EP1752399B1 - Dispositif et procédé pour transporter de la poudre - Google Patents

Dispositif et procédé pour transporter de la poudre Download PDF

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Publication number
EP1752399B1
EP1752399B1 EP05017597A EP05017597A EP1752399B1 EP 1752399 B1 EP1752399 B1 EP 1752399B1 EP 05017597 A EP05017597 A EP 05017597A EP 05017597 A EP05017597 A EP 05017597A EP 1752399 B1 EP1752399 B1 EP 1752399B1
Authority
EP
European Patent Office
Prior art keywords
valve
powder
vacuum
compressed air
conveying
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.)
Not-in-force
Application number
EP05017597A
Other languages
German (de)
English (en)
Other versions
EP1752399A1 (fr
Inventor
Leopold Von Keudell
Daniel Ziwica
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.)
J Wagner AG
Original Assignee
J Wagner 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
Application filed by J Wagner AG filed Critical J Wagner AG
Priority to EP05017597A priority Critical patent/EP1752399B1/fr
Priority to AT05017597T priority patent/ATE421477T1/de
Priority to DE502005006537T priority patent/DE502005006537D1/de
Publication of EP1752399A1 publication Critical patent/EP1752399A1/fr
Application granted granted Critical
Publication of EP1752399B1 publication Critical patent/EP1752399B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/1459—Arrangements for supplying particulate material comprising a chamber, inlet and outlet valves upstream and downstream the chamber and means for alternately sucking particulate material into and removing particulate material from the chamber through the valves

