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EP2170517A1 - Roller mill and method for size reduction of ground material - Google Patents

Roller mill and method for size reduction of ground material

Info

Publication number
EP2170517A1
EP2170517A1 EP09736554A EP09736554A EP2170517A1 EP 2170517 A1 EP2170517 A1 EP 2170517A1 EP 09736554 A EP09736554 A EP 09736554A EP 09736554 A EP09736554 A EP 09736554A EP 2170517 A1 EP2170517 A1 EP 2170517A1
Authority
EP
European Patent Office
Prior art keywords
roller mill
control device
drives
drive
power
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
EP09736554A
Other languages
German (de)
French (fr)
Other versions
EP2170517B2 (en
EP2170517B1 (en
Inventor
Markus Berger
Franz-Josef Zurhove
Ludger Kimmeyer
Carsten Sachse
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.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Polysius 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
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Application filed by Polysius AG filed Critical Polysius AG
Publication of EP2170517A1 publication Critical patent/EP2170517A1/en
Application granted granted Critical
Publication of EP2170517B1 publication Critical patent/EP2170517B1/en
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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
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • 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

Definitions

  • the invention relates to a roller mill and to a method for comminuting material to be ground, the roller mill having a grinding table, at least one grinding roller and at least two drives for driving the roller mill.
  • the grinding table is usually driven in roller mills, which drives the grinding rollers on the grinding bed.
  • roller mills which drives the grinding rollers on the grinding bed.
  • each grinding roller is associated with a drive motor. Furthermore, the grinding table has an auxiliary drive.
  • the grinding table is driven by an arrangement of more than two drives.
  • electric motors are provided, which are fed by frequency converters and controlled by means of which speed and torque.
  • Frequency inverters are organized according to the master-slave principle to ensure that all drives operate synchronously. These frequency converters, however, result in high costs for the drive train.
  • the invention is therefore based on the object to reduce the cost of the control devices.
  • the inventive roller mill has a grinding table, at least one grinding roller and at least two motors (drives) with stator and
  • Rotor winding for driving the roller mill is equipped with at least one control device for controlling the motor torque of at least one drive.
  • the control device is connected to the rotor winding of at least one drive for influencing the rotor current.
  • the control device to the rotor winding at least one drive connected to perform a compensation control by controlling the engine torque.
  • the regulation takes place by influencing the current of the rotor winding of at least one drive in order to regulate the power of the drives in a predetermined relationship to one another.
  • the influencing of the motor torque is effected by directly influencing the rotor current, wherein an indirect influence of the stator current is caused.
  • the influencing of the rotor current can be done, for example, by converters whose performance depends on this type of influence on the speed deviation between the operating and the nominal point, which is generally ⁇ 30% of
  • the system can be designed so that the grinding operation in case of failure of a drive must not be interrupted (redundancy).
  • the drives are preferably by asynchronous motors and the at least one motor to be influenced is formed in particular by a slip ring motor.
  • the performance of the control device may be less than 50%, preferably not more than 30% of the rated power of the associated drive.
  • Control devices are for example a frequency converter, a power converter cascade or a matrix converter used. It is conceivable that the control device is arranged stationary or co-rotates with the rotor of the drive.
  • a low-voltage system can be provided whose voltage is for example a maximum of 690 V.
  • the at least two drives can optionally either the grinding rollers and / or the
  • Fig. 1 is a schematic representation of a roller mill with a
  • FIG. 2 is a schematic representation of a designed as a frequency converter with voltage intermediate control device
  • FIG. 3 shows a schematic representation of a control device designed as a power converter cascade
  • Fig. 4 is a schematic representation of a trained as a matrix converter control device
  • Fig. 5 is a schematic representation of a co-rotating with the rotor control device.
  • the roller mill 1 shown in Fig.l has a grinding table 10, at least two grinding rollers 11, 12 and at least two drives 13, 14 for driving the two grinding rollers 11, 12.
  • Each drive includes a motor and optionally a gearbox.
  • a plurality of grinding rollers in particular three, four or more grinding rollers can be provided.
  • the grinding table 10 is freely rotatable about an axis of rotation 10a, so that it is set in rotation only via the driven grinding rollers 11, 12 and the grinding material 3 located between the grinding roller and the grinding table. It would also be conceivable that the grinding table is assigned its own drive which consists of at least one motor.
  • Mahlgutbett changes the ratio of Mahlrolle to Mahlteller continuously.
  • the gear ratio is ultimately determined by the distance of the
  • the distance ri of the force application point of the grinding roller 11 to the rotation axis 10a is smaller than the distance r 2 of the force application point of the grinding roller 12 to the rotation axis 10a.
  • a compensation control device 2 wherein by controlling the engine torque (and thus optionally also the rotor speed) of at least one drive, the power of the drives 13, 14 are regulated in a predetermined ratio to each other.
  • Embodiment are provided for the two identically designed grinding rollers 11, 12 the same drives 13, 14, so that the compensation control device 2 keeps the performance of the two drives at the same level.
  • the compensation control device 2 consists in the illustrated embodiment essentially of one of the drives 13, 14 associated control device 20, 21, which is designed as a converter, a power compensation regulator 22 and possibly a Mahltellercardiereregler 23rd
  • the drives 13, 14 are preferably formed by asynchronous motors, in particular slip ring motors whose stator winding 13a, 14a are connected to a network 15 (three-phase system, low or medium voltage) and its rotor winding 13b, 14b to the control device 20 and 21 respectively.
  • asynchronous motors in particular slip ring motors whose stator winding 13a, 14a are connected to a network 15 (three-phase system, low or medium voltage) and its rotor winding 13b, 14b to the control device 20 and 21 respectively.
  • 21 are preferably low-voltage systems with a maximum Voltage of 690 V. They are therefore possibly connected via a transformer 16 to the network 15.
  • the control devices 20, 21 measure from the drives 13, 14 the instantaneous motor current and the motor voltage. From this, the power consumption of each
  • Resistance torque this value depends essentially only on the speed of the respective drive.
  • a deviation between the actual drive power and the nominal drive power is applied to the power balancing controller 22, which effects a power adjustment of the two drives 13, 14 by adapting the rotor current of the respective drive accordingly, so that the power of the two drives in the predetermined ratio, in case at the same level.
  • an additional control for the Mahltellerprintiere is provided, which is realized here by the Mahltellerthermiereregler 23.
  • Mahltellerthregler 23 is connected to a not shown
  • Mahltellerrectieresensor in conjunction and receives at sufficiently small intervals the actual value of the speed of the grinding table 10, which is compared with the setpoint ns o ii, resulting in the control deviation. From this, the controller generates the target speed for the power balancing device 22 at a firmly assumed gear ratio, which can change this value.
