DE2313556B2

DE2313556B2 - CONTINUOUSLY WORKING PRESS FOR THE MANUFACTURING OF PANELS, SUCH AS CHIPBOARD, FIBER PANELS OR DGL.

Info

Publication number: DE2313556B2
Application number: DE19732313556
Authority: DE
Inventors: Albert De Kachtem Izegem Mets (Belgien)
Original assignee: Bison Werke Baehre and Greten GmbH and Co KG
Current assignee: Bison Werke Baehre and Greten GmbH and Co KG
Priority date: 1973-03-19
Filing date: 1973-03-19
Publication date: 1976-08-12
Also published as: DE2313556A1

Description

«nd außer einem Minimum/Maximum-Koniaki-Mano- »eter 16, ein steuerbares Druekablaßventil 17 und ein Oberdruck-Sicherheitsveniil 18 angeschlossen. ZwiiChen der Leitung 13 und dem Druck-Ablaßventil 17 ist «ne weitere, ebenfalls einstellbar ausgebildete Drossel 5 19 vorgesehen.«Nd except for a minimum / maximum Koniaki mano »Eter 16, a controllable pressure relief valve 17 and an overpressure safety valve 18 connected. In between the line 13 and the pressure relief valve 17 is a further throttle 5, which is also adjustable 19 provided.

Wie die Steuerung erfolgt, wird an Hand der F i g. j eriäuten. Zwischen den beiden Phasen R und S eines Wechselstromnetzes ist das Minimum/Maximum-Kun-Uikt-Manometer 16 einerseits über ein Zeitrelais 20 und andererseits über ein Relais 21 angeschlossen. Das Zeitrelais 20 steuert einen Schalier 22 und das Relais 21 einen Schalter 23. Der Schalter 22 liegt mit dem Zufwhrventil 14 und de.· Schalter 23 mit dem Druckablaßventil 17 zwischen den beiden Phasen R und S. Die F i g. 3 zeigt den stromlosen Zustand.How the control takes place is shown on the basis of FIG. j ring. Between the two phases R and S of an alternating current network, the minimum / maximum Kun-Uikt manometer 16 is connected on the one hand via a time relay 20 and on the other hand via a relay 21. The timing relay 20 controls a switch 22 and the relay 21 controls a switch 23. The switch 22 and the supply valve 14 and de. Switch 23 with the pressure relief valve 17 are between the two phases R and S. The FIG. 3 shows the currentless state.

Wird der Strom eingeschaltet, dann wird das Zeitrelais erregt, das nach einer wählbaren Zeit, beispielsweise nach 20 Sekunden, den Schalter 22 schliebt. Dadurch wird das Zufuhrventil 14 geöffnet und die im Speicher 10 vorhandene Druckflüssigkeit wird über ein Rückschlagventil 24 dem Zylinder 9 zugeführt, wobei die Drossel 15 beim plötzlichen Öffnen des Zufuhrventils «4 für einen stetigen Anstieg des Druckes sorgt. Verläßt der Kontaktzeiger 25 des Manometers 16 den Mitiimumkontakt 26, dann wird das Zeitrelais 20 stromlos, wodurch der Schalter 22 wieder geöffnet wird und das Zufuhrventil 14 die Leitung 13 schließt. Während davorstehend beschriebenen Vorgänge läuft die Presse un, es laufen also die beiden übereinander angeordneten Plattenketten, von denen nur die obere Plattenkette 27 dargestellt ist, und die beiden let/ieren umlassenden Stahlbänder, von denen nur das obere Stahlband 28 dargestellt ist, um, ohne jedoch eine Preßwirkung auszuüben. Wird nun ein Spänevlies in die Presse eingeführt, dann versucht das Vlies über das Stahlband 28 und die Plattenkette 27 die Druckmittel 3 und 4 im Sinne einer Druckerhöhung im Zylinder 9 zu beeinflussen, wodurch der Druck in der Leitung 13 ansteigt, der Kontaktzeiger 25 somit in Richtung auf den Maximum-Kontakt 29 verschwenkt wird. Hrreicht der Kontaktzeiger 25 den Maximum-Kontakt 29. dann schließt das Relais 21 den Schalter 23, wodurch das Druck-Ablaßventil 17 öffnet und automatisch eine Drucksenkung in der Leitung 13 hervorgerufen wird.When the power is turned on, the timing relay is activated excited after a selectable time, for example after 20 seconds, the switch 22 closes. As a result, the supply valve 14 is opened and the in the memory 10 existing pressure fluid is fed to the cylinder 9 via a check valve 24, the Throttle 15 ensures a steady increase in pressure when the supply valve «4 is suddenly opened. Leaves the contact pointer 25 of the pressure gauge 16 is the center contact 26, then the timing relay 20 is de-energized, whereby the switch 22 is opened again and that Supply valve 14 closes line 13. During the processes described above, the press is running Well, the two arranged one above the other are running Plate chains, of which only the upper plate chain 27 is shown, and the two let / ieren encircling ones Steel belts, of which only the upper steel belt 28 is shown, in order, however, to exert a pressing effect. If a chip fleece is now introduced into the press, then the fleece tries the pressure medium 3 and 4 in the sense of the steel belt 28 and the plate chain 27 to influence a pressure increase in the cylinder 9, whereby the pressure in the line 13 increases, the Contact pointer 25 is thus pivoted in the direction of maximum contact 29. The contact pointer hears 25 the maximum contact 29. Then the relay 21 closes the switch 23, whereby the pressure relief valve 17 opens and a pressure drop in line 13 is automatically brought about.

