EP3552713B1 - Centre d'alimentation en poudre destiné à l'alimentation d'une installation de revêtement par poudre et procédé de nettoyage du centre d'alimentation en poudre - Google Patents

Centre d'alimentation en poudre destiné à l'alimentation d'une installation de revêtement par poudre et procédé de nettoyage du centre d'alimentation en poudre Download PDF

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Publication number
EP3552713B1
EP3552713B1 EP18167062.1A EP18167062A EP3552713B1 EP 3552713 B1 EP3552713 B1 EP 3552713B1 EP 18167062 A EP18167062 A EP 18167062A EP 3552713 B1 EP3552713 B1 EP 3552713B1
Authority
EP
European Patent Office
Prior art keywords
powder
cleaning
container
storage container
center according
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
EP18167062.1A
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German (de)
English (en)
Other versions
EP3552713A1 (fr
Inventor
Gilbert Lutz
Roman Schmid
René Schmid
Michael Dietsche
Rolf Mazenauer
Michael Topp
Patrik Studerus
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.)
Wagner International AG
Original Assignee
Wagner International AG
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
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Application filed by Wagner International AG filed Critical Wagner International AG
Priority to PL18167062T priority Critical patent/PL3552713T3/pl
Priority to EP18167062.1A priority patent/EP3552713B1/fr
Priority to CN201910287901.6A priority patent/CN110369172B/zh
Priority to US16/381,758 priority patent/US11224891B2/en
Publication of EP3552713A1 publication Critical patent/EP3552713A1/fr
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Publication of EP3552713B1 publication Critical patent/EP3552713B1/fr
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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
    • B05B14/10—Arrangements for collecting, re-using or eliminating excess spraying material the excess material being particulate
    • 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
    • B05B7/1463—Arrangements for supplying particulate material the means for supplying particulate material comprising a gas inlet for pressurising or avoiding depressurisation of a powder container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
    • B05B15/555—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids discharged by cleaning nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1683—Arrangements for supplying liquids or other fluent material specially adapted for particulate materials
    • 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
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities

Definitions

  • Powder center for supplying a powder coating system with coating powder and a process for cleaning the powder center
  • the invention relates to a powder center for supplying a powder coating system with coating powder and a method for cleaning the powder center.
  • the powder is sprayed onto the workpiece to be coated using one or more powder applicators.
  • the powder-coated workpiece is then heated so that the powder melts. After the workpiece has cooled down, the powder forms a hard, closed top layer on the workpiece.
  • the workpieces to be coated are usually located within a powder coating booth, which is also referred to below as a booth or coating booth for short.
  • the powder applicators are supplied with coating powder via a powder center.
  • the coating process is interrupted and a so-called powder change made.
  • powder change made.
  • manual cleaning can take some time. During the cleaning process, the system is not available for coating workpieces. This has a negative effect on production costs.
  • Another disadvantage of manual cleaning is that staff run the risk of inhaling powder particles during cleaning. Furthermore, it must be ensured that the cleaning is carried out thoroughly. If, for example, the powder center is not adequately cleaned, undesirable color carryover can occur after a color change.
  • the supply device has a powder storage container with a lid, a suction tube and several powder conveyors in order to convey powder out of the powder storage container.
  • the powder storage container can be moved vertically up and down together with the suction tube.
  • the powder feeders are arranged in a stationary manner and protrude from above through openings in the suction tube and in the cover of the powder storage container. If Now the suction is activated and the powder storage container moves along with the suction tube along the powder conveyors, these are cleaned automatically. The powder storage container and its lid are not cleaned automatically, but have to be cleaned manually.
  • the powder supply device contains a powder container that can be closed with a lid and a cleaning device for removing residual powder from the powder container.
  • the lid cannot be cleaned automatically, but must be cleaned manually.
  • One object of the invention is to provide a powder center for supplying a powder coating installation with coating powder and a method for cleaning the powder center in which the powder center can be cleaned fully automatically.
  • the powder center is advantageously cleaned extremely cleanly.
  • the automatic cleaning can include one or more of the components of the powder center, such as the powder container, the lid of the powder container, the powder conveyor (s) and / or the ultrasonic sieve.
  • the powder center according to the invention for supplying a powder coating installation with coating powder comprises a powder storage container and a powder conveyor in order to transport powder from the powder storage container in the direction of the powder coating installation. It also includes Powder center a container lid which covers the powder storage container during the powder supply and which can be completely or partially removed for the purpose of cleaning the powder storage container. Furthermore, a cleaning unit for cleaning the powder storage container is provided, which can be moved by means of a manipulator from a parking position next to the powder storage container into a cleaning position in the powder storage container.
  • the powder center also has a control with which the powder conveyor, the cleaning unit and the manipulator can be controlled.
  • the object is also achieved by a method for cleaning the powder center with the features specified in claim 19.
  • the powder storage container and the container lid are cleaned with the cleaning unit.
  • a change to a different coating powder or a cleaning agent is carried out.
  • the production mode is switched to for a limited period.
  • the powder storage container and the container lid are then cleaned again with the cleaning unit.
