Fluid end structure of diaphragm pump for conveying high-concentration slurry and control method

Abstract

The invention relates to the technical field of slurry conveying, and provides a fluid end structure of a diaphragm pump for conveying high-concentration slurry and a control method.The fluid end structure comprises a base, the diaphragm pump, a slurry inlet valve, a slurry discharging valve and a connecting pipeline, and the slurry discharging valve is arranged below a diaphragm chamber of the diaphragm pump; the connecting pipeline comprises a slurry inlet pipe, a slurry distributing pipe, a slurry storage pipe, a slurry output pipe, a slurry outlet pipe, a slurry discharge pipe, a connecting pipe and a connecting bent pipe, and the slurry inlet valve, the connecting pipe and the slurry discharge valve jointly form a three-way flow channel allowing slurry to flow back and forth. The three-cylinder pump of the diaphragm pump superposes smooth flow through three pistons with the phase difference of 120 degrees from the mechanical principle, a slurry return pipe and an external pressure stabilizing device dynamically absorb a pressure peak value and compensate a flow valley value by compressing and releasing nitrogen, and therefore pipeline pressure fluctuation is controlled within an extremely low range, and the pressure fluctuation of the pipeline is controlled within an extremely low range. The problems of large fluctuation and easy scaling in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of slurry conveying, in particular to a liquid end structure of a high-concentration slurry diaphragm pump and a control method. BACKGROUND

[0002] In the fields of mining, metallurgy, chemical industry and river dredging, long-distance pipeline conveying of high-concentration slurry is a key operation. At present, the traditional industrial two-cylinder filling diaphragm pump is widely used as the core conveying equipment for this operation.

[0003] However, in actual application, especially in harsh working conditions of high pressure, high concentration and long distance, the traditional structure exposes two fundamental technical problems to be solved. First, the conveying pressure and flow fluctuate greatly, and the system stability is poor. Due to the inherent working principle of the traditional two-cylinder pump, there will be a short flow interruption when the two pistons change direction, which will cause great pulsation of the output flow and pressure. The fluctuation coefficient is usually more than 100%. Such severe periodic impact is extremely dangerous for high-pressure pipeline systems, which can accelerate the fatigue damage of the pipeline and pipe fittings, cause loosening or even rupture at the connection, seriously threaten the safety and reliability of the entire conveying system, and also reduce the conveying efficiency. Second, the risk of scale formation and blockage in the diaphragm chamber is high, and the maintenance is frequent. In the traditional diaphragm pump liquid end structure, high-concentration slurry directly enters and flows through the diaphragm chamber during conveying. Due to the relatively large diaphragm chamber, the flow rate of the slurry in the chamber is reduced, and the solid particles in the slurry are prone to deposit on the inner wall of the chamber, the surface of the diaphragm and the corners. With the passage of time, these deposits will harden and scale, eventually causing flow blockage, diaphragm malfunction or rupture, which not only causes unplanned shutdown, but also makes the cleaning and maintenance work extremely tedious and costly SUMMARY

[0004] The present application provides a liquid end structure of a high-concentration slurry diaphragm pump and a control method, which solves the problems of large fluctuation and easy scaling in the related art.

[0005] The technical scheme of the present application is as follows: a liquid end structure of a high-concentration slurry diaphragm pump and a control method, comprising a base, a diaphragm pump, a slurry inlet valve, a slurry outlet valve, and a connecting pipeline; The slurry outlet valve is arranged below the diaphragm chamber of the diaphragm pump; The connecting pipeline comprises a slurry inlet pipe, a slurry distribution pipe, a slurry storage pipe, a slurry output pipe, a slurry outlet pipe, a slurry discharge pipe, a connecting pipe and a connecting elbow; The slurry inlet valve, the connecting pipe and the slurry outlet valve jointly constitute a three-way flow channel that allows the slurry to flow back and forth, so that the slurry is limited in the three-way flow channel and does not enter the diaphragm chamber above; The top of the diaphragm chamber is provided with a flushing water port, a water supplement port and a gas discharge port.

[0006] As a preferred scheme of the present application, the discharge pipe of the discharge valve is connected with a return pipe, and the return pipe is connected with an external pressure stabilizing device.

