JP3601876B2 - Walking beam control device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an improvement in a divided walking beam control device used for a walking beam device that conveys an object to be conveyed using a walking beam.
[0002]
[Prior art]
This type of walking beam device is used, for example, when conveying a steel slab in a heating furnace, and schematically shows a fixed beam 51 and a moving beam (hereinafter referred to as a walking beam) as shown in FIGS. ) 52 are installed, and a drive source for lifting and lowering and a drive source for traversing are mounted on the side of the walking beam 52, and the walking beam 52 is moved upward, forward, descend, and recover as shown by the arrow A in the drawing by these driving sources. While repeating, the steel slab on the fixed beam 51 is conveyed from the heating furnace entrance side to the heating furnace exit side.
[0003]
By the way, in such a walking beam device, the walking beam 52 is divided into two, of which the heating furnace charging side is referred to as a front walking beam, the heating furnace extraction side is referred to as a rear walking beam, and Is switched from the connection operation for simultaneously driving these two walking beams 52 to the single operation for driving any one of the walking beams 52, or conversely, the operation is switched from the single operation to the connection operation, and the steel slab is conveyed to the heating furnace extraction side. That is being done. Specifically, a steel slab is conveyed while simultaneously operating the front walking beam on the heating furnace charging side and the rear walking beam on the heating furnace extraction side, but a certain steel slab passes through an intermediate position between the two walking beams. Then, when the rear walking beam is completely moved to the transportable area, by switching from the connecting operation to the independent operation, that is, the independent operation of the rear walking beam, the certain steel piece and the next steel piece after the certain steel piece are switched. Transporting is performed while being separated at a distance.
[0004]
Conventionally, when switching from such a connection operation to a single operation or from a single operation to a connection operation, the operator determines the switching timing while checking the position of the steel slab. Since there is no certainty in the accuracy of the slab position in the middle part of the heating furnace, the slab to be switched between the operation modes (joining operation and independent operation) must have a sufficient distance to absorb the tracking accuracy by a sufficient distance. That is being done.
[0005]
On the other hand, the means for correcting the position of the steel slab in the furnace to improve the tracking accuracy is to install an extraction end sensor on the extraction side in the furnace, and when the extraction end sensor detects the steel slab during the operation of the walking beam, the walking beam is detected. By moving to the descending operation, the slab position on the extraction end side in the furnace is corrected based on the stroke amount and the extraction end sensor position until the single operation of the rear walking beam is completed. Correcting the position has been performed. This can be realized because the extraction end sensor is provided on the side of the most extraction port of the heating furnace, so that the extraction end sensor can determine that the steel piece is at the most extraction port of the heating furnace.
[0006]
In addition, an intermediate sensor is installed at an intermediate position in the heating furnace to detect the passing of the billet at the intermediate position, but originally the intermediate sensor only monitors the passing state of the billet, If the steel slab in the furnace was caught and the position of the steel slab shifted little by little, it was not possible to identify which steel slab was used. Therefore, the detection of the billet by the intermediate sensor has a lower certainty compared to the case of the correction by the detection of the billet by the extraction end sensor. Deviation occurs. Therefore, during the connecting operation of the walking beam 52, the correction of the position of the billet with respect to the billet passing through the intermediate portion of the heating furnace is not performed.
[0007]
[Problems to be solved by the invention]
However, in recent years, with the advent of the joining rolling technique in hot rolling, a need has arisen to actively use the connecting operation and the independent operation. In this joining and rolling technique, since joining and rolling are performed for each group of a plurality of billets, it is necessary to transport the inside of the heating furnace separately into a front walking beam and a rear walking beam for each billet group. In this case, since the steel slab is transported for each group, the extraction interval from the heating furnace due to the joining restriction of the rolling line and the charging interval to the heating furnace due to the restriction of the upstream process can be set independently.
[0008]
By the way, when the last billet of the preceding group reaches the position where the last billet of the previous group can be carried by the rear walking beam by the connecting operation, the rear walking beam is moved from the connecting operation. Switching to the single operation by means of the above requires that the last slab of the preceding group be separated from the first slab of the succeeding group, in which case the last slab of the preceding group is ensured. Information about passing through the intermediate sensor is needed.
