EP2508267B1 - Reversible coating material nozzle for a spray gun for coating a workpiece with coating material - Google Patents

Reversible coating material nozzle for a spray gun for coating a workpiece with coating material Download PDF

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Publication number
EP2508267B1
EP2508267B1 EP11405240.0A EP11405240A EP2508267B1 EP 2508267 B1 EP2508267 B1 EP 2508267B1 EP 11405240 A EP11405240 A EP 11405240A EP 2508267 B1 EP2508267 B1 EP 2508267B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
coating material
spray gun
nipple
coating
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.)
Active
Application number
EP11405240.0A
Other languages
German (de)
French (fr)
Other versions
EP2508267A1 (en
Inventor
Jürgen Ghesla
Rolf Mazenauer
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.)
J Wagner AG
Original Assignee
J Wagner 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
Application filed by J Wagner AG filed Critical J Wagner AG
Priority to EP11405240.0A priority Critical patent/EP2508267B1/en
Priority to ES11405240.0T priority patent/ES2498920T3/en
Priority to PL11405240T priority patent/PL2508267T3/en
Priority to US14/009,355 priority patent/US9433953B2/en
Priority to PCT/CH2012/000078 priority patent/WO2012135966A1/en
Priority to CN201280015272.8A priority patent/CN103459045B/en
Publication of EP2508267A1 publication Critical patent/EP2508267A1/en
Application granted granted Critical
Publication of EP2508267B1 publication Critical patent/EP2508267B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/52—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter for removal of clogging particles
    • B05B15/531—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter for removal of clogging particles using backflow
    • B05B15/534—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter for removal of clogging particles using backflow by reversing the nozzle relative to the supply conduit
    • 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
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
    • 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
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
    • B05B7/0815—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter
    • 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
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
    • B05B1/042—Outlets having two planes of symmetry perpendicular to each other, one of them defining the plane of the jet
    • 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
    • B05B13/0405—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 with reciprocating or oscillating spray heads
    • B05B13/041—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 with reciprocating or oscillating spray heads with spray heads reciprocating along a straight line
    • 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
    • B05B13/0431—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 with spray heads moved by robots or articulated arms, e.g. for applying liquid or other fluent material to 3D-surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/01—Spray pistols, discharge devices

