Double-drum type self-plugging rivet

Abstract

The double-drum type self-plugging rivet comprises a rivet core and a rivet body arranged on the rivet core in a sleeving mode and is characterized in that a limiting block is fixed to the end, close to the rivet body, of the rivet core, the rivet body comprises a rod body and a cap body integrally formed at one end of the rod body, and the cap body is located at the end, away from the limiting block, of the rod body; a first annular groove is formed in the outer side wall of the rod body, a second annular groove is formed in the outer side wall of the rod body, the first annular groove and the second annular groove are arranged at intervals in the axis direction of the rod body, a first deformation area is formed between the first annular groove and the limiting block, and a second deformation area is formed between the first annular groove and the second annular groove. By the adoption of the scheme, when the self-plugging rivet is used, the rivet core is pulled, the first deformation area and the second deformation area are deformed into double bumps, meanwhile, a workpiece is extruded and fixed, and therefore the problem that an existing self-plugging rivet is unstable in connection after being used for a long time is solved.

Description

Technical Field

[0001] The present application relates to the technical field of blind rivets, and in particular to a double-drum blind rivet. Background Art

[0002] Blind rivets are a type of rivet used for single-sided riveting. When used, they need to be used with a special tool, a rivet gun. During riveting, the rivet core is pulled by the special rivet gun, causing the rivet body to expand, thereby achieving a riveting effect.

[0003] When a conventional rivet is used, the rivet body will produce a deformation to form a single bulge, thereby fixing the workpiece by squeezing the bulge. However, the fixing force and resistance strength generated by this single bulge deformation are limited, and long-term use can easily cause the workpiece to fall off. Summary of the invention

[0004] In order to solve the problem that conventional rivets are prone to causing workpieces to fall off after long-term use, the present application provides a double-drum blind rivet.

[0005] The present application provides a double-drum blind rivet, which adopts the following technical solution:

[0006] A double-drum type blind rivet comprises a nail core and a rivet body sleeved on the nail core, wherein a limiting block is fixed to one end of the nail core close to the rivet body, and the rivet body comprises a rod body and a cap body integrally formed at one end of the rod body, and the cap body is located at the end of the rod body away from the limiting block, and a first annular groove is provided on the outer wall of the rod body to facilitate the formation of a first bulge, and a second annular groove is provided on the outer wall of the rod body to facilitate the formation of a second bulge, and the first annular groove and the second annular groove are arranged at intervals along the axis direction of the rod body, a first deformation zone is formed between the first annular groove and the limiting block, and a second deformation zone is formed between the first annular groove and the second annular groove.

[0007] By adopting the above technical solution, when in use, the nail core is pulled by the rivet gun, and the second deformation zone of the rod body is deformed first under the guidance of the first annular groove and the second annular groove to form a first bulge, and the nail core is continuously pulled to deform the first deformation zone to form a second bulge. The workpiece is fixed by mutually squeezing the first bulge, the second bulge and the cap body, thereby improving the fixing force and resistance strength generated by the deformation of the rivet, increasing the service life, that is, enhancing the installation stability of the workpiece when the rivet is used for a long time.

[0008] Preferably, guide grooves are provided on the outer side walls of the first annular groove, the second annular groove and the first deformation zone, the guide grooves are provided along the axis direction of the rod body, and a plurality of guide grooves are provided at even intervals along the circumference of the rod body.

[0009] By adopting the above technical solution, the guide groove is provided to guide the deformation of the rod body during use, so that the rod body is more easily deformed into a double bulge shape.

[0010] Preferably, a side of the cap body facing away from the limiting block is formed with an inclined surface, and the thickness of the cap body gradually decreases from the center to the periphery.

[0011] By adopting the above technical solution, when the rivet gun is used and the nail core is pulled, the cap body is squeezed. By forming a slope on one side of the cap body, the squeezing force is concentrated in the central area of ​​the cap body, so that the deformation force of the cap body is also concentrated in the central area. On the one hand, it is conducive to the formation of a bulge on the rod body, and on the other hand, it avoids the upward bending and deformation of the peripheral side of the cap body.

