JP2575433Y2 - Small diameter pipe inner surface welding equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small-diameter pipe inner surface welding apparatus applied to the inner surface welding of a small-diameter pipe having a bent portion.

[0002]

2. Description of the Related Art Various types of welding devices for welding the inner surface of pipes have been developed. However, pipes having a bent portion such as an elbow or a vent are intended for pipes of φ250 mm or more, and φ25 mm or more.
Welding of the inner surface of a pipe having a bent portion having a small diameter of 0 mm or less is not performed because the pipe cannot pass through the bent portion.

[0003]

[Problems to be Solved by the Invention] The present invention has been proposed in view of such circumstances, and it is possible to easily perform welding work even on a pipe having a small diameter and a bent portion, thereby reducing welding man-hours and reliability of the pipe. An object of the present invention is to provide a small-diameter pipe inner surface welding apparatus that can be improved.

[0004]

SUMMARY OF THE INVENTION For this purpose, the present invention provides a tubular flexible body having a diameter that can be inserted into a small-diameter pipe inner surface, an air clamp attached to a middle portion of the flexible body, and a tip of the flexible body. A rotatable ring gear disposed on the section and a centering mechanism comprising a plurality of claws meshing with the ring gear and protruding toward the inner surface of the pipe; and a centering mechanism connected via a cable to operate the centering mechanism and installed outside the pipe. A centering drive mechanism, a rotating body rotatably mounted inside the centering mechanism, a rotating drive mechanism connected via a cable to operate the rotating body, and installed outside the pipe; A small TIG welding torch provided on the body via a front-rear slide and an electric vertical slide, An oscillating drive mechanism connected via a cable to operate the cable, and installed outside the pipe, a visual fiber scope, a shield gas hose, and an energizing cable stored in the flexible body, and And a controller for remotely controlling the drive mechanism.

[0005]

In the small-diameter pipe inner surface welding apparatus of the present invention, the flexible body inserted into the small-diameter pipe is supplied with air into an air clamp, expanded and fixed to the inner surface of the pipe.
Next, the ring gear of the centering mechanism is rotationally driven by the centering drive mechanism, and a plurality of claws meshing with the ring gear are projected to the inner surface of the pipe to perform centering. Then, the rotating body mounted inside the centering mechanism is operated by the rotation drive mechanism. Since the small TIG welding torch is provided on the rotating body via the front and rear slide and the electric vertical slide, the required welding speed and the vertical position can be adjusted by the electric vertical slide, and further, the front and rear slide by the oscillating drive mechanism can be performed. Axial oscillation in operation is also possible. In addition, while performing these operations, the welding operation is performed by performing appropriate energization with the shielding gas while monitoring with a fiber scope.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention small-diameter pipe inner surface welding apparatus will be described with reference to the drawings. FIG. 1 is an overall schematic diagram of the apparatus.
2 is a side view of an insertion portion in the pipe, FIG. 3 is a vertical cross-sectional view of the distal end portion, FIG. 4 is a transverse cross-sectional view along IV-IV in FIG. 3, and FIG. 5 is a plan view of the distal end portion. First, an overall configuration will be outlined with reference to FIGS. 1 and 2. Reference numeral 1 denotes a small-diameter pipe having an elbow 1a, which is a small-diameter tubular body which can be inserted into the small-diameter pipe 1 and can be freely bent. Inserted. An air clamp 3 whose rubber is inflated by air is attached to a middle portion of the flexible body 2, and a centering mechanism 4 is provided at a distal end portion. Inside the centering mechanism 4, a rotating body described later is provided, and a small TIG welding torch 7 is attached to the rotating body via a front-rear slide 5 and a vertical slide 6 so as to be located at the tip of the flexible body 2. The centering mechanism 4 is connected to the centering mechanism 4 via a control cable 11.
And a rotary drive mechanism 9 outside the pipe is connected to the rotating body in the centering mechanism 4 via a control cable 11. An oscillating drive mechanism 10 outside the pipe is connected to the front-rear slide 5 via a control cable 11. A controller 12 is provided outside the pipe, and is connected to the centering drive mechanism 8, the rotation drive mechanism 9, and the oscillate drive mechanism 10, respectively. Further, a welding power source 13 and a shielding gas 14 are connected to the small TIG welding torch 7 through the inside of the flexible body 2. A CCD camera equipped with a filter is connected to a monitor 16 outside the pipe.

