DE60110607T2 - DEVICE FOR APPLYING A COATING LIQUID TO A PANEL - Google Patents

Abstract

The invention concerns a device for applying a coating liquid on a metal sheet comprising a lower shell (33) forming a recuperating container and an upper shell (34) mutually mobile between a closed position wherein they form a closed chamber containing feeding means, a collecting cylinder (3) and transfer means and an open position wherein they are spaced apart from each other, a container of cleaning liquid reserve (53), a container of coating liquid reserve (36), a compressed air source (47), first circulating means capable of supplying to the feeding means, in open position of the chamber, coating liquid from a coating liquid reserve container (36), second circulating means capable of supplying, in closed position of the chamber, a cleaning liquid from a cleaning liquid reserve container (53), and spraying means (39) capable of spraying cleaning liquid through at least one of the two shells to wash the elements contained in the chamber in closed position.

Description

• – einen rotierenden Auflagezylinder, um den kontinuierlich ein Blech läuft,
• – Versorgungsmittel zur Versorgung mit Beschichtungsflüssigkeit,
• – einen rotierenden Flüssigkeitsfilm-Sammelzylinder, der durch die Versorgungsmittel versorgt wird, und
• – eventuell Übertragungsmittel zur Übertragung des Flüssigkeitsfilms von dem Sammelzylinder auf das um den Auflagezylinder Taufende Blech.

This invention relates to an apparatus for applying coating fluid to a sheet comprising

• A rotating support cylinder around which a sheet continuously runs,
• Supply means for supplying coating liquid,
• A rotating liquid-film collecting cylinder supplied by the supply means, and
• - If necessary, transfer means for transferring the liquid film from the collecting cylinder to the baptizing on the support cylinder sheet.

since have long been devices for applying liquid paint known on moving sheet metal. Generally a pan, color box called used, from which a rubberized cylinder takes the color and transfers them to one or more consecutive cylinders, wherein The last one is an order cylinder, which is the color on the metal band who passes by and on a big one Support cylinder supported is (see, for example, US-A-4,046,931).

These Devices for applying coating liquids must be cleaned regularly become. Document US-A-3227078 shows a cleaning device according to the preamble of Claim 1. The cleaning is very complex and time consuming and requires size Quantities of detergent. Furthermore This cleaning is generally carried out by hand today. This There are many risks to this process the workers, since the evaporating gases are poisonous and quickly inflammable.

The The aim of this invention is to solve these problems and to develop a device that has the above disadvantages does not have.

Ideally This device should be able to be cleaned quickly and effectively.

• – eine einen Rückgewinnungsbehälter bildende unter Schale und eine obere Schale, die gegenseitig bewegbar sind zwischen einer geschlossenen Position, in der sie eine geschlossene Kammer bilden, welche die Versorgungsmittel, den Sammelzylinder und die Übertragungsmittel einschließt, und einer offenen Position, in der sie voneinander entfernt sind,
• – einen Vorratsbehälter für Reinigungsflüssigkeit,
• – einen Vorratsbehälter für Beschichtungsflüssigkeit,
• – eine Druckluftquelle,
• – erste Zirkulationsmittel, die in der Lage sind, den Versorgungsmittel bei offener Position der Kammer Beschichtungsflüssigkeit aus dem Vorratsbehälter für Beschichtungsflüssigkeit zuzuführen,
• – zweite Zirkulationsmittel, die in der Lage sind, den Versorgungsmitteln bei geschlossener Position der Kammer Reinigungsflüssigkeit aus dem Vorratsbehälter für Reinigungsflüssigkeit zuzuführen,
• – Sprühmittel, die in der Lage sind, Reinigungsmittel durch wenigstens eine der zwei Schalen zu sprühen, um die von der Kammer in geschlossener Position eingeschlossenen Elemente zu spülen, und
• – eventuell Einleitungsmittel zum Einleiten von Druckgas durch wenigstes eine der zwei Schalen, um die von der Kammer in geschlossener Position eingeschlossenen Teile zu trocknen.

These problems can be solved by a device as described above and which further comprises a flushing device comprising:

• A shell forming a recovery bin and an upper shell mutually movable between a closed position in which they form a closed chamber enclosing the supply means, the collecting cylinder and the transfer means and an open position in which they are separated are,
• A reservoir for cleaning fluid,
• A reservoir for coating liquid,
• A compressed air source,
• First circulating means capable of supplying coating liquid to the supply means in the open position of the chamber from the coating liquid storage container,
• Second circulating means capable of supplying cleaning liquid to the supply means from the cleaning liquid supply tank when the chamber is closed,
• Spraying means capable of spraying detergent through at least one of the two trays to rinse the elements enclosed by the chamber in the closed position, and
• - possibly introducing means for introducing compressed gas through at least one of the two shells to dry the parts enclosed by the chamber in the closed position.

