JPH0230433Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to an ERW tube heating device for heating a seam welded portion of an ERW tube by induction heating to perform heat treatment such as annealing.

B. Summary of the invention The present invention involves attaching a matching transformer to an inductor that faces the seam welded part of the ERW pipe during transport, and movably moving the matching transformer along an arcuate guide rail that is coaxial with the ERW pipe. In the sewing pipe heating device, a rotating body is movably attached to a guide rail that can be raised and lowered, a matching transformer is provided on the rotating body so that it can be raised and lowered, and an arc-shaped rack having the same center as the guide rail is fixed to the rotating body, By easily engaging the pinion connected to the drive means, the matching transformer moves along the guide rail,
Even if the seam weld is twisted (moves in the circumferential direction of the ERW pipe), the inductor moves on a circle concentric with the ERW pipe and always faces the seam weld, ensuring that the seam weld is accurately aligned. It is designed to be heated.

C. Prior Art In order to improve the structure of the seam weld in an electric resistance welded tube seam welded by high frequency heating, the seam weld is generally subjected to heat treatment such as partial annealing. Such partial annealing of the seam welded portion of an electric resistance welded tube has generally been carried out using an electric resistance welded tube heating device having a configuration as shown in FIG.

FIG. 2 is a diagram showing an example of an electric resistance welded tube heating device equipped with a power cylinder-driven turning means. In the figure, reference numeral 1 denotes an electric resistance welded tube, which is supported by a support base 2. On the other hand, 3 is a device stand, and two support stands 5 are mounted on this device stand 3 via an elevating means 4.
a and 5b are installed to constitute a device main body 10. The elevating means 4 includes a motor 4a and a feed screw 4b connected to the motor 4a via a bevel gear or the like. Furthermore, a guide rail 6 having an arc shape whose center coincides with the center of the electric resistance welded tube 1 is disposed on the support stands 5a and 5b, and a rotating body 7 is mounted on the outer peripheral surface of the guide rail 6. It is attached so that it can move freely along the surface. This revolving body 7 receives power from a power cylinder 8a attached to the extension 6a of the guide rail 6 via a rod 8b, and moves on the outer peripheral surface of the guide rail 6. The above-mentioned guide rail 6, revolving body 7,
The power cylinder 8a constitutes the turning means 13.

An inductor 9 facing the outer peripheral surface of the electric resistance welded tube 1 and a matching transformer 14 for supplying high frequency energy to the inductor 9 are attached to the rotating body 7. Further, between the rotating body 7 and the matching transformer 14,
A lifting jack 1 that is driven by a lifting motor 12a and lifts and lowers the inductor 9 together with the matching transformer 14.
2b is present. The lifting motor 12a and the lifting jack 12b constitute the lifting means 12.

According to the conventional ERW tube heating device configured as described above, the position of the inductor 9 is adjusted by the turning means 13 against twisting in the circumferential direction of the seam welded portion of the ERW tube 1. 9 heats the seam welded portion of the electric resistance welded tube 1. Furthermore, ERW pipe 1
With respect to changes in the outer diameter, the axis alignment of the guide rail 6 and the position adjustment of the inductor 9 are performed by the lifting means 4 and 12.

D. Problems to be Solved by the Invention However, the conventional electric resistance welded pipe heating device having such a configuration has the following problems.

That is, the electric resistance welded tube heating device shown in FIG. 2 converts the linear motion of the rod 8b of the power cylinder 8a directly into a rotating motion to move the rotating structure 7. Therefore, the turning angle of the rotating body 7 cannot be made very large, and the rotating body 7 cannot be moved at a constant feed rate. Therefore, it is extremely difficult to automatically control the rotating body 7 to follow the displacement of the seam weld.

Furthermore, when replacing or maintaining the matching transformer 14 and inductor 9, which are heavy objects, they must be lifted up to be removed from the revolving structure 7.
For this reason, a lifting device was required.

Furthermore, since the matching transformer 14 is mounted on the rotating structure 7, the length of the connecting conductor portion 9a of the inductor 9 with the matching transformer 14 must be increased.
The power loss in this connecting conductor portion 9a was large.

The present invention was made in order to solve the above-mentioned problems, and its purpose is to be able to accurately and stably turn a rotating body at a constant speed, and to make the turning angle of the rotating body sufficiently large. Furthermore, it is equipped with a rotating means that is highly reliable and durable in operation, and allows for easy replacement and maintenance of matching transformers and inductors without the use of lifting equipment. The purpose is to provide tube heating equipment.

