KR101320345B1 - Device for measuring temperature of molten steel in tundish and method therefor - Google Patents

Abstract

The present invention relates to a molten steel temperature measuring device and a method for measuring the molten steel temperature in the tundish, for this purpose, the temperature measuring means for immersed in the molten steel of the tundish to measure the molten steel temperature, and on the cover of the tundish Installed and operated, the drive means for vertically adjusting the immersion depth of the temperature measuring means fixedly coupled, and calculates the amount of molten steel in the tundish according to the measured weight of the tundish, the temperature measuring means in accordance with the calculated molten steel It provides a controller for controlling the drive means so that the temperature measuring position of the variable.

Description

Molten steel temperature measuring device in tundish and its method {DEVICE FOR MEASURING TEMPERATURE OF MOLTEN STEEL IN TUNDISH AND METHOD THEREFOR}

The present invention relates to molten steel temperature measurement, and more particularly, to a molten steel temperature measuring apparatus and method for measuring the molten steel temperature in the tundish.

In general, a continuous casting machine is a facility for producing cast steel of a certain size by receiving a molten steel produced in a steelmaking furnace and transferred to a ladle (Tundish) and then supplied to a continuous casting machine mold.

The continuous casting machine includes a ladle for storing molten steel, a playing mold for cooling the tundish and the molten steel discharged from the tundish for the first time to form a casting cast having a predetermined shape, and the casting cast formed in the mold connected to the mold. It includes a plurality of pinch rolls.

In other words, the molten steel tapping out of the ladle and tundish is formed as a cast piece having a predetermined width, thickness and shape in a mold and is transferred through a pinch roll, and the cast piece transferred through the pinch roll is cut by a cutter. It is made of slabs (Slab), Bloom (Bloom), Billet (Billet) and the like having a predetermined shape.

Related prior arts are Korean Patent Publication No. 2009-112098 (published date; 2009.10.28).

The present invention provides a molten steel temperature measuring apparatus and method for measuring the molten steel temperature while varying the temperature measuring position of the temperature measuring means according to the change of the molten steel level in the tundish.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above.

In the tundish molten steel temperature measuring apparatus of the present invention for realizing the above object, the temperature measuring means for immersed in the molten steel of the tundish to measure the molten steel temperature; A driving means installed and operated on the cover of the tundish and vertically adjusting the immersion depth of the temperature measuring means fixedly coupled; And a controller configured to calculate the amount of molten steel in the tundish according to the measured weight of the tundish, and to control the driving means such that the temperature measuring position of the temperature measuring means is varied according to the calculated amount of molten steel.

The controller calculates the molten steel level in the tundish by using the calculated molten steel, calculates the temperature measuring position which is a relative moving distance from the reference position according to the calculated molten steel level, and the temperature measuring means is used as the temperature measuring position calculated above. It can be controlled to move vertically.

The storage device may further include a storage unit configured to store information about the weight of the tundish, the amount of molten steel, and the current temperature measurement position.

The drive means may comprise a pneumatic cylinder or a hydraulic cylinder.

In the tundish molten steel temperature measuring method of the present invention for realizing the above object, the step of calculating the molten steel using the weight of the periodically measured tundish; Calculating a molten steel level in the tundish using the calculated molten steel amount, and calculating a target temperature measuring position of the temperature measuring means according to the calculated molten steel level; And moving the temperature measuring means to the target temperature measuring position calculated above.

The temperature measurement position may be a relative moving distance from the reference position according to the molten steel level.

In the calculating of the molten steel amount, the molten steel may be calculated using the weight of the measured tundish when the weight of the measured tundish is different from the weight of the tundish measured immediately before.

When the temperature measuring means is moved, it may be vertically moved by a distance corresponding to the distance difference between the current temperature measuring position and the target temperature measuring position according to the calculated molten steel level.

When the weight of the tundish measured above is equal to the weight of the tundish measured immediately before, the temperature measuring means may be maintained at the current temperature measuring position.

