JP7192440B2 - Steel strip supply method and supply device - Google Patents

Description

The present invention provides, for example, a connection device capable of connecting the tail end of a first steel strip paid out from a first delivery device and the leading end of a second steel strip delivered from a second delivery device. relates to a steel strip supply method and supply device.

For example, in Patent Document 1, steel strips discharged from each of two payoff reels (1POR, 2POR) are connected by welding with a welder 13, and the connected steel strips are connected to a continuous processing facility downstream of the welder 13. Disclosed is a method of supplying steel strip to a steel strip.

In FIG. 2(a) of Patent Document 1, the tip of the high-carbon steel strip discharged from 1POR is guided to the welder 13, and the low-carbon steel strip is passed through the bridle roll 15 preceding the high-carbon steel strip. It is connected to the rear end of the carbon steel strip by welding. In addition, in FIG. 2(b) of the same document, the low carbon steel strip is discharged from 2POR and guided to the welder 13, and the rear end of the leading high carbon steel strip and the rear end of the low carbon steel strip are welded in the welder 13. connected by

According to the steel strip supply method described in Patent Document 1, the trailing end of the preceding steel strip remains in the welder 13, and is then connected to the remaining steel strip rear end. The tip of the steel strip that is in contact with the welder 13 is guided toward the welder 13 .

Further, in FIG. 2 of Patent Document 2, before the delivery of the preceding material A delivered from the first delivery shaft 2 is completed, the trailing material B delivered from the second delivery shaft 3 is transferred to the leading end conveying conveyor 4b. , and the tip thereof is sandwiched between pinch rolls 7a and 7b to wait before the junction of the pass line with the preceding material (see, for example, paragraph 0018 of the same document). After the preceding material A is cut by the welder 5, the leading edge of the following material B is fed to a position where it hits the tail end of the preceding material A waiting in the welder 5. A and succeeding material B are welded (see paragraph 0019).

The continuous steel strip in which the tail end of the preceding material and the leading end of the following material are thus connected is supplied to continuous processing equipment for processing the steel strip.

JP 2014-73512 A JP-A-9-271839

According to the above-mentioned patent document, the preceding material runs along the pass line from the POR to the welder while the preceding material is being discharged, and the succeeding material cannot enter the pass line. You will have to wait in front of the confluence of the lines. After the tail end of the preceding material reaches the welder and stops, the leading edge of the trailing material is passed through the confluence point of the pass lines and traveled toward the welder, and the leading edge of the trailing material reaches the welder. , the tail end of the preceding material and the tip of the following material are welded.

However, from the viewpoint of production efficiency, etc., it is desirable to minimize the waiting time (downtime) until the continuous steel strip in which the preceding material and the following material are connected can be supplied to the continuous processing equipment.

The present invention has been made in view of such a point, and is a steel that can shorten the waiting time until a continuous steel strip in which a preceding material and a succeeding material are connected can be supplied to a continuous processing facility. It is an object of the present invention to provide a strip feeding method and device.

(1) The steel strip supply method of the present invention comprises:
A method of supplying a steel strip to a connection device capable of connecting the tail end of a first steel strip and the tip end of a second steel strip, comprising:
a first steel strip supply process of dispensing the first steel strip from the first dispensing device and stopping the tail end of the first steel strip at the connecting device;
a second steel strip supply process of dispensing the second steel strip from the second dispensing device and stopping the tip of the second steel strip at the connecting device;
has
The second steel strip supply process includes:
When the tail end of the first steel strip passes through the confluence of the pass line of the first steel strip and the pass line of the second steel strip , the leading end waits upstream from the confluence. and a process of starting to run the second steel strip toward the connecting device.

(2) The steel strip supply device of the present invention is
A steel strip supply device for connecting a tail end of a first steel strip and a tip end of a second steel strip, comprising:
a first dispensing device for dispensing the first steel strip;
a second dispensing device for dispensing a second steel strip;
The first steel strip is delivered from the first delivery device, the tail end of the first steel strip is stopped at the connection device, and the second steel strip is delivered from the second delivery device, a control device capable of executing control to stop the tip of the second steel strip at the connecting device;
with
The control device is
When the tail end of the first steel strip passes through the confluence of the pass line of the first steel strip and the pass line of the second steel strip , the leading end waits upstream from the confluence. It is characterized in that it is possible to execute a process of starting the running of the second steel strip toward the connecting device.

