US2535451A - Painting device for round surfaces - Google Patents

Painting device for round surfaces Download PDF

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Publication number
US2535451A
US2535451A US784234A US78423447A US2535451A US 2535451 A US2535451 A US 2535451A US 784234 A US784234 A US 784234A US 78423447 A US78423447 A US 78423447A US 2535451 A US2535451 A US 2535451A
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tube
paint
air
painted
painting
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US784234A
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Festus C Phillips
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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
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/0207—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the work being an elongated body, e.g. wire or pipe
    • B05B13/0214—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the work being an elongated body, e.g. wire or pipe the liquid or other fluent material being applied to the whole periphery of the cross section of the elongated body
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
    • B05B13/0436—Installations or apparatus for applying liquid or other fluent material to elongated bodies, e.g. light poles, pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B05B1/20—Arrangements of several outlets along elongated bodies, e.g. perforated pipes or troughs, e.g. spray booms; Outlet elements therefor
    • B05B1/205—Arrangements of several outlets along elongated bodies, e.g. perforated pipes or troughs, e.g. spray booms; Outlet elements therefor characterised by the longitudinal shape of the elongated body
    • B05B1/207—Arrangements of several outlets along elongated bodies, e.g. perforated pipes or troughs, e.g. spray booms; Outlet elements therefor characterised by the longitudinal shape of the elongated body the elongated body being a closed loop
    • 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
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
    • 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
    • Y10S118/00—Coating apparatus
    • Y10S118/11—Pipe and tube outside

