DE2236140A1 - SPRAY DEVICE - Google Patents

Description

Ψ Al FN TA N WAl TE

HELMUT SCHROETER KLAUS LEHMANN

D.PL.-PHYS. D.PL.-.NG. β MÖNCHEN 25 · LIPOWSKYSTR. IO

Crown Cork 4 Seal Company, Inc. cc-34

2o. July 1972 'L / Bi.

Spraying device

The invention relates to a spray device for spraying the inside of containers, such as cans or the like. Such a coating is required to the contents of the container, cans or the like. to protect from contamination and from spoilage. The invention relates in particular to a spray device with an elongated nozzle arrangement which extends into the space extends inside the container to be sprayed in order to achieve a coating on the inside that is as uniform and dense as possible to achieve the container. Different types of paints can be used, Enamels, glazes or other coating substances are used (hereinafter referred to as the spray medium).

Heretofore it has been difficult to get even and dense spray coatings on the inside of both the bottom and the side walls of Achieve containers if one did not use an elongated nozzle arrangement. Even if such nozzle arrangements are used the spray medium had a tendency to cool and solidify within the nozzle assembly when the The nozzle arrangement was not in use, so that the spray results were uncontrollable and non-uniform. Such Periods of non-use arise, for example, when the Supply of containers or cans due to operational malfunctions, Breaks in operation or other operational interruptions.

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About these difficulties when spraying after periods of non-use To eliminate, it is necessary to remove the paint or the other type of spray medium within the nozzle arrangement at all times to keep liquid or to maintain the desired viscosity.

Two types of spray devices have been used in the past. U.S. Patent 3,062,177 shows a device with Spray nozzles outside the container to be sprayed, it being difficult to obtain a satisfactory and uniform spray to achieve within the container. The second type of known spray device is in U.S. Patent 3,081 described, according to which elongated nozzle assemblies are used, which can spray within the container, in which In the past, however, it was not possible to keep the spray medium hot and sprayable at all times because it was not suitable Return system for the spray medium within the nozzle arrangement was present as created by the invention.

There were already return systems together with spray devices used, for example, as shown in U.S. Patent 3,529,626, However, this is not a return system that effectively within an elongated nozzle arrangement appropriate long and narrow training could be used. The spray devices are also according to that in this patent The type shown is not suitable to act as heating elements for adjacent conveying means for the spray medium in order to solidify or to prevent the build-up of residues of the spray medium.

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The invention is therefore intended to create a spray device which makes it possible to heat the spray medium inside the nozzle arrangement while the device is not spraying keep sprayable. '.

The invention provides a spray device for spraying The inside of containers, such as cans or the like., Created with an elongated nozzle arrangement for supplying the medium to be sprayed to the spray parts, with actuating devices for spraying the medium out of the nozzle arrangement and with a heating device for the inside of the nozzle arrangement located spray medium.

Through this heating device, the spray medium is within the Nozzle arrangement kept hot and ready to spray at all times.

In a further development of the invention, a constant circulation of the spray medium located in the nozzle arrangement is to be achieved in order to keep the medium to be sprayed at the optimal spray temperature. This is a further development of the invention achieved in that the heating device has a return device for the heated spray medium and that the Rückführeinrichtung.die line for supplying the spray medium surrounds to the spraying point.

Further advantageous developments and exemplary embodiments of the invention emerge from the claims.

Thus, a spray device with a distributor is created by the invention, which both the spray medium to the pump and the main heating device on the reservoir for the spray medium as well as the spray medium in a closed Can circulate circuit through the nozzle assembly. Rtick-

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Stands or solidifications of the spray medium, which can form in the long tubes of the nozzle arrangement, are thereby avoided that the spray medium is kept hot by other spray medium located in the circuit.

As a particularly preferred embodiment for the actuating devices Electrically operated solenoid valves are used to supply the spray medium to the spray points.

A particularly preferred embodiment of the spray device uses an elongated nozzle arrangement with two spray outlets. Two flexible tubes extend here through the nozzle arrangement to the two arranged in the nozzle tip Spray outlets. One of the spray outlets is used to spray the bottom surface on the inside of the container, while the other spray outlet is used to spray the side walls on the inside of the container. The flexible pipes are surrounded by a cylindrical part that forms an inner chamber through which hot spray medium is pumped around to keep the ready-to-spray medium in the spray tubes hot.

The outer wall of the nozzle assembly serves as a second concentric cylindrical part that has an outer chamber between the two forms cylindrical parts. The spray medium flowing towards the nozzle tip through the inner, concentric through the inner Partially formed chamber flows, exits through an outlet opening from the inner chamber and flows through the outer chamber, from which it exits at the end opposite the nozzle tip, where it flows through a manifold, which contains the solenoid valves. Part of the spray medium that is required for spraying is fed into the spray outlets leading spray pipes, while the rest of the spray medium

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is returned to the reservoir, where it is reheated and put back into circulation.

For the separate actuation of the two spray outlets for spraying the bottom and the side walls of the container can be provided independently controllable solenoid valves.

An embodiment of the invention is described below with reference to the drawing.

Fig. 1 shows schematically the spray device and the device for conveying the container with a can in the spray position.