According to the steel strip supply method of (1) and the steel strip supply apparatus of (2), the tail end of the first steel strip is located on the pass line of the first steel strip and the pass of the second steel strip. When passing through the confluence with the line, the second steel strip whose tip is waiting upstream from the confluence is processed to start traveling toward the connecting device. Therefore, it is possible to shorten the downtime compared to the conventional system in which the trailing material starts running after the trailing end of the preceding material reaches a predetermined stop position and stops.

According to the present invention, there is provided a steel strip supply method and supply apparatus capable of shortening the waiting time until a continuous steel strip in which a preceding material and a succeeding material are connected can be supplied to a continuous processing facility. can be done.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an example of an overall schematic diagram of continuous processing equipment for processing a continuous steel strip in which a preceding material and a succeeding material are connected; It is an example of the schematic diagram which shows the entry side equipment concerning 1st Embodiment. 6 is an example of a flowchart schematically showing the flow of entry-side processing executed by the control device in the first embodiment; It is an example of the schematic diagram which shows the entry side equipment concerning 2nd Embodiment.

FIG. 1 is an example of an overall schematic diagram of continuous processing equipment for processing a continuous steel strip in which a preceding material and a succeeding material are connected. As the continuous processing equipment shown in FIG. 1, for example, the continuous pickling equipment 1 will be described as an example. Any other processing may be performed as long as the processing is performed.

As shown in FIG. 1, the continuous pickling equipment 1 includes an inlet equipment 10 that feeds steel strip as a continuous steel strip to a treatment equipment 20 described later, and a processing equipment that processes the continuous steel strip sent out from the inlet equipment 10. Equipment 20, delivery side equipment 30 for cutting the continuous steel strip processed by the processing equipment 20 and winding it into a coil, etc., and an entry side looper provided between the entry side equipment 10 and the processing equipment 20. 40 , an output side looper 50 provided between the processing equipment 20 and the output side equipment 30 , and a control device 60 .

The entry-side equipment 10 mainly includes a first POR 12 and a second POR 14 for dispensing steel strips, and a connection device 16 as a welder, the details of which will be described later.

The treatment facility 20 mainly includes a pretreatment facility 22 such as a scale breaker, a pickling tank 24, and a posttreatment facility 26 for rinsing the steel strip, for example. If the continuous treatment equipment is not the continuous pickling equipment 1, other equipment will be provided in place of these in accordance with the purpose.

The delivery side equipment 30 mainly includes a cutting device 32 for cutting the continuous steel strip processed by the processing equipment 20, and winding devices 34 and 36 for coiling the steel strip cut by the cutting device 32. .

Both the entry-side looper 40 and the exit-side looper 50 are equipment capable of changing the running speed of the steel strip around the loopers 40 and 50 by changing the amount of loops in which the length of the continuous steel strip is accumulated. .

The control device 60 executes at least entry-side processing according to a command from a higher order. The entry-side process is processing such as unloading of the steel strip from the first POR 12 and the second POR 14, and running/stopping of the steel strip unloaded from the first POR 12 and the second POR 14, details of which will be described later.

The configuration of the entry-side facility 10 and the control by the control device 60, which are characteristic features of the present invention, will be described below.

(First embodiment)
FIG. 2 is an example of a schematic diagram showing the entry-side facility 10 according to the first embodiment. 1st Embodiment is a form in case the carbon content (mass percent density|concentration) is 0.6% or less common steels are connected by the connection apparatus 16. FIG. In FIG. 2, the steel strip discharged from the first POR 12 is shown as the trailing material. In FIG. 2, the control device 60 is also illustrated for convenience of explanation.

The first POR 12 and the second POR 14 dispense, for example, a coiled steel strip, and the first POR 12 and the second POR 14 alternately dispense the steel strip. The steel strip discharged from the first POR 12 travels along the upper first pass line 121, the steel strip discharged from the second POR 14 travels along the lower second pass line 142, and the steel strip is supplied to the connecting device 16. be done.

