EP0703832B1 - Zuführungs-vorrichtung und verfahren einer spritzanlage für ein pulverförmiges material - Google Patents

Zuführungs-vorrichtung und verfahren einer spritzanlage für ein pulverförmiges material Download PDF

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Publication number
EP0703832B1
EP0703832B1 EP94917032A EP94917032A EP0703832B1 EP 0703832 B1 EP0703832 B1 EP 0703832B1 EP 94917032 A EP94917032 A EP 94917032A EP 94917032 A EP94917032 A EP 94917032A EP 0703832 B1 EP0703832 B1 EP 0703832B1
Authority
EP
European Patent Office
Prior art keywords
product
powder
plant
temperature
tank
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.)
Expired - Lifetime
Application number
EP94917032A
Other languages
English (en)
French (fr)
Other versions
EP0703832A1 (de
Inventor
Adrien Lacchia
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.)
Sames SA
Original Assignee
Sames SA
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Filing date
Publication date
Application filed by Sames SA filed Critical Sames SA
Publication of EP0703832A1 publication Critical patent/EP0703832A1/de
Application granted granted Critical
Publication of EP0703832B1 publication Critical patent/EP0703832B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B05B7/144—Arrangements for supplying particulate material the means for supplying particulate material comprising moving mechanical means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S198/00—Conveyors: power-driven
    • Y10S198/952—Heating or cooling

