EP0678335A2 - Cabine de poudrage - Google Patents

Cabine de poudrage Download PDF

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Publication number
EP0678335A2
EP0678335A2 EP95104618A EP95104618A EP0678335A2 EP 0678335 A2 EP0678335 A2 EP 0678335A2 EP 95104618 A EP95104618 A EP 95104618A EP 95104618 A EP95104618 A EP 95104618A EP 0678335 A2 EP0678335 A2 EP 0678335A2
Authority
EP
European Patent Office
Prior art keywords
cleaning device
cleaning
cabin according
movement
powder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95104618A
Other languages
German (de)
English (en)
Other versions
EP0678335A3 (fr
Inventor
Karl-Heinz Birkhofer
Wolfgang Söhnchen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
German Powder Systems & Co KG GmbH
Original Assignee
Graco Verfahrenstechnik GmbH
Boellhoff Verbindungstechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Graco Verfahrenstechnik GmbH, Boellhoff Verbindungstechnik GmbH filed Critical Graco Verfahrenstechnik GmbH
Publication of EP0678335A2 publication Critical patent/EP0678335A2/fr
Publication of EP0678335A3 publication Critical patent/EP0678335A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
    • B05B14/41—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by cleaning the walls of the booth

Definitions

  • the invention relates to a powder coating booth with a work space which is enclosed by boundary walls, namely side walls, a ceiling and a floor, and with a cleaning device for cleaning at least a part of the boundary walls, which is movable through the work space and which is on at least part of the Has boundary walls adjacent cleaning elements.
  • DE 35 16 826 C2 shows a longitudinally movable cleaning device in the interior of a coating booth with a pipe ring system adapted to the shape of the booth, which can be moved back and forth in the booth by motor.
  • nozzles on the pipe ring system Blow off the cabin walls with intermittent compressed air.
  • the adhering powder is not only blown off, but also whirled up, so that it takes a relatively long time to remove the powder from the working space with the necessary reliability.
  • EP 0 200 681 B1 shows an electrostatic powder coating system with a cleaning device adapted to the interior shape of the cabin, which is suspended from rails and can be driven through the cabin.
  • This cleaning device also works with compressed air that emerges from openings in the frame.
  • the cleaning device can have sponges, brushes, rags, cloths or leather that wipe over the boundary walls.
  • a satisfactory cleaning result cannot always be achieved due to the whirling up of the powder adhering to the walls.
  • the invention has for its object to clean a powder coating booth quickly and thoroughly.
  • This measure makes it possible to make the speed at which the cleaning elements are guided over the respective boundary walls independent of the speed of advance of the cleaning device through the working area. Since the cleaning effect depends, among other things, on the speed of the cleaning elements in relation to the surface to be cleaned, the cleaning result can be improved by a corresponding adjustment of the circulating speed.
  • the cleaning elements are preferably arranged on at least one rotating conveyor belt. With such a carrier tape, the circulation of the cleaning elements can be carried out relatively easily.
  • the cleaning elements are driven at a greater speed than the boundary walls than the rate of advance of the cleaning device through the working space.
  • the two speeds be decoupled from one another with the invention. You can also choose a higher speed for the actual cleaning and thus improve the cleaning result without having to move the cleaning device overall faster.
  • the movement itself is not problematic.
  • the start-up, in which the mass of the cleaning device must be accelerated, and the braking on are problematic End of the cabin at which the mass has to be decelerated again. With the decoupling of the two movements of cleaning element and cleaning device from one another, this problem is largely alleviated.
  • the floor is substantially flat or that the cleaning device can be moved on the floor.
  • the cleaning device no longer has to be suspended from the transport system that is also used to transport the workpieces into the work area. This simplifies the workflow.
  • guiding the cleaning device on the floor has the advantage that a reference point between the cleaning device and a boundary wall, namely the floor, is already defined here. The cleaning elements can therefore be moved to the boundary walls with greater accuracy.
  • the floor is accessible.
  • the cleaning device has a self-running gear with a drive. This considerably simplifies the construction.
  • the drive which is installed on the self-running gear, can be more easily synchronized with the drive of the cleaning elements, so that overall better control of the movement of the cleaning elements is possible.
