NL1018097C2 - Powder coating cabin has nozzles opposing each other on either side of object passed through cabin housing - Google Patents

Abstract

The cabin comprises a housing (2) with an entrance opening (3) and an exit opening (4) defining a path for the object (6) to be passed along. Spray nozzles (5) are mounted opposite each other on either side of this path. Suction devices are provided close to the entrance and exit openings.

Description

POWDER COAT Booth

The invention relates to a device for applying a powdered material to an object.

Such devices, which are also referred to as powder coating booths, consist of a housing through which objects are passed, which must be provided with the layer of powdered material. Spraying means are provided on both sides in the housing, which apply the powdered material to the object. Furthermore, high-voltage means are arranged in these spraying means, which ensure that the powdered material adheres to the object. In the known powder coating booths, a number of nozzles are arranged one above the other and, on the other hand, a suction is provided on the other side of the cabin, which extracts excess powder material. Viewed in the transport direction, a second row of nozzles are arranged offset from the first nozzles arranged one above the other, which again comprise suction means on the opposite side.

With the aforementioned powder coating booths a reasonable layer thickness of the powdered material is obtained on the object, but with objects with a complicated shape it remains necessary to manually check the layer thickness afterwards and an additional layer of powdered material may have to be applied locally manually .

It is an object of the invention to provide a powder coating booth in which a better result is obtained and the need for manual updating is reduced.

This object is achieved with a device according to the invention, which comprises: a housing with an inlet opening and an outlet opening, between which a transit path extends for passing the object through the arrangement along the transit path; - on either side of the transit path, spraying means arranged substantially opposite each other for spraying the powdered material onto the object; suction means arranged near the inlet opening and the outlet opening 10.

Because the spraying means are arranged on both sides and opposite each other, the clouds of powdered material emitted by the spraying means will collide against each other in the middle of the housing and thus form a cloud of powdered material in which little flow is present. The object is guided through this cloud through the input opening and it appears that this results in better quality. Powdered material, which threatens to exit the housing via the inlet opening or outlet, is suctioned off by the suction means arranged there and can possibly be reused.

According to an embodiment of the device according to the invention, air supply means are arranged next to the spraying means. Since the extraction means are arranged near the inlet opening and the outlet opening, it may be that only air is extracted from outside the device. By arranging air supply means next to the spraying means, a light flow can hereby be created in the device, whereby the powdered material is suctioned off at the inlet opening and outlet opening.

In a preferred embodiment of the device according to the invention, it is plane-symmetrical with respect to a plane in which the transit path lies. As a result, a cloud of powdered material that is as quiet as possible is formed around the transit track.

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The inner walls of the housing are preferably made of plastic. Plastic has the advantage that it charges itself electrically as the particles of the powdered material and thereby contribute to the potential difference between the grounded object and the particles charged with high voltage.

In another preferred embodiment according to the invention, the inner walls which extend between the inlet opening and the outlet opening are concave. This contributes to the formation of a cloud of powdered material.

In addition, the inner walls can be substantially parabolic.

In yet another embodiment of the device according to the invention, the spraying means comprise a number of nozzles, which are alternately directed horizontally and obliquely upwards. The particles of powdered material will fall due to gravity. As a result, upper surfaces of an object will more easily be provided with a layer of powdered material than lower surfaces. By now tilting a number of nozzles upwards, this effect is reduced or even eliminated.

In addition, the spraying means can be movable up and down. To ensure that a cloud of powdered material is formed in which little flow is present, the spraying means are preferably movable synchronously. That is, opposite nozzles are moved up and down simultaneously.

These and other features are further elucidated with reference to the accompanying drawings.

Figure 1 shows a powder coating booth according to the invention in perspective view; Figure 2 shows a schematic top view of the powder coating booth according to Figure 1.

Figure 1 shows the device 1 which has a housing 2 with an inlet opening 3 and an outlet opening 4. The nozzles 5 are furthermore arranged in the housing, which nozzles are alternately directed horizontally and obliquely upwards. These nozzles can be moved up and down.

Objects 6 can be introduced into the device via the inlet opening 3. Gaps 7 are provided near the inlet opening 3 and outlet outlet 4, along which air can be extracted. This air is discharged at the rear via discharge tubes 8.

Figure 2 shows a top view of the device according to Figure 1. The powdered material P is sprayed against the object 6 by means of the nozzles 5. Since the clouds of powdered material are sprayed from both sides to the object 6, a balance is created between these clouds in the middle of the housing 2, so that little current is present in the middle. As a result, the particles of the powdered material can easily adhere to the object 6. Due to the accumulation of powdered material, this will be moved to both the inlet opening 3 and the outlet opening 4. Gaps 7 are provided here along which air L is extracted and thus also excess powder. The size of the slits 7 can be adjusted by turning the wall parts 9.

As can clearly be seen, the wall parts 9 together with the walls in which the nozzles 5 are arranged form concave walls. Due to a further design, they can even be parabolic shaped when viewed from above.

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Claims (9)

Device for applying a powdered material to an object, which device comprises: - a housing with an inlet opening and an outlet opening, between which a passage path extends for passing the object through the device along the passage path; - spraying means arranged substantially opposite to each other on either side of the transit path for spraying the powdered material onto the object; - suction means arranged near the inlet opening and the outlet opening. 2. Device as claimed in claim 1, wherein air supply means are arranged next to the spraying means. Device as claimed in claim 1 or 2, wherein the device is plane-symmetrical with respect to a plane in which the transit path lies. Device as claimed in any of the foregoing claims, wherein the inner walls of the housing are made of plastic 5. Device as claimed in any of the foregoing claims, wherein the inner walls that extend between the inlet opening and outlet opening are concave The device of claim 5, wherein the inner walls are substantially parabolic. 7. Device as claimed in any of the foregoing claims, wherein the spraying means comprise a number of spray nozzles, which are alternately directed horizontally and obliquely upwards. 1 0 1 8 0 9 7 Device as claimed in any of the foregoing A claims, wherein the spraying means are movable up and down. 9. Device as claimed in claim 8, wherein the spraying means are movable synchronously. 1018087