電動扳手的維護：
Maintenance of electric wrench:
目前市面上銷售的電動扳手種類較多，維護事項還真不一樣。
At present, there are many kinds of electric wrenches on the market, and the maintenance matters are really different.
共同的：
collective:
1.注意檢查接入電壓，如果電壓不穩需要加穩壓器。
1. Pay attention to check the access voltage. If the voltage is unstable, add a voltage regulator.
2.注意檢查扳手電源線，不能有破損。
2. Pay attention to check the power cord of the wrench, and there shall be no damage.
3.注意外觀的緊固螺釘是否松動。
3. Pay attention to whether the fastening screws of the appearance are loose.
4.雙重絕緣工具不需要接地，非雙重絕緣工具接漏電保護器。
4. Double insulated tools do not need to be grounded, and non double insulated tools are connected to leakage protector.
5.單相串激電機注意碳刷磨損情況，及時更換。
5. Pay attention to the wear of carbon brush of single-phase series motor and replace it in time.
電動定扭扳手分為電流式和動態扭矩感測器式兩種，由控制器和擰緊軸組成。電流式定扭扳手根據電機擰緊過程中電流值的變化來判斷扭力值，當達到預定扭力時，電機停止工作。動態扭矩感測器式是在擰緊軸上安裝有感測器，時刻監測扭力值的變化，當達到預定扭力時，電機停止工作。
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.
電動扭矩扳手具有精度高（±2%）、故障率低、壽命長、可程式，可對扭力和角度控制、可多種扭力選擇的優點。因為擰大扭矩螺栓會有反作用力，所以一般在大扭矩擰緊工件上都會設計反作用力臂，防 止操作人員出現事故
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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