Sinkt nun der Druck in der Leitung 13 nur kurzzeitig, beispielsweise so weit, daß der Kontaktzeiger 25 den Minimumkontakl 2b berührt, dann bleibt dieser abgesenkte Druck zunächst erhalten, ohne daß der Leitung 13 über das Zufuhrventil 14 Druckflüssigkeit zugeführt wird, denn der mit dem Zeitrelais verbundene Schalter 22 spricht nur dann an, wenn der Minimaldruck eine gewisse Zeitlang unterschritten wird. Herrscht also beispielsweise 20 Sekunden lang ein Druck, der niedriger ist als der eingestellte Minimalwert, dann wird der Schalter 22 wieder geschlossen, um das Zufuhrventil 14 wieder mit dem Speicher und der Leitung 13 zu verbinden. If the pressure in line 13 only drops for a short time, for example so far that the contact pointer 25 touches the minimum contact 2b, then this remains lowered Pressure is initially obtained without the line 13 being supplied with pressure fluid via the supply valve 14 is, because the switch 22 connected to the timing relay only responds when the minimum pressure is a is undercut for a certain period of time. For example, if the pressure is lower for 20 seconds is than the set minimum value, then the switch 22 is closed again to the supply valve 14 to connect again to the memory and the line 13.

Schwankt der Druck in der Leitung 13 so. daß der Kontaktzeiger 14 zwischen dem Minimumkuntakt 26 und dem Maximumkontakt 29 hin- und herbewegt wird, dann ändert sich der in der Leitung 13 vorhandene Druck der Flüssigkeit nicht. Diese Lösung hat nicht nur den Vorteil, daß sich das bzw. die Druckmittel 3 und 4 den verschieden starken Vliesen anpaßt bzw. anpassen, erreicht wird auch, und dies ist sehr wesentlich, daß jede in den Einlaufbereich der Presse hinein bewegte Platte des oberen Plattenbandes sehr schnell in die unmittelbare Nähe der Oberseite des Vlieses gebracht wird und dann verhältnismäßig langsam gegen das Vlies gedrückt wird. Dadurch wird jedes Aufschlagen jeder Platte auf das Vlies mit absoluter Sicherheit verhindert. If the pressure in line 13 fluctuates. that the contact pointer 14 between the minimum contact 26 and the maximum contact 29 is moved back and forth, then the one present in the line 13 changes Pressure of the liquid does not. This solution not only has the advantage that the pressure means 3 and 4 adapting or adapting to the different thicknesses of nonwovens is also achieved, and this is very essential that each plate of the upper apron conveyor moved into the inlet area of the press very quickly into the immediate one Is brought near the top of the fleece and then relatively slowly against the Fleece is pressed. This prevents every slab from hitting the fleece with absolute certainty.

Selbstverständlich muß das Kontakt-Manometer 1β auf vorausbestimmte Werte eingestellt werden, der Minimumkontakt 26 beispielsweise auf einen Öldruck von 10 kp/cm- und der Maximumkontakt beispielsweise auf JO kp/cm-.Of course, the contact pressure gauge must be 1β can be set to predetermined values, the minimum contact 26, for example, to an oil pressure of 10 kp / cm and the maximum contact, for example JO kp / cm-.

