KR100896577B1 - An apparatus for automatically controlling inverse charging of slab into a heating furnace - Google Patents

Abstract

The present invention, when the slab extracted from the heating furnace of the steelworks hot-rolled mill is not entered into the rolling process due to an abnormal occurrence of the post-processing stand-by, the automatic control to back-loading into the furnace again to compensate for the reduced temperature It is related with the automatic control of reverse charging by slab heating.

To this end, the present invention, in the heating furnace reverse charging automatic control device of the slab for reverse charging the slab extracted from the heating furnace using the roller table and the extractor to the heating furnace, the length of the slab and the reference position of the roller table A slab feed distance setting unit configured to set a back feed distance of the slab by using a value, and to reverse drive a roller table according to the back feed distance setting value; The slab feed which calculates the reverse feed distance measured value of the slab using the rotation speed of the back driven roller table, compares the reverse feed distance measured value with the set back feed distance setting value, and stops the roller table when it matches. Distance calculation unit; By using the width of the slab and the reference position value of the extractor to set the first forward distance to the extractor so that the slab is deposited on the extractor, the extractor according to the first forward distance setting value An extractor first advance distance setting unit configured to advance first; The second forward distance is set in the heating furnace of the extractor on which the slab is loaded using the width of the slab and the reference position value of the extractor, and the extractor is set according to the second forward distance setting value. An extractor second forward distance setting unit configured to move forward secondly; An extractor reverse distance setting unit for setting the extractor reverse distance in the heating furnace and reversing the extractor according to the reverse distance setting value; And calculating a moving distance measured value of the extractor, comparing the measured distance and a setting value of one of the first forward distance and the second forward distance, or the reverse distance, and comparing the extracted distance. And an extractor movement distance calculator for stopping the movement.

According to the present invention, it is possible to automatically back charge the heating furnace quickly without lowering the temperature of the extracted slab. It also facilitates work, improves work efficiency, increases productivity, and enables accurate centering, which reduces work time and precisely lengthens slabs.

Slab, heating furnace, back-loading, roller table, extractor, conveying distance, forward and backward distance

Description

AN APPARATUS FOR AUTOMATICALLY CONTROLLING INVERSE CHARGING OF SLAB INTO A HEATING FURNACE}

1 is a process schematic diagram of a typical furnace installation.

2 is a block diagram of a heating device for automatic reverse charging of the slab according to the present invention.

Figure 3 is a detailed configuration according to an embodiment of the automatic control apparatus for the reverse charging of the slab according to the present invention.

Figure 4 is a schematic diagram showing the centering (centering) of the reverse-loading slab according to the present invention.

5 is an operation of the extractor according to the present invention.

6 is a flowchart showing a slab reverse charging process in a heating furnace automatic charging apparatus for slab heating according to the present invention.

 Explanation of symbols on the main parts of the drawings

1: heating furnace 2: roller table

3: extractor 5: extraction door

6: HMD sensor for slab tracking 7,8,9: roller table drive motor

10: roller table PLG 11: extractor drive motor                 

12: Extractor PLG 13: Extractor up and down drive motor

14: extractor rising detection sensor 15: extractor falling detection sensor

16: extraction door drive motor 17: extraction door opening detection sensor

18: extraction door closing detection sensor 19,20: heating furnace wall protection sensor

21: slab 28: gamma ray (γ-ray) sensor

38: extractor rising output portion 39: extractor falling output portion

40: extraction door open output 41: extraction door closed output

42: front and reverse drive unit for the extractor 43: roller table drive unit

210: slab travel distance calculation unit 220: extractor moving distance calculation unit

230: extractor first forward distance setting unit

240: extractor second forward distance setting unit

250: extractor reverse distance setting unit

260: slab feed distance setting unit 270: roller table fine adjustment unit

280: signal output and motor drive output unit 290: setting calculation unit

The present invention relates to an automatic control device for reloading furnaces of slabs, and more particularly, when slabs extracted from a furnace of a steelworks hot rolling mill do not enter the rolling process due to an abnormal occurrence of a post process, they are reduced. It relates to a heating furnace reverse charging automatic control device of the slab for automatic control to back-loading the heating furnace again to compensate for the temperature.

