EP0205772B1 - Walking beam transport system - Google Patents

Walking beam transport system Download PDF

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Publication number
EP0205772B1
EP0205772B1 EP86103957A EP86103957A EP0205772B1 EP 0205772 B1 EP0205772 B1 EP 0205772B1 EP 86103957 A EP86103957 A EP 86103957A EP 86103957 A EP86103957 A EP 86103957A EP 0205772 B1 EP0205772 B1 EP 0205772B1
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EP
European Patent Office
Prior art keywords
walking beam
stop
supporting structure
conveyor according
displaceable
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Expired
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EP86103957A
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German (de)
French (fr)
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EP0205772A1 (en
Inventor
Manfred Dipl.-Ing. Mertens
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ASEA BROWN BOVERI AKTIENGESELLSCHAFT
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Asea Brown Boveri AG Germany
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Publication of EP0205772A1 publication Critical patent/EP0205772A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F27B9/2407—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace)

Definitions

  • the invention relates to a walking beam conveyor, for a heating device, in particular for an induction heater, for conveying workpieces following one another.
  • the material to be heated is pushed through the induction coil in the form of slabs, billets or blocks of iron, iron alloys or non-ferrous metals and heated to the forging temperature.
  • the individual blocks stick to the touching end faces, which leads to malfunctions.
  • the reason for this bonding is a sintering of the pressed metal block ends against each other.
  • This sintering process is favored by the heating to the forging temperature, by the contact pressure when bumping, by magnetic forces of the induction coil, by thermal expansion and by the length of time during which the temperature and pressure act.
  • Block breaking devices are known for this. Blockbreakers, however, require considerable costs and space. In addition, they lead to interruptions in the working rhythm and to problems in keeping the blocks that have already been heated warm before further processing
  • the workpieces are moved step by step by repeated lifting, advancing and lowering.
  • inductive heaters particularly when these are operated at high power concentration, considerable magnetic forces occur which bring the blocks closer together, which ultimately leads to sticking together again.
  • the gaps between two successive blocks can be closed by the temperature expansion of the blocks during the heating. Glued blocks must also be separated from each other here, which can be done by means of a block breaking device, as described.
  • the object of the invention is to find a way out here and to reliably avoid sticking (caking, sintering or welding) of the blocks.
  • a walking beam conveyor of the type mentioned at the beginning is to be specified, which has a continuous walking beam.
  • a walking beam conveyor of the type mentioned in that it has at least two sections with different conveying strokes.
  • the conveyor stroke length of the downstream section is greater than that of the previous section.
  • at least two support structures for the workpiece transport are arranged separately from one another on the walking beam. At least one of these support structures is arranged to be displaceable relative to the walking beam in the longitudinal direction thereof.
  • the walking beam executes the basic movement, which consists of the conveying stroke, lowering, return stroke and lifting.
  • the supporting structures firmly connected to the walking beam transmit the respective conveying stroke of this basic movement to the workpiece.
  • a displaceable support structure can be moved relative to the walking beam, so that it can be used to transmit a conveying stroke to the workpiece, which differs from the conveying stroke of the walking beam.
  • This solution has the particular advantage that corresponding fixed and displaceable support structures can usually be retrofitted on walking beams of existing walking beam conveyor systems.
  • the displaceable support structure is expediently guided by a slide guide on the walking beam, so that it can be moved relative to the walking beam within limits along the conveying direction.
  • the displaceable support structure is advantageously connected to the walking beam via a spring element.
  • the spring element e.g. a vibrating metal
  • the spring element defines a rest position of the support structure in relation to the walking beam. From this rest position, the supporting structure can be deflected to carry out a positive or negative additional stroke.
  • the spring element is preferably a compression spring which is arranged between a projection of the walking beam and an end face of the displaceable support structure.
  • the displaceable supporting structure can basically be driven by any drive unit. However, it is particularly advantageous to dispense with an additional drive unit and to arrange at least one stop in the path of movement of the displaceable supporting structure, which limits the conveying stroke of the displaceable supporting structure compared to that of the walking beam, so that the conveying stroke of the displaceable supporting structure is smaller than that of a rigid one supporting structure connected to the walking beam.
  • the displaceable supporting structure is arranged downstream of the supporting structures rigidly connected to the walking beam with respect to the conveying direction, so that the latter supporting structures carry out a longer conveying stroke than the former. This creates a gap between two successive workpieces during transport.
  • the stop is preferably installed formed so that the width of the gap that forms between two successive blocks is adjustable. If, for example, the stop is set so that the displaceable support structure can only carry out a small conveying stroke, there is a large gap between the blocks.