Fig. 2 is a longitudinal section through the nozzle arrangement of the spray device.

Fig. 3 is a section through a solenoid valve along the line 3-3 in Figure 2, and

Fig. 4 is a section through the nozzle block along the line 4-4 in Figure 2.

According to Figure 1, a distributor Io has electrically operated Solenoid valves 11 and 13, which represent the actuating means for the spray device within the overall arrangement. Pipe sections 12 connect the distributor Io to another Part of a valve housing 14 and form a double connection for a fluid medium from the manifold Io to the mentioned part of the valve housing 14. The valve housing 14 is adjacent to a nozzle block 16, of which a nozzle extension 18 extends away which terminates in a nozzle tip 2o. As shown in Figure 1, extends

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the nozzle assembly l8 into a can 22 into which Rails 24 is conveyed along. The can is set by wheels 26 and 27 in rapid rotation, so that a uniform Coating can be sprayed onto the inner walls of the can. Instead of the one just described and illustrated Can transporter, any suitable other can transporter can be used and the assembly can can be used for all types of cans.

As will be described in detail later, paint is applied from a final spray outlet 44 onto the bottom surface 2j5 of can 22 and sprayed onto the inner side surfaces of the can 22 from a side spray outlet 46.

The nozzle arrangement can be arranged either reciprocating or stationary, since the spraying depends on the type of used Transport system for the cans can be carried out.

As shown in Figure 2, flexible tubes 28 and 28, which carry the spray medium for the final spray outlet and the side spray outlet, extend through the nozzle extension 18. The tail pipe is in communication with the final spray outlet 44 in the nozzle tip 2o, and the side pipe Jo is in communication with the side spray outlet 46 on the side of the nozzle tip 2o. The tubes 28 and JJo extend through the DUsenblock 16 and are in connection with paint lines 38 and 36, which lead to the solenoid valves 11 and 13 in the manifold Io.

As FIG. 3 shows, the paint line 38, which is connected to the end pipe 28, leads to the one solenoid valve 11 in the distributor Io. A spring-loaded valve lifter 34 or other similar actuating means is provided to the

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Complete paint line'38 so long, Ms the solenoid valve is operated. The paint line 36 leads to an identical solenoid valve I3 with a valve tappet, not shown, the solenoid valve 13 in the manifold Io near the Solenoid valve 11 is arranged.

As Figure 2 shows, an inner cylindrical member 48 is concentric within the outer wall 50 of the nozzle extension 18 and forms a channel or chamber 52 within of part 48 and a channel or chamber 54 between the part 48 and the outer wall 5o of the nozzle extension The inner part 48 can be fastened and held in place by a weld seam 55. A weld 57 is used to Attachment of the outer wall 50 to the nozzle tip 2o. the Tubes 28 and 30 are within the inner concentric portion 48 arranged.

As FIGS. 1 and 4 show, a paint supply line opens into an opening 58 of the nozzle block 16 and is connected to the inner one Chamber 52 in communication so that paint is within the nozzle extension l8 in the space surrounding the pipes 28 and j5o to the Nozzle tip 2o can flow towards. The paint flowing in this way reaches an outlet opening 53v where it enters the outer one Chamber 54 between the. inner concentric part 48 and the outer wall 5o crosses. The paint flows this way through the chamber 54 back to the nozzle block 16. With the chamber 54 is connected to an opening 60 in the nozzle block l6, which opens into a paint discharge line 62 leading from the nozzle block leads away.

According to FIG. 3, the paint discharge line 62 is connected to the paint line 38 in connection when the valve stem 34 is in its actuated position (after the solenoid valve has responded).

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A line 7o is also connected to the paint discharge line 62 and leads to a transverse line 72 which extends through extends the manifold Io as shown in Figure 2 and which leads to a line 74. The line 74 opens into one Paint return line 64 in the same symmetrical manner as the line 7o opens into the paint discharge line 62. The paint return line 64 is in connection with the paint line 36 when the one not shown belongs to the solenoid valve I ^ The plunger is in its open position. This arrangement is identical to that in relation to the solenoid valve 11, the plunger 34, the paint discharge line 62 and the paint line 38 shown and explained arrangement. The paint return line leads to a paint store (Figure 1), the heating and pumping equipment having. Here the returned paint is heated up again and then pumped back through the system, whereby it enters the nozzle system through the paint supply line 56.

In this way there is normally hot paint from the supply through paint supply line 56 to the nozzle assembly pumped. The paint is applied with high pressure, for example with about

50 to 60 kg / cm, pumped through the system. The hot paint gets on through the opening 58 into the inner chamber 52, where it flows around the tubes 28 and 30 and heats them up while it flows upward in the nozzle extension to the opening 53, where it enters the chamber 54 and through the nozzle extension flows back to the outlet opening 60, which is connected to the paint discharge line 62 is in communication. The paint passes through the paint discharge line 62 to the distributor where it enters the solenoid valve 11 enters and either, when the valve is actuated, passes through the valve into the paint line 38, or from where he, when the valve 11 is not actuated, through the line into the cross line 72 and from there into the line 74 and to

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the opposite solenoid valve IJ flows. Here flows the paint either into line 36 when valve I3 is actuated is, or it flows through the paint return line 64 back to the paint supply / where it is heated up again and again 'is circulated *

If one or both of the solenoid valves 11 and 13 are actuated, the paint flows into the paint lines 36 and 38, which lead to the Pipes 30 and 28 lead, in turn, the paint to the Seitensprühauslaß 46 for spraying the lateral inner surfaces of a

Can or to the final spray outlet 44 for spraying the floor area lead a can. The facilities for supplying the paint to the final spray outlet 44 and to the side spray outlet 46 kept completely separate because each of the solenoid valves 11 and 13 can be operated independently of the other, to the spray effect in the separate spray devices independently control from each other.

