EP0486711A1 - 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
EP0486711A1
EP0486711A1 EP90122063A EP90122063A EP0486711A1 EP 0486711 A1 EP0486711 A1 EP 0486711A1 EP 90122063 A EP90122063 A EP 90122063A EP 90122063 A EP90122063 A EP 90122063A EP 0486711 A1 EP0486711 A1 EP 0486711A1
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EP
European Patent Office
Prior art keywords
compressed air
air jets
liquid
compressed
jets
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Granted
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EP90122063A
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German (de)
French (fr)
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EP0486711B1 (en
Inventor
Ernst Eichholzer
Alfred Schnyder
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Eichholzer Ernst
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Individual
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Priority to AT90122063T priority Critical patent/ATE109553T1/en
Priority to EP90122063A priority patent/EP0486711B1/en
Priority to DE59006720T priority patent/DE59006720D1/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 method for blowing off a liquid from an object wetted by the same, and an apparatus for carrying out the method.
  • the invention seeks to remedy this.
  • the invention as characterized in the claims, achieves the object of showing a method and an apparatus for blowing off a liquid from liquid from an object wetted by the same, in which compressed air jets are suddenly pulsed towards the object to be dried.
  • Figure 1 shows a schematically illustrated container 1, which is designed as a trough and e.g. is arranged in a street made up of various treatment containers of a system for the surface treatment of objects.
  • a system for the surface treatment of objects.
  • a system e.g. copper plating, chrome plating, silver plating, generally e.g.
  • Electroplating takes place, including electrolyte baths, but also baths for electroless 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.
  • electrolyte baths but also baths for electroless 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.
  • electroless processes such as Degreasing, pickling, phosphating and electroless metal deposition baths, but also bath
  • Air jet delivery devices are arranged along the two longitudinal walls of the container 1 and are constructed 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 in such a way 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, which are 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 reasons of drawing, 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 to a control device 13 via control lines 12, the function of which will be explained below.
  • a schematic Discharge 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 solenoid valve 11 assigned to it.
  • the solenoid valves 11 are controlled by a microprocessor in the control device 13.
  • the control device 13 can be used to set both the opening time of the solenoid valves and the frequency of opening and closing them 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 on simultaneously, but successively, in groups, etc. As an example, it is further 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 residual amount of the liquid returns to the original area, the next compressed air pulse hits it in order to drive it away again.
  • the longitudinal beam 3 with the tubes 7 becomes extremely slow, e.g. 25 mm / second moved from top to bottom, so that two successive compressed air blows hit practically the same area, so that actually the successive areas of the impact points of the compressed air blasts overlap one another by a multiple, whereby 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 optimum dispersion.
  • 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 such that the residual electrolyte does not dry out until it is inserted into the subsequent so-called economy rinse bath.
  • FIG. 3 shows, again in a purely schematic manner, a further embodiment, which is especially for 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 on the side walls and on the bottom, one 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 tub 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.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Drying Of Solid Materials (AREA)
  • Detergent Compositions (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

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 ein Verfahren zum Abblasen einer Flüssigkeit von einem mit derselben benetzten Gegenstand, und eine Vorrichtung zur Durchführung des Verfahrens.The present invention relates to a method for blowing off a liquid from an object wetted by the same, and an apparatus for carrying out the method.

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 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.

Hier will die Erfindung Abhilfe schaffen. Die Erfindung, wie sie in den Ansprüchen gekennzeichnet ist, löst die Aufgabe, ein Verfahren und eine Vorrichtung zum Abblasen einer Flüssigkeit von Flüssigkeit von einem mit derselben benetzten Gegenstand zu zeigen, bei denen Druckluftstrahlen schlagartig pulsierend stossweise gegen den zu trocknenden Gegenstand gerichtet werden.The invention seeks to remedy this. The invention, as characterized in the claims, achieves the object of showing a method and an apparatus for blowing off a liquid from liquid from an object wetted by the same, in which compressed air jets are suddenly pulsed towards the object to be dried.

