JP2002371309A - Method and device for receiving pig iron - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for receiving pig iron, which safely and surely perform such an operation that a pan-type car receives molten pig iron tapped out from a blast furnace, through a lopsided flume. SOLUTION: This method for receiving pig iron is characterized by finishing pig-receiving (S29), and starting the next pig-receiving, when having judged that the quantity of the received pig iron is not excessive, from an elapsed time T starting from a pig-receiving time (YES at S21), that it reaches a predetermined quantity, from a value Yk which is obtained by reducing an error from an observed value for a surface level of the molten metal with a predetermined method (YES at S25), that the quantity of the received pig iron is not too few, from an elapsed time T (YES at S26), and that the surface level of the molten metal does not excessively fluctuate, from the changing quantity U for the observed values (YES at S28).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for receiving molten iron from a blast furnace through a tilting gutter to a ladle.

[0002]

2. Description of the Related Art Generally, hot metal from a blast furnace is received by a ladle and transported to an iron making facility. A pig iron receiving device for receiving hot metal by a ladle comprises a tilting gutter having a hot metal outlet on both sides and a driving device for the tilting gutter, and the hot metal discharged from the blast furnace is, for example, via a main gutter, the tilting gutter. It is led to. The inclined gutter makes the ladle placed below one of the hot metal outlets accept hot metal by being inclined in one direction. When the molten iron received by the ladle reaches a predetermined amount, the tilting gutter is tilted to terminate the ladle reception. Next, the tilting gutter is inclined in the other direction so that the ladle placed under the other hot metal outlet receives the hot metal. The iron pan is transported to the iron making facility under the control of the transport system, and the empty pan wheel is moved from the iron making facility to the pig iron receiving apparatus, and the pan wheel repeatedly receives the pig iron again.

[0003] In the case of using a conventional iron receiving device, an operator
Visually confirm that the level of the ladle during the iron receiving operation and that the empty ladle is waiting at the predetermined position, and when the pan wheel has received the iron to the predetermined level, the drive device of the inclined gutter is turned off. Then, the tilting gutter is tilted to terminate the pig iron receiving operation. For this reason, when the iron casting of the pan wheel is finished in a state where the molten metal level is excessively lower than a predetermined level due to an operator's error or an error due to visual inspection, the amount of pig iron carried by the pan wheel decreases and the rotation of the pan wheel When the efficiency is deteriorated, and when the pig iron receiving operation is finished in an excessively higher state than a predetermined value, for example, the molten iron overflows from the cooking wheel and a serious accident may occur. In addition, an accident due to an erroneous operation of the control device may occur. Furthermore, the pig receiving workplace is in a high temperature state, and the work environment is not good.

In view of such circumstances, Japanese Patent Application Laid-Open No. 5-125
JP 413, JP-A-6-88679 and JP-A-6-273071 disclose an automated pig receiving apparatus. The iron receiving device is a level meter for measuring the level of the hot metal in the ladle, a weight scale for measuring the weight of the ladle,
And a control device for a ditch gutter drive device. The control device controls the drive device to tilt the ditch gutter when the measured value of the level meter or the weighing scale reaches a predetermined value, whereby the worker In this way, it is possible to prevent the checking of the molten metal level, the error due to the visual measurement, the erroneous operation of the control device, and the like, so that the iron receiving operation can be performed safely and reliably. Furthermore, in the case of adding the photographing / imaging means to the pig iron receiving device, the worker can check the level of the molten metal and the standby state of the ladle at a place remote from the pig iron receiving workplace, so that it is safer and more reliable. Work can be done.

[0005]

However, the conventional pig iron receiving apparatus is provided with a level meter for measuring the level of the molten metal and a weight meter for measuring the weight of the ladle, and in some cases also with photographing and image means. The configuration is complicated. Also, load cells used as weigh scales are expensive. Also, the actual measurement value signal sent from the level meter may temporarily become high or low due to chattering (vibration of the actually measured value of the level meter) or forming (foaming of the molten metal surface). Instead, in the case of configuring the pig iron receiving apparatus using only a level meter, as in the related art, when the actually measured value of the level meter reaches a predetermined value, the driving device is controlled to tilt the decanter gutter. In such a case, the predetermined amount cannot be reliably received.

