Large-torque horizontal screw centrifuge differential mechanism back-to-back test bench

Abstract

The invention discloses a back-to-back test bench for a differential mechanism of a large-torque horizontal screw centrifuge, belongs to the technical field of back-to-back power closed transmission test benches, and aims to solve the problems that an existing differential mechanism test bench cannot apply large torque and is difficult to meet the test requirements of the differential mechanism of the large-torque horizontal screw centrifuge. The device comprises a power unit, a speed-up transmission unit, a speed-down transmission unit, a differential mechanism loading unit, a loading unit and an end positioning unit, the two sides of the differential mechanism loading unit are each provided with a differential mechanism, and the two differential mechanisms are oppositely arranged; the power unit outputs power rotating speed which is transmitted to the differential mechanisms on the two sides of the differential mechanism loading unit through the speed increasing transmission unit and the speed reducing transmission unit in sequence so that performance testing can be conducted on the two differential mechanisms arranged back to back. On the basis, a loading load is applied to the differential mechanism through the loading unit so as to realize an on-load test and a reliability test on the differential mechanism.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of back-to-back power closed transfer test bench, and particularly relates to a large-torque horizontal screw centrifuge differential back-to-back test bench. BACKGROUND

[0002] The centrifuge differential is a core transmission component of the horizontal screw centrifuge, and its performance directly determines the separation efficiency, running stability and service life of the equipment, and is widely used in many key fields of the national economy such as petroleum chemical industry, light industry, pharmaceutical industry, food industry and environmental protection. The differential of this type generally adopts involute planetary gear transmission mode, and becomes the preferred configuration of various centrifuges due to the advantages of compact structure, light weight, and precise differential transmission;

[0003] At present, a mature research and development, production and test system has been formed in the field of small and medium torque centrifuge differential in China, and the product performance is stable, which can fully meet the application requirements of small and medium-sized equipment. However, with the intensification of industrial production scale and large-scale trend, the demand for large-scale horizontal screw centrifuges with larger processing capacity and higher running load is increasing in the fields of environmental protection, oil exploitation and biological medicine. The market of large-torque centrifuge differential which is matched with the large-scale horizontal screw centrifuge has been monopolized by foreign brands for a long time, and has not been replaced by domestic products.

[0004] The localization process of large-torque differential is hindered, one of the core bottlenecks is the lack of high-performance test verification equipment, and the existing test bench is mainly designed for small and medium torque differential, which cannot simulate the complex stress state under large torque working condition, and the traditional test method has the problems of large power loss, low test precision, and cannot realize closed loop load test, which cannot meet the strict requirements of large-torque differential in performance calibration, load condition simulation and long-term reliability verification;

[0005] Therefore, the research and development of a back-to-back power closed test bench suitable for large-torque horizontal screw centrifuge differential can not only fill the gap of test equipment in this field, provide key test support for the localization research and development of large-torque differential, but also effectively reduce the dependence on imported products of domestic enterprises, improve the self-innovation level of large-scale centrifuge core components in China, and has important economic value and industry significance. SUMMARY

[0006] In order to solve the problem that the existing differential test bench cannot apply large torque and cannot meet the test requirements of large-torque centrifuge differential, a large-torque horizontal screw centrifuge differential back-to-back test bench is provided.

[0007] A large-torque horizontal screw centrifuge differential back-to-back test bench, the test bench comprises a power unit, a speed increasing transmission unit, a speed reducing transmission unit, a differential loading unit and an end positioning unit.

[0008] The power unit, speed-increasing transmission unit, speed-reducing transmission unit, differential loading unit, and end positioning unit are sequentially arranged and installed on the slide rails on the test floor. A differential is installed on each side of the differential loading unit, and the two differentials are set back to back. The power output end of the power unit is connected to the power input end of the speed-increasing transmission unit, the power output end of the speed-increasing transmission unit is connected to the power input end of the speed-reducing transmission unit, the power output end of the speed-reducing transmission unit is connected to the differential on one side of the differential loading unit, and the differential on the other side of the differential loading unit is connected to the end positioning unit. The power output speed of the power unit is sequentially transmitted to the differentials on both sides of the differential loading unit through the speed-increasing transmission unit and the speed-reducing transmission unit for performance testing, load testing, and reliability testing of the two back-to-back differentials.

