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EP2978538B1 - Pistolet de revêtement par pulvérisation pour le revêtement pulvérulent par pulvérisation d'objets - Google Patents

Pistolet de revêtement par pulvérisation pour le revêtement pulvérulent par pulvérisation d'objets Download PDF

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Publication number
EP2978538B1
EP2978538B1 EP14701054.0A EP14701054A EP2978538B1 EP 2978538 B1 EP2978538 B1 EP 2978538B1 EP 14701054 A EP14701054 A EP 14701054A EP 2978538 B1 EP2978538 B1 EP 2978538B1
Authority
EP
European Patent Office
Prior art keywords
coating
spray
channel
powder
compressed gas
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
EP14701054.0A
Other languages
German (de)
English (en)
Other versions
EP2978538A1 (fr
Inventor
Marco Sanwald
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.)
Gema Switzerland GmbH
Original Assignee
Gema Switzerland GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gema Switzerland GmbH filed Critical Gema Switzerland GmbH
Publication of EP2978538A1 publication Critical patent/EP2978538A1/fr
Application granted granted Critical
Publication of EP2978538B1 publication Critical patent/EP2978538B1/fr
Active legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—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
    • B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • 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
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0418—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces designed for spraying particulate material
    • 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
    • B05B7/14—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 designed for spraying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • 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
    • B05B7/24—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 with means, e.g. a container, for supplying liquid or other fluent material to a discharge device

