Core-pulling rivet

Abstract

The utility model discloses a core-pulling rivet and relates to the technical field of mechanical connection.The core-pulling rivet comprises a rivet core and a rivet body, a conical spline is arranged at the position, close to the head, of the rivet core, a through hole with a step structure is formed in the rivet body, the rivet core is arranged in the through hole of the rivet body, and the step structure serves as a parting line. The diameter of the through hole close to one side of the rivet core head is larger than that of the through hole on the other side, the two through holes with different diameters form a step structure at the connected position, the conical spline is located in the through hole with the larger diameter before riveting, and the conical spline is embedded into the through hole with the smaller diameter under the action of pulling force after riveting. The hole walls are extruded and fixed together; according to the technical scheme, the contact area and the deformation degree of the rivet head and the rivet body are increased in the mode that the conical spline is matched with the through hole of the step structure, the contact friction force is improved, then the retention force of the rivet head in the rivet body is improved, and the problems that the rivet core is prone to loosening and falling off and abnormal sound is generated are solved on the premise that cost is not increased.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical connection, and more specifically, to a blind rivet with a core pulling function. Background Art

[0002] Stainless steel blind rivets with a core pulling function face challenges of salt spray corrosion in some application scenarios. To improve their salt spray resistance, in the existing manufacturing process, zinc-nickel plating treatment is carried out on the stainless steel surface. After the zinc-nickel plating treatment, the friction performance of the material surface changes, resulting in insufficient holding force of the nail head in the rivet body. For example, Figures 3 to 5 For ordinary blind rivets with a core pulling function, the nail head is prone to loosen in the rivet body and generate abnormal noises after riveting. In response to these problems, relevant improvements have been made in the existing technologies, such as Figures 6 to 7 For the existing double-drum blind rivets with a core pulling function, axial anti-slip teeth are provided on the nail rod, and the blind end of the rivet body is subjected to pipe shrinking and buckling. The rivet body and the nail core are clamped and matched. Even if the nail core is broken after riveting, the nail head and the rivet body can still be fixed together under the action of the axial anti-slip teeth, solving the loosening problem. However, in the manufacturing process of the nail core parts, a new axial anti-slip tooth forming process needs to be added. In addition, in the assembly process of the assembly, a new pipe shrinking and buckling process also needs to be added. Such an increase in processes will increase the costs of inspection and quality control. Due to the complexity of the processes, a higher scrap rate may occur, increasing the material waste and processing costs. Summary of the Utility Model

[0003] The purpose of the utility model is to increase the contact area between the nail head and the rivet body in the stainless steel blind rivet with a core pulling function, improve the contact deformation degree between the nail head and the rivet body during the riveting process, thereby increasing the contact friction force, and solving the problems of loosening of the nail head in the rivet body and generating abnormal noises, without increasing the manufacturing processes and costs.

[0004] The technical solution of the utility model is to provide a blind rivet with a core pulling function, which includes a nail core and a rivet body;

[0005] A tapered spline is provided at a position on the nail core close to the head. A through hole with a stepped structure is provided inside the rivet body. The nail core is arranged in the through hole of the rivet body. Taking the stepped structure as the dividing line, the diameter of the through hole on the side close to the head of the nail core is larger than the diameter of the through hole on the other side. Before riveting, the tapered spline is located in the through hole on the side close to the head of the nail core.

[0006] Further, the nail core includes a nail head and a nail rod, and the tapered spline is provided at a position on the nail rod close to the nail head.

[0007] Further, the width of the cross section of the tapered spline at one end close to the nail head is larger than the width of the cross section at the other end.

[0008] Further, a breaking notch is provided at a position on the nail rod close to the tapered spline, and the breaking notch is used to help the nail core break smoothly during the riveting process.

[0009] Further, protruding assembly ribs are provided on the outer wall of the nail rod, and the assembly ribs are tightly combined with the inner hole wall of the riveting body by an interference fit method.

[0010] Further, the through hole with a stepped structure includes a first-stage through hole and a second-stage through hole;

[0011] The first-stage through hole is provided at a position inside the riveting body close to the nail head, the diameter of the first-stage through hole is larger than the maximum width value of the tapered spline, the second-stage through hole is provided at the remaining position inside the riveting body, and the diameter of the second-stage through hole is smaller than the maximum width value of the tapered spline.

[0012] Further, the first-stage through hole is connected to the second-stage through hole, the diameter of the first-stage through hole is larger than that of the second-stage through hole, and the first-stage through hole and the second-stage through hole form a stepped structure at the connecting position.

[0013] Further, before riveting, the tapered spline is located in the first-stage through hole, and after riveting, the tapered spline is embedded into the hole wall of the second-stage through hole and is tightly combined with the second-stage through hole.

