EP3159061A1 - Ring ball mill with improved monitoring - Google Patents
Ring ball mill with improved monitoring Download PDFInfo
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- EP3159061A1 EP3159061A1 EP15191255.7A EP15191255A EP3159061A1 EP 3159061 A1 EP3159061 A1 EP 3159061A1 EP 15191255 A EP15191255 A EP 15191255A EP 3159061 A1 EP3159061 A1 EP 3159061A1
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- Prior art keywords
- grinding
- ring
- ball
- pressure
- mill
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- 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
- B02C15/12—Mills with at least two discs or rings and interposed balls or rollers mounted like ball or roller bearings
- B02C15/123—Mills with at least two discs or rings and interposed balls or rollers mounted like ball or roller bearings with rings and interposed rollers
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- 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 ball mill with improved monitoring of Mahlkugelterrorism, and a corresponding method.
- Ball mill mills have a grinder, which consists of a plurality of grinding balls, which are guided between a Mahlring and a pressure ring in a Mahlspur.
- the grinding balls are set in motion by a difference in the rotational speeds of grinding and pressure ring.
- the pressure ring which is generally arranged at the top, serves to guide the grinding balls and transmits the grinding pressure built up by means of a hydraulic tensioning device or spring assemblies to the grinding balls.
- Ball ring mills are mainly used in the grinding of coarse-grained grinding material such as minerals, coal or gypsum. In particular, when used in large process plants considerable amounts of regrind can be enforced.
- the invention has for its object to provide an improved ball mill, which is more robust and less prone to blockages.
- a slip control system for the grinding balls is provided according to the invention, at the input of a arranged outside the grinding chamber sensor is connected to detect the ball and at the output at least one dynamically adjustable actuator is connected, which acts on the pressure ring and presses it against the guided on the Mahlring balls.
- the invention thus achieves that when the slip is detected, the pressure acting on the pressure balls via the pressure ring increases or decreases, so as to reduce or increase the slippage of the grinding ball.
- the slip deviation can be compensated.
- the ball ring mill is thus more robust with regard to its operating behavior. Fluctuations, in particular varying properties of the raw material supplied, can be better compensated. Overall, a more sensitive control of the ball ring mill is achieved, which not only improves the reliability, but also increases the quality of the issued ground material.
- the rotational speed of the drive is constant in the case of ball-type mills that are practically executed. Therefore, a measurement of the drive speeds is often unnecessary.
- the actual drive speed is detected and fed to the slip control system as a further input signal. This offers the advantage that valid values for the slip control system are always available even in dynamically changeable situations (in particular when starting up the ball ring mill). Particularly useful here is when as a signal for the speed the speed difference between Mahlring and pressure ring is used.
- the slip control system is preferably designed so that at a low ball circulation speed by lowering the pressure exerted by the pressure plate, the speed is increased and thus the slip is reduced.
- the sensor for detecting the ball circulation is preferably designed as an acoustic sensor which measures the sound generated by the movement of the grinding balls in the grinding mechanism.
- this sound measured by the acoustic sensor is evaluated by means of a frequency detector.
- the frequency detector is designed for performing a real-time Fourier analysis.
- the frequency spectrum obtained by the Fourier analysis reproduces the real ball circulation frequency of the grinding balls. This is a non-invasive and easy to order and wear-free way a measure of the real ball screw frequency available.
- the Fourier transform can be done in real time, so that even with dynamic changes in the speed of the grinding ball quickly a corresponding measurement signal is available, without having to wait for complete rounds.
- the invention thus provides an improved measuring signal for the recirculating ball frequency on the one hand robust but on the other hand also in a very dynamic manner.
- the Fourier analysis is preferably carried out as a discrete Fourier analysis. This offers the advantage of fast measured value processing, which in particular serves to achieve greater dynamics.
- the Fourier analysis is performed as a Fast Fourier Analysis (FFT). This also improves the dynamics of measured value acquisition.
- FFT Fast Fourier Analysis
- the acoustic sensor may be implemented as a conventional microphone. However, it can also be provided that the acoustic sensor is designed as a structure-borne sound sensor. The latter has the advantage that the structure-borne noise generated by the movements of the grinding balls in the grinder is measured directly, so that an impairment of the measurement is reduced by ambient noise.
- more than one structure-borne sound sensor is provided on the mill housing. This not only improves the acquisition of the measurement signal for structure-borne noise, since now two signals are available and thus increases the power of the desired signal so far.
- the provision of a second structure-borne sound detector also has the advantage that it creates a reference, whereby interference from external components, which are expected to act on both structure-borne sound sensors, can be more easily detected and taken into account in the subsequent processing of the measurement signals. Since structure-borne sound sensors are extremely inexpensive available and the location of their attachment to the mill housing is not critical, a considerable improvement in the quality of measurement is achieved in this way with little additional effort.