[0009] Furthermore, the power unit includes a motor and a motor bracket. The motor is mounted on a slide rail on the floor of the laboratory via the motor bracket, and the power output shaft of the motor is oriented toward the speed-increasing transmission unit. The power output shaft of the motor is connected to the power input end of the speed-increasing transmission unit via an output shaft coupling.

[0010] Furthermore, the speed-increasing transmission unit includes a speed-increasing gearbox bracket and a speed-increasing gearbox. The speed-increasing gearbox is mounted on the slide rail on the laboratory floor via the speed-increasing gearbox bracket. The power input end of the speed-increasing gearbox is connected to the power output shaft of the motor via an output shaft coupling. The power output end of the speed-increasing gearbox is connected to the power input end of the speed-reducing transmission unit via a diaphragm coupling.

[0011] Furthermore, the speed-increasing gearbox includes a speed-increasing gearbox body, a power input shaft system, a speed-increasing shaft system, and a power output shaft system. The power input shaft system, the speed-increasing shaft system, and the power output shaft system are all installed in the speed-increasing gearbox body. The power input shaft system is connected to the power output shaft of the motor through an output shaft coupling. The power input shaft system is connected to the power output shaft system through the speed-increasing shaft system. The power output shaft system is connected to the power input end of the speed reduction transmission unit through a diaphragm coupling.

[0012] Furthermore, the reduction transmission unit includes a reduction gearbox and a transmission gearbox bracket. The transmission gearbox is mounted on the slide rail on the floor of the laboratory via the transmission gearbox bracket. The power input end of the reduction gearbox is connected to the power output end of the speed-increasing gearbox via a diaphragm coupling. The power output end of the reduction gearbox is connected to the power input end of the corresponding differential via a No. 1 coupling.

[0013] Furthermore, the reduction gearbox includes a reduction gearbox body, a high-speed input shaft system, and a low-speed output shaft system. Both the high-speed input shaft system and the low-speed output shaft system are installed in the reduction gearbox body. The diaphragm coupling of the high-speed input shaft system is connected to the power output end of the speed-increasing gearbox. The high-speed input shaft system is connected to the low-speed output shaft system via a drive connection. The low-speed output shaft system is connected to the power input end of the corresponding differential via a No. 1 coupling.

[0014] Furthermore, the test bench also includes a loading unit, which is located on one side of the reduction gear unit. The loading unit is used to increase the load on the differential located near the reduction gear unit.

[0015] Furthermore, the loading unit includes a two-stage worm gear reducer, a reducer bracket, a servo motor, and a torque shaft. The two-stage worm gear reducer is mounted on the slide rail on the laboratory floor via the reducer bracket. The power input end of the two-stage worm gear reducer is connected to the power output end of the servo motor. The housing of the servo motor is fixedly connected to the housing of the two-stage worm gear reducer. The power output end of the two-stage worm gear reducer is connected to one end of the torque shaft. The other end of the torque shaft is connected to the differential near the reduction transmission unit via a second coupling.

[0016] Furthermore, the differential loading unit includes a differential support assembly and a support bracket, with the differential support assembly mounted on a slide rail on the test chamber floor via the support bracket;

[0017] The differential support assembly includes a bearing housing and a drive shaft. The bearing housing is mounted on a slide rail on the floor of the test chamber via a support bracket. The drive shaft is inserted into the bearing housing and rotatably connected to the bearing housing via a bearing. Both ends of the drive shaft extend outside the bearing housing, and a differential is inserted into each end of the drive shaft.

[0018] Furthermore, the end positioning unit includes an end bracket and an end limiting seat. The end limiting seat is mounted on the slide rail on the laboratory floor via the end bracket. An end limiting shaft is inserted into the end limiting seat. The end limiting shaft is connected to the corresponding differential via a No. 1 coupling.

[0019] The beneficial effects of this application compared to the prior art are:

[0020] 1. This application provides a back-to-back test bench for the differential of a high-torque horizontal screw centrifuge. Addressing the shortcomings of existing test benches that are only suitable for small and medium torque differentials and cannot simulate high-torque operating conditions, this test bench, through precise transmission unit design and load control, achieves performance calibration, load condition simulation, and long-term reliability verification of high-torque differentials. It fills the technological gap in domestic high-torque differential testing equipment, provides key testing support for its domestic development, breaks the monopoly of foreign brands, and overcomes the bottleneck of domestic production.

