Multifunctional detection device for fastener

Abstract

The multifunctional detection device comprises a clamp, a first hinge shaft and a second hinge shaft, the clamp is provided with a third hinge shaft, a fourth hinge shaft, a fifth hinge shaft and a sixth hinge shaft, the third hinge shaft and the fourth hinge shaft are respectively arranged at the upper end and the lower end of the clamp, the fifth hinge shaft and the sixth hinge shaft are respectively arranged at the left side and the right side of the clamp, and the first hinge shaft and the second hinge shaft are respectively arranged on the left side and the right side of the clamp. The first hinge shaft is connected with a third hinge shaft, a fourth hinge shaft and a sixth hinge shaft through a first connecting rod, a second connecting rod and a third connecting rod, the second hinge shaft is connected with the third hinge shaft, the fourth hinge shaft and the fifth hinge shaft through a fourth connecting rod, a fifth connecting rod and a sixth connecting rod, and the clamp comprises an upper clamp body and a lower clamp body which are distributed from top to bottom; the upper clamp body and the lower clamp body are provided with installation holes for fastening pieces to penetrate through, the upper clamp body and the lower clamp body are both provided with receding holes, and the third connecting rod and the sixth connecting rod are distributed up and down. Compared with the prior art, the device is simple in overall structure, and can apply pull pressure and shear force to a fastener at the same time.

Description

A multifunctional testing device for fasteners Technical Field

[0001] This utility model relates to the field of fastener testing technology, and in particular to a multifunctional fastener testing device. Background Technology

[0002] Fasteners include bolts, screws, and studs. For example, bolts are widely used in connecting components, making their inspection crucial. This requires not only testing the static and dynamic parameters of bolted connections under tension and compression (strength, elongation, deformation, etc.), but also examining the static and dynamic mechanical properties and relaxation state of the threaded pair under complex conditions of simultaneous tension, compression, shear force, and bending moment. When performing dynamic tension and compression tests on a universal testing machine, existing fixtures often use hydraulic methods to clamp the ends of the bolted connection. This method can only apply tensile force, not shear force. Summary of the Invention

[0003] This invention provides a multifunctional testing device for fasteners, which solves the problem that existing testing methods cannot apply shear force while applying tensile force.

[0004] This utility model provides a multifunctional testing device for fasteners, comprising: a clamp, a first hinge shaft, and a second hinge shaft. The clamp is provided with a third hinge shaft, a fourth hinge shaft, a fifth hinge shaft, and a sixth hinge shaft. The third and fourth hinge shafts are respectively located at the upper and lower ends of the clamp, and the fifth and sixth hinge shafts are respectively located on the left and right sides of the clamp. The first hinge shaft is connected to the third, fourth, and sixth hinge shafts via a first connecting rod, a second connecting rod, and a third connecting rod, respectively. The second hinge shaft is connected to the third, fourth, and fifth hinge shafts via a fourth connecting rod, a fifth connecting rod, and a sixth connecting rod, respectively. The clamp includes an upper clamp body and a lower clamp body distributed from top to bottom. The fifth and sixth hinge shafts are respectively located on the lower clamp body and the upper clamp body. The third and sixth connecting rods are distributed vertically. The upper and lower clamp bodies are provided with mounting holes for fasteners to pass through, and both the upper and lower clamp bodies are provided with clearance holes at the mounting holes.

[0005] Preferably, the first hinge pin, the second hinge pin, the third hinge pin, the fourth hinge pin, the fifth hinge pin, and the sixth hinge pin constitute a hinge pin group, and the first connecting rod, the second connecting rod, the third connecting rod, the fourth connecting rod, the fifth connecting rod, and the sixth connecting rod constitute a connecting rod group, and the connection between the hinge pin group and the connecting rod group is an interference fit.

[0006] Preferably, it further includes a retaining ring disposed at the end of the first hinge shaft, the second hinge shaft, the third hinge shaft, the fourth hinge shaft, the fifth hinge shaft, and the sixth hinge shaft.

