JPS62276786A - Coil apparatus for induction heating of flat plate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] 3. Detailed description of the invention A1 heavy duty use field The present invention relates to a flat plate induction heating coil device.

B1 Summary of the Invention The present invention provides an induction heating coil device for a flat plate to be transported, which includes: a first coil portion having a plurality of conductors extending in the width direction of the flat plate; and a second coil portion each having a pair of conductors extending in the length direction of the flat plate are connected and integrated in the conveying direction of the flat plate.
By arranging magnetic flux type heating coils facing each other on both sides of the flat plate, the temperature distribution in the width direction of the flat plate is made to be almost flat across the entire width of the flat plate including both ends. The following is what you can do.

C0 Prior Art When a flat metal plate being conveyed is inductively heated using primary medium frequency and high frequency power, a heating coil of the orthogonal magnetic flux type is generally used. Referring to FIG. 10, FIG. 10 is a plan view, and FIG. 10 (8) is a side view. In each figure, 1 is a flat plate that is conveyed in the direction of arrow S, and 2 is a heating coil that is disposed on both the upper and lower surfaces of the flat plate 1. The heating coil 2 is made up of a plurality of conductors 6 extending in the width direction of the flat plate 1 and a conductor 4 connecting each conductor 3. Each conductor 6.4 is the 11th
As shown in the enlarged perspective view of the figure, it is constructed in the shape of a vibrator with six cooling water holes, and its cross-sectional shape has an arbitrary shape such as a light angle. 7 is power to heating coil 2? Medium frequency of supply friend 7? + is a high frequency power supply.

Therefore, the flat plate 1 is also chained to the magnetic flux generated when the alternating current l flows through the upper and lower coil conductors 3.3.
An induced current flows through and heats up. The flat plate 1 is successively heated while being transferred in the direction indicated by arrow S.

Figures 1 and 13 show an induction heating coil device according to Utility Application No. 39989 of 1988, which is the applicant's earlier application. In the figure, the heating coils 8 are arranged in two reciprocating conductor loops in the width direction of the flat plate 1 (however, the conductor loops located at both ends
(excluding <) and are formed so that the current direction is the same. In the example shown in the figure, the conductor 30'f facing the flat plate 1
Later, a 5t iron core was installed to prevent the leakage of magnetic flux φ and concentrate the magnetic flux. I'm counting. FIG. 14 is an enlarged perspective view thereof.

Thus, when two conductors 3TF arranged in the upper and lower surfaces of the flat plate 1 and a current i flow in the nine-fold width direction, an induced current flows through the flat plate 1 due to the magnetic flux φ, and the flat plate 1 is heated.

D0 Problems to be Solved by the Invention By the way, FIG. 12 shows an example of the degree distribution in the width direction of the flat plate 1 heated by the heating coil 2 of FIG. 10. FIG. 15 shows an example of the temperature distribution in the width direction of the flat plate 1 heated by the primary heating coil 8 of FIG. 13.

In each case, 2) indicates the temperature at the edge portions at both ends of the flat plate 1, C) indicates the temperature at the center, 2), and 2 indicate the temperature at the t portion a little further inside than the edge portions. As can be seen from the figure, it is very difficult to achieve a flat temperature distribution across the width of the flat plate 1, especially at both ends of the flat plate 1, which correspond to discontinuities where the plate no longer exists. Near the section (first
(Fig. 0) (parts indicated by symbols P and Q in Fig. 13 (4)), the distribution state of magnetic flux changes, etc.
(B) The U portion is not effectively heated and becomes a low temperature portion. Such non-uniformity in temperature adversely affects subsequent processes.

