EP0629451A1 - Dispositif pour le transfert de poudre - Google Patents

Dispositif pour le transfert de poudre Download PDF

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Publication number
EP0629451A1
EP0629451A1 EP94105212A EP94105212A EP0629451A1 EP 0629451 A1 EP0629451 A1 EP 0629451A1 EP 94105212 A EP94105212 A EP 94105212A EP 94105212 A EP94105212 A EP 94105212A EP 0629451 A1 EP0629451 A1 EP 0629451A1
Authority
EP
European Patent Office
Prior art keywords
powder
section
vacuum
valve
air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94105212A
Other languages
German (de)
English (en)
Inventor
Felix Mauchle
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gema Switzerland GmbH filed Critical Gema Switzerland GmbH
Publication of EP0629451A1 publication Critical patent/EP0629451A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • 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 invention relates to a powder conveying device according to the preamble of claim 1.
  • Such a powder delivery device with a jet pump according to the injector principle or the Venturi principle is known from DE-OS 39 26 624 A1.
  • the powder is used for the electrostatic spray coating of objects and can consist, for example, of plastic, ceramic or another coating material.
  • the invention is not based on plants electrostatic spray coating of objects with powder limited, but can also be used to convey powder for other purposes.
  • a jet pump which works according to the injector principle or the Venturi tube principle, is usually used to convey powder from a container or a container to a spray gun or another spray device for the electrostatic spray coating of objects.
  • an air jet in a negative pressure area which is formed by widening the channel, creates a negative pressure which is used to suck powder out of the container or container.
  • the extracted powder is entrained by the air jet and transported to the spraying device.
  • the flow velocity of the powder-air mixture in the hose must be at least 10 m / s.
  • the air jet which is used for generating the vacuum and powder delivery, hereinafter referred to as conveying air, so small that the flow velocity in Hose would drop below 10 m / s.
  • conveying air In order to avoid this drop in speed and also in this case to have a flow speed of at least 10 m / s in the hose, it is known to supply additional air to the powder-air stream downstream of the vacuum region.
  • the powder feed can be switched on and off by switching the feed air flow on or off.
  • the powder in the hose is no longer conveyed to the spray device, but remains in the hose.
  • this powder is entrained by the air front and transported to the spraying device as an excessive amount of powder. This affects the coating result totally negatively, either because there is too much powder accumulation on the object to be coated or the powder is blown away from it, or in order to avoid this disadvantage the spray device has to be moved away from the object to be coated.
  • Such a disruptive "powder cloud” can be significantly reduced by flushing the hose with air between switching it off and on again.
  • the conveying air and the dosing air together may only result in a predetermined total air volume and a predetermined total air velocity. This requires additional energy and device effort. A complete shutdown of the powder feed by a correspondingly supplied amount of dosing air, while maintaining it unchanged
  • the conveyed air flow obtained is theoretically possible, but requires a lot of dosing air and a complicated regulation of the dosing air depending on the negative pressure in the negative pressure range such that only as much dosing air is supplied for each conveying air rate as is exactly necessary to switch off the powder feed. So far, there is no such device.
  • air is required to convey the powder, too much air is extremely undesirable in electrostatic powder coating because a large amount of air blows the powder particles away from the object to be coated. It must also be avoided that the dosing air flows into the powder container.
  • the invention is intended to achieve the object of creating a possibility for the powder conveying device of the type mentioned at the outset to adjust the amount of powder conveyed and, if necessary, to suddenly switch off the powder conveyance quickly and completely, without the conveying air flow having to be adjusted or switched off and without the need for complicated Control device for setting a favorable amount of dosing air depending on changing flow situations in the powder-air path.
  • the air introduced into the vacuum region in addition to the conveying air according to the invention is not called metering air, but control air.
  • the invention in a simple manner partially or completely removes the space limitation of the vacuum duct section required for vacuum formation by opening the control air inlet to the outside atmosphere. All of a sudden, the entire outside air atmosphere is available in the vacuum duct section. For a similarly reacting setting or switching off the powder feed while maintaining the conveying air flow, not only would a high pressure of a compressed air source for the dosing air be required in the prior art, but also a large compressed air reservoir for the dosing air directly at the control air inlet, which would suddenly provide the entire amount of dosing air required poses.
  • a major advantage of the invention is that it regulates itself: the negative pressure in the negative pressure area automatically draws in only as much outside air as control air as is necessary to reduce or completely interrupt the powder feed.
  • control air draws in a corresponding amount of outside air as control air.
  • control air inlet needs to be opened to a greater or lesser extent in order to connect the vacuum channel section to the outside atmosphere in a throttled or unthrottled manner.
  • a compressed air source is not required to generate the control air.