The present invention has been made in view of the above circumstances, and measures the level of molten metal in a ladle, calculates a calculated value with a reduced error in the measured value, and calculates the elapsed time from the start of the receiving operation. By measuring the measured time and tilting the inclined gutter based on the calculated value, without using an expensive load cell, it is possible to safely and reliably receive a predetermined amount of hot metal in a ladle. It is an object of the present invention to provide an acceptable pig iron receiving method. Another object of the present invention is to calculate a calculated value by using a predetermined coefficient and a relational expression between the actually measured value and the previous calculated value, thereby using the calculated value in which the error of the actually measured value is reduced, to obtain a predetermined amount. It is an object of the present invention to provide a pig iron receiving method that can surely perform pig iron receiving. Another object of the present invention is to calculate the calculated value by the relational expression between the current measured value and the measured value up to n times before (n is a natural number), so that the coefficient for reducing the error is not determined in advance. Another object of the present invention is to provide a pig iron receiving method that can reliably perform a predetermined amount of pig iron using a calculated value in which an error in an actually measured value is reduced.

Still another object of the present invention is to calculate a calculated value by using an actually measured value of a level meter, measure an elapsed time from the start of pig iron receiving, and use the elapsed time and the calculated value to tilt a ditch gutter. It is an object of the present invention to provide a pig iron receiving device that can safely and reliably receive a predetermined amount of hot metal in a ladle without using an expensive load cell.

[0008]

According to a first aspect of the present invention, there is provided a pig iron receiving method in which molten iron from a blast furnace is received by a pan wheel by inclining a tilting gutter in one direction and then by another pan wheel. In order to receive the pig, in the pig receiving method of inclining the inclined pouring gutter in the other direction, the elapsed time from the start of the receiving of the ladle is measured, and the elapsed time is equal to or longer than a maximum time of a predetermined time width. Determine whether or not, if the above longest time or more, issue an alarm,
In addition, the molten metal level of the hot metal in the ladle is measured, the measured value of the molten metal level is calculated in a time series with a calculated value in which the error of the measured value is reduced using a predetermined error reduction method, If the elapsed time is less than the maximum time, determine whether the calculated value is equal to or greater than a predetermined threshold, if less than the threshold, continue pig iron, if greater than the threshold, ,
It is determined whether or not the elapsed time is equal to or longer than the shortest time of the time width, and whether or not a change amount of the calculated value from a previous calculated value is within a predetermined range. In the case where the elapsed time is less than the shortest time or the amount of change exceeds the range, an alarm is issued,
In the case where the elapsed time is equal to or longer than the minimum time and the amount of change is within the range, the starting of pig iron of another ladle is started.

In the first invention, when the elapsed time from the start of the receiving of the ladle during the receiving of the iron reaches a predetermined maximum time or more, the amount of the received iron has already reached the predetermined amount. That
An alarm that is not detected due to erroneous detection or failure of the level meter and judges that there is a possibility that hot metal of a predetermined amount or more has been received in the ladle and is in a dangerous state, and alerts the worker Emits. If the elapsed time is less than the longest time and the calculated value is less than the threshold value, it is determined that the hot metal in the ladle has not reached the predetermined amount, and the receiving of the hot metal is continued. When the elapsed time is less than the longest time and the calculated value reaches the threshold or more, it is determined that the hot metal in the ladle has reached the predetermined amount, and the tilting gutter is tilted to receive the pig iron of another ladle. To start, even if the calculated value has reached the threshold or more, if the elapsed time has not reached the minimum time or more, the result that can be determined from the calculated value (it has reached the predetermined amount) and the result that can be determined from the elapsed time (Not arrived at the specified amount), the level meter erroneously detected,
Alternatively, it is determined that there is a possibility that a failure or the like has occurred, or that there has been a mistake in setting the threshold value, the minimum time, or the like, and an alarm is issued to the worker. Further, even when the calculated value reaches the threshold, if the amount of change in the calculated value exceeds the allowable range, it is determined that there is a possibility that an erroneous detection of the level meter or a failure has occurred. Raise an alarm. When an alarm is issued, for example, the operator can visually check the receiving state and manually operate the drive device of the inclined gutter, or can take measures such as stopping tapping from the blast furnace, etc. It is possible to safely and reliably receive a predetermined amount of hot metal on a ladle,
Further, excessive and insufficient iron receiving can be prevented.

[0010] The longest time is an elapsed time from the start of the hot-rolling, in which the amount of hot metal in the ladle should reach a predetermined amount at the latest at the latest, and the shortest time is at the earliest at that time. The longest time and the shortest time are the elapsed time from the start of receiving iron when the amount of hot metal in the ladle should not reach the predetermined amount, and the relationship between the tapping speed from the blast furnace and the capacity of the ladle that can be roughly grasped And can be determined based on past operation results, but can also be determined in consideration of safety. In addition, the range of the change amount, the relationship between the tapping speed and the measurement level of the molten metal level and the past operation results,
It can be determined in consideration of safety or workability. In addition, the ranges of the longest time, the shortest time, and the amount of change can be set at an initially safe level, and can be adjusted to more optimal values based on subsequent operation results.

