EP0038054B2 - Apparatus for the automatic regulation of a roller mill comprising a product-feed control - Google Patents

Apparatus for the automatic regulation of a roller mill comprising a product-feed control Download PDF

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Publication number
EP0038054B2
EP0038054B2 EP81102782A EP81102782A EP0038054B2 EP 0038054 B2 EP0038054 B2 EP 0038054B2 EP 81102782 A EP81102782 A EP 81102782A EP 81102782 A EP81102782 A EP 81102782A EP 0038054 B2 EP0038054 B2 EP 0038054B2
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EP
European Patent Office
Prior art keywords
control
pneumatic valve
valve
pneumatic
contact
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EP81102782A
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German (de)
French (fr)
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EP0038054B1 (en
EP0038054A1 (en
Inventor
Werner Winteler
Hans Oetiker
Robert Linzberger
Leedert Ketting
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Buehler AG
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Buehler AG
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Priority to AT81102782T priority Critical patent/ATE16570T1/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
    • B02C4/38—Adjusting, applying pressure to, or controlling the distance between, milling members in grain mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/286—Feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C25/00—Control arrangements specially adapted for crushing or disintegrating
    • 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

  • a mechanical signal transmitter depending on the product supply deflects a transmitter element which actuates a switch contact which can be pressed into a pneumatic valve and which is pressed in by the transmitter element when the product supply increases, the input of the valve being connected to a compressed air line and for adjustment of the metering slide a servo device is provided.
  • DE-C 582423 describes a combination of electrical and mechanical control means which are also suitable for use with larger control forces, but the structural outlay is very considerable, in particular due to the use of a mechanical and an electrical system.
  • the mechanical output signal is used directly to control a downstream servo motor, with the mechanical transmitter element acting directly on the on / off control valve on the housing of the servo motor.
  • the servo motor directly actuates the metering slide via its output and an intermediate gear reduction. Fluctuations in the supply of the product result in corresponding fluctuations in the metering control.
  • CH-A 275417 describes a control arrangement of the type mentioned at the outset, in which, depending on the product supply, the mechanical encoder member is deflected and actuates a control pin of a pneumatic cylinder.
  • the housing of the pneumatic cylinder is rigidly attached to the roller frame, and the displacement movement of the piston of the pneumatic cylinder triggered by the control pin depending on the deflection of the encoder member is in turn used directly via intermediate levers to adjust the metering slide.
  • the object on which the invention is based is to further develop a device of the type mentioned at the outset in such a way that, with a relatively simple structure and little effort, it enables a particularly constant product feed and a particularly good maintenance of the product level even in the event of large fluctuations in performance.
  • this object is achieved in a device of the type mentioned in the introduction in that the output of the pneumatic valve is connected to the input of the servo device via a control line, the pneumatic valve in an off position, in which the switch contact is in the extended position, and in a switch-on position, in which the switch contact is fully depressed, and switchable into a zero position between the two switch positions, in which the switch contact is in a middle press-in position and both lines are blocked, the switch contact when pressed in the direction of its extended position is preloaded, and that during an adjustment movement of the servo device, the housing of the pneumatic valve is always moved relative to the transmitter element in the direction of setting its zero position.
  • the invention makes it possible, with a mechanical signal transmitter, to regulate the product feed for a roller mill sensitively via a servo device by means of a follow-up control using a valve with an intermediate zero switching position.
  • a three-position valve which is required according to the invention and which follows every movement of the transmitter element with a delay, leads, as practice shows, to a regulation in which a really constant product supply line and an excellent constant level of the product level in the dining area, even in the case of strong short-term ones Shock loads in the product feed can be achieved.
  • An advantageous embodiment of the device according to the invention also consists in that a second valve, acted upon by the control pressure in the control line of the pneumatic valve, is provided for controlling the engagement and disengagement of grinding rollers.
  • a particularly simple construction of an effective and reliable design of the device according to the invention is achieved in that a lever arm is attached with its one end pivotable to the roller frame, on which both the housing of the pneumatic valve and an adjusting member for the metering slide as well as the piston rod also are provided servo devices arranged on the roller mill frame, the housing of the pneumatic valve being seated at the free end of the lever arm, the servo device further comprising a pneumatic cylinder with piston and piston rod, and the control side of the piston being acted upon by the control pressure of the pneumatic valve via the control line, while the other side of the piston is under the influence of a preload.
  • the servo device forms together with the lever articulated on one side on the roller mill poor a functional unit in which effective and reliable control of the feed power is possible with just a few moving parts.
  • the structural effort required is surprisingly low. It is advantageous if links for adjusting the speed of the feed rollers are also attached to the lever arm, wherein regulation of the feed power is possible alternatively or simultaneously by means of a metering slide on the one hand and feed roller speed on the other.
  • a particularly advantageous embodiment of the device according to the invention also consists in the pneumatic valve being designed as a diaphragm valve which is switched by a tappet or a roller lever which has a vent opening.
  • the piston side facing away from the control side of the piston for adjusting the metering slide is preferably biased by a compression spring in the direction of a closed position of the metering slide.
  • a product feed control is shown schematically in FIG. 1: in the left half of the figure, the feed area 70 is shown, which is closed at the bottom by a distribution roller 71, a feed roller 72 and a metering slide 73.
  • a probe 74 is arranged in the dining area 70 and is supported on a pivot pin 76 by a support 75.
  • the carrier 75 has a transmitter 77 which is operatively connected on the one hand to a tension spring 78 and on the other hand to a roller lever 79 of a pneumatic valve 80.
  • the pneumatic valve 80 is connected on the input side to a compressed air line 81; a control line 82 leads from the pneumatic valve 80 to a servo cylinder 83 to act on a piston 84 located therein on one side thereof.
  • a piston rod 85 is provided, which is fastened at the end with a hinge pin 86 to a lever arm 87, which in turn is articulated on the fixed frame structure 89 about a swivel joint 88.
  • the pneumatic valve is fastened to the other end of the lever arm 87 and follows the lever laws, the movement of the piston rod 85 and the lever arm 87.
  • a metering slide 73 is also non-positively fastened to the latter via a connecting bracket 91 or planks 92 and 93.
  • the metering slide 73 can be tilted about a pivot bearing 94, a metering gap being established between it and the feed roller 72, depending on its current position.
  • the entire system is fed by a pressure supply 95.
  • the compressed air for the control side can also be interrupted via a hand switch 98, for example to carry out service work.
  • the system pressure is kept constantly at a constant pressure by the supply mentioned, which pressure (e.g. at a value of 6 bar) is delivered via a line 99 as a counterpressure to the side of the piston 84 which is away from the control pressure.
  • a spring 100 or both can also be used together.
  • the use of a spring 100 has the advantage that the metering slide closes securely if the compressed air fails.
  • FIG. 2 shows the pressure curve of the control signal, as can be determined in the control line 82 using a pressure recorder.
  • the values correspond to the measurement on a roller mill of a B passage.
  • the pressure is remarkably stable and only briefly (at about 29 seconds) is interrupted by a short pressure increase.
  • the essentially horizontal course of the curve shows that very short-term power variations are passed on in the control signal.
  • the entire control loop is artificially interrupted by manually disengaging the grinding rollers, which means that the control signal immediately drops to zero.
  • the rapid response of the control to a corresponding malfunction is very advantageous. However, it is particularly important to start the control after the grinding rollers are engaged.
  • the control signal runs out for about 1 sec.
  • the restart of the signal occurs almost without delay and, which is particularly interesting from a control point of view, the signal immediately goes to an approximately medium value, then swings for about 10 seconds this value and then immediately leads back to a stable control behavior.
  • the quick reaction to the change which takes place with almost no oversteer and no rocking.
  • FIG. 2 shows constantly recurring constant control periods of 5 to 10 seconds, all of which lie within a relatively narrow control range. For the grinding rollers and this is very important for the roller bearing, since it can be prevented by the feed control device from vibrating due to constantly changing grinding forces.
  • the control signal is shown for a C passage (i.e. a rear passage) in which the amount of product fed to the roll mill hardly varies over shorter and longer periods.
  • This case is particularly easy to control in terms of control technology.
  • the product supply was briefly disrupted, which immediately triggered a corresponding drop in the control signal.
  • the curve curve that follows is almost a kind of “ideal curve”.
  • the grinding rollers were briefly removed by hand after about 115 seconds and then immediately reinserted without delay.
  • the diagram shown shows, surprisingly, that after a very slight override, the same control value as before the artificial disturbance is restored after about 1 to 2 seconds and the original curve continues.
  • FIG. 4 shows an embodiment in which the feed regulation shown essentially in FIG. 1 is combined with a roller engagement and disengagement.
  • FIG. 4 shows an embodiment for a typical mill roller mill with a double design for the actual grinding unit.
  • the piston 120 is coupled to the movable roller or the corresponding roller bearing via a piston rod 121.
  • the grinding gap of the grinding rollers is selected according to the material to be ground using a handwheel. If no regrind is being fed in via the dining area 70, the probe 74 is pressed upwards by a tension spring 78. The transmitter 77 does not touch the switch contact 79 of the pneumatic valve 80, so that no pressure is built up in the control line 82. The spring 100 or the pressure from the line 99 (or both, depending on the choice of system) push the lever arm 87 counterclockwise and thus the metering slide 73 into a closed position. The metering gap is closed so that no product is metered onto the grinding rollers. If there is no control signal in the control line 82 or 115, there is also no control pressure at the booster valve 116, which is why the grinding rollers are in the disengaged position via the cylinders 118.
  • the impulse of the flowing material or a corresponding weight component acts immediately on the probe 74, which is thereby pressed downwards.
  • the encoder 77 moves to the right, presses in the switch contact 79, and thereby triggers a control signal.
  • the probe 74 is in motion with the transmitter 77, i. H. the switch contact 79 is fully pressed onto the pneumatic valve 80 in one go.
  • the transmitter 77 releases the maximum control pressure in the control line 82 even with the smallest movements, particularly when using a very sensitive diaphragm valve for the pneumatic valve 80.
  • the piston rod 85 with the lever 87 and the pneumatic valve 80 are set in motion in a period of hundredths or tenths of a second, with the directly connected metering slide starting to open and product being fed onto the grinding rollers.
  • Both the cylinder 118 and the cylinder 83 are designed as pneumatic servo cylinders, as a result of which the workforce is generated quickly but not suddenly.
  • the air in the cylinder forms a kind of “shock absorber”. It has been shown that a suitable choice of the tension and compression springs of the cross-sections in the pneumatic lines and corresponding preloads of the springs can achieve a perfect synchronization of the control functions with regard to the machine elements concerned. This applies to both the entry and exit cases.
  • the lever arm 87 executes a small swiveling movement clockwise when the product feed is inserted as the first phase. Simultaneously with this, the switching contact 79 also runs away from the transmitter 77. The tension spring 78 tensions in proportion to the distance of the encoder 77. If only a small amount of product is fed in via the glass cylinder, then a balance is established very quickly between the regrind forces on the probe 74, in which the feed segment 73, the lever arm 87 and the pneumatic one Valve 80 remain in position.
  • the transmitter 77 and the switching contact 79 which can be inserted into the pneumatic valve 80 via a spring, are in constant mutual interaction, whereby the smallest movements occur, which, however, which is a significant advantage, no longer have a direct influence on the changed. exert pneumatic control signal.
  • the pneumatic valve 80 remains in this phase in a zero position, with all on and off aisles are closed.
  • the pressure value of the pneumatic control signal generated in the first phase remains unchanged and the piston 84 is rigidly clamped by relatively large forces due to the stable pressure conditions on both piston sides.
  • the metering slide 73 remains quietly in its position.
  • the transmitter 77 continues to move in the direction of the switching contact 79 or on the pneumatic valve 80, the latter being the transmitter 77 runs on and, at a set threshold value, again emits a corresponding control signal as an increased pressure value in the control line 82.
  • a pneumatic control signal is predetermined or triggered approximately according to FIG. 2 or FIG. 3. Depending on the precondition, a stable equilibrium can be established over a uniform signal curve, as can be seen from FIG. 3.
  • control pressure in line 119 can be used for the optical display of the respective position of the rollers.
  • compressed air e.g. a colored buckle can be moved behind a glass eye 120, so that the engagement or disengagement of the grinding rollers by appropriate colors, for. B. red and green, is displayed.
  • the pneumatic control signal in the control line 82 can also be used to set the grinding rollers independently of the power.
  • the grinding gap can be kept constant when the metering capacity is increased by increasing the grinding pressure, or it can also be reduced or enlarged.
  • a corresponding grinding gap control device can consist directly of a pneumatic cylinder or other suitable mechanical or electrical means, which can also be connected to a remote control (such as a computer or process computer), which then specifies a basic value for the respective grinding task, which Depending on the output, the pneumatic control signal adjusts the instantaneous output in the roller mill.
  • other training courses can also be carried out here or other functions can be carried out, e.g. B. with regard to the limit value, with regard to safety circuits, etc.
  • it can also be controlled as a function of the feed power or by means of the pneumatic control signal.
  • the pneumatic control signal can be used to control both the feed rate and the engagement and disengagement of the grinding rollers.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Devices For Medical Bathing And Washing (AREA)
  • Steroid Compounds (AREA)
  • Ticket-Dispensing Machines (AREA)
  • Adjustment And Processing Of Grains (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

