Torsion tensile testing machine

Abstract

The invention discloses a torsion tensile testing machine which comprises a rack, a first main shaft, a coupler, a tensile driving assembly and a first torsion driving assembly, the first main shaft is connected with one end of the test piece, the test piece is installed on the rack, the coupler comprises a pulling plate and two bearings, a convex disc is arranged in the middle of the first main shaft, the two bearings are arranged on the first main shaft in a sleeving mode and located on the two sides of the convex disc respectively, and the stretching driving assembly is connected with the pulling plate. The stretching driving assembly applies an axial load to the first main shaft through the pulling plate, and the first torsion driving assembly applies a torsion load to the test piece. The tension and compression load and the torsion load from the tension driving assembly and the first torsion driving assembly are integrated to the first main shaft through the coupler, the first main shaft is utilized to apply the set static or dynamic tension and compression load and torsion load to the test pup joint at the same time, and various complex stresses borne by a drill rod of the top drive drilling machine during working are simulated. Technicians are helped to evaluate and test the performance of the short circuit more truly.

Description

Technical Field

[0001] The invention relates to the field of mechanical equipment, and in particular to a dynamic tensile torsion testing machine mainly used for testing short circuits of top drive drilling rigs. Background Art

[0002] A top drive drilling rig is a high-tech oil drilling equipment that integrates mechanical, electrical, hydraulic and intelligent control. It is widely used in oil exploration and production operations around the world. When the top drive drilling rig is working, the drill pipe is subjected to high-intensity torque, pressure and impact vibration loads. The force is complex and the working conditions are harsh, so the failure rate of the drill pipe is relatively high. In order to solve the problem of high failure rate of drill pipes, the existing technology introduces a test short circuit; the test short circuit is a special connector used to connect test drill pipes or other downhole tools. Sensors are configured on the test short circuit to monitor the torque, tensile and compressive loads and other parameters of the drill pipe in real time, helping operators to grasp the equipment status in time, avoid safety accidents, and improve operational efficiency, reliability and safety.

[0003] Although test short circuits have been widely used in top drive drilling rigs, there is no testing machine in the prior art that can perform dynamic tensile and torsion tests on test short circuits. At present, all mature testing machines on the market perform single torsion or tensile tests on test pieces. Therefore, it is necessary to design a special testing machine for test short circuits to help technicians evaluate the performance of test short circuits so as to select appropriate test short circuit products and ensure the safety and stability of construction. Summary of the invention

[0004] The technical problem to be solved by the present invention is that there is a lack of professional testing machines for test short circuits in the prior art, which makes it difficult for technicians to perform rapid tension, compression and torsion tests on test short circuit products, and is not conducive to oil drilling practitioners to select suitable test short circuit products.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a torsion tensile testing machine, comprising a frame, a first spindle, a coupler, a tensile drive assembly and a first torsion drive assembly;

[0006] The first spindle is connected to one end of the test piece, the test piece is mounted on the frame, and the two ends of the test piece are generally configured with corresponding fixtures connected to the first spindle, the frame or other mechanisms; the tensile drive assembly and the first torsion drive assembly apply tensile and compressive loads and torsion loads to the test piece through the first spindle; the torsion tensile testing machine of the present invention is mainly used for testing short circuits, so the test piece is the test short circuit; however, the torsion tensile testing machine of the present invention can also be applied to other occasions where torsion tensile testing is required, and it is only necessary to process the corresponding test piece and configure an appropriate fixture;

[0007] The coupler includes a pull plate and two bearings. A convex disc is provided in the middle of the first main shaft. Two bearings are sleeved on the first main shaft and are respectively located on both sides of the convex disc. A bearing hole is provided in the middle of the pull plate and sleeved on the two bearings. The coupler is used to integrate tensile and compressive loads and torsional loads.

[0008] The stretching drive assembly is connected to the pulling plate, and the stretching drive assembly applies an axial load to the first main shaft through the pulling plate, thereby applying a tensile and compressive load to the test piece.

