JP2950353B2 - Tube outer surface spraying device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional tube outer surface spraying apparatus mounts a tube 1 on a supporting roller 2 and mounts a fixed hood 3 below the tube 1 for collecting a spray mist. A movable hood 5 is provided movably in the longitudinal direction of the tubular body 1 and has a built-in thermal spray gun 4 for spraying a thermal spray material over the tubular body 1 and covering an appropriate length above the tubular body 1. 1
By rotating the movable hood 5 in the length direction of the tube 1 while rotating the tube 1, it is general that the base material is sprayed over the entire length of the tube 1.

[0003]

In a tubular body outer surface thermal spraying apparatus, a wind speed corresponding to the spraying speed is required for collecting the sprayed mist, and furthermore, the wind speed must be considerably higher than that of the paint coating. . Further, as shown in FIG.
The opening area of the fixed hood 3 is large, and the fixed hood 3
The lower part of the portion corresponding to the supporting roller 2 is omitted, so that the sprayed mist is easily scattered, and the air flow for collecting the mist requires more. Therefore, the blower capacity for collecting the mist must be strong, and the apparatus must be large.

The present invention has been made to solve the above-mentioned problem. The present invention reduces the opening area of the hood, thereby preventing the spray mist from scattering and improving the mist collection efficiency without increasing the blower capacity. It is an object of the present invention to provide an outer surface spraying apparatus for a tubular body, which makes it possible to easily perform maintenance and inspection of a spraying gun by allowing a tip nozzle of the spraying gun to be exposed from a lowered hood. .

[0005]

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

[0006]

With the above construction, the elevating hood is formed in a substantially hermetic type in which the pipe is penetrated through openings formed on both end surfaces thereof and surrounds the circumference of the pipe for an appropriate length. The opening area of the hood is reduced, spray mist is prevented from scattering, and the air volume for collecting the mist is not required so much, and the blower capacity for collecting the mist may not be so strong. Can be reduced in size. When the elevating hood is further lowered, the tip nozzle of the spray gas is exposed from the elevating hood, and the exhaust duct on the elevating hood side is separated from the exhaust duct on the fixed side. Easy to do.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram illustrating the entirety of a tube outer surface thermal spraying apparatus according to one embodiment of the present invention. FIG. 2 is a front view of a main part of a partial cross section in a direction perpendicular to the longitudinal direction of the tube to be sprayed. FIG. 3 is a side view of a main part in a longitudinal direction of a tube to be sprayed.

In FIG. 1, reference numeral 11 denotes a movable carriage which moves along the length of a tube 1 to be sprayed on a gantry 12, and includes a spraying section main body 13 and a storage case 14 for storing a zinc wire as a spraying material. It is installed. The thermal spray unit main body 13 includes a fixed frame 15 fixed to the movable carriage 11 and an elevating frame 16 which can be moved up and down along the fixed frame 15. A guide tube 17 for guiding to the gun is attached, and an elevating hood 19 that is separable from a fixed side duct 18 fixed to the movable carriage 11 at the time of descending is attached to a tip of the elevating frame 16. Numerals 20 and 21 denote tube holding devices installed below both ends of the gantry 12. The tube 1 conveyed by the carrier carriage 22 and raised by the elevating table 23 is rotatable by the holding parts 24 and 25 from both ends. Hold to maintain the spraying attitude. The elevating hood 19 is a tube 1 held by the holding portions 24 and 25 of the tube holding devices 20 and 21.
Can be moved by the mobile trolley 11 in a state in which.

In FIG. 2 and FIG. 3, reference numeral 26 denotes a spray gun fixed to the lower end of the fixed frame 15;
The guide tube 1 is positioned opposite to the tube 1 held by the holding portions 24 and 25 and attached to the fixed frame 15.
7 is communicatively connected, and the zinc wire 27 guided in the guide tube 17 is melted by arc discharge, and the molten zinc is sprayed and sprayed on the outer surface of the tube 1 as a base material. Reference numeral 28 denotes a sprocket provided on the movable carriage 11 and driven by a motor 29. The tip of the chain 20 wound around the sprocket is connected to the lifting frame 16, and the lifting frame 16 is rotated by the motor 29 via the sprocket 28 and the chain 30. 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 performed smoothly.

The elevating hood 19 attached to the end of the elevating frame 16 has a tip nozzle 26a of the spray gun 26 at the upper limit position.
Are provided so as to pass through and face the internal space, and an opening 32 through which the tube body 1 held at the zinc spraying position penetrates is provided on both end surfaces of the lifting hood 19 in the moving carriage 11 moving direction. The elevating hood 19 is formed so as to be substantially closed so as to surround the periphery of the tube 1 having a suitable length. Further, end end exhaust ducts 33 respectively opening into the elevating hood 19 at both end surfaces where the opening 32 of the elevating hood 19 is provided extend upward along the outer surface of the elevating frame 16. A side surface exhaust duct 34 that opens into the elevating hood 19 at the side surface 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 fit externally into two end-face exhaust ducts 33 extending upward from both end faces of the elevating hood 19. And one side-side fixed exhaust duct 36 fixed to the movable carriage 11 so as to fit over one side-side 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 with the end face side fixed exhaust duct 35, and the side face exhaust duct 34 is configured to have a telescopic structure that fits shallowly with the side face side fixed exhaust duct 36. . Therefore, when the lifting frame 16 is lowered and the lifting hood 19 is lowered to the position indicated by the phantom line in FIG. 2 in a state where the pipe 1 is not penetrated, the end surface exhaust duct 33 of the lifting hood 19 is fixed to the end surface side. Although it does not separate from the exhaust duct 35, the side exhaust duct 34 separates from the side fixed exhaust duct 36, and the elevating hood 19 is separated from the fixed duct 18 at this point. At this time, the tip nozzle 26a of the thermal spray gun 26 penetrating the elevating hood 19 and facing the internal space is also exposed to the outside of the elevating hood 19, so that the side surface exhaust duct 34 and the side surface side fixed exhaust duct 36 The maintenance and inspection of the thermal spray gun 26 can be performed from a gap at a location separated from the thermal spray gun 26.

