A hydraulic diaphragm pump electric proportional flow control device and control method thereof

Abstract

The present invention discloses a flow control valve, aiming to provide a hydraulic diaphragm pump electric proportional flow control device and a control method thereof, which can proportionally adjust the flow in a pump body according to the outlet flow of the pump, has a high degree of automation, and can automatically detect the working state of the pump body. The key points of the technical scheme are to accurately control and meter the hydraulic end of the hydraulic diaphragm metering pump through a central control system, a signal amplifier, a flow detection device and a flow control device, and the flow control device is set as a proportional electromagnet and a one-way valve connected to the proportional electromagnet, so that the flow control device can convert the flow electrical signal in the pump body into the displacement action of the valve core, thereby dynamically adjusting the size of the liquid outlet of the one-way valve to achieve accurate proportional flow output. The present invention is applicable to the field of hydraulic pump control technology.

Description

Technical Field

[0001] The present invention relates to a flow control valve, and more particularly to an electric proportional flow regulating device for a hydraulic diaphragm pump and a control method thereof. Background Art

[0002] The hydraulic diaphragm pump has a unique self-priming ability and can be used to transport high-temperature, high-pressure, large particles and other media. It can separate the conveying medium from the working medium during operation, and theoretically can achieve zero leakage. At the same time, during the operation of the hydraulic diaphragm pump, it is necessary to adjust the flow at its hydraulic end. At present, the flow adjustment of the pump body is usually carried out by the staff through the setting of a ball valve to adjust the size of the opening end. This method usually requires manual adjustment by the staff, which reduces the control accuracy of the device at large flow rates.

[0003] As an electro-mechanical conversion device of the electro-hydraulic proportional control element, the proportional solenoid can convert the current signal into force or displacement proportionally. By setting the proportional solenoid in the hydraulic diaphragm pump body, the size of the opening end can be automatically adjusted, thereby improving the control accuracy of the device. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a hydraulic diaphragm pump electric proportional flow regulation device and a control method thereof, which can proportionally regulate the flow in the pump body according to the outlet flow of the pump, has a high degree of automation, and can automatically detect the working state of the pump body.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a hydraulic diaphragm pump electric proportional flow control device, comprising a hydraulic diaphragm pump, the hydraulic diaphragm pump is provided with a flow control device, the flow control device comprises a proportional electromagnetic assembly and a one-way valve assembly, the proportional electromagnetic assembly comprises a valve body, a valve core arranged in the valve body and an electromagnetic coil arranged around the valve core, a guide sleeve is further provided between the valve core and the electromagnetic coil, a bearing is further provided between the valve core and the guide sleeve, the valve core rotates in the guide sleeve through the bearing, an adjusting spring is further provided at one end of the valve core, and the adjusting spring is configured to allow the valve core to slide along its axial direction inside the valve body;

[0006] The one-way valve assembly includes a one-way valve seat, a liquid inlet and a liquid outlet arranged on the one-way valve seat, the liquid inlet is arranged at the bottom of the one-way valve seat, the liquid outlet is arranged on the side wall of the one-way valve seat, the end of the valve core away from the adjusting spring is arranged inside the one-way valve seat and at least blocks the liquid outlet, a flow channel is provided between the liquid inlet and the liquid outlet, a one-way valve ball is provided in the flow channel, a one-way valve spring is also provided between the one-way valve ball and the valve core, the one-way valve ball and the one-way valve spring are used to push the valve core and control the size of the opening of the liquid outlet.

[0007] The present invention is further configured as follows: a limiting gasket and a U-shaped ring are provided between the valve core and the valve body.

[0008] The present invention is further configured as follows: a thread is provided on the outer side of the one-way valve seat, the flow regulating device is threadedly connected to the hydraulic diaphragm pump via the one-way valve, and an O-ring is also sleeved on the outside of the one-way valve.

[0009] Preferably, after the flow regulating device is connected to the hydraulic diaphragm pump, the liquid inlet of the one-way valve seat is connected to the hydraulic cylinder of the hydraulic diaphragm pump, and the liquid outlet of the one-way valve seat is connected to the oil chamber of the hydraulic diaphragm pump.

[0010] The present invention is further configured as follows: a fastening screw is also provided on the valve body, and the fastening screw is used to enhance the connection strength between the flow regulating device and the hydraulic diaphragm pump.

