CN112576601A

CN112576601A - Round-head square-neck bolt

Info

Publication number: CN112576601A
Application number: CN201910932475.7A
Authority: CN
Inventors: 竺建波; 钱耀国; 沈健狄; 李文斌
Original assignee: Ningbo Jinding Fastening Piece Co ltd
Current assignee: Ningbo Jinding Fastening Piece Co ltd
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2021-03-30

Abstract

The invention provides a round-head square-neck bolt. The turnover gasket, the turnover matching body and the sleeve with special structures are designed, and the inclined surface of the sleeve is matched with the inclined surface of the gasket, so that the turnover gasket can be turned over correctly in work, and the mounting failure is avoided; the turnover type gasket and the turnover matching body are connected into a whole through the raised heads and the grooves, the structure is compact, the fastener can realize quick and accurate unilateral fixed connection through the turnover motion of the turnover type gaskets, and the problem of bolt installation failure under certain special working conditions is solved; the turnover type gasket is connected with the turnover matching body before installation, the installation process of the gasket is omitted, after installation is completed, the inner end face of the head of the round head bolt is simultaneously contacted with a plurality of turnover type gaskets in a flat cushion shape, and the turnover type gasket is stressed in multiple circumferential directions, is uniform in stress, good in mechanical property and capable of bearing large bearing capacity.

Description

Round-head square-neck bolt

Technical Field

The invention relates to the technical field of bolt structures, in particular to a round-head square-neck bolt.

Background

A cylindrical threaded fastener matched with a nut and used as a mechanical part is a fastener consisting of a head part and a screw rod, needs to be matched with the nut and is used for fastening and connecting two parts with through holes. The bolt is widely applied to various industries, but the requirement on the strength of the bolt in different industries, such as the fields of aerospace, petroleum exploration and the like, is higher, but the bolt in the current market hardly completely meets the requirement of various industries, and moreover, the mode of manufacturing the high-strength bolt is generally the turning molding, so that the strength is often difficult to ensure, unsafe phenomena such as turning around, rod part fracture and the like are generated in use sometimes, and the damage to industrial production is great.

Round head square neck bolt reduces the height on outstanding surface in the groove of square neck embedding by the connecting piece when using, then screws up the screw from the reverse side, and the connecting piece of this kind of structure has anti-skidding firm effect, also is difficult not hard up during vibrations, wide application in auto-parts field.

The connecting and fastening method has simple structure, convenient operation and good bearing capacity, but is only suitable for the open-section components, and the common bolt and nut connecting and fastening method cannot be used in some special occasions, such as connecting and fastening the closed-section components or the components which are inconvenient to operate on the other side. Such as: in steel pipe structures and steel pipe concrete structures, beam column connection nodes cannot be fastened and installed by the common bolt-nut connection fastening method because steel pipe columns are closed sections and cannot be operated on two sides and can only be connected and installed on one side. At present, no corresponding unilateral bolt product exists in the domestic market, and related published patents weaken too much bolt rods or reduce too few stress points of bolt heads; although similar products appear in foreign markets, the products are difficult to apply large pretension force to bolts in the installation stage so as to form a friction type bolt connecting joint, the comprehensive mechanical property of the load is not ideal, and the application of the product in building structure earthquake-resistant design is greatly limited.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the round-head square-neck bolt which is simple and reliable in installation process, convenient to disassemble, reusable, good in mechanical property and capable of bearing large bearing capacity.

In order to solve the technical problem, the invention is solved by the following technical scheme:

a round-head square-neck bolt comprises a bolt head with a hemispherical round head end, a screw rod arranged at one end of the bolt head and coaxial with the bolt head, and a turnover type gasket component, a sleeve and a gasket which are sequentially sleeved on the bolt head along the axial direction of the bolt head, wherein the turnover type gasket component comprises a turnover matching body and a plurality of turnover type gaskets which are uniformly distributed on the turnover matching body along the circumferential direction of the turnover matching body and are rotatably connected with the turnover matching body, the turnover type gaskets are matched with the sleeve, a tenon is arranged at the joint of the bolt head and the screw rod, a thin and short tooth body with uniform circumference is arranged on the outer circumferential surface of the column body part close to the lower part of the tenon, the thin and short tooth body protrudes out of the outer circumferential surface of the column body, the length direction of the thin and short tooth body is consistent with the axial direction of the screw rod, and, the bolt head, the square neck and the rod part of the screw rod are of an integrated structure formed by cold heading; and a dust cover is arranged between the screw rod and the bolt head, and the upper end and the lower end of the dust cover are respectively contracted on the screw rod and the bolt head through elastic spring coils.

