Tractor hydraulic system detection device

Abstract

The invention provides a tractor hydraulic system detection device, which aims to solve the problem of cross contamination caused by the existing one-way passage design, and comprises a controller, a coarse and fine adjusting throttle valve, an oil pressure sensor, a multi-passage valve block, an oil pressure temperature sensor, a flow meter, an isolation cylinder, a circulating pump, a hydraulic oil buffer tank and a stop valve, the oil inlet male head and the oil outlet male head are connected with a tractor hydraulic system, the oil pressure sensors are installed on the oil inlet male head and the oil outlet male head respectively, real-time monitoring of pressure changes is ensured, the isolation barrel is divided into the oil inlet isolation barrel and the oil outlet isolation barrel, the piston is arranged in the isolation barrel, the barrel body is divided into the detection section and the connection section, cross contamination of hydraulic oil of different devices is effectively prevented, and the reliability of the device is improved. And a circulating pump is arranged between the detection section and the connection section to ensure that hydraulic oil in the connection section can be completely discharged or replaced after each detection. Through multi-protection and redundancy design, the stability and safety of the system are improved, and the system has high practical value and popularization prospect.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic system detection, and in particular relates to a tractor hydraulic system detection device. Background Art

[0002] The performance of the tractor hydraulic system directly affects its working efficiency and service life. Therefore, the detection and evaluation of the hydraulic system is particularly important in the design, production and maintenance of the tractor. Parameters such as hydraulic output power and maximum oil pressure are not only key indicators for evaluating tractor performance, but also the basis for ensuring that the tractor can effectively cooperate with various agricultural machinery to operate.

[0003] By testing the output power of the hydraulic system, it can be ensured that the tractor can provide sufficient power for the connected agricultural machinery, thereby ensuring operating efficiency; regular testing of the working status of the hydraulic system helps to promptly discover and solve potential problems, avoid equipment damage caused by overload or improper use, and thus extend the service life of the tractor and its supporting agricultural machinery; in the research and development process of new tractor products, detailed testing of the hydraulic system can provide data support for design optimization and ensure that new products can meet the needs of the market and users; abnormalities in the hydraulic system may lead to operating errors or accidents. Through effective detection methods, these problems can be prevented in advance to ensure the safety of operators.

[0004] Functional features of the hydraulic power detection device: It can accurately measure the key parameters of the hydraulic system, such as oil pressure, flow, temperature, etc.; in addition to the basic detection functions, it can also integrate fault diagnosis, data recording and other functions for easy analysis and management; it is lightweight, easy to carry and install, and suitable for rapid on-site detection; combined with modern information technology, such as the Internet of Things and big data analysis, it can realize remote transmission, real-time monitoring and intelligent analysis of detection data.

[0005] Before leaving the factory, the hydraulic system of each tractor is fully tested to ensure product quality; professional maintenance services are provided to users to help them understand the health of the tractor in a timely manner and make reasonable maintenance suggestions; when developing new agricultural machinery, the device can be used to test the compatibility and matching between different models of tractors and agricultural machinery. In short, with the development of agricultural science and technology and the advancement of technology, the application of hydraulic power detection devices will become more and more extensive, which is of great significance to improving the level of agricultural mechanization and promoting agricultural modernization.

[0006] At present, hydraulic testing devices are all one-way passages, connected to the hydraulic system to be tested through corresponding joints to realize a circulation passage, and the hydraulic pressure of the hydraulic system to be tested is completely circulated in the testing device. Since the testing device is a universal device, it is necessary to test the hydraulic systems of different vehicles. Impurities will be mixed into the hydraulic oil of the hydraulic systems of different equipment to varying degrees, and the hydraulic oil will remain in the testing device. The inside of the testing device cannot be cleaned frequently, which leads to the cross-flow of impurities in the hydraulic oil when testing the hydraulic systems of multiple equipment, causing cross-contamination between the hydraulic oils of different equipment. Summary of the invention

[0007] Aiming at the problem of cross contamination between hydraulic oils of different equipment when detecting hydraulic systems of multiple vehicles, the present invention provides a tractor hydraulic system detection device which performs indirect detection through an isolation cylinder.

