A high-power hydraulic coupling test bench

Abstract

A high-power hydraulic coupling test bench, which relates to the technical field of hydraulic coupling testing. The present invention solves the problem that the existing hydraulic coupling test bench cannot verify the torsional characteristics of the hydraulic coupling installed on the test shaft. The two ends of the torque loading unit of the present invention are respectively connected to the two torque-loading spline shafts between the two torque-loading spline shaft support assemblies, and the two torque-bearing spline shafts are arranged in parallel in the horizontal direction between the torque-bearing spline shaft support assembly and the torsion beam. The jacking device is arranged below the torsion beam, and the torsion shaft is respectively connected to the torque-loading spline shaft and the torque-bearing spline shaft. The torque measuring instrument is installed on the second test shaft, the second test shaft is connected to the torque-loading spline shaft, the first test shaft is connected to the torque-bearing spline shaft, and the second test shaft is connected to the first test shaft through the tested hydraulic coupling. The present invention is used for testing the torque transmission characteristics verification test of hydraulic couplings with different shaft diameters.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic coupling test, and in particular to a high-power hydraulic coupling test bench. Background Art

[0002] The cylinder driving force is output by the electro-hydraulic proportional pressure regulating digital control unit. At the same time, the system has an overload protection function. When the equipment is in abnormal working state, such as slippage of the hydraulic coupling and the test shaft, abnormal cylinder oil pressure, etc., the test bench is protected from damage by power off and pressure relief.

[0003] However, the existing hydraulic coupling test bench has the problem of being unable to verify the torsional characteristics of the hydraulic coupling installed on the test shaft. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing hydraulic coupling test bench cannot verify the torsional characteristics of the hydraulic coupling installed on the test shaft, and further provide a high-power hydraulic coupling test bench.

[0005] The technical solution of the present invention is:

[0006] A high-power hydraulic coupling test bench comprises a torque loading component, a torque bearing component, a torsion bearing shaft component, a tested shaft component and four flange connection components;

[0007] The torque loading assembly is located at the front end of the high-power hydraulic coupling test bench, and the torque loading assembly includes a torque loading unit, two torque loading spline shafts 1, two torque loading spline shaft support assemblies and two first positioning members 15;

[0008] Two torque-loaded spline shaft support assemblies are arranged side by side, and two torque-loaded spline shafts 1 are arranged in parallel in the horizontal direction between the two torque-loaded spline shaft support assemblies. The head end of each torque-loaded spline shaft 1 is rotatably connected to the torque-loaded spline shaft support assembly corresponding to the front end, and the end of each torque-loaded spline shaft 1 is rotatably connected to the torque-loaded spline shaft support assembly corresponding to the rear end. The two ends of the torque-loading unit are rotatably connected to the two torque-loaded spline shafts 1 between the two torque-loaded spline shaft support assemblies, and radial positioning is achieved between the torque-loading unit and the torque-loaded spline shaft 1 through a first positioning member 15;

[0009] The torque bearing assembly is located at the rear end of the high-power hydraulic coupling test bench, and the torque bearing assembly includes a torsion beam 10, a jacking device, a torque bearing spline shaft support assembly, two torque bearing spline shafts 9 and two second positioning members 21;

[0010] The torque bearing spline shaft support assembly and the torsion beam 10 are arranged side by side, and two torque bearing spline shafts 9 are arranged in parallel between the torque bearing spline shaft support assembly and the torsion beam 10 in the horizontal direction. The head end of each torque bearing spline shaft 9 is rotatably connected to the torque bearing spline shaft support assembly corresponding to the front end, and the tail end of each torque bearing spline shaft 9 is rotatably connected to the torsion beam 10 corresponding to the rear end. The jacking device is arranged below the torsion beam 10, and the power output end of the jacking device is connected to the lower part of the torsion beam 10.

