Granulating machine

Details Granulating machine Granulating machine

1995-03-16

1996-09-10

Rosenbaum, Mark

Solid material comminution or disintegration

Apparatus

Comminuting mounting means, frames or other normally...

B02C 1900

Patent

active

055537979

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to an arrangement in granulating mills and includes a cutter means with a cutter rotatably mounted in a granulate container and disposed such that during rotation of the cutter the perimeter of its blades is juxtaposed to a cylindrically shaped sieve made from a perforated sheet of material and removably mounted in the container, the perimeter also being accessible to an upper feed opening for the shaped pieces of primarily plastics material that is to be comminuted, this material being supplied to the feed opening from a collection hopper situated above the cutter blades, which are adapted for coaction with at least one cutter bar disposed in the fixed part of the cutter means for comminuting the plastics material. The shaft ends of the cutter are journalled in bearings in a centrally disposed subframe, which is in turn pivotably mounted via a main pivot shaft journalled at either end in mutually opposing main pivot bearings fixed to the primary frame of the mill. The arrangement also includes a high pressure pump for conveying air through a first hose into the lower portion of the container and for conveying the ready milled granulate via a second hose away from the container to a collection point outside the mill.
A problem burdening already known granulating mills of a similar type is that service and cleaning in connection with changing pigment or other material are troublesome and time-consuming, as well as being very laborious, since the components included in the mill have considerable weight, which comes into prominence in the dismantling necessary to get at the mill components which are to be serviced, exchanged or cleaned. It is important that cleaning is carried out very thoroughly when changing pigment or other material, since pieces or granules from a previous comminuting operation with the mill can otherwise loosen and discolour the granulate in a subsequent operation.
The object of the present invention is thus to achieve an arrangement in granulating mills of the kind mentioned in the introduction, where both service and cleaning in connection with changing pigment or other material are substantially facilitated. The distinguishing features required for the invention are disclosed in the accompanying claims.
By reason of the invention there has now been provided an arrangement in granulating mills of the kind mentioned above, and which excellently achieves the inventive intention, while being at the same time relatively cheap and simple in its construction. The arrangement is unique in that all the chief components of the mill (excluding its main frame) are suspended by a shaft, about which they pivot from a closed state to an open state. Since the components are adapted such that their common centre of gravity has its line of action substantially passing through the shaft, this results in that these components will be apparently almost weightless during opening and closing the mill. At the same time, after the mill has been opened by swinging apart the components forming it, all the nooks and crannies of the apparatus become readily accessible for effective cleaning, this better accessibility ensuring that service can be performed more easily than with previously known arrangements. In addition, no special tools for opening up the mill are required, since the parts to be opened are kept together by bayonet-type latches, which can be rapidly opened. This means that the entire service and/or cleaning procedure does not take a long time, which is the case with known mill arrangements, thus enabling very rapid, time-saving procedures. In connection with swinging or tipping the pivotable chief components of the mill to the open state, the granulate container opens automatically, and on termination of the tipping operation, a pivoting shaft for the upper components comprising the cutter and collection hopper, assumes a vertical position, which enables swinging the collection hopper out laterally with the use of practically no force at all.
The invention will now be

REFERENCES:
patent: 3419223 (1968-12-01), Morin
patent: 3756519 (1973-09-01), Reynolds et al.
patent: 4073444 (1978-02-01), Pav
patent: 5435050 (1995-07-01), Alt

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