According to the method, a mechanical control signal is generated according to the product supply for the control of a metering valve (9). To obtain powerful control operation with a high precision and reliability and of a simple and compact construction, the mechanical control signal is first transformed into a pneumatic signal which is transmitted as an input signal to a servocontrol (41) for regulating the product supply and/or to a servocontrol (18) for the start up or shut down of the milling cylinder. A device specially adapted to this method is a cylinder mill which comprises a mechanical signal transmitter (13, 15) operating a pneumatic regulating valve (17) of which the output is connected to the input of a servocontrol (18) actuating the metering valve (9) and/or the start up and shut down of milling cylinders (1, l', 2, 2').

Description

rstellbaren Dosierschieber vorgenommen wird, wobei ein mechanischer Signalgeber in Abhängigkeit von der Produktzufuhr ein Geberglied auslenkt, das einen in ein pneumatisches Ventil eindrückbaren Schaltkontakt betätigt, der bei steigender Produktzufuhr durch das Geberglied eingedrückt wird, wobei der Eingang des Ventiles an eine Druckluftleitung angeschlossen und zur Verstellung des Dosierschiebers eine Servoeinrichtung vorgesehen ist.adjustable metering slide is carried out, a mechanical signal transmitter depending on the product supply deflects a transmitter element which actuates a switch contact which can be pressed into a pneumatic valve and which is pressed in by the transmitter element when the product supply increases, the input of the valve being connected to a compressed air line and for adjustment of the metering slide a servo device is provided.

