WO2013010616A2

WO2013010616A2 - Drive arrangement for a vertical roller mill

Info

Publication number: WO2013010616A2
Application number: PCT/EP2012/002632
Authority: WO
Inventors: Peter Boiger; Andreas Gernt; Toni Weiss; Ingo Sommer
Original assignee: Renk Aktiengesellschaft
Priority date: 2011-07-21
Filing date: 2012-06-22
Publication date: 2013-01-24
Also published as: CN103826749A; DE102011079555A1; KR101619000B1; KR20140050683A; EP2734303B1; PL2734303T3; JP2014520668A; CN103826749B; EP2734303A2; DE102011079555B4; JP6282587B2; WO2013010616A3

Abstract

The invention relates to a drive arrangement (1) for a vertical roller mill, having: a housing (10), a pressure plate (20) which is supported on the housing in a rotatable manner about a vertical pressure plate rotation axis (R1), a transmission device (30) which is arranged, beneath the pressure plate, in the housing, is supported on the latter and is in rotary driving connection with the pressure plate, and drive means (50) which are driven by an electric motor, are integrated, beneath the transmission device, into the housing and have at least one rotor (53, 55) having a rotor rotation axis (R2, R3) which extends parallel to and radially offset with respect to the pressure plate rotation axis, wherein the at least one rotor is in rotary driving connection with the transmission device via a spur gear transmission (70). The invention provides a drive arrangement which, with improved operating capacity, requires less structural and production complexity. This is achieved in that the drive means have a number of at least two electric motors each having rotors, the rotor rotation axis of which extends in each case parallel to and radially offset with respect to the pressure plate rotation axis and which are each in rotary driving connection with the transmission device via the spur gear transmission.

Description

Drive arrangement for a vertical roller mill

The invention relates to a trained according to the preamble of claim 1 drive arrangement for a vertical roller mill or roller mill.

A drive arrangement of the aforementioned type is known for example from DE 20 2008 017 994 U1. In the drive arrangement described in this document, the electromotive drive means to a single electric motor, the rotor via a single-stage translation resistant

Spur gear in drive connection with one with a pressure plate

drive-connected transmission device is.

This configuration of the electromotive drive means, since the only electric motor must provide 100 percent of a rated drive power or total drive power of the vertical roller mill, an electric motor large drive power, so that this possibly in a special construction (eg as oil or water cooled permanently energized electric motor with medium speed ), which increases the construction and manufacturing costs. In addition, in case of failure of the single electric motor fails the entire veftikal-RollenmühTe, which may affect their operability.

The invention has for its object to provide a trained according to the preamble of claim 1 drive arrangement for a vertical roller mill, the drive assembly with improved operability requires less design and manufacturing effort. This is achieved with a drive arrangement according to claim 1.

Further developments of the invention are defined in the dependent claims.

According to the invention, a drive arrangement for a vertical roller mill comprises: a housing, a pressure plate (or pressure ring) which is around a vertical

Platen rotation axis is rotatably supported on the housing and forms an output of the drive assembly for vertical roller mill out, a

Transmission means, which is arranged below the pressure plate in the housing and supported on the latter and which is in rotary drive connection with the pressure plate, and electromotive drive means, which below the

Transmission device are integrated into the housing and having at least one rotor with a rotor axis of rotation which extends parallel and radially outwardly offset to the pressure plate rotational axis, wherein the at least one rotor via a spur gear is in rotary drive connection with the transmission device. The drive arrangement according to the invention is characterized in that the electromotive drive means a number of at least two

Have electric motors with respective rotors, the rotor axis of rotation in each case parallel and radially outwardly offset to the pressure plate axis of rotation extends and in each case via the spur gear in rotary drive connection with the

Gear device stand.

Because, according to the invention, the electromotive drive means comprise a number of at least two electric motors, which requires

Drive arrangement with improved operability a smaller

Construction and manufacturing effort.