[0007] Preferably, a positioning pin and a positioning groove are provided between the upper clamp and the lower clamp, the positioning pin slides left and right along the positioning groove, and the mounting hole passes through the positioning pin and the positioning groove.

[0008] Preferably, the positioning groove is a waist-shaped groove.

[0009] Preferably, it also includes a positioning post, through which the mounting hole passes, and the lower clamp is provided with a positioning hole adapted to the positioning post, and the positioning post is provided with an internal thread adapted to the fastener.

[0010] Preferably, the positioning hole is an oblong hole, and the lower end of the positioning post is provided with a baffle, the width of which is greater than the diameter of the positioning hole.

[0011] Preferably, the upper end of the positioning post is provided with a guide hole.

[0012] Preferably, it further includes a first positioning sleeve and a second positioning sleeve. The first positioning sleeve has a first through hole with a diameter larger than that of the fastener. The second positioning sleeve has an internal thread that matches the fastener. The first positioning sleeve and the second positioning sleeve are detachably connected to the upper clamping body and the lower clamping body, respectively.

[0013] Preferably, the upper clamping body is provided with a first stepped hole that is adapted to the first positioning sleeve, and the lower clamping body is provided with a second stepped hole that is adapted to the second positioning sleeve.

[0014] Preferably, the first link, the second link, the fourth link, and the fifth link have the same length.

[0015] Preferably, the upper clamping body and the lower clamping body are respectively provided with an upper clamping interface and a lower clamping interface, and the upper clamping interface and the lower clamping interface are located on the line connecting the third hinge axis and the fourth hinge axis.

[0016] Compared with existing technologies, this utility model has a simple overall structure. The fastener is fixed to the upper and lower clamps, and a testing machine clamps the fastener to perform tensile and compressive tests. After installing the hinge assembly and connecting rod assembly on the clamps, using the testing machine to apply tensile or compressive forces to the fastener not only applies tensile or compressive forces, but these forces can also be transmitted through the connecting rod assembly and transformed into shear forces applied to the fastener. This simulates the loads experienced by the fastener under actual working conditions, allowing for the testing of the fastener's mechanical properties. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 is a structural schematic diagram of Embodiment 1 of this utility model;

[0019] Figure 2 is a schematic diagram of the fixture in Embodiment 1 of this utility model;

[0020] Figure 3 is an exploded structural diagram of the fixture according to Embodiment 1 of this utility model;

[0021] Figure 4 is a partial cross-sectional schematic diagram of the clamp in Embodiment 1 of this utility model;

[0022] Figure 5 is a structural schematic diagram of Embodiment 2 of this utility model;

[0023] Figure 6 is a schematic diagram of the fixture in Embodiment 2 of this utility model;

[0024] Figure 7 is an exploded structural diagram of the clamp according to Embodiment 2 of this utility model.

[0025] Figure 8 is a structural schematic diagram of Embodiment 3 of this utility model;

[0026] Figure 9 is a structural schematic diagram of the clamp in Embodiment 3 of this utility model;

[0027] Figure 10 is an exploded structural diagram of the clamp according to Embodiment 3 of this utility model;

[0028] Figure 11 is a partial cross-sectional view of the clamp according to Embodiment 3 of this utility model.

[0029] Figure label:

[0030] 1. Fixture; 2. First hinge shaft; 3. Second hinge shaft; 4. Third hinge shaft; 5. Fourth hinge shaft; 6. Fifth hinge shaft; 7. Sixth hinge shaft; 8. First connecting rod; 9. Second connecting rod; 10. Third connecting rod; 11. Fourth connecting rod; 12. Fifth connecting rod; 13. Sixth connecting rod; 14. Retaining ring; 15. Positioning pin; 16. Positioning groove; 17. Positioning post; 18. Positioning hole; 19. Baffle; 20. First positioning sleeve; 21. Second positioning sleeve; 22. First through hole; 011. Upper clamping body; 012. Lower clamping body; 0111. Upper clamping interface; 0121. Lower clamping interface; 100. Mounting hole; 200. Clearance hole. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] Example 1