  • a control device is preferably provided with at least one sensor that detects the end of the working space and interrupts the propulsion of the cleaning device for at least a period of time that is sufficient for the cleaning elements to carry out a predetermined part of their circulation. As soon as the cleaning device has reached the end of the booth, the detached or stripped powder is still distributed to the individual in the circumferential direction Cleaning elements. If the cleaning elements can still carry out at least part of their circulation, you have the opportunity to clean off all powder residues.
  • the cleaning device has a base frame on which deflection rollers are arranged on levers which are adjustable in height and / or in side and / or angle. This makes it relatively easy to adapt the circulation of the cleaning elements to different cabins. This makes the arrangement very flexible.
  • the carrier tapes are supported on the sliding surfaces and / or support rollers between the deflection rollers.
  • the cleaning elements can then be pressed against the side walls with a larger and above all with a defined contact pressure, which in turn significantly improves the cleaning result.
  • a plurality of cleaning elements are arranged one behind the other in the circumferential direction, their spacing, their width acting on the boundary wall and their speed being so matched to the advancing speed of the cleaning device that, in operation, practically every surface element of the boundary walls is covered by a cleaning element at least twice.
  • This fact can also be expressed in such a way that the quotient of width and speed of advance is greater than the quotient of distance and speed of revolution. If each surface element is covered by a cleaning element at least twice, the cleaning effect is naturally better.
  • the advantage of the higher circulation speed is evident. With a higher rotational speed, it is even easier to achieve in this embodiment that each surface element of the Boundary walls are often cleaned by a cleaning element.
  • the cleaning elements are preferably bevelled at least on their rear side in the direction of movement of the cleaning device. This takes into account the fact that, especially when cleaning the ceiling, a certain time elapses from the moment when the powder residues are detached from the ceiling to the time when they fall onto the carrier tape carrying the cleaning elements. During this time, however, the cleaning device has already covered a certain distance, so that under certain circumstances the detached powder could fall past the cleaning device into an already cleaned area. This effect can be avoided by chamfering. It is ensured that a section of the carrier tape is still available to collect the detached powder.
  • a discharge opening extending in the direction of movement of the cleaning device is preferably provided in the region of the base and the cleaning elements convey powder in the direction of the discharge opening.
  • the detached powder no longer has to be transported through the entire length of the work area. It is sufficient to convey the detached powder to the discharge opening. It can fall in there and be transported away.
  • the discharge opening is subjected to negative pressure. Powder that gets close to the discharge opening is then carried away by the suction effect and transported away. However, this suction effect alone is not sufficient to clean the cabin. It usually works to a sufficient extent only on the immediate area in the vicinity of the discharge opening.
  • the cleaning device has a coarse cleaning device and at least one fine cleaning device which are arranged one behind the other in the direction of movement of the cleaning device.
  • the side walls are therefore first cleaned by the coarse cleaning device, with most of the adhering powder being detached.
  • the subsequent fine cleaning device then removes the traces of the powder that are still left.
  • the cleaning elements of the coarse cleaning device preferably wipe the side walls from top to bottom.
  • the powder is not only stripped off here. Because of the force of gravity, it can then come down together with the cleaning elements migrating downward into the region of the floor, where it can be conveyed towards the discharge opening without any problems. In this way the shortest way to remove the powder is always chosen.
  • the coarse cleaning device has two belts driven in the opposite direction, with both belts partially overlapping on the floor and ceiling in the direction of movement of the cleaning device and each belt having a strand which is guided through the working area without touching the wall.
  • Each belt therefore cleans a side wall and part of the ceiling and floor, the overlap ensuring that the entire ceiling and floor are actually freed from the powder.
  • the cleaning elements of the coarse cleaning device are designed as wipers. With the necessary strength and force, the scraper bars can be guided over the boundary walls and loosen the paint residues that adhere there.
  • the fine cleaning device advantageously has at least one sponge-like belt which is driven in rotation.
  • This arrangement has advantages in particular in connection with the scraper webs of the coarse cleaning device.
