CN218083462U - Automatic cement slurry proportioning system for mixing pile - Google Patents

Abstract

The application discloses mixing pile cement thick liquid automatic proportioning system, it includes agitator tank and charging box, the agitator tank is fixed on ground, the top surface of agitator tank with the charging box is fixed, the charge door has been seted up to the bottom of charging box, inside charge door intercommunication agitator tank, the lateral wall of charging box articulates there is the open-close plate that is used for closing and opening the charge door, and the lateral wall of charging box is fixed with and is used for driving open-close plate pivoted driving piece, the driving piece is located the charge door with between the open-close plate the top of charging box is fixed with the pipe, the pipe is kept away from the one end intercommunication of charging box has the reserve box, the water pump is installed to the pipe, the driving piece with the water pump is coupled and is used for controlling driving piece and water pump to open and stop. The application has the effect of improving the efficiency of additive addition.

Description

Automatic cement slurry proportioning system for mixing pile

Technical Field

The application relates to the field of civil engineering, in particular to an automatic proportioning system for cement slurry of a mixing pile.

Background

At present, foundation reinforcement is needed in building construction, so that the condition that the foundation sinks is not easy to happen to the building, and the safety of the construction process and the integral stability of the building are ensured.

The existing foundation reinforcing method comprises a grouting reinforcing method, an anchor rod static pressure pile method and a foundation base area increasing method, wherein the grouting reinforcing method is characterized in that a stirring pile is vertically stirred at a specified point and transferred into the ground, and after the stirring pile reaches a specified depth, the stirring pile head starts to perform cement grout pouring.

When cement grout is poured, the proportion of the cement grout can influence the overall reinforcing quality, in the existing grouting reinforcing method, water and cement are generally mixed into the cement grout through a grout making machine, a grout transporting device is started to transport the cement grout to a stirring box, in order to adjust the technological performance of the cement grout, an additive needs to be added into the stirring box filled with the cement grout for proportioning, and the cement grout is pumped into a grout storage tank after being uniformly stirred.

In the process of adding the admixture for proportioning, the admixture needs to be weighed and added manually and successively, time and labor are consumed, certain potential safety hazards exist, the completion efficiency of foundation stabilization engineering is reduced, and improvement is needed.

SUMMERY OF THE UTILITY MODEL

In order to improve the efficiency that the additive added, make the ratio of cement thick liquid more accurate and high-efficient, this application provides an automatic proportioning system of stirring stake cement thick liquid.

The application provides a pair of automatic proportioning system of stirring stake cement thick liquid adopts following technical scheme:

the utility model provides an automatic proportioning system of stirring stake cement thick liquid, the agitator tank is fixed on ground, the top surface of agitator tank with the charging box is fixed, the charge door has been seted up to the bottom of charging box, inside charge door intercommunication agitator tank, the lateral wall of charging box articulates there is the open-close plate that is used for closing and opening the charge door, the open-close plate with the charging box articulates there is the hinge bar, and the lateral wall of charging box is fixed with and is used for driving open-close plate pivoted driving piece, the driving piece is located the charge door with between the open-close plate the top of charging box is fixed with the pipe, the pipe is kept away from the one end intercommunication of charging box has the reserve case, the water pump is installed to the pipe, and the start button is coupled to the water pump, and the start button is used for sending start signal control water pump to start and stops, the driving piece with the water pump is coupled and is used for controlling the first pressure detection circuit that driving piece and water pump opened and stop, first pressure detection circuit includes:

the first pressure sensor is fixed on one surface, far away from the feeding opening, of the opening plate and used for detecting the weight in the feeding box and sending a first pressure detection signal;

the control unit is coupled with the first pressure sensor and is provided with a first threshold signal VREF1 so as to send a first control signal to the driving piece and the water pump when the first pressure detection signal is greater than the first threshold signal VREF1, the driving piece is started and the feed inlet is opened when receiving the first control signal, and the water pump is closed when receiving the first control signal; the charging opening is closed when the driving part loses the first control signal.