In the round head square neck bolt, the section of the thin and short tooth body is a triangular sharp tooth, 18-26 thin and short tooth bodies are arranged on the outer circumferential surface of the column body of the fixing bolt, the height of the tooth body is not more than 0.5mm, and the angle between adjacent tooth surfaces of adjacent tooth bodies is selected to be 60-75 degrees.

Foretell button head square neck bolt, the head end of convertible gasket is equipped with the gasket inclined plane, and the tail end rotates with the upset cooperation body to be connected, telescopic tip is equipped with the sleeve inclined plane with gasket inclined plane looks adaptation.

Foretell button head square neck bolt, evenly set up a plurality ofly along circumference on the upset cooperation body and the gasket movable groove of convertible gasket looks adaptation, the tail end of convertible gasket is located the gasket movable groove.

According to the round-head square-neck bolt, the tail end of the turnover type gasket is provided with the gasket cambered surface matched with the gasket movable groove.

According to the round-head square-neck bolt, the two sides of the tail end of the turnover type gasket are respectively provided with the raised head, the movable groove of the gasket is internally provided with the groove matched with the raised head, and the raised head and the groove are in interference fit.

The round-head square-neck bolt is used for fixing the connecting piece, the connecting piece mounting hole is formed in the connecting piece, and the diameters of the bolt head and the overturning matching body are smaller than the inner diameter of the connecting piece mounting hole.

In the round head square neck bolt, the outer diameter of the sleeve is smaller than or equal to the inner diameter of the connecting piece mounting hole.

The screw rod is provided with a conical surface section which is located in the dust cover, one end of the conical surface section with a small diameter is in contact with the head of the bolt and is in arc transition arrangement, and the conical surface section is sleeved with the rubber retainer ring.

In the round-head square-neck bolt, the rod part of the screw rod is conical, the diameter of the large end of the conical section is larger than that of the top of the rod body, and the upper end of the dust cover tightly contacts with the conical surface of the rod body.

The round-head square-neck bolt is provided with the turnover type gasket, the turnover matching body and the sleeve which are of special structures, and the inclined surface of the sleeve is matched with the inclined surface of the gasket, so that the turnover type gasket can be turned over correctly in work, and the mounting failure is avoided; the turnover gasket and the turnover matching body are connected into a whole through the raised heads and the grooves, the structure is compact, the fastener can realize quick and accurate unilateral fixed connection through the turnover motion of a plurality of turnover gaskets, the problem of bolt installation failure under certain special working conditions is solved, the installation process is simple and reliable, the disassembly is convenient, the repeated use is realized, the mechanical property is good, and the large bearing capacity can be borne; the turnover type gasket is connected with the turnover matching body before installation, compared with the common gasket, the installation process of the common gasket is omitted, and after installation is finished, the inner end face of the round-head bolt head is simultaneously contacted with a plurality of turnover type gaskets in a flat cushion shape, so that the turnover type gasket is stressed in a circumferential direction at multiple points, is uniformly stressed, has good mechanical property and can bear large bearing capacity; the whole structure is simple and compact, the processing cost is low, the installation and the assembly are convenient, the gasket installation in advance is not needed, the auxiliary of an extra installation tool is not needed, the installation device is easy to use in the actual operation, and the installation efficiency can be greatly improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will discuss the drawings required to be used in the embodiments or the technical solutions in the prior art, it is obvious that the technical solutions described in the figures are only some embodiments of the present invention, and for those skilled in the art, other embodiments and drawings thereof can be obtained according to the embodiments shown in the drawings without creative efforts.

FIG. 1 is a schematic structural view of a round head square neck bolt of the present invention.

Detailed Description

The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments described herein without the need for inventive work, are within the scope of the present invention.

