EP0486711B1 - Apparatus for blowing off a liquid from an article - Google Patents

Apparatus for blowing off a liquid from an article Download PDF

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Publication number
EP0486711B1
EP0486711B1 EP90122063A EP90122063A EP0486711B1 EP 0486711 B1 EP0486711 B1 EP 0486711B1 EP 90122063 A EP90122063 A EP 90122063A EP 90122063 A EP90122063 A EP 90122063A EP 0486711 B1 EP0486711 B1 EP 0486711B1
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EP
European Patent Office
Prior art keywords
liquid
compressed
air
articles
pressurized air
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EP90122063A
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German (de)
French (fr)
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EP0486711A1 (en
Inventor
Ernst Eichholzer
Alfred Schnyder
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Eichholzer Ernst
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Individual
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Priority to DE59006720T priority Critical patent/DE59006720D1/en
Priority to EP90122063A priority patent/EP0486711B1/en
Priority to AT90122063T priority patent/ATE109553T1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/14—Drying solid materials or objects by processes not involving the application of heat by applying pressure, e.g. wringing; by brushing; by wiping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes

Definitions

  • the present invention relates to a device for blowing off a liquid from an object wetted by the same, wherein a plurality of high-frequency pulsating, abrupt shocks of at least approximately parallel compressed air jets are directed against the object in order to drive the liquid away and between the compressed air jets and the drying object an at least approximately perpendicular to the flow direction of the compressed air jets relative movement is generated.
  • EP-A-0 205 819 a device for blowing off a liquid from a liquid wetted with the same is known, in which a solvent polluting the environment is blown intermittently against spectacle lenses.
  • This device is intended for treating a given object, namely spectacle lenses and cannot be used for a wide variety of objects.
  • Next is a part of the blow nozzles Device according to EP-A-0 205 819 stationary. Because the jet directions are at an angle to one another and, moreover, the air discharge nozzles can be moved in a very limited manner with respect to the objects to be dried, drying with such a device requires a very long period of time.
  • the invention seeks to remedy this.
  • the invention as characterized in claim 1, achieves the object of showing a device for blowing off a liquid from an object wetted by the same, in which two air jet dispensing devices arranged at a mutual distance, by means of which compressed air jets pulsate intermittently against the object to be dried are blown, are connected to one another in such a way that they are moved parallel and in opposite directions to one another during operation, the compressed air jets emitted by the two air jet delivery devices being directed toward one another.
  • Figure 1 shows a schematically illustrated container 1, which is designed as a trough and e.g. is arranged in a street consisting of various treatment containers of a system for the surface treatment of objects.
  • a system for the surface treatment of objects e.g. copper plating, chrome plating, silver plating, generally e.g.
  • Electroplating takes place, among other things also electrolyte baths, but also baths for currentless processes such as Degreasing, pickling, phosphating and electroless metal deposition baths, but also baths for the anodic oxidation of aluminum, baths for dip painting can be present.
  • Such systems are generally known in surface technology.
  • Air jet delivery devices are arranged along the two longitudinal walls of the container 1 and are configured as follows. Each air jet delivery device has a side member 3, which in this example guided in the height direction of the container 1 is movable.
  • the drive is carried out by a motor 4 with adjustable speed, which is connected to the longitudinal beams 3 by means of chain sprockets 5 and chains 6, for example.
  • the drive transmission is designed such that the side members can be moved in the same direction or in opposite directions to one another, ie if, for example, the side member 3 on the left moves from top to bottom, the side member 3 on the right simultaneously moves from bottom to top.
  • a number of tubes 7, closed on both sides, are connected to each longitudinal beam.
  • the tubes 7 are axially aligned with one another and run horizontally in this example.
  • the number of tubes 7 shown is purely for drawing reasons, for example. For example, 20 such tubes 7 may be present.
  • Each tube 7 has air outlet openings 8 which are arranged along a surface line of the respective tubes 7 in such a way that air jets emerging therefrom are directed at least approximately in a horizontal direction against the objects 2 to be treated.
  • the axial length of the tubes is approximately 150 mm, each tube containing 15 air outlet openings 8 at a mutual distance of 10 mm.
  • the compressed air is supplied via a compressor 9, which sucks in air from the environment.
  • the compressed air is fed from the compressor 9 to the tubes 7 via hose lines 10.
  • hose lines 10 For drawing reasons, only one hose line 10 is shown in each case.
  • the compressed air supply to the individual tubes 7 is controlled by solenoid valves 11, such a solenoid valve 11 being assigned to each individual tube. These solenoid valves 11 are individually connected via control lines 12 to a control device 13, the function of which will be explained below.
  • a schematic Drain pipe socket 14 is drawn, via which the liquid chipped off from the objects 2 is removed, possibly disposed of, or also returned to a treatment stage of the system after possible treatment.
  • Each tube 7 is supplied with compressed air via a magnetic valve 11 assigned to it.
  • the magnetic valves 11 are controlled by a microprocessor in the control device 13. Both the opening time of the solenoid valves and the frequency of opening and closing them can be set by the control device 13 depending on the application.
  • the pressure of the compressed air supplied is approximately 4 to 6 bar.
  • the solenoid valves 11 can be controlled by the control device 13 in such a way that not all tubes 7 are acted upon simultaneously, but successively, in groups, etc. As an example, it should also be stated that a compressed air blast occurs from the respective air outlet openings 8 every 0.4 seconds.
  • the frequency and duration of the compressed air pulses are determined in the control device 13 in accordance with empirical values, test runs that have been carried out temporarily, such that as soon as the remaining quantity of the liquid returns to the original area, the next compressed air pulse hits it in order to cause it to drift away again.
  • the longitudinal beam 3 with the tubes 7 becomes extremely slow, e.g. Moved 25 mm / second from top to bottom, so that two successive bursts of compressed air hit practically the same area, so that actually the successive regions of the impact points of the compressed air bursts overlap each other by a multiple, with the displacement of two successive impact areas in the vertical direction just for example Is 10 mm. While the nozzle assembly on the left in FIG. 1 moves downward along the objects, the one on the right moves upward.
  • Figure 2 shows purely schematically another application in a system for surface treatment.
  • the container 1 is again shown in a purely schematic representation.
  • the objects 2 to be dried and the longitudinal members 3 are drawn with the tubes 7.
  • a further nozzle assembly 16 for flushing water is arranged above each nozzle assembly 3, 7 for the compressed air, and in this embodiment there are nozzles for the smallest amounts of water with optimal scattering.
  • This version is intended for use, for example, between an electrolyte bath and an economy flushing device.
  • the objects 2 lifted out of the electrolyte bath and inserted into the container 1 are initially exposed to the compressed air blasts in accordance with the above-mentioned procedure in order to knock off the electrolyte and to knock it back accordingly.
  • the electrolyte portion remaining on the objects in the form of a film dries out completely.
  • these objects are exposed to the water jets during the first or during a second pass, the amounts of water being selected in such a way that the residual electrolyte does not dry out until it is inserted into the subsequent so-called economy rinse bath.
  • FIG. 3 shows, again purely schematically, a further embodiment, in particular for pure drying, thus blowing off rinse water, for example. It is known that one goal of all types of drying is to achieve so-called spot-free drying, ie that no drops or traces of drops remain on the dried objects. Since even the smallest droplets are continuously destroyed and blown off by the air blasts, the above-mentioned goal can be achieved visually with the method according to the invention.
  • the container 1 also has a heat protection jacket, one on the side walls and one on the bottom thermal insulation 17.
  • the space between the wall of the container 1 and the inner container is designed as a flow channel 19 which leads to the interior of the container 1.
  • the liquid on the surfaces of the objects 2 is knocked off again by the compressed air blasts, the drops fly or flow to the bottom of the container 1 in order to flow away through a drain connection (not shown).
  • a drain connection not shown.
  • One or more fans 21 are arranged in the bottom of the trough at a point between the same and the intermediate floor 20. These blowers 21 suck the moist air from the interior of the container 1 and convey it through drying devices 22. From these drying devices 22, the re-dried air flows, see arrow 23, into the space acting as a flow channel 19 between the inner container 18 and the outer wall of the container 1 to flow back through the passages 19 into the actual treatment room.
  • the moisture in the air which forms in the air in the container 1 is destroyed by the circuit described, which includes blowers 21 and drying devices 22, so that again and again dry air flows into the treatment room.

