pump (14), water pump (12), air pump (13) and peristaltic pump (14) are connected with control box (4) through the circuit, display screen (2) pass through the line connection with camera (10), display screen (2), water tank (3) and control box (4) set up in the driver's cabin.

2. A slump retaining device for prolonging the transit time of concrete according to claim 1, wherein: inner tube (51) and outer tube (52) of L type rectangular pipe (5) are the rectangular pipe, inner tube (51) and outer tube (52) welding, the angle scope that inner tube (51) and outer tube (52) become is 95 ° -110 °, the rectangular pipe cross section is 50 x 100mm, thickness is 3mm, inner tube (51) length is 300mm, be good at down along length on the slope port of inner tube (51) along at least 30mm, the length that dropping pipe (7) stretched out glass board (9) is 30mm, the port department of outer tube (52) is sealed.

3. A slump retaining device for prolonging the transit time of concrete according to claim 1, wherein: one end of the cleaning pipe (6) positioned outside the inlet pipe orifice (53) is respectively connected with the air pipe (62) and the water pipe (61) through a three-way connecting pipe, a one-way check valve and an electromagnetic control valve are installed at the joint of the cleaning pipe (6) and the three-way connecting pipe, and the electromagnetic control valve is connected with the controller (4) through a circuit; one side of the cleaning pipe (6) positioned on the outer side of the glass plate (9) is provided with a row of a plurality of flushing holes facing the glass plate (9), and the port of the cleaning pipe (6) on the outer side of the glass plate (9) is closed.

4. A slump retaining device for prolonging the transit time of concrete according to claim 1, wherein: the water tank (3) is arranged below a seat in the cab, a water storage tank on one side of the water tank (3) is flushing water, and a water storage tank on the other side of the water tank is an additive; the control box (4) is installed beside a central console in the cab, and a control button is arranged on the control box (4).

5. A slump retaining device for prolonging the transit time of concrete according to claim 1, wherein: the length and the width of the glass plate (9) are respectively matched with the size of the section of the inner pipe (51), and the glass plate (9) is aligned with the lower edge of the inclined port of the inner pipe (51) and is vertically fixed; the spotlights (11) on the two sides of the camera (10) incline 30 degrees towards the direction of the camera (10).

6. A slump retaining device for prolonging the transit time of concrete according to claim 1, wherein: the L-shaped rectangular pipe (5) is a steel pipe; the dropping pipe (6) is a polytetrafluoroethylene pipe; the glass plate (9) is made of ultra-white glass; the spotlight (11) is an LED white light lamp; the camera (10) is a 170-degree wide-angle 4k high-definition small starlight-level explosion-proof camera; the line specification is a vehicle-mounted line.

7. A slump retaining device for prolonging concrete transportation time and a slump retaining process thereof are characterized in that: the method comprises the following steps:

s1, pouring the concrete into a stirring barrel of the transport vehicle, and starting the slump retaining device;

s2, the transport vehicle starts to transport concrete, and the condition of the concrete in the mixing tank is observed through a display screen (2) in a cab of the transport vehicle;

s3, when the display screen (2) in the cab displays that the front glass sheet (9) of the camera (10) is polluted, cleaning and drying the pollutants in front of the camera (10) through the control box (4);

s4, when the slump of the concrete in the stirring barrel is observed to be about 200 +/-20 mm, correspondingly controlling the peristaltic pump (14) and the electromagnetic control valve through the control box (4) in the cab, and continuously dripping the additive;

s5, continuously observing the condition of the concrete in the mixing tank, and controlling the dropping amount of the additive through the control box (4) according to the condition of the concrete;

and S6, continuously dripping the additive, observing that the slump of the concrete in the stirring barrel meets the technical requirement, and continuously adding the additive until the concrete is transported to a construction site to be constructed, and stopping dripping the additive through the control box (4).

8. The slump retaining device for prolonging the concrete transportation time and the slump retaining process thereof according to claim 7, wherein the slump retaining device comprises: after the control box (4) is controlled in the step S3, the cleaning and drying are automatically controlled, the process includes that the water pump (12) is started to close the air pump (13), the electromagnetic control valve opens the water pipe (61) to close the air pipe (62), after the cleaning is delayed, the water pump (12) is automatically closed to open the air pump (13), and the electromagnetic control valve opens the air pipe (61) to close the water pipe (62).