In general, steel mill hot rolling mills are equipped with equipment in the order of a heating furnace, rough rolling, finishing rolling, and a winding machine as a batch process. The slabs extracted by heating to an appropriate temperature in the furnace are rolled to the product thickness according to the demand of the demand in the rolling mill, and then wound in the winding machine.

As such, since the steel mill hot rolling mill is processed in a batch process, when an abnormality occurs in one process, all processes are often stopped. In particular, if the slab extracted from the heating furnace enters the rolling process, if abnormality occurs in the process after the heating furnace, the slab that did not enter the rolling process is kept in the standby state. At this time, the temperature of the slab is gradually reduced and eventually the temperature of the slab falls below the temperature that can be rolled. In this case, even if the post-process is normally operated, the temperature of the slab is already below the temperature at which it can be rolled, thereby causing a problem in that it cannot enter the rolling process.

Therefore, if an abnormality occurs in the post-heating process before the slab extracted from the heating furnace enters the rolling process, the slab extracted from the heating furnace may be prevented from dropping in temperature and maintain the temperature at which the slab extracted may be rolled in the rolling process. The extracted slabs should be back loaded into the furnace, heated to an appropriate temperature and then extracted again.

Referring to Figure 1 will be briefly described a conventional slab heating furnace reverse charging process. 1 shows a process schematic in a typical furnace installation. Referring to FIG. 1, when an abnormality occurs in a process after the heating furnace 1, the slab 21 extracted from the heating furnace 1 does not enter the rolling mill 4 and transfers the slab 21. It waits on the roller table 2 to make. At this time, in order to back-load the heating furnace 1 to maintain the slab temperature required for rolling, a signal signal received by a facility operator (not shown) manually centers the slab 21 on the roller table 2 ( After centering, the roller table 2 is manually operated to reverse the slab 21 toward the furnace 1 so that the slab 21 is positioned on the extractor 3. do. Here, the extractor 3 is a device for extracting the slab 21 from the heating furnace 1 or back-loading the slab 21 back into the heating furnace 1. As such, when the slab 21 is positioned on the extractor 3, the extraction door 5 is opened to manually drive the extractor 3 to the slab 21 in the heating furnace 1. Backload.

However, in the conventional method as described above, it is cumbersome because the driver must manually operate it, and there is a problem in that the operation efficiency is lowered, especially in the case of manually operating the hot slab. In addition, it is difficult to accurately centering due to manual work, there was a problem that takes a long time to reload.

The present invention is to solve the above problems, after the operation of the slab back-loading selection switch to back-load the slab extracted from the heating furnace to the heating furnace, the heating roller to reverse-load the slab exactly to the front roller table Calculate the traversing distance of the slab for centering and calculate the forward and reverse distances in the extractor's furnace to automatically reload the slab into the furnace without the need for the operator. Its purpose is to provide a control device.

In the present invention for achieving the above object, in the heating furnace reverse charging automatic control device of the slab for reverse charging the slab extracted from the heating furnace using the roller table and the extractor, the length of the slab and the roller A slab feed distance setting unit configured to set a back feed distance of the slab using a reference position value of a table, and to reverse drive a roller table according to the back feed distance setting value; The slab feed which calculates the reverse feed distance measured value of the slab using the rotation speed of the back driven roller table, compares the reverse feed distance measured value with the set back feed distance setting value, and stops the roller table when it matches. Distance calculation unit; By using the width of the slab and the reference position value of the extractor to set the first forward distance to the extractor so that the slab is deposited on the extractor, the extractor according to the first forward distance setting value An extractor first advance distance setting unit configured to advance first; The second forward distance is set in the heating furnace of the extractor on which the slab is loaded using the width of the slab and the reference position value of the extractor, and the extractor is set according to the second forward distance setting value. An extractor second forward distance setting unit configured to move forward secondly; An extractor reverse distance setting unit for setting the extractor reverse distance in the heating furnace and reversing the extractor according to the reverse distance setting value; And calculating a moving distance measured value of the extractor, comparing the measured distance and a setting value of one of the first forward distance and the second forward distance, or the reverse distance, and comparing the extracted distance. And an extractor movement distance calculator for stopping the movement.