  • the cleaning unit has compressed air nozzles for blowing off the powder storage container and the lid. This means that the powder storage container and the lid can be cleaned in an energy-efficient manner.
  • some of the compressed air nozzles are arranged on a first cleaning arm and some of the compressed air nozzles are arranged on a second cleaning arm.
  • the first cleaning arm is used to clean the lid and the second cleaning arm is used to clean the powder storage container.
  • the first cleaning arm and the second cleaning arm are rotatably mounted.
  • the first cleaning arm has a brush and / or a suction device.
  • the second cleaning arm can also have a brush and / or a suction device.
  • the cleaning unit has a cleaning container which carries the first cleaning arm and / or the second cleaning arm.
  • the cleaning arm can be positioned in the powder storage container.
  • the manipulator has a linear axis for moving the cleaning unit.
  • the manipulator can be a robot.
  • powder feeders and a coupling with a first group of connections and a second group of connections are advantageously provided.
  • the control can be used to set which connection of the first group is connected to which connection of the second group.
  • the output of the powder feeders is connected to one of the connections of the first group.
  • a powder conveyor can be arranged above the container cover, with which the coating powder can be conveyed into the powder storage container.
  • a powder outlet for residual powder and a further powder conveyor are provided in the bottom of the powder storage container. With the additional powder conveyor, the remaining powder can be sucked out of the powder storage container through the powder outlet and fed to a powder container.
  • a further manipulator is provided in order to be able to remove the container cover from the powder storage container.
  • the cleaning unit has a container lid cleaning device for cleaning the container lid, the container lid cleaning device carrying the first cleaning arm.
  • the powder storage container of the powder center according to the invention advantageously has a round cross section.
  • the powder center according to the invention can comprise a sieve and a sieve cleaning device for cleaning the sieve.
  • the sieve can be moved from a working position in the powder storage container into a cleaning position in the sieve cleaning device by means of an additional manipulator.
  • the screen cleaning device can have an upper cleaning arm with compressed air nozzles and a lower cleaning arm with compressed air nozzles.
  • the sieve is located between the upper cleaning arm and the lower cleaning arm during cleaning.
  • the screen cleaning device has a cleaning container with an openable cover.
  • the upper cleaning arm is rotatably mounted on the cover, and the lower cleaning arm is rotatably mounted on the cleaning container.
  • an extraction system is provided in order to extract the powder-air mixture generated by the cleaning unit.
  • the powder center 1 which is also referred to as a powder supply device, powder center or integrated powder management system, comprises a powder storage container 3, which is used to store the coating powder.
  • the powder center 1 comprises a powder conveying device with which the powder is conveyed out of the powder storage container 3 and transported to a powder applicator 80.
  • the powder conveying device is integrated into the powder storage container 3 and will be explained in more detail later.
  • the powder applicator 80 (see Figure 14 ) can be designed as a manual or automatic powder spraying device and has a spray nozzle or a rotary atomizer at its outlet directed towards the workpiece 65.
  • the powder center 1 is designed as a module. As a result, the powder center 1 can be transported quickly and easily as a compact unit.
  • the individual components of the powder center 1 are attached to frame profiles 2, which can be made of aluminum or steel, for example.
  • the frame profiles 2 form the outer boundary of the powder center 1. If necessary, the powder center 1 can have a base 7.
  • the powder storage container 3 of the powder center 1 can be arranged on a base 6, for example. As in Figure 6 shown, the powder storage container 3 can be closed with a powder container lid 23 during the conveying operation. Both Figure 6 The embodiment shown, the powder container lid 23 has the shape of an inverted pot. With the aid of pneumatic locks 18, the powder container lid 23 can be connected to the powder storage container 3 are sealed tight. For this purpose, the powder storage container 3 has seals and locking receptacles 3.1 into which correspondingly designed counterparts of the pneumatic lock 18 can engage.
  • the pneumatic lock 18 can for example be equipped with a cylinder, a piston and a piston rod. When the lower chamber of the cylinder is pressurized with compressed air, the piston and thus also the piston rod are pushed upwards.
  • the claw located at the lower end of the piston rod engages in the locking receptacle 3.1 and causes the powder container cover 23 to be pressed onto the powder storage container 3.
  • a sieve 24 which can be designed as an ultrasonic sieve.
  • the ultrasonic transducer 24.1 of the sieve 24 is preferably located outside the powder storage container 3. If the powder container cover 23 is removed, the sieve 24 is accessible and can be removed. So that this can happen automatically, the ultrasonic sieve 24 is attached to a pivot mechanism 16 via a support arm 22.
  • the sieve 24 can be moved out of the working position using the swivel mechanism 16 (see Figure 3 ) are pivoted out and brought into a cleaning position in a cleaning station 27 (see Figure 9 ).
  • the cleaning station 27 is also referred to below as a sieve cleaning station.
  • a rotatably mounted cleaning arm 20 is located inside the cleaning station 27.
  • the cleaning arm 20 has a plurality of cleaning nozzles 20. 1 which are arranged on the upper side of the cleaning arm 20.
  • the cleaning station 27 also includes a cover 15 which can be opened and closed with the aid of a pneumatic cylinder 17, for example.
  • the cover 15 is pivoted about a hinge 21.
