JP3230324B2 - Switching device for multiple induction heating coils in an induction heating furnace for billets - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a billet having a structure in which a plurality of induction heating coils are housed in respective furnace bodies, and these furnace bodies are stacked up and down to move up and down to switch the induction heating coils. The present invention relates to a switching device for a plurality of induction heating coils in an induction heating furnace.

[0002]

2. Description of the Related Art The basic structure of a billet induction heating furnace having a plurality of induction heating coils (hereinafter, simply referred to as "coils") is that a plurality of coils are housed in each furnace body,
By stacking these furnace bodies up and down and moving them up and down integrally by a lifting device, the furnace body containing the target coil is placed at the working position, thereby switching the coils and changing the thickness etc. The heating of a plurality of types of billets is enabled by a single billet induction heating furnace.

In a conventional induction heating furnace provided with a plurality of coils, one end of a separate water-cooled cable is fixedly connected to each terminal of the coil protruding from the side surface of each furnace body by a bolt, so that each When the furnace body was moved up and down as a unit, each water-cooled cable was moved up and down accordingly. For this reason, there have been disadvantages such as damage of the water-cooled cable due to elevating and lowering, occurrence of water leakage at the connection portion, and the necessity of providing an extra length for the water-cooled cable corresponding to elevating and lowering. In addition, the other end of each water-cooled cable connected to the terminal of each coil is connected to a power supply via a power supply connector, and the power supply connector is operated to select a coil to be used and energize. Furthermore, the switching of the energization length of each coil has been performed by operating a rotary tap changer or the like. As described above, there is a problem that various devices are necessary to energize each coil and to switch the energization length.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to simplify a coil switching operation in a billet induction heating furnace having a plurality of coils by sharing a water-cooling cable connected to each coil terminal. Was made as an issue.

[0005]

In order to solve this problem, a means adopted in the present invention is a method in which a plurality of furnace bodies each containing a different type of coil are stacked vertically,
By raising and lowering the plurality of furnace bodies integrally by a lifting device, in a billet induction heating furnace configured to switch coils, a plurality of terminals of the coils are projected at the same position on the side surface of each furnace body, A plurality of terminal clampers for releasably clamping the respective terminals are arranged on the side of the furnace main body arranged at the working position, and the other end of each water-cooled cable having one end connected to a power source is respectively provided. That is, it is connected to the terminal clamper.

[0006]

In order to switch the coils, after releasing each terminal clamper, the furnace body in which each coil is mounted is moved up and down by the elevating device, and the target coil is relocated to the working position. Each terminal protruding from the side surface of the furnace body is located at each terminal clamper. Thereafter, of the terminal clampers, only the terminal clampers corresponding to the terminals that need to be energized are operated to clamp the respective terminals. As a result, the terminals of different coils are clamped by the same terminal clamper, and each coil can be energized by using a common water-cooled cable. In addition, in the case where only the energization length of the coil, the uniform heating of the billet, and the taper heating are performed without switching the coil, it is only necessary to operate each terminal clamper and re-clamp the terminal.

[0007]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. FIG. 1 is a front view of an induction heating furnace for a billet provided with a coil switching device according to the present invention, FIG. 2 is a front view of a different state, and FIG. 3 is a front view of each terminal clamper A ₁ -A. ₆ and each terminal Ta _{1 to} T of the coil Ca (Cb)
is a plan view showing the arrangement relationship only with _{a 6 (Tb 1 ~Tb 6)} . 1 to 3, an opening 2 corresponding to the size of each of the furnace bodies Fa and Fb stacked one above the other is provided on the upper surface of the gantry 1. Each furnace body Fa, Fb
Are stacked one above the other as described above and are integrated, and are mounted on an upper surface of a base 3 provided inside the gantry 1 via an elevating device 4 such as a hydraulic lifter. Each of the furnace bodies Fa and Fb is provided with coils Ca and Cb having different sizes. Each coil Ca, C
b is divided into five parts along the moving direction of the billet B, and each terminal Ta ₁ connected to both ends of the coil Ca and each dividing boundary part is provided on both side surfaces of the furnace body Fa disposed above. to Ta ₆ is projected by three respectively. In this way, on both sides of the furnace body Fa, but the terminals Ta ₁ to Ta ₆ coils Ca protrudes by three, at each side, each terminal Ta centrally located _2, the Ta ₄ The protruding length is longer than that of the other terminals, and the protruding position of each of the terminals Ta ₂ and Ta ₄ is higher than the other terminals. This is to avoid interference between the terminal clampers A _{1 to} A ₆ for clamping the terminals Ta _{1 to} Ta ₆ of the coil Ca, and from the viewpoint of coil switching,
There is no particular meaning.