In a pig iron receiving method according to a second aspect of the present invention, in the error reducing method, the calculated value Y _k is calculated by using the measured value X _k , the number of times k measured, the previous calculated value Y _k−1 , and a predetermined coefficient. α (0 <
α <1) and the equation of Y _k = αX _k + (1−α) Y _k−1 is calculated.

In the second invention, the level of the molten metal when the hot metal in the ladle reaches a predetermined amount is defined as a threshold value D of the calculated value,
For example, Y ₀ = X ₁ and Y _k = αX _k + (1−α) Y
Using the equation of _k-1 = α (X _k −Y _k−1 ) + Y _k−1 , the current level is changed to the previous level, the current level and the previous level are calculated. difference, i.e. believe that by adding the change amount of the molten metal surface level, by adjusting the degree of change by a factor alpha, to reduce the error of the measured value, the hot metal of the pot interior when Y _k ≧ D given It is determined that the amount of received pig iron has been reached, and it is possible to reliably perform the receiving of a predetermined amount of iron using the calculated value in which the error of the actually measured value is reduced. If the coefficient α is too close to 1, the calculated value and the actually measured value become substantially equal, and Y _k ≧ D may be satisfied even if the actual molten metal level is less than D. If the coefficient α is too close to 0, the current calculated value and the previous calculated value are substantially equal, and Y _k <D may be satisfied even if the actual molten metal level is D or more. Therefore, when the value of α is optimized, for example, by repeating experiments in advance, the amount of change can be adjusted by the coefficient α to reduce errors.

[0013] In the pig iron receiving method according to a third aspect of the present invention, in the error reducing method, the calculated value Y _k is calculated by using the measured value X _k , the measured number k, the natural number n, and the measured value X _kn n times before. , Y _k
= ( _Xk + _Xk-1 + _Xk-2 + ... + _Xkn ) / (n + 1)
The calculation is performed using the following equation.

[0014] In the third invention, the hot metal in the ladle is set to a predetermined value.
The level of the molten metal when it reaches the amount is set as a threshold value D of the calculated value,
When kn ≦ 0, for example, X_kn= X_kAnd put
And Y _k= (X_k+ X_k-1+ X_k-2+ ... + X_kn) /
Calculate the average of n measured values using the formula (n + 1)
To reduce the error, and Y_kWhen ≧ D, the hot metal in the ladle is specified
Error in the measured values to determine that the
It is possible to reduce the amount of iron and to reliably receive a predetermined amount of iron. Ma
Calculating the calculated value using the actually measured values up to n times before
As a result, the calculated value becomes smaller than the actual level of the molten metal.
In this case, the calculated value is calculated from the time when the actual bath level becomes D or more.
Is sometimes delayed, the threshold D
Is the surface level when the hot metal in the ladle reaches a predetermined amount.
By setting the value slightly smaller,
It can be done reliably.

A pig iron receiving apparatus according to a fourth aspect of the present invention has a hot metal outlet on both sides, and inclines in one direction so that hot metal produced by a blast furnace is fed to a ladle placed under one of the hot metal outlets. In a pig receiving apparatus comprising: a tilting gutter to be tilted, and tilting gutter tilting means for tilting the tilting gutter so as to tilt in the other direction, so that the molten iron is received by a ladle placed under the other hot metal outlet. A level meter for measuring the level of the hot metal in the ladle; calculating means for forming the measured value of the level meter into a calculated value obtained by reducing the error of the measured value using a predetermined error reduction method; and Time counting means for measuring the elapsed time from the start of pig iron receiving, means for determining whether or not to issue an alarm using the elapsed time and the calculated value, and issuing an alarm when it is determined that an alarm should be issued Means and terminating the ironing of the pan wheel if no alarm is given Means for judging whether or not, and when judging to be finished, means for controlling the tilting gutter tilting means to tilt the tilting gutter so as to tilt in another direction, and to start pig iron receiving of another pan wheel. It is characterized by the following.

According to a fourth aspect of the present invention, there is provided an arithmetic means for obtaining a calculated value obtained by reducing an error of the actually measured value by using an actually measured value of a level meter, and a time measuring means for measuring an elapsed time from the start of pig iron receiving of the ladle. And, using the elapsed time and the calculated value, the termination or continuation of the pig iron, or determination means to determine an error, and a warning to the operator based on the determination result, or means to tilt the inclined gutter Can be configured as a control unit and connected to a level gauge and a tilting gutter tilting means, so that a ladle can safely and reliably receive a predetermined amount of hot metal without using an expensive load cell. And the structure of the device is simple.