- a second correction circuit may be provided, which includes the slip meter and the drive.
- This correction circuit is designed in such a way that if the slip is too great, a correction signal is output to the drive for changing the rotational speed of the drive.
- This is expediently carried out in such a way that the rotational speed of the grinding ring is reduced in the event of too great a slip by lowering the drive speed.
- the balls no longer need to rotate so fast around the mill axis, whereby the slip is reduced.
- the ball mill according to the invention can be better adapted in changing operating conditions, in particular fluctuations in the amount of ground material supplied.
- the invention further extends to a corresponding method for monitoring the ball circulation.
- FIG Fig. 1 An embodiment of a ball mill according to the invention is shown schematically in FIG Fig. 1 shown.
- the ball ring mill 1 comprises a mill housing 10 with a grinder 2, which is arranged in a grinding chamber 11.
- the grinder 2 comprises a grinding ring 21, which is offset by a drive motor 23 in rotary motion.
- five grinding balls 3 are provided, of which three in the illustration in accordance with Fig. 1 are visible.
- a pressure ring 22 acts on the grinding balls 3, so that the grinding balls 3 are held between the pressure ring 22 and the grinding ring 21.
- the pressure ring 22 presses the grinding balls 3 into the grinding track 27 at the top of the grinding ring 21.
- the grinding ring 21 is rotated by the drive motor 23, and the grinding balls roll both on the grinding ring 21 and on the pressure ring 22 off. In the undisturbed state, they move approximately at half the differential rotational speed between pressure ring 22 and Mahlring 21. If, as in the illustrated embodiment, the pressure ring 22 stationary and only the Mahlring 21 driven, the Mahlkugeln 3 run at about half the rotational speed of the Mahlrings 22.
- the drive motor 23 is actuated by a control unit 25.
- the control unit 25 sets a number of revolutions n of Drive motor 23 and the grinding ring 21 a.
- the number of revolutions n of the grinding ring 21 is constant, but it is also possible for deviations ⁇ n to be predetermined.
- the pressure ring 21 is acted upon by the hydraulically operated pressure plate 24 with a force acting on Mahlring 21 force.
- the pressure plates 24 are actuators of a pressure control loop implemented in the pressure controller 26.
- an acoustic sound sensor 40 is provided. It is arranged outside at the height of the grinding balls 3 on the mill housing 10. However, the arrangement at this position is not mandatory, it may also be located at other locations, also outside the mill and be located, for example, at the position indicated by the reference numeral 40 'position.
- the acoustic sensor 40 receives the circulating noise caused by the grinding balls 3 in the mill housing 10.
- the signal measured by the acoustic sensor 40 is added to an evaluation unit 41.
- a module for a fast Fourier transformation (FFT) is implemented. This is expediently realized in the form of a discrete FFT, which is particularly suitable for implementation in a computer-aided system.
- a signal ⁇ for the recorded by the sound sensor 50 actual rotational frequency of the grinding balls 3 is output. This signal is applied to an input of a slip control system 5.
- a signal for the rotational speed n of the grinding ring 21 is applied.
- the number "5" stands for the number of grinding balls 3, which rotate on the grinding ring 21.
- the thus obtained signal s for the slippage of the grinding balls 3 is output by the arithmetic unit 51 and applied to the input of a control unit 52.
- the control unit 52 is designed to modify the pressure acting on the pressure plate 24 hydraulic pressure generated by a hydraulic unit 28 in response to the slip signal s.
- a servo valve 54 is arranged between the hydraulic unit 28 and the pressure plate 24, which is controlled by a control signal at the output of the control unit 52.
- the control unit 52 may be implemented as a P or PI controller. It is designed so that with increasing slip s the pressure acting on the pressure plate 24 hydraulic pressure is increased by means of the servo valve 54.
- the pressure plate 24 exert a greater compressive force on the pressure ring 22, so that the grinding balls 3 are pressed firmly against the grinding ring 21.
- a second correction circuit 6 may be provided, which includes its own speed correction unit 60. At an input of the speed correction unit 60 is also the signal s for the slip applied. It determines a need for a change in the rotational speed n with which the drive motor 23 drives the grinding ring 21. As a rule, this speed n should be kept constant and not be changed. However, in particular, if the slip deviates too much and the first correction circuit comprising the action on the pressure adjusting device 24 is no longer sufficient for correction, the correction member 60 can generate a speed correction signal ⁇ n which is applied to the drive control unit 25 as an additional input signal.
- the drive control unit 25 with the drive 23 of the grinding ring 21 can make a contribution to the stabilization of the slip s and thus to safe mill operation.
- a tolerance band member 62 is provided for the correction member 60 thereto. It is thereby achieved that, with slight slip, the first correction circuit alone operates via the pressure actuator 24, while in the case of greater slip, intervention is still effected by the second correction circuit 6 generating a speed change value ⁇ n for the speed control 25 of the drive motor 23.