[0009] The first torsion drive assembly drives the first spindle to rotate, thereby applying a torsion load to the test piece.

[0010] The torsional tensile testing machine of the present invention integrates the tensile and compressive loads and torsional loads respectively from the tensile drive assembly and the first torsional drive assembly into the first main shaft through a coupler, and uses the first main shaft to simultaneously apply set static or dynamic tensile and compressive loads and torsional loads to the test short circuit, thereby simulating various complex forces that the drill pipe of the top drive drilling rig is subjected to during operation, and helping technicians to more realistically evaluate the performance of the test short circuit.

[0011] Specifically, the stretching drive assembly includes a hydraulic cylinder, a pull rod and a pull rod bracket. The pull rod bracket is fixed on the frame. A guide hole is provided on the pull rod bracket. The pull rod passes through the guide hole. One end of the pull rod is connected to the pull plate and the other end is connected to the piston rod of the hydraulic cylinder. The number of pull rods is generally two or more, and all the pull rods are parallel. The hydraulic cylinder applies tensile and compressive loads to the pull plate through the pull rod. If the piston rod of the hydraulic cylinder is fixedly connected to the pull rod, when the parallelism of the piston rod and the pull rod is poor or there is an installation error, the piston rod is easy to get stuck. In order to smoothly transfer the load between the piston rod and the pull rod, the stretching drive assembly also includes a transverse axis and a connecting piece. The transverse axis is connected to the other end of the pull rod, the connecting piece is hinged on the transverse axis, and the connecting piece is connected to the piston rod of the hydraulic cylinder.

[0012] Specifically, the first torsion drive assembly includes a first hydraulic motor and a first planetary reducer, and the first hydraulic motor drives the first main shaft and the test piece to rotate through the first planetary reducer.

[0013] Although the first torsion drive assembly can apply a torsional load to the test piece, the test piece is in a stationary state during the test, which is different from the working state of the drill pipe of the top drive drilling rig (the drill pipe of the top drive drilling rig is in a rotating state when working). In order to more realistically simulate the working load of the drill pipe of the top drive drilling rig, the torsion tensile testing machine of the present invention also includes a second torsion drive assembly, which is connected to the other end of the test piece. The second torsion drive assembly also drives the test piece to rotate. The first torsion drive assembly and the second torsion drive assembly drive the test piece to rotate in the same direction but at different speeds. The speed difference causes the first torsion drive assembly and the second torsion drive assembly to generate a torsional load on the test piece. This design can accurately control the rotation speed and torsional load of the test piece.

[0014] Specifically, the second torsion drive assembly includes a second hydraulic motor, a second planetary reducer and a second main shaft. The second main shaft is connected to the other end of the test piece by an adapted fixture. The second hydraulic motor drives the second main shaft and the test piece to rotate through the second planetary reducer.

[0015] In order to adapt to test pieces of different lengths and to prevent the axial tensile and compressive loads on the first main shaft from being transmitted to the first torsion drive assembly, the frame is provided with guide rails, a movable plate and a slider, the slider is fixed to the bottom surface of the movable plate, the movable plate is mounted on the guide rail through the slider, the guide rail is parallel to the first main shaft, the first torsion drive assembly is mounted on the movable plate, and the entire first torsion drive assembly can translate along the axial direction of the first main shaft.

[0016] Since the torsional load applied by the first torsion drive assembly on the test piece is very large, the moving plate carrying the first torsion assembly will also generate a huge force with the frame, which can easily cause the guide rail to deform, so that the moving plate of the torsion tensile tester cannot slide smoothly after a period of use. In order to overcome this defect, the frame is also provided with a bearing track, which is parallel to the guide rail, and a load slot is provided on the side of the bearing track; a bearing device is provided at the bottom of the moving plate, and the bearing device includes a base, a moving rod, a plug, a first spring, a locking ball, a second spring and an electromagnet; the base is fixed to the bottom of the moving plate, and a horizontal working hole is provided on the base, the bottom of the working hole is bowl-shaped, the locking ball and the first spring are both located in the working hole, the plug closes the working hole, the moving rod passes through the middle of the plug and is inserted into the working hole, the locking ball is distributed around the moving rod, and the first spring squeezes the locking ball to the wedge-shaped area between the moving rod and the inner wall of the working hole; the second spring is installed inside the base, and the second spring aligns the moving rod so that the exposed end of the moving rod is inserted into the load slot; the electromagnet is installed on the plug.