Two fixed exhaust ducts 35 on the end face side and one fixed exhaust duct 3 on the side face side fixed to the movable carriage 11.
Reference numeral 6 denotes a movable carriage 11 which is one of the exhaust ducts 37 shown in FIG.
The spray mist is collected in a book, and the spray mist is sucked by an appropriate blower (not shown). At this time, since the elevating hood 19 is constituted by a substantially closed narrow space except for the opening 32, a sufficient suction force can be obtained even if the blower has a relatively small blower capacity. The miniaturization of the apparatus can be easily achieved, and the spray mist can be sufficiently collected without being scattered.

Next, the operation of the tube outer surface thermal spraying apparatus having the above configuration will be described. Before holding the tube 1 by the holding portions 24 and 25 of the tube holding devices 20 and 21, the lifting hood 19 is raised to the upper limit position by the lifting frame 16, and
1, the lifting hood 19 is retracted through the opening 32 to the position shown in FIG. 1 where the distal end of one of the tubular body holding devices 20 including the holding portion 24 has penetrated. Next, the tube 1 conveyed by the conveyance carriage 22 and raised by the elevating table 23 is held by the holding portions 2 of the tube holding devices 20 and 21.
After being held rotatably by 4 and 26, the movable carriage 11 is advanced, the spraying gun 26 is operated, and the molten zinc is sprayed on the outer surface of the tube 1 penetrating through the elevating hood 19 and the blower is driven. The spray mist is sucked by the end face exhaust duct 33 and the side face exhaust duct 34. At this time, since the elevating hood 19 is substantially sealed, even with a relatively small blower capacity as described above, it is possible to sufficiently suck the sprayed material without scattering.

Next, when performing maintenance inspection of the spraying gun 26, the lifting frame 16 is lowered without holding the tube 1,
The tip nozzle 26a of the spray gun 26 is exposed to the outside of the elevating hood 19, and the side exhaust duct 34 of the elevating hood 19 is separated from the side fixed exhaust duct 36, and maintenance and inspection are performed from a gap generated at this location. .

[0014]

As described above, according to the present invention, the hood has a substantially hermetic type in which a tube is penetrated through openings formed on both end surfaces thereof and surrounds the periphery of the tube for an appropriate length. Therefore, the opening area of the elevating hood is reduced, so that the spray mist can be prevented from being scattered, and the blower ability for collecting the mist does not have to be so strong, and the apparatus can be downsized. Furthermore, when the hood is lowered, the nozzle of the spray gun tip is exposed from the elevating hood, and the exhaust duct on the hood separates from the fixed exhaust duct, making maintenance and inspection of the spray nozzle easy through this space. Can be done.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating the entirety of a tube outer surface spraying apparatus according to an embodiment of the present invention.

FIG. 2 is a front view of an essential part of a partial cross section in a direction perpendicular to a longitudinal direction of a tube to be sprayed by the tube outer surface thermal spraying apparatus.

FIG. 3 is a side view of a main part in a longitudinal direction of a tube to be sprayed of the tube outer surface thermal spraying apparatus.

FIG. 4 is a sectional front view and a sectional side view of a conventional tubular body outer surface thermal spraying apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 tube 11 movable carriage 15 fixed frame 16 elevating frame 19 elevating hood 20, 21 tube holding device 26 spray gun 32 opening 33 end face exhaust duct 34 side face exhaust duct 35 end face side fixed exhaust duct 36 side face side fixed Exhaust duct

────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yo Nagai 2-26-26 Ohama-cho, Amagasaki City, Hyogo Pref. Kubota Mukogawa Works (58) Field surveyed (Int. Cl. ⁶ , DB name) C23C 4/00

Claims (1)

(57) [Claims] A spraying gun installed at a lower end of a fixed frame fixed to a movable trolley; an elevating frame capable of moving up and down along the fixed frame; The tip nozzle of the gun penetrates into the internal space and has an opening through which the tube can penetrate on both end surfaces in the moving direction of the movable carriage, and the periphery of the tube penetrated through the opening has an appropriate length. An elevating hood formed so as to surround the hood, and a fixed-side exhaust duct fixed to the movable trolley, which is fitted into an elevating hood-side exhaust duct which is opened in the elevating hood and extends upward, A tubular body outer surface thermal spraying apparatus wherein the elevating hood-side exhaust duct is detachable 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.