The extractor first forward distance setting unit sets the first forward distance of the extractor such that 80% or more of the slab width is deposited on the extractor. Here, the first forward distance setting value of the extractor is calculated by Equation 1 below.

[Equation 1]

Extractor's 1st forward set value = (Slab width × 80/100-Slab width / 2)

In addition, the reverse feed distance set value of the slab is calculated by the following formula (2).

[Formula 2]

Back feed distance setting of slab = (length of roller table + length of slab) / 2

In addition, the second forward distance setting value of the extractor is calculated by the following equation (3).

[Equation 3]

2nd forward distance setting of the extractor = (L2 + slab width / 2)

(L2 is a distance setting value from the reference position value of the extractor to the position (gamma ray position) to be reloaded in the heating furnace.)

The present invention provides an automatic control device for reverse charging the slab extracted from the heating furnace of the steelworks hot rolling mill into the heating furnace. In general, in order to roll the slab extracted from the furnace into a product of appropriate thickness according to the demand of the demand, the temperature of the extracted slab must be maintained at the temperature required for rolling. Therefore, in the heating furnace, the slab is heated to a temperature that can be rolled in a rolling process, which is a post-process, and the slab heated and extracted in the heating furnace is transferred to the rolling mill by a roller table. However, when the slab extracted from the heating furnace of a steelworks hot rolling mill composed of a batch processing line has abnormally occurred in the process after the heating furnace before entering the next rolling process, the temperature of the extracted slab is rollable. In order to prevent falling below, it is necessary to back-load it to the furnace again, reheat it to a temperature that can be rolled in the rolling process, and re-extract. Accordingly, the present invention provides a heating furnace reverse charging automatic control device for the slab to automatically control the slab extracted from the heating furnace of the steelworks hot rolling mill to reverse charging the heating furnace.

Particularly, in the present invention, when the slab extracted from the furnace is reverse-loaded, the roller table can be reloaded without a signal to the furnace wall without a signal according to the operation of the slab reverse charge selection switch and reverse charge furnace selection switch. The centered slab is precisely positioned and the centered slab is placed in an extracter, and the slab does not drop off the extractor and is automatically reloaded to the reloading position of the furnace. This prevents the temperature drop of the extracted slab in the event of an abnormality of the post process and rapidly back-loads the heating furnace.

The above objects, features, and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail the present invention.

Figure 2 is a block diagram of a heating apparatus for automatic reverse charging of the slab according to the present invention. As shown in Figure 2, the automatic control device 200 according to the present invention, the length of the slab 21 and the roller table 2 extracted from the heating furnace 1 from the setting calculation unit 290 Receiving a reference position value as an input, using the slab feed distance setting unit 260 for setting the conveying distance for back conveying the slab 21 to the front roller table of the heating furnace 1, the heating furnace ( In order to reverse-load the slab 21 extracted in 1) into the furnace 1 again, the actual distance of the back transfer of the slab 21 to the front roller table of the furnace 1 is calculated. The slab feed distance calculation unit 210 receives the width of the slab 21 and the reference position value of the extractor 3 from the setting calculation unit 290 and uses the same to input the extractor 3 to the extractor 3. Primary transfer of the extractor 3 so that at least 80% of the slab width is deposited. Extractor first forward distance setting unit 230 for setting the distance to, the extractor (3) after the first advance the extractor (3) to raise the 80% or more of the width of the slab (21) The width of the slab 21 and the extractor (from the setting calculation unit 290 and the extractor) are set in order to set the secondary forwarding distance for back loading into the heating furnace 1 by being placed on the extractor 3. The second second forward distance setting unit 240 and the extractor 3 to set an entry distance for back-loading the heating furnace 1 by receiving a reference position value of 3) and using the same, the extractor 3 is heated. An extractor retracting distance setting unit for setting the retracting distance of the extractor 3 in order to enter the furnace 1 and descend again and back load the stacked slabs into the heating furnace and exit the heating furnace 1. 250), the extractor 3 moves substantially (forward or backward) Extractor movement distance calculation unit 220 for calculating the calculated distance, the slab 21 located on the front roller table (2) of the heating furnace (1) does not collide with the furnace wall of the heating furnace (1) when reloading the heating furnace It comprises a roller table adjusting unit 270 for finely adjusting the position of the slab 21, and a signal output unit 280 for outputting a signal transmitted to the heating facility.

