WO2002000422A1 - Double-band press - Google Patents

Double-band press Download PDF

Info

Publication number
WO2002000422A1
WO2002000422A1 PCT/EP2001/005980 EP0105980W WO0200422A1 WO 2002000422 A1 WO2002000422 A1 WO 2002000422A1 EP 0105980 W EP0105980 W EP 0105980W WO 0200422 A1 WO0200422 A1 WO 0200422A1
Authority
WO
WIPO (PCT)
Prior art keywords
press
roller
double belt
belts
support
Prior art date
Application number
PCT/EP2001/005980
Other languages
German (de)
French (fr)
Inventor
Bernd Heimes
Original Assignee
Metso Paper, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Metso Paper, Inc. filed Critical Metso Paper, Inc.
Priority to AU63940/01A priority Critical patent/AU6394001A/en
Publication of WO2002000422A1 publication Critical patent/WO2002000422A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/24—Moulding or pressing characterised by using continuously acting presses having endless belts or chains moved within the compression zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/28—Arrangements for preventing distortion of, or damage to, presses or parts thereof
    • B30B15/281—Arrangements for preventing distortion of, or damage to, presses or parts thereof overload limiting devices
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2711/00—Use of natural products or their composites, not provided for in groups B29K2601/00 - B29K2709/00, for preformed parts, e.g. for inserts
    • B29K2711/14—Wood, e.g. woodboard or fibreboard

Definitions

  • the invention relates to a double belt press of the type corresponding to the preamble of claim 1.
  • Such double belt presses are known from DE 21 57 746 C3.
  • the inlet-side deflection rollers of the press belts are not at the same height, as seen in the direction of the plate strand. However, this is the case with the double belt presses of DE 37 25 383 C1 and DE 39 18 755 C2.
  • the generic double belt presses are mostly used for the production of chipboard and similar boards from various wood-like raw materials. It can be, for example, MDF boards, actual wood chipboard, boards pressed from straw of different provenance, OSB boards, LVL boards and the like.
  • the small-sized starting material for all of these plates is sprinkled onto the horizontal lower press belt (as in DE 21 57 746 C3) or a feed belt upstream of it (as in DE 37 25 383 C1 or DE 39 18 755 C2) and, if necessary, after a Pre-compression is fed to the actual press inlet, where there is vigorous further compression in the thickness ratio of 1: 4 to 1: 7 to the final thickness of the plate strand that forms.
  • the invention has for its object to avoid such destruction on the double belt press.
  • the actual press infeed i.e. At the beginning of the press section, the upstream roll experiences a certain load, which is monitored by the sensor device. If there is an over-scatter with the scatter or the mat or the stack of the starting material, i.e. a thickening of the starting material, the load on the roll rises above a certain predetermined threshold value, whereupon an alarm is triggered, for example the press is stopped immediately, so that the thickening does not get into the inlet of the press section and into it itself and there the can cause said destruction.
  • roll for the feed belt upstream of the inlet mouth is intended to include various alternatives.
  • the roller is nothing more than a front deflection roller of a press belt, in particular the upper press belt in a horizontal press.
  • the deflection roller takes part in the compaction and is not only exposed to the horizontal tensile forces of the press belt, but also to the vertical compaction forces, which increase sharply when approaching over-scattering and trigger the alarm via the
  • Trigger sensor device
  • support rollers are provided which can be adjusted against the free section of the press belt between the front deflection roller (in particular the upper one) and the inlet of the press section and whose contact forces can be detected.
  • the detection of these contact forces can be carried out in various ways known per se, for example by means of various force or pressure sensors or by means of strain gauges which are attached to the supports of the "roller" and which allow a conclusion to be drawn about the forces.
  • the preferred embodiment of the "alarm” consists in stopping the drive of the press belts according to claim 5.
