Torque testing device for power takeoff

Abstract

The invention belongs to the technical field of power takeoff production, and particularly discloses a torque testing device for a power takeoff, which comprises a transmission case, a top cover is arranged at the top of the transmission case, a rotating shaft is arranged in the transmission case, and an induction assembly is arranged in the transmission case. A movable cavity is formed in the position, close to the edge of one side, of the interior of the transmission box, a testing assembly is arranged in the movable cavity, an adjusting cavity is formed in the position, located on one side of the movable cavity, of the interior of the transmission box, and a feedback assembly is arranged in the adjusting cavity; according to the invention, through the arrangement of the sensing assembly, the testing assembly and the feedback assembly, a power supply can be cut off in time when a maximum testing value is reached during testing, so that damage to testing equipment caused by large torque is prevented, the torque generated by the tested equipment is qualified, and a stable value when the generated torque is small can be measured; and when the torque generated by the equipment is small, the equipment is unqualified.

Description

Technical Field

[0001] The present invention relates to the technical field of power take-off production, and particularly relates to a torque testing device for a power take-off. Background Art

[0002] A power take-off is a set of one or more speed-changing gears, also known as a power output device. Generally, it is composed of a gearbox, a clutch, and a controller, and is connected to the low-speed gear of the gearbox or the output shaft of the auxiliary box to output power to an external working device, such as a lifting pump, etc. When producing a power take-off, in order to ensure that the power take-off can normally receive external torque during operation, it is necessary to conduct a torque test on it.

[0003] Currently, when conducting a torque test on a power take-off, it is usually necessary to dock the end of the power take-off with the test equipment. However, when the torque of the power take-off is large, the test equipment cannot timely cut off the power output at the docking part, resulting in damage to the docking part by the large torque. When the torque is small, it is impossible to accurately obtain the stable value during its rotation, which is not convenient for subsequent rework and repair. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a torque testing device for a power take-off.

[0005] To achieve the above object, the present invention adopts the following technical solution: A torque testing device for a power take-off, including a transmission box, a top cover is arranged on the top of the transmission box, a rotating shaft is arranged inside the transmission box, a sensing component is arranged inside the transmission box, an activity cavity is opened near one side edge inside the transmission box, a testing component is arranged inside the activity cavity, an adjustment cavity is opened on one side of the activity cavity inside the transmission box, and a feedback component is arranged inside the adjustment cavity; The top of the rotating shaft penetrates above the top cover, the bottom of the rotating shaft penetrates below the transmission box, flange covers are arranged on the top of the top cover and the bottom of the transmission box, both ends of the rotating shaft are correspondingly located inside the flange covers, an electrical interface is opened near one side edge on the top of the top cover, and copper columns are fixed on the inner bottom surface of the electrical interface near both side edges.

[0006] Preferably, a copper plate is fixed on the outer surface of one of the copper columns, the bottom of the copper plate is attached to the inner bottom surface of the electrical interface, a spring copper sheet is fixed on the outer surface of the other copper column, one end of the spring copper sheet extends to the top of the copper plate, the bottom of the spring copper sheet is attached to the top of the copper plate, and a through hole is opened on the inner bottom surface of the electrical interface, and the through hole penetrates into the activity cavity.

[0007] Preferably, the induction component includes an annular ring, the annular ring is slidably connected to the inner wall component of the transmission box, the bottom of the annular ring is inclined near one side edge, an annular raceway is formed in the inclined surface at the bottom of the annular ring, a plurality of supporting blocks are arranged equidistantly along the circumferential direction at the bottom of the annular ring, rolling balls are rotatably arranged on the tops of the plurality of supporting blocks, and the plurality of rolling balls are correspondingly rollingly connected to the inside of the annular raceway.

[0008] Preferably, a plurality of load-bearing blocks are fixedly arranged equidistantly along the circumferential direction on the outer surface of the rotating shaft, telescopic rods are rotatably arranged at the bottoms of the plurality of load-bearing blocks, and one ends of the plurality of telescopic rods are rotatably connected to the other sides of the supporting blocks.