Definitions

  • the present invention relates to a spray coating gun according to the preamble of independent claim 1.
  • the invention relates in particular to a spray-coating gun for spray-coating objects with coating powder, wherein the spray-coating gun has at its front end region a coating powder spray head for spraying coating powder and at its opposite rear end region a coating powder connection and at least one compressed gas connection.
  • Coating powder can be supplied to a coating powder channel extending to the coating powder spray head via the coating powder connection of the spray coating gun.
  • Compressed gas in particular compressed air, can be supplied to a compressed gas channel extending to the front end region of the spray coating gun via the at least one compressed gas connection of the spray coating gun.
  • the invention particularly relates to spray coating guns for coating powder which is pneumatically conveyed in a stream of compressed air.
  • the coating material is sprayed at the front end portion of the spray-coating gun through a material outlet of the coating powder spray head.
  • the material outlet may be, for example, through a material channel mouth with or without a Querablenkelement (baffle head or the like), be formed by a nozzle or by a Rotationszerstäuberelement.
  • the coating material is preferably electrostatically charged by frictional electricity and / or by high voltage of greater than 1000 volts, for example with a voltage in the range between 10,000 volts and 140,000 volts, to thereby achieve better adhesion to the object to be coated, preferably grounded To reduce scatter losses.
  • the spray-coating gun according to the invention may be a manual or an automatic powder spray device, which may comprise a spray nozzle or a rotary atomizer.
  • a coating powder conduit is connected to the coating powder port of the gun via which the coating powder to be sprayed is supplied to the spray coating gun, for example, from a powder reservoir or powder container.
  • the supply of the coating powder to be sprayed to the spray coating gun and the promotion of the coating powder through the coating powder line can be done in different ways.
  • a powder dispenser can be used for this purpose, which is usually also referred to as a powder injector.
  • a powder injector In such a Pulverinjektor the coating powder is conveyed by means of conveying compressed air from a powder container and fed to the coating powder connection of the spray-coating gun.
  • the powder container is supplied as needed via a fresh powder line fresh powder from a supplier container in which the powder supplier delivers the fresh powder to the powder user.
  • the powder forms a compact mass.
  • the coating powder in the powder container should be in a fluidized state, for example sucked by the suction of a Pulverinjektors and can be supplied in a compressed air stream of the spray device.
  • At least one powder pump is used to supply the coating powder to be sprayed to the spray coating gun and to convey the coating powder through the coating powder line.
  • the document describes EP 1 551 558 A1 a powder pump having a first powder chamber and a second powder chamber arranged parallel to the first powder chamber.
  • the powder chambers of the powder pump known from this prior art are limited both on the intake side and on the delivery side in each case by a mechanically actuated pinch valve arrangement.
  • the powder hoses connected to the respective powder chambers can be deformed with a mechanically actuated punch in order to squeeze or open the hose section as required.
  • the powder chambers of the known pump further each have a gas-permeable filter element.
  • a vacuum can be set separately in the powder chambers via a vacuum connection, as a result of which coating powder can be sucked into the powder chamber via the suction-side end region of the respective powder chamber. Subsequently, the pinch valve provided at the suction-side end portion of the powder chamber is closed, and the pinch valve provided at the delivery end portion of the powder chamber is opened. Due to the presence of an overpressure in the powder chamber, the coating powder previously sucked into the powder chamber is expelled again from the powder chamber via the delivery-side end region.
  • the publication DE202006015697U describes a spray-coating gun for spray-coating articles with coating powder, wherein at its front end region compressed gas is supplied to the coating powder conveyed through a coating powder channel.
  • This spray-coating gun has a single pressurized gas port and a single pressurized gas passage extending to the forward end portion of the spray-coating gun.
  • the object of the invention is to develop a spray coating gun of the type mentioned in the introduction such that the coating quality achievable with the spray coating gun can be optimized independently of the powder coating promotion.
  • the solution according to the invention ensures that, with the spray-coating gun, it is always possible to achieve an optimum spray coating result, irrespective of the manner in which the coating powder is supplied to the spray-coating gun.
  • plastic but also enamel powder can be sprayed, which is supplied to the spray-coating gun, for example with an injector pump or a dense phase pump.
  • the additional compressed air at the rear end region of the spray-coating gun is fed into the coating powder channel. This measure ensures that the additional compressed air introduced into the coating powder channel can mix with the coating powder introduced into the coating powder channel over a sufficiently long path, so that at the front end of the coating powder channel, i.
  • a filter element which is permeable to compressed gas, but not for coating powder.
  • coating powder can penetrate into the compressed gas channel, ie counter to the compressed gas supply direction.
  • care is taken that no coating powder can be deposited in the compressed gas lines of the spray-coating gun, so that the spray-coating gun can be cleaned very easily.
  • a powder change in the spray coating gun according to the invention can be carried out in a very short time.
  • the spray-coating gun has a shaft housing with a front and a rear end region, wherein the coating powder spray head is fastened or attachable to the front end region of the shaft housing.
  • the at least one compressed gas channel is formed, which extends in the shaft housing longitudinal direction at least partially through the shaft housing.
  • the spray coating gun has not only a shaft housing but also a fitting.
