EP0204266A1 - Tablet-compressing machine - Google Patents

Tablet-compressing machine Download PDF

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Publication number
EP0204266A1
EP0204266A1 EP86107315A EP86107315A EP0204266A1 EP 0204266 A1 EP0204266 A1 EP 0204266A1 EP 86107315 A EP86107315 A EP 86107315A EP 86107315 A EP86107315 A EP 86107315A EP 0204266 A1 EP0204266 A1 EP 0204266A1
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EP
European Patent Office
Prior art keywords
pressure rollers
main pressure
pressing force
main
die plate
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Granted
Application number
EP86107315A
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German (de)
French (fr)
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EP0204266B1 (en
Inventor
Jürgen Hinzpeter
Ingo Schmidt
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Fette GmbH
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Wilhelm Fette GmbH
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    • 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
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B30B11/08—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with moulds carried by a turntable
    • 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

Definitions

  • the invention relates to a rotary tableting machine for compacting powdery or granular pressed material, which has a rotatable die plate and matrices distributed over the circumference, as well as upper and lower punches arranged above and below the die plate, with which the pressed material is turned into tablets by means of adjustable pre-printing is press, in which a main pressure roller is provided with a servomotor controlled by a computer, with which the distance between the main pressure rollers can be changed from one another.
  • Rotary tableting machines of this type are used for the production of compacts from the most varied of materials, that is to say not only for the production of tablets from medicaments which are intended for human consumption are determined, but also of compacts, for example made of plastic or a metal powder or a ceramic mass.
  • the individual tablets are produced by compressing the powdery molding compound in a die of a rotating die between an upper punch and a lower punch.
  • the force for compressing the molding compound at the main printing station is generated in that the upper punch and the lower punch are passed between main pressure rollers, the distance between which can be changed by an actuator in order to be able to specify the size of the main pressing force. (DT-OS 31 31 402).
  • the molding compound is pre-compressed at a pre-printing station using a pre-pressing force before the main printing station.
  • This pre-pressing force is usually considerably less than the main pressing force.
  • the pre-pressing force is 10 kN (Kilo Newton) and the main pressing force is 40 kN.
  • the main pressing forces required to manufacture tablets are so high that they are close to the permissible load limit of the punches lying for pressing. Due to malfunctions such as double fillings, the limit of the permissible load of a main press ram can be exceeded, causing the ram to compress or break. In order to counter this, it is known to provide overpressure safeguards that are preloaded hydraulically or with springs.
  • the object of the present invention is to provide a tabletting machine and a method for controlling its pressure rollers, which reduces the risk of stamp breaks occurring at the main pressing station.
  • a computer controls the servomotor for the distance between the main pressure rollers based on the measured pressing force of the pre-pressure rollers.
  • the pre-pressing force of each punch is thus measured and evaluated at the pre-printing station. Even if this pre-pressing force is considerably lower than the main pressing force at the main pressure station, its size allows a conclusion to be drawn about the size of the main pressing force to be expected. As a result, it can already be recognized from the size of the pre-pressing force whether the pressing force at the main printing station will exceed the permissible punch load.
  • a limit is set for the pre-pressing force when exceeded by the Maximum of the pre-pressing force, the press is stopped suddenly, so that the pre-pressed tablet in question with its associated punches does not reach the main pressure rollers.
  • These are automatically moved apart by a certain size at the same time or after the die plate is shut down, so that the stamps with the excessive pre-pressing force can be passed through in a computer-controlled manner without excessive main pressing force and without the risk of damage between the main pressure rollers which have moved apart.
  • the tabletting machine is then stopped again in order to avoid an ejection of too many bad tablets, which would occur when the main pressure rollers were reset to the originally intended distance. Once this provision has been made, the tablets will continue to be manufactured automatically.
  • the main pressure rollers are preferably mounted in supports whose spacing can be adjusted by the servomotor.
  • the servomotor is coupled in a gear-like manner to a length-adjustable rod which is connected to the carriers of the main pressure rollers, the main pressure rollers being able to be mounted in a parallelogram-type pressure frame.
  • the control of the servomotor for the main pressure rollers and the drive motor for the die plate is preferably carried out using a microprocessor which is connected to strain gauges with which the pre-pressing forces of the pre-pressure rollers can be measured in a known manner.
  • the rotary tablet machine shown in the drawing has a die plate 1 rotating around the arrow 7, which is provided with dies 2, which are arranged evenly distributed over the circumference.
  • the matrices 2 are filled at a filling station 3 with material to be pressed, which is pre-pressed at a pre-printing station 4 using the pre-pressure rollers 11 and 12 (FIG. 2). These pre-pressure rollers 11 and 12 act on the upper punch 9 and lower punch 10 associated with each die for pre-pressing a tablet 8.
  • the final pressing of the material to be pressed 13 takes place at the main printing station 5 using the main pressure rollers 14 and 15.
  • the main pressure rollers 14 and 15 are mounted in a printing frame which, in the exemplary embodiment shown in FIG. 2, consists of two carriers 16 and 17, which are connected by a rod 18.
  • a servomotor M 1 which is provided with a gear.
  • the servomotor M 1 acts on a spindle 22 which is in engagement with a worm wheel 21.
  • This worm wheel 21 sits on a threaded spindle 20 which is seated with its end sections in threaded sleeves 23 and 24.
  • the spindle 22 rotates the worm wheel 21 and thus the spindle 20.
  • the two end sections of the rod 18 are adjusted to one another or away from one another in accordance with the double arrow 19, so that the distance between the main pressure rollers 14 and 15 is also adjusted.
  • the mutual distance between the main pressure rollers 14 and 15 is increased by actuating the servomotor M 1 when a predetermined pre-pressing force limit is exceeded in accordance with the following illustration.
  • the form rollers 11 and 12 are held in a known - and not shown in the drawing - type of a carrier, which is provided with strain gauges with which the deflection of the carrier, which is dependent on the pre-pressing force of the form rollers 11 and 12 and the Stamp 9 and 10, measure and convert to voltage signals which are proportional to the pre-pressure.
  • the strain gauges are based on the principle a full bridge or a Wheatstone bridge, as shown in FIG. 3.
  • the change in voltage that occurs in the stretch marks or bridge 25 during pressing is amplified via an amplifier 26 to a microprocessor 27.
  • the signals are evaluated taking into account the predetermined pressing force limits and when a pre-pressing force limit is exceeded, a signal is sent to the servomotor M 1 for adjusting the main pressure rollers 14 and 15 and to the main drive motor M 2 of the die plate 1 for stopping its circulation.
  • the pre-pressing force V is regularly smaller than the main pressing force H.
  • the main pressing force H must be prevented from exceeding a predetermined pressing force quantity B, since then there is a risk of a stamp break. Therefore the size of the pre-compression force V is taken into account. If the pre-pressing force V is below a predetermined pre-pressing force quantity A, it can be assumed that the subsequent main pressing force H 1 is also below the tolerance limit B. However, if the pre-pressing force V 2 exceeds the predetermined limit A, it must be expected that the subsequent main pressing force H 2 will also exceed the tolerance limit B. In order to prevent this, according to the invention, when the adjustable size A is exceeded by the pre-pressing force V 3, the machine is stopped and the main pressure rollers are moved apart, so that subsequently a main pressing force H 3 to be measured is far below the tolerance limit B.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Medical Preparation Storing Or Oral Administration Devices (AREA)
  • Press Drives And Press Lines (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

