Load transfer type speed reducer testing device

Abstract

This invention discloses a load-transfer type reducer testing device, relating to the field of reducer load detection technology. It includes a power input unit, two positioning platforms, and a testing unit. The testing unit is positioned between the two positioning platforms and includes a testing platform, a differential detection mechanism, and a pair of load adjustment mechanisms. The differential detection mechanism contains a pair of input bevel gears, a differential frame, and a feedback component. The feedback component drives a screw nut sliding rheostat via the differential bevel gears, converting the speed difference between the two reducers into a resistance signal output. The load adjustment mechanism uses an electromagnet and a copper block to generate electromagnetic damping to simulate a load. If there is a difference in efficiency between the two reducers, the differential bevel gears rotate, causing a change in the resistance of the sliding rheostat. The control system then determines the side with lower efficiency. This invention has a compact structure, low energy consumption, and can simultaneously compare and test the load transfer efficiency of two reducers.

Description

Technical Field

[0001] This invention relates to the field of speed reducer load testing technology, specifically a load-transfer type speed reducer testing device. Background Technology

[0002] In the production and R&D of speed reducers, load transmission efficiency is the core indicator for measuring their performance. Traditional speed reducer testing methods are mainly divided into two categories. One is to adopt an open structure of "drive motor - speed reducer under test - load motor" and directly measure the output torque through a series torque sensor. This method requires a high-power load motor with a power equivalent to that of the speed reducer under test. The equipment cost is high and the energy consumption is huge. It can only test one unit at a time and cannot directly compare the efficiency difference between two speed reducers under the same working conditions. Another testing method is to use a back-to-back mechanical closed test bench, connecting the output ends of two reducers to form a power cycle. Although this can reduce drive energy consumption, it requires the use of two identical reducers under test at the same time, which makes installation and alignment difficult, slow in response, and cumbersome in operation.

[0003] To address the aforementioned problems, this invention provides a load-transfer type reducer testing device that uses a differential mechanism to directly convert the speed difference between two reducers into an electrical signal, while simultaneously simulating the load through electromagnetic damping, thereby achieving efficient and low-cost comparative testing. Summary of the Invention

[0004] The purpose of this invention is to provide a load-transfer type reducer testing device to solve the problems raised in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a load-transfer type reducer testing device, comprising a power input unit, two positioning platforms and a testing unit, wherein the power input unit is disposed on one side of the two positioning platforms that are far apart from each other, and the testing unit is disposed between the two positioning platforms. The testing unit includes a testing platform, a differential detection mechanism disposed on the testing platform and a pair of load adjustment mechanisms, wherein the pair of load adjustment mechanisms are symmetrically installed on both sides of the differential detection mechanism. The differential speed testing mechanism includes a testing box, a pair of input bevel gears, a differential frame, and a feedback component. The pair of input bevel gears, differential frame, and feedback component are all installed inside the testing box. The pair of input bevel gears are symmetrically arranged. The differential frame is rotatably mounted on the shaft of the pair of input bevel gears. The feedback component is mounted on the differential frame and is drively connected to the pair of input bevel gears. The shaft of the pair of input bevel gears passes through the testing box, and the pair of input bevel gears are connected to a pair of load adjustment mechanisms. The operator uses a crane to hoist two reducers onto the first positioning platform and the second positioning platform, respectively. The two reducers are positioned by several positioning pins. A clamping assembly fixes the two reducers to the first and second positioning platforms, respectively. Then, the operator connects the coupling sleeve to the input shaft of the reducer. The stepper motor drives the coupling sleeve to rotate through the coupling, which in turn drives the input shaft of the reducer to rotate. The two reducers being tested are of the same model. When the input speeds of the stepper motors on both sides are the same, the output speeds of the two reducer motors under normal operating conditions are also the same.

