KR20030046259A - Apparatus for adjusting temperature deviation of continuos reheating furnace automatically - Google Patents

Abstract

PURPOSE: A temperature deviation adjusting apparatus is provided to maintain a continuous heating furnace by measuring a temperature deviation of a roll and spraying cooling gas to a part having the temperature deviation. CONSTITUTION: A thermometer roll(110) is installed spaced from a roll(2). A cooling gas spraying device(120) is provided on an upper portion of a heat shielding plate(4) in order to spray cooling gas towards a surface of the thermometer roll(110). The cooling gas spraying device(120) includes a cooling gas jet mounted on an upper surface of the heat shielding plate(4) and six nozzles provided at an upper portion of the cooling gas jet(121). A feeding pipe is connected to the cooling gas jet(121) and various valves are installed at a middle part of the feeding pipe(122). A cooler(125) is installed at the middle part of the feeding pipe in order to cool a gas fan(124) and gas contained in the heating furnace.

Description

{Apparatus for adjusting temperature deviation of continuos reheating furnace automatically}

The present invention relates to a device for automatically adjusting the temperature deviation of a continuous furnace to reduce the temperature variation of the roll, and more particularly, to measure the temperature deviation of the roll by using a temperature measuring roll in the furnace, and to generate a cooling gas when a temperature deviation occurs. The present invention relates to a device for automatically adjusting the temperature deviation of a continuous furnace, which can be sprayed onto a roll surface to improve the sheet-passing property in the furnace.

In general, in order to ensure smooth productivity of the continuous heat treatment process of performing continuous heat treatment, tracking of the heating furnace should be ensured.

Sheet metal sheeting technology that is stable to various operating variables and various materials is very important in terms of productivity and operability.

Therefore, it is very important for the stable operation in the heating furnace to solve problems such as a buckle (Heat Buckle) that occurs in the direction of the steel sheet during the heat treatment and mis-tracking that moves to the left and right of the sheet roll. It is also important to speed up the process.

In continuous heating furnaces, meandering occurs at the front end (first part) of the heating table and buckle occurs at the latter part of the heating table and at the cracking zone.

The meandering generated at the front end of the heating table is caused by the shape of the steel plate and the dermal crown of the driving roll during the heat treatment of the cold rolled steel plate. Due to crown and overheating.

Since the meander and the buckle are interlocked with each other in opposite relations, in order to maintain stable mail flow in the furnace, control should be taken into account rather than individual control.

The temperature in the furnace to heat-treat the steel sheet is constant at about 870 ℃, but the cold steel sheet is brought into contact with the roll and takes the surface temperature of the roll up to the section where the steel sheet temperature is 600 ℃ among the front ends of the furnace where the cold steel sheet enters. The temperature of the part is lowered, and both ends of the roll are not in contact with the cold steel sheet, thereby maintaining the temperature in the furnace.

Due to the temperature difference between the middle and both ends of the roll, a thermal crown is formed due to thermal expansion, which causes meandering of the steel sheet.

On the contrary, since the temperature difference between the average temperature of the steel sheet and both ends of the roll is not large from the middle to the rear end and the cracking zone of the heating furnace where the temperature of the steel sheet is 600 ° C. or more, the risk of heat buckles increases rather than meandering.

1 is a configuration diagram showing a part of a typical continuous heating, Figure 2 is an excerpt of the main portion of FIG.

As shown in Figure 1 and 2, the upper portion of the heating furnace (1), the roll (2) for guiding the steel sheet (S) is continuously installed at a predetermined interval, radians radiating radiant heat below the roll (2) The tube 3 is installed.

Therefore, it is comprised so that the temperature inside the heating furnace 1 may be raised to the heat source discharge | released from the radian tube 3, and the steel plate S is heated and annealed.

In the continuous heating furnace as described above, due to the temperature difference between the middle portion and the both end portions of the roll 2, a thermal crown is formed due to the thermal expansion of the roll to cause meandering of the steel sheet.

On the contrary, the temperature difference between the average temperature of the steel sheet S and both ends of the roll is not large from the middle of the furnace to the rear end and the cracking zone where the temperature of the steel sheet S passing the front end of the heating furnace is 600 ° C. or more. The risk of heat buckles is greater.

In order to solve this problem, the heat shield plate 4 is conventionally installed between the roll 2 and the radian tube 3, but this not only prevents the progress of the steel sheet S but also prevents the heat shield plate 4 from itself. Radiant heat does not give much effect.

The present invention has been invented to solve the above problems, the purpose of which is to measure the temperature deviation of the roll by using a temperature measuring roll in the heating furnace, and when the temperature deviation occurs, the control unit sprays the cooling gas only in the temperature deviation occurrence area inside the heating furnace It is to provide an automatic control of the temperature deviation of the continuous heating furnace to improve the mail flow of the.

