JPH0632852B2 - Steel bar surface fillet welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is intended to increase the shearing force when stiffening a steel pipe in a ring shape or when joining steel pipe piles having different diameters with a slaut material. The present invention relates to a device for welding a large number of fillets around the inner surface or the outer surface of a steel pipe.

(Prior Art and Problems) In the case of fillet welding a rod-shaped member temporarily attached to the surface of a steel pipe in the pipe circumferential direction, the conventional method has been manual welding or semi-automatic welding. At this time, from the viewpoint of welding stability and quality assurance, it was common to perform the steel pipe in a downward position while rotating it with a turning roller or the like.

However, this method is inefficient because only one welding torch can be operated for one welder, and in the case of inner surface welding of the pipe, the welder enters inside the pipe, so the work space is restricted and the temperature is high. However, there was a problem that the efficiency became worse.

As a solution to this problem, it has been considered to use the traveling carriage for fillet welding equipment disclosed in JP-A-54-5264. This device tries to improve work efficiency by attaching a guide roller that sandwiches the contact plate to a traveling carriage that mounts a welder that fillet welds the base material to the base material and performs welding without using a special track. It is a thing.

However, the guide system of this device has a mechanism that allows the guide rollers that sandwich the contact plate to move freely up and down, so that even with the temporary welding bead, it can pass without any problems.
If the rod-shaped member to be welded is round steel or has a low height, especially in the case of multi-layer welding, there is a drawback that the guide roller may come off the contact plate, and the number of guide rollers and traveling wheels complicates the device. There was a problem.

(Object and Structure of the Invention) An object of the present invention is to solve the problems of the prior art, to widen the target range of welding rods, and to provide a device that enables stable welding work efficiently with a simple mechanism. The structure is such that a plurality of rod-shaped members that are continuous in the circumferential direction on the surface (outer surface or inner surface) of the steel pipe and are arranged at intervals in the longitudinal direction of the pipe are used while rotating the pipe. In an apparatus for meat welding, a plurality of trolleys provided with two copying wheels provided with V-shaped grooves extending over a rod-shaped member at intervals in the member longitudinal direction are arranged in parallel in the pipe longitudinal direction, and The end of the connecting shaft 7 fixed to the dolly is connected to the other dolly through a mechanism that is rotatable about a vertical axis and a parallel slide mechanism in the pipe longitudinal direction so that each dolly is oriented in the welding direction. The special feature is that the holder that holds the welding torch is placed. This is a fillet welding device for bar material on the surface of steel pipes.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 9 and 10, the turning roller 15
V-shaped so as to straddle the rod-shaped member 2 temporarily attached to the inner surface (Fig. 10) or the outer surface (Fig. 9) of the steel pipe 1 placed on the surface of the steel pipe 1 at regular intervals along the circumference. The copying wheels 3 provided with the guide grooves 16 are arranged in series at two intervals. As shown in FIGS. 1 to 3, a plurality of carriages 4 each having wheels 3 rotatably attached to a support frame 4a by an axle 11 are arranged at intervals of the rod-shaped members 2 to be welded. To do.

The V-shaped groove 16 of the copying wheel 3 is shaped so as to abut at two points above the center line of the rod-shaped member 2 and is dimensioned so that the outer periphery of the wheel 3 does not come into contact with the pipe 1. A member 18 extending vertically upward is fixed to the upper surface of each carriage 4,
One end of the connecting shaft 7 is fixed to the upper end of one of them to form a fixed head A.

At the other end of the connecting shaft 7, as shown in FIG. It was slidably fitted into the member 6a. -Shaped member 6 is fixed, parallel slide is free, and The member 6a includes a member 5b fixed to the upper end of the member 18 and a pin.
The head B is rotatably and movablely connected by 5a so as to be horizontally rotatable.

The case 12b of the lifting / holding mechanism 12 of the welding torch is fixed to the member 6a, and the case 12b of the other lifting / holding mechanism 12 is attached to the upper end of the vertical member 18 provided on the upper portion of the carriage 4, and the case 12b is , A lid having a hole that penetrates the shaft 12a is provided at the upper end, and the shaft 12 is opened at the lower end.
a is inserted.

The shaft 12a sandwiches the lid, has a collar with a diameter larger than the through hole on the lower side, a knob 10 with a diameter larger than the through hole is attached to the upper side of the lid, and a spiral protrusion groove is provided on the lower side of the shaft 12a. The length of 19 is longer than the length of raising and lowering. Inside the case 12b is a slider 24 that slides along the inner wall.
The guide pin 12 is inserted from this slider 24.
By engaging c with the spiral protrusion groove 19, the knob 1
By rotating 0, the slider 24 can be moved up and down without rotating.

Below the slider 24, a member 12d that supports the horizontal sliding mechanism 13 of the welding torch is fixed. The horizontal slide mechanism 13 is provided horizontally orthogonal to the traveling direction of the copying wheel 3, and a knob 9 is attached to one end of a shaft 20 rotatably supported by the left and right ends of the case 13a.

In the middle of the shaft 20, spiral-shaped protrusions 19a, 19b are formed by reversing the winding directions by an appropriate length with an interval left and right.
Is provided on the side surface of the case 13a. Each of which is slidably fitted with the member 13b. The guide pin 22 protruding from the slider 23 is engaged with the spiral protrusion grooves 19a and 19b. In this way, by rotating the knob 9 in one direction, the interval between the left and right sliders 23 can be expanded or fitted without changing the center position. Below the slider 23, a holder 8b for holding the welding torch 8 is attached by a bolt 8a so as to be directed to the welding position of the bar 2 and to adjust the directional angle to an appropriate angle.

