JPH0335495Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a grounding device for a flange welding device that welds a flange to an end of a pipe while the pipe is rotated.

(Prior Art and its Problems) Conventionally, many pipes in piping systems for various mechanical devices are connected by flanges, and therefore, in pipe processing departments, it is necessary to weld flanges to both ends of the pipes.

Recently, welding equipment is used to weld the flange to the end of the pipe, which automatically welds the pipe by placing it on a rotating roller and rotating it.
In this case, the circumferential surface of the pipe is often covered with an oxide film or paint film, and the pipe is rotating, so difficulties arise in terms of a grounding mechanism for grounding the large current during welding.

For example, a conductor (electric brush) on the circumference of a pipe
If the pipe and the conductor are grounded in elastic contact, sparks will occur between the pipe and the conductor, which will cause them to weld together, making the rotation of the pipe unstable and deteriorating the quality of the weld between the pipe and the flange. Damage to the circumferential surface of the pipe occurs due to sparks.

Therefore, for example, it is possible to ground the fixed side of a rotating sliding contact type energizing mechanism and also clamp the wall of the end of the pipe with a clamp connected to the rotating side via a cable. This type of grounding device has the disadvantage that it has poor durability and is not suitable for automation.

Therefore, it may be possible to polish the circumferential surface of the pipe by bringing a rotatably driven polishing roller into contact with the circumferential surface of the pipe, but since the polishing roller wears out and gradually becomes smaller in diameter, the diameter of the pipe also varies. Because of the fluctuation, it is difficult to reliably polish the circumferential surface of the pipe.
A problem arises in that when the pipe moves due to the abrasive force, welding quality is adversely affected.

(Means for solving the problem) The grounding device for flange welding equipment according to the present invention has the following features:
A welding device for welding a flange to the end of a pipe while a pipe is placed on a rotating roller and rotated, the welding device comprising: a polishing roller disposed parallel to the pipe and in contact with the lower side of the circumferential surface of the pipe; a roller support mechanism that supports a polishing roller so that it can be raised and lowered via a parallel link and elastically biases the polishing roller toward the pipe; a transmission motor that rotationally drives the polishing roller via a flexible rotational transmission shaft; and a conductor that is brought into contact with the upper end portion of the circumferential surface of the pipe polished by the polishing roller and elastically biased toward the pipe by a spring member.

(Function) In the grounding device for flange welding equipment of the present invention, as described above, a polishing roller oriented parallel to the pipe is brought into contact with the peripheral surface of the pipe rotating on the rotating roller, and is elastically biased to polish the pipe. Since the roller is rotationally driven by an electric motor, the oxide film and paint film on the circumference of the pipe are scraped off by the polishing roller, and since the conductor is in contact with this polished pipe circumference, the pipe and This means that the pipe can be reliably grounded by making sliding contact with the conductor so that electricity can be passed through it.

The polishing roller is brought into contact with the lower side of the circumferential surface of the pipe, and a roller support mechanism is provided that supports the polishing roller so that it can be raised and lowered via a parallel link, and elastically biases the polishing roller toward the pipe. Even if the diameter of the rollers becomes smaller due to wear, the peripheral surfaces of pipes of various diameters can be reliably polished.

Since the conductor is brought into contact with the upper end portion of the circumferential surface of the pipe and is elastically biased toward the pipe by a spring member, pipes of various diameters can be reliably grounded.

The polishing roller is brought into contact with the lower side of the circumferential surface of the pipe and is elastically biased toward the pipe, and the conductor is brought into contact with the upper end of the pipe and is resiliently biased toward the pipe. The force can prevent the pipe from moving upward.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a schematic plan view of an automatic flange assembly and welding device for automatically welding flanges to the ends of pipes, and the outline of this device is as follows.

Pipes P of various diameters and lengths are supplied onto the downward slope pedestal 1 from the front to the rear, and are scooped up by the swinging arm 2a of the pipe handling device 2 and placed on the rollers 3a and 3b of the rotary drive device 3. supplied to

The automatic flange supply device 4 includes a plurality of types of flange supply units 4a, and the flange supply unit 4a of the flange F according to the diameter of the pipe P.
is connected to the drive device 4b, the automatic flange supply device 4 moves to the imaginary line position, positions the right end of the pipe P, and attaches the flange F to the end of the pipe P.

When the flange F is attached to the end of the pipe P, the welding robot 5 temporarily welds the flange F to the pipe P, and after the automatic flange supply device 4 moves to the solid line position on the right, it rotates the pipe P. The flange F is automatically welded to the pipe P by the welding robot 5 while rotating on the rollers 3a and 3b of the device 3, and after welding is completed, the rollers 3a and 3b of the rotary drive device 3 are swung by the air cylinder 3c. By tilting backward, the flanged pipe P is transferred to the unloading table 6.

The rotational drive device 3 includes two pairs of four rubber rollers 3a and three pairs of metal idler rollers 3b, which are rotationally driven by a motor.
The rotation of the pipe P causes the pipe P to rotate at a predetermined speed.

When welding the flange F to the pipe P, in order to ground the pipe P, the shaft 3d is connected between the rubber rollers 3a of the rotary drive device 3.
The grounding device 7 disposed on the front side of the vehicle will be explained in detail with reference to FIGS. 2 and 3.

The earthing device 7 includes a polishing roller 8 , a roller support mechanism 9 that supports the polishing roller 8 , an electric motor 11 that rotationally drives the polishing roller 8 via a flexible rotational transmission 10 , and a grounding roller 12 . Equipped with a grounding mechanism, etc.

The polishing roller 8 is a grinder roller for scraping off the oxide film coating on the circumferential surface of the pipe P, and is arranged so as to come into contact with the circumferential surface of the pipe P of various diameters placed on the rubber roller 3a. It is arranged parallel to the pipe P near the lower front side of the pipe P, and its support shaft 13 is supported by a bearing in a bearing block 9a of the support mechanism 9.

