DE7502452U - Roller mill - Google Patents

Description

ρ 3051

Polyslus AG, Neubeckum

Roller mill

The innovation concerns a * »roller squeegee mill with a grinding table rotatable about its vertical axis, several grinding rollers or pairs of grinding rollers arranged in an even circumferential division around approximately horizontal axes, further with an air supply channel provided below the grinding table level and a device arranged above the grinding rollers to sift through the air laden with grist.

If roller mills of the type mentioned above are built for greater capacities, this is undesirable large overall height and a considerable loss of pressure, since the classifying air supplied below the grinding table level is multiple must be deflected before it enters the classifier loaded with grist. By the well-known Roller mills provided Air guidance is also often thrown into the rising air stream, that has not yet passed the grinding rollers. The known roller squeegee mill, especially larger ones Performance, are thus also with the disadvantage of a relatively poor classifier efficiency and a afflicted with unfavorable controllability.

The innovation is based on the task of designing a roller squeegee mill of the type mentioned at the outset in such a way that that the disadvantages indicated above are avoided.

7502452 28.0S.7S

This object is achieved according to the invention in that the viewing device by several, the individual Grinding rollers or pairs of grinding rollers assigned and arranged next to one another in a corresponding circumferential division Sifter is formed and that on the circumference of the grinding table in the area of the individual grinding rollers or pairs of grinding rollers Air nozzles are provided for a substantially upward flow of air while in the field between the individual grinding rollers or grinding roller pairs, air nozzles for a throttled one directed towards the grinding path Air flow are arranged.

Since as many individual classifiers as there are grinding rollers or pairs of grinding rollers are now provided, so that each grinding unit is assigned a separate classifier arranged relatively close above it, This not only results in a significant reduction in the overall height of the entire roller squeegee mill (connected with a lower machine weight, a smaller construction volume and the possibility of creating larger ones Power units), but one also achieves through the smaller transport height of the ground material as well as through the largely deflection-free guidance of the sifting air a significant reduction in pressure loss as well an improvement in the overall classifier efficiency.

It is particularly advantageous that on the one hand in the area of the individual grinding rollers or pairs of grinding rollers the classifying air flows in an essentially upwardly directed, largely deflection-free flow and thereby directly absorbs the main part of the ground material comminuted by the grinding rollers, while on the other hand, in the area between the individual grinding rollers or grinding roller pairs, there is the throttled air flow is directed towards the grinding track, so that material

7502452 05/28/75

that has not yet passed the grinding rollers, is guided to the grinding path. In this way one prevents that a larger proportion of insufficiently comminuted material is thrown into the air flow rising to the classifiers will.

The roller squeegee mill according to the invention can, for example, be arranged with three in a circumferential division of about 120 ° Grinding rollers or pairs of grinding rollers and with three arranged above these grinding rollers or pairs of grinding rollers Be equipped with classifiers.

Another variant sees four in one division of about 90 ° arranged grinding rollers or pairs of grinding rollers as well as four separators arranged above. Of course are as part of the innovation also roller squeegees with a different number of roller pairs and Separators possible.

The classifiers can be designed as static or dynamic classifiers.

Also with regard to the mounting of the grinding rollers or pairs of grinding rollers are very different within the scope of the innovation constructive solutions are conceivable.

Two embodiments of the innovation are illustrated in the drawing. Show it

1 shows a vertical section through a roller squeegee mill according to the invention;

FIG. 2 shows a horizontal section through the roller squeegee mill according to FIG. 1 (at the level of the axes the grinding rollers);

7502452 05/28/75

Fig. 3 is a section (corresponding to Fig. 2) through

a second embodiment of the innovation;

Fig. ¹ and J 5 are partial sections (in a larger scale) through which the containing region of the air supply nozzles Rollenquetschmühle.

