Bolt and nut clamping force testing device

Abstract

The utility model provides a bolt and nut clamping force testing device comprising a first pressing plate and a second pressing plate which are arranged at an interval, the first pressing plate is provided with a first through hole, and the second pressing plate is provided with a second through hole; the pressure sensor is installed between the first pressing plate and the second pressing plate, the side, close to the first pressing plate, of the pressure sensor is attached to the first pressing plate, the side, close to the second pressing plate, of the pressure sensor is attached to the second pressing plate, and a third through hole is formed in the pressure sensor; the positioning part is hollow and is provided with a mounting hole for accommodating a to-be-tested bolt, one end, far away from the testing part of the to-be-tested bolt, of the positioning part is provided with an abutting part abutting against the pressure sensor, and the positioning part sequentially penetrates through the first through hole and the third through hole so that the testing part can extend out of the second pressing plate through the second through hole. The device for testing the clamping force of the bolt and the nut solves the technical problem that the clamping force of the bolt and the nut cannot be directly tested in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to bolt and nut clamping force detection technical field, concretely relates to a bolt and nut clamping force testing device. BACKGROUND

[0002] When the traditional test bolt and nut clamping force is in the case without the help of corresponding tool fixture, the traditional pressure sensor cannot directly measure the clamping force between bolt and nut, often only relies on external special force measuring equipment, needs to outsource some mechanical laboratory with special force measuring equipment, however, this method not only takes a long time, but also is accompanied by high cost, leads to the overall cost rise, and can delay the progress of the project.

[0003] Therefore, the prior art needs to be further developed. UTILITARY MODEL CONTENT

[0004] The utility model aims at overcoming the above technical insufficiency, provides a bolt and nut clamping force testing device to solve the technical problem of unable direct test bolt and nut clamping force in relevant technology.

[0005] In order to achieve the above technical purpose, the utility model adopts the following technical scheme: a bolt and nut clamping force testing device is provided, which comprises: first and second spacers, a first through hole is formed in the first spacer, and a second through hole is formed in the second spacer; a pressure sensor is installed between the first and second spacers, the side of the pressure sensor close to the first spacer is attached to the first spacer, the side of the pressure sensor close to the second spacer is attached to the second spacer, and a third through hole is formed in the pressure sensor; a positioning component is provided with a mounting hole for accommodating the bolt to be tested, and the end of the positioning component away from the test part of the bolt to be tested is provided with an abutting part abutting against the pressure sensor; the positioning component passes through the first and third through holes in sequence, so that the test part extends out of the second spacer through the second through hole.

[0006] Further, the positioning component comprises a first connecting segment and a second connecting segment connected to each other, the first connecting segment is located on the side of the positioning component away from the second spacer, the outer diameter of the first connecting segment is greater than that of the second connecting segment, and the end of the first connecting segment close to the second connecting segment is provided with the abutting part.

[0007] Further, the first connecting segment is provided with a rotation stopping structure, and a matching part matched with the rotation stopping structure is arranged in the first through hole to limit the relative rotation of the positioning component.

[0008] Further, the outer periphery of the second connecting segment is provided with an external thread, the inner surface of the third through hole is provided with an internal thread, and the external thread is matched with the internal thread.

[0009] Further, the mounting hole comprises a first mounting hole and a second mounting hole, the second mounting hole is in communication with the first mounting hole, the first mounting hole is located at one end of the mounting hole away from the test part, and the inner diameter of the first mounting hole is larger than that of the second mounting hole.

[0010] Further, the to-be-tested bolt is fixedly connected with the second mounting hole; and / or, the to-be-tested bolt is in interference fit with the second mounting hole.

[0011] Further, an avoiding groove is formed on one side of the second pressing plate close to the pressure sensor, and the avoiding groove is in communication with the second through hole.

[0012] Further, a first fixing hole is formed on the first pressing plate, a second fixing hole is formed on the pressure sensor, and a third fixing hole is formed on the second pressing plate, the bolt-nut clamping force testing device comprises a fastener, the fastener passes through the third fixing hole, the second fixing hole and the first fixing hole in sequence, wherein the fastener comprises a plurality of fasteners, the plurality of fasteners are distributed at intervals around the circumference of the pressure sensor, and the third fixing hole, the second fixing hole and the first fixing hole are each provided with a plurality of fixing holes corresponding to the plurality of fasteners.