[0014] The beneficial effects of the present utility model are as follows:

[0015] In the technical solution of the present utility model, a tapered spline is designed on the nail core, and a through hole with a stepped structure is designed inside the riveting body. The diameter of the through hole on the side close to the head of the nail core is larger than that of the through hole on the other side, so that the tapered spline can be accommodated in the through hole with a larger diameter before riveting, and can enter the through hole with a smaller diameter after riveting, and is pressed and embedded with it and fixed together. In the technical solution of the present utility model, the fixing method of the tapered spline and the through hole with a stepped structure cooperating with each other can increase the contact deformation and contact area between the nail head and the riveting body, improve the contact friction force during riveting, and further improve the holding force of the nail head in the riveting body. After fixing, it is not easy to loosen, fall off or produce abnormal noises; the technical solution in the present utility model does not require additional processes during manufacturing or riveting, is simple to operate, has a low cost, and a high production yield of finished products. Description of the Drawings

[0016] The above and / or additional advantages of the present utility model will become obvious and easy to understand when combined with the description of the embodiments in the following drawings, where:

[0017] Figure 1 is a schematic structural diagram of the nail core in the blind rivet according to an embodiment of the present utility model;

[0018] Figure 2Schematic structural diagram of the riveting body in the core-pulling blind rivet according to an embodiment of the present utility model;

[0019] Figure 3 Schematic diagram of the component composition of a common core-pulling blind rivet;

[0020] Figure 4 Schematic structural diagram of the nail core in a common core-pulling blind rivet;

[0021] Figure 5 Schematic cross-sectional view of a common core-pulling blind rivet;

[0022] Figure 6 Schematic diagram of the component composition of an existing double-drum core-pulling blind rivet;

[0023] Figure 7 Schematic structural diagram of the nail core in an existing double-drum core-pulling blind rivet;

[0024] Among them, 1 - nail core, 11 - nail head, 12 - nail rod, 121 - breaking notch, 122 - assembly rib, 13 - tapered spline, 2 - riveting body, 21 - first-stage through hole, 22 - second-stage through hole. Detailed implementation manners

[0025] In order to more clearly understand the above-mentioned objects, features and advantages of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present utility model and the features in the embodiments can be combined with each other.

[0026] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present utility model is not limited by the specific embodiments disclosed below.

[0027] As Figures 1 to 2 shown, this embodiment provides a core-pulling blind rivet, and the device includes a nail core 1 and a riveting body 2. A through hole with a stepped structure is arranged inside the riveting body 2. Taking the stepped structure as the dividing line, the diameter of the through hole closer to the nail head 11 is larger than that of the other side through hole, and the nail core 1 is arranged in the through hole of the riveting body 2.

[0028] The nail core 1 includes a nail head 11, a nail rod 12 and a tapered spline 13. Among them, the tapered spline 13 is arranged on the nail rod 12 at a position close to the nail head 11, that is, at a position close to the head of the nail core 1. The width of the cross-section of the tapered spline 13 at one end close to the nail head 11 is larger than that of the other end cross-section.

[0029] As Figure 1As shown, the tapered spline 13 on the nail core 1 is a strip tooth structure protruding outward. The strip tooth structure is longitudinally and evenly arranged on the nail rod 12 near the nail head 11. The width of the tapered spline 13 on one side of the nail head 11 is greater than that on the other side, which facilitates the smooth entry of the tapered spline 13 into the interior of the riveting body 2 during the riveting process and enables it to be squeezed and combined with the inner hole wall. In this embodiment, the tapered spline 13 can be manufactured by cold heading process to ensure good contact effect during the riveting process.

[0030] A breaking notch 121 is provided at the position on the nail rod 12 near the tapered spline 13. The breaking notch 121 is used to help the nail core 1 break smoothly. During the riveting process, the nail core 1 will break at the breaking notch 121 after reaching the predetermined tensile force, preventing damage to the workpiece itself caused by excessive stretching.

[0031] Protruding assembly ribs 122 are provided on the outer wall of the nail rod 12. The assembly ribs 122 can be tightly combined with the inner hole wall of the riveting body 2 by interference fit, so that the nail core 1 and the riveting body 2 are assembled together (assembly refers to the assembly of the nail core 1 and the riveting body 2 before riveting), which can keep the nail rod 12 in a relatively fixed state within the riveting body 2 and avoid loosening or rotation during transportation or assembly, thus ensuring the smooth progress of subsequent riveting operations.

[0032] A through hole with a stepped structure is provided inside the riveting body 2. The through hole with a stepped structure includes a first-stage through hole 21 and a second-stage through hole 22. The first-stage through hole 21 is provided inside the riveting body 2 near the nail head 11, and its length matches that of the tapered spline 13, and its diameter is larger than the width value of the widest side of the tapered spline 13. Among them, the width value of the widest side of the tapered spline 13 is the maximum width value. The second-stage through hole 22 is provided at the remaining position inside the riveting body 2, and its diameter is smaller than the maximum width value of the tapered spline 13. The first-stage through hole 21 is connected to the second-stage through hole 22, and the diameter of the first-stage through hole 21 is larger than that of the second-stage through hole 22, and they form a stepped structure at the connection position due to different diameters.

[0033] In this embodiment, the first-stage through hole 21 serves as a countersunk hole. Since its diameter is large, it can accommodate the tapered spline 13 before riveting without causing deformation of the riveting body 2, and it can wrap the sunk nail head 11 after riveting; the second-stage through hole 22 is used to accommodate the nail rod 12 before riveting.

