A bolt tensile test fixture and a tensile test machine

Abstract

The utility model belongs to the technical field of bolt tensile test, and discloses a bolt tensile test fixture and a tensile testing machine, a bolt tensile test fixture, including a pressure block, a positioning block, an upper test block, a lower test block and a clamping assembly; the positioning blocks are respectively arranged on the end faces of the two pressure blocks close to each other; the upper test block is provided with a first positioning hole, and the lower test block is provided with a second positioning hole, the two pressure blocks are respectively plugged with the upper test block and the lower test block, and the first positioning hole and the second positioning hole are staggered along the circumference of the pressure block; the clamping assembly is connected to the upper test block and the lower test block; the upper test block, the lower test block, and the clamping assembly are all arranged between the two pressure blocks. In this way, the positioning block can facilitate the connection between the pressure block and the upper test block or the lower test block, thereby locating the force application position of the upper test block and the lower test block, and improving the accuracy and stability of the test.

Description

Technical Field

[0001] The utility model relates to the technical field of bolt tensile testing, in particular to a bolt tensile testing fixture and a tensile testing machine. Background Art

[0002] With the development of the aerospace industry, aerospace fasteners, as key components of the innovative industry, are indispensable for safety and reliability verification. Therefore, a series of verification tests need to be designed for the mechanical properties of fasteners. Bolts are a commonly used fastener. In order to test the tensile properties of bolts, tensile tests are usually required for bolts.

[0003] The tensile testing machine includes a square clamp, a placing part and a stretching part. Two square clamps are provided. The bolts pass through the two square clamps and are clamped respectively, so that the head and the screw of the bolt are respectively located on the side of the two square clamps away from each other. The two square clamps are placed between two four-foot pressure heads arranged opposite to each other, so that the stretching part and the placing part respectively apply forces in opposite directions to the two square clamps through the two four-foot pressure heads, thereby stretching the head and the screw of the bolt. When the bolt breaks, the current force value is recorded to complete the tensile test of the bolt.

[0004] Since the four-legged pressure head acts on the four corners of the square fixture respectively, the square fixture may be damaged and scrapped due to excessive load on the corners. In addition, it is difficult to position the four-legged pressure head when it abuts the square fixture. When performing multiple tests, the abutment position may shift, affecting the test accuracy and stability. Utility Model Content

[0005] The utility model aims to provide a bolt tensile test fixture and a tensile test machine to solve the problems of inaccurate positioning of the bolt tensile test fixture and excessive local load.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] In one aspect, a bolt tensile test fixture comprises:

[0008] Two pressing blocks, the two pressing blocks are coaxially arranged along the stretching direction;

[0009] At least two positioning blocks, the positioning blocks are respectively arranged on the end surfaces of the two pressing blocks close to each other;

[0010] An upper test block and a lower test block, wherein the upper test block is provided with a first positioning hole corresponding to the positioning block, and the lower test block is provided with a second positioning hole corresponding to the positioning block, and the two pressing blocks are respectively plugged with the upper test block and the lower test block through the positioning blocks, and when the upper test block is connected with the lower test block, the first positioning hole and the second positioning hole are staggered along the circumference of the pressing block;

[0011] A clamping assembly, the clamping assembly is connected to both the upper test block and the lower test block, and is used to limit the position of the bolt to be tested on the upper test block and the lower test block;

[0012] The upper test block, the lower test block, and the clamping assembly are all arranged between the two pressing blocks, and are coaxially arranged with the pressing blocks along the stretching direction.

[0013] Preferably, the pressing block is provided with a through hole, and the axis of the through hole coincides with the axis of the pressing block along the stretching direction.

[0014] Preferably, each of the pressing blocks is connected to four positioning blocks, and the four positioning blocks on the same pressing block are arranged at intervals along the circumference of the pressing block.

[0015] Preferably, the lower test block is provided with a limit block, and the upper test block is provided with a limit slot corresponding to the position of the limit block, so that the upper test block is engaged with the lower test block.