Abstract

For blowing off the liquid, a large number of impacts, pulsating at high frequency and taking place abruptly, of compressed-air jets are directed towards the article. At the same time, a relative movement between the compressed-air jets and the article is created, so that its entire surface is passed over by the compressed-air jets. The compressed-air jets, which strike in a pulsating manner, remove the liquid. As individual quantities or drops of the liquid to be blown off, which return to the original place by wetting forces or gravity after the impact of a respective compressed-air jet, are removed by the impact immediately following, made more fine and blown away. By means of these impacts of compressed-air jets pulsating at high frequency, the respective article is dried in a short time and with small energy expenditure. The process is also suitable for blowing treatment substances off articles, so that these can be recovered and recycled to a previous treatment stage of the articles. <IMAGE>

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zum Abblasen einer Flüssigkeit von einem mit derselben benetzten Gegenstand, wobei eine Vielzahl hochfrequenz pulsierende, schlagartig erfolgende Stösse von mindestens annähernd parallel zueinander verlaufenden Druckluftstrahlen gegen den Gegenstand gerichtet werden, um die Flüssigkeit wegzutreiben und zwischen den Druckluftstrahlen und dem zu trocknenden Gegenstand eine mindestens annähernd senkrecht zur Strömungsrichtung der Druckluftstrahlen gerichtete Relativbewegung erzeugt wird.The present invention relates to a device for blowing off a liquid from an object wetted by the same, wherein a plurality of high-frequency pulsating, abrupt shocks of at least approximately parallel compressed air jets are directed against the object in order to drive the liquid away and between the compressed air jets and the drying object an at least approximately perpendicular to the flow direction of the compressed air jets relative movement is generated.

In Anlagen zur Oberflächenbehandlung von Gegenständen gibt es Behandlungsstufen, bei denen an der Oberfläche der Gegenstände vorhandene Flüssigkeiten entfernt werden müssen, sei dies zur Werkstoffrückgewinnung, z.B. eines Elektrolyten oder dann zur Trocknung derselben.In systems for the surface treatment of objects there are treatment stages in which liquids present on the surface of the objects have to be removed, be it for material recovery, e.g. an electrolyte or then to dry it.

