Bolt combination load testing device and method

Abstract

The invention relates to the technical field of bolt detection, and discloses a bolt combination load testing device and method.The bolt combination load testing device comprises a base, a support is fixed to the base, a torsion detection assembly is arranged in the base, and a tension assembly is installed on the support; the torsion detection assembly comprises a torsion detection block and a worm wheel rotating disc, an auxiliary fastening part and at least two limiting sliding plates are movably arranged in the torsion detection block, and the limiting sliding plates are matched with the worm wheel rotating disc. Under the joint influence of the tension load and the torsion load, the torque performance of the bolt in different tension states can be analyzed by recording the tension and torque data, so that the performance of the bolt under the combined load is evaluated, the stress condition under the actual working condition can be more accurately simulated, and the problem that the bolt cannot be accurately tested during independent detection is effectively avoided. Errors may occur in detection results due to some factors.

Description

Technical Field

[0001] The invention relates to the technical field of bolt detection, and in particular to a testing device and method for bolt combined load. Background Art

[0002] Bolt load refers to the external force that the bolt is subjected to in actual use, including axial tensile load, shear load, torque load, etc. The size and distribution of these loads directly affect the connection performance and reliability of the bolt. The tensile load describes the force applied to the bolt in the axial direction. For example, when the two parts connected by the bolt are subjected to tension along the axis of the bolt, the bolt will be subjected to tensile load. The detection method is to fix the bolt on a tensile testing machine and gradually increase the tension until the bolt breaks. By recording data such as elongation, stress and strain, the yield strength, tensile strength and elongation are calculated. Torque load Torque load refers to the torque applied when tightening the bolt, which is used to ensure the tightening force of the bolt connection. The test method of torque load uses a torque wrench to directly measure the torque applied during the tightening process of the bolt. The preset torque wrench will make a sound or feel feedback when the preset torque value is reached, prompting the operator to stop applying force; the electronic torque wrench has higher accuracy and readability, and can display the torque value in real time and store data.

[0003] Nowadays, independent tests are generally carried out, that is, the torque load or the tensile load is tested separately. However, in actual applications, bolts usually bear different combined loads, and the separate torque test can only reflect the torque condition of the bolt during the tightening process, while the tensile test mainly evaluates the tensile strength and other properties of the bolt. It is impossible to test the combined load at the same time, and it is impossible to ensure that the performance of the bolt matches the actual working conditions. Moreover, the test results of the two cannot be verified with each other, and the test results may cause certain errors in actual applications. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a testing device for bolt combined load, which has the advantages of bolt load combination detection.

[0005] In order to achieve the above bolt load combination detection purpose, the present invention provides the following technical solution: comprising a base, a bracket is fixed on the base, a torque detection component is arranged in the base, and a tension component is installed on the bracket; The torque detection assembly includes a torque detection block and a worm gear rotating disk, wherein an auxiliary fastening part and a limit slide are movably arranged in the torque detection block, wherein at least two limit slides are arranged, and the limit slides cooperate with the worm gear rotating disk; The tension component comprises a tension lead screw, a nut block is threadedly connected to the tension lead screw, and a tension support rod and a tension sensing block are sleeved on the nut block.

[0006] Preferably, the torque detection block is fixed in the base and is T-shaped, with part of it located in the base. A fastening part groove is provided on the upper end surface of the torque detection block, and the auxiliary fastening part is located in the fastening part groove. The middle part of the torque detection block is hollow, and bolts are installed in the hollow space. At least two limiting grooves are also provided in the torque detection block, and the limiting slide slides in the limiting grooves. The worm gear turntable is arranged below the torque detection block and is rotatably connected to the base. The worm gear turntable is also threadedly connected to the end face of the limiting slide.

[0007] Preferably, a limiting screw thread is arranged on the inner end surface of the limiting slide plate, and a connecting rod is hingedly connected between the auxiliary fastening part and the tension support rod.

[0008] Preferably, the connecting rod is arc-shaped and elastic.

[0009] Preferably, a worm is rotatably connected inside the base, the worm extends to the outside, a worm handle is fixed to the outside part, and the worm cooperates with the worm wheel turntable.

