EP2046504A1 - Powder pump with vacuum filling - Google Patents
Powder pump with vacuum fillingInfo
- Publication number
- EP2046504A1 EP2046504A1 EP07786134A EP07786134A EP2046504A1 EP 2046504 A1 EP2046504 A1 EP 2046504A1 EP 07786134 A EP07786134 A EP 07786134A EP 07786134 A EP07786134 A EP 07786134A EP 2046504 A1 EP2046504 A1 EP 2046504A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- powder
- pipe
- tank
- reservoir
- supply
- 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.)
- Granted
Links
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
-
- 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
Definitions
- the present invention relates to a powder supply equipment for a powder coating plant, in particular a parts painting installation using electrostatic powder, and a method of supplying powder to a powder coating plant.
- a powder coating plant equipped with powder sprayers, usually has a conveyor for scrolling the parts to be painted in front of sprayers.
- Each piece, according to its size and shape, requires appropriate adjustment of the powder flow rate projected by the sprayers.
- a powder supply equipment for such an installation is generally made on the principle of a venturi pump, with the effect of driving the powder by air.
- the amount of air important here implemented is detrimental to the performance of the powder deposit, that is to say the ratio between the amount of powder deposited and the amount of powder sprayed. Indeed, the air transport of the powder tends to blow the powder already deposited on the piece to be painted.
- a reservoir intended to contain powder, means for feeding powder into the reservoir,
- Such a type of equipment known in particular documents EP1454675 and FR2872067, makes it possible to more easily control the rate of powder applied and to reduce the amount of air used, which in particular reduces the blowing effect.
- the mixing speed is lower in the equipment, which prevents the powder from melting.
- the means for feeding the powder into the tank from a filling tank operate by gravity, or by using a pump to drive the powder, these means being associated with a valve.
- the present invention aims to solve this technical problem, that is to say to reduce the agglomerations of powder due to the supply means.
- the present invention relates to an equipment of the aforementioned type, characterized in that the equipment comprises means for depressurizing the reservoir relative to the supply means for filling the reservoir with powder.
- the valve does not stress the powder, which prevents the formation of agglomerates.
- the feed means comprise a powder supply duct and a powder supply valve intended to close this duct, the powder supply valve being associated with cleaning means of the valve when it is open.
- the supply duct comprises at least one substantially horizontal section at which the powder supply valve is disposed.
- the means for depressurizing the reservoir relative to the supply means comprise a venturi device, associated with means for separating the air and the powder.
- the means for separating the powder and the air comprise a cyclone.
- the means for separating the powder and the air comprise a filter.
- the means for depressurizing the reservoir relative to the supply means comprise a valve for cutting the air flow downstream of the depression means.
- the compressed air injection means comprise a blowing nozzle, effecting a fluidization of the powder, located opposite the end of the pipe during spraying.
- a blowing nozzle effecting a fluidization of the powder, located opposite the end of the pipe during spraying.
- These arrangements allow local fluidization of the powder at the end of the pipe.
- the powdering rate in the outlet pipe is increased, this powdering flow having a better homogeneity compared to the devices of the prior art. It is thus possible to increase the pressure in the tank to increase the flow rate while maintaining a fluidized powder supply in a homogeneous manner.
- the equipment comprises means for moving the powder starting pipe between a first position in which the powder present in the reservoir can penetrate the pipe, and a second cleaning position, in which the pipe is sealed away from the interior of the tank.
- the pipe in the second position, is positioned against an air blast nozzle for cleaning the pipe.
- the same air blowing nozzle makes it possible to clean the pipe in the low position of the pipe and to achieve a fluidization of the powder near the end of the pipe when the latter is in the high position.
- the equipment comprises a permanent exhaust for regulating the pressure in the tank.
- the air injection means comprise at least one proportional valve for regulating the pressure in the reservoir.
- the present invention also relates to a powder supply method of a powder coating plant, in particular a painting installation of parts using electrostatic powder comprising:
- a spraying phase in which the powder is fluidized, and the reservoir is emptied by a starting pipe to at least one device for using the powder located at a distance, in particular a sprayer, the reservoir being depressed with respect to the supply means during at least part of the filling phase.
- a fluidization rate of compressed air is maintained in the reservoir during the filling phase.
- the feed means comprise a powder supply valve for closing off a feed pipe for the powder, the powder supply valve being cleaned, and then closed at the end of the filling phase.