Die Rundläufer-Tablettiermaschine zum Verdichten von pulverförmigem oder körnigem Preßgut besitzt eine Matrizenscheibe (1) mit Matrizen (2), die über den Umfang gleichmäßig verteilt angeordnet sind und mit Ober- und Unterstempeln zusammenwirken, mit denen das Preßgut durch Vordruck- und Hauptdruckrollen zu pressen ist. Um die Gefahr von Stempelbrüchen zu vermindern, ist vorgesehen, mindestens eine der beiden Hauptdruckrollen (14, 15) mit einem Stellmotor zu versehen, der die Stellung einer Hauptdruckrolle in Abhängigkeit von der gemessenen Preßkraft der Vordruckrollen (11, 12) steuert. Dafür wird bereits an der Vordruckstation die Vorpreßkraft der Stempel gemessen. Ist eine Grenze für die Vorpreßkraft vorgegeben, so kann bei ihrem Überschreiten die Presse schlagartig stillgesetzt werden. Die Hauptdruckrollen (14, 15) werden dafür in Trägern (16, 17) gelagert, deren Abstand durch ein Stellmotor (M1) verstellbar ist.The rotary tableting machine for compacting powdery or granular pressed material has a die plate (1) with dies (2), which are evenly distributed over the circumference and interact with upper and lower punches with which the pressed material can be pressed by pre-pressure and main pressure rollers is. In order to reduce the risk of stamp breaks, at least one of the two main pressure rollers (14, 15) is provided with a servomotor which controls the position of a main pressure roller as a function of the measured pressing force of the pre-pressure rollers (11, 12). For this purpose, the pre-pressing force of the stamp is measured at the pre-printing station. If a limit is set for the pre-pressing force, the press can be stopped suddenly when it is exceeded. For this purpose, the main pressure rollers (14, 15) are mounted in supports (16, 17), the spacing of which is adjustable by means of a servomotor (M1).

