HK1124649B - Heavy duty gearbox for roller-and-bowl mills - Google Patents

Description

Heavy speed reducer of roller type disc mill

Technical Field

The present invention relates to a heavy duty decelerator for driving a roller disc mill.

Background

For the drive of roller mills with grinding disks rotating about a vertical axis, heavy-duty reducers are used which convert the rotational movement provided by a horizontally arranged drive motor into a vertical, slow rotation. For this purpose, an electric motor is often used as the drive motor, the rotational speed of which must be reduced to a ratio of 40: 1.

Such a reduction gear must provide a large power transmission at low rotational speeds, and a bevel gear stage is used for the rotation of the drive shaft, which bevel gear stage already produces a first reduction ratio of the rotational speed. The rotational speed is then further reduced in the vertical direction by a reduction stage, for example in the form of an epicyclic gear or a planetary gear.

For example, a heavy-duty reduction gear for driving a vertical grinding disk is known from CH 694244. In this case, the bevel gear stage with the horizontal drive shaft is vertically connected to a multi-stage epicyclic gear, which finally drives the grinding disks. The epicyclic gear mechanism is designed as a multi-stage planetary gear mechanism with power split, in which the power output which is added up in the internal gear toothing of the internal gear part of the planetary gear mechanism is achieved.

Disclosure of Invention

The object of the invention is to provide a heavy-duty retarder of this type which, while having a compact construction, permits simple assembly.

To this end, the invention provides a heavy-duty reduction gear for driving a roller mill, comprising a bevel gear stage having a horizontal drive shaft and a vertical driven shaft and a multistage epicyclic gear train which is connected to the driven shaft via a central pinion and can be connected to the grinding disks of the roller mill via an output flange, characterized in that first planet gears which engage in mesh with the central pinion in a first plane are arranged on a planet gear carrier which is connected to the output flange, and in that second planet gears are arranged in a second plane, the shafts of which second planet gears are connected to the reduction gear housing and which engage in one hand a first internal gear which is connected to the planet gear carrier or is formed on the planet gear carrier and in the other hand a central pinion of an intermediate gear, the intermediate gear also has a second internal gear which engages with the first planetary gear of the first plane from the outside.

The invention relates to a heavy-duty reduction gear for driving a roller disc mill, comprising a bevel gear stage having a horizontal drive shaft and a vertical driven shaft, and a multistage epicyclic gear train connected to the driven shaft via a central pinion, which can be connected to the grinding disc of the roller disc mill via an output flange.

According to the invention, the planet gears, which engage in a first plane with the central pinion, are arranged on a planet gear carrier, which is connected to the output flange. In addition, further planet gears are arranged in a second plane, the rotational axes of which are connected to the gear housing and which engage, on the one hand, an internal gear connected to the planet gear carrier and, on the other hand, a central pinion of an intermediate gear, which also has an internal gear, which engages in mesh with the planet gears of the first plane from the outside.

This provides a very compact reduction gear with power split, in which the power is transmitted directly to the output flange via the planet gear carrier via the shaft of the planet gear on the one hand, and via an internal gear connected to the planet gear carrier via another planet gear stage on the other hand. The mechanical design of the retarder also advantageously allows simple installation and construction of the retarder in the retarder housing, since the individual components of the retarder can be easily mounted from above in the positions set for it. Subsequent maintenance, repair and repair work on the individual components of the retarder is thereby also facilitated, since in some cases it is not necessary to disassemble and assemble the entire epicyclic gear train in one piece. Furthermore, due to the compact structure of the reducer of the present invention, the parts have small dimensions, so they can be manufactured at low cost and are easy to handle.

For example, three planetary gears are provided in the first plane. Preferably, the planet gears are arranged at a uniform distance from one another, i.e., at an angle of 120 ° to one another relative to the longitudinal axis.

For example, at least three planet gears are arranged in the second plane. In this case, the planet gears are also preferably arranged at uniform distances from one another, i.e. at angles of 120 ° to one another relative to the longitudinal axis.

For example, the first plane is arranged above the second plane, preferably directly above each other. The arrangement of the power branch and at least three planetary gears per stage results in a very compact design of the gear unit according to the invention. By means of the power branch, a smaller power to be transmitted is caused in the second stage, so that this second stage can have a smaller size.