  • rapid ventilation of at least the entrance area of the double belt press is also conceivable, but this is much more difficult to implement than stopping the double belt press.
  • 1 and 2 show partial side views of the inlet area of the double belt press.
  • the double belt press 100 of FIG. 1 comprises an upper press belt 1 and a lower press belt 2, which are horizontal in the mutually facing strands
  • the press belts 1, 2 each run endlessly over pairs of deflection rollers, one of which also takes over the drive and of which only the deflection rollers 4, 5 located in the inlet area are shown in the drawing, which in the exemplary embodiments lie in a vertical plane E. and a kind Form roll gap 20.
  • the strands of the press belts 1, 2 which delimit them are supported from the outside - seen perpendicular to their plane - by flat heating plates 6, 7, which in turn are deposited on a support structure (not shown) against the forces occurring.
  • rotating roller chains are provided, which are also not shown.
  • an inlet mouth 3 ' is formed, in which the heating plates 6, 7 gap somewhat.
  • Heating plate 6 'curved slightly upwards.
  • a bed 9 of small-sized starting material such as wood shavings or wood fibers is applied, which is compressed in the inlet area in the manner indicated in the drawing to a fifth or a sixth of its initial thickness.
  • the two deflecting rollers 4, 5 already take over a substantial part of the compression, which is then continued in the inlet mouth 3 '.
  • the bed 9 then runs into the actual pressing section 3, where the final calibration and curing of the starting material
  • the bed 9 may have so-called over-scattering, ie thickening of the bed occurring in certain local areas of the surface, in which more material is present and which is therefore more difficult to the extent given by the spacing of the forming strips 1, 2 perpendicular to their surface in the pressing section 3 are to be pressed together.
  • over-scattering ie thickening of the bed occurring in certain local areas of the surface, in which more material is present and which is therefore more difficult to the extent given by the spacing of the forming strips 1, 2 perpendicular to their surface in the pressing section 3 are to be pressed together.
  • the increase in force that occurs when the bed 9 is compressed to the predetermined thickness can damage the shaped belts 1, 2, the roller chains supporting them in the pressing section 3, the heating plates 6, 7 and the deflecting drums 4, 5, which, too get the drive of the press belts 1, 2.
  • the forces occurring are monitored in the entrance area of the press.
  • the press belts 1, 2 run essentially freely, ie without external support, and are accordingly exposed to the forces of the bed 9.
  • 2 support rollers 16, 17 are arranged under the press belt, opposite which support rollers 18, 19, which act from the outside on the upper press belt 1, are located at the same point, as seen in the running direction of the strand 10.
  • the support rollers 16, 18 and 17, 19 each form a type of roll gap between them, in which the material of the bed 9 is additionally compressed between the deflection rollers 4, 5 and the inlet mouth 3 '.
  • the compression takes place by means of hydraulic piston / cylinder units 20, 20, which experience a certain pressure when the double belt press 200 runs normally. If over-scattering occurs, the back pressure of the bed 9 larger and a higher hydraulic pressure is required to hold the support rollers 18, 19 in the same place. This pressure increase is detected by pressure transducers 21, 21 and fed back via lines 11, 12 as an electrical signal to the force measuring device 13, which is connected via a line 14 to the control device 15, which triggers the emergency stop if necessary.
  • the deflection rollers 4, 5 are also vertically one above the other in the double belt press 200, although this would not be necessary here.
  • the deflecting roller 5 could therefore also be located further to the left, and the filling could be applied immediately to the press belt 2, which extends further to the left.
  • the forces in the gap 20 between the deflection rollers 4, 5 are used for control and the deflection rollers 4, 5 must therefore be arranged one above the other.