  • the stop can also be advantageous to couple the stop to the walking beam drive in such a way that the position of the stop is changed periodically by the walking beam drive.
  • a cam disk rotatable by the walking beam drive can expediently be used as a stop.
  • the conveyor can be designed such that the conveying stroke of the displaceable support structure is not limited with every conveying stroke of the walking beam, but for example only with every fourth conveying stroke of the walking beam.
  • a walking beam conveyor can be seen in a schematic representation.
  • the induction furnaces and the work pieces were not shown.
  • the workpieces are lifted by the support tubes 52 from a base, not shown, and transported by this through the passage opening of at least one induction coil.
  • FIG. 1 and 2 show a continuous walking beam 50 which has a double-T profile.
  • the walking beam 50 four support brackets 51 are firmly connected, e.g. screwed.
  • Each support bracket carries the horizontally aligned support tubes 52, on which the workpieces (not shown) rest when the lifting beam 50 is raised.
  • the support tubes 52 are each a tube loop through which water flows and which is firmly connected at one end 53 to the associated support support 51.
  • the connection of the free end 54 of the pipe loop to the adjacent support bracket 51 is designed as a loose layer, so that there is a certain amount of movement to compensate for thermal expansion.
  • the support brackets 51 with the associated support tubes 52 can be viewed as fixed structures connected to the walking beam 50.
  • a slide guide 55 is attached to the walking beam 50.
  • a slide 56 is arranged to be movable along the extension of the walking beam.
  • three further support brackets 57 are fastened, which, like the support brackets 51, are equipped with support tubes 52.
  • the arrangement of carriage 56, support bracket 57 and support tubes 51 can be regarded as a support structure which can be displaced relative to the walking beam in its longitudinal direction.
  • a spring element 60 (e.g. made of vibrating metal) is arranged, which connects the lifting beam 50 to the slide 56.
  • the spring element 60 is usually relaxed, so that the slide 56 with the support structures 57 and the support tubes 52 performs the same movement as the walking beam 50.
  • the latter At the end of the slide 56 facing away from the spring element 60, the latter carries a plate 61.
  • This plate 61 is opposed by a stop 62 which is designed as a cam disk which can be rotated about an axis of rotation 63.
  • the axis of rotation 63 is stationary and does not travel with the walking beam 50. However, their position can be adjusted along the conveying direction (arrow 65), so that the distance between plate 61 and stop 62 can be varied.
  • the stop movement 62 limits the feed movement of the slide 56 with the support supports 57 and the associated support tubes 52 (movable support structure), i.e. the movable support structure is unable to perform the full delivery stroke of the walking beam 50.
  • Workpieces that are in the area of influence of the movable support structure are conveyed through this by a smaller conveying stroke than those that are in the area of influence of the support structures (support supports 51 and support tubes 52) that are firmly connected to the walking beam 50.
  • a gap is drawn between two successive, closely adjacent workpieces.
  • Fig. 3 the movement diagram of the walking beam is shown.
  • the walking beam is first raised.
  • the workpieces are thus lifted from a support by the support supports 51 and 57 and the support tubes 52. They can now be transported in the conveying direction (arrow 65 in FIG. 1) by means of a conveying stroke (arrow 2).
  • the lifting beam 50 is lowered (arrow 3).
  • the workpieces are no longer exposed to the influence of the walking beam 50, but instead rest on a support.
  • the walking beam 50 is returned to its original position by a return stroke (arrow 4).
  • the movable support structure Since the movable support structure is prevented from moving longitudinally by the stop 62, its conveying stroke is smaller than that of the lifting beam 50. This is indicated in FIG. 3 by a dashed line 5, which is drawn in parallel to the arrow 3. The distance between the dashed line 5 and the arrow 3 is to be seen as the stroke difference of the two delivery strokes.
  • the stroke difference x can be changed by adjusting the position of the axis of rotation 63 of the stop 62. Due to the different transport strokes, the blocks are inevitably pulled apart so that their sticking is avoided.
  • the stop is 62 designed as a cam. This is mounted eccentrically so that the effective position of the stop 62 varies depending on the position of the cam. The length of the transport tube of the movable support structure is thus dependent on the angle of rotation of the stop 62.
  • the stop 62 can be driven, ie rotated, by the drive mechanism for the walking beam 50.
  • the mechanical coupling can take place in such a way that when four lifting cycles of the lifting beam 50 are carried out, the stop 62 rotates one full revolution. In the present case, this means that the movable support structure only moves against the stop every fourth delivery stroke of the lifting beam 50 (position of the stop as shown) and thus executes a smaller delivery stroke than the lifting beam 50.
  • a cylinder or another adjusting element can also be arranged, which shifts the movable supporting structure on the walking beam by an adjustable value.
  • This arrangement is advantageous if the blocks with their separation point lie over the gap of the two mounting rail systems, this separation point is detected and then the movable support structure is pushed back by the fixed amount. As a result, the gap between the blocks is always the same, there is no friction on the transport rails due to moving blocks.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Reciprocating Conveyors (AREA)

Description

Die Erfindung betrifft einen Hubbalkenförderer, für eine Erwärmungseinrichtung, insbesondere für einen Induktionserwärmer, zur Förderung hintereinandertolgender Werkstücke.The invention relates to a walking beam conveyor, for a heating device, in particular for an induction heater, for conveying workpieces following one another.