[0021] 2. The back-to-back test bench for the differential of a high-torque horizontal screw centrifuge provided in this application adopts a back-to-back power closed structure, which greatly reduces the power loss of traditional test methods and improves energy utilization efficiency; with a loading unit composed of a two-stage worm gear reducer, it can accurately apply loads and realize closed-loop load testing, significantly improving test accuracy and data reliability; at the same time, it simplifies the test process, reduces the test costs and time investment in the enterprise's R&D stage, and lowers the test cost.

[0022] 3. The back-to-back test bench for differential gears of high-torque horizontal screw centrifuges provided in this application provides a reliable performance verification method for the research and development and production of differential gears for high-torque horizontal screw centrifuges in China, effectively reducing the dependence of domestic enterprises on imported products and promoting the improvement of the self-sufficiency level of core components of large centrifuges in my country; its application can cover multiple key fields such as petrochemicals, environmental protection, and biomedicine, and is of great significance for promoting the technological upgrading of related industries and enhancing industrial competitiveness.

[0023] 4. The back-to-back test bench for high-torque horizontal screw centrifuge differentials provided in this application adopts a modular design with clear modular layout of each unit, convenient installation and disassembly, and can flexibly adapt to the testing needs of high-torque differentials of different specifications; the transmission system is equipped with a multi-stage gearbox and a high-precision coupling to ensure stable power transmission and accurate force simulation, taking into account both the safety of the test process and the stability of long-term operation, and is suitable for industrial-scale testing scenarios. Attached Figure Description

[0024] Figure 1 This is a front view schematic diagram of the test bench described in this invention;

[0025] Figure 2 This is a top view of the test bench described in this invention;

[0026] Figure 3 This is a schematic diagram of the internal structure of the speed-increasing gearbox in the test bench described in this invention;

[0027] Figure 4 This is a schematic diagram of the internal structure of the reduction gearbox in the test bench described in this invention;

[0028] Figure 5 This is a schematic diagram of the differential loading unit in the test bench described in this invention;

[0029] Figure 6 This is a schematic diagram of the composition of the loading unit in the test bench of the present invention;

[0030] The diagram shows: 1. Laboratory floor slide rail; 2. Motor; 3. Motor bracket; 4. Output shaft coupling; 5. Speed-increasing gearbox; 51. Speed-increasing gearbox housing; 52. Power input shaft system; 53. Speed-increasing shaft system; 54. Power output shaft system; 6. Speed-increasing gearbox bracket; 7. Diaphragm coupling; 8. Reduction gearbox; 81. Reduction gearbox housing; 82. High-speed input shaft system; 83. Low-speed output shaft system; 9. Transmission gearbox bracket; 10. No. 1 coupling; 11. Differential support assembly; 111. Bearing housing; 112. Transmission shaft; 113. Bearing; 12. Support bracket; 13. Differential; 14. End limit seat; 15. End bracket; 16. Two-stage worm gear reducer; 17. Reducer bracket; 18. Servo motor; 19. Torque shaft; and 20. No. 2 coupling. Detailed Implementation

[0031] Specific implementation method one: Combining Figures 1 to 6 This embodiment describes a back-to-back test bench for the differential of a high-torque horizontal screw centrifuge. The test bench includes a power unit, a speed-increasing transmission unit, a speed-reducing transmission unit, a differential loading unit, and an end positioning unit.

[0032] The power unit, speed-increasing transmission unit, speed-reducing transmission unit, differential loading unit, and end positioning unit are sequentially arranged and installed on the test chamber floor slide rail 1. A differential 13 is installed on each side of the differential loading unit, and the two differentials 13 are set back to back. The power output end of the power unit is connected to the power input end of the speed-increasing transmission unit, the power output end of the speed-increasing transmission unit is connected to the power input end of the speed-reducing transmission unit, the power output end of the speed-reducing transmission unit is connected to the differential 13 on one side of the differential loading unit, and the differential 13 on the other side of the differential loading unit is connected to the end positioning unit. The power output speed of the power unit is sequentially transmitted through the speed-increasing transmission unit and the speed-reducing transmission unit to the differentials 13 on both sides of the differential loading unit for performance testing, load testing, and reliability testing of the two back-to-back differentials.

