JPH06206025A - Rotating type inner face flame spray apparatus - Google Patents

Abstract

PURPOSE:To effect a favorable flame spray of the inner face of a material to be flame-sprayed even when the outer shape of the material to be flame- sprayed is not a cylindrical shape. CONSTITUTION:The rotating type inner face flame spray apparatus is a one having a housing 10 supported rotatably around the shaft line 12 by means of a supporting apparatus 16 and driven rotatably by means of a driving apparatus 27 and a flame spray nozzle 34 carried by the housing so as to spray a flame spray flow 84 in the direction crossing the shaft line. A plurality of guide pipes 54, 56 and 58 for feeding a flame spray flow raw material connected with the flame spray nozzle on each one of their ends and a plurality of guide pipes 62, 64 and 66 supported by means of a supporting apparatus are respectively connected with a fluid joint 60 around the shaft line and relatively and rotatably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal spraying device, and more particularly to a rotary type inner surface thermal spraying device.

[0002]

2. Description of the Related Art As one of the thermal spraying devices for thermal spraying the inner surface of a hollow pipe, a thermal spraying nozzle and a support for supporting the thermal spraying nozzle at its tip are disclosed, for example, in Japanese Patent Laid-Open No. 186972/1987. An arm, a moving device for moving the support arm along its longitudinal direction, and a plurality of arms that are rotatable about an axis of rotation parallel to the longitudinal direction of the support arm and that rotatably support the pipe about its axis. 2. Description of the Related Art An inner surface spraying apparatus having a rotary wheel and a rotary drive device for rotating a pipe around the axis of rotation of the pipe by rotating the rotary wheel around the axis of rotation thereof has been conventionally known.

According to such an inner surface thermal spraying device, the thermal spraying nozzle is fixed to the tip of the supporting arm so that the thermal spraying direction is transverse to the longitudinal direction of the supporting arm, and the thermal spraying nozzle and the supporting arm are inserted into the pipe to rotate. By arranging the pipe on the wheel and rotating the rotating wheel by the drive device to rotate the pipe around its axis and moving the support arm by the moving device, the thermal spray nozzle sprays the pipe onto the pipe. The inner surface of the can be sprayed spirally.

[0004]

However, in the conventional inner surface thermal spraying apparatus as described above, the rotary wheels are rotationally driven around their rotational axes by the rotary drive unit so that the material to be sprayed is rotated about its axis. Since the material to be sprayed is rotated around, if the material to be sprayed is a member having a cylindrical outer shape such as a pipe, the material to be sprayed can be rotated well around its axis. When the outer shape of the thermal spray material is a shape other than a cylindrical shape such as a prismatic shape, the thermal spray material cannot be satisfactorily rotated around its axis, and therefore the internal surface of the thermal spray material should be sprayed well. There is a problem that you can not.

In view of the problems described above in the conventional inner surface thermal spraying apparatus, the present invention is capable of favorably spraying the inner surface of the material to be sprayed even when the outer shape of the material to be sprayed is a shape other than a cylindrical shape. It is an object of the present invention to provide an improved inner surface thermal spraying device.

[0006]

SUMMARY OF THE INVENTION According to the present invention, the objects as set forth above are carried by a housing rotatable about an axis and on one end of the housing for injecting a thermal spray jet in a direction transverse to said axis. A spray nozzle, a supporting means for rotatably supporting the other end of the housing about the axis, a driving means for rotationally driving the housing around the axis, and one end connected to the spray nozzle. A plurality of first thermal spray jet raw material supply conduits, a plurality of second thermal spray jet raw material supply conduits carried by said support means, and a plurality of said plurality of first thermal spray jet raw material supply conduits This is achieved by a rotary inner surface spraying device having a plurality of second spraying jet feedstock supply conduits and fluid couplings respectively individually rotatably rotatable about the axis.

