No abstract

The utilization of the adjusting device has been shown to significantly enhance the precision and stability of the mechanical vertical drilling tool. However, the inappropriate size of the structural parameters of the adjusting device will greatly affect its performance. Therefore, further improvements are necessary in order to optimize its performance. In order to achieve this, a thorough examination of the working principle and the various factors that influence the adjusting device is crucial. Through simulation and experimental methods, the function of the adjusting device was evaluated and potential solutions for the negative adjusting torque were proposed. By selecting appropriate values for the influencing factors, a more desirable adjusting torque with a reduced range of negative values can be obtained. Through a comparative analysis, the difference before and after optimization was evaluated. Furthermore, it was determined that the negative adjusting torque was caused by a reflux, primarily due to the diameter of the inlet and the flux area of the lower orifices. After optimization, the range of the adjusting torque that was beneficial to the adjusting device was extended to 15°~0°, providing a practical application in the drilling industry and serving as guidance for further optimization of the mechanical vertical drilling tool.