[0016] Preferably, a plurality of the limit blocks are provided, and the plurality of limit blocks are spaced apart along the circumference of the lower test block, and one end of the limit block is flush with the outer edge of the lower test block.

[0017] Preferably, the second positioning hole is formed on the limiting block, and one second positioning hole is formed on one limiting block.

[0018] Preferably, the clamping assembly comprises an upper clamping block and a lower clamping block, and the upper clamping block and the lower clamping block are respectively arranged on a side of the upper test block and the lower test block away from each other, for clamping the bolt to be tested.

[0019] Preferably, the clamping assembly further comprises a limiting sleeve, which is arranged on a side of the lower clamping block away from the lower testing block and is threadedly connected to the bolt to be tested.

[0020] Preferably, a positioning groove is formed on a side of the upper clamping block facing away from the upper testing block, and the shape of the positioning groove is adapted to the shape of the head of the bolt to be tested.

[0021] On the other hand, a tensile testing machine includes a testing machine body and the bolt tensile testing fixture as described above, wherein the testing machine body includes a placing portion and a tensile portion, wherein the tensile portion and the placing portion are slidably connected in a direction approaching or moving away from each other, and the bolt tensile testing fixture can be selectively arranged between the tensile portion and the placing portion.

[0022] Beneficial effects of the utility model:

[0023] A bolt tensile test fixture, comprising: two pressing blocks, the two pressing blocks are coaxially arranged along the tensile direction; at least two positioning blocks, the positioning blocks are respectively arranged on the end faces of the two pressing blocks close to each other; an upper test block and a lower test block, the upper test block is provided with a first positioning hole corresponding to the positioning block, and the lower test block is provided with a second positioning hole corresponding to the positioning block, the two pressing blocks are respectively plugged with the upper test block and the lower test block through the positioning blocks, when the upper test block is connected with the lower test block, the first positioning hole and the second positioning hole are staggered along the circumference of the pressing block; a clamping assembly, the clamping assembly is connected to both the upper test block and the lower test block, and is used to limit the position of the bolt to be tested on the upper test block and the lower test block; the upper test block, the lower test block and the clamping assembly are all arranged between the two pressing blocks, and are coaxially arranged with the pressing blocks along the tensile direction.

[0024] In this way, the positioning block applies opposite forces to the lower test block or the upper test block through the first positioning hole or the second positioning hole, so that the head and the screw of the bolt to be tested can be subjected to forces in opposite directions respectively, and the upper test block and the lower test block can bear a larger force, thereby avoiding damage and scrapping due to local excessive load, thereby affecting the stability and accuracy of the bolt tensile test; the clamping assembly can limit the position of the bolt to be tested, and by connecting the pressure block with the upper test block or the lower test block through the positioning block, the force application position of the upper test block or the lower test block can be located, thereby reducing test variables and further improving the accuracy of the bolt tensile test. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a bolt tensile test fixture in one embodiment of the utility model;

[0026] Figure 2 It is an exploded view of a bolt tensile test fixture in one embodiment of the utility model;

[0027] Figure 3 It is a cross-sectional view of a bolt tensile test fixture in one embodiment of the utility model.

[0028] In the figure:

[0029] 1. Bolt to be tested; 2. Press block; 21. Through hole; 3. Positioning block; 4. Upper test block; 41. First positioning hole; 42. Limiting groove; 5. Lower test block; 51. Second positioning hole; 52. Limiting block; 6. Clamping assembly; 61. Upper clamping block; 611. Positioning groove; 62. Lower clamping block; 63. Limiting sleeve. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] See also Figure 1 and Figure 2The utility model provides a bolt tensile test fixture, comprising: two pressing blocks 2, at least two positioning blocks 3, an upper test block 4, a lower test block 5 and a clamping assembly 6, the two pressing blocks 2 are coaxially arranged along the tensile direction; the positioning blocks 3 are respectively arranged on the end faces of the two pressing blocks 2 close to each other; the upper test block 4 is provided with a first positioning hole 41 corresponding to the positioning block 3, and the lower test block 5 is provided with a second positioning hole 51 corresponding to the positioning block 3, the two pressing blocks 2 are respectively plugged with the upper test block 4 and the lower test block 5 through the positioning block 3, when the upper test block 4 is connected with the lower test block 5, the first positioning hole 41 and the second positioning hole 51 are staggered along the circumferential direction of the pressing block 2; the clamping assembly 6 is connected with the upper test block 4 and the lower test block 5, and is used to limit the position of the bolt 1 to be tested on the upper test block 4 and the lower test block 5; the upper test block 4, the lower test block 5, and the clamping assembly 6 are all arranged between the two pressing blocks 2, and are coaxially arranged with the pressing blocks 2 along the tensile direction.

