Servo motor pump cluster type high-power electrically-driven hydraulic actuator

Abstract

The invention relates to a servo motor pump cluster type high-power electrically-driven hydraulic actuator, and belongs to the technical field of servo mechanisms. Comprising n servo motor pumps, a first oil supplementing one-way valve, a second oil supplementing one-way valve, a first hydraulic control one-way valve, a second hydraulic control one-way valve, a first safety valve, a second safety valve, a bypass valve, a first high-pressure pressure sensor, a second high-pressure pressure sensor, a low-pressure pressure sensor, a filling valve, a pressurizing oil tank and a hydraulic cylinder. N is a positive integer not less than 10; by adopting the scheme of a servo motor pump cluster, the number of motor pumps in a previous multi-redundancy static pressure actuator is increased from 2 to 10 or more, and the problem of electrokinematization of a super-power hydraulic actuator is solved. Compared with a traditional valve-controlled hydraulic actuator, the problems of an ultra-large-flow servo valve and an ultra-high-power hydraulic pump station are solved. The ultra-high-power electric actuator meets the requirement of the ultra-high-power electric actuator of hundreds of kilowatts or above, and meanwhile has the advantages of being high in heavy load capacity and impact resistance, compact in structural size and electric.

Description

Technical Field

[0001] The invention belongs to the technical field of servo mechanisms and relates to a servo motor pump cluster type high-power electrically driven hydraulic actuator. Background Art

[0002] As a new type of electric actuator technology solution, electric-driven hydraulic actuators are widely used in advanced aircraft in the foreign aviation field due to their advantages such as heavy-load capacity and strong impact resistance, easy redundancy, high reliability, energy saving and high efficiency. Domestic scientific research institutes have been tracking the development of technology for many years, and have achieved certain results in theoretical research and prototype trial production, and have begun engineering application demonstration in the fields of aviation, aerospace, and navigation. Electric-driven hydraulic actuators in the fields of aviation, aerospace, and navigation pursue high reliability, high dynamic characteristics, and high power density. Generally, they adopt redundancy solutions for systems or key components, such as dual-redundancy and triple-redundancy architectures, to solve the reliability problem of the system. In addition, structural integration solutions are adopted to solve the problem of high power density. However, at present, electric-driven hydraulic actuators in the fields of aerospace and navigation at home and abroad use a maximum of four-redundancy design solutions to solve the problem of system reliability.

[0003] With the social demand and technological development trend of electrification, energy conservation and environmental protection, the actuators of civil engineering equipment must also be developed in the direction of electrification, energy conservation and environmental protection. The electric-driven hydraulic actuator adopts efficient power electronic drive combined with the time-tested hydraulic transmission in engineering machinery. It is an excellent electric actuation system solution at this stage. In the face of the current demand for heavy-load and ultra-high-power electric actuators, foreign universities and enterprises have developed a variety of electric-driven hydraulic actuators. Taking into account the low-cost requirements of the civil market, the current electric-driven hydraulic actuators of engineering machinery all use a servo motor to drive the hydraulic pump, and then match the functional valve group to drive the hydraulic cylinder to achieve linear output. The power is generally from a few kilowatts to tens of kilowatts. There is currently a blank for electric-driven hydraulic actuators with higher power exceeding 100 kilowatts.

[0004] Chinese invention patent CN201410601786.2 is a dual-redundancy electromechanical hydrostatic servo mechanism that uses two sets of independent motor pumps and control drive units in parallel to drive the hydraulic cylinder. It is mainly designed to solve the problem that the working reliability of a single set of motor pumps and control drive units cannot meet the system use requirements, and is not designed to solve the actuation requirements of ultra-high power. Summary of the invention

[0005] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art and propose a servo motor pump cluster high-power electric-driven hydraulic actuator to meet the demand for ultra-high-power electric actuators above 100 kilowatts, while having the characteristics of heavy-load capacity, strong impact resistance, compact structure and electrification.