[0008] The solution adopted by the present invention to solve its technical problems is: a tractor hydraulic system detection device, including a controller, a coarse and fine adjustment throttle valve, an oil pressure sensor, a multi-channel valve block, an oil pressure temperature sensor and a flow meter; also including an isolation cylinder, a circulating pump, a hydraulic oil buffer box and a stop valve, wherein the detection device is connected to the tractor hydraulic system through an oil inlet male head and an oil outlet male head, and the oil pressure sensor is respectively installed on the oil inlet male head and the oil outlet male head; the isolation cylinder is divided into an oil inlet isolation cylinder and an oil outlet isolation cylinder, the oil inlet male head is connected to the oil inlet isolation cylinder through an oil pipe, the oil outlet male head is connected to the oil outlet isolation cylinder through an oil pipe, a multi-channel valve block is installed on the oil pipe connected with the oil inlet male head and the oil outlet male head, and an oil pressure temperature sensor is installed on the multi-channel valve block; the isolation cylinder includes a cylinder body and a piston, a movable piston is set in the cylinder body, the piston divides the cylinder body into a detection section and a connection section, the oil inlet male head and the oil outlet male head are respectively connected to the oil inlet isolation cylinder and the oil outlet isolation cylinder through oil pipes The connecting section, the detection section of the oil inlet isolation cylinder and the oil outlet isolation cylinder are connected through an oil pipe; a hydraulic oil cache box, a coarse and fine adjustment throttle valve and a flow meter are installed in sequence between the detection sections of the oil inlet isolation cylinder and the oil outlet isolation cylinder, the hydraulic oil cache box provides hydraulic oil supply for the detection section, the flow meter is used to detect the hydraulic oil flow of the detection section, thereby indirectly obtaining the flow when the tractor hydraulic system is working, the coarse and fine adjustment throttle valve is used for flow adjustment when the hydraulic oil is working, and a stop valve k02 is installed at the oil outlet end of the hydraulic oil cache box; a stop valve k01 and a circulating pump are installed between the connecting section of the oil inlet isolation cylinder and the oil outlet isolation cylinder, and the connecting section of the oil inlet isolation cylinder and the oil outlet isolation cylinder is connected through the circulating pump, and the stop valve k01 controls the on-off between the connecting sections, and the oil pressure sensor, the oil pressure temperature sensor and the flow meter are data connected with the controller, and the controller controls the multi-channel valve block, the coarse and fine adjustment throttle valve, the hydraulic oil cache box, the stop valve and the circulating pump.

[0009] Furthermore, the controller includes a PLC controller and a measurement and control host.

[0010] Furthermore, the hydraulic oil buffer box includes a cylinder body and an electric push rod. The electric push rod is installed at the upper end of the cylinder body. A piston is installed at the end of the electric push rod and extends into the rod body. A stop valve k02 is installed at the lower end of the rod body, and the oil pipe between the connecting section of the oil inlet isolation cylinder and the oil outlet isolation cylinder is connected through a tee.

[0011] Furthermore, the circulating pump includes a driving motor, a delay coupling and an oil pump. The output shaft of the driving motor is connected to the oil pump through the delay coupling. The oil inlet and oil outlet of the oil pump are respectively connected to the oil inlet isolation cylinder and the oil outlet isolation cylinder through oil pipes. A stop valve k01 is installed between the oil pump and the oil inlet isolation cylinder.

[0012] Furthermore, the extension coupling includes a driving plate, a driven plate and a torsion spring. The driving plate is mounted on the output shaft of the driving motor, and the driven plate is mounted on the driving shaft of the oil pump. A protrusion facing the driven plate is provided on the driving plate, and a protrusion facing the driving plate is provided on the driven plate. After the driving plate rotates, the protrusion on the driving plate contacts the protrusion on the driven plate, thereby driving the oil pump to operate. A torsion spring is installed between the driving plate and the driven plate. When the driving plate and the driven plate stop, the torsion spring maintains a fixed angle between the driving plate and the driven plate.

[0013] Furthermore, the driving plate is fixed on the motor shaft, a central shaft hole is provided at the center of the motor shaft, the driven plate is fixed on the driving shaft of the oil pump, an insert shaft is extended from the driving shaft of the oil pump toward one side of the motor, the insert shaft is inserted into the central shaft hole, and the torsion spring is sleeved on the insert shaft.

[0014] Furthermore, the inner wall of the isolation cylinder is provided with symmetrical guide blocks, and the piston is provided with corresponding guide grooves, and the piston moves up and down in the isolation cylinder along the guide blocks.

