... ,DC drilling Rigs,drilling machinery Model:ZJ50D, ZJ70D Nominal drilling depth, m:5000,7000. 1)DC Rig adopts AC-SCR-DC drive mode, using DC ... motors to drive drawworks, rotary table and mud pump ... 1600×2Drive modeDC motorHP mud manifold103mm (bore dia.) × 35MPaElectric drive modeAC-SCR-DC,one to one, or one to twoNumber of main ...