Roller mill

Details Roller mill Roller mill

1998-07-31

2000-02-08

Rosenbaum, Mark

Solid material comminution or disintegration

Apparatus

Plural rotary or oscillatory surfaces cooperate with common...

2412851, B02C 1504

Patent

active

060219688

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a roller mill, particularly an air-swept mill having a modular construction.
Modular roller mills are relatively large mills with two, three, four or more grinding rollers rolling on a rotating grinding pan. In such modular roller mills use is made of a force unit as module comprising a column with a rocker bearing, rocker, complete grinding roller, rocker seal with respect to a mill casing and a spring suspension unit formed by a spring suspension cylinder with hydraulic accumulators and which force unit can be associated twice with a relatively small grinding pan, thrice with a medium-sized grinding pan and four or more times with a large grinding pan. The modular construction permits adaptation to the particular requirements without any separate constructional expenditure.
FIG. 1 shows in detail a known modular roller mill in side view and without a casing. The grinding rollers 7, which are pivotably mounted in each case with a rocker 8 about a rocker axis 28 of a column 2, roll on a grinding pan 3 driven by means of a driving shaft 27 via a gear 4.
It is a roller mill with two or more grinding rollers, whereof only one grinding roller 7 is visible. Furthermore a rocker unit constituted by a rocker cylinder 6 and a hydraulic accumulator or a gas spring 16 is shown. The columns 2, which are in each case associated with a grinding roller 7, are fixed at their lower end in the vicinity of a mill foundation 13, which is generally a concrete foundation, to a steel foundation frame 5, e.g. by screwing and/or welding.
The known roller mills have in each case one foundation frame 5 per column 2, which is oriented towards a mill centre defined by a longitudinal axis 14 of the roller mill. In the case of a roller mill with two grinding rollers 7 as a result of the extension of the foundation frame 5 of the two diametrically positioned columns 2, a mill foundation frame 18 is obtained connected by the foundation frame 5 of a column 2 to a gear foundation frame 11 in the mill centre and extending through to the foundation frame 5 of the other column 2 and generally the mill gear 4 is anchored by means of an intermediate plate or a gear sole plate 12 to the gear foundation frame 11 and the through mill foundation frame 18.
In the case of a roller mill with three and more than four grinding rollers, a star-shaped mill foundation frame 18 is obtained. Such a star-shaped mill foundation frame 18 is shown in a diagrammatic view in FIG. 3, which is described hereinafter with reference to the solution according to the invention.
In the case of a roller mill with four grinding rollers 7 a cruciform mill foundation frame 18 is obtained, which can be considered as a special form of a star-shaped mill foundation frame.
Although roller mills and in particular air-swept roller mills already have high grinding capacities, limits are placed on a further increase according to the "pantograph principle". This is due to the fact that with larger diameter roller mills and when using more than two grinding rollers with the requisite productive capacity there is also e.g. a rise in the drive power and, apart from the diameter, also the height of the grinding pans must be increased. It is necessary to use a gear with a greater overall height H.sub.G2 (cf. FIG. 2).
There is also an increase in the overall height H.sub.M2 of the grinding pan 3 due to the fluid space below it which must be increased, because with air-swept roller mills with increasing productive capacity the volume flows also rise. The overall height H.sub.S1 of the columns 2 consequently increases by the amount H.sub..DELTA.S and reaches a height of H.sub.S2 according to FIG. 2. A comparison of FIGS. 1 and 2 with respect to the overall heights of the gear 4, grinding pans 3 and columns 2 reveals that the increase in the overall height H.sub..DELTA.S of the column 2 according to FIG. 2 is caused by an overall height increase of the gear 4 and grinding pans 3 of the larger roller mill of FIG. 2.
When using columns having the same cross-section as wi

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