EP1666237B1 - Rotary press - Google Patents

Rotary press Download PDF

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Publication number
EP1666237B1
EP1666237B1 EP05021998A EP05021998A EP1666237B1 EP 1666237 B1 EP1666237 B1 EP 1666237B1 EP 05021998 A EP05021998 A EP 05021998A EP 05021998 A EP05021998 A EP 05021998A EP 1666237 B1 EP1666237 B1 EP 1666237B1
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EP
European Patent Office
Prior art keywords
punches
rotor
rotary press
die
pressing surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
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EP05021998A
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German (de)
French (fr)
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EP1666237A2 (en
EP1666237A3 (en
Inventor
Jürgen Schikowski
Ingo Schmidt
Thorsten Ehrich
Helmut Bommrowitz
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Fette GmbH
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Fette GmbH
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Publication of EP1666237A2 publication Critical patent/EP1666237A2/en
Publication of EP1666237A3 publication Critical patent/EP1666237A3/en
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Publication of EP1666237B1 publication Critical patent/EP1666237B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/34—Heating or cooling presses or parts thereof
    • 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
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0005—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for briquetting presses
    • B30B15/0011—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for briquetting presses lubricating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0082—Dust eliminating means; Mould or press ram cleaning means

Definitions

  • the known rotary press uses two spaced press stations with upper and lower pressure roller and between the pressing stations a guide is provided which ensures that the upper punch perform no return stroke between the pressure rollers and thus maintain the pressing pressure. From this document is also known to cause a rotation about the longitudinal axis during the movement of the upper punches between the pressing stations.
  • punches for pressing tablets have become known, which have an insert which engages with the material to be pressed.
  • the insert has a compressible, compliant material intended to more easily separate the ram from the material to be pressed.
  • Out JP-A-06040729 It has become known to clean a template with the aid of a mixture of CeO 2 and water in order to remove adhering material.
  • Out JP-A-01321100 It has become known to remove adhering to the pressing surfaces of press punches of a rotary press material in that the stamp are driven abruptly against each other.
  • the invention has for its object to provide a rotary press, in which an adhesion of the compact or material of the compact is not possible even with non-round cross-sectional shapes of the matrices.
  • the pressing surface is approximately equal to the outer diameter of the die. This ensures that at a certain height offset between Matrizenplattenoberkante and top of the die Upper punch does not touch the upper edge of the die.
  • the outer edge of the upper punch may be non-circular or polygonal, and the cross-section of the die bore is carried out accordingly.
  • the upper punch should be sized so that the die bore is completely covered.
  • Another alternative possibility for releasing an adhering compact or parts thereof according to one embodiment of the invention is that a device for heating or cooling of the upper punches is provided. Cooling ensures that adherence is prevented from the outset. Above all else, warming can lead to detaching adhering material.
  • the Heating or cooling can take place, for example, with the aid of a gas, for example with cold nitrogen.
  • a device for cooling the pressing material can be assigned to the rotor itself.
  • a cleaning device is provided for cleaning the pressing surfaces of the upper punch after the pressing operation.
  • the cleaning device may e.g. Have stripping means with which the pressing surface of the upper punch is cleaned. Additionally or alternatively, an ultrasonic cleaning device may be provided.
  • the single figure shows schematically a section through a rotor with upper and lower punch in a pressing station.
  • a rotor 10 of a rotary press is rotatably mounted about a vertical axis by means of a drive, not shown.
  • the storage and other parts of the rotary press are not shown, as is well known.
  • the rotor 10 has a die plate 12, which is provided in a predetermined pitch with a series of matrices 14 which are embedded in corresponding holes of the die plate 12.
  • the dies 14 serve to receive a material to be pressed, as shown at 16.
  • the cross section of the Matrizenbohronne be square, for example for pressing material for bouillon cubes.
  • upper and lower punches are arranged vertically displaceable.
  • an upper punch 20 and a lower punch 22 are shown for explanatory purposes. It is understood that corresponding to the number of matrices 14 a corresponding number of upper and lower punches is provided with a corresponding division.
  • the lower punch 22 projects with its pressing surface a predetermined amount into the bore of the die 14.
  • the upper and lower punches are guided by means of guides not shown in their relative position to the die plate 12.
  • Approaches a pair of dies 20, 22 of a pressing station in which an upper pressure roller 24 and a lower pressure roller 26 are arranged, the stamp are guided with their respective pressing surfaces in a predetermined manner.
  • the lower punch 22 is already within the die 14, while the upper punch 20 is located outside of the die, during filling and also after, the upper punch 20 is then gradually adjusted in the direction Matrizenintensive 12.
  • Below or above the pressure rollers 24, 26, the punches 20, 22 are adjusted by a predetermined distance to accomplish a pressing operation.
  • the upper punch 20 is formed in three parts, namely with a shaft 28 having an engagement surface for the pressure roller 24 at the upper end, an insert 30 which is replaceably formed on the shaft 20 and a plastic portion 32 on the insert 30, the example is glued to the insert 30.
  • a connection between the parts by means of screws.
  • the diameter of the Plastic section 32 and its edge length corresponding to the edge length of rectangular in cross-section or square Matrizenbuchse. This is dimensioned so that it is flush with the facing side of the die plate 12.
  • the plastic portion 32 which is preferably planar, rests on the die 14 when the upper punch 20 reaches its maximum lowermost position.
  • the plastic portion 32 is formed from a dimensionally stable, preferably non-adhesive plastic material.
  • the rotatably mounted upper punch 20 is rotated. This is indicated by dashed lines at 34.
  • the rotation is indicated by the arrow 36 and the return stroke by the arrow 38. It is understood that in the actual embodiment, the die 14 is aligned vertically to the upper punch 34 when the return stroke begins.
  • the described rotation of the upper punch 34 may be performed in any known manner. Thus, the rotation can be done, for example, in the manner as in EP 0 448 190 B1 is described or, which is preferably applied, in the manner as in DE 100 24 340 C2 disclosed. This eliminates complex precautions in the rotary press, since the rotation mechanism is realized within the stamp.
  • the rotation of the upper punches 20 causes possibly adhering to the pressing surface material is released and the return stroke of the upper punch 20 does not cause the compact or parts thereof to adhere to the pressing surface.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Press Drives And Press Lines (AREA)
  • Forging (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