[0035] Among them, the stretching direction is perpendicular to the end face of the pressing block 2, the length direction of the positioning block 3 is parallel to the stretching direction, the number of positioning blocks 3 connected to the two pressing blocks 2 is the same, and the shapes of the first positioning hole 41 and the second positioning hole 51 are both adapted to the positioning blocks 3; the upper test block 4 and the lower test block 5 are columnar structures with the same diameter, and the bolt 1 to be tested is slidably connected to the upper test block 4 and the lower test block 5 respectively.

[0036] It should be noted that, when the positioning block 3 connected to the pressure block 2 located above the upper test block 4 is inserted into the first positioning hole 41, the positioning block 3 abuts against one end of the lower test block 5 facing the upper test block 4, and when the positioning block 3 connected to the pressure block 2 located below the lower test block 5 is inserted into the second positioning hole 51, the positioning block 3 abuts against one end of the upper test block 4 facing the lower test block 5, so that the end faces of the two pressure blocks 2 facing away from the positioning block 3 are respectively subjected to forces toward the bolt 1 to be tested, and the positioning blocks 3 connected to the two pressure blocks 2 respectively apply opposite forces to the upper test block 4 and the lower test block 5, so that the head and the screw of the bolt are subjected to opposite forces, thereby achieving stretching of the bolt.

[0037] In this way, compared with applying the force to the corners of the square clamp, by staggering the first positioning hole 41 and the second positioning hole 51, the positioning block 3 applies a force to the upper test block 4 and the lower test block 5 respectively, which can disperse the load on the upper test block 4 and the lower test block 5 when the bolt 1 to be tested is stretched, and avoid the upper test block 4 and the lower test block 5 from being damaged and scrapped due to excessive local load, thereby enhancing the stability of the bolt pulling test; and the clamping assembly 6 can fix the bolt 1 to be tested on the upper test block 4 and the lower test block 5, and insert the positioning block 3 into the first positioning hole 41 and the second positioning hole 51 respectively, so as to quickly connect the pressing block 2 with the upper test block 4 and the lower test block 5, and ensure that the positioning block 3 can apply a force to the same position of the upper test block 4 or the lower test block 5 in each test, thereby improving the accuracy and stability of the bolt tensile test.

[0038] See also Figure 2 In some embodiments, the pressing block 2 is provided with a through hole 21, and the axis of the through hole 21 coincides with the axis of the pressing block 2 along the stretching direction. Furthermore, the diameter of the through hole 21 is greater than the maximum diameter of the bolt 1 to be tested.

[0039] In this way, when the tensile force applied to the bolt 1 to be tested exceeds its bearing capacity, the bolt 1 to be tested may break, and the through hole 21 can provide an accommodating space for the movement of the bolt 1 to be tested, thereby preventing the normal progress of the test from being affected by the collision between the bolt 1 to be tested and the pressure block 2, and when the pressure block 2 is subjected to the force applied by the tensile testing machine, the force can be stably transmitted to the upper test block 4 or the lower test block 5 through the positioning block 3.

[0040] See also Figure 2 In some embodiments, each pressing block 2 is connected to four positioning blocks 3, and the four positioning blocks 3 on the same pressing block 2 are arranged at intervals along the circumference of the pressing block 2. Furthermore, the four positioning blocks 3 on the same pressing block 2 are arranged at equal intervals.