[0006] Furthermore, the feedback component includes a differential bevel gear and a converter. The differential bevel gear is rotatably connected to the differential frame and meshes between a pair of input bevel gears. The converter is installed on the side of the differential frame away from the differential bevel gear. The rotating shaft connected to the differential bevel gear passes through the differential frame and is connected to the converter. The converter is connected to a control system via a circuit. The two input bevel gears rotate in the same direction. Driven by the two input bevel gears, the differential frame constrains the differential bevel gear to revolve around its axis. If the operating conditions of the two reducers are the same, the differential bevel gear cannot rotate on its own. If the operating conditions of the two reducers differ, resulting in a difference in the speed of the two input bevel gears, the differential bevel gear, although still able to continue revolving around its axis, will rotate on its own axis. This rotation of the differential bevel gear drives the screw to rotate, thereby adjusting the converter.

[0007] Furthermore, the inverter includes a protective housing, a screw, a nut, and a sliding rheostat. The screw is rotatably mounted in the protective housing and connected to the shaft of the differential bevel gear. The nut is slidably mounted in the protective housing and screwed onto the screw. The rheostat cylinder is fixedly mounted inside the protective housing, and the rheostat head is connected to the nut and the rheostat cylinder. In the initial state, the nut is located in the middle of the screw, and the protective housing restricts the rotational freedom of the nut. When the screw rotates, the nut slides along the axial direction of the screw. The direction of movement of the nut depends on the rotational direction of the screw, which in turn depends on the relative operating conditions of the two reducers. As the nut moves, it drives the rheostat head to move on the rheostat cylinder, causing a change in the resistance value of the sliding rheostat. By detecting the current in the sliding rheostat circuit through the control system, the operating status of the differential bevel gear can be determined. Furthermore, the input speed of the two input bevel gears can be used to determine which reducer has a weaker load transmission efficiency.

[0008] Furthermore, each of the load adjustment mechanisms includes a guide rail, a moving module, an adapter frame, and a load-applying wheel. The guide rail is mounted on the test bench, the moving module is slidably mounted on the guide rail, and the moving module is connected to the control system circuit. The adapter frame and electromagnet are mounted on the moving module, and the load-applying wheel is rotatably mounted on the adapter frame. A splined sleeve is coaxially mounted on the side of the load-applying wheel closest to the test box. A splined shaft is connected to the shaft of each input bevel gear, and the splined sleeve is fitted onto the splined shaft. After the two reducers are positioned and clamped, the control system controls the moving module to slide on the guide rail, so that the load-applying sleeve aligns with the output shaft of the reducer, transmitting the output of the reducer's output shaft to the splined sleeve, which then drives the input bevel gear to rotate via the splined shaft.

[0009] Furthermore, the loading wheel has an annular groove in its center, and several copper blocks are evenly distributed in a ring on both sides of the groove. The load adjustment mechanism also includes an electromagnet, which is mounted on the moving module and connected to the control system circuit. The electromagnet is located in the annular groove. When the electromagnet is energized, it generates magnetic force. When the copper blocks pass through the magnetic field lines, an induced current is generated. This induced current generates an induced magnetic field. Due to Lenz's law, the induced magnetic field interacts with the electromagnet's magnetic field lines, producing electromagnetic damping. The loading wheel requires a larger torque to rotate, simulating the output of a speed reducer under load.

[0010] Furthermore, a load-bearing sleeve is coaxially provided on the side of the load-bearing wheel away from the detection box, and the load-bearing sleeve is connected to the output shaft of the reducer.

[0011] Furthermore, the two positioning platforms include a first positioning platform and a second positioning platform. The first positioning platform and the second positioning platform have the same structure. The first positioning platform is provided with several positioning pins, and a clamping assembly is also installed in the first positioning platform.

[0012] Furthermore, the clamping assembly includes at least four flanged clamps, each with a sloping bottom surface. Each flanged clamp is connected to a sprocket via a rigid shaft, which is rotatably connected to the first positioning platform. The at least four sprockets are connected by the same chain, and a servo motor is connected to one of the sprockets, which is mounted in the first positioning platform. The servo motor drives one sprocket to rotate, and the sprocket drives the other sprockets to rotate synchronously via the chain. The flanged clamps rotate around their axes, pressing against the chassis of the reducer through their protruding parts, thus fixing the reducer in place.

