Connecting pair

Abstract

The utility model relates to a connecting pair which comprises a bolt and a nut, the bolt is composed of a screw rod and a bolt head, the bolt head is tightly attached to the surface of a locked object, and the screw rod is arranged at the center of the bottom face of the bolt head, is vertically downward and is provided with threads. A blind hole is formed in the screw rod, and an expansion assembly is arranged in the screw rod. In the embodiment, the expansion assembly is arranged in the bolt to expand or contract to tighten and loosen the bolt, the bolt is simple in structure and convenient to use, and the stability of the bolt is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bolts, in particular to a connection pair. Background Art

[0002] Joints are a common mechanical connection method in various industries and daily life. However, traditional bolt and nut joints are prone to loosening in a vibration environment, which has prompted the development of a new type of joint with anti-vibration function.

[0003] The invention with publication number CN117267240A discloses a bolt with a connecting pair fastening structure. The structure mainly relies on the cooperation of a connecting block, a connecting hole, a transmission rod, a transmission block, a movable rod, a fixed block, an extrusion plate, a rubber strip and a limiting mechanism. The rubber strip can squeeze and fix the inner wall of the threaded hole, thereby making the bolt more stable when installed in the threaded hole and preventing the bolt from loosening.

[0004] However, in the above structure, the extrusion method requires pressing the push block above to make the fastening mechanism expand horizontally, thereby forcing the extrusion plate to extend outward and complete the fastening. The whole operation process is relatively cumbersome, and its structure is complex and difficult to process. It is also very easy to cause the fastening structure to recover due to vibration or external impact, and the stability is poor. Utility Model Content

[0005] Based on the above description, the utility model provides a connection pair to solve the shortcomings of the existing connection pair, such as complex structure, difficult processing, cumbersome operation, easy recovery due to vibration or external impact, and poor stability.

[0006] The utility model is realized by the following technical solutions:

[0007] A connection pair, comprising a bolt, a nut and a tightening assembly:

[0008] It is characterized in that

[0009] The bolt consists of a screw rod and a bolt head;

[0010] A blind hole is provided at the center of the upper end surface of the bolt head, and the blind hole extends downward into the screw rod. A plurality of openings are provided on the side of the threaded section of the screw rod, and the openings are connected to the blind hole.

[0011] The expansion assembly includes a central shaft and an expansion block. The central shaft is arranged in a blind hole. The expansion block is arranged at an opening and can extend into the blind hole. The side extending into the blind hole has an inclined surface. The lower part of the central shaft is provided with a conical surface that can fit with the inclined surface of the expansion block. The central shaft can push the expansion block to translate radially along the screw through axial movement.

[0012] On the basis of the above technical solution, the present invention can also be improved as follows.

[0013] Furthermore, the contact surface between the bolt head and the nut is provided with an annular groove, a gasket is arranged on the groove, and the bottom surface of the gasket protrudes to form a corrugated protrusion.

[0014] Furthermore, an adaptive thread structure is provided between the inner wall of the blind hole and the outer wall of the central axis.

[0015] Furthermore, the upper and lower edges of the opening are respectively provided with step surfaces, and an elastic connector is provided on the step surface, and the other end of the elastic connector is fixedly connected to the flange end surfaces at both ends of the expansion block.

[0016] Furthermore, the main body of the expansion block is a trapezoidal metal block, the outward side of the expansion block is a horizontal plane and an elastic pad is provided on the surface.

[0017] Furthermore, a limiting groove is provided on the top surface of the bolt head, an adjusting cap is provided on the top of the central axis, the adjusting cap is screwed into the limiting groove, and a hexagonal hole is provided at the center of the top surface of the adjusting cap.

[0018] Furthermore, the surfaces of the bolts and nuts are both provided with a zinc-nickel diffusion layer.

[0019] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0020] The present application is improved based on the existing connection substructure. Although it also adopts the extrusion and expansion method, the structure of the present application is simpler and can be directly assembled and installed on the bolt surface. In this structure, the adjustment cap on the top is also embedded in the bolt cap, so it can effectively avoid accidental touch and cause the bolt to loosen. The structure is simple and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of the bolt and nut in this embodiment;

[0022] Figure 2 This is a schematic diagram of the structure of the expansion assembly in this embodiment;

[0023] Among them: 1. bolt; 11. bolt head; 12. screw; 13. limit groove; 14. opening; 15. gasket; 2. nut; 3. expansion assembly; 31. adjustment cap; 32. center shaft; 33. expansion block; 34. elastic connector. DETAILED DESCRIPTION

[0024] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0026] Combination Figure 1-2 As shown, a connection pair includes:

[0027] The bolt 1 is composed of a screw rod 12 and a bolt head 11 connected together. The screw rod 12 is located at the center of the bottom surface of the bolt head 11 and is arranged downward, and has threads on the surface;

[0028] The nut 2 has a threaded hole at the center and is locked to the bottom end of the screw 12;

[0029] The expansion assembly 3 is arranged inside the screw rod 12 and is used to strengthen the connection stability between the bolt 1 and the hole of the bolt 1.

[0030] Specifically; in the above structure, the contact surface of the bolt head 11 and the nut 2 is provided with an annular groove, and a gasket 15 is arranged on the groove. The bottom surface of the gasket 15 protrudes to form a corrugated protrusion. Therefore, when the bolt 1 is fastened and installed with the nut 2, the gasket 15 on the bolt head 11 and the nut 2 should fit tightly with the surface of the locked object. The gasket 15 should be made of rubber or nylon. Therefore, under a strong extrusion pressure, the corrugated protrusion will fit with the surface of the object to form multiple sealed spaces, thereby effectively isolating the external air from contact with the inside, especially in an environment with high humidity, it can effectively prevent rust at the connection of the bolt 1 and greatly improve its service life.