Insbesondere bei induktiven Schmiedeblockerwärmungsanlagen wird das zu erwärmende Gut in Form von Brammen, Knüppeln oder Blöcken aus Eisen, Eisenlegierungen oder Nichteisenmetallen durch die Induktionsspule gestoßen und dabei auf Schmiedetemperatur erwärmt. Dabei tritt in vielen Fällen ein Verkleben der einzelnen Blöcke an den sich berührenden Stimflächen auf, was zu Betriebsstörungen führt.Particularly in the case of inductive forging block heating systems, the material to be heated is pushed through the induction coil in the form of slabs, billets or blocks of iron, iron alloys or non-ferrous metals and heated to the forging temperature. In many cases, the individual blocks stick to the touching end faces, which leads to malfunctions.

Ursache für dieses Verkleben ist ein Versintern der gegeneinander gedrückten metallischen Blockenden. Dieser Sintervorgang wird begünstigt durch die Erwärmung auf Schmiedetemperatur, durch den Anpreßdruck beim Stoßen, durch magnetische Kräfte der Induktionsspule, durch Wärmedehnung und durch die Zeitdauer, während der Temperatur und Druck einwirken.The reason for this bonding is a sintering of the pressed metal block ends against each other. This sintering process is favored by the heating to the forging temperature, by the contact pressure when bumping, by magnetic forces of the induction coil, by thermal expansion and by the length of time during which the temperature and pressure act.

Da die Blöcke jedoch für die Weiterverarbeitung einzeln anfallen müssen, erfolgt eine Trennung der verklebten Blöcke. Hierfür sind Blockbrecheinrichtungen bekannt. Blockbrecher erfordern jedoch einen erheblichen Kosten-und Platzbedarf. Sie führen darüberhinaus zu Unterbrechungen des Arbeitsrythmusses und zu Problemen beim Warmhalten der bereits erwärten Blöcke vor ihrer WeiterverarbeitungHowever, since the blocks have to be produced individually for further processing, the bonded blocks are separated. Block breaking devices are known for this. Blockbreakers, however, require considerable costs and space. In addition, they lead to interruptions in the working rhythm and to problems in keeping the blocks that have already been heated warm before further processing

Durch die Verwendung des Hubbalkenprinzips anstelle des Stoßprinzips können einige der genannten Nachteile vermieden werden. Bei Hubbalkenfördersystemen werden die Werkstücke schrittweise durch wiederholtes Anheben, Vorfahren und Absenken fortbewegt. Hier besteht die Möglichkeit, die Blöcke mit stirnseitigem Abstand auf das Fördersystem zu legen. Ein stirnseitiges Zusammenrücken der Blöcke kann dennoch nicht immer vermieden werden. So treten beispielsweise im Bereich induktiver Erwärmer, insbesondere wenn diese bei hoher Leistungskonzentration betrieben werden, erhebliche magnetische Kräfte auf, die ein Zusammenrücken der Blöcke herbeiführen, welches letztlich wieder zum Verkleben führt. Ferner können durch die Temperaturausdehnung der Blöcke während des Erwärmens die Lücken zwischen zwei aufeinanderfolgenden Blöcken geschlossen werden. Verklebte Blöcke müssen auch hier voneinander getrennt werden, was mittels einer Blockbrecheinrichtung, wie beschrieben, erfolgen kann.By using the walking beam principle instead of the push principle, some of the disadvantages mentioned can be avoided. With walking beam conveyor systems, the workpieces are moved step by step by repeated lifting, advancing and lowering. Here it is possible to place the blocks on the conveyor system at a distance from the end. However, it is not always possible to avoid the blocks being pushed together at the end. For example, in the area of inductive heaters, particularly when these are operated at high power concentration, considerable magnetic forces occur which bring the blocks closer together, which ultimately leads to sticking together again. Furthermore, the gaps between two successive blocks can be closed by the temperature expansion of the blocks during the heating. Glued blocks must also be separated from each other here, which can be done by means of a block breaking device, as described.

Um den Aufwand eine Blockbrecheinrichtung zu vermeiden, wurde vorgeschlagen, Blockbrechrollen mit Nockenprofil im Entnahmerollgang vorzusehen (DE-A 3 431 819.4). Ferner ist es bekannt, das Verkleben durch Auftragen einer Paste auf die Stirnflächen der Blöcke zu vermeiden (EP- PS 0007 014). Diese Maßnahmen sind jedoch entweder relativ arbeitsintensiv oder führen andere Nachteile, wie Verformung der Blöcke, mit sich.In order to avoid the expense of a block breaking device, it has been proposed to provide block breaking rollers with a cam profile in the removal roller table (DE-A 3 431 819.4). It is also known to avoid sticking by applying a paste to the end faces of the blocks (EP-PS 0007 014). However, these measures are either relatively labor intensive or have other disadvantages, such as deformation of the blocks.

