A clamping fixture for testing the loosening torque of high-locking nuts

Abstract

This invention relates to the technical field of force measurement devices for fastening nuts, specifically to a clamping fixture for testing the loosening torque of high-lock nuts. The clamping fixture includes a first clamping body and a second clamping body. The first clamping body includes a first clamping portion, and the second clamping body includes a second clamping portion. Both the first and second clamping portions are provided with clearance channels to avoid a test mandrel that mates with the test high-lock nut. The first and second clamping portions are spaced apart to clamp the working part of the test high-lock nut on both axial sides. The clamping fixture also includes a locking structure for relative movement between the first and second clamping portions. Because the first and second clamping bodies apply axial clamping force to the working part of the test high-lock nut, it avoids affecting the original force between the working part and the mandrel, thus improving the accuracy and reliability of the high-lock nut loosening torque test results.

Description

Technical Field

[0001] This invention relates to the technical field of fastening nut force measurement devices, specifically to a clamping fixture for testing the loosening torque of high-locking nuts. Background Technology

[0002] High-lock nuts are fasteners with a special structure, differing from conventional self-locking nuts. For example, the high-lock nut disclosed in Chinese invention patent application CN111069850A, published on April 28, 2020, includes a working part and a processing part. The processing part has a hexagonal structure, while the working part has a rotating structure. The connection between the working part and the processing part is a specially designed necking groove. During installation, the hexagonal processing part bears the tightening torque. When a certain torque is applied, the processing part breaks at the necking groove and separates from the working part of the nut, completing the high-lock nut assembly.

[0003] Loosening torque is one of the important performance indicators of high-lock nuts. The existing standard method for testing the loosening torque of high-lock nuts is as follows: After the high-lock nut is installed, the axial load is removed when the high-lock nut is not rotating relative to the bolt. During the process of removing the axial load, the nut or bolt must not be damaged. Then, the nut is turned in the unscrewing direction. The minimum torque measured when the nut just starts to rotate is the loosening torque. The bolt used to install the high-lock nut constitutes the test mandrel.

[0004] After assembly, only the working part of the high-lock nut remains. During the loosening torque test, the working part of the high-lock nut is tightened. In actual tests, calipers are usually used to clamp the working part of the high-lock nut on its outer circumference to apply a tightening torque. However, this method of applying tightening torque will cause the working part to deform due to the radial load generated by the calipers when clamping it. This is especially true for small nuts with thin walls. The deformation of the working part will change the force between the nut and the bolt, thus affecting the accuracy and reliability of the loosening torque test results. Summary of the Invention

[0005] The purpose of this invention is to provide a clamping fixture for testing the loosening torque of high-lock nuts, in order to solve the problem that the current method of tightening the working part of the high-lock nut by clamping it with calipers during the loosening torque test can easily deform the working part and affect the test results.

[0006] The technical solution of the clamping fixture for testing the loosening torque of high-locking nuts according to the present invention is as follows:

[0007] A clamping fixture for testing the loosening torque of a high-lock nut includes a first clamping body and a second clamping body. The first clamping body includes a first clamping portion, and the second clamping body includes a second clamping portion. Both the first and second clamping portions are provided with clearance channels for avoiding a test mandrel that mates with the test high-lock nut. The first and second clamping portions are spaced apart and opposite each other to clamp the working portion of the test high-lock nut on both axial sides. The first and / or second clamping bodies are provided with screwing engagement structures for mates with a screwing tool. The clamping fixture also includes a locking structure for relative movement of the first and second clamping portions.

[0008] Beneficial effects: The first and second clamping parts of the clamping fixture allow the test mandrel to be positioned on opposite axial sides of the working part of the test high-lock nut using the clearance channels. Then, the locking structure causes the first and second clamping parts to move relative to each other to clamp the test high-lock nut. By screwing the first and / or second clamping bodies, the working part of the test high-lock nut is rotated relative to the test mandrel to perform a loosening torque test. Since the first and second clamping bodies apply axial clamping force to the working part of the test high-lock nut, the original force between the working part and the mandrel can be avoided, which is beneficial to the accuracy and reliability of the test results of the high-lock nut loosening torque test.

[0009] Furthermore, the first clamping body is provided with a mounting cavity, and the second clamping part is located in the mounting cavity. The mounting cavity has a clamping cavity wall that is spaced apart from the second clamping part, and the clamping cavity wall constitutes the first clamping part.

