JPH087984Y2 - Power supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a power supply device for supplying electric power from a power supply device in an electric resistance welded pipe device to a movably installed welding device.

B. Outline of the Invention The present invention is a power supply device for supplying power from a power supply device of an electric resistance welded pipe device to a movably installed welding device. In this power supply device, a flexible cable is connected to a movable terminal portion of an energizing rotary joint. With this configuration, the flexible cable is prevented from being forcibly bent even if the welding device moves largely.

C. Conventional Technique As a conventional electric resistance welded pipe apparatus, there is one such as a high frequency electric resistance welded pipe welding apparatus for manufacturing the spiral welded pipe illustrated in FIGS. 5 and 6.

This high frequency electric resistance welded pipe welding device is mainly used for the high frequency power source unit 1.
And a welding device 2 and a power feeding unit 3.

The high frequency power supply unit 1 is fixedly installed at a predetermined position.

The welding device 2 includes a matching transformer 4, a pair of secondary conductors 5 connected to the secondary winding of the matching transformer 4, a head portion 6, and a pair of contacts 7 provided at the tip of the head portion 6.
Consists of

Further, the welding device 2 is installed on the moving device 8 in order to adjust the positional relationship with respect to the object to be welded or to move when performing maintenance and inspection.

The power supply unit 3 includes a high-frequency power supply unit 1 and a movable welding device 2
And a flexible connecting conductor or the like for electrically connecting the and.

That is, the power feeding unit 3 is the matching transformer 4 of the welding device 2.
The pair of power receiving ends connected to the primary winding of the high frequency power supply unit 1 and the pair of output ends of the high frequency power supply unit 1 are connected to each other.

The power feeding unit 3 is required to be able to pass a high voltage, high frequency, and high density current and to be bendable following the movement of the welding device 2. It is desirable that the power feeding section 3 is cooled so as to prevent it from being heated to a high temperature due to a skin effect and a proximity effect due to a high frequency current.

Conventionally, a flexible cable 9 as shown in FIGS. 5 and 7 or a copper strip 10 as shown in FIG. 6 is used for the power feeding section 3.

As shown in FIG. 7, this flexible cable 9 has a conductor 12 braided in a cylindrical mesh shape inserted into a soft and flexible hose 11 made of synthetic resin. Is covered with a spacer 13 knitted in a mesh shape,
Further, a heat-resistant and insulating holder 14 shaped like a spiral spring is inserted through the conductor. When the flexible cable 9 is used, cooling water is passed through the hose.

The copper strip 10 uses a plurality of thin copper strips stacked together.

The spiral welded pipe is manufactured by the above-described high frequency electric resistance welded pipe welding apparatus as follows.

First, in the high-frequency electric resistance welded pipe welding device, the welding device 2 is moved and adjusted so that the contacts 7 are brought into contact sliding contact with a pair of edges of the pipe material, which is the object to be welded, to be welded. . At the same time, the contact 7 is supplied with the high-frequency power sent from the high-frequency power supply 1 to the welding device 2 via the power supply 3 to perform welding.

D. Problem to be Solved by the Invention In the conventional high frequency electric resistance welded pipe welding apparatus configured as described above, the welding device 2 is moved by the moving device 8 in the direction of arrow V in the figure, and the height position Lv of the contact 7 is changed. Needs to be adjusted to fit the welded pipe 15 that is the object to be welded. At the same time, in this high frequency electric resistance welded pipe welding apparatus, the welding device 2 is arranged so as not to interfere with the replacement work for changing the pipe size of the welded pipe 15 to a large size or a small size as shown by the dashed line in the figure.
Needs to be largely moved and retracted in the H direction to the position indicated by the chain double-dashed line. Therefore, the back stroke of the moving device 8 must be large.

In the high frequency electric resistance welded pipe welding device as described above, the welding device 2
The movement in the V direction for adjusting the height position Lv in (1) does not cause any trouble because the movement distance is generally short, but there is a problem when the welding device 2 is largely moved and retracted in the H direction.

For example, as shown in FIG. 6, in the case where the copper strip 10 is used as the power feeding part, since the flexibility of the copper strip 10 is not large,
Welding device 2 after removing the copper strip 10 at the receiving end each time
Was largely moved back and forth in the H direction.

Therefore, there is a problem that a lot of time and labor are required for the replacement work for changing the pipe size. In addition, since the copper strip 10 is a current-carrying part, there is a problem in that it is not preferable for the worker to touch it for safety reasons.

Further, in the case where the flexible cable 9 is used as the power feeding portion as shown in FIG. 5, the welding device 2 can be largely moved and retracted in the H direction without removing the flexible cable 9. However, in this case, as shown by the chain double-dashed line in the figure, the flexible cable 9 is forcibly bent, and the flexible cable 9 is forcibly bent with a small radius of curvature R ₁ , R ₂ , R ₃ .

