JPH10249548A - Electric resistance welded tube welding equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric resistance welded tube welding equipment without causing spark on a flexible conductor and without exchanging the flexible conductor. SOLUTION: A current transformer 25 is connected to a transmission duct 21 and a transmission head 22 through a bellows cylinder 23 on one side, the current transformer 25 is connected to a high frequency power source through a flexible conductor 32 and a transmission bus bar 28,a lift means 45 to lift a pair of joining parts 26 and a raising means 55 to rapidly raise them are installed, and a pair of flexible conductors 32 are connected to an insulated rod 38 installed freely sliding between insulated plates 35 inside the transmission head 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric resistance welded pipe welding apparatus, in which a spark is not generated between a pair of flexible conductors or the like.

[0002]

2. Description of the Related Art When an electric resistance welded tube is manufactured from a metal plate, after the metal plate is formed into a tube, a gap portion having a V-shaped cross section is continuously heated and welded. As means for heating welding, a contact-type ERW pipe welding device using high-frequency current,
There is a non-contact electric resistance welded pipe welding device that performs induction heating.

[0003] First, a non-contact type ERW pipe welding apparatus will be described. 8, reference numeral 1 denotes a high-frequency power source, 2 denotes a transmission bus bar, 3 denotes a flexible conductor, 4 denotes a current transformer (CT), 5 denotes a coil, 6 denotes an electric resistance welded tube, and 7 denotes an aluminum shield duct.
In order to center the ERW pipe 6 and the coil 5, the current transformer 4 can be moved ± 30 mm in the x and z directions, respectively. It is possible to move 100 mm in the direction. Here, the distances y ₁ and y ₂ between the current transformer 4 and the shield duct 7 in the y direction are 10
It is set to around 0 mm.

In such an electric resistance welded pipe welding apparatus, the gap 5 is welded by induction heating of the electric resistance welded pipe 6 by the coil 5. On the other hand, since there is a gap between the current transformer 4 and the shield duct 7, dust easily enters the shield duct 7. For this reason, the shield duct 7 needs to be periodically disassembled and inspected.

Next, a contact type electric resistance welded pipe welding apparatus will be described. FIG. 9 is a partial modification of FIG. 8, wherein 8 is a pair of contacts, 9 is contact support means, 10 is a lifting platform, and 11 is a screw shaft screwed with a nut member 12 attached to the lifting platform 10. A motor 13 for rotating the motor 13 forward and reverse via a speed reducer 14; a hydraulic cylinder 15 mounted on the lift 10 and having a rod 16 coupled to the current transformer 4;
7 is a roller.

In such an ERW pipe welding apparatus, a pair of contacts 8
The electric current flowing in the electric resistance welded tube 6 flows through the V-shaped gap portion due to the proximity effect and continuously welds this portion.
Since the pair of contacts 8 is located at the apex of the ERW pipe 6, the elevating platform 10 is moved by the motor 11 according to the outer diameter of the ERW pipe 6.
Raise and lower within the range of ₁ . Further, the contact 8 is urged to the ERW pipe 6 through the contact support means 9, and is released when the ERW pipe 6 has irregularities or when the contact 8 approaches the front and rear ends of the ERW pipe 6. The hydraulic cylinder 15 operates and the current transformer 4
At the same time, the contact 8 is pulled up in the range of z ₂ and rapidly raised. That is, the pair of contacts 8 are possible vertical movement range of z _3.

[0007]

However, when used as a contact-type ERW pipe welding apparatus, the contact 8
If the flexible conductor 3 is not prepared in two or three types having different lengths, the flexible conductor 3 and the shield duct 7 approach to each other, causing sparks and burning.
Further, by the position of the dimension y ₃ and z direction of the current transformer 4 in FIG. 9 (b), the falling to the y-direction is the length of the flexible conductor 3 is excessively large, flexible conductor each other or which the shield Duct 7
Sparks occur between them and cause damage.

For these reasons, the work of removing the shield duct 7 and exchanging the flexible conductor 3 must be frequently performed, and it takes time to check the tightening of the mounting bolts and leak the cooling water.

[0009] Therefore, an object of the present invention is to provide an electric resistance welded pipe welding apparatus which solves the above problem.

[0010]

According to a first aspect of the present invention, there is provided an electric resistance welded pipe welding apparatus in which a transmission head is coupled to a distal end of a cylindrical transmission duct, and the transmission head is provided below the transmission head. While connecting the current transformer through the bellows cylinder and attaching the heating means to the current transformer, a pair of transmission busbars, one end of which is connected to the high-frequency power supply, is arranged in the transmission duct, and the other end of each transmission busbar And the current transformer are individually connected via a flexible conductor, an insulating plate is provided on the inner surface of the transmission head via an insulating member, and a pair of insulating rods are disposed in the transmission head at a substantially right angle to the flexible conductor. The flexible conductors are connected to each other, and both ends of the insulating rod are slid on the opposing insulating plate, and elevating means for elevating and lowering the current transformer and elevating means for rapidly raising the current transformer are provided. It is characterized by.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

The construction of the electric resistance welded pipe welding apparatus according to the present invention is shown in FIGS. As shown in FIG. 2, a transfer means for moving the ERW pipe 6 in a direction perpendicular to the paper surface is provided, while an ERW pipe welding device for welding a V-shaped gap of the ERW pipe 6 is provided. .