  • the valve can be an abruptly completely opening and abruptly completely closing two-position valve. In another embodiment, it can also be a valve which, in addition to this possibility of suddenly opening and closing completely, also has the possibility of setting intermediate positions in which the valve is also open to the outside air, but only allows the outside air to flow into the negative pressure region in a throttled manner. As a result, the invention not only enables the powder feed to be switched on and off suddenly, but, depending on the operating situation, the independently drawn in outside air can also be used to set a specific powder feed rate.
  • the valve can be an electrically, pneumatically or hydraulically actuated valve. The valve is preferably designed in such a way that it is cleaned by the control air flow by driving this powder particle back into the jet pump.
  • the powder flow is switched off by suppressing the vacuum in the vacuum channel section.
  • the control air inlet is opened by opening the valve, which draws in air directly from the environment.
  • the aspirated ambient air prevents powder from being sucked out of the container or container.
  • the powder flow can be switched off partially or completely.
  • additional air can be supplied downstream of the vacuum duct section.
  • the powder feed can be switched on again very quickly by completely or partially closing the valve happen, and the hose leading from the powder conveying device to a spray device or spray gun does not have to be rinsed or cleaned.
  • the switch-on time and the switch-off time can be chosen as short as desired and regardless of the position of the workpiece to be coated with respect to the spraying device.
  • the powder feed device shown in FIG. 1 contains a jet pump 2, in which a feed channel 4 is formed.
  • the conveying duct 4 has a conveying air inlet duct section 6 which is narrow in cross section and a vacuum duct section 8 which adjoins it downstream and has a larger cross section.
  • a conveying air flow 10 generates a negative pressure according to the injector principle or the Venturi tube principle.
  • the conveying air stream 10 is generated by an overpressure source 12 and can be adjusted by a pressure regulator or an adjustable flow restrictor 14.
  • In the vacuum duct section 8 opens into a powder inlet 16 for sucking powder 18 from a powder container 20 or container into the vacuum duct section 8 by the vacuum generated by the conveying air stream 10.
  • the container 20 shown in FIG. 1 has a perforated container base 22, through which fluidizing air 24 flows into the container 20 for fluidizing the powder 18.
  • a control air inlet 26 opens into the vacuum channel section 8 for introducing control air 30 from the outside atmosphere surrounding the jet pump 2. With the control air 30, the vacuum can be reduced in the vacuum duct section 8 and the powder quantity conveyed can thereby be controlled.
  • An outlet duct section 32 adjoins the vacuum duct section 8 axially to the conveying air inlet duct section 6.
  • a hose 34 is connected to the outlet channel section 32 and serves for a spray gun (not shown) for electrostatically spray coating objects with the powder 18.
  • the control air inlet 26 is formed by a short connecting piece between the vacuum channel section 8 and a valve 36, so that the vacuum channel section 8 can be connected to the outside atmosphere in the shortest possible flow, which acts directly and thus unthrottled on an inlet 38 of the valve 36.
  • the valve 36 can be a 2/2-way valve, that is to say a so-called 2-port 2-way valve, which can be electric, pneumatic or is suddenly hydraulically adjustable between an open position and a closed position.
  • the valve can also be designed such that, in addition to these abruptly quickly adjustable open and closed positions, it can also be set to intermediate positions in order to introduce throttled control air 30 from the outside atmosphere into the vacuum channel section 8.
  • the control air inlet 26 and the valve 36 each have such a large flow cross-section that, when the valve 36 is fully open, no powder-promoting vacuum can form in the vacuum channel section 8 even when the conveying air flow 10 is set to maximum flow strength.
  • the flow cross section of the control gas inlet 26 and the flow cross section of the valve 36 when it is fully open, each have a size which is in the range between 50% of the cross section size of the outlet duct section 32 immediately downstream of the vacuum duct section 8 and the largest flow cross section of the vacuum duct section 8 lies.
  • the fault cross-section of the control air inlet 26 and the valve 36, when it is fully open, is approximately the same size as the flow cross-section of the outlet duct section 32 at its position opposite the vacuum duct section 8.
  • the flow cross sections of the control air inlet 26 and the fully open valve 36 are each at least as large as the flow cross section of the powder inlet 16.
  • the flow cross-sections of the control air inlet 26 and the valve 36, when it is fully open, should be made as large as possible so that when the valve 36 is opened, the negative pressure in the negative pressure channel section 8 is abruptly reduced to the pressure of the outside atmosphere can.
  • An additional air inlet 40 for additional air 42 can open into the outlet channel section 32 at a distance downstream from the vacuum channel section 8, with which the required minimum air speed in the powder-air hose 34 is ensured. 1, starting approximately at the additional air inlet 40, may have an increasingly larger flow cross section in the flow direction.
  • the vacuum duct section 8 is connected directly to the outside atmosphere by means of the valve 36 without the interposition of a pump or a compressor.
  • control air inlet 26 and the valve 36 preferably each have such a large flow cross section that When the valve in the vacuum duct section 8 is fully open, no powder-promoting vacuum can form even at the maximum strength of the conveying air flow.
  • the control air inlet 26 is formed by the valve 36.
  • the valve 36 here consists of a valve seat 50 in the form of a ring and a valve plate 52.
  • FIG. 2 shows the valve 36 in the closed state. It is opened by lifting the valve plate 52 from the valve seat 50.
  • opening and closing a narrow annular gap is created, in which the control air 30 from the outside atmosphere has a high flow velocity into the vacuum channel section 8.
  • valve 36 has a larger flow cross section than the powder inlet 16.
  • the flow cross sections can also be different.