In der CH-A 418791 ist ein Müllerei-Walzenstuhl beschrieben, dessen leistungsabhängige Elemente über ein zentrales elektrokapazitatives Speisemengen-Messgerät gesteuert werden, mittels dessen das Vorhandensein eines ausreichenden Produktdepots im Speiseraum über eine Speisewalze festgestellt und entsprechend elektrische Steuersignale an elektropneumatische Ventile zur Steuerung u. a. der Stellung eines Dosierschiebers gegeben werden. Hierbei zeigt es sich allerdings bei besonders schwierigen Produkten, dass die Regelung der Speiseleistung nicht immer ganz angeglichen ist, weil Produkt an der kapazitativen Sonde haften bleiben kann, was eine Feinregulierung erschwert.In CH-A 418791 a milling roller mill is described, the performance-dependent elements of which are controlled via a central electrocapacitive feed quantity measuring device, by means of which the presence of a sufficient product depot in the dining area is ascertained via a feed roller and corresponding electrical control signals at electropneumatic valves for control and. a. be given the position of a metering slide. In the case of particularly difficult products, however, this shows that the regulation of the feed power is not always completely harmonized because the product can stick to the capacitive probe, which makes fine adjustment difficult.

In der DE-C 582423 ist eine Kombination elektrischer und mechanischer Steuerungsmittel beschrieben, die auch zum Einsatz bei grösseren Steuerungskräften geeignet sind, deren baulicher Aufwand allerdings gerade durch die Verwendung eines mechanischen und eines elektrischen Systems ganz erheblich ist.DE-C 582423 describes a combination of electrical and mechanical control means which are also suitable for use with larger control forces, but the structural outlay is very considerable, in particular due to the use of a mechanical and an electrical system.

Bei der Anordnung aus der DE-C 817069 wird das mechanische Ausgangssignal direkt zur Steuerung eines nachgeschalteten Servomotors eingesetzt, wobei das mechanische Geberglied direkt das Ein/Aus-Steuerungsventil am Gehäuse des Servomotors beaufschlagt. In Abhängigkeit von der belastungsbedingten Auslenkung des mechanischen Gebergliedes betätigt dann der Servomotor über seinen Ausgang und eine zwischengeschaltete Heberuntersetzung direkt den Dosierschieber. Schwankungen in der Zufuhr des Produktes resultieren in entsprechenden Schwankungen der Dosiersteuerung.In the arrangement from DE-C 817069, the mechanical output signal is used directly to control a downstream servo motor, with the mechanical transmitter element acting directly on the on / off control valve on the housing of the servo motor. Depending on the deflection of the mechanical encoder element due to the load, the servo motor directly actuates the metering slide via its output and an intermediate gear reduction. Fluctuations in the supply of the product result in corresponding fluctuations in the metering control.

In der CH-A 275417 ist schliesslich eine Steuerungsanordnung der eingangs genannten Art beschrieben, bei der in Abhängigkeit von der Produktzufuhr das mechanische Geberglied zur Auslenkung gebracht wird und einen Steuerstift eines Pneumatikzylinders betätigt. Das Gehäuse des Pneumatikzylinders ist starr am Walzengestell befestigt und die in Abhängigkeit von der Auslenkung des Gebergliedes über den Steuerstift ausgelöste Verschiebebewegung des Kolbens des Pneumatikzylinders wird wiederum direkt über zwischengeschaltete Hebel zur Einstellung des Dosierschiebers benutzt.Finally, CH-A 275417 describes a control arrangement of the type mentioned at the outset, in which, depending on the product supply, the mechanical encoder member is deflected and actuates a control pin of a pneumatic cylinder. The housing of the pneumatic cylinder is rigidly attached to the roller frame, and the displacement movement of the piston of the pneumatic cylinder triggered by the control pin depending on the deflection of the encoder member is in turn used directly via intermediate levers to adjust the metering slide.

Ausgehend hiervon liegt die der Erfindung zugrundeliegende Aufgabe darin, eine Einrichtung der eingangs genannten Art so weiterzuentwikkeln, dass sie bei relativ einfachem Aufbau und geringem Aufwand eine im besonderen Mass konstante Produktzuleitung sowie eine besonders gute Konstanthaltung des Produktniveaus selbst bei starken Leistungsschwankungen ermöglicht.Proceeding from this, the object on which the invention is based is to further develop a device of the type mentioned at the outset in such a way that, with a relatively simple structure and little effort, it enables a particularly constant product feed and a particularly good maintenance of the product level even in the event of large fluctuations in performance.

Erfindungsgemäss wird diese Aufgabe bei einer Einrichtung der eingangs genannten Art dadurch gelöst, dass der Ausgang des pneumatischen Ventiles über eine Steuerleitung mit dem Eingang der Servoeinrichtung verbunden ist, das pneumatische Ventil in eine Ausschaltstellung, in der sich der Schaltkontakt in ausgefahrener Position befindet, und in eine Einschaltstellung, bei welcher der Schaltkontakt ganz eingedrückt ist, sowie in eine zwischen beiden Schaltstellungen liegende Nullstellung schaltbar ist, bei der sich der Schaltkontakt in einer mittleren Eindrückposition befindet und beide Leitungen gesperrt sind, wobei der Schaltkontakt beim Eindrücken in Richtung auf seine ausgefahrene Stellung hin vorgespannt wird, und dass bei einer Verstellbewegung der Servoeinrichtung das Gehäuse des pneumatischen Ventiles relativ zum Geberglied stets in Richtung auf ein Einstellen seiner Null- stellung bewegt wird. Die Erfindung ermöglicht es, mit einem mechanischen Signalgeber über eine Nachlaufsteuerung unter Einsatz eines Ventiles mit einer mittleren Null-Schalt-Stellung die Produktspeisung für einen Walzenstuhl über eine Servoeinrichtung empfindlich zu regeln. Der erfindungsgemäss geforderte Einsatz eines Drei-Schaltstellungs-Ventiles, das jeder Bewegung des Gebergliedes mit Verzögerung nachläuft, führt, wie die Praxis zeigt, zu einer Regelung, bei der wirklich eine gut konstante Produktzuleitung und eine vorzügliche Konstanthaltung des Produktniveaus im Speiseraum selbst bei starken kurzzeitigen Stossbelastungen in der Produktspeisung erreichbar ist.According to the invention, this object is achieved in a device of the type mentioned in the introduction in that the output of the pneumatic valve is connected to the input of the servo device via a control line, the pneumatic valve in an off position, in which the switch contact is in the extended position, and in a switch-on position, in which the switch contact is fully depressed, and switchable into a zero position between the two switch positions, in which the switch contact is in a middle press-in position and both lines are blocked, the switch contact when pressed in the direction of its extended position is preloaded, and that during an adjustment movement of the servo device, the housing of the pneumatic valve is always moved relative to the transmitter element in the direction of setting its zero position. The invention makes it possible, with a mechanical signal transmitter, to regulate the product feed for a roller mill sensitively via a servo device by means of a follow-up control using a valve with an intermediate zero switching position. The use of a three-position valve, which is required according to the invention and which follows every movement of the transmitter element with a delay, leads, as practice shows, to a regulation in which a really constant product supply line and an excellent constant level of the product level in the dining area, even in the case of strong short-term ones Shock loads in the product feed can be achieved.