  • the control device 20, 21 may also have an internal speed controller and a revolving engine model, whereby the drive speed of the drives and the engine torque can be tapped.
  • the controllers must be able to control and status data every 5-10 ms read or output, so that the function of the compensation control device is ensured.
  • the system is a cascade control, the individual levels are dynamically decoupled from each other and thus can be considered individually.
  • the advantage of the regulation described above is that with a power compensation control, the power consumption of the drives 13, 14 differ only slightly from each other and even large changes in the system (translation jump) are corrected very quickly.
  • control devices 20, 21 are expediently formed by converters, wherein it is not necessary that the entire power of the drives 13, 14 can be regulated by the control device 20, 21, as was the case in the prior art
  • the rotor current can be influenced for regulation.
  • This type of influencing the drives offers the possibility that the performance of the control devices can be chosen to be much smaller than the rated power of the associated drives.
  • the power is the
  • Control devices less than 50%, preferably at most 30% of the rated power of the associated drives. Since the costs of the control devices designed as converters depend proportionally on the power of the control devices, 50 or 70% and more of the costs for the control devices can be saved in this way. Reference to the figures 2 to 5 different exemplary embodiments for the control device 20 and 21 are shown below.
  • control device 20 or 21 is designed as a frequency converter 20.1 with a voltage intermediate circuit. He exists in
  • the input stage 20a converts the frequency-fixed three-phase current into
  • the intermediate circuit 20c has a capacitor and is used for decoupling the input and output stage (energy storage).
  • control device is a speed reduction (recovery of energy into the grid) but also an increase in speed (additional power) possible.
  • the magnetization of the motor can be influenced in a targeted manner (can also be represented as a capacitive load relative to the network).
  • a start-up module 2Od can be provided, but this is only necessary if the drive 13, 14 has to start under rated load (or above). Then, during startup instead of the control device, the start-up module 20d is connected to the rotor winding. If, on the other hand, the roller mill is started without load (possibly at partial load ⁇ 50% of rated load), this start-up module is not required.
  • the control device 20, 21 is designed as Stromumrichterkaskade 20.2. It is a sub-synchronous converter cascade. Through targeted influence of current, the engine slip and thus the speed, or the engine torque of the drive can be specifically influenced. This is the
  • the power converter cascade can feed energy back into the network via a thyristor stage 20g.
  • the advantage of the power converter cascade is that operation in the vicinity of the synchronous speed for the components is not a problem. Furthermore, it comes with fewer components than the frequency converter 20.1, in particular, can be dispensed with the DC link capacitor, thereby increasing the life.
  • the control device 20, 21 of the embodiment shown in Fig. 4 is formed by a matrix converter 20.3.
  • the frequency-fixed input phases are time-correctly interconnected so that frequency-variable output voltages can be provided.
  • the energy flow in both directions is possible.
  • the advantage of a matrix converter is that no memory modules (capacitance or inductance) are necessary. Again, an operation in the vicinity of the synchronous speed for the components by their operation is not a problem. In addition, the energy flow is possible without additional components in both directions. This controller should therefore have a better efficiency over the other embodiments.
  • Fig. 5 finally shows a schematic representation of a co-rotating with the rotor winding 13a, 14a controller 20, 21. This opens the
  • the required power of the control device will therefore generally amount to a maximum of 30% of the rated motor power of the drive.
  • Motor powers are to be regulated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Control Of Multiple Motors (AREA)
  • Disintegrating Or Milling (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention relates to a roller mill having a grinding table, at least one grinding roller and at least two drives with a rotor winding for driving the roller mill and at least one adjustment device for adjusting the motor torque of at least one drive, the adjustment device being connected to the rotor winding of at least one drive in order to influence the rotor current.

Description

Rollenmühle und Verfahren zur Zerkleinerung von Mahlgut Roller mill and method for comminution of regrind
Die Erfindung betrifft eine Rollenmühle sowie ein Verfahren zur Zerkleinerung von Mahlgut, wobei die Rollenmühle, einen Mahlteller, wenigstens eine Mahlrolle sowie wenigstens zwei Antriebe zum Antreiben der Rollenmühle aufweist.The invention relates to a roller mill and to a method for comminuting material to be ground, the roller mill having a grinding table, at least one grinding roller and at least two drives for driving the roller mill.
In der Praxis wird bei Rollenmühlen üblicherweise der Mahlteller angetrieben, welcher über das Mahlbett die Mahlrollen antreibt. Dies führt jedoch zu starken Leistungsschwankungen und somit zu hohen Belastungen des Antriebsstranges, sodass man in der sicher zu übertragenden Antriebsleistung sehr begrenzt ist.In practice, the grinding table is usually driven in roller mills, which drives the grinding rollers on the grinding bed. However, this leads to strong power fluctuations and thus to high loads on the drive train, so that one is very limited in the safely transmitted power drive.
In der DE 38 01 728 wird eine Rollenmühle beschrieben, bei der jeder Mahlrolle ein Antriebsmotor zugeordnet ist. Weiterhin verfügt der Mahlteller über einen Hilfsantrieb.In DE 38 01 728 a roller mill is described in which each grinding roller is associated with a drive motor. Furthermore, the grinding table has an auxiliary drive.
Auch in der DE 197 02 854 Al wurde bereits vorgeschlagen, die Rollen anzutreiben. Dort wurde auch darauf hingewiesen, dass die einzelnen Mahlrollen einerseits über den Mahlteller und dem darauf befindlichen Mahlgut bzw. Mahlgutbett miteinander gekoppelt sind und andererseits stark unterschiedliche Leistungsaufnahmen haben können, die beispielsweise auf unterschiedliche Abrolldurchmesser auf dem Mahlteller (Lage des Kraftangriffspunkt / Radius), unterschiedliche Wirkdurchmesser der einzelnen Mahlrollen (z.B. durch Verschleiß) und auf ein unterschiedliches Einzugsverhalten des Mahlgutes im Zusammenwirken auf Mahlteller und Mahlrolle zurückzuführen sind.It has also been proposed in DE 197 02 854 Al to drive the rollers. There, it was also pointed out that the individual grinding rollers are coupled with one another via the grinding plate and the ground material or meal bed thereon and on the other hand can have very different power consumptions, for example different rolling diameters on the grinding plate (position of the force application point / radius) Effective diameter of the individual grinding rollers (eg due to wear) and due to a different feed behavior of the ground material in cooperation on grinding plate and grinding roller are due.