[0009] Preferably, the testing component includes a push plate, the push plate is slidably arranged inside the movable cavity, a guiding opening is formed in one inner wall of the movable cavity, one side of the guiding opening penetrates through to the inside of the transmission box, a guiding block is slidably arranged between the two inner walls of the guiding opening, one side of the guiding block is fixed on the push plate, the other side of the guiding block is fixed on the annular ring, and a bayonet is formed on the outer surface of the push plate near the guiding block.

[0010] Preferably, a waist-shaped groove penetrating from the front side to the rear side is obliquely formed in the front side of the push plate, a sliding rod is slidably arranged between the two inner walls of the waist-shaped groove, both ends of the sliding rod correspondingly extend to the front and rear sides of the push plate, a scale plate is arranged on one side of the transmission box, one end of the scale plate slidably penetrates through to the inside of the movable cavity, both ends of one end of the scale plate are close to the edges of the front and rear sides and extend to both ends of the sliding rod and are fixedly connected to both ends of the sliding rod, and an electric wooden block is fixed on the top of the push plate, and the electric wooden block is located directly below the through opening.

[0011] Preferably, the feedback component includes a bent clamping plate, the bent clamping plate is slidably arranged near one side edge inside the adjustment cavity, the bottom end of the bent clamping plate slidably penetrates through to the inside of the movable cavity, one side of the bottom end of the bent clamping plate is in fit with the outer surface of the push plate, a dial plate is fixed on the top of the bent clamping plate, and one end of the dial plate slidably penetrates through to the inside of the movable cavity and is located directly below the adjustment opening.

[0012] Preferably, a side cavity is formed at the top of the adjustment cavity, a sliding plate is slidably arranged between the inner walls of the side cavity, the bottom of the sliding plate is fixedly connected to the top of the bent clamping plate, a return spring is fixed on one side of the sliding plate, one end of the return spring is fixed on one inner wall of the side cavity, and a bridge interface penetrating from the top to the bottom is formed in the sliding plate.

[0013] Preferably, a flow channel is provided on the inner wall of the transmission case on one side of the adjustment cavity. The bottom of the flow channel penetrates to the top of the guide port, and the top of the flow channel penetrates to the inner bottom surface of the side cavity. An oil cavity is provided inside the top cover. An oil inlet is provided on the inner bottom surface of the oil cavity. The oil inlet penetrates to the inside of the side cavity. A feed pipe fixed to penetrate through the top of the top cover to the inside of the oil cavity, and the oil inlet is directly above the flow channel.

[0014] Preferably, a docking groove is provided on the inner top surface of the guide port. The docking groove communicates with the bottom of the flow channel. A diversion cavity is provided on the inner bottom surface of the guide port. A sewage discharge port is provided on the inner bottom surface of the diversion cavity. One end of the sewage discharge port penetrates to the outside of the transmission case. An annular groove is provided on the inner bottom surface of the transmission case. A bent hole is provided on the inner bottom surface of the annular groove. One end of the bent hole penetrates to the inside of the diversion cavity. A bridge connecting pipe is provided inside the guide block. The bottom of the bridge connecting pipe extends to the inside of the diversion cavity. The top of the bridge connecting pipe extends above the guide block and is directly below the docking groove. A throttling small hole penetrating to the inside of the annular raceway is provided on one inner wall of the bridge connecting pipe. The bottom of the bridge connecting pipe is closed.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. By providing an induction component, a test component and a feedback component, the present invention can cut off the power supply in time when the maximum test value is reached during the test, thereby preventing damage to the test equipment caused by a large torque. At the same time, it also indicates that the torque generated by the equipment under test is qualified, and the stable value when the generated torque is small can also be measured, which is convenient for subsequent repair and maintenance. When the equipment generates a small torque, it also indicates that the equipment is unqualified; 2. By providing an induction component, the present invention can inductively measure the generated torque, and then drive the test component to work to obtain the measured value. When the induction component works, first dock the rotating shaft with the output end of the power take-off to be tested. The torque generated by the power take-off to be tested drives the rotating shaft to rotate. The greater the generated torque, the greater the rotational inertia generated by driving the rotating shaft to rotate. The generated rotational inertia will drive multiple supporting blocks, telescopic rods, balls and the annular ring to slide upward. During the upward sliding of the annular ring, the test component will be driven to work; 3. By providing a test component, the present invention can numericalize the torque magnitude sensed by the induction component, which is convenient for people to read. At the same time, when the torque is large, the feedback component is driven to work while the power supply is cut off, thereby avoiding damage to the test mechanical device caused by the continuous increase of the torque; 4. By providing a feedback component, the present invention can cut off the power supply in time after the equipment generates a large torque and the test is qualified. At the same time, the test component is positioned, and then the induction component is cooled and maintained and the generated dirty oil is discharged. Description of the Drawings

