EP3140041A1 - Broyeur à cylindres et procédé de commande d'un broyeur à cylindres - Google Patents

Broyeur à cylindres et procédé de commande d'un broyeur à cylindres

Info

Publication number
EP3140041A1
EP3140041A1 EP15720343.1A EP15720343A EP3140041A1 EP 3140041 A1 EP3140041 A1 EP 3140041A1 EP 15720343 A EP15720343 A EP 15720343A EP 3140041 A1 EP3140041 A1 EP 3140041A1
Authority
EP
European Patent Office
Prior art keywords
electric motor
rollers
roller
master
value
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.)
Granted
Application number
EP15720343.1A
Other languages
German (de)
English (en)
Other versions
EP3140041B1 (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 Schweiz AG
Original Assignee
ABB Schweiz 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 Schweiz AG filed Critical ABB Schweiz AG
Publication of EP3140041A1 publication Critical patent/EP3140041A1/fr
Application granted granted Critical
Publication of EP3140041B1 publication Critical patent/EP3140041B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • B02C4/28—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 in Be ⁇ drive counter-rotating rollers, which are rotatably mounted in a frame, and a method for controlling such a roller mill.
  • Roller mills are used for grinding materials, in particular ores and cement. Roller mills have ty ⁇ pisch enough, a roller diameter of 0.8 to 3 meters and a driving power of 0.2 to 5 MW. They are particularly energy efficient compared to other mill types. Such a roller mill is described for example in DE 4028015 AI.
  • Fig. 1 shows a schematic representation of a radial section of a roll mill of the prior art.
  • the roller mill comprises two counter-rotating rollers 1,1 ', which rollers 1,1' horizontally and parallel to each other in a frame (not shown) are rotatably mounted.
  • One of the two rollers 1 is displaceable orthogonal to the axial direction of this roller 1.
  • the other of the two rollers 1 ' is not orthogonally displaceable.
  • the displaceable roller 1 is pressed by a spring system (not shown) on 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 through the wedge and the associated pressure on the material crushed.
  • the rotation of the rollers 1,1 ' via a drive (not shown).
  • Known drives for roller mills usually have two Elect ⁇ romotoren, with one electric motor with a whale of zen is connected to and drives.
  • Fig. 2 shows a roller mill with two drives from the prior art. Depending on a drive is assigned to one of the rollers 1,1 'and each comprises an electric motor 2,2', a Ge ⁇ steering shaft 3 and a planetary gear 4. The connection of the radially displaceable roller 1 with the stationary Elektromo ⁇ tor 2 via the propeller shaft third
  • the joint shaft is connected directly to the shaft of the displaceable roller and the planetary gear is arranged between the joint shaft and the electric motor.
  • the joint shaft is connected directly to the shaft of the displaceable roller and the planetary gear is arranged between the joint shaft and the electric motor.
  • an electric motor without a speed adjustment of overall drive directly the desired speed for the rolls lie ⁇ fert, for example, by controlling the electric motor by means of a frequency converter.
  • the drive does not comprise a gearbox and the electric motor is connected directly to the roller via the cardan shaft.
  • the electric motors of the two rollers are usually controlled by two separate frequency converters.
  • a direct drive is arranged on the roller itself. In this case, the drive does not comprise a cardan shaft.
  • the control strategies for the drives have an influence on the wear of the rollers.
  • the wear of the rolls is influenced, among other things, by the contact pressure of the rolls, the circumferential speed of the grinding surfaces of the individual rolls and the difference between the peripheral speeds of the grinding surfaces of the rolls.
  • the wear of the two rolls is usually different strong. It can be both the displaceable roller and the fixed roller ⁇ properties have a greater wear.
  • STEU ⁇ tion strategies from the article "VFD control methodologies in High Pressure Grinding drive Systems" (Brent Jones, Cement Industry Technical Conference, 2012 IEEE-IAS / PCA 53) known.
  • the control of the two motors is given an identical reference value for the speed as a reference.
  • both drives try to set the same speed for the motor they control, but act independently of each other 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 thus results 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 roller diameters, such as increased wear on one of the two rollers, even an identical speed of the two rollers leads to different peripheral speeds of the grinding surfaces of the rollers. 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.
  • the control of the two motors is an identical setpoint for the torque pre ⁇ give.
