GRINDING-ROLLER APPARATUS

Abstract

The invention relates to a grinding roller device for a roller mill having a sleeve-like mount for securing the spindle of the grinding roller, wherein the grinding roller is rotatively mounted in axial direction in a stationary way at the end region of the spindle, and wherein the sleeve-like mount features at least one clamping means in order to secure the spindle in the mount against rotation and axial movement. The invention is characterized in that the sleeve-like mount features an inner eccentric sleeve to provide for adjustability of the spindle of the grinding roller, and in that the eccentric sleeve is arranged in the sleeve-like mount to provide at least rotary adjustment of the spindle, and/or in that the eccentric sleeve is displaceably accommodated in the sleeve-like mount to provide axial displacement in axial direction of the spindle of the grinding roller.

Claims

1.-12. (canceled)

13. A grinding roller device for a roller mill comprising: a sleeve-like mount for securing a spindle of the grinding roller, wherein the grinding roller is rotatively mounted in axial direction of the spindle in a fixed way at an end region of the spindle, and wherein at least one clamping means is provided in the sleeve-like mount to rotationally secure and axially secure the spindle, wherein: the sleeve-like mount comprises an inner eccentric sleeve to provide for adjustability of the spindle of the grinding roller, and one or more of the following: by rotation of the inner eccentric sleeve, the longitudinal axis of the spindle is variable within the sleeve-like mount, and the eccentric sleeve is displaceably accommodated in the sleeve-like mount to provide axial displacement of the spindle of the grinding roller in the direction of the spindle.

14. The grinding roller device according to claim 13, wherein the eccentric sleeve has an eccentric wall thickness across an angular area of the sleeve wall measuring less than 180.

15. The grinding roller device according to claim 14, wherein the angular area of the sleeve wall is within a range of 90 to 120.

16. The grinding roller device according to claim 13, wherein the eccentric wall thickness of the sleeve is provided in a 90 area of the spindle, and is provided to be rotatable at least in the spindle in the direction of the 0 area or a 180 area.

17. The grinding roller device according to claim 13, wherein a vertical section of the eccentric sleeve in normal operation features wall thicknesses in the 0 area and the 180 area which are designed to be equal in strength.

18. The grinding roller device according to claim 13, wherein for the purpose of axial displacement of the spindle of the grinding roller, the sleeve-like mount has axially displaceable engagement with the eccentric sleeve.

19. The grinding roller device according to claim 13, wherein for the purpose of rotary adjustment of the spindle, the end side of the inner eccentric sleeve opposite the grinding roller has an adjusting means comprising a sector gear region on an annular flange of the eccentric sleeve which is rotatively actuable using an adjusting pinion.

20. The grinding roller device according to claim 19, wherein: the outer circumference of the eccentric sleeve comprises an annular region comprising two circumferential rings which are adapted in a radial direction to the eccentric wall thickness of the eccentric sleeve, and a positively locking engagement area is formed between the rings for the axially displaceable engagement.

21. The grinding roller device according to claim 20, wherein: the axially displaceable engagement comprises an engaging element that is externally actuable with the engaging area of the rings by means of an actuating element, and the engaging element is arranged eccentrically to the longitudinal axis of the actuating element configured as a rotary actuating element.

22. The grinding roller device according to claim 13, wherein the central longitudinal axis of the eccentric sleeve in the normal position of the grinding roller is offset in the direction of the eccentric wall thickness of the eccentric sleeve with respect to the central longitudinal axis of the spindle of the grinding roller.

23. The grinding roller device according to claim 13, wherein: the roller mill has a cylindrical, ball-shaped or frustoconical outer contour of the grinding roller, and the sleeve-like mount forms a lever for the spindle and the grinding roller which is rigidly fixed by a fork at a top side of an actuable swing lever, and said swing lever is pivotable around the swing lever axis thereof.

