JPH0644068Y2 - Induction heating joining device - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to an improvement of an induction heating bonding apparatus for butt-joining pipes.

B. Outline of the Invention The present invention is an induction heating joining device for matching and aligning tubular bodies with each other. An output transformer connected to a power source by a flexible means for power supply includes a temperature raising coil portion and a heat retaining coil portion. It is configured to move along the orbit around the abutting part by connecting and fixing the fixed part, and the moving heating operation causes each part to sequentially melt the amorphous metal in the temperature increasing coil part, and the heat retaining coil part. The soaking treatment is performed by heating the above, and good joining is achieved.

C. Conventional technology Generally, an amorphous high-speed joining system is used as one of the butt joining means for joining tubular bodies.

This principle is to perform joining by sandwiching a low melting point material such as amorphous material and heating the joining portion by high frequency induction heating to diffuse the amorphous metal in a solution state.

Conventionally, an induction heating bonding apparatus as illustrated in FIGS. 6 to 8 has been used in an amorphous high speed bonding system.

The apparatus shown in the figure has a ring-shaped amorphous metal 9 shown in FIG.
It is to be installed in the associated part 5. That is,
The clamper 3 is fixed to the end portion of the one tube body 1, and the clamper 4 is also fixed to the end portion of the other tube body 2. One clamper 3
And the other clamper 4 are connected by a plurality of connecting rods 8 so that the ends of the tube body 1 and the tube body 2 are held in abutment with each other through the amorphous metal 9.

An induction heating coil 6 having a one-turn configuration is arranged at a portion 5 where the end openings of the tube body 2 are butted. A high frequency power supply device 7 is connected to the induction heating coil 6.

In order to perform the induction heating joining work with the above apparatus, the following is performed.

High frequency power is supplied from the high frequency power supply device 7 to the induction heating coil 6 to heat the butted portion 5.

The heating at this time is, as illustrated in FIG. 7, performed by heating to a joining temperature, for example, about 1200 degrees Celsius in the temperature rising process, and then soaking at the joining temperature. In this soaking treatment, the value of the current supplied to the induction heating coil 6 is adjusted to heat at a substantially constant temperature. During soaking time, the molten amorphous metal 9 is brought into contact with the tubular body 1 and the tubular body 2. It is set so that it diffuses into the base material of the portion 5 to form a strong and excellent joint.

D. Problems to be Solved by the Invention In the conventional induction heating bonding apparatus as described above, in the case of an apparatus for bonding pipes 1 and 2 to be bonded having relatively small diameters, the device capacity is small and the coil, etc. The size and weight are small and can be portable. Therefore, it is possible to bring this joining device to a construction site or the like and set it at each joining point to perform joining work.

However, if the pipes to be joined are steel pipe piles, etc. and have a large diameter (for example, diameter 1300 mm), the induction heating coil is arranged on the outer periphery of the conventional pipe described above to cover the entire periphery of the pipe. In the apparatus for simultaneously heating and joining, the power supply unit needs to have a large capacity and a large size, and the induction heating coil also becomes large and expensive. When using such a large-sized joining device, there is a problem that it may cause troubles in transportation, work at a site (mountain slope, etc.), and the like.

The present invention has been made in view of the above points, and an object of the present invention is to newly provide a small-sized and small-capacity, yet inexpensive induction heating joining apparatus capable of joining large-diameter tubes.

E. Means for Solving the Problems The induction heating joining device of the present invention connects and fixes the temperature raising coil part and the heat retaining coil part to the output transformer, and at the same time, is a flexible device for supplying power from the power source to the output transformer. It is characterized in that the means to which the means is connected is configured to be movable on a circular orbit installed around a butt portion to be joined.

F. Action With the above-described configuration, the opposing positions of the heat-retaining coil portion, to which high-frequency power is supplied while moving, and the temperature-raising coil portion are sequentially induction-heated, and the temperature-raising coil portion is heated to raise the amorphous temperature. The metal is melted and subjected to soaking for holding for a certain period of time while the temperature is maintained by heating the heat retaining coil portion, and the amorphous metal is diffused and bonded to the base material of the tubular body.

C. Example Hereinafter, an example of the induction heating bonding apparatus of the present invention will be described with reference to FIGS. 1 to 5. In addition, this FIG. 1 thru | or 5
In the figure, parts corresponding to those of the conventional example shown in FIGS. 6 to 8 are given the same reference numerals, and detailed description thereof will be omitted.

1 to 3 showing the main parts of the induction heating connection device,
Reference numerals 1 and 2 are pipes, 3 and 4 are clampers, 5 is an abutting portion, and 8 is a connecting rod.

In the figure, the abutting portion 5 of the tubular body 1 and the tubular body 2 is in a state of abutting with the amorphous metal 9 interposed at the end openings to be joined to each other. One clamper 3 is installed near the butted portion 5 of the pipe body 1, and the other clamper 4 is installed near the butted portion 5 of the pipe body 2,
A plurality of connecting rods 8 are installed between the two clampers 3 and 4, and the ends of the connecting rods 8 are fastened with nuts 10 to maintain the abutted state shown in FIG.

As shown in FIGS. 2 and 3, a track 11 is installed on the lower surface of the clamper 3, and an induction heating coil unit 12 that automatically travels on the track is attached.

The track 11 has a ring shape as a whole, and includes a track frame body 16 integrally fixed to a base material 15 fixed to the lower part of the clamper 3 with bolts 13 and nuts 14.