Aufgabe der Erfindung ist es, hier einen Ausweg zu finden und ein Verkleben (Verbacken, Versintem oder Verschweißen) der Blöcke zuverlässig zu vermeiden. Insbesondere soll ein Hubbalkenförderer der eingangs genannten Art angegeben werden, der einen durchgehenden Hubbalken aufweist.The object of the invention is to find a way out here and to reliably avoid sticking (caking, sintering or welding) of the blocks. In particular, a walking beam conveyor of the type mentioned at the beginning is to be specified, which has a continuous walking beam.

Die Aufgabe wird erfindungsgemäß bei einem Hubbalkenförderer der eingangs genannten Art dadurch gelöst, daß er wenigstens zwei Abschnitte mit unterschiedlichen Förderhub aufweist. Die Förderhublänge des nachgeordneten Abschnittes ist dabei größer als die des vorhergehenden Abschnittes. Zu diesem Zweck sind auf dem Hubbalken wenigstens zwei Tragstrukturen für den Werkstücktransport getrennt voneinander angeordnet. Wenigstens eine dieser Tragstruktur ist relativ zum Hubbalken in dessen Längsrichtung verschiebbar angeordnet. Der Hubbalken führt dabei die Grundbewegung aus, die aus Förderhub, Absenken, Rückstellhub und Anheben besteht. Die fest mit dem Hubbalken verbundenen Tragstrukturen übertragen den jeweiligen Förderhub dieser Grundbewegung auf das Werkstück. Eine verschiebbare Tragstruktur läßt sich relativ zum Hubbalken bewegen, so daß durch sie ein Förderhub auf das Werkstück übertragen werden kann, der sich von dem Förderhub des Hubbalkens unterscheidet. Diese Lösung bringt den besonderen Vorteil mit sich, daß sich in der Regel entsprechende feste und verschiebbare Tragstrukturen auf Hubbalken bereits bestehender Hubbalkenfördersysteme nachrüsten lassen.The object is achieved in a walking beam conveyor of the type mentioned in that it has at least two sections with different conveying strokes. The conveyor stroke length of the downstream section is greater than that of the previous section. For this purpose, at least two support structures for the workpiece transport are arranged separately from one another on the walking beam. At least one of these support structures is arranged to be displaceable relative to the walking beam in the longitudinal direction thereof. The walking beam executes the basic movement, which consists of the conveying stroke, lowering, return stroke and lifting. The supporting structures firmly connected to the walking beam transmit the respective conveying stroke of this basic movement to the workpiece. A displaceable support structure can be moved relative to the walking beam, so that it can be used to transmit a conveying stroke to the workpiece, which differs from the conveying stroke of the walking beam. This solution has the particular advantage that corresponding fixed and displaceable support structures can usually be retrofitted on walking beams of existing walking beam conveyor systems.

In zweckmäßiger Weise wird die verschiebbare Tragstruktur durch eine Schlittenführung auf dem Hubbalken geführt, so daß sie sich in Grenzen längs der Förderrichtung auf dem Hubbalken relativ zu diesem bewegen läßt.The displaceable support structure is expediently guided by a slide guide on the walking beam, so that it can be moved relative to the walking beam within limits along the conveying direction.

In vorteilhafter Weise ist die verschiebbare Tragstruktur über ein Federelement mit dem Hubbalken verbunden. Das Federelement (z.B. ein Schwingmetall) definiert eine Ruhelage der Tragstruktur gegenüber dem Hubbalken. Aus dieser Ruhelage ist die Tragstruktur zur Ausführung eines positiven oder negativen Zusatzhubes auslenkbar. Vorzugsweise ist das Federelement eine Druckfeder, die zwischen einem Vorsprung des Hubbalkens und einer Endfläche der verschiebbaren Tragstruktur angeordnet ist.The displaceable support structure is advantageously connected to the walking beam via a spring element. The spring element (e.g. a vibrating metal) defines a rest position of the support structure in relation to the walking beam. From this rest position, the supporting structure can be deflected to carry out a positive or negative additional stroke. The spring element is preferably a compression spring which is arranged between a projection of the walking beam and an end face of the displaceable support structure.

