Composite double-nut lock bolt

Abstract

The invention discloses a composite double-nut lock bolt. The composite double-nut lock bolt comprises an upper gasket, a lower gasket, an upper nut, a lower nut and a screw, and is characterized in that the screw comprises three integrally manufactured and formed parts, including an nut, an upper bolt rod and a lower bolt rod; the thread rotation direction of the upper bolt rod is exactly opposite to that of the lower bolt rod; the diameter of the upper bolt rod is a little larger than that of the lower bolt rod; the upper nut can be screwed on the thread of the upper bolt rod after directlypenetrating through the lower bolt rod; the lower nut is screwed on the thread of the lower bolt rod; the ratio of the upper and lower parts of the screw bolt rod follows the following principles: after the screw bolt rod is inserted into the upper gasket, an upper connecting part, a lower connecting part and the lower gasket in sequence, the upper nut is twisted, and at the moment the rearrest part of the tail of the upper nut is not screwed on the thread of the upper bolt rod but sleeves the thread of the lower bolt rod in a suspension manner; the lower nut is directly screwed on the upper nut; and finally a high-frequency cold welding machine is used for implementing spot welding at 1-2 positions so that the upper nut and the lower nut are connected as a whole.

Description

technical field [0001] The invention relates to the field of mechanical fasteners, in particular to a composite double-nut anti-loosening bolt. Background technique [0002] At present, due to the continuous vibration of the equipment, the bolt structure is likely to cause the fixed equipment to loosen, which in turn causes problems such as equipment failure and accidents. However, the diameter of the existing Tang’s anti-loosening bolts is variable cross-section and discontinuous, so the overall strength of the bolt is insufficient, easy to break and difficult to process; the existing anti-loosening bolts have complex structures, cumbersome, unreliable, many parts, and heavy weight , the cost is high, and there are various disadvantages and deficiencies that are not easy to produce in large quantities. [0003] There are four ways to prevent loosening of threaded fasteners commonly used in the market: [0004] The first is friction lock. This is the way Japan's Hadlock l...

AI Technical Summary

Problems solved by technology

But the forward and reverse bi-directional composite threads of the same diameter of the application are obviously not strong because the threads cross each other, the threads are discontinuous, so the practicability is poor

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