  • the scraper bars mechanically remove a large part of the adhering powder. In many cases, however, you cannot work precisely enough to actually remove the powder without residue. Spongy tapes are much more suitable for this. These wipe the boundary walls, so to speak.
  • the band has a triangular cross section.
  • the contact between the sponge-like band and the boundary walls is approximately linear, in which case, of course, a certain surface area will be observed in the contact zone.
  • the investment power is concentrated in a relatively small area, so that cleaning is carried out with the necessary security.
  • the fine cleaning device preferably has at least two belts with opposite directions of rotation.
  • the first belt can be referred to as a fine cleaning belt and the following belt as a fine cleaning belt. Traces remaining from the first tape are more or less completely removed by the second sponge-like tape. What is left can then have practically no negative effects if another one follows Color is used in the coating.
  • the opposite direction of rotation prevents streaks from developing. If streaks or streaks should have resulted from cleaning with the first band due to any coincidence, the movement of this band will always be at a certain angle to these streaks when using the second band, so that they do not also fit into the second Can emboss the tape.
  • the cleaning device preferably has a conveyor slot cleaning device at its front end in the direction of movement. It is practically impossible to prevent powder from being deposited in the front slot.
  • the conveyor slot cleaning device removes this. Since it is arranged at the front end of the cleaning device, the powder dissolved by it falls down and can be transported away from the subsequent cleaning device.
  • the cleaning device can only be moved in one direction through the working space. This ensures that the cleaning device must be removed from the work area when it is dirty. It can therefore be cleaned outside the work area and, when moving back, bring powder that has not been dissolved back into the work area.
  • a powder coating booth 1 has a housing 2 with a working space 3, which is enclosed by boundary walls, namely two side walls 4, 5, a ceiling 6 and a floor 7. In a manner not shown, doors are provided on the front and on the rear end wall, which are parallel to the plane of the drawing in FIG. 1.
  • a conveyor slot 8 is provided in the ceiling 6.
  • a conveyor system 9, which is only shown schematically, is arranged above the conveyor slot 8. Hanging on the conveyor system, workpieces can be transported into the work area 3 in order to be coated with powder there. Coating with powder is known and is therefore not described in more detail below. The necessary coating nozzles or the openings in the walls 4, 5 are also not shown.
  • the work area 3 with its boundary walls 4, 5, 6, 7 is arranged on a frame 10. Under the floor 7, therefore, a supply room 11 remains free, in which a suction channel 12 is arranged.
  • the suction channel 12 is connected to a suction fan 13.
  • it is connected to the working space 3 via a slot 14 over practically its entire length. With increasing distance from the suction fan 13, the cross section of the suction channel 12 decreases, so that practically a constant suction pressure can be generated in the slot 14 over the entire length.
  • the slot 14 serves as a discharge opening.
  • the work area has to be cleaned 3 required before workpieces can be coated with powder of a different color.
  • Powder coating does not deposit all of the powder on the workpiece. Part of the powder falls on the floor 7. Another part of the powder settles on the ceiling 6 and the side walls 4, 5 and adheres there. The adhering powder can, however, dissolve again over time and fall not only on the cabin floor 7, but also on a workpiece located in the work area 3. This would result in unintentional color admixtures that should be avoided.
  • the cleaning device has a base frame 16 located on a carriage 15.
  • the carriage 15 has a drive 17 which acts on its chassis 18 and is provided with a control device 44 and which moves the carriage 15 through the working space 3 in the direction of the arrow 19, and only in this direction.
  • the cleaning device must therefore be inserted into the working space 3 at one end and removed from it again at the other end. This has the advantage that the cleaning device can be cleaned between two passes through the work area 3 outside the work area 3.
  • the direction shown by arrow 19 is referred to below as the direction of movement.
  • a plurality of levers 20 are arranged on the base frame 16 so as to be adjustable in height and are also arranged on the base frame 16 so as to be variable in angle.
  • the levers 20 can also be arranged such that they can be changed sideways.
  • the levers 20 have deflection rollers 21.
  • the positions of the deflection rollers 21 can be changed over a relatively wide range.
  • the deflection rollers 21 are aligned so that they are guided close to the "corners" of the working space 3. However, these "corners” are rounded and they have approximately the same radius of curvature as the deflection rollers 21.
