EP2994238B1 - Coating apparatus for thermal coating - Google Patents

Description

The invention relates to a coating device for thermal coating, with a coating device and with a material feed device, wherein the coating device comprises a spray gun and a spray gun holder, wherein the spray gun is connected to the spray gun holder, the spray gun functionally effective by means of at least one drive means when coating around an axis is rotatable and / or movable in the axial direction, wherein the spray gun, a coating material can be applied to an inner surface of a hollow workpiece.

Thermal coating includes methods in which a coating material is applied, melted or melted inside or outside a spray gun and spin-coated onto a prepared workpiece surface. Thermal coating includes, but is not limited to, the following main processes: plasma spraying, high velocity flame spraying, powder flame spraying, wire flame spraying, electric arc wire spraying, laser spraying, detonation spraying, cold gas spraying.

From the DE 102 04 251 A1 is a coating device for thermal coating, namely for arc wire spraying of holes known. The coating device has a coating device and a wire feed device. The coating device has a spray gun in the form of a hollow cylindrical base body. The main body also forms part of the wire feed device. The spray gun is rotatably mounted on a spray gun mount. The wire feed device and the spray gun device form a rigid, rotatable structural unit. For the rotation of the spray gun, a stationary drive means, namely a drive motor is provided. The spray gun mount is disposed on another device to position the spray gun mount in the axial direction. The wire feed device has two wire supply rolls, wherein the wire supply rolls are rotatably arranged on axes on the base body. On the wire supply rolls spray wires are rolled up. The Spray gun has a nozzle head at one end. The nozzle head is designed so cranked, so that an outlet opening is directed substantially in the radial direction. The spray wires enter from the nozzle head in a Abschmelzbereich. The outlet port communicates with gas ducts that terminate at rotary unions. The rotary unions are arranged on the circumference of the base body. To power the spray wires slip rings are attached to the circumference of the base body, wherein exist in the interior of the body between the slip rings and the spray wires connections. When advancing the spray wires in the Abschmelzbereich arises between the approaching wires an arc. The ends of the spray wires are melted in the arc. The molten metal particles are thrown by the gas flow on the prepared inner peripheral surface of a hole. Characterized in that the base body is rotated with the coating device and the wire feed device and at the same time a movement into the bore is carried out in the axial direction, the entire inner peripheral surface of the bore is covered by the spray jet. This coating device has the disadvantage that only holes with a small diameter can be coated. The coating device is not suitable for coating workpieces with a large inner diameter. The coating device is also unwieldy.

From the generic DE 198 41 617 A1 For example, a coating apparatus for thermal coating by means of arc wire spraying of inner walls of hollow bodies is known. There is provided a coating device and a material feed device. The coating device has a spray gun in the form of a burner shaft. The burner shaft has at its one end an internal burner with a burner head. At the other end a material supply device is rigidly attached with two wire reels. The wound on the wire reels sprayer is fed according to the consumption of the burner shaft. The internal burner is inserted interchangeably in the burner shaft. Two spray wires are brought together at the burner head, whereby an arc can be ignited between the two spray wires. The burner head further comprises a compressed air nozzle which is directed radially to the longitudinal axis of the burner shaft.

The coating device is rotatably mounted on a spray gun holder in the form of a holding block. The drive of the burner shaft by means of an integrated motor in the holding block, the motor drives a belt. The holding block can be arranged on a robot arm. The endless belt is wrapped around the burner shaft. The burner head is replaceable to adapt the coating apparatus to workpieces having different bore diameters. There are on the one hand workpieces in the form of a commercial vehicle connecting rod or cylinder bores of cars with a diameter of 75 to 100 mm coatable. On the other hand, workpieces with a bore diameter of 45 to 75 mm can be coated, such as commercial vehicle synchronizer rings and car connecting rods.