Description

Die Erfindung betrifft eine Rundläufer-Tablettiermaschine zum Verdichten von pulverförmigem oder körnigem Preßgut, die eine drehbare Matrizenscheibe und über den Umfang verteilt angeordnete Matrizen sowie über und unter der Matrizenscheibe angeordnete Ober- und Unterstempel aufweist, mit denen das Preßgut durch einstellbare Vordrucknd Hauptdruckrollen zu Tabletten zu pressen ist, bei der eine Hauptdruckrolle mit einem durch einen Rechner gesteuerten Stellmotor versehen ist, mit dem der Abstand zwischen den Hauptdruckrollen zueinander zu verändern ist.The invention relates to a rotary tableting machine for compacting powdery or granular pressed material, which has a rotatable die plate and matrices distributed over the circumference, as well as upper and lower punches arranged above and below the die plate, with which the pressed material is turned into tablets by means of adjustable pre-printing is press, in which a main pressure roller is provided with a servomotor controlled by a computer, with which the distance between the main pressure rollers can be changed from one another.

Derartige Rundläufer-Tablettiermaschinen werden benutzt zur Herstellung von Preßlingen aus den verschiedenartigsten Materialien, also nicht nur zur Herstellen von Tabletten aus Arzneimitteln, die für den Verbrauch durch den Menschen bestimmt sind, sondern auch von Preßlingen beispielsweise aus Kunststoff oder einem Metallpulver oder einer keramischen Masse. Die Herstellung der einzelnen Tablette erfolgt dadurch, daß die pulverförmige Preßmasse in einer Matrize einer umlaufenden Matrizenscheibe zwischen einem Oberstempel und einem Unterstempel zusammengepreßt wird. Die Kraft zum Komprimieren der Preßmasse an der Hauptdruckstation wird dadurch erzeugt, daß der Oberstempel und der Unterstempel zwischen Hauptdruckrollen hindurchgeführt werden, deren Abstand zueinander durch einen Stellmotor verändert werden kann, um die Größe der Hauptpreßkraft vorgeben zu können. (DT-OS 31 31 402).Rotary tableting machines of this type are used for the production of compacts from the most varied of materials, that is to say not only for the production of tablets from medicaments which are intended for human consumption are determined, but also of compacts, for example made of plastic or a metal powder or a ceramic mass. The individual tablets are produced by compressing the powdery molding compound in a die of a rotating die between an upper punch and a lower punch. The force for compressing the molding compound at the main printing station is generated in that the upper punch and the lower punch are passed between main pressure rollers, the distance between which can be changed by an actuator in order to be able to specify the size of the main pressing force. (DT-OS 31 31 402).

Bei modernen Hochleistungs-Tablettiermaschinen erfolgt bereits vor der Hauptdruckstation eine Vorverdichtung der Preßmasse an einer Vordruckstation unter Anwendung einer Vorpreßkraft. Diese Vorpreßkraft ist in der Regel erheblich geringer als die Hauptpreßkraft. Beispielsweise liegt die Vorpreßkraft bei 10 kN (Kilo Newton) und die Hauptpreßkraft bei 40 kN.In modern high-performance tableting machines, the molding compound is pre-compressed at a pre-printing station using a pre-pressing force before the main printing station. This pre-pressing force is usually considerably less than the main pressing force. For example, the pre-pressing force is 10 kN (Kilo Newton) and the main pressing force is 40 kN.

Vielfach sind zum Herstellen von Tabletten so hohe Hauptpreßkräfte erforderlich, daß sie nahe an der zulässigen Belastungsgrenze der Stempel zum Pressen liegen. Durch Betriebsstörungen wie beispielsweise Doppelfüllungen, kann eine Überschreitung der Grenze der zulässigen Belastung eines Hauptpreßstempels eintreten, so daß eine Stauchung oder ein Bruch des Stempels auftritt. Um dem zu begegnen ist es bekannt, hydraulisch oder mit Federn vorgespannte Überdrucksicherungen vorzusehen. Diese Mittel weisen jedoch den entscheidenden Nachteil auf, daß sie relativ träge sind infolge der großen zu bewegenden Masse, so daß bei schnell laufenden Hochleistungsmaschinen ein ausreichendes Ausweichen der Hauptdruckrollen innerhalb der kurzen zur Verfügung stehenden Zeit nicht möglich ist, denn die Zeit, innerhalb der das Signal der Hauptpreßkraft ansteht und in der folglich auch das Druckrahmensystem ausweichen muß, beträgt bei hohem Tablettenausstoß nur wenige Millisekunden. Das hat zur Folge, daß bei hohen Leistungen der Tablettenmaschinen trotz vorgesehener Überdrucksicherungen ein Stempelbruch nicht auszuschließen ist.In many cases, the main pressing forces required to manufacture tablets are so high that they are close to the permissible load limit of the punches lying for pressing. Due to malfunctions such as double fillings, the limit of the permissible load of a main press ram can be exceeded, causing the ram to compress or break. In order to counter this, it is known to provide overpressure safeguards that are preloaded hydraulically or with springs. However, these agents have the decisive disadvantage that they are relatively sluggish due to the large mass to be moved, so that in high-speed, high-performance machines, it is not possible to sufficiently avoid the main pressure rollers within the short time available, because the time within which Signal of the main pressing force is present and in which consequently the pressure frame system has to dodge, is only a few milliseconds with high tablet output. The consequence of this is that, in the case of high performance of the tablet machines, a breakage of the stamp cannot be ruled out despite the provided overpressure protection.