Through adopting above-mentioned technical scheme, when having the cement thick liquid that is used for the stirring stake to pour into when the agitator tank, start the water pump through pressing start button in order to pass through the pipe with the admixture in the preparation box and extract to the charging box, and the admixture of being extracted to the charging box is accepted by the open-close plate of charging box bottom, the admixture is temporarily stored in the charging box, when the admixture weight that the open-close plate was accepted is greater than first threshold value signal VREF1 that first pressure sensor set up, the control unit sends first control signal control water pump and shuts off, loosen start button and shut off the water pump, the circuit control driving piece starts, driving piece drive open-close plate rotates along keeping away from the charging box direction, it is the charge door and opens, the admixture is automatic to add into the agitator tank, then the driving piece loses electricity, the driving piece resets and makes open-close the rotation of open-close plate, close the charge door, in order to realize the function that the automatic interpolation of admixture, improve the admixture and add efficiency.

Preferably, first pressure sensor fixes the open-close plate is close to the one side of charging box, the one end that open-close plate was kept away from to first pressure sensor is fixed with the bearing plate.

Through adopting above-mentioned technical scheme, pressure sensor installs on the open-close plate, and the pressure sensor top is fixed with the bearing plate, and the admixture that gets into in the charging box drops to the bearing plate on, and the bearing plate transmits the weight of admixture to pressure sensor, makes pressure sensor more accurate to the weight measurement of admixture in the charging box.

Preferably, the spout has been seted up to the bottom surface of open-close plate, the spout extends the setting along the direction of perpendicular to hinge bar, the driving piece includes the cylinder, the cylinder is installed the charge door with between the open-close plate, the cylinder is installed with the hinge bar the same lateral wall of charging box, the piston rod of cylinder is kept away from the one end of charging box is fixed with the ball, the body and the piston rod of cylinder set up from bottom to top in the slope, the ball joint in the spout.

By adopting the technical scheme, when the air cylinder is electrified, the air cylinder contracts to enable the ball to move along the arrangement direction of the air cylinder, the ball is clamped with the chute, the displacement of the ball drives the opening-closing plate to rotate towards the direction far away from the feeding box, so that the feeding opening is opened, and the additive in the feeding box automatically falls into the stirring box; when the cylinder circuit was disconnected, the cylinder reset and extended, and the ball will open and shut the board top and return and make the charge door resume closed state.

Preferably, the control unit includes a first pressure comparing unit and a first switch unit, the first pressure comparing unit includes a first comparator N1, a first signal input end of the first comparator N1 is coupled to the first pressure sensor to receive the first pressure detection signal, a second signal input end of the first comparator N1 is coupled to the first threshold signal VREF1, and a signal output end of the first comparator N1 is coupled to the first switch unit.

By adopting the technical scheme, the first comparator N1 compares the first pressure detection signal accessed from the first signal input end to the first threshold signal VREF1 of the second signal input end in real time and outputs a pressure comparison signal, the signals are compared in time so as to control the switch unit to output a switch signal in the first time, and the function of comparing the pressure is realized through the comparator.

Preferably, the first switch unit includes a first transistor Q1 and a relay KM1, a base of the first transistor Q1 is coupled to the signal output end of the first comparator N1, an emitter of the first transistor Q1 is coupled to the power voltage VCC, a collector of the first transistor Q1 is connected in series with a coil of the relay KM1 and then grounded, the relay KM1 includes a normally-closed contact switch KM1-1 and a normally-open contact switch KM1-2, the normally-closed contact switch KM1-1 is connected in series in the power supply loop of the driving member, and the normally-open contact switch KM1-2 is connected in series in the power supply loop of the water pump.