Wenn die Dicke des Vlieses im wesentlichen konstant bleibt, wird jedes schräg nach unten einlaufende Gelenk 30. das benachbarte Platten des F.ndlos-Plattenbandes verbindet, durch die Druckrolle 3 bzw. die Druckrollen 3 und 4 heruntergedrückt, bis sieh die vor dem Gelenk liegende Platte im wesentlichen Mach auf das Vlies gelegt hat. Hierbei ist der Druck in Je^- Leitung 13 gesenkt worden. Nähen sich das nächstlolgen de Gelenk dieser Stelle, dann wird die Druckrolle 3 bzw. werden die Druckrollen 3 und 4 im Sinne der Frhöhung des Druckes in der Leitung 13 beeinflußt, bis sich beim Weiterbewegen des Lndlos-PI.itienbani.les der Druck wieder absenkt. Schaltvorgange werden dann nicht ausgeführt.If the thickness of the fleece remains essentially constant, each hinge 30 running diagonally downwards, which connects adjacent plates of the F.ndlos-apron conveyor, is pressed down by the pressure roller 3 or the pressure rollers 3 and 4 until you see the one in front of the joint Plate essentially put Mach on the fleece. Here, the pressure in Je is ^- line 13 has been lowered. If the next de joint is sewn to this point, then the pressure roller 3 or the pressure rollers 3 and 4 are influenced in the sense of increasing the pressure in the line 13, until the pressure drops again when the continuous movement of the lndlos-PI.itienbani.les is continued . Switching processes are then not carried out.

Wird die Dicke des Vlieses nun aus irgendeinem Grund geringer, bleibt also der Druck in der l.eiuin;j 13 eine gewisse Zeit unter dem Mininuimdruck. dann steuert das Zeitrelais 20 den Schalter 22 im Sinne Schließen und das Druckzufnhrveniil oil net sich, wodurch sich dann in der Leitung 13 ein über dem Minimumdruck liegender Druck einstellt. 1-nisprechendes gilt für den Fall, daß die Dicke des Vlieses großer wird, in diesem Fall steigt der Druck in der Leitung 13. der Kontaktzeiger 25 erreicht den Maximalkontakt 29. wodurch dann über das Relais 21 und den Schalter 23 das Druck-Ablaßventil 17 geöffnet wird.If, for whatever reason, the thickness of the fleece becomes smaller, the pressure remains in the l.eiuin; j 13 a certain time under the miniature continuity. then the timing relay 20 controls the switch 22 in the sense Close and the pressure supply valve oil net itself, whereby then a pressure above the minimum pressure is established in line 13. 1-speaking applies in the event that the thickness of the fleece is greater, in this case the pressure in line 13 rises Contact pointer 25 reaches the maximum contact 29, which then via relay 21 and switch 23 Pressure relief valve 17 is opened.

Durch die Anordnung der beiden Drosseln 15 und 19 wird verhindert, daß der Druck in der Leitung 13 /11 schnell ansteigt bzw. zu plötzlich absinkt.The arrangement of the two throttles 15 and 19 prevents the pressure in line 13/11 increases rapidly or decreases too suddenly.

Hierzu 3 Blatt ZeichnungenFor this purpose 3 sheets of drawings

Claims

Claim:

Continuously working press for the production of panels such as chipboard. Fiberboard or the like, with two endless plate belts arranged one above the other, which are guided by deflecting wheels of polygonal contour that are rotatable about horizontally and parallel axes, consist of hinged, heated plates and can be pressed against each other in the pressing area by preferably drivable rollers, each Endless apron belt is encompassed by an endless steel belt, and in the area of the entry point of the fleece to be pressed between the deflection wheel and the first pressure roller at least one pressure roller which enlarges the space enclosed by the endless apron belt is provided, the pressure force and direction of which is adjustable. according to patent application 22 16 782, characterized in that a cylinder (9) operatively connected to the pressure roller or pressure rollers (3. 4) is connected to a memory (10) via a line (13) . an electromagnetically controllable feed valve (14) with a throttle (15) is arranged in this line (13). and a controllable pressure relief valve (17) with an upstream throttle (19) and an overpressure safety valve are connected to this line (13) in addition to a minimum / maximum contact manometer (16) and these are controllable in such a way that after a power source is switched on (R. S) via a time relay (20) the feed valve (14) opens in order to build up a minimum pressure in the cylinder (9), when it is reached the feed valve (14) closes and when the pressure in the cylinder (9) increases, it closes a maximum value, the pressure relief valve (17) opens and closes again when the pressure in the line (13) is less than the set maximum value of the pressure. wherein the time relay (20) opens the pressure / supply valve (14) when the pressure in the cylinder (9) is below the set minimum value of the pressure for longer than a selectable amount of time.