Abstract

The invention relates to a double-band press (200) for the production of particle board (200) and the like. A security device is provided to ensure that no damage is caused by high pressure points when bulk material (9) is introduced and sprinkled into the pressing section (3). The security device can include detection of the forces acting between superposed deflection rollers (4,5) when the support rollers (4, 5) are placed on top of each other on the intake side of the double-band press (100). It is, however, also possible to arrange additional hydraulically supported support rollers (18,19) between the deflection rollers (4, 5), which no longer need to be superposed, and the intake orifice (3'), and to use the pressure in the hydraulic support system to disconnect the drive of the press bands (1,2).

Description

Doppelbandpresse Double belt press
Die Erfindung bezieht sich auf eine Doppelbandpresse der dem Oberbegriff des Anspruchs 1 entsprechenden Art.The invention relates to a double belt press of the type corresponding to the preamble of claim 1.
Derartige Doppelbandpressen sind aus der DE 21 57 746 C3 bekannt. Die ein- laufseitigen Umlenkrollen der Pressenbänder liegen hierbei nicht in gleicher Höhe, in Laufrichtung des Plattenstrangs gesehen. Bei den Doppelbandpressen der DE 37 25 383 C1 und der DE 39 18 755 C2 ist dies jedoch der Fall.Such double belt presses are known from DE 21 57 746 C3. The inlet-side deflection rollers of the press belts are not at the same height, as seen in the direction of the plate strand. However, this is the case with the double belt presses of DE 37 25 383 C1 and DE 39 18 755 C2.
Die gattungsgemäßen Doppelbandpressen dienen meist zur Herstellung von Spanplatten und ähnlichen Platten aus den verschiedensten holzartigen Aus- gangsstoffen. Es kann sich zum Beispiel um MDF-Platten handeln, um eigentliche Holzspanplatten, um aus Stroh verschiedener Provenienz gepreßte Platten, um OSB-Platten, um LVL-Platten und dergleichen. Das kleinteilige Ausgangsmaterial für alle diese Platten wird auf das horizontale untere Pressenband (wie bei der DE 21 57 746 C3) oder ein diesem vorgeschaltetes Zuführband (wie bei der DE 37 25 383 C1 oder der DE 39 18 755 C2) aufgestreut und gegebenenfalls nach einer Vorverdichtung dem eigentlichen Presseneinlauf zugeführt, wo eine kräftige Weiterkomprimierung im Dickenverhältnis von 1 : 4 bis 1 : 7 auf die Enddicke des sich bildenden Plattenstrangs stattfindet.The generic double belt presses are mostly used for the production of chipboard and similar boards from various wood-like raw materials. It can be, for example, MDF boards, actual wood chipboard, boards pressed from straw of different provenance, OSB boards, LVL boards and the like. The small-sized starting material for all of these plates is sprinkled onto the horizontal lower press belt (as in DE 21 57 746 C3) or a feed belt upstream of it (as in DE 37 25 383 C1 or DE 39 18 755 C2) and, if necessary, after a Pre-compression is fed to the actual press inlet, where there is vigorous further compression in the thickness ratio of 1: 4 to 1: 7 to the final thickness of the plate strand that forms.
Bei der Produktion der vorstehend genannten verschiedenartigen Platten kommt es immer wieder zu Streufehlern, d.h. es kommen auf der Plattenfläche lokale Überstreuungen vor, also Stellen erhöhter Menge an Ausgangsmaterial pro Flächeneinheit, die bei der Komprimierung auf ein festes Maß zu lokalen Druckerhö- hungen erheblichen Ausmaßes führen. Es kann dabei zu Zerströrungen an denIn the production of the above-mentioned different types of plates, scattering errors occur again and again, i.e. there are local over-scatterings on the plate surface, that is, places with an increased amount of starting material per unit area, which, when compressed to a fixed level, lead to considerable local pressure increases. This can lead to destruction of the
Pressenbändern, an den Heizplatten, an den Stützkonstruktionen und am Bewegungssystem kommen. Der Erfindung liegt die Aufgabe zugrunde, derartige Zerstörungen an der Doppelbandpresse zu vermeiden.Press belts, on the heating plates, on the support structures and on the movement system. The invention has for its object to avoid such destruction on the double belt press.
Diese Aufgabe wird durch die in Anspruch 1 wiedergegebene Erfindung gelöst.This object is achieved by the invention reproduced in claim 1.
Die dem eigentlichen Presseneinlauf, d.h. dem Beginn der Preßstrecke, vorgeschaltete Rolle erfährt eine bestimmte Belastung, die durch die Sensoreinrichtung überwacht wird. Kommt mit der Streuung bzw. der Matte oder dem Stapel des Ausgangsmaterials eine Überstreuung, d.h. eine Verdickung des Ausgangsmaterials, an, so steigt die Belastung der Rolle über einen bestimmten vorgegebenen Schwellenwert, worauf ein Alarm ausgelöst, zum Beispiel die Presse augenblicklich stillgesetzt wird, so daß die Verdickung nicht in den Einlauf der Preßstrecke und in diese selbst hineingeraten und dort die besagten Zerstörungen anrichten kann.The actual press infeed, i.e. At the beginning of the press section, the upstream roll experiences a certain load, which is monitored by the sensor device. If there is an over-scatter with the scatter or the mat or the stack of the starting material, i.e. a thickening of the starting material, the load on the roll rises above a certain predetermined threshold value, whereupon an alarm is triggered, for example the press is stopped immediately, so that the thickening does not get into the inlet of the press section and into it itself and there the can cause said destruction.
