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(zhuǎn)矩電動(dòng)扳手的轉(zhuǎn)矩以電氣裝置來進(jìn)行控制。這種電動(dòng)扳手具有耗電量少、噪聲小、調(diào)節(jié)靈活、能自動(dòng)停機(jī)、轉(zhuǎn)矩穩(wěn)定等優(yōu)點(diǎn)。

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(duì)螺栓可能存在的缺陷（如裂紋，夾渣，混料等）磁導(dǎo)率和鋼鐵磁導(dǎo)率的差異，磁化后這些材料不連續(xù)處的磁場(chǎng)將發(fā)生崎變，形成部分磁通泄漏處工件表面產(chǎn)生了漏磁場(chǎng)。

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(dāng)螺母的端面與工件端面接觸后，阻力矩急劇上升，轉(zhuǎn)動(dòng)的螺旋槽使?jié)L珠帶著主動(dòng)沖擊塊克服摩擦力和工作彈簧的壓力向后移動(dòng)，使主動(dòng)沖擊塊與從動(dòng)沖擊塊互相嚙合的牙脫離嚙合。此時(shí)，從動(dòng)沖擊塊不移動(dòng)，而主動(dòng)沖擊塊繼續(xù)向后移動(dòng)。

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(zhuǎn)過從動(dòng)沖擊塊的牙后，由于工作彈簧的作用使主動(dòng)沖擊塊瞬時(shí)前移，并沿螺旋槽產(chǎn)生一個(gè)角加速度，主動(dòng)沖擊塊撞擊從動(dòng)沖擊塊，兩牙產(chǎn)生碰撞。然后螺旋槽又使?jié)L珠和主動(dòng)沖擊塊后移，脫離嚙合。這樣周而復(fù)始產(chǎn)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.