Definitions

  • the invention relates to a reversible coating material nozzle for a spray gun for coating a workpiece with coating material.
  • a spray gun When coating a workpiece with a coating material, such as a paint, a spray gun is often used which sprays the pressurized coating material through a coating material nozzle. In particular, if there are dirt particles in the coating material, it may happen that the coating material nozzle clogged. If the spray gun is still used, either no more coating material or only an insufficient amount can be sprayed. The coating material nozzle must then be cleaned. For this purpose, the trigger of the spray gun is locked, for example with a trigger lock, so that no coating material can escape from the spray gun. In an electrostatic spray gun is additionally ensured by the arrest of the trigger that no high voltage is applied to the high voltage electrode. Then the coating material nozzle can be removed.
  • a coating material such as a paint
  • the clogged coating material nozzle must manually, for example with solvent and a fine cleaning needle getting cleaned. Subsequently, the coating material nozzle must be reinstalled in the spray gun. After the trigger lock is released again, the spray gun is ready for use again. This process takes a long time. During manual cleaning, the coating material nozzle may be damaged and replaced with a new nozzle. In addition, it can happen that the clogged coating material nozzle can not be cleaned manually and then also has to be replaced.
  • An object of the invention is to provide a reversible coating material nozzle for a spray gun for coating workpieces with coating material which is designed so that it can both serve for coating a workpiece and is also self-cleaning if required.
  • a further object of the invention is to be able to remove the coating material nozzle, despite its small dimensions, without additional tools, ie only by hand, from the spray gun head and to be able to install it in the spray gun head.
  • the coating material nozzle is easily removable from the spray gun and automatically centered during installation itself.
  • the object is achieved by a reversible coating material nozzle for a spray gun for coating workpieces with coating material having the features specified in claim 1.
  • the inventive reversible coating material nozzle for a spray gun for coating a workpiece with coating material is designed so that it can be installed in a first and a second mounting position in a nozzle holder of the spray gun. It comprises a nozzle core with a nozzle core opening and a nozzle nipple with a nozzle nipple opening that is positively connected to the nozzle core.
  • a nozzle channel for the coating material is provided which extends through the nozzle nipple and the nozzle core and connects the nozzle nipple opening with the nozzle core opening.
  • the nozzle nipple has a cylindrical portion which forms a positive connection in the first mounting position with the nozzle holder of the spray gun.
  • an axial stop is provided. The ratio between the length from the stop to the cylindrical portion and the nozzle diameter is in the range between 0.75 and 2.00.
  • the ratio between the length and the nozzle diameter is in the range between 0.80 and 1.35.
  • the nozzle nipple has a cone which, in the first installation position, forms a positive connection with the nozzle receptacle of the spray gun.
  • the nozzle core also has a cone, which forms a positive connection in the second mounting position with the nozzle holder.
  • the nozzle nipple is made of plastic. This has the advantage that the nozzle nipple can be manufactured from a low-cost material and by injection molding.
  • the nozzle core is made of hard metal or ceramic. This extends the service life of the nozzle.
  • abrasive coating material can be sprayed.
  • the nozzle nipple has a further cylindrical section which forms a positive connection with the nozzle core. Tolerances in the production of this section do not play a special role. Even a possible material compression is uncritical or even conducive to the tightness.
  • a seal is provided between the nozzle core and the nozzle nipple.
  • a nozzle holder which holds together the nozzle core and the nozzle nipple.
  • the nozzle nipple may be made of hard metal or ceramic. This can further increase the service life of the coating material nozzle.
  • the nozzle holder is made of plastic.
  • Such a coating material nozzle can be inexpensively produced by injection molding.
  • connection between the nozzle holder and the nozzle nipple in the inventive coating material nozzle is proposed to form the connection between the nozzle holder and the nozzle nipple in the inventive coating material nozzle as a snap connection. This also facilitates the production.
  • the nozzle holder and the nozzle nipple can be connected to each other by gluing, welding or by a pressing operation.
  • the plastic can be designed to be electrically non-conductive.
  • a coating material nozzle can be used in an electrostatic spray gun.
  • the non-conductive plastic is achieved so that the electrical charge of the high-voltage electrode on the spray gun head does not reach the housing of the spray gun. It also ensures that there is no undue increase in capacity compared to the earth potential. A sudden discharge is prevented.
  • this also has the advantage that the smaller capacity of metal reduces the electrical capacitance of the coating nozzle. As a result, not so much electrical charge can be stored, the risk of sudden discharge is reduced.
  • a shoulder is provided which has a diameter of at least 5 mm and a maximum of 15 mm and forms an axial stop.
  • the nozzle nipple is an injection-molded part which partially encloses the nozzle core.
  • This embodiment is inexpensive and easy to produce.
  • the shoulder can be designed such that it forms a positive connection with an air cap of the spray gun in the installed state. If the air cap is rotated about its longitudinal axis, the coating material nozzle rotates. This is particularly advantageous when the nozzle core opening is slit-shaped. In this way, the flat jet generated by the coating material nozzle can be rotated and attached to the be adapted to the particular needs of the coating.
  • the lateral surface of the shoulder has a flat surface.
  • the flat surface of the shoulder is brought into registry with the flat surface of the air cap.
  • the spray gun according to the invention for coating a workpiece with coating material has a coating material nozzle which is designed as described above.
  • the nozzle receptacle has a bore for receiving the nozzle nipple.
  • the spray gun has a high voltage electrode.
  • the coating material nozzle according to the invention can be used in a spray gun for coating a workpiece with coating material.
  • a method for operating the spray gun described above for coating a workpiece with coating material is proposed in which the coating material nozzle is installed in the first installation position in the spray gun when the spray gun is to operate in the coating operation.
  • the coating material nozzle becomes installed in the second installation position in the spray gun.
  • FIG. 1 shows an embodiment of the inventive spray gun 1 with a first embodiment of the inventive reversible coating material nozzle 20 in side view.
  • the coating material nozzle 20 will hereinafter be referred to simply as a nozzle for the sake of simplicity.
  • the spray gun 1 comprises a gun housing 14, which is also referred to below as the housing of the spray gun.
  • a spray gun head 6 At the front end of the spray gun 1 is a spray gun head 6. A part of it is in FIG. 1 shown in section.
  • the spray gun head 6 is screwed with a union nut 7 on the gun housing 14.
  • Inside the spray gun head 6 is a coating material nozzle 20, which in the FIGS. 1, 2 and 3 is shown in a first mounting position.
  • the coating material nozzle 20 is held with the union nut 7 in the spray gun head 6.
  • the spray gun head 6 includes a nozzle guard 8, which is optional. It reduces the risk that the personnel will be immediately at the nozzle outlet 24 of the coating material nozzle 20 (see FIG. 3 ) comes into contact with the coating material. Contact with the coating material is to be avoided especially there, because the coating material there may cause injuries due to the high pressure, and when it comes into direct contact with the skin, can penetrate into the skin.
  • the nozzle guard 8 thus reduces the risk that the coating material can penetrate into the skin, and a possible damaging effect is minimized.
  • the nozzle guard 8 is also referred to below as contact protection and comprises a plurality of spacers 8.1 and 8.2. At the in FIG. 1 shown embodiment, the contact protection 8 four spacers, wherein due to the sectional view only two can be seen.
  • the contact protection can also be equipped with only two or three spacers. In addition, it is possible to provide five or more spacers.
  • the spray gun 1 further has a connection for compressed air 4.
  • the compressed air can be directed to the coating material jet as required by forming air channels 11 and 12, which are located in the downstream area in an air cap 10 of the spray head 8. With the help of compressed air, the shape of the coating material beam can be adjusted.
  • the spray gun 1 comprises an electrical connection 5, via which an electrode 15 on the spray gun head 6 can be supplied with high voltage.
  • the high voltage serves to ionize the coating material.
  • a spray gun designed in this way is also referred to below as an electrostatic gun.
  • the spray gun 1 also comprises a trigger guard 2.
  • a valve arranged in the spray gun 1 is opened via a valve rod, so that the coating material reaches the coating material nozzle 20 and is sprayed through it.
  • a trigger lock 16 of the trigger guard 2 can be locked. In the locked state, the trigger guard 2 can not be operated more so that no coating material can be sprayed.
  • FIG. 2 shows the spray head 6 of the spray gun 1 from FIG. 1 with the coating material nozzle 20 in a first installation position in an enlarged view partially in section.
  • FIG. 3 shows a section of the spray head 6 with the coating material nozzle 20 in the first installation position in an even more enlarged view. Is the coating material nozzle 20 in the first installation position, as in the FIGS. 1, 2 and 3 is shown, the spray gun 1 operates in the coating mode or coating mode. With the spray gun 1 now workpieces can be coated with coating material.
  • the cylindrical portion 22.4 of the nozzle nipple 22 is inserted in a nozzle holder 9, which has a correspondingly large bore 9.4.
  • the cylindrical portion 22.4 forms a positive connection together with the bore 9.4.
  • the pressurized coating material flows through the material channel 9.2, it presses the cylindrical portion 22.4 against the wall of the bore 9.4 and thus ensures an improved seal at the transition between the material channel 9.2 and the nozzle nipple 22.
  • the coating material nozzle 20 often removed and is used again, the sealing effect remains unchanged.
  • Slightly conical in this context means that the angle between the longitudinal axis and the cone is between 0 and 5 °. This means that the deviation from an exactly mathematical cylindrical shape should not exceed 5 °.
  • the nozzle nipple 22 also has a cone 22.1, which forms a further positive connection with a likewise inclined surface 9.1 of the nozzle holder 9.
  • the inclined surface 9.1 helps to introduce the nozzle nipple 22.4 in the bore 9.4 of the nozzle holder 9.
  • a nozzle core 23 At the downstream end of the coating material nozzle 20 is a nozzle core 23.
  • the coating material is when the trigger lever 2 is actuated through the hole 9.2 (which also serves as coating material channel) and the coating material channel 26 to the nozzle core opening 24 and sprayed there.
  • FIG. 4 shows the spray head 6 of the spray gun 1 from FIG. 1 with the coating material nozzle 20 in a second mounting position in an enlarged view partially in section.
  • the coating material nozzle 20 is rotated by 180 ° in the spray head 6 installed.
  • the cone 23.1 of the nozzle core 23 now forms together with the inclined surface 9.1 of the nozzle holder 9 a positive connection. If now the trigger 2 of the spray gun 1 is actuated, the coating material first flows through the nozzle core opening 24 of the coating material nozzle 20 and takes deposits with, the are in the region of the nozzle core opening 24. The deposits are pushed out of the spray gun 1 through the nozzle nipple opening 25.
  • the coating material nozzle 20 is cleaned and can be brought back into the first installation position.
  • the union nut 7 is unscrewed from the spray gun housing 14, the coating material nozzle 20 taken out, rotated by 180 ° and back in the nozzle holder 9 inserted.
  • the union nut 7 is screwed onto the spray gun housing 14 and the spray gun 1 is ready for use again to coat the next workpieces.
  • FIG. 5a shows the first embodiment of the coating material nozzle 20 in the side view and FIG. 5c shows this in plan view.
  • FIG. 5b shows the first embodiment of the coating material nozzle 20 in cross-section from the side and FIG. 5d in cross-section from above.
  • FIG. 5e shows the first embodiment of the coating material nozzle 20 in the front view.
  • the nozzle holder 21 is formed so that it holds the nozzle nipple 22 and the nozzle core 23 together.
  • the connection of the nozzle holder 21 with the nozzle nipple 22 may be formed as a snap connection 21.3, 22.3.
  • the nozzle holder 21 has for this purpose a resilient element or a snapper 21.3, which engages in a groove 22.3 of the nozzle nipple 22.
  • the nozzle holder 21 may be made of plastic. Such a coating material nozzle 20 can be inexpensively produced by injection molding.
  • the plastic from which the nozzle holder 21 and / or the nozzle nipple 22 are made is preferably an electrically non-conductive plastic.
  • the non-conductive plastic ensures that the electrical charge of the high-voltage-carrying electrode 15 on the spray gun head 6 does not reach the housing 14 of the spray gun 1. It also ensures that there is no undue increase in capacity compared to the earth potential comes. A sudden discharge is prevented.
  • a different electrically non-conductive material can be used. Such a coating material nozzle can be used in an electrostatic spray gun.
  • the plastic may also be electrically conductive, or metal may be used instead of the plastic.
  • Such a coating material nozzle can be used in a non-electrostatic spray gun. This coating material nozzle can also be used in an electrostatic spray gun when the spray gun is operated without electrostatics.
  • the nozzle holder 21 also includes a shoulder 21.5, which serves as an axial stop. It extends between paragraph 21.8 and paragraph 21.7.
  • the coating material nozzle 20 preferably has an outer diameter D of at least 5 mm and a maximum of 15 mm. In a preferred embodiment, the outer diameter D is 11 mm.
  • the shoulder 21.5 is positioned with respect to the cone 23.1 of the nozzle core 23 and the cone 22.1 of the nozzle nipple 22 in the axial direction so that the mass L1 and L2 are approximately equal.
  • the dimension L1 is defined as the distance between the shoulder 21.8 and the cone 23.1.
  • the dimension L2 is defined as the distance between the shoulder 21.7 and the cone 22.1.
  • the shoulder 21.7 forms an axial stop on the shoulder 21.5. If the union nut 7 is screwed onto the housing 14 of the spray gun, the union nut 7 presses the cone 22.1 of the coating material nozzle 20 onto the nozzle holder 9 via the axial stop 21.7.
  • the other shoulder 21.8 of the shoulder 21.5 forms an axial stop. If the union nut 7 is screwed onto the housing 14 of the spray gun, the union nut 7 presses the cone 23.1 of the nozzle core 23 onto the nozzle receptacle 9 via the axial stop 21.8.
  • the coating material channel 26 passes through the nozzle nipple 22 and the nozzle core 23 and connects the nozzle nipple opening 25 with the nozzle core opening 24.
  • a seal (not shown in the figures) may be provided between the nozzle core 22 and the nozzle nipple 23.
  • the seal may be formed as an axial seal, for example as an O-ring.
  • the seal can, as in the FIGS. 5b and 5d can be improved by the nozzle nipple 22 has a cylindrical portion 22.5 which projects into the nozzle core 23. As soon as the coating material flows through the nozzle channel 26, it pushes the section 22.5 against the channel wall 23.2 of the nozzle core 23 and thus ensures an improved seal at the channel transition between the nozzle nipple 22 and the nozzle core 23.
  • the coating material nozzle 20 has a length L in the range of 10.0 mm to 14.6 mm, and preferably 12.3 mm.
  • the nozzle diameter is preferably 11 mm.
  • the dimensions of the coating material nozzle 20 are relatively small, but you can still grab them by hand.
  • the coating material nozzle 20 can be optimally installed in the spray gun head 6. If the ratio L / D outside the range specified above, the coating material nozzle 20 can tilt both during removal and installation in the spray gun head 6, so that the installation or removal without additional tools if at all, then only with difficulty and relatively much Time and patience needed.
  • FIG. 6a shows a second embodiment of the coating material nozzle 30 in side view and FIG. 6c in the plan view.
  • FIG. 6b shows the second embodiment of the coating material nozzle 30 in cross-section from the side and FIG. 6d in cross-section from above.
  • FIG. 6e shows the second embodiment of the coating material nozzle 30 in the front view.
  • the second embodiment of the coating material nozzle 30 differs from the first embodiment essentially in that the nozzle nipple 32 is not only positively connected to the nozzle core 33, but also positively connected.
  • the nozzle nipple 32 is shaped and formed, that he also takes over the function of the nozzle holder 21.
  • the nozzle nipple 32 includes a shoulder 32.5, which serves as an axial stop. It is located approximately in the middle of the coating material nozzle 30 and extends from paragraph 32.8 to paragraph 32.7. In the region of the shoulder 32.5, the coating material nozzle 30 preferably has an outer diameter of at least 5 mm and a maximum of 15 mm.
  • the other shoulder 32.8 of the shoulder 32.5 forms an axial stop. If the union nut 7 is screwed onto the housing 14 of the spray gun, the union nut 7 presses on the axial stop 32.8 the cone 33.1 of the nozzle core 33 on the nozzle holder 9 (see also FIG. 4 ).
  • the coating material nozzle 30 has a length L in the range of 7.3 mm to 11.3 mm, and preferably of 9.3 mm.
  • the nozzle diameter D is preferably 9 mm.
  • the dimensions of the coating material nozzle 30 are relatively small, but they can still be reached by hand.
  • the coating material nozzle 20 can be optimally installed in the spray gun head 6. If the ratio L / D outside the range specified above, the coating material nozzle 30 - as already mentioned - tilt both during removal and installation in the spray gun head 6, so that the installation or removal without additional tools if anything, then only with difficulty is possible and requires a lot of time and patience.
  • the material from which the nozzle nipple 32 is made is preferably electrically non-conductive. It is thereby achieved that the electrical charge of the high-voltage-carrying electrode 15 on the spray gun head 6 does not reach the housing 14 of the spray gun 1. It also ensures that there is no undue increase in capacity compared to the earth potential. A sudden discharge is prevented.
  • the nozzle nipple 32 thus serves for the electrical insulation between the high-voltage-carrying components and the generally grounded components of the spray gun 1.
  • Such a coating material nozzle can be used in an electrostatic spray gun.
  • the nozzle nipple 32 may be an injection molded part that partially encloses the nozzle core 33. This embodiment is inexpensive and easy to produce.
  • the tightness between the nozzle nipple 32 and the nozzle core 33 can, as in the Figures 6b and 6d can be improved by the nozzle nipple 32 has a cylindrical portion 32.9 which projects into the nozzle core 33.
  • the coating material flows through the nozzle channel 26, it presses the section 32.9 against the channel wall 33.2 of the nozzle core 33 and thus ensures an improved seal at the channel transition between the nozzle nipple 32 and the nozzle core 33.
  • a seal in the FIGS. 6a to 6e not shown, may be provided between the nozzle nipple 32 and the nozzle core 33.
  • the seal may be formed as an axial seal, for example as an O-ring.
  • the cylindrical sections 22.4, 22.5, 32.4 and 32.9 of the nozzle nipples 22 and 32 additionally have the advantage that they are not susceptible to tolerances and material compression.
  • the nozzle cores 23 and 33 may be made of hard metal or ceramic. Thus, the life of the coating material nozzles 20 and 30 is extended. In addition, abrasive coating material can also be sprayed with such coating material nozzles without resulting in excessive wear.
  • the nozzle nipples 22 and 32 may also be made of cemented carbide or ceramic. Thus, the life of the coating material nozzles 20 and 30 can be further increased.
  • the angles ⁇ , ⁇ and ⁇ (see Figures 3 5d ) matched.
  • the angle ⁇ denotes the angle between the longitudinal axis 27 and the slope of the cone 9.1 (inner cone) of the nozzle holder 9.
  • the angle ⁇ denotes the angle between the longitudinal axis 27 and the slope of the cone 22.1 (outer cone).
  • the angle ⁇ finally denotes the angle between the longitudinal axis 27 and the slope of the cone 23.1 (outer cone). If all three angles ⁇ , ⁇ and ⁇ are approximately equal, the cones 22.1 and 9.1 or 23.1 and 9.1 can be used as a stop and / or as a seal. The same applies mutatis mutandis to the coating material nozzle 30th
  • the shoulder 21.5 or 32.5 can be formed in both the coating material nozzle 20 and the coating material nozzle 30 such that it forms a positive connection with the air cap 10 of the spray gun 1.
  • the coating material nozzle 20 or 30 rotates with it. This is particularly advantageous when the nozzle core opening 24 is slit-shaped.
  • the flat jet generated by the coating material nozzle 20 or 30 can be rotated and adapted to the particular needs of the coating.
  • This can be like in the FIGS. 5a-5e and 6a - 6e shown the outer surface of the shoulder 21.5 and 32.5 have a flat surface 21.6 and 32.6, respectively.
  • the flat surface is brought 21.6 or 32.6 of the shoulder with the flat surface of the air cap 10 to cover.
  • the spray gun 1 If the coating material nozzle 20 or 30 is installed in the first installation position in the spray gun, the spray gun 1 operates in the coating operation, so that workpieces can be coated. If, on the other hand, the coating material nozzle 20 or 30 of the spray gun 1 is to be cleaned, the coating material nozzle is installed in the spray gun 1 in the second installation position.
  • the two angles ⁇ and ⁇ of the cones 22.1 and 23.1 of the coating material nozzle 20 or the two angles ⁇ and ⁇ of the cones 32.1 and 33.1 of the coating material nozzle 30 are approximately equal.
  • the inventive coating material nozzle can also be used in a spray gun without compressed air support. In such a spray gun, the compressed air connection 4 is missing.
  • the inventive coating material nozzle can also be used in an automatic spray gun.
  • An automatic spray gun is understood to mean a spray gun which is not held by hand but is fastened or fixedly installed, for example, on a robot or a linear guide.

Description

Technisches GebietTechnical area

Die Erfindung betrifft eine umkehrbare Beschichtungsmaterialdüse für eine Spritzpistole zum Beschichten eines Werkstücks mit Beschichtungsmaterial.The invention relates to a reversible coating material nozzle for a spray gun for coating a workpiece with coating material.

