Pick, In Particular A Round-Shank Pick

Abstract

The invention relates to a pick ( 10, 11 ), in particular a round-shank pick, for use on a cutting roller, comprising a pick head ( 20 ) and a pick shank ( 40 ) for holding the pick in a pick holder ( 50 ), wherein the pick head of the pick has at least one cutting region ( 20.3 ). Provision is made here for a planar and/or recessed ejection region ( 20.4 ) to be arranged in a central region of the pick head so as to directly or indirectly adjoin the cutting region. The pick has an optimized conveying function for the material to be removed.

1 . A pick ( 10 ,  11 ), in particular a round-shank pick for use on a cutting roller, said pick having a pick head ( 20 ) and a pick shank ( 40 ) for supporting the pick ( 10 ,  11 ) in a pick holder ( 50 ), wherein the pick head of the pick ( 10 ,  11 ) comprises at least one cutting region ( 20 . 3 ), characterized in that a planar and/or hollowed ejection region ( 20 . 4 ) is arranged in a central region of the pick head ( 20 ) connecting indirectly or directly to the cutting region ( 20 . 3 ). 
     
     
         2 . The pick ( 10 ,  11 ) as claimed in  claim 1 , characterized in that the cutting region ( 20 . 3 ) comprises at least one cutting element ( 30 ) which is produced from a hard material, in particular tungsten carbide, and is attached on an end of the pick head ( 20 ) remote from the pick shank on a front side ( 20 . 1 ) of the pick ( 10 ,  11 ) which is aligned in the direction of a feed direction (V) and/or in that the ejection region ( 20 . 4 ) comprises at least one plate-shaped hard material element ( 28 ), in particular produced from tungsten carbide, which connects indirectly or directly to the cutting element ( 30 ). 
     
     
         3 . The pick ( 10 ,  11 ) as claimed in  claim 1  or  2 , characterized in that a deflection region ( 20 . 5 ), which extends toward the front side ( 20 . 1 ) of the pick ( 10 ,  11 ), is arranged indirectly or directly on the ejection region ( 20 . 4 ) of the pick head ( 20 ), and in that a shovel-shaped trough ( 20 . 6 ), which is aligned toward the front side ( 20 . 1 ) of the pick ( 10 ,  11 ), is formed by the cutting region ( 20 . 3 ), the ejection region ( 20 . 4 ) and the deflection region ( 20 . 5 ). 
     
     
         4 . The pick ( 10 ,  11 ) as claimed in one of  claims 1  to  3 , characterized in that the pick head ( 20 ) comprises a carrier portion ( 23 ) which is arranged in the cutting region ( 20 . 3 ) and the ejection region ( 20 . 4 ), and in that the carrier portion ( 23 ) comprises lateral connection faces ( 25 . 1 ,  25 . 2 ) which are arranged on both sides of the carrier portion ( 23 ) in the cutting region ( 20 . 3 ) and/or the ejection region ( 20 . 4 ), the mutual distance between said lateral connection faces, proceeding from the front side ( 20 . 1 ) toward a rear side ( 20 . 2 ) of the pick ( 10 ,  11 ), being reduced. 
     
     
         5 . The pick ( 10 ,  11 ) as claimed in one of  claims 1  to  4 , characterized in that the cutting element ( 30 ) is formed from a fastening piece ( 36 ) which is aligned toward the front side ( 20 . 1 ) of the pick ( 10 ,  11 ) and from an attachment ( 32 ) which is aligned from the fastening piece ( 36 ) toward the rear side ( 20 . 2 ) of the pick ( 10 ,  11 ), in that the cutting element ( 30 ) forms a cutting edge ( 31 ) on the outermost end of the pick head ( 20 ), and in that the cutting element ( 30 ), proceeding from the cutting edge ( 31 ), realizes a diverting face ( 37 ) toward the fastening piece ( 36 ) and a free face ( 33 ) toward the attachment ( 32 ). 
     