[0033] Referring to Figures 1, 2, 5, and 8, this embodiment provides a multifunctional testing device for fasteners, including: a clamp 1, a first hinge shaft 2, and a second hinge shaft 3. The clamp 1 is provided with a third hinge shaft 4, a fourth hinge shaft 5, a fifth hinge shaft 6, and a sixth hinge shaft 7. The third hinge shaft 4 and the fourth hinge shaft 5 are respectively located at the upper and lower ends of the clamp 1, and the fifth hinge shaft 6 and the sixth hinge shaft 7 are respectively located on the left and right sides of the clamp 1. The first hinge shaft 2 is connected to the third hinge shaft 4, the fourth hinge shaft 5, and the sixth hinge shaft 7 via a first connecting rod 8, a second connecting rod 9, and a third connecting rod 10, respectively. Then, the second hinge 3 is connected to the third hinge 4, the fourth hinge 5, and the fifth hinge 6 respectively through the fourth link 11, the fifth link 12, and the sixth link 13. The first link 8, the second link 9, and the third link 10 all rotate around the first hinge 2. The fourth link 11, the fifth link 12, and the sixth link 13 all rotate around the second hinge 3. The first link 8 and the fourth link 11 all rotate around the third hinge 4. The second link 9 and the fifth link 12 all rotate around the fourth hinge 5. The sixth link 13 rotates around the fifth hinge 6. The third link 10 rotates around the sixth hinge 7. The clamp 1 includes an upper clamping body 011 and a lower clamping body 012 distributed from top to bottom. The fifth hinge shaft 6 and the sixth hinge shaft 7 are respectively disposed on the lower clamping body 012 and the upper clamping body 011. The third connecting rod 10 and the sixth connecting rod 13 are distributed vertically. The upper clamping body 011 and the lower clamping body 012 are provided with mounting holes 100 for fasteners to pass through. Both the upper clamping body 011 and the lower clamping body 012 are provided with clearance holes 200 at the mounting holes 100. Fasteners pass through the mounting holes 100 and are fixed on the upper clamping body 011 and the lower clamping body 012. The clearance holes 200 are designed to provide space for fastener installation. In this invention, the first hinge 2, the second hinge 3, the third hinge 4, and the fourth hinge 5 form the four vertices of a quadrilateral. When the testing machine stretches the fastener through the upper clamp 011 and the lower clamp 012, the fastener bears the tensile force. At this time, the distance between the third hinge 4 and the fourth hinge 5 on the upper clamp 011 and the lower clamp 012 tends to increase, which in turn makes the distance between the first hinge 2 and the second hinge 3 tend to decrease. The first hinge 2 and the second hinge 3 apply shear force to the fastener through the third connecting rod 10 and the sixth connecting rod 13, respectively. When the testing machine compresses the fastener through the upper clamp 011 and lower clamp 012, the fastener bears the compressive force. At this time, the distance between the third hinge shaft 4 and the fourth hinge shaft 5 on the upper clamp 011 and lower clamp 012 tends to shorten, while the distance between the first hinge shaft 2 and the second hinge shaft 3 tends to lengthen. The first hinge shaft 2 and the second hinge shaft 3 apply reverse shear force to the fastener through the third connecting rod 10 and the sixth connecting rod 13, respectively. This invention can test the static and dynamic mechanical properties and relaxation state of fasteners under complex working conditions of applying tensile, compressive, and shear forces. The overall structure is simple and easy to operate.

