EP0658377A1 - Methods and devices for grinding solid material such as ores - Google Patents

Methods and devices for grinding solid material such as ores Download PDF

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Publication number
EP0658377A1
EP0658377A1 EP93403038A EP93403038A EP0658377A1 EP 0658377 A1 EP0658377 A1 EP 0658377A1 EP 93403038 A EP93403038 A EP 93403038A EP 93403038 A EP93403038 A EP 93403038A EP 0658377 A1 EP0658377 A1 EP 0658377A1
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EP
European Patent Office
Prior art keywords
cylinders
thrust
subjected
over time
pressure
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Granted
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EP93403038A
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German (de)
French (fr)
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EP0658377B1 (en
Inventor
Jean-Marc Maréchal
Michel Torneri
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BROYEURS POITTEMILL SA
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BROYEURS POITTEMILL SA
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Priority to EP93403038A priority Critical patent/EP0658377B1/en
Priority to DE69328252T priority patent/DE69328252D1/en
Priority to AT93403038T priority patent/ATE191158T1/en
Publication of EP0658377A1 publication Critical patent/EP0658377A1/en
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Publication of EP0658377B1 publication Critical patent/EP0658377B1/en
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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
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/32—Adjusting, applying pressure to, or controlling the distance between, milling members

Definitions

  • the present invention relates to a method and a device for grinding raw materials, such as ores, with a view to reducing these materials to an appropriate particle size level, in particular with a view to obtaining fines which can be used in the stages of further processing.
  • the invention applies more particularly to a method and a device using two parallel twin cylinders and rotating in opposite directions to one another.
  • the material is continuously discharged between the two cylinders and undergoes a crushing passage leading to the obtaining of a lower particle size.
  • the cylinders are subjected, during grinding, to stresses of various origins, since they depend mainly on factors specific to the ground materials. Firstly, the particle size, at the entrance to the grinding zone between the rolls, is variable over time. Secondly, the compressive strength of the various grains of the material being ground is variable over time, whether the grains are made of the same material, and a fortiori when the material is made of different materials, for example when the latter consists of a mixture intended for the manufacture of cement (clinker, limestone and gypsum).
  • the grinding device described in the patent application mentioned above comprises means capable of allowing the recoil of one of the cylinders.
  • This device is very advantageous since it allows the passage of the body stranger between the two cylinders without damaging them.
  • this faculty is limited to the displacement of the cylinder. In the presence of foreign bodies of relatively large size, this device in fact only allows to attenuate but not to annihilate the effect of the passage of said undesirable foreign body between the two cylinders.
  • the method and the device proposed according to the invention provide a solution to the problems mentioned above, and in particular makes it possible to avoid the consequences of the vibrations to which the two cylinders and the whole structure of the mill are subjected.
  • the method of grinding solid raw materials, such as ores in which said material is subjected to the compression action of two parallel compression cylinders rotating in opposite directions one of the other, and between which the material is entrained, is characterized in that the two said cylinders are mounted on movable axes parallel to each other, in that said axes are subjected to the thrust of less a pressure member and in that the thrust developed by said pressure member is controlled so as to vary over time the pressure of the two movable cylinders acting on the material.
  • the two said cylinders are each subjected to a thrust varying over time, according to different laws, such as for example sinusoidal laws.
  • the invention also relates to a device for grinding solid raw materials, such as ores, comprising two parallel compression cylinders rotating in opposite directions, and between which the material is entrained, characterized in that the two cylinders are mounted on movable axes and in that it comprises thrust means capable of subjecting the two said cylinders to a thrust varying over time.
  • the grinding device comprises a first cylinder 10 mounted on an axis 15 and a second cylinder 20 mounted on an axis 25.
  • the two cylinders 10 and 20 are parallel and have a rotational movement about their respective axis .
  • the directions of rotation of the two cylinders 10 and 20 are opposite, as indicated by the arrows in FIG. 1.
  • the means for driving the cylinders in rotation are known in themselves and are therefore not shown, for reasons of clarity.
  • the space between the two cylinders constitutes the grinding or compression zone, where high pressure prevails, where material to be ground is discharged by means of a hopper 3 arranged in the upper position relative to the cylinders and disposed at the right of the grinding area.
  • the hopper 3 is itself fed regularly and continuously by a conveyor 4 consisting of a conveyor belt.
  • the respective axes 15 and 25 of the first and second cylinders 10 and 20 are mounted on two end bearings 16 and 16 'for the first cylinder 10 and 26 and 26' for the second cylinder 20.
  • the end bearings are integral with rods bearing the respective references 17, 17 ', 27 and 27', said rods constituting a piston displaceable in their respective cylinder 18, 18 ', 28 and 28'.
  • Each of the jacks 18 and 18 ′ associated with the first cylinder 10 are supplied by a common pipe 19 from a first pressure source P1 and a second pressure P2 supplying the common pipe 19 via a distributor 31.
  • the jacks 28 and 28 ′ associated with the second cylinder 20 are supplied by a common pipe 29 connected to a pressure P1 and P2 via a distributor 30.
  • the pressures P1, P2, P'1 and P'2 are obtained by pressure generating means known in themselves and not shown.
  • the pressures P1 and P'1 are much higher than the pressures P2 and P'2.
  • the pressures P1 and P'1 correspond to a pressure exerted at the level of the cylinder 2 of the order of 500 to 800 kilograms per cm2.
  • the pressure P2 is considerably lower, even equal to atmospheric pressure.
  • the crushed material coming from the crushing zone arranged between the first and the second crushing cylinders 10 and 20, is optionally subjected to a second crushing operation by means of two rollers 40 and 41 parallel to each other. other and turning in reverse.
  • the material subjected to this second operation falls on a conveyor belt 42 for evacuation.
  • the axes 15 and 25 of the first and second cylinders 10 and 20 under the effect of the corresponding cylinders are subjected to forces such that they generate pressure at the level of the cylinders which vary over time between a value equivalent to atmospheric pressure, and maximum values of the order of 500 to 800 kilograms per cm2.
  • the variation over time of the pressures thus communicated to the cylinders 10 and 20 is produced by means of the distributors 30 and 31, constituted by register valves as shown in FIGS. 2a and 2b showing the register valve or distributor 30, being understood that the register valve or distributor 31 is similar to that shown in FIG. 2.
  • the sliding register 50 is capable of placing the common pipe 29, depending on its position, with the pressure P1 or the pressure P2.
  • the laws of variation over time of the first and second cylinders 10 and 20 can be the same. In a variant, the laws of variation in time respectively for the first and the second cylinder are different. Similarly, the pressures P1 and P'1 can be either equal or different, it is the same for the pressures P2 and P'2. It being understood that the pressures bearing index 2 are much higher than the pressures bearing index 1.
  • the pressure variations applied to the cylinders 10 and 20 respectively are preferably cyclic, according to a regular cycle or not. According to a preferred embodiment, the pressure variations are determined so that the pressure pulse applied to the two cylinders 10 and 20 counterbalances the forces due to the vibrations to which the two cylinders 10 and 20 are subjected.
  • the device according to the invention comprises means capable of measuring these vibrations, in the form of force, force, pressure or frequency, such that these vibrations are applied to the cylinders 10 and 20.
  • the data from these measurement means (not shown and known in themselves) supply, via a line 56 (see FIG. 1), control means 57 capable of acting, via control lines 58 and 59 respectively on distributors / registers 31 and 30 respectively.
  • the information relating to the vibrations and injected by the line 56 into the control means 57 makes it possible to control the movement of the sliding registers of the respective distributors 30 and 31, in order to place in communication the common hydraulic lines 19 and respectively 29, respectively with the pressures either P1 or P'1, either P2 or P'2.
  • the device advantageously comprises a feedback loop system, by means of the vibration measurement means and the control means 57, capable of subjecting the cylinders 10 and 20 to a pressure pulse such that it cancels at least partially vibrations.
  • the thrust can be equal on the two bearings of each cylinder, so that it is the frame-cylinder assembly (cylinder 10 or cylinder 20) which exerts a linear thrust in the grinding zone.
  • pulse frequency applied to the cylinders 10 and 20 is also advantageously a function of the material to be treated.
  • the pulses imparted to the bearings 26 and 26 ′ of the second cylinder 20 respectively are asynchronous. It is thus possible to obtain, by an appropriate phase shift, between the pulsation cycles printed on each of the pistons 27 and 27 ′, an effect of displacement of the point of maximum pressure along the generatrices of the cylinders 10 and 20 opposite.
  • any misalignment between the bearings of the same cylinder can be made up by the double action of the jacks on each cylinder.
  • the vibration absorption phenomenon is increased by the uncoupling of the two cylinders from the structure, because the two cylinders are mounted on movable axes.
  • the device is provided with means for detecting foreign bodies placed in the material, and not being liable to be compressed or crushed. Once the presence of such bodies has been detected, the supply lines 19 and 29 are placed in communication with the minimum pressure P1 or P'1, thus causing the separation of the two cylinders 10 and 20, thereby achieving an enlarged passage. for the said foreign body (s). This avoids any damage to the cylinders by said foreign bodies.
  • FIG. 3 A schematic diagram of a grinding circuit with roller mills, according to the invention, for the manufacture of cement, is shown in FIG. 3.
  • a final grinding is carried out in a ball mill 32, at the outlet of which the material is separated, for example in the separator 33.
  • the desired fines are removed at 34 , while the higher particle size passers are recycled upstream of the supply to the pulsed pressure cylinder mill as described above.
  • the intermediate particles are recycled through line 36 to the ball mill.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