Definitions

  • This invention relates to paint spraying apparatus and has reference to a device for spraying convex surfaces.
  • An object of the invention is to provide a paint spraying device for painting large convex surfaces such as smokestacks, grain elevators, and the like.
  • Another object of the invention is to reduce the hazard of having a painter suspended for long periods of time on scaffolds and the like when smokestacks and the like are being painted.
  • a further object of the invention is to provide a device of the described class which will save time when used for painting or spraying the objects referred to.
  • Another object of the invention is to provide a paint spraying device for the described purpose in which the individual nozzles are uniformly spaced With respect to the surface being painted, even though the latter is tapered, such as the surface of a smokestack.
  • a further object of the invention is to provide, in a paint spraying device of the described class, spring tension and roller means whereby the device may be operated in spaced relation with reference to the surface being painted.
  • Figure 1 is a plan view of a circular paint spraying device engaged upon the outer surface of a cylindrical surface, such as a smokestack, and showing, by means of dotted lines, the spraying action of the device.
  • Figure 2 is a side elevational view of the device illustrated in Figure 1, and particularly showing the overlapping arrangement or the ends of the circular members whereby the device may be adapted to inclined or tapered surfaces, such as the illustrated fragmentary portion of a smokestack.
  • Figure 3 is a vertical sectional view of the paint spraying device taken on lines 3-3 of Figure 1.
  • Figure 4 is a schematic view illustrating the present device adapted to the painting of a tall structure, such as a smokestack.
  • Figure 5 is a side elevational view of one of the rollers forming a part of the invention.
  • Figure 6 is a broken sectional view of a portion of the circular paint supplying tube and showing a valve arrangement for closing certain of the nozzles when the device contracts and assumes a smaller diameter.
  • Figure 6 is taken on lines 6-6 of Figure 7.
  • Figure 7 is a vertical sectional view taken on lines 'I-'l of Figure 2, and
  • Figure 8 is a modified form of the invention adapted to painting convex surfaces of grain elevators in which the surfaces to be painted are not completely annular.
  • the form of the invention shown in Figure l includes a circular paint supply tube I having overlapping ends, as illustrated in Figure 2, which are closed', and which tube is provided with a tubular inlet 2 connected with a flexible supply hose 3.
  • the tube is of a spring material to cause the circle formed to contract under tension when the device is applied to an object having a diametervgreater than the diameter defined by the innermost points of the device when the latter is in its contracted position.
  • the inner periphery of the flexible tube I is provided withl a series of spaced spray units fi, the details of Which are shown in Figure 3, and each unit consisting of a tubular air jacket 5, secured to the surface of the said tube and provided With a tubular nozzle S therein communicating with the said tube.
  • Another ieXible tube l similar to the first described ileXible tube i, is secured to the air jackets 5 and is provided with ports 8 for communicating air to the said jackets.
  • Air is supplied to the circular air tube 'I by means of ak connection 9 and an air supply hose I.
  • The' operation of the spray units i consists of supplying paint to the tube I and air pressure to the circular air tube l. As the paint is forced out of the nozzle 6, the surrounding air jet atomizes the paint, causing a spray for covering the surface to be painted.
  • valves II As shown in Figures 2, 6, and 7, the ends of the circular tubes I and 'l are positioned one above the other and the nozzles 6 of the last two sprayer units 4 are provided with valves II.
  • the valves II consist of vertical bearings I2 in the lower surface of the tube I and are provided with stems I3 therethrough having cams i3d at their upper ends for engaging and closing the inner ends of the nozzles 6.
  • the last described operation is carried out by means of laterally projecting triggers I4 which are integral with and located outwardly of the stems I3 and are adapted to be engaged by the end of the lower circular air tube I when the device contracts, as will be referred to in the description of operation.
  • roller carriers I5 for supporting and spacing the device relative to the surface to be painted.
  • Each roller carrier I5 is comprised of a triangular hanger plate I6, a roller I'I rotatably supported at one corner of the plate, and a clamp member I8 pivoted to the plate at the said roller.
  • Each hanger plate I6 and clamp I8 is recessed to accommodate the diameters of the paint and air tubes I and l.
  • TheY clamp I8 is detachably secured to the ⁇ plate I,6 by means of;V a. s crewv and nut arrangement I9 at the corner of the described triangle opposite the roller I'I.
  • any suitable hoist means may be employed for raising and lowering the device; such as: illustrated in Figure 4.
  • supportelclI pulleys 20 are temporarily installed atfthe 'top of a smokestack 2
  • the rollers I'I are caused to engage thesurface 'of the s molre ⁇ stackv 2
  • Vthe device ⁇ may be clerz'ited-l from: ⁇ top tobottom of the structure tob'epaihted;
  • the tubesf25 ⁇ andV26 are flexible and may be shaped to thegcontour'ofthe surf/ace;
  • This form of theinvention ris" for painting convex "surfaces, such 'asf grain elevators '2-15, illustrated-in part in ligur'e.y rPhe lastdescribed form of the invention includes the rollercarrirsv I5 secured to for holdingthel tubes-25 andZIv iny the manner previously referredv to', andthe respective tubes are provided' with'paint and air .i
  • the spray action through the spray units 4 the surface is covered with a coat of paint.
  • a device for painting a cylindrical surface comprising a flexible annular paint supplying tube, the ends of which are arranged in overlapping-g relationwith respect to each other, inwardly directed nozzles supported by and communicating with the said tube, and roller means supported by the said tube for spacing the said nozzles from the. surface to be painted.
  • a device for painting a cylijndii calfsurfaceJ al. comprised of a length o fl tube in the form. of an annul'us and having the, ends thereof ⁇ arranged in overlapping relation ⁇ with re'- spect to each other, inwardly directed nozzles supported by and inr communication withy said' tube', a4 valve ⁇ including a. projecting trigger said valve being operatively.connectedwithone of 'said nozzles near 'one end' of said tubefor controlling thesuppl'y of fluid thereto, said trigger being arranged to be. contacted. and actuated by the, end
  • valve operated' nozzle is located; andspacer means supported bysaid tube for contacting. and spacing

Landscapes

  • Spray Control Apparatus (AREA)