Bereits geringe Drehzahlabweichungen zwischen einzelnen Mahlrollen bewirken bei den Antrieben relativ hohe Leistungsschwankungen. Dies kann dazu führen, dass die Mahlrollen dauernd beschleunigt oder verzögert werden, d.h. die einzeln angetriebenen Mahlrollen arbeiten gegeneinander, was während des Zerkleinerungsbetriebes zu einem deutlich erhöhten Kraft- bzw. Energiebedarf führt. In der DE-Al -197 02 854 wird daher vorgeschlagen, dass die Betriebsschwankungen zwischen den einzelnen Drehantrieben aller angetriebenen Mahlrollen durch eine gemeinsame Lastausgleichsregelung ausgeglichen werden. Dennoch sind bei dynamischen Übersetzungsänderungen zwischen Mahlteller und Mahlrolle die Leistungsaufnahmen der Antriebe sehr unterschiedlich.Even small speed deviations between individual grinding rollers cause relatively high power fluctuations in the drives. This can cause the grinding rollers are constantly accelerated or decelerated, ie the individually driven grinding rollers work against each other, which leads to a significantly increased power and energy requirements during the crushing operation. It is therefore proposed in DE-A1-197 02 854 that the operating fluctuations between the individual rotary drives of all driven grinding rollers be compensated by a common load balancing control. Nevertheless, with dynamic translation changes between grinding table and grinding roller, the power consumption of the drives are very different.
Aus der DE-Al-10 2006 050 205 ist weiterhin eine Rollenmühle bekannt, dessen Mahlteller durch eine Anordnung von mehr als zwei Antrieben angetrieben wird. Für die Antriebe sind Elektromotoren vorgesehen, die über Frequenzumrichter gespeist werden und mit deren Hilfe Drehzahl und Drehmoment geregelt werden. DieFrom DE-Al-10 2006 050 205 a roller mill is further known, the grinding table is driven by an arrangement of more than two drives. For the drives electric motors are provided, which are fed by frequency converters and controlled by means of which speed and torque. The
Frequenzumrichter sind nach dem Master-Slave-Prinzip organisiert, um sicherzustellen, dass alle Antriebe synchron arbeiten. Durch diese Frequenzumrichter entstehen jedoch hohe Kosten für den Antriebsstrang.Frequency inverters are organized according to the master-slave principle to ensure that all drives operate synchronously. These frequency converters, however, result in high costs for the drive train.
Die DE 201 06 177 Ul betrifft einen Kollergang mit Zusatzantrieb, der eine direkteDE 201 06 177 Ul relates to a muller gang with auxiliary drive, the direct
Drehmomentenregelung aufweist.Torque control has.
Der Erfindung liegt daher die Aufgabe zugrunde, die Kosten für die Regeleinrichtungen zu verringern.The invention is therefore based on the object to reduce the cost of the control devices.
Erfindungsgemäß wird diese Aufgabe durch die Merkmale der Ansprüche 1 und 14 gelöst.According to the invention, this object is solved by the features of claims 1 and 14.
Die erfmdungsgemäße Rollenmühle weist einen Mahlteller, wenigstens eine Mahlrolle sowie wenigstens zwei Motoren (Antriebe) mit Ständer- undThe inventive roller mill has a grinding table, at least one grinding roller and at least two motors (drives) with stator and
Läuferwicklung zum Antreiben der Rollenmühle auf und ist mit wenigstens einer Regeleinrichtung zur Regelung des Motormomentes wenigstens eines Antriebes ausgestattet. Die Regeleinrichtung ist dabei an die Läuferwicklung wenigstens eines Antriebes zur Beeinflussung des Läuferstromes angeschlossen. Beim erfϊndungsgemäßen Verfahren zur Zerkleinerung von Mahlgut mit einer Rollenmühle, die einen Mahlteller, wenigstens eine Mahlrolle, wenigstens zwei Antriebe mit Ständer- und Läuferwicklung zum Antreiben der Rollenmühle sowie wenigstens eine Regeleinrichtung zur Regelung des Motormomentes aufweist, wird die Regeleinrichtung an die Läuferwicklung wenigstens eines Antriebes angeschlossen, um durch Regelung des Motormomentes eine Ausgleichregelung durchzuführen. Dabei erfolgt die Regelung durch Beeinflussung des Stroms der Läuferwicklung wenigstens eines Antriebes, um die Leistung der Antriebe in einem vorgegebenen Verhältnis zueinander zu regeln.Rotor winding for driving the roller mill and is equipped with at least one control device for controlling the motor torque of at least one drive. The control device is connected to the rotor winding of at least one drive for influencing the rotor current. In the inventive method for comminution of millbase with a roller mill having a grinding table, at least one grinding roller, at least two drives with stator and rotor winding for driving the roller mill and at least one control device for controlling the engine torque, the control device to the rotor winding at least one drive connected to perform a compensation control by controlling the engine torque. In this case, the regulation takes place by influencing the current of the rotor winding of at least one drive in order to regulate the power of the drives in a predetermined relationship to one another.
Unter der Läuferwicklung im Sinne der Erfindung ist auch eine Kurzschlusswicklung eines Asynchronmotors mit Kurzschlussläufer zu verstehen.Under the rotor winding in the context of the invention, a short-circuit winding of an asynchronous motor with squirrel cage rotor is to be understood.
Die Beeinflussung des Motormomentes erfolgt durch direkte Beeinflussung des Läuferstromes, wobei eine indirekte Beeinflussung des Ständerstromes hervorgerufen wird.The influencing of the motor torque is effected by directly influencing the rotor current, wherein an indirect influence of the stator current is caused.
Die Beeinflussung des Läuferstromes kann beispielsweise durch Umrichter erfolgen, dessen Leistung sich bei dieser Art der Beeinflussung nach der Drehzahlabweichung zwischen dem Betriebs- und den Nennpunkt richtet, die im Allgemeinen < 30% derThe influencing of the rotor current can be done, for example, by converters whose performance depends on this type of influence on the speed deviation between the operating and the nominal point, which is generally <30% of
Nennmotorleistung ist. Es können somit Umrichter mit einer wesentlich geringeren Leistung zum Einsatz kommen. Da die Umrichterkosten nahezu proportional zu ihrer Leistung sind, kann hier eine Kosteneinsparung von bis zu 70% und mehr erreicht werden. Die Aufteilung des Antriebes der Rollenmühle auf mehrere Antriebe hat zudem den Vorteil, dass entsprechend kleinere Motoren und einfachere Getriebe zumRated motor power is. It is thus possible to use converters with a considerably lower power. Since the converter costs are almost proportional to their performance, a cost saving of up to 70% and more can be achieved here. The division of the drive of the roller mill on several drives also has the advantage that correspondingly smaller engines and simpler transmission for
Einsatz kommen können. Außerdem kann das System so ausgelegt werden, dass der Mahlbetrieb bei Ausfall eines Antriebes nicht unterbrochen werden muss (Redundanz).Use can come. In addition, the system can be designed so that the grinding operation in case of failure of a drive must not be interrupted (redundancy).