The fillet welding device configured as described above is attached to the support arm 14 fixed to the floor surface by a connection fitting 14a provided in the central portion of the connecting shaft 7 and rotatable in the circumferential direction.

Next, a method of welding a rod to the surface of a steel pipe using the fillet welding apparatus for a rod of the present invention will be described.

FIG. 9 and FIG. 10 show the situation in which rods are welded to the outer surface and inner surface of the steel pipe, respectively, and the procedure is as follows. First, the surface of the steel pipe mounted on the turning roller 15 (the outer surface or the inner surface). In addition, rods such as round steel or strip steel are temporarily attached to the circumference at regular intervals.

The fillet welding device 17 is placed in a posture slightly tilted from the horizontal state in the direction of rotation of the steel pipe 1, on which the wheels 3 are placed following the rods 2, and the support arm 14 fixed to the floor is provided with a circumferential direction. Attach it rotatably. When the steel pipe is rotated in the circumferential direction and is placed in a posture that is slightly inclined from the horizontal state, there is a distortion of the steel pipe and an error in the true circular orbit during rotation that occurs when the bar is not in close contact with the steel pipe. However, it is possible to copy the rod 2 always and the wheel 3 can copy stably.

Next, the angle of the holder 8b is determined and the bolt 8a is tightened so that the welding torch 8 has the most suitable directivity angle and position for fillet welding of the bar 2 and then the welding torch 8 is attached to the holder 8b and the knob Turn the knob 10 and the knob 9 to adjust the top, bottom, horizontal (space) so that the tip of the welding torch 8 is at the optimum position, and complete the preparation. When the preparation is completed, the turning roller 15 is started, and then the welding machine is turned on to start automatic welding.

When the welding of the first layer is completed on the entire circumference, the position of the welding torch 8 is adjusted and then the welding of the next layer is performed in the same manner as described above, and the required number of layers are welded. When the welding work is completed, the fillet welding device 17 is moved to the bar next, and the same procedure is performed.

In addition, when welding the bar material to both side fillets, two welding torches are arranged so as to sandwich one bar material, and in the case of one side fillet, one welding torch is provided for each trolley side. good.

Further, in the embodiment, an example in which two rods are welded at the same time is shown, but it is also possible to arrange the rotatable / movable heads B on both sides of the fixed-side head A and weld three rods at the same time. good.

(Effect) According to the present invention, the steel pipe 1 rotating by the turning roller 1
This is extremely efficient because a plurality of bars can be simultaneously fillet welded simultaneously by the copying wheel mounted on the bar-shaped member 2 temporarily attached at regular intervals in the circumferential direction.

Further, a plurality of trolleys, each having two copying wheels 3 provided with V-shaped grooves extending over the rod-shaped member 2 at intervals in the member longitudinal direction, are arranged in parallel in the pipe longitudinal direction, and one trolley Connecting shaft 7
Is fixed to the fixed head, and the other carriages are connected to the fixed head and the connecting shaft 7 through a mechanism that is rotatable about a vertical axis and a parallel slide mechanism in the pipe longitudinal direction. Even if the distance between the members 2 is not constant due to the mounting error of the rods or the accuracy of the parallelism is poor, the rotatable / movable side head B automatically moves over a plurality of rods as shown in FIG. Since the copying wheel can follow the target, it is possible to perform stable fillet welding without the tracking wheel coming off and to ensure good welding quality.

[Brief description of drawings]

1 to 10 show one embodiment of the present invention. FIG. 1 is a front view of a fillet welding device placed on a rod-shaped member, FIG. 2 is a plan view, and FIG. 1 is a side view seen from the AA side in FIG. 1, FIG. 4 is a sectional view taken along the line BB in FIG. 1, showing a rotating / moving side head, and an elevation holding mechanism diagram, and FIG.
6 is a sectional view taken along line CC of FIG. 6, FIG. 6 is a sectional view taken along line DD of FIG. 1, and is a rotary slide mechanism of a connecting shaft, and FIG. 7 is taken along line EE of FIG. It is a figure, a horizontal slide mechanism, FIG. 8 is an explanatory view of a copying mechanism, and FIG. 9 is an example in which this device is applied to welding a rod-shaped member to the outer surface of a steel pipe.
Figure 10 shows an example of applying this device when welding a rod-shaped member to the inner surface of a steel pipe. 1 ... Steel pipe, 2 ... Rod-shaped member, 3 ... Copying wheel, 4 ...
Cart, 7 ... Connection shaft, 8 ... Welding torch, 12 ... Lifting / holding mechanism, 13 ... Horizontal slide mechanism, 16 ... V-shaped guide groove, 17 ... Fillet welding device, A ... Fixed head , B …… Rotary movable head.

Claims (1)

[Claims] 1. An apparatus for fillet-welding a rod-shaped member, which is continuous on the surface (outer surface or inner surface) of a steel pipe in the pipe circumferential direction and is arranged at intervals in the pipe longitudinal direction, while rotating the pipe. In Fig. 2, a plurality of trolleys provided with two copying wheels provided with V-shaped grooves straddling a rod-shaped member at intervals in the member longitudinal direction are arranged in parallel in the pipe longitudinal direction, and are fixed to one trolley. The end of the connecting shaft 7 is connected to the other dolly through a mechanism that is rotatable about a vertical axis and a parallel slide mechanism in the pipe longitudinal direction, and a welding torch is held on each dolly so as to be oriented in the welding direction. A bar fillet welding device on the surface of a steel pipe, characterized in that a holder is installed.