Intelligent electric torque wrench

Abstract

The invention discloses an intelligent electric torque wrench and belongs to the technical field of electric torque wrenches. The intelligent electric torque wrench comprises a mechanical switch, a speed change mechanism, a speed reduction mechanism, a wrench output shaft and a counterforce arm and further comprises a torque control system. The torque control system comprises a power source, a voltage sensor module, a power control module, the mechanical switch, a motor, a current sensor module, a microprocessor module, a display module and a keyboard input module, wherein torque-power relationship data are stored in the microprocessor module; a normally-open contact closing signal of the mechanical switch is transmitted to the microprocessor module; the microprocessor module inquires the torque-power relationship data according to a required torque value so as to obtain the power value of the motor and drives the power control module; the motor rotates according to the power value controlled by the power control module. The intelligent electric torque wrench is high in anti-jamming capacity, and the output torque control precision of the wrench is improved.

Description

[0001] The patent application of the present invention is a divisional application with the application number: 201410134771X. The application date of the original application is: April 3, 2014. The name of the invention is: an intelligent electric torque wrench, a torque control system and its control method. technical field [0002] The present invention relates to the technical field of electric torque wrench, and more specifically, relates to an intelligent electric torque wrench. Background technique [0003] Electric torque wrench is usually used in occasions where bolts or nuts are disassembled and assembled with high torque and high precision of tightening torque. Electric torque wrenches in the prior art can be divided into two types: current speed type and dynamic torque sensor type. The current speed electric torque wrench judges the torque value according to the current value and speed change of the motor during the bolt tightening process, and the motor stops wo...

AI Technical Summary

Problems solved by technology

The controller in this application selects the current working range suitable for the electric wrench according to the preset torque value, and controls the conduction angle of the thyristor to control the current delivered to the wrench motor in the current working range. This torque control unreliable method

[0006] In addition, in the process of tightening the nut, due to the influence of the change of the friction force of the threaded connection pair, the influence of many factors such as the use environment, the tightening torque value will be different, which requires timely torque calibration of the wrench. At present, the electric torque wrench The calibration of the wrench is usually performed by professionals in the manufacturing and assembly plant, so that the torque calibration cannot be performed in time during the actual use of the wrench, and the exact torque value of the wrench cannot be grasped.

To sum up, the torque control of the existing electric torque wrench fluctuates greatly and does not have the function of torque calibration

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