EP0093192B1 - Method and device for controlling the working of a grinding apparatus - Google Patents

Method and device for controlling the working of a grinding apparatus Download PDF

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Publication number
EP0093192B1
EP0093192B1 EP82104768A EP82104768A EP0093192B1 EP 0093192 B1 EP0093192 B1 EP 0093192B1 EP 82104768 A EP82104768 A EP 82104768A EP 82104768 A EP82104768 A EP 82104768A EP 0093192 B1 EP0093192 B1 EP 0093192B1
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EP
European Patent Office
Prior art keywords
crusher
flow rate
feed
function
sensor
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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.)
Expired
Application number
EP82104768A
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German (de)
French (fr)
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EP0093192A1 (en
Inventor
Daniel Fontanille
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Stein Industrie SA
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Stein Industrie SA
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Publication date
Application filed by Stein Industrie SA filed Critical Stein Industrie SA
Priority to AT82104768T priority Critical patent/ATE22818T1/en
Publication of EP0093192A1 publication Critical patent/EP0093192A1/en
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Publication of EP0093192B1 publication Critical patent/EP0093192B1/en
Expired legal-status Critical Current

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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
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/1805—Monitoring devices for tumbling mills
    • 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 present invention relates to a method for adjusting the operation of an apparatus for grinding a material, in which the noise emitted by the apparatus and the feed rates of the apparatus and of the outgoing ground material are recorded, and the 'The material flow admitted into the device is adjusted. It also extends to a device for implementing this method.
  • the document FR-A-2 111 232 describes a process of this kind, in which the power absorbed by the mill is not measured.
  • the measurement of the engine torque is used to determine the flow rate of ground material discharged.
  • a regulator receiving the indications of the feed and discharge flow sensors is connected to the drive motor of the feed conveyor belt.
  • the zero point of this regulator can be modified according to the indication of a microphone recording the noise of the grinder. There is therefore only a single adjustment, which does not take into account the power absorbed by the mill.
  • Document US-A-2 381 351 describes a grinding process in which the feed rate is adjusted according to the noise emitted and the power consumed by the grinder, as well as the refusal of a screening device. There is only one setting, which does not take into account the flow rate of crushed material discharged.
  • the object of the present invention is to remedy these drawbacks, and to provide a method and a device for adjusting the operation of a grinding apparatus which is not very sensitive to changes in the properties of the material to be ground, and constantly ensures a yield of 1 grinding operation close to the optimal value.
  • It also aims to reduce the wear of the grinding bodies relative to the flow rate of crushed material to a minimum value and to provide the grinding device with a certain operating autonomy in the event of a temporary stop of its supply.
  • the method according to the invention is characterized in that the power absorbed by the apparatus is also recorded, and that a coarse rapid adjustment of the quantity of material in the mill is ensured as a function of the flow rates of incoming material and outgoing, and a slower fine adjustment as a function of these flow rates, of the noise emitted and of the power consumed by the apparatus, so as to maintain the quantity of material present in the latter at a constant high value, close to that for which the output of the mill is maximum.
  • the device according to the invention comprising a sensor of the noise emitted by the apparatus, a sensor of the flow of material introduced into the apparatus, a sensor of the flow of outgoing crushed material, and a member for adjusting the flow of material introduced into the device, is characterized in that it further comprises a sensor of the power absorbed by the device, a computer weighting the indications of the sensors into an overall signal of the quantity of material in the device, a regulator giving a signal for correcting the feed rate as a function of the overall signal from the computer and of a setpoint signal, and a comparator giving said feed rate adjustment member a quick but approximate order of correction of the feed rate , depending on the supply and discharge flow rates, and a slower, but more precise correction order, depending on the correction signal from the regulator.
  • the ball mill 1 with a rotating closed tank, of horizontal axis is supplied with coal to be ground by the conveyor belt 2, the motor rollers of which are driven by the electric motor 3, the speed of which is recorded by the tachometer 4.
  • the crusher is driven in rotation by the electric motor 5, by means of a pinion engaged on the ring gear 6.
  • the power absorbed by the motor 5 is recorded by the wattmeter 7.
  • a diaphragm 9 allows the measurement of the entrainment air flow, representative of the evacuation of charcoal flow, by means of the flow meter 10.
  • a member 11 for recording the noise level generated by the grinder is connected to the computer 12 by the link 11A.
  • This also receives via the link 4A the indication of the tachometer 4 of the drive motor for the treadmill supplying coal to be ground, by the link 7A that of the power absorbed, measured by the power meter 7, and by the 10A link that of the flowmeter 10 indicative of the flow of evacuated ground coal. It weights these different indications and draws a correction signal from them, which it transmits on the one hand by circuit 13 to regulator 14, on the other hand by circuit 15 to display devices of the power consumed and the quantity of coal present in the mill.
  • the regulator 14 compares the indication of the quantity of coal in the crusher transmitted by the computer 12 to a reference value, and draws from it a correction signal, which it transmits to the comparator 16.
  • the latter also receives by the circuit 17 the indication of the tachometer 4 , representative of the flow rate of material to be ground, and by the circuit 18 the indication of the flow meter 10, representative of the rate of ground material discharged. It draws from it a signal for correction of the feed rate of the coal mill, this signal generating a rapid, but approximate correction, if it comes from the comparison of the feed and discharge rates, and a slower correction, but more precise, if it comes from the comparator 14.
  • the correction signal is transmitted by the circuit 19 to the motor 3 for driving the conveyor belt supplying the mill.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Grinding (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)

