JP2017170462A - Slab conveyance method, slab conveyance system and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress temperature decline of a slab during conveyance.SOLUTION: A slab conveyance method, which is a slab conveyance method for conveying a slab 70 manufactured in a steel mill 10 which is one of footholds to a heating furnace 61 via footholds such as the first yard 21 constituting a middle yard 50 or a rolling front yard 20 and the second yard 25, includes a foothold distribution replacement step for performing distribution replacement for recombining a slab group 71 comprising one or more slabs 70 based on the next conveyance destination of the slabs 70, on each foothold.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a slab transfer method, a slab transfer system, and a program.

Rolling of a slab manufactured at a steelmaking factory is performed, for example, in the following process. First, a slab is manufactured from molten steel in a steelmaking factory. Next, the manufactured slab is transported from the steelmaking factory to the rolling front yard and temporarily stored. Next, the slab stored in the rolling front yard is transferred to a heating furnace and heated, and then rolled by a hot rolling mill.
The following slab supply yard is disclosed in Patent Document 1 as a technique related to the conveyance of the slab in this process. In the slab supply yard of Patent Document 1, when the slab cast by the continuous casting apparatus is carried out to the slab carry-out yard, the slab is classified into a rolled slab and a cold piece storage slab. And slab width of unmaintained slab and rolling unit.

Japanese Patent Laid-Open No. 10-34222

Here, when the slab is conveyed from the steelmaking factory to the heating furnace, it is desirable that the temperature of the slab is not lowered as much as possible. This is because when the temperature of the slab is greatly reduced, heating in the heating furnace is required, the amount of fuel used in the heating furnace is increased, and the amount of carbon dioxide emission is further increased. In order to make it difficult to lower the temperature of the slab, it is important to keep the slab in a large unit during transportation.
However, in patent document 1, when carrying out to a slab carrying out yard, a slab is divided by slab width etc. Therefore, the slab is divided into small groups at an early stage of slab conveyance. Therefore, there is a possibility that the temperature of the slab is greatly lowered by the conveyance.

  This invention is made | formed in view of the above situations, and it aims at suppressing the fall of the temperature of the slab at the time of conveyance.

