EP2942105A1 - Walzenmühle und Verfahren zur Steuerung einer Walzenmühle - Google Patents

Walzenmühle und Verfahren zur Steuerung einer Walzenmühle Download PDF

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Publication number
EP2942105A1
EP2942105A1 EP14167575.1A EP14167575A EP2942105A1 EP 2942105 A1 EP2942105 A1 EP 2942105A1 EP 14167575 A EP14167575 A EP 14167575A EP 2942105 A1 EP2942105 A1 EP 2942105A1
Authority
EP
European Patent Office
Prior art keywords
rollers
electric motor
roller
value
master
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.)
Withdrawn
Application number
EP14167575.1A
Other languages
German (de)
English (en)
French (fr)
Inventor
Martin Pischtschan
Hans-Ulrich Hirt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Technology AG
Original Assignee
ABB Technology AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ABB Technology AG filed Critical ABB Technology AG
Priority to EP14167575.1A priority Critical patent/EP2942105A1/de
Priority to PE2016002183A priority patent/PE20161555A1/es
Priority to EP15720343.1A priority patent/EP3140041B1/de
Priority to CA2948074A priority patent/CA2948074C/en
Priority to DK15720343.1T priority patent/DK3140041T3/en
Priority to PCT/EP2015/060196 priority patent/WO2015169950A1/de
Priority to AU2015257657A priority patent/AU2015257657B2/en
Publication of EP2942105A1 publication Critical patent/EP2942105A1/de
Priority to CL2016002734A priority patent/CL2016002734A1/es
Priority to US15/346,296 priority patent/US10946386B2/en
Priority to ZA2016/07692A priority patent/ZA201607692B/en
Withdrawn legal-status Critical Current

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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
    • B02C4/28—Details
    • B02C4/42—Driving mechanisms; Roller speed control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C25/00—Control arrangements specially adapted for crushing or disintegrating
    • 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