[0041] In this way, the positioning blocks 3 arranged at equal intervals abut against the end faces of the upper test block 4 or the lower test block 5, which can make the upper test block 4 or the lower test block 5 more balanced when subjected to force, reduce local loads, extend the service life of the upper test block 4 and the lower test block 5, and improve the stability and accuracy of the bolt tension test.

[0042] It is understandable that the number and setting positions of the positioning blocks 3 can be adjusted according to actual needs, and it is sufficient to apply opposite forces to the upper test block 4 and the lower test block 5 to stretch the head and screw of the bolt. No more examples are given here.

[0043] See also Figure 1 and Figure 2 In some embodiments, the lower test block 5 is provided with a limit block 52, and the upper test block 4 is provided with a limit groove 42 at a position corresponding to the limit block 52, so that the upper test block 4 is engaged with the lower test block 5. In this embodiment, the cross section of the limit block 52 is trapezoidal, and the width of the end of the limit block 52 facing the center of the lower test block 5 is smaller than the width of the end away from the center of the lower test block 5. The height of the limit block 52 is the same as the height of the limit groove 42, so that the upper test block 4 and the lower test block 5 can be closely abutted.

[0044] In this way, when a tensile test is required, the limit block 52 is inserted into the limit groove 42, which can facilitate the staff to quickly position and clamp the upper test block 4 and the lower test block 5, thereby improving the efficiency of assembling the bolt tensile test fixture. During the tensile test, since the limit block 52 is clamped with the limit groove 42, the relative position of the upper test block 4 and the lower test block 5 can be prevented from being offset due to the force acting along the tensile direction.

[0045] It is understandable that the cross-section of the limit block 52 may also be a rectangle, a triangle, or other shapes, and is not limited to a trapezoid. The shape and size of the limit block 52 may be adjusted according to actual needs, and will not be listed in detail here.

[0046] See also Figure 2 In some embodiments, a plurality of limit blocks 52 are provided, and the plurality of limit blocks 52 are arranged at intervals along the circumference of the lower test block 5, and one end of the limit block 52 is flush with the outer edge of the lower test block 5. In this embodiment, four limit blocks 52 are provided, and four limit slots 42 are correspondingly provided.

[0047] In this way, multiple limit blocks 52 cooperate with the limit grooves 42 to enable the upper test block 4 and the lower test block 5 to be stably engaged, and it is not easy for the test results to be affected by force displacement. The end face of the limit block 52 is flush with the outer edge of the lower test block 5, which is convenient for observing whether the upper test block 4 and the lower test block 5 are engaged in place.

[0048] It is understandable that the number of the limiting blocks 52 can be adjusted according to actual needs, which will not be elaborated here.

[0049] See also Figure 2 and Figure 3 In some embodiments, the second positioning hole 51 is formed on the limiting block 52 , and one second positioning hole 51 is formed on one limiting block 52 .

[0050] In this way, the second positioning hole 51 is opened on the limit block 52, so that the space on the top surface of the lower test block 5 is more compact, and enough space can be reserved for the positioning block 3 to abut against the lower test block 5. When the upper test block 4 and the lower test block 5 are buckled, the positioning block 3 is inserted into the first positioning hole 41 and the second positioning hole 51 respectively to apply opposite forces to the end faces of the upper test block 4 and the lower test block 5, thereby improving the positioning efficiency and test stability.

[0051] See also Figure 2 In some embodiments, the clamping assembly 6 includes an upper clamping block 61 and a lower clamping block 62. The upper clamping block 61 and the lower clamping block 62 are respectively arranged on a side away from the upper test block 4 and the lower test block 5, and are used to clamp the bolt 1 to be tested.

[0052] In this embodiment, the upper clamping block 61 and the lower clamping block 62 are both rectangular parallelepipeds, and the cross-sectional area of ​​the upper clamping block 61 is smaller than that of the lower clamping block 62 . The bolt 1 to be tested is slidably connected to the upper clamping block 61 and the lower clamping block 62 respectively.

