WO2021063652A1

WO2021063652A1 - Arc burner and wire arc spraying device

Info

Publication number: WO2021063652A1
Application number: PCT/EP2020/075507
Authority: WO
Inventors: Steffen HEIDEMANN; Christian Weinmann
Original assignee: Gebr. Heller Maschinenfabrik Gmbh
Priority date: 2019-10-02
Filing date: 2020-09-11
Publication date: 2021-04-08
Also published as: DE102019126643A1

Abstract

The invention relates to an arc burner (11) and a wire arc spraying device (10) comprising an arc burner (11). The arc burner (11) has a housing (21) comprising an outlet opening (23). The arc burner has a stationary sub-assembly (16) and a sub-assembly (17) that can rotate relative to the stationary sub-assembly (16). The stationary sub-assembly (16) defines an axis of rotation (D) for the rotatable sub-assembly (17). Provided between the stationary sub-assembly (16) and the rotatable sub-assembly (17) is a rotary bearing arrangement (20). The housing (21) and a process gas conduction device (22) form the rotatable sub-assembly (17). The process gas conduction device (22) has at least one gas channel (27, 28) and is designed to conduct a process gas (G) from at least one gas inlet (29, 30) to an atomisation region (24) which is in flow connection with the outlet opening (23). A wire guiding device (32) forms the stationary sub-assembly (16), said device being designed to guide a wire (33) from a wire inlet (34) to the atomisation region (24).

Description

Arc torch and arc wire spraying device

The invention relates to an arc torch and an arc wire spray device with an arc torch. Arc wire spraying devices are used to coat workpieces with metal, for example the coating of aluminum workpieces with a steel layer. For this purpose, the coating material is supplied in the form of a wire, melted by means of an arc, atomized by a process gas and sprayed onto the surface of the workpiece to be coated.

An arc wire spray device is known for example from DE 102015 104 492 A1. The arc wire spraying device has an arc torch and a wire feed for a wire to be melted. The arc torch and the wire guide device are arranged to be rotatable about an axis of rotation. Process gas for ejecting particles of the melted material is fed to the arc torch via a rotary feed.

EP 2941 320 B1 describes an arc wire spray device in which an arc torch rotates about an axis of rotation. In the case of the arc torch, an arc is generated between a free end of a fed wire and a cathode. In this area, wire material is melted and atomized by a process gas and expelled.

Based on the prior art, it is an object of the present invention to simplify the structure and operation of the arc torch.

This object is achieved by an arc torch with the features of claim 1 and an arc wire spray device with the features of claim 16.

The arc torch according to the invention has a housing with an outlet opening. A mixture of a process gas with coating material particles contained therein for coating a surface of a workpiece can be ejected through the outlet opening. The coating material particles are generated in an atomization area that is flow-connected to the outlet opening by melting a wire end and atomized by means of a process gas.

The arc torch has a wire guide device which is set up to guide the wire from a wire inlet to an atomization area. The arc for melting the material of the wire end is formed in the atomization area. The end of the wire can serve as an electrode and in particular as an anode. A further electrode, in particular a cathode, can be arranged in the housing of the arc torch opposite the end of the wire.

A process gas guide device of the arc torch has at least one gas duct. The process The gas guide device is set up to guide a process gas from at least one gas inlet to the atomization area. A process gas flow is generated in the atomization area, which carries the molten wire material along in the direction of the outlet opening and on to the surface to be coated.

The arc torch also has a rotary bearing assembly. The pivot bearing arrangement supports a rotatable assembly having the housing and the process gas guiding device of the arc torch rotatable relative to a stationary assembly, which has the wire guide device, about an axis of rotation. The axis of rotation is defined in particular by the stationary assembly and, for example, the wire guide device.

In this embodiment of the arc torch, the wire guide device can stand still during operation in the circumferential direction about the axis of rotation, while the rotatable assembly with the housing and the process gas guide device rotates about the axis of rotation. This significantly simplifies the feeding of the wire into the arc torch and, by means of the wire guide device, to the atomization area. Rotating the wire about the axis of rotation or twisting the wire is avoided.

It is advantageous if the pivot bearing arrangement has a plurality of pivot bearings. For example, the rotary bearing arrangement can have at least a first rotary bearing and a second rotary bearing. The pivot bearings are arranged parallel to the axis of rotation at a distance from one another. The pivot bearings can be designed as roller bearings or plain bearings. In one embodiment, the first bearing is a fixed bearing and the second bearing is a floating bearing. The position of the wire guide device relative to the housing and the process gas guide device is determined parallel to the axis of rotation via the fixed bearing. The fixed bearing can thus transmit axial forces parallel to the axis of rotation. The floating bearing is designed to transmit no or only small axial forces parallel to the axis of rotation between the wire guide device and the housing or the process gas guide device. In one embodiment, the fixed bearing can be designed as a roller or ball bearing and the floating bearing as a sliding bearing.