Figure 3 is a detailed configuration according to an embodiment of the automatic control apparatus for the reverse charging of the slab according to the present invention. With reference to Figure 3 will be described the operation of the heating furnace reverse charging automatic control apparatus of the slab according to the present invention.

In order to reverse-load the slab 21 extracted from the heating furnace 1 into the heating furnace 1 again, when the facility operator turns on the slab reverse charging selection switch S1, the setting calculator 290 for setting. , The output values from the slab feed distance setting unit 260 and the roller table adjusting unit 270 operate the roller table driving motors 7, 8 and 9 through the roller table motor driving unit 43 so that the roller table 2 Reverse drive. In this way, the slab 21 placed on the roller table 2 is transferred toward the heating furnace 1. Subsequently, the slab conveying distance setting unit 260 adds the length 26 of the slab 21 and the reference position value 27 of the roller table 2 inputted from the setting calculator 290 to the heating unit. After adding the length L1 of the front roller table 2 of the furnace 1, the back feed distance of the slab 21 is set to the value divided by the constant 2. That is, the slab 21 has to be back-transferred by using the length L1 of the slab 21 and the reference position value 27 of the roller table 2 on which the slab 21 is placed. Setting the reverse feed distance.

At this time, in order to calculate the substantial distance from which the slab 21 is conveyed back, when the slab 21 transferred to the front roller table 2 of the heating furnace 1, the slab tracking HMD ( The Hot Metal Detector (6) sensor 6 detects entry of the front roller table 2 of the slab 21, which has been conveyed backward, and counts the rotation speed of the roller table 2 in the roller table PLG 10. The analog value for the number of revolutions counted by the roller table PLG 10 is input to the slab feed distance calculator 210 and converted into a digital value (29), and the slab feed distance calculator 210 is currently driven backward. The actual conveying distance of the slab 21 is calculated using the rotational speed of the roller table 2. Here, preferably, the slab transport distance calculation unit 210 calculates the transport distance of the slab 21 in real time. In this case, the slab transport distance calculation unit 210 compares the calculated transport distance actual value and the slab transport distance setting value calculated by the slab transport distance setting unit 260, the same, Reverse drive will be stopped. In this case, the slab 21 is conveyed backward and centered on the front roller table 2 of the heating furnace 1.

On the other hand, when the back-transfered slab 21 arrives at the front surface of the heating furnace 1, the slab 21 is heated by the furnace furnace wall protection sensors 19 and 20 before back-loading the centered slab 21. The position of the edge of 21 is detected. This detects whether the edge portion of the slab 21 hits the furnace wall of the heating furnace 1 when the furnace is reloaded. When the slab centering completion signal 44 is output from the setting calculation unit 290 and a predetermined signal is detected by the furnace furnace wall protection sensors 19 and 20, the signal unit is transmitted through the first logic unit 310. The alarm lamps 50 and 51 of 340 are turned on, and then the edge table fine adjustment switch S2 is turned on to operate the roller table adjusting unit 270. The roller table adjustment unit 270 finely adjusts the roller table 2 to perform fine centering adjustment so that the edge portion of the slab 21 does not hit the furnace wall.

Subsequently, when the slab 21 to be back loaded is centered on the front roller table 2 of the heating furnace 1, the extractor 3 is disposed so that the slab 21 is placed on the extractor 3. Advance and raise. In this case, in order to prevent the slab 21 from falling from the extractor 3 when the extractor 3 accumulates the slab 21 and back-loads it into the heating furnace 1. Preferably, the extractor 3 is advanced in the extractor 3 so that at least 80% of the width of the slab 21 is deposited. Here, the deposition rate of 80% or more is only one embodiment, and the deposition rate may be adjusted so that the slab 21 does not fall from the extractor 3 during reverse loading.

