EP2059346A1 - Pompe de transport de poudre pour le transport de poudre de revetement dans une installation de revetement par poudre et procede d'utilisation correspondant - Google Patents

Pompe de transport de poudre pour le transport de poudre de revetement dans une installation de revetement par poudre et procede d'utilisation correspondant

Info

Publication number
EP2059346A1
EP2059346A1 EP07802094A EP07802094A EP2059346A1 EP 2059346 A1 EP2059346 A1 EP 2059346A1 EP 07802094 A EP07802094 A EP 07802094A EP 07802094 A EP07802094 A EP 07802094A EP 2059346 A1 EP2059346 A1 EP 2059346A1
Authority
EP
European Patent Office
Prior art keywords
powder
chamber
coating
feed pump
container
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Withdrawn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
EP07802094A
Other languages
German (de)
English (en)
Inventor
Marcus Treppschuh
Hans-Georg Fritz
Thomas Dürr
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.)
Duerr Systems AG
Original Assignee
Duerr Systems 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 Duerr Systems AG filed Critical Duerr Systems AG
Publication of EP2059346A1 publication Critical patent/EP2059346A1/fr
Withdrawn legal-status Critical Current

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
    • B05B7/1463—Arrangements for supplying particulate material the means for supplying particulate material comprising a gas inlet for pressurising or avoiding depressurisation of a powder container

