EP0268126B2 - Verfahren zur Erhöhung der ausgegebenen Pulvermenge an einer Pulverbeschichtungsanlage sowie Pulverbeschichtungsanlage - Google Patents

Verfahren zur Erhöhung der ausgegebenen Pulvermenge an einer Pulverbeschichtungsanlage sowie Pulverbeschichtungsanlage Download PDF

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Publication number
EP0268126B2
EP0268126B2 EP87116035A EP87116035A EP0268126B2 EP 0268126 B2 EP0268126 B2 EP 0268126B2 EP 87116035 A EP87116035 A EP 87116035A EP 87116035 A EP87116035 A EP 87116035A EP 0268126 B2 EP0268126 B2 EP 0268126B2
Authority
EP
European Patent Office
Prior art keywords
powder
pressure
nozzle
gas
mixing chamber
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
EP87116035A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0268126A1 (de
EP0268126B1 (de
Inventor
Hardy P. Dr. Weiss
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.)
Prazisions-Werkzeuge AG
Praezisions Werkzeuge AG
Original Assignee
Prazisions-Werkzeuge AG
Praezisions Werkzeuge 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6314072&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0268126(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Prazisions-Werkzeuge AG, Praezisions Werkzeuge AG filed Critical Prazisions-Werkzeuge AG
Priority to AT87116035T priority Critical patent/ATE71859T1/de
Publication of EP0268126A1 publication Critical patent/EP0268126A1/de
Application granted granted Critical
Publication of EP0268126B1 publication Critical patent/EP0268126B1/de
Publication of EP0268126B2 publication Critical patent/EP0268126B2/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
    • 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
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1683—Arrangements for supplying liquids or other fluent material specially adapted for particulate materials
    • 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
    • B05B5/12—Plant for applying liquids or other fluent materials to objects specially adapted for coating the interior of hollow bodies

