KR200180084Y1 - Slag blocking apparatus with blocking setting value compensation function in continous cast laddle - Google Patents

Abstract

The present invention is equipped with a cutoff set value compensation function to minimize the inflow of the ladle to the tundish by compensating for the weakening of the slag detection signal due to the current effect attached to the nozzle around the slag detection sensor due to the increased use of the ladle. A slag blocking device for playing ladle, the configuration of which is provided with a slag detection sensor around the inlet of the ladle, the slag blocking device of the playing ladle blocking the ladle inlet according to the detected slag value, the limit ratio to be blocked Standard slab containing the slag of and is inserted into the inlet of the ladle, and when the standard specimen is inserted into the inlet of the performance ladle, accumulate and store the output value of the slag detection sensor of the performance ladle by ladle number, A cutoff set value compensator for calculating a compensation value by subtracting the current detection value from the previous detection value; When set the output value of the sensor output exceeds the cut-off setting value is detected as compared to the correction by the calculated compensation value in the compensator minutes set point setting range is achieved by further comprising a control unit for controlling the slag off to block the entrance to the ladle.

Description

SLAG BLOCKING APPARATUS WITH BLOCKING SETTING VALUE COMPENSATION FUNCTION IN CONTINOUS CAST LADDLE}

The present invention relates to a reproducing process for producing slabs, blooms, or billets, which are semi-finished products of molten steel, which have been removed from the steelmaking process during the steelmaking process, and more specifically, supplying molten steel by tundish for product production. The present invention relates to a performance ladle slag blocking device having a cutoff set value compensation function for adjusting a break point by compensating for a change in a detection value according to the presence of a slag attached around an entrance when controlling slag blocking in a ladle.

Generally, as shown in FIG. 1, the performance equipment includes a ladle (LADDLE) 1, which is a facility for carrying molten steel withdrawn from the steelmaking process, and a ladle 1, which is carried, and performs a 360 degree turning motion. Two ladle turret arms (3), a tundish (7) which is a cushioning device for maintaining the temperature of the molten steel flowing from the ladle (1) and smoothing the flow of the flow rate, and the molten steel injected from the tundish (7) A torch cutting machine for cutting the mold 8 and the strand 9 and the solidified slabs having a predetermined shape by the mold 8 and the strand 9 to make slabs having a predetermined shape. 10).

However, since the molten steel contained in the ladle 1 is a state in which the slag 2, not the main component, is mixed in the upper portion, the slag 2 is prevented from entering the tundish 7 at the end of the inflow. Failure to do so will reduce the quality of the product.

Therefore, the slag 2 should be blocked from entering the tundish 7. In order to block the inflow of the slag 2, a cylindrical detection sensor is formed around the hole through which the molten steel at the lower part of the ladle 1 exits. (4) is installed, and when molten steel passes through the sensor 4 and enters the tundish 7, the electrical signal detected from the sensor 4 is periodically input through the signal input unit 11 to the control unit 13. The data is converted into data, and is compared with the slag cutoff setting value set in the operation instruction unit 12 of the cab before the operation. At this time, when the slag detection value reaches the set value, the control unit 13 transmits a command signal to close the ladle slide gate 5 to the signal output unit 14, and the ladle under the control of the signal output unit 14 The slide gate 5 is closed to block the introduction of slag.

As shown in FIG. 2, the slag detection sensor includes primary and secondary coils 15 and 16 separated therein, and when a constant current 17 flows through the primary coil 15, A magnetic field 19 is formed around the coil, and the induced magnetic force 18 is generated in the secondary coil 16 by the magnetic field 19. The induced electromotive force passes through the inside of the sensor (ie, molten steel). Or slag) by using the fact that the magnetic flux density varies depending on the slag). That is, when the molten steel is introduced, the magnetic flux density increases, and the molten steel containing slag has a lower magnetic flux density.

By the way, in general, continuous casting ladles are used in a number of ways, the molten steel from the steelmaking process to the ladle turret arm cast and then transferred to the ladle repair shop, the slag containing molten steel in the ladle After discharging the residual water, reassembling the slide gate at the bottom of the ladle, and preheated to a predetermined temperature or more, it is fed back into the steelmaking process to transport the next molten steel.

Typically, one ladle is used for several times, and once a regular repair point is reached, the ladle internal refractory brick is removed and then rebuilt and put into work. As described above, when used several times, the current is attached around the molten steel inlet in which the slag detection sensor is installed at the lower part of the ladle, and thus weakens the detection signal of the slag detection sensor, so that the set value for determining the slag blocking time should be lowered. That is, the ladle slide gate should be closed sooner to compensate for the weakening of the signal now attached.

By the way, as shown in Figure 3, the slag detection sensor as shown in Figure 3, the longer the use time of the ladle 1, the longer now 20 is attached around the nozzle 6, the sensor 4 is installed, the same, With respect to molten steel, the magnetic flux density generated at the time of attachment now is smaller than at the time of now not attached. Therefore, when it is used for a long time, as shown in the graph of FIG. 4, the electromotive force detection curve 22 at the time of attaching now is initially different from the electromotive force detection graph 21 at the time of not attaching now due to the weakening of the electrical signal. Appears, and the slag detection amount curve 25 at the time of attachment now exists below the curve 24 at the time of not currently attached.

