EP0215865B1 - Procede d'ajustement des cylindres broyeurs des moulins a cylindres d'une installation de mouture de cereales, installations de mouture de cereales utilisant ce procede - Google Patents

Procede d'ajustement des cylindres broyeurs des moulins a cylindres d'une installation de mouture de cereales, installations de mouture de cereales utilisant ce procede Download PDF

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Publication number
EP0215865B1
EP0215865B1 EP86901845A EP86901845A EP0215865B1 EP 0215865 B1 EP0215865 B1 EP 0215865B1 EP 86901845 A EP86901845 A EP 86901845A EP 86901845 A EP86901845 A EP 86901845A EP 0215865 B1 EP0215865 B1 EP 0215865B1
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Prior art keywords
computer
milling
values
process according
grain
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EP86901845A
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German (de)
English (en)
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EP0215865A1 (fr
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Christian Lippuner
Werner Baltensperger
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Buehler AG
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Buehler AG
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Priority claimed from DE19853519625 external-priority patent/DE3519625A1/de
Application filed by Buehler AG filed Critical Buehler AG
Priority to AT86901845T priority Critical patent/ATE50163T1/de
Publication of EP0215865A1 publication Critical patent/EP0215865A1/fr
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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 invention relates to a method for adjusting the grinding roller spacing of roller mills with a downstream screening system in a grain mill system, in which in selected key passages a measurement signal representing an actual value is tapped, fed to a computer, compared there with a stored target value and if the actual value differs from A control signal is generated.
  • the invention also relates to a grain mill system with a series of roller mills and downstream plan sifters, with controllable drive means for adjusting the roller spacing, with measuring devices for measuring actual values of operating parameters and with a central computer with data memory for monitoring the actual values of selected key passages, for their comparison with corresponding ones , setpoints stored in the data memory and for generating control signals in the event of deviations between actual and setpoints.
  • the invention is based on the object of improving a control method of the type mentioned in such a way that, with greatly reduced effort, an almost fully automatic operation with full functionality and without risk of rocking is made possible, and a mill system for carrying it out propose such a procedure.
  • this is achieved in a method of the type mentioned at the outset by selecting the repulsion or the diarrhea of the screen systems as actual and target values and using the control signal for specifying new setting values for the roller spacings.
  • the object is achieved in that the measuring device is a continuous weight measuring system downstream of the pian classifiers for the continuous detection of sieve rejection or sieve diarrhea, and the control output of the computer is connected to a setpoint memory for specifying new setting values for the drive means is
  • the measures according to the invention increase the ease of use, while at the same time the actual control of the overall control is left to the miller. This can initially prevent the entire mill run from "vibrating", i.e. that rocking occurs, which is a relatively great danger in many interventions. The really necessary interventions can be reduced to a minimum and carried out by an experienced operator.
  • one or more corrections for the control specification can only be carried out within the framework of an overall overview, since all actual values, including those of the key passages, can be displayed centrally at any time and an intervention can be carried out in a very targeted manner, without any predetermined fixed correction program being executed ought to. If an error actually occurs, the biggest error can be easily eliminated first and then the subsequent errors.
  • the method according to the invention makes use of the surprising finding that when using the measurement results, only a few selected key passages and their processing in one Downstream computers can achieve largely automated control of the grinding roller spacing in a grain mill system without an extraordinarily large number of further measurement results having to be evaluated by correspondingly complicated computer programs, because a deliberate intervention possibility of the upper miller is deliberately planned.
  • the measured values determined with the measuring device can be determined from product properties without the occurrence of a disturbance variable, with the accuracy of measured values from the scales. Nevertheless, they offer the advantage of a continuous measuring process, similar to that of a belt scale.