This generic coating device is not yet optimally formed. In order to coat holes with different diameters, the burner head must be exchanged. There are only workpieces with holes coated, if the bore diameter is 100 mm or less. A robotic arm is necessary to move the coater axially within the bore. Although this makes it possible to use the coating apparatus in a stationary manner, the coating apparatus is in particular not easy to transport and thus can be used for mobile use. This is expensive, especially if only single larger workpieces to be coated. The workpieces must therefore be removed and transported to the coating device. Workpieces with a large diameter, for example. A diameter of 150 mm to 1500 mm are often only cumbersome to remove and difficult to transport. Bearing seats of wind turbines can not be coated, for example, with the existing coating devices in the mounted state on the wind turbine.

From the DE 38 00 448 A1 is a method for continuous coating of workpieces, namely metal can bodies, known with a plastic coating plant. The can bodies are first welded to a welding machine. Subsequent to the welding system, a powder plastic coating arrangement is attached terminally to a welding arm. The can body become. The powder plastic coating arrangement has a plurality of nozzle assemblies, wherein powder plastic supply lines are provided and a plastic powder is discharged through the powder plastic supply lines. A longitudinal weld formed during welding is coated by the plastic jet during the passage of the can body. A distance L between the welding point P and the impact area of the plastic jet can be changed by linearly displacing and pivoting the nozzle assembly. During coating, the spray gun is not moved, but the workpieces, namely the can bodies are moved over the welding arm.

From the US 4,065,059 A is a spray device for repairing the walls of a coke oven known. This spray device comprises a base frame and a carriage, wherein the base frame stationary relative to the coke oven, wherein the carriage is movable on a guide rail to reach with a sight tube, the interior of the coke oven. The sight tube is pivotally mounted up and down on the carriage to reach repair points at different heights in the coke oven can. The sight tube comprises a material supply line, wherein the material supply line opens radially laterally into an outlet nozzle. The sight tube is rotatable about its longitudinal axis and has at its free end laterally a window. Within the sight tube, a mirror is arranged in front of the window in order to be able to examine the walls of the coke oven through the sight tube accordingly. The outlet nozzle is arranged at the end of the window. The spray device is not designed to coat the entire inner surface of the coke oven by rotation and axial displacement, but only individual points to be repaired. Since the sight tube is rotatable only about its longitudinal axis, the radial position of the outlet nozzle is predetermined to the axis of rotation by the tube diameter.

The invention is therefore based on the object to design the generic coating device such and further, so that hollow workpieces with different inner diameter can be coated.

This object of the invention is based solved by that the spray gun holder is adjustable, the spray gun holder having a pivotable arm, wherein the spray gun is disposed on the arm, wherein the radial positioning of the spray gun is adjustable to the axis by pivoting the arm, wherein the Spray gun holder having a base frame and a carriage, wherein the base frame is stationary relative to the workpiece can be arranged, wherein the base frame has a guide rail, wherein the carriage is arranged to be movable on the guide rail. This has the advantage that workpieces with different diameters can be coated. The radial displacement of the spray gun holder is in particular more than 100 mm, preferably more than 200 mm, more preferably more than 300 mm. The coating device can be adjusted and adapted individually to different workpieces. In particular, the coating apparatus is mobile, so that the workpieces - such as. Bearing seats of wind turbines - do not need to be removed, but a coating can be done on site at the customer. The scope of application of the coating device is expanded.

The spray gun mount has a pivotable arm with the spray gun disposed on the arm. The arm can be swiveled with the spray gun. The radial positioning of the spray gun is adjustable by pivoting the arm. The angular position of the spray gun relative to the inner peripheral surface is preferably adjustable. Before coating, the spray gun holder is centered so that a rotation about a (center) axis can be carried out with the spray gun. This center axis corresponds to the centering of the axis of symmetry of the workpiece. The radial positioning of the spray gun relative to the center axis is done by pivoting the arm. During rotation, the spray gun performs a rotational movement with the set radial distance to the center axis.

