JPS6139479A - Method of constructing circuit of both-side heating coils - 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 (Industrial Application Field) The present invention is applicable to cases where a strip or plate material is continuously fed and heated on both sides, or when two relatively close end faces of a block material are simultaneously heated. The present invention relates to a coil circuit configuration method for an induction heating coil used for.

(Prior art) When a large current is required for heating, such as when inductively heating both sides of a strip or plate material by continuously feeding it, or when induction heating two relatively close end faces of a block material, etc. Two heating coils, each connected to a separate power source, are placed opposite each surface to heat the surface to be heated, and when heating does not require a large amount of power, heating conductors are placed opposite each surface to be heated. There is a method in which heating is performed using a heating coil provided, but in the latter case, the circuit configuration of the heating coil has conventionally been constructed using a coil circuit configuration method as shown in FIG.

In FIG. 2, a heating coil C' that heats both sides of a strip material W, for example, drawn by a thin line, is located at a branch point provided on the output side of a lead portion R1 connected to an output terminal e1 of one pole of a power source E. Heating conductors c'l and c'2 facing both sides of the material to be heated W whose winding ends are at the branching point t'2 of the lead portion R2 connected to the output terminal e2 of the other pole. Heating is performed using a single coil consisting of a coil circuit that connects heating conductors in parallel.

It's according to the law.

(Problems to be Solved by the Invention) When a conventional coil circuit configuration method is adopted in which power is supplied by connecting the heating conductors facing both sides of the material to be heated in parallel as described above, the reheating conductor is connected in series to the coil circuit. A coil current whose current value is twice that of the case where the coil is connected flows. In other words, when using a power supply with the same output, twice the current required means that the output voltage is halved, and it is different from the high voltage and low current equipment that is used as general heating equipment. In comparison, the conventional parallel connection method has lower heating efficiency than the series connection method. However, due to the shape of the spacing between the heating conductors, it is considered impossible to configure a series-connected coil circuit, and therefore a power supply with a corresponding output current is required, and this is not the norm. Ta.

However, increasing the size of equipment to the extent that it reduces heating efficiency is a waste of capital investment, and when using a parallel connection configuration, the shape and dimensions of each reheating conductor and the formation and processing of connection points are Unless sufficient care is taken, disadvantages may occur, such as differences in the coil currents of the respective heating conductors, resulting in temperature differences in the heating effect on, for example, the upper and lower surfaces of the heated material.

Moreover, when a coil current with a large current value flows, the contact portions are severely worn out and the service life is shortened. Furthermore, the conventional heating coil C' is a wound heating conductor c '1 ・c ''
2. Branching point t'1-t'2. and lead parts R1 and R2
Even if the same heating conductor can be used for the materials to be heated, if the thickness is different, or if you want to widen or narrow the spacing between the heating conductors, the integral structure will not work. Therefore, it was not possible to deal with the problem, and there were various problems such as having to manufacture a new heating coil.

(Object of the Invention) The present invention solves the above-mentioned problems in the conventional coil circuit configuration method when heating both sides of a material to be heated by sandwiching them between heating coils or multi-turn heating conductors that are supplied with power from a single power source. This was done in order to solve the problems by reducing the coil current, thereby extending the service life of the contact part, and allowing the spacing between the heating conductors to be adjusted immediately if necessary. This provides a heating coil circuit configuration method that is convenient for attaching the heated material to the heating coil.
Structure of the Invention) The technical concept of the present invention resides in a method of configuring a coil circuit in which the connection between the heating conductors in this type of double-sided heating coil is made into a series connection, which has conventionally been considered impossible due to the shape of the heating conductor. That is, (1) when configuring a heating coil circuit that heats the material to be heated by sandwiching it between single- or multi-turn heating conductors from both sides, (2) one side facing one surface of the material to be heated; The heating conductor extends one end of its coiled portion and connects it to one side output terminal of the power source as a lead portion, and the other end is fixedly arranged as a contact terminal structure, and (3) faces the other surface of the material to be heated. The heating conductor on the other side to be arranged is divided into a lead part and a coil part, (4) one end of the lead part is connected to the output terminal on the other side of the power supply, and the other end has a contact terminal structure, (5 ) One end of the winding part has a contact terminal structure that can be joined to the contact terminal structure of the heating conductor on one side, and the other end has a contact terminal structure that can be joined to the contact terminal structure of the divided lead part. (6) When heating, the other side heating conductor is displaced so that the contact terminal structure at one end of the heating conductor is connected to one side. A coil circuit is constructed by connecting the contact terminal structure at the other end of the winding part of the side heating conductor and the contact terminal structure at the other end to the contact terminal structure at the lead part. There is a method of configuring a circuit for a double-sided heating coil.

(Example) A method of configuring a coil circuit for a double-sided heating coil according to the present invention will be described in detail below with reference to FIGS. 1(a) and 1(b) showing an example circuit.

In FIG. 1(a), E is a power source, and el and C2 are both output terminals of the power source E. In FIG. One of the heating conductors cl in the heating coil C of the present invention, which should face one surface of the material to be heated, is formed by extending one end of the coiled portion and forming a lead portion R1, for example, from the power source E.
It is fixedly connected to one side of the output terminal e1, and the other end has a contact terminal structure of a predetermined shape shown as TI. Further, the other heating conductor C2 that faces the other surface of the material to be heated does not have a lead portion formed at either end of the winding portion, but is provided with a lead portion R2 that is separate from the winding portion. One end of the separate lead portion R2 is connected to the other output terminal e2 of the power source E, and a contact terminal structure T3 of a predetermined shape is formed at the other end. Also, Volume C
2 has a contact terminal structure T2 at one end that can be joined to a predetermined shape contact terminal structure T1 at one end of the heating conductor C1, and a contact terminal structure T3 formed at the other end on the output side of the lead portion R2. It has a contact terminal structure T4 that can be joined to. The heating conductor c2 is disposed at a position facing the heating conductor C1 at a predetermined distance, and is displaced in the directions of arrows a-b by a displacement mechanism 9 (not shown), such as a forward/backward movement mechanism such as a hydraulic cylinder. Set to possible.

Is the above contact terminal structure based on the above displacement mechanism? JT1
If T2 and T3 and T4 have a structure that allows them to be joined so that the electrical connection can be made reliably while keeping them in close contact with each other, how should the joining structure be configured, such as planar crimping, fitting crimping, etc. Good too. However, the contact terminal structure T2 of the heating conductor C2. T4 may be simply processed into a flat surface with a predetermined area by simply processing the end itself, and the contact terminal structure of the opposed heating conductor C1 may also be made into a flat surface with a predetermined area and bonded by pressure. However, in such a structure, the coil heating conductor cl during circuit formation,
Since the interval between c2 is fixed, each of both ends of the coiled portion of the other side heating conductor C2 is provided with a structure that can be joined to the opposite contact structure at one end, and a structure that can be connected to the opposite end at the other end. It is preferable to add contact terminal structure members of a predetermined length having a similar structure as the contact terminal structures T2 and T4. For example, in the case of joining T1 and T2, one end of a joining conductor of a predetermined length forms a plane with a predetermined area so that it can be crimped to T1, which has a planar structure, and the other end can be attached to and detached from the heating conductor by bolting, etc. It is like forming a similar structure and tightening it to the end of the heating conductor C2.

Although the embodiment circuit diagrams in FIGS. 1(a) and 1(b) show single-turn coil shapes as the heating conductors C1 and C2, the heating conductors C1 and C2 are not limited to this.
Even if each or either of C1 and C2 has a compound-wound shape, the structure of each end portion remains the same as described above. Of course, it does not matter whether the winding shape is rectangular or circular.

In addition, the displacement mechanism may be any means as long as each heating conductor can be placed with a predetermined gap from the heated surface during displacement, and the opposing contact terminal structures can be joined to maintain a reliable electrical connection. Furthermore, the direction of displacement is not limited to the vertical direction shown by arrows a-b, but may be displacement in a direction perpendicular to the axis of rotation in the direction of the lead R, for example, and the type thereof is not limited.

(Function of the Invention) If a coil circuit configuration method such as the circuit configuration of the above embodiment is adopted, each of the heating conductors C1 and C2 of the heating coil C has a contact terminal structure T as shown in FIG. 1(b) when displaced.
I, T2 junction and 73. The heating conductor C1 is fixedly connected to the output terminal e1 of the power source E in advance, and the lead portion R2 of the heating conductor C2 is also connected to the output terminal e2 of the power source E in advance. Therefore, if the power source E is turned on in this state, the coil current will flow through the series-connected coil circuit.

(Effects of the invention) By implementing the present invention, (1) 1/2 the coil current will flow through the double-sided heating coil compared to the conventional one, so the efficiency of the power supply is improved compared to the conventional parallel configuration. It is possible to reduce the capacity of only the bone, which allows for the saving of materials. (2) Since the coil current is significantly reduced, there is less wear and tear on the contact part, and the service life of the part can be extended. (3) Furthermore, by simply replacing the contact terminal structure, it is possible to immediately respond to changes in the thickness of the heated material - the size of the spacing between the heating conductors - eliminating the need to replace the entire heating coil as in the past. (4) Moreover, it becomes easier to set the material to be heated in the apparatus at the start of the heating operation, which has remarkable effects.

[Brief explanation of the drawing]

1A and 1B are circuit diagrams of an embodiment of the coil circuit construction method of the present invention, and the second diagram is a circuit diagram showing a conventional coil circuit construction method. C------・-------1------ Double-sided heating coil c1, c2--
---Heating conductor W ------
--1 Heated material R1, R2 --- Lead part

Claims (1)

[Scope of Claims] 1) In the case of configuring a heating coil circuit for heating a material to be heated by sandwiching it between single-turn or multi-turn heating conductors from both sides thereof, one side of the material to be heated is arranged opposite to one surface of the material to be heated. One end of the side heating conductor is extended to form a lead part and connected to one side output terminal of the power supply, and the other end is fixedly arranged as a contact terminal structure and arranged opposite to the other surface of the material to be heated. The heating conductor on the other side is divided into a lead part and a winding part,
The lead part has one end connected to the output terminal on the other side of the power supply, and the other end has a contact terminal structure, and the one end of the winding part has a contact terminal structure that can be joined to the contact terminal structure of the heating conductor on the one side. , the other end has a contact terminal structure that can be joined to the contact terminal structure of the divided lead part, and is disposed so as to be displaceable at a position facing the coiled part of the heating conductor on one side and separated by a predetermined distance, and when heated, the other end By displacing the heating conductor, the contact terminal structure at one end of the heating conductor's winding section becomes the contact terminal structure at the other end of the winding section of the heating conductor on one side, and the contact terminal structure at the other end becomes the contact terminal structure at the lead section. A method for configuring a circuit for a double-sided heating coil, characterized in that the coil circuits are configured by joining each other. 2) The contact terminal structure at both ends of the winding section of the other side heating conductor consists of a member that can be attached to and detached from the end of the winding section, and the interval between the winding sections of both heating conductors can be adjusted by replacing the contact terminal structure. A circuit configuration method for a double-sided heating coil according to claim 1.