Device for holding drill pipe

Abstract

A device for connecting and disconnecting pipe segments of drill pipes, includes an adjustable retaining element in the form of a collar. For firmly holding the pipe segments introduced into the collar, segments acting as clamping jaws are used for retention. The clamping jaws can be adjusted vertically by servo elements for reducing the receiving diameter. The segments have a conical outside contour and a conical guide on the collar and a corresponding conical guide is provided on the collar, so that, when the segments are vertically displaced, the receiving diameter is reduced.

1 . A device for an adjustable vertical holding of drill pipe having a plurality of pipe segments connected to each other in a row by connecting elements, for use on drilling platforms having a removable holder on a rotating table for inserting and removing drill pipe, the device comprising: 
 a retaining element ( 1 ) connected to the drill pipe for installing and removing the connecting elements between the pipe segments and for handling by winches;    wherein the retaining element ( 1 ) is a collar adapted to be placed on the drill pipe, and having elements ( 17 ) in an outer area thereof which allow the retaining element to be connected to the winch;    wherein an interior space ( 4 ) of the retaining element ( 1 ) for receiving the drill pipe has a cylindrical receiving area comprised of vertically adjustable segments ( 5 ) as clamping jaws for changing the receiving diameter,    wherein the adjustable segments ( 5 ) have a conical external contour ( 6 ) and are slidable along a corresponding conical guide ( 7 ) in the collar of the retaining element ( 1 ) to adjust the diameter of the receiving opening ( 4 ),    wherein the clamping hold on the drill pipe being held can be adjusted by means of controllable servo cylinders ( 11 ), which are installed above the segments ( 5 ) and which shift the segments vertically with respect to the collar of the retaining element ( 1 ) for narrowing the receiving opening ( 4 );    wherein the servo cylinders ( 11 ) act by way of ribs ( 9 ) on external areas of the segments, and the ribs on the segments ( 5 ) with corresponding ribs ( 10 ) on the collar of the retaining element ( 1 ) hold a guide rod ( 8 ) for holding, which guides a compressible compression spring ( 14 ) between the ribs ( 9 ,  10 ).    
   
   
       2 . The device according to  claim 1 , wherein the servo cylinders ( 11 ) mounted on the collar of the retaining element ( 1 ) act by way of sleeves ( 13 ) on the ribs ( 9 ) of the segment ( 5 ) to adjust them.  
   
   
       3 . The device according to  claim 1 , wherein the servo cylinders ( 11 ) for adjusting the segments ( 5 ) are compressed-air cylinders mounted on the collar ( 1 ).  
   
   
       4 . The device according to  claim 3 , wherein the compressed air cylinders ( 11 ) are connected to each other.  
   
   
       5 . The device according to  claim 1 , wherein receiving surfaces of the segments ( 5 ) for the drill pipe are formed by inserted clamping elements ( 16 ) with contact surfaces in the form of a sawtooth profile.  
   
   
       6 . The device according to  claim 1 , wherein the retaining element ( 1 ) is a collar which can be opened and locked.