Beim Beschichten eines Werkstücks mit einem Beschichtungsmaterial, wie beispielsweise einem Lack, wird häufig eine Spritzpistole eingesetzt, die das unter Druck stehende Beschichtungsmaterial durch eine Beschichtungsmaterialdüse versprüht. Insbesondere wenn sich im Beschichtungsmaterial Schmutzpartikel befinden, kann es vorkommen, dass die Beschichtungsmaterialdüse verstopft. Wird die Spritzpistole weiterhin benutzt, kann entweder kein Beschichtungsmaterial mehr oder nur noch eine ungenügende Menge versprüht werden. Die Beschichtungsmaterialdüse muss dann gereinigt werden. Dazu wird der Abzug der Spritzpistole zum Beispiel mit einer Abzugsverriegelung arretiert, so dass kein Beschichtungsmaterial mehr aus der Spritzpistole austreten kann. Bei einer elektrostatischen Spritzpistole wird durch die Arretierung des Abzugs zusätzlich dafür gesorgt, dass keine Hochspannung mehr an der Hochspannungselektrode anliegt. Dann kann die Beschichtungsmaterialdüse ausgebaut werden. Anschliessend muss die verstopfte Beschichtungsmaterialdüse manuell, beispielsweise mit Lösungsmittel und einer feinen Reinigungsnadel gereinigt werden. Anschliessend muss die Beschichtungsmaterialdüse wieder in die Spritzpistole eingebaut werden. Nachdem die Abzugsverriegelung wieder gelöst ist, ist die Spritzpistole wieder betriebsbereit. Dieser Vorgang nimmt viel Zeit in Anspruch. Bei der manuellen Reinigung kann es vorkommen, dass die Beschichtungsmaterialdüse beschädigt wird und durch eine neue Düse ersetzt werden muss. Zudem kann es vorkommen, dass die verstopfte Beschichtungsmaterialdüse manuell nicht mehr gereinigt werden kann und dann ebenfalls ersetzt werden muss.When coating a workpiece with a coating material, such as a paint, a spray gun is often used which sprays the pressurized coating material through a coating material nozzle. In particular, if there are dirt particles in the coating material, it may happen that the coating material nozzle clogged. If the spray gun is still used, either no more coating material or only an insufficient amount can be sprayed. The coating material nozzle must then be cleaned. For this purpose, the trigger of the spray gun is locked, for example with a trigger lock, so that no coating material can escape from the spray gun. In an electrostatic spray gun is additionally ensured by the arrest of the trigger that no high voltage is applied to the high voltage electrode. Then the coating material nozzle can be removed. Subsequently, the clogged coating material nozzle must manually, for example with solvent and a fine cleaning needle getting cleaned. Subsequently, the coating material nozzle must be reinstalled in the spray gun. After the trigger lock is released again, the spray gun is ready for use again. This process takes a long time. During manual cleaning, the coating material nozzle may be damaged and replaced with a new nozzle. In addition, it can happen that the clogged coating material nozzle can not be cleaned manually and then also has to be replaced.

Stand der TechnikState of the art

Bisher ist aus dem Stand der Technik keine befriedigende Lösung bekannt.So far, no satisfactory solution is known from the prior art.

Aus der Druckschrift US 5,820,025 ist eine Sprühpistole mit einer umkehrbaren Düsenhalterung bekannt. Die Düsenhalterung ist an beiden Enden jeweils mit einem Gewinde ausgestattet und kann dadurch auf zwei verschiedene Arten auf den Lauf der Sprühpistole geschraubt werden.From the publication US 5,820,025 is a spray gun with a reversible nozzle holder known. The nozzle holder is threaded at both ends, allowing it to be screwed onto the barrel of the spray gun in two different ways.

Darstellung der ErfindungPresentation of the invention

Eine Aufgabe der Erfindung ist es, eine umkehrbare Beschichtungsmaterialdüse für eine Spritzpistole zum Beschichten von Werkstücken mit Beschichtungsmaterial anzugeben, die so gestaltet ist, dass sie sowohl zur Beschichtung eines Werkstücks dienen kann als auch bei Bedarf selbstreinigend ist.An object of the invention is to provide a reversible coating material nozzle for a spray gun for coating workpieces with coating material which is designed so that it can both serve for coating a workpiece and is also self-cleaning if required.

Eine weitere Aufgabe der Erfindung ist es, die Beschichtungsmaterialdüse trotz ihrer kleinen Abmessungen ohne zusätzliches Werkzeug, also lediglich mit der Hand, aus dem Spritzpistolenkopf ausbauen und in den Spritzpistolenkopf einbauen zu können.A further object of the invention is to be able to remove the coating material nozzle, despite its small dimensions, without additional tools, ie only by hand, from the spray gun head and to be able to install it in the spray gun head.

Vorteilhafter Weise ist die Beschichtungsmaterialdüse einfach aus der Spritzpistole entfernbar und zentriert sich beim Einbau automatisch selbst.Advantageously, the coating material nozzle is easily removable from the spray gun and automatically centered during installation itself.

Die Aufgabe wird durch eine umkehrbare Beschichtungsmaterialdüse für eine Spritzpistole zum Beschichten von Werkstücken mit Beschichtungsmaterial mit den in Patentanspruch 1 angegebenen Merkmalen gelöst.The object is achieved by a reversible coating material nozzle for a spray gun for coating workpieces with coating material having the features specified in claim 1.

Die erfindungsgemässe umkehrbare Beschichtungsmaterialdüse für eine Spritzpistole zum Beschichten eines Werkstücks mit Beschichtungsmaterial ist so ausgestaltet, dass sie in einer ersten und einer zweiten Einbaulage in eine Düsenaufnahme der Spritzpistole einbaubar ist. Sie umfasst einen Düsenkern mit einer Düsenkernöffnung und einen mit dem Düsenkern formschlüssig verbundenen Düsennippel mit einer Düsennippelöffnung. Zudem ist ein Düsenkanal für das Beschichtungsmaterial vorgesehen, der durch den Düsennippel und den Düsenkern reicht und die Düsennippelöffnung mit der Düsenkernöffnung verbindet. Der Düsennippel weist einen zylindrischen Abschnitt auf, der in der ersten Einbaulage mit der Düsenaufnahme der Spritzpistole einen Formschluss bildet. Darüber hinaus ist ein axialer Anschlag vorgesehen. Das Verhältnis zwischen der Länge vom Anschlag bis zum zylindrischen Abschnitt und dem Düsendurchmesser liegt im Bereich zwischen 0,75 und 2,00.The inventive reversible coating material nozzle for a spray gun for coating a workpiece with coating material is designed so that it can be installed in a first and a second mounting position in a nozzle holder of the spray gun. It comprises a nozzle core with a nozzle core opening and a nozzle nipple with a nozzle nipple opening that is positively connected to the nozzle core. In addition, a nozzle channel for the coating material is provided which extends through the nozzle nipple and the nozzle core and connects the nozzle nipple opening with the nozzle core opening. The nozzle nipple has a cylindrical portion which forms a positive connection in the first mounting position with the nozzle holder of the spray gun. In addition, an axial stop is provided. The ratio between the length from the stop to the cylindrical portion and the nozzle diameter is in the range between 0.75 and 2.00.

Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den in den abhängigen Patentansprüchen angegebenen Merkmalen.Advantageous developments of the invention will become apparent from the features indicated in the dependent claims.

Bei einer Ausführungsform der erfindungsgemässen Beschichtungsmaterialdüse liegt das Verhältnis zwischen der Länge und dem Düsendurchmesser im Bereich zwischen 0,80 und 1,35.In one embodiment of the coating material nozzle according to the invention, the ratio between the length and the nozzle diameter is in the range between 0.80 and 1.35.

Bei einer weiteren Ausführungsform der erfindungsgemässen Beschichtungsmaterialdüse weist der Düsennippel einen Konus auf, der in der ersten Einbaulage mit der Düsenaufnahme der Spritzpistole einen Formschluss bildet. Der Düsenkern weist ebenfalls einen Konus auf, der in der zweiten Einbaulage mit der Düsenaufnahme einen Formschluss bildet.In a further embodiment of the coating material nozzle according to the invention, the nozzle nipple has a cone which, in the first installation position, forms a positive connection with the nozzle receptacle of the spray gun. The nozzle core also has a cone, which forms a positive connection in the second mounting position with the nozzle holder.

Bei einer Weiterbildung der erfindungsgemässen Beschichtungsmaterialdüse ist der Düsennippel aus Kunststoff. Dies hat den Vorteil, dass der Düsennippel aus einem preiswerten Material und im Spritzgussverfahren hergestellt werden kann.In a further development of the coating material nozzle according to the invention, the nozzle nipple is made of plastic. This has the advantage that the nozzle nipple can be manufactured from a low-cost material and by injection molding.

Bei einer anderen Weiterbildung der erfindungsgemässen Beschichtungsmaterialdüse ist der Düsenkern aus Hartmetall oder Keramik. Damit wird die Standzeit der Düse verlängert. Zudem kann bei dieser Weiterbildung auch abrasives Beschichtungsmaterial verspritzt werden.In another development of the coating material nozzle according to the invention, the nozzle core is made of hard metal or ceramic. This extends the service life of the nozzle. In addition, in this development also abrasive coating material can be sprayed.

Bei einer zusätzlichen Weiterbildung der erfindungsgemässen Beschichtungsmaterialdüse weist der Düsennippel einen weiteren zylindrischen Abschnitt auf, der mit dem Düsenkern einen Formschluss bildet. Toleranzen bei der Herstellung dieses Abschnitts spielen keine besondere Rolle. Auch eine eventuell auftretende Materialverpressung ist unkritisch oder sogar für die Dichtheit förderlich.In an additional development of the coating material nozzle according to the invention, the nozzle nipple has a further cylindrical section which forms a positive connection with the nozzle core. Tolerances in the production of this section do not play a special role. Even a possible material compression is uncritical or even conducive to the tightness.

Bei einer Ausführungsform der erfindungsgemässen Beschichtungsmaterialdüse ist eine Dichtung zwischen dem Düsenkern und dem Düsennippel vorgesehen. Dadurch kann die Dichtheit zwischen dem Düsennippel und dem Düsenkern erhöht und erreicht werden, dass das Beschichtungsmaterial ausschliesslich durch die Düsenkernöffnung aus der Beschichtungsmaterialdüse austritt.In one embodiment of the coating material nozzle according to the invention, a seal is provided between the nozzle core and the nozzle nipple. Thereby, the tightness between the nozzle nipple and the nozzle core can be increased and achieved that the coating material exits exclusively through the nozzle core opening from the coating material nozzle.

Bei einer weiteren Ausführungsform der erfindungsgemässen Beschichtungsmaterialdüse ist eine Düsenfassung vorgesehen, welche den Düsenkern und den Düsennippel zusammenhält. Bei dieser Ausführungsform kann auch der Düsennippel aus Hartmetall oder Keramik hergestellt sein. Damit lässt sich die Standzeit der Beschichtungsmaterialdüse weiter erhöhen.In a further embodiment of the coating material nozzle according to the invention, a nozzle holder is provided which holds together the nozzle core and the nozzle nipple. In this embodiment, the nozzle nipple may be made of hard metal or ceramic. This can further increase the service life of the coating material nozzle.

Bei einer weiteren Ausführungsform der erfindungsgemässen Beschichtungsmaterialdüse ist die Düsenfassung aus Kunststoff. Eine solche Beschichtungsmaterialdüse ist kostengünstig im Spritzgussverfahren herstellbar.In a further embodiment of the coating material nozzle according to the invention, the nozzle holder is made of plastic. Such a coating material nozzle can be inexpensively produced by injection molding.

Zudem wird vorgeschlagen, bei der erfindungsgemässen Beschichtungsmaterialdüse die Verbindung zwischen der Düsenfassung und dem Düsennippel als Schnappverbindung auszubilden. Dies erleichtert ebenfalls die Herstellung. Die Düsenfassung und der Düsennippel können aber durch Kleben, Schweissen oder durch einen Pressvorgang miteinander verbunden werden.In addition, it is proposed to form the connection between the nozzle holder and the nozzle nipple in the inventive coating material nozzle as a snap connection. This also facilitates the production. However, the nozzle holder and the nozzle nipple can be connected to each other by gluing, welding or by a pressing operation.

Bei der erfindungsgemässen Beschichtungsmaterialdüse kann der Kunststoff elektrisch nichtleitend ausgebildet sein. Eine solche Beschichtungsmaterialdüse kann in einer elektrostatischen Spritzpistole eingesetzt werden. Durch den nichtleitenden Kunststoff wird erreicht, dass die elektrische Ladung der hochspannungsführenden Elektrode am Spritzpistolenkopf nicht auf das Gehäuse der Spritzpistole gelangt. Zudem wird damit erreicht, dass es zu keiner unzulässigen Erhöhung der Kapazität gegenüber dem Erdpotenzial kommt. Eine schlagartige Entladung wird verhindert. Bei einer Elektrostatik-Spritzpistole hat dies zudem den Vorteil, dass durch den geringeren Anteil an Metall die elektrische Kapazität der Beschichtungsdüse verkleinert wird. Dadurch kann nicht mehr so viel elektrische Ladung gespeichert werden, die Gefahr einer plötzlichen Entladung wird verringert.In the case of the coating material nozzle according to the invention, the plastic can be designed to be electrically non-conductive. Such a coating material nozzle can be used in an electrostatic spray gun. By the non-conductive plastic is achieved so that the electrical charge of the high-voltage electrode on the spray gun head does not reach the housing of the spray gun. It also ensures that there is no undue increase in capacity compared to the earth potential. A sudden discharge is prevented. In the case of an electrostatic spray gun, this also has the advantage that the smaller capacity of metal reduces the electrical capacitance of the coating nozzle. As a result, not so much electrical charge can be stored, the risk of sudden discharge is reduced.