24. The grinding roller device according to claim 13, wherein: the roller mill has a rotatable grinding table, and at least one grinding roller rolling upon in frictional engagement with the mill feed being comminuted, and the radial distance between the grinding roller and the edge area of the grinding table and/or the distance between the rolling surface of the grinding roller and the grinding table is adjustable by means of the adjustability of the eccentric sleeve.

Description

[0045] The invention will be illustratively and schematically explained in even greater detail hereinafter with the aid of a number of drawings. Being shown are:

[0046] FIG. 1 a schematic side view of a grinding roller device and how it can be mounted in a fork of a swing lever in a roller mill and operably arranged with respect to a grinding table of a corresponding roller mill;

[0047] FIG. 2 a rear view of the example according to FIG. 1 with the significant assemblies used for rotary adjustability of the spindle and, therefore, vertical adjustability of the grinding roller;

[0048] FIG. 3 a partly vertical section of a comparable example of a further grinding roller device having a downward-projecting swing lever and the swing lever axis thereof along with a central longitudinal axis for the spindle and the grinding roller;

[0049] FIG. 4 a section along the line B-B according to FIG. 3, which will be referred to as a horizontal section, with the eccentric sleeve arranged in its normal position and the maximum eccentric wall thickness in a 90 area (downwards in FIG. 4), with the slight offset of the central longitudinal axis of the eccentric sleeve and the grinding roller being indicated.

[0050] FIG. 5 a side view of a grinding roller device similar to that shown in FIG. 1, and

[0051] FIG. 6 a schematic section along the line E-E through the corresponding lever according to FIG. 5 along with the schematic arrangement of the corresponding assemblies used for axial adjustability of the spindle and the grinding roller.

[0052] The drawings in this application relate to slightly revised exemplarity embodiments of the grinding roller device, in which context their arrangement and their connection to further assemblies of a roller mill is also schematically depicted.

[0053] Use of the same reference signs relates to the same assemblies, although small deviations in the assemblies may exist. In addition, the views and sections of the grinding roller device shown in the drawings will be brought into a relationship with one another even though various scales are being shown.

[0054] FIG. 1 shows a side view of the schematic arrangement of a grinding roller device 1 with respect to the rigid securing thereof in the fork side members 12 of a fork 8 of a swing lever 7 (FIG. 3), with the working position of a grinding roller 2 being illustrated with respect to a grinding table 11 of a roller mill at the same time.

[0055] The left side of the grinding roller device 1 features a sleeve-like lever 4, which is rigidly secured via a securing means 28 at the end region of the fork side members 12 of the fork 8. The interior of lever 4 accommodates an eccentric sleeve 10 (FIGS. 3 and 4). The spindle 5 of the grinding roller device 1 is secured in this eccentric sleeve 10 against rotation and axial movement by way of a clamping means 19 (FIG. 3).

[0056] As a result, the spindle 5 is at least frictionally accommodated in the eccentric sleeve 10 and secured such that rotation of or slight axial displacement of the spindle 5 is only able to take place by means of a corresponding operation for moving the eccentric sleeve 10.

[0057] The grinding roller 2 in the example according to FIG. 1 is equipped with a frustoconical or rather a conical roller shell 3 (FIG. 3). By virtue of this configuration, the longitudinal axis of the grinding roller device 1 is inclined in the direction of the horizontally-oriented grinding table 11 by an angle of, for example, 10 to 30.

[0058] Insofar as the grinding roller device 1 were to feature a cylindrical grinding roller instead of a conical grinding roller 2, the longitudinal central axis of the grinding roller device would in principle be horizontal and would not be inclined in the direction of the grinding table. The arrangement could also take place in a similar fashion using a ball-shaped grinding roller.

[0059] FIG. 2 illustrates the embodiment shown in FIG. 1 and the significant assemblies thereof, using a schematic view of the rear in the direction of the arrow R. In one respect, the lever 4 is secured via the securing means 28 in the fork side members 12 of the fork 8 (FIG. 3). In a second respect, the view of the rear of the grinding roller device 1 shows an annular flange 21 for the eccentric sleeve 10. Illustrated radially inward is a requisite clamping ring 22, in which context the rear closure of the sleeve 4 can be realized using a bayonet closure 23.

