JPH0120071Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an automatic welding device, and particularly to an automatic welding device that can automatically and continuously perform welding work along the circumference of a square pipe.

[Background technology] Conventionally, for example, the work of welding and attaching square pipe columns to a ceiling surface at a construction site has been difficult to automate because the weld line bends suddenly at the four corners of the square pipe, and has been carried out by hand. Ta.

However, when welding a square pipe to the ceiling,
Inevitably, the welding position will be upward, resulting in an unstable position. For this reason, welding work is difficult even for experienced workers, and defects and unevenness are likely to occur in the welded area, and work efficiency is inevitably low.

[Purpose of the invention] Taking the above facts into consideration, the present invention is capable of automatically and continuously stably welding the circumference of a square pipe even when the welding position is upward, thereby significantly saving labor in welding work. It is an object of the present invention to provide an automatic welding device capable of achieving good welding quality of welded parts.

[Structure of the invention] The automatic welding device according to the invention includes a linear guide part corresponding to one side of the square pipe and a curved guide part corresponding to the corner part of the square pipe, and a guide that can be attached and detached from the square pipe. , a straight rail formed along the circumferential direction of the square pipe in the straight guide part, a curved rail formed in the curved guide part so as to follow the circumferential direction of the square pipe, and running in the guiding direction of the guide. It has a freely mounted traveling device, a linear drive wheel that abuts the straight rail to drive the vehicle, and a curved drive wheel that has a larger diameter than the linear drive wheel and that abuts the curved rail to drive the vehicle. and a drive device provided on the traveling device, the traveling device is equipped with a welding torch connected to an external welding device main body, and the tip of the welding torch is placed at a predetermined position near the welding line of the square pipe. It is characterized by extending to

According to the present invention, the traveling device is equipped with a welding torch connected to an external welding device main body.
The tip of this welding torch extends to a predetermined position near the weld line on the surface of the square pipe. Therefore, a traveling device equipped with a welding torch runs on its own along a guide placed around the square pipe, automatically and continuously welding a square weld line, such as at the contact area between the ceiling surface and the square pipe. Can be welded. Since the tip of the welding torch is reliably held at a predetermined distance and angle from the welding line while traveling, stable welding work is possible even if the welding position is upward. Two drive wheels with different diameters are installed, and one of the drive wheels is used to drive the vehicle depending on where the traveling device travels, so the curved guide section corresponding to the corner of the square pipe can be moved faster than the straight guide section. It is possible to prevent a decrease in the welding speed at the corners of the square pipe by running the welding pipe, thereby achieving good welding quality over the entire weld line.

[Embodiment of the invention] An embodiment of the invention will be described below with reference to FIGS. 1 to 6.

FIG. 1 is an overall perspective view, with some parts omitted, showing how the automatic welding device according to the present invention is used. In the figure, an embedded metal fitting 12 is embedded flush with a concrete ceiling 10. This embedded hardware 12
A columnar square pipe 14 to be welded to the embedded metal fitting 12 is erected on the lower side, and the upper end of the square pipe 14 is in contact with the embedded metal fitting 12 in a T-shape. A rectangular weld line 16 is formed along this abutting portion.

A rectangular frame-shaped guide 18 is attached to the outer periphery near the upper end of the square pipe 14 and a predetermined distance downward from the embedded metal fitting 12 so as to be parallel to the weld line 16. The guide 18 has a substantially H-shaped cross section on one side as shown in FIG. 2, and is made up of a pair of left and right halves divided in the middle.

To attach the guide 18 to the square pipe 14, first sandwich the square pipe 14 between two half-split members, and insert the pin fitting portions 2 formed at both ends of the outer frame 24 of the half-split members.
6 are connected, both ends of the inner frame 20 of the half-split member are fastened with bolts 28. To remove it, just do this in reverse.

