EP0250647B1 - Apparatus for fitting a shrink foil hood over a stack and shrinking it on said stack - Google Patents

Apparatus for fitting a shrink foil hood over a stack and shrinking it on said stack Download PDF

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Publication number
EP0250647B1
EP0250647B1 EP86117386A EP86117386A EP0250647B1 EP 0250647 B1 EP0250647 B1 EP 0250647B1 EP 86117386 A EP86117386 A EP 86117386A EP 86117386 A EP86117386 A EP 86117386A EP 0250647 B1 EP0250647 B1 EP 0250647B1
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EP
European Patent Office
Prior art keywords
stack
shrinking
frame
gripping elements
respect
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP86117386A
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German (de)
French (fr)
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EP0250647B2 (en
EP0250647A1 (en
Inventor
Richard Birkenfeld
Olaf Dr. Dipl.-Ing. Klüpfel
Manfred Dipl.-Ing. Grünert
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Maschinenfabrik Moellers GmbH
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Maschinenfabrik Moellers GmbH
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Application filed by Maschinenfabrik Moellers GmbH filed Critical Maschinenfabrik Moellers GmbH
Priority to AT86117386T priority Critical patent/ATE46886T1/en
Publication of EP0250647A1 publication Critical patent/EP0250647A1/en
Application granted granted Critical
Publication of EP0250647B1 publication Critical patent/EP0250647B1/en
Publication of EP0250647B2 publication Critical patent/EP0250647B2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/13—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the preformed tubular webs being supplied in a flattened state
    • B65B9/135—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the preformed tubular webs being supplied in a flattened state for palletised loads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B53/00—Shrinking wrappers, containers, or container covers during or after packaging
    • B65B53/02—Shrinking wrappers, containers, or container covers during or after packaging by heat
    • B65B53/06—Shrinking wrappers, containers, or container covers during or after packaging by heat supplied by gases, e.g. hot-air jets
    • B65B53/063—Tunnels

