US3716024A - A device for spraying an electrified powdered material onto a structure - Google Patents

A device for spraying an electrified powdered material onto a structure Download PDF

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Publication number
US3716024A
US3716024A US00084260A US3716024DA US3716024A US 3716024 A US3716024 A US 3716024A US 00084260 A US00084260 A US 00084260A US 3716024D A US3716024D A US 3716024DA US 3716024 A US3716024 A US 3716024A
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Prior art keywords
cabin
powdered material
tank
spray
mixture
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Expired - Lifetime
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US00084260A
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English (en)
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G Pierson
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Carrier SCS
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Carrier SCS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
    • B05B14/48—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths specially adapted for particulate material
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • ABSTRACT Device for spraying an electrified powdered treating or coating material onto a structure.
  • the device comprises a cabin through which the structure is conveyed.
  • a mixture of the powdered material and air is sprayed onto the structure by spraying means connected to metering and mixing means placed in the bottom of a bank containing the powdered material. Means are provided for recovering the powdered material which has not been deposited on the structure and returning this material to the tank.
  • PATENTEDFEB 13 I975 SHEET 2 OF 4 'Irll IIIVIII 111 ruvnrron P. PIEQSON GERALD PATENTEUFEB13
  • liquid products having a variable fraction of solvent, the nature and the quantity of which depend on the natural or forced drying processes employed.
  • the surfaces of parts are usually treated or coated by means of a brush or a roller, or by spraying or dipping.
  • An object of the present invention is to remedy the above-mentioned drawbacks by providing a new device for coating or treating the surfaces of structures or parts whereby it is possible to reduce to a minimum the quantity of treating product utilized, and preclude risks of evaporationor emanation of this product even when the parts under treatment must be transferred from the spraying device to a cooling, drying or baking enclosure.
  • the invention provides a device for spraying electrified powdered material for coating or treating the surface of parts or structures comprising a cabin having an interior kept at a pressure lower than the surrounding pressure, some sides of the cabin having lock-chambers for the passage of a conveyor for moving the parts or products, wherein'the parts are made to pass in front of at least one spray distributor for spraying an airpowder mixture, the particles of said mixture being subjected to an electrostatic charge different from the charge of the parts, the effective part of the distributor being provided with an element dividing up the airpowder mixture flowing therein, the distributor being in communication with an adjustable metering and mixting means which is supplied with compressed air and disposed in a supply tank containing the powdered material and connected to the lower part of said cabin by devices for the recovery of excess powdered material projected.
  • FIG. l is a diagrammatic sectional perspective view, partly in section, of the device of the invention
  • HQ 2 is a partial, perspective, enlarged view, partly in section of one of the elements of the device
  • FIG. 3 is a section on a reduced scale of a modification of the device of FIG. 1
  • FIG. 4 is a sectional view of a modification of the element of FIG. 2;
  • FIG. 5 is a side elevational view of another modification of the element of FIG. 2
  • FIG. 6 is a perspective view, partly cut-away, illustrating another embodiment of one of the components of the device.
  • the device comprises a cabin 1 having two opposite openings 2 made in the same way as air lockchambers.
  • the openings 2 allow a path of movement 3 to extend through the cabin, the path comprising a conveyor extending from a loading station, through the cabin l and leading to a natural or forced drying enclosure.
  • the cabin 1 is provided at its base with a container 4 containing a supply 5 of powdered product of small grain size, the maximum or optimum level of the product being diagrammatically shown in dash-dot line.
  • the container 4 includes a flat bottom 6 joined to two panels 7 upwardly diverging from the bottom 6 to corresponding lateral sides of the cabin to constitute product recovering or collecting means.
  • the container 4 supports, by means of fixed cross-bars 8, a metering and mixing means 9 made of a tubular element 10, similar to the tapered part of a venturi, the small section end 11 thereof being spaced from the bottom 6.
  • the large section portion 12 of the tubular element 10 is combined with a pivotable shutter 13 whereby the section of the tubular element 10 can be regulated.