More specifically, each electric motor may preferably be configured or

be dimensioned to provide only a partial drive power (less than 100 percent, such as 50 percent) of rated drive power of the vertical roller mill. This makes it possible to use electric motors in

Standard design to use a high speed and thus Have power density. These electric motors require a smaller one

Design and manufacturing effort and build also very compact.

The e.g. in DE 20 2008 017 994 U1 described conventional single

Electric motor may be expensive to limit inrush current

Special design. If the inrush current is replaced by a plurality of electric motors as in the invention, then the direct switching on of a single one is required

(less powerful) electric motor an effective inrush current limit.

According to one embodiment of the invention, the electric motors of the electromotive drive means are therefore each designed as a standard motor. This concerns in particular the speed and the dimensional configuration of the electric motors. According to a further embodiment of the invention, the electric motors of the electromotive drive means are each designed as a four-pole or six-pole three-phase motor. Preferably, the electric motors are water-cooled electric motors.

Because at least two electric motors are provided, the vertical roller mill can continue to operate in case of failure of an electric motor with reduced power, whereby their operability is improved.

Due to the compact design of the electric motors, it is possible to connect them via the spur gear with the transmission device, which preferably has one or more planetary gear.

The inventive integration of the electric motors in the transmission, a clutch (as in an externally provided for the transmission electric motor) between the electric motors and the transmission device omitted, which simplifies the system assembly. According to yet another embodiment of the invention, the number of electric motors of the electromotive drive means is two to eight. This allows an even more compact design of the electric motors while still further improving the operability of the vertical roller mill.

According to yet another embodiment of the invention, the electric motors of the electromotive drive means are each designed as an asynchronous three-phase motor. These electric motors are particularly simple in design and manufacture, are available in many sizes and are also very robust. As a result, the design and manufacturing effort is reduced even more with still improved operability.

According to one embodiment of the invention, the electric motors of the electromotive drive means each have a soft characteristic, so that during operation of the electric motors, a total drive load evenly on all

Electric motors is distributed without the need for special regulation.

Achieve a soft characteristic (also known as a series-connected characteristic)

Electric motors with high load-dependent speed. The speed of these electric motors thus drops rapidly with increasing load and increases accordingly in relief. Thus, the individual electric motors of the electromotive drive means can quickly and easily be matched to each other, whereby the total drive load is evenly distributed to all electric motors.

Alternatively, the electric motors of the electromotive drive means may each be controlled by a frequency converter, so that during operation of the electric motors, the total drive load is evenly distributed to all electric motors and a speed-controlled grinder is formed, if required for the grinding operation. According to yet another embodiment of the invention, the spur gear has a central gear disposed on a central shaft extending coaxially with the platen rotation axis, and a pinion gear meshing with the central gear on an output shaft of each electric motor, wherein

Electric motors are arranged with their pinions evenly or non-uniformly distributed around a circumference of the central wheel. These pinions can each be stored in the gearbox or mounted directly on the motor shafts. Also, a further embodiment provides that the pinion housed in hoods are independently connected to the housing. This makes it possible to mechanically disable individual motors by removing their associated pinion, without increased assembly costs.

Unlike in conventional drive arrangements (such as in

DE 199 1 7 607 C2 also described bevel gear, which is a comparatively expensive way of torque transmission low power density and demanding in the assembly, and requires a complex storage and a complex housing, a spur gear in this regard is simpler and cheaper and has a higher power density.

A sun gear or sun gear of a first planetary gear of the

Transmission device can be designed as a shaft pinion. In previous, equipped with bevel gearboxes, the connection of the sun gear of the first planetary gear to the bevel gear shaft is complex and sensitive.

According to yet another embodiment of the invention, the

Spur gear two selectively switchable translations, so that at the output of the drive assembly, two selectively selectable different speeds are available. In other words, the spur gear preferably has two alternatively switchable instead of a simple spur gear Translation levels, which allows the grinding of different materials and cost can be performed as a frequency control.

According to yet another embodiment of the invention, in a space formed between the electric motors, the housing has a cross-shaped stiffening whose intersection point lies on the printing plate rotation axis. In other words, the housing preferably supports the mill in the region of the electric motors by a support cross, which finds place between the electric motors. When using more than four motors, a support cylinder can be used.

In conclusion, according to a most general inventive idea by the invention, a drive of a transmission for vertical roller mills (bowl mills) is provided, which is characterized by the attachment of more than one vertical drive motor to the transmission, each driving a common wheel with one pinion.

Finally, according to the invention, a vertical roller mill with a drive arrangement according to one, several or all previously described embodiments of the invention is provided in every conceivable combination. In certain vertical mills is a so-called auxiliary drive or

Maintenance drive needed. This requirement can be realized via one of the pinion drives.

The invention also expressly extends to such embodiments which are not characterized by feature combinations of explicit back references of

Claims are given, whereby the disclosed features of the invention - as far as is technically feasible - can be combined with each other.

In the following the invention will be described in more detail by means of a preferred embodiment and with reference to the attached figures. shows a drive assembly of a vertical roller mill according to the prior art.

shows a drive arrangement of a vertical roller mill according to an embodiment of the invention.

1 shows a drive assembly 1 'of a vertical roller mill (not fully shown) according to the prior art. Such a drive arrangement is e.g. in DE 199 17 607 C2.

As can be seen from Fig. 1, the drive assembly V comprises a housing 10 ', e.g. annular pressure plate 20 ', which is rotatably supported on the housing 10' and which forms an output 2Γ of the drive assembly V to a grinding bowl (not shown) of the vertical roller mill, a transmission device 30 ', which is below the pressure plate 20' in the housing 10 'is arranged and supported on this and is in rotational drive connection with the pressure plate 20', electromotive drive means 50 'for driving the vertical roller mill and a bevel gear 60' for the rotary drive connection of the electromotive

Drive means 50 'with the transmission device 30' on.

The transmission device 30 'has a first planetary gear 3V and a second planetary gear 41', which are in rotary drive connection with each other.

The electromotive drive means 50 'are of a single external of the housing 10' arranged electric motor in grinding ring execution (for

Reduction of the starting current), wherein the electric motor via a coupling 5Γ in rotational drive connection with an input shaft 61 'of the

Bevel gear 60 'is. On an output shaft 62 'of the bevel gear 60' is rotatably mounted a sun gear 32 'of the first planetary gear 31', wherein the sun gear 32 'realized a drive into the transmission device 30'. One Output of the transmission device 30 'to the pressure plate 20' out is through a

Planet carrier 43 'of the second planetary gear 41' realized.

For further details on the interconnection of the first and second

Planetary gear 31 ', 41' and their support in the housing 10 'is e.g. to DE 199 17 607 C2.

In the following, a drive arrangement 1 of a vertical roller mill (not completely shown) according to an embodiment of the invention will be described with reference to FIG.

As can be seen from Fig. 2, the drive assembly 1 comprises a housing 10, e.g. annular pressure plate 20 which is rotatably supported on the housing 10 about a vertical pressure plate rotation axis R1 and which forms an output 21 of the drive assembly 1 toward a grinding bowl (not shown) of the vertical roller mill; a transmission device 30 located below the pressure plate 20 is disposed in the housing 10 and supported thereon and which is in rotary drive connection with the pressure plate 20, electromotive drive means 50 for driving the vertical roller mill and a spur gear 70 for the rotary drive connection of the electromotive drive means 50 to the transmission means 30.

The transmission device 30 has a first planetary gear 31 and optionally a second planetary gear 41, which are in rotary drive connection with each other.

The electromotive drive means 50 have a number of at least two preferably water-cooled electric motors 52, 54 with respective rotors 53, 55, the rotor rotational axis R2, R3 respectively parallel and radially offset from Platen rotation axis R1 runs and each of the spur gear 70 in rotary drive connection with the transmission device 30 are.