Aufgabe der vorliegenden Erfindung ist es, eine Tablettiermaschine und ein Verfahren zur Steuerung seiner Druckrollen zu schaffen, welche die Gefahr des Auftretens von Stempelbrüchen an der Hauptpreßstation vermindert. Gemäß der Erfindung ist dafür vorgesehen, daß ein Rechner den Stellmotor für den Abstand der Hauptdruckrollen aufgrund der gemessenen Preßkraft der Vordruckrollen steuert. Nach der Erfindung wird somit bereits an der Vordruckstation die Vorpreßkraft jedes Stempels gemessen und ausgewertet. Wenn diese Vorpreßkraft auch erheblich niedriger ist als die Hauptpreßkraft an der Hauptdruckstation, so läßt ihre Größe doch einen Rückschluß auf die Größe der zu erwartenden Hauptpreßkraft zu. Demzufolge kann bereits anhand der Größe der Vorpreßkraft erkannt werden, ob die Preßkraft an der Hauptdruckstation die zulässige Stempelbelastung überschreiten wird. Nach der Erfindung wird deshalb eine Grenze für die Vorpreßkraft vorgegeben, bei deren Überschreiten durch das Maximum der Vorpreßkraft die Presse schlagartig gestoppt wird, so daß die betreffende vorgepreßte Tablette mit ihren zugehörigen Stempeln nicht die Hauptdruckrollen erreicht. Diese werden gleichzeitig oder nach der Stillsetzung der Matrizenscheibe automatisch um eine bestimmte Größe auseinandergefahren, so daß die Stempel mit der zu hohen Vorpreßkraft ohne überhöhte Hauptpreßkraft und ohne die Gefahr einer Beschädigung zwischen den Auseinandergefahrenen Hauptdruckrollen rechnergesteuert hindurchzufahren sind. Danach wird die Tablettiermaschine erneut gestoppt, um einen Ausstoß von zu vielen Schlechttabletten zu vermeiden, der eintreten würde in der Zeit der Rückstellung der Hauptdruckrollen auf den ursprünglich vorgesehenen Abstand. Ist diese Rückstellung er - folgt, so wird die Fertigung der Tabletten selbsttätig fortgesetzt.The object of the present invention is to provide a tabletting machine and a method for controlling its pressure rollers, which reduces the risk of stamp breaks occurring at the main pressing station. According to the invention provided that a computer controls the servomotor for the distance between the main pressure rollers based on the measured pressing force of the pre-pressure rollers. According to the invention, the pre-pressing force of each punch is thus measured and evaluated at the pre-printing station. Even if this pre-pressing force is considerably lower than the main pressing force at the main pressure station, its size allows a conclusion to be drawn about the size of the main pressing force to be expected. As a result, it can already be recognized from the size of the pre-pressing force whether the pressing force at the main printing station will exceed the permissible punch load. According to the invention, therefore, a limit is set for the pre-pressing force when exceeded by the Maximum of the pre-pressing force, the press is stopped suddenly, so that the pre-pressed tablet in question with its associated punches does not reach the main pressure rollers. These are automatically moved apart by a certain size at the same time or after the die plate is shut down, so that the stamps with the excessive pre-pressing force can be passed through in a computer-controlled manner without excessive main pressing force and without the risk of damage between the main pressure rollers which have moved apart. The tabletting machine is then stopped again in order to avoid an ejection of too many bad tablets, which would occur when the main pressure rollers were reset to the originally intended distance. Once this provision has been made, the tablets will continue to be manufactured automatically.