[0034] In another embodiment of this utility model: the first hinge shaft 2, the second hinge shaft 3, the third hinge shaft 4, the fourth hinge shaft 5, the fifth hinge shaft 6, and the sixth hinge shaft 7 constitute a hinge shaft group; the first connecting rod 8, the second connecting rod 9, the third connecting rod 10, the fourth connecting rod 11, the fifth connecting rod 12, and the sixth connecting rod 13 constitute a connecting rod group. The connection between the hinge shaft group and the connecting rod group is an interference fit, and the interference amount is determined according to the load size of each hinge shaft. This structural design ensures the accuracy of the detection.

[0035] In another embodiment of this utility model, this embodiment further includes a retaining ring 14, which is disposed at the ends of the first hinge pin 2, the second hinge pin 3, the third hinge pin 4, the fourth hinge pin 5, the fifth hinge pin 6, and the sixth hinge pin 7. After the first connecting rod 8 and the fourth connecting rod 11 are fitted onto the third hinge pin 4, the retaining ring 14 is engaged with the third hinge pin 4 to limit their movement and prevent them from falling off. Similarly, the retaining ring 14 limits the movement of the second connecting rod 9, the third connecting rod 10, the fifth connecting rod 12, and the sixth connecting rod 13 on the hinge pin assembly. This structural design facilitates the assembly and disassembly of the device.

[0036] In another embodiment of this utility model: Referring to Figures 3 and 4, a positioning pin 15 and a positioning groove 16 are provided between the upper clamping body 011 and the lower clamping body 012. The positioning pin 15 slides left and right along the positioning groove 16. The upper clamping body 011 and the lower clamping body 012 are positioned in the front-back direction by the positioning pin 15 and the positioning groove 16. The left-right sliding of the positioning pin 15 along the positioning groove 16 facilitates the testing of the fastener's performance under shear force. Specifically, the positioning pin 15 is fixed to the upper end of the lower clamping body 012, and the positioning groove 16 is provided at the bottom of the upper clamping body 011. The mounting hole 100 passes through the positioning pin 15 and the positioning groove 16.

[0037] As another embodiment of this utility model: the positioning groove 16 is an oblong groove, and the length of the positioning groove 16 is greater than the length of the positioning pin 15, so as to facilitate the positioning pin 15 to slide left and right along the positioning groove 16.

[0038] In another embodiment of this utility model: the first link 8, the second link 9, the fourth link 11 and the fifth link 12 have the same length, and the four of them form a rhombus structure. The third link 10 and the fifth link 12 are both inclined.

[0039] In another embodiment of this utility model: the upper clamping body 011 and the lower clamping body 012 are respectively provided with an upper clamping interface 0111 and a lower clamping interface 0121, which are located on the line connecting the third hinge shaft 4 and the fourth hinge shaft 5. The upper clamping interface 0111 and the lower clamping interface 0121 are provided to facilitate clamping by the testing machine.

[0040] In this embodiment, the fastener is a bolt. The upper clamp 011 and lower clamp 012 are positioned and installed using the positioning pin 15 and positioning groove 16. Then, the bolt is inserted into the mounting hole 100 and tightened with a nut. Next, the third hinge shaft 4 is inserted into the upper hinge shaft hole of the upper clamp 011, and the holes at the ends of the first connecting rod 8 and the fourth connecting rod 11 are placed into the third hinge shaft 4. Similarly, the fourth hinge shaft 5 is inserted into the lower hinge shaft hole of the lower clamp 012, and the holes at the ends of the second connecting rod 9 and the fifth connecting rod 12 are placed into the fourth hinge shaft 5. Then, the fifth hinge shaft 6 and the sixth hinge shaft 7 are inserted into the side hinge shaft holes of the lower clamp 012 and the upper clamp 011, respectively. During insertion, the holes at the ends of the third connecting rod 10 and the sixth connecting rod 13 are also placed into the fifth hinge shaft 6 and the sixth hinge shaft 7, respectively. The connecting rod assembly is then connected using the first hinge shaft 2 and the second hinge shaft 3. Finally, the retaining ring 14 is embedded into both ends of each hinge shaft for positioning.