  • the connecting piece is fastened or attachable for connecting at least one compressed gas line to the rear end region of the shaft housing and preferably has a passage opening in the longitudinal direction of the shaft housing.
  • a tubular mounting hollow body is provided in this exemplary embodiment.
  • the tubular mounting hollow body is inserted or insertable into the passage opening of the connection piece in the shaft housing longitudinal direction.
  • the tubular mounting hollow body is formed to mechanically clamp in its state inserted in the passage opening of the connecting piece, the connecting piece in the direction of the shaft housing.
  • the fastening hollow body prefferably has a coupling region for coupling to the shaft housing and a forwardly facing clamping surface with which the connecting piece can be tensioned in the direction of the shaft housing by coupling the fastening hollow body to the shaft housing.
  • the example designed as a hollow screw tubular mounting hollow body has a passage in the shaft housing longitudinal direction.
  • coating powder can be fed to the coating powder channel of the spray coating gun extending to the coating powder spray head.
  • the shaft housing is formed from a plastic material, wherein the coating powder channel extending to the coating powder spray head and / or the compressed gas channel extending to the front end region of the spray coating gun is / is formed in the plastic material of the shaft housing.
  • the coating powder channel extending to the coating powder spray head is formed by a coating material tube which can be inserted into the shaft housing in the longitudinal direction of the shaft housing. If, as in the last-mentioned embodiment, the coating powder channel of the spray-coating gun is formed by a coating material tube, it is advantageous if this coating-material tube can be fastened in the spray-coating gun by means of the tubular mounting hollow body.
  • the spray-coating gun has a shaft housing and a connection piece fastened or attachable to the rear end region of the shaft housing.
  • connection piece has the particular advantage that the rear part of the spray coating gun is made interchangeable, in particular depending on the type of coating powder supply, a corresponding connection piece is attached to the shaft housing of the spray coating gun. In this way, it is always ensured that irrespective of the coating powder feed (for example with an injector pump or a dense phase pump), there is always atomizable coating powder, which takes place, if necessary, by supplying additional air via the compressed gas branch to the coating powder channel.
  • connection piece thus forms the interface of the spray coating gun, wherein at least one compressed gas connection and a hose connection for coating powder are formed at the rear end region of the connection piece.
  • a connection or passage for a low voltage cable may be provided at the rear end portion of the fitting when the spray coating gun has a high voltage generator to generate the high voltage electrical voltage required to electrostatically charge the coating powder.
  • the connecting piece Through the connecting piece runs at least one pressure gas bore through which compressed gas can be supplied to the pressure gas channel formed in the shaft housing.
  • the forward end of the compressed gas bore extending through the fitting is axially opposite the rear end of the at least one pressurized gas passage formed in the shaft housing.
  • the compressed gas bore extending through the connecting piece is in fluid communication with the at least one compressed gas channel formed in the shaft housing.
  • the pressure gas bore extending through the connecting piece is also in fluid communication with the passage channel passing through the mounting hollow body in order to supply in this way the pressurized gas necessary for adjusting the powder-air mixture optimal for the atomization or for homogenizing the coating powder to the coating powder conveyed through the through-channel.
  • a filter element of microporous material is provided, which is permeable to compressed gas, but not to coating powder.
  • this filter element at least partially forms the wall of the passing through the mounting hollow body through-channel.
  • the filter element is designed as a hollow cylinder and is arranged coaxially and concentrically with respect to the passage channel passing through the mounting hollow body.
  • the filter element is preferably received in the passageway of the mounting hollow body so that it is exchangeable.
  • the exemplary embodiment of the spray-coating gun 1 according to the invention shown in the drawings is preferably designed for spraying coating powder, which is pneumatically conveyed, in particular in a compressed air stream, for example by means of an injector pump or with the aid of a sealing-flow pump.
  • the exemplary embodiment of the spray-coating gun 1 according to the invention has a shaft housing 2, on the front end region 3 of which a coating powder spray head 5 can be fastened or fastened.
  • This coating powder spray head 5 forms a coating material discharge outlet.
  • a connecting piece 8 is fastened or fastened.
  • the connecting piece 8 serves to connect at least one compressed gas line, a coating powder line, and a low-voltage electrical supply.
  • two compressed gas ports 13, 14 and a coating powder connection 12, for example in the form of a hose connecting piece, are provided at the rear end region of the connecting piece 8.
  • a low-voltage cable 32 runs through the connector 8, a low-voltage cable 32.
  • This low-voltage cable 32 is used for electrical supply of an in a bulge 16 of the shaft housing 2 recorded high voltage generator, which generates the required for the operation of a high voltage electrode high voltage.
  • the connecting piece 8 has a passage opening 17, which extends in the longitudinal direction L of the shaft housing 2.
  • a tubular mounting hollow body 18 is received, which forms a channel 26 for supplying coating powder to a coating powder channel 11 extending through the shaft housing 2 in the longitudinal direction L of the shaft housing 2.
  • the spray coating gun it is advantageous if in the spray coating gun no replaceable or separate coating material tube is used, which can be inserted in the coating powder channel 11 formed in the shaft housing 2, in order to reduce the number of components of the spray coating gun 1 to a minimum. Rather, it is provided in the exemplary embodiment of the spray-coating gun that at least the shaft housing 2 is formed of a plastic material, wherein in the longitudinal direction L of the shaft housing 2 by the shaft housing 2 extending coating powder channel 11 is formed in the plastic material of the shaft housing 2.