  • the problem is that in case that the drive torque is greater than the load torque, accelerate the roll mill or delayed in the opposite case. This results in a changing Drehgeschwin ⁇ speed of the roll mill proportional to variations of the ground material, which is also disadvantageous for the operation of the roll mill.
  • Fig. 3 shows a schematic illustration of the signal flow at a rolling mill with this third control Strate ⁇ energy from the prior art in an initial phase.
  • an identical setpoint value for the speed 61 is given as reference to both frequency inverters 5, 5 '. Both frequency converters 5, 5 'are regulated with respect to the rotational speed.
  • FIG. 4 shows a schematic representation of the signal flow in the roller mill from FIG. 3 in a production phase.
  • one of the frequency inverters 5 '(follower) is no longer set as the reference for the speed 61 but an actual value of a torque 62 of the electric motor 2 (master) connected to the other frequency converter 5.
  • the frequency converter 5 'of the Follo- who electric motor 2' is thereby no longer related.
  • ⁇ the rotational speed but related. Of torque controlled.
  • the ⁇ for F mrichter 5 of the master electric motor 2 is speed-controlled in the production phase. This allows a better uniform distribution of the loads on the two rolls and a reduction in the difference between the two peripheral speeds of the grinding surfaces of the rolls and thus leads to a reduction in the different wear of the rolls.
  • the assignment of master and follower to the displaceable or the fixed roller is arbitrary.
  • the actual value of the torque of the master electric motor 2 (torque follower)
  • the actual value of a rotational speed of the master electric motor 2 (speed follower) can also be used as reference for the control of the folloWing electric motor 2 'used in the production phase who ⁇ .
  • both frequency converters 5, 5 'in the initial phase an identical setpoint torque is specified as a reference and after switching to the production phase the frequency converter 5' of the follower Ele- rom- 2 'the actual value of the speed of the master Elektromo - sector 2 is given as a reference.
  • the problem with the master-follower strategy is that wear can only be optimized individually for each roller with regard to its 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.
  • roller mills In a roller mill with two rollers arranged in parallel and pressed against each other and rotating in opposite directions and two electric motors, one motor is connected to one roller and drives the respective roller during operation.
  • One of the rollers is displaceable orthogonal to the axial direction of this roller.
  • Roll mills are also referred to as roller presses, high-bed grinding mills or in English as High Pressure Grinding Rolls.
  • the two electric motors each have a controller, which control allows the setting of certain operating parameters in the respective electric motor. In extreme cases, the control of one of the electric motors can be simplified as a direct connection to an electrical supply network if the other of the electric motors can be controlled independently of the electrical supply network.
  • the operating parameters of the directly connected electric motor set according to the parameters of the electrical supply network, such as the frequency and the voltage. Due to the condition of the independent controllability of the other electric motor in this extreme case, despite the dependence on the generally constant, electrical supply network of directly connected motor relative control of Moto ⁇ Ren each other possible.
  • One of the electric motors is defined as a master and the other of the electric motors is defined as a follower.
  • the assignment between the master and follower with respect to the sliding or not sliding ver ⁇ roller is arbitrary.
  • the control of one of the electric motors is simplified to a direct connection to an electrical supply network, the electric motor independently controllable from the electrical supply network is necessarily the follower.
  • the control of the master electric motor is given a target value for the speed or the torque of the master electric motor as a reference or target value of the control.
  • An actual value of the torque or the rotational speed of the master electric motor resulting from the control of the master electric motor is multiplied by a load factor in a multiplier.
  • the load distribution factor is a real number between 0 and infinity, preferably without the value 1, particularly preferably in a range between 0.8 and 1.2.
  • the value resulting from the multiplication is used for the determination of a reference value of the control for the follower electric motor.
  • the use may in the simplest case be the direct use of the value resulting from the multiplication as a reference. However, it is also possible that the value resulting from the multiplication is further processed and possibly also combined with another signal.
