Slip casting is capsule type hydraulic chuck for rig

The utility model discloses a slip casting is capsule type hydraulic chuck for rig, including joining in marriage oil jacket, end cover, driving -disc, overcoat, slips, capsule, spring, spacer and trundle, it establishes in the chuck body outer end to join in marriage the oil jacket cover, end cover fixed mounting is on the chuck, the capsule sets up in the middle of the driving -disc, the slips is located in the middle of the capsule, the spacer sets up between overcoat and capsule, the spring housing is established on the trundle. This slip casting is capsule type hydraulic chuck for rig has following advantage: 1. The clamp force is big, and slips and drilling rod wearing and tearing back can not exert an influence to the clamp force, 2. The clamp force is adjustable, and the clamp force size can be adjusted to the tight oil pressure of adjustable clamp, and is very favourable to the protection drilling rod, when 3. Pressing from both sides tight drilling rod, main shaft bearing atress situation is improve