[0013] Furthermore, the power input unit includes a stepper motor, a coupling, and a coupling sleeve, wherein the coupling sleeve is connected to the input shaft of the reducer.

[0014] Furthermore, a reset adjustment head is provided at the end of the screw away from the differential bevel gear, and the reset adjustment head penetrates the protective shell. Before each load transfer test on the two reducers, the operator needs to use a hex wrench to rotate the reset adjustment head to reset the nut.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses a differential detection mechanism to achieve real-time comparative testing of two reducers under the same operating conditions. When there is a difference in the output speed of the two reducers, the differential bevel gear rotates, which drives the sliding rheostat to generate a change in resistance through the screw and nut mechanism. The control system can directly determine the side with lower efficiency. The whole process does not require additional torque sensors or complex calculations. The detection is intuitive and the response is fast. It is especially suitable for consistency screening of reducers in the same batch.

[0016] 2. The load adjustment mechanism uses the electromagnetic damping effect between the electromagnet and the copper block to simulate the load. It does not require a traditional high-power load motor or brake. The electromagnetic damping is a non-contact loading method, and the damping torque can be continuously adjusted by adjusting the electromagnet current. This reduces the manufacturing cost and operating energy consumption of the test equipment, and the structure is more compact. 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 flange clamp of the present invention; Figure 3 This is a schematic diagram of the internal structure of the first positioning stage of the present invention; Figure 4 This is a schematic diagram of the test bench of the present invention; Figure 5 This is a schematic diagram of the internal structure of the detection box of the present invention; Figure 6This is a schematic diagram of the internal structure of the inverter of the present invention.

[0018] In the diagram: 1. Test bench; 2. First positioning table; 3. Second positioning table; 4. Servo motor; 5. Sprocket; 6. Chain; 7. Flange clamp; 8. Rigid shaft; 9. Positioning pin; 10. Reducer; 11. Coupling sleeve; 12. Guide rail; 13. Moving module; 14. Adapter frame; 15. Loading wheel; 16. Electromagnet; 17. Copper block; 18. Spline sleeve; 19. Loading sleeve; 20. Detection box; 21. Spline shaft; 22. Input bevel gear; 23. Differential frame; 24. Differential bevel gear; 25. Screw; 26. Nut; 27. Variable resistance head; 28. Variable resistance cylinder; 29. ​​Reset adjustment head; 30. Inverter. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example: Figures 1-6 As shown, the present invention provides a technical solution, a load-transfer type reducer testing device, including a power input unit, two positioning platforms and a testing unit. The power input unit is located on one side of the two positioning platforms that are far apart from each other. The testing unit is located between the two positioning platforms. The testing unit includes a testing platform 1, a differential detection mechanism set on the testing platform 1 and a pair of load adjustment mechanisms. The pair of load adjustment mechanisms are symmetrically installed on both sides of the differential detection mechanism.

[0021] The two positioning platforms include a first positioning platform 2 and a second positioning platform 3. The first positioning platform 2 and the second positioning platform 3 have the same structure. The first positioning platform 2 is provided with several positioning pins 9. The first positioning platform 2 is also equipped with a clamping assembly, which includes at least four flange clamps 7. Each flange clamp 7 has a sloping bottom surface. Each flange clamp 7 is connected to a sprocket 5 via a rigid shaft 8. The rigid shaft 8 is rotatably connected to the first positioning platform 2. At least four sprockets 5 are connected by the same chain 6. A servo motor 4 is connected to one sprocket 5. The servo motor 4 is installed in the first positioning platform 2. The operator uses a crane to hoist two reducers 10 onto the first positioning platform 2 and the second positioning platform 3 respectively. The chassis of the reducer 10 is initially positioned using locating pins 9. Then, the control system starts the servo motor 4, which drives the connected sprocket 5 to rotate. This sprocket 5, via a chain 6, drives at least three other sprockets 5 to rotate synchronously. Each sprocket rotates around its own shaft 8, causing the flange clamp 7 to rotate. The protruding parts of the flange clamp 7 gradually press against the edge of the reducer 10's chassis, thus firmly fixing the two reducers 10 onto the first positioning platform 2 and the second positioning platform 3, respectively. The operator connects the coupling sleeve 11 of the power input unit to the input shaft of the reducer 10. The stepper motor drives the coupling sleeve 11 to rotate via the coupling, thereby driving the input shaft of the reducer 10 to rotate. The two reducers 10 used in the test are identical in model and speed ratio. Under the ideal condition that the input speeds of the stepper motors on both sides are the same, the output speeds of the two reducers 10 should also be the same.

