扭剪扳手是一种可测定螺纹扭矩和剪切力的专用工具。其原理是利用弹簧的变形来感测力矩或剪切力，并将其转化为指针上的标度。

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.

　　当扭剪扳手用于螺纹紧固时，通过扳手头与螺母或螺栓的接触面形成的扭矩传递到扭剪扳手的剪切板上，使得剪切板上的受力器件弯曲，剪切板弯曲的程度与扭矩的大小成正比关系。调整可调扭矩限制装置，让剪切板弯曲的角度与设定的扭矩值相对应。此时，指针上的刻度指示器将显示出要求的扭矩值，从而达到控制螺纹紧固力度的目的。

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.

　　当扭剪扳手用于切割切断的工作时，与其配套使用的切割器材通常是设置在剪切板下方，并将力矢引出到等量或等比例的别的测量装置上。利用仰角传感器、压电传感器等原理，来感测剪切板所产生的剪切力，从而达到控制剪切负载的目的。

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.

　　总的来说，扭剪扳手原理是利用弹簧变形、受力器件和剪切板上的传感器来感测扭矩或剪切力，将其转化为指针上的刻度指示器显示出来。同时，可调扭矩限制装置和在剪切板下方设置的测量装置，则可以对扭矩或剪切负载作出控制。

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.

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