Tension and compression device for sensor assembly of hydraulic dynamometer

Abstract

The invention belongs to the technical field of hydraulic dynamometers, and discloses a hydraulic dynamometer sensor assembly pulling and pressing device which comprises a public base, two centering assemblies are arranged above one end of the public base, each centering assembly comprises a disc box, and two fixing frames are installed at the upper end of each disc box. A bearing frame is rotatably arranged on the inner side of the fixing frame, and an adjusting lead screw is rotatably arranged on the inner side of the bearing frame. Through cooperation of structures such as a centering assembly and a hydraulic cylinder, an inserting rod can be conveniently clamped through a clamping structure in an adjusting mode; during clamping, it can be guaranteed that the axis center of the tension and pressure sensor assembly coincides with the axis center of the hydraulic cylinder, the problem that the precision and the service life are affected due to the fact that additional bending moment exists when tension and pressure are applied is solved, and the centering effect can be achieved in a clamping mode; the problems that the precision of the tension and pressure sensor assembly is reduced and the service life of the tension and pressure sensor assembly is shortened due to additional bending moment when the prestress is applied are effectively avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydraulic dynamometers, and particularly relates to a hydraulic dynamometer sensor assembly tension and compression device. BACKGROUND

[0002] The hydraulic dynamometer tension and compression sensor assembly is an important component of a low-speed high-power hydraulic dynamometer. When the hydraulic dynamometer is used to test the performance of a prime mover, the rotor assembly of the hydraulic dynamometer rotates with the prime mover, stirs the water in the hydraulic dynamometer, and transmits the torque to the stator and the shell. The stator and the shell are relatively rotated at a small angle with respect to the base of the hydraulic dynamometer, and the movement trend of the stator and the shell is resisted by the tension and compression sensor assembly. The tension (compression) force is measured by the tension and compression sensor, and the power of the prime mover can be obtained by torque conversion, combined with the length of the force arm and the rotation speed. Therefore, the accuracy of the torque measurement of the hydraulic dynamometer directly affects the calculation of the absorbed power of the hydraulic dynamometer. Most of the hydraulic dynamometers at home and abroad are measured by the tension and compression sensor assembly. Such a device is prone to sensor loosening during equipment operation, which may cause inaccurate measurement or damage to the sensor, and even damage to the hydraulic dynamometer body. The tension and compression sensor device can greatly reduce the assembly difficulty and reduce the manufacturing cost of the product.

[0003] In the prior art, the tension and compression sensor assembly is pre-stretched before final assembly by the tension and compression device, and the upper and lower locking nuts of the tension and compression sensor are locked under the condition of simulating the maximum tension and compression force of the hydraulic dynamometer. The operation is convenient and fast, the structure of the tension and compression device is simple, the output is stable, the device is easy to disassemble and assemble, and the influence of vibration on the tension and compression sensor assembly during the operation of the hydraulic dynamometer can be effectively reduced. However, when the tension and compression sensor assembly and the device are assembled, in order to facilitate installation and leave a gap, the shaft center of the tension and compression sensor assembly and the hydraulic cylinder is not centered during the pulling process, which may generate additional bending moment when tension and compression force is applied, affecting the pre-stretching accuracy and the service life of the sensor. SUMMARY

[0004] To solve the problems in the background art, the application provides a hydraulic dynamometer sensor assembly tension and compression device, which can solve the problem that the shaft center of the tension and compression sensor assembly and the hydraulic cylinder is not centered during the pulling process, which may generate additional bending moment when tension and compression force is applied, affecting the pre-stretching accuracy and the service life of the tension and compression sensor assembly.

[0005] To achieve the above-mentioned purpose, the application provides the following technical scheme: a hydraulic dynamometer sensor assembly tension and compression device, comprising a common base, two sets of centering assemblies are arranged above one end of the common base. The centering assembly includes a disc box, and two sets of fixing frames are installed on the upper end of the disc box. A bearing frame is rotatably mounted on the inner side of the fixing frame, and an adjusting screw is rotatably mounted on the inner side of the bearing frame. An adjusting ring is rotatably mounted on the inner side of the disc box, and a rotating sleeve is rotatably mounted on the inner side of the upper end of the adjusting ring. The adjusting screw is rotatably mounted on the inner side of the rotating sleeve. Six sets of drive plates are rotatably mounted on the inner side of the two sets of drive plates away from the adjusting ring. A clamping plate is rotatably mounted on the inner side of the clamping plate away from the drive plate. The rotating shaft is rotatably mounted on the inner wall of the disc box.