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.The advantages achieved by the invention are essentially to be seen in the fact that liquid droplets which, for aerodynamic reasons, have only evaded during a first compressed air blast and which return to the original position after the end of this compressed air blast, are hit and blown up by the immediately following compressed air blast. This allows drying of wetted objects faster and better.

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 zur Durchführung des erfindungsgemässen Verfahrens,
  • Figur 2 schematisch eine Vorrichtung zur Wertstoffrückgewinnung mit anschliessender Benetzung, und
  • Figur 3 eine Vorrichtung zum Trocknen von Gegenständen.
It shows:
  • FIG. 1 shows schematically an apparatus for carrying out the method according to the invention,
  • Figure 2 schematically shows a device for recovering valuable materials with subsequent wetting, and
  • Figure 3 shows a 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 made up 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, including electrolyte baths, but also baths for electroless 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 bekannte Warenträger nicht gezeichnet ist. Entlang den zwei Längswänden des Behälters 1 sind Luftstrahlabgabeeinrichtungen angeordnet, welche wie folgt aufgebaut 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, the goods carrier, which is also known per se, not being drawn for reasons of clarity. Air jet delivery devices are arranged along the two longitudinal walls of the container 1 and are constructed 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 in such a way 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, which are 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 reasons of drawing, 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 to a control device 13 via control lines 12, the function of which will be explained below. Next is a schematic Discharge 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 is now 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 solenoid valve 11 assigned to it. The solenoid valves 11 are controlled by a microprocessor in the control device 13. The control device 13 can be used to set both the opening time of the solenoid valves and the frequency of opening and closing them 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 on simultaneously, but successively, in groups, etc. As an example, it is further 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 auftrffen. Damit wird die abzublasende Ware 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 on the respective objects. The goods to be blown off are thus distributed and fall 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 washing water or an electrolyte in this case, the remaining amount of the liquid or the drops not 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 residual amount of the liquid returns to the original area, the next compressed air pulse hits it in order to drive it 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. 25 mm / second moved from top to bottom, so that two successive compressed air blows hit practically the same area, so that actually the successive areas of the impact points of the compressed air blasts overlap one another by a multiple, whereby 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 according to 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 optimum dispersion.

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 such 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 in a purely schematic manner, a further embodiment, which is especially for 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 portions 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 on the side walls and on the bottom, one 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 tub 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 (8)