  • a curved double arrow indicates the pivoting movement.
  • the cover 15 On its underside, the cover 15 carries a cleaning arm 19, which is also equipped with a large number of cleaning nozzles 19.1.
  • the cleaning nozzles 19.1 are preferably located on the underside of the cleaning arm 19.
  • the ultrasonic sieve 24 is located between the lower cleaning arm 20 and the upper cleaning arm 19.
  • the cleaning arm 19 can be attached at both ends (as in Figure 5 shown) angled so that it has one horizontal leg and two upward sloping legs.
  • the compressed air nozzles 19.1 can be located both on the horizontal limb and on the limbs which are directed obliquely upward.
  • the cleaning arm 19 can be designed as a tube in order to lead the compressed air inside the tube to the compressed air nozzles 19.1. The same applies analogously to the lower cleaning arm 20, even if in Figure 5 the ends of the lower cleaning arm 20 are not angled.
  • the powder-air mixture located in the cleaning station 27 can be sucked off via the outlet 14.1.
  • the outlet 14.1 is connected to an inlet opening 13.2 of a suction pipe 13 via a hose not shown in the figures.
  • the powder-air mixture can be sucked into a post-filter 100 via the suction pipe 13 and a suction line 91.
  • the powder storage container 3 and its powder container cover 23 are also referred to below as working containers 3, 23.
  • the powder inlet 23.1 of the working container 3, 23 is preferably located in its upper area. It can, for example, be arranged in the powder container cover 23 of the working container 3, 23.
  • the working container 3, 23 can additionally have further powder inlets.
  • the powder inlet 23.1 is connected to the powder outlet 4.2 of an intermediate container 4 via a powder valve M21, which is designed, for example, as a pneumatically controlled squeezer.
  • the intermediate container 4 serves as a powder conveyor and is generally arranged above the working container 3, 23. In this way, the force of gravity can be used to transport powder located in the intermediate container 4 down into the working container 3, 23.
  • a second powder conveyor 5 can be arranged above the working container 3, 23. Its powder outlet also opens into the working container 3, 23.
  • the powder feed device integrated in the powder storage container 3 is explained in more detail below.
  • the powder feed device can, as in the European patent application EP 3 238 832 A1 described, be formed.
  • the working container 3, 23 is designed and operable in such a way that it can be placed under pressure. With the aid of the powder conveyor 4, powder can be conveyed out of the fresh powder station 30 and transported into the working container 3, 23.
  • a corresponding powder inlet is provided in the powder container lid 23, which covers the powder storage container 3 at the top.
  • the working container 3, 23 has a fluidizing insert 25.1 for fluidizing the powder and a series of powder outlets 3.2 in the area of the container bottom 25. It can be provided that a powder outlet valve G1-G36 is connected to each of the powder outlets 3.2.
  • a powder line 81 is in turn connected to each of the powder outlet valves G1-G36.
  • Each of the powder lines 81 also has an inlet for transport air on the inlet side, that is to say in the vicinity of the respective powder outlet valve G1-G36.
  • On the output side each of the powder lines 81 is preferably connected to one of the powder applicators 80 via a coupling 130.
  • the amount of powder to be conveyed is controlled by repeatedly opening and closing the respective powder outlet valve G1-G36 by means of a controller 70.
  • a controller 70 please refer to the above-mentioned patent application EP 3 238 832 A1 referenced, the content of which is hereby part of the present application.
  • a vibrator 220 is provided, which can be located, for example, below the powder storage container 3 (see FIG Figure 6 ). With the help of the shaking movements generated by the vibrator 220, the powder-air mixture in the powder storage container 3 can be fluidized even more evenly. In addition, the powder-air mixture can flow out of the powder outlet channel 203 even more optimally.
  • the coupling 130 has a first group of connections 131 and a second group of connections 132.
  • the controller 70 can be used to set which connection of the first group 131 is connected to which connection of the second group 132.
  • one of the powder lines 81 can be connected on the output side to a respective connection of the first group 131.
  • a powder line which on the other hand is connected to one of the powder applicators 80, can be connected to each connection of the second group 132.
  • 36 powder outlet valves G1-G36 are used. However, a greater or lesser number of powder outlet valves can also be used. The number of powder outlet valves used depends on the number of powder applicators 80 used.
  • a powder injector that works according to the Venturi principle or a powder pump for dense phase conveyance can also be provided.
  • a powder pump for dense phase conveyance a hose pump or a powder injector can also be provided.
  • a powder outlet 25.2 which is connected to the outlet 3.3 of the storage container 3 via a valve M11. Residual powder that is still in the powder storage container 3 can be transported back to the fresh powder station 3 with the aid of a powder conveyor 49 via the outlet 3.3. To this end, the powder conveyor 49 can be connected to the outlet 3.3 of the storage container 3 via a hose not shown in the figures.
  • the powder storage container 3 and its powder container lid 23 as well as the two powder conveyors 4 and 5 are attached to a vertical linear axis 12, which is also referred to as a linear lifting device, and can thus be moved up and down.
  • the drive 12.1 of the linear axis 12 can be located at the top of the linear axis 12.
  • the vertical double arrow in Figure 6 indicates its direction of movement.