[0017] The locking ball allows the moving rod to move only in one direction in the working hole, that is, the locking ball can achieve one-way locking of the moving rod; when the torsion tensile testing machine is working, the second spring pushes the moving rod so that the exposed end of the moving rod is inserted into the load slot, and the force between the moving plate and the frame is transmitted through the load carrier and the load rail; a rubber pad is arranged between the moving plate and the slider, so that the force between the slider and the guide rail is extremely small, thereby achieving the purpose of protecting the guide rail.

[0018] When the torsion tensile testing machine is finished working, the electromagnet is energized and attracts the locking ball, which translates and compresses the first spring. The locking ball is no longer in close contact with the inner wall of the working hole, so that the locking ball loses its one-way locking effect on the moving rod, and the moving rod can freely retract into the working hole. The exposed end of the moving rod is no longer in close contact with the load slot, ensuring that the load slot will not produce resistance to the translation of the moving plate. Since the moving rod can actively contact the load rail during work, even if the load rail is deformed during use, it will not affect the transmission of force between the load rail and the moving rod.

[0019] Furthermore, a limit plate is provided at the end of the moving rod inserted into the base, and the limit plate is used to limit the extreme position of the translation of the moving rod in the working hole.

[0020] Furthermore, a ball head is provided at the exposed end of the moving rod, and the cross-section of the load slot is trapezoidal, so that the ball head can contact the load slot more easily; on the other hand, when the electromagnet is energized, the ball head can also be attracted by the electromagnet, so that the moving rod actively compresses the second spring and retracts into the working hole.

[0021] Beneficial effects: (1) The torsion tensile testing machine of the present invention integrates the tensile and compressive loads and torsion loads from the tensile drive assembly and the first torsion drive assembly into the first main shaft through a coupler, and uses the first main shaft to simultaneously apply the set static or dynamic tensile and compressive loads and torsion loads to the test short circuit, simulating the various complex forces that the drill pipe of the top drive drilling rig bears during operation, helping technicians to more realistically evaluate the performance of the test short circuit. (2) The torsion tensile testing machine of the present invention is provided with a torsion drive assembly at each end of the test piece, so that the test piece is subjected to torsion loads during rotation, which is closer to the actual working conditions of the drill pipe of the top drive drilling rig and has a better test effect. (3) The torsion tensile testing machine of the present invention uses a hydraulic system to simultaneously apply tensile and compressive loads and torsion loads to the test piece, has a large output load, and can be loaded in combination and dynamically, and has a better simulation experiment effect. (4) The torsion tensile testing machine of the present invention is equipped with a load-bearing device and a load-bearing track at the bottom of the movable plate, so that no huge force is generated between the guide rail and the slider used for translation, thereby avoiding deformation of the guide rail and prolonging the service life of the torsion tensile testing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a perspective view of the torsion tensile testing machine of Example 1.

[0023] Figure 2 1 is a cross-sectional view of the coupler in Example 1.

[0024] Figure 3 It is a three-dimensional diagram of the movable plate and the frame in Example 1.

[0025] Figure 4 It is a front view of the movable plate and the frame in Example 1.

[0026] Figure 5 It is a schematic diagram of the hydraulic system of the hydraulic cylinder in Example 1.

[0027] Figure 6 It is a schematic diagram of the hydraulic system of the two hydraulic motors in Example 1.

[0028] Figure 7 It is a front view of the movable plate and the frame in Example 2.

[0029] Figure 8 yes Figure 7 A enlarged view of .

[0030] Fig. 9 yes Figure 8 Another state of.