Die Hauptdruckrollen sind dafür vorzugsweise in Trägern gelagert, deren Abstand durch den Stellmotor verstellbar ist. Dafür ist der Stellmotor getriebeartig mit einem längenverstellbaren Stab gekoppelt, der mit den Trägern der Hauptdruckrollen verbunden ist, wobei die Hauptdruckrollen in einem parallelogrammartigen Druckrahmen gelagert sein können.For this purpose, the main pressure rollers are preferably mounted in supports whose spacing can be adjusted by the servomotor. For this purpose, the servomotor is coupled in a gear-like manner to a length-adjustable rod which is connected to the carriers of the main pressure rollers, the main pressure rollers being able to be mounted in a parallelogram-type pressure frame.

Die Steuerung des Stellmotors für die Hauptdruckrollen sowie des Antriebsmotors für die Matrizenscheibe erfolgt vorzugsweise unter Anwendung eines Mikroprozessors, der an Dehnungsmeßstreifen angeschlossen ist, mit denen sich die Vorpreßkräfte der Vordruckrollen in bekannter Weise messen lassen.The control of the servomotor for the main pressure rollers and the drive motor for the die plate is preferably carried out using a microprocessor which is connected to strain gauges with which the pre-pressing forces of the pre-pressure rollers can be measured in a known manner.

Ein Ausführungsbeispiel der Erfindung ist nachstehend unter Bezugnahme auf eine Zeichnung erläutert. In der Zeichnung zeigen:

  • Figur 1: die Draufsicht auf eine Rundläufer-Tablettiermaschine in schematischer Darstellung
  • Figur 2: eine Abwicklung mit der Vor- und Hauptpreßstation, teilweise in vergrößerter Darstellung
  • Figur 3: die Schaltung für die Steuerung der Motore
  • Figur 4: die Preßkräfte im Diagramm
An embodiment of the invention is explained below with reference to a drawing. The drawing shows:
  • Figure 1: The plan view of a rotary tablet machine in a schematic representation
  • Figure 2: a processing with the pre and main press station, partially in an enlarged view
  • Figure 3: the circuit for the control of the motors
  • Figure 4: the pressing forces in the diagram

Die in der Zeichnung wiedergegebene Rundläufer-Tablettiermaschine besitzt eine entsprechend dem Pfeil 7 umlaufende Matrizenscheibe 1, die mit Matrizen 2 versehen ist, welche gleichmäßig über den Umfang verteilt angeordnet sind.The rotary tablet machine shown in the drawing has a die plate 1 rotating around the arrow 7, which is provided with dies 2, which are arranged evenly distributed over the circumference.

Für die Herstellung von Tabletten werden die Matrizen 2 an einer Füllstation 3 mit Preßgut gefüllt, das an einer Vordruckstation 4 unter Anwendung der Vordruckrollen 11 und 12 (Figur 2) vorgepreßt wird. Diese Vordruckrollen 11 und 12 wirken auf den zu jeder Matrize gehörigen Oberstempel 9 und Unterstempel 10 zum Vorpressen einer Tablette 8 ein.For the production of tablets, the matrices 2 are filled at a filling station 3 with material to be pressed, which is pre-pressed at a pre-printing station 4 using the pre-pressure rollers 11 and 12 (FIG. 2). These pre-pressure rollers 11 and 12 act on the upper punch 9 and lower punch 10 associated with each die for pre-pressing a tablet 8.

Nach dem Vorpressen an der Vordruckstation 4 erfolgt das endgültige Zusammenpressen des Preßgutes 13 an der Hauptdruckstation 5 unter Anwendung der Hauptdruckrollen 14 und 15. Die Hauptdruckrollen 14 und 15 sind in einem Druckrahmen gelagert, der in dem in Figur 2 wiedergegebenen Ausführungsbeispiel aus zwei Trägern 16 und 17 besteht, die durch einen Stab 18 miteinander verbunden sind. Selbstverständlich besteht die Möglichkeit, davon abweichend die Druckrollen 14 und 15 andersartig zu lagern. Von Bedeutung ist jedoch, daß ihr gegenseitiger Abstand verstellbar ist durch einen Stellmotor M1, der mit einem Getriebe versehen ist.After the pre-pressing at the pre-printing station 4, the final pressing of the material to be pressed 13 takes place at the main printing station 5 using the main pressure rollers 14 and 15. The main pressure rollers 14 and 15 are mounted in a printing frame which, in the exemplary embodiment shown in FIG. 2, consists of two carriers 16 and 17, which are connected by a rod 18. Of course, there is the possibility of storing the pressure rollers 14 and 15 differently. It is important, however, that their mutual distance is adjustable by means of a servomotor M 1 , which is provided with a gear.

