LEVER SYSTEM FOR FORCE TRANSMISSION

Abstract

The invention relates to a lever system for force transmission for a grinding roller.

A more cost-efficient, simplified lever system is to be created which no longer requires the integration into a mill stand but is more easily accessible for installation and maintenance works. For this purpose, provision is made in particular in that on the central rocking lever of the grinding roller an eccentrically arranged side lever is provided which has a lever arm extending in the opposite direction to the grinding roller and in that the force transmission onto rocking lever and grinding roller takes place via a lever arm of the side lever and a piston rod of the hydraulic cylinder.

Claims

1. A lever system for force transmission for a grinding roller, with a central rocking lever having a rocking lever axis that is supported on a bearing block, and with a hydraulic cylinder having a piston rod for the application of force to the rocking lever, on the central rocking lever an eccentrically and only on one side of the central rocking lever arranged side lever is provided, in that the side lever has a lever arm extending in the opposite direction to the grinding roller and in that a force coupling is provided between the lever arm of the side lever and the piston rod of the hydraulic cylinder.

2. The lever system according to claim 1, wherein: the hydraulic cylinder is arranged such that a substantially perpendicularly effective force coupling to the lever arm of the side lever can be achieved.

3. The lever system according to claim 1, wherein: the side lever is arranged in a manner that it can be uncoupled from and coupled to the central rocking lever.

4. The lever system according to claim 1, wherein: the bearing block of the rocking lever axis and the hydraulic cylinder are provided on a bearing pedestal, in particular on a stepped concrete pedestal.

5. The lever system according to claim 1, wherein: the hydraulic cylinder acts in a pressurized manner onto the side lever and the grinding roller.

6. The lever system according to claim 1, wherein: the rocking lever axis is supported by means of two different bearings and in that the bearing on the side of the side lever is designed larger than the bearing opposite thereto.

7. The lever system according to claim 1, wherein: to swing out the grinding roller a separate unit with hydraulic cylinder and piston rod can be arranged on the bearing pedestal in the free lateral region with respect to the side lever.

8. The lever system according to claim 1, wherein: the pump and accumulator unit required for the hydraulics can be arranged locally close to the hydraulic cylinder, in particular on the stepped concrete pedestal.

9. The lever system according to claim 1, wherein: the side lever is of approximately triangular shape or L-shape and its longer leg is force-coupled to the hydraulic cylinder and aligned approximately parallel to the roller axis.

10. The lever system according to claim 1, wherein in the end region of the shorter L-leg of the side lever a flange-like fastening to the central rocking lever is provided.

Description

[0027] The invention is explained in greater detail hereinafter by way of a schematic exemplary embodiment, wherein show:

[0028] FIG. 1 a perspective view of a lever system depicted from the outside in the direction of a grinding table of a roller mill, in which case only a single module of a grinding roller with lever system is shown;

[0029] FIG. 2 the example of the lever system according to FIG. 1 in a lateral perspective view, depicted, as it were, from the interior of a roller mill;

[0030] FIG. 3 a simplified sectional view along the line S-S according to FIG. 1 in the region of the respective rocking lever axis, depicted in the direction of the grinding table;

[0031] FIG. 4 the example according to FIG. 1 with installed hydraulic swing cylinder in a free region opposite the side lever;

[0032] FIG. 5 the example according to FIG. 4 with the grinding roller swung out into a vertical position;

[0033] FIG. 6 the example of a lever system according to prior art with a rocking lever fork and the arrangement of two hydraulic cylinders for actuation thereof, with accommodation within a mill stand, and

[0034] FIG. 7 the example according to FIG. 6 pursuant to the prior art in perspective view from the interior of the housing of a roller mill towards the outside.

[0035] In FIG. 1 a lever system 1 according to the invention is shown schematically in perspective view in the direction of a corresponding grinding table 4. A conical grinding roller 3 which in operation rolls in a force-locked and frictionally engaged manner on grinding material to be comminuted is guided with its roller axis 6 in a central rocking lever 10.

[0036] The central rocking lever 10 is arranged via a rocking lever axis 9 in a U-shaped bearing block 12 which, in the example, is fastened on a stepped concrete pedestal 25.