Bei einer zusätzlichen Ausführungsform der erfindungsgemässen Beschichtungsmaterialdüse ist eine Schulter vorgesehen, die einen Durchmesser von wenigstens 5 mm und maximal 15 mm aufweist und einen axialen Anschlag bildet.In an additional embodiment of the coating material nozzle according to the invention, a shoulder is provided which has a diameter of at least 5 mm and a maximum of 15 mm and forms an axial stop.

Vorteilhafterweise ist bei der erfindungsgemässen Beschichtungsmaterialdüse der Düsennippel ein Spritzgussteil, das den Düsenkern teilweise umschliesst. Auch diese Ausführungsform ist kostengünstig und einfach herstellbar.Advantageously, in the case of the coating material nozzle according to the invention, the nozzle nipple is an injection-molded part which partially encloses the nozzle core. This embodiment is inexpensive and easy to produce.

Darüber hinaus kann bei der erfindungsgemässen Beschichtungsmaterialdüse die Schulter derart ausgebildet sein, dass sie mit einer Luftkappe der Spritzpistole im eingebauten Zustand einen Formschluss bildet. Wird die Luftkappe um ihre Längsachse gedreht, dreht sich die Beschichtungsmaterialdüse mit. Dies ist insbesondere von Vorteil, wenn die Düsenkernöffnung schlitzförmig ausgebildet ist. Auf diese Weise kann der von der Beschichtungsmaterialdüse erzeugte Flachstrahl gedreht und an die jeweiligen Bedürfnisse bei der Beschichtung angepasst werden.Moreover, in the case of the coating material nozzle according to the invention, the shoulder can be designed such that it forms a positive connection with an air cap of the spray gun in the installed state. If the air cap is rotated about its longitudinal axis, the coating material nozzle rotates. This is particularly advantageous when the nozzle core opening is slit-shaped. In this way, the flat jet generated by the coating material nozzle can be rotated and attached to the be adapted to the particular needs of the coating.

Bei einer weiteren Ausführungsform der erfindungsgemässen Beschichtungsmaterialdüse weist die Mantelfläche der Schulter eine ebene Fläche auf. Bei der Montage der Beschichtungsmaterialdüse wird die ebene Fläche der Schulter mit der ebenen Fläche der Luftkappe zur Deckung gebracht.In a further embodiment of the coating material nozzle according to the invention, the lateral surface of the shoulder has a flat surface. During assembly of the coating material nozzle, the flat surface of the shoulder is brought into registry with the flat surface of the air cap.

Die erfindungsgemässe Spritzpistole zum Beschichten eines Werkstücks mit Beschichtungsmaterial weist eine Beschichtungsmaterialdüse auf, die wie oben beschrieben, ausgebildet ist.The spray gun according to the invention for coating a workpiece with coating material has a coating material nozzle which is designed as described above.

Es kann vorgesehen sein, dass bei der erfindungsgemässen Spritzpistole die Düsenaufnahme eine Bohrung zur Aufnahme des Düsennippels aufweist.It can be provided that in the spray gun according to the invention, the nozzle receptacle has a bore for receiving the nozzle nipple.

Zudem kann vorgesehen sein, dass die Spritzpistole eine Hochspannungselektrode aufweist.In addition, it can be provided that the spray gun has a high voltage electrode.

Die erfindungsgemässe Beschichtungsmaterialdüse kann in einer Spritzpistole zum Beschichten eines Werkstücks mit Beschichtungsmaterial verwendet werden.The coating material nozzle according to the invention can be used in a spray gun for coating a workpiece with coating material.

Schliesslich wird ein Verfahren zum Betreiben der oben beschriebenen Spritzpistole zum Beschichten eines Werkstücks mit Beschichtungsmaterial vorgeschlagen, bei dem die Beschichtungsmaterialdüse in der ersten Einbaulage in die Spritzpistole eingebaut wird, wenn die Spritzpistole im Beschichtungsbetrieb arbeiten soll. Wenn die Spritzpistole im Reinigungsbetrieb arbeiten soll, wird die Beschichtungsmaterialdüse in der zweiten Einbaulage in die Spritzpistole eingebaut.Finally, a method for operating the spray gun described above for coating a workpiece with coating material is proposed in which the coating material nozzle is installed in the first installation position in the spray gun when the spray gun is to operate in the coating operation. When the spray gun is to operate in the cleaning mode, the coating material nozzle becomes installed in the second installation position in the spray gun.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Im Folgenden wird die Erfindung mit mehreren Ausführungsbeispielen anhand von sechs Figuren weiter erläutert.

Figur 1
zeigt eine Ausführungsform der erfindungsgemässen Spritzpistole mit einer ersten Ausführungsform der erfindungsgemässen umkehrbaren Beschichtungsmaterialdüse in der Seitenansicht.
Figur 2
zeigt den Sprühkopf der Spritzpistole aus Figur 1 mit der Beschichtungsmaterialdüse in einer ersten Einbaulage in einer vergrösserten Ansicht teilweise im Schnitt.
Figur 3
zeigt einen Ausschnitt des Sprühkopfs mit der Beschichtungsmaterialdüse in der ersten Einbaulage in einer nochmals vergrösserten Ansicht.
Figur 4
zeigt den Sprühkopf der Spritzpistole aus Figur 1 mit der Beschichtungsmaterialdüse in einer zweiten Einbaulage in einer vergrösserten Ansicht teilweise im Schnitt.
Figur 5a
zeigt die erste Ausführungsform der Beschichtungsmaterialdüse in der Seitenansicht.
Figur 5b
zeigt die erste Ausführungsform der Beschichtungsmaterialdüse im Querschnitt von der Seite.
Figur 5c
zeigt die erste Ausführungsform der Beschichtungsmaterialdüse in der Draufsicht.
Figur 5d
zeigt die erste Ausführungsform der Beschichtungsmaterialdüse im Querschnitt von oben.
Figur 5e
zeigt die erste Ausführungsform der Beschichtungsmaterialdüse in der Ansicht von vorne.
Figur 5f
zeigt die erste Ausführungsform der Beschichtungsmaterialdüse in einer Explosionsansicht.
Figur 6a
zeigt eine zweite Ausführungsform der Beschichtungsmaterialdüse in der Seitenansicht.
Figur 6b
zeigt die zweite Ausführungsform der Beschichtungsmaterialdüse im Querschnitt von der Seite.
Figur 6c
zeigt die zweite Ausführungsform der Beschichtungsmaterialdüse in der Draufsicht.
Figur 6d
zeigt die zweite Ausführungsform der Beschichtungsmaterialdüse im Querschnitt von oben.
Figur 6e
zeigt die zweite Ausführungsform der Beschichtungsmaterialdüse in der Ansicht von vorne.
In the following the invention will be explained with several embodiments with reference to six figures.
FIG. 1
shows an embodiment of the inventive spray gun with a first embodiment of the inventive reversible coating material nozzle in the side view.
FIG. 2
shows the spray head of the spray gun FIG. 1 with the coating material nozzle in a first installation position in an enlarged view partially in section.
FIG. 3
shows a section of the spray head with the coating material nozzle in the first installation position in a further enlarged view.
FIG. 4
shows the spray head of the spray gun FIG. 1 with the coating material nozzle in a second installation position in an enlarged view partially in section.
FIG. 5a
shows the first embodiment of the coating material nozzle in the side view.
FIG. 5b
shows the first embodiment of the coating material nozzle in cross-section from the side.
FIG. 5c
shows the first embodiment of the coating material nozzle in plan view.
FIG. 5d
shows the first embodiment of the coating material nozzle in cross-section from above.
FIG. 5e
shows the first embodiment of the coating material nozzle in the front view.
FIG. 5f
shows the first embodiment of the coating material nozzle in an exploded view.
FIG. 6a
shows a second embodiment of the coating material nozzle in the side view.
FIG. 6b
shows the second embodiment of the coating material nozzle in cross-section from the side.
FIG. 6c
shows the second embodiment of the coating material nozzle in plan view.
FIG. 6d
shows the second embodiment of the coating material nozzle in cross section from above.
FIG. 6e
shows the second embodiment of the coating material nozzle in the front view.

Wege zur Ausführung der ErfindungWays to carry out the invention

Figur 1 zeigt eine Ausführungsform der erfindungsgemässen Spritzpistole 1 mit einer ersten Ausführungsform der erfindungsgemässen umkehrbaren Beschichtungsmaterialdüse 20 in der Seitenansicht. Die Beschichtungsmaterialdüse 20 wird im Folgenden der Einfachheit halber auch nur als Düse bezeichnet. Die Spritzpistole 1 umfasst ein Pistolengehäuse 14, welches im Folgenden auch als Gehäuse der Spritzpistole bezeichnet wird. Am vorderen Ende der Spritzpistole 1 befindet sich ein Spritzpistolenkopf 6. Ein Teil davon ist in Figur 1 im Schnitt dargestellt. Der Spritzpistolenkopf 6 wird mit einer Überwurfmutter 7 auf das Pistolengehäuse 14 geschraubt. Im Inneren des Spritzpistolenkopfs 6 befindet sich eine Beschichtungsmaterialdüse 20, welche in den Figuren 1, 2 und 3 in einer ersten Einbaulage dargestellt ist. Die Beschichtungsmaterialdüse 20 wird mit der Überwurfmutter 7 im Spritzpistolenkopf 6 gehalten. FIG. 1 shows an embodiment of the inventive spray gun 1 with a first embodiment of the inventive reversible coating material nozzle 20 in side view. The coating material nozzle 20 will hereinafter be referred to simply as a nozzle for the sake of simplicity. The spray gun 1 comprises a gun housing 14, which is also referred to below as the housing of the spray gun. At the front end of the spray gun 1 is a spray gun head 6. A part of it is in FIG. 1 shown in section. The spray gun head 6 is screwed with a union nut 7 on the gun housing 14. Inside the spray gun head 6 is a coating material nozzle 20, which in the FIGS. 1, 2 and 3 is shown in a first mounting position. The coating material nozzle 20 is held with the union nut 7 in the spray gun head 6.

Zudem umfasst der Spritzpistolenkopf 6 einen Düsenschutz 8, der jedoch optional ist. Durch ihn wird das Risiko verringert, dass das Personal unmittelbar am Düsenauslass 24 der Beschichtungsmaterialdüse 20 (siehe Figur 3) mit dem Beschichtungsmaterial in Berührung kommt. Ein Kontakt mit dem Beschichtungsmaterial ist besonders dort zu vermeiden, weil das Beschichtungsmaterial dort aufgrund des hohen Drucks zu Verletzungen führen kann, und wenn es unmittelbar mit der Haut in Berührung kommt, in die Haut eindringen kann. Durch den Düsenschutz 8 wird also die Gefahr reduziert, dass das Beschichtungsmaterial in die Haut eindringen kann, und eine mögliche schädigende Wirkung wird minimiert. Der Düsenschutz 8 wird im Folgenden auch als Berührungsschutz bezeichnet und umfasst mehrere Abstandshalter 8.1 und 8.2. Bei der in Figur 1 gezeigten Ausführungsform weist der Berührungsschutz 8 vier Abstandshalter auf, wobei aufgrund der Schnittdarstellung lediglich zwei zu sehen sind. Der Berührungsschutz kann auch mit lediglich zwei oder drei Abstandshaltern ausgestattet sein. Zudem ist es möglich, fünf oder mehr Abstandshalter vorzusehen.In addition, the spray gun head 6 includes a nozzle guard 8, which is optional. It reduces the risk that the personnel will be immediately at the nozzle outlet 24 of the coating material nozzle 20 (see FIG. 3 ) comes into contact with the coating material. Contact with the coating material is to be avoided especially there, because the coating material there may cause injuries due to the high pressure, and when it comes into direct contact with the skin, can penetrate into the skin. The nozzle guard 8 thus reduces the risk that the coating material can penetrate into the skin, and a possible damaging effect is minimized. The nozzle guard 8 is also referred to below as contact protection and comprises a plurality of spacers 8.1 and 8.2. At the in FIG. 1 shown embodiment, the contact protection 8 four spacers, wherein due to the sectional view only two can be seen. The contact protection can also be equipped with only two or three spacers. In addition, it is possible to provide five or more spacers.

Die Versorgung der Beschichtungsmaterialdüse 20 erfolgt über eine Materialleitung 13. Diese wiederum ist über einen Anschluss für Beschichtungsmaterial 3 mit einem Materialschlauch (in den Figuren nicht gezeigt) verbindbar.The supply of the coating material nozzle 20 via a material line 13. This in turn is connected via a connection for coating material 3 with a material hose (not shown in the figures) connectable.

