JPS60229Y2 - Travel device for welding pipes, etc. with non-circular cross sections - Google Patents

Description

[Detailed explanation of the invention] Welding of piping that requires uniform high airtightness and high quality such as nuclear equipment and high vacuum equipment, welding of pipes in places where work time is limited under radiation control, and welding of pipes in narrow spaces. For pipe welding work where manual welding is difficult in a location, automatic welding equipment is used that has a welding traveling device that moves a torch along the welding line.

In the present invention, such a welding traveling device is adapted to be used for welding pipes and the like having a non-circular cross-sectional shape (for example, an oval, elliptical, etc. cross-sectional shape).

As shown in FIG. 1, a conventional welding traveling device used for welding pipes with a non-circular cross-section is provided with a perfectly circular circumferential raceway on the outside of a pipe a with a non-circular cross-section. A running cart d having drive wheels C is engaged with the circumferential track so as to sandwich the track from the inside and outside, and a torch e is attached to the running cart d so as to be movable in the direction of its axis and in the front-rear direction ( The welding line of the pipe a is welded using a torch e while the traveling trolley d, which is rotatably mounted in the traveling direction, is run along a circumferential track.

However, in the conventional device with the above configuration, in order to move the torch e at a desired speed along one welding line of the non-circular cross-section pipe a, it is necessary to movement (traveling speed) x, torch e
It is necessary to control three speeds: the forward and backward movement of the torch e (back-and-forth angular velocity) y, and the axial movement of the torch e (vertical speed) 2, and this is generally done electrically. However, electrical control requires complex mutual control of three speeds, which requires sophisticated control equipment such as computer control, which inevitably increases the cost of control equipment. .

■ Traveling speed of truck d X1 Front-rear angular velocity of torch e y
, a drive device is required to control the vertical speed X of the torch e, which increases the size and weight of the entire device and reduces workability.

Also, maintenance and inspection are complicated due to the large number of actuating devices.

There are other problems.

The present invention improves the longitudinal angular velocity of the torch in the conventional method described above.
This is an attempt to simplify, reduce weight, and reduce the size of the device without requiring a vertical speed control device, etc., and welding torches (
A main wheel and an auxiliary wheel are installed on the main body of the trolley, which is equipped with a control mechanism such as a torch, a travel motor, an automatic welding voltage adjustment motor, a wire, and a feed motor, and the torch is placed on the axis of the main wheel. The main wheel track and the auxiliary wheel track for guiding the main wheel and the auxiliary wheel are located at It is characterized by having the same circular orbits, and in the straight section, the main wheels and auxiliary wheels are formed so as to follow orbits parallel to the pipes, etc.

Embodiments of the present invention will be described below with reference to the drawings.

2 to 4 schematically show the configuration of an embodiment of the device of the present invention, in which a tube 1 having a non-circular cross-section has a shape similar to the cross-sectional shape of the tube 1 and a A traveling track body 2 is positioned which integrally has a main wheel raceway 3 having a diameter larger than that of the pipe 1 and a drive wheel raceway 4 having a larger diameter than the main wheel raceway 3 and having a front surface, for example, a rack. , the running track body 2 is tightened and held on the outside of the tube 1 by a track positioning holt 5.

In addition, when the cross-sectional shape of the pipe 1 having a non-circular cross-section is made up of a straight cross-section part S and a curved cross-section part T as shown in the figure, the main wheel raceway 3 and the drive wheel raceway 4 are the straight cross-section part of the pipe 1. In S, tube 1
A certain distance from the vehicle and a trajectory parallel to tube 1 as L2,
In addition, the curved cross section T of the tube 1 is a curved trajectory (radii R1 and R2) distant from the tube 1 by distances L1 and L2 with respect to the center of curvature O of the tube 1.
).

On the other hand, the main wheels 9 are attached to the bogie body 7 on which the welding torches 8 are mounted so as to roll along the respective both-side track surfaces at both ends of the main wheel track 3 extending in the front-rear direction of the running track body 2, A drive motor 10 is attached, and a drive wheel 11 having a gear structure that meshes with the drive wheel track 4 is attached to the shaft of the drive motor 10, and a torch 1 is attached to the front side of the truck body 7.
2, so that the main wheel 9, driving wheel 11, and torch 12 are on the same plane (X-X' plane) perpendicular to the welding line as shown in FIG. An auxiliary wheel 13 that can roll along a track surface of an auxiliary wheel track to be described later is attached at a position away from a plane perpendicular to the line and outside the drive wheel 11.

The above-mentioned auxiliary wheel track, as shown by reference numeral 6, is placed on the outer periphery of the traveling track body 2 so as to be further outward than the driving wheel track 4.
It is formed so as to protrude in the front and back direction as shown in the figure.
While the main wheel 9 moves on the main wheel track 3 in a portion parallel to the linear cross section S of the tube 1, the auxiliary wheel track 6 is formed in a straight line so that the auxiliary wheel 13 can also move parallel to the main wheel track 3. And the main wheel 9
is the radius R2 whose center of curvature is the same as the curved cross section T of the tube 1.
While moving along the main wheel track 3, the auxiliary wheel 13 also moves in a circular orbit with a radius R3 that makes the center of curvature the same, and in this case, the radius R of the main wheel track 3 and the radius of the auxiliary wheel track 6 The relationship of R3 is (R1+h) 2+l2=R:? from the parallel distance 1 and perpendicular distance between the main wheel 9 and the auxiliary wheel 13. Make it so that

Since the apparatus of the present invention has the above configuration, when welding a butt weld of a pipe 1 having a non-circular cross section, the main wheel 9 of the truck main body 7 is guided by the main wheel track 3 by the rotation of the drive wheel 11, and the torch 12 moves along the welding line and welding is performed.

In this case, in the present invention, the torch 12, the main wheel 9, and the drive wheel 1
1 are on the same vertical plane when viewed from the front, and the auxiliary wheel raceway 6 has a special shape, so that the torch 12 can always maintain a constant angle and distance from the welding line at any point. Moreover, the moving speed of the torch 12 can be determined by the rotational speed of the drive wheel 11, and complicated electrical control can be omitted.

Note that the present invention is not limited to the above-mentioned embodiments; for example, the main wheel may also serve as the driving wheel without providing the driving wheel 11 in addition to the main wheel 9; If the tube 1 with a non-circular cross section has a sharp corner, for example a rectangular cross section as shown in FIG. It can be similarly applied by making it an orbit.

Further, in the embodiment, the drive wheel raceway 4 is made larger in diameter than the main wheel raceway, and the auxiliary wheel raceway 6 is made outside the drive wheel raceway 4. It is fine as long as it has an unobtrusive structure.

As described above, according to the device of the present invention, (1) the torch always maintains a constant angle and distance to the welding line of the pipe with a non-circular cross section, so the longitudinal angular velocity of the torch compared to the conventional method, There is no need for a vertical speed control device or a drive device, and the entire device is simplified, making it lighter and smaller, and improving workability.

(11) Since the moving speed of the torch is determined by the rotational speed of the drive wheels, there is no need for complicated electrical control, and costs can be reduced.

(iii) Even if the cross-sectional shape of the pipe changes, automatic welding can be easily performed by creating a corresponding trajectory.

It can produce excellent effects such as

[Brief explanation of the drawing]

Fig. 1 is a front view schematically showing a conventional welding traveling device, Fig. 2 is a schematic front view showing the configuration of the welding traveling device of the present invention, and Fig. 3 is an enlarged view of the ■ section in Fig. 2. , FIG. 4 is a side view of FIG. 3, and FIG. 5 is a front view showing an example of application of the present invention. 1...Pipe with non-circular cross section, 3...Main wheel track, 4...Drive wheel track, 6...Auxiliary wheel track 7... ...Body body, 9...Main wheels,
11... Drive wheel, 12... Torch, 1
3... Training wheels.

Claims (1)

[Scope of utility model registration request] A main wheel and an auxiliary wheel are provided on a main wheel and an auxiliary wheel on a main wheel carrying a welding torch, and the torch is attached to the main wheel with the torch located on the axis of the main wheel, and the main wheel is used to guide the main wheel and the auxiliary wheel. The raceway and the auxiliary wheel raceway are circular orbits with the same center of curvature in non-straight sections such as pipes with non-circular cross-sections, and circular orbits with the same center of curvature in straight sections where the main wheels and auxiliary wheels are parallel to the pipe, etc. A traveling device for welding pipes and the like having a non-circular cross section, which is formed so as to follow a trajectory.