Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Patent
1995-07-24
1997-02-11
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
B02C 432
Patent
active
056012420
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a roller press (hereinafter referred to as of the kind described) for the grinding of granular material, and consisting of two or more rollers adjacent ones of which rotate in opposite directions, and where at least between two adjacent rollers, of which at least one is displaceable in a guideway, a grinding bed is formed, and where only one of the two rollers is connected to a driving means.
Roller presses of this kink are well-known and are often used in preference to roller presses incorporating driving means for each roller given that the roller press installation is simpler and less expensive when not all of the rollers are connected to a driving means.
In the case of roller presses not being driven on all rollers, the static load condition is, however, unfavourable since a considerable force reaction is acting at right angles to the guideway of the displaceable roller owing to the fact that the resultant force exerted on the movable roller is not acting parallel to the guideway of the roller, as is the case for rollers incorporating driving means for all roller, hence causing it, instead, to act in a direction which is angularly displaced relatively to the guideway of the roller. This force reaction acting at right angles to the guideway of the rollers will give rise to, particularly in connection with considerable grinding pressures between the rollers, substantial mechanical stress loads at the frame of the roller press, as well as severe wear exposure of the guideway itself, when the displaceable roller is moving to and fro in response to variations in the thickness of the grinding bed.
It is the object of the present invention to provide a roller press by means of which the aforementioned disadvantages are avoided.
According to the invention this is achieved by means of a roller press of the kink described, being characterized in that the guideway for the or each of the displaceable rollers is substantially parallel to the resultant force acting on that displaceable roller.
As a result, virtually of the resultant force acting on the displaceable roller is absorbed solely by means of reaction devices, such as hydraulic cylinders or springs, which are located at the guideway of the roller.
The magnitude of the angle between the line joining the axes of the rollers and the necessary roller guideway, necessary to ensure parallelism between the resultant force on the roller and the guideway of the roller can be calculated on the basis of the following formula for rollers of equal diameter:
In the normal operating environment of the roller presses of the aforementioned kind, the angle will typically be between 0.02 and 0.10, preferably between 0.03 and 0.07.
In embodiments of roller presses where the weight of the displaceable roller and its bearing housings is at least partially carried by the guideway, this weight will contribute marginally to the direction of the resultant force acting on the displaceable roller and the angular orientation of the guideway will be selected accordingly such that the resultant force is substantially parallel to the guideway.
The invention will now be described in further detail with reference to the accompanying diagrammatical drawings, in which:
FIG. 1 shows a first embodiment of the roller press according to the invention; and
FIG. 2 shows a second embodiment of the roller press according to the invention.
FIG. 1 shows a roller press 1 comprising two oppositely rotating rollers 3 and 5 of equal diameter. The roller 3 is displaceably support in a guideway 7, whereas the roller 5 is firmly supported and connected to a not shown driving means. During roller press operation, material is charged via a feed shaft 9, hence forming between the rollers 3, 5 is grinding bed which is ground subject to the compressive stress from the rollers. The driven roller 5 is supplied with the force T (.beta..sub.1 +.beta..sub.2)v which in the illustrated force diagram generates the reaction forces T which relative to the connecting line between the centres
REFERENCES:
patent: 3001390 (1961-09-01), Zimmer
F. L. Smidth & Co. A/S
Rosenbaum Mark
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