DD233167A1

DD233167A1 - DEVICE FOR DRYING CERAMIC MOLDINGS

Info

Publication number: DD233167A1
Application number: DD27178884A
Authority: DD
Inventors: Wolfgang Ruske; Alfred Zwicker; Juergen Oberender
Original assignee: Thuringia Sonneberg Veb
Priority date: 1984-12-27
Filing date: 1984-12-27
Publication date: 1986-02-19

Abstract

Die Erfindung betrifft eine Vorrichtung zum Trocknen von keramischen Formlingen, insbesondere Flach- und Hohlgeschirr, in duesenbestueckten Trocknern mit schrittweise bewegtem Foerderer mit dem Ziel, den bisherigen Energieaufwand beim Trocknen zu senken. Erfindungsgemaess wird die Aufgabe dadurch geloest, dass die Trocknungsluft in einem Druck/Unterdrucksystem zirkuliert. Bei den Transportphasen der Formlinge wird die aufgeheizte Trocknungsluft durch Steuern von Luftschiebern in einen, im Luftaufbereitungssystem befindlichen Bypass gezwungen, so dass keine uneffektiv am Trocknungsvorgang beteiligte Luftmenge mit aufgeheizt wird. Das Druck/Unterdrucksystem trocknerseitig ist geschlossen. Befinden sich die Formlinge in Arbeitsstellung unter den Duesen, werden die Luftschieber so gesteuert, dass der Bypass gesperrt und das Druck/Unterdrucksystem trocknerseitig geoeffnet ist. Fig. 1The invention relates to a device for drying ceramic moldings, in particular flat and hollowware, in duesenbestueckten dryers with gradually moving conveyor with the aim to reduce the previous energy consumption during drying. According to the invention, the object is achieved by circulating the drying air in a pressure / vacuum system. During the transport phases of the blanks, the heated drying air is forced by controlling air slides into a bypass located in the air treatment system, so that no amount of air involved in the drying process is heated up inefficiently. The pressure / vacuum system on the dryer side is closed. When the molds are in the working position below the nozzles, the air slides are controlled so that the bypass is blocked and the pressure / vacuum system is opened on the dryer side. Fig. 1

Description

embodiment

Die Erfindung soll nachstehend an einem Ausführungsbeispiel näher erläutert werden. In der zugehörigen Zeichnung zeigen:The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawing show:

Fig. 1: eine schematische Anordnung der erfindungsgemäßen VorrichtungFig. 1: a schematic arrangement of the device according to the invention

Fig.2: einen Schnitt nach Fig. 1 gemäß Linie l-l2 shows a section according to FIG. 1 along the line I-I

Über den Formungen 9 sind gleichviel Düsen 8 befestigt, die mit der Überdruckkammer 7, die sich im oberen Teil des Düsenkastens 4 befindet, verbunden sind. Im unteren Teil des Düsenkastens 4 befindet sich die Unterdruckkammer 3, in der die Saugöffnungen 2 eingelassen sind. Die Überdruckkammer 7 steht mit dem Überdruckverteilerkasten 6 und die Unterdruckkammer 3 mit dem Unterdruckverteilerkasten 10, in dem sich die Frischluftklappe 11 befindet, in Verbindung, und zwischen dem Überdruckverteilerkasten 6 und dem Unterdruckverteilerkasten 10 sind nacheinander der Luftschieber 12, das Verteilerstück 13, der Ventilator 1, der Wärmeübertrager 5, das Verteilerstück 14 und der Luftschieber 15 angeordnet. Die abzweigenden Enden der Verteilerstücke 13,14 sind durch die Verbindungsleitung 16, in der sich der Luftschieber 17 befindet, miteinander verbunden.About the formations 9 the same number of nozzles 8 are fixed, which are connected to the pressure chamber 7, which is located in the upper part of the nozzle box 4. In the lower part of the nozzle box 4 is the vacuum chamber 3, in which the suction openings 2 are embedded. The pressure chamber 7 communicates with the pressure distribution box 6 and the vacuum chamber 3 with the vacuum distribution box 10, in which the fresh air damper 11 is located, and between the pressure distribution box 6 and the vacuum distribution box 10 are successively the air slide 12, the manifold 13, the fan. 1 , the heat exchanger 5, the manifold 14 and the air slide 15 are arranged. The branching ends of the manifolds 13,14 are interconnected by the connecting line 16, in which the air slide 17 is located.