Incidentally, as shown in FIG. 2, the first pass line 121 and the second pass line 142 merge at the differential pinch roll 18 . Also, the first POR 12 and the second POR 14 correspond to the dispensing device of the present invention.

The connecting device 16 is called a flash butt welder, for example, and connects the tail end of the preceding material and the leading end of the succeeding material by welding to form a continuous steel strip. As described above, both the preceding material and the succeeding material are ordinary steel.

When the tail end of the preceding material and the tip of the following material are welded by the connecting device 16, the preceding material and the following material are clamped (not shown) while the tail end of the preceding material and the tip of the following material are stopped. sandwiched from above and below. Then, the tail end of the preceding material and the tip of the succeeding material are cut by a cutting device (not shown), and the tail end of the preceding material and the tip of the succeeding material are arranged facing each other and welded. The continuous steel strip in which the leading material and the trailing material are welded together is delivered to the processing equipment 20 downstream of the entrance equipment 10 .

When the continuous steel strip with the preceding material and subsequent material welded together is delivered to the processing equipment 20 , the control device 60 increases the running speed of the continuous steel strip in the entry-side equipment 10 .

Normally, the running speed of the continuous steel strip in the entry-side facility 10 upstream of the entry-side looper 40 (hereinafter referred to as "entry-side speed") is set to By increasing the traveling speed of the continuous steel strip on the upstream side of the looper 50 (hereinafter referred to as "central speed"), the loop amount in the entry-side looper 40 is increased. When the tail end of the preceding material and the leading end of the following material are welded in the entry-side equipment 10, the entry-side speed is reduced, and finally the tail end of the continuous steel strip is stopped at the connecting device 16. Stop at a position (hereinafter simply referred to as a "predetermined stop position"). While the entry-side speed is lower than the central speed, the loop amount stored in the entry-side looper 40 is consumed. When the welding of the trailing end of the preceding material and the leading end of the succeeding material is completed in the connecting device 16, the entry side speed is increased to a speed higher than the central speed, and the loop amount in the entry side looper 40 increases again. In this way, it is possible to reduce or stop the entry-side speed and the exit-side speed while suppressing a decrease in the central speed and preferably maintaining the central speed.

In this specification, the period in which the entry speed is slower than the central speed is hereinafter referred to as downtime, and the period during which the steel strip discharged from the first POR 12 or the second POR 14 is delivered to the processing facility 20 as a continuous steel strip. A series of processes performed in the facility 10 is called an incoming process. Inbound processing is processing that occurs in downtime. Also, the predetermined stop position is a position at which the preceding material is stopped in order to perform the entry-side processing. Hereinafter, the position at which the succeeding material is stopped for executing the entry-side process is also referred to as the predetermined stop position.

By the way, if the entry-side processing takes a long time, the downtime becomes long, and although the entry-side looper 40 is provided, there are cases where the central speed has to be reduced. If the center speed is reduced, the production efficiency will decrease, so it is required to shorten the time required for the entry side processing as much as possible to shorten the downtime.

Therefore, in the present invention, downtime is shortened by performing entry-side processing by a method different from the conventional method.

The entry-side processing according to the present invention will be described with reference to FIG. FIG. 3 is an example of a flowchart schematically showing the flow of entry-side processing executed by the control device 60 in the first embodiment.

First, in step S10, the control device 60 determines whether or not the remaining length of the preceding material is equal to or less than a predetermined length. If the remaining length of the preceding material is not equal to or less than the predetermined length (NO in step S10), the control device 60 ends the entry-side processing. On the other hand, if the remaining length of the preceding material is equal to or less than the predetermined length (YES in step S10), the control device 60 proceeds to step S12.

In step S12, the control device 60 starts decelerating the tail end speed of the preceding material. The reason for decelerating the tail end speed of the preceding material, not the speed reduction of the preceding material, is that the preceding material is a continuous steel strip running through the processing equipment 20, and the center speed of this continuous steel strip is decelerated. This is to reduce the velocity of the tail end of the continuous steel strip, that is, the upstream side of the entry looper 40 . After completing the processing of step S12, the control device 60 proceeds to step S14.

