EP3043923B1 - Pulverversorgung mittels einer dichtstrompumpe für eine beschichtungsanlage - Google Patents

Pulverversorgung mittels einer dichtstrompumpe für eine beschichtungsanlage Download PDF

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Publication number
EP3043923B1
EP3043923B1 EP14752645.3A EP14752645A EP3043923B1 EP 3043923 B1 EP3043923 B1 EP 3043923B1 EP 14752645 A EP14752645 A EP 14752645A EP 3043923 B1 EP3043923 B1 EP 3043923B1
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EP
European Patent Office
Prior art keywords
powder
chamber
pump
dense phase
supply device
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.)
Active
Application number
EP14752645.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3043923A1 (de
Inventor
Felix Mauchle
Marco Sanwald
Hanspeter Vieli
Hans-Peter Lüthi
Stefan Breitenmoser
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.)
Gema Switzerland GmbH
Original Assignee
Gema Switzerland GmbH
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Filing date
Publication date
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Publication of EP3043923A1 publication Critical patent/EP3043923A1/de
Application granted granted Critical
Publication of EP3043923B1 publication Critical patent/EP3043923B1/de
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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
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/1472—Powder extracted from a powder container in a direction substantially opposite to gravity by a suction device dipped into the powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/1459—Arrangements for supplying particulate material comprising a chamber, inlet and outlet valves upstream and downstream the chamber and means for alternately sucking particulate material into and removing particulate material from the chamber through the valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F1/00—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped
    • F04F1/02—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped using both positively and negatively pressurised fluid medium, e.g. alternating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F1/00—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped
    • F04F1/18—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped the fluid medium being mixed with, or generated from the liquid to be pumped
    • 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
    • B05B14/43—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by filtering the air charged with excess material
    • 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
    • B05B14/45—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths using cyclone separators
    • 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
    • B05B14/48—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths specially adapted for particulate material

Definitions

  • the present invention relates to a powder supply device for a powder coating system according to independent claim 1.
  • the device according to the invention is particularly suitable for the powder supply of a powder coating system used for electrostatic spray coating of objects, in which fresh coating powder (hereinafter also called “fresh powder”) and optionally recovered coating powder (hereinafter also referred to as “Recoverypulver”) in the powder container and by a powder dispenser of a spray device are supplied.
  • fresh coating powder hereinafter also called “fresh powder”
  • Recoverypulver optionally recovered coating powder
  • the spray device can be designed, for example, as a hand spray gun or as an automatic spray gun.
  • the powder dispenser is usually a powder injector.
  • compressed air is forced through a venturi connection of the powder injector through a Venturi nozzle into a catching nozzle.
  • the conveying air comes past a connected to the powder container powder suction pipe, where by suction from the powder container coating powder is sucked.
  • the powder container is supplied with fresh powder from a supplier container via a fresh powder line, in which the powder supplier delivers the fresh powder to the powder user.
  • a fresh powder line in which the powder supplier delivers the fresh powder to the powder user.
  • the powder is a compact mass.
  • the coating powder in the powder container should be in a fluidized state so that it can be pumped out, for example, by the suction action of the powder dispenser (powder injector) and fed into a powder stream of the spray device.
  • a powder supply device thus contains in particular a powder container which serves as a powder chamber for storing coating powder, wherein usually the coating powder is fluidized in powder containers so that it is pneumatically more easily conveyed, either to another powder container or to a powder spray device
  • WO2012 / 112655 A2 and EP0606577 A1 disclose coating powder conveyors with injectors.
  • WO2008 / 099255 A1 and DE202007019632 U1 disclose coating powder conveyors with pumps.
  • the powder spray device may be a manual or an automatic powder spray device, which may have a spray nozzle or a rotary atomizer.
  • the invention is based on the problem that known powder supply devices basically have a high compressed air requirement. Moreover, with the conventional powder supply devices, it is difficult to produce a precisely adjustable continuous powder flow.
  • the present invention has for its object to provide a powder supply device, which has a reduced compressed air requirement during operation and also reaches a maximum of precision in terms of the powder flow rate.
  • the invention relates in particular to a powder supply device for a powder coating system with at least one powder container, which has a powder chamber for coating powder.
  • a powder supply device for a powder coating system with at least one powder container, which has a powder chamber for coating powder.
  • no powder injector is used in the solution according to the invention as a powder dispenser; Rather, at least one powder seal pump is provided with the a powder discharge channel opening via a powder discharge opening in the powder chamber is connected or connectable to suck coating powder from the powder chamber in the powder coating operation of the powder coating plant.
  • the at least one powder sealant pump of the powder supply device is designed in particular as a single-chamber powder seal current pump, which has a single powder feed chamber for conveying the coating powder.
  • the powder supply device achieves a large number of advantages.
  • a powder sealant pump in particular a single-chamber powder sealant pump
  • a maximum of precision in terms of powder flow rates can be achieved.
  • the powder supply device has a significantly reduced air consumption compared to powder injectors through the powder seal pump.
  • the powder pump is connected or connectable directly to the powder discharge channel which opens out via a powder discharge opening in the powder chamber.
  • the space requirement is considerably reduced by the powder supply device according to the invention.
  • the powder discharge channel is formed in a side wall of the powder container and the powder sealant pump is connected or connectable to the powder discharge channel via an intake pipe connection.
  • the powder pump can be mounted particularly close to the powder container.
  • the powder pump is mounted in a particularly short distance from the powder discharge opening designed as a suction pump. Accordingly, the lifting work which must be done to convey the coating powder through the powder discharge channel is fundamentally reduced. Also, the short suction distance has a positive effect on the adjustability and reproducibility of the powder flow.
  • the powder sealant pump is over a separate Ansaugrohrstutzen connected to the powder discharge channel or can be connected via it. With the help of Ansaugrohrstutzens it is conceivable that already known powder container retrofitted with the designed as a one-chamber pumps Pulverdichtstrompumpen be retrofitted.
  • the powder supply device has an intake pipe which is fluidly connected or connectable with a through-hole of the intake pipe stub.
  • the intake pipe is in particular designed such that it can be inserted into the powder discharge channel.
