A jack-up pre-tightening system for locknuts

Abstract

The invention belongs to the technical field of pushing pre-tightening devices, and particularly relates to a locknut pushing pre-tightening system. The system comprises a fixed base; a main nut, a pushing sliding piece, an auxiliary nut, and a main bolt are included; the main bolt is arranged on a connected part, the main nut is provided with a first thread hole, a thread groove is formed in thebottom end of the main nut, a second thread hole is formed in the auxiliary nut, a mounting groove is formed in the upper end of the auxiliary nut, the main bolt is sleeved with the pushing sliding piece, a first outer thread and a second outer thread are arranged on the outer side of the pushing sliding piece, a pushing spring is arranged in the mounting groove, the top end of the pushing slidingpiece is in threaded connection with the thread groove through the first outer thread, the bottom end of the pushing sliding piece is in threaded connection with the mounting groove through the second outer thread, and the bottom end of the pushing sliding piece is in contact fit with the pushing spring. The phenomenon that when the connected part vibrates, the main bolt loosens can be avoided; and firm connection of the main bolt and the main nut can be improved, and loosening can be avoided.

Description

technical field [0001] The invention belongs to the technical field of jacking and pretensioning devices, in particular to a jacking and pretensioning system for lock nuts. Background technique [0002] It is one of the most common detachable connection methods. With the development of modern industry, bolt connection is still widely used in aerospace and chemical equipment for its advantages of easy disassembly, low manufacturing cost, and no damage to the connected parts. and other important areas, especially pressure equipment and power machinery. [0003] The existing connected parts are connected by bolts and nuts. It is difficult to pre-tighten the bolts and the pre-tightening force is difficult to control; if the working environment is very harsh, it may cause relative slippage of the nuts connected to the bolts, and the After slipping, the pre-tightening force will be lost and the friction force of the thread pair will decrease or even disappear, resulting in loosen...

AI Technical Summary

Problems solved by technology

[0004] In order to make up for the deficiencies in the prior art, the present invention proposes a lock nut jack-up pre-tightening system to solve the difficulty in pre-tightening the bolts in the prior art and the difficulty in controlling the pre-tightening force; if the working environment is very harsh, it may cause problems with The nuts connected by bolts slide relative to each other, and after multiple relative slides, the pre-tightening force is lost and the friction force of the thread pair decreases or even disappears, resulting in loosening and failure.

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