Extrusion device

Abstract

An extrusion device for forcing out a mass ( 2 ) from a self-drilling chemical rock anchor ( 1; 46 ) for mine and tunnel constructions and including a motor-driven sleeve ( 21; 56 ) rotatably supported in the housing ( 12; 44 ) without a possibility of an axial displacement therein and having a receiving space ( 28; 58 ) for a free end ( 4 ) of the rock anchor ( 1 ) extending from the receptacle ( 24 ) for the rock anchor rotation-imparting means ( 3 ), which is provided at the first sleeve end ( 22 ), in a direction toward the second sleeve end ( 25 ) of the sleeve ( 21, 56 ) opposite the first end and having an inner cross-section smaller than a cross-section of the receptacle ( 24 ), and a feeding nozzle ( 31 ) extending through the through-opening ( 26 ) formed in the second sleeve end ( 25 ) of the sleeve ( 21 ) for feeding an extruding medium for forcing the mass ( 2 ) out of the rock anchor ( 1 ) and spaced from an inner profile of the sleeve ( 21; 56 ) to provide free space for the free end ( 4 ) of the rock anchor ( 1 ).

1 . An extrusion device for forcing out a mass ( 2 ) from a self-drilling chemical rock anchor ( 1 ;  46 ) for mine and tunnel constructions, the extrusion device comprising a housing ( 12 ;  44 ); a motor-driven sleeve ( 21 ;  56 ) rotatably supported in the housing ( 12 ;  44 ) without a possibility of an axial displacement therein, the sleeve having a first end ( 22 ) with an insert opening ( 23 ) in which there is provided a receptacle ( 24 ) for rotation-imparting means ( 3 ) of the rock anchor ( 1 ;  46 ), a second end ( 25 ) located opposite the first end ( 22 ) and having a through-opening ( 26 ), and a receiving space ( 28 ;  58 ) for a free end ( 4 ) of the rock anchor ( 1 ) extending from the receptacle ( 24 ) for the rock anchor rotation-imparting means ( 3 ) in a direction toward the second end ( 25 ) of the sleeve ( 21 ,  56 ) and having an inner cross-section smaller than a cross-section of the receptacle ( 24 ) for the rotation-imparting means ( 3 ); and a feeding nozzle ( 31 ) extending through the through-opening ( 26 ) of the second end ( 25 ) of the sleeve ( 21 ) for feeding an extruding medium for forcing the mass ( 2 ) out of the rock anchor ( 1 ), the feeding nozzle ( 31 ) being spaced from an inner profile of the sleeve ( 21 ;  56 ) to provide free space for the free end ( 4 ) of the rock anchor ( 1 ).  
   
   
       2 . An extrusion device according to  claim 1 , wherein the receiving space ( 28 ;  58 ) has a cross-section that is greater than a cross-section of the feeding nozzle ( 31 ) from two to four times.  
   
   
       3 . An extrusion device according to  claim 1 , wherein the receiving space has an axial extent (L) along a sleeve axis ( 27 ) that is greater than a mean dimension of the sleeve inner cross-section from two to five times.  
   
   
       4 . An extrusion device according to  claim 1 , further comprising a shank ( 36 ) for securing the extrusion device ( 11 ) in a chuck of a rock drill and operatively connected with the sleeve.  
   
   
       5 . An extrusion device according to  claim 1 , wherein the sleeve ( 56 ) is provided on an outer side ( 57 ) thereof with a drive profile ( 59 ) that provides for driving the sleeve ( 56 ) by the motor ( 42 ) directly or indirectly, via a drive unit.  
   
   
       6 . An extrusion device according to  claim 1 , further comprising a multi-channel feeding unit ( 61 ) for feeding at least one of the flushing water and the extruding medium to the rock anchor.