The bearing block 9a is supported by a fixed member 9c on the frame 14 via a parallel link consisting of two front and rear link plates 9b, and the bearing block 9a is supported by a compression spring 9d interposed between the bearing block 9a and the frame 14.
is elastically biased upward.

However, instead of the compression spring 9d, a tension spring may be used to bias the bearing block 9a to the right in FIG. 2, thereby biasing the bearing block 9a upward. By biasing the lever with a spring, the bearing block 9a
may be biased upward.

A rotary transmission shaft 10 connected to the end of the support shaft 13 within the bearing block 9a is connected to the output shaft of an electric motor 11, so that the electric motor 11 can rotate the polishing roller 8 at high speed. .

The above earthing mechanism is as follows.

That is, a pipe P is attached to the tip of a horizontal arm portion 16a of an inverted L-shaped metal arm 16 that is fixed at its base end to a swing shaft 15 disposed parallel to the shaft 3d on the front side of the shaft 3d and extends upward. A metal cylindrical body 17 is provided vertically located directly above the cylindrical body 17, and a metal cylindrical body 17 is supported at the bottom of this cylindrical body 17 so as to be vertically slidable and protrudes outside the lower end of the cylindrical body 17. A copper earth roller 19 is rotatably mounted on the lower end of the roller support 18, and the roller support 18 is elastically biased downward by a spring 20 mounted within the cylindrical body 17.

The earth roller 19 is connected to the polished peripheral surface 21 of the pipe P polished by the polishing roller 8 by the spring 20.
When welding the flange F, the welding current flows from the pipe P to the earth roller 19, and from the earth roller 19 to the roller support 1 that slides on the end surface of the earth roller 19.
8 and from the roller support 18 via a flexible copper cable 22 to the welding machine.

However, it goes without saying that the welding current may flow in the opposite direction to the above depending on the polarity of welding.

In order not to prevent the pipe P from being fed onto the rollers 3a and 3b of the rotary drive device 3 by the pipe handling device 2, the swing shaft 15 is rotated by about 90 degrees with an air cylinder via a lever. The arm 16 is designed to be able to swing downward as shown by the imaginary line in FIG.

However, instead of the earth roller 19, a brush made of metal or carbon and made of sliding contact, such as a brush of a motor, may be provided.

Since the earth roller 19 is biased by a spring 20, it restrains the pipe P from being pushed upward by the polishing roller 8.
It is also conceivable to provide a pair of press rollers or the like for pressing the upper side of the pipe P at 6. Further, the ground roller 19 may not be provided on the swingable arm 16, but may be provided on a member vertically installed from the ceiling side.

In the grounding device 7, when welding the flange F to the end of the pipe P while rotating the pipe P placed on the rollers 3a and 3b of the rotary drive device 3 with the rubber roller 3a, the rotation occurs on the circumferential surface of the pipe P. The driven polishing roller 8 comes into elastic contact to remove the oxide film and paint film on the circumferential surface of the pipe P, and polishes the polished circumferential surface 2.
The welding current flows through the ground roller 19 that comes into elastic contact with the ground roller 19.

(Effects of the invention) As explained above, in the grounding device for flange welding equipment of the present invention, a polishing roller that is rotationally driven is brought into contact with the circumferential surface of the pipe rotating on the rotating roller, and the circumferential surface of the pipe is ground. Since the oxide film and paint film are removed and the conductor is brought into contact with the polished circumferential surface of the pipe, the pipe and the conductor come into sliding contact so as to conduct electricity.

The polishing roller is brought into contact with the lower side of the circumferential surface of the pipe, and a roller support mechanism is provided that supports the polishing roller so that it can be raised and lowered via a parallel link, and elastically biases the polishing roller toward the pipe. Even if the diameter of the rollers becomes smaller due to wear, the peripheral surfaces of pipes of various diameters can be reliably polished.

Since the conductor is brought into contact with the upper end portion of the circumferential surface of the pipe and is elastically biased toward the pipe by a spring member, pipes of various diameters can be reliably grounded.

Since the polishing roller is brought into contact with the lower side of the circumferential surface of the pipe and is elastically biased toward the pipe, and the conductor is brought into contact with the upper end portion of the pipe and is biased elastically toward the pipe, The polishing force can prevent the pipe from moving upward.

In this way, even with a grounding device with a simple structure,
It is possible to reliably ground pipes of various diameters, improve the quality of flange welding, and prevent pipe damage.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic plan view of an automatic flange assembly and welding device, and FIG.
The figure is a front view of the grounding device, and FIG. 3 is a side view of the grounding device. P... Pipe, F... Flange, 3a... Rubber roller, 8... Polishing roller, 9... Roller support mechanism, 10... Flexible rotation transmission shaft, 11... Electric motor, 13... Support shaft, 16...arm, 19...
Earth roller, 20... spring, 22... flexible cable.

Claims (1)

[Claim for Utility Model Registration] In a welding device that welds a flange to the end of a pipe while rotating the pipe by placing it on a rotating roller, the welding device is installed parallel to the pipe and is placed in contact with the circumferential surface of the pipe on the lower side. a polishing roller that is in contact with the polishing roller; a roller support mechanism that supports the polishing roller so as to be able to rise and fall via a parallel link and elastically biases the polishing roller toward the pipe; and a flexible rotation transmission shaft that connects the polishing roller. The present invention is characterized by comprising: an electric motor that is rotationally driven through the polishing roller; and a conductor that is in contact with the upper end portion of the circumferential surface of the pipe polished by the polishing roller and is elastically biased toward the pipe by a spring member. Grounding device for flange welding equipment.