Der Ausdruck "Rolle" für das dem Einlaufmaul vorgeschaltete Zuführband soll verschiedene Alternativen umfassen.The term "roll" for the feed belt upstream of the inlet mouth is intended to include various alternatives.
Eine erste Alternative ist Gegenstand des Anspruchs 2: hierbei ist die Rolle nichts anderes als eine vordere Umlenkrolle eines Pressenbandes, insbesondere des oberen Pressenbandes bei einer horizontalen Presse. Die Umlenkrolle nimmt hierbei an der Verdichtung teil und ist nicht nur den horizontalen Zugkräften des Pressenbandes, sondern auch den vertikalen Verdichtungskräften ausgesetzt, die beim Herannahen einer Überstreuung stark ansteigen und den Alarm über dieA first alternative is the subject of claim 2: the roller is nothing more than a front deflection roller of a press belt, in particular the upper press belt in a horizontal press. The deflection roller takes part in the compaction and is not only exposed to the horizontal tensile forces of the press belt, but also to the vertical compaction forces, which increase sharply when approaching over-scattering and trigger the alarm via the
Sensoreinrichtung auslösen.Trigger sensor device.
Eine zweite Alternative für die "Rolle" ist in Anspruch 3 wiedergegeben.A second alternative for the "role" is given in claim 3.
Hierbei sind Stützrollen vorgesehen, die gegen den freien Abschnitt des Pressenbandes zwischen der vorderen Umlenkrolle (insbesondere der oberen) und dem Einlauf der Preßstrecke anstellbar sind und deren Anstellkräfte erfaßt werden können. Die Erfassung dieser Anstellkräfte kann auf verschiedene, für sich bekannte Weisen vorgenommen werden, zum Beispiel mittels diverser Kraft- oder Druckgeber oder mittels Dehnungsmeßstreifen, die an den Abstützungen der "Rolle" angebracht werden und über deren Dehnungen einen Schluß auf die Kräfte erlauben.Here, support rollers are provided which can be adjusted against the free section of the press belt between the front deflection roller (in particular the upper one) and the inlet of the press section and whose contact forces can be detected. The detection of these contact forces can be carried out in various ways known per se, for example by means of various force or pressure sensors or by means of strain gauges which are attached to the supports of the "roller" and which allow a conclusion to be drawn about the forces.
Wenn die Stützrolle jedoch hydraulisch anstellbar ist und die Sensoreinrichtung auf den hydraulischen Druck anspricht, ist eine besonders einfache Ausführungsform gegeben.However, if the support roller can be adjusted hydraulically and the sensor device responds to the hydraulic pressure, a particularly simple embodiment is provided.
Die bevorzugte Ausführungsform des "Alarms" besteht in der Stillsetzung des Antriebs der Pressenbänder gemäß Anspruch 5. Prinzipiell ist auch eine Schnellüf- tung zumindest des Eingangsbereichs der Doppelbandpresse denkbar, doch ist dies wesentlich schwieriger zu realisieren als das Anhalten der Doppelbandpres- se.The preferred embodiment of the "alarm" consists in stopping the drive of the press belts according to claim 5. In principle, rapid ventilation of at least the entrance area of the double belt press is also conceivable, but this is much more difficult to implement than stopping the double belt press.
In der Zeichnung sind die beiden vorstehend erwähnten Alternativen schematisch dargestellt.The two alternatives mentioned above are shown schematically in the drawing.
Fig. 1 und 2 zeigen seitliche Teilansichten des Einlaufbereichs der Doppelbandpressen.1 and 2 show partial side views of the inlet area of the double belt press.
Die Doppelbandpresse 100 der Fig. 1 umfaßt ein oberes Pressenband 1 und ein unteres Pressenband 2, die in den einander zugewandten Trums horizontal imThe double belt press 100 of FIG. 1 comprises an upper press belt 1 and a lower press belt 2, which are horizontal in the mutually facing strands
Sinn des Pfeils 22 gleichlaufend vorlaufen und zwischen sich eine Preßstrecke 3 bilden, die sich gegenüber der Darstellung nach Fig. 1 nach rechts noch um eine erhebliche Strecke fortsetzt.Advance sense of arrow 22 in the same direction and form a pressing section 3 between them, which continues to the right over a considerable distance compared to the illustration in FIG. 1.
