螺杆式旋冲工具凸轮机构性能测试装置设计及试验研究

Design and Experimental Study on Testing Device for Cam Mmechanism of Rotary-percussive Tool Based on Screw Drill

螺杆式旋冲工具通过增加轴向冲击功能来提高破岩能量的方式,可以有效地提高研磨性强、可钻性差的复杂地层机械钻速。而针对目前螺杆式旋冲工具凸轮机构性能参数缺乏有效的室内测试装置及方法的问题,自主设计了可满足不同凸轮机构类型冲击力、冲击频率和损耗扭矩的测试装置,并开展了静压力、转速、螺旋面数量、冲程高度作用下滚轮—凸轮机构和双凸轮机构的冲击力、冲击频率和损耗扭矩等性能参数的试验研究,明确了冲击力、冲击频率和损耗扭矩参数的变化规律及主要影响因素,获取了冲击力和冲击频率的计算公式,掌握了滚轮—凸轮机构和双凸轮机构在损耗扭矩方面的差异性,为螺杆式旋冲工具的性能参数计算及凸轮机构类型优选提供了理论依据。

By increasing the axial impact function to increase the energy of breaking rock,the rotary-percussive tool based on screw drill can effectively improve the rate of penetration in the complex formations with strong abrasiveness and poor drillability.In view of the problems of lacking the testing device and test method about the performance parameters of cam mechanism of rotary-percussive tool based on screw drill,a new testing device of cam mechanism which can meet the impact force,impact frequency and torque loss of different cam mechanisms has been independently designed and developed.And the performance parameters such as impact force,impact frequency and torque loss of the roller-cam mechanism and double-cam mechanism,have been carried out under the influence of static pressure,rotating speed,the type of cam mechanism,numbers of spiral surface and impact height.Then,the change rules and main influence factors of the performance parameters have been specified.Besides,the formulas for calculating the impact force and impact frequency have been obtained.And the distinction of torque loss between the double-cam mechanism and roller-cam mechanism has been mastered.Thus,it has provided the theoretical basis for the calculation of the performance parameters and the optimization of the cam mechanism type of rotary-percussive tool based on screw drill.