  • the intake pipe which is connected to the Ansaugrohrstutzen or connectable, the inner diameter of the powder discharge channel can be varied in a simple manner.
  • the intake pipe may have an inner diameter of 3 mm to 10 mm, preferably an inner diameter of 5 mm to 8 mm, and more preferably an inner diameter of 4 mm.
  • the intake pipe has a funnel region on an end region facing away from the intake manifold, which comprises an expanded inner diameter.
  • the funnel area effectively prevents deposits of coating powder on the intake manifold. This is the case in particular because a gradual transition between the inner diameter of the powder discharge channel and the inner diameter of the intake pipe is created by the funnel region.
  • the intake pipe may have a length which substantially corresponds to the length of the powder channel.
  • the inner diameter of the powder channel can be easily reduced along its entire length.
  • the length of the intake pipe is dimensioned such that the intake pipe just does not penetrate into the interior of the powder chamber.
  • the powder discharge channel has a lower end region, via which powder discharge channel opens into the powder chamber via a powder discharge opening.
  • an upper end portion is provided to which the suction pipe stub is attached or attachable with the upper end portion of the powder discharge channel being at an upper end portion of the powder container.
  • the intake pipe stub, and thus the powder seal pump is attached to an upper end portion of the powder container. This avoids that the coating powder from the powder chamber in the powder pump increases, as long as it is not turned on.
  • the upper end region of the powder discharge channel can have a preferably cylindrical recess, which is designed to receive the preferably cylindrical intake pipe connection. Accordingly, the Ansaugrohrstutzen can be connected in a particularly simple manner non-positively with the upper end portion of the powder discharge channel.
  • the intake manifold is attached via fastening means at the upper end of the powder discharge channel.
  • the employment means e.g., fixing screws
  • the intake manifold may be introduced, for example, into the housing of the powder container. It is particularly preferred to design the intake manifold in such a way and to receive in the recess that the Ansaugrohrstutzen protrudes above the upper end of the powder container.
  • the intake manifold forms according to this implementation an extension, whereby the at least one powder pump can be attached to the powder container of the powder supply device according to the invention.
  • the at least one powder pump can be attached to the powder container of the powder supply device according to the invention.
  • mount the at least one powder pump on the extension formed by the intake manifold.
  • the powder seal current pump has a connecting element which is detachably attached to a first end region of the powder seal current pump facing the intake pipe socket.
  • the connecting element is in particular designed to produce a frictional connection between the intake manifold and the powder seal pump.
  • the connecting element is used in particular to a To realize connection of a conveying channel located in the powder pump with the powder discharge channel.
  • the connecting element may preferably have a recess formed on the intake manifold end portion.
  • the recess is in particular adapted to receive the projecting portion (extension) of the Ansaugrohrstutzens.
  • the connecting element it is of course also possible for the connecting element to be connected to the intake manifold by fastening elements (for example fastening screws).
  • the powder sealant pump has a powder inlet connected or connectable to the (upstream) powder discharge channel and a powder outlet connected or connectable to a (downstream) output side powder reservoir or device for spraying the coating powder.
  • the powder outlet can be arranged on a first end region of the powder sealant flow pump and the powder outlet on an opposite second end region of the powder sealant flow pump, the (single) powder delivery chamber being arranged between the powder inlet and the powder outlet of the powder sealant flow pump.
  • the above-mentioned connecting member may be so connected or connectable to the powder inlet of the powder sealant pump so that the powder inlet of the powder sealant pump is substantially flush with an outer surface of the sidewall.
  • the powder inlet is mounted as close as possible to the upper end portion of the powder discharge channel. As a result, the suction is shortened again, whereby the lifting work is reduced to powder extraction.
  • the (preferably only) powder conveying chamber of the powder sealant pump has a chamber inlet at a first end region and a chamber outlet at an opposite second end region.
  • the powder sealant pump further comprises a powder inlet valve via which the chamber inlet of the powder delivery chamber is fluidly connected or connectable to the powder inlet of the powder sealant pump, and a powder outlet valve via which the chamber exit of the single powder delivery chamber is fluidly connected or connectable to the powder outlet of the powder sealant pump.
  • the powder pump is operated in particular in two different pumping phases. Specifically, this involves an intake phase and a delivery phase, which are known in principle from the prior art regarding powder sealant pumps. Accordingly, a particularly continuous powder delivery is achieved with the powder supply device according to the invention. Also, it can be prevented by the powder inlet valve that coating powder penetrates through the powder discharge line in the powder feed chamber in the deactivated state of the powder pump.
  • a control device is furthermore provided, which is designed in such a way to actuate the powder inlet valve and / or the powder outlet valve of the powder sealant pump alternately.
  • the control device is in particular designed to alternately apply an overpressure and a negative pressure in the (single) powder feed chamber of the powder seal current pump.
  • this allows a two-phase operation of the powder pump can be achieved. Specifically, by applying a negative pressure, a suction phase and by applying an overpressure, a delivery phase is initiated. It is particularly advantageous if the powder inlet valve and the powder outlet valve can be controlled separately by the control device.
  • the powder inlet valve and the powder outlet valve of the powder supply device according to the invention are each designed as a pinch valve, in particular of the construction, which have a flexible, flexible hose as a valve channel, said flexible elastic hose for closing the corresponding valve by means of actuating compressed air in a pressure chamber surrounding the hose fauxquetschbar is.
  • the valve element should be arranged in the interior of the pinch valve housing such that the powder inlet of the pinch valve can be brought into fluid communication with the powder outlet of the pinch valve via the valve element shown as a hose.
  • the pinch valve housing has at least one connection for supplying compressed air as needed (actuating compressed air) into the space formed between the inner wall of the pinch valve housing and the valve element arranged in the interior of the Quetschventilgephases chamber (pressure chamber).
  • actuating compressed air an overpressure is formed in this pressure chamber between the inner wall of the pinch valve housing and the valve element, as a result, the valve element is pressed together in the radial direction and the pinch valve is closed.