The arm may have at least two arm parts and at least two joints, wherein the arm parts are connected to each other via at least one of the joints and are connected via at least one other joint with the arm holder. The radial positioning and the angular position of the spray gun are adjustable by pivoting the arm parts. The arm may alternatively be formed as a parallel arm, wherein the angular position of the spray gun is not changed during pivoting.

The spray gun is axially movable during coating and / or rotatable. The drive for the axial feed and / or the rotation can be done electrically, in particular by electric motor or pneumatically. Preferably, the coating is applied by rotation of the spray gun. Depending on the depth of the workpiece, the spray gun can be moved axially, so that the entire inner peripheral surface is coated. The spray gun can perform a helical movement during coating.

It is conceivable that the spray gun alternatively performs a clocked feed into the bore, i. is dipped into the hole and pulled out again and then rotated by an angular step and then immersed again. This could be repeated until the entire inner circumferential surface is coated.

It is conceivable that the spray gun is extendable with an extension part. The extension part may have a length of, for example, 300 to 1000 mm. Now, if the spray gun is equipped with the corresponding extension part, this allows a particularly deep penetration into workpieces with a small inner diameter. The extension part can have an outlet opening, in particular at an angle of approximately 70 ° to its longitudinal direction, so that the extension part can be inserted axially into the cavity of the workpiece for coating.

The spray gun holder has a base frame and a carriage, wherein the base frame is stationary relative to the workpiece can be arranged. The base frame can be positioned relative to the workpiece. Preferably, the base frame is supported on the workpiece and / or releasably connected to the workpiece. The base frame has a guide rail extending in particular in the axial direction. The carriage is in particular movable horizontally on the guide rail. The arm is rotatably mounted on the carriage.

In a particularly preferred embodiment, the material feed device is connected via a flexible supply pipe to the coating device, wherein the coating material can be conveyed within the supply pipe. This has the advantage that the coating device can be used in particular mobile. The coating device and the material feed device can be arranged at an angle to one another. This is advantageous, since in this way the coating device can be flexibly constructed in confined spaces. For example, this allows large gearboxes, for example, bearing seats of wind turbines to be coated locally when installed. The supply pipe may be formed as a corrugated pipe or as a flexible hose. Alternatively, the material feed device coating device are rigidly interconnected.

The coating device is preferably designed as an arc wire spraying device; the material feed device has a corresponding wire magazine. The material feed device serves to convey at least one spray wire. The material thruster has vzw. a conveyor drive, for example, motor-driven wire feed rollers. It is conceivable that the coating device has an additional conveyor drive for conveying the spray wire. The conveyor drive of the material feed device acts essentially pushing and the conveyor drive of the coating device acts essentially pulling to effectively avoid a wire jam.

The material feed device has a guide rail and a magazine carriage, wherein the magazine carriage is displaceable on the guide rail. On the magazine slide the wire magazine is rotatably mounted. The wire magazine is preferably rotatable by means of a drive means. The drive means may be designed as a motor, in particular as an electric motor or act pneumatically or hydraulically. The wire magazine has two wire supply spools. The wire magazine is vzw. connected to the flexible supply pipe. As a result, the feed of the spray gun by moving the wire magazine compensated. Within the supply pipe preferably two spray wires, a gas supply, and possibly electrical lines extend. The spray wires are pushed back according to consumption. The material feed device preferably has at least one rotary feedthrough, wherein gas and / or electrical current can be supplied via the at least one rotary feedthrough. A corresponding gas line preferably extends through the supply pipe. The spray wires are connected via electrical lines to the corresponding contacts of the rotary feedthrough.

It is conceivable that the spray gun is interchangeable with a mechanical processing device, with the mechanical processing device, a mechanical processing of the inner peripheral surface is feasible. This has the advantage that a centering only needs to be done once. It is ensured that the spray gun and the mechanical processing device are rotated and / or moved axially relative to the same center axis both during coating and during mechanical processing.

