Arrangment for fixing a cutter

Abstract

An arrangement for fixing a pick to a cutting tool of a cutting machine includes a pick holder and a rotationally symmetrical pick sleeve, which is detachably fixed against an axial stop by surface pressure in a conical receiving element of the pick holder. The pick sleeve has an axial length that is greater than the axial length of the receiving element of the pick sleeve. A part of the pick sleeve that protrudes with respect to the edge of the receiving element when fixed has, on the outer diameter thereof, a conical bevel, which is inclined inwards.

1 . An arrangement for fixing a pick to a cutting tool of a cutting machine, comprising:
 a pick holder; and   a rotationally symmetrical pick sleeve is detachably fixed against an axial stop by surface pressure in a conical receiving element of the pick holder, the pick sleeve having an axial length which is greater than an axial length of the receiving element of the pick sleeve, wherein a part of the pick sleeve protrudes with respect to an edge of the receiving element when fixed, the part exhibiting at its outer diameter a conical bevel which is inclined inwards.   
     
     
         2 . An arrangement for fixing of a pick according to  claim 1 , wherein an inclination angle of the bevel against a generating line of an outer casing of the pick sleeve is between 15° and 30°, preferably 23°. 
     
     
         3 . An arrangement for fixing of a pick according to  claim 1 , wherein the conical bevel begins at the position of the pick sleeve when it is in contact against the axial stop, directly at the edge of the receiving element. 
     
     
         4 . An arrangement for the fixing of a pick according to  claim 1 , wherein a surface pressure between the receiving element and the pick sleeve is constantly adjusted over the entire axial length of the receiving element, and amounts to at least 150 N/mm2. 
     
     
         5 . An arrangement for the fixing of a pick according to  claim 1 , wherein the pick holder includes a hole, opening into the receiving element, for the introduction of hydraulic oil. 
     
     
         6 . An arrangement for the fixing of a pick according to  claim 1 , wherein the pick sleeve is made of stainless steel, such as X17CrNi 16-2. 
     
     
         7 . A pick arrangement for a cutting tool of a cutting machine, comprising:
 a pick; and   an arrangement for fixing the pick to a cutting tool including a pick holder and a rotationally symmetrical pick sleeve detachably fixed against an axial stop by surface pressure in a conical receiving element of the pick holder, the pick sleeve having an axial length that is greater than an axial length of the receiving element of the pick sleeve, wherein a part of the pick sleeve protrudes with respect to an edge of the receiving element when fixed, the part exhibiting at its outer diameter a conical bevel that is inclined inwards, the pick being in contact on a ring-shaped face surface of the pick sleeve with a ring-shaped contact surface formed at a ring connection, and the diameter of the ring connection does not exceed the outer diameter of the face surface.