Definitions

  • the invention relates to a powder feed pump for conveying coating powder in a powder coating plant and a corresponding operating method according to the juxtaposed claims.
  • a powder feed pump which can be used in a powder coating plant to convey coating powder from a powder source, such as a so-called big bag emptying station, to an application device, such as a powder bell atomizer ,
  • a disadvantage of this known powder feed pump is the fact that it must be supplied with screened powder coating. For this reason, conventional powder coating plants have separate powder sieves, which are arranged in front of the powder feed pump.
  • the invention is therefore based on the object to improve the known powder feed pump described above accordingly.
  • the invention comprises the general technical teaching of integrating a sieve into the powder feed pump in order to obtain the coating. sieve powder in the powder feed pump, so that can be dispensed with a separate powder sieve.
  • Such integration of a sieve is not possible with the above-described known powder feed pump according to EP 1 454 675 A2, because a powder withdrawal tube protrudes from the top into the powder container up to its bottom, thereby preventing the installation of a sieve.
  • the powder feed pump according to the invention thus combines two functions, namely, on the one hand a pump functionality and, on the other hand, a screen functionality.
  • the powder feed pump according to the invention preferably has a third function in that the coating powder is fluidized in the powder feed pump.
  • the powder feed pump has a pressure-resistant powder container with an inlet chamber and an outlet chamber, between which the sieve is arranged.
  • the pressure resistance of the powder container in this case need not be particularly great, but merely sufficient to blow out the coating powder contained in the powder container, for which a compressive strength of about 0.8 bar is sufficient.
  • the pressure resistance of the powder container in the powder feed pump according to the invention is therefore preferably greater than 0.5 bar, 0.8 bar, 1 bar, 2 bar or even greater than 5 bar.
  • the powder container has a powder inlet, which opens into the inlet chamber of the powder container for supplying the coating powder.
  • the powder feed pump in this embodiment has a powder outlet, which opens out of the outlet chamber of the powder container, to dispense the coating powder.
  • a compressed air connection is provided, which opens into the powder container to blow the coating powder through the powder outlet from the powder container, the compressed air connection preferably opens into the outlet chamber of the powder container.
  • the inlet chamber of the powder container is first filled via the powder inlet.
  • the coating powder in the inlet chamber is then screened through the screen into the outlet chamber.
  • the coating powder located in the outlet chamber of the powder container can then be blown out through the powder outlet from the outlet chamber of the powder container by blowing compressed air into the powder container via the compressed air connection.
  • the conventional powder feed pump according to EP 1 454 675 A2 has a discharge tube as a powder outlet, which protrudes into the powder container from above and only ends shortly above the bottom of the powder container in order to remove fluidized coating powder there.
  • this sampling tube prevents the integration of a sieve in the powder feed pump, since the sampling tube would have to go through the sieve.
  • the powder outlet is therefore preferably arranged in the inlet chamber in the wall of the powder container, so that it is possible to dispense with a removal tube. This offers the advantage that the interior of the powder container remains free without interference from a sampling tube, which allows the integration of the sieve.
  • the powder outlet can be arranged laterally in the wall of the powder container in the region of the inlet chamber.
  • a compressed air connection is to be understood in general and not limited to the use of atmospheric air for blowing out the coating powder. Rather, other gases can be supplied via the compressed air connection. In conventional painting but usually compressed air lines are available, which can also be used for the powder feed pump according to the invention.
  • the inlet chamber and the outlet chamber of the powder container respectively directly adjoin the screen. This means that the sieve is arranged directly between the inlet chamber and the outlet chamber.
  • an additional central chamber is arranged between the inlet chamber and the outlet chamber of the powder container, wherein the sieve is arranged between the central chamber and the outlet chamber, while a controllable valve connects the inlet chamber with the central chamber.
  • the transfer of the coating powder from the inlet chamber into the middle chamber preferably takes place so slowly that the sieve is not overloaded.
  • the transfer of the coating powder The inlet chamber into the middle chamber is therefore preferably slower than the filling of the inlet chamber itself.
  • the filling of the inlet chamber may be intermittent, whereas the transfer of the coating powder from the inlet chamber into the central chamber takes place continuously or in smaller increments.
  • the inlet chamber and / or the middle chamber of the powder container is preferably arranged above the sieve, while the outlet chamber of the powder container is preferably arranged below the sieve.
  • the individual chambers of the powder container are thus preferably arranged above one another.
  • the invention is not limited to embodiments in which the individual chambers of the powder container are arranged one above the other.
  • the powder feed pump according to the invention preferably has a conventional fluid bottom in order to fluidize the coating powder.
  • a fluid floor is known, for example, from patent application EP 1 454 675 A2, already mentioned at the outset, and from patent application DE 10 2005 024 854, so that the content of these two patent applications is to be fully attributed to the present description with regard to the structural design of the fluid floor ,