[0006] The solution of the present invention is:

[0007] A servo motor pump cluster type high-power electric drive hydraulic actuator, comprising n servo motor pumps, a first oil replenishment check valve, a second oil replenishment check valve, a first hydraulic control check valve, a second hydraulic control check valve, a first safety valve, a second safety valve, a bypass valve, a first high-pressure pressure sensor, a second high-pressure pressure sensor, a low-pressure pressure sensor, a filling valve, a pressurized oil tank, and a hydraulic cylinder;

[0008] Among them, the oil ports A of the n servo motor pumps are connected to the oil inlet of the first hydraulically controlled one-way valve after converging; the oil outlet of the first hydraulically controlled one-way valve is connected to the A chamber of the hydraulic cylinder;

[0009] The A chamber of the hydraulic cylinder is equipped with a first high-pressure pressure sensor; the control oil port of the first hydraulically controlled one-way valve is connected to the oil port B of n servo motor pumps after merging; the oil port B of n servo motor pumps is connected to the oil inlet of the second hydraulically controlled one-way valve after merging; the oil outlet of the second hydraulically controlled one-way valve is connected to the B chamber of the hydraulic cylinder; the B chamber of the hydraulic cylinder is equipped with a second high-pressure pressure sensor; the control oil port of the second hydraulically controlled one-way valve is connected to the oil port A of n servo motor pumps after merging; the oil outlet of the first oil replenishment one-way valve is connected to the oil port A of n servo motor pumps after merging, and the oil inlet of the first oil replenishment one-way valve is connected to the oil port A of n servo motor pumps. and the boost tank; the oil outlet of the second oil replenishment check valve is connected to the oil port B of n servo motor pumps after confluence, and the oil inlet of the second oil replenishment check valve is connected to the boost tank; the inlet of the first safety valve is connected to the hydraulic cylinder A chamber, and the outlet of the first safety valve is connected to the boost tank; the inlet of the second safety valve is connected to the hydraulic cylinder B chamber, and the outlet of the second safety valve is connected to the boost tank; the three oil ports of the bypass valve are respectively connected to the hydraulic cylinder A chamber, the hydraulic cylinder B chamber, and the boost tank; the low-pressure pressure sensor and the filling valve are both connected to the boost tank; n is a positive integer not less than 10.

[0010] In the above-mentioned servo motor pump cluster type high-power electrically driven hydraulic actuator, a first hydraulically controlled one-way valve is set in the oil circuit between the oil port A of n servo motor pumps and the A chamber of the hydraulic cylinder after the oil port B of n servo motor pumps converge and a second hydraulically controlled one-way valve is set in the oil circuit between the oil port B of n servo motor pumps and the B chamber of the hydraulic cylinder after the oil port B converges; the position of the hydraulic actuator is maintained when it is shut down or powered off.

[0011] In the above-mentioned servo motor pump cluster type high-power electrically driven hydraulic actuator, cluster oil replenishment of n servo motor pumps is achieved by respectively bypassing the first oil replenishment check valve and the second oil replenishment check valve at the oil port A merging oil circuit and the oil port B merging oil circuit of n servo motor pumps.

[0012] In the above-mentioned servo motor pump cluster type high-power electrically driven hydraulic actuator, the maximum working pressure of the hydraulic actuator is limited by providing a first safety valve at the hydraulic cylinder A chamber and a second safety valve at the hydraulic cylinder B chamber.

[0013] In the above-mentioned servo motor pump cluster type high-power electrically driven hydraulic actuator, the pressure of the hydraulic cylinder A chamber is monitored in real time by the first high-pressure pressure sensor; the pressure of the hydraulic cylinder B chamber is monitored in real time by the second high-pressure pressure sensor.

[0014] In the above-mentioned servo motor pump cluster type high-power electrically driven hydraulic actuator, the hydraulic actuator is vacuumed and filled with oil through a manual bypass valve; the n servo motor pump clusters are replenished with oil through a booster tank, and the leaked oil of the n servo motor pumps is collected.

