CA2932845A1 - Roller mill and assembly for driving a roller mill - Google Patents
Roller mill and assembly for driving a roller mill Download PDFInfo
- Publication number
- CA2932845A1 CA2932845A1 CA2932845A CA2932845A CA2932845A1 CA 2932845 A1 CA2932845 A1 CA 2932845A1 CA 2932845 A CA2932845 A CA 2932845A CA 2932845 A CA2932845 A CA 2932845A CA 2932845 A1 CA2932845 A1 CA 2932845A1
- Authority
- CA
- Canada
- Prior art keywords
- roller
- displaceable
- rotor
- cardan shaft
- electric motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/42—Driving mechanisms; Roller speed control
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
- Friction Gearing (AREA)
Abstract
The subject matter of the invention is that a roller mill with a displaceable roller (1') is driven via an electric motor (2) with a rotor (21) which is mounted so as to be displaceable in an axial direction. Here, the displaceable roller (1') is mounted in an axial direction and in a radial direction. A cardan shaft (3) with a constant length is arranged between the electric motor (2) and the displaceable roller (1') such that the rotary movement of the rotor (21) can be converted into a rotary movement of the displaceable roller (1'). In the case of a displacement of the displaceable roller (1') orthogonal to the axial direction of the displaceable roller (1'), joints of the cardan shaft balance out the resulting angular displacement of the shaft of the displaceable roller (1') and the shaft of the electric motor (2). The resulting change in the distance between the shaft of the displaceable roller (1') and the shaft of the electric motor (2) is balanced out by the rotor (21) by an axial movement.
Description
DESCRIPTION
Roller mill and assembly for driving a roller mill TECHNICAL FIELD
The present invention relates to the field of roller mills. It concerns a roller mill having two contrarotating rollers which are rotatably mounted in a frame, and an assembly for driving such a roller mill.
PRIOR ART
Roller mills are used for grinding materials, in particular ores and cement. Roller mills typically have a roller diameter of 0.8 to 3 meters and a driving power of 0.2 to 5 megawatts. They are particularly energy-efficient by comparison with other types of mill. Such a roller mill is described, for example, in DE 4028015 Al.
As is diagrammatically illustrated in figure 1, a roller mill comprises two contrarotating rollers 1, 1', which rollers 1, l' are rotatably mounted horizontally and parallel to one another in a frame. Here, one of the two rollers 1 is generally fixed in the radial direction and another of the two rollers l' is pressed onto the fixed roller 1 by means of a spring system. Each roller 1, 1' has a grinding surface. The opposite grinding surfaces of the rollers 1, l' form a wedge. Material is filled from above between the rollers 1, 1' into the wedge, guided downward as a result of the rotation of the rollers 1, 1' and comminuted through the wedge. The rotation of the rollers 1, l' is achieved by means of a drive. In the case of known drives for roller mills, an electric motor is indirectly connected via movable mechanical elements to one of the rollers or to both rollers.
Roller mill and assembly for driving a roller mill TECHNICAL FIELD
The present invention relates to the field of roller mills. It concerns a roller mill having two contrarotating rollers which are rotatably mounted in a frame, and an assembly for driving such a roller mill.
PRIOR ART
Roller mills are used for grinding materials, in particular ores and cement. Roller mills typically have a roller diameter of 0.8 to 3 meters and a driving power of 0.2 to 5 megawatts. They are particularly energy-efficient by comparison with other types of mill. Such a roller mill is described, for example, in DE 4028015 Al.
As is diagrammatically illustrated in figure 1, a roller mill comprises two contrarotating rollers 1, 1', which rollers 1, l' are rotatably mounted horizontally and parallel to one another in a frame. Here, one of the two rollers 1 is generally fixed in the radial direction and another of the two rollers l' is pressed onto the fixed roller 1 by means of a spring system. Each roller 1, 1' has a grinding surface. The opposite grinding surfaces of the rollers 1, l' form a wedge. Material is filled from above between the rollers 1, 1' into the wedge, guided downward as a result of the rotation of the rollers 1, 1' and comminuted through the wedge. The rotation of the rollers 1, l' is achieved by means of a drive. In the case of known drives for roller mills, an electric motor is indirectly connected via movable mechanical elements to one of the rollers or to both rollers.
2 Figure 2 shows a roller mill having two drives. One drive is assigned to each of the rollers 1, 1' and comprises an electric motor 2, a cardan shaft 3 and a planetary gear mechanism 4. The radially displaceable roller 1' is connected to the positionally fixed electric motor 2 via the cardan shaft 3. Optionally, it is also possible for the cardan shaft to be directly connected to the shaft of the displaceable roller and for the planetary gear mechanism to be arranged between the cardan shaft and the electric motor. In such an arrangement, as described, for example, in DE 10211000749 Al, the electric motor and the planetary gear mechanism are positionally fixed.