[0016] Figure 1 This is a top-down three-dimensional structural schematic diagram of a torque testing device for a power take-off Figure 2 This is a bottom-up three-dimensional structural schematic diagram of a torque testing device for a power take-off Figure 3 This is a one-side sectional three-dimensional structural schematic diagram of a torque testing device for a power take-off Figure 4 This is the other-side sectional three-dimensional structural schematic diagram of a torque testing device for a power take-off Figure 5 This is a front-view three-dimensional structural schematic diagram of a rotating shaft and an annular ring in a torque testing device for a power take-off Figure 6 This is a sectional three-dimensional structural schematic diagram of a rotating shaft and an annular ring in a torque testing device for a power take-off Figure 7 For the present invention Figure 3 The partial enlarged view at position A in Figure 8 For the present invention Figure 3 The partial enlarged view at position B in

[0017] In the figure: 1. Transmission case; 2. Top cover; 3. Flange cover plate; 4. Rotating shaft; 5. Electrical interface; 6. Copper column; 7. Adjusting port; 8. Copper plate; 9. Spring copper sheet; 10. Scale plate; 11. Drain port; 12. Through port; 13. Activity cavity; 14. Push plate; 15. Electrical wood block; 16. Waist-shaped groove; 17. Slide bar; 18. Feed pipe; 19. Guide port; 20. Load block; 21. Telescopic rod; 22. Annular ring; 23. Support block; 24. Annular raceway; 25. Ball; 26. Oil cavity; 27. Adjusting cavity; 28. Paddle; 29. Oil inlet; 30. Bending clamping plate; 31. Side cavity; 32. Slide plate; 33. Bridge interface; 34. Return spring; 35. Flow channel; 36. Docking groove; 37. Bayonet; 38. Guide block; 39. Bridge connecting pipe; 40. Diversion cavity; 41. Bending hole; 42. Annular groove; 43. Throttle orifice. Detailed implementation mode

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figures 1-8, the present invention provides a technical solution: a torque testing device for a power take-off, including a transmission case 1, a top cover 2 is arranged on the top of the transmission case 1, a rotating shaft 4 is arranged inside the transmission case 1, an induction component is arranged inside the transmission case 1, an activity cavity 13 is opened near one side edge inside the transmission case 1, a testing component is arranged inside the activity cavity 13, and an adjustment cavity 27 is opened on one side of the activity cavity 13 inside the transmission case 1, and a feedback component is arranged inside the adjustment cavity 27; The top of the rotating shaft 4 penetrates above the top cover 2, the bottom of the rotating shaft 4 penetrates below the transmission case 1, flange covers 3 are arranged on the top of the top cover 2 and the bottom of the transmission case 1, both ends of the rotating shaft 4 are correspondingly located inside the flange covers 3, an electrical interface 5 is opened near one side edge on the top of the top cover 2, copper columns 6 are fixed on the inner bottom surface of the electrical interface 5 near both side edges, a copper plate 8 is fixed on the outer surface of one of the copper columns 6, the bottom of the copper plate 8 is attached to the inner bottom surface of the electrical interface 5, a spring copper sheet 9 is fixed on the outer surface of the other copper column 6, one end of the spring copper sheet 9 extends to the top of the copper plate 8, the bottom of the spring copper sheet 9 is attached to the top of the copper plate 8, and a through hole 12 is opened on the inner bottom surface of the electrical interface 5, and the through hole 12 penetrates into the inside of the activity cavity 13.

