Expansion screw

Abstract

The invention discloses an expansion screw, which aims to provide an expansion screw that can effectively solve the problem of expansion tubes in the prior art due to gaps in the wall where the expansion screw is located without affecting the normal use of the expansion screw. It has risen to the maximum, and still cannot eliminate the gap in the wall where the expansion screw is located, resulting in the expansion screw is still in a loose state, unable to be fixed on the wall again, and the problem of failure of the expansion screw. It includes a screw rod, the tail of the screw rod is provided with a cone, and the screw rod is provided with a nut and a gasket; an expansion tube, the expansion tube is set on the screw rod; The screw hole runs through both ends of the screw rod, and the ejector rod and the inner screw hole are connected through threads. One end surface of the gasket is provided with an expansion tube compression sleeve, and the expansion tube compression sleeve is sleeved on the screw rod. The second nut of the nut The end face of one end is provided with a compression sleeve accommodation groove for accommodating the compression sleeve of the expansion tube.

Description

technical field [0001] The invention relates to a screw, in particular to an expansion screw. Background technique [0002] The expansion screw is composed of a screw rod and an expansion tube. The tail of the screw rod is conical, and the inner diameter of the cone is larger than the inner diameter of the expansion tube. When the nut is tightened, the screw moves outward, and the axial movement of the thread causes the cone to move, thereby forming a large positive pressure on the outer peripheral surface of the expansion tube, and the angle of the cone is small, so that the expansion tube expands. Thereby the expansion screws are fixed on the wall. [0003] During the long-term use of the current expansion screw, the expansion screw becomes loose due to vibration and other reasons. At this time, the nut needs to be tightened again to make the expansion tube continue to expand, and the expansion screw has been fixed on the wall again; but in the actual operation process ,...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an expansion screw, which can effectively solve the problem of the expansion screw in the prior art without affecting the normal use of the expansion screw. When the expansion reaches the maximum, the gap in the wall where the expansion screw is located still cannot be eliminated, resulting in the problem that the expansion screw is still in a loose state and cannot be fixed on the wall again, resulting in failure

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