- the acoustic sensor 40 may, for example, also be embodied as a structure-borne sound sensor. This can be arranged arbitrarily on the mill housing. A possible location is 40 'in place Fig. 1 shown. This stands by way of example for any desired location, in particular outside the actual plane of the grinding balls 3. Furthermore, it can also be provided that two or more acoustic sensors are arranged. In such a case, for example, an acoustic sensor 40 in the plane of the grinding balls 3 and another outside Mahlkugele be arranged, as symbolized by the reference numeral 40 '.
Abstract
Die Erfindung betrifft eine Kugelringmühle mit einem in einem Mühlengehäuse (10) angeordneten Mahlwerk (2), das in einem Mahlraum (11) eine Mehrzahl von Mahlkugeln (3) umfasst, die zwischen einem Mahlring (21) und einem Druckring (22) in einer Mahlspur (27) geführt sind, wobei ein Antrieb (23) die Mahlkugeln (3) aufgrund einer Differenz der Umdrehungsgeschwindigkeiten von Mahl- und Druckring (21, 22) entlang der Mahlspur (27) bewegt. Erfindungsgemäß ist ein Schlupfkontrollsystem (5) für die Mahlkugeln (3) vorgesehen, an dessen Eingang ein außerhalb des Mahlraums (11) angeordneter Sensor (40) zur Erfassung des Kugelumlaufs angeschlossen ist und an dessen Ausgang mindestens ein dynamisch verstellbarer Steller (24) angeschlossen ist, der auf den Druckring (22) wirkt und ihn gegen die auf dem Mahlring (21) geführten Mahlkugeln (3) presst. Bei erkanntem Schlupf wird so durch Einwirken auf den Steller (24) der über den Druckring (22) auf die Mahlkugeln (3) wirkende Druck erhöht beziehungsweise erniedrigt, um somit den Schlupf der Mahlkugel (3) zu verringern beziehungsweise zu erhöhen. Damit kann exzessiver Schlupf ausgeglichen werden. Durch die außenliegende Anordnung des Sensors (40) ist dieser vor den schädlichen, abrasiven Bedingungen im Mahlraum (11) geschützt. Die Kugelringmühle wird damit robuster bezüglich ihres Betriebsverhaltens. Insgesamt wird eine feinfühligere Regelung der Kugelringmühle erreicht, wodurch sich auch die Qualität des ausgegebenen Mahlguts erhöht.The invention relates to a ball mill with a grinder (2) arranged in a mill housing (10), which comprises a plurality of grinding balls (3) in a grinding space (11), which are arranged between a grinding ring (21) and a pressure ring (22) Milling track (27) are guided, wherein a drive (23) the grinding balls (3) due to a difference in the rotational speeds of the grinding and pressure ring (21, 22) along the Mahlspur (27) moves. According to the invention, a slip control system (5) for the grinding balls (3) is provided, at the input of which a sensor (40) arranged outside the grinding chamber (11) is connected for detecting the ball circulation and at whose output at least one dynamically adjustable actuator (24) is connected which acts on the pressure ring (22) and presses it against the grinding balls (3) guided on the grinding ring (21). When slip is detected, by acting on the actuator (24), the pressure acting on the grinding balls (3) via the pressure ring (22) is increased or decreased in order to reduce or increase the slip of the grinding ball (3). This can compensate for excessive slippage. Due to the external arrangement of the sensor (40) this is protected from the harmful, abrasive conditions in the grinding chamber (11). The ball ring mill is thus more robust with respect to their operating behavior. Overall, a more sensitive control of the ball ring mill is achieved, which also increases the quality of the issued ground material.
Description
Die Erfindung betrifft eine Kugelringmühle mit einer verbesserten Überwachung der Mahlkugelbewegung, sowie ein entsprechendes Verfahren.The invention relates to a ball mill with improved monitoring of Mahlkugelbewegung, and a corresponding method.