Optionally, it is also possible to use one motor and one gear mechanism to drive both rollers. In this case, the gear mechanism distributes the torque between both rollers. Optionally, it is also possible for the electric motor to deliver the desired rotational speed for the rollers without rotational speed adaptation of a gear mechanism. In this case, the drive comprises no gear mechanism and the electric motor is directly connected to the roller via the cardan shaft.
Figure 3 shows two rollers having one drive each.
Displacement of the displaceable roller 1' results in the shaft of the positionally fixed electric motor 2 and the shaft of the displaceable roller 1' no longer being aligned. The radial displacement between the shafts is compensated for by movements in joints 31 of the cardan shaft 3. Since the displaceable shaft 1' is displaced substantially orthogonally to the axial direction, the distance between the joints 31 of the cardan shaft 3 increases. The necessary adaptation of the length of the cardan shaft 3 is achieved by means of a telescopic mechanism 32.
Figure 4 shows a cardan shaft having a telescopic mechanism. Here, the cardan shaft 3 has, between the joints 31, a rectilinear spur toothing 32 which is
Optionally, it is also possible to use one motor and one gear mechanism to drive both rollers. In this case, the gear mechanism distributes the torque between both rollers. Optionally, it is also possible for the electric motor to deliver the desired rotational speed for the rollers without rotational speed adaptation of a gear mechanism. In this case, the drive comprises no gear mechanism and the electric motor is directly connected to the roller via the cardan shaft.
Figure 3 shows two rollers having one drive each.
Displacement of the displaceable roller 1' results in the shaft of the positionally fixed electric motor 2 and the shaft of the displaceable roller 1' no longer being aligned. The radial displacement between the shafts is compensated for by movements in joints 31 of the cardan shaft 3. Since the displaceable shaft 1' is displaced substantially orthogonally to the axial direction, the distance between the joints 31 of the cardan shaft 3 increases. The necessary adaptation of the length of the cardan shaft 3 is achieved by means of a telescopic mechanism 32.
Figure 4 shows a cardan shaft having a telescopic mechanism. Here, the cardan shaft 3 has, between the joints 31, a rectilinear spur toothing 32 which is
3 displaceable in the axial direction of the cardan shaft 3.
This makes it possible for the cardan shaft 3 to have a variable length and be able to transmit a torque. A
problem with this solution is that a cardan shaft having a telescopic mechanism is very expensive and maintenance-intensive. The sliding surfaces of the toothing must always be lubricated. On account of the very dirty and dusty working environment, which working environment is caused by the grinding process, very frequent maintenance, such as, for example, in a weekly cycle, is necessary.
Otherwise, there is insufficient lubricant present on the toothing and there occurs massive abrasion and wear through friction in the region of the toothing. However, even with sufficient maintenance, cardan shafts having telescopic mechanisms in this arrangement in roller mills prove to be susceptible to faults owing to notch effects and the axial movement in a confined space and often lead to the failure of the mill.
Figure 5 shows a displaceable roller 1' with an associated drive. The displaceable roller 1' has a radial bearing arrangement 11 and an axial bearing arrangement 12.
Alternatively, it is also possible for one of the radial bearings to be put together with the axial bearing in a combined axial-radial bearing. An electric motor 2 has a rotor 21 and a stator 22. The rotor is mounted by means of a radial bearing arrangement 23 and an axial bearing arrangement 24. A cardan shaft 3 connects the displaceable shaft 1' to the rotor 21 of the electric motor 2. The necessary adaptation of the length of the cardan shaft 3 during a displacement of the displaceable shaft l' is achieved by means of a telescopic mechanism 32.
SUMMARY OF THE INVENTION
The object of the present invention is to make available a roller mill and an assembly for driving a roller mill
This makes it possible for the cardan shaft 3 to have a variable length and be able to transmit a torque. A
problem with this solution is that a cardan shaft having a telescopic mechanism is very expensive and maintenance-intensive. The sliding surfaces of the toothing must always be lubricated. On account of the very dirty and dusty working environment, which working environment is caused by the grinding process, very frequent maintenance, such as, for example, in a weekly cycle, is necessary.
Otherwise, there is insufficient lubricant present on the toothing and there occurs massive abrasion and wear through friction in the region of the toothing. However, even with sufficient maintenance, cardan shafts having telescopic mechanisms in this arrangement in roller mills prove to be susceptible to faults owing to notch effects and the axial movement in a confined space and often lead to the failure of the mill.