[0009]
However, in the conventional method of tracking a billet, since there is no certainty in the accuracy of the detection position of the billet by the intermediate sensor, when switching from the linking operation to the single operation according to the billet position information by the intermediate sensor. In addition, while the steel slab required for joining rolling is left on the front walking beam, the independent operation of the rear walking beam is switched to convey the slab, and there is a problem that smooth conveyance and uniform joining rolling cannot be performed.
[0010]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a walking beam control device that enhances the detection accuracy of an initial position of a material to be conveyed by entering a furnace from an empty state of a furnace and obtains an appropriate switching timing. And
[0011]
It is another object of the present invention to provide a walking beam control device for improving the tracking accuracy of a conveyed material.
Still another object of the present invention is to provide a walking beam control device that appropriately switches between a connecting operation and an independent operation.
[0012]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention corresponding to claim 1 is characterized in that a front walking beam and a rear walking beam are arranged in a furnace with an interference portion, and the two walking beams are connected or operated independently in the furnace. A walking beam control device for controlling the transport of the transported material, wherein the sensor for detecting the transported material passing through the interference portion by the independent operation of the front walking beam or the coupling operation of the two walking beams, and the independent operation of the walking beam Alternatively, each time one cycle of the connecting operation of the two walking beams is completed, the position of each material to be transferred is sequentially updated using the stroke amount of the walking beam, and the sensor is charged into the furnace from an empty state of the furnace. When the first conveyed material is detected, Or the control means for controlling the stop of the connection operation, and the first position using the flow amount and the position of the sensor until the walking beam stops completely after the stop control of the walking beam conveyance by the control means. The walking beam control device is provided with an initial position correcting means for correcting the position of the conveyed material and allocating the position correction amount according to the updated position (distance) of each subsequent conveyed material.
[0013]
According to a second aspect of the present invention, a front walking beam and a rear walking beam are arranged in a furnace with an interference portion, and transfer of the conveyed material in the furnace is performed while connecting the two walking beams or performing an independent operation. In the walking beam control device, a sensor that detects a material to be conveyed passing through the interference portion by the single operation of the front walking beam or the coupling operation of both walking beams,Each time one cycle of the single operation of the walking beam or the connection operation of the two walking beams is completed, the position of each material to be conveyed is sequentially updated using the stroke amount of the walking beam conveyance, and the sensor is moved from the empty state of the furnace. Control means for controlling the stop of the single operation or the connecting operation when detecting the passage of the first conveyed material charged into the furnace, and the walking beam is controlled by the control means to stop the walking beam conveyance. The position of the first conveyed material is corrected using the flow amount that moves until it completely stops and the position of the sensor, and this position correction amount is set to the updated position (distance) of each subsequent conveyed material. Initial position correction means for allocating according to, This initial positioncorrectionAfter the initial position is determined by the means, when the walking beam is conveyed by the connecting operation of the two walking beams or the single operation of the rear walking beam, the number of times of detection of the conveyed material is counted from the output of the sensor, and The transported material specifying means for specifying the material, and when the stroke amount from the detection of the transported material by the sensor to the detection off of the transported material exceeds a predetermined width or length of the transported material, the count value is incremented by +1. This is a walking beam control device provided with a count backup means.
[0014]
Next, the invention corresponding to claim 3 is that the front walking beam and the rear walking beam are arranged in the furnace with an interference portion, and the plurality of materials to be conveyed placed on the front walking beam are grooved for each groove unit. In a walking beam control device for transferring to a rear walking beam and transporting the same, a sensor for detecting a material to be transported that passes through the interference portion, a material to be transported at the end of the first group, and a material to be transported at the beginning of the next succeeding group Interval setting means for setting the interval to at least the maximum stroke amount of the walking beam, and after the sensor detects the last transported material of the head group, the transported by the sensor based on the set interval. Recognizing the division between the head group and the next succeeding group while checking the non-detection state of the material, It determines that the-loop is finished transferred to the rear walking beam, a walking beam control apparatus provided with a walking beam drive control means for performing the operations of the rear walking beam least.