By adopting the technical scheme, when the base of the first triode Q1 receives the pressure comparison signal, the base of the first triode Q1 is converted from a low level to a high level, the first triode Q1 is conducted to enable the coil of the relay KM1 to be electrified, the normally-closed contact switch KM1-1 is opened, the normally-open contact switch KM1-2 is closed, the power supply loop of the driving piece is conducted, and the power supply loop of the water pump is disconnected; when the base of the first triode Q1 does not receive the pressure comparison signal, the base of the first triode Q1 maintains low level, the first triode Q1 is not conducted, the coil of the relay KM1 is powered off, the normally-closed contact switch KM1-1 is disconnected again, the normally-open contact switch KM1-2 is conducted again, the power supply loop of the driving piece is disconnected, the power supply loop of the water pump is conducted, and the power on/off functions of the driving piece and the water pump are controlled.

Preferably, an acousto-optic prompter is installed on the outer wall of the stock tank, a second pressure detection circuit for controlling the acousto-optic prompter to be turned on or off is coupled to the acousto-optic prompter, and the second pressure detection circuit includes:

the second pressure sensor is arranged on the outer bottom wall of the stock tank and used for detecting the weight in the stock tank and sending a second pressure detection signal;

the second pressure comparison unit is coupled with the pressure detection unit and is provided with a second threshold signal VREF2 so as to send out a second pressure comparison signal when the second pressure detection signal is smaller than the second threshold signal VREF 2;

and the second switch unit is coupled with the second pressure comparison unit and is connected in series in a power supply loop of the acousto-optic prompter so as to send out a starting signal when receiving the pressure comparison signal, and the acousto-optic prompter is started when receiving the starting signal.

Through adopting above-mentioned technical scheme, at the in-process that the water pump extracted the admixture from the stock bin, the weight change of second pressure sensor real-time detection stock bin to send the second pressure measuring signal, when the second pressure measuring signal is less than second threshold value signal VREF2, the second pressure comparing unit sends pressure comparing signal to second switch unit, and second switch unit sends the enabling signal and makes the reputation prompting device open, and the staff must know the admixture in the stock bin and need the replenishment after the reputation prompting device opened.

Preferably, the second pressure comparing unit includes a second comparator N2, a first signal input end of the second comparator N2 is coupled to the second pressure sensor, a second signal input end of the second comparator N2 is connected to the second threshold signal VREF2, and a signal output end of the second comparator N2 is coupled to the second switching unit.

By adopting the technical scheme, the second comparator N2 compares the first pressure detection signal accessed from the first signal input end with the second threshold signal VREF2 of the second signal input end in real time and outputs a pressure comparison signal, the signals are compared in time so as to control the second switch unit to output a switch signal in the first time, and the comparator realizes the function of comparing the pressure of the stock tank.

Preferably, the second switching unit includes a second triode Q2, a base of the second triode Q2 is coupled to the signal output end of the second comparator N2, an emitter of the second triode Q2 is coupled to the power voltage VCC, and a collector of the second triode Q2 is grounded; the second switch unit further comprises a second relay KM2, a coil of the second relay KM2 is connected with a collector of the second triode Q2 in series and then grounded, the second relay KM2 comprises a normally-closed contact switch KM2-1, and the normally-closed contact switch KM2-1 is connected in series in a power supply loop of the acousto-optic prompter.

By adopting the technical scheme, when the base of the second triode Q2 receives the pressure comparison signal, the base of the second triode Q2 is converted from a high level to a low level, the second triode Q2 is conducted, the coil of the relay KM2 is electrified, the normally closed contact switch KM2-1 is opened, and the power supply loop of the acousto-optic prompter is conducted; when the base of the second triode Q2 does not receive the pressure comparison signal, the base of the second triode Q2 maintains high level, the second triode Q2 is not conducted, the coil of the relay KM2 loses power, the normally-closed contact switch KM2-1 is disconnected again, and the power supply loop of the acousto-optic prompter is disconnected, so that the function of controlling the acousto-optic prompter to lose power is achieved.

Preferably, the top of charging box is fixed with the apron, the apron edge with the top edge butt of charging box, the through-hole has been seted up to the apron, the pipe stretches into the through-hole just the pore wall of through-hole with the outer wall of pipe supports tightly, the apron is kept away from one side of charging box installs the handle.