Eine vorteilhafte Ausgestaltung der erfindungsgemässen Einrichtung besteht auch darin, dass ein zweites vom Steuerdruck in der Steuerleitung des pneumatischen Ventiles beaufschlagtes Ventil, zum Steuern des Ein- und Ausrückens von Mahlwalzen vorgesehen ist.An advantageous embodiment of the device according to the invention also consists in that a second valve, acted upon by the control pressure in the control line of the pneumatic valve, is provided for controlling the engagement and disengagement of grinding rollers.

Eine besonders einfach aufgebaute wirksame und betriebssichere Ausgestaltung der erfindungsgemässen Einrichtung wird dadurch erreicht, dass ein mit seinem einen Ende verschwenkbar am Walzenstuhlrahmen befestigter Hebelarm vorgesehen ist, an dem sowohl das Gehäuse des pneumatischen Ventiles wie auch ein Verstellglied für den Dosierschieber wie auch die Kolbenstange der ebenfalls am Walzenstuhlrahmen angeordneten Servoeinrichtung befestigt sind, wobei das Gehäuse des pneumatischen Ventiles am freien Ende des Hebelarms sitzt, dass weiterhin die Servoeinrichtung einen Pneumatikzylinder mit Kolben und Kolbenstange aufweist, und dass die Steuerseite des Kolbens über die Steuerleitung mit dem Steuerdruck des pneumatischen Ventiles beaufschlagt wird, während die andere Kolbenseite unter Einwirkung einer Vorspannkraft steht. Bei dieser Ausgestaltung bildet die Servoeinrichtung zusammen mit dem einseitig am Walzenstuhl angelenkten Hebelarm eine Funktionseinheit, bei der mit wenigen bewegten Teilen eine wirksame und betriebssichere Regelung der Speiseleistung möglich ist. Der erforderliche bauliche Aufwand ist überraschend gering. Dabei ist es von Vorteil, wenn am Hebelarm auch Glieder zum Verstellen der Drehzahl der Speisewalzen befestigt sind, wobei eine Regulierung der Speiseleistung alternativ oder gleichzeitig mittels Dosierschieber einerseits und Speisewalzendrehzahl andererseits möglich ist.A particularly simple construction of an effective and reliable design of the device according to the invention is achieved in that a lever arm is attached with its one end pivotable to the roller frame, on which both the housing of the pneumatic valve and an adjusting member for the metering slide as well as the piston rod also are provided servo devices arranged on the roller mill frame, the housing of the pneumatic valve being seated at the free end of the lever arm, the servo device further comprising a pneumatic cylinder with piston and piston rod, and the control side of the piston being acted upon by the control pressure of the pneumatic valve via the control line, while the other side of the piston is under the influence of a preload. In this embodiment, the servo device forms together with the lever articulated on one side on the roller mill poor a functional unit in which effective and reliable control of the feed power is possible with just a few moving parts. The structural effort required is surprisingly low. It is advantageous if links for adjusting the speed of the feed rollers are also attached to the lever arm, wherein regulation of the feed power is possible alternatively or simultaneously by means of a metering slide on the one hand and feed roller speed on the other.

Eine besonders vorteilhafte Ausgestaltung der erfindungsgemässen Einrichtung besteht auch darin, dass das pneumatische Ventil als Membranventil ausgebildet ist, das durch einen Stössel oder einen Rollenhebel geschaltet wird, der eine Entlüftungsöffnung aufweist. Vorzugsweise ist die der Steuerseite des Kolbens zum Einstellen des Dosierschiebers abgewendete Kolbenseite über eine Druckfeder in Richtung auf eine geschlossene Stellung des Dosierschiebers hin vorgespannt.A particularly advantageous embodiment of the device according to the invention also consists in the pneumatic valve being designed as a diaphragm valve which is switched by a tappet or a roller lever which has a vent opening. The piston side facing away from the control side of the piston for adjusting the metering slide is preferably biased by a compression spring in the direction of a closed position of the metering slide.

Die Anwendung der erfindungsgemässen Einrichtung in der Praxis hat gezeigt, dass bei einer gleichmässigen Produktzufuhr auch das Produktniveau im Speiseraum oberhalb der Dosierwalzen konstant blieb. Des weiteren hat sich gezeigt, dass auch dann, wenn sehr starke Leistungsschwankungen auftraten, durch die erfindungsgemässe Anordnung die Dosierleistung bestens diesen Leistungsschwankungen angepasst wurde, wobei im Steuerungsverhalten gleichzeitig eine starke Glättung erzielt werden konnte. Stets hat sich auch gezeigt, dass die Funktionssicherheit ausserordentlich gross war.The application of the device according to the invention in practice has shown that with a uniform product supply, the product level in the dining area above the metering rollers also remained constant. Furthermore, it has been shown that even if very strong power fluctuations occurred, the metering power was optimally adapted to these power fluctuations by the arrangement according to the invention, with a strong smoothing being achieved at the same time in the control behavior. It has always been shown that the functional reliability was extremely high.

Die Erfindung wird nachfolgend anhand der Zeichnungen im Prinzip beispielshalber noch näher erläutert. Es zeigen:

  • Figur 1 eine schematisch dargestellte Ausführungsform für eine erfindungsgemässe Steuerungsanordnung;
  • Figur 2 und Figur 3 den gemessenen Druckverlauf eines pneumatischen Regelsignales zu einer Ausführung gemäss Figur 1;
  • Figur 4 ein vollständiges Steuerschema bei einer erfindungsgemässen Anordnung an einem Müllerei-Walzenstuhl mit Speiseregulierung, kombiniert mit automatischer Walzenein- und -Ausrückung;
The invention is explained in more detail below in principle by way of example with reference to the drawings. Show it:
  • Figure 1 is a schematically illustrated embodiment for a control arrangement according to the invention;
  • Figure 2 and Figure 3 shows the measured pressure curve of a pneumatic control signal for an embodiment according to Figure 1;
  • FIG. 4 shows a complete control diagram in the case of an arrangement according to the invention on a milling roller mill with feed regulation, combined with automatic roller engagement and disengagement;