[0031] Among them: 100, frame; 110, guide rail; 120, moving plate; 130, slider; 140, bearing track; 141, load slot; 150, load carrier; 151, base; 151-1, working hole; 152, moving rod; 152-1, limit plate; 152-2, ball head; 153, plug; 154, first spring; 155, locking ball; 156, second spring; 157, electromagnet; 160, rubber pad; 200, first spindle; 210, convex plate; 300, coupler; 310, pull plate; 320, bearing; 400, stretching drive assembly; 410, hydraulic cylinder; 420, pull rod; 430, pull rod bracket; 440, horizontal axis; 450, connecting piece; 500, first torsion drive assembly; 510, first hydraulic motor; 520, The first planetary reducer; 600, the second torsion drive assembly; 610, the second hydraulic motor; 620, the second planetary reducer; 630, the second main shaft; 700, the test piece; 801, the first oil filter; 802, the first hydraulic pump; 803, the first overflow valve; 804, the first servo valve; 805, the first non-return valve; 806, the first air cooler; 807, the first stop valve; 808, the first accumulator; 809, the first servo safety valve; 810, the first oil tank; 901, the second oil filter; 902, the second hydraulic pump; 903, the second overflow valve; 904, the second non-return valve; 905, the second servo valve; 906, the second air cooler; 907, the second stop valve; 908, the second accumulator; 909, the second servo safety valve; 910, the second oil tank. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with specific implementation modes.

[0033] Example 1

[0034] like Figure 1 As shown, the torsion tensile testing machine of this embodiment includes a frame 100 , a first spindle 200 , a coupler 300 , a tensile drive assembly 400 , a first torsion drive assembly 500 , and a second torsion drive assembly 600 .

[0035] One end of the test piece 700 is connected to the first spindle 200 through a fixture.

[0036] like Figure 2 As shown, the coupler 300 includes a pull plate 310 and two bearings 320. A cam 210 is provided in the middle of the first main shaft 200. The two bearings 320 are sleeved on the first main shaft 200 and are respectively located on both sides of the cam 210. A bearing hole is provided in the middle of the pull plate 310 and sleeved on the two bearings 320. The coupler 300 is used to integrate tensile and compressive loads and torsional loads.

[0037] The stretching drive assembly 400 includes a hydraulic cylinder 410, a pull rod 420, a pull rod bracket 430, a transverse axis 440 and a connecting piece 450. The pull rod bracket 430 is fixed on the frame 100. A guide hole is provided on the pull rod bracket 430, and the pull rod 420 passes through the guide hole. There are two pull rods 420 and the two pull rods 420 are parallel. One end of the pull rod 420 is connected to the pull plate 310 and the other end is connected to the transverse axis 440. The connecting piece 450 is hinged on the transverse axis 440. The connecting piece 450 is connected to the piston rod of the hydraulic cylinder 410. The hydraulic cylinder 410 applies tensile and compressive loads to the pull plate 310 through the pull rod 420.

[0038] The first torsion drive assembly 500 includes a first hydraulic motor 510 and a first planetary reducer 520. The first hydraulic motor 510 drives the first main shaft 200 and the test piece 700 to rotate through the first planetary reducer 520. The second torsion drive assembly 600 includes a second hydraulic motor 610, a second planetary reducer 620, and a second main shaft 630. The second main shaft 630 is connected to the other end of the test piece 700 by an adapted fixture. The second hydraulic motor 610 drives the second main shaft 630 and the test piece 700 to rotate through the second planetary reducer 620. The first torsion drive assembly 500 and the second torsion drive assembly 600 drive the test piece 700 to rotate in the same direction but at different speeds. The speed difference causes the first torsion drive assembly 500 and the second torsion drive assembly 600 to generate a torsional load on the test piece 700.

[0039] like Figure 3 and Figure 4 As shown, a guide rail 110, a movable plate 120 and a slider 130 are provided on the frame 100. The slider 130 is fixed to the bottom surface of the movable plate 120. The movable plate 120 is installed on the guide rail 110 through the slider 130. The guide rail 110 is parallel to the first main axis 200. The first torsion drive assembly 500 is installed on the movable plate 120. The entire first torsion drive assembly 500 can be translated along the axial direction of the first main axis 200 so as to adapt to test pieces 700 of different lengths.