  • the main difference to the belt scale lies in the very simple construction and the correspondingly low manufacturing costs, as is the case with the (however, fault-sensitive) pulse monitors.
  • the mill system according to the invention has, for the purpose of the invention, a combination of the advantages of the belt scales and the continuous flow meter without their disadvantages occurring.
  • the specification of new setting values for the drive means for setting the roller spacings also serves the purpose mentioned at the outset, namely that the entire mill run does not "start to oscillate".
  • the measurement signal is determined from the amount of rejection of the first shot (B 1 passage), preferably at short intervals, during the grinding process.
  • the measurement signal at passages B 2 and possibly also at further passages (B 3 ...) is preferably derived equally from the amount of screen rejection or the scrap.
  • a further measurement signal derived from the amount of sieve diarrhea or the amount of flour is also particularly preferred in the passages C 1 , again preferably at short time intervals, derived during the measurement process and fed to the computer.
  • the grinding passages it also applies, depending on the size and comfort requirements, that corresponding measurement value derivations can be carried out both for the C 2 passages and any specifically selected grinding passages.
  • the measurement signal is particularly preferably derived from the amount of rejection or diarrhea of the following combinations of passages:
  • the latter combination for deriving the measured value is based on the idea that passages Bi and Ci ensure a control process, but passages 8 4 and C 4, on the other hand, only serve as a control. Only particularly preferred combinations for the derivation of the measuring signal at particularly important measuring points are listed here, which, however, can be selected or used by the person skilled in the art depending on the specific mill system.
  • a default setpoint value scheme is stored in the computer for each grain mixture or for each grinding task, in which all the values for the automatic control of the grinding roller spacings, in particular the default setting values corresponding to the grinding gap, as well as those for the minimum and maximum values for the amount of meal or flour obtained, in which the target values of the roller mills are not changed, are specified. In this way, an undesired, too frequent correction of the roller settings can be avoided. Because, at least theoretically, a single grinding gap correction in the first shot roller mill in a larger mill system means that the conditions in all the following twenty to thirty roller mills and plan sifters are also changed.
  • a correction program is therefore preferably assigned to the computer, which automatically carries out correction commands by changing the working setpoints in the order from the largest to the smallest correction. So is z. B. a strong deviation is found in the selection passage C 1 , this is first corrected, then only z. B. a necessary follow-up correction for passage Bi etc.
  • the computer contains a basic program that also includes non-automatically recorded parameters (such as grinding pressure, force absorption, effective grinding gap width, etc.), in particular also those of the non-automatically controlled machines (ie non-automatically setting or adjustable roller mills and derived values with regard to sieving work) are recorded and can be called up at any time, so that, based on older values, controls and corresponding manual interventions can be carried out.
  • non-automatically recorded parameters such as grinding pressure, force absorption, effective grinding gap width, etc.
  • non-automatically controlled machines ie non-automatically setting or adjustable roller mills and derived values with regard to sieving work
  • This solution particularly expresses the benefits of the automatic means for all the necessary controls and manual entries.
  • this also has the advantage that the miller can reuse the previous values for each shift in a mill. This also makes it possible to ensure relatively constant operational management of the mill system, even with changing personnel.
  • the grinding gap is automatically preset for only a part of all rolling mills and then only for some of these automatically preset rolling mills the screen rejection and / or the screen diarrhea are measured and the measurement signal is derived from this.
  • the grinding gap is preferably automatically preset only in a part of all rolling mills and then only in some of the automatically presettable rolling mills is the screen rejection and / or screen diarrhea measured or the measurement signal derived therefrom, again: preferably, in less than half of all rolling mills
  • the grinding gap is automatically preset and the sieve diameter or sieve rejection is measured in two to six subsequent plan sifters and a measurement signal is derived from this.