According to the present invention as described above, by measuring the molten steel temperature while varying the temperature measuring position of the temperature measuring means according to the change of the molten steel level in the tundish, the molten steel temperature in the tundish during continuous casting operation in continuous at a constant position in real time from the hot water surface It is possible to monitor and detect the accident in advance when the molten steel temperature is detected, so that there is an advantage that can be quickly responded.

1 is a conceptual diagram showing a continuous casting machine according to an embodiment of the present invention mainly on the flow of molten steel.
2 is a perspective view from above of the tundish of FIG. 1;
3 is a view showing a molten steel temperature measuring apparatus according to an embodiment of the present invention.
4 is a view showing in detail the temperature measuring means and the driving means of FIG.
Figure 5 is a flow chart showing a molten steel temperature measurement process according to an embodiment of the present invention.
6 and 7 are views for explaining the change in the amount of molten steel in the tundish during ladle exchange.
8 is a view showing for explaining the movement of the temperature measuring means according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like elements in the figures are denoted by the same reference numerals wherever possible. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

1 is a conceptual diagram showing a continuous casting machine according to an embodiment of the present invention mainly on the flow of molten steel.

Continuous casting is a casting process in which a molten metal is continuously cast into a bottomless mold while continuously drawing a steel ingot or steel ingot. Continuous casting is used to manufacture slabs, blooms and billets, which are mainly rolled materials, and long products of simple cross-section such as square, rectangle, and circle.

The shape of a continuous casting machine is classified into a vertical type and a vertical bending type. In Fig. 1, a vertical bending type is illustrated.

1, the continuous casting machine may include a ladle 10 and a tundish 20, a mold 30, a secondary cooling stand 60 and 65, a pinch roll 70, and a cutter 90 have.

The tundish 20 is a container that receives the molten metal from the ladle 10 and supplies the molten metal to the mold 30. In the tundish 20, the supply rate of the molten metal flowing into the mold 30 is controlled, the molten metal is distributed to each mold 30, the molten metal is stored, and the slag and the nonmetallic inclusions are separated.

The mold 30 is typically made of water-cooled copper and allows the molten steel to be primary cooled. The mold 30 has a pair of structurally opposed faces open to form a hollow portion for receiving molten steel. In the case of manufacturing the slab, the mold 30 includes a pair of barriers and a pair of end walls connecting the barriers. Here, the end wall has a smaller area than the barrier. The walls of the mold 30, mainly short walls, may be rotated away from or close to each other to have a certain level of taper. This taper is set to compensate for the shrinkage due to the solidification of the molten steel M in the mold 30. The degree of solidification of the molten steel (M) will vary depending on the carbon content, the type of powder (steel cold Vs slow cooling), casting speed and the like depending on the steel type.

The mold 30 is formed such that a solidified shell or a solidified shell 81 is formed so as to maintain the shape of the casting pluck pulled out from the mold 30 and to prevent the molten metal from being hardly outflowed from flowing out. . The water-cooling structure includes a method using a copper tube, a method of water-cooling the copper block, and a method of assembling a copper tube having a water-cooling groove.

The mold 30 is oscillated by the oscillator 40 to prevent the molten steel from sticking to the wall of the mold. Lubricant is used to reduce friction between the mold 30 and the solidification shell 81 and prevent burning during oscillation. As the lubricant, there is oil to be sprayed and powder added to the molten metal surface in the mold 30. The powder is added to the molten metal in the mold 30 to become slag, as well as lubrication of the mold 30 and the solidification shell 81, as well as to prevent oxidation and nitriding of the molten metal in the mold 30, to keep warm, and to the surface of the molten metal. It also performs the function of absorption of emerging nonmetallic inclusions. A powder feeder 50 is installed to feed the powder into the mold 30. The portion of the powder feeder 50 for discharging the powder is directed to the inlet of the mold 30.

The secondary cooling zones 60 and 65 further cool the molten steel primarily cooled in the mold 30. The primary cooled molten steel is directly cooled by the spraying means 65 for spraying water while being maintained by the support roll 60 so that the coagulation angle is not deformed. The solidification of the cast steel is mostly made by the secondary cooling.

