Torque wrench - also known as torque wrench or torque wrench. Torque is the product of force and distance. When tightening threaded fasteners such as screws, bolts and nuts, it is necessary to control the applied torque to ensure that the threads are tightened and will not damage the threads due to excessive torque. Torque wrench is used for operation. First, set an upper limit of the required torque value. When the applied torque reaches the set value, the wrench will make a "click" sound or bend a little angle at the wrench connection, which means that it has been tightened and no more force is added.

用扭矩校準儀器校檢液壓扳手前先將扭矩檢測儀裝置前應分別調整標準裝置和液壓扭矩扳手的壓力表的零位。根據液壓板手驅動方軸(套筒)尺寸的大小，選擇與之連接所用的轉換接頭。仔細檢查手動高壓泵輸油管快速接頭是否連接可靠，泵中是否有油。將矩傳感器、工作臺機器轉換接頭與液壓液壓扳手連接，固定在同一軸線上。

Before calibrating the hydraulic wrench with the torque calibration instrument, the torque detector shall be installed, and the zero position of the pressure gauge of the standard device and the hydraulic torque wrench shall be adjusted respectively. Select the adapter used for connection according to the size of the hydraulic wrench drive square shaft (sleeve). Carefully check whether the quick connector of the oil delivery pipe of the manual high-pressure pump is connected reliably and whether there is oil in the pump. Connect the torque sensor, workbench machine adapter and hydraulic wrench and fix them on the same axis.

確認液壓板手校準方向后并且反作用力臂靠的可靠穩(wěn)固，確保在給液壓扭矩扳手施加力的過程中,三者不發(fā)生相互位置移動，就可以開始加載對其進行校檢。

After confirming that the hydraulic wrench is calibrated in the direction and the reaction force arm is reliable, stable and safe, so as to ensure that the three do not move each other in the process of applying force to the hydraulic torque wrench, the loading can be started for calibration.

在檢測過程中按液壓扭矩扳手額定扭矩值正確選擇標準扭矩傳感器的量程。然后按照選定的檢定點逐級平穩(wěn)地施加額定扭矩值，讀出和記錄各點扭矩值，每規(guī)程少進行3次。每次施加額定扭矩值后卸除負載，檢查標準裝置和液壓扭矩扳指示器歸零情況并重新調整零位后繼續(xù)。

During the test, the range of the standard torque sensor shall be correctly selected according to the rated torque value of the hydraulic torque wrench. Then, the torque shall be steadily applied to the rated torque level by level according to the selected verification points, and the torque values of each point shall be read out and recorded for at least 3 times in each regulation. Remove the load after each application to the rated torque value, check the zeroing of the standard device and hydraulic torque wrench indicator, and continue after readjusting the zero position.