When the guide 18 is attached to the square pipe 14, the inner frame 20 is in close contact with the surface of the square pipe 14 over the entire circumference. On the other hand, the outer frame 24 includes a linear guide portion 30 corresponding to one side of the square pipe 14 and a curved guide portion 32 formed in a rounded shape that smoothly continues to the linear guide portion 30 corresponding to the corner of the square pipe 14. It is formed so that the distance from the surface of the square pipe 14 is constant at any location. This outer frame 24 is for guiding a self-propelled welding section 34, which will be described later.

On the lower side of the outer frame 24, the lower end of a linear guide portion 30 is bent outward in the horizontal direction to form a linear rail 36 having an L-shaped cross section. Further, at the corner of the outer frame 24, a lower end portion of the curved guide portion 32 is projected outward in the horizontal direction, and a quarter-ring shaped curved rail 38 is formed one step higher than the straight rail 36. The bent end of this curved rail 38 extends to the outside of the straight rail 36 when viewed from above.

The outer frame 24 of the guide 18 formed in this manner is equipped with a self-propelled welded portion 34 so as to be movable along the circumferential direction. This self-propelled welding section 34 is connected to the traveling device 4
0, welding torch 4 on drive device 42 and traveling device 40
4, and a position adjustment device 46 provided via a. (Figure 2).

The traveling device 40 includes a pair of left and right outer guide rollers 50 that are vertically supported on the front side of the main body 48 and abut against the outer surface of the outer frame 24 (see FIGS. 4 and 6).
The arm 52 is rotatably supported in a horizontal plane from the upper end of the main body 48, and is supported vertically and downwardly at the substantially central part of the arm 52, and is positioned between the two outer guide rollers 50 on the inner surface of the outer frame 24. It has an inner guide roller 54 (see FIGS. 2 and 4) that comes into contact with the corresponding portion.

A tension spring 56 is stretched between the rotating end of the arm 52 and the upper end of the main body 48, and the outer guide roller 50 and the inner guide roller 54 press against each other with the outer frame 24 in between, and the linear guide portion 30, It is designed to be able to travel smoothly and reliably on the curved guide portion 32.

A load-receiving roller 58 that contacts the upper end of the outer frame 24 and supports the load of the entire self-propelled welding section 34 is horizontally supported at the upper end of the main body 48, which is located between the two outer guide rollers 50.

A driving device 42 is provided below the traveling device 40 to drive the self-propelled welding section 34 to travel along the guide 18. This drive device 42 has a pair of left and right connecting rods 60 that are provided outside the outer guide roller 50 and that penetrate the main body 48 and are slidable in the vertical direction.
is attached to the bottom end of the.

At the upper part of the main body 48 of the connecting rod 60 is a nut 64 that presses a washer 62 as a spring seat from above.
are screwed together. A compression spring 66 is interposed between the washer 62 and the main body 48, and the traveling device 4
0, the drive device 42 is constantly pulled upward.

The drive device 42 is provided with a support 68 fixed to the lower end of the connecting rod 60 and a shaft 70 that is pivoted forward and horizontally on the support 68 near the rectangular pipe 14. The shaft 7 is attached to a small diameter linear drive wheel 72 and a curved rail 38 that abut from the side.
A curved drive wheel 74 having a larger diameter than the linear drive wheel 72 that is coaxial with the 0 and is provided at the rear and abuts from below, and a motor 78 that is attached to the support body 68 with bolts 76.
It has a worm 80 and a worm gear 82 that transmit the driving force of the motor 78 to the shaft 70.

Here, the linear drive wheels 72 and the curved drive wheels 74 receive the biasing force of the compression spring 66 to move the linear rail 3
6. Pressed against curved rail 38.

The motor 78 rotates at a constant speed while the vehicle is running. When the self-propelled welding section 34 is in the linear guide section 30, the linear drive wheel 72 contacts the linear rail 36 and drives the linear rail 36 to run from one end to the other end at a predetermined speed depending on the welding speed.