  • the powder feed pump according to the invention preferably has a balance to measure the weight of the powder container with the coating powder therein. Such a weight measurement advantageously makes it possible to determine the mass of the coating powder in the powder container.
  • the powder container is therefore preferably mounted on a balance in the powder feed pump according to the invention. It is also within the scope of the invention to provide a level sensor which measures the level of the coating powder in the powder container, wherein the level sensor is preferably arranged in the inlet chamber of the powder container and measures the level in the inlet chamber of the powder container.
  • the sieve integrated in the powder feed pump is angular and thus has an angular sieve surface, which is known per se from the patent application DE 10 2005 024 854.
  • the screen is preferably designed as an ultrasound screen and has an ultrasound transmitter in order to excite the screen surface to ultrasonic vibrations.
  • the invention is not limited to ultrasound sieves with regard to the sieve type, but in principle can also be implemented with other sieve types which allow sieving of the coating powder.
  • controllable valves can be used within the scope of the invention.
  • pinch valves are used in the invention, which are preferably pneumatically controllable.
  • the invention is not limited to a powder feed pump as a single component, but also includes a powder coating system with a powder feed pump according to the invention.
  • the powder feed pump according to the invention is connected on the input side to a powder source, which is, for example, a so-called big-bag emptying station, a Powder container emptying station or a powder feed pump can act, the powder feed pump can be configured for example as a DDF pump (DDF: digital dense phase promotion) or as a vacuum feed pump.
  • DDF digital dense phase promotion
  • the connection of the powder feed pump according to the invention with the powder source is preferably carried out without the interposition of another sieve and / or without the interposition of another pump, which makes possible a simplification of the powder coating system according to the invention.
  • the invention is not limited to those powder coating systems in which upstream of the powder feed pump according to the invention is dispensed with a sieve or a pump. Rather, within the scope of the invention it is also possible to arrange an additional screen and / or an additional pump upstream of the powder feed pump according to the invention.
  • the powder feed pump according to the invention is preferably connected directly to an application device, such as a Pulverglockenzerstäuber.
  • an application device such as a Pulverglockenzerstäuber.
  • An advantage of this construction is the fact that the sieve is arranged as the last component directly in front of the appli- cation device, whereby the painting result is improved.
  • the powder feed pump is connected on the outlet side to an application container which feeds an application device, such as a powder bell atomizer.
  • an application device such as a powder bell atomizer.
  • the invention is not limited to such powder coating systems in which downstream of the powder feed pump according to the invention no additional sieve and no additional pump is arranged. Rather, it is also possible within the scope of the invention for an additional screen and / or an additional pump to be arranged downstream of the powder feed pump according to the invention.
  • the invention also encompasses a novel method of operating a powder feed pump, the coating powder in the powder feed pump being screened through an integrated sieve within the scope of the operating method according to the invention.
  • FIG. 1 shows a preferred embodiment of a powder feed pump according to the invention with an integrated sieve which separates an inlet chamber from an outlet chamber,
  • FIG. 2 shows an alternative exemplary embodiment of a powder feed pump according to the invention, in which a middle chamber is arranged between the inlet chamber and the outlet chamber,
  • FIG. 3A shows a schematic representation of a powder coating installation according to the invention with a powder conveying pump according to FIG. 1, wherein the powder feed pump is connected on the input side to a big bag emptying station and on the output side directly to an applicator,
  • FIG. 3B shows a modification of the exemplary embodiment according to FIG. 3A, in which the powder feed pump is connected to the applicator on the output side via an application container,
  • FIG. 3C shows a modification of the embodiment according to FIG. 3A, in which the powder feed pump is connected to a powder container on the input side via a DDF pump,
  • Figure 3D shows an alternative embodiment of a powder coating system according to the invention, in which the powder feed pump is connected on the input side via a DDF pump with a powder container and the output side via an application container with an applicator and
  • FIG. 4 shows the operating method of the powder feed pump according to FIG. 2 in the form of a flow chart.
  • FIG. 1 shows a powder feed pump 1 that can be used in a powder coating plant to convey coating powder from a powder source, such as a so-called big bag emptying station, to an applicator, such as a powder bell atomizer.
  • a powder source such as a so-called big bag emptying station
  • an applicator such as a powder bell atomizer.
  • the powder feed pump 1 has a powder container 2 with an inlet chamber 3 and an outlet chamber 4, wherein the Inlet chamber 3 is arranged above the outlet chamber 4 and is separated from the outlet chamber 4 by a sieve 5.
  • the outlet chamber 4 of the powder container 2 opens via a pneumatically controllable pinch valve QV2 a Druck Kunststoffan gleich 7, can be injected via the compressed air into the outlet chamber 4.
  • the compressed air connection 7 is fed by the already existing compressed air line of the paint shop with compressed air.
  • the bottom of the outlet chamber 4 consists in a conventional manner of a semi-permeable fluid tray 9, which is permeable to compressed air, but impermeable to the coating powder.
