KR101619000B1 - Drive arrangement for a vertical roller mill - Google Patents

Abstract

The driving device 1 for the vertical roller mill comprises a housing 10, a pressure plate 20 supported by the housing rotatably about a vertical pressure plate rotary shaft R1, An electric drive means (50) including at least one rotor (53, 55) integrated in the housing under the gearing and having a rotor rotation axis (R2, R3) And the rotary shaft extends offset parallel and radially with respect to the pressure plate rotary shaft, and at least one of the rotors is rotatably driven and coupled to the gear device by the spur gear (70). The present invention provides a drive system that requires less structural and manufacturing complexity in improving operating performance. This means that the drive means comprises at least two electric motors each having a rotor, the rotor rotational axes of which extend parallel to the pressure plate rotational axis and offset radially, To the gear device.

Description

[0001] DRIVE ARRANGEMENT FOR A VERTICAL ROLLER MILL [0002]

The present invention relates to a driving device for a vertical roller mill or table roller mill formed according to the preamble of claim 1.

A driving device of the above-described type is disclosed, for example, in DE 20 2008 017 994 U1. In the drive device described in the publication, the electric drive means includes one electric motor, and the rotor of the electric motor is driven and coupled to the gear device driven and driven by the pressure plate by the one-stage speed ratio fixed spur gear.

This embodiment of the electric drive means is based on an electric motor with a high drive output, since one electric motor must provide 100% of the rated drive output or the total drive output to the vertical roller mill, Therefore, it must be implemented in a special structure (for example, with an oil-cooled or water-cooled electric motor that is permanently excited at an average speed), which increases structural and manufacturing complexity. Also, in the event of failure of one electric motor, the whole vertical roller mill may fail, which may adversely affect the operating performance of the roller mill.

The object of the present invention is to provide a drive device for a vertical roller mill which is formed according to the preamble of claim 1 and which requires less structural and manufacturing complexity in the improvement of operating performance.

The above object is solved by a driving apparatus according to claim 1.

Improvements to the invention are set forth in the independent claims.

A drive device for a vertical roller mill according to the invention comprises a housing, a pressure plate (or pressure ring) supported on the housing rotatably about a vertical pressure plate rotary shaft and forming a driven part of the drive device with respect to the vertical roller mill, A gear device disposed in the housing and supported in the housing and rotatably drivingly coupled to the pressure plate; and a gear device integrated within the housing under the gear device and having a rotor rotational axis extending parallel to the pressure plate rotational axis and offset radially outward Wherein at least one of the rotors is rotatably driven by a spur gear to the gear device. The drive device according to the present invention is characterized in that the electric drive means comprises at least two electric motors each having a rotor, the rotor axes of the rotors extending respectively offset and parallel to the pressure plate rotational axis and radially outward, And the rotors are rotationally driven and coupled to the gear device by a spur gear.

By virtue of the electric drive means having at least two electric motors according to the invention, the drive system requires less structural and manufacturing complexity in improving the operating performance.

More precisely, all electric motors are constructed or designed to provide only a nominal drive output or a partial drive output (less than 100%, e.g. 50%) of the total drive output to the vertical roller mill. It is therefore possible to use electric motors of standard construction with high speed and power density. These electric motors require less structural and manufacturing complexity, and are also very compact in construction.

For example, one conventional electric motor described in DE 20 2008 017 994 U1 is a special design which is costly in some cases for limiting the starting current. When the starting current is replaced by a plurality of electric motors as in the present invention, the starting current limitation is effectively achieved by direct switching on of one (weaker output) electric motor.

According to the embodiment of the present invention, the electric motors of the electric drive means are each formed as a standard motor. This relates in particular to the configuration according to the speed and dimensions of the electric motor. According to another embodiment of the present invention, the electric motors of the driving means at the time of rolling are formed as four-pole or six-pole three-phase current motors. Preferably, the motor is a water-cooled electric motor.

Since at least two electric motors are provided, the vertical roller mill can continue to operate with reduced output in the event of failure of one electric motor, thereby improving operating performance.

By means of the compact construction of the electric motor, it is possible to couple the electric motors to a gear device, preferably comprising one or more planetary gears, by means of a spur gear.

By incorporating the electric motors into the gear according to the invention, the clutch between the electric motors and the gear device (as in the case of an electric motor provided outside the gear) can be omitted, which simplifies the assembly of the device.

According to another embodiment of the present invention, the number of electric motors of the electric drive means is 2 to 8. This allows a more compact design of the electric motor to further improve the operating performance of the vertical roller mill.

According to an embodiment of the present invention, the electric motors of the electric drive means are each formed as an asynchronous three-phase current motor. The construction and manufacture of the electric motors are particularly simple, are provided in various sizes, and are also very robust. This further reduces structural and manufacturing complexity when further improving operating performance.

According to the embodiment of the present invention, since the electric motors of the electric drive means each have a gentle characteristic curve, the entire drive load is uniformly distributed to all the electric motors during operation of the electric motor, and no special control device is required.

A gentle characteristic curve (also referred to as a quasi-field characteristic curve) is achieved by a fairly load-dependent speed of the electric motor. The speed of such an electric motor decreases rapidly as the load increases, and increases correspondingly when the load is reduced. Thus, the individual electric motors of the electric drive means can be quickly and simply adapted to each other, whereby the entire drive load is evenly distributed to all electric motors uniformly.

Alternatively, the electric motors of the electric drive means can each be controlled by a frequency converter, so that during operation of the electric motors the total drive load is evenly distributed to all the electric motors and, if necessary for milling operations, .

According to an embodiment of the present invention, the spur gear includes a center wheel disposed on a central shaft coaxially extending with respect to a pressure plate rotary shaft, and includes a pinion in a toothing state with a center wheel in a driven shaft of each electric motor In which case the electric motors are uniformly or non-uniformly distributed by the respective pinions in the circumference of the center wheel. Such a pinion may be supported in the gear or may be disposed directly on the motor shaft. Also, in another embodiment, the pinions are received within the cover and are independently coupled to the housing. This allows individual motors to mechanically shut down by disconnecting the corresponding pinion, in which case mounting complexity is not increased.

A relatively low cost, low power density torque transmission system used in a general drive system (described, for example, in DE 199 17 607 C2), which is complicated to mount and requires complicated bearings and housings, Spur gears, in contrast to this, are simple, inexpensive, and have a higher output density.

The sun gear wheel or line pinion of the first planetary gear of the gear device may be implemented as a shaft pinion. Connecting a sun gear wheel of a first planetary gear to a bevel gear wheel shaft in a conventional gear equipped with a bevel gear is complicated and difficult.

According to another embodiment of the present invention, since the spur gear has two gear ratios selectively switchable, two different speeds selectable at the driven portion of the drive apparatus can be provided. In other words, the spur gear preferably includes two gear stages that are alternatively switchable instead of a single spur gear wheel stage, which enables milling of various materials and can be implemented at lower cost than frequency control.

According to the embodiment of the present invention, the housing has a cross-shaped reinforcement portion in a space formed between the electric motors, and the intersection point of the reinforcement portion is placed on the pressure plate rotary shaft. In other words, the housing preferably supports the mill by means of a cruciform support in the region of the electric motor, and the support is disposed between the electric motors. When four or more motors are used, a cylindrical support may be used.

In conclusion, according to the general idea of the present invention, there is provided a driving portion of a gear for a vertical roller mill (table mill), characterized in that it is equipped with at least one vertical driving motor for driving a common wheel by a respective pinion .

Also in accordance with the present invention there is provided a vertical roller mill comprising, in all possible combinations, a drive according to one, many or all of the embodiments of the invention described above. For certain vertical roller mills, so-called secondary drives or maintenance drives are required. This requirement can be realized by one of the pinion drives.

The present invention can also be extended to embodiments not provided as a combination of features of the stated cited claims, whereby the disclosed features of the present invention can be combined with each other as long as technically significant.

BRIEF DESCRIPTION OF THE DRAWINGS In the following, the invention will be described with reference to the attached drawings, with reference to preferred embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows a drive device for a vertical roller mill according to the prior art; Fig.
2 is a view illustrating a driving apparatus for a vertical roller mill according to an embodiment of the present invention.

1 shows a driving device 1 'of a vertical roller mill (not fully shown) according to the prior art. Such a drive system is described, for example, in DE 199 17 607 C2.

As shown in Fig. 1, the drive 1 'is supported on a housing 10', a housing 10 'and connected to a milling table (not shown) of a vertical roller mill, For example, a ring type pressure plate 20 'forming a ring gear 21', a gear device 30 'disposed in the housing 10' below the pressure plate 20 'and supported by the housing and rotationally engaged with the pressure plate 20' An electric drive means 50 'for driving the vertical roller mill and a bevel gear 60' for rotational drive coupling of the electric drive means 50 'to the gear device 30'.

The gear device 30 'includes a first planetary gear 31' and a second planetary gear 41 ', which are rotationally coupled to each other.