[0053] In this way, the bolt 1 to be tested is passed through the upper test block 4 and the lower test block 5 in the engaged state, and the upper clamping block 61 and the lower clamping block 62 are respectively mounted on the head of the bolt 1 to be tested and the end of the screw away from the head, which can limit the relative position of the bolt 1 to be tested and the upper test block 4 and the lower test block 5, so that the bolt 1 to be tested is subjected to the opposite forces applied by the upper test block 4 and the lower test block 5, thereby improving the stability and accuracy of the bolt tensile test.

[0054] It can be understood that the lower clamping block 62 can be threadedly connected to the bolt 1 to be tested, so that the upper clamping block 61 and the lower clamping block 62 can jointly fix the bolt 1 to be tested on the buckled upper test block 4 and the lower test block 5. The cross-sectional area of ​​the lower clamping block 62 can also be larger than the cross-sectional area of ​​the through hole 21, so that the lower clamping block 62 abuts against the pressing block 2 to achieve the clamping effect on the bolt 1 to be tested. Similarly, the upper clamping block 61 can also be connected to the bolt 1 to be tested. The shapes of the upper clamping block 61 and the lower clamping block 62 and the connection relationship with the bolt 1 to be tested can be adjusted according to actual needs, and can achieve the clamping and limiting of the bolt 1 to be tested. No more examples are given here.

[0055] See also Figure 2 In some embodiments, the clamping assembly 6 further includes a limiting sleeve 63, which is disposed on a side of the lower clamping block 62 away from the lower test block 5 and is threadedly connected to the bolt to be tested 1. The limiting sleeve 63 is coaxially disposed with the lower test block 5 along the tensile direction.

[0056] It should be noted that after the bolt 1 to be tested passes through the upper clamping block 61, the upper test block 4, the lower test block 5, and the lower clamping block 62 in sequence, the limiting sleeve 63 is installed on the screw of the bolt 1 to be tested, and the limiting sleeve 63 is screwed until one end of the limiting sleeve 63 toward the lower clamping block 62 abuts against the lower clamping block 62, thereby limiting the bolt 1 to be tested.

[0057] In this way, the upper clamping block 61, the lower clamping block 62 and the limiting sleeve 63 of corresponding specifications can be replaced according to the specifications of the bolt 1 to be tested, so that the bolt tensile test fixture can perform tensile tests on bolts of different specifications; the limiting sleeve 63 can further limit the position of the bolt 1 to be tested, thereby avoiding the loosening of the bolt 1 to be tested during the tensile test and affecting the test results, thereby improving the accuracy and stability of the bolt tensile test.

[0058] It is understandable that the specifications and shapes of the upper clamping block 61 , the lower clamping block 62 , and the limiting sleeve 63 can be adjusted according to actual needs, and are not listed in detail here.

[0059] See also Figure 2In some embodiments, a positioning groove 611 is provided on the side of the upper clamping block 61 away from the upper test block 4, and the shape of the positioning groove 611 is adapted to the shape of the head of the bolt 1 to be tested. The longitudinal section of the positioning groove 611 is in the shape of a boss.

[0060] In this way, after the bolt 1 to be tested passes through the upper clamping block 61, the head of the bolt 1 to be tested can be engaged with the positioning groove 611, which is convenient for further limiting the position of the bolt 1 to be tested, making the force on the bolt 1 to be tested more stable when being stretched, thereby improving the accuracy of the bolt tension test.

[0061] See also Figure 1 The utility model also provides a tensile testing machine (not shown in the figure), including a testing machine body (not shown in the figure) and a bolt tensile testing fixture, the testing machine body includes a placing part and a tensile part, the tensile part and the placing part are slidably connected in a direction approaching or moving away from each other, and the bolt tensile testing fixture can be selectively arranged between the tensile part and the placing part.