[0015] Beneficial effects of the present invention: The present invention provides a tractor hydraulic system detection device which effectively solves the cross-contamination problem caused by one-way channel design and internal cleaning difficulties by introducing components such as an isolation cylinder, a hydraulic oil buffer box, a circulation pump and a multi-channel valve block.

[0016] The oil inlet isolation cylinder and the oil outlet isolation cylinder are divided into the detection section and the connection section by the piston, ensuring that the hydraulic oil in the detection section is isolated from the hydraulic oil in the connection section, preventing direct contact between the hydraulic oils of different equipment and avoiding cross contamination of impurities. Through the circulation pump and the stop valve k01, an independent circulation system can be established between the detection section and the connection section to ensure that the hydraulic oil in the connection section can be completely discharged or replaced after each test, reducing the impact of residual impurities.

[0017] The multi-channel valve block can realize precise control of multiple fluid channels, ensure the controllable flow path of hydraulic oil in the detection device, and improve the accuracy of the detection results. The oil pressure sensors installed on the oil inlet and outlet male heads, as well as the oil pressure temperature sensor on the multi-channel valve block, can monitor the pressure and temperature changes of the hydraulic system in real time and provide more comprehensive detection data. The flow meter is used to detect the flow of hydraulic oil in the detection section, and indirectly obtain the flow of the tractor hydraulic system when it is working, to ensure the accuracy of the flow data. The working flow of hydraulic oil can be adjusted by coarse and fine adjustment of the throttle valve to meet the needs of different equipment and working conditions, and improve the flexibility and applicability of detection.

[0018] The hydraulic oil buffer tank provides a stable supply of hydraulic oil to the detection section, ensuring sufficient hydraulic oil during the detection process. At the same time, the shut-off valve K02 can easily control the inlet and outlet of the hydraulic oil, which is convenient for cleaning and maintenance. The shut-off valve K01 and the circulation pump can easily cut off and restore the passage between the connection sections, simplifying the cleaning and maintenance operations.

[0019] Through the comprehensive monitoring of the multi-channel valve block, oil pressure sensor, oil pressure temperature sensor and flow meter, abnormal conditions in the system can be discovered and handled in time, improving the reliability and safety of the system.

[0020] The present invention effectively solves the cross contamination problem existing in the existing hydraulic detection device through innovative design and reasonable layout, and improves the accuracy and reliability of the detection results. At the same time, the automatic control and flexible flow regulation functions enable the detection device to adapt to a variety of equipment and working conditions, and has high practical value and promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a cross-sectional structural schematic diagram of the present invention; Figure 3 It is a three-dimensional structural diagram of a circulation pump; Figure 4 It is a cross-sectional structural diagram of the time-delay coupling; Figure 5 It is a schematic diagram of the internal structure of the isolation cylinder.

[0022] Numbers in the figure: 1. controller; 2. oil inlet male connector; 3. oil outlet male connector; 4. multi-channel valve block; 5. oil pressure sensor; 6. oil pressure temperature sensor; 7. circulating pump; 8. oil inlet isolation cylinder; 9. oil outlet isolation cylinder; 10. hydraulic oil buffer tank; 11. coarse and fine adjustment throttle valve; 12. flow meter; 13. stop valve k01; 14. tractor hydraulic system; 15. piston; 16. stop valve k02; 17. drive motor; 18. delay coupling; 19. oil pump; 181. drive plate; 182. driven plate; 183. torsion spring; 801. guide block. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below.

[0024] Example 1: Figure 1 and Figure 2 As shown, the tractor hydraulic system 14 detection device provided by the present invention includes a controller 1, a coarse and fine adjustment throttle valve 11, an oil pressure sensor 5, a multi-channel valve block 4, an oil pressure temperature sensor 6 and a flow meter 12. The detection device is provided with an oil inlet male connector 2 and an oil outlet male connector 3 connected to the tractor hydraulic system 14 to be detected, and an oil pressure sensor 5 is installed on the oil inlet male connector 2 and the oil outlet male connector 3 to instantly detect the inlet and outlet oil pressures when the hydraulic system is running.