Definitions

  • the invention relates to a device for covering and shrinking a shrink film hood over or to a stack formed from a number of packaging objects with a height-movable frame, on which shrinking devices are arranged in the upper area and gripping elements in the lower area for gripping and pulling down the lower edge of the shrink film , and with a lifting device for the stack, by means of which the stack can be raised by a conveyor which transports it into and out of the device for shrinking the lower edge of the shrink film hood.
  • EP-A 133 462 a device which has a combined hood covering and shrinking device, but in which the hood covering device is arranged spatially separate from the shrinking device, i.e. the shrinking devices and the gripping elements for gripping and covering the shrink film are not arranged on a common height-movable frame.
  • the object of the invention is to provide a solution by means of which a generic combination device can be improved such that the overall height of the combination device can be reduced.
  • this object is achieved according to the invention in that the gripping elements and the shrinking devices are designed to be movable relative to one another in the vertical direction on the vertically movable frame.
  • the shrinking devices and the gripping elements between the stack and the devices located above them take up relatively little space and that in the lower position of the vertically movable frame the gripping elements for covering the lower edge of the shrink film hood can be moved further down from the effective range of the shrinking devices or have been moved before the downward movement of the height-adjustable frame, so that on the one hand the gripping elements can detach from the shrink film hood and the other while Commissioning of the shrinking devices for effecting a good shrinking after prior lifting of the stack by means of the lifting device provided according to the invention are not in the way, the same space for lifting the stack is available, which is required in the lowered position of the stack for securely grasping the lower edge of the shrink film hood by means of the gripping elements arranged on the vertically movable frame.
  • the gripping elements can be raised and lowered within limits by means of at least one pneumatic or hydraulic drive cylinder along corresponding vertical guides on the common frame.
  • the heat shield has two sliding plates which are horizontally displaceable from the laterally inactive position into the abutting shielding position. As can be seen, this means that practically no additional height is required.
  • a stack of goods 3 is arranged within a frame 1 on a carriageway 2.
  • a roller 4 is mounted in the frame, on which a plastic tube made of heat-shrinkable material is wound with gussets.
  • the flat-lying hose 5 is fed via deflection rollers 6 and drive rollers 7 to a pre-spreading device, which consists of guide elements 8 arranged vertically movable in the area of the folded hose edges, below which a separating device 9 and a welding device 10 are arranged.
  • a pre-spreading device which consists of guide elements 8 arranged vertically movable in the area of the folded hose edges, below which a separating device 9 and a welding device 10 are arranged.
  • two roof conveyor-type double conveyor belts 11 are arranged on both sides of the frame 1, the upper receiving ends being located directly below the guide elements 8 in their lowered position.
  • the double conveyor belts 11 are arranged so as to be pivotable about upper reversing wheel axes 19 of the lower conveyor belts, in such a way that the distance between their discharge ends can be changed to adapt to different cross-sectional dimensions of the stack of goods 3.
  • Each double conveyor belt 11 is assigned a pivot lever 12 which is arranged approximately parallel to the assigned double conveyor belt and can be pivoted about a lower fixed point 13 by means of an actuating device 14.
  • endless chains 15 are mounted, to which a frame 16 which is movable by means of the chains 15 is fastened and which in its four corner areas each has a vertical guide 17, along each of which a gripping element 18 by means of a drive cylinder 20 is vertically movable between two stops 21.
  • a circumferential rectangular shrinking burner 22 Arranged above the vertical guides 17 on the frame 16 is a circumferential rectangular shrinking burner 22 which can direct hot gases in the direction of the stack 3 of goods in a manner not shown in any more detail.
  • a heat shield 23 is arranged below the double conveyor belts 11, which essentially consists of two sliding plates 24, which can be moved horizontally from the laterally inactive position according to FIG. 1 to the closed position according to FIG. 2.
  • a lifting device 25 is arranged between the track 2 formed by chain conveyors, by means of which the stack of goods 3 can be moved from the position resting on the track 2 according to FIG. 1 to the raised position according to FIG. 2.
  • the operation of the device is as follows: the hose 5 is opened via the guide elements 8 and the double conveyor belts 11 and after the lower end of the hose has run out of the double conveyor belts 1 a little, the gripping elements 18 which are pivoted inwards are inserted into the hose and moved outwards so that the hose is stretched tight between the gripping elements 18 located at the four corners of the stack of goods, as shown in FIG. 1. Then the double conveyor belts 11 and the transport chains 15 are actuated and the tube is pulled a little bit downwards over the stack of goods 3. Then the guide elements 8 are moved upwards and the welding and separating devices 9 and 10 are actuated.
  • the double conveyor belts 11 are put into operation again and at the same time the pivoting levers 12 are pivoted downward, as a result of which the folded tube edges are pressed or pulled out of the receiving ends of the double conveyor belts.
  • the frame 16 with the gripping elements 17 and the shrinking frame 22 is moved further downward until the stack of goods is completely covered by the hose hood now formed.
  • the material stack 3 is raised by means of the lifting device 25 and the gripping fingers 18 are moved downwards along the vertical guides 17, as shown in FIG. 2, in such a way that the gripping elements 18 are pulled out of the hose , the lower edge 26 of the tubular hood over a piece of the lower end of 3 g utstapels suspended.
  • the two sliding plates 24 of the heat shield 23 are moved together, as shown in FIG. 2, so that when the shrinking torch is subsequently actuated, rising heat does not overlap the section of the hose 5 before being pulled over the stack can unfavorably soften.
  • the shrinking torch 22 is switched on, which in the position according to FIG. 2 is directed so that the lower edge 26 of the hose is blown against the underside of the stack and at the same time shrunk onto it, as shown in dotted lines in FIG. 2.
  • the lifting device 25 is then actuated to lower the stack 3, so that the folded-over lower edge 26 is fixed between the stack and the carriageway 2.
  • the frame 16 is moved upward again, so that the shrinking torch 22 shrinks the side surfaces of the hose 5 onto the stack.
  • the drive cylinder 20 is actuated to move the gripping elements 18 upward, so that the frame is again in the starting position for a new work cycle, as shown in FIG. 1.
  • the gripping devices arranged above the vertically movable frame for opening and holding the hose open during the pulling-over movement of the hose could also be designed differently or be omitted entirely if one can accept the appropriate stacks of material that the hose then pulls over the stack above its upper one Edges grinds.
  • other shrinking devices such as infrared shrinking devices could also be arranged on the vertically movable frame instead of a shrinking burner and the like. More.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
  • Specific Conveyance Elements (AREA)
  • Coating Apparatus (AREA)
  • Stacking Of Articles And Auxiliary Devices (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

An arrangement for sliding and shrinking a hood of shrinking foil over and onto a stack formed by a number of packaging objects. The arrangement includes a vertically movable frame with shrinking devices provided in the upper region of the frame and gripping elements for grasping and pulling down the lower edge of the shrinking foil. A lifting device arranged centrically underneath the stack serves to raise the stack from a conveying device which transports the stack into and out of the arrangement according to the invention. The lifting device raises the stack so that the lower edge of the hood of shrinking foil can be shrunk onto the stack up to the region of the conveying device. Subsequently, the lifting device is lowered. The vertical distance between the gripping elements and the shrinking devices is adjustable.

