WO2009027805A1 - Dispositif d'enduction par pulvérisation de poudre et son dispositif d'alimentation en poudre d'enduction - Google Patents

Dispositif d'enduction par pulvérisation de poudre et son dispositif d'alimentation en poudre d'enduction Download PDF

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Publication number
WO2009027805A1
WO2009027805A1 PCT/IB2008/002237 IB2008002237W WO2009027805A1 WO 2009027805 A1 WO2009027805 A1 WO 2009027805A1 IB 2008002237 W IB2008002237 W IB 2008002237W WO 2009027805 A1 WO2009027805 A1 WO 2009027805A1
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WO
WIPO (PCT)
Prior art keywords
powder
compressed air
supplemental compressed
supplemental
air intake
Prior art date
Application number
PCT/IB2008/002237
Other languages
English (en)
Inventor
Felix Mauchle
Hanspeter Michael
Hanspeter Vieli
Original Assignee
Itw Gema 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 Itw Gema Gmbh filed Critical Itw Gema Gmbh
Publication of WO2009027805A1 publication Critical patent/WO2009027805A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
    • B65G53/28—Systems utilising a combination of gas pressure and suction
    • 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

  • the present invention relates to a coating device - hereafter powder spraycoating equipment - comprising a pump assembly having two powder thrust pumps each fitted with a powder chamber containing a powder intake having a powder intake valve and a powder outlet having a powder outlet valve, at least one gas path being subtended in each powder thrust pump by means of which each powder chamber is connected alternatingly to a vacuum conduit to aspirate coating powder through the open powder intake valve into the powder chamber while the powder outlet valve is closed, or to a compressed air conduit to pneumatically expel a powder dose present in the powder chamber through the open powder outlet valve while the powder intake valve is closed, where one powder thrust pump is alternatingly switched to suction and the other powder thrust pump is switched to expulsion and thereafter one powder thrust pump is switched to expulsion and the other powder thrust pump to suction; a powder discharge conduit of which one end is always connected or connectable to the powder outlet paths of the powder outlet valves and another end to a spraycoating tool.
  • the present invention relates to a coating powder feeding device - hereafter spraycoating feed apparatus - feeding coating powder in particular to a powder spraycoating tool as claimed in one of the claims of the present invention and comprising a pump assembly containing two powder thrust pumps each of which is fitted with a powder chamber comprising a powder intake having a powder intake valve and a powder outlet with a powder outlet valve, each powder thrust pump subtending a gas path through which its powder chamber is alternatingly connected/connectable through the open powder intake valve while the powder outlet valve is closed to a vacuum conduit aspirating coating powder into the powder chamber or to a compressed air conduit to pneumatically expel a powder dose present in the powder chamber through the powder outlet valve while the powder intake valve is closed, alternatingly one powder thrust pump being switched/switchable to suction and the other powder thrust pump to expulsion and, then reversely one powder thrust pump is switched to expulsion and the other powder thrust pump to suction.
  • Powder thrust pumps and pump assemblies containing two powder thrust pumps also are partly called "dense phase powder pumps
  • the Japanese patent document JP 09071325 A discloses a thrust powder pump and a pump assembly of two thrust powder pumps operated in alternation.
  • Each thrust powder pump contains a powder chamber the size of which is bounded by a filtering pipe and of which the powder intake and powder outlet is fitted with a one-way valve or a switchable valve.
  • the filtering pipe is permeable to air but not to coating powder and enclosed by an annular chamber connectable alternatingly to a source of partial vacuum or compressed air. In this manner coating powder can be alternatingly aspirated into the paper chamber or be expelled from it by compressed air.
  • US patent 4,659,011 discloses spray apparatus comprising a powder spray aperture at the end of a powder duct and an supplementary compressed air intake in the powder duct through which supplemental compressed air may be tangentially introduced into said powder duct to generate a cyclone effect driving the coating powder upstream of the powder spray aperture, radially outward and simultaneously toward the powder spray aperture.
  • US patent 2004/00042341 discloses a coating powder spray means comprising at least one compressed air outlet to concentrate coating powder in the powder duct into the radial duct center upstream of a powder spray aperture. DESCRIPTION OF THE INVENTION