  • the powder center 1 also comprises a container cleaning unit 28 or, in short, a cleaning unit, which comprises a cleaning container 10, an upper cleaning arm 11 and a lower cleaning arm 26.
  • the upper cleaning arm 11 and the lower cleaning arm 26 are rotatably mounted in the cleaning container 10 and each have a plurality of cleaning nozzles 11.1 and 26.1 operated with compressed air.
  • the cleaning container 10 is attached to a linear lifting device 9 and can be moved vertically up and down (in the y direction) with this.
  • the vertical double arrow in Figure 1 indicates its direction of movement.
  • the drive 9.1 of the linear lifting device 9 can be located at the top of the linear lifting device 9.
  • the linear lifting device 9 is in turn fastened to a horizontally aligned linear drive 8 (also called a linear axis) and can be moved back and forth horizontally (in the x direction) with it.
  • the drive 8.1 of the linear axis 8 can be arranged on the side of the linear axis 8. With the linear axis 8 it is possible to position the container cleaning unit 28 laterally next to the working container 3, 23 during the conveying operation (see FIG Figures 1 to 4 ).
  • the container lid 23 is first moved upwards; Then the container cleaning unit 28 can be positioned with the aid of the two linear drives 8 and 9 in such a way that the cleaning container 10 is first brought over the powder storage container 3 and then lowered so far that the cleaning arm 26 is at a defined distance from the floor 25 of the powder storage container 3 having.
  • the cleaning arm 26 protruding from the bottom of the cleaning container 10 is then located in the interior of the powder storage container 3 and serves to clean the inner wall and the bottom 25 of the powder storage container 3.
  • the powder container lid 23 can be lowered so far that the inside surfaces of the powder container lid 23 can be blown off and thus cleaned with the cleaning arm 11 protruding from the cleaning container 10.
  • the cleaning arm 11 protrudes into the interior of the powder container lid 23.
  • a possible embodiment of the fresh powder station 30 is shown in Figures 10 to 13 shown in different views.
  • the fresh powder station 30 can, for example, be designed as an independent module. It comprises a first storage surface 31 and a second storage surface 32, each of which has a powder carton 110, 111 (see Figure 15 ) be able to record.
  • the two storage surfaces 31 and 32 are preferably arranged at an angle, so that the powder moves obliquely downwards into a corner in the powder carton with the assistance of gravity. In this way, the powder cardboard can be emptied completely or almost completely with the aid of a suction lance 33 without great effort.
  • the suction lance 33 is, as in Figures 12 and 13 shown, horizontally movable with the aid of a linear drive 44, so that it can be used both for a powder carton arranged on the first placement surface 31 and for a powder carton arranged on the second placement surface 32. Furthermore, the fresh powder station 30 has an additional linear drive 38 so that the suction lance 33 can also be moved vertically.
  • a vibrator 54 and a scale 46 are located below the floor space 31 for the powder carton 110.
  • the vibrator 54 is used to set the powder in the carton 110 in motion so that it is better distributed and flows in the direction of the suction lance 33.
  • the filling level in the carton 110 can be determined via the scales 46, and if the filling level falls below a certain level, the powder cartons can be changed.
  • the generated by the balance 46 can Measurement signal are recognized as to whether there is still enough space in the box 110 when powder is to be conveyed back to the powder station 30 via the line 96 from the powder center 1.
  • a vibrator 55 and a scale 47 are also located under the floor space 32. Their purpose corresponds, mutatis mutandis, to the same as the vibrator 54 and the scale 46 in the floor space 31.
  • the fresh powder station 30 additionally has a cleaning station 52 which is equipped with a scraper ring and / or compressed air nozzles and / or a suction device. In this way, the outside of the suction lance 33 can be freed of powder adhering there during the up and down movement.
  • air nozzles 57 can be attached to the cleaning station 53 in order to clean the lower area of the suction lance 33. If the suction lance has a fluidizing crown in order to fluidize the powder in the suction area, this can also be cleaned with it.
  • only one storage area 32 and a powder container 150 with a fluidizing device could also be installed.
  • two pumps 124 and 125 can be used to convey powder from a BigBag 121 into the powder container 150.
  • a BigBag 120 with a pump 123 can also be provided.
  • the Powder can be pumped from the pump 123 via a powder line 126 directly to the powder conveyor 4.
  • the BigBag 120 or 121 is also known as the Flexible Intermediate Bulk Container or FIBC for short. It usually contains larger amounts of powder than the powder carton 110 and the powder carton 111.
  • the BigBag 120/121 is also usually further away from the powder conveyor 4 than the powder carton 110 or 111 Example 30m to the powder conveyor 4, whereas the powder carton 110 or 111 is, for example, 5m away from the powder conveyor 4.
  • the fresh powder station 30 can have several compressed air control valves 39 and 40 and control buttons 41 and 42.
  • the compressed air control valve 39 can be provided for adjusting the fluid air of the fluid base of the powder container 150.
  • the compressed air control valve 40 is used to adjust the fluidizing air on the fluidizing crown of the suction lance 33.
  • the position of the exhaust air flap can be controlled with the aid of the adjusting knob 41.
