EP3140041B1 - Broyeur à cylindres et son procédé de commande - Google Patents

Broyeur à cylindres et son procédé de commande Download PDF

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Publication number
EP3140041B1
EP3140041B1 EP15720343.1A EP15720343A EP3140041B1 EP 3140041 B1 EP3140041 B1 EP 3140041B1 EP 15720343 A EP15720343 A EP 15720343A EP 3140041 B1 EP3140041 B1 EP 3140041B1
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EP
European Patent Office
Prior art keywords
electric motor
rollers
roller
roller mill
follower
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.)
Active
Application number
EP15720343.1A
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German (de)
English (en)
Other versions
EP3140041A1 (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
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ABB Schweiz AG
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Publication date
Application filed by ABB Schweiz AG filed Critical ABB Schweiz AG
Publication of EP3140041A1 publication Critical patent/EP3140041A1/fr
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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 in operation rollers, which are rotatably mounted in a frame, and a 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.
  • 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 roll mills usually have two electric motors, wherein each one electric motor is connected to one of the rollers and drives them.
  • 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 propeller shaft 3 and a planetary gear 4. The connection of the radially displaceable roller 1 with the stationary electric motor 2 via the propeller shaft. 3
  • the joint shaft is connected directly to the shaft of the displaceable roller and for the planetary gear to be arranged between the joint shaft and the electric motor.
  • the joint shaft in addition to the electric motor and the planetary gear of the movable roller is stationary.
  • an electric motor without a speed adjustment of a transmission directly provides the desired speed for the rollers, 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 converter.
  • 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 have both the sliding roller and the fixed roller a greater wear.
  • 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 setpoint 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 given an identical setpoint for the torque.
  • 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 rotational speed of the roller mill proportional to variations of the ground material, which is also disadvantageous for the operation of the roller mill.
  • one of the electric motors is defined as master and the other electric motor as follower.
  • Fig. 3 shows a schematic representation of the signal flow in a roll mill with this third control strategy of the prior art in an initial phase. It is, as in the first control strategy, both frequency inverters 5, 5 'an identical setpoint for the speed 61 is specified as a reference. 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 roll mill 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 follower electric motor 2' is thereby no longer regulated with respect to the rotational speed but with respect to the torque.
  • the frequency converter 5 of the master electric motor 2 also remains 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 follower electric motor 2 '. used in the production phase.
  • both frequency inverters 5, 5 'in the initial phase an identical setpoint torque is specified as a reference and after switching to the production phase of the frequency converter 5' of the follower electric motor 2 ', the actual value of the speed of the master electric motor 2 specified 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 parallel, pressed against each other and in operation counter-rotating rollers and two electric motors, one motor is connected to a 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 according to the parameters of the electrical supply network, such as the frequency and the voltage, a. 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 the motors to 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 master and follower in relation to the displaceable or non-displaceable roller is arbitrary.
  • the independently controllable from the electrical supply network electric motor 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.
  • the actual value of the master electric motor multiplied by the load distribution factor is combined with the nominal value for the rotational speed or the torque, which nominal value serves as a reference for the control of the master electric motor, via an addition of the signals. This limits the influence of the load distribution to small influences on the setpoint.
  • Fig. 5 shows a schematic representation of the signal flow in a roll mill according to the invention in a first exemplary embodiment.
  • a higher-level control for example via a direct input of 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 thereof for the load distribution factor 64, which may optionally also include additional measurement 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
  • Fig. 6 shows a schematic representation of the signal flow in a roll mill according to the invention in a second exemplary embodiment.
  • Fig. 5 there is a feedback of the actual value of the torque of the follower electric motor 2 '.
  • the setpoint value of the torque of the follower electric motor 2 'from the multiplication by the load distribution factor is compared with the actual value of the torque of the follower electric motor 2' via a subtraction.
  • the difference thus formed between the desired value and the actual value of the torque of the follower electric motor 2 ' is transferred to a 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 by means of the area moment of inertia of the roller 1', which is connected to the follower electric motor 2 'in a speed value. 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 transmission ratio in a transmission with a gear ratio close to 1.
  • the output of the controller 66 is added to the original speed setpoint 61 and then passed to the frequency converter of the follower electric motor 2 'as a setpoint.
  • Fig. 5 Analogous to Fig. 5 is also in Fig. 6 an optional initial phase or a configuration as a speed follower in both variations possible.
  • a setpoint for the speed is specified as a reference for the control of the master electric motor, is omitted the conversion of the controller with the aid of the area moment of inertia, which refer to the signals with the exception of the load distribution factor to speed values.
  • Fig. 7 shows an exemplary relationship between the wear of two rollers and the choice of a load distribution factor 115.
  • the wear 112 of a roller in the form of reduction of the roll diameter, is shown about the rotational work 111 already performed by this roller.
  • Under the turning work 111 is the necessary for the grinding of the previously painted material, cumulative torque on the time required for grinding, time to understand.
  • 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. With the same accumulated wear of both rolls, the load distribution factor should take the value one. The greater the difference between the accumulated wear of the two rolls, the further the corresponding load sharing factor is one out of the value. Depending on which of the two rollers has greater wear, the value of the load distribution factor tends to zero or infinity. In practice, 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.
  • it ensures that the energy required is minimized, since, in particular, compared to the solution in which both motors receive the same speed references, it is ensured that only the energy required for grinding is supplied.