  • pressure is subsequently released in the pinch valve housing (for example by applying a negative pressure)
  • the valve element returns to its initial state, so that a fluid connection exists between the powder inlet of the pinch valve and the outlet of the pinch valve via the valve element.
  • the pinch valve housing has at least one connection for applying a negative pressure as needed in the interior of the pinch valve housing, in order in this way to considerably reduce the opening time of the pinch valve.
  • Additional pressure inlet device used.
  • This additional pressure inlet device opens at at least one point in the powder path between the powder outlet valve arranged in the single powder delivery chamber and the powder outlet of the powder sealant pump or preferably immediately downstream the Pulverauslasses the powder sealant pump and is used for on-demand supply of additional compressed air, which serves as additional transport compressed air.
  • transport air is additionally fed at suitable times or events by means of the auxiliary compressed air inlet device immediately before or after the powder outlet of the powder sealant pump.
  • the powder supply device has a plurality of powder seal pumps, in particular single-chamber powder seal pumps, which are each connected or connectable to a powder discharge channel of the powder chamber.
  • the powder discharge channels of the plurality of powder seal pumps are formed in two opposite side walls of the powder chamber.
  • the powder pump as a single-chamber powder seal pump, it is possible to maximize the number of powder pumps used. As a result, a particularly high conveying capacity is achieved.
  • the at least one powder sealant pump is arranged next to the powder chamber such that a side face of the powder sealant pump facing the powder chamber rests flat against an outer surface of the sidewall of the powder chamber.
  • the powder sealant pump is oriented in particular horizontally and is supported on the side wall of the powder chamber.
  • the at least one powder seal current pump is arranged relative to the powder chamber at a height which essentially corresponds to the powder level which can be set in the powder chamber. As already indicated above, this can be achieved be that the lifting work for conveying the coating powder is minimized.
  • the powder chamber of the powder supply device may have any shape, although it is preferred if this is cuboid, cylindrical, conical or frusto-conical. In this context, it is particularly conceivable that the powder chamber is formed below or within a cyclone separator.
  • Fig. 1 schematically shows an exemplary embodiment of a powder coating system 1 with a powder supply device according to the invention for spray coating of articles 2 with coating powder, which is then in an in Fig. 1 not shown heating furnace is melted onto the objects 2.
  • a powder coating system 1 for spray coating of articles 2 with coating powder, which is then in an in Fig. 1 not shown heating furnace is melted onto the objects 2.
  • one or more electronic control units 3 are provided for the control of the function of the powder coating system 1.
  • the coating powder powder pumps 4 are provided. These may be powder seal pumps in which coating powder is sucked from a powder container by means of negative pressure, after which the powder is then expelled under pressure from a powder feed chamber and flows to a spraying device.
  • a compressed air source 6 is provided, which is connected via corresponding Druckeinstellelemente 8, for example, pressure regulator and / or valves to the various devices.
  • Fresh powder from a powder supplier is from a supplier container, such as a small container 12, for example in the form of a dimensionally stable container or a bag with a powder amount of, for example, between 10 to 50 kg, for example 25 kg, or for example a large container 14, for example also a dimensionally stable container or a bag, with a powder amount between, for example, 100 kg and 1,000 kg may be supplied by means of a powder pump 4 in a fresh powder line 16 or 18 of a screening device 10.
  • the screening device 10 may be provided with a vibrator 11.
  • the terms "small container” and "large container” mean in each case both "dimensionally stable container” and “non-dimensionally stable, flexible bag", except where expressly referred to one or the other Be Strukturnisart.
  • the coating powder sieved by the sieve device 10 is conveyed by gravity or preferably in each case by a powder pump 4 via one or more powder supply lines 20, 20 'through powder inlet openings 26, 26' into a powder chamber 22 of a dimensionally stable powder container 24.
  • the volume of the powder chamber 22 is preferably substantially smaller than the volume of the fresh powder small container 12.
  • the powder pump 4 of the at least one powder supply line 20, 20 'to the powder container 24 is a compressed air push pump.
  • the initial portion of the powder feed line 20 may serve as a pump chamber into which powder sifted by the sieve device 10 falls through a valve, for example, a pinch valve.
  • the powder supply line 20 is fluidically separated by closing the valve of the screening device 10. Thereafter, the powder portion is pushed by compressed air through the powder supply line 20, 20 'in the powder chamber 22.
  • Powder pumps 4 for example powder seal pumps 200, for conveying coating powder through powder lines 38 to spray devices 40 are connected to one or preferably a plurality of powder outlet openings 36 of the powder container 24.
  • the spray devices 40 may include spray nozzles or rotary atomizers for spraying the coating powder 42 onto the article 2 to be coated, which is preferably located in a coating booth 43.
  • the Pulverauslassö réelleen 36 can - as in Fig. 1 shown - located in a wall of the powder container 24, which is opposite to the wall in which the powder inlet openings 26, 26 'are located.
  • the powder outlet openings 36 are arranged in a wall which is adjacent to the wall in which the powder inlet openings 26, 26 'are located.
  • the powder outlet openings 36 are preferably arranged near the bottom of the powder chamber 22.
  • the powder chamber 22 preferably has a size in the range of a capacity of coating powder between 1.0 kg and 12.0 kg, preferably between 2.0 kg and 8.0 kg.
  • the size of the powder chamber 22 is preferably between 500 cm 3 and 30,000 cm 3 , preferably between 2,000 cm 3 and 20,000 cm 3 .
  • the size of the powder chamber 22 is selected depending on the number of powder outlet openings 36 and the powder lines 38 connected thereto so that a continuous spray coating operation is possible, however, the powder chamber 22 can be cleaned quickly in coating pauses for a powder change, preferably automatically.
  • the powder chamber 22 may be provided with a fluidizing device 30 for fluidizing the coating powder received in the powder container 24.
  • the fluidizing device 30 contains at least one fluidising wall of an open-pore or narrow-bore material, which is permeable to compressed air but not to coating powder. Although in Fig. 1 not shown, it is advantageous if in the powder container 24, the fluidizing wall forms the bottom of the powder container 24 and is disposed between the powder chamber 22 and a fluidizing compressed air chamber.
