JPS6331302B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding device that automatically performs circumferential welding of pipes, cylinders, and similarly shaped bodies (hereinafter referred to as tubular bodies).

A conventional tube circumference welding device is shown in FIG. In Fig. 1, 11, 11', 11'', 11 are stands installed on the floor. 12, 12' are stands 11, 11'', 11 are stands installed on the floor.
11', 11'', 11 are the tubes to be circumferentially butt welded, and 13 is the bevel.1
4 and 14' are divisible guide rails attached to the pipe 12', and 15 and 15' are guide rails 1 and 15'.
This is a rack that is part of 4,14'. 16 is a tightening bolt. Reference numeral 17 is a truck with a built-in motor, gears, etc., and 18 and 18' are guide rollers attached to the truck. Although only two guide rollers are shown in the figure, four guide rollers are attached to the cart 17. 19 is an arm fixed to the truck 17, and 20 is a welding torch attached to the arm 19.

In this device, frames 11, 11', 11'',
The circumferential welding of pipes 12 and 12' installed in 11 is as follows:
The divided guide rails 14, 14' are assembled on the outer periphery of the pipe, and the guide rails 14, 14' are fixed to the pipe 12' with tightening bolts 16, 16'.
The truck 17 is attached to the guide rail 14 by guide rollers 18, 18', and the pinion is rotated by the motor built in the truck 17.
By engaging with a rack 15 which is a part of the guide rail 14, the carriage 17 and the welding torch 20 attached thereto are moved along the welding groove 13.

Another example of a conventional pipe circumference welding device is shown in FIG. In Fig. 2, 21, 21', 21'',
21 is a pedestal as in Fig. 1, 22 and 22' are pipes,
23 is a welding groove, 25 is a chain, 26, 26'
is a sprocket, 27 is a trolley, 28 is a wheel, 29
is an arm, and 30 is a welding torch.

In this device, a chain 25 goes around the tube 22' and is fitted into a sprocket 26. When the spockets 26, 26' are rotated by the motor built in the trolley 27, the chain 25 does not move due to frictional resistance with the pipe 22', so the trolley 2
7 moves along the surface of the tube 22' via the wheels 28, the welding torch 30 also moves along the welding groove 23, and welding progresses.

In this way, conventional pipe circumference welding equipment attaches rails or carts directly to the surface of the pipe, but in the case of high-strength steel pipes or alloy steel pipes, it is necessary to open the weld of the pipe to prevent cracks from occurring in the welded part. It was necessary to preheat the area near the welding tip to a temperature of several hundred degrees in some cases, and it was extremely difficult to install the welding equipment in such conditions, and the installation work was accompanied by danger. In addition, because the rails or carts were directly attached to the high-temperature tubes, heat was easily transferred to the carts that housed electrical components such as motors, significantly shortening the useful life of these electrical components.

In view of the above circumstances, the present invention aims to make it easier and safer to install a welding device, and to make it difficult for the heat from the high-temperature pipe to be transmitted to the cart, thereby extending the service life of the device. Split annular guide rails arranged at intervals on the outer circumferential surface of a tubular body, a rotary table that fixes the guide rails in a posture with their axes perpendicular to each other, and rotates the rotary table around a vertical axis. Provided is a circumferential welding device comprising: a tilting table on which the tilting table can be placed; a truck supporting the tilting table so as to be tiltable around a horizontal axis; and a welding torch movably supported on the guide rail. do.

Therefore, in the device of the present invention, the annular guide rails are spaced apart from each other on the outer peripheral surface of the tubular body, that is, the guide rails are not attached to the tubular body but are independent, thereby cutting off the heat transfer path. The installation work of the welding torch can be made easy and safe, and since the heat from the high-temperature tubular body is less likely to be transmitted to the welding torch support mechanism, the service life of electrical parts etc. can be significantly extended. The device of the present invention includes a rotary table that fixes and supports guide rails in a position where their axes are orthogonal to each other, a tilted table on which the rotary table is placed rotatably around a vertical axis,
Since a truck is provided to support the tilting table so as to be tiltable around the horizontal axis, the position of the guide rail can be easily adjusted, and welding work can be performed quickly and reliably.