Weitere Vorteile und Ausgestaltungen der Erfindung sind Gegenstand derFurther advantages and embodiments of the invention are the subject of
Unteransprüche . Die Antriebe werden vorzugsweise durch Asynchronmotoren und der mindestens eine zu beeinflussende Motor wird insbesondere durch einen Schleifringmotor gebildet. Die Leistung der Regeleinrichtung kann weniger als 50%, vorzugsweise maximal 30% der Nennleistung des zugehörigen Antriebes betragen. AlsSubclaims. The drives are preferably by asynchronous motors and the at least one motor to be influenced is formed in particular by a slip ring motor. The performance of the control device may be less than 50%, preferably not more than 30% of the rated power of the associated drive. When
Regeleinrichtungen kommen beispielsweise ein Frequenzumrichter, eine Stromrichterkaskade oder ein Matrixumrichter zum Einsatz. Dabei ist es denkbar, dass die Regeleinrichtung ortsfest angeordnet ist oder mit dem Rotor des Antriebs mitrotiert.Control devices are for example a frequency converter, a power converter cascade or a matrix converter used. It is conceivable that the control device is arranged stationary or co-rotates with the rotor of the drive.
Durch die entsprechend geringere Leistung der Regeleinrichtung kann ein Niederspannungssystem vorgesehen werden, dessen Spannung beispielsweise maximal 690 V beträgt.Due to the correspondingly lower power of the control device, a low-voltage system can be provided whose voltage is for example a maximum of 690 V.
Die wenigstens zwei Antriebe können dabei wahlweise die Mahlrollen und/oder denThe at least two drives can optionally either the grinding rollers and / or the
Mahlteller antreiben.Drive the grinding table.
Weitere Vorteile und Ausgestaltungen der Erfindung werden im Folgenden anhand der Beschreibung und der Zeichnung näher erläutert.Further advantages and embodiments of the invention will be explained in more detail below with reference to the description and the drawing.
In der Zeichnung zeigenIn the drawing show
Fig. 1 eine schematische Darstellung einer Rollenmühle mit einerFig. 1 is a schematic representation of a roller mill with a
Ausgleichsregelungsvorrichtung,Equalization device
Fig. 2 eine schematische Darstellung einer als Frequenzumrichter mit Spannungszwischenkreis ausgebildeten Regeleinrichtung,2 is a schematic representation of a designed as a frequency converter with voltage intermediate control device,
Fig. 3 eine schematische Darstellung einer als Stromrichterkaskade ausgebildeten Regeleinrichtung, Fig. 4 eine schematische Darstellung einer als Matrixumrichter ausgebildeten Regeleinrichtung und3 shows a schematic representation of a control device designed as a power converter cascade, Fig. 4 is a schematic representation of a trained as a matrix converter control device and
Fig. 5 eine schematische Darstellung einer mit dem Rotor mitrotierenden Regeleinrichtung.Fig. 5 is a schematic representation of a co-rotating with the rotor control device.
Die in Fig.l dargestellte Rollenmühle 1 weist einen Mahlteller 10, wenigstens zwei Mahlrollen 11, 12 sowie wenigstens zwei Antriebe 13, 14 zum Antreiben der beiden Mahlrollen 11, 12 auf. Jeder Antrieb umfasst einen Motor und optional ein Getriebe. Im Rahmen der Erfindung können selbstverständlich auch mehrere Mahlrollen, insbesondere drei, vier oder mehr Mahlrollen vorgesehen werden.The roller mill 1 shown in Fig.l has a grinding table 10, at least two grinding rollers 11, 12 and at least two drives 13, 14 for driving the two grinding rollers 11, 12. Each drive includes a motor and optionally a gearbox. In the context of the invention, of course, a plurality of grinding rollers, in particular three, four or more grinding rollers can be provided.
Der Mahlteller 10 ist um eine Drehachse 10a frei drehbar, sodass er lediglich über die angetriebenen Mahlrollen 11, 12 und das zwischen Mahlrolle und Mahlteller befindliche Mahlgut 3 in Rotation versetzt wird. Es wäre aber auch denkbar, dass dem Mahlteller ein eigener Antrieb der aus mindestens einem Motor besteht, zugeordnet wird.The grinding table 10 is freely rotatable about an axis of rotation 10a, so that it is set in rotation only via the driven grinding rollers 11, 12 and the grinding material 3 located between the grinding roller and the grinding table. It would also be conceivable that the grinding table is assigned its own drive which consists of at least one motor.
Die Übertragung der Drehbewegung der Mahlrollen 11, 12 auf den Mahlteller 10 erfolgt über das Mahlgut 3. Durch das in der Praxis nicht gleichmäßig ausgebildeteThe transmission of the rotational movement of the grinding rollers 11, 12 on the grinding table 10 via the ground material 3. By not uniformly trained in practice
Mahlgutbett ändert sich das Übersetzungsverhältnis von Mahlrolle zu Mahlteller laufend. Das Übersetzungsverhältnis wird letztendlich durch den Abstand desMahlgutbett changes the ratio of Mahlrolle to Mahlteller continuously. The gear ratio is ultimately determined by the distance of the
Kraftangriffspunktes zwischen Mahlrollenachse und Mahltellerachse bestimmt. In der Zeichnung ist der Abstand ri des Kraftangriffspunktes der Mahlrolle 11 zur Drehachse 10a kleiner als der Abstand r2 des Kraftangriffspunktes der Mahlrolle 12 zur Drehachse 10a.Force application point between Mahlrollenachse and Mahltellerachse determined. In the drawing, the distance ri of the force application point of the grinding roller 11 to the rotation axis 10a is smaller than the distance r 2 of the force application point of the grinding roller 12 to the rotation axis 10a.
Schon ein geringes unterschiedliches Übersetzungsverhältnis führt jedoch dazu, dass bei nahezu gleicher Drehzahl der Mahlrollen 11, 12 unterschiedliche Drehmomente auf den Mahlteller übertragen werden. Dadurch wird der eine Antrieb gegenüber dem anderen Antrieb abgebremst bzw. beschleunigt. Auch eine Lastausgleichsregelung und die damit verbundenen relativ gleichen Drehmomente, fuhren aufgrund der unterschiedlichen Übersetzungsverhältnissen zu unterschiedlichen Leistungen. Diese daraus resultierenden starken Leistungsschwankungen der Antriebe haben einen erhöhten Energiebedarf zur Folge.Even a slight difference in gear ratio, however, means that at almost the same speed of the grinding rollers 11, 12 different torques are transmitted to the grinding table. As a result, one drive is braked or accelerated with respect to the other drive. Also a load balancing control and the associated relatively equal torques, due to the different gear ratios lead to different benefits. These resulting strong power fluctuations of the drives result in an increased energy requirement.
Außerdem wird die gewünschte Leistungsverteilung zwischen den Antrieben damit zerstört.In addition, the desired power distribution between the drives is destroyed.
