Shaft shoulder bolt of anti-loosening structure

Abstract

A shaft shoulder bolt of an anti-loose structure comprises a first screw rod and a second screw rod which are coaxially arranged and a shaft shoulder arranged between the first screw rod and the second screw rod, the shaft shoulder comprises an anti-loose flange part and a polygonal driving part, and a plurality of radial anti-skid friction protrusions are arranged on the end face of the side, facing the first screw rod, of the anti-loose flange part in an equally-divided mode around the axis. The anti-skid friction protrusions are arranged to be a plurality of through grooves penetrating through the anti-loose flange part in the axial direction, a threaded shaft part is arranged between the anti-loose flange part and the polygonal driving part, and the diameter of the threaded shaft part is larger than the radial size of the polygonal driving part. By means of the improvement, the problem that the anti-skid friction protrusions are abraded and fail after being used for a long time is solved, the shaft shoulder bolt does not need to be disassembled and replaced, the pressing nut does not need to be further screwed during maintenance, the anti-loose rubber body can be driven to further move, gaps caused by abrasion are filled, and the friction coefficient between the anti-loose rubber body and the surface of a fixed object is recovered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fastener, in particular to a shaft shoulder bolt with anti-loose structure. BACKGROUND

[0002] The shaft shoulder bolt is also called double head bolt or double head stud, which is used for connecting and fixing link function of machinery. The double head bolt has threads on both ends. In use, one end is screwed into the main body, and the other end is provided with a nut after the accessory is installed. In actual work, the external load has vibration, change, material high temperature creep, etc. which can cause the friction force to decrease. The normal pressure in the threaded pair disappears in a moment, and the friction force is zero, so that the threaded connection is loose and fails. Therefore, the double head bolt must be prevented from loosening, otherwise it will affect the normal work and cause accidents. At present, the anti-loose structure of some double head bolts is relatively simple, the overall anti-loose ability is poor, and a gasket needs to be used during installation. The gasket used in the existing double head bolt is designed in a metal ring shape. Since the gasket will be worn during repeated installation, the gasket needs to be replaced. When the staff replaces the gasket, the nut needs to be unscrewed from the bolt to remove the gasket, which greatly prolongs the replacement time when the staff replaces the gasket in large quantities.

[0003] Therefore, it is necessary to improve the existing double head bolt structure, enhance the anti-loose effect, and simplify the maintenance work of the bolt. SUMMARY

[0004] The present application provides a shaft shoulder bolt with anti-loose structure to solve the above technical problems.

[0005] The technical scheme of the present application is as follows: a shaft shoulder bolt with anti-loose structure, comprising coaxially arranged first screw rod, second screw rod, and shaft shoulder arranged between the first screw rod and the second screw rod. The shaft shoulder comprises an anti-loose flange part and a polygonal driving part. A plurality of radial anti-skid friction protrusions are arranged on the end face of the anti-loose flange part towards the first screw rod and are equally divided around the shaft center.

[0006] The plurality of anti-skid friction protrusions are arranged as a plurality of through grooves penetrating the anti-loose flange part in the axial direction. A threaded shaft part is arranged between the anti-loose flange part and the polygonal driving part, and the diameter of the threaded shaft part is greater than the radial dimension of the polygonal driving part. The bolt further comprises a plurality of anti-loose rubber bodies and a pressing nut. The profile of the anti-loose rubber body is matched with the profile of the through groove, and the thickness of the anti-loose rubber body is greater than that of the anti-loose flange part. The pressing nut is threadedly connected with the threaded shaft part and drives the plurality of anti-loose rubber bodies to move towards the first screw rod.

[0007] The further setting of the utility model discloses: the end face of the pressure nut towards the second screw rod one side is provided with '' C '' type slot, the anti-loose rubber washer profile is adapted and is clamped in the slot, and the anti-loose rubber washer thickness is greater than the slot, and extends towards the second screw rod one side along the axial direction.

[0008] The further setting of the utility model discloses: the end face of the pressure nut towards the second screw rod one side is provided with '' C '' type slot, the anti-loose rubber washer profile is adapted and is clamped in the slot, and the anti-loose rubber washer thickness is greater than the slot, and extends towards the second screw rod one side along the axial direction.