[0060] As shown in FIG. 2, an adjusting means 24 is present, which essentially consists of a sector gear 25 of the annular flange 21. In the example, said sector gear 25, which is provided across an angular range of approximately 90 to 120, is in tooth-type rotary engagement with an adjusting pinion 26 having a significantly smaller radius.

[0061] FIG. 2, which is a view in the direction of the longitudinal axis 14 (FIG. 4), indicates angular values of 0, 90, and 180 for the spindle 5 (FIG. 3) and the roller 2 (FIG. 4). Reference thereto will still be made hereinafter with respect to the eccentric wall thickness of the sleeve 10.

[0062] In FIG. 3, a schematic vertical section through the grinding roller device 1 illustrates the internal structure and the arrangement of the spindle 5 with the eccentric sleeve 10 within the lever 4. The section along the line B-B (FIG. 3), which is illustrated in FIG. 4, is included at the same time for reference in order to clarify the eccentric sleeve 10.

[0063] As shown in FIG. 3, the sleeve 4 is rigidly connected to the upper ends of the fork side members 12 of the fork 8 via the securing means 28 (FIG. 1). During operation of a roller mill equipped with a grinding roller device 1 of this kind, the requisite grinding force is applied to the rolling surface 52 of the grinding roller 2 via a swing lever 7 which is pivotable around its swing lever axis 9 and which, in the example, relates to the combination of the fork 8, the fork side members 12, and the lever 4 as well as the grinding roller device 1 attached thereto, in which context opposing forces from the mill feed being comminuted may act on the swing lever 7.

[0064] The eccentric sleeve 10 is at least rotatably accommodated in the interior of the lever 4 via an angular range as well as being accommodated in an axially displaceable manner. Via the clamping means 19, the eccentric sleeve 10 itself is rigidly connected against rotation and axial movement to the spindle 5 of the grinding roller device 1.

[0065] The section shown in FIG. 3 shows, in principle, the normal position of the grinding roller device 1, whereby the roller milling gap 39 (FIG. 1) between the grinding roller 2 and the grinding table 11 is adjusted to a distance A at the beginning of operation.

[0066] Given that wear of the rolling surface 52 of the roller shell 3 occurs during the process of comminuting the relevant materials such as clinker, and that abrasion of the substance of the roller material results thereby, the outcome is an undesirable enlargement of the distance A of the milling gap 39. Previously, this problem was remedied by welding material onto the roller or by appropriately armoring the rolling surface 52.

[0067] However, this measure required downtime for the roller mill, which led to cooling of the roller mill, in order for the measures to be carried out directly in the milling space.

[0068] According to the invention, altering the distance A of the milling gap 39 can now be carried out from outside the roller mill housing, without having to affect the sealing of the roller mill housing. The largely gastight seal between the grinding roller device 1 and the roller mill housing itself is provided in the approximate area of the circumferential annular orifice 49 (FIG. 3) such that adjustment of the grinding roller 2 is able to be carried out in a nearly vertical or in a nearly horizontal, i.e. axial, direction from outside of the roller mill housing.

[0069] While FIG. 3 shows a section of the arrangement of the grinding roller along the line from 0 to 180 (FIG. 2), the section according to FIG. 4 shows the internal arrangement of the eccentric sleeve 10 within the lever 4 in the 90 area (FIG. 2).

[0070] In the illustration shown in FIG. 3, the eccentric sleeve 10 features wall thicknesses 38 which are largely equal both in the upper area (0 area) and in the lower area (180 area). The outer circumference of the sleeve 10 has two axially spaced rings 34, between which a groove-like engagement area 32 is formed.