- the depression of the tank relative to the supply means is eliminated before proceeding with the cleaning of the powder supply valve.
- the powder feed pipe is moved between a first position during the spraying phase, wherein the powder in the reservoir can enter the pipe, and a second position during the filling phase, in which the pipe is sealed from the interior of the tank.
- cleaning the pipe by blowing air in the second position.
- Figure 1 is a schematic view of a principle of an equipment according to the invention.
- Figure 2 is a sectional view of a tank according to the invention, the starting tube being in the lower position.
- Fig. 3 is a diagram showing the operation of the equipment members during the process phases.
- a powder supply equipment for a powder coating plant comprises a reservoir 2, intended to contain powder.
- the equipment comprises means for measuring the quantity of powder in the tank 2, constituted for example by weighing means 3 of the mass of the tank 2.
- the equipment also comprises means for feeding powder into the tank.
- feed means comprise a supply line 4 to the tank 2 and a supply valve 5 intended to close the feed pipe 4 of the powder.
- the supply valve is of the sleeve valve type.
- the feed duct 4 is connected downstream to unrepresented loading means, in particular to a filling tank.
- the supply duct 4 is arranged substantially horizontally, and the powder supply valve 5 is disposed at a horizontal section of this duct, which avoids any compaction of powder by gravity at the valve 5.
- the supply duct 4 is extended by a bend 6 which opens into the upper wall of the tank.
- An air inlet 7 is provided at the bend 6, in the axis of the supply duct, facing it.
- This pressurized air inlet which makes it possible to propel air upstream of the supply channel 4, constitutes a means for cleaning the powder supply valve 5 in the open position.
- the equipment also comprises a starting pipe 8 of the powder driven by the air, from the tank 2, this pipe being connected to a sprayer 9 located at a distance.
- the equipment further comprises compressed air injection means in the lower part of the tank, for fluidizing the powder.
- the reservoir comprises a porous element 10 defining a first upper compartment 12 containing the powder and a second lower compartment 13 of the reservoir 2 containing compressed air, the air injection means comprise a first air intake 14 located in below the porous element 10 and a nozzle 15 whose opening is located below the end of the powder starting pipe, and above the porous element 10.
- the equipment comprises means for depressurizing the reservoir relative to the supply means.
- the means for depressurizing the reservoir relative to the supply means comprise a venturi device 16, whose suction intake 17 is positioned in the center of a cyclone 18 for separating the air and the powder.
- the cyclone 18 opens at the end of its conical portion in the upper wall of the tank 2.
- a filter 19 is positioned on the suction port 17, to complete the separation of air and powder.
- the venturi device 16 is powered by a proportional vacuum valve 20 to adjust the suction flow and thus the vacuum produced.
- the depressurizing means comprise a valve 22, of the sleeve valve type, for cutting the flow rate in the depression means.
- a permanent exhaust 23 making it possible to reduce the pressure in the tank 2.
- the air injection means comprise proportional valves 24, 25 which also make it possible to regulate the pressure in the chamber. reservoir 2.
- An unrepresented pressure sensor placed in the reservoir makes it possible to obtain a pressure measurement and to implement the pressure regulation.
- the equipment further comprises means for moving the powder starting pipe 8 between a first high position in which the powder in the reservoir can penetrate the pipe, and a second low cleaning position, shown in FIG. in which the pipe 8 is positioned against the blowing nozzle 15 of the air injection means, thereby cleaning the pipe 8.
- the end of the starting pipe 8 located in the reservoir is made of a material limiting the polymerization of the powder, in particular a polyamide material.
- a powder supply method of a powder coating plant can be implemented, which comprises a phase of filling the powder tank from the powder supply means, and a phase of spraying in wherein the powder is fluidized, and the reservoir is emptied by the starting pipe to at least one remote sprayer.
- Curve B the closing or opening state of the sleeve valve 22 to cut the flow in the depression means; ia value 1 indicates a closed valve, the value 0 indicates an open valve.
- Curve C the closing or opening state of the powder supply sleeve valve; the value 1 indicates a closed valve, the value 0 indicates an open valve.
