EP1620251B1 - Press comprising a correction of a press band course and method of controlling a press band - Google Patents

Press comprising a correction of a press band course and method of controlling a press band Download PDF

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Publication number
EP1620251B1
EP1620251B1 EP03732392A EP03732392A EP1620251B1 EP 1620251 B1 EP1620251 B1 EP 1620251B1 EP 03732392 A EP03732392 A EP 03732392A EP 03732392 A EP03732392 A EP 03732392A EP 1620251 B1 EP1620251 B1 EP 1620251B1
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EP
European Patent Office
Prior art keywords
press
belt
rotating rods
pressing
course
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EP03732392A
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German (de)
French (fr)
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EP1620251A1 (en
Inventor
Erich Haider
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Lignum Technologies AG
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Kronoplus Technical AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
    • B30B5/04—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band
    • B30B5/06—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band co-operating with another endless band
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
    • B30B5/04—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band
    • B30B5/06—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band co-operating with another endless band
    • B30B5/065—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band co-operating with another endless band using anti-friction means for the pressing band
    • B30B5/067—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band co-operating with another endless band using anti-friction means for the pressing band using anti-friction roller means

Definitions

  • the invention relates to a continuous, in particular a double belt press and a method for controlling the course of the press belt.
  • a double belt press comprises two circulating belts which are pressed against each other.
  • the DE 41 10 678 C1 such as DE 198 24 723 C1 disclose presses of the type according to the invention.
  • the continuous press is used to press glue-provided wood particles, fibers, chips or already pre-pressed fiber mat, in particular with the supply of heat.
  • rolling rods or rollers which exert suitable pressure on the respective press belt in the direction of the material to be pressed.
  • a plurality of rolling rods are arranged parallel to one another and fastened on the right and left on a chain.
  • the two chains are driven by gears.
  • the gears are attached laterally to an insertion or on a Ausblownwelle.
  • the rolling rods with the chains also form a circulating belt.
  • the rolling rods or the band formed thereby is thus on one side of a press belt.
  • the DE 41 10 678 C1 discloses a continuous press with circumferentially driven steel belts, in the actual pressing area, the respective steel strip is guided by means of rolling elements or rolling rods. By varying the pressure exerted by the roll bars on the press belt, the course of the respective steel strip is corrected.
  • German patent application DE 199 31 175 A1 discloses a press for the pressing of a material to be pressed to a component with a rotating pressing belt and control means, with which the course of the press belt is controlled.
  • the control means comprise rolling rods and adjusting means with which the rolling rods can be adjusted obliquely to the transport direction of the press belt.
  • the rolling rods are attached to chains on the side.
  • the object of the invention is to provide a method and a device in which, on the one hand, the press belt of a continuous press maintains the desired course in the press area and, on the other hand, the product quality is not impaired in the aforementioned manner.
  • the object of the invention is achieved by a device having the features of the first claim.
  • a method of solving the problem comprises the features of the independent claim.
  • the rolling rods are merely aligned with respect to their position in the plane which is parallel to the press belt. In the ground state, the rolling rods are aligned in the ideal state perpendicular to the direction of the press belt. If a press belt deviates undesirably from the desired course, then the rolling rods are unscrewed from this vertical position relative to the press belt in such a way that a counteraction is achieved and the press belt returns to the desired course. This ensures that the press belt is returned to the desired position or takes the desired course. It is not necessary to change the pressure exerted by the rolling rods on the press belt. As a result, a consistent product quality is achieved.
  • An apparatus for carrying out the method comprises in an advantageous embodiment measuring devices for detecting the course of the press belt within the pressing area.
  • the device further comprises a control device or control means in order to suitably control the position of the rolling rods in the aforementioned manner as a function of the measured course of the belt.
  • a mechanical sensor is used in particular.
  • this comprises an end with a roller which adjoins the band.
  • the sensor is shifted mechanically as soon as the belt changes position.
  • the mechanical change is registered and fed to the control device.
  • the position of the gears is suitably changed over which the chains out become.
  • the control takes place via typically via servo cylinder with a maximum stroke of preferably at least ⁇ 1 mm. In general, however, is controlled in tenths of a millimeter range to properly correct the band history. A smaller stroke of more than 1/10 millimeter can therefore already be sufficient in principle.
  • the rolling rods are preferably left and right on a chain or are attached to two chains.
  • the chains are driven by gears. There are gears that are responsible for the fact that the rolling rods are adjacent to the respective band. Other gears are provided in a different plane. These gears serve u.a. to tension the chain.
  • the links are due to production or due to material fatigue, undesirably different lengths.
  • individual chain links have been undesirably stretched during operation, for example.
  • Such unwanted stretching leads to a running out of the conveyor belt from the desired target curve to the left or to the right in the manner mentioned above. Differently long chain links thus lead to production disruptions.
  • the position of the insertion shaft determines the position of the rolling rods. So here it is ensured that the rolling rods are perpendicular to the press belt and thus a press belt is initially controlled properly.
  • the material to be pressed is fed into the press much faster, typically at twice the speed, compared to the transport speed of the rolling rods. This can have the consequence that the pressed material reaches an area of the press where the rolling rods are inclined in the aforementioned sense. At that moment, the undesired skew would cause the press belt to deflate the desired intended course.
  • the aforementioned problem occurs only in the case of starting a press cycle.
  • Stretched chain links can be determined directly or indirectly.
  • the length of chain links can also be measured directly. However, this is very expensive, since the measurement must be performed at rest. It depends on differences in the tenth of a millimeter range. Hundredselmillimeter Kunststoffe also play a role. A chain can easily be 100 m long. The metrological effort is therefore very large, to determine the length of each link of the chain by retiming. This procedure is therefore usually not performed. In principle, however, it is also possible to measure directly.
  • Another measuring method is to provide an optical marking or a pulse generator at the input shafts or at the gears, which emits electrical pulses, for example. If both chains have the same length chain links, there is no divergence of the pulse generators or markings relative to each other. These always transmit one pulse to one sensor at a time or two sensors measure the markings at the same time. If there are differences in the chains due to different chain lengths, the sensors register the pulses or markings at different times. From this differences of the links of a chain can be determined, for example calculated. This can be used as input to make the control according to the invention. The control compensates for chain errors, ie different lengths of the chain links. The production can be accelerated compared to the prior art and / or the product quality can be improved.
  • gears are used which serve exclusively for measuring or measuring the chain.
  • These additional gears have pulser or optical markers.
  • the gears are paired in particular inserted one behind the other. These have a very small distance from each other of z. B. 1000 mm.
  • the times of the pulse generators are compared with each other. Resulting deviations provide information about resulting deviations of the intended chain length or chain link length. Furthermore, this directly determines the inclination of the rolling rods in the pressing area. So there are a total of four gears used. Preferably, these are located in the return area in order to influence the actual production process under any circumstances. In fact, information obtained in the press or production sector can be erroneous because the effects of pressure can falsify the result,
  • Cogwheels arranged one behind the other in the direction of travel preferably serve for the exact determination of lengths of the chain links.
  • a laminate floor comprises a plate preferably made of a wood material such. As HDF, MDF or chipboard. Above and below such a truss material papers are attached. On the one hand a decorative paper is provided, which determines the appearance of the floor. On the other hand, a Martinezzugpapier is provided, which prevents the plate warps after pressing. Above the decorative paper is an abrasion-resistant layer to protect the floor against abrasion. Below can still be provided a layer of sound-insulating material.
  • lateral areas of the press belt in the pressing area are braked or accelerated in order to control the course of the press belt.
  • FIG. 1 outlined a continuous press for the production of MDF, HDF or chipboard and the like.
  • Two steel press belts 1 are passed around rollers 2.
  • Rotatably mounted rods 3, called rolling rods, are connected to each other in a band-like manner via chains 4.
  • the chains 4 are driven by gears, not shown.
  • the gears are located at the ends of input shafts 5 and output shafts 6.
  • the band formed from the rolling rods 3 is guided around the aforementioned shafts 5 and 6, and as a rule at a speed significantly lower than the speed with which the press belts 1 are guided around the rollers 2 around. This has the consequence that the rotatably mounted rolling rods rotate.
  • the material to be pressed is transported along the arrow 7 in the press.
  • the pressing then takes place in the area to which the rolling rods border.
  • FIG. 2 shows a plan view of the rolling rods 3. These are arranged perpendicular to the transport direction 7.
  • FIG. 3 is shown in plan the case that a group of rolling rods 3a is not aligned exactly perpendicular to the transport direction due to different lengths of chain links of the chains 4. This oblique position causes an undesirable deviation of the press belt from the desired course, when this obliquely oriented roll bar presses on the press belt to transfer pressure on the pressed material.
  • FIG. 3 Not shown output shaft is temporarily oriented obliquely opposite, so according to FIG. 3 on the right side in the direction of the arrow 8, so as to compensate for the inclination of the rolling rod 3a.
  • two gears 9 are arranged one behind the other and provided with markers or pulse generators 10. Not shown sensors register the markers, for example in the "three o'clock" position shown. As long as the two markers 10 are registered at the same time by the sensors, there are no chain links of different lengths. Only when between the two gears a chain link arrives, which is stretched over the other, for example, the markers are registered at different times. Based on the rotational speed of the gears and the time difference can then be determined the deviation in the length of the chain link. This information is used to control the orientation of the rolling rods.
  • FIG. 5 Based on FIG. 5 is clarified in a plan, as the course of the press belt or deviations from the desired course can be determined.
  • Rotatable wheels 11 are pressed by spring force in the direction of the respective edge of the press belt. You can also go along of the double arrow 12 are moved.
  • a displacement sensor 13 is able to detect this movement along the double arrow 12.
  • the wheels 11 move accordingly along the double arrow 12.
  • the respective displacement sensor 13 detects the change. The change directly reflects the deviation from the target course.
  • the detected change is transmitted to an electronic system. This now controls in response to the inclination of corresponding rolling rods until the desired course is restored.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Control Of Presses (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)

