Shape memory alloy nut anti-loose sleeve

Abstract

The invention discloses a shape memory alloy nut anti-loose sleeve and belongs to mechanical parts. The shape memory alloy nut anti-loose sleeve is made of single-travel shape memory alloy and comprises a sleeve body and two elongate pins integrally arranged with the sleeve body. An inner hole of the sleeve body is a hexagonal hole corresponding to the shape structure of a nut, and the pins are symmetrically arranged on two sides of the sleeve body. The shape memory alloy nut anti-loose sleeve can be assembled on a nut at the high temperature and cooled to deform, the sleeve body is fixedly sleeved with the nut, the pins are fastened on a fastening part, and looseness of the nut can be effectively prevented. During demounting or adjusting, a heater can be used to heat the sleeve to saltus temperature, so that size and shape of the sleeve can be restored at the high temperature, the sleeve can be easily detached and operation is simple. Besides, the shape memory alloy nut anti-loose sleeve can keep its original performance after long-term repeated use.

Description

technical field [0001] The invention relates to a mechanical component, in particular to a nut lock sleeve made of shape memory alloy material. Background technique [0002] Nuts have been widely used in the fastening of dynamic and static devices. They are more flexible and convenient to use. However, in the case of vibration of the fastened parts, the nuts tend to loosen, which constitutes a safety hazard, especially in some large-scale operation machinery. In fact, when the machine is running, it will generate strong vibrations, which will be transmitted to the fastened parts to cause displacement and deformation, resulting in loosening of the positioning nuts. Strong vibration is generated, which is transmitted to the track and sleepers in turn, causing slight displacement and deformation of the track or sleepers, resulting in the loosening of the positioning nut, so it needs to be tightened and adjusted frequently. [0003] The current anti-loosening measures are to ad...

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Problems solved by technology

[0003] The current anti-loosening measures are to add wire thread sleeves, cotter pins or spring pads. The main problem is that the disassembly and assembly of wire thread sleeves is cumbersome and the operation is slightly difficult; the disassembly and assembly of cotter pins is also cumbersome and easy to break. Repeated use will cause waste of materials; the anti-loosening effect of spring pads is slightly poor, and effective anti-loosening cannot be guaranteed under strong vibrations, and cannot be reused, resulting in waste of materials

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