  • a separate coating material tube can be used for supplying coating powder, which extends in the assembled state of the spray coating gun in the longitudinal direction L of the shaft housing 2.
  • the coating powder spray head 5 can, for example, as shown in the FIGS. 1a to 1d and 2 B a nozzle 6, which is fixed by a union nut 7 at the front end portion 3 of the shaft housing 2.
  • the tube-like mounting hollow body 18 received in the passage opening 17 of the connecting piece 8 serves for fastening the connecting piece 8 to the rear end region 4 of the shaft housing 2.
  • the tubular mounting hollow body 18 is designed as a hollow screw.
  • the hollow mounting body 18 in the form of a hollow screw can be inserted through the through-opening 17 of the connecting piece 8 in the longitudinal direction L of the shaft housing 2 and preferably forms a sliding sliding fit with the wall of the through-opening 17.
  • the hollow hollow screw mounting hollow body 18 has an axial passage opening 19 in the longitudinal direction L of the shaft housing 2.
  • the axial through hole 19 of the hollow screw mounting hollow body 18 forms a channel 26 for coating powder, wherein in the fully assembled state of the spray coating gun 1 of this from the axial passage opening 19th formed channel 26 for coating powder with the formed in the shaft housing 2 coating powder channel 11 axially aligned.
  • the transition between the coating powder channel 26 formed through the axial through-hole 19 and the coating powder channel 11 formed in the shaft housing 2 is made stepless to prevent deposition of powder residues in the operation of the spray-coating gun 1.
  • a coating material tube which can be inserted into the shaft housing 2 of the spray-coating gun 1 is used in the spray-coating gun 1, the rear end region of the coating material tube preferably becomes the hollow through-hole 19 of the coating material tube trained mounting hollow body 18 was added.
  • the fastening hollow body 18 embodied as a hollow screw has a thread 20, preferably an external thread and preferably at the front end region of the fastening hollow body 18 designed as a hollow screw and serves for screwing on a thread 21 formed in the shaft housing 2 in a complementary manner.
  • the spray coating gun 1 formed as a hollow screw mounting hollow body 18 in addition to the thread 20 has a forward facing clamping surface 22 of a screw head 23.
  • the connecting piece 8 can be tensioned in the direction of the shaft housing 2.
  • the forward facing clamping surface 22 is in this case clamped against a rearwardly facing end face 24 or against a rearwardly facing transverse surface of the connecting piece 8.
  • the coating powder channel 11 extending through the shaft housing 2 in the longitudinal direction L and the axial passage opening 19 of the hollow mounting body 18 which forms a channel 26 for coating powder which is axially aligned with the coating powder channel 11 formed in the shaft housing 2 have a common central longitudinal axis 25.
  • the inner wall of the axial passage opening 19 of the fastening hollow body 18 designed as a hollow screw forms, at least in regions, the entire circumference of the coating powder channel 26 extending through the connecting piece 8 in the longitudinal direction L of the shaft housing 2.
  • the shaft housing 2 is preferably a one-piece material body made of plastic. According to other embodiments, it could also be designed in several parts, and / or consist of another, electrically conductive or preferably electrically insulating material.
  • the thread 21 of the shaft housing 2 for fastening the hollow mounting body 18 designed as a hollow screw is preferably formed by the shaft housing 2 itself. Alternatively, however, it is also conceivable, if for this purpose a threaded body is anchored in the shaft housing 2 rotatably.
  • the connecting piece 8 is also preferably a one-piece body, preferably made of metal, so that it is electrically conductive and can be used as an electrical conduction path, which is connectable to ground potential. According to other embodiments, however, the connecting piece 8 could also be made of electrically non-conductive material, in particular plastic.
  • the fastening hollow body 18 designed as a hollow screw defines the position of the coating powder connection 12 relative to the connection piece 8 and thus also relative to the shaft housing 2 and supports the coating powder connection 12, which is formed in the illustrated in the drawings exemplary embodiment of the spray coating gun 1 according to the invention as a hose connector.
  • the fixing hollow body 18 designed as a hollow screw also defines the position of the coating powder channel 26 passing through the connecting piece 8 relative to the connecting piece 8 and thus also the position of the coating powder channel 11 formed in the shaft housing 2.
  • another tubular mounting hollow body 18 can be used to fasten the hollow body To attach connector 8 at the rear end portion 4 of the shaft housing 2 releasably.
  • a thread 20 at the front end portion of the mounting hollow body 18 may be provided a differently shaped coupling portion which is coupled to a mating, preferably complementary trained coupling part of the shaft housing 2 (formed by the shaft housing 2 or inserted therein or attached thereto).
  • one of the two parts mounting hollow body 18 or shaft housing 2 may be formed as a plug-in coupling and the other part as a jack.
  • the coupling portion of the mounting hollow body 18 is designed as a plug part and the coupling part of the shaft housing 2 as a coupling coupling.
  • One of these two may have a catch or another locking element which can be latched on a blocking surface extending in the coating powder channel transverse direction.
  • one of the two parts may be provided with a transverse pin which can be inserted and then rotated in an L-shaped groove formed in the coating powder channel longitudinal direction and formed on the other part, similar to a bayonet closure.
  • a hose connector 12 is inserted from behind and axially fixed in the axial passage opening 19 of the hollow mounting body 18 designed as a hollow screw.
  • the hose connection piece 12 forms the coating powder connection, via which coating powder can be fed to the coating powder channel 26 or 11 extending in the longitudinal direction L of the shaft housing 2.
  • the hose connector 12 has a rearwardly projecting plug portion 27 for insertion of a coating material hose.
