The working principle of the torque wrench is that the power of the motor is transferred from the planetary gear deceleration mechanism to the influence head, and the influence head and two convex heads drive the rotating shaft of the wrench claw, and then complete the power output.

　　扭矩扳手使用一段时间后，其输出功率必然会下降。随着扳手使用时间的增加，输出功率会不断下降，直无法工作为止。

　　When the torque wrench is used for a period of time, its output power will inevitably decrease. With the increase of wrench usage time, the output power will continue to decline until it can not work.

　　电动扭矩扳手

　　Electric Torque Spanner

　　通过对电动转矩扳手的解体观察，技术人员发现，所有使用过的转矩扳手无一例外地在工作面遭受了严重磨损。磨损工作面是与原工作面成45度角的斜面。冲击力分散后，扭矩扳手内件受力也发生变化。

　　By observing the disintegration of the electric torque wrench, technicians found that all the used torque wrenches suffered serious wear and tear in the working face without exception. The worn working face is an inclined plane with an angle of 45 degrees from the original working face. When the impact force is dispersed, the internal force of the torque wrench also changes.

　　电动扭矩扳手

　　Electric Torque Spanner

　　通过以上观察结论，找出了电动扳手失效的主要原因——轴工作表面磨损严重。因此，要有效地延长电动扳手的使用寿命，就必须磨损问题，而由于模具轴上的磨损比冲击头更严重，因此模具轴上的磨损问题是关键。如果能这个问题，就能冲击头磨损问题。更换整体杠杆轴拆卸，杠杆轴工作面可拆卸。使用一段时间后，可根据磨损情况进行更换。可移动工作面可单独选择合适的材料，通过合理的加工工艺，达到较高的机械性能。

　　Through the above observation conclusion, the main cause of the failure of electric wrench - serious wear on the working surface of the shaft was found out. Therefore, in order to prolong the service life of the electric wrench effectively, it is necessary to solve the problem of wear. Because the wear on the die shaft is more serious than that on the impact head, the wear on the die shaft is the key. If this problem can be solved, the problem of impact head wear can be solved. Replace the integral lever shaft and disassemble. The lever shaft working face can be disassembled. After using for a period of time, it can be replaced according to the wear condition. Movable working face can select suitable materials independently and achieve higher mechanical properties through reasonable processing technology.

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