Description

Die Erfindung betrifft eine Vorrichtung zum Überziehen und Anschrumpfen einer Schrumpffolienhaube über bzw. an einen aus einer Anzahl von Verpackungsgegenständen gebildeten Stapel mit einem höhenbeweglichen Rahmen, an dem im oberen Bereich Schrumpfeinrichtungen und im unteren Bereich Greifelemente zum Erfassen und Abwärtsziehen des unteren Randes der Schrumpffolie angeordnet sind, und mit einer Hubeinrichtung für den Stapel, mittels welcher der Stapel von einen diesen in die und aus der Vorrichtung transportierenden Förderer zum Unterschrumpfen des unteren Randes der Schrumpffolienhaube anhebbar ist.The invention relates to a device for covering and shrinking a shrink film hood over or to a stack formed from a number of packaging objects with a height-movable frame, on which shrinking devices are arranged in the upper area and gripping elements in the lower area for gripping and pulling down the lower edge of the shrink film , and with a lifting device for the stack, by means of which the stack can be raised by a conveyor which transports it into and out of the device for shrinking the lower edge of the shrink film hood.

Aus der EP-A 88 424 ist eine gattungsgemäße Kombinationsvorrichtung mit einem höhenbeweglichen Rahmen bekannt, an dem im oberen Bereich Schrumpfeinrichtungen und im unteren Bereich Greifelemente für die Schrumpffolie angeordnet sind, wobei zusätzlich eine Hubeinrichtung für den Stapel vorgesehen ist, mittels derer der Stapel zum Unterschrumpfen der Schrumpffolienhaube anhebbar ist. Nachteilig bei dieser Vorrichtung ist jedoch, daß die Anordnung der Schrumpf- sowie der Greifeinrichtungen an einem gemeinsamen, höhenbeweglichen Rahmen einen unerwünscht großen Raumbedarf verursacht, da die Schrumpf- und Greifeinrichtungen entsprechend weit voneinander entfernt am gemeinsamen Rahmen angeordnet sein müssen, um einen einwandfreien Schrumpfbetrieb zu ermöglichen, d.h. um einen ausreichend großen Bestrahlungsraum um die Schrumpfeinrichtung herum freizulassen. Dies erfordert entweder für die obere Stellung des Rahmens beim Überziehen der Haube eine entsprechend große Bauhöhe der Vorrichtung nach oben oder, daß zum Herausgleiten der Greifelemente aus der über den Stapel gezogenen Schrumpffolie der Rahmen zunächst sehr weit nach unten in den Bereich unterhalb des Stapels bei hochgestelltem Stapel und anschließend zum Starten des Schrumpfvorganges durch Aktivierung der Schrumpfeinrichtungen wieder ein Stück nach oben verfahren werden muß, was den Funktionsablauf entsprechend verzögert und somit den Durchsatz der Vorrichtung verringert.From EP-A 88 424 a generic combination device with a vertically movable frame is known, on which shrinking devices are arranged in the upper area and gripping elements for the shrink film are arranged in the lower area, wherein additionally a lifting device is provided for the stack, by means of which the stack for shrinking under the shrink film hood can be raised. A disadvantage of this device, however, is that the arrangement of the shrinking and gripping devices on a common, vertically movable frame causes an undesirably large space requirement, since the shrinking and gripping devices must be arranged correspondingly far apart from one another on the common frame in order to ensure proper shrinking operation enable, ie to leave a sufficiently large irradiation space around the shrinking device. This requires either a correspondingly large overall height of the device for the upper position of the frame when the hood is pulled over, or that for the sliding elements of the gripping elements out of the shrink film drawn over the stack, the frame is initially very far down into the area below the stack with the superscript Stack and then to start the shrinking process by activating the shrinking devices must be moved up a bit again, which delays the functional sequence accordingly and thus reduces the throughput of the device.

Ferner ist aus der EP-A 133 462 eine Vorrichtung bekannt, die eine kombinierte Haubenüberzieh-und Schrumpfeinrichtung aufweist, bei der aber die Haubenüberzieheinrichtung räumlich getrennt von der Schrumpfeinrichtung angeordnet ist, d.h. die Schrumpfeinrichtungen und die Greifelemente zum Erfassen und überziehen der Schrumpffolie sind nicht an einem gemeinsamen höhenbeweglichen Rahmen angeordnet.Furthermore, from EP-A 133 462 a device is known which has a combined hood covering and shrinking device, but in which the hood covering device is arranged spatially separate from the shrinking device, i.e. the shrinking devices and the gripping elements for gripping and covering the shrink film are not arranged on a common height-movable frame.

Aufgabe der Erfindung ist die Schaffung einer Lösung, mittels welcher eine gattungsgemäße Kombinationsvorrichtung derart verbessert werden kann, daß die Bauhöhe der Kombinationsvorrichtung verringerbar ist.The object of the invention is to provide a solution by means of which a generic combination device can be improved such that the overall height of the combination device can be reduced.