[0015] In the above-mentioned servo motor pump cluster type high-power electrically driven hydraulic actuator, the pressure of the booster tank is monitored by a low-pressure pressure sensor; and the hydraulic actuator is vacuumed and filled with oil through a filling valve.

[0016] In the above-mentioned servo motor pump cluster type high-power electrically driven hydraulic actuator, the actuation process of the hydraulic actuator includes a retracting action and an extending action.

[0017] In the above-mentioned servo motor pump cluster type high-power electric drive hydraulic actuator, the specific process of the retraction action is:

[0018] n servo motor pumps receive the same control instruction from the upper computer and rotate forward to output flow at the same time; after converging, they enter the hydraulic cylinder A chamber through the first hydraulically controlled one-way valve, and at the same time input control oil to the second hydraulically controlled one-way valve, and the second hydraulically controlled one-way valve opens in the opposite direction; the oil in the hydraulic cylinder B chamber flows back to the n servo motor pump B port converging oil circuit through the second hydraulically controlled one-way valve, which is used for the servo motor pump to absorb oil and realize the retraction action of the hydraulic actuator; during the process, the second oil replenishment one-way valve is opened, which is used to replenish oil from the booster tank during the operation of the servo motor pump; the first oil replenishment one-way valve, the first high-pressure safety valve, the second high-pressure safety valve, and the manual bypass valve are closed.

[0019] In the above-mentioned servo motor pump cluster type high-power electric drive hydraulic actuator, the specific process of the extension action is:

[0020] n servo motor pumps receive the same control instruction from the upper computer and rotate in the opposite direction to output flow at the same time; after converging, they enter the hydraulic cylinder B chamber through the second hydraulically controlled one-way valve, and at the same time input control oil to the first hydraulically controlled one-way valve, and the first hydraulically controlled one-way valve opens in the opposite direction; the oil in the hydraulic cylinder A chamber flows back to the n servo motor pump A port converging oil circuit through the first hydraulically controlled one-way valve, and is used for the servo motor pump to absorb oil and realize the extension action of the hydraulic actuator; during the process, the first oil replenishment one-way valve is opened, and is used to replenish oil from the booster tank during the operation of the servo motor pump; the second oil replenishment one-way valve, the first high-pressure safety valve, the second high-pressure safety valve, and the manual bypass valve are closed.

[0021] The beneficial effects of the present invention compared with the prior art are:

[0022] (1) The present invention achieves a leap in the power magnitude of the electrically driven hydraulic actuator through flow synthesis and power superposition, solves the problem of electrification of ultra-high power hydraulic actuators, and provides a new solution for ultra-high power actuators;

[0023] (2) Compared with the traditional valve-controlled actuator, the present invention avoids the problems of ultra-large flow servo valve and ultra-large power hydraulic pump station;

[0024] (3) If any one of the motor pump clusters of the present invention fails, the normal function of the hydraulic actuator will not be affected, thereby achieving ultra-high power output of the actuator and improving reliability;

[0025] (4) The present invention can conveniently form electric-driven hydraulic actuators of different power levels by increasing or decreasing the number of arrays of motor pump clusters, and can easily realize the serialization and standardization of the structure of the electric-driven hydraulic actuators. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the hydraulic actuator system of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the embodiments.

[0028] The present invention provides a servo motor pump cluster high-power electric-driven hydraulic actuator that meets the demand for ultra-high-power electric actuators above 100 kilowatts, and at the same time has the characteristics of heavy-load capacity, strong impact resistance, compact structure and electrification.