Die verschiebbare Tragstruktur ist grundsätzlich durch ein beliebiges Antriebsaggregat antreibbar. Es ist jedoch besonders vorteilhaft, auf ein zusätzliches Antriebsaggregat zu verzichten und wenigstens einen Anschlag in der Bewegungsbahn der verschiebbaren Tragstruktur anzuorden, der den Förderhub der verschiebbaren Tragstruktur gegenüber dem des Hubbalkens begrenzt, so daß der Förderhub der verschiebbaren Tragstruktur kleiner ist, als der einer starr mit dem Hubbalken verbundenen Tragstruktur. In diesem Falls ist die verschiebbare Tragstruktur den starr mit dem Hubbalken verbundenen Tragstrukturen bezüglich der Förderrichtung nachgeordnet, so daß die letzteren Tragstrukturen einen größeren Förderhub ausführen als die erstere. Hierdurch wird beim Transport eine Lücke zwischen zwei aufeinanderfolgenden Werkstücken gezogen.The displaceable supporting structure can basically be driven by any drive unit. However, it is particularly advantageous to dispense with an additional drive unit and to arrange at least one stop in the path of movement of the displaceable supporting structure, which limits the conveying stroke of the displaceable supporting structure compared to that of the walking beam, so that the conveying stroke of the displaceable supporting structure is smaller than that of a rigid one supporting structure connected to the walking beam. In this case, the displaceable supporting structure is arranged downstream of the supporting structures rigidly connected to the walking beam with respect to the conveying direction, so that the latter supporting structures carry out a longer conveying stroke than the former. This creates a gap between two successive workpieces during transport.

Vorzugsweise wird der Anschlag einstallbar ausgebildet, so daß die Breite der Lücke, die sich zwischen zwei aufeinanderfolgenden Blöcken bildet, einstellbar ist. Wird beispielsweise der Anschlag so eingestellt, daß die verschiebbare Tragstruktur lediglich einen kleinen Förderhub ausführen kann, so ergibt sich eine große Lücke zwischen den Blöcken.The stop is preferably installed formed so that the width of the gap that forms between two successive blocks is adjustable. If, for example, the stop is set so that the displaceable support structure can only carry out a small conveying stroke, there is a large gap between the blocks.

Es kann auch vorteilhaft sein, den Anschlag mit dem Hubbalkenantrieb derart zu koppeln, daß die Lage des Anschlages durch den Hubbalkenantrieb periodisch verändert wird. Hierbei kann zweckmäßigerweise als Anschlag eine durch den Hubbalkenantrieb drehbare Kurvenscheibe verwendet werden. Auf diese Weise kann der Förderer derart ausgelegt werden, daß der Förderhub der verschiebbaren Tragstruktur nicht bei jedem Förderhub des Hubbalkens begrenzt wird, sondern beispielsweise nur bei jedem vierten Förderhub des Hubbalkens.It can also be advantageous to couple the stop to the walking beam drive in such a way that the position of the stop is changed periodically by the walking beam drive. In this case, a cam disk rotatable by the walking beam drive can expediently be used as a stop. In this way, the conveyor can be designed such that the conveying stroke of the displaceable support structure is not limited with every conveying stroke of the walking beam, but for example only with every fourth conveying stroke of the walking beam.

Anhand der Zeichnung, die ein Ausführungsbeispiel der Erfindung zeigt, werden die Erfindung sowie weitere vorteilhafte Ausgestaltungen näher erläutert und beschrieben.The invention and further advantageous embodiments are explained and described in more detail with reference to the drawing, which shows an exemplary embodiment of the invention.

Es zeigt:

  • Fig. 1 einen Hubbalkenförderer gemäß der Erfindung in Seitenansicht,,
  • Fig. 2 ein Hubbalkenförderer nach Fig. 1 im Schnitt 11-11 und
  • Fig. 3 einen Bewegungsdiagramm des Hubbalkens.
It shows:
  • 1 is a walking beam conveyor according to the invention in side view,
  • Fig. 2 is a walking beam conveyor according to Fig. 1 in section 11-11 and
  • Fig. 3 is a movement diagram of the walking beam.

Den Figuren 1 und 2 ist ein Hubbalkenförderer in schematischer Darstellung entnehmbar. Um das Wesentliche hervorzuheben, wurden die Induktionsöfen und die Werkstücke (insbesondere Blöcke oder Knüppel) nicht dargestellt. Die Werkstücke werden durch die Tragrohre 52 von einer nicht dargestellten Unterlage abgehoben und von dieser durch die Durchtrittsöffnung wenigstens einer Induktionsspule transportiert.1 and 2, a walking beam conveyor can be seen in a schematic representation. To emphasize the essentials, the induction furnaces and the work pieces (especially blocks or billets) were not shown. The workpieces are lifted by the support tubes 52 from a base, not shown, and transported by this through the passage opening of at least one induction coil.