The Movement and operation of certain or all of these means can be done by hand or automatically.

These Device allows a reduction of the cleaning time and the required amount Cleaning fluid it is generally a solvent for the coating fluid as well as a major improvement in safety and hygiene, because of the solvent released vapors enclosed in a closed chamber from where they pass through an ordinary one Method can be sucked.

According to one particular implementation The invention comprises the flushing device as the first and second circulation means a circulation pump and a Circuit, which is a supply line to the Introducing either coating or cleaning fluid into the supply means and a discharge line for draining of either coating or cleaning liquid from the recovery tank. It is therefore advantageous if this example device has a single Cycle for the supply of coating liquid and for cleaning the supply means.

According to one advantageous embodiment the invention serve the spray for liquid at the same time as an introduction for gas. This device is very simple and easy to use.

Other Implementing forms the device according to the invention are included in the appended claims.

Other Details and characteristics of the invention will become apparent from the following Description, which is not limiting and referring to the accompanying drawings refers.

The 1 and 2 show a schematic representation of implementation variants of devices for applying coating liquid to sheet metal.

3 shows a detail of 1 ,

The 4 to 9 show an implementation form according to the invention with flushing device, at different moments of application.

On 1 a very simple embodiment according to the invention was shown, the rotating support cylinder 1 Includes, to continuously a sheet metal or metal strip 2 running. The pressed band 2 passes through the adjustable gap between the support cylinder 1 and a cylinder 3 , called collecting cylinder, whose peripheral surface is ideally made of a rubber-like material. The collection cylinder 3 turns in the opposite direction to the support cylinder. A supply tank 4 containing coating liquid applied to the tape 2 must be applied, is opposite the collecting cylinder 3 attached so that it is on the long side. This supply tank 4 is on 3 shown in more detail; in the illustrated case it has the shape of an approximately prismatic supply trough. The gutter 4 is open at the top and includes a front wall 5 preferably parallel to the axis 6 of the collecting cylinder 3 is and is located approximately vertically to this. The gutter also includes a sub-wall 7 starting from the base of the front 5 runs obliquely upwards and at the lower angle of the channel thus formed an opening 8th for those in the gutter 4 forms contained liquid.

A flexible squeegee 9 is movable on the lower wall in the example shown 7 arranged so that they extend more or less along the outer wall of the collecting cylinder 3 can extend. In order to make this possible, in the example shown there is the flexible squeegee 9 of several superimposed leaves, all of which have an elongated opening, through which they are adjustable on the rear wall 7 can be attached. For this purpose, bolts were used in this example 14 , Wing nuts 15 and plates, which also have an elongated hole. In this way, the distance between the blades of the doctor and the collecting cylinder can be changed, whereby these sheets are bent more or less strongly and the pressure exerted by the doctor blade and the amount of ink applied to the peripheral surface of the cylinder 3 get changed.

The illustrated supply trough 4 also includes two side walls 18 and a back wall 20 ,

The gutter is on a support bar 21 attached, which is arranged so that it is about its axis 22 with the help of unillustrated taxpayers. So can the outlet opening 8th be adjusted by changing the inclination of the channel by a rotation of the channel about the axis 22 , This allows the pressure of the squeegee on the collecting cylinder 3 reduce or increase the desired color flow accordingly.

All enable these funds that is, the coating liquid with a pressure on the collecting cylinder, the perfect to the needs which eliminates the problem of dewetting and the needed amount of liquid is reduced.

In the lower side edges of the depicted gutter 4 Two drains may be provided, one of which is shown and the number 23 equivalent. These drains make it possible to discharge through the discharge lines all liquids that overflow into the drains. As a result, the liquid level in the supply tank is always kept the same. baffles 28 on the lower wall 7 attached, distribute the coating liquid and are supplied by a supply line 30 in the upper part of the gutter 4 ,

So circulates the coating liquid always evenly in the Gutter, from top to bottom, at a speed that is accurate on the amount of liquid is tuned, which flows through the flexible squeegee. This allows it that only a quarter of the amount of fluid that normally when using a color box is required; Furthermore Thus, the disadvantages associated with the impurities are avoided that are in it. The device becomes so continuous with a liquid supplied, which is preferably filtered and constantly the correct temperature and viscosity having.