  • the load distribution factor makes it possible to influence the individual wear of the rolls and a targeted distribution of the load on the two rolls.
  • Figure 1 is a schematic representation of a radial
  • Figure 2 shows a roller mill with two drives from the prior art
  • Figure 3 is a schematic representation of the signal flow in a roll mill with master follower STEU ⁇ tion of the prior art in an initial phase;
  • Figure 4 is a schematic representation of the signal flow in a roll mill with master follower STEU ⁇ tion of the prior art in a production phase;
  • FIG. 5 is a schematic representation of the signal flow in a roll mill according to the invention in a first exemplary embodiment
  • FIG. 6 a schematic representation of the signal flow in a roll mill according to the invention in a second exemplary embodiment
  • Figure 7 shows an exemplary relationship between the
  • a higher-level control for example via a direct input by the operator or via a Distributed Control System (DCS), gives a frequency converter 5 of a master electric motor 2 a setpoint value 61 as a reference for the speed.
  • An actual value 62 of the torque of the master electric motor 2 resulting from the regulation of a speed controller (not shown) of the frequency converter 5 of the master electric motor 2 is multiplied in a multiplier 65 by a load distribution factor 64.
  • the load distribution factor 64 can be determined, for example, by manual input by the operator or a regulation of the load distribution factor 64 which may opti ⁇ onal also include additional measured variables such as the roll diameter.
  • a resulting value is given as a setpoint to a torque controller (not shown) of a frequency converter 5 'of a follower electric motor 2'.
  • the load distribution factor 642 the wear of the individual rollers can be influenced relative to each other.
  • FIG. 6 shows a schematic illustration of the signal flow in a roll mill according to the invention in a second exemplary embodiment.
  • a feedback of the actual value of the torque of the follower electric motor 2 ' is compared with the actual value of the torque of the follower electric motor 2' via a subtraction.
  • controller 66 which controller 66 may be, for example, a PID controller.
  • the controller 66 controls the difference in the torque of the follower electric motor 2 'and converts the controlled signal into a speed value with the aid of the area moment of inertia of the roller 1', which is connected to the follower electric motor 2 '. This direct coupling between torque and speed is ensured by the mechanical coupling of the rollers over the material in the grinding gap.
  • the ratio of the two roller radii corresponds to the gear ratio in a transmission with a gear ratio in the vicinity of 1.
  • the output of the controller 66 is added to the original setpoint value 61 for the speed and there ⁇ after the frequency of the follower electric motor 2 'as the setpoint to hand over.
  • Analogous to FIG. 5 is an optional initial phase ⁇ or a design as speed followers in two variations possible in FIG. 6.
  • the conversion of the controller with the aid of the legislativenträg ⁇ moment of inertia which the signals with the exception of the load ⁇ verteil compositions relate to rotational speed values falls.
  • Fig. 7 shows an exemplary relationship between the wear of the two rollers and the selection of a Lastverteil ⁇ factor 115.
  • the wear 112 of a roll in the form of the reduction of the roll diameter, over the work already done by this roller rotary work 111 from ⁇ educated.
  • the cumulative torque necessary for the grinding of the previously painted material over the time required for grinding is to be verified .
  • the two curves 113, 114 represent the wear 112 of two rolls of a pair of rolls as a function of the turning work 111.
  • the curve 114 shows a greater wear of the corresponding roller than the wear of the roller shown in the curve 113.
  • the load factor 115 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.
  • the load distribution factor tends to be between 0.8 and 1.2.
  • the objective in choosing the load factor is to achieve as even as possible wear of the rolls of a pair of rolls, for example, to replace both rolls in a maintenance and to maximize the time between two maintenance.
  • the choice of load distribution factor possible such as the stronger wear of already stronger worn roller and the protection of less worn roller.
  • the Benö ⁇ preferential energy is minimized because obtain limit the same Wheeliererefe- especially in comparison to the solution in which the two motors, it is ensured that only the energy required for grinding is supplied is guaranteed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Control Of Multiple Motors (AREA)