Definitions

  • a powder coating plant is a plant for coating workpieces with powder.
  • the powder is conveyed by means of a conveying device from a powder storage container and transported to a powder spray gun, in order then to be applied by means of the powder spray gun to the workpiece to be coated.
  • the conveyor may be, for example, a pump or a venturi-type injector.
  • the system also includes a booth into which the workpieces are coated. The excess, not adhering to the workpiece powder is collected, transported to egg nem powder container and can then be used again for coating.
  • the invention relates to a device for conveying powder, which is also referred to below as a conveying device, and a method for operating the device.
  • the conveying device can be used, for example, for transporting the powder to the spray gun or also for the return transport of the excess powder.
  • a pump for coating powder includes a pump chamber into which powder is sucked by vacuum and from which the powder is blown out by means of compressed air. By means of several pinch valves, the transport of the powder into the pump chamber and out of the pump chamber is controlled.
  • the pump chamber is formed by a lutt terme umane, for example made of porous polyethylene sleeve.
  • the powder inlet valve is closed, the powder outlet valve is opened and the powder sucked into the sleeve is blown out of the sleeve by means of purging air.
  • the powder outlet valve is opened and the powder sucked into the sleeve is blown out of the sleeve by means of purging air.
  • the powder inlet valve is closed, the powder outlet valve is opened and the powder sucked into the sleeve is blown out of the sleeve by means of purging air.
  • the powder can close the pores of the sleeve. This in turn reduces the suction and delivery rate of the pump, the pump will not operate at a constant rate over time, the operating characteristics of the pump will change and the sleeve will wear out. If the parameters of the pump change too much, replace the sleeve with a new sleeve.
  • the powder feed pump comprises a feed chamber with an inlet which can be closed by an inlet valve, and an outlet which can be closed by an outlet valve.
  • a vacuum connection is provided in order to generate a negative pressure in the delivery chamber through which powder can be sucked.
  • the vacuum connection can be closed by a suction valve.
  • a device for the pneumatic conveying of powdery substances known.
  • the device comprises a pipe system, wherein a volume is sucked in with negative pressure and discharged with overpressure for continuation.
  • a metering chamber which can be alternately filled and emptied via a control device, is provided for metering the pulverulent substance.
  • a supply line and a discharge line connected to this metering chamber on the one hand - with the interposition of a filter - a gas pressure line and a suction line and on the other hand.
  • a pneumatic conveying device for dusty or granular material, such as cement, flour, grain or fertilizer with a suction device is known.
  • the conveying device comprises two containers and a compressor.
  • the containers are operated alternately with suction or pressure conveying.
  • the switched on pressure conveying container is connected to a pressure conveying line.
  • An object of the invention is to provide a device for conveying powder and a method for operating the device, wherein the number of moving parts and the wear are minimized.
  • the device according to the invention also works over a longer period of time with constant power.
  • the device according to the invention for conveying powder has a delivery chamber which is arranged between a powder inlet valve and a powder outlet valve.
  • the delivery chamber is connected via a first channel to a vacuum valve via which in the delivery chamber a negative pressure can be generated.
  • the delivery chamber is connected via a second and a third channel with a compressed air valve.
  • the third channel is arranged so that compressed air can be blown through it in the direction of the inlet valve.
  • the inventive method for conveying powder with the powder conveying device comprises the following work cycles.
  • a negative pressure is generated in the delivery chamber.
  • the powder is sucked into the delivery chamber and then the powder is blown out of the delivery chamber in a third operating cycle.
  • the second channel is arranged opposite to the first channel.
  • the third channel is provided to connect the delivery chamber to the compressed air valve.
  • the third channel is arranged so that compressed air can be blown through it in the direction of the inlet valve. This allows the powder to be blown even better from the delivery chamber.
  • the compressed air valve and the vacuum valve are designed as solenoid valves.
  • the vacuum valve may be connected to an injector or other vacuum generator.
  • the inventive device To solve the problem is also proposed in the inventive device to connect the vacuum valve with a vacuum tank.
  • the tank forms a vacuum reservoir and relieves the vacuum pump.
  • the inlet valve and the outlet valve may be formed as hose valves.
  • the delivery chamber is formed as a straight channel and arranged the inlet valve at one end of the straight channel and the outlet valve at the other end of the straight channel.
  • the inlet valve and the outlet valve are closed in the first cycle and the vacuum valve is opened.
  • the vacuum valve is closed and the inlet valve is opened.
  • the inlet valve is closed and the outlet valve and the compressed air valve are opened.