[0006] Furthermore, welding sleeves are rotatably provided on the inner side of the two sets of drive plates away from the clamping plate. The welding sleeves are fixedly installed on the inner wall of the adjusting ring. Two sets of movable frames are installed on the top of the adjusting ring. The rotating screw sleeve is rotatably arranged on the inner side of the movable frame.

[0007] Furthermore, a hydraulic cylinder is fixedly installed on the top of the common base by bolts, and a movable bracket is fixedly installed on the output end of the hydraulic cylinder. A positioning bracket is fixedly installed on the top of the common base away from the hydraulic cylinder by bolts, and the disc box is fixedly arranged inside the movable bracket and the positioning bracket.

[0008] Furthermore, a fixed plate is fixedly installed on one side of the movable bracket and the positioning bracket, and a number of limiting posts are installed on one side of the fixed plate, with the limiting posts located inside the movable bracket and the positioning bracket.

[0009] Furthermore, a tension / compression sensor assembly is provided between the movable bracket and the positioning bracket, and connecting rods are installed at both ends of the tension / compression sensor assembly. An insert rod is installed at the end of the connecting rod away from the tension / compression sensor assembly, and a locking component is movably provided on the inner side of the end of the insert rod away from the connecting rod.

[0010] Furthermore, the locking component includes a positioning pin, and an adjusting turntable is installed at the end of the positioning pin away from the fixed plate. An adjusting shaft is fixedly installed on one side of the adjusting turntable, and the adjusting shaft is rotatably disposed inside the positioning pin. Two sets of adjusting columns are installed in the middle section of the adjusting shaft.

[0011] Furthermore, the positioning pin has four sets of positioning blocks inside, the positioning blocks are movably embedded in the inner side of the insertion rod, and adjustment plates are installed on both sides of the positioning blocks.

[0012] Furthermore, a limiting guide rod is slidably provided in the middle of the adjusting plate, and the limiting guide rod is fixedly provided in the groove inside the positioning pin. The side of the adjusting plate away from the adjusting column is elastically connected to the groove inside the positioning pin through a return spring.

[0013] Furthermore, an oil supply box is installed on one side of the common base, and an oil tank is installed inside the oil supply box. The oil tank is connected to an oil suction filter through a pipe, and a plunger pump is installed on the side of the oil suction filter away from the oil tank through a pipe. A fine filter is installed on the side of the plunger pump away from the oil suction filter through a pipe, and a proportional directional valve is installed on one set of pipes on the side of the fine filter away from the plunger pump. An overflow valve is installed on another set of pipes on the side of the fine filter away from the plunger pump.

[0014] Furthermore, a cooler is installed on one set of pipes on the side of the overflow valve away from the fine filter, and a return check valve is installed on another set of pipes on the side of the overflow valve away from the fine filter. The return check valve and the cooler are connected by pipes, and the return check valve and the oil tank are connected by pipes. Two sets of pipes at the bottom of the proportional directional valve are connected to a hydraulically controlled check valve, which is fixedly connected to the hydraulic cylinder. Another set of pipes at the bottom of the proportional directional valve is connected to the oil tank. A combined check valve is connected to the pipes on the side of the fine filter, cooler, and overflow valve.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, through the coordination of a centering component and a hydraulic cylinder, facilitates the clamping of the insertion rod via an adjustable clamping structure. During clamping, the axis of the tension / compression sensor assembly coincides with that of the hydraulic cylinder, preventing additional bending moments during tension / compression that could affect accuracy and lifespan. A tool controls the rotation of the adjusting screw, which pushes the rotating sleeve outward. Simultaneously, this outward movement pushes the movable frame and adjusting ring to rotate along the inner side of the disc box. Due to the rotational combination of the internal rotating shaft and the disc box, the rotation of the adjusting ring drives the clamping plates to rotate along the welded sleeve via a drive plate. The three clamping plates simultaneously move towards the insertion rod, clamping and restricting it. This clamping method achieves centering, effectively preventing additional bending moments during prestressing that could reduce the accuracy and shorten the lifespan of the tension / compression sensor assembly.