The aforementioned disadvantages are therefore avoided and corresponding advantages are achieved.

Fig. 1

in einer schematischen, seitlichen Darstellung ein erstes Werkstück und einen Teil einer Beschichtungsvorrichtung, nämlich eine Beschichtungseinrichtung mit einer Spritzpistole, wobei die Spritzpistole an einem verstellbaren Arm in einer ersten Position angeordnet ist,

Fig. 2

in einer schematischen, seitlichen Darstellung ein zweites Werkstück mit einem größeren Durchmesser und die Beschichtungseinrichtung aus Fig. 1, wobei die Spritzpistole in einer zweiten Position angeordnet ist, und

Fig. 3

in einer schematischen, seitlichen Darstellung einen weiteren Teil der Beschichtungsvorrichtung aus Fig. 1 und 2, nämlich eine Materialvorschubeinrichtung.

There are now a variety of ways to design and develop the coating device according to the invention. For this purpose, reference is first made to the claims subordinate to claim 1. In the following, a preferred embodiment of the invention will now be explained in more detail with reference to the drawing and the associated description. In the drawing shows:

Fig. 1

3 is a schematic side view of a first workpiece and a part of a coating device, namely a coating device with a spray gun, wherein the spray gun is arranged on an adjustable arm in a first position,

Fig. 2

in a schematic, side view of a second workpiece with a larger diameter and the coating device Fig. 1 , wherein the spray gun is arranged in a second position, and

Fig. 3

in a schematic, lateral view of a further part of the coating device Fig. 1 and 2 namely a material feed device.

In the Fig. 1 to 3 a coating device 1 for thermal coating is easy to recognize. The coating device 1 is designed for arc wire spraying.

The coating apparatus 1 essentially has two modules connected to one another, namely a coating device 2 (cf. Fig. 1 and 2 ) and a material feeding device 3 (see. Fig. 3 ). The coating device 1 with the coating device 2 and the material feed device 3 stands on a substrate 4 shown very schematically.

With the coating device 1, a workpiece 5a (FIG. Fig. 1 5b ( Fig. 2 ) coatable. The workpiece 5a, 5b is hollow and has an inner surface 6 to be coated. The inner surface 6 may be formed by a bore 7a, 7b. The diameter of the bore 7a may be, for example, 300 mm ( Fig. 1 ). The diameter of the bore 7b may, for example, be 800 mm ( Fig. 2 ).

The coating device 2 has a spray gun 8 and a spray gun holder 9. The spray gun 8 is connected to the spray gun holder 9.

The coating device 1 has at least one drive means 10, 11, wherein the spray gun 8 by means of the at least one drive means 10, 11 during coating around an axis A is rotatable and / or movable in the axial direction is. The axis A extends horizontally. The spray gun holder 9 here has the drive means 10 for moving the spray gun holder 9 in the axial direction. The drive means 10 is assigned to the coating device 2. With the drive means 11, the spray gun 8 is functionally effective rotatable. The drive means 11 is assigned to the material feed device 3 here. The spray gun 8 is displaceable with the two drive means 10, 11 both in the axial direction and rotatable. The two drive means 10, 11 are preferably designed as motors, in particular as electric motors. Alternatively, the drive means 10, 11 may act pneumatically or hydraulically.

With the spray gun 8, a coating material 12 on the inner surface 6 of the hollow workpiece 5a, 5b can be applied. The coating material 12 is thereby thrown onto the inner surface 6. From the spray gun 8 exits a gas stream, wherein the molten particles of the coating material 12 are transported in the gas stream. The coating material 12 is melted inside or outside the spray gun 8.