Landscapes

  • Air Transport Of Granular Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
EP94105212A 1993-06-15 1994-04-02 Dispositif pour le transfert de poudre Withdrawn EP0629451A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4319726 1993-06-15
DE4319726A DE4319726A1 (de) 1993-06-15 1993-06-15 Pulverfördereinrichtung

Publications (1)

Publication Number Publication Date
EP0629451A1 true EP0629451A1 (fr) 1994-12-21

Family

ID=6490343

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94105212A Withdrawn EP0629451A1 (fr) 1993-06-15 1994-04-02 Dispositif pour le transfert de poudre

Country Status (2)

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EP (1) EP0629451A1 (fr)
DE (1) DE4319726A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0913204A1 (fr) * 1997-11-03 1999-05-06 ITW Gema AG Méthode et appareil de revêtement par poudre
US6217654B1 (en) 1997-11-03 2001-04-17 Itw Gema Ag Method and equipment for powder spray coating
US7530505B2 (en) * 2004-12-16 2009-05-12 J. Wagner Ag Powder conveying device and catching nozzle for the powder conveying device
CN101274710B (zh) * 2008-04-30 2011-02-02 浙江理工大学 激波管-拉伐尔喷嘴加速固体颗粒群装置
WO2012003194A1 (fr) * 2010-06-30 2012-01-05 Illinois Tool Works Inc. Buse de réception de jet destinée à un injecteur de fourniture de poudre, et injecteur de fourniture de poudre
USRE43824E1 (en) 2001-01-11 2012-11-20 Powder Pharmaceuticals Inc. Needleless syringe
CN102974488A (zh) * 2012-11-30 2013-03-20 裕东（中山）机械工程有限公司 一种切向进粉的文丘里粉泵
US8540665B2 (en) 2007-05-04 2013-09-24 Powder Pharmaceuticals Inc. Particle cassettes and processes therefor
WO2014170374A1 (fr) * 2013-04-17 2014-10-23 Sames Technologies Pompe a effet venturi et installation d'application de revetement de peinture
CN111315495A (zh) * 2017-09-12 2020-06-19 卡莱流体技术有限公司 用于粉末涂料的颜色更换系统
CN113184544A (zh) * 2021-03-11 2021-07-30 中山市君禾机电设备有限公司 粉泵及包含其的粉体输送装置
CN115791547A (zh) * 2023-02-09 2023-03-14 合肥金星智控科技股份有限公司 一种粉体物料粒径在线监测系统及方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19531421A1 (de) * 1995-08-26 1997-02-27 Gema Volstatic Ag Injektor-Vorrichtung zur Pulver-Sprühbeschichtung
DE29723226U1 (de) 1997-07-10 1998-06-04 Kolb, Robert, jun., 88046 Friedrichshafen Druckluft-Injektor zur pneumatischen Förderung eines Pulvers
DE19824802A1 (de) * 1998-06-03 1999-12-09 Itw Gema Ag Pulverförder-Injektor
DE102010039473B4 (de) * 2010-08-18 2014-11-20 Gema Switzerland Gmbh Pulverversorgungsvorrichtung für eine Pulverbeschichtungsanlage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0282873A2 (fr) * 1987-03-16 1988-09-21 Ransburg-Gema AG Ejecteur pneumatique
DE3926624A1 (de) * 1989-08-11 1991-02-14 Gema Ransburg Ag Elektrostatische pulverbeschichtungseinrichtung
FR2666753A1 (fr) * 1990-09-18 1992-03-20 Sames Sa Dispositif d'alimentation d'un appareil de projection de poudre.