Accordingly, when the slab centering completion signal 44 is turned on, the extractor first forward distance setting unit 230 may have a width 24 and a width 24 of the slab 21 input from the setting calculation unit 290. Using the reference position value 25 of the roller table 2 on which the slab is placed, the width of the slab 21 is stored above the range where the slab 21 does not fall (applied by 80% in the present invention). The first forward distance setting value of the extractor 3 is calculated. The first forward distance setting value output from the extractor first forward distance setting unit 230 is inputted to the extractor before and after the drive unit 42 to drive the extractor forward and backward driving motors 11. Advance the extractor (3). At this time, when the extractor 3 is driven, the analog value for the rotational speed of the extractor PLG 12 is input to the extractor moving distance calculator 220 and converted into a digital value (30) to calculate the extractor moving distance. In the unit 220, the actual moving distance of the extractor 3 is calculated using the rotation speed. Subsequently, the extractor movement distance calculator 220 calculates the calculated first movement distance of the extractor and the extractor travel distance setting value calculated by the extractor first forward distance setting unit 230. Are compared, and if they match, the extractor 3 is stopped.

When the first forward movement of the extractor 3 is completed and the extractor first forward completion signal 45 is turned on, the on signal is passed through the first logic unit 310 to the second logic unit 320 and The third logic part 330 is transferred. When the on signal is input to the extraction door opening output unit 40 through the first logic unit 310 and the third logic unit 330, the extraction door driving motor 16 is opened by the extraction door opening output unit 40. The extraction door 5 is opened until the extraction door open detection sensor 17 is operated. In addition, when the on signal is input to the extractor lift output unit 38 through the first logic unit 310 and the second logic unit 330, the extractor lift output unit 38 raises the extractor, The lower driving motor 13 is driven up to accumulate the slab 21 on the extractor 3.

As such, after the extractor 3 is first advanced and raised, the slab 21 is placed in the extractor 3, and the extractor 3 moves the slab 21 to the heating furnace 1. To advance back into the secondary). To this end, the extractor second forward distance setting unit 240 uses the extractor reference position value 25 and the width 24 of the slab 21 input from the setting calculation unit 290. By adding the distance L2 from the centerline of (2) to the gamma-ray sensor 28 shown in Fig. 5, the second forward distance of the extractor 3 is set. The set second forward distance setting value is added to the first forward distance setting value and input to the extractor before and after the extractor 42, and by the extractor 42 before and after the extractor. The extractor 3 is advanced forward by driving the forward and backward driving motors 11.

When the extractor 3 advances a second time, as described above, the analog value of the rotation speed of the extractor PLG 12 is input to the extractor movement distance calculator 220 and converted into a digital value (30). ), The extractor movement distance calculator 220 calculates the actual movement distance of the extractor 3 using the rotational speed. Subsequently, the extractor moving distance calculator 220 compares the calculated moving distance actual value with the second forward forward distance setting value calculated by the extractor second forward distance setting unit 240 and matches the same. Stop the extractor 3. When the second advance of the extractor 3 is completed and the extractor second forward completion signal 46 is turned on from the setting calculator 290, the on-signal is the first logic unit 310. ) And the extractor descending output unit 39 through the third logic unit 330, and the extractor descending output unit 39 drives the extractor raising and lowering motor 13 to extract the extractor ( 3) is lowered. When the extractor 3 is lowered and the extractor lowering detection sensor 15 is operated, the extractor 3 reverses. The reverse distance setting value of the extractor 3 is calculated by the extractor reverse distance setting unit 250. That is, the reverse distance of the extractor 3 is calculated by the extractor reverse distance setting unit 250 by adding the distance value set to the reference position value 25 of the extractor. In one embodiment of the present invention, the reverse distance of the extractor 3 is calculated as the reference position value 25 of the extractor plus 250 [mm]. This may be changed according to the actual workplace conditions.