The drawing device adopts a multidrive method using a pair of pinch rolls 70 and the like so as to pull out the cast pieces without slipping. The pinch roll 70 pulls the solidified tip of the molten steel in the casting direction, thereby allowing the molten steel passing through the mold 30 to continuously move in the casting direction.

The continuous casting machine configured as described above allows the molten steel M accommodated in the ladle 10 to flow into the tundish 20. For this flow, the ladle 10 is provided with a shroud nozzle 15 extending toward the tundish 20. The shroud nozzle 15 extends to submerge the molten steel in the tundish so that the molten steel M is not exposed to air and oxidized and nitrided.

The molten steel M in the tundish flows into the mold 30 by a submerged entry nozzle 25 extending into the mold 30. The immersion nozzle 25 is disposed at the center of the mold 30 so that the flow of the molten steel M discharged from both the discharge ports of the immersion nozzle 25 can be made symmetrical. The start, the discharge speed and the interruption of the discharge of the molten steel M through the immersion nozzle 25 are determined by a stopper 21 provided on the tundish 20 in correspondence with the immersion nozzle 25. Specifically, the stopper 21 can be vertically moved along the same line as that of the immersion nozzle 25 so as to open and close the inlet of the immersion nozzle 25. The control of the flow of the molten steel M through the immersion nozzle 25 may use a slide gate method different from the stopper method. The slide gate controls the discharge flow rate of the molten steel M through the immersion nozzle 25 while the sheet material slides in the horizontal direction in the tundish.

Molten steel (M) in the mold (30) starts to solidify from a portion in contact with the wall surface of the mold (30). This is because the periphery of the molten steel M is liable to lose heat by the water-cooled mold 30. The rear portion along the casting direction of the cast slab 80 is formed into a shape in which the non-solidified molten steel 82 is wrapped in the solidifying shell 81 by the method in which the peripheral portion first coagulates.

As the pinch roll 70 pulls the front end portion 83 of the completely cast solid cast steel 80, the unsolidified molten steel 82 moves together with the solidified shell 81 in the casting direction. The non-solidified molten steel (82) is cooled by the spraying means (65) for spraying the cooling water in the up-shifting process. This causes the thickness of the non-solidified molten steel (82) to gradually decrease in the cast steel (80). When the cast steel 80 reaches one point 85, the cast steel 80 is filled with the solidification shell 81 of the entire thickness. The solidification casting 80 having been solidified is cut to a predetermined size at the cutting point 91 and is divided into a slab P such as a slab or the like.

2 is a perspective view from above of the tundish 20 of FIG. 1.

Referring to this figure, the tundish 20 has a body 22 that is open at the top to receive the molten steel (M) that is stepped out of the ladle (10). The body 22 may include a metal foil disposed on the outer side and a refractory layer disposed on the inner side of the metal foil.

The body 22 may have various shapes, for example, a straight shape. However, in the present embodiment, the body 22 having a T shape is illustrated.

A portion of the body 22 is formed with a molten metal portion 23. The pouring portion 23 is a portion where the molten steel M flowing through the shroud nozzle 15 of the ladle 10 falls. And the molten metal portion 23 can communicate with the sprue portion 24 having a larger area.

The casting portion 24 is a portion for guiding the molten steel M taken through the casting portion 23 to the mold 30. [ A plurality of openings 24a can be opened in the spout 24. An immersion nozzle 25 is connected to each of the lances 24a and guides the molten steel M of the tundish 20 to flow into the mold 30.

In general, the appropriate temperature in the tundish 20 is managed higher than the molten steel theoretical solidification temperature, the temperature is managed to a few tens of degrees higher. However, the temperature of the molten steel of the ladle carried to the tundish 20 is not always constant, and the temperature of the molten steel in the ladle during the injection of the molten steel into the tundish 20 varies depending on the injection time. If the temperature is lower than the theoretical solidification of molten steel before the molten steel is injected into the mold, there is a high risk of freezing of the tundish sink surface resulting in operation accidents. Therefore, it is important to monitor the temperature of the molten steel at all times during the playing operation. However, the conventional temperature measuring means 110 was not able to measure the temperature of the molten steel when the amount of molten steel in the tundish 20 during the ladle exchange in a manner of fixing to the tundish cover 29.