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CH436120A (de) * 1966-06-28 1967-05-15 Gema Ag Pneumatische Fördereinrichtung mit regelbarer Förderleistung
US3740612A (en) * 1971-05-28 1973-06-19 Champion Spark Plug Co Apparatus for coating with electrostatically charged particulate materials
BE791034A (fr) * 1971-11-18 1973-03-01 Ransburg Corp Appareil et procede de pulverisation
CH595951A5 (en) * 1975-07-24 1978-02-28 Oskar Reichert Medium flow control arrangement for spray guns or similar appts.
US4002372A (en) * 1975-12-01 1977-01-11 General Shale Products Corporation Pulverulent material metering and delivery system and method
US4090645A (en) * 1976-08-23 1978-05-23 Electro Sprayer Systems, Inc. Powder metering system
DE2930121C2 (de) * 1979-07-25 1982-05-27 Gema AG Apparatebau, 9015 St. Gallen Verfahren und Einrichtung zum Sprühbeschichten von Gegenständen mit Pulver
FR2521170B1 (fr) * 1982-02-09 1986-11-21 Dietrich & Cie De Procede pour l'emaillage d'objets par pistolage electrostatique
GB2127370B (en) * 1982-09-17 1986-09-24 Missier Gabriele Trasmetal Improved dispenser of powdered electrostatic varnish with auxiliary ducts for feeding compressed air
DE3413757A1 (de) * 1984-04-12 1985-10-24 Kurt F. 8942 Ottobeuren Lipfert Verfahren und vorrichtung zum beschicken eines behaelters mit pulvrigen guetern
DE3546231A1 (de) * 1985-12-27 1987-07-02 Gerhard Hestermann Pulver-spruehpistole
DE3721875A1 (de) * 1987-07-02 1989-01-12 Gema Ransburg Ag Verfahren und einrichtung fuer eine pulverspruehbeschichtungsanlage
DE3729714A1 (de) * 1987-09-04 1989-03-23 Gema Ransburg Ag Pulveraufbereitungsanlage fuer beschichtungspulver
DE3824908A1 (de) * 1988-07-22 1990-02-01 Gema Ransburg Ag Verfahren und vorrichtung zum elektrostatischen spruehbeschichten
SU1713664A1 (ru) * 1989-07-11 1992-02-23 Lukyanov Viktor A Способ регулировани подачи мелкодисперсного материала и устройство дл его осуществлени
DD301336A7 (de) * 1989-10-11 1992-12-03 Rinder Schweine Ausruest Wasserstrahlpumpe zum Beimischen von aggressiven Flüssigkeiten
EP0427881A1 (fr) * 1989-11-13 1991-05-22 Fritz Werner Industrie-Ausrüstungen GmbH Procédé et dispositif pour réglage de débit volumétrique d'une installation de transport par l'aspiration d'air
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0282873A2 (fr) * 1987-03-16 1988-09-21 Ransburg-Gema AG Ejecteur pneumatique
DE3926624A1 (de) * 1989-08-11 1991-02-14 Gema Ransburg Ag Elektrostatische pulverbeschichtungseinrichtung
FR2666753A1 (fr) * 1990-09-18 1992-03-20 Sames Sa Dispositif d'alimentation d'un appareil de projection de poudre.