Kugelringmühlen weisen ein Mahlwerk auf, das aus einer Mehrzahl von Mahlkugeln besteht, die zwischen einem Mahlring und einem Druckring in einer Mahlspur geführt werden. Hierbei werden die Mahlkugeln in Bewegung gesetzt durch eine Differenz der Umdrehungsgeschwindigkeiten von Mahl-und Druckring. Durch den Lauf der Mahlkugeln auf den unteren Mahlring erfolgt eine Zerkleinerung des Mahlguts. Der in der Regel oben angeordnete Druckring dient zur Führung der Mahlkugeln und überträgt den mittels einer hydraulischen Spannvorrichtung oder Federpakets aufgebauten Mahldruck auf die Mahlkugeln. Kugelringmühlen kommen vorwiegend zum Einsatz beim Mahlen von grobkörnigen Mahlgut wie beispielsweise Mineralien, Kohle oder Gips. Insbesondere bei der Verwendung in großen Prozessanlagen können erhebliche Mengen von Mahlgut durchgesetzt werden. Ein robuster Betrieb wird hierbei erwartet. Dies gilt auch in Bezug auf schwankende Eigenschaften hinsichtlich des zugeführten Rohmaterials. Da es sich hierbei häufig um Naturmaterialien handelt, sind Schwankungen bezüglich der Materialeigenschaften häufig. So kann beispielsweise bei Gips der Feuchtigkeitsgehalt mitunter recht abrupt in relevantem Umfang variieren. Schwankungen in Bezug auf das zugeführte Rohmaterial können dazu führen, dass zu viel oder zu wenig zugeführtes Rohmaterial auf der Mahlbahn liegt, und die Mahlkugeln daher nicht mehr optimal auf der Mahlbahn abrollen können. So kann es bei zu hoher Zuführung von Rohmaterial oder bei zu stark abweichenden Eigenschaften, beispielsweise zu hohe Feuchtigkeit im Fall von Gips als Rohmaterial, zu einem Blockieren der Mahlkugeln kommen. Tritt dies auf, so kommt es zu einem Anstieg der Verweilzeiten, da die Kugelringmühle an Effizienz verliert. Für eine gleichmäßige Prozessführung, insbesondere nachgeschalteter Prozesse, ist das ausgesprochen ungünstig.Ball mill mills have a grinder, which consists of a plurality of grinding balls, which are guided between a Mahlring and a pressure ring in a Mahlspur. Here, the grinding balls are set in motion by a difference in the rotational speeds of grinding and pressure ring. Through the running of the grinding balls on the lower Mahlring crushing of the ground material is carried out. The pressure ring, which is generally arranged at the top, serves to guide the grinding balls and transmits the grinding pressure built up by means of a hydraulic tensioning device or spring assemblies to the grinding balls. Ball ring mills are mainly used in the grinding of coarse-grained grinding material such as minerals, coal or gypsum. In particular, when used in large process plants considerable amounts of regrind can be enforced. Robust operation is expected here. This also applies to fluctuating properties in terms of the raw material supplied. Since these are often natural materials, variations in material properties are common. For example, in the case of gypsum, the moisture content can sometimes vary quite abruptly to a relevant extent. Fluctuations in the raw material fed in can lead to too much or too little raw material being fed to the grinding path, which means that the grinding balls can no longer optimally roll on the grinding path. Thus, if the raw material is supplied too much or if the properties differ too greatly, for example excessively high humidity in the case of gypsum as the raw material, the grinding balls may become blocked. If this occurs, residence times increase as the ball mill loses efficiency. For a uniform process control, in particular downstream processes, this is extremely unfavorable.
Der Erfindung liegt die Aufgabe zugrunde, eine verbesserte Kugelringmühle zu schaffen, die robuster ist und weniger zu Blockierungen neigt.The invention has for its object to provide an improved ball mill, which is more robust and less prone to blockages.
Die erfindungsmäßige Lösung liegt in den Merkmalen der unabhängigen Ansprüche. Vorteilhafte Weiterbildungen sind Gegenstand der abhängigen Ansprüche.The inventive solution lies in the features of the independent claims. Advantageous developments are the subject of the dependent claims.
Bei einer Kugelringmühle mit einem in einem Mühlengehäuse angeordneten Mahlwerk, das in einem Mahlraum eine Mehrzahl von Mahlkugeln umfasst, die zwischen einem Mahlring und einem Druckring in einer Mahlspur geführt sind, wobei ein Antrieb die Mahlkugeln aufgrund einer Differenz der Umdrehungsgeschwindigkeiten von Mahl- und Druckring entlang der Mahlspur bewegt, ist erfindungsgemäß ein Schlupfkontrollsystem für die Mahlkugeln vorgesehen, an dessen Eingang ein außerhalb des Mahlraums angeordneter Sensor zur Erfassung des Kugelumlaufs angeschlossen ist und an dessen Ausgang mindestens ein dynamisch verstellbarer Steller angeschlossen ist, der auf den Druckring wirkt und ihn gegen die auf dem Mahlring geführten Mahlkugeln presst.In a ball mill with a arranged in a mill housing grinder comprising a plurality of grinding balls in a grinding chamber, which are guided between a Mahlring and a pressure ring in a Mahlspur, a drive along the grinding balls due to a difference in the rotational speeds of the grinding and pressure ring moves the Mahlspur, a slip control system for the grinding balls is provided according to the invention, at the input of a arranged outside the grinding chamber sensor is connected to detect the ball and at the output at least one dynamically adjustable actuator is connected, which acts on the pressure ring and presses it against the guided on the Mahlring balls.