[0033] The power unit includes a motor 2 and a motor bracket 3. The motor 2 is mounted on the slide rail 1 on the floor of the laboratory via the motor bracket 3, and the power output shaft of the motor 2 is oriented toward the speed-increasing transmission unit. The power output shaft of the motor 2 is connected to the power input end of the speed-increasing transmission unit via the output shaft coupling 4.

[0034] The speed-increasing transmission unit includes a speed-increasing gearbox bracket 6 and a speed-increasing gearbox 5. The speed-increasing gearbox 5 is mounted on the laboratory floor slide rail 1 via the speed-increasing gearbox bracket 6. The power input end of the speed-increasing gearbox 5 is connected to the power output shaft of the motor 2 via the output shaft coupling 4. The power output end of the speed-increasing gearbox 5 is connected to the power input end of the speed-reducing transmission unit via the diaphragm coupling 7.

[0035] The speed-increasing gearbox 5 includes a speed-increasing gearbox body 51, a power input shaft system 52, a speed-increasing shaft system 53, and a power output shaft system 54. The power input shaft system 52, the speed-increasing shaft system 53, and the power output shaft system 54 are all installed in the speed-increasing gearbox body 51. The power input shaft system 52 is connected to the power output shaft of the motor 2 through the output shaft coupling 4. The power input shaft system 52 is connected to the power output shaft system 54 through the speed-increasing shaft system 53. The power output shaft system 54 is connected to the power input end of the reduction transmission unit through the diaphragm coupling 7.

[0036] The power input shaft system 52 includes a power input shaft and a first large gear. The power input shaft is inserted into the speed-increasing gearbox 51 and is rotatably connected to the speed-increasing gearbox 51. One end of the power input shaft extends to the outside of the speed-increasing gearbox 51 and is connected to the power output shaft of the motor 2 through the output shaft coupling 4. The first large gear is mounted on the other end of the power input shaft.

[0037] The speed-increasing shaft system 53 includes a speed-increasing shaft, a first small gear, and a second large gear. The speed-increasing shaft is located on one side of the power input shaft and is parallel to the power input shaft 52. Both ends of the speed-increasing shaft 53 extend into the speed-increasing gearbox 51 and are rotatably connected to the speed-increasing gearbox 51. The first small gear and the second large gear are both mounted on the speed-increasing shaft 53.

[0038] The power output shaft system 54 includes a power output shaft and a second pinion. The power output shaft is inserted into the speed-increasing gearbox 51 and is rotatably connected to the speed-increasing gearbox 51. One end of the power output shaft extends to the outside of the speed-increasing gearbox 51 and is connected to the power input end of the reduction transmission unit through a diaphragm coupling 7. The second pinion is mounted on the other end of the power output shaft.

[0039] The first large gear in the power input shaft system 52 is meshed with the first small gear in the speed-increasing shaft system 53, and the second large gear in the speed-increasing shaft system 53 is meshed with the second small gear in the power output shaft system 54.

[0040] The reduction transmission unit includes a reduction gearbox 8 and a transmission gearbox bracket 9. The transmission gearbox 8 is mounted on the slide rail 1 on the laboratory floor via the transmission gearbox bracket 9. The power input end of the reduction gearbox 8 is connected to the power output end of the speed-increasing gearbox 5 via a diaphragm coupling 7. The power output end of the reduction gearbox 8 is connected to the power input end of the corresponding differential 13 via a first coupling 10.

[0041] The reduction gearbox 8 includes a reduction gearbox body 81, a high-speed input shaft system 82, and a low-speed output shaft system 83. Both the high-speed input shaft system 82 and the low-speed output shaft system 83 are installed in the reduction gearbox body 81. The diaphragm coupling 7 of the high-speed input shaft system 82 is connected to the power output end of the speed-increasing gearbox 5. The high-speed input shaft system 82 is connected to the low-speed output shaft system 83 through a transmission connection. The low-speed output shaft system 83 is connected to the power input end of the corresponding differential 13 through a first coupling 10.