  • the fluidizing compressed air chamber should be connectable via a Druckeinstellelement 8 with the compressed air source 6.
  • Coating powder 42 which does not adhere to the object 2 to be coated, is sucked as excess powder via a surplus powder line 44 into a cyclone separator 48 by means of a suction air flow of a blower 46.
  • the excess powder is separated in Zyklonabscheider 48 as far as possible from the suction air stream.
  • the separated powder portion is then passed as a recovery powder from the cyclone 48 via a powder recovery line 50 to the sifter 10 where it passes through the sifter 10, either alone or mixed with fresh powder via the powder feed lines 20, 20 'back into the powder chamber 22 ,
  • the powder recovery line 50 may also be possible to separate the powder recovery line 50 from the screening device 10 and to pass the recovery powder (recovery powder) into a waste container, as described in US Pat Fig. 1 is shown schematically by a dashed line 51.
  • the powder recovery line 50 may be provided with a switch 52 so that it does not need to be separated from the screening device 10 to which it is alternatively connectable to the screening device 10 or to a waste container.
  • the powder container 24 can have one or more, for example two sensors S1 and / or S2, in order to control the supply of coating powder into the powder chamber 22 by means of the control unit 3 and the powder pumps 4 in the powder feed lines 20, 20 '.
  • the lower sensor S1 detects a lower powder level limit
  • the upper S2 sensor detects an upper powder level limit.
  • the lower end portion 48-2 of the cyclone 48 may be formed and used as a reservoir for recovery powder and provided with one or more, for example, two sensors S3 and / or S4, which are functionally connected to the control unit 3.
  • the fresh powder supply can be automatically stopped by the Frischpulverzutechnischen 16 and 18, as long as enough recovery powder is present in the Zyklonabscheider 48 to supply the powder chamber 22 through the sieve 10 through recovery powder in sufficient quantity, which is required for the spray coating operation by means of the spray devices 40.
  • the exhaust air of the cyclone 48 passes through an exhaust duct 54 in a Nachfiltervoriques 56 and therein by one or more filter elements 58 to the fan 46 and after this in the outside atmosphere.
  • the filter elements 58 may be filter bags or filter cartridges or filter plates or similar filter elements.
  • the powder separated from the airflow by means of the filter elements 58 is normally waste powder and falls by gravity into a waste container or may, as in FIG Fig. 1 shown via one or more waste lines 60, each containing a powder pump 4, are conveyed into a waste container 62 at a waste station 63. Depending on the powder type and powder coating conditions, the waste powder may also be recovered to the screening device 10 to re-enter the coating circuit. This is in FIG. 1 represented by switches 59 and branch lines 61 of the waste lines 60 schematically.
  • cyclone separator 48 is usually used in combination with post-filter device 56 only if it is a problematic coating powder. In this case, only the recovery powder of the cyclone 48 is fed via the powder recovery line 50 of the sifter 10, while the waste powder of the Nachfiltervoriques 56 as waste in the waste container 62 or in another waste container, the last without waste lines 60 directly below an outlet opening of the Nachfiltervortechnisch 56th can be made.
  • the lower end of the cyclone 48 may include an outlet valve 64, such as a pinch valve. Furthermore, a fluidizing device 66 for fluidizing the coating powder may be provided above this outlet valve 64, in or at the lower end of the lower end section 48-2 of the cyclone separator 48 designed as a reservoir.
  • the fluidizing device 66 includes at least one fluidising wall 80 made of an open-pore or narrow-bore material that is pervious to compressed air but not to coating powder.
  • the fluidizing wall 80 is disposed between the powder path and a fluidizing compressed air chamber 81.
  • the fluidizing compressed-air chamber 81 can be connected to the compressed-air source 6 via a pressure-adjusting element 8.
  • the fresh powder line 16 and / or 18 may be fluidly connected at its upstream end, either directly or through the powder pump 4, to a powder delivery tube 70 which enters the delivery container 12 or 14 is immersed to aspirate fresh coating powder.
  • the powder pump 4 may be disposed at the beginning, at the end or in between in the fresh powder line 16 or 18 or at the upper or lower end of the powder conveying tube 70.
  • Fig. 1 shows as fresh powder small container a fresh powder powder bag 12 in a bag receiving hopper 74.
  • the powder bag 12 is held by the bag receiving hopper 74 in a defined shape, wherein the bag opening is located at the upper bag end.
  • the bag receiving hopper 74 may be disposed on a scale or weighing sensors 76. This scale or the weighing sensors 76 can, depending on the type, produce an optical display and / or an electrical signal which corresponds to the weight and thus also the amount of the coating powder in the small container 12 after deduction of the weight of the bag receiving hopper 74.
  • At the bag receiving hopper 74 at least one vibrating vibrator 78 is preferably arranged.
  • Two or more small containers 12 can each be provided in a bag receiving hopper 74 and / or two or more large containers 14, which can be used alternatively. As a result, a quick change from one to another small container 12 or large container 14 is possible.
  • the screening device 10 is integrated in the powder container 24. Furthermore, the screening device 10 can be omitted if the fresh powder has a sufficiently good quality. In this case, it is also possible to use a separate sieve for sifting the recovery powder of the conduits 44 and 55, for example upstream or downstream of the cyclone separator 48 or in the cyclone separator 48 itself. Also the recovery powder will not need a sieve if its powder quality is sufficiently good for reuse.
  • the powder inlet openings 26, 26 ' are arranged in a side wall of the powder container 24, preferably near the bottom of the powder chamber 22.
  • the powder container 24 is also provided in the same side wall of the powder container 24 at least one Restpulverauslass 33 through which in the cleaning operation by means of introduced into the powder chamber 22 cleaning compressed air residual powder from the powder chamber 22 is expelled.
  • the powder container 24 has at least one cleaning compressed air inlet 32-1, 32-2 in a side wall.
  • the cleaning compressed air inlets 32 - 1, 32 - 2 are fluidly connected to a compressed air source 6 via cleaning compressed air supply lines 101 - 1, 101 - 2, 101 - 3 to supply cleaning compressed air to the powder chamber 22.