The slab transport method of the present invention is a slab transport method for transporting a slab manufactured at a steelmaking factory, which is one of bases, to a heating furnace via the other bases. And a base replacement step for performing replacement for rearranging a slab group composed of one or more slabs based on the next transport destination.
Another feature of the slab transport method of the present invention is that, in the base replacement step, the slab transport is performed when the slab group is dispensed at the base where there are a plurality of transport destinations capable of transporting the slab. The point is to perform the replacement based on the previous.
In addition, another feature of the slab transport method of the present invention is that, in the base replacement step, when the slab group is received, replacement is performed based on whether or not the slab is held at its own base. It is in.
Further, another feature of the slab transport method of the present invention is that in the base replacement step, replacement is further performed based on the temperature of the slab.
Further, another feature of the slab transport method of the present invention is that, in the base replacement step, a decrease in the temperature of the slab due to the replacement based on the temperature of the slab is a replacement based on the temperature of the slab. When the temperature is smaller than the temperature drop when not performed, the replacement is performed based on the temperature of the slab.
In addition, another feature of the slab transport method of the present invention is that the base is a moving facility that performs at least one of receiving the slab group and paying out the slab group, and replacing the slab group. In the base replacement step, when the slab group to be received and the slab group to be paid out do not stay even when replacement based on the temperature of the slab is performed, the temperature of the slab is On the basis of this, the mobile equipment is replaced.
Another feature of the slab transport method of the present invention is that the base includes an order designation base that pays out an order designation slab group in which an order of slabs constituting the slab group is designated, and the base In the replacement step, the replacement is performed in such a manner that the sequence-designated slab group is further formed at the sequence-designated base.
Another feature of the slab transport method of the present invention is that the base includes an order designation base that pays out an order designation slab group in which an order of slabs constituting the slab group is designated, and the base In the replacement step, in the base in a state where the replacement can be performed, the base is further up to the nearest order specified base that is the order specified base closest to the base through which the slab passes. Or only through the bases that cannot be replaced to form the order-designated slab group, and the nearest order-designated base cannot perform replacement to form the order-designated slab group. In this case, the replacement is performed so as to form the order-designated slab group received by the nearest order-designated base.
Another feature of the slab transport method according to the present invention is that in the base replacement step, the replacement for forming the order-designated slab group is performed by a plurality of transfers.
Another feature of the slab transporting method of the present invention is that the replacement is performed when the slab group is received at the base or when the slab group is discharged from the base. And sorting that is a recombination of the slab group performed in the base, and in the base replacement step, the last one time of replacement forming the order-designated slab group is the It is in the point performed by the said sorting performed when paying out a slab group.
Another feature of the slab transport method of the present invention is that, in the base replacement step, the base where the slab is transported next is replaced at the base where the replacement can be performed. In the case of a non-replaceable base that is incapable of being transferred, the one or more consecutive non-replaceable places when the base through which the slab is routed sequentially from the base where the slab is transported next. The replacement is based on the last transfer destination of the non-replaceable base at the base.
Further, another feature of the slab transport method of the present invention is that a transport facility for transporting the slab from the base to a different base is the transport destination next to the slab group transported by the transport facility. It is in the point further provided with the conveyance transfer step which replaces the said slab group based on the time which should arrive at a base.
Further, another feature of the slab transport method of the present invention is that, in the transport replacement step, one of the slab groups performs an overtaking to pass the other of the slab groups.
Further, another feature of the slab transport method of the present invention is that in the transport transfer step, the passing slab group and the passing slab group pass through different routes to perform the overtaking. In the point.
Another feature of the slab transport method of the present invention is that, in the transport transfer step, the slab group to be overtaken is placed at the base, and the slab group to be overtaken is transported by the transport facility. The point is to perform the overtaking.
Another feature of the slab conveying method of the present invention is that the slab group is in a state where the slabs are piled up.
The slab transport system of the present invention is a slab transport system for transporting a slab manufactured at a steelmaking factory that is one of the bases to a heating furnace via the other bases. And a base replacement means for performing replacement by rearranging a slab group composed of one or more slabs based on the next transport destination.
The program of the present invention is a program for controlling a slab transport system that transports a slab manufactured at a steelmaking factory that is one of the bases to a heating furnace via the other bases. The program for causing the computer to execute a base replacement step for performing replacement for rearranging a slab group composed of one or more slabs based on the next transport destination of the slab.

  According to this invention, the fall of the temperature of the slab at the time of conveyance can be suppressed.

It is a conceptual diagram of a distribution system. It is a block diagram of the computer system with which a physical distribution system is provided. It is a conceptual diagram of replacement, (a) is a conceptual diagram of sorting, (b) is a conceptual diagram of pile-up, and (c) is a conceptual diagram of overtaking. It is a figure showing a heat loss graph. It is the figure of the procedure of the replacement | exchange which forms a wide order slab group, (a) is a figure of the state before performing replacement, (b) is the figure of the state which performed the distribution according to width, (c) is wide It is a figure of the state in which the forward slab group was formed. It is a flowchart of an acceptance process and a payout process at a base. It is a figure explaining the example of the acceptance process in a 1st yard, (a) is a figure which shows the example of a receiving object slab, (b) is a figure which shows the state of the 1st yard after an acceptance process, (c) is It is a figure which shows the other state of the 1st yard after an acceptance process. It is a flowchart of the overtaking process in the transport facility. It is a figure explaining the example of the temperature change of a slab, (a) is a figure which shows the difference of the temperature change by a comparative example and this embodiment, (b) is a figure explaining the time to the cover clothes of a conveyance installation. It is.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
First, the physical distribution system 1 will be described with reference to FIG. FIG. 1 is a conceptual diagram of the physical distribution system 1. The physical distribution system 1 is an example of the slab conveyance system of the present invention, and realizes slab conveyance as described later.
The distribution system 1 includes a steel factory 10, a rolling front yard 20, a transport route 30, a transport facility 40, an intermediate yard 50, a heating furnace charging table 60, a heating furnace 61, and a hot rolling mill 62. Is provided.
The steelmaking factory 10 includes a converter and a continuous casting machine. The converter produces molten steel, and the continuous casting machine produces a slab 70 by cooling the molten steel produced in the converter into a plate shape or the like and cutting it into a predetermined length. The slab 70 manufactured in the steelmaking factory 10 is conveyed to the heating furnace 61 via the rolling front yard 20 and the like, heated, and then conveyed to the hot rolling mill 62 and rolled. Moreover, the steelmaking factory 10 is provided with a place where the manufactured slab 70 can be temporarily stored.

  The rolling front yard 20 is a place where the slab 70 conveyed to the heating furnace 61 is temporarily stored, and is provided in the vicinity of the heating furnace charging table 60. The rolling front yard 20 includes a first yard 21 and a second yard 25. The first yard 21 is wider than the second yard 25, and the slab 70 conveyed to the rolling front yard 20 is usually placed in the first yard 21 first. The second yard 25 is provided on the side near the heating furnace charging table 60 in the rolling front yard 20. When the time at which the slab 70 placed in the first yard 25 is transported to the heating furnace 61 approaches, the slab 70 is transported to the second yard 25 and is transported from the second yard 25 to the heating furnace charging table 60.

The transport route 30 is a route through which the slab 70 is transported by the transport facility 40, and includes a first route 31 and a second route 32. The first route 31 is a route connecting the steelmaking factory 10 and the first yard 21 of the rolling front yard 20. The first route 31 passes through an intermediate yard 50 between the steelmaking factory 10 and the rolling front yard 20. The second route 32 is a route connecting the intermediate yard 50 and the first yard 21 of the rolling front yard 20.
The transport facility 40 transports the slab 70 through the transport route 30. In the present embodiment, the transport facility 40 is a train, includes a tow vehicle 41 and a freight car 42, travels on the transport route 30, and transports the slab 70. The tow vehicle 41 is, for example, a diesel locomotive and pulls a freight car 42 connected to the tow vehicle 41. The freight car 42 is a vehicle on which the slab 70 can be placed. In the example illustrated in FIG. 1, the transport facility 40 includes one tow vehicle 41 and four freight cars 42, but the number may be other than this. A plurality of transport facilities 40 may operate on the transport route 30.
The transport facility 40 includes a first transport facility 40A and a second transport facility 40B. The first transport facility 40A operates the first route 31 to transport the slab 70 from the steelmaking factory 10 to the rolling front yard 20 or the intermediate yard 50. The second transport facility 40B operates the second route 32 to transport the slab 70 from the intermediate yard 50 to the rolling front yard 20.

Each of the first route 31 and the second route 32 includes an up route in a direction toward the rolling front yard 20 and a down route in a direction returning from the rolling front yard 20. The first route 31 has a plurality of upstream routes, and the first transport facility 40A can pass another first transport facility 40A in the first route 31. On the other hand, the second route has one up route, and the second transport facility 40B cannot pass the other second transport facility 40B in the second route 32.
The transport facility 40 may be a conveyor, a vehicle (for example, an electric car, a train, or a trailer).

The intermediate yard 50 is a place where a part of the slab 70 being conveyed from the steelmaking factory 10 to the rolling front yard 20 can be temporarily stored, and is located between the steelmaking factory 10 and the rolling front yard 20. In the present embodiment, one intermediate yard 50 is provided, but a plurality of intermediate yards 50 may be provided.
The heating furnace charging table 60 is a transport line that transports the slab 70 transported from the second yard 25 to the heating furnace 61.
The heating furnace 61 heats the slab 70 to a predetermined temperature. There are four heating furnaces 61, for example, a first heating furnace 61A, a second heating furnace 61B, a third heating furnace 61C, and a fourth heating furnace 61D. Each heating furnace 61 is disposed at a position adjacent to the heating furnace charging table 60. When the heating furnace charging table 60 reaches the heating furnace 61 where the slab 70 is to be transported, the slab 70 is put into the heating furnace 61. Note that the heating furnace 61 is not limited to four, and may be any number.
The hot rolling mill 62 rolls the slab carried from the heating furnace 61. The hot rolling mill 62 includes a plurality of rolling roll sets including a pair of rolling rolls. And a rolling roll is rotated and a slab is rolled by passing a slab between a pair of rolling rolls in each rolling roll set.