- Method for grinding solid raw materials, such as ores, in which the material processed is subjected to the compressive action of a moving member able to compress this material against a bearing surface and in which two parallel compression rolls (1 and 2) of a known type are employed, rotating in opposite directions to each other, and between which the material is driven, one roll (1) being mounted on a fixed axle, the other roll (2) being mounted on a moving axle (5), remaining parallel to the first one, and this moving axle is subjected to the thrust of at least one pressing member (8, 8') and the method is further characterised in that the thrust developed by this pressing member is controlled so as to cause the pressure exerted by the moving roll on the material bearing against the roll of fixed axle to vary continuously. <IMAGE>

Description

La présente invention concerne un procédé et un dispositif pour le broyage de matières premières, tels que des minerais, en vue de la réduction de ces matériaux à un niveau de granulométrie approprié, notamment en vue de l'obtention de fines utilisables dans les étapes de traitement ultérieures.The present invention relates to a method and a device for grinding raw materials, such as ores, with a view to reducing these materials to an appropriate particle size level, in particular with a view to obtaining fines which can be used in the stages of further processing.

L'invention s'applique plus particulièrement à un procédé et un dispositif utilisant deux cylindres jumelés parallèles et tournant en sens inverse l'un de l'autre. La matière est déversée continûment entre les deux cylindres et subit au passage un écrasement aboutissant à l'obtention d'une granulométrie inférieure.The invention applies more particularly to a method and a device using two parallel twin cylinders and rotating in opposite directions to one another. The material is continuously discharged between the two cylinders and undergoes a crushing passage leading to the obtaining of a lower particle size.