[0013] Further, the bolt-nut clamping force testing device comprises a fixed base, the fixed base is provided with a first support column and a second support column arranged oppositely, and the first support column and the second support column are respectively fixedly connected with the first pressing plate.

[0014] Further, a first mounting plate is mounted on the first support column, and the first mounting plate is perpendicular to the first support column; a second mounting plate is mounted on the second support column, and the second mounting plate is perpendicular to the second support column; and one side of the first pressing plate away from the pressure sensor is connected with the first mounting plate and the second mounting plate respectively.

[0015] Advantageous effects:

[0016] 1. The positioning component is designed in a hollow structure, and an installation hole for accommodating the to-be-tested bolt is arranged inside, thereby ensuring the stability of the bolt during the test. One end of the positioning component is provided with an abutting portion, which directly contacts the pressure sensor and transmits the clamping force applied by the to-be-tested bolt to the pressure sensor. The design of the positioning component not only ensures the accurate positioning of the bolt during the test, but also effectively transmits the clamping force; by replacing the positioning components with different specifications of installation holes, the clamping force of the to-be-tested bolts with different thicknesses can be detected, and the outer dimensions of the positioning components remain unchanged, thereby improving the versatility of the testing device, realizing rapid clamping, and making the operation more convenient, and further reducing the testing cost.

[0017] 2. By applying different torques, the pressure sensor can test the clamping force data under different conditions, thereby completing the test target, and solving the technical problem that the clamping force of the bolt and the nut cannot be directly tested in the related art.

[0018] 3、The bolt and nut clamping force testing device of the embodiment can directly measure the clamping force between the bolt and the nut, adopts a fast clamping scheme, and is simple and easy to operate. The device is made of a traditional pressure sensor, has low cost, and the testing method is simple and reliable. It not only shortens the testing time, saves the test period, but also reduces the cost, improves the production efficiency and labor efficiency. Through increasing the inspection frequency, the product qualification rate is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of the bolt and nut clamping force testing device adopted by the embodiment of the utility model;

[0020] Figure 2 is a top view of the bolt and nut clamping force testing device adopted by the embodiment of the utility model;

[0021] Figure 3 is a front view of the bolt and nut clamping force testing device adopted by the embodiment of the utility model;

[0022] Figure 4 is Figure 3 A-A sectional view in the above-mentioned;

[0023] Figure 5 is Figure 4 the enlarged view of B in the above-mentioned;

[0024] Figure 6 is an exploded view of the bolt and nut clamping force testing device adopted by the embodiment of the utility model;

[0025] Figure 7 is a structural schematic view of the positioning component of the bolt and nut clamping force testing device adopted by the embodiment of the utility model.

[0026] Among the above-mentioned drawings, the following reference signs are included:

[0027] 1, first pressing plate; 11, first through hole; 12, first fixed hole; 2, second pressing plate; 21, second through hole; 22, third fixed hole; 23, avoiding groove; 3, pressure sensor; 31, third through hole; 32, second fixed hole; 4, positioning component; 401, first connecting section; 402, second connecting section; 41, mounting hole; 411, first mounting hole; 412, second mounting hole; 42, abutment part; 43, rotation stopping structure; 5, bolt to be tested; 51, testing part; 6, fastener; 7, fixed base; 71, first supporting column; 72, second supporting column; 73, first mounting plate; 74, second mounting plate; 8, nut. DETAILED DESCRIPTION

[0028] In order for those skilled in the art to better understand the scheme of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0029] According to the bolt and nut clamping force testing device provided in the embodiments of the present application, please refer to Figures 1 to 7 , which comprises: a first pressing plate 1 and a second pressing plate 2 arranged at intervals, a first through hole 11 is formed on the first pressing plate 1, and a second through hole 21 is formed on the second pressing plate 2; a pressure sensor 3 is installed between the first pressing plate 1 and the second pressing plate 2, the side of the pressure sensor 3 close to the first pressing plate 1 is attached to the first pressing plate 1, the side of the pressure sensor 3 close to the second pressing plate 2 is attached to the second pressing plate 2, and a third through hole 31 is formed on the pressure sensor 3; a positioning component 4 is hollowly provided with a mounting hole 41 for accommodating a bolt 5 to be tested, and an abutting portion 42 abutting against the pressure sensor 3 is arranged at the end of the positioning component 4 away from the testing portion 51 of the bolt 5 to be tested, and the positioning component 4 passes through the first through hole 11 and the third through hole 31 in sequence, so that the testing portion 51 extends out of the second pressing plate 2 through the second through hole 21.