[0016]
[Action]
Therefore, the invention corresponding to claim 1 takes the above-described means, so that when the material to be transported is initially charged and the initial position is set, the position at the time of charging the furnace by the charger is set to the initial position. Thereafter, the control means updates the position of each material to be conveyed by adding the stroke amount of the walking beam to the initial position every time one cycle of the front walking beam alone operation or the connection operation of both walking beams is completed.
[0017]
Thereafter, the control means controls the stop of the operation of the walking beam when the first conveyed material is detected by the sensor. Then, a flow amount occurs on the extraction end side. Therefore, the initial position correction means performs the first position correction of the material to be conveyed using the flow amount and the position of the sensor that are moved until the walking beam completely stops after the stop control of the walking beam conveyance, and further, Since the position correction amount is allocated according to the subsequent updated position (distance) of each transported material, the initial position of the transported material can be accurately grasped.
[0018]
Next, an invention corresponding to claim 2 is that, after the initial position of the transported material is determined, the transported material specifying means counts the number of times the transported material is detected from the output of the sensor when the walking beam is transported. Identify the transferred material that has moved onto the walking beam. However, when the transported material is conveyed in a state in which the preceding and following transported materials are small, the transported material may be recognized as one transported material. By comparing the stroke amount of the transferred material with the width or length of the transferred material that can be known in advance, when the stroke amount from the detection ON to the detection OFF exceeds the width or length of the transferred material, counting is performed by performing a count-up. The accuracy of specifying the transfer material can be improved. Further, by correcting the in-furnace position of the conveyed material specified by the count backup means from the movement amount from the detection of the conveyed material by the sensor to the completion of one stroke, the position of the subsequent conveyed material is also performed in accordance with this. The accuracy of the in-furnace position information can be improved.
[0019]
Further, according to a third aspect of the present invention, the distance between the last conveyed material of the first group and the first conveyed material of the next succeeding group is set to be at least equal to or greater than the maximum stroke amount of the walking beam. After detecting the last conveyed material of the first group, based on the set interval, while recognizing the non-detection state of the conveyed material by the sensor, recognizes the division between the first group and the next succeeding group, Since it is determined that the movement to the rear walking beam has been completed, the switching between the connecting operation and the independent operation can be appropriately performed.
[0021]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing one embodiment of a divided walking control device applied to, for example, a heating furnace. In the drawing, reference numeral 1 denotes a heating furnace or the like as an application object, a charger 3 for charging a steel slab 2 at a billet inlet side of the heating furnace 1, and a steel slab from the furnace 1 at a billet extraction port side. An extractor 4 for extracting 2 is disposed. Further, in addition to the fixed beam 5 in the heating furnace 1, as well as the front walking beam 6 operating on the moving trajectory of ascending → forward → declining / restoring, ascending → advancing → declining / restoring. And a rear walking beam 7 that operates on the movement trajectory. The front walking beam 6 is arranged on the charging side inside the furnace, and the rear walking beam 7 is arranged on the extraction side inside the furnace.
[0022]
The charger 3, the extractor 4, the front walking beam 6, and the rear walking beam 7 are provided with driving units 8, 9, 10, and 11, respectively. The driving units 8, 9, 10, and 11 control the operation of the corresponding charger 3, extractor 4, front walking beam 6, and rear walking beam 7 according to the operation command from the control unit 12, and the front walking beam 6 and the With respect to the rear walking beam 7, the billets 2,... Are conveyed to the extraction end side while appropriately performing a connecting operation for repeating the ascending → forward → decreasing / restoring and an independent operation.