Description

Dec. 26, 1950 F. c. PHILLIPS 2,535,451
PAINTING DEVICE FUR ROUND SURFACES Filed Nov. 5, 1947 2 Sheets-Sheet l I l lil F. C. Pff/UPS INVENTOR ATTORNEY Dec. 26, 195o F. c. PHILLIPS 2,535,451
K PAINTING DEVICE FOR ROUND SURFACES Filed Nov. 5, 1947 2 Sheets-Sheet 2 INVENTOR ATTORNEY Patented Dec. 26, 1950 UNITED STATES PATENT OFFICE 3 Claims.
This invention relates to paint spraying apparatus and has reference to a device for spraying convex surfaces.
An object of the invention is to provide a paint spraying device for painting large convex surfaces such as smokestacks, grain elevators, and the like.
Another object of the invention is to reduce the hazard of having a painter suspended for long periods of time on scaffolds and the like when smokestacks and the like are being painted.
A further object of the invention is to provide a device of the described class which will save time when used for painting or spraying the objects referred to.
Another object of the invention is to provide a paint spraying device for the described purpose in which the individual nozzles are uniformly spaced With respect to the surface being painted, even though the latter is tapered, such as the surface of a smokestack.
A further object of the invention is to provide, in a paint spraying device of the described class, spring tension and roller means whereby the device may be operated in spaced relation with reference to the surface being painted. f
These and other objects of the invention will become apparent from the following description of the accompanying drawings of exemplary forms of the invention, wherein:
Figure 1 is a plan view of a circular paint spraying device engaged upon the outer surface of a cylindrical surface, such as a smokestack, and showing, by means of dotted lines, the spraying action of the device.
Figure 2 is a side elevational view of the device illustrated in Figure 1, and particularly showing the overlapping arrangement or the ends of the circular members whereby the device may be adapted to inclined or tapered surfaces, such as the illustrated fragmentary portion of a smokestack.
Figure 3 is a vertical sectional view of the paint spraying device taken on lines 3-3 of Figure 1.
Figure 4 is a schematic view illustrating the present device adapted to the painting of a tall structure, such as a smokestack.
Figure 5 is a side elevational view of one of the rollers forming a part of the invention.
Figure 6 is a broken sectional view of a portion of the circular paint supplying tube and showing a valve arrangement for closing certain of the nozzles when the device contracts and assumes a smaller diameter. Figure 6 is taken on lines 6-6 of Figure 7.
Figure 7 is a vertical sectional view taken on lines 'I-'l of Figure 2, and
Figure 8 is a modified form of the invention adapted to painting convex surfaces of grain elevators in which the surfaces to be painted are not completely annular.
The form of the invention shown in Figure l includes a circular paint supply tube I having overlapping ends, as illustrated in Figure 2, which are closed', and which tube is provided with a tubular inlet 2 connected with a flexible supply hose 3. The tube is of a spring material to cause the circle formed to contract under tension when the device is applied to an object having a diametervgreater than the diameter defined by the innermost points of the device when the latter is in its contracted position.
The inner periphery of the flexible tube I is provided withl a series of spaced spray units fi, the details of Which are shown in Figure 3, and each unit consisting of a tubular air jacket 5, secured to the surface of the said tube and provided With a tubular nozzle S therein communicating with the said tube. Another ieXible tube l, similar to the first described ileXible tube i, is secured to the air jackets 5 and is provided with ports 8 for communicating air to the said jackets. Air is supplied to the circular air tube 'I by means of ak connection 9 and an air supply hose I. The' operation of the spray units i consists of supplying paint to the tube I and air pressure to the circular air tube l. As the paint is forced out of the nozzle 6, the surrounding air jet atomizes the paint, causing a spray for covering the surface to be painted.
As shown in Figures 2, 6, and 7, the ends of the circular tubes I and 'l are positioned one above the other and the nozzles 6 of the last two sprayer units 4 are provided with valves II. The valves II consist of vertical bearings I2 in the lower surface of the tube I and are provided with stems I3 therethrough having cams i3d at their upper ends for engaging and closing the inner ends of the nozzles 6. The last described operation is carried out by means of laterally projecting triggers I4 which are integral with and located outwardly of the stems I3 and are adapted to be engaged by the end of the lower circular air tube I when the device contracts, as will be referred to in the description of operation. Upon contraction the abutting end of the lower air tube 'l first actuates the trigger I nearest the same, and upon further movement actuates the second trigger, thus closing the valve units II successively.
The assembled paint and air tubes I and 'I are provided with roller carriers I5, as shown in Figure 5, for supporting and spacing the device relative to the surface to be painted. Each roller carrier I5 is comprised of a triangular hanger plate I6, a roller I'I rotatably supported at one corner of the plate, and a clamp member I8 pivoted to the plate at the said roller. Each hanger plate I6 and clamp I8 is recessed to accommodate the diameters of the paint and air tubes I and l. TheY clamp I8 is detachably secured to the` plate I,6 by means of;V a. s crewv and nut arrangement I9 at the corner of the described triangle opposite the roller I'I.
Any suitable hoist means may be employed for raising and lowering the device; such as: illustrated in Figure 4. In the latten. supportelclI pulleys 20 are temporarily installed atfthe 'top of a smokestack 2|, and ropesl2'2`faeusedi'ncon nection with the pulleys for attaching hoplgs 23, at the ends of the ropes in holes 24 in the upper corners of the plates I6. By reason of the spring tension of the circular tubes I` andv'l, the rollers I'I are caused to engage thesurface 'of the s molre` stackv 2|. The described form-of the invention maybe applied rst to the base ofthe smolestack' 2I to be painted, and movedA upwardly inj order that the spray valves II may opera-te lsveparate1y in the manner described; In other forms off' the invention, Vthe device` may be clerz'ited-l from:` top tobottom of the structure tob'epaihted;
The form ofthe inventionshown in ligurel 8v1is similar to the; one previouslyi described but' con`` sists'ofarcuate tubes 25 and-26A whichl correspond- With the described paint vand airftubes 'I and 1,
respectively, but Which tubes do-notdefineafcom- 5 plete circle.y The tubesf25` andV26 are flexible and may be shaped to thegcontour'ofthe surf/ace;
to be painted, but are not necessarily of; springv material. This form of theinvention ris" for painting convex "surfaces, such 'asf grain elevators '2-15, illustrated-in part in ligur'e.y rPhe lastdescribed form of the invention includes the rollercarrirsv I5 secured to for holdingthel tubes-25 andZIv iny the manner previously referredv to', andthe respective tubes are provided' with'paint and air .i
supply hoses 3 and- II); as previously described;
The operation of thelastdescribed form'cf-Fthe convex surfaces to be painted, andjby reasonof;
the spray action through the spray units 4, the surface is covered with a coat of paint.
The form of the invention shown and described is not restrictive but may be made in many ways within the scope of the appended claims.
What is claimed is:
1. A device for painting a cylindrical surface, comprising a flexible annular paint supplying tube, the ends of which are arranged in overlapping-g relationwith respect to each other, inwardly directed nozzles supported by and communicating with the said tube, and roller means supported by the said tube for spacing the said nozzles from the. surface to be painted.
2: A'devi'ce for painting a cylindrical surface, comprsl am annular exible paint supply tube of springmaterial arranged for reducing the diameter' of the annulus formed by said tube, inwardly: directed nozzles supported by and communicating with said tube, and spacing means supported.byy said tube and arranged for spacing said, nozzlesffromthe surface to be painted.
3. In a device for painting a cylijndii calfsurfaceJ al. supply tubel comprised of a length o fl tube in the form. of an annul'us and having the, ends thereof` arranged in overlapping relation` with re'- spect to each other, inwardly directed nozzles supported by and inr communication withy said' tube', a4 valve` including a. projecting trigger said valve being operatively.connectedwithone of 'said nozzles near 'one end' of said tubefor controlling thesuppl'y of fluid thereto, said trigger being arranged to be. contacted. and actuated by the, end
ofY said tube other than the, end. in which said.`
valve operated' nozzle is located; andspacer means supported bysaid tube for contacting. and spacing
US784234A 1947-11-05 1947-11-05 Painting device for round surfaces Expired - Lifetime US2535451A (en)

