KR101006608B1 - Induction heating apparatus - Google Patents

Abstract

The induction heating apparatus 1 winds a heating coil around the iron core legs 4a and 4b above and below the opening portion 3 of the iron core 2 having a C-shape, thereby closing the inductor gap H, which is an interval between the openings 3. The inductor 6 which can be adjusted, the electric power amount detection means 15 which detects the electric power value of the measured heating coil as a measured electric power value, and the heating condition setting means which sets the electric power target value based on the optimal heating condition of a heating coil ( 11), an inductor gap value converting means 16 for converting a target amount of electric power into an optimum inductor gap value, and converting a measured power amount into a measured inductor gap value, and a gap deviation calculating means 17 for calculating a gap deviation; Air gap motor control means 19 for controlling the air gap motor 19 to adjust the inductor gap based on the gap deviation.

Induction heating device, inductor, air gap motor, iron core, heating coil

Description

Induction Heating Equipment {INDUCTION HEATING APPARATUS}

This invention relates to the induction heating apparatus which heats the left and right both ends of the to-be-heated material conveyed in a hot rolling installation.

Generally, in a hot rolling facility, a to-be-heated material is heated to predetermined temperature previously, is conveyed continuously, it passes through several rolling mills, and it rolls sequentially, and shape | molds a thin plate. This heated material suffers from the problem that its both ends are gradually radiated during the conveyance process, and the temperature of this portion is gradually lowered compared to the central portion. If the end side drops in temperature and the whole temperature is rolled in a non-uniform state, the quality of the rolled steel sheet is not constant, and the hardness of the side end portion is increased, resulting in cracking of the material to be heated or uneven wear of the roller of the rolling mill. For this reason, generally, the induction heating apparatus which installs the both ends of a to-be-heated material locally by an inductor in the upstream of the rolling mill of a hot rolling facility, makes the whole to a substantially constant temperature, and rolls.

For example, in the induction heating apparatus 100 shown in FIG. 8, the iron core 2R is formed in the C shape, and the upper iron core leg which opposes up and down across the opening part 3 of this C type iron core 2R is interposed. An inductor 6R having a heating coil wound around the portion 4Ra and the lower iron core leg portion 4Rb, respectively, to form the upper inductor portion 5Ra and the lower inductor portion 5Rb. In addition, an inductor 6L having the same configuration as the inductor 6R is disposed to face each other, and as shown in FIG. Is placed on.

In the case of locally heating both end portions of the material to be heated 7 with the induction heating device 1, the end side of the material to be heated 7 is passed through the openings 3 of the inductors 6R and 6L. The high-frequency current is energized by the heating coil from the upper inductor portions 5Ra and 5La and the lower inductor portions 5Rb and 5Lb to generate magnetic flux in the vertical direction. By intersecting the magnetic flux perpendicularly to the heating member 7, the eddy current is induced in the heating member 7, and Joule is generated by the eddy current to locally generate both ends of the heating member 7. It is heating.

However, this heated material 7 is shifted left and right in the process of being conveyed by the conveyance roller 9, and as shown in FIG. 8, the heated material 7 and the inductors 6R, 6L wrap. The dimension L to be lap may change.

The wrap dimension L is set according to the plate width, plate thickness and heating temperature of the material to be heated 7, but the wrap size L of the heated material 7 and the inductors 6R and 6L to be conveyed. When was changed, there was a problem that the material to be heated 7 could not be uniformly heated.

Thus, for example, Patent Document 1 (Utility Model Registration No. 2588606) discloses an optimum condition for a heated material by keeping the wrap dimension L constant by moving the inductor in accordance with the left and right shift of the heated material to be conveyed. A control device for an induction heating edge heater capable of induction heating in a heat sink has been proposed.

Although the induction heating edge heater control device described in Utility Model Registration No. 2588606 can induction heating the material to be heated to an optimum condition, the total weight of this induction heating edge heater is about 20 tons, so that the induction heating edge heater There has been a case where the moving device for moving the device is enlarged and the response speed is not sufficient.

This invention is made | formed in view of the said subject, Comprising: It is a compact installation and provides the induction heating apparatus excellent in the responsiveness which can be inductively heated at optimum conditions according to the left-right deviation of the to-be-heated material to be conveyed.

1 is a configuration diagram showing an embodiment of the induction heating apparatus according to the present invention.

2 is a configuration diagram of an induction heating apparatus according to the present embodiment in which two inductors are provided.

3 is a perspective view of the induction heating apparatus according to the present embodiment.