1 is a configuration diagram showing a part of a typical continuous heating,

Figure 2 is an excerpt of the main portion of Figure 1,

3 is a schematic view showing a temperature deviation adjusting device of a continuous heating furnace of the present invention;

4 is a perspective view showing a cooling gas jet of the present invention,

5 is an excerpt of the main portion of the present invention,

Figure 6 is a roll crown formation of the present invention.

※ Explanation of symbols about main part of drawing ※

N: Nozzle S: Steel Plate

2: normal roll 3: radian tube

4: heat shield plate 110: RTD roll

120: cooling gas injection means 130: control unit

121: cooling gas jet 122: supply piping

123: valve 124: gas fan

125: cooler

Referring to the characteristic configuration of the present invention for achieving the above object is as follows.

The present invention relates to a continuous heating furnace having a general roll provided at regular intervals to guide a steel sheet, a radian tube installed below the general roll to radiate the radiant heat, and a heat shield plate provided between the general roll and the radian tube. A temperature measuring roll is installed at regular intervals from the general roll; Cooling gas injection means provided on an upper portion of the heat shielding plate to inject cooling gas onto the surfaces of the general roll and the temperature measuring roll; And a control unit for controlling the supply of cooling gas according to the measured value of the temperature measuring roll.

The cooling gas injection means, the cooling gas jet having a nozzle on the top; A supply pipe connected to the cooling gas jet; A valve installed in the middle of the supply pipe; A gas fan installed in the middle of the supply pipe; And a cooler installed in the middle of the supply pipe and generating a cooling gas.

Hereinafter, the present invention configured as described above with reference to the accompanying drawings in detail.

Figure 3 is a schematic view showing a temperature deviation control apparatus of a continuous heating furnace of the present invention, Figure 4 is a perspective view showing a cooling gas jet of the present invention, Figure 5 is an excerpt of the present invention, Figure 6 It is a roll crown formation figure of this invention.

As described with reference to Figs. 1 and 2, the present invention is a regular roll (2) is continuously installed at regular intervals to guide the steel sheet, and the radian tube (under the general roll (2) to release the radiant heat) 3) is installed, and the heat shield plate 4 is installed between the general roll (2) and the radian tube (3). This configuration is the same as the conventional configuration.

3 to 5, the temperature measuring roll 110 is installed at regular intervals from the general roll 2, that is, the temperature measuring roll 110 is installed at every third position.

Cooling gas injecting means 120 is provided on the heat shielding plate 4 so as to spray cooling gas on the surfaces of the general roll 2 and the temperature measuring roll 110.

3 to 5, the configuration of the cooling gas injection means 120 will be described. A cooling gas jet 121 is installed on the upper surface of the heat shield plate 4, and a nozzle (above) is disposed on the cooling gas jet 121. N) is formed six.

A supply pipe 122 is connected to the cooling gas jet 121. In the middle of the supply pipe 122, various valves 123, for example, a roll crown control valve 123a-123i and a flow control valve 123j, are provided. Is installed.

In the middle of the supply pipe 122, a gas fan 124 and a cooler 125 for cooling the gas inside the heating furnace are installed.

The temperature value measured by the temperature measuring roll 110 is received by the controller 130, and the controller 130 controls the temperature deviation of the roll by operating the aforementioned cooling gas injection means 120.

Referring to the operation of the present invention configured as described above is as follows.

When the steel sheet S introduced into the heating furnace 1 causes a temperature deviation while passing through the general roll 2 and the temperature measurement roll 110, each temperature measurement roll 110 measures the temperature deviation.

The temperature measuring roll 110 may detect temperature at seven positions A, B, C, D, E, F, and G, respectively, and the value measured by the temperature measuring roll 110 may be received by the controller 130. Compare and judge temperature deviations.

When the temperature deviation occurs above the prescribed value, the control is made. First, the gas fan 124 of the temperature measurement roll 110 in which the temperature deviation occurs among the several temperature measurement rolls is driven.

By driving the gas fan 124, the gas in the heating furnace 1 is cooled to a predetermined temperature while passing through the cooler 125.

The cooling gas is divided into three supply pipes 122 through the flow rate automatic valve 123j and drawn into the respective roll crown adjustment valves 123a to 123i.

At this time, the roll crown adjustment valves 123a to 123i open only the portion where the temperature deviation occurs, and the cooling gas is transferred to the surface of the general roll 2 and the measurement roll 110 through the nozzle N of the cooling gas jet 121. Spray.

Even after the injection, the temperature measurement roll 110 continuously measures the temperature, and thus the measured value is continuously received by the controller 130, so when the roll is lowered below the prescribed temperature, the gas fan 124 is stopped and the injection is stopped.