[0011] The torsion shaft assembly includes a torsion shaft 7 and a torsion shaft support assembly. The middle portion of the torsion shaft 7 is rotatably connected to the torsion shaft support assembly. The head end of the torsion shaft 7 is connected to the end of the right torque-loading spline shaft 1 through a flange connection assembly. The end of the torsion shaft 7 is connected to the head end of the right torque-bearing spline shaft 9 through a flange connection assembly.

[0012] The tested shaft assembly includes a first test shaft 11, a tested hydraulic coupling 12, a second test shaft 13, a torque meter 14 and a test shaft support assembly. The torque meter 14 is installed on the second test shaft 13. The head end of the second test shaft 13 is connected to the end of the left torque-loaded spline shaft 1 through a flange connection assembly. The middle part of the first test shaft 11 is rotatably connected to the test shaft support assembly. The end of the first test shaft 11 is connected to the head end of the left torque-loaded spline shaft 9 through a flange connection assembly. The end of the second test shaft 13 is connected to the head end of the first test shaft 11 through the tested hydraulic coupling 12.

[0013] Furthermore, the torque loading unit includes N pairs of loading twist handles 3, N pushing cylinders 17, N pulling back cylinders 22 and 4N third positioning members 16, N≥1, N is a positive integer, the N pairs of loading twist handles 3 are arranged side by side, the middle parts of the two loading twist handles 3 in each pair of loading twist handles 3 are respectively sleeved on two torque loading spline shafts 1, and radial positioning is achieved between each torque loading spline shaft 1 and the corresponding N loading twist handles 3 through a first positioning member 15. A pushing cylinder 17 is provided on the upper part of each pair of loading twist handles 3, and the two ends of the pushing cylinder 17 are rotatably connected to the upper parts of the two loading twist handles 3 through two third positioning members 16, and a pulling back cylinder 22 is provided on the lower part of each pair of loading twist handles 3, and the two ends of the pulling back cylinder 22 are rotatably connected to the lower parts of the two loading twist handles 3 through two third positioning members 16.

[0014] Furthermore, the torque-loaded spline shaft support assembly and the torque-bearing spline shaft support assembly have the same structure. The torque-loaded spline shaft support assembly includes a first bearing seat, a first fixed bearing seat bracket 2 and two first sliding bearings 4. The first bearing seat is a rectangular plate structure. The first bearing seat is vertically arranged on the upper part of the first fixed bearing seat bracket 2. The lower end face of the first bearing seat is connected to the upper end face of the first fixed bearing seat bracket 2 by welding. Two first axial holes that cooperate with the torque-loaded spline shaft 1 or the torque-bearing spline shaft 9 are provided on the front end face of the first bearing seat. A first sliding bearing 4 is provided between the torque-loaded spline shaft 1 or the torque-bearing spline shaft 9 and the first bearing seat.

[0015] Furthermore, the torsion shaft support assembly and the test shaft support assembly have the same structure. The torsion shaft support assembly includes a second sliding bearing, a second bearing seat and a second fixed bearing seat bracket 8. The second bearing seat is a plate-like structure. The second bearing seat is vertically arranged on the upper part of the second fixed bearing seat bracket 8. The lower end surface of the second bearing seat is connected to the upper end surface of the second fixed bearing seat bracket 8 by welding. A second axial hole matching the torsion shaft 7 or the first test shaft 11 is provided on the front end surface of the second bearing seat, and a second sliding bearing is provided between the torsion shaft 7 or the first test shaft 11 and the second bearing seat.

[0016] Furthermore, each flange connection assembly includes a first flange, a second flange, a plurality of reaming bolts 5 and a plurality of hydraulic bolts 6. The inner hole of the first flange cooperates with the torque-loaded spline shaft 1 or the torque-bearing spline shaft 9, the inner hole of the second flange cooperates with the torsion shaft 7 or the first test shaft 11 or the second test shaft 13, and the first flange is connected to the second flange by the reaming bolts 5 or the hydraulic bolts 6.

[0017] Furthermore, the first positioning member 15 is a first involute spline, and the torque-loading spline shaft 1 and the loading torsion handle 3 are respectively provided with a first keyway that cooperates with the first involute spline, and the torque-loading spline shaft 1 is radially positioned through the first involute spline and the loading torsion handle 3.