[0030] By arranging the first pressing plate 1 and the second pressing plate 2, the first pressing plate 1 and the second pressing plate 2 are arranged at intervals to form a stable frame, the first pressing plate 1 provides support for the pressure sensor 3 and the second pressing plate 2, and the pressure sensor 3 is located between the two pressing plates, which not only ensures the accurate transmission of clamping force, but also avoids external interference; after the testing portion 51 extends out of the second pressing plate 2, it is convenient for subsequent tightening of the nut 8, and further simulates the clamping force under actual working conditions.

[0031] The positioning component 4 is designed to be hollow, and the mounting hole 41 for accommodating the bolt 5 to be tested is arranged inside, which ensures the stability of the bolt during the testing process. One end of the positioning component 4 is provided with the abutting portion 42, which directly contacts the pressure sensor 3, and the clamping force applied by the bolt 5 to be tested is transmitted to the pressure sensor 3. The design of the positioning component 4 not only ensures the accurate positioning of the bolt during the testing process, but also effectively transmits the clamping force.

[0032] At the same time, by using the positioning component 4, the clamping force detection of the bolts 5 to be tested with different thicknesses can be realized by replacing the positioning component 4 with different specifications of the mounting hole 41, and the outer dimensions of the positioning component 4 remain unchanged, thereby improving the universality of the testing device, realizing quick clamping, and making the operation more convenient, and further reducing the testing cost.

[0033] In this way, when the whole bolt and nut clamping force testing device is assembled, the positioning and fixing of the bolt to be tested 5 are completed, the nut 8 is screwed in, the specified torque is applied according to the test requirements, the testing is carried out, the relative displacement of the bolt to be tested 5 and the positioning component 4 occurs, the abutting portion 42 directly contacts the pressure sensor 3, the clamping force generated by the relative displacement is directly applied to the pressure sensor 3, the pressure sensor 3 is deformed under stress, and at the same time, the deformation amount is converted into electrical signal data to form the clamping force value, and the pressure sensor 3 transmits the stress value to the pressure sensing and collecting device. By applying different torques, the pressure sensor 3 can test the clamping force data under different conditions, thereby completing the test target and solving the technical problem that the clamping force of the bolt and the nut cannot be directly tested in the related art.

[0034] In the bolt and nut clamping force testing device of the embodiment, referring to Figure 5 or Figure 7 , the positioning component 4 includes a first connecting segment 401 and a second connecting segment 402 connected to each other, the first connecting segment 401 is located on the side of the positioning component 4 away from the second pressing plate 2, the outer diameter of the first connecting segment 401 is greater than that of the second connecting segment 402, and the abutting portion 42 is arranged on the end of the first connecting segment 401 close to the second connecting segment 402. In this way, on the one hand, it can be matched with the shape of the bolt head, so as to accommodate the bolt to be tested 5, and on the other hand, a stepped surface is formed between the first connecting segment 401 and the second connecting segment 402, and the abutting portion 42 is formed, which directly contacts the pressure sensor 3, so as to transmit the clamping force applied by the bolt to be tested 5 to the pressure sensor 3.

[0035] In some embodiments, the first connecting segment 401 and the second connecting segment 402 are both cylindrical structures.

[0036] In the bolt and nut clamping force testing device of the embodiment, referring to Figure 7 , the first connecting segment 401 is provided with a rotation stopping structure 43, and a matching portion matched with the rotation stopping structure 43 is arranged in the first through hole 11 to limit the relative rotation of the positioning component 4. In this way, by arranging the rotation stopping structure 43 and the matching portion, the relative rotation of the positioning component 4 is limited, so as to prevent the positioning component 4 from rotating when the torque is applied to the nut 8, and further prevent the bolt to be tested 5 from rotating, thereby causing inaccurate test data.

[0037] In some embodiments, the rotation stopping structure 43 is a rotation stopping surface, that is, a vertical surface is added to the outside of the cylindrical first connecting segment 401, the extension direction of the vertical surface is parallel to the axis of the first connecting segment 401, and at the same time, the matching portion is a vertical surface arranged in the first through hole 11, the vertical surface on the first connecting segment 401 can abut against the vertical surface in the first through hole 11, so as to prevent the positioning component 4 from rotating.

