JPH0797674A - Flame spraying device for outside surface of tubular body - Google Patents

Abstract

PURPOSE:To prevent splashing of flam spraying mists by that an opening area of a hood is made small and to efficiently recover the mists even if a blower capacity is relatively small. CONSTITUTION:A moving truck 11 is provided with the liftable hood 19. The lifting hood 19 is so formed that the front end nozzles of frame spraying guns 26 face the internal space through the hood in an upper limit position. Apertures 32 in which tubular bodies 1 can pass are formed on both end faces of the lifting hood 19. These apertures are so constituted that the circumferences of the tubular bodies 1 penetrated through the apertures can be enclosed over a suitable length. Further, the device is so constituted that a discharge duct 34 on the lifting hood side opened in the lifting hood 19 and extended upward when the lifting hood 19 is lowered detaches from a discharge duct 36 on a stationary side disposed in the moving truck 11 and that the nozzles at the front ends of the flame spraying guns 26 are exposed out of the lifting nozzle 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe outer surface thermal spraying device for spraying a base material such as zinc on the outer surface of a pipe body such as a cast iron pipe.

[0002]

2. Description of the Related Art In a conventional outer surface thermal spraying apparatus for a tubular body, a tubular body 1 is placed on a supporting roller 2 as shown in FIG. 4, and a fixed hood 3 for collecting the thermal spray mist is disposed below the tubular body 1. A movable hood 5 which is disposed over the entire length of the pipe body 1 and which has a thermal spray gun 4 for injecting a thermal spray material therein and which covers the upper portion of the pipe body 1 over an appropriate length is provided movably in the length direction of the pipe body 1. 1
By moving the movable hood 5 in the lengthwise direction of the tubular body 1 while rotating, the thermal spraying of the base material over the entire length of the tubular body 1 is generally performed.

[0003]

DISCLOSURE OF THE INVENTION In an outer surface thermal spraying apparatus for a pipe body, a wind speed corresponding to the spraying speed is required for recovering the sprayed mist, and furthermore, the wind speed must be considerably higher than that in coating with a paint. . Furthermore, as shown in FIG.
The opening area of the fixed hood 3 is large, and the fixed hood 3
Since the lower part of the portion corresponding to the support roller 2 is omitted, the sprayed mist is likely to be scattered, and a larger amount of air is required for mist recovery. Therefore, a powerful blower for collecting mist is required, and the device must be large.

The present invention solves the above problems by reducing the opening area of the hood to prevent the spray mist from scattering and to improve the mist recovery efficiency without increasing the blower capacity, and further raising and lowering the hood. It is an object of the present invention to provide a pipe outer surface thermal spraying device which enables maintenance of the thermal spray gun to be easily performed by enabling the tip nozzle of the thermal spray gun to be exposed from the lowered hood. .

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an outer surface thermal spraying apparatus of a pipe body according to the present invention has a spray gun installed at the lower end of a fixed frame fixed to a movable carriage and is moved up and down along the fixed frame. And a hood is attached to the lower end of the elevating frame so that the tip nozzle of the thermal spray gun can penetrate the elevating hood at the upper limit position to face the internal space. An opening through which a pipe can pass is formed on both end faces of the moving carriage in the moving direction, and the pipe penetrated through this opening is configured to surround the pipe for an appropriate length, and when the lifting hood is further lowered. The lifting hood-side exhaust duct, which is opened in the lifting hood and extends upward, separates from the fixed-side exhaust duct provided on the moving carriage so as to fit into it,
The tip nozzle of the thermal spray gun is configured to be exposed from the lifting hood.

[0006]

With the above construction, the elevating hood is constructed as a substantially hermetic type in which the pipe body is penetrated through the openings formed on both end faces thereof and the periphery of the pipe body is surrounded by an appropriate length. The opening area of the hood is reduced, the spray mist is prevented from scattering, the air volume for collecting mist is not required so much, and the blower capacity for collecting mist does not have to be so strong. Can be downsized. When the elevating hood is further lowered, the spray gas tip nozzle is exposed from the elevating hood, and the exhaust duct on the elevating hood side separates from the fixed side exhaust duct, so maintenance and inspection of the spray nozzle is performed through this gap. Easy to do.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram for explaining the entire outer surface of the tubular body thermal spraying apparatus according to an embodiment of the present invention, and FIG. FIG. 3 is a side view of a main part in the length direction of the pipe body to be sprayed.