[0018] Furthermore, the second positioning member 21 is a second involute spline, and the torque-bearing spline shaft 9 and the torsion beam 10 are respectively provided with a second keyway that cooperates with the second involute spline, and the torque-bearing spline shaft 9 is radially positioned through the second involute spline and the torsion beam 10.

[0019] Furthermore, the third positioning member 16 is a first pin shaft, and the push cylinder 17 and the pull-back cylinder 22 are both double-rod cylinders. The piston rods on both sides of the push cylinder 17 are rotatably connected to the upper part of the corresponding loading twist handle 3 through two first pin shafts, and the piston rods on both sides of the pull-back cylinder 22 are rotatably connected to the lower part of the corresponding loading twist handle 3 through two first pin shafts.

[0020] Furthermore, it also includes four second pins 18. When N=3, the upper and lower parts of the three left loading twist handles 3 in the three pairs of loading twist handles 3 are positioned by two second pins 18 respectively, and the upper and lower parts of the three right loading twist handles 3 in the three pairs of loading twist handles 3 are positioned by two second pins 18 respectively.

[0021] Furthermore, the lifting device includes two bosses 19 and two lifting devices 20. The two bosses 19 are arranged side by side in the vertical direction directly below the torsion beam 10. A lifting device 20 is respectively provided between each boss 19 and the torsion beam 10. The lower part of the lifting device 20 is fixedly connected to the upper end surface of the corresponding boss 19, and the top of the lifting device 20 is fixedly connected to the lower end surface of the torsion beam 10.

[0022] Compared with the prior art, the present invention has the following effects:

[0023] 1. The high-power hydraulic coupling test bench of the present invention can verify the torsional characteristics of the tested hydraulic coupling installed on the test shaft. During the torque loading process, the external test system will collect the loading torque, displacement and deformation data of the mechanical structure of the test device and the tested hydraulic coupling. The push cylinder group and the pull-back cylinder group at the left end of the bench are driven by the electro-hydraulic control system to load the torque. The upper and lower ends of the two groups of loading torques act with equal and opposite forces to form a couple moment. The torque is converted into torque through the cooperation of the torque combination torsion spline shaft, and the torque acts on the shaft system where the torsion shaft and the test shaft are located respectively. The torque on the two shaft systems produces a bending moment on the torsion beam, and the bending moment is balanced with the bending internal force of the torsion beam. The present invention can test the torque transmission characteristics verification test of hydraulic couplings with different shaft diameters. The static torsion test with maximum loading torsion is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a top view of the high-power hydraulic coupling test bench of the present invention;

[0025] Figure 2 It is a left view of the high-power hydraulic coupling test bench of the present invention;

[0026] Figure 3 It is a right side view of the high-power hydraulic coupling test bench of the present invention. DETAILED DESCRIPTION

[0027] Specific implementation method 1: Combination Figures 1 to 3 The present embodiment is described. A high-power hydraulic coupling test bench of the present embodiment comprises a torque loading assembly, a torque bearing assembly, a torsion bearing shaft assembly, a tested shaft assembly and four flange connection assemblies;

[0028] The torque loading assembly is located at the front end of the high-power hydraulic coupling test bench, and the torque loading assembly includes a torque loading unit, two torque loading spline shafts 1, two torque loading spline shaft support assemblies and two first positioning members 15;

[0029] Two torque-loaded spline shaft support assemblies are arranged side by side, and two torque-loaded spline shafts 1 are arranged in parallel in the horizontal direction between the two torque-loaded spline shaft support assemblies. The head end of each torque-loaded spline shaft 1 is rotatably connected to the torque-loaded spline shaft support assembly corresponding to the front end, and the end of each torque-loaded spline shaft 1 is rotatably connected to the torque-loaded spline shaft support assembly corresponding to the rear end. The two ends of the torque-loading unit are rotatably connected to the two torque-loaded spline shafts 1 between the two torque-loaded spline shaft support assemblies, and radial positioning is achieved between the torque-loading unit and the torque-loaded spline shaft 1 through a first positioning member 15;