  • a confirmation signal can be transmitted to the control via the setting button 42.
  • the fresh powder station 30 can have a suction 37 with a suction opening 37.1 in order to be able to suck off excess powder from the interior of the fresh powder station 30.
  • the fresh powder station 30 can also have a flexible suction hose which can be used for manual cleaning if necessary.
  • the fresh powder station 30 has a swivel mechanism 45 for the powder conveyor 49.
  • the pivot mechanism 45 has a drive, which can be designed as a pneumatic drive, for example, and a pivot arm 45.1.
  • the powder feeder 49 can be moved out of the conveying position (see FIG Fig. 10 ) can be brought into a cleaning position. In the cleaning position, the powder conveyor 49 protrudes into the interior of the fresh powder station 30.
  • air nozzles 56 can be provided to clean the lower area of the powder conveyor 49 when it is pivoted from the conveying position into the cleaning position or from the cleaning position into the conveying position.
  • the pneumatic drive can comprise two pneumatically driven cylinders.
  • the powder conveyor 49 can thus be brought into a cleaning position, a first conveying position and a second conveying position.
  • cylinder 1 and cylinder 2 are retracted.
  • the powder conveyor 49 is located above the placement surface 31.
  • cylinder 1 is retracted and cylinder 2 is extended.
  • the powder conveyor 49 is located above the placement surface 32; cylinders 1 and 2 are extended.
  • powder can be conveyed back into the powder box 110 and in the second conveying position powder can be conveyed back into the powder box 111.
  • the suction lance 33 can be brought into three different positions with the linear axis 38 and the linear drive 44: In the cleaning position (see Fig. 10 ) the suction lance 33 is located in the cleaning station 53. In the first conveying position, the suction lance 33 is above the placement surface 31 and in the second conveying position above the placement surface 32.
  • the fresh powder station 30 can also be equipped with its own controller 43. With the aid of this controller 43, for example, the suction lance 33, the cleaning station 52 for the suction lance 33, the linear axis 38, the linear drive 44, the pivoting mechanism 45 and the blow nozzles 56 and 57 can be controlled.
  • the powder conveyor 49 shown is advantageously positioned directly above the powder carton 110 or 111 into which it is to convey powder back. Since it uses gravity, the powder falls into the powder carton located under the powder conveyor 49 after the outlet valve of the powder conveyor 49 is opened.
  • the powder conveyor 49 shown for returning the powder can also be designed differently.
  • it can be designed as a powder pump. Since the force of gravity is not used in such a powder pump, it can be arranged at different locations. It can also be at the same level as the powder carton 110, for example.
  • the fresh powder station 30 can also be equipped with side walls 34 and a rear wall 48.
  • FIG Figure 14 A possible embodiment of an entire system for powder coating workpieces 65 is shown in FIG Figure 14 shown simplified in plan view.
  • the entire system can be controlled via a central controller 70.
  • the controller 70 can be connected to various components of the entire system via corresponding control lines 71 and provided to control the powder coating booth 60 including powder applicators 80, the fresh powder station 30, the powder center 1, the powder recovery 90 and the post-filter 100.
  • the fresh powder station 30 can have a separate controller 43. The same applies to all other components of the entire system for coating workpieces with powder.
  • the excess powder which is also referred to as overspray, must be removed again from the booth 60. On the one hand, this is necessary because the area outside the booth must be kept free of powder dust. On the other hand, the risk of explosion increases if a certain powder concentration is exceeded by the powder dust cloud floating in the cabin. This must be avoided.
  • the overspray occurring during the coating process is sucked out of the cabin 60 as a powder-air mixture together with the air in the cabin 60 and fed to a device for powder recovery 90 via a residual powder pipeline 92.
  • the device for powder recovery 90 can be designed as a cyclone, for example.
  • the powder recovered there can, if necessary, be fed back to the powder center 1 via a powder line 94.
  • the powder-air mixture can be fed from the cyclone to the post-filter 100 via a suction line 93.
  • the powder-air mixture in the residual powder pipeline 92 is also referred to as the residual powder air flow.
  • the booth 60 has, for example, a suction slot. It connects the interior of the cabin 60 with the residual powder pipeline 92. Excess powder is thus sucked out of the cabin interior as a powder-air mixture via the suction slot and the suction pipe 61 and fed to a cyclone separator 90 or, for short, a cyclone, which can be designed as a monocyclone.
  • the powder-air mixture flows tangentially into the cyclone 90 and spirally downwards in the cyclone.
  • the powder particles are pressed outward against the outer wall of the cyclone 90 by the centrifugal force that occurs during the rotation of the powder-air flow.
  • the powder particles are conveyed downwards in the direction of the powder outlet of the cyclone and collected there.
  • the air freed from the powder particles is sucked off via the vertical central pipe located in the cyclone 90.
  • the air stream cleaned in this way is often also fed to a post-filter 100 in order to also include that in the air filter out any remaining powder.
  • the powder recovered in the cyclone 90 can be used again for coating and fed to the powder center 1 via the powder line 94.
  • the ultrasonic sieve 24 is located in the working container 3, 23 between the powder storage container 3 and the powder container lid 23.
