JP2726084B2 - Roller mill - Google Patents

Description

Description: The invention relates to a roller mill according to the preamble of claim 1.

Such roller mills are generally used to grind dyes, chocolate or other paste-liquid substances to be ground.
The individual rollers are designed as milling roller mills so that they are driven at different speeds. A very different type of scraper arrangement has been proposed for removing relatively liquid substances to be ground short of the roller surface, but this scraper ("doctor blade") usually consists of a roller on their carrier. It is adjustably fixed so that it can move toward the surface. Examples of such roller mills include, for example, U.S. Pat. Nos. 2,592,914, 2,818,013 and 2,893.
8,873 and also, for example, German Patent Publication No. 33
No. 9,482.

All these known structures are arranged such that the paste-liquid substance to be ground scraped from the rollers by the scraping device flows directly through the surface of the scraping device and is collected below it. . That is, this structure requires a corresponding space for installing the collecting container. If, on the other hand, the paste-liquid material to be ground is to be transported elsewhere, it is not possible with these known structures, or it is possible to move it appropriately and beneath the scraping device. This can only be done with the container provided.

German Offenlegungsschrift 35 26 260 has already proposed a scraping device in which the scraped paste-liquid substance to be crushed can be sucked and conveyed to any desired position via a hose or a conduit. ing. Of course, in this case, a large amount of equipment cost for the suction pump and the expense of energy consumption are assumed.

The problem underlying the present invention is, on the one hand, to ensure the advantages of the last-mentioned configuration and at the same time reduce costs.

The object is achieved according to the invention by the features of claim 1. In this connection, it will be described below on the basis of the figures that the efficiency of the roller mill according to the invention is surprisingly increased.

Of course, the housing can be formed in any shape and size, so that the discharge opening can be mounted where a suitable collecting container can be provided below it.

Another excellent feature of the roller mill according to the invention is claim 2
It is described in.

The present invention will be described in detail with reference to the embodiments illustrated in the accompanying drawings.

FIG. 1 shows three rollers 1 of a three roller roller mill,
A few are illustrated by way of example. Of course, the claimed scraper structure described below is not bound by the number of rollers as long as at least two rollers are provided. Generally, roller 1 is a supply roller, whereas roller 3 is a discharge roller. As in a conventional attrition roller mill, the rollers 1, 2, 3 rotate at an increasing speed as their number increases, and therefore these press against each other by means of a device, not shown, known per se. Grinding takes place between the rollers 1, 2, 3 each time, the roller 2 pulling the liquid film from the roller 1 and the roller 3 pulling the liquid film from the roller 2.

A scraping device 4 belonging to the discharge roller 3 is provided above the discharge roller 3, and another scraping device 5 is provided on the roller 2 adjacent to the roller 3 so as to be opposed to the roller 3. I have. In the embodiment shown schematically in FIG. 1, these two scraping devices 4, 5 are joined together to form an airspace S and at the same time are directed parallel to the axes 1a, 2a and 3a. Side wall of a housing 6 which is provided with an end wall 7 and at least one covering wall 8 on both sides.
It has.

The housing 6 is held above the rollers 2, 3 in a manner not shown. As can be seen from the drawing, the curved covering wall 8 is connected via a curved edge 9 to the scraping devices 4,5. However, this configuration is only shown schematically. Because the scrapers 4,5
This is because it is known that wear occurs while the rollers 1, 2, and 3 are being driven and must be adjusted frequently. The adjustment is then carried out in such a way that a pivoting movement is effected in the direction of the corresponding roller 2 and 3 in accordance with the arrow A and / or in the direction of the arrow B the sliding devices 4 and 5 are slid. It can be done by doing. Both movements A and B are effected on the one hand by movably mounting the housing 6 on its carrier (not shown) in a correspondingly movable manner. In this case, the movable hose connection is provided with a discharge opening 11 provided in the housing 6.
Is connected to a conduit 12 via a hose 10. This conduit 12 then opens into a known collecting vessel 13.

However, the housing 6 is likewise fixedly mounted, and in the area of the curved edge 9 a suitable adjusting device, known per se, is provided, by means of which the movement of the scrapers 4, 5 is indicated by arrows A and / or
Or it is also possible to move in the direction of B. Many such arrangements are known and will not be described in detail. In one case, the walls 4, 5, 7, 8 are firmly connected to one another in the first-mentioned case, i.e. when the housing 6 is movably mounted for adjustment purposes, in order to ensure that the housing is airtight. Have been. However, the degree of wear of the scrapers 4, 5 and the rollers 2, 3 belonging to them can be different, so that the adjustable bearings of the housing 6 can be relatively complicated. . Therefore, the housing 6 is provided immovably,
Advantageously, the scraping devices 4, 5 (possibly even multi-piece devices) are mounted movably relative to the housing for adjustment purposes. For example, it is advantageous to form the curved edges 9 elastically, so that the scraping devices 4, 5 provided on these curved edges are always adapted to the roller surfaces of the rollers 2, 3. Needless to say, in this case, the side surfaces of the scraping devices 4 and 5 are each provided with a gap with respect to the end wall 7.

On the other hand, the hose connection 10 may be omitted and the immobile conduit 12 may lead to the discharge opening 11, which is provided with a flange connection tube 14. In this case, the connecting flange 16 serves as a detachable coupling device in a known manner, which permits an easy disassembly, for example for the purpose of adjustment, and, if desired, another disengageable connection (screw connection, fast-acting). It is also possible to replace with a bond. Of course, it is desirable to connect the movable conduit to the connecting tube 14 and thereby use a hose over the entire length of the conduit 12.