[0016] This invention, through the combination of locking components and positioning pins, facilitates quick locking via insertion and rotation. This avoids the problem of prolonged installation and disassembly due to the need for bolts or fixing devices to restrict the positioning pin after direct insertion. The return spring inside the positioning pin pushes the adjusting plate and positioning block to embed inside the positioning pin. By rotating the adjusting shaft, the adjusting column pushes the positioning block outward, embedding it inside the positioning pin. This embedding method achieves the locking effect, preventing the positioning pin from loosening during device use and shortening installation and disassembly time. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the tensile and compressive force sensor assembly structure of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is a schematic cross-sectional view of the centering component of the present invention; Figure 5 This is a schematic cross-sectional view of the positioning bracket of the present invention; Figure 6 This is a schematic diagram of the oil supply box structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B; Figure 8 This is a schematic diagram of the adjusting shaft structure of the present invention.

[0018] In the diagram: 100, common base; 101, hydraulic cylinder; 102, movable bracket; 103, positioning bracket; 104, fixed plate; 105, limit post; 001. Centering assembly; 200. Disc box; 201. Fixing bracket; 202. Bearing bracket; 203. Adjusting screw; 204. Adjusting ring; 205. Movable bracket; 206. Rotating screw sleeve; 300. Clamping plate; 301. Welding sleeve; 302. Drive plate; 303. Rotating shaft; 002, Locking assembly; 400, Tension / compression sensor assembly; 401, Connecting rod; 402, Insert rod; 500. Positioning block; 501. Positioning pin; 502. Adjusting turntable; 503. Adjusting shaft; 504. Adjusting column; 505. Adjusting plate; 506. Return spring; 507. Limiting guide rod; 600. Hydraulic check valve; 601. Oil supply box; 602. Oil tank; 603. Suction filter; 604. Piston pump; 605. Fine filter; 606. Combined check valve; 607. Proportional directional valve; 608. Relief valve; 609. Cooler; 610. Return check valve. Detailed Implementation

[0019] The present invention will now be further described with reference to the accompanying drawings.

[0020] like Figures 1 to 8 As shown, the present invention provides a hydraulic dynamometer sensor assembly tension and compression device, including a common base 100, and two sets of centering components 001 are arranged above one end of the common base 100; The centering component 001 includes a disc box 200, and two sets of fixing brackets 201 are installed on the upper end of the disc box 200. A bearing bracket 202 is rotatably arranged inside the fixing bracket 201, and an adjusting screw 203 is rotatably arranged inside the bearing bracket 202. An adjusting ring 204 is rotatably arranged inside the disc box 200. A rotating screw sleeve 206 is rotatably arranged inside the upper end of the adjusting ring 204. The adjusting screw 203 is rotatably arranged inside the rotating screw sleeve 206. Six sets of drive plates 302 are rotatably arranged inside the adjusting ring 204. A clamping plate 300 is rotatably arranged inside the two sets of drive plates 302 away from the adjusting ring 204. A rotating shaft 303 is rotatably arranged at the end of the clamping plate 300 away from the drive plate 302. The rotating shaft 303 is rotatably arranged on the inner wall of the disc box 200.

[0021] Welding sleeves 301 are rotatably installed on the inner side of the two sets of drive plates 302 away from the clamping plate 300. Welding sleeves 301 are fixedly installed on the inner wall of the adjusting ring 204. Two sets of movable frames 205 are installed on the top of the adjusting ring 204. Rotating screw sleeves 206 are rotatably installed on the inner side of the movable frames 205.

[0022] Using the above scheme: the common base 100 can provide support and installation position for the top structure; the disc box 200 can provide restriction for the inner structure; the fixing frame 201 can restrict the bearing frame 202 and assist the bearing frame 202 in rotation adjustment; the inner adjusting screw 203 can be adjusted by rotation; the adjusting ring 204 rotates inside the disc box 200, and the rotation can change the position of the welding sleeve 301; the welding sleeve 301 can push the drive plate 302 for adjustment; during the adjustment process, the drive plate 302 will control the clamping plate 300 to flip and adjust along the rotating shaft 303; during the flipping of the rotating shaft 303, the inner insert rod 402 will be centered and clamped; the movable frame 205 can restrict the inner rotating screw sleeve 206; the rotating screw sleeve 206 can drive the adjusting ring 204 to rotate and adjust along the inner side of the disc box 200 under the action of the adjusting screw 203.