As shown in the drawing, the raceway frame body 16 is formed in a shape in which a part of a raceway surface portion 17, which corresponds to a lower bottom surface portion of a rectangular frame in cross section, is cut out.

The raceway surface portion 17 rolls and supports the wheels 18 of the induction heating coil portion 12.

The induction heating coil unit 12 includes a hook-shaped portion 21 at the free end of the support arm 20 in the traveling device attached to the output transformer 19.
Is placed in the inner space of the track frame body 16, drives the wheels 18 attached to the hook-shaped portion 21, rolls on the track surface portion 17 and is installed so as to be movable along the track frame body 16. is there.

The output transformer 19 is provided with a cable bear 23 having a built-in high-frequency power supply cable and a cooling water supply hose, and a coil portion 22 is integrally installed.

The coil portion 22 is composed of a temperature raising coil portion 24 and a heat retaining coil portion 25, the details of which are as shown in FIG. That is,
The temperature raising coil portion 24 is formed by folding back and bending a narrow coil conductor as shown in the drawing. One end of the temperature raising coil portion 24 is fastened to the output transformer side conductor 30 with a bolt 26 and a nut 27, and the other end is kept warm. A bolt 28 and a nut 29 are fastened to one end of the portion 25.

The heat retaining coil portion 25 is formed by forming a thick coil conductor into a substantially U-shape, and one end thereof has the temperature raising coil portion 24 as described above.
Fasten to the end of the output transformer side conductor 31
Are fastened with bolts 32 and nuts 33.

In the rear part of the coil conductor corresponding to the butted portion 5 in the temperature increasing coil portion 24 and the heat retaining coil portion 25,
The silicon steel plates 34 and the like are laminated and arranged so as to concentrate the magnetic flux.

By configuring as described above, the temperature raising coil unit 24,
The electric power is appropriately distributed to the heat retaining coil section 25 so that the temperature raising and heat retaining processes can be appropriately executed.

The temperature raising coil section 24 and the heat retaining coil section 25 are adjusted by changing the fastening angle state of the screw fastening portions at their respective ends to change the connection angle between the temperature raising coil section 24 and the heat retaining coil section 25. Three
As shown in the figure, it is set so as to correspond to the curvature of the outer peripheral surfaces of the tubular bodies 1 and 2.

Next, the operation of the apparatus of this example configured as described above will be described.

The apparatus of this example is such that the induction heating coil portion 12 is wound around the abutting portions 5 of the pipes 1 and 2 to perform induction heating and joining. Now, looking at the one-point portion where the butted portion 5 is present, as shown in FIG. 5, when this portion reaches the position where the temperature rising coil portion 24 that surrounds this portion faces, this portion The part is heated to a predetermined temperature and the amorphous metal 9 is melted. Subsequently, the heat retaining coil portion 25 reaches a position facing this portion, and the melted amorphous metal 9 is diffused and properly joined in a soaking state in which a predetermined temperature is maintained for a certain period of time while passing therethrough.
After that, the induction-heated portions are naturally cooled and properly joined.

That is, the abutting portion 5 of the tubular bodies 1 and 2 is such that each point of the abutting portion 5 sequentially passes through the temperature history profile as shown in FIG.
The joining over the entire circumference is completed.

H. Effect of the Invention As described in detail above, according to the induction heating joining device of the present invention, a pipe to be joined along an orbit of an induction heating coil portion having a small heating coil portion and a heat retaining coil portion. Since it is configured to circulate around the abutting part of the body with the amorphous metal interposed, the heating coil part to which high-frequency power is supplied while moving and the facing position of the heat-insulating coil part are sequentially induction-heated and raised. Amorphous metal whose temperature has been raised in the warm coil is melted, and soaking is performed by heating the heat retaining coil to hold it for a certain period of time, and the amorphous metal is diffused into the base metal of the tubular body, so a good joint is obtained. The effect is that you can.

Furthermore, even in the case of joining pipes having different diameters, it is possible to carry out by simply changing the track portion of this device, and there is an effect that it can be easily adapted to pipes of various diameters. In addition, the small-capacity and small-sized power supply device and the induction heating coil section can join a large-diameter pipe, and the device can be easily carried and handled.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part showing an embodiment of the induction heating bonding apparatus of the present invention, and FIG. 2 is an enlarged vertical sectional view of the main part of the apparatus.
FIG. 3 is a sectional plan view taken along the line AA of FIG. 2, FIG. 4 is an enlarged perspective view showing the temperature raising and heat retaining coil portion, FIG. 5 is a temperature history curve explanatory diagram of the joint portion, and FIG. 6 is conventional. FIG. 7 is a schematic perspective view illustrating an induction heating connection device for a tubular body, FIG. 7 is a temperature history curve explanatory diagram of a joint portion thereof, and FIG. 8 is a front view illustrating an amorphous metal (example of foil). 1,2 …… Tube, 5 …… But part, 9 …… Amorphous metal, 11 …… Orbit, 12 …… Induction heating coil part, 16 ……
… Track frame, 18 …… Wheels, 19 …… Output transformer, 20 ……
Support arm, 22 ...... coil part, 23 ...... cable bear, 24 ...... temperature rising coil part, 25 ...... heat insulating coil part.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. An induction heating coil for partial heating, which is movably along a circular orbit or the like arranged on a clamper, is connected and fixed to an output transformer and has a temperature raising coil portion and a heat retaining coil portion. An induction heating joining device, characterized in that the tubes are butt-joined by moving induction heating in which a power source is supplied to the output transformer by a flexible means.