JPS62238328A - Equipment for controlling heating - Google Patents

Abstract

PURPOSE:To hold the temp. in length direction and to minimize temp. deviation in width direction in steel sheet, by controlling heating apparatus at upstream side in transferring direction of material to be rolled based on deviation between steel sheet temp. measured actually at the downstream and the aimed temp. value at the actual measurement point. CONSTITUTION:Steel sheet to be rolled in state of being transferred is heated by an induction heating apparatus 1, further the apparatus is controlled by a controlling means 4 to heat the steel sheet to a fixed temp. In controlling apparatus for heating of the constitution, a temp. detecting means 2 is arranged at downstream side to actually measure and detect steel sheet temp. and transferring velocity of steel sheet is detected by a velocity detecting means 3. An average value of actually measured temp. is calculated 7 from these detected values, the deviation with the aimed temp. value at the actually measured point of temp. is detected at a deviation detecting part 8. On the other hand, the temp. deviation in width direction is detected 13 from the actually measured temp. value. The apparatus 1 is controlled after correcting the temp. correcting signal based on these deviations further by specific velocity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heating control device for controlling the heating temperature of, for example, an induction heating device that heats a steel plate conveyed on a steel plate conveyance line in a hot rolling facility. It is something.

[Conventional technology]

Conventionally, various heating control devices have been proposed for hot rolling equipment. A temperature increase command value was set in advance in a host computer based on the width, etc., and the temperature increase command value was output to the induction heating device to control the heating of the steel plate.

The heating control f11 device is controlled based on the temperature increase command value transmitted from the upper-level subtraction machine, but this temperature increase command value is calculated based on the preset line speed and 1-. It is a constant value over the entire length. by the way,
The actual line speed during heating (hereinafter referred to as actual line speed) does not match the line speed that was the standard when calculating the temperature increase command value mentioned above (hereinafter referred to as reference line speed). , the temperature increase command value is modified by the ratio speed between the actual line speed and the reference line speed. This modification is obtained by the following equation (1), (21). That is, TR= f (Ts, Vp) =-==
-(1) However, Ts: Temperature increase command value at standard line speed vP; Specific speed (ratio of actual line speed to standard line speed) vR: Actual line speed vs; Standard line speed [Problem to be solved by the invention Point] Conventional heating control devices are configured as described above, so the temperature increase command value, which is the basis of heating control, is not reliable, and the temperature increase command value is determined based on the specific speed. Although this has been corrected, uneven temperature distribution, such as so-called thermal random, remains along the length of the steel plate as it passes through the heating device, from the tip to the end. There was a problem in that it was impossible to correct unevenness.

In addition, for temperature gradients and temperature unevenness that occur in the width direction of the steel plate, the host computer calculates the temperature deviation between the low temperature part and the high temperature part using calculation results based on the steel plate temperature model, and then compensates for this temperature deviation. A heating temperature increase command value was set, and only the low temperature portion was heated using this heating temperature increase command value to control the temperature to a constant temperature. However, since this control is predictive control, there are problems such as the temperature deviation across the width of the steel plate after heating may not always be as set by the host computer.

Incidentally, in conventional heating control, as shown in Fig. 5, when heating is performed based on the temperature change of the steel plate at the entrance side of the induction heating device, which is indicated by the solid line (B), the output of the induction heating device, which is indicated by the dotted line (B), is heated. The temperature change of the steel plate on the side is the entrance side temperature change (5)
As mentioned above, the non-uniform temperature distribution on the inlet side remains as is in the temperature distribution on the outlet side.

This invention was made in order to solve the above-mentioned problems, and the steel plate temperature is controlled over the entire length of the steel plate to be heated based on the actual temperature value of the steel plate being tapped by an induction heating device.
The purpose of the present invention is to provide a heating control device that can produce rolled products with proper shapes without disturbances by keeping the temperature of the steel plate constant in the width direction and minimizing the temperature deviation in the width direction of the steel plate. do.

