Maintenance and detection test bed for electro-hydraulic actuator

Abstract

The utility model relates to an electro-hydraulic actuator maintenance and detection test bench, which belongs to the technical field of electro-hydraulic actuator detection equipment and comprises an operation table and an oil tank, an electro-hydraulic actuator is arranged on the operation table, an electric signal receiver is arranged on the electro-hydraulic actuator, a clamping tool is arranged between the electro-hydraulic actuator and the operation table, and a clamping groove is formed in the oil tank. An oil return pipe and an oil outlet pipe are arranged between the electro-hydraulic actuator and the oil tank, and an oil outlet pump is arranged on the oil outlet pipe. A control signal sent by the controller is received through the electric signal receiver, so that the electro-hydraulic actuator changes the size of a controlled medium, and a controlled variable is maintained on a required numerical value or within a certain range. The device has the characteristics of compact structure and good operation stability. Various test functions can be realized, and safe, reliable and stable operation of the turboset is guaranteed. The device can also be used for testing and maintaining other hydraulic parts, such as a hydraulic servo-motor, an emergency security device, a quick-closing assembly and the like in a steam turbine regulation security system.

Description

Technical Field

[0001] This utility model relates to the technical field of electro-hydraulic actuator testing equipment, specifically to an electro-hydraulic actuator repair and testing test bench. Background Technology

[0002] With the continuous improvement of automation levels, the complexity of systems is rapidly increasing. Users urgently need to improve the reliability and maintainability of systems. The emergence and development of fault detection technology has opened up a new way to improve the reliability and maintainability of equipment systems. Fault diagnosis technology is constantly improving and its application areas are constantly expanding.

[0003] Actuators are an essential component of automatic control systems. Based on their energy source, actuators can be classified into three main categories: pneumatic, hydraulic, and electric. Pneumatic actuators use compressed air as their energy source. They are characterized by simple structure, reliable and stable operation, large output thrust, convenient maintenance, fire and explosion protection, and low cost. Therefore, they are widely used in production processes such as chemical, papermaking, and oil refining, and can be easily integrated with passive instruments.

[0004] Electro-hydraulic actuators are the actuators of turbine regulating valves. They receive commands from the control system and manipulate the opening and closing of turbine valves to control the turbine unit's speed and load. Electro-hydraulic actuators are critical and important refining equipment and systems; their operational reliability and post-failure repair efficiency have a significant impact on the overall equipment operation and safety risk control. In practical applications, the lack of corresponding fault detection and repair methods for electro-hydraulic actuators fails to meet actual production needs. Summary of the Invention

[0005] This invention primarily addresses the shortcomings of existing technologies by providing a maintenance and testing bench for electro-hydraulic actuators, characterized by its compact structure and high operational stability. It can perform multiple testing functions, ensuring the safe, reliable, and stable operation of steam turbine units. It can also be used for testing and maintaining other hydraulic components, such as hydraulic actuators, emergency safety devices, and quick-closing assemblies in steam turbine regulation and safety systems.

[0006] The above-mentioned technical problems of this utility model are mainly solved by the following technical solutions:

[0007] An electro-hydraulic actuator maintenance and testing bench includes an operating platform and an oil tank. An electro-hydraulic actuator is mounted on the operating platform, and an electrical signal receiver is installed on the actuator. A clamping fixture is provided between the electro-hydraulic actuator and the operating platform. A return oil pipe and an outlet oil pipe are provided between the electro-hydraulic actuator and the oil tank, and an oil pump is installed on the outlet oil pipe. The electro-hydraulic actuator receives control signals from a controller via the electrical signal receiver, causing it to change the magnitude of the controlled medium, thereby maintaining the controlled variable at a required value or within a certain range.

[0008] Preferably, each of the oil tanks is equipped with an oil tank filter that is connected to the return oil pipe and the outlet oil pipe respectively. A circulation pump is installed on the return oil pipe. A shut-off valve IV is installed between the outlet oil pump and the oil tank filter, and between the circulation pump and the oil tank filter.

[0009] Preferably, a shut-off valve I is provided between the oil pump and the electro-hydraulic actuator, a shut-off valve II is provided between the circulation pump and the electro-hydraulic actuator, and a check valve is provided between the shut-off valve I and the oil pump, and between the shut-off valve II and the circulation pump.

[0010] Preferably, an oil outlet filter is provided between the oil outlet pump and the check valve, and an accumulator is provided between the shut-off valve I and the check valve. Pressure gauges are provided on the accumulator, between the check valve and the oil outlet filter, and between the oil outlet pump and the oil outlet filter.