Abstract

A press for pressing a material to form a structural component comprises at least one revolving press band and a control for controlling the course of the press band. The control is preferably carried out via rotating rods that engage the press band and that can be tilted at a convenient angle for the purposes of varying the direction of travel of the press band. According to the method, the band of the press can be controlled by appropriately tilting the rotating rods.

Description

Die Erfindung betrifft eine kontinuierliche und zwar insbesondere eine Doppelbandpresse sowie ein Verfahren zur Steuerung des Verlaufs des Pressbandes. Eine Doppelbandpresse umfasst zwei umlaufende Bänder, die gegeneinander gepresst werden. Die DE 41 10 678 C1 sowie DE 198 24 723 C1 offenbaren Pressen der erfindungsgemäßen Art.The invention relates to a continuous, in particular a double belt press and a method for controlling the course of the press belt. A double belt press comprises two circulating belts which are pressed against each other. The DE 41 10 678 C1 such as DE 198 24 723 C1 disclose presses of the type according to the invention.

Die kontinuierliche Presse wird verwendet, um mit Leim versehene Holzpartikel, Fasern, Späne oder eine bereits vorgepresste Fasermatte zu verpressen und zwar Insbesondere unter Zufuhr von Wärme.The continuous press is used to press glue-provided wood particles, fibers, chips or already pre-pressed fiber mat, in particular with the supply of heat.

Insbesondere bei einer Doppelbandpresse besteht das Problem, dass ein umlaufendes Band In Transportrichtung gesehen nach links oder nach rechts herausläuft. Das Problem des herauslaufenden Bandes ist vor allem im Pressbereich problematisch. Bei einer Doppelbandpresse liegt dieser Bereich zwischen den beiden Walzen am vorderen und am hinteren Ende, um die das jeweilige umlaufende Stahlband herumgeführt wird.Particularly in the case of a double-belt press, there is the problem that a circulating belt runs out to the left or to the right in the direction of transport. The problem of the outgoing tape is problematic, especially in the pressing area. In a double belt press, this area is between the two rollers at the front and at the rear end, around which the respective circulating steel strip is guided.