[0034] A flange structure is provided at the lower end of the riveting body 2. The flange structure is used to cooperate with the nail head 11 to fasten the target object to be fixed.

[0035] Before the blind rivet is riveted, the rivet core 1 is installed in the through hole inside the rivet body 2. Among them, the rivet head 11 is located outside the rivet body 2, the tapered spline 13 is located in the first through hole 21, and the rivet rod 12 is located in the second through hole 22. Among them, the assembly rib 122 and the hole wall of the second through hole 22 are assembled together by interference fit, so that the rivet core 1 remains relatively fixed inside the rivet body 2; after the blind rivet is riveted, the rivet head 11 sinks into the first through hole 21 under the action of an external tensile force, and the tapered spline 13 sinks into the second through hole 22 under the action of the external tensile force. The outwardly protruding strip tooth structure thereof is embedded into the hole wall of the second through hole 22, and the hole wall of the second through hole 22 deforms, so that the tapered spline 13 is tightly combined with the second through hole 22, and the friction force between the two increases and it is not easy to fall off. The rivet rod 12 breaks at the break notch 121 under the action of the external tensile force and is drawn out from the second through hole 22 inside the rivet body 2. Except for the drawn part, the rest of the blind rivet forms a firm whole.

[0036] In this embodiment, the working principle of the blind rivet is as follows:

[0037] Prepare the target object to be fixed, drill a hole at a predetermined position on the target object, assemble the rivet core 1 in the through hole inside the rivet body 2. As a standard part as a whole, insert the blind rivet into the drilled hole, apply a tensile force at one end of the rivet rod 12 away from the rivet head 11, so that the tapered spline 13 is embedded into the second through hole 22, and the two are mutually extruded and fastened, so that the rivet head 11 is embedded into the first through hole 21. When the tensile force reaches a certain magnitude, the rivet rod 12 breaks at the break notch 121, and the broken part is drawn out from the second through hole 22, and the remaining part of the rivet core 1 remains inside the rivet body 2 and is combined with the rivet body 2 as a whole. This whole clamps the target object through the rivet head 11 and the flange structure at the lower end of the rivet body 2.

[0038] In the present utility model, terms such as "installation", "connection", "connection", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] The shapes of the various components in the drawings are all schematic, and it is not excluded that there are certain differences from their actual shapes. The drawings are only used to illustrate the principle of the present utility model and are not intended to limit the present utility model.

[0040] Although the present utility model is disclosed in detail with reference to the accompanying drawings, it should be understood that these descriptions are merely exemplary and are not intended to limit the application of the present utility model. The protection scope of the present utility model is defined by the appended claims and may include various variations, modifications, and equivalent solutions made to the utility model without departing from the protection scope and spirit of the present utility model.

Claims

1. A blind rivet, characterized in that: The blind rivet comprises: a rivet core (1) and a rivet body (2); A conical spline (13) is arranged on the nail core (1) near the head, a through hole with a step structure is arranged inside the rivet body (2), the nail core (1) is arranged in the through hole of the rivet body (2), and the diameter of the through hole on one side near the head of the nail core (1) is larger than the diameter of the through hole on the other side, with the step structure as a dividing line. Before riveting, the conical spline (13) is located in the through hole on one side near the head of the nail core (1).

2. The blind rivet according to claim 1, characterized in that: The nail core (1) comprises a nail head (11) and a nail rod (12), and the conical spline (13) is arranged on the nail rod (12) at a position close to the nail head (11).

3. The blind rivet according to claim 2, characterized in that: The width of the cross section of the tapered spline (13) at one end close to the nail head (11) is greater than the width of the cross section at the other end.

4. The blind rivet according to claim 2, characterized in that: A breaking notch (121) is provided on the nail rod (12) at a position close to the conical spline (13), and the breaking notch (121) is used to help the nail core (1) to break smoothly during the riveting process.

5. The blind rivet according to claim 2, characterized in that: A protruding assembly rib (122) is provided on the outer wall of the nail rod (12), and the assembly rib (122) is tightly combined with the inner hole wall of the rivet body (2) by means of interference fit.

6. The blind rivet according to claim 3, characterized in that: The through hole with a step structure comprises a first section through hole (21) and a second section through hole (22); The first section through hole (21) is arranged at a position inside the rivet body (2) close to the nail head (11), and the diameter of the first section through hole (21) is greater than the maximum width value of the tapered spline (13). The second section through hole (22) is arranged at the remaining position inside the rivet body (2), and the diameter of the second section through hole (22) is less than the maximum width value of the tapered spline (13).

7. The blind rivet according to claim 6, characterized in that: The first section through hole (21) is connected to the second section through hole (22); the diameter of the first section through hole (21) is larger than the diameter of the second section through hole (22); and the first section through hole (21) and the second section through hole (22) form a step structure at the connecting position.

8. The blind rivet according to claim 7, characterized in that: Before riveting, the tapered spline (13) is located in the first section through hole (21), and after riveting, the tapered spline (13) is embedded in the hole wall of the second section through hole (22) and is tightly combined with the second section through hole (22).

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