Verfahren zum Abblasen einer Flüssigkeit von einem mit derselben benetzten Gegenstand, dadurch gekennzeichnet, dass eine Vielzahl hochfrequent pulsierende, schlagartig erfolgende Stösse von mindestens annähernd parallel zueinander verlaufenden Druckluftstrahlen gegen den Gegenstand gerichtet werden um die Flüssigkeit wegzutreiben, und dass zwischen den Druckluftstrahlen und dem zu trocknenden Gegenstand eine mindestens annähernd senkrecht zur Strömungsrichtung der Druckluftstrahlen gerichtete Relativbewegung erzeugt wird.Method for blowing off a liquid from an object wetted with the same, characterized in that a large number of high-frequency pulsating, abrupt impacts of at least approximately parallel compressed air jets are directed against the object in order to drive the liquid away, and that between the compressed air jets and the one to be dried Subject is generated at least approximately perpendicular to the direction of flow of the compressed air jets relative movement. Verfahren nach Patentanspruch 1, dadurch gekennzeichnet, dass der zu trocknende Gegenstand von zwei entgegengesetzten Seiten her von Druckluftstrahlen angeblasen wird.Method according to claim 1, characterized in that the object to be dried is blown from two opposite sides by compressed air jets. Verfahren nach Patentanspruch 2, dadurch gekennzeichnet, dass zwischen den entgegengesetzt gerichteten Druckluftstrahlen eine Relativbewegung erzeugt wird, die mindestens annähernd senkrecht zur Strömungsrichtung der Druckluftstrahlen gerichtet ist.Method according to claim 2, characterized in that a relative movement is generated between the oppositely directed compressed air jets which is directed at least approximately perpendicular to the direction of flow of the compressed air jets. Verfahren nach Patentanspruch 2 oder 3, dadurch gekennzeichnet, dass die von einer jeweiligen Seite her gegen den Gegenstand gerichteten Druckluftstrahlen in einer Reihe angeordnet sind, die mindestens annähernd rechtwinklig zur Richtung der jeweiligen Relativbewegung verläuft.Method according to claim 2 or 3, characterized in that the compressed air jets directed against the object from a respective side are arranged in a row which is at least approximately at right angles to the direction of the respective relative movement. Verfahren nach Patentanspruch 4, dadurch gekennzeichnet, dass die jeweils in einer Reihe ausgerichteten Druckluftstrahlen gruppenweise gleichzeitig stossweise pulsieren.A method according to claim 4, characterized in that the compressed air jets respectively aligned in a row pulsate in groups at the same time intermittently. Verfahren nach einem der vorangehenden Patentansprüche, dadurch gekennzeichnet, dass die Frequenz der Druckluftstösse abhängig von der wegzutreibenden Flüssigkeit und dem zu trocknenden Gegenstand derart gewählt wird, dass das Intervall zwischen aufeinanderfolgenden Druckluftstössen gleich gross wie die Zeitdauer ist, welche mindestens ein Teil der nicht durch einen vorgängigen Druckluftstoss weggetriebene Restmenge der Flüssigkeit aufgrund der Benetzungsfähigkeit oder Schwerkraft zur Rückkehr zur ursprünglichen Auftreffstelle des vorgängigen Druckluftstosses benötigt, derart, dass mindestens dieser Teil der Restmenge einem folgenden Druckluftstoss zum erneuten Wegtreiben ausgesetzt wird.Method according to one of the preceding claims, characterized in that the frequency of the compressed air blasts is selected depending on the liquid to be driven away and the object to be dried is that the interval between successive blasts of compressed air is the same as the length of time that at least a part of the remaining amount of the liquid not expelled by a previous blast of compressed air requires due to the wettability or gravity to return to the original point of impact of the previous blast of compressed air, such that at least this part the remaining quantity is subjected to a subsequent blast of compressed air to drive it away again. Vorrichtung zur Durchführung des Verfahrens nach einem der vorangehenden Patentansprüche, gekennzeichnet durch einen Behälter zur Aufnahme der zu trocknenden Gegenstände, in welchem Behälter zwei in einem gegenseitigen Abstand angeordnete Luftstrahlabgabeeinrichtungen vorhanden sind, zwischen welchen die jeweils zu behandelnden Gegenstände einsetzbar sind, durch einen mit den Luftstrahlabgabeeinrichtungen derart antriebsverbundenen Antrieb, dass dieselben im Betrieb parallel und gegensinnig zueinander bewegt werden, wobei jede Luftstrahlabgabeeinrichtung eine Folge nebeneinander angeordnete, in axialer Richtung miteinander ausgerichtete und mit einer Druckluftquelle in Verbindung stehende Rohrstücke enthält, wovon jedes eine Anzahl Druckluftaustrittsöffnungen aufweist, die derart angeordnet sind, dass die von den zwei Luftstrahlabgabeeinrichtungen abgegebenen Druckluftstrahlen gegeneinander gerichtet sind.Device for carrying out the method according to one of the preceding claims, characterized by a container for receiving the objects to be dried, in which container there are two air jet dispensing devices arranged at a mutual distance, between which the objects to be treated can be inserted, by one with the air jet dispensing devices drive-connected drive in such a way that they are moved parallel and in opposite directions to one another during operation, each air jet delivery device containing a sequence of tube pieces arranged side by side, aligned in the axial direction and connected to a compressed air source, each of which has a number of compressed air outlet openings which are arranged in such a way that the compressed air jets emitted by the two air jet delivery devices are directed towards one another. Vorrichtung nach Patentanspruch 7, dadurch gekennzeichnet, dass jedes Rohrstück über ein gesondertes Steuerventil mit der Druckluftquelle in Verbindung steht, wobei alle Steuerventile mit einer Steuereinrichtung verbunden sind, mittels der die Oeffnungsdauer und Oeffnungsfrequenz jedes Steuerventils einzeln festlegbar ist.Device according to claim 7, characterized in that each pipe section is connected to the compressed air source via a separate control valve, all control valves being connected to a control device by means of which the opening duration and opening frequency of each control valve can be individually determined.
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
AT90122063T ATE109553T1 (en) 1990-11-19 1990-11-19 DEVICE FOR BLOWING A LIQUID FROM AN OBJECT.
EP90122063A EP0486711B1 (en) 1990-11-19 1990-11-19 Apparatus for blowing off a liquid from an article
DE59006720T DE59006720D1 (en) 1990-11-19 1990-11-19 Device for blowing off a liquid from an object.