Therefore, there is a problem that the durability of the flexible cable 9 is significantly reduced, and the durability is shortened to about one third to one fifth of that when the flexible cable 9 is used without being forcibly bent. It was In order to avoid this, if the movement range of the welding device 2 is limited so as to be small, there is a problem that the work of changing the size of the workpiece becomes difficult.

In view of the above points, the present invention provides a power supply device that prevents excessive bending of the power supply unit that connects the welding device and the high frequency power supply unit, even if the welding device is largely moved. To aim.

E. Means for Solving the Problems In the electric resistance welded pipe device, a power supply unit that is connected to supply power from the power supply device to the movably installed welding device,
A flexible cable is electrically connected to the movable terminal portion of the energization rotary joint, and is also configured to be water-permeable.

F. Action With the above-described configuration, even when the electric resistance welding pipe device is largely moved, the flexible cable of the welding device rotates so as to swing its neck from the portion of the energizing rotary joint, and this flexible cable is It can be bent in a large bow shape without being bent small,
This is to prevent the flexible cable from being overloaded.

G. Example Hereinafter, the first example of the welding device of the electric resistance welded pipe device of the present invention will be described.
This will be described with reference to FIGS. In FIGS. 1 to 4, parts corresponding to those in FIGS. 5 to 7 described above are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a schematic configuration diagram showing a high-frequency electric resistance welded pipe welding apparatus. In FIG. 1, 1 is a high-frequency power source part, 2 is a welding device, 3 is a power feeding part, and 15 is a welded pipe which is an object to be welded.

The power feeding unit 3 is composed of an electric rotary joint 16 and a flexible cable 9.

In addition, the power feeding unit 3 is configured by connecting an output rotary joint 16 to an output end 17 of the high frequency power source unit 1 and connecting a tip end of a flexible cable 9 to a power receiving end 18 of a matching transformer 4 of the welding device 2.

The energizing rotary joint 16 is constructed as shown in FIGS. 2 and 3.

This energizing rotary joint 16 has its fixed terminal
19 is fastened and connected to the output end 17 of the high frequency power supply unit 1 with a bolt 20.

A support shaft 21 is erected on the fixed terminal portion 19. The thick shaft portion 21a at the root portion of the support shaft 21 has a shaft hole 22a of the movable terminal portion 22.
Is fitted so that the movable terminal portion 22 is rotatably supported.

Further, an annular protrusion is provided around the shaft hole 22a of the movable terminal portion 22, and an end surface 22b of the annular protrusion is located outside the end surface of the thick shaft portion 21a.

Further, a washer 23 is fitted on the thin shaft portion 21b of the support shaft 21.
Then, the end surface of this washer 23 is brought into contact with the end surface 22b of the movable terminal portion 23.

A leaf spring 24 is passed through a screw portion 21c formed at the free end of the support shaft 21, and the leaf spring 24 is placed on a washer 23. Further screw part 21c
The adjusting nut 25 is fitted to the plate so that the leaf spring 24 is appropriately pressed.

The energization rotary joint 16 is provided with a water passage hole 27 that communicates with the end of the screw portion 21c through the inside of the support shaft 21 from the cooling water port 26 provided in the fixed terminal portion 19. Then, the water passage hole 27 is fitted with the cooling water port 28 fitted to the screw portion 21c.
To connect. One end of a hose 29 is connected to this cooling water port 28. The other end of this hose 29 is connected to a cooling water port 30 separately provided in the movable terminal portion 22. The movable terminal portion 22 is provided with a cable connection pipe 31, and a water passage hole 32 that communicates from the cooling water port 30 to the end port of the cable connection pipe 31.

In addition, the connecting member 33 provided at the free end of the cable connecting pipe 31.
Is connected to one end of the flexible cable 9.

As shown in FIG. 1, when the welding device 2 is largely moved in the direction of arrow H, the power feeding portion 3 configured as described above operates so as to shake the head at the portion of the energizing rotary joint 16.

That is, the movable terminal portion 22 rotates around the thick shaft portion 21a of the energizing rotary joint 16. The rotation resistance of the movable terminal portion 22 is performed by the screwing adjustment operation of the adjustment nut 25. That is, when the adjusting nut 25 presses the leaf spring 24, the washer 23 is pressed against the end surface by the pressure of the leaf spring 24.
Adjust the force that presses against 22b. By adjusting in this way, the resistance force to the rotation of the movable terminal portion 22 can be adjusted appropriately. Along with this, the movable terminal portion 22 is pressed against the pedestal 19a of the fixed terminal portion 19 so that the energization during this period is performed without any trouble.