[0011] The accumulator has two functions: 1. To store hydraulic energy and provide instantaneous power for the electro-hydraulic actuator; 2. To reduce oil pressure fluctuations in the oil circuit. The accumulator is equipped with a pressure gauge, and the corresponding accumulator pressure is adjusted according to different main oil circuit pressures.

[0012] Preferably, an overflow valve connected to the oil outlet pipe is provided between the one-way valve and the accumulator.

[0013] Preferably, a return oil filter connected to the return oil pipe and the oil tank is provided between the shut-off valve II and the check valve, and a shut-off valve III is provided between the return oil filter and the return oil pipe.

[0014] Preferably, both the oil pump and the circulation pump are equipped with motors. An oil suction replenishment pipe, connected to the return oil pipe, is provided between the circulation pump and the shut-off valve IV, and a shut-off valve VI is provided on the oil suction replenishment pipe.

[0015] Preferably, the control panel is provided with an oil collection pipe connected to the control panel on its side, and the oil collection pipe is equipped with a shut-off valve V. Waste oil flowing out during the disassembly of the electro-hydraulic actuator on the control panel is collected through the oil collection pipe.

[0016] Preferably, the oil tank is equipped with an air filter connected to the oil tank, the upper side of the oil tank is equipped with a liquid level indicator, and the lower side of the oil tank is equipped with an oil drain valve.

[0017] This invention can achieve the following effects:

[0018] This invention provides a test bench for the maintenance and testing of electro-hydraulic actuators. Compared with existing technologies, it features a compact structure and good operational stability. It can perform multiple testing functions, ensuring the safe, reliable, and stable operation of steam turbine units. It can also be used for the testing and maintenance of other hydraulic components, such as hydraulic actuators, emergency safety devices, and quick-closing assemblies in the steam turbine regulation and safety system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] In the diagram: 1. Return oil pipe; 2. Outlet oil pipe; 3. Accumulator; 4. Shut-off valve I; 5. Pressure gauge; 6. Overflow valve; 7. Shut-off valve II; 8. Shut-off valve III; 9. Check valve; 10. Circulating pump; 11. Motor; 12. Suction oil replenishment pipe; 13. Shut-off valve VI; 14. Shut-off valve IV; 15. Oil tank filter; 16. Return oil filter; 17. Oil tank; 18. Air filter; 19. Outlet oil pump; 20. Drain valve; 21. Liquid level indicator; 22. Outlet oil filter; 23. Operating panel; 24. Oil collection pipe; 25. Shut-off valve V; 26. Clamping fixture; 27. Electro-hydraulic actuator; 28. Electrical signal receiver. Detailed Implementation

[0021] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0022] Example: Figure 1As shown, a maintenance and testing bench for an electro-hydraulic actuator includes an operating platform 23 and an oil tank 17. An air filter 18 connected to the oil tank 17 is installed on the oil tank 17. A level indicator 21 is installed on the upper side of the oil tank 17, and a drain valve 20 is installed on the lower side of the oil tank 17. An electro-hydraulic actuator 27 is installed on the operating platform 23, and an electrical signal receiver 28 is installed on the electro-hydraulic actuator 27. A clamping fixture 26 is installed between the electro-hydraulic actuator 27 and the operating platform 23. An oil collection pipe 24 connected to the operating platform 23 is installed on the side of the operating platform 23, and a shut-off valve V 25 is installed on the oil collection pipe 24. A return oil pipe 1 and an outlet oil pipe 2 are provided between the electro-hydraulic actuator 27 and the oil tank 17, and an oil pump 19 is installed on the outlet oil pipe 2. Each oil tank 17 is equipped with an oil tank filter 15, which is connected to the return oil pipe 1 and the outlet oil pipe 2 respectively. A circulation pump 10 is installed on the return oil pipe 1. A shut-off valve IV 14 is installed between the outlet pump 19 and the oil tank filter 15, and between the circulation pump 10 and the oil tank filter 15. Both the outlet pump 19 and the circulation pump 10 are equipped with motors 11. An oil suction replenishment pipe 12, which is connected to the return oil pipe 1, is installed between the circulation pump 10 and the shut-off valve IV 14. A shut-off valve VI 13 is installed on the oil suction replenishment pipe 12. A shut-off valve I 4 is installed between the outlet pump 19 and the electro-hydraulic actuator 27, and a shut-off valve II 7 is installed between the circulation pump 10 and the electro-hydraulic actuator 27. A check valve 9 is installed between the shut-off valve I 4 and the outlet pump 19, and between the shut-off valve II 7 and the circulation pump 10. An oil outlet filter 22 is installed between the oil outlet pump 19 and the check valve 9. An accumulator 3 is installed between the shut-off valve I4 and the check valve 9. Pressure gauges 5 are installed on the accumulator 3, between the check valve 9 and the oil outlet filter 22, and between the oil outlet pump 19 and the oil outlet filter 22. An overflow valve 6 connected to the oil outlet pipe 2 is installed between the check valve 9 and the accumulator 3. A return oil filter 16 connected to the return oil pipe 1 and the oil tank 17 is installed between the shut-off valve II7 and the check valve 9. A shut-off valve III8 is installed between the return oil filter 16 and the return oil pipe 1.