[Means for solving problems]

The heating control device according to the present invention includes a temperature detection means provided on the conveyance downstream side (i.e., the exit side) of a heating device provided along the conveyance path of a material to be rolled such as a steel plate, and a temperature detection means that is Comprising a calculation means that compares and calculates the deviation between the actual measured temperature detection value and the target temperature value at the actual measurement point of the steel plate and outputs it to the heating device, and correction that compares the actual measured temperature at the exit side of the steel sheet heating device with the target temperature. The heating control device according to the present invention is configured to perform feedback control of the heating device based on the signal. Instead of actually measuring the temperature value, correcting this measured temperature value in the length direction and two width directions of the steel plate, and further correcting the specific speed of this correction signal and controlling with a predicted value based on the temperature at the entrance side of the heating device, Based on the measured temperature distribution on the exit side, the length direction of the pressurized material 1
It is now possible to control the heating device by taking into account all the factors that affect the temperature of the steel plate, such as the width direction and conveyance speed.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, l is an induction heating device, 2 is a temperature detecting means provided on the outlet side thereof, 3 is a conveyance means, for example, a speed detecting means provided below the table, 4 is a control means of a heating control device, and 5 is a A length calculation unit that calculates the length of a steel plate as a material to be rolled based on the detected values of the temperature detection means 2 and the speed detection means 3; 6 is a sample of the temperature of the surface of the steel plate actually measured by the temperature detection means 2; 7 is a temperature average value calculation unit that calculates the average value of the measured temperature in a certain length of the steel plate based on the signal from the sampling unit 6 and the signal from the skill calculation unit 5; 8 is the temperature average value calculation unit; A deviation detection section 9 detects the deviation between the input from the value calculation section 7 and the target temperature value, and a limiter 110 indicates the output characteristic of the temperature deviation exceeding the allowable deviation value detected by the deviation detection section 8. The output part of the gain G, 11 represents the output characteristics after being multiplied by the adjustment gain G. The limiter 12 is outputted from the limiter 11, inputs the next temperature increase command value, and calculates the temperature deviation and target in the width direction, which will be described later. 13 is a deviation detection unit that detects a deviation in the width direction of the actually measured temperature from the temperature detection unit 2; 14 is an output that multiplies the signal of the deviation detection unit 13 by an adjustment gain K; A limiter 116 inputs the signal outputted from the detection section 12, and corrects the specific speed based on the ratio of the signal from the speed detection means 3 and the set speed, and controls the heating device. This is a specific speed correction means that outputs to 1. The heating device 1 is composed of, for example, a high-frequency induction heating device, and as shown in FIG.
The heating coils 22, 22 are disposed vertically to sandwich a steel plate 25 as a material to be rolled, which is conveyed in the direction of the arrow by the rollers 24 of the conveying means 23.

Next, the operation will be explained. First, the outlet side of the heating device 1 (
The temperature of the steel plate 25 is actually measured by the provided temperature detecting means 2, and is inputted to the widthwise temperature deviation detecting means 13 of the sampling section 62 as a temperature signal S1, as shown in FIG. 3(a). The length calculating section 5 receives the plate detection signal S2 separately sent from the temperature detecting means 2 and the speed signal S3 detected by the speed detecting means 3, and uses these two signals S2. S
3, the timing signal S4 is output to the temperature average value calculation section 7. The temperature signal S1 is input to the sampling section 6, and the sampling section 6 outputs it as a sample value to the temperature average value calculation section 7.The temperature average value calculation section 7 converts the sample value into a steel plate based on the timing signal S3. 25
The average value sL (see FIG. 3(b)) over a certain length is output to the deviation detection section 8.

The deviation detection section 8 detects the deviation amount T+ (see FIG. 3(e)) from the target value To shown in FIG. The deviation TM shown in FIG. 3(d) is calculated, and after this deviation TM is multiplied by the adjustment gain G, the temperature increase command signal T'M is outputted to the deviation detection section 12 through the limiter 11 (see FIG. 3(f)). . In the deviation detection section 12, the width direction correction signal TE (see FIG. 3(e)) multiplied by the adjustment gain K from the width direction deviation detection means 13 and outputted through the limiter 15 is superimposed with the temperature increase command signal Ts. , (see FIG. 3(g)) A temperature correction signal T's (see FIG. 3(h)) is obtained. The output correction signal TR is outputted to the heating device 1 after the specific speed is corrected by the speed signal S3. In the above heating control, the target temperature The deviation is proportionally controlled and output to the induction heating device in steps. Furthermore, a temperature increase correction signal that minimizes the temperature deviation in the width direction of the steel sheet is superimposed on this command value.