Definitions

  • the present invention relates to the field of roll mills. It relates to a roller mill with two counter-rotating rollers which are rotatably mounted in a frame, and method for controlling such a roller mill.
  • Roll mills are used for grinding materials, in particular ores and cement. Roll mills typically have a roll diameter of 0.8 to 3 meters and a drive power of 0.2 to 5 megawatts. They are particularly energy efficient compared to other mill types. Such a roller mill is used for example in DE 4028015 A1 described.
  • a roller mill comprises two counter-rotating rollers 1,1 ', which rollers 1,1' are mounted horizontally and parallel to each other in a frame rotatably.
  • One of the two rollers 1 ' is orthogonal to the axial direction of this roller 1' displaced.
  • the other of the two rollers 1 is not orthogonally displaceable.
  • the displaceable roller 1 ' is pressed by a spring system onto the fixed roller 1.
  • Each roller 1,1 ' has a grinding surface.
  • the opposite grinding surfaces of the rollers 1,1 ' form a wedge. Material is filled from above between the rollers 1,1 'in the wedge, guided by the rotation of the rollers 1,1' down and crushed by the wedge.
  • the rotation of the rollers 1,1 ' via a drive.
  • Known drives for roll mills usually have two Electric motors, wherein each one electric motor of the rollers is connected.
  • Fig. 2 shows a roller mill with two drives.
  • a drive is assigned to one of the rollers 1,1 'and includes an electric motor 2, a propeller shaft 3 and a planetary gear 4.
  • the articulation shaft is connected directly to the shaft of the displaceable roller and the planetary gear is arranged between the articulated shaft and the electric motor.
  • the electric motor and the planetary gear are stationary.
  • the electric motor delivers the desired speed for the rollers without a speed adjustment of a transmission.
  • the drive does not comprise a gearbox and the electric motor is connected directly to the roller via the cardan shaft.
  • a direct drive is arranged on the roller itself.
  • the drive does not comprise a cardan shaft.
  • the electric motors of the two drives are usually controlled by two separate frequency converter.
  • the control strategy for the electric motors has an influence on the wear of the rollers.
  • the wear of the rollers is influenced, among other things, by the contact pressure of the rollers, the circumferential speed of the grinding surfaces of the individual rollers and the difference between the peripheral speeds of the grinding surfaces of the rollers.
  • the wear of the two rolls is usually different strength. It can have both the displaceable roller and the stationary roller 1 a greater wear.
  • both drives try to set the same speed for the motors they control, but act independently to achieve that goal.
  • the problem is that even with identical frequency converters, the speed controls have a fault so that an identical speed of the two rolls can not be achieved in this way and so result in a difference in the peripheral speeds of the grinding surfaces of the two rolls.
  • the diameter of the roller is not considered. With different roll diameters, such as increased wear on one of the two rolls, even at an identical rotational speed of the two rolls leads to different peripheral speeds of the grinding surfaces of the rolls. Another consequence of this is that the load between the two rolls is not evenly distributed, resulting in relative rotation of the two rolls, which in turn leads to increased wear.
  • Fig. 3a shows a schematic representation of the signal flow of a roll mill with this control strategy in an initial phase. Both frequency converters 5 are given an identical speed reference 61 as in the first one Steuerungsstratgie.
  • Fig. 3b shows a schematic representation of the signal flow of a roll mill with this control strategy in a production phase.
  • the frequency converter 5 of the follower After reaching a defined load threshold, the frequency converter 5 of the follower is no longer given the identical speed reference 61 but actual torque value 62 of the masters. This allows a better uniform distribution of the loads on the two rolls and a reduction in the peripheral speed difference of the grinding surfaces of the rolls and thus leads to a reduction of the individual wear of the rolls.
  • the master follower strategy can use the actual speed (speed follower) value of the master as the reference for the followers in the production phase, rather than the actual torque value (torque follower).
  • both frequency inverters 94 are given an identical speed reference and after switching to the production phase, the follower is given the actual value of the speed of the masters.
  • the problem with the master follower strategy is that wear can only be optimized individually for each roller in terms of service life. It is not possible to optimize the wear of both rolls in the overall system of the roll mill so as to maximize the life of the roll mill.
  • Object of the present invention is to provide a roller mill, which has an increased life.
  • Fig. 4 shows a schematic representation of the signal flow in a roll mill according to the invention.
  • the controller provides a speed controller of the frequency converter 5 of the master electric motor 2 before a target value 61 for the speed.
  • the resulting by the regulation of the speed for the master electric motor 2 actual value 62 of the rotational speed is in one Multiplier 65 multiplied by a load distribution factor 64.
  • the resulting value is given as a setpoint for the speed controller frequency converter 5 for the follower electric motor 2 '.
  • a controller 66 is shown, which controller may be a PID controller, for example, to ensure a closed regulator circuit.
  • the output of the PID controller is added or subtracted from the original speed reference 61, and then passed to the frequency converter of the follower electric motor 2 'as the setpoint.
  • the load distribution factor By the load distribution factor, the wear of the individual rollers can be influenced relative to each other.
  • Fig. 5 shows an exemplary relationship between the wear of the rollers and the choice of the load distribution factor.
  • the wear 112 of the respective roll is shown in the form of reduction of the roll diameter over the rotational work already performed by the respective roll.
  • the curves 113, 114 adjust the wear of two rolls of a pair of rolls as a function of the turning work there.
  • the curve 114 shows a greater wear of the corresponding roller than the wear of the roller which is shown in the curve 113.
  • the load factor is now chosen so that the roller with the accumulated greater previous wear carries a smaller part of the load required for the meal.
  • the load distribution factor may be a positive real number including zero.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Control Of Multiple Motors (AREA)
EP14167575.1A 2014-05-08 2014-05-08 Walzenmühle und Verfahren zur Steuerung einer Walzenmühle Withdrawn EP2942105A1 (de)

Priority Applications (10)

Application Number Priority Date Filing Date Title
EP14167575.1A EP2942105A1 (de) 2014-05-08 2014-05-08 Walzenmühle und Verfahren zur Steuerung einer Walzenmühle
PCT/EP2015/060196 WO2015169950A1 (de) 2014-05-08 2015-05-08 Walzenmühle und verfahren zur steuerung einer walzenmühle
EP15720343.1A EP3140041B1 (de) 2014-05-08 2015-05-08 Walzenmühle und verfahren zur steuerung einer walzenmühle
CA2948074A CA2948074C (en) 2014-05-08 2015-05-08 Roller mill and method for controlling a roller mill
DK15720343.1T DK3140041T3 (en) 2014-05-08 2015-05-08 Rolling mill and method for controlling a rolling mill
PE2016002183A PE20161555A1 (es) 2014-05-08 2015-05-08 Molino de rodillos y metodo para controlar un molino de rodillos
AU2015257657A AU2015257657B2 (en) 2014-05-08 2015-05-08 Roller mill and method for controlling a roller mill
CL2016002734A CL2016002734A1 (es) 2014-05-08 2016-10-27 Molino de rodillos y método para controlar un molino de rodillos
US15/346,296 US10946386B2 (en) 2014-05-08 2016-11-08 Roller mill and method for controlling a roller mill
ZA2016/07692A ZA201607692B (en) 2014-05-08 2016-11-08 Roller mill and method for controlling a roller mill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14167575.1A EP2942105A1 (de) 2014-05-08 2014-05-08 Walzenmühle und Verfahren zur Steuerung einer Walzenmühle

Publications (1)

