High-speed rotating crushing machinery

A drive shafting apparatus suitable for use in machines including a high speed rotating impeller or similar element and a surrounding rotating bowl or similar element, comprising:

• an outer sleeve shaft adapted to be mounted for rotation within said machine and for connection to said surrounding rotating element for rotation therewith;
• an inner sleeve shaft mounted for rotation within said outer sleeve shaft;
• a central, cantilever shaft rigidly connected at one end of said cantilever shaft within said inner sleeve shaft and having substantial radial play within said inner sleeve shaft at the other end of said cantilever shaft, said other end of said cantilever shaft being adapted for connection to said high speed rotating element for rotation therewith;
• and
• damper means about said other end of said cantilever shaft for reducing radial vibration of said cantilever shaft as it rotates through critical speeds and for substantially eliminating whirling of said cantilever shaft and high speed rotating element.

In a centrifugal crushing machine of the type in which an impeller is mounted for rotation within a bowl, the impeller being adapted to project particles of material toward the wall of the bowl, the bowl having a bottom wall extending radially from the impeller and a circumferential wall extending upwardly from the bottom wall, the improvement comprising:

• spaced impact targets arranged circumferentially on said bottom wall between said impeller and said circumferential wall, said targets being spaced radially from said impeller and said circumferential wall and presenting impact surfaces being oriented at an angle to the path of said particles whereby at least a portion of said particles are crushed by impact with said surfaces;
• a first sleeve shaft mounted for rotation within said machine;
• a central cantilever shaft rigidly connected at one end of said cantilever shaft within said first sleeve shaft and having substantial radial play within said first sleeve shaft at the other end of said cantilever shaft, said cantilever shaft being connected to said impeller for rotation therewith;
• damper means about said other end of said cantilever shaft for reducing radial vibration of said cantilever shaft as it rotates through critical speeds and for substantial eliminating whirling of said cantilever shaft and impeller.

In a centrifugal crushing machine of the type in which an impeller is mounted for rotation within a housing, the impeller being adapted to project particles of material toward the wall of the housing, the improvement comprising:

• an impactor mounted within said machine and having a supporting wall extending radially from said impeller;
• spaced impact targets arranged circumferentially on said supporting wall, said targets being spaced radially from said impeller and said housing wall and presenting impact surfaces to particles projected from said impeller, said impact surfaces being oriented at an angle to the path of said particles, whereby at least a portion of said particles are crushed by impact with said surfaces;
• a first sleeve shaft mounted for rotation within said machine;
• a central cantilever shaft rigidly connected at one end of said cantilever shaft within said first sleeve shaft and having substantial radial play within said first sleeve shaft at the other end of said cantilever shaft, said cantilever shaft being connected to said impeller for rotation therewith;
• damper means about said other end of said cantilever shaft for reducing radial vibration of said cantilever shaft as it rotates through critical speeds and for substantially eliminating whirling of said cantilever shaft and impeller.