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2821162A (en) * 1954-12-09 1958-01-28 Andrew C Robinson Pole coating apparatus
US2857622A (en) * 1953-11-10 1958-10-28 American Vitrified Products Co Apparatus for making sealing means for sewer pipe joints
US3306310A (en) * 1965-02-15 1967-02-28 Byron Jackson Inc System for spraying drill pipe
US5207833A (en) * 1991-11-29 1993-05-04 Commercial Resins Company Line travel spray coating device
US5352292A (en) * 1993-01-04 1994-10-04 The Kendall Company Apparatus for coating exterior weld joints of a pipe
US5674121A (en) * 1994-12-13 1997-10-07 Minnesota Mining And Manufacturing Company Core having an outer surface for receiving adhesive
US6626376B1 (en) 2001-06-14 2003-09-30 Airtech Spray Systems, Inc. Spray coating device
US9061299B1 (en) * 2012-04-24 2015-06-23 Attila P. Fodor Spray paint can spraying accessory
CN105195370A (en) * 2015-10-16 2015-12-30 宝汇建设工程有限公司 Steel pipe outer surface paint spraying and sand spraying combined device
CN105195367A (en) * 2015-10-16 2015-12-30 宝汇建设工程有限公司 Paint spraying device for outer surface of steel pipe
CN105435978A (en) * 2016-01-20 2016-03-30 中国工程物理研究院化工材料研究所 Spray head for stirring device
US9339670B1 (en) * 2013-03-15 2016-05-17 Robert J Burnham Vertical pole spraying system
CN110787943A (en) * 2019-07-31 2020-02-14 大港油田集团有限责任公司 Automatic spraying device for water-containing instrument inner core
CN111545403A (en) * 2020-04-26 2020-08-18 京仪股份有限公司 Cable protection layer brushing device applied to extreme environment
US10940499B2 (en) * 2016-07-22 2021-03-09 David S Pletcher Tube spray gun
CN115138498A (en) * 2022-06-08 2022-10-04 东莞市昕冠精密技术有限公司 Homogeneity spraying equipment is used in face-piece processing