Im Pressbereich gibt es Rollstäbe oder Walzen, die geeignet Druck auf das jeweilige Pressband in Richtung des zu verpressenden Guts ausüben. Insbesondere sind mehrere Rollstäbe parallel zueinander angeordnet und rechts und links an einer Kette befestigt. Die beiden Ketten werden über Zahnräder angetrieben. Die Zahnräder sind seitlich an einer Einführwelle bzw. an einer Ausführwelle befestigt. Auf diese Weise bilden die Rollstäbe mit den Ketten ebenfalls ein umlaufendes Band. Die Rollstäbe bzw. das hierdurch gebildete Band liegt also an einer Seite an ein Pressband an.In the pressing area there are rolling rods or rollers which exert suitable pressure on the respective press belt in the direction of the material to be pressed. In particular, a plurality of rolling rods are arranged parallel to one another and fastened on the right and left on a chain. The two chains are driven by gears. The gears are attached laterally to an insertion or on a Ausführwelle. In this way, the rolling rods with the chains also form a circulating belt. The rolling rods or the band formed thereby is thus on one side of a press belt.

Die vorgenannten Merkmale gehören einzeln oder in Kombination zur vorliegenden Erfindung.The aforementioned features belong individually or in combination to the present invention.

Die DE 41 10 678 C1 offenbart eine Durchlaufpresse mit umlaufend angetriebenen Stahlbändern, Im eigentlichen Pressbereich wird das jeweilige Stahlband mittels Rollkörper bzw. Rollstäbe geführt. Durch Variation des Drucks, den die Rollstäbe auf das Pressband ausüben, wird der Verlauf des jeweiligen Stahlbandes korrigiert.The DE 41 10 678 C1 discloses a continuous press with circumferentially driven steel belts, in the actual pressing area, the respective steel strip is guided by means of rolling elements or rolling rods. By varying the pressure exerted by the roll bars on the press belt, the course of the respective steel strip is corrected.

Durch Änderung des Drucks, den die Rollstäbe auf das Pressband ausüben, gelingt es zwar grundsätzlich, den Verlauf eines als Pressband eingesetzten Stahlbandes zu steuern. Nachteilhaft wird bei der vorgenannten Lösung des Problems auch der Druck verändert, der auf das zu verpressende Gut wirkt. Hierdurch ergeben sich Beeinträchtigungen der Produktqualität.By changing the pressure exerted by the rolling rods on the press belt, it is basically possible to control the course of a steel strip used as a press belt. Disadvantageously, in the aforementioned solution to the problem, the pressure which acts on the material to be compacted is also changed. This results in impairments of product quality.

Das vorliegende Problem tritt insbesondere bei besonders langen Pressen auf. Hier neigt ein umlaufendes Pressband im Pressbereich besonders stark dazu, vom Sollverlauf abzuweichen.The present problem occurs especially with very long presses. Here, a rotating press belt in the pressing area is particularly prone to deviate from the desired course.

Die deutsche Offenlegungsschrift DE 199 31 175 A1 offenbart eine Presse für das Verpressen eines Pressgutes zu einem Bauteil mit einem umlaufenden Pressband sowie Steuerungsmitteln, mit dem der Verlauf des Pressbandes gesteuert wird. Die Steuerungsmittel umfassen Rollstäbe sowie Stellmittel, mit denen die Rollstäbe schräg zur Transportrichtung des Pressbandes eingestellt werden können. Die Rollstäbe sind seitlich an Ketten befestigt.The German patent application DE 199 31 175 A1 discloses a press for the pressing of a material to be pressed to a component with a rotating pressing belt and control means, with which the course of the press belt is controlled. The control means comprise rolling rods and adjusting means with which the rolling rods can be adjusted obliquely to the transport direction of the press belt. The rolling rods are attached to chains on the side.

Der DE 198 247 23 C1 ist ein Verfahren zum Einstellen der Einlaufkontur des Einlaufmauls einer kontinuierlichen Presse zu entnehmen. Danach wird die obere Einlaufplatte des Einlaufmauls mittels Differäntialzylinder unter Bildung einer Einlaufkontur mit zumindest einer einlaufseitigen Mattenkontaktzone, einer sich in die Mattenkontaktzone anschließenden Matteneinspannzone und einer sich an die Matteneinspannzone anschlie-βenden Mattenverbindungszone verformt. Auf diese Weise werden Materialstau im Zuge der Materialverdichtung ebenso wie Ausblasungen selbst bei hohen Pressengeschwindigkeiten vermieden.Of the DE 198 247 23 C1 is a method for adjusting the inlet contour of the inlet mouth of a continuous press refer. Thereafter, the upper inlet plate of the inlet mouth is deformed by means of Differenzäntialzylinder to form an inlet contour with at least one inlet side mat contact zone, a subsequent in the mat contact zone Matteneinspannzone and a subsequent Matteneinspannzone Mattenverbindungszone. In this way, material accumulation in the course of material compaction as well as blowouts are avoided even at high press speeds.

Die Aufgabe der Erfindung besteht in der Bereitstellung eines Verfahrens sowie einer Vorrichtung, bei der einerseits das Pressband einer kontinuierlichen Presse den gewünschten Verlauf im Pressbereich verbessert einhält und andererseits die Produktqualität nicht in der vorgenannten Weise beeinträchtigt wird.The object of the invention is to provide a method and a device in which, on the one hand, the press belt of a continuous press maintains the desired course in the press area and, on the other hand, the product quality is not impaired in the aforementioned manner.