[0025] A multi-channel valve block 4 is installed on the oil pipe connected to the oil inlet male connector 2 and the oil outlet male connector 3. The multi-channel valve block 4 can simultaneously control the opening and closing of the oil inlet and oil outlet pipelines. The multi-channel valve block 4 is usually composed of one or more valves. In the present invention, in order to simultaneously control the oil inlet and oil outlet, a double valve structure is adopted. At the same time, in order to be able to quickly and accurately perform on-off control, the multi-channel valve block 4 is equipped with an electromagnetic control function. At the same time, an oil pressure temperature sensor 6 is installed on the multi-channel valve block 4 to detect the oil pressure temperature when the hydraulic system is running.

[0026] The detection device also includes an isolation cylinder, a circulation pump 7, a hydraulic oil buffer box 10 and a plurality of stop valves. The circulation pump 7 includes a driving motor 17, a delay coupling 18 and an oil pump 19. The delay coupling 18 includes a driving disc 181, a driven disc 182 and a torsion spring 183. The driving disc 181 is installed on the output shaft of the driving motor 17, and the driven disc 182 is installed on the driving shaft of the oil pump 19. A protrusion facing the driven disc 182 is provided on the driving disc 181, and a protrusion facing the driven disc 182 is provided on the driven disc 182. After the driving disc 181 rotates, the protrusion on the driving disc 181 is in contact with the protrusion on the driven disc 182, thereby driving the oil pump 19 to run; a torsion spring 183 is installed between the driving disc 181 and the driven disc 182. When the driving disc 181 and the driven disc 182 stop, the torsion spring 183 maintains a fixed angle between the driving disc 181 and the driven disc 182.

[0027] Furthermore, the driving disk 181 is fixed on the motor shaft, a central shaft hole is provided at the center of the motor shaft, the driven disk 182 is fixed on the driving shaft of the oil pump 19, and the driving shaft of the oil pump 19 extends to one side of the motor with an inserted shaft, the inserted shaft is inserted in the central shaft hole, the torsion spring 183 is sleeved on the inserted shaft and is located between the driving disk 181 and the driven disk 182.

[0028] The time-delay coupling 18 avoids hard connection between the motor and the oil pump 19, thereby avoiding damage to the oil pump 19. Meanwhile, the time-delayed start of the oil pump 19 can reserve operation time for the opening and closing of valves such as stop valves, making the detection device more reliable and accurate during use.

[0029] The isolation cylinder is divided into an oil inlet isolation cylinder 8 and an oil outlet isolation cylinder 9. The isolation cylinder includes a cylinder body and a piston 15. The piston 15 divides the cylinder body into two parts, namely a detection section and a connecting section. The connecting section is connected to the tractor hydraulic system 14 through an oil pipe, and the detection section is connected to the detection device.

[0030] Symmetrical guide blocks 801 are provided on the inner wall of the isolation cylinder, and corresponding guide grooves are provided on the piston 15 . The piston 15 moves up and down in the isolation cylinder along the guide blocks 801 .

[0031] The connecting section of the oil inlet isolation cylinder 8 is connected to the oil inlet male connector 2 through an oil pipe, and the connecting section of the oil outlet isolation cylinder 9 is connected to the oil outlet male connector 3 through an oil pipe, and is connected to the tractor hydraulic system 14 through the oil inlet male connector 2 and the oil outlet male connector 3.

[0032] Oil pressure sensors 5 are respectively installed on the oil inlet male connector 2 and the oil outlet male connector 3 to detect the oil pressure at the oil inlet end and the oil outlet end.

[0033] A multi-way valve block 4 is installed on the oil pipe at the oil inlet end and the oil pipe at the oil outlet end, and the multi-way valve block 4 is used to control the on-off of the oil circuit. An oil pressure temperature sensor 6 is installed on the multi-way valve block 4 to detect the hydraulic oil temperature when the tractor hydraulic system 14 is running.

[0034] The detection sections of the oil inlet isolation cylinder 8 and the oil outlet isolation cylinder 9 are connected by an oil pipe, and a hydraulic oil buffer tank 10, a flow meter 12 and a coarse and fine adjustment throttle valve 11 are installed in sequence between the detection sections of the oil inlet isolation cylinder 8 and the oil outlet isolation cylinder 9. The hydraulic oil buffer tank 10 provides hydraulic oil supply to the detection section, the flow meter 12 is used to detect the hydraulic oil flow of the detection section, thereby indirectly obtaining the flow of the tractor hydraulic system 14 when it is working, and the coarse and fine adjustment throttle valve 11 is used to control the flow of the hydraulic oil when it is working.