[0007]

According to the above-mentioned structure, the spray nozzle is carried at one end of the housing so as to inject the spray jet in the direction transverse to the axis, and the spray nozzle is rotated by the driving means to rotate the housing around the axis. A plurality of first spray jet feedstock feed conduits that are rotatable about an axis and that are connected at one end to the spray nozzle and a plurality of second spray jet feedstock supply conduits carried by the support means; Each of them is individually connected by a fluid coupling so as to be relatively rotatable around the axis line, and even if the housing is rotated relative to the supporting means, the fluid coupling and the first thermal spray raw material are supplied from the second thermal spray jet raw material supply conduit. Supplying thermal spray powder materials such as thermal spray powder and combustion gas to the thermal spray nozzle through the supply conduit,
A thermal spray jet can be jetted from the thermal spray nozzle in a direction transverse to the axis.

Therefore, according to the rotary inner surface thermal spraying apparatus of the present invention, a hollow thermal spray material to be sprayed is fixedly disposed on the inner surface, and the housing is inserted into the thermal spray material from one end thereof.
Rotating the housing around the axis relative to the material to be sprayed and the supporting means by the driving means while moving the spraying jet from the spray nozzle in a direction transverse to the axis, and moving the material to be sprayed along the axis of the housing. Due to
The thermal spray jet can be caused to collide with the inner surface of the material to be sprayed in a spiral shape, whereby the inner surface of the material to be sprayed can be satisfactorily sprayed regardless of the outer shape of the material to be sprayed.

[0009]

[Supplementary Explanation of Means for Solving the Problem] FIG. 11A
As shown in FIG. 4, when the angle θ formed by the axis 152 of the thermal spray jet 150 with respect to the surface 154A of the material to be sprayed 154 on the delayed side is defined as the thermal spray angle, the thermal spray jet is less than 60 ° when the thermal spray angle is less than 60 °. Since the adhesion rate of the thermal spray material is low even when sprayed onto the surface of the thermal spray material, a part of the thermal spray material that did not adhere to the surface of the thermal spray material becomes scattered particles 156 in the downstream direction when viewed in the moving direction of the thermal spray jet. At the surface of the material to be sprayed,
The scattered particles thus attached as shown in FIG. 11 (B) grow by the successive attachment of the scattered particles to them, and thereafter the thermal sprayed material 154 is sprayed as shown in FIG. 11 (C). Since the material adheres to form the sprayed layer 158, the discontinuous oxide layer 160 composed of the original scattered particles is easily generated in the sprayed layer, and the surface of the sprayed layer is caused by the shielding phenomenon due to the adhered scattered particles. Is likely to be rough or the thickness of the sprayed layer is not uniform.

On the contrary, when the spray angle θ exceeds 120 °, the same phenomenon as when the spray angle is less than 60 ° occurs when the moving direction of the material to be sprayed with respect to the housing is reversed, which is favorable. It becomes impossible to perform thermal spraying. Further, as the spray angle becomes smaller, the adhesion strength of the spray layer to the base material generally tends to decrease. From this point, the spray angle θ is preferably set to 70 ° or more and 110 ° or less.

Therefore, in the inner surface spraying apparatus of the present invention, the spraying nozzle has a spraying angle θ of 60 to 120 °, preferably 7 °.
It is carried in the housing such that the angle of inclination of the axis of the thermal spray jet with respect to the axis of the housing is 0 to 110 °, that is, 60 to 120 °, preferably 70 to 110 °.

[0012]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view showing a first embodiment of a rotary inner surface thermal spraying apparatus according to the present invention configured as a flame spraying apparatus, and FIG. 2 is a plan sectional view showing a part of the first embodiment. Figure 3
FIG. 3 is a sectional view taken along line III-III in FIG. 1.

In these drawings, reference numeral 10 denotes a housing composed of a large diameter portion 10A and a small diameter portion 10B extending along the axis 12, and the housing 10 has a bearing 14 arranged in the small diameter portion 10B. Via the support device 16 through the axis 1
It is cantilevered rotatably around 2. The pulley 20 is fixed to the small diameter portion 10B.
Also, a belt 26 is wound around a pulley 24 fixed to the shaft of the motor 22, so that the housing 10 is rotationally driven around the axis 12. Thus, the motor 22, the pulleys 20 and 24, and the belt 26 cooperate with each other to form a driving device 27 that drives the housing 10 to rotate about the axis 12.