In Figur 1 ist schematisch eine Produkt-Speiseregelung gezeigt: in der linken Bildhälfte ist der Speiseraum 70 wiedergegeben, der unten durch eine Verteilwalze 71, eine Speisewalze 72 sowie einen Dosierschieber 73 abgeschlossen ist. Im Speiseraum 70 ist eine Sonde 74 angeordnet, die über einen Träger 75 an einem Drehbolzen 76 abgestützt ist. Der Träger 75 weist einen Geber 77 auf, der einerseits mit einer Zugfeder 78 sowie andererseits mit einem Rollenhebel 79 eines pneumatischen Ventiles 80 in Wirkverbindung steht. Das pneumatische Ventil 80 ist eingangsseitig an eine Druckluftleitung 81 angeschlossen; eine Steuerleitung 82 führt von dem pneumatischen Ventil 80 an einen Servozylinder 83 zur Beaufschlagung eines darin befindlichen Kolbens 84 auf dessen einer Seite. Weiterhin ist eine Kolbenstange 85 vorgesehen, die endseitig mit einem Gelenkbolzen 86 an einem Hebelarm 87 befestigt ist, der seinerseits um ein Drehgelenk 88 gelenkig an der festen Rahmenkonstruktion 89 fixiert ist. Das pneumatische Ventil ist am anderen Ende des Hebelarmes 87 befestigt und folgt dabei entsprechend den Hebelgesetzen, der Bewegung der Kolbenstange 85 bzw. dem Hebelarm 87. An letzterem ist ferner ein Dosierschieber 73 über eine Verbindungslasche 91 bzw. über Bohlen 92 und 93 kraftschlüssig befestigt. Der Dosierschieber 73 ist um ein Drehlager 94 kippbar, wobei sich, je nach seiner momentanen Stellung, zwischen ihm und der Speisewalze 72 ein Dosierspalt einstellt. Das ganze System wird von einer Druckversorgung 95 gespeist.A product feed control is shown schematically in FIG. 1: in the left half of the figure, the feed area 70 is shown, which is closed at the bottom by a distribution roller 71, a feed roller 72 and a metering slide 73. A probe 74 is arranged in the dining area 70 and is supported on a pivot pin 76 by a support 75. The carrier 75 has a transmitter 77 which is operatively connected on the one hand to a tension spring 78 and on the other hand to a roller lever 79 of a pneumatic valve 80. The pneumatic valve 80 is connected on the input side to a compressed air line 81; a control line 82 leads from the pneumatic valve 80 to a servo cylinder 83 to act on a piston 84 located therein on one side thereof. Furthermore, a piston rod 85 is provided, which is fastened at the end with a hinge pin 86 to a lever arm 87, which in turn is articulated on the fixed frame structure 89 about a swivel joint 88. The pneumatic valve is fastened to the other end of the lever arm 87 and follows the lever laws, the movement of the piston rod 85 and the lever arm 87. A metering slide 73 is also non-positively fastened to the latter via a connecting bracket 91 or planks 92 and 93. The metering slide 73 can be tilted about a pivot bearing 94, a metering gap being established between it and the feed roller 72, depending on its current position. The entire system is fed by a pressure supply 95.

Die Druckluft für die Steuerseite kann zusätzlich über einen Handschalter 98 unterbrochen werden, etwa um Servicearbeiten durchzuführen. Der Systemdruck wird durch die genannte Versorgung ständig auf einem konstanten Druck gehalten, der (z.B. im Wert von 6 bar) über eine Leitung 99 als Gegendruck auf die dem Steuerdruck abgekehrte Seite des Kolbens 84 abgegeben wird. An Stelle des genannten konstanten Druckes über die Leitung 99 kann auch eine Feder 100 oder beides gemeinsam eingesetzt werden. Die Verwendung einer Feder 100 ergibt den Vorteil, dass bei Ausfall der Druckluft der Dosierschieber sicher schliesst.The compressed air for the control side can also be interrupted via a hand switch 98, for example to carry out service work. The system pressure is kept constantly at a constant pressure by the supply mentioned, which pressure (e.g. at a value of 6 bar) is delivered via a line 99 as a counterpressure to the side of the piston 84 which is away from the control pressure. Instead of the constant pressure mentioned via line 99, a spring 100 or both can also be used together. The use of a spring 100 has the advantage that the metering slide closes securely if the compressed air fails.

In Figur 2 ist der Druckverlauf des Regelsignals, wie er in der Steuerleitung 82 mit einem Druckschreiber festgestellt werden kann, gezeigt. Die Werte entsprechen der Messung an einem Walzenstuhl einer B-Passage. Während einer ersten Phase von etwa 50 sec. ist der Druck dabei auffallend stabil und nur kurzzeitig (bei etwa 29 sec.) durch eine kurze Druckerhöhung unterbrochen. Der im wesentlichen horizontale Verlauf der Kurve zeigt, dass ganz kurzzeitige Leistungsvariationen im Regelsignal weitergegeben werden. Bei ca. 50 sec. wird der ganze Regelkreis durch Handausrückung der Mahlwalzen künstlich unterbrochen, wodurch das Regelsignal entsprechend sofort auf den Wert null abfällt. Das rasche Ansprechen der Regelung auf eine entsprechende Störfunktion ist sehr vorteilhaft. Ganz besonders wichtig ist aber der Beginn der Regelung nach dem Einrücken der Mahlwalzen. Das Auslaufen des Regelsignales dauert entsprechend der Messung des Druckschreibers etwa 1 sec. Der Wiederbeginn des Signales tritt nahezu ohne Zeitverzug auf und das Signal geht, was regelungstechnisch besonders interessant ist, sofort auf einen etwa mittleren Wert über, pendelt dann während etwa 10 sec. um diesen Wert und leitet sodann sofort wieder in ein stabiles Regelverhalten über. Besonders bemerkenswert ist die schnelle Reaktion bei der Veränderung, die fast ohne jegliches Übersteuern und ohne Aufschaukelungen stattfindet.FIG. 2 shows the pressure curve of the control signal, as can be determined in the control line 82 using a pressure recorder. The values correspond to the measurement on a roller mill of a B passage. During a first phase of about 50 seconds, the pressure is remarkably stable and only briefly (at about 29 seconds) is interrupted by a short pressure increase. The essentially horizontal course of the curve shows that very short-term power variations are passed on in the control signal. At approx. 50 seconds, the entire control loop is artificially interrupted by manually disengaging the grinding rollers, which means that the control signal immediately drops to zero. The rapid response of the control to a corresponding malfunction is very advantageous. However, it is particularly important to start the control after the grinding rollers are engaged. According to the measurement of the pressure recorder, the control signal runs out for about 1 sec. The restart of the signal occurs almost without delay and, which is particularly interesting from a control point of view, the signal immediately goes to an approximately medium value, then swings for about 10 seconds this value and then immediately leads back to a stable control behavior. Particularly noteworthy is the quick reaction to the change, which takes place with almost no oversteer and no rocking.

In Figur 2 sind ständig wiederkehrende konstante Regelperioden von 5 bis 10 sec. gezeigt, die allesamt innerhalb eines verhältnismässig engen Regelbereiches liegen. Für die Mahlwalzen und für die Walzenlagerung ist dies sehr wichtig, da damit durch die Speiseregelvorrichtung eine Schwingungsaufschaukelung durch ständig wechselnde Mahlkräfte verhindert werden kann.FIG. 2 shows constantly recurring constant control periods of 5 to 10 seconds, all of which lie within a relatively narrow control range. For the grinding rollers and this is very important for the roller bearing, since it can be prevented by the feed control device from vibrating due to constantly changing grinding forces.

In Figur 3 ist das Regelsignal bei einer C-Passage (d. h. bei einer hinteren Passage) gezeigt, bei der die dem Walzenstuhl zugeführte Produktmenge über kürzere und längere Perioden hinweg fast nicht variiert. Dieser Fall ist regelungstechnisch besonders leicht beherrschbar. Etwa 5 sec. nach Messbeginn war die Produktzufuhr kurzzeitig gestört, was sogleich einen entsprechenden Abfall beim Regelsignal auslöst. Der nachfolgend sich einstellende Kurvenverlauf ist regelungstechnisch beinahe als eine Art «Idealverlauf» anzusehen. Auch bei diesem wurden nach etwa 115 sec. die Mahlwalzen kurzzeitig von Hand aus- und danach sogleich ohne Zeitverzug wieder eingerückt. Der dargestellte Diagrammverlauf zeigt erstaunlicherweise, dass sich nach einer sehr geringen Übersteuerung schon nach etwa 1 bis 2 sec. der gleiche Regelwert wie vor der künstlichen Störung wieder einstellt und die ursprüngliche Kurve ihren Fortgang findet.In Figure 3, the control signal is shown for a C passage (i.e. a rear passage) in which the amount of product fed to the roll mill hardly varies over shorter and longer periods. This case is particularly easy to control in terms of control technology. About 5 seconds after the start of the measurement, the product supply was briefly disrupted, which immediately triggered a corresponding drop in the control signal. In terms of control technology, the curve curve that follows is almost a kind of “ideal curve”. In this case too, the grinding rollers were briefly removed by hand after about 115 seconds and then immediately reinserted without delay. The diagram shown shows, surprisingly, that after a very slight override, the same control value as before the artificial disturbance is restored after about 1 to 2 seconds and the original curve continues.

