초록 ▼

A series of screens for use with a size reduction machine have a tapered apertured wall formed into a frusto-conial shape, with an open wide end and a narrow closed end. All screens of a particular series have a cylindrical section, the same interior depth, outside diameter and angle of the tapered

A series of screens for use with a size reduction machine have a tapered apertured wall formed into a frusto-conial shape, with an open wide end and a narrow closed end. All screens of a particular series have a cylindrical section, the same interior depth, outside diameter and angle of the tapered wall. Despite variations in the material wall thickness, screens of the same series are interchangeable on a size reduction machine and the gap can remain constant without any adjustment to the impeller. Further, a size reduction machine has means external to the machine providing for infinite adjustments to the gap. With previous machines, each time that a screen of a different thickness was used, it was necessary to make an adjustment to the gap in order to maintain the same gap. Further, when an adjustment to the gap is required, that is accomplished by removing the screen and impeller from the machine and inserting spacers onto the shaft.

대표청구항 ▼

A size reduction machine for use in process industries to continuously and precisely reduce the size of particles, while controlling fines, said machine comprising an impeller mounted on a rotatable shaft, a motor to rotate said shaft and impeller, so that a tip speed of the impeller ranges from one

A size reduction machine for use in process industries to continuously and precisely reduce the size of particles, while controlling fines, said machine comprising an impeller mounted on a rotatable shaft, a motor to rotate said shaft and impeller, so that a tip speed of the impeller ranges from one meter per second to seventy-five meters per second, said shaft and impeller being located in a channel having an input and output, said channel containing a support, a screen having a tapered apertured wall formed into a frusto-conical shape, with a wide end of said screen being open and a narrow end being at least partially closed, a circular flange surrounding and extending outwardly from said wide end, said screen being designed to be located in said channel and held rigidly within said support so that any particles passing from said input to said output pass through said screen, said impeller being shaped and mounted so that a gap between an edge of said impeller and an interior of said screen remains substantially constant as said impeller rotates relative to said screen, more than half of that part of said shaft located within said channel being rotatably mounted in a spindle housing, said spindle housing being mounted so that its position can be adjusted longitudinally relative to said screen by means external to said channel.