E Means for solving the problem The structure of the present invention to achieve this purpose is as follows:
In an ERW tube heating device that causes an inductor to follow the twist of a seam weld in order to induction heat the seam weld while conveying the ERW in the axial direction of the ERW, an arcuate guide rail disposed above a conveyance means for conveying the electric resistance welded tube in the axial direction thereof so as to be coaxial with the electric resistance welded tube conveyed on the conveyance means; an elevating means for raising and lowering; a rotating body movably attached to the guide rail via wheels that sandwich the guide rail; and an arcuate structure fixed to the rotating body and having the same center as the guide rail. a rack, a pinion that is rotatably attached to the guide rail or a member that moves integrally with the guide rail, is connected to a driving means and meshes with the rack, and is provided on the revolving body so as to be movable up and down and guided to the lower end. and a matching transformer having a child.

F Function First, in order to align the axis of the electric resistance welded tube to be heated with the center of the guide rail or arcuate rack, the guide rail is raised and lowered using the lifting means. Next, the pinion is rotated by the drive means to move the arcuate rack in the circumferential direction, thereby moving the revolving body along the guide rail so that the inductor faces the seam weld. Thereafter, the matching transformer attached to the revolving body is moved up and down, the gap between the seam weld and the inductor is adjusted, and induction heating of the seam weld is started.

The electric resistance welded tube is conveyed in the axial direction by the function of the conveying means, and the seam welded portion is heated by induction by the inductor and then, for example, slowly cooled and annealed. When the ERW pipe rotates during transportation, the seam weld moves in the circumferential direction, but this movement is detected by a detection means that detects the seam weld, and a command based on this movement is sent to the drive means. Given. Then, the revolving body moves along the guide rail by the action of the rack and pinion, and the inductor moves toward the seam weld that has moved in the circumferential direction. In this way, the inductors move in accordance with the displacement of the seam weld and are always opposed to each other, so that even if the electric resistance welded tube rotates, the seam weld is reliably heated. The matching transformer and the inductor can be easily replaced or maintained by lowering the matching transformer from the revolving structure.

G. Embodiments Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

As shown in FIG. 1, a plurality of rotatable rollers 15 are lined up in a direction perpendicular to the plane of the paper, and a conveying means 16
It consists of

On the other hand, in the vicinity of the conveyance means 16, a movable table 18 is installed which is movable in the vertical direction and in the horizontal direction perpendicular to the axis of the electric resistance welded tube 17a carried on the rollers 15, and constitutes the elevating means 52. ing. That is, a second base 20 is provided on a first base 19 so as to be slidable in the horizontal direction in the figure, and a threaded rod 21 that is threadedly engaged with the female thread of the second base 20 is fixed on the first base 19. 22. Further, the lower ends of four guide rods 24 are fixed on the auxiliary member 23 fixed on the second base 20, and the upper ends of the guide rods 24 are connected to the guide holes 25 of the auxiliary member 25 fixed on the lower surface of the movable table 18. is inserted into. A threaded rod 26 screwed into the center of the auxiliary member 25 is connected to a motor 28 on the second base 20 via a pair of bevel gears 27.

The movable table 18 as a component of the elevating means 52 is divided into a movable table 18a on the front side and a movable table 1 on the other side in the figure.
8b, and arc-shaped guide rails 30a and 30b are screwed inside each of them. The guide rails 30a and 30b are the electric resistance welded pipes 17a.
By moving the movable tables 18a, 18b, the centers of the guide rails 30a, 30b can be aligned with the axis _O1 of the electric resistance welded tube 17a.

In this embodiment, a lifting means 5 is provided on one side of the conveying means 16.
However, as shown in FIG. 2, an elevating means may be provided so as to straddle the conveying means, and a guide rail may be placed on this elevating means.

