Contrast device for the grinding of products held between centres

Abstract

A contrast device for the grinding of products, particularly but not exclusively cylinders, held between centres, wherein a grinding machines ( 21 ) comprise a holding structure ( 20 ) equipped with a grinding wheel ( 24 ) to which a cylinder to be processed ( 22 ) is opposed, and the contrast device ( 23 ) is situated on the opposite side of the cylinder ( 22 ) with respect to the grinding wheel ( 24 ), the contrast device ( 23 ) comprising a slide ( 25 ) assembled on a short pipe ( 26 ) sliding inside a body ( 27 ) of the contrast device ( 23 ) by an interposed actuator ( 28, 35 ), there also being a blocking element ( 29 ) of the relative position of the short pipe ( 26 ) with respect to the body ( 27 ) and an irreversible blocking device ( 31, 32, 33 ) of the position of the pipe ( 26 ) with respect to the cylinder ( 22 ).

1 . A contrast device for the grinding of products, for example cylinders, held between centres, wherein said grinding machines ( 21 ) comprise a holding structure ( 20 ) equipped with a grinding wheel ( 24 ) to which a cylinder to be processed ( 22 ) is opposed, and at least one contrast device ( 23 ) is situated on the opposite side of the cylinder ( 22 ) with respect to the grinding wheel ( 24 ), the contrast device ( 23 ) comprising a slide ( 25 ) assembled on a short pipe ( 26 ) sliding inside a body ( 27 ) of the contrast device ( 23 ) by an interposed actuator ( 28 ,  35 ), there also being a blocking element ( 29 ) of the relative position of the short pipe ( 26 ) with respect to the body ( 27 ) and an irreversible blocking device ( 31 ,  32 ,  33 ) of the position of the pipe ( 26 ) with respect to the cylinder ( 22 ). 
     
     
         2 . The contrast device according to  claim 1 , characterized in that said blocking element ( 29 ) is a piston. 
     
     
         3 . The contrast device according to  claim 1 , characterized in that said interposed actuator consists of an expandable annular chamber ( 35 ) defined between bellows ( 28 ), which surrounds an end of said short pipe ( 26 ) and is constrained at its ends to said short pipe ( 26 ) and to said body ( 27 ) of the device, said chamber ( 35 ) being connected to a control system ( 34 ) of the contrast device ( 23 ). 
     
     
         4 . The contrast device according to one or more of the previous claims, characterized in that said blocking piston ( 29 ) of the relative position of the short pipe ( 26 ) with respect to the body ( 27 ), is of the simple effect type and is situated in a normal position with respect to a longitudinal axis ( 30 ) of the contrast device ( 23 ). 
     
     
         5 . The contrast device according to one or more of the previous claims, characterized in that said irreversible blocking device of the position of the short pipe ( 26 ) with respect to the cylinder ( 22 ) comprises a screw ( 31 ) which rotates inside a screw die ( 32 ), integral with the rear end of the body ( 27 ) is activated by a motor ( 33 ) and rests on a bottom of said short pipe ( 26 ). 
     
     
         6 . The contrast device according to one or more of the previous claims, characterized in that said slide ( 25 ) is made of a material with a low friction coefficient. 
     
     
         7 . The contrast device according to one or more of the previous claims, characterized in that it is arranged in a certain number on the opposite side with respect to said grinding wheel ( 24 ).