A core-pulling rivet tension load test inspection auxiliary device

Abstract

The utility model belongs to the technical field of core-pulling rivet tension load test and relates to an auxiliary device for testing the tension load of a core-pulling rivet. When testing, the tested core-pulling rivet is used to connect the upper assembly and the lower assembly of the auxiliary device, and the testing device applies a tensile load to the clamping portions at both ends of the auxiliary device through a clamp, thereby testing the tensile strength of the core-pulling rivet. When testing different types of core-pulling rivets, only the rivet plate with the corresponding hole size needs to be replaced to complete the test. For core-pulling rivets with special sizes, only the corresponding special-size holes need to be opened on the bottom surface of the rivet plate to complete the test. In addition, the operator can also observe the deformation of the core-pulling rivet during the test through the open position of the device, thereby providing a basis for stress analysis and structure optimization. The auxiliary device has the advantages of not needing to damage the finished product during testing, not needing to replace or customize the clamp of the testing device, simple operation, low cost, and wide adaptability.

Description

Technical Field

[0001] This utility model belongs to the field of tensile load testing technology for pop rivets, and in particular relates to an auxiliary device for testing and inspecting the tensile load of pop rivets. Background Technology

[0002] Blind rivets are commonly used fasteners whose core function is to permanently connect two or more components through a simple riveting process. They are widely used in automobile manufacturing, construction, and other fields. The tensile strength of blind rivets is closely related to the stability and safety of the finished components. For example, to ensure the stability and reliability of the electrical cabinet frame connection in rail transit vehicles, testing the tensile strength of the blind rivets used in the electrical cabinet is an indispensable step before assembling the electrical cabinet.

[0003] Taking electrical cabinets as an example, traditional blind rivet tensile load testing requires cutting the electrical cabinet panels to create simulated samples, which is destructive to the finished components. During testing, the electrical cabinet panels and blind rivets need to be fixed with special fixtures. To ensure the accuracy of the test results, the fixtures need to be in close contact with the blind rivets. Therefore, different sizes of fixtures are often required for testing different types of blind rivets. Frequent fixture changes not only increase operating costs, but also require specially customized fixtures for special types of blind rivets, making the testing operation complex and increasing the testing cost.

[0004] Therefore, a new technical solution is urgently needed among existing technologies to solve this problem. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an auxiliary device for testing the tensile load of blind rivets, which solves the technical problem that traditional blind rivet tensile load testing requires destroying finished parts and the testing device cannot be applied to different types of blind rivets.

[0006] An auxiliary device for testing the tensile load of a blind rivet includes an upper component and a lower component. The upper and lower components have identical structures, each including a top plate and a rivet plate. The top plate is a box structure formed by two symmetrically arranged long sides, two symmetrically arranged short sides, and a top surface. Anti-crack holes are provided at the four corners of the top plate, and a top plate clamping part is fixedly connected to the top of the top plate. A top plate connecting hole is provided on the long side of the top plate. The rivet plate is formed by two symmetrically arranged long sides... The box structure is formed by the short sides and bottom surfaces of two symmetrically arranged rivet plates. Crack-prevention holes are provided at the four corners of the rivet plates. A rivet plate rivet hole is provided at the geometric center of the bottom surface of the rivet plate, and a rivet plate connection hole is provided on the long side surface of the rivet plate. The rivet plate is placed in the box space of the top plate, and the rivet plate and the top plate are connected by detachable fasteners that pass through the top plate connection hole and the rivet plate connection hole. The upper component and the lower component are arranged in a mirror image with respect to the bottom surface of the rivet plate and are fixedly connected by blind rivets that pass through the rivet plate rivet holes.

[0007] This utility model provides an auxiliary device for testing and inspecting the tensile load of a pull-out rivet. The resultant force generated by the detachable fastener in the vertical direction is perpendicular to the bottom surface of the rivet plate and passes through the geometric center of the bottom surface of the rivet plate.

[0008] This utility model relates to an auxiliary device for testing and inspecting the tensile load of a pull-out rivet, wherein the diameter of the anti-crack hole 3 is twice the thickness of the plate.