[0023]
A required interference portion 13 is set in advance between the front walking beam 6 and the rear walking beam 7, and the front walking beam 6 moves up, forward, descends, and recovers in accordance with the range indicated by the dotted line in FIG. In the process of repeating, while moving to the rear position 15 of the interference portion 13, the billet 2 on the fixed beam 5 is conveyed to the extraction side during its forward movement, while the rear walking beam 7 is moved according to the range of the dotted line in the drawing, that is, according to the arrow C in the drawing. In the process of repeating the ascending → forward → falling / restoring operations, it moves to the front position 14 of the interference portion 13 and conveys the steel slab 2 on the fixed beam 5 to the extraction side during the forward movement.
[0024]
An intermediate sensor 16 for detecting the steel slab 2 is installed near a line substantially equal to the front position 14 of the interference portion 13, that is, at an intermediate point where the operation shifts from the connecting operation to the independent operation. The signal 17 is sent to the control unit 12.
[0025]
The controller 12 includes a billet loading position signal 18 in the charger 3, signals 19 and 20 relating to a stroke amount when the walking beams 6 and 7 are connected and operated independently, and a billet detection signal 17 from the intermediate sensor 16. The operation of the charger 3, the extractor 4, the front walking beam 6, and the rear walking beam 7 is controlled by using the above-described method to track the billet position. 21 is a data storage unit.
[0026]
Next, the operation of the apparatus configured as described above will be described.
(1) Improvement of tracking accuracy of billet at intermediate position
a. Correction of actual position by initial billet loading
Now, as shown in FIG. 2, the operation of connecting the two walking beams 6 and 7 or the independent operation of the front walking beam 6 is performed from the state of the empty furnace, and the steel slabs 2,... Then, the intermediate sensor 16 detects the first billet 2 (2a) in the process of moving to the intermediate portion. Here, upon receiving the billet detection signal 17 from the intermediate sensor 16, the control unit 12 sends a stop command to only the walking beams 6, 7, or 6, but in the middle of the repeated operation of ascending → forward → descent / recovery In the stage, the connection or the single operation is continued until the series of operations is completed. That is, although the control unit 12 has issued the stop command, the billet 2a slightly flows to the extraction side.
[0027]
Therefore, in consideration of this billet flow, the initial position of each billet is obtained as follows. First, the billet loading position signal 18 from the charger 3 is set as an initial value and stored in the data storage unit 21. Thereafter, the position is sequentially updated by receiving the stroke amount signals (pulse signals) 19 and 20 of the front walking beam 6 each time the ascending → forward → fall / recovery operation is repeated each time. Then, when the intermediate sensor 16 detects the steel slab 2a, the flow amount 22 of each steel slab 2 is calculated, and then the correction amount △ Ls is added to the previously updated steel slab position (dotted line d in the drawing). This is the current update position of the billet 2 (2a). The correction amount ΔLs is (the absolute position of the intermediate sensor 16 + the flow amount 22) for the billet 2a. Here, the flow amount 22 is a stroke amount from when the intermediate sensor 16 detects the billet 2a to when the walking beam 6 starts to descend and puts the billet 2a on the fixed beam 5. The subsequent billets 2,... Sequentially execute a position correction operation in accordance with this correction amount, and correct the position of each billet stored in the data storage unit 21.
[0028]
For example, assuming that the correction amount ΔLs of the billet 2a is, the position correction amount ΔLi of each succeeding billet 2 (i) is the correction amount as shown in the following equation (1).Allocate ΔLs in proportion to the distance from the loading end.
[0029]
ΔLi =ΔLs · (Li / Lc)
Where Li:From the charging end of the heating furnace to the succeeding billet 2 (i)Distance, Lc:From the charging end of the heating furnace to the first billet 2aIs the distance.In the equation (1), the first billet 2 put into the heating furnace 1 from the charger 3 can know the exact position, but when the distance from the charging end becomes longer thereafter, the forward movement of the front walking beam 6 Each time is repeated, the position error is gradually accumulated and becomes larger. This means that the shorter the subsequent billet 2 (i) from the loading end, the smaller the position error of each succeeding billet 2 (i) and the first steel at the furthest distance from the loading end. In the case of the piece 2a, the position error is the largest. Then, the position of the first billet 2a is directly corrected using the correction amount ΔLs corresponding to the stroke amount, but the other succeeding billet 2 (i) is based on the above-mentioned formula (1), that is, the charging end. Position correction is performed using the correction amount ΔLi corresponding to the distance from the camera.