In step S14, the control device 60 determines whether or not the tail end of the preceding material, which is the continuous steel strip running in the continuous pickling facility 1, has passed the differential pinch roll 18 at the confluence. If the tail end of the preceding material has not passed the differential pinch roll 18 (NO in step S14), the process of step S14 is repeated until the tail end of the preceding material passes the differential pinch roll 18. When it is determined that the tail end of the preceding material has passed through the differential pinch roll 18 (YES in step S14), the control device 60 proceeds to step S16.

In step S16, the controller 60 starts running the trailing material. The leading end of the trailing material is on standby upstream of the differential pinch roll 18 and near the differential pinch roll 18, and in the process of step S16, the leading end of the trailing material is upstream of the differential pinch roll 18 and close to the differential pinch roll 18. Start running of the trailing material waiting in the vicinity of . That is, immediately after the trailing end of the preceding material passes through the differential pinch roll 18, the trailing material whose leading end is waiting upstream of the differential pinch roll 18 and in the vicinity of the differential pinch roll 18 starts running. It will happen. After completing the process of step S16, the control device 60 moves to the process of stopping the tail end of the preceding material (steps S18 to S22).

In the process of stopping the tail end of the preceding material, the control device 60 first determines whether the tail end of the preceding material is not stopped, that is, whether it is stopped at a predetermined stop position (step S18), If the tail end of the preceding material is not stopped, that is, if the tail end of the preceding material is stopped at a predetermined stop position (NO in step S18), subsequent stop processing of the tail end of the preceding material (steps S20 and Step S22) is skipped, and the following material stopping process (steps S24 to S28) is performed. On the other hand, if the tail end of the preceding material is not stopped, ie, is running (YES in step S18), the control device 60 proceeds to step S20.

In step S20, the control device 60 determines whether or not the tail end of the preceding material has reached a predetermined stop position. If the trailing end of the preceding material has not reached the predetermined stop position (NO in step S20), the subsequent stopping process of the trailing end of the preceding material (step S22) is skipped, and the following process of stopping the succeeding material (step S24) is skipped. to step S28). On the other hand, if the tail end of the preceding material has reached the predetermined stop position (YES in step S20), the process proceeds to step S22.

In step S22, the control device 60 performs processing for stopping the tail end of the preceding material. After completing this process, the control device 60 proceeds to the subsequent material stopping process (steps S24 to S28).

In the process of stopping the succeeding material, the control device 60 first determines whether or not the succeeding material is not stopped, that is, whether or not the leading end of the succeeding material is stopped at a predetermined stop position (step S24). ), if the trailing material has not stopped, that is, if the leading end of the trailing material has stopped at a predetermined stop position (NO in step S24), subsequent stopping processing of the trailing material (steps S26 and S28) ) and go to step S30. On the other hand, if the trailing material has not stopped, ie, is running (YES in step S24), the control device 60 proceeds to step S26.

In step S26, the control device 60 determines whether or not the leading edge of the succeeding material has reached a predetermined stop position. If the leading end of the trailing material has not reached the predetermined stop position (NO in step S26), the subsequent stop processing of the trailing material (step S28) is skipped, and the process proceeds to step S30. On the other hand, if the leading edge of the succeeding material has reached the predetermined stop position (YES in step S26), the process proceeds to step S28.

In step S28, the control device 60 performs a process of stopping the trailing material. After completing this process, the control device 60 proceeds to step S30.

In step S30, the control device 60 determines whether both the preceding material and the following material are stopped. Determine whether it is stopped. If either the tail end of the preceding material or the leading end of the following material is not stopped at a predetermined stop position (NO in step S30), the tail end of the preceding material is stopped (steps S18 to S22) and Both of the subsequent material stop processing (steps S24 to S28) are repeated.

However, it is not always necessary to repeatedly perform both the stopping process of the tail end of the preceding material (steps S18 to S22) and the stopping process of the succeeding material (steps S24 to S28). For example, when the tail end of the preceding material is not stopped at the predetermined stop position, the tail end of the preceding material is stopped (steps S18 to S22), and the leading end of the following material is stopped at the predetermined stop position. If not, the subsequent material stop processing (steps S24 to S28) may be performed.