  • the hose connection piece 12 it is also conceivable for the hose connection piece 12 to have an end section slotted from the rear to the front, which is divided into fingers by the slots, which can be tensioned onto the coating material hose by a tensioning ring.
  • the terminal 8 has at its front end an outer circumference identical to the outer periphery of the rear end portion 4 of the shaft housing 2.
  • the outer circumference of the connecting piece 8 at its front end for example, smaller than the circumference of the rear end portion 4 of the shaft housing 2.
  • Other circumference ratios are also possible.
  • a transition piece which has a front end adapted to the circumference of the shaft housing 2 and a rear end adapted to the circumference of the connecting piece 8.
  • the transition piece can be axially clamped by the formed as a hollow screw mounting hollow body 18 between a forward facing transverse surface of the connecting piece 8 and a rearwardly facing end face of the shaft housing 2 and serves to the peripheral shape and circumferential size of the rear end portion 4 of the shaft housing 2 to the peripheral shape and Adjust the circumferential size of the front end portion of the connecting piece 8.
  • the front end portion of the fitting 8 is in shape and size to the rear end portion 4 of the shaft housing 2 adapted so that no transition piece is required.
  • each compressed gas channel 9, 10 is the front end of each one formed in the fitting 8 compressed gas bore 28, 29 axially opposite.
  • the two pressure gas bore 28, 29 extend through the connector 8 longitudinally therethrough and have at the rear end a thread 30 for a connection nipple of a (not shown) compressed gas hose or for a screw plug.
  • a total of two pressurized gas bores 28, 29 are formed in the connecting piece 8, which are arranged on both sides of the hollow mounting body 18 and the coating powder channel 26.
  • a total of 2 compressed gas channels 9, 10 are formed in the shaft housing 2 .
  • One of the two pressure gas ducts 9, 10 serves, for example, for supplying compressed air (or another gas) which flows over one or more high-voltage electrodes, which are arranged after, on or in the front end region 4 of the shaft housing 2 and for the electrostatic charging of powder coating material High voltage supplied by a high voltage generator.
  • the other compressed gas channel 10, 9 is for supplying compressed air (or other gas) for influencing the coating material flow flowing through the coating powder channel 11.
  • a part of the connecting piece 8 is according to, for example, the illustration in FIG Fig. 2a as a socket 31 for receiving and fixing a cable connection body of a power cable 32 is formed.
  • the socket 31 extends in the longitudinal direction L of the shaft housing 2 parallel to the passage opening 17, in which the mounting hollow body 18 designed as a hollow screw is inserted.
  • the socket 31 is preferably a passage opening formed in the connecting piece 8, preferably in the form of a socket to the plug-in receptacle of the correspondingly designed as a plug connector body.
  • the cable connection body may have at its front end at least one electrically conductive contact element for contacting at least one electrically conductive contact element which is provided at the rear end of the shaft housing 2 for low voltage supply from the cable 32 to the high voltage generator.
  • the cable connection body preferably has a jacket of electrically conductive material which is connected on the one hand to an electrical grounding conductor in the cable 32 and on the other hand contacted in the socket 31 of the connecting piece 8 and thereby electrically connected thereto.
  • the high-voltage generator is not accommodated in the shaft housing 2, and in particular in the bulge 16 formed in the shaft housing 2, but externally thereof.
  • the cable 32 is not a low voltage cable, but a high voltage cable which conducts the high voltage from an external high voltage generator into the shaft housing 2 and conducts in this through an electrical line to the at least one high voltage electrode.
  • the connecting piece 8 has a double function: On the one hand, the connecting piece 8 serves as an interface for supplying compressed gas, electrical energy and coating powder to the spray-coating gun 1. On the other hand, in the case of the exemplary embodiment shown in the drawings, the connection piece 8 also has the function of a fastening section for fastening to a carrier element (not shown). It is conceivable that the carrier element has a tubular attachment portion, which is attachable to the attachment portion 33 of the connector and forms a wobble-free seat.
  • the carrier element (not shown in the drawings) can be secured to the connecting piece 8 and in particular to the attachment portion 33 of the connecting piece 8 axially and / or in the circumferential direction of rotation by a resilient latch 34, which has, for example, a detent head on a spring strip which on the connecting piece 8 is fixed and can be latched in a transverse opening, which is formed on the carrier element.
  • the catch 34 automatically engages in the transverse opening of the carrier element when the carrier element has reached its axial and circumferential end position when it is plugged onto the attachment section 33 of the connecting piece 8.
  • the carrier element (not shown in the drawings) may be attached to a carrier, for example a lifting stand or a robotic arm, or to a handle.
  • a rearwardly projecting tubular support member of electrically insulating or preferably made of electrically conductive material, which is formed at the front end portion compatible with the mounting portion 33 of the connecting piece 8 and with the mounting portion 33 of Connecting piece 8 can be releasably connected.
  • the coating material supply line which is connected or connectable to the hose connection piece 12, and also all other material supply and / or energy supply lines extend through the tubular carrier element, in particular the power cable 32 and compressed gas lines for the various compressed gases, For example, compressed air, for which, for example, the compressed gas channels 9, 10 are provided in the shaft housing 2.
  • a second connection piece in the same or different embodiment as the connection piece 8 of the spray coating gun 1 can be provided, via which the tubular support element can be fastened to a support together with the spray coating gun.
  • a total of two pressure gas channels are each formed by a shaft housing 2 Pressure gas channel 9, 10 and a correspondingly formed in the connection piece 8 and also in the longitudinal direction L of the shaft housing 2 extending pressure gas bore 28, 29 is formed.