Die Aufgabe der Erfindung wird durch eine Vorrichtung mit den Merkmalen des ersten Anspruchs gelöst. Ein Verfahren zur Lösung des Problems umfasst die Merkmale des Nebenanspruchs.The object of the invention is achieved by a device having the features of the first claim. A method of solving the problem comprises the features of the independent claim.

Erfindungsgemäß wird Insbesondere vermieden, den Druck der Rollstäbe zu verändern, mit denen die Rollstäbe auf das Pressband drücken. Statt dessen werden die Rollstäbe lediglich hinsichtlich ihrer Lage in der Ebene ausgerichtet, die parallel zum Pressband verläuft. Im Grundzustand sind die Rollstäbe im Idealzustand senkrecht zur Laufrichtung des Pressbandes ausgerichtet. Weicht ein Pressband unerwünscht vom Sollverlauf ab, so werden die Rollstäbe relativ zum Pressband aus dieser senkrechten Lage derart herausgedreht, dass hierdurch eine Gegenwirkung erzielt wird und das Pressband zum Sollverlauf zurückkehrt. Hierdurch wird erreicht, dass das Pressband in die gewünschte Lage zurückgeführt wird bzw. den gewünschten Verlauf nimmt. Dabei ist es nicht erforderlich, den Druck zu verändern, den die Rollstäbe auf das Pressband ausüben. Hierdurch wird eine gleich bleibende Produktqualität erzielt.According to the invention, it is particularly avoided to change the pressure of the rolling rods with which the rolling rods press on the press belt. Instead, the rolling rods are merely aligned with respect to their position in the plane which is parallel to the press belt. In the ground state, the rolling rods are aligned in the ideal state perpendicular to the direction of the press belt. If a press belt deviates undesirably from the desired course, then the rolling rods are unscrewed from this vertical position relative to the press belt in such a way that a counteraction is achieved and the press belt returns to the desired course. This ensures that the press belt is returned to the desired position or takes the desired course. It is not necessary to change the pressure exerted by the rolling rods on the press belt. As a result, a consistent product quality is achieved.

Eine Vorrichtung zur Durchführung des Verfahrens umfasst in einer vorteilhaften Ausführungsform Messeinrichtungen zur Erfassung des Verlaufs des Pressbandes innerhalb des Pressbereiches. Die Vorrichtung umfasst ferner eine Steuerungseinrichtung bzw. Steuerungsmittel, um in Abhängigkeit vom gemessenen Verlauf des Bandes die Lage der Rollstäbe in vorgenannter Weise geeignet zu steuern.An apparatus for carrying out the method comprises in an advantageous embodiment measuring devices for detecting the course of the press belt within the pressing area. The device further comprises a control device or control means in order to suitably control the position of the rolling rods in the aforementioned manner as a function of the measured course of the belt.

Als Messfühler zur Kontrolle des Bandverlaufs wird insbesondere ein mechanischer Fühler eingesetzt. Dieser umfasst In einer besonders einfachen Ausführungsform ein Ende mit einer Rolle, die an das Band angrenzt. Der Fühler wird mechanisch verschoben, sobald das Band die Lage verändert. Die mechanische Veränderung wird registriert und der Steuerungseinrichtung zugeführt. Mittels der Steuerungseinrichtung wird die Lage der Zahnräder geeignet verändert, über die die Ketten geführt werden. Die Steuerung erfolgt über typischerweise über Servozylinder mit einem maximalen Hub von bevorzugt wenigstens ± 1 mm. In der Regel wird jedoch im Zehntelmillimeterbereich gesteuert, um den Bandverlauf geeignet zu korrigieren. Ein kleinerer Hub von mehr als 1/10 Millimeter kann daher grundsätzlich bereits ausreichend sein.As a sensor for controlling the course of the belt, a mechanical sensor is used in particular. In a particularly simple embodiment, this comprises an end with a roller which adjoins the band. The sensor is shifted mechanically as soon as the belt changes position. The mechanical change is registered and fed to the control device. By means of the control device, the position of the gears is suitably changed over which the chains out become. The control takes place via typically via servo cylinder with a maximum stroke of preferably at least ± 1 mm. In general, however, is controlled in tenths of a millimeter range to properly correct the band history. A smaller stroke of more than 1/10 millimeter can therefore already be sufficient in principle.

Wie bereits geschildert, befinden sich die Rollstäbe bevorzugt links und rechts an einer Kette bzw. sind an zwei Ketten befestigt. Die Ketten werden über Zahnräder angetrieben. Es gibt Zahnräder, die dafür zuständig sind, dass die Rollstäbe an das jeweilige Band angrenzen. Weitere Zahnräder sind in einer anderen Ebene vorgesehen. Diese Zahnräder dienen u.a. zur Spannung der Kette.As already described, the rolling rods are preferably left and right on a chain or are attached to two chains. The chains are driven by gears. There are gears that are responsible for the fact that the rolling rods are adjacent to the respective band. Other gears are provided in a different plane. These gears serve u.a. to tension the chain.

Die Kettenglieder sind produktionsbedingt oder aufgrund von Materialermüdungserscheinungen unerwünscht unterschiedlich lang. Bei einer Kette kann es daher passieren, dass einzelne Kettenglieder beispielsweise während des Betriebes unerwünscht gedehnt worden sind. Eine solche unerwünschte Dehnung führt zu einem Herauslaufen des Transportbandes vom gewünschten Sollverlauf nach links oder nach rechts in oben genannter Weise. Unterschiedlich lange Kettenglieder führen also zu Produktionsstörungen.The links are due to production or due to material fatigue, undesirably different lengths. In the case of a chain it may therefore happen that individual chain links have been undesirably stretched during operation, for example. Such unwanted stretching leads to a running out of the conveyor belt from the desired target curve to the left or to the right in the manner mentioned above. Differently long chain links thus lead to production disruptions.