[0023] like Figure 2 and Figure 4 As shown, a hydraulic cylinder 101 is fixedly installed on the top of the common base 100 by bolts, and a movable bracket 102 is fixedly installed on the output end of the hydraulic cylinder 101. A positioning bracket 103 is fixedly installed on the top of the common base 100 away from the hydraulic cylinder 101 by bolts. The disc box 200 is fixedly arranged inside the movable bracket 102 and the positioning bracket 103.

[0024] A fixed plate 104 is fixedly installed on one side of the movable bracket 102 and the positioning bracket 103. Several sets of limiting posts 105 are installed on one side of the fixed plate 104, and the limiting posts 105 are located inside the movable bracket 102 and the positioning bracket 103.

[0025] A tension / compression sensor assembly 400 is provided between the movable bracket 102 and the positioning bracket 103, and connecting rods 401 are installed at both ends of the tension / compression sensor assembly 400. An insertion rod 402 is installed at the end of the connecting rod 401 away from the tension / compression sensor assembly 400, and a locking component 002 is movably provided on the inner side of the end of the insertion rod 402 away from the connecting rod 401.

[0026] The above scheme is adopted as follows: the hydraulic cylinder 101 can adjust the position of the movable bracket 102 through hydraulic control, the movable bracket 102 can restrict the disc box 200, and the positioning bracket 103 can also restrict the disc box 200. The two brackets, together with the positioning pin 501, can position the insertion rod 402 to prevent it from falling off. The fixed plate 104 can install the limiting post 105 on the inner side of the movable bracket 102 and the positioning bracket 103. The limiting post 105 can restrict the positioning pin 501 to prevent the positioning pin 501 from rotating. The tension and compression sensor assembly 400 can detect the tension and compression. The connecting rod 401 can connect the insertion rod 402 to the tension and compression sensor assembly 400, which facilitates assembly and connection with the prestressing device.

[0027] like Figure 3 , Figure 5 and Figure 8 As shown, the locking assembly 002 includes a positioning pin 501, and an adjusting turntable 502 is installed at the end of the positioning pin 501 away from the fixed plate 104. An adjusting shaft 503 is fixedly installed on one side of the adjusting turntable 502, and the adjusting shaft 503 is rotatably disposed inside the positioning pin 501. Two sets of adjusting columns 504 are installed in the middle section of the adjusting shaft 503.

[0028] The positioning pin 501 has four sets of positioning blocks 500 inside. The positioning blocks 500 are movably embedded in the inner side of the insertion rod 402. Adjustment plates 505 are installed on both sides of the positioning blocks 500.

[0029] A limiting guide rod 507 is slidably provided in the middle of the adjusting plate 505. The limiting guide rod 507 is fixedly provided in the groove inside the positioning pin 501. The side of the adjusting plate 505 away from the adjusting column 504 is elastically connected to the groove inside the positioning pin 501 through a reset spring 506.

[0030] Using the above scheme: After the positioning pin 501 is inserted into the insert rod 402 and combined with the inner side of the movable bracket 102 or the positioning bracket 103, the adjusting turntable 502 can provide a grip for the user, making it convenient to control the rotation of the adjusting shaft 503. The adjusting column 504 is a cuboid with curved edges. During the rotation, it will push the positioning block 500 to extend outward for adjustment. The adjusting plate 505 on the side of the positioning block 500 can be embedded in the inner side of the positioning pin 501 under the push of the return spring 506. The limiting guide rod 507 can limit the adjusting plate 505 and maintain the stability of the lateral adjustment.

[0031] like Figure 6 and Figure 7 As shown, an oil supply box 601 is installed on one side of the common base 100, and an oil tank 602 is installed inside the oil supply box 601. The oil tank 602 is connected to an oil suction filter 603 through a pipe. A plunger pump 604 is installed on the side of the oil suction filter 603 away from the oil tank 602 through a pipe. A fine filter 605 is installed on the side of the plunger pump 604 away from the oil suction filter 603 through a pipe. A proportional directional valve 607 is installed on one set of pipes on the side of the fine filter 605 away from the plunger pump 604, and an overflow valve 608 is installed on another set of pipes on the side of the fine filter 605 away from the plunger pump 604.