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6194027B1 (en) 1997-11-03 2001-02-27 Itw Gema Ag Method and equipment for powder spray coating
US6217654B1 (en) 1997-11-03 2001-04-17 Itw Gema Ag Method and equipment for powder spray coating
EP0913204A1 (fr) * 1997-11-03 1999-05-06 ITW Gema AG Méthode et appareil de revêtement par poudre
USRE43824E1 (en) 2001-01-11 2012-11-20 Powder Pharmaceuticals Inc. Needleless syringe
US7530505B2 (en) * 2004-12-16 2009-05-12 J. Wagner Ag Powder conveying device and catching nozzle for the powder conveying device
US8540665B2 (en) 2007-05-04 2013-09-24 Powder Pharmaceuticals Inc. Particle cassettes and processes therefor
US9358338B2 (en) 2007-05-04 2016-06-07 Powder Pharmaceuticals Incorporated Particle cassettes and processes therefor
US9044546B2 (en) 2007-05-04 2015-06-02 Powder Pharmaceuticals Incorporated Particle cassettes and processes therefor
CN101274710B (zh) * 2008-04-30 2011-02-02 浙江理工大学 激波管-拉伐尔喷嘴加速固体颗粒群装置
WO2012003194A1 (fr) * 2010-06-30 2012-01-05 Illinois Tool Works Inc. Buse de réception de jet destinée à un injecteur de fourniture de poudre, et injecteur de fourniture de poudre
CN103037977A (zh) * 2010-06-30 2013-04-10 伊利诺斯工具制品有限公司 用于粉末输送喷射器的射流接收喷嘴以及粉末输送喷射器
JP2013535384A (ja) * 2010-06-30 2013-09-12 イリノイ ツール ワークス インコーポレイテッド 粉体吐出インジェクタ用噴射受け取りノズル及び粉体吐出インジェクタ
US9486827B2 (en) 2010-06-30 2016-11-08 Gema Switzerland Gmbh Jet-receiving nozzle for a powder-delivery injector plus powder-delivery injector
CN103037977B (zh) * 2010-06-30 2015-04-22 伊利诺斯工具制品有限公司 用于粉末输送喷射器的射流接收喷嘴以及粉末输送喷射器
CN102974488A (zh) * 2012-11-30 2013-03-20 裕东（中山）机械工程有限公司 一种切向进粉的文丘里粉泵
FR3004767A1 (fr) * 2013-04-17 2014-10-24 Sames Technologies Pompe a effet venturi et installation d'application de revetement de peinture
CN105283675A (zh) * 2013-04-17 2016-01-27 萨姆斯技术公司 文丘里泵和用于涂覆涂料的设备
WO2014170374A1 (fr) * 2013-04-17 2014-10-23 Sames Technologies Pompe a effet venturi et installation d'application de revetement de peinture
CN105283675B (zh) * 2013-04-17 2017-03-22 萨姆斯技术公司 文丘里泵和用于涂覆涂料的设备
US9636695B2 (en) 2013-04-17 2017-05-02 Sames Technologies Venturi pump and facility for applying paint coatings
CN111315495A (zh) * 2017-09-12 2020-06-19 卡莱流体技术有限公司 用于粉末涂料的颜色更换系统
US11850614B2 (en) 2017-09-12 2023-12-26 Carlisle Fluid Technologies, LLC Colour change system for powder coating
CN113184544A (zh) * 2021-03-11 2021-07-30 中山市君禾机电设备有限公司 粉泵及包含其的粉体输送装置
CN113184544B (zh) * 2021-03-11 2022-12-06 中山市君禾机电设备有限公司 粉泵及包含其的粉体输送装置
CN115791547A (zh) * 2023-02-09 2023-03-14 合肥金星智控科技股份有限公司 一种粉体物料粒径在线监测系统及方法
CN115791547B (zh) * 2023-02-09 2023-07-18 合肥金星智控科技股份有限公司 一种粉体物料粒径在线监测系统及方法

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