The electric drive means 50 'is formed by one electric motor disposed outside the housing 10' in slip ring implementation (for the reduction of the starting current), in which case the electric motor drives the clutch 51 ' To the input shaft 61 'of the bevel gear 60'. The sun gear wheel 32 'of the first planetary gear 31' is mounted relative to the output shaft 62 'of the bevel gear 60' so that the sun gear wheel 32 ' 30 '. The driven portion of the gear device 30 'to the pressure plate 20' is implemented by the planetary carrier 43 'of the second planetary gear 41'.

Reference is made, for example, to DE 199 17 607 C2 in connection with the connection of the first and second planetary gears 31 ', 41' and with further details concerning the mounting or support of the planetary gears in the housing 10 '.

Referring now to Figure 2, there is shown a drive device 1 of a vertical roller mill (not fully shown) according to an embodiment of the present invention.

2, the drive 1 is supported by the housing 10 rotatably about a housing 10, a vertical pressure plate rotation axis R1, and is supported on a milling table (not shown) of a vertical roller mill A ring-shaped pressure plate 20 for forming a driven portion 21 of the drive device 1; a gear-type pressure plate 20 disposed in the housing 10 below the pressure plate 20 and supported by the housing, The apparatus 30 includes an electric drive means 50 for driving the vertical roller mill and a spur gear 70 for rotational drive coupling of the electric drive means 50 to the gear device 30. [

The gear device 30 includes a first planetary gear 31 and a second planetary gear 41 selectively, and the planetary gears are rotatably drive-coupled to each other.

The electric drive means 50 comprises at least two preferably water-cooled electric motors 52, 54 each having rotors 53, 55, and the rotor rotational axes R2, And is rotatably driven and coupled to the gear device 30 by a spur gear 70, respectively.

The number of the electric motors 52, 54 of the electric drive means 50 in relation to the present invention is preferably 2 to 8. More than six electric motors 52, 54 are not excluded by the present invention, and may be applied where appropriate or necessary.

Specifically, the spur gear 70 includes a middle wheel 71, which is coaxially extended with respect to the pressure plate rotary shaft Rl, and which has a central shaft 72 rotatably supported on the housing 10, . The spur gear 70 includes a number of pinions 73 and 74 corresponding to the number of the electric motors 52 and 54. In this case, the pinions 73 and 74 are connected to the electric motors 52 and 54, So as to be rotatable relative to the respective driven shafts 53a and 55a of the first and second drive shafts 53 and 55a. As shown in Fig. 2, the electric motors 52, 54 are uniformly distributed around the circumference of the center wheel 71 by the respective pinions 73, 74.

Although not shown in FIG. 2, according to the embodiment of the present invention, since the spur gear 70 has two gear ratios selectively switchable, two different speeds selectable in the driven portion 21 of the drive device 1 Can be provided.

The housing 10 has a cruciform reinforcing portion 11 (not shown completely) in a space S formed between the electric motors 52 and 54 and the intersection of the reinforcing portion is placed on the pressure plate rotary shaft R1.

2, all the electric motors 52, 54 of the electric drive means 50 are incorporated in the housing 10 so as to be supported on the housing and preferably disposed on the periphery of the housing. The oil tank system can be located at the base height, and the descending device or bilge pump can be omitted.

The sun gear wheel 32 of the planetary gear 31 is mounted on the center shaft 72 in a relatively non-rotatable manner. In this case, the sun gear wheel 32 performs the movement into the gear device 30. The driven portion of the gear device 30 with respect to the pressure plate 20 is realized by the planetary carrier 43 of the second planetary gear 41. [

Specifically, the sun gear wheel 32 is centered between the planetary gear wheels 34 of the first planetary gear 31 in a floating manner. The annular planetary gear wheels 34 of the first planetary gear 31 are rotatably supported within the planetary carrier 33 of the first planetary gear 31. The planetary carrier 33 of the first planetary gear 31 is fixed to the planetary gear wheel 34 of the first planetary gear 31 engaged with the internal gear wheel 35 fixed (fixed to the housing 10) In the radial direction. The planetary carrier 33 of the first planetary gear 31 is rotatably driven and coupled to the sun gear wheel 42 of the second planetary gear 41 by the cylindrical extension portion 33a. The planetary gear wheel 44 of the second planetary gear 41 meshing with the centering sun gear wheel 42 of the second planetary gear 41 is fixed to the fixed And is rolled by the gear wheel 45. The planetary carrier 43, to which the planetary gearwheel 44 of the second planetary gear 41 is rotatably supported, rotates and is fixed thereto with the planetary carrier and is supported by the axial thrust bearings 22, Like pressure plate 20 supported by the ring-shaped pressure plate 10.

The electric motors 52, 54 of the electric drive means 50 are preferably each formed as a standard motor, which is particularly related to the configuration according to the speed and dimension of the motor. The electric motors 52, 54 of the electric drive means 50 are preferably formed as 4-pole or 6-pole three-phase current motors, respectively, particularly asynchronous-3-phase current motors.