A casing 31 as a revolving body is disposed between the pair of guide rails 30a, 30, and the casing 3
Four rotatable wheels 32 provided on both sides of 1.
The housing 31 is attached to the guide rails 30a, 30b in a state where the housings 31 are sandwiching the guide rails 30a, 30b, respectively. The wheel 32 includes a large diameter portion formed on the outside to prevent the wheel from coming off the guide rail, and a small diameter portion that rolls on the guide rail. A downwardly opening space is formed inside the housing 31, and an arcuate rack 33 is screwed to the surface below the guide rail 30a and on the near side in the figure. The rack 33 has teeth on its outer peripheral surface, the center of which is aligned with the center of the guide rail 30a. On the other hand, a pinion 35 is rotatably attached to the movable table 18a via a stay 34, and the pinion 35 is engaged with the rack 33. The pinion 35 is connected via a pulley 36, a belt 37, and a pulley 38, which are integrated with the pinion 35, to a motor 39 as a driving means provided on the movable table 18a.

A matching transformer 4 is installed inside the housing 31 so that it can be raised and lowered.
0 is housed therein, and an inductor 41 is attached below the matching transformer 40. With such a configuration, the length of the connecting conductor portion 41a of the inductor 41 to the matching transformer 40 can be shortened. As shown in the figure, a matching transformer 40 is attached via a pin 43 to the lower end of a threaded rod 42 that vertically penetrates the housing 31, and a nut gear 44 having a female thread and bevel teeth is attached to the threaded rod 42. It's screwed in. A bevel gear 46 of a motor 45 mounted on the housing 31 is engaged with the nut gear 44 . Note that 47 is a plurality of guides provided on the inner surface of the housing 31 for raising and lowering the matching transformer 40, and is slidably engaged with the outer peripheral surface of the matching transformer 40.

The matching transformer 40 connects the flexible cable 4
8, a matching capacitor group 49 provided on the moving table 18, and a connecting conductor 50, which are connected to a power source (not shown).

Next, the operation of such an electric resistance welded tube heating device will be explained.

First, in order to align the center of the guide rails 30a, 30b or the rack 33 with the axis _O1 of the electric resistance welded tube 17a, the motors 22 and 28 are rotated to move the movable table 18 in the vertical and horizontal directions in the figure. When the threaded rod 21 is rotated by the motor 22, the threaded rod 2
The second base 20 that is screwed into the second base 20 slides on the first base 19 in the left-right direction in the figure, and when the threaded rod 26 is rotated by the motor 28, it moves together with the auxiliary member 25 to which the threaded rod 26 is screwed. Base 18 is guide rod 2
4 and the guide hole 29.

The center of the guide rails 30a and 30b is the axis O ₁
When it matches, rotate the motor 39 and
The inductor 41 is placed directly above the seam welded portion 51 of a. The rotational force of the motor 39 is transmitted to the pulley 38, belt 37, pulley 36, and pinion 35,
The rotation of the pinion 35 causes the rack 33 to move in the circumferential direction. The rack 33 is integrated with a housing 31, and the housing 31 has guide rails 30a,
Since the housing 31 is movable along the rack 30b, the housing 31 also moves in the circumferential direction together with the rack 33.

In this way, the inductor 41 connects to the seam weld 51.
When the position is directly above the inductor 41, the seam weld 51, and the gills are adjusted by rotating the motor 45.
When the motor 45 is rotated, its rotational motion is transmitted to the nut gear 44 via the bevel gear 46, and the rotation of the nut gear 44 moves the matching transformer 40 and the inductor 41 up and down together with the threaded rod 42.

When the relative position between the seam welded portion 51 of the ERW tube 17a and the inductor 41 has been adjusted as described above, the inductor 41 is energized while the ERW tube 17a is being conveyed to perform induction heating.

The electric resistance welded tube 17a conveyed on the rollers 15 rotates about the axis _O1 during conveyance, and the seam welded portion 51 may move in the circumferential direction. The electric resistance welded pipe heating device is equipped with a welding part detection device (not shown), which detects the movement of the seam welded part 51 and gives a command to the motor 39 based on the detection result. When the motor 39 rotates by the amount of command received, the rack 33 rotates as described above.
rotates around the axis O ₁ , and the inductor 41 faces the seam weld 51 . In other words, the inductor 41
moves to follow the movement of the seam weld 51 in the circumferential direction while maintaining a constant gap with the seam weld 51, thereby heating the seam weld 51 under constant conditions. . And 32 wheels
Since the housing 31 is sandwiched between the guide rails 30a and 30b from above and below, the movement of the housing 31 is stable over a wide range, and since the power is transmitted by the rack 33 and the pinion 35, the rotation speed of the motor 39 and the induction are stable. The amount of movement of the inductor 41 is always in a constant relationship, and the inductor 4
1 follows the seam weld 51 accurately. In addition,
Welding part detection devices include those that detect surface shapes and those that detect residual heat during welding.