[0007] As a preferred scheme of the present application, the water supply port is connected with a water supply system through a water inlet pipe, and the water supply system comprises a water supply pump, an energy storage device, a two-position two-way valve on the water inlet pipe, and a check valve for preventing reverse flow.

[0008] As a preferred scheme of the present application, the two-position two-way valve is a pneumatic large-bore diaphragm valve, which is provided with a water inlet pipe and a gas inlet pipe.

[0009] As a preferred scheme of the present application, the energy storage device is an accumulator connected with the outlet pipe of the water supply pump.

[0010] As a preferred scheme of the present application, the diaphragm pump is a three-cylinder single-acting pump.

[0011] As a preferred scheme of the present application, the relative positional relationship among the diaphragm chamber, the connecting pipe and the space of the discharge valve is configured such that the slurry can be completely discharged from the three-way flow passage below the diaphragm chamber under the action of gravity during the discharge process.

[0012] As a preferred scheme of the present application, the slurry storage pipe and the slurry output pipe are connected with the three-way flow passage through the connecting elbow.

[0013] The control method of the liquid end structure of the diaphragm pump for conveying high-concentration slurry comprises the following steps: real-time monitoring of the running state of the diaphragm pump through an angle sensor installed on the crankshaft end to obtain an accurate piston position signal, and collecting system pressure data through a pressure transmitter arranged at the outlet of the discharge valve; the PLC in the control system accurately judges the working stroke of the diaphragm pump according to the received piston position signal, and immediately issues a water supply instruction when it is detected that the piston is in the slurry suction stroke and the pressure in the diaphragm chamber is lower than the pressure of the water supply system; according to the total water supply amount and the water supply time interval parameters pre-set through the touch screen, the PLC accurately controls the opening of the two-position two-way valve in the water supply system, quantitatively supplements clean water into the diaphragm chamber through the water supply port at the top of the diaphragm chamber, and the water supply amount is adaptively adjusted according to the slurry concentration and the conveying amount; during the water supply process, the energy storage device is used to maintain the pressure of the water supply system stable within the range of 1.0-1.5 MPa, and the check valve is used to effectively prevent the high-pressure medium in the diaphragm chamber from flowing reversely into the low-pressure water supply system, thereby ensuring that the elements of the water supply system are not impacted by high pressure; after each water supply is completed, the PLC controls the two-position two-way valve to be closed in time, completes a water supply cycle, records the water supply data and updates the next water supply time parameter.

[0014] As a preferred embodiment of the present invention, the following pressure stabilization control steps are also included: The pressure sensor installed on the main pipeline at the outlet of the slurry discharge valve monitors the slurry delivery pressure in real time, and the pressure data is transmitted to the PLC as a 4-20mA signal; when the pressure exceeds a preset upper limit, the PLC controls the pneumatic control valve on the return slurry pipe to open proportionally, allowing some high-pressure slurry to flow into the external pressure stabilization device, compressing the nitrogen bladder within it, storing energy, and reducing the system pressure; when the pressure is lower than a preset lower limit, the PLC controls the pneumatic control valve to gradually close, at which point the compressed nitrogen in the pressure stabilization device expands, pushing the stored slurry back to the main pipeline to compensate for the system flow rate; through this closed-loop regulation based on pressure feedback, the pressure fluctuation coefficient of the delivery system is strictly controlled within ±2.5%, while the PLC dynamically adjusts the response speed and opening of the control valve according to the pressure change trend, achieving intelligent and smooth adjustment of the delivery pressure, ensuring the stability and reliability of high-concentration slurry delivery.

[0015] The working principle and beneficial effects of this invention are as follows: This invention, through the design of a diaphragm pump and a return slurry pipe, uses the three-cylinder diaphragm pump to generate a smooth flow rate by superimposing three pistons with a phase difference of 120°. The return slurry pipe and the external pressure stabilizing device dynamically absorb pressure peaks and compensate for flow valleys by compressing and releasing nitrogen, thereby controlling pipeline pressure fluctuations within an extremely low range.

