Anti-rust fastener for expansion bolt

Abstract

The invention discloses an anti-rust fastener for an expansion bolt. The anti-rust fastener for the expansion bolt comprises a self-tapping nut, an annular curved surface groove is formed in the position where the front end surface of the self-tapping nut is closed to a middle position, a flat ring platform groove is formed in the position where the front end surface of the self-tapping nut is closed to the middle position of the curved surface groove, a screw rail hole is formed in the middle position of the self-tapping nut, and a spiral rail is formed in the inner side wall of the self-tapping nut. The anti-rust fastener can realize sealing an interface of the annular curved surface groove, the accumulation of water vapor at the interface can be effectively avoided, local corrosion phenomenon is prevented, the water vapor is prevented from entering into a sleeve pipe main body, the internal anti-rust of the fastener is realized, the interior of the fastener is ensured to be dry, thelocal anti-corrosion function is realized, buffering is provided for the squeezing force between a bolt bar head and a sleeve pipe main body, and convenience is provided to workers to disassemble thefastener.

Description

technical field [0001] The invention relates to the field of expansion bolts, in particular to an antirust fastener for expansion bolts. Background technique [0002] Expansion bolts use the inclination of the shape to promote the expansion to generate friction and grip force to achieve the fixing effect. One end of the screw is threaded, the other end has a cone, and the outside is covered with a steel sheet. There are several cuts in the half of the iron cylinder. Put them together into the hole made on the wall, and then lock the nut. The nut pulls the screw outward to adjust the cone. Pull in the steel skin cylinder, the steel skin cylinder is expanded, and then it is tightly fixed on the wall; it is generally used for fastening fences, awnings, air conditioners, etc. on cement, bricks and other materials; [0003] Most of the fasteners on the market cannot seal the interface of the annular surface groove, and it is impossible to avoid the accumulation of water vapor at...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an anti-rust fastener for expansion bolts, to solve the problem that most of the fasteners on the market proposed in the above background technology cannot seal the interface of the annular surface groove, and it is impossible to avoid the accumulation of water vapor at the in...

Images