[0042] The high-speed input shaft system 82 includes a high-speed shaft, which is arranged in the reduction gearbox 81. Both ends of the high-speed shaft extend to the side wall of the reduction gearbox 81 and are rotatably connected to the reduction gearbox 81. Two No. 3 pinions are mounted on the high-speed shaft.

[0043] The low-speed output shaft system 83 includes a low-speed shaft, which is also arranged in the reduction gearbox 81. Both ends of the low-speed shaft extend to the side wall of the reduction gearbox 81 and are rotatably connected to the reduction gearbox 81. It is worth noting that the low-speed shaft is arranged parallel to the high-speed shaft. Two No. 3 large gears are mounted on the low-speed shaft, and each No. 3 large gear is meshed with a No. 3 small gear.

[0044] The differential loading unit includes a differential support assembly 11 and a support bracket 12. The differential support assembly 11 is mounted on the test chamber floor slide rail 1 via the support bracket 12.

[0045] The differential support assembly 11 includes a bearing housing 111 and a drive shaft 112. The bearing housing 4 is mounted on the slide rail 1 on the floor of the test chamber via a support bracket 12. The drive shaft 112 is inserted into the bearing housing 111 and rotatably connected to the bearing housing 4 via a bearing 113. Both ends of the drive shaft 112 extend outside the bearing housing 4, and a differential 13 is inserted into each end of the drive shaft 112.

[0046] The end positioning unit includes an end bracket 15 and an end limiting seat 14. The end limiting seat 14 is mounted on the laboratory floor slide rail 1 via the end bracket 15. An end limiting shaft is inserted into the end limiting seat 14. The end limiting shaft is connected to the corresponding differential 13 via a No. 3 coupling.

[0047] The back-to-back test bench for the differential of a high-torque horizontal screw centrifuge provided in this embodiment adopts a modular design. In order to ensure the accuracy of the test bench, each module is equipped with a support structure. The core components of this application, including the motor 2, the speed-increasing gearbox 5, the speed-reducing gearbox 8, the differential support assembly 11, and the end limit seat 14, are all supported by the corresponding support structures of each component. These support structures can ensure that the center line height of the components is consistent during operation, so that the speed and torque output from the motor 2 can be stably transmitted to the differential 13 under test, so as to achieve the purpose of performance testing of the differential. In this application, a speed-increasing transmission unit and a speed-reducing transmission unit are also added to the test bench. By converting the output speed and torque through the two, the test environment can be closer to the actual working environment of the differential 13, so as to improve the reliability of the test results.

[0048] In this application, the differential loading unit and the two differentials 13 together form a power closed combination structure. The coupling connected to the power closed combination structure in this test bench is a coupling with a protection device, which protects the power closed combination unit when the running torque exceeds the design torque.

[0049] Specific Implementation Method Two: Combining Figures 1 to 6 This embodiment differs from Specific Embodiment 1 in that the test bench also includes a loading unit, which is located on one side of the reduction gear unit. The loading unit is used to increase the load on the differential 13 located near the reduction gear unit.

[0050] The loading unit includes a two-stage worm gear reducer 16, a reducer bracket 17, a servo motor 18, and a torque shaft 19. The two-stage worm gear reducer 16 is mounted on the laboratory floor slide rail 1 via the reducer bracket 17. The power input end of the two-stage worm gear reducer 16 is connected to the power output end of the servo motor 18. The housing of the servo motor 18 is fixedly connected to the housing of the two-stage worm gear reducer 16. The power output end of the two-stage worm gear reducer 16 is connected to one end of the torque shaft 19. The other end of the torque shaft 19 is connected to the differential 13 near the reduction transmission unit via a second coupling 20. Other components and connections are the same as in Specific Embodiment 1.

[0051] In this embodiment, the loading unit is used to apply loading torque to the differential 13 to perform a load test on the differential. The core of the loading unit is to reduce the speed generated by the servo motor 18 through the two-stage worm gear reducer 16 to provide a larger torque. When the loading unit is arranged, one end of the torque shaft 19 passes through the low-speed shaft in the reduction gearbox 8 and is connected to the corresponding differential 13 through the second coupling 20. There is an installation gap between the torque shaft 19 and the low-speed shaft, that is, the rotation of the torque shaft 19 and the rotation of the low-speed shaft do not affect each other. If a coupling is used when the torque shaft 19 is connected to the two-stage worm gear reducer 16, the coupling is also a coupling with a protection device. When the running torque exceeds the design torque, it plays the role of protecting the power closed combination unit. In actual operation, the loading unit should be equipped with a torque meter to measure the applied loading torque.