- A the flow rate in the first air injection inlet 14 for the fluidization is at a maximum value dAmin;
- B the sleeve valve 22 is closed,
- C the powder supply sleeve valve 5 is closed
- D the air flow rate in the venturi device is zero
- E the powder mass is at a low value mmin
- F the air flow rate at the level of the air inlet constituting the cleaning means of the powder supply valve 5 is zero
- G the flow rate of the air injection nozzle 14 for the fluidization and for the cleaning of the pipe 8 is at a low value dGmax, making it possible to carry out the local fluidization of the powder at the end of the starting pipe .
- the flow rate in the first air injection inlet 14 for the fluidization, controlled by the proportional valve 24, goes to a minimum value dAmin, the sleeve valve 22 making it possible to cut the flow rate in the flow means.
- depression is open allowing the establishment of a flow rate in the means of depression, the flow rate of the nozzle 14 of air injection is set to a high value dGmax, allowing perform the cleaning of the powder starting pipe 8, this pipe being moved to the low position.
- the powder supply sleeve valve 5 is opened, and the flow rate in the air inlet of the venturi device 16 of the vacuuming means, controlled by the proportional valve 20, changes to a level haur dDmax.
- the reservoir 2 is in depression with respect to the supply means, and the powder is sucked towards the reservoir 2.
- the mass of powder in the reservoir increases.
- the pipe 8 is positioned against the air blast nozzle 15 to clean it.
- the sleeve valve 22 for cutting the flow rate in the vacuum means is closed, the flow rate in the air inlet of the venturi device 16 means of Depression, controlled by the proportional valve 20 is cut, and the flow rate of the air injection nozzle 14 for fluidization and cleaning of the pipe 8 drops to a low value dGmin sufficient for fluidization.
- the flow rate in the air inlet of the venturi device 16 of the depressurizing means, controlled by the proportional valve 20 is restored to a value dDmax, while the valve 22 is closed, which allows creating an overpressure to clean the filter 19, without creating depression in the tank; the air flow at the air inlet constituting the cleaning means of the powder supply valve 5 goes to a level dFmax, which makes it possible to clean the valve 5 which is open.
- the increase of the air flow at the air inlet constituting the cleaning means of the powder supply valve 5 and the increase of the flow rate in the air inlet of the Venturi device 16 depression means can be desynchronized.
- several pulses on the flow in the air inlet of the venturi device 16 may be provided to complete the cleaning of the filter.
- the powder supply sleeve valve 5 is closed, the flow rate in the air inlet of the venturi device 16 of the depressurizing means, controlled by the proportional valve 20 is cut, the flow rate air at the air inlet constituting the cleaning means of the powder supply valve 5 is cut. Under these conditions, the supply means are isolated from the reservoir, and the depression means no longer work. The filling phase is completed, and the valve 5 of the supply means, the powder starting pipe 8 and the filter 19 of the vacuum means have been cleaned.
- the spraying phase starts, the starting pipe being moved to the high position in which the powder present in the tank 2 can enter the pipe 8, and the flow rate in the first injection inlet 14 of air for fluidization increasing to a high value dAmax.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0607165A FR2904574B1 (en) | 2006-08-04 | 2006-08-04 | POWDER PUMP WITH DEPRESSION FILLING |
PCT/EP2007/006342 WO2008014886A1 (en) | 2006-08-04 | 2007-07-18 | Powder pump with vacuum filling |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2046504A1 true EP2046504A1 (en) | 2009-04-15 |
EP2046504B1 EP2046504B1 (en) | 2011-12-07 |
Family
ID=37909431
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07786134A Not-in-force EP2046504B1 (en) | 2006-08-04 | 2007-07-18 | Powder pump with vacuum filling |
Country Status (7)
Country | Link |
---|---|
US (1) | US8101233B2 (en) |
EP (1) | EP2046504B1 (en) |