Rotary press comprises a rotor rotatably driven about a vertical axis. The rotor exhibits a die plate and upper and lower punches, and press station(s). It has compact-acting mechanism, which act upon compacts or parts of compact, which adhere to the pressing surface or which eliminates or prevents an adherence of a compact or parts of compact to the pressing surface of the upper punch, respectively, during the return stroke. Rotary press comprises a rotor rotatably driven about a vertical axis. The rotor exhibits a die plate and upper and lower punches, which are vertically guided in guides of the rotor working together with die holes in a die plate; and press station(s), which exhibits upper and lower pressures passed by the punches and through which the punches are moved towards the die hole to compress the material in the die hole. It has compact-acting mechanism, which act upon compacts or parts of compact, which adhere to the pressing surface or which eliminates or prevents an adherence of a compact or parts of compact to the pressing surface of the upper punch, respectively, during the return stroke.

Description

Die Erfindung bezieht sich auf eine Rundlaufpresse nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a rotary press according to the preamble of patent claim 1.

Es ist bekannt, zur Herstellung von Tabletten und ähnlichen Preßlingen Rundlaufpressen zu verwenden. Diese weist einen um eine vertikale Achse drehbar gelagerten und angetriebenen Rotor auf, wobei der Rotor eine Matrizenscheibe und Stempelführungen für Ober- und Unterstempel aufweist. Diese Ober- und Unterstempel werden von geeigneten Kurven geführt, und in mindestens einer Preßstation sind eine obere und eine untere Preßrolle oder Druckrolle angeordnet, mit deren Hilfe die Preßstempel das in den Matrizen befindliche zu komprimierende Material verpreßt wird. Eine derartige Rundlaufpresse, gemäß dem Oberbegriff des Anspruchs 1, ist aus DE-A-198 55 328 A1 bekannt geworden. Die bekannte Rundlaufpresse verwendet zwei beabstandete Preßstationen mit oberer und unterer Druckrolle und zwischen den Preßstationen ist eine Führung vorgesehen, welche dafür sorgt, daß die Oberstempel keinen Rückhub zwischen dem Druckrollen ausführen und somit dem Preßdruck aufrecht erhalten. Aus dieser Schrift ist auch bekannt, während der Bewegung der Oberstempel zwischen den Preßstationen eine Drehung um die Längsachse herbeizuführen.It is known to use for the production of tablets and similar compacts rotary presses. This has a rotatably mounted about a vertical axis and driven rotor, wherein the rotor has a die plate and punch guides for upper and lower punch. These upper and lower punches are guided by suitable curves, and in at least one pressing station, an upper and a lower pressure roller or pressure roller are arranged, with the aid of which the pressing die is pressed into the matrices located to be compressed material. Such a rotary press, according to the preamble of claim 1, is made DE-A-198 55 328 A1 become known. The known rotary press uses two spaced press stations with upper and lower pressure roller and between the pressing stations a guide is provided which ensures that the upper punch perform no return stroke between the pressure rollers and thus maintain the pressing pressure. From this document is also known to cause a rotation about the longitudinal axis during the movement of the upper punches between the pressing stations.