  • the working cycles of the two devices are carried out offset in time from one another. This can increase the flow rate and make the powder flow more uniform. The powder flow then pulsates less.
  • the delivery rate can be adjusted via the frequency of the power strokes, the discharge air pressure, the vacuum, the opening time of the vacuum valve, the opening time of the inlet valve and / or the volume of the delivery chamber.
  • FIG. 1 is a possible embodiment of the conveyor device according to the invention shown in a three-dimensional view.
  • the conveyor comprises two parallel powder conveyors, which are summarized in an assembly. In principle, any number of powder conveyors can be combined to form an assembly.
  • the first powder conveyor has an intake valve EV1, a vacuum valve VV1, a compressed air valve DV1 and an exhaust valve AV1.
  • the second powder conveyor also has an inlet valve EV2, a vacuum valve VV2, compressed air valve DV2 and an outlet valve AV2.
  • the delivery chambers of the two powder conveyors are housed in a common housing 5. About a pressure air connection 6, which is attached to the housing 5, the two powder conveyors can be supplied with compressed air DL. In addition, a vacuum port 7 is provided on the housing 5.
  • the vacuum port 7 can be connected to a vacuum pump, which in FIG. 1 not shown, to be able to generate a negative pressure in the delivery chambers of the two powder conveyors can.
  • the two intake valves EV1 and EV2 as well as the two exhaust valves AV1 and AV2 are at the in FIG. 1 shown embodiment designed as pneumatically controlled pinch valves.
  • the two compressed air valves DV1 and DV2 as well as the two vacuum valves VV1 and VV2, on the other hand, are opened and closed via an electric actuator.
  • FIG. 2 the Pulverfordervoriques is shown in cross section along the section line AA.
  • the first inlet valve EV1 can be connected via an intake 4 with a powder hose or a powder line.
  • an elastic valve tube 2 is arranged, the inner cross section of which is reduced when it is acted upon by the valve control port 3 with compressed air DL.
  • the powder channel in the inlet valve EV1 is thereby closed.
  • the valve tube 2 is guided inside the housing 1 of the inlet valve EV1.
  • the inlet valve housing 1 is funnel-shaped on the inlet side and on the outlet side, so that on the inlet side, the conically shaped intake manifold 4 in the mounted state presses the valve tube 2 to the funnel-shaped inlet of the inlet valve housing 1.
  • the inlet valve housing 1 On the outlet side, the inlet valve housing 1 is provided with an external thread, so that it can be screwed into the housing 5.
  • the housing 5 is conically shaped on the inlet side and presses in the assembled state the valve tube 2 against the funnel-shaped inner wall of the inlet valve housing 1.
  • the valve tube 2 is fixed at its ends and also forms a sufficient seal.
  • valve tube 2 When the valve tube 2 is pressurized with compressed air, a pressure chamber is formed between the inlet valve housing 1 and the valve tube 2, which becomes larger the higher the air pressure generated by the compressed air DL. Finally, when the air pressure is high enough, the vertical hose 2 deforms so much that the powder intake passage in the intake valve EV1 is completely closed.
  • the exhaust valve AV1 which is arranged on the downstream side of the delivery chamber FK1, is identical to the Inlet valve EV1.
  • a powder hose or a powder line for removing the powder can be connected.
  • the control of the exhaust valve AV2 is via the valve control port 21 which is screwed into the Auslrawventilgephaseuse 19.
  • the valve tube of the exhaust valve AV1 is indicated by the reference numeral 20.
  • the vacuum valve VV1 is arranged in the upstream section of the delivery chamber FK1.
  • the vacuum valve VV1 is formed as a solenoid valve or electrically driven valve.
  • the valve stem 13 of the vacuum valve VV1 is guided in a guide sleeve 12 and moved by an electromagnetic valve drive 11. If the vacuum valve VV1 is open, so that the valve tappet 13 releases the channel 8 to the delivery chamber FK1, a negative pressure can be generated in the delivery chamber FK1.
  • the compressed air valve DV1 is disposed.
  • the pressure air valve DV1 may also be formed as a solenoid or solenoid valve. Its valve tappet 17 is guided in a guide sleeve 16 and moved over the valve drive 15. If the compressed air valve DV1 is opened, the two channels 9 and 10 are free, so that compressed air can flow into the delivery chamber FK1.
  • the channel 9 is arranged in the housing 5 so that an upstream compressed air flow is formed. As a result, the residual powder present in the upstream end of the delivery chamber FK1 can also be blown out of the delivery chamber 1.
  • the channel 10 is located directly opposite the channel 8, so that the through the channel 10 flowing compressed air DL the channel 8 freed of powder residues.
  • the vacuum valve VV1 and the inlet valve EV1 are closed, the outlet valve AV1 is opened and compressed air is blown through the delivery chamber FK1 in the direction of the outlet connection 22 via the open compressed air valve DV1.
  • the vacuum valve VV1 and the exhaust valve AV1 are closed, and the inlet valve EV1 and the compressed air valve DV 1 are opened.
  • compressed air flows through the two compressed air ducts 9 and 10 upstream through the inlet valve EV1 to the intake manifold 4.
  • the powder still in the powder conduit is thus blown back into the powder reservoir.
  • the longitudinal axis of the powder conveying device is identified by the reference LA and the conveying direction of the powder by P.
  • FIG. 3 is the in FIG. 1 shown powder conveying device along the section line BB shown in cross section.