4 is an explanatory diagram illustrating induction heating of the induction heating apparatus according to the present embodiment.

5 is a diagram illustrating a relationship between an inductor gap value and a power amount.

FIG. 6 is a diagram illustrating a configuration of an induction heating apparatus as a first modification. FIG.

7 is a diagram illustrating a relationship between an inductor position and an amount of power indicating a distance between an inductor and a heated material.

8 is a cross-sectional view showing a conventional induction heating apparatus.

9 is a plan view showing a conventional induction heating apparatus.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment which concerns on this invention is described with reference to drawings.

"Configuration"

1 is a configuration diagram showing an embodiment of the induction heating apparatus according to the present invention.

The induction heating apparatus 1 according to the present embodiment includes an inductor 6R for inductively heating the left and right both ends of the heated material 7 so that the left and right both ends of the heated material 7 are disposed from above and below, and the inductor. High-frequency power supply 10 for supplying power to 6R, heating condition setter 11 for setting a target value of electric power from heating condition of inductor 6R, and instrument for detecting supply current to inductor 6R Current transformer 13R, instrument transformer 14R for detecting the supply voltage to inductor 6, power detector 15R for calculating the amount of power as the measured power amount from the detected current value and voltage value, and heating condition setter An inductor gap value converter 16R for converting the target amount of power output by (11) into an optimum inductor gap value and converting the measured power amount output by the power detector 15R into a measured inductor gap value; Pore Values and Measuring Inductors A gap deviation calculator 17R for calculating the deviation of the pole value as the gap deviation, a gap motor controller 18R for controlling the gap motor 19R so as to eliminate the gap deviation, and an inductor 6R with the gap motor 19R. It has a jack 20R for operating.

In addition, although one inductor 6R is shown in FIG. 1, the induction heating apparatus 1 which concerns on this embodiment is a short direction (width direction) of the to-be-heated material 7 as shown in FIG. 1 inductor 6L is further arrange | positioned so that the left and right both ends of a side may be interposed.

That is, the inductor 6R forms an iron core 2R composed of the upper iron core portion 2Ra and the lower iron core portion 2Rb in the form of C, and the upper and lower sides of the inductor 6R with the opening 3 of the C core 2R in between. An upper inductor portion 5Ra and a lower inductor portion 5Rb wound around the heating coil are provided on the upper iron core leg 4Ra and the lower iron core leg 4Rb facing each other. In addition, an inductor 6L having the same configuration as the inductor 6R is disposed to face each other, and as shown in FIG. 3, an opening 3 fitted to the upper core core 4Ra and the lower core 4Rb. ) Is passed through the end side of the heated material 7 conveyed by the conveying roller 9.

As a result, the inductor 6R causes current to flow from the power supply 10 to the upper inductor portion 5Ra and the lower inductor portion 5Rb as shown in FIG. 4 to generate magnetic flux? In the vertical direction. And the magnetic flux (phi) is bridged to the to-be-heated material 7, an eddy current is induced, a joule heat is generated, and the to-be-heated material 7 is heated.

In addition, as shown in FIG. 2, the inductor 6R has an upper core portion 2Ra rotated about the hinge portion 2Rc with respect to the lower iron core portion 2Rb of the C-type iron core 2R. The inductor gap H, which is the distance between the inductor portion 5Ra and the lower inductor portion 5Rb, can be adjusted. The same configuration is also applied to the inductor 6L.

Thereby, even when the left-right shift | offset | difference of the to-be-heated material 7 to be conveyed generate | occur | produces, by adjusting the inductor space | gap H corresponding to the shift | offset | difference generated, the Joule heat which generate | occur | produces in the to-be-heated material 7 can be made uniform. have.

"Action"

Next, the effect | action of the induction heating apparatus 1 which concerns on this embodiment is demonstrated with reference to FIG. In addition, since the inductor 6R and the inductor 6L have the same configuration, only the inductor 6R will be described below, and the description of the inductor 6L is omitted.

First, the heating condition setter 11 receives the set value of the amount of power that can be optimally heated from at least the material, the plate width, and the plate thickness of the material to be heated 7 by external input or the like, and sets the set value of the received amount of power. It is set as an electric power target value and output to the inductor gap value converter 16R.

On the other hand, as for the to-be-heated material 7 conveyed by the conveyance roller 9, both ends side run between the upper inductor part 5Ra and the lower inductor part 5Rb of the induction heating apparatus 1, and generate | occur | produce here Induction heating is performed by the magnetic flux.