[0041] At this point, the bolted connection is fixed to the device. When the testing machine performs a tensile test, part of the tensile force is transmitted to the bolt through the upper clamp 011, causing the bolt to be subjected to tensile force. Another part of the tensile force is transmitted to the side of the clamp 1 through the connecting rod assembly, transforming into shear force on the bolt. The bolt is then subjected to both tensile and shear forces, thus simulating the complex working condition of a bolted connection simultaneously subjected to tensile and shear forces, to meet the requirements of more complex mechanical performance testing. When the bolt only needs to be subjected to tensile force, the connecting rod assembly, the first hinge 2, and the second hinge 3 can be removed. In this case, the tensile force provided by the testing machine is applied to the bolt through the upper clamp 011, simulating the working condition of the bolted connection under only tensile force. Furthermore, this device is characterized by its simple and compact structure and small size.

[0042] Example 2

[0043] This embodiment is basically the same as Embodiment 1, except that:

[0044] As another embodiment of this utility model: Referring to Figures 6-7, this embodiment further includes a positioning post 17, through which a mounting hole 100 passes. The lower clamping body 012 is provided with a positioning hole 18 adapted to the positioning post 17, and the positioning post 17 is provided with an internal thread adapted to the fastener. The positioning post 17 and the lower clamping body 012 are detachably connected, facilitating the replacement of the positioning post 17 at any time. This structural design allows for the installation of fasteners of different specifications by replacing different positioning posts 17.

[0045] In another embodiment of this utility model: the positioning hole 18 is an oblong hole, and the lower end of the positioning post 17 is provided with a baffle 19, the width of which is greater than the diameter of the positioning hole 18. The baffle 19 prevents the positioning post 17 in the positioning hole 18 from moving upward further. Specifically, the upper end of the positioning post 17 is provided with a guide hole to guide the fastener into the positioning post 17.

[0046] As another embodiment of this utility model: the positioning pin 17 is installed in the positioning hole 18 by interference fit.

[0047] In this embodiment, the fastener is a screw. The positioning pin 17 is installed in the positioning hole 18 of the lower clamping body 012 through an interference fit, and the upper clamping body 011 and the lower clamping body 012 are coaxially connected. Then, the screw is screwed into the positioning pin 17 of the lower clamping body 012 after passing through the mounting hole 100 of the upper clamping body 011. On this basis, the third hinge pin 4 is inserted into the upper hinge pin hole of the upper clamping body 011, and the holes at the ends of the first connecting rod 8 and the fourth connecting rod 11 are placed into the third hinge pin 4. Similarly, the fourth hinge pin 5 is inserted into the lower hinge pin hole of the lower clamping body 012, and the holes at the ends of the second connecting rod 9 and the fifth connecting rod 12 are placed into the fourth hinge pin 5. Then, the fifth hinge pin 6 and the sixth hinge pin 7 are respectively inserted into the side hinge pin holes of the lower clamping body 012 and the side hinge pin holes of the upper clamping body 011, and during the insertion process, the holes at the ends of the third connecting rod 10 and the sixth connecting rod 13 are also placed into the fifth hinge pin 6 and the sixth hinge pin 7, respectively. The connecting rod assembly is then connected using the first hinge pin 2 and the second hinge pin 3, and finally the retaining ring 14 is embedded into both ends of each hinge pin for limiting.

[0048] At this point, the screw is fixed to the device. When the testing machine performs a tensile test, part of the tensile force is transmitted to the screw through the upper clamp 011, causing the screw to be subjected to tensile force. Another part of the tensile force is transmitted to the side of the clamp 1 through the connecting rod assembly, transforming into a shear force on the screw. The screw is then subjected to both tensile and shear forces, thus simulating the complex working condition of a screw connection simultaneously subjected to tensile and shear forces, to meet the requirements of more complex mechanical performance testing. When the screw only needs to be subjected to tensile force, the connecting rod assembly, the first hinge 2, and the second hinge 3 can be removed. In this case, the tensile force provided by the testing machine is applied to the screw through the upper clamp 011, simulating the working condition of the screw connection under only tensile force. Furthermore, this device features a simple and compact structure and small size, and can test screws of different specifications by replacing different positioning pins 17.

