JP2588606Y2 - Control device for induction heating edge heater - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an induction heating edge heater for heating both left and right ends of a plate to be heated running on a rolling line.

[0002]

2. Description of the Related Art Generally, when a heated plate is continuously run on a steel rolling line to perform rolling, the right and left ends of the heated plate having a large temperature drop are heated immediately before the rolling mill by uniform heating. After rolling to temperature. This induction heating edge heater 1 is, for example, as shown in FIG.
Heating coils 5, 5
Are wound respectively to form inductors 6, 6, and a wheel 7 attached to the bottom portion is laterally moved on a rail 9 by a motor 8 toward the center of the rolling line.

The induction heating edge heaters 1 and 1 are disposed on the left and right sides of the rolling line, and the left and right ends of the plate 10 to be heated are positioned between the inductors 6 and 6 in the opening. When the coil 5 is energized, the magnetic flux generated from the inductors 6 and 6 penetrates up and down, and the plate to be heated 10 generates an interlinking current to perform induction heating.

In this rolling line, as shown in FIG. 3, a plate 10 to be heated is provided on a conveying roller 3 provided along the rolling line.
, And when it reaches the induction heating edge heater 1,
Here, the end portions of the heated plate 10 are heated by the magnetic flux generated from the inductors 6 and 6. In the process of being conveyed by the conveying roller 3 for conveying the plate 10 to be heated, the plate may be shifted left and right, and the dimension L overlapping the inductor 6 changes. In the conventional induction heating edge heater 1, the position of the inductor 6 is set by determining the wrap size L according to the width and thickness of the heated plate 10 and the heating temperature. There is a problem that uniform heating is not possible due to a change in the wrap dimension L between the inductor and the inductor 6.

[0005]

SUMMARY OF THE INVENTION The present invention eliminates the above-mentioned disadvantages, and moves the inductor in accordance with the left and right displacement of the conveyed plate to be heated, thereby keeping the wrap size constant, and performing induction heating under optimum conditions. And a controller for the induction heating edge heater.

[0006]

According to the present invention, an inductor having a heating coil wound around an iron core is movably disposed so as to sandwich the left and right ends of a traveling heated plate from above and below. In the induction heating edge heater for induction heating at both ends, an impedance detector provided in the energizing circuit of the heating coil, and the optimum heating conditions are set based on the width, thickness, and heating temperature of the plate to be heated. A heating condition setting device to output, and a comparator that compares the optimum impedance output from the heating condition setting device with the measurement impedance output from the impedance detector,
A motor controller for controlling a motor that moves the inductor based on the impedance difference output from the comparator.

[0007]

According to the control device of the induction heating edge heater of the present invention, an impedance capable of optimally heating the heated plate is set by the heating condition setting device based on the width, thickness and heating temperature of the heated plate, and this signal is compared. Output to the container. The plate to be heated is conveyed by a conveying roller on a rolling line, and both ends of the plate to be heated run between inductors of an induction heating edge heater, and are induction-heated by a magnetic flux generated therefrom. A high-frequency current flows through the heating coil of the inductor through a current-carrying circuit.
The current is detected by an instrument current transformer provided in the current supply circuit, and the voltage is detected by an instrument transformer.

The current value and the voltage value detected here are output to an impedance detector, where the impedance is measured. The measured value and the optimum impedance output from the heating condition setting device are compared by a comparator, and a signal is output to the motor controller based on the impedance difference, the motor is driven to move the induction heating edge heater, and It is adjusted to the optimum wrap size between both ends of the heating plate and the inductor. In the process in which the plate to be heated is conveyed, the size of the plate to be shifted left and right and wrapped with the inductor changes.

When the wrap size changes, the impedance of the heating circuit changes accordingly. In the current-carrying circuit, the impedance is always detected by the impedance detector, and the measured impedance is output to the comparator. This is compared with the optimum impedance output from the heating condition setting device by the comparator, and based on the impedance difference, A signal is output to the motor controller. As a result, the motor rotates in the forward and reverse directions to move the induction heating edge heater, so that the lap dimension between the both ends of the plate to be heated and the inductor is adjusted to the optimal dimension, and the induction heating is performed under the optimal heating condition. ing.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIG. In this induction heating edge heater 1, inductors 6 and 6 are formed by winding heating coils 5 and 5 around upper and lower legs 4 and 4 located at openings of a C-shaped iron core 2, and a wheel 7 attached to the bottom is a motor. 8, the rail 9 moves laterally on the rail 9 toward the center of the rolling line.

The current supply circuit 12 of the heating coil 5 is provided with a current transformer 13 for the instrument and a transformer 14 for the instrument, and the detected current and voltage are output to the impedance detector 15,
Here, the impedance is measured.
Reference numeral 16 denotes a heating condition setting device which sets an impedance capable of optimal heating based on the plate width, plate thickness, and heating temperature of the plate 10 to be heated. Reference numeral 18 denotes a comparator connected to the impedance detector 15 and the heating condition setting device 17, and the heating condition setting device 16
Is compared with the measured impedance output from the impedance detector 15.

