US3620190A - Spraying apparatus - Google Patents

Spraying apparatus Download PDF

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Publication number
US3620190A
US3620190A US826832A US3620190DA US3620190A US 3620190 A US3620190 A US 3620190A US 826832 A US826832 A US 826832A US 3620190D A US3620190D A US 3620190DA US 3620190 A US3620190 A US 3620190A
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US
United States
Prior art keywords
conveyor belt
vessel
conveyor
powdery material
spraying
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
US826832A
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English (en)
Inventor
Otto Renner
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs 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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Application granted granted Critical
Publication of US3620190A publication Critical patent/US3620190A/en
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
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects

Definitions

  • the present invention relates to an apparatus for electrostatically spraying a material which is in powder form, which apparatus includes a conveyor that extends into the vessel.
  • One way of coating work pieces is by means of the so-called whirl-sintering process, in which powdery material located in a vessel that is open at the top is maintained in a suspended state by means of a weak current of air which is introduced into the vessel through an air-permeable bottom.
  • the work piece to be coated is preheated to a predetermined temperature and is then dipped into the thus-loosed coating material.
  • a coating of predetermined thickness is formed on the surface of the workpiece, due to the temperature of the latter.
  • the coating is firmly bonded to the surface of the work piece, this being done in a suitable kiln.
  • the thus-obtained coatings are normally sufficiently well attached to the work piece.
  • the primary object of the present invention to provide a wayv of electrostatically spraying a workpiece which overcomes the above drawback, namely, to provide a way in which powdery material can beapplied uniformly by means of an electrostatic apparatus.
  • this is accomplished by providing conveyormeans which bring the powdery material to a point near the spraying zone and by providing means which move the material from this point into the spraying zone.
  • the electrostatic force between the workpiece to be coated and veyor the same being constituted by an endless belt 4 which passes over at least two, rollers and which is driven so as to move in the direction of the arrow 5.
  • a tapping mechanism 7 is located behind conveyor belt 4, i.e., at the side thereof which is directed away from the spraying zone, and is at the same level as the spray wires 6.
  • the workpieces 8 which are to be coated with the material 2 are located at a suitable distance away from the conveyor belt 4, these work pieces being carried by a conveyor 9 which serves both to ground the work pieces and to carry them through the spraying zone in the direction of the arrow 10.
  • the conveyor belt 4 which carries the material to be sprayed to a point near the spraying zone may be made of insulating material. In order to make certain that the conveyor belt will-be able to convey sufficient material into the spraying zone, the belt is roughened or is deformed so as to be other than absolutely flat. Alternatively, the conveyor belt may be made of a strandlike material which is intertwined, interwoven or netted into a conveyor belt. Yet another possibility is to provide a conveyor belt one of whose sides has a hidelike or brushlike surface.
  • the tapping mechanism 7 is suitably ar ranged so as periodically to tap the conveyor belt. This can be done, for example, by providing a tapping mechanism in the fonn of a vibrator.
  • means can be provided which cause a gaseous stream to blow the material from the conveyor belt 4 and into the spraying zone; this, it will be understood, presupposes that the conveyor belt be air-permeable.
  • the gaseous medium used to move the material from the conveyor belt to the workpieces to be coated will be an inert gas, thereby to prevent any possible danger or damage due to combustion.
  • the spraying part forming part of the electrostatic equipment is normally not sufficient to effect this movement in such a way as to produce uniform coating.
  • FIG. 1 is a schematic view of an electrostatic spraying apparatus according to the present invention.
  • FIG. 2 is a plan view of a multiple-unit electrostatic spraying apparatus according to the present invention.
  • FIG. 3 is a front view of the electrostatic spraying apparatus shown in FIG. 1.
  • FIG. 3a is a front view of a portion ofthe apparatus of FIG. 3 showing a preferred modification thereof.
  • FIG. 4 is a fragmentary view, on an enlarged scale, of a detail of the structure shown in FIG. 3.
  • FIG. 5 is a plan view of a multiple-unit electrostatic spraying apparatus according to the invention for simultaneously spraying a plurality of surfaces of a three-dimensional workpiece.
  • FIG. 1 shows an electrostatic spraying apparatus according to the present invention, the same incorporating an open vessel 1 containing a supply of the material 2 which is in powder form and which is to be applied by electrostatic spraying.