[0030] The torque bearing assembly is located at the rear end of the high-power hydraulic coupling test bench, and the torque bearing assembly includes a torsion beam 10, a jacking device, a torque bearing spline shaft support assembly, two torque bearing spline shafts 9 and two second positioning members 21;

[0031] The torque bearing spline shaft support assembly and the torsion beam 10 are arranged side by side, and two torque bearing spline shafts 9 are arranged in parallel between the torque bearing spline shaft support assembly and the torsion beam 10 in the horizontal direction. The head end of each torque bearing spline shaft 9 is rotatably connected to the torque bearing spline shaft support assembly corresponding to the front end, and the tail end of each torque bearing spline shaft 9 is rotatably connected to the torsion beam 10 corresponding to the rear end. The jacking device is arranged below the torsion beam 10, and the power output end of the jacking device is connected to the lower part of the torsion beam 10.

[0032] The torsion shaft assembly includes a torsion shaft 7 and a torsion shaft support assembly. The middle portion of the torsion shaft 7 is rotatably connected to the torsion shaft support assembly. The head end of the torsion shaft 7 is connected to the end of the right torque-loading spline shaft 1 through a flange connection assembly. The end of the torsion shaft 7 is connected to the head end of the right torque-bearing spline shaft 9 through a flange connection assembly.

[0033] The tested shaft assembly includes a first test shaft 11, a tested hydraulic coupling 12, a second test shaft 13, a torque meter 14 and a test shaft support assembly. The torque meter 14 is installed on the second test shaft 13. The head end of the second test shaft 13 is connected to the end of the left torque-loaded spline shaft 1 through a flange connection assembly. The middle part of the first test shaft 11 is rotatably connected to the test shaft support assembly. The end of the first test shaft 11 is connected to the head end of the left torque-loaded spline shaft 9 through a flange connection assembly. The end of the second test shaft 13 is connected to the head end of the first test shaft 11 through the tested hydraulic coupling 12.

[0034] In this embodiment, the first test axis 11 is a short test axis, and the second test axis 13 is a long test axis.

[0035] Specific implementation method 2: Combination Figures 1 to 3 To illustrate the present embodiment, the torque loading unit of the present embodiment includes N pairs of loading twist handles 3, N pushing cylinders 17, N pulling back cylinders 22 and 4N third positioning members 16, N≥1, N is a positive integer, the N pairs of loading twist handles 3 are arranged side by side, the middle parts of the two loading twist handles 3 in each pair of loading twist handles 3 are respectively sleeved on the two torque loading spline shafts 1, each torque loading spline shaft 1 and the corresponding N loading twist handles 3 are radially positioned by a first positioning member 15, a pushing cylinder 17 is provided on the upper part of each pair of loading twist handles 3, and the two ends of the pushing cylinder 17 are rotatably connected to the upper parts of the two loading twist handles 3 through two third positioning members 16, and a pulling back cylinder 22 is provided on the lower part of each pair of loading twist handles 3, and the two ends of the pulling back cylinder 22 are rotatably connected to the lower parts of the two loading twist handles 3 through two third positioning members 16. In this arrangement, the push cylinder 17 generates thrust on the loading twist handle 3, and the pull cylinder 22 generates pulling force on the loading twist handle 3. Due to the existence of the moment, a force couple is formed to generate torque. The thrust and pulling force of the cylinders are set so that the three groups of hydraulic cylinders generate torque. The other components and connection relationships are the same as those in the first embodiment.