[0022] Each load adjustment mechanism includes a guide rail 12, a moving module 13, a transfer frame 14, and a load-applying wheel 15. The guide rail 12 is mounted on the test bench 1. The moving module 13 is slidably mounted on the guide rail 12 and is connected to the control system circuit. The transfer frame 14 and an electromagnet 16 are mounted on the moving module 13. The load-applying wheel 15 is rotatably mounted on the transfer frame 14. A splined sleeve 18 is coaxially mounted on the side of the load-applying wheel 15 near the test box 20. A shaft of each input bevel gear 22 is connected to... There is a splined shaft 21, and a splined sleeve 18 is sleeved and connected to the splined shaft 21. The loading wheel 15 has an annular groove in the middle. Several copper blocks 17 are evenly installed in a ring on both sides of the annular groove. The load adjustment mechanism also includes an electromagnet 16, which is set on the moving module 13 and connected to the control system circuit. The electromagnet 16 is located in the annular groove. A load-binding sleeve 19 is coaxially arranged on the side of the loading wheel 15 away from the detection box 20. The load-binding sleeve 19 is connected to the output shaft of the reducer 10.

[0023] After the reducer 10 is positioned and fixed, the control system controls the moving module 13 to slide on the guide rail 12. The spline sleeve 18 on one side of the loading wheel 15 and the spline shaft 21 realize torque transmission. At the same time, the coupling sleeve 19 coaxially set on the other side of the loading wheel 15 is connected to the output shaft of the reducer 10, thereby transmitting the output torque of the reducer 10 to the loading wheel 15, which then drives the input bevel gear 22 to rotate.

[0024] To simulate the load on the reducer 10 under actual working conditions, the electromagnet 16 mounted on the moving module 13 is located in the annular groove but does not directly contact the copper block 17. The control system energizes the electromagnet 16 to generate a magnetic field. When the reducer 10 drives the load wheel 15 to rotate, the copper block 17 cuts the magnetic field lines of the electromagnet 16. According to Faraday's law of electromagnetic induction, an induced current is generated inside the copper block 17, which in turn generates an induced magnetic field. According to Lenz's law, the electromagnet 16 generates an electromagnetic damping force on the load wheel 15 in the opposite direction of rotation, which is equivalent to simulating the load borne by the output end of the reducer 10. By adjusting the current of the electromagnet 16, the damping torque can be continuously changed, thereby simulating different load conditions.

