EP0642918B1 - Device for controlling a press for making green bricks - Google Patents

Device for controlling a press for making green bricks Download PDF

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Publication number
EP0642918B1
EP0642918B1 EP94111269A EP94111269A EP0642918B1 EP 0642918 B1 EP0642918 B1 EP 0642918B1 EP 94111269 A EP94111269 A EP 94111269A EP 94111269 A EP94111269 A EP 94111269A EP 0642918 B1 EP0642918 B1 EP 0642918B1
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EP
European Patent Office
Prior art keywords
path
pressing
ram
lower ram
press
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Expired - Lifetime
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EP94111269A
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German (de)
French (fr)
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EP0642918A1 (en
Inventor
Günter Dipl.-Ing. Hofmann
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Langenstein and Schemann GmbH
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Langenstein and Schemann 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
    • B30B11/005—Control arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
    • B28B3/08—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form with two or more rams per mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/18—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram
    • B30B15/20—Control arrangements for fluid-driven presses controlling the reciprocating motion of the ram controlling the speed of the ram, e.g. the speed of the approach, pressing or return strokes

Definitions

  • the invention relates to a control of a stone molding press, in which a hydraulic piston-cylinder device acts on an upper punch and a lower punch and the upper punch and the lower punch work from below onto a mold filled with molding compound, and in which one Pre-compression of the molding compound is provided from below and for pressing the molding compound a movement of the upper die and a movement of the lower die is provided in each case by a pressing path, the pressing path of the upper die being smaller than the pressing path of the lower die and simultaneous movements of the upper die and the lower die is provided.
  • a control of this type is known with the exception (DE-A-2 612 167) that the press travel of the upper punch is not specified as being smaller than the press travel of the lower punch.
  • Stone molding presses and their control are known (DE-A-14 59 276, DE-A-28 31 166, DE-A-37 23 352).
  • the pressing paths are predetermined by end stops, which interact with the punches or the piston-cylinder devices, or predetermined by valve opening times, to which certain quantities of pressure fluid supplied and thus certain movement paths of the piston-cylinders Facilities.
  • the pressing path of the upper punch is shorter because mandrels protrude from below into the form, in front of which the upper punch stops.
  • the correct amount of molding compound to be entered into the mold for each stone molding can be set by pressure measurements during pressing.
  • the upper punch completes its pressing path at very short notice and is only given during this very short period of simultaneous movement of the upper stamp and lower stamp and the lower stamp continues to move after the upper stamp has come to a standstill in order to complete its pressing path.
  • the speeds of the movements of the upper stamp and lower stamp are uncontrolled. It can now be seen that the compression of the finished stone molding over its height, between the upper punch side and the lower punch side, is not satisfactorily uniform.
  • An object of the invention is therefore to provide a control of the type mentioned, on the basis of which the uniformity of the compression of the molding composition is improved over the height of the finished stone molding.
  • the control according to the invention is solving this problem, characterized in that a continuous path measurement is provided on the upper punch and on the lower punch and the movements of the upper punch and lower punch for pressing are continuously controlled using a computer in such a way that the different pressing paths are at the same speed at different speeds Time.
  • the finished stone molding has an improved uniformity of the compression over the height.
  • the upper stamp ends its press travel movement simultaneously with the lower stamp and moves relatively slowly relative to the lower stamp.
  • the highest possible speed of the lower punch is selected.
  • the path control is important for the improved stone quality.
  • the finished stone form is not moved in the form, but is located on the due to the path control desired position.
  • the improvement in the uniformity of the compression is also to be seen in connection with the fact that the pre-compression has been carried out from below and the upper region of the pre-compressed molding composition is even looser than the lower regions before pressing. Due to the continuous path control, the required height of the stone form can be maintained in an improved manner. As a rule, mandrels protrude from the bottom upwards into the mold.