[0010] Preferably, the tension screw is rotationally connected to the bracket, a tension handle is fixed to the top of the tension screw, a bearing is installed between the tension handle and the bracket, and the tension support rod and the tension sensing block are both slidably installed on the nut block.

[0011] Preferably, a tension display is also installed on the tension sensing block, and the tension display is located on the same side as the tension handle.

[0012] Preferably, fixing components are further provided on both sides of the base, and the fixing components include a clamping block sliding inside the base, and a mounting screw rod is rotatably connected inside the clamping block, and the mounting screw rod is threadedly connected to the inside of the base.

[0013] Preferably, the card block is L-shaped and divided into a long section and a short section, wherein the mounting screw is installed in the long section of the card block, and a card slot is provided on one end surface of the short section of the card block close to the base, a card shaft is movably connected in the card slot, and the bottom of the card slot is arranged as an inclined surface.

[0014] A method for testing a bolt combined load test device comprises the following steps: S1: First, screw the bolt to be tested onto the test equipment, that is, install the bolt onto the torque detection block to fix the auxiliary fastening parts and the torque detection block, then apply a certain torque to it, record the torque value required to reach the preload force, and then apply torque to the bolt through a torque detection wrench. After the bolt is loosened, record the torque value on the torque detection wrench as a control group; S2: Then continue to tighten the bolt and apply a certain torque to reach the torque value recorded in S, then rotate the tension handle to make the nut block drive the tension support rod and the tension sensing block to a certain extent, and apply tension to the auxiliary fastening parts through the connecting rod. When a certain tension is reached, record the pressure value on the tension display, and then continue to apply torque to the bolt through the torque detection wrench. After the bolt is loosened, record the torque value on the torque detection wrench; S3: Repeat the operation of step S above, continue to rotate the tension handle, apply greater tension to the auxiliary fastening parts, record the pressure value on the tension display and the torque value required to loosen the bolt, and obtain the torque performance of the bolt under different tension states by analyzing the data; S4: After the test, you need to rotate the tension screw and completely loosen the connecting rod so that the tension applied to the auxiliary fastening parts is zero and the bolts are loose. Rotate the worm slightly to move the limit slide outward and open it. At this time, you can directly remove the bolts.

[0015] Compared with the prior art, the present invention provides a bolt combined load testing device, which has the following beneficial effects: 1. The testing device and method for combined load of bolts can test the combined influence of tensile load and torsional load of bolts by setting up the tensile component. By recording the data of tensile force and torque, the torque performance of bolts under different tensile states can be analyzed, so as to evaluate the performance of bolts under combined loads. It can more accurately simulate the stress conditions under actual working conditions and effectively avoid errors in test results due to some factors when testing separately.

[0016] 2. The testing device and method for the combined load of bolts can not only enable the bolts to be installed and fixed normally through the setting of the limit slide, but also enable the limit slide to be simultaneously expanded outward through the worm gear turntable, so that the limit screw thread is separated from the connection with the bolt. At this time, the bolt can be directly removed without the need to reversely twist the bolt for a long time, which greatly reduces the disassembly process of the bolt and achieves the effect of quickly disassembling the bolt.

[0017] 3. The testing device and method of the bolt combination load can, through the setting of the clamping block, screw the installation screw to open the clamping block, and clamp the base on other fixed objects. Through the setting of the clamping shaft, the base can generate a force to disengage under the action of external force, and then the clamping shaft will move to a shallower position in the clamping groove, so as to achieve the purpose of blocking the gap between the clamping block and the base, limit it, prevent the base from disengaging, make it more stable, and will not be displaced during the test, thereby affecting the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2It is a schematic diagram of the internal structure of the present invention; Figure 3 For the present invention Figure 2 A schematic diagram of the enlarged structure at A in the middle; Figure 4 It is a schematic diagram of the internal structure of the present invention; Figure 5 It is a schematic diagram of the structure of the tension component of the present invention; Figure 6 For the present invention Figure 2 Schematic diagram of the enlarged structure at point B in the middle.