Bekannte Verfahren beruhen, z.B. wenn die Gegenstände mit Wasser benetzt sind, auf einem Verdunsten oder wenn die Gegenstände von chemischen Behandlungsmitteln benetzt sind, z.B. Elektrolyten, auf einem Trocknen mit Lösungsmitteln (FCKW, FKW, etc.). Ein Trocknen mit Verdunstung benötigt lange Zeitspannen und einen hohen Energieaufwand, und ein Trocknen mit Lösungsmitteln bedeutet eine Umweltbelastung oder dann einen weiteren Energieaufwand zur Entsorgung der Lösungsmittel.Known methods are based, e.g. if the objects are wetted with water, on evaporation or if the objects are wetted with chemical treatment agents, e.g. Electrolytes, on drying with solvents (CFCs, CFCs, etc.). Drying with evaporation takes a long time and requires a lot of energy, and drying with solvents means an environmental burden or then further energy is required to dispose of the solvents.

Aus der EP-A-0 205 819 ist eine Vorrichtung zum Abblasen einer Flüssigkeit von einem mit derselben benetzten Flüssigkeit bekannt, bei der ein die Umwelt belastendes Lösungsmittel stossweise gegen Brillengläser geblasen wird. Diese Vorrichtung ist zum Behandeln eines vorgegebenen Gegenstandes, nämlich Brillengläser bestimmt und lässt sich nicht für die unterschiedlichsten Gegenstände verwenden. Weiter ist ein Teil der Blasdüsen der Vorrichtung nach der EP-A-0 205 819 ortsfest. Weil die Strahlrichtungen in einem Winkel zueinander verlaufen und überdies die Luftabgabedüsen in bezug auf die zu trocknenden Gegenstände sehr beschränkt bewegbar sind, bedarf ein mit einer solchen Vorrichtung durchgeführtes Trocknen eine sehr lange Zeitspanne.From EP-A-0 205 819 a device for blowing off a liquid from a liquid wetted with the same is known, in which a solvent polluting the environment is blown intermittently against spectacle lenses. This device is intended for treating a given object, namely spectacle lenses and cannot be used for a wide variety of objects. Next is a part of the blow nozzles Device according to EP-A-0 205 819 stationary. Because the jet directions are at an angle to one another and, moreover, the air discharge nozzles can be moved in a very limited manner with respect to the objects to be dried, drying with such a device requires a very long period of time.

Hier will die Erfindung Abhilfe schaffen. Die Erfindung, wie sie in Anspruch 1 gekennzeichnet ist, löst die Aufgabe, eine Vorrichtung zum Abblasen einer Flüssigkeit von einem mit derselben benetzten Gegenstand zu zeigen, bei welcher zwei in einem gegenseitigen Abstand angeordnete Luftstrahlabgabeeinrichtungen, mittels welchen Druckluftstrahlen pulsierend stossweise gegen den zu trocknenden Gegenstand geblasen werden, derart miteinander antriebsverbunden sind, dass sie im Betrieb parallel und gegensinnig zueinander bewegt werden, wobei die von den zwei Luftstrahlabgabeeinrichtungen abgegebenen Druckluftstrahlen gegeneinander gerichtet sind.The invention seeks to remedy this. The invention, as characterized in claim 1, achieves the object of showing a device for blowing off a liquid from an object wetted by the same, in which two air jet dispensing devices arranged at a mutual distance, by means of which compressed air jets pulsate intermittently against the object to be dried are blown, are connected to one another in such a way that they are moved parallel and in opposite directions to one another during operation, the compressed air jets emitted by the two air jet delivery devices being directed toward one another.

Die durch die Erfindung erreichten Vorteile sind im wesentlichen darin zu sehen, dass Flüssigkeitstropfen, die aus aerodynamischen Gründen bei einem ersten Druckluftstoss lediglich ausgewichen sind und nach der Beendigung dieses Druckluftstosses wieder zur ursprünglichen Stelle zurückkehren, durch den unmittelbar folgenden Druckluftstoss getroffen und gesprengt werden. Damit lässt sich ein Trocknen von benetzten Gegenständen schneller und besser durchführen. Auch können Gegenstände der unterschiedlichsten Formen schnell und sicher getrocknet werden.The advantages achieved by the invention are essentially to be seen in the fact that liquid drops which, for aerodynamic reasons, have only evaded during a first compressed air blast and return to the original position after the end of this compressed air blast, are hit and blasted by the immediately following compressed air blast. This allows drying of wetted objects faster and better. Objects of various shapes can also be dried quickly and safely.

Nachfolgend wird der Erfindungsgegenstand anhand der Zeichnungen beispielsweise näher erläutert.The subject matter of the invention is explained in more detail below with reference to the drawings, for example.

Es zeigt:

  • Figur 1 schematisch eine Vorrichtung zum Trocknen von Gegenständen,
  • Figur 2 schematisch eine Vorrichtung zur Wertstoffrückgewinnung mit anschliessender Benetzung, und
  • Figur 3 eine weitere Ausführung der Vorrichtung zum Trocknen von Gegenständen.
It shows:
  • FIG. 1 shows schematically an apparatus for drying objects,
  • Figure 2 schematically shows a device for recovering valuable materials with subsequent wetting, and
  • Figure 3 shows another embodiment of the device for drying objects.

