Full-automatic calibration device for test joints of hydraulic impulse tools

To ensure the optimal performance of hydraulic impulse tools, it is essential to test them on test joints with a controllable torque rate. These test joints must exhibit consistent friction rates, linearity, repeatability, and reproducibility. This article presents the design of a fully automated calibration device for hydraulic pulse tool test joints, detailing its structural principles and automatic control procedures. The calibration device enhances the efficiency of calibrating hydraulic impulse tool test joints, minimises errors from manual operations, and accommodates test joints of varying specifications. Experimental results demonstrate that the device achieves an indication error and repeatability better than 0.3 %, enabling precise calibration of the test joints' measurement characteristics.