ES2287626T3 - COATING POWDER COVERING POWDER. - Google Patents

Abstract

The booth has powder flopping columns (28,30,32) provided in the cabin walls (22,24). Flaps (2) are arranged between a cabin base (6) and a spraying area (8), in a longitudinal direction. The flaps are larger in the partial open position and are smaller in the complete open position. The powder particles fall downward from the powder flopping column, by the force of gravity, in the partial open position.

Description

Spray coating booth in powder.

The invention relates to a cabin of powder spray coating according to the preamble of the claim 1.

From EP 1 162 002 a known powder spray coating booth in the form of column, circular seen in a horizontal cross section, which in two sides diametrically opposite each other presents in each case a wall opening for objects for transporting objects that they will be covered through the coating booth by powder spraying A cabin floor is composed of a left side floor area seen in the transport direction of the object and a right side floor area, a channel of extraction that joins the two ground areas together in one direction transverse of the cabin, which extends parallel to to the direction of transport of the object between the two openings for objects and that is covered by a roof-shaped roof of two waters. The roof in the form of a gable roof is composed of two doors, which in each case can rotate so manual or motor around an axis of rotation that extends into the longitudinal direction of the doors between a closed position in the roof stand line and an open position in the line of roof stand. The doors have from the cabin floor in all positions a small separation, through which excessive dust may fall. The left and right floor areas they are only inclined slightly in the direction towards the channel of extraction, so that excessive dust that falls on them cannot slip by the force of gravity, but so that dust slipping to the extraction channel is additionally required compressed air. The extraction channel formed in the soil of cabin extends from the deepest points of the areas of floor side down. This gives a total height of  the powder spray coating booth, which stops some clients are too high, since they don't have spaces high enough in the building and creating a moat in the floor of the building to place the covering cabin by powder spraying is either not possible or it is too much face. For the same reason the ground areas that limit laterally with the extraction channel they cannot be configured either with an upper slope so that the powder coating slide by the force of gravity, because then the cabin of powder spray coating would reach a total height even superior A high cabin substructure, which forms the ground of cabin and the extraction channel, also has the drawback that the bottom edge of the wall openings for objects is located at a relatively high height and therefore also the objects to be covered must be transported at a height correspondingly raised through the coating booth by powder spraying and through the building space, in which is used spray spray booth in powder. The design of the cabin floor cannot be modified so arbitrary, because to achieve a good quality coating and good performance (little dust loss) in the area of spray coating spray booth in dust should not produce unfavorable drafts. He powder coating is pneumatically transported with air compressed, so that with the spray powder to the cabin of powder spray coating also arrives air compressed. However, compressed air must not be removed by The coating powder of the object to be coated is blown. He coating powder only adheres slightly to the object, a Permanent adhesion is only achieved after the process of coating in a drying oven, in which the powder of coating on the object. However, in the cabin of Powder spray coating should also not occur no excessive pressure, since only dust particles they would come out through different holes in the cabin outside. In addition with some powders there is a risk that in case of a high dust concentration inflammation may occur spontaneous and with it an explosion. For this reason through mentioned extraction channel is constantly extracted during the coating operation by spraying air and excessive dust, that is sprayed without hitting the object to be coated or bounces on the object. To clean the internal space of the cabin  powder spray coating, which is necessary in each change from one type of powder to another type of powder, it is usual, apply compressed air on all internal surfaces of the cabin, and extract compressed air along with excessive dust blown through the same path as during spray coating process through the channel extraction. Excessive dust extracted during the operation of Spray coating is usually separated from the flow of air, for example by a cyclone, and reused. TO Often the dust extracted during a cleaning process can no longer be used.

The spray devices for the spray coating of a plurality of objects with the same type of dust are automatically controlled devices, usually called automatic guns, which carries by example a lifting stand or a robot and that according to the case of application can also move with respect to the object that is going to cover up For precoating or subsequent coating or to cover individual objects it is also usual to use spray devices that are held by hand, manually operated, which are also usually called hand guns or manual spray guns.

