电动扳手的维护：
Maintenance of electric wrench:
目前市面上销售的电动扳手种类较多，维护事项还真不一样。
At present, there are many kinds of electric wrenches on the market, and the maintenance matters are really different.
共同的：
collective:
1.注意检查接入电压，如果电压不稳需要加稳压器。
1. Pay attention to check the access voltage. If the voltage is unstable, add a voltage regulator.
2.注意检查扳手电源线，不能有破损。
2. Pay attention to check the power cord of the wrench, and there shall be no damage.
3.注意外观的紧固螺钉是否松动。
3. Pay attention to whether the fastening screws of the appearance are loose.
4.双重绝缘工具不需要接地，非双重绝缘工具接漏电保护器。
4. Double insulated tools do not need to be grounded, and non double insulated tools are connected to leakage protector.
5.单相串激电机注意碳刷磨损情况，及时更换。
5. Pay attention to the wear of carbon brush of single-phase series motor and replace it in time.
电动定扭扳手分为电流式和动态扭矩感测器式两种，由控制器和拧紧轴组成。电流式定扭扳手根据电机拧紧过程中电流值的变化来判断扭力值，当达到预定扭力时，电机停止工作。动态扭矩感测器式是在拧紧轴上安装有感测器，时刻监测扭力值的变化，当达到预定扭力时，电机停止工作。
Electric fixed torque wrenches are divided into current type and dynamic torque sensor type, which are composed of a controller and a tightening shaft. The current type constant torque wrench judges the torque value according to the change of the current value during the tightening process of the motor. When the predetermined torque is reached, the motor stops working. The dynamic torque sensor type is a sensor installed on the tightening shaft to constantly monitor the change of the torque value. When the predetermined torque is reached, the motor stops working.
电动扭矩扳手具有精度高（±2%）、故障率低、寿命长、可程式，可对扭力和角度控制、可多种扭力选择的优点。因为拧大扭矩螺栓会有反作用力，所以一般在大扭矩拧紧工件上都会设计反作用力臂，防 止操作人员出现事故
The electric torque wrench has the advantages of high accuracy (± 2%), low failure rate, long service life, programmability, torque and angle control, and multiple torque selection. Because there will be reaction force when tightening bolts with high torque, reaction force arm is generally designed on the workpiece with high torque to prevent operators from safety accidents
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