Im Bereich des Einlaufs bestimmt die Lage der Einführwelle die Lage der Rollstäbe. Hier ist also sichergestellt, dass die Rollstäbe senkrecht zum Pressband liegen und somit ein Pressband zunächst zutreffend gesteuert wird. Insbesondere im mittleren Bereich kann sich die vorgenannte, an für sich gewünschte senkrechte Lage der Rollstäbe z. B. infolge gedehnter kettenglieder verändern. Dieses unerwünschte Abweichen von der senkrechten Lage tritt besonders stark dann auf, wenn nicht verpresst wird. Aufgrund gedehnter Kettenglieder können also im mittleren Bereich Rollstäbe "schräg" liegen. Dies bedeutet, die Rollstäbe bzw. Rollkörper sind nicht senkrecht zur Transportrichtung, In der das Pressband transportiert, ausgerichtet.In the area of the inlet, the position of the insertion shaft determines the position of the rolling rods. So here it is ensured that the rolling rods are perpendicular to the press belt and thus a press belt is initially controlled properly. In particular, in the central region, the aforementioned, in itself desired vertical position of the rolling rods z. B. due to stretched chain links change. This undesirable deviation from the vertical position occurs particularly strong when not pressed. Due to stretched chain links can therefore be "slanted" in the central area rolling rods. This means that the rolling rods or rolling elements are not perpendicular to the transport direction in which the press belt transported aligned.

Das Pressgut wird vielfach größerer Geschwindigkeit, typischerweise mit doppelter Geschwindigkeit in die Presse hineingefahren im Vergleich zur Transportgeschwindigkeit der Rollstäbe. Dies kann zur Folge haben, dass das Pressgut in einen Bereich der Presse gelangt, wo die Rollstäbe im vorgenannten Sinne schräg verlaufen. In dem Moment würde die unerwünschte Schrägstellung bewirken, dass das Pressband den gewünschten vorgesehenen Verlauf verläst. Das vorgenannte Problem tritt nur im Fall des Anfahrens eines Presszyklusses auf.The material to be pressed is fed into the press much faster, typically at twice the speed, compared to the transport speed of the rolling rods. This can have the consequence that the pressed material reaches an area of the press where the rolling rods are inclined in the aforementioned sense. At that moment, the undesired skew would cause the press belt to deflate the desired intended course. The aforementioned problem occurs only in the case of starting a press cycle.

Zu Beginn eines Pressvorgangs bzw. Presszyklusses ist daher darauf zu achten, dass dieser startet, wenn kein Herauslaufen des Bandes aufgrund schräg liegender Rollstäbe zum Beispiel aufgrund von unterschiedlich langen Gliedern einer Kette zu erwarten ist.At the beginning of a pressing process or pressing cycle, therefore, care must be taken to ensure that it starts when no run-out of the belt is to be expected due to slanted rolling rods, for example because of links of different length of a chain.

Erfindungsgemäß wird nun ermittelt, inwiefern ein schräger Verlauf bzw. eine schräge Lage von Rollstäben zum Beispiel aufgrund von unerwünscht gedehnten Kettengliedern zu erwarten ist. Diese Störeinflüsse werden bei der Steuerung berücksichtigt. Vor einem Anfahren wird also ermittelt, wann und wo eine Schrägstellung zum Beispiel aufgrund gedehnter Kettenglieder zu erwarten ist. In Abhängigkeit hiervon wird die Lage der Einführwelle(n) mit den daran befindlichen Zahnrädern gesteuert, über die die vorgenannten Ketten verlaufen. Auf diese Weise ist es möglich, zu einem beliebigen Zeitpunkt einen Presszyklus zu beginnen. Dies führt zu Beschleunigungen beim Anfahren eines Verpressens gegenüber dem Stand der Technik.According to the invention it is now determined to what extent an oblique course or an oblique position of rolling rods is to be expected, for example, due to undesirable stretched chain links. These interferences are taken into account in the control. Before starting, it is thus determined when and where an inclination is to be expected, for example due to stretched chain links. In response, the position of the feed shaft (s) is controlled with the gears located thereon over which the aforementioned chains pass. In this way it is possible to start a pressing cycle at any time. This leads to accelerations when starting a pressing compared to the prior art.

Gedehnte Kettenglieder können mittelbar oder unmittelbar ermittelt werden.Stretched chain links can be determined directly or indirectly.

Mittelbar können sie zum Beispiel ermittelt werden, Indem empirisch festgestellt wird, wie das Pressband verläuft. Über den Bandverlauf kann dann eine Aussage über gedehnte Kettenglieder getroffen werden bzw. es kann direkt empirisch ermittelt werden, wie die Eingangswelle auszurichten ist, um Störungen aufgrund von unterschiedlich langen Kettengliedern,zu vermeiden.They can be determined indirectly, for example, by determining empirically how the press belt runs. About the band history then a statement about stretched chain links can be made or it can be determined directly empirically how to align the input shaft is to avoid interference due to different length chain links.

Die Länge von Kettengliedern kann natürlich auch unmittelbar gemessen werden. Dies ist jedoch sehr aufwändig, da die Messung im Ruhezustand durchgeführt werden muss. Es kommt auf Unterschiede im Zehntelmillimeterbereich an. Hundertselmillimeterbereiche spielen ebenfalls eine Rolle. Eine Kette kann ohne Weiteres 100 m lang sein. Der messtechnische Aufwand ist also sehr groß, um die Länge eines jeden Gliedes der Kette durch Nachmessen zu bestimmen. Diese Vorgehensweise wird daher in der Regel nicht durchgeführt. Grundsätzlich kann jedoch auch direkt gemessen werden.Of course, the length of chain links can also be measured directly. However, this is very expensive, since the measurement must be performed at rest. It depends on differences in the tenth of a millimeter range. Hundredselmillimeterbereiche also play a role. A chain can easily be 100 m long. The metrological effort is therefore very large, to determine the length of each link of the chain by retiming. This procedure is therefore usually not performed. In principle, however, it is also possible to measure directly.

