Method and apparatus for grinding rubber

Abstract

A rubber grinding machine and method is provided for ambient temperature grinding of rubber material to form finely ground rubber particles. The rubber grinding machine includes a feed tube, a grinding module, a conveyor, a screening module and a vacuum system. Rubber material is placed in the feed tube which advances the rubber material into the grinding module using a plunger or auger. The grinding module includes a grinding wheel which grinds the rubber material into rubber particles. The grinding wheel is surrounded by a shroud which includes a water-cooled cooling jacket. The water is circulated through the cooling jacket to cool the shroud and its interior. Rubber particles ground by the grinding wheel fall through the bottom of the shroud onto a conveyor which deposits the rubber particles onto the screen module. The screen module includes at least one screen for separating the rubber particles by size. Rubber dust produced by the grinding wheel is processed by a vacuum system and may later be screened.

1 . A rubber grinding apparatus for generating ground rubber particles from rubber material, comprising: 
 a rotatable grinding wheel;    a feeder for advancing rubber material against said grinding wheel;    a shroud enclosing said grinding wheel, said shroud having an aperture for directing ground rubber particles away from said grinding wheel during rotation thereof; and    a cooler in thermal contact with said grinding wheel for cooling thereof    
     
     
         2 . A rubber grinding apparatus according to  claim 1  further including: 
 a mover adjacent said aperture for conveying rubber particles away from said grinding wheel; and  
 a separator adjacent to said conveyor for separating rubber particles based on size.  
 
     
     
         3 . A rubber grinding apparatus according to  claim 2  wherein said mover includes a conveyor belt.  
     
     
         4 . A rubber grinding apparatus according to  claim 2  wherein said mover includes an auger.  
     
     
         5 . A rubber grinding apparatus according to  claim 2  wherein said separator includes a vacuum system for processing airborne rubber dust particles.  
     
     
         6 . A rubber grinding apparatus according to  claim 5  wherein said vacuum system is a cyclone system.  
     
     
         7 . A rubber grinding apparatus according to  claim 1  wherein said feeder includes a feed tube.  
     
     
         8 . A rubber grinding apparatus according to  claim 7  wherein said feed tube includes a plunger for forcing rubber material against said grinding wheel.  
     
     
         9 . A rubber grinding apparatus according to  claim 8  wherein said plunger is pneumatically movable toward said grinding wheel.  
     
     
         10 . A rubber grinding apparatus according to  claim 7  wherein said feed tube includes an auger for forcing rubber material against said grinding wheel.  
     
     
         11 . A rubber grinding apparatus according to  claim 1  wherein said cooler is liquid-cooled.  
     
     
         12 . A rubber grinding apparatus according to  claim 11  wherein said cooler comprises a liquid-filled cavity.  
     
     
         13 . A rubber grinding apparatus according to  claim 12  wherein said cooler includes at least one liquid inlet and at least one liquid outlet to allow circulation of liquid into and out of said cooler.  
     
     
         14 . A rubber grinding apparatus according to  claim 1  wherein said cooler is physically connected to said shroud.  
     
     
         15 . A rubber grinding apparatus according to  claim 2  wherein said separator includes a screen module.  
     
     
         16 . A rubber grinding apparatus according to  claim 15  wherein said screen module includes at least two screens of different mesh sizes.  
     
     
         17 . A rubber grinding apparatus according to  claim 16  wherein said screen module separately outputs rubber particles passing through two screens from rubber particles passing through one screen.  
     
     
         18 . A grinding module including; 
 a grinding wheel;    a shroud surrounding said grinding wheel; and    a cooling jacket thermally coupled to said shroud for cooling said grinding wheel.    
     
     
         19 . The rubber grinding apparatus of  claim 18  wherein said cooling jacket is liquid-cooled.  
     
     
         20 . The rubber grinding apparatus of  claim 18  wherein said cooling jacket comprises a liquid-filled cavity.  
     
     
         21 . The rubber grinding apparatus of  claim 20  wherein said cooling jacket includes at least one liquid inlet and at least one liquid outlet to allow circulation of liquid.  
     
     
         22 . A method for grinding recyclable products comprising the steps of: 
 advancing recyclable material onto a grinding wheel;    grinding said recyclable material with a grinding wheel to produce recyclable particles; and    cooling said grinding wheel using a cooling jacket.    
     
     
         23 . The method of  claim 22  wherein said advancing step includes advancing recyclable material using a plunger.  
     
     
         24 . The method of  claim 22  wherein said advancing step includes advancing recyclable material using an auger.  
     
     
         25 . The method of  claim 22  wherein said cooling step includes cooling using a liquid-cooled cooling jacket.  
     
     
         26 . The method of  claim 22  wherein said cooling step includes cooling using a cooling jacket including at least one liquid inlet and at least one liquid outlet to allow circulation of liquid within the cooling jacket.  
     
     
         27 . A method for recycling rubber material using a grinding wheel comprising the step of: 
 advancing rubber material against a grinding wheel;    grinding said rubber material into rubber particles;    cooling said grinding wheel;    conveying said rubber particles away from said grinding wheel; and    separating said rubber particles based on size.    
     
     
         28 . The method of  claim 27  wherein said cooling step includes cooling using a liquid-cooled cooling jacket.  
     
     
         29 . The method of  claim 27  wherein said cooling step includes cooling using a cooling jacket including at least one liquid inlet and at least one liquid outlet to allow circulation of liquid within the cooling jacket.  
     
     
         30 . The method of  claim 27  wherein said screening step includes screening rubber particles based on size using at least two screens.  
     
     
         31 . The method of  claim 27  further including the step of processing airborne rubber particles using a vacuum system.  
     
     
         32 . A method for producing commercially usable rubber particles from used rubber material conprising: 
 substantially powderizing used rubber material, said powderizing taking place at substantially ambient temperatures.