In Figur 1 und 2 ist ein durchgehender Hubbalken 50 dargestellt, der ein Doppel-T-Profil aufweist. Mit dem Hubbalken 50 sind vier Tragstützen 51 fest verbunden, z.B. verschraubt. Jede Tragstütze trägt die horizontal ausgerichteten Tragrohre 52, auf denen bei angehobenem Hubbalken 50 die Werkstücke (nicht dargestellt) aufliegen. Bei den Tragrohren 52 handelt sich je um eine wasserdurchströmte Rohrschleife, die an ihrem einen Ende 53 fest mit der zugehörigen Tragstütze 51 verbunden ist. Die Verbindung des freien Endes 54 der Rohrschleife mit der benachbarten Tragstütze 51 ist als lose Lage ausgebildet, so daß ein gewisser Bewegungsspielraum zum Ausgleich von Wärmeausdehnung gegeben ist. Die Tragstützen 51 mit den zugehörigen Tragrohren 52 können als fest mit dem Hubbalken 50 verbundene Trafstrukturen angesehen werden. Neben den beschriebenen festen Tragstrukturen ist auf dem Hubbalken 50 eine Schlittenführung 55 befestigt. In der Schlittenführung 55 ist ein Schlitten 56 längs der Hubbalkenausdehnung bewegbar angeordnet. Auf dem Schlitten 56 sind drei weitere Tragstützen 57 befestigt, die wie die Tragstützen 51 mit Tragrohren 52 ausgestattet sind. Die Anordnung aus Schlitten 56, Tragstütze 57 und Tragrohre 51 kann als relativ zum Hubbalken in dessen Längsrichtung verschiebbare Tragstruktur angesehen werden.1 and 2 show a continuous walking beam 50 which has a double-T profile. With the walking beam 50 four support brackets 51 are firmly connected, e.g. screwed. Each support bracket carries the horizontally aligned support tubes 52, on which the workpieces (not shown) rest when the lifting beam 50 is raised. The support tubes 52 are each a tube loop through which water flows and which is firmly connected at one end 53 to the associated support support 51. The connection of the free end 54 of the pipe loop to the adjacent support bracket 51 is designed as a loose layer, so that there is a certain amount of movement to compensate for thermal expansion. The support brackets 51 with the associated support tubes 52 can be viewed as fixed structures connected to the walking beam 50. In addition to the fixed support structures described, a slide guide 55 is attached to the walking beam 50. In the slide guide 55, a slide 56 is arranged to be movable along the extension of the walking beam. On the carriage 56, three further support brackets 57 are fastened, which, like the support brackets 51, are equipped with support tubes 52. The arrangement of carriage 56, support bracket 57 and support tubes 51 can be regarded as a support structure which can be displaced relative to the walking beam in its longitudinal direction.

Zwischen einer Endfläche 58 des Schlittens 56 und einem Vorsprung 59 des Hubbalkens 50 ist ein Federelement 60 (z.B. aus Schwingmetall) angeordnet, das den Hubbalken 50 mit dem Schlitten 56 verbindet. Gewöhnlich ist das Federelement 60 entspannt, so daß der Schlitten 56 mit den Tragstrukturen 57 und den Tragrohren 52 die gleiche Bewegung ausführt, wie der Hubbalken 50.Between an end surface 58 of the slide 56 and a projection 59 of the walking beam 50, a spring element 60 (e.g. made of vibrating metal) is arranged, which connects the lifting beam 50 to the slide 56. The spring element 60 is usually relaxed, so that the slide 56 with the support structures 57 and the support tubes 52 performs the same movement as the walking beam 50.

An dem dem Federelement 60 abgewandten Ende des Schlittens 56 trägt dieser eine Platte 61. Dieser Platte 61 steht ein Anschlag 62 gegenüber, der als um eine Drehachse 63 drehbare Kurvenscheibe ausgebildet ist. Die Drehachse 63 ist ortsfest und fährt nicht mit dem Hubbalken 50 mit. Ihre Lage läßt sich jedoch längs der Förderrichtung (Pfeil 65) einstellen, so daß der Abstand zwischen Platte 61 und Anschlag 62 variierbar ist.At the end of the slide 56 facing away from the spring element 60, the latter carries a plate 61. This plate 61 is opposed by a stop 62 which is designed as a cam disk which can be rotated about an axis of rotation 63. The axis of rotation 63 is stationary and does not travel with the walking beam 50. However, their position can be adjusted along the conveying direction (arrow 65), so that the distance between plate 61 and stop 62 can be varied.