Through the invention the objective will be solved to configure the powder spray booth in such a way that with respect to the state of the art the vertical separation between the bottom edge of the cabin and the edge The lower of the objects to be covered is smaller. In others words, the height of the cab substructure, which comprises the cabin floor and its air extraction device are will design smaller. The height of the cab substructure is will reduce in such a way that when placing the covering cabin by powder spraying in normal buildings no longer required A moat on the floor of the building. This objective will be solved by such that the extraction of air and dust particles from the powder spray coating booth during spray coating operation will not influence a high quality coating of objects and optimal performance of the application of dust (little excessive dust).

This objective is met according to the invention. by claim 1. According to this the invention is resolved by a powder spray coating booth, which it comprises at least two doors, which are arranged between a floor of cabin and a zone of pulverization located on the same and that are arranged so that they can rotate relative to each other in each case around a longitudinal door direction, characterized in that the doors are arranged so that can rotate around its longitudinal direction between a partially open position and a fully open position, forming the doors both in the partially open position and also in the fully open position between them and between the laterally outermost doors and the cabin walls adjacent to them in each case a dust passage gap that extends in the longitudinal direction of the doors, which in the partially open position is smaller than in the position completely open, although in the partially open position it is still at least large enough for particles to dust falling down from the spray zone through the force of gravity can fall through the interstitium of passage of dust

The advantages of the invention are especially:

A very small height of the substructure of the cabin and with it also the total height and with it also a smaller separation from the lower edge of the cabin to the edge bottom of the objects to be coated. Usually with This is no longer necessary, for the client in the warehouse of manufacturing, in which the covering cabin is to be located by powder spraying, a pit to sink the substructure of the cabin. The invention also has the advantage that it is achieved a homogeneous extraction of air from the spray zone, especially from the spray zone of automatic guns. This also achieves an application performance of Very good powder (little excessive dust) and a good coating quality.

The dependent claims contain additional features of the invention.

The invention will now be described with reference to the drawings by a preferred embodiment  as an example. The drawings show

Figure 1 schematically a section vertical transverse through a coating booth by elongated powder spraying according to the invention,

Figure 2 schematically a section longitudinally through a coating booth by powder spraying according to the invention, which presents the features of figure 1 and additional features.

The spray coating booth in powder depicted in figure 1 in a cross section horizontal according to the invention can be a cabin in the form of column, for example circular or square or rectangular or polygonal, seen in a horizontal cross section. It is preferably a booth for automatic spray coating of objects with powder coating, in which case the cabin is provided with two sides opposite each other in each case of an opening for objects and in at least one cabin wall that runs transversely to it one or more grooves are formed, preferably vertical, to introduce one or more guns automatic in the cabin. According to another embodiment the cabin Powder spray coating can be however also a booth for manual coating of objects, in whose case is open on at least one side or has a large hole, of so that a person with a hand gun manually holds you can cover objects in the cabin and in this regard you can observe through the open side of the cabin the object that is going to cover up According to another embodiment plus the cabin of powder spray coating can be a combination in which objects can be coated with both automatic guns as well as by hand guns. Then with the term longitudinal direction of the cabin shall be designated in each case the direction in which the objects that can be transported they will be covered from one opening to objects to the other opening for objects through the cabin, this direction being longitudinal transverse to the direction, in which you can spray powder spray on the object to be be coated by automatic guns or hand guns.

The powder spray coating booth shown in Figure 1 comprises at least two doors 2, three in the preferred embodiment shown, which are disposed between the surface 4 of a cabin floor 6 and a coating spray zone 8 of objects located on the cabin floor. Spray zone 8 is the area where objects 10 can be coated by means of one or more automatic guns 12 with coating powder 14, which is pneumatically transported. The spray zone 8 therefore extends over the entire width of the cabin and in the longitudinal direction of the cabin between two openings 16 or 18 for objects arranged opposite to each other as much as coating powder 14 can spray the automatic guns 12 and as excessive powder ( over-spray powder ) it can fall on the floor 6 of the cabin. The arrangement of two or more doors 2 preferably extends by at least 50%, preferably at least 75% to 100% of the internal cross-section of the cabin in the spray zone 8. The doors 2 are arranged preferably distributed throughout the cabin floor 6, at least as much as the spray zone 8 extends.