On the other hand, with reference to Figure 5 briefly described with respect to the control method of the temperature measuring roll, the measuring point on the roll surface is seven places (A, B, C, D, E, F, G) and always the center point (D) It is a standard.

Compare the two inner places (C and E) with respect to the center point (D), then compare the two places (B and F) with the two outermost places (A and G). Each of these comparisons is at the same position in the center of the measuring roll, so if no meander occurs, they will be the same.

The average of the two measured values is calculated to make three values based on the center point. That is, the temperature of the inside (C and E), the middle (B and F), and the outside (A and G) of the measuring roll is compared with the center temperature (D) of the measuring roll.

In this way, when a temperature deviation occurs, the roll crown adjustment valves 123a to 123i of the generated portion are opened to operate. That is, three rolls are controlled with the temperature measured in one measuring roll, and the roll crown adjustment valves 123a to 123i operate in conjunction with each other.

The flow rate automatic control valve 123j serves to equalize the temperature and pressure of the heating furnace 1 when the cooling gas fan 124 is temporarily operated.

As shown in Fig. 6, a large temperature difference occurs in a portion where the steel sheet is not in contact with the portion in contact with the measuring roll, so that the crown of the measuring roll is formed differently from the originally designed crown.

Since the temperature at the center of the measuring roll in contact with the steel sheet is sharp and the both ends of the measuring roll are kept at a high temperature, a crown like a dotted line is formed. In this case, the roll crown of the present invention (the dashed dashed line) is a cooling gas jet of a gas jet. Since a temperature deviation does not generate | occur | produce by it, it becomes close to the original roll crown (solid line).

According to the present invention, the original roll crown is continuously maintained because both ends of the measurement roll 110 are continuously cooled even when the heat of the center of the measurement roll is absorbed by the steel sheet.

In addition, even if the width of the steel sheet changes, the original roll crown state does not change by adjusting the roll crown adjustment valves 123a to 123i and adjusting the flow control valve 123j. To expand.

Referring to FIG. 6, an embodiment of the present invention will be described.

Among the several temperature measuring rolls, one measurement of the temperature measuring roll 110 is performed at 850 ° C, 840 ° C, 750 ° C, 745 ° C, 754 ° C, at 7 locations (A, B, C, D, E, F, G), respectively. It measured at 850 degreeC and 855 degreeC.

This measured value is received by the control unit 130, and the control unit 130 divides this temperature into three parts.

That is, the temperature at both ends of the measuring roll 110 is (850 + 855) / 2 = 853 ° C., the inside thereof is (840 + 850) / 2 = 845 ° C., and the inside thereof is (750 + 752) / 2 = 751 ° C. And the center of the measuring roll 110 is 745 degreeC as a measured value.

Then, the difference between the respective values (853 ° C, 845 ° C, 751 ° C) and the value (745 ° C) at the center of the measuring roll 110 is calculated to be 108, 100, and 9, respectively.

If the temperature measurement roll 110 is set to 10 ° C, it can be seen that the temperature deviation occurs because the first and second values having a deviation of 10 ° C or more of the above values are larger than the setting value.

The controller 130 opens only some of the roll crown adjustment valves 123a, 123d, and 123g of the roll crown adjustment valves 123a to 123i and does not open the remaining valves.

Cooling gas is injected from the nozzle N by opening and closing the roll crown adjustment valves 123a, 123d, and 123g.

In this way the operation of the next measuring roll is carried out continuously.

The present invention can measure the temperature deviation of the roll by using a temperature measuring roll in the heating furnace, and when the temperature deviation occurs, the cooling gas is injected to the surface of the roll to improve the mail through the inside of the heating furnace to control the meandering or buckle.

Claims (2)

Plain rolls 2 continuously installed at regular intervals to guide the steel sheet S, radian tubes 3 installed below the rolls 2 to radiate the radiant heat, and the rolls 2 and radian tubes. In the continuous furnace provided with the heat shield plate (4) provided between (3), A temperature measuring roll (110) installed at regular intervals with the general roll (2); Cooling gas injection means (120) provided on the heat shield plate (4) to inject cooling gas onto the surfaces of the general roll (2) and the temperature measurement roll (110); And Control unit 130 for controlling the supply of the cooling gas in accordance with the measured value of the temperature measurement roll (110); comprising a device for automatically adjusting the temperature deviation of the continuous heating furnace. The method of claim 1, wherein the cooling gas injection means 120, A cooling gas jet 121 having a nozzle N at the top; A supply pipe 122 connected to the cooling gas jet; A valve 123 installed in the middle of the supply pipe 122; A gas fan 124 installed in the middle of the supply pipe 122; And And a cooler (125) installed in the middle of the supply pipe (122) to generate a cooling gas.