EP0492080B1 - Procédé et appareillage pour contrôler le fonctionnement d'un broyeur à rouleaux - Google Patents

Procédé et appareillage pour contrôler le fonctionnement d'un broyeur à rouleaux Download PDF

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Publication number
EP0492080B1
EP0492080B1 EP91118151A EP91118151A EP0492080B1 EP 0492080 B1 EP0492080 B1 EP 0492080B1 EP 91118151 A EP91118151 A EP 91118151A EP 91118151 A EP91118151 A EP 91118151A EP 0492080 B1 EP0492080 B1 EP 0492080B1
Authority
EP
European Patent Office
Prior art keywords
control
reaches
variable
intervention
intervention point
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91118151A
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German (de)
English (en)
Other versions
EP0492080A1 (fr
Inventor
Eberhard Wilhelm Dipl.-Ing. Neumann
Friedrich Vom Hofe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Krupp Polysius AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Krupp Polysius AG filed Critical Krupp Polysius AG
Publication of EP0492080A1 publication Critical patent/EP0492080A1/fr
Application granted granted Critical
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/32—Adjusting, applying pressure to, or controlling the distance between, milling members
    • 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
    • B02C4/286—Feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/005—Control arrangements
    • B30B11/006—Control arrangements for roller presses

Definitions

  • the invention relates to a method and a device for regulating the operation of a material bed roller mill, in particular for regulating the fill level of the feed hopper and the power consumption of the roller drive motors.
  • DE-A-34 07 535 is concerned with a device for the automatic regulation of the throughput of a two-stage shredding, in which the first shredding stage by a kind of material bed roller mill and the second crushing stage is formed by a grinding plant with a tube mill and sifter.
  • the material bed roller mill is preceded by a dosing belt scale with a controller, which in turn is connected to a controller of the grinding system (second comminution stage), from which the grinding flow setpoint for the controller of the dosing belt scale is obtained.
  • the throughput of the first comminution stage is to be adapted automatically (through appropriate control interventions) to the throughput performance of the downstream second comminution stage (grinding system) which changes as a result of operational fluctuations or product changes.
  • a feed hopper with a minimum and a maximum fill level indicator can additionally be arranged between the dosing belt scale and the first size reduction stage, which is in operative connection with the controller of the dosing belt weight scale, but which in turn has the mass flow setpoint obtained from the controller of the second size reduction stage switched on becomes.
  • FR-A-25 12 927 is concerned with controlling the coal outflow from a bunker in a coal production line to a coal mill, which is obviously not a material bed roller mill, as in the case of the present invention.
  • the main aim of this known device is to monitor the flow of coal through a line section and to indicate an imminent dangerous empty state.
  • a radiation detector generates a pulse train via the amount of coal present immediately below the bunker in the line section, in order to use it to flow through the line section Determine the amount of coal per unit of time.
  • a kind of target and actual value comparison or empty display by appropriate signals for increased coal supply from the bunker or - if there is a risk of empty signal - a closing of the coal line can be initiated.
  • EP-A-0 163 890 is a feeding and testing system for the chocolate in chocolate roller grinders, the structure and mode of operation of which are not comparable to a material bed roller mill, the operation of which is to be regulated according to the present invention.
  • a chocolate hopper which cooperates with a load cell with an electrical load cell, above a chocolate receiving chamber, which is located above the lower pair of rollers of a plurality of cooperating roller pairs arranged one behind the other or one above the other Determine chocolate level in the funnel and display the actual performance and fineness of the finished chocolate film, for example via a data processing and display device.
  • GB-A-21 59 306 also has no relation to a material bed roller mill.
  • This publication is concerned with the setting of a comminution gap in a crusher or the like, which can be one with a swash plate or with a crusher cone.
  • An essential idea of this known method is seen in the fact that the comminution gap is monitored and set as a function of the amplitude of the changes in the power consumption of the crusher motor, the respective current comminution gap being compared with a predetermined value and then adjusted in accordance with the deviation from this predetermined value becomes. In a way, a setpoint / actual value comparison is used here.
  • the invention is therefore based on the object of providing a method and a device for regulating the operation of a material bed roller mill which are characterized by a high stability of the control even when the grindability of the goods changes.
  • the control method according to the invention thus works without a fixed setpoint for the controlled variable, which can level off freely according to the properties of the regrind to the respectively optimal value. In this way, extremely stable control is achieved even when the grindability changes during operation.
  • the control concept according to the invention can be implemented with any freely programmable control.
  • Example 1 Control of the filling level of the feed hopper
  • a number of intervention points are defined within the fill level range from 0 to 100%, for example at intervals of 0.5%. Every time the control variable representing the actual level reaches one of these points of intervention, the manipulated variable (i.e. the mass flow of at least one feed component of the material bed roller mill) is changed by a fixed, also adjustable value, and this mass flow is reduced with increasing fill level and with falling Level increased.
  • the manipulated variable i.e. the mass flow of at least one feed component of the material bed roller mill
  • a good bed roller mill of the type POLYCOM was regulated with a freely programmable control S5 (Siemens AG) for a throughput of 600 t / h and a fresh material quantity of 190 t / h in the fill level.
  • S5 freely programmable control
  • the quantity of fresh product fluctuated by +/- 50%, whereas when regulating according to the method according to the invention only about +/- 5%.
  • the fresh material throughput averaged over a longer period of time increased from 170 t / h to 190 t / h in the process according to the invention.
  • the fill level automatically settled to a new value, at which the control again remained very stable and which can therefore be described as the optimum fill level (for the changed grindability of the material). If, on the other hand, external control interventions were attempted to keep the fill level at the original value when the grindability changed, there would be significantly greater fluctuations in the manipulated variable.
  • the mass flow is expediently changed by a fixed, adjustable value.
  • the change values of the manipulated variable were set to 4% with increasing fill level in the example above for fill levels above 80%.
  • the outlet pressure was selected so that a power consumption of 1800 kW was achieved for goods that were difficult to grind. If the grindability became better, more ground material was fed into the mill, the grinding gap increasing and the hydraulic pressure and the power consumption increasing. If the power consumption reached the highest point of engagement of 1850 kW, the hydraulic pressure was reduced until the power consumption had dropped to 1800 kW. This process may have been carried out several times in succession, because the better grindability of the material means that the power consumption has repeatedly increased to the highest point of intervention of 1850 kW despite the pressure being reduced.
  • the hydraulic pressure was increased until the second lowest intervention point of 1730 kW was reached. This could also happen more than once. If the controlled variable reached the lowest intervention point several times in succession, the control interventions triggered thereby and increasing the manipulated variable were also counted. Their number was limited according to the number of previous control interventions reducing the manipulated variable (the number of pressure increases was therefore limited to the number of previous pressure reductions, which is a safety measure against an excessive pressure increase).

