對準螺栓扳動電源開關就行。電動扭剪扳手主要是終緊扭剪型高強螺栓的，它的使用就是對準螺栓扳動電源開關，直到把扭剪型高強螺栓的梅花頭打斷為止。
Align the bolt and pull the power switch. The electric shear wrench is mainly used to tighten the shear type high-strength bolt. It is used to pull the power switch against the bolt until the box head of the shear type high-strength bolt is broken.
定轉矩電動扳手的轉矩以電氣裝置來進行控制。這種電動扳手具有耗電量少、噪聲小、調節靈活、能自動停機、轉矩穩定等優點。
The torque of constant torque electric wrench is controlled by electrical device. The electric wrench has the advantages of less power consumption, low noise, flexible adjustment, automatic stop, stable torque, etc.
針對螺栓可能存在的缺陷（如裂紋，夾渣，混料等）磁導率和鋼鐵磁導率的差異，磁化后這些材料不連續處的磁場將發生崎變，形成部分磁通泄漏處工件表面產生了漏磁場。
In view of the difference between the magnetic permeability of the bolt (such as crack, slag inclusion, mixture, etc.) and that of the steel, the magnetic field at the discontinuity of these materials will change after magnetization, forming a magnetic leakage field on the surface of the workpiece at the part where the magnetic flux leaks.
當螺母的端面與工件端面接觸后，阻力矩急劇上升，轉動的螺旋槽使滾珠帶著主動沖擊塊克服摩擦力和工作彈簧的壓力向后移動，使主動沖擊塊與從動沖擊塊互相嚙合的牙脫離嚙合。此時，從動沖擊塊不移動，而主動沖擊塊繼續向后移動。
When the end face of the nut contacts the end face of the workpiece, the resistance torque rises sharply. The rotating spiral groove makes the ball move backward with the active impact block to overcome friction and the pressure of the working spring, so that the teeth that the active impact block and the driven impact block mesh with each other are disengaged. At this time, the driven impact block does not move, while the active impact block continues to move backward.
在轉過從動沖擊塊的牙后，由于工作彈簧的作用使主動沖擊塊瞬時前移，并沿螺旋槽產生一個角加速度，主動沖擊塊撞擊從動沖擊塊，兩牙產生碰撞。然后螺旋槽又使滾珠和主動沖擊塊后移，脫離嚙合。這樣周而復始產生一次又一次的碰撞，獲得所需的沖擊力矩，使螺母緊固。
After rotating the tooth of the driven impact block, the active impact block moves forward instantaneously due to the action of the working spring, and produces an angular acceleration along the spiral groove. The active impact block impacts the driven impact block, and the two teeth collide. Then the spiral groove makes the ball and the active impact block move backward and disengage from engagement. In this way, repeated collisions are generated to obtain the required impact torque and tighten the nut.