Aus WO-A-9958320 sind Stempel zum Pressen von Tabletten bekannt geworden, welche einen Einsatz aufweisen, der mit dem zu verpressenden Material in Eingriff kommt. Der Einsatz weist ein kompressibles, nachgebendes Material auf, das dazu dienen soll, den Preßstempel leichter vom zu pressenden Gut zu trennen.Out WO-A-9958320 For example, punches for pressing tablets have become known, which have an insert which engages with the material to be pressed. The insert has a compressible, compliant material intended to more easily separate the ram from the material to be pressed.

Aus EP-A-1043009 A1 ist für eine Rundlaufpresse bekannt geworden, die Preßflächen von Ober- und Unterstempel mit Preßluft zu reinigen. Aus dieser Schrift ist auch bekannt geworden, mit Hilfe eines Abstreifers die Preßflächen zu reinigen, wenn sie in einem auseinandergefahrenen Zustand sind. Aus GB-A-2035195 ist bekannt geworden, die Preßstempel einer Rundlaufpresse zu temperieren, beispielsweise zu beheizen. Aus US-A-6,277,407 B1 ist bekannt geworden, mit Hilfe einer Art Bürste die Preßflächen von Preßstempeln einer Rundlaufpresse zu reinigen, wenn die Preßstempel auseinandergefahren sind.Out EP-A-1043009 A1 has become known for a rotary press to clean the pressing surfaces of upper and lower punches with compressed air. From this document has also become known to clean the pressing surfaces with the aid of a scraper when they are in a disassembled state. Out GB-A-2035195 it has become known to temper the press ram of a rotary press, for example, to heat. Out US-A-6,277,407 B1 has become known, with the help of a kind of brush to clean the pressing surfaces of press punches of a rotary press, when the ram are moved apart.

Aus JP-A-2002103096 ist bekannt geworden, in der Matrizenbohrung anhaftendes Pulver in einer Rundlaufpresse zu reinigen, wenn die Preßstempel auseinandergefahren sind.Out JP-A-2002103096 It has become known to clean in the die bore adhering powder in a rotary press when the ram are moved apart.

Aus JP-A-06040729 ist bekannt geworden, eine Matrize mit Hilfe einer Mischung aus CeO2 und Wasser zu reinigen, um anhaftendes Material zu entfernen. Aus JP-A-01321100 ist bekannt geworden, an den Preßflächen von Preßstempeln einer Rundlaufpresse anhaftendes Material dadurch zu entfernen, daß die Stempel schlagartig gegeneinander gefahren werden.Out JP-A-06040729 It has become known to clean a template with the aid of a mixture of CeO 2 and water in order to remove adhering material. Out JP-A-01321100 It has become known to remove adhering to the pressing surfaces of press punches of a rotary press material in that the stamp are driven abruptly against each other.

Manche zu verpressenden Materialien neigen dazu, nach dem Preßvorgang an der Preßfläche der Oberstempel anzuhaften, wenn der Oberstempel seinen Rückhub beginnt. Dieser Effekt führt dazu, daß die Oberfläche des Preßlings nicht die gewünschte Qualität erhält und zudem den nächsten Preßvorgang ungünstig beeinflußt. Aus EP 0 448 190 B1 oder DE 88 16 064 U1 ist bekannt geworden, die Stempel drehbar in den Stempelführungen zu lagern und während des Rückhubs nach einem Preßvorgang in Drehung zu versetzen. Mit Hilfe der Drehung der Stempel wird der Anhafteffekt weitgehend unterbunden. Aus DE 100 24 340 C2 ist auch bekannt, einen Stempeleinsatz drehbar im Stempelschaft zu lagern, wobei der Einsatz einen Ansatz aufweist, der zwischen zwei axial beabstandeten Anschlägen schraubenlinienförmig geführt wird. Eine Feder spannt den Einsatz vom Stempelschaft fort nach unten.Some materials to be pressed tend to adhere to the pressing surface of the upper punches after the pressing operation when the upper punch starts its return stroke. This effect causes the surface of the compact does not get the desired quality and also affects the next pressing unfavorable. Out EP 0 448 190 B1 or DE 88 16 064 U1 It has become known to support the stamp rotatably in the punch guides and to set during the return stroke after a pressing operation in rotation. With the help of the rotation of the stamp the adhesion effect is largely prevented. Out DE 100 24 340 C2 It is also known to rotatably support a punch insert in the punch shaft, the insert having a lug which is helically guided between two axially spaced stops. A spring tensions the insert away from the punch shaft.

Während des Rückhubs der Oberstempel findet eine Entlastung statt, bei der sich der Oberstempel normalerweise innerhalb der Matrize befindet. Ist der Preßling unrund, beispielsweise quadratisch, kommt eine Drehung der Preßstempel bzw. der Einsätze nicht in Betracht.During the return stroke of the upper punches a relief takes place, with the upper punch normally located within the die. If the compact is non-circular, for example, square, a rotation of the ram or the inserts is out of the question.