Die Figur 1 zeigt einen schematisch dargestellten Behälter 1, der als Wanne ausgebildet ist und z.B. in einer Strasse aus verschiedenen Behandlungsbehältern einer Anlage für die Oberflächenbehandlung von Gegenständen angeordnet ist. In einer solchen Anlage kann z.B. ein Verkupfern, Verchromen, Versilbern, allgemein z.B. Galvanisieren stattfinden, wobei unter anderem auch Elektrolytbäder, aber auch Bäder für stromlose Verfahren wie z.B. Entfetten, Beizen, Phosphatieren und aussenstromlose Metallabscheidungsbäder, aber auch Bäder für die anodische Oxydation von Aluminium, Bäder für die Tauchlackierung vorhanden sein können. Solche Anlagen sind allgemein in der Oberflächentechnik bekannt.Figure 1 shows a schematically illustrated container 1, which is designed as a trough and e.g. is arranged in a street consisting of various treatment containers of a system for the surface treatment of objects. In such a system, e.g. copper plating, chrome plating, silver plating, generally e.g. Electroplating takes place, among other things also electrolyte baths, but also baths for currentless processes such as Degreasing, pickling, phosphating and electroless metal deposition baths, but also baths for the anodic oxidation of aluminum, baths for dip painting can be present. Such systems are generally known in surface technology.

In diesem Behälter befinden sich die zu behandelnden Gegenstände 2, wobei aus Gründen der Uebersichtlichkeit der ebenfalls an sich bekannten Warenträger nicht gezeichnet ist. Entlang den zwei Längswänden des Behälters 1 sind Luftstrahlabgabeeinrichtungen angeordnete, welche wie folgt ausgebaut sind. Jede Luftstrahlabgabeeinrichtung weist einen Längsträger 3 auf, der in diesem Beispiel geführt in der Höhenrichtung des Behälters 1 bewegbar ist. Der Antrieb erfolgt in diesem Beispiel durch einen Motor 4 mit regelbarer Geschwindigkeit, welcher beispielsweise über Kettenzahnräder 5 und Ketten 6 mit den Längsträgern 3 antriebsverbunden ist. Dabei ist die Antriebsübertragung derart ausgelegt, dass die Längsträger gleichsinnig oder gegensinnig zueinander bewegbar sind, d.h. wenn sich z.B. der links gelegene Längsträger 3 von oben nach unten bewegt, bewegt sich der rechts gelegene Längsträger 3 gleichzeitig von unten nach oben.The objects 2 to be treated are located in this container, although for reasons of clarity the goods carrier, which is also known per se, is not shown. Air jet delivery devices are arranged along the two longitudinal walls of the container 1 and are configured as follows. Each air jet delivery device has a side member 3, which in this example guided in the height direction of the container 1 is movable. In this example, the drive is carried out by a motor 4 with adjustable speed, which is connected to the longitudinal beams 3 by means of chain sprockets 5 and chains 6, for example. The drive transmission is designed such that the side members can be moved in the same direction or in opposite directions to one another, ie if, for example, the side member 3 on the left moves from top to bottom, the side member 3 on the right simultaneously moves from bottom to top.

Mit jedem Längsträger ist eine Anzahl beidseitig abgeschlossener Röhrchen 7 verbunden. Die Röhrchen 7 sind miteinander axial ausgerichtet und verlaufen in diesem Beispiel horizontal. Die Anzahl der gezeigten Röhrchen 7 ist aus zeichnerischen Gründen rein beispielsweise. Es können z.B. 20 solcher Röhrchen 7 vorhanden sein.A number of tubes 7, closed on both sides, are connected to each longitudinal beam. The tubes 7 are axially aligned with one another and run horizontally in this example. The number of tubes 7 shown is purely for drawing reasons, for example. For example, 20 such tubes 7 may be present.

Jedes Röhrchen 7 weist Luftaustrittsöffnungen 8 auf, die entlang einer Mantellinie der jeweiligen Röhrchen 7 derart angeordnet sind, dass aus diesen austretende Luftstrahlen mindestens annähernd in horizontaler Richtung gegen die zu behandelnden Gegenstände 2 gerichtet sind. Als Beispiel sei angegeben, dass die axiale Länge der Röhrchen etwa 150 mm beträgt, wobei jedes Röhrchen je 15 Luftaustrittsöffnungen 8 in einem gegenseitigen Abstand von 10 mm enthält.Each tube 7 has air outlet openings 8 which are arranged along a surface line of the respective tubes 7 in such a way that air jets emerging therefrom are directed at least approximately in a horizontal direction against the objects 2 to be treated. As an example, it should be stated that the axial length of the tubes is approximately 150 mm, each tube containing 15 air outlet openings 8 at a mutual distance of 10 mm.