[0032] A cooler 609 is installed on one set of pipes on the side of the overflow valve 608 away from the fine filter 605. A return check valve 610 is installed on another set of pipes on the side of the overflow valve 608 away from the fine filter 605. The return check valve 610 and the cooler 609 are connected by pipes. The return check valve 610 and the oil tank 602 are connected by pipes. Two sets of pipes at the bottom of the proportional directional valve 607 are connected to a hydraulically controlled check valve 600. The hydraulically controlled check valve 600 is fixedly connected to the hydraulic cylinder 101. Another set of pipes at the bottom of the proportional directional valve 607 is connected to the oil tank 602. A combination check valve 606 is connected to the pipes on the side of the fine filter 605, the cooler 609, and the overflow valve 608.

[0033] The above scheme employs the following: the oil supply box 601 provides an installation location for the internal structure; the oil tank 602 stores hydraulic oil; the suction filter 603 and the fine filter 605 filter the hydraulic oil; the plunger pump 604, driven by a motor, transmits the hydraulic oil from the pipeline; the proportional directional valve 607 controls the flow direction of the hydraulic oil, thereby controlling the adjustment of the hydraulic cylinder 101; the hydraulic control check valve 600 controls the unidirectional flow of the hydraulic oil; the overflow valve 608 guides the overflow of hydraulic oil, which is then cooled by the cooler 609 and finally returned by the return check valve 610; the output pipe of the cooler 609 is equipped with a combination check valve 606; the pipe between the proportional directional valve 607 and the fine filter 605 is also equipped with a combination check valve 606; the pipes at both ends of the cooler 609 are connected by a separate set of pipes, each equipped with a combination check valve 606; and the combination check valve 606 simultaneously controls the transmission of hydraulic oil.

[0034] The working principle and usage process of this invention are as follows: Two sets of insertion rods 402 are inserted into the inner sides of the movable bracket 102 and the positioning bracket 103 respectively. The position is adjusted with the assistance of the hydraulic cylinder 101. Then, the adjusting turntable 502 drives the positioning pin 501 to be inserted into the inner side of the movable bracket 102 or the positioning bracket 103. After insertion, the adjusting turntable 502 is rotated, which controls the rotation of the rotating shaft 303. During rotation, the two sets of adjusting columns 504 push the positioning block 500 outward. After unfolding, the positioning block 500 locks the positioning pin 501. Then, the adjusting screw 203 is rotated by controlling the screwdriver. During the rotation, the rotating sleeve 206 will be extended outward. During the adjustment of the extension, the adjusting ring 204 is controlled to rotate along the inner side of the disc box 200. During the rotation, the welding sleeve 301 controls the clamping plate 300 to flip along the rotating shaft 303 through the drive plate 302. During the flipping, the insertion rod 402 will be clamped and centered. Finally, the movable bracket 102 is controlled to move by the hydraulic cylinder 101. During the movement, the tension and pressure sensor assembly 400 will be provided with tension and pressure.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A hydraulic dynamometer sensor assembly tension / compression device, comprising a common base (100), characterized in that: Two sets of centering components (001) are provided above one end of the common base (100); The centering assembly (001) includes a disc box (200), and two sets of fixing brackets (201) are installed on the upper end of the disc box (200). A bearing bracket (202) is rotatably mounted on the inner side of each fixing bracket (201), and an adjusting screw (203) is rotatably mounted on the inner side of the bearing bracket (202). An adjusting ring (204) is rotatably mounted on the inner side of the disc box (200), and a rotating screw sleeve (206) is rotatably mounted on the inner side of the upper end of the adjusting ring (204). The adjusting screw (203) is rotatably disposed inside the rotating screw sleeve (206). Six sets of driving plates (302) are rotatably disposed inside the adjusting ring (204). Clamping plates (300) are rotatably disposed inside the two sets of driving plates (302) away from the adjusting ring (204). A rotating shaft (303) is rotatably disposed at the end of the clamping plate (300) away from the driving plate (302). The rotating shaft (303) is rotatably disposed on the inner wall of the disc box (200).

2. The hydraulic dynamometer sensor assembly tension / compression device according to claim 1, characterized in that: Welding sleeves (301) are rotatably provided on the inner side of the two sets of drive plates (302) away from the clamping plate (300). The welding sleeves (301) are fixedly installed on the inner wall of the adjusting ring (204). Two sets of movable frames (205) are installed on the top of the adjusting ring (204). The rotating screw sleeve (206) is rotatably provided on the inner side of the movable frame (205).

