Self-locking drum type core-pulling rivet fatigue test tool

Abstract

This utility model relates to the field of rivet fatigue testing technology, specifically a fatigue testing fixture for a self-locking drum-shaped pull-core rivet. It includes a connecting assembly comprising two symmetrical T-shaped connecting blocks, each with an internal mounting hole. An adjusting assembly is located outside the two connecting assemblies. The adjusting assembly includes two slidably fitted sleeves on the outer surfaces of the T-shaped connecting blocks. A screw is fixedly mounted on one side of each sleeve, and a bidirectional threaded sleeve is screwed onto the outer sides of the two screws. An extension plate is fixedly mounted at one end of the outer surface of each T-shaped connecting block, and a thickened washer is movably fitted onto the outer side of the extension plate. In this utility model, by installing a rivet between two T-shaped connecting blocks and connecting the two sets of T-shaped connecting blocks through two adjusting assemblies, the riveting spacing of the two rivets can be adjusted, enabling the fatigue testing machine to detect the influence of different riveting spacings on fatigue strength and improving the accuracy of fatigue testing results.

Description

Technical Field

[0001] This utility model relates to the field of rivet fatigue testing technology, specifically a fatigue testing fixture for a self-locking drum-shaped pull-out rivet. Background Technology

[0002] Blind rivets are a commonly used type of fastener. Their structure includes a rivet body and a rivet core embedded in the rivet body. The rivet core usually has a rivet head, which is larger than the rivet body. With the development of blind rivets, various types of rivets have emerged, including self-locking drum-shaped blind rivets. The quality of self-locking drum-shaped blind rivets is very important. Therefore, self-locking drum-shaped blind rivets require reliable inspection to ensure their quality, including fatigue testing.

[0003] Existing fatigue tests for blind rivets typically involve clamping both ends of the rivet directly and conducting a tensile test using a fatigue testing machine. However, in actual use, the rivet is subjected to forces transmitted from the connected plates, placing it under a combined shear and compressive stress state. Clamping both ends of the rivet makes it difficult to accurately detect the fatigue strength of the rivet in actual applications, nor is it convenient to detect the comprehensive impact of different riveting spacings on fatigue strength, resulting in inaccurate fatigue test results for the rivet. Utility Model Content

[0004] The purpose of this invention is to provide a fatigue testing fixture for a self-locking drum-shaped core-pulling rivet, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A fatigue testing fixture for a self-locking drum-shaped pull rivet includes:

[0007] A connecting component, comprising two symmetrical T-shaped connecting blocks, wherein each T-shaped connecting block has an internal mounting hole;

[0008] An adjustment component is disposed on the outside of the two sets of connecting components. The adjustment component includes two slidable sleeves that are fitted onto the outer surface of the T-shaped connecting block. A screw is fixedly installed on one side surface of the sleeve, and a bidirectional threaded sleeve is screwed onto the outer side of the two screws.

[0009] Furthermore, an extension plate is fixedly installed at one end of the outer surface of the T-shaped connecting block, and a thickened gasket is movably sleeved on the outer side of the extension plate.

[0010] Furthermore, a connecting hole is provided at the lower end of the mounting hole, the connecting hole penetrates the T-shaped connecting block, and a rivet is connected between the two corresponding connecting holes.

[0011] Furthermore, the outer side of the bidirectional threaded sleeve is rotatably connected to a limiting ring, and a T-shaped locking block is fixedly installed on the upper end of the limiting ring.

[0012] Preferably, hexagonal collars are symmetrically fixedly installed on the outer surface of the bidirectional threaded sleeve on both sides of the limiting ring.

[0013] Preferably, each of the card sleeves has a sliding sleeve symmetrically fixedly installed on one side surface, and each of the T-shaped card blocks has a sliding rod symmetrically fixedly installed on one side surface.

[0014] Preferably, the slide rod is slidably inserted into two sliding sleeves at corresponding positions.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. By fixing the rivet between two connecting holes, the two T-shaped connecting blocks are connected and fixed. When measuring the effect of different rivet distances on the fatigue strength of the rivet, the two sets of connecting components connecting the rivets are clamped inside the sleeves of the two sets of adjusting components. Rotating the bidirectional threaded sleeve causes the two screws to drive the two sleeves to move towards each other, adjusting the distance between the two rivets. Thus, the riveting spacing of the two rivets is adjusted through the two adjusting components, enabling the fatigue testing machine to detect the effect of different riveting spacings on fatigue strength and improving the accuracy of fatigue testing results.