Die Spritzpistole 1 weist des Weiteren einen Anschluss für Druckluft 4 auf. Die Druckluft kann bei Bedarf durch Formluftkanäle 11 und 12, welche sich im stromabwärtigen Bereich in einer Luftkappe 10 des Spritzkopfs 8 befinden, auf den Beschichtungsmaterialstrahl gerichtet werden. Mit Hilfe der Druckluft kann die Form des Beschichtungsmaterialstrahls angepasst werden.The spray gun 1 further has a connection for compressed air 4. The compressed air can be directed to the coating material jet as required by forming air channels 11 and 12, which are located in the downstream area in an air cap 10 of the spray head 8. With the help of compressed air, the shape of the coating material beam can be adjusted.

Des Weiteren umfasst die Spritzpistole 1 einen Elektroanschluss 5, über den eine Elektrode 15 am Spritzpistolenkopf 6 mit Hochspannung versorgt werden kann. Die Hochspannung dient zur Ionisierung des Beschichtungsmaterials. Eine derart ausgebildete Spritzpistole wird im Folgenden auch als Elektrostatikpistole bezeichnet.Furthermore, the spray gun 1 comprises an electrical connection 5, via which an electrode 15 on the spray gun head 6 can be supplied with high voltage. The high voltage serves to ionize the coating material. A spray gun designed in this way is also referred to below as an electrostatic gun.

Um den Beschichtungsmaterialfluss zu steuern, umfasst die Spritzpistole 1 auch einen Abzugsbügel 2. Bei dessen Betätigung wird ein in der Spritzpistole 1 angeordnetes Ventil über eine Ventilstange geöffnet, so dass das Beschichtungsmaterial zur Beschichtungsmaterialdüse 20 gelangt und durch sie verspritzt wird. Mit Hilfe einer Abzugsverriegelung 16 kann der Abzugsbügel 2 arretiert werden. Im arretierten Zustand kann der Abzugsbügel 2 nicht mehr betätigt werden, so dass kein Beschichtungsmaterial mehr verspritzt werden kann.In order to control the flow of coating material, the spray gun 1 also comprises a trigger guard 2. When actuated, a valve arranged in the spray gun 1 is opened via a valve rod, so that the coating material reaches the coating material nozzle 20 and is sprayed through it. With the help of a trigger lock 16 of the trigger guard 2 can be locked. In the locked state, the trigger guard 2 can not be operated more so that no coating material can be sprayed.

Figur 2 zeigt den Sprühkopf 6 der Spritzpistole 1 aus Figur 1 mit der Beschichtungsmaterialdüse 20 in einer ersten Einbaulage in einer vergrösserten Ansicht teilweise im Schnitt. Figur 3 zeigt einen Ausschnitt des Sprühkopfs 6 mit der Beschichtungsmaterialdüse 20 in der ersten Einbaulage in einer noch stärker vergrösserten Ansicht. Befindet sich die Beschichtungsmaterialdüse 20 in der ersten Einbaulage, wie dies in den Figuren 1, 2 und 3 gezeigt ist, arbeitet die Spritzpistole 1 im Beschichtungsbetrieb oder Beschichtungsmodus. Mit der Spritzpistole 1 können nun Werkstücke mit Beschichtungsmaterial beschichtet werden. In der ersten Einbaulage steckt der zylinderförmige Abschnitt 22.4 des Düsennippels 22 in einer Düsenaufnahme 9, die dazu eine entsprechend grosse Bohrung 9.4 aufweist. Der zylinderförmige Abschnitt 22.4 bildet zusammen mit der Bohrung 9.4 einen Formschluss. Wenn das unter Druck stehende Beschichtungsmaterial durch den Materialkanal 9.2 strömt, drückt es den zylindrischen Abschnitt 22.4 gegen die Wand der Bohrung 9.4 und sorgt so für eine verbesserte Abdichtung am Übergang zwischen dem Materialkanal 9.2 und dem Düsennippel 22. Auch wenn die Beschichtungsmaterialdüse 20 häufig ausgebaut und wieder eingesetzt wird, bleibt die Dichtwirkung unverändert erhalten. Wenn im Folgenden von zylinderförmig oder zylindrisch gesprochen wird, so soll damit auch eine leicht konische Form eingeschlossen sein. Leicht konisch bedeutet in diesem Zusammenhang, dass der Winkel zwischen der Längsachse und dem Konus zwischen 0 und 5° liegt. Das heisst, die Abweichung gegenüber einer exakt mathematischen zylindrischen Form soll also 5° nicht überschreiten. Der Düsennippel 22 weist zudem einen Konus 22.1 auf, der mit einer ebenfalls schrägen Fläche 9.1 der Düsenaufnahme 9 einen weiteren Formschluss bildet. Die schräge Fläche 9.1 hilft den Düsennippel 22.4 in die Bohrung 9.4 der Düsenaufnahme 9 einzuführen. Am stromabwärtigen Ende der Beschichtungsmaterialdüse 20 befindet sich ein Düsenkern 23. Das Beschichtungsmaterial wird, wenn der Abzugshebel 2 betätigt wird, durch die Bohrung 9.2 (welche auch als Beschichtungsmaterialkanal dient) und den Beschichtungsmaterialkanal 26 zur Düsenkernöffnung 24 transportiert und dort verspritzt. FIG. 2 shows the spray head 6 of the spray gun 1 from FIG. 1 with the coating material nozzle 20 in a first installation position in an enlarged view partially in section. FIG. 3 shows a section of the spray head 6 with the coating material nozzle 20 in the first installation position in an even more enlarged view. Is the coating material nozzle 20 in the first installation position, as in the FIGS. 1, 2 and 3 is shown, the spray gun 1 operates in the coating mode or coating mode. With the spray gun 1 now workpieces can be coated with coating material. In the first installation position of the cylindrical portion 22.4 of the nozzle nipple 22 is inserted in a nozzle holder 9, which has a correspondingly large bore 9.4. The cylindrical portion 22.4 forms a positive connection together with the bore 9.4. When the pressurized coating material flows through the material channel 9.2, it presses the cylindrical portion 22.4 against the wall of the bore 9.4 and thus ensures an improved seal at the transition between the material channel 9.2 and the nozzle nipple 22. Although the coating material nozzle 20 often removed and is used again, the sealing effect remains unchanged. If in the following of cylindrical or cylindrical is spoken, as should also be a slightly conical shape enclosed. Slightly conical in this context means that the angle between the longitudinal axis and the cone is between 0 and 5 °. This means that the deviation from an exactly mathematical cylindrical shape should not exceed 5 °. The nozzle nipple 22 also has a cone 22.1, which forms a further positive connection with a likewise inclined surface 9.1 of the nozzle holder 9. The inclined surface 9.1 helps to introduce the nozzle nipple 22.4 in the bore 9.4 of the nozzle holder 9. At the downstream end of the coating material nozzle 20 is a nozzle core 23. The coating material is when the trigger lever 2 is actuated through the hole 9.2 (which also serves as coating material channel) and the coating material channel 26 to the nozzle core opening 24 and sprayed there.

Figur 4 zeigt den Sprühkopf 6 der Spritzpistole 1 aus Figur 1 mit der Beschichtungsmaterialdüse 20 in einer zweiten Einbaulage in einer vergrösserten Ansicht teilweise im Schnitt. In der zweiten Einbaulage ist die Beschichtungsmaterialdüse 20 um 180° gedreht in den Spritzkopf 6 eingebaut. Der Konus 23.1 des Düsenkerns 23 bildet nun zusammen mit der schrägen Fläche 9.1 der Düsenaufnahme 9 einen Formschluss. Am stromabwärtigen Ende des Spritzkopfs 6 befindet sich der Düsennippel 22. Dessen Öffnung 25 bildet nun den Materialauslass der Spritzpistole 1. Wird nun der Abzugshebel 2 der Spritzpistole 1 betätigt, strömt das Beschichtungsmaterial zuerst durch die Düsenkernöffnung 24 der Beschichtungsmaterialdüse 20 und nimmt Ablagerungen mit, die sich im Bereich der Düsenkernöffnung 24 befinden. Die Ablagerungen werden durch die Düsennippelöffnung 25 aus der Spritzpistole 1 herausgedrückt. Anschliessend ist die Beschichtungsmaterialdüse 20 gereinigt und kann wieder in die erste Einbaulage gebracht werden. Dazu wird die Überwurfmutter 7 vom Spritzpistolengehäuse 14 abgeschraubt, die Beschichtungsmaterialdüse 20 herausgenommen, um 180° gedreht und wieder in die Düsenaufnahme 9 gesteckt. Anschliessend wird die Überwurfmutter 7 auf das Spritzpistolengehäuse 14 geschraubt und die Spritzpistole 1 ist wieder einsatzbereit, um die nächsten Werkstücke zu beschichten. FIG. 4 shows the spray head 6 of the spray gun 1 from FIG. 1 with the coating material nozzle 20 in a second mounting position in an enlarged view partially in section. In the second installation position, the coating material nozzle 20 is rotated by 180 ° in the spray head 6 installed. The cone 23.1 of the nozzle core 23 now forms together with the inclined surface 9.1 of the nozzle holder 9 a positive connection. If now the trigger 2 of the spray gun 1 is actuated, the coating material first flows through the nozzle core opening 24 of the coating material nozzle 20 and takes deposits with, the are in the region of the nozzle core opening 24. The deposits are pushed out of the spray gun 1 through the nozzle nipple opening 25. Subsequently, the coating material nozzle 20 is cleaned and can be brought back into the first installation position. For this purpose, the union nut 7 is unscrewed from the spray gun housing 14, the coating material nozzle 20 taken out, rotated by 180 ° and back in the nozzle holder 9 inserted. Subsequently, the union nut 7 is screwed onto the spray gun housing 14 and the spray gun 1 is ready for use again to coat the next workpieces.

Figur 5a zeigt die erste Ausführungsform der Beschichtungsmaterialdüse 20 in der Seitenansicht und Figur 5c zeigt diese in der Draufsicht. Figur 5b zeigt die erste Ausführungsform der Beschichtungsmaterialdüse 20 im Querschnitt von der Seite und Figur 5d im Querschnitt von oben. Figur 5e zeigt die erste Ausführungsform der Beschichtungsmaterialdüse 20 in der Ansicht von vorne. FIG. 5a shows the first embodiment of the coating material nozzle 20 in the side view and FIG. 5c shows this in plan view. FIG. 5b shows the first embodiment of the coating material nozzle 20 in cross-section from the side and FIG. 5d in cross-section from above. FIG. 5e shows the first embodiment of the coating material nozzle 20 in the front view.

Die Düsenfassung 21 ist so ausgebildet, dass sie den Düsennippel 22 und den Düsenkern 23 zusammenhält. Die Verbindung der Düsenfassung 21 mit dem Düsennippel 22 kann als Schnappverbindung 21.3, 22.3 ausgebildet sein. Die Düsenfassung 21 weist dazu ein federndes Element oder einen Schnapper 21.3 auf, der in eine Nut 22.3 des Düsennippels 22 greift.The nozzle holder 21 is formed so that it holds the nozzle nipple 22 and the nozzle core 23 together. The connection of the nozzle holder 21 with the nozzle nipple 22 may be formed as a snap connection 21.3, 22.3. The nozzle holder 21 has for this purpose a resilient element or a snapper 21.3, which engages in a groove 22.3 of the nozzle nipple 22.

Die Düsenfassung 21 kann aus Kunststoff hergestellt sein. Eine solche Beschichtungsmaterialdüse 20 ist kostengünstig im Spritzgussverfahren herstellbar.The nozzle holder 21 may be made of plastic. Such a coating material nozzle 20 can be inexpensively produced by injection molding.