[0016] This invention, through the design of a slurry discharge valve and a diaphragm pump, ensures that the slurry flows strictly outside the diaphragm chamber via a three-way flow channel of the slurry discharge valve. Meanwhile, the independent diaphragm chamber is filled with clean water, and the three ports of the top diaphragm pump are used for cleaning, water replenishment, and air venting, thus ensuring the cleanliness of the medium inside the chamber and eliminating the risk of slurry contacting the diaphragm chamber and forming scale. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an overall side view of the present invention; Figure 3 For the present invention Figure 1 Enlarged view of section A in the image; Figure 4 This is a schematic diagram of the diaphragm pump control principle of the present invention; Figure 5 This is a schematic diagram of the water replenishment control principle of the present invention.

[0019] In the diagram: 1. Base; 2. Slurry inlet pipe; 3. Slurry distribution pipe; 4. Slurry inlet valve; 5. Slurry storage pipe; 6. Slurry outlet pipe; 7. Slurry discharge valve; 8. Slurry outlet pipe; 9. Slurry discharge pipe; 10. Slurry return pipe; 11. Connecting pipe; 12. Connecting bend pipe; 13. Diaphragm pump; 15. Two-position two-way valve; 16. Water and air inlet straight pipe; 17. Air inlet pipe; 18. Water inlet pipe. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] Example like Figures 1-5 As shown, a hydraulic end structure and control method for a diaphragm pump for conveying high-concentration slurry includes a base 1, a diaphragm pump 13, a slurry inlet valve 4, a slurry outlet valve 7, and connecting pipelines, characterized in that: The discharge valve 7 is located below the diaphragm chamber of the diaphragm pump 13; The connecting pipeline includes a slurry inlet pipe 2, a slurry distribution pipe 3, a slurry storage pipe 5, a slurry outlet pipe 6, a slurry outlet pipe 8, a slurry discharge pipe 9, a connecting pipe 11, and a connecting bend pipe 12; The slurry inlet valve 4, the connecting pipe 11, and the slurry outlet valve 7 together form a three-way flow channel that allows the slurry to flow back and forth, thus confining the slurry within the three-way flow channel and preventing it from entering the diaphragm chamber above. The top of the diaphragm chamber is equipped with a flushing water inlet, a water inlet, and an air vent.

[0022] A hydraulic end structure for a diaphragm pump 13 for conveying high-concentration slurry mainly includes a base 1, a diaphragm pump 13, a slurry inlet valve 4, a slurry outlet valve 7, and a connecting pipe 11. The slurry outlet valve 7 is located directly below the diaphragm chamber of the diaphragm pump 13. The connecting pipe 11 system forms an efficient conveying network, including a slurry inlet pipe 2, a slurry distribution pipe 3, a slurry storage pipe 5, a slurry outlet pipe 6, a slurry outlet pipe 8, a slurry discharge pipe 9, a connecting pipe 11, and a connecting bend 12. The slurry inlet valve 4, the connecting pipe 11, and the slurry outlet valve 7 together constitute the hydraulic end structure. A near-three-way flow channel strictly confines the slurry within this channel during the transport of high-concentration slurry, completely preventing the slurry from entering the diaphragm chamber above. Meanwhile, the diaphragm chamber itself acts as an independent chamber filled with clean water medium. Through the flushing inlet, water inlet, and venting outlet at its top, it respectively achieves the functions of shutdown flushing, programmed water replenishment, and removal of gas from the chamber. This fundamentally solves the problem of scaling and clogging of the diaphragm chamber due to contact with slurry.

[0023] A return pipe 10 is connected to the discharge pipe 8 of the discharge valve 7, and the return pipe 10 is connected to an external pressure stabilizing device.

[0024] A return slurry pipe 10 is connected in parallel to the slurry outlet pipe 8 of the slurry discharge valve 7. The return slurry pipe 10 is connected to an external pressure stabilizing device. When the pressure in the main slurry outlet pipe 8 generates periodic peaks due to the reciprocating motion of the pump, some high-pressure slurry will be forced into the return slurry pipe 10 and enter the pressure stabilizing device, where the nitrogen gas is compressed, thereby storing the pulse energy. When the pressure in the main slurry outlet pipe 8 drops, the compressed nitrogen gas expands, pushing the stored slurry back into the main slurry outlet pipe 8 to compensate for the flow rate, thus achieving an extremely low fluctuation coefficient in the conveying system.