  • pre-compression it is possible to carry out the pre-compression depending on the pressure. It is particularly expedient and advantageous if the pre-compression is provided by moving the lower die through a pre-compression path and the movement of the lower die via the pre-compression path is controlled away by means of the continuous path measurement. This improves the use of the measuring device provided for distance measurement. In the case of path-dependent control of the lower punch for pre-compression, the computer is informed of the position of the lower punch at the beginning of the pressing path.
  • the control according to the invention can possibly. also provide if the mold is not assigned any mandrels to create cavities in the stone molding. However, it is particularly expedient and advantageous if the lower stamp is penetrated by thorns projecting into the shape. Due to the control according to the invention, the upper punch works until the lower punch stops, i.e. over a long period of time towards the free ends of the mandrels.
  • the present control of the stone molding press is primarily used for the production of sand-lime bricks, but is suitable for other types of stones. Primarily stone moldings with cavities and possibly stone moldings for solid stones are produced.
  • the press is a double-sided compacting press.
  • the piston-cylinder devices work hydraulically and are connected to a pump drive that tries to keep the hydraulic pressure constant.
  • the computer determines the assigned speeds which are required in each case in order to cover the different pressing paths in the same time span; on the basis of the path measurements and the assigned speeds, it issues the necessary control commands which actuate a pressure valve in the pressure fluid supply to the respective piston-cylinder devices.
  • the computer controls these two press valves, ie their opening time and opening width.
  • the correct amount of molding compound to be entered into the mold for each stone molding can be set by pressure measurements during pressing.
  • a pump drive is assigned to the piston-cylinder devices, which is connected to the two piston-cylinder devices via a pressure valve, and if the computer determines the two pressure valves in accordance with the respective displacement measurements and the associated ones Speeds opens or closes. This is an easy to implement embodiment of the control according to the invention.
  • the lower punch is controlled for a short distance after the pressing path has been completed before the finished stone molding is pushed out.
  • the stone form wants namely expand slightly after pressing and this expansion is created by the short backward movement of the lower punch downward space, so that the expansion does not take place during the pushing out, which can lead to damage to the edges of the stone molding.
  • an upper punch 1 and a lower punch 2 can be moved up and down in a press frame (not shown), between which a shape (not shown) is arranged, into which mandrels (not shown below) project which penetrate the lower punch.
  • the upper punch 1 is driven by a piston-cylinder device 3, which has a double-acting piston 4 in a cylinder, one side of which is supplied with pressurized liquid for pressing via a supply line 5 and the other side for pressurized supply via a supply line 6.
  • the lower punch 2 is driven by a piston-cylinder device 7, which has two single-acting pistons 8 in each cylinder and a double-acting piston 9 in a cylinder.
  • the two single-acting pistons 8 are pressurized with hydraulic fluid via a feed line 10.
  • the two single-acting pistons 8 and one side of the double-acting piston 9 are acted upon via a feed line 11.
  • the other side of the double-acting piston 9 is supplied with pressure fluid 12 via a feed line for withdrawal.
  • the upper stamp 1 and the lower stamp 2 each drive over Linkage 13 is a spindle 14 which actuates an actuator 15 which works on a computer unit 16.
  • the computer unit 16 controls a servomotor 17 which operates a pressure valve 18 to which the supply line 5 is connected.
  • the press valve 18 is fed by a slide 19, on which a pump 20 works and which is optionally switched to supplying the feed line 6 for withdrawal.
  • a valve 21 is also installed in the feed line 11, in front of which the feed line 10 branches off to the two single-acting pistons 8. For the withdrawal, the slide 19 are brought into a first position.
  • the slide 19 of the lower punch 2 is first brought into a second position and the valve 21 is kept closed, so that only the two single-acting pistons 8 are acted on via the pressure valve 18.
  • the slide 19 of the upper punch 1 is also brought into the second position and the valve 21 is opened.
  • One press valve 18 is open to the double-acting piston 4 of the upper punch 1 and the other press valve 18 is open to the double-acting piston 9 and the two single-acting pistons 8 of the lower punch 2.
  • the size and duration of the opening widths of the pressure valves 18 are changed in order to move the upper punch and the lower punch for pressing during the same period of time at different speeds over different distances.
  • the size and duration of the respective opening width is determined by the associated computer unit 16, which is fed with information by the position measuring device 13, 14, 15.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Control Of Presses (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)