[0029] Servo motor pump cluster high power electric drive hydraulic actuator, such as Figure 1As shown, it specifically includes n servo motor pumps 1, a first oil replenishment check valve 21, a second oil replenishment check valve 22, a first hydraulically controlled check valve 31, a second hydraulically controlled check valve 32, a first safety valve 41, a second safety valve 42, a bypass valve 5, a first high-pressure pressure sensor 61, a second high-pressure pressure sensor 62, a low-pressure pressure sensor 7, a filling valve 8, a booster tank 9, and a hydraulic cylinder 10. Among them, the oil ports A of n servo motor pumps 1 are connected to the oil inlet of the first hydraulically controlled one-way valve 31 after converging; the oil outlet of the first hydraulically controlled one-way valve 31 is connected to the A chamber of the hydraulic cylinder 10; the A chamber of the hydraulic cylinder 10 is equipped with a first high-pressure pressure sensor 61; the control oil port of the first hydraulically controlled one-way valve 31 is connected to the oil ports B of n servo motor pumps 1 after converging; the oil ports B of n servo motor pumps 1 are connected to the oil inlet of the second hydraulically controlled one-way valve 32 after converging; the oil outlet of the second hydraulically controlled one-way valve 32 is connected to the B chamber of the hydraulic cylinder 10; the second high-pressure pressure sensor 62 is installed in the B chamber of the hydraulic cylinder 10; the control oil port of the second hydraulically controlled one-way valve 32 is connected to the oil ports A of n servo motor pumps 1 after converging; the oil outlet of the first oil replenishment one-way valve 21 is connected to the n servo motor pumps 1; The oil port A of the motor pump 1 is connected after confluence, and the oil inlet of the first oil replenishment check valve 21 is connected to the boost oil tank 9; the oil outlet of the second oil replenishment check valve 22 is connected to the oil port B of n servo motor pumps 1 after confluence, and the oil inlet of the second oil replenishment check valve 22 is connected to the boost oil tank 9; the inlet of the first safety valve 41 is connected to the A cavity of the hydraulic cylinder 10, and the outlet of the first safety valve 41 is connected to the boost oil tank 9; the inlet of the second safety valve 42 is connected to the B cavity of the hydraulic cylinder 10, and the outlet of the second safety valve 42 is connected to the boost oil tank 9; the three oil ports of the bypass valve 5 are respectively connected to the A cavity of the hydraulic cylinder 10, the B cavity of the hydraulic cylinder 10, and the boost oil tank 9; the low-pressure pressure sensor 7 and the filling valve 8 are both connected to the boost oil tank 9; n is a positive integer not less than 10.

[0030] The present invention sets a first hydraulically controlled one-way valve 31 in the oil circuit between the oil ports A of n servo motor pumps 1 and the A chamber of the hydraulic cylinder 10, and sets a second hydraulically controlled one-way valve 32 in the oil circuit between the oil ports B of n servo motor pumps 1 and the B chamber of the hydraulic cylinder 10, so as to achieve position maintenance when the hydraulic actuator is shut down or powered off.

[0031] By respectively bypassing the first oil replenishment check valve 21 and the second oil replenishment check valve 22 at the oil port A converging oil path and the oil port B converging oil path of the n servo motor pumps 1, the cluster oil replenishment of the n servo motor pumps 1 is realized. By arranging the first safety valve 41 at the hydraulic cylinder 10A cavity and the second safety valve 42 at the hydraulic cylinder 10B cavity, the maximum working pressure of the hydraulic actuator is limited.

[0032] The pressure of the hydraulic cylinder 10A chamber is monitored in real time through the first high-pressure pressure sensor 61; the pressure of the hydraulic cylinder 10B chamber is monitored in real time through the second high-pressure pressure sensor 62. The hydraulic actuator is vacuumed and filled with oil through the manual bypass valve 5; the n servo motor pumps 1 cluster are replenished with oil through the booster oil tank 9, and the leaked oil of the n servo motor pumps 1 is collected.

[0033] The pressure of the boost tank 9 is monitored by the low-pressure pressure sensor 7; and the hydraulic actuator is evacuated and filled with oil through the filling valve 8.

[0034] The actuation process of the hydraulic actuator includes retracting action and extending action.