[0035] Specific working process: In the initial state, the stop valve k0113 is closed, the multi-way valve block 4 is opened, the stop valve k0216 is opened, and the hydraulic oil buffer tank 10 is used to transport hydraulic oil to the detection sections of the two isolation cylinders, and the piston 15 moves to the upper part of the isolation cylinder.

[0036] Step 2: Use the oil inlet male connector 2 and the oil outlet male connector 3 to connect the tractor hydraulic system 14.

[0037] The third step is to start the tractor hydraulic system 14 to supply oil to the oil inlet isolation cylinder 8, and at the same time the hydraulic oil buffer tank 10 recovers the hydraulic oil in the detection system until the hydraulic oil in the tractor hydraulic system 14 fills the connecting section of the oil inlet isolation cylinder 8.

[0038] Step 4: open the stop valve k0113, start the circulation pump 7, and simultaneously close the stop valve k0216 to disconnect the hydraulic oil buffer tank 10 from the detection system, and close the multi-channel valve block 4 at the same time.

[0039] Step 5: The hydraulic oil in the oil inlet isolation cylinder 8 is transported to the oil outlet isolation cylinder 9 through the circulation pump 7, and the hydraulic oil in the detection device circulates from the oil outlet isolation cylinder 9 to the oil inlet isolation cylinder 8.

[0040] Step 6. Open the multi-way valve block 4 and start the tractor hydraulic system 14. The tractor hydraulic system 14 supplies oil to the oil inlet isolation cylinder 8 again. The hydraulic oil of the detection device moves to the oil outlet isolation cylinder 9 under the push of the tractor hydraulic system 14. The tractor hydraulic oil in the oil outlet isolation cylinder 9 is synchronously transported back to the tractor.

[0041] Step 7. During this process, since hydraulic oil is not easily compressed, the power of the tractor hydraulic system 14 can be completely transmitted to the detection device. The flow of hydraulic oil in the detection device can truly reflect the power of the tractor hydraulic system 14, and the flow meter 12 in the detection device can accurately reflect the flow of the tractor hydraulic system 14 being detected.

[0042] Step 8. After the test is completed, start the circulation pump 7 again, open the stop valve k0113, and simultaneously close the stop valve k0216 and the multi-channel valve block 4 to transport the tractor hydraulic oil in the oil inlet isolation cylinder 8 to the oil outlet isolation cylinder 9.

[0043] Step 9. Open the hydraulic oil buffer box 10 and connect it to the detection system and the multi-channel valve block 4. The hydraulic oil of the detection device of the hydraulic oil buffer box 10 is transported outward, pushing the tractor hydraulic oil in the oil outlet isolation cylinder 9 to flow back into the tractor hydraulic system 14.

[0044] During this process, no tractor hydraulic oil will remain in the testing device, thus avoiding the problem of cross-contamination of hydraulic oil between different tested equipment.