Under the doors 2 a channel 20 of extraction, which at the top is delimited by doors 2, at the bottom, on the floor 6 of the cabin and laterally by inclined wall portions 22 or 24 of a Cab substructure 23.

Wall parts 22 and 24 of channel 20 of extraction have with respect to a horizontal an inclination of at least 45 ° or more and preferably they are vertical, so that the excessive dust that falls on them can slide down the force of gravity to the floor 6 of the cabin. Parts 22 and 24 Walls preferably have a smooth surface. High slope of wall parts 22 and 24, which are extensions bottom of the cabin wall surfaces in zone 8 of spraying, allows to distribute the doors 2 for almost all the cross section of the cabin.

At least one hole 26 of extraction in a wall part 25 of the extraction channel 20 in a point located deeper than door 2 to extract air and excessive dust from extraction channel 20. Hole 26 of extraction is preferably formed in a wall part 25, extending transversely to the longitudinal direction of the doors 2, as shown in figure 2.

The doors 2 are arranged so that can rotate around its longitudinal direction between a partially open position, shown in figures 1 and 2 with drawn lines, and a completely open position, which stops Door 2 shown on the left in Figure 1 is shown with 2-2 lines of dots and stripes. The turn of the doors 2 can occur around an axis 36 of rotation which runs in the longitudinal direction of the doors or, according to another embodiment, around a turning line in shape of Arc.

The longitudinal direction of doors of the doors 2 is preferably parallel to the longitudinal direction from the cabin and also to the transport direction of the objects 10. This is the preferred embodiment of the invention shown in the figures. According to another embodiment of the invention the longitudinal direction of the doors 2 also It can be transverse to the longitudinal direction of the cabin.

Doors 2 form between them and between wall parts 22 or 24, which oppose the doors 2 laterally laterally external, in each case an interstitium 28 and 30, or 32 of dust step The interstices 28, 30 and 32 of dust passage have in the partially open position, shown in figure 1 with drawn lines, reduced width, and in position fully open, shown in figure 1 with lines 2-2 of dots and stripes with respect to door 2 shown on the left, a large width. The interstices 28, 30 and 32 dust passage are present in each rotating position of the 2 doors and extend over the entire door length, without However, its gap width depends on the turning position of Doors 2. Doors 2 may be configured for formation of interstices 28, 30 and 32 of conical dust passage or steadily wide in the longitudinal direction.

During the coating operation by spray doors 2 preferably have the position of turn shown in figure 1, in which the interstices 28, 30 and 32 Dust passage are as small as possible. With this you get during the spray coating operation a reduced, quiet, homogeneous current in zone 8 of spraying, although a rapid air flow around the doors 2, so that this fast air stream drags dust particles from doors 2 and parts 22 and 24 of wall adjacent laterally to them towards the inside of channel 26 extraction and towards the extraction hole 26.

The doors 2 have a width A, which is a multiple greater than their thickness B. Preferably the doors 2 are configured correspondingly to figure 1 with two leaves, with in each case two identical leaf halves on both sides of its axis 36 of turn. The leaf halves run, starting from the axis 36 of rotation, towards its lateral ends as a wedge, becoming thinner. In this way, more favorable cab current relations and a lower possibility of adhesion of the dust particles to the doors 2 are obtained. The doors 2 are in the partially open position, shown in Figure 1, in a position turning, in which they align with each other in the direction of their door width. The doors 2 are in the fully open position preferably in a turning position, in which their door width is oriented vertically, corresponding to the lines 2-2 of stripes and points of the left door 2 of Figure 1. These they are the maximum positions for the partially open position and the fully open position. However, it can be seen that the partially open position and / or the fully open position can also be formed by intermediate positions between the positions shown. Additionally, a height-shifted arrangement of the doors 2 is also possible. In all embodiments, the gap width of the gap 28, 30 and 32 in the partially open position is smaller than in the fully open position. However, it is important that the dust passage interstices 28, 30 and 32 are also open in the partially open position of the doors 2, preferably at least one centimeter, so that also during the spray coating operation particles of dust through the
same.

Doors 2 meet during operation Spray coating normally in position partially open However, it is also possible to turn during spray coating operation all or preferably only one or a few doors 2 successively to the fully open position and then back again to partially open position, to allow dust excessive deposited on them slide by force of the gravity inside the extraction channel 26. The turn of only one or a few doors 2 in succession, instead of all doors 2 simultaneously, has the advantage that in zone 8 of spraying does not produce any air current that harms the quality of the coating and the performance of the coating. During the cleaning of the internal space of the cabin, for example by blowing with compressed air, all doors 2 are preferably in the fully open position.

The turn of the doors 2 can be done manually using a crank, which can be coupled with a end of doors 2, or by means of a motor drive, for example an electric, pneumatic or hydraulic drive 40, which is represented in figure 2 schematically and that is attached with one end on the front side of the doors 2 with regarding the drive. According to the embodiment of the invention the drive 40 may be configured for the individual actuation of a door 2 in each case or for the common operation of 2 individual doors or all doors.

The figures show a superstructure 42 of cabin on substructure 23. In superstructure 42 are formed on opposite sides of the cabin in each case one of the two openings 16 and 18 for objects for the displacement of objects 10 to be covered through the cabin of powder spray coating by means of a transport device 44, which is schematically represented in Figure 1

The cross section visible from above each door 2 is in the partially open position (lines traces of figure 1) smaller than in the fully position open (lines 2-2 of stripes and points of the figure one). The width A of the doors 2 is preferably between 100 mm and 800 mm, for example between 260 mm and 660 mm, even more preferably between 360 mm and 560 mm, for example in approximately 460 mm The greatest thickness B of each door 2 is preferably located on its axis 36 of rotation and preferably so reduced as possible with respect to stability. The thickness B is it is for example between 10 mm and 100 mm.

The interstitium 32 of passage of dust between the doors 2 have a width C of partially open position for example 50 mm. It can also be higher or lower, for example of at least 10 mm, and is preferably in the range of between 10 mm and 100 mm, preferably in the range of 20 mm and 80 mm, or even more preferably between 40 mm and 60 mm, for example in the mentioned 50 mm. The gap width of the interstices 28 and 30 of dust passage between the external doors 2 laterally and adjacent wall portions 22 and 24 have preferably a similar range of magnitudes in the position partially open doors 2. Within the range of mentioned quantities may be less than the passage 32 of dust between the doors 2 in the partially open position, according to another embodiment but also greater than this.

The clearing of the gap 28, 30 and 32 of passage of dust between doors 2, and between doors 2 and parts 22 or 24 adjacent wall, in the fully open position depends of the thickness B of the doors and the radial separation of the axes 36 of turning the doors 2 together. According to the mentioned measures for the width A and the thickness B of the doors 2 the clearing of the interstices 28, 30 and 32 of dust passage is found when all doors are in the fully open position (lines 2-2 stripes and dots in figure 1), preferably in the range of 100 mm to 800 mm, even more preferably between 260 mm and 660 mm, preferably in the range between 360 mm and 560 mm, for example in approximately 460 mm

The separation D of the doors 2 of the surface 4 of cabin floor 6 in fully position open, when placed according to the lines 2-2 stripes and dots in Figure 1 vertically, it must be on the one hand very small, on the other hand not so small, so that the doors 2 can rise above the ground 6 of cabin or can catch between them and the cabin floor dust particles This is why this separation D is found preferably between 10 mm and 50 mm. In case on the ground 6 cabin excessive dust is deposited, it can also select a greater separation.