  • the objective of the present invention is a more uniform powder flow downstream of the pump assembly.
  • the powder path runs over part of its length through a filtering pipe made of a porous material permeable to air but not to the coating powder's particles.
  • the filtering pipe constitutes a circumferential wall around the powder path and hence subtends a large surface transmitting small quantities of supplementary compressed air into the powder path to allow controlling the powder particles in the sense of making the powder concentration more uniform.
  • the invention allows reducing even precluding flow pulsations in the flow path. Due to the present invention, a slight flow of supplementary compressed air improves the fluidity of the coating powder downstream of the pump assembly. Moreover the invention improves coating quality because introducing more uniform powder feed from the pump assembly to the spray tool.
  • the filtering pipe is a rigid, sintered body, preferably being made of a sintered metal such as bronze or aluminum, or a sintered plastic or a sintered mixture of materials mixture.
  • the filtering pipe's micropores may be designed so that the supplementary compressed air bubbles out of the pipe wall into the pipe duct, or in that the compressed air flows in the form of thin jets of compressed air out of the pipe wall into said pipe duct.
  • Fig. 1 shows powder spraycoating equipment fitted with a coating powder feed apparatus, both of the present invention, several embodiment variants being shown,
  • Fig. 2 shows a supplementary compressed-air intake of the invention on a scale larger than that of Fig. 1
  • Fig. 3 is a further embodiment mode of a powder spraycoating equipment fitted with a coating powder feed apparatus, both of the present invention
  • Fig. 4 schematically shows another embodiment mode of a powder thrust pump applicable in powder spraycoating equipment or coating powder feed apparatus of the present invention.
  • the powder spraycoating equipment schematically shown in Fig. 1 comprises a pump assembly 2 of two powder thrust pumps 4 and 6 each fitted with a powder chamber 10 having a powder intake 12 with a powder intake valve 14 and a powder outlet valve 16 with a powder outlet valve 18.
  • Each powder thrust pump 4 and 6 contains at least one gas path 20 by means of which the powder chamber 10 may be altematingly connected to a vacuum conduit 26 aspirating coating powder into the powder chamber 10 through the open powder intake valve 14 while the powder outlet valve 18 is closed or to a compressed air conduit 28 pneumatically expelling a powder dose present in the powder chamber 10 through the open powder outlet valve 18 while the powder intake valve 14 is closed.
  • the powder thrust pumps 4 and 6 are altematingly switched/switchable to aspirate and expel powder, and altematingly one of the powder thrust pump can be switched to suction while the other essentially simultaneously has been switched to expulsion, and thereupon, in an ensuing stage, the former has been switched to expulsion and the latter essentially simultaneously to suction.
  • the gas path 20 is fitted with a suction aperture 30 and a compressed air aperture 32 in a circumferential housing wall 34, further with a microporous filtering pipe 36 which at least over part but preferably all the length of the powder chamber 10 constitutes the circumferential wall of the powder chamber 10 between the powder intake 12 and the powder outlet 16 and which separates the powder chamber 10 from an annular chamber 38.
  • the annular chamber 38 is subtended between the external circumference of the filtering pipe 36 and the inner periphery of the housing outside wall 34 and encloses the filtering pipe 36. Due to its small pore sizes, the filtering pipe 36 is permeable to air but not to the coating powder.
  • the suction aperture 30 preferably issues near the powder outlet 16 into the annular chamber 38 and the compressed air aperture 32 preferably issues near the powder outlet 12 into this annular chamber 38.
  • a valve system 40 having for instance two valves 42 and 44 may be used, said valves being driven by a control unit 46.
  • the venting air (or suction) of the powder intake and powder outlet valves 14 and 18 is schematically indicated by an arrow 45.
  • the powder intake and powder outlet valves 14 and 18 may be of any kind. Preferably however they are pinch valves.
  • the powder intake side 48 of the two powder intake valves 14 may be connected by separate powder feed conduits to one or two different powder bins or, as shown in Fig. 1 , they may be connected by a feed branch 50 of a Y- junction 51 to one powder feed conduit 52 to remove powder from a powder bin 54 (shown on a much reduced scale).
  • the powder outlets 58 of the two powder outlet valves 18 are connected by discharge branches 60 for instance of a Y-shaped conduit junction 61 to one end of a powder discharge hose 62, the other end being connected to a spray tool 46.