A transmission duct 21 is provided on a movable base 20 which can move in a direction perpendicular to each other on a horizontal plane. A transmission head 22 is attached to a tip of the transmission duct 21. The transmission head 22 is formed of aluminum as a non-magnetic material that shields high-frequency leakage magnetic flux. A housing 24 is attached below the transmission head 22 via a bellows cylinder 23. The current transformer 25 is housed in the housing 24. A pair of contacts 26 for supplying electricity to the electric resistance welded tube 6 and a support 27 for supporting the contacts 26 are attached to the current transformer 25 as heating means.

The transmission duct 21 houses a pair of transmission busbars 28, one ends of which are connected to a high-frequency power supply (not shown). A fixed bus flange 30 is attached to the current transformer 25 via a power supply flange 29, and a fixed bus flange 31 is also attached to the other end of the pair of transmission bus bars 28, and a flexible conductor is provided between the fixed bus flanges 30, 31. 3
2 are connected. As a result, the high-frequency current and the cooling water flow through the transmission bus bar 28.

Next, the internal structure of the transmission head 22 will be described. As shown in FIG. 3, main openings are formed on the left and right sides of the transmission head 22, and lids 33 for closing the main openings are attached via bolts 34. Further, as shown in FIG. 7, an auxiliary opening is formed on one side of the transmission head 22, and a lid 37 for closing the auxiliary opening is attached via a bolt. Then, the front and inside of the upper surface of the transmission head 22 and the lid 3
An insulating plate 35 is attached to the inner side of 3 through an insulator 36 for the purpose of preventing high-frequency leakage magnetic flux and contact spark.

In order to properly maintain the distance between the pair of flexible conductors 32 and the distance between the flexible conductor 32 and the insulating plate 35,
The insulating rod 38 of FIG. 6 is provided. Four holes 39 are formed in the insulating rod 38, and a pair of flexible conductors 32 are connected via an insulating band 40 inserted into the holes 39 as shown in FIG. In this manner, two insulating rods 38 are attached to the pair of flexible conductors 32.

As shown in FIGS. 3 and 4, the vicinity of the end on the power supply side of the flexible conductor 32 is supported via an insulating support member 41. On the other hand, a conductor 42 connecting the current-supply side and the non-power-supply side of the flexible conductor 32 is supported by an insulating flange 44 attached to an upper portion of the housing 24 via an insulating member 43 as shown in FIG. .

Next, the elevating means 45 for elevating the current transformer 25 together with the contact 26 will be described. As shown in FIG. 2, a vertically long rail 47 is formed on the frame body 46, and an elevating table 48 is provided along the rail 47 so as to be vertically movable. Further, a slide table 61 is provided on the lift table 48 so as to be slidable in the vertical direction via a rail 60. The slide table 61 is coupled to the housing 24 via an insulating plate 49, while a nut member 51 is coupled to an arm 50 fixed to the elevating table 48, and a screw shaft 52 is screwed to the nut member 51. . The screw shaft 52 is connected to the motor 5 via a speed reducer 53.
4 are linked to each other. Here, the slide table 61 and the insulating plate 49 are connected via an L-shaped steel 62. The L-shaped steel 62 and the slide table 61 are bolted together through a long hole 62b extending in a direction perpendicular to the plane of the drawing, while the L-shaped steel 62 and the insulating plate 49 are bolted together via a long hole 62a extending in the left-right direction. Be combined.

In addition, a raising means 55 is provided for rapidly raising the contact 26 and the like. A hydraulic cylinder 56 is connected to the frame 46, and the rod 57 is connected to a slide base 61.
Facing the underside of. The hydraulic cylinder 56 is connected to a hydraulic pump 59.

In FIG. 1, reference numeral 59 denotes a pair of drum-shaped rollers sandwiching the ERW tube 6 from both sides, and reference numeral 60 denotes a normal cylindrical roller.

Next, the operation of the ERW pipe welding apparatus will be described. The motor 54 is rotated to raise and lower the contact 26 in accordance with the outer diameter of the ERW pipe 6. The rotational movement of the motor 54 is transmitted to the screw shaft 52 via the speed reducer 53,
The housing 24 moves up and down together with the nut member 51 screwed to the screw shaft 52. At this time, since the bellows cylinder 23 expands and contracts,
4 is not restricted. Further, since the flexible conductor 32 is freely bendable in the transmission head 22, the vertical movement of the current transformer 25 is not restricted. 3, the distance between the flexible conductors 32 and the left and right insulating plates 35 is always kept constant by the insulating rods 38 as shown in FIG. Does not approach the inner surface of the transmission head 22 due to the presence of the upper and front insulating plates 35.