  • a fluidization chamber 10 into which a compressed air connection 11 opens via a pneumatically controllable pinch valve QV4.
  • the compressed air connection 11 is also supplied with compressed air by the already existing compressed air line of the painting installation.
  • the pinch valve QV4 is opened and compressed air is introduced into the fluid. blown idmaschineshunt 10. From the fluidization chamber 10, the compressed air then enters the outlet chamber 4 through the semi-permeable fluid base 9 and fluidises the coating powder located there.
  • the powder feed pump 1 On its underside, the powder feed pump 1 according to the invention rests on a balance 12, wherein the balance 12 measures the weight of the powder container 2 with the coating powder contained therein. This weight measurement makes it possible to determine the mass of the coating powder located in the powder container 2.
  • the pinch valve QV1 is opened in order to introduce coating powder into the inlet chamber 3 of the powder container 2 via the powder inlet 6.
  • the coating powder located in the inlet chamber 3 is then sieved through the sieve 5 into the outlet chamber 4 of the powder container 2 and fluidized there by opening the pinch valve QV4, so that compressed air via the compressed air connection 11 and the semipermeable fluid tray 9 into the inlet chamber 4 of the powder container 2 is blown.
  • the two pinch valves QV2 and QV3 are then opened, so that compressed air is blown into the outlet chamber of the powder container 2 via the compressed air connection 7.
  • the fluidized coating powder is displaced from the outlet chamber 4 of the powder container 2 and blown out of the outlet chamber 4 through the powder outlet 8.
  • the interior of the powder container 2 can be vented through a vent valve, wherein the vent valve is not shown for simplicity.
  • FIG. 2 shows an alternative exemplary embodiment of a powder feed pump 1 according to the invention, which largely corresponds to the exemplary embodiment according to FIG. 1, so that reference is made to the above description to avoid repetition, the same reference numerals being used below.
  • a special feature of this embodiment is that between the inlet chamber 3 and the outlet chamber 4 of the powder container 2, a central chamber 13 is arranged.
  • the middle chamber 13 is separated from the outlet chamber 4 of the powder container 2 by the sieve 5 and is connected to the inlet chamber 3 by another pneumatically controllable pinch valve QV5.
  • the coating powder thus does not reach the screen 5 immediately, but only when the pinch valve QV5 is opened. This is particularly advantageous if the filling with coating powder intermittently in large quantities, since the respectively supplied amounts of coating powder could overload the screen 5.
  • FIG. 3A schematically shows an exemplary embodiment of a powder coating installation according to the invention with the powder feed pump 1 according to FIG. 1.
  • the powder feed pump 1 according to FIG Figure 2 are used.
  • the powder feed pump 1 is connected here via the pinch valve QV1 to a conventional big-bag emptying station 14, wherein neither an additional sieve nor an additional pump is arranged between the big-bag emptying station 14 and the powder feed pump 1.
  • the powder feed pump 1 is connected directly to an applicator 15 via the pinch valve QV3, wherein the applicator 15 may be formed, for example, as a powder bell atomizer.
  • the applicator 15 may be formed, for example, as a powder bell atomizer.
  • the control of the pinch valves QV1-QV4 is carried out by a control unit 16 via pneumatic control lines, which are shown in dashed lines in the drawing.
  • a compressed air source 17 which may be a compressed air ring line, which is available anyway in conventional paint shops.
  • FIG. 3B shows a modification of the exemplary embodiment according to FIG. 3A, so that reference is made to the above description to avoid repetition, the same reference numerals being used for corresponding components.
  • a special feature of this embodiment is that the powder feed pump 1 is not directly connected to the applicator 15, but with the interposition of an application container 18th
  • the embodiment according to FIG. 3C largely corresponds to the exemplary embodiment described above and illustrated in FIG. 3A, so that reference is made to the above description to avoid repetition, the same reference numerals being used for corresponding components.
  • a special feature of this embodiment is that the powder feed pump 1 on the input side via a DDF
  • FIG. 3D shows a combination of the input-side supply of the powder feed pump 1 according to FIG. 3C with an outlet-side connection according to FIG. 3B.
  • a first step Sl the pinch valve QVl is opened while the pinch valves QV2-QV5 are closed.
  • the inlet chamber 3 of the powder container 2 is then filled with coating powder via the powder inlet 6 and the opened pinch valve QV1, wherein this filling can also occur intermittently in large quantities, since the filled coating powder does not start immediately due to the closed pinch valve QV5 gets on the sieve 5, whereby an overload of the sieve 5 could occur.
  • the pinch valve QVl is then closed in a step S3, while the pinch valve QV5 is slowly opened to gradually transfer the coating powder filled into the inlet chamber 3 into the center chamber 13.
  • the coating powder transferred into the middle chamber 13 of the powder container 2 is then screened through the sieve 5 into the outlet chamber 4 of the powder container 2 in a further step S5.
  • the pinch valve QV5 is then closed in a step S6 while the pinch valve QV4 is opened so that the compressed air injected into the outlet chamber 4 through the semipermeable fluid tray 9 fluidizes the coating powder in a further step S7.
  • step S8 the two pinch valves QV2 and QV3 are then opened, so that compressed air is blown into the outlet chamber 4 of the powder container 2, whereby the fluidized coating powder located in the outlet chamber 4 is opened via the open pinch valve QV3 and the powder outlet 8 is blown out, which takes place in a further step S9.

