Coupling torsional fatigue testing machine

Abstract

The present application relates to the field of coupling detection technology, and in particular to a coupling torsional fatigue testing machine, including a base, a fixed column, a movable column and a torsional drive mechanism, wherein the fixed column is fixedly mounted on one side of the base, the movable column is slidably assembled on the other side of the base along the Y-axis and is fixed by multiple sets of radial displacement adjustment members, a first mandrel connecting portion is rotatably arranged on the top of the fixed column, a second mandrel connecting portion is fixedly arranged on the top of the movable column, the central axes of the first mandrel connecting portion and the second mandrel connecting portion are both arranged along the X-axis direction, the two ends of the coupling to be tested are detachably assembled on mandrel one and mandrel two respectively through tensioning connecting portions, and the torsional drive mechanism is installed on the base. The coupling torsional fatigue testing machine of the present application can firmly lock a diaphragm coupling with a complex structure, which is sufficient to be used to specifically detect the torsional fatigue strength of the diaphragm coupling, and the detection efficiency is relatively high.

Description

Technical Field

[0001] The present application relates to the technical field of coupling detection, and in particular to a coupling torsional fatigue testing machine. Background Art

[0002] A coupling is a device that connects two shafts or a shaft and a rotating part, and rotates together during the transmission of motion and power. It is used to firmly connect the driving shaft and the driven shaft in different mechanisms to rotate together and transmit motion and torque. It is a mechanical part that does not disengage under normal circumstances. Sometimes it is also used as a safety device to prevent the connected parts from bearing excessive loads and play an overload protection role. Diaphragm coupling is a type of coupling.

[0003] After searching, the Chinese patent with application number: 201610068527.7 discloses a diaphragm coupling, including a first connecting body and a second connecting body; the first connecting body and the second connecting body have a first outer edge body and a second outer edge body at the opposite ends, and a first buffer plate and a second buffer plate are provided between the first connecting body and the second connecting body, and the first buffer plate and the second buffer plate are separated by a spacer; a first radial slit and a first axial slit are provided on the first connecting body, and a second axial slit is provided on the second connecting body; the first radial slit is perpendicular to the first axial slit, the first radial slit is opened below the first axial slit, the first axial slit is separated from the first radial slit by a preset distance, and the second axial slit divides the second connecting body into two independent bodies connected by screws.

[0004] With respect to the above-mentioned related technologies, the inventor believes that there are the following technical defects that need to be improved:

[0005] In order to ensure product quality, every diaphragm coupling leaving the factory needs to be quality tested, especially the torsional fatigue strength of the diaphragm coupling. Due to the complex structure of the diaphragm coupling and the difficulty in fixing it, there is no mature testing equipment on the market to specifically test the torsional fatigue strength of the diaphragm coupling. Summary of the invention

[0006] The present application provides a coupling torsional fatigue testing machine to improve the following technical problems:

[0007] Since the structure of the diaphragm coupling is complex and difficult to fix, there is no mature testing equipment on the market to specifically test the torsional fatigue strength of the diaphragm coupling.

[0008] The present application provides a coupling torsional fatigue testing machine, which adopts the following technical solution:

[0009] A coupling torsional fatigue testing machine comprises a base, a fixed column, a movable column and a torsional driving mechanism, wherein the fixed column is fixedly mounted on one side of the base, the movable column is slidably assembled on the other side of the base along the Y-axis and is fixed by a plurality of sets of radial displacement adjusting members, a first core shaft connecting part is rotatably arranged on the top of the fixed column, a second core shaft connecting part is fixedly arranged on the top of the movable column, the central axes of the first core shaft connecting part and the second core shaft connecting part are both arranged along the X-axis direction, the first core shaft connecting part is used to fix core shaft one, the second core shaft connecting part is used to fix core shaft two, the two ends of the coupling to be tested are detachably assembled on core shaft one and core shaft two respectively by tensioning connecting parts, and the torsional driving mechanism is mounted on the base and drives the first core shaft connecting part to rotate forward and reverse along its central axis.

[0010] In an achievable technical solution of the present application, a rotating cavity is provided on the top of the fixed column, the first core shaft connecting part is a cylindrical structure and is located in the rotating cavity, the inner circumferential wall of the first core shaft connecting part is provided with a first internal spline groove, the first internal spline groove is spline-connected to the end of core shaft one, the outer circumferential wall of the first core shaft connecting part is provided with an external spline, the external spline is spline-connected to the power output component of the torsional drive mechanism.