Description

Die Erfindung betrifft eine Steuerung einer Steinformling-Presse, bei der an einem Oberstempel und an einem Unterstempel jeweils eine hydraulische Kolben-Zylinder-Einrichtung angreift und der Oberstempel von oben und der Unterstempel von unten auf eine mit Formmasse gefüllte Form arbeiten, und bei der eine Vorverdichtung der Formmasse von unten vorgesehen ist und zum Pressen der Formmasse eine Bewegung des Oberstempels und eine Bewegung des Unterstempels jeweils um einen Preßweg vorgesehen ist, wobei der Preßweg des Oberstempels kleiner als der Preßweg des Unterstempels ist und eine Gleichzeitigkeit der Bewegungen des Oberstempels und des Unterstempels vorgesehen ist.The invention relates to a control of a stone molding press, in which a hydraulic piston-cylinder device acts on an upper punch and a lower punch and the upper punch and the lower punch work from below onto a mold filled with molding compound, and in which one Pre-compression of the molding compound is provided from below and for pressing the molding compound a movement of the upper die and a movement of the lower die is provided in each case by a pressing path, the pressing path of the upper die being smaller than the pressing path of the lower die and simultaneous movements of the upper die and the lower die is provided.

Eine Steuerung dieser Art ist mit der Ausnahme bekannt (DE-A-2 612 167), daß der Preßweg des Oberstempels nicht als kleiner als der Preßweg des Unterstempels angegeben ist. Steinformling-Pressen und deren Steuerung sind bekannt (DE-A-14 59 276, DE-A-28 31 166, DE-A-37 23 352). Bei einer durch die Praxis bekannten Steuerung der eingangs genannten Art sind die Preßwege durch Endanschläge, die mit den Stempeln oder den Kolben-Zylinder-Einrichtungen zusammenwirken, vorgegeben oder durch Ventilöffnungszeiten vorgegeben, denen bestimmte Mengen an zugeführter Druckflüssigkeit und damit bestimmte Bewegungswege der Kolben-Zylinder-Einrichtungen entsprechen. Der Preßweg des Oberstempels ist kürzer, weil von unten Dorne in die Form ragen, vor welchen der Oberstempel stehenbleibt. Die richtige Menge der pro Steinformling in die Form einzugegebenden Formmasse läßt sich durch Druckmessungen beim Pressen einstellen. Bei dieser Steuerung vollendet der Oberstempel seinen Preßweg sehr kurzfristig und ist nur während dieser sehr kurzen Frist Gleichzeitigkeit der Bewegungen von Oberstempel und Unterstempel gegeben und bewegt sich der Unterstempel nach dem Stillstand des Oberstempels weiter, um seinen Preßweg zu vollenden. Die Geschwindigkeiten der Bewegungen von Oberstempel und Unterstempel sind ungesteuert. Es zeigt sich nun, daß die Verdichtung des fertigen Steinformlings über dessen Höhe, zwischen Oberstempelseite und Unterstempelseite, nicht befriedigend gleichmäßig ist.A control of this type is known with the exception (DE-A-2 612 167) that the press travel of the upper punch is not specified as being smaller than the press travel of the lower punch. Stone molding presses and their control are known (DE-A-14 59 276, DE-A-28 31 166, DE-A-37 23 352). In a control of the type mentioned at the outset known in practice, the pressing paths are predetermined by end stops, which interact with the punches or the piston-cylinder devices, or predetermined by valve opening times, to which certain quantities of pressure fluid supplied and thus certain movement paths of the piston-cylinders Facilities. The pressing path of the upper punch is shorter because mandrels protrude from below into the form, in front of which the upper punch stops. The correct amount of molding compound to be entered into the mold for each stone molding can be set by pressure measurements during pressing. With this control, the upper punch completes its pressing path at very short notice and is only given during this very short period of simultaneous movement of the upper stamp and lower stamp and the lower stamp continues to move after the upper stamp has come to a standstill in order to complete its pressing path. The speeds of the movements of the upper stamp and lower stamp are uncontrolled. It can now be seen that the compression of the finished stone molding over its height, between the upper punch side and the lower punch side, is not satisfactorily uniform.