  • compressed air DL is blown into the delivery chamber FK 1 when the first compressed air valve DV1 is opened. If, however, the compressed air valve DV2 is opened, compressed air DL is blown into the delivery chamber FK2 via the channel 40 and the channel 42. If the compressed air valve DV1 is closed and the vacuum valve VV1 is opened, air is sucked out of the delivery chamber FK1 from the delivery chamber FK1 via the channel 8 and the bore 41. Is the compressed air valve DV2 closed and the vacuum valve VV2 open, air is sucked from the delivery chamber FK2 via the channel 43 and the channel 41 from the delivery chamber FK2.
  • FIG. 4 is shown in the form of a block diagram of the first cycle of the Pulverforderers.
  • the function of the first working cycle can also be described as "creating underpressure" or "building up underpressure”.
  • the inlet valve EV1 which is connected via a powder line with a powder reservoir 30, closed.
  • the outlet valve Av1 which is connected via a powder line 31 with a powder spray gun 32, is closed.
  • the compressed air valve DV1 which is connected via a compressed air line with a compressed air tank 34 and a compressed air pump 33, closed.
  • the negative pressure valve VV1 connected to a negative pressure tank 35 and a vacuum pump 36 is opened. As a result, a negative pressure is generated in the delivery chamber FK1.
  • FIG. 5 a second operating cycle is initiated in FIG. 5 is shown, the vacuum valve VV1 closed and the inlet valve EV1 open.
  • the function of the second cycle can also be described as "aspirate powder”. As a result, the powder flows from the powder reservoir 30 into the delivery chamber FK1.
  • a third working cycle which in FIG. 6 is shown, the inlet valve EV1 closed again.
  • the exhaust valve AV1 and the compressed air valve DV1 are opened so that the powder flows in the direction of the powder spray gun 32 by means of the compressed air injected into the delivery chamber FK1.
  • the function of the third working cycle can also be described as "blow out powder”.
  • FIG. 7 is shown in the form of a block diagram, the powder delivery device with two delivery chambers FK1 and FK2.
  • the control of the valves DV1, VV1, EV1, AV1, DV2, VV2, EV2 and AV2 by means of a controller 45.
  • the controller 45 generates at its outputs S1 to S4 electrical control signals for controlling the electrically operated valves DV1, DV2, VV1 and V V2.
  • the controller 45 controls the two intake valves EV1 and EV2 and the two exhaust valves AV1 and AV2 by means of compressed air.
  • the compressed air tank 34 and the vacuum tank 35 are optional. They serve to relieve the two pumps 33 and 36.
  • the tanks 34 and 35 are particularly helpful when several powder conveyors are connected.
  • the pump 36 for generating the negative pressure for example, an injector, a piston pump, a diaphragm pump or other vacuum generator can be used.
  • the Forder aroma the Fordervoriques can be adjusted, inter alia, on the frequency of the power strokes. Since no damping element, such as a porous sleeve or an air filter is arranged between the delivery chamber FK1 / FK2 and the vacuum valve VV1 / VV2, but only an air duct, the required negative pressure in the delivery chamber FK1 / FK2 is reached very quickly. As a result, if desired, the first power stroke during which the delivery chamber is evacuated can be kept very short in time.
  • no damping element such as a porous sleeve or an air filter
  • the delivery rate is determined by the air pressure used to blow out the powder from the delivery chamber, the amount of negative pressure, the time during which the negative pressure valve is open, the time during which the inlet valve is open, the time duration during which the compressed air valve is open and set for the length of time the outlet valve is open.
  • the volume of the delivery chamber also has an influence on the delivery rate. As a rule, it is favorable to design the delivery chamber oblong.
  • the ratio of diameter to length is preferably between 1: 2 and 1:10. The mentioned parameters can be adjusted by means of the controller 45.
  • the valves can be designed as self-closing valves.
  • the powder conveying device according to the invention is not limited to the embodiment shown in the figures.
  • the intake valves EV1 and EV2 and the exhaust valves AV1 and AV2 may be formed as non-return valves or as ball valves instead of pinch valves.
  • the conveyor device according to the invention can be operated in any spatial orientation.
  • the conveyor can thus be installed both standing and lying depending on the structural conditions.
  • a further advantage of the invention is that the delivery chambers FK1 and FK2 have no dead space, so that the same amount of powder is conveyed with each powder delivery cycle. As a result, a high constancy in the delivery rate can be achieved.
  • the powder delivery rate can be further increased.
  • the powder transport can be made more continuous. Pulsation of the powder flow is avoided.
  • One possibility is, for example, that when the first powder conveyor executes the second power stroke "suction powder", the second powder conveyor performs the first power stroke "build-up of negative pressure".
  • the second Fulverannaer delayed by one clock compared to the first powder conveyor.
  • the second powder conveyor it is also possible for the second powder conveyor to follow the power stroke of the first powder conveyor with two decelerations. That is, when the first powder conveyor performs the third power cycle "blow out powder", the second powder conveyor performs the first "generate negative pressure" power stroke.
  • the control of the two powder conveyors takes place, as already mentioned, by means of the controller 45.