  • the measurement signal is derived from instantaneous values of the force components of both the inflow impulse of the product flow and its weight in a weighing vessel, the sieve failure and / or the sieve rejection in continuous operation by recording these instantaneous values over a short period of time determined, a control variable is derived from this and used for the automatic monitoring and, if necessary, control of the roller mills. It is noteworthy that obviously all previous attempts based on the directly operating continuously operating pulse measuring systems have failed. With these continuous weighing systems, due to the impulse of a falling product flow, the amount of product concluded, which leads to relatively good results under ideal conditions. However, if disturbances occur, z. B.
  • the weight increase in the weighing vessel is therefore recorded without interruption of the product flow per unit of time in order to determine the control variable, the detected value is compared with the total mill output and then communicated to the computer as parameters for the viewing unit.
  • weighing is carried out in the weighing vessel according to a predetermined cycle, preferably approximately every 10 to 30 minutes, and it lasts less than 10 seconds, preferably less than 5 seconds.
  • the grinding rollers are preferably designed to be controllable or regulatable via the computer on the basis of an actual setpoint value comparison for setting or regulating corresponding working parameters that can be set via the grinding rollers (grinding roller speed and / or grinding gap), with, again, preferably, the setting devices or their drive means a central computer can be remotely controlled and a mechanical or electrical coupling is provided between the drive means and the adjusting coupling.
  • This solution is preferably used for grinding passages, ie for smooth rollers.
  • the setting device or its drive means can preferably be remotely controlled via the computer and provided with a pressure or distance or force absorption limiting device to prevent harmful inputs.
  • FIG. 1 shows a roller mill 1, of which only half or a pair of grinding rollers 2, 2 'is shown.
  • a special peculiarity of the milling roller mill lies in the fact that, unlike products such as stone or coal, the product is not crushed, but also not only squeezed into it. Rather, an actual pressure-shearing process is used, which is achieved by increasing the rotational speed of one roller, such as roller 2 ', in comparison to the rotational speed of the other roller, such as roller 2.
  • the grinding rollers 2, 2 ' may therefore only be engaged if product is present, which can be determined or controlled via a product guiding device 3.
  • the grinding gap itself can be preset to a desired dimension using a handwheel 6 or, if necessary, subsequently corrected by the operator. Regardless of this manual setting, however, the grinding gap can also be remotely controlled by a computer 7 with memories 8, 8 ', 8 "for setpoints.
  • the grinding gap can now, for example, as described in EP-B1-0 013 023 certain optimum value found by previous grinding are set automatically in the sense of a rough setting via an adjusting motor 9 and a chain 10 which engages a shaft 11 of the handwheel 6.
  • An analogous value for measuring the grinding gap is carried along with a chain 10 Position indicator 12 determined and reported back to the computer 7 via a control line 13.
  • a plan sifter 14 is shown schematically at the top right.
  • the product flow is represented as an input power in the roller mill 1 with an arrow 15, the arrow 16 shows the product transfer from the roller mill 1 into the plan sifter 14, the arrow 17 denotes the screen rejection and arrow 18 the screen diarrhea.
  • the plansifter 14 is provided with individual sieve frames 19, 20, 21 and 22, the number of which depends on the product performance and in particular based on the respective product quality.
  • FIG. 1 shows the detection of the product throughput as a function of the screen rejection (arrow 17) in a control circuit with solid lines.
  • a weighing vessel 23 is mounted separately from the fixed contact elements via elastic sleeves 27, 28; an inlet 25 and an outlet 26 are also provided.
  • the weighing vessel 23 is supported on electronic balance elements 24, which transmit the weight signals to a controller 29 as measurement signals.
  • a converter 30 emits a pneumatic signal to a cylinder 31, which actuates a slide slide 32.
  • the weighing system is described in more detail in EP-A1-140 213, to which reference is made in full.
  • the corresponding memory locations are called up by a central computer 40 (FIG. 2) via a control line 41 and the data are made available to the computer 7 in accordance with the desired grinding work to be carried out.