Publication Number Publication Date
EP2942105A1 true EP2942105A1 (de) 2015-11-11

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP14167575.1A Withdrawn EP2942105A1 (de) 2014-05-08 2014-05-08 Walzenmühle und Verfahren zur Steuerung einer Walzenmühle
EP15720343.1A Active EP3140041B1 (de) 2014-05-08 2015-05-08 Walzenmühle und verfahren zur steuerung einer walzenmühle

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP15720343.1A Active EP3140041B1 (de) 2014-05-08 2015-05-08 Walzenmühle und verfahren zur steuerung einer walzenmühle

Country Status (9)

Country Link
US (1) US10946386B2 (es)
EP (2) EP2942105A1 (es)
AU (1) AU2015257657B2 (es)
CA (1) CA2948074C (es)
CL (1) CL2016002734A1 (es)
DK (1) DK3140041T3 (es)
PE (1) PE20161555A1 (es)
WO (1) WO2015169950A1 (es)
ZA (1) ZA201607692B (es)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106824387A (zh) * 2017-01-24 2017-06-13 徐州市诚信破碎机械厂 一种液压复合式破碎机
CN109289980A (zh) * 2018-11-16 2019-02-01 南通亚威机械制造有限公司 一种水泥辊压机
CN110465394A (zh) * 2019-08-19 2019-11-19 徐州汉兴再生资源有限公司 一种用于可回收建筑垃圾的粉碎装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11020749B2 (en) * 2018-09-30 2021-06-01 Northeastern University Servo control device and method for disc gap in disc powder grinding system
CN110653047A (zh) * 2019-11-05 2020-01-07 攀钢集团西昌钢钒有限公司 一种切焦机保护方法及装置
GB2601548A (en) * 2020-12-04 2022-06-08 Weir Minerals Netherlands Bv Roller controller
CN115007303B (zh) * 2022-06-21 2023-10-20 合肥水泥研究设计院有限公司 辊压机预粉磨系统的预测控制方法及存储介质
EP4542845A1 (en) * 2023-10-17 2025-04-23 Abb Schweiz Ag Method and computer program for operating a drive arrangement, drive arrangement, motor arrangement, and computer readable medium

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4028015A1 (de) 1990-09-04 1992-03-05 Krupp Polysius Ag Verbesserung des einzugsverhaltens einer walzenmuehle
DE102011000749A1 (de) 2011-02-15 2012-08-16 Thyssenkrupp Polysius Ag Walzenmühle

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
US20060288827A1 (en) * 2005-04-28 2006-12-28 Mitsubishi Heavy Industrial, Ltd. Method and device for cutting off band-like paper member and controller of the device
US8833217B2 (en) * 2007-06-15 2014-09-16 The Bradbury Company, Inc. Methods and systems to drive rotary presses
US8807468B2 (en) * 2011-01-08 2014-08-19 Ssi Shredding Systems, Inc. Controlled feed-rate shredding
JP2016532561A (ja) * 2013-08-09 2016-10-20 エクストゥルーテック・リミテッド 粉体圧縮方法およびローラ型圧縮装置
GB201315451D0 (en) * 2013-08-30 2013-10-16 Mmd Design & Consult Mineral breaker

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4028015A1 (de) 1990-09-04 1992-03-05 Krupp Polysius Ag Verbesserung des einzugsverhaltens einer walzenmuehle
DE102011000749A1 (de) 2011-02-15 2012-08-16 Thyssenkrupp Polysius Ag Walzenmühle

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
BRENT JONES: "VFD control methodologies in High Pressure Grinding drive systems", CEMENT INDUSTRY TECHNICAL CONFERENCE, 2012
BRENT JONES: "VFD control methodologies in High Pressure Grinding drive systems", CEMENT INDUSTRY TECHNICAL CONFERENCE, 2012, XP002729796 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106824387A (zh) * 2017-01-24 2017-06-13 徐州市诚信破碎机械厂 一种液压复合式破碎机
CN106824387B (zh) * 2017-01-24 2019-12-24 徐州市诚信破碎机械厂 一种液压复合式破碎机
CN109289980A (zh) * 2018-11-16 2019-02-01 南通亚威机械制造有限公司 一种水泥辊压机
CN110465394A (zh) * 2019-08-19 2019-11-19 徐州汉兴再生资源有限公司 一种用于可回收建筑垃圾的粉碎装置

Also Published As

Publication number Publication date
CA2948074A1 (en) 2015-11-12
CL2016002734A1 (es) 2017-07-07
ZA201607692B (en) 2018-04-25
CA2948074C (en) 2022-06-21
US20170050188A1 (en) 2017-02-23
AU2015257657B2 (en) 2019-01-17
EP3140041A1 (de) 2017-03-15
DK3140041T3 (en) 2018-07-16
AU2015257657A1 (en) 2016-12-01
PE20161555A1 (es) 2017-01-14
EP3140041B1 (de) 2018-04-18
WO2015169950A1 (de) 2015-11-12
US10946386B2 (en) 2021-03-16

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