[0040] When the torsion tensile testing machine of this embodiment is working, the piston rod of the hydraulic cylinder 410 outputs the tensile and compressive loads, and transmits the tensile and compressive loads to the first main shaft 200 and the test piece 700 through the coupler 300. The first torsion drive assembly 500 and the second torsion drive assembly 600 output the torsion load to the test piece 700 through the speed difference between the two, so as to realize the tensile, compression and torsion composite loading test of the test piece 700. The torsion tensile testing machine of this embodiment is mainly used for evaluating the test short circuit in the top drive drilling rig industry. In actual application, the test short circuit is installed in the torsion tensile testing machine of this embodiment as the test piece 700, and the hydraulic cylinder 410, the first hydraulic motor 510 and the second hydraulic motor 610 are controlled by the hydraulic system to output the load. According to the test requirements, the set static or dynamic tensile and compressive loads and torsion loads are applied to the test short circuit, simulating the various complex forces that the drill pipe of the top drive drilling rig is subjected to during operation, so as to help technicians more realistically evaluate the performance of the test short circuit.

[0041] Figure 5 The diagram shows the principle diagram of the hydraulic system of the hydraulic cylinder 410 of the present embodiment. The hydraulic system of the hydraulic cylinder 410 mainly includes a first oil filter 801, a first hydraulic pump 802, a first overflow valve 803, a first servo valve 804, a first check valve 805, a first air cooler 806, a first stop valve 807, a first accumulator 808, a first servo safety valve 809 and a first oil tank 810. The first hydraulic pump 802 is used as the power source of the system. After the working fluid is purified by the first oil filter 801, it is pumped into the first accumulator 808 and the first servo valve 804. Finally, the working fluid enters the hydraulic cylinder 410 to drive the piston to move. The first hydraulic pump 802 controls the flow of the working fluid so that the hydraulic cylinder 410 drives the piston rod to move in accordance with the set motion law, and applies dynamic tension and compression loads to the test piece 700. The hydraulic system of the hydraulic cylinder 410 is also equipped with safety protection elements such as the first overflow valve 803 and the first servo safety valve 809 to ensure the safe operation of the system.

[0042] Figure 6The diagram shows the principle diagram of the hydraulic system of the first hydraulic motor 510 and the second hydraulic motor 610 of this embodiment, which mainly includes a second oil filter 901, a second hydraulic pump 902, a second overflow valve 903, a second check valve 904, a second servo valve 905, a second air cooler 906, a second stop valve 907, a second accumulator 908, a second servo safety valve 909 and a second oil tank 910. The two second hydraulic pumps 902 serve as the power source of the first hydraulic motor 510 and the second hydraulic motor 610 respectively, and inject the working fluid into the second accumulator 908 and the second servo valve 905 after purification by the second oil filter 901. The two second hydraulic pumps 902 accurately control the flow of the working fluid in their respective circuits, so that the first hydraulic motor 510 and the second hydraulic motor 610 output torsional load and speed according to the setting, simulating the composite torque load of the short circuit and the drill rod during the working process. The hydraulic circuit is also equipped with safety protection elements such as a second overflow valve 903 and a second servo safety valve 909 to ensure the safe operation of the system.

