Compact electric servo pump control system based on electric servo pump control unit

Abstract

The utility model provides a compact type electric servo pump control system based on an electric servo pump control unit, which relates to electro-hydraulic servo testing equipment and comprises the electric servo pump control unit, an action execution unit, a control valve group, a cooling oil supplementing pump station and a controller. The action execution unit is controlled to move through a first oil path and a second oil path of the control valve group; the cooling and oil supplementing pump station is connected to the control valve set, cools the electric servo pump control unit through a third oil way and a fourth oil way of the control valve set, supplements oil to the pump control system through a fifth oil way, controls the displacement of the electric servo pump control unit through a sixth oil way and recycles oil through a seventh oil way. The controller collects system pressure and position feedback signals and controls the rotating speed of the electric servo pump control unit through the feedback signals, and the system has the advantages of being good in expandability and variability, ultrahigh in energy efficiency and almost free of abrasion operation.

Description

Technical Field

[0001] This utility model relates to an electro-hydraulic servo testing device, and more particularly to a compact electric servo pump control system based on an electric servo pump control unit. Background Technology

[0002] Traditional hydraulic transmission systems are mostly valve-controlled open-loop systems. Their characteristic is that the hydraulic pump draws oil from the tank, which then passes through a control valve to the actuator. The return oil from the actuator returns to the tank via the control valve, where the oil is cooled, air is separated, and impurities are settled before re-entering the working cycle. Valve-controlled open-loop systems have a simple structure, but external air can easily enter the system through the tank, leading to unstable actuator movement and adverse consequences. Pump-controlled closed-loop systems are more energy-efficient hydraulic transmission systems. Their characteristic is that the pressurized oil output from the hydraulic pump goes directly to the actuator, and the return oil from the actuator returns directly to the pump's suction chamber. Pump-controlled closed-loop systems have a complex structure, with the oil circulating in a closed loop, resulting in a larger oil temperature rise. They also typically require oil replenishment and cooling, thus increasing costs.

[0003] Servo motors are commonly used in the field of testing equipment technology to meet high precision requirements. However, servo motors are often unsuitable for some testing applications that require high precision and large output. On the other hand, using traditional valve-controlled open hydraulic systems or pump-controlled closed hydraulic systems has problems such as poor environmental performance, large footprint, and low control precision. Utility Model Content

[0004] To address the aforementioned technical problems, the purpose of this utility model is to provide a compact electric servo pump control system based on an electric servo pump control unit. This system solves the problems of low output from a single servo motor, poor environmental performance, large footprint, and low control precision in a single hydraulic system. Specifically, the electric servo pump control unit provides precise servo power, which, combined with the motion execution unit, control valve group, and cooling oil replenishment pump station, forms a compact electric servo pump control system capable of position, pressure / force, and speed control. It has the advantages of good scalability, variability, ultra-high energy efficiency, and virtually wear-free operation.

[0005] This utility model provides the following technical solution:

[0006] A compact electric servo pump control system based on an electric servo pump control unit includes an electric servo pump control unit, an action execution unit, a control valve group, a cooling oil replenishment pump station, and a controller. The electric servo pump control unit, the action execution unit, and the cooling oil replenishment pump station are all connected to the control valve group. The electric servo pump control unit drives the action execution unit through the control valve group. The cooling oil replenishment pump station cools, replenishes oil, and regulates the displacement of the electric servo pump control unit through the control valve group. The controller collects feedback signals and adjusts the electric servo pump control unit, the control valve group, and the cooling oil replenishment pump station. The electric servo pump control unit includes a servo motor, a radial piston pump, and oil ports six and seven. The radial piston pump has an inclined plate for adjusting the displacement. The control valve group includes a first oil chamber and a second oil chamber; the control valve group includes a first oil circuit, a second oil circuit, a third oil circuit, a fourth oil circuit, a fifth oil circuit, a sixth oil circuit, a seventh oil circuit, and oil ports one, two, three, four, five, eight, nine, and ten; the cooling oil replenishment pump station is connected to the third, fourth, fifth, and sixth oil circuits through oil port one for cooling and oil replenishment, and is connected to the seventh oil circuit through oil port two for oil recovery.