[0012] Preferably, a rubber pad is fixedly provided on a side of the cap body facing the limiting block.

[0013] By adopting the above technical solution, the contact friction between the cap body and the workpiece is increased through the rubber pad during use, thereby increasing the stability of the workpiece installation.

[0014] Preferably, the outer side wall of the second deformation zone is formed with anti-slip grooves.

[0015] By adopting the above technical solution, the anti-slip grooves are provided during use, so that when the outer wall of the second deformation zone is deformed into a bulge, the friction force with the contact surface of the workpiece is increased, thereby ensuring the stability of the installation and fixation of the workpiece.

[0016] Preferably, a guide slope is formed at the connecting edge of the rod body and the cap body.

[0017] By adopting the above technical solution and setting the guide bevel, on the one hand, when installing the rod body, the rod body and the installation hole opened on the workpiece are more compatible. On the other hand, when the rod body is deformed, the guide bevel will also deform accordingly, thereby making the contact between the workpiece and the cap body more stable.

[0018] Preferably, a side of the limiting block facing the cap body is provided with an embedding groove, and an end of the rod body away from the cap body is embedded in the embedding groove.

[0019] By adopting the above technical solution, the inner wall of the groove abuts against the end of the rod body during use, thereby preventing the limit block from being embedded in the cap body under the action of strong extrusion force when pulling the nail core, thereby cracking the cap body and reducing the structural strength of the cap body.

[0020] Preferably, the side wall of the nail core is provided with serrations.

[0021] By adopting the above technical solution, the friction between the rivet gun and the rivet core is increased by the serrations during use, thereby facilitating the pulling of the rivet core.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. When in use, the rivet core is pulled by the rivet gun, and under the action of the first annular groove, the second annular groove and the guide groove, the first deformation zone and the second deformation zone are guided to deform into a bulge shape, so that the rivet body forms a double-drum shape, thereby increasing the overall fixing force and resistance strength of the rivet, thereby increasing the stability of the workpiece fixation;

[0024] 2. When in use, a rubber pad is arranged on the cap body, and an anti-slip pattern is formed on the outer wall of the second deformation zone, thereby increasing the friction between the cap body and the workpiece, and between the workpiece and the side wall of the second deformation zone, thereby making the installation of the workpiece more stable;

[0025] 3. During use, a guide bevel is formed at the connecting edge of the rod body and the cap body to increase the abutment stability of the rod body with the workpiece when it is inserted into the workpiece. By providing an embedding groove on the limit block, the end of the rod body is embedded in the embedding groove. When the nail core is pulled, the side wall of the limit block abuts against the rod body, avoiding the limit block in the prior art from being embedded in the rod body and cracking the rod body, thereby increasing the structural strength of the rivet body after deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an axonometric diagram mainly showing the overall structure in the embodiment of the present application;

[0027] Figure 2 It is an exploded view mainly showing the overall structure in the embodiment of the present application;

[0028] Figure 3 It is an axonometric diagram mainly showing the rivet body structure in the embodiment of the present application;

[0029] Figure 4 It is an axonometric schematic diagram mainly showing the structure of the rivet body after riveting in the embodiment of the present application.

[0030] Figure numerals: 1, nail core; 2, rivet body; 21, rod body; 22, cap body; 23, first annular groove; 24, second annular groove; 25, first deformation zone; 26, second deformation zone; 27, through hole; 3, limit block; 31, embedding groove; 4, guide groove; 5, inclined surface; 6, rubber pad; 7, anti-slip pattern; 8, guide inclined surface; 9, serrated pattern; 10, first bulge; 20, second bulge. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1 -Attached Figure 4 This application is described in further detail.

[0032] The embodiment of the present application discloses a double-drum type blind rivet.