3 is a view showing a molten steel temperature measuring apparatus according to an embodiment of the present invention, the measuring apparatus includes a temperature measuring means 110, a load cell 120, a storage unit 130, a driving means 140 and a controller 150 It consists of

The temperature measuring means 110 is configured to measure the molten steel temperature by being immersed in the molten steel in the tundish 20. Temperature measuring means 110 is a temperature sensor 111 for measuring the temperature of the molten steel, a refractory body 113 formed around the temperature sensor 111 to protect the temperature sensor 111 from the high temperature of the molten steel, and the fire Coupled to the upper end of the sieve 113 may be composed of a fixed block 115 is fixed to a predetermined support (143). The temperature sensor 111 may be configured as a thermocouple having a predetermined length.

The load cell 120 is installed below the tundish 20 and configured to measure the weight of the tundish 20.

The storage unit 130 stores information about the measured weight of the tundish 20, the amount of molten steel, and the current temperature measurement position for each time zone.

On the other hand, the storage unit 130 may be previously matched with the data on the temperature measurement position (relative movement distance from the reference position) of the temperature measuring means 110 corresponding to the weight of the tundish 20 may be stored. In this case, the controller 150 extracts the temperature measuring position of the temperature measuring means 110 corresponding to the measured weight of the tundish 20 from the storage unit 130, and the temperature measuring position from which the temperature measuring means 110 is extracted. The driving means 140 will be controlled to be.

The driving means 140 is installed and operated on the tundish cover 29 to adjust the immersion depth of the temperature measuring means 110 fixedly coupled vertically. Here, the driving means 140 is installed on the tundish cover 29, as shown in Figure 4 and is operated vertically in accordance with the air pressure of the pneumatic cylinder 141 and the pneumatic cylinder 141 operated in accordance with the entry and exit of air The rod 142 and the rod 142 is fixedly coupled to one end of the rod 142 and the fixing block 115 of the temperature measuring means 110 is seated and fixed so that the temperature measuring means 110 moves vertically in the pneumatic cylinder 141. The support 143 and the air supply to the pneumatic cylinder 141 according to the control signal is adjusted according to the control valve 144 and the pneumatic cylinder 141 for varying the vertical position of the temperature measuring means 110 And an air pump 147 which detects the amount of air supplied to the air, and an air pump 147 pumping the air stored in the air tank 146 to be supplied to the pneumatic cylinder 141 through the control valve 144. . Instead of using the air volume sensor 145, the position of the temperature measuring means 110 may be indirectly sensed through a position sensor for detecting the position of the rod 142.

In the embodiment of the present invention has been described in the case where the drive means 140 is a pneumatic cylinder 141, the drive means 140 may be composed of a hydraulic cylinder or a motor including a rack and pinion. Such driving means 140 may be used a variety of known devices.

The controller 150 calculates the amount of molten steel in the tundish 20 according to the weight of the tundish 20 measured through the load cell 120, and the temperature measurement position of the temperature measuring means 110 according to the calculated amount of molten steel. The driving means 140 is controlled to be variable. That is, the controller 150 calculates the molten steel level in the tundish 20 by using the calculated molten steel amount, calculates the temperature measuring position which is a relative moving distance from the reference position according to the calculated molten steel level, and calculates the calculated temperature measuring position. The temperature measuring means 110 is controlled to move vertically.