[0011] The present invention is further configured as follows: a magnetic isolation ring is also provided in the guide sleeve.

[0012] The present application also provides a control method for an electric proportional flow control device of a hydraulic diaphragm pump, characterized in that it also includes a flow detection device, a central control system and a signal amplifier, wherein the flow detection device is used to receive a flow signal and upload it to the central control system, and the signal amplifier is used to amplify a weak signal, and the control method includes the following steps: S1, the flow detection device detects a 4-20mA data signal of a flow meter at a pump outlet, and uploads the signal to the central control system;

[0013] S2, the central control system transmits the 4-20mA data signal to the signal amplifier according to the flow requirements;

[0014] S3, the signal amplifier amplifies the flow data to 0-1000mA and transmits the amplified signal to the flow regulating device;

[0015] S4. The flow regulating device controls the movement of the valve core and adjusts the stroke of the valve core so that the outlet of the one-way valve seat is opened, and the hydraulic oil in the hydraulic cylinder of the hydraulic diaphragm pump is diverted back to the oil chamber.

[0016] Preferably, a pressure detection device is further provided in the regulating spring, and the step S4 also includes pump body blockage detection, including the following steps: S41, after the valve core is adjusted, the central control system sets the valve core pressure detection lower limit value P;

[0017] S42, the pressure detection device continuously detects the pressure value of the regulating spring, and the detection time is T;

[0018] S43, after the T time period, the pressure detection device detects that the pressure value of the regulating spring is P1;

[0019] S44, if P1>P, it is judged that the pump body is operating normally, the device continues to operate, and jumps back to S42 to continue testing. Otherwise, it jumps to S45 to continue testing;

[0020] S45, if P1≤P, the pump is judged to be blocked, and the central control system increases the speed of the pump and continues to run for T1 time;

[0021] S46, after T1 time, the pressure P2 of the pressure detection device is detected again. If P2>P, it is determined that the pump body is operating normally, the device continues to operate, and jumps back to S42 to continue detection. Otherwise, it jumps to S47 to continue detection;

[0022] S47. If P2≤P, the pump body is judged to be seriously blocked, the device stops running, and the staff is notified to repair it.

[0023] By adopting the above technical solution, the hydraulic end of the hydraulic diaphragm metering pump is accurately controlled and metered through the central control system, signal amplifier, flow detection device and flow regulation device, and the flow regulation device is set as a proportional electromagnet and a one-way valve connected to the proportional electromagnet, so that the flow regulation device can convert the flow electrical signal in the pump body into the displacement action of the valve core, thereby dynamically adjusting the size of the liquid outlet of the one-way valve to achieve precise proportional flow output.

[0024] Furthermore, by arranging a one-way valve assembly at one end of the electromagnet, the one-way valve assembly includes a one-way valve seat, a liquid inlet and a liquid outlet arranged on the one-way valve seat, the liquid inlet is arranged at the bottom of the one-way valve seat, the liquid outlet is arranged on the side wall of the one-way valve seat, the end of the valve core away from the adjusting spring is arranged inside the one-way valve seat, and at least blocks the liquid outlet, so that the liquid outlet remains normally closed under normal conditions. After the proportional electromagnet detects the flow change at the pump outlet end, the electromagnetic coil generates magnetic force and controls the movement of the valve core, thereby opening the liquid outlet and completing the proportional regulation of the flow.

[0025] At the same time, in order to facilitate the proportional electromagnet to adjust the hydraulic diaphragm pump, a flow detection device is provided at the outlet of the hydraulic diaphragm pump. The flow detection device transmits the flow signal of the outlet to the central control system. The central control system calculates the required adjustment ratio according to the flow signal of the current pump body. The flow signal of the outlet flow meter is generally 4-20mA. If the signal is directly transmitted to the flow regulating device, the flow regulating device will not be able to respond. At this time, it is necessary to transmit the weak signal to the signal amplifier to convert the 4-20mA signal into a 0-1000mA signal that the proportional electromagnet can respond to. Subsequently, the amplified signal is transmitted to the flow regulating device, and the electromagnetic coil of the proportional electromagnet is energized to generate magnetic force. At the same time, the magnetic force overcomes the elastic force of the adjusting spring, so that the valve core moves away from the one-way valve, so that the hydraulic oil inside the hydraulic cylinder of the hydraulic diaphragm pump is diverted back to the oil chamber, reducing the stroke of the hydraulic oil pushing the diaphragm, thereby reducing the flow of the hydraulic diaphragm metering pump.