[0033] Reference Figure 1 and Figure 2 A double-drum blind rivet comprises a nail core 1 and a rivet body 2. The rivet body 2 is sleeved on the nail core 1. A limiting block 3 is integrally formed on the top of the nail core 1. The bottom surface of the limiting block 3 abuts against the top surface of the rivet body 2. A serration pattern 9 is formed on the side wall of the nail core 1. The serration pattern 9 is provided in a plurality of groups, and the plurality of groups of serration patterns 9 are evenly distributed along the axial measurement of the nail core 1. When in use, the area where the serration pattern 9 is provided on the nail core 1 is clamped by a rivet gun, which increases the friction between the rivet gun and the side wall of the nail core 1, which is conducive to the rivet gun to rivet the rivet.

[0034] Reference Figure 2 and Figure 3 The rivet body 2 includes a rod body 21 and a cap body 22. The rod body 21 is provided with a through hole 27 for the nail core 1 to be inserted. The cap body 22 is coaxially fixed to the bottom end of the rod body 21, and the top end of the rod body 21 abuts against the bottom surface of the limit block 3. In order to increase the abutment stability of the limit block 3 and the top end of the rod body 21 during riveting, an embedding groove 31 is provided on the bottom surface of the limit block 3. The bottom surface of the embedding groove 31 is inclined upward from the outer edge to the center direction, and the shape of the top end of the rod body 21 is consistent with the shape inside the embedding groove 31. During use, when the nail core 1 is pulled, the top end of the rod body 21 is abutted and limited by the inner side wall of the embedding groove 31, thereby avoiding the situation where the limit block 3 is embedded in the through hole 27 when the conventional rivet is riveted, thereby increasing the stability of the rivet connection.

[0035] Reference Figure 3 A first annular groove 23 and a second annular groove 24 are formed on the outer side wall of the rod body 21. The first annular groove 23 and the second annular groove 24 are arranged at intervals along the axial direction of the rod body 21. A first deformation zone 25 is formed between the top of the rod body 21 and the first annular groove 23, and a second deformation zone 26 is formed between the first annular groove 23 and the second annular groove 24. When in use, the deformation direction of the first deformation zone 25 is guided by the first annular groove 23, and the deformation direction of the second deformation zone 26 is guided by the second annular groove 24, thereby ensuring that the first deformation zone 25 and the second deformation zone 26 can bulge outward to form a bulge.

[0036] Reference Figure 2 and Figure 3 The first annular groove 23, the second annular groove 24 and the outer side wall of the first deformation zone 25 are all formed with guide grooves 4, the guide grooves 4 are opened along the axial direction of the rod body 21, and the guide grooves 4 are connected with the through hole 27, and multiple groups of guide grooves 4 are opened, and the multiple groups of guide grooves 4 are evenly opened along the circumference of the rod body 21. At the same time, in order to increase the contact stability between the bulge formed after the second deformation zone 26 is deformed and the workpiece, an anti-slip pattern 7 is also integrally formed on the outer side wall of the second deformation zone 26; when in use, the first annular groove 23 and the second annular groove 24 are guided by the guide grooves 4, so that the deformation bulge of the first deformation zone 25 and the second deformation zone 26 is easier. At the same time, the guide grooves 4 are not opened on the second deformation zone 26 to avoid affecting the structural strength of the second deformation zone 26, thereby increasing the resistance strength of the rivet body 2.

[0037] Reference Figure 1 and Figure 4 When riveting, the second deformation zone 26 is first deformed to produce the first bulge 10 through the extrusion of the limit block 3 and the cap body 22, and the nail core 1 is continuously pulled to deform the first deformation zone 25 to produce the second bulge 20. At this time, the workpiece can be fixed by clamping the first bulge 10 and the cap body 22, and the fixing force and resistance strength of the rivet body 2 after deformation are increased by the second bulge 20, thereby improving the stability of the workpiece fixation.