[0007] Preferably, the first oil circuit connects the electric servo pump control unit and the action execution unit through the oil port three and the first oil chamber, and the first oil circuit is provided with an electromagnetic reversing valve one for connecting or disconnecting the first oil circuit; the second oil circuit connects the electric servo pump control unit and the action execution unit through the oil port four and the second oil chamber, and the second oil circuit is provided with an electromagnetic reversing valve two for connecting or disconnecting the second oil circuit; the third oil circuit is provided with a throttling port one for throttling and an external hose one, the third oil circuit is connected to the oil port six of the servo motor through the oil port five, and the cooling oil, after passing through the servo motor, is connected to the oil port ten through the oil port seven and the external hose two; the fourth oil circuit is provided with a throttling port one for throttling. The flow is throttled at port two. The fourth oil circuit is connected to the radial piston pump via port eight. Cooling oil passes through the radial piston pump and is then connected to port nine. A one-way valve three is provided on the fifth oil circuit. The fifth oil circuit is connected to the first oil circuit via one-way valve one and to the second oil circuit via one-way valve two, thereby replenishing oil to the pump control system. A one-way valve four is provided on the sixth oil circuit. The sixth oil circuit is connected to the swashplate on the radial piston pump via the solenoid directional valve three. The seventh oil circuit recovers the cooling oil from the third and fourth oil circuits via ports nine and ten, recovers the control oil from the swashplate via the solenoid directional valve three, and recovers the replenishing oil from the fifth oil circuit via the needle valve and the overflow valve three.

[0008] Preferably, a pressure sensor is provided on the first oil line, a pressure sensor is provided on the second oil line, a pressure sensor is provided on the fifth oil line, a temperature sensor is provided on the seventh oil line, and the position sensor is provided on the action execution unit; the pressure, temperature and position feedback signals of the sensors are all transmitted to the controller (5) to adjust the speed of the electric servo pump control unit (1).

[0009] Preferably, the first oil circuit and the second oil circuit are respectively provided with the first overflow valve and the second overflow valve; one end of the first overflow valve is connected to the first oil circuit and the other end is connected to the first oil port, and the control port of the first overflow valve is connected to the first oil circuit; one end of the second overflow valve is connected to the second oil circuit and the other end is connected to the first oil port, and the control port of the second overflow valve is connected to the second oil circuit.

[0010] Preferably, the fifth oil circuit is provided with the needle valve, the overflow valve three, and the accumulator; one end of the needle valve is connected to the fifth oil circuit, and the other end is connected to the seventh oil circuit; one end of the overflow valve three is connected to the fifth oil circuit, and the other end is connected to the seventh oil circuit, and the control port of the overflow valve three is connected to the fifth oil circuit.

[0011] Preferably, the sixth oil line is provided with the shuttle valve and the electromagnetic directional valve three; one end of the shuttle valve is connected to the first oil line, the other end is connected to the second oil line, and the outlet end is connected to the first oil port of the electromagnetic directional valve three; the electromagnetic directional valve three is a two-position four-way directional valve, including four oil ports and two positions, and the second oil port of the electromagnetic directional valve three is connected to the seventh oil line; in the first position, the third oil port and the fourth oil port of the electromagnetic directional valve three are respectively connected to the large end Xmax and the small end Xmin of the swashplate, and in the second position, the third oil port and the fourth oil port of the electromagnetic directional valve three are respectively connected to the small end Xmin and the large end Xmax of the swashplate.

[0012] Preferably, the one-way valve three only allows oil to flow from the oil port one to the fifth oil passage; the one-way valve four only allows oil to flow from the oil port one to the sixth oil passage; the one-way valve one only allows oil to flow from the fifth oil passage to the first oil passage; and the one-way valve two only allows oil to flow from the fifth oil passage to the second oil passage.

[0013] Preferably, the pump control system further includes the valve block, wherein the first oil circuit, the second oil circuit, the third oil circuit, the fourth oil circuit, the fifth oil circuit, the sixth oil circuit, and the seventh oil circuit are all internal oil passages of the valve block; the first overflow valve, the second overflow valve, the third overflow valve, the needle valve, the accumulator, the first electromagnetic directional valve, the second electromagnetic directional valve, the third electromagnetic directional valve, the first check valve, the second check valve, the third check valve, the fourth check valve, the shuttle valve, the first throttle port, the second throttle port, the first pressure sensor, the second pressure sensor, the third pressure sensor, and the temperature sensor are all mounted on the valve block.

[0014] By adopting the above technical solution, the electric servo pump control unit, which combines a servo motor and a radial piston pump, becomes the hydraulic power element of the pump-controlled closed hydraulic system. The speed is then regulated and the oil circuit is switched through the controller and control valve group to control the action execution unit to complete the action process. Finally, an external cooling oil replenishment pump station replenishes oil to the entire system and cools the electric servo pump control unit.