[0035] The specific process of the retraction action is as follows:

[0036] The n servo motor pumps 1 receive the same control instruction from the upper computer and rotate forward to output flow at the same time; after converging, they enter the hydraulic cylinder 10A cavity through the first hydraulically controlled one-way valve 31, and at the same time input control oil to the second hydraulically controlled one-way valve 32, and the second hydraulically controlled one-way valve 32 opens in the reverse direction; the oil in the hydraulic cylinder 10B cavity flows back to the converging oil circuit of the n servo motor pumps 1B port through the second hydraulically controlled one-way valve 32, which is used for the servo motor pump to absorb oil and realize the retraction action of the hydraulic actuator; during the process, the second oil replenishment one-way valve 22 is opened, which is used to replenish oil from the booster tank during the operation of the servo motor pump; the first oil replenishment one-way valve 21, the first high-pressure safety valve 41, the second high-pressure safety valve 42, and the manual bypass valve 5 are closed.

[0037] The specific process of the stretching action is:

[0038] The n servo motor pumps 1 receive the same control instruction from the upper computer and rotate in the opposite direction to output flow at the same time; after converging, they enter the hydraulic cylinder 10B cavity through the second hydraulically controlled one-way valve 32, and at the same time input control oil to the first hydraulically controlled one-way valve 31, and the first hydraulically controlled one-way valve 31 opens in the opposite direction; the oil in the hydraulic cylinder 10A cavity flows back to the converging oil circuit of the n servo motor pumps 1A ports through the first hydraulically controlled one-way valve 31, which is used for the servo motor pump to absorb oil and realize the extension action of the hydraulic actuator; during the process, the first oil replenishment one-way valve 21 is opened, which is used to replenish oil from the booster tank during the operation of the servo motor pump; the second oil replenishment one-way valve 22, the first high-pressure safety valve 41, the second high-pressure safety valve 42, and the manual bypass valve 5 are closed.

[0039] The present invention adopts the solution of servo motor pump cluster, and increases the number of motor pumps in the previous redundant electrostatic pressure actuator from 2 to 4 to 10 or more, forming a motor pump cluster. One motor pump is 50kW, and 10 motor pumps are 500kW. Through flow integration and power superposition, the power order of magnitude is increased, solving the problem of electrification of ultra-high power hydraulic actuators. Compared with traditional valve-controlled hydraulic actuators, it avoids the problems of ultra-large flow servo valves and ultra-high power hydraulic pump stations. It provides a new solution for ultra-high power actuators.

[0040] The design scheme of an electric-driven hydraulic actuator that integrates a motor pump cluster, a functional valve group, an oil tank, a hydraulic cylinder, etc. is adopted. In this scheme, the motor pump cluster is divided into two groups and arranged in a linear array on the functional valve group. The hydraulic valve, booster oil tank, etc. are arranged inside the functional valve group. The functional valve group is arranged in parallel with the hydraulic cylinder and fixed to the hydraulic cylinder through flanges at both ends to form an integrated electric-driven hydraulic actuator. It has the characteristics of simple structure and easy installation, use and maintenance. Other layouts can also be designed according to actual needs.

[0041] The servo motor pump cluster type high-power electric drive hydraulic actuator adopts modular integrated design. The array motor pump cluster and other hydraulic components of the system are integrated on the functional valve block; the hydraulic cylinder has a rod chamber oil port that is led to the oil port flange in the middle of the cylinder barrel through a section of pipeline. The pipeline and the hydraulic cylinder are an integrated structure, and the two-chamber oil port flanges of the hydraulic cylinder are kept in the same plane. The functional valve group is fixed to the hydraulic cylinder as a whole by bolts, and the inlet and outlet oil confluence ports of the motor pump cluster are correspondingly connected to the two-chamber oil ports of the hydraulic cylinder, realizing the oil circuit communication of the hydraulic actuator, reducing leakage points and improving reliability.

[0042] The servo motor pump cluster type high-power electric drive hydraulic actuator only needs to connect the motor power supply, resolver, sensor and other cables to the outside, without external hydraulic pipelines. The device has a compact structure, a high degree of modularization, and is easy to assemble, making it suitable for work places with narrow installation space.