Eine Aufgabe der Erfindung ist es daher, eine Steuerung der eingangs genannten Art zu schaffen, aufgrund welcher die Gleichmäßigkeit der Verdichtung der Formmasse über die Höhe des fertigen Steinformlings verbessert ist. Die erfindungsgemäße Steuerung ist, diese Aufgabe lösend, dadurch gekennzeichnet, daß eine fortlaufende Wegmessung am Oberstempel und am Unterstempel vorgesehen ist und die Bewegungen von Oberstempel und Unterstempel zum Pressen derart unter Einsatz eines Rechners fortlaufend weggegesteuert sind, daß die verschiedenen Preßwege mit verschiedenen Geschwindigkeiten in gleicher Zeit zurückgelegt sind.An object of the invention is therefore to provide a control of the type mentioned, on the basis of which the uniformity of the compression of the molding composition is improved over the height of the finished stone molding. The control according to the invention is solving this problem, characterized in that a continuous path measurement is provided on the upper punch and on the lower punch and the movements of the upper punch and lower punch for pressing are continuously controlled using a computer in such a way that the different pressing paths are at the same speed at different speeds Time.

Bei der erfindungsgemäß vorgesehenen Wegsteuerung der Preßwege von Oberstempel und Unterstempel weist der fertige Steinformling über die Höhe eine verbesserte Gleichmäßigkeit der Verdichtung auf. Der Oberstempel beendet seine Preßweg-Bewegung gleichzeitig mit dem Unterstempel und bewegt sich relativ zum Unterstempel relativ langsam. Im Hinblick auf die erwünschte hohe Taktzeit der Steinformling-Presse wird eine möglichst hohe Geschwindigkeit des Unterstempels gewählt. Für die verbesserte Steinqualität ist die Wegsteuerung wichtig. Der fertige Steinformling wird in der Form nicht verschoben, sondern befindet sich aufgrund der Wegsteuerung an der erwünschten Stelle. Die Verbesserung der Gleichmäßigkeit der Verdichtung ist auch im Zusammenhang damit zu sehen, daß die Vorverdichtung von unten erfolgt ist und der obere Bereich der vorverdichteten Formmasse vor dem Pressen noch lockerer ist als untere Bereiche. Durch die fortlaufende Wegsteuerung läßt sich auch die geforderte Höhe des Steinformlings verbessert einhalten. In der Regel ragen Dorne von unten nach oben in die Form.With the path control of the pressing paths of the upper punch and lower punch provided according to the invention, the finished stone molding has an improved uniformity of the compression over the height. The upper stamp ends its press travel movement simultaneously with the lower stamp and moves relatively slowly relative to the lower stamp. In view of the desired high cycle time of the stone molding press, the highest possible speed of the lower punch is selected. The path control is important for the improved stone quality. The finished stone form is not moved in the form, but is located on the due to the path control desired position. The improvement in the uniformity of the compression is also to be seen in connection with the fact that the pre-compression has been carried out from below and the upper region of the pre-compressed molding composition is even looser than the lower regions before pressing. Due to the continuous path control, the required height of the stone form can be maintained in an improved manner. As a rule, mandrels protrude from the bottom upwards into the mold.

Es ist möglich, die Vorverdichtung druckabhängig durchzuführen. Besonders zweckmäßig und vorteilhaft ist es, wenn die Vorverdichtung durch eine Bewegung des Unterstempels um einen Vorverdichtungsweg vorgesehen ist und die Bewegung des Unterstempels über den Vorverdichtungsweg mittels der fortlaufenden Wegmessung weggesteuert ist. Dies verbessert die Nutzung der für die Wegmessung vorgesehenen Meßeinrichtung. Bei einer wegabhängigen Steuerung des Unterstempels zur Vorverdichtung ist der Rechner bei Beginn des Preßweges über die Position des Unterstempels informiert.It is possible to carry out the pre-compression depending on the pressure. It is particularly expedient and advantageous if the pre-compression is provided by moving the lower die through a pre-compression path and the movement of the lower die via the pre-compression path is controlled away by means of the continuous path measurement. This improves the use of the measuring device provided for distance measurement. In the case of path-dependent control of the lower punch for pre-compression, the computer is informed of the position of the lower punch at the beginning of the pressing path.