[0017] The controller may be configured to perform the operation when the tilting gutter inclined in one direction is receiving the pig iron by the pan wheel and the determining means determines that there is a possibility of an error. Means to warn the person to warn the person, and when the determining means determines the end of the pig iron, means for tilting the inclined pouring gutter so as to incline in the other direction and let the other pan wheel accept the pig iron, When there is no alarm to the worker and when the end of the pig iron is not to be provided, means for continuing the pig iron are provided, so that it is not necessary to manually drive the tilting gutter tilting means every time the worker performs the pig iron,
It is possible to prevent an accident caused by an operator's mistake, and to further improve work safety. Further, by using the method for receiving an iron according to any one of the first to fourth inventions, it is possible to safely and reliably receive a predetermined amount of hot metal on a ladle, and to avoid excessive receiving. Since it is possible to prevent pig iron and too little pig receiving, the pig receiving operation can be automated.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments. FIG. 1 is a schematic front view of a pig receiving apparatus according to the present invention, FIG. 2 is a schematic side view of the pig receiving apparatus, and FIG. 3 is a schematic horizontal sectional view of the pig receiving apparatus. In the figure, reference numeral 1 denotes a blast furnace, and a main gutter 2 extending so as to guide the hot metal 10 from which the blast furnace 1 taps to the inclined gutter 4 has an inlet and an outlet at both ends in the longitudinal direction. Is provided near the bottom of the blast furnace 1, and an inclined gutter 4 is provided below the outlet. The inclined gutter 4 is installed with the direction intersecting with the longitudinal direction of the main gutter 2 as a longitudinal direction, has hot metal outlets on both sides in the longitudinal direction, and has a receiving gutter 4 below each hot metal outlet. Conveyance paths 6, 6 are laid from the pig workplace to the steelmaking equipment (not shown). On each transport path 6, a plurality of pan wheels 5, 5,... Are movably mounted along the transport path 6 such that the pan wheel 5 to receive the iron is located immediately below the melting outlet.

In the vicinity of each hot metal outlet of the inclined pouring gutter 4, a level gauge 3 for measuring the level of the molten metal of the ladle 5 during the receiving of the hot metal is installed.
The level meters 3 and 3 output the measured values of the molten metal level as electric signals to the control unit 8 via the LAN 11a in order to transmit the measured values to the control unit 8 installed in the control room 7 remote from the pig receiving work place. Connected. In addition, a drive device 9 is provided below the inclined gutter 4 to incline the inclined gutter 4 to one or the other. The driving device 9 is connected to the control unit 8 via the LAN 11b so as to receive a control signal from the control unit 8, and tilts the decanter gutter 4 according to the control signal. When the control signal is the pig receiving start signal, the tilting gutter 4 is tilted so as to tilt to one side. If the control signal is a pig ironing end signal, the tilting gutter 4 is tilted so as to tilt to the other.

FIG. 4 is a block diagram of the control unit 8 of the pig receiving apparatus. In the figure, reference numeral 81 denotes a CPU of the control unit 8 using a personal computer.
0, a timing section 82, a display section 83, an operation section 84, RA
M85, hard disk (HDD) 86, receiving unit 87,
It is connected to a transmission unit 88 and a buzzer 89, respectively, and controls each unit of the apparatus according to a control program stored in a hard disk 86. The timer 82 is a clock built in the personal computer, and measures the elapsed time from the start of the pig iron receiving. The display unit 83 is a display, which is controlled by the CPU 81 and displays an input instruction of a parameter to be set or a current value of the parameter. An operation unit 84 is a keyboard and a mouse. The operator operates the operation unit 84 while watching, and inputs, for example, the parameters using a numeric keypad and the start of pig iron using a function key.

The RAM 85 is a memory for temporarily storing various data during execution of the pig ironing operation, and stores, for example, parameters input by the user from the operation unit 84 before starting the pig iron receiving operation. The receiving section 87 and the transmitting section 88 are a receiving circuit and a transmitting circuit having an input / output interface, and the receiving section 87 transmits the hot water transmitted from the level meter 3 that measures the hot water level of the ladle during the pig iron receiving operation. The transmission unit 88 receives the measured value of the plane level via the LAN 11 a and sends a control signal to the driving device 9 to tilt the incline gutter 4 to the LAN 1 a.
1b. The buzzer 89 issues an alarm to notify the worker of the error and call attention.

The CPU 81 converts the received measured value of the level meter 3 into a calculated value in which the error of the measured value is reduced by using a digital filter described later, and calculates the calculated value in time series. Next, using the elapsed time measured by the timer 82, the parameter, and the calculated value, the termination or continuation of the pig iron or an error is determined, and the tilting gutter 4 is tilted based on the determined result. Send a control signal for
An alarm is issued using the buzzer 89. As the control signal, a predetermined signal suitable for the driving device 9 is stored in the hard disk 86 in advance. At this time, a threshold value of the calculated value, the longest time and the shortest time of the elapsed time, the allowable range of the change amount of the calculated value (the difference between the current calculated value and the previous calculated value), and the coefficient α are used as the parameters. The coefficient α is a smoothing factor of the digital filter, and is obtained in advance by repeating a pig receiving experiment.