  • the cleaning device 22 has a coarse cleaning device 23, a fine cleaning device 24 and a fine cleaning device 25, which are arranged one behind the other in the direction of movement 19. First the walls are cleaned by the coarse cleaning device 23, then by the fine cleaning device 24 and finally by the fine cleaning device 25.
  • the coarse cleaning device 23 has two belts 26, 27 which are driven in rotation around the deflection rollers 21. Their direction of rotation is essentially perpendicular to the direction of movement. The direction of rotation is represented by the arrows 28, 29.
  • each additional deflection rollers 30, 31 are rotatably mounted on the base frame 16, ie a total of two pairs. These additional deflection rollers 30, 31, which are otherwise provided for each of the two belts 26, 27, allow the belts 26, 27 each adjacent to one of the two side walls 4, 5 to a part of the ceiling 6 and a part of the Floor 7 to guide, each band 26, 27 has a strand 32, 33 which runs in the middle of the work space 3.
  • Scraper webs 34 are arranged on the belts 26, 27, each abutting the side walls 4, 5, the ceiling 6 and the cabin floor 7 and detaching powder adhering there. Due to the deflection rollers 30, 31, the belts 26, 27 can now be guided so that the stripping webs 34 on the side walls 4, 5 are always only from top to bottom. On the ceiling 6, they are guided essentially from the inside out and on the floor 7 from the outside in. As a result, powder which is pushed or conveyed forward by the scraper webs 34 can enter the slot 14, from where it is sucked off by the suction fan 13.
  • the scraper bars have approximately the shape of a trapezoid, i.e. they are chamfered at least on the rear side in the direction of movement v of the cleaning device 22. In addition, they have the shape of a trapezoid in cross section with a very narrow front.
  • the side lying on the walls 4, 5, 6, 7 has the width b.
  • the distance between adjacent stripping webs 34 should be a.
  • the belt 26 is moved at a speed g in the direction of rotation.
  • the speed at which the cleaning device 22 is moved through the working space 3 in the direction of movement should be v.
  • the speed of advance v i.e. the speed at which the cleaning device 22 is moved through the working space 3 can be selected independently of the rotational speed of the belts 26, 27.
  • the stripping webs 34 can also be inclined at an angle ⁇ , which is less than 90 °, with respect to the edge of the belt 26. As a result, the scraped-off powder is simultaneously conveyed in the direction of movement during the circulating movement of the belt.
  • the bands 26, 27 are supported in the region of the side walls 4, 5, the ceiling 6 and the bottom 7 by support rollers 35.
  • the scraper webs 34 are therefore always with the necessary contact pressure on the boundary walls of the work area 3.
  • the fine cleaning device 24 is constructed in exactly the same way as the fine cleaning device 25. It has a sponge-like, circumferentially driven belt 36 with an essentially triangular cross section, which rotates in the direction of an arrow 37. With the fine cleaning device 24, it is not necessary that the side walls 4, 5 are only painted from top to bottom. In this case, a single circulating belt 36 is therefore sufficient. In the same way, the fine cleaning device 25 has a circulating belt 38 which rotates in the direction of an arrow 39. The directions of rotation 37, 39 are opposite to each other. All deflection rollers for the belts 26, 27, 36, 38 can be arranged on the same shafts 40, 41.
  • the cleaning device 22 also has a conveyor slot cleaning device 42, which is arranged at its front end.
  • the cleaning slot conveyor 42 wipes the walls of the conveyor slot 8. Powder falling down is removed from the belts 26, 27 in the direction of the slot 14.
  • a sensor 43 is arranged at the front end of the cleaning device 22 and is connected to the drive 17 or its control 44. As soon as the sensor 43 detects that the cleaning device has been moved through the working area, the drive 17 is stopped, so that the cleaning device 22 no longer moves through the working area 3.
  • the controller 44 drives the belts 26, 27, 36, 38 on and on such a distance that all stripping webs 34 have once been passed over the slot 14. Powder, which is therefore still between the scraper webs, is thus reliably conveyed to slot 14 and unloaded there.
  • the cleaning of the cabin now works as follows.
  • the cleaning device 22 is inserted into the working space 3 at one end of the cabin 1 and in the direction of the arrow 19, i.e. move in the direction of movement.
  • the belts 26, 27, 36, 38 are driven all around with different directions of movement.
  • the stripping webs 34 will detach most of the adhering powder from the boundary walls 4, 5, 6, 7 and transport them in the direction of the slot 14.
  • a fine or fine cleaning is then carried out by the sponge-like bands 36, 38 lying approximately linearly on the boundary walls 4, 5, 6, 7.
  • the drive speed g of the belts 26, 27, 36, 38 can be selected independently of the movement speed v of the cleaning device 22. In particular, it can be selected practically exclusively from the point of view that the stripping webs 34 optimally detach the powder residues from the boundary walls 4, 5, 6, 7.