Through adopting above-mentioned technical scheme, when needs inspection charging box inside condition, upwards pull open the apron through the handle to realize the inside daily inspection of charging box.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when sufficient cement slurry is in the stirring box, the additive content in and out of the feeding box is sufficient, the water pump is automatically turned off, the driving piece is automatically turned on, the opening port is opened, and the additive in the feeding box is automatically added into the stirring box, so that the function of automatically adding the additive is realized, and the additive adding efficiency is improved;

2. detecting the weight in the material preparation tank in real time, and when the additive in the material preparation tank is pumped by a water pump to be insufficient in content, enabling the acousto-optic prompter to be conducted by the second pressure detection circuit and to be started, so that a worker knows that the additive needs to be added into the material preparation tank;

3. the top of charging box is fixed with the apron of taking the handle, pulls up the apron through the handle to the inside condition of charging box is conveniently examined, guarantees the normal work of charging box.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present application.

Fig. 2 is a schematic view of the internal structure of the embodiment of the present application.

Fig. 3 is an enlarged view of a portion a of an embodiment of the present application.

Fig. 4 is a circuit diagram of a first pressure detection circuit in the embodiment of the present application.

Fig. 5 is a circuit diagram of a second pressure detection circuit in the embodiment of the present application.

Description of reference numerals:

1. a stirring box; 2. a feed box; 3. a conduit; 4. preparing a material box; 5. a cover plate; 6. a pulp inlet; 7. a pulp outlet; 8. a handle; 9. a through hole; 10. a water pump; 11. a second pressure sensor; 12. an acousto-optic prompter; 13. a feed inlet; 14. opening and closing the plate; 15. a bearing plate; 16. a cylinder; 17. hinging shafts; 18. a chute; 19. a ball bearing; 20. a first pressure sensor; 21. a first pressure comparison unit; 22. a first switch unit; 23. a second pressure comparison unit; 24. a second switching unit.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses an automatic proportioning system of stirring stake cement thick liquid. Referring to fig. 1, automatic proportioning system of stirring stake cement thick liquid includes agitator tank 1 and charging box 2, agitator tank 1 is fixed on ground, mortar inlet 6 and grout outlet 7 have been seted up to 1 lateral wall of agitator tank, agitator tank 1's top surface is fixed with charging box 2, charging box 2 is square, charging box 2's top articulates there is apron 5, 5 tops of apron are fixed with handle 8, through-hole 9 has been seted up to apron 5, through-hole 9 intercommunication has pipe 3, the pore wall of through-hole 9 is fixed with the pipe 3 outer wall, the one end intercommunication that charging box 2 was kept away from to pipe 3 has stock box 4, and pipe 3 passes stock box 4 and extends to stock box 4's bottom, water pump 10 is installed to pipe 3, start button is coupled to water pump 10, start button is used for sending start signal control water pump 10 starts and shuts down, water pump 10 installs at stock box 4 top.

Referring to fig. 2 and 3, a feed inlet 13 is formed in the bottom of a feed box 2, an opening is formed in the top of an agitator tank 1 and is communicated with the feed inlet 13, an opening plate 14 for closing and opening the feed inlet 13 is hinged to the side wall of the feed box 2, the opening plate 14 and the feed box 2 are hinged to each other, a sliding chute 18 is formed in the bottom surface of the opening plate 14, the sliding chute 18 extends in the direction perpendicular to the hinge rod, an air cylinder 16 is fixed at the bottom end of the feed box 2, a ball 19 is arranged at one end, away from the feed box 2, of the air cylinder 16, the ball 19 is embedded into the sliding chute 18 and clamped with the sliding chute 18, the air cylinder 16 contracts when being started, the opening plate 14 rotates in the direction away from the feed box 2, the feed inlet 13 is opened, and the additive in the feed box 2 automatically drops into the agitator tank 1; when the circuit of the air cylinder 16 is disconnected, the air cylinder 16 is reset and extended, the opening plate 14 is pushed back by the ball 19 to enable the charging opening 13 to be restored to the closed state, and the first pressure detection circuit for controlling the circuit to be opened or closed is coupled with the air cylinder 16 and the water pump 10.