The above-mentioned pig iron receiving apparatus includes a level meter 3 and
Since the control of the pig iron is performed using the timer 82 of the control unit 8, the configuration is simpler than that of a conventional pig receiving apparatus that controls the pig iron by using a level meter and a weighing scale in combination, and Since the personal computer used as the control unit 8 generally has a timekeeping function, there is no need to prepare a new clock as the timekeeping unit. Furthermore, since the control unit 8 is installed in the control room 7 remote from the pig receiving work place, when the worker performs work using the control unit 8, it is not necessary to perform the work in the hot work place. Work environment can be improved.

FIG. 5 is an explanatory diagram of the threshold value of the calculated value and the shortest time of the elapsed time used in the pig iron receiving method according to the present invention, and FIG.
It is explanatory drawing of the longest time of the elapsed time used by the said pig iron receiving method. The horizontal axis of the graph is the elapsed time T, and the vertical axis is the molten metal level L. T = 0 is the start of receiving iron, and L increases as T increases. When the ladle 5 receives a predetermined amount of hot metal 10, the molten metal level of the ladle 5 is D. Since the actual measurement value measured by the level meter 3 is a value including an error, D is a threshold value of the calculated value in which the error is reduced. Hot metal 10 is tapped from the blast furnace 1 at predetermined time intervals, but the flow rate at each tapping may fluctuate.
Previously obtained the minimum time S ₁ and the maximum time S ₂ until受銑a. When the elapsed time T is equal to or longer than the longest time S ₂ , the fact that the level of the molten metal has already reached the predetermined value D is not detected due to erroneous detection or failure of the level meter, and excessive hot metal is put on the pot wheel 5. It is determined that there is a possibility that the operation has been performed, and an error is issued to the operator and an alarm is issued to call attention (in the case of FIG. 6). Further, the elapsed time T when the calculated value is less than the maximum time S ₂ is less than the threshold D,受銑amount of pot wheel 5 is determined to be too small, to continue the受銑(case of FIG. 5) .

FIG. 7 is an explanatory diagram of the permissible range of the variation of the calculated value used in the pig iron receiving method. The horizontal axis of the graph is the elapsed time T, and the vertical axis is the molten metal level L. T = 0 is the start of receiving iron, and L increases as T increases. The optimum value of the difference between the current calculation value and the previous calculation value, that is, the allowable range H of the change amount U of the calculation amount is obtained in advance by repeating an experiment, for example. When the elapsed time T is less than the longest time S ₂ and the calculated value is equal to or greater than the threshold D, the change amount U of the calculated value
Exceeds the permissible range H, for example, it is determined that the level meter may have performed a serious erroneous detection, and an alarm is issued to notify the operator of the error. When the calculated value is equal to or larger than the threshold value D, the elapsed time T is equal to the shortest time S.
_{If the} value is less than ₁ , the result determined from the calculated value (greater than the level G) and the result determined from the elapsed time (less than the level D) are inconsistent. It determines that there is a possibility and issues an alarm to notify an error. Further, if the elapsed time T is calculated value be less than the maximum time S ₂ is the threshold value D or more, and the change amount U calculated value is within the allowable range H, the elapsed time T is the shortest time S ₁ or more At this time, the pan wheel 5 determines that the predetermined amount of hot metal 10 has been received, ends the receiving of the pan wheel 5, and then
The pig iron of the other ladle 5 is started.

FIGS. 8 and 9 show the control unit 8 of the pig receiving apparatus.
6 is a flowchart showing a control procedure of the driving device 9 according to the first embodiment. The control unit 8 receives the start of the pig iron receiving operation. CPU
81 displays a necessary operation procedure on the display unit 83, inputs parameters to the operator using the operation unit 84, and then starts the receiving operation of the pot wheel 5 located below one of the hot metal outlets. Is input (S10). In this case the user, according to the display of the display unit 83, a threshold D of the calculated value, shortest elapsed time T time S ₁ and the maximum time S _2, and the allowable input range H of variation U, and the coefficients alpha, then receiving Enter the pig start. The CPU 81 of the control unit 8 receives the input parameters and stores them in the RAM 85 (S1).
1).