The tip of the large diameter portion 10A of the housing 10 has a flat portion 28 extending along the axis 12 and a flat portion 30 extending obliquely with respect to the axis 12.
A spray nozzle 34 having an axis 32 is fixed to the flat portion 28 in 0A. In the illustrated embodiment, axis 3
2 intersects the axis 12 at the intersection P and extends perpendicularly to the axis 12. As shown in detail in FIG. 4, the spray nozzle 34 includes an annular powder passage 3 extending along an axis 32.
6, an inner air passage 38 tapering around the powder passage 36 along the axis 32, and an annular combustion gas passage 4 tapering around the passage 38 along the axis 32.
0, and an annular outer air passage 42 that tapers around the passage 40 along the axis 32.

The inner air passage 38 and the outer air passage 42 are connected in communication with an annular passage 48 extending around the axis 32 by a plurality of radially extending passages 44 and 46, respectively. An annular passage 52 extending around the axis 32 by a plurality of radially extending passages 50.
Connected to. One end of a powder supply conduit 54 is connected in communication with the powder passage 36, and although not shown in the drawing, the air supply conduit 5 is provided in each of the annular passages 48 and 52.
6 and one end of the combustion gas supply conduit 58 are communicatively connected.

The other ends of the powder supply conduit 54, the air supply conduit 56 and the combustion gas supply conduit 58 are connected by fluid coupling 60 to one end of the powder supply conduit 62, the air supply conduit 64 and the combustion gas supply conduit 66, respectively, and the axis 12 thereof. Is connected so as to be capable of relative rotation around. Although not shown in the figure, the powder supply conduit 62, the air supply conduit 64 and the combustion gas supply conduit 66 are fixedly supported by the support device 16, and the other ends of these conduits are respectively of nitrogen or argon gas. Such as powder supply source for supplying thermal spray powder with carrier gas, air supply source for supplying compressed air, combustion gas for supplying combustion gas such as mixed gas of combustible gas such as propane gas, acetylene gas, propylene gas and oxygen Connected to the source.

As shown in FIGS. 5-7, the fluid coupling 60 includes a fixed flange 68 secured to one end of a powder supply conduit 62, an air supply conduit 64 and a combustion gas supply conduit 66.
And a rotary flange 70 fixed to the other ends of the powder supply conduit 54, the air supply conduit 56 and the combustion gas supply conduit 58. In the illustrated embodiment, the fixed flange 68
Has a disc portion 68A and a cylindrical portion 68B, and rotatably supports the large-diameter portion 10A of the housing 10 around the axis 12 via a bearing 72 on a substantially cylindrical outer surface.

A seal sheet 73 having three holes aligned with the other ends of the conduits 54, 56 and 58 is fixed to the side surface of the rotary flange 70 facing the fixed flange 68 by adhesion. An annular rotary flange holding member 74 is fixed to the tip of the cylindrical portion 68B by screwing or press fitting, and bearings 76 and 78 are provided between the outer peripheral portion of the rotary flange 70 and the disc portion 68A and the holding member 74, respectively. And the rotating flange is fixed together with the powder supply conduit 54, the air supply conduit 56 and the combustion gas supply conduit 58 in a state where the rotating flange is in close contact with the disk portion 68A via the seal sheet 73. With respect to it, it is designed to rotate around the axis line 12.

The other end of the powder supply conduit 54 and one end of the powder supply conduit 62 oppose each other along the axis 12 and are in substantial direct communication with each other. On the side surface of the disc portion 68A facing the rotating flange 70, annular grooves 80 and 82 are provided which are radially spaced from each other and extend concentrically with respect to the axis 12. One ends of the air supply conduit 64 and the combustion gas supply conduit 66 are connected in communication with the annular grooves 80 and 82, respectively, and the air supply conduit 56 and the combustion gas supply conduit 58 are provided.
The other ends of the air supply conduits 56 and 64 communicate with each other through the annular groove 80 so that the other ends of the combustion gas supply conduit 5 and the air inlet conduits 56 and 64 communicate with each other.
8 and 66 communicate with each other via an annular groove 82.