Figure 5 shows a displaceable roller 1' with an associated drive. The displaceable roller 1' has a radial bearing arrangement 11 and an axial bearing arrangement 12.
Alternatively, it is also possible for one of the radial bearings to be put together with the axial bearing in a combined axial-radial bearing. An electric motor 2 has a rotor 21 and a stator 22. The rotor is mounted by means of a radial bearing arrangement 23 and an axial bearing arrangement 24. A cardan shaft 3 connects the displaceable shaft 1' to the rotor 21 of the electric motor 2. The necessary adaptation of the length of the cardan shaft 3 during a displacement of the displaceable shaft l' is achieved by means of a telescopic mechanism 32.
SUMMARY OF THE INVENTION
The object of the present invention is to make available a roller mill and an assembly for driving a roller mill
4 which are less maintenance-intensive and less susceptible to faults.
This object is achieved by a roller mill and an assembly for driving a roller mill having the features of the independent patent claims. Preferred embodiments form the subject of the dependent patent claims.
The subject of the invention is that a displaceable roller of a roller mill is connected via a cardan shaft of nonvariable length to an electric motor. The displaceable roller is mounted in the axial and radial direction. The electric motor has a rotor which is displaceable in the axial direction. This floating mounting of the rotor of the electric motor makes it possible to compensate for the change in the distance between the positionally fixed stator of the electric motor and the displaceable shaft owing to displacements of the displaceable shaft orthogonally to the axial direction of the displaceable shaft without the use of a telescopic mechanism and using a cardan shaft with a constant length. This allows a simpler construction with a lower maintenance requirement and a lower susceptibility to faults.
BRIEF DESCRIPTION OF THE FIGURES
The invention will be explained in more detail below with reference to exemplary embodiments in conjunction with the figures, in which:
figure I shows a schematic illustration of the grinding process of a roller mill according to the prior art;
figure 2 shows a perspective illustration of a roller mill having two drives according to the prior art;
figure 3 shows two rollers with one drive each according to the prior art in a plan view;
figure 4 shows a cardan shaft with a telescopic mechanism according to the prior art in a plan view;
figure 5 shows a schematic illustration of an axial section through a displaceable roller with a drive according to the prior art; and figure 6 shows a schematic illustration of an axial section through a displaceable roller with a drive according to the invention.
The reference signs used in the drawings are summarized in the list of reference signs. In principle, identical parts are provided with the same reference signs.
WAYS OF IMPLEMENTING THE INVENTION
Figure 6 shows a displaceable roller with a drive according to the invention. The displaceable roller 1' has a radial bearing arrangement 11 and an axial bearing arrangement 12. An electric motor 2 has a rotor 21 and a stator 22. The rotor 21 is guided via a radial bearing arrangement 23 in such a way that the rotor 21 is displaceable in the axial direction. A cardan shaft having a fixed length during operation of the roller mill connects the displaceable shaft to the electric motor 2.
Optionally, it is possible for the axial bearing arrangement of the drive to be arranged on the cardan shaft or the rotor instead of on the displaceable roller.
Optionally, it is possible for the drive to have a gear mechanism, such as, for example, a planetary gear mechanism, in which case the gear mechanism is arranged between the cardan shaft and the displaceable roller. The gear mechanism is mounted such that no movement occurs relatively between the gear mechanism and the displaceable roller and the gear mechanism experiences the same movements orthogonally to the axial direction of the displaceable roller as the displaceable roller itself.
Optionally, it is possible that the cardan shaft has, outside of the operation of the roller mill, an adjustable length, for example in the form of a telescopic mechanism with a locking screw.
LIST OF REFERENCE SIGNS
1,1' Roller 11 Radial bearing of the roller 12 Axial bearing of the roller 2 Electric motor 21 Rotor 22 Stator 23 Radial bearing of the rotor 24 Axial bearing of the rotor 3 Cardan shaft 31 Joint 32 Spur toothing 4 Planetary gear mechanism
This object is achieved by a roller mill and an assembly for driving a roller mill having the features of the independent patent claims. Preferred embodiments form the subject of the dependent patent claims.
The subject of the invention is that a displaceable roller of a roller mill is connected via a cardan shaft of nonvariable length to an electric motor. The displaceable roller is mounted in the axial and radial direction. The electric motor has a rotor which is displaceable in the axial direction. This floating mounting of the rotor of the electric motor makes it possible to compensate for the change in the distance between the positionally fixed stator of the electric motor and the displaceable shaft owing to displacements of the displaceable shaft orthogonally to the axial direction of the displaceable shaft without the use of a telescopic mechanism and using a cardan shaft with a constant length. This allows a simpler construction with a lower maintenance requirement and a lower susceptibility to faults.