  • the locks 18 ensure that the working container is hermetically sealed.
  • the screen cleaning device 27 and the container cleaning unit 28 are located as in FIG Figures 1 to 4 shown in the park position.
  • the parking position for the container cleaning unit 28 is located next to the powder storage container 3.
  • the phrase “next to the powder storage container” also includes above, below, in front of or behind the powder storage container.
  • the sieve 24 is not absolutely necessary for the conveying operation.
  • the powder can also be conveyed without an ultrasonic sieve or entirely without a sieve 24.
  • the powder conveying from the powder storage container 3 is stopped and the remaining powder still in the powder storage container 3 is sucked off via the outlet 25.1.
  • the overpressure still prevailing in the working container 3, 23 is reduced to normal pressure and the locks 18 are opened.
  • the linear drive 12 lifts the container cover 23 so far that the cleaning container 10 can be moved between the powder container cover 23 and the powder storage container 3 with the aid of the two linear axes 8 and 9.
  • the container cleaning unit 28 with the cleaning container 10 is then lowered until the lower cleaning arm 26 is located inside the powder storage container 3 and is at a defined distance from the bottom 25 of the powder storage container 3.
  • the powder container lid 23 is now lowered until the upper cleaning arm 11 is inside the powder container lid 23 and is at a defined distance from the powder container lid 23.
  • an air gap remains between the powder container lid 23 and the cleaning container 10.
  • An air gap also remains between the powder container 3 and the cleaning container 10. Air is sucked in from the post-filter 100 via the air gap. This prevents the powder-air mixture generated by the compressed air nozzles 11.1 and 26.1 during the cleaning process from escaping into the environment.
  • the unit comprising the powder container cover 23, cleaning container 10 and powder storage container 3 can be sealed off in an airtight manner with the locks 18.
  • compressed air is blown through the nozzles 11.1 and 26.1 in the direction of the inner walls of the powder container lid 23 and of the powder storage container 3.
  • the resulting powder-air mixture is sucked off via the suction line 13 and can be fed to the cyclone 90 and / or the post-filter 100.
  • the cover 15 is closed with the aid of the pneumatic cylinder 17.
  • An air gap can remain between the cover 15 and the cleaning container 14.
  • the cover 15 can also be placed on the cleaning container 14 in an airtight manner.
  • Compressed air is now blown through the nozzles 19.1 and 20.1 onto the sieve 24 from above and below.
  • the resulting powder-air mixture is sucked off via the suction line 13 and can be fed to the cyclone 90 and / or the post-filter 100.
  • the following cleaning steps can be carried out.
  • the steps are preferably carried out automatically and coordinated by the controller 70.
  • the cleaning unit 28 the powder storage container 3 and the container lid 23 are cleaned as described above.
  • a change to a different coating powder is carried out.
  • the other coating powder can be the powder with which the workpieces 65 are to be coated next. However, this is not absolutely necessary. Instead, you can switch to a special cleaning agent.
  • the cleaning agent can, for example, contain granules a grain size between 2 mm and 7 mm.
  • the grain size, the grain material and the grain quality are preferably selected so that on the one hand they can be conveyed through all openings in the powder system and on the other hand they have a good cleaning effect.
  • the cleaning agent it is advantageous to ensure that no additional wear and tear occurs in the powder system and no chemical incompatibility with the coating powder occurs.
  • conveyor mode is switched to for a limited period so that the other coating powder or cleaning agent flows through the individual components of the system. For example, 3 kg of powder can be lost during the short conveyor operation.
  • the material the powder or the cleaning agent
  • the powder lines 91, 92, 93 and 94 can also be rinsed with the new material. This is particularly advantageous when the new powder is used for recovery.
  • the powder storage container 3 and the container lid 23 are then cleaned again with the aid of the cleaning unit 28.
  • the cleaning parameters such as the number and duration of the compressed air pulses to blow off the sieve 24, the number and duration of the compressed air pulses to blow off the container lid 23, number and duration of the compressed air pulses to blow off the powder container 3 and the air pressure used for the compressed air pulses, can be controlled by the control 70 can be specified and also changed.
  • the controller 70 can independently specify the cleaning parameters required for optimal cleaning. For example, you can take into account the type of powder and its color. It is also possible to provide the controller 70 with external information which is helpful for specifying the cleaning parameters. For example, a barcode or RFID tag attached to the powder box 110 or the BigBag 120 can be read out. The information received in the barcode or RFID tag can be evaluated by the controller 70 in order to set the cleaning parameters.
  • the container cleaning unit 28 comprises a first station for cleaning the powder container deck 23 and a second station for cleaning the powder storage container 3.
  • the first station can have a funnel-shaped container 200 which carries the lower cleaning arm 11.
  • the container lid 23 is on the powder storage container 3.
  • the container lid 23 When in cleaning mode (see Figures 20 to 23 ) is switched, the container lid 23 is lifted with the linear drive 12 and with a further linear drive 201 from the powder storage container 3 to the lid cleaning station transported. Then the container lid 23 is lowered with the linear drive 12 onto the funnel-shaped container 200 until the cleaning arm 11 is at a defined distance from the container lid 23.