[0038] Reference Figure 1 and Figure 3 A guide slope 8 is formed at the edge where the top surface of the cap body 22 and the rod body 21 are connected. A layer of rubber pad 6 is also fixedly connected to the cap body 22. In this embodiment, the rubber pad 6 is preferably set to be an elastic rubber material. The bottom surface of the cap body 22 is formed with a slope 5, so that the cap body 22 is conical as a whole, and the conical surface faces the bottom end of the nail core 1; when using a rivet gun to rivet, the rivet gun will squeeze the bottom surface of the cap body 22. Under the action of the conical surface of the cap body 22, the abutment force of the rivet gun and the cap body 22 is located in the central area of ​​the cap body 22, thereby avoiding deformation and upward bending of the peripheral side of the cap body 22, thereby increasing the stability of the abutment between the cap body 22 and the workpiece.

[0039] The implementation principle of the embodiment of the present application is as follows: when in use, the rivet body 2 is inserted into the workpiece, the area on the nail core 1 with the serrations 9 is clamped by a rivet gun, and then the nail core 1 is pulled, and the top of the rod body 21 is squeezed by the limit block 3. Under the guidance of the first annular groove 23, the second annular groove 24 and the guide groove 4, the second deformation zone 26 is deformed first to produce the first bulge 10. At this time, the nail core 1 is continued to be pulled, and the first deformation zone 25 is deformed to produce the second bulge 20. Then, the workpiece is fixed under the mutual extrusion of the first bulge 10 and the cap body 22, and the friction between the cap body 22 and the workpiece is increased by the rubber pad 6 on the cap body 22. The friction between the first bulge 10 and the workpiece is increased by the anti-slip pattern 7 formed on the outer wall of the first bulge 10, so that the workpiece is fixed more stably, and then the nail core 1 can be clamped off by the rivet gun to complete the core pulling, thereby completing the riveting of the double-drum type core-pulling rivet.

[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A double-drum blind rivet, comprising a mandrel (1) and a rivet body (2) sleeved on the mandrel (1), characterized in that: A limiting block (3) is fixed to one end of the nail core (1) close to the rivet body (2); the rivet body (2) comprises a rod body (21) and a cap body (22) integrally formed at one end of the rod body (21); the cap body (22) is located at the end of the rod body (21) away from the limiting block (3); the outer wall of the rod body (21) is provided with a first annular groove (23) for facilitating the formation of a first bulge (10); the outer wall of the rod body (21) is provided with a second annular groove (24) for facilitating the formation of a second bulge (20); the first annular groove (23) and the second annular groove (24) are arranged at intervals along the axial direction of the rod body (21); a first deformation zone (25) is formed between the first annular groove (23) and the limiting block (3); and a second deformation zone (26) is formed between the first annular groove (23) and the second annular groove (24).

2. A double-drum blind rivet according to claim 1, characterized in that: The first annular groove (23), the second annular groove (24) and the outer side walls of the first deformation zone (25) are all provided with guide grooves (4), the guide grooves (4) are provided along the axis direction of the rod body (21), and a plurality of the guide grooves (4) are evenly spaced along the circumference of the rod body (21).

3. A double-drum blind rivet according to claim 1, characterized in that: A slope (5) is formed on a side of the cap body (22) facing away from the limiting block (3), and the thickness of the cap body (22) gradually decreases from the center to the periphery.

4. A double-drum blind rivet according to claim 1, characterized in that: A rubber pad (6) is fixedly provided on one side of the cap body (22) facing the limiting block (3).

5. The double-drum blind rivet according to claim 1, characterized in that: The outer side wall of the second deformation zone (26) is formed with anti-slip grooves (7).

6. A double-drum blind rivet according to claim 1, characterized in that: A guide slope (8) is formed at the connecting edge of the rod body (21) and the cap body (22).

7. The double-drum blind rivet according to claim 1, characterized in that: A embedding groove (31) is provided on a side of the limit block (3) facing the cap body (22), and an end of the rod body (21) away from the cap body (22) is embedded in the embedding groove (31).

8. The double-drum blind rivet according to claim 1, characterized in that: The side wall of the nail core (1) is provided with sawtooth patterns (9).

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