-y)에 대입하여 기준위치로부터의 상대적인 이동거리인 목표 측온위치(z)를 구한다. 상기에서 기준값인

는 용강의 최대레벨값일 수 있다.Here, the amount of molten steel in the tundish 20 is obtained by subtracting the weight of the tundish itself from the measured weight of the tundish 20. The tundish itself weight refers to the intrinsic weight of the tundish before the molten steel is added. Then, the molten steel amount x and the molten steel level y in the tundish 20 have a proportional relationship, and the molten steel amount x in the tundish 20 is converted into a predetermined relation 1 (y = ax + b). Substituting the molten steel level y is obtained. In relation 1, the relation coefficient a and the relation constant b are constant values that can be changed according to the shape and size of the tundish 20. The controller 150 calculates the molten steel level y obtained above from a predetermined relation 2 (z =

-y) is used to find the target temperature measurement position (z), which is the relative distance from the reference position. In the above, the reference value

May be the maximum level of molten steel.

When the controller 150 moves the temperature measuring means 110 to the target temperature measuring position, the controller 150 returns the temperature measuring means 110 to the reference position and then moves to the target temperature measuring position or stored in the target temperature measuring position and the storage 130. After the distance difference with the current temperature measurement position is calculated, the temperature measurement means 110 may be moved to the target temperature measurement position by moving the temperature measurement means 110 by the corresponding distance difference. The moving distance of the temperature measuring means 110 will correspond to the amount of air supplied to the pneumatic cylinder 141, and by sensing and adjusting the amount of air, it will be possible to control the moving distance and position of the temperature measuring means 110.

5 is a flow chart showing a molten steel temperature measuring process according to an embodiment of the present invention, will be described with reference to the accompanying drawings.

First, when the continuous casting process is started, the weight of the tundish 20 is periodically measured through the load cell 120 installed in the lower portion of the tundish 20 (S11).

In the continuous casting process, the molten steel in the ladle is moved to the tundish 20 through the shroud nozzle, and then injected into the mold through the immersion nozzle to solidify. Ladle 10 is provided with a pair of the first ladle 11 and the second ladle 12, as shown in Figure 6, alternately receives the molten steel to be supplied to the tundish 20 alternately. In the tundish 20, the supply rate of the molten metal flowing into the mold 30 is controlled, the molten metal is distributed to each mold 30, the molten metal is stored, and the slag and the non-metallic inclusions are separated.

In the tundish 20, a certain amount of molten steel must be secured for constant injection of molten steel into the mold and separation of inclusions during the ladle exchange.

In the ladle exchange, as shown in FIG. 7, the amount of molten steel supplied to the tundish 20 is not provided, and the amount of molten steel exiting the mold is kept constant, thereby reducing the amount of molten steel in the tundish 20. If the temperature before the molten steel is injected into the mold is lower than the theoretical solidification of the molten steel, there is a high risk of freezing of the tundish sink surface and an operation accident. Therefore, temperature management of molten steel is very important and needs management. In general, the appropriate temperature in the tundish 20 is managed higher than the molten steel theoretical solidification temperature, and the temperature is managed approximately tens of degrees higher. However, the molten steel temperature of the ladle carried to the tundish 20 is not always constant, and the molten steel temperature in the ladle during the injection of the molten steel into the tundish 20 varies in temperature depending on the injection time. Therefore, it is important to monitor the molten steel temperature at all times during the playing operation.

On the other hand, the controller 150 receives the measurement data on the weight of the tundish 20 from the load cell 120, and compares the input tundish weight and the weight of the previous tundish stored in the storage unit 130 to turn It is determined whether the weight of the dish 20 is changed (S12, S13). Here, the controller 150 may consider that there is no change in weight when the change in the weight of the current tundish 20 and the change in the weight of the previous tundish is within a certain range. For example, if the amount of change in the weight of the current tundish 20 and the weight of the previous tundish is less than approximately 2% of the weight of the previous tundish, it may be considered that there is no change in weight. The tundish weight may be replaced by the amount of molten steel so that the amount of change may be calculated.

If the weight of the tundish 20 does not change, the controller 150 maintains the temperature measuring means 110 at the current temperature measuring position (S14). As shown in FIG. 7, the amount of molten steel of the tundish 20 is kept constant during normal casting, and a change occurs in the amount of molten steel of the tundish 20 from the end of the first ladle to the normal casting of the second ladle.