Die Pressluftversorgung erfolgt über einen Kompressor 9, welcher Luft aus der Umgebung ansaugt. Vom Kompressor 9 wird die Pressluft über Schlauchleitungen 10 den Röhrchen 7 zugeführt. Aus zeichnerischen Gründen ist jeweils nur eine Schlauchleitung 10 eingezeichnet. Es können auch mehrere Schlauchleitungen 10 vorhanden sein, die mindestens gruppenweise den Röhrchen 7 zugeführt sind. Die Pressluftzufuhr zu den einzelnen Röhrchen 7 wird durch Magnetventile 11 gesteuert, wobei jedem einzelnen Röhrchen ein solches Magnetventil 11 zugeorndet ist. Diese Magnetventile 11 sind einzeln über Steuerleitungen 12 mit einer Steuereinrichtung 13 verbunden, deren Funktion weiter unten erklärt sein wird. Weiter ist schematisch ein Abflussrohrstutzen 14 gezeichnet, über welchem die von den Gegenständen 2 abgeschlagene Flüssigkeit entfernt, möglicherweise entsorgt oder auch zu einer Behandlungsstufe der Anlage nach möglicher Aufbereitung zurückgeführt wird.The compressed air is supplied via a compressor 9, which sucks in air from the environment. The compressed air is fed from the compressor 9 to the tubes 7 via hose lines 10. For drawing reasons, only one hose line 10 is shown in each case. There can also be a plurality of hose lines 10 which are supplied to the tubes 7 at least in groups. The compressed air supply to the individual tubes 7 is controlled by solenoid valves 11, such a solenoid valve 11 being assigned to each individual tube. These solenoid valves 11 are individually connected via control lines 12 to a control device 13, the function of which will be explained below. Next is a schematic Drain pipe socket 14 is drawn, via which the liquid chipped off from the objects 2 is removed, possibly disposed of, or also returned to a treatment stage of the system after possible treatment.

Nachfolgend wird nun der Betrieb dieser beispielsweisen Ausführung zur Erläuterung des Verfahrens beschrieben. Dabei sei angenommen, dass diese Ausführung in einer Elektrolyse-Anlage eingesetzt ist und mittels welcher eine Rückgewinnung des Elektrolyten durchgeführt werden kann.The operation of this exemplary embodiment will now be described to explain the method. It is assumed here that this version is used in an electrolysis plant and by means of which the electrolyte can be recovered.

Es sei angenommen, dass die Gegenstände 2 nach erfolgter Behandlung in einer Elektrolysenzelle herausgehoben und in den Behälter 1 eingesetzt worden sind. Die Oberflächen der Gegenstände 2 sind folglich durch den Elektrolyten benetzt, welcher zur Rückgewinnung abgeblasen werden soll und über dne Abflussrohrstutzen 14 zurückgeführt wird.It is assumed that the objects 2 have been lifted out in an electrolysis cell and placed in the container 1 after the treatment. The surfaces of the objects 2 are consequently wetted by the electrolyte, which is to be blown off for recovery and is returned via the drain pipe socket 14.

Die Versorgung jedes Röhrchens 7 mit Pressluft erfolgt über ein diesem zugeordneten Magnetventil 11. Die Magnetventile 11 werden von einem Mikroprozessor in der Steuereinrichtung 13 angesteuert. Dabei lassen sich durch die Steuereinrichtung 13 sowohl die Oeffnungszeit der Magnetventile als auch die Frequenz des Oeffnens und Schliessens derselben je nach Anwendung einstellen. Der Druck der zugeführten Pressluft beträgt ungefähr 4 bis 6 bar. Weiter können die Magnetventile 11 derart durch die Steuereinrichtung 13 gesteuert werden, dass nicht alle Röhrchen 7 gleichzeitig beaufschlagt werden, sondern aufeinanderfolgend, gruppenweise, etc. Als Beispiel sei weiter angegeben, dass alle 0,4 Sekunden aus den jeweiligen Luftaustrittsöffnungen 8 ein Druckluftstoss erfolgt.Each tube 7 is supplied with compressed air via a magnetic valve 11 assigned to it. The magnetic valves 11 are controlled by a microprocessor in the control device 13. Both the opening time of the solenoid valves and the frequency of opening and closing them can be set by the control device 13 depending on the application. The pressure of the compressed air supplied is approximately 4 to 6 bar. Furthermore, the solenoid valves 11 can be controlled by the control device 13 in such a way that not all tubes 7 are acted upon simultaneously, but successively, in groups, etc. As an example, it should also be stated that a compressed air blast occurs from the respective air outlet openings 8 every 0.4 seconds.

Es werden also hochfrequent pulsierende, schlagartig erfolgende Stösse von Druckluftstrahlen auf die jeweiligen Gegenstände auftreffen. Damit wird die abzublasende Flüssigkeit vertrieben und fällt auf den Boden des Behälters 1 um abgeführt zu werden.So there will be high-frequency pulsating, sudden impacts of compressed air jets hitting the respective objects. The liquid to be blown off is thus expelled and falls to the bottom of the container 1 in order to be discharged.