On connaît de nombreuses installations et dispositifs de broyage fonctionnant d'après le principe général mentionné ci-dessus.Numerous grinding plants and devices are known which operate according to the general principle mentioned above.

Notamment on connaît, par la demande de brevet français no 90-04.474, un procédé et un dispositif utilisant deux cylindres parallèles tournant en sens inverse, l'un des cylindres étant monté sur un axe mobile et soumis à une poussée variable dans le temps.In particular is known by the French Patent Application No. 90-04474, a method and a device using two parallel cylinders rotating in opposite direction, one cylinder being mounted on a mobile axis and subjected to a thrust varying in time .

Ce dispositif donne entièrement satisfaction.This device is entirely satisfactory.

Cependant, il est susceptible d'améliorations.However, there is room for improvement.

Les cylindres, sont soumis, lors du broyage, à des sollicitations présentant diverses origines, puisqu'elles dépendent principalement de facteurs propres aux matériaux broyés. En premier lieu, la granulométrie, à l'entrée de la zone de broyage entre les cylindres, est variable dans le temps. En second lieu, la résistance à la compression des divers grains de la matière en cours de broyage est variable dans le temps, que les grains soient constitués de la même matière, et à fortiori lorsque la matière est constituée de matériaux différents, par exemple lorsque cette dernière est constituée d'un mélange destiné à la fabrication de ciment (clinker, calcaire et gypse).The cylinders are subjected, during grinding, to stresses of various origins, since they depend mainly on factors specific to the ground materials. Firstly, the particle size, at the entrance to the grinding zone between the rolls, is variable over time. Secondly, the compressive strength of the various grains of the material being ground is variable over time, whether the grains are made of the same material, and a fortiori when the material is made of different materials, for example when the latter consists of a mixture intended for the manufacture of cement (clinker, limestone and gypsum).

Ces sollicitations variables dans le temps provoquent des vibrations dans les cylindres et dans l'ensemble du broyeur. Ces vibrations sont extrêmement nuisibles aux cylindres et au broyeur car elles risquent d'entraîner la destruction rapide des paliers des axes des cylindres et des réducteurs d'entraînement des cylindres en rotation. Ces vibrations également sont la cause du phénomène d'écaillage de la couche de matériau dur constituant le revêtement des cylindres. Les vibrations sont transmises depuis les cylindres vers le palier de ce dernier puis sur le bâti qui transmet à son tour les vibrations à l'ensemble de la structure et des moyens d'entraînement (réducteur et moteur).These stresses, which vary over time, cause vibrations in the cylinders and in the whole mill. These vibrations are extremely harmful to the cylinders and to the crusher because they risk leading to the rapid destruction of the bearings of the axes of the cylinders and of the reducers for driving the rotating cylinders. These vibrations are also the cause of the phenomenon of flaking of the layer of hard material constituting the coating of the cylinders. The vibrations are transmitted from the cylinders to the bearing of the latter then to the frame which in turn transmits the vibrations to the entire structure and the drive means (reducer and motor).

Par ailleurs, en présence d'un corps étranger non susceptible d'être broyé, au sein de la matière, le dispositif de broyage décrit dans le demande de brevet mentionnée précédemment comprend des moyens aptes à permettre le recul de l'un des cylindres. Ce dispositif est très avantageux puisqu'il permet le passage du corps étranger entre les deux cylindres sans endommagement de ces derniers. Cependant, cette faculté est limitée au déplacement du cylindre. En présence de corps étrangers de relative grande taille, ce dispositif ne permet en fait que d'atténuer mais non pas d'annihiler l'effet du passage dudit corps étranger indésirable entre les deux cylindres.Furthermore, in the presence of a foreign body that cannot be ground, within the material, the grinding device described in the patent application mentioned above comprises means capable of allowing the recoil of one of the cylinders. This device is very advantageous since it allows the passage of the body stranger between the two cylinders without damaging them. However, this faculty is limited to the displacement of the cylinder. In the presence of foreign bodies of relatively large size, this device in fact only allows to attenuate but not to annihilate the effect of the passage of said undesirable foreign body between the two cylinders.

Le procédé et le dispositif proposés selon l'invention, apportent une solution aux problèmes mentionnés ci-dessus, et notamment permet d'éviter les conséquences des vibrations auxquelles sont soumis les deux cylindres et l'ensemble de la structure du broyeur.The method and the device proposed according to the invention provide a solution to the problems mentioned above, and in particular makes it possible to avoid the consequences of the vibrations to which the two cylinders and the whole structure of the mill are subjected.

A cette fin, selon l'invention, le procédé de broyage de matières premières solides, tels que des minerais, dans lequel on soumet ladite matière à l'action de compression de deux cylindres de compression parallèles tournant en sens inverse l'un de l'autre, et entre lesquels la matière est entraînée, est caractérisé en ce que les deux dits cylindres sont montés sur des axes mobiles parallèles l'un à l'autre, en ce que l'on soumet lesdits axes à la poussée d'au moins un organe de pression et en ce que la poussée développée par ledit organe de pression est contrôlée de façon à faire varier dans le temps la pression des deux cylindres mobiles s'exerçant sur la matière.To this end, according to the invention, the method of grinding solid raw materials, such as ores, in which said material is subjected to the compression action of two parallel compression cylinders rotating in opposite directions one of the other, and between which the material is entrained, is characterized in that the two said cylinders are mounted on movable axes parallel to each other, in that said axes are subjected to the thrust of less a pressure member and in that the thrust developed by said pressure member is controlled so as to vary over time the pressure of the two movable cylinders acting on the material.