[0015] The beneficial effects of this utility model are:

[0016] 1. The electric servo pump control unit combines the advantages of electricity, hydraulics and servo, and has the characteristics of compact structure, high precision and large output. It can improve the shortcomings of traditional single servo motor or single hydraulic system in the field of test equipment technology.

[0017] 2. The compact electric servo pump control system combines an electric servo pump control unit with a control valve group, resulting in a compact overall structure, small footprint, and the ability to meet the needs of various testing conditions. The external power actuator, cooling oil replenishment pump station, and controller are easier to move and assemble, and can provide various layout options.

[0018] 3. The compact electric servo pump control system combines the advantages of electric servo and closed hydraulic systems. Its main features are green environmental protection, ultra-high energy efficiency and virtually wear-free operation. At the same time, it can also meet the unique application needs of multiple industries by optimizing and modifying the control valve group. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a hydraulic schematic diagram of a compact electric servo pump control system based on an electric servo pump control unit according to an embodiment of this application.

[0021] Figure 2 This is an embodiment of the present application. Figure 1 A schematic diagram of the structure of a compact electric servo pump control system based on an electric servo pump control unit;

[0022] Figure 3 This is an embodiment of the present application. Figure 2 A schematic diagram of the structure of the electric servo pump control unit and control valve assembly described above;

[0023] Markings in the diagram:

[0024] 1. Electric servo pump control unit; 2. Action execution unit; 3. Control valve group; 4. Cooling oil replenishment pump station; 5. Controller; 11. Servo motor; 12. Radial piston pump; 21. First oil chamber; 22. Second oil chamber; 23. Position sensor; 31. First oil circuit; 32. Second oil circuit; 33. Third oil circuit; 34. Fourth oil circuit; 35. Fifth oil circuit; 36. Sixth oil circuit; 37. Seventh oil circuit; 38. Valve block; 41. Oil port one; 42. Oil port two; 121. Swashplate; 311. Relief valve one; 312. Solenoid directional valve one; 313. Check valve one; 314. Pressure sensor one; 315. Oil port 3; 321. Overflow valve 2; 322. Solenoid directional valve 2; 323. Check valve 2; 324. Pressure sensor 2; 325. Oil port 4; 331. Throttling port 1; 332. Oil port 5; 333. Hose 1; 334. Oil port 6; 335. Oil port 7; 336. Hose 2; 341. Throttling port 2; 342. Oil port 8; 351. Check valve 3; 352. Needle valve; 353. Overflow valve 3; 354. Accumulator; 355. Pressure sensor 3; 361. Check valve 4; 362. Shuttle valve; 363. Solenoid directional valve 3; 371. Oil port 9; 372. Oil port 10; 373. Temperature sensor. Detailed Implementation

[0025] The following embodiments are in conjunction with the appendix Figure 1 , 2 Section 3 provides a further detailed description of this application. Embodiments of this application disclose a compact electric servo pump control system based on an electric servo pump control unit.

[0026] Reference Figure 1 The compact electric servo pump control system includes an electric servo pump control unit 1, an action execution unit 2, a control valve group 3, a cooling oil replenishment pump station 4, and a controller 5. The electric servo pump control unit 1 includes a servo motor 11, a radial piston pump 12, and oil ports 6 (334) and 7 (335). The radial piston pump 12 has a swashplate 121 for adjusting the displacement. The action execution unit 2 includes a first oil chamber 21 and a second oil chamber 22. The control valve group 3 includes a first oil passage 31, a second oil passage 32, a third oil passage 33, a fourth oil passage 34, a fifth oil passage 35, a sixth oil passage 36, a seventh oil passage 37, and oil ports 1 (41), 2 (42), 3 (315), 4 (325), 5 (332), 8 (342), 9 (371), and 10 (372). The cooling oil replenishment pump station 4 is connected to the third oil passage 33, the fourth oil passage 34, the fifth oil passage 35, and the sixth oil passage 36 through oil port 1 (41) for cooling and oil replenishment, and is connected to the seventh oil passage 37 through oil port 2 (42) for oil recovery.