[0019] In the figure: 10, base; 101, bracket; 20, tension screw; 201, tension handle; 202, bearing; 203, tension support rod; 204, tension sensor block; 205, nut block; 206, tension display instrument; 30, torque detection block; 301, fastening part slot; 302, auxiliary fastening part; 303, limit slide slot; 304, limit slide plate; 3041, limit screw; 31, bolt; 32, worm wheel turntable; 33, worm; 331, worm handle; 40, connecting rod; 50, torque detection wrench; 60, clamping block; 601, clamping slot; 602, clamping shaft; 61, installation screw. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0021] like Figure 1-6As shown, it includes a base 10, a bracket 101 is fixed on the base 10, a torque detection component is arranged in the base 10, a tension component is installed on the bracket 101, and fixing components are also arranged on both sides of the base 10. The fixing components include a block 60 sliding in the base 10, and the block 60 is internally rotatably connected with a mounting screw 61, and the mounting screw 61 is threadedly connected to the inside of the base 10. The block 60 is L-shaped and divided into a long section and a short section, wherein the mounting screw 61 is installed in the long section of the block 60, and a slot 601 is provided on the end surface of one side of the short section of the block 60 close to the base 10, and the slot 601 is movable The movable connection is provided with a clamping shaft 602, and the bottom of the clamping groove 601 is set as an inclined surface. Through the setting of the clamping block 60, the screw rod 61 can be screwed to open the clamping block 60, and the base 10 can be clamped on other fixed objects, such as the edge of a table. Through the setting of the clamping shaft 602, the base 10 can generate a force to be disengaged under the action of an external force, and then the clamping shaft 602 will move to a shallower position of the clamping groove 601, thereby achieving the purpose of blocking the gap between the clamping block 60 and the base 10, limiting it, preventing the base 10 from disengaging, making it more stably installed, and will not generate displacement during the test, thereby affecting the test results.

[0022] The torque detection assembly includes a torque detection block 30 and a worm gear turntable 32, wherein the torque detection block 30 is movably provided with an auxiliary fastening part 302 and a limiting slide 304, wherein at least two limiting slides 304 are provided, and the limiting slides 304 cooperate with the worm gear turntable 32, and a worm 33 is also rotatably connected in the base 10, and the worm 33 extends to the outside, and a worm handle 331 is fixed to its outside part, and the worm 33 cooperates with the worm gear turntable 32, wherein teeth are provided on the outer peripheral side of the worm gear turntable 32, and are connected with the threaded teeth of the worm 33 (worm gear connection) to achieve a self-locking effect, which can be used to limit the moving position of the limiting slide 304, and since the limiting slide 304 only needs to move the width of one screw thread, the worm handle 331 only needs to move a small amplitude to complete the disassembly of the bolt 31.

[0023] The torque detection block 30 is fixed in the base 10 and is T-shaped. Part of the torque detection block 30 is located in the base 10. The cross bar of the T-shape is arranged parallel to the bracket 101. The upper end surface of the torque detection block 30 is provided with a fastening part groove 301. The auxiliary fastening part 302 is located in the fastening part groove 301. The middle part of the torque detection block 30 is hollow, and a bolt 31 is installed in the hollow part. At least two limit slide grooves 303 are also provided in the torque detection block 30. The limit slide plate 30 The worm wheel disc 32 slides in the limiting slide groove 303. The worm wheel disc 32 is arranged below the torque detection block 30 and is rotatably connected to the base 10. The worm wheel disc 32 is also threadedly connected to the end face of the limiting slide plate 304. The inner end face of the limiting slide plate 304 is provided with limiting screw teeth 3041. All the limiting screw teeth 3041 cooperate together to form a thread tooth and match the thread tooth of the bolt 31. The limiting slide plate 304 moves to the point where the limiting screw teeth 3041 are located in the hollow of the torque detection block 30. The bolt 31 can be screwed normally at this time. Since the force generated by the bolt 31 during the tightening process is vertically upward, the limiting slide plate 304 will not be opened outward during the screwing process of the bolt 31, thereby causing the bolt 31 to be unable to be screwed and fixed. Therefore, through the setting of the limiting slide plate 304, not only can the bolt 31 be installed and fixed normally, but the limiting slide plate 304 can also be expanded outward at the same time through the worm gear turntable 32, so that the limiting screw thread 3041 is separated from the bolt 31. At this time, the bolt 31 can be directly removed without the need to reversely twist the bolt 31 for a long time, so that the disassembly process of the bolt 31 is greatly reduced, and the effect of quickly disassembling the bolt 31 is achieved. A connecting rod 40 is hinged between the auxiliary fastening part 302 and the tension support rod 203. The connecting rod 40 is arranged in an arc shape and has elasticity. The setting that the elasticity is relatively easy to deform allows it to control its tension over a longer stroke, so that the purpose of more precise control of the tension can be achieved.