De préférence, on soumet les deux dits cylindres chacun à une poussée variant dans le temps, selon des lois différentes, telles que par exemple des lois sinusoïdales.Preferably, the two said cylinders are each subjected to a thrust varying over time, according to different laws, such as for example sinusoidal laws.

L'invention concerne également un dispositif pour le broyage de matières premières solides, tels que des minerais, comportant deux cylindres de compression parallèles tournant en sens inverse l'un de l'autre, et entre lesquels la matière est entraînée, caractérisé en ce que les deux cylindres sont montés sur des axes mobiles et en ce qu'il comporte des moyens de poussée aptes à soumettre les deux dits cylindres à une poussée variant dans le temps.The invention also relates to a device for grinding solid raw materials, such as ores, comprising two parallel compression cylinders rotating in opposite directions, and between which the material is entrained, characterized in that the two cylinders are mounted on movable axes and in that it comprises thrust means capable of subjecting the two said cylinders to a thrust varying over time.

L'invention sera bien comprise à la lumière de la discription qui suit se référant au dessin annexé dans lequel :

  • La figure 1 représente une vue schématique et en perspective d'un dispositif à deux cylindres à pressions pulsées selon l'invention.
  • Les figures 2a et 2b représentent deux positions respectives d'un registre permettant le réglage de la variation de pression appliquée aux deux cylindres mobiles selon la figure 1 ; et
  • La figure 3 représente un schéma de réalisation d'une installation de broyage utilisant le dispositif selon l'invention.
The invention will be clearly understood in the light of the following description referring to the appended drawing in which:
  • FIG. 1 represents a schematic perspective view of a device with two pulsed pressure cylinders according to the invention.
  • Figures 2a and 2b show two respective positions of a register for adjusting the pressure variation applied to the two movable cylinders according to Figure 1; and
  • FIG. 3 represents a diagram of an embodiment of a grinding installation using the device according to the invention.

Le dispositif de broyage selon l'invention comprend un premier cylindre 10 monté sur un axe 15 et un deuxième cylindre 20 monté sur un axe 25. Les deux cylindres 10 et 20 sont parallèles et animés d'un mouvement de rotation autour de leur axe respectif. Les sens de rotation des deux cylindres 10 et 20 sont opposés, comme l'indique les flèches sur la figure 1. Les-moyens d'entraînement en rotation des cylindres sont connus en eux-mêmes et ne sont donc pas représentés, pour des raisons de clarté.The grinding device according to the invention comprises a first cylinder 10 mounted on an axis 15 and a second cylinder 20 mounted on an axis 25. The two cylinders 10 and 20 are parallel and have a rotational movement about their respective axis . The directions of rotation of the two cylinders 10 and 20 are opposite, as indicated by the arrows in FIG. 1. The means for driving the cylinders in rotation are known in themselves and are therefore not shown, for reasons of clarity.

L'espace entre les deux cylindres constitue la zone de broyage ou de compression, où règne une haute pression, où est déversée de la matière à broyer par l'intermédiaire d'une trémie 3 disposée en Position supérieure par rapport aux cylindres et disposée au droit de la zone de broyage.The space between the two cylinders constitutes the grinding or compression zone, where high pressure prevails, where material to be ground is discharged by means of a hopper 3 arranged in the upper position relative to the cylinders and disposed at the right of the grinding area.

La trémie 3 est elle-même alimentée de façon régulière et continue par un convoyeur 4 constitué d'un tapis roulant.The hopper 3 is itself fed regularly and continuously by a conveyor 4 consisting of a conveyor belt.

Les axes respectifs 15 et 25 des premier et second cylindres 10 et 20 sont montés sur deux paliers d'extrémité 16 et 16' pour le premier cylindre 10 et 26 et 26' pour le second cylindre 20. Les paliers d'extrémité sont solidaires de tiges portant les références respectives 17, 17', 27 et 27', lesdites tiges constituant un piston déplaçable dans leur vérin respectif 18, 18', 28 et 28'.The respective axes 15 and 25 of the first and second cylinders 10 and 20 are mounted on two end bearings 16 and 16 'for the first cylinder 10 and 26 and 26' for the second cylinder 20. The end bearings are integral with rods bearing the respective references 17, 17 ', 27 and 27', said rods constituting a piston displaceable in their respective cylinder 18, 18 ', 28 and 28'.

A noter que, pour des raisons de clarté, le vérin, la tige et le palier, du premier cylindre 10, vers l'arrière de la figure 1, ne sont pas représentés.Note that, for reasons of clarity, the jack, the rod and the bearing of the first cylinder 10, towards the rear of FIG. 1, are not shown.

Chacun des vérins 18 et 18' associés au premier cylindre 10 sont alimentés par une canalisation commune 19 depuis une première source de pression P1 et une seconde de pression P2 alimentant la conduite commune 19 par l'intermédiaire d'un distributeur 31.Each of the jacks 18 and 18 ′ associated with the first cylinder 10 are supplied by a common pipe 19 from a first pressure source P1 and a second pressure P2 supplying the common pipe 19 via a distributor 31.

De même, les vérins 28 et 28' associés au second cylindre 20 sont alimentés par une conduite commune 29 reliée à une pression P1 et P2 par l'intermédiaire d'un distributeur 30.Likewise, the jacks 28 and 28 ′ associated with the second cylinder 20 are supplied by a common pipe 29 connected to a pressure P1 and P2 via a distributor 30.

Les pressions P1, P2, P'1 et P'2 sont obtenues par des moyens générateurs de pression connus en eux-mêmes et non représentés.The pressures P1, P2, P'1 and P'2 are obtained by pressure generating means known in themselves and not shown.