Der Kunststoff, aus dem die Düsenfassung 21 und/oder der Düsennippel 22 hergestellt sind, ist vorzugsweise ein elektrisch nichtleitender Kunststoff. Durch den nichtleitenden Kunststoff wird erreicht, dass die elektrische Ladung der hochspannungsführenden Elektrode 15 am Spritzpistolenkopf 6 nicht auf das Gehäuse 14 der Spritzpistole 1 gelangt. Zudem wird damit erreicht, dass es zu keiner unzulässigen Erhöhung der Kapazität gegenüber dem Erdpotenzial kommt. Eine schlagartige Entladung wird verhindert. Statt Kunststoff kann auch ein anders elektrisch nichtleitendes Material verwendet werden. Eine solche Beschichtungsmaterialdüse kann in einer elektrostatischen Spritzpistole eingesetzt werden.The plastic from which the nozzle holder 21 and / or the nozzle nipple 22 are made, is preferably an electrically non-conductive plastic. The non-conductive plastic ensures that the electrical charge of the high-voltage-carrying electrode 15 on the spray gun head 6 does not reach the housing 14 of the spray gun 1. It also ensures that there is no undue increase in capacity compared to the earth potential comes. A sudden discharge is prevented. Instead of plastic, a different electrically non-conductive material can be used. Such a coating material nozzle can be used in an electrostatic spray gun.

Wird die Beschichtungsmaterialdüse für nichtelektrostatische Anwendungen benutzt, kann der Kunststoff auch elektrisch leitend sein, oder es kann statt des Kunststoffs auch Metall verwendet werden. Eine solche Beschichtungsmaterialdüse kann in einer nichtelektrostatischen Spritzpistole eingesetzt werden. Diese Beschichtungsmaterialdüse kann auch in einer elektrostatischen Spritzpistole eingesetzt werden, wenn die Spritzpistole ohne Elektrostatik betrieben wird.If the coating material nozzle is used for non-electrostatic applications, the plastic may also be electrically conductive, or metal may be used instead of the plastic. Such a coating material nozzle can be used in a non-electrostatic spray gun. This coating material nozzle can also be used in an electrostatic spray gun when the spray gun is operated without electrostatics.

Die Düsenfassung 21 umfasst auch eine Schulter 21.5, die als axialer Anschlag dient. Sie erstreckt sich zwischen dem Absatz 21.8 und dem Absatz 21.7. Im Bereich der Schulter 21.5 hat die Beschichtungsmaterialdüse 20 vorzugsweise einen Aussendurchmesser D von wenigstens 5 mm und maximal 15 mm. In einer bevorzugten Ausführungsform beträgt der Aussendurchmesser D 11 mm. Die Schulter 21.5 ist in Bezug auf den Konus 23.1 des Düsenkerns 23 und den Konus 22.1 des Düsennippels 22 in axialer Richtung so positioniert, dass die Masse L1 und L2 etwa gleich gross sind. Das Mass L1 ist definiert als der Abstand zwischen dem Absatz 21.8 und dem Konus 23.1. Das Mass L2 ist definiert als der Abstand zwischen dem Absatz 21.7 und dem Konus 22.1. Damit wird die Einbaubarkeit der Beschichtungsmaterialdüse 20 sowohl in der ersten Einbaulage als auch in der zweiten Einbaulage verbessert.The nozzle holder 21 also includes a shoulder 21.5, which serves as an axial stop. It extends between paragraph 21.8 and paragraph 21.7. In the region of the shoulder 21.5, the coating material nozzle 20 preferably has an outer diameter D of at least 5 mm and a maximum of 15 mm. In a preferred embodiment, the outer diameter D is 11 mm. The shoulder 21.5 is positioned with respect to the cone 23.1 of the nozzle core 23 and the cone 22.1 of the nozzle nipple 22 in the axial direction so that the mass L1 and L2 are approximately equal. The dimension L1 is defined as the distance between the shoulder 21.8 and the cone 23.1. The dimension L2 is defined as the distance between the shoulder 21.7 and the cone 22.1. Thus, the ability to install the coating material nozzle 20 is improved both in the first installation position and in the second installation position.

In der ersten Einbaulage bildet der Absatz 21.7 an der Schulter 21.5 einen axialen Anschlag. Wird die Überwurfmutter 7 auf das Gehäuse 14 der Spritzpistole geschraubt, drückt die Überwurfmutter 7 über den axialen Anschlag 21.7 den Konus 22.1 der Beschichtungsmaterialdüse 20 auf die Düsenaufnahme 9.In the first installation position, the shoulder 21.7 forms an axial stop on the shoulder 21.5. If the union nut 7 is screwed onto the housing 14 of the spray gun, the union nut 7 presses the cone 22.1 of the coating material nozzle 20 onto the nozzle holder 9 via the axial stop 21.7.

In der zweiten Einbaulage bildet der andere Absatz 21.8 der Schulter 21.5 einen axialen Anschlag. Wird die Überwurfmutter 7 auf das Gehäuse 14 der Spritzpistole geschraubt, drückt die Überwurfmutter 7 über den axialen Anschlag 21.8 den Konus 23.1 des Düsenkerns 23 auf die Düsenaufnahme 9.In the second installation position, the other shoulder 21.8 of the shoulder 21.5 forms an axial stop. If the union nut 7 is screwed onto the housing 14 of the spray gun, the union nut 7 presses the cone 23.1 of the nozzle core 23 onto the nozzle receptacle 9 via the axial stop 21.8.

Der Beschichtungsmaterialkanal 26 reicht durch den Düsennippel 22 und den Düsenkern 23 hindurch und verbindet die Düsennippelöffnung 25 mit der Düsenkernöffnung 24.The coating material channel 26 passes through the nozzle nipple 22 and the nozzle core 23 and connects the nozzle nipple opening 25 with the nozzle core opening 24.

Um die Dichtheit zwischen dem Düsennippel 22 und dem Düsenkern 23 zu erhöhen, kann eine Dichtung (in den Figuren nicht gezeigt) zwischen dem Düsenkern 22 und dem Düsennippel 23 vorgesehen sein. Die Dichtung kann als Axialdichtung, beispielsweise als O―Ring ausgebildet sein.In order to increase the tightness between the nozzle nipple 22 and the nozzle core 23, a seal (not shown in the figures) may be provided between the nozzle core 22 and the nozzle nipple 23. The seal may be formed as an axial seal, for example as an O-ring.

Die Dichtung kann, wie in den Figuren 5b und 5d gezeigt, verbessert werden, indem der Düsennippel 22 einen zylindrischen Abschnitt 22.5 aufweist, der in den Düsenkern 23 hineinragt. Sobald das Beschichtungsmaterial durch den Düsenkanal 26 strömt, drückt es den Abschnitt 22.5 gegen die Kanalwand 23.2 des Düsenkerns 23 und sorgt so für eine verbesserte Abdichtung am Kanalübergang zwischen dem Düsennippel 22 und dem Düsenkern 23.The seal can, as in the FIGS. 5b and 5d can be improved by the nozzle nipple 22 has a cylindrical portion 22.5 which projects into the nozzle core 23. As soon as the coating material flows through the nozzle channel 26, it pushes the section 22.5 against the channel wall 23.2 of the nozzle core 23 and thus ensures an improved seal at the channel transition between the nozzle nipple 22 and the nozzle core 23.

Die Beschichtungsmaterialdüse 20 weist eine Länge L im Bereich von 10,0 mm bis 14,6 mm und vorzugsweise von 12,3 mm auf. Der Düsendurchmesser beträgt vorzugsweise 11 mm. Die Abmessungen der Beschichtungsmaterialdüse 20 sind relativ klein, man kann sie aber noch mit der Hand greifen.The coating material nozzle 20 has a length L in the range of 10.0 mm to 14.6 mm, and preferably 12.3 mm. The nozzle diameter is preferably 11 mm. The dimensions of the coating material nozzle 20 are relatively small, but you can still grab them by hand.

Aus diesen Massen ergibt sich ein Verhältnis zwischen der Länge L und dem Düsendurchmesser D von 0,91 bis 1,33. Ein Verhältnis von L/D im Bereich von 0,75 ≤ L/D ≤ 2 ist noch tolerierbar. Vorzugsweise werden die Länge L und der Düsendurchmesser D so aufeinander abgestimmt, dass das Verhältnis L/D 1,12 ist. Bei diesem Verhältnis von L/D ist die Beschichtungsmaterialdüse 20 optimal in den Spritzpistolenkopf 6 einbaubar. Liegt das Verhältnis L/D ausserhalb des oben angegebenen Bereichs, kann sich die Beschichtungsmaterialdüse 20 sowohl beim Ausbau als auch beim Einbau im Spritzpistolenkopf 6 verkanten, so dass der Einbau beziehungsweise Ausbau ohne zusätzliches Werkzeug wenn überhaupt, dann nur noch schwerlich möglich ist und relativ viel Zeit und Geduld benötigt.From these masses results in a ratio between the length L and the nozzle diameter D from 0.91 to 1.33. A ratio of L / D in the range of 0.75 ≦ L / D ≦ 2 is still tolerable. Preferably, the length L and the nozzle diameter D are coordinated so that the ratio L / D is 1.12. At this ratio of L / D, the coating material nozzle 20 can be optimally installed in the spray gun head 6. If the ratio L / D outside the range specified above, the coating material nozzle 20 can tilt both during removal and installation in the spray gun head 6, so that the installation or removal without additional tools if at all, then only with difficulty and relatively much Time and patience needed.

Figur 6a zeigt eine zweite Ausführungsform der Beschichtungsmaterialdüse 30 in der Seitenansicht und Figur 6c in der Draufsicht. Figur 6b zeigt die zweite Ausführungsform der Beschichtungsmaterialdüse 30 im Querschnitt von der Seite und Figur 6d im Querschnitt von oben. Figur 6e zeigt die zweite Ausführungsform der Beschichtungsmaterialdüse 30 in der Ansicht von vorne. Die zweite Ausführungsform der Beschichtungsmaterialdüse 30 unterscheidet sich von der ersten Ausführungsform im Wesentlichen dadurch, dass der Düsennippel 32 mit dem Düsenkern 33 nicht nur formschlüssig, sondern auch kraftschlüssig verbunden ist. Der Düsennippel 32 ist so geformt und ausgebildet, dass er zusätzlich auch die Funktion der Düsenfassung 21 übernimmt. FIG. 6a shows a second embodiment of the coating material nozzle 30 in side view and FIG. 6c in the plan view. FIG. 6b shows the second embodiment of the coating material nozzle 30 in cross-section from the side and FIG. 6d in cross-section from above. FIG. 6e shows the second embodiment of the coating material nozzle 30 in the front view. The second embodiment of the coating material nozzle 30 differs from the first embodiment essentially in that the nozzle nipple 32 is not only positively connected to the nozzle core 33, but also positively connected. The nozzle nipple 32 is shaped and formed, that he also takes over the function of the nozzle holder 21.

Der Düsennippel 32 umfasst eine Schulter 32.5, die als axialer Anschlag dient. Sie befindet sich etwa in der Mitte der Beschichtungsmaterialdüse 30 und reicht vom Absatz 32.8 bis zum Absatz 32.7. Im Bereich der Schulter 32.5 hat die Beschichtungsmaterialdüse 30 vorzugsweise einen Aussendurchmesser von wenigstens 5 mm und maximal 15 mm.The nozzle nipple 32 includes a shoulder 32.5, which serves as an axial stop. It is located approximately in the middle of the coating material nozzle 30 and extends from paragraph 32.8 to paragraph 32.7. In the region of the shoulder 32.5, the coating material nozzle 30 preferably has an outer diameter of at least 5 mm and a maximum of 15 mm.

In der ersten Einbaulage bildet der Absatz 32.7 an der Schulter 32.5 einen axialen Anschlag. Wird die Überwurfmutter 7 auf das Gehäuse 14 der Spritzpistole geschraubt, drückt die Überwurfmutter 7 über den axialen Anschlag 32.7 den Konus 32.1 der Beschichtungsmaterialdüse 30 auf die Düsenaufnahme 9.In the first installation position of paragraph 32.7 at the shoulder 32.5 forms an axial stop. If the union nut 7 is screwed onto the housing 14 of the spray gun, the union nut 7 presses the cone 32.1 of the coating material nozzle 30 onto the nozzle holder 9 via the axial stop 32.7.

In der zweiten Einbaulage bildet der andere Absatz 32.8 der Schulter 32.5 einen axialen Anschlag. Wird die Überwurfmutter 7 auf das Gehäuse 14 der Spritzpistole geschraubt, drückt die Überwurfmutter 7 über den axialen Anschlag 32.8 den Konus 33.1 des Düsenkerns 33 auf die Düsenaufnahme 9 (siehe auch Figur 4).In the second installation position, the other shoulder 32.8 of the shoulder 32.5 forms an axial stop. If the union nut 7 is screwed onto the housing 14 of the spray gun, the union nut 7 presses on the axial stop 32.8 the cone 33.1 of the nozzle core 33 on the nozzle holder 9 (see also FIG. 4 ).