  • the second station with the cleaning container 10 can be constructed as in the first embodiment.
  • the cleaning container 10 of the cleaning station 28 is raised with the linear drive 9 and positioned above the powder storage container 3 with the linear drive 8.
  • the cleaning container 10 is then lowered over the powder container 3, specifically until the cleaning arm 26 is at a defined distance from the floor 25 of the powder storage container 3.
  • the individual components of the powder center 1 can also be based on another than in the Figures 1 to 13 shown way can be combined and arranged.
  • the arrangement of the powder center 1, the fresh powder station 30, the powder coating system 60, the control 70, the cyclone 90 and the post-filter 100 is also present not on the in Figure 14 shown arrangement limited. It is also possible that one or the other component can be added to the system.
  • the container lid 23 does not have to be completely separated from the container 3 for cleaning.
  • the cleaning unit 28 can be designed in such a way that it can be moved between the container 3 and the opened container lid 23 in order to then clean the container 3 and the container lid 23 from there.

Landscapes

  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)

Claims (19)

  1. Centre d'alimentation en poudre, destiné à alimenter une installation de poudrage en poudre de revêtement,
    - lequel présente un réservoir de poudre (3) avec un dispositif d'acheminement de poudre (3, 23, G1), permettant d'acheminer la poudre du réservoir de poudre (3) en direction de l'installation de poudrage (60),
    - lequel présente un couvercle de réservoir (23) qui couvre le réservoir de poudre (3) pendant l'acheminement de la poudre et qui peut être au moins partiellement enlevé à des fins de nettoyage du réservoir de poudre (3),
    - lequel présente une unité de nettoyage (28) permettant le nettoyage du réservoir de poudre (3) et du couvercle du réservoir (23), laquelle peut être déplacée d'une position de repos à côté du réservoir de poudre dans une position de nettoyage dans le réservoir de poudre au moyen d'un manipulateur (8, 9),
    - lequel présente une commande (70) permettant de piloter le dispositif d'acheminement de poudre (3, 23, G1), l'unité de nettoyage (28) et le manipulateur (8, 9).
  2. Centre d'alimentation en poudre conformément à la revendication 1,
    dans lequel l'unité de nettoyage (28) présente des buses d'air comprimé (11.1, 26.1) pour le soufflage du réservoir de poudre (3) et du couvercle du réservoir (23).
  3. Centre d'alimentation en poudre conformément à la revendication 2,
    - dans lequel une partie des buses d'air comprimé (11.1) est disposée sur un premier bras de nettoyage (11) et l'autre partie des buses d'air comprimé (26.1) sur un autre bras de nettoyage (26), et
    - dans lequel le premier bras de nettoyage (11) sert au nettoyage du couvercle (23) et le deuxième bras de nettoyage (26) au nettoyage du réservoir de poudre (3).
  4. Centre d'alimentation en poudre conformément à la revendication 3,
    dans lequel le premier bras de nettoyage (11) et le deuxième bras de nettoyage (26) sont pivotants.
  5. Centre d'alimentation en poudre conformément à la revendication 3 ou 4,
    dans lequel le premier bras de nettoyage (11) et/ou le deuxième bras de nettoyage (26) présente une brosse et/ou un dispositif d'aspiration.
  6. Centre d'alimentation en poudre conformément à l'une des revendications 3 à 5,
    dans lequel l'unité de nettoyage (28) présente un récipient de nettoyage (10)
    - qui supporte le premier bras de nettoyage (11) et/ou le deuxième bras de nettoyage (26) et
    - qui positionne le bras de nettoyage (26) dans le réservoir de poudre (3) pendant le cycle de nettoyage.
  7. Centre d'alimentation en poudre conformément à l'une des revendications 1 à 6,
    dans lequel le manipulateur (8, 9) présente un axe linéaire pour le déplacement de l'unité de nettoyage (28) .
  8. Centre d'alimentation en poudre conformément à l'une des revendications 1 à 7,
    dans lequel le manipulateur (8, 9) est un robot.
  9. Centre d'alimentation en poudre conformément à l'une des revendications 1 à 8,
    - dans lequel plusieurs dispositifs d'acheminement de poudre (3, 23, G1 - G36) sont prévus,
    - dans lequel un accouplement (130) avec un premier groupe de raccords (131) et un deuxième groupe de raccords (132) est prévu, permettant de définir, au moyen de la commande (70), quel raccord du premier groupe (131) est relié à quel raccord du deuxième groupe (132),
    - dans lequel les dispositifs d'acheminement de poudre (3, 23, G1 - G36) sont respectivement reliés à l'un des raccords du premier groupe (131) côté sortie.
  10. Centre d'alimentation en poudre conformément à l'une des revendications 1 à 9,
    dans lequel un dispositif d'acheminement de poudre (4; 5) disposé au-dessus du couvercle du réservoir (23), permet d'acheminer la poudre de revêtement dans le réservoir de poudre (3).
  11. Centre d'alimentation en poudre conformément à l'une des revendications 1 à 10,
    - dans lequel une sortie de poudre (25.2) pour la poudre résiduelle est prévue dans le fond (25) du réservoir de poudre (3),
    - dans lequel la poudre résiduelle peut être aspirée du réservoir de poudre (3) par la sortie de poudre (25.2) et acheminée à un récipient de poudre au moyen d'un autre dispositif d'acheminement de poudre (49) .