[0011] In an achievable technical solution of the present application, a first cover plate is provided at the outer end of the first core shaft connecting portion, and a first adjusting bolt is installed on the central thread of the first cover plate, and the inner end thread of the first adjusting bolt is installed on the outer end of the core shaft one, and a plurality of first tightening bolts are also threadedly installed on the first cover plate, and the inner end of the first tightening bolt is tightened against the outer end surface of the core shaft one, and the plurality of first tightening bolts are evenly spaced around the circumference of the first adjusting bolt.

[0012] In an achievable technical solution of the present application, the second core shaft connecting portion is a cylindrical structure, the inner circumferential wall of the second core shaft connecting portion is provided with a second internal spline groove, and the second internal spline groove is spline-connected to the end of the second core shaft.

[0013] In an achievable technical solution of the present application, a second cover plate is provided at the outer end of the second core shaft connecting portion, and a second adjusting bolt is installed on the central thread of the second cover plate, and the inner end thread of the second adjusting bolt is installed on the outer end of the core shaft two, and a plurality of second tightening bolts are also threadedly installed on the second cover plate, and the inner end of the second tightening bolt is tightened against the outer end surface of the core shaft two, and the plurality of second tightening bolts are evenly spaced around the circumference of the second adjusting bolt.

[0014] In an achievable technical solution of the present application, a plurality of Y-axis slide rails arranged in parallel and at intervals are provided on the base, a plurality of sliders are connected to the bottom of the movable column by bolts, and the sliders are slidably assembled in the Y-axis slide rails.

[0015] In an achievable technical solution of the present application, the radial displacement adjustment member includes a fixed block and a radial adjustment bolt, the fixed block is fixed on the base, the radial adjustment bolt is threadedly assembled and passes through the fixed block, and the inner end of the radial adjustment bolt is tightly pressed against the bottom of the movable column.

[0016] In an achievable technical solution of the present application, the tensioning connection portion includes a flange sleeve, an outer sleeve and multiple groups of connecting bolts, the multiple groups of connecting bolts are evenly arranged in a circle along the central axis of the flange sleeve, the connecting bolts are threadedly assembled and penetrate the end of the coupling to be tested, the outer end of the connecting bolt is threadedly assembled on the end of the outer sleeve, the two flange sleeves are respectively used for core shaft one and core shaft two to penetrate, the outer circumferential wall of the flange sleeve is set as an outer conical inclined surface, the inner circumferential wall of the outer sleeve is set as an inner conical inclined surface, and the outer conical inclined surface and the inner conical inclined surface fit each other.

[0017] In an achievable technical solution of the present application, the torsion drive mechanism includes a base, a torsion arm, a hydraulic jack, a pressure sensor, a hydraulic system and a computer processing system, one end of the torsion arm is fixedly connected to the first core shaft connection part, the torsion arm is perpendicular to the core shaft and arranged along the Y-axis direction, the base is fixed on the pedestal, the hydraulic jack is installed on the base, the hydraulic jack is arranged vertically and the top output end is connected to the bottom of the other end of the torsion arm, the pressure sensor is arranged between the bottom of the hydraulic jack and the base, the hydraulic jack is connected to the hydraulic system, and the computer processing system is electrically connected to the pressure sensor and controls the operation of the hydraulic system.

[0018] In an achievable technical solution of the present application, the torsion arm includes a torsion cylinder, a connecting plate and a connecting end, the width of the connecting plate gradually decreases from one end to the other end, the connecting end is provided at the end of the connecting plate close to the hydraulic jack, the torsion cylinder is provided at the end of the connecting plate close to the first core shaft connection part, and a third internal spline groove is provided on the inner circumferential wall of the torsion cylinder, and the third internal spline groove is adapted to the external spline of the first core shaft connection part.

[0019] In summary, the present application includes at least one of the following beneficial technical effects:

[0020] The two customized tensioning connection parts can make the coupling to be tested firmly connected with the first and second mandrels, and the first mandrel can also be firmly connected with the first mandrel connection part, and the second mandrel can also be firmly connected with the second mandrel connection part. The torsion drive mechanism is started and the first mandrel connection part is driven to rotate forward and reverse along its central axis, which is convenient for the torsional fatigue strength of the coupling. The radial position between the moving column and the base can be adjusted by the radial displacement adjustment part to adapt to various complex installation conditions and products of different models and sizes.