9. The slump retaining device for prolonging the concrete transportation time and the slump retaining process thereof according to claim 7, wherein the slump retaining device comprises: the additive in the step S4 is a polycarboxylic acid water reducing agent.

10. The slump retaining device for prolonging the concrete transportation time and the slump retaining process thereof according to claim 7, wherein the slump retaining device comprises: the dripping amount range of the additive in the step S5 is 1 per thousand per hour of the addition amount of the concrete admixture per cubic meter.

Technical Field

The invention belongs to the technical field of concrete slump retaining, and particularly relates to a slump retaining device for prolonging concrete transportation time and a slump retaining process thereof.

Background

The rapid development of the society, the standardization of the national requirements for environmental protection, the gradual movement of concrete mixing plants from urban areas to suburban areas, the gradual increase of the transport distance, the increase of the traffic pressure, the gradual increase of the transport time, the great influence on the engineering quality and the construction progress, the long-term storage failure after the mixing of concrete materials, the reduction of the concrete slump caused by long-term storage, the reduction of the concrete workability, the increase of the construction difficulty, according to the regulation of GB/T14902-2012 'premixed concrete' 7.5.3, the secondary adjustment of the slump allowed by additives after the concrete reaches the construction site, but the adjusted concrete slump loss is quite rapid, such as poor control, easy pipe blockage, cupping and concrete scrapping treatment, and the low quality of constructors, the water is often added to increase the constructability, so that the great potential safety quality hazards are brought to the engineering, such as goods returning treatment and waste products are easily caused, therefore, appropriate measures must be taken to enhance the management of the transported concrete.

At present there is not a concrete equipment, can realize the inside concrete situation of real time monitoring tank car for the concrete has a management means in the transportation, can guarantee the quality of concrete, reduces the defective rate of engineering structure and the disability rate of concrete, and makes concrete transportation time prolong to 6 hours at least through suitable dropwise add, and along with the extension of time, intensity not only can not reduce, can increase 3MPa to 8MPa on the contrary, and final setting time is normal.

Therefore, there is a need to improve upon the above problems.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a slump retaining device for prolonging the concrete transportation time and a slump retaining process thereof, and the device can solve the problem of large concrete slump loss caused by long-time concrete transportation.

The technical scheme adopted by the invention is as follows:

a slump retaining device for prolonging concrete transportation time comprises a concrete transportation vehicle, a display screen, a water tank, a control box, an L-shaped rectangular pipe, a cleaning pipe and a dropping pipe, wherein two vertical clamping plates are fixed on the side wall of a feeding port, close to a feeding hopper, of the transportation vehicle, the L-shaped rectangular pipe comprises an inner pipe and an outer pipe, an inlet pipe opening is reserved on the side surface of the outer pipe, fixing bolts are symmetrically welded on the two sides of the outer pipe, nuts are screwed on the bolts, the clamping plates at the feeding port of the transportation vehicle are clamped on the bolts of the outer pipe, and the inner pipe extends into a stirring barrel; the port of the inner tube is an inclined port with a longer upper edge, an irregular rectangular glass plate is sealed in the inclined port through glass cement, pipe outlets are reserved in the upper left corner and the upper right corner of the glass plate, a camera is fixed in the center of the port behind the glass plate, and spotlights are fixed on two sides of the camera respectively; the scavenge pipe is the L type, the scavenge pipe wherein stretches out from the play mouth of pipe of glass board one side on one side, and transversely fixes in the glass board outside with the glass board is parallel, the dropwise add pipe stretches out fixedly from the play mouth of pipe of glass board opposite side, there are two cisterns in the water tank, the scavenge pipe outside the mouth of pipe divide into water pipe and trachea, and the water pipe passes through the cistern of water pump and water tank one side to be connected, and the trachea is connected with the air pump, the dropwise add pipe outside the mouth of pipe passes through the peristaltic pump to be connected with the cistern of water tank opposite side, water pump, air pump and peristaltic pump pass through the circuit and are connected with the control box, the display screen passes through line connection with the camera, display screen, water tank and control box set up.

The inner tube and the outer tube of L type rectangular pipe are the rectangular pipe, inner tube and outer tube welding, the angle that inner tube and outer tube become is 95 to 110, the rectangular pipe cross section is 50 x 100mm, thickness is 3mm, inner tube length is 300mm, follow length on the slope port of inner tube and be good at down along at least 30mm, the length that the dropwise add pipe stretches out the glass board is 30mm, the port department of outer tube is sealed.