In order to improve the temperature distribution near the edge of the flat plate 1 and approach a flat i degree distribution, in Fig. 10 (4), the length L of the conductor 3 with respect to the flat & 1 plate @W is 13th
11(4), the temperature distribution near the edge has been improved by adjusting the length t of the iron core 5. However, it is still very difficult to achieve a flat temperature distribution across the whole range.
This is especially difficult when the plate thickness is as thin as several nanometers or less. For example, when heating the flat plate 1 to about 600 DEG C., it is difficult to uniformly heat the plate 1 with a temperature difference of 30 to 40 DEG C. or less across the entire width using conventional induction heating using medium or high frequencies.

The present invention solves and improves the above-mentioned problems.

E1 Efficient Means for Solving the Problem The present invention provides an induction heating coil device using medium frequency or high frequency waves for a flat plate to be conveyed. A first coil portion having a conductor to be connected, a conductor extending in the length direction of the flat plate inside the ends on both sides in the plate width direction of the flat plate, and a conductor in the plate width direction connecting the pair of conductors. The second coil portion and the upper flat plate are integrally connected in the conveying direction to form [5I: magnetic flux type heating coils, and the heating coils are arranged facing each other on both sides of the flat plate and are connected to a power source. This is the t-W sign.

b゛99 The working coil part heats the flat plate in the width direction of the plate, and the second coil part heats the flat plate slightly inward from the edge part. , it is possible to intensively heat the low-temperature areas and uniformly heat the entire width of the board.

G. EXAMPLES The present invention will be explained below based on the examples shown in FIGS. 1 to 9. It should be noted that the same parts as those in the prior art will be described with the same reference numerals V'i.

FIG. 1 shows a first embodiment. 1 Heating coil 6 shown in the diagram
0 is formed by integrally connecting the first coil portion 9 and the second coil portion 10 in the conveying direction of the flat plate 1. The first coil portion 9 has the same construction as the heating coil 2 shown in FIG. 1. On the other hand, the second coil portion 10 is provided slightly inside the end of the flat plate 1 in the plate width direction, and consists of a conductor 11 extending in the length direction of the flat plate 1 and a conductor 12 in the plate width direction. It is a turn coil, and one conductor 12 in the board width direction is the first coil portion 9. End conductor 1.
It is connected and integrated with 4℃. However, the end conductors of the first coil part 9 and the second coil part 1o are connected to the medium frequency power source 7 by means of leads 16.17. The conductors 3 and 11.12 are shown in an enlarged view in FIG. 11 and, like the conductor 3, are formed in the form of pipes having all the cooling water holes 6. These first coil portion 9 and second coil portion 1
Heating coils 3o consisting of 0 are provided facing both the upper and lower surfaces of the flat plate 1.

In the above-mentioned first embodiment, the flat plate 1 is heated by the first coil part 9 in the m degree distribution shown in FIG. Since the conductor 11 is provided in each, the induced current also flows inside the edge, and as shown in the second figure (B), the G and I parts inside the edge part of the Kunihira 1 (this is the B, I part in the second figure) The portion corresponding to D] is heated intensively.

Therefore, #A of the flat plate 1 which is heated by the first coil portion 9 and the second coil portion 10 and comes out from the second coil portion 10t.
The temperature distribution in Figure 2 (■) is divided into a nearly flat temperature distribution as shown in Figure 2 (C). Obtainable.

FIG. 3 shows a second embodiment. Heating coil 61 shown in the same figure
is formed by integrally connecting the first coil portion 81, the second coil portion 15, and the T flat plate 1 in the conveyance direction. The first coil portion 81 is similar to the heating coil 8 shown in FIG. 13. In other words, the conductors 6 in the width direction of the flat plate 1 other than both ends thereof are arranged in a square pattern of two reciprocating conductors, and are formed so that the current direction is the same, and the iron core 5 is provided behind the conductor 3. The second coil portion 15 is the conductor 11 of the #g2 coil portion 10 of the first embodiment.
A 13-ton iron core is installed behind it in a similar configuration. Thus, the first coil portion 810 has two end conductor portions 18.19, and the second coil portion 150 has two end conductor portions 32.19.
33 and are integrated. Then, the other end conductor portion 34.35 of the first coil portion 81 is at the middle circumference.
The box is connected to a high frequency power source 7.