[0020] The achieved effect is that by providing an induction component, a testing component and a feedback component, the power supply can be cut off in time when the maximum test value is reached during the test, thereby preventing damage to the test equipment caused by a large torque, and at the same time indicating that the torque generated by the equipment under test is qualified, and it can also measure the stable value when the generated torque is small, which is convenient for subsequent repair and maintenance. When the equipment generates a small torque, it also indicates that this equipment is unqualified, solving the problem that the current test equipment cannot cut off the power output of the docking part in time when the torque of the power take-off is large during the test process, resulting in damage to the docking part by the large torque, and when the torque is small, the stable value during its rotation cannot be accurately obtained, which is not convenient for subsequent rework and repair.

[0021] Such as Figure 4 , Figure 5 , Figure 6 and Figure 8 As shown in

[0022] The achieved effect is as follows. First, the rotating shaft 4 is docked with the output end of the power take-off to be tested. The torque generated by the power take-off to be tested drives the rotation of the rotating shaft 4. The greater the generated torque, the greater the rotational inertia driven by the rotation of the rotating shaft 4. The generated rotational inertia will drive multiple supporting blocks 23, telescopic rods 21, balls 25 and the annular ring 22 to slide upward. During the upward sliding process of the annular ring 22, it will drive the test assembly to work.

[0023] Such as Figure 1 , Figure 3 , Figure 4 and Figure 8 As shown, the test assembly includes a push plate 14. The push plate 14 is slidably arranged inside the movable cavity 13. A guiding port 19 is opened on one inner wall of the movable cavity 13. One side of the guiding port 19 penetrates through to the inside of the transmission case 1. A guiding block 38 is slidably arranged between the two inner walls of the guiding port 19. One side of the guiding block 38 is fixed to the push plate 14, and the other side of the guiding block 38 is fixed to the annular ring 22. A bayonet 37 is opened on the outer surface of the push plate 14 close to the guiding block 38. A waist-shaped groove 16 is obliquely opened on the front side of the push plate 14 and penetrates through to the rear side. A sliding rod 17 is slidably arranged between the two inner walls of the waist-shaped groove 16. Both ends of the sliding rod 17 correspondingly extend to the front and rear sides of the push plate 14. A scale plate 10 is arranged on one side of the transmission case 1. One end of the scale plate 10 slidably penetrates through to the inside of the movable cavity 13. One end of the scale plate 10 extends to both ends of the sliding rod 17 near the front and rear side edges and is fixed to both ends of the sliding rod 17. An electric wooden block 15 is fixed to the top of the push plate 14. The electric wooden block 15 is located directly below the through port 12.

[0024] The achieved effect is that when the annular ring 22 slides upward, it will drive the guiding block 38 and the push plate 14 to slide upward together. During the upward sliding process of the push plate 14, since the sliding rod 17 is still sliding and stuck inside the waist-shaped groove 16, and the waist-shaped groove 16 is obliquely opened on the push plate 14, the sliding rod 17 can be pushed outward from the transmission case 1 during the upward sliding process of the push plate 14, thereby pushing the scale plate 10 outward and causing its value to change. The generated value change is the measured rotational torque, which is convenient for people to record.