[0038] In some embodiments, the limiting structure such as the spring pin and the limiting hole can also be used to limit the relative rotation of the limiting positioning component 4.

[0039] In the bolt and nut clamping force testing device of the embodiment, referring to Figure 5 , the outer periphery of the second connecting section 402 is provided with external threads, and the inner surface of the third through hole 31 is provided with internal threads, and the external threads are matched with the internal threads. In this way, the threaded structure is used, on the one hand, the positioning component 4 can be easily screwed into the third through hole 31, realizing quick clamping, on the other hand, the positioning component 4 is positioned and the relative movement of the positioning component 4 during the test is limited, further ensuring the positioning and fixing of the bolt 5 to be tested.

[0040] In the bolt and nut clamping force testing device of the embodiment, referring to Figure 5 , the mounting hole 41 includes a first mounting hole 411 and a second mounting hole 412, the second mounting hole 412 is in communication with the first mounting hole 411, the first mounting hole 411 is located at the end of the mounting hole 41 away from the test part 51, and the inner diameter of the first mounting hole 411 is larger than that of the second mounting hole 412. In this way, the shape of the bolt head is matched, so that the bolt 5 to be tested can be accommodated.

[0041] It can be understood that according to the model of the bolt to be tested, the size of the first mounting hole 411 and the second mounting hole 412 can be changed to realize the clamping force detection of different thickness of the bolt 5 to be tested, while the size of the positioning component 4 remains unchanged, thereby improving the universality of the testing device and further reducing the testing cost.

[0042] In the bolt and nut clamping force testing device of the embodiment, referring to Figure 5 , the bolt 5 to be tested is fixedly connected with the second mounting hole 412; and / or, the bolt 5 to be tested is interference fit with the second mounting hole 412.

[0043] In some embodiments, the bolt 5 to be tested is provided with a roll-flower part, and the roll-flower part is interference fit with the second mounting hole 412 to fix the bolt 5 to be tested, further limiting the relative displacement of the bolt 5 to be tested, and improving the accuracy of the test.

[0044] In some embodiments, after the bolt 5 to be tested is installed in the second mounting hole 412, the bolt 5 to be tested and the positioning component 4 can be spot welded, so as to fixedly connect the bolt 5 to be tested with the second mounting hole 412, to fix the bolt 5 to be tested, further limit the relative displacement of the bolt 5 to be tested, and improve the accuracy of the test.

[0045] In some embodiments, the structure that the roll flower part is in interference fit with the second mounting hole 412 and the bolt 5 to be tested and the positioning part 4 are spot welded at the same time can fully ensure that the relative displacement of the bolt 5 to be tested is limited, and the accuracy of the test is improved.

[0046] In the bolt and nut clamping force testing device of the embodiment, referring to Figure 5 , the second pressing plate 2 is provided with an avoiding groove 23 on the side close to the pressure sensor 3, and the avoiding groove 23 is in communication with the second through hole 21.

[0047] It should be noted that the avoiding groove 23 can be matched with the positioning boss on the pressure sensor 3 to position the pressure sensor 3, and on the other hand, in the test process, the bolt 5 to be tested and the positioning part 4 displace relatively, the abutting part 42 directly contacts the pressure sensor 3, and the pressure sensor 3 is slightly deformed under force, so the avoiding groove 23 can avoid the pressure sensor 3.

[0048] In the bolt and nut clamping force testing device of the embodiment, referring to Figure 4 , the first pressing plate 1 is provided with a first fixing hole 12, the pressure sensor 3 is provided with a second fixing hole 32, and the second pressing plate 2 is provided with a third fixing hole 22. The bolt and nut clamping force testing device comprises a plurality of fasteners 6, which are sequentially arranged through the third fixing hole 22, the second fixing hole 32 and the first fixing hole 12. The plurality of fasteners 6 are arranged in a circular manner around the pressure sensor 3, and the third fixing hole 22, the second fixing hole 32 and the first fixing hole 12 are provided with a plurality of fixing holes corresponding to the plurality of fasteners 6. In this way, the first pressing plate 1, the pressure sensor 3 and the second pressing plate 2 are fixed by the fasteners, so that they become an integral whole, thereby ensuring the accuracy of the test data.