[0021] The overall structure is stable and firm, easy to operate, and can firmly lock the diaphragm coupling with complex structure. It is sufficient to be used to specifically detect the torsional fatigue strength of the diaphragm coupling, and the detection efficiency is relatively high. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 2 is a schematic diagram of the main structure of the coupling torsion fatigue testing machine according to an embodiment of the present application;

[0024] Figure 2 is a side structural schematic diagram of a coupling torsional fatigue testing machine according to an embodiment of the present application;

[0025] Figure 3 It is a schematic diagram of the top structure of the coupling torsional fatigue testing machine according to an embodiment of the present application.

[0026] Description of reference numerals:

[0027] 100, coupling to be tested; 200, mandrel 1; 300, mandrel 2;

[0028] 1. Base; 11. Y-axis slide rail;

[0029] 2. Fixed column; 21. Rotating cavity;

[0030] 3. Moving column; 31. Slider;

[0031] 4. Torsion drive mechanism; 41. Base; 42. Torsion arm; 421. Torsion cylinder; 422. Connecting plate; 423. Connecting end; 424. Reinforcement plate; 43. Hydraulic jack; 44. Pressure sensor; 45. Hydraulic system; 46. Computer processing system;

[0032] 5. radial displacement adjusting member; 51. fixing block; 52. radial adjusting bolt;

[0033] 6. First spindle connection portion; 61. First inner spline groove; 62. External spline; 63. First cover plate; 64. First adjustment bolt; 65. First tension bolt;

[0034] 7. Second mandrel connecting portion; 71. Second inner spline groove; 72. Second cover plate; 73. Second adjusting bolt; 74. Second tensioning bolt;

[0035] 8. tensioning connection; 81. flange sleeve; 82. outer sleeve; 83. connecting bolt;

[0036] 9. Limiting disc. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] The following is combined with Figure 1-3 This application is described in further detail.

[0042] The present application embodiment discloses a coupling torsional fatigue testing machine. Figure 1-3The coupling torsion fatigue testing machine includes a base 1, a fixed column 2, a movable column 3 and a torsion driving mechanism 4, the fixed column 2 is fixedly installed on one side of the base 1, the movable column 3 is slidably assembled on the other side of the base 1 along the Y axis and is fixed by multiple sets of radial displacement adjusting members 5, a first core shaft connecting part 6 is rotatably arranged on the top of the fixed column 2, a second core shaft connecting part 7 is fixedly arranged on the top of the movable column 3, the central axes of the first core shaft connecting part 6 and the second core shaft connecting part 7 are both arranged along the X-axis direction, the first core shaft connecting part 6 is used to fix the core shaft 1 200, the second core shaft connecting part 7 is used to fix the core shaft 2 300, the two ends of the coupling 100 to be tested are detachably assembled on the core shaft 1 200 and the core shaft 2 300 respectively through the tensioning connecting part 8, the torsion driving mechanism 4 is installed on the base 1 and drives the first core shaft connecting part 6 to rotate forward and reverse along its central axis.

[0043] In order to improve the stability of the whole equipment, the base 1, the fixed column 2, and the movable column 3 are all welded by multiple thick steel plates. In this embodiment, a rotating cavity 21 is arranged on the top of the fixed column 2, the first mandrel connecting part 6 is a cylindrical structure and is located in the rotating cavity 21, the inner peripheral wall of the first mandrel connecting part 6 is provided with a first inner spline groove 61, the first inner spline groove 61 is spline-connected with the end of the mandrel 200, and the outer peripheral wall of the first mandrel connecting part 6 is provided with an outer spline 62, and the outer spline 62 is spline-connected with the power output component of the torsion drive mechanism 4.

[0044] In order to facilitate fine-tuning of the axial position of the core shaft 200, a first axial displacement adjustment member is provided at the outer end of the first core shaft connecting part 6. Specifically, a first cover plate 63 is provided at the outer end of the first core shaft connecting part 6. The center thread of the first cover plate 63 is equipped with a first adjusting bolt 64. The inner end of the first adjusting bolt 64 is threadedly assembled on the outer end of the core shaft 200. A plurality of first tightening bolts 65 are also threadedly assembled on the first cover plate 63. The inner end of the first tightening bolt 65 is tightened against the outer end surface of the core shaft 200. The plurality of first tightening bolts 65 are evenly spaced around the circumference of the first adjusting bolt 64.

[0045] The first spindle connecting portion 6 designed above has a simple structure and is easy to assemble. The power output component (i.e., the first spindle connecting portion 6) of the fixed spindle 200 and the torsion drive mechanism 4 is realized by spline connection. Figure 2 The torsion arm 42 in the coupling 100 has stable force transmission, which is conducive to the stable completion of the torsion purpose of the coupling 100 to be tested.