Definitions

  • the invention relates to a method for feeding a powder spraying installation. in particular a powder coating product. It relates to also a device for supplying an installation for projecting such a product powdery.
  • the powdery product usually called “powder” is brought from a product tank to its point of use, for example a projector of the type pneumatic or centrifugal.
  • the powder is entrained thanks to an air jet in a long duct, often tortuous and relatively small in diameter.
  • the powder feed is continuous, homogeneous, stable for an extended period and adjustable with precision and speed.
  • a Venturi-type suction device we can use a Venturi-type suction device.
  • a worm or Archimedes screw mounted at the bottom of a hopper, leading to a nozzle supplied with drive air by an injector.
  • Such system has advantages over a device powder suction, in particular due to the regularity of mass flow of powder despite losses variable loads.
  • the powders used are generally intended for be cooked to around 180 ° C after being applied. Gold, it has been noted that this cooking phase causes yellowing some powders. New powders have been added point which only require cooking about 140 ° C. This solves the problem of yellowing but introduces an additional constraint because these powders change quickly at room temperature. They should be stored at low temperatures, preferably between 5 ° C and 10 ° C. Furthermore, the point polymerization of these powders is low and they risk to polymerize in places where the temperature tends to be elevated, such as around the worm a system with mechanical drive. It is necessary that keep only the powder consumed in one less time than that beyond which the powder deteriorated. This requires frequent refills of the tank.
  • the powder must travel a relatively long way of the order of ten meters for example, in the conduit located between the supply device and the projector with which it is associated. The friction in this can raise the temperature of the powder and the deteriorate or polymerize it.
  • the tank and the associated drive system necessarily contain powder remnants. They must be completely emptied powder and it should be stored in a place cool and dry such as a refrigerator for the duration of stopping the installation. It is imperative to clean very carefully the tank and the auger because, if powder stays there for an extended period of time, may deteriorate and clump together, for example the along the worm, which would be inconvenient when restarting the device. This requires maneuvers long, tedious and frequent.
  • One of the essential advantages of coating with a powdery product is that the product that has not reached the target, i.e. the object to be painted, can be recycled thanks to an appropriate device to recover the powder in the cabin and to a transport device this powder recovered to the feed device powder from the facility where it is mixed with new powder.
  • the powder undergoes heating during projection, if its temperature at the outlet of the device is too high, so it may not be recoverable.
  • the powder recovered may to raise the temperature of the new powder when mixing even if it was stored in a refrigerator until it is poured into the fuel system tank.
  • the invention solves all of these problems.
  • It relates to a method of feeding a powder spraying installation such as in particular a powder coating product characterized in what we cool said product inside the product supply device for said product installation.
  • the temperature of the powder is maintained below 15 ° C, preferably between 5 ° C and 10 ° C.
  • the powder is collected in the cabin, it is quickly brought back to the right temperature as soon as it returns to the tank.
  • the temperature in a coating workshop can vary significantly, for example depending on the season.
  • the mechanical and chemical properties of the powder vary according to this temperature: it will be more or less "sticky", and will agglomerate more or less depending on the temperature. Thanks to the process of the invention, the powder is used under optimal conditions throughout the year.
  • the invention also relates to a device supply of a product projection installation powder, such as for example a coating product powder, comprising a reservoir and a mechanical member transport, characterized in that it comprises means for cooling the powdery product.
  • a product projection installation powder such as for example a coating product powder
  • the device of Figure 1 comprises a tank 1 fluidized powder whose bottom consists of a porous plate 2 through which a gas is injected such as air to fluidize the powder and entrain it towards an opening 3.
  • the latter is practiced in the bottom of the tank 1 and is extended by a body 6 forming hopper in which an endless screw is installed 4 driven by a motor 5, for example a motor electric.
  • the body 6 comprises, in its lower part, a drain opening closed by a removable plug 8.
  • a vibrator 9 is mounted on the body 6, outside of it. During the phases of use of the device, the assembly constituted by the tank 1 and the body 6 is thus vibrated.
  • a thermal seal 5 ' is placed between the motor 5 and the worm screw 4.
  • the device also includes a drive nozzle 10 connected to the outlet of the sleeve 7 and comprising a injector 11 supplied with air by a supply duct compressed air 14 connected to a control panel 13.
  • the compressed air source and possibly the regulator required are not shown.
  • the nozzle outlet 10 is connected to a flexible conduit 15 supplying powder an electrostatic spotlight 16, for example automatic.
  • a non-return valve 20 pneumatically controlled on opening by a piston 22 and requested to close by a spring 21 bearing on said piston.
  • the powder recovered in the cabin (not shown) of the installation and intended for recycling is returned to the supply device by a conduit whose arrival 35 opens at the top of the tank 1.
  • the fluidizing air from reservoir 1 is supplied to a distribution chamber 23, located under the porous plate 2, by a dry air supply 24, through a duct 25.
  • the dew point of the air supplied for fluidization is 2 ° C and this air is cold, i.e. at temperature below 15 ° C, preferably between 5 ° C and 10 ° C.
  • the temperature of the powder in the tank 1 is thus kept at a low value independent of external temperature conditions which may vary strongly from one season to another.
  • a heat exchanger 30 feeds, through a duct 31, in cold water or freon, a room annular 32 defined around the sleeve 7. This device allows to cool the sheath 7 and the powder which is located inside.
  • the circuit constituted by the conduit 31 and the chamber 32 is not not closed directly on the heat exchanger 30 but also includes a coil 33 housed in the hopper, at below opening 3, i.e. on the path of the powder falling from the reservoir l onto the worm screw 4.
  • a return line 34 closes the cooling circuit of the exchanger 30.
  • the powder located in the body 6 is constantly kept at a fairly low temperature so that its conservation is not too noticeably limited in time.
  • the air injected into the duct 14 is at a temperature low, for example close to that of the air used for fluidize the powder in the reservoir 1.
  • This air can be supplied by food 24. So the powder that was cooled in the feeder is kept at an adequate temperature until its arrival in the projector 16.
  • the worm 104 shown in Figure 2 comprises, in its axial part, two channels 105 and 106 of circulation of a cooling fluid supplied by a unit similar to the heat exchanger 30 of FIG. 1.
  • the channel 105 communicates with an axial rotary joint 107 mounted at one end of the screw, while the channel 106 opens out by radial drilling in an annular chamber 108 defined in the vicinity of this same end of the screw around a cylindrical portion thereof. Seals are provided at the interfaces of the moving parts in contact to ensure the necessary sealing of the circuit coolant circulation.
  • the two channels 105 and 106 meet at the other end of the screw without end 104 in a widening closed by a plug 110. This device keeps the worm 104, and especially its fins at a temperature low enough to avoid polymerization of the powder on the fins.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Claims (13)