[0043] Example 2

[0044] like Figures 7 to 9 As shown, this embodiment is basically the same as the embodiment 1, and the only difference is that: the frame 100 of this embodiment is also provided with a bearing rail 140, the bearing rail 140 is parallel to the guide rail 110, and the side of the bearing rail 140 is provided with a load slot 141 with a trapezoidal cross section. A bearing device 150 is provided at the bottom of the moving plate 120, and the bearing device 150 includes a base 151, a moving rod 152, a plug 153, a first spring 154, a locking ball 155, a second spring 156 and an electromagnet 157; the base 151 is fixed to the bottom of the moving plate 120, and a horizontal working hole 151-1 is provided on the base 151, the bottom of the working hole 151-1 is bowl-shaped, the locking ball 155 and the first spring 154 are both located in the working hole 151-1, and the plug 153 closes the working hole 151-1. Hole 151-1, the moving rod 152 passes through the middle of the plug 153 and is inserted into the working hole 151-1, the locking ball 155 is distributed around the moving rod 152, and the first spring 154 squeezes the locking ball 155 to the wedge-shaped area between the moving rod 152 and the inner wall of the working hole 151-1; the second spring 156 is installed inside the base 151, and the second spring 156 is aligned with the moving rod 152 so that the exposed end of the moving rod 152 is inserted into the load slot 141; the electromagnet 157 is installed on the plug 153.

[0045] The end of the moving rod 152 inserted into the base 151 is provided with a limit plate 152-1, and the limit plate 152-1 is used to limit the extreme position of the translation of the moving rod 152 in the working hole 151-1. The exposed end of the moving rod 152 is provided with a ball head 152-2. A rubber pad 160 is arranged between the moving plate 120 and the slider 130.

[0046] like Figure 7 and Figure 8 As shown, when the torsion tensile testing machine of this embodiment is performing a loading test, the electromagnet 157 is in a power-off state, and the locking ball 155 is squeezed by the first spring 154 to the wedge-shaped area between the moving rod 152 and the inner wall of the working hole 151-1, and the locking ball 155 forms a one-way lock on the moving rod 152, that is, the moving rod 152 can move freely to the left but cannot move to the right. Under the action of the second spring 156, the moving rod 152 moves to the left to the extreme position, and the ball head 152-2 is inserted into the load slot 141, so that the force between the moving plate 120 and the frame 100 is transmitted through the load carrier 150 and the load rail 140; the force between the slider 130 and the guide rail 110 is extremely small, thereby achieving the purpose of protecting the guide rail 110.

[0047] like Fig. 9 As shown, when the torsion tensile testing machine of this embodiment is not performing a loading test, the electromagnet 157 is energized and attracts the locking ball 155, the locking ball 155 translates to the left and compresses the first spring 154, the locking ball 155 is no longer in close contact with the inner wall of the working hole 151-1, so that the locking ball 155 loses the one-way locking effect on the moving rod 152. The ball head 152-2 is attracted by the electromagnet 157 to drive the moving rod 152 to move rightward and retract into the working hole 151-1. At this time, the ball head 152-2 of the moving rod 152 is no longer in close contact with the load slot 141, ensuring that the load slot 141 will not generate resistance to the translation of the moving plate 120. Since the moving rod 152 in this embodiment can actively contact closely with the bearing rail 140 during operation, even if the bearing rail 140 is deformed to a certain extent during use, it will not affect the transmission of the force between the bearing rail 140 and the moving rod 152.

[0048] Although the embodiments of the present invention are described in the specification, these embodiments are only for reference and should not limit the protection scope of the present invention. Various omissions, substitutions and changes within the scope of the present invention should be included in the protection scope of the present invention.

Claims

1. A torsion tensile testing machine, characterized in that: The invention comprises a frame (100), a first main shaft (200), a coupler (300), a tensile drive assembly (400) and a first torsion drive assembly (500); the first main shaft (200) is connected to one end of a test piece (700), and the test piece (700) is mounted on the frame (100); The coupler (300) comprises a pull plate (310) and two bearings (320); a convex disc (210) is provided in the middle of the first main shaft (200); the two bearings (320) are sleeved on the first main shaft (200) and are respectively located on both sides of the convex disc (210); a bearing hole is provided in the middle of the pull plate (310) and sleeved on the two bearings (320); The stretching drive assembly (400) is connected to the pulling plate (310), and the stretching drive assembly (400) applies an axial load to the first main shaft (200) through the pulling plate (310). The first torsion drive assembly (500) drives the first main shaft (200) to rotate.