[0017] 2. By installing thickened shims of different thicknesses on the outer side of the extension plate, the riveting depth of the rivets is changed, and the influence of different depths on the minor fatigue of the rivets is detected. At the same time, when detecting the rivet distance, the influence of different riveting depths on the minor fatigue of rivets with different riveting distances can also be detected, further improving the test results. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the disassembled structure of the adjustment component and the T-shaped connecting block in this utility model;

[0020] Figure 3 This is a schematic diagram of the vertical cross-sectional structure of the adjustment component in this utility model;

[0021] Figure 4 This is a cross-sectional structural diagram of the connecting component in this utility model.

[0022] In the diagram: 1. Connecting assembly; 101. T-shaped connecting block; 102. Mounting hole; 103. Outer plate; 104. Thickened gasket; 105. Rivet; 106. Connecting hole; 2. Adjusting assembly; 201. Sleeve; 202. Screw; 203. Bidirectional threaded sleeve; 204. Hexagonal collar; 205. Limiting ring; 206. T-shaped locking block; 207. Sliding rod; 208. Sliding sleeve. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-4 In this embodiment of the present invention, a fatigue testing fixture for a self-locking drum-shaped pull rivet includes a connecting component 1. The connecting component 1 includes two symmetrical T-shaped connecting blocks 101. The T-shaped connecting blocks 101 have mounting holes 102 inside. An adjusting component 2 is disposed on the outside of the two connecting components 1. The adjusting component 2 includes two sleeves 201 that are slidably sleeved on the outer surface of the T-shaped connecting blocks 101. A screw 202 is fixedly installed on one side surface of the sleeve 201. A bidirectional threaded sleeve 203 is screwed onto the outside of the two screws 202.

[0025] Specifically, when rivet 105 is installed between two T-shaped connecting blocks 101 and connected to the fatigue testing machine using a single set of connecting components 1, the fatigue strength of a single rivet 105 is tested. When two sets of connecting components 1 are connected to the fatigue testing machine through adjusting component 2, the influence of different rivet distances on the fatigue strength of rivet 105 in actual use is tested, thereby improving the accuracy of the experimental results.

[0026] Example 1

[0027] like Figure 4 As shown, in this embodiment, a connecting hole 106 is provided at the lower end of the mounting hole 102. The connecting hole 106 passes through the T-shaped connecting block 101, and a rivet 105 is connected between the two corresponding connecting holes 106.

[0028] In this embodiment, the mounting hole 102 is a conical structure to facilitate the insertion of the gun head. Then, the rivet 105 is fixed between the two connecting holes 106 to connect and fix the two T-shaped connecting blocks 101. Then, the T-shaped connecting blocks 101 are inserted into the slot of the fatigue testing machine chuck. The fatigue strength of the rivet 105 is tested by stretching the two T-shaped connecting blocks 101 through the fatigue testing machine. Different shapes of T-shaped connecting blocks 101 and T-shaped locking blocks 206 are replaced according to the shape of the slot of the fatigue testing machine chuck so that both can be quickly connected to the fatigue testing machine.

[0029] like Figure 2 and Figure 3As shown, in this embodiment, a limiting ring 205 is rotatably connected to the outer side of the bidirectional threaded sleeve 203, and a T-shaped locking block 206 is fixedly installed on the upper end of the limiting ring 205; hexagonal collars 204 are symmetrically fixedly installed on the outer surface of the bidirectional threaded sleeve 203 on both sides of the limiting ring 205. The hexagonal collars 204 make it easier for the bidirectional threaded sleeve 203 to rotate, and at the same time, the hexagonal collars 204 are locked at both ends of the limiting ring 205 to limit the position of the bidirectional threaded sleeve 203.

