Vacuum-spraying grinder

Details Vacuum-spraying grinder Vacuum-spraying grinder

1977-11-09

1979-12-18

Rosenbaum, Mark

Solid material comminution or disintegration

Apparatus

With temperature modification of material

241275, 308 10, B02C 1900

Patent

active

041790758

ABSTRACT:
A vacuum-spraying grinder in which material to be ground is sprayed by centrifugal force onto an impact surface, comprising a fixed chamber connected to a suction device and housing a target having an annular inwardly directed impact surface with a vertical axis of symmetry of revolution. A rotor is located in the chamber coaxially with the impact surface of the target, and comprises an upper part located at the level of the target in the form of a horizontal disc provided with radial channels communicating with a central feed orifice in the upper part of the disc, and a lower part in the form of a vertical shaft. The shaft of the rotor is supported, driven and guided by a mechanism comprising at least one active radial magnetic bearing whose stator surrounds the shaft over a portion of its height and whose rotor is carried by the shaft, an active axial magnetic stop, radial and axial position detectors, an electric motor whose stator surrounds the shaft over a portion of its height and whose rotor is located on the shaft, and a set of ball bearings mounted around the shaft and on which the shaft rests when it is not in operation.

REFERENCES:
patent: 2609993 (1952-09-01), Planiol
patent: 2918223 (1959-12-01), Eppenbach
patent: 3567141 (1971-03-01), Zbraniborski et al.
patent: 3747998 (1973-07-01), Klein et al.
patent: 3873047 (1975-03-01), Johnson
patent: 3877761 (1975-04-01), Boden et al.
patent: 3955767 (1976-05-01), Hise
patent: 4037886 (1977-07-01), Boden et al.
patent: 4080012 (1978-03-01), Boden et al.

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