It turns out that in this way hot paint constantly flows through the channels or chambers 52 and 54 and serves there to heat the paint already in the tubes 28 and 3o, where the paint is before it is sprayed. The consequence of this is that even if the paint in the pipes 28 and Jo is not used for a certain period of time, it is still kept hot and sprayable.

As can be seen from Figure 3, the solenoid valves 11 and I3 pressed to spray paint into the cans. Springs (not shown) guide the valves 11 and 13 or their valve tappets 34 back to the closed position. This eliminates the difficulties which have historically been found with air actuated pistons used to deliver paint to the nozzle extension and were used to the nozzle tip;

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Claims (12)

-Ιο- cc-34 2236U0 PATENT CLAIMS Spray device for spraying the inside of containers, cans (22) or the like. with an elongated nozzle arrangement (L8) for supplying the medium to be sprayed to the spray point (23, 25), with actuating devices (11, I3) for Spraying the medium from the nozzle arrangement and with a Heating device (48, 52) for the spray medium located within the nozzle arrangement. 2. Spray device according to claim 1, characterized in that the heating device has a return device (48, 52, 53, 54, 50) for the heated spray medium and that the return device surrounds the line (28, 3o) for supplying the spray medium to the spray point. 3. Spray device according to claim 1, characterized in that the nozzle arrangement (l8) is separate Lines (28, 30) for this at different points having spraying medium. 4. Spray device according to claim 3 »characterized in that for each of the separate lines (28, 30) a separate actuating device (11, 13) is provided. 209886/0898 -11- cc-34 . . 2236H0 5. Spray device according to claim 1, characterized in that the nozzle arrangement (l8) has a nozzle tip (2o) with separate devices (44, 4,6) for Has spraying of the spray medium on different spray points (23, 25). 6. Spray device according to claim 1, characterized in that g e k e.n η, that the actuating devices have separately controllable electrical solenoid valves (11, 13). 7. Spray device according to at least one of the preceding claims, characterized in that the Nozzle arrangement (18) has an outer cylindrical wall (50) and an inner cylindrical wall arranged concentrically therewith Part (48) for forming a first elongated chamber (52) within this part (48) and for forming a second elongated chamber (54) between the inner part (48) and the outer wall (50) that the first chamber (52) -with a feed device (l6, 56, 58) is in connection that the nozzle tip (2o) at the end of the Nozzle arrangement (18) is provided that the inner cylindrical part (48) has an opening (53) in the vicinity of the nozzle tip for connection between the first chamber (52) and the second chamber (54) that extends through the nozzle arrangement (18) within the first chamber (52) at least one tube (28, 30) extends to the nozzle tip (2o), that this tube (28, 3o) with an actuating device (11, 13) is in communication that a connecting line (60, 62) for the spray medium between the second chamber (54) and the Tube (28, 3o) is provided, and that means for Return, reheat and recirculate of the spray medium are provided so. that when 209888/0898 -12-, cc-54 drove the device spray medium through the first chamber (52) and the second chamber (5 ^) and through the connecting line (6o, 62) is passed, from where the medium either through the actuating device (11, 13) into the pipe (28, 3o) to Spraying arrives or is returned. 8. Spray device according to claim 7, characterized in that within the first chamber (52) two to the nozzle tip (2o) extending tubes (28, jk>) are provided and that separate actuating devices (11, 13) on which the Nozzle tip facing away from the end are provided for the supply of spray medium. 9. Spray device according to at least one of the preceding claims, characterized in that feed devices are provided for the spray medium, which has a storage container for this medium and one with this connected pump and supply lines (56) for conveying the spray medium to the first chamber (52). 10. Spray device according to claim S, characterized in that the spray medium with a pressure of ο
about 5o to 6o kg / cm is pumped through the device. 11. Spray device according to claim 9, characterized in that a heating device is additionally provided for the spray medium in the region of the storage container. 12. Spray device according to at least one of the preceding claims, characterized in that the independently controllable actuating devices 209886 / 0P98 -13- cc-34 (11, 13) are housed in a distributor (lo), the a cross line (72) for the spray medium for connection of the two actuating devices (11, 13). 13 · Spray device according to at least one of the preceding claims, characterized in that the Means for recirculating essentially absorbs all of the circulating spray medium, with the exception of that part of this medium which is caused by the separately or simultaneously actuated actuating devices (11, 13) to the spray devices (44, 46) at the nozzle tip (2o) got * 209886/0898