Abstract

L'invention concerne un broyeur à cylindres comprenant : deux cylindres (1, 1') parallèles l'un à l'autre, pressés l'un contre l'autre et tournant en sens inverse, un des cylindres (1') étant mobile perpendiculairement à la direction axiale de ce cylindre (1') ; deux entraînements, lesquels sont associés à chacun des deux cylindres (1, 1') et lesquels comprennent chacun un moteur électrique (2, 2'), un moteur électrique maître (2) parmi les moteurs électriques prédéfinissant une valeur théorique (61) pour la vitesse ou le couple en tant que référence, et une référence d'un moteur électrique suiveur (2') parmi les moteurs électriques englobant la valeur réelle (62) du couple ou de la vitesse du moteur électrique maître (2) multipliée par un facteur partiel de charge (64).
EP15720343.1A 2014-05-08 2015-05-08 Broyeur à cylindres et son procédé de commande Active EP3140041B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14167575.1A EP2942105A1 (fr) 2014-05-08 2014-05-08 Broyeur à cylindres et son procédé de commande
PCT/EP2015/060196 WO2015169950A1 (fr) 2014-05-08 2015-05-08 Broyeur à cylindres et procédé de commande d'un broyeur à cylindres

Publications (2)

Publication Number Publication Date
EP3140041A1 true EP3140041A1 (fr) 2017-03-15
EP3140041B1 EP3140041B1 (fr) 2018-04-18

Family

ID=50679928

Family Applications (2)

Application Number Title Priority Date Filing Date
EP14167575.1A Withdrawn EP2942105A1 (fr) 2014-05-08 2014-05-08 Broyeur à cylindres et son procédé de commande
EP15720343.1A Active EP3140041B1 (fr) 2014-05-08 2015-05-08 Broyeur à cylindres et son procédé de commande

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP14167575.1A Withdrawn EP2942105A1 (fr) 2014-05-08 2014-05-08 Broyeur à cylindres et son procédé de commande

Country Status (9)

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

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US11020749B2 (en) * 2018-09-30 2021-06-01 Northeastern University Servo control device and method for disc gap in disc powder grinding system
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
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

Family Cites Families (7)

* 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
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
WO2012094219A1 (fr) * 2011-01-08 2012-07-12 Ssi Shredding Systems, Inc. Déchiquetage à vitesse d'avance commandée
DE102011000749A1 (de) 2011-02-15 2012-08-16 Thyssenkrupp Polysius Ag Walzenmühle
AU2014304564A1 (en) * 2013-08-09 2015-12-10 Xtrutech Ltd. A method of compaction of a powder and a roller compaction device
GB201315451D0 (en) * 2013-08-30 2013-10-16 Mmd Design & Consult Mineral breaker

Also Published As

Publication number Publication date
US20170050188A1 (en) 2017-02-23
EP3140041B1 (fr) 2018-04-18
WO2015169950A1 (fr) 2015-11-12
US10946386B2 (en) 2021-03-16
PE20161555A1 (es) 2017-01-14
AU2015257657B2 (en) 2019-01-17
CA2948074C (fr) 2022-06-21
CA2948074A1 (fr) 2015-11-12
CL2016002734A1 (es) 2017-07-07
DK3140041T3 (en) 2018-07-16
ZA201607692B (en) 2018-04-25
EP2942105A1 (fr) 2015-11-11
AU2015257657A1 (en) 2016-12-01

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