In FIG. 1, reference numeral 11 denotes a movable carriage which moves on a pedestal 12 along the length direction of the pipe body 1 to be sprayed, and which has a storage case 14 for storing a main body 13 of the sprayed portion and a zinc wire as a spraying material. It is equipped with. The thermal spraying unit main body 13 is composed of a fixed frame 15 fixed to the moving carriage 11 and an elevating frame 16 that can be moved up and down along the fixed frame 15. The fixed frame 15 has a zinc wire fed from the storage case 14 and is sprayed as described later. A guide tube 17 for guiding to the gun is attached, and a lifting hood 19 that is separable from a fixed duct 18 fixed to the moving carriage 11 when descending is attached to the tip of the lifting frame 16. Numerals 20 and 21 are pipe body holding devices installed below both ends of the gantry 12 so that the pipe body 1 which is conveyed by the conveyance carriage 22 and raised by the elevating table 23 can be rotated by the holding portions 24 and 25 from both ends. Hold to maintain the spray position. Further, the lifting hood 19 is the tube body 1 held by the holding portions 24 and 25 of the tube body holding devices 20 and 21.
It is possible to move by the moving carriage 11 in a state where it penetrates.

In FIGS. 2 and 3, reference numeral 26 denotes a thermal spray gun fixed to the lower end of the fixed frame 15, which is a tubular body holding device 20, 21.
Of the guide tube 1 that is located opposite to the tubular body 1 held by the holding portions 24 and 25 of the
7 are connected in communication, and the zinc wire 27 guided in the guide tube 17 is melted by arc discharge and molten zinc is sprayed to spray the outer surface of the tubular body 1 as a base material. 28 is a sprocket provided on the moving carriage 11 and driven by a motor 29. The tip of the chain 20 wound around the sprocket is connected to the elevating frame 16, and the elevating frame 16 is connected by the motor 29 via the sprocket 28 and the chain 30. Can be lifted up and down. At this time, the four corners of the elevating frame 16 are guided by the guide rollers 31 provided on the fixed frame 15, and the elevating operation of the elevating frame 16 is smoothly performed.

An elevating hood 19 attached to the tip of the elevating frame 16 has a tip nozzle 26a of the thermal spray gun 26 at the upper limit position.
Is provided so as to face the internal space, and openings 32 through which the pipe body 1 held at the zinc spraying position penetrates are provided on both end surfaces of the lifting hood 19 in the moving carriage 11 moving direction, and It is formed so as to surround the periphery of the formed pipe body 1 over an appropriate length, and by these, the elevating hood 19 has a substantially sealed configuration. Further, end face exhaust ducts 33, which respectively open into the lifting hood 19, at both end faces of the lifting hood 19 provided with the openings 32 are extended upward along the outer surface of the lifting frame 16, and both ends of the lifting hood 19 are also extended. A side surface exhaust duct 34 that opens in the elevating hood 19 at a side surface portion between the surfaces extends upward along the outer surface of the elevating frame 16 at a position different from the end surface exhaust duct 33. The fixed-side duct 18 is fixed to the movable carriage 11 so as to be fitted onto the two end-face exhaust ducts 33 extending upward from both end-faces of the lifting hood 19. And one side surface side fixed exhaust duct 36 fixed to the moving carriage 11 so as to be fitted onto one side surface exhaust duct 34 extending upward from the side surface of the elevating hood 19. At the upper limit position of the hood 19, the end face exhaust duct 33 is deeply fitted to the end face side fixed exhaust duct 35, and the side face exhaust duct 34 is shallowly fitted to the side face side fixed exhaust duct 36. . Therefore, when the elevating frame 16 is lowered and the elevating hood 19 is lowered to the position shown by the phantom line in FIG. 2 in a state where the pipe body 1 is not penetrated, the end face exhaust duct 33 of the elevating hood 19 is fixed to the end face side. Although it is not separated from the exhaust duct 35, the side surface exhaust duct 34 is separated from the side surface side fixed exhaust duct 36, and the lifting hood 19 is separated from the fixed side duct 18 at this point. At this time, since the tip nozzle 26a of the thermal spray gun 26 that penetrates the lifting hood 19 and faces the internal space is also exposed to the outside of the lifting hood 19, the side surface exhaust duct 34 and the side surface side fixed exhaust duct 36 are provided. It is possible to perform maintenance and inspection of the thermal spray gun 26 through the gap between the separated points.

