JPH054952Y2 - - Google Patents

Description

Description: FIELD OF THEINVENTION The present invention relates to a power supply device for supplying high frequency power to opposing edges of a U-shaped gap in a tubular metal plate in high frequency electric resistance welded pipe welding.

Summary of the invention A high-frequency electric resistance welding pipe welding device that moves a pipe material formed into a tubular shape having a U-shaped gap and continuously electrically welds the opposite edges thereof, and the secondary terminal part of a matching transformer. a fixed holder that is attached to and insulated with an insulating plate and provided on both sides of the insulating plate, and a pair of movable blocks that are swingably supported on support shafts formed on each of these fixed holders; A pair of contacts attached to the tip of each of these movable blocks and in sliding contact with each opposing edge of the tube material, and a pair of contacts that bias these contacts toward each edge of the tube material. In a high-frequency power supply device equipped with a pressure mechanism, each movable block is provided with a coil attachment member for attaching an induction coil for induction type ERW tube welding, and switching between contact type and induction type ERW tube welding is possible. A power supply device for high-frequency electric resistance welding pipe welding, which is characterized by easy welding.

BACKGROUND ART FIGS. 5 and 6 are conceptual diagrams of contact type and induction type electric resistance welding pipe welding devices. First, to explain Fig. 5, tube material 1 formed from a metal plate into a tube shape.
is inserted between a pair of pressure rolls 2a and 2b arranged opposite to each other, and moved in the direction of the arrow. In this case, when viewed in the direction of movement of the tube material 1, the pressure rolls 2a,
A V-shaped gap 5 is formed on the front side of 2b,
From 100kHz to the opposing edges 5a and 5b.
High frequency power is supplied by a pair of contacts 6a and 6b connected to a high frequency power source 7 with a frequency of about 400 kHz, and both edges are heated by the flow of welding current I. Furthermore, at the V-seam welding point 4 where the V-shaped gap 5 is closed by the pressure applied by the pressure rolls 2a and 2b and both edges 5a and 5b touch,
The temperature of both edges 5a, 5b reaches near the melting point, and welding is performed while being pressurized.

In addition, in the induction type electric resistance welding pipe welding apparatus shown in FIG. 6, an induction coil 3 is used in place of the contacts 6a and 6b shown in FIG. , 5b and causes the welding current I to flow therethrough.Other points are the same as the contact type.
The contact type and the induction type are used depending on their advantages and disadvantages, but in general, the contact type is suitable for welding large diameter pipes, and the induction type is suitable for welding small diameter pipes.

3A and 3B are diagrams for explaining a conventional contact type electric resistance welding pipe welding device, and FIG.
It is a BB arrow directional view in figure A. In these figures, reference numeral 1 denotes a tube material formed from a metal plate into a tube shape having a V-shaped gap, which moves in the direction of the arrow in FIG. 3A. 8a, 8b and 9a, 9b are forming rolls, and 2b is a pressure roll. 10 is a matching transformer that constitutes a part of the power supply device, 12 is an insulating plate, and 11a and 11b are two of a pair of matching transformers provided on both sides of the insulating plate 12, as shown in FIG. 3B. A conventional power supply device 31 is attached to the secondary side terminals 11a, 11b.

The power supply device 31 includes an insulating plate 14 and an insulating plate 14.
A pair of fixed holders 1 placed on both sides of the
3a, 13b, and flange portions 15a, 15b provided at the upper ends of fixed holders 13a, 13b, respectively.
, support shafts 17a and 17b provided at the bottom of fixed holders 13a and 13b, respectively, and support shafts 17
A pair of movable blocks 18a and 18b pivotably supported on a and 17b, and these movable blocks 1
A pair of contacts 19a, 19b provided at the tips of tubes 8a, 18b, pressurizing mechanisms 20a, 20b for urging the contacts 19a, 19b toward the tube material 1, and illustrations for cooling each of the above-mentioned parts. It is composed of a cooling water system (not shown).

When the tube stock 1 moves in the direction indicated by the arrow in FIG. Power is supplied through sliding contact. Power is supplied to the secondary terminal 11a of the matching transformer 10, the fixed holder 13a, the support shaft 17a, and the movable block 18.
a, the contactor 19a, the tube material 1, the contactor 19b, the movable block 18b, the support shaft 17b, the fixed holder 13b, and the secondary terminal 11b of the matching transformer. The welding of the tube material is carried out by supplying it to the edge.