[0026] In addition, after the pump body has been used for a long time, impurities will inevitably appear in the hydraulic oil inside the pump body, which will cause blockage in the pump body, thereby reducing the operating efficiency of the pump. After the flow control device and the hydraulic diaphragm pump are installed, the width of the device's liquid inlet is narrow, so the liquid inlet of the one-way valve is prone to congestion. By providing a pressure detection device in the adjusting spring, generally speaking, when the liquid outlet of the flow control device is opened and the channel between the liquid inlet and the liquid outlet remains unobstructed, the passage of oil will generate thrust on the valve core, further causing the valve core to move in the direction of the adjusting spring, so that the adjusting spring receives pressure from the direction of the valve core. The higher the pressure, the lower the pressure. The larger the flow rate, if the channel between the liquid inlet and the liquid outlet is blocked at the same time, the flow rate will decrease accordingly, and the pressure on the adjusting spring will also decrease relatively. At this time, the minimum pressure value P is set. If the pressure value on the adjusting spring is less than P, it is judged that the device is blocked. The device first increases the flow rate in the pump body to increase the impact force of the oil on the blockage. If the pressure value on the adjusting spring is greater than P again, it is judged that the device is reopened. Otherwise, it means that the device is seriously blocked and staff needs to intervene to clean it up. By setting a pressure detection device, the blockage state of the device can be detected intelligently, which improves the working efficiency of the device and increases the safety of the pump body during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional view of a hydraulic diaphragm pump and a flow regulating device after installation according to an embodiment of an electric proportional flow regulating device for a hydraulic diaphragm pump and a control method thereof of the present invention;

[0028] Figure 2 A cross-sectional view of a flow regulating mechanism of an embodiment of an electric proportional flow regulating device for a hydraulic diaphragm pump and a control method thereof according to the present invention;

[0029] Figure 3It is a flow chart of a flow control method of an embodiment of an electric proportional flow control device for a hydraulic diaphragm pump and a control method thereof of the present invention;

[0030] Figure 4 A flow chart of blockage detection of an embodiment of an electric proportional flow control device for a hydraulic diaphragm pump and a control method thereof according to the present invention;

[0031] 1. Hydraulic diaphragm pump; 2. Flow regulating device; 3. Proportional electromagnet assembly; 31. Valve body; 32. Valve core; 33. Electromagnetic coil; 34. Guide sleeve; 35. Bearing; 36. Adjusting spring; 4. One-way valve assembly; 41. One-way valve seat; 42. Liquid inlet; 43. Liquid outlet; 44. Flow channel; 45. One-way valve ball; 46. One-way valve spring; 5. Limiting gasket; 6. U-ring; 7. O-ring; 8. Fastening screw; 9. Magnetic isolation ring; 10. Liquid cylinder; 11. Oil chamber; 12. Flow detection device; 13. Pressure detection device. DETAILED DESCRIPTION

[0032] Reference Figures 1 to 4 The present invention further describes an embodiment of an electric proportional flow control device for a hydraulic diaphragm pump and a control method thereof.

[0033] For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right" and the like are used in the embodiments to illustrate the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "on" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0034] Furthermore, relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0035] A hydraulic diaphragm pump electric proportional flow control device, comprising a hydraulic diaphragm pump 1, wherein the hydraulic diaphragm pump 1 is provided with a flow control device 2, wherein the flow control device 2 comprises a proportional electromagnetic assembly 3 and a one-way valve assembly 4, wherein the proportional electromagnetic assembly 3 comprises a valve body 31, a valve core 32 disposed in the valve body 31, and an electromagnetic coil 33 disposed on the periphery of the valve core 32, wherein a guide sleeve 34 is further provided between the valve core 32 and the electromagnetic coil 33, wherein a bearing 35 is further provided between the valve core 32 and the guide sleeve 34, wherein the valve core 32 rotates in the guide sleeve 34 via the bearing 35, wherein an adjusting spring 36 is further provided at one end of the valve core 32, wherein the adjusting spring 36 is configured to allow the valve core 32 to slide along its axial direction inside the valve body 31;