FIG. 4 shows the temperature change on the inlet side of the heating device and the temperature change on the outlet side in the heating control according to the above embodiment.

In FIG. 4, it can be seen that heating control is performed as shown in () of the temperature change on the outlet side without being influenced by the temperature change on the input side.

〔Effect of the invention〕

As described above, according to the present invention, the temperature correction signal is outputted based on the actual measurement value of the temperature detection means on the output side of the heating device, with corrections made in the length direction and width direction based on the speed of the conveying means. Since the heating is controlled using a temperature correction signal, the thermal randomness on the steel plate remains even after induction heating as in conventional methods, but the temperature gradient after induction heating can be removed, and the temperature gradient in the longitudinal direction There is an effect that a rolled material at a constant temperature can be obtained in both the , and @ directions.

Therefore, it is possible to obtain a heating control device that can prevent disturbances caused by uneven heating conditions and can manufacture rolled products having appropriate shapes.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a heating side @ device according to an embodiment of the present invention, FIG. 2 is a system configuration diagram similarly applied to a rolling line, and FIG. 3 is a characteristic diagram similarly showing signals of each part.
FIG. 4 is a characteristic diagram similarly showing temperature changes, and FIG. 5 is a characteristic diagram showing temperature changes of a conventional heating control device. In the figure, 1 is a heating device, 2 is a temperature detection means, 4 is a control means, 5 is a length calculation section, 6 is a sampling section, 7 is a temperature average value calculation section, 13 is a width direction temperature deviation detection means, 16
is specific speed correction means. Note that the same reference numerals in the figures indicate the same or corresponding parts. Figure 1〆4 Figure 3

Claims (3)

[Claims] (1) It has a heating device that heats a long, plate-shaped material to be rolled that is conveyed in a certain direction by a conveying means, and a control means that controls the heating device so that the steel plate is heated to a constant temperature. In the heating control device, the control means is provided on the downstream side of the heating device in the direction of conveyance of the rolled material, and temperature detection means for actually measuring and detecting the temperature of the heated steel plate;
Calculating means for comparing and calculating the deviation between the actual temperature detection value detected by the temperature detecting means and the target temperature value at the actual measurement point of the temperature of the rolled material, and outputting a correction signal to the heating device to bring this deviation within a certain value. A heating control device comprising: (2) The control means includes a temperature detection means for actually measuring and detecting the temperature of the rolled material at a fixed sampling period, and a temperature average of sample values detected by the temperature detection means at fixed distances in the longitudinal direction of the rolled material. calculation means that calculates the temperature average value, compares and calculates the deviation between this temperature average value and the target temperature value at the actual measurement point of the rolled material, and outputs a correction signal to the heating device in a stepwise manner to correct the deviation to within a certain value. A heating control device according to claim 1, comprising: (3) The control means includes a length calculation section that calculates the length of the material to be rolled based on the measured temperature detection value from the temperature detection means and the detection signal from the speed detection means; a sampling section that samples the actually measured temperature; a temperature average value calculation section that calculates a temperature average value based on the sample value of this sampling section and the length of the rolled material calculated by the length calculation section; and this temperature average value. a calculation unit that outputs the deviation from the target temperature value to a limiter and outputs a lengthwise temperature increase command signal via the limiter; and a calculation unit that calculates the temperature deviation in the width direction of the rolled material based on the measured temperature detection value. a width direction temperature correction section that outputs a width direction temperature correction command signal via a limiter, and performs specific speed correction based on the longitudinal direction temperature increase command signal, the width direction temperature correction command signal, and the speed detection signal. 3. The heating control device according to claim 1, further comprising: a specific speed correction unit configured to perform temperature correction and output a temperature correction signal to the heating device.