The disadvantages mentioned above are now avoided in that the spray gun holder 9 is adjustable, wherein the radial positioning of the spray gun 8 is adjustable. This has the advantage that workpieces 5a, 5b can be coated with an inner diameter of more than 100 mm. In particular, workpieces 5a, 5b with an inner diameter of more than 200 mm or preferably of more than 250 mm can be coated. There are workpieces 5a, 5b coated with different sizes inside diameter. The radial adjustment path of the spray gun holder 9 is in particular more than 100 mm, preferably more than 200 mm, more preferably more than 300 mm. The coating apparatus 1 can thereby be set and adapted individually to different workpieces 5a, 5b. The radial positioning is determined and is not changed in particular during the coating. In particular, the coating device 1 can be used in a mobile manner, so that the workpieces 5a, 5b-such as, for example, bearing seats of wind power plants-do not have to be removed, but a coating can be carried out on-site by the customer. The scope of application of the coating device 1 is extended.

Preferably, the angular position of the spray gun 8 is also adjustable relative to the inner surface 5a, 5b. The angular position is detectable and is not changed during the coating except for the rotation. The spray gun holder 9 can for this purpose have a pivotable arm 13, wherein the spray gun 8 is arranged on the arm 13. The arm 13 preferably has at least two arm parts, in particular a front arm part 14 and a rear arm part 15, and at least two joints, in particular a first joint 16 and a second joint 17, on. There are preferably exactly two pivotable arm parts 14, 15 are provided. The front arm part 14 and the rear arm part 15 are pivotally connected to each other via the first joint 16. The front arm part 14 carries the spray gun 8. The rear arm part 15 is further connected to the hinge 17. By pivoting the two arm parts 14, 15 is on the one hand, the radial positioning and the angular position of the spray gun 8 adjustable. The angular position and the radial positioning are determined. For example, the joints 16, 17 can be fixed or fixed by means of corresponding clamping screws (not shown).

The spray gun holder 9 has a base frame 18 and a carriage 19. The base frame 18 is stationary relative to the workpiece 5a, 5b arranged. The base 18 is preferably on the ground 4. The base frame 18 is in particular height adjustable. The base frame 18 is height adjustable. The base frame 18 is supported on at least one particular height adjustable foot 20 on the ground. The base frame 18 can be adjusted over the foot 20 in particular manually or hydraulically in height.

The base frame 18 has a guide rail 21. The carriage 19 is arranged movably on the guide rail 21. The carriage 19 is in particular horizontally movable. The carriage 19 has a plurality of rollers 22. The carriage 19 is supported on the guide rail 21 via the rollers 22. Further, a guide roller 23 is provided, wherein the guide roller 23 is arranged on a guide arm 24. The carriage 19 engages under the Guide rail 21 with the guide roller 23rd

The drive means 10 is arranged on the carriage 19. The drive means 10 can drive a gear which engages in a rack, a worm drive or the like and thus provides for the advancement of the carriage 19.

On the carriage 19, an arm holder 25 is rotatably mounted. The arm holder 25 has a tubular body 26 and a boom 27. The tubular body 26 is rotatably mounted on the carriage 19 and therefore arranged concentrically to the axis A. The boom 27 is fixed to the tubular body 26 and extends in the direction of the workpiece 5a, 5b substantially parallel to the axis A. The rear arm portion 14 is pivotally connected via the second hinge 17 with the arm bracket 25, in particular the boom 7. The arm 13 is thus functionally effective rotatably mounted on the carriage 19.

In a particularly preferred embodiment, the material feed device 3 is connected to the coating device 2 via a flexible supply pipe 28. Within the supply pipe 28, a nebulizer gas and the coating material 12 are conveyed in the form of two injection-molded wires 29 (shown in dashed lines). The supply pipe 28 is preferably formed as a corrugated pipe.

This has the advantage that the coating device 1 can be used in particular mobile. The coating device 2 and the material feeding device 3 are angled at an angle depending on the premises. In particular, the material feed device may extend longitudinally along an axis A ', the axis A' being at an angle to the axis A. This is advantageous, since in this way the coating device 1 can be constructed in a space-saving manner even in confined spaces. For example, this allows bearing seats of wind turbines to be coated on site when installed.