[0046] In order to further improve the stability of the core shaft 200 during the rotation process, a limiting disc 9 is fixed to the inner side of the fixed column 2 by multiple bolts. A circular hole for the core shaft 200 to pass through is just provided in the middle of the limiting disc 9, and multiple bolts are evenly arranged in a circle along the center of the limiting disc 9.

[0047] In this embodiment, the second core shaft connecting portion 7 is a cylindrical structure, and the inner peripheral wall of the second core shaft connecting portion 7 is provided with a second inner spline groove 71 , and the second inner spline groove 71 is spline-connected to the end of the second core shaft 300 .

[0048] In order to facilitate fine-tuning of the axial position of the second core shaft 300, a second axial displacement adjustment member is provided at the outer end of the second core shaft connecting part 7. Specifically, a second cover plate 72 is provided at the outer end of the second core shaft connecting part 7. The center thread of the second cover plate 72 is equipped with a second adjusting bolt 73. The inner end of the second adjusting bolt 73 is threadedly assembled on the outer end of the second core shaft 300. A plurality of second tightening bolts 74 are also threadedly assembled on the second cover plate 72. The inner end of the second tightening bolt 74 is tightened against the outer end surface of the second core shaft 300. The plurality of second tightening bolts 74 are evenly spaced around the circumference of the second adjusting bolt 73.

[0049] The second core shaft connecting portion 7 designed as above has a simple structure and is easy to assemble. The second core shaft 300 is fixed by means of a spline connection, which can keep the second core shaft 300 relatively stable, and is conducive to the stable completion of the torsion purpose of the coupling 100 to be tested.

[0050] Under the premise of not affecting the torsion test, in order to facilitate the stable sliding of the moving column 3 and realize a slight radial displacement between the core shaft 2 300 and the core shaft 1 200, a plurality of Y-axis slide rails 11 arranged in parallel at intervals are provided on the base 1, and a plurality of sliders 31 are connected to the bottom of the moving column 3 by bolts, and a guide key is provided between the bottom of the moving column 3 and the slider 31, and the slider 31 is slidably assembled in the Y-axis slide rail 11.

[0051] In this embodiment, the radial displacement adjustment member 5 includes a fixed block 51 and a radial adjustment bolt 52. The fixed block 51 is fixed on the base 1. The radial adjustment bolt 52 is threadedly assembled and passes through the fixed block 51. The inner end of the radial adjustment bolt 52 is tightly pressed against the bottom of the movable column 3.

[0052] The radial displacement adjusting member 5 designed as above has a simple structure and can achieve the purpose of fine-tuning the radial displacement of the moving column 3 by abutting against it, and is convenient to install and adjust.

[0053] In this embodiment, the tensioning connection part 8 includes a flange sleeve 81, an outer sleeve 82 and multiple groups of connecting bolts 83. The multiple groups of connecting bolts 83 are evenly arranged in a circle along the central axis of the flange sleeve 81. The connecting bolts 83 are threadedly assembled and pass through the end of the coupling 100 to be tested. The outer end of the connecting bolt 83 is threadedly assembled on the end of the outer sleeve 82. The two flange sleeves 81 are respectively used for the core shaft 1 200 and the core shaft 2 300 to penetrate. The outer peripheral wall of the flange sleeve 81 is set as an outer conical inclined surface, and the inner peripheral wall of the outer sleeve 82 is set as an inner conical inclined surface. The outer conical inclined surface and the inner conical inclined surface fit each other.

[0054] The tensioning connection part 8 designed as above has a simple structure and is firm and stable. When the connecting bolts 83 are gradually tightened, the flange sleeve 81 and the outer sleeve 82 can be driven closer to each other. Combined with the inclined surface extrusion effect of the outer conical inclined surface and the inner conical inclined surface, the coupling 100 to be tested and the core shaft 1 200 and the core shaft 2 300 are firmly connected.