Therefore, when the same amount of slag flows in, under the fixed set value, a time delay occurs by? T of the ladle slide gate, so that the slag flow cannot be blocked during that time.

As described above, since the reference value for determining the closing time of the ladle slide gate is conventionally set as a fixed value, the amount of slag inflow into the tundish actually increases gradually with time, and as a result, as time passes, There was a problem that the quality of the product is degraded.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and its object is to increase the use of the ladle, thereby compensating for the weakening of the slag detection signal due to the present effect attached to the nozzle surrounding the slag detection sensor, thereby turning in the ladle. It is to provide a performance ladle slag blocking device with a cutoff setpoint compensation function to minimize the inflow to the dish.

1 is a block diagram showing a general slag blocking device.

2 is a schematic view for explaining the slag detection principle in the slag blocking device.

Figure 3 is a schematic diagram showing the magnetic field change when the slag is attached to the sensor surroundings.

Figure 4 is a graph showing the change in electromotive force according to whether the slag is attached now.

5 is a block diagram illustrating a slag blocking device having a cutoff setpoint compensation function according to the present invention.

6 is a schematic process chart showing a process of inserting a standard specimen according to the present invention.

7 is a flowchart showing the operational flow of the apparatus according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: Ladle 2: Slag

3: ladle turret arm 4: slag detection sensor

5: Ladle Slide Gate

6: NOZZLE 7: TUNDISH

8: mold 9: strand

10: TORCH CUTTING MACHINE

11: signal input part 12: operation / instruction part

13 control unit 14 signal output unit

30: Block setting value correction

As a construction means for achieving the above object of the present invention, the present invention is provided with a slag detection sensor around the inlet of the ladle in the slag blocking device of the performance ladle to block the ladle inlet according to the detected slag value,

A standard specimen containing slag of a critical ratio to be blocked and inserted into the inlet of the ladle,

When the standard specimen is inserted into the inlet of the performance ladle, the output setting of the slag detection sensor of the performance ladle is stored for each ladle number, and the cutoff setting calculates a compensation value by subtracting the current detection value from the previous detection value. Value compensation unit,

And a slag cut-off control unit for blocking the ladle inlet when the detected value exceeds the set range by comparing the output value of the slag detection sensor with the set value corrected by the compensation calculated by the cutoff set value compensator. do.

Hereinafter, with reference to the accompanying drawings will be described the configuration and operation of the present invention.

Fig. 5 is a block diagram showing a performance ladle slag blocking device constructed according to the present invention, and means for injecting molten steel from the ladle 1 to the tundish 7 will be described with the same reference numerals. Standard specimens 28, which are inserted into the inlet of the ladle 1, in which molten steel is not contained when adjusting the blocking value, comprising molten steel and slag as a reference for determining the interruption time of the ladle slide gate 5 during An analog / digital converter 51 which receives the detection signal 29 from the slag detection sensor 4 and converts it into digital data, and the analog / digital converter 51 when the standard specimen 28 is inserted into the ladle 1; The digital conversion value of) is input to calculate the negative value of the electromotive force due to the influence of the current attachment by subtracting the previous measured value and subtracting the above decrease from the previous setting value to calculate the current value of the ladle. The detection signal from the slag detection sensor 4 mounted on the cutoff set value correction unit 30 for storing the call and the number of times of use and the ladle 1 for discharging the molten steel to the tundish 6 upon reaching the performance column The signal input unit 11 for digital conversion, the operation / instruction unit 12 which allows the driver to operate / instruct the performance of the performance on the performance column, and the ladle 1 currently arriving at the current column from the cutoff setting value correction unit 30. Reads the latest slag detection reference value and the correction setting value accordingly, resets the cutoff setting value and compares it with the current slag detection value input from the signal input unit 11 to compare the current slag detection value with 5) the driver controls the control unit 13 to control the closing, the signal output unit 14 which transmits the control signal of the control unit 13 to the corresponding driving device, and the determination result and the operation state of the control unit 13. To output It consists of an output unit 15.

6 shows an embodiment of the standard specimen inserting device, where 1 is a part of the ladle, 4 is a slag detection sensor mounted at the molten steel outlet of the ladle 1, and 5 is a molten steel outlet of the ladle 1. 6 is a nozzle connecting the molten steel outlet of the ladle 1 to the tundish, and 28 is a cylindrical cylinder made to contain the amount of slag as a reference for determining an optimal closing point in actual operation. 33 is a standard specimen guide device for inserting the standard specimen 28 into the molten steel outlet of the ladle 1, and 34 is a stopper device for uniformly occupying the standard specimen within the slag detection sensor 4 .

7 is a flowchart showing the operation of the apparatus according to the present invention in order.