On the other hand, in step S30, when both the tail end of the preceding material and the leading end of the succeeding material are stopped at the predetermined stop positions (YES in step S30), the process proceeds to step S32.

In step S32, the connection device 16 performs disconnection processing. In this cutting process, the preceding material and the succeeding material are sandwiched and fixed by clamps (not shown) from above and below, and then the tail end of the preceding material and the leading end of the succeeding material are cut. After completing this process, the controller 60 proceeds to step S34.

In step S34, the control device 60 performs welding processing. In this welding process, the tail end of the cut preceding material and the leading end of the following material are butted and welded to form a continuous steel strip. After completing this process, the controller 60 proceeds to step S36.

At step S36, the controller 60 starts the continuous steel strip feeding process. This continuous steel strip feeding process is a process of feeding a continuous steel strip, in which a preceding material and a subsequent material are welded together, to the processing equipment 20 . This process accelerates the entry speed to a speed higher than the center speed. When the entry-side speed exceeds the center speed, the loop amount in the entry-side looper 40 increases. After completing this process, the controller 60 proceeds to step S38.

In step S38, the control device 60 performs preparation processing for dispensing the next succeeding material. This payout preparation process is a process of paying out the steel strip from the first POR 12 or the second POR 14 until the tip of the succeeding material reaches the upstream side of the differential pinch roll 18 and the vicinity of the differential pinch roll 18 . It should be noted that it is not always necessary to carry out the preparation process for delivering the next trailing material after the continuous steel strip delivery process, and it can be carried out after the trailing end of the preceding material has passed through the differential pinch rolls 18 . After completing this process, the control device 60 ends the entry-side process.

In this way, immediately after the tail end of the preceding material passes through the differential pinch roll 18 which is the confluence point, the trailing material waiting upstream of the differential pinch roll 18 and in the vicinity of the differential pinch roll 18 By starting the running of , compared to the conventional method in which the trailing material starts running after the tail end of the preceding material reaches a predetermined stop position and stops, it is possible to shorten the downtime. . As a result, not only can production efficiency be improved, but also the maximum amount of loops in the entry-side looper 40 can be reduced, and the construction and maintenance costs of the entry-side looper 40 can be reduced.

In this embodiment, the trailing material starts running immediately after the trailing end of the leading material passes through the differential pinch roll 18, which is the confluence point, but this is not necessarily the case. For example, if the trailing material starts running at least before the trailing end of the leading material passes through the junction and stops at a predetermined stop position, the downtime can be shortened more than before.

However, from the viewpoint of enjoying a more remarkable effect, it is preferable that the leading end of the succeeding material stops at a predetermined stop position substantially at the same time as the tail end of the preceding material stops at the predetermined stop position. In one aspect, immediately after the tail end of the preceding material passes through the differential pinch roll 18 at the confluence point, the leading end waits upstream of the differential pinch roll 18 and in the vicinity of the differential pinch roll 18. To start running the running material and to keep the tail end of the leading material and the leading end of the trailing material close to each other and to run both of them to a predetermined stop position. However, it is not necessarily limited to this mode. For example, after the tail end of the preceding material passes through the confluence point, the following material starts traveling with a delay, but the traveling speed of the following material is higher than the traveling speed of the tail end of the preceding material. By increasing the running speed, the leading end of the succeeding material may be stopped at the predetermined stop position substantially at the same time as the tail end of the preceding material is stopped at the predetermined stop position.

The processing of steps S10, S12, steps S18 to S22, and step S36 corresponds to the first steel strip supply processing of the present invention, and the processing of steps S14, S16, steps S24 to S28, and step S38 corresponds to the first steel strip supply processing. This corresponds to the two-strip supply process.

Further, as described above, steel strips are delivered alternately from the first POR 12 and the second POR 14. Therefore, when the preceding material is delivered from the first POR 12, the succeeding material is delivered from the second POR 14, and the second POR 14 When the preceding material has been delivered, the succeeding material is delivered from the first POR 12 .