Aus der nicht vorveröffentlichten EP 1 600 285 Alist eine Rundlaufpresse bekannt geworden, bei der die Pressfläche der Oberstempel größer ist als die Querschnittsfläche der Matrizenbohrungen. In der unteren Druckpunktlage liegen die Oberstempel auf den Matrizen auf. Die Oberstempel werden von den Druckrollen in Drehung versetzt, indem die Druckrollen im Abstand zur Längsachse der Oberstempel mit planen Endflächen der Oberstempel in Eingriff treten. Durch den exzentrischen Kontakt mit der Druckrolle werden die Oberstempel um ihre Längsachse gedreht.From the not pre-published EP 1 600 285 Alist a rotary press has become known, in which the pressing surface of the upper punch is greater than the cross-sectional area of the die holes. In the lower pressure point position, the upper punches rest on the matrices. The upper punches are set in rotation by the pressure rollers by the pressure rollers in the distance to the longitudinal axis of the upper punch with flat end surfaces of the upper punch engage. Due to the eccentric contact with the pressure roller, the upper punches are rotated about their longitudinal axis.

Der Erfindung liegt die Aufgabe zugrunde, eine Rundlaufpresse zu schaffen, bei der ein Anhaften des Preßlings oder von Material des Preßlings auch bei unrunden Querschnittsformen der Matrizen nicht möglich ist.The invention has for its object to provide a rotary press, in which an adhesion of the compact or material of the compact is not possible even with non-round cross-sectional shapes of the matrices.

Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.This object is solved by the features of patent claim 1.

Erfindungsgemäß sind dem Rotor Mittel zugeordnet, die auf an der Preßfläche der Oberstempel anhaftende Preßlinge oder Teile davon einwirken, um ein fortdauerndes Anhaften an den Preßstempeln zu verhindern. Das wirksame Mittel stellt die Verdrehbarkeit des Oberstempels dar, wenn er in seiner unteren Totpunktlage mit seiner Preßfläche annähernd auf Höhe der zugekehrten Fläche der Matrizenscheibe bzw. der oberen Fläche der Matrize liegt. Hierbei taucht während des Preßvorgangs der Oberstempel nicht in die Matrize ein, wie dies bei herkömmlichen Rundlaufpressen der Fall ist, sondern der tiefste Punkt der Preßfläche ist die Matrizenoberkante. Der Durchmesser der Preßfläche ist größer als der Durchmesser der Matrizenbohrung. Somit ist die Matrize vollständig abgedeckt, und der Preßvorgang erfolgt im wesentlichen durch den Unterstempel, während der Oberstempel lediglich dem Preßdruck gegenhält.According to the invention, means are associated with the rotor which act on pressed on the pressing surface of the upper punch compacts or parts thereof, to prevent a continuous sticking to the Preßstempeln. The effective means represents the rotatability of the upper punch when it lies in its bottom dead center with its pressing surface approximately at the level of the facing surface of the die plate or the upper surface of the die. In this case, during the pressing process, the upper punch does not dive into the die, as is the case with conventional rotary presses, but the lowest point of the pressing face is the upper die edge. The diameter of the pressing surface is larger than the diameter of the die bore. Thus, the die is completely covered, and the pressing is carried out essentially by the lower punch, while the upper punch only counteracts the pressing pressure.

Die Drehbewegung des Preßstempels kann z.B. in der Weise durchgeführt werden, wie durch die DE 100 24 340 C2 bereits beschrieben.The rotational movement of the press ram can be carried out, for example, in such a way as by the DE 100 24 340 C2 already described.

Nach einer Ausgestaltung der Erfindung ist die Preßfläche annähernd gleich dem Außendurchmesser der Matrize. Dadurch ist sichergestellt, daß bei einem gewissen Höhenversatz zwischen Matrizenplattenoberkante und Oberseite der Matrize der Oberstempel nicht auf der Matrizenoberkante aufsetzt. Die Außenkante des Oberstempels kann unrund bzw. polygonal sein, und der Querschnitt der Matrizenbohrung ist entsprechend ausgeführt. Der Oberstempel sollte so bemessen sein, daß die Matrizenbohrung vollständig abgedeckt ist.According to one embodiment of the invention, the pressing surface is approximately equal to the outer diameter of the die. This ensures that at a certain height offset between Matrizenplattenoberkante and top of the die Upper punch does not touch the upper edge of the die. The outer edge of the upper punch may be non-circular or polygonal, and the cross-section of the die bore is carried out accordingly. The upper punch should be sized so that the die bore is completely covered.