When the self-propelled welding section 34 approaches the curved guide section 32, the straight rail 36 is broken at this point, so the linear drive wheel 72 separates from the straight rail 36, and the curved drive wheel 74 now hits the curved rail 38. The curved rail 38 is driven to run from one end to the other end at a speed proportional to the diameter of the curved drive wheel 74. As a result, the welding speed for the welding line 16 at the corner of the square pipe 14 can be adjusted to
The welding speed can be made to match the welding speed on the straight part of one side. That is, when the radius of the weld line 16 at the corner of the square pipe 14 is R, and the diameter of the linear drive wheel is 2r, the radius of the curved rail is NR (N is a constant), and the diameter of the curved drive wheel is
If it is 2rN, the welding speed will be constant between the straight section and the curved section.

When the self-propelled welding section 34 approaches the linear guide section 30, the curved drive wheel 74 separates from the curved rail 38, and the linear drive wheel 72 comes into contact with the linear rail 36 again, continuing the traveling drive.

Note that the ends of the straight rail 36 and the curved rail 38 slightly overlap each other when viewed from above.
When the drive wheels are switched, the running drive continues without interruption (see FIG. 5).

The support body 68 is provided with rail press rollers 88 and 90 that are pivotally supported by arms 84 and 86 in correspondence with the linear drive wheels 72 and the curved drive wheels 74,
The linear rail 36 or the curved rail 38 is brought into contact with the linear drive wheel 72 or the curved drive wheel 74 from the opposite side to enable smooth running.

Drive control of the motor 78 is performed by an externally provided control device of the welding apparatus main body (not shown). This welding control device includes an inner frame 20 of the guide 18.
A limit switch 92 (FIG. 2) mounted at one location and activated by contact with the inner guide roller 54 is connected thereto. The welding control device is energized by the switch signal output of the limit switch 92 and performs controls such as starting and ending welding.

A welding torch 44 is installed on the outside of the traveling device 40 via a position adjustment device 46 . That is, the welding torch 44 is first held by the holder 94 and then bent diagonally upward toward the welding line 16, with the tip extending to a position near the welding line 16 at a predetermined distance.

The holding body 94 is provided with four pillars 96 at four upper and lower positions on both sides so as to be slidable in the front-rear direction. The front end of this support column 96 is implanted in the slide base plate 98, and the rear end thereof is fitted with a press plate 100 and fixed with a nut 102.

The slide board 98 is the main body 48 of the traveling device 40.
The torch is mounted on a vertical guide 104 formed at the rear of the torch so as to be movable up and down. A wedge-shaped dovetail tenon 106 and a wedge-shaped mortise 108 are provided at the center of each sliding surface of the slide substrate 98 and the main body 48, and are fitted into each other. Further, the lower end of the torch vertical guide 104 is bent rearward into an L-shape, and this bent portion 110
A vertical adjustment screw 112 is vertically connected to the vertical adjustment screw 112, which is rotatable while restricting axial movement.

The upper half of the vertical adjustment screw 112 is the slide board 9
It is screwed upward into the center of 8. By turning this vertical adjustment screw 112, the vertical position of the welding torch 44 can be adjusted.

Further, a longitudinal adjustment screw 114 is screwed into the center of the presser plate 100 in the horizontal direction. The tip of this longitudinal adjustment screw 114 is rotatably and securely connected to a metal fitting 116 attached to the center of the holder 94. And the front and rear adjustment screw 114
The forward and backward position of the welding torch 44 can be adjusted by turning.

The welding torch 44 is connected to an external welding device main body. This welding device main body is equipped with a welding wire, a wire feeding device, a gas cylinder, a welding power source, a welding control device, etc., and it applies a welding voltage to the welding wire and feeds it out from the tip of the welding torch 44, and also supplies gas for atmospheric isolation. The wire is melted and welded by the arc that is generated between the welding part and the welding part.

Next, the operation of the above embodiment will be explained.

A guide 18 is attached to a predetermined location of the square pipe 14 near the embedded metal fitting 12, and then a self-propelled welding part 34 is set on this guide 18. At this time, the position between the tip of the welding torch 44 and the welding line 16 is adjusted by turning the vertical adjustment screw 112 and the longitudinal adjustment screw 114.