[0030]
Thereby, the initial slab position can be adjusted to the actual position. Then, during the period from the state of the empty furnace to the detection of the first steel slab sensor, when the slab is being conveyed by performing the independent operation using the front walking beam 6, the operation is switched to the coupling operation here and the rear walking is performed from the front walking beam 6. The billet moving to the beam is conveyed to the extraction end.
[0031]
b. On the number of billets passing through the intermediate sensor
After the initial position of the slab is determined as described above, the slabs 2,... Move by the connecting operation of the two walking beams 6, 7, and each time the slab moves, the slab detection signal from the intermediate sensor 16 is sent. 3, the number of detected billets is stored in the billet detection counter 21a in the data storage unit 21 as shown in FIG. Match the number of billets with the actual situation. In other words, the billet under the intermediate sensor 16 can be specified from the billet loading position signal 18 from the charger 3 or the billet loading position signal from another sensor and the number of billets passed by the intermediate sensor 16, and hence the rear walking beam. The slab that has moved to 7 can be specified.
[0032]
However, as shown at the bottom of FIG. 3, the interval between the billets is so narrow that the intermediate sensor 16 may not be able to detect a break in the billet due to a problem such as how to place the billets. In this case, as shown in the middle part of FIG. 3, the walking beam stroke amounts from the detection of the billet to the detection of the billet by the intermediate sensor 16 are integrated, and the integrated value and the billet previously stored in the data storage unit 21 are integrated. Compared with the width (see FIG. 12) or the length, when the integrated stroke amount exceeds the width or length of the slab, the count value of the slab detection counter 21a is incremented by +1 and the slab passed through the intermediate sensor 16. Perform backup processing of the number counter. That is, the billet detection counter 21a increments the correction value for the billet d in addition to “3” of the billets a, b, and c by +1 to be a “4” count value. Thereby, the tracking accuracy of the billet can be greatly improved.
[0033]
c. Stop the backup processing of the counter 21a
Next, at the same time as the above-described counter backup processing, the intermediate sensor 16 finally detected the steel piece every time the operation of raising, moving forward, lowering, and restoring the walking beam 6 was completed as shown in FIG. The stroke amount 23 from the time to the completion of the operation is obtained, and the position of the steel piece below the intermediate sensor 16 is corrected based on the stroke amount 23 and the absolute position of the intermediate sensor 16. This correction principle is the same as that described in the above section (a). In this case, the billet under the intermediate sensor 16 can be uniquely identified by the counting process of the number of passing billets described in the above section (b).
[0034]
However, if the stroke amount from the detection of the billet to the completion of the operation of ascending → advance → fall / recovery is too different from the width value of the target billet, the intermediate sensor 16 moves forward and backward as described in (b) above. It is considered that a break in the billet could not be detected, and the correction amount at this time is stopped. When the position correction of the steel slab is performed, the position of the subsequent steel slab is also corrected based on 位置 Li = △ LS · (Li / LC) according to the position correction amount.
[0035]
Therefore, by executing the processes (a) to (c) described above, the position of the billet can be accurately tracked at the center of the heating furnace, and the operation of connecting the walking beams 6, 7 to the independent operation can be performed. Switching timing can be reliably grasped.
[0036]
Although the above description has been made on the assumption that the operation is switched from the connection operation to the independent operation, the tracking of the steel slab at the intermediate position as described above is also performed when the timing of switching from the independent operation to the connection operation depends on the position of the steel slab. The technology for improving accuracy can be used as it is, and smooth and highly accurate switching can be performed.