Reference numeral 18 denotes a motor controller connected to the comparator 17, which controls the motor 8 for moving the inductor 6 based on the impedance difference output from the comparator 17 to adjust the position of the inductor 6. Has become. Reference numeral 19 denotes a pulse generator for detecting the position of the induction heating edge heater 1 connected to the motor 8, and this position detection signal is output to the comparator 17.

[0013] The induction heating edge heater 1 having the above-described structure includes:
The impedance that can be optimally heated is set by the heating condition setting unit 16 based on the plate width, the plate thickness, and the heating temperature of the plate 10 to be heated, and this signal is output to the comparator 17. On the other hand, the heated plate 10 is conveyed on the rolling line by the conveying rollers 3 and 3, and both ends of the heated plate 10 travel between the inductors 6 and 6 of the induction heating edge heater 1 and are guided by the magnetic flux generated therefrom. Heated. A high-frequency current is applied to the heating coil 5 of the inductor 6 from a high-frequency power supply 11 through an energizing circuit 12. The current is detected by an instrument current transformer 13 provided in the energizing circuit 12, and a voltage is applied by an instrument transformer 14. To detect.

The detected current value and voltage value are output to the impedance detector 15, where the impedance is measured. The measured impedance and the optimum impedance output from the heating condition setting device 16 are compared with the comparator.
A comparison is made at 17 and a signal is output to the motor controller 18 based on the impedance difference, and the motor 8 is driven to move the induction heating edge heater 1 so that the optimum wrap between the both ends of the plate 10 to be heated and the inductor 6 is obtained. It is adjusted to the dimension L.

In the process in which the plate to be heated 10 is conveyed, the dimension L overlapping the inductor 6 is shifted to the left and right. When the wrap dimension L changes, the impedance of the heating circuit changes accordingly. The current-carrying circuit 12 is provided with an instrument current transformer 13 and an instrument transformer 14, and the impedance is constantly detected by the impedance detector 15 based on the detected value. As the wrap size L increases, the impedance increases. Conversely, as the wrap size L decreases, the impedance decreases. The measured impedance is output to the comparator 17, and this is compared with the optimum impedance output from the heating condition setting unit 16, and a signal is output based on the impedance difference to the motor controller 18.
Is output to

As a result, the motor 8 rotates forward and backward to move the induction heating edge heater 1, and the wrap dimension L between both ends of the plate 10 to be heated and the inductor 6 is adjusted to an optimum dimension.
Induction heating is performed under optimal heating conditions. The moving position of the induction heating edge heater 1 is measured by the pulse generator 19,
This position signal is fed back to the motor controller 18.

[0017]

As described above, according to the control apparatus of the induction heating edge heater according to the present invention, the inductor is moved in accordance with the left and right displacement of the conveyed plate to be heated, and the wrap size is kept constant. Thus, induction heating can be performed under optimum conditions according to the width, thickness, and heating temperature of the plate to be heated.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a control device of an induction heating edge heater according to an embodiment of the present invention.

FIG. 2 is a configuration diagram illustrating a control device of a conventional induction heating edge heater.

FIG. 3 is a side view showing the induction heating edge heater of FIG. 2;

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Induction heating edge heater 2 C-shaped iron core 3 Conveying roller 4 Leg 5 Heating coil 6 Inductor 10 Plate to be heated 11 High frequency power supply 12 Current circuit 13 Current transformer for instrument 14 Transformer for instrument 15 Impedance detector 16 Heating condition setting unit 17 Comparator 18 Motor controller

──────────────────────────────────────────────────続 き Continuing on the front page (72) Koji Dogami 1-1-1, Shibaura, Minato-ku, Tokyo Inside the head office of Toshiba Corporation (72) Kenji Takaoka 1 Kobe-cho, Fukuyama-shi, Hiroshima Nippon Steel Pipe Co., Ltd. (56) References JP-A-59-134588 (JP, A) JP-A-54-116845 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H05B 6 / 10 381

Claims (1)

(57) [Scope of request for utility model registration] 1. An induction heating device for arranging an inductor having a heating coil wound around an iron core so as to movably sandwich both left and right ends of a traveling heated plate from above and below, and induction heating both ends of the heated plate. In the edge heater, an impedance detector provided in an energizing circuit of the heating coil, and a width, a thickness, and an optimal heating condition of the heated plate are set based on a heating temperature.
A heating condition setting device that outputs an optimum impedance, a comparator that compares the optimum impedance output from the heating condition setting device with the measurement impedance output from the impedance detector, and an impedance difference output from the comparator. And a motor controller for controlling a motor for moving the inductor based on the control of the induction heating edge heater.