Die Pressenbänder 1 ,2 laufen jeweils endlos über Paare von Umlenkrollen, von denen jeweils eine auch den Antrieb übernimmt und von denen in der Zeichnung nur jeweils die im Einlaufbereich gelegenen Umlenkrollen 4,5 dargestellt sind, die in den Ausführungsbeispielen in einer vertikalen Ebene E liegen und eine Art Walzspalt 20 bilden. Im Bereich der Preßstrecke 3 werden die diese begrenzenden Trume der Pressenbänder 1 ,2 von außen - senkrecht zu ihrer Ebene gesehen - durch ebene Heizplatten 6,7 abgestützt, die ihrerseits an einer nicht dargestellten Stützkonstruktion gegen die auftretenden Kräfte hinterlagert sind. Zur Verminderung der Reibung zwischen den Pressenbändern 1,2 und den Heizplatten 6,7 sind mitumlaufende Rollenketten vorgesehen, die ebenfalls nicht dargestellt sind.The press belts 1, 2 each run endlessly over pairs of deflection rollers, one of which also takes over the drive and of which only the deflection rollers 4, 5 located in the inlet area are shown in the drawing, which in the exemplary embodiments lie in a vertical plane E. and a kind Form roll gap 20. In the area of the press section 3, the strands of the press belts 1, 2 which delimit them are supported from the outside - seen perpendicular to their plane - by flat heating plates 6, 7, which in turn are deposited on a support structure (not shown) against the forces occurring. To reduce the friction between the press belts 1, 2 and the heating plates 6, 7, rotating roller chains are provided, which are also not shown.
Am Eingang der Preßstrecke ist ein Einlaufmaul 3' gebildet, in welchem die Heiz- platten 6,7 etwas aufklaffen. In dem gezeigten Ausführungsbeispiel ist die obereAt the entrance of the press section, an inlet mouth 3 'is formed, in which the heating plates 6, 7 gap somewhat. In the embodiment shown, the upper one
Heizplatte 6' etwas nach oben gewölbt.Heating plate 6 'curved slightly upwards.
Auf ein vorgeschaltetes Zuführband 8 wird eine Schüttung 9 aus kleinteiligem Ausgangsmaterial wie zum Beispiel Holzspänen oder Holzfasern aufgebracht, die in dem Einlaufbereich in der in der Zeichnung angedeuteten Weise auf ein Fünftel oder ein Sechstel ihrer Ausgangsdicke zusammengepreßt wird. In dem Ausführungsbeispiel der Fig. 1 übernehmen die beiden Umlenkrollen 4,5 bereits einen wesentlichen Teil der Zusammenpressung, die dann in dem Einlaufmaul 3' fortgesetzt wird. Die Schüttung 9 läuft dann in die eigentliche Preßstrecke 3 ein, wo die endgültige Kalibrierung und die Aushärtung des dem Ausgangsmaterial derOn an upstream feed belt 8, a bed 9 of small-sized starting material such as wood shavings or wood fibers is applied, which is compressed in the inlet area in the manner indicated in the drawing to a fifth or a sixth of its initial thickness. In the exemplary embodiment in FIG. 1, the two deflecting rollers 4, 5 already take over a substantial part of the compression, which is then continued in the inlet mouth 3 '. The bed 9 then runs into the actual pressing section 3, where the final calibration and curing of the starting material
Schüttung 9 beigefügten Bindemittels stattfinden.Filling 9 attached binder take place.
Die Schüttung 9 kann sogenannte Überstreuungen aufweisen, d.h. in bestimmten lokalen Bereichen der Oberfläche vorkommende Verdickungen der Schüttung, in denen mehr Material vorhanden ist und die daher schwerer auf das durch den Abstand der Formbänder 1 ,2 senkrecht zu ihrer Fläche in der Preßstrecke 3 gegebene Maß zusammenzudrücken sind. Im Extremfall kann die bei der Zusammendrückung der Schüttung 9 auf das vorgegebene Dickenmaß sich einstellende Krafterhöhung Schäden an den Formbändern 1,2, den diese in der Preßstrecke 3 abstützenden Rollenketten, an den Heizplatten 6,7 und den Umlenktrommeln 4,5 verursachen, die auch den Antrieb der Pressenbänder 1 ,2 besorgen. Um derartige Schäden zu vermeiden, werden im Eingangsbereich der Presse die auftretenden Kräfte überwacht. Bei der Ausführungsform 100 der Fig. 1 wird dies durch Überwachung der an der Umlenktrommel 4 auftretenden Vertikal kräfte K durchgeführt, denen die Lagerung der Umlenktrommel 4 und die die Lagerung tragende Stützkonstruktion zu widerstehen hat. Die Kräfte K werden durch geeignete Aufnehmer 23 gemessen, zum Beispiel solche, die auf Konstruktionsteile aufgeklebte elektrische Dehnungsmeßstreifen beinhalten. Es ergibt sich ein elektrisches Kraftsignal, welches über die Leitungen 11 ,12 einer die Signale auswertenden Kraftmeßeinrichtung 13 zugeführt wird, die wiederum über eine Leitung 14 an ein Steuergerät 15 angeschlossen ist, welches dafür Sorge trägt, daß beiThe bed 9 may have so-called over-scattering, ie thickening of the bed occurring in certain local areas of the surface, in which more material is present and which is therefore more difficult to the extent given by the spacing of the forming strips 1, 2 perpendicular to their surface in the pressing section 3 are to be pressed together. In an extreme case, the increase in force that occurs when the bed 9 is compressed to the predetermined thickness can damage the shaped belts 1, 2, the roller chains supporting them in the pressing section 3, the heating plates 6, 7 and the deflecting drums 4, 5, which, too get the drive of the press belts 1, 2. In order to avoid such damage, the forces occurring are monitored in the entrance area of the press. In the embodiment 100 of FIG. 1, this is carried out by monitoring the vertical forces K occurring on the deflection drum 4, which the bearing of the deflection drum 4 and the support structure supporting the bearing has to withstand. The forces K are measured by suitable transducers 23, for example those which contain electrical strain gauges glued to structural parts. The result is an electrical force signal, which is fed via lines 11, 12 to a force measuring device 13 evaluating the signals, which in turn is connected via a line 14 to a control device 15, which ensures that