Bei einer gattungsgemäßen Vorrichtung der eingangs bezeichneten Art wird diese Aufgabe erfindungsgemäß dadurch gelöst, daß die Greifelemente und die Schrumpfeinrichtungen an dem höhenbeweglichen Rahmen in vertikaler Richtung relativ zueinander beweglich ausgebildet sind.In a generic device of the type described in the introduction, this object is achieved according to the invention in that the gripping elements and the shrinking devices are designed to be movable relative to one another in the vertical direction on the vertically movable frame.

Aufgrund dieser Ausgestaltung wird erreicht, daß in oberster Stellung des höhenbeweglichen Rahmens die Schrumpfeinrichtungen und die Greifelemente zwischen dem Stapel und darüber befindlichen Einrichtungen, wie Greifereinrichtungen zum Öffnen und Offenhalten des Schrumpfschlauches während des Überziehvorganges relativ wenig Raum beanspruchen und daß in unten befindlicher Stellung des höhenbeweglichen Rahmens die Greifelemente zum Überziehen des unteren Randes der Schrumpffolienhaube aus dem Wirkungsbereich der Schrumpfeinrichtungen weiter abwärts bewegt werden können oder schon vor der Abwärtsbewegung des höhenbeweglichen Rahmens bewegt worden sind, so daß einerseits die Greifelemente sich nach dem Überziehen der Schrumpffolienhaube von dieser lösen können und zum anderen beim Inbetriebsetzen der Schrumpfeinrichtungen zur Bewirkung eines guten Unterschrumpfs nach vorangegangenem Anheben des Stapels mittels der erfindungsgemäß vorgesehenen Hubeinrichtung nicht im Wege stehen, wobei der gleiche Raum zum Anheben des Stapels zur Verfügung steht, der in abgesenkter Stellung des Stapels für das sichere Erfassen des unteren Randes der Schrumpffolienhaube mittels der am höhenbeweglichen Rahmen angeordneten Greifelemente benötigt wird.Because of this configuration it is achieved that in the uppermost position of the vertically movable frame, the shrinking devices and the gripping elements between the stack and the devices located above them, such as gripper devices for opening and keeping open the shrink tube during the pulling-up process, take up relatively little space and that in the lower position of the vertically movable frame the gripping elements for covering the lower edge of the shrink film hood can be moved further down from the effective range of the shrinking devices or have been moved before the downward movement of the height-adjustable frame, so that on the one hand the gripping elements can detach from the shrink film hood and the other while Commissioning of the shrinking devices for effecting a good shrinking after prior lifting of the stack by means of the lifting device provided according to the invention are not in the way, the same space for lifting the stack is available, which is required in the lowered position of the stack for securely grasping the lower edge of the shrink film hood by means of the gripping elements arranged on the vertically movable frame.

Eine besonders einfache Ausbildung ergibt sich dabei, wenn die Greifelemente gegenüber dem höhenbeweglichen Rahmen vertikal beweglich ausgebildet sind.A particularly simple design results if the gripping elements are designed to be vertically movable relative to the height-movable frame.

Zweckmäßig kann man dabei die Greifelemente mittels mindestens eines pneumatischen oder hydraulischen Antriebszylinders längs entsprechender vertikaler Führungen an dem gemeinsamen Rahmen in Grenzen heb- und senkbar ausgestalten.Expediently, the gripping elements can be raised and lowered within limits by means of at least one pneumatic or hydraulic drive cylinder along corresponding vertical guides on the common frame.

Um bei der erfindungsgemäß ermöglichten relativ niedrigen Bauhöhe der Gesamtvorrichtung zu verhindern, daß die beim Betätigen der Schrumpfeinrichtungen aufsteigende Wärme die oberhalb des Stapels befindliche Schrumpffolie für den nächsten Überziehvorgang vorzeitig erweicht, ist es in Weiterbildung der Erfindung zweckmäßig, zwischen höhenstationären oberen Greifeinrichtungen zum Öffnen und Offenhalten des Schlauches beim Überziehen über den Stapel und den in seiner obersten Stellung befindlichen höhenbeweglichen Rahmen einer Wärmeabschirmung anzuordnen, wie dies grundsätzlich bei einfachen Schrumpfeinrichtungen mittels eines Kaltluftstromes schon bekannt ist (DE-GM 85 13 892).In order to prevent, with the relatively low overall height of the overall device made possible according to the invention, that the heat rising when the shrinking devices are actuated prematurely softens the shrink film located above the stack for the next covering process, it is expedient in a further development of the invention to open and hold open between upper stationary gripping devices to arrange the hose when pulling it over the stack and the height-adjustable frame of a heat shield in its uppermost position, as is already known in principle for simple shrinking devices by means of a cold air flow (DE-GM 85 13 892).