Definitions

  • the present invention relates to a method for controlling the amount of powder delivered per unit of time to a powder coating system, and to a powder coating system.
  • a plastic is in a dissolved form.
  • the solution is applied to the surface to be coated and the solvent is then evaporated.
  • the finest plastic powder usually electrostatically supported, is applied to a surface and then melted by the action of heat. This creates a plastic layer that adheres to the surface.
  • the present invention is basically concerned with the second mentioned technique, e.g. as is known from US-A-4 205 621 or EP-A-0 093 083.
  • the Puiver driven by gravity, cannot be pumped over long distances.
  • a conveying medium usually a conveying gas, is necessary in particular in order to be able to convey it on horizontal or at least not only vertical routes.
  • the present invention now relates to the coating technology mentioned, in which relatively long conveying paths between a powder container and a coating arrangement have to be overcome.
  • FIG. 1 Such a known coating system is shown schematically in FIG. 1.
  • coating powder is filled into a storage container 1.
  • a feed line 3 connects the container 1 to a mixing chamber 5.
  • a gas jet G generated by a pressure source 9, such as a compressor, is accelerated and blown into the mixing chamber 5.
  • P 1 denotes the pressure in the container 1, p 7 the pressure in the feed line for the conveying gas G and p 5 the pressure in the mixing chamber 5. Due to the jet acceleration at the nozzle 7, a pressure drop ⁇ p 75 is generated in the mixing chamber 5 for the time being a negative pressure with regard to the static pressure in the gas supply line 7. The accelerated gas in chamber 5 creates a static pressure drop .DELTA.p 15 from container 1 to chamber 5. This produces powder the container 1 is conveyed into the mixing chamber 5 and mixed with the gas jet G in the mixing chamber 5.
  • the powder-gas mixture is now conveyed out of the mixing chamber 5 through a delivery line 11, the powder-gas flow being delayed in a section 13 between the mixing chamber 5 and delivery line 11, as a result of which the kinetic energy in the mixing chamber 5 is converted into pressure energy and static pressure recovery takes place.
  • the powder-gas flow is now fed to a coating arrangement which is often relatively far away from the container 1, as in the case of the coating arrangement shown schematically in the lower part of FIG. 1.
  • This is a coating arrangement for the internal coating of pipes or pipe-section-like structures, as is used for the internal coating, for example of can bodies.
  • can bodies 15 are first fed via a cantilever arm to a connecting station 19, such as a welding station, then continue via the arm 17 to a coating arrangement 21.
  • a connecting station 19 such as a welding station
  • the delivery line 11 for the coating powder, the arm 17 is axially passed through the entire length of the arm and only opens out of the arm 17 in the coating area.
  • electrostatically assisted (not shown), the powder is applied to the inner surface of the can body 15 and usually excess powder is sucked back again.
  • the static pressure in the input container builds up as a function of the outlet pressure for supplying the injector nozzle with conveying gas provided pressure source.
  • the powder is transported along the line leading downstream of the injector nozzle essentially due to the impulse transmission of the conveying gas to the powder supplied from the input container.
  • a conveyor system for particulate material such as dust is known.
  • the material addition to a container is periodically closed, the container being pressurized so that the material remaining in the container is simultaneously fluidized and driven against the container outlet.
  • the material is conveyed further by means of a gas jet by using a switchable double nozzle for the gas jet and by utilizing pressure recovery.
  • only one nozzle is operated.
  • the higher delivery pressure p 7 has only a minor effect on the delivery rate as soon as the pressure ratio at the nozzle p 7 , p 5 is greater than the critical pressure ratio, for air about 1.7.
  • the increase in the delivery pressure p 7 is extremely expensive, since this pressure must be considerably higher than the pressure in the mixing chamber p 5 and the pressure P 1 in the container 1, the latter usually atmospheric pressure.
  • Another possibility for controlling the amount of powder dispensed would be to control the amount of gas injected into the mixing chamber 5 per unit of time. Given a delivery line configuration, this can lead to a build-up or pressure build-up in the mixing chamber 5 and a pressure drop ⁇ p 11 which is disproportionate to the amount of powder conveyed through line 11.
  • the injected gas jet G is now primarily used to accelerate and redirect the powder in the mixing chamber 5.
  • the delivery rate can now be set.
  • the amount of powder dispensed can be optimized by optimizing the jet expansion efficiency or delay efficiency. i.e. improve the recovery of the static pressure on the gas jet mentioned.
  • the delay section is thus, according to the invention, immediately after the nozzle mouth, which enables the desired improvement in pressure recovery.
  • an axially parallel outflow is achieved at an outlet cross section of the nozzle, such as nozzle 7 of FIG. 1.
  • the container according to claim 4 or claim 10 is preferably supplied with fluid air for fluidizing the powder in the area of the feed line, precautions must be taken which enable a filtered removal of the supplied air after the desired excess pressure has been reached.
  • FIG. 2a shows a powder container 30 on a system according to the invention, used instead of the container 1 from FIG. 1.
  • the container 30 is connected via a feed line 32 to an injector 8 according to FIG. 1, preferably an injector described below.
  • a porous fluid base 34 is arranged in the container 30, and a fluid-gas line 36 opens into the container 30 below the fluid base 34.
  • a fluid gas FL preferably air, is gently blown through the fluid base 34 into the overlying coating powder 40 through the line 36, as with the aid of a conventional type of blower, as shown schematically at 38.
  • a pressure generating element is generally provided on the container 30 in order to apply an overpressure p 30 to the powder 40 in relation to ambient pressure.
  • a pressure regulating device 42 such as a pressure regulating valve or a slide, is also provided on the container 30. Once the desired overpressure p 30 has been set in the container 30 and can be set on the pressure regulating device 42, the further fluid air FL escapes through the pressure regulating device 42, like the pressure regulating valve, via a filter 44.
  • the filter 44 is provided in order to filter out powder particles suspended in the escaping fluid air.
  • the container 30 is loaded with fresh powder via a line 46 and a schematically illustrated rotary valve 48, which ensures that when the container 30 is loaded with powder, there is no pressure equalization between the interior of the container and the surroundings.
  • a level control 50 with electrical output lines 52 monitors the powder level in the container 30 and controls or regulates, not shown, at most the amount of powder supplied via line 46 and rotary valve 48.
  • Fig. 2a the injector 8 is shown again according to Fig. 1, dashed a path coordinate x of the powder from the container via the feed line 32, through the injector 8, into the delivery line 11.
  • Fig. 2b the pressure curve along the path coordinate x is shown purely qualitatively, in an extended characteristic for an arrangement according to Fig. 1, in which there is atmospheric pressure in the container 1, dash-dotted lines according to the inventive embodiment of Fig. 2a, with overpressure p 30 in the container 30th
  • the internal pressure in the container 30 is now increased, which leads to the qualitative progression, as shown in broken lines.
  • the entire characteristic is increased by the excess pressure corresponding to the pressure p 30 , which has a strong effect on the amount of powder conveyed through line 11.
  • Raising the pressure in the mixing chamber 5, p 5 and the associated reduction in the pressure difference p 7 to p 5 according to FIG. 1 does not lead to a significant reduction in the delivery rate.
  • the delivery pressure p 7 and the amount of gas injected through the nozzle 7 can even be reduced, with the same or increased output quantity.
  • the overpressure p 30 ensures that the pressure losses along the delivery line 11 are overcome, while the kinetic energy of the injected gas stream, preferably an air jet, increases only the powder acceleration and its deflection. With the aid of the setting of the excess pressure p 30 with the pressure regulating device 42, the amount of powder conveyed is set through line 11.
  • FIG. 2b the position numbers of the parts according to FIG. 2a, which are run through as x progresses, are also entered.
  • the injector 54 comprises a mixing chamber 55 into which a nozzle 57 with an orifice 59 opens. Coaxial to the axis A 57 and the nozzle 57, the mixing chamber 55 has a section 61 which widens immediately after the mouth. The section 61 opens continuously into the delivery line 11, arranged coaxially to the axis A 57 of the nozzle 57.
  • the feed line 3 according to FIG. 1 or 32 according to FIG. 2a opens into the mixing chamber 55 transversely to the axis A 57 of the nozzle 57.
  • a gas jet G is injected through the nozzle 57 into the mixing chamber 55 and is delayed immediately after the nozzle orifice 59, in that the diverging mixing chamber section 61 starts immediately after the nozzle orifice 59.
  • the jet G is emitted as a free jet from the nozzle 57 and the boundary of the section 61 is designed to be 15 ° or less in accordance with the jet edge angle ⁇ of the free jet with respect to the axis A 57 .
  • the deflection and acceleration of the inflowing powder takes place between the nozzle mouth 59 and the approach of section 61, with the result that the gas jet is additionally decelerated and thus spreads out with a jet edge angle that is greater than approximately 8 °, the jet edge angle of the free jet which propagates undisturbed.
  • the nozzle 57 becomes operated with a subcritical pressure ratio p 57 to p 55 , whereby shock waves are avoided and free jet expansion is possible.
  • the inner bore of the nozzle 57 is continuously converging, as shown, the diameter ratio d 57 in the non-converging nozzle part to the mouth diameter d 59 preferably being greater than 5.
  • a flow channel 63 is provided between the connection of the feed line 3 or 32 and the section 61, which continuously leads into the area 61.
  • the continuously curved transition from line connection on line 3 or 32 to divergent section 61 prevents further erosion by accelerated powder particles, in particular at the mixing chamber locations designated E x in FIG. 3.
  • To generate the free jet opens out further the nozzle 57 with a sharp edge into the mixing chamber 55.
  • the nozzle 57 is as shown by the double arrow S. for example, via a fine thread 64 between nozzle 57 and mixing chamber block 65, axially adjustable.
  • the flow channel 63 between the mouth of the feed line 3 or 32 and the mouth into the delivery line 11 is designed in the form of a continuously bent Laval nozzle.
  • the nozzle 57 protrudes with its mouth 59 into the area of the nozzle constriction 67 coaxially to the constriction cross section, as a result of which between the body 56 of the nozzle 57 and the wall of the flow channel 63 in the area 67 an annular nozzle 69 for the supply via line 3 or 32 Powder is created.
  • the axis A 32 of the feed line 3 or 32, the axis of the adjoining flow channel 63 and the axis of the nozzle 57 or of the section 61, A 57 lie in one plane.
  • FIG. 5 shows a schematic illustration in the view according to line V-V of FIGS. 3 and 4 .
  • the axis A 32 is arranged eccentrically with respect to the axis A 57 of the nozzle or the section 61.
  • the powder fed through line 3 or 32 is mixed in the mixing chamber 55 with a self-cleaning swirl, which leads to a vortex D, as shown schematically.

