... is an interface of auto-bit-feed remained for rig upgrade.3)Optionally, it can be equipped with ... rotary table and cathead on drill floor are driven through bevel gear box and cardan shaft.drilling rig,land drilling rigs,drilling rig equipment....Parameter Model, drilling rig ... 450Travelling blockYG-170YC-225YC-225YC-450OD of sheaves for hoisting system,mm(in) 100511201524HookYD-170DG-250DG- ...