[0010] Beneficial effect: The working part of the test high-lock nut and the second clamping part can be accommodated in the receiving cavity, which facilitates installation and operation.

[0011] Furthermore, the second clamping body also includes a push-fitting part connected to the second clamping part. The first clamping body is provided with a clearance hole for the push-fitting part to extend out of the first clamping body. The locking structure is a threaded push member threadedly connected to the first clamping body. The threaded push member is used to push the push-fitting part of the second clamping body to drive the second clamping body to move toward the first clamping part. The clearance hole is used to allow the push-fitting part to move away from the second clamping body.

[0012] Beneficial effect: The working part of the test high-lock nut is clamped by screwing the threaded pusher into the first clamping body and then pushing the pusher mating part of the second clamping body so that the second clamping part moves toward the first clamping part, which facilitates locking the first clamping body and the second clamping body together.

[0013] Furthermore, the first clamping body is provided with external threads, and the threaded pusher is a pusher nut that is threadedly connected to the external threads.

[0014] Beneficial effects: The first clamping body is provided with an external thread and a push nut is threadedly connected. The push nut facilitates the application of a uniform pushing force to the push mating part of the second clamping body and is easy to operate.

[0015] Furthermore, the clearance hole is a guide hole adapted to the push-fit part to guide the movement of the second clamping body.

[0016] Beneficial effects: By guiding the movement of the second clamping body, the second clamping part applies axial force only to the working part of the test high-lock nut, thus avoiding the threaded pusher from driving the second clamping body to rotate, thereby preventing the second clamping body from driving the working part of the test high-lock nut to rotate, which helps to ensure the position of the working part of the test high-lock nut.

[0017] Furthermore, the first clamping body includes a main body, which is a split structure. The main body includes a first split and a second split. The first split and the second split are respectively provided with mounting grooves to form a mounting cavity when the first split and the second split are mated. The first clamping body also includes a connecting nut. The external thread includes a first thread portion located on the first split and a second thread portion located on the second split. The first thread portion and the second thread portion are connected to allow the connecting nut to be threadedly connected to the main body.

[0018] Beneficial effects: The first and second parts are connected together by the connecting nut, which facilitates disassembly and assembly, and allows adjustment of the position of the connecting nut relative to the working part of the test high-lock nut.

[0019] Furthermore, the first clamping body includes a main body, which is a split structure. The main body includes a first split and a second split. The first split and the second split are respectively provided with mounting grooves to form a mounting cavity when the first split and the second split are docked.

[0020] Beneficial effect: The split structure makes it easy to install the working part of the test high-lock nut and the test bolt with the bolt head into the mounting cavity.

[0021] Furthermore, the thickness of the second clamping part is greater than the thickness of the pushing mating part.

[0022] Beneficial effect: It helps to improve the strength of the second clamping part to ensure reliable clamping of the working part of the test high-lock nut.

[0023] Furthermore, the first clamping body includes a cylindrical body, the bottom wall of which forms the first clamping part, and the inner cavity of the cylindrical body forms the mounting cavity.

[0024] Beneficial effect: The installation cavity is formed on the first clamping body by utilizing the inner cavity of the cylinder, which facilitates processing.

[0025] Furthermore, the first clamping part and / or the second clamping part are provided with a tapered protrusion, the tapered protrusion having a tip that presses against the end face of the working part.

[0026] Beneficial effect: By pressing the conical protrusion against the end face of the working part of the test high-lock nut, the friction between the clamping part and the working part of the test high-lock nut can be increased. Attached Figure Description

[0027] Figure 1 A schematic diagram of the assembly structure of the working part of the test high-lock nut and the test bolt;

[0028] Figure 2 for Figure 1 Side view;

[0029] Figure 3 This is a half-sectional schematic diagram of Embodiment 1 of the clamping fixture for testing the loosening torque of high-locking nuts according to the present invention;

[0030] Figure 4 for Figure 3 Side view;

[0031] Figure 5 for Figure 3 Exploded view;

[0032] Figure 6 for Figure 3 A schematic diagram of the structure of the first component in the diagram;

[0033] Figure 7 for Figure 6 Side view;

[0034] Figure 8 for Figure 3 A schematic diagram of the structure of the second component;

[0035] Figure 9 for Figure 8 Side view;

[0036] Figure 10 for Figure 3 A schematic diagram of the structure of the second clamping body;

[0037] Figure 11 for Figure 3 A cross-sectional view of the second clamping body in the middle;

[0038] Figure 12 This is a schematic diagram of the clamping fixture used in Example 1 of the present invention for testing the loosening torque of high-locking nuts.

