JPH0677196U - Induction heating edge heater control device - Google Patents

Abstract

(57) [Summary] [Purpose] The inductor moves according to the lateral displacement of the heated plate being conveyed, and the lap size is held constant to perform induction heating under optimum conditions. [Structure] An inductor 6 having a heating coil 5 wound around an iron core 2 is movably arranged so as to sandwich the left and right ends of the heated plate 10 running from above and below, and both ends of the heated plate 10 are induction-heated. In the induction heating edge heater 1, the impedance detector 15 provided in the energizing circuit 12 of the heating coil 5, the heating condition setting device 16 for setting the optimum heating condition of the heated plate 10, and the heating condition setting device 16 And a comparator 17 for comparing the optimum impedance output from the impedance detector 15 with the measured impedance output from the impedance detector 15, and a motor 8 for moving the inductor 6 based on the impedance difference output from the comparator 17. And a motor controller 18 that operates.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a control device for an induction heating edge heater that heats the left and right ends of a heated plate running on a rolling line.

[0002]

[Prior art]

 Generally, when rolling and rolling a heated plate continuously on a steel rolling line, the left and right ends of the heated plate, which has a large temperature drop immediately before the rolling mill, are induction-heated to make the whole uniform temperature before rolling. is doing. In this induction heating edge heater 1, for example, as shown in FIG. 2, heating coils 5 and 5 are wound around upper and lower legs 4 and 4 located at the opening of a C-shaped iron core 2 to form inductors 6 and 6, respectively. A wheel 7 attached to the bottom is configured to laterally move on a rail 9 toward the center of the rolling line by a motor 8.

The induction heating edge heaters 1 and 1 are arranged on both the left and right sides of the rolling line, and the left and right ends of the heated plate 10 are located between the inductors 6 and 6 in the opening. The heating coil 5 is energized to vertically penetrate the magnetic flux generated from the inductors 6, 6 to generate an interlinkage eddy current in the heated plate 10 for induction heating.

In this rolling line, as shown in FIG. 3, the plate to be heated 10 travels by the conveying roller 3 provided along the rolling line and reaches the induction heating edge heater 1, whereupon the inductors 6 and 6 The generated magnetic flux heats the end side of the heated plate 10. The heated plate 10 may be shifted to the left or right in the process of being conveyed by the conveying roller 3 that conveys the heated plate 10, and the dimension L that overlaps the inductor 6 changes. In the conventional induction heating edge heater 1, the position of the inductor 6 is set by determining the lap size L according to the plate width and plate thickness of the plate to be heated 10 and the heating temperature. There is a problem that the lap size L between the plate 10 and the inductor 6 changes, so that heating cannot be performed uniformly.

[0005]

[Problems to be solved by the device]

 The present invention eliminates the above-mentioned drawbacks, and an induction heating edge heater capable of performing induction heating under optimum conditions by moving the inductor according to the lateral displacement of the heated plate being conveyed and keeping the lap size constant. The control device of

[0006]

[Means for Solving the Problems]

 The present invention is an induction heating system in which an inductor having a heating coil wound around an iron core is movably arranged so as to sandwich the left and right ends of the plate to be heated from above and below, and both ends of the plate to be heated are induction-heated. In the edge heater, an impedance detector provided in the energizing circuit of the heating coil, a heating condition setting device that sets the optimum heating conditions for the plate to be heated, and the optimum impedance output from the heating condition setting device and the impedance It is characterized by comprising a comparator that compares the measured impedance output from the detector and a motor controller that controls the motor that moves the inductor based on the impedance difference output from the comparator. is there.

[0007]

[Action]

 The control device of the induction heating edge heater according to the present invention sets the impedance capable of optimally heating the plate to be heated by the heating condition setting device and outputs this signal to the comparator. The plate to be heated is conveyed by the conveying rollers along the rolling line, and both ends of the plate to be heated run between the inductors of the induction heating edge heater and are induction-heated by the magnetic flux generated there. A high-frequency current is passed through the heating coil of the inductor through an energizing circuit, and the current is detected by the current transformer for the instrument provided in this energizing circuit and the voltage is detected by the transformer for the instrument.

The current value and the voltage value detected here are output to the impedance detector, where the impedance is measured. This measured value and the optimum impedance output from the heating condition setter are compared by a comparator, and a signal is output to the motor controller based on the impedance difference to drive the motor to move the induction heating edge heater. It is adjusted to the optimum wrap size between the both ends of the heated plate and the inductor. As the heated plate is transported, it shifts to the left and right, and the dimensions for wrapping with the inductor change.

When the wrap size changes, the impedance of the heating circuit changes correspondingly. In the current-carrying circuit, the impedance detector always detects the impedance, the measured impedance is output to the comparator, and this is compared with the optimum impedance output from the heating condition setting device, and based on the impedance difference. And 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, and the lap size between the both ends of the plate to be heated and the inductor is adjusted to the optimum size so that induction heating is performed under the optimum heating conditions. Has become.