  • this coating powder is always in a sprayable state on the coating powder spray head 5 of the spray coating gun 1, it is provided in the spray coating gun 1 according to the invention that additional air is introduced into the coating powder channel 11 can be initiated.
  • At least one of the two compressed gas bores 28, 29 formed in the connecting piece 8 is in fluid communication with the coating powder channel 26 passing through the hollow hollow body 18 designed as a hollow screw Supplying compressed gas to the coating powder conveyed through the coating powder channel 26.
  • the fluid connection between the pressure gas bores 28, 29 on the one hand and the coating powder channel 26 on the other hand is formed by an additional pressure gas bore 35, 36 running transversely to the longitudinal direction L of the shaft housing 2.
  • additional pressure gas bores 35, 36 are part of an additional compressed air inlet device, which is integrated in the connection piece 8 of the spray coating gun 1 in the exemplary embodiment of the spray coating gun 1 according to the invention shown in the drawings.
  • the auxiliary compressed air inlet device has a filter element 37 (filter tube) designed as a hollow cylinder which surrounds the coating powder channel 26 formed in the tubular mounting hollow body 18 over a partial length of 360 ° in the exemplary embodiment shown in the drawings so that the coating powder passes through the filter tube channel 38 can flow through it.
  • Compressed gas or compressed air can from the two formed in the fitting 8 compressed gas holes 28, 29 via the additional pressure gas holes 35, 36 flow to a compressed air ring chamber 39 which surrounds the tubular filter element 37 on its outer periphery. From the compressed air ring chamber 39, the additional compressed air can flow through the tubular filter element 37 into the filter tube channel 38.
  • the tubular filter element 37 is made of microporous material such that it is permeable to air but not to coating powder.
  • the tubular filter element 37 preferably consists of a sintered body, for example of metal or plastic, or of a metal or plastic-containing material mixture. Furthermore, it may consist of a different material and / or be formed by a filter membrane.
  • the filter pores of the tubular filter element 37 are preferably designed such that compressed air, which is supplied from the compressed gas bores 28, 29 via the additional pressure gas bores 35, 36, is conducted into the powder path via a powder path region which is large both in the circumferential direction and in the longitudinal direction of the powder path ,
  • These micropores of the tubular powder element 37 may be inclined radially or in the axial direction to the powder path and / or open tangentially to the powder path circumference from the tubular powder element 37 into the filter tube channel 38 and direct the compressed air accordingly.
  • the axial powder distribution in the coating powder channel 26 and thus in the coating powder channel 11 formed in the shaft housing 2 can be homogenized with a small amount of additional compressed air.
  • pulsations of the powder flow in the powder path can be avoided or at least reduced.
  • a homogenization of the powder density in the longitudinal direction and over the cross section of the powder path can be achieved.
  • the additional compressed air length per unit time can be kept so low that it has no or only a small influence on the flow rate of the coating powder in the coating powder channel 11.
  • the additional compressed air may flow in the form of jets or in the form of small air bubbles from the tubular filter element 37 into the filter tube channel 38, depending on the type of filter pores and the pressure of the additional compressed air.
  • the pressure of the compressed air ring chamber 39 supplied additional compressed air can be adjusted by a suitable choice of the effective diameter of the additional pressure gas bores 35, 36. But it is also conceivable that the pressure of the additional compressed air is varied by changing the pressure of the compressed gas, which is the compressed gas wells 28, 29 (via the compressed gas ports 13, 14) is supplied.
  • the tubular filter element 37 of the auxiliary compressed air inlet device integrated in the connector 8 should extend around at least 270 ° of the powder path perimeter, preferably over the full 360 ° of the powder path perimeter around the powder path defined by the coating powder channel 26.
  • the length of the tubular filter element 37 preferably extends over at least 5 mm length of the powder path.
  • the tubular filter element 37 of the additional compressed air inlet device is preferably a rigid body. But it could also be a flexible body.
  • the tubular filter element 37 is inserted in the illustrated in the drawings exemplary embodiment of the spray coating gun 1 according to the invention from behind into the axial through hole 19 of the tubular hollow mounting hollow body 18 formed as a hollow screw.
  • the front end portion of the tubular filter element 37 abuts against a corresponding stop surface 40, which is formed within the axial passage opening 19 of the mounting hollow body 18 designed as a hollow screw.
  • the rear end region of the filter element 37 is fixed by the front end region of the hose connecting piece 12 inserted into the axial passage opening 19 of the mounting hollow body 18.
  • the tubular Filter element 37 within the axial passage opening 19 of the hollow mounting hollow body 18 designed as a hollow screw conceivable.
  • the filter element is received interchangeably in the passage of the mounting hollow body.
  • control device may advantageously be designed such that by means of it the per unit of time flowing through the additional compressed air inlet device additional compressed air quantity depending on the delivered powder amount is adjustable according to at least one of the following: for example, manually adjustable and / or preferably automatically controllable or preferably controllable.
  • the additional compressed air flow rate i. the amount of additional compressed air introduced via the filter element 37 into the filter tube channel 38 and thus into the coating powder channel 26 can be varied by exchanging the filter element 37 accommodated in the axial passage opening 19 of the mounting hollow body 18 with a filter element having a different pore size or air permeability ,
  • the air permeability of the filter element 37 can - if desired - also be reduced to zero; then the filter element 37 is replaced by an air-permeable cylinder element.