[0039] In the diagram: 100, test bolt; 200, working part;

[0040] 1. First split part; 11. First threaded part; 12. First clearance groove; 13. First mounting groove; 14. First guide hole; 15. First wrench part; 2. Second split part; 21. Second threaded part; 22. Second clearance groove; 23. Second mounting groove; 24. Second guide hole; 25. Second wrench part; 3. Push nut; 4. Second clamping body; 41. Push mating part; 42. Second clamping part; 43. Second clearance channel; 5. Connecting nut; 6. Conical protrusion. Detailed Implementation

[0041] Example 1 of the clamping fixture for testing the loosening torque of high-locking nuts according to the present invention:

[0042] In this embodiment, the first and second clamping parts of the clamping fixture are used to clamp the working part of the test high-lock nut on both sides of the axial direction. Then, by screwing the first clamping body and / or the second clamping body, the working part of the test high-lock nut is driven to rotate relative to the test mandrel to conduct a loosening torque test. Since the first and second clamping bodies apply axial clamping force to the working part of the test high-lock nut, it can avoid affecting the original force between the working part and the mandrel, which is conducive to the accuracy and reliability of the test results of the high-lock nut loosening torque test.

[0043] Specifically, such as Figure 1-12 As shown, the clamping fixture used for the high locking nut loosening torque test includes a first clamping body, a second clamping body 4, and a locking structure. The first clamping body includes a main body and a connecting nut 5. The main body includes a first split body 1 and a second split body 2. The locking structure is a threaded pusher, and the threaded pusher is a pusher nut 3.

[0044] The main body of the first clamping body is a cylindrical body, which is formed by the combination of a first part 1 and a second part 2. The first part 1 and the second part 2 are in a semi-circular ring shape. The first part 1 and the second part 2 are opposite each other along the radial direction of the cylindrical body. The first part 1 is provided with a first mounting groove 13 with the groove opening facing downwards, and the second part 2 is provided with a second mounting groove 23 with the groove opening facing upwards. The first mounting groove 13 and the second mounting groove 23 are used to form the inner cavity of the cylindrical body, and the inner cavity of the cylindrical body constitutes the mounting cavity.

[0045] The first split part 1 has a first wrench 15 at its left end and a first stop at its right end. The first stop has a first clearance groove 12 with its opening facing downwards. The second split part 2 has a second wrench 25 at its left end and a second stop at its right end. The second stop has a second clearance groove 22 with its opening facing upwards. The first stop and the second stop are used to connect to form the bottom wall of the cylinder. The bottom wall of the cylinder forms the clamping cavity wall of the mounting cavity. The clamping cavity wall forms the first clamping part. The first clearance groove 12 and the second clearance groove 22 are used to form clearance holes provided on the bottom wall of the cylinder. The clearance holes on the bottom wall of the cylinder form clearance channels on the first clamping part. The split structure makes it easy to install the working part 200 of the test high-lock nut and the test bolt 100 with the bolt head into the mounting cavity. The clearance channel on the first clamping part is used to allow the test bolt 100 to extend out of the mounting cavity.

[0046] The first wrench part 15 and the second wrench part 25 are joined together to form a hexagonal head. The hexagonal head is located at the opening of the cylinder. The outer contour of the opening part of the cylinder is hexagonal. The hexagonal head forms a screw-tightening fit structure so that the screwing tool directly applies force to the main body and drives the first clamping body to rotate.

[0047] The outer circumferential surface of the first clamping body is provided with external threads. The external threads include a first threaded portion 11 located on the first part 1 and a second threaded portion 21 located on the second part 2. The first threaded portion 11 and the second threaded portion 21 are connected in the helical direction of the external threads to form a complete thread for the connecting nut 5 to be threaded onto the main body. The first part 1 and the second part 2 are connected together by the connecting nut 5, which facilitates disassembly and assembly, and at the same time allows adjustment of the position of the connecting nut 5 relative to the working part 200 of the test high-lock nut.