By the way, for example, when the diameter of the tube material 1 that is the object to be welded becomes small, a method is often adopted in which the power supply is also used and the electric resistance welding tube is welded by switching to an induction type. In this case, the contact type power supply device 31 is removed from the secondary side terminals 11a and 11b of the matching transformer 10, and the induction coil 3 is attached instead as shown in Fig. 4, and the electric resistance welding tube is welded by the induction method. Ta. In Figure 4, 1a
is a tube material, 3 is an induction coil, 29 is an insulating plate, 27
a (not visible in the figure) and 27b are a pair of induction coil terminals provided on both sides of the insulating plate 29, and 28a (not visible in the figure) and 28b are at the upper end of each induction coil terminal, respectively. A pair of provided flange portions 30a and 30b are cooling water supply and drainage portions. The induction coil 3 has a flange portion 28a,
28b is the secondary side terminal 11a, 11 of the matching transformer
b are tightened and fixed by bolts 16a and 16b, respectively, and energized.

Problems to be Solved by the Invention When welding electric resistance welded pipes by switching between the contact type and the induction type depending on the pipe diameter of the pipe material 1 to be welded, using the power supply as described above, Conventionally, the secondary terminals 11a and 11b of the matching transformer 10
Conventionally, the contact type power supply device 31 was removed and the induction coil 3 was installed in its place, or vice versa. Removing and attaching a certain power supply device 31 not only requires a lot of work, but also requires time to replace, which increases the downtime of the device and reduces productivity.

In addition, in order to perform stable electric resistance welding, it is necessary to use forming rolls 8a, 8b and 9a, 9 as shown in FIG. 3A.
It is preferable that the distance between the pressure rolls 2a and 2b be as small as possible, and therefore the power supply device 31 is provided in a very narrow space close to these rolls. Each part of the power supply device 31 is provided with a cooling water system (not shown) and is connected to a cooling water source, and when installing or removing the power supply device 31, the connection between each of these cooling water systems and the cooling water source must be changed. It also required work. These factors also made it more difficult to replace the power supply device 31 and the induction coil 3, and the replacement took much time.

Means for Solving the Problems The present invention provides a contact-type power supply device with an induction coil mounting member on its movable block, so that the movable block can be mounted without removing the power supply device from the secondary terminal of a matching transformer. By attaching an induction coil to a coil attachment member provided in the welding section, electric resistance welding tube welding can be performed by switching to the induction method.

Example The present invention will be described below in Fig. 1, Fig. 2 A, and Fig. 2 B.
This will be explained in detail with reference to .

FIG. 1 is a diagram showing an embodiment of the power supply device of the present invention. Note that the same parts as in FIGS. 3A and 3B, which describe the conventional technique, are given the same reference numerals to simplify the explanation.

In FIG. 1, the power supply device 32 is connected to the pair of secondary terminals 1 of the matching transformer 10 as shown in FIG. 3B.
1a and 11b. Power supply device 3
A pair of movable flanges 18a, 18b, which are swingably supported by a pair of support shafts 17a, 17b at the bottom of a pair of fixed holders 13a, 13b, which are provided on both sides of the two insulating plates 14, each have a Coil attachment member 2 for attaching the oscillating coil
1a and 21b are provided. In this example,
The coil attachment members 21a, 21b have a pair of coil attachment seats 22a, 22b and tap holes 23a, 2, respectively, as shown in FIG. 1 and FIG. 2B.
3b.

2A and 2B show diagrams in which the induction coil 3 is attached to the coil attachment members 21a and 21b provided on the pair of movable blocks 18a and 18b of the power supply device 32 to form an induction type electric resistance welding tube welding device. FIG. 2B is a view taken along the line A--A in FIG. 2A.

2A and 2B, the induction coil 3 connects its pair of coil terminal portions 24a, 24b to the pair of movable blocks 18a, 18b of the power supply device 32.
Coil mounting seats 22a, 22 provided respectively in
b, respectively, and tap holes 23a, 2
Bolts 25a and 25b are screwed into 3b and tightened to fix the structure and to energize the structure. In addition, in order to fix the movable blocks 18a and 18b so that they do not swing, the movable blocks 18a and 18b are
Blocks 26a and 26b are inserted and fixed between a and 18b and pressure mechanisms 20a and 20b, respectively. That is, FIG. 2A by the pressure mechanisms 20a and 20b
Since a clockwise biasing force centered on the support shafts 17a, 17b acts on the movable blocks 18a, 18b, the movable blocks 18a, 18b are fixed simply by sandwiching the blocks 26a, 26b.