[0025] Such as Figure 3 , Figure 4 , Figure 7 and Figure 8As shown in the figure, the feedback component includes a bent clamping plate 30 which is slidably arranged near one side edge inside the adjustment cavity 27. The bottom end of the bent clamping plate 30 slidably penetrates into the inside of the movable cavity 13. One side of the bottom end of the bent clamping plate 30 is attached to the outer surface of the push plate 14. A dial plate 28 is fixed to the top of the bent clamping plate 30. One end of the dial plate 28 slidably penetrates into the inside of the movable cavity 13 and is located directly below the adjustment port 7. A side cavity 31 is opened at the top of the adjustment cavity 27. A sliding plate 32 is slidably arranged between the inner walls of the side cavity 31. The bottom of the sliding plate 32 is fixedly connected to the top of the bent clamping plate 30. A return spring 34 is fixed to one side of the sliding plate 32. One end of the return spring 34 is fixed to one inner wall of the side cavity 31. A bridge interface 33 is opened at the top of the sliding plate 32 and penetrates to the bottom. A flow channel 35 is opened on the inner wall of the transmission box 1 on one side of the adjustment cavity 27. The bottom of the flow channel 35 penetrates to the top of the guiding port 19. The top of the flow channel 35 penetrates to the inner bottom surface of the side cavity 31. An oil cavity 26 is opened inside the top cover 2. An oil inlet 29 is opened on the inner bottom surface of the oil cavity 26 and penetrates to the inside of the side cavity 31. A feed pipe 18 which is fixedly penetrated to the inside of the oil cavity 26 is fixed to the top of the top cover 2. The oil inlet 29 is located directly above the flow channel 35. A docking groove 36 is opened on the inner top surface of the guiding port 19 and is communicated with the bottom of the flow channel 35. A diversion cavity 40 is opened on the inner bottom surface of the guiding port 19. A sewage discharge port 11 is opened on the inner bottom surface of the diversion cavity 40. One end of the sewage discharge port 11 penetrates to the outside of the transmission box 1. An annular groove 42 is opened on the inner bottom surface of the transmission box 1. A bent hole 41 is opened on the inner bottom surface of the annular groove 42. One end of the bent hole 41 penetrates to the inside of the diversion cavity 40. A bridge connecting pipe 39 is arranged inside the guiding block 38. The bottom of the bridge connecting pipe 39 extends to the inside of the diversion cavity 40. The top of the bridge connecting pipe 39 extends above the guiding block 38 and is located directly below the docking groove 36. A throttling small hole 43 which penetrates to the inside of the annular raceway 24 is opened on one inner wall of the bridge connecting pipe 39. The bottom of the bridge connecting pipe 39 is in a closed shape.

[0026] The achieved effect is that when the push plate 14 slides above the movable cavity 13, the top of the bridge connecting pipe 39 will be clamped inside the docking groove 36. The bottom of the bridge connecting pipe 39 slides upward from the inside of the diversion cavity 40, so that the bent hole 41 is communicated with the diversion cavity 40. Driven by the elastic force of the return spring 34, the sliding plate 32 slides toward the adjustment port 7. During the sliding process, the bottom end of the bent clamping plate 30 will be clamped inside the bayonet 37. At the same time, the oil inlet 29 and the flow channel 35 are communicated through the bridge interface 33. At this time, the lubricating and cooling oil liquid located inside the oil cavity 26 can enter the inside of the bridge connecting pipe 39, and then flow into the inside of the annular raceway 24 through the throttling small hole 43 to lubricate and cool the inside of the annular raceway 24. The dirty oil liquid after lubrication and cooling falls into the annular groove 42, and then flows into the diversion cavity 40 through the bent hole 41, and finally is discharged from the sewage discharge port 11.