[0031] The expansion assembly 3 consists of three parts: an adjusting cap 31, a center shaft 32 and a expansion block 33, wherein a limiting groove 13 is provided on the top surface of the bolt head 11, the adjusting cap 31 is embedded in the limiting groove 13 and can rotate freely, the center of the limiting groove 13 extends downward to form a long blind hole, and the center shaft 32 is vertically arranged inside the blind hole, and its top end is fixedly connected to the center of the bottom surface of the adjusting cap 31, and an adaptive threaded structure is also provided between the inner wall of the blind hole and the outer wall of the center shaft 32, so the center shaft 32 can be driven to rotate downward by twisting the adjusting cap 31.

[0032] In addition, a protruding portion in the shape of an inverted cone is integrally provided on the side wall of the central shaft 32. An opening 14 is also provided on the outer side wall of the screw rod 12. The opening 14 is located in the middle area of ​​the threaded section, and the protruding portion of the central shaft 32 is located exactly at the position of the opening 14.

[0033] The expansion block 33 is a trapezoidal metal block, and its outward side is a horizontal plane and is provided with an elastic pad. The elastic pad can be made of flexible materials such as rubber pads or silicone pads, which are used to fit against the inner wall of the threaded hole, while the inward side is set as an inclined surface, which is exactly adapted to the inclined surface of the protruding part of the central axis 32, and the two fit each other.

[0034] In summary, when the adjusting cap 31 rotates forward, the central shaft 32 rotates downward through the threaded structure, and the protruding portion is pressed downward synchronously, and the expansion block 33 with the inclined surface is forced to be pressed to the outside of the screw rod 12, thereby completing the expansion with the elastic pad on its surface, thereby enhancing the tightening effect of the bolt 2.

[0035] At the same time, considering that when the entire connection pair is dismantled in the above process, the expansion block 33 needs to be completely retracted into the screw 12, so step surfaces should be provided at the upper and lower ends of the opening 14, and an elastic connector 34 should be provided on the step surface. The elastic connector 34 can be made of a small spring or an elastic material such as a rubber block, so that when the central shaft 32 rotates in the opposite direction, the expansion block 33 is automatically retracted into the clamping block 14, thereby facilitating subsequent disassembly.

[0036] In the above structure, the processing process only requires opening a blind hole on the bolt and an opening on the surface, and other parts can be assembled after the external processing is completed. The structure is simple and the space occupied inside is small, which can not only improve the stability of the bolt 1, but also avoid affecting the strength of the bolt 1 body. When the expansion assembly 3 is unfolded, its adjustment cap is completely screwed into the limit groove 31 so that it is flush with the top surface of the bolt head 11. At the same time, with the threaded structure between the center axis 3 and the blind hole, there is no need to worry about the loosening of the expansion assembly 3 caused by accidental touch or impact, vibration and other factors of external objects, making the structure more stable.

[0037] Furthermore, a hexagonal hole is provided at the center of the top surface of the adjustment cap 31 to prevent angle slippage, so as to cooperate with the above-mentioned built-in structure to prevent accidental touch.

[0038] Moreover, the inner and outer side walls of the entire bolt 1 and the nut 2 should be provided with a zinc-nickel diffusion layer to improve corrosion resistance and wear resistance, thereby further improving the service life of the connection pair.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solution recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solution from the technical solution of the embodiments of the utility model.

Claims

1. A connection pair, comprising a bolt (1), a nut (2) and a tightening assembly (3): It is characterized in that The bolt (1) is composed of a screw rod (12) and a bolt head (11); A blind hole is provided at the center of the upper end surface of the bolt head (11), the blind hole extends downward into the screw rod, a plurality of openings (14) are provided on the side of the threaded section of the screw rod, and the openings (14) are communicated with the blind hole; The expansion assembly (3) comprises a central shaft (32) and an expansion block (33); the central shaft (32) is arranged in a blind hole; the expansion block (33) is arranged at an opening and can extend into the blind hole; and a side extending into the blind hole has an inclined surface; a conical surface capable of fitting with the inclined surface of the expansion block (33) is provided at the lower part of the central shaft (32); and the central shaft (32) can push the expansion block (33) to translate radially along the screw rod through axial movement.

2. A connection pair according to claim 1, characterized in that: The contact surfaces of the bolt head (11) and the nut (2) are provided with an annular groove, a gasket (15) is arranged on the groove, and the bottom surface of the gasket (15) is convex to form a corrugated protrusion.

3. A connection pair according to claim 1, characterized in that: An adaptable thread structure is also provided between the inner wall of the blind hole and the outer wall of the central axis (32).

4. A connection pair according to claim 1, characterized in that: The upper and lower edges of the opening (14) are respectively provided with step surfaces, and an elastic connecting piece (34) is provided on the step surface, and the other end of the elastic connecting piece is fixedly connected to the flange end surfaces at both ends of the expansion block (33).

5. A connection pair according to claim 1, characterized in that: The main body of the expansion block (33) is a trapezoidal metal block. The outward side of the expansion block (33) is a horizontal surface and an elastic pad is provided on the surface.

6. A connection pair according to claim 1, characterized in that: The top surface of the bolt head (11) is provided with a limiting groove (13), the top of the central shaft (32) is provided with an adjusting cap (31), the adjusting cap (31) is screwed into the limiting groove (13), and a hexagonal hole is provided at the center of the top surface of the adjusting cap (31).

7. A connection pair according to claim 1, characterized in that: The surfaces of the bolt (1) and the nut (2) are both provided with a zinc-nickel diffusion layer.

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