[0025] The differential detection mechanism includes a detection box 20, a pair of input bevel gears 22, a differential frame 23, and a feedback component. The pair of input bevel gears 22, the differential frame 23, and the feedback component are all installed inside the detection box 20. The pair of input bevel gears 22 are symmetrically arranged. The differential frame 23 is rotatably mounted on the shaft of the pair of input bevel gears 22. The feedback component is mounted on the differential frame 23 and is connected to the pair of input bevel gears 22 in a transmission connection. The shaft of the pair of input bevel gears 22 passes through the detection box 20. The pair of input bevel gears 22 are connected to a pair of load adjustment mechanisms. The power input unit includes a stepper motor, a coupling, and a coupling sleeve 11. The coupling sleeve 11 is connected to the input shaft of the reducer 10. Two load adjustment mechanisms are connected to the output shafts of the two reducers 10 respectively, and each drives an input bevel gear 22 to rotate. The speed of the differential frame 23 is the common speed of the two input bevel gear 22 shafts. When the operating conditions of the two reducers 10 are completely consistent, the rotation speed of the differential bevel gear 24 is zero, and it only revolves around the axis of the input bevel gear 22 together with the differential frame 23. When there is a difference in the transmission efficiency or output characteristics of the two reducers 10, their output shaft speeds are inconsistent. At this time, the differential bevel gear 24 will also rotate, and the direction of rotation is determined by the speed difference.

[0026] The feedback assembly includes a differential bevel gear 24 and an inverter 30. The differential bevel gear 24 is rotatably connected to the differential frame 23 and meshes between a pair of input bevel gears 22. The inverter 30 is installed on the side of the differential frame 23 away from the differential bevel gear 24. The shaft connected to the differential bevel gear 24 passes through the differential frame 23 and is connected to the inverter 30. The inverter 30 is connected to a control system via a circuit. The inverter 30 includes a protective housing, a screw 25, a nut 26, and a sliding rheostat. The screw 25 is rotatably installed in the protective housing and is connected to the shaft of the differential bevel gear 24. The nut 26 is slidably installed in the protective housing and is screwed onto the screw 25. The rheostat cylinder 28 is fixedly installed inside the protective housing. The rheostat head 27 is connected to the nut 26 and the rheostat cylinder 28. When the differential bevel gear 24 rotates, the screw 25 rotates accordingly, and the nut 26 moves along the axial direction of the screw 25. When the nut 26 moves, it drives the variable resistor head 27 to slide on the variable resistor cylinder 28, thereby changing the resistance value of the sliding rheostat connected to the circuit. The change in resistance value corresponds one-to-one with the direction and distance of the movement of the nut 26. The direction of movement of the nut 26 depends on the direction of rotation of the differential bevel gear 24, ultimately reflecting which side of the reducer 10 has lower efficiency. The control system monitors the current or voltage signal in the sliding rheostat circuit in real time. If the resistance value remains unchanged, it indicates that the load transmission efficiency of the two reducers 10 is consistent. If the resistance value changes monotonically in a certain direction, it can be determined that the reducer 10 on the corresponding side has a problem of low efficiency. By pre-calibrating the ratio coefficient between the resistance change rate and the speed difference, the efficiency difference of the reducer 10 is quantified.

[0027] A reset adjustment head 29 is provided at the end of the screw 25 away from the differential bevel gear 24, and the reset adjustment head 29 penetrates the protective shell. Before each dual-machine comparison test, a hex wrench is used to rotate the reset adjustment head 29. The reset adjustment head 29 is connected to the end of the screw 25. Rotating it will force the nut 26 to move to the initial position in the middle of the screw 25, so that the sliding rheostat returns to zero position, ensuring the accuracy of the next test.

[0028] The working principle of this invention is as follows: The operator uses a crane to hoist two reducers 10 onto the first positioning platform 2 and the second positioning platform 3 respectively. The chassis of the reducer 10 is initially positioned by positioning pins 9. Then, the control system starts the servo motor 4, which drives the connected sprocket 5 to rotate. This sprocket 5 drives at least three other sprockets 5 to rotate synchronously via a chain 6. Each sprocket rotates around its own rigid shaft 8 and a driving flange clamp 7, with its protruding part gradually pressing against the edge of the reducer 10's chassis, thus firmly fixing the two reducers 10 onto the first positioning platform 2 and the second positioning platform 3 respectively. The operator connects the coupling sleeve 11 of the power input unit to the input shaft of the reducer 10. The stepper motor drives the coupling sleeve 11 to rotate via the coupling, thereby driving the input shaft of the reducer 10 to rotate. The two reducers 10 used in the test are identical in model and speed ratio. Under the ideal condition that the input speeds of the stepper motors on both sides are the same, the output speeds of the two reducers 10 should also be the same.