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)

Claims (9)

  1. Procédé de réglage de la marche d'un broyeur à cylindres et à lit de matière, caractérisé en ce qu'au moins trois points d'intervention sont fixés dans la plage de réglage d'une grandeur réglée et lorsqu'ils sont atteints
    - la grandeur réglante subit une diminution d'une valeur fixe réglable en cas de tendance de la valeur réglée à croître,
    - et la grandeur réglante subit une élévation d'une valeur fixe réglable en cas de tendance de la grandeur réglée à chuter.
  2. Procédé selon la revendication 1, caractérisé en ce qu'au moins quatre points d'intervention sont fixés dans la plage de réglage d'une grandeur réglée,
    - la grandeur réglante subit une diminution jusqu'à ce que la grandeur réglée atteigne l'avant-dernier point supérieur d'intervention lorsque la grandeur réglée ayant une tendance à croître atteint le point le plus élevé d'intervention,
    - la grandeur réglante subit une élévation jusqu'à ce que la grandeur réglée atteigne l'avant dernier point inférieur d'intervention lorsque la grandeur réglée ayant une tendance à chuter atteint le point le plus bas d'intervention.
  3. Procédé selon la revendication 1, caractérisé en ce que la grandeur réglée est formée du niveau de remplissage de la trémie de déversement et la grandeur réglante est formée du flux massique d'au moins une composante déversée dans le broyeur à cylindres et à lit de matière.
  4. Procédé selon la revendication 3, caractérisé en ce que les modifications du flux massique affectées à un point d'intervention ne sont effectuées qu'à la fin d'un temps prescrit et réglable de délai à condition que le niveau de remplissage n'atteigne pas à nouveau ce point d'intervention pendant le temps de délai à la suite d'une tendance inverse et le temps de délai qui s'est déjà écoulé est toujours remis à zéro lorsque le niveau de remplissage a de nouveau atteint le même point d'intervention pendant le temps de délai.
  5. Procédé selon la revendication 3, caractérisé en ce que le flux massique subit une modification d'une valeur fixe réglable lorsque le niveau de remplissage atteint un point d'intervention.
  6. Procédé selon la revendication 2, caractérisé en ce que la grandeur réglée est formée de la consommation d'énergie des moteurs de commande des cylindres et la grandeur réglante est formée de la pression hydraulique générée par la pression régnant dans l'interstice séparant les cylindres.
  7. Procédé selon la revendication 6, caractérisé en ce que
    - lorsque la grandeur réglée atteint plusieurs fois successivement le point le plus élevé d'intervention, les interventions de réglage qui en sont déclenchées et qui modifient la grandeur réglante sont comptées,
    - et ensuite, lorsque la grandeur réglée atteint plusieurs fois successivement le point le plus bas d'intervention, les interventions de réglage qui en sont déclenchées et qui augmentent la grandeur réglante sont également comptées et leur nombre est limité de manière correspondante au nombre des interventions précédentes de réglage qui diminuaient la grandeur réglante.
  8. Dispositif de réglage du niveau de remplissage de la trémie de déversement d'un broyeur à cylindres et à lit de matière par modification du flux massique d'au moins une composante déversée dans le broyeur à cylindres et à lit de matière,
       caractérisé par une commande librement programmable suivant laquelle au moins trois points d'intervention sont fixés dans la plage de réglage du niveau de remplissage de manière que, lorsqu'ils sont atteints,
       le flux massique subit une diminution d'une valeur fixe réglable en cas de tendance du niveau de remplissage à croître
       - et le flux massique subit une élévation d'une valeur fixe réglable en cas de tendance du niveau de remplissage à chuter.
  9. Dispositif de réglage de la consommation d'énergie des moteurs de commande des cylindres d'un broyeur à cylindres et à lit de matière par modification de la pression hydraulique générant la pression dans l'interstice séparant les cylindres,
       caractérisé par une commande librement programmable suivant laquelle au moins quatre points d'intervention sont fixés dans la plage de réglage de la consommation d'énergie de manière que
    - la pression hydraulique subisse une diminution jusqu'à ce que la consommation d'énergie atteigne l'avant dernier point supérieur d'intervention lorsque la consommation d'énergie ayant une tendance à croître atteint le point le plus élevé d'intervention
    - et, lorsque la consommation d'énergie ayant une tendance à chuter atteint le point le plus bas d'intervention, la pression hydraulique subit une élévation jusqu'à ce que la consommation d'énergie atteigne l'avant dernier point inférieur d'intervention.
EP91118151A 1990-12-21 1991-10-24 Procédé et appareillage pour contrôler le fonctionnement d'un broyeur à rouleaux Expired - Lifetime EP0492080B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4041316 1990-12-21
DE4041316A DE4041316A1 (de) 1990-12-21 1990-12-21 Verfahren und einrichtung zur regelung des betriebs einer gutbettwalzenmuehle

