扭剪扳手是一種可測定螺紋扭矩和剪切力的專用工具。其原理是利用彈簧的變形來感測力矩或剪切力，并將其轉化為指針上的標度。

A torsion wrench is a specialized tool that can measure thread torque and shear force. The principle is to use the deformation of the spring to sense torque or shear force, and convert it into a scale on the pointer.

當扭剪扳手用于螺紋緊固時，通過扳手頭與螺母或螺栓的接觸面形成的扭矩傳遞到扭剪扳手的剪切板上，使得剪切板上的受力器件彎曲，剪切板彎曲的程度與扭矩的大小成正比關系。調整可調扭矩限制裝置，讓剪切板彎曲的角度與設定的扭矩值相對應。此時，指針上的刻度指示器將顯示出要求的扭矩值，從而達到控制螺紋緊固力度的目的。

When a torque wrench is used for thread tightening, the torque formed by the contact surface between the wrench head and the nut or bolt is transmitted to the shear plate of the torque wrench, causing the load-bearing components on the shear plate to bend. The degree of bending of the shear plate is directly proportional to the magnitude of the torque. Adjust the adjustable torque limiting device so that the bending angle of the shear plate corresponds to the set torque value. At this point, the scale indicator on the pointer will display the required torque value, thereby achieving the goal of controlling the tightening force of the thread.

當扭剪扳手用于切割切斷的工作時，與其配套使用的切割器材通常是設置在剪切板下方，并將力矢引出到等量或等比例的別的測量裝置上。利用仰角傳感器、壓電傳感器等原理，來感測剪切板所產生的剪切力，從而達到控制剪切負載的目的。

When a torsion wrench is used for cutting and cutting work, the cutting equipment used in conjunction with it is usually set below the cutting plate and the force vector is led out to other measuring devices of equal quantity or proportion. By utilizing principles such as elevation sensors and piezoelectric sensors, the shear force generated by the shear plate is sensed, thereby achieving the goal of controlling the shear load.

總的來說，扭剪扳手原理是利用彈簧變形、受力器件和剪切板上的傳感器來感測扭矩或剪切力，將其轉化為指針上的刻度指示器顯示出來。同時，可調扭矩限制裝置和在剪切板下方設置的測量裝置，則可以對扭矩或剪切負載作出控制。

In general, the principle of a torsion wrench is to use spring deformation, force devices, and sensors on the shear plate to sense torque or shear force, and convert it into a scale indicator on the pointer to display. Meanwhile, the adjustable torque limiting device and the measuring device set below the shear plate can control the torque or shear load.