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1611920A (en) * 1926-12-28 Machine fob cleaning and reconditioning pipe
US1850238A (en) * 1929-05-31 1932-03-22 Fisk Rubber Co Apparatus for spraying annular articles
US1960725A (en) * 1931-12-14 1934-05-29 Binks Mfg Co Pipe spraying appliance
US2286316A (en) * 1937-06-26 1942-06-16 Honeywell Regulator Co Air conditioning
US2357144A (en) * 1942-03-16 1944-08-29 Carlyle B Stair Surface treating apparatus for poles

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1611920A (en) * 1926-12-28 Machine fob cleaning and reconditioning pipe
US1850238A (en) * 1929-05-31 1932-03-22 Fisk Rubber Co Apparatus for spraying annular articles
US1960725A (en) * 1931-12-14 1934-05-29 Binks Mfg Co Pipe spraying appliance
US2286316A (en) * 1937-06-26 1942-06-16 Honeywell Regulator Co Air conditioning
US2357144A (en) * 1942-03-16 1944-08-29 Carlyle B Stair Surface treating apparatus for poles

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2857622A (en) * 1953-11-10 1958-10-28 American Vitrified Products Co Apparatus for making sealing means for sewer pipe joints
US2821162A (en) * 1954-12-09 1958-01-28 Andrew C Robinson Pole coating apparatus
US3306310A (en) * 1965-02-15 1967-02-28 Byron Jackson Inc System for spraying drill pipe
US5207833A (en) * 1991-11-29 1993-05-04 Commercial Resins Company Line travel spray coating device
US5352292A (en) * 1993-01-04 1994-10-04 The Kendall Company Apparatus for coating exterior weld joints of a pipe
US5674121A (en) * 1994-12-13 1997-10-07 Minnesota Mining And Manufacturing Company Core having an outer surface for receiving adhesive
US5695559A (en) * 1994-12-13 1997-12-09 Minnesota Mining And Manufacturing Company Apparatus for coating adhesive onto a core
US6626376B1 (en) 2001-06-14 2003-09-30 Airtech Spray Systems, Inc. Spray coating device
US9061299B1 (en) * 2012-04-24 2015-06-23 Attila P. Fodor Spray paint can spraying accessory
US9339670B1 (en) * 2013-03-15 2016-05-17 Robert J Burnham Vertical pole spraying system
CN105195370A (en) * 2015-10-16 2015-12-30 宝汇建设工程有限公司 Steel pipe outer surface paint spraying and sand spraying combined device
CN105195367A (en) * 2015-10-16 2015-12-30 宝汇建设工程有限公司 Paint spraying device for outer surface of steel pipe
CN105435978A (en) * 2016-01-20 2016-03-30 中国工程物理研究院化工材料研究所 Spray head for stirring device
CN105435978B (en) * 2016-01-20 2018-03-23 中国工程物理研究院化工材料研究所 Shower nozzle for mixing plant
US10940499B2 (en) * 2016-07-22 2021-03-09 David S Pletcher Tube spray gun
CN110787943A (en) * 2019-07-31 2020-02-14 大港油田集团有限责任公司 Automatic spraying device for water-containing instrument inner core
CN111545403A (en) * 2020-04-26 2020-08-18 京仪股份有限公司 Cable protection layer brushing device applied to extreme environment
CN115138498A (en) * 2022-06-08 2022-10-04 东莞市昕冠精密技术有限公司 Homogeneity spraying equipment is used in face-piece processing
CN115138498B (en) * 2022-06-08 2023-08-04 东莞市昕冠精密技术有限公司 Homogeneous spraying equipment for processing face shells

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