An embodiment of the circumferential welding apparatus of the present invention will be described with reference to FIG. Reference numerals 32 and 32' denote pipes which are butt welded around the circumference and are arranged on a frame (not shown). 3
3 is a welding groove, 34, 34' is a guide rail that is combined into an annular shape and has a larger diameter than the pipes 32, 32', 3
5 and 35' are racks fixed to the guide rails 34 and 34', respectively, and 36 is a rack fixed to the guide rails 34 and 3.
4' is a hinge that rotatably supports each other; 37 is a truck movably mounted on the guide rails 34, 34'; 38, 38' are guide rollers; 39 is an arm fixed to the truck 37; 40 is a The welding torches 41 and 41' held by the arms 39 are attached to the pipes 32 and 41' on the floor.
Rail laid in the same direction as 32', 42,4
2', 42'', 42 are wheels disposed on the rails 41, 41', 43 are wheels 42, 42', 42'',
Rectangular truck frame placed on 42, 44,4
4', 44'', 44 are legs arranged to be able to rise and fall on the sides of the bogie frame 43 orthogonal to the rails 41, 41'; 45, 45', 45'', 45 are legs 44, 4.
4', 44'', 44 are drawer wheels arranged at the bottom, 46, 46', 46'', 46 are legs 44, 4
4', 44'', screws rotatably attached to 44 and screwed into screws of the truck frame 43, 47, 47',
47″, 47 are screws 46, 46′, 46″, 4
A handle is fixed to 6, slide bars 48 and 48' are fixed to the truck frame 43, 49 is a movable table slidably attached to the slide bars 48 and 48', and 50 is rotatable on the truck frame 43. a feed screw attached to and screwed into the screw of the moving table 49;
51 is a fulcrum fixed to both ends of the rail on one side of the movable table 49; 52 is a tilting table rotatably attached to the movable table 49 at the fulcrum 51; and 53 is a tilting table 5.
2, a tilted screw screwed onto the other side of 2 and whose tip is in contact with the movable table 49; 54, a pin fixed approximately in the center of the tilted table 52; 55, a rotary table pivotally attached to the pin 54; 56, a rotating table; A gear 5 rotatably mounted on the tilting table 52 and screwed into a gear on the circumference of the rotary table 55.
7, 57' is a cylinder fixed to the rotary table 55;
58 is a screw fixed to the guide rails 34, 34', and 59 is a nut screwed onto the screw 58.

In this device, the tubes 32, 32' are mounted on a frame (not shown), for example 11, 11', 1 in FIG.
It is supported by frames such as 1'' and 11.
To set the welding device on this pipe welding section, the guide rail 34' is placed in the guide rail 34'' position with the hinge 36 as the center, and then the handle 47,
47', 47'', 47 pull out wheel 4
5, 45', 45'', and 45, move the device on the floor and set it on the pipe welding section.Next, similarly turn the handle 47 to retract the drawer wheel 45, and move the wheel 42 onto the rail 41. Further, by returning the guide rail 34'' to the position shown at 34', an annular guide rail is formed around the welding groove 33. By rotating the screw 53, the inclination angle of the tilting table 52 changes, and the inclination angle of the rotating table 55 and guide rails 34, 34' thereon changes, and by rotating the gear 56, the rotating table 55 rotates. The guide rails 34, 34' also rotate. Also, when the nut 59 and feed screw 50 are rotated, the guide rail 3
4, 34' move vertically and horizontally in parallel.

An annular guide rail is formed around the groove 33 by the guide rails 34 and 34' at a distance from the outer surface of the tube, and the surface of this guide rail including the annular ring is used to move the screw 53 and the gear 56. Therefore, it is possible to make it parallel to the plane including the annular welding groove 33. Next, by rotating the nut 59 and the feed screw 50, the guide rail 3
It is possible to align the center point of the torus 4, 34' with the axis of the tube 32, 32'. In this state, trolley 37
By operating the motor and pinion built in, the trolley 37 moves along the guide rails 34, 34'.
The welding torch 40 moves along the welding groove 33, and by supplying current and wire from a welding power source (not shown), circumferential welding is completed. As explained above, the device of the present invention comprises a split annular guide rail which is installed by a separate holding mechanism independent of the tubular body to be welded, with a space interval defined from the outer surface of the pipe, and the guide rail. a rotary table that fixedly supports the rotating table with their axes perpendicular to each other, a tilting table on which the rotary table is rotatably mounted around a vertical axis, a trolley supporting the tilting table so as to be tiltable around a horizontal axis, and the guide rail mentioned above. The structure consists of a movably supported welding torch and a movably supported welding torch, making it easy and safe to attach to high-temperature pipes, and because heat from the high-temperature pipes is less likely to be transmitted to the welding torch support mechanism, electrical components It has the advantage of significantly extending the service life of.

[Brief explanation of the drawing]

1 and 2 are schematic diagrams of a conventional circumferential welding device, and FIG. 3 is a schematic diagram of an embodiment of the circumferential welding device of the present invention. 32, 32': Pipe, 33: Bevel, 34, 34':
Guide rail, 37: Dolly, 38: Guide roller, 40: Welding torch, 49: Moving table, 52: Inclined table, 55: Rotating table.

Claims (1)

[Claims] 1. A split-type annular guide rail arranged on the outer peripheral surface of the tubular body to be welded by a separate holding mechanism that is independent of the tubular body to be welded with a specified space interval, and the guide rails are aligned with each other on the axis. A rotary table fixedly supported in an orthogonal position, a tilting table on which the rotary table is rotatably placed around a vertical axis, a trolley supporting the tilting table so as to be tiltable around a horizontal axis, and movable on the guide rail. A circumferential welding device comprising a supported welding torch.