In Figur 4 ist eine Ausführungsform gezeigt, bei der die im wesentlichen in Figur 1 gezeigte Speiseregulierung mit einer Walzenein- und -ausrückung kombiniert ist.FIG. 4 shows an embodiment in which the feed regulation shown essentially in FIG. 1 is combined with a roller engagement and disengagement.

In Figur 4 ist eine Ausführungsform für einen typischen Mühlereiwalzenstuhl mit Doppelausführung für die eigentliche Vermahlungseinheit dargestellt.FIG. 4 shows an embodiment for a typical mill roller mill with a double design for the actual grinding unit.

Mittels eines zentralen Steuerventils 96 können alle Walzen Wal, Wa2... mit Hilfe der Schnellentlüfter 97 ausgerückt werden.By means of a central control valve 96, all the rollers Wa 1 , Wa 2 ... can be disengaged with the aid of the quick breather 97.

Der Kolben 120 ist über eine Kolbenstange 121 mit der beweglichen Walze bzw. dem entsprechenden Walzenlager gekoppelt.The piston 120 is coupled to the movable roller or the corresponding roller bearing via a piston rod 121.

Zusätzlich ist aber auch noch dargestellt, dass der Servozylinder für die Walzenein- und -ausrückung an jedem Walzenende, also insgesamt 4 fach, vorgesehen ist.In addition, however, it is also shown that the servo cylinder for the roller engagement and disengagement is provided at each roller end, ie a total of 4 times.

Die Funktionsweise eines Mühlerei-Walzenstuhles nach einem der gezeigten Ausführungsbeispiele entsprechend Figuren 1 bis 4 ist wie folgt:The operation of a mill mill according to one of the exemplary embodiments shown corresponding to Figures 1 to 4 is as follows:

Der Mahlspalt der Mahlwalzen wird über ein Handrad entsprechend dem zu vermahlenden Gut vorgewählt. Wird über den Speiseraum 70 noch kein Mahlgut eingespeist, so wird die Sonde 74 über eine Zugfeder 78 nach oben gedrückt. Der Geber 77 berührt den Schaltkontakt 79 des pneumatischen Ventils 80 nicht, so dass in der Steuerleitung 82 kein Druck aufgebaut wird. Die Feder 100 oder der Druck aus der Leitung 99 (oder beides, je nach Wahl des Systems) drücken den Hebelarm 87 gegen den Uhrzeigersinn und damit den Dosierschieber 73 in eine geschlossene Stellung. Der Dosierspalt ist geschlossen, so dass auch kein Produkt auf die Mahlwalzen ausdosiert wird. Bei Ausbleiben eines Regelsignales in der Steuerleitung 82 bzw. 115 steht auch am Verstärkerventil 116 kein Steuerdruck an, weshalb sich die Mahlwalzen über die Zylinder 118 in ausgerückter Position befinden.The grinding gap of the grinding rollers is selected according to the material to be ground using a handwheel. If no regrind is being fed in via the dining area 70, the probe 74 is pressed upwards by a tension spring 78. The transmitter 77 does not touch the switch contact 79 of the pneumatic valve 80, so that no pressure is built up in the control line 82. The spring 100 or the pressure from the line 99 (or both, depending on the choice of system) push the lever arm 87 counterclockwise and thus the metering slide 73 into a closed position. The metering gap is closed so that no product is metered onto the grinding rollers. If there is no control signal in the control line 82 or 115, there is also no control pressure at the booster valve 116, which is why the grinding rollers are in the disengaged position via the cylinders 118.

Wird nun Mahlgut über den Speiseraum 70 dem Walzenstuhl zugeführt, so wirkt sofort der Impuls des strömenden Gutes bzw. eine entsprechende Gewichtskomponente auf die Sonde 74, die dadurch nach unten gedrückt wird. Der Geber 77 bewegt sich nach rechts, drückt den Schaltkontakt 79 ein, und löst hierdurch ein Regelsignal aus.If ground material is now fed to the roller mill via the dining area 70, the impulse of the flowing material or a corresponding weight component acts immediately on the probe 74, which is thereby pressed downwards. The encoder 77 moves to the right, presses in the switch contact 79, and thereby triggers a control signal.

In der Steuerleitung 82 baut sich nun ein Druck auf, der jedoch vorerst keine Änderung in der Signalgebung verursacht. Sobald jedoch der Druck einen eingestellten Schwellwert erreicht hat, werden die Mahlwalzen eingerückt. Hierbei handelt es sich um einen dynamischen Vorgang. Die Sonde 74 ist mit dem Geber 77 in Bewegung, d. h. der Schaltkontakt 79 wird in einem Zug voll auf das pneumatische Ventil 80 gedrückt. Vom Geber 77 wird, insbesondere bei Einsatz eines sehr empfindlichen Membranventiles für das pneumatische Ventil 80, schon durch kleinste Bewegungen der maximale Regeldruck in der Steuerleitung 82 freigegeben. Hieraus resultiert, dass die Kolbenstange 85 mit dem Hebel 87 sowie dem pneumatischen Ventil 80 in einem Zeitraum von Hundertstel- oder Zehntel-Sekunden in Bewegung gesetzt werden, wobei sich der direkt verbundene Dosierschieber zu öffnen beginnt und Produkt auf die Mahlwalzen eingespeist wird. Sowohl der Zylinder 118 wie auch der Zylinder 83 sind als pneumatische Servozylinder ausgeführt, wodurch die Arbeitskräfte schnell, aber dennoch nicht schlagartig erzeugt werden. Die Luft im Zylinder bildet im Gegensatz zu Hydraulikmedien eine Art «Stossdämpfer». Es hat sich gezeigt, dass durch geeignete Wahl der Zug- und Druckfedern der Querschnitte in den pneumatischen Leitungen sowie entsprechender Vorspannungen der Federn ein im Hinblick auf die betroffenen Maschinenelemente vollkommener Gleichlauf der Steuer- bzw. Regelfunktionen sich erreichen lässt. Dies gilt sowohl beim Einlauf- wie beim Auslauffall.A pressure now builds up in the control line 82, but this initially does not cause any change in the signaling. However, as soon as the pressure has reached a set threshold, the grinding rollers are engaged. This is a dynamic process. The probe 74 is in motion with the transmitter 77, i. H. the switch contact 79 is fully pressed onto the pneumatic valve 80 in one go. The transmitter 77 releases the maximum control pressure in the control line 82 even with the smallest movements, particularly when using a very sensitive diaphragm valve for the pneumatic valve 80. As a result, the piston rod 85 with the lever 87 and the pneumatic valve 80 are set in motion in a period of hundredths or tenths of a second, with the directly connected metering slide starting to open and product being fed onto the grinding rollers. Both the cylinder 118 and the cylinder 83 are designed as pneumatic servo cylinders, as a result of which the workforce is generated quickly but not suddenly. In contrast to hydraulic media, the air in the cylinder forms a kind of “shock absorber”. It has been shown that a suitable choice of the tension and compression springs of the cross-sections in the pneumatic lines and corresponding preloads of the springs can achieve a perfect synchronization of the control functions with regard to the machine elements concerned. This applies to both the entry and exit cases.