(Second embodiment)
FIG. 4 is an example of a schematic diagram showing the entry side facility 101 according to the second embodiment. In FIG. 4, the steel strip discharged from the first POR 12 is shown as the succeeding material. Further, the second embodiment is a form in which high carbon steel and high carbon steel are connected by the connecting device 16 . That is, if the connecting device 16 is a flash butt welder, it cannot weld high carbon steel to high carbon steel. Therefore, by inserting a common steel intermediate material between the preceding and following materials, the leading and following high-carbon steel materials and the common steel intermediate material are welded. It is.

The entry-side facility 101 differs from the entry-side facility 10 in that it is provided with a connecting material supply device 70 for inserting a connecting material 80 between the differential pinch roll 18 and the connection device 16. and the entry-side facility 101 are basically the same.

When the intermediate material supply device 70 is provided between the differential pinch roll 18 and the connection device 16, conventionally, the tail end of the preceding material and the tip of the intermediate material 80 are welded, and the tail end of the intermediate material 80 after welding is welded. After the end stops at a predetermined stop position, the trailing material whose tip is waiting upstream of the differential pinch roll 18 and in the vicinity of the differential pinch roll 18 starts running.

Therefore, in the second embodiment, after welding the tail end of the preceding material and the tip of the intermediate material 80 by the connecting device 16, before the tail end of the welded intermediate material 80 stops at a predetermined stop position, , to start the running of the trailing material.

In this way, by making the following material start running before the tail end of the intermediate material 80 welded to the preceding material stops at a predetermined stop position, the differential pinch roll 18 and the connecting device 16, the trailing end of the intermediate material 80 reaches a predetermined stop position and stops, and then the trailing material starts running. downtime can be shortened.

However, from the viewpoint of enjoying a more remarkable effect, after the tail end of the preceding material and the tip of the intermediate material 80 are welded by the connecting device 16, the tail end of the intermediate material 80 after welding is at a predetermined stop position. It is preferable that the leading edge of the trailing material is stopped at a predetermined stop position almost simultaneously with the stop.

As a mode thereof, for example, the following material travels so that the leading end of the trailing material reaches the vicinity of the rear end of the intermediate material 80 by the time the welding between the tail end of the leading material and the leading edge of the intermediate material 80 is completed. is started, and after the welding of the tail end of the preceding material and the tip of the intermediate material 80 is completed, the rear end of the intermediate material 80 and the tip of the trailing material are kept close to each other, and both are moved to a predetermined stop position. It may be an aspect. Also, when the welding between the tail end of the preceding material and the tip of the intermediate material 80 is completed, they start running ahead of them, and after that, the following material starts running, but the intermediate material, which is the preceding material, starts running. By making the running speed of the trailing material faster than the running speed of the tail end of the splicing material 80, the tip of the trailing material stops at the predetermined stop position almost at the same time as the tail end of the splicing material 80 stops at the predetermined stop position. It may be a mode to do.

(Third embodiment)
The third embodiment is also a form in which high-carbon steel and high-carbon steel are connected by the connecting device 16, but in that a laser beam welding machine is used as the connecting device instead of the flash butt welding machine, 2 embodiment. High carbon steel and high carbon steel can be welded by using a laser beam welding machine as the connecting device. Therefore, if the trailing material made of high carbon steel starts running at least before the tail end of the leading material made of high carbon steel passes through the confluence and stops at a predetermined stop position, Downtime can be shortened.

However, from the viewpoint of enjoying a more remarkable effect, after welding the tail end of the preceding material that is high carbon steel and the tip of the following material that is high carbon steel with a laser beam welding machine, the tail of the preceding material Preferably, the leading edge of the trailing material stops at the predetermined stop position substantially at the same time as the end stops at the predetermined stop position. In addition, in the third embodiment, unlike the second embodiment, it is not necessary to provide the intermediate material supply device 70, so compared to the second embodiment, the time required for welding the preceding material and the intermediate material 80 is shortened. In addition, the distance from the differential pinch roll 18 to the laser beam welding machine can be shortened, and the downtime can be greatly shortened.

In addition, since the laser beam welder has a higher welding speed than the flash butt welder, it is possible to further shorten the downtime compared to the first embodiment.

Thus, according to the third embodiment, it is possible to shorten downtime while welding high carbon steels.

According to the first to third embodiments described above, the following inventions can be provided.