One end of the cleaning pipe positioned outside the inlet pipe orifice is respectively connected with the air pipe and the water pipe through a three-way connecting pipe, a one-way check valve and an electromagnetic control valve are installed at the joint of the cleaning pipe and the three-way connecting pipe, and the electromagnetic control valve is connected with a controller through a line; one side of the cleaning pipe positioned on the outer side of the glass plate is provided with a row of a plurality of flushing holes facing the glass plate, and the port of the cleaning pipe on the outer side of the glass plate is closed.

The water tank is arranged below a seat in the cab, a water storage tank on one side of the water tank is used for storing washing water, and a water storage tank on the other side of the water tank is used for storing an additive; the control box is installed beside a central console in the cab, and a control button is arranged on the control box.

The length and the width of the glass plate are respectively matched with the size of the section of the inner tube, and the glass plate is aligned with and vertically fixed with the lower edge of the inclined port of the inner tube; the spotlights on the two sides of the camera are respectively inclined by 30 degrees towards the camera.

The L-shaped rectangular pipe is an aluminum pipe; the dropping pipe is a tetrafluoride pipe; the glass plate is ultra-white glass; the spotlight is an LED white light lamp; the camera is a 170-degree wide-angle 4k high-definition small-sized anti-explosion camera; the line specification is a vehicle-mounted line.

A slump retaining device for prolonging concrete transportation time and a slump retaining process thereof comprise the following steps:

s1, pouring the concrete into a stirring barrel of the transport vehicle, and starting the slump retaining device;

s2, the transport vehicle starts to transport concrete, and the condition of the concrete in the mixing barrel is observed through a display screen in a cab of the transport vehicle;

s3, when the display screen in the cab displays that the front glass sheet of the camera is polluted, cleaning and drying the pollutants in front of the camera through the control box;

s4, when the slump of the concrete in the stirring barrel is observed to be about 200 +/-20 mm, correspondingly controlling the peristaltic pump and the electromagnetic control valve through the control box in the cab, and continuously dripping the additive;

s5, continuously observing the condition of the concrete in the mixing tank, and controlling the dropping amount of the additive through the control box according to the condition of the concrete;

and S6, continuously dripping the additive, observing that the slump of the concrete in the stirring barrel meets the technical requirement, and continuously adding the additive until the concrete is transported to a construction site to be constructed, and stopping dripping the additive through the control box.

After the control box is controlled in the step S3, the cleaning and drying are automatically controlled, the process includes turning on the water pump and turning off the air pump, turning on the water pipe and turning off the air pipe by the electromagnetic valve, and after the cleaning is delayed, turning off the water pump and turning on the air pump automatically, and turning on the air pipe and turning off the water pipe by the electromagnetic valve.

The additive in the step S4 is a polycarboxylic acid water reducing agent.

The dripping amount of the additive in the step S5 is 1 per mill/h of the addition amount of the concrete admixture per cubic meter.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, the time control shaft is added in the transportation process, and the slump retaining agent is dripped into the stirring tank at a corresponding speed, so that the problems that the concrete slump loss is large due to long-time transportation, the workability of the concrete is influenced, and the quality of the concrete cannot be controlled due to the time extension are avoided in the transportation process of the concrete.

2. According to the invention, the camera is added in the stirring tank, and the display screen is added in the cab, so that the real-time monitoring of concrete in the stirring tank can be realized, and targeted measures can be taken.

3. The slump retaining device is arranged on the upper wall of the tank body feeding opening, the whole device is made of materials with good heat conductivity, and the camera is arranged without influencing lighting, so that the device is not influenced by concrete.

4. The multifunctional washing device is arranged above the camera, so that the glass plate can be washed and air-washed and dried at any time, and the observation quality of concrete is guaranteed.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic structural view of an L-shaped rectangular tube section of the present invention;

FIG. 3 is a schematic view of the installation position of the L-shaped rectangular tube according to the present invention;