The high-frequency current is energized from the high-frequency power supply 10 through the energizing circuit 12R to the upper inductor 5Ra and the lower inductor 5Rb of the inductor 6R, and the instrument current transformer installed in the energizing circuit 12R. Supply current is detected by 13R, and supply voltage is detected by instrument transformer 14R.

The current value detected by the instrument current transformer 13R and the voltage value detected by the instrument transformer 14R are transmitted to the power detector 15R, and the current value and the voltage value received by the power detector 15R. The amount of power is calculated as the amount of power measured from.

Then, the inductor gap value converter 16R converts the target amount of electric power set by the heating condition setter 11 into the optimum inductor gap value.

In addition, the inductor pore value converter 16R receives the measurement power amount detected by the power detector 15R, and converts the received measurement power amount into the measurement inductor pore value.

FIG. 5 is a diagram showing the relationship between the inductor gap value and the power amount in the inductor 6R. Reference numeral 501 denotes a power amount W with respect to the inductor gap value H.

As shown in FIG. 5, as the power amount W increases the inductor gap value H, the impedance of the inductor 6R decreases and the power amount W decreases.

Thus, the inductor gap value converter 16R calculates the optimum inductor gap value and the measured inductor gap value by converting the amount of power W into the inductor gap H using the relationship of FIG. 5.

Next, the gap deviation calculator 17R calculates the deviation between the optimum inductor gap value and the measured inductor gap value converted by the inductor gap value converter 16R as the gap deviation, and outputs it to the gap motor controller 18R.

And the pore motor controller 18R controls the pore motor 19R to eliminate the deviation between the optimum inductor pore value and the measured inductor pore value, that is, the pore deviation received from the pore deviation calculator 17R to be zero. Is calculated and the calculated control amount is transmitted to the air gap motor 19R.

The air gap motor 19R operates on the basis of the received control amount to operate the jack 20R.

By the operation of this jack 20R, the upper iron core portion 2Ra of the inductor 6R rotates about the hinge portion 2Rc with respect to the lower iron core portion 2Rb.

As a result, the inductor gap H, which is the distance between the upper inductor portion 5Ra and the lower inductor portion 5Rb, can be adjusted, and the response to the left and right shift of the heated material 7 which is conveyed while being a compact facility is responded. Induction heating can be performed at this favorable optimum condition.

<First Modification>

The induction heating apparatus 1 according to the present embodiment adjusts the inductor gap H, which is the distance between the upper inductor portion 5Ra and the lower inductor portion 5Rb, in accordance with the amount of power of the inductor 6R.

The induction heating apparatus 1a, which is the first modified example, adjusts the inductor gap H in accordance with the amount of power of the inductor 6R, and laterally moves the trolley on which the inductor 6R is fixed in the short direction of the heating material 7. By doing so, the distance between the material to be heated 7 and the inductor 6R is adjusted.

In this way, the inductor 6R is moved to a position at which the set optimum condition is set, and the inductor gap H is adjusted to induce the finely controlled heating temperature against the left and right deviation of the heated material 7 to be conveyed. Can be heated.

"Configuration"

FIG. 6 is a diagram showing the configuration of an induction heating apparatus 1a as a first modification.

In addition to the structure of the induction heating apparatus 1 which concerns on this embodiment, the induction heating apparatus 1a which is a 1st modified example further has the to-be-heated material 7 and the inductor in the short direction of the to-be-heated material 7 Inductor motor 25R for moving bogie 28R with fixed inductor 6R so as to adjust the distance of 6R), and inductor 6R fixed to bogie 28R moved by inductor motor 25R. An inductor position detector 26R which detects the position of as a measured inductor position detection value, an inductor position converter 22R which converts a target amount of electric power set by the heating condition setter 11 into an optimum inductor position setting value, and an inductor An inductor position deviation calculator 23R for calculating a deviation between an optimum inductor position setting value converted by the position converter 22R and a measured inductor position detection value detected by the inductor position detector 26R as an inductor position deviation, and an inductor; To position deviation calculator (23R) The inductor motor controller (24R) for controlling the inductor motor (25R) on the basis of the calculated inductor to the position error further comprises.

In addition, although one inductor 6R is shown in FIG. 6, the induction heating apparatus 1a which is a 1st modification 1 puts both left and right end sides in the short direction (width direction) of the to-be-heated material 7, 1 Large inductors 6L are further disposed.

"Action"

Next, the action of the induction heating apparatus 1a as the first modification is described with reference to FIG. 6.