Also in the second embodiment, an example of the temperature distribution in the board width direction due to the conductor 3 of the first coil portion 81 is shown in fXz diagram (4), and this temperature distribution is
This will be compensated by the heating temperature distribution as shown in Figure ω). Therefore, the @summer distribution of the flat plate 1 when the second coil portion 15 is discharged is a nearly flat temperature distribution as shown in the second diagram) by adding these values together.

Next, a third embodiment shown in FIG. 4 will be described. The heating coil 66 of this embodiment has almost the same construction as the first embodiment shown in FIG. 1, but the following groove bottoms are different. That is, the pair of left and right conductors 11.11 extending in the length direction of the flat plate 1 of the second coil portion 10 of the heating coil 36 are provided movably with respect to the conductor 12.12 extending in the plate width direction. ing. Conductor 12.1 extending in the width direction of this friend plate
2 and the conductor 11.11 extending in the longitudinal direction of the flat plate are connected by movable connecting parts "l"t, Tt, Ts, T4, the specific configuration of which is shown in FIGS. 5 to 7. It has become.

The movable coupling portions Tt and Ttt will be described below with reference to the figures. A mounting 7 flange 20 having a long hole 21 is provided along the conductor 12, while 7 flange 22 having a tapped hole is also provided at both ends of the conductor 11. Then, the 7 langes 20.22 km of each of the conductors are aligned, and then the conductors 11 are passed through the long holes 21 and loosened by tightening the bolts 23yk. It is movable and can be tightened and fixed in any position.

Cooling water holes 27 and 28 of conductors 11 and 12 are both closed at the end face of each conductor. On the other hand, a water passage nozzle 24° 25 is provided on the side surface of each conductor 11 and 12 and communicates with the cooling water holes 27 and 28, and a hose 26 is connected to this water passage nozzle 24° 25. ing. Next, the hose 26 and water nozzle 24.2
Cooling water flows through the movable cooling water holes 27 and 28 of the conductors 112 and 12 through the cooling water holes 27 and 28 of the movable conductors 112 and 12 to cool each conductor.

The movable connecting parts T, , T, , T, , of the above structure
T, is a flat plate 1t - each conductor 1 placed on both sides of the 7
1.12 is similarly arranged.

According to the third embodiment, there are the following effects.

That is, the low-temperature heating area (second
The distance Uti between the conductors 11 of the second heating coil 10 corresponds to the occurrence position of portions B and D in the first case. 14! ! L'
It is easier to obtain a flat temperature distribution by aligning the position of the concentrated heating section M (FIG. 2, CB) and the position of B and D above. In addition, the width of the 10 flat plates that are the heated materials has been changed, and the 1st coil, which is the first stage coil, has been changed.
Low temperature heating part by coil part 9 (B in the 21st prisoner,
0 part) changes. Therefore, in this case, the movable connecting portion T of the second coil portion 10, which is the second stage coil,
Either T, t or Ts, Ta, loosen both bolts 23, move the pair of left and right conductors 11t to change the conductor spacing U, change the low temperature heating part, and move conductor 1 to position 7.
1t - Can be moved and set. In addition, conductor 1
The above-mentioned structure (not limited to the structure using bolts and elongated holes,
For example, as shown in FIG.
A method such as tightening and fixing using JL40 may also be used.

FIG. 9 shows the fourth refreshing example. Heating coil 3 of this example
Reference numeral 9 has almost the same configuration as the heating coil 31 of the second embodiment shown in FIG. The difference from this is that a pair of left and right conductors 11 extend in the direction of the plate of the second coil portion 15.
．． 11 and the conductor 12 and 12 in the plate width direction are connected to the movable connecting part T+
, Tt , Ts , TI . The structure of this movable connecting portion is the same as the structure shown in FIGS. 5 to q described in the third embodiment.