Referring to fig. 2 and 4, the first pressure detection circuit includes: first pressure sensor 20 and the control unit, first pressure sensor 20 fixes in the one side that open close plate 14 is close to charging box 2, and the one end that open close plate 14 was kept away from to first pressure sensor 20 is fixed with bearing plate 15, and the edge of bearing plate 15 and the lateral wall butt of charging box 2, first pressure sensor 20 are used for detecting the weight in charging box 2 and send first pressure detection signal.

Referring to fig. 4, the control unit is composed of a first pressure comparing unit 21 coupled to the pressure detecting unit and provided with a first threshold signal VREF1 to be less than the threshold signal when the first pressure detecting signal is less than the threshold signal, and a first switching unit 22; the pressure comparison unit comprises a first comparator N1, a first signal input end of the first comparator N1 is a positive phase input end, the positive phase input end is coupled to the pressure sensor, a second signal input end of the first comparator N1 is a negative phase input end, the negative phase input end is connected to a first threshold signal VREF1, and a signal output end of the first comparator N1 is coupled to the switch unit.

Referring to fig. 4, a switching unit is coupled to the pressure comparison unit and connected in series in the power supply circuit of the cylinder 16 and the water pump 10 to send a switching signal when receiving the pressure comparison signal; the first switch unit 22 includes a PNP-type first triode Q1, a base of the first triode Q1 is coupled to a signal output end of the first comparator N1, an emitter of the first triode Q1 is coupled to a power voltage VCC, a collector of the first triode Q1 is grounded, the switch unit further includes a relay KM1, a coil of the relay KM1 is grounded after being connected in series with the collector of the first triode Q1, the relay KM1 includes a normally-closed contact switch KM1-1 and a normally-open contact switch KM1-2, the normally-closed contact switch KM1-1 is connected in series in a power supply loop of the cylinder 16, and the normally-open contact switch KM1-2 is connected in series in the power supply loop of the water pump 10.

Referring to fig. 1, an acousto-optic prompter 12 is installed on the outer wall of the stock tank 4, and a second pressure detection circuit for controlling the acousto-optic prompter 12 to be turned on or off is coupled to the acousto-optic prompter 12 and includes a second pressure sensor 11, a second pressure comparison unit 23 and a second switch unit 24.

Referring to fig. 1 and 5, a second pressure sensor 11 is installed at the outer bottom wall of the stock tank 4 for detecting the weight inside the stock tank 4 and emitting a second pressure detection signal; the second pressure comparing unit 23 includes a second comparator N2, a first signal input end of the second comparator N2 is coupled to the second pressure sensor 11, a second signal input end of the second comparator N2 is connected to a second threshold signal VREF2, and a signal output end of the second comparator N2 is coupled to a second switch unit 24.

Referring to fig. 5, the second switching unit 24 includes a second transistor Q2, a base of the second transistor Q2 is coupled to the signal output terminal of the first comparator N1, an emitter of the second transistor Q2 is coupled to the power voltage VCC, and a collector of the second transistor Q2 is grounded; the second switch unit 24 further comprises a second relay KM1, a coil of the second relay KM1 is connected with a collector of a second triode Q2 in series and then grounded, the second relay KM2 comprises a normally-closed contact switch KM2-1, the normally-closed contact switch KM2-1 is connected in series in a power supply loop of the audible and visual prompter 12, when the second switch unit 24 is switched on, the second relay is powered on to close the normally-closed contact switch KM2-1, and the audible and visual prompter 12 is started to emit prompting sounds and warning lights to remind a worker to perform charging operation; after the charging is finished, the second switch unit 24 loses power, the sound and light prompter 12 is turned off, and the prompting sound and the warning lamp stop.