     
         6 . The pick ( 10 ,  11 ) as claimed in  claim 5 , characterized in that the fastening piece ( 36 ) realizes a contact face ( 35 ) and the attachment ( 32 ) realizes a support portion ( 34 ) and in that the cutting element ( 30 ), by means of a substance-to-substance bond between the contact face ( 35 ) and a contact region ( 24 . 2 ) and/or between the support portion ( 34 ) and a support region ( 24 . 1 ) of the carrier portion ( 23 ), is held on said carrier portion ( 23 ). 
     
     
         7 . The pick ( 10 ,  11 ) as claimed in one of  claims 1  to  6 , characterized in that the pick head ( 20 ) is coated with an anti-wear coating ( 29 ), in particular with armor welding, in the cutting region ( 20 . 3 ), in the ejection region ( 20 . 4 ) and/or in the deflection region ( 20 . 5 ). 
     
     
         8 . The pick ( 10 ,  11 ) as claimed in  claim 7 , characterized in that the anti-wear coating ( 29 ) is applied to the cutting element ( 30 ) and/or to regions of the carrier portion ( 23 ) bearing the hard material element ( 28 ) at least at a spacing of a minimum distance. 
     
     
         9 . The pick ( 10 ,  11 ) as claimed in one of  claims 5  to  8 , characterized in that the cutting edge ( 31 ) of the cutting element ( 30 ) is arranged in the direction longitudinally of a center longitudinal plane (M) of the pick ( 10 ,  11 ), the surface normal of which points in the direction of the front side ( 20 . 1 ) of the pick ( 10 ,  11 ), in particular in that the cutting edge ( 31 ) is arranged along the center longitudinal plane (M) of the pick ( 10 ,  11 ). 
     
     
         10 . The pick ( 10 ,  11 ) as claimed in one of  claims 1  to  9 , characterized in that the cutting element ( 30 ) comprises on the front side a diverting face ( 37 ) which is formed in a belly-shaped manner, in particular convexly, and/or in that the diverting face ( 37 ) comprises an edge which is aligned toward the front side ( 20 . 1 ) at a first exterior angle and/or in that the cutting edge ( 31 ) comprises a cutting tip ( 38 ) at a second exterior angle and/or in that the free face ( 33 ) comprises an edge at a third exterior angle and/or in that the exterior angles are arranged over a in the direction longitudinally of a second center longitudinal plane of the pick ( 10 ,  11 ) which extends from the front side ( 20 . 1 ) to the rear side ( 20 . 2 ). 
     
     
         11 . The pick ( 10 ,  11 ) as claimed in one of  claims 1  to  10 , characterized in that the pick shank ( 40 ) is realized as a round shank ( 42 ) and in that the pick shank ( 40 ) comprises at least one positive locking element which is suitable to interact with a positive locking counter element of the pick holder ( 50 ) or in that the pick holder ( 50 ) has assignable thereto a blocking piece ( 60 ) as a positive locking counter element which is securable on the pick holder ( 50 ) and in that the pick ( 10 ,  11 ) is securable in an anti-rotational manner on the positive locking counter element by way of the positive locking element. 
     
     
         12 . The pick ( 10 ,  11 ) as claimed in one of  claims 1  to  11 , characterized in that the pick head ( 20 ) comprises a support body ( 27 ) on the side of the pick shank ( 40 ) and in that the support body ( 27 ) is closed off by means of a support face ( 27 . 1 ) which protrudes radially above the pick shank ( 40 ). 
     
     
         13 . The pick ( 10 ,  11 ) as claimed in one of  claims 3  to  12 , characterized in that a deflection face ( 24 . 5 ), which runs from the ejection region ( 20 . 4 ) to the front side ( 20 . 1 ) of the pick head ( 20 ), is formed by means of the deflection region ( 20 . 5 ) and in that the deflection face ( 24 . 5 ), proceeding from a middle region of the pick head ( 20 ) toward the front side ( 20 . 1 ) thereof, falls away in the direction of the pick shank ( 40 ).