[0071] The schematic illustration shown in FIG. 4 of the grinding roller device 1 shown in FIG. 3 shows the eccentric sleeve 10 with the wall thickness 36 thereof in the 90 area (FIG. 2). In the lower area shown in FIG. 4, which corresponds to the eccentric thickening of the wall region, two rings 31 radially protruding are provided from the sleeve 10, with an engagement area 2 being provided between them.

[0072] In addition, by virtue of the greater wall thickness 36 in the lower area (90 area) of the eccentric sleeve 10, the longitudinal axis 15 of the sleeve 10 is offset (16) with respect to the longitudinal axis 14 of the spindle 5 and the grinding roller 2.

[0073] Insofar as wear on the roller shell 3 makes it necessary to readjust the grinding roller 2 in order to optimize the distance A of the milling gap 39, the adjusting means 24 (FIG. 2) can then be actuated according to the invention in order to return the increased distance A of the milling gap 39 to the normal distance desired. As shown in FIGS. 2 and 4, the eccentric sleeve 10 having the increased wall thickness 36 in the 90 area is for this purpose turned upwards in a rotary manner (FIG. 2) until approximately the 0 area.

[0074] A nearly vertical downward displacement of the grinding roller 2 and the rolling surface 52 thereof is accomplished in this manner such that the milling gap 39 is able to be adjusted to its normal distance even following heavy material abrasion.

[0075] Although the eccentric sleeve 10 is turned together with the spindle 5 in a rotary manner via the adjusting means 24, which features an actuating means 29 (FIG. 1), the result is a nearly vertical displacement of the grinding roller 2.

[0076] FIG. 5 shows a grinding roller device 1 having a design similar to that shown in FIG. 1.

[0077] The lever 4 in this case is rigidly connected to the fork side members 12 of the fork 8 and the swing lever thereof via the securing means 28. At the level of the section line E-E, which also corresponds to the longitudinal axis 15 of the eccentric sleeve 10, an axial displacing means 46 is present along with an adjustment tool 43 as indicated.

[0078] The schematic section shown in FIG. 6 along the line E-E shown in FIG. 5 is illustrated with respect to the lever 4 and the eccentric sleeve 10 only as a partial section and essentially symmetrical to the longitudinal axis 15.

[0079] The sleeve 10 in this case is accommodated to be rotatively and axially adjustable within the lever 4 using two spaced circumferential rings 31 with a groove formed between them acting as an engagement area 32. In this context, the sleeve 10 is rigidly connected to the spindle 5 via a clamping means. A circumferential outer recess 47, which simplifies the axial relocatability of the sleeve 10, is provided on both sides of each of the rings 31.

[0080] In the example shown in FIG. 6, the axial adjusting means 46 features an adjustment cylinder 41, eccentric to the longitudinal axis 44 of which is an engaging pin 42, which projects into the groove of the engagement area 32.

[0081] By means of an outwardly attached adjustment tool 43, for example, it is possible via rotary movement of the adjustment tool 43 to actuate the eccentrically arranged engaging pin 42, thus accomplishing axial displacement of the eccentric sleeve 10.

[0082] The corresponding axial displacement distance can in this case be relatively small, for example in the range of up to 10 cm. By virtue of this axial displacement of the eccentric sleeve 10, the spindle 5 and the grinding roller 2 rotatably arranged at the end thereof are also axially displaced. As a result, the grinding roller 2 as shown in FIG. 1 can in this manner be displaced toward the right of the grinding table 11, thus being displaced further inward in a radial direction. Displacement in the opposite direction is of course also possible.

[0083] Consequently, the grinding roller device according to the invention makes it possible for the grinding roller to be adjustable in a nearly vertical and in a nearly axial direction from outside of the housing of a corresponding roller mill, thereby allowing the repair periods used for remedying the wear of material from the roller shell to be relatively short as well as accomplishing optimal adjustment with a view to both a normal milling gap and to the radial placement of the grinding roller with respect to the grinding table.