In the context of the invention, the number of electric motors 52, 54 of the electromotive drive means 50 is preferably two to eight. However, a greater number than six electric motors 52, 54 should not be expressly excluded from the invention and may, where appropriate or desired, be applied.

In detail, the spur gear 70 has a central gear 71, which is arranged on a coaxial with the printing plate rotational axis R1 rotatably mounted on the housing 10 central shaft 72. The spur gear 70 also has a number of electric motors 52, 54 corresponding number of pinions 73, 74, wherein the respective pinion 73, 74 rotatably on a respective output shaft 53a, 55a of the electric motors 52, 54 are arranged and all with the common central wheel 71 are in mesh. As can be seen from FIG. 2, the electric motors 52, 54 with their respective pinions 73, 74 are distributed uniformly around a circumference of the central wheel 71.

Although not shown in FIG. 2, according to one embodiment of the invention, the spur gear 70 may have two selectively shiftable ratios, so that two selectively selectable rotational speeds can be provided at the output 21 of the drive assembly 1.

In a space S formed between the electric motors 52, 54, the housing 10 has a cross-shaped stiffener 11 (not completely shown) whose intersection point lies on the printing plate rotation axis R1.

As can be seen from FIG. 2, all electric motors 52, 54 of the electromotive drive means 50 are integrated into the housing 10 in such a way that they are supported on the housing 10 or stored and preferably received in its outer contour. A tank oil plant can be installed at foundation height, a lowering or a bilge pump can be omitted.

On the central shaft 72, a sun gear 32 of the planetary gear 31 is rotatably mounted, wherein the sun gear 32 realizes a drive into the transmission device 30. An output of the transmission device 30 to the pressure plate 20 is realized by a planet carrier 43 of the second planetary gear 41.

In detail, the sun gear 32 is centered between planetary gears 34 of the first planetary gear 31. The revolving planet wheels 34 of the first planetary gear 31 are in a planetary carrier 33 of the first

Planetary gear 31 rotatably mounted. The planet carrier 33 of the first

Planetary gear 31 is guided in the radial direction over the with a fixed (fixed to the housing 10) ring gear 35 meshing planet gears 34 of the first planetary gear 31. The planet carrier 33 of the first

Planetary gear 31 is connected via a cylindrical extension 33 a with a

Sun gear 42 of the second planetary gear 41 drehantriebsverbunden. With the fly-centered sun gear 42 of the second planetary gear 41 meshing planet gears 44 of the second planetary gear 41 roll in a fixed (fixed to the housing 10) ring gear 45 from. The planet carrier 43, on which the planet gears 44 of the second planetary gear 41 are rotatably mounted, runs around and with it the rigidly attached thereto and over

Axialdrucklager 22, 23 supported on the housing 10 annular pressure plate 20th

The electric motors 52, 54 of the electromotive drive means 50 are preferably each designed as a standard motor, which relates in particular to their rotational speed and dimensional configuration. The electric motors 52, 54 of

Electromotive drive means 50 are preferably each designed as a four-pole or six-pole three-phase motor, in particular as an asynchronous three-phase motor. In the case of the preferred asynchronous three-phase motors, the

Electric motors 52, 54 of the electric motor drive means 50 each have a soft characteristic or series closure characteristic, so that during operation of the electric motors 52, 54 a total drive load of the vertical roller mill is evenly distributed to all electric motors 52, 54. Alternatively, the electric motors 52, 54 of the electromotive drive means 50 per

Frequency converter (not shown) be speed or torque controlled, so that during operation of the electric motors 52, 54, the total drive load is evenly distributed to all electric motors 52, 54 and the grinding system can be operated speed controlled.

A currently not yet claimed variant provides that the housing corresponds to a ring, which is interrupted in each case by the electric motors or adapted to the arrangement of these motors.

