WO2014154373A1 - Sprühbeschichtungspistole zur sprühbeschichtung von gegenständen mit beschichtungspulver - Google Patents
Sprühbeschichtungspistole zur sprühbeschichtung von gegenständen mit beschichtungspulver Download PDFInfo
- Publication number
- WO2014154373A1 WO2014154373A1 PCT/EP2014/051115 EP2014051115W WO2014154373A1 WO 2014154373 A1 WO2014154373 A1 WO 2014154373A1 EP 2014051115 W EP2014051115 W EP 2014051115W WO 2014154373 A1 WO2014154373 A1 WO 2014154373A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coating
- spray
- powder
- coating powder
- shaft housing
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- 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 particularly relates to a spray-coating gun for spray-coating objects with coating powder
- the spray-coating gun has a coating powder spray head for spraying coating powder at its front end region and a coating powder connection and at least one compressed gas connection at its opposite rear end region.
- Coating powder can be fed 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
- 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, through which the coating powder to be sprayed is supplied to the spray-coating gun, for example, from a powder reservoir or powder container.
- the feeding of the coating powder to be sprayed to the spray-coating gun and the conveyance of the coating powder through the coating powder line can take place in different ways.
- a powder dispenser can be used for this purpose, which is usually also referred to as a powder injector.
- the coating powder is conveyed from a powder container by means of delivery compressed air and supplied to the coating powder connection of the spray coating gun.
- flows inside the Pulverinjektors a mixture of conveying compressed air and powder through a powder channel of a catching nozzle, wherein with the help of the catching nozzle the powder-conveying air mixture additionally metering air is mixed in order to achieve a defined total air flow.
- 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.
- EP 1 551 558 A1 describes a powder pump which has 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 suction side and on the conveyor side by a mechanically actuated pinch valve arrangement. Specifically, it is provided that in the suction-side or delivery-side area of the powder pump, the powder hoses connected to the respective powder chambers can be deformed with a mechanically actuated ram 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 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 invention proposes a spray-coating gun which 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, while pressurized gas can be fed 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.
- Spray coating gun extending pressure gas duct has at least one compressed gas branch via which at least a portion of the compressed gas added to the compressed gas channel is supplied to the extending to the coating powder spray head coating powder channel.
- the coating powder supplied to the coating powder channel can be sufficiently homogenized.
- a necessary for the atomization of the coating powder spray head of the gun powder-air mixture can be optimally adjusted.
- additional air in the form of compressed gas can be fed into the coating powder channel of the spray-coating gun in an easy-to-implement yet effective manner to ensure that the coating powder supplied in the coating powder channel is always atomizable.
- the present invention allows the coating powder to be fed into the spray coating gun or into the relatively high density coating powder channel. Sufficient homogenization of the coating powder fed into the coating powder channel as well as adjustment of the optimum powder-air mixture for atomization on the coating powder spray head of the gun take place through the additional air introduced into the coating powder channel via the compressed gas branch from the compressed gas channel.
- the solution according to the invention ensures that the spray coating gun always achieves 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 is fed into the coating powder channel at the rear end region of the spray coating gun. This measure ensures that the additional compressed air introduced into the coating powder channel can mix for a sufficiently long distance with the coating powder introduced into the coating powder channel, so that a particularly homogenous powder coating is present at the front end of the coating powder channel, ie the coating powder spray head.
- 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 in the shaft housing, 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 order to fix the connecting piece to the shaft housing. It is conceivable here that 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, in its inserted in the through hole of the connecting piece state, the connecting piece in the direction of the shaft housing to mechanically clamp nen.
- 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.
- this is a hollow screw whose coupling region has a thread for screwing into a thread arranged on 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 supplied to the spray-coating gun extending to the coating powder spray head by means of this through-channel formed in the mounting hollow body.
- 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 designed to be interchangeable, wherein in particular a corresponding connection piece is fastened to the shaft housing of the spray-coating gun, depending on the type of coating powder feed. In this way, it is always ensured that irrespective of the coating powder feed (for example with an injector pump or a dense-flow 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.
- the 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 needed 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 connecting piece When the connecting piece is fastened to the rear end region of the shaft housing, the front end of the compressed gas bore extending through the connecting piece lies axially opposite the rear end of the at least one compressed gas channel formed in the shaft housing. In this way, 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 passage channel passing through the mounting hollow body. It is conceivable in this case, in particular, if 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.
- Fig. 1a is a plan view of an exemplary embodiment of the invention
- Spray coating gun according to the invention.
- FIG. 1b is a side view of the exemplary embodiment of the spray-coating gun of the invention
- FIG. Fig. 1c is a bottom view of the exemplary embodiment of the spray-coating gun of the invention
- FIG. 1d shows a front view of the coating powder spray head of the exemplary embodiment of the spray-coating gun according to the invention
- FIG. 11 is a rear view of the fitting of the exemplary embodiment of the spray-coating gun of the invention.