[0055] In this embodiment, the torsion drive mechanism 4 includes a base 41, a torsion arm 42, a hydraulic jack 43, a pressure sensor 44, a hydraulic system 45 and a computer processing system 46. One end of the torsion arm 42 is fixedly connected to the first core shaft connecting part 6. The torsion arm 42 is perpendicular to the core shaft 200 and arranged along the Y-axis direction. The base 41 is fixed on the base 1, and the hydraulic jack 43 is installed on the base 41. The hydraulic jack 43 is arranged vertically and the top output end is connected to the bottom of the other end of the torsion arm 42. The pressure sensor 44 is arranged between the bottom of the hydraulic jack 43 and the base 41. The hydraulic jack 43 is connected to the hydraulic system 45. The computer processing system 46 is electrically connected to the pressure sensor 44 and controls the operation of the hydraulic system 45.

[0056] The torsion arm 42 includes a torsion cylinder 421, a connecting plate 422 and a connecting end 423. The width of the connecting plate 422 gradually decreases from one end to the other end. The connecting plate 422 is provided with a connecting end 423 at the end close to the hydraulic jack 43. The connecting plate 422 is provided with a torsion cylinder 421 at the end close to the first core shaft connecting part 6. A third inner spline groove is provided on the inner circumferential wall of the torsion cylinder 421, and the third inner spline groove is adapted to the outer spline 62 of the first core shaft connecting part 6.

[0057] In order to improve the strength of the connection structure between the torsion tube 421 and the connection plate 422 , a triangular reinforcing rib plate 424 is vertically connected between the outer peripheral wall of the torsion tube 421 and the two outer side surfaces of the connection plate 422 .

[0058] The torsion drive mechanism 4 designed as above has a stable structure and is easy to operate. It can automatically drive the torsion arm 42 to drive the first core shaft connecting part 6 to rotate stably according to a preset purpose, thereby achieving the torsion purpose.

[0059] The beneficial technical effects of the coupling torsional fatigue testing machine of the embodiment of the present application are roughly as follows:

[0060] The two customized tensioning connecting parts 8 can make the coupling 100 to be tested firmly connected with the core shaft 1 200 and the core shaft 2 300, and the core shaft 1 200 can also be firmly connected with the first core shaft connecting part 6, and the core shaft 2 300 can also be firmly connected with the second core shaft connecting part 7. The torsion drive mechanism 4 is started and the first core shaft connecting part 6 is driven to rotate forward and reverse along its central axis, which is convenient for the torsional fatigue strength of the coupling. The radial position between the moving column 3 and the base 1 can be adjusted by the radial displacement adjusting member 5 to adapt to various complex installation conditions and products of different models and sizes.

[0061] The overall structure is stable and firm, easy to operate, and can firmly lock the diaphragm coupling with complex structure. It is sufficient to be used to specifically detect the torsional fatigue strength of the diaphragm coupling, and the detection efficiency is relatively high.

[0062] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the application should be included in the protection scope of the present application.

Claims

1. A coupling torsional fatigue testing machine, characterized in that: The invention comprises a base (1), a fixed column (2), a movable column (3) and a torsion drive mechanism (4), wherein the fixed column (2) is fixedly mounted on one side of the base (1), the movable column (3) is slidably assembled on the other side of the base (1) along the Y axis and is fixed by means of a plurality of radial displacement adjustment members (5), a first mandrel connecting portion (6) is rotatably provided at the top of the fixed column (2), a second mandrel connecting portion (7) is fixedly provided at the top of the movable column (3), and the first mandrel connecting portion (6) and the movable column (3) are connected to the movable column (3) so as to rotate and rotate. The central axis of the second core shaft connection part (7) is arranged along the X-axis direction, the first core shaft connection part (6) is used to fix the core shaft one (200), and the second core shaft connection part (7) is used to fix the core shaft two (300), and the two ends of the coupling (100) to be tested are detachably assembled on the core shaft one (200) and the core shaft two (300) respectively through the tension connection part (8), and the torsion drive mechanism (4) is installed on the base (1) and drives the first core shaft connection part (6) to rotate forward and reverse along its central axis; The torsion drive mechanism (4) comprises a base (41), a torsion arm (42), a hydraulic jack (43), a pressure sensor (44), a hydraulic system (45) and a computer processing system (46); one end of the torsion arm (42) is fixedly connected to the first spindle connection part (6); the torsion arm (42) is perpendicular to the spindle 1 (200) and arranged along the Y-axis direction; the base (41) is fixed on the pedestal (1); the hydraulic jack (43) is installed on the base (41); the hydraulic jack (43) is arranged vertically and the top output end is connected to the bottom of the other end of the torsion arm (42); the pressure sensor (44) is arranged between the bottom of the hydraulic jack (43) and the base (41); the hydraulic jack (43) is connected to the hydraulic system (45); the computer processing system (46) is electrically connected to the pressure sensor (44) and controls the operation of the hydraulic system (45); The coupling is a diaphragm coupling.