[0049] Example 3

[0050] This embodiment is basically the same as Embodiment 1, except that:

[0051] As another embodiment of this utility model: Referring to Figures 9-10, this embodiment further includes a first positioning sleeve 20 and a second positioning sleeve 21. The first positioning sleeve 20 is provided with a first through hole 22, the diameter of which is larger than the diameter of the fastener. The second positioning sleeve 21 is provided with an internal thread adapted to the fastener. This structural design facilitates the fastener passing through the first positioning sleeve 20 and threadedly connecting to the second positioning sleeve 21. The first positioning sleeve 20 and the second positioning sleeve 21 are detachably connected to the upper clamp 011 and the lower clamp 012, respectively. This structural design allows for the installation of fasteners of different specifications by replacing different first positioning sleeves 20 and second positioning sleeves 21.

[0052] In another embodiment of this utility model: Referring to Figures 10 and 11, the upper clamping body 011 is provided with a first stepped hole adapted to the first positioning sleeve 20, and the lower clamping body 012 is provided with a second stepped hole adapted to the second positioning sleeve 21. Specifically, the upper diameter of the first stepped hole is larger than the lower diameter, and the lower diameter of the second stepped hole is larger than the upper diameter. The first positioning sleeve 20 is installed in the first stepped hole by interference fit, and the second positioning sleeve 21 is installed in the second stepped hole by interference fit.

[0053] In this embodiment, the fastener is a double-ended stud. The first positioning sleeve 20 is installed on the upper clamping body 011 with an interference fit, and the second positioning sleeve 21 is installed on the lower clamping body 012 with an interference fit. The upper clamping body 011 and the lower clamping body 012 are coaxially connected. The double-ended stud is passed through the first through hole 22 of the first positioning sleeve 20 and screwed into the second positioning sleeve 21 of the lower clamping body 012. Then, the double-ended stud is fixed to the upper clamping body 011 with a nut. On this basis, the third hinge shaft 4 is inserted into the upper hinge shaft hole of the upper clamping body 011, and the holes at the ends of the first connecting rod 8 and the fourth connecting rod 11 are placed into the third hinge shaft 4. Similarly, the fourth hinge shaft 5 is inserted into the lower hinge shaft hole of the lower clamping body 012, and the holes at the ends of the second connecting rod 9 and the fifth connecting rod 12 are placed into the fourth hinge shaft 5. Then, the fifth hinge pin 6 and the sixth hinge pin 7 are inserted into the hinge pin holes on the side of the lower clamp 012 and the upper clamp 011, respectively. During the insertion process, the holes at the ends of the third connecting rod 10 and the sixth connecting rod 13 are also placed into the fifth hinge pin 6 and the sixth hinge pin 7, respectively. The connecting rod assembly is then connected using the first hinge pin 2 and the second hinge pin 3. Finally, the retaining ring 14 is inserted into both ends of each hinge pin for positioning.