However, when the weight of the tundish 20 is changed, the controller 150 calculates the amount of molten steel in the tundish 20 according to the weight of the tundish 20. The amount of molten steel in the tundish 20 is obtained by subtracting the weight of the tundish itself from the measured weight of the tundish 20. Subsequently, the controller 150 calculates the molten steel level in the tundish 20 using the calculated molten steel amount (S15). The amount of molten steel x in the tundish 20 and the level of molten steel y are proportional to each other. Substituting the amount of molten steel x in the tundish 20 into a predetermined relation 1 (y = ax + b) The molten steel level y is obtained. Here, the relation coefficient a and the relation constant b are constant values that can be changed according to the shape and size of the tundish 20 and are not limited to specific values.

-y)에 대입하여 기준위치로부터의 상대적인 이동거리인 목표 측온위치(z)를 구한다. 상기에서 기준값인

는 용강의 최대레벨값일 수 있다. 아래 표 1은 턴디쉬 용강량과 용강레벨에 따른 측온수단(110)의 이동거리를 나타낸 것이다. When the molten steel level is calculated in the above, the controller 150 calculates the temperature measurement position which is a relative moving distance from the reference position according to the calculated molten steel level (S16). That is, the controller 150 calculates the molten steel level y obtained above from the predetermined relation 2 (z =).

-y) is used to find the target temperature measurement position (z), which is the relative distance from the reference position. In the above, the reference value

May be the maximum level of molten steel. Table 1 below shows the moving distance of the temperature measuring means 110 according to the tundish molten steel and the molten steel level.

Tundish Melt Flow [ton] Tundish molten steel level [mm] RTD (Movement Distance) [mm] 80 t 1250 0 (standard position) 70 t 1125 125 60 t 1000 250 50 t 875 375 40t 750 500

As shown in Table 1, as the amount of molten steel and the level of molten steel decrease, the temperature measuring means 110 will increase the moving distance from the reference position, that is, the temperature measuring position. The reference position is the position of the temperature measuring means 110 with respect to the maximum molten steel level during a normal playing process.

When the target temperature measurement position is obtained, the controller 150 controls the control valve 144 and the air pump 147 of the driving means 140 to vertically move the temperature measurement means 110 to the calculated temperature measurement position (S17). . When the controller 150 moves the temperature measuring means 110 to the target temperature measuring position, the controller 150 returns the temperature measuring means 110 to the reference position and then moves to the target temperature measuring position or the current stored in the target temperature measuring position and the storage 130. After the distance difference with the temperature measurement position is calculated, the temperature measurement means 110 may be moved to the target temperature measurement position by moving the temperature measurement means 110 by the corresponding distance difference. If the distance difference between the target temperature measurement position and the current temperature measurement position is a positive value, the immersion depth is increased (the temperature measurement means is lowered). If the distance difference is a negative value, the immersion depth is decreased (the temperature measurement means is increased). .

For example, as shown in Fig. 8, the initial position of the temperature measuring means 110 according to the normal molten steel level ① during the playing process is a point ⓐ (the reference position), and the temperature measured with respect to the previous molten steel level ② according to the ladle exchange. Assuming that the previous position of the means 110 is point ⓑ and the target position of the temperature measuring means 110 with respect to the current molten steel level ③ according to the measurement result is point ⓒ, the controller 150 controls the air volume sensor 145. By measuring the amount of air supplied to the pneumatic cylinder 141 through the position of the temperature measuring means 110, by controlling the control valve 144, by adjusting the amount of air supplied to the pneumatic cylinder 141, the temperature measuring means 110 It is possible to precisely control the moving distance and the temperature measurement position of). Here, the air amount and the moving distance of the pneumatic cylinder 141 is inversely proportional. That is, as the air amount of the pneumatic cylinder 141 increases, the temperature measuring means 110 rises to the reference position, and as the air amount decreases, the temperature decreases from the reference position to increase the moving distance.