[0027] Working principle: When using this device, first inject the cooling lubricating oil into the interior of the oil cavity 26, and then dock the rotating shaft 4 with the output end of the power take-off to be tested. The torque generated by the power take-off to be tested drives the rotation of the rotating shaft 4. The greater the generated torque, the greater the rotational inertia driven by the rotation of the rotating shaft 4. The generated rotational inertia drives multiple supporting blocks 23, telescopic rods 21, balls 25, and the annular ring 22 to slide upward. When the annular ring 22 slides upward, it drives the guide block 38 and the push plate 14 to slide upward together. During the upward sliding process of the push plate 14, since the sliding rod 17 is still slidably clamped inside the waist-shaped groove 16, and the waist-shaped groove 16 is inclinedly arranged on the push plate 14, the sliding rod 17 can be pushed outward from the transmission case 1 during the upward sliding process of the push plate 14, thereby pushing the scale plate 10 outward and causing its value to change. The generated value change is the measured rotational torque, which is convenient for people to record. When the push plate 14 slides above the movable cavity 13, the top of the bridge connecting pipe 39 is clamped inside the docking groove 36, and the bottom of the bridge connecting pipe 39 slides upward from the interior of the diversion cavity 40, making the bending hole 41 communicate with the diversion cavity 40. Under the elastic force of the return spring 34, the slide plate 32 is driven to slide toward the adjustment port 7. During the sliding process, the bottom end of the bending clamping plate 30 is clamped inside the clamping port 37, and at the same time, the oil inlet 29 and the flow channel 35 are connected through the bridge interface 33. At this time, the lubricating and cooling oil in the oil cavity 26 can enter the bridge connecting pipe 39, then flow into the annular raceway 24 through the throttle orifice 43 to lubricate and cool the interior of the annular raceway 24. The contaminated oil after lubrication and cooling falls into the annular groove 42, then flows into the diversion cavity 40 through the bending hole 41, and finally is discharged from the sewage outlet 11.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A torque testing device for a power take-off, characterized in that, It includes a transmission case (1), a top cover (2) is provided on the top of the transmission case (1), a rotating shaft (4) is provided inside the transmission case (1), an induction component is provided inside the transmission case (1), an activity cavity (13) is opened near one side edge inside the transmission case (1), a test component is provided inside the activity cavity (13), an adjustment cavity (27) is opened on one side of the activity cavity (13) inside the transmission case (1), and a feedback component is provided inside the adjustment cavity (27). The top of the rotating shaft (4) penetrates above the top cover (2), the bottom of the rotating shaft (4) penetrates below the transmission case (1), flange covers (3) are provided on the top of the top cover (2) and the bottom of the transmission case (1), both ends of the rotating shaft (4) are correspondingly located inside the flange covers (3), an electrical interface (5) is opened near one side edge on the top of the top cover (2), and copper columns (6) are fixed on the inner bottom surface of the electrical interface (5) near both side edges.

2. The torque testing device for a power take-off according to claim 1, characterized in that: A copper plate (8) is fixed on the outer surface of one of the copper columns (6), the bottom of the copper plate (8) is attached to the inner bottom surface of the electrical interface (5), a spring copper sheet (9) is fixed on the outer surface of the other copper column (6), one end of the spring copper sheet (9) extends to the top of the copper plate (8), the bottom of the spring copper sheet (9) is attached to the top of the copper plate (8), and a through hole (12) is opened on the inner bottom surface of the electrical interface (5), and the through hole (12) penetrates to the inside of the activity cavity (13).

3. The torque testing device for a power take-off according to claim 2, characterized in that: The induction component includes an annular ring (22), the annular ring (22) is slidably connected to the inner wall component of the transmission case (1), the bottom of the annular ring (22) is inclined near one side edge, an annular raceway (24) is opened on the inclined surface at the bottom of the annular ring (22), a plurality of supporting blocks (23) are arranged equidistantly along the circumferential direction at the bottom of the annular ring (22), and rolling balls (25) are rotatably arranged on the top of the plurality of supporting blocks (23), and the plurality of rolling balls (25) are correspondingly rollingly connected to the inside of the annular raceway (24).

4. A torque testing device for a power take-off according to claim 3, characterized in that: A plurality of load blocks (20) are fixedly arranged equidistantly along the circumferential direction on the outer surface of the rotating shaft (4), telescopic rods (21) are rotatably arranged at the bottom of the plurality of load blocks (20), and one end of each of the plurality of telescopic rods (21) is rotatably connected to the other side of the supporting block (23).

5. A torque testing device for a power take-off according to claim 4, characterized in that: The test component includes a push plate (14), the push plate (14) is slidably arranged inside the activity cavity (13), a guiding opening (19) is opened on one inner wall of the activity cavity (13), one side of the guiding opening (19) penetrates to the inside of the transmission case (1), a guiding block (38) is slidably arranged between the two inner walls of the guiding opening (19), one side of the guiding block (38) is fixed on the push plate (14), the other side of the guiding block (38) is fixed on the annular ring (22), and a bayonet (37) is opened on the outer surface of the push plate (14) near the guiding block (38).