[0023] When the electro-hydraulic actuator 27 is being tested, the shut-off valve I4 on the oil outlet pipe 2 and the shut-off valves II7 and III8 on the oil return pipe 1 are opened, and the oil pump 19 is started, so that the working oil enters the electro-hydraulic actuator 27 from the oil tank 17 through the oil outlet pipe 2, and then returns to the oil tank 17 through the oil return pipe 1 in the circulation oil circuit.

[0024] When the level indicator 21 of the oil tank 17 shows insufficient oil, open the shut-off valve III 8 and shut-off valve VI 13, and close the shut-off valve IV 14 and shut-off valve II 7; start the circulation pump 10 so that the working oil is injected into the oil tank 17 through the oil suction replenishment pipe 12 and the return oil filter 16.

[0025] In summary, this electro-hydraulic actuator maintenance and testing bench features a compact structure and good operational stability. It can perform multiple testing functions, ensuring the safe, reliable, and stable operation of steam turbine units. It can also be used for testing and repairing other hydraulic components, such as hydraulic actuators, emergency safety devices, and quick-closing assemblies in the steam turbine regulation and safety system.

[0026] It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0027] In summary, the above description is only a specific embodiment of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. An electro-hydraulic actuator service test bench, characterized in that: The utility model provides an oil tank (17) and operation platform (23) are provided with electro-hydraulic actuator (27), electro-hydraulic actuator (27) is provided with electric signal receiver (28), electro-hydraulic actuator (27) is equipped with clamping tool (26) between operation platform (23), electro-hydraulic actuator (27) is equipped with return pipe (1) and oil outlet pipe (2) between oil tank (17), and oil outlet pipe (2) is equipped with oil pump (19).

2. An electro-hydraulic actuator service test bench according to claim 1, characterized in that: The oil tank (17) is provided with an oil tank oil filter (15) which is communicated with the return pipe (1) and the oil outlet pipe (2) respectively, the return pipe (1) is provided with a circulating pump (10), and the oil pump (19) and the oil tank oil filter (15) and the circulating pump (10) and the oil tank oil filter (15) are provided with a stop valve IV (14) respectively.

3. An electro-hydraulic actuator service test bench according to claim 2, characterized in that: The oil pump (19) and the electro-hydraulic actuator (27) are provided with a stop valve I (4), the circulating pump (10) and the electro-hydraulic actuator (27) are provided with a stop valve II (7), and the stop valve I (4) and the oil pump (19) and the stop valve II (7) and the circulating pump (10) are provided with a check valve (9) respectively.

4. An electro-hydraulic actuator service test bench according to claim 3, characterized in that: The oil pump (19) and the check valve (9) are provided with an oil outlet oil filter (22), the stop valve I (4) and the check valve (9) are provided with an accumulator (3), and the accumulator (3) and the check valve (9) and the oil outlet oil filter (22) and the oil pump (19) and the oil outlet oil filter (22) are provided with a pressure gauge (5).

5. An electro-hydraulic actuator service test bench according to claim 4, characterized in that: The check valve (9) and the accumulator (3) are provided with an overflow valve (6) which is communicated with the oil outlet pipe (2).

6. The electro-hydraulic actuator service test bench of claim 3, wherein: The stop valve II (7) and the check valve (9) are provided with a return oil filter (16) which is communicated with the return pipe (1) and the oil tank (17), and the return oil filter (16) and the return pipe (1) are provided with a stop valve III (8).

7. The electro-hydraulic actuator service test bench of claim 2, wherein: The oil pump (19) and the circulating pump (10) are provided with a motor (11), the circulating pump (10) and the stop valve IV (14) are provided with an oil suction supplement pipe (12) which is communicated with the return pipe (1), and the oil suction supplement pipe (12) is provided with a stop valve VI (13).

8. The electro-hydraulic actuator service test bench of claim 1, wherein: The operation platform (23) is provided with a collecting pipe (24) which is communicated with the operation platform (23), and the collecting pipe (24) is provided with a stop valve V (25).

9. The electro-hydraulic actuator service test bench of claim 1, wherein: The oil tank (17) is provided with an air filter (18) which is communicated with the oil tank (17), the upper side of the oil tank (17) is provided with a liquid level indicator (21), and the lower side of the oil tank (17) is provided with a drain valve (20).

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