Next, the CPU 81 determines whether or not the start of pig iron receiving has been input (S12). If not input (NO in S12), the process stands by until input. If it has been input (YES in S12), it reads the pigeon start signal from the hard disk 86 and transmits it to the driving device 9 via the transmission unit 88 (S13). At this time, the driving device 9
The tilting gutter 4 is tilted so that the tilting gutter 4 tilts to one side. Hot metal 10 that has been tapped from the blast furnace 1 is supplied to the inclined gutter 4 through the main gutter 2. Since the incline gutter 4 is inclined to one side, the ladle 5 located below one of the hot metal outlets is
Receive pig iron. Next, the CPU 81 initializes the elapsed time T and the change amount U of the calculated value, and stores in the RAM 85 T = 0, U
= 0 and k = 1 are stored (S14). Since the pig iron receiving operation has been started, the level meter 3 measures the level of the hot water of the ladle 5 at predetermined time intervals, and transmits the measured value to the control unit 8.

[0028] Next, CPU 81, via the receiving unit 87 receives the measured values X _k (S15), and stores and the measured values X _k and the elapsed time T timer unit 82 is measured in RAM 85 (S16 ). CPU81 determines whether the elapsed time T is less than the maximum time _{S 2, (S21), (} NO at S21) S ₂ it can be advantageously is likely to pan vehicle 5 becomes受銑excessive Then, an alarm is issued using the buzzer 89 in order to notify the operator of the error and call attention (S22).

If the elapsed time T is less than the longest time S ₂ (YES in S 21), the calculated value Y _k is calculated using the digital filter Y _k = αX _k + (1−α) Y _k−1. hand,
It is stored in the RAM 85. When k = 1, X ₁ is substituted for Y _k−1 , that is, Y ₀ (S24). It is determined whether or not the calculated value _Yk is equal to or greater than the threshold value D (S25). If the calculated value _Yk is less than D (NO in S25), it is determined that the ladle 5 is not receiving enough iron so that the receiving of iron is continued, k = k + 1 to be stored in the RAM 85 (S30), returns to S15, receives the measured values X _k from the level meter 3.

When the calculated value _Yk is equal to or larger than the threshold value D (S2
5 YES), the elapsed time T is determined whether a minimum time S ₁ or more (S26), if it is less than S ₁ (S2
6), a contradiction that it is possible to judge that a predetermined amount of hot metal 10 has been received from the calculated value, but that it is possible to judge that the hot metal is too low from the elapsed time occurs. When it is determined that the error has occurred or that there is a possibility that the setting of the threshold value, the longest time, the shortest time, or the like may have been mistaken, an alarm is issued using the buzzer 89 in S22 to call attention to the worker. .

[0031] (YES at S26) the elapsed time T may be the shortest time S ₁ or more, calculated value Y _k and the difference between the previous Y _k-1,
That is, the amount of change U = Y _k −Y _k−1 of the calculated value is calculated, and RA
M85 (S27), and the absolute value | U |
Is within the allowable range H (S28). H
Is exceeded (NO in S28), since the amount of change in the calculated value is excessive, it is determined that there is a possibility of an error due to erroneous detection or failure of the level meter. In order to call attention to, an alarm is issued using a buzzer 89.

When the absolute value | U | of the change amount U is within the allowable range H (YES in S28), it is determined that the ladle 5 has received a predetermined amount of hot metal 10, and the hard disk 86 receives a hot metal end signal. Is read and transmitted to the driving device 9 (S2
9) Return to S14 to perform initialization for the next pig iron receiving.
At this time, the drive device 9 tilts the tilting gutter 4 so that the tilting gutter 4 tilts to the other side. Hot metal 10 supplied to the inclined gutter 4
Is received by the ladle 5 located below the other hot metal outlet because the inclined gutter 4 is inclined to the other.

The above-described pig iron receiving method includes a calculated value obtained by reducing the error of the actually measured level of the molten metal level measured by the level meter 3,
Since the pig iron is controlled using the elapsed time measured by the timer unit 82 of the control unit 8, the pig iron mistake or accident due to the error of the actually measured value is prevented, and the pig iron work is performed reliably and safely. be able to. In addition, instead of the digital filter,
Y _k = (X _k +
X _k−1 + X _k−2 +... + X _kn ) / (n + 1) (k−
Even when X _kn = X _k ) when n ≦ 0 is used,
Similar effects can be obtained. For example, when calculating the average value of five measured values, Y _k = (X _k + X _k−1 + X _k−2) using the current measured value and the measured values up to four times before.
+ X _k-3 + X _k-4 ) / 5. Further, a configuration may be adopted in which different parameters are input for each pot wheel 5.