The effects of the 3rd percent example will be explained. First, by providing the iron core 5.131- behind the conductor 3.131, the first. This is the same as the second embodiment in that the leakage of magnetic flux due to the cross current i flowing through the second coil portion 81.15t'' is reduced and the concentration of magnetic flux is improved, so that the heating efficiency can be improved. 11 and 12 movable connecting parts T, , Tt,
T, , T, ■The structure and effect are the same as in the third embodiment.

In addition, in FIGS. 4 and 9, each conductor 11 and 12 is 4
Q is connected by the movable connecting parts Ta, Tt, Ts, Ta. Although the example shown is not limited to this, at least the movable connecting parts T, , T, 17t are connected by the movable connecting parts T, , T,
If either one of them is made a movable connecting part, the zero interval Ui between the pair of left and right conductors 11 can be freely adjusted.

As shown in the first to fourth embodiments above, the first coil portion 81
．． By induction heating the flat plate 1 being conveyed using a heating coil device t' consisting of a combination of a coil portion 9 and a second coil portion 10.15,
When a thin steel sheet metal is heated to 600°C, it can be heated uniformly with a flat temperature distribution with the temperature difference in the width direction of the sheet within approximately 20°C.

H1 Effects of the Invention As described above, when using the heating coil device according to the present invention, in induction heating of a flat plate, due to the difficult temperature distribution in the width direction of the plate, it is possible to heat the entire plate in the width direction including both ends of the plate. It is possible to make the degree distribution nearly flat. In addition, since the first coil part and the second coil part that make up the heating coil are integrally grooved, the heating coil can be made more compact, and a flat plate can be heated within a short heating length, thus improving heating efficiency. I could do the same.

[Brief explanation of drawings]

Figures 1 to 9 show the entire heating coil device according to the present invention,
Figure 1 is a plan view of the first embodiment, Figure 2 (4) is a temperature distribution diagram of the nine plates heated by the first coil part of the first cooling example, and Figure CB) is a diagram of the temperature distribution in the second coil part. Fig. 3 (C) is a temperature distribution diagram of the flat plate heated by the 1st and 2nd coil parts, and Fig. 3 (Fig. 3) shows the plan view and side view of the second embodiment. 4 is a plan view of the third embodiment,
Figure 5 shows the movable connecting portion T1 in Figure 4. T, a detailed plan view of T, the sixth part is a new view taken along the Y-Y line in Figure 5, the seventh figure is a cross-sectional view showing the other side of the movable joint, Figure 9 is a plan view of the fourth example, Figure 10 (4), CB
) First plan view and side view of a conventional heating coil, first
Figure 1 is a perspective view of the conductor, Figure 12 is a temperature distribution diagram of the flat plate heated by the heating coil, and Figure 13 is a diagram of the temperature distribution. (8) is a plan view and a side view of a second example of a conventional heating coil;
FIG. 14 is a perspective view of a secondary conductor with an iron core, and FIG. 15 is a temperature distribution diagram of a flat plate heated by the heating coil. 1... Flat plate, 3, 4, 11.12... Conductor, 81°9... First coil part, 10.15... Second coil part, 30, 31.36.39... heating coil. Figure 14 Figure 15, Width of weapon plate W-11!

Claims (1)

[Claims] A coil device for induction heating using medium or high frequency waves for a flat plate being conveyed, comprising: a first coil portion having a plurality of conductors extending in the width direction of the plate, and a conductor connecting these conductors; A conductor extending in the length direction of the flat plate and a second coil portion having a conductor in the plate width direction that connects the pair of conductors are connected inside the ends of both sides in the plate width direction of the flat plate in the conveying direction of the flat plate. 1. An induction heating coil device for a flat plate, characterized in that the heating coils are integrally connected to form orthogonal magnetic flux type heating coils, and the heating coils are arranged facing each other on both sides of the flat plate and are connected to a power source.