  • the shutter 13 is connected to a control rod 14 provided with a control handle 15.
  • the substantially middle portion of tube 10 communicates with a pressurized air injecting pipe 16.
  • the tubular element 10 communicates with a tube 17 diametrically opposed to the pipe 16 and leading to a spray distributor 18 which extends vertically inside the cabin 1.
  • the spray distributor 18 can be rectilinear, bent or have some other shape.
  • the distributor 18 is maintained parallel with the wall alongside which it extends by spacer member 19.
  • the wall of the distributor 18 has throughout the effective length thereof an axially extending slot 20 through which extends a strip 21 preferably of insulating material and extending transversely across substantially the whole of the inside section of the distributor 18.
  • This strip 21 has notches 22 and 23 on the two wide faces of the strip, said notches having a constant spacing, but being disposed in alternating staggered relation on the two faces of the strip.
  • the notches 22 and 23 can have a uniform shape throughout the width of the strip 21 or can taper from the edge 24 of the strip facing the inside of the cabin l to nothing on the corresponding wide faces of the strip.
  • the strip 21 is preferably interchangeable to allow a modification of the spraying characteristics of the distributor 18 in accordance with the nature of powdered product 5 and the work to be performed.
  • the strip 21 extends between two fixed or adjustable supports 25, mounted on the distributor 18 to hold a metallic wire 26 taut in front of the edge 24 of the strip 21.
  • the wire 26 is connected to two conductors 27 and 38 leading from a
  • the above-described device operates in the following way After filling the container 4 with a powdered product, the compressed air supplied by the pipe 16 passes through the metering and mixing means 9 before reaching the tube 17.
  • the latter constitutes a chamber for both metering and homogeneizing the mixture of air and powdered product caused to flow through the distributor 18, the volume of which ensures the expansion of the mixture.
  • the air-powered product mixture flows through the notches 22 and 23 and is divided into as many spray jets thereby ensuring a continuous and distributed or spread spraying of the mixture.
  • Said mixture necessarily passes through the ionizing field created by the stretched metallic currentcarrying wire 26.
  • the particles of powdered product which are subjected to an electrostatic charge are sprayed or projected onto the parts which are conveyed through the cabin 1.
  • the distributor 18 When the distributor 18 is relatively high, the mixture must be brought to sufficient pressure to ensure that the upper part of the distributor 18 is suitably fed with the airpowdered product mixture.
  • the upper end of the distributor 18 is provided with a relief flap 18, which returns the excess mixture to the cabin.
  • the cabin 1 is connected by a pipe 30 to a source of suction which ensures that the pressure inside the cabin is lower than the surrounding pressure. The result is that the excess product is drawn out of the cabin and recovered through a cyclone (not shown) and recycled to the container 4.
  • the pipe 30 is provided in the upper part of cabin 1 so as to limit the amount of the excess product drawn out, the major part thereof falling to the lower part of the cabin 1, where it is collected by the recovering means 7 and directed toward the supply tank.
  • the parts or structures which are made to travel through the cabin l have, of course, an electrostatic charge which is different from the charge of the sprayed particles of the powdered product so that the parts are automatically covered with an adhering coat. Said coat is then submitted, out of the spraying zone or possibly outside the cabin 1, to a fixing treatment so as to obtain an homogeneous, dense and resistant coating.
  • FIG. 3 shows that the spraying device may have more than one spray distributor when opposed surfaces of parts have to be coated or treated.
  • the container 4 supports two metering and mixing means 9a,9b, placed in a staggered manner.
  • the means 9a,9b communicate with individual pipes 16a,16b supplying compressed air and also communicate with two tubes 17a,17b leading to two spray distributors 18a,18b.
  • the wires 26a,26b of said distributors can be supplied with current by two different generators or by a generator 31 having two outputs.
  • the shutters 13a,13b are connected to control rods l4a,l4b preferably accessible simultaneously from one of the sides of cabin l.
  • the two spray distributors 18a,l8b can have a similar or different shape, depending on the characteristics of the exposed surfaces of the parts to be treated.
  • FIG. 4 shows a modification in which the spray'distributor 18 is composed of a tubular element 32 made of an insulating material and defining an axial slot 33.
  • the tubular element 32 contains a dividing component 34 shaped like a comb having teeth 35 which have different lengths but ends aligned in a plane parallel to the plane of the opposed longitudinal edge of the component 34.
  • the latter is placed in the slot 33 in such manner that the shorter teeth are located adjacent the base of tubular element 32.
  • the purpose of this arrangement is to ensure that the jets of the mixture passing through the slot 33 have a substantially uniform concentration all along the distributor 18.
  • the spaced 36 between the teeth ensure a deviation of the product into the slot 33 which progressively increases with increase in the length of the teeth 35 and this compensates for the reduction in the concentration of the air-powder mixture as it rises in the distributor 18. This allows the same quantity of powder to be sprayed throughout the height of the spray sheet formed by the aligned jets.
  • the wire 16 has to be connected to the high frequency electric power generator 29.
  • the component 34 can be made of an electrically conductive material and connected to the generator 29 by conductors 37 and 38.
  • the component 34 may have a width which is different from the section of the distributor 18 so as to dispose the ends of the teeth 35 on either side of the slot 33.
  • FIG. 5 A further modification is represented in FIG. 5 according to which the dividing component is composed of a strip or a filament 39 having corrugations 40 whose magnitudes increase from the end 41 located in the lower part of the distributor 18.
  • the corrugations 40 are so designed as to have a configuration whose transverse extent is equivalent to that of the spaces 36 between teeth 35 so that they perform the same function when the filament of the strip 39 is disposed in the distributor 18 in such manner that the aligned crests of the corrugations 40 are at least partly engaged within the axial slot 33.
  • the strip or filament 39 can be made of insulating material when the electrostatic field is produced by the wire 26 or of an electrically conductive material in which case it is directly connected to conductors 37 and 38.
  • FIG. 6 shows another embodiment of the means for supplying and subsequently recovering the powdered product.
  • cabin l includes a plane bottom 42 under which is hung, through elastic sealing elements 43 such as flat gaskets, a
  • hopper 44 constituting the recovering or recycling means for the excess powdered product.
  • the bottom of hopper 44 is extended by a nozzle or other tubular element 45 the interior of which is provided with a removable filtering cartridge 46.
  • the above-described recovering means is connected to a vibrator 47 of any suitable type.
  • the nozzle is connected through a flexible sleeve 48 to a tubular shaft 49 projecting from above a container or tank 50.
  • a horizontal metering and mixing means 51 extends through the tank 50 and is connected, on one hand, to the tube 17 and, on the other hand, to the air-injection pipe 16.
  • the means 51 can be directly constituted by the end portion of the tube 17 into which the pipe 16 partly extends.
  • the means 51 is constituted by a sleeve slidably mounted on the tube 17 so that by the adjustment of the axial position of the sleeve through a manual control, it is possible to vary the proportion of the drawn-in powdered product without modifying the volume of the carrier fluid supplied by the pipe 16.
  • the metering and mixing means 51 is placed above a porous element 52 dividing the tank. into a lower chamber 53 and an upper chamber 54.
  • the chamber 53 communicates with a pipe 55 supplying air at low pressure, whilst the chamber 54 contains the powdered product, it being filled with the product through an inspection hole 56.
  • the chamber 54 also includes a float 57, operating a switch 58 controlling the electric current 59 supplied to the vibrator.
  • the device of FIG. 6 operates in the following manner:
  • the lower chamber 53 of the tank 50 is supplied with air after having previously filled the chamber 54 with a suitable quantity of powdered product.
  • the air delivered by pipe 55 passes through the porous element 52 and ensures that the powdered product is put in suspension in the air.
  • the float 57 is consequently kept in its upper position and the switch 58 cuts off the supply to the vibrator 47.
  • the pipe 16 is supplied with the air as described above so as to supply the air-powdered product mixture to the spray distributors, the metering'and mixing means 51 being adjusted if required.
  • the excess powdered product falls by gravity onto the bottom 42 and the hopper 44 while being kept at the level of this recovering or recycling element by the presence of i the filtering cartridge 46.
  • the float 57 is urged downwardly and closes the switch 58 which allows power to be supplied to the vibrator 47.
  • the vibrations of the vibrator 47 are transmitted to the recovering means which causes the excess powdered product to fall into the tank 50 and thus reestablishes the optimum level of the product in the tank.
  • a pressure relief flap l8 is provided for the purpose of preventing the presence of excessively strong jets in the lower part of the distributor 18.
  • Another solution consists in the provision of a baffle-plate in an adjustable position in front of the slot 20 to ensure the deviation of a variable fraction of each jet as it issues from the distributor.
  • the distributor can also be advantageously inclined so as to prevent droppings from the upper jets causing an increased concentration of product in the lower jets.
  • a device for spraying an electrified powdered coating or treating material onto the surface of a structure comprising a cabin having opposed walls, means for conveying and supporting said structure in a path in the cabin, means defining apertures in said opposed walls for the passage of said conveying and supporting means and said structure, means for maintaining the interior of the cabin at a pressure lower than a pressure prevailing outside the cabin, spray distributing means located in the cabin for spraying onto said structure supported in said path a mixture of air and said powdered material, means for creating a difference of electrostatic charge between said powdered material of said mixture and said structure, the spray distributing means comprising at least one hollow element, spray outlet means in form of a longitudinally extending slot in the hollow element, means for'dividing said mixture issuing from said outlet means into a plurality of spray jets, said dividing means comprising an element which extends from within the hollow element into said slot and defining, with said outlet means, orifices producing jets of said mixture, a powdered material tank adjacent a lower part of the
  • a device as claimed in claim 1, wherein said means for putting said cavity in communication with the hollow element comprises a tube for homogenizing said mixture.
  • the spray outlet means comprise means defining an elongate opening in the hollow element and the dividing means comprise a strip located in said opening and having two opposed faces and notches in said opposed faces, the notches in each of said opposed faces being spaced equal distances apart from each other and the notches of one of said opposed faces being in staggered relation to the notches of the other of said opposed faces, said notches defining with said opening outlets producing said spray jets.
  • the spray outlet means comprise means defining an upwardly extending elongate opening in the hollow element and the dividing means comprise an upwardly extending strip located in said opening and having a plurality of transversely extending teeth which define a plurality of gaps which progressively increase in length from one gap to another in the direction upwardly of the strip, said teeth having outer ends substantially parallel with said elongate opening.
  • the spray outlet means comprise means defining an upwardly extending elongate opening in the hollow element and the dividing means comprise an elongate member having transversely extending loop portions defining transverse corrugations which progressevely increase in transverse extent from one corrugation to another in the direction upwardly of the member, said corrugations having outer end portions substantially parallel with said elongate openings.
  • a device as claimed in claim 1, wherein the means for creating a difference of electrostatic charge comprise a wire extending in front of the spray outlet means and a high-frequency current generator connected to said wire.
  • the means for creating a difference of electrostatic charge comprise said means for dividing said mixture which is in the form of an electrically conductive element extending in the spray outlet means and a high-frequency current generator connected to the conductive element.
  • the metering and mixing means comprise a tube having a small lower inlet portion adjacent and in spaced relation to a bottom wall of the tank and a large upper outlet end portion, an adjustable shutter associated with the tube for variably closing the outlet end portion, the tube defining said cavity and said cavity communicating with the hollow element in a region intermediate said end portions of the tube.
  • the recovering means comprise a hopper located at the base of the cabin, resiliently yieldable means connecting the hopper to a lower part of the cabin and allowing vibration of the hopper relative to the cabin, and vibrating means associated with the hopper for vibratin the ho er, said assa ewa bein flexible.
  • a d ice as cl imef in clii- 1m 1 further comprising a porous wall dividing the tank into an upper chamber for containing said powdered material and a lower chamber, a pipe for connection to a low-pressure air supply connected to the lower chamber for fluidifying the powdered material in the upper chamber via said porous wall, float means in the upper chamber responsive to the level of the powdered material in the upper chamber and associated with the vibrating means to control operation of the vibrating means in accordance with the level of the powdered material in the upper chamber.
US00084260A 1969-11-04 1970-10-27 A device for spraying an electrified powdered material onto a structure Expired - Lifetime US3716024A (en)