It is preferred if the first bearing and in particular the fixed bearing is further away from the outlet opening than the second bearing and in particular the Losla ger.

In a preferred embodiment, the wire inlet of the arc torch is arranged on the axis of rotation, so that the wire can be guided along the axis of rotation. The wire guide device can also have a wire guide tube that is connected to the wire inlet. The wire guide tube can extend parallel to the axis of rotation and preferably be arranged coaxially around the axis of rotation.

In one embodiment, the at least one gas inlet is arranged at a distance from the axis of rotation. The process gas guide device can, for example, have a primary gas inlet and a secondary gas inlet. The primary gas inlet is fluidic with a primary gas channel and the secondary gas inlet is fluidic with a secondary gas channel channel connected. The primary gas channel and the secondary gas channel open into the atomization area.

In a preferred embodiment, the primary gas duct can be arranged at a distance from the axis of rotation. In one embodiment, the secondary gas duct can be arranged directly adjacent to the wire guide device and in particular to the wire guide tube. In one embodiment, the secondary gas channel can be designed as an annular space around the wire guide tube. As a result, the secondary gas duct requires little installation space.

The primary gas channel preferably opens into the atomization region on the side opposite the outlet opening with respect to the axis of rotation.

The cross-sections of the primary gas channel and the secondary gas channel are dimensioned sufficiently large in order to minimize the susceptibility to pressure fluctuations. The cross section of the primary gas channel is preferably larger than the cross section of the secondary gas channel. The cross section of the primary gas channel can be approximately 90-100 mm ² and in particular approximately 95 mm ² . The cross section of the secondary gas channel can be approximately 80-90 mm ² and in particular approximately 76 mm ² .

By separating the primary gas channel and the secondary gas channel, the volume flow of the process gas can be set independently.

The arc torch can have a securing element that can be moved between a securing position and a release position. In the securing position, the securing element prevents the Wire guide device relative to the housing or the process gas guide device. The securing element can, for example, intervene in a recess to block the relative rotational movement. The securing element can, for example, be connected to the housing and the process gas guide device in a rotationally test manner and the recess in a rotationally test manner to the wire guide device, or vice versa. In the securing position, a defined relative rotational position is maintained. This is advantageous, for example, when the arc torch and in particular the wire guide device and its components are not rotationally symmetrical. In the release position, a Drehbewe movement of the housing and the gas guide device relative to the wire guide device of the arc torch around the axis of rotation is made possible. For example, the safety element is in the release position outside of the recess.

At least one pretensioning element is preferably present which urges the securing element into the securing position. The at least one prestressing element can for example be at least one resilient element, for example a spring, in particular a helical spring.

In one embodiment, the securing element can be moved parallel to the axis of rotation between the securing position and the release position. The fuse element can be designed to interact with an element on a machine assembly of the arc wire spraying device so that the fuse element is held in its release position when the connection between the arc torch and the machine assembly is established. This is a twist of the housing and the process gas guiding device around the axis of rotation when operating the arc wire spray device.

In a preferred embodiment, the arc torch has a torch coupling unit which is set up to establish a mechanical connection with a machine coupling unit of the machine assembly of the arc wire spraying device. The burner coupling unit can have a burner coupling part rotatable about the axis of rotation. In addition, the burner coupling unit can have a burner coupling part which cannot be rotated about the axis of rotation and which is referred to as a stationary burner coupling part. The torch coupling unit serves, so to speak, as an interface between the arc torch and the machine assembly of the arc wire spray device.

The wire guide device is preferably connected to the stationary torch coupling part. The process gas guide device and the housing are in particular connected to the rotatable burner coupling part.

In an advantageous embodiment, the stationary assembly and the stationary burner coupling part are arranged on the axis of rotation. The axis of rotation penetrates the stationary burner coupling part. The rotatable assembly and the rotatable burner coupling part can be arranged coaxially and at a distance from the axis of rotation.

It is advantageous if the machine coupling unit has a locking element. The locking element is set up with a counter locking working together gelungselement on the torch coupling unit. When the connection between the machine coupling unit and the torch coupling unit is established, a non-rotatable coupling can be established between the stationary torch coupling part and a stationary machine coupling part of the machine coupling unit. In this way, it can be prevented that the stationary components of the arc torch inadvertently rotate with the rotatable components of the arc torch, for example due to friction in the pivot bearing arrangement.