Two end face side fixed exhaust ducts 35 fixed to the movable carriage 11 and one side face side fixed exhaust duct 3 are provided.
6 is on the moving carriage 11 and is located at 1 of the exhaust duct 37 shown in FIG.
The spray mist is collected in a book and sucked by an appropriate blower (not shown). At this time, since the lifting hood 19 is configured in a narrow space of a substantially sealed type except for the opening 32, a sufficient suction force can be obtained even if the blower has a relatively small blower capacity. The downsizing of the device can be easily achieved, and the spray mist can be sufficiently recovered without being scattered.

Next, the operation of the external surface thermal spraying device having the above structure will be described. Before the pipe body 1 is held by the holding portions 24 and 25 of the pipe body holding devices 20 and 21, the raising and lowering hood 19 is raised to the upper limit position by the raising and lowering frame 16 to move the moving carriage 1
1 is moved, and the elevating hood 19 is retracted through the opening 32 to the position of FIG. 1 in which the distal end of the one tubular body holding device 20 including the holding portion 24 is penetrated. Next, the pipe body 1 that has been conveyed by the conveyance carriage 22 and raised by the elevating table 23 is held by the holding portions 2 of the pipe body holding devices 20 and 21.
After being rotatably held by 4, 26, the movable carriage 11 is moved forward, the spray gun 26 is operated, and the molten zinc is sprayed onto the outer surface of the pipe body 1 penetrating through the elevating hood 19, and the blower is driven. The spray mist is sucked by the end surface exhaust duct 33 and the side surface exhaust duct 34. At this time, since the lifting hood 19 is almost sealed, even if the blower capacity is relatively small as described above, the spraying material can be sufficiently sucked without being scattered.

Next, when performing maintenance and inspection of the thermal spray gun 26, the elevating frame 16 is lowered while the tube 1 is not held,
The tip nozzle 26a of the thermal spray gun 26 is exposed to the outside of the lifting hood 19, and the side surface exhaust duct 34 of the lifting hood 19 is detached from the side surface side fixed exhaust duct 36, and maintenance inspection is performed from the gap generated at this location. .

[0014]

As described above, according to the present invention, the hood penetrates the pipe body through the openings formed at both end faces thereof, and the hood is surrounded by a substantially closed type. Since the opening area of the elevating hood is small, the spray mist can be prevented from scattering, and the blower ability for collecting the mist does not have to be very strong, and the device can be downsized. When the hood is further lowered, the tip nozzle of the spray gun is exposed from the lifting hood, and the exhaust duct on the hood side separates from the exhaust duct on the fixed side, making maintenance and inspection of the spray nozzle easy through this gap. Can be done.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram illustrating an entire tubular body outer surface thermal spraying device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional front view of a main part of the tube outer surface thermal spraying device in a direction perpendicular to the length direction of the tube to be sprayed.

FIG. 3 is a side view of a main portion in a longitudinal direction of a pipe body to be sprayed of the pipe outer surface thermal spraying device.

FIG. 4 is a cross-sectional front view and a cross-sectional side view of a conventional tube outer surface thermal spraying device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe 11 Moving carriage 15 Fixed frame 16 Elevating frame 19 Elevating hood 20,21 Pipe holding device 26 Thermal spray gun 32 Opening 33 End face exhaust duct 34 Side exhaust duct 35 End face side fixed exhaust duct 36 Side face side fixed Exhaust duct

Continued Front Page (72) Inventor Yo Nagai 2-26 Ohamacho Amagasaki City Hyogo Prefecture Kubota Mukogawa Works

Claims (1)

[Claims] 1. A thermal spray gun installed at a lower end of a fixed frame fixed to a moving carriage, an elevating frame that can be moved up and down along the fixed frame, and an elevating frame attached to a lower end of the elevating frame so that the thermal spray is performed at an upper limit position. The tip nozzle of the gun penetrates to face the internal space, has an opening through which the pipe can penetrate on both end surfaces in the moving direction of the movable carriage, and has an appropriate length around the pipe penetrated through the opening. An elevating hood that is formed so as to surround the elevating hood, and a fixed exhaust duct that is fixed to the moving carriage and that fits into an elevating hood-side exhaust duct that is opened in the elevating hood and extends upward, A pipe outer surface thermal spraying device configured such that the elevating hood side exhaust duct can be detached from the fixed side exhaust duct by lowering the elevating hood, and the tip nozzle of the spray gun is exposed from the elevating hood.