Next, details of the centering mechanism 4, the front and rear slide 5, the vertical slide 6 and the small TIG welding torch 7 will be described with reference to FIGS. 3 to 5. The centering mechanism 4 is composed of an inner frame 17, an outer frame 18 and a rear frame 19. A gap is provided between the inner and outer frames 17 and 18, and three claws 20 and a ring gear 21 are combined and mounted. The ring gear 21 can freely rotate on the outer periphery of the inner frame 17, One end is connected to the control cable 11, and the other end of the control cable 11 is connected to a centering drive mechanism 8 operated by an air cylinder outside the pipe. The three claws 20 respectively meshing with the ring gear 21 extend, and the tips are directed to the inner surface of the small-diameter pipe 1. Centering by can be carried out.

A rotating body 23 is fitted on the inner peripheral surface of the inner frame 17 via a dry bearing 22, and two V-grooves are formed on the outer peripheral surface of the rotating body 23 along the circumferential direction. A control cable 11 having one end connected to a rotary drive mechanism 9 driven by an electric motor is wound around and connected to the V-groove in the opposite direction. The pulling of the control cable 11 causes the rotating body 23 to move inside the inner frame 17. The small TIG welding torch 7 which rotates smoothly and is attached to this tip can obtain any welding speed. A front-rear slide 5 is mounted inside the rotating body 23, and a vertical slide 6 is mounted thereon. The front-rear slide 5 is also controlled by an oscillation drive mechanism 10 operated by an electric motor.
By pulling 1, the centering mechanism 4 operates,
When it is loosened, it returns to its original state due to the restoring force of the spring 24, and becomes oscillated during welding by repeating this operation.

A rack gear 25 is provided on the vertical slide 6 and can be moved up and down through a flat gear 28 by a DC motor 27 held by a motor holder 26 attached to the front and rear slide 5, and the welding is performed by feedback control of the arc voltage. The small TIG welding torch 7 is set at a constant height.
A limit sensor 29 is provided at the upper and lower ends of the vertical slide 6.
To protect the small TIG welding torch 7 from interference with the inner surface of the pipe. The small TIG welding torch 7 includes a shield cup 30, a gas lens 31, an electrode 32, a collet 33,
Shield gas 1
Reference numeral 4 denotes a shield gas hose 35, which is supplied to the small TIG welding torch 7 through the flexible body 2 and the rotating body 23. The welding current is also supplied from the welding power source 13 outside the pipe by the power cable 36.

In such a device, the flexible body 2 inserted into the small-diameter pipe 1 sends air to the air clamp 3 and inflates the flexible body 2 so as to be fixed to the inner surface of the pipe. Next, the ring gear 21 of the centering mechanism 4 is rotationally driven by the centering drive mechanism 8, and the three claws 20 meshing with the ring gear 21 are projected to the inner surface of the pipe to perform centering.
The rotating body 2 mounted inside the centering mechanism 4
3 is operated by the rotation drive mechanism 9. Since the small TIG welding torch 7 is provided on the rotating body 23 through the front and rear slide 5 and the electric vertical slide 6, the required welding speed and the vertical position can be adjusted by the electric vertical slide 6, and furthermore, the oscillating drive is performed. Front and rear slide 5 by mechanism 10
The operation in the above also enables the axial oscillation. While performing these operations, the welding operation is performed by supplying the shield gas and performing appropriate energization while monitoring with the fiber scope 15. Thus, according to this apparatus, it is possible to weld the inner surface of the small-diameter pipe 1 having the elbow 1a, which has not been conventionally performed, and it is possible to reduce the number of welding steps and improve the reliability of the pipe.