The height dimension of the objects 10 that go to be covered can be at most as large as the height E inside of openings 16 and 18 for objects. The lower edge 44 of objects 10 can reach the edge 46 bottom of openings 16 and 18 for objects. By means of the configuration according to the invention of substructure 23 with the doors 2 can reduce the height F between the bottom 48, on the that the spray booth can be placed in dust, and the lower edge 44 of the objects to be coated or from the bottom edge 46 of openings 16 and 18 for objects up to a very small measure, for example up to only 700 mm. The superstructure 42 can be placed at a very low height G of for example only 600 mm on the substructure 23. The height interior between the surface 4 of the floor of the cabin floor 6 and the doors 2 oriented horizontally in the fully position open depends on the width A and the thickness B of the doors 2.

The openings 16 and 18 for objects are formed in 50 or 52 cabin walls opposite each other. If of round cabins, these are wall sections, in the case of Elongated or square cabins are front cabin walls. In at least one of two cab side walls 54 and 56 that run transversely to cabin walls 50 and 52 is formed at least one, as example three, slot slot 60 gun to insert an automatic gun 12 from outside of the powder spray booth in the area 8 spray, whose groove width approximates in each case to an automatic gun

The automatic gun 12 is carried by a device 62 sustainer, for example a lifting stand or a robot. The gun slot holes 60 extend over a height, which allow a coating of objects 10 for their entire height of object, and with it at a height corresponding to the height E of the openings for objects.

The doors 2 can extend inside the cabin from the opening 16 for objects to the other opening 18 for objects. Coating Zone 8
to and with it also the area, through which the doors 2 extend in a horizontal direction in the longitudinal direction of the cabin and in a transverse direction of the cabin, may be limited to a partial length of the cabin, when another part of the cabin serves another purpose, for example for an additional spray zone 8 for spray coating with automatic guns 12 or according to Figure 2 for spray coating with a hand gun 72. For example, a longitudinal section 74 of the cabin may be configured as a manual coating space 70 with a hand gun spray zone 78. In this case at least one of the two side walls 54 and / or 56 of the cabin has a manual covering hole 80, through which a person can direct the hand gun 72 to an object 10 that is to be covered and this In this regard, the spray jet and the object 10 to be coated can be observed simultaneously. The manual coating space 70 has a cabin floor 82 with a floor surface 84 under the hand gun spray zone 78. This surface 84
The floor is preferably at least the same height as or higher than the upper edge of the doors 2 in the partially open position and in the fully open position, so that excessive dust deposited on this floor surface 84 by force of gravity can be blown by means of the compressed air of a flexible tube for compressed air or another source of compressed air in the direction towards the cabin area, which presents the doors 2, so that excessive dust can then fall through the interstices 28, 30, 32 to the extraction channel 20 of the automatic gun spray zone 8 by the force of the
gravity.

The use of an intermediate floor as floor 82 of space-covered cabin 70, which is more high than the cabin floor 6 of the spray zone 8 of automatic gun, has the advantage that under the ground intermediate is created a storage space 86, in which you can put the drive 40 for the doors 2.

The cabin floor 6 of the automatic spray gun zone 8 forms itself the extraction channel 20, without requiring an additional gap in the cabin floor 6. The extraction hole 26 preferably extends over the entire width of the cabin floor 6, which is essentially flat. The height I of the extraction hole 26 for example rectangular can extend from the surface 4 of the cabin floor 6 to almost the lower edge of the doors 2, when the doors 2 are in a horizontal position, as shown in Figure 1. Without However, the height I can also be smaller, in order to generate an acceleration of the air, which helps to avoid dust deposits in the extraction channel 20. To the extraction hole 26 a transition channel 88 is connected to a round extraction duct 90 in a cross section
Salt.

According to an embodiment not shown of the invention the manual coating space 70 is not found inside but outside the coating booth by powder spraying adjacent to one of the openings 16 or 18 for objects; or in each case a manual coating space 70 of this type at each end of the spray zone 8 of automatic gun either inside or outside the cockpit of powder spray coating.