How out 2 It can also be provided that the collecting cylinder, the coating liquid through one or more intermediate cylinder 31 and 32 on the tape 2 transfers.

Other supplies than those on the 1 and 3 may also be considered by those skilled in the art. At the on 2 The example of implementation has become a classic color box 27 shown. The dashed line shows an additional execution tion form, with an additional cylinder 29 on the collecting cylinder 3 rests, wherein the coating liquid is guided into the gap between these two cylinders, so that a meniscus is formed, from which the liquid by gravity from the collecting cylinder 3 is pulled along.

Like from the 4 to 9 As can be seen, the device according to the invention comprises a flushing device. This includes a recovery tank 33 which has the shape of a shell in the example shown. This shell 33 For example, it can trap any excess liquid that leaks sideways out of the collection cylinder, the flexible squeegee, or the intermediate cylinders. A drain line 34 that with a valve 35 is provided, which allows in the container 33 contained liquid in a container for coating liquid 36 allow the liquid to be recycled (see 4 and 9 ) or in a container for used cleaning fluid 53 (please refer 5 - 8th ).

The on the 4 to 9 The device shown comprises a flushing device, in addition to the lower shell described above 33 an upper shell 37 includes. The upper shell is preferably with an outlet conduit 38 for the vapors and with spray nozzles 39 equipped with a flexible supply line 40 may be connected, preferably with a valve 41 Is provided.

The shells are mutually movable, which is already known and not shown, and thus can form a closed chamber in the approximate position, as they are, for example 5 is shown.

The supply line 30 that with a valve 42 equipped, is a flexible pipe connected to the outlet of a circulation pump 43 connected is.

The output of this pump 43 is also with the flexible supply line 40 through a pipe 44 connected at both ends via a valve 45 and 46 features.

An air compressor 47 is also with the flexible supply line 40 connected by a pipe 48 that with a valve 49 Is provided.

The entrance of the circulation pump 43 is with a flexible feed tube 50 connected with a valve 51 equipped with a suction lance 52 , This lance 52 Optionally in the container for coating liquid 36 (please refer 9 ) or in the used cleaning fluid container 53 (please refer 5 ) or in no container at all (see 4 and 6 to 8th ) are dipped.

The entrance of the circulation pump 43 is also with two pipes 54 and 55 provided, each with a valve 56 and 57 are equipped; one of the tubes is one in the used cleaning fluid container 53 dipped and the other in the container for fresh cleaning fluid 58 ,

In the container 53 can be an exit 59 to a container for recycling detergent 60 be provided.

at in the example shown the valves, the circulation pump and the compressed air source according to a automatic program are put into operation. The opening and the closing the valves are automatically controlled and their positions are shown on the pictures and are therefore not described in detail.

After the coating phase, the cleaning of the device may be required. After the support cylinder 1 and the other cylinders have been removed from each other in a known manner, the operator begins to discharge the coating liquid from the supply line, as on 4 shown. The suction lance 52 sucks in air from the tank before 36 has entered. The air moves through the pipe 50 , the circulation pump 43 and the supply line 30 , It thus frees the supply circuit from the coating liquid in the lower shell 33 is caught and in the container 36 is recycled.

As the 5 shows, the operator dives the suction lance 52 as well as the drainage line 34 into the used cleaning fluid container 53 , It is therefore the same circuit that has served to supply the coating liquid used for draining this circuit and for introducing the detergent.

The upper shell 37 and the lower shell 33 are now in the closed position and the cleaning fluid will, for example, 10 minutes, rinse the circuit for supply of coating liquid.

As the 6 shows, the suction lance 52 back out of the container 53 removed. Through the pipe 55 For about 2 minutes, cleaning fluid is injected into the interior of the chamber forming the trays through the nozzles 39 , The liquid thus cleans the entire device and the used cleaning liquid flows into the container 53 back.

During a possible next phase, which takes for example 15 seconds and on the 7 is shown, the valve 57 closed and the valve 56 open, allowing fresh cleaning fluid from the container 58 can be sucked and the system can rinse.

In the eventual next phase, on the 8th is shown and can take about 2 minutes, all the inputs and outputs of the circulation pump 43 closed. Subsequently, compressed air is passed through the same nozzles 39 injected into the chamber to drain and dry the plant. On to the outlet line 38 connected suction system can be provided, but is not shown.