[0009] Through the above design scheme, this utility model can bring the following beneficial effects:

[0010] When performing tensile load tests on blind rivets, the top plate and rivet plate of each component are fixedly connected using detachable fasteners. The blind rivet to be tested is then used to connect the upper and lower components of this auxiliary device. The testing device can then apply tensile loads to the clamping parts at both ends of the auxiliary device to test the tensile strength of the blind rivet. Since the blind rivet is fixed to the rivet plate, there is no need to damage the finished part. Furthermore, the opening on the bottom surface of the rivet plate is located at the geometric center of that surface, preventing eccentric force when applying tensile loads, further improving the accuracy of the test results. When testing different types of blind rivets, only the rivet plate with the corresponding opening size needs to be replaced. For blind rivets of special sizes, only a special-sized opening needs to be made on the bottom surface of the rivet plate. There is no need to replace or customize the fixtures of the testing device, greatly reducing testing operation costs and labor costs, and improving testing efficiency. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0012] Figure 1 This is a schematic diagram of the overall structure of the auxiliary device for testing and inspecting the tensile load of a pull-out rivet according to this utility model.

[0013] Figure 2 This is a perspective view of the top plate of an auxiliary device for testing and inspecting the tensile load of a pull-out rivet according to this utility model.

[0014] Figure 3 This is a plan view of the rivet plate of the auxiliary device for testing and inspecting the tensile load of a blind rivet according to this utility model.

[0015] In the figure, 1-top plate, 2-rivet plate, 3-crack-stopping hole, 101-long side of top plate, 102-short side of top plate, 103-top surface of top plate, 104-clamping part of top plate, 105-connecting hole of top plate, 201-long side of rivet plate, 202-short side of rivet plate, 203-bottom surface of rivet plate, 204-rivet hole of rivet plate, 205-connecting hole of rivet plate. Detailed Implementation

[0016] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0017] like Figure 1 The illustrated auxiliary device for testing the tensile load of a blind rivet comprises an upper component and a lower component. Each component includes a top plate 1 and a rivet plate 2. The top plate 1 is a box structure, the perspective view of which is shown below. Figure 2 As shown. The top plate 1 is formed by two symmetrically arranged long side surfaces 101, two symmetrically arranged short side surfaces 102, and a top surface 103. Crack-stopping holes 3 are provided at the four corners of the top plate 1 to prevent stress concentration and damage during tensile load tests, thus improving the durability of this auxiliary device. The diameter of the crack-stopping holes 3 is preferably twice the thickness of the plate material used. A top plate clamping part 104 is fixedly connected to the top of the top plate 1. To facilitate clamping, the top plate clamping part 104 is preferably a plate-shaped structure and can be fixedly connected to the outer surface of the top surface 103 of the top plate by welding or other methods. The welding position should be such that the tensile force applied by the clamp to this device is perpendicular to the bottom surface 203 of the rivet plate and passes through the geometric center of the bottom surface 203 of the rivet plate. A top plate connecting hole 105 is provided on the long side surface 101 of the top plate.

[0018] This auxiliary device also includes a rivet plate 2, which is also a box structure, as shown in the unfolded diagram below. Figure 3As shown. The rivet plate 2 is formed by two symmetrically arranged long sides 201, two symmetrically arranged short sides 202, and a bottom surface 203. Anti-crack holes 3 are provided at the four corners of the rivet plate 2. The preferred diameter and function of the anti-crack holes 3 are the same as described above, and will not be repeated here. A rivet hole 204 is provided at the geometric center of the bottom surface 203. To accommodate different types of blind rivets, the diameter of the rivet hole 204 can be adjusted according to specific circumstances, preferably 2.7mm, 4.2mm, and 6.8mm. A rivet connecting hole 205 is provided on the long side 201 of the rivet plate. The diameter of the rivet connecting hole 205 is the same as the diameter of the top plate connecting hole 105, preferably 5.2mm.