The actual construction of such a housing construction and a scraper construction can be seen from FIG. FIG. 2 shows only the last two rollers 2, 3 of the roller mill. In this case, parts having the same functions are denoted by the same reference numerals as those in FIG. 1, but the reference numerals of the parts having similar functions are shown in the order of 100s.

In order to improve the pressure tightness and ensure the independent adjustability of the scraping devices 4, 5, the pressure tight housing 106 shown in FIG.
Advantageously, it encloses the scrapers 4, 5 with 04, 105. In this case, the scraping devices 4, 5 are fixed to these housing side walls 104, 105 by carrying devices 109, which are shown schematically, in which case these carrying devices can be provided with all known adjusting devices. is there. In the simplest case, these carrier devices 109 are formed from elastic blocks, for example blocks made of rubber, which exert a force in the direction of arrow A on the scrapers 4, 5,
These scrapers are always kept in contact with the surfaces of the rollers 2 and 3 to which they belong. Further, a scraping device 4,
5 is provided with long holes, and these long holes are scraped by the scraper 4,
A fixing bolt for fixing 5 to the carrier 109 is penetrated, which allows adjustment in the direction of arrow B.

To ensure the pressure tightness of the housing 106, the side walls 104,
105 has a tongue-shaped packing 15. However, such tongue-shaped packings are provided in the area of the scrapers 4, 5 on the side walls of these scrapers, so that on one hand the sealing against the end wall 7 and on the other hand, if necessary, the covering. Advantageously, a seal against the wall 8 is also ensured.

When the apparatus according to FIGS. 1 and 2 is activated, the discharge roller 3 and the roller 2 adjacent to this discharge roller push the liquid substance in the direction of the rotational arrow shown into the respective housings 6 and 106. send. The rollers 2, 3 are operated in the manner of a gear pump--the invention is based on this recognition--operating, delivering the paste--liquid material to be ground from the last grinding roller gap, with the paste--liquid It allows a build-up of pressure sufficient for the material to be ground to pass through conduit 12 through discharge opening 11. Further following this step, a siphon action occurs after the paste-liquid to-be-ground substance has flowed through conduit 12. That is, after the liquid has flowed into the collecting vessel 13, additional suction takes place which, together with the pressure exerted by the rollers 2, 3, discharges the paste-liquid substance to be ground. Therefore, it does not require any additional pump or similar equipment that is always needed. Other advantages are
In such a process, only the finished portion of the material to be ground can be constantly extracted from the gap between the discharge roller 3 and the roller 2 belonging to the discharge roller. This is because the other parts remain adhered to the surface of the roller 2 and are fed back to the roller 1 at the bottom-because of the excess of liquid material to be ground. However, this means that the device according to the invention avoids the extra grinding operation of the rollers 1, 2, 3 and thus increases the processing efficiency of the roller mill in a simple manner.

Many different variants of the illustrated embodiment are possible within the framework of the invention. That is, it is possible to provide a number of discharge openings instead of a single discharge opening 11. Furthermore, the provision of a carrier device 109 on the side walls 104 and 105-which is advantageous-is not necessary. Similarly, it is also possible to couple the carrier device 109 with the covering wall 8 for each of the scraping devices 104 and 105 or only for at least one.

Furthermore, the end walls 7 of the pressure-tight housing 6, 106 are constructed in the manner of a known sealing wedge, and all of the conventional constructions for such wedges are used for this end wall. Of course it is possible.

[Brief description of the drawings]

FIGS. 1 and 2 each show an embodiment of a roller mill according to the present invention, in which the roller mill is shown in a cross section along the roller axis, and the roller is reduced in comparison with the rest. 1, 2, 3,... Rollers, 4, 5, 104, 105... Scraping device, 6, 106... Housing, 11.
...... Carrier, 15 ... Tongue packing.

Claims (7)

(57) [Claims] 1. At least two, in particular at least three rollers pressed against each other by a pressing device,
In a roller mill for paste-liquid crushed substances in a manner in which the crushed substances are supplied to these rollers and are removed from their discharge rollers by a scraper, a roller (3) adjacent to the discharge roller (3) In 2), a scraping device (5) is provided at the same position as the scraping device (4) of the discharge roller (3). Both scraping devices (4, 5) are pressure-tight and common. Connected to a housing (6; 106) which surrounds an air space (S) formed between the scrapers (4, 5) and in which paste-liquid The material to be comminuted is adapted to be introduced via rollers (2, 3) adjacent to one another under a feed pressure, and the pressure-tight housing (6; 106) has at least one discharge opening. (11) A roller mill for the paste-liquid substance to be ground, characterized in that: 2. A hose or conduit (10; 12) which is a discharge opening (11) of the pressure-tight housing (6; 106), suitably a connecting pipe and a releasable coupling device (16) provided in the connecting pipe. The roller mill according to claim 1, wherein the roller mill is connected to the mill. 3. A pressure-tight housing (106) surrounds the scrapers (4, 5) by housing side walls (104, 105), and the scrapers (4, 5) are mounted on the housing (106). 3. The roller mill as claimed in claim 1, wherein the roller mill is fixed to an adjustable carrier (109) provided in a manner known per se. 4. The roller mill according to claim 3, wherein at least one of the carrier devices (109) is fixed to the housing side wall (104; 105). 5. A scraper (4; 5) comprising a housing (6; 106).
At least one and at least one elastic member (9;
Roller mill according to claim 3 or 4, wherein the roller mill is connected via (109). 6. Roller mill according to claim 3, wherein the pressure-tight housing (6; 106) is fixedly provided. 7. The method as claimed in claim 1, wherein at least one tongue-shaped packing (15) is provided in each of the scrapers (4, 5) for sealing the pressure-tight housing (6; 106). 6
The roller mill according to any one of the above.