Landscapes

  • Air Transport Of Granular Materials (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Claims (11)

  1. Dispositif destiné à transporter de la poudre,
    - dans lequel est prévue une chambre de transport (FK1), laquelle est disposée entre une soupape d'admission de poudre (EV1) et une soupape de refoulement de poudre (AV1),
    - dans lequel la chambre de transport (FK1) est reliée, à travers un premier canal (8), à une soupape de dépression (VV1), à travers laquelle une dépression peut être générée dans la chambre de transport (FK1), et
    - dans lequel la chambre de transport (FK1) est reliée, à travers un second canal (9), à une soupape pneumatique (DV1), et
    - dans lequel est prévu un troisième canal (10), à travers lequel la chambre de transport (FK1) est reliée à la soupape pneumatique (DV1), et qui est disposé de telle sorte que l'air comprimé (DL) est soufflé en direction de la soupape d'admission de poudre (EV1) à travers le troisième canal (10).
  2. Dispositif selon la revendication 1,
    dans lequel de second canal (9) est disposé face au premier canal (8).
  3. Dispositif selon la revendication 1 ou 2,
    dans lequel la soupape pneumatique (DV1) et la soupape de dépression (VV1) sont formées comme électrovannes.
  4. Dispositif selon une des revendications de 1 à 3,
    dans lequel la soupape de dépression (VV1) est reliée à un générateur de vide (29).
  5. Dispositif selon une des revendications de 1 à 4,
    dans lequel la soupape de dépression (VV1) est reliée à un réservoir à dépression (28).
  6. Dispositif selon une des revendications de 1 à 5,
    dans lequel la soupape d'admission (EV1) et la soupape de refoulement (AV1) sont formées comme soupape de gonflage.
  7. Dispositif selon une des revendications de 1 à 6,
    dans lequel la chambre de transport (FK1) est formée en tant que canal droit et la soupape d'admission (EV1) est disposée à une extrémité du canal droit et la soupape de refoulement (AV1) est disposée à l'autre extrémité du canal droit.
  8. Procédé de transport de poudre avec un dispositif selon une des revendications de 1 à 7, qui comprend les phases de travail suivantes:
    - dans une première phase de travail une dépression est générée dans la chambre de transport (FK1),
    - ensuite, dans une seconde phase de travail, la poudre est aspirée dans la chambre de transport (FK1), et
    - ensuite, dans une troisième phase de travail, la poudre est soufflée hors de la chambre de transport (FK1).
  9. Procédé selon la revendication 8,
    - dans lequel, dans une première phase de travail, la soupape d'admission (FV1) et la soupape de refoulement (AV1) sont fermées et la soupape de dépression (VV1) est ouverte,
    - dans lequel, dans une seconde phase de travail, la soupape de dépression (VV1) est fermée et la soupape d'admission (EV1) est ouverte, et
    - dans lequel, dans une troisième phase de travail, la soupape d'admission (EV1) est fermée et la soupape de refoulement (AV1) et la soupape pneumatique (DV1) est ouverte.
  10. Procédé de transport de poudre avec deux des dispositifs selon une des revendications de 1 à 9,
    dans lequel les phases de travail des deux dispositifs sont exécutées de manière décalée dans le temps l'une par rapport à l'autre.
  11. Procédé selon une des revendications de 1 à 10,
    dans lequel la capacité de transport est réglée à travers la fréquence des phases de travail, de la pression de l'air soufflé, de la dépression, du temps d'ouverture de la soupape de dépression (VV1), du temps d'ouverture de la soupape d'admission (EV1) et/ou du volume de la chambre de transport (FK1).
EP05017597A 2005-08-12 2005-08-12 Dispositif et procédé pour transporter de la poudre Not-in-force EP1752399B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP05017597A EP1752399B1 (fr) 2005-08-12 2005-08-12 Dispositif et procédé pour transporter de la poudre
AT05017597T ATE421477T1 (de) 2005-08-12 2005-08-12 Vorrichtung und methode zum fördern von pulver
DE502005006537T DE502005006537D1 (de) 2005-08-12 2005-08-12 Vorrichtung und Methode zum Fördern von Pulver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05017597A EP1752399B1 (fr) 2005-08-12 2005-08-12 Dispositif et procédé pour transporter de la poudre