Landscapes

  • Coating Apparatus (AREA)
  • Nozzles (AREA)

Abstract

La présente demande concerne une pompe (1) de transport de poudre qui transporte de la poudre de revêtement dans une installation de revêtement par poudre. Elle présente un tamis (5) intégré pour tamiser la poudre de revêtement. La demande concerne en outre un procédé d'utilisation correspondant.
EP07802094A 2006-09-05 2007-09-03 Pompe de transport de poudre pour le transport de poudre de revetement dans une installation de revetement par poudre et procede d'utilisation correspondant Withdrawn EP2059346A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610041527 DE102006041527A1 (de) 2006-09-05 2006-09-05 Pulverförderpumpe und zugehöriges Betriebsverfahren
PCT/EP2007/007679 WO2008028613A1 (fr) 2006-09-05 2007-09-03 pompe de transport de poudre pour le transport de poudre de revêtement dans une installation de revêtement par poudre et procédé d'utilisation correspondant

Publications (1)

Publication Number Publication Date
EP2059346A1 true EP2059346A1 (fr) 2009-05-20

Family

ID=38670760

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07802094A Withdrawn EP2059346A1 (fr) 2006-09-05 2007-09-03 Pompe de transport de poudre pour le transport de poudre de revetement dans une installation de revetement par poudre et procede d'utilisation correspondant

Country Status (3)

Country Link
EP (1) EP2059346A1 (fr)
DE (1) DE102006041527A1 (fr)
WO (1) WO2008028613A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2218514B1 (fr) 2009-02-09 2017-04-26 J. Wagner AG Dispositif d'alimentation de poudre de revêtement
DE102011017290A1 (de) * 2011-04-15 2012-10-18 Ucon Ag Containersysteme Kg Dosierorgan und Dosierverfahren
DE102015117070A1 (de) * 2015-10-07 2017-04-13 M-Tec Mathis Technik Gmbh Verfahren und Fördervorrichtung zur Förderung eines Mediums

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AT168231B (de) * 1949-11-23 1951-05-10 Leo Christian Pulverzerstäuber
DE805207C (de) * 1949-12-06 1951-05-10 Hanns Klasen Verstaeuber fuer pulverfoermige Stoffe
US3960323A (en) * 1971-11-02 1976-06-01 Nordson Corporation Powder spray system
US4704953A (en) * 1986-11-12 1987-11-10 Nordson Corporation Powder spray system
DE3742466C2 (de) * 1987-12-15 1993-12-02 Vorwerk Co Interholding Mischeinrichtung in Sprühdosen zur Durchmischung feststoffhaltiger Suspensionen
DE4013061A1 (de) * 1990-04-24 1991-11-14 Metri Airfluid Ag Einrichtung zum fluidisieren von in einem behaelter befindlichen pulver und abfuehren fluidisierten pulvers unmittelbar zu einer spruehpistole einer elektrostatischen pulverbeschichtungsanlage
DE4105663A1 (de) * 1991-02-22 1992-09-03 Metri Airfluid Ag Einrichtung zum speisen eines elektrostatischen pulverbeschichtungsgeraets mit einem pulver-luft-strom
DE10261292B4 (de) * 2002-12-27 2006-09-14 Eisenmann Maschinenbau Gmbh & Co. Kg Vorlagebehälter für pulverförmige Medien
DE10304892B3 (de) * 2003-02-06 2004-08-19 Dürr Systems GmbH Betriebsverfahren für eine Pulverversorgungseinrichtung
US7273339B2 (en) * 2003-03-07 2007-09-25 Haden Schweitzer Corporation Powder transport method and apparatus
DE102005024854B3 (de) * 2005-05-31 2006-09-14 Dürr Systems GmbH Beschichtungspulver-Siebeinrichtung
DE202006005754U1 (de) * 2006-04-06 2006-06-08 J. Wagner Ag Sieb für eine Vorrichtung zum Beschichten von Werkstücken mit Beschichtungspulver

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
DE102006041527A1 (de) 2008-03-27
WO2008028613A1 (fr) 2008-03-13

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