Abstract

A method of regulating the operation of a material-crusher (1) in which the noise emitted by the crusher, the power absorbed thereby and the supply and removal flow rates of the material therein are detected. The flow rate (2) of the material fed into the crusher is regulated so as to maintain the quantity of material therein at a high and constant value close to that at which the efficiency of the crusher is at its best.

Description

La présente invention concerne un procédé de réglage du fonctionnement d'un appareil de broyage d'un matériau, dans lequel on enregistre le bruit émis par l'appareil et les débits d'alimentation de l'appareil et de matériau broyé sortant, et l'on règle le débit de matériau admis dans l'appareil. Elle s'étend en outre à un dispositif de mise en oeuvre de ce procédé.The present invention relates to a method for adjusting the operation of an apparatus for grinding a material, in which the noise emitted by the apparatus and the feed rates of the apparatus and of the outgoing ground material are recorded, and the 'The material flow admitted into the device is adjusted. It also extends to a device for implementing this method.

Le document FR-A-2 111 232 décrit un procédé de ce genre, dans lequel on ne mesure pas la puissance absorbée par le broyeur. La mesure du couple du moteur sert à déterminer le débit de matériau broyé évacué. Un régulateur recevant les indications des capteurs des débits d'alimentation et d'évacuation est relié au moteur d'entraînement de la bande transporteuse d'alimentation. Le point zéro de ce régulateur peut être modifié en fonction de l'indication d'un microphone enregistrant le bruit du broyeur. Il n'existe donc qu'un réglage unique, qui ne tient pas compte de la puissance absorbée par le broyeur.The document FR-A-2 111 232 describes a process of this kind, in which the power absorbed by the mill is not measured. The measurement of the engine torque is used to determine the flow rate of ground material discharged. A regulator receiving the indications of the feed and discharge flow sensors is connected to the drive motor of the feed conveyor belt. The zero point of this regulator can be modified according to the indication of a microphone recording the noise of the grinder. There is therefore only a single adjustment, which does not take into account the power absorbed by the mill.

Le document US-A-2 381 351 décrit un procédé de broyage dans lequel on règle le débit d'alimentation en fonction du bruit émis et de la puissance consommée par le broyeur, ainsi que du refus d'un appareil de criblage. Il n'existe qu'un réglage unique, qui ne tient pas compte du débit de matériau broyé évacué.Document US-A-2 381 351 describes a grinding process in which the feed rate is adjusted according to the noise emitted and the power consumed by the grinder, as well as the refusal of a screening device. There is only one setting, which does not take into account the flow rate of crushed material discharged.

Toutefois, ces deux procédés n'effectuent chacun qu'un réglage unique rapide, le microphone mentionné dans le document FR-A-2 111 232 ne servant qu'à fixer un degré de remplissage du broyeur désiré. Or le réglage du débit d'alimentation en fonction soit des seuls débits d'alimentation et d'évacuation, soit du bruit émis, de la puissance consommée et du refus d'un appareil de criblage ne procure pas nécessairement les meilleures conditions de fonctionnement quand les propriétés du matériau à broyer (granulométrie, friabilité, humidité, etc...) sont variables. On risque dans ce cas de ne pas obtenir le rendement optimal et une qualité constante du matériau broyé, qui peut l'être par moments insuffisamment ou au contraire de façon excessive.However, these two methods each perform only a single rapid adjustment, the microphone mentioned in document FR-A-2 111 232 only serving to fix a degree of filling of the desired mill. However, adjusting the feed rate as a function of only the feed and discharge rates, or of the noise emitted, the power consumed and the refusal of a screening device does not necessarily provide the best operating conditions when the properties of the material to be ground (grain size, friability, humidity, etc.) are variable. In this case, there is a risk of not obtaining the optimum yield and a constant quality of the ground material, which may be insufficient at times or, on the contrary, excessively.

