Two-stage reinforcing expansion bolt

Abstract

The invention discloses a two-stage reinforcing expansion bolt which comprises a bolt main body, an expansion casing and a screw nut, wherein the expansion casing is arranged on the bolt main body ina sleeving manner; the screw nut is used for screwing the expansion casing; a plain washer and a spring washer for releasing the screw nut are arranged between the expansion casing and the screw nut;a conical platform is arranged at one end of the bolt main body; the expansion casing comprises an expansion section and a fixing section. The two-stage reinforcing expansion bolt is characterized inthat an annular sleeve is arranged at one end of which the diameter is relatively large, of the conical platform; openings are formed in the annular sleeve; a triangular prism is arranged in positionscorresponding to the openings in the annular sleeve on the conical platform. The two-stage reinforcing expansion bolt has the advantages that due to adoption of the annular sleeve and the triangularprism on the conical platform, the triangular prism protrudes outwards in the mounting process, then the solidness and the stability of the expansion bolt can be improved, the expansion bolt is not easily dissociated from a mounting hole when being vibrated, the sharp part of the triangular prism is fed into the mounting hole, the stability of the expansion bolt is improved, and due to addition ofthe triangular prism, the two-stage reinforcing function is achieved, and the security coefficient is improved.

Description

technical field [0001] The invention belongs to the technical field of construction industry, and in particular relates to a secondary reinforcement expansion bolt. Background technique [0002] Expansion bolt is a special threaded connection used to fix pipeline brackets, hangers, brackets or equipment on walls, floors and columns. It is mainly composed of bolts, expansion tubes, flat washers, spring washers and hexagonal nuts. , when in use, you must first drill holes of corresponding size on the fixed body with an impact electric drill, then put the bolts and expansion tubes into the holes, and tighten the nuts to make the bolts, expansion tubes, mounting parts and the fixed body expand. Tightly become one. There is a big head at the end of the bolt, and a round pipe slightly larger than the diameter of the bolt is placed on the outside of the bolt. There are several openings in the tail part. When the bolt is tightened, the tail of the big head is brought into the open ...

AI Technical Summary

Problems solved by technology

[0003] The expansion bolts currently used in the market still have certain defects. They may loosen when external conditions change, such as rainy days or when the load has a large vibration, and there are certain safety hazards.

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