JPH0557415A - Sensor for controlling secondary cooling state of continuous casting apparatus, dummy bar provided with this sensor, and control method for continuous casting apparatus - Google Patents

Abstract

PURPOSE: To provide a sensor which shifts the front part of a secondary cooling boom provided with water spraying devices arranged in a bay mutually separating each of rolls to control the secondary cooling state in the continuous casting apparatus, a dummy bar provided with this sensor and the control method of the continuous casting apparatus. CONSTITUTION: The sensor is constituted with a small dimensional closed chamber 1 and one of walls 3 in the closed chamber 1 is made of a heat-insulating material, and in the wall 3, a heat-conductive pin 12 faced to the secondary cooling boom 21 at the shifting time of the sensor, is arranged and the remaining walls of the closed chamber 1 are made of the heat-insulating material, and in the closed chamber 1, electric resistance heaters 6, 7 for adjusting the temp. in the closed chamber 1 to a reference value and a temp. sensor 11 are disposed. In this way, the cooling effect with each water spray device in the secondary cooling system can quickly and accurately be measured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a secondary cooling boom (rampes) for spray cooling using a spraying element composed of a spray nozzle or an atomizer.
ravees) in the continuous casting equipment.

[0002]

2. Description of the Related Art If the time during which a continuous casting machine is stopped can be shortened, the productivity of the continuous casting machine will be improved. For that purpose, a means for controlling the current state of the continuous casting apparatus is required, and in particular, the operating state of the secondary cooling boom must be properly adjusted. Devices that measure flow and pressure are commonly used to adjust the current state of the secondary cooling boom. However, these known devices have the function of detecting a serious abnormality such as when the sprinkler group is completely clogged or when the supply hose is disconnected, or the excess water from the secondary cooling boom sprinkler at low flow velocity. There is only a function to confirm that it is not supplied to, and it is hard to say that it is satisfactory. In this adjustment method, local fluctuations are gradually transmitted to the components of the sprinkler pipe, which disturbs the tertiary cooling system, and the regulator of the secondary cooling water supply control system does not work. There is a risk of causing a situation. Such a situation is not preferable in terms of product quality, because many products are manufactured by the continuous casting machine before defects are actually detected.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sensor capable of accurately and reliably controlling the secondary cooling state.

[0004]

SUMMARY OF THE INVENTION The present invention controls the secondary cooling condition of a continuous casting machine moving in front of a secondary cooling boom with sprinklers in the bays separating the rolls from each other. In this sensor, the sensor consists of a small size liquid-tight closed chamber, one wall of which is made of insulating material, which wall faces the secondary cooling boom when the sensor moves. Is provided with a heat-conducting pin, the remaining walls of the closed chamber are made of an insulating material, and at least one electric resistance heater is arranged in the closed chamber,
The electric resistance heater is energized to adjust the temperature in the closed chamber to a reference value, and a temperature sensor is installed in the closed chamber to provide a sensor.

Information that more accurately represents the operating condition of the secondary cooling boom is obtained by measuring the temperature.
Another feature of the invention is that the sensor comprises at least one electrical resistance heater in a closed chamber. In a specific example, the sensor comprises a low power electrical resistance heater for setting the temperature in the closed chamber and a high power electrical resistance heater for adjusting the outside air temperature of the closed chamber.

Another feature of the invention is that the time constant of the temperature control device is longer than the time required to pass in front of the cooling boom and less than the time passed between two secondary cooling booms. It is in.

Another subject of the invention is a dummy bar for an apparatus for continuous casting of ingots, the tip of which comprises means for controlling the continuous casting apparatus. The dummy bar has two rows of sensors, the first row of sensors is installed to face the outer surface of the ingot, and the second row of sensors is installed to face the inner surface of the ingot. Each sensor is placed opposite one sprinkler or, in a variant, each sensor is placed in the area covered by the two sprinklers on either side of one secondary cooling boom.

Yet another object of the present invention is a method of controlling a secondary cooling boom of a continuous casting machine. The method of the present invention is characterized in that the dummy bar is moved forward to plot a temperature curve, and the temperature curve is compared with a reference temperature curve.
In the method of the present invention, the reference temperature curve is empirically determined, and the temperature curve plotted as the dummy bar passes through the continuous casting apparatus is compared with this reference curve to ensure that the secondary cooling device is operating normally. You can check that. The temperature curve from the sensor is preferably plotted as a change curve independent of the moving speed of the dummy bar. The present invention will be better understood from the following description of embodiments with reference to the accompanying drawings.