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

Claims (8)

  1. Broyeur à cylindres, comprenant:
    deux cylindres (1, 1') disposés parallèlement, pressés l'un contre l'autre et tournant en service en sens contraire, dans lequel
    un des cylindres (1) est déplaçable en direction orthogonale à la direction axiale de ce cylindre (1), et
    deux moteurs électriques (2, 2'), ces moteurs électriques (2, 2') étant respectivement associés à un des deux cylindres (1, 1'), dans lequel
    une valeur de consigne (61) pour le nombre de tours ou le couple moteur est prédéterminée comme valeur de référence à une commande d'un moteur électrique maître (2) des moteurs électriques (2, 2'),
    caractérisé en ce qu'une référence pour une commande d'un moteur électrique esclave (2') des moteurs électriques (2, 2') est basée sur une valeur réelle (62) du couple moteur ou du nombre de tours du moteur électrique maître (2) multipliée par un facteur de répartition de charge (64) .
  2. Broyeur à cylindres selon la revendication 1, dans lequel le facteur de répartition de charge (64) est déterminé en tenant compte d'une pression d'application des cylindres (1, 1'), d'une usure des cylindres individuels (1, 1') ou de la pression d'application et de l'usure.
  3. Broyeur à cylindres selon la revendication 2, dans lequel l'usure des cylindres individuels (1, 1') est quantifiée par le quotient d'une diminution de diamètre d'un cylindre et d'une quantité de matière qui a été broyée jusqu'à présent par ce cylindre.
  4. Broyeur à cylindres selon l'une quelconque des revendications 1 à 3, dans lequel le facteur de répartition de charge (64) est déterminé en tenant compte des diamètres des cylindres (1, 1').
  5. Broyeur à cylindres selon la revendication 1, dans lequel le facteur de répartition de charge (64) est fixé par un opérateur du broyeur à cylindres.
  6. Broyeur à cylindres selon l'une quelconque des revendications 1 à 5, dans lequel la valeur réelle (62) du moteur électrique maître (2) multipliée par le facteur de répartition de charge (64) est comparée à une valeur réelle correspondante du moteur électrique esclave (2') au moyen d'une soustraction et dans lequel la référence pour la commande du moteur électrique esclave (2') est basée sur la valeur de consigne (61) et la valeur résultant de la soustraction.
  7. Broyeur à cylindres selon la revendication 6, dans lequel la valeur comparée est régulée par un régulateur (66) .
  8. Procédé de commande d'un broyeur à cylindres, dans lequel le broyeur à cylindres comprend
    deux cylindres (1, 1') disposés parallèlement, pressés l'un contre l'autre et tournant en service en sens contraire, dans lequel
    un des cylindres (1) est déplaçable en direction orthogonale à la direction axiale de ce cylindre (1), et
    deux moteurs électriques (2, 2'), ces moteurs électriques (2, 2') étant respectivement associés à un des deux cylindres (1, 1'), dans lequel le procédé comprend les étapes suivantes:
    a) définir une valeur de consigne (61) pour le nombre de tours ou le couple moteur comme référence pour une commande d'un moteur électrique maître (2) des moteurs électriques (2, 2');
    b) déterminer une valeur réelle (62) du couple moteur ou du nombre de tours du moteur électrique maître (2);
    caractérisé en ce que le procédé comprend en outre les étapes suivantes:
    c) multiplier la valeur réelle (62) du moteur électrique maître (2) avec un facteur de répartition de charge (64); et
    d) introduire le résultat de l'étape (c) dans la référence pour une commande d'un moteur électrique esclave (2') des moteurs électriques (2, 2').
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 EP3140041A1 (fr) 2017-03-15
EP3140041B1 true EP3140041B1 (fr) 2018-04-18

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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

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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 (8)

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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
EP4542845A1 (fr) * 2023-10-17 2025-04-23 Abb Schweiz Ag Procédé et programme informatique pour faire fonctionner un système d'entraînement, système d'entraînement, système de moteur et support lisible par ordinateur

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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
US8807468B2 (en) * 2011-01-08 2014-08-19 Ssi Shredding Systems, Inc. Controlled feed-rate shredding
DE102011000749A1 (de) 2011-02-15 2012-08-16 Thyssenkrupp Polysius Ag Walzenmühle
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

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Also Published As

Publication number Publication date
CA2948074A1 (fr) 2015-11-12
CL2016002734A1 (es) 2017-07-07
ZA201607692B (en) 2018-04-25
CA2948074C (fr) 2022-06-21
US20170050188A1 (en) 2017-02-23
AU2015257657B2 (en) 2019-01-17
EP3140041A1 (fr) 2017-03-15
DK3140041T3 (en) 2018-07-16
AU2015257657A1 (en) 2016-12-01
PE20161555A1 (es) 2017-01-14
WO2015169950A1 (fr) 2015-11-12
EP2942105A1 (fr) 2015-11-11
US10946386B2 (en) 2021-03-16

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