4545

The invention relates to a continuously operating press for the production of panels, such as chipboard, razor panels or the like, with two endless panel belts arranged one above the other, which are guided by reversing wheels with a polygonal contour that are rotatable about horizontally and parallel axes articulated, heated plates exist and can be pressed against each other in the pressing area by preferably drivable rollers, each Ilndlos plate belt is encompassed by an endless steel belt and in the area of the entry point of the nonwoven to be pressed between the deflection wheel and the first pressure roller at least one of the endless enclosed space to provide magnifying pressure roller ^ o plate belt, whose pressure force and direction can be adjusted, according to patent application 22 16 782. As a result, pivoting movements allow the endless Plaltcnbänder and therefore undesirable Bewegun ^hs gene comprising the endless Plattcnbänder, further endless steel bands pra avoid table.

SnhiniTP sirh does not change the thickness of the fleece, it is sufficient to keep the pressure in the cylinder constant. If the fleece thickness changes, however, then it must the pressure in the cylinder can also be changed. The invention is therefore based on the object of the press to be further developed after the main registration. that the pressure of the pressure roller or pressure rollers is automatic can be regulated. To solve this problem, the invention proposes a with the pressure roller or the pressure rollers in operative connection via a line to a cylinder To connect memory, to arrange an electromagnetically controllable supply valve with throttle in this line and a controllable pressure gauge on this line in addition to a minimum / maximum contact pressure gauge Pressure relief valve with upstream throttle and an overpressure safety valve to be connected and this to control so that after switching on a power source via a timing relay opens the supply valve to to build up a minimum nip in the cylinder When the supply valve closes and when the pressure in the cylinder increases, it exceeds a maximum value In addition, the pressure relief valve opens and closes again when the pressure in the line is less than is the set maximum value of the pressure. whereby the time relay opens the pressure / supply valve when the Pressure in the cylinder longer than a selectable amount of time is below the set minimum value of the pressure. This solves the task at hand.

The invention is based on an exemplary embodiment explained schematically below. It shows

F i g. 1 part of the upper apron conveyor in the area the Lünlauf-Umlenkrades with two pressure means according to the main patent.

F i g. 2 a hydraulic scheme,

F i g. 3 an electric switchgear a.

In the drawing is part of the upper endless apron conveyor a continuously operating press is shown, namely the one in the inlet area of the press Part. This endless apron conveyor 1 is in a known manner on deflection wheels 2 polygonal contour guided and driven by pressure rollers, not shown. Between that in the inlet area of the scattered fleece in the press arranged deflection wheel 2 and the first, not shown esicllien Pressure roller of each endless apron conveyor is now provided at least one pressure roller that corresponds to the respective Attempts to enlarge the apron conveyor 1 enclosed space. In the illustrated case there are two Pressure rollers 3 and 4 are provided, which are mounted on a carrier 5. The carrier 5 is opposite about an axis 6 a guide means 7 pivotable, which itself by an adjustable pressure force in the direction of the Arrow 8 can be influenced. This force can be generated, for example, in that the in a cylinder 9 guided guide means 7 is under the action of a hydraulic medium.

If the pressure prevailing in the cylinder 9 is to be able to be changed in order to adjust the position of one or two pressure media to be able to change according to the change in the thickness of the chipboard to be produced, then will the pressure cylinder ') connected to a memory 10, which is connected, for example, via a line 11 to a hydraulic pump 12, in order to store 10 to have a sufficiently high pressure available at all times. In line 13th the the pressure cylinder 9 connects to the memory 10 is an electromagnetically controllable supply valve 14 and a adjustable throttle 15 arranged. To line 13