Für den weiteren Bewegungsablauf wird auf die Figuren 1 und 4 verwiesen: der Hebelarm 87 führt bei Einsetzen der Produktspeisung als erste Phase eine kleine Schwenkbewegung im Uhrzeigersinn aus. Gleichzeitig mit dieser läuft auch der Schaltkontakt 79 vom Geber 77 weg. Die Zugfeder 78 spannt sich proportional zum Wegstück des Gebers 77. Wird nur eine geringe Produktmenge über den Glaszylinder eingespeist, so stellt sich zwischen den Mahlgutkräften auf die Sonde 74 sehr rasch ein Gleichgewicht ein, bei dem das Speisesegment 73, der Hebelarm 87 und das pneumatische Ventil 80 in ihrer Position verharren bleiben. Gleichzeitig aber sind Geber 77 und Schaltkontakt 79, der über eine Feder in das pneumatische Venil 80 eingeschoben werden kann, in ständiger gegenseitiger Wirkverbindung, wobei kleinste Bewegungen auftreten, die allerdings, was einen wesentlichen Vorteil darstellt, keinen direkten Einfluss mehr auf das umgewan-. delte pneumatische Regelsignal ausüben. Das pneumatische Ventil 80 verweilt in dieser Phase in einer Null-Stellung, bei der alle Ein- und Ausgänge verschlossen sind. Dadurch bleibt der in der ersten Phase erzeugte Druckwert des pneumatischen Regelsignals unverändert erhalten und der Kolben 84 durch die stabilen Druckverhältnisse auf beiden Kolbenseiten mit verhältnismässig grossen Kräften starr eingespannt. Der Dosierschieber 73 verweilt ruhig in seiner Position. Wird nun die Zufuhr des Gutes gesteigert oder wird aus anderen Gründen die im Speiseraum zugeführte Leistung grösser als die durch den Dosierspalt abgeführte Leistung, so verschiebt sich der Geber 77 weiterhin in Richtung Schaltkontakt 79 bzw. auf das pneumatische Ventil 80, wobei letzteres dem Geber 77 nachläuft und bei einem eingestellten Schwellwert erneut ein entsprechendes Regelsignal als erhöhten Druckwert in die Steuerleitung 82 abgibt. Je nach Gegebenheit, z.B. auch dann, wenn es sich um einen Anfahrvorgang o.ä. handelt, wird ein pneumatisches Regelsignal etwa entsprechend Figur 2 bzw. Figur 3 vorgegeben bzw. ausgelöst. Je nach Vorbedingung kann sich ein stabiles Gleichgewicht über einen gleichmässigen Signalverlauf einstellen, wie dies aus Figur 3 ersichtlich ist. Es können aber auch bei ständig schwankenden Zufuhrleistungen einzelne Perioden stabiler Lagen, in denen das pneumatische Ventil 80 an irgendeiner beliebigen Stelle des Hebelarmes 87 sich befindet, sich in der Null-Stellung abwechseln. Die gezeigte Regelung ist damit imstande, entweder ein sehr gleichmässiges Regelsignal zu erzeugen (vgl. Figur 3) oder aber, bei sehr variabler Speiseleistung ein Signal von wiederholt stabilen Phasen aufzuweisen (vgl. Figur 2).For the further sequence of movements, reference is made to FIGS. 1 and 4: the lever arm 87 executes a small swiveling movement clockwise when the product feed is inserted as the first phase. Simultaneously with this, the switching contact 79 also runs away from the transmitter 77. The tension spring 78 tensions in proportion to the distance of the encoder 77. If only a small amount of product is fed in via the glass cylinder, then a balance is established very quickly between the regrind forces on the probe 74, in which the feed segment 73, the lever arm 87 and the pneumatic one Valve 80 remain in position. At the same time, however, the transmitter 77 and the switching contact 79, which can be inserted into the pneumatic valve 80 via a spring, are in constant mutual interaction, whereby the smallest movements occur, which, however, which is a significant advantage, no longer have a direct influence on the changed. exert pneumatic control signal. The pneumatic valve 80 remains in this phase in a zero position, with all on and off aisles are closed. As a result, the pressure value of the pneumatic control signal generated in the first phase remains unchanged and the piston 84 is rigidly clamped by relatively large forces due to the stable pressure conditions on both piston sides. The metering slide 73 remains quietly in its position. If the supply of the goods is now increased or the power supplied in the dining room is greater than the power discharged through the metering gap for other reasons, the transmitter 77 continues to move in the direction of the switching contact 79 or on the pneumatic valve 80, the latter being the transmitter 77 runs on and, at a set threshold value, again emits a corresponding control signal as an increased pressure value in the control line 82. Depending on the circumstances, e.g. also when it comes to a start-up process or the like. acts, a pneumatic control signal is predetermined or triggered approximately according to FIG. 2 or FIG. 3. Depending on the precondition, a stable equilibrium can be established over a uniform signal curve, as can be seen from FIG. 3. However, even with constantly fluctuating feed rates, individual periods of stable positions, in which the pneumatic valve 80 is located at any point on the lever arm 87, can alternate in the zero position. The control shown is thus able either to generate a very uniform control signal (see FIG. 3) or, if the supply power is very variable, to have a signal of repeatedly stable phases (see FIG. 2).

Wie aus Figur 4 ersichtlich kann der Steuerdruck in der Leitung 119 zur optischen Anzeige der jeweiligen Stellung der Walzen ausgenützt werden. Mit der Druckluft kann z.B. eine farbige Koppe hinter einem Glasauge 120 verschoben werden, so dass das Ein- bzw. das Ausrücken der Mahlwalzen durch entsprechende Farben, z. B. rot und grün, angezeigt wird.As can be seen from FIG. 4, the control pressure in line 119 can be used for the optical display of the respective position of the rollers. With compressed air e.g. a colored buckle can be moved behind a glass eye 120, so that the engagement or disengagement of the grinding rollers by appropriate colors, for. B. red and green, is displayed.

Ferner kann das pneumatische Regelsignal in der Steuerleitung 82 auch dafür eingesetzt werden, um die Mahlwalzen leistungsunabhängig einzustellen. So kann etwa der Mahlspalt bei Erhöhung der Dosierleistung durch Erhöhung des Mahldruckes konstant gehalten oder aber auch verkleinert oder vergrössert werden. Eine entsprechende Mahlspalt-Regelvorrichtung kann direkt aus einem Pneumatik-Zylinder oder aus anderen geeigneten mechanischen oder elektrischen Mitteln bestehen, die zugleich an eine Fernsteuerung (etwa an einen Computer oder Prozessrechner) angeschlossen sein können, die dann für die jeweilige Mahlaufgabe einen Grundwert vorgibt, der leistungsabhängig durch das pneumatische Regelsignal der Momentanleistung im Walzenstuhl angepasst wird. Es versteht sich von selbst, dass hier auch noch andere Weiterbildungen vorgenommen oder andere Funktionen ausgeführt werden können, z. B. bezüglich des Grenzwertes, bezüglich Sicherheitsschaltungen usw. Besonders vorteilhaft ebenfalls in Abhängigkeit von der Speiseleistung bzw. mittels des pneumatischen Regelsignals gesteuert werden kann. Weiterhin bemerkenswert ist, dass über das pneumatische Regelsignal gleichzeitig sowohl die Speiseleistung geregelt, wie auch die Ein- und Ausrückung der Mahlwalzen gesteuert werden kann.Furthermore, the pneumatic control signal in the control line 82 can also be used to set the grinding rollers independently of the power. For example, the grinding gap can be kept constant when the metering capacity is increased by increasing the grinding pressure, or it can also be reduced or enlarged. A corresponding grinding gap control device can consist directly of a pneumatic cylinder or other suitable mechanical or electrical means, which can also be connected to a remote control (such as a computer or process computer), which then specifies a basic value for the respective grinding task, which Depending on the output, the pneumatic control signal adjusts the instantaneous output in the roller mill. It goes without saying that other training courses can also be carried out here or other functions can be carried out, e.g. B. with regard to the limit value, with regard to safety circuits, etc. Particularly advantageously, it can also be controlled as a function of the feed power or by means of the pneumatic control signal. It is also noteworthy that the pneumatic control signal can be used to control both the feed rate and the engagement and disengagement of the grinding rollers.