In addition, the power receiving end 18 of the matching transformer 4 is bent in an appropriate direction so that the flexible cable 9 connected to the power receiving end 18 bends in a bow shape as the welding device 2 moves, thereby causing a radius of curvature R. ₄ is set to have a radius as large as possible, and the bending direction of the flexible cable 9 as a whole is set to one place.

The power supply unit 3 of the present example configured as described above has the output terminal 17
And the power receiving end 18 can be electrically connected to each other so as to electrically supply high frequency power. Further, by supplying the cooling water to the cooling water port 26 on the inlet side of the fixed terminal portion 19, the cooling water port is passed from the water channel hole 27 through the cooling water port 28 and the hose 29.
Water can enter into the flexible cable 9 through the water passage 32. Therefore, the energizing rotary joint 16 can be cooled well and the flexible cable 9 can be cooled well.

Further, as indicated by a chain double-dashed line in FIG. 1, the welding device 2 can be largely moved in the H direction without the flexible cable 9 being excessively bent.

The configuration other than that described above is the same as that of the conventional example shown in FIG. 5 described above, and therefore its description is omitted.

Next, another embodiment of the present invention will be described with reference to FIG.

The power supply unit 3 shown in FIG. 4 is provided with an output end 17 of the high frequency power supply unit 1, a power reception end of the welding device 2, and an energization rotary joint 34 at three positions in the middle thereof, and each energization rotary joint is arranged. Each of the 34 is connected by a primary conductor such as a bus bar 35.

Also in the case of this example, as shown by the chain double-dashed line in FIG. 4, the operation of moving the welding device largely backward in the direction of the arrow H can be executed without any hindrance while the power supply unit 3 is still connected. is there.

However, in the configuration of the apparatus of this example as described above, a total of six energizing rotary joints 34 are required as the pair of power feeding sections 3 for connecting the high frequency power source section 1 and the welding apparatus 2, which is an economical burden. May occur, or the number of adjustment points of the energizing rotary joint 34 may increase.

H. Effect of the Invention As described in detail above, according to the power supply device for the electric resistance welding device of the present invention, the power supply device connected to the power supply device so as to supply power to the movably installed welding device is connected to the energization rotary. Since the flexible cable is electrically connected to the rotatable movable terminal part of the joint and connected so as to allow the cooling water to pass therethrough, even when the induction heating device is largely moved, the flexible cable is This flexible cable can be bent at one large bow-shaped bend by swinging from the part of the energizing rotary joint so that the flexible cable can be bent at one large bend, and the hose joint and conductor of this flexible cable can be bent slightly. Since it does not exist, the number of breakage accidents can be reduced and its service life is 3 to 5
It has the effect that it can be doubled.

In addition, even in the case of replacement work such as changing the pipe diameter of the pipe to be welded due to the change of the object to be welded, the welding device can be moved largely without removing the power feeding device, so the work efficiency is improved. There is an effect that it can be improved. Furthermore, since there is no need to touch the high-voltage power supply unit, there is an effect that the work can be performed safely.

Further, this power supply device can supply cooling water together with supply of high-frequency power from the power supply device side to the welding device side.

Therefore, since the entire power supply device is water-cooled, there is an effect that it can be used for a large-capacity device that supplies a large amount of power.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a power feeding device of the present invention,
FIG. 2 is an enlarged front view illustrating a part of the energizing rotary joint, FIG. 3 is a partial sectional side view of a main part thereof, and FIG.
FIG. 5 is a schematic configuration diagram illustrating another embodiment of the present invention, FIG. 5 is a schematic configuration diagram illustrating a conventional high-frequency heating device, FIG. 6 is a schematic configuration diagram illustrating another conventional example, and FIG. It is a principal part expanded partial sectional view which illustrates the flexible cable. 1 ... High frequency power supply part, 2 ... Welding device, 3 ... Power supply part,
16 …… energizing rotary joint, 19 …… fixed terminal part,
22 …… Movable terminal part, 23 …… Washer, 24 …… Leaf spring, 25 ……
Adjustment nut.

Claims (1)

[Scope of utility model registration request] 1. A power supply device for supplying electric power from a power supply device of an electric resistance welded pipe device to a movably installed welding device, wherein the movable terminal part is fitted to a support shaft projecting from a fixed terminal part. Is supported by a nut screwed onto the threaded portion at the tip of the support shaft so as to be swingable while being pressed to the fixed terminal side through a leaf spring, and a cooling water passage is provided inside the fixed and movable terminal sections. An energizing rotary joint is configured, and fixed terminal portions of the pair of energizing rotary joints are connected to and fixed to a pair of output ends of a power supply device, respectively, and one end of a pair of water-cooled flexible cables is attached to the tip of the movable terminal portion. A power supply device, which is connected to each other to connect the other ends of the pair of water-cooled flexible cables to a pair of power receiving ends of a welding device to supply electric power and pass cooling water.