Der Stellmotor M1 wirkt auf eine Spindel 22, die mit einem Schneckenrad 21 im Eingriff steht. Dieses Schneckenrad 21 sitzt auf einer Gewindespindel 20, die mit ihren Endabschnitten in Gewindehülsen 23 und 24 sitzt.The servomotor M 1 acts on a spindle 22 which is in engagement with a worm wheel 21. This worm wheel 21 sits on a threaded spindle 20 which is seated with its end sections in threaded sleeves 23 and 24.

Bei einem Umlauf der Spindel 22 rotiert das Schneckenrad 21 und damit die Spindel 20. Je nach der Drehrichtung der Spindel 20 werden die beiden Endabschnitte des Stabes 18 entsprechend dem Doppelpfeil 19 zueinander oder voneinander fort verstellt, so daß damit auch der Abstand der Hauptdruckrollen 14 und 15 verstellt wird. Eine Vergrößerung des gegenseitigen Abstandes der Hauptdruckrollen 14 und 15 durch Betätigung des Stellmotors M1 erfolgt bei überschreiten einer vorgegebenen Vorpreßkraftgrenze entsprechend der nachfolgenden Darstellung.When the spindle 22 rotates the worm wheel 21 and thus the spindle 20. Depending on the direction of rotation of the spindle 20, the two end sections of the rod 18 are adjusted to one another or away from one another in accordance with the double arrow 19, so that the distance between the main pressure rollers 14 and 15 is also adjusted. The mutual distance between the main pressure rollers 14 and 15 is increased by actuating the servomotor M 1 when a predetermined pre-pressing force limit is exceeded in accordance with the following illustration.

Die Vordruckrollen 11 und 12 sind in bekannter - und in der Zeichnung nicht wiedergegebener - Art von einem Träger gehalten, der mit Dehnungsmeßstreifen versehen ist, mit denen sich die Durchbiegung des Trägers, die abhängig ist von der Vorpreßkraft der Vordruckrollen 11 und 12 bzw. der Stempel 9 und 10, messen und in läßt/ Spannungssignale umwandeln, die dem Vorpreßdruck proportional sind. Die Dehnungsmeßstreifen sind dafür nach dem Prinzip einer Vollbrücke bzw. einer Wheatstoneschen Brücke geschaltet entsprechend der Darstellung in Figur 3. Die Spannungsänderung, die in den Dehnungsstreifen bzw. der Brücke 25 beim Pressen auftritt, wird über einen Verstärker 26 verstärkt auf einen Mikroprozessor 27 gegeben. In diesem Mikroprozessor 27 erfolgt eine Auswertung der Signale unter Berücksichtigung der vorgegebenen Preßkraftgrenzen und bei Überschreitung einer Vorpreßkraftgrenze eine Signalgebung auf den Stellmotor M1 für eine Verstellung der Hauptdruckrollen 14 und 15 sowie auf den Hauptantriebsmotor M2 der Matrizenscheibe 1 für eine Stillsetzung ihres Umlaufes.The form rollers 11 and 12 are held in a known - and not shown in the drawing - type of a carrier, which is provided with strain gauges with which the deflection of the carrier, which is dependent on the pre-pressing force of the form rollers 11 and 12 and the Stamp 9 and 10, measure and convert to voltage signals which are proportional to the pre-pressure. The strain gauges are based on the principle a full bridge or a Wheatstone bridge, as shown in FIG. 3. The change in voltage that occurs in the stretch marks or bridge 25 during pressing is amplified via an amplifier 26 to a microprocessor 27. In this microprocessor 27, the signals are evaluated taking into account the predetermined pressing force limits and when a pre-pressing force limit is exceeded, a signal is sent to the servomotor M 1 for adjusting the main pressure rollers 14 and 15 and to the main drive motor M 2 of the die plate 1 for stopping its circulation.