[0019] When installing this auxiliary device, the rivet 2 is placed within the housing space of the top plate 1, with the outer surface of the long side 201 of the rivet 2 fitting against the inner surface of the long side 101 of the top plate. The top plate 1 and the rivet 2 are connected by detachable fasteners passing through the top plate connection hole 105 and the rivet connection hole 205. The resultant force generated by the detachable fasteners in the vertical direction is perpendicular to the bottom surface 203 of the rivet 203 and passes through the geometric center of the bottom surface 203 of the rivet 203. Preferably, there are two top plate connection holes 105 and two rivet connection holes 205, and the detachable fasteners are preferably hexagonal stainless steel bolts. After connection, the top plate 1 and the rivet 2 form the upper component of this device. The lower component of this device has the same structure as the upper component and is arranged in a mirror image of the upper component relative to the bottom surface 203 of the rivet 203. The upper component and the lower component of this device are fixedly connected by blind rivets passing through the rivet hole 204 of the rivet 205.

[0020] The working principle of this utility model is as follows:

[0021] When conducting a tensile load test on a blind rivet, the top plate 1 and rivet plate 2 are fixedly connected using fastening bolts. The blind rivet to be tested is then used to connect the upper and lower components of this auxiliary device. To ensure a tight connection between the top plate 1 and rivet plate 2, the tightening torque is generally not less than 4.5 Nm, and an anti-loosening mark is applied after tightening. To ensure the accuracy of the test, the material of rivet plate 2 should be the same as the material of the finished part to be connected by the blind rivet. During the test, the clamps of the testing device hold the top plate clamping parts 104 at both ends. As a tensile load is applied, the blind rivet to be tested and its connected rivet plate 2 will deform until it is destroyed, thus determining the tensile load of the blind rivet. When testing different types of blind rivets, simply replace the rivet plate 2 with one having the corresponding opening size on its bottom surface. For blind rivets of special sizes, only a special-sized opening needs to be made on rivet plate 2; there is no need to replace or customize the testing device's clamps. This invention has the advantages of simple operation, low cost and wide adaptability. At the same time, during the test, the operator can observe the deformation of the blind rivet through the open space formed by the short side 102 of the top plate and the short side 202 of the rivet plate, which provides an empirical basis for stress analysis and structural optimization.

Claims

1. An auxiliary device for testing and inspecting the tensile load of a blind rivet, characterized in that: The assembly includes an upper component and a lower component. The upper and lower components have the same structure, both including a top plate (1) and a rivet plate (2). The top plate (1) is a box structure formed by two symmetrically arranged long sides (101), two symmetrically arranged short sides (102), and a top surface (103). Crack-prevention holes (3) are provided at the four corners of the top plate (1), and a top plate clamping part (104) is fixedly connected to the top of the top plate (1). A top plate connecting hole (105) is provided on the long side (101). The rivet plate (2) is formed by two symmetrically arranged long sides (201), two symmetrically arranged short sides (202), and a top surface (203). 2) A box structure formed by the bottom surface (203) of the rivet plate, with anti-crack holes (3) at the four corners of the rivet plate (2); a rivet plate rivet hole (204) is provided at the geometric center of the bottom surface (203) of the rivet plate, and a rivet plate connecting hole (205) is provided on the long side surface (201) of the rivet plate; the rivet plate (2) is placed in the box space of the top plate (1), and the rivet plate (2) and the top plate (1) are connected by detachable fasteners that pass through the top plate connecting hole (105) and the rivet plate connecting hole (205); the upper component and the lower component are arranged in a mirror image relative to the bottom surface (203) of the rivet plate and are fixedly connected by a core-pulling rivet that passes through the rivet plate rivet hole (204).

2. The auxiliary device for testing and inspecting the tensile load of a pull-rivet according to claim 1, characterized in that: The resultant force generated by the detachable fastener in the vertical direction is perpendicular to the bottom surface (203) of the rivet plate and passes through the geometric center of the bottom surface (203) of the rivet plate.

3. The auxiliary device for testing and inspecting the tensile load of a blind rivet according to claim 1, characterized in that: The diameter of the crack-stopping hole (3) is twice the thickness of the plate.

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