The implementation principle of the automatic proportioning system for the cement slurry of the mixing pile in the embodiment of the application is as follows: when sufficient cement slurry is injected into the stirring box 1, the open close plate 14 is abutted against the inner wall of the feeding box 2 to form a closed space, a starting button is coupled to the water pump 10 and used for sending a starting signal to control the water pump 10 to start and stop, the admixture is pumped into the feeding box 2 from the stock tank 4 by the water pump 10, in the process, the first pressure sensor 20 detects the weight in the feeding box 2 in real time and sends a pressure sensing signal, when the admixture content in the feeding box 2 is sufficient, the first pressure sensing signal is greater than a first threshold signal VREF1, the signal output end of the first comparator N1 sends a liquid level comparison signal to the base of the first triode Q1, the base of the first triode Q1 is converted into a high level from a low level, the first triode Q1 is conducted, the normally closed contact switch KM1-1 is opened, the normally open contact switch KM1-2 is closed, the water pump 10 stops pumping the admixture into the feeding box 2, the air cylinder 16 starts to contract, and the ball 19 enables the open close plate 14 to slide downwards in the open close the admixture to drop into the stirring box 1 so as to realize the function of automatic admixture adding.

The continuous work of the water pump 10 enables the additive content in the stock chest 4 to be continuously reduced, in the process, the second pressure sensor 11 detects the weight change in the stock chest 4 in real time, when the additive in the stock chest 4 is ready to be exhausted, the second pressure detection signal is smaller than a second threshold signal VREF2, the signal output end of the second comparator N2 sends a pressure comparison signal to the base electrode of the second triode Q2, the base electrode of the second triode Q2 is converted from a high level to a low level, the second triode Q2 is conducted, the normally closed contact switch KM2-1 is turned on, the sound and light prompter 12 is turned on, and therefore a worker is reminded of adding the additive.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (9)

1. The utility model provides a mixing pile cement thick liquid automatic proportioning system, a serial communication port, including agitator tank (1) and charging box (2), agitator tank (1) is fixed on ground, the top surface of agitator tank (1) with charging box (2) are fixed, charging opening (13) have been seted up to the bottom of charging box (2), charging opening (13) intercommunication agitator tank (1) is inside, the lateral wall of charging box (2) articulates has open-close plate (14) that is used for closing and opening charging opening (13), open-close plate (14) with charging box (2) articulate has articulated pole, and the lateral wall of charging box (2) is fixed with and is used for driving open-close plate (14) pivoted driving piece, the driving piece is located between charging opening (13) and open-close plate (14) the top of charging box (2) is fixed with pipe (3), pipe (3) are kept away from the one end intercommunication of charging box (2) has ready box (4), water pump (10) are installed to pipe (3), water pump (10) are coupled with start button, start button is used for sending out stop signal control circuit (10) and start detection circuit (10) including first start-stop and start circuit detection pressure detection drive piece (10):

the first pressure sensor (20) is fixed on one surface, away from the feeding opening (13), of the opening plate (14) and used for detecting the weight in the feeding box (2) and sending a first pressure detection signal;

the control unit is coupled with the first pressure sensor (20) and is provided with a first threshold signal VREF1 so as to send a first control signal to the driving piece and the water pump (10) when the first pressure detection signal is greater than the first threshold signal VREF1, the driving piece is started and the feed opening (13) is opened when receiving the first control signal, and the water pump (10) is closed when receiving the first control signal; when the driving piece loses the first control signal, the feed inlet (13) is closed, and the water pump (10) is started when the first control signal is lost.

2. The automatic proportioning system of a mixing pile cement slurry according to claim 1, wherein the first pressure sensor (20) is fixed on one side of the opening plate (14) close to the feeding box (2), a bearing plate (15) is fixed on one end of the first pressure sensor (20) far away from the opening plate (14), and the edge of the bearing plate (15) is abutted against the inner wall of the feeding box (2).