Die Erfindung erreicht somit, dass bei erkanntem Schlupf durch Einwirken auf den Drucksteller der über den Druckring auf die Mahlkugeln wirkende Druck erhöht beziehungsweise erniedrigt wird, um so den Schlupf der Mahlkugel zu verringern beziehungsweise zu erhöhen. Damit kann die Schlupfabweichung ausgeglichen werden. Mit dem erfindungsgemäßen Schlupfkontrollsystem wird die Kugelringmühle damit robuster bezüglich ihres Betriebsverhaltens. Schwankungen, insbesondere variierende Eigenschaften des zugeführten Rohmaterials können besser ausgeglichen werden. Insgesamt wird eine feinfühligere Regelung der Kugelringmühle erreicht, wodurch sich nicht nur die Betriebssicherheit verbessert, sondern auch die Qualität des ausgegebenen Mahlguts erhöht. Indem der Sensor zur Erfassung des tatsächlichen Kugelumlaufs außerhalb des Mahlraums angeordnet ist, ist er nicht den kritischen, abrasiven Umgebungsbedingungen innerhalb des Mahlraums ausgesetzt. Damit ist der Sensor vor schädlichen Einflüssen geschützt und damit auch robust im Betrieb.The invention thus achieves that when the slip is detected, the pressure acting on the pressure balls via the pressure ring increases or decreases, so as to reduce or increase the slippage of the grinding ball. Thus, the slip deviation can be compensated. With the slip control system according to the invention, the ball ring mill is thus more robust with regard to its operating behavior. Fluctuations, in particular varying properties of the raw material supplied, can be better compensated. Overall, a more sensitive control of the ball ring mill is achieved, which not only improves the reliability, but also increases the quality of the issued ground material. By placing the sensor to detect the actual recirculating ball outside the grinding chamber, it is not exposed to the critical, abrasive environmental conditions within the grinding chamber. This protects the sensor against harmful influences and therefore also robust in operation.
Zumeist ist bei praktisch ausgeführten Kugelringmühlen die Drehzahl des Antriebs konstant. Von daher ist eine Messung der Antriebsdrehzahlen häufig entbehrlich. Es kann aber auch vorgesehen sein, dass die tatsächliche Antriebsdrehzahl erfasst und als weiteres Eingangssignal dem Schlupfkontrollsystem zugeführt wird. Das bietet den Vorteil, dass auch bei dynamisch veränderlichen Situationen (insbesondere beim Anfahren der Kugelringmühle) stets valide Werte für das Schlupfkontrollsystem zur Verfügung stehen. Besonders zweckmäßig ist hierbei, wenn als Signal für die Drehzahl die Drehzahldifferenz zwischen Mahlring und Druckring herangezogen ist.In most cases, the rotational speed of the drive is constant in the case of ball-type mills that are practically executed. Therefore, a measurement of the drive speeds is often unnecessary. However, it can also be provided that the actual drive speed is detected and fed to the slip control system as a further input signal. This offers the advantage that valid values for the slip control system are always available even in dynamically changeable situations (in particular when starting up the ball ring mill). Particularly useful here is when as a signal for the speed the speed difference between Mahlring and pressure ring is used.
Das Schlupfkontrollsystem ist vorzugsweise so ausgebildet, dass bei einer zu niedrigen Kugelumlaufgeschwindigkeit durch Absenkung des von dem Drucksteller ausgeübten Drucks die Geschwindigkeit gesteigert und damit der Schlupf reduziert wird. Damit kann eine Optimierung des Betriebs erreicht werden, und zwar Dank der durch die erfindungsgemäße Messung erreichten hohen Dynamik auch bei sich rasch ändernden Betriebszuständen.The slip control system is preferably designed so that at a low ball circulation speed by lowering the pressure exerted by the pressure plate, the speed is increased and thus the slip is reduced. Thus, an optimization of the operation can be achieved, thanks to the achieved by the measurement of the invention high dynamics even with rapidly changing operating conditions.
