DRIVE ASSEMBLY FOR A ROLL CRUSHER

Abstract

A drive arrangement for a roll crusher includes two rollers arranged in parallel, two trains, each for driving a roller. The two drive trains each has a gear transmission including a drive shaft which can connect to a motor and an output shaft which can connect with a roller. Each gear transmission includes an intermediate shaft arranged between the drive shaft and the output shaft. The intermediate shafts are connected to each other via a slip-free torque transmission device which allows an offset of the gear transmissions in relation to each other in combination with a torque limiting clutch which terminates the connection for a conjoint rotation of the intermediate shafts when an adjustable torque is exceeded.

Claims

1-7. (canceled)

8. A drive assembly for a roll crusher, comprising: two rollers arranged in parallel; two drive trains configured to drive the rollers in one-to-one correspondence, each said drive train including a gear transmission which comprises a drive shaft configured for connection to a motor, an output shaft configured for connection to a corresponding one of the rollers, and an intermediate shaft arranged between the drive shaft and the output shaft; slip-free torque transmission devices configured to allow an offset of the gear transmissions relative to each other; and an overload clutch, said intermediate shaft of one of the drive trains and said intermediate shaft of the other one of the drive trains being connected to each other via the slip-free torque transmission devices and the overload clutch, with the overload clutch terminating a connection for conjoint rotation of the intermediate shafts when an adjustable torque is exceeded.

9. The drive assembly of claim 8, wherein each torque transmission device includes two synchronizing bevel gears, each of said bevel gears including an input shaft connected to a corresponding one of the intermediate shafts for conjoint rotation, and an output shaft, and further comprising a shaft connection connecting the output of one of the bevel gears with the output shaft of the other one of the bevel gears and configured to allow an offset of the output shafts of the bevel gears.

10. The drive assembly of claim 9, wherein the shaft connection includes an articulated shaft and/or a compensating clutch.

11. The drive assembly of claim 8, wherein each of the torque transmission devices includes a chain or a toothed belt for connecting the intermediate shafts to each other.

12. The drive assembly of claim 8, further comprising gear wheels respectively arranged on the drive shafts and the intermediate shafts and meshing directly with each other.

13. The drive assembly of claim 8, wherein each of the gear transmissions includes at least one drive train spur gear stage and/or drive train bevel gear stage and/or drive train planetary gear stage.

14. A method for synchronizing a roller rotation of a roll crusher with two rollers arranged in parallel and a drive assembly including two drive trains configured to drive the rollers in one-to-one correspondence, each said drive train including a gear transmission which comprises a drive shaft configured for connection to a motor, an output shaft configured for connection to a corresponding one of the rollers, and an intermediate shaft arranged between the drive shaft and the output shaft, said method comprising: releasing a connection for conjoint rotation between the intermediate shaft of one of the drive trains and the intermediate shaft of the other one of the drive trains; rotating at least one of the intermediate shafts until a defined angular position of the rollers is achieved; and restoring the connection for conjoint rotation between the intermediate shafts.

Description

[0023] The invention is described in the following with reference to several exemplary embodiments and the attached drawing. The figures, which are in each case schematic and not true to scale, show in:

[0024] FIG. 1 a transmission scheme of a drive assembly according to the invention;

[0025] FIG. 2 a side view of a roll crusher with a drive assembly according to the invention;

[0026] FIG. 3 a top view of the roll crusher shown in FIG. 2;

[0027] FIG. 4 a detail view of an articulated shaft and an overload clutch; and

[0028] FIG. 5 a top view of shaft synchronization by means of a chain transmission or a synchronous belt.

[0029] FIG. 1 shows a transmission scheme of a drive assembly according to the invention with a first drive train 1 and a second drive train 2. The first and the second drive train 1, 2 are mirror images of each other. The two drive trains 1, 2 give rise to inversely oriented torques which are mutually supported by a supporting element 70. Each of the two drive trains 1, 2 comprises a drive train bevel gear 17, 27 with a downstream planetary gear 15, 25. The drive train bevel gears 17, 27 each have a drive shaft 11, 21 that can be connected to a motor for conjoint rotation, for example an electric or hydraulic motor. A second gear wheel arranged on a first intermediate shaft 12, 22 meshes with a first gear wheel arranged on the drive shaft 11, 21. Instead of the bevel gear stage of the drive shaft 11, 21 shown in FIG. 1, it is also possible for a spur gear stage to be present. The rotation is transmitted via further intermediate shafts, in the present case a second and a third intermediate shaft 13, 14 or 23, 24, into a planetary gear 15, 25 comprising a sun wheel, a hollow wheel and at least one planetary wheel that meshes with the sun wheel and the hollow wheel mounted in a rotatable planetary wheel support, which in each case comprises an output shaft 16, 26. In the present exemplary embodiment, the output shafts 16, 26 are formed by the planetary wheel supports of the planetary gear 15, 25. The output shafts 16, 26 can be connected to the crusher rollers of the roll crusher for conjoint rotation.