Claims (6)

1. A system for automatically controlling a milling roll stand having product feed control, product feed being adjusted through the agency of an adjustable dispenser (73), a mechanical detector or sensor (74-77) deflecting an element (77) thereof in dependence upon product feed, the element (77) operating an actuating contact (79) adapted to be pressed into a pneumatic valve (80), the latter contact (79) being pressed in by the detector element (77) as product feed increases, the input of the valve (80) being connected to a compressed air line (81), a servo device (83) being provided to adjust the dispenser (73), characterised in that the outlet of the pneumatic valve (80) is connected by way of a control line (82) to the input of the servo device (83); the pneumatic valve (80) can take up an "off" position, in which the contact (79) is in its extended position, an "on" position, in which the contact (79) is in its fully pressed-in position, in which the contact (79) is in its fully pressed-in position, and a neutral position which is disposed between the "off" and "on" positions and in which the contact (79) is in a middle pressed-in position and the two lines (81, 82) are in the closed state, the contact (79) being biased towards its extended position when pressed in; and when the servo device (83) makes an adjusting movement, the casing of the pneumatic valve (80) moves continuously towards an adjustment of its zero position relatively to the detector element (77).
2. A system according to claim 1, characterised in that a second valve (116) actuated by the control pressure in the control line (82) of the pneumatic valve (80) is provided to control the engagement and disengagement of milling rolls (1, 1 1; 2,21).
3. A system according to claim 1 or 2, characterised in that a lever arm (87) secured pivotally at one end to the frame (89) of the milling roll stand is provided and has secured to it the casing of the pneumatic valve (80) an adjusting element (91) for the dispenser (93), and the piston rod (85; 121) of the servo device (83; 116, 118), the same also being disposed on the last-mentioned frame (89), the casing of the pneumatic valve (80) being disposed at the free end of the lever arm (87); the servo device has a pneumatic cylinder (83; 118) associated with a piston (84; 120) and a piston rod (85; 121); and the piston (84; 120) has its control side acted on by way of the control line (82) with the control pressure of the pneumatic valve (80) and its other side acted on by a biasing force (99, 100).
4. A system according to claim 3, characterised in that members for adjusting the speed of the feed rolls (71, 72) are secured to the lever arm (87).
5. A system according to any of claims 1 to 4, characterised in that the pneumatic valve is a diaphragm valve actuated by a tappet or a cam follower lever having an airvent opening.
6. A system according to claim 3 or 4, characterised in that the piston side remote from the control side of the dispenser-adjusting piston (84; 120) is biased by way of a compression spring (100) towards a closed position of the dispenser (73).
EP81102782A 1980-04-11 1981-04-10 Apparatus for the automatic regulation of a roller mill comprising a product-feed control Expired - Lifetime EP0038054B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81102782T ATE16570T1 (en) 1980-04-11 1981-04-10 DEVICE FOR AUTOMATIC CONTROL OF A MILLING ROLLER WITH A PRODUCT FEED REGULATION.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH2796/80A CH655251A5 (en) 1980-04-11 1980-04-11 MILLING ROLLER CHAIR WITH A PRODUCT FEED CONTROL DEVICE AND METHOD FOR OPERATING THE MILLING ROLLER CHAIR.
CH2796/80 1980-04-11
DE3022564 1980-06-16
DE19803022564 DE3022564A1 (en) 1980-04-11 1980-06-16 METHOD AND DEVICE FOR AUTOMATICALLY CONTROLLING A MILLING ROLLER PROVIDED WITH A PRODUCT FEED CONTROL

Publications (3)

Publication Number Publication Date
EP0038054A1 EP0038054A1 (en) 1981-10-21
EP0038054B1 EP0038054B1 (en) 1985-11-21
EP0038054B2 true EP0038054B2 (en) 1990-01-10

Family

ID=4241774

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Application Number Title Priority Date Filing Date
EP81102782A Expired - Lifetime EP0038054B2 (en) 1980-04-11 1981-04-10 Apparatus for the automatic regulation of a roller mill comprising a product-feed control

Country Status (19)

Country Link
US (1) US4442980A (en)
EP (1) EP0038054B2 (en)
JP (1) JPS6112745B2 (en)
KR (1) KR850000774B1 (en)
AT (1) ATE16570T1 (en)
BR (1) BR8108439A (en)
CH (1) CH655251A5 (en)
CS (1) CS256368B2 (en)
DD (1) DD158209A5 (en)
DE (1) DE3022564A1 (en)
ES (1) ES8207442A1 (en)
HU (1) HU189976B (en)
LT (1) LT2539B (en)
LV (1) LV5593A3 (en)
MX (1) MX156160A (en)
PL (1) PL140702B1 (en)
SU (1) SU1173937A3 (en)
UA (1) UA6000A1 (en)
WO (2) WO1984004469A1 (en)

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WO2019093956A1 (en) * 2017-11-10 2019-05-16 Metso Sweden Ab A deflection distributor refitting kit for a roller crusher, a roller crusher and method for mounting such kit
US11246330B2 (en) * 2018-01-26 2022-02-15 Chris Deakin System and method for flaking
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Also Published As

Publication number Publication date
CS256368B2 (en) 1988-04-15
PL140702B1 (en) 1987-05-30
DE3022564C2 (en) 1987-03-05
LT2539B (en) 1994-02-15
UA6000A1 (en) 1994-12-29
HU189976B (en) 1986-08-28
JPS57500681A (en) 1982-04-22
KR850000774B1 (en) 1985-05-31
MX156160A (en) 1988-07-19
DE3022564A1 (en) 1981-10-15
BR8108439A (en) 1982-03-09
EP0038054B1 (en) 1985-11-21
WO1981002852A1 (en) 1981-10-15
WO1984004469A1 (en) 1984-11-22
JPS6112745B2 (en) 1986-04-09
CH655251A5 (en) 1986-04-15
DD158209A5 (en) 1983-01-05
KR830004885A (en) 1983-07-20
LV5593A3 (en) 1994-05-10
ES501239A0 (en) 1982-09-16
US4442980A (en) 1984-04-17
EP0038054A1 (en) 1981-10-21
SU1173937A3 (en) 1985-08-15
PL230664A1 (en) 1981-12-23
ATE16570T1 (en) 1985-12-15
ES8207442A1 (en) 1982-09-16

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