[0010]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. This induction heating edge heater 1 has inductors 6 and 6 formed by winding heating coils 5 and 5 around upper and lower legs 4 and 4 located at the opening of a C-shaped iron core 2, and a wheel 7 attached to the bottom is a motor. The rail 8 laterally moves on the rail 9 toward the center of the rolling line.

The energizing circuit 12 of the heating coil 5 is provided with an instrument current transformer 13 and an instrument transformer 14, and the current and voltage detected here are output to the impedance detector 15, where the impedance is detected. Is being measured. Reference numeral 16 is a heating condition setting device, which sets the impedance for optimum heating from the width, thickness and heating temperature of the heated plate 10. Reference numeral 18 is a comparator connected to the impedance detector 15 and the heating condition setter 17, which compares the optimum impedance output from the heating condition setter 16 with the measured impedance output from the impedance detector 15. It has become.

Reference numeral 18 is a motor controller connected to the comparator 17, and 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. It is like this. A pulse generator 19 detects 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.

The induction heating edge heater 1 having the above-mentioned configuration sets the impedance that can be optimally heated from the plate width, plate thickness and heating temperature of the plate to be heated 10 by the heating condition setting device 16 and outputs this signal to the comparator 17. To do. On the other hand, the plate to be heated 10 is conveyed along the rolling line by the conveying rollers 3 and 3, and both ends of the plate to be heated 10 travel between the inductors 6 of the induction heating edge heater 1 and are induced by the magnetic flux generated there. Be heated. A high-frequency current is supplied from the high-frequency power supply 11 to the heating coil 5 of the inductor 6 through the energizing circuit 12, and the current transformer 13 provided in the energizing circuit 12 detects the current and the voltage transformer 14 supplies the voltage. To detect.

The current value and the voltage value detected here 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 by the comparator 17, and a signal is output to the motor controller 18 based on the impedance difference, and the motor 8 is driven to perform induction heating. The edge heater 1 is moved to adjust the optimum lap size L between the both ends of the heated plate 10 and the inductor 6.

During the process in which the plate 10 to be heated is conveyed, the dimension L to be overlapped with the inductor 6 is changed by shifting left and right. When the lap size L changes, the impedance of the heating circuit changes accordingly. The energizing circuit 12 is provided with an instrument current transformer 13 and an instrument transformer 14, and the impedance detector 15 constantly detects the impedance based on the detected values. The impedance increases as the lap size L increases, and conversely the impedance decreases as the lap size L decreases. This measured impedance is output to the comparator 17, which is compared with the optimum impedance output from the heating condition setting device 16, and a signal is output to the motor controller 18 based on the impedance difference. To be done.

As a result, the motor 8 rotates in the forward and reverse directions to move the induction heating edge heater 1 so that the lap size L between the both ends of the heated plate 10 and the inductor 6 is adjusted to the optimum size. Induction heated. The moving position of the induction heating edge heater 1 is measured by the pulse generator 19, and this position signal is fed back to the motor controller 18.

[0017]

[Effect of device]

 As described above, according to the controller for the induction heating edge heater according to the present invention, the inductor is moved according to the lateral displacement of the heated plate being conveyed, and the lap size is kept constant to maintain the optimum condition. It can be induction heated.

[Brief description of drawings]

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

FIG. 2 is a configuration diagram showing a control device for a conventional induction heating edge heater.

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

[Explanation of sign]

 1 Induction heating edge heater 2 C-shaped iron core 3 Conveying roller 4 Leg part 5 Heating coil 6 Inductor 10 Heated plate 11 High frequency power supply 12 Energizing circuit 13 Current transformer for instrument 14 Transformer for instrument 15 Impedance detector 16 Heating condition setter 17 Comparator 18 Motor controller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Dogami 1-1-1, Shibaura, Minato-ku, Tokyo Inside Toshiba Headquarters Co., Ltd. (72) Kenji Takaoka, No. 1 Kokancho, Fukuyama City, Hiroshima Japan Steel Pipe Co., Ltd. Fukuyama Works

Claims (1)

[Scope of utility model registration request] 1. An induction heating system in which an inductor having a heating coil wound around an iron core is movably arranged so as to sandwich the left and right end sides of a traveling heated plate from above and below, and both end sides of the heated plate are induction-heated. In the edge heater, an impedance detector provided in the energizing circuit of the heating coil, a heating condition setting device for setting the optimum heating condition of the plate to be heated, and an optimum impedance output from the heating condition setting device and the impedance detection Heating edge characterized by comprising a comparator for comparing with a measured impedance output from the device, and a motor controller for controlling a motor for moving the inductor based on the impedance difference output from the comparator. Control device for heater.