FIG. 10 is a graph showing the relationship between the elapsed time and the actually measured or calculated value when the driving device 9 is controlled using the pig iron receiving method according to the present invention. The horizontal axis is the elapsed time T (m
s), the vertical axis is the level of the molten metal L (m), and from the actually measured values measured every 100 ms when the iron pan 5 having a depth of 5 m was received and α = 0. 3 is plotted with the calculated value calculated using the digital filter. Found begins to vibrate significantly from the time of exceeding the L = 3, but exceeds the threshold value D in _{T = T 1, T = T} 1 is large vibration after, T = T ₁ through T mean value between ₂ Is smaller than the threshold value D. Further, the average value is seen to exceed the threshold value D to T = T ₂ later. Calculating values begin to vibrate and exceeds L = 3, the amplitude is small, be less than the threshold value even beyond T = T ₁ D, it is found to exceed the threshold value D in T = T _2. From the figure, it can be seen that the calculated value has a smaller amplitude than the actually measured value and indicates an average value of the level of the molten metal.

In the case where the photographing / video means is added to the pig receiving apparatus so that the worker monitors the situation of the pig receiving workplace from the control room, the reliability and safety of the work are further improved. can do. In addition, when a weight scale is added to the iron receiving device and the weight of the ladle is also used for control, it is possible to more accurately measure the amount of received iron and receive the iron.

[0036]

According to the pig iron receiving method of the present invention, the level of the hot metal in the ladle is measured, the calculated value in which the error of the measured value is reduced is calculated, and the elapsed time from the start of the pig iron is measured. By tilting the inclined gutter based on the measurement time and the calculated value, for example, the worker can adjust the molten metal level in the ladle to the molten metal level when the molten metal reaches a predetermined amount, and from the start of receiving iron to the molten metal level. The longest time and the shortest time to reach, and the amount of change that the measured value of the level meter fluctuates when chattering or forming occurs and when it does not occur are determined in advance by repeating experiments, and Considering the performance or safety, the level of the molten metal is set as a threshold value of the calculated value, and the allowable maximum range of the change amount is defined as the difference between the current calculated value and the previous calculated value, that is, the change of the calculated value. Make the amount acceptable.

When the elapsed time from the start of the pig iron receiving operation has reached the maximum time or longer, an alarm is issued to alert the worker. If the elapsed time is less than the longest time and the calculated value is less than the threshold, the pig iron is continued. If the elapsed time is less than the longest time and the calculated value reaches or exceeds the threshold value, the tilting gutter is tilted to start receiving iron from another ladle, but when the calculated value reaches or exceeds the threshold value. However, if the elapsed time has not reached the minimum time or more, a warning is issued to the worker. Further, even if the calculated value reaches the threshold, if the amount of change in the calculated value exceeds the allowable range, a warning is issued to the worker. As described above, a predetermined amount of hot metal can be safely and reliably received by the ladle, and further, excessive and insufficient iron receiving can be prevented.

Further, the calculated value is calculated by a relational expression between the actually measured value and the previous calculated value using a predetermined coefficient, so that the level of the molten metal when the hot metal in the ladle reaches the predetermined amount is calculated. , For example, Y ₀ = X ₁ and Y _k = αX
Using the formula of _k + (1−α) Y _k−1 = α (X _k −Y _k−1 ) + Y _k−1 , the current level is changed to the previous level, and the current level is set. Assuming that the difference between the level and the previous level, that is, the amount of change in the level is added, the amount of change is adjusted by the coefficient α to reduce the error in the measured value, and Y _k ≧ D At this time, it is determined that the hot metal in the ladle has reached the predetermined amount of received iron, so that the predetermined amount of iron can be reliably received using the calculated value in which the error of the measured value is reduced. When the value of α is optimized by, for example, repeating experiments in advance, the amount of change can be adjusted by the coefficient α to reduce errors.

The calculated value is calculated by the relational expression between the current measured value and the measured value up to n times before, so that the level of the molten metal when the hot metal in the ladle reaches a predetermined amount is calculated. The threshold value is D, and when _kn ≦ 0, for example, X _kn = X
_k, and Y _k = (X _k + X _k-1 + X _k-2 + ... + X
_kn ) / (n + 1) is used to calculate the average value of the measured values for n times to reduce the error, and when Y _k ≧ D, it is determined that the hot metal in the ladle has reached the predetermined amount of received iron. Therefore, even if a coefficient for reducing the error is not determined in advance, it is possible to reliably perform the receiving of a predetermined amount of iron using the calculated value in which the error of the actually measured value is reduced.

According to the pig iron receiving apparatus of the present invention, the calculated value is obtained by using the actually measured value of the level gauge, the elapsed time from the start of the pig iron receiving is measured, and the elapsed time and the calculated value are used to determine the inclination of the inclined gutter. By providing a means for controlling the tilting, a calculation means for obtaining a calculated value by reducing the error of the measured value using the measured value of the level meter, and a time measuring means for measuring the elapsed time from the start of the pig iron receiving of the pan wheel Using the elapsed time and the calculated value, a determination means to determine the end or continuation of the pig iron, or an error, and a warning to the operator based on the determination result, or means to tilt the inclined gutter Since it can be configured as a control unit and can be connected to a level gauge and a tilting gutter tilting means, it is possible to safely and reliably receive a predetermined amount of hot metal in a ladle without using an expensive load cell. And the structure of the device is simple Such that, the present invention provides excellent effects.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a pig receiving apparatus according to the present invention.