Claims (12)

1. Powder spray coating booth comprising at least two doors (2), which are arranged between a cabin floor (6) and a spray zone (8) located thereon, and which are arranged so that they can rotate (36) relative to each other in each case around a longitudinal door direction, characterized in that the doors (2) are arranged so that they can rotate (36) around their longitudinal direction between a partially open position and a position completely open, forming the doors (2) both in the partially open position and also in the fully open position between them and between the laterally more external doors (2) and the cabin walls (22, 24) adjacent to them in each case an interstitium (28, 30, 32) of dust passage extending in the longitudinal direction of the doors, which in the partially open position is smaller than in the fully open position erta, although in the partially open position it is still at least large enough so that dust particles falling down from the spray zone (8) by the force of gravity can fall through the interstitium (28, 30, 32) Dust passage. 2. Powder spray coating booth according to claim 1, characterized in that the side walls (22, 24) of the cabin, extending from the floor (6) upward to the side of the side of the doors (2) more external, they have an inclination of at least 45 ° or more, so that the coating powder can slide from them by the force of gravity. 3. Powder spray coating booth according to claim 1 or 2, characterized in that the cross-section visible from above the doors (2) is larger in the partially open position than in the fully open position. 4. Powder spray coating booth according to at least one of the preceding claims, characterized in that the surface (4) of the cabin floor (6) and the surface of the cabin walls (22, 24), extending from the cabin floor up to the side of the external doors (2), are configured in an uninterrupted and smooth way, so that the dust particles can easily slide on them. 5. Powder spray coating booth according to at least one of the preceding claims, characterized in that the longitudinal direction of the doors (2) extends in the direction of the rectilinear separation of openings (16, 18) for objects, which are formed opposite each other on walls (50, 52) of the powder spray coating booth to automatically move the objects (10) to be coated through the powder spray coating booth. 6. Powder spray coating booth according to at least one of the preceding claims, characterized in that an extraction orifice (26) for extracting air and dust particles is formed in a lower part of the car adjacent to the car floor (6) , and has a cross section, which is adapted to the surface (4) of the cabin floor (6) and that extends transversely to the axis (36) of rotation of the doors (2) in both transverse directions up to axes (36) of outermost rotation of the doors (2). 7. Powder spray coating booth according to at least one of the preceding claims, characterized in that the doors (2) are arranged so that they can rotate independently of each other, individually, around their longitudinal direction. 8. Powder spray coating booth according to at least one of the preceding claims, characterized in that the doors (2) are provided with a drive device (40), by means of which they can rotate in each case together around their axis longitudinal (36). 9. Powder spray coating booth according to at least one of the preceding claims, characterized in that at least one spray wall (8) next to the spray zone (8) is formed in each case at least one gun insertion slot (60) extending from bottom to top, whose slot width approximates an automatic gun, to introduce it from the outside of the spray coating booth in the spray zone. 10. Powder spray coating booth according to at least one of the preceding claims, characterized in that the doors (2) are arranged in the longitudinal direction and / or in the transverse direction of the powder spray coating booth throughout the length and / or the entire width of the spray zone (8), and because the part under the doors (2) of the cabin floor (6) extends for at least 75% of the internal width of the cabin in the spray zone (8). 11. Powder spray coating booth according to at least one of the preceding claims, characterized in that a hand-covered space (70) is formed next to at least one longitudinal direction end of the doors (2), which has a floor surface (84), which is located at the same height or higher than the upper edge of the doors (2) in the partially open position and in the fully open position, with one end of the surface (84) being arranged floor of the manual covering space (70) adjacent to the aforementioned longitudinal direction end of the doors (2), so that excessive dust deposited on the floor surface (84) can be transported to the doors (2) and then can fall by the force of gravity between the interstices (28, 30, 32) of dust passing to the extraction channel (20). 12. Powder spray coating booth according to claim 11, characterized in that the manual coating space (70) is formed within the powder spray coating booth; because in at least one cabin wall on the floor surface (84) of the manual coating space (70) a manual coating hole (80) is formed, the size and position of which are suitable for directing a hand gun (72) from the outside of the spray coating booth in the direction of an object to be coated in the spray coating booth and in this regard visually observe the spray jet and the object (10) to be coated by a person, who Holds the hand gun.