Referring to fig. 1, the invention provides a round-head square-neck bolt, which comprises a bolt head 3 with a hemispherical round head end, a screw 2 arranged at one end of the bolt head 3 and coaxial with the bolt head 3, and a turnover type gasket component, a sleeve and a gasket which are sequentially sleeved on the bolt head 3 along the axial direction of the bolt head 3, wherein the turnover type gasket component comprises a turnover matching body and a plurality of turnover type gaskets which are uniformly distributed on the turnover matching body along the circumferential direction of the turnover matching body and are rotationally connected with the turnover matching body, the turnover type gaskets are matched with the sleeve, a tenon 4 is arranged at the joint of the bolt head 3 and the screw 2, thin and short tooth bodies 5 which are uniformly distributed on the circumference of the cylinder part close to the lower part of the tenon 4 are arranged on the circumference of the cylinder part, the thin and short tooth bodies 5 protrude out of the outer circumference of the cylinder part, and the length direction of the, an inner screw hole is formed in the center of the other end of the bolt head 3, and the bolt head 3, the square neck 1 and the rod part of the screw rod 2 are of an integrated structure formed by cold heading; a dust cover 6 is arranged between the screw rod 2 and the bolt head 3, and the upper end and the lower end of the dust cover 6 are respectively contracted on the screw rod 2 and the bolt head 3 through elastic spring coils.

Further, in a preferred embodiment of the round head square neck bolt of the present invention, the screw rod 2 has a conical section located in the dust cover 6, the end with the smaller diameter of the conical section is in contact with the bolt head 3 and is arranged in an arc transition manner, and a rubber retaining ring is sleeved outside the conical section.

Further, in a preferred embodiment of the round head square neck bolt of the present invention, the rod part of the screw rod 2 is provided with a conical surface, the diameter of the end with the larger diameter of the conical surface section is larger than the diameter of the top of the rod body, and the upper end of the dust cover 6 tightly contacts with the conical surface of the rod body.

Further, in a preferred embodiment of the round head square neck bolt of the present invention, the section of the short and thin tooth body 5 is a triangular sharp tooth, 18-26 of the short and thin tooth bodies 5 are arranged on the outer circumferential surface of the cylindrical portion of the screw rod 2, the height of the tooth body is not more than 0.5mm, and the angle between adjacent tooth surfaces of adjacent tooth bodies is selected to be 60-75 degrees.

Further, in a preferred embodiment of the round head square neck bolt of the present invention, the head end of the turnover type washer is provided with a washer inclined surface, the tail end of the turnover type washer is rotatably connected with the turnover matching body, and the end of the sleeve is provided with a sleeve inclined surface adapted to the washer inclined surface.

Further, in a preferred embodiment of the round-head square-neck bolt of the invention, the turnover fitting body is uniformly provided with a plurality of gasket moving grooves matched with the turnover gasket along the circumferential direction, and the tail end of the turnover gasket is located in the gasket moving grooves.

Further, in a preferred embodiment of the round head square neck bolt of the present invention, the tail end of the turnover type washer is provided with a washer arc surface adapted to the washer moving groove.

Furthermore, in a preferred embodiment of the round-head square-neck bolt of the invention, protruding heads are arranged on two sides of the tail end of the turnover type gasket, grooves matched with the protruding heads are formed in the movable grooves of the gasket, and the protruding heads and the grooves are in interference fit.

Further, in a preferred embodiment of the round head square neck bolt of the present invention, the fastener is used for fixing a connecting member, a connecting member mounting hole is formed on the connecting member, and the diameters of the bolt head 3 and the overturning matching body are both smaller than the inner diameter of the connecting member mounting hole.

Further, in a preferred embodiment of the round head square neck bolt of the invention, the outer diameter of the sleeve is smaller than or equal to the inner diameter of the connecting piece mounting hole.

The bolt head 3 includes the button head bolt pole and sets up the button head bolt head in button head bolt pole one end, and the fitting surface between this button head bolt head and the upset cooperation body is the plane.