The calculated extractor reverse distance setting value is added to the first and second forward distance setting values, and is input to the extractor before and after the extractor 42, and to the extractor before and after the extractor 42. As a result, the extractor 3 is reversed by driving the extractor driving motor 11 before and after the extractor.

When the extractor 3 reverses, as described above, the analog value for the rotational speed of the extractor PLG 12 is input to the extractor moving distance calculator 220 and converted into a digital value (30). The extractor movement distance calculator 220 calculates the actual movement distance of the extractor 3 using the rotational speed. Subsequently, the extractor movement distance calculator 220 compares the calculated movement distance actual value with the reverse distance setting value calculated by the extractor reverse distance setting unit 240 and matches the extractor 3. To stop. Subsequently, when the extractor 3 is reversed and the extractor reverse completion signal 47 is turned on from the setting calculation unit 290, the on-signal is converted into a first logic unit 310 and a third logic unit ( 330 is input to the extraction door close output unit 41, and the extraction door closing output unit 41 rotates the extraction door driving motor 16 to close the extraction door 5. At this time, the extraction door 5 is closed until the extraction door closing detection sensor 148 is operated. As a result, the slab 21 is back loaded into the heating furnace 1.

Figure 4 is a schematic diagram showing the centering (centering) of the reverse-loading slab according to the present invention. In order to reverse-load the slab 21 extracted from the heating furnace 1 into the heating furnace 1 again, the slab 21 is transported backward by the operation of the roller table driving motor 8 to thereby reverse the slab 21. Centering is carried out by positioning on the front roller table 2 of 1). At this time, the roller table PLG 10 is used to calculate the actual moving distance of the slab 21 by counting the number of revolutions of the roller table 2. As such, the centering position of the slab 21, which has been conveyed backward, should not be detected by the furnace wall protection sensors 19,20.

In view of this, the slab feed distance setting value for centering the slab 21 on the front roller table 2 of the heating furnace 1 is, as shown in FIG. 4, the length of the roller table 2 ( L1) and the length of the slab 21 are added and then divided by two.

Fig. 5 shows the operation of the extractor according to the present invention, after the slab 21 is positioned on the front roller table 2 of the furnace 1 and the centering is completed, The operation diagram of the extractor 2 for calculating the set values of the first and second forward distances and the set values of the reverse distances is shown briefly.

As shown in FIG. 5, the slab 21 extracted from the heating furnace 1 is back conveyed and centered on the roller table 2 on the front of the heating furnace 1. On the other hand, in FIG. 5, as an example, the position of the extractor 3 sets the center line of the roller table 2 as a reference. The extractor 3 is first advanced, but is first advanced such that at least 80% of the width of the slab 21 is deposited. Therefore, the extractor 3 is at least the reference position value of the extractor 3 (that is, the center line of the table is set to the reference position value "0") at least (width of slab x 80/100-slab width / 2). The first advance shall be over [mm]. As such, the extractor first forward distance setting unit 230 calculates the first forward distance setting value of the extractor.

In addition, if the extractor 3 has the slab 21 loaded at least 80% of the slab 21 and the extraction door 5 is opened by the extraction door drive motor 16, the slab 21 is opened in the heating furnace 1. Advance the second time to reverse load. Here, the second forward advances farther than the position L2 of the gamma ray sensor 28 described above. That is, the gamma ray sensor 28 is for detecting the reverse loading position of the slab and its position is set by the user, which may be changed according to a working condition. The decharged slab 21 is further advanced so that it is not detected by the sensor 28. Therefore, the extractor 3 is advanced second more than at least (L2 + slab width / 2) from the reference position value of the extractor 3. Here, L2 is a distance from the reference position value of the extractor to the gamma ray 28. The gamma ray 28 is located at a distance for back loading the slab 21 into the heating furnace 1. In this way, the extractor second forward distance setting unit 240 calculates the second forward distance setting value of the extractor 3.