[0043] The present invention achieves a leap in the power magnitude of the electrically driven hydraulic actuator through flow synthesis and power superposition, solves the problem of electrification of ultra-high power hydraulic actuators, and provides a new solution for ultra-high power actuators. Compared with traditional valve-controlled actuators, it avoids the problems of ultra-large flow servo valves and ultra-high power hydraulic pump stations.

[0044] If any one of the motor pump clusters of the present invention fails, the normal function of the hydraulic actuator will not be affected, thereby achieving ultra-large power output of the actuator and improving reliability.

[0045] The present invention can conveniently form electrically driven hydraulic actuators of different power levels by increasing or decreasing the number of arrays of motor pump clusters, and can easily realize serialization and standardization of the structure of the electrically driven hydraulic actuators.

[0046] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A servo motor pump cluster type high-power electric drive hydraulic actuator, characterized in that: It comprises n servo motor pumps (1), a first oil replenishment check valve (21), a second oil replenishment check valve (22), a first hydraulically controlled check valve (31), a second hydraulically controlled check valve (32), a first safety valve (41), a second safety valve (42), a bypass valve (5), a first high-pressure pressure sensor (61), a second high-pressure pressure sensor (62), a low-pressure pressure sensor (7), a filling valve (8), a booster oil tank (9), and a hydraulic cylinder (10); The oil ports A of the n servo motor pumps (1) are connected to the oil inlet of the first hydraulically controlled one-way valve (31) after converging; the oil outlet of the first hydraulically controlled one-way valve (31) is connected to the A chamber of the hydraulic cylinder (10); The A chamber of the hydraulic cylinder (10) is equipped with a first high-pressure pressure sensor (61); the control oil port of the first hydraulically controlled one-way valve (31) is connected to the oil ports B of n servo motor pumps (1) after merging; the oil ports B of the n servo motor pumps (1) are connected to the oil inlet of the second hydraulically controlled one-way valve (32) after merging; the oil outlet of the second hydraulically controlled one-way valve (32) is connected to the B chamber of the hydraulic cylinder (10); the B chamber of the hydraulic cylinder (10) is equipped with a second high-pressure pressure sensor (62); the control oil port of the second hydraulically controlled one-way valve (32) is connected to the oil ports A of n servo motor pumps (1) after merging; the oil outlet of the first oil replenishment one-way valve (21) is connected to the oil ports A of n servo motor pumps (1) after merging; the oil inlet of the first oil replenishment one-way valve (21) is connected to the booster oil tank (9 ) is connected; the oil outlet of the second oil replenishment check valve (22) is connected to the oil port B of n servo motor pumps (1) after confluence, and the oil inlet of the second oil replenishment check valve (22) is connected to the boosting oil tank (9); the inlet of the first safety valve (41) is connected to the A chamber of the hydraulic cylinder (10), and the outlet of the first safety valve (41) is connected to the boosting oil tank (9); the inlet of the second safety valve (42) is connected to the B chamber of the hydraulic cylinder (10), and the outlet of the second safety valve (42) is connected to the boosting oil tank (9); the three oil ports of the bypass valve (5) are respectively connected to the A chamber of the hydraulic cylinder (10), the B chamber of the hydraulic cylinder (10), and the boosting oil tank (9); the low-pressure pressure sensor (7) and the filling valve (8) are both connected to the boosting oil tank (9); n is a positive integer not less than 10.

2. A servo motor pump cluster type high-power electric drive hydraulic actuator according to claim 1, characterized in that: By providing a first hydraulically controlled one-way valve (31) in the oil circuit between the oil ports A of n servo motor pumps (1) and the A chamber of the hydraulic cylinder (10), and providing a second hydraulically controlled one-way valve (32) in the oil circuit between the oil ports B of n servo motor pumps (1) and the B chamber of the hydraulic cylinder (10), the position of the hydraulic actuator can be maintained when it is shut down or powered off.