Before installation, the raised heads of all the turnover gaskets are placed in the grooves of the turnover matching bodies to form the turnover gasket assembly. The sleeve slopes can interact with the gasket slopes to guide each rollover gasket to rollover synchronously. Before installation, the turnover type gasket assembly and the sleeve are sleeved on a round-head bolt rod of the round-head bolt 2 and penetrate through one side of the connecting piece installation hole together with the round-head bolt head to the other side; then, the sleeve is abutted, the round-head bolt rod is pulled back, the inclined surface of the sleeve extrudes the inclined surface of the turnover type gasket to guide the turnover type gasket to be turned over integrally, and the outer diameter of the turnover type gasket assembly after turning over is larger than the aperture of the mounting hole of the connecting piece; and continuously pulling back the round-head bolt rod to enable each turnover type gasket to be tightly pressed between the turnover matching body and the inner wall of the connecting piece, and finally fastening the nut and the gasket to finish installation. The turnover type gasket can rotate on the turnover matching body through the matching between the raised head and the groove, and the cambered surface of the gasket can ensure that the turnover type gasket rotates smoothly without obstacles.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. The scope of the invention is indicated by the appended claims, rather than the foregoing description, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The round-head square-neck bolt comprises a bolt head (3) with a hemispherical round head end, and a screw (2) and a square-neck part (1) which are arranged at one end of the bolt head (3) and coaxial with the bolt head (3), and is characterized by further comprising a turnover type gasket component, a sleeve and a gasket which are sequentially sleeved on the bolt head (3) along the axial direction of the bolt head (3), wherein the turnover type gasket component comprises a turnover matching body and a plurality of turnover type gaskets which are uniformly distributed on the turnover matching body along the circumferential direction of the turnover matching body and are rotationally connected with the turnover matching body, the turnover type gaskets are matched with the sleeve, a tenon (4) is arranged at the joint of the bolt head (3) and the screw (2), a thin and short tooth body (5) with uniform distribution on the outer circumferential surface of a column body part below the tenon (4) is arranged, and the thin and short tooth body (5) protrudes out of the outer circumferential, the length direction of the thin and short tooth bodies is consistent with the axial direction of the screw rod (2), an inner screw hole is formed in the center of the other end of the bolt head (3), and the bolt head (3), the square neck (1) and the rod part of the screw rod (2) are of a cold heading integrated structure; a dust cover (6) is arranged between the screw rod (2) and the bolt head (3), and the upper end and the lower end of the dust cover (6) are respectively contracted on the screw rod (2) and the bolt head (3) through elastic spring coils.

2. The round nose square bolt according to claim 1, characterized in that the section of the thin and short tooth body (5) is a triangular sharp tooth, the thin and short tooth body (5) is provided with 18-26 teeth on the outer circumference of the cylinder part of the screw rod (2), the height of the tooth body is not more than 0.5mm, and the angle between the adjacent tooth surfaces of the adjacent tooth bodies is selected between 60-75 degrees.

3. The round head square neck bolt of claim 1, wherein the head end of the turnover washer is provided with a washer bevel, the tail end of the turnover washer is rotatably connected with the turnover fitting body, and the end of the sleeve is provided with a sleeve bevel matched with the washer bevel.

4. The round-head square-neck bolt according to claim 3, wherein a plurality of gasket moving grooves matched with the turnover type gasket are uniformly formed in the turnover matching body along the circumferential direction, and the tail end of the turnover type gasket is located in the gasket moving grooves.

5. The round head square neck bolt according to claim 4, wherein the tail end of the turnover type gasket is provided with a gasket arc surface matched with the gasket moving groove.

6. The round-head square-neck bolt according to claim 5, wherein raised heads are arranged on two sides of the tail end of the turnover type gasket, grooves matched with the raised heads are formed in the movable grooves of the turnover type gasket, and the raised heads and the grooves are in interference fit.

7. The round head square neck bolt according to claim 1, characterized in that the fastener is used for fixing a connecting piece, a connecting piece mounting hole is formed on the connecting piece, and the diameters of the bolt head (3) and the overturning matching body are smaller than the inner diameter of the connecting piece mounting hole.

8. The round nose lag bolt of claim 7, wherein the outer diameter of the sleeve is less than or equal to the inner diameter of the connector mounting hole.

9. The round head square neck bolt according to claim 1, characterized in that the screw (2) has a conical section in the dust cover (6), the end with the smaller diameter of the conical section contacts with the bolt head (3) and is in arc transition, and the conical section is sleeved with a rubber retaining ring.

10. The round head square neck bolt according to claim 9, characterized in that the shaft of the screw (2) is conical and the diameter of the conical section is larger than that of the top of the shaft, and the upper end of the dust cover (6) is tightly contacted with the conical surface of the shaft.