Next, a case will be described in which the small diameter electric resistance welded tube 17b is heated. In this case, the axis is O ₂ , so
As described above, align the centers of the guide rails 30a and 30b with _O2 , and connect the electric resistance welded pipe 17b and the inductor 41.
Adjust the gap. Other functions are the same as those for the large-diameter electric resistance welded tube 17a, so explanations will be omitted.

When it becomes necessary to replace the inductor 41 or inspect or remove the matching transformer 40, the threaded rod 42 is removed by the motor 45 with no electric resistance welded tube below.
The inductor 41 can be easily replaced by moving the matching transformer 40 downward, or by taking out the matching transformer 40 below the housing 31 and removing the pin 43, it can be easily moved to another location and replaced. can. This facilitates maintenance work without the use of lifting equipment.

If a casing is used as the revolving body as in this embodiment, and the matching transformer is housed in the casing so as to be movable up and down, magnetic shielding and soundproofing effects can be obtained for the matching transformer. Furthermore, the length of the connecting conductor portion of the inductor with the matching transformer is shortened, and as a result, power loss in this portion is reduced and the strength of the inductor is increased.

Note that when setting the elevating means 52, the conveying means 1
The axis of the ERW tube on 6 and the guide rails 30a, 30
If the center of b is aligned in the horizontal direction, the second base 20, threaded rod 21, and motor 22
may be omitted.

Further, in this embodiment, the motor 3 as a driving means
9 and the pinion 35 are connected via the belt 37 or the like, but they may be connected by combining gears or the like.

Further, in this embodiment, a stay 34 is attached to the movable table 18a.
The pinion 36 is rotatably attached via the guide rails 30a, 30b or a member that moves integrally with them (for example, an extension of the guide rail).
It may also be attached to the drive means and connected to the drive means.

Further, in this embodiment, a downwardly opening casing 31 is used as the revolving body, but the present invention is not limited to this, and for example, a frame may be used as the revolving body and a matching transformer may be attached to the frame so as to be movable up and down.

H. Effects of the invention As explained above, the invention has the following effects.

(b) A revolving body is movably mounted on an arc-shaped guide rail by being held between wheels, and an arc-shaped rack coaxial with the guide rail is integrally fixed to the revolving body and connected to a driving means. Since the pinion is easily engaged, the rotating body can be accurately and stably rotated over a wide range of the guide rail.

(b) Since the matching transformer and inductor are attached to the revolving structure so that they can be raised and lowered, the matching transformer can be moved downwards of the revolving structure for easy maintenance and inspection, and a lifting device is not required.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram showing an embodiment of an ERW tube heating device according to the present invention, and FIG. 2 is a structural diagram of a conventional ERW tube heating device. 16... Conveying means, 17a, 17b... Electric resistance welding tube, 18a, 18b... Moving table, 30a, 30b
... Guide rail, 31 ... Housing, 32 ... Wheel, 33 ... Rack, 35 ... Pinion, 22,
28, 39, 45...motor, 40...matching transformer, 41...inductor, 52...lifting means.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An inductor is made to follow the twist of the seam weld in order to induction heat the seam weld while transporting the electric resistance weld in the axial direction of the electric resistance weld. In the ERW tube heating device, the ERW tube is disposed above the conveyance means for conveying the ERW tube in the axial direction of the ERW tube so as to be coaxial with the ERW tube conveyed on the conveyance means. An arcuate guide rail, a lifting means for raising and lowering the guide rail, a revolving body movably attached to the guide rail via wheels that sandwich the guide rail, and a revolving body fixed to the revolving body. an arcuate rack having the same center as the guide rail; a pinion rotatably attached to the guide rail or a member that moves integrally with the guide rail; a pinion connected to a driving means; and meshing with the rack; 1. An electric resistance welded tube heating device comprising a matching transformer that is movable up and down and has an inductor at its lower end. (2) The electric resistance welded pipe heating device according to claim 1 of the utility model registration claim, characterized in that a casing that opens downwardly is used as a revolving body, and a matching transformer is housed in the casing so as to be movable up and down. .