Landscapes

  • Cleaning In General (AREA)
EP95104618A 1994-04-18 1995-03-29 Cabine de poudrage Withdrawn EP0678335A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4413348A DE4413348A1 (de) 1994-04-18 1994-04-18 Pulverbeschichtungskabine
DE4413348 1994-04-18

Publications (2)

Publication Number Publication Date
EP0678335A2 true EP0678335A2 (fr) 1995-10-25
EP0678335A3 EP0678335A3 (fr) 1997-12-17

Family

ID=6515705

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95104618A Withdrawn EP0678335A3 (fr) 1994-04-18 1995-03-29 Cabine de poudrage

Country Status (2)

Country Link
EP (1) EP0678335A3 (fr)
DE (1) DE4413348A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0839581A1 (fr) 1996-11-02 1998-05-06 Josef Hasler Cabine de poudrage avec doublure intérieur flexible
EP0855226A1 (fr) * 1996-12-19 1998-07-29 Range und Heine GmbH Cabine de pulvérisation pour peintures à base d'eau avec installations intérieures refroidies et un humidificateur d'air
CN105080772A (zh) * 2015-08-27 2015-11-25 余充沛 立式粉末喷涂喷房清理装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3538800A1 (de) * 1985-10-31 1987-05-07 Intec Maschinenbau Gmbh Pulverspruehkabine fuer die pulverbeschichtung von werkstuecken
EP0200681B1 (fr) * 1985-04-30 1990-06-06 Ramseier, H.U. Installation de revêtement électrostatique

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2219040A1 (de) * 1972-04-19 1973-10-31 Otto Mueller Ohg Maschinen U T Spruehkabine zum verspruehen von kunststoffpulver auf gegenstaende zum zwecke ihrer ummantelung mit einer kunststoffschicht
DE3318043A1 (de) * 1983-05-18 1984-11-22 Martin 3108 Winsen Becker Einrichtung zum beschichten von gegenstaenden
DE3500005A1 (de) * 1985-01-02 1986-07-10 ESB Elektrostatische Sprüh- und Beschichtungsanlagen G.F. Vöhringer GmbH, 7758 Meersburg Beschichtungskabine zum ueberziehen der oberflaeche von werkstuecken mit beschichtungspulver
DE3941927C1 (fr) * 1989-12-19 1991-05-29 Wagner International Ag, Altstaetten, Ch
FR2675061B1 (fr) * 1991-04-12 1993-07-16 Sames Sa Cabine de revetement d'objets par poudrage.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0200681B1 (fr) * 1985-04-30 1990-06-06 Ramseier, H.U. Installation de revêtement électrostatique
DE3538800A1 (de) * 1985-10-31 1987-05-07 Intec Maschinenbau Gmbh Pulverspruehkabine fuer die pulverbeschichtung von werkstuecken

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0839581A1 (fr) 1996-11-02 1998-05-06 Josef Hasler Cabine de poudrage avec doublure intérieur flexible
EP0855226A1 (fr) * 1996-12-19 1998-07-29 Range und Heine GmbH Cabine de pulvérisation pour peintures à base d'eau avec installations intérieures refroidies et un humidificateur d'air
US6168664B1 (en) 1996-12-19 2001-01-02 Range Und Heine Gmbh Arrangement for coating objects with water soluble and water diluteable coating materials
CN105080772A (zh) * 2015-08-27 2015-11-25 余充沛 立式粉末喷涂喷房清理装置
CN105080772B (zh) * 2015-08-27 2017-09-29 佛山市涂瑞科技有限公司 立式粉末喷涂喷房清理装置

Also Published As

Publication number Publication date
EP0678335A3 (fr) 1997-12-17
DE4413348A1 (de) 1995-10-26

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