Um diese Auswirkungen zu vermeiden ist eine Ausgleichsregelungsvorrichtung 2 vorgesehen, wobei durch Regelung des Motormomentes (und damit optional auch die Läuferdrehzahl) wenigstens eines Antriebes die Leistung der Antriebe 13, 14 in einem vorgegebenen Verhältnis zueinander geregelt werden. Im dargestelltenIn order to avoid these effects, a compensation control device 2 is provided, wherein by controlling the engine torque (and thus optionally also the rotor speed) of at least one drive, the power of the drives 13, 14 are regulated in a predetermined ratio to each other. In the illustrated
Ausführungsbeispiel sind für die beiden identisch ausgebildeten Mahlrollen 11, 12 gleiche Antriebe 13, 14 vorgesehen, sodass die Ausgleichsregelungsvorrichtung 2 die Leistung der beiden Antriebe auf gleichem Niveau hält.Embodiment are provided for the two identically designed grinding rollers 11, 12 the same drives 13, 14, so that the compensation control device 2 keeps the performance of the two drives at the same level.
Es wäre aber auch denkbar, dass neben ein oder mehreren Mahlrollen auch der Mahlteller über einen eigenen Antrieb verfügt oder unterschiedlich große Mahlrollen zum Einsatz kommen. In diesen Fällen könnten die Antriebe mit unterschiedlichen Leistungen betrieben werden.But it would also be conceivable that in addition to one or more grinding rollers and the grinding table has its own drive or different sized grinding rollers are used. In these cases, the drives could be operated with different powers.
Die Ausgleichsregelungsvorrichtung 2 besteht im dargestellten Ausführungsbeispiel im Wesentlichen aus je einer den Antriebe 13, 14 zugeordneten Regeleinrichtung 20, 21, die als Umrichter ausgebildet ist, einem Leistungsausgleichsregler 22 und ggf. einem Mahltellerdrehzahlregler 23.The compensation control device 2 consists in the illustrated embodiment essentially of one of the drives 13, 14 associated control device 20, 21, which is designed as a converter, a power compensation regulator 22 and possibly a Mahltellerdrehzahlregler 23rd
Die Antriebe 13, 14 werden vorzugsweise durch Asynchronmotoren, insbesondere durch Schleifringmotoren gebildet, dessen Ständerwicklung 13a, 14a an ein Netz 15 (Drehstromnetz, Nieder- oder Mittelspannung) und dessen Läuferwicklung 13b, 14b an die Regeleinrichtung 20 bzw. 21 angeschlossen sind. Bei den RegeleinrichtungenThe drives 13, 14 are preferably formed by asynchronous motors, in particular slip ring motors whose stator winding 13a, 14a are connected to a network 15 (three-phase system, low or medium voltage) and its rotor winding 13b, 14b to the control device 20 and 21 respectively. At the control devices
20, 21 handelt es sich bevorzugt um Niederspannungssysteme mit einer maximalen Spannung von 690 V. Sie sind daher ggf. über einen Transformator 16 an das Netz 15 angeschlossen.20, 21 are preferably low-voltage systems with a maximum Voltage of 690 V. They are therefore possibly connected via a transformer 16 to the network 15.
Die Regeleinrichtungen 20, 21 messen von den Antrieben 13, 14 den momentanen Motorstrom und die Motorspannung. Daraus wird die Leistungsaufnahme jedesThe control devices 20, 21 measure from the drives 13, 14 the instantaneous motor current and the motor voltage. From this, the power consumption of each
Antriebs ermittelt und ein gleitender Summenmittelwert gebildet, der mit einemDrive is detected and a moving sum mean value formed with a
Faktor (bei gleichen Leistungen der hier dargestellten 2 Antriebe = 0,5) gewichtet wird und den Sollwert des Antriebes darstellt. Bei nahezu konstantemFactor (for the same powers of the two drives shown here = 0.5) is weighted and represents the setpoint of the drive. At almost constant
Widerstandsmoment hängt dieser Wert im Wesentlichen nur von der Drehzahl des jeweiligen Antriebes ab.Resistance torque, this value depends essentially only on the speed of the respective drive.
Eine Abweichung zwischen Antriebs-Istleistung und Antriebs-Sollleistung wird auf den Leistungsausgleichsregler 22 gegeben, welcher eine Leistungsanpassung der beiden Antriebe 13, 14 bewirkt, indem der Läuferstrom des jeweiligen Antriebs entsprechend angepasst wird, sodass die Leistung der beiden Antriebe in dem vorgegebenen Verhältnis, im vorliegenden Fall auf gleiches Niveau, geregelt wird.A deviation between the actual drive power and the nominal drive power is applied to the power balancing controller 22, which effects a power adjustment of the two drives 13, 14 by adapting the rotor current of the respective drive accordingly, so that the power of the two drives in the predetermined ratio, in case at the same level.
Zweckmäßigerweise wird eine zusätzliche Regelung für die Mahltellerdrehzahl vorgesehen, die hier durch den Mahltellerdrehzahlregler 23 verwirklicht ist. Der Mahltellerdrehzahlregler 23 steht mit einem nicht näher dargestelltenAdvantageously, an additional control for the Mahltellerdrehzahl is provided, which is realized here by the Mahltellerdrehzahlregler 23. The Mahltellerdrehzahlregler 23 is connected to a not shown
Mahltellerdrehzahlsensor in Verbindung und erhält in ausreichend geringen Abständen den Istwert der Drehzahl des Mahltellers 10, der mit dem Sollwert nsoii verglichen wird, woraus sich die Regelabweichung ergibt. Daraus erzeugt der Regler bei einem fest angenommnen Übersetzungsverhältnis die Solldrehzahl für die Leistungsausgleichsvorrichtung 22, welche diesen Wert verändern kann.Mahltellerdrehzahlsensor in conjunction and receives at sufficiently small intervals the actual value of the speed of the grinding table 10, which is compared with the setpoint ns o ii, resulting in the control deviation. From this, the controller generates the target speed for the power balancing device 22 at a firmly assumed gear ratio, which can change this value.
Die Regeleinrichtung 20, 21 kann auch über einen internen Drehzahlregler und ein mitlaufendes Motormodell verfügen, wodurch die Antriebsdrehzahl der Antriebe und das Motormoment abgegriffen werden können. Zweckmäßigerweise müssen die Regeleinrichtungen in der Lage sein, Steuer- und Zustandsdaten alle 5-10 ms einzulesen bzw. auszugeben, damit die Funktion der Ausgleichsregelungsvorrichtung gewährleistet ist.The control device 20, 21 may also have an internal speed controller and a revolving engine model, whereby the drive speed of the drives and the engine torque can be tapped. Conveniently, the controllers must be able to control and status data every 5-10 ms read or output, so that the function of the compensation control device is ensured.