For example, the planetary gear carrier is designed as an internal gear, in which all other gears of the epicyclic gear are arranged. On the one hand, the epicyclic gearing is thus covered by the planet carrier as the radially outermost boundary, and on the other hand, the planet carrier can thus be easily removed from the epicyclic gearing upwards.

Drawings

An embodiment of the invention is described in more detail below with the aid of the figures. Wherein:

fig. 1 schematically shows a longitudinal section of a retarder according to the invention.

Detailed Description

Fig. 1 shows a schematic longitudinal section through a gear unit according to the invention. The gear unit has a base plate 1 and an upwardly projecting housing wall 2, on which an output flange 3 is mounted by means of bearings 4. The output flange 3 can be connected to the grinding disc of a roller disc mill (not shown for the sake of clarity).

For connection to the drive device, a horizontally arranged drive shaft 5 is provided, which is provided at the top with a conical pinion 6. The conical pinion 6 engages a horizontal bevel gear 7 with a vertical output shaft 8. The output shaft 8 is connected axially in a positive-locking manner to the central pinion 9. This can be achieved, for example, by means of a coupling, as shown in fig. 1.

The central pinion 9 engages a set of planet gears 10, which are arranged in a mid-plane of the reduction gear. Each planet gear 10 is supported in a planet gear carrier 14 by journals 12. The planet gear carrier 14 is directly connected to the output flange 3 in a non-positive manner.

In a second plane, here for example below the first plane with the set of planet gears 10, a second set of planet gears 15 is arranged. The planet gears 15 are arranged in a stationary manner on a carrier 16 which is fixedly or detachably connected to the housing 2 of the gear unit. The second set of planet gears 15 engages an internal gear 20 which is connected to the planet gear carrier 14 or is formed thereon. Thus, for example, the carrier 16 can be simply inserted from above into the housing 2 of the gear unit and connected thereto, for example, by means of screws. It is advantageous here that the planet gears 15 can already be preassembled on the carrier 16.

Between the two sets of planet gears 10 and 15, an intermediate gear 17 is provided which is freely rotatable about the gear vertical axis a of the reduction gear and has toothing of an internal gear 18, in which the planet gears 10 of the first set engage, and a central pinion 19, which engages in the planet gears 15 of the second set. The intermediate gear 17 can be simply inserted or inserted from above into the reduction gear unit after the carrier 16 and the planet gears 15 have been inserted. With this arrangement, the planet gear carrier 14 can finally be mounted from above, so that a complete reduction gear is formed.

In the reverse order, the retarder unit can finally advantageously be disassembled again into the individual components. Maintenance work can thereby be performed without, for example, removing or removing the entire reduction gear unit from the housing 2.

This arrangement makes it possible to provide a power branch of the operating power supplied via the drive shaft 5. In this case, the power output is realized on the one hand via the journals 12 of the first set of planet gears 10 directly in the planet gear carrier 14 and on the other hand via the second set of planet gears 15 via the ring gear 20 in the planet gear carrier 14.

The design of the retarder results in a very compact construction which can also be assembled easily and disassembled for repair or maintenance or repair work equally easily.

Claims (5)

1. Heavy-duty reduction gear for driving a roller mill, comprising a bevel gear stage (6, 7) with a horizontal drive shaft (5) and a vertical driven shaft (8) and a multistage epicyclic gearing which is connected to the driven shaft (8) via a central pinion (9) and can be connected to the grinding disks of the roller mill via an output flange (3), characterized in that first planet gears (10) which engage in a first plane with the central pinion (9) are arranged on a planet gear carrier (14), the planet gear carrier (14) being connected to the output flange (3), and in that second planet gears (15) are arranged in a second plane, the shafts of which are connected to the reduction gear housing (2) and which engage in a first planet gear (20) which is connected to or formed on the planet gear carrier (14) and which in turn internally toothed On the other hand, engages a central pinion (19) of an intermediate gear (17), which also has a second internal gear (18) which engages externally with the first planetary gear (10) of the first plane.

2. A heavy duty retarder according to claim 1 wherein at least three first planet gears are provided in the first plane.

3. A heavy duty retarder according to claim 1 or 2 wherein at least three second planet gears are provided in the second plane.

4. A heavy duty retarder according to claim 1 or 2 wherein the first plane is disposed above the second plane.

5. A heavy duty retarder according to claim 4 wherein the first and second planes are located directly above each other.