- Fig. 2a a perspective view from the rear of the exemplary
- Embodiment of the spray coating gun according to the invention a perspective view from the front of the exemplary embodiment of the spray-coating gun according to the invention;
- Fig. 3 side view of the rear end region of the exemplary embodiment of the spray-coating gun according to the invention in a partially cut-away state;
- Fig. 4 a bottom view of the rear end portion of the
- Spray coating gun in a partially cut condition
- Fig. 5 shows a detail from FIG. 4 concerning the filter element of microporous material accommodated in the through-channel of the mounting hollow body.
- 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 accommodated, 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 shaft housing 2 is formed from a plastic material, wherein the coating powder channel 11 extending in the longitudinal direction L of the shaft housing 2 through the shaft housing 2 is formed in the plastic material of the shaft housing 2.
- a separate coating material tube can be used to supply coating powder, which extends in the longitudinal direction L of the shaft housing 2 in the assembled state of the spray coating gun.
- the coating powder spray head 5 may, for example, according to the illustrations in Figures la to ld and 2b include 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 accommodated 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 fastening hollow 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 formed as a 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
- the channel 26 for coating powder formed in the axial passage opening 19 is aligned axially with the coating powder channel 11 formed in the shaft housing 2.
- 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 is used which can be inserted into the shaft housing 2 of the spray coating gun 1, then the rear end region of the coating material tube preferably becomes from the axial passage opening 19 of trained as a hollow screw mounting hollow body 18 received.
- the mounting hollow body 18 designed as a hollow screw has a thread 20, preferably an external thread and preferably at the front end portion of the mounting hollow body 18 designed as a hollow screw and serves for screwing to a complementary formed thread 21 in the shaft housing 2.
- that 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. With this clamping surface 22, 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 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 can be connected to earth 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 fastening hollow body 18 designed as a hollow screw also defines the position of the coating powder channel 26 running through the connection piece 8 relative to the connection piece 8 and thus also the position of the coating powder channel 11 formed in the shaft housing 2.
- another tubular fastening hollow body 18 can be used. to releasably secure the fitting 8 to the rear end portion 4 of the shaft housing 2.
- 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 can 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 is, for example, smaller than the circumference of the rear end region 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 mounting hollow body 18 formed as a hollow screw 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 peripheral size of the rear end portion 4 of the shaft housing 2 to the To adapt circumference shape and size of the front end portion of the connecting piece 8.
- the front end region of the connecting piece 8 is in shape and in terms of size to the rear end rich 4 of the shaft housing 2 adapted so that no transition piece is required.
- At least one compressed gas channel 9, 10 is formed through the shaft housing 2 of the exemplary embodiment of the spray-coating gun 1 according to the invention.
- two pressure gas channels 9, 10 formed in the shaft housing 2 are provided, which extend on both sides next to the coating powder channel 11 formed in the shaft housing 2.
- the rear end of each compressed gas channel 9, 10 is axially opposite the front end of each one formed in the fitting 8 compressed gas bore 28, 29.
- 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 screw 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, at 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 can be used for supplying compressed air (or another gas) for a different purpose, for example for atomizing, shaping and / or otherwise influencing the coating material stream flowing through the coating powder channel 11.
- a part of the connecting piece 8 is formed according to, for example, the illustration in FIG. 2 a as a socket 31 for receiving and fastening a cable connection body of a power cable 32.
- the socket 31 extends in longitudinal Direction L of the shaft housing 2 parallel to the passage opening 17, in which the hollow body designed as a hollow mounting member 18 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 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 that carries the high voltage from an external high voltage generator into the
- Shaft housing 2 conducts and conducts in this by 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). In this case, it is conceivable that the carrier element has a tubular fastening section which can be plugged onto the fastening section 33 of the connecting piece and forms a wobble-free plug-in seat thereon.
- 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 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 made 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 fastening portion 33 of the 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 connecting piece in the same or different embodiment as the connecting piece 8 of the spray coating gun 1 can be provided, via which the tubular carrier element can be fastened to a carrier together with the spray coating gun.
- a total of two compressed gas passages extend in the longitudinal direction L of the shaft housing 2.
- These compressed gas channels are each formed by a shaft housing 2
- Newbil- Deten compressed gas channel 9, 10 and a correspondingly formed in the connecting 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 present in a sprayable state on coating powder spray head 5 of spray coating gun 1 11 additional air can be introduced into the coating powder channel.
- the spray coating gun 1 for example, it is provided that 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 provided by an additional pressure gas bore running transversely to the longitudinal direction L of the shaft housing 2 35, 36 formed.