[0052] The present invention has been disclosed above with preferred embodiments, but it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed structure and technical content to create equivalent embodiments without departing from the scope of the present invention. However, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

[0053] Working principle

[0054] This application provides a back-to-back test bench for the differential of a high-torque horizontal screw centrifuge, which can perform performance tests, load tests, and reliability tests on the differential of a high-torque centrifuge during operation.

[0055] During the performance test of the differential of the high torque centrifuge: the loading unit does not work, only the power unit, speed-increasing transmission unit, speed-reducing transmission unit and differential loading unit work. Before the test begins, the two differentials 13 are installed back to back on both sides of the differential loading unit. After ensuring that the connection of each component of the test bench is stable, the motor 2 is started to generate speed and torque. The speed and torque are transmitted to the two differentials 13 located on the differential loading unit through the speed-increasing transmission unit and the speed-reducing transmission unit in sequence. After receiving the transmission speed and torque, the differentials 13 rotate to test the working performance of the differentials 13.

[0056] During the load test of the differential of the high-torque centrifuge: the power unit, speed-increasing transmission unit, speed-reducing transmission unit, differential loading unit and loading unit all work. The preliminary preparation work is the same as that of the performance test. The difference is that when the differential 13 is working, the loading unit needs to be used to increase the load on it. When the load needs to be increased, the servo motor 18 starts, and the output speed is reduced by the double-stage worm gear reducer 16 to form a large torque. This torque is transmitted to the differential 13 through the torque shaft 19. The differential 13 rotates after obtaining the transmission speed and torque under the intervention of the loading torque, so as to test the working performance of the differential 13 under load conditions.

[0057] When conducting reliability tests on the differential of a high-torque centrifuge: the reliability test is based on the load test. By applying a load to the differential 13 for a long time, the working reliability of the differential 13 under load conditions is tested.

Claims

1. A back-to-back test bench for the differential of a high-torque horizontal screw centrifuge, characterized in that: The test bench includes a power unit, a speed-increasing transmission unit, a speed-reducing transmission unit, a differential loading unit, and an end positioning unit; The power unit, speed-increasing transmission unit, speed-reducing transmission unit, differential loading unit, and end positioning unit are sequentially arranged on the test chamber floor slide rail (1). A differential (13) is installed on each side of the differential loading unit, and the two differentials (13) are set back to back. The power output end of the power unit is connected to the power input end of the speed-increasing transmission unit, the power output end of the speed-increasing transmission unit is connected to the power input end of the speed-reducing transmission unit, the power output end of the speed-reducing transmission unit is connected to the differential (13) on one side of the differential loading unit, and the differential (13) on the other side of the differential loading unit is connected to the end positioning unit. The power output speed of the power unit is sequentially transmitted to the differentials (13) on both sides of the differential loading unit through the speed-increasing transmission unit and the speed-reducing transmission unit. This can be used to conduct performance tests, load tests, and reliability tests on two differentials set back to back.

2. The back-to-back test bench for the differential of a high-torque horizontal screw centrifuge according to claim 1, characterized in that: The power unit includes a motor (2) and a motor bracket (3). The motor (2) is mounted on the slide rail (1) on the floor of the laboratory via the motor bracket (3), and the power output shaft of the motor (2) is set towards the speed-increasing transmission unit. The power output shaft of the motor (2) is connected to the power input end of the speed-increasing transmission unit via the output shaft coupling (4).

3. The back-to-back test bench for the differential of a high-torque horizontal screw centrifuge according to claim 1, characterized in that: The speed-increasing transmission unit includes a speed-increasing gearbox bracket (6) and a speed-increasing gearbox (5). The speed-increasing gearbox (5) is mounted on the laboratory floor slide rail (1) via the speed-increasing gearbox bracket (6). The power input end of the speed-increasing gearbox (5) is connected to the power output shaft of the motor (2) via the output shaft coupling (4). The power output end of the speed-increasing gearbox (5) is connected to the power input end of the speed-reducing transmission unit via the diaphragm coupling (7).