CN (1) | CN101563167B (en) |
CA (1) | CA2659719C (en) |
FR (1) | FR2904574B1 (en) |
NO (1) | NO20090957L (en) |
WO (1) | WO2008014886A1 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008016395A1 (en) * | 2008-03-29 | 2009-10-08 | Eisenmann Anlagenbau Gmbh & Co. Kg | Reservoir for powdered media, plant for conveying powdered media and method for operating such |
DE102010025740A1 (en) | 2010-06-30 | 2012-01-05 | Illinois Tool Works Inc. | Powder supply device and method for automatically cleaning a powder supply device |
US8767214B2 (en) * | 2011-10-06 | 2014-07-01 | Nordson Corporation | Powder flow detection |
CN102976103B (en) * | 2012-12-04 | 2014-12-03 | 裕东(中山)机械工程有限公司 | Conveniently cleaned powder supplying device |
CN103008191A (en) * | 2012-12-06 | 2013-04-03 | 中山市君禾机电设备有限公司 | Powder box of sealed type powder supply center |
CN103331226B (en) * | 2013-07-04 | 2015-09-02 | 裕东(中山)机械工程有限公司 | A kind of Automatic clearance powder feeder unit of closed cycle |
DE102013218326A1 (en) * | 2013-09-12 | 2015-03-12 | Gema Switzerland Gmbh | Powder supply device for a powder coating system |
US20150084282A1 (en) * | 2013-09-25 | 2015-03-26 | Hogsback Designs, Inc | Systems and methods for pneumatically actuated displays for colored powder |
CN104874501A (en) * | 2015-05-04 | 2015-09-02 | 中山市君禾机电设备有限公司 | Powder pump structure used for powder spraying production line |
CN106179813B (en) * | 2016-08-30 | 2019-01-08 | 裕东(中山)机械工程有限公司 | It is a kind of with the external powder absorbing pipe powder supply unit for quickly cleaning function |
CN108160408B (en) * | 2016-12-05 | 2022-04-29 | 塔工程有限公司 | Control device for coating head unit |
CN109042139B (en) * | 2018-08-28 | 2020-10-20 | 重庆赐康果蔬有限公司 | Tomato early blight prevention and control method |
CN110575936B (en) * | 2019-09-19 | 2020-10-27 | 威马汽车科技集团有限公司 | Car is to cut to rub and is fallen car touch-up paint equipment of lacquer based on car |
CN114251311B (en) * | 2020-09-21 | 2024-03-22 | 汕头市潮南区振业实业有限公司 | Air pump assembly for anhydrous sodium sulfate dry powder automatic conveying system and control method |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4288466A (en) * | 1978-07-12 | 1981-09-08 | Owens-Illinois, Inc. | Power preconditioning for electrostatic application |
CN2087101U (en) * | 1991-02-09 | 1991-10-23 | 朱忠民 | Powder feeding device for powder coating fluidized-bed |
US5518546A (en) * | 1994-10-05 | 1996-05-21 | Enexus Corporation | Apparatus for coating substrates with inductively charged resinous powder particles |
US7273339B2 (en) * | 2003-03-07 | 2007-09-25 | Haden Schweitzer Corporation | Powder transport method and apparatus |
DE102004007967A1 (en) * | 2004-02-18 | 2005-09-08 | Dürr Systems GmbH | Powder feed pump and associated operating method |
FR2872067A1 (en) * | 2004-06-28 | 2005-12-30 | Eisenmann France Sarl Sarl | Dust dosage and supply equipment for painting installation, has outlet pipe driven by air from reservoir body and directed towards dust sprayer situated at distance, and plate and servo motor controlling flow rate of dust in pipe |
-
2006
- 2006-08-04 FR FR0607165A patent/FR2904574B1/en not_active Expired - Fee Related
-
2007
- 2007-07-18 EP EP07786134A patent/EP2046504B1/en not_active Not-in-force
- 2007-07-18 US US12/376,216 patent/US8101233B2/en not_active Expired - Fee Related
- 2007-07-18 CA CA2659719A patent/CA2659719C/en not_active Expired - Fee Related
- 2007-07-18 CN CN2007800288873A patent/CN101563167B/en not_active Expired - Fee Related
- 2007-07-18 WO PCT/EP2007/006342 patent/WO2008014886A1/en active Application Filing
-
2009
- 2009-03-02 NO NO20090957A patent/NO20090957L/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO2008014886A1 * |
Also Published As
Publication number | Publication date |
---|---|
US8101233B2 (en) | 2012-01-24 |
US20090263575A1 (en) | 2009-10-22 |
NO20090957L (en) | 2009-03-02 |
WO2008014886A1 (en) | 2008-02-07 |
FR2904574A1 (en) | 2008-02-08 |
CN101563167A (en) | 2009-10-21 |
CA2659719A1 (en) | 2008-02-07 |
CN101563167B (en) | 2011-11-30 |
CA2659719C (en) | 2014-10-28 |
EP2046504B1 (en) | 2011-12-07 |
FR2904574B1 (en) | 2008-10-10 |
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