Es ist nun bekannt, dass nur ein Teil der auf einer jeweiligen Oberfläche vorhandenen Flüssigkeit durch einen dagegen gerichteten Druckluftstrahl mitgerissen wird. Eine gewisse Flüssigkeitsmenge weicht lediglich seitlich aus und strömt, sobald kein Luftstrahl mehr gegen die betreffende Stelle gerichtet ist, beispielsweise aufgrund der Benetzungsfähigkeit, wieder zurück. Weitere Teilmengen können in Form von Tropfen hinter die Kanten der Gegenstände bewegt werden und während der Dauer des Luftstosses aus strömungstechnischen Gründen versteckt bleiben, um nach Abbrechen des Luftstosses, z.B. aufgrund der Schwerkraft, wieder zu einem Randbereich des Gegenstandes zurückwandern. Abhängig nun von der auf den Behältern vorhandenen Flüssigkeit, sei dies Waschwasser oder in diesem Fall ein Elektrolyt, erfolgt das Zurückkehren der nicht abgeblasenen Restmenge der Flüssigkeit bzw. der Tropfen nach einer gewissen, offensichtlich äusserst kurzen Zeitspanne. Entsprechend wird die Frequenz und Zeitdauer der Druckluftstösse gemäss Erfahrungswerten, erstweilig durchgeführte Versuchsläufe derart in der Steuereinrichtung 13 festgelegt, dass sobald die Restmenge der Flüssigkeit zum ursprünglichen Bereich zurückkehrt, der nächste Druckluftstoss auf dieselbe auftrifft, um ein erneutes Wegtreiben zu bewirken.It is now known that only part of the liquid present on a particular surface passes through a compressed air jet directed against it is entrained. A certain amount of liquid only escapes laterally and flows back as soon as no more air jet is directed against the area in question, for example due to the wetting ability. Further subsets can be moved in the form of drops behind the edges of the objects and remain hidden for fluidic reasons during the duration of the air blast, in order to move back to an edge region of the object after the air blast has broken off, for example due to gravity. Depending on the liquid present on the containers, be it wash water or an electrolyte in this case, the remaining amount of liquid or the drops that have not been blown off returns after a certain, obviously extremely short period of time. Correspondingly, the frequency and duration of the compressed air pulses are determined in the control device 13 in accordance with empirical values, test runs that have been carried out temporarily, such that as soon as the remaining quantity of the liquid returns to the original area, the next compressed air pulse hits it in order to cause it to drift away again.

Der Längsträger 3 mit den Röhrchen 7 wird äusserst langsam, z.B. 25 mm/Sekunde von oben nach unten bewegt, so dass zwei aufeinanderfolgende Druckluftstösse auf praktisch denselben Bereich auftreffen, so dass eigentlich die in senkrechter Richtung aufeinanderfolgenden Bereiche der Auftreffstellen der Druckluftstösse einander um ein Vielfaches überlappen, wobei die Verschiebung von zwei aufeinanderfolgenden Auftreffbereichen in senkrechter Richtung lediglich z.B. 10 mm beträgt. Währenddem sich der in Figur 1 links gelegene Düsenstock entlang der Gegenstände abwärts bewegt, bewegt sich der rechts gelegene aufwärts.The longitudinal beam 3 with the tubes 7 becomes extremely slow, e.g. Moved 25 mm / second from top to bottom, so that two successive bursts of compressed air hit practically the same area, so that actually the successive regions of the impact points of the compressed air bursts overlap each other by a multiple, with the displacement of two successive impact areas in the vertical direction just for example Is 10 mm. While the nozzle assembly on the left in FIG. 1 moves downward along the objects, the one on the right moves upward.

Es hat sich herausgestellt, dass durch das oben erwähnte Vorgehen in der Regel ein einmaliges Vorbeiziehen der Düsenstöcke an den Gegenständen genügt, um dieselben vollständig trocknen zu können, bzw. den Elektrolyten zu einem solchen Masse abzuschlagen, dass eine nur sehr dünne "Feuchtigkeitsschicht" auf den Gegenständen verbleibt, welche dann in einem nachfolgenden Bad der Gesamtanlage entfernt werden kann. Praktische Versuche haben ergeben, dass mit einem einmaligen Vorbeifahren der Düsenstöcke an den Gegenständen zwischen 95-98 % der Verschleppungsmenge des Elektrolyten abgeschlagen und damit zurückgewonnen werden kann. Voraussetzung für das Erreichen dieses hohen Wertes ist eine behandlungsgerechte Aufhängung der Teile. Es gibt keine Anlage, welche eine auch nur annähernd gleich grosse Rückgewinnungsziffer direkt ab dem Werkstück aufweisen kann.It has been found that the above-mentioned procedure generally suffices to pull the nozzle sticks once past the objects in order to be able to dry them completely, or towards the electrolytes to cut off such a mass that only a very thin "moisture layer" remains on the objects, which can then be removed in a subsequent bath of the overall system. Practical tests have shown that with a single pass of the nozzle sticks on the objects between 95-98% of the carryover amount of the electrolyte can be knocked off and thus recovered. A prerequisite for achieving this high value is that the parts are suspended in accordance with the treatment. There is no system that can have an approximately equal recovery number directly from the workpiece.

Die Figur 2 zeigt rein schematisch eine weitere Anwendung in einer Anlage zur Oberflächenbehandlung. Gezeigt ist wieder der Behälter 1 in rein schematischer Darstellung. In diesem Behälter 1 sind die zu trocknenden Gegenstände 2 sowie die Längsträger 3 mit den Röhrchen 7 gezeichnet.Figure 2 shows purely schematically another application in a system for surface treatment. The container 1 is again shown in a purely schematic representation. In this container 1, the objects 2 to be dried and the longitudinal members 3 are drawn with the tubes 7.