La présente invention a pour but de remédier à ces inconvénients, et de procurer un procédé et un dispositif de réglage du fonctionnement d'un appareil de broyage qui soit peu sensible aux modifications des propriétés du matériau à broyer, et assure constamment un rendement de l'opération de broyage proche de la valeur optimale.The object of the present invention is to remedy these drawbacks, and to provide a method and a device for adjusting the operation of a grinding apparatus which is not very sensitive to changes in the properties of the material to be ground, and constantly ensures a yield of 1 grinding operation close to the optimal value.

Elle a encore pour but de réduire l'usure des corps broyants rapportée au débit de matériau broyé à une valeur minimale et de procurer à l'appareil de broyage une certaine autonomie de fonctionnement en cas d'arrêt momentané de son alimentation.It also aims to reduce the wear of the grinding bodies relative to the flow rate of crushed material to a minimum value and to provide the grinding device with a certain operating autonomy in the event of a temporary stop of its supply.

Le procédé selon l'invention est caractérisé en ce que l'on enregistre aussi la puissance absorbée par l'appareil, et ce que l'on assure un réglage rapide grossier de la quantité de matériau dans le broyeur en fonction des débits de matériau entrant et sortant, et un réglage fin plus lent en fonction de ces débits, du bruit émis et de la puissance consommée par l'appareil, de façon à maintenir la quantité de matériau présent dans ce dernier à une valeur élévée constante, proche de celle pour laquelle la rendement du broyeur est maximal.The method according to the invention is characterized in that the power absorbed by the apparatus is also recorded, and that a coarse rapid adjustment of the quantity of material in the mill is ensured as a function of the flow rates of incoming material and outgoing, and a slower fine adjustment as a function of these flow rates, of the noise emitted and of the power consumed by the apparatus, so as to maintain the quantity of material present in the latter at a constant high value, close to that for which the output of the mill is maximum.

Le dispositif selon l'invention, comprenant un capteur du bruit émis par l'appareil, un capteur du débit de matériau introduit dans l'appareil, un capteur du débit de matériau broyé sortant, et un organe de réglage du débit de matériau introduit dans l'appareil, est caractérisé en ce qu'il comprend en outre un capteur de la puissance absorbée par l'appareil, un ordinateur pondérant les indications des capteurs en un signal global de quantité de matériau dans l'appareil, un régulateur donnant un signal de correction du débit d'alimentation en fonction du signal global de l'ordinateur et d'un signal de consigne, et un comparateur donnant audit organe de réglage du débit d'alimentation un ordre de correction rapide, mais approximatif du débit d'alimentation, en fonction des débits d'alimentation et d'évacuation, et un ordre de correction plus lent, mais plus précis, en fonction du signal de correction issu du régulateur.The device according to the invention, comprising a sensor of the noise emitted by the apparatus, a sensor of the flow of material introduced into the apparatus, a sensor of the flow of outgoing crushed material, and a member for adjusting the flow of material introduced into the device, is characterized in that it further comprises a sensor of the power absorbed by the device, a computer weighting the indications of the sensors into an overall signal of the quantity of material in the device, a regulator giving a signal for correcting the feed rate as a function of the overall signal from the computer and of a setpoint signal, and a comparator giving said feed rate adjustment member a quick but approximate order of correction of the feed rate , depending on the supply and discharge flow rates, and a slower, but more precise correction order, depending on the correction signal from the regulator.

Il est décrit ci-après, à titre d'exemple et en référence à la figure unique du dessin annexé, un dispositif de réglage du fonctionnement d'un broyeur à charbon à boulets selon l'invention.It is described below, by way of example and with reference to the single figure of the accompanying drawing, a device for adjusting the operation of a coal ball mill according to the invention.