Eine weitere Messmethode besteht darin, bei den Eingangswellen bzw. bei den Zahnrädern eine optische Markierung oder einen Impulsgeber vorzusehen, der beispielsweise elektrisch Impulse abgibt. Weisen beide Ketten gleich lange Kettenglieder auf, so gibt es kein Auseinanderlaufen der Impulsgeber oder Markierungen relativ zueinander. Diese übermitteln an je einen Sensor stets zum gleichen Zeitpunkt einen Impuls bzw. zwei Sensoren messen die Markierungen zum gleichen Zeitpunkt. Gibt es Unterschiede bei den Ketten aufgrund von unterschiedlichen Kettenlängen, so registrieren die Sensoren die Impulse bzw. Markierungen zu unterschiedlichen Zeitpunkten. Hieraus können Unterscheide der Glieder einer Kette ermittelt, so zum Beispiel berechnet werden. Dies kann als Eingangsgröße Verwendet werden, um die erfindungsgemäße Steuerung vorzunehmen. Durch die Steuerung werden Kettenfehler, also unterschiedliche Längen bei den Kettengliedern, ausgeglichen. Die Produktion kann so gegenüber dem Stand der Technik beschleunigt und/ oder die Produktqualität verbessert werden.Another measuring method is to provide an optical marking or a pulse generator at the input shafts or at the gears, which emits electrical pulses, for example. If both chains have the same length chain links, there is no divergence of the pulse generators or markings relative to each other. These always transmit one pulse to one sensor at a time or two sensors measure the markings at the same time. If there are differences in the chains due to different chain lengths, the sensors register the pulses or markings at different times. From this differences of the links of a chain can be determined, for example calculated. This can be used as input to make the control according to the invention. The control compensates for chain errors, ie different lengths of the chain links. The production can be accelerated compared to the prior art and / or the product quality can be improved.

in einer weiteren Ausgestaltung der Erfindung werden vorteilhaft Zahnräder eingesetzt, die ausschließlich der Messung bzw. der Vermessung der Kette dienen. Diese zusätzlichen Zahnräder weisen Impulsgeber oder optische Markierungen auf. Die Zahnräder werden Insbesondere paarweise hintereinander eingesetzt. Diese weisen einen sehr geringen Abstand zueinander auf von z. B. 1000 mm. Die Zeiten der Impulsgeber werden miteinander verglichen. Resultierende Abweichungen geben Informationen über resultierende Abweichungen der vorgesehenen Kettenlänge bzw. Kettengliederlänge. Ferner wird hierdurch unmittelbar die Schrägstellung der Rollstäbe im Pressbereich ermittelt. Es werden also insgesamt vier Zahnräder eingesetzt. Bevorzugt befinden sich diese im Rücklaufbereich, um den eigentlichen Produktionsprozess keinesfalls zu beeinflussen. Im Press- bzw. Produktionsbereich können nämlich ermittelte Informationen fehlerhaft sein, da die Druckeinflüsse das Ergebnis verfälschen können,In a further embodiment of the invention, gears are used which serve exclusively for measuring or measuring the chain. These additional gears have pulser or optical markers. The gears are paired in particular inserted one behind the other. These have a very small distance from each other of z. B. 1000 mm. The times of the pulse generators are compared with each other. Resulting deviations provide information about resulting deviations of the intended chain length or chain link length. Furthermore, this directly determines the inclination of the rolling rods in the pressing area. So there are a total of four gears used. Preferably, these are located in the return area in order to influence the actual production process under any circumstances. In fact, information obtained in the press or production sector can be erroneous because the effects of pressure can falsify the result,

Ein gegenüber liegendes Paar an Zahnrädern mit Impulsgebern bzw. optischen Markierungen, dient insbesondere zur präzisen Ermittlung der Lage eines Rollstabes. Hintereinander in Laufrichtung angeordnete Zahnräder dienen bevorzugt der genauen Ermittlung von Längen der Kettenglieder.An opposite pair of gears with encoders or optical markers, in particular for precise determination of the position of a rolling rod. Cogwheels arranged one behind the other in the direction of travel preferably serve for the exact determination of lengths of the chain links.

Die Erfindung vermag also zwei Probleme zu lösen:

  1. 1. Es kann ein Problem während des Produktionsprozesses, also während des Verpressens gelöst werden, weiche eingangs im Stand der Technik bereits genannt worden ist.
  2. 2. Ein zweites Problem, welches beim Anfahren einer Pressvorrichtung auftritt, wird In einer Ausgestaltung der Erfindung gelöst.
The invention is thus able to solve two problems:
  1. 1. A problem can be solved during the production process, that is, during the compression, which has already been mentioned in the prior art.
  2. 2. A second problem which occurs when starting a pressing device is achieved in one embodiment of the invention.

insbesondere wird die Erfindung bei der Produktion von Laminatfußböden eingesetzt. Ein Laminatfußboden umfasst eine Platte vorzugsweise aus einem Holzwerkstoff wie z. B. HDF, MDF oder eine Spanplatte. Oberhalb und unterhalb eines solchen Trögermaterials werden Papiere angebracht. Auf der einen Seite ist ein Dekorpapier vorgesehen, welches die Optik des Fußbodens bestimmt. Auf der anderen Seite ist ein Gegenzugpapier vorgesehen, welches verhindert, dass sich die Platte im Anschluss an das Pressen verzieht. Oberhalb des Dekorpapiers befindet sich eine abriebfeste Schicht, um den Fußboden gegen Abrieb zu schützen. Unterhalb kann noch eine Schicht aus Schall dämmendem Material vorgesehen werden.In particular, the invention is used in the production of laminate flooring. A laminate floor comprises a plate preferably made of a wood material such. As HDF, MDF or chipboard. Above and below such a truss material papers are attached. On the one hand a decorative paper is provided, which determines the appearance of the floor. On the other hand, a Gegenzugpapier is provided, which prevents the plate warps after pressing. Above the decorative paper is an abrasion-resistant layer to protect the floor against abrasion. Below can still be provided a layer of sound-insulating material.