The material feed device 3 has a wire magazine 30 and at least one rotary feedthrough 31. The wire magazine 30 is by means of the drive means 11 rotatable. The wire magazine 30 is operatively connected to the supply pipe 29. The wire magazine 30 has a support frame 32. The support frame 32 is rotatably mounted.

On the support frame 32, two wire coils 33 are rotatably mounted on respective axes (not shown in detail). On the wire coils 33 each of the spray wire 29 is wound. The spray wire 29 extends from the wire spools 33 to at least one wire feed roller, in particular to a plurality of wire feed rollers 34. The wire feed rollers 34 are driven by a motor.

The material feeding device 3 has a frame 35 and a magazine carriage 36. The wire magazine 30 is disposed on the magazine carriage 36. On the magazine carriage 36, the wire magazine 30 is rotatably mounted with the support frame 32. The wire magazine 30, in particular the support frame 32 is rotatably connected to a tubular body 40. The tubular body 40 is connected to the supply pipe 28. The drive means 11 is arranged on the magazine carriage 36. The drive means 11 is preferably designed as an electric motor and drives a belt, wherein the belt wraps around the outer circumference of the tubular body 40. As a result, the drive means 11 forms a rotary drive for the wire magazine 30. The rotational movement is transmitted via the supply pipe 28 to the arm 13 and thus to the spray gun 8.

The magazine carriage 36 is arranged movably on the frame 35. The magazine carriage 36 has corresponding rollers 37 and at least one guide roller 38. The guide roller 38 engages under a corresponding guide rail 39 of the frame 35. The axial feed of the coating device 2, the wire magazine 30 can move on the frame 35.

The wire magazine 30 is disposed within a non-rotatable housing 41. The rotary leadthrough 31 is fastened to the housing 40 with a corresponding connection part. Via the rotary feedthrough 31 is gas (not shown) and el. Electricity (not shown) can be fed. The electricity is over corresponding lines led to the two spray wires 29. The sprayed wires 29, possibly the corresponding lines and at least one gas line extending from the material feed device 3 through the tubular body 40, through the supply pipe 28, through the tubular body 26, exit from the tubular body 26 and are then supplied to the spray gun 8.

The spray gun has a nozzle 42 at one end. The spray wires 29 enter from the nozzle 42 in a Abschmelzbereich. When advancing the spray wires 29 in the Abschmelzbereich (not shown in detail) is formed between the approaching spray wires 29, an arc. The ends of the spray wires 29 are melted in the arc. The molten metal particles are thrown by the gas flow on the prepared inner surface 6 of the bore 7 a, 7 b. Characterized in that spray gun 8 is rotated together with the supply pipe 28 and the wire magazine 30 and axially displaced, and simultaneously in the axial direction in the bore 7a, 7b leads, the entire inner surface 6 of the bore 7a, 7b is coated by the spray jet 43.

The spray gun 8 is preferably interchangeable with a mechanical processing device (not shown), wherein with the mechanical processing device, a mechanical processing of the inner surface 6 is feasible.

The aforementioned disadvantages are avoided and corresponding advantages are achieved.

LIST OF REFERENCE NUMBERS

1

coater

2

coater

3

Material feeding device

4

underground

5a

workpiece

5b

workpiece

6

palm

7a

drilling

7b

drilling

8th

spray gun

9

Spitz holster

10

drive means

11

drive means

12

Coating material

13

poor

14

arm

15

arm

16

joint

17

joint

18

base frame

19

carriage

20

foot

21

guide rail

22

caster

23

leadership

24

idler arms

25

arm bracket

26

pipe body

27

boom

28

supply pipe

29

spray wire

30

wire magazine

31

Rotary union

32

supporting frame

33

wire coil

34

Wire feed rollers

35

frame

36

magazine slide

37

caster

38

leadership

39

guide rail

40

pipe body

41

casing

42

jet

43

spray jet

A

axis

A '

axis

Claims (13)