Vorzugsweise ist der Sensor zur Erfassung des Kugelumlaufs ausgebildet als ein akustischer Sensor, der den durch die Bewegung der Mahlkugeln im Mahlwerk erzeugten Schall misst. Vorzugsweise wird dieser vom akustischen Sensor gemessene Schall mittels eines Frequenzdetektors ausgewertet wird. Vorzugsweise ist der Frequenzdetektor hierzu ausgeführt zur Durchführung einer Echtzeit-Fourier-Analyse. Hierbei gibt das durch die Fourier-Analyse gewonnene Frequenzspektrum die reale Kugelumlauffrequenz der Mahlkugeln wieder. Damit steht auf nicht invasive und einfach anzuordnen sowie verschleißfreie Weise ein Maß für die reale Kugelumlauffrequenz zur Verfügung. Die Fourier-Transformation kann in Echtzeit erfolgen, sodass auch bei dynamischen Änderungen der Geschwindigkeit der Mahlkugel schnell ein entsprechendes Messsignal zur Verfügung steht, ohne vollständige Umläufe abwarten zu müssen. Die Erfindung stellt somit auf einerseits robuster aber andererseits auch auf ausgesprochen dynamische Weise ein verbessertes Messsignal für die Kugelumlauffrequenz zur Verfügung.The sensor for detecting the ball circulation is preferably designed as an acoustic sensor which measures the sound generated by the movement of the grinding balls in the grinding mechanism. Preferably, this sound measured by the acoustic sensor is evaluated by means of a frequency detector. Preferably, the frequency detector is designed for performing a real-time Fourier analysis. In this case, the frequency spectrum obtained by the Fourier analysis reproduces the real ball circulation frequency of the grinding balls. This is a non-invasive and easy to order and wear-free way a measure of the real ball screw frequency available. The Fourier transform can be done in real time, so that even with dynamic changes in the speed of the grinding ball quickly a corresponding measurement signal is available, without having to wait for complete rounds. The invention thus provides an improved measuring signal for the recirculating ball frequency on the one hand robust but on the other hand also in a very dynamic manner.
Die Fourier-Analyse ist vorzugsweise als eine diskrete Fourier-Analyse ausgeführt. Dies bietet den Vorteil einer schnellen Messwertverarbeitung, was insbesondere der Erreichung einer höheren Dynamik dient. Vorzugsweise ist die Fourier-Analyse als eine Fast-Fourier-Analyse (FFT) ausgeführt. Auch damit verbessert sich die Dynamik der Messwertgewinnung.The Fourier analysis is preferably carried out as a discrete Fourier analysis. This offers the advantage of fast measured value processing, which in particular serves to achieve greater dynamics. Preferably, the Fourier analysis is performed as a Fast Fourier Analysis (FFT). This also improves the dynamics of measured value acquisition.
Der akustische Sensor kann als ein herkömmliches Mikrofon ausgeführt sein. Es kann aber auch vorgesehen sein, dass der akustische Sensor als ein Körperschallsensor ausgeführt ist. Letzterer bietet den Vorteil, dass der durch die Bewegungen der Mahlkugeln im Mahlwerk erzeugte Körperschall direkt gemessen wird, sodass eine Beeinträchtigung der Messung durch Umgebungsgeräusche verringert ist.The acoustic sensor may be implemented as a conventional microphone. However, it can also be provided that the acoustic sensor is designed as a structure-borne sound sensor. The latter has the advantage that the structure-borne noise generated by the movements of the grinding balls in the grinder is measured directly, so that an impairment of the measurement is reduced by ambient noise.
Zweckmäßigerweise ist mehr als ein Körperschallsensor am Mühlengehäuse vorgesehen. Dies verbessert nicht nur die Gewinnung des Messsignals für den Körperschall, da nunmehr zwei Signale zur Verfügung stehen und sich damit die Leistung des Nutzsignals insoweit erhöht. Das Vorsehen eines zweiten Körperschalldetektors bietet ferner den Vorteil, dass damit eine Referenz geschaffen wird, wodurch Störeinflüsse von externen Komponenten, welche erwartungsgemäß auf beide Körperschallsensoren einwirken, leichter bei der anschließenden Verarbeitung der Messsignale erkannt und berücksichtigt werden kann. Da Körperschallsensoren ausgesprochen preisgünstig verfügbar sind und der Ort ihrer Anbringung am Mühlengehäuse unkritisch ist, wird auf diese Weise mit geringem Zusatzaufwand eine erhebliche Verbesserung der Messqualität erreicht.Appropriately, more than one structure-borne sound sensor is provided on the mill housing. This not only improves the acquisition of the measurement signal for structure-borne noise, since now two signals are available and thus increases the power of the desired signal so far. The provision of a second structure-borne sound detector also has the advantage that it creates a reference, whereby interference from external components, which are expected to act on both structure-borne sound sensors, can be more easily detected and taken into account in the subsequent processing of the measurement signals. Since structure-borne sound sensors are extremely inexpensive available and the location of their attachment to the mill housing is not critical, a considerable improvement in the quality of measurement is achieved in this way with little additional effort.