[0036] Specific implementation method three: Combination Figures 1 to 3 This embodiment is described. The torque-loaded spline shaft support assembly and the torque-bearing spline shaft support assembly of this embodiment have the same structure. The torque-loaded spline shaft support assembly includes a first bearing seat, a first fixed bearing seat bracket 2 and two first sliding bearings 4. The first bearing seat is a rectangular plate-like structure. The first bearing seat is vertically arranged on the upper part of the first fixed bearing seat bracket 2. The lower end face of the first bearing seat is connected to the upper end face of the first fixed bearing seat bracket 2 by welding. Two first shaft holes matching the torque-loaded spline shaft 1 or the torque-bearing spline shaft 9 are provided on the front end face of the first bearing seat. A first sliding bearing 4 is provided between the torque-loaded spline shaft 1 or the torque-bearing spline shaft 9 and the first bearing seat. In this way, the torque-loaded spline shaft support assembly is used to support the torque-loaded spline shaft 1, and the torque-bearing spline shaft support assembly is used to support the torque-bearing spline shaft 9. Other components and connection relationships are the same as those of the first or second specific embodiments.

[0037] Specific implementation method four: Combination Figures 1 to 3This embodiment is described. The torsion shaft support assembly and the test shaft support assembly of this embodiment have the same structure. The torsion shaft support assembly includes a second sliding bearing, a second bearing seat and a second fixed bearing seat bracket 8. The second bearing seat is a plate-like structure. The second bearing seat is vertically arranged on the upper part of the second fixed bearing seat bracket 8. The lower end face of the second bearing seat is connected to the upper end face of the second fixed bearing seat bracket 8 by welding. The front end face of the second bearing seat is provided with a second shaft hole that matches the torsion shaft 7 or the first test shaft 11. A second sliding bearing is provided between the torsion shaft 7 or the first test shaft 11 and the second bearing seat. With such a configuration, the torsion shaft support assembly is used to support the torsion shaft 7, and the test shaft support assembly is used to support the first test shaft 11. Other components and connection relationships are the same as those of the first, second or third specific embodiments.

[0038] Specific implementation method five: Combination Figures 1 to 3 To explain this embodiment, each flange connection assembly of this embodiment includes a first flange, a second flange, a plurality of reaming bolts 5 and a plurality of hydraulic bolts 6. The inner hole of the first flange cooperates with the torque-loaded spline shaft 1 or the torque-bearing spline shaft 9, and the inner hole of the second flange cooperates with the torsion shaft 7 or the first test shaft 11 or the second test shaft 13. The first flange is connected to the second flange through the reaming bolts 5 or the hydraulic bolts 6. In this way, the torque-loaded spline shaft 1 is connected to the torsion shaft 7 through the flange connection assembly, so that the torque is transmitted to the torsion shaft 7. The torque-loaded spline shaft 1 is connected to the second test shaft 13 through the flange connection assembly. The second test shaft 13 is connected to the first test shaft 11 through the tested hydraulic coupling 12, so that the torque is transmitted to the first test shaft 11 and the second test shaft 13. The torsion shaft 7 and the first test shaft 11 are respectively connected to the two torque-bearing spline shafts 9 through the flange connection assembly. The two torque-bearing spline shafts 9 are both connected to the torsion beam. The torque is converted into a bending moment, and the torsion beam is designed to bear the bending moment. The other components and connection relationships are the same as those of the first, second, third or fourth specific implementation modes.

[0039] Specific implementation method six: Combination Figures 1 to 3 This embodiment is described. The first positioning member 15 of this embodiment is a first involute spline. The torque-loading spline shaft 1 and the loading twist handle 3 are respectively provided with a first keyway that matches the first involute spline. The torque-loading spline shaft 1 is radially positioned between the first involute spline and the loading twist handle 3. In this way, the loading twist handle 3 is connected to the torque-loading spline shaft 1 through the first involute spline, and the first involute spline transmits the torque to the torque-loading spline shaft 1. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four or five.

[0040] Specific implementation method seven: Combination Figures 1 to 3This embodiment is described. The second positioning member 21 of this embodiment is a second involute spline. The torque bearing spline shaft 9 and the torsion beam 10 are respectively provided with a second keyway matched with the second involute spline. The torque bearing spline shaft 9 is radially positioned between the second involute spline and the torsion beam 10. In this way, the torsion beam 10 is connected to the torque bearing spline shaft 9 through the second involute spline, and the second involute spline transmits the torque to the torque bearing spline shaft 9. Other components and connection relationships are the same as those of the first, second, third, fourth, fifth or sixth embodiments.