  • each cleaning compressed air inlet 32-1, 32-2 has an inlet opening in the side wall of the powder container 24, which is identical to a powder inlet opening 26, 26 ', through which the powder coating system 1 powder powder coating plant 1 is supplied to the powder chamber 22 in the powder coating operation.
  • FIGS Fig. 2a and Fig. 2b described powder container 24 described in more detail.
  • At least one outlet opening of a residual powder outlet 33 may be provided, through which in the cleaning operation of the powder coating system 1 with the aid of the cleaning compressed air introduced into the powder chamber 22 Residual powder is expelled from the powder chamber 22.
  • the powder container 24 is equipped with a fluidizing device 30 in order to introduce at least in the powder coating operation of the powder coating system 1 into the powder chamber 22 fluidizing compressed air. Furthermore, the powder container 24 has at least one fluidizing compressed air outlet 31 with an outlet opening, via which the fluidizing compressed air introduced into the powder chamber 22 can be removed again for the purpose of pressure equalization. Preferably, the outlet opening of the fluidizing compressed air outlet 31 is identical to the outlet opening of the residual powder outlet 33.
  • FIGS. 2a and 2b described in detail an exemplary embodiment of a powder container 24 of a powder supply device for a powder coating system 1.
  • the in the FIGS. 2a and 2b shown powder container 24 is particularly suitable as part of the above with reference to the illustration in Fig. 1 described powder coating system 1.
  • the exemplary embodiment is a sealed powder container or container 24 which can be closed with a lid 23, wherein the lid 23 can preferably be connected to the powder container 24 via a connection which can be released quickly.
  • the in Fig. 2a shown powder container 24 has a substantially cuboid powder chamber 22 for receiving coating powder.
  • a side wall 24-3 of the powder container 24 at least one cleaning compressed air inlet 32-1, 32-2 is provided, to which a compressed air source 6 can be connected in a cleaning operation of the powder coating system 1 for removing residual powder from the powder chamber 22 via a compressed air line to initiate the powder chamber 22.
  • a residual powder outlet 33 is provided on the already mentioned side wall 24-3 of the powder container 24, which has an outlet opening via which cleaning powder introduced into the powder chamber 22 can drive out residual powder from the powder chamber 22 during the cleaning operation of the powder coating system 1.
  • a total of two cleaning compressed air inlets 32-1, 32-2 are provided, wherein each of the two cleaning compressed air inlets 32-1, 32-2 has an inlet opening.
  • exactly one residual powder outlet 33 with exactly one outlet opening is provided, wherein the two inlet openings of the cleaning compressed air inlets 32-1, 32-2 are spaced apart in the vertical direction from the outlet opening of the residual powder outlet 34.
  • the outlet opening of the residual powder outlet 33 in an upper region of the side wall 24-3 of the powder container 24 and the two inlet openings of the cleaning compressed air inlets 32-1, 32-2 in a lower region of the side wall 24- 3 of the powder container 24 are provided.
  • the inlet openings on the one hand and the outlet opening on the other hand it is achieved that during the cleaning operation of the powder coating installation 1 from the into the powder chamber 22 introduced cleaning compressed air, the first remaining on the bottom wall 24-2 of the powder container 24 possibly still adhering residual powder is whirled and carried out with the cleaning compressed air through the outlet opening of the Restpulverauslasses 33 from the powder chamber 22.
  • an air roller 35 is formed as shown in FIG Fig. 2a is indicated.
  • this air roller 35 can be effectively dissolved in the cleaning process on the walls 24-1, 24-2, 24-3, 24-4, 24-5 of the powder container 24 and on the lid 23 of the powder container 24, if necessary, still adhering residual powder and be carried out of the powder chamber 22.
  • each cleaning compressed air inlet 32-1, 32-2 in the powder coating operation of the powder coating apparatus 1 functions as a powder inlet 20-1, 20-2, which are fluidly connected to the powder supply lines 20, 20 'as needed.
  • a fluidizing device 30 for introducing fluidizing compressed air into the powder chamber 22 is provided.
  • the fluidizing compressed air can be introduced into the powder chamber 22 through an end wall, side wall, bottom wall or top wall.
  • the bottom wall 24-2 of the powder chamber 22 is formed as a fluidizing bottom. It has a plurality of open pores or small through holes through which fluidizing compressed air can flow upwardly into the powder chamber 22 from a fluidizing pressurized air chamber located below the bottom wall to levitate (fluidize) therein the coating powder in the powder coating operation of the powder coating apparatus 1, so that it is easy to suck with the help of a powder dispenser.
  • the fluidizing compressed air is supplied to the fluidizing compressed air chamber through a fluidizing air inlet. So that the pressure within the powder chamber 22 does not exceed a predetermined maximum pressure during operation of the fluidizing device 30, the powder chamber 22 has at least one fluidizing air outlet 31 with an outlet opening for discharging the fluidizing compressed air introduced into the powder chamber 22 and effecting pressure equalization.
  • the outlet opening of the at least one fluidizing compressed-air outlet 31 should be dimensioned such that, when the fluidizing device 30 is operating in the powder chamber 22, the maximum pressure over the atmospheric pressure is 0.5 bar.
  • the outlet opening of the residual powder outlet 33 is identical to the outlet opening of the fluidizing compressed air outlet 31.
  • the fluidizing compressed air outlet 31 is provided in the lid 23 of the powder container 24, for example.
  • a vent line which is outside the powder chamber 22 connected to a riser 27 or connectable to prevent powder discharge from the powder chamber 22 in the powder coating operation of the powder coating system 1.
  • a venting line which preferably projects into the upper area of the powder chamber 22.
  • the protruding end of the vent line can protrude into a suction funnel of a suction system.
  • This extraction system can be designed, for example, as an air quantity booster (Air Mover).
  • An air flow intensifier also known as an air mover, works according to the Coanda effect and requires ordinary compressed air for its drive, which must be supplied in small quantities. This amount of air has a higher pressure than the ambient pressure.
  • the air flow intensifier creates a high velocity air flow in the intake funnel with high volume and low pressure. Therefore, an air quantity booster is particularly well suited in connection with the vent line or the fluidizing compressed air outlet 31.