Besonders vorteilhaft ist es dabei, wenn die Wärmeabschirmung zwei Schiebeplatten aufweist, die aus seitlich unwirksamer Stellung in aneinanderstoßende Abschirmstellung horizontal verschiebbar sind. Wie erkennbar ist, wird dadurch praktisch keine zusätzliche Bauhöhe benötigt.It is particularly advantageous if the heat shield has two sliding plates which are horizontally displaceable from the laterally inactive position into the abutting shielding position. As can be seen, this means that practically no additional height is required.

Die Erfindung ist nachstehend anhand der Zeichnung beispielsweise näher erläutert. Diese zeigt in:

  • Fig. 1 eine Vorrichtung gemäß der Erfindung in Seitenansicht mit in oberster Stellung befindlichem höhenbeweglichen Rahmen und abgesenktem Stapel sowie Wärmeabschirmung in unwirksamer Stellung,
  • Fig. 2 eine Vorrichtung gemäß Fig. 1 mit in unterster Stellung befindlichem höhenbeweglichen Rahmen und in unterster Stellung befindlichen Greifelementen und mittels Hubeinrichtung angehobenem Stapel sowie in Abschirmstellung befindlicher Wärmeabschirmung und in
  • Fig. 3 ein vergrößertes Detail A aus Fig. 1 mit Betätigungseinrichtung für die Greifelemente.
The invention is explained below with reference to the drawing, for example. This shows in:
  • Fig. 1 shows a device according to the invention in side view with the vertically movable frame in the uppermost position and the stack lowered as well as heat shield in ineffective position,
  • Fig. 2 shows a device according to FIG. 1 with the vertically movable frame in the lowest position and the gripping elements in the lowest position and the stack raised by means of the lifting device and in the shielding position of the heat shield and in
  • Fig. 3 is an enlarged detail A from Fig. 1 with actuating device for the gripping elements.

Bei der in der Zeichnung wiedergegebenen Vorrichtung ist innerhalb eines Gestells 1 auf einer Fahrbahn 2 ein Gutstapel 3 angeordnet. Im Gestell ist eine Rolle 4 gelagert, auf der ein Kunststoffschlauch aus wärmeschrumpffähigem Material mit Seitenfalten aufgewickelt ist. Der flachliegende Schlauch 5 wird über Umlenkrollen 6 und Antriebsrollen 7 einer Vorspreizeinrichtung zugeführt, die aus im Bereich der gefalteten Schlauchränder vertikal beweglich angeordneten Leitelementen 8 besteht, unterhalb welcher eine Trenneinrichtung 9 sowie eine Schweißeinrichtung 10 angeordnet sind. Unterhalb der Leitelemente 8 sind auf beiden Seiten des Gestells 1 zei dachförmig angeordnete Doppelförderbänder 11 angeordnet, wobie die oberen Aufnahmeenden unmittelbar unterhalb der Leitelemente 8 in deren abgesenkter Stellung befindlich sind. Die Doppelförderbänder 11 sind um obere Umkehrräderachsen 19 der unteren Förderbänder schwenkbar angeordnet, derart, daß der Abstand ihrer Abgabeenden zur Anpassung an verschiedene Querschnittsabmessungen des Gutstapels 3 veränderbar ist. Jedem Doppelförderband 11 ist ein Schwenkhebel 12 zugeordnet, der etwa parallel zu dem zugeordneten Doppelförderband angeordnet ist und um einen unteren Festpunkt 13 mittels einer Betätigungseinrichtung 14 schwenkbar ist.In the device shown in the drawing, a stack of goods 3 is arranged within a frame 1 on a carriageway 2. A roller 4 is mounted in the frame, on which a plastic tube made of heat-shrinkable material is wound with gussets. The flat-lying hose 5 is fed via deflection rollers 6 and drive rollers 7 to a pre-spreading device, which consists of guide elements 8 arranged vertically movable in the area of the folded hose edges, below which a separating device 9 and a welding device 10 are arranged. Below the guide elements 8, two roof conveyor-type double conveyor belts 11 are arranged on both sides of the frame 1, the upper receiving ends being located directly below the guide elements 8 in their lowered position. The double conveyor belts 11 are arranged so as to be pivotable about upper reversing wheel axes 19 of the lower conveyor belts, in such a way that the distance between their discharge ends can be changed to adapt to different cross-sectional dimensions of the stack of goods 3. Each double conveyor belt 11 is assigned a pivot lever 12 which is arranged approximately parallel to the assigned double conveyor belt and can be pivoted about a lower fixed point 13 by means of an actuating device 14.