Publications (2)

Publication Number Publication Date
EP0492080A1 EP0492080A1 (fr) 1992-07-01
EP0492080B1 true EP0492080B1 (fr) 1995-08-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP91118151A Expired - Lifetime EP0492080B1 (fr) 1990-12-21 1991-10-24 Procédé et appareillage pour contrôler le fonctionnement d'un broyeur à rouleaux

Country Status (3)

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EP (1) EP0492080B1 (fr)
DE (2) DE4041316A1 (fr)
ES (1) ES2075296T3 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5433391A (en) * 1991-10-11 1995-07-18 Satake Uk Limited Cereal milling machine
BR112013028738A2 (pt) 2011-05-12 2017-01-24 Bühler AG dispositivo e método para fragmentação de partículas em um material líquido
DE102015012474B4 (de) 2015-09-29 2018-02-01 Hosokawa Alpine Aktiengesellschaft Presskraftregelung von Walzenpressen zur Kompaktierung von Kleinstmengen und Walzenpresse dafür
CN115178339B (zh) * 2022-04-11 2023-04-25 北京智冶互联科技有限公司 一种辊压操作自动控制方法、装置、电子设备及介质

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Publication number Priority date Publication date Assignee Title
DE1244535B (de) * 1963-12-14 1967-07-13 Miag Muehlenbau Verfahren und Schalteinrichtung zum Regeln einer Muehle
US3468488A (en) * 1965-11-30 1969-09-23 Buehler Ag Geb Automatic control of feed material in a comminuting mill
US4314241A (en) * 1980-01-28 1982-02-02 Merrick Scale Mfg. Company Coal pipe monitor
DE3407535A1 (de) * 1984-03-01 1985-09-05 Klöckner-Humboldt-Deutz AG, 5000 Köln Einrichtung zur selbsttaetigen regelung der durchsatzleistung bei der zweistufigen zerkleinerung sproeder materialien
IT1173598B (it) * 1984-05-10 1987-06-24 Carle & Montanari Spa Impianto di alimentazione e controllo del cioccolato per raffinatrici di cioccolato
GB2159306B (en) * 1984-05-22 1987-08-05 De Beers Ind Diamond Crusher gap setting
DE3535406A1 (de) * 1985-10-03 1987-04-09 Krupp Polysius Ag Verfahren und anlage zur zerkleinerung von mahlgut
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Also Published As

Publication number Publication date
EP0492080A1 (fr) 1992-07-01
ES2075296T3 (es) 1995-10-01
DE59106222D1 (de) 1995-09-14
DE4041316A1 (de) 1992-06-25

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