'Erfindungsgemäß' werden vorteilhaft seitliche Bereiche des Pressbandes im Pressbereich geeignet abgebremst oder beschleunigt, um so den Verlauf des Pressbandes zu steuern.Advantageously, according to the invention, lateral areas of the press belt in the pressing area are braked or accelerated in order to control the course of the press belt.

Ausführungsbeispielembodiment

Die Figur 1 skizziert eine kontinuierliche Presse für die Herstellung von MDF-, HDF- oder Spanplatten und dergleichen. Zwei aus Stahl bestehendie Pressbänder 1 werden um Walzen 2 herum geführt. Drehbar gelagerte Stäbe 3, die Rollstäbe genannt werden, sind bandartig miteinander über ketten 4 verbunden. Die Ketten 4 werden durch nicht dargestellte Zahnräder angetrieben. Die Zahnrädern befinden sich an den Enden von Eingangswellen 5 und Ausgangswellen 6. Das aus den Rollstäben 3 gebildete Band wird um die vorgenannten Wellen 5 und 6 herum geführt und zwar in der Regel mit einer deutlich geringeren Geschwindigkeit als die Geschwindigkeit, mit der die Pressbänder 1 um die Walzen 2 herum geführt werden. Dies hat zur Folge, dass die drehbar gelagerten Rollstäbe sich drehen.The FIG. 1 outlined a continuous press for the production of MDF, HDF or chipboard and the like. Two steel press belts 1 are passed around rollers 2. Rotatably mounted rods 3, called rolling rods, are connected to each other in a band-like manner via chains 4. The chains 4 are driven by gears, not shown. The gears are located at the ends of input shafts 5 and output shafts 6. The band formed from the rolling rods 3 is guided around the aforementioned shafts 5 and 6, and as a rule at a speed significantly lower than the speed with which the press belts 1 are guided around the rollers 2 around. This has the consequence that the rotatably mounted rolling rods rotate.

Das zu verpressende Gut wird entlang des Pfeils 7 in die Presse transportiert. Das Verpressen erfolgt dann in dem Bereich, an den die Rollstäbe grenzen.The material to be pressed is transported along the arrow 7 in the press. The pressing then takes place in the area to which the rolling rods border.

Figur 2 zeigt eine Aufsicht auf die Rollstäbe 3. Diese sind senkrecht zur Transportrichtung 7 angeordnet. FIG. 2 shows a plan view of the rolling rods 3. These are arranged perpendicular to the transport direction 7.

In der Figur 3 wird In Aufsicht der Fall gezeigt, dass eine Gruppe von Rollstäben 3a aufgrund unterschiedlich langer Kettenglieder der Ketten 4 nicht exakt senkrecht zur Transportrichtung ausgerichtet ist. Diese schräge Lage bewirkt eine unerwünschte Abweichung des Pressbandes vom Sollverlauf, wenn dieser schräg ausgerichtete Rollstab auf das Pressband drückt, um Druck auf das Pressgut zu übertragen.In the FIG. 3 is shown in plan the case that a group of rolling rods 3a is not aligned exactly perpendicular to the transport direction due to different lengths of chain links of the chains 4. This oblique position causes an undesirable deviation of the press belt from the desired course, when this obliquely oriented roll bar presses on the press belt to transfer pressure on the pressed material.

Dieser Abweichung wird erfindungsgemäß entgegengewirkt, Indem beispielsweise die in Figur 3 nicht dargestellte Ausgangswelle vorrübergehend entgegengesetzt schräg ausgerichtet wird, also gemäß Figur 3 an der rechten Seite in Richtung des Pfeils 8 verschoben wird, um so die Schräglage des Rollstabes 3a zu kompensieren.This deviation is counteracted according to the invention FIG. 3 Not shown output shaft is temporarily oriented obliquely opposite, so according to FIG. 3 on the right side in the direction of the arrow 8, so as to compensate for the inclination of the rolling rod 3a.

Diese Kompensation dient dazu, einen Presszyklus anfahren zu können, ohne auf Einflüsse von unterschiedlich langen Kettengliedern achten zu müssen. Unabhängig hiervon werden Eingangs- und Ausgangswellen oder andere geeignete Wellen und dergleichen kontinuierlich in Abhängigkeit vom Verlauf des Pressbandes derart ausgerichtet, dass der Sollverlauf des Pressbandes verbessert eingehalten wird.This compensation serves to be able to approach a press cycle, without having to pay attention to influences of different length chain links. Independently of this, input and output shafts or other suitable shafts and the like are continuously aligned in dependence on the course of the press belt such that the desired course of the press belt is maintained in an improved manner.

Um Unterschiede bei den Kettengliedern einer Kette 4 ermitteln zu können, sind in einer Ausführungsform beispielsweise zwei Zahnräder 9 hintereinander angeordnet und mit Markierungen oder Impulsgebern 10 versehen. Nicht dargestellte Sensoren registrieren die Markierungen beispielsweise in der gezeigten "Drei-Uhr"-Position. Solange die beiden Markierungen 10 zeitgleich von den Sensoren registriert werden, gibt es keine unterschiedlich lange Kettenglieder. Erst wenn zwischen die beiden Zahnräder eine Kettenglied gelangt, welches gegenüber den anderen beispielsweise gedehnt ist, werden die Markierungen zu unterschiedlichen Zeitpunkten registriert. Anhand der Drehgeschwindigkeit der Zahnräder und der zeitlichen Differenz kann dann die Abweichung hinsichtlich der Länge des Kettenglieds ermittelt werden. Dies Information wird zur Steuerung der Ausrichtung der Rollstäbe genutzt.In order to be able to determine differences in the chain links of a chain 4, in one embodiment, for example, two gears 9 are arranged one behind the other and provided with markers or pulse generators 10. Not shown sensors register the markers, for example in the "three o'clock" position shown. As long as the two markers 10 are registered at the same time by the sensors, there are no chain links of different lengths. Only when between the two gears a chain link arrives, which is stretched over the other, for example, the markers are registered at different times. Based on the rotational speed of the gears and the time difference can then be determined the deviation in the length of the chain link. This information is used to control the orientation of the rolling rods.