[0054] At this point, the double-ended stud is fixed to the device. When the testing machine performs a tensile test, part of the tensile force is transmitted to the double-ended stud through the upper clamp 011, causing the stud to be subjected to tensile force. Another part of the tensile force is transmitted to the side of the clamp 1 through the connecting rod assembly, transforming it into a shear force on the double-ended stud. Thus, the double-ended stud is subjected to both tensile and shear forces, simulating the complex working condition of a double-ended stud connection simultaneously subjected to tensile and shear forces, to meet the requirements of more complex mechanical performance testing. When the double-ended stud only needs to be subjected to tensile force, the connecting rod assembly, the first hinge 2, and the second hinge 3 can be removed. In this case, the tensile force provided by the testing machine is applied to the double-ended stud through the upper clamp 011, simulating the working condition of the double-ended stud connection under only tensile force. Furthermore, this device features a simple and compact structure and small size. Different specifications of double-ended studs can be tested by replacing different first positioning sleeves 20 and second positioning sleeves 21.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A multifunctional testing device for fasteners, characterized in that, include: The fixture comprises a first hinge shaft and a second hinge shaft. The fixture is further provided with a third hinge shaft, a fourth hinge shaft, a fifth hinge shaft, and a sixth hinge shaft. The third and fourth hinge shafts are located at the upper and lower ends of the fixture, respectively. The fifth and sixth hinge shafts are located on the left and right sides of the fixture, respectively. The first hinge shaft is connected to the third, fourth, and sixth hinge shafts via a first, second, and third connecting rod, respectively. The second hinge shaft is connected to the third, fourth, and fifth hinge shafts via a fourth, fifth, and sixth connecting rod, respectively. The fixture includes an upper clamping body and a lower clamping body distributed from top to bottom. The fifth and sixth hinge shafts are located on the lower clamping body and the upper clamping body, respectively. The third and sixth connecting rods are arranged vertically. The upper and lower clamping bodies are provided with mounting holes for fasteners to pass through. Both the upper and lower clamping bodies have clearance holes at the mounting holes.

2. The multifunctional inspection apparatus for fasteners according to claim 1, wherein The first hinge pin, the second hinge pin, the third hinge pin, the fourth hinge pin, the fifth hinge pin, and the sixth hinge pin constitute a hinge pin group, and the first connecting rod, the second connecting rod, the third connecting rod, the fourth connecting rod, the fifth connecting rod, and the sixth connecting rod constitute a connecting rod group. The connection between the hinge pin group and the connecting rod group is an interference fit.

3. The multifunctional inspection apparatus of fasteners according to claim 2, wherein, It also includes retaining rings disposed at the ends of the first hinge shaft, the second hinge shaft, the third hinge shaft, the fourth hinge shaft, the fifth hinge shaft, and the sixth hinge shaft.

4. The multifunctional testing device for fasteners according to claim 3, characterized in that, A positioning pin and a positioning groove are provided between the upper clamp and the lower clamp. The positioning pin slides left and right along the positioning groove, and the mounting hole passes through the positioning pin and the positioning groove.

5. The multifunctional testing device for fasteners according to claim 3, characterized in that, It also includes a positioning post, through which the mounting hole passes, and the lower clamp is provided with a positioning hole adapted to the positioning post. The positioning post is provided with an internal thread adapted to the fastener.

6. The multifunctional inspection apparatus of fasteners according to claim 5, wherein, The positioning hole is an oblong hole, and a baffle is provided at the lower end of the positioning post. The width of the baffle is greater than the diameter of the positioning hole.

7. The multifunctional testing device for fasteners according to claim 3, characterized in that, It also includes a first positioning sleeve and a second positioning sleeve. The first positioning sleeve has a first through hole with a diameter larger than that of the fastener. The second positioning sleeve has an internal thread that matches the fastener. The first positioning sleeve and the second positioning sleeve are detachably connected to the upper clamp and the lower clamp, respectively.

8. The multifunctional inspection apparatus of fasteners according to claim 7, wherein, The upper clamping body is provided with a first stepped hole that is adapted to the first positioning sleeve, and the lower clamping body is provided with a second stepped hole that is adapted to the second positioning sleeve.

9. The multifunctional inspection apparatus of fasteners according to claim 3, wherein, The first link, the second link, the fourth link, and the fifth link have the same length.

10. The multifunctional testing device for fasteners according to claim 9, characterized in that, The upper clamping body and the lower clamping body are respectively provided with an upper clamping interface and a lower clamping interface, which are located on the line connecting the third hinge axis and the fourth hinge axis.

Images