Torque wrench structure and working principle

Torque wrenches are the most common type of torque tools among many hardware tools. The most important role of torque wrenches is to ensure that the threads are tight and do not damage the threads due to excessive torque. Then the following cast-torque torque wrenches Xiaobian brings you to understand the structure and working principle of the torque wrench produced by Shanghai Zhuheng Electronic Technology Co., Ltd.
 

First, the structure of the torque wrench

Torque wrenches are also called torque wrenches and torque wrenches. It is based on the bending principle of the beam, the bending principle of the torsion bar, and the compression principle of the coil spring. It can measure the torque acting on the nut. The torque wrench has a long elastic rod with a handle at one end and the other end. With a square or hexagonal head, a replaceable sleeve is set on the square head or on the hex head and caught in a steel ball. There is also a long pointer on the top, the scale plate is fixed on the handle, and the scale value is 1N (or kg/m). Before use, first adjust the indicator installed on the wrench to the required torque, and then pull the wrench. When the predetermined torque is reached, the pointer on the indicator will turn to the pin side, and finally the pointer collides with the pin. , Inform the operator via speaker signal or sensor signal.

Second, the working principle of torque wrench

1. After the "Kata" sound is issued by the torque wrench, it indicates that the torque value you have reached has been reached;

2. The “Kata” issued by the torque wrench is generated by its own internal torque release structure. The structure is divided into three structures: a pressure spring, a torque release joint and a torque jack.

3. First set the required torque value on the torque wrench (pressed by the spring sleeve on the top rod to the torque release joint), lock the torque wrench, and start tightening the bolt. When the bolt reaches the torque value (when the torque is greater than the spring pressure), there will be an instantaneous disconnection effect. At the moment when a disjoint effect occurs, a joint strike is made and the “Kata” sound from the metal casing of the wrench is emitted. From this, we can confirm the reminding effect of reaching the torque value (actually the same principle as when we put the 15 degree bend of the arm joint into the iron pipe and then immediately hit the steel pipe).

The above content is the structure and working principle of the torque wrench. In the process of using the torque wrench, we first set a required maximum torque value. When the applied torque reaches the set value, the torque wrench will issue a “Kata” sound or The torque wrench joints are bent at a slight angle, which means that they have already tightened and do not apply any more force.