Dans la figure 1, le broyeur à boulets 1 à cuve fermée tournante, d'axe horizontal, est alimenté en charbon à broyer par le tapis roulant 2, dont les galets moteurs sont entraînés par le moteur électrique 3, dont la vitesse est enregistrée par le tachymètre 4. Le broyeur est entraîné en rotation par le moteur électrique 5, par l'intermédiaire d'un pignon en prise sur la couronne dentée 6. La puissance absorbée par le moteur 5 est enregistrée par le wattmètre 7.In FIG. 1, the ball mill 1 with a rotating closed tank, of horizontal axis, is supplied with coal to be ground by the conveyor belt 2, the motor rollers of which are driven by the electric motor 3, the speed of which is recorded by the tachometer 4. The crusher is driven in rotation by the electric motor 5, by means of a pinion engaged on the ring gear 6. The power absorbed by the motor 5 is recorded by the wattmeter 7.

Dans la tuyauterie d'évacuation du charbon pulvérisé, représentée schématiquement en 8, un diaphragme 9 permet la mesure du débit d'air d'entraînement, représentatif du débit de charbon évacué, grâce au débitmètre 10.In the pulverized coal evacuation pipe, shown diagrammatically at 8, a diaphragm 9 allows the measurement of the entrainment air flow, representative of the evacuation of charcoal flow, by means of the flow meter 10.

Par ailleurs, un organe 11 d'enregistrement du niveau de bruit engendré par le broyeur, appelé "oreille électrique", est relié à l'ordinateur 12 par la liaison 11A. Celui-ci reçoit aussi par la liaison 4A l'indication du tachymètre 4 du moteur d'eintraînement du tapis roulant d'alimentation en charbon à broyer, par la liaison 7A celle de la puissance absorbée, mesurée par le wattmètre 7, et par la liaison 10A celle du débitmètre 10 indicatif du débit de charbon broyé évacué. Il pondère ces différentes indications et en tire un signal de correction, qu'il transmet d'une part par le circuit 13 au régulateur 14, d'autre part par le circuit 15 à des organes d'affichage de la puissance consommée et de la quantité de charbon présente dans le broyeur.Furthermore, a member 11 for recording the noise level generated by the grinder, called an "electric ear", is connected to the computer 12 by the link 11A. This also receives via the link 4A the indication of the tachometer 4 of the drive motor for the treadmill supplying coal to be ground, by the link 7A that of the power absorbed, measured by the power meter 7, and by the 10A link that of the flowmeter 10 indicative of the flow of evacuated ground coal. It weights these different indications and draws a correction signal from them, which it transmits on the one hand by circuit 13 to regulator 14, on the other hand by circuit 15 to display devices of the power consumed and the quantity of coal present in the mill.

Le régulateur 14 compare l'indication de la quantité de charbon dans le broyeur transmise par l'ordinateur 12 à une valeur de référence, et en tire un signal de correction, qu'il transmet au comparateur 16. Celui-ci reçoit en outre par le circuit 17 l'indication du tachymètre 4, représentative du débit d'alimentation en matériau à broyer, et par le circuit 18 l'indication du débitmètre 10, représentative du débit de matériau broyé évacué. Il en tire un signal de correction du débit d'alimentation du broyeur en charbon, ce signal engendrant une correction rapide, mais approximative, s'il provient de la comparaison des débits d'alimentation et d'évacuation, et une correction plus lente, mais plus précise, s'il provient du comparateur 14. Le signal de correction est transmis par le circuit 19 au moteur 3 d'entraînement du tapis roulant d'alimentation du broyeur.The regulator 14 compares the indication of the quantity of coal in the crusher transmitted by the computer 12 to a reference value, and draws from it a correction signal, which it transmits to the comparator 16. The latter also receives by the circuit 17 the indication of the tachometer 4 , representative of the flow rate of material to be ground, and by the circuit 18 the indication of the flow meter 10, representative of the rate of ground material discharged. It draws from it a signal for correction of the feed rate of the coal mill, this signal generating a rapid, but approximate correction, if it comes from the comparison of the feed and discharge rates, and a slower correction, but more precise, if it comes from the comparator 14. The correction signal is transmitted by the circuit 19 to the motor 3 for driving the conveyor belt supplying the mill.

Bien que le dispositif qui vient d'être décrit en référence à la figure du dessin paraisse la forme de réalisation préférable de l'invention, on comprendra que diverses modifications peuvent lui être apportées sans sortir du cadre de l'invention, certains de ses organes pouvant être remplacés par d'autres qui joueraient un rôle technique analogue. En particulier, il peut être relié à des capteurs de variables liées aux propriétés du matériau à broyer. Il peut être utilisé avec de nombreux matériaux à broyer autres que le charbon.Although the device which has just been described with reference to the figure of the drawing appears to be the preferable embodiment of the invention, it will be understood that various modifications can be made to it without departing from the scope of the invention, certain of its organs can be replaced by others who would play a similar technical role. In particular, it can be connected to variable sensors linked to the properties of the material to be ground. It can be used with many grinding materials other than coal.