Überschreitung eines bestimmten Schwellenwertes des Signals auf der Leitung 14 bzw. der Kraft K der Antrieb der Doppelbandpresse 100 augenblicklich stillgesetzt wird. Eine Überstreuung kann dadurch frühzeitig erfaßt und daran gehindert werden, in die eigentliche Preßstrecke 3, wo also dadurch die höchsten Kraftspitzen auftreten würden, einzudringen.Exceeding a certain threshold value of the signal on line 14 or the force K, the drive of the double belt press 100 is stopped immediately. As a result, over-scattering can be detected at an early stage and prevented from penetrating into the actual pressing section 3, where the highest force peaks would thus occur.
Bei der Doppelbandpresse 200 der Fig. 2 sind einander funktionell entsprechende Teile mit gleichen Bezugszahlen gekennzeichnet wie bei der Doppelbandpresse 100. In diesem Fall ist der horizontale Abstand zwischen der engsten Stelle zwi- sehen den Umlenkrollen 4,5 und dem Einlaufmaul 3' größer als bei der Doppelbandpresse 100. In der Abstandsstrecke laufen die Pressenbänder 1 ,2 im wesentlichen frei, d.h. ohne äußere Abstützung, und sind dementsprechend den Kräften der Schüttung 9 ausgesetzt. Um hier eine Abstützung zu schaffen, sind unter dem Pressenband 2 Stützrollen 16,17 angeordnet, denen an der gleichen Stelle - in Laufrichtung des Strangs 10 gesehen - Stützrollen 18,19 gegenüberliegen, die von außen auf das obere Pressenband 1 wirken. Die Stützrollen 16,18 und 17,19 bilden jeweils zwischen sich eine Art Walzspalt, in dem das Material der Schüttung 9 zwischen den Umlenkrollen 4,5 und dem Einlaufmaul 3' zusätzlich zusammengedrückt wird.In the double belt press 200 of FIG. 2, functionally corresponding parts are identified with the same reference numbers as in the double belt press 100. In this case, the horizontal distance between the narrowest point between the deflection rollers 4, 5 and the inlet mouth 3 'is greater than at the double belt press 100. In the spacing section, the press belts 1, 2 run essentially freely, ie without external support, and are accordingly exposed to the forces of the bed 9. In order to provide support here, 2 support rollers 16, 17 are arranged under the press belt, opposite which support rollers 18, 19, which act from the outside on the upper press belt 1, are located at the same point, as seen in the running direction of the strand 10. The support rollers 16, 18 and 17, 19 each form a type of roll gap between them, in which the material of the bed 9 is additionally compressed between the deflection rollers 4, 5 and the inlet mouth 3 '.
Die Zusammendrückung erfolgt mittels hydraulischer Kolben/Zylindereinheiten 20,20, die einen bestimmten Druck erfahren, wenn die Doppelbandpresse 200 normal läuft. Tritt eine Überstreuung auf, wird der Gegendruck der Schüttung 9 größer und bedarf es eines höheren hydraulischen Drucks, um die Stützrollen 18,19 an der gleichen Stelle zu halten. Diese Druckerhöhung wird von Druckmeßwandlern 21 ,21 erfaßt und über die Leitungen 11 ,12 als elektrisches Signal wieder der Kraftmeßeinrichtung 13 zugeleitet, die über eine Leitung 14 mit dem Steuerge- rät 15 verbunden ist, welches im Bedarfsfalle den Nothalt auslöst.The compression takes place by means of hydraulic piston / cylinder units 20, 20, which experience a certain pressure when the double belt press 200 runs normally. If over-scattering occurs, the back pressure of the bed 9 larger and a higher hydraulic pressure is required to hold the support rollers 18, 19 in the same place. This pressure increase is detected by pressure transducers 21, 21 and fed back via lines 11, 12 as an electrical signal to the force measuring device 13, which is connected via a line 14 to the control device 15, which triggers the emergency stop if necessary.
Die Umlenkrollen 4,5 liegen auch bei der Doppelbandpresse 200 vertikal übereinander, obwohl dies hierbei nicht erforderlich wäre. Es könnte also auch die Umlenkrolle 5 weiter links gelegen sein und die Aufbringung der Schüttung sogleich auf das sich weiter nach links erstreckende Pressenband 2 erfolgen. Bei der Doppelbandpresse 100 werden die Kräfte in dem Spalt 20 zwischen den Umlenkrollen 4,5 zur Steuerung benutzt und müssen also die Umlenkrollen 4,5 übereinander angeordnet sein. The deflection rollers 4, 5 are also vertically one above the other in the double belt press 200, although this would not be necessary here. The deflecting roller 5 could therefore also be located further to the left, and the filling could be applied immediately to the press belt 2, which extends further to the left. In the case of the double belt press 100, the forces in the gap 20 between the deflection rollers 4, 5 are used for control and the deflection rollers 4, 5 must therefore be arranged one above the other.