[0009]

EXAMPLE In the present invention, a temperature sensor is installed at a position occupied by the skin portion of the slab while the continuous casting apparatus is in operation, facing the secondary cooling boom. FIG. 1 is a conceptual cross-sectional view of the sensor of the present invention. This sensor basically consists of a liquid-tight closed chamber 1 of small dimensions. This closed chamber is formed by, for example, a recess formed in the case 2. The case 2 is preferably made of a corrosion resistant and heat resistant material. The open surface of the closed chamber 1 is closed by a cover 3 made of an insulating material, and a heat conductive pin 12 is provided at the center of the cover 3. The cover 3 is fixed to the case 2 with screws 4, and the closed chamber 1 is closed with an O-ring 5. Briefly, the closed chamber or recess 1 is a small volume sealed chamber that is thermally insulated except for the pins 12 provided on the cover 3. At least one electric resistance heater for setting the temperature of the closed chamber 1 to a reference temperature is provided in the closed chamber 1. In the illustrated embodiment, the closed chamber 1 is provided with two electric resistance heaters 6, 7. The first low power resistance heater 6 serves to balance and maintain the outside air at a reference temperature, and the second high power resistance heater 7 passes under the secondary cooling boom to rapidly cool the cooled temperature. Serve to raise. The reference temperature is, for example, 70 ° C., and the second high power resistance heater 7 is adjusted so as to immediately heat the closed chamber 1 when the ambient temperature changes in a relatively narrow range, for example, 3 ° C. as compared with the reference value. To be done. The case 2 has a metal fitting 8 with a screw for fixing the sensor to the substrate. It is preferable to use an O-ring 9 to bring the case 2 into close contact with the substrate. The temperature at the pin 12 position is measured by a temperature sensor. This temperature sensor is preferably composed of an integrated circuit 11 installed in the closed chamber 1 in the vicinity of a pin 12 which is a heat conducting surface of the closed chamber 1. The pin 12 is preferably located at a position exposed to the action of the secondary cooling boom and on the path through which the skin layer of the slab that moves during the operation of the continuous casting apparatus passes. The sensor is used as follows. That is, the resistance heater is adjusted so that the temperature of the air in the closed chamber is maintained at a constant value, for example, 70 ° C. The sensor of the present invention is arranged at the position facing the secondary cooling boom and on the path through which the skin layer of the slab that moves during the operation of the continuous casting apparatus passes, and the cooling transmitted through the heat conductive pin 12 The state is measured by the integrated circuit 11. Then, the heating adjustment device is operated by using the resistance heater to return the temperature to the reference value.

FIG. 2 conceptually shows the head of a starting bar, that is, a dummy bar, which is inserted into the continuous casting apparatus at the start of casting. The invention also relates to this starting bar or dummy bar which is introduced into the continuous casting machine at the start of casting. This start bar is equipped with sensors that measure all the parameters of the mold in order to adjust to the correct operating conditions. This dummy bar is inserted to the bottom of the continuous casting machine without any casting, and moved through the continuous casting machine to measure various parameters. This dummy bar is equipped with the temperature sensor of the present invention. The temperature sensors are arranged in two rows in the moving direction of the slab. In the first example, one sensor is provided for each cooling water sprinkler. In this case, each sensor is installed at a position corresponding to the position of the cooling water sprinkler. In another embodiment, each sensor is installed in the area covered by two cooling water sprinklers adjacent to each other. In this case, the number of sensors is one less than the number of cooling water sprinklers. The dummy bar has two rows of sensors, the first row of sensors is installed so as to pass over the outer surface of the mold, and the second row of sensors is installed so as to pass over the inner surface of the mold. When adjusting the continuous casting equipment, especially the secondary cooling water sprinkler of the mold to the correct operating condition, insert a dummy into the bottom of the continuous casting equipment and move the dummy bar so that the head of the dummy bar is not Pass in front of the roll and bay. With this operation, it is possible to measure all the operating parameters of the continuous casting apparatus by passing the dummy bar once, and it is possible to make adjustments to obtain correct operating conditions, if necessary.