1. Coating apparatus (1) for thermal coating, having a coating device (2) and having a material feed device (3), wherein the coating device (2) has a spray gun (8) and a spray-gun holder (9), wherein the spray gun (8) is connected to the spray-gun holder (9), wherein the spray gun (8) is rotatable about an axis (A) in a functionally active manner by means of at least one drive means (10, 11) during coating and/or is displaceable in the axial direction, wherein a coating material (12) is able to be applied to an inner face (6) of a hollow workpiece (5a, 5b) using the spray gun (8), characterized in that the spray-gun holder (9) is adjustable, wherein the spray-gun holder (9) has a pivotable arm (13), wherein the spray gun (8) is arranged on the arm (13), wherein the radial positioning of the spray gun (8) with respect to the axis (A) is settable by pivoting the arm (13), wherein the spray-gun holder (9) has a base frame (18) and a carriage (19), wherein the base frame (18) is arrangeable in a fixed position relative to the workpiece (5a, 5b), wherein the base frame (18) has a guide rail (21), wherein the carriage (19) is arranged in a displaceable manner on the guide rail (21).
2. Coating apparatus according to Claim 1, characterized in that the material feed device (3) is connected to the coating device (2) via a flexible supply tube (26), wherein the coating material (12) is able to be conveyed within the supply tube (28).
3. Coating apparatus according to Claim 1 or 2, characterized in that the angular position of the spray gun (8) is settable.
4. Coating apparatus according to the preceding claim, characterized in that the arm (13) has at least two arm parts (14, 15), a front arm part (13) and a rear arm part (14), and at least two joints (16, 17), a first joint (16) and a second joint (17), wherein the front arm part (14) carries the spray gun (8), wherein the front arm part (14) and the rear arm part (15) are connected together via the first joint (16) and the rear arm part (15) is connected to the second joint (17), wherein the radial positioning and the angular position of the spray gun (8) are settable by pivoting the arm parts (13, 14).
5. Coating apparatus according to one of the preceding claims, characterized in that the arm (13) is arranged in a pivotable manner on an arm holder (25), wherein the arm holder (25) is arranged in a rotatable manner on the carriage (19) .
6. Coating apparatus according to the two preceding claims, characterized in that the arm (13) is arranged on the arm holder (25) in a pivotable manner by means of the second joint (17).
7. Coating apparatus according to the two preceding claims, characterized in that the base frame (18) is supported on an underlying surface in a height-adjustable manner via a foot (20).
8. Coating apparatus according to one of the preceding claims, characterized in that the coating apparatus (1) is configured for wire arc spraying, wherein the material feed device (3) has a wire magazine (30) and at least one rotary feedthrough (31), wherein the wire magazine (30) is arranged so as to be rotatable by means of a drive means (11), wherein gas and/or electric current is able to be supplied via the at least one rotary feedthrough (31).
9. Coating apparatus according to Claim 8, where dependent on Claim 2, characterized in that the wire magazine (30) is connected to the supply tube (28) in a functionally active manner.
10. Coating apparatus according to the preceding claim, characterized in that the material feed device (3) has a frame (35) and a magazine carriage (36), wherein the magazine carriage (36) is arranged in a displaceable manner on the frame (35), wherein the wire magazine (30) is arranged on the magazine carriage (36).
11. Coating apparatus according to Claim 8, characterized in that the wire magazine (30) has two wire coils (33) with spray wire (29).
12. Coating apparatus according to one of the preceding claims, characterized in that the spray gun (8) is exchangeable for a mechanical machining unit, wherein the inner face is able to be mechanically machined using the mechanical machining unit.
13. Coating apparatus according to one of the preceding claims, characterized in that workpieces (5a, 5b) with an inside diameter of more than 100 mm, of more than 200 mm or preferably of more than 250 mm are able to be coated.

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