[0049] In some embodiments, the first pressing plate 1, the pressure sensor 3 and the second pressing plate 2 are all cylindrical structures, and the plurality of fasteners 6 are arranged in a circular manner.

[0050] In the bolt and nut clamping force testing device of the embodiment, referring to Figures 1-3 , the bolt and nut clamping force testing device comprises a fixed base 7, and the fixed base 7 is provided with a first support column 71 and a second support column 72 arranged oppositely, and the first support column 71 and the second support column 72 are fixedly connected with the first pressing plate 1 respectively. Through the above arrangement, the first support column 71 and the second support column 72 are arranged in a spaced manner, and the first pressing plate 1, the pressure sensor 3 and the second pressing plate 2 are accommodated between the first support column 71 and the second support column 72, and the fixed base 7 supports the first pressing plate 1, the pressure sensor 3 and the second pressing plate 2.

[0051] In the bolt and nut clamping force testing device of the embodiment, referring to Figures 1-3The first support column 71 is provided with a first mounting plate 73 which is perpendicular to the first support column 71; the second support column 72 is provided with a second mounting plate 74 which is perpendicular to the second support column 72; and the first pressing plate 1 is connected with the first mounting plate 73 and the second mounting plate 74 respectively at a side away from the pressure sensor 3. The first mounting plate 73 and the second mounting plate 74 are arranged to mount and fix the first pressing plate 1.

[0052] Specifically, the first mounting plate 73 and the second mounting plate 74 are provided with threaded holes, and the first pressing plate 1 is provided with threaded holes at two ends thereof, and the first pressing plate 1 is fastened and connected with the first mounting plate 73 and the second mounting plate 74 by fixed screws.

[0053] In the bolt and nut clamping force testing device, the longitudinal installation sequence is adopted, which is simpler than the lateral installation and can be completed by a single person; meanwhile, the nut to be tested is at the top in the longitudinal installation mode, which conforms to the ergonomics theory and is convenient for the tester to operate.

[0054] In some embodiments, the assembly process of the bolt and nut clamping force testing device is as follows:

[0055] 1. Place the fixed base 7 on the workbench, then place the first pressing plate 1 on the fixed base 7, and fasten and connect the first pressing plate 1 with the first mounting plate 73 and the second mounting plate 74 by fixed screws after aligning the bolt hole positions of the first mounting plate 73, the second mounting plate 74 and the two ends of the first pressing plate 1.

[0056] 2. Assemble the bolt 5 to be tested and the positioning component 4, and then spot weld the end position to fix the bolt 5 to be tested and the positioning component 4.

[0057] 3. The positioning component 4 has external threads, and the third through hole 31 of the pressure sensor 3 has internal threads, so that the assembled bolt 5 to be tested and the positioning component 4 can be easily screwed into the pressure sensor 3, and finally tightened with a wrench.

[0058] 4. Then place the assembled bolt 5 to be tested, positioning component 4 and pressure sensor 3 in the third step on the first pressing plate 1, and align the third fixing hole 22, second fixing hole 32 and first fixing hole 12.

[0059] 5. Place the second pressing plate 2 on the pressure sensor 3, and fasten and connect the second pressing plate 2 with the pressure sensor 3 by the fastener 6 after aligning the bolt hole positions.

[0060] After the bolt and nut clamping force testing device is adjusted according to the above steps, the nut 8 can be screwed in, and the specified torque is applied according to the test requirements to test the clamping force data under different conditions, so as to complete the test target.

[0061] The bolt and nut clamping force testing device of the embodiment has the following advantages: the clamping force between the bolt and the nut can be directly measured, the quick clamping scheme is adopted, and the operation is simple. The device is made of a conventional pressure sensor, has low cost, and the test method is simple and reliable. It not only shortens the test time, saves the test period, but also reduces the cost, improves the production efficiency and the labor efficiency. Through increasing the test frequency, the product qualification rate is further improved.

[0062] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0063] Alternatively, the specific examples in the embodiment can refer to the examples described in the above embodiments, and the embodiment will not be described here.