There can be a pair or several pairs of a locking element and a counter-locking element. Each locking element can establish a positive and / or non-positive connection with the counter-locking element of the same pair. The counter-locking element can for example be gebil det by egg ne axially open recess in the direction of the axis of rotation, in which an axially extending projection of the locking element can engage, or vice versa. A so-called "Hirth toothing" or another axially acting toothing can also be used.

The arc torch preferably has a first electrical connection and a second electrical connection. A voltage can be applied to electrodes in the flow area for arcing via the electrical connections. One electrode is preferably arranged through the end of the wire and the other electrode is arranged on the housing of the arc torch.

The first electrical connection can be at a advantageous embodiment can be arranged on the wire inlet or formed by the wire inlet. It is advantageous if the first electrical connection is electrically connected to the wire guide tube. The wire can be connected to the first connection via the wire guide tube, for example via a contact device. When arcing occurs, the end of the wire is preferably used as an anode.

An electrode, preferably a cathode, arranged in the sputtering area can be electrically connected via the second electrical connection.

The total ohmic resistance between the second electrical connection and the cathode is preferably sufficiently small to limit the voltage drop between an external voltage and current source and the cathode. The ohmic resistance between the second electrical connection and the cathode can be less than 115 mW at 20 ° C and / or less than 130 mW at 50 ° C. The total resistance of the electrical circuit from the voltage or current source to the cathode and from the voltage or current source to the anode is preferably so small that the total voltage drop is limited to less than 3% of the voltage amount and in particular to about 1% of the voltage amount . This corresponds to a maximum voltage drop of 350 mV at a nominal voltage of 35 V. The amount of the nominal current through the electrical circuit can be around 300 A in the event of an arcing. This results in an ohmic resistance for the entire electrical circuit of around 1.17 piW without taking the arc into account. [0032] An electric arc according to the invention

Wire spraying device has an arc torch according to one of the exemplary embodiments described above. The wire arc spray device has a wire feed device and a gas feed device. The wire feed device is set up to feed the wire to the wire inlet of the arc torch. The gas supply device is set up to convey the process gas to the at least one gas inlet of the arc burner.

Advantageous embodiments of the invention emerge from the dependent claims, the description and the drawings. Preferred Ausfüh approximately examples of the invention with reference to the accompanying drawings are explained in detail. Show it:

FIG. 1 shows a schematic representation, similar to a block diagram, of an exemplary embodiment of an arc wire spray device with a machine assembly and an arc torch extending along an axis of rotation,

FIG. 2 shows a schematic representation, similar to a block diagram, of a coupling device having a machine coupling unit of the machine assembly from FIG. 1 and a torch coupling unit of the arc torch from FIG. 1,

Figure 3 is a schematic, block diagram-like representation of the management and line of coolant, process gas, electricity and wire in the arc torch, FIG. 4 shows a plan view of an exemplary embodiment of a burner coupling unit with a view along the axis of rotation,

FIG. 5 shows a perspective illustration of the burner coupling unit from FIG. 4,

Figures 6 and 7 each a schematic side view of an arc torch with an exemplary embodiment of a wire guide device,

FIG. 8 shows a partial illustration of an exemplary embodiment of an arc burner to illustrate the current conduction to a cathode of the arc burner,

FIG. 9 shows an exemplary embodiment of a process gas guide device for the arc burner and

Figure 10 is a schematic side view of an embodiment of an arc burner in a longitudinal section along the axis of rotation.

In FIG. 1, a block diagram of an exemplary embodiment of an arc wire spraying device 10 is illustrated. The arc wire spraying device 10 has an arc torch 11, which is the actual coating tool Be, and a Maschinenbaugrup pe 12 to which the arc torch 11 can be releasably attached. To releasably connect the arc torch 11 to the machine assembly 12, a Kopplungsein device 13 is used as an interface. The coupling device 13 includes a machine coupling unit 14 of the machine assembly 12 and a torch coupling unit 15 of the light arc burner 11. The machine coupling unit 14 has a machine coupling part 14d which can be rotated about an axis of rotation D and a machine coupling part which is not rotatable about the axis of rotation D and which is referred to as a stationary machine coupling part 14s. Analogously to this, the burner coupling unit 15 has a burner coupling part 15d which can be rotated about the axis of rotation D and a stationary burner coupling part 15s which cannot be rotated about the axis of rotation D (FIG. 2).

