Roll mill

Abstract

A roll mill for comminuting and homogenizing viscous masses, in particular for dispersing and uniformly distributing solid particles suspended in a binding agent. The roll mill has at least two rolls pivoted around their longitudinal axes, wherein the rotational axis of the first roll is fixed in place, and the rotational axis of a second roll is movably mounted, as well as at least one pressing device for pressing at least one roll against the other roll. Roll pressing takes place by way of a mechanical-pneumatic pressing device, which has a force transducer and a pneumatic drive. The roll surfaces or process surfaces are made out of a metal-free ceramic material.

1 . A roll mill for comminuting and homogenizing viscous masses, comprising: 
 at least two pivoted around their longitudinal axes, wherein the rotational axis of a first roll is fixed in place, and the rotational axis of a second roll is movable; and    at least one pressing device for pressing at least one roll against the other roll, wherein the pressing device is a mechanical-pneumatic pressing device, the rolls having surfaces made out of a metal-free ceramic material.    
   
   
       2 . The roll mill according to  claim 1 , wherein the pressing device has a force transducer that acts on a moving journal bearing of the movable roll, and a pneumatic drive that acts on the force transducer.  
   
   
       3 . The roll mill according to  claim 2 , wherein the pressing device acting on the movable roll has a first force transducer that acts on a first movable journal bearing of the movable roll, and a first pneumatic drive that acts on the first force transducer, as well as a second force transducer that acts on a second movable journal bearing of the movable roll, and a second pneumatic drive that acts on the second force transducer.  
   
   
       4 . The roll mill according to  claim 2 , wherein the force transducer acts on a forked device with two forked ends, wherein a first of the forked ends acts on a first movable journal bearing of the movable roll, and a second forked ends acts on a second movable journal bearing of the movable roll.  
   
   
       5 . The roll mill according to claims  2 , wherein the force transducer is a lever arrangement.  
   
   
       6 . The roll mill according to  claim 5 , wherein the lever arrangement is a toggle mechanism or a cam plate.  
   
   
       7 . The roll mill according to  claim 1 , wherein the mill is a three-roll mill with three parallel, adjacent rolls including a front roll, a back roll and a middle roll, wherein a rotational axis of the middle roll is fixed in place, while a rotational axis of the front roll used to supply a product and a rotational axis of the back roll used for product removal are movable, and further comprising a front mechanical-pneumatic pressing device for pressing the front roll against the middle roll, and a rear mechanical-pneumatic pressing device for pressing the back roll against the middle roll.  
   
   
       8 . The roll mill according to  claim 7 , wherein the front roll has two journal bearings the front roll being pressed against the middle roll by the two journal bearings, and the back roll has two journal bearings, the back roll being pressed against the middle roll by the two journal bearings.  
   
   
       9 . The roll mill according to  claim 1 , wherein the mill is a three-roll mill, and the rolls are arranged in the form of an L viewed from the side.  
   
   
       10 . The roll mill according to  claim 1 , wherein the rolls have a ceramic cylinder fit onto a hollow metal cylinder.  
   
   
       11 . The roll mill according to  claim 1 , wherein the rolls are internally cooled.  
   
   
       12 . The roll mill according to  claim 1 , wherein the mechanical-pneumatic pressing device has a controller for setting the nip.