Claims

P A T E N T A N S P R Ü C H E PATENT CLAIMS
1. Doppelbandpresse (100,200) zur kontinuierlichen Herstellung von Holzspanplatten und ähnlichen strangförmigen Formkörpern, bei denen eine Schüttung (9) oder ein Paket eines losen, mit einem Bindemittel versetzten Ausgangsmaterials zwischen Preßflächen der Einwirkung von Druck und gegebenenfalls Wärme ausgesetzt wird, mit zwei zwischen je zwei Umlenkrollen (4,...) bzw. (5,...) endlos umlaufenden, die Preßflächen bildenden Pressenbändern (1 ,2) die in einer - in Laufrichtung (22) des Strangs (10) gesehen - zwischen den Umlenkpaaren (4,...) bzw. (5,...) der Pressenbänder (1 ) bzw. (2) gebildeten Preßstrecke (3) parallel zueinander mit gleicher, der Laufgeschwindigkeit des sich bildenden Strangs (10) entsprechender Geschwindigkeit vorlaufen, und mit - senkrecht zu den Pressenbändern (1 ,2) gesehen außerhalb deren die Preßstrecke (3) begrenzender Trume - angeordneten Stützkonstruktionen, an denen die Pressenbänder (1,2) in der Preßstrecke (3) gegen den für die Bildung des Strangs (10) notwendigen Druck abgestützt sind und die ein Einlaufmaul (3') aufweisen, in denen die Pressenbänder (1 ,2) - von der jeweiligen vorderen Umlenkrolle (4,5) kommend - mit der dazwischen befindlichen Schütttung (9) einlaufen, dadurch gekennzeichnet, daß mindestens eine dem Einlaufmaul (3') im Innern des jeweiligen Pressenbandes (1) bzw. (2) vorgelagerten Rolle mit einer ein der Belastung der jeweiligen Rolle entsprechendes Signal abgebenden Sensoreinrichtung (23,13;21 ,13) wirkungsverbunden ist, die an ein Steuergerät (15) angeschlossen ist, welches bei Überschreitung eines vorbestimmten Schwellen- signalwertes einen Alarm auslöst. 1. Double belt press (100,200) for the continuous production of chipboard and similar strand-shaped bodies, in which a bed (9) or a package of a loose, mixed with a binding material is exposed to the action of pressure and possibly heat between the pressing surfaces, with two between each two deflecting rollers (4, ...) or (5, ...) endlessly rotating press belts (1, 2) forming the pressing surfaces, which - seen in the running direction (22) of the strand (10) - between the deflecting pairs ( 4, ...) or (5, ...) of the press belts (1) or (2) formed press section (3) run parallel to each other at the same speed corresponding to the running speed of the strand (10) that is formed, and with - Seen perpendicular to the press belts (1, 2) outside of which the pressing section (3) delimiting dreams - arranged support structures on which the press belts (1,2) in the pressing section (3) against the for the formation d there necessary strands (10) are supported and which have an inlet mouth (3 ') into which the press belts (1, 2) - coming from the respective front deflection roller (4, 5) - enter with the bed (9) located between them , characterized in that at least one roller upstream of the inlet mouth (3 ') in the interior of the respective press belt (1) or (2) is functionally connected to a sensor device (23, 13; 21, 13) emitting a signal corresponding to the load on the respective roller is connected to a control device (15) which triggers an alarm when a predetermined threshold signal value is exceeded.
2. Doppelbandpresse nach Anspruch 1 , dadurch gekennzeichnet, daß die Rolle eine der vorderen Umlenkrollen (4,5) und die Sensoreinrichtung (23,13) mit der Lagerung derselben bzw. deren Abstützung wirkungsverbunden ist.2. Double belt press according to claim 1, characterized in that the roller is one of the front deflecting rollers (4, 5) and the sensor device (23, 13) with the bearing thereof or its support is operatively connected.
3. Doppelbandpresse nach Anspruch 1 , dadurch gekennzeichnet, daß die Rolle eine in dem Bereich zwischen den vorderen Umlenkrollen (4,5) und dem Einlaufmaul (31) vom Innern mindestens eines der Pressenbänder (1 ,2) her gegen dieses anstellbaren Stützrolle (18,19) ist und die Sensoreinrichtung (21 ,13) mit der Lagerung derselben bzw. deren Abstützung wirkungsverbunden ist.3. Double belt press according to claim 1, characterized in that the roller in the area between the front deflection rollers (4,5) and the inlet mouth (3 1 ) from the inside of at least one of the press belts (1, 2) against this adjustable support roller ( 18, 19) and the sensor device (21, 13) is functionally connected to the mounting thereof or its support.
4. Doppelbandpresse nach Anspruch 3, dadurch gekennzeichnet, daß die Stützrolle (18,19) hydraulisch anstellbar ist und die Sensoreinrichtung (21 ,13) auf den hydraulischen Druck anspricht.4. Double belt press according to claim 3, characterized in that the support roller (18, 19) can be adjusted hydraulically and the sensor device (21, 13) responds to the hydraulic pressure.
5. Doppelbandpresse nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Auslösung des Alarms die Stillsetzung des Antriebs der Pressenbänder (1,2) zur Folge hat. 5. Double belt press according to one of claims 1 to 4, characterized in that the triggering of the alarm results in the stopping of the drive of the press belts (1,2).
PCT/EP2001/005980 2000-06-28 2001-05-25 Double-band press WO2002000422A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU63940/01A AU6394001A (en) 2000-06-28 2001-05-25 Double-band press

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2000131551 DE10031551C2 (en) 2000-06-28 2000-06-28 Double belt press
DE10031551.8 2000-06-28

Publications (1)

Publication Number Publication Date
WO2002000422A1 true WO2002000422A1 (en) 2002-01-03

Family

ID=7647125

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2001/005980 WO2002000422A1 (en) 2000-06-28 2001-05-25 Double-band press

Country Status (3)

Country Link
AU (1) AU6394001A (en)
DE (1) DE10031551C2 (en)
WO (1) WO2002000422A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005049880B4 (en) * 2005-10-17 2017-06-08 Dieffenbacher GmbH Maschinen- und Anlagenbau Method for protecting the machine elements of a continuously operating press and continuous press for carrying out the method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10253657A1 (en) * 2002-11-16 2004-05-27 Maschinenfabrik J. Dieffenbacher Gmbh & Co Safety device for continuously working press has pressure detection elements in short press width section for resolving measurement signals from pressed material mat partial counter pressure forces

