As a common component in steel structure joint connection, high-strength bolt plays a very important role in steel structure. High strength bolts are mainly divided into torsion shear high strength bolts and large hexagon bolts. High strength bolts are fastened by electric wrench.

电动扭剪扳手主要用于紧固高强度扭剪螺栓，并且在紧固完成后将剪断的梅花头保留在套筒内部不掉落，随后扣动扳机将梅花头弹出。

The electric torsion shear wrench is mainly used to fasten the high-strength torsion shear bolt, and keep the cut plum blossom head inside the sleeve after fastening, and then pull the trigger to eject the plum blossom head.

由头部和螺杆(带有外螺纹的圆柱体)两部分组成的一类紧固件。

A type of fastener composed of head and screw (cylinder with external thread).

螺栓的连接

Bolted connection

螺栓与螺母配合，用于紧固连接两个带有通孔的元件，属于可拆卸连接。

The bolt is matched with the nut for fastening and connecting two elements with through holes, which belongs to removable connection.

螺栓连接的工作原理

Working principle of bolted connection

胡可定律：固体材料受力之后，材料中的应力与应变（单位变形量）之间成线性关系。

Hooke's Law: after a solid material is stressed, there is a linear relationship between the stress and strain (unit deformation) in the material.

电动扳手的应用

Application of electric wrench

电动扭剪扳手主要用于紧固高强度扭剪螺栓，并且在紧固完成后将剪断的梅花头保留在套筒内部不掉落，随后扣动扳机将梅花头弹出。

The electric torsion shear wrench is mainly used to fasten the high-strength torsion shear bolt, and keep the cut plum blossom head inside the sleeve after fastening, and then pull the trigger to eject the plum blossom head.

电动扭矩扳手主要用于紧固各种有扭力要求的大六角高强螺栓，动力为220v或110v交流电源，带有扭矩控制器，在一定范围内输出扭矩可调。

Electric torque wrench is mainly used to fasten various large hexagon high-strength bolts with torque requirements. The power is 220V or 110V AC power supply, with torque controller, and the output torque is adjustable within a certain range.

近年来，因螺栓紧固不当带来的设备安 全问题屡见不鲜，紧固不足、紧固过量、紧固不均等引起的振动超标、螺栓断裂、部件脱落等设备故障、安全 事故时有发生。

In recent years, equipment safety problems caused by improper bolt fastening are common, and equipment faults and safety accidents such as excessive vibration, bolt fracture and component falling off caused by insufficient fastening, excessive fastening and unequal fastening occur from time to time.

使用电动扭矩扳手控制施工扭矩的重要性

Importance of using electric torque wrench to control construction torque

在施工中，除了剪切力和拉力之外，还会受到：振动、温度、侧向应力（风力、流量、压力等）、负载的改变等其他的一些作用力。

During construction, in addition to shear force and tensile force, it will also be subject to vibration, temperature, lateral stress (wind, flow, pressure, etc.), load change and other forces.

使用电动扭矩扳手控制施工扭矩是很重要的，如果所设定的扭矩值偏小，就会造成紧固不足，螺栓就会因振动或循环载荷而松脱，如果紧固过度，会使法兰转动使钢结构断裂。

It is very important to use the electric torque wrench to control the construction torque. If the set torque value is too small, it will lead to insufficient tightening, and the bolts will be loosened due to vibration or cyclic load. If the tightening is excessive, the flange will rotate and the steel structure will be broken.