Landscapes

  • Nozzles (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Claims (15)

  1. Pistolet de revêtement par pulvérisation (1) pour revêtir par pulvérisation des objets avec une poudre de revêtement, le pistolet de revêtement par pulvérisation (1) comprenant à son extrémité avant une tête de pulvérisation de poudre (5) pour pulvériser la poudre de revêtement, et à son extrémité arrière opposée un raccord (12) à poudre de revêtement ainsi qu'un premier et un second raccord (13, 14) à gaz sous pression, dans lequel la poudre de revêtement peut être amenée via le raccord (12) à poudre de revêtement jusque dans un canal à poudre de revêtement (11, 26) qui s'étend vers la tête de pulvérisation (5), et un gaz sous pression peut être amené via le premier raccord (13) à gaz sous pression jusqu'à un canal à gaz sous pression (9, 28) qui s'étend jusque dans la zone d'extrémité avant du pistolet de revêtement par pulvérisation (1), et un gaz sous pression peut être amené via le second raccord (14) à gaz sous pression jusqu'à un canal à gaz sous pression (10, 29) qui s'étend vers la zone d'extrémité avant du pistolet (1), afin d'influencer un flux de matériau de revêtement qui passe par le canal (11, 26) à poudre de revêtement, dans lequel le second canal à gaz sous pression (10, 29) présente au moins une ramification de gaz sous pression (35, 36) via laquelle une partie au moins du gaz sous pression amené au second canal à gaz sous pression (10, 29) est amenée au canal à poudre (11, 26) afin de régler un mélange poudre/air nécessaire pour la pulvérisation au niveau de la tête (5) de pulvérisation de poudre de revêtement et/ou afin d'homogénéiser la poudre de revêtement amenée au canal à poudre de revêtement (11, 26), et
    ladite au moins une ramification de gaz sous pression (35, 36) est agencée dans la zone d'extrémité arrière du pistolet de revêtement par pulvérisation (1).
  2. Pistolet de revêtement par pulvérisation (1) selon la revendication 1, dans lequel un élément de filtrage (37) est prévu dans la ramification de gaz sous pression (35, 36), qui est perméable au gaz sous pression, mais non pas à la poudre de revêtement.
  3. Pistolet de revêtement par pulvérisation (1) selon la revendication 1 ou 2, dans lequel le pistolet de revêtement par pulvérisation (1) comprend ce qui suit :
    a) un boîtier à tige (2) présentant des zones d'extrémité avant et arrière (3, 4), dans lequel la tête de pulvérisation (5) est fixée ou est fixable dans la zone d'extrémité avant (3) du boîtier à tige (2), et au moins un canal à gaz sous pression (9, 10) est réalisé dans le boîtier à tige (2), qui s'étend en direction longitudinale (L) du boîtier à tige au moins localement à travers le boîtier à tige (2) ;
    b) une pièce de raccordement (8) qui est fixée ou fixable à la zone d'extrémité arrière du boîtier à tige (2) pour raccorder au moins une conduite à gaz sous pression, et qui présente une ouverture traversante (17) en direction longitudinale (L) du boîtier à tige ;
    c) un corps creux de fixation (18) de forme tubulaire pour fixer la pièce de raccordement (8) sur le boîtier à tige (2).
  4. Pistolet de revêtement par pulvérisation (1) selon la revendication 3,
    dans lequel le corps creux de fixation (18) est inséré ou susceptible d'être inséré dans l'ouverture traversante (17) de la pièce de raccordement (8) en direction longitudinale (L) du boîtier à tige ; et/ou
    dans son état inséré dans l'ouverture traversante (17) de la pièce de raccordement (8), le corps creux de fixation (18) est réalisé pour serrer la pièce de raccordement (8) en direction vers le boîtier à tige (2).
  5. Pistolet de revêtement par pulvérisation (1) selon la revendication 3 ou 4,
    dans lequel le corps creux de fixation (18) comprend une zone de couplage (20) pour le coupler au boîtier à tige (2) et une surface de serrage (22) dirigée vers l'avant par laquelle la pièce de raccordement (8) est susceptible d'être serrée en direction vers le boîtier à tige (2) par le couplage du corps creux de fixation (18) au boîtier à tige (2).
  6. Pistolet de revêtement par pulvérisation (1) selon la revendication 5,
    dans lequel le corps creux de fixation (18) est une vis creuse dont la zone de couplage (20) présente un filetage pour la visser dans un taraudage (21) réalisé sur le boîtier à tige (2).
  7. Pistolet de revêtement par pulvérisation (1) selon l'une des revendications 3 à 6,
    dans lequel le corps creux de fixation (18) présente un canal traversant (19) en direction longitudinale (L) du boîtier à tige, la poudre de revêtement pouvant être amenée à travers le canal traversant (19) jusqu'au canal à poudre de revêtement (11) qui s'étend vers la tête (5) de pulvérisation de poudre de revêtement.
  8. Pistolet de revêtement par pulvérisation (1) selon l'une des revendications 3 à 7,
    dans lequel l'extrémité arrière dudit au moins un canal à gaz sous pression (9, 10) est axialement en regard de l'extrémité avant d'un perçage à gaz sous pression (28, 29) passant par la pièce de raccordement (8), et le perçage à gaz sous pression (28, 29) passant par la pièce de raccordement (8) est en communication fluidique avec le canal (26) à poudre de revêtement passant par le corps creux de fixation (18) pour amener le gaz sous pression vers la poudre de revêtement acheminée à travers le canal à poudre de revêtement (26).
  9. Pistolet de revêtement par pulvérisation (1) selon la revendication 8,
    dans lequel, pour empêcher la pénétration de poudre de revêtement à l'encontre de la direction d'amenée de gaz sous pression, un élément de filtrage (37) en matériau microporeux est prévu dans le perçage à gaz sous pression (28, 29), qui est perméable au gaz sous pression, mais non pas à la poudre de revêtement.
  10. Pistolet de revêtement par pulvérisation (1) selon la revendication 7 et 9,
    dans lequel l'élément de filtrage (37) constitue au moins localement la paroi du canal traversant (19) ou du canal à poudre de revêtement (26) passant par le corps creux de fixation (18).
  11. Pistolet de revêtement par pulvérisation (1) selon la revendication 10,
    dans lequel l'élément de filtrage (37) est réalisé sous forme de cylindre creux et est agencé coaxialement et concentriquement par rapport au canal traversant (19) ou au canal à poudre de revêtement (26) passant par le corps creux de fixation (18).
  12. Pistolet de revêtement par pulvérisation (1) selon l'une des revendications 10 et 11,
    dans lequel l'élément de filtrage (37) est reçu dans le canal traversant (19) ou dans le canal à poudre de revêtement (26) du corps creux de fixation (18), de préférence de façon interchangeable.
  13. Pistolet de revêtement par pulvérisation (1) selon l'une des revendications 3 à 12,
    dans lequel le boîtier à tige (2) est réalisé en matière plastique et le canal à poudre de revêtement (11) s'étendant vers la tête (5) de pulvérisation de poudre de revêtement et/ou le canal à gaz sous pression (9, 10) s'étendant vers la zone d'extrémité avant du pistolet de revêtement par pulvérisation (1) est/sont réalisé(s) dans la matière plastique du boîtier à tige (2).
  14. Pistolet de revêtement par pulvérisation (1) selon l'une des revendications 3 à 12,
    dans lequel le canal à poudre de revêtement (11, 26) s'étendant vers la tête de pulvérisation (5) est formé par un tube à matériau de revêtement qui est enfichable dans le boîtier à tige (2) en direction longitudinale (L) de la tige.
  15. Pistolet de revêtement par pulvérisation (1) selon la revendication 14,
    dans lequel le tube à matériau de revêtement est fixable à l'aide du corps creux de fixation (18).
EP14701054.0A 2013-03-26 2014-01-21 Pistolet de revêtement par pulvérisation pour le revêtement pulvérulent par pulvérisation d'objets Active EP2978538B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013205362.2A DE102013205362A1 (de) 2013-03-26 2013-03-26 Sprühbeschichtungspistole zur Sprühbeschichtung von Gegenständen mit Beschichtungspulver
PCT/EP2014/051115 WO2014154373A1 (fr) 2013-03-26 2014-01-21 Pistolet pulvérisateur, pour revêtement par pulvérisation d'objets au moyen d'une poudre de revêtement