Publications (2)

Publication Number Publication Date
EP1752399A1 EP1752399A1 (fr) 2007-02-14
EP1752399B1 true EP1752399B1 (fr) 2009-01-21

Family

ID=35501113

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05017597A Not-in-force EP1752399B1 (fr) 2005-08-12 2005-08-12 Dispositif et procédé pour transporter de la poudre

Country Status (3)

Country Link
EP (1) EP1752399B1 (fr)
AT (1) ATE421477T1 (fr)
DE (1) DE502005006537D1 (fr)

Families Citing this family (11)

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Publication number Priority date Publication date Assignee Title
DE202007018809U1 (de) 2007-08-31 2009-05-14 Itw Gema Gmbh Pulversprühbeschichtungsvorrichtung und Beschichtungspulver-Fördervorrichtung dafür
DE102007046738A1 (de) 2007-09-28 2009-04-02 Itw Gema Gmbh Pulversprühbeschichtungsverfahren und -vorrichtung
DE102007049219A1 (de) 2007-10-13 2009-04-16 Itw Gema Gmbh Pulverfördervorrichtung für Pulversprühbeschichtungsvorrichtungen
BR112015024418B8 (pt) 2013-04-03 2021-03-23 Gema Switzerland Gmbh esteira transportadora de pó e método para operar uma esteira transportadora de pó
DE102013205895A1 (de) 2013-04-03 2014-10-09 Gema Switzerland Gmbh Pulverdichtstrompumpe zum Fördern von Beschichtungspulver sowie entsprechendes Verfahren
DE102014105044A1 (de) 2014-04-09 2015-10-15 Gema Switzerland Gmbh System zum Fördern von Beschichtungspulver und Verfahren zum Betreiben eines solchen Systems
DE102015108492A1 (de) 2015-05-29 2016-12-01 Gema Switzerland Gmbh Verfahren zum Betreiben einer Pulverdichtstrompumpe sowie Pulverdichtstrompumpe
DE102017103487A1 (de) * 2017-02-21 2018-08-23 Gema Switzerland Gmbh Pulverdichtstrompumpe
EP3552714B1 (fr) * 2018-04-12 2021-02-17 Wagner International Ag Transporteur de poudre destiné à transporter le poudre de revêtement, méthode de fabriquation de transportateur et centre d'alimentation en poudre pourvu de transporteur de poudre destiné à alimenter un centre d'alimentation en poudre
DE102021117798A1 (de) 2021-07-09 2023-01-12 Gema Switzerland Gmbh Pulverförderkammer für eine pulverdichtstrompumpe sowie pulverdichtstrompumpe mit einer pulverförderkammer
CN114669513A (zh) * 2022-05-16 2022-06-28 安徽中科光电色选机械有限公司 一种负压发生装置及色选机

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DE2437799C3 (de) * 1974-08-06 1980-09-04 Spitzer Silo- Fahrzeuge Kg, 6950 Mosbach Pneumatische Fördervorrichtung mit mindestens einer Absaug- und Druckfördereinrichtung
DE20321762U1 (de) 1988-05-11 2009-08-27 H. Börger & Co. GmbH Vorrichtung zum Fördern von pulverförmigem Material
DE19959468A1 (de) * 1999-12-10 2001-06-21 Frederic Dietrich Vorrichtung und Verfahren zum pneumatischen Fördern pulverförmiger Stoffe sowie Verwendung der Vorrichtung
DE10121934A1 (de) * 2001-05-05 2002-11-07 Linde Ag Verfahren zum pneumatischen Fördern pulverförmiger Stoffe und dessen Anwendung beim Kaltgasspritzen
US20050158187A1 (en) 2003-11-24 2005-07-21 Nordson Corporation Dense phase pump for dry particulate material
DE102004007967A1 (de) * 2004-02-18 2005-09-08 Dürr Systems GmbH Pulverförderpumpe und zugehöriges Betriebsverfahren

Also Published As

Publication number Publication date
DE502005006537D1 (de) 2009-03-12
ATE421477T1 (de) 2009-02-15
EP1752399A1 (fr) 2007-02-14

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