Entsprechend der Figur 4, in der die Größe F der Preßkräfte über der Zeit bei drei verschiedenen Betriebszuständen aufgezeigt ist, ist die Vorpreßkraft V regelmäßig kleiner als die Hauptpreßkraft H. Beim Betrieb ist zu verhindern, daß die Hauptpreßkraft H eine vorgegebene Preßkraftgröße B überschreitet, da dann die Gefahr eines Stempelbruches gegeben ist. Dafür wird die Größe der Vorpreßkraft V berücksichtigt. Liegt die Vorpreßkraft V unterhalb einer vorgegebenen Vorpreßkraftgröße A, so kann davon ausgegangen werden, daß die nachfolgende Hauptpreßkraft H1 ebenfalls unterhalb der Toleranzgrenze B liegt. Überschreitet die Vorpreßkraft V2 hingegen die vorgegebene Grenze A, so muß damit gerechnet werden, daß die nachfolgende Hauptpreßkraft H2 ebenfalls die Toleranzgrenze B überschreitet. Um das zu verhindert, wird erfindungsgemäß bei einem Überschreiten der einstellbaren Größe A durch die Vorpreßkraft V3 die Maschine stillgesetzt und die Hauptdruckrollen auseinandergefahren, so daß nachfolgend eine zu messende Hauptpreßkraft H3 weit unterhalb der Toleranzgrenze B liegt.According to FIG. 4, in which the size F of the pressing forces is shown over time in three different operating states, the pre-pressing force V is regularly smaller than the main pressing force H. During operation, the main pressing force H must be prevented from exceeding a predetermined pressing force quantity B, since then there is a risk of a stamp break. Therefore the size of the pre-compression force V is taken into account. If the pre-pressing force V is below a predetermined pre-pressing force quantity A, it can be assumed that the subsequent main pressing force H 1 is also below the tolerance limit B. However, if the pre-pressing force V 2 exceeds the predetermined limit A, it must be expected that the subsequent main pressing force H 2 will also exceed the tolerance limit B. In order to prevent this, according to the invention, when the adjustable size A is exceeded by the pre-pressing force V 3, the machine is stopped and the main pressure rollers are moved apart, so that subsequently a main pressing force H 3 to be measured is far below the tolerance limit B.

Claims (5)

1. Rundläufer-Tablettiermaschine zum Verdichten von pulverförmigem oder körnigem Preßgut, die eine drehbare Matrizenscheibe mit über den Umfang verteilt angeordneten Matrizen sowie über und unter der Matrizenscheibe angeordnete Ober- und Unterstempel aufweist, mit denen das Preßgut durch einstellbare Vordruck-und Hauptdruckrollen zu Tabletten zu pressen ist, wobei eine Hauptdruckrolle mit einem durch einen Rechner gesteuerten Stellmotor versehen ist, mit dem der Abstand zwischen den Hauptdruckrollen zueinander zu verändern ist, dadurch gekennzeichnet, daß ein Rechner (27) den Stellmotor (M1) für den Abstand der Hauptdruckrollen (14, 15) in Abhängigkeit von der gemessenen Preßkraft der Vordruckrollen (11, 12) steuert.1. Rotary tableting machine for compacting powdery or granular pressed material, which has a rotatable die plate with matrices distributed over the circumference and upper and lower punches arranged above and below the die plate, with which the pressed material is turned into tablets by means of adjustable pre-pressure and main pressure rollers Pressing, a main pressure roller being provided with a servomotor controlled by a computer, by means of which the distance between the main pressure rollers can be changed, characterized in that a computer (27) controls the servomotor (M 1 ) for the spacing of the main pressure rollers (14 , 15) as a function of the measured pressing force of the pre-pressure rollers (11, 12). 2. Tablettiermaschine nach Anspruch 1, dadurch gekennzeichnet, daß ein Meßwertgeber (25), der an den Trägern der Vordruckrollen (11, 12) angebracht ist, über den Rechner (27) mit dem Stellmotor (M1) der Hauptdruckrollen (14, 15) verbunden ist.2. tableting machine according to claim 1, characterized in that a transducer (25), which is attached to the carriers of the form pressure rollers (11, 12), is connected via the computer (27) to the servomotor (M 1 ) of the main pressure rollers (14, 15). 3. Verfahren zur Steuerung der Hauptdruckrollen einer Rundläufer-Tablettiermaschine, bei der das Preßgut in Matrizen einer Matrizenscheibe vorgepreßt wird, dadurch gekennzeichnet, daß bei Überschreiten einer vorgegebenen Vorpreßkraft einer Tablette (8) der Umlauf der Matrizenscheibe (1) der Tablettiermaschine unterbrochen wird und der Abstand der Hauptdruckrollen (14, 15) vor dem Durchlauf der vorgepreßten Tablette (8) vergrößert und nach dem Durchlauf der Tablette (8) verringert wird.3. A method for controlling the main pressure rollers of a rotary tableting machine, in which the material to be pressed is pressed into matrices of a die plate, characterized in that the circulation of the die plate (1) of the tableting machine is interrupted when a predetermined pre-pressing force of a tablet (8) is exceeded and the Distance between the main pressure rollers (14, 15) before the passage of the pre-compressed tablet (8) is increased and after the passage of the tablet (8) is reduced. 4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß der Umlauf der Matrizenscheibe (1) nach dem Durchlauf durch die Vordruckrollen (11, 12) bei zu hoch vorgepreßter Tablette (8) vor den Hauptdruckrollen (14, 15) unterbrochen wird.4. The method according to claim 3, characterized in that the circulation of the die plate (1) is interrupted after passing through the pre-pressure rollers (11, 12) when the tablet (8) is pressed too high in front of the main pressure rollers (14, 15). 5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß bei Überschreiten einer vorgegebenen Vorpreßkraft über einen Rechner (27) der Antriebsmotor (M2) der Matrizenscheibe (1) und der Stellmotor (M1) für die Verstellung der Hauptdruckrollen (14, 15) angesteuert werden.5. The method according to claim 4, characterized in that when a predetermined one is exceeded Prepressing force can be controlled via a computer (27), the drive motor (M 2 ) of the die plate (1) and the servomotor (M 1 ) for the adjustment of the main pressure rollers (14, 15).
EP86107315A 1985-06-05 1986-05-30 Tablet-compressing machine Expired EP0204266B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853520203 DE3520203A1 (en) 1985-06-05 1985-06-05 ROTARY ROTARY TABLETING MACHINE AND METHOD FOR CONTROLLING YOUR PRINT ROLLERS
DE3520203 1985-06-05