After drying, the shells 33 and 37 away from each other like that 9 shows; the suction lance 52 as well as the drainage line 34 are returned to the container for coating liquid 36 submerged and the supply cycle is reopened. The device is ready for a new application.

The Total duration of such cleaning may be about 10 minutes and the required amount of cleaning fluid equals 20 liters, while the It takes three times as much time and twice as much detergent. Manual operations, often dangerous and are unhealthy, are no longer necessary for example to clean the sides of the cylinders.

It should be emphasized that this invention does not arise the above implementation forms limited and that many changes can be made without departing from the scope of the appended claims.

Claims (12)

Device for applying coating liquid to a metal sheet, comprising - a rotating support cylinder ( 1 ), to which a metal sheet ( 2 ) running; - supply means for supplying coating liquid; A rotating liquid film collecting cylinder ( 3 ), which is supplied by the supply means; and - possibly transfer means for transferring the liquid film from the collecting cylinder ( 3 ) on the around the support cylinder ( 1 ) running sheet metal ( 2 ), characterized in that it further comprises a flushing device comprising - a lower shell forming a recovery container ( 33 ) and an upper shell ( 34 ) which are mutually movable between a closed position in which they form a closed chamber containing the supply means, the collecting cylinder ( 3 ) and the transmission means, and an open position in which they are distant from each other; - a reservoir for cleaning fluid ( 53 ); A reservoir for coating liquid ( 36 ); - a compressed air source ( 47 ); - First circulating means, which are able to supply the supply means in the open position of the chamber coating liquid from the reservoir for coating liquid ( 36 ); Second circulation means, which are able to supply the supply means with the closed position of the chamber cleaning liquid from the reservoir for cleaning liquid ( 53 ); - spraying agent ( 39 ) which are capable of spraying cleaning fluid through at least one of the two shells to flush the elements enclosed by the chamber in the closed position; and - possibly introducing means for introducing pressurized gas ( 39 ) through at least one of the two shells to dry the elements enclosed by the chamber in the closed position. Apparatus according to claim 1, characterized in that the flushing device as a first and second circulation means a circulation pump ( 43 ) and a circuit which a supply line ( 30 ) for introducing either coating liquid or cleaning liquid into the supply means ( 4 ) and a discharge line ( 34 ) for discharging either coating liquid or cleaning liquid from the recovery tank ( 33 ). Device according to Claim 1 or 2, characterized that the spray for liquid at the same time as an introduction for Serve gas. Device according to Claim 3, characterized in that the spraying means serving simultaneously as an introduction means are provided with the above-mentioned circulating pump ( 43 ) are connected to circulate cleaning fluid, and with a compressed air source ( 47 ) are connected to introduce compressed air. Device according to one of claims 1 to 4, characterized that the Flushing device further eluent, comprises which are capable of a purge gas through the supply means. Device according to claim 5, characterized in that that the eluent, Supply the circulation pump and the circuit with the flushing gas. Device according to one of claims 1 to 6, characterized in that in the flushing device the lower shell ( 33 ) is arranged so that it is alternatively connected to the reservoir for coating liquid ( 36 ) and the reservoir for cleaning fluid ( 53 ) can be connected so that a return of the latter is made possible. Device according to one of Claims 1 to 7, characterized in that the supply means comprise a supply container ( 4 ) which contains the liquid and which in a lower part of the container ( 4 ) one along the collecting cylinder ( 3 ) extending liquid outlet ( 8th ) and that they have a flexible doctor blade ( 9 ) attached to the supply tank ( 4 ) is arranged so that it the outlet opening ( 8th ) down and against the collecting cylinder ( 3 ) is pressed to apply there the liquid film. Device according to one of claims 1 to 7, characterized that the Supply means include a color box into which the collector cylinder partially submerged. Device according to one of claims 1 to 9, characterized in that the collecting cylinder ( 3 ) has a peripheral surface which on the sheet ( 2 ) is applied to the support cylinder ( 1 ) running. Device according to one of Claims 1 to 9, characterized in that it comprises, as transfer means, at least one rotating cylinder ( 31 . 32 ) between the collecting cylinder ( 3 ) and the sheet metal ( 2 ) around the support cylinder ( 1 ) is included. Device according to claim 10 or 11, characterized that the Supplies an additional comprise rotating cylinder, which is against the collecting cylinder supported, wherein between them a gap is formed, in which the supplied coating liquid is recorded.