A titre d'exemple, les pressions P1 et P'1 sont largement supérieures aux pressions P2 et P'2. Par exemple, les pressions P1 et P'1 correspondent à une pression exercée au niveau du cylindre 2 de l'ordre de 500 à 800 kilogrammes par cm2. La pression P2 est considérablement inférieure, voire égale à la pression atmosphérique.For example, the pressures P1 and P'1 are much higher than the pressures P2 and P'2. For example, the pressures P1 and P'1 correspond to a pressure exerted at the level of the cylinder 2 of the order of 500 to 800 kilograms per cm2. The pressure P2 is considerably lower, even equal to atmospheric pressure.

La matière broyée, issue de la zone de broyage disposée entre les premier et les second cylindres de broyage 10 et 20, est éventuellement soumise à une seconde opération de broyage par l'intermédiaire de deux rouleaux 40 et 41 parallèles l'un à l'autre et tournant en sens inverse. La matière soumise à cette seconde opération tombe sur un tapis roulant 42 d'évacuation.The crushed material, coming from the crushing zone arranged between the first and the second crushing cylinders 10 and 20, is optionally subjected to a second crushing operation by means of two rollers 40 and 41 parallel to each other. other and turning in reverse. The material subjected to this second operation falls on a conveyor belt 42 for evacuation.

Les axes 15 et 25 des premier et second cylindres 10 et 20 sous l'effet des vérins correspondants sont soumis à des forces telles qu'elles engendrent au niveau des cylindres des pressions variables dans le temps entre une valeur équivalente à la pression atmosphérique, et des valeurs maximales de l'ordre de 500 à 800 Kilogrammes par cm2. La variation dans le temps des pressions ainsi communiquées aux cylindres 10 et 20 est réalisée par l'intermédiaire des distributeurs 30 et 31, constitués de vannes à registre telles que représentées sur les figures 2a et 2b montrant la vanne à registre ou distributeur 30, étant entendu que la vanne à registre ou distributeur 31 est similaire à celle représentée sur la figure 2. Le registre coulissant 50 est susceptible de placer la conduite commune 29 , selon sa position, avec la pression P1 ou la pression P2. Ainsi, en fonction du mouvement du registre 50, la pression développée par chacun des vérins 28 et 28' et par conséquent reportée sur le second cylindre 20, varie. Il en est de même pour le premier cylindre 10.The axes 15 and 25 of the first and second cylinders 10 and 20 under the effect of the corresponding cylinders are subjected to forces such that they generate pressure at the level of the cylinders which vary over time between a value equivalent to atmospheric pressure, and maximum values of the order of 500 to 800 kilograms per cm2. The variation over time of the pressures thus communicated to the cylinders 10 and 20 is produced by means of the distributors 30 and 31, constituted by register valves as shown in FIGS. 2a and 2b showing the register valve or distributor 30, being understood that the register valve or distributor 31 is similar to that shown in FIG. 2. The sliding register 50 is capable of placing the common pipe 29, depending on its position, with the pressure P1 or the pressure P2. Thus, as a function of the movement of the register 50, the pressure developed by each of the jacks 28 and 28 'and consequently transferred to the second cylinder 20, varies. It is the same for the first cylinder 10.

En déplaçant le registre suivant une loi de dépassement déterminée dans le temps, cyclique ou non, il est possible de provoquer une pulsation de variation des pressions, par conséquent une pulsation dans l'effort de compression exercé par le second cylindre 20 sur la matière, et de même il est possible de provoquer une pulsation de variation des pressions dans l'effort de compression exercé par le premier cylindre 10. Les ensembles respectifs du premier cylindre 10 et du second cylindre 20 se trouvent ainsi respectivement soumis à une poussée et un effort de compression variable dans le temps.By moving the register according to a law of exceedance determined over time, cyclic or not, it is possible to cause a pulsation of variation in pressures, consequently a pulsation in the compressive force exerted by the second cylinder 20 on the material, and likewise it is possible to cause a pulsation of variation of the pressures in the compressive force exerted by the first cylinder 10. The respective assemblies of the first cylinder 10 and the second cylinder 20 are thus respectively subjected to a thrust and a compressive force variable over time.

Les lois de variation dans le temps des premier et second cylindres 10 et 20 peuvent être les mêmes. Dans une variante, les lois de variation dans le temps respectivement pour le premier et le second cylindre sont différentes. De même, les pressions P1 et P'1 peuvent être soit égales, soit différentes, il en est de même des pressions P2 et P'2. Etant entendu que les pressions portant indice 2 sont très supérieures aux pressions portant indice 1.The laws of variation over time of the first and second cylinders 10 and 20 can be the same. In a variant, the laws of variation in time respectively for the first and the second cylinder are different. Similarly, the pressures P1 and P'1 can be either equal or different, it is the same for the pressures P2 and P'2. It being understood that the pressures bearing index 2 are much higher than the pressures bearing index 1.

Les variations de pressions appliquées aux cylindres 10 et 20 respectivement, sont de préférence cycliques, selon un cycle régulier ou non. Selon un mode préféré de réalisation, les variations de pressions sont déterminées de manière que la pulsation de pression appliquée aux deux cylindres 10 et 20 contrebalance les forces dues aux vibrations auxquelles sont soumis les deux cylindres 10 et 20.The pressure variations applied to the cylinders 10 and 20 respectively, are preferably cyclic, according to a regular cycle or not. According to a preferred embodiment, the pressure variations are determined so that the pressure pulse applied to the two cylinders 10 and 20 counterbalances the forces due to the vibrations to which the two cylinders 10 and 20 are subjected.