The current position of the temperature measuring means 110 is determined by the length of the temperature measuring means 110 itself, the thickness of the support 143 supporting the temperature measuring means 110, the height of the pneumatic cylinder 141 itself, and the amount of air injected into the pneumatic cylinder 141. It can be seen by the displacement of the temperature measuring means 110 and the driving means 140. To this end, the displacement of the temperature measuring means 110 should be measured according to the unit air amount supplied to the pneumatic cylinder 141 in advance. For example, if the relationship between the amount of air and the moving distance between the temperature measuring means 110 is known, the current position and the moving distance of the temperature measuring means 110 may be accurately determined by sensing or adjusting the amount of injected air.

Therefore, in the present invention, instead of fixing the temperature measuring means 110 to the tundish cover 29, the movable means 140 connected to the pneumatic cylinder 141 to be movable in the vertical direction, the molten steel of the tundish 20 By raising or lowering the temperature measuring means 110 in accordance with the increase or decrease of the level, continuous molten steel temperature measurement is possible at a predetermined position from the hot water surface.

Such a molten steel temperature measuring system is not limited to the configuration and operation of the embodiments described above. The above embodiments may be configured such that various modifications may be made by selectively combining all or part of the embodiments.

10: ladle 15: shroud nozzle
20: Tundish 25: Immersion Nozzle
30: Mold 40: Mold oscillator
50: powder feeder 51: powder layer
60: support roll 65: spray
70: pinch roll 80: performance cast
81: Solidification shell 82: Non-solidified molten steel
90: Cutter 91: Cutting point
100: temperature measuring device 110: temperature measuring means
120: load cell 130: storage unit
140: driving means 141: pneumatic cylinder
142: rod 143: support
144: control valve 145: air volume sensor
146: air tank 147: air pump
150: controller

Claims (9)

Temperature measuring means for immersing in the molten steel of the tundish to measure the molten steel temperature;
A driving means installed and operated on the cover of the tundish and vertically adjusting the immersion depth of the temperature measuring means fixedly coupled; And
And a controller configured to calculate the amount of molten steel in the tundish according to the measured weight of the tundish, and to control the driving means such that the temperature measuring position of the temperature measuring means is varied according to the calculated amount of molten steel.
The controller calculates the molten steel level in the tundish using the calculated molten steel amount, calculates a target temperature measuring position which is a relative moving distance from the reference position according to the calculated molten steel level, and measures the temperature at the calculated target temperature measuring position. And continuously controlling the driving means such that the means is vertically moved, thereby controlling the temperature measurement of the molten steel while the temperature measuring means is continuously immersed in the molten steel.
delete The method according to claim 1,
And a storage unit for storing information about the weight of the tundish, the amount of molten steel, and the current temperature measurement position.
The method according to claim 1,
The drive means is a tungsten molten steel temperature measuring apparatus comprising a pneumatic cylinder or a hydraulic cylinder.
Immersing the temperature measuring means in the molten steel of the tundish;
Calculating the amount of molten steel using the weight of the tundish periodically measured after the immersion of the temperature measuring means;
Calculating a molten steel level in the tundish using the calculated molten steel amount;
Calculating a target temperature measurement position of the temperature measurement means which is a relative moving distance from the reference position according to the molten steel level calculated above; And
And moving the temperature measuring means to the target temperature measuring position calculated using the driving means.
The target temperature measuring position is a temperature measurement method in the molten steel that is a position to measure the temperature of the molten steel in the state that the temperature measuring means is continuously immersed in the molten steel even if the molten steel level changes.
delete The method according to claim 5,
The calculating of the amount of molten steel may be performed by comparing the current weight of the measured tundish with the previous weight of the last measured tundish, and calculating the molten amount using the current weight of the tundish measured above. When the temperature measuring means is moved, the vertical temperature is moved vertically by a distance corresponding to the distance difference between the current temperature measurement position and the target temperature measurement position according to the calculated molten steel level. The molten steel temperature measuring method in tundish to maintain the temperature measuring means in the current temperature measuring position if the same as the weight immediately before.

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