Aiming at the problem of large volume and heavy weight caused by the large stroke of engineering drilling rigs propulsion system,the research was performed based on its working mechanism,a kind of machine-liquid tandem-connected drilling rig propulsion system was proposed,its working principle was elaborated in detail,and the functional relationship equation between the propulsion dis-placement of drilling rigs and the valve opening of the electro-hydraulic proportional valve was deduced.Theoretical analysis and simu-lation verification show that the machine-hydraulic tandem propulsion system has the characteristics of distance saving rather than force saving.During the working process of the drilling rig,the propulsion speed and displacement of the power head can be twice as much as that of the hydraulic cylinder,and the propulsion force transmitted from the hydraulic cylinder to the power head is half of the output force of the hydraulic cylinder piston,which reduces the length of the drilling rig mast and lowers the volume and weight of the propul-sion system.The propulsion displacement and speed of the power head can be adjusted by adjusting the valve opening through the electro-hydraulic proportional valve,so that the drilling rig propulsion system can meet the needs of different working conditions.
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