[0036] The one-way valve assembly 4 includes a one-way valve seat 41, a liquid inlet 42 and a liquid outlet 43 arranged on the one-way valve seat 41, the liquid inlet 42 is arranged at the bottom of the one-way valve seat 41, the liquid outlet 43 is arranged on the side wall of the one-way valve seat 41, the end of the valve core 32 away from the adjusting spring 36 is arranged inside the one-way valve seat 41, and at least blocks the liquid outlet 43, a flow channel 44 is provided between the liquid inlet 42 and the liquid outlet 43, a one-way valve ball 45 is provided in the flow channel 44, a one-way valve spring 46 is also provided between the one-way valve ball 45 and the valve core 32, the one-way valve ball 45 and the one-way valve spring 46 are used to push the valve core 32 and control the size of the opening of the liquid outlet 43.

[0037] A limiting gasket 5 and a U-shaped ring 6 are further provided between the valve core 32 and the valve body 31 .

[0038] The one-way valve seat 41 is provided with threads on its outer side, and the flow regulating device 2 is threadedly connected to the hydraulic diaphragm pump 1 via the one-way valve. An O-ring 7 is also sleeved on the outside of the one-way valve.

[0039] Preferably, after the flow regulating device 2 is connected to the hydraulic diaphragm pump 1 , the liquid inlet 42 of the one-way valve seat 41 is connected to the cylinder 10 of the hydraulic diaphragm pump 1 , and the liquid outlet 43 of the one-way valve seat 41 is connected to the oil chamber 11 of the hydraulic diaphragm pump 1 .

[0040] The valve body 31 is also provided with a fastening screw 8 , and the fastening screw 8 is used to enhance the connection strength between the flow regulating device 2 and the hydraulic diaphragm pump 1 .

[0041] A magnetic isolation ring 9 is also provided in the guide sleeve 34 .

[0042] The hydraulic end of the hydraulic diaphragm metering pump is precisely controlled and metered through the central control system, signal amplifier, flow detection device 12 and flow regulating device 2. The flow regulating device 2 is set as a proportional electromagnet and a one-way valve connected to the proportional electromagnet, so that the flow regulating device 2 can convert the flow electrical signal in the pump body into the displacement action of the valve core 32, thereby dynamically adjusting the size of the liquid outlet 43 of the one-way valve to achieve precise proportional flow output.

[0043] Furthermore, by arranging a one-way valve assembly 4 at one end of the electromagnet, the one-way valve assembly 4 includes a one-way valve seat 41, a liquid inlet 42 and a liquid outlet 43 arranged on the one-way valve seat 41, the liquid inlet 42 is arranged at the bottom of the one-way valve seat 41, and the liquid outlet 43 is arranged on the side wall of the one-way valve seat 41, and the end of the valve core 32 away from the adjusting spring 36 is arranged inside the one-way valve seat 41, and at least blocks the liquid outlet 43, so that the liquid outlet 43 remains normally closed under normal conditions. After the proportional electromagnet detects the flow change at the pump outlet end, the electromagnetic coil 33 generates magnetic force and controls the movement of the valve core 32, thereby opening the liquid outlet 43 to complete the proportional regulation of the flow.

[0044] The present application also provides a control method for an electric proportional flow control device of a hydraulic diaphragm pump, characterized in that it also includes a flow detection device 12, a central control system and a signal amplifier, wherein the flow detection device 12 is used to receive a flow signal and upload it to the central control system, and the signal amplifier is used to amplify a weak signal, and the control method includes the following steps: S1, the flow detection device detects a 4-20mA data signal of a flow meter at a pump outlet, and uploads the signal to the central control system;

[0045] S2, the central control system transmits the 4-20mA data signal to the signal amplifier according to the flow requirements;

[0046] S3, the signal amplifier amplifies the flow data to 0-1000mA and transmits the amplified signal to the flow regulating device;

[0047] S4. The flow regulating device controls the movement of the valve core and adjusts the stroke of the valve core so that the outlet of the one-way valve seat is opened, and the hydraulic oil in the hydraulic cylinder of the hydraulic diaphragm pump is diverted back to the oil chamber.