Thus, even though the housing 10 is rotated about the axis 12 relative to the support device 16, a powder supply conduit 62, an air supply conduit 64 and a combustion supply respectively from a powder supply source, an air supply source and a combustion gas supply source. Gas supply conduit 6
6, fluid coupling 60, powder supply conduit 54, air supply conduit 5
6 and the combustion gas supply conduit 58, spray powder, cooling air, and combustion gas can be supplied to the spray nozzle 34. The spray powder is sprayed along the axis 32 from the tip of the powder passage 36, and the cooling air is inside air. Passage 38 and outer air passage 4
2 is injected in a ring shape along the axis 32 from the tip of 2, and the combustion gas is injected in a ring shape along the axis 32 from the tip of the combustion gas passage 40, whereby the spray jet 84 is provided in the flat portion 28 from the spray nozzle. It is designed to be ejected along the axis 32 through the hole 28A.

Since the structure of the thermal spray nozzle itself does not form the subject of the present invention, the thermal spray nozzle has a spray jet axis 3 as its axis.
It may be of any construction as long as it is jetted along 2. For example, the thermal spray powder may be fed transversely to the combustion gas stream flowing radially along the axis 32.

When the inner surface of a hollow thermal spray material is sprayed using the illustrated embodiment, the thermal spray material 88 is placed on a reciprocating support base 86, as shown in FIG. The tip of the housing is inserted into the hollow hole 90 of the material to be sprayed 88 so that the axis line 12 of the housing 10 is substantially aligned with the axis line 92 of the hollow hole. Next, a thermal spray jet 84 is ejected from the thermal spray nozzle 34 along the axis 32, that is, perpendicularly to the axis 12.
The housing 10 is rotated around the axis 12 by a driving device 27 not shown in FIG.
Is moved along the axis 92 together with the support base 86.

In this case, since the axis 32 of the spray jet 84 is perpendicular to the axis 12 of the housing 10, the axis 32 becomes perpendicular to the surface of the hollow hole 90 of the material 88 to be sprayed, and the amount of scattered particles is reduced. As a result, thermal spraying can be performed with good yield, and at the same time, there is a risk that a discontinuous oxide layer due to scattered particles is generated in the thermal sprayed layer to be formed and the surface roughness of the thermal sprayed layer is reduced. It is possible to form a sprayed layer having excellent adhesion strength to the base material.

FIG. 9 is a longitudinal sectional view showing another embodiment of the fluid coupling which may be incorporated in the rotary type inner surface thermal spraying device according to the present invention, and FIG. 10 is a half sectional view taken along line XX in FIG. is there. In these figures, the parts corresponding to the parts shown in FIGS. 1 to 7 are designated by the same reference numerals as those shown in FIGS. 1 to 7.

In the fluid coupling 60 of this embodiment, one end of the powder supply conduit 62 is fitted with the enlarged other end of the powder supply conduit 54 via the seal 94 so as to be relatively rotatable around the axis 12. I am fit. An inner fixed cylindrical body 96 is fixed to the powder supply conduit 62 by a flange portion 96A provided at one end thereof, and the inner fixed cylindrical body 96 extends concentrically with the powder supply conduit 62. An annular end wall 98 is fixed to the inner surface of the other end of the inner fixed cylindrical body 96.
8 and the powder supply conduit 62 are sealed by an O-ring seal 100, and the inner fixed cylinder 96 and the end wall 9 are sealed.
8 is a cylindrical inner space 10 in cooperation with the powder supply conduit 62.
2 is demarcated.