3. The hydraulic dynamometer sensor assembly tension / compression device according to claim 1, characterized in that: A hydraulic cylinder (101) is fixedly installed on the top of the common base (100) by bolts, and a movable bracket (102) is fixedly installed on the output end of the hydraulic cylinder (101). A positioning bracket (103) is fixedly installed on the top of the common base (100) away from the hydraulic cylinder (101) by bolts. The disc box (200) is fixedly arranged inside the movable bracket (102) and the positioning bracket (103).

4. The hydraulic dynamometer sensor assembly tension / compression device according to claim 3, characterized in that: A fixed plate (104) is fixedly installed on one side of the movable bracket (102) and the positioning bracket (103). Several sets of limiting posts (105) are installed on one side of the fixed plate (104), and the limiting posts (105) are located inside the movable bracket (102) and the positioning bracket (103).

5. The hydraulic dynamometer sensor assembly tension / compression device according to claim 4, characterized in that: A tension / compression sensor assembly (400) is provided between the movable bracket (102) and the positioning bracket (103), and a connecting rod (401) is installed at both ends of the tension / compression sensor assembly (400). A plug rod (402) is installed at the end of the connecting rod (401) away from the tension / compression sensor assembly (400), and a locking component (002) is movably provided on the inner side of the end of the plug rod (402) away from the connecting rod (401).

6. The hydraulic dynamometer sensor assembly tension / compression device according to claim 5, characterized in that: The locking assembly (002) includes a positioning pin (501), and an adjusting turntable (502) is installed at one end of the positioning pin (501) away from the fixed plate (104). An adjusting shaft (503) is fixedly installed on one side of the adjusting turntable (502), and the adjusting shaft (503) is rotatably disposed inside the positioning pin (501). Two sets of adjusting columns (504) are installed in the middle section of the adjusting shaft (503).

7. The hydraulic dynamometer sensor assembly tension / compression device according to claim 6, characterized in that: The positioning pin (501) has four sets of positioning blocks (500) inside. The positioning blocks (500) are movably embedded in the inner side of the insert rod (402). Adjustment plates (505) are installed on both sides of the positioning blocks (500).

8. The hydraulic dynamometer sensor assembly tension / compression device according to claim 7, characterized in that: A limiting guide rod (507) is slidably provided in the middle of the adjusting plate (505). The limiting guide rod (507) is fixedly provided in the inner side of the slot inside the positioning pin (501). The side of the adjusting plate (505) away from the adjusting column (504) is elastically connected to the slot inside the positioning pin (501) through a reset spring (506).

9. The hydraulic dynamometer sensor assembly tension / compression device according to claim 3, characterized in that: An oil supply box (601) is installed on one side of the common base (100), and an oil tank (602) is installed inside the oil supply box (601). The oil tank (602) is connected to an oil suction filter (603) through a pipe. A plunger pump (604) is installed on the side of the oil suction filter (603) away from the oil tank (602) through a pipe. A fine filter (605) is installed on the side of the plunger pump (604) away from the oil suction filter (603) through a pipe. A proportional directional valve (607) is installed on one set of pipes on the side of the fine filter (605) away from the plunger pump (604). An overflow valve (608) is installed on another set of pipes on the side of the fine filter (605) away from the plunger pump (604).

10. The hydraulic dynamometer sensor assembly tension / compression device according to claim 9, characterized in that: A cooler (609) is installed on one set of pipes on the side of the overflow valve (608) away from the fine filter (605). A return check valve (610) is installed on another set of pipes on the side of the overflow valve (608) away from the fine filter (605). The return check valve (610) and the cooler (609) are connected by pipes. The return check valve (610) and the oil tank (602) are connected by pipes. Two sets of pipes at the bottom of the proportional directional valve (607) are connected to a hydraulically controlled check valve (600). The hydraulically controlled check valve (600) is fixedly connected to the hydraulic cylinder (101). Another set of pipes at the bottom of the proportional directional valve (607) is connected to the oil tank (602). A combined check valve (606) is connected to the pipes on the side of the fine filter (605), the cooler (609), and the overflow valve (608).

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