[0024] The tension assembly includes a tension screw 20, a nut block 205 is threadedly connected to the tension screw 20, a tension support rod 203 and a tension sensing block 204 are mounted on the nut block 205, the tension screw 20 is rotatably connected to the bracket 101, a tension handle 201 is fixed to the top of the tension screw 20, a bearing 202 is installed between the tension handle 201 and the bracket 101, the tension support rod 203 and the tension sensing block 204 are both slidably installed on the nut block 205, and a tension display 206 is also installed on the tension sensing block 204, and the tension display 206 and the tension handle 201 are on the same side, wherein the tension support rod 203 and the tension sensing block 204 can only slide on the nut block 205, so the tension screw 20 rotates. Due to the restriction of the connecting rod 40, the tension support rod 203 will not rotate, so the nut block 205 will not rotate either. The tension screw 20 can drive the nut block 205 to move up and down, and the tension sensing block 204 can sense the pressure generated on the tension support rod 203, and then feed it back to the tension display 206. Through the setting of the tension component, the bolt can be tested under the combined influence of tension load and torsional load. By recording the tension and torque data, the torque performance of the bolt under different tensile states can be analyzed, so as to evaluate the performance of the bolt under combined load, which can more accurately simulate the stress conditions under actual working conditions and effectively avoid errors in the test results due to some factors during separate testing.

[0025] Working principle: When in use, first open the block 60 and clamp it on the desktop, then put the bolt 31 into the torque detection block 30, and then tighten the bolt 31 to fix the auxiliary fastening part 302 on the torque detection block 30, and then apply a certain pre-tightening force to the bolt 31, and then rotate the tension handle 201 to rotate the tension screw 20, so that the nut block 205 moves upward to a certain extent through the thread, and the upward movement of the nut block 205 can drive the tension sensing block 204 and the tension support rod 203 to move upward synchronously, and the connecting rod 40 can be pulled by the tension support rod 203 to provide a certain tension to the auxiliary fastening part 302, and then this tension will cause the auxiliary fastening part 302 to stretch the bolt 31, simulating the bolt In the case where bolt 31 is stretched, the tension is also applied to the tension sensing block 204 through the connecting rod 40, and then the current tension value can be checked through the tension display 206. The torque detection wrench 50 is put on the bolt 31 to loosen it. When the bolt 31 is loosened, the torque value under the current tension can be recorded on the torque detection wrench 50, and then the operation is repeated. The torque generated by different tensions can be compared, and the performance of the bolt under tension and torque can be evaluated at the same time. It can more accurately simulate the stress conditions under actual working conditions. During the design and assembly process, the appropriate tensile load and torsional load can be effectively selected according to the specific application scenario and material properties, and regular inspection and maintenance can be carried out.

[0026] After the test is completed, the tension handle 201 is rotated in the opposite direction so that the tension screw 20 drives the nut block 205 to move downward, and the tension generated by the connecting rod 40 gradually disappears. In addition, since the bolt 31 was loosened during the last test, the current bolt 31 is in a loose state. Then, the worm 33 is rotated by the worm handle 331 to rotate the worm wheel turntable 32, which can drive the limiting slide plate 304 to move away from one side of the bolt 31 at the same time, so that the limiting screw 3041 on it is disengaged from the threaded teeth on the limiting bolt 31. At this time, the bolt 31 can be directly removed without repeatedly twisting the bolt 31, thereby achieving the purpose of quickly removing the bolt 31. Example 2