Publications (2)

Publication Number Publication Date
EP2978538A1 EP2978538A1 (fr) 2016-02-03
EP2978538B1 true EP2978538B1 (fr) 2017-11-22

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EP14701054.0A Active EP2978538B1 (fr) 2013-03-26 2014-01-21 Pistolet de revêtement par pulvérisation pour le revêtement pulvérulent par pulvérisation d'objets

Country Status (7)

Country Link
US (1) US10159994B2 (fr)
EP (1) EP2978538B1 (fr)
CN (1) CN105073270B (fr)
BR (1) BR112015024202A2 (fr)
DE (1) DE102013205362A1 (fr)
TR (1) TR201802301T4 (fr)
WO (1) WO2014154373A1 (fr)

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CN109046820B (zh) * 2018-11-02 2019-08-02 山东大学 一种多级同步混粉器及热喷涂装置
CN109622258A (zh) * 2019-02-01 2019-04-16 内蒙古工业大学 一种应用于喷涂间的平面窗口密封结构
CN116328985A (zh) * 2023-03-07 2023-06-27 中建安装集团有限公司 一种用于管道外壁焊口处防腐蚀的酸洗钝化液喷涂装置
CN116273754A (zh) * 2023-03-22 2023-06-23 江苏上上电缆集团有限公司 一种电缆用半导电胶喷涂方法

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Also Published As

Publication number Publication date
DE102013205362A1 (de) 2014-10-02
BR112015024202A2 (pt) 2017-07-18
CN105073270A (zh) 2015-11-18
US10159994B2 (en) 2018-12-25
TR201802301T4 (tr) 2018-03-21
WO2014154373A1 (fr) 2014-10-02
US20160051996A1 (en) 2016-02-25
CN105073270B (zh) 2018-06-15
EP2978538A1 (fr) 2016-02-03

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