High-strength expansion bolt

Abstract

The invention discloses a high-strength expansion bolt. The high-strength expansion bolt comprises a bolt body, a nut and an expansion sleeve, wherein the bolt body is provided with a frustum-shaped bolt head of which a bigger end is the tail end thereof; the outside diameter of the bigger end of the frustum-shaped bolt head is larger than the inside diameter of the expansion sleeve; a plurality of uniformly arranged longitudinal notches are formed at two ends of the expansion sleeve; a frustum-shaped lug boss which is sleeved on the bolt body is arranged between the nut and the expansion sleeve; a smaller end of the frustum-shaped lug boss is inserted into the expansion sleeve; and the outside diameter of the bigger end of the frustum-shaped lug boss is larger than the inside diameter of the expansion sleeve. The high-strength expansion bolt has the advantages of high strength, high pull bearing capability, simple manufacturing method, low cost and convenience for use.

Description

Technical field: [0001] The invention relates to the field of fasteners, in particular to a high-strength expansion bolt. Background technique: [0002] Existing expansion bolts include a bolt body and matching nuts and expansion sleeves. The bolt body has a large end with a frustum-shaped nail head at its end, and the expansion sleeve has an end near the frustum-shaped nail head. A plurality of longitudinal notches, in other words, one end of the expansion sleeve is divided into a plurality of expansion ribs, and the other end is still in a tubular shape. When in use, the nut is tightened, and the frustum-shaped nail head is pressed into the expansion sleeve from the small end to the large end, forcing its expansion rib to expand and deform in a conical shape. Such an expansion bolt only has an expansion force point at its end to support The expansion fastening effect is poor, and the bolt at the other end of the nut is prone to sideways. There are also two sets of expans...

AI Technical Summary

Problems solved by technology

When in use, the nut is tightened, and the frustum-shaped nail head is pressed into the expansion sleeve from the small end to the large end, forcing its expansion rib to expand and deform in a conical shape. Such an expansion bolt only has an expansion force point at its end to support The fastening effect of expansion is poor, and the bolt at the other end of the nut is prone to sideways deviation

There are also two sets of expansion tubes sequentially set up on a stud, so that there are two expansion points and the expansion point has a good effect of expansion and fastening. In this way, the overall length of the expansion bolt should be lengthened, and its requirements for the thickness of the object to be installed are also corresponding. Increased, so it is not suitable for use on thinner objects, and the cost is high

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