[0025] The water inlet is connected to the water supply system via the water inlet pipe 18. The water supply system includes a water supply pump, an energy storage device, a two-position two-way valve 15 located on the water inlet pipe 18, and a one-way valve to prevent the fluid from flowing backward, all connected in sequence via pipes.

[0026] The water replenishment system is connected to the water inlet at the top of the diaphragm chamber via the inlet pipe 18. To ensure the reliability of the water replenishment process and to prevent conflict with the high pressure of the main pump, the water replenishment system is connected in series with a water replenishment pump, an energy storage device, a two-position two-way valve 15 located on the inlet pipe 18, and a check valve. The water replenishment pump provides the system with water and initial pressure; the energy storage device is used to maintain the stability of the system pressure; the two-position two-way valve 15 performs the water replenishment action; and the check valve structure only allows water to flow from the water replenishment system to the diaphragm chamber, strictly preventing the high pressure of 10-25MPa generated by the diaphragm pump 13 during operation from being transmitted in reverse to the low pressure of about 1MPa in the water replenishment system, thereby effectively protecting the components in the water replenishment system from damage caused by high pressure impact.

[0027] The two-position two-way valve 15 is a pneumatic large-diameter diaphragm valve. Its structure is equipped with water inlet and air inlet pipes 16, which are connected to water inlet pipe 18 and air inlet pipe 17 respectively.

[0028] The two-position two-way valve 15 has a unique water and air inlet straight pipe 16 interface. The interface connects to the water inlet pipe 18 from the water source and the air inlet pipe 17 from the compressed air source. In the non-water replenishment state, the electromagnetic pilot valve is in the open state. Compressed air enters the top of the valve body through the air inlet pipe 17, driving the internal piston to press down, compressing the spring and making the sealing block tightly close the nozzle and the one-way valve, thereby completely cutting off the water circuit. When water needs to be replenished, the PLC sends a signal, the water replenishment electromagnetic pilot valve switches, the compressed gas in the valve body is released, at this time, the compressed spring is released, its elastic force pushes the piston, drives the sealing block away from the nozzle, the water circuit is opened, and the clean water pushes open the one-way valve under the system pressure and enters the diaphragm chamber, effectively avoiding blockages that may be caused by water quality problems.

[0029] The energy storage device is an energy storage unit connected to the outlet pipeline of the water supply pump.

[0030] The energy storage device is specifically an accumulator, which is directly connected to the outlet pipe of the water supply pump via a pipeline. After the water supply pump starts, it pressurizes water into the system and compresses the nitrogen inside the accumulator until the preset pressure is reached, at which point the pump stops. Subsequently, when the system pressure drops due to several water supply operations, the compressed nitrogen expands to maintain the water supply pressure, eliminating the need for frequent starts of the water supply pump. The water supply pump will only start again to perform "pneumatic energy storage" when the system pressure drops to a certain threshold. This physically avoids the continuous operation and frequent start-stop of the water supply pump, saving energy and greatly extending the service life of the water supply pump, thereby improving the operational stability and reliability of the entire water supply system.

[0031] Diaphragm pump 13 is a three-cylinder single-acting pump.

[0032] The diaphragm pump 13 is a three-cylinder single-acting pump. Its structural feature is that the pump body contains three parallel plunger / diaphragm chambers. The three pistons are driven by a common crankshaft, but their phase difference is 120 degrees. When the crankshaft rotates, the three pistons sequentially perform the suction and discharge strokes. When one cylinder is at the end of the discharge stroke and the flow rate is about to be zero, another cylinder is just entering the middle of the discharge stroke and the flow rate is at its maximum. The third cylinder is in the transition state. After the flow rate curves of the three cylinders are superimposed, a very smooth total output flow rate is formed, which significantly reduces the output pulsation from a mechanical point of view.

[0033] The spatial relative positions of the diaphragm chamber, connecting pipe 11 and slurry discharge valve 7 are configured such that during the slurry discharge process, the slurry can be completely discharged from the three-way flow channel below the diaphragm chamber under the action of gravity.