[0048] The second clamping body 4 includes a second clamping part 42 and a push-fitting part 41. The second clamping part 42 is an annular part. On the radially opposite sides of the annular part, there are square protrusions extending radially along the annular part. The square protrusions constitute the push-fitting part 41. The central hole of the annular part constitutes a second clearance channel 43. The second clearance channel 43 is used to avoid the end of the test bolt 100 that is away from the bolt head. The test bolt 100 constitutes a test mandrel.

[0049] The second clamping part 42 is located in the inner cavity of the cylinder and is adapted to the inner cavity of the cylinder. The first part 1 and the second part 2 are respectively provided with a first guide hole 14 and a second guide hole 24 for the push-fitting part 41 on both radial sides of the second clamping part 42 to extend out. The first guide hole 14 and the second guide hole 24 are both square elongated holes extending along the axial direction of the cylinder, so that the second clamping body 4 can move left and right, and guide the push-fitting part 41 when the second clamping body 4 moves. The second clamping part 42 is opposite to the bottom wall of the cylinder. After the working part 200 of the test high-lock nut is inserted between the first clamping body and the second clamping body 4, the first clamping part and the second clamping part 42 are moved toward the first clamping part to clamp the working part 200 on both axial sides of the working part 200 of the test high-lock nut. The first clamping part and the second clamping part 42 apply axial force to the axial end faces of the working part 200 on both axial sides of the working part 200, so that the first clamping body, the second clamping body 4 and the working part 200 are fixed together, while the first clamping body and the second clamping body 4 do not apply force to the test bolt 100.

[0050] The push nut 3 is threaded onto the external thread of the first clamping body. The push nut 3 and the connecting nut 5 are respectively connected to the left and right ends of the external thread. The push mating part 41 of the second clamping body 4 is located between the push nut 3 and the connecting nut 5. The push mating part 41 protrudes from the cylinder body and is used to engage with the push nut 3 so that when the push nut 3 is screwed on, it drives the second clamping body 4 to move toward the first clamping part. By screwing the push nut 3 onto the external thread of the first clamping body, the push mating part 41 of the second clamping body 4 is pushed, causing the second clamping part 42 to move toward the first clamping part, thereby clamping the working part 200 of the test high-lock nut. This facilitates locking the first clamping body and the second clamping body 4 together to clamp the working part 200. The second clamping body 4 guides the movement of the second clamping part 42, ensuring that it applies axial force only to the working part 200 of the test high-lock nut, thus preventing the pushing nut 3 from causing the second clamping body 4 to rotate. This, in turn, prevents the second clamping body 4 from causing the working part 200 of the test high-lock nut to rotate, which helps to ensure the position of the working part 200 of the test high-lock nut. The thickness of the second clamping part 42 is greater than the thickness of the pushing mating part 41, and the thickness direction is left and right, which helps to improve the strength of the second clamping part 42 to ensure reliable clamping of the working part 200 of the test high-lock nut.

[0051] The first clamping part is provided with conical protrusions 6, which are evenly distributed along the circumference. Each conical protrusion has a pointed tip that presses against the end face of the working part 200, while avoiding the tip pressing against the thread of the working part 200. The conical protrusions 6 are conical in shape, which can increase the friction between the clamping part and the working part 200 of the test high-lock nut, ensuring a stable clamping.

[0052] In use, place the working part 200 of the test high-lock nut along with the test bolt 100 in the second mounting groove 23 of the second part 2, place the second clamping body 4 on top, and then close the first part 1 and the second part 2. Connect the connecting nut 5 and the push nut 3 to the cylindrical body formed by the first part 1 and the second part 2. Screw the push nut 3 into the complete thread formed by the first part 1 and the second part 2, so that the second clamping part 42 contacts the working part 200 of the test high-lock nut until the second clamping part 42 cooperates with the first clamping part to clamp the working part 200. Check the test bolt 100 to ensure that the test bolt 100 does not contact the clamping fixture, and then test the loosening torque. Apply force to the tightening structure with a tightening tool to drive the working part 200 to rotate relative to the test bolt 100. The test bolt can be fixed with a corresponding tool.

[0053] This clamping fixture can effectively fix the assembled high-strength lock nuts, thereby enabling the loosening torque test of the assembled high-strength lock nuts. It can perform loosening torque tests on shear-resistant high-strength lock nuts and tensile high-strength lock nuts.