  • Essential data are the values for the grain mixture and moisture, for the grinding work and for the input power, but in particular the associated value for the roller mill, the grinding gap, the grinding pressure or the electrical current consumption of the drive motor of the roller mill and a current measuring device 34.
  • the grinding roller distance can be derived directly from the measured value of the position indicator 12 or, if the corresponding display 6 'of the handwheel 6 is displayed, the next important value is the acquisition of a corresponding measured value on the plan sifter, in the example of FIG the amount of weight per unit time with respect to the S iebabschlages the z. B. is selected as the preferred key passage in the first shot passage.
  • the measured value of the position indicator 12 is now referred to as the "roller distance" for the example shown.
  • the amount of product of the first sieve rejection or the instantaneous or averaged output of the second shot or the amount of shot B 2 obtained per unit of time is measured and compared accordingly.
  • the absolute value of the roller spacing is no longer of interest for the control to be carried out, since a corresponding numerical value can be determined from previous optimizations, whereas the exact value of the amount of shot B 2 is very important.
  • control means are indispensable for large plants (only and especially for these) so that a person is actually able to actually run a mill plant as a whole and to keep the necessary overview, which is the main object of the present invention.
  • the values from one or more key passages or the selected sieve diarrhea or sieve rejection as well as one or more important other measured values from the production process are continuously selected and monitored.
  • Is now z. B. the proportion of the rejection of the first shot at 70 to 75% of the mill input, this is an indication for the miller that the processing runs well to the corresponding point.
  • the control can now be set up so that a narrow tolerance band is selected for the sieving value for each individual grinding task and for each individual grinding passage, in within which the grinding process is sufficiently satisfactory, which, for. B. can be displayed via a corresponding indicator lamp.
  • a second, larger tolerance band is provided, within which a change in the grinding gap is triggered directly by the computer and is maintained after a corresponding time delay if the correction has been successful.
  • a sieve value is measured that is still outside the broader tolerance band, z. B. triggered alarm or, if necessary, the roller mill can be turned off completely.
  • FIG. 2 is used as the basic diagram for this, only individual specimens being shown in principle as processing machines, even if a large number of such machines are used in practical milling work instead of the individual specimen shown.
  • the central computer 40 has a memory 42 for the target value schemes and can simultaneously be connected to other computer units 43, for example to an accounting computer.
  • the computer can be equipped with a central screen 44 and a central input printer 45.
  • one or more portable screens with input printers are preferably provided, which are suitable for local interventions, e.g. B. in a roller mill, etc., can be used at the workplace.
  • B. in a roller mill, etc. can be used at the workplace.
  • only the same reference numerals as in FIG. 1 have been chosen for the first grinding passage B i , although the corresponding identical elements are located at any other point in the mill, that is to say at B 2 , B 3 or Bx and Ci , C 2 , C 3 ... Cx can be used.
  • passages Bi and B 3 and C i and Cs Only part of the passages are fully monitored, in FIG. 2 these are passages Bi and B 3 and C i and Cs. Furthermore, another part of the roller mills has an automatic grinding gap control device with a computer, but without a weighing system, in FIG. 2 this is passage B x , and furthermore, in the case of a large number of the passages, there is neither automatic control of the roller mills nor weighing of the screen rejection or screen diarrhea , in Figure 2 with Div 1 and C x . As a rule, no mechanical monitoring is carried out for the majority of the passages in the sense of the invention, however, it is conceivable that the current consumption is measured and monitored for all drive motors of the roller mills.
  • FIGS. 3 and 4 merely represent enlarged representations from FIG. 2, the diagramatic connections being evident.
  • the passages labeled B are the beginning of the grinding, S denotes the semolina cleaning machines and C represents the grinding passages.
  • "Div 1" denotes a diviseur.
  • the mill input ie the amount of raw fruit to be processed
  • the mill input is recorded precisely during the entire grinding, for example by means of a weighing system which is denoted by 50 at B i . Since the grinding passages are fed from different locations, a measurement of the input power is required for the C passages at least for C 1 A by means 51 (only shown in principle) and for B 2 , C 2 by means 52 shown in principle.