[0041] Specific implementation method eight: Combination Figures 1 to 3 To explain this embodiment, the third positioning member 16 of this embodiment is a first pin shaft, and both the push cylinder 17 and the pull-back cylinder 22 are double-rod cylinders. The piston rods on both sides of the push cylinder 17 are rotatably connected to the upper part of the corresponding loading twist handle 3 through two first pin shafts, and the piston rods on both sides of the pull-back cylinder 22 are rotatably connected to the lower part of the corresponding loading twist handle 3 through two first pin shafts. In this way, the piston rods on both sides of the push cylinder 17 generate thrust to the loading twist handle 3 through the first pin shaft, and the piston rods on both sides of the pull-back cylinder 22 generate tension to the loading twist handle 3 through the first pin shaft. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five, six or seven.

[0042] Specific implementation method nine: Combination Figures 1 to 3 This embodiment is described. This embodiment also includes four second pins 18. When N=3, the upper and lower parts of the three left loading twist handles 3 in the three pairs of loading twist handles 3 are positioned by two second pins 18, respectively, and the upper and lower parts of the three right loading twist handles 3 in the three pairs of loading twist handles 3 are positioned by two second pins 18, respectively. With this arrangement, the upper parts of the three pairs of loading twist handles 3 are synchronously moved by two second pins 18, respectively, and the lower parts of the three pairs of loading twist handles 3 are synchronously moved by two second pins 18, respectively. Other components and connection relationships are the same as those in the first, second, third, fourth, fifth, sixth, seventh or eighth embodiments.

[0043] Specific implementation method ten: Combination Figures 1 to 3 To explain this embodiment, the jacking device of this embodiment includes two bosses 19 and two jacking devices 20. The two bosses 19 are arranged side by side in the vertical direction just below the torsion beam 10. A jacking device 20 is respectively arranged between each boss 19 and the torsion beam 10. The lower part of the jacking device 20 is fixedly connected to the upper end face of the corresponding boss 19, and the top of the jacking device 20 is fixedly connected to the lower end face of the torsion beam 10. In this way, the jacking device can support the torsion beam 10 and adjust its height. Other components and connection relationships are the same as those of the first, second, third, fourth, fifth, sixth, seventh, eighth or ninth embodiment.

[0044] The jacking device 20 of this embodiment is an air cylinder.

[0045] How it works

[0046] Combination Figures 1 to 3 The working principle of the present invention is described:

[0047] The high-power hydraulic coupling test bench of the present invention is divided into two parts: the torsion bearing shaft and the tested shaft. Three groups of hydraulic cylinders exert force on the loading torque handle 3, the top push cylinder 17 generates thrust, and the pull-back cylinder 22 generates tension. Due to the existence of the moment, a couple is formed to generate torque. The thrust and tension of the cylinders are set to make the three groups of hydraulic cylinders generate torque. The loading torque handle 3 is connected to the torque loading spline shaft 1 through the first involute spline, and the first involute spline transmits the torque to the torque loading spline shaft 1. The torque-loaded spline shaft 1 is connected to the tested shaft and the torsion shaft 7 through a flange connection assembly. The tested shaft includes a first test shaft 11 and a second test shaft 13. The first test shaft 11 and the second test shaft 13 are connected through a tested hydraulic coupling 12, so that the torque is transmitted to the tested shaft and the torsion shaft 7. The tested shaft and the torsion shaft 7 are connected to the torque-loaded spline shaft 9 through a flange connection assembly. The two torque-loaded spline shafts 9 are connected to the torsion beam 10. The torque is converted into a bending moment. The torsion beam 10 is designed to bear the bending moment. The torque meter 14 is installed on the second test shaft 13.