  1. Verfahren zur Versorgung einer Spritzanlage für ein pulverförmiges Material, wie beispielsweise ein pulverförmiges Beschichtungsmaterial,
    dadurch gekennzeichnet,
    daß man das Material im Inneren der Versorgungsvorrichtung für das Material der Anlage abkühlt (24,30).
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man das Material auf einer Temperatur geringer als 15°C hält, vorzugsweise zwischen 5°C und 10°C.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das gekühlte pulverförmige Material eine Mischung aus neuem Material und ein durch die Anlage recyceltes Material ist.
  4. Versorgungsvorrichtung einer Spritzanlage für ein pulverförmiges Material, wie beispielsweise ein pulverförmiges Beschichtungsmaterial mit einem Behälter (1 und einem mechanischen Transportelement,
    dadurch gekennzeichnet,
    daß sie Mittel zum Abkühlen (23,24,25,30,31,32,33,34,105,106) des pulverförmigen Materials aufweist.
  5. Versorgungsvorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Mittel zum Abkühlen einen in geschlossener Schleife vorgesehenen Zirkulationskreis für ein Kühlfluid (30,31,32,33,34) aufweist.
  6. Versorgungsvorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß der Kreis in geschlossener Schleife eine Ringkammer (32) um das mechanische Transportelement (4) aufweist.
  7. Versorgungsvorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß der Kreis in geschlossener Schleife eine Schlange (33) aufweist, die auf dem Weg des pulverförmigen Materials zwischen dem Behälter und dem mechanischen Element angeordnet ist.
  8. Versorgungsvorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß das mechanische Transportelement eine Endlosschraube (4) ist, in deren Innerem zwei Kanäle (105,106) für die Zirkulation eines Kühlfluids vorgesehen ist.
  9. Versorgungsvorrichtung nach einem der Ansprüche 5 bis 8, dadurch gekennzeichnet, daß das Fluid Wasser oder Freon ist.
  10. Versorgungsvorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Abkühlvorrichtung einen Fluidisierungskreis (23,24,25) des pulverförmigen Materials aufweist, der in dem durch ein Gas mit gesteuerter Temperatur versorgten Behälter (1) angeordnet ist.
  11. Versorgungsvorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß sie eine Düse (10) mit einem Führungsgas mit gesteuerter Temperatur umfaßt.
  12. Versorgungsvorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß sie eine thermische Dichtung zwischen dem mechanischen Transportelement (4) und seinen Antriebsmitteln (5) aufweist.
  13. Versorgungsvorrichtung nach einem der Ansprüche 4 bis 12, dadurch gekennzeichnet, daß sie eine Zuführung (35) für das recycelte Material in die Anlage aufweist.
EP94917032A 1993-05-24 1994-05-19 Zuführungs-vorrichtung und verfahren einer spritzanlage für ein pulverförmiges material Expired - Lifetime EP0703832B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9306137 1993-05-24
FR9306137A FR2705591B1 (fr) 1993-05-24 1993-05-24 Procédé et dispositif d'alimentation d'une installation de projection de produit pulvérulent.
PCT/FR1994/000592 WO1994027731A1 (fr) 1993-05-24 1994-05-19 Procede et dispositif d'alimentation d'une installation de projection de produit pulverulent

Publications (2)

Publication Number Publication Date
EP0703832A1 EP0703832A1 (de) 1996-04-03
EP0703832B1 true EP0703832B1 (de) 1998-01-28

Family

ID=9447355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94917032A Expired - Lifetime EP0703832B1 (de) 1993-05-24 1994-05-19 Zuführungs-vorrichtung und verfahren einer spritzanlage für ein pulverförmiges material