FIG. 4 is a schematic structural view of an inner tube portion of the present invention;

wherein: the device comprises a carrier vehicle 1, a display screen 2, a water tank 3, a control box 4, an L-shaped rectangular pipe 5, a cleaning pipe 6, a dropping pipe 7, a clamping plate 8, a glass plate 9, a camera 10, a spotlight 11, a water pump 12, an air pump 13, a peristaltic pump 14, an inner pipe 51, an outer pipe 52, an inlet pipe 53, a water pipe 61, an air pipe 62, a one-way check valve 63 and an outlet pipe 91.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 4, a slump retaining device for prolonging concrete transportation time comprises a concrete transportation vehicle 1, a display screen 2, a water tank 3, a control box 4, an L-shaped rectangular pipe 5, a cleaning pipe 6 and a dropping pipe 7, wherein two vertical clamping plates 8 are fixed on the side wall of a feeding port of the transportation vehicle 1 close to a feeding hopper, the L-shaped rectangular pipe 5 comprises an inner pipe 51 and an outer pipe 52, a feeding pipe opening 53 is reserved on the side surface of the outer pipe 52, a circuit, the cleaning pipe 6 and the dropping pipe 7 penetrate through the feeding pipe opening 53, fixing bolts are symmetrically welded on two sides of the outer pipe 52, nuts are screwed on the bolts, the clamping plates 8 at the feeding port of the transportation vehicle are clamped on the bolts of the outer pipe 52, the L-shaped rectangular pipe 5 is fixed at the feeding port of a stirring barrel, and the inner pipe 51 extends into the stirring barrel;

the port of the inner pipe 51 is an inclined port with a longer upper edge, the inclined port can be concrete such as a camera 10 for resisting collapse, the use efficiency of the device is realized, an irregular rectangular glass plate 9 is sealed in the inclined port through glass cement, an outlet 91 is reserved at the upper left corner and the upper right corner of the glass plate 9, the camera 10 is fixed at the center of the port behind the glass plate 9, and spotlights 11 are respectively fixed at two sides of the camera 10; the cleaning pipe 6 is L-shaped, one side of the cleaning pipe extends out of the outlet 91 at one side of the glass plate 9 and is transversely fixed outside the glass plate 9 in parallel with the glass plate 9, and the dropping pipe 7 extends out of and is fixed at the outlet 91 at the other side of the glass plate 9;

two water storage tanks are arranged in the water tank 3 and can store two kinds of liquid, the cleaning pipe 6 outside the pipe inlet 53 is divided into a water pipe 61 and an air pipe 62, the pipe is multipurpose, the structure is simplified, at the same time, the function can be better realized, the water pipe 61 is connected with the reservoir at one side of the water tank 3 through the water pump 12, the air pipe 62 is connected with the air pump 13, the dropping pipe 7 outside the inlet pipe mouth 53 is connected with the reservoir at the other side of the water tank 3 through the peristaltic pump 14, the peristaltic pump 14 can realize the dropping function, the water pump 12, the air pump 13 and the peristaltic pump 14 are connected with the control box 4 through lines, the display screen 2 is connected with the camera 10 through lines, display screen 2, water tank 3 and control box 4 set up in the driver's cabin, and water tank 3 places and accords with the repacking requirement of stirring transport vechicle 1 in the driver's cabin, controls whole device by control box 4 in the driver's cabin at last.

Inner tube 51 and outer tube 52 of L type rectangular pipe 5 are the rectangular pipe, inner tube 51 and outer tube 52 welding, the angle scope that inner tube 51 and outer tube 52 become is 95 to 110, guarantees that display screen 2 can be clear sees the condition at agitator center, the rectangular pipe cross section is 50 x 100mm, thickness is 3mm, inner tube 51 length is 300mm, and outer tube length decides according to the motorcycle type, be good at down along length on the slope port of inner tube 51 along at least 30mm, the length that dropwise add pipe 7 stretches out glass board 9 is 30mm, just can not influenced by the concrete in last edge, the port department of outer tube 52 is sealed.

One end of the cleaning pipe 6 positioned outside the inlet 53 is respectively connected with the air pipe 62 and the water pipe 61 through a three-way connecting pipe, a one-way check valve and an electromagnetic control valve are arranged at the joint of the cleaning pipe 6 and the three-way connecting pipe, so that water backflow is prevented, water is not discharged during air blowing, air is not blown during water discharging, and the electromagnetic control valve is connected with the controller 4 through a line; one side of the cleaning pipe 6 positioned on the outer side of the glass plate 9 is provided with a row of a plurality of flushing holes facing the glass plate 9, the camera 10 is sprayed and dried from the upper end of the camera 10, the port of the cleaning pipe 6 on the outer side of the glass plate 9 is closed, and water and air are only sprayed out from the flushing holes.