Regelungstechnisch stellt sich das System als Kaskadenregelung dar, wobei die einzelnen Ebenen dynamisch voneinander entkoppelt sind und somit einzeln betrachtet werden können. Der Vorteil der oben beschriebenen Regelung besteht darin, dass mit einer Leistungsausgleichsregelung die Leistungsaufnahmen der Antriebe 13, 14 nur geringfügig voneinander abweichen und selbst starke Änderungen im System (Übersetzungssprung) sehr schnell korrigiert werden.Control technology, the system is a cascade control, the individual levels are dynamically decoupled from each other and thus can be considered individually. The advantage of the regulation described above is that with a power compensation control, the power consumption of the drives 13, 14 differ only slightly from each other and even large changes in the system (translation jump) are corrected very quickly.
Weiterhin ist von Vorteil, dass nahezu vollständig auf aufwändige und wartungsintensive Messtechnik verzichtet werden kann, da die eingesetzten Umrichter alle relevanten Daten bis auf die Mahltellerdrehzahl bereitstellen. Mit den Regeleinrichtungen 20, 21 können darüber hinaus die Regeleingriffe nahezu leistungslos erfolgen, sodass der Gesamtwirkungsgrad auf dem Niveau eines ungeregelten Antriebs liegt.Furthermore, it is advantageous that it is possible to dispense almost completely with time-consuming and maintenance-intensive measuring technology, since the inverters used provide all relevant data except for the grinding table speed. In addition, with the control devices 20, 21, the control interventions can take place almost without power, so that the overall efficiency is at the level of an uncontrolled drive.
Die Regeleinrichtungen 20, 21 werden zweckmäßigerweise durch Umrichter gebildet, wobei es nicht erforderlich ist, dass die gesamte Leistung der Antriebe 13, 14 durch die Regeleinrichtung 20, 21 regelbar ist, wie das bisher im Stand derThe control devices 20, 21 are expediently formed by converters, wherein it is not necessary that the entire power of the drives 13, 14 can be regulated by the control device 20, 21, as was the case in the prior art
Technik der Fall ist. Wird die Regeleinrichtung mit der Läuferwicklung der Antriebe verbunden, kann zur Regelung der Läuferstrom beeinflusst werden. Diese Art der Beeinflussung der Antriebe bietet die Möglichkeit, dass die Leistung der Regeleinrichtungen wesentlich kleiner als die Nennleistungen der zugeordneten Antriebe gewählt werden kann. Vorzugsweise beträgt die Leistung derTechnique is the case. If the control device is connected to the rotor winding of the drives, the rotor current can be influenced for regulation. This type of influencing the drives offers the possibility that the performance of the control devices can be chosen to be much smaller than the rated power of the associated drives. Preferably, the power is the
Regeleinrichtungen weniger als 50%, vorzugsweise maximal 30% der Nennleistung der zugeordneten Antriebe. Nachdem die Kosten der als Umrichter ausgebildeten Regeleinrichtungen proportional von der Leistung der Regeleinrichtungen abhängen, können auf diese Weise 50 bzw. 70% und mehr an Kosten für die Regeleinrichtungen eingespart werden. Anhand der Figuren 2 bis 5 werden im Folgenden verschiedene Ausfuhrungsbeispiele für die Regelungseinrichtung 20 bzw. 21 dargestellt.Control devices less than 50%, preferably at most 30% of the rated power of the associated drives. Since the costs of the control devices designed as converters depend proportionally on the power of the control devices, 50 or 70% and more of the costs for the control devices can be saved in this way. Reference to the figures 2 to 5 different exemplary embodiments for the control device 20 and 21 are shown below.
In dem Ausführungsbeispiel gemäß Fig. 2 ist die Regeleinrichtung 20 bzw. 21 als Frequenzumrichter 20.1 mit Spannungszwischenkreis ausgebildet. Er besteht imIn the embodiment according to FIG. 2, the control device 20 or 21 is designed as a frequency converter 20.1 with a voltage intermediate circuit. He exists in
Wesentlichen aus einer Eingangsstufe 20a und einer Ausgangsstufe 20b und einemEssentially of an input stage 20a and an output stage 20b and a
Zwischenkreis 20c. Die Eingangsstufe 20a wandelt den frequenzfesten Drehstrom inDC link 20c. The input stage 20a converts the frequency-fixed three-phase current into
Gleichstrom für den Zwischenkreis um und umgekehrt (Rückspeiseweg), während die Ausgangsstufe den Gleichstrom in frequenzvariablen Wechselstrom und umgekehrt umwandelt. Der Zwischenkreis 20c weist einen Kondensator auf und dient zu Entkopplung der Eingangs- und Ausgangsstufe (Energiespeicher).DC for the DC link and vice versa (feedback path), while the output stage converts the DC into variable frequency AC and vice versa. The intermediate circuit 20c has a capacitor and is used for decoupling the input and output stage (energy storage).
Mit dieser Regelungseinrichtung ist eine Drehzahlverringerung (Rückspeisung der Energie ins Netz) aber auch eine Drehzahlerhöhung (zusätzliche Energiezufuhr) möglich. Dabei kann die Magnetisierung des Motors gezielt beeinflusst werden (auch als kapazitive Last gegenüber dem Netz darstellbar).With this control device is a speed reduction (recovery of energy into the grid) but also an increase in speed (additional power) possible. In this case, the magnetization of the motor can be influenced in a targeted manner (can also be represented as a capacitive load relative to the network).
Weiterhin kann ein Anlaufmodul 2Od vorgesehen werden, das aber nur dann notwendig ist, wenn der Antrieb 13, 14 unter Nennlast (oder darüber) anlaufen muss. Dann wird während des Anlaufs statt der Regeleinrichtung das Anlaufmodul 2Od an die Läuferwicklung geschaltet. Wird hingegen die Rollenmühle lastfrei (evtl. auf Teillast < 50% der Nennlast) gestartet, ist dieses Anlaufmodul nicht erforderlich.Furthermore, a start-up module 2Od can be provided, but this is only necessary if the drive 13, 14 has to start under rated load (or above). Then, during startup instead of the control device, the start-up module 20d is connected to the rotor winding. If, on the other hand, the roller mill is started without load (possibly at partial load <50% of rated load), this start-up module is not required.