[0029] After the reducer 10 is positioned and fixed, the control system controls the moving module 13 to slide on the guide rail 12. The spline sleeve 18 on one side of the loading wheel 15 and the spline shaft 21 realize torque transmission. At the same time, the coupling sleeve 19 coaxially set on the other side of the loading wheel 15 is connected to the output shaft of the reducer 10, thereby transmitting the output torque of the reducer 10 to the loading wheel 15, which then drives the input bevel gear 22 to rotate.

[0030] To simulate the load on the reducer 10 under actual working conditions, the electromagnet 16 mounted on the moving module 13 is located in the annular groove but does not directly contact the copper block 17. The control system energizes the electromagnet 16 to generate a magnetic field. When the reducer 10 drives the load wheel 15 to rotate, the copper block 17 cuts the magnetic field lines of the electromagnet 16. According to Faraday's law of electromagnetic induction, an induced current is generated inside the copper block 17, which in turn generates an induced magnetic field. According to Lenz's law, the electromagnet 16 generates an electromagnetic damping force on the load wheel 15 in the opposite direction of rotation, which is equivalent to simulating the load borne by the output end of the reducer 10. By adjusting the current of the electromagnet 16, the damping torque can be continuously changed, thereby simulating different load conditions.

[0031] Two load adjustment mechanisms are connected to the output shafts of the two reducers 10 respectively, and each drives an input bevel gear 22 to rotate. The speed of the differential frame 23 is the common speed of the two input bevel gear 22 shafts. When the operating conditions of the two reducers 10 are completely consistent, the rotation speed of the differential bevel gear 24 is zero, and it only revolves around the axis of the input bevel gear 22 together with the differential frame 23. When there is a difference in the transmission efficiency or output characteristics of the two reducers 10, their output shaft speeds are inconsistent. At this time, the differential bevel gear 24 will also rotate, and the direction of rotation is determined by the speed difference.

[0032] When the differential bevel gear 24 rotates, the screw 25 rotates accordingly, and the nut 26 moves along the axial direction of the screw 25. When the nut 26 moves, it drives the variable resistor head 27 to slide on the variable resistor cylinder 28, thereby changing the resistance value of the sliding rheostat connected to the circuit. The change in resistance value corresponds one-to-one with the direction and distance of the movement of the nut 26. The direction of movement of the nut 26 depends on the direction of rotation of the differential bevel gear 24, ultimately reflecting which side of the reducer 10 has lower efficiency. The control system monitors the current or voltage signal in the sliding rheostat circuit in real time. If the resistance value remains unchanged, it indicates that the load transmission efficiency of the two reducers 10 is consistent. If the resistance value changes monotonically in a certain direction, it can be determined that the reducer 10 on the corresponding side has a problem of low efficiency. By pre-calibrating the ratio coefficient between the resistance change rate and the speed difference, the efficiency difference of the reducer 10 is quantified.