The arc torch 11 has a stationary assembly 16, which is stationary in the circumferential direction about the axis of rotation D when the arc torch 11 is in operation, and a rotatable assembly 17 which rotates or can rotate about the axis of rotation D in the circumferential direction when the arc burner 11 is in operation . The stationary assembly 16 is arranged along and preferably substantially coaxially to the axis of rotation D is. The rotatable assembly 17 encloses the stationary assembly 16.

The stationary assembly 16 is connected to the stationary torch coupling part 15s, while the rotatable assembly 17 is connected to the rotatable torch coupling part 15d.

The stationary torch coupling part 15s and the stationary machine coupling part 14s are set up to be detachably connected to one another. Analogously to this, the rotatable torch coupling part 15d and the rotatable machine coupling part 14d are designed to be detachably connected to one another. It should be pointed out at this point that the representation in FIG. 2 is a highly schematic block diagram and is only used to illustrate the components of the coupling device 13 and 13 serves to explain the principle, but does not reflect the actual spatial arrangement.

A pivot bearing arrangement can be present on the machine coupling unit 14 in order to enable the relative rotation between the stationary machine coupling part 14s and the rotatable machine coupling part 14d.

The arc torch 11 has a pivot bearing arrangement 20 which is arranged between the stationary assembly 16 and the rotatable assembly 17 in order to enable relative rotation about the axis of rotation D. The rotary bearing arrangement 20 of the arc torch 11 can have a plurality of rotary bearings and has at least two and, in accordance with the game, exactly two rotary bearings, namely a first rotary bearing 20a and a second rotary bearing 20b. The two rotary bearings 20a, 20b are arranged in the direction of the axis of rotation D with an axial spacing from one another. According to the example, the first pivot bearing 20a is arranged adjacent to or on the burner coupling unit 15.

The first pivot bearing 20a is designed as a fixed bearing and can thus also absorb axial forces between the stationary assembly 16 and the rotatable assembly 17. According to the example, the second pivot bearing 20b is designed as a Losla ger and transfers no or only negligibly small axial forces between the stationary construction group 16 and the rotatable assembly 17 of the arc burner 11. The first pivot bearing 20a can be used as a roller bearing and the second pivot bearing 20b can be used as a plain bearing be trained. Other bearing combinations of roller and / or slide bearings are also possible. The rotatable assembly 17 of the arc burner 11 has a housing 21 and a process gas guide device 22 (FIG. 9). The housing 21 has an outlet opening 23 at which an atomization area 24 of the arc burner 11 opens. A process gas flow of a process gas G can be ejected through the outlet opening 23, which entrains particles of a coating material and ejects them onto a surface 25 of a workpiece 26 to be coated (FIG. 1).

The process gas guide device 22 is connected to the housing 21. The process gas guide device 22 has at least one gas channel and, in the exemplary embodiment, a primary gas channel 27 and a secondary gas channel 28.

The primary gas channel 27 is arranged at a distance from the axis of rotation D and runs essentially parallel to the axis of rotation D. It opens on the side opposite the outlet opening 23 with respect to the axis of rotation D into the atomization area 24 The atomization region 24 flows, generating a process gas flow flowing in the direction of the outlet opening 23. On the burner coupling unit 15 there is a primary gas inlet 29 which is fluidically connected to the primary gas channel 27. As a result, process gas can be supplied to the primary gas channel 27.

The secondary gas duct 28 also carries process gas G. Process gas G can be fed to the secondary gas duct 28 via a secondary gas inlet 30 on the burner coupling unit 15. The secondary gas channel 28 is formed, for example, by an annular space between the stationary assembly 16 and the rotatable assembly 17. Since the annular space is adjacent through the first pivot bearing 20a or on the coupling unit 15 is blocked, the secondary gas duct 28 is connected to the secondary gas inlet 30 on the burner coupling unit 15 via a branch duct 31 running obliquely to the axis of rotation D. In the area of the second rotary bearing 20b, groove-shaped axial recesses 18 and / or fluid channel connections in the rotatable assembly 17 can be present in order to fluidically connect the axial annular space parts of the annular space, which are separated from one another by the second rotary bearing 20b. Such groove-shaped axial recesses 18 are shown by way of example in FIGS. 3, 6 and 7

In the exemplary embodiment, both the primary gas inlet 29 and the secondary gas inlet 30 are arranged on the rotatable burner coupling part 15d. In FIG. 7, the process gas guide device 22 is shown in a highly schematic manner. In the view according to FIG. 7, the primary gas inlet 29 and the secondary gas inlet 30 are shown one behind the other in the image plane.