[0009] The further setting of the utility model discloses: the outer circumferential surface of the first screw rod is provided with the permeation groove along the axial direction, one end of the permeation groove is communicated with the through slot on the end face of the anti-loose flange part towards the first screw rod one side, and the other end passes through each screw thread on the first screw rod.

[0010] The further setting of the utility model discloses: the first screw rod, second screw rod surface is provided with physical glue or chemical glue.

[0011] The utility model discloses the beneficial effect: in the use process of double-end shaft shoulder bolt, first through the operation polygon drive part (perforation setting is octagonal, cooperation market commonly used wrench) make the first screw rod spin into the fixed material's screw hole and tighten, and the anti-skid friction protrusion of anti-loose flange part towards the first screw rod one side, always spin close, and the surface of fixed material is attached, and the friction coefficient of anti-loose flange part is enhanced, so as to reach the purpose of anti-skid.

[0012] And in further design, the through slot is set at the anti-skid friction protrusion, then the anti-loose rubber body is placed into the through slot, because its thickness is greater than the through slot, and the threaded shaft part and the thread cooperation of pressure nut are further designed, the anti-loose rubber body is moved towards the first screw rod by the tightening of pressure nut, so that the surface of fixed material is always contacted, and the friction coefficient is enhanced.

[0013] This improvement avoids the problem that the anti-skid friction protrusion is worn out for a long time, and the shaft shoulder bolt does not have to be disassembled and replaced, and the anti-loose rubber body can be further moved by further tightening the pressure nut during maintenance, so as to fill the gap caused by wear and restore the friction coefficient of the anti-loose rubber body and the surface of the fixed material.

[0014] Meanwhile, the anti-loose rubber washer is arranged on the side of the pressure nut towards the second screw rod, and the anti-loose rubber washer is pressed by the tightening of the connecting member and the second screw bolt to prevent the pressure nut from loosening. The anti-loose rubber washer and the slot are arranged in the shape of "C", and the unnecessary rotation of the anti-loose rubber washer is prevented by embedding.

[0015] The further design of the utility model discloses, still designs the permeation groove of first screw outer surface axial arrangement, and the other end each screw tooth is communicated with the through groove communication, makes the first screw use chemical glue or physical glue and strengthens the anti-loose effect, and after long -term use, can supplement chemical glue or material glue through the through groove when maintaining, or other fastener usual gluing, such as leakproof, anticorrosion and the like function gluing. The design of the permeation groove cooperation through groove, detachable anti-loose rubber body can only detach the connecting object when maintaining, and need not to dismantle the whole bolt, injects the glue liquid in the through groove, and the glue liquid seeps into each screw tooth along the permeation groove, thereby, the maintenance process is simple and convenient, and the whole bolt dismantling, reinstallation causes the deviation influence is avoided.

[0016] Physical glue: the main component of physical glue is PA (polyamide), by spraying PA powder on the screw heated to high temperature, using the elastic deformation characteristics of special engineering plastics, in the screw locking process, engineering plastics are extruded to produce strong frictional torque and reaction force, increase the friction between the screw thread, provide absolute resistance to vibration, thereby realizing anti-loose. The chemical glue used in fastener, screw is usually called fastening glue or anaerobic sealant. This glue is mainly used to ensure that the screw does not fall off in operation. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 For the structure of the embodiment of the application Figure One ;

[0018] Figure 2 For the structure of the embodiment of the application Figure Two ;

[0019] Figure 3 For the structure of the embodiment of the application Figure Three ;

[0020] Figure 4 For the structure of the embodiment of the application Figure Four ;

[0021] Among them, 1-first screw, 11-permeation groove, 2-second screw, 3-anti-loose flange part, 31-through groove, 4-polygon drive part, 5-anti-slip friction protrusion, 6-thread shaft part, 7-anti-loose rubber body, 8-pressing nut, 81-embedded groove, 9-anti-loose rubber ring. DETAILED DESCRIPTION

[0022] In order to better illustrate the embodiment, some components of the drawing will be omitted, enlarged or reduced, and the size of the actual product is not represented, and in addition, the drawing is only used for example, and cannot be understood as the limitation of the patent.