6. The torque testing device for a power take-off according to claim 5, characterized in that: A waist-shaped groove (16) penetrating from the front side to the rear side is obliquely formed on the front side of the push plate (14). A sliding rod (17) is slidably arranged between the inner walls on both sides of the waist-shaped groove (16). Both ends of the sliding rod (17) correspondingly extend to the front and rear sides of the push plate (14). A scale plate (10) is arranged on one side of the transmission box (1). One end of the scale plate (10) slidably penetrates into the interior of the movable cavity (13). One end of the scale plate (10) extends to both ends of the sliding rod (17) near the edges on the front and rear sides, and is fixed to both ends of the sliding rod (17). An electric wooden block (15) is fixed to the top of the push plate (14). The electric wooden block (15) is located directly below the through port (12).

7. A torque testing device for a power take-off according to claim 6, characterized in that: The feedback assembly includes a bent clamping plate (30). The bent clamping plate (30) is slidably arranged near one side edge inside the adjustment cavity (27). The bottom end of the bent clamping plate (30) slidably penetrates into the interior of the movable cavity (13). One side of the bottom end of the bent clamping plate (30) is in contact with the outer surface of the push plate (14). A dial plate (28) is fixed to the top of the bent clamping plate (30). One end of the dial plate (28) slidably penetrates into the interior of the movable cavity (13) and is located directly below the adjustment port (7).

8. A torque test device for a power take-off according to claim 7, characterized in that: A side cavity (31) is formed at the top of the adjustment cavity (27). A sliding plate (32) is slidably arranged between the inner walls of the side cavity (31). The bottom of the sliding plate (32) is fixed to the top of the bent clamping plate (30). A return spring (34) is fixed to one side of the sliding plate (32). One end of the return spring (34) is fixed to one side inner wall of the side cavity (31). A bridge connection port (33) penetrating from the top to the bottom is formed on the top of the sliding plate (32).

9. A torque testing device for a power take-off according to claim 8, characterized in that: A flow channel (35) is formed on the inner wall of the transmission box (1) on one side of the adjustment cavity (27). The bottom of the flow channel (35) penetrates to the top of the guiding port (19). The top of the flow channel (35) penetrates to the inner bottom surface of the side cavity (31). An oil cavity (26) is formed inside the top cover (2). An oil inlet (29) is formed on the inner bottom surface of the oil cavity (26). The oil inlet (29) penetrates to the interior of the side cavity (31). A feed pipe (18) penetrating into the interior of the oil cavity (26) is fixedly arranged on the top of the top cover (2). The oil inlet (29) is located directly above the flow channel (35).

10. A torque testing device for a power take-off according to claim 9, characterized in that: The inner top surface of the guiding port (19) is provided with a docking groove (36), the docking groove (36) communicates with the bottom of the flow channel (35), the inner bottom surface of the guiding port (19) is provided with a diversion cavity (40), the inner bottom surface of the diversion cavity (40) is provided with a sewage discharge port (11), one end of the sewage discharge port (11) penetrates to the outside of the transmission box (1), the inner bottom surface of the transmission box (1) is provided with an annular groove (42), the inner bottom surface of the annular groove (42) is provided with a bending hole (41), one end of the bending hole (41) penetrates to the inside of the diversion cavity (40), a bridge connecting pipe (39) is arranged inside the guiding block (38), the bottom of the bridge connecting pipe (39) extends to the inside of the diversion cavity (40), the top of the bridge connecting pipe (39) extends above the guiding block (38) and is located directly below the docking groove (36), a throttling small hole (43) penetrating to the inside of the annular raceway (24) is arranged on one inner wall of the bridge connecting pipe (39), and the bottom of the bridge connecting pipe (39) is in a closed shape.

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