First, the heating condition setter 11 receives the set value of the electric power which can be optimally heated from at least the material, the plate width, and the plate thickness of the material to be heated 7 by external input or the like, and sets the received set value of the electric power. It is set as an electric power target value and output to the inductor position converter 22R.

On the other hand, as for the to-be-heated material 7 conveyed by the conveyance roller 9, both ends side run between the upper inductor part 5Ra and the lower inductor part 5Rb of the induction heating apparatus 1a, and generate | occur | produce here Induction heating is performed by the magnetic flux.

The inductor position detector 26R measures the position of the trolley 28R to which the inductor 6R is fixed, calculates the positional information of the inductor 6R from the measured position of the trolley 28R, and serves as an inductor position detection signal. Output to position deviation calculator 23R.

The inductor position converter 22R then converts the power target value output by the heating condition setter 11 into an optimum inductor position signal.

FIG. 7 is a diagram showing the relationship between the inductor position and the power amount indicating the distance between the inductor 6R and the heated material 7. Reference numeral 701 denotes a power amount W with respect to the inductor position M. FIG.

As shown in FIG. 7, the power amount W is such that the inductor position M is increased, that is, the distance between the inductor 6R and the heated member 7 in a short direction of the heated member 7 is spaced apart. As a result, the impedance of the inductor 6R decreases, indicating that the power amount W decreases.

The inductor position converter 22R calculates the optimum inductor position by converting the power amount W into the inductor position M according to the relationship of FIG. 7, and outputs it to the inductor position deviation calculator 23R as the optimum inductor position signal. .

Next, the inductor position deviation calculator 23R receives the inductor position detection signal detected by the inductor position detector 26R. From the received inductor position detection signal and the optimum inductor position signal received by the inductor position converter 22R, the deviation between the measured inductor position and the optimum inductor position is calculated as the inductor position deviation, and the calculated inductor position deviation is calculated. The deviation signal is transmitted to the inductor motor controller 24R.

Next, the inductor motor controller 24R controls the inductor motor 25R to eliminate the deviation between the optimal inductor position and the measured inductor position, that is, the inductor position deviation received from the inductor position deviation calculator 23R is zero. The control amount is calculated and the calculated control amount is transmitted to the inductor motor 25R.

The inductor motor 25R operates based on the received control amount to horizontally move the wheel 29R provided at the bottom of the trolley 28R to which the inductor 6R is fixed in the short direction of the material to be heated 7.

Thereby, the inductor 6R fixed to the trolley | bogie 28R can be moved so that the inductor position M measured by the inductor position detector 26R may become the set optimal position. In addition, by adjusting the inductor gap H, induction heating can be performed while fine-adjusting the heating temperature against the left and right shift of the heated material 7 to be conveyed.

Claims (2)

A lower core with a heating coil wound at an end thereof, having an inductor gap with a predetermined interval therebetween, the upper core being wound with a heating coil at the end thereof, and a rotating portion of the upper core with respect to the lower core An inductor having a hinge portion supported by the shaft so as to be capable of being axially formed, and for heating a heated material conveyed between the inductor gaps; Power amount detecting means provided in an energizing circuit of said heating coil and detecting an amount of power supplied to said heating coil; Heating condition setting means for setting an optimum heating condition of the heating coil from at least a material, a plate width, and a plate thickness of the material to be heated by the inductor, and setting a target value of electric power according to the set optimum heating condition; An inductor gap value converting means for converting the set power amount target value into an optimum inductor gap value and converting the amount of power detected by said power amount detection means into a measured inductor gap value; A gap deviation calculating means for calculating a deviation between the converted optimum inductor gap value and the measured inductor gap value as a gap deviation; Air gap motor control means for controlling the motor for rotating the upper iron core to eliminate the calculated gap deviation Induction heating apparatus comprising a. The method of claim 1, An inductor motor for moving the inductor so as to adjust a distance in a short direction of the heated material and the inductor of the inductor; Inductor position detecting means for detecting a position of the inductor moved by the inductor motor as a measured inductor position detection value; Inductor position converting means for converting a target amount of electric power set by said heating condition setting means into an optimum inductor position setting value; Inductor position deviation calculating means for calculating a deviation between the optimum inductor position setting value converted by the inductor position converting means and the measured inductor position detection value detected by the inductor position detecting means as an inductor position deviation; Inductor motor control means for controlling the inductor motor to eliminate the inductor position deviation calculated by the inductor position deviation calculating means Induction heating apparatus characterized in that it further comprises.

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