The inner fixed cylindrical body 96 includes an outer fixed cylindrical body 1.
A flange portion 104A provided at one end thereof is fitted and fixed in a state in which the flange portion 104A is in contact with the flange portion 96A, and the outer fixed cylindrical body 104 extends concentrically with the inner fixed cylindrical body 96. An annular end wall 106 is fixed to the inner surface of the other end of the outer fixed cylinder 104, and an O-ring seal 108 seals between the end wall 106 and the inner fixed cylinder 96. Body 104 and end wall 1
06 cooperates with the inner fixed cylindrical body 96 to define a cylindrical inner space 110.

A radial passage 96B is provided in the flange portion 96A of the inner fixed cylindrical body 96, and the passage 96B is provided.
The other end of the air supply conduit 64 is connected to communicate with. Similarly, the flange portion 104A of the outer fixed cylindrical body 104
A radial passage 104B is provided in the
The other end of the combustion gas supply conduit 66 is connected so as to communicate with 04B.

Inner fixed cylinder 96 and outer fixed cylinder 1
A rotary flange 112 is fitted to the other end of 04 so as to be rotatable around the axis 12 relative to them. The rotary flange 112 is positioned by a lock nut 114 screwed to the other end of the inner fixed cylindrical body 96. A ring seal 11 is provided between the rotary flange 112 and the shoulder of the inner fixed cylinder 96, the end wall 98, and the tip of the outer fixed cylinder 104.
6, a ring seal 118 is interposed between the rotary flange 112 and the shoulder portion of the outer fixed cylindrical body 104, and the rotary flange 112 and the lock nut 114 are disposed.
A ring seal 120 is interposed between and.

Inner fixed cylindrical body 96 of the rotary flange 112
And annular grooves 122 and 124 are respectively provided on the cylindrical surfaces that are in sliding contact with the outer fixed cylindrical body 104.
22 and 124 are a plurality of holes 126 and 1 provided in the inner fixed cylinder 96 and the outer fixed cylinder 104, respectively.
28 connects the internal spaces 102 and 110 to each other. Further, the rotary flange 112 has annular grooves 12 respectively.
2 and 124 are provided to communicate with the radial passages 130 and 132, and the other ends of the air supply conduit 56 and the combustion gas supply conduit 58 are connected to communicate with the passages 130 and 132.

Although not shown in FIGS. 9 and 10,
Powder supply conduit 62, air supply conduit 64, combustion gas supply conduit 66, inner fixed cylinder 96 and outer fixed cylinder 104.
Is fixedly supported by the supporting device 16 shown in FIG. 1, and the powder supply conduit 54, the air supply conduit 56, the combustion gas supply conduit 58, and the rotary flange 112 are rotatably supported by the housing 10 about the axis 12. It is supported and is designed to rotate with the housing.

Thus, even if the housing 10 is rotated about the axis 12 relative to the support device 16, the thermal spray powder and carrier gas supplied from the powder source via the powder supply conduit 62 remains in the powder supply conduit 54. Supplied,
The cooling air supplied from the air supply source through the air supply conduit 64 is the radial passage 96B, the internal space 102, the hole 126,
Air supply conduit 5 via annular groove 122 and radial passage 130
6 and the combustion gas supply conduit 6 from the combustion gas supply source.
Combustion gas supplied via 6 passes through the radial passage 104B, the internal space 110, the hole 128, the annular groove 124, and the radial passage 1.
It is supplied to the combustion gas supply conduit 58 via 32, so that the fluid coupling of this embodiment operates similarly to the fluid coupling 60 shown in FIG.

Although the present invention has been described above in detail with reference to specific embodiments, the present invention is not limited to these embodiments, and various other embodiments within the scope of the present invention. It will be apparent to those skilled in the art that

For example, the fluid coupling 60 is not limited to the structure of the illustrated embodiment, and even if the housing 10 is rotationally driven about the axis 12 relative to the supporting device 16, the fluid coupling 60 can be rotated and fixed. Powder supply conduits 54 and 62, air supply conduits 56 and 64, combustion gas supply conduits 58 and 6
Any structure may be used as long as 6 can be connected to each other so as to be relatively rotatable.