[0045] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A tractor hydraulic system detection device, comprising a controller (1), a coarse and fine adjustment throttle valve (11), an oil pressure sensor (5), a multi-channel valve block (4), an oil pressure temperature sensor (6) and a flow meter (12), characterized in that: It also includes an isolation cylinder, a circulation pump (7), a hydraulic oil buffer tank (10) and a stop valve, wherein the detection device is connected to the tractor hydraulic system (14) via an oil inlet male connector (2) and an oil outlet male connector (3), and an oil pressure sensor (5) is installed on the oil inlet male connector (2) and the oil outlet male connector (3), respectively; the isolation cylinder is divided into an oil inlet isolation cylinder (8) and an oil outlet isolation cylinder (9), the oil inlet male connector (2) is connected to the oil inlet isolation cylinder (8) via an oil pipe, the oil outlet male connector (3) is connected to the oil outlet isolation cylinder (9) via an oil pipe, and the oil inlet male connector (2) and the oil outlet male connector (3) are connected to the oil inlet isolation cylinder (8) via an oil pipe. ) is installed on the oil pipe connected to the multi-channel valve block (4), and the oil pressure temperature sensor (6) is installed on the multi-channel valve block (4); the isolation cylinder comprises a cylinder body and a piston (15), a movable piston (15) is set in the cylinder body, and the piston (15) divides the cylinder body into a detection section and a connection section, the oil inlet male head (2) and the oil outlet male head (3) are respectively connected to the connection section of the oil inlet isolation cylinder (8) and the oil outlet isolation cylinder (9) through the oil pipe, and the detection sections of the oil inlet isolation cylinder (8) and the oil outlet isolation cylinder (9) are connected through the oil pipe; A hydraulic oil buffer tank (10), a coarse and fine adjustment throttle valve (11) and a flow meter (12) are sequentially installed between the detection sections of the cylinder (9); the hydraulic oil buffer tank (10) provides hydraulic oil supply to the detection section; the flow meter (12) is used to detect the flow of hydraulic oil in the detection section, thereby indirectly obtaining the flow of the tractor hydraulic system (14) when it is working; the coarse and fine adjustment throttle valve (11) is used to adjust the flow of hydraulic oil when it is working; and a stop valve k02 (16) is installed at the oil outlet end of the hydraulic oil buffer tank (10); the oil inlet isolation cylinder (8) and the oil outlet isolation cylinder (9) are provided with a stop valve k02 (16); A stop valve k01 (13) and a circulation pump (7) are installed between the connecting sections of the oil inlet isolation cylinder (8) and the oil outlet isolation cylinder (9). The connecting sections of the oil inlet isolation cylinder (8) and the oil outlet isolation cylinder (9) are connected through the circulation pump (7). The stop valve k01 (13) controls the connection between the connecting sections. The oil pressure sensor (5), the oil pressure temperature sensor (6) and the flow meter (12) are data-connected with the controller (1). At the same time, the controller (1) controls the multi-channel valve block (4), the coarse and fine adjustment throttle valve (11), the hydraulic oil buffer tank (10), the stop valve and the circulation pump (7).

2. The tractor hydraulic system detection device according to claim 1, characterized in that: The controller (1) comprises a PLC controller (1) and a measurement and control host.

3. The tractor hydraulic system detection device according to claim 1, characterized in that: The hydraulic oil buffer box (10) comprises a cylinder body and an electric push rod. The electric push rod is installed at the upper end of the cylinder body. A piston (15) is installed at the end of the electric push rod and extends into the rod body. A stop valve k02 (16) is installed at the lower end of the rod body. The oil pipe between the connecting sections of the oil inlet isolation cylinder (8) and the oil outlet isolation cylinder (9) is connected via a tee.

4. The tractor hydraulic system detection device according to claim 1, characterized in that: The circulation pump (7) comprises a driving motor (17), a time-delay coupling (18) and an oil pump (19); the output shaft of the driving motor (17) is connected to the oil pump (19) via the time-delay coupling (18); the oil inlet end and the oil outlet end of the oil pump (19) are respectively connected to the oil inlet isolation cylinder (8) and the oil outlet isolation cylinder (9) via oil pipes; a stop valve k01 (13) is installed between the oil pump (19) and the oil inlet isolation cylinder (8).

5. The tractor hydraulic system detection device according to claim 4, characterized in that: The extension coupling comprises a driving disc (181), a driven disc (182) and a torsion spring (183); the driving disc (181) is mounted on the output shaft of the driving motor (17); the driven disc (182) is mounted on the driving shaft of the oil pump (19); a protrusion facing the driven disc (182) is arranged on the driving disc (181); a protrusion facing the driven disc (182) is arranged on the driven disc (181); after the driving disc (181) rotates, the protrusion on the driving disc (181) contacts the protrusion on the driven disc (182), thereby driving the oil pump (19) to operate; a torsion spring (183) is installed between the driving disc (181) and the driven disc (182); when the driving disc (181) and the driven disc (182) stop, the torsion spring (183) maintains a fixed angle between the driving disc (181) and the driven disc (182).

6. The tractor hydraulic system detection device according to claim 5, characterized in that: The driving plate (181) is fixed on the motor shaft, a central shaft hole is provided at the center of the motor shaft, the driven plate (182) is fixed on the driving shaft of the oil pump (19), an insertion shaft is extended from the driving shaft of the oil pump (19) toward one side of the motor, the insertion shaft is inserted into the central shaft hole, and a torsion spring (183) is sleeved on the insertion shaft.

7. The tractor hydraulic system detection device according to claim 1, characterized in that: Symmetrical guide blocks (801) are provided on the inner wall of the isolation cylinder, and corresponding guide grooves are provided on the piston (15). The piston (15) moves up and down in the isolation cylinder along the guide blocks (801).

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