Next, a computer system included in the physical distribution system 1 will be described with reference to FIG. FIG. 2 is a block diagram of a computer system included in the physical distribution system 1.
The physical distribution system 1 includes a steelmaking management device 100, a heating and rolling management device 101, an intermediate yard management device 102, a rolling front yard management device 103, and a transfer facility management device 104.
The steelmaking management device 100 manages the schedule of the slab 70 manufactured at the steelmaking factory 10, the slab 70 temporarily stored in the steelmaking factory 10, the transport destination and transport time of the slab 70, and the like.

The hot rolling management device 101 manages the schedule of the slab 70 heated by the heating furnace 61 and the slab 70 rolled by the hot rolling mill 62, and controls the heating furnace 61 and the hot rolling mill 62.
The intermediate yard management device 102 manages the slab 70 stored in the intermediate yard 50, the transport destination and transport time of the slab 70, and the like.
The rolling front yard management device 103 manages the slab 70 stored in the rolling front yard 20, the transport destination and transport time of the slab 70, and the like.
The transport facility management device 104 manages the operation of the transport facility 40.

  The steelmaking management device 100 includes a storage device such as a CPU (Central Processing Unit), a memory, and a hard disk. Similarly, the heating and rolling management device 101, the intermediate yard management device 102, the rolling front yard management device 103, and the transfer facility management device 104 each include a storage device such as a CPU, a memory, and a hard disk. The program stored in the storage device is expanded in the memory, and the functions of the respective devices are realized by the CPU executing the program expanded in the memory. Note that data acquired from other devices or the like is used as necessary to realize the functions of each device.

Next, the flow of conveying the slab 70 will be described.
The slab 70 manufactured at the steelmaking factory 10 is conveyed to the first yard 21, the second yard 25 or the intermediate yard 50 of the rolling front yard 20. The slab 70 conveyed to the intermediate yard 50 is stored in the intermediate yard 50 for a predetermined period, and then conveyed to the first yard 21 or the second yard 25 of the rolling front yard 20. The slab 70 conveyed to the first yard 21 is conveyed to the second yard 25. The slab 70 conveyed to the second yard 25 is conveyed from one of the first heating furnace 61A to the fourth heating furnace 61D, heated, and conveyed to the hot rolling mill 62.
In principle, the flow of the slab 70 being conveyed to the hot rolling mill 62 is determined for each slab 70 by the steelmaking management device 100 when the slab 70 is manufactured at the steelmaking factory 10. This information is shared by each device of the computer system of the physical distribution system 1. However, according to the amount of the slab 70 in the intermediate yard 50, the degree of congestion of the transport route 30, and the like, a device such as the transport facility management device 104 changes the transport flow of the slab 70 during the transport of the slab 70. Sometimes.

Next, a method for managing the slab 70 when the slab 70 is transported by the distribution system 1 will be described.
In the physical distribution system 1, the conveyance of the slab 70 is managed with a slab group 71 including one or more slabs 70 as a unit. In this embodiment, one slab group 71 is managed as a state in which the slabs 70 are stacked and stacked. For example, in the transport facility 40, one freight car 42 is loaded with one slab group 71 in a piled state. Further, in the place where the slab 70 of the steelmaking factory 10 is located, the first yard 21 and the second yard 25 of the rolling front yard 20, and the intermediate yard 50, the slab group 71 is arranged and managed at a predetermined location, and the slab group 71 Each time it is transported to the next transport destination.
However, the configuration of the slab group 71 does not always change from the steel factory 10 to the second yard 25. For example, when the transport destination of the slab 70 constituting the slab group 71 is different or the configuration of the slab group 71 received by the base of the transport destination of the slab group 71 is determined, replacement that is a rearrangement of the slab group 71 is performed. There is a need to do.