[0054] Example 2 of the clamping fixture for testing the loosening torque of high-locking nuts in this invention:

[0055] This embodiment provides a different first clamping body configuration than Embodiment 1. The difference lies in that, in Embodiment 1, the first clamping body has a mounting cavity, and the second clamping part is located within the mounting cavity. The mounting cavity has clamping cavity walls that are spaced apart from the second clamping part, and these clamping cavity walls constitute the first clamping part. In this embodiment, the first clamping body is a ring, comprising an upper part and a lower part, which are connected together by bolts. The first and second clamping bodies are spaced apart horizontally. The locking structure includes locking bolts that connect the first and second clamping bodies together. Multiple locking bolts are provided along the circumference. One of the first and second clamping bodies has a through hole for the locking bolts to pass through, and the other has a threaded hole for the locking bolts to be threaded.

[0056] Example 3 of the clamping fixture for testing the loosening torque of high-locking nuts in this invention:

[0057] This embodiment provides a different first clamping body configuration than Embodiment 1. The difference lies in that, in Embodiment 1, the first clamping body has external threads, and the locking structure includes a push nut threaded onto the external threads. The second clamping body also includes a push-fitting part connected to the second clamping part. The external threads have clearance holes for the push-fitting part to extend out of the first clamping body. The push-fitting part engages with the push nut to move the second clamping body towards the first clamping part when the push nut is tightened. The clearance holes allow the push-fitting part to move away from the second clamping body. In this embodiment, the first clamping body has internal threads, and the second clamping body has external threads. The second clamping body is threaded into the mounting cavity of the first clamping body.

[0058] Example 4 of the clamping fixture for testing the loosening torque of high-locking nuts in this invention:

[0059] This embodiment provides a first clamping body configuration different from that of Embodiment 1. The difference between this embodiment and Embodiment 1 is that, in Embodiment 1, the clearance hole on the first clamping body that avoids the pushing engagement part is a guide hole to guide the movement of the second clamping body. In this embodiment, however, the movement of the second clamping body is not guided, and the pushing engagement part and the clearance hole are spaced apart on the two side walls of the cylinder in the circumferential direction.

[0060] Example 5 of the clamping fixture for testing the loosening torque of high-locking nuts in this invention:

[0061] This embodiment provides a second clamping body configuration different from that of Embodiment 1. The difference between this embodiment and Embodiment 1 is that the thickness of the second clamping part in Embodiment 1 is greater than the thickness of the pushing mating part. In this embodiment, however, the thickness of the second clamping part is the same as the thickness of the pushing mating part.

[0062] Example 6 of the clamping fixture for testing the loosening torque of high-locking nuts in this invention:

[0063] This embodiment provides a different first clamping body configuration than Embodiment 1. The difference between this embodiment and Embodiment 1 is that the first clamping body in Embodiment 1 includes a cylindrical body, the bottom of which forms the first clamping part, and the inner cavity of the cylindrical body forms the mounting cavity. In this embodiment, the first clamping body is a hollow cylinder, and the mounting cavity of the first clamping body has two opposing side walls.

[0064] Example 7 of the clamping fixture for testing the loosening torque of high-locking nuts in this invention:

[0065] This embodiment provides a different first clamping body configuration than Embodiment 1. The difference between this embodiment and Embodiment 1 is that the first clamping part in Embodiment 1 has a conical protrusion with a pointed tip that presses against the end face of the working part. In this embodiment, however, there is no conical protrusion, and the bottom surface of the cylinder is flat, through which the first clamping part contacts the working part.

[0066] Example 8 of the clamping fixture for testing the loosening torque of high-locking nuts in this invention:

[0067] This embodiment provides a different first clamping body configuration than Embodiment 1. The difference lies in that the first clamping body in Embodiment 1 includes a main body, which is a split structure comprising a first split and a second split. The first and second splits are respectively provided with mounting grooves to form a mounting cavity when they are joined together. In this embodiment, however, the main body is a one-piece structure, and the outer diameter of the bolt head of the corresponding test bolt is not greater than the outer diameter of the threaded section.

[0068] Example 9 of the clamping fixture for testing the loosening torque of high-locking nuts in this invention:

[0069] This embodiment provides a different first clamping body configuration than Embodiment 1. The difference lies in that the first clamping body in Embodiment 1 further includes a connecting nut, and the main body has external threads. These external threads include a first threaded portion located on the first segment and a second threaded portion located on the second segment, with the first and second threaded portions engaging to allow the connecting nut to be threaded onto the main body. In this embodiment, however, the first and second segments each have connecting ears with bolt holes to allow the first and second segments to be fixedly connected by bolts.