Nach einer weiteren bevorzugten Ausgestaltung der Erfindung ist die Preßfläche der Oberstempel an Einsätzen am Schaft des Preßstempels ausgebildet, wobei die Einsätze aus einem formstabilen, haftarmen Kunststoff gebildet sind. Der Kunststoff ist z.B. PEEK, der ausreichende Festigkeit besitzt, andererseits jedoch einem Ankleben des Preßmaterials entgegenwirkt. Man unterscheidet bekanntlich zwischen einem sogenannten Fett- und einem Zuckerkleben. Besonders kritisch ist das Fettkleben, wie es z.B. beim Verpressen von Brühwürfeln oder dergleichen auftritt. Die Kunststoffeinsätze sind vorzugsweise auswechselbar, so daß bei einer Beschädigung lediglich diese ausgetauscht werden und nicht der gesamte Preßstempel. Es ist daher zweckmäßig, wenn die Einsätze nicht mit den Preßstempeln verklebt werden, sondern auf andere Weise angebracht sind.According to a further preferred embodiment of the invention, the pressing surface of the upper punch is formed on inserts on the shank of the press ram, wherein the inserts are formed from a dimensionally stable, low-adhesion plastic. The plastic is e.g. PEEK, which has sufficient strength, but on the other hand counteracts sticking of the pressing material. It is known to distinguish between a so-called fat and a sugar cake. Particularly critical is the sticking of the fat, as e.g. occurs during the compression of bouillon cubes or the like. The plastic inserts are preferably interchangeable, so that in case of damage only these are replaced and not the entire ram. It is therefore expedient if the inserts are not glued to the press punches, but are mounted in a different way.

Zusätzlich oder alternativ kann dem Rotor eine Schlagvorrichtung zugeordnet werden, die während des Rückhubes der Oberstempel einen oder mehrere Schläge auf den Preßstempel gibt. Dadurch wird ein anhaftender Preßling von der Preßfläche gelöst. Gegebenenfalls erfolgt auch ein Lösen von anhaftenden Teilen des Preßlings.Additionally or alternatively, the rotor can be associated with a percussion device, which during the return stroke of the upper punch one or more blows on the ram. As a result, an adhering compact is released from the pressing surface. Optionally, there is also a release of adhering parts of the compact.

Eine andere alternative Möglichkeit zum Lösen eines anhaftenden Preßlings oder Teilen davon besteht nach einer Ausgestaltung der Erfindung darin, daß eine Vorrichtung zum Erwärmen oder Kühlen der Oberstempel vorgesehen ist. Eine Kühlung sorgt dafür, daß von vornherein ein Anhaften verhindert wird. Ein Erwärmen kann vor allen Dingen dazu führen, anhaftendes Material abzulösen. Das Erwärmen oder Kühlen kann z.B. mit Hilfe eines Gases stattfinden, beispielsweise mit kaltem Stickstoff.Another alternative possibility for releasing an adhering compact or parts thereof according to one embodiment of the invention is that a device for heating or cooling of the upper punches is provided. Cooling ensures that adherence is prevented from the outset. Above all else, warming can lead to detaching adhering material. The Heating or cooling can take place, for example, with the aid of a gas, for example with cold nitrogen.

Alternativ kann dem Rotor selbst eine Vorrichtung zum Kühlen des Preßmaterials zugeordnet werden.Alternatively, a device for cooling the pressing material can be assigned to the rotor itself.

Da nicht immer verhindert werden kann, daß an der Preßfläche der Oberstempel Rückstände anhaften, sieht eine andere Ausgestaltung der Erfindung vor, daß eine Reinigungsvorrichtung vorgesehen ist zum Reinigen der Preßflächen der Oberstempel nach dem Preßvorgang. Die Reinigungsvorrichtung kann z.B. Abstreifmittel aufweisen, mit denen die Preßfläche der Oberstempel gereinigt wird. Zusätzlich oder alternativ kann auch eine Ultraschall-Reinigungsvorrichtung vorgesehen werden.Since it can not always be prevented that residues stick to the pressing surface of the upper punch, another embodiment of the invention provides that a cleaning device is provided for cleaning the pressing surfaces of the upper punch after the pressing operation. The cleaning device may e.g. Have stripping means with which the pressing surface of the upper punch is cleaned. Additionally or alternatively, an ultrasonic cleaning device may be provided.

Die Erfindung wird nachfolgend anhand eines in einer Zeichnung dargestellten Ausführungsbeispiels näher erläutert.The invention will be explained in more detail with reference to an embodiment shown in a drawing.

Die einzige Figur zeigt schematisch einen Schnitt durch einen Rotor mit Ober- und Unterstempel in einer Preßstation.The single figure shows schematically a section through a rotor with upper and lower punch in a pressing station.