[0048] Preferably, a pressure detection device 13 is further provided in the regulating spring 36, and the step S4 also includes pump body blockage detection, including the following steps: S41, after the valve core is adjusted, the central control system sets the valve core pressure detection lower limit value P;

[0049] S42, the pressure detection device continuously detects the pressure value of the regulating spring, and the detection time is T;

[0050] S43, after the T time period, the pressure detection device detects that the pressure value of the regulating spring is P1;

[0051] S44, if P1>P, it is judged that the pump body is operating normally, the device continues to operate, and jumps back to S42 to continue testing. Otherwise, it jumps to S45 to continue testing;

[0052] S45, if P1≤P, the pump is judged to be blocked, and the central control system increases the speed of the pump and continues to run for T1 time;

[0053] S46, after T1 time, the pressure P2 of the pressure detection device is detected again. If P2>P, it is determined that the pump body is operating normally, the device continues to operate, and jumps back to S42 to continue detection. Otherwise, it jumps to S47 to continue detection;

[0054] S47. If P2≤P, the pump body is judged to be seriously blocked, the device stops running, and the staff is notified to repair it.

[0055] In order to facilitate the proportional electromagnet to adjust the hydraulic diaphragm pump 1, a flow detection device 12 is provided at the liquid outlet 43 of the hydraulic diaphragm pump 1. The flow detection device 12 transmits the flow signal of the outlet to the central control system. The central control system calculates the required adjustment ratio according to the flow signal of the current pump body. The flow signal of the outlet flow meter is generally 4-20mA. If the signal is directly transmitted to the flow regulating device 2, the flow regulating device 2 will not be able to respond. At this time, it is necessary to transmit the weak signal to the signal amplifier to convert the 4-20mA signal into a 0-1000mA signal that the proportional electromagnet can respond to. Subsequently, the amplified signal is transmitted to the flow regulating device 2, and the electromagnetic coil 33 of the proportional electromagnet is energized to generate magnetic force. At the same time, the magnetic force overcomes the elastic force of the adjusting spring 36, so that the valve core 32 moves away from the one-way valve, so that the hydraulic oil inside the cylinder 10 of the hydraulic diaphragm pump 1 is diverted back to the oil chamber 11, reducing the stroke of the hydraulic oil pushing the diaphragm, thereby reducing the flow of the hydraulic diaphragm metering pump.