Abstract

Dans un procédé de réglage de l'écartement des cylindres broyeurs (2, 2') dans des moulins à cylindres (1) d'une installation de mouture de céréales, un signal de mesure est dérivé d'un système de tamis (14) monté en aval de chaque moulin à cylindres et transmis à un ordinateur (7). L'ordinateur compare ce signal avec une valeur enregistrée de consigne et ajuste automatiquement l'écartement des cylindres broyeurs en émettant un signal de commande de dispositifs d'ajustement (4, 5), au cas où il existe une différence entre la valeur de consigne et le signal de mesure. Le signal de mesure est dérivé uniquement du rejet (17) par le système de tamis (14) ou du produit passé (18) par le tamis, et uniquement de certains passages-clés sélectionnés, avant d'être transmis à l'ordinateur (7). Dans une installation de moulage de céréales où ce procédé est appliqué, un système de pesage par impulsions (24, 29, 30, 31) est subordonné au(x) plansichter(s) (14) afin de contrôler continuellement le tamisage.

Claims (15)

1. Procédé d'ajustement des écartements existant entre les cylindres broyeurs de moulins à cylindres (1) comportant chacun un dispositif de blutage (14) monté en aval, ces moulins à cylindres faisant partie d'une installation de mouture de céréales, procédé selon lequel on relève, dans des passages-clés sélectionnés et dans chacun d'eux, un signal de mesure représentant une valeur réelle, on l'envoie à un ordinateur (40), on l'y compare à une valeur de consigne se trouvant en mémoire et, en cas d'écart entre cette valeur réelle et cette valeur de consigne, on produit un signal de commande (41 caractérisé en ce qu'on choisit, comme valeur réelle et valeur de consigne, le rejet (17) ou le passé (18) du dispositif de blutage (14) et on utilise le signal de commande (41) pour fixer de nouvelles valeurs d'ajustement pour les écartements entre cylindres.
2. Procédé suivant la revendication 1, caractérisé en ce que, dans le cas des passages Bi, ou Bi et B2, au Bi, B2 et B3, on déduit le signal de mesure de la quantité du rejet du blutage ou de celle du gruau.
3. Procédé suivant la revendication 1 ou 2, caractérisé en ce que, dans le cas des passages C1, ou Ci et C2, ou C1, C2 et C3, on déduit le signal de mesure de la quantité du passé du blutage ou de celle de la farine produite.
4. Procédé suivant l'une des revendications 1 à 3, caractérisé en ce que, pour chaque mélange de céréales ou pour chaque type de mouture prescrit, on met en mémoire dans l'ordinateur un modèle de valeurs de consigne fixées, dans lequel sont indiquées toutes les valeurs correspondant à la commande automatique des écartements entre cylindres broyeurs, notamment les valeurs fixées d'ajustement correspondant à l'intervalle de broyage, ainsi que, pour le gruau ou la farine produits, des valeurs minimales et maximales, valables pour le plansichter intervenant suivant, à l'intérieur desquelles aucune valeur de consigne des moulins à cylindres n'est modifiée.
5. Procédé suivant la revendication 4, caractérisée en ce qu'on associe à l'ordinateur un programme de correction qui exécute automatiquement des ordres de correction, en modifiant les valeurs de consigne de travail, dans l'ordre allant de la plus grande correction à la plus faible.
6. Procédé suivant l'une des revendications 1 à 5, caractérisé en ce que l'ordinateur contient un programme de base qui porte aussi sur des paramètres qui ne sont pas relevés automatiquement (tels que la pression de broyage, la puissance consommée, la largeur effective de l'intervalle de broyage, etc.), notamment aussi sur ceux des machines qui ne sont pas commandées automatiquement (moulins à cylindres qui ne sont pas ajustables et réglables automatiquement et valeurs déduites concernant le travail de blutage), ce programme pouvant être interrogé à tout instant, de sorte que des contrôles et des interventions manuelles appropriées peuvent être effectués en s'appuyant sur des valeurs plus anciennes.
7. Procédé suivant l'une des revendications 1 à 6, caractérisé en ce qu'on procède automatiquement à un préajustement de l'intervalle de broyage seulement sur une partie de tous les broyeurs à cylindres et en ce qu'on mesure ensuite le rejet du blutage et/ou le passé du blutage seulement sur une partie des broyeurs à cylindres pouvant être préajustés automatiquement.
8. Procédé suivant la revendication 7, caractérisé en ce qu'on préajuste automatiquement l'intervalle de broyage sur moins que la moitié de tous les broyeurs à cylindres et on mesure le passé du blutage ou le rejet du blutage sur deux à six plansichters suivants.