[0027] Reference Figure 1The first oil circuit 31 connects to the electric servo pump control unit 1 and the action execution unit 2 via oil port 315 and the first oil chamber 21. The first oil circuit 31 is equipped with a solenoid directional valve 312 to connect or disconnect the first oil circuit 31. The second oil circuit 32 connects to the electric servo pump control unit 1 and the action execution unit 2 via oil port 425 and the second oil chamber 22. The second oil circuit 32 is equipped with a solenoid directional valve 322 to connect or disconnect the second oil circuit 32. The third oil circuit 33 is equipped with a throttling port 331 for throttling and an external hose 333. The third oil circuit 33 is connected to the servo motor 11 via oil port 634 via oil port 532. The cooling oil passes through the servo motor 11 and is connected to oil port 372 via oil port 735 and an external hose 336. The fourth oil circuit 34 is equipped with a throttling port 341 for throttling. The fourth oil passage 34 is connected to the radial piston pump 12 via port 8 342. After passing through the radial piston pump 12, the cooling oil is connected to port 9 371. The fifth oil passage 35 is equipped with a check valve 351. The fifth oil passage 35 is connected to the first oil passage 31 via check valve 1 313 and to the second oil passage 32 via check valve 2 323, thereby replenishing the pump control system with oil. The sixth oil passage 36 is equipped with a check valve 4 361. The sixth oil passage 36 is connected to the swashplate 121 on the radial piston pump 12 via a solenoid directional valve 363. The seventh oil passage 37 recovers the cooling oil from the third oil passage 33 and the fourth oil passage 34 via port 9 371 and port 10 372, recovers the control oil from the swashplate 121 via the solenoid directional valve 363, and recovers the replenishing oil from the fifth oil passage 35 via the needle valve 352 and the overflow valve 353.

[0028] Reference Figure 1 Pressure sensor 314 is installed on the first oil circuit 31, pressure sensor 324 is installed on the second oil circuit 32, pressure sensor 355 is installed on the fifth oil circuit 35, temperature sensor 373 is installed on the seventh oil circuit 37, and position sensor 23 is installed on the action execution unit 2. The pressure, temperature and position feedback signals of the sensors are all transmitted to the controller 5 to adjust the speed of the electric servo pump control unit 1.

[0029] Reference Figure 1 The first oil passage 31 and the second oil passage 32 are respectively equipped with an overflow valve 311 and an overflow valve 321; one end of the overflow valve 311 is connected to the first oil passage 31 and the other end is connected to the oil port 41, and the control port of the overflow valve 311 is connected to the first oil passage 31; one end of the overflow valve 321 is connected to the second oil passage 32 and the other end is connected to the oil port 41, and the control port of the overflow valve 321 is connected to the second oil passage 32.

[0030] Reference Figure 1The fifth oil circuit 35 is equipped with a needle valve 352, an overflow valve 353 and an accumulator 354; one end of the needle valve 352 is connected to the fifth oil circuit 35 and the other end is connected to the seventh oil circuit 37; one end of the overflow valve 353 is connected to the fifth oil circuit 35 and the other end is connected to the seventh oil circuit 37, and the control port of the overflow valve 353 is connected to the fifth oil circuit 35.

[0031] Reference Figure 1 The sixth oil passage 36 is equipped with a shuttle valve 362 and a solenoid directional valve 363. One end of the shuttle valve 362 is connected to the first oil passage 31, the other end is connected to the second oil passage 32, and the outlet end is connected to the first oil port of the solenoid directional valve 363. The solenoid directional valve 363 is a two-position four-way directional valve, including four oil ports and two positions. The second oil port of the solenoid directional valve 363 is connected to the seventh oil passage 37. In the first position, the third and fourth oil ports of the solenoid directional valve 363 are connected to the large end Xmax and the small end Xmin of the swashplate 121, respectively. In the second position, the third and fourth oil ports of the solenoid directional valve 363 are connected to the small end Xmin and the large end Xmax of the swashplate 121, respectively.

[0032] Reference Figure 1 Check valve 351 only allows oil to flow from port 41 to the fifth oil passage 35; check valve 461 only allows oil to flow from port 41 to the sixth oil passage 36; check valve 13 only allows oil to flow from the fifth oil passage 35 to the first oil passage 31; check valve 2323 only allows oil to flow from the fifth oil passage 35 to the second oil passage 32.

[0033] Reference Figure 2 The electric servo pump control unit 1 is located on the control valve group 3. The action execution unit 2 and the cooling oil replenishment pump station 4 are both connected to the control valve group 3 through external pipelines for easy movement and combination. The controller 5 collects feedback signals and adjusts the speed of the electric servo pump control unit 1 and the cooling oil replenishment pump station 4, as well as the opening and closing of the solenoid valve of the control valve group 3, thereby completing the movement of the action execution unit 2.