Die Beschichtungsmaterialdüse 30 weist eine Länge L im Bereich von 7,3 mm bis 11,3 mm und vorzugsweise von 9,3 mm auf. Der Düsendurchmesser D beträgt vorzugsweise 9 mm. Auch die Abmessungen der Beschichtungsmaterialdüse 30 sind relativ klein, aber auch sie kann man noch mit der Hand greifen.The coating material nozzle 30 has a length L in the range of 7.3 mm to 11.3 mm, and preferably of 9.3 mm. The nozzle diameter D is preferably 9 mm. The dimensions of the coating material nozzle 30 are relatively small, but they can still be reached by hand.

Aus diesen Massen ergibt sich ein Verhältnis zwischen der Länge L und dem Düsendurchmesser D von 0,81 bis 1,26. Ein Verhältnis von L/D im Bereich von 0,75 ≤ L/D ≤ 2 ist noch tolerierbar. Vorzugsweise werden die Länge L und der Düsendurchmesser D so aufeinander abgestimmt, dass das Verhältnis L/D 1,03 ist. Bei diesem Verhältnis von L/D ist die Beschichtungsmaterialdüse 20 optimal in den Spritzpistolenkopf 6 einbaubar. Liegt das Verhältnis L/D ausserhalb des oben angegebenen Bereichs, kann sich die Beschichtungsmaterialdüse 30 - wie bereits erwähnt - sowohl beim Ausbau als auch beim Einbau im Spritzpistolenkopf 6 verkanten, so dass der Einbau beziehungsweise Ausbau ohne zusätzliches Werkzeug wenn überhaupt, dann nur noch schwerlich möglich ist und relativ viel Zeit und Geduld benötigt.From these masses results in a ratio between the length L and the nozzle diameter D from 0.81 to 1.26. A ratio of L / D in the range of 0.75 ≦ L / D ≦ 2 is still tolerable. Preferably, the length L and the nozzle diameter D are matched to each other such that the ratio L / D is 1.03. At this ratio of L / D, the coating material nozzle 20 can be optimally installed in the spray gun head 6. If the ratio L / D outside the range specified above, the coating material nozzle 30 - as already mentioned - tilt both during removal and installation in the spray gun head 6, so that the installation or removal without additional tools if anything, then only with difficulty is possible and requires a lot of time and patience.

Das Material, aus dem der Düsennippel 32 hergestellt ist, ist vorzugsweise elektrisch nichtleitend. Dadurch wird erreicht, dass die elektrische Ladung der hochspannungsführenden Elektrode 15 am Spritzpistolenkopf 6 nicht auf das Gehäuse 14 der Spritzpistole 1 gelangt. Zudem wird damit erreicht, dass es zu keiner unzulässigen Erhöhung der Kapazität gegenüber dem Erdpotenzial kommt. Eine schlagartige Entladung wird verhindert. Der Düsennippel 32 dient somit der elektrischen Isolation zwischen den hochspannungsführenden Komponenten und den in der Regel geerdeten Komponenten der Spritzpistole 1. Eine solche Beschichtungsmaterialdüse kann in einer elektrostatischen Spritzpistole eingesetzt werden.The material from which the nozzle nipple 32 is made is preferably electrically non-conductive. It is thereby achieved that the electrical charge of the high-voltage-carrying electrode 15 on the spray gun head 6 does not reach the housing 14 of the spray gun 1. It also ensures that there is no undue increase in capacity compared to the earth potential. A sudden discharge is prevented. The nozzle nipple 32 thus serves for the electrical insulation between the high-voltage-carrying components and the generally grounded components of the spray gun 1. Such a coating material nozzle can be used in an electrostatic spray gun.

Der Düsennippel 32 kann ein Spritzgussteil sein, das den Düsenkern 33 teilweise umschliesst. Auch diese Ausführungsform ist kostengünstig und einfach herstellbar.The nozzle nipple 32 may be an injection molded part that partially encloses the nozzle core 33. This embodiment is inexpensive and easy to produce.

Die Dichtheit zwischen dem Düsennippel 32 und dem Düsenkern 33 kann, wie in den Figuren 6b und 6d gezeigt, verbessert werden, indem der Düsennippel 32 einen zylindrischen Abschnitt 32.9 aufweist, der in den Düsenkern 33 hineinragt. Sobald das Beschichtungsmaterial durch den Düsenkanal 26 strömt, drückt es den Abschnitt 32.9 gegen die Kanalwand 33.2 des Düsenkerns 33 und sorgt so für eine verbesserte Abdichtung am Kanalübergang zwischen dem Düsennippel 32 und dem Düsenkern 33.The tightness between the nozzle nipple 32 and the nozzle core 33 can, as in the Figures 6b and 6d can be improved by the nozzle nipple 32 has a cylindrical portion 32.9 which projects into the nozzle core 33. As soon as the coating material flows through the nozzle channel 26, it presses the section 32.9 against the channel wall 33.2 of the nozzle core 33 and thus ensures an improved seal at the channel transition between the nozzle nipple 32 and the nozzle core 33.

Um die Dichtheit zwischen dem Düsennippel 32 und dem Düsenkern 33 zu erhöhen, kann eine Dichtung (in den Figuren 6a bis 6e nicht gezeigt) zwischen dem Düsennippel 32 und dem Düsenkern 33 vorgesehen sein. Die Dichtung kann als Axialdichtung, beispielsweise als O-Ring, ausgebildet sein.In order to increase the tightness between the nozzle nipple 32 and the nozzle core 33, a seal (in the FIGS. 6a to 6e not shown) may be provided between the nozzle nipple 32 and the nozzle core 33. The seal may be formed as an axial seal, for example as an O-ring.

Die zylindrischen Abschnitte 22.4, 22.5, 32.4 und 32.9 der Düsennippel 22 beziehungsweise 32 haben zusätzlich den Vorteil, dass sie nicht anfällig auf Toleranzen und Materialverpressung sind.The cylindrical sections 22.4, 22.5, 32.4 and 32.9 of the nozzle nipples 22 and 32 additionally have the advantage that they are not susceptible to tolerances and material compression.

Die Düsenkerne 23 und 33 können aus Hartmetall oder Keramik sein. Damit wird die Standzeit der Beschichtungsmaterialdüsen 20 und 30 verlängert. Zudem kann mit solchen Beschichtungsmaterialdüsen auch abrasives Beschichtungsmaterial verspritzt werden, ohne dass dies zu einem übermässigen Verschleiss führt.The nozzle cores 23 and 33 may be made of hard metal or ceramic. Thus, the life of the coating material nozzles 20 and 30 is extended. In addition, abrasive coating material can also be sprayed with such coating material nozzles without resulting in excessive wear.

Die Düsennippel 22 und 32 können auch aus Hartmetall oder Keramik hergestellt sein. Damit lassen sich die Standzeiten der Beschichtungsmaterialdüsen 20 und 30 noch weiter erhöhen.The nozzle nipples 22 and 32 may also be made of cemented carbide or ceramic. Thus, the life of the coating material nozzles 20 and 30 can be further increased.

Vorzugsweise sind die Winkel α, β und γ (siehe Figuren 3 5d) aufeinander abgestimmt. Der Winkel γ bezeichnet den Winkel zwischen der Längsachse 27 und der Schräge des Konus 9.1 (Innenkonus) der Düsenaufnahme 9. Der Winkel α bezeichnet den Winkel zwischen der Längsachse 27 und der Schräge des Konus 22.1 (Aussenkonus). Der Winkel β schliesslich bezeichnet den Winkel zwischen der Längsachse 27 und der Schräge des Konus 23.1 (Aussenkonus). Sind alle drei Winkel α, β und γ etwa gleich gross können die Konusse 22.1 und 9.1 beziehungsweise 23.1 und 9.1 als Anschlag und/oder als Dichtung benutzt werden. Das Gleiche gilt sinngemäss auch für die Beschichtungsmaterialdüse 30.Preferably, the angles α, β and γ (see Figures 3 5d ) matched. The angle γ denotes the angle between the longitudinal axis 27 and the slope of the cone 9.1 (inner cone) of the nozzle holder 9. The angle α denotes the angle between the longitudinal axis 27 and the slope of the cone 22.1 (outer cone). The angle β finally denotes the angle between the longitudinal axis 27 and the slope of the cone 23.1 (outer cone). If all three angles α, β and γ are approximately equal, the cones 22.1 and 9.1 or 23.1 and 9.1 can be used as a stop and / or as a seal. The same applies mutatis mutandis to the coating material nozzle 30th

Die Schulter 21.5 beziehungsweise 32.5 kann sowohl bei der Beschichtungsmaterialdüse 20 als auch bei der Beschichtungsmaterialdüse 30 derart ausgebildet sein, dass sie mit der Luftkappe 10 der Spritzpistole 1 einen Formschluss bildet. Wird die Luftkappe 10 um ihre Längsachse gedreht, dreht sich die Beschichtungsmaterialdüse 20 beziehungsweise 30 mit. Dies ist insbesondere von Vorteil, wenn die Düsenkernöffnung 24 schlitzförmig ausgebildet ist. Auf diese Weise kann der von der Beschichtungsmaterialdüse 20 beziehungsweise 30 erzeugte Flachstrahl gedreht und an die jeweiligen Bedürfnisse bei der Beschichtung angepasst werden. Dazu kann wie in den Figuren 5a - 5e und 6a - 6e gezeigt, die Mantelfläche der Schulter 21.5 beziehungsweise 32.5 eine ebene Fläche 21.6 beziehungsweise 32.6 aufweisen. Bei der Montage der Beschichtungsmaterialdüse 20 beziehungsweise 30 wird die ebene Fläche 21.6 beziehungsweise 32.6 der Schulter mit der der ebenen Fläche der Luftkappe 10 zur Deckung gebracht.The shoulder 21.5 or 32.5 can be formed in both the coating material nozzle 20 and the coating material nozzle 30 such that it forms a positive connection with the air cap 10 of the spray gun 1. When the air cap 10 is rotated about its longitudinal axis, the coating material nozzle 20 or 30 rotates with it. This is particularly advantageous when the nozzle core opening 24 is slit-shaped. In this way, the flat jet generated by the coating material nozzle 20 or 30 can be rotated and adapted to the particular needs of the coating. This can be like in the FIGS. 5a-5e and 6a - 6e shown the outer surface of the shoulder 21.5 and 32.5 have a flat surface 21.6 and 32.6, respectively. When mounting the coating material nozzle 20 or 30, the flat surface is brought 21.6 or 32.6 of the shoulder with the flat surface of the air cap 10 to cover.

Wird die Beschichtungsmaterialdüse 20 beziehungsweise 30 in der ersten Einbaulage in die Spritzpistole eingebaut, arbeitet die Spritzpistole 1 im Beschichtungsbetrieb, so dass Werkstücke beschichtet werden können. Wenn die Beschichtungsmaterialdüse 20 beziehungsweise 30 der Spritzpistole 1 hingegen gereinigt werden soll, wird die Beschichtungsmaterialdüse in der zweiten Einbaulage in die Spritzpistole 1 eingebaut.If the coating material nozzle 20 or 30 is installed in the first installation position in the spray gun, the spray gun 1 operates in the coating operation, so that workpieces can be coated. If, on the other hand, the coating material nozzle 20 or 30 of the spray gun 1 is to be cleaned, the coating material nozzle is installed in the spray gun 1 in the second installation position.

In einer weiteren Ausführungsform der Beschichtungsmaterialdüse kann vorgesehen sein, dass die beiden Winkel α und β der Konusse 22.1 und 23.1 der Beschichtungsmaterialdüse 20 beziehungsweise die beiden Winkel α und β der Konusse 32.1 und 33.1 der Beschichtungsmaterialdüse 30 etwa gleich gross sind.In a further embodiment of the coating material nozzle it can be provided that the two angles α and β of the cones 22.1 and 23.1 of the coating material nozzle 20 or the two angles α and β of the cones 32.1 and 33.1 of the coating material nozzle 30 are approximately equal.

Die erfindungsgemässe Beschichtungsmaterialdüse kann auch in einer Spritzpistole ohne Druckluftunterstützung verwendet werden. Bei einer solchen Spritzpistole fehlt der Druckluftanschluss 4.The inventive coating material nozzle can also be used in a spray gun without compressed air support. In such a spray gun, the compressed air connection 4 is missing.