Further, three terminals Tb _{1 to} Tb ₆ of each of the divided coils Cb also protrude from both sides of the furnace body Fb disposed below, in exactly the same manner as the furnace body Fa. . And the terminals Ta ₁ to Ta ₆ above the coil Ca, position in a plan view and a side view of the terminals Tb ₁ ~Tb ₆ below the coil Cb together with the same, is also consistent its end position .

In each of the states shown in FIGS. 1 and 2, the coils Ca and Cb are respectively located at the working positions.
The portion where the tip portion is positioned in the terminals Ta ₁ to Ta is arranged in the working position of the upper surface of the mount _{1 6 (Tb 1 ~Tb 6)} , each respective said terminals Ta ₁ ~Ta ₆ (Tb ₁ ~Tb terminal clamper a ₁ to a ₆ for clamping the leading end portion from the horizontal direction of ₆₎ is arranged. Each terminal clamper A ₁
A ₆ is attached via brackets 5 on both sides of the opening 2 on the upper surface of the gantry 1. Each terminal clamper A
_{1 to 6} are all the same, and as shown in an enlarged plan view in FIGS. 4 to 6, a fixing portion 11 fixed to the bracket 5; A pneumatic cylinder 13 is attached to the movable part 12, and a rod 13 a of the pneumatic cylinder 13 is provided at a central part of the fixed part 11.
a, a head 14 is fixed to the tip of the rod 13a. At one end of the movable portion 12 and facing portion 12a is provided facing the head 14, on the inner side of the opposing portion 12a, the terminal E ₁ was fixed to one end of the water cooling cable D ₁ to D ₆ to E ₆ is attached and this terminal E
Another head 15 is fixed inside _{1 to} E ₆ so as to face the head 14. Water-cooled cable D ₁
To D _6, to protrude from the inside of the gantry 1 in its upper, short terminal Ta _{1 lengths, Ta 3, Ta 4, Ta} 6 (Tb 1, Tb 3, Tb 4, Tb 6)
Water cooled cables _{D 1, D 3, D 4} , D 6 corresponding to protrude thereabove through the opening 2 of the gantry 1, the long terminal Ta _{2 lengths, Ta 5 (Tb 2, Tb} 5) Protrudes above the gantry 1 through a cable-dedicated insertion port 6 provided on the upper surface of the gantry 1. The other end of the water cooling cable D ₁ to D ₆ is connected to a power source.

[0010] The coil Ca (C
distal ends of the terminals _{Ta 1 ~Ta 6 (Tb 1 ~Tb} 6) of b) is made the to be placed between each head 14, 15 of each pin clampers A ₁ to A _6. FIG. 4 shows a state in which the rod 13a of the pneumatic cylinder 13 is most retracted,
Distal ends of the terminals _{Ta 1 ~Ta 6 (Tb 1 ~Tb} 6) of the coil Ca (Cb) between each head 14, 15 is arranged.
In this state, when the rod 13a of the pneumatic cylinder 13 is protruded, the movable part 12 does not move with respect to the fixed part 11, so that the head 14 at the tip of the rod 13a
Striking the one surface of the terminal _{Ta 1 ~Ta 6 (Tb 1 ~Tb} 6) of (Cb) (see FIG. 5). Then, when the further project the rod 13a, the movable portion 12 is moved relative to the fixed portion 11, another head 15 attached to the opposing portion 12a of the movable portion 12 is the terminal Ta ₁ to Ta ₆ ( Tb _{1 to} Tb ₆ ), the two surfaces of the terminals E _{1 to} E ₆ are brought into contact with each other by the protruding force of the rod 13 a of the pneumatic cylinder 13.
4 and 15 (see FIG. 6), the coil Ca
And each terminal _{(Cb) Ta 1 ~Ta 6 (} Tb 1 ~Tb 6), each water-cooled cables D ₁ to D ₆ are connected via the terminal clamper A ₁ to A _6. The operation of the pneumatic cylinders 13 of the respective terminals clampers A ₁ to A ₆ is performed by the remote.

