Pole tower bolt electric torque wrench and control method thereof

A torque wrench and control method technology, which is applied to wrenches, screwdrivers, motor tools, etc., can solve the problems of large fluctuations and low torque control accuracy, and achieve the effects of improved accuracy, fast torque response, and high-precision control

Pending Publication Date: 2019-07-09
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the defects of low torque control accuracy and large fluctuations of the existing electric wrench, and

Method used

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  • Pole tower bolt electric torque wrench and control method thereof
  • Pole tower bolt electric torque wrench and control method thereof
  • Pole tower bolt electric torque wrench and control method thereof

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Embodiment Construction

[0047] Below in conjunction with accompanying drawing, technical solution of the present invention will be further described:

[0048] An electric torque wrench for tower bolts of the present invention includes an output shaft, a start-stop switch, a drive motor, a torque control system and a man-machine interface.

[0049] The schematic diagram of the structural connection of the torque control system of the tower bolt electric torque wrench is as follows figure 1 shown.

[0050]The torque control system includes a microcontroller, a current acquisition module, a speed calculation module, a motor drive module and a communication module, and the microcontroller is respectively connected with the current acquisition module, the speed calculation module, the motor drive module and the communication module; The current acquisition module is used to collect the current signal of the motor and transmit it to the microcontroller; the speed calculation module calculates the current ...

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PUM

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Abstract

The invention discloses a pole tower bolt electric torque wrench and a control method thereof. According to the current motor torque and the flux linkage, the motor torque and the flux linkage at thenext moment under different voltage vectors are predicted according to the Eulerian method and a mathematic model of a permanent magnetic synchronous motor, objective function values under the different voltage vectors are calculated according to a wrench target torque value, a stator target flux linkage value and the predicted motor torque value and the flux linkage value at the next moment, andthe voltage vector making an objective function optimal is selected as the voltage at the next moment. A traditional PI regulator is replaced through a prediction model of a stator current and the flux linkage, torque response is fast, and the pole tower bolt electric torque wrench is of good significance to fastening of a pole tower bolt; and by constructing the suitable objective function, everystep of control of a driving motor meets the optimal condition for controlling a target, and the output torque of the pole tower bolt electric torque wrench is controlled in a high-precision mode.

Description

technical field [0001] The invention relates to an electric torque wrench for tower bolts and a control method thereof, belonging to the technical field of electric torque wrench. Background technique [0002] When the tower bolts are fastened, there are high requirements for the fastening torque value and precision. On the one hand, if the torque value is too large, the bolt may be stretched or brittle; on the other hand, if the torque value is too small, the bolt may become loose. In addition, at the height of the transmission tower, the wind disturbance is greater, the tower galloping range increases, and the safety risk is more prominent. Therefore, high-precision torque control is required. [0003] Common electric torque wrench control methods in the prior art are generally current type or impact type. The current of the current type electric wrench rises sharply at the moment of bolt tightening, so the output torque fluctuates greatly. The impact electric torque wr...

Claims

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Application Information

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IPC IPC(8): B25B21/00B25B23/147
CPCB25B21/00B25B23/147
Inventor 伍川李清叶中飞张博杨晓辉吕中宾朱莉陶亚光潘勇姚德贵卢明魏建林谢凯马伦任鹏亮宋高丽李梦丽王超陈钊
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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