The roller squeegee mill illustrated in FIGS. 1 and 2 includes a roller mill that can be rotated about its vertical axis Grinding table 1, the drive of which is not illustrated in detail. On the grinding table 1 are more even Circumferential division of about 120 °, three pairs of grinding rollers 2a, 2b and 2c are arranged. These revolve around approximately horizontal axes Grinding rollers are held in a manner not of further interest here by means of frames 3 and tie rods 4, the grinding force in a known manner by hydraulic cylinders (with the interposition of resilient and damping members) can be generated.

In the exemplary embodiment illustrated in FIGS. 1 and 2, three separators 5a, 5b and 5c are arranged above the three pairs of grinding rollers 2a, 2b and 2c. These classifiers are in the same circumferential division as the pairs of grinding rollers, i.e. offset from one another by about 120 °, next to one another arranged. Your Grobgutaustragsrohre 6 lead the not yet sufficiently comminuted material to the middle Area of the grinding table 1 back.

The material to be ground is fed in via a feed device 7 and a chute 8 on the middle area of the grinding table 1.

The classifying air is - as can be seen in particular from FIGS. ^ And 5 - through a nozzle 9 a provided below the grinding table level annular channel 10, from which the air is discharged through nozzles 11 and 12

7502452 05/28/75

can kick. The nozzles 11 are located on the circumference of the grinding table 1 in the area of the individual pairs of grinding rollers (e.g. 2a) and allow an essentially unthrottled and upward air flow (arrows 13), through which the comminuted grist is largely free of deflections directly above the relevant Ma ^ Irollenpaar arranged sifter is fed.

In contrast, the nozzles 12 are on the circumference of the grinding table 1 in the area between the individual pairs of grinding rollers arranged and only allow a throttled air flow, which is essentially not upwards, but is directed towards the grinding path (arrows 14). Through this it is ensured that between the pairs of grinding rollers any ground material that has not yet been sufficiently comminuted is first returned to the grinding path, before then, after appropriate comminution, from the rising air stream (arrows 13) to the classifiers to be led.

Said nozzles 11 and 12 are attached to the lower housing 15 of the roller squeegee mill in a sector shape.

In the variant illustrated in FIG. 3, four are arranged at a circumferential pitch of approximately 90 ° Grinding roller pairs 2a, 2b, 2c and 2d are provided, each in a corresponding circumferential division of 90 ° above arranged classifiers 5a, 5b, 5c and 5d are assigned. The following applies to the air flow in the exemplary embodiment 3, what is explained with reference to FIGS. 4 and 5.

7502452 05/28/75

Claims (3)

It has a roller mill with one around its vertical axis rotating grinding table, several evenly spaced around the circumference grinding rollers or rollers arranged on the grinding table and rotating around horizontal axes. Pairs of grinding rollers, furthermore with an air supply duct provided below the level of the grinding plate, as well as one A device arranged above the grinding rollers for the sifting of the air laden with grist, thereby characterized in that the viewing device by several, the individual grinding rollers bzx-j * pairs of grinding rollers (e.g. 2a, 2b, 2c) assigned and arranged next to one another in a corresponding circumferential division Classifier (e.g. 5a, 5b, 5c) is formed and that on the circumference of the grinding table (1) in the area of the individual Grinding rollers or pairs of grinding rollers, air nozzles (11) for an essentially upward air flow (13) are provided, while in the area between the individual grinding rollers or grinding roller pairs Air nozzles (12) are arranged for a throttled air flow directed towards the grinding path. 2. Roller squeegee mill according to claim 1, characterized by three arranged in a circumferential division of about 120 ° Grinding rollers or pairs of grinding rollers (2a, 2b, 2c) and three roughly above the grinding rollers or pairs of grinding rollers arranged classifier (5a, 5b, 5c). 3. Roller squeegee mill according to claim 1, characterized by four arranged in a circumferential division of about 90 ° Grinding rollers or pairs of grinding rollers (2a, 2b, 2c, 2d) and four roughly above the grinding rollers or pairs of grinding rollers arranged classifier (5a, 5b, 5c, 5d). 7502452 05/28/75