[0034] The spatial relative positions of the diaphragm chamber, connecting pipe 11, and slurry discharge valve 7 are configured to ensure that the slurry discharge valve 7 is at the lowest point of the entire flow channel. When the piston performs the slurry discharge stroke, pushing the diaphragm to the right, the diaphragm transmits pressure to the slurry through the intermediate water medium, forcing the slurry to be discharged at high speed from the three-way flow channel through the slurry discharge valve 7. Because the slurry discharge valve 7 is located at the lowest position and the flow channel is designed without dead corners, the slurry can be cleanly discharged from the three-way flow channel below the diaphragm chamber at the end of the discharge process under the combined action of its own gravity and fluid pressure. This avoids slurry residue and deposition in the flow channel, further preventing the risk of scaling and clogging from a physical structural perspective.

[0035] The slurry storage pipe 5 and the slurry output pipe 6 are connected to the tee channel via the connecting bend 12.

[0036] The slurry storage pipe 5 and the slurry output pipe 6 are connected to a three-way flow channel consisting of the slurry inlet valve 4, the connecting pipe 11, and the slurry discharge valve 7 via a connecting bend 12. The connecting bend 12 is not only a simple fluid channel, but its curved structure also guides and buffers the fluid flow, so that the slurry sucked in from the slurry inlet valve 4 can smoothly enter the slurry storage pipe 5 for temporary storage, and during the slurry discharge process, it guides the slurry to be smoothly discharged from the slurry output pipe 6 through the slurry discharge valve 7, ensuring that the high-concentration slurry can circulate in the entire system with low resistance and without stagnation.

[0037] A control method for the hydraulic end structure of a diaphragm pump for conveying high-concentration slurry, characterized by the following steps: The operating status of the diaphragm pump 13 is monitored in real time by an angle sensor installed at the crankshaft end to obtain a precise piston position signal; simultaneously, system pressure data is collected by a pressure transmitter located at the outlet of the discharge valve 7; the PLC in the control system accurately determines the working stroke of the diaphragm pump 13 based on the received piston position signal; when the piston is detected to be in the slurry suction stroke and the pressure in the diaphragm chamber is lower than the pressure of the water replenishment system, the PLC immediately issues a water replenishment command; based on the total water replenishment amount and water replenishment time interval parameters preset via the touchscreen, the PLC... The two-position two-way valve 15 in the precise control water replenishment system opens, quantitatively replenishing clean water into the diaphragm chamber through the water inlet at the top of the diaphragm chamber. The water replenishment volume is adaptively adjusted according to the slurry concentration and delivery rate. During the water replenishment process, the energy storage device maintains the water replenishment system pressure stable within the range of 1.0-1.5MPa, and the one-way valve effectively prevents the high-pressure medium of 10-25MPa in the diaphragm chamber from flowing back into the low-pressure water replenishment system, ensuring that the components of the water replenishment system are not subjected to high-pressure impact. After each water replenishment is completed, the PLC controls the two-position two-way valve 15 to close in time, completing one water replenishment cycle, while recording the water replenishment data and updating the parameters for the next water replenishment. The slurry delivery pressure is monitored in real time by a pressure sensor installed on the main pipeline at the outlet of the slurry discharge valve 7. The pressure data is transmitted to the PLC as a 4-20mA signal. When the pressure exceeds the preset upper limit, the PLC controls the pneumatic control valve on the slurry return pipe 10 to open proportionally, allowing some high-pressure slurry to flow into the external pressure stabilizing device, compressing the nitrogen bladder inside, storing energy, and reducing the system pressure. When the pressure is lower than the preset lower limit, the PLC controls the pneumatic control valve to close gradually. At this time, the compressed nitrogen in the pressure stabilizing device expands, pushing the stored slurry back to the main pipeline to compensate for the system flow. Through this closed-loop regulation based on pressure feedback, the pressure fluctuation coefficient of the delivery system is strictly controlled within ±2.5%. At the same time, the PLC dynamically adjusts the response speed and opening of the control valve according to the pressure change trend, realizing intelligent and smooth regulation of the delivery pressure, ensuring the stability and reliability of high-concentration slurry delivery.