When installing the induction coil 3, the matching transformer 10 is moved slightly upward using a moving device for the matching transformer 10 (not shown), and the induction is adjusted while adjusting the positional relationship between the induction coil 3 and the tube material 1a. It is sufficient to simply attach and fix the coil 3 to the movable blocks 18a, 18b.

When the induction coil 3 is attached and powered in this way, the secondary terminal 11a of the matching transformer 10, the fixed holder 13a, the movable block 18a, the coil terminal part 24a, the induction coil 3, the coil terminal part 24
b, movable block 18b, fixed holder 13b,
Power is supplied to the induction coil 3 through the current-carrying path of the secondary terminal 11b of the matching transformer 10, and the tube material 1
A welding current is induced at the opposite edges of the V-shaped gap a to weld the tube material 1a.

In addition, each part of the power supply device 32 and the terminal parts 24a, 2 of the induction coil are shown in FIG. 1, FIG. 2A, and FIG. 2B.
4b and the like are each provided with a cooling water system for cooling these parts, but illustration thereof is omitted to avoid complication.

Furthermore, when switching between contact and induction types,
In a power supply device (not shown), circuit matching is performed by switching on and off a capacitor in a matching circuit, as in the conventional case.

Effects of the Invention As explained above, in the power supply device of the present invention, an induction coil attachment member is provided on the movable block so that the induction coil can be easily attached. When switching to the induction method for ERW pipe welding, there is no need to perform troublesome work such as removing and installing the heavy power supply device, and the switching work can be done in an extremely short time compared to conventional methods. .

Therefore, not only the work becomes easier, but also the downtime of the equipment is shortened and the operating efficiency is improved.

It is also possible to use a power supply device in which a coil attachment member for attaching the induction coil is provided on a fixed holder, but as mentioned above, the power supply device may be installed in an extremely narrow space close to the rolls, etc. Therefore, compared to the present invention in which a coil attachment member is provided on the movable block, the ease of attaching and removing the induction coil is lost, and the induction coil becomes larger and heavier. It is not effective.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a contact type power supply device according to an embodiment of the present invention. 2A and 2B are diagrams in which an induction coil is attached to the power supply device of FIG. 1 to make it an induction type. Note that FIG. 2B is a view taken along the line A-A in FIG. 2A. 3A and 3B are diagrams showing a contact type power supply device according to the prior art, and FIG. 3B is B--B in FIG. 3A.
It is a figure showing arrow B view. FIG. 4 is a diagram showing a state in which the conventional contact type power supply device is removed and an induction coil is attached in its place to create an induction type. FIG. 5 and FIG. 6 are diagrams explaining the principles of contact type and induction type high frequency electric resistance welding pipe welding, respectively. 1, 1a...Tube material, 3...Induction coil, 10
... Matching transformer, 13a, 13b ... Fixed holder, 14 ... Insulating plate, 18a, 18b ... Movable block, 19a, 19b ... Contact, 20a,
20b...Pressure mechanism, 21a, 21b...Coil attachment member, 22a, 22b...Coil attachment seat, 23a, 23b...Tap hole, 24a, 2
4b...Coil terminal portion, 26a, 26b...Block, 31, 32...Power supply device.

Claims (1)

[Scope of utility model registration request] A high-frequency electric resistance welding device for moving a pipe material formed into a tubular shape with a V-shaped gap and continuously electrically welding the opposite edges thereof, and is attached to the secondary side terminal part of a matching transformer. Also, a fixed holder insulated by an insulating plate and provided on both sides of the insulating plate, a pair of movable blocks pivotably supported on support shafts formed on each of these fixed holders, and each of these blocks. a pair of contacts attached to the tip of the movable block and in sliding contact with opposing edges of the tube stock; and a pair of pressurizers for urging the contacts toward each edge of the tube stock. A high-frequency power supply device for electric resistance welding, characterized in that a coil attachment member for attaching an induction coil for induction type electric resistance welding tube to each of the movable blocks is provided.