  • the powder container 24 has a non-contact level sensor S1, S2 in order to detect the maximum permissible powder level in the powder chamber 22.
  • Powder chamber 22 preferably automatically feed fresh powder or Recoverypulver over the inlet opening of the at least one powder inlet 20-1, 20-2.
  • the level sensor S1, S2 for detecting the powder level in the powder chamber 22 is a non-contact level sensor and disposed outside the powder chamber 22 separately therefrom. This prevents contamination of the level sensor S1, S2.
  • the level sensor S1, S2 generates a signal when the powder level has reached a certain level.
  • a plurality of such powder level sensors S1, S2 may be arranged at different levels, for example for detecting predetermined maximum levels and for detecting a predetermined minimum level.
  • the signals of the at least one level sensor S1, S2 are preferably used to control an automatic powder feed of coating powder through the powder inlets 20-1, 20-2 into the powder chamber 22 to maintain therein a predetermined level or level even during the period the powder pumps 4 embodied here as single-chamber powder-tight istrumpumps 200 aspirate coating powder from the powder chamber 22 and convey it pneumatically to sprayers 40 (or in other containers).
  • the powder pumps 4 embodied here as single-chamber powder-tight istrumpumps 200 aspirate coating powder from the powder chamber 22 and convey it pneumatically to sprayers 40 (or in other containers).
  • Pulversprühbe Anlagen Restoration of cleaning compressed air is not or only with reduced pressure in the powder chamber 22 passed.
  • cleaning compressed air is supplied to the powder chamber 22 through the at least one cleaning compressed air inlet 32-1, 32-2.
  • the cleaning compressed air generated in the interior of the powder container 24, an air roller 35 which optionally dissolves on the inner wall of the powder container 24 adhering residual powder and expels it by the
  • the air pressure measured in the powder chamber 22 to be supplied to a control unit 3 continuously or at predetermined times or events, preferably automatically the quantity of fluidizing compressed air supplied per unit time of the powder chamber 22 and / or the quantity the per unit time from the powder chamber 22 via the at least one Fluidisierbuchausaus 31 discharged Fluidisierbuch Kunststoff be adjusted depending on the pressure prevailing in the powder chamber 22 air pressure / is.
  • the amount of cleaning compressed air supplied per unit time of the powder chamber 22 and / or the amount of cleaning compressed air discharged per unit time over the at least one Restpulverauslass 33 depending on the in the powder chamber 22nd prevailing air pressure is preferably set automatically / will.
  • a powder outlet 25 is provided which can be opened by means of a pinch valve 21, if necessary, preferably by gravity to remove coating powder from the powder chamber 22. This is particularly necessary if in a color or powder change still coating powder of the old variety in the powder chamber 22 is present.
  • the powder chamber 22 has a polygonal inner configuration, in which the base surface and the side surfaces of the powder chamber 22 are connected to one another via edges, in particular rectangular edges.
  • This angular internal configuration of the powder chamber 22 ensures that in the cleaning operation of the powder coating system 1, the air roller 35 forming inside the powder chamber 22 does not build up a laminar, but turbulent boundary layer, which facilitates the removal of residual powder adhering to the inner wall of the powder container 24.
  • the powder chamber 22 In order to be able to form the most ideal air roller 35 in the interior of the powder container 24 during the cleaning operation of the powder coating system 1, it has been found in practice that it is preferred for the powder chamber 22 to have a height of 180 mm to 260 mm, preferably 200 mm to 240 mm, and more preferably 220 mm, wherein the powder chamber 22 has a width of 140 mm to 220 mm, preferably 160 mm to 200 mm, and more preferably 180 mm, and the powder chamber 22 has a length of 510 mm to 590 mm, preferably from 530 mm to 570 mm, and more preferably from 550 mm.
  • the at least one cleaning compressed air inlet 32 - 1, 32 - 2 and the at least one residual powder outlet 33 should furthermore be provided in a common end wall 24 - 3 of the powder container 24.
  • Powder supply device shown further comprises at least one powder dispenser to promote coating powder by means of one, preferably a plurality of powder pumps 4 via powder tubes 38 to spray devices 40 and spray through the latter on an object to be coated 2.
  • 24 corresponding powder discharge openings 36 are provided in the chamber walls 24-4 and 24-5 of the powder container.
  • each of the powder discharge openings 36 is fluidly connected to an associated powder pump 4 in the powder coating operation of the powder coating system 1 aspirate coating powder from the powder chamber 22 and to be able to supply the spray devices 40.
  • the powder discharge openings 36 have an elliptical shape, so that the effective area for sucking fluidized coating powder is increased.
  • the powder discharge openings 36 are arranged as low as possible in the powder chamber 22 in order to be able to aspirate as much as possible of the coating powder from the powder chamber 22 by means of the powder pumps 4 embodied here as single-chamber powder-tight istrumpumps 200.
  • the powder pumps 4 are preferably located at a location higher than the highest powder level and are each via a (in the FIGS. 2a and 2b dashed lines shown) powder discharge channel 13 connected to one of the powder discharge openings 36.
  • the powder pumps 4 which are designed as single-chamber powder-tight istrumpumps 200, higher than the maximum powder level, it is avoided that the coating powder rises from the powder chamber 22 into the powder pumps 4 embodied as single-chamber powder-tight istrumpumps 200, when the powder pumps 4 are not turned on.
  • the powder discharge channel 13 may, for example, in a projecting into the powder chamber 22 dip tube or - as in the embodiment according to the FIGS. 2a and 2b provided - in a side wall 24-4, 24-5 of the powder container 24 may be formed.
  • At least one powder pump 4 is provided on the side wall 24-5 of the powder container 24.
  • This is in particular designed as a single-chamber powder seal pump 200, which is used to convey the coating powder has only a single powder delivery chamber 204.
  • the coating powder is sucked out of the powder chamber 22 by means of negative pressure, which is temporarily applied to the powder delivery chamber 204 (suction phase).
  • the sucked coating powder is forced out of the powder delivery chamber 204 by applying an overpressure on the powder delivery chamber 204 in the direction of a powder spray device.
