DE1054809B - Roller mill - Google Patents

Description

GERMAN

In roller mills for grinding cereal products, the grist usually falls in the form of a Veil of uniform thickness in the grinding gap formed by a pair of rollers, in which it passes through the mutual displacement of each other in the gap in the same direction, but with different peripheral speeds moving rollers is crushed. The amount of material falling is in relation to the circumferential speed the rollers are dimensioned so that they are smooth from these, i.e. H. without congestion in front of the grinding gap, is let through.

Experience has shown, however, that there is no corresponding increase in the peripheral speeds of the grinding rollers More power of the roller frame connected, so that the efficiency drops in percentage terms. To According to the result of an investigation, this is caused by the roll surfaces entrained Air currents meet in the inlet angle of the roller pair, accumulate here and close unite a backward air flow that counteracts the inflow of grist. This air flow increases in strength when the roller speed is increased and then inhibits the inflow of Regrind to a correspondingly greater extent.

In order to remedy this drawback, according to the invention is in the area of one or each roller of a pair on the material inlet side in the vicinity of the grinding gap one that extends over the entire length of the roller provided in the manner of a stripper designed deflector that touches the roller or faces it closely and intercepts an air flow entrained by the roll surface and diverts it so that it does not obstruct the flow of grist to the grinding gap. The air captured in this way can pass through a suction line or some other device.

Each deflector may have a hook-shaped end portion extending in the direction of rotation of the roller 15 to 40 ° in front of the Maihlspalt approaches or comes close to the upper roller hub and here the one on the roller surface entrains entrained air layer and reverses or otherwise distracts so that it does not meets the grist to be moved to the point of contact.

Deflectors serving the stated purpose can be designed and arranged in various ways. For example, they can contain air lines through which the air is discharged.

Sealing strips or brushes have already been placed against the rollers of roller mills in order to be able to the contact points to prevent the fall of ground material and the passage of suction air and to others Set the suction to extract the grist that has passed through the rollers to the full permit. An interception of on the roller surfaces

Applicant:

Henry Simon Limited,
Stockport, Cheshire (UK)

Representative: Dipl.-Ing. A. Trautmann, patent attorney,
Berlin-Zehlendorf, Prinz-Handjery-Str. 68

Claimed priority: Great Britain July 13, 1956 and May 27, 1957

John Stephen Ball and Thomas Harold Gillett ₁
Stockport, Cheshire (UK),
have been named as inventors

Air currents entrained by friction before reaching the material flow to the grinding gap occurred with the special one The location of the sealing strips on the rollers was not taken into account, nor was it intended.

Roller mills have also been connected to suction devices, but that was the case the suction of the ground material that has passed through the rollers on the exit side of the grinding gap, while this is the suction of the on the inlet side in the direction of the grinding gap by surface friction entrained air after being intercepted and deflected by the scrapers.

The wipers according to the invention also need, in contrast to the known sealing members not to lie close to the roller surfaces, but can stand opposite them at a small distance, because then they practically serve their purpose.

The drawing illustrates the invention using two exemplary embodiments.
Fig. 1 is a cross section through a roller mill designed according to the invention,

2 shows a similar representation of another embodiment.

According to FIG. 1, the roller frame has two pairs of rollers a, b, which rotate in opposite directions at different circumferential speeds and at the inlet angle of which the grist is fed through feed rollers c, d and a guide plate e arranged below them. One shaped like a scratch

80i 789/38

Claims (4)

Deflector / extends over the entire length of each roller a, b in the vicinity of the contact point of the rollers, the hook-shaped end g of each deflector coming up to the associated roller surface or in its vicinity at a point which is 15 to 40 ° in the direction of rotation lies in front of the point of contact. The hook-shaped end of each deflector catches the layer of air carried along on the roller surface and deflects it away from the roller so that it does not hit the ground material going to the point of contact. In the embodiment according to FIG. 2, each deflector g has a rolled-up part h into which the captured air is directed and to which a suction pipe i is connected at one or both ends of the deflector, through which the air is sucked off and to any desired point is directed. One can arrange a deflector in connection with only one roller of a pair, preferably with the faster running one. Patent claims: 1. Roller mill for grinding cereal products with one formed by a pair of rollers Grinding gap to which the ground material is fed in free fall or by means of feed rollers and at the scrapers cooperating with the surface of the rolls are provided, which extend over the entire length of the roll, characterized in that the scrapers (/) are arranged on the inlet side of the grinding gap and in its vicinity and the scraper with the surface of the rolls (a, b ) cooperating part (g) of the scraper, seen in cross section, is hook-shaped and has its end opposite to the direction of rotation of the rollers. 2. Roller mill according to claim 1, characterized in that a scraper (/) only on the fast running roller is provided. 3. Roller mill according to claim 1 or 2, characterized in that the cooperating with the roller surface, hook-shaped part (g) of the Abstreifears (/) is arranged 15 to 40 ° in front of the grinding gap. 4. Roller mill according to claim 3, characterized in that each scraper is provided with a suction line (h, i) or suction device for the captured air. Considered publications:
German Patent No. 935 524;
Swiss patent specification No. 5747. 1 sheet of drawings ® 80 »789/38 3.59