Die erfindungsgemäße Steuerung läßt sich u.U. auch vorsehen, wenn der Form keine Dorne zur Erzeugung von Hohlräumen im Steinformling zugeordnet sind. Besonders zweckmäßig und vorteilhaft ist es jedoch, wenn der Unterstempel von in die Form ragenden Dornen durchdrungen ist. Aufgrund der erfindungsgemäßen Steuerung arbeitet der Oberstempel bis zum Stillstand des Unterstempels, d.h. über eine lange Zeitspanne in Richtung gegen die freien Enden der Dorne.The control according to the invention can possibly. also provide if the mold is not assigned any mandrels to create cavities in the stone molding. However, it is particularly expedient and advantageous if the lower stamp is penetrated by thorns projecting into the shape. Due to the control according to the invention, the upper punch works until the lower punch stops, i.e. over a long period of time towards the free ends of the mandrels.

Die hier vorliegende Steuerung der Steinformling-Presse dient vornehmlich der Herstellung von Kalksandsteinen, ist jedoch auch für Steine anderer Art geeignet. Es werden primär Steinformlinge mit Hohlräumen und u.U. auch Steinfomlinge für Vollsteine hergestellt. Bei der Presse handelt es sich um eine doppelseitig verdichtende Presse. Die Kolben-Zylinder-Einrichtungen arbeiten hydraulisch und sind an einen Pumpenantrieb angeschlossen, der versucht, den Hydraulikdruck konstant zu halten. Der Rechner ermittelt aus den beiden jeweiligen Wegmessungen die zugeordneten Geschwindigkeiten, die jeweils erforderlich sind, um die verschiedenen Preßwege in der gleichen Zeitspanne zurückzulegen; aufgrund der Wegmessungen und der zugeordneten Geschwindigkeiten gibt er die erforderlichen Steuerbefehle ab, welche ein Preßventil in der Druckflüssigkeitszufuhr zu den jeweiligen Kolben-Zylinder-Einrichtungen betätigen. Der Rechner steuert diese beiden Preßventile, d.h. deren Öffnungszeit und Öffnungsweite. Die richtige Menge der pro Steinformling in die Form einzugebenden Formmasse läßt sich durch Druckmessungen beim Pressen einstellen.The present control of the stone molding press is primarily used for the production of sand-lime bricks, but is suitable for other types of stones. Primarily stone moldings with cavities and possibly stone moldings for solid stones are produced. The press is a double-sided compacting press. The piston-cylinder devices work hydraulically and are connected to a pump drive that tries to keep the hydraulic pressure constant. From the two respective path measurements, the computer determines the assigned speeds which are required in each case in order to cover the different pressing paths in the same time span; on the basis of the path measurements and the assigned speeds, it issues the necessary control commands which actuate a pressure valve in the pressure fluid supply to the respective piston-cylinder devices. The computer controls these two press valves, ie their opening time and opening width. The correct amount of molding compound to be entered into the mold for each stone molding can be set by pressure measurements during pressing.

Besonders zweckmäßig und vorteilhaft ist es dabei, wenn den Kolben-Zylinder-Einrichtungen ein Pumpenantrieb zugeordnet ist, der mit den beiden Kolben-Zylinder-Einrichtungen jeweils über ein Preßventil verbunden ist, und wenn der Rechner die beiden Preßventile entsprechend den jeweiligen Wegmessungen und den zugehörigen Geschwindigkeiten öffnet oder schließt. Dies ist eine einfach zu verwirklichende Ausführungsform der erfindungsgemäßen Steuerung.It is particularly expedient and advantageous if a pump drive is assigned to the piston-cylinder devices, which is connected to the two piston-cylinder devices via a pressure valve, and if the computer determines the two pressure valves in accordance with the respective displacement measurements and the associated ones Speeds opens or closes. This is an easy to implement embodiment of the control according to the invention.

Aufgrund der wegabhängigen Steuerung läßt es sich einfach verwirklichen, daß der Unterstempel nach Abschluß des Preßweges vor einem Ausschieben des fertigen Steinformlings auf einen kurzstreckigen Rückzug gesteuert ist. Der Steinformling will nämlich nach dem Pressen etwas expandieren und dieser Expansion wird durch die kurze Rückbewegung des Unterstempels auch nach unten hin Platz geschaffen, so daß die Expansion nicht während des Ausschiebens erfolgt, was zu Schäden an den Kanten des Steinformlings führen kann.Because of the path-dependent control, it can be easily realized that the lower punch is controlled for a short distance after the pressing path has been completed before the finished stone molding is pushed out. The stone form wants namely expand slightly after pressing and this expansion is created by the short backward movement of the lower punch downward space, so that the expansion does not take place during the pushing out, which can lead to damage to the edges of the stone molding.

In der Zeichnung ist eine bevorzugte Ausführungsform der Erfindung dargestellt und zwar schematisch eine Steuerung einer Steinformling-Presse.In the drawing, a preferred embodiment of the invention is shown, namely schematically a control of a stone molding press.

Gemäß Zeichnung sind in einem nicht gezeigten Pressenrahmen ein Oberstempel 1 und ein Unterstempel 2 auf- und abbewegbar, zwischen denen eine nicht gezeigte Form angeordnet ist, in welche von unten nicht gezeigte Dorne ragen, welche den Unterstempel durchdringen. Der Oberstempel 1 wird von einer Kolben-Zylinder-Einrichtung 3 getrieben, die in einem Zylinder einen doppeltwirkenden Kolben 4 aufweist, dessen einer Seite zum Pressen über eine Zuleitung 5 Druckflüssigkeit zugeführt wird und dessen anderer Seite zum Rückzug über eine Zuleitung 6 Druckflüssigkeit zugeführt wird. Der Unterstempel 2 wird von einer Kolben-Zylinder-Einrichtung 7 getrieben, die zwei einfachwirkende Kolben 8 in je einem Zylinder und einen doppeltwirkenden Kolben 9 in einen Zylinder aufweist. Für ein Vorverdichten werden die beiden einfachwirkenden Kolben 8 über eine Zuleitung 10 mit Druckflüssigkeit beaufschlagt. Für das Pressen werden die beiden einfachwirkenden Kolben 8 und die eine Seite des doppeltwirkenden Kolbens 9 über eine Zuleitung 11 beaufschlagt. Der anderen Seite des doppeltwirkenden Kolbens 9 wird zum Rückzug über eine Zuleitung 12 Druckflüssigkeit zugeführt.According to the drawing, an upper punch 1 and a lower punch 2 can be moved up and down in a press frame (not shown), between which a shape (not shown) is arranged, into which mandrels (not shown below) project which penetrate the lower punch. The upper punch 1 is driven by a piston-cylinder device 3, which has a double-acting piston 4 in a cylinder, one side of which is supplied with pressurized liquid for pressing via a supply line 5 and the other side for pressurized supply via a supply line 6. The lower punch 2 is driven by a piston-cylinder device 7, which has two single-acting pistons 8 in each cylinder and a double-acting piston 9 in a cylinder. For pre-compression, the two single-acting pistons 8 are pressurized with hydraulic fluid via a feed line 10. For the pressing, the two single-acting pistons 8 and one side of the double-acting piston 9 are acted upon via a feed line 11. The other side of the double-acting piston 9 is supplied with pressure fluid 12 via a feed line for withdrawal.

Der Oberstempel 1 und der Unterstempel 2 treibt jeweils über ein Gestänge 13 eine Spindel 14, die ein Stellglied 15 betätigt, das auf einer Rechnereinheit 16 arbeitet. Die Rechnereinheit 16 steuert einen Stellmotor 17, der ein Preßventil 18 bedient, an das die Zuleitung 5 angeschlossen ist. Das Preßventil 18 wird von einem Schieber 19 her gespeist, auf dem eine Pumpe 20 arbeitet und der wahlweise auf die Speisung der Zuleitung 6 zum Rückzug umgestellt wird. Beim Unterstempel 2 ist in die Zuleitung 11 noch ein Ventil 21 eingebaut, vor dem die Zuleitung 10 zu den beiden einfachwirkenden Kolben 8 abzweigt. Für den Rückzug werden die Schieber 19 in eine erste Stellung gebracht.The upper stamp 1 and the lower stamp 2 each drive over Linkage 13 is a spindle 14 which actuates an actuator 15 which works on a computer unit 16. The computer unit 16 controls a servomotor 17 which operates a pressure valve 18 to which the supply line 5 is connected. The press valve 18 is fed by a slide 19, on which a pump 20 works and which is optionally switched to supplying the feed line 6 for withdrawal. In the lower punch 2, a valve 21 is also installed in the feed line 11, in front of which the feed line 10 branches off to the two single-acting pistons 8. For the withdrawal, the slide 19 are brought into a first position.

Zum Vorverdichten wird zunächst der Schieber 19 des Unterstempels 2 in eine zweite Stellung gebracht und wird das Ventil 21 geschlossen gehalten, so daß über das Preßventil 18 nur die beiden einfachwirkenden Kolben 8 beaufschlagt werden. Zum Pressen wird der Schieber 19 des Oberstempels 1 ebenfalls in die zweite Stellung gebracht und wird das Ventil 21 geöffnet. Das eine Preßventil 18 ist zum doppeltwirkenden Kolben 4 des Oberstempels 1 hin geöffnet und das andere Preßventil 18 ist zum doppeltwirkenden Kolben 9 und den beiden einfachwirkenden Kolben 8 des Unterstempels 2 hin geöffnet. Über den Stellmotor 17 werden in der Größe und in der Zeitdauer wechselnde Öffnungsweiten der Preßventile 18 eingestellt, um den Oberstempel und den Unterstempel zum Pressen während der gleichen Zeitspanne mit verschiedenen Geschwindigkeiten über verschieden lange Wegstrecken zu bewegen. Die Größe und Zeitdauer der jeweiligen Öffnungsweite wird von der zugehörigen Rechnereinheit 16 bestimmt, die von dem Wegmeßgerät 13,14,15 mit Information gespeist wird.For precompression, the slide 19 of the lower punch 2 is first brought into a second position and the valve 21 is kept closed, so that only the two single-acting pistons 8 are acted on via the pressure valve 18. For pressing, the slide 19 of the upper punch 1 is also brought into the second position and the valve 21 is opened. One press valve 18 is open to the double-acting piston 4 of the upper punch 1 and the other press valve 18 is open to the double-acting piston 9 and the two single-acting pistons 8 of the lower punch 2. Via the servomotor 17, the size and duration of the opening widths of the pressure valves 18 are changed in order to move the upper punch and the lower punch for pressing during the same period of time at different speeds over different distances. The size and duration of the respective opening width is determined by the associated computer unit 16, which is fed with information by the position measuring device 13, 14, 15.

Claims (5)

  1. A control means for a green-brick press,
    in which one respective hydraulic piston-cylinder device (3, 7) engages on an upper ram (1) and on a lower ram (2) in each case, and the upper ram acts from above and the lower ram acts from below upon a mould filled with moulding material, and
    in which a pre-consolidation of the moulding material is provided from below, and a movement of the upper ram and a movement of the lower ram by a respective pressing path are provided for pressing the moulding material,
    wherein the pressing path of the upper ram is less than the pressing path of the lower ram, the pressing-path movements of the upper ram and the lower ram are in different directions, and simultaneity of the pressing-path movements of the upper ram and the lower ram is provided,
    characterized in that
    a continuous path measurement (13, 14, 15) is provided at the upper ram (1) and at the lower ram (2), and the movements of the upper ram (1) and the lower ram (2) for pressing are continuously controlled in their travel (17, 18) in such a way using a computer (16) that the different pressing paths are covered in the same time at different speeds.
  2. A control means according to Claim 1, wherein the pre-consolidation is provided by a movement of the lower ram over a pre-consolidation path, characterized in that the movement of the lower ram (2) over the pre-consolidation path is controlled in its travel (17, 18) by means of the continuous path measurement (13, 14, 15).
  3. A control means according to Claim 1 or 2, characterized in that the lower ram (2) is traversed by mandrels projecting into the mould.
  4. A control means according to Claim 1, 2 or 3, wherein the piston-cylinder devices have associated therewith a pump drive which is connected to the two piston-cylinder devices by way of a respective press valve in each case, characterized in that the computer (16) opens or closes the two press valves (18) in accordance with the respective path measurements and the associated speeds.
  5. A control means according to one of the preceding Claims, characterized in that after the end of the pressing path the lower ram (2) is controlled before ejecting the finished green brick onto a short-distance withdrawal means.
EP94111269A 1993-09-13 1994-07-20 Device for controlling a press for making green bricks Expired - Lifetime EP0642918B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4331017A DE4331017C2 (en) 1993-09-13 1993-09-13 Process for controlling a stone molding press
DE4331017 1993-09-13

Publications (2)

Publication Number Publication Date
EP0642918A1 EP0642918A1 (en) 1995-03-15
EP0642918B1 true EP0642918B1 (en) 1997-10-15

Family

ID=6497578

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94111269A Expired - Lifetime EP0642918B1 (en) 1993-09-13 1994-07-20 Device for controlling a press for making green bricks

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EP (1) EP0642918B1 (en)
DE (2) DE4331017C2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016105926A1 (en) 2016-03-31 2017-10-05 Langenstein & Schemann Gmbh Apparatus and process for producing a briquette for bricks
CN115366227B (en) * 2022-08-08 2024-04-09 四会市大美地新材料有限公司 Green brick forming process

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE338241B (en) * 1967-03-22 1971-08-30 Asea Ab
DE2035844A1 (en) * 1970-07-18 1972-01-20 Maschinenfabrik Lauffer & Butscher, 7241 Mühlen Hydraulic press - for powdered materials
US3848525A (en) * 1973-08-30 1974-11-19 Wean United Inc Control means for opposed rams of a press
DE2612167A1 (en) * 1976-03-23 1977-09-29 Dorstener Eisengiesserei U Mas Hydraulically operated limestone press - has ram each end with main cylinder and double acting control cylinder
DE2831166A1 (en) * 1978-07-15 1980-01-24 Dorstener Maschf Ag Concrete press mould regulation system - has two load measuring devices between ram piston and punch
JPS58119500A (en) * 1982-01-08 1983-07-15 Nuclear Fuel Co Ltd Controlling method of powder compacting machine
FR2570020B1 (en) * 1984-09-11 1988-07-22 Commissariat Energie Atomique AUTOMATIC PRESS
DE3706193A1 (en) * 1987-02-26 1988-09-08 Langenstein & Schemann Gmbh HYDRAULIC COLD FLOW PRESS
DE3716220A1 (en) * 1987-04-01 1988-10-20 Schmidt Feinmech PISTON PRESS
DE3723352A1 (en) * 1987-07-15 1989-02-02 Dorstener Maschf Ag Method for producing building bricks
DE3940192A1 (en) * 1989-02-02 1990-08-09 Gottfried Weber HYDRAULIC PRESS
GB9022027D0 (en) * 1990-10-10 1990-11-21 Unilever Plc Bar stamping
JPH07112638B2 (en) * 1991-05-02 1995-12-06 株式会社ヨシツカ精機 Pressure control method for powder molding press

Also Published As

Publication number Publication date
EP0642918A1 (en) 1995-03-15
DE59404330D1 (en) 1997-11-20
DE4331017C2 (en) 1999-09-23
DE4331017C1 (en) 1994-12-22

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