Torque force-fixing device used for pneumatic wrench in electricity industry

Abstract

The invention relates to a torsion setting device for an impact wrench, which can change the tightening torsion according to requirements. The torsion setting device comprises a columnar cylinder body of which one end is sealed and one end is open, a central shaft, a supporting body mounted at the open end of the cylinder body through a holding screw, an inner spring leaf mounted in a position in the cylinder body, which is close to the sealed end of the cylinder body, and an outer spring leaf mounted in a position in the cylinder body, which is close to the supporting body. When being mounted, the needed torque is set for the bolt according to the prescriptive torque through adjusting the size and the number of the spring leaves in a torsion spring, and the adjustment is convenient and simple. When the torque of a tightened screw nut reaches the needed torque, the cylinder body bears the same reacting torque and the spring leaves enter an elastic deformation stage at the moment; and due to the elastic deformation, the spring leaves can slide out of a ratchet groove of the cylinder body and rotate relative to the cylinder body, so that the cylinder body stops the selection and the tightened screw nut does not bear force any more.

Description

technical field [0001] The present invention is a divisional application of an invention patent with the application date of "April 11, 2012", the application number of "2012101037057", and the title of "A Constant Torque Device for Pneumatic Wrench". Background technique [0002] Pneumatic wrench is a high-efficiency mechanical tool for disassembling screws and nuts, and it has a wide range of uses in the power industry. In the machinery manufacturing industry, bolts and nuts are used the most besides individual parts on the assembly line. To a large extent, the quality of a product does not lie in the quality of each part, but in the quality of assembly. [0003] At present, the widely used pneumatic wrench in China is generally divided into two categories, one is the conventional impact wrench, and the other is the pulse pneumatic wrench. The difference between the two is that the former cannot determine the torque, while the latter can, but the equipment is expensive. ...

AI Technical Summary

Problems solved by technology

[0003] At present, the widely used pneumatic wrench in China is generally divided into two categories, one is the conventional impact wrench, and the other is the pulse pneumatic wrench. The difference between the two is that the former cannot determine the torque, while the latter can, but the equipment is expensive.

[0004] The assembly workshops of large factories often use high-efficiency pneumatic wrenches to tighten bolts. However, bolts of different specifications and different parts require different torques. Tighten the bolt

Often the final worker exerts too much force, which is greater than the required tightening torque

This not only wastes manpower, but also cannot guarantee the consistency of the torque, and the bolts with relatively small tightening torque are easy to loosen, posing a safety hazard

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