[0011]

In summary, according to the present invention, a tubular flexible body having a diameter that can be inserted into the inside of a small-diameter pipe, an air clamp attached to the middle of the flexible body, and a distal end of the flexible body are provided. A centering mechanism including a rotatable ring gear and a plurality of claws that mesh with the ring gear and protrude toward the inner surface of the pipe; and a centering that is connected via a cable to operate the centering mechanism and that is installed outside the pipe. A drive mechanism, a rotary body rotatably mounted inside the centering mechanism, a rotary drive mechanism connected via a cable to operate the rotary body and installed outside the pipe, and Operates the small TIG welding torch provided via the slide and the electric vertical slide, and the front-back slide An oscillating drive mechanism connected via a cable and installed outside the pipe, a visual fiber scope, a shield gas hose and an energizing cable housed in the flexible body, and each of the drive mechanisms installed outside the pipe. By providing a remote-operated controller, it is possible to easily perform welding work even on pipes with small diameters and bent parts, and to obtain a small-diameter pipe inner surface welding device that can reduce welding man-hours and improve pipe reliability. Is extremely useful in industry.

[Brief description of the drawings]

FIG. 1 is an overall schematic view of one embodiment of a small-diameter pipe inner surface welding apparatus of the present invention.

FIG. 2 is a side view of a part inserted into a pipe of the same device.

FIG. 3 is a longitudinal sectional view of a tip portion.

FIG. 4 is a transverse sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a plan view of a distal end portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Small diameter piping 1a Elbow 2 Flexible body 3 Air clamp 4 Centering mechanism 5 Front and rear slide 6 Vertical slide 7 Small TIG welding torch 8 Centering drive mechanism 9 Rotation drive mechanism 10 Oscillate drive mechanism 11 Control cable 12 Controller 13 Welding power 14 Shield gas 15 Fiberscope 16 Monitor 17 Inner frame 18 Outer frame 19 Rear frame 20 Claw 21 Ring gear 22 Dry bearing 23 Rotating body 24 Spring 25 Rack gear 26 Motor holder 27 DC motor 28 Flat gear 29 Limit sensor 30 Shield cup 31 Gas lens 32 Electrode 33 Collet 34 Electrode holder 35 Shield gas hose 36 Power cable

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Norio Akito 1-1-1 Wadazakicho, Hyogo-ku, Kobe Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (56) References JP-A-3-8576 (JP, A JP-A-7-1129 (JP, A) JP-A 6-34868 (JP, U) JP-A 3-14074 (JP, U) JP-A 5-9762 (JP, U) Field (Int.Cl. ⁶ , DB name) B23K 37/02 301 B23K 9/028 B23K 9/29

Claims (1)

(57) [Scope of request for utility model registration] 1. A tubular flexible body having a diameter that can be inserted into the inner surface of a small-diameter pipe, an air clamp attached to a middle part of the flexible body, and a rotatable ring gear disposed at a distal end of the flexible body. A centering mechanism including a plurality of claws that mesh with the ring gear and protrude toward the inner surface of the pipe; a centering drive mechanism connected via a cable to operate the centering mechanism and installed outside the pipe; and the centering mechanism. A rotatable body rotatably mounted inside, a rotating drive mechanism connected via a cable to operate the rotatable body and installed outside the pipe, and a front-back slide and an electric up-down slide on the rotatable body. And a small TIG welding torch provided with Oscillating drive mechanism connected outside the pipe and installed, the visual fiber scope, shield gas hose and energizing cable stored in the flexible body, and a controller installed outside the pipe and remotely controlling each of the drive mechanisms A small-diameter pipe inner surface welding apparatus characterized by comprising: