Electric wrench Bai is a wrench driven by power supply or battery. It is a tool for tightening high-strength bolts, also called high-strength bolt gun. It is mainly divided into impact wrench Dao hand, torsion shear wrench, constant torque wrench, angle wrench and angle wrench. The impact electric wrench is mainly used to tighten the bolt, and its use is very simple, which is to align the bolt and pull the power switch.

电动扭剪扳手主要是终紧扭剪型高强螺栓的，它的使用就是对准螺栓扳动电源开关，直到把扭剪型高强螺栓的梅花头打断为止。电动定扭矩扳手既 可初紧又可终紧，它的使用是先调节扭矩，再紧固螺栓。电动转角扳手主要也属于定扭矩扳手的一种，它的使用是先调节旋转度数，再紧固螺栓。电动角向扳手是一 种专门紧固钢架夹角部位螺栓的电动扳手，它的使用和电动扭剪扳手原理一样。

The main purpose of the electric wrench is to finally tighten the high-strength bolt. Its use is to align the bolt and pull the power switch until the plum head of the high-strength bolt is broken. The electric constant torque wrench can be used for initial tightening and final tightening. Its use is to adjust the torque first and then tighten the bolts. Electric angle wrench is also a kind of constant torque wrench. Its use is to adjust the rotation degree first, and then tighten the bolt. The electric angle wrench is a kind of electric wrench specially used to tighten the bolts at the angle of steel frame. Its use is the same as that of the electric twist shear wrench.

单头螺栓扳手适用于铁道线路日常保养和维修的专用工具，它具有轻便机动，快捷等特点，单头螺栓扳手结构简单，操作方便，使用可靠，是理想的作业工具。

The single head bolt wrench is suitable for the special tools for daily maintenance and repair of railway lines. It has the characteristics of portable, efficient and fast. The single head bolt wrench has the advantages of simple structure, convenient operation, safe and reliable use, and is an ideal operation tool.

单头螺栓扳手工作原理：发动机输出旋转扭矩，通过离合器，传动轴，锥齿轮换向减速机构实现旋转扭矩的换向于减速，换向于减速后的扭矩由连接轴传递到有蓄力加力装置作用的冲击加力机构上，然后通过套筒对螺栓上的螺帽实现松开和锁紧作业

Working principle of single head bolt wrench: the engine outputs rotating torque, which is reversed to deceleration by clutch, transmission shaft and bevel gear reversing and reducing mechanism. After reversing, the torque after deceleration is transferred to the impact afterburner with force accumulation and force adding device by connecting shaft, and then loosen and lock the nut on the bolt by sleeve

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