Casing rotator

Abstract

Disclosed herein is a casing rotator capable of distributing loads applied to bearings to protect the bearings even though verticality of a casing is not matched with verticality of an intermediate frame or an upper frame of a rotator. The casing rotator includes a lower frame unit, an intermediate frame unit, an upper frame unit, a clamping cylinder, and a post unit. The lower frame unit includes a lower frame, an outrigger, and a retainer portion. The intermediate frame unit includes an intermediate frame, a drive motor, a clamp body, and a drive bearing. The upper frame unit includes an upper frame, a wedge clamp, and an upper bearing. The clamping cylinder is configured to be stretchable. The post unit includes a guide post, a lower guide, a crowd cylinder, and an upper guide.

1 . A casing rotator comprising:
 a lower frame unit comprising a lower frame having a through-hole into which a casing is inserted, an outrigger installed to the lower frame such that the lower frame is horizontally maintained and supported on a bottom, and a retainer portion installed to the lower frame so as to fix the casing inserted into the through-hole;   an intermediate frame unit comprising an intermediate frame located above the lower frame and having a through-hole into which the casing is inserted, a drive motor installed to the intermediate frame, a reduction gear portion for reducing a driving speed of the drive motor and for transferring the reduced speed, a clamp body having a through-hole formed therein such that the casing is inserted into the through-hole and coupled to the reduction gear portion so as to be rotatable by the reduction gear portion, and a drive bearing installed to the intermediate frame so as to support the clamp body;   an upper frame unit comprising an upper frame located above the intermediate frame and having a through-hole into which the casing is inserted, a wedge clamp inserted into the clamp body to grip the casing, and an upper bearing installed to the upper frame so as to support the wedge clamp;   a clamping cylinder configured to be stretchable such that the upper frame is vertically moved, one end of the clamping cylinder being fixed to the upper frame and the other end thereof being fixed to the intermediate frame; and   a post unit comprising a guide post installed to the intermediate frame, a lower guide installed to the lower frame so as to be slidable along the guide post, a crowd cylinder configured to be stretchable such that the intermediate frame is vertically moved, one end of the crowd cylinder being fixed to the lower guide and the other end thereof being fixed to the guide post, and an upper guide fixed to the upper frame so as to guide the guide post when the guide post is vertically moved.   
     
     
         2 . The casing rotator according to  claim 1 , wherein the guide post comprises an upper guide post installed to an upper portion of the intermediate frame so as to be inserted into the upper guide, and a lower guide post installed to a lower portion of the intermediate frame. 
     
     
         3 . The casing rotator according to  claim 2 , wherein:
 the upper guide has a penetrated support hole; and   the post unit further comprises a guide housing for enclosing the upper guide and an elastic member installed to the guide housing so as to be inserted into the support hole and support the upper guide post.   
     
     
         4 . The casing rotator according to  claim 3 , wherein the elastic member is one of a leaf spring, a coil spring, and a rubber. 
     
     
         5 . The casing rotator according to  claim 3 , wherein the elastic member comprises:
 a pressing body for pressing the upper guide post at the support hole;   a hydraulic cylinder having a support spring therein and installed to the guide housing; and   a piston, one end of which is coupled to the pressing body by a hinge, the piston being inserted into the hydraulic cylinder to be supported by the support spring such that the pressing body presses the upper guide post.   
     
     
         6 . The casing rotator according to  claim 1 , wherein:
 the lower guide and the crowd cylinder are integrally formed; and   the outrigger is installed to the lower guide.