3. The automatic proportioning system of stirring stake cement thick liquid of claim 2, characterized in that spout (18) have been seted up to the bottom surface of open-close plate (14), spout (18) extend along the direction of perpendicular to hinge bar and set up, the driving piece includes cylinder (16), cylinder (16) are installed charge door (13) with between the open-close plate (14), cylinder (16) and hinge bar are installed the same lateral wall of charging box (2), the piston rod of cylinder (16) is kept away from the one end of charging box (2) is fixed with ball (19), the body and the piston rod of cylinder (16) slope from bottom to top sets up, ball (19) joint in spout (18).

4. The system according to claim 3, wherein the control unit comprises a first pressure comparison unit (21) and a first switch unit (22), the first pressure comparison unit (21) comprises a first comparator N1, a first signal input terminal of the first comparator N1 is coupled to the first pressure sensor (20) to receive the first pressure detection signal, a second signal input terminal of the first comparator N1 is coupled to the first threshold signal VREF1, and a signal output terminal of the first comparator N1 is coupled to the first switch unit (22).

5. The system according to claim 4, wherein the first switch unit (22) comprises a first transistor Q1 and a relay KM1, a base of the first transistor Q1 is coupled to the signal output terminal of the first comparator N1, an emitter of the first transistor Q1 is coupled to the power supply voltage VCC, a collector of the first transistor Q1 is connected in series with a coil of the relay KM1 and then grounded, the relay KM1 comprises a normally closed contact switch KM1-1 and a normally open contact switch KM1-2, the normally closed contact switch KM1-1 is connected in series in the power supply loop of the driving member, and the normally open contact switch KM1-2 is connected in series in the power supply loop of the water pump (10).

6. The automatic proportioning system for mixing pile cement slurry according to claim 1, wherein an acousto-optic prompter (12) is installed on the outer wall of the stock tank (4), the acousto-optic prompter (12) is coupled with a second pressure detection circuit for controlling the acousto-optic prompter (12) to be turned on or off, and the second pressure detection circuit comprises:

the second pressure sensor (11) is arranged on the outer bottom wall of the preparation box (4) and is used for detecting the weight in the preparation box (4) and sending a second pressure detection signal;

a second pressure comparison unit (23) coupled to the pressure detection unit and provided with a second threshold signal VREF2 to generate a second pressure comparison signal when the second pressure detection signal is smaller than the threshold signal;

and the second switch unit (24) is coupled with the second pressure comparison unit (23) and is connected in series in a power supply loop of the acousto-optic prompter (12) to send out a starting signal when receiving the pressure comparison signal, and the acousto-optic prompter (12) is started when receiving the starting signal.

7. The automatic proportioning system of mixing pile cement slurry according to claim 6, wherein the second pressure comparing unit (23) comprises a second comparator N2, a first signal input end of the second comparator N2 is coupled to the second pressure sensor (11), a second signal input end of the second comparator N2 is connected to a second threshold signal VREF2, and a signal output end of the second comparator N2 is coupled to the second switching unit (24).

8. The system according to claim 7, wherein the second switching unit (24) comprises a second transistor Q2, a base of the second transistor Q2 is coupled to the signal output terminal of the second comparator N2, an emitter of the second transistor Q2 is coupled to the power supply voltage VCC, and a collector of the second transistor Q2 is grounded; the second switch unit (24) further comprises a second relay KM2, a coil of the second relay KM2 is connected with a collector of the second triode Q2 in series and then grounded, the second relay KM2 comprises a normally closed contact switch KM2-1, and the normally closed contact switch KM2-1 is connected in series in a power supply loop of the acousto-optic prompter (12).

9. The automatic mixing and proportioning system for the cement slurry of the mixing pile according to claim 1, wherein a cover plate (5) is fixed on the top of the charging box (2), the edge of the cover plate (5) is abutted against the edge of the top of the charging box (2), a through hole (9) is formed in the cover plate (5), the conduit (3) extends into the through hole (9), the wall of the through hole (9) is abutted against the outer wall of the conduit (3), and a handle (8) is installed on one side, far away from the charging box (2), of the cover plate (5).

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