Im Gestell 1 sind in der Nähe der vier Ecken desselben endlos umlaufende Ketten 15 gelagert, an denen ein mittels der Ketten 15 höhenbeweglicher Rahmen 16 befestigt ist, der in seinen vier Eckbereichen jeweils eine Vertikalführung 17 aufweist, längs welcher je ein Greifelement 18 mittels eines Antriebszylinder 20 zwischen zwei Anschlägen 21 vertikal beweglich ist.In the frame 1, in the vicinity of the four corners of the same, endless chains 15 are mounted, to which a frame 16 which is movable by means of the chains 15 is fastened and which in its four corner areas each has a vertical guide 17, along each of which a gripping element 18 by means of a drive cylinder 20 is vertically movable between two stops 21.

Oberhalb der Vertikalführungen 17 ist am Rahmen 16 ein ringsum verlaufender rechteckiger Schrumpfbrenner 22 angeordnet, der in nicht näher dargestellter Weise Heißgase in Richtung auf den Gutstapel 3 richten kann.Arranged above the vertical guides 17 on the frame 16 is a circumferential rectangular shrinking burner 22 which can direct hot gases in the direction of the stack 3 of goods in a manner not shown in any more detail.

Unterhalb der Doppelförderbänder 11 ist eine Wärmeabschirmung 23 angeordnet, welche im wesentliche aus zwei Schiebeplatten 24 besteht, welche aus seitlich unwirksamer Stellung gemäß Fig. 1 in geschlossene Stellung gemäß Fig. 2 horizontal verschoben werden können. Schließlich ist zwischen der von Kettenförderern gebildeten Fahrbahn 2 eine Hubeinrichtung 25 angeordnet, mittels welcher der Gutstapel 3 aus der auf der Fahrbahen 2 ruhenden Stellung gemäß Fig. 1 in angehobene Stellung gemäß Fig. 2 verbracht werden kann.A heat shield 23 is arranged below the double conveyor belts 11, which essentially consists of two sliding plates 24, which can be moved horizontally from the laterally inactive position according to FIG. 1 to the closed position according to FIG. 2. Finally, a lifting device 25 is arranged between the track 2 formed by chain conveyors, by means of which the stack of goods 3 can be moved from the position resting on the track 2 according to FIG. 1 to the raised position according to FIG. 2.

Die Wirkungsweise der Vorrichtung ist wie folgt: Der Schlauch 5 wird über die Leitelemente 8 und die Doppelförderbänder 11 geöffnet und nachdem das untere Ende des Schlauches ein Stück aus den Doppelförderbändern 1 herausgelaufen ist, werden die ein Stück einwärts verschwenkten Greifelemente 18 in den Schlauch eingefahren und nach außen bewegt, so daß der Schlauch stramm zwischen den an den vier Ecken des Gutstapels befindlichen Greifelementen 18 aufgespannt ist, wie dies Fig. 1 zeigt. Darauf werden die Doppelförderbänder 11 und die Transportketten 15 betätigt und der Schlauch wird über den Gutstapel 3 ein Stück ab wärts gezogen. Dann werden die Leitelemente 8 nach oben gefahren und die Schweiß- und Trenneinrichtungen 9 und 10 werden betätigt. Anschließend werden die Doppelförderbänder 11 wieder in Betrieb gesetzt und gleichzeitig die Schwenkhebel 12 abwarts geschwenkt, wodurch die gefalteten Schlauchränder aus den Aufnahmeenden der Doppelförderbänder herausgedrückt bzw. -gezogen werden. Gleichzeitig wird auch der Rahmen 16 mit den Greifelementen 17 und dem Schrumpfrahmen 22 weiter abwärts bewegt, bis der Gutstapel vollständig von der jetzt gebildeten Schlauchhaube überzogen ist.The operation of the device is as follows: the hose 5 is opened via the guide elements 8 and the double conveyor belts 11 and after the lower end of the hose has run out of the double conveyor belts 1 a little, the gripping elements 18 which are pivoted inwards are inserted into the hose and moved outwards so that the hose is stretched tight between the gripping elements 18 located at the four corners of the stack of goods, as shown in FIG. 1. Then the double conveyor belts 11 and the transport chains 15 are actuated and the tube is pulled a little bit downwards over the stack of goods 3. Then the guide elements 8 are moved upwards and the welding and separating devices 9 and 10 are actuated. Subsequently, the double conveyor belts 11 are put into operation again and at the same time the pivoting levers 12 are pivoted downward, as a result of which the folded tube edges are pressed or pulled out of the receiving ends of the double conveyor belts. At the same time, the frame 16 with the gripping elements 17 and the shrinking frame 22 is moved further downward until the stack of goods is completely covered by the hose hood now formed.