A cet effet, le dispositif selon l'invention comprend des moyens aptes à mesurer ces vibrations, sous forme d'effort, de force, de pression ou de fréquence, tels que ces vibrations sont appliquées aux cylindres 10 et 20. Les données issues de ces moyens de mesure (non représentés et connus en eux mêmes) alimentent, par l'intermédiaire d'une ligne 56 (voir figure 1), des moyens de commande 57 susceptibles d'agir, par l'intermédiaire de lignes de commande 58 et 59 respectivement sur les distributeurs/registres respectivement 31 et 30.To this end, the device according to the invention comprises means capable of measuring these vibrations, in the form of force, force, pressure or frequency, such that these vibrations are applied to the cylinders 10 and 20. The data from these measurement means (not shown and known in themselves) supply, via a line 56 (see FIG. 1), control means 57 capable of acting, via control lines 58 and 59 respectively on distributors / registers 31 and 30 respectively.

Ainsi, l'information relative aux vibrations et injectée par la ligne 56 dans les moyens de commande 57, permet de commander le mouvement des registres coulissants des distributeurs respectifs 30 et 31, afin de placer en communication les lignes communes hydrauliques 19 et respectivement 29, respectivement avec les pressions soit P1 ou P'1, soit P2 ou P'2.Thus, the information relating to the vibrations and injected by the line 56 into the control means 57, makes it possible to control the movement of the sliding registers of the respective distributors 30 and 31, in order to place in communication the common hydraulic lines 19 and respectively 29, respectively with the pressures either P1 or P'1, either P2 or P'2.

Le dispositif comporte avantageusement un système de boucle à rétro-action, par l'intermédiaire des moyens de mesure des vibrations et du moyen de commande 57, susceptible de soumettre les cylindres 10 et 20 à une pulsation de pression telle qu'elle annulle au moins partiellement les vibrations.The device advantageously comprises a feedback loop system, by means of the vibration measurement means and the control means 57, capable of subjecting the cylinders 10 and 20 to a pressure pulse such that it cancels at least partially vibrations.

Dans une première forme de réalisation, la poussée peut être égale sur les deux paliers de chaque cylindre, de sorte que c'est l'ensemble bâti-cylindre (cylindre 10 ou cylindre 20) qui exerce une poussée linéaire dans la zone de broyage.In a first embodiment, the thrust can be equal on the two bearings of each cylinder, so that it is the frame-cylinder assembly (cylinder 10 or cylinder 20) which exerts a linear thrust in the grinding zone.

A noter que la fréquence de pulsation appliquée aux cylindres 10 et 20 est également avantageusement fonction du matériau à traiter.Note that the pulse frequency applied to the cylinders 10 and 20 is also advantageously a function of the material to be treated.

Dans une variante de réalisation, les pulsations imprimées aux paliers respectivement 26 et 26' du second cylindre 20 sont asynchrones. Il est ainsi possible d'obtenir par un décalage de phase approprié, entre les cycles de pulsation imprimés à chacun des pistons 27 et 27' un effet de déplacement du point de pression maximum le long des génératrices des cylindres 10 et 20 en regard.In an alternative embodiment, the pulses imparted to the bearings 26 and 26 ′ of the second cylinder 20 respectively are asynchronous. It is thus possible to obtain, by an appropriate phase shift, between the pulsation cycles printed on each of the pistons 27 and 27 ′, an effect of displacement of the point of maximum pressure along the generatrices of the cylinders 10 and 20 opposite.

On comprend, en effet, que si un palier, par conséquent une extrémité du cylindre, subit une poussée maximale, tandis que le palier opposé est à son niveau de poussée minimale, la pression maximale s'exercera entre les deux cylindres du côté du palier soumis à la pression maximale. Le cycle se poursuivant, le palier soumis à une pression maximale va voir décroître sa pression, tandis que le palier opposé va voir croître la poussée qu'il subit. Ainsi dans un instant extrêmement court, en fonction du cycle et de la fréquence des pulsations, le point ou la zone de pression maximale va se déplacer le long des cylindres depuis un palier jusqu'à l'autre, pour revenir au premier point. On provoque ainsi un gradient instantané de pression le long des deux cylindres et ce gradient évolue dans le temps de façon cyclique, de telle façon que la zone de haute pression suit une onde qui se déplace le long des deux cylindres. On provoque dans ces conditions, un effet maximal de détente de l'air emprisonné au niveau de chaque particule ou granule en cours de traitement. On provoque ainsi, grâce à un mouvement relativement lent des rouleaux, une accumulation de la pression suffisante, suivie d'une détente extrêmement rapide avec l'effet voulu d'éclatement et d'explosion des particules aboutissant à leur fragmentation, sans phénomène parasite de concrétion, et de réagglomération ultérieure.It is understood, in fact, that if a bearing, consequently one end of the cylinder, undergoes maximum thrust, while the opposite bearing is at its minimum thrust level, the maximum pressure will be exerted between the two cylinders on the side of the bearing subjected to the maximum pressure. The cycle continuing, the bearing subjected to a maximum pressure will see decreasing its pressure, while the opposite bearing will see increasing the thrust which it undergoes. Thus in an extremely short instant, depending on the cycle and the frequency of the pulses, the point or zone of maximum pressure will move along the cylinders from one level to the other, to return to the first point. This causes an instantaneous pressure gradient along the two cylinders and this gradient changes over time in a cyclical manner, so that the high pressure zone follows a wave which moves along the two cylinders. Under these conditions, a maximum relaxation effect of the air trapped at the level of each particle or granule during treatment is caused. This causes, thanks to a relatively slow movement of the rollers, an accumulation of sufficient pressure, followed by an extremely rapid expansion with the desired effect of bursting and explosion of the particles leading to their fragmentation, without parasitic phenomenon of concretion, and subsequent re-agglomeration.

