Granulator for strand materials

Details Granulator for strand materials Granulator for strand materials

1995-07-31

1997-06-03

Rosenbaum, Mark

Solid material comminution or disintegration

Apparatus

Cooperating comminuting surfaces

241242, 2412853, B02C 1816

Patent

active

056346018

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a granulator for strand materials with a feed device for taking up the strand material and conveying it to a subsequent shearing blade roller which rotates contrary to the direction of conveyance of the strand material and operates against a stationary anvil blade, wherein the feed device comprises a lower and an upper feed roller, of which at least one can be driven, wherein a wiper blade is associated with the lower feed roller and wherein the wiper blade and the anvil blade are secured in position on a carrier arranged between the lower feed roller and the shearing blade roller.
Granulators for strand materials, i.e. strands of plastic and rovings etc., of the type described at the outset are known (DE 29 01 018 A1).
The forces occurring on the bearings of the feed device as well as the shearing blade roller during strand granulation are very large and require a construction of the bearings which is of an adequately stable design. In addition, it is important that an extremely fine gap which is exactly adjustable can be provided between the lower feed roller and the wiper blade during operation and an even more exact adjustment is necessary between the shearing blade roller and the anvil blade. Only when these conditions are fulfilled can a high-quality granulate be produced and an interference-free operation of the granulator ensured.
Up until now it has been necessary for cleaning of the granulator, for example when changing the material to be granulated, to dismount or remove the lower feed roller when it is to be ensured that none of the material processed beforehand is carried into the granulate to be processed thereafter.
The possibility of cleaning the shearing blade roller is somewhat better since this does not constantly abut on the anvil blade but essentially releases the anvil blade in the interval between two consecutive cuts of the blade roller.
However, work to be carried out on the carrier for wiper blade and anvil blade has always necessitated the removal of at least the lower feed roller or the shearing blade roller.
The object of the invention is to propose a granulator in which cleaning work is simplified in the region between lower feed roller and carrier or between carrier and shearing blade roller.
This object is accomplished in accordance with the invention, in a granulator of the type described at the outset, in that the lower feed roller is movable between an operating and a non-operating position, wherein in its non-operating position it is arranged at a distance from the carrier and the wiper blade, and that the lower feed roller is lockable in its operating position.
Surprisingly, it has been found that despite the forces occurring in the granulator the feed roller can be designed to be movable between an operating and a non-operating position when this can be securely locked in its operating position.
When the locking means is released, it is possible for the lower feed roller to move out of the operating into the non-operating position, the space between the lower feed roller and the wiper blade thereby being increased at the same time and made accessible for cleaning and other control measures.
When identical strand materials are continuously processed in a granulator, the aspect of improved cleaning capabilities in the region between the lower feed roller and the wiper blade is of secondary importance whereas the ease of maintenance with respect to the shearing blade roller or the associated anvil blade, which is normally subject to wear and tear more quickly than the shearing blade roller, is of greater significance. Alternatively to the first solution, it is possible in this case for the shearing blade roller of a granulator of the type described at the outset to be movable between an operating and a non-operating position, whereby in its non-operating position it is arranged at a distance from the carrier and from the anvil blade, and for the shearing blade roller to be lockable in its operating position.
It is, of course, possible for both the

REFERENCES:
patent: 1603763 (1926-10-01), Griffin
patent: 4061282 (1977-12-01), Walker et al.
patent: 4759248 (1988-07-01), Muller et al.

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