[0030] The first intermediate shafts 12, 22 are each connected to the input shafts 31, 41 of synchronizing bevel gears 37, 47 for conjoint rotation. The two output shafts 32, 42 of the synchronizing bevel gears 37, 47 are connected to each other for conjoint rotation via an articulated shaft 50 comprising two joints 51, 52 and an overload clutch 60.

[0031] The coupling of the first intermediate shafts 12, 22 of the gear transmission by means of the synchronizing bevel gears 37, 47 and the articulated shaft 50 causes the two drive trains to have the same speed.

[0032] FIG. 2 is a side view of a roll crusher with a drive assembly according to the invention. The drive assembly comprises two drive trains 1, 2 giving rise to counter rotations of the rollers of the roll crusher. The first drive train 1 comprises a bevel gear 17 and a downstream single-stage planetary gear 15. The drive shaft 11 of the first drive train 1 is coupled via a coupling 101 to a drive motor 102 arranged on a motor swing base 103. The second drive train 2 has a similar design: this also has a bevel gear 27 and a downstream single-stage planetary gear 25. The drive shaft 21 of the second drive train 2 is coupled via a coupling 201 to a drive motor 202 arranged on a motor swing base 203. In each case, a first intermediate shaft of the bevel gears 17, 27 is connected to an input shaft of synchronizing bevel gears 37, 47. For torque support, in each case, a torque arm 104, 204 is arranged between the bevel gears 17, 27 of the drive train and the synchronizing bevel gears 37, 47. The two output shafts 32, 42 of the synchronizing bevel gears 37, 47 are connected to each other for conjoint rotation by an articulated shaft 50 comprising two joints 51, 52 and an overload clutch 60.

[0033] For torque support, in each case a torque arm 71, 72 is arranged between the planetary gears 15, 25.

[0034] FIG. 3 is a top view of the roll crusher shown in FIG. 2. In this case, the two torque arms 71, 72 between the planetary gears 15, 25 and the rollers 301, 302 of the roll crusher that are each connected to an output shaft 16, 26 of one of the two drive trains 1, 2 are clearly identifiable.

[0035] FIG. 4 is a detail view of an articulated shaft 50 and an overload clutch 60 connecting the output shafts of a first 37 and a second 47 synchronizing bevel gear to each other for conjoint rotation. The two joints 51, 52 of the articulated shaft 50 enable an offset that occurs during the operation of the roll crusher—radial and/or angular, to a certain degree also axial offset—of the output shafts 32, 42 of the synchronizing bevel gears 37, 47 to be compensated.

[0036] The overload clutch 60 is set such that it transmits the torque required for the synchronization of the two drive trains and is only released, for example by slipping, in the case of excessive torque, which could cause damage to the transmission.

[0037] FIG. 5 is a top view of shaft synchronization by means of a chain transmission or a synchronous belt. Each drive train for driving one of the two rollers of a roll crusher comprises a drive train bevel gear 17, 27. Mutually corresponding intermediate shafts 12, 22 of the drive train bevel gears 17, 27 extend beyond the transmission housing and each support a first and a second chain wheel 501, 502. In this case, the two chain wheels 501, 502 are connected to each other for conjoint rotation by means of a chain 503. In this case, the overload clutch 60 sits on one of the two intermediate shafts 12, 22, here: on the second intermediate shaft 22, and supports the second chain wheel 502. In this way, in the event of an overload, the second chain wheel 502 can slip on the second intermediate shaft 22. Unlike synchronization by means of bevel gears described in FIG. 1, the chain transmission synchronization dispenses with the diversion of the torque by 90 degrees by means of bevel gears; instead, the synchronization takes place immediately above the axially-parallel intermediate shafts 12, 22.

[0038] Instead of a chain gear, a similar synchronization of the two intermediate shafts 12, 22 can also take with place a synchronous belt, i.e. toothed belt pulleys and a toothed belt. In this optional embodiment, the reference numbers 501, 502 correspond to the toothed belt pulley and the reference number 503 to the toothed belt.