- 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.
- filter element 37 filter tube
- Compressed gas or compressed air can be injected from the two pressure gas bores 28, 29 formed in the connecting piece 8 via the additional Druckgasbohrept 35, 36 to flow to a compressed air ring chamber 39, which surrounds the tubular filter element 37 on its outer circumference. 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, via a Pulverweg Schl in both the circumferential direction and in the longitudinal direction of the powder path in the powder path is passed.
- 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. Due to the large surface of the tubular filter element 37 on its inner circumference, 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. As a result, pulsations of the powder flow in the powder path can be avoided or at least reduced. Furthermore, 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 connecting piece 8 should extend around the powder path defined by the coating powder channel 26 over at least 270 ° of the powder path circumference, preferably over the full 360 ° of the powder path circumference.
- 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 from behind into the axial passage opening 19 of the tubular mounting hollow body 18 designed 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 portion of the filter element 37 is fixed by the front end portion of the inserted into the axial passage opening 19 of the mounting hollow body 18 hose fitting 12.
- 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 through the additional compressed air inlet device flowing through de additional compressed air quantity depending on the pumped powder amount in at least one of the following is adjustable: for example manually adjustable is and / or preferably automatically controllable or preferably controllable.
- 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)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14701054.0A EP2978538B1 (de) | 2013-03-26 | 2014-01-21 | Sprühbeschichtungspistole zur sprühbeschichtung von gegenständen mit beschichtungspulver |
US14/779,964 US10159994B2 (en) | 2013-03-26 | 2014-01-21 | Spray-coating gun for spray coating objects with coating powder |
BR112015024202A BR112015024202A2 (pt) | 2013-03-26 | 2014-01-21 | pistola de revestimento por pulverização |
CN201480018235.1A CN105073270B (zh) | 2013-03-26 | 2014-01-21 | 用于喷涂含涂层粉末的物体的喷涂枪 |
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 |
DE102013205362.2 | 2013-03-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014154373A1 true WO2014154373A1 (de) | 2014-10-02 |
Family
ID=49999942
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2014/051115 WO2014154373A1 (de) | 2013-03-26 | 2014-01-21 | Sprühbeschichtungspistole zur sprühbeschichtung von gegenständen mit beschichtungspulver |
Country Status (7)
Country | Link |
---|---|
US (1) | US10159994B2 (de) |
EP (1) | EP2978538B1 (de) |
CN (1) | CN105073270B (de) |
BR (1) | BR112015024202A2 (de) |
DE (1) | DE102013205362A1 (de) |
TR (1) | TR201802301T4 (de) |
WO (1) | WO2014154373A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10604360B2 (en) | 2013-04-03 | 2020-03-31 | Gema Switzerland Gmbh | Dense phase powder pump and corresponding operating method |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107262320B (zh) * | 2017-06-26 | 2023-08-29 | 中信戴卡股份有限公司 | 一种混线式轮毂螺栓孔自动清粉系统及组合式清粉枪 |
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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- 2013-03-26 DE DE102013205362.2A patent/DE102013205362A1/de not_active Ceased
-
2014
- 2014-01-21 CN CN201480018235.1A patent/CN105073270B/zh active Active
- 2014-01-21 BR BR112015024202A patent/BR112015024202A2/pt not_active Application Discontinuation
- 2014-01-21 EP EP14701054.0A patent/EP2978538B1/de active Active
- 2014-01-21 TR TR2018/02301T patent/TR201802301T4/tr unknown
- 2014-01-21 US US14/779,964 patent/US10159994B2/en active Active
- 2014-01-21 WO PCT/EP2014/051115 patent/WO2014154373A1/de active Application Filing
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WO1994006516A1 (en) * | 1992-09-14 | 1994-03-31 | Roy Dennis Arthur Terry | Fire fighting method and apparatus |
DE69529497T2 (de) * | 1994-08-18 | 2003-10-09 | Nihon Parkerizing Co., Ltd. | Vorrichtung zur elektrostatischen Pulverbeschichtung |
EP1297899A1 (de) * | 2001-09-27 | 2003-04-02 | ITW Gema AG | Anschlussvorrichtung für eine Spritzbeschichtungsvorrichtung |
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Also Published As
Publication number | Publication date |
---|---|
DE102013205362A1 (de) | 2014-10-02 |
TR201802301T4 (tr) | 2018-03-21 |
EP2978538B1 (de) | 2017-11-22 |
US10159994B2 (en) | 2018-12-25 |
BR112015024202A2 (pt) | 2017-07-18 |
US20160051996A1 (en) | 2016-02-25 |
EP2978538A1 (de) | 2016-02-03 |
CN105073270A (zh) | 2015-11-18 |
CN105073270B (zh) | 2018-06-15 |
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