drilling rig,land drilling rigs,drilling rig equipment Model:ZJ30L, ZJ40L, ZJ40L,ZJ70 ... cathead or hydraulic cathead.4)The arrangement mode of high front-low back is adopted, the drawworks, power and drive system ... driven through bevel gear box and cardan shaft.drilling rig,land drilling rigs,drilling rig equipment....Parameter Model, drilling rig ZJ30L ...