2. The torsion tensile testing machine according to claim 1, characterized in that: The stretching drive assembly (400) comprises a hydraulic cylinder (410), a pull rod (420) and a pull rod bracket (430); the pull rod bracket (430) is fixed on the frame (100); a guide hole is provided on the pull rod bracket (430); the pull rod (420) passes through the guide hole; one end of the pull rod (420) is connected to the pull plate (310) and the other end is connected to the piston rod of the hydraulic cylinder (410).

3. The torsion tensile testing machine according to claim 2, characterized in that: The stretching drive assembly (400) further comprises a transverse axis (440) and a connecting piece (450), wherein the transverse axis (440) is connected to the other end of the pull rod (420), the connecting piece (450) is hinged on the transverse axis (440), and the connecting piece (450) is connected to the piston rod of the hydraulic cylinder (410).

4. The torsion tensile testing machine according to claim 1, characterized in that: The first torsion drive assembly (500) comprises a first hydraulic motor (510) and a first planetary reducer (520), and the first hydraulic motor (510) drives the first main shaft (200) and the test piece (700) to rotate through the first planetary reducer (520).

5. The torsion tensile testing machine according to claim 4, characterized in that: The invention also includes a second torsion drive assembly (600), which is connected to the other end of the test piece (700). The second torsion drive assembly (600) also drives the test piece (700) to rotate. The first torsion drive assembly (500) and the second torsion drive assembly (600) drive the test piece (700) to rotate in the same direction but at different speeds. The speed difference causes the first torsion drive assembly (500) and the second torsion drive assembly (600) to generate a torsion load on the test piece (700).

6. The torsion tensile testing machine according to claim 5, characterized in that: The second torsion drive assembly (600) includes a second hydraulic motor (610), a second planetary reducer (620) and a second main shaft (630). The second main shaft (630) is connected to the other end of the test piece (700). The second hydraulic motor (610) drives the second main shaft (630) and the test piece (700) to rotate through the second planetary reducer (620).

7. The torsion tensile testing machine according to claim 1, characterized in that: The frame (100) is provided with a guide rail (110), a movable plate (120) and a slider (130); the slider (130) is fixed to the bottom surface of the movable plate (120); the movable plate (120) is mounted on the guide rail (110) via the slider (130); the guide rail (110) is parallel to the first main shaft (200); and the first torsion drive assembly (500) is mounted on the movable plate (120).

8. The torsion tensile testing machine according to claim 7, characterized in that: The frame (100) is also provided with a load-bearing rail (140), the load-bearing rail (140) is parallel to the guide rail (110), and a load slot (141) is provided on the side of the load-bearing rail (140); A carrier (150) is arranged at the bottom of the movable plate (120), and the carrier (150) comprises a base (151), a movable rod (152), a plug (153), a first spring (154), a locking ball (155), a second spring (156) and an electromagnet (157); the base (151) is fixed to the bottom of the movable plate (120), a horizontal working hole (151-1) is arranged on the base (151), the bottom of the working hole (151-1) is bowl-shaped, the locking ball (155) and the first spring (154) are both located in the working hole (151-1), and the plug (153) is closed. The working hole (151-1) is provided with a moving rod (152) passing through the middle of the plug (153) and inserted into the working hole (151-1). The locking balls (155) are distributed around the moving rod (152). The first spring (154) pushes the locking balls (155) toward the wedge-shaped area between the moving rod (152) and the inner wall of the working hole (151-1). The second spring (156) is installed inside the base (151). The second spring (156) is aligned with the moving rod (152) so that the exposed end of the moving rod (152) is inserted into the load slot (141). The electromagnet (157) is installed on the plug (153).

9. The torsion tensile testing machine according to claim 8, characterized in that: The end of the moving rod (152) inserted into the base (151) is provided with a limiting plate (152-1).

10. The torsion tensile testing machine according to claim 9, characterized in that: The exposed end of the moving rod (152) is provided with a ball head (152-2), and the cross section of the load slot (141) is trapezoidal.

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