Durch den Anschlag 62 wird die Vorschubbewegung des Schlittens 56 mit den Tragstützen 57 und den zugehörigen Tragrohren 52 (bewegliche Tragstruktur) begrenzt, d.h. die bewegliche Tragstruktur ist nicht in der Lage den vollen Förderhub des Hubbalkens 50 auszuführen. Werkstücke die sich im Einflußbereich der beweglichen Tragstruktur befinden, werden durch diese um einen kleineren Förderhub weiterbefördert, als solche, die sich im Einflußbereich der mit dem Hubbalken 50 fest verbundenen Tragstrukturen (Tragstützen 51 und Tragrohre 52) befinden. Sobald also die Werkstücke aus dem Einflußbereich der beweglichen Tragstrukturen in den der unbeweglichen Tragstrukturen übergehen, wird zwischen zwei aufeinanderfolgenden, dicht aneinanderliegenden Werkstücken einen Spalt gezogen.The stop movement 62 limits the feed movement of the slide 56 with the support supports 57 and the associated support tubes 52 (movable support structure), i.e. the movable support structure is unable to perform the full delivery stroke of the walking beam 50. Workpieces that are in the area of influence of the movable support structure are conveyed through this by a smaller conveying stroke than those that are in the area of influence of the support structures (support supports 51 and support tubes 52) that are firmly connected to the walking beam 50. As soon as the workpieces pass from the area of influence of the movable support structures into that of the immovable support structures, a gap is drawn between two successive, closely adjacent workpieces.

In Fig. 3 ist das Bewegungsdiagramm des Hubbalkens dargestellt. Gemäß Pfeil 1 wird der Hubbalken zunächst angehoben. Damit werden die Werkstücke durch die Tragstützen 51 und 57 und die Tragrohre 52 von einer Auflage abgehoben. Sie lassen sich nun durch einen Förderhub (Pfeil 2) in Förderrichtung (Pfeil 65 in Fig. 1) transportieren. Nach Ausführung des Förderhubes wird der Hubbalken 50 abgesenkt (Pfeil 3). Die Werkstücke sind jetzt nicht mehr dem Einfluß des Hubbalkens 50 ausgesetzt, sondern liegen wieder auf einer Auflage auf. Schließlich wird der Hubbalken 50 durch einen Rückstellhub (Pfeil 4) in seine ursprüngliche Lage zurückgefahren.In Fig. 3 the movement diagram of the walking beam is shown. According to arrow 1, the walking beam is first raised. The workpieces are thus lifted from a support by the support supports 51 and 57 and the support tubes 52. They can now be transported in the conveying direction (arrow 65 in FIG. 1) by means of a conveying stroke (arrow 2). After the delivery stroke has been carried out, the lifting beam 50 is lowered (arrow 3). The workpieces are no longer exposed to the influence of the walking beam 50, but instead rest on a support. Finally, the walking beam 50 is returned to its original position by a return stroke (arrow 4).

Da die bewegliche Tragstruktur durch den Anschlag 62 in ihrer Längsbewegung gehindert ist, ist ihr Förderhub kleiner als der des Hubbalkens 50. Dies ist in Fig. 3 durch eine gestrichelte Linie 5, die parallel zum Pfeil 3 eingezeichnet ist, angedeutet. Der Abstand zwischen der gestrichelten Linie 5 und dem Pfeil 3 ist als Hubdifferenz der beiden Förderhübe anzusehen. Durch Einstellung der Lage der Drehachse 63 des Anschlages 62 kann die Hubdifferenz x verändert werden. Durch die unterschiedlichen Transporthübe werden die Blöcke zwangsläufig auseinandergezogen, so daß ihr Verkleben vermieden wird.Since the movable support structure is prevented from moving longitudinally by the stop 62, its conveying stroke is smaller than that of the lifting beam 50. This is indicated in FIG. 3 by a dashed line 5, which is drawn in parallel to the arrow 3. The distance between the dashed line 5 and the arrow 3 is to be seen as the stroke difference of the two delivery strokes. The stroke difference x can be changed by adjusting the position of the axis of rotation 63 of the stop 62. Due to the different transport strokes, the blocks are inevitably pulled apart so that their sticking is avoided.

Wie bereits erwähnt wurde, ist der Anschlag 62 als Kurvenscheibe ausgebildet. Diese ist exzentrisch gelagert, so daß je nach Stellung der Kurvenscheibe die wirksame Stellung des Anschlages 62 variiert. Damit ist die Länge des Transportubes der beweglichen Tragstruktur von dem Drehwinkel des Anschlages 62 abhängig. Der Anschlag 62 kann durch den Antriebsmechanismus für den Hubbalken 50 angetrieben, d.h. verdreht werden. Die mechanische Kopplung kann derart erfolgen, daß bei Durchführung von vier Hubzyklen des Hubbalkens 50 eine volle Umdrehung des Anschlages 62 erfolgt. Das bedeutet im vorliegenden Fall, daß die bewegliche Tragstruktur lediglich bei jedem vierten Förderhub des Hubbalkens 50 gegen den Anschlag fährt (Position des Anschlages wie dargestellt) und damit einen kleineren Förderhub als der Hubbalken 50 ausführt.As already mentioned, the stop is 62 designed as a cam. This is mounted eccentrically so that the effective position of the stop 62 varies depending on the position of the cam. The length of the transport tube of the movable support structure is thus dependent on the angle of rotation of the stop 62. The stop 62 can be driven, ie rotated, by the drive mechanism for the walking beam 50. The mechanical coupling can take place in such a way that when four lifting cycles of the lifting beam 50 are carried out, the stop 62 rotates one full revolution. In the present case, this means that the movable support structure only moves against the stop every fourth delivery stroke of the lifting beam 50 (position of the stop as shown) and thus executes a smaller delivery stroke than the lifting beam 50.