The water tank 3 is arranged below a seat in a cab, a water storage tank on one side of the water tank 3 is flushing water, and a water storage tank on the other side of the water tank 3 is an additive, so that one tank is multipurpose; the control box 4 is installed beside a center console in the cab, so that a driver can conveniently control the control box, and the control box 4 is provided with control buttons, namely a switch button, a dripping speed adjusting button, a cleaning button and the like.

The length and the width of the glass plate 9 are respectively matched with the size of the cross section of the inner tube 51, the lower edges of the inclined ports of the glass plate 9 and the inner tube 51 are aligned and vertically fixed, the glass plate 9 and the like are sealed, black glass cement is used, the device in the L-shaped rectangular tube 5 can be prevented from being influenced by the environment in the stirring barrel, and the camera 10 is not easy to generate fog, condensate water and the like; the spotlights 11 on the two sides of the camera 10 are respectively inclined by 30 degrees towards the direction of the camera 10, so that the camera 1 can obtain the clearest light without exposure.

The L-shaped rectangular pipe 5 is an aluminum pipe and has good heat conducting property; the dropping pipe 6 is a tetrafluoride pipe and is not stained with concrete; the glass plate 9 is made of ultra-white glass, and refraction is not affected; the spotlight 11 is an LED white light lamp, and the required voltage is 24V; the camera 10 is a 170-degree wide-angle 4k high-definition small-sized explosion-proof camera, so that the clear picture is ensured; the circuit specification is vehicle-mounted circuit, and is anticorrosive.

A slump retaining device for prolonging concrete transportation time and a slump retaining process thereof comprise the following steps:

s1, pouring the concrete into a stirring barrel of the transport vehicle, and starting the slump retaining device;

s2, the transport vehicle starts to transport the concrete, the condition of the concrete in the mixing tank is observed through the display screen 2 in the cab of the transport vehicle, and the additive is dripped gradually;

s3, when the display screen 2 in the cab displays that the front glass sheet 9 of the camera 10 is polluted, cleaning and drying the pollutants in front of the camera 10 through the control box 4, firstly washing and then drying to ensure that the picture is clear and not influenced;

s4, when the slump of the concrete in the mixing tank is observed to be about 200 +/-20 mm, correspondingly controlling the peristaltic pump 14 and the electromagnetic control valve through the control box 4 in the cab, and continuously dripping the additive;

s5, continuously observing the condition of the concrete in the mixing tank, and controlling the dropping amount of the additive through the control box 4 according to the condition of the concrete;

s6, continuously adding the additive in a dropwise manner, observing that the slump of the concrete in the stirring barrel meets the technical requirement, continuously adding the additive until the concrete is transported to a construction site to be constructed, stopping adding the additive in a dropwise manner through the control box 4, and gradually increasing the strength of the concrete by 3-8 MPa along with the prolonging of the dropwise adding time.

After the control box 4 is controlled in step S3, the cleaning and drying process is an automatic control process, in which the water pump 12 is first turned on to close the air pump 13, the electromagnetic control valve turns on the water pipe 61 to close the air pipe 62, after the cleaning process is delayed, the water pump 12 is automatically turned off to open the air pump 13, and the electromagnetic control valve turns on the air pipe 61 to close the water pipe 62.

The additive in the step S4 is a polycarboxylic acid water reducing agent.

The dropping amount of the additive in the step S5 is 1 per thousand per hour of the adding amount of the concrete admixture per cubic meter, that is, if the standard adding amount of the concrete is 2.5%, the additive is continuously dropped into the concrete by 0.1% per hour, that is, about 500 g-800 g per square hour, wherein the dropping amount is increased when the strength is higher.

The invention applies the display screen 2 and the camera 10 in the mixing tank and in the cab to realize the state monitoring of the concrete, the L-shaped rectangular pipe 5 arranged at the feed inlet is connected with the water tank 3 and the like, so that the additive is dripped into the concrete while the concrete state is monitored, the problem of long-distance transportation is solved, the problem of concrete quality deterioration caused by the unavoidable overlong time is solved, the processes of frequently getting off the vehicle by a driver for checking and adding outside the vehicle are also omitted, the quality of the concrete is ensured to the maximum extent, the transportation efficiency is improved, the problem of damage to the stirring barrel caused by the coagulation in the concrete tank is also greatly reduced, the cost is saved, the whole device can ensure that the concrete has no change in the long-time transportation process for 6 to 8 hours, and the concrete is consistent with the normal concrete in setting time from the stop of dripping to the setting, and the performance state is relatively stable.

Although only the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all changes are encompassed in the scope of the present invention.