Claims (2)

1. A method for regulating the operation of material crusher, in which the noise emitted by the crusher and the material feed and material removal flow rates are registered and the flow rate of the material fed into the crusher is regulated, characterized in that the power absorbed by the crusher is also registered, and in that a rapid coarse regulation of the quantity of material present in the crusher is carried out as a function of the material feed and removal flow rates, and a slower fine regulation as a function of these flow rates, of the emitted noise and of the power absorbed by the crusher is effected, so as to maintain the quantity of material present in the latter at a high constant value, near that for which the best efficiency of the crusher is ensured.
2. A device for employing the method according to claim 1, comprising a sensor (11) for the noise emitted by the crusher, a sensor (4) for the flow rate of the material fed into the crusher, a sensor (10) for the flow rate of the removed crushed material, and an element (3) for regulating the flow rate of the material fed into the crusher, characterized in that it further comprises a sensor (7) for measuring the power absorbed by the crusher, a computer (12) weighting the indications of the sensors to form an overall signal of material quantity present in the crusher, a regulator (14) giving a correction signal of the feed flow rate as a function of the overall signal of the computer and of a set signal, and a comparator (16) giving to said element for regulating the feed flow rate an order for a rapid but coarse correction of the feed flow rate as a function of the feed and removal flow rates, and an order for a slower but more precise correction as a function of the correction signal issued by the regulator (14).
EP82104768A 1982-05-03 1982-06-01 Method and device for controlling the working of a grinding apparatus Expired EP0093192B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82104768T ATE22818T1 (en) 1982-05-03 1982-06-01 METHOD AND DEVICE FOR CONTROLLING THE OPERATION OF A SHREDDING MACHINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8207631 1982-05-03
FR8207631A FR2525922B1 (en) 1982-05-03 1982-05-03 METHOD AND DEVICE FOR ADJUSTING THE OPERATION OF A GRINDING APPARATUS

Publications (2)

Publication Number Publication Date
EP0093192A1 EP0093192A1 (en) 1983-11-09
EP0093192B1 true EP0093192B1 (en) 1986-10-15

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EP82104768A Expired EP0093192B1 (en) 1982-05-03 1982-06-01 Method and device for controlling the working of a grinding apparatus

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US (1) US4597535A (en)
EP (1) EP0093192B1 (en)
AT (1) ATE22818T1 (en)
DE (1) DE3273741D1 (en)
FR (1) FR2525922B1 (en)
ZA (1) ZA823904B (en)

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DK0665769T3 (en) * 1992-10-28 1997-08-11 Slegten Sa Method and apparatus for use in tubular, rotary ball mills or mills with other similar grinding tools
US6259222B1 (en) 1999-02-26 2001-07-10 Alan K. Kira Device and method for regulating maximum loading on an electric motor in an aggregate feed replenishing system
WO2006108178A2 (en) * 2005-04-07 2006-10-12 Rodriguez, Damian System and method for monitoring a vertical shaft impact crusher
CN103191826B (en) * 2013-04-09 2014-08-20 华北电力大学 Method for controlling coal quantity stored in ball grinding mill based on kinetic energy of steel ball
WO2016022663A2 (en) * 2014-08-07 2016-02-11 Emerson Electric (Us) Holding Corporation (Chile) Limitada Monitor and control of tumbling mill using measurements of vibration, electrical power input and mechanical power
CN109909022B (en) * 2019-04-18 2020-11-17 湖南山瑞重工科技有限公司 Automatic speed regulating system and method for ball mill
CN110947506A (en) * 2019-12-20 2020-04-03 华润电力技术研究院有限公司 Coal mill control method and equipment
CN111570072B (en) * 2020-05-07 2021-12-10 浙大宁波理工学院 Load control system and method of cement ball mill

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US4597535A (en) 1986-07-01
DE3273741D1 (en) 1986-11-20
ZA823904B (en) 1983-03-30
FR2525922A1 (en) 1983-11-04
FR2525922B1 (en) 1985-10-11
EP0093192A1 (en) 1983-11-09
ATE22818T1 (en) 1986-11-15

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