4. The back-to-back test bench for the differential of a high-torque horizontal screw centrifuge according to claim 3, characterized in that: The speed-increasing gearbox (5) includes a speed-increasing gearbox body (51), a power input shaft system (52), a speed-increasing shaft system (53), and a power output shaft system (54). The power input shaft system (52), the speed-increasing shaft system (53), and the power output shaft system (54) are all installed in the speed-increasing gearbox body (51). The power input shaft system (52) is connected to the power output shaft of the motor (2) through the output shaft coupling (4). The power input shaft system (52) is connected to the power output shaft system (54) through the speed-increasing shaft system (53). The power output shaft system (54) is connected to the power input end of the speed reduction transmission unit through the diaphragm coupling (7).

5. A back-to-back test bench for the differential of a high-torque horizontal screw centrifuge according to claim 1 or 4, characterized in that: The reduction transmission unit includes a reduction gearbox (8) and a transmission gearbox bracket (9). The transmission gearbox (8) is mounted on the slide rail (1) on the laboratory floor via the transmission gearbox bracket (9). The power input end of the reduction gearbox (8) is connected to the power output end of the speed-increasing gearbox (5) via a diaphragm coupling (7). The power output end of the reduction gearbox (8) is connected to the power input end of the corresponding differential (13) via a first coupling (10).

6. The back-to-back test bench for the differential of a high-torque horizontal screw centrifuge according to claim 5, characterized in that: The reduction gearbox (8) includes a reduction gearbox body (81), a high-speed input shaft system (82), and a low-speed output shaft system (83). Both the high-speed input shaft system (82) and the low-speed output shaft system (83) are installed in the reduction gearbox body (81). The diaphragm coupling (7) of the high-speed input shaft system (82) is connected to the power output end of the speed-increasing gearbox (5). The high-speed input shaft system (82) is connected to the low-speed output shaft system (83) through a transmission connection. The low-speed output shaft system (83) is connected to the power input end of the corresponding differential (13) through a first coupling (10).

7. A back-to-back test bench for the differential of a high-torque horizontal screw centrifuge according to claim 1 or 6, characterized in that: The test bench also includes a loading unit, which is located on one side of the reduction gear unit. The loading unit is used to add load to the differential (13) located near the reduction gear unit.

8. A back-to-back test bench for the differential of a high-torque horizontal screw centrifuge according to claim 1 or 7, characterized in that: The loading unit includes a two-stage worm gear reducer (16), a reducer bracket (17), a servo motor (18), and a torque shaft (19). The two-stage worm gear reducer (16) is mounted on the slide rail (1) on the floor of the test room via the reducer bracket (17). The power input end of the two-stage worm gear reducer (16) is connected to the power output end of the servo motor (18). The housing of the servo motor (18) is fixedly connected to the housing of the two-stage worm gear reducer (16). The power output end of the two-stage worm gear reducer (16) is connected to one end of the torque shaft (19). The other end of the torque shaft (19) is connected to the differential (13) on the side near the reduction transmission unit via a second coupling (20).

9. A back-to-back test bench for the differential of a high-torque horizontal screw centrifuge according to claim 1 or 8, characterized in that: The differential loading unit includes a differential support assembly (11) and a support bracket (12). The differential support assembly (11) is mounted on the test chamber floor rail (1) via the support bracket (12). The differential support assembly (11) includes a bearing housing (111) and a drive shaft (112). The bearing housing (4) is mounted on the slide rail (1) on the test floor via a support bracket (12). The drive shaft (112) is inserted into the bearing housing (111) and rotatably connected to the bearing housing (4) via a bearing (113). Both ends of the drive shaft (112) extend outside the bearing housing (4), and a differential (13) is inserted into each end of the drive shaft (112).

10. A back-to-back test bench for the differential of a high-torque horizontal screw centrifuge according to claim 1, characterized in that: The end positioning unit includes an end bracket (15) and an end limiting seat (14). The end limiting seat (14) is mounted on the laboratory floor slide rail (1) through the end bracket (15). An end limiting shaft is inserted into the end limiting seat (14). The end limiting shaft is connected to the corresponding differential (13) through a No. 1 coupling.

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