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3907473A (en) * 1972-04-07 1975-09-23 Baehre & Greten Continuous presses
US4029456A (en) * 1974-10-31 1977-06-14 Eduard Kusters Maschinenfabrik Rapid load-relieve device for continuous press
US5042372A (en) * 1989-06-08 1991-08-27 Maschinenfabrik J. Dieffenbacher Gmbh & Co. Continuously working press
DE19810553A1 (en) * 1998-03-11 1999-09-16 Dieffenbacher Gmbh Maschf Safety appliance for continuously operating press used for producing chipboard, fiberboard and wooden or plastic panels

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2157746C3 (en) * 1971-11-22 1978-10-05 Eduard Kuesters, Maschinenfabrik, 4150 Krefeld Press for exerting a surface pressure
DE2211724B2 (en) * 1972-03-10 1976-12-02 Bison-Werke Bahre und Greten GmbH & CoKG, 3257 Springe ROLL PROBE FOR MEASURING AND SENDING CONTROL IMPULSES TO A SUBSEQUENT CONTROL DEVICE OF A CONTINUOUSLY OPERATING MACHINE FOR THE MANUFACTURING OF CHIPBOARD AND / OR FIBER BOARD CONSTANT THICKNESS
DE3725383C1 (en) * 1987-07-31 1988-12-01 Siempelkamp Gmbh & Co Plant for the hot pressing of pressed material mats in the production of chipboard, fibreboard and the like.
DE3918755C2 (en) * 1989-06-08 1998-08-27 Dieffenbacher Gmbh Maschf Continuously working press
DE19829741C1 (en) * 1998-07-03 1999-08-26 Siempelkamp Gmbh & Co Continuos pressing process for chip or fiber board

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3907473A (en) * 1972-04-07 1975-09-23 Baehre & Greten Continuous presses
US4029456A (en) * 1974-10-31 1977-06-14 Eduard Kusters Maschinenfabrik Rapid load-relieve device for continuous press
US5042372A (en) * 1989-06-08 1991-08-27 Maschinenfabrik J. Dieffenbacher Gmbh & Co. Continuously working press
DE19810553A1 (en) * 1998-03-11 1999-09-16 Dieffenbacher Gmbh Maschf Safety appliance for continuously operating press used for producing chipboard, fiberboard and wooden or plastic panels

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005049880B4 (en) * 2005-10-17 2017-06-08 Dieffenbacher GmbH Maschinen- und Anlagenbau Method for protecting the machine elements of a continuously operating press and continuous press for carrying out the method

Also Published As

Publication number Publication date
AU6394001A (en) 2002-01-08
DE10031551A1 (en) 2002-01-17
DE10031551C2 (en) 2003-03-27

Similar Documents

Publication Publication Date Title
DE102006059564B4 (en) Method and device for pressing pressed material mats
EP1371466B1 (en) Press for continuous pressing
DE3903022C1 (en)
EP1938934B1 (en) Method and moulding station for forming a mat of dispensed material during the manufacture of material plates
DE3044671C2 (en)
DE102007019390B4 (en) Method for operating a safety device for a continuously operating press in the course of the production of material plates and a safety device for carrying out the method
EP1829657A2 (en) Method for continuously manufacturing composite panels, and a prepress for carrying out the method
EP1790465B1 (en) Safety system in a continuously operating press for the production of fiberboards from wood
WO2002000422A1 (en) Double-band press
DE10146907A1 (en) Vlieszuführvorrichtung
EP1479510B1 (en) Method and installation for guiding a steel band in a continuously operating press
DE3825819C2 (en)
DE3009016C2 (en)
DE19829741C1 (en) Continuos pressing process for chip or fiber board
DE102005049880B4 (en) Method for protecting the machine elements of a continuously operating press and continuous press for carrying out the method
DE102006012430B4 (en) Process for the continuous production of multilayer boards and a plant for carrying out the process
AT502387B1 (en) Bale pressing method for cellulose flocks, comprises weighing cellulose supplied to press
EP1428652B1 (en) Continuously operating press with a safety device
DE4031171C2 (en) Press system for pressing pressed material mats in the course of the production of chipboard
DE19829742C1 (en) Continuos pressing process for chip or fiber board
DE4234213C2 (en) Plant for the production of chipboard
DE19821904C1 (en) Initial press, used in board production
DE2652220A1 (en) PROCESS FOR REDUCING THE PRESS PUSH IN THE PRODUCTION OF WOOD CHIPBOARD OR DGL.
DE19810553A1 (en) Safety appliance for continuously operating press used for producing chipboard, fiberboard and wooden or plastic panels
EP1442857B1 (en) Device for distributing granular material onto a continously travelling support

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP