Round head square neck bolt

Abstract

The invention provides a round head square neck bolt. Turnover gaskets, a turnover matching body and sleeves, which are of special structures, are designed, the inclined planes of the sleeves are matched with the inclined planes of the gaskets, it is guaranteed that the turnover gaskets can be turned over correctly during work, and installation failures are avoided; the turnover gaskets and the turnover matching body are connected into a whole through protruding heads and grooves, the structure is compact, rapid and accurate single-side fixed connection of a fastener can be achieved through turnover movement of the multiple turnover gaskets, and the problem that bolt installation fails under certain special working conditions is solved; and the turnover gaskets are connected with the turnover matching body before installation, the installation process of the gaskets is omitted, after installation is completed, the inner end face of a round-head bolt head makes contact with the multipleturnover gaskets in a flat gasket shape at the same time, circumferential multi-point stress is achieved, stress is uniform, the mechanical property is good, and large bearing force can be borne.

Description

technical field [0001] The invention relates to the technical field of bolt structures, in particular to a round head square neck bolt. Background technique [0002] As a mechanical part, a bolt is a cylindrical threaded fastener with a nut. It is a type of fastener consisting of a head and a screw. It needs to be matched with a nut to fasten and connect two hole parts. Bolts are widely used in all walks of life, but the requirements for bolt strength in different industries, such as aerospace, oil exploration and other fields, have higher requirements for bolt strength, but the bolts currently on the market are difficult to fully meet the requirements of all walks of life Moreover, the way to manufacture high-strength bolts is generally turning forming, and the strength is often difficult to guarantee. Sometimes unsafe phenomena such as U-turns and rod fractures occur during use, which is very harmful to industrial production. [0003] When the round head square neck bolt...

AI Technical Summary

Problems solved by technology

[0004] This connection and fastening method is simple in structure, easy to operate, and good in load, but it is only suitable for open section members. When it is fixed, it is impossible to use this commonly used bolt and nut connection fastening method

For example: in the steel pipe structure and steel pipe concrete structure, at the joint of the beam column, because the steel pipe column is a closed section, it cannot be operated on both sides, and can only be connected and installed on one side, so this commonly used bolt and nut connection fastening method cannot be used For fast installation

At present, there is no corresponding unilateral bolt product in the domestic market, and the relevant patents that have been disclosed either weaken the bolt shank too much, or the bolt head has too few stress points; although similar products appear in foreign markets, such products It is difficult to apply a large pre-tension force to the bolts during the installation stage to form a friction-type bolted joint, and the comprehensive mechanical properties of the bearing are not ideal, which is greatly limited in the application of seismic design of building structures

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