[0062] It should be noted that after the bolt 1 to be tested passes through the upper clamping block 61, the upper test block 4, the lower test block 5, and the lower clamping block 62 respectively, the upper test block 4 is clamped with the lower test block 5, and the limiting sleeve 63 is rotated until the limiting sleeve 63 abuts against the lower clamping block 62, and the two pressing blocks 2 are respectively inserted into the first positioning hole 41 and the second positioning hole 51, and the assembled bolt tensile test fixture is placed on the placement part, and the tensile part is moved in the direction close to the placement part, so that the two pressing blocks 2 apply opposite forces to the upper test block 4 and the lower test block 5 respectively, so as to apply opposite forces to the head and the screw of the bolt 1 to be tested, and perform a tensile test on the bolt 1 to be tested.

[0063] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A bolt tensile test fixture, characterized in that: include: Two pressing blocks (2), the two pressing blocks (2) being coaxially arranged along the stretching direction; At least two positioning blocks (3), the positioning blocks (3) being respectively arranged on the end surfaces of the two pressing blocks (2) close to each other; An upper test block (4) and a lower test block (5), wherein the upper test block (4) is provided with a first positioning hole (41) corresponding to the positioning block (3), and the lower test block (5) is provided with a second positioning hole (51) corresponding to the positioning block (3); the two pressing blocks (2) are respectively plugged into the upper test block (4) and the lower test block (5) through the positioning block (3); when the upper test block (4) is connected to the lower test block (5), the first positioning hole (41) and the second positioning hole (51) are staggered along the circumference of the pressing block (2); A clamping assembly (6), the clamping assembly (6) being connected to both the upper test block (4) and the lower test block (5) and being used to limit the position of the bolt (1) to be tested on the upper test block (4) and the lower test block (5); The upper test block (4), the lower test block (5), and the clamping assembly (6) are all arranged between the two pressing blocks (2), and are coaxially arranged with the pressing blocks (2) along the stretching direction.

2. The bolt tensile test fixture according to claim 1, characterized in that: The pressing block (2) is provided with a through hole (21), and the axis of the through hole (21) coincides with the axis of the pressing block (2) along the stretching direction.

3. The bolt tensile test fixture according to claim 1, characterized in that: Each of the pressing blocks (2) is connected to four positioning blocks (3), and the four positioning blocks (3) on the same pressing block (2) are arranged at intervals along the circumference of the pressing block (2).

4. The bolt tensile test fixture according to claim 1, characterized in that: The lower test block (5) is provided with a limit block (52), and the upper test block (4) is provided with a limit slot (42) corresponding to the position of the limit block (52), so that the upper test block (4) is snap-fitted with the lower test block (5).

5. The bolt tensile test fixture according to claim 4, characterized in that: A plurality of the limit blocks (52) are provided, and the plurality of limit blocks (52) are arranged at intervals along the circumference of the lower test block (5), and one end of the limit block (52) is flush with the outer edge of the lower test block (5).

6. The bolt tensile test fixture according to claim 4, characterized in that: The second positioning hole (51) is formed on the limiting block (52), and one second positioning hole (51) is formed on one limiting block (52).

7. The bolt tensile test fixture according to any one of claims 1 to 6, characterized in that: The clamping assembly (6) comprises an upper clamping block (61) and a lower clamping block (62); the upper clamping block (61) and the lower clamping block (62) are respectively arranged on a side of the upper test block (4) and the lower test block (5) that are away from each other, and are used to clamp the bolt (1) to be tested.

8. The bolt tensile test fixture according to claim 7, characterized in that: The clamping assembly (6) further comprises a limiting sleeve (63), which is arranged on a side of the lower clamping block (62) away from the lower test block (5) and is threadedly connected to the bolt to be tested (1).

9. The bolt tensile test fixture according to claim 7, characterized in that: A positioning groove (611) is provided on a side of the upper clamping block (61) facing away from the upper test block (4), and the shape of the positioning groove (611) is adapted to the shape of the head of the bolt (1) to be tested.

10. A tensile testing machine, characterized in that: It comprises a testing machine body and a bolt tensile test fixture as described in any one of claims 1 to 9, wherein the testing machine body comprises a placing portion and a stretching portion, the stretching portion and the placing portion are slidably connected in a direction approaching or moving away from each other, and the bolt tensile test fixture can be selectively arranged between the stretching portion and the placing portion.

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