In addition, when the reverse charge is completed by the extractor 3 to perform the second forward, the extractor 3 is lowered and moved back to the set position. The reverse distance setting value of the extractor 3 is calculated by adding 250 mm to the reference position value of the extractor 3. Here, the 250mm is set by the user as an example of the present invention, it can be changed according to the working conditions.

6 is a flowchart showing a slab reverse charging process in a heating furnace automatic charging apparatus for slab heating according to the present invention. This will be described with reference to FIG. 6. In order to reverse charge the slab 21 extracted from the heating furnace 1 into the heating furnace 1, the slab reverse charging switch S1 is first turned on (S601). The setting calculator 290 sets the length and width of the extracted slab 21 (S602), and the roller table 2 reversely drives the slab 21 to back feed (S603). The slab feed distance setting unit 260 calculates the feed distance set value of the slab (S604). At this time, the slab feed distance set value is calculated as (L1 + slab length) / 2 (where L1 is the length of the roller table). Subsequently, when the slab tracking device moves back toward the front roller table 2 of the heating furnace 1 and detects the position of the slab, the slab tracking HMD sensor 6 is turned on (S605). The movement distance calculation unit 210 calculates the reverse distance measurement value of the slab 21 (S606). By comparing the slab feed distance set value and the slab feed distance measured value (S607). If the two values do not match, the process proceeds to step S603 and the roller table 2 is continuously driven until the two values coincide. If the two values coincide in the step S607, the roller table 2 is stopped (S608). The slab 21 is thus ready to be centered on the front roller table 2 of the furnace 1 and back loaded into the furnace 1. At this time, when both of the furnace wall protection sensors 19 and 20 are not turned off and any one of them is turned on (S609), the centering of the slab 21 is fined by the roller table fine adjustment unit 270. It is adjusted (S610). The fact that both the furnace wall protection sensors 19 and 20 are off means that the slab 21 does not hit the furnace wall when the slab 21 is back loaded into the furnace 1. When both of the furnace wall protection sensors 19 and 20 are turned off, the extractor first forward distance setting unit 230 calculates the first forward distance setting value of the extractor 3 and according to the set value. The extractor 3 is advanced (S611). Here, the first forward distance setting value is calculated as (slab width x 80/100-slab width / 2). This is a value for placing 80% or more of the slab width on the extractor 3 as described above. When the extractor 3 advances first, the extractor movement distance calculator 220 calculates the first advance distance measured value of the extractor 3 (S612). Subsequently, the extractor first forward distance setting value and the first forward distance measured value are compared (S613). If the two values do not coincide, they are advanced until they coincide with each other. The extractor 3 is stopped (S614).                     

When the first forward movement of the extractor 3 is completed, the extraction door is opened by the extraction door motor driver 16 (S615), and the extractor 3 opens the stacked slab 21 to the heating furnace ( 1) Ascending to reverse charge into (S616). Subsequently, the extractor second forward distance setting unit 240 calculates the second forward distance setting value of the extractor 3 for back loading the slab 21 into the heating furnace 1 ( S617). The second forward distance set value is calculated as (L2 + slab width / 2) (where L2 is the distance from the reference position value to the gamma ray sensor 28, as shown in FIG. 5). This is a value for charging the slab 21 farther than the gamma ray sensor 28 as described above. When the extractor 3 advances a second time, the extractor movement distance calculator 220 calculates the second advance distance measured value of the extractor 3 (S618). Subsequently, the extractor compares the second forward distance set value and the second forward distance measured value (S619), and if the two values do not match, advances until they match, and when the two values coincide, The extractor 3 is stopped (S620).

When the second advance of the extractor 3 is completed, the extractor 3 descends (S621). Subsequently, the extractor reverse distance setting unit 250 calculates a reverse distance setting value of the extractor 3 (S622). In one embodiment of the present invention, the reverse distance setting value is calculated as (a reference position value of the extractor + 250 mm). When the extractor 3 moves backward according to the set reverse distance, the extractor movement distance calculator 220 calculates an actual value of the reverse distance of the extractor 3 (S623). Subsequently, the extractor reverse distance setting value and the reverse distance actual value are compared (S624), and if the two values do not coincide, they are continuously retracted until they match. If the two values coincide, the extractor 3 ) To stop the reverse (S625). When the reverse of the extractor 3 is completed, the extraction door driving motor 16 is operated to close the extraction door 5 (S626).

