Solid material comminution or disintegration – Apparatus – Including means applying fluid to material
Patent
1990-06-01
1993-02-02
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
Including means applying fluid to material
241 97, 241171, 241172, B02C 1716
Patent
active
051832151
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a grinding appliance, especially for grinding material in the form of flowable or pasty non-flowable conglomerates, consisting of a housing having an inlet chamber, a grinding chamber for receiving grinding balls and an outlet, of a rotatably mounted agitator body arranged in the grinding chamber and of a drive for the agitator body.
In a known grinding apparatus of the type mentioned (EP-A-0,015,647), the inlet chamber is preceded by an open filling funnel, to which the grinding material is introduced in batches or continuously. The grinding material passes from the filling funnel into the inlet chamber, out of which it is conveyed into the grinding chamber by means of a conveyor worm and a centrifugal pump. The conveyor worm, the centrifugal pump and the agitator body are arranged on the same shaft and can therefore only ever be driven at the same rotational speed. Since the rotational speed of the agitator body is predetermined within relatively narrow limits, in the known grinding appliance it is possible to execute only a grinding program by which the most diverse grinding materials are treated during approximately the same dwell time.
SUMMARY OF THE INVENTION
A further disadvantage of the known grinding appliance is that, as a result of the pump device, e.g. a conveyor worm, following the inlet chamber, there are parts within the grinding appliance which soil easily and can only be cleaned with difficulty if the appliance is to be changed over to a different grinding material. Finally, the known grinding appliance also has a considerable dead volume, so that not inconsiderably quantities of grinding material are left behind in the grinding appliance after completion of the grinding process.
A grinding appliance having a grinding chamber, a rotatably mounted agitator body and a drive for the agitator body is admittedly already known (DE-A-1,212,825), the grinding chamber being preceded by a pump connected into a feed for the grinding material. As a result of the pressure, generated by the pump, on the grinding material, the conveyance of the grinding material can be controlled independently of the rotational speed of the agitator body. Nevertheless, the two other disadvantages mentioned above remain, namely the easy soiling and difficult cleaning of the parts and the existence of a considerable dead volume within the grinding appliance.
The object on which the invention is based is to provide a grinding appliance of the type mentioned at the outset, by means of which the conveyance can be controlled in a simple way independently of the rotational speed of the agitator body, an easy cleaning of the parts within the grinding appliance is permitted as well as a minimal dead volume.
A first solution achieving this object consists in that in a grinding appliance of the type mentioned at the outset, the inlet chamber is preceded by a pneumatic conveyor device, by means of which the grinding material can be pressed through the inlet chamber and the grinding chamber as far as the outlet.
This solution is suitable for every grinding material in the form of flowable or pastry, non-flowable conglomerates. It is used especially wherever the conditions of a pneumatic connection exist.
As a result of the construction according to the invention, the most diverse grinding programs can be executed with the simplest possible means, because the pressure device can be subjected to the most diverse pressures independently of the rotational speed of the agitator body. To that extent, the particular program can be adapted as closely as possible to the grinding material to be treated. Furthermore, in the construction according to the invention, there is no need for a conveyor worm following the inlet chamber or a centrifugal pump, since the conveyance can be carried out solely by means of the pressure device. This does away with the easily soiled parts inside the grinding appliance, which can be cleaned only with difficulty when the appliance is to be changed over to a
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patent: 3957210 (1976-05-01), Durr
patent: 4308998 (1982-01-01), Wood
patent: 4394980 (1983-07-01), Marz et al.
patent: 4834301 (1989-05-01), Inkyo et al.
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