In Fig. 3 ist die Regelungseinrichtung 20, 21 als Stromumrichterkaskade 20.2 ausgebildet. Es handelt sich dabei um eine untersynchrone Umrichterkaskade. Durch gezielte Strombeeinflussung lässt sich der Motorschlupf und damit die Drehzahl, bzw. das Motormoment des Antriebs gezielt beeinflussen. Dazu wird derIn Fig. 3, the control device 20, 21 is designed as Stromumrichterkaskade 20.2. It is a sub-synchronous converter cascade. Through targeted influence of current, the engine slip and thus the speed, or the engine torque of the drive can be specifically influenced. This is the
Läuferstrom über einen Gleichrichter 2Oe gleichgerichtet und über einer InduktivitätRotor current through a rectifier 2Oe rectified and over an inductance
2Of zwischengespeichert. Über eine Thyristorstufe 20g kann die Stromrichterkaskade Energie in das Netz zurückspeisen. Der Vorteil der Stromrichterkaskade besteht darin, dass ein Betrieb in der Nähe der Synchrondrehzahl für die Bauteile unproblematisch ist. Weiterhin kommt sie mit weniger Bauteilen als der Frequenzumrichter 20.1 aus, wobei insbesondere auf den Zwischenkreiskondensator verzichtet werden kann, wodurch sich die Lebensdauer erhöht.2Of cached. The power converter cascade can feed energy back into the network via a thyristor stage 20g. The advantage of the power converter cascade is that operation in the vicinity of the synchronous speed for the components is not a problem. Furthermore, it comes with fewer components than the frequency converter 20.1, in particular, can be dispensed with the DC link capacitor, thereby increasing the life.
Die Regeleinrichtung 20, 21 des in Fig. 4 dargestellten Ausführungsbeispieles wird durch einen Matrixumrichter 20.3 gebildet. Durch entsprechende Schaltelemente werden die frequenzfesten Eingangsphasen zeitrichtig so miteinander verschaltet, dass frequenzvariable Ausgangsspannungen bereit gestellt werden können. Dabei ist der Energiefluss in beiden Richtungen möglich. Der Vorteil eines Matrixumrichters besteht darin, dass keine Speicherbausteine (Kapazität oder Induktivität) notwendig sind. Auch hier ist ein Betrieb in der Nähe der Synchrondrehzahl für die Bauteile durch deren Betriebsweise unproblematisch. Darüber hinaus ist der Energiefluss ohne Zusatzbauteile in beide Richtungen möglich. Diese Regeleinrichtung dürfte daher gegenüber den anderen Ausführungsbeispielen einen besseren Wirkungsgrad aufweisen.The control device 20, 21 of the embodiment shown in Fig. 4 is formed by a matrix converter 20.3. By appropriate switching elements, the frequency-fixed input phases are time-correctly interconnected so that frequency-variable output voltages can be provided. The energy flow in both directions is possible. The advantage of a matrix converter is that no memory modules (capacitance or inductance) are necessary. Again, an operation in the vicinity of the synchronous speed for the components by their operation is not a problem. In addition, the energy flow is possible without additional components in both directions. This controller should therefore have a better efficiency over the other embodiments.
Fig. 5 zeigt schließlich noch eine schematische Darstellung einer mit der Läuferwicklung 13a, 14a mitrotierenden Regeleinrichtung 20, 21. Dies eröffnet dieFig. 5 finally shows a schematic representation of a co-rotating with the rotor winding 13a, 14a controller 20, 21. This opens the
Möglichkeit, den Energiefluss zum Beispiel über eine induktive Kopplung statt über Schleifringe zu übertragen. Es kann dadurch auf Schleifringe verzichtet werden.Possibility to transfer the energy flow, for example, via an inductive coupling instead of slip rings. It can be dispensed with slip rings.
Durch die Beeinflussung des Läuferstromes über die Regeleinrichtungen 20, 21 kann die erforderliche Leistung der Regeleinrichtungen in Abhängigkeit derBy influencing the rotor current via the control devices 20, 21, the required power of the control devices in dependence of
Drehzahlabweichung zwischen dem Betriebs- und Nennpunkt ausgelegt werden. Die erforderliche Leistung der Regeleinrichtung wird daher im Allgemeinen maximal 30% der Nennmotorleistung des Antriebes betragen.Speed deviation between the operating and nominal point are designed. The required power of the control device will therefore generally amount to a maximum of 30% of the rated motor power of the drive.
Während früher Rollenmühlen üblicherweise lediglich über den Mahlteller angetrieben wurden und dabei ein entsprechend groß ausgelegter Antrieb erforderlich war, können bei einem Einsatz von mehreren Antrieben auch Mittel- oder Niederspannungsmotoren zum Einsatz kommen, die deutlich geringere Verkabelungs- und Anschaltkosten erfordern. Durch die entsprechend geringere Leistung der Regelungseinrichtungen können außerdem auch Niederspannungsregeleinrichtungen zum Einsatz kommen, selbst wenn großeWhile previously roller mills were usually driven only on the grinding table and thereby a correspondingly large-sized drive required If multiple drives were used, medium or low-voltage motors could be used, which would require significantly lower cabling and connection costs. The correspondingly lower performance of the control devices also makes it possible to use low-voltage control devices, even if they are large
Motorleistungen zu regeln sind.Motor powers are to be regulated.
Damit ist es möglich den Mehrmotorenantrieb sicherer und kostengünstiger als den klassischen Einmotorenantrieb zu realisieren . Auch sind größ ere Mühlenantriebsleistungen ohne großen Aufwand denkbar. This makes it possible to realize the multi-motor drive safer and cheaper than the classic single-motor drive. Even larger mill drive services are conceivable without much effort.

Claims

Patentansprüche claims
1. Rollenmühle mit einem Mahlteller (10), wenigstens einer Mahlrolle (11, 12) sowie wenigstens zwei Antrieben (13, 14) mit Ständer- und Läuferwicklung (13a, 14a; 1 3 b , 1 4b) zum Antreiben der Rollenmühle und wenigstens einer1. Roller mill with a grinding table (10), at least one grinding roller (11, 12) and at least two drives (13, 14) with stator and rotor winding (13a, 14a; 1 3 b, 1 4b) for driving the roller mill and at least one
Regeleinrichtung (20, 21) zur Regelung des Motormomentes wenigstens eines Antriebs,Control device (20, 21) for controlling the engine torque of at least one drive,
dadurch gekennzeichnet, dass die Regeleinrichtung (20, 21) an die Läuferwicklung (13b, 14b) wenigstens eines Antriebes (13, 14) zurcharacterized in that the control device (20, 21) to the rotor winding (13b, 14b) of at least one drive (13, 14) for
Beeinflussung des Läuferstromes angeschlossen ist.Influencing the rotor current is connected.
2. Rollenmühle nach Anspruch 1, dadurch gekennzeichnet, dass die Antriebe (13, 14) durch Asynchronmotoren gebildet werden.2. Roller mill according to claim 1, characterized in that the drives (13, 14) are formed by asynchronous motors.
3. Rollenmühle nach Anspruch 1, dadurch gekennzeichnet, dass mindestens n-1 (n= Anzahl der Antriebe) Antriebe (13, 14) durch Schleifringmotoren gebildet werden.3. Roller mill according to claim 1, characterized in that at least n-1 (n = number of drives) drives (13, 14) are formed by slip ring motors.