  • the spray tool 46 contains a spray element 66 to spray coating powder onto an object to be coated.
  • the design of the spray element is arbitrary, for instance it may be a powder spray nozzle or a rotary powder spray element.
  • the powder discharge conduit 62 may be a rigid pipe conduit, preferably however it shall be a flexible hose.
  • At least one supplementary compressed air intake element 71 , 72, 73, 74, 75, 76 and/or 77 issuing into the powder path is configured at a minimum of one site of this powder path between the powder outlets 58 of the two powder outlet valves 18 and the spray element 66.
  • the discharge conduit branch 60 of the two powder discharge valves 18 and upstream beginning of the powder discharge conduit 62 connected to said valves preferably constitute the Y conduit junction 61 , the stem of the Y being constituted by the upstream beginning segment of the powder discharge conduit 62 and the two legs of the Y each by one of the two discharge conduit branches 60.
  • Fig. 1 shows the two supplementary compressed air intake elements 71 respectively 72 each at one of the two powder outlets 58 of the two powder outlet valves 18; the supplementary compressed air intake elements 73 and 74 each at the downstream end of one of the two discharge conduit branches 60 at the conduit junction 61 ; the supplementary compressed air intake element
  • the supplemental compressed air intake elements 71 through 77 all may be identical or different.
  • Fig. 2 schematically shows an applicable embodiment mode of one of supplemental compressed air intake elements 71 through 77, merely the reference 75 being shown for an element, representing all, configured between the conduit junction 61 and the powder discharge conduit 62.
  • the supplemental compressed air intake element (and/or 71 , 72, 73, 74, 76 and/or 77) each contains a filtering pipe 80 enclosing by 360° the powder path over part of its length, allowing the coating powder to flow through the filtering pipe duct 82.
  • An annular compressed air chamber 84 encloses the filtering pipe 80 over its outer circumference.
  • the annular compressed air chamber 84 is enclosed at its radially inner circumference by the filtering pipe 80, and, at a spacing from the filtering pipe 80 at its radially outer circumference by a housing 86.
  • Compressed air may flow from a compressed air conduit 88 through a valve 90 through a compressed air intake aperture 92 constituted in the housing 86 into the annular compressed air chamber 84 and from there through the filtering pipe 80 into the filtering pipe duct 82.
  • the filtering pipe 80 is microporous and permeable to air but not to the coating powder.
  • the filtering pipe 80 is a sintered body, for instance a metal or a plastic, or a mixture of metal and plastic. It may also be made of another material and/or be constituted by a filter membrane.
  • the filter pores of the filtering pipe 80 preferably are designed in a manner that compressed air - schematically indicated in Fig. 2 by the arrows
  • micropores of the powder pipe 80 may slant both radially and axially relative to the powder path and/or they may issue tangentially to the powder path circumference from the powder pipe 80 into the powder duct 82 and correspondingly guide the compressed air. Because of the large surface of the filtering pipe 80 at its inside surface, a slight quantity of compressed air is enough to homogenize the axial powder distribution in the filter duct 82 and thereby in the powder path. As a result pulses in powder flow in the powder path may be averted or at least be reduced.
  • Homogenization of the powder density may be attained in the longitudinal direction and cover the cross-section of the powder path.
  • the quantity of powder compressed air per unit time may be minimized in this manner and thereby the rate of the moving coating powder will be affected very little or not at all.
  • the compressed air flow may be increased to control the flow of coating powder.
  • the compressed air may flow in the form of jets or small air bubbles from the filtering pipe 80 into the filtering pipe duct 82 depending on the kind of filter pores and air pressure.
  • all supplemental compressed air intake elements 71 through 77 can be connected by a common, driven valve 90 to the compressed air duct
  • each supplemental compressed air intake element 71 through 77 may be fitted with its own driven valve.
  • One of the supplemental compressed air intake elements 71 through 77 is sufficient for the purposes of the present invention.
  • the use of two or more allows further improving their effectiveness on the powder path.
  • the filtering pipe 80 of the supplemental compressed air intake element 71 through 77 should extend over at least 270° over the circumference of the powder path, preferably over the full 360° around said path.
  • the length of the powder pipe 80 runs at least over 5 mm of the length of the powder path.