[0038] Working principle: The diaphragm pump 13 uses a three-cylinder single-acting pump as its power core. The three pistons with a phase difference of 120 degrees are driven by the crankshaft, so that the discharge strokes of the three cylinders are superimposed. From a mechanical point of view, the output flow is significantly smoothed, laying the foundation for low-fluctuation delivery. The discharge valve 7 is set below the diaphragm chamber and together with the inlet valve 4 and the connecting pipe 11, they form a three-way flow channel. This restricts the high-concentration slurry to flow back and forth within this flow channel and prevents it from entering the diaphragm chamber above. The diaphragm chamber, as an independent chamber, is always filled with clean water. The flushing port, water supply port and air vent at the top of the diaphragm chamber are used to achieve shutdown cleaning, maintain water quality and remove gas, respectively. This solves the problem of scaling and clogging of the diaphragm chamber from the structural root. To ensure extremely stable system pressure, a return pipe 10 is connected in parallel to the discharge pipe 8 of the discharge valve 7 and connected to an external pressure accumulator. The device dynamically absorbs pressure peaks and compensates for flow valleys by compressing or releasing nitrogen, thereby controlling pipeline fluctuations within an extremely low range. To maintain the stability of the water medium inside the diaphragm chamber, a dedicated automatic water replenishment system is provided. The water replenishment system is connected in sequence to the water replenishment pump, accumulator, two-position two-way valve 15, and check valve via the water inlet pipe 18. The check valve effectively prevents the high pressure in the pump chamber from back-impacting the low-pressure water replenishment system. The timing of water replenishment is determined by the intelligent control system. The position detection probe at the crankshaft end transmits the piston position signal to the PLC. The PLC determines the slurry suction stroke based on this signal. At this time, the pressure in the diaphragm chamber is lower than the pressure of the water replenishment system and issues a command to control the two-position two-way valve 15 to operate. The two-position two-way valve 15 is a pneumatic large-diameter diaphragm valve. The valve port is closed and opened by the synergistic action of the compressed air introduced by the air inlet pipe 17 and the internal spring. Its large-diameter structure effectively avoids blockage caused by water quality problems. The PLC can calculate the water replenishment time interval based on the total water replenishment amount set through the touch screen and perform timed and quantitative water replenishment during the slurry suction stroke. The entire system maintains the water replenishment pressure through the accumulator, reducing the start and stop frequency of the water replenishment pump and improving the system stability and energy efficiency. Finally, the smooth flow channel formed by the slurry storage pipe 5, the slurry output pipe 6 and the connecting bend pipe 12, and the spatial layout of the slurry discharge valve 7 located at the lowest point ensure that the slurry can be completely discharged under the action of gravity and fluid pressure.

[0039] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydraulic end structure for a diaphragm pump for conveying high-concentration slurry, comprising a base (1), a diaphragm pump (13), a slurry inlet valve (4), a slurry outlet valve (7), and connecting pipelines, characterized in that: The discharge valve (7) is located below the diaphragm chamber of the diaphragm pump (13); The connecting pipeline includes a slurry inlet pipe (2), a slurry distribution pipe (3), a slurry storage pipe (5), a slurry outlet pipe (6), a slurry outlet pipe (8), a slurry discharge pipe (9), a connecting pipe (11), and a connecting bend pipe (12). The slurry inlet valve (4), the connecting pipe (11) and the slurry outlet valve (7) together form a three-way flow channel that allows the slurry to flow back and forth, so that the slurry is confined within the three-way flow channel and does not enter the diaphragm chamber above. The top of the diaphragm chamber is equipped with a flushing water inlet, a water inlet, and a vent.

2. The hydraulic end structure of a diaphragm pump for conveying high-concentration slurry according to claim 1, characterized in that, A return pipe (10) is connected to the slurry outlet pipe (8) of the slurry discharge valve (7), and the return pipe (10) is connected to an external pressure stabilizing device.