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Application Number Priority Date Filing Date Title
FR6937914A FR2012801A1 (de) 1969-11-04 1969-11-04

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US (1) US3716024A (de)
BE (1) BE758045A (de)
CA (1) CA945758A (de)
DE (1) DE2054242C3 (de)
ES (1) ES385606A1 (de)
FR (1) FR2012801A1 (de)
GB (1) GB1316286A (de)
SE (1) SE372430B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916826A (en) * 1973-09-18 1975-11-04 Electrostatic Equip Corp Electrostatic coating apparatus
US4031270A (en) * 1975-06-02 1977-06-21 Laidlaw Corporation Method of flocking metal articles
WO1998015739A1 (en) 1996-10-04 1998-04-16 Future Sea Farms Inc. Low head pumping system for fish farms

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2551659A1 (de) * 1975-11-18 1977-10-13 Malkmus Doernemann Carola Anlage zur elektrostatischen pulverbeschichtung von haengend bewegten teilen
DE4447818C2 (de) * 1994-12-22 2003-11-06 Eisenmann Kg Maschbau Verfahren zur Pulverbeschichtung und Lackieranlage zur Durchführung des Verfahrens
GB2329137B (en) * 1997-09-13 2001-08-08 Universal Finishing Systems Co Vacuum coating apparatus
IT202000005359A1 (it) 2020-03-12 2021-09-12 Massimo Verme Bulbo retrattile a geometria variabile per imbarcazioni semi plananti o plananti

Citations (10)

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Publication number Priority date Publication date Assignee Title
US2698814A (en) * 1952-05-01 1955-01-04 Ransburg Electro Coating Corp Electrostatic coating apparatus and method
US2706964A (en) * 1950-04-14 1955-04-26 Ransburg Electro Coating Corp Apparatus for electrostatic atomization
US2794417A (en) * 1944-09-29 1957-06-04 Ransburg Electro Coating Corp Apparatus for electrostatically coating articles
US3001719A (en) * 1959-07-30 1961-09-26 Gen Motors Corp Electrostatic coating apparatus with rotary impeller
US3027870A (en) * 1957-07-05 1962-04-03 Personal Products Corp Spray apparatus
US3205853A (en) * 1962-01-12 1965-09-14 Gen Motors Corp Electrostatic painting apparatus
US3396699A (en) * 1966-10-21 1968-08-13 Anaconda Wire & Cable Co Continuous coating apparatus
US3434758A (en) * 1966-05-04 1969-03-25 Ferro Corp Applicator for particulate material
US3486921A (en) * 1965-11-12 1969-12-30 Neil R Wallis Method for applying powder coatings to articles
US3539381A (en) * 1969-02-19 1970-11-10 Jacques K Kayarian Method and apparatus for flow coating

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2794417A (en) * 1944-09-29 1957-06-04 Ransburg Electro Coating Corp Apparatus for electrostatically coating articles
US2706964A (en) * 1950-04-14 1955-04-26 Ransburg Electro Coating Corp Apparatus for electrostatic atomization
US2698814A (en) * 1952-05-01 1955-01-04 Ransburg Electro Coating Corp Electrostatic coating apparatus and method
US3027870A (en) * 1957-07-05 1962-04-03 Personal Products Corp Spray apparatus
US3001719A (en) * 1959-07-30 1961-09-26 Gen Motors Corp Electrostatic coating apparatus with rotary impeller
US3205853A (en) * 1962-01-12 1965-09-14 Gen Motors Corp Electrostatic painting apparatus
US3486921A (en) * 1965-11-12 1969-12-30 Neil R Wallis Method for applying powder coatings to articles
US3434758A (en) * 1966-05-04 1969-03-25 Ferro Corp Applicator for particulate material
US3396699A (en) * 1966-10-21 1968-08-13 Anaconda Wire & Cable Co Continuous coating apparatus
US3539381A (en) * 1969-02-19 1970-11-10 Jacques K Kayarian Method and apparatus for flow coating

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916826A (en) * 1973-09-18 1975-11-04 Electrostatic Equip Corp Electrostatic coating apparatus
US4101687A (en) * 1973-09-18 1978-07-18 Electrostatic Equipment Corporation Electrostatic coating method
US4031270A (en) * 1975-06-02 1977-06-21 Laidlaw Corporation Method of flocking metal articles
WO1998015739A1 (en) 1996-10-04 1998-04-16 Future Sea Farms Inc. Low head pumping system for fish farms

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Publication number Publication date
DE2054242A1 (de) 1971-05-19
DE2054242B2 (de) 1980-10-23
BE758045A (fr) 1971-04-01
FR2012801A1 (de) 1970-03-27
DE2054242C3 (de) 1981-08-27
ES385606A1 (es) 1973-03-16
CA945758A (en) 1974-04-23
SE372430B (de) 1974-12-23
GB1316286A (en) 1973-05-09

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