Der Überdruckverteilerkasten 6 und der Unterdruckverteilerkasten 10 sind mit mehreren Düsenkästen 4 verbunden. Die Luftschieber 12,15,17 stehen mit Stelleinheiten in Verbindung, die im Ausführungsbeispiel als pneumatische Arbeitszylinder 18, 19,20 ausgebildet sind. Während der Arbeitsstellung der Formlinge 9 unter den Düsen 8 saugt der Ventilator 1 Umluft aus dem Trockenraum durch die Saugöffnungen 2 an. Die Umluft strömt in die Unterdruckkammern 3 der Düsenkasten 4 weiter in den Unterdruckverteilerkasten 10, der als Mischkammer wirkt und wird dort mit Frischluft vermischt. Die Mischluft strömt aus dem Unterdruckverteilerkasten 10 durch den geöffneten Luftschieber 12 und durch das Verteilerstück 13 zu den Ventilator 1, der die Mischluft durch den Wärmeübertrager 5, das Verteilerstück 14, den geöffneten Luftschieber 15 in den Überdruckverteilerkasten 6 drückt. Von dort aus strömt die aufgeheizte Mischluft in die Unterdruckkammern 7 der Düsenkästen 4 und weiter durch die Düsen 8 auf die Formlinge 9.The pressure distribution box 6 and the vacuum distribution box 10 are connected to a plurality of nozzle boxes 4. The air slides 12,15,17 are associated with actuators, which are formed in the embodiment as a pneumatic cylinder 18, 19,20. During the working position of the blanks 9 under the nozzles 8, the fan 1 sucks circulating air from the drying chamber through the suction openings 2. The circulating air flows into the vacuum chambers 3 of the nozzle box 4 on in the vacuum distribution box 10, which acts as a mixing chamber and is mixed there with fresh air. The mixed air flows from the vacuum distribution box 10 through the open air slide 12 and through the manifold 13 to the fan 1, which presses the mixed air through the heat exchanger 5, the manifold 14, the opened air slide 15 in the pressure-distribution box 6. From there, the heated mixed air flows into the vacuum chambers 7 of the nozzle boxes 4 and further through the nozzles 8 on the moldings. 9

Während dieser Arbeitsphase bleibt der Luftschieber 17 der Verbindungsleitung 16 geschlossen.During this working phase, the air slide 17 of the connecting line 16 remains closed.

Werden die Formlinge 9 aus dem Bereich der Düsen 8 herausgeführt, so werden die Luftschieber 12,15 geschlossen und der Luftschieber 17 geöffnet, dadurch wird die aufgeheizte Mischluft in einen Bypaß gezwungen und kann das Luftaufbereitungssystem nicht verlassen. In dieser Arbeitsphase wird keine Umluft im Trockenraum umgewälzt, zugeführt oder abgesaugt, dadurch wird die Abkühlung der nicht am Trocknungsvorgang beteiligten Luftwege vermieden. Gelangen die Formlinge 9 wieder in den Bereich der Düsen 8, werden die Luftschieber 12,15 geöffnet und gleichzeitig die Luftschieber 17 geschlossen.If the blanks 9 led out of the region of the nozzle 8, the air slide 12,15 are closed and the air slide 17 is opened, thereby the heated mixed air is forced into a bypass and can not leave the air treatment system. In this working phase, no circulating air is circulated, supplied or sucked off in the drying room, thereby avoiding the cooling of the airways not involved in the drying process. If the blanks 9 again reach the area of the nozzles 8, the air slides 12, 15 are opened and at the same time the air slides 17 are closed.