3. The hydraulic end structure of a diaphragm pump for conveying high-concentration slurry according to claim 1, characterized in that, The water inlet is connected to the water supply system via the water inlet pipe (18). The water supply system includes a water supply pump, an energy storage device, a two-position two-way valve (15) located on the water inlet pipe (18), and a one-way valve to prevent the fluid from flowing backwards, all connected in sequence via pipes.

4. The hydraulic end structure of a diaphragm pump for conveying high-concentration slurry according to claim 3, characterized in that, The two-position two-way valve (15) is a pneumatic large-diameter diaphragm valve, which is equipped with a water inlet pipe (16) and an air inlet pipe (17), respectively.

5. The hydraulic end structure of a diaphragm pump for conveying high-concentration slurry according to claim 3, characterized in that, The energy storage device is an energy storage unit connected to the outlet pipeline of the water supply pump.

6. The hydraulic end structure of a diaphragm pump for conveying high-concentration slurry according to claim 1, characterized in that, The diaphragm pump (13) is a three-cylinder single-acting pump.

7. The hydraulic end structure of a diaphragm pump for conveying high-concentration slurry according to claim 1, characterized in that, The spatial relative positional relationship between the diaphragm chamber, the connecting pipe (11) and the slurry discharge valve (7) is configured such that during the slurry discharge process, the slurry can be completely discharged from the three-way flow channel below the diaphragm chamber under the action of gravity.

8. The hydraulic end structure of a diaphragm pump for conveying high-concentration slurry according to claim 1, characterized in that, The slurry storage pipe (5) and the slurry output pipe (6) are connected to the three-way flow channel through the connecting bend (12).

9. A control method for the hydraulic end structure of a diaphragm pump for conveying high-concentration slurry as described in any one of claims 1-8, characterized in that, Includes the following steps: The operating status of the diaphragm pump (13) is monitored in real time by an angle sensor installed at the crankshaft end to obtain a precise piston position signal. At the same time, the system pressure data is collected by a pressure transmitter set at the outlet of the discharge valve (7). The PLC in the control system accurately determines the working stroke of the diaphragm pump (13) based on the received piston position signal. When it is detected that the piston is in the suction stroke and the pressure in the diaphragm chamber is lower than the pressure of the water supply system, the PLC immediately issues a water supply command. According to the total water supply amount and water supply time interval parameters preset by the touch screen, the PLC precisely controls the two-position two-way valve (12) in the water supply system. 5) Open the system and add clean water to the diaphragm chamber through the water inlet at the top of the diaphragm chamber. The amount of water added is adaptively adjusted according to the slurry concentration and the amount of water delivered. During the water replenishment process, the pressure of the water replenishment system is kept stable in the range of 1.0-1.5MPa by the energy storage device, and the high pressure medium of 10-25MPa in the diaphragm chamber is effectively prevented from flowing back into the low pressure water replenishment system by the check valve, so as to ensure that the components of the water replenishment system are not impacted by high pressure. After each water replenishment is completed, the PLC controls the two-position two-way valve (15) to close in time, complete one water replenishment cycle, and at the same time record the water replenishment data and update the next water replenishment time parameters.

10. The control method according to claim 9, characterized in that, The following pressure stabilization control steps are also included: the pressure sensor installed on the main outlet pipeline of the slurry discharge valve (7) monitors the slurry delivery pressure in real time, and the pressure data is transmitted to the PLC in the form of a 4-20mA signal; when the pressure exceeds the preset upper limit, the PLC controls the pneumatic control valve on the slurry return pipe (10) to open proportionally, so that part of the high-pressure slurry flows into the external pressure stabilization device, compresses the nitrogen bladder therein, stores energy and reduces the system pressure; when the pressure is lower than the preset lower limit, the PLC controls the pneumatic control valve to close gradually, at which time the compressed nitrogen in the pressure stabilization device expands and pushes the stored slurry back to the main pipeline to compensate for the system flow; through this closed-loop regulation based on pressure feedback, the pressure fluctuation coefficient of the delivery system is strictly controlled within the range of ±2.5%, and at the same time, the PLC dynamically adjusts the response speed and opening of the control valve according to the pressure change trend to achieve intelligent and smooth adjustment of the delivery pressure, ensuring the stability and reliability of high-concentration slurry delivery.

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