(2) Recognition of two groups in the middle part
a. Judgment of switching timing by setting billet interval
FIGS. 5 and 6 are diagrams illustrating an example of determining the switching timing when the billet interval is arbitrarily set. As shown in FIG. 5, when the last steel piece 2A of the joining rolling group (leading group) 31 composed of a plurality of steel pieces has passed through the central sensor 16, the rear walking beam 7 from the connecting operation of the walking beams 6, 7 is used. Often you want to switch to a single action. For this purpose, the interval between the last billet 2A of the leading group 31 and the leading billet 2B of the next succeeding group 32 is set to be wider than twice the maximum stroke amount of the walking beams 6, 7. In this setting, since the maximum stroke amount of the walking beams 6 and 7 is known at the design stage in advance, when charging the billet from the charger 3 to the furnace, the interval between the billet 2A and the billet 2B is set to the maximum stroke amount. Set to open twice or more.
[0037]
Then, in the control unit 12, the billet 2A reaches the vicinity of the intermediate sensor 16 on the tracking information and monitors the billet detection signal 17 from the intermediate sensor 16, and when the following condition is satisfied, the billet 2A is rear-walked. It is determined that the vehicle has moved to the position where the beam 7 can be conveyed, and the connection operation is switched to the single operation. The conditions are, as shown in FIG.
* At the completion of the (N-1) -th walking beam transfer (upper row in the same figure), the intermediate sensor 16 has not detected the steel slabs 2A and 2B.
[0038]
* The intermediate sensor 16 has not detected the billets 2A, 2B when the N-th walking beam transfer is completed (a in the lower part of the figure).
* The intermediate sensor 16 has not detected the billets 2A and 2B at least once during the (N-1) th to Nth transports.
[0039]
That is, when the above condition (FIG. 6A) is satisfied, the control unit 12 specifically detects the steel slab 2B by one walking beam conveyance (Nth time) immediately after the steel slab 2A has passed the intermediate sensor 16. When not, it is an example in which it is determined that it is the switching timing of the walking beam and the connection operation is switched to the single operation.
[0040]
On the other hand, in the example of FIG. 6B, after the intermediate sensor 16 detects that the billet 2A has passed through the loading side end (upper), the (N-1) th walking beam conveyance (middle), and the N-th walking In this example, when the billet 2B is not detected in spite of the beam conveyance (lower stage), it is determined that the switching timing of the walking beam has been reached, and the connection operation is switched to the single operation. The example of FIG. 6B is an example in which the interval between the steel slab 2A and the steel slab 2B is set to be at least twice the maximum stroke amount in consideration of the fact that each walking beam moves by the maximum stroke amount. .
[0041]
In FIG. 6, L_ABIs the distance between the billet 2A and the billet 2B (≧ LsMAX × 2), L_N  Is the Nth transport stroke amount (<LsMAX), and LsMAX is the MAX stroke amount.
[0042]
Further, as an application of the above-described embodiment, by predicting the steel piece on the extraction end side when the steel piece 2A passes through the intermediate sensor 16 at the time of charging, the N-1 is obtained from the position and width of the steel piece. It is also possible to predict the stroke amounts of the walking beams 6 and 7 at the time of the Nth and the Nth and determine the interval between the billets.
[0043]
b. As shown in FIG. 5, when the billet group 31 is a material to be batch-rolled, as shown in FIG. 7, when the intermediate sensor 16 has not detected the billet 2A at the completion of the (N-1) th walking beam conveyance, At the next walking beam conveyance timing, the target stroke amount LNmm is not conveyed, but first, it is conveyed by ΔLcmm or more than the normal billet interval, and it is determined whether or not the condition described in the above (2) a is satisfied. I do. In the case of batch transport, since the time interval of extraction is relatively long, it can be transported by a ΔLc (mm) walking beam for the purpose of confirming passage of the billet 2A as described above.
[0044]
Incidentally, FIG. 7A shows that the timing is the switching timing when the billet 2A is not detected despite the first walking beam conveyance of 搬 送 Lcmm (Nth time) immediately after passing the intermediate sensor 16. FIG. 7 (b) shows an example of judgment, and FIG. 7 (b) shows that after detecting the loading end of the billet 2A, despite the two walking beam conveyances, that is, the N-1st and Nth walking beam conveyances, This is an example in which it is determined that it is time to switch when a subsequent billet is not detected.
