High torque automatic fastening device

Abstract

The invention discloses a large-torque automatic fastening device. The large-torque automatic fastening device comprises a power-driven hydraulic pump station (1) and a hydraulic spanner (2). The power-driven hydraulic pump station (1) is communicated with the hydraulic spanner (2) through an oil pipe (3), a pressure relay (4) is connected at the position of an oil outlet of the power-driven hydraulic pump station (1), an oil inlet of the pressure relay (4) is communicated with a high-pressure output oil path of an electro-magnetic reversing valve (1.4) in the power-driven hydraulic pump station (1), and a control port of the pressure relay (4) is electrically connected with and controls an electric magnet of the electro-magnetic reversing valve (1.4). A travel control device which can control the travel of an oil cylinder is arranged on the hydraulic spanner (2). After the structure is adopted, a bolt can be screwed in place accurately, action is fast, efficiency is high and automation can be realized.

Description

technical field [0001] The invention relates to the technical field of mechanical tools, in particular to a high-torque automatic fastening device. Background technique [0002] In the bolt fastening and dismounting operations on some large-scale equipment, the size of the bolts is relatively large, usually above M100, so a hydraulic wrench combined with a hydraulic pump station device is mainly used to tighten and disassemble the bolts. It is usually powered by hydraulic pressure and provides high torque power output, for example, the maximum torque can reach 110000NM. The high-torque fastening device in the prior art includes a hydraulic pump station and a hydraulic wrench connected by oil pipes, wherein the hydraulic wrench includes an oil cylinder assembly, a bracket and a ratchet assembly, and the oil cylinder assembly and the ratchet assembly are installed on the bracket, and the oil cylinder assembly and the ratchet assembly Connect and provide power to the ratchet a...

AI Technical Summary

Problems solved by technology

[0003] 1) Due to the action of the hydraulic cylinder, the ratchet assembly drives the bolt or nut on the bracket to rotate. One stroke realizes the rotation of the bolt or nut by an angle, and the second stroke after the return stroke realizes the rotation of the bolt or nut by an angle. Bolts or nuts are tightened or loosened. However, it is not accurate to control the rotation angle of the ratchet assembly only by the stroke of the oil cylinder; and when tightening the bolts, it is only possible to judge whether the bolts are tightened manually, or whether the bolts can be judged based on whether the cylinder can not be pushed. Tightening is inaccurate; excessive tightening will cause wear to the bolts and the threaded holes that match the bolts, thereby shortening the life, but not tightening in place will cause safety accidents;

[0004] 2) In addition, in order to achieve the purpose of automation, in the prior art, a flow meter is installed at the outlet of the hydraulic pump, and the reversing of the solenoid valve is controlled according to the oil flow of the hydraulic pump, so that the oil cylinder drives the ratchet to reciprocate, but this structure There are also disadvantages: on the one hand, there is leakage in the hydraulic system, and the flow meter also has errors; on the other hand, when the safety value of the relief valve is reached in an instant, part of the hydraulic oil will flow away, so the reading of the flow meter does not match the actual flow. phenomenon, resulting in a large cumulative angle error, which greatly reduces the efficiency of the wrench; on the other hand, the system cannot automatically judge whether the torque has reached the required value, and if the bolt is not tightened tightly, it will cause a safety accident. The longer the use time, the more inaccurate the reading of the flowmeter

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