Ein Rotor 10 einer Rundlaufpresse ist um eine vertikale Achse mittels eines nicht gezeigten Antriebs drehbar gelagert. Die Lagerung und auch sonstige Teile der Rundlaufpresse sind nicht gezeigt, da allgemein bekannt. Der Rotor 10 weist eine Matrizenscheibe 12 auf, die in vorgegebener Teilung mit einer Reihe von Matrizen 14 versehen ist, die in entsprechenden Bohrungen der Matrizenscheibe 12 eingelassen sind. Die Matrizen 14 dienen zur Aufnahme eines zu verpressenden Materials, wie bei 16 dargestellt. Im vorliegenden Fall soll der Querschnitt der Matrizenbohrungen viereckig sein, z.B. zum Verpressen von Material für Brühwürfel.A rotor 10 of a rotary press is rotatably mounted about a vertical axis by means of a drive, not shown. The storage and other parts of the rotary press are not shown, as is well known. The rotor 10 has a die plate 12, which is provided in a predetermined pitch with a series of matrices 14 which are embedded in corresponding holes of the die plate 12. The dies 14 serve to receive a material to be pressed, as shown at 16. In the present case, the cross section of the Matrizenbohrungen be square, for example for pressing material for bouillon cubes.

In oberen und unteren Führungen 18, 20a des Rotors 10 sind Ober- und Unterstempel vertikal verschiebbar angeordnet. In der Zeichnung sind ein Oberstempel 20 und ein Unterstempel 22 zu Erläuterungszwecken dargestellt. Es versteht sich, daß entsprechend zur Anzahl von Matrizen 14 eine entsprechende Anzahl von Ober- und Unterstempeln mit entsprechender Teilung vorgesehen ist. Wie erkennbar, ragt der Unterstempel 22 mit seiner Preßfläche einen vorgegebenen Betrag in die Bohrung der Matrize 14 hinein.In upper and lower guides 18, 20a of the rotor 10 upper and lower punches are arranged vertically displaceable. In the drawing, an upper punch 20 and a lower punch 22 are shown for explanatory purposes. It is understood that corresponding to the number of matrices 14 a corresponding number of upper and lower punches is provided with a corresponding division. As can be seen, the lower punch 22 projects with its pressing surface a predetermined amount into the bore of the die 14.

Die Ober- und Unterstempel werden mit Hilfe von nicht gezeigten Führungen in ihrer Relativlage zur Matrizenscheibe 12 geführt. Nähert sich ein Stempelpaar 20, 22 einer Preßstation, in der eine obere Druckrolle 24 und eine untere Druckrolle 26 angeordnet sind, werden die Stempel mit ihren entsprechenden Preßflächen in vorgegebener Weise geführt. Dabei befindet sich der Unterstempel 22 bereits innerhalb der Matrize 14, während der Oberstempel 20 sich außerhalb der Matrize befindet, und zwar während der Befüllung und auch danach, wobei der Oberstempel 20 dann allmählich in Richtung Matrizenscheibe 12 verstellt wird. Unterhalb bzw. oberhalb der Druckrollen 24, 26 werden die Stempel 20, 22 um eine vorgegebene Strecke verstellt, um einen Preßvorgang zu bewerkstelligen.The upper and lower punches are guided by means of guides not shown in their relative position to the die plate 12. Approaches a pair of dies 20, 22 of a pressing station in which an upper pressure roller 24 and a lower pressure roller 26 are arranged, the stamp are guided with their respective pressing surfaces in a predetermined manner. In this case, the lower punch 22 is already within the die 14, while the upper punch 20 is located outside of the die, during filling and also after, the upper punch 20 is then gradually adjusted in the direction Matrizenscheibe 12. Below or above the pressure rollers 24, 26, the punches 20, 22 are adjusted by a predetermined distance to accomplish a pressing operation.