[0030] In specific implementation, when measuring the effect of different riveting distances on the fatigue strength of rivets 105, the two sets of connecting components 1 connecting rivets 105 are locked inside the sleeves 201 of the two sets of adjusting components 2. The hexagonal collar 204 is rotated, causing the bidirectional threaded sleeve 203 to rotate. Through the engagement connection between the bidirectional threaded sleeve 203 and the two screws 202, under the sliding limit of the slide rod 207 and the slide sleeve 208, the two screws 202 drive the two sleeves 201 to move towards each other, adjusting the distance between the two rivets 105. Thus, the riveting distance of the two rivets 105 is adjusted through the two adjusting components 2, enabling the fatigue testing machine to detect the effect of different riveting distances on fatigue strength, detect the fatigue strength at different riveting distances, and improve the accuracy of fatigue testing results.

[0031] like Figure 2 and Figure 3 As shown, in this embodiment, sliding sleeves 208 are symmetrically fixedly installed on one side surface of the sleeve 201, and sliding rods 207 are symmetrically fixedly installed on one side surface of the T-shaped block 206; the sliding rods 207 are slidably inserted into the two sliding sleeves 208 at the corresponding positions.

[0032] In practice, the sliding connection between the slide rod 207 and the sliding sleeve 208 increases the connection strength between the T-shaped block 206 and the sleeve 201, while limiting the movement of the sleeve 201.

[0033] Example 2

[0034] Based on Example 1, in order to solve the problem of the difficulty in detecting the fatigue strength of rivets at different riveting depths.

[0035] like Figure 4 As shown, in this embodiment, an extension plate 103 is fixedly installed at one end of the outer surface of the T-shaped connecting block 101, and a thickened gasket 104 is movably sleeved on the outer side of the extension plate 103.

[0036] In specific implementation, by fitting thickened shims 104 of different thicknesses on the outer side of the extension plate 103, the riveting thickness of the rivet 105 is changed, and the influence of different thicknesses on the fatigue strength of the rivet 105 is detected. At the same time, when detecting the riveting distance, a longer thickened shim 104 can be fitted on the outer side of the extension plate 103 in the same direction of the two sets of connecting components 1 to detect the influence of different riveting depths on the fatigue strength of the rivet 105 with different riveting distances, thereby further improving the test results.

[0037] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fatigue testing fixture for a self-locking drum-shaped pull rivet, characterized in that, include: A connecting component (1) includes two symmetrical T-shaped connecting blocks (101), and the T-shaped connecting blocks (101) have mounting holes (102) inside; An adjustment component (2) is disposed on the outside of two sets of connecting components (1). The adjustment component (2) includes two sleeves (201) that are slidably sleeved on the outer surface of the T-shaped connecting block (101). A screw (202) is fixedly installed on one side surface of the sleeve (201), and a bidirectional threaded sleeve (203) is screwed onto the outside of the two screws (202).

2. The fatigue testing fixture for the self-locking drum-shaped pull rivet according to claim 1, characterized in that, An extension plate (103) is fixedly installed at one end of the outer surface of the T-shaped connecting block (101), and a thickened gasket (104) is movably sleeved on the outer side of the extension plate (103).

3. The fatigue testing fixture for the self-locking drum-shaped pull rivet according to claim 1, characterized in that, The mounting hole (102) has a connecting hole (106) at its lower end. The connecting hole (106) passes through the T-shaped connecting block (101), and a rivet (105) is connected between the two corresponding connecting holes (106).

4. The fatigue testing fixture for the self-locking drum-shaped pull rivet according to claim 1, characterized in that, The outer side of the bidirectional threaded sleeve (203) is rotatably connected to a limiting ring (205), and a T-shaped locking block (206) is fixedly installed on the upper end of the limiting ring (205).

5. The fatigue testing fixture for the self-locking drum-shaped pull rivet according to claim 4, characterized in that, The outer surface of the bidirectional threaded sleeve (203) is symmetrically fixed with hexagonal collars (204) on both sides of the limiting ring (205).

6. The fatigue testing fixture for the self-locking drum-shaped pull rivet according to claim 4, characterized in that, Each of the card sleeves (201) has a sliding sleeve (208) symmetrically fixedly installed on one side surface, and each of the T-shaped card blocks (206) has a sliding rod (207) symmetrically fixedly installed on one side surface.

7. The fatigue testing fixture for the self-locking drum-shaped pull rivet according to claim 6, characterized in that, The slide rod (207) is slidably inserted into the two sliding sleeves (208) at the corresponding positions.

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