[0056] Furthermore, after the pump body has been used for a long time, impurities will inevitably appear in the hydraulic oil inside the pump body, which will cause blockage in the pump body, thereby reducing the operating efficiency of the pump. Since the width of the device liquid inlet 42 is narrow after the flow regulating device 2 and the hydraulic diaphragm pump 1 are installed, congestion is likely to occur at the liquid inlet 42 of the one-way valve. By providing a pressure detection device 13 in the regulating spring 36, generally speaking, when the liquid outlet 43 of the flow regulating device 2 is opened and the channel between the liquid inlet 42 and the liquid outlet 43 is kept unobstructed, the passage of oil will generate thrust on the valve core 32, further causing the valve core 32 to move in the direction of the regulating spring 36, so that the regulating spring 36 receives pressure from the direction of the valve core 32. The pressure is increased, the greater the pressure, the greater the flow rate. If the channel between the liquid inlet 42 and the liquid outlet 43 is blocked at the same time, the flow rate will be reduced accordingly, and the pressure on the adjusting spring 36 will also be relatively reduced. At this time, the minimum pressure value P is set. If the pressure value on the adjusting spring 36 is less than P, it is judged that the device is blocked. The device first increases the flow rate in the pump body to increase the impact force of the oil on the blocked part. If the pressure value on the adjusting spring 36 is greater than P again, it is judged that the device is reopened. Otherwise, it means that the device is seriously blocked and staff needs to intervene to clean it up. By setting the pressure detection device 13, the blockage state of the device can be intelligently detected, the working efficiency of the device is improved, and the safety of the pump body during operation is increased.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A control method for a hydraulic diaphragm pump electric proportional flow control device, comprising a hydraulic diaphragm pump (1), characterized in that: The hydraulic diaphragm pump (1) is provided with a flow regulating device (2), the flow regulating device (2) comprising a proportional electromagnetic assembly (3) and a one-way valve assembly (4), the proportional electromagnetic assembly (3) comprising a valve body (31), a valve core (32) arranged in the valve body (31), and an electromagnetic coil (33) arranged on the circumference of the valve core (32), a guide sleeve (34) is provided between the valve core (32) and the electromagnetic coil (33), a bearing (35) is provided between the valve core (32) and the guide sleeve (34), the valve core (32) rotates in the guide sleeve (34) through the bearing (35), and an adjusting spring (36) is provided at one end of the valve core (32), the adjusting spring (36) is configured to allow the valve core (32) to slide along its axial direction inside the valve body (31); The one-way valve assembly (4) comprises a one-way valve seat (41), a liquid inlet (42) and a liquid outlet (43) arranged on the one-way valve seat (41); the liquid inlet (42) is arranged at the bottom of the one-way valve seat (41); the liquid outlet (43) is arranged on the side wall of the one-way valve seat (41); one end of the valve core (32) away from the regulating spring (36) is arranged inside the one-way valve seat (41) and at least blocks the liquid outlet (43); a flow channel (44) is arranged between the liquid inlet (42) and the liquid outlet (43); a one-way valve ball (45) is arranged in the flow channel (44); and a one-way valve spring (46) is also arranged between the one-way valve ball (45) and the valve core (32); The control method comprises the following steps: S1, a flow detection device detects a 4-20mA data signal of a flow meter at a pump outlet, and uploads the signal to a central control system; S2, the central control system transmits the 4-20mA data signal to the signal amplifier according to the flow requirements; S3, the signal amplifier amplifies the flow data to 0-1000mA and transmits the amplified signal to the flow regulating device; S4, the flow regulating device controls the movement of the valve core and adjusts the stroke of the valve core so that the outlet of the one-way valve seat is opened, and the hydraulic oil in the hydraulic cylinder of the hydraulic diaphragm pump is diverted back to the oil chamber; The step S4 also includes pump body blockage detection, including the following steps: S41, after the valve core is adjusted, the central control system sets the valve core pressure detection lower limit value P; S42, the pressure detection device continuously detects the pressure value of the regulating spring, and the detection time is T; S43, after the T time period, the pressure detection device detects that the pressure value of the regulating spring is P1; S44, if P1>P, it is judged that the pump body is operating normally, the device continues to operate, and jumps back to S42 to continue testing. Otherwise, it jumps to S45 to continue testing; S45, if P1≤P, the pump is judged to be blocked, and the central control system increases the speed of the pump and continues to run for T1 time; S46, after T1 time, the pressure P2 of the pressure detection device is detected again. If P2>P, it is determined that the pump body is operating normally, the device continues to operate, and jumps back to S42 to continue detection. Otherwise, it jumps to S47 to continue detection; S47. If P2≤P, the pump body is judged to be seriously blocked, the device stops running, and the staff is notified to repair it.

2. A control method for a hydraulic diaphragm pump electric proportional flow control device according to claim 1, characterized in that: A limiting gasket (5) and a U-shaped ring (6) are also provided between the valve core (32) and the valve body (31).

3. The control method of the hydraulic diaphragm pump electric proportional flow control device according to claim 1, characterized in that: The one-way valve seat (41) is provided with a thread on the outside, the flow regulating device (2) is threadedly connected to the hydraulic diaphragm pump (1) via the one-way valve, and the one-way valve is also covered with an O-type sealing ring (7).

4. The control method of the hydraulic diaphragm pump electric proportional flow control device according to claim 1, characterized in that: The valve body (31) is also provided with a fastening screw (8), and the fastening screw (8) is used to enhance the connection strength between the flow regulating device (2) and the hydraulic diaphragm pump (1).

5. The control method of the hydraulic diaphragm pump electric proportional flow control device according to claim 1, characterized in that: A magnetic isolation ring (9) is also provided inside the guide sleeve (34).

6. A control method for a hydraulic diaphragm pump electric proportional flow control device according to claim 3, characterized in that: After the flow regulating device (2) is connected to the hydraulic diaphragm pump (1), the liquid inlet (42) of the one-way valve seat (41) is connected to the liquid cylinder (10) of the hydraulic diaphragm pump (1), and the liquid outlet (43) of the one-way valve seat (41) is connected to the oil chamber (11) of the hydraulic diaphragm pump (1).

7. A control method for a hydraulic diaphragm pump electric proportional flow control device according to claim 1, characterized in that: The hydraulic diaphragm pump (1) further comprises a flow detection device (12), a central control system and a signal amplifier, wherein the flow detection device (12) is used to receive a flow signal and upload it to the central control system, and the signal amplifier is used to amplify a weak signal.

8. The control method of the electric proportional flow control device of a hydraulic diaphragm pump according to claim 1, characterized in that: A pressure detection device (13) is also provided inside the regulating spring (36).

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