[0033] Before each dual-machine comparison test, a hex wrench is needed to rotate the reset adjustment head 29. The reset adjustment head 29 is connected to the end of the screw 25. Rotating it will force the nut 26 to move to the initial position in the middle of the screw 25, so that the sliding rheostat returns to zero and ensures the accuracy of the next test.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A load-transfer type reducer testing device, characterized in that: It includes a power input unit, two positioning platforms and a test unit. The power input unit is located on one side of the two positioning platforms that are far apart from each other. The test unit is located between the two positioning platforms. The test unit includes a test platform (1), a differential detection mechanism set on the test platform (1) and a pair of load adjustment mechanisms. The pair of load adjustment mechanisms are symmetrically installed on both sides of the differential detection mechanism. The differential detection mechanism includes a detection box (20), a pair of input bevel gears (22), a differential frame (23), and a feedback component. The pair of input bevel gears (22), the differential frame (23), and the feedback component are all installed inside the detection box (20). The pair of input bevel gears (22) are symmetrically arranged. The differential frame (23) is rotatably mounted on the shaft of the pair of input bevel gears (22). The feedback component is mounted on the differential frame (23) and is connected to the pair of input bevel gears (22) in a transmission connection. The shaft of the pair of input bevel gears (22) passes through the detection box (20). The pair of input bevel gears (22) are connected to a pair of load adjustment mechanisms. The feedback component includes a differential bevel gear (24) and an inverter (30). The differential bevel gear (24) is rotatably connected to the differential frame (23). The differential bevel gear (24) is meshed between a pair of input bevel gears (22). The inverter (30) is installed on the side of the differential frame (23) away from the differential bevel gear (24). The rotating shaft connected to the differential bevel gear (24) passes through the differential frame (23) and is connected to the inverter (30). The inverter (30) is connected to a control system via a circuit. The inverter (30) includes a protective shell, a screw (25), a nut (26), and a sliding rheostat. The screw (25) is rotatably installed in the protective shell and is connected to the shaft of the differential bevel gear (24). The nut (26) is slidably installed in the protective shell and is screwed onto the screw (25). The rheostat cylinder (28) is fixedly installed in the protective shell. The rheostat head (27) is connected to the nut (26) and the rheostat head (27) is connected to the rheostat cylinder (28).

2. The load-transfer type reducer testing device according to claim 1, characterized in that: Each load adjustment mechanism includes a guide rail (12), a moving module (13), a transfer frame (14), and a load wheel (15). The guide rail (12) is set on the test bench (1). The moving module (13) is slidably set on the guide rail (12). The moving module (13) is connected to the control system circuit. The transfer frame (14) and the electromagnet (16) are mounted on the moving module (13). The load wheel (15) is rotatably mounted on the transfer frame (14). A spline sleeve (18) is coaxially set on the side of the load wheel (15) near the test box (20). A spline shaft (21) is connected to the shaft of each input bevel gear (22). The spline sleeve (18) is sleeved and connected to the spline shaft (21).

3. The load-transfer type reducer testing device according to claim 2, characterized in that: The loading wheel (15) has an annular groove in the middle. Several copper blocks (17) are evenly distributed in a ring on both sides of the annular groove. The load adjustment mechanism also includes an electromagnet (16). The electromagnet (16) is set on the moving module (13). The electromagnet (16) is connected to the control system circuit and is located in the annular groove.

4. The load-transfer type reducer testing device according to claim 2, characterized in that: A load-bearing sleeve (19) is coaxially arranged on the side of the load-bearing wheel (15) away from the detection box (20), and the load-bearing sleeve (19) is connected to the output shaft of the reducer (10).

5. The load-transfer type reducer testing device according to claim 1, characterized in that: The two positioning platforms include a first positioning platform (2) and a second positioning platform (3). The first positioning platform (2) and the second positioning platform (3) have the same structure. Several positioning pins (9) are provided on the first positioning platform (2). A clamping component is also installed in the first positioning platform (2).

6. The load-transfer type reducer testing device according to claim 5, characterized in that: The clamping assembly includes at least four flange clamps (7), each flange clamp (7) has a bottom slope, each flange clamp (7) is connected to a sprocket (5) via a rigid shaft (8), the rigid shaft (8) is rotatably connected to the first positioning table (2), at least four sprockets (5) are connected to the same chain (6), and a servo motor (4) is connected to one of the sprockets (5), the servo motor (4) is installed in the first positioning table (2).

7. The load-transfer type reducer testing device according to claim 1, characterized in that: The power input unit includes a stepper motor, a coupling and a coupling sleeve (11), and the coupling sleeve (11) is connected to the input shaft of the reducer (10).

8. The load-transfer type reducer testing device according to claim 1, characterized in that: A reset adjustment head (29) is provided at the end of the screw (25) away from the differential bevel gear (24), and the reset adjustment head (29) penetrates the protective shell.

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