[0045]
In the example of FIG. 7B, considering that the (N−1) th walking beam transport moves by the maximum stroke amount and the next Nth transport is performed by Lcmm, the billet 2A and the billet 2B are Must be greater than or equal to the maximum stroke amount + ΔLcmm, but the interval can be reduced as compared with the above item (2) a.
[0046]
In FIG. 7, LAB ≧ LsMAX + △ Lc, LN = △ Lc, and LN−1 <LsMAX.
After such a determination, the walking beam is continuously moved by the remaining amount (the target stroke amount LNmm- △ Lcmm) in order to transport the most extracted steel slab to the extraction end. When loading the billet 2B, the billet near the extraction end when the billet 2A is near the intermediate sensor 16 is predicted, and when they belong to the joining rolling group, the extraction pitch is short, and the extraction priority is given. Therefore, the technique according to the above item (2) a is adopted. If not, that is, if the extraction pitch of the material to be batch-rolled has a margin for two cycles of the walking beam, the technique according to the item (2) b is adopted.
(3) Installation of billet detection sensor
In the above embodiment, the intermediate sensor 16 is installed in the intermediate portion of the heating furnace 1. For example, as shown in FIG. The distance LD between the sensor 16 and each of the billet detection sensors 41 and 42 is set shorter than the minimum billet width. On the other hand, the interval between the billet 2A and the billet 2B is made wider than the maximum stroke when the billet 2B is charged. Then, when the condition “two or three adjacent sensors do not detect a billet” is satisfied, it is considered that the last billet 2A of the group 31 has passed the intermediate sensor 16 and it is determined that it is the switching timing of the walking beam. I do.
[0047]
In FIG. 8, (b) to (e) show a state in which such a condition is satisfied. Since the interval between the billet 2A and the billet 2B was set to be equal to or more than the maximum stroke amount, in order to prevent transition from the state shown in FIG. It is. Further, since the sensor interval is less than the minimum billet width, it is to avoid the situation shown in FIG.
The present invention can be implemented with various modifications without departing from the scope of the invention.
[0048]
【The invention's effect】
As described above, according to the present invention, the following various effects can be obtained.
According to the first aspect of the present invention, when initially loading the material to be conveyed into the furnace, the flow amount and the position of the sensor are used until the walking beam is completely stopped after the stop control of the walking beam conveyance. The first position correction of the transferred material is performed, and the position correction amount is allocated according to the updated position (distance) of each subsequent transferred material, so that the initial position of the transferred material can be accurately grasped. Appropriate switching timing can be obtained.
[0049]
According to the second aspect of the present invention, when the walking beam is transported after the initial position of the transported material is determined, the number of times of detection of the transported material is counted from the output of the sensor at the interference portion, and the transported material transferred to the rear walking beam is specified. At the same time, when the front and rear conveyed materials are connected, judgment is made from the predetermined stroke amount and the width or length of the conveyed material, and the count is backed up, so that the accuracy of tracking of the conveyed material is improved. Can
Further, according to the invention of claim 3, after the sensor of the interference portion detects the last conveyed material of the first group, the first group is separated from the next succeeding group while observing the non-detected state of the conveyed material by the sensor. Is recognized, and it is determined that the head group has moved to the rear walking beam, so that the switching between the connection operation and the single operation can be appropriately performed.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing one embodiment of a walking beam control device according to the present invention.
FIG. 2 is a diagram illustrating positioning of a billet at an initial stage;
FIG. 3 is a diagram illustrating a counting process of a billet that has passed through an intermediate sensor.
FIG. 4 is a view for explaining position correction of a steel slab at the center of a heating furnace.
FIG. 5 is a diagram showing a relationship between a leading group and a succeeding group with an intermediate sensor interposed therebetween.
FIG. 6 is an explanatory diagram in which an interval between a leading group and a succeeding group is widened, and an intermediate sensor determines passage in a group unit.
