Solid material comminution or disintegration – Apparatus – With separation or classification of material
Patent
1989-09-29
1990-12-11
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
With separation or classification of material
241247, 241294, 241242, B02C 1818
Patent
active
049764713
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus in a machine for the comminution of plastic, wood or similar materials into smaller pieces, for example granules in respect of plastic, and chips in respect of wood etc., with the assistance of knives disposed at one end of a feeder screw, these knives cooperating with a number of preferably fixed counter knives and a grid.
Prior art machines or apparatuses of this type are often designated granulators and have a feeder screw with a core and conventional, subsequently sharpenable and adjustable knives in the cutting tool assembly, whether this is disposed about a part of the feeder screw or at the side thereof. In addition, in the latter case, special driving of the screw is required, as well as special driving of the cutting tool assembly which is often designated quite simply a "cutter". The major drawback inherent in these prior art machines resides in the limited possibilites of influencing machine output capacity and the long down-times on overhaul and repair of, above all, the cutter. In most cases, each machine for manufacturing plastic articles is allocated at least one granulator for comminuting excess material. In many cases, because of the long down-times, and also to some degree insufficient capacity, it has proved necessary to provide more than one granulator to cater for the excess material from production.
The task forming the basis of the present invention is to obviate or at least reduce the above-mentioned drawbacks in the prior art comminution machines.
This task is solved according to the present invention in the apparatus disclosed by way of introduction, in that each knife rotating with the screw has a seat which extends between an end plate and a ring most proximal the end of the screw and fixed therein at the ends, a knife blade adapted to the configuration of the seat and a bar for fixedly clamping the knife blade in the seat.
One advantage afforded by the apparatus according to the present invention resides in the cutter assembly which permits the employment of one or more cutting knives without any need for aftersetting or after-adjustment. In addition, hoods, grids, receptacles etc. are provided with quick couplings which, together with rapid knife replacement, makes for extremely short down-times and, thereby, a considerable reduction of necessary operational stoppages. An apparatus according to the present invention also permits relatively simple adaptation of the machine to other feeding equipment in the production hall. By means of an apparatus according to the present invention, there will be achieved a considerably more rapid through flow through the machine and higher output capacity, and, moreover, large variations in the infed excess material will be accepted without any appreciable - and in most cases without any -influence on the final result which, in most cases, displays a high degree of uniformity in particle size.
The present invention will be described in greater detail below with particular reference to the accompanying Drawings. In the accompanying Drawings
FIG. 1 is a side elevation, partly in section, of one embodiment of an apparatus according to the present invention, a number of parts having been omitted for purposes of clarity.
FIG. 2 is a section taken along the line I--I in FIG. 1 but on a slightly larger scale than FIG. 1.
FIG. 3 shows, on a larger scale, the parts enclosed by the ghosted line III in FIG. 2.
FIG. 4 shows, on a larger scale, the parts enclosed by the ghosted line IV in FIG. 2. Finally,
FIG. 5 shows, partly in section, parts of a further embodiment of an apparatus according to the present invention.
The embodiment of an apparatus according to the present invention shown on the Drawings is a mill or an apparatus for comminuting excess material in the production of plastic articles and is often designated a "granulator". The apparatus is provided with one or more fixed wheels 1 and one or more swivel wheels 2 to allow for ready relocation at and between different production units. The apparatus
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patent: 1902653 (1933-03-01), Lindgren
patent: 2656122 (1953-10-01), Borner
patent: 3865319 (1975-02-01), Hoffman
patent: 4009837 (1977-03-01), Schnyder
patent: 4071198 (1978-01-01), Tetreault
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