  • the filtering pipe 80 of the supplemental compressed air intake element 71 through 77 shall be a rigid body. However it may also be used as a flexible body.
  • the supplemental compressed air is fed in pulsed manner to at least one of the supplemental compressed air intake elements 71 through 77 at a pulse frequency equal to or preferably larger than the frequency of the pump assembly 2 at which said assembly delivers powder doses from its powder thrust pumps 4 and 6.
  • a pulsed source of compressed air or a compressed air pulse generator 102 may be used as the single, or one, or one of several or of all said supplemental compressed air intake elements 71 ,
  • control unit 46 is designed in a manner that the pulse frequency of the minimum of one of the supplemental compressed air intake elements 71 , 72,
  • 73, 74, 75 76 and/or 77 is adjustable as a function of the pump assembly's powder discharge frequency in one of the following possible ways: manually adjustable and/or preferably automatically controlled or preferably adjustment by regulation.
  • the supplemental compressed air pulse frequency can be advantageously increased thereby as said powder discharge frequency rises, and be reduced as it decreases.
  • control unit 46 may be advantageously designed in a manner that the rate of compressed air to the supplemental compressed air intake element 71 , 72, 73, 74, 75, 76 and 77 can be controlled by said unit depending as a function of the required flow of compressed air and in at least one of the following ways: illustratively manually and/or preferably automatically or preferably by regulation.
  • the powder spraycoating equipment can be designed for said adjustment of the supplemental compressed air pulse frequency or for said adjustment of the flow of supplemental compressed air, or for both.
  • the control unit 46 may contain all control elements or two or more control devices may be used. If manual adjustment of the supplemental compressed air pulse frequency is desired, then one manual adjustment element may be used in each case; such an element is schematically shown in Fig. 1 by the reference 104.
  • the powder intake valves 14 and the powder outlet valves 18 are pinch valves because they accumulate less coating powder than other kinds of valves and because such powder accumulations as there are can be easily cleansed by air flow.
  • Pinch valves are valves controlled by compressed air or partial vacuum. In principle however other kinds of control valves also are applicable.
  • automated valves for instance ball or flap valves driven by the pressure differential between the valve intake side and the valve outlet side and hence being automatically controlled by the excess and deficiency of pressure prevailing in the powder chamber 10.
  • the powder intake valves 14 and the powder outlet valves 18 may be loaded by the valve system 40 with compressed air or be subjected to partial vacuum or vented by atmospheric air.
  • the valves also may be designed in a manner that altematingly they are subjected to a partial vacuum or be vented into the external atmosphere.
  • they are designed in a manner that they can be altematingly connected to a source of compressed air or to a source of suction air.
  • the exhaust flow in the form of a venting flow or a suction flow is indicated in Fig. 1 by an arrow 45.
  • Fig. 3 shows another embodiment mode of a spraycoating powder feed equipment of the invention fitted with a powder spraycoating apparatus of the invention.
  • Figs. 1 and 3 are denoted by the same references and operate the same way. The difference in this instance is that the embodiment of Fig. 3 lacks both a suction aperture 30, and a compressed air aperture 32, rather there is a single air aperture 30/32 which can be connected by means of a valve system 40-2 having for example two valves
  • valve system 40-2 is driven by a corresponding control unit 46 which again may be fitted with a manual adjustment element 104
  • Fig. 4 illustratively shows a powder thrust pump 304 - where the same components as used in Fig. 1 are referenced the same way in
  • Fig. 4 In the embodiment mode of Fig. 4, the powder chamber 10 is enclosed by a hermetic chamber wall 334 into which are constituted the compressed air aperture 30 near the powder intake 12 and the suction aperture 32 near the powder outlet 16 of the powder chamber 10.
  • the suction aperture 30 is fitted with a microporous filter 336 impermeable to air but not to coating powder.
  • said filter is a sintered body or a membrane.
  • a suction hookup aperture 330 is separated by the microporous filter 336 from the suction aperture 30 and can be connected by means of a driven valve 342 to a suction line 26.
  • the compressed air aperture 32 can be connected by means of a driven valve 343 to a compressed air conduit 28. In this manner the powder chamber 10 can be loaded altematingly with compressed air or partial vacuum.
  • the two valves 342 and 343 may be replaced by a single multi-way valve.