[0023] Particular Embodiment Anti-looseningIn order to make the technical solutions of the present application and the advantages thereof clearer, the technical solutions of the present application will be further described in detail below with reference to the drawings. It should be understood that the specific embodiments described herein are only part of the embodiments of the present application, and are only used to explain the present application, but not to limit the present application. It should be noted that, for the purpose of description, only parts related to the present application are shown in the drawings, and other related parts can be referred to the general design. In the case of no conflict, the embodiments in the present application and the technical features in the embodiments can be combined to obtain new embodiments.

[0024] The present application will be described in detail below with reference to the drawings, as shown in a shaft shoulder bolt of a loosening prevention structure, comprising coaxially arranged first screw rod 1, second screw rod 2, and shaft shoulder arranged between the first screw rod 1 and the second screw rod 2, the shaft shoulder comprising loosening prevention flange part 3, polygonal driving part 4, the loosening prevention flange part 3 is provided with several radial anti-skid friction protrusions 5 on the end face of the side of the first screw rod 1. Figures 1-4

[0025] The several anti-skid friction protrusions 5 are provided as several through grooves 31 penetrating the loosening prevention flange part 3 in the axial direction, the thread shaft part 6 is arranged between the loosening prevention flange part 3 and the polygonal driving part 4, the diameter of the thread shaft part 6 is greater than the radial dimension of the polygonal driving part 4;

[0026] The bolt further comprises several loosening prevention rubber bodies 7 and pressure nut 8, the profile of the loosening prevention rubber body 7 is matched with the profile of the through groove 31, and the thickness of the loosening prevention rubber body 7 is greater than that of the loosening prevention flange part 3, the pressure nut 8 is threadedly connected with the thread shaft part 6, and drives the several loosening prevention rubber bodies 7 to move towards the side of the first screw rod 1.

[0027] The end face of the side of the pressure nut 8 towards the second screw rod 2 is coaxially provided with loosening prevention rubber gasket 9, the loosening prevention rubber gasket 9 is axially extruded by the connection on the second screw rod 2, and abuts against the pressure nut 8.

[0028] The end face of the side of the pressure nut 8 towards the second screw rod 2 is provided with "C" type embedding groove 81, the profile of the loosening prevention rubber gasket 9 is matched with the embedding groove 81 and is clamped in the embedding groove 81, the thickness of the loosening prevention rubber gasket 9 is greater than that of the embedding groove 81, and extends towards the side of the second screw rod 2 in the axial direction.

[0029] The outer circumferential surface of the first screw rod 1 is provided with permeation groove 11 in the axial direction, one end of the permeation groove 11 is communicated with the through groove 31 on the end face of the side of the loosening prevention flange part 3 towards the first screw rod 1, and the other end passes through each thread on the first screw rod 1.

[0030] The surface of the first screw rod 1 and the second screw rod 2 is provided with physical glue or chemical glue.

[0031] ​In the use of the double-end shoulder bolt, first, the polygonal driving part 4 (through the eight-shaped setting, matched with the commonly used wrench in the market) is operated to rotate the first screw rod 1 into the threaded hole of the fixed object, the anti-slip friction protrusion 5 provided on the side of the first screw rod 1 of the anti-loosening flange part 3 is close to and in contact with the surface of the fixed object at any time, the friction coefficient of the anti-loosening flange part 3 is enhanced, and thus the anti-slip purpose is achieved.

[0032] In further design, the through groove 31 is provided at the anti-slip friction protrusion, then the anti-loosening rubber body 7 is arranged in the through groove 31, the thickness of the anti-loosening rubber body 7 is greater than that of the through groove 31, the threaded shaft part 6 and the pressing nut 8 are designed to be threadedly matched, the anti-loosening rubber body 7 is moved to the side of the first screw rod 1 by the tightening of the pressing nut 8, and thus the surface of the fixed object is always contacted, and the friction coefficient is enhanced.

[0033] The improvement avoids the problem that the anti-slip friction protrusion 5 is worn out after long-time use, and the shoulder bolt does not need to be disassembled and replaced, the anti-loosening rubber body 7 is further moved by further tightening of the pressing nut 8 during maintenance, the gap caused by wear is filled, and the friction coefficient of the anti-loosening rubber body 7 and the surface of the fixed object is restored.