2. The coupling torsional fatigue testing machine according to claim 1, characterized in that: A rotating cavity (21) is provided at the top of the fixed column (2); the first core shaft connecting part (6) is a cylindrical structure and is located in the rotating cavity (21); the inner peripheral wall of the first core shaft connecting part (6) is provided with a first internal spline groove (61); the first internal spline groove (61) is spline-connected to the end of the core shaft one (200); the outer peripheral wall of the first core shaft connecting part (6) is provided with an external spline (62); the external spline (62) is spline-connected to the power output component of the torsion drive mechanism (4).

3. The coupling torsional fatigue testing machine according to claim 2, characterized in that: A first cover plate (63) is provided at the outer end of the first core shaft connecting part (6), and a first adjusting bolt (64) is installed on the central thread of the first cover plate (63). The inner end of the first adjusting bolt (64) is installed on the outer end of the core shaft (200). A plurality of first tightening bolts (65) are also installed on the first cover plate (63) through threads, and the inner end of the first tightening bolt (65) is pressed against the outer end surface of the core shaft (200). The plurality of first tightening bolts (65) are evenly spaced around the circumference of the first adjusting bolt (64).

4. The coupling torsional fatigue testing machine according to claim 1, characterized in that: The second core shaft connection part (7) is a cylindrical structure, and the inner peripheral wall of the second core shaft connection part (7) is provided with a second inner spline groove (71), and the second inner spline groove (71) is spline-connected to the end of the second core shaft (300).

5. The coupling torsional fatigue testing machine according to claim 4, characterized in that: A second cover plate (72) is provided at the outer end of the second core shaft connecting part (7), and the central thread of the second cover plate (72) is equipped with a second adjusting bolt (73), and the inner end of the second adjusting bolt (73) is threadedly assembled on the outer end of the second core shaft (300). A plurality of second tightening bolts (74) are also threadedly assembled on the second cover plate (72), and the inner end of the second tightening bolt (74) is tightened against the outer end surface of the second core shaft (300), and the plurality of second tightening bolts (74) are evenly spaced around the circumference of the second adjusting bolt (73).

6. The coupling torsional fatigue testing machine according to claim 1, characterized in that: The base (1) is provided with a plurality of Y-axis slide rails (11) arranged in parallel and at intervals, and the bottom of the movable column (3) is connected with a plurality of sliding blocks (31) by bolts, and the sliding blocks (31) are slidably assembled in the Y-axis slide rails (11).

7. The coupling torsional fatigue testing machine according to claim 6, characterized in that: The radial displacement adjustment member (5) comprises a fixing block (51) and a radial adjustment bolt (52), wherein the fixing block (51) is fixed on the base (1), the radial adjustment bolt (52) is threadedly assembled and penetrates the fixing block (51), and the inner end of the radial adjustment bolt (52) is tightly pressed against the bottom of the movable column (3).

8. The coupling torsional fatigue testing machine according to claim 1, characterized in that: The tensioning connection part (8) comprises a flange sleeve (81), an outer sleeve (82) and a plurality of groups of connecting bolts (83). The plurality of groups of connecting bolts (83) are evenly spaced and arranged in a circle along the central axis of the flange sleeve (81). The connecting bolts (83) are threadedly assembled and penetrate the end of the coupling (100) to be tested. The outer end of the connecting bolt (83) is threadedly assembled on the end of the outer sleeve (82). The two flange sleeves (81) are respectively provided for the core shaft 1 (200) and the core shaft 2 (300) to penetrate. The outer peripheral wall of the flange sleeve (81) is provided as an outer conical inclined surface, and the inner peripheral wall of the outer sleeve (82) is provided as an inner conical inclined surface. The outer conical inclined surface and the inner conical inclined surface fit each other.

9. The coupling torsional fatigue testing machine according to claim 2, characterized in that: The torsion arm (42) comprises a torsion cylinder (421), a connecting plate (422) and a connecting end (423), wherein the width of the connecting plate (422) gradually decreases from one end to the other end, and the connecting end (423) is arranged at the end of the connecting plate (422) close to the hydraulic jack (43), and the torsion cylinder (421) is arranged at the end of the connecting plate (422) close to the first core shaft connecting part (6), and a third inner spline groove is arranged on the inner peripheral wall of the torsion cylinder (421), and the third inner spline groove is adapted to the outer spline (62) of the first core shaft connecting part (6).

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