Anstelle der Kurvenscheibe kann auch ein Zylinder oder ein anderes Verstellelement angeordnet sein, welcher die bewegliche Tragstruktur um einen einstellbaren Wert auf dem Hubbalken verschiebt. Diese Anordnung ist dann vorteilhaft, wenn die Blöcke mit ihrer Trennstelle über dem Spalt der beiden Tragschienensysteme liegen, diese Trennstelle erfaßt wird und dann die bewegliche Tragstruktur um den festeingestellten Betrag zurückgeschoben wird. Dadurch wird der Spalt zwischen den Blöcken immer gleich groß, es gibt keine Reibung auf den Transportschienen durch sich verschiebende Blöcke.Instead of the cam, a cylinder or another adjusting element can also be arranged, which shifts the movable supporting structure on the walking beam by an adjustable value. This arrangement is advantageous if the blocks with their separation point lie over the gap of the two mounting rail systems, this separation point is detected and then the movable support structure is pushed back by the fixed amount. As a result, the gap between the blocks is always the same, there is no friction on the transport rails due to moving blocks.

Claims (9)

1. Walking beam conveyor for a heating apparatus, in particular for an induction heater for conveying successive workpieces, characterized in that it has at least two supporting structures (51, 57) for workpiece transport which are arranged separately from one another on a walking beam (50) and of which at least one supporting structure (57) is arranged so as to be displaceable relative to the walking beam (50), in the longitudinal direction of the latter, with the result that sections having a different conveying stroke length are formed, the conveying stroke length of the downstream section being greater than that of the preceding section.
2. Walking beam conveyor according to Claim 1, characterized in that the displaceable supporting structure (57) is guided by a carriage guideway (55) on the walking beam (50).
3. Walking beam conveyor according to Claim 1 or 2, characterized in that the displaceable supporting structure (57) is connected to the walking beam (50) by a spring element (60).
4. Walking beam conveyor according to Claim 3, characterized in that the spring element (60) is a compression spring, which is arranged between a projection (59) of the walking beam (50) and an end face (58) of the displaceable supporting structure (57).
5. Walking beam conveyor according to one of Claims 1 to 4, characterized in that at least one stop (62) is arranged in the path of movement of the displaceable supporting structure (57), limiting the longitudinal stroke of the displaceable supporting structure.
6. Walking beam conveyor according to Claim 5, characterized in that the position of the stop (62) can be adjusted.
7. Walking beam conveyor according to Claim 6, characterized in that an adjusting element of the stop (62) is coupled to the walking beam drive in such a way that the position of the stop (62) changes periodically with the movement of the walking beam.
8. Walking beam conveyor according to Claim 7, characterized in that the stop (62) is designed as a cam disc which is rotated by the walking beam drive.
9. Walking beam conveyor according to Claim 8, characterized in that, instead of the stop (62), an adjusting element is arranged in such a way that the displaceable supporting structure (57) can be displaced by an adjustable amount at any time during the transport movement of the walking beam (50).
EP86103957A 1985-05-25 1986-03-22 Walking beam transport system Expired EP0205772B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3518977 1985-05-25
DE3518977A DE3518977C1 (en) 1985-05-25 1985-05-25 Walking beam conveyor system

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Publication Number Publication Date
EP0205772A1 EP0205772A1 (en) 1986-12-30
EP0205772B1 true EP0205772B1 (en) 1989-07-19

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CN106040558A (en) * 2016-07-29 2016-10-26 克拉玛依双信防腐技术有限公司 Step rotating device for inner spraying-coating oil pipe and application method thereof

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Publication number Priority date Publication date Assignee Title
DE2346826A1 (en) * 1973-09-18 1975-03-27 Koppers Wistra Ofenbau Gmbh Metal heat-treatment lifting-beam furnace - with fixed hydraulic cylinder engaging top frame and elevating cylinder linking frames
DE2830921A1 (en) * 1978-07-14 1980-01-31 Bbc Brown Boveri & Cie METHOD FOR PREVENTING SINTERING AT FORGED BLOCKS

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DE3518977C1 (en) 1986-01-09
EP0205772A1 (en) 1986-12-30
DE3664531D1 (en) 1989-08-24

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