  Next, the base and the moving equipment will be described. The base is a place where the slab 70 can be temporarily stored or retained. The steelmaking factory 10, the rolling front yard 20 and the intermediate yard 50 can be said to be bases. Each base is provided with one or more moving facilities for receiving the slab group 71, dispensing the slab group 71, and replacing the slab group 71. The mobile equipment is managed by an apparatus corresponding to the base equipped with the mobile equipment. For example, the rolling front yard management device 103 which is a device corresponding to the rolling front yard 20 manages the operation of the moving equipment of the rolling front yard 20 and the like. Further, the intermediate yard management device 102 which is a device corresponding to the intermediate yard 50 manages the operation of the moving equipment in the intermediate yard 50 and the like. The same applies to the other bases.

In this embodiment, a crane is used for the moving equipment. Although the 1st yard 21 and the 2nd yard 25 which constitute rolling front yard 20 can also be said to be a base, respectively, 1st yard 21 and 2nd yard 25 share one crane. However, each of the first yard 21 and the second yard 25 may include a crane.
The bases of this embodiment include a base having a plurality of transport destinations that can transport the slab 70. For example, conveyance destinations capable of conveying the slab 70 in the steelmaking factory 10 are the first yard 21, the second yard 25, and the intermediate yard 50 of the rolling front yard 20. Similarly, the conveyance destination in the intermediate yard 50 is the first yard 21 and the second yard 25 of the rolling front yard 20. The transport destination in the second yard 25 is the first to fourth heating furnaces 61.

Next, replacement will be described. The replacement is to rearrange the slab group 71. The replacement includes changing the arrangement (order) of the slab groups 71 without changing the configuration of the slab groups 71 itself.
The transfer includes sorting, pile-up, and overtaking.
Sorting is performed when the slab group 71 is received at the base such as the first yard 21 or when the slab group 71 is paid out from the base such as the first yard 21 or the like. The group 71 is rearranged. Further, when the slab group 71 is paid out from the first yard 21 to the second yard 25, the rearrangement of the slab group 71 performed simultaneously with the payout is also sorting.
An example of sorting when receiving the slab group 71 will be described with reference to FIG. FIG. 3A is a conceptual diagram of sorting. In FIG. 3A, the slab group 71 to be received in the first yard 21 is conveyed to the first yard 21 by the freight car 42. The slab group 71 mounted on the freight car 42 is composed of four slabs of a first slab 70 to a fourth slab 70 in order from the top.
In the first yard 21, there are three places from the first place 22A to the third place 22C. One slab group 71 can be stored in each place. In the first yard 21, it is necessary to form a slab group 71 composed of the first slab 70 and the second slab 70 and a slab group 71 composed of the third slab 70 and the fourth slab 70. .

At this time, the crane in the first yard 21 moves the slab group 71 of the freight car 42 to the first yard 21. The crane of this embodiment shall be able to move slabs one by one. Therefore, the crane in the first yard 21 first places the first slab 70 and the second slab 70 of the freight car 42 in the second storage 22B in order. Next, the crane in the first yard 21 places the third slab 70 and the fourth slab 70 of the freight car 42 in the first place 22A in order.
Thus, sorting is performed simultaneously with acceptance of the slab group 71, and the slab group 71 of the freight car 42 is rearranged into two slab groups 71. The crane moves sequentially from the slab 70 on the slab group 71 of the freight car 42. Therefore, when the slab 70 is placed in the first yard 21, the order of the slabs 70 of the slab group 71 is opposite to the order of the slabs 70 of the slab group 71 when loaded on the freight car 42.
In addition, although the crane of this embodiment shall move a slab one sheet at a time, the logistics system 1 may use the crane which can move several slabs simultaneously.