Bei der Ausführungsform nach der Zeichnung ist der Oberstempel 20 dreiteilig ausgebildet, nämlich mit einem Schaft 28, der am oberen Ende eine Eingriffsfläche für die Druckrolle 24 aufweist, einem Einsatz 30, der auswechselbar am Schaft 20 ausgebildet ist und einem Kunststoffabschnitt 32 am Einsatz 30, der z.B. mit dem Einsatz 30 verklebt ist. Es ist jedoch auch eine Verbindung zwischen den Teilen mittels Schrauben denkbar. Wie erkennbar, ist der Durchmesser des Kunststoffabschnitts 32 bzw. seine Kantenlänge entsprechend der Kantenlänge der im Querschnitt rechteckigen oder quadratischen Matrizenbuchse. Diese ist so bemessen, daß sie bündig mit der zugekehrten Seite der Matrizenscheibe 12 abschließt. Wie aus der Figur ferner erkennbar, liegt der Kunststoffabschnitt 32, der vorzugsweise plan ist, auf der Matrize 14 auf, wenn der Oberstempel 20 seine maximale unterste Position erreicht. Der Kunststoffabschnitt 32 ist aus einem formbeständigen, vorzugsweise antihaftend wirkenden Kunststoffmaterial geformt.In the embodiment according to the drawing, the upper punch 20 is formed in three parts, namely with a shaft 28 having an engagement surface for the pressure roller 24 at the upper end, an insert 30 which is replaceably formed on the shaft 20 and a plastic portion 32 on the insert 30, the example is glued to the insert 30. However, it is also conceivable a connection between the parts by means of screws. As can be seen, the diameter of the Plastic section 32 and its edge length corresponding to the edge length of rectangular in cross-section or square Matrizenbuchse. This is dimensioned so that it is flush with the facing side of the die plate 12. As can also be seen from the figure, the plastic portion 32, which is preferably planar, rests on the die 14 when the upper punch 20 reaches its maximum lowermost position. The plastic portion 32 is formed from a dimensionally stable, preferably non-adhesive plastic material.

Bei dem Rückhub des Oberstempels 20, der unmittelbar nach Verlassen des tiefsten Punktes der Druckrolle 24 beginnt, wird der drehbar gelagerte Oberstempel 20 in Drehung versetzt. Dies ist bei 34 gestrichelt angedeutet. Die Drehung ist mit dem Pfeil 36 angedeutet und der Rückhub mit dem Pfeil 38. Es versteht sich, daß bei der tatsächlichen Ausführung auch die Matrize 14 vertikal zum Oberstempel 34 ausgerichtet ist, wenn der Rückhub beginnt. Die beschriebene Drehung des Oberstempels 34 kann auf irgendeine bekannte Art und Weise durchgeführt werden. So kann die Drehung beispielsweise in der Weise erfolgen, wie dies in EP 0 448 190 B1 beschrieben ist oder, was bevorzugt angewendet wird, in der Art und Weise, wie in DE 100 24 340 C2 offenbart. Hierbei entfallen aufwendige Vorkehrungen in der Rundlaufpresse, da der Drehmechanismus innerhalb der Stempel realisiert ist.In the return stroke of the upper punch 20, which begins immediately after leaving the lowest point of the pressure roller 24, the rotatably mounted upper punch 20 is rotated. This is indicated by dashed lines at 34. The rotation is indicated by the arrow 36 and the return stroke by the arrow 38. It is understood that in the actual embodiment, the die 14 is aligned vertically to the upper punch 34 when the return stroke begins. The described rotation of the upper punch 34 may be performed in any known manner. Thus, the rotation can be done, for example, in the manner as in EP 0 448 190 B1 is described or, which is preferably applied, in the manner as in DE 100 24 340 C2 disclosed. This eliminates complex precautions in the rotary press, since the rotation mechanism is realized within the stamp.

Die Drehung der Oberstempel 20 bewirkt, daß möglicherweise an der Preßfläche anhaftendes Material gelöst wird und der Rückhub des Oberstempels 20 nicht dazu führt, daß der Preßling oder Teile davon an der Preßfläche anhaften.The rotation of the upper punches 20 causes possibly adhering to the pressing surface material is released and the return stroke of the upper punch 20 does not cause the compact or parts thereof to adhere to the pressing surface.

Es ist denkbar, zur Verbesserung eines Antihafteffekts auf die Preßfläche des Oberstempels 20 eine Antihaftbeschichtung aufzubringen, beispielsweise kalt lösliche Stärke aufzusprühen. Es ist alternativ oder zusätzlich denkbar, die Oberstempel 20 zu erwärmen oder zu kühlen, beispielsweise indem heißes oder kaltes Gas auf die Preßstempel bzw. die Preßfläche gerichtet wird. Es ist natürlich auch denkbar, das zu verpressende Material 16 vorher in einem gewissen Maße zu kühlen, ohne daß seine Verpressungsfähigkeit leidet, um den Hafteffekt zu reduzieren. Schließlich ist auch denkbar, die Preßfläche nach dem Verpreßvorgang zu reinigen, z.B. mit Hilfe eines Abstreifers oder mit Hilfe von Ultraschall. Sämtliche zuletzt erwähnten Vorkehrungen, die zusätzlich oder alternativ zur Drehung des Preßstempels eingesetzt werden können, sind jedoch nicht dargestellt.It is conceivable to apply a non-stick coating to improve an anti-adhesion effect on the pressing surface of the upper punch 20, for example by spraying cold-soluble starch. It is alternatively or additionally conceivable to heat or cool the upper punches 20, for example by hot or cold gas on the Preßstempel or the pressing surface is addressed. Of course, it is also conceivable to cool the material to be pressed 16 to a certain extent beforehand, without its compressibility suffers, in order to reduce the adhesive effect. Finally, it is also conceivable to clean the pressing surface after the pressing operation, for example by means of a scraper or with the aid of ultrasound. All last-mentioned precautions that can be used in addition to or alternatively to the rotation of the ram, however, are not shown.

Claims (12)

  1. Rotary press comprising a rotor rotatably driven about a vertical axis, said rotor comprising a die plate (12) and upper and lower punches (20, 22) which are vertically guided in guides of the rotor cooperating with die holes (14) in a die plate (12), at least one press station comprising an upper an a lower pressure roller where upper and lower punches pass by and through which they are moved towards the die hole in order to compress the material in the die hole, wherein in the direction of the rotation behind the press station guiding means are provided, which cause a return stroke of upper and lower punches (20, 22) from the lower or upper pressure point position and wherein further the rotor is provided with rotational means which cause a rotation of the upper punches (20) around their longitudinal axis, characterized in that the pressing surface of the upper punches (20) is larger than the surface of the die hole and the pressing surface entirely covers the die hole, that the rotational means for rotating the upper punches (20) are designed such that they cause a rotation of the upper punches (20) during their return stroke, and the upper pressure roller (24) is adjusted such that the pressing surface of the upper punch (20) in the bottom dead center position is level with the facing surface of the die plate (12) or the upper surface of the die (14).
  2. Rotary press according to claim 1, characterized in that the pressing surface of the upper punch is equal to the outer diameter of the die (14).
  3. Rotary press according to claim 1 or 2, characterized in that the pressing surface of at least the upper punches (20) is formed at inserts (30) of the punches and the inserts comprise a dimensionally stable, lightly adhering plastic section (32).
  4. Rotary press according to claim 3, characterized in that the inserts (30) or the plastic sections (32) are exchangeable.
  5. Rotary press according to any of the claims 1 to 4, characterized in that the rotor is provided with a spraying device, which sprays an anti-adhering agent on the pressing surface of the upper punches (20).
  6. Rotary press according to any of the claims 1 to 5, characterized in that the rotor is such provided with an impacting mechanism which gives one or more impacts on the upper punches (20) during the return stroke of the upper punches.
  7. Device according to any of the claims 1 to 6, characterized in that the rotor is provided with a device for heating or cooling of the upper punches (20).
  8. Rotary press according to claim 7, characterized in that the device directs hot or cold gas to the pressing surface of the upper punches.
  9. Rotary press according to any of the claims 1 to 8, characterized in that the rotor is provided with a device for cooling of the material to be compressed before it filling in in the dies (14) or within the dies (14).
  10. Rotary press according to any of the claims 1 to 9, characterized in that the rotor is provided with a cleaning device for cleaning of the pressing surface of the upper punches (20) after the pressing process.
  11. Rotary press according to claim 10, characterized in that the cleaning device comprises wiping means, with which the pressing surfaces of the upper punches can be cleaned.
  12. Rotary press according to claim 10, characterized in that an ultrasound cleaning device is provided.
EP05021998A 2004-10-20 2005-10-08 Rotary press Not-in-force EP1666237B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004051006A DE102004051006B4 (en) 2004-10-20 2004-10-20 Rotary press

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EP1666237A2 EP1666237A2 (en) 2006-06-07
EP1666237A3 EP1666237A3 (en) 2006-10-18
EP1666237B1 true EP1666237B1 (en) 2011-09-14

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EP05021998A Not-in-force EP1666237B1 (en) 2004-10-20 2005-10-08 Rotary press

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US (1) US7654814B2 (en)
EP (1) EP1666237B1 (en)
JP (1) JP4469322B2 (en)
AT (1) ATE524306T1 (en)
DE (1) DE102004051006B4 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2534956A1 (en) * 2011-06-16 2012-12-19 Nestec S.A. Bouillon tablet process
DE102019104676A1 (en) * 2019-02-25 2020-08-27 GTE General Tool Engineering GmbH Tableting punch, tabletting arrangement consisting of upper punch and lower punch and die as well as a pressing process for the tabletting arrangement
DE102022115278A1 (en) 2022-06-20 2023-12-21 Dorst Technologies Gmbh & Co. Kg Device for cleaning a powder press device, combination of a powder press device with such a cleaning device and method for cleaning a powder press device

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Also Published As

Publication number Publication date
JP2006116606A (en) 2006-05-11
DE102004051006A1 (en) 2006-04-27
JP4469322B2 (en) 2010-05-26
US20060083804A1 (en) 2006-04-20
EP1666237A2 (en) 2006-06-07
EP1666237A3 (en) 2006-10-18
US7654814B2 (en) 2010-02-02
DE102004051006B4 (en) 2009-07-02
ATE524306T1 (en) 2011-09-15

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