Next, the welding control device causes the motor 78 to rotate at a constant speed. Then, the linear drive wheel 72 moves to the linear rail 3.
Alternatively, the curved drive wheel 74 rotates while pressing against the curved rail 38, and the self-propelled welding part 34 guided by the outer guide roller 50, the inner guide roller 54, and the load receiving roller 58 is driven to run along the guide 18. Ru.

The inner guide roller 54 is the limit switch 92
When the actuator 118 is pressed, the welding control device is energized by the switch signal output from the inner guide roller 54 and starts feeding out the welding wire from the welding torch 44 and blowing out the cutoff gas, and adjusts the welding voltage to the welding wire and welding. Apply voltage between parts,
Start welding.

During welding, the linear drive wheel 72 runs along the straight rail 36 and the curved drive wheel 74 runs along the curved rail 38, so that the tip of the torch 44 performs the same weld on the welding line 16 over the entire welding line 16. Move with speed.

Welding progresses along the circumference of the square pipe 14 and when the entire weld line 16 is welded, the inner guide roller 5
4 presses the actuator 118 of the limit switch 92 again, and the welding control device is energized by the output switch signal to stop the welding operation and stop the self-propelled welding section 34 from running.

Then, the self-propelled welding portion 34 and guide 18 are removed and moved to the next welding location, and welding is performed in the same manner.

Alternatively, a straight rail and a curved rail may be provided separately, and each rail may be provided with a drive wheel driven by a separate motor so as to rotate at different speeds.

Further, a position adjustment device using a screw or the like may be provided between the square pipe and the guide so that the guide can be accurately mounted in a predetermined mounting state regardless of the dimensional tolerance of the square pipe.

Furthermore, the automatic welding device according to the present invention may be used to weld square pipes together with the welding torch in a horizontal position, and the welding torch may be used for gas welding such as oxygen acetylene, continuous welding, etc. Spot welding may be used.

[Effects of the invention] As explained above, in the automatic welding device according to the invention, the traveling device equipped with a welding torch moves by itself along the guide arranged around the square pipe, thereby welding the ceiling surface and the square pipe. It is possible to automatically and continuously weld rectangular weld lines, such as the abutting parts of Since the tip of the welding torch is reliably held at a predetermined distance and angle from the welding line while traveling, stable welding work is possible even if the welding position is upward. Also, by using two drive wheels with different diameters, the curved guide section corresponding to the corner of the square pipe runs faster than the straight guide section, thereby preventing a drop in the welding speed at the corner of the square pipe. Therefore, good welding quality can be obtained over the entire welding line without causing malfunctions due to electrical noise of the welding equipment.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted overall perspective view showing the state of use of the automatic welding device according to the present invention, Fig. 2 is a side view of the automatic welding device shown in Fig. 1, and Fig. 3 is a rear view of Fig. 2. , FIG. 4 is a partially omitted plan view of FIG. 2,
Figure 5 is a sectional view taken along the - line in Figure 3;
The figure is a sectional view taken along the - line in FIG. 2. 14... Square pipe, 16... Welding line, 18...
Guide, 30... Straight guide part, 32... Curved guide part, 34... Self-propelled welding part, 36... Straight rail, 38... Curved rail, 40... Traveling device, 4
2... Drive device, 44... Welding torch, 50...
Outer guide roller, 54... Inner guide roller,
58...Load receiving roller, 72...Linear drive wheel, 7
4... Curved drive wheels.

Claims (1)

[Scope of utility model registration request] a guide comprising a linear guide part corresponding to one side of the square pipe and a curved guide part corresponding to a corner of the square pipe and detachable from the square pipe; a straight rail formed in the curved guide portion, and a curved rail formed along the circumferential direction of the square pipe in the curved guide portion;
a traveling device equipped to be able to freely travel in the guiding direction of the guide; a linear drive wheel that abuts the straight rail to drive the travel; and a linear drive wheel that is larger in diameter than the linear drive wheel and that abuts the curved rail to drive the travel. a welding torch connected to an external welding device main body;
An automatic welding device characterized in that the tip of the welding torch is extended to a predetermined position near the weld line of the square pipe.