Landscapes

  • Nozzles (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
EP87116035A 1986-11-15 1987-10-31 Verfahren zur Erhöhung der ausgegebenen Pulvermenge an einer Pulverbeschichtungsanlage sowie Pulverbeschichtungsanlage Expired - Lifetime EP0268126B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87116035T ATE71859T1 (de) 1986-11-15 1987-10-31 Verfahren zur erhoehung der ausgegebenen pulvermenge an einer pulverbeschichtungsanlage sowie pulverbeschichtungsanlage.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863639139 DE3639139A1 (de) 1986-11-15 1986-11-15 Verfahren zur erhoehung der ausgegebenen pulvermenge an einer pulverbeschichtungsanlage sowie pulverbeschichtungsanlage
DE3639139 1986-11-15

Publications (3)

Publication Number Publication Date
EP0268126A1 EP0268126A1 (de) 1988-05-25
EP0268126B1 EP0268126B1 (de) 1992-01-22
EP0268126B2 true EP0268126B2 (de) 1997-06-25

Family

ID=6314072

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87116035A Expired - Lifetime EP0268126B2 (de) 1986-11-15 1987-10-31 Verfahren zur Erhöhung der ausgegebenen Pulvermenge an einer Pulverbeschichtungsanlage sowie Pulverbeschichtungsanlage

Country Status (7)

Country Link
US (1) US5018910A (enrdf_load_stackoverflow)
EP (1) EP0268126B2 (enrdf_load_stackoverflow)
JP (1) JP2651165B2 (enrdf_load_stackoverflow)
AT (1) ATE71859T1 (enrdf_load_stackoverflow)
DE (2) DE3639139A1 (enrdf_load_stackoverflow)
ES (1) ES2029679T5 (enrdf_load_stackoverflow)
GR (1) GR3003650T3 (enrdf_load_stackoverflow)

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Also Published As

Publication number Publication date
JPS63229171A (ja) 1988-09-26
JP2651165B2 (ja) 1997-09-10
DE3776282D1 (de) 1992-03-05
ES2029679T3 (es) 1992-09-01
EP0268126A1 (de) 1988-05-25
GR3003650T3 (en) 1993-03-16
ATE71859T1 (de) 1992-02-15
US5018910A (en) 1991-05-28
DE3639139A1 (de) 1988-05-26
DE3639139C2 (enrdf_load_stackoverflow) 1990-01-25
EP0268126B1 (de) 1992-01-22
ES2029679T5 (es) 1997-11-01

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