Les avantages du dispositif selon l'invention par rapport à l'art antérieur sont notamment les suivants.The advantages of the device according to the invention compared to the prior art are in particular the following.

Les vibrations auxquelles sont soumis les cylindres 10 et 20, et notamment la structure, sont absorbées grâce aux pulsations de pression auxquels sont soumis lesdits cylindres, réalisant ainsi un effet d'amortissement.The vibrations to which the cylinders 10 and 20 are subjected, and in particular the structure, are absorbed by virtue of the pressure pulsations to which the said cylinders are subjected, thus achieving a damping effect.

Par ailleurs, tout écart d'alignement entre les paliers d'un même cylindre peut être rattrapé par la double action des vérins sur chaque cylindre.Furthermore, any misalignment between the bearings of the same cylinder can be made up by the double action of the jacks on each cylinder.

De plus, le phénomène d'absorption des vibrations est accru par le désaccouplement des deux cylindres par rapport à la structure, du fait que les deux cylindres sont montés sur des axes mobiles.In addition, the vibration absorption phenomenon is increased by the uncoupling of the two cylinders from the structure, because the two cylinders are mounted on movable axes.

Enfin, le dispositif est pourvu de moyens de détection de corps étrangers disposés dans la matière, et n'étant pas susceptibles d'être comprimés ou concassés. Une fois la présence de tels corps détectée, les conduites d'alimentation 19 et 29 sont mises en communication avec la pression minimale P1 ou P'1, provoquant ainsi l'écartement des deux cylindres 10 et 20, réalisant par là même un passage agrandi pour le ou lesdits corps étrangers. Ceci permet d'éviter tout endommagement aux cylindres par lesdits corps étrangers.Finally, the device is provided with means for detecting foreign bodies placed in the material, and not being liable to be compressed or crushed. Once the presence of such bodies has been detected, the supply lines 19 and 29 are placed in communication with the minimum pressure P1 or P'1, thus causing the separation of the two cylinders 10 and 20, thereby achieving an enlarged passage. for the said foreign body (s). This avoids any damage to the cylinders by said foreign bodies.

Un schéma de principe d'un circuit de broyage avec broyeurs à cylindres, selon l'invention, pour la fabrication du ciment, est représenté à la figure 3.A schematic diagram of a grinding circuit with roller mills, according to the invention, for the manufacture of cement, is shown in FIG. 3.

Après broyage par broyeur à cylindres à pression pulsée, selon l'invention, on effectue un broyage de finition dans un broyeur à boulet 32 , à la sortie duquel la matière est séparée par exemple dans le séparateur 33. Les fines recherchées sont évacuées en 34, tandis que les passants de granulométrie plus élevés sont recyclés en 35 en amont de l'alimentation du broyeur à cylindre à pression pulsée tel que décrit précédemment. Les particules intermédiaires sont recyclées par la ligne 36 vers le broyeur à boulet.After grinding by a pulsed pressure roller mill according to the invention, a final grinding is carried out in a ball mill 32, at the outlet of which the material is separated, for example in the separator 33. The desired fines are removed at 34 , while the higher particle size passers are recycled upstream of the supply to the pulsed pressure cylinder mill as described above. The intermediate particles are recycled through line 36 to the ball mill.

Claims (12)