[0070] Example 10 of the clamping fixture for testing the loosening torque of high-locking nuts in this invention:

[0071] This embodiment provides a different screw-fit structure configuration than Embodiment 1. The difference between this embodiment and Embodiment 1 is that the screw-fit structure in Embodiment 1 is located on the main body. In this embodiment, the main body is provided with a stop ring platform. After the connecting nut is threaded onto the main body, it is pressed against the stop ring platform, and the connecting nut constitutes a screw-fit structure.

[0072] Example 11 of the clamping fixture for testing the loosening torque of high-locking nuts in this invention:

[0073] This embodiment provides a different threaded pusher configuration than Embodiment 1. The difference between this embodiment and Embodiment 1 is that the threaded pusher in Embodiment 1 is a pusher nut. In this embodiment, the left end of the first clamping body is provided with a flange, and a set screw is threadedly connected to the flange. The set screw constitutes a threaded pusher for pushing the pusher engagement part of the second clamping body.

[0074] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A clamping fixture for testing the loosening torque of high-locking nuts, characterized in that, The clamping fixture includes a first clamping body and a second clamping body. The first clamping body includes a first clamping portion, and the second clamping body includes a second clamping portion. Both the first and second clamping portions are provided with clearance channels to avoid the test mandrel that mates with the test high-lock nut. The first and second clamping portions are spaced apart and opposite to each other to clamp the working part of the test high-lock nut on both axial sides. The first and / or second clamping bodies are provided with screwing engagement structures for mates with screwing tools. The clamping fixture also includes a locking structure for relative movement between the first and second clamping portions. A clamping body has a mounting cavity, and a second clamping part is located in the mounting cavity. The mounting cavity has a clamping cavity wall that is spaced apart from the second clamping part. The clamping cavity wall constitutes the first clamping part. The second clamping body also includes a push-fitting part connected to the second clamping part. The first clamping body has a clearance hole for the push-fitting part to extend out of the first clamping body. The locking structure is a threaded pusher connected to the first clamping body. The threaded pusher is used to push the push-fitting part of the second clamping body to drive the second clamping body to move toward the first clamping part. The clearance hole is used to allow the push-fitting part to move away when the second clamping body moves.

2. The clamping fixture for testing the loosening torque of high-locking nuts according to claim 1, characterized in that, The first clamping body is provided with an external thread, and the threaded pusher is a pusher nut that is threadedly connected to the external thread.

3. The clamping fixture for testing the loosening torque of high-locking nuts according to claim 1 or 2, characterized in that, The clearance hole is a guide hole adapted to the push-fit part to guide the movement of the second clamping body.

4. The clamping fixture for testing the loosening torque of high-locking nuts according to claim 2, characterized in that, The first clamping body includes a main body, which is a split structure. The main body includes a first split and a second split. The first split and the second split are respectively provided with mounting grooves to form a mounting cavity when the first split and the second split are mated. The first clamping body also includes a connecting nut. The external thread includes a first threaded portion located on the first split and a second threaded portion located on the second split. The first threaded portion and the second threaded portion are connected to allow the connecting nut to be threadedly connected to the main body.

5. The clamping fixture for testing the loosening torque of high-locking nuts according to claim 1 or 2, characterized in that, The first clamping body includes a main body, which is a split structure. The main body includes a first split and a second split. The first split and the second split are respectively provided with mounting grooves to form a mounting cavity when the first split and the second split are connected.

6. The clamping fixture for testing the loosening torque of high-locking nuts according to claim 1 or 2, characterized in that, The thickness of the second clamping part is greater than the thickness of the pushing mating part.

7. The clamping fixture for testing the loosening torque of high-locking nuts according to claim 1 or 2, characterized in that, The first clamping body includes a cylinder, the bottom wall of which forms the first clamping part, and the inner cavity of the cylinder forms the mounting cavity.

8. The clamping fixture for testing the loosening torque of high-locking nuts according to claim 1 or 2, characterized in that, The first clamping part and / or the second clamping part are provided with a tapered protrusion, the tapered protrusion having a tip that presses against the end face of the working part.

Images