Anhand der Figur 5 wird in einer Aufsicht verdeutlicht, wie der Verlauf des Pressbandes bzw. Abweichungen vom Sollverlauf ermittelt werden kann. Drehbar gelagerte Rädchen 11 werden mittels Federkraft in Richtung an den jeweiligen Rand des Pressbandes gedrückt. Sie können ferner entlang des Doppelpfeils 12 verschoben werden. Ein Wegaufnehmer 13 vermag diese Bewegung entlang des Doppelpfeils 12 zu erfassen.Based on FIG. 5 is clarified in a plan, as the course of the press belt or deviations from the desired course can be determined. Rotatable wheels 11 are pressed by spring force in the direction of the respective edge of the press belt. You can also go along of the double arrow 12 are moved. A displacement sensor 13 is able to detect this movement along the double arrow 12.

Weicht das Pressband 1 vom Sollverlauf ab, so bewegen sich die Rädchen 11 entsprechend entlang des Doppelpfeils 12. Der jeweilige Wegaufnehmer 13 erfasst die Veränderung. Die Veränderung gibt unmittelbar die Abweichung vom Sollverlauf wieder.If the press belt 1 deviates from the desired course, the wheels 11 move accordingly along the double arrow 12. The respective displacement sensor 13 detects the change. The change directly reflects the deviation from the target course.

Der erfasste Veränderung wird an eine Elektronik übermittelt. Diese steuert nun in Reaktion hierauf die Schrägstellung entsprechender Rollstäbe, bis der Sollverlauf wieder hergestellt ist.The detected change is transmitted to an electronic system. This now controls in response to the inclination of corresponding rolling rods until the desired course is restored.

Claims (6)

  1. Press for pressing a material to be pressed into a component, said press having at least one revolving pressing belt (1) as well as control means, with which the course of the pressing belt is controlled, in which the control means comprise rotating rods (3), as well as positioning means, with which the rotating rods can be positioned diagonally relative to the direction of transport (7) of the pressing belt, in which the rotating rods (3) are laterally attached to revolving chains (4), characterized by means, that control the position of the rotating rods, dependent on the length of individual chain links of the chain (4).
  2. Press according to one of the preceding claims, in which the rotating rods (3) form a revolving belt, which is guided around shafts (5, 6) and in which positioning means are provided, with which shafts (5, 6) can be positioned diagonally relative to the direction of transport (7) of the pressing belt.
  3. Press according to one of the preceding claims, in which two revolving belts (1) are guided around rollers (2) and which are urged towards each other in an area between the rollers (2) namely in particular by means of pivoted rotating rods (3).
  4. Press according to one of the preceding claims, in which means (11,13) are provided, with which a deviation of the pressing belt (1) from a predefined desired course can be acquired, and an electronic system connected thereto capable of operating the positioning means, in case of deviations having been detected, in such a way that rotating rods (3) are deflected from their perpendicular position relative to the direction of movement (7) of the adjoining area of the pressing belt in such a way that the deviations are reduced.
  5. Press according to the preceding claim, in which gear wheels (9) are provided with markings or pulse generators (10) in which sensors together with an evaluation device are arranged such that stretched chain links of a chain (4) can be detected.
  6. Method for controlling a pressing belt (1) in a press according to one of the preceding claims, in which the course of the pressing belt is controlled in the pressing area by laterally slowing down or accelerating the press belt.
EP03732392A 2003-05-02 2003-05-16 Press comprising a correction of a press band course and method of controlling a press band Expired - Lifetime EP1620251B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20306758U DE20306758U1 (en) 2003-05-02 2003-05-02 Press with correction of a press belt course
PCT/EP2003/005140 WO2004096531A1 (en) 2003-05-02 2003-05-16 Press comprising a correction of a press band course

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EP1620251A1 EP1620251A1 (en) 2006-02-01
EP1620251B1 true EP1620251B1 (en) 2012-03-14

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EP (1) EP1620251B1 (en)
KR (1) KR20060005377A (en)
CN (1) CN100469564C (en)
AT (1) ATE549154T1 (en)
AU (1) AU2003240256A1 (en)
CA (1) CA2523202A1 (en)
DE (1) DE20306758U1 (en)
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CN102490245B (en) * 2011-12-22 2014-01-22 三门峡市易兴人造板设备有限公司 Dual-steel-belt continuous flat press
PL3305513T3 (en) * 2016-10-06 2020-03-31 SWISS KRONO Tec AG Wood material panel pressing device and method for monitoring a wood material panel pressing device
DE102017119300A1 (en) * 2017-08-23 2019-02-28 Iwis Antriebssysteme Gmbh & Co. Kg Device and method for determining the state of wear of a chain
DE102017119301A1 (en) * 2017-08-23 2019-02-28 Iwis Antriebssysteme Gmbh & Co. Kg Device and method for determining the state of wear of a chain

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CN1771120A (en) 2006-05-10
WO2004096531A1 (en) 2004-11-11
ATE549154T1 (en) 2012-03-15
RU2319613C2 (en) 2008-03-20
US7340997B2 (en) 2008-03-11
CA2523202A1 (en) 2004-11-11
RU2005132398A (en) 2006-08-27
EP1620251A1 (en) 2006-02-01
PL206191B1 (en) 2010-07-30
AU2003240256A1 (en) 2004-11-23
CN100469564C (en) 2009-03-18
US20060246168A1 (en) 2006-11-02
PL377930A1 (en) 2006-02-20
KR20060005377A (en) 2006-01-17

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