[0034] Reference Figure 3The electric servo pump control unit 1 and the control valve group 3 are connected by bolts, making the overall structure more compact. The control valve group 3 is composed of valve block 38 and various cartridge valves. The first oil passage 31, the second oil passage 32, the third oil passage 33, the fourth oil passage 34, the fifth oil passage 35, the sixth oil passage 36 and the seventh oil passage 37 are all internal oil passages of valve block 38. Overflow valve 1 311, overflow valve 2 321, overflow valve 3 353, needle valve 352, accumulator 354, electromagnetic directional valve 1 312, electromagnetic directional valve 2 322, electromagnetic directional valve 3 363, check valve 1 313, check valve 2 323, check valve 3 351, check valve 4 361, shuttle valve 362, throttle port 1 331, throttle port 2 341, pressure sensor 1 314, pressure sensor 2 324, pressure sensor 3 355 and temperature sensor 373 are all installed on valve block 38.

[0035] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A compact electric servo pump control system based on an electric servo pump control unit, characterized in that, The system includes an electric servo pump control unit (1), an action execution unit (2), a control valve group (3), a cooling oil replenishment pump station (4), and a controller (5). The electric servo pump control unit (1), the action execution unit (2), and the cooling oil replenishment pump station (4) are all connected to the control valve group (3). The electric servo pump control unit (1) drives the action execution unit (2) through the control valve group (3). The cooling oil replenishment pump station (4) cools, replenishes oil, and adjusts the displacement of the electric servo pump control unit (1) through the control valve group (3). The controller (5) is used to collect feedback signals and adjust the electric servo pump control unit (1), the control valve group (3), and the cooling oil replenishment pump station (4). The electric servo pump control unit (1) includes a servo motor (11), a radial piston pump (12), and oil ports six (334) and seven (335). The radial piston pump (12) has a swashplate (121) for adjusting the displacement. The action execution unit (2) includes a first oil chamber (21) and a second oil chamber (22). The control valve group (3) includes a first oil passage (31), a second oil passage (32), a third oil passage (33), a fourth oil passage (34), a fifth oil passage (35), a sixth oil passage (36), and a seventh oil passage (37). 37) and oil port 1 (41), oil port 2 (42), oil port 3 (315), oil port 4 (325), oil port 5 (332), oil port 8 (342), oil port 9 (371), oil port 10 (372); the cooling oil replenishment pump station (4) is connected to the third oil circuit (33), the fourth oil circuit (34), the fifth oil circuit (35) and the sixth oil circuit (36) through oil port 1 (41) for cooling and oil replenishment, and is connected to the seventh oil circuit (37) through oil port 2 (42) for oil recovery.

2. The compact electric servo pump control system based on an electric servo pump control unit according to claim 1, characterized in that, The first oil circuit (31) connects the electric servo pump control unit (1) and the action execution unit (2) through the oil port three (315) and the first oil chamber (21). The first oil circuit (31) is equipped with an electromagnetic reversing valve one (312) to connect or disconnect the first oil circuit (31). The second oil circuit (32) connects the electric servo pump control unit (1) and the action execution unit (2) through the oil port four (325) and the second oil chamber (22). The second oil circuit (32) is equipped with an electromagnetic reversing valve one (312) to connect or disconnect the first oil circuit (31). The second electromagnetic reversing valve (322) of the second oil circuit (32); the third oil circuit (33) is provided with a throttling port (331) for throttling and an external hose (333), the third oil circuit (33) is connected to the servo motor (11) via the oil port (334) through the oil port (5) (332), the cooling oil passes through the servo motor (11) and is connected to the oil port (372) through the oil port (7) (335) and the external hose (336); the fourth oil circuit (34) is provided with a throttling port (2) for throttling. (341), the fourth oil passage (34) is connected to the radial plunger pump (12) through the oil port eight (342), and the cooling oil is connected to the oil port nine (371) after passing through the radial plunger pump (12); the fifth oil passage (35) is provided with a one-way valve three (351), the fifth oil passage (35) is connected to the first oil passage (31) through one-way valve one (313), and connected to the second oil passage (32) through one-way valve two (323), thereby replenishing oil to the pump control system; the sixth oil passage (36) is provided with a one-way valve four ( 361), the sixth oil circuit (36) is connected to the swashplate (121) on the radial piston pump (12) via the electromagnetic reversing valve three (363); the seventh oil circuit (37) recovers the cooling oil of the third oil circuit (33) and the fourth oil circuit (34) through the oil port nine (371) and the oil port ten (372), recovers the control oil of the swashplate (121) through the electromagnetic reversing valve three (363), and recovers the replenishing oil of the fifth oil circuit (35) through the needle valve (352) and the overflow valve three (353).