  • the powder pump 4 formed as a single-chamber powder sealant pump 200 is attached to the upper end portion of the powder container 24 and detachably connected to the powder discharge passage 13.
  • the powder discharge channel 13 extends in particular through the side wall 24-5 of the powder container 24 and opens into the powder chamber 22 via a preferably elliptical powder discharge opening 36.
  • FIG. 4 An enlarged partial sectional view of the in Fig. 2b shown powder supply device is in Fig. 4 shown. It can be seen that the powder discharge channel 13 extends obliquely upward from the powder discharge opening 36 to the upper end region of the side wall 24-5 of the powder container 24. At the upper end region of the side wall 24-5, ie at the upper end region of the powder container 24, a Ansaugrohrstutzen 90 is provided for mounting the Pulverdichtstrompumpe 100, which is connectable to the powder discharge channel 13.
  • the intake manifold 90 is inserted into a preferably cylindrical recess 13-1.
  • the Ansaugrohrstutzen 90 is accordingly complementary formed to be 13 in the cylindrical recess 13-1 of the powder discharge channel 13 can be introduced.
  • the suction pipe stub 90 may be fixed to the upper end portion of the powder discharge passage 13 by another fixing member 95 (eg, threaded pin) inserted into the side wall 24-5 of the powder container 24.
  • the fastening element can, for example, engage in a recess of the intake pipe connecting piece 90 provided for this purpose.
  • the intake manifold 90 may be used to connect the powder pump 4 formed as a powder seal pump 200 to the side wall 24-5 of the powder container 24.
  • the powder supply device further comprises in the FIGS. 3a to 4 shown intake pipe 100, which is connectable to a through hole 91 of the intake manifold 90.
  • the through-bore 91 of the Ansaugrohrstutzens 90 have an internal thread into which the intake pipe 100 is screwed by means of an external thread 101 in the Ansaugrohrstutzen 91.
  • the intake pipe 100 is in particular designed such that it can be introduced into the powder discharge channel 13.
  • the intake pipe 100 in detail an outer diameter, which substantially corresponds to the inner diameter of the powder discharge channel 13.
  • the inner diameter of the intake pipe 100 is in particular in a range of 3 mm to 10 mm, preferably in a range of 5 mm to 8 mm, and more preferably this is about 4 mm.
  • a funnel portion 103 On a side facing away from the intake manifold 90 end portion 102 of the intake pipe 100, a funnel portion 103 is provided which has an expanded inner diameter.
  • the funnel region 103 prevents powder residues of the coating powder located in the powder chamber 22 from settling at the lower end region of the intake tube 100.
  • the intake pipe 100 has a length substantially equal to the length of the powder passage.
  • the powder channel 13 in particular obliquely opens into the powder chamber 22, so that the intake pipe 100 extends straight to the upper end of the powder discharge opening 36, so that the intake pipe 100 does not penetrate into the powder chamber 22.
  • the powder discharge channel 13 has a lower end region, via which the powder discharge channel 13 opens into the powder chamber 22 via a powder discharge opening 36 and an upper end region, to which the intake pipe connection 90 is attached and attachable.
  • the upper end region of the powder discharge channel 13 is arranged, in particular, on an upper end region of the powder container 24, wherein the intake pipe connection 90 and the recess 13-1 are formed such that the intake manifold 90 protrudes beyond the upper end portion of the powder container 24.
  • the Ansaugrohrstutzen 91 forms an extension 92, via which the powder sealant pump 200 can be attached to the side wall 24-5 of the powder container 24.
  • the powder seal current pump 200 preferably has a connecting element 110, which is detachably attached to a first end region of the powder seal current pump 200 facing the intake pipe socket 90.
  • the connecting element 110 is detachably connected to the front end region of the powder seal current pump 4 via fastening elements (eg fastening screws).
  • the fasteners are received in horizontal through holes 114 in the embodiment shown here.
  • the connecting element 110 serves to produce a frictional connection between the intake manifold 90 and the powder seal pump 200.
  • the connecting element 110 may have a recess 112 on an end region facing the intake pipe stub 90, which recess is in particular made of Fig. 5 is apparent.
  • the recess 112 is configured to receive the protruding area, ie the extension 92 of the intake manifold 90.
  • 90 may be provided in the extension 92 of the Ansaugrohrstutzens openings 94, which are aligned when connecting the connecting member 110 with the Ansaugrohrstutzen 90 with vertical through holes 114 of the connecting element 110.
  • additional fastening elements 116 eg fastening screws
  • Fig. 3c is the attached via the connecting element 110 to the intake manifold 90 and designed as a powder seal pump 200 powder pump 4 in a sectional view along in in Fig. 3b indicated section axis AA shown.
  • the connecting element 110 has a powder channel 111 which a powder channel of the intake pipe 100 with a Powder channel of the powder seal pump 200 connects.
  • the powder channel 111 of the connecting element 110 is designed angled, so that a connection of the substantially vertical intake pipe 100 is made possible with a substantially horizontal powder channel of the powder sealant pump 200.
  • the powder pump 4 embodied as a powder sealant pump 200 has a powder inlet 201 connected or connectable to the powder discharge channel 13, which at the same time forms a front end region of the powder channel of the powder sealant pump 200.
  • a powder outlet 202 connected or connectable to an output-side powder reservoir (not shown) or to a device for spraying the coating powder (not shown) is provided.
  • the powder inlet 201 is disposed at a first end portion of the powder seal current pump 200, and the powder outlet 202 is disposed at an opposite second end portion of the powder seal current pump 200.
  • the powder inlet 201 and the powder outlet 202 there is the already mentioned single powder feed chamber 204 of the powder seal pump 200, which is designed to alternately suck in powder from the powder chamber 22 and convey it in the direction of the powder outlet 202.
  • the powder delivery chamber 204 has a chamber inlet 205 at a first end region and a chamber outlet 206 at an opposite second end region.
  • a powder inlet valve 208 is also provided at the chamber inlet 205, via which the chamber inlet 205 of the powder feed chamber 204 is fluidly connected or connectable to the powder inlet 201 of the powder seal current pump 200.