[0034] Meanwhile, the anti-loosening rubber gasket 9 is arranged on the side of the pressing nut 8 facing the second screw rod 2, the anti-loosening rubber gasket 9 is pressed by the tightening of the connecting object and the second screw rod, and the pressing nut 8 is prevented from loosening. The anti-loosening rubber gasket 9 and the embedding groove 81 are arranged in the "C" shape, and the unnecessary rotation of the anti-loosening rubber gasket 9 is prevented by embedding.

[0035] In further design of the utility model, the permeation groove 11 is arranged on the outer surface of the first screw rod 1 in the axial direction, one end of the permeation groove 11 is communicated with the through groove 31, and the other end is communicated with each thread, so that when the chemical glue or physical glue is used to enhance the anti-loosening effect of the first screw rod 1, the chemical glue or physical glue or other commonly used glue for fasteners, such as leak-proof glue and corrosion-proof glue, can be supplemented through the through groove 31 during maintenance after long-time use. The design of the permeation groove 11 matched with the through groove 31 and the detachable anti-loosening rubber body 7 can only disassemble the connecting object during maintenance, and the whole bolt does not need to be disassembled, the glue solution is injected into the through groove 31, and the glue solution is permeated into each thread through the permeation groove 11, so that the maintenance process is simplified, and the deviation caused by disassembly and reinstallation of the whole bolt is avoided.

[0036] Physical glue: the main component of physical glue is PA (polyamide), by spraying PA powder on the screw heated to high temperature, using the elastic deformation characteristics of special engineering plastics, in the process of screw locking, engineering plastics are squeezed to generate strong friction torque and reaction force, increase the friction between the screw thread, provide absolute resistance to vibration, so as to realize anti-loose. The chemical glue used in fasteners and screws is usually called fastening glue or anaerobic sealant. This glue is mainly used to ensure that the screw does not fall off during operation.

[0037] So far, the technical solution of the present application has been described in combination with the preferred embodiments shown in the drawings. It should be understood by those skilled in the art that the protection scope of the present application is obviously not limited to these specific embodiments. Without deviating from the principles of the present application, those skilled in the art can make equivalent changes or replacements to the related technical features. The technical solutions after these changes or replacements will fall within the protection scope of the present application.

Claims

1. A lock washer shoulder bolt characterized by: The bolt comprises a first screw rod, a second screw rod and a shoulder arranged between the first screw rod and the second screw rod, the shoulder comprising an anti-loosening flange part and a polygonal driving part, the anti-loosening flange part being provided with a plurality of radial anti-skid friction protrusions on an end face thereof towards the first screw rod.

2. The lock washer shoulder bolt of claim 1, wherein: The plurality of radial anti-skid friction protrusions are arranged as a plurality of through grooves penetrating the anti-loosening flange part in the axial direction, and a threaded shaft part is arranged between the anti-loosening flange part and the polygonal driving part, the threaded shaft part having a diameter greater than the radial dimension of the polygonal driving part. The bolt further comprises a plurality of anti-loosening rubber bodies and a pressing nut, the anti-loosening rubber bodies having a profile matched with that of the through grooves and a thickness greater than that of the anti-loosening flange part, and the pressing nut is threadedly connected with the threaded shaft part and drives the plurality of anti-loosening rubber bodies to move towards the first screw rod.

3. The lock washer shoulder bolt of claim 2, wherein: An anti-loosening rubber gasket is coaxially arranged on an end face of the pressing nut towards the second screw rod, the anti-loosening rubber gasket being axially pressed by a connector on the second screw rod and abutting against the pressing nut.

4. The lock washer shoulder bolt of claim 3, wherein: A "C"-shaped embedding groove is arranged on the end face of the pressing nut towards the second screw rod, the anti-loosening rubber gasket having a profile matched with that of the embedding groove and being clamped in the embedding groove, the anti-loosening rubber gasket having a thickness greater than that of the embedding groove and extending towards the second screw rod in the axial direction.

5. The shoulder bolt of any one of claims 2-4, wherein: A permeation groove is arranged on an outer circumferential surface of the first screw rod in the axial direction, the permeation groove being in communication with the through groove on the end face of the anti-loosening flange part towards the first screw rod at one end and passing through each thread on the first screw rod at the other end.

6. The lock washer shoulder bolt of claim 5, wherein: The first screw rod and the second screw rod are provided with physical glue or chemical glue on surfaces thereof.

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