Next, referring to FIG.
Distance If y ₃ a determines provided welding conditions decision stroke, L-section steel 62 along the length of the elongated hole 62b in After loosening the bolts joining the L-shaped steel 62 and the slide base 61 with Move and tighten the bolts. On the other hand, when the housing 24 is moved in the x direction, the bolt connecting the L-shaped steel 62 and the insulating plate 49 is loosened, and then the insulating plate 49 is moved along the length direction of the long hole 62a to remove the bolt. Tighten. In any case, the bellows cylinder 23 absorbs the relative displacement between the transmission head 22 and the housing 24.

To weld the electric resistance welded tube 6, the rollers 59,
While feeding the ERW pipe 6 in the lengthwise direction by 60, electricity is supplied to the ERW pipe 6 from the pair of contacts 26. If there is a protrusion or the like in the electric resistance welded tube 6 during welding, a sensor (not shown) detects this and operates the hydraulic pump 59 so that the rod 57 of the hydraulic cylinder 56 rapidly pushes up the contact 26 together with the slide base 61. .

In FIG. 7, the flexible conductor 32 and the insulating rod 3
8. When checking the fixed bus flanges 30 and 31, the lid 37 is opened. The installation and replacement of the flexible conductor 32
This is performed by opening the left and right lids 33 shown in FIG. At this time, cover 3
3 and the left and right insulating plates 35 are also integrated.
The pair of flexible conductors 32 connected by 8 can be integrally removed.

It should be noted that a coil for induction heating may be provided as a heating means instead of the contact.

[0026]

As can be seen from the above description, claim 1
According to the ERW pipe welding apparatus according to the above, the transmission bus bar for connecting the high frequency power supply and the current transformer and the flexible conductor are sealed by the transmission duct, the transmission head, and the bellows cylinder, so that the flexible conductor and the like come into contact with the outside air. The problem caused by the adhesion of dust is eliminated. In addition, since a pair of flexible conductors are connected via an insulating rod and are arranged between insulating plates provided on the inner surface of the transmission head, the interval between the flexible conductors and the interval between the flexible conductor and the transmission head are determined. Is maintained at a constant value to prevent spark damage. Further, there is no need to prepare a plurality of flexible conductors having different lengths as in the related art.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of an electric resistance welded pipe welding apparatus according to the present invention.

FIG. 2 is a right side view showing the embodiment of the electric resistance welded pipe welding apparatus according to the present invention.

FIG. 3 relates to an embodiment of an electric resistance welded pipe welding apparatus according to the present invention,
FIG. 2 is a view taken in the direction of arrows AA in FIG. 1.

FIG. 4 relates to an embodiment of an electric resistance welded pipe welding apparatus according to the present invention,
FIG. 4 is a view taken in the direction of arrows CC in FIG. 3.

FIG. 5 relates to an embodiment of an electric resistance welded pipe welding apparatus according to the present invention,
The top view of a housing.

FIG. 6 relates to an embodiment of an electric resistance welded pipe welding apparatus according to the present invention,
The perspective view of an insulating rod.

FIG. 7 relates to an embodiment of the electric resistance welded pipe welding apparatus according to the present invention,
The BB arrow line view of FIG.

FIG. 8 relates to a conventional non-contact type ERW pipe welding apparatus;
(A) is a front view, (b) is a right side view.

FIG. 9 relates to a conventional contact-type ERW pipe welding apparatus,
Is a front view, and (b) is a right side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 ... Transmission duct 22 ... Transmission head 23 ... Bellows cylinder 25 ... Current transformer 26 ... Contact 28 ... Transmission bus bar 32 ... Flexible conductor 35 ... Insulating plate 36 ... Insulator 38 ... Insulating rod 45 ... Elevating means 55 ... Elevating means

Claims (1)

[Claims] 1. A transmission head is coupled to a tip of a cylindrical transmission duct, a current transformer is coupled below the transmission head via a bellows tube, and a heating means is attached to the current transformer. A pair of transmission busbars connected to the transmission bus are disposed in the transmission duct, the other end of each transmission busbar and the current transformer are individually connected via a flexible conductor, and an inner surface of the transmission head is connected via an insulating member. An insulating plate is provided, and a pair of flexible conductors are coupled to an insulating rod disposed substantially at right angles to the flexible conductor in the transmission head, and both ends of the insulating rod are set to slide on the opposing insulating plate, An electric resistance welded pipe welding device, comprising: elevating means for elevating and lowering a current transformer; and elevating means for rapidly elevating the current transformer.