FIG. 2 is a schematic side view of the pig receiving apparatus according to the present invention.

FIG. 3 is a schematic horizontal sectional view of the pig receiving apparatus according to the present invention.

FIG. 4 is a block diagram of a control unit of the pig iron receiving apparatus according to the present invention.

FIG. 5 is an explanatory diagram of a threshold value of a calculated value used in the pig receiving method according to the present invention and a shortest time of an elapsed time.

FIG. 6 is an explanatory diagram of the longest elapsed time used in the pig iron receiving method according to the present invention.

FIG. 7 is an explanatory diagram of an allowable range of a change amount of a calculated value used in the pig iron receiving method according to the present invention.

FIG. 8 is a flowchart showing a control procedure of a drive unit by a control unit of the pig receiving apparatus according to the present invention.

FIG. 9 is a flowchart showing a control procedure of a drive unit by a control unit of the pig receiving apparatus according to the present invention.

FIG. 10 is a graph showing a relationship between an elapsed time and an actually measured value or a calculated value when a driving unit is controlled using the pig iron receiving method according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 blast furnace 3 level meter 4 inclined gutter 5 pan wheel 8 control unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Yasushi Kato 4-33, Kitahama, Chuo-ku, Osaka City, Osaka Prefecture Sumitomo Metal Industries, Ltd. (72) Mitsuo Yamamoto 4-5-Kitahama, Chuo-ku, Osaka City, Osaka No. 33 Sumitomo Metal Industries, Ltd. F term (reference) 4K014 AD17 4K015 KA00

Claims (4)

[Claims] 1. The hot metal that has been tapped by the blast furnace is received by a pan wheel with a tilting gutter inclined in one direction, and then the tilting gutter is tilted in another direction so as to be received by another pan wheel. In the pig receiving method, the elapsed time from the start of the receiving of the ladle is measured, and it is determined whether the elapsed time is equal to or longer than a maximum time of a predetermined time width. An alarm is issued, and the molten metal level in the ladle is measured, and the measured value of the molten metal level is calculated in a time-series manner using a predetermined error reduction method to reduce the error of the measured value. If the elapsed time is less than the longest time, determine whether the calculated value is equal to or greater than a predetermined threshold, if less than the threshold, continue the pig iron, the threshold In the above case, it is determined whether the elapsed time is equal to or longer than the shortest time of the time width, And, the calculated value, the amount of change from the previous calculated value is to determine whether it is within a predetermined range,
If the elapsed time is less than the minimum time or the change amount exceeds the range, an alarm is issued, and if the elapsed time is equal to or longer than the minimum time and the change amount is within the range, A pig iron receiving method characterized by starting pig iron receiving of another ladle wheel. 2. The method according to claim 1, wherein the error reduction method includes calculating the calculated value Y
_k is _obtained by measuring the actual measured value X _k , the number of times of measurement k, the previous calculated value Y _k−1 , a predetermined coefficient α (0 <α <1), and Y _k = αX _k + (1−α) Y _{k The} method according to claim 1, wherein the calculation is performed using the following equation. 3. The method according to claim 2, wherein the error reduction method includes calculating the calculated value Y
_k is calculated from the measured value X _k , the measured number k, the natural number n, and the measured value X _kn n times before, Y _k = (X _k + X _k−1 + X _k−2 +... + X _kn ) / (n +
The pig iron receiving method according to claim 1, wherein the calculation is performed using the following equation: 4. An inclined pouring gutter having hot metal outlets on both sides, inclined in one direction, for receiving hot metal from a blast furnace to a ladle placed under one of the hot metal outlets; A tilting gutter tilting means for tilting the tilting gutter so that it tilts in the other direction so that the ladle placed under the other hot metal outlet receives the molten iron. A level meter that measures the measured value of the level meter, and a calculating unit that uses a predetermined error reduction method to reduce the error of the measured value to a calculated value. Time measuring means for measuring, means for judging whether or not to issue an alarm using the elapsed time and the calculated value, alarm sending means for giving an alarm when it is judged that an alarm should be given, and not giving an alarm Means for determining whether or not to end the pig iron receiving, Means for controlling the tilting gutter tilting means to tilt the tilting gutter so as to tilt in the other direction when it is determined to be finished, and a means for starting pig ironing of another ladle wheel. .