Procédé de broyage de matières premières solides, tels que des minerais, dans lequel on soumet ladite matière à l'action de compression de deux cylindres de compression parallèles tournant en sens inverse l'un de l'autre, et entre lesquels la matière est entraînée, les deux dits cylindres étant montés sur des axes parallèles l'un à l'autre, l'un des axes étant monté mobile, l'un au moins des axes étant susceptible d'être soumis à la poussée d'au moins un organe de pression, caractérisé en ce que les deux cylindres sont montés sur des axes mobiles, en ce que l'on soumet lesdits axes à la poussée d'au moins un organe de pression, et en ce que la poussée développée dans ledit organe de pression est contrôlée de façon à faire varier dans temps la pression des deux cylindres mobiles.Method for grinding solid raw materials, such as ores, in which said material is subjected to the compression action of two parallel compression cylinders rotating in opposite directions, and between which the material is entrained , the two said cylinders being mounted on axes parallel to one another, one of the axes being mounted mobile, at least one of the axes being capable of being subjected to the thrust of at least one member pressure, characterized in that the two cylinders are mounted on movable axes, in that said axes are subjected to the thrust of at least one pressure member, and in that the thrust developed in said pressure member is controlled so as to vary the pressure of the two movable cylinders over time. Procédé selon la revendication 1,
caractérisé en ce que l'on soumet les deux dits cylindres chacun à une poussée variant dans le temps, selon des lois différentes.Method according to claim 1,
characterized in that the two said cylinders are each subjected to a thrust varying over time, according to different laws. Procédé selon l'une des revendications 1 ou 2,
caractérisé en ce que l'on soumet les deux dits cylindres à des poussées variant de façon cyclique dans le temps.Method according to one of claims 1 or 2,
characterized in that the two said cylinders are subjected to thrusts varying cyclically over time. Procédé selon la revendication 3,
caractérisé en ce que l'on soumet les deux dits cylindres à une poussée variant de façon sinusoïdale dans le temps.Method according to claim 3,
characterized in that the two said cylinders are subjected to a thrust varying sinusoidally over time. Procédé selon l'une des revendications 2 à 4,
caractérisé en ce que la variation dans le temps de la poussée est telle qu'elle s'oppose aux vibrations auxquelles sont soumis lesdits cylindres lors de la compression de ladite matière.Method according to one of claims 2 to 4,
characterized in that the variation over time of the thrust is such that it opposes the vibrations to which said cylinders are subjected during the compression of said material. Procédé selon la revendication 5,
caractérisé en ce que l'on mesure les vibrations et on engendre une pulsation de compression pour chaque cylindre de fréquence et de phase telle qu'elle s'oppose et/ou absorbe lesdites vibrations.Method according to claim 5,
characterized in that the vibrations are measured and a compression pulse is generated for each frequency and phase cylinder such that it opposes and / or absorbs said vibrations. Procédé selon l'une des revendications 1 à 6,
caractérisé en ce que l'on détecte la présence au sein de la matière de corps étrangers, susceptibles d'être broyés ou compressés, et, en cas de détection d'un ou plusieurs corps étrangers, on soumet au moins l'un des deux cylindres à une poussée sensiblement nulle.Method according to one of claims 1 to 6,
characterized in that one detects the presence within the material of foreign bodies, likely to be crushed or compressed, and, in the event of detection of one or more foreign bodies, one subjects at least one of the two cylinders at substantially zero thrust. Procédé selon la revendication 7,
caractérisé en ce que l'on soumet les deux cylindres à une poussée nulle, en vue de permettre au deux cylindres de se déplacer en direction opposée et donc de laisser le passage libre auxdits corps étrangers.Method according to claim 7,
characterized in that the two cylinders are subjected to zero thrust, in order to allow the two cylinders to move in opposite directions and therefore to allow free passage for said foreign bodies. Dispositif pour le broyage de matières premières solides, tels que des minerais, comportant deux cylindres de compression parallèles tournant en sens inverse l'un de l'autre, et entre lesquels la matière est entraînée, caractérisé en ce que les deux cylindres sont montés sur des axes mobiles et en ce qu'il comporte des moyens de poussée aptes à soumettre les deux dits cylindres à une poussée variant dans le temps.Device for grinding solid raw materials, such as ores, comprising two parallel compression cylinders rotating in opposite directions, and between which the material is entrained, characterized in that the two cylinders are mounted on movable axes and in that it comprises thrust means capable of subjecting the two said cylinders to a thrust varying over time. Dispositif selon la revendication 9,
caractérisé en ce que les moyens de poussée sont aptes à engendrer une poussée variable cycliquement dans le temps.Device according to claim 9,
characterized in that the thrust means are capable of generating a thrust which varies cyclically over time. Dispositif selon l'une des revendications 9 ou 10,
caractérisé en ce que la poussée varie de façon sinusoïdale avec le temps.Device according to one of claims 9 or 10,
characterized in that the thrust varies sinusoidally over time. Dispositif selon l'une des revendications 9 à 11,
caractérisé en ce que les moyens de poussée sont aptes à engendrer une poussée variable telle que cette dernière contrebalance les vibrations auxquelles sont soumis les deux dits cylindres.Device according to one of claims 9 to 11,
characterized in that the thrust means are capable of generating a variable thrust such that the latter counterbalances the vibrations to which the two said cylinders are subjected.
EP93403038A 1993-12-15 1993-12-15 Methods and devices for grinding solid material such as ores Expired - Lifetime EP0658377B1 (en)

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EP93403038A EP0658377B1 (en) 1993-12-15 1993-12-15 Methods and devices for grinding solid material such as ores
DE69328252T DE69328252D1 (en) 1993-12-15 1993-12-15 Method and device for comminuting solids, such as ores
AT93403038T ATE191158T1 (en) 1993-12-15 1993-12-15 METHOD AND DEVICE FOR GRINDING SOLIDS, SUCH AS ORES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP93403038A EP0658377B1 (en) 1993-12-15 1993-12-15 Methods and devices for grinding solid material such as ores

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103492079A (en) * 2011-04-26 2014-01-01 Khd洪保德韦达克有限公司 Method for regulating the roll gap pressure of a roller press
CN105618183A (en) * 2014-11-21 2016-06-01 重庆七彩虹化工有限公司 Transverse wave type tabletting crushing machine for powder coating

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR328710A (en) * 1903-01-22 1903-07-18 Jules Richard New adjustment mode for grinding or laminating rolls
EP0320853A2 (en) * 1987-12-18 1989-06-21 Krupp Polysius Ag Roller mill for milling within a bed of material
FR2660579A1 (en) * 1990-04-06 1991-10-11 Marechal Jean Marc Method for grinding solid raw materials, such as minerals

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR328710A (en) * 1903-01-22 1903-07-18 Jules Richard New adjustment mode for grinding or laminating rolls
EP0320853A2 (en) * 1987-12-18 1989-06-21 Krupp Polysius Ag Roller mill for milling within a bed of material
FR2660579A1 (en) * 1990-04-06 1991-10-11 Marechal Jean Marc Method for grinding solid raw materials, such as minerals

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103492079A (en) * 2011-04-26 2014-01-01 Khd洪保德韦达克有限公司 Method for regulating the roll gap pressure of a roller press
CN103492079B (en) * 2011-04-26 2016-01-06 Khd洪保德韦达克有限公司 For the method for the nip pressures of dancer rools press
CN105618183A (en) * 2014-11-21 2016-06-01 重庆七彩虹化工有限公司 Transverse wave type tabletting crushing machine for powder coating
CN105618183B (en) * 2014-11-21 2020-06-02 抚州中和科技有限公司 Powder coating transverse wave type tabletting crusher

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ATE191158T1 (en) 2000-04-15
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