Zusätzlich oder alternativ kann ein zweiter Korrekturkreis vorgesehen sein, der das Schlupfmessgerät und den Antrieb umfasst. Dieser Korrekturkreis ist so ausgebildet, dass bei zu großem Schlupf ein Korrektursignal an den Antrieb ausgegeben wird zum Ändern der Umdrehungsgeschwindigkeit des Antriebs. Zweckmäßig erfolgt dies in der Weise, dass bei einem zu großem Schlupf durch Absenkung der Antriebsdrehzahl die Umdrehungsgeschwindigkeit des Mahlrings verringert wird. Dadurch brauchen die Kugeln nicht mehr so schnell um die Mühlenachse zu rotieren, wodurch der Schlupf verringert wird. Durch das Einwirken auf den Antrieb kann die erfindungsgemäße Kugelringmühle noch besser in wechselnden Betriebszustände, insbesondere Schwankungen hinsichtlich der zugeführten Menge an Mahlgut angepasst werden.Additionally or alternatively, a second correction circuit may be provided, which includes the slip meter and the drive. This correction circuit is designed in such a way that if the slip is too great, a correction signal is output to the drive for changing the rotational speed of the drive. This is expediently carried out in such a way that the rotational speed of the grinding ring is reduced in the event of too great a slip by lowering the drive speed. As a result, the balls no longer need to rotate so fast around the mill axis, whereby the slip is reduced. By acting on the drive, the ball mill according to the invention can be better adapted in changing operating conditions, in particular fluctuations in the amount of ground material supplied.
Die Erfindung erstreckt sich ferner auf ein entsprechendes Verfahren zur Überwachung des Kugelumlaufs.The invention further extends to a corresponding method for monitoring the ball circulation.
Die Erfindung wird nachfolgend unter Bezugnahme auf die beigefügte Zeichnung beispielhaft erläutert. Es zeigen:
- Fig. 1:
- eine schematische Ansicht eines Ausführungsbeispiels einer erfindungsgemäßen Kugelringmühle;
- Fig. 2:
- ein Blockschaltbild zu einem Schlupfkontrollsystem gemäß dem Ausführungsbeispiel;
- Fig. 3 a,b:
- Signalkurven eines akustischen Sensors und deren Darstellung als Frequenzspektrum; und
- Fig. 4 a-d:
- Diagramme zu einigen Betriebsparametern der Erfindung.
- Fig. 1:
- a schematic view of an embodiment of a ball mill according to the invention;
- Fig. 2:
- a block diagram of a slip control system according to the embodiment;
- 3 a, b:
- Signal curves of an acoustic sensor and their representation as a frequency spectrum; and
- Fig. 4 ad:
- Diagrams of some operating parameters of the invention.
Ein Ausführungsbeispiel für eine erfindungsgemäße Kugelringmühle ist schematisch in
Der Antriebsmotor 23 ist von einer Steuereinheit 25 betätigt. Die Steuereinheit 25 stellt eine Umdrehungszahl n des Antriebsmotors 23 beziehungsweise des Mahlrings 21 ein. Meist ist die Umdrehungszahl n des Mahlrings 21 konstant, es können aber auch Abweichungen Δn vorgegeben sein. Der Druckring 21 wird durch die hydraulisch betätigten Drucksteller 24 mit einer zum Mahlring 21 wirkenden Kraft beaufschlagt. Die Drucksteller 24 sind Stellglieder eines Druckregelkreises, der in dem Drucksteuergerät 26 implementiert ist.The
Erfindungsgemäß vorgesehen ist ein akustischer Schallsensor 40. Er ist auf Höhe der Mahlkugeln 3 außen am Mühlengehäuse 10 angeordnet. Die Anordnung an dieser Position ist jedoch nicht zwingend, er kann auch an anderen Orten, auch außerhalb der Mühleneben angeordnet sein und beispielsweise an der durch die Bezugsziffer 40' kenntlich gemachten Position. Der akustische Sensor 40 nimmt das durch die Mahlkugeln 3 verursachte Umlaufgeräusch im Mühlengehäuse 10 auf. Das von dem akustischen Sensor 40 gemessene Signal wird einer Auswerteeinheit 41 hinzugeführt. In dieser ist ein Modul für eine schnelle Fourier-Transformation (FFT) implementiert. Zweckmäßigerweise ist dies in Gestalt einer diskreten FFT realisiert, die sich insbesondere zur Implementierung in einem rechnergestützten System eignet. Am Ausgang der Auswerteeinheit 41 ist ein Signal ω für die vom Schallsensor 50 aufgenommene tatsächliche Umlauffrequenz der Mahlkugeln 3 ausgegeben. Dieses Signal ist angelegt an einen Eingang eines Schlupfkontrollsystems 5. An einem weiteren Eingang des Schlupfkontrollsystems 5 ist ein Signal für die Drehzahl n des Mahlrings 21 angelegt. Eine Recheneinheit 51 des Schlupfkontrollsystems 5 bestimmt aus den angelegten Werten für die Umlauffrequenz ω der Mahlkugeln 3 einerseits und der Umdrehungsdrehzahl n des Mahlrings (in Umdrehungen pro Minute) andererseits den tatsächlich auftretenden Schlupf s gemäß der Beziehung:
Abgesehen von dem durch die Regeleinheit 52 gebildeten ersten Korrekturkreis kann ein zweiter Korrekturkreis 6 vorgesehen sein, der eine eigene Drehzahlkorrektureinheit 60 umfasst. An einem Eingang der Drehzahlkorrektureinheit 60 ist ebenfalls das Signal s für den Schlupf angelegt. Sie ermittelt hieraus ein Bedarf für eine Änderung der Drehzahl n mit welcher der Antriebsmotor 23 den Mahlring 21 antreibt. Im Regelfall soll diese Drehzahl n konstant gehalten sein und nicht geändert werden. Jedoch kann dann, wenn insbesondere der Schlupf zu stark abweicht und der erste Korrekturkreis umfassend das Einwirken auf die Druckstelleinrichtung 24 nicht mehr zur Korrektur ausreicht, von dem Korrekturglied 60 ein Drehzahlkorrektursignal Δn erzeugt werden welches als zusätzliches Eingangssignal an die Antriebssteuereinheit 25 angelegt ist. Auf diese Weise kann auch die Antriebssteuereinheit 25 mit dem Antrieb 23 des Mahlrings 21 einen Beitrag zur Stabilisierung des Schlupfes s und damit zum sicheren Mühlenbetriebs leisten. Zweckmäßigerweise ist bei dem Korrekturglied 60 dazu ein Toleranzbandglied 62 vorgesehen. Damit wird erreicht, dass bei geringem Schlupf alleine der erste Korrekturkreis über den Drucksteller 24 arbeitet, während bei größerem Schlupf zusätzlich noch eingegriffen wird durch den zweiten Korrekturkreis 6 mit Erzeugen eines Drehzahländerungswerts Δn für die Drehzahlsteuerung 25 des Antriebsmotors 23.Apart from the first correction circuit formed by the
Es sei angemerkt, dass der akustische Sensor 40 beispielsweise auch als ein Körperschallsensor ausgeführt sein kann. Dieser kann an sich beliebig an dem Mühlengehäuse angeordnet sein. Ein möglicher Ort ist als Ort 40' in
Die Wirkungsweise der Erfindung wird anhand der
Um dies zu vermeiden, ist die erfindungsgemäße Wirkung mittels durchgezogener Linien dargestellt. Wiederum steigt zum Zeitpunkt t=t0 die Feuchtigkeit der zugeführten Kohle 9 als Mahlgut sprunghaft an. Initial steigt ebenfalls der Schlupf s an, dies wird jedoch von dem erfindungsgemäßen Schlupfkontrollsystem 5 erkannt und es erfolgt nach kurzer Zeit eine Erhöhung des auf die Drucksteller 24 wirkenden Hydraulikdrucks pD, wie in
Claims (12)
dadurch gekennzeichnet, dass
ein Schlupfkontrollsystem (5) für die Mahlkugeln (3) vorgesehen ist, an dessen Eingang ein außerhalb des Mahlraums angeordneter Sensor (40) zur Erfassung des Kugelumlaufs und an dessen Ausgang mindestens ein dynamisch verstellbarer Steller (24) angeordnet ist, der auf den Druckring (22) wirkt und ihn gegen die auf dem Mahlring (21) geführten Mahlkugeln 3 presst.Ball mill with a grinder (2) arranged in a mill housing (10), which comprises in a grinding chamber (11) a plurality of grinding balls (3) arranged between a grinding ring (21) and a pressure ring (22) in a grinding track (27). are guided, wherein a drive (23) moves the grinding balls (3) due to a difference in the rotational speeds of the grinding and pressure ring (21, 22),
characterized in that
a slip control system (5) for the grinding balls (3) is provided, at the input of which a sensor (40) arranged outside the grinding chamber for detecting the ball circulation and at whose output at least one dynamically adjustable actuator (24) is arranged, which is placed on the pressure ring ( 22) acts and presses it against the grinding balls 3 guided on the grinding ring (21).
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EP15191255.7A EP3159061B1 (en) | 2015-10-23 | 2015-10-23 | Ring ball mill with improved monitoring |
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EP3159061B1 EP3159061B1 (en) | 2018-03-28 |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001006207A1 (en) * | 1999-07-19 | 2001-01-25 | Eskom | Monitoring arrangement for a wear part |
JP3439800B2 (en) * | 1993-09-14 | 2003-08-25 | バブコック日立株式会社 | Mill and its operation method |
EP2075072A1 (en) * | 2007-12-27 | 2009-07-01 | Claudius Peters Technologies GmbH | Device and method for monitoring the movement of a grinding ball in a ring ball mill |
-
2015
- 2015-10-23 EP EP15191255.7A patent/EP3159061B1/en not_active Not-in-force
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3439800B2 (en) * | 1993-09-14 | 2003-08-25 | バブコック日立株式会社 | Mill and its operation method |
WO2001006207A1 (en) * | 1999-07-19 | 2001-01-25 | Eskom | Monitoring arrangement for a wear part |
EP2075072A1 (en) * | 2007-12-27 | 2009-07-01 | Claudius Peters Technologies GmbH | Device and method for monitoring the movement of a grinding ball in a ring ball mill |
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