FIG. 7 is an explanatory diagram in which an interval between a leading group and a succeeding group is widened, and the intermediate sensor determines passage in a group unit.
FIG. 8 is an explanatory diagram for judging the passage of the last billet of the leading group by installing a plurality of sensors.
FIG. 9 is a view for explaining the operation of a conventional general walking beam.
FIG. 10 is a view showing a relationship between a walking beam and a billet.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Furnace, 2 ... steel piece, 2A ... Last steel piece of the first group, 2B ... First steel piece of the succeeding group, 5 ... Fixed beam, 6 ... Front walking beam, 7 ... Rear walking beam, 12 ... Control part, 13 interference part, 16 intermediate sensor, 21 data storage part, 21a steel billet detection counter.

Claims (3)

In the walking beam control device that the front walking beam and the rear walking beam are arranged with an interference portion in the furnace, and control the transfer of the conveyed material in the furnace while performing the connecting operation or the independent operation of the two walking beams.
A sensor for detecting a conveyed material passing through the interfering portion by the single operation of the front walking beam or the coupling operation of both walking beams,
Each time one cycle of the single operation of the walking beam or the connection operation of the two walking beams is completed, the position of each material to be conveyed is sequentially updated using the stroke amount of the walking beam conveyance, and the sensor is moved from the empty state of the furnace. Control means for stopping and controlling the single operation or the coupling operation when detecting the passage of the first material to be conveyed charged in the furnace,
After the stop control of the walking beam conveyance by the control means, the position of the first material to be conveyed is corrected by using the flow amount moving until the walking beam completely stops and the position of the sensor. and a initial position correction means for performing allocation in accordance with correction amount update position of each subsequent conveyed material (distance),
A walking beam control device characterized by grasping a conveyed material existing in the interference portion and its position. In the walking beam control device that the front walking beam and the rear walking beam are arranged with an interference portion in the furnace, and control the transfer of the conveyed material in the furnace while performing the connecting operation or the independent operation of the two walking beams.
A sensor for detecting a conveyed material passing through the interfering portion by the single operation of the front walking beam or the coupling operation of both walking beams,
Each time one cycle of the single operation of the walking beam or the connection operation of the two walking beams is completed, the position of each material to be conveyed is sequentially updated using the stroke amount of the walking beam conveyance, and the sensor is moved from the empty state of the furnace. Control means for stopping and controlling the single operation or the coupling operation when detecting the passage of the first material to be conveyed charged in the furnace,
After the stop control of the walking beam conveyance by the control means, the position of the first material to be conveyed is corrected by using the flow amount that moves until the walking beam completely stops and the position of the sensor. An initial position correction unit for allocating a correction amount according to a subsequent update position (distance) of each transported material ;
After the initial position is determined by the initial position correction means, when the walking beam is conveyed by the connecting operation of the two walking beams or the single operation of the rear walking beam, the number of times of detection of the material to be conveyed is counted from the output of the sensor, and the rear walking beam is counted. Transported material identifying means for identifying the transported transported material,
When the stroke amount from the transported material detection ON to the detection OFF by the sensor exceeds a predetermined width or length of the transported material, the backup device includes a count backup unit that increments the count value by +1.
A walking beam control device characterized in that a transport material existing in the interference portion is grasped. A walking beam control in which a front walking beam and a rear walking beam are arranged in a furnace with an interference portion, and are transferred to the rear walking beam for each group unit of a plurality of conveyed materials placed on the front walking beam and conveyed. In the device,
A sensor for detecting a conveyed material passing through the interference portion,
Interval setting means for setting the interval between the last conveyed material of the first group and the first conveyed material of the next succeeding group to at least the maximum stroke amount of the walking beam,
After the sensor has detected the last conveyed material of the first group, based on the set interval, while recognizing the non-detection state of the conveyed material by the sensor, recognizing the division between the first group and the next succeeding group. determines that the first group is finished transferred to the rear walking beam, walking beam control device is characterized in that a walking beam drive control means for performing the operations of at least the rear walking beam.

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