[0064] The above-mentioned serial numbers of the embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0065] In the above-mentioned embodiments of the present application, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0066] The above-mentioned only is the preferred embodiment of the present application, it should be pointed out, for the ordinary skilled in the art, without departing from the principle of the present application, can make a number of improvements and refinements, these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A bolt and nut clamping force testing device, characterized in that, include: A first pressure plate (1) and a second pressure plate (2) are spaced apart. The first pressure plate (1) has a first through hole (11) and the second pressure plate (2) has a second through hole (21). Pressure sensor (3) is installed between the first pressure plate (1) and the second pressure plate (2). The side of the pressure sensor (3) close to the first pressure plate (1) is in contact with the first pressure plate (1), and the side of the pressure sensor (3) close to the second pressure plate (2) is in contact with the second pressure plate (2). A third through hole (31) is provided on the pressure sensor (3). The positioning component (4) is hollow and has a mounting hole (41) for accommodating the bolt (5) to be tested. The end of the positioning component (4) away from the test part (51) of the bolt (5) to be tested is provided with an abutment part (42) that abuts against the pressure sensor (3). The positioning component (4) passes through the first through hole (11) and the third through hole (31) in sequence, so that the test part (51) extends out of the second pressure plate (2) through the second through hole (21).

2. The bolt and nut clamping force testing device according to claim 1, characterized in that, The positioning component (4) includes a first connecting segment (401) and a second connecting segment (402) connected to each other. The first connecting segment (401) is located on the side of the positioning component (4) away from the second pressure plate (2). The outer diameter of the first connecting segment (401) is larger than the outer diameter of the second connecting segment (402). The abutting part (42) is provided at the end of the first connecting segment (401) near the second connecting segment (402).

3. The bolt and nut clamping force testing device according to claim 2, characterized in that, The first connecting section (401) is provided with an anti-rotation structure (43), and the first through hole (11) is provided with a mating part that cooperates with the anti-rotation structure (43) to restrict the relative rotation of the positioning component (4).

4. The bolt and nut clamping force testing device according to claim 2, characterized in that, The outer circumferential surface of the second connecting section (402) is provided with an external thread, and the inner surface of the third through hole (31) is provided with an internal thread, and the external thread is adapted to the internal thread.

5. The bolt and nut clamping force testing device according to claim 1, characterized in that, The mounting hole (41) includes a first mounting hole (411) and a second mounting hole (412). The second mounting hole (412) communicates with the first mounting hole (411). The first mounting hole (411) is located at the end of the mounting hole (41) away from the test part (51). The inner diameter of the first mounting hole (411) is larger than the inner diameter of the second mounting hole (412).

6. The bolt and nut clamping force testing device according to claim 5, characterized in that, The test bolt (5) is fixedly connected to the second mounting hole (412); and / or, the test bolt (5) is interference-fitted with the second mounting hole (412).

7. The bolt and nut clamping force testing device according to claim 1, characterized in that, An avoidance groove (23) is provided on the side of the second pressure plate (2) near the pressure sensor (3), and the avoidance groove (23) is connected to the second through hole (21).

8. The bolt and nut clamping force testing device according to claim 1, characterized in that, The first pressure plate (1) has a first fixing hole (12), the pressure sensor (3) has a second fixing hole (32), the second pressure plate (2) has a third fixing hole (22), and the bolt and nut clamping force testing device includes a fastener (6), which passes through the third fixing hole (22), the second fixing hole (32), and the first fixing hole (12) in sequence; wherein, The fasteners (6) include a plurality of fasteners (6) which are distributed circumferentially around the pressure sensor (3). The third fixing hole (22), the second fixing hole (32), and the first fixing hole (12) are provided in a plurality of fasteners (6).

9. The bolt and nut clamping force testing device according to claim 1, characterized in that, The bolt and nut clamping force testing device includes a fixed base (7), on which a first support column (71) and a second support column (72) are arranged opposite to each other. The first support column (71) and the second support column (72) are respectively fixedly connected to the first pressure plate (1).

10. The bolt and nut clamping force testing device according to claim 9, characterized in that, A first mounting plate (73) is installed on the first support column (71), and the first mounting plate (73) is arranged perpendicular to the first support column (71); A second mounting plate (74) is installed on the second support column (72), and the second mounting plate (74) is set perpendicular to the second support column (72); The side of the first pressure plate (1) away from the pressure sensor (3) is connected to the first mounting plate (73) and the second mounting plate (74) respectively.

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