The Yamanori is a rearrangement of the slab group 71 performed in a base such as the first yard 21.
With reference to FIG.3 (b), the example of the lap of the slab group 71 is demonstrated. FIG. 3B is a conceptual diagram of piled up. A slab group 71 composed of four slabs, a first slab 70 to a fourth slab 70, is placed in order from the top in the first yard 22 </ b> A of the first yard 21. And in the 1st yard 21, it is necessary to form the slab group 71 which consists of the 1st slab 70 and the 2nd slab 70, and the slab group 71 which consists of the 3rd slab 70 and the 4th slab 70. .
At this time, the crane in the first yard 21 moves the first slab 70 and the second slab 70 of the first storage site 22A to the second storage site 22B in order. Next, the crane in the first yard 21 moves the third slab 70 and the fourth slab 70 of the first storage site 22A to the third storage site 22C in order.
In this way, the mountain rolling is performed, and the slab group 71 of the first parking lot 22A is rearranged into two slab groups 71.

Overtaking is to change the order in which the slab group 71 arrives at the destination site using the transfer facility 40.
An example of overtaking the slab group 71 will be described with reference to FIG. FIG. 3C is a conceptual diagram of overtaking. Of the two upstream routes 31A and 31B on the first route 31, the transport facility 40 of one upstream route 31A departs from the steelmaking factory 10 first, and the transport facility 40 of the other upstream route 31B departs later doing.
At this time, the transport facility 40 on the upstream route 31A stops or decelerates, and the transport facility 40 on the upstream route 31B passes the transport facility 40 on the upstream route 31A.
Thus, the overtaking is performed, and the order of arrival at the rolling front yard 20 that is the conveyance destination of the slab group 71 can be changed.

Here, the overtaking using the transport route 30 (first route 31) has been described, but the intermediate yard 50 may be used for overtaking.
In the first method of overtaking using the intermediate yard 50, the slab group 71 to be overtaken is temporarily placed in the intermediate yard 50 among the slab groups 71 transported by the transport facility 40 on the first route 31. The overtaking slab group 71 is conveyed to the rolling front yard 20 as it is through the first route 31.
In the second method of overtaking using the intermediate yard 50, the slab group 71 to be overtaken of the slab group 71 transported by the transport facility 40 on the first route 31 is transferred to the second route 32 via the intermediate yard 50. Moving. The slab group 71 moved to the second route 32 and placed on the transport facility 40 is transported to the rolling front yard 20 over the slab group 71 to be overtaken on the first route 31. In this way, overtaking is performed.
When the slab group 71 of the transport facility 40 on the first route 31 is placed in the intermediate yard 50 or moved to the transport facility 40 on the second route 32, a crane in the intermediate yard 50 is used.

Next, heat loss due to replacement will be described with reference to FIG. FIG. 4 is a diagram illustrating a heat loss graph. A heat loss graph is a graph showing the heat loss of the slab 70 which arises by performing replacement. The horizontal axis of the thermal loss graph represents a process until the slab 70 is conveyed from the steelmaking factory 10 to the hot rolling mill 62. Therefore, time has elapsed in the subsequent process (right side of the horizontal axis) compared to the previous process (left side of the horizontal axis). The vertical axis of the heat loss graph represents heat loss due to one replacement.
The heat loss is a decrease in the temperature of the slab 70. When the heat loss is large, the temperature of the slab 70 is greatly lowered, and the heating furnace 61 needs to heat the slab 70 correspondingly. Accordingly, the amount of fuel used in the heating furnace 61 is increased, and the amount of carbon dioxide emission is further increased. For this reason, it is desirable that the heat loss be small.

As can be seen from FIG. 4, the heat transfer due to one transfer is larger as the replacement is performed in the previous step. This is due to the following reason. First, in the replacement, the slab 70 of the slab group 71 is moved by a crane except for overtaking using the transport route 30. During this movement, the temperature of the slab 70 decreases, but the temperature of the slab 70 decreases greatly as the temperature of the slab 70 increases. For this reason, the heat loss when the replacement is performed once increases as the previous step is performed.
Secondly, when sorting or pile-up is performed as replacement, the number of slabs 70 constituting the slab group 71 decreases and the height of the slab group 71 often decreases. Therefore, the volume of the slab group 71 decreases, and the surface area per volume tends to increase. Therefore, the temperature of the slab group 