[0037] In the perspective side view on the lever system 1 according to FIG. 2 a side lever 11 located in the left lateral region of the central rocking lever 10 is on the one hand firmly attached via a flange-like fastening 14, in which case the side lever 11 is supported in the lower region on the rocking lever axis 9.

[0038] The side lever 11 which is of approximately triangular or L-shaped design faces with its longer leg of the L-shape in the opposite direction to the grinding roller 3 or rather its grinding roller axis 6. For the application of force to the side lever 11 provision is made in the end region of the lever arm 13 for a fastening eyelet 18, via which a piston rod 16 of a hydraulic cylinder 15 is in engagement with the side lever 11.

[0039] The hydraulic cylinder 15 is fastened by way of a base block 19 on the region of the pedestal 24 of the concrete block.

[0040] Furthermore, arranged at a short distance or locally close to the hydraulic cylinder 15 is an accumulator unit 17 which is connected via corresponding high-pressure hoses to the hydraulic cylinder 15 and its cylinder chambers. A pump unit assigned to the accumulator unit 17 is not illustrated in FIG. 1. Together with the hydraulic cylinder 15 to which a force can be applied on both sides the pump and accumulator unit 17 forms a hydropneumatic spring system for the grinding roller 3. On the other hand, the illustrated arrangement between the hydraulic cylinder 15, the piston rod 16 and the largely perpendicular arrangement to the lever arm 13 of the side lever 11 enables the functioning of the hydraulic cylinder 15 as a pressure cylinder so that through this the necessary hydraulic force to be applied to the grinding roller and the grinding material on the grinding table 4 can be ensured during the grinding operation.

[0041] Since the side lever 11 is attached eccentrically and only on one side of the central rocking lever 10 a free lateral region 27 remains on the other side, in which a hydraulic swing cylinder 30 can be arranged as illustrated in FIGS. 4 and 5.

[0042] In FIG. 3 a sectional view corresponding to the line S-S according to FIG. 1 is shown in a simplified and schematic manner. Due to the eccentric arrangement of the side lever 11 on the left side of the central rocking lever 10 the corresponding bearing 21, which preferably is a roller bearing, is of slightly larger design than the bearing 22 provided on the right side, wherein by means of both bearings 21, 22 the weight forces of the grinding roller 3, its roller axis 6 and of the central rocking lever 10, including those of the side lever 11, are transmitted onto the rocking lever axis 9 and subsequently into the bearing block 12.

[0043] In FIG. 4 a perspective side view on the lever system 1 according to FIG. 1 is illustrated, wherein in this Figure a hydraulic swing cylinder 30, starting from a base block 34 fastened on the concrete pedestal 25, reaches with its piston rod 31 up to a head block 33. This head block 33 engages in a rotative manner on a coupling plate 32 which is rigidly fixed on the central rocking lever 10.

[0044] Therefore, should it become necessary to swing the grinding roller 3 from the position shown in FIG. 4 into a largely vertical swung-out position, as shown in FIG. 5, in the example according to FIG. 4 an application of force to the hydraulic swing cylinder 30 is required such that the piston rod 31 is retracted into the cylinder. As a result of this movement process, as shown in FIG. 5, the grinding roller 3 is swung from its position (FIG. 4) inclined towards a grinding table 4 into a position swung out of the housing of a roller mill according to FIG. 5. This largely vertical swung-out position of the grinding roller 3 is in particular assumed for maintenance or repair purposes on the grinding roller 3 or the entire roller mill.

[0045] The concept according to the invention with the eccentric arrangement of the side lever 11 and the largely perpendicular force coupling of the hydraulic cylinder 15 with piston rod 16 enable on the one hand a relatively simple and reliable pressurization of the grinding roller 3.

[0046] On the other hand, opposite the side lever 11 a free lateral region 27 is created, in which a hydraulic swing cylinder 30 to swing out the grinding roller 3 can be arranged relatively easily and quickly, in which case the installation and dismantling of these structural components on the open concrete pedestal 25 can also be handled well because use is not made of the integration of the entire lever system into a largely closed mill stand, as it is conventionally the case.

[0047] Moreover, the abandoning of a hitherto employed rocking lever fork, specifically consisting of cast material, and, in lieu thereof, the utilization of a side lever, consisting of a steel plate where appropriate, leads to a significant cost reduction.