9. Procédé suivant l'une des revendications 1 à 8, caractérisé en ce qu'on déduit le signal de mesure à partir de valeurs instantanées des puissances partielles utilisées, ainsi que de la quantité de mouvement d'entrée du courant de produit, ou de son poids dans une enceinte à pesée, on détermine le passé du blutage et/ou le rejet du blutage en fonctionnement continu en relevant ces valeurs instantanées sur un court intervalle de temps, on en déduit une grandeur de commande et on l'utilise pour la surveillance automatique et éventuellement la commande des moulins à cylindres.
10. Procédé suivant la revendication 9, caractérisé en ce que, pour déterminer la grandeur de commande, on relève l'augmentation de poids par unité de temps dans l'enceinte à pesée, sans interruption du courant de produit, on compare la valeur relevée à la capacité globale des moulins et on l'introduit alors dans l'ordinateur en tant que paramètre correspondant à l'unité de blutage.
11. Procédé suivant la revendication 9 ou 10, caractérisé en ce que, dans l'enceinte à pesée et suivant un cycle fixé à l'avance, on exécute une pesée qui dure moins de 10 s, de préférence moins de 5 s.
12. Installation de mouture de céréales, comportant:
a) une série de moulins à cylindres (1) et de plansichters (14) disposés en aval de ceux-ci,
b) des moyens d'entraînement (4, 5, 9) pouvant être commandés et servant à ajuster les écartements entre cylindres,
c) des dispositifs de mesure (23, 24) servant à mesurer la valeur réelle de paramètres de fonctionnement et
d) un ordinateur central (40) comportant une mémoire de données (42) et servant à surveiller les valeurs réelles de passages-clés sélectionnés, à les comparer à des valeurs correspondantes de consigne déposées dans la mémoire de données (42) et à produire des signaux de commande (41) en cas d'écarts entre des valeurs réelles et des valeurs de consigne, caractérisée en ce que:
e) le dispositif de mesure (23, 24) est un dispositif de mesure de poids en continu disposé en aval des plansichters (14) et servant à relever en continu le rejet de blutage (17) ou le passé de blutage (18) et
la sortie de commande (41) de l'ordinateur (40), qui comporte une mémoire de valeurs de consigne (8), est reliée aux moyens d'entraînement (4, 5, 9) en vue de fixer de nouvelles valeurs d'ajustement.
13. Installation de mouture de céréales suivant la revendication 12, caractérisé en ce que les cylindres broyeurs peuvent être commandés ou être réglés à l'aide de l'ordinateur, sur la base d'une comparaison de valeurs réelles et de valeurs de consigne, en vue d'ajuster ou de régler des paramètres appropriés de travail (vitesse de rotation des cylindres broyeurs et/ou intervalle de broyage) qui peuvent être ajustés à l'aide des cylindres broyeurs.
14. Installation de mouture de céréales suivant la revendication 12 ou 13, caractérisée en ce que les dispositifs d'ajustement ou leurs moyens d'entraînement peuvent être télécommandés à l'aide d'un ordinateur central et en ce qu'il est prévu un accouplement mécanique ou électrique entre les moyens d'entraînement et le dispositif d'ajustement.
15. Installation de mouture de céréales suivant la revendication 12 ou 13, caractérisée en ce que le dispositif d'ajustement ou ses moyens d'entraînement peuvent être télécommandés à l'aide de l'ordinateur et, afin d'empêcher des introductions perturbatrices, sont pourvus d'un dispositif de limitation de pression, de distance ou de puissance consommée.
EP86901845A 1985-03-15 1986-03-05 Procede d'ajustement des cylindres broyeurs des moulins a cylindres d'une installation de mouture de cereales, installations de mouture de cereales utilisant ce procede Expired - Lifetime EP0215865B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86901845T ATE50163T1 (de) 1985-03-15 1986-03-05 Verfahren zum einstellen der mahlwalzen bei walzenstuehlen einer getreidemuehlenanlage sowie getreidemuehlenanlage zur durchfuehrung des verfahrens.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH116485 1985-03-15
CH1164/85 1985-03-15
DE3519625 1985-05-31
DE19853519625 DE3519625A1 (de) 1985-03-15 1985-05-31 Verfahren zum einstellen der mahlwalzen bei walzenstuehlen einer getreidemuehlenanlage sowie getreidemuehlenanlage zur durchfuehrung des verfahrens

Publications (2)

Publication Number Publication Date
EP0215865A1 EP0215865A1 (fr) 1987-04-01
EP0215865B1 true EP0215865B1 (fr) 1990-02-07

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EP86901845A Expired - Lifetime EP0215865B1 (fr) 1985-03-15 1986-03-05 Procede d'ajustement des cylindres broyeurs des moulins a cylindres d'une installation de mouture de cereales, installations de mouture de cereales utilisant ce procede

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US (1) US4881689A (fr)
EP (1) EP0215865B1 (fr)
WO (1) WO1986005416A1 (fr)

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CN107552149B (zh) * 2017-10-13 2019-04-23 中国矿业大学 一种辊式破碎机辊缝间隙自动调节装置及工作方法

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WO1986005416A1 (fr) 1986-09-25
EP0215865A1 (fr) 1987-04-01

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