[0035]

As is apparent from the above description, according to the present invention, the housing is inserted from one end into a hollow material to be sprayed whose inner surface is to be sprayed, and the housing is sprayed in a direction transverse to the axis. By rotating the housing around the axis with respect to the material to be sprayed and the supporting means by the driving means while injecting a jet stream, and moving the material to be sprayed along the axis of the housing, with respect to the inner surface of the material to be sprayed. The thermal spray jet can be made to collide in a spiral shape, whereby the inner surface of the thermal spray material can be sprayed well regardless of the outer shape of the thermal spray material.

Also, for example, US Pat. No. 5,014,916
As described in Japanese Patent Laid-Open Publication No. JP-A No. 2003-242242, a thermal spray nozzle ejects a thermal spray jet along the axis of the housing, and the nozzle jet is deflected by the nozzle tip in a direction transverse to the axis of the housing, and the nozzle tip is rotated around the axis of the housing. Therefore, when the thermal spray jet is rotated about the axis of the housing, the inclination angle of the axial line of the thermal spray jet with respect to the housing is limited to 45 ° due to problems such as nozzle tip melting damage. For example, when the particle size is as small as 100 mm or less, a large amount of scattered particles are generated, so that the yield of spraying is low, a discontinuous oxide layer of scattered particles is likely to be formed in the sprayed layer, and the surface of the sprayed layer is rough. In addition, the thickness of the sprayed layer is likely to be uneven, and the adhesion strength of the sprayed layer to the base material is likely to be reduced.

On the other hand, according to the present invention, the inclination angle of the axis of the thermal spray jet with respect to the axis of the housing can be set arbitrarily, and the inclination angle is set to, for example, 60 to 120 °, preferably 70 to 110 °. Therefore, it is possible to reduce the amount of scattered particles to increase the yield of thermal spraying, reduce the risk of discontinuous oxide layers in the thermal sprayed layer, and increase the surface smoothness. It is possible to form a sprayed layer having a uniform thickness and high adhesion strength to the base material.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of a rotary internal surface spraying apparatus according to the present invention, which is configured as a flame spraying apparatus.

FIG. 2 is a plan sectional view showing a part of the first embodiment.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is an enlarged partial vertical sectional view showing the thermal spray nozzle of the first embodiment.

FIG. 5 is an enlarged partial vertical cross-sectional view showing the fluid coupling of the first embodiment.

6 is a cross-sectional view taken along the line VI-VI of FIG.

7 is a sectional view taken along the line VII-VII of FIG.

FIG. 8 is an explanatory diagram showing a procedure for spraying the inner surface of a hollow material to be sprayed using the first embodiment.

FIG. 9 is a vertical sectional view showing another embodiment of the fluid coupling which may be incorporated in the rotary inner surface thermal spraying device according to the present invention.

10 is a half cross-sectional view taken along the line XX of FIG.

FIG. 11 is an explanatory diagram showing a spray angle θ.

[Explanation of symbols]

 10 ... Housing 16 ... Supporting device 22 ... Motor 26 ... Belt 27 ... Driving device 34 ... Spraying nozzle 54, 62 ... Powder supply conduit 56, 64 ... Air supply conduit 58, 66 ... Combustion gas supply conduit 60 ... Fluid coupling 68 ... Fixed Flange 70 ... Rotating flange 84 ... Thermal spray jet 88 ... Thermal spray material 96 ... Inner fixed cylindrical body 104 ... Outer fixed cylindrical body 112 ... Rotating flange

Claims (1)

[Claims] 1. A housing rotatable about an axis, a spray nozzle carried at one end of the housing to inject a spray jet in a direction transverse to the axis, and the other end of the housing around the axis. Supporting means for rotatably supporting, driving means for driving the housing to rotate about the axis, a plurality of first spraying jet raw material supply conduits connected to the spraying nozzle at one end, and the supporting means. A plurality of second thermal spray jet raw material supply conduits carried by and a plurality of second thermal spray jet raw material supply conduits corresponding to the plurality of first thermal spray jet raw material supply conduits around the axis. A rotary inner surface thermal spraying device having a fluid coupling connected to each of them so as to be relatively rotatable.