[0027] A method for testing a bolt combined load test device comprises the following steps: S1: First, screw the bolt to be tested onto the test equipment, that is, install the bolt 31 onto the torque detection block 30 to fix the auxiliary fastening part 302 and the torque detection block 30, then apply a certain torque to it, record the torque value required to reach the pre-tightening force, and then apply torque to the bolt 31 through the torque detection wrench 50, and record the torque value on the torque detection wrench 50 after the bolt is loosened, as a control group; S2: Then continue to screw the bolt 31, apply a certain torque to make it reach the torque value recorded in S1, then rotate the tension handle 201, so that the nut block 205 drives the tension support rod 203 and the tension sensing block 204 to be fixed as a whole, apply tension to the auxiliary fastening part 302 through the connecting rod 40, and when a certain tension is reached, record the pressure value on the tension display 206, and then continue to apply torque to the bolt 31 through the torque detection wrench 50, and record the torque value on the torque detection wrench 50 after the bolt is loosened; S3: Repeat the operation of step S2 above, continue to rotate the tension handle 201, apply a greater tension to the auxiliary fastening part 302, record the pressure value on the tension display 206 and the torque value required to loosen the bolt, and obtain the torque performance of the bolt under different tension states by analyzing the data; S4: After the test is finished, it is necessary to rotate the tension screw 20 and completely loosen the connecting rod 40 so that the tension applied to the auxiliary fastening part 302 is zero and the bolt 31 is in a loose state. By rotating the worm 33 slightly, the limiting slide plate 304 can be moved outward and opened, and the bolt 31 can be directly taken out at this time.

[0028] The torque of a bolt is closely related to the tension. When tightening a bolt, the torque applied is mainly used to overcome the friction of the thread pair and the friction between the nut and the supporting surface of the connected part, thereby generating a preload (tension).

[0029] Basic formula The relationship between torque T and tension F can be expressed by the following formula: T=K×F×d.

[0030] Where T is the torque, measured in Newton meters (N·m).

[0031] F is the tension (preload) in Newtons (N).

[0032] d is the nominal diameter of the thread in meters (m).

[0033] K is the tightening force coefficient Through calculation, we can understand the different changes of torque under the action of external tension, so the torque test alone can only reflect the torque of the bolt during the tightening process, while the tensile test mainly evaluates the tensile strength and other properties of the bolt. Performing these two tests at the same time can fully understand the performance of the bolt under different stress states, including its preload during the tightening process, strength and plasticity under tensile load, etc., so as to more accurately evaluate the comprehensive performance of the bolt.

[0034] In summary, the testing device and method for combined load of bolts can test the combined influence of tensile load and torsional load of bolts by setting the tensile component, and can analyze the torque performance of bolts under different tensile states by recording the data of tensile force and torque, so as to evaluate the performance of bolts under combined load, and can more accurately simulate the stress conditions under actual working conditions, and effectively avoid errors in the test results due to some factors when testing separately; therefore, by setting the limiting slide plate 304, not only the bolt 31 can be installed and fixed normally, but also the limiting slide plate 304 can be simultaneously expanded outward by the worm gear turntable 32, so that the limiting screw 3041 is separated from the connection with the bolt 31, At this time, the bolt 31 can be directly removed without the need to reversely twist the bolt 31 for a long time, which greatly reduces the disassembly process of the bolt 31 and achieves the effect of quickly disassembling the bolt 31; through the setting of the clamping block 60, the screw rod 61 can be screwed to open the clamping block 60, and the base 10 can be clamped on other fixed objects. Through the setting of the clamping shaft 602, the base 10 can generate a force to disengage under the action of external force, and then the clamping shaft 602 will move to a shallower position of the clamping groove 601, thereby achieving the purpose of blocking the gap between the clamping block 60 and the base 10, limiting it, preventing the base 10 from disengaging, making it more stably installed, and will not cause displacement during the test, thereby affecting the test results.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bolt combination load testing device, comprising a base (10), a bracket (101) being fixed on the base (10), characterized in that: A torque detection component is arranged in the base (10), and a tension component is installed on the bracket (101); The torque detection assembly comprises a torque detection block (30) and a worm wheel rotating disk (32), wherein an auxiliary fastening part (302) and a limit slide plate (304) are movably arranged in the torque detection block (30), wherein at least two limit slide plates (304) are arranged, and the limit slide plates (304) cooperate with the worm wheel rotating disk (32); The tension component comprises a tension lead screw (20), a nut block (205) is threadedly connected to the tension lead screw (20), and a tension support rod (203) and a tension sensing block (204) are sleeved on the nut block (205).