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EP0204266A1 true EP0204266A1 (en) 1986-12-10
EP0204266B1 EP0204266B1 (en) 1988-10-12

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EP (1) EP0204266B1 (en)
DE (2) DE3520203A1 (en)

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WO1995028268A1 (en) * 1994-04-19 1995-10-26 H-C Industries, Inc. Method of detecting cam overload in a plastic molding apparatus
US5838571A (en) * 1996-01-29 1998-11-17 Alza Corporation Tablet press monitoring and controlling method and apparatus
DE19955196A1 (en) * 1999-11-16 2001-05-23 Korsch Pressen Ag Method to maintain breaking resistance of e.g. washing powder tablets etc. with constant automatic adaptation of dosing resp. compacting rollers to compensate for charging variations
DE19828004B4 (en) * 1998-06-24 2005-10-13 Korsch Ag Method for achieving a constant pressing force in tableting machines
CN110920128A (en) * 2019-12-16 2020-03-27 湖北工业大学 High-speed powder tablet press

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US5211964A (en) * 1991-05-20 1993-05-18 Westinghouse Electric Corp. Press machine with means to adjust punching force
JPH0780076B2 (en) * 1992-04-28 1995-08-30 株式会社菊水製作所 Attachment load cell inspection method of rotary tablet machine
FI92145C (en) * 1993-01-28 1994-10-10 Tensor Oy Method and apparatus for simulating tablet pressing
US5401156A (en) * 1993-12-08 1995-03-28 Carruthers Equipment Co. Machine for inserting a sized portion of a food product into a container
DE19502596C2 (en) * 1995-01-28 1997-08-28 Fette Wilhelm Gmbh Measuring device and computer for checking the tablets of the current production made on a rotary press
US6106262A (en) 1997-12-25 2000-08-22 Metropolitan Computing Corporation Press simulation apparatus
DE10135283C2 (en) * 2001-07-19 2003-09-18 Fette Wilhelm Gmbh Process for pressing powder material
US20050200038A1 (en) 2004-03-12 2005-09-15 Courtoy Nv Method for controlling a rotary tablet press and such a press
DE102005007790B4 (en) * 2005-02-19 2007-06-28 Fette Gmbh Method and device for the test extrusion of multilayer tablets or coated tablets
WO2008016183A1 (en) * 2006-08-04 2008-02-07 Brother Kogyo Kabushiki Kaisha Image forming apparatus
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WO1995028268A1 (en) * 1994-04-19 1995-10-26 H-C Industries, Inc. Method of detecting cam overload in a plastic molding apparatus
US5838571A (en) * 1996-01-29 1998-11-17 Alza Corporation Tablet press monitoring and controlling method and apparatus
DE19828004B4 (en) * 1998-06-24 2005-10-13 Korsch Ag Method for achieving a constant pressing force in tableting machines
DE19955196A1 (en) * 1999-11-16 2001-05-23 Korsch Pressen Ag Method to maintain breaking resistance of e.g. washing powder tablets etc. with constant automatic adaptation of dosing resp. compacting rollers to compensate for charging variations
CN110920128A (en) * 2019-12-16 2020-03-27 湖北工业大学 High-speed powder tablet press
CN110920128B (en) * 2019-12-16 2021-08-24 湖北工业大学 High-speed powder tablet press

Also Published As

Publication number Publication date
US4680158A (en) 1987-07-14
EP0204266B1 (en) 1988-10-12
DE3520203A1 (en) 1986-12-11
DE3660887D1 (en) 1988-11-17

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