LIST OF REFERENCE NUMBERS

1 drive arrangement

V drive arrangement

10; 10 'case

1 1 stiffening

20; 20 "pressure plate

21; 21 "downforce

22, 23 Axialdrucklager

30; 30 ^* gear mechanism

31; 31 'first planetary gear

32; 32 'sun wheel

33 planet carrier

33a cylindrical extension

34 planetary gear

35 ring gear

41; 41 "second planetary gear

42 sun gear

43; 43 'planet carrier

44 planetary gear

45 ring gear

50; 50 'electromotive drive means

5V clutch

52, 54 electric motor

53, 55 rotor

53a, 55a output shaft

60 'bevel gear

61 "input shaft

62 'output shaft

70 spur gear

71 central wheel

72 central shaft

73, 74 pinion

R1 plate rotation axis

R2, R3 rotor axis of rotation

S room

Claims

claims

1 . Drive arrangement (1) for a vertical roller mill, comprising:

a housing (10),

a pressure plate (20) which is rotatably supported on the housing (10) about a vertical pressure plate rotation axis (R1) and which forms an output (21) of the drive arrangement (1) towards the vertical roller mill,

a transmission device (30) which is arranged below the pressure plate (20) in the housing (10) and supported on this and the in

Rotary drive connection with the pressure plate (20) is, and

electromotive drive means (50), which are integrated below the transmission device (30) in the housing (10) and at least one rotor (53, 55) having a rotor axis of rotation (R2, R3), the parallel and radially offset from the pressure plate rotation axis (R1 ), wherein the at least one rotor (53, 55) via a spur gear (70) in rotary drive connection with the

Transmission device (30) is,

characterized in that the electromotive drive means (50) comprise a number of at least two electric motors (52, 54) with respective rotors (53, 55) whose rotor rotational axis (R2, R3) is parallel and radially offset from the platen rotational axis (R1) and each over the

Helical gear (70) in rotary drive connection with the transmission device (301 stand.

2. Drive arrangement (1) according to claim 1, wherein the number of

Electric motors (52, 54) of the electromotive drive means (50) is two to eight.

3. Drive arrangement (1) according to claim 1 or 2, wherein the electric motors (52, 54) of the electromotive drive means (50) are each designed as a standard motor.

4. Drive arrangement (1) according to one of claims 1 to 3, wherein the electric motors (52, 54) of the electromotive drive means (50) are each formed as a four-pole or six-pole three-phase motor.

5. Drive arrangement (1) according to one of claims 1 to 4, wherein the electric motors (52, 54) of the electromotive drive means (50) each as

Asynchronous three-phase motor are formed.

A drive assembly (1) according to any one of claims 1 to 5, wherein the electric motors (52, 54) of the electromotive drive means (50) each have a soft characteristic so that, during operation of the electric motors (52, 54), a total drive load evenly on all Electric motors (52, 54) is distributed.

7. Drive arrangement (1) according to one of claims 1 to 5, wherein the electric motors (52, 54) of the electromotive drive means (50) per

Frequency converter are controlled so that during operation of the electric motors (52, 54) a total drive load is evenly distributed to all electric motors (52, 54).

8. Drive arrangement (1) according to one of claims 1 to 7, wherein the spur gear (70) has a central wheel (71) on a coaxial with the

Platen rotational axis (R1) extending central shaft (72) is arranged, and on an output shaft (53a, 55a) of each electric motor (52, 54) one with the central wheel (71) in meshing pinion (73, 74), and wherein the

Electric motors (52, 54) with their respective pinions (73, 74) distributed around a circumference of the central wheel (71) are arranged.

9. Drive arrangement (1) according to one of claims 1 to 8, wherein the spur gear (70) has two selectively shiftable translations, so that at the output (21) of the drive assembly (1) two selectively selectable

different speeds are available.

10. Drive arrangement (1) according to one of claims 1 to 9, wherein the housing (10) in a between the electric motors (52, 54) formed space (S) has a cross-shaped stiffener (1) whose intersection point on the printing plate rotation axis (R1 ) lies.