In the above detailed description and drawings, an automatic control device for back-loading the slab extracted from the heating furnace into the heating furnace is described for a specific reason that an abnormality occurs in a process after the heating furnace. According to one embodiment and the present invention is not limited to the understanding. That is, the slab may be back loaded into the furnace for various reasons, such as when the heating temperature of the slab is not maintained at the temperature required for rolling due to an abnormality in the furnace itself. Such an application may be variously applied by those skilled in the art to which the present invention pertains.

Accordingly, the detailed description and drawings of the present invention disclose one preferred embodiment to help understand the present invention, and do not limit the scope of the present invention, and the scope of the present invention is determined by the above description. It should be determined by the appended claims rather than by the appended claims.

According to the present invention, when the slab extracted from the heating furnace is back loaded into the heating furnace due to abnormality in the post-heating process, the slab can be automatically back loaded into the heating furnace, and the temperature of the extracted slab is It can be back loaded into the furnace quickly without degrading it. In addition, compared to the conventional manual re-loading, the work is easier and the work efficiency is improved, thereby increasing the productivity. In addition, accurate centering allows for a shorter working time and accurate back loading of the slabs.

The above detailed description and contents disclosed in the drawings are not intended to limit the present invention, and it is apparent to those skilled in the art that various modifications and changes can be made without departing from the spirit of the present invention. will be.

Claims (5)

In the heating furnace reverse charging automatic control device of the slab for reverse charging the slab extracted from the heating furnace using the roller table and the extractor, A slab feed distance setting unit configured to set a reverse feed distance of the slab by using the slab length and a reference position value of the roller table, and to reverse drive the roller table according to the reverse feed distance setting value; The slab feed which calculates the reverse feed distance measured value of the slab using the rotation speed of the back driven roller table, compares the reverse feed distance measured value with the set back feed distance setting value, and stops the roller table when it matches. Distance calculation unit; By using the width of the slab and the reference position value of the extractor to set the first forward distance to the extractor so that the slab is deposited on the extractor, the extractor according to the first forward distance setting value An extractor first advance distance setting unit configured to advance first; The second forward distance is set in the heating furnace of the extractor on which the slab is loaded using the width of the slab and the reference position value of the extractor, and the extractor is set according to the second forward distance setting value. An extractor second forward distance setting unit configured to move forward secondly; An extractor reverse distance setting unit for setting the extractor reverse distance in the heating furnace and reversing the extractor according to the reverse distance setting value; And Calculates a moving distance measured value of the extractor, and compares the measured distance value with any one of the first forward distance and the second forward distance or a reverse distance setting value, and agrees to move the extractor; Automatic heating apparatus for the reverse charging of the slab, characterized in that it comprises an extractor moving distance calculation unit for stopping the. The method of claim 1, wherein the extractor first forward distance setting unit, The apparatus for automatic reverse charging of a slab of a slab, characterized in that the first forward distance of the extractor is set such that at least 80% of the slab width is deposited on the extractor. The method according to claim 1 or 2, The apparatus for automatic reloading of a slab furnace according to claim 1, wherein the first forward distance setting value of the extractor is calculated by Equation 1. [Equation 1] 1st forward setpoint = slab width × 80/100-slab width / 2 The method of claim 1, The slab reverse feed distance set value is calculated by the following equation 2 Slave heating furnace automatic control device. [Formula 2] Back feed distance setting of slab = (length of roller table + length of slab) / 2 The method of claim 1, Secondary forward distance set value of the extractor is calculated by the following equation 3, heating apparatus for automatic reverse charging of the slab. [Equation 3] 2nd forward distance setting = L2 + slab width / 2 (L2 is a distance setting value from the reference position value of the extractor to the position to be reloaded in the furnace.)

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