First of all, the operation of the present invention will be briefly described. In order to change the slag cutoff setting value, it is necessary to know how much the slag detection value of the detection sensor is weakened due to the current effect in the state immediately before the ladle is put into the playing work. In view of this, the apparatus according to the present invention pre-fabricates a standard specimen containing molten steel and slag corresponding to the closing optimum time of the ladle slide gate, and measures the slag detection value of the slag detection sensor for the standard specimen. When the ladle containing the molten steel arrives at the performance when the ladle containing the molten steel arrives at the performance, the data is transferred to the slag control system just before the work is started to set a new set value, and the closing of the molten steel ladle slide gate at the optimal time is closed. Do it.

This will be described with reference to the accompanying drawings.

First, as shown in FIG. 5, when the ladle completed at the ladle repair station is removed, the ladle slide gate 6 is removed, and when the ladle lower molten steel inlet becomes an empty hole, the standard specimen 28 is placed inside the hole. To detect the output signal from the slag detection sensor 4. At this time, the standard specimen 28 is made into a cylindrical model by using analytical equipment so as to have a ratio of slag corresponding to the optimum closing point in actual operation.

Inserting this standard specimen 28 into the ladle 1 is as follows.

That is, as shown in Figure 6, the standard specimen inserting device is a measurement position or shaking in the state in which the ladle slide gate 5 and the nozzle 6 is attached in the same manner as the standard specimen 28 is actually performed A stopper device 34 is used to use the guide device 33 to maintain the signal measurement condition of the sensor and to equalize the occupancy distance A of the specimen inside the sensor.

The signal 29 of the slag detection sensor 4 detected in the state where the standard specimen 28 is inserted is input into the cutoff set value compensator 30, and the cutoff set value compensator 30 measures the last time. Calculate the value (N times reduction = Slag measurement value of standard specimen-N times standard slag measurement value of N times) of minus operation and minus operation and decrease corresponding to the electromotive force due to the present influence, and set N times. The value (N-1 times set value-N times reduced value) is calculated and stored in the database 30a so that the data can be inquired by ladle number and number of times of use.

And, when the repaired ladle takes the molten steel in the steelmaking process and arrives at the playing process, the operator inputs the number of the ladle arrived into the operation / instruction unit 12, the control unit 13 is the input ladle Using the number as a key, the cutoff value is read from the cutoff set value compensation unit 30 when the most recent standard specimen of the ladle is measured.

In this way, when the compensation data is transmitted from the cutoff set value compensation unit 30, the control unit 13 updates and sets the cutoff set value using the transmitted decrease value.

Then, when the work is started by opening the ladle slide gate 5, the slag blocking control control unit 13 compares the present slag detection value 31 detected by the slag detection sensor 4 with the updated set value. When the detected value is larger than the set value, the close signal 32 is transmitted to the signal output unit 14 to close the ladle slide gate 5.

Therefore, the blocking device according to the present invention can determine the breaking time by applying different setting values for all ladles, and also consider the change in the intensity of the sensor signal due to different working environment conditions as well as the effect of the current attachment. Therefore, when the slag of a predetermined range (slag amount corresponding to the standard specimen) is always introduced into the tundish, the ladle slide gate may be closed to block the inflow of the slag.

As described above, the slag inflow can always be blocked at the optimal time by changing the set value by compensating for the weakening of the detection signal by now attached to the slag detection sensor by repeated use of the ladle. There is an excellent effect, there is an excellent effect that can greatly contribute to the production of high-grade steel by suppressing the components of impurities contained in the product.

Claims (4)

In the slag blocking device of the performance ladle is provided with a slag detection sensor around the inlet of the ladle to block the ladle inlet in accordance with the detected slag value, A standard specimen containing slag of a critical ratio to be blocked and inserted into the inlet of the ladle, When the standard specimen is inserted at the entrance of the performance ladle, the output setting of the slag detection sensor of the performance ladle is stored by ladle number, and the cutoff setting calculates a compensation value by subtracting the current detection value from the previous detection value. Value compensation unit, And a slag cut-off control unit for blocking the ladle inlet when the detected value exceeds the set range by comparing the output value of the slag detection sensor with the set value corrected by the compensation calculated by the cutoff set value compensator. A performance ladle slag cutout device with a cutoff setpoint compensation function. The method of claim 1, wherein the standard specimen is a slab blocking slag play with a cutoff setpoint compensation function, characterized in that the cylindrical model is made by using the analysis equipment to have a ratio of the slag corresponding to the optimum closing point in the actual operation. Device The method of claim 1, wherein the cutoff setting value correction unit When the standard specimen is inserted into the ladle, the measured value of the slag detection sensor is negatively calculated from the previous measured value to obtain a decrease in electromotive force due to the effect of the current attachment, and subtract the decrease from the previous slag cutoff setting value. A performance ladle slag blocking device having a cutoff setpoint compensation function, which is calculated according to a setpoint value and stored according to the number of ladles and the number of times the ladle is used. The method of claim 1, wherein the insertion of the standard specimen is performed every time the ladle is completed at the ladle repair shop, and after removing the ladle slide gate, the ladle lower molten steel injection hole is made into an empty hole. Performance ladle slag blocker with setpoint compensation.