With the progress of science and technology and the rapid development of the industry, the use and requirements of torque wrench are becoming more and more common and accurate. From the traditional torque wrench, set ratchet torque wrench, digital display torque wrench and preset torque wrench have gradually evolved. Although their categories are different, their principles are roughly the same. Next, let's talk about the principle of torque wrench.

扭力扳手原理

Principle of torque wrench

扭力扳手发出卡塔声音的原理很简单，扭矩扳手在发出“卡塔”声后是提示已达到你要求的扭矩值了；扭矩扳手所发出的“卡塔”是由本身内部的扭矩释放结构产生的，其结构分为压力弹簧、扭矩释放关节、扭矩顶杆三结构所组成。首先在扭矩扳手上设定所需扭矩值（由弹簧套在顶杆上向扭矩释放关节施压），锁定扭矩扳手，开始拧紧螺栓。当螺栓达到扭矩值（当使用扭力大于弹簧的压力）后，会产生瞬间脱节的效应。在产生脱节效应的瞬间发出关节敲击，扳手金属外壳所发出的“卡塔”声。由此来确认达到扭矩值的提醒作用（其实就象我们手臂关节成15度弯曲放在铁管里瞬间申直后会碰到钢管的原理一样）。

The principle that the torque wrench makes a click sound is very simple. After the torque wrench makes a "click" sound, it indicates that the torque value you require has been reached; The "lata" emitted by the torque wrench is generated by its own internal torque release structure, which is divided into three structures: pressure spring, torque release joint and torque ejector rod. First, set the required torque value on the torque wrench (press the torque release joint by the spring sleeve on the ejector rod), lock the torque wrench and start tightening the bolts. When the bolt reaches the torque value (when the torque used is greater than the pressure of the spring), it will produce the effect of instantaneous disconnection. At the moment of disjointed effect, the joint knock and the "Kata" sound emitted by the metal shell of the wrench are sent out. This is to confirm the reminder effect of reaching the torque value (in fact, it is the same as the principle that our arm joints will touch the steel pipe after being bent at 15 degrees and placed in the iron pipe for instant straightening).

扭力扳手的使用要点

Key points of torque wrench

1、按所需定力数值，选择相应的并经校验合格的定扭矩扳手，不准使用没有经过校验的定扭矩扳手；

1. Select the corresponding constant torque wrench that has passed the calibration according to the required constant torque value, and it is not allowed to use the constant torque wrench that has not been calibrated;

2、要用平衡、缓慢的力扭转扳手，不能急扭，手握住定扭矩扳手手柄中间点，垂直于扳手中 心线拉动手柄，直到达到所要求的力矩为止，不允许随意手握根部和端点；

2. A balanced and slow torque wrench shall be used instead of quick torque. Hold the middle point of the handle of the constant torque wrench and pull the handle perpendicular to the center line of the wrench until the required torque is reached. It is not allowed to hold the root and end points at will;

3、不要施加大于定扭矩扳手额定值的扭矩，不准用定扭矩扳手拆卸螺栓或螺母，定扭矩扳手只能顺时针转动；

3. Do not apply torque greater than the rated value of the constant torque wrench. Do not use the constant torque wrench to remove bolts or nuts. The constant torque wrench can only rotate clockwise;

4、用定扭矩扳手拧紧螺栓时，应尽可能不使用转接器，非用不可时，必 须遵守下列要求：转接器有各种不同形状时，可合理选用；为减少拧紧力矩误差，转接器长度应小于定扭矩扳手长度；连接转接器时，其中 心线应和扳手中 心线成一条直线，若需要也可使用轴线偏移的转接器，但大不超过15°角。

4. When tightening bolts with a constant torque wrench, the adapter shall not be used as far as possible. When it is not necessary to use, the following requirements must be observed: when the adapter has various shapes, it can be reasonably selected; In order to reduce the error of tightening torque, the length of adapter shall be less than that of constant torque wrench; When connecting the adapter, the center line shall be in line with the center line of the wrench. If necessary, the adapter with axis offset can also be used, but the angle shall not exceed 15 °.

5、不允许将定扭矩扳手当做普通扳手使用，如用来拧松螺母或螺栓等；

5. It is not allowed to use the constant torque wrench as an ordinary wrench, such as to loosen nuts or bolts;

6、右扭矩定扭矩扳手不能左旋，而左扭矩定扭矩扳手也不能右旋；

6. The right torque constant torque wrench cannot rotate left, and the left torque constant torque wrench cannot rotate right;

7、不能用镀铬的定扭矩扳手和转接扳手接触钛及合金制的螺栓或产品结构；

7. Do not use chrome plated constant torque wrench and adapter wrench to contact titanium and alloy bolts or product structure;

8、定扭矩扳手施加的扭矩不允许超过定扭矩扳手的额定扭矩值。

8. The torque applied by the constant torque wrench shall not exceed the rated torque value of the constant torque wrench.

扭力扳手原理及其使用要点就给大家介绍到这里了，大家在使用大规格扭矩扳手时，可外加接长套杆以便操作省力，若是长时间不使用，就应该把调节标尺刻线退至扭矩小数值处。

The principle of torque wrench and its key points of use are introduced here. When using large-size torque wrench, you can add an extension sleeve rod to save labor in operation. If you don't use it for a long time, you should return the scribed line of the adjustment scale to the small value of torque.