Abstract

L'invention concerne un équipement d'enduction par pulvérisation de poudre et son appareil d'alimentation en poudre d'enduction. Un ensemble de pompe (2) comprend deux pompes de poussée de poudre (4, 6), chacune adaptée à un compartiment à poudre (10), la poudre d'enduction étant alternativement aspirée dans un compartiment à poudre (10) alors que la poudre d'enduction est expulsée par de l'air comprimé à partir de l'autre compartiment à poudre (10). On trouve au moins un élément d'admission d'air comprimé supplémentaire (71, 72, 73, 74, 75, 76, 77) sur le trajet d'éjection de la poudre de l'ensemble de pompe (2), qui est adapté à un tuyau de filtrage renfermant le trajet d'éjection de la poudre et qui est constitué d'un matériau de filtrage microporeux perméable à de l'air comprimé mais pas à de la poudre d'enduction. Le tuyau de filtrage est enfermé par un compartiment d'air comprimé duquel peut circuler l'air comprimé au travers de la paroi du tuyau de filtre dans le trajet d'éjection de la poudre.
PCT/IB2008/002237 2007-08-31 2008-08-28 Dispositif d'enduction par pulvérisation de poudre et son dispositif d'alimentation en poudre d'enduction WO2009027805A1 (fr)

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DE102007041551.8 2007-08-31
DE102007041551A DE102007041551A1 (de) 2007-08-31 2007-08-31 Pulversprühbeschichtungsvorrichtung und Beschichtungspulver-Fördervorrichtung dafür

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Cited By (7)

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CN102951449A (zh) * 2012-11-09 2013-03-06 裕东（中山）机械工程有限公司 一种竖向粉末输送装置
CN103687673A (zh) * 2011-02-14 2014-03-26 吉马瑞士有限公司 用于输送涂料粉末的粉末泵
US9027506B2 (en) 2011-05-02 2015-05-12 Nordson Corporation Dense phase powder coating system for containers
CN104684825A (zh) * 2012-08-27 2015-06-03 双子贸易开放式股份公司 真空式气动运送高质量浓度的粒状材料的方法
US10159994B2 (en) 2013-03-26 2018-12-25 Gema Switzerland Gmbh Spray-coating gun for spray coating objects with coating powder
US10604360B2 (en) 2013-04-03 2020-03-31 Gema Switzerland Gmbh Dense phase powder pump and corresponding operating method
CN112691802A (zh) * 2020-12-09 2021-04-23 广东泽亨智能科技有限公司 一种供粉装置、粉料装置及喷涂系统

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ITVI20100043A1 (it) * 2010-02-23 2011-08-24 Pastori Giancarlo Gruppo per il dosaggio di prodotti granulari, particolarmente adatto agli impianti di taglio a getto d'acqua.
DE102010060114A1 (de) * 2010-10-22 2012-04-26 Thönnißen Möller Engineering GmbH Verfahren und Vorrichtung zur pneumatischen Förderung und/oder Dosierung eines Schüttguts
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
DE102014215338B4 (de) * 2014-08-04 2016-03-31 Gema Switzerland Gmbh Pulverabgabevorrichtung und Pulverbeschichtungsanlage zum Pulversprühbeschichten von Gegenständen
CN114671251B (zh) * 2022-05-30 2022-10-18 四川炬原玄武岩纤维科技有限公司 一种玄武岩纤维输送装置

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CN103687673A (zh) * 2011-02-14 2014-03-26 吉马瑞士有限公司 用于输送涂料粉末的粉末泵
CN103687673B (zh) * 2011-02-14 2016-01-27 吉马瑞士有限公司 用于输送涂料粉末的粉末泵
US9027506B2 (en) 2011-05-02 2015-05-12 Nordson Corporation Dense phase powder coating system for containers
CN104684825A (zh) * 2012-08-27 2015-06-03 双子贸易开放式股份公司 真空式气动运送高质量浓度的粒状材料的方法
EP2889239A4 (fr) * 2012-08-27 2016-04-27 Twin Technology Company Ooo Procédé de transport sous vide / pneumatique de matériaux meubles ayant une concentration massique importante
CN102951449A (zh) * 2012-11-09 2013-03-06 裕东（中山）机械工程有限公司 一种竖向粉末输送装置
US10159994B2 (en) 2013-03-26 2018-12-25 Gema Switzerland Gmbh Spray-coating gun for spray coating objects with coating powder
US10604360B2 (en) 2013-04-03 2020-03-31 Gema Switzerland Gmbh Dense phase powder pump and corresponding operating method
CN112691802A (zh) * 2020-12-09 2021-04-23 广东泽亨智能科技有限公司 一种供粉装置、粉料装置及喷涂系统

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Publication number Publication date
DE102007041551A1 (de) 2009-03-05
DE202007018809U1 (de) 2009-05-14

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