  • This material 2 is loosened, in a manner known per se, in whirl sintering by means of an airstream, indicated by the arrows 3, which is passed upwardly through the air-permeable bottom of the vessel 1.
  • the material is taken out of the vessel 1 by a conmaterial can be moved from the conveyor belt to the work pieces is by providing an ultrasonic wave source.
  • the tension of the conveyor belt 4 may suffice to move the material out of the belt and into the spraying zone.
  • the spray wires 6 may be used as abutments against which the tapping means strike.
  • a suitable powder-permeable abutment 11 which allows the powdery material 2 to pass through.
  • the apparatus may include a plurality of individual units each as described above, the same being represented schematically, in FIG. 2, by the respective conveyor belts 4a, 4b, 40.
  • the several units are arranged in a line extending generally in the same direction as that in which the workpieces 8 are conveyed.
  • adjacent conveyor belts are run in opposite directions.
  • the reaches of the two end conveyor belts 4a and 4c, for example, which face the spraying zone will, in the arrangement depicted in FIG. 2, run from top to bottom (as seen in FIG. 1) and the corresponding reach of the conveyor belt 4b-which is between the conveyor belts 4a and 4' wm run from bottom to top.
  • the individual units may be so arranged that the conveyor belts of all units surround the workpiece on all sides. Such an arrangement is shown, for example, in FIG. 5 for a workpiece of rectangular cross section whereby four spraying units are utilized.
  • FIG. 3 again shows the vessel 1 containing the material 2.
  • Air is introduced into the bottom of the vessel 1 by way of the air inlet conduit 3.
  • the conveyor belt 4' is here shown as being constituted by a loose web, the belt being run over rollers l2 and 13, the latter being mounted for rotation within vessel 1 and below the level of the material 2.
  • the other roller 12, which is mounted above the vessel, is driven by a motor 14.
  • the conveyor belt 4' is prevented from running off the rollers l2, 13, by means of a belt which has a V-shaped cross section and which itself runs in V-shaped grooves that are provided in the two rollers.
  • the conveyor belt 4' is suitably secured to the surface of the V-shaped belt 15, as, for example, by being glued thereto.
  • FIG. 4 is similar to the upper part of FIG. 3 but shows the roller 12 as being provided with a helical ridge 19, the purpose of which is to prevent the belt 4 from running off the roller. If desired, both rollers 12 and 13 may be provided with such helical ridges.
  • conveyor means including a conveyor belt and roller means for guiding said conveyor belt, said conveyor means extending down into said vessel for removing said powdery material from said vessel and moving same to a point adjacent an electrostatic spraying zone;
  • said means d comprise a tapping mechanism arranged on that side of said conveyor belt which is directed away from said spraying zone and an abutment which is on the opposite side of said conveyor belt and hence on that side which is directed toward said spraying zone, said abutment means being powder-permeable to allow the passage therethrough of said material.
  • abutment means comprise wires which are electrically connected to a source of high voltage and which themselves thus form part of a means for applying an electrostatic charge to said material to be sprayed.
  • Apparatus for electrostatically spraying powdery material comprising, in combination:
  • conveyor means extending into said vessel for moving the material from said vessel to a point near a spraying zone, said conveyor means including a conveyor belt and roller means for guiding said conveyor belt, said roller means include at least two rollers each having a V-shaped groove and said conveyor means further comprise a V- shaped belt connecting said rollers and running in said grooves thereof, at least one of said rollers having a helical ridge; and
  • conveyor means including an air-permeable conveyor belt and roller means for guiding said conveyor belt, said conveyor means extending down into said vessel for removing said powdery material from said vessel and moving same to a point adjacent an electrostatic spraying zone;
  • An arrangement for electrostatically spraying powdery material onto all sides of a workpiece comprising a plurality of apparatuses each as defined in claim 8, the said apparatuses being arranged such that the conveyor belts of all of said apparatuses surround the workpiece.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Spray Control Apparatus (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
US826832A 1968-05-22 1969-05-22 Spraying apparatus Expired - Lifetime US3620190A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19681752410 DE1752410A1 (de) 1968-05-22 1968-05-22 Einrichtung zur elektrostatischen Behandlung von Werkstuecken
DE19681808150 DE1808150A1 (de) 1968-05-22 1968-11-09 Elektrostatische Sprueheinrichtung
DE19681808149 DE1808149A1 (de) 1968-05-22 1968-11-09 Elektrostatische Sprueheinrichtung

Publications (1)

Publication Number Publication Date
US3620190A true US3620190A (en) 1971-11-16

Family

ID=27181143

Family Applications (1)

Application Number Title Priority Date Filing Date
US826832A Expired - Lifetime US3620190A (en) 1968-05-22 1969-05-22 Spraying apparatus

Country Status (7)

Country Link
US (1) US3620190A (de)
AT (1) AT304731B (de)
DE (3) DE1752410A1 (de)
ES (1) ES367506A1 (de)
FR (1) FR2009093A1 (de)
GB (1) GB1268391A (de)
SE (1) SE339919B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1295999C (zh) * 2002-01-10 2007-01-24 雀巢产品有限公司 用于提取物质的自动装置

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1599303A (en) 1977-09-20 1981-09-30 Nat Res Dev Electrostatic spraying
US4489894A (en) * 1981-02-27 1984-12-25 National Research Development Corporation Inductively charged spraying apparatus
DE3478202D1 (en) * 1983-01-06 1989-06-22 Nat Res Dev Electrostatic spray head
GB8305865D0 (en) * 1983-03-03 1983-04-07 British Res Agricult Eng Electrostatic sprayers
GB2462112B (en) * 2008-07-24 2012-11-07 Stfc Science & Technology An apparatus and method for producing fibres
WO2014032187A1 (en) * 2012-08-31 2014-03-06 Alectos Therapeutics Inc. Glycosidase inhibitors and uses thereof
DE102022113575B4 (de) 2022-05-30 2025-05-08 Holger Volz Beschichtungsvorrichtung und Verfahren zum Beschichten eines flächigen Werkstückes mit der Beschichtungsvorrichtung
CN115318481B (zh) * 2022-10-12 2023-02-03 常州铭赛机器人科技股份有限公司 一种高精度压电喷雾阀的控制方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1581322A (en) * 1925-04-08 1926-04-20 American Multitone Papers Corp Method of and apparatus for applying color
US2174328A (en) * 1935-02-06 1939-09-26 Behr Manning Corp Piled surface in pattern form
US2254016A (en) * 1933-01-20 1941-08-26 Carborundum Co Coating apparatus
US3439649A (en) * 1965-03-15 1969-04-22 Ransburg Electro Coating Corp Electrostatic coating apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1581322A (en) * 1925-04-08 1926-04-20 American Multitone Papers Corp Method of and apparatus for applying color
US2254016A (en) * 1933-01-20 1941-08-26 Carborundum Co Coating apparatus
US2174328A (en) * 1935-02-06 1939-09-26 Behr Manning Corp Piled surface in pattern form
US3439649A (en) * 1965-03-15 1969-04-22 Ransburg Electro Coating Corp Electrostatic coating apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1295999C (zh) * 2002-01-10 2007-01-24 雀巢产品有限公司 用于提取物质的自动装置

Also Published As

Publication number Publication date
GB1268391A (en) 1972-03-29
DE1752410A1 (de) 1970-12-03
ES367506A1 (es) 1971-04-16
AT304731B (de) 1973-01-25
DE1808150A1 (de) 1970-09-17
SE339919B (de) 1971-10-25
FR2009093A1 (de) 1970-01-30
DE1808149A1 (de) 1970-09-17

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