  12. Centre d'alimentation en poudre conformément à l'une des revendications 1 à 11,
    dans lequel un autre manipulateur (12, 201) est prévu pour pouvoir enlever le couvercle du réservoir (23) du réservoir de poudre (3).
  13. Centre d'alimentation en poudre conformément à l'une des revendications 1 à 12,
    dans lequel l'unité de nettoyage (28) présente un dispositif de nettoyage du couvercle du réservoir (200) pour le nettoyage du couvercle du réservoir (23), le dispositif de nettoyage du couvercle du réservoir (200) supportant le premier bras de nettoyage (11).
  14. Centre d'alimentation en poudre conformément à l'une des revendications 1 à 13,
    dans lequel le réservoir de poudre (3) présente une section ronde.
  15. Centre d'alimentation en poudre conformément à l'une des revendications 1 à 14,
    - dans lequel un tamis (24) et un dispositif de nettoyage du tamis (27) pour le nettoyage du tamis (24) sont prévus,
    - dans lequel le tamis (24) peut être déplacé d'une position de travail dans le réservoir de poudre dans une position de nettoyage dans le dispositif de nettoyage du tamis (27) au moyen d'un manipulateur (16) supplémentaire à des fins de nettoyage.
  16. Centre d'alimentation en poudre conformément à la revendication 15,
    - dans lequel le dispositif de nettoyage du tamis (27) présente un bras de nettoyage supérieur (19) avec buses d'air comprimé (19.1) et un bras de nettoyage inférieur (20) avec buses d'air comprimé (20.1) et
    - dans lequel le tamis (24) se trouve entre le bras de nettoyage supérieur (19) et le bras de nettoyage inférieur (20) pendant le nettoyage.
  17. Centre d'alimentation en poudre conformément à la revendication 15 ou 16,
    - dans lequel le dispositif de nettoyage du tamis (27) présente un récipient de nettoyage (14) avec un couvercle (15) pouvant être ouvert,
    - dans lequel le bras de nettoyage supérieur (19) sur le couvercle (15) est pivotant et
    - dans lequel le bras de nettoyage inférieur (20) sur le récipient de nettoyage (14) est pivotant.
  18. Centre d'alimentation en poudre conformément à l'une des revendications 1 à 17,
    dans lequel une aspiration (13) est prévue pour aspirer le mélange poudre-air généré par l'unité de nettoyage (28).
  19. Procédé de nettoyage d'un centre d'alimentation en poudre conformément à l'une des revendications 1 à 18,
    - dans lequel le réservoir de poudre (3) et le couvercle du réservoir (23) sont nettoyés au moyen de l'unité de nettoyage (28),
    - dans lequel un changement de poudre de revêtement ou de produit nettoyant est effectué,
    - dans lequel on bascule en mode d'acheminement pendant une durée limitée et
    - dans lequel le réservoir de poudre (3) et le couvercle du réservoir (23) sont ensuite nettoyés une nouvelle fois au moyen de l'unité de nettoyage (28).
EP18167062.1A 2018-04-12 2018-04-12 Centre d'alimentation en poudre destiné à l'alimentation d'une installation de revêtement par poudre et procédé de nettoyage du centre d'alimentation en poudre Active EP3552713B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PL18167062T PL3552713T3 (pl) 2018-04-12 2018-04-12 Centrum proszku do zaopatrywania w proszek powlekający urządzenia do powlekania proszkowego i sposób czyszczenia centrum proszku
EP18167062.1A EP3552713B1 (fr) 2018-04-12 2018-04-12 Centre d'alimentation en poudre destiné à l'alimentation d'une installation de revêtement par poudre et procédé de nettoyage du centre d'alimentation en poudre
CN201910287901.6A CN110369172B (zh) 2018-04-12 2019-04-11 用涂料粉末供给粉末涂覆设备的粉末中心和清洁粉末中心的方法
US16/381,758 US11224891B2 (en) 2018-04-12 2019-04-11 Powder center for supplying a powder coating facility with coating powder, and method for cleaning of the powder center

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18167062.1A EP3552713B1 (fr) 2018-04-12 2018-04-12 Centre d'alimentation en poudre destiné à l'alimentation d'une installation de revêtement par poudre et procédé de nettoyage du centre d'alimentation en poudre

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EP3552713A1 EP3552713A1 (fr) 2019-10-16
EP3552713B1 true EP3552713B1 (fr) 2021-02-17

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EP (1) EP3552713B1 (fr)
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CN111672648B (zh) * 2020-06-23 2021-04-23 萧县华恒静电科技有限公司 一种用于建筑装饰钢板的静电粉料喷涂机构及其工作方法

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Also Published As

Publication number Publication date
CN110369172B (zh) 2023-02-24
US11224891B2 (en) 2022-01-18
US20190314848A1 (en) 2019-10-17
EP3552713A1 (fr) 2019-10-16
PL3552713T3 (pl) 2021-07-05
CN110369172A (zh) 2019-10-25

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