4. Rollenmühle nach Anspruch 1, dadurch gekennzeichnet, dass die Leistung der4. Roller mill according to claim 1, characterized in that the power of
Regeleinrichtung (2) weniger als 50%, der Nennleistung des zugeordneten Antriebs (13, 14) beträgt.Control device (2) less than 50%, the rated power of the associated drive (13, 14) is.
5. Rollenmühle nach Anspruch 1, dadurch gekennzeichnet, dass die Leistung der Regeleinrichtung (2) vorzugsweise maximal 30%, der Nennleistung des zugeordneten Antriebs (13, 14) beträgt.5. Roller mill according to claim 1, characterized in that the power of the control device (2) is preferably at most 30%, the rated power of the associated drive (13, 14).
6. Rollenmühle nach Anspruch 1, dadurch gekennzeichnet, dass die Istwerte der Antriebe (13, 14) über ein mitlaufendes Motormodell gewonnen werden. 6. Roller mill according to claim 1, characterized in that the actual values of the drives (13, 14) are obtained via a follower motor model.
7. Rollenmühle nach Anspruch 1, dadurch gekennzeichnet, dass es sich bei der Regeleinrichtung (20, 21) um einen Frequenzumrichter (20.1) handelt.Roller mill according to claim 1, characterized in that the control device (20, 21) is a frequency converter (20.1).
8. Rollenmühle nach Anspruch 1, dadurch gekennzeichnet, dass es sich bei der Regeleinrichtung (20, 21) um eine Stromrichterkaskade (20.2) handelt.8. roller mill according to claim 1, characterized in that it is in the control device (20, 21) is a power converter cascade (20.2).
9. Rollenmühle nach Anspruch 1, dadurch gekennzeichnet, dass es sich bei der Regeleinrichtung (20, 21) um einen Matrixumrichter (20.3) handelt.9. roller mill according to claim 1, characterized in that it is in the control device (20, 21) to a matrix converter (20.3).
10. Rollenmühle nach Anspruch 1, dadurch gekennzeichnet, dass die10. Roller mill according to claim 1, characterized in that the
Regeleinrichtung (20, 21) mit dem Läufer des Antriebs mitrotiert.Control device (20, 21) co-rotated with the rotor of the drive.
11. Rollenmühle nach Anspruch 1, dadurch gekennzeichnet, dass es sich bei der Regeleinrichtung (20, 21) um ein Niederspannungssystem handelt.11. Roller mill according to claim 1, characterized in that it is in the control device (20, 21) is a low-voltage system.
12. Rollenmühle nach Anspruch 1, dadurch gekennzeichnet, dass die Spannung des Niederspannungssystems maximal 690V beträgt.12. Roller mill according to claim 1, characterized in that the voltage of the low-voltage system is a maximum of 690V.
13. Rollenmühle nach Anspruch 1, dadurch gekennzeichnet, dass die wenigstens eine Mahlrolle (11, 12) je einen und/oder der Mahlteller (10) mindestens einen zugeordneten Antrieb (13, 14) aufweisen.13. Roller mill according to claim 1, characterized in that the at least one grinding roller (11, 12) each have one and / or the grinding table (10) at least one associated drive (13, 14).
14. Verfahren zur Zerkleinerung von Mahlgut mit einer Rollenmühle, die einen Mahlteller (10), wenigstens eine Mahlrolle (11, 12), wenigstens zwei Antriebe (13, 14) mit Ständer- und Läuferwicklung (13a, 14a) zum Antreiben der14. A method for comminuting regrind with a roller mill comprising a grinding table (10), at least one grinding roller (11, 12), at least two drives (13, 14) with stator and rotor winding (13a, 14a) for driving the
Rollenmühle sowie wenigstens eine Regeleinrichtung (20, 21) zur Regelung des Motormomentes aufweist, wobei durch Regelung des Motormomentes wenigstens eines Antriebs eine Ausgleichsregelung durchgeführt wird,Roller mill and at least one control device (20, 21) for controlling the engine torque, wherein by controlling the engine torque of at least one drive a compensation control is performed,
dadurch gekennzeichnet, dass die Regeleinrichtung an die Läuferwicklung wenigstens eines Antriebes (13, 14) angeschlossen ist und die Regelung durch Beeinflussung des Stroms in der Läuferwicklung (13a, 14a) erfolgt, um die Leistung der Antriebe in einem vorgegebenen Verhältnis zueinander zu regeln.characterized in that the control device to the rotor winding of at least one drive (13, 14) is connected and the control by Influencing the current in the rotor winding (13a, 14a) takes place in order to regulate the power of the drives in a predetermined relationship to one another.
15. Verfahren nach Anspruch 14, dadurch gekennzeichnet, dass es sich bei der Ausgleichsregelung um eine Lastausgleichsregelung handelt.15. The method according to claim 14, characterized in that it is the balancing control is a load balancing control.
16. Verfahren nach Anspruch 14, dadurch gekennzeichnet, dass es sich bei der Ausgleichsregelung um eine Leistungsausgleichsregelung handelt.16. The method according to claim 14, characterized in that it is the compensation control to a power compensation control.
17. Verfahren nach einem der Ansprüche 14 bis 16, dadurch gekennzeichnet, dass die Drehzahl der Antriebe (13, 14) derart geregelt wird, dass zusätzlich eine vorgegebene Drehzahl des Mahltellers (10) aufrechterhalten wird. 17. The method according to any one of claims 14 to 16, characterized in that the rotational speed of the drives (13, 14) is controlled such that in addition a predetermined rotational speed of the grinding table (10) is maintained.
EP09736554.8A 2008-08-07 2009-07-30 Roller mill and method for size reduction of ground material Not-in-force EP2170517B2 (en)

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WO2010015564A1 (en) 2010-02-11
DE102008036784B4 (en) 2011-05-05
RU2497593C2 (en) 2013-11-10
DE102008036784A1 (en) 2010-02-18
DK2170517T3 (en) 2011-05-02
DK2170517T4 (en) 2016-11-07
ATE494068T1 (en) 2011-01-15
EP2170517B2 (en) 2016-07-20
CN102112232B (en) 2013-07-17
DE502009000272D1 (en) 2011-02-17
JP2011529787A (en) 2011-12-15
MX2011001213A (en) 2011-03-04
RU2011108266A (en) 2012-09-20
CN102112232A (en) 2011-06-29
BRPI0915954A2 (en) 2020-08-18
US20110121772A1 (en) 2011-05-26
US8692495B2 (en) 2014-04-08
EP2170517B1 (en) 2011-01-05
DE102008036784C5 (en) 2013-06-20

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