In the case of the preferred asynchronous three-phase current motor, the electric motors 52 and 54 of the electric drive means 50 each have a gentle characteristic curve or an empirical field characteristic curve, so that the operation of the electric motors 52 and 54 The total drive load of the vertical roller mill is evenly distributed to all the electric motors 52, Alternatively, the electric motors 52 and 54 of the electric drive means 50 may be speed-or torque-controlled by a frequency converter (not shown), and thus, during the operation of the electric motors 52 and 54, The load is evenly distributed to all electric motors 52, 54, and the milling device can be operated at a speed regulated.

In a variation not claimed here, the housing is a ring each of which is interrupted by an electric motor or adjusted to the arrangement of the motor.

1 drive
1 'driving device
10; 10 'housing
11 reinforcement portion
20; 20 'pressure plate
21; 21 '
22, 23 axial thrust bearings
30; 30 'gear unit
31; 31 'first planetary gear
32; 32 'Line Gear Wheel
33 planetary carrier
33a cylindrical extension
34 planetary gear wheel
35 internal gear wheel
41; 41 'Second planetary gear
42 Gear Wheel
43; 43 'planetary carrier
44 planetary gear wheel
45 internal gear wheel
50; 50 'Electric drive means
51 'clutch
52, 54 electric motor
53, 55 rotors
53a, 55a driven shaft
60 'Bevel gear
61 'input shaft
62 'output shaft
70 spur gear
71 Center wheel
72 Center shaft
73, 74 pinion
R1 pressure plate rotary shaft
R3, R3 Rotor rotating shaft
S space

Claims (10)

A drive device (1) for a vertical roller mill,
The housing 10,
A pressure plate 20 supported on the housing 10 so as to be rotatable about a vertical pressure plate rotary shaft R1 and forming a driven portion 21 of the drive device 1 with respect to a vertical roller mill,
A gear device (30) disposed in the housing (10) below the pressure plate (20) and supported by the housing and rotationally engaged with the pressure plate (20)
At least one rotor having a rotor rotational axis (R2, R3) integrated within the housing (10) below the gearing (30) and extending axially and radially offset relative to the pressure plate rotational axis (R1) (50) including an electric motor (53, 55)
Wherein at least one of the rotors (53, 55) is rotatably driven by the spur gear (70) to the gear device (30)
The electric drive means (50) includes at least two electric motors (52,54) having rotors (53,55), respectively, and the rotor rotation axes (R2, R3) R1, and the rotors are rotatably drive-coupled to the gear device 30 by spur gears 70, respectively,
The spur gear 70 includes a center wheel 71 and at least two pinions 73 and 74 which are in a toothed state with the center wheel 71. The center wheel 71 rotates only the center shaft 72 To the sun gear wheel (32) of the gear device (30). The drive system according to claim 1, wherein the number of the electric motors (52, 54) of the electric drive means (50) is 2 to 8. 3. Drive device according to claim 1 or 2, characterized in that said electric motors (52, 54) of said electric drive means (50) are each formed as a standard motor. 3. Drive device according to claim 1 or 2, characterized in that the electric motors (52, 54) of the electric drive means (50) are formed as four-pole or six-pole three-phase current motors. 3. Drive device according to claim 1 or 2, characterized in that said electric motors (52, 54) of said electric drive means (50) are each formed as an asynchronous-three phase current motor. The electric motor (52, 54) according to any one of claims 1 to 5, characterized in that each of the electric motors (52, 54) of the electric drive means (50) has a gentle characteristic curve, And the load is uniformly distributed to all the electric motors (52, 54). 3. The electric motor according to claim 1 or 2, wherein the electric motors (52, 54) of the electric drive means (50) are controlled by a frequency converter, Is uniformly distributed to all the electric motors (52, 54). 3. The hydraulic control apparatus according to claim 1 or 2, wherein the center wheel (71) is disposed on the central shaft (72) coaxially extending with respect to the pressure plate rotation axis (R1), and the pinions (73, 74) Is on the driven shafts (53a, 55a) of the electric motors (52, 54) and the electric motors (52, 54) are driven by the respective pinions (73, 74) And wherein the driving device is distributed and arranged. The spur gear (70) according to claim 1 or 2, wherein the spur gear (70) has two speed ratios that can be selectively switched, so that the driven portion (21) of the drive device And the driving force of the driving device. 3. The compressor according to claim 1 or 2, wherein the housing (10) has a cruciform reinforcing portion (11) in a space (S) formed between the electric motors (52, 54) (R1). ≪ / RTI >

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