  • a powder outlet valve 210 is provided, via which the single powder feed chamber 204 is fluidly connected or connectable to the powder outlet 202 powder seal pump 200.
  • the powder discharge valve 210 is not disposed directly between the chamber exit 206 of the powder delivery chamber 204 and the powder outlet 202 of the powder sealant pump 200; rather, between the powder outlet valve 210 and the powder outlet 202 of the powder seal current pump 200 is still an additional compressed air inlet device 220 arranged. As will be described later, this auxiliary compressed air inlet device 220 serves to inject additional transport compressed air as required into the powder path between the powder outlet valve 210 and the powder outlet 202 of the powder sealant pump 200.
  • auxiliary compressed air inlet device 220 it is not absolutely necessary to arrange the auxiliary compressed air inlet device 220 between the powder outlet valve 210 and the powder outlet 202 of the powder seal current pump 200.
  • the effects achievable with the additional compressed air inlet device 220 can also be realized if the additional compressed air inlet device 9 is arranged behind the powder outlet 202 of the powder seal current pump 1.
  • the powder seal pump 200 of the present invention it may be provided that between the auxiliary compressed air inlet device 220 and the powder outlet 202 of the powder seal pump 200, another valve is provided which then performs the function of the powder outlet valve.
  • powder inlet and powder outlet valves 208, 210 are designed as pinch valves.
  • these each have a flexible, elastic hose 212 which can be squeezed together to close the corresponding valve 208, 210 by means of actuating compressed air in a pressure chamber 214 surrounding the hose.
  • an air exchange opening 216 is provided in each pressure chamber 214, which is connected to a corresponding control valve 300 of a control device.
  • the control valves serve to pressurize alternately the pressure chambers 214 of the two powder inlet or powder outlet valves 208, 210, each designed as a pinch valve, with excess pressure from a compressed air supply line.
  • the flexible, elastic hose 212 of the powder inlet valve 208 or powder outlet valve 210 designed as a pinch valve preferably has such an elasticity or internal stress that it automatically stretches again after the pressure of the actuating compressed air in the pressure chamber 214 has ceased, thereby opening the corresponding valve channel.
  • a negative pressure at the pressure chamber 214 is applied via the corresponding air exchange openings 216.
  • an auxiliary compressed air inlet device 220 is provided at the exit of the powder outlet valve 210 or powder outlet 202 of the powder sealant pump 200 is provided, where necessary, to be able to feed additional transport compressed air into the powder path.
  • the additional compressed air of the additional compressed air inlet device 220 is pulsed with a pulse frequency which is equal to or preferably greater than the frequency of the powder feed chamber 204, with which the powder feed chamber 204 pumps powdered portions.
  • a pulsating compressed air or a pneumatic pulse generator for the auxiliary compressed air inlet device 220 may be provided which is connected via an air exchange opening 222 of the auxiliary compressed air inlet device 220.
  • a control device 300 is further mounted, which serves to drive the individual elements of the powder seal pump 200.
  • the control device 300 has a plurality of pressure or control air connections 301, 302, 303 and 304.
  • the powder supply device 1 comprises a plurality of single-chamber powder seal pumps 200 which are each connected to a powder discharge channel 13 of the powder chamber 22 or connectable.
  • the powder discharge channels 13 of the plurality of powder seal pumps 200 are preferably formed in the two opposite side walls 24-4 and 24-5 of the powder chamber 22. According to the concrete embodiment of the Fig. 2a Accordingly, each 12 powder seal pumps 200 would be connected to the powder channels 13 of the side walls 24-4 and 24-5.
  • the single-chamber design used in the powder sealant pump 200 of the powder supply device 1 according to the invention has a particularly compact construction.
  • the single-chamber powder seal pump 200 may have a width of only 40 mm, whereby a plurality of the powder seal pumps 200 may be attached to the sidewalls 24-4 and 24-5 of the powder container 24.
  • the at least one powder seal pump 200 is preferably arranged next to the powder container 24 such that a side surface 310 of the powder seal pump 200 facing the powder container 24 bears flat against an outer surface of the side wall 24-5 of the powder container 24.
  • the powder sealant pump 200 is accordingly suspended via the connecting element 110 on the intake manifold 90 and at the same time supported over the outer surface of the side wall 24-5 in order to effectively compensate for the torque forces caused by the weight of the powder seal pump 200.
  • support members 320 may be vorgeh Hughes In addition, in Fig. 4 shown that below the control device 300 of the powder sealant pump 200 support members 320 may be vorgeh Hughes Incorporate Blue to even better distribute the weight of the powder sealant pump 200.
  • the support members 320 may be provided on its upper side with elastic elements so as not to damage the housing of the powder seal pump 200.
  • the at least one powder sealant pump 200 according to the powder supply device according to the invention is arranged relative to the powder chamber 22 at a height which essentially corresponds to the powder level which can be set in the powder chamber 22.
  • the powder seal current pump 200 is preferably arranged at a level with the powder level within the powder chamber 22.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Nozzles (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Air Transport Of Granular Materials (AREA)
EP14752645.3A 2013-09-12 2014-08-19 Pulverversorgung mittels einer dichtstrompumpe für eine beschichtungsanlage Active EP3043923B1 (de)

Applications Claiming Priority (2)

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DE102013218326.7A DE102013218326A1 (de) 2013-09-12 2013-09-12 Pulverversorgungsvorrichtung für eine Pulverbeschichtungsanlage
PCT/EP2014/067649 WO2015036205A1 (de) 2013-09-12 2014-08-19 Pulverversorgung mittels einer dichtstrompumpe für eine beschichtungsanlage

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EP3043923B1 true EP3043923B1 (de) 2019-03-06

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CN (1) CN105705248B (pt)
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US9815074B2 (en) 2017-11-14
BR112016005333B1 (pt) 2021-06-22
CN105705248A (zh) 2016-06-22
CN105705248B (zh) 2018-09-11
WO2015036205A1 (de) 2015-03-19
DE102013218326A1 (de) 2015-03-12
EP3043923A1 (de) 2016-07-20
TR201907677T4 (tr) 2019-06-21
US20160221013A1 (en) 2016-08-04

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