Structure and working principle of torque wrench

1.扭矩扳手结构

1. Torque wrench structure

目前常用的扭矩扳手多为棘轮扭矩扳手及插口扭矩扳手，此类扳手主要由扭矩主弹簧、扭矩调整机构、锁止机构、驱动方头、棘轮、扳头外壳以及手柄等组成，所示。扭矩主弹簧作为扭矩扳手的核心零部件，提供扭矩扳手的力矩，通过改变扭矩珠弹簧受压状态而实现改变所需力矩的大小，其自身精度为。一般用在零部件装配完毕后，用于校准螺栓、螺母的拧紧状况，以达到螺栓、螺母规定的工艺扭矩要求。

At present, most commonly used torque wrenches are ratchet torque wrenches and socket torque wrenches. These wrenches are mainly composed of torque main spring, torque adjusting mechanism, locking mechanism, driving square head, ratchet, wrench housing and handle, as shown in. As the core component of the torque wrench, the torque master spring provides the torque of the torque wrench. The required torque can be changed by changing the compression state of the torque bead spring. Its own accuracy is. It is generally used to calibrate the tightening condition of bolts and nuts after the parts are assembled, so as to meet the specified process torque requirements of bolts and nuts.

2.扭矩扳手工作原理

2. Working principle of torque wrench

对扭矩扳手设置扭矩，即调整了扭矩扳手的弹簧力，使用扭矩扳手刻打扭矩时，将扭矩扳手头部与螺栓相连，对螺栓施加扭矩，由于螺栓对扳手的反作用力尚未达到弹簧弹力，螺栓会持续紧固，待螺栓紧固力达到设定的扭矩时会推动顶推器，棘轮开始工作，头部就以头部定位销为旋转，头部的尾端接触到套管就发出“咔嗒”响声，说明螺栓紧固力已达到设定的扳手力。

Set the torque for the torque wrench, that is, adjust the spring force of the torque wrench. When using the torque wrench to carve the torque, connect the head of the torque wrench to the bolt and apply the torque to the bolt. Since the reaction force of the bolt to the wrench has not yet reached the spring force, the bolt will continue to tighten. When the bolt tightening force reaches the set torque, the ejector will be pushed, the ratchet will start to work, and the head will rotate around the head positioning pin, The tail end of the head makes a "click" sound when it contacts the sleeve, indicating that the bolt tightening force has reached the set wrench force.

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