A kind of anti-loosening rapid expansion bolt

Abstract

An anti-loosening rapid expansion bolt, comprising: a bolt inner core, a nut, a wave washer, a tapered collar, a bolt outer ring and an eccentric wheel mechanism, and the eccentric wheel mechanism is composed of a rectangular notch, a U-shaped slot, and an eccentric wheel ; By pulling the inner core of the bolt, the inner core moves outwards, so that the eccentric wheel expands outward under the action of the U-shaped slot on the upper part of the inner core. The more the inner core moves downward, the greater the outward expansion of the eccentric wheel. Just when the expansion is close to the wall, continue to rotate the nut slightly and continue to lock it to complete the expansion installation of the bolt. There are two paddles in the middle of the outer ring of the bolt, and the direction is outward. When the inner core of the bolt moves outward, single The paddle fluctuates to achieve the effect that the inner core can only go out but not in, ensuring the one-way stability of the expansion of the eccentric wheel. In the dynamic expansion of the eccentric wheel of the new expansion bolt, the friction force is a dynamic value, and the more you pull it, the tighter it is. There will be no detachment and other functions due to the aging of the wall surface.

Description

technical field [0001] The invention relates to the technical field of expansion bolts and fasteners, in particular to an anti-loosening rapid expansion bolt. Background technique [0002] The expansion bolt is a commonly used installation part in engineering. After the expansion bolt is driven into the hole on the ground or wall, the workpiece to be fixed is set on the screw, and then the nut is screwed onto the screw, and the expansion bolt is tightened with a wrench. Nuts and bolts go out, but the outer metal sleeve does not move, so the big head under the bolt expands the metal sleeve to make it fill the entire hole. At this time, the expansion bolt cannot be pulled out, and the workpiece is also fixed. In the expansion bolt; [0003] For example, the Chinese invention patent No. 2017107316649 discloses an expansion bolt, which includes a screw rod, a circular expansion tube, a flat washer, a spring washer and a nut. The front part of the screw rod has external threads ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is very obvious. When the outer ring expands, it needs a very large nut rotation pulling force, which is inconvenient when working at heights. This is very time-consuming and laborious. Moreover, the expanded diameter of the outer ring remains rigid after plastic deformation. When the wall surface ages, the wall drilling becomes larger, and the expansion bolts will loosen and fall off.

Aging air conditioners fall from the outer walls of high-rise buildings, which is very dangerous

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