Ueber jedem Düsenstock 3, 7 für die Pressluft ist ein weiterer Düsenstock 16 für Spülwasser angeordnet, wobei bei dieser Ausführung Düsen für kleinste Wassermengen mit optimaler Streuung vorhanden sind.A further nozzle assembly 16 for flushing water is arranged above each nozzle assembly 3, 7 for the compressed air, and in this embodiment there are nozzles for the smallest amounts of water with optimal scattering.

Diese Ausführung ist zum Einsatz zum Beispiel zwischen einem Elektrolytbad und einer Sparspülvorrichtung bestimmt. Die aus dem Elektrolytbad herausgehobenen und in den Behälter 1 eingesetzten Gegenstände 2 werden vorerst gemäss dem oben erwähnten Vorgehen den Druckluftstössen ausgesetzt, um den Elektrolyten abzuschlagen und entsprechend zurückzugewissen. Jetzt soll jedoch verhindert werden, dass der noch filmförmig auf den Gegenständen verbleibende Elektrolytanteil vollständig eintrocknet. Dazu werden diese Gegenstände während dem ersten oder während einem zweiten Durchgang den Wasserstrahlen ausgesetzt, wobei die Wassermengen derart gewählt sind, dass der Restelektrolyt bis zum Einsetzen in das nachfolgende sogenannte Sparspülbad nicht eintrocknet.This version is intended for use, for example, between an electrolyte bath and an economy flushing device. The objects 2 lifted out of the electrolyte bath and inserted into the container 1 are initially exposed to the compressed air blasts in accordance with the above-mentioned procedure in order to knock off the electrolyte and to knock it back accordingly. However, it is now to be prevented that the electrolyte portion remaining on the objects in the form of a film dries out completely. For this purpose, these objects are exposed to the water jets during the first or during a second pass, the amounts of water being selected in such a way that the residual electrolyte does not dry out until it is inserted into the subsequent so-called economy rinse bath.

Die Figur 3 zeigt, wieder rein schematisch, eine weitere Ausführung, die insbesondere zum reinen Trocknen, also Abblasen von z.B. Spülwasser dient. Es ist bekanntlich ein Ziel sämtlicher Trocknungsarten, ein sogenanntes fleckenfreies Trocknen zu erreichen, d.h. dass keine Tropfen bzw. Tropfenspuren auf den getrockneten Gegenständen verbleiben. Da auch kleinste Tröpfchen durch die Luftstösse immer wieder noch weiter zerstört und abgeblasen werden, lässt sich mit dem erfindungsgemässen Verfahren das genannte Ziel visuell erreichen.FIG. 3 shows, again purely schematically, a further embodiment, in particular for pure drying, thus blowing off rinse water, for example. It is known that one goal of all types of drying is to achieve so-called spot-free drying, ie that no drops or traces of drops remain on the dried objects. Since even the smallest droplets are continuously destroyed and blown off by the air blasts, the above-mentioned goal can be achieved visually with the method according to the invention.

Der Behälter 1, der einen Innenbehälter 18 mit oben eingebogenen Randabschnitten 15 aufweist, enthält gemäss der zeichnerischen Darstellung der Figur 3 die zu trocknenden Gegenstände 2 und die Düsenstücke 3, 7. Der Behälter 1 weist weiter bei den Seitenwänden und beim Boden ein Wärmeschutzmantel, eine thermische Isolation 17 auf. Der Raum zwischen der Wand des Behälters 1 und dem Innenbehälter ist als Strömungskanal 19 ausgebildet, der zum Innenraum des Behälters 1 führt.The container 1, which has an inner container 18 with bent-in edge sections 15, contains, according to the drawing in FIG. 3, the objects 2 to be dried and the nozzle pieces 3, 7. The container 1 also has a heat protection jacket, one on the side walls and one on the bottom thermal insulation 17. The space between the wall of the container 1 and the inner container is designed as a flow channel 19 which leads to the interior of the container 1.

Bei dieser Ausführung wird wieder die Flüssigkeit an den Oberflächen der Gegenstände 2 durch die Pressluftstösse weggeschlagen, die Tropfen fliegen oder strömen auf den Boden des Behälters 1, um hier durch einen (nicht gezeigten) Abflussstutzen wegzuströmen. Es ist nun offensichtlich, dass im Falle von Wasser eine gewisse Wasseraufnahme der im Behälter 1 vorhandenen Luft stattfindet. Im Boden der Wanne ist an einer Stelle zwischen demselben und dem Zwischenboden 20 ein oder mehrere Gebläse 21 angeordnet. Diese Gebläse 21 saugen die feuchte Luft aus dem Innenraum des Behälters 1 und fördern dieselbe durch Trocknungseinrichtungen 22. Von diesen Trocknungseinrichtungen 22 strömt die wiedergetrocknete Luft, siehe Pfeil 23, in den als Strömungskanal 19 wirkenden Zwischenraum zwischen dem Innenbehälter 18 und der Aussenwand des Behälters 1, um durch die Durchtritte 19 wieder in den eigentlichen Behandlungsraum einzuströmen. Hier wird somit zusätzlich zu dem rein mechanischen Abschlagen der Wassertröpfchen die sich in der Luft im Behälter 1 bildende Feuchtigkeit der Luft durch den beschriebenen, Gebläse 21 und Trocknungseinrichtungen 22 enthaltende Kreislauf vernichtet, so dass immer wieder erneut trockene Luft in den Behandlungsraum einströmt.In this embodiment, the liquid on the surfaces of the objects 2 is knocked off again by the compressed air blasts, the drops fly or flow to the bottom of the container 1 in order to flow away through a drain connection (not shown). It is now evident that in the case of water there is a certain water absorption of the air present in the container 1. One or more fans 21 are arranged in the bottom of the trough at a point between the same and the intermediate floor 20. These blowers 21 suck the moist air from the interior of the container 1 and convey it through drying devices 22. From these drying devices 22, the re-dried air flows, see arrow 23, into the space acting as a flow channel 19 between the inner container 18 and the outer wall of the container 1 to flow back through the passages 19 into the actual treatment room. Here, in addition to the purely mechanical knocking off of the water droplets, the moisture in the air which forms in the air in the container 1 is destroyed by the circuit described, which includes blowers 21 and drying devices 22, so that again and again dry air flows into the treatment room.