In controlling the secondary cooling device, the temperature at the pin 12 is continuously measured during the movement of the dummy bar and the temperature change curve, ie, the temperature profile, during the movement of the dummy bar is plotted. As can be seen from FIG. 2, every time the sensor passes in front of the secondary cooling boom 21 installed in the bay 22 between the two rolls 23, the temperature T of the pin 12 is the reference value T.
Slightly down from c. The regulator energizes the high power resistance heater to bring the temperature back to the reference value. This change is repeated each time the sensor passes in front of the secondary cooling boom. It is preferable that the time constant of the temperature adjusting device that adjusts the temperature T is set to be longer than the time for passing in front of the secondary cooling boom 21 to clearly detect the temperature change. It is also preferable that the time is shorter than the time of passing between two adjacent secondary cooling booms so that the temperature returns to the reference temperature when the sensor passes in front of the roll 23. Curve A plotted
It is possible to know whether or not the secondary cooling boom is defective by comparing with the reference temperature curve corresponding to the optimum operating condition of the secondary cooling device. When taking curve A,
It is preferable to use a signal corresponding to the time variation of the temperature at pin 12. By doing so, the influence due to the speed difference when passing in front of the secondary cooling boom can be avoided, and the accuracy of the system can be improved. When the parts of the continuous casting machine are repaired, it is preferable to modify the reference curve and the temperature control device each time so that the operation can be carried out under full thermal conditions. Before measurement, use a low power resistance heater to adjust the temperature at pin 12 to Tc, eg 70 ° C.
To The high power resistance heater is only responsible for correcting the temperature changes that occur as the slab passes in front of the secondary cooling boom. The threshold value of the temperature change for starting the reheating by the high power resistance heater is, for example, 3 ° C. The present invention can quickly and accurately measure the cooling effect of each sprinkler of the secondary cooling system. In particular, the present invention can balance each sprinkler. In addition, sprinklers that do not operate normally can be stopped if necessary.

[Brief description of drawings]

FIG. 1 is a conceptual sectional view of a sensor of the present invention.

FIG. 2 is a conceptual explanatory view of the head of a dummy bar inserted into a continuous casting device at the start of casting.

[Explanation of symbols]

1 Closed chamber 2 Case 3 Cover 6, 7 Electric resistance heater 11 Temperature sensor 21 Secondary cooling boom 22 Bay 23 Roll

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical indication location G01K 13/06 7267-2F (72) Inventor Bernard Vuan d'Ambiyutsushiyu France 59470 Zezier Suka Percyu Mandou Kacell 5

Claims (10)

[Claims] 1. A secondary cooling state of a continuous casting apparatus, which moves in front of a secondary cooling boom (21) having a sprinkler provided in a bay (22) separating each roll (23) from each other, is controlled. In the sensor for operating, this sensor consists of a liquid-tight closed chamber (1) of small dimensions, one wall (3) of this closed chamber (1) is made of an insulating material and is attached to this wall (3). Is equipped with thermally conductive pins that are installed to face the secondary cooling boom (21) when the sensor is moved, and the remaining walls of the closed chamber (1) are made of insulating material At least one electric resistance heater (6, 7) is arranged in the chamber (1),
This electric resistance heater (6, 7) is energized to adjust the temperature in the closed chamber (1) to a reference value, and the closed chamber (1)
A sensor characterized in that a temperature sensor (11) is installed inside. 2. The sensor according to claim 1, wherein the temperature sensor (11) is an integrated circuit. 3. An electric resistance heater comprising two electric resistance heaters (6, 7) arranged in a closed chamber (1).
(6) is a low power resistance heater to set the reference temperature, the other electric resistance heater (7) is a high power resistance heater to adjust the outside air temperature at the pin (12). The sensor according to claim 1 or 2. 4. The control reference temperature is about 70 ° C. 3.
The sensor described in. 5. The time constant of the temperature regulating device is longer than the time required to pass in front of the cooling boom and shorter than the time required to pass between two secondary cooling booms.
5. The sensor according to any one of items 4 to 4. 6. A dummy bar for a continuous casting device, comprising a row of sensors according to any one of claims 1 to 5 in a dummy bar for a continuous casting device, which has a means for controlling the continuous casting device at a tip portion thereof. Is a dummy bar that is installed so as to face the outer surface of the ingot, and the second sensor row is installed so as to face the inner surface of the ingot. 7. The operation of each secondary cooling boom with a plurality of sprinklers, wherein each sensor of the dummy bar is installed so as to pass in front of one sprinkler of one secondary cooling boom. The dummy bar according to claim 6 for carrying out. 8. Each secondary with a plurality of sprinklers, wherein each sensor of the dummy bar is installed to pass in front of the area covered by the two sprinklers on each side of one secondary cooling boom. A dummy bar according to claim 6 for monitoring the operation of a cooling boom. 9. The secondary casting apparatus according to claim 6, wherein the dummy bar according to claim 6 is moved to plot a temperature curve, and the temperature curve is compared with a reference temperature curve. How to control the cooling boom. 10. The method of claim 9, utilizing a signal provided by the sensor that corresponds to the amount of displacement of the temperature.