2. A bolt combination load testing device according to claim 1, characterized in that: The torque detection block (30) is fixed in the base (10) and is arranged in a T-shape, with part of it being located in the base (10). A fastening part groove (301) is provided on the upper end surface of the torque detection block (30), and the auxiliary fastening part (302) is located in the fastening part groove (301). The middle part of the torque detection block (30) is hollow, and a bolt (31) is installed in the hollow part. At least two limiting sliding grooves (303) are also provided in the torque detection block (30), and the limiting slide plate (304) slides in the limiting sliding grooves (303). The worm wheel rotating disk (32) is arranged below the torque detection block (30) and is rotatably connected to the base (10). The worm wheel rotating disk (32) is also threadedly connected to the end surface of the limiting slide plate (304).

3. A bolt combination load testing device according to claim 2, characterized in that: A limiting screw thread (3041) is provided on the inner end surface of the limiting slide plate (304), and a connecting rod (40) is hingedly connected between the auxiliary fastening part (302) and the tension support rod (203).

4. A bolt combination load testing device according to claim 3, characterized in that: The connecting rod (40) is arranged in an arc shape and has elasticity.

5. The bolt combination load testing device according to claim 1, characterized in that: A worm (33) is also rotatably connected inside the base (10), and the worm (33) extends to the outside, a worm handle (331) is fixed to the outside portion thereof, and the worm (33) cooperates with the worm wheel rotating disc (32).

6. The bolt combination load testing device according to claim 1, characterized in that: The tension screw (20) is rotatably connected to the bracket (101), a tension handle (201) is fixed to the top of the tension screw (20), a bearing (202) is installed between the tension handle (201) and the bracket (101), and the tension support rod (203) and the tension sensing block (204) are both slidably installed on the nut block (205).

7. A bolt combination load testing device according to claim 6, characterized in that: A tension display (206) is also installed on the tension sensing block (204), and the tension display (206) is located on the same side as the tension handle (201).

8. The bolt combination load testing device according to claim 1, characterized in that: A fixing assembly is also provided on both sides of the base (10), the fixing assembly comprising a clamping block (60) sliding inside the base (10), a mounting screw rod (61) rotatably connected inside the clamping block (60), and the mounting screw rod (61) is threadedly connected to the inside of the base (10).

9. A bolt combination load testing device according to claim 8, characterized in that: The clamping block (60) is L-shaped and is divided into a long section and a short section, wherein the mounting screw rod (61) is mounted in the long section of the clamping block (60), and a clamping groove (601) is provided on an end surface of one side of the short section of the clamping block (60) close to the base (10), a clamping shaft (602) is movably connected in the clamping groove (601), and the bottom of the clamping groove (601) is arranged as an inclined surface.

10. A method for testing a bolt combination load test device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: firstly, the bolt to be tested is screwed onto the test equipment, that is, the bolt (31) is installed on the torque detection block (30) to fix the auxiliary fastening part (302) and the torque detection block (30), and then a certain torque is applied thereto, and the torque value required to reach the pre-tightening force is recorded. Then, a torque is applied to the bolt (31) by a torque detection wrench (50), and the torque value on the torque detection wrench (50) is recorded after the bolt is loosened, as a control group; S2: Then continue to tighten the bolt (31) and apply a certain torque to reach the torque value recorded in S (1), then rotate the tension handle (201) so that the nut block (205) drives the tension support rod (203) and the tension sensing block (204) to be fixed as a whole, apply tension to the auxiliary fastening part (302) through the connecting rod (40), and when a certain tension is reached, record the pressure value on the tension display (206), and then continue to apply torque to the bolt (31) through the torque detection wrench (50), and record the torque value on the torque detection wrench (50) after the bolt is loosened; S3: Repeat the operation of step S2 above, continue to rotate the tension handle (201), apply a greater tension to the auxiliary fastening part (302), record the pressure value on the tension display (206) and the torque value required to loosen the bolt, and obtain the torque performance of the bolt under different tension states by analyzing the data; S4: After the test is finished, it is necessary to rotate the tension screw (20) and completely loosen the connecting rod (40) so that the tension applied to the auxiliary fastening part (302) is zero and the bolt (31) is in a loose state. By rotating the worm (33) slightly, the limit slide plate (304) can be moved outward and opened, and the bolt (31) can be directly removed.

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