3. The servo motor pump cluster type high-power electric drive hydraulic actuator according to claim 1, characterized in that: Cluster oil replenishment of the n servo motor pumps (1) is achieved by respectively bypassing a first oil replenishment check valve (21) and a second oil replenishment check valve (22) in the oil port A converging oil path and the oil port B converging oil path of the n servo motor pumps (1).

4. The servo motor pump cluster type high-power electric drive hydraulic actuator according to claim 1, characterized in that: By arranging a first safety valve (41) at the A chamber of the hydraulic cylinder (10) and a second safety valve (42) at the B chamber of the hydraulic cylinder (10), the maximum working pressure of the hydraulic actuator is limited.

5. The servo motor pump cluster type high-power electric drive hydraulic actuator according to claim 1, characterized in that: The pressure of chamber A of the hydraulic cylinder (10) is monitored in real time by a first high-pressure pressure sensor (61); and the pressure of chamber B of the hydraulic cylinder (10) is monitored in real time by a second high-pressure pressure sensor (62).

6. The servo motor pump cluster type high-power electric drive hydraulic actuator according to claim 1, characterized in that: The manual bypass valve (5) is used to evacuate the hydraulic actuator and add oil. The booster oil tank (9) is used to replenish the oil of the n servo motor pumps (1) and to remove the leaked oil of the n servo motor pumps (1).

7. The servo motor pump cluster type high-power electric drive hydraulic actuator according to claim 1, characterized in that: The pressure of the boost oil tank (9) is monitored by a low-pressure pressure sensor (7); and vacuuming and oil filling of the hydraulic actuator are achieved by a filling valve (8).

8. The servo motor pump cluster type high-power electric drive hydraulic actuator according to claim 1, characterized in that: The actuation process of the hydraulic actuator includes retracting action and extending action.

9. The servo motor pump cluster type high-power electric drive hydraulic actuator according to claim 8, characterized in that: The specific process of the retraction action is: The n servo motor pumps (1) receive the same control instruction from the upper computer and simultaneously rotate forward to output flow; after converging, the oil enters the A chamber of the hydraulic cylinder (10) through the first hydraulically controlled one-way valve (31), and simultaneously inputs control oil to the second hydraulically controlled one-way valve (32), and the second hydraulically controlled one-way valve (32) opens in the reverse direction; the oil in the B chamber of the hydraulic cylinder (10) flows back to the B-port converging oil circuit of the n servo motor pumps (1) through the second hydraulically controlled one-way valve (32), and is used for the servo motor pump to absorb oil, thereby realizing the retraction action of the hydraulic actuator; during the process, the second oil replenishment one-way valve (22) is opened, and is used for replenishing oil from the booster tank during the operation of the servo motor pump; the first oil replenishment one-way valve (21), the first high-pressure safety valve (41), the second high-pressure safety valve (42), and the manual bypass valve (5) are closed.

10. The servo motor pump cluster type high-power electric drive hydraulic actuator according to claim 8, characterized in that: The specific process of the stretching action is: The n servo motor pumps (1) receive the same control instruction from the upper computer and rotate in the opposite direction to output flow at the same time; after converging, the flow enters the B chamber of the hydraulic cylinder (10) through the second hydraulically controlled one-way valve (32), and at the same time inputs control oil to the first hydraulically controlled one-way valve (31), and the first hydraulically controlled one-way valve (31) opens in the opposite direction; the oil in the A chamber of the hydraulic cylinder (10) flows back to the A-port converging oil circuit of the n servo motor pumps (1) through the first hydraulically controlled one-way valve (31), and is used for the servo motor pump to absorb oil, thereby realizing the extension action of the hydraulic actuator; during the process, the first oil replenishment one-way valve (21) is opened, and is used for replenishing oil from the booster tank during the operation of the servo motor pump; the second oil replenishment one-way valve (22), the first high-pressure safety valve (41), the second high-pressure safety valve (42), and the manual bypass valve (5) are closed.

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