3. A compact electric servo pump control system based on an electric servo pump control unit according to claim 2, characterized in that, The first oil circuit (31) is equipped with a pressure sensor 1 (314), the second oil circuit (32) is equipped with a pressure sensor 2 (324), the fifth oil circuit (35) is equipped with a pressure sensor 3 (355), the seventh oil circuit (37) is equipped with a temperature sensor (373), and the action execution unit (2) is equipped with a position sensor (23). The pressure, temperature and position feedback signals of the sensors are all transmitted to the controller (5) to adjust the speed of the electric servo pump control unit (1).

4. A compact electric servo pump control system based on an electric servo pump control unit according to claim 3, characterized in that, The first oil circuit (31) and the second oil circuit (32) are respectively provided with overflow valve one (311) and overflow valve two (321); one end of the overflow valve one (311) is connected to the first oil circuit (31), the other end of the overflow valve one (311) is connected to the oil port one (41), and the control port of the overflow valve one (311) is connected to the first oil circuit (31); one end of the overflow valve two (321) is connected to the second oil circuit (32), the other end of the overflow valve two (321) is connected to the oil port one (41), and the control port of the overflow valve two (321) is connected to the second oil circuit (32).

5. A compact electric servo pump control system based on an electric servo pump control unit according to claim 4, characterized in that, The fifth oil circuit (35) is equipped with a needle valve (352), the third overflow valve (353) and an accumulator (354). One end of the needle valve (352) is connected to the fifth oil circuit (35), and the other end of the needle valve (352) is connected to the seventh oil circuit (37). One end of the third overflow valve (353) is connected to the fifth oil circuit (35), and the other end of the third overflow valve (353) is connected to the seventh oil circuit (37). The control port of the third overflow valve (353) is connected to the fifth oil circuit (35).

6. A compact electric servo pump control system based on an electric servo pump control unit according to claim 5, characterized in that, The sixth oil passage (36) is equipped with a shuttle valve (362) and a third electromagnetic directional valve (363); one end of the shuttle valve (362) is connected to the first oil passage (31), the other end of the shuttle valve (362) is connected to the second oil passage (32), and the outlet end is connected to the first oil port of the third electromagnetic directional valve (363); the third electromagnetic directional valve (363) is a two-position four-way directional valve, including four oil ports and two positions, and the second oil port of the third electromagnetic directional valve (363) is connected to the seventh oil passage (37); in the first position, the third oil port and the fourth oil port of the third electromagnetic directional valve (363) are respectively connected to the large end Xmax and the small end Xmin of the swashplate (121), and in the second position, the third oil port and the fourth oil port of the third electromagnetic directional valve (363) are respectively connected to the small end Xmin and the large end Xmax of the swashplate (121).

7. A compact electric servo pump control system based on an electric servo pump control unit according to claim 2, characterized in that, The one-way valve three (351) only allows oil to flow from the oil port one (41) to the fifth oil passage (35); the one-way valve four (361) only allows oil to flow from the oil port one (41) to the sixth oil passage (36); the one-way valve one (313) only allows oil to flow from the fifth oil passage (35) to the first oil passage (31); and the one-way valve two (323) only allows oil to flow from the fifth oil passage (35) to the second oil passage (32).

8. A compact electric servo pump control system based on an electric servo pump control unit according to claim 6, characterized in that, The pump control system also includes a valve block (38), wherein the first oil passage (31), the second oil passage (32), the third oil passage (33), the fourth oil passage (34), the fifth oil passage (35), the sixth oil passage (36), and the seventh oil passage (37) are all internal oil passages of the valve block (38); the first overflow valve (311), the second overflow valve (321), the third overflow valve (353), the needle valve (352), the accumulator (354), and the first electromagnetic reversing valve (312) are also included. The electromagnetic reversing valve 2 (322), the electromagnetic reversing valve 3 (363), the one-way valve 1 (313), the one-way valve 2 (323), the one-way valve 3 (351), the one-way valve 4 (361), the shuttle valve (362), the throttle port 1 (331), the throttle port 2 (341), the pressure sensor 1 (314), the pressure sensor 2 (324), the pressure sensor 3 (355), and the temperature sensor (373) are all mounted on the valve block (38).

Images