BRIEF DESCRIPTION OF THE FIGURES
The invention will be explained in more detail below with reference to exemplary embodiments in conjunction with the figures, in which:
figure I shows a schematic illustration of the grinding process of a roller mill according to the prior art;
figure 2 shows a perspective illustration of a roller mill having two drives according to the prior art;
figure 3 shows two rollers with one drive each according to the prior art in a plan view;
figure 4 shows a cardan shaft with a telescopic mechanism according to the prior art in a plan view;
figure 5 shows a schematic illustration of an axial section through a displaceable roller with a drive according to the prior art; and figure 6 shows a schematic illustration of an axial section through a displaceable roller with a drive according to the invention.
The reference signs used in the drawings are summarized in the list of reference signs. In principle, identical parts are provided with the same reference signs.
WAYS OF IMPLEMENTING THE INVENTION
Figure 6 shows a displaceable roller with a drive according to the invention. The displaceable roller 1' has a radial bearing arrangement 11 and an axial bearing arrangement 12. An electric motor 2 has a rotor 21 and a stator 22. The rotor 21 is guided via a radial bearing arrangement 23 in such a way that the rotor 21 is displaceable in the axial direction. A cardan shaft having a fixed length during operation of the roller mill connects the displaceable shaft to the electric motor 2.
Optionally, it is possible for the axial bearing arrangement of the drive to be arranged on the cardan shaft or the rotor instead of on the displaceable roller.
Optionally, it is possible for the drive to have a gear mechanism, such as, for example, a planetary gear mechanism, in which case the gear mechanism is arranged between the cardan shaft and the displaceable roller. The gear mechanism is mounted such that no movement occurs relatively between the gear mechanism and the displaceable roller and the gear mechanism experiences the same movements orthogonally to the axial direction of the displaceable roller as the displaceable roller itself.
Optionally, it is possible that the cardan shaft has, outside of the operation of the roller mill, an adjustable length, for example in the form of a telescopic mechanism with a locking screw.
LIST OF REFERENCE SIGNS
1,1' Roller 11 Radial bearing of the roller 12 Axial bearing of the roller 2 Electric motor 21 Rotor 22 Stator 23 Radial bearing of the rotor 24 Axial bearing of the rotor 3 Cardan shaft 31 Joint 32 Spur toothing 4 Planetary gear mechanism
Claims (6)
1. A roller mill comprising two contrarotating rollers (1, 1') which are arranged in parallel and pressed against one another, wherein one of the rollers (1') is displaceable orthogonally to the axial direction of this roller (1'), and wherein the displaceable roller (1') is mounted in the axial and radial direction and comprises a drive, which drive comprises an electric motor (2) and a cardan shaft (3), wherein the electric motor (2) comprises a rotor (21) and a positionally fixed stator (22), and wherein the cardan shaft (3) is arranged between the rotor (21) and the displaceable roller (1') in such a way that the cardan shaft (3) can transmit a rotary movement of the rotor (21) to the displaceable roller (1'), characterized in that the rotor (21) is mounted so as to be displaceable in the axial direction, and in that the cardan shaft (3) has a length which is nonvariable during operation of the roller mill.
2. The roller mill as claimed in claim 1, characterized in that the roller mill comprises a gear mechanism (4), which gear mechanism (4) is arranged between the displaceable roller (1') and the cardan shaft (3) and is mounted so as to be displaceable orthogonally to the axial direction of the displaceable roller (1') in such a way that the gear mechanism (3) is positionally fixed relative to the displaceable roller (1').
3. The roller mill as claimed in claim 2, characterized in that the gear mechanism (4) is a planetary gear mechanism.
4. The roller mill as claimed in one of claims 1 to 3, characterized in that the radial bearing arrangement (23) of the rotor (21) has two sliding bearings.
5. An assembly for driving a roller mill having a displaceable roller (1'), which displaceable roller (1') is displaceable orthogonally to the axial direction of the displaceable roller (1'), wherein the assembly comprises an electric motor (2) and a cardan shaft (3), wherein the electric motor (2) comprises a rotor (21) and a positionally fixed stator (22), and wherein the cardan shaft (3) can be arranged between the rotor (21) and the displaceable roller (1') in such a way that the cardan shaft (3) can transmit a rotary movement of the rotor (21) to the displaceable roller (1'), characterized in that the rotor (21) is mounted so as to be displaceable in the axial direction, and the cardan shaft (3) has a nonvariable length.
6. The assembly as claimed in one of claims 5, characterized in that the radial bearing arrangement (23) of the rotor (21) has two sliding bearings.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP13197004.8A EP2883612A1 (en) | 2013-12-12 | 2013-12-12 | Rolling mill and assembly for driving a rolling mill |
| EP13197004.8 | 2013-12-12 | ||
| PCT/EP2014/076815 WO2015086486A1 (en) | 2013-12-12 | 2014-12-08 | Roller mill and arrangement for driving a roller mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2932845A1 true CA2932845A1 (en) | 2015-06-18 |
Family
ID=49753091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2932845A Abandoned CA2932845A1 (en) | 2013-12-12 | 2014-12-08 | Roller mill and assembly for driving a roller mill |
Country Status (6)
| Country | Link |
|---|---|
| EP (2) | EP2883612A1 (en) |
| AU (1) | AU2014363719B2 (en) |
| CA (1) | CA2932845A1 (en) |
| CL (1) | CL2016001356A1 (en) |
| PE (1) | PE20161460A1 (en) |
| WO (1) | WO2015086486A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3401017B1 (en) * | 2017-05-09 | 2019-08-28 | Bühler AG | Feed and foodstuff roller mill with a transmission |
| EP3700942A1 (en) | 2017-10-25 | 2020-09-02 | Basf Se | Process for producing hydrophobically associating polyacrylamides |
| WO2020079123A1 (en) | 2018-10-18 | 2020-04-23 | Basf Se | Method of fracturing subterranean formations using aqueous solutions comprising hydrophobically associating copolymers |
| CN109289980A (en) * | 2018-11-16 | 2019-02-01 | 南通亚威机械制造有限公司 | A kind of cement roller press |
| WO2021037578A1 (en) | 2019-08-26 | 2021-03-04 | Basf Se | Process for making nvp containing polyacrylamides |
| WO2021037579A1 (en) | 2019-08-26 | 2021-03-04 | Basf Se | Process for making nvp containing polyacrylamides |
| WO2022106308A1 (en) | 2020-11-23 | 2022-05-27 | Basf Se | Process for making water-soluble, nvp-containing copolymers in powder form |
| CN112808383B (en) * | 2021-01-04 | 2023-03-10 | 中冶长天国际工程有限责任公司 | Crusher and crushing roller adjusting device and crushing roller adjusting method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2250585A1 (en) * | 1972-10-11 | 1974-05-02 | Mannesmann Meer Ag | DRIVE OF TWO ROLLERS WITH CHANGEABLE AXIS DISTANCE |
| DD134921A1 (en) * | 1978-03-13 | 1979-04-04 | Bernd Pester | DRIVE FOR ROLLING MILLS |
| DE4028015A1 (en) | 1990-09-04 | 1992-03-05 | Krupp Polysius Ag | Roller mill for grinding brittle material - has powder fed into gap between rollers to prevent clogging |
| DE19822341B4 (en) * | 1998-05-19 | 2007-10-18 | Gebr. Eickhoff Maschinenfabrik U. Eisengiesserei Mbh | Drive device for two counter-rotating rollers |
| DE102011000749A1 (en) | 2011-02-15 | 2012-08-16 | Thyssenkrupp Polysius Ag | Roller mill for crushing brittle materials e.g. limestone, has spur gear and motor that are coupled with grinding rollers through drive shaft |
| EP2545994A1 (en) * | 2011-07-15 | 2013-01-16 | ABB Technology AG | Arrangement for a roller mill |
-
2013
- 2013-12-12 EP EP13197004.8A patent/EP2883612A1/en not_active Withdrawn
-
2014
- 2014-12-08 CA CA2932845A patent/CA2932845A1/en not_active Abandoned
- 2014-12-08 WO PCT/EP2014/076815 patent/WO2015086486A1/en active Application Filing
- 2014-12-08 PE PE2016000718A patent/PE20161460A1/en unknown
- 2014-12-08 AU AU2014363719A patent/AU2014363719B2/en not_active Ceased
- 2014-12-08 EP EP14809005.3A patent/EP3079825A1/en not_active Withdrawn
-
2016
- 2016-06-03 CL CL2016001356A patent/CL2016001356A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| PE20161460A1 (en) | 2017-02-03 |
| EP2883612A1 (en) | 2015-06-17 |
| AU2014363719A1 (en) | 2016-07-21 |
| AU2014363719B2 (en) | 2018-02-01 |
| EP3079825A1 (en) | 2016-10-19 |
| CL2016001356A1 (en) | 2016-11-25 |
| WO2015086486A1 (en) | 2015-06-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20191022 |
|
| FZDE | Discontinued |
Effective date: 20220513 |
|
| FZDE | Discontinued |
Effective date: 20220513 |