Claims

1. A high-power hydraulic coupling test bench, characterized by: It includes a torque loading assembly, a torque bearing assembly, a torsion bearing shaft assembly, a tested shaft assembly and four flange connection assemblies; The torque loading assembly is located at the front end of the high-power hydraulic coupling test bench, and comprises a torque loading unit, two torque loading spline shafts (1), two torque loading spline shaft support assemblies and two first positioning members (15); Two torque-loading spline shaft support assemblies are arranged side by side, and two torque-loading spline shafts (1) are arranged in parallel in the horizontal direction between the two torque-loading spline shaft support assemblies. The head end of each torque-loading spline shaft (1) is rotatably connected to the torque-loading spline shaft support assembly corresponding to the front end, and the tail end of each torque-loading spline shaft (1) is rotatably connected to the torque-loading spline shaft support assembly corresponding to the rear end. The two ends of the torque-loading unit are respectively rotatably connected to the two torque-loading spline shafts (1) between the two torque-loading spline shaft support assemblies, and radial positioning is achieved between the torque-loading unit and the torque-loading spline shaft (1) by a first positioning member (15); The torque bearing assembly is located at the rear end of the high-power hydraulic coupling test bench, and comprises a torsion beam (10), a jacking device, a torque bearing spline shaft support assembly, two torque bearing spline shafts (9) and two second positioning members (21); The torque-bearing spline shaft support assembly and the torsion beam (10) are arranged side by side, and two torque-bearing spline shafts (9) are arranged in parallel between the torque-bearing spline shaft support assembly and the torsion beam (10) in the horizontal direction. The head end of each torque-bearing spline shaft (9) is rotatably connected to the torque-bearing spline shaft support assembly corresponding to the front end, and the tail end of each torque-bearing spline shaft (9) is rotatably connected to the torsion beam (10) corresponding to the rear end. The jacking device is arranged below the torsion beam (10), and the power output end of the jacking device is connected to the lower part of the torsion beam (10); The torsion shaft assembly comprises a torsion shaft (7) and a torsion shaft support assembly, the middle portion of the torsion shaft (7) is rotatably connected to the torsion shaft support assembly, the head end of the torsion shaft (7) is connected to the end of the right torque-loading spline shaft (1) via a flange connection assembly, and the end of the torsion shaft (7) is connected to the head end of the right torque-bearing spline shaft (9) via a flange connection assembly; The tested shaft assembly comprises a first test shaft (11), a tested hydraulic coupling (12), a second test shaft (13), a torque measuring instrument (14) and a test shaft support assembly. The torque measuring instrument (14) is mounted on the second test shaft (13). The head end of the second test shaft (13) is connected to the end of a left torque-loaded spline shaft (1) via a flange connection assembly. The middle portion of the first test shaft (11) is rotatably connected to the test shaft support assembly. The end of the first test shaft (11) is connected to the head end of a left torque-loaded spline shaft (9) via a flange connection assembly. The end of the second test shaft (13) is connected to the head end of the first test shaft (11) via the tested hydraulic coupling (12).

2. A high-power hydraulic coupling test bench according to claim 1, characterized in that: The torque loading unit comprises N pairs of loading twist handles (3), N push cylinders (17), N pull-back cylinders (22) and 4N third positioning members (16), N≥1, N is a positive integer, the N pairs of loading twist handles (3) are arranged side by side, the middle parts of the two loading twist handles (3) in each pair of loading twist handles (3) are respectively sleeved on two torque loading spline shafts (1), each torque loading spline shaft (1) and the corresponding N loading twist handles (3) are radially positioned via a first positioning member (15), a push cylinder (17) is provided at the upper part of each pair of loading twist handles (3), the two ends of the push cylinder (17) are rotatably connected to the upper parts of the two loading twist handles (3) via two third positioning members (16), a pull-back cylinder (22) is provided at the lower part of each pair of loading twist handles (3), the two ends of the pull-back cylinder (22) are rotatably connected to the lower parts of the two loading twist handles (3) via two third positioning members (16), respectively.