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EP90122063A EP0486711B1 (en) 1990-11-19 1990-11-19 Apparatus for blowing off a liquid from an article

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

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DE4433037A1 (en) * 1993-10-05 1995-04-06 Lpw Anlagen Gmbh Method for activating surfaces on objects which undergo electroplating
EP0650022A1 (en) * 1993-10-22 1995-04-26 ATOTECH Deutschland GmbH Process and arrangement for the stainless removal of fluids adhering to surfaces of objects
WO1998008040A1 (en) * 1996-08-16 1998-02-26 Galvatec Gmbh Device for intermittent dispensing of an agent for treating surfaces
EP0890659A2 (en) * 1997-07-09 1999-01-13 Masco Corporation Of Indiana Process for applying protective and decorative coating on an article
EP1178273A1 (en) * 2000-08-04 2002-02-06 Senit GmbH &amp; Co KG Process and apparatus for drying objects
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

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DE102013020096B4 (en) * 2013-11-30 2021-02-25 Ludy Galvanosysteme Gmbh Method and device for drying items to be electroplated

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DE1272267B (en) * 1963-03-30 1968-07-11 Elitex Zavody Textilniho Nozzle for a nozzle dryer for drying textiles in particular
EP0205819A1 (en) * 1985-06-27 1986-12-30 Roag System for the stainless drying of objects with surfaces wetted by a liquid

Cited By (13)

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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
EP0650022A1 (en) * 1993-10-22 1995-04-26 ATOTECH Deutschland GmbH Process and arrangement for the stainless removal of fluids adhering to surfaces of objects
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
WO1998008040A1 (en) * 1996-08-16 1998-02-26 Galvatec Gmbh Device for intermittent dispensing of an agent for treating surfaces
FR2765893A1 (en) * 1997-07-09 1999-01-15 Masco Corp METHOD FOR APPLYING A PROTECTIVE AND DECORATIVE COATING ON AN ARTICLE
GB2327091A (en) * 1997-07-09 1999-01-13 Masco Corp Process for applying protective and decorative coating on an article
US5879532A (en) * 1997-07-09 1999-03-09 Masco Corporation Of Indiana Process for applying protective and decorative coating on an article
EP0890659A3 (en) * 1997-07-09 1999-06-16 Masco Corporation Of Indiana Process for applying protective and decorative coating on an article
GB2327091B (en) * 1997-07-09 2002-06-05 Masco Corp Process for applying protective and decorative coating on an article
EP0890659A2 (en) * 1997-07-09 1999-01-13 Masco Corporation Of Indiana Process for applying protective and decorative coating on an article
US7045039B2 (en) * 1997-07-09 2006-05-16 Masco Corporation Of Indiana Process for applying protective and decorative coating on an article
EP1178273A1 (en) * 2000-08-04 2002-02-06 Senit GmbH &amp; Co KG Process and apparatus for drying objects

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EP0486711B1 (en) 1994-08-03
DE59006720D1 (en) 1994-09-08

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