The first invention is
A method of supplying steel strips to a connecting device (eg, connecting device 16) capable of connecting the tail end of a first steel strip (eg, preceding material) and the leading end of a second steel strip (eg, following material) and
A first steel strip supply process (for example, step S10, step S12, the processing of steps S18 to S22 and step S36);
A second steel strip supply process (for example, step S14, step S16, step S24 to step S28) for dispensing the second steel strip from the second dispensing device and stopping the tip of the second steel strip at the connecting device and the process of step S38);
has
The second steel strip supply process includes:
After the tail end of the first steel strip passes through the confluence of the pass line of the first steel strip and the pass line of the second steel strip (for example, the differential pinch roll 18) and the connection A process of running the second steel strip toward the connecting device so that the tip of the second steel strip passes through the confluence before stopping at the device (for example, the processing of step S16 ).

The second invention is
A steel strip supply device (e.g., first POR 12, second 2POR14),
a first dispensing device (e.g., first POR 12) for dispensing the first steel strip;
a second dispensing device (for example, a second POR 14) for dispensing a second steel strip;
The first steel strip is delivered from the first delivery device, the tail end of the first steel strip is stopped at the connection device, and the second steel strip is delivered from the second delivery device, a control device (e.g., control device 60) capable of executing control to stop the tip of the second steel strip at the connecting device;
with
The control device is
After the tail end of the first steel strip passes through the confluence of the pass line of the first steel strip and the pass line of the second steel strip (for example, the differential pinch roll 18) and the connection A process of running the second steel strip toward the connecting device so that the tip of the second steel strip passes through the confluence before stopping at the device (for example, the processing of step S16 ) can be executed.

According to the above first and second inventions, the tail end of the first steel strip passes through the confluence point of the pass line of the first steel strip and the pass line of the second steel strip. and before stopping at the connecting device, a process of running the second steel strip toward the connecting device so that the tip of the second steel strip passes the confluence. Therefore, it is possible to shorten the downtime compared to the conventional system in which the trailing material starts running after the trailing end of the preceding material reaches a predetermined stop position and stops.

According to the present invention, there is provided a steel strip supply method and supply apparatus capable of shortening the waiting time until a continuous steel strip in which a preceding material and a succeeding material are connected can be supplied to a continuous processing facility. can be done.

In particular, when the present invention is applied to steel grades such as S20C, SPHC, SPHE, S60C, and SK85 (previous material and subsequent material are the same material), there is no significant difference in downtime reduction between steel grades. The downtime, which was 133 seconds on average in the conventional example, was reduced to 116 seconds on average. That is, it was possible to shorten the downtime by approximately 17 seconds (approximately 13%).

12 1st POR
14 2nd POR
16 connection device 18 differential pinch roll (junction)
60 control device 121 first pass line 142 second pass line

Claims (2)

A method of supplying a steel strip to a connection device capable of connecting the tail end of a first steel strip and the tip end of a second steel strip, comprising:
a first steel strip supply process of dispensing the first steel strip from the first dispensing device and stopping the tail end of the first steel strip at the connecting device;
a second steel strip supply process of dispensing the second steel strip from the second dispensing device and stopping the tip of the second steel strip at the connecting device;
has
The second steel strip supply process includes:
When the tail end of the first steel strip passes through the confluence of the pass line of the first steel strip and the pass line of the second steel strip , the leading end waits upstream from the confluence. A method of supplying a steel strip, comprising a process of starting to run the second steel strip toward the connecting device. A steel strip supply device for connecting a tail end of a first steel strip and a tip end of a second steel strip, comprising:
a first dispensing device for dispensing the first steel strip;
a second dispensing device for dispensing a second steel strip;
The first steel strip is delivered from the first delivery device, the tail end of the first steel strip is stopped at the connection device, and the second steel strip is delivered from the second delivery device, a control device capable of executing control to stop the tip of the second steel strip at the connecting device;
with
The control device is
When the tail end of the first steel strip passes through the confluence of the pass line of the first steel strip and the pass line of the second steel strip , the leading end waits upstream from the confluence. A steel strip supply device capable of executing a process of starting the running of the second steel strip toward the connecting device.

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