Anti-rust fastener for expansion bolt

Abstract

The invention discloses an antirust fastener for expansion bolts, which comprises a self-tapping screw, a self-tapping nut is installed on the outer surface of the self-tapping screw close to the left end, and a ring is formed on the front end surface of the self-tapping nut close to the middle position. Curved surface groove, the front end surface of the self-tapping nut is provided with a flat ring platform groove near the middle position of the curved surface groove, the inner middle position of the self-tapping nut is provided with a screw rail hole, and the inner wall of the self-tapping nut is provided with spiral rail. The anti-rust fastener can realize the sealing of the interface of the annular surface groove, which can effectively avoid the accumulation of water vapor at the interface, prevent local corrosion, avoid the support rail in the process of rotating the self-tapping nut, and prevent water vapor from entering the inside of the casing body , realize the internal rust prevention of the fastener, ensure that the interior is in a dry state, realize the local anti-corrosion function, provide a buffer for the extrusion force between the bolt head and the casing body, and facilitate the disassembly of the fastener by the staff to offer comfort.

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...

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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 interface. It is prone to local water vapor accumulation and local corrosion. When the self-tapping nut is rotated, the spring washer is prone to support rails, and the inside of the casing body is easy to collect water vapor. The extrusion force between the pipe bodies is buffered, which brings inconvenience to the staff when disassembling

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