3. A high-power hydraulic coupling test bench according to claim 2, characterized in that: The torque-loaded spline shaft support assembly and the torque-bearing spline shaft support assembly have the same structure. The torque-loaded spline shaft support assembly comprises a first bearing seat, a first fixed bearing seat bracket (2) and two first sliding bearings (4). The first bearing seat is a rectangular plate-shaped structure. The first bearing seat is vertically arranged on the upper part of the first fixed bearing seat bracket (2). The lower end surface of the first bearing seat is connected to the upper end surface of the first fixed bearing seat bracket (2) by welding. Two first shaft holes matching the torque-loaded spline shaft (1) or the torque-bearing spline shaft (9) are arranged on the front end surface of the first bearing seat. A first sliding bearing (4) is arranged between the torque-loaded spline shaft (1) or the torque-bearing spline shaft (9) and the first bearing seat.

4. A high-power hydraulic coupling test bench according to claim 3, characterized in that: The torsion shaft support assembly and the test shaft support assembly have the same structure. The torsion shaft support assembly includes a second sliding bearing, a second bearing seat and a second fixed bearing seat bracket (8). The second bearing seat is a plate-like structure. The second bearing seat is vertically arranged on the upper part of the second fixed bearing seat bracket (8). The lower end surface of the second bearing seat is connected to the upper end surface of the second fixed bearing seat bracket (8) by welding. A second shaft hole matching the torsion shaft (7) or the first test shaft (11) is provided on the front end surface of the second bearing seat. A second sliding bearing is provided between the torsion shaft (7) or the first test shaft (11) and the second bearing seat.

5. A high-power hydraulic coupling test bench according to claim 4, characterized in that: Each flange connection assembly comprises a first flange, a second flange, a plurality of reaming bolts (5) and a plurality of hydraulic bolts (6); the inner hole of the first flange cooperates with a torque-loaded spline shaft (1) or a torque-bearing spline shaft (9); the inner hole of the second flange cooperates with a torsion-bearing shaft (7) or a first test shaft (11) or a second test shaft (13); and the first flange is connected to the second flange via the reaming bolts (5) or the hydraulic bolts (6).

6. A high-power hydraulic coupling test bench according to claim 5, characterized in that: The first positioning member (15) is a first involute spline, and the torque-loading spline shaft (1) and the loading twist handle (3) are respectively provided with a first keyway that cooperates with the first involute spline, and the torque-loading spline shaft (1) is radially positioned through the first involute spline and the loading twist handle (3).

7. A high-power hydraulic coupling test bench according to claim 6, characterized in that: The second positioning member (21) is a second involute spline, and the torque-bearing spline shaft (9) and the torsion beam (10) are respectively provided with second keyways that cooperate with the second involute spline. The torque-bearing spline shaft (9) is radially positioned through the second involute spline and the torsion beam (10).

8. A high-power hydraulic coupling test bench according to claim 2, characterized in that: The third positioning member (16) is a first pin shaft, and both the push cylinder (17) and the pull-back cylinder (22) are double-rod cylinders. The piston rods on both sides of the push cylinder (17) are rotatably connected to the upper part of the corresponding loading twist handle (3) through two first pin shafts, and the piston rods on both sides of the pull-back cylinder (22) are rotatably connected to the lower part of the corresponding loading twist handle (3) through two first pin shafts.

9. A high-power hydraulic coupling test bench according to claim 2 or 8, characterized in that: It also includes four second pins (18). When N=3, the upper and lower parts of the three left loading twist handles (3) in the three pairs of loading twist handles (3) are positioned respectively by two second pins (18), and the upper and lower parts of the three right loading twist handles (3) in the three pairs of loading twist handles (3) are positioned respectively by two second pins (18).

10. A high-power hydraulic coupling test bench according to claim 9, characterized in that: The jacking device comprises two bosses (19) and two jacking devices (20). The two bosses (19) are arranged side by side in the vertical direction directly below the torsion beam (10). A jacking device (20) is respectively arranged between each boss (19) and the torsion beam (10). The lower part of the jacking device (20) is fixedly connected to the upper end surface of the corresponding boss (19), and the top of the jacking device (20) is fixedly connected to the lower end surface of the torsion beam (10).

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