Claims (2)

  1. Apparatus for blowing off a liquid from an article wetted by same, including a receptacle (1) for receipt of the articles (2) to be dried, in which receptacle (1) two air flow discharge devices located at a mutual distance are present, between which the respective articles to be treated can be inserted, and including a drive drivingly connected to the air flow discharge devices in such a manner that in operation they are moved parallel and in opposite directions to each other, whereby each air flow discharge device comprises a series of tubes (7) arranged aside of each other, aliged with each other in axial direction and communicating with a source of pressurized air, of which each includes a number of pressurized air outlet openings (8) which are arranged in such a manner that the jets of pressurized air emitted by the two air flow discharge devices are directed against each other, whereby a plurality of high frequent pulsating, burst-like occurring blasts of jets of pressurized air extending at least approximately parallel to each other are directed against the articles in order to drive the liquid off, and a relative movement directed at least approximately perpendicularly to the direction of flow of the jets of pressurized air is produced between the air jet emitting devices and the articles to be dried.
  2. Apparatus of claim 1, characterized in that every tube (7) communicates via a separate control valve (11) with the source of pressurized air, whereby all control valves are connected to a control device (13) by means of which the duration of the open state and the frequency of the opening of every control valve can be set individually.
EP90122063A 1990-11-19 1990-11-19 Apparatus for blowing off a liquid from an article Expired - Lifetime EP0486711B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE59006720T DE59006720D1 (en) 1990-11-19 1990-11-19 Device for blowing off a liquid from an object.
EP90122063A EP0486711B1 (en) 1990-11-19 1990-11-19 Apparatus for blowing off a liquid from an article
AT90122063T ATE109553T1 (en) 1990-11-19 1990-11-19 DEVICE FOR BLOWING A LIQUID FROM AN OBJECT.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP90122063A EP0486711B1 (en) 1990-11-19 1990-11-19 Apparatus for blowing off a liquid from an article

Publications (2)

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EP0486711A1 EP0486711A1 (en) 1992-05-27
EP0486711B1 true EP0486711B1 (en) 1994-08-03

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EP (1) EP0486711B1 (en)
AT (1) ATE109553T1 (en)
DE (1) DE59006720D1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
DE102013020096A1 (en) * 2013-11-30 2015-06-03 Ludy Galvanosysteme Gmbh Method and device for drying galvanized material

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Publication number Priority date Publication date Assignee Title
DE4433037A1 (en) * 1993-10-05 1995-04-06 Lpw Anlagen Gmbh Method for activating surfaces on objects which undergo electroplating
DE4336085A1 (en) * 1993-10-22 1995-04-27 Atotech Deutschland Gmbh Method for removing liquid from the surface of a wetted material to be treated and arrangement for carrying out the method
DE4421010B4 (en) * 1994-06-20 2004-04-15 Lpw-Anlagen Gmbh Process for cleaning objects as part of a galvanotechnical treatment of objects in a galvanotechnical system and systems for carrying out the method
CH691927A5 (en) * 1996-08-16 2001-11-30 Galvatec Gmbh Device for pulsed dispensing of a medium for treating surfaces.
US5879532A (en) * 1997-07-09 1999-03-09 Masco Corporation Of Indiana Process for applying protective and decorative coating on an article
DE10038202C1 (en) * 2000-08-04 2002-04-18 Senit Gmbh & Co Kg Method and device for drying objects

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GB787281A (en) * 1955-06-21 1957-12-04 Wilfred Adshead Improvements in coated paper drying machines
DE1272267B (en) * 1963-03-30 1968-07-11 Elitex Zavody Textilniho Nozzle for a nozzle dryer for drying textiles in particular
EP0205819B1 (en) * 1985-06-27 1990-10-31 Roag System for the stainless drying of objects with surfaces wetted by a liquid

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013020096A1 (en) * 2013-11-30 2015-06-03 Ludy Galvanosysteme Gmbh Method and device for drying galvanized material
DE102013020096B4 (en) * 2013-11-30 2021-02-25 Ludy Galvanosysteme Gmbh Method and device for drying items to be electroplated

Also Published As

Publication number Publication date
ATE109553T1 (en) 1994-08-15
EP0486711A1 (en) 1992-05-27
DE59006720D1 (en) 1994-09-08

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