As shown in FIG. 1, for example, in the case where the coil Ca is used, when the coil Cb is switched to the lower coil Cb by changing the billet B which is the object to be heated, the following is performed. . First, retract the rod 13a of the pneumatic cylinder 13, to release what is clamped by the terminal clamper A ₁ to A ₆ of the respective terminals Ta ₁ to Ta ₆ coils Ca. Thereafter, the furnace bodies Fa and Fb integrated vertically by the lifting device 4.
Is raised, and as shown in FIG.
b is placed in the working position, the terminals Tb _{1 of the} coil Cb
To Tb ₆ are terminal clampers A _{1 to} A
₆ are inserted between the respective heads 14 and 15. Then, of the terminal clampers A _{1 to} A ₆ , terminals T which need to be energized correspond to the energization length of the billet B to be heated.
Only terminals clamper corresponding to b ₁ ~Tb ₆ is operated as described above, to clamp only terminal Tb ₁ ~Tb ₆ that requires energization. Thereby, each terminal Tb _{1 to} Tb of the coil Cb is
b ₆ , the terminals that need to be energized and the water cooling cables D _{1 to} D ₆ connected to the power supply are connected to the terminal clampers A _{1 to} A 6.
Connected via ₆ .

In addition, the coil Ca (Cb) is not switched, but the energization length is switched, the billet is heated uniformly,
When only taper heating is performed, each terminal clamper A ₁
To A ₆ by operating the, by now releases the clamp terminals are clamped, the other terminal well only re-clamp operation of the terminals clampers A ₁ to A ₆ only,
The switching of the conduction length can be performed very easily.

Although the above embodiment is an example in which the present invention is applied to a billet induction heating furnace having two types of coils, the present invention can also be applied to a heating furnace having three types of coils. . Further, the terminal clamper described above is merely an example, and any terminal clamper may be used as long as the terminal is configured to be releasably clamped from the left and right directions.

[0014]

The present invention has a plurality of coils,
In a billet induction heating furnace configured to switch the coils by raising and lowering each furnace main body containing each coil, a plurality of terminals of the coils are projected at the same position on the side surface of each furnace main body to perform the work. A plurality of terminal clampers for releasably clamping the respective terminals are disposed on the side of the furnace body disposed at the position, and the other end of each water-cooled cable having one end connected to a power source is provided. The configuration connected to the terminal clamper provides the following effects. (1) Only the coil moves up and down, and the water-cooled cable connected to this coil is fixed and does not move up and down, so that the water-cooled cable is not damaged when the coil is switched and the water-cooled cable has extra length to allow for the up-and-down movement There is no need to provide (2) Compared to the conventional heating furnace, where the use of a rotary tap changer was indispensable, because when switching the energized length while keeping the coil as it was, only the operation of each terminal clamper was necessary. Then, the operation becomes extremely simple. (3) Since the other end of each water-cooled cable whose one end is connected to each terminal clamper may be directly connected to a power source, a connector is connected to the power connection of the water-cooled cable as in a conventional heating furnace. There is no need to use it.

[Brief description of the drawings]

FIG. 1 is a front view of a billet induction heating furnace provided with a coil switching device according to the present invention.

FIG. 2 is a front view of a different state.

FIG. 3 shows terminal clampers A _{1 to} A ₆ and coils Ca (C
b) it is a plan view showing the arrangement relationship only between the terminals _{Ta 1 ~Ta 6 (Tb 1 ~Tb} 6) of.

FIG. 4 is a plan view when the terminal clampers A _{1 to} A ₆ are not clamped.

FIG. 5 is a plan view of the terminal clampers A _{1 to} A ₆ during clamping.

FIG. 6 is a plan view of the terminal clampers A _{1 to} A _{6 at} the time of clamping.

[Explanation of symbols]

A ₁ to A _6: terminal clamper Ca, Cb: the induction heating coils D ₁ to D _6: water-cooled cables E ₁ to E _6: water-cooled cable terminal Fa, Fb: the furnace body _{Ta 1 ~Ta 6, Tb 1 ~Tb} 6 : Terminal of induction heating coil 4: Lifting device

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-259386 (JP, A) JP-B-54-42458 (JP, B2) Patent 2998445 (JP, B2) (58) Fields investigated (Int. (Cl. ⁷ , DB name) C21D 1/10 C21D 1/42 F27D 11/06 H05B 6/00-6/10 381 H05B 6/14-6/44

Claims (1)

(57) [Claims] 1. A plurality of furnace bodies each containing a different type of induction heating coil are stacked vertically, and the plurality of furnace bodies are integrally moved up and down by an elevating device to switch the induction heating coils. In the billet induction heating furnace having the configuration, a plurality of terminals of the induction heating coil are protruded at the same position on the side surface of each of the furnace bodies so that the terminals can be released to the side of the furnace body arranged at the working position. A plurality of terminal clampers for clamping are provided, and the other end of each water-cooled cable having one end connected to a power source is connected to the terminal clamper, respectively. Switching device for heating coil.