Während des Abwärtsfahrens des Rahmens 16 oder auch schon vorher wird der Gutstapel 3 mittels der Hubeinrichtung 25 angehoben und werden die Greiffinger 18 längs der Vertikalführungen 17 abwärts bewegt, so wie dies Fig. 2 zeigt, derart, daß die Greifelemente 18 aus dem Schlauch herausgezogen werden, wobei der untere Rand 26 der Schlauchhaube ein Stück über das untere Ende des gutstapels 3 herabhängt. Nach dem vollständigen Überziehen des Schlauches über den Stapel werden die beiden Schiebeplatten 24 der Wärmeabschirmung 23 zusammengefahren, wie dies Fig. 2 zeigt, so daß bei der nachfolgenden Betätigung des Schrumpfbrenners aufsteigende Wärme den oberhalb befindlichen Abschnitt des Schlauches 5 vor dem Überziehen über den Stapel nicht in unvorteilhafter Weise erweichen kann.During the downward movement of the frame 16 or even beforehand, the material stack 3 is raised by means of the lifting device 25 and the gripping fingers 18 are moved downwards along the vertical guides 17, as shown in FIG. 2, in such a way that the gripping elements 18 are pulled out of the hose , the lower edge 26 of the tubular hood over a piece of the lower end of 3 g utstapels suspended. After the hose has been completely pulled over the stack, the two sliding plates 24 of the heat shield 23 are moved together, as shown in FIG. 2, so that when the shrinking torch is subsequently actuated, rising heat does not overlap the section of the hose 5 before being pulled over the stack can unfavorably soften.

Daraufhin wird der Schrumpfbrenner 22 eingeschaltet, der in der Stellung gemäß Fig. 2 so gerichtet ist, daß der untere Rand 26 des Schlauches gegen die Unterseite des Stapels geblasen und gleichzeitig an diese angeschrumpft wird, wie dies punktiert in Fig. 2 dargestellt ist. Daraufhin wird die Hubeinrichtung 25 zum Absenken des Stapels 3 betätigt, so daß der umgeschlagene untere Rand 26 zwischen Stapel und Fahrbahn 2 festgelegt ist. Gleichzeitig mit bzw. kurz nach dem Absenken des Gutstapels 3 wird der Rahmen 16 wieder aufwärtsbewegt, so daß der Schrumpfbrenner 22 die Seitenflächen des Schlauches 5 an den Stapel anschrumpft. Am Ende der Aufwärtsbewegung des Rahmens 16 wird der Antriebszylinder 20 zum Aufwärtsbewegen der Greifelemente 18 betätigt, so daß der Rahmen wieder in Ausgangsposition für einen neuen Arbeitszyklus ist, wie dies Fig. 1 zeigt. Je nach Art des Gutstapels 3 kann es auch empfehlenswert sei, nach dem Unterschrumpfen und Festlegen des unteren Randes 26 des Schlauches den Rahmen 16 zunächst ohne arbeitenden Schrumpfbrenner wieder nach oben zu fahren und dann erneut unter Inbetriebsetzen des Schrumpfbrenners 22 abzusenken, derart, daß das Schrumpfen von oben nach unten fortschreitet, um derart innerhalb des Stapels befindliche Luft möglichst weitgehend entweichen zu lassen.Thereupon, the shrinking torch 22 is switched on, which in the position according to FIG. 2 is directed so that the lower edge 26 of the hose is blown against the underside of the stack and at the same time shrunk onto it, as shown in dotted lines in FIG. 2. The lifting device 25 is then actuated to lower the stack 3, so that the folded-over lower edge 26 is fixed between the stack and the carriageway 2. Simultaneously with or shortly after the stack of goods 3 has been lowered, the frame 16 is moved upward again, so that the shrinking torch 22 shrinks the side surfaces of the hose 5 onto the stack. At the end of the upward movement of the frame 16, the drive cylinder 20 is actuated to move the gripping elements 18 upward, so that the frame is again in the starting position for a new work cycle, as shown in FIG. 1. Depending on the type of material stack 3, it may also be advisable, after shrinking and fixing the lower edge 26 of the hose, to first move the frame 16 upwards without a working shrinking torch and then to lower it again while starting the shrinking torch 22 in such a way that the shrinking progresses from top to bottom so as to be within the stack to let sensitive air escape as far as possible.

Natürlich sind zahlreiche Abänderungen der beschriebenen Vorrichtung möglich, ohne den Grundgedanken der Erfindung zu verlassen. So könnten die oberhalb des höhenbeweglichen Rahmens angeordneten Greifeinrichtungen zum Öffnen und Offenhalten des Schlauches während der Überziehbewegung des Schlauches auch anders gestaltet sein oder ganz entfallen, wenn man bei entsprechenden Gutstapeln in Kauf nehmen kann, daß dann der Schlauch beim Überziehen über den Stapel über dessen obere Kanten schleift. Auch könnten natürlich anstelle eines Schrumpfbrenners andere Schrumpfeinrichtungen wie Infrarotschrumpfeinrichtungen am höhenbeweglichen Rahmen angeordnet sein und dgl. mehr.Of course, numerous modifications of the described device are possible without leaving the basic idea of the invention. Thus, the gripping devices arranged above the vertically movable frame for opening and holding the hose open during the pulling-over movement of the hose could also be designed differently or be omitted entirely if one can accept the appropriate stacks of material that the hose then pulls over the stack above its upper one Edges grinds. Of course, other shrinking devices such as infrared shrinking devices could also be arranged on the vertically movable frame instead of a shrinking burner and the like. More.