Country Status (8)

Country Link
US (1) US5836722A (de)
EP (1) EP0703832B1 (de)
BR (1) BR9406276A (de)
CA (1) CA2161963C (de)
DE (1) DE69408318T2 (de)
ES (1) ES2112544T3 (de)
FR (1) FR2705591B1 (de)
WO (1) WO1994027731A1 (de)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69132062T2 (de) * 1990-12-27 2000-09-07 Matsuo Sangyo Co. Ltd., Osaka Vorrichtung zur Zuführung von Pulverfarben
FR2720664B1 (fr) * 1994-06-01 1996-08-30 Sames Sa Dispositif de projection de produit de revêtement pulvérulent.
JP3386326B2 (ja) * 1996-12-26 2003-03-17 株式会社日清製粉グループ本社 粉体塗装用粉体塗料供給機
US6586046B1 (en) 2000-01-26 2003-07-01 General Electric Company Fluidized bed apparatus and method for treatment of nonspherical, nonequiaxed particles
US6676049B2 (en) 2001-11-16 2004-01-13 Efc Systems, Inc. Bell cup powder spray applicator
US7303597B2 (en) * 2002-10-15 2007-12-04 Pratt & Whitney Rocketdyne, Inc. Method and apparatus for continuously feeding and pressurizing a solid material into a high pressure system
US7360639B2 (en) * 2004-06-16 2008-04-22 Pratt & Whitney Rocketdyne, Inc. Hot rotary screw pump
DE102005003620A1 (de) * 2005-01-26 2006-08-03 Lanxess Deutschland Gmbh Verfahren und Vorrichtung zur pneumatischen Förderung von schwerfließendem Schüttgut
DE202018101651U1 (de) * 2018-03-16 2018-04-09 Seepex Gmbh Anlage zur Förderung von pastösem Material
CN108893702A (zh) * 2018-07-24 2018-11-27 黄文芳 一种用于粉末离子等离子镀涂设备的喷涂箱装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1450903A (en) * 1921-01-27 1923-04-03 Allis Chalmers Mfg Co Fuel feeder
FR2373469A1 (fr) * 1976-12-10 1978-07-07 Colmant Cuvelier Dispositif de stockage et d'extraction pour produits pulverulents
US4488838A (en) * 1982-05-24 1984-12-18 Textron Inc. Process and apparatus for feeding particulate material into a pressure vessel
JPS60132632A (ja) * 1983-12-21 1985-07-15 Matsushita Electric Ind Co Ltd フイ−ダ−装置
US4826361A (en) * 1984-11-26 1989-05-02 Swiss Aluminium Ltd. Conveying device for transportation of flowable materials
US4691865A (en) * 1986-01-23 1987-09-08 Interlock Corporation Device for chilling stream of gas-suspended particles
US4759500A (en) * 1986-01-23 1988-07-26 Interlock Corporation Process for chilling stream of gas-suspended particles
DE3743864A1 (de) * 1987-12-23 1989-07-06 Praezisions Werkzeuge Ag Verfahren zur reduzierung von umgebungseinfluessen auf die pulverbeschichtung eines werkstueckes und pulverbeschichtungsanlage
JPH02172551A (ja) * 1988-12-23 1990-07-04 Babcock Hitachi Kk 溶射装置
US5209608A (en) * 1991-10-18 1993-05-11 Kevin Edwards Air grain conveyor system

Also Published As

Publication number Publication date
ES2112544T3 (es) 1998-04-01
CA2161963C (fr) 2001-07-10
CA2161963A1 (fr) 1994-12-08
BR9406276A (pt) 1996-02-13
US5836722A (en) 1998-11-17
EP0703832A1 (de) 1996-04-03
DE69408318D1 (de) 1998-03-05
FR2705591A1 (fr) 1994-12-02
FR2705591B1 (fr) 1995-08-11
WO1994027731A1 (fr) 1994-12-08
DE69408318T2 (de) 1998-08-27

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