Die erfindungsgemässe Beschichtungsmaterialdüse kann auch in einer Automatik-Spritzpistole eingesetzt werden. Unter einer Automatik-Spritzpistole wird eine Spritzpistole verstanden, die nicht von Hand gehalten wird, sondern beispielsweise an einem Roboter oder einer Linearführung befestigt oder fix installiert ist.The inventive coating material nozzle can also be used in an automatic spray gun. An automatic spray gun is understood to mean a spray gun which is not held by hand but is fastened or fixedly installed, for example, on a robot or a linear guide.

Die vorhergehende Beschreibung der Ausführungsbeispiele gemäss der vorliegenden Erfindung dient nur zu illustrativen Zwecken und nicht zum Zwecke der Beschränkung der Erfindung. Im Rahmen der Erfindung sind verschiedene Änderungen und Modifikationen möglich, ohne den Umfang der Erfindung sowie ihre Äquivalente zu verlassen. So sind beispielsweise die verschiedenen in den Figuren 5 und 6 gezeigten Beschichtungsmaterialdüsen auch in andere Spritzpistolen einbaubar. Zudem sind die einzelnen Komponenten auch auf eine andere als in den Figuren gezeigte Weise miteinander kombinierbar.The foregoing description of the embodiments according to the present invention is for illustrative purposes only, and not for the purpose of limiting the invention. Various changes and modifications are possible within the scope of the invention without departing from the scope of the invention and its equivalents. For example, the different in the Figures 5 and 6 shown coating material nozzles can also be installed in other spray guns. In addition, the individual components can also be combined with one another in a different way than shown in the figures.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Sprühpistolespray gun
22
Abzugsbügeltrigger guard
33
Anschluss für BeschichtungsmaterialConnection for coating material
44
Anschluss für DruckluftConnection for compressed air
55
ElektroanschlussElectrical connection
66
Pistolenkopfgun head
77
ÜberwurfmutterNut
88th
Düsenschutznozzle protection
8.18.1
Abstandshalterspacer
8.28.2
Abstandshalterspacer
99
Düsenaufnahmenozzle receiving
9.19.1
schräge Flächesloping surface
9.29.2
Bohrung/MaterialkanalHole / channel material
9.49.4
Bohrungdrilling
1010
Luftkappeair cap
1111
FormluftkanalForm air duct
1212
FormluftkanalForm air duct
1313
BeschichtungsmaterialleitungCoating material line
1414
Gehäuse der SpritzpistoleHousing of the spray gun
1515
Elektrodeelectrode
1616
Abzugsverriegelungtrigger lock
2020
Düsejet
2121
Düsenfassungnozzle fitting
21.321.3
Feder oder SchnapperSpring or snapper
21.521.5
Schultershoulder
21.621.6
ebene Flächeflat surface
21.721.7
axialer Anschlagaxial stop
21.821.8
axialer Anschlagaxial stop
2222
Düsennippelnozzle nipple
22.122.1
Konuscone
22.222.2
Bohrungdrilling
22.322.3
Nutgroove
22.422.4
zylinderförmiger Abschnittcylindrical section
22.522.5
zylinderförmiger Abschnittcylindrical section
2323
Düsenkernnozzle core
23.123.1
Konuscone
23.223.2
Bohrungdrilling
2424
DüsenkernöffnungNozzle core opening
2525
DüsennippelöffnungNozzle nipple opening
2626
Düsenkanalnozzle channel
2727
Längsachse oder x-AchseLongitudinal axis or x-axis
2828
y-Achsey-axis
3030
Düsejet
3232
Düsennippelnozzle nipple
32.132.1
Konuscone
32.232.2
Bohrungdrilling
32.432.4
zylinderförmiger Abschnittcylindrical section
32.532.5
Schultershoulder
32.632.6
ebene Flächeflat surface
32.732.7
axialer Anschlagaxial stop
32.832.8
axialer Anschlagaxial stop
32.932.9
zylinderförmiger Abschnittcylindrical section
3333
Düsenkernnozzle core
33.133.1
Konuscone
33.233.2
Bohrungdrilling
4040
Mittelliniecenter line
LL
Längelength
DD
Durchmesserdiameter
αα
Winkelangle
ββ
Winkelangle
γγ
Winkelangle

Claims (20)

  1. A reversible coating material nozzle for a spray gun for coating a workpiece with coating material,
    - which can be installed in a first and a second installation position in a nozzle seat (9) of the spray gun (1),
    - wherein a nozzle core (23; 33) with a nozzle core opening (24) is provided and a nozzle nipple (22; 32) connected in a form-fitting manner to the nozzle core (23; 33) and having a nozzle nipple opening (25) is provided,
    - wherein a nozzle channel (26) for the coating material is provided and reaches through the nozzle nipple (22; 32) and the nozzle core (23; 33) and connects the nozzle nipple opening (25) to the nozzle core opening (24),
    - wherein the nozzle nipple (22; 32) has a cylindrical portion (22.4; 32.4) which, in the first installation position, forms a form fit with the nozzle seat (9) of the spray gun (1),
    - wherein an axial stop (21.7; 32.7) is provided,
    - wherein the ratio between the length (L) from the stop (21.7; 32.7) to the cylindrical portion (22.4; 32.4) and the nozzle diameter (D) lies in the range between 0.75 and 2.00.
  2. The coating material nozzle according to patent claim 1,
    wherein the ratio of the length (L) to nozzle diameter (D) lies in the range between 0.80 and 1.35.
  3. The coating material nozzle according to patent claim 1 or 2,
    - wherein the nozzle nipple (22; 32) has a cone (22.1; 32.1) which, in the first installation position, forms a form fit with the nozzle seat (9) of the spray gun (1), and
    - wherein the nozzle core (23; 33) has a cone (23.1; 33.1) which, in the second installation position, forms a form fit with the nozzle seat (9).
  4. The coating material nozzle according to one of the preceding patent claims,
    wherein the nozzle nipple (22; 32) is made of plastic.
  5. The coating material nozzle according to patent claim 1, 2 or 3,
    wherein the nozzle core (23; 33) is made of hard metal or ceramic.
  6. The coating material nozzle according to one of the preceding patent claims,
    wherein the nozzle nipple (22; 32) has a further cylindrical portion (22.5; 32.9) which reaches into the nozzle core (23; 33).
  7. The coating material nozzle according to one of the preceding patent claims,
    wherein a seal is provided between the nozzle core (23; 33) and the nozzle nipple (22; 32).
  8. The coating material nozzle according to one of the preceding patent claims,
    wherein a nozzle mount (21) is provided which holds together the nozzle core (23) and the nozzle nipple (22).
  9. The coating material nozzle according to patent claim 8,
    wherein the nozzle mount (21) is made of plastic.
  10. The coating material nozzle according to patent claim 8 or 9,
    wherein the connection between the nozzle mount (21) and the nozzle nipple (22) is formed as a snap-fit connection (21.3, 22.3).
  11. The coating material nozzle according to one of patent claims 4 to 10,
    wherein the plastic is electrically non-conductive.
  12. The coating material nozzle according to one of patent claims 1 to 7,
    wherein the nozzle nipple (32) is an injection-moulded part which partly surrounds the nozzle core (33).
  13. The coating material nozzle according to one of the preceding patent claims,
    wherein a shoulder (21.5; 32.5) is provided which has a diameter of at least 5 mm and at most 15 mm and forms an axial stop (21.7; 32.7).
  14. The coating material nozzle according to patent claim 13,
    wherein the shoulder (21.5; 32.5) is formed in such a way that, in the installed state, it forms a form fit with an air cap (10) of the spray gun (1).
  15. The coating material nozzle according to one of preceding patent claims 12 or 13,
    wherein the lateral surface of the shoulder (21.5; 32.5) has a flat area (21.6; 32.6).
  16. A spray gun for coating a workpiece with coating material,
    wherein a coating material nozzle (20; 30) according to one of the preceding patent claims is provided.
  17. The spray gun according to patent claim 16,
    wherein the nozzle seat (9) has a bore (9.4) for receiving the nozzle nipple (22; 32).
  18. The spray gun according to patent claim 16 or 17,
    wherein a high-voltage electrode (15) is provided.
  19. Use of the coating material nozzle according to one of patent claims 16 to 18,
    in a spray gun (1) for coating a workpiece with coating material.
  20. A method for operating a spray gun for coating a workpiece with coating material according to one of the preceding patent claims,
    - wherein the coating material nozzle (20; 30) is installed in the spray gun (1) in the first installation position if the spray gun (1) is to operate in coating mode, and
    - wherein the coating material nozzle (20; 30) is installed in the spray gun (1) in the second installation position if the spray gun (1) is to operate in cleaning mode.
EP11405240.0A 2011-04-04 2011-04-04 Reversible coating material nozzle for a spray gun for coating a workpiece with coating material Active EP2508267B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP11405240.0A EP2508267B1 (en) 2011-04-04 2011-04-04 Reversible coating material nozzle for a spray gun for coating a workpiece with coating material
ES11405240.0T ES2498920T3 (en) 2011-04-04 2011-04-04 Spray nozzle of reversible coating material for a spray gun, to coat a workpiece with a coating material
PL11405240T PL2508267T3 (en) 2011-04-04 2011-04-04 Reversible coating material nozzle for a spray gun for coating a workpiece with coating material
US14/009,355 US9433953B2 (en) 2011-04-04 2012-04-03 Reversible coating material nozzle for a spray gun for coating a workpiece with coating material
PCT/CH2012/000078 WO2012135966A1 (en) 2011-04-04 2012-04-03 Reversible coating material nozzle for a spray gun for coating a workpiece with coating material
CN201280015272.8A CN103459045B (en) 2011-04-04 2012-04-03 Reversible coating material nozzle for a spray gun for coating a workpiece with coating material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11405240.0A EP2508267B1 (en) 2011-04-04 2011-04-04 Reversible coating material nozzle for a spray gun for coating a workpiece with coating material

Publications (2)

Publication Number Publication Date
EP2508267A1 EP2508267A1 (en) 2012-10-10
EP2508267B1 true EP2508267B1 (en) 2014-06-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP11405240.0A Active EP2508267B1 (en) 2011-04-04 2011-04-04 Reversible coating material nozzle for a spray gun for coating a workpiece with coating material

Country Status (6)

Country Link
US (1) US9433953B2 (en)
EP (1) EP2508267B1 (en)
CN (1) CN103459045B (en)
ES (1) ES2498920T3 (en)
PL (1) PL2508267T3 (en)
WO (1) WO2012135966A1 (en)

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ES2822287T3 (en) 2013-09-16 2021-04-30 Graco Minnesota Inc Spray tip and manufacturing procedure
CN103611648B (en) * 2013-11-03 2016-02-03 大连华工创新科技股份有限公司 Nozzle automatic flushing device
CA172971S (en) * 2016-08-19 2017-06-16 Sata Gmbh & Co Kg Spray gun
USD927645S1 (en) * 2018-10-31 2021-08-10 Carlisle Fluid Technologies (UK) Ltd Spray gun
USD877294S1 (en) * 2018-11-28 2020-03-03 Graco Minnesota Inc. Sprayer gun
USD875885S1 (en) * 2018-11-28 2020-02-18 Graco Minnesota Inc. Sprayer gun body
USD905822S1 (en) * 2018-12-04 2020-12-22 ROMER Sp. Cywilna Andrzej Ciura, Wojciech Ciura Spray gun
USD934383S1 (en) 2019-05-31 2021-10-26 Graco Minnesota Inc. Electrostatic spray gun
USD929539S1 (en) * 2019-05-31 2021-08-31 Graco Minnesota Inc. Electrostatic spray gun
USD937387S1 (en) 2019-12-31 2021-11-30 Graco Minnesota Inc. Compact spray gun
US11772117B2 (en) 2019-12-31 2023-10-03 Graco Minnesota Inc. Spray gun for spraying paints and other coatings
USD968569S1 (en) * 2020-08-19 2022-11-01 Ningbo Xianjia Electric Appliance Co., Ltd. Hand-held airbrush gun
USD992684S1 (en) * 2021-12-01 2023-07-18 Exair Corporation Ion air nozzle housing
CN115415077A (en) * 2022-09-19 2022-12-02 中山市君禾机电设备有限公司 Spraying machine

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Also Published As

Publication number Publication date
US20140044881A1 (en) 2014-02-13
CN103459045B (en) 2017-05-17
US9433953B2 (en) 2016-09-06
CN103459045A (en) 2013-12-18
PL2508267T3 (en) 2014-11-28
WO2012135966A1 (en) 2012-10-11
ES2498920T3 (en) 2014-09-26
EP2508267A1 (en) 2012-10-10

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