Die Trocknungsluft zirkulliert im oben beschriebenen Kreislauf.The drying air circulates in the cycle described above.

Claims

Invention claim:

1. Apparatus for drying ceramic moldings, in particular flat and hollowware, in nozzle-equipped dryers with gradually moving conveyor characterized in that over, according to the number of moldings 9, nozzles 8 are fixed, with a Überdruckkammer7 located in the upper part a nozzle box 4 is connected, that further in the lower part of the nozzle box 4, a vacuum chamber 3 is located in the suction ports 2 are admitted, that the pressure chamber 7 with a pressure distribution box 6 and the vacuum chamber 3 with a vacuum distribution box 10, in which a Fresh air damper 11 is located, in connection that further between the Überdmckverteilerkasten 6 and the vacuum distribution box 10 successively an air slide 12, a manifold 13, a fan 1, a heat exchanger 5, a manifold 14 and an air slide 15 are arranged, and that the branching Ends of the verte ilerstücke 13,14 through a connecting line 16, in which an air slide 17 is connected to each other.

2. Device according to item 1, characterized in that the air slide 12,15,17 are in communication with actuators.

3. Device according to item 1 and 2, characterized in that the Überdmckverteilerkasten 6 and the vacuum distribution box 10 is connected to a plurality of nozzle box 4.

For this 2 pages drawings

Field of application of the invention

The invention relates to a device for drying ceramic molds, in particular flat and hollowware, in nozzle-equipped dryers with gradually moving conveyor.

Characteristic of the known technical solutions

There are already known in the drying of ceramic objects, such as plates, cups or trays according to DE OS 2126449 from which desiccant flows during the working position of the molding under the nozzles and in its transport phases to the respective subsequent nozzles.

The heated dry air mixes during the transport phases with the colder air in the drying room without having been effectively used for the drying process.

This has the disadvantage that this ineffective involved in the drying process amount of air is constantly treated with heat technology and thus uneconomically high energy costs for the drying plant arise, also occurs in the. Transport movement short-term unbalanced exposure, which leads to drying errors in completely shaped articles.

You could turn off the fan motors during the transport phases of the material to be dried and turn it back on when plasiert under the nozzles. This would lead to load peaks in the electric energy system, as well as high pressure drop in the nozzle boxes and noise nuisance.

High pressure drops in the nozzle boxes and noise nuisances would also occur with conventional nozzle dryers when installing gate valves in the vacuum or in the pressure system of the air treatment plant.

Object of the invention

The object of the invention is to propose a device for drying ceramic moldings, with which the previous energy consumption and the breakage rate is lowered, which has a simple structure and can be produced inexpensively.

Explanation of the essence of the invention

The invention has for its object to provide a device for drying ceramic moldings, in particular flat and hollowware, in nozzle-equipped dryers with gradually moving conveyor, mixing the emerging during the transport phases of the moldings from the heated drying air drying with the in the drying room located colder air prevented.

According to the invention the object is achieved in that are fixed according to the number of moldings nozzles, which are connected to a pressure chamber, which is located in the upper part of a nozzle box, that further in the lower part of the nozzle box is a vacuum chamber, in the suction opening let in that the pressure chamber with a vacuum manifold, in which a fresh air damper is in communication, that further between the pressure distribution box and the vacuum manifold box successively arranged an air valve, a manifold, a fan, a heat exchanger, another manifold and another air slide are, and that the branching ends of the manifolds connected by a connecting line in which a third air slide is connected

The three Lurct.chieher are each associated with a linear unit.

Several nozzle boxes are connected to the overflow distribution box and the vacuum distribution box. By the arrangement of components described, the heated drying air, which flows during the further transport of the moldings from the nozzles, are guided in a bypass located in the air treatment system, so that no mixing with the air cooled in the drying room air is possible.

The pressure changes in the nozzle boxes are kept small and avoid noise nuisance.