Claims (5)

1. Apparatus for fitting a shrink foil cover (5) over a stack (3) formed from a number of packaging items, and shrinking the cover on to the stack, comprising a frame (16) which is movable in respect of height and which carries in the upper region shrinking means (22) and in the lower region gripping elements (18) for engaging and downwardly pulling the lower edge (26) of the shrink foil (5), and further comprising a lift means (25) for the stack (3), by means of which the stack (3) can be lifted from a conveyor (2) transporting the stack into and out of the apparatus, for shrinking the lower edge (26) of the shrink foil cover (5) under the stack, characterised in that the gripping elements (18) and the shrinking means (22) are arranged movably relative to each other in a vertical direction on the frame (16) which is movable in respect of height.
2. Apparatus according to claim 1 characterised in that the gripping elements (18) are designed to be movable vertically with respect to the frame (16) which is movable in respect of height.
3. Apparatus according to claim 2 characterised in that the gripping elements (18) can be raised and lowered within limits along suitable vertical guides (17) on the common frame (16) by means of at least one pneumatic or hydraulic actuating cylinder (20).
4. Apparatus according to claim 1 or one of the -following claims characterised in that a heat shield means (23) is arranged between the upper gripping means (11), which are stationary in respect of height, for opening and keeping open the tube (5) when it is fitted over the stack (3), and the frame (16) which is movable in respect of height, when disposed in its uppermost position.
5. Apparatus according to claim 4 characterised in that the heat shield means (23) comprises two sliding plates (24) which are horizontally slidable from a laterally inoperative position into a shielding position of bearing against each other.
EP86117386A 1986-06-25 1986-12-13 Apparatus for fitting a shrink foil hood over a stack and shrinking it on said stack Expired - Lifetime EP0250647B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86117386T ATE46886T1 (en) 1986-06-25 1986-12-13 DEVICE FOR COVERING AND SHRINKING A SHRINK FILM HOOD OVER RESPECTIVELY. TO A STACK.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3621297 1986-06-25
DE19863621297 DE3621297A1 (en) 1986-06-25 1986-06-25 DEVICE FOR PULLING ON AND SHRINKING A SHRINK FILM HOOD OVER OR ON A STACK.

Publications (3)

Publication Number Publication Date
EP0250647A1 EP0250647A1 (en) 1988-01-07
EP0250647B1 true EP0250647B1 (en) 1989-10-04
EP0250647B2 EP0250647B2 (en) 1995-05-10

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EP86117386A Expired - Lifetime EP0250647B2 (en) 1986-06-25 1986-12-13 Apparatus for fitting a shrink foil hood over a stack and shrinking it on said stack

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US (1) US4724658A (en)
EP (1) EP0250647B2 (en)
JP (1) JPS6312433A (en)
AT (1) ATE46886T1 (en)
DE (2) DE3621297A1 (en)
ES (1) ES2011447T5 (en)
SU (1) SU1625328A3 (en)

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DE102016212436B4 (en) * 2016-07-07 2018-07-26 Signode Industrial Group Llc Packaging process and hood stretcher
CN109896075B (en) * 2019-04-08 2020-12-04 湖州师范学院求真学院 Automatic adhesion equipment for sign post protection cloth of road traffic sign board
DE102019216346A1 (en) * 2019-10-23 2021-04-29 Signode Industrial Group Llc Method and device for packaging a stack of goods in a tubular stretch film
CN110745306A (en) * 2019-11-22 2020-02-04 安徽永锋智能包装科技有限公司 Refrigerator packing bottom-closing equipment
CN110834771A (en) * 2019-11-22 2020-02-25 安徽永锋智能包装科技有限公司 Bottom-closing method for transparent packaging bag of refrigerator
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Also Published As

Publication number Publication date
ATE46886T1 (en) 1989-10-15
EP0250647B2 (en) 1995-05-10
ES2011447T5 (en) 1995-08-16
SU1625328A3 (en) 1991-01-30
DE3621297C2 (en) 1992-05-14
US4724658A (en) 1988-02-16
DE3666025D1 (en) 1989-11-09
JPS6312433A (en) 1988-01-19
EP0250647A1 (en) 1988-01-07
ES2011447B3 (en) 1990-01-16
DE3621297A1 (en) 1988-01-14

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