Nitrogen, for example, can be used as the process gas G.

The stationary assembly 16 extends, according to the game, along the axis of rotation D and has a wire guide device 32. The wire guide device 32 is set up to guide a wire 33 from a wire inlet 34 to the atomization area 24. For this purpose, a wire guide tube 35 extends between the wire inlet 34 and the atomization area 24. The wire guide tube 35 carries the first rotary bearing 20a and the second rotary bearing 20b on its outer circumference. It extends, for example, coaxially to the axis of rotation D. Radially inward With respect to the axis of rotation D, the wire guide tube 35 delimits the secondary gas duct 28.

The wire guide tube 35 is open on the side opposite the wire inlet 34 and opens into the atomization area 24. A wire end 36 of the wire 33 is arranged in the atomization area 24. The wire end 36 is opposite in the direction of the axis of rotation D at an axial distance from an electrode which is formed by a cathode 37 in the embodiment. An anode 38 is formed by the wire end 36.

The arc burner 11 has a first electrical connection 45 for connection to the anode 38 and a second electrical connection 46 for connection to the cathode 37. The first electrical connection 45 is formed by the wire inlet 34 in the exemplary embodiment. The wire inlet 34 is produced, for example, as a hollow cylindrical socket or hollow body made of electrically conductive material. The wire inlet 34 or the first electrical connection 45 formed thereby is electrically connected to the wire guide tube 35 which, according to the example, is designed to be electrically conductive. In Figure 2, this electrical connection is shown schematically by a dashed line.

As shown schematically in Figures 3, 6 and 7, a contact device 47 is preferably arranged at the lower end of the wire guide tube 35. The contact device 47 is set up to produce an electrical connection to the wire 33 in order to apply a voltage potential to the wire end 36 of the wire 33. Thus, there is an electrical connection between the first electrical connection 45 and the wire end 36. The connection is established indirectly via the wire guide tube and the contact device 47.

In order to connect the cathode 37 to the second electrical connection 46, the rotatable assembly 17 has one or more and, in the exemplary embodiment, two current conduction paths 49, of which one current conduction path 49 is shown as an example in FIG. In the exemplary embodiment, the second electrical connection 46 is formed by a connection pin 50. Starting from the connection pin 50, each current path 49 has a busbar 51 which is electrically connected to the connection pin 50 at one end by means of a first contact bar 52 and to the housing 21 at the other end by means of a second contact bar 53. The housing 21 is electrically conductive. In the housing 21 sits a holder 54 in which the cathode 37 is arranged. An electrical connection to the current path 49 or the current paths 49 and thus to the second electrical connection 46 is established via the holder 54 and the housing 21. By connecting several current paths 49 or several busbars 51 in parallel, the electrical resistance between the second connection 46 and the cathode 37 can be reduced.

To form an arc, a voltage U is applied across the machine assembly 12 between the first electrical connection 45 and the second electrical connection 46, so that an arc is created between the anode 38 forming the wire end 36 and the cathode 37 and wire material in the atomization area 24 is melted. Particles of the molten wire material are carried along by the process gas flow and via the outlet opening 23 sprayed onto the surface 25 to be coated.

The rotatable assembly 17 has a cooling circuit for cooling the cathode 37. For this purpose, two coolant connections 59 are present on the burner coupling unit 15 and, for example, on the rotatable burner coupling part 15d. Each coolant connection 59 is fluidically connected to a coolant pipe 60. The coolant tubes 60 extend essentially parallel to the axis of rotation D inside the rotatable assembly 17. The coolant tubes 60 are in fluidic connection with at least one cooling channel 61, so that a coolant K, which flows through the at least one cooling channel 61, reaches the cathode 37 cools. The coolant K can be supplied via one of the coolant connections 59 and discharged via the respective other coolant connection 59.

As shown in Figures 4 and 5, the torch coupling unit 15 has a fastening means for non-positive and / or positive fastening to the machine coupling unit 14. In the embodiment, a hollow cylindrical fastening part 62 is provided.

In the interior of the fastening part 62, the described enclosed connections 29, 30, 34, 45, 46, 59 of the burner coupling unit 15 can be arranged. The fastening part 62 can be held in a releasable clamping manner on the machine coupling unit 14. A coding means 63 can be provided on the fastening part 62 in order to specify the rotational position with respect to the machine coupling unit 14. For example, the coding means 63 can be a projection and / or a recess in the fastening part 62 in order to give it a non-rotationally symmetrical shape. Referring to FIG. 2, the machine coupling unit 14 has a wire outlet 66 for coupling to the wire inlet 34. The wire 33 can be fed to the wire outlet 66 from a wire feed device 67 of the machine assembly group 12.

The machine coupling unit 14 also has a primary gas outlet 68 for fluid connection with the primary gas inlet 29 and a secondary gas outlet 69 for fluid connection with the secondary gas inlet 30. Process gas G can be supplied to the primary gas outlet 68 and the secondary gas outlet 69 by means of a gas supply device 70.

In addition, the machine coupling unit 14 has two coolant counter-connections 71, which are set up for connection to the coolant connections 59. A coolant K can be fed to the coolant counter-connections 71 via a coolant feed device 72 of the machine assembly 12.

In the exemplary embodiment, the wire outlet 66 also serves as the first mating contact 73 for the first electrical connection 45. When a mechanical connection is established between the wire inlet 34 and the wire outlet 66, an electrical contact is made between the first electrical connection 45 and the first mating contact 73 made. Since the wire outlet 66 is arranged on the stationary machine coupling part 14s, sliding contacts can be dispensed with when making electrical contact.

The second electrical connection 46 of the burner In the coupling unit 15, an electrical second mating contact 74 is arranged on the machine coupling unit 14. In the exemplary embodiment, the second mating contact 74 is designed as a socket into which the connection pin 50, which in the case of the game forms the second electrical connection 46, can engage to establish the electrical connection.

In the exemplary embodiment, the primary gas outlet 68, the secondary gas outlet 69, the coolant mating connections 71 and the second mating contact 74 are located on the rotatably mounted machine coupling part 14d.

For the supply of coolant K and process gas G, the machine coupling unit 14 is fluidically connected to the gas supply device 70 and the coolant supply device 72 via a rotary distributor 75. The rotary distributor 75 can, for example, have two relatively rotatable coaxially arranged bodies, between which a plurality of annular channels are formed and are fluidically sealed from one another. One body is connected to the rotatable machine coupling part 14d, while the other body is fluidly connected to the feed devices 70, 72.

In order to make electrical contact with the second mating contact 74, a slip ring 76, on which a slip contact 77 rests, can be arranged on the rotatable machine coupling part 14d.

The first mating contact 73 is connected to a first voltage supply connection 78 and the second mating contact 74 is connected, for example, to a second voltage supply connection via the slip ring 76 and the sliding contact 77. circuit 79 electrically connected. A voltage U is applied to the voltage supply connections 78, 79, the higher voltage potential in the exemplary embodiment being applied to the first voltage supply connection 78 so that the wire 33 or the wire end 36 serves as the anode 38 (FIG. 3).

In the exemplary embodiment, a locking element 85 is present on the stationary machine coupling part 14s. The locking element 85 is a Gegenverriege treatment element 86 on the stationary burner coupling part 15s is assigned, which is ge by a recess 87 forms according to the example. The recess 87 can be formed by a recess in a ring 88. The ring 88 is arranged coaxially to the axis of rotation D and, for example, encloses the wire inlet 34. The recess 87 is parallel to the axis of rotation D on the side facing the machine coupling unit 14 and, for example, also radially outwardly away from the axis of rotation D.

When the mechanical connection is established between the torch coupling unit 15 and the machine coupling unit 14, the locking element 85 engages in the recess 87 and provides a rotationally fixed connection between the stationary torch coupling part 15s and the stationary machine coupling part 14s. As a result, inadvertent rotation of the stationary burner coupling part 15s and consequently the stationary assembly 16 when the rotatable assembly 17 is rotated about the axis of rotation D is avoided.

If there is no mechanical connection between the torch coupling unit 15 and the machine coupling unit unit 14 is established, there is the possibility that the stationary assembly 16 and the rotatable assembly 17 rotate relative to each other. In the exemplary embodiment, such a relative rotation is prevented by a securing element 89. The securing element 89 can be moved between a securing position S and a release position F. The securing position S is illustrated by solid lines in FIG. 2 and in FIG. The release position F is shown in dashed lines in FIG. 2 and in FIG.

According to the example, the movement takes place between the securing position S and the release position F or vice versa by moving the securing element 89 parallel to the axis of rotation D. In the securing position S, the securing element 89 engages in the recess 87. The securing element 89 thus uses the recess 87, which is already present as a counter-locking element 86 for the locking element 85.

In the exemplary embodiment, the securing element 89 is arranged on the rotatable burner coupling part 15d, while the ring 88 with the recess 87 is arranged on the stationary burner coupling part 15s. As a result, a non-rotatable coupling between the rotatable torch coupling part 15d and the stationary torch coupling part 15s and thus between the rotatable assembly 17 and the stationary assembly 16 of the arc torch 11 can be established when the securing element 89 is in the securing position S.

In the illustrated embodiment, the securing element 89 is secured by means of at least one prestressing elements 90 pushed into the locking position S. The at least one biasing element 90 can be formed, for example, by a spring. Against the force of the biasing element 90, the securing element 89 can be moved or shifted into the release position F.

The displacement of the securing element 89 from the securing position S into the release position F takes place in the exemplary embodiment during the establishment of the mechanical connection between the torch coupling unit 15 and the machine coupling unit 14. The securing element 89 comes into contact with the locking element 85. The locking element 85 pushes the securing element 89 out of the recess 87 of the ring 88 and engages in the recess 87 itself. Then a relative rotation of the rotatable torch coupling part 15d and the rotatable assembly 17 about the axis of rotation D and relative to the stationary assembly 16 is enabled, while a rotationally fixed coupling between the stationary assembly 16 via the stationary torch coupling part 15s with the stationary machine coupling part 14s is established.

Returning again to FIG. 1, the machine assembly 12 also includes a motor 91 which, for example, is drive-connected to the rotatable machine coupling part 14d by means of a drive belt 92. If the motor 91 is driven, the rotatable machine coupling part 14d rotates about the axis of rotation D. The stationary machine coupling part 14s is rotatably arranged about the axis of rotation D. When the connection between the machine coupling unit 14 and the torch coupling unit 15 is established, the rotatable torch coupling part 15d and the rotatable assembly 17 together with the rotatable machine Coupling part 14d driven about the axis of rotation D when the motor 91 is operated.

During operation of the wire arc sprayer 10, the motor 91 is operated.

When the voltage U is applied, an arc arises between the anode 38 and the cathode 37, whereby wire material in the atomization area 24 is melted. Process gas G flows through the primary gas channel 27 into the atomization region 24 and thereby carries melted material particles of the wire 33 with it through the outlet opening 23 to the outside onto the surface 25 to be coated.

The process gas flow from the primary gas channel 27 atomizes the molten material in the atomization area 24, in which the arc is also formed. The process gas flow from the secondary gas channel 28 ensures a bundling of the ejected mixture of molten particles and process gas G. The fluidic separation of the process gas G into two separate flows allows the volume flows to be set or regulated separately.

During the melting and ejection of particles for coating the surface 25 to be coated, the motor 91 is operated so that the rotatable assembly 17 rotates about the axis of rotation D and the direction of ejection about the axis of rotation D is changed in the process. At the same time, a relative movement of the arc torch 11 relative to the workpiece 26 can be caused, for example by moving it along the axis of rotation D of the arc torch 11 and / or the workpiece 26. As a result, the surface 25 to be coated can be completely coated by a kind of screw movement . The invention relates to an arc torch 11 and an arc wire spraying device 10 with an arc torch 11. The arc torch 11 has a housing 21 with an outlet opening 23. It has a stationary assembly 16 and an assembly that can be rotated relative to the stationary assembly 16 17 on. The stationary construction group 16 defines an axis of rotation D for the rotatable construction group 17. Between the stationary assembly 16 and the rotatable assembly 17, a pivot bearing arrangement 20 is present. The rotatable assembly 17 includes the housing 21 and a process gas guide device 22. The process gas guide device 22 has at least one gas channel 27, 28 and is set up to guide a process gas G from at least one gas inlet 29, 30 to an atomization area 24, which is connected to the outlet opening 23 is in flow communication. The stationary assembly 16 includes a wire guide device 32 which is set up to guide a wire 33 from a wire inlet 34 to the atomization area 24.

List of reference symbols:

10 Wire arc spraying device

11 arc torch

12 machine assembly

13 Coupling device

14 Machine coupling unit

14d rotatable machine coupling part 14s stationary machine coupling part

15 Torch coupling unit

15d rotatable torch coupling part 15s stationary torch coupling part

16 stationary assembly

17 rotating assembly

18 groove-shaped axial recess

19 Pivot bearing arrangement of the machine coupling unit

20 pivot bearing arrangement of the torch coupling unit 20a first pivot bearing

20b second pivot bearing

21 housing

22 Process gas control device

23 outlet opening

24 Atomization Area

25 surface to be coated

26 workpiece

27 primary gas duct

28 secondary gas duct

29 Primary gas inlet

30 secondary gas inlet

31 branch duct

32 wire guide device

33 wire Wire inlet

Wire guide tube 6 wire end

Cathode 8 Anode first electrical connection6 second electrical connection7 contact device 9 current conducting path 0 connection pin 1 busbar 2 first contact bar 3 second contact bar 4 socket 9 coolant connection 0 coolant tube 1 cooling channel 2 fastening part 3 coding means 6 wire outlet 7 wire feed device 8 primary gas outlet 9 secondary gas outlet 0 gas feed device 1 coolant counter connection 2 coolant supply 3 first mating contact 4 second mating contact 75 rotary distributors

76 slip ring

77 sliding contact

78 first power supply connection

79 second power supply connection

85 locking element

86 Counter locking element

87 recess

88 ring

89 security trainee

90 preload element

91 engine

92 Drive Belt

D axis of rotation

F Release position

G process gas

K coolant

S safety position

U voltage

Claims

Patent claims:

1. Arc torch (11) having:

- A rotatable assembly (17) comprising a process gas guide device (22) and a housing (21) with an outlet opening (23), the process gas guide device (22) having at least one gas channel (27, 28) and being configured to carry a process gas (G) from at least one gas inlet (29, 30) to the atomizing area (24) which is in flow connection with the outlet opening (23),

- A stationary assembly (16) comprising a wire guide device (32) which is set up to guide a wire (33) from a wire inlet (34) to an atomization area (24),

- A pivot bearing arrangement (20) which is set up to support the rotatable assembly (17) so as to be rotatable relative to the stationary assembly (16) about an axis of rotation (D).

2. Arc torch according to claim 1, characterized in that the pivot bearing arrangement (20) has a first pivot bearing (20a) and a second Drehla ger (20b) which are arranged parallel to the axis of rotation (D) at a distance.

3. Arc torch according to claim 2, characterized in that the first pivot bearing (20a) is a fixed bearing and the second pivot bearing (20b) is a Losla ger.

4. Arc torch according to claim 2 or 3, characterized in that the first bearing (20a) is further away from the outlet opening (23) than the second bearing (20b).

5. Arc torch according to one of the preceding Ansprü surface, characterized in that the stationary assembly (16) is arranged on the axis of rotation (D).

6. Arc torch according to one of the preceding Ansprü surface, characterized in that the rotatable assembly pe (17) is arranged coaxially and at a distance from the axis of rotation (D).

7. Arc torch according to one of the preceding Ansprü surface, characterized in that the wire inlet (34) is arranged on the axis of rotation (D).

8. Arc torch according to one of the preceding claims, characterized in that the wire guide device (32) has a wire guide tube (35) which is connected to the wire inlet (34).

9. Arc torch according to claim 8, characterized in that the wire guide tube (35) extends parallel to the axis of rotation (D).

10. Arc torch according to claim 8 or 9, characterized in that the wire guide tube (35) extends coaxially to the axis of rotation (D).

11. Arc torch according to one of the preceding claims, characterized in that the at least one gas inlet (29, 30) is arranged at a distance from the axis of rotation (D).

12. Arc burner according to one of the preceding claims, characterized in that the Prozessgasleiteinrich device (22) has a primary gas inlet (29) and a primary gas duct (27) fluidly connected to the primary gas inlet (29) and that the Prozessgasleitein device (22 ) has a secondary gas inlet (30) and a secondary gas channel (28) fluidly connected to the secondary gas inlet (30).

13. Arc torch according to one of the preceding claims, characterized in that the arc torch (11) has a torch coupling unit (15) which has a stationary torch coupling part (15s) and a torch coupling part (15d) rotatable about an axis of rotation (D), wherein the torch coupling unit (15) is set up to be mechanically connected to a machine coupling unit (14) of the arc wire spraying device (10).

14. Arc torch according to claim 13, characterized in that the stationary assembly (16) is connected to the stationary torch coupling part (15s).

15. Arc torch according to claim 13 or 14, characterized in that the rotatable assembly (17) with the rotatable torch coupling part (15d) is connected ver.

16. Arc wire spraying device (10) having:

- An arc torch (11) according to one of the preceding claims,

- A machine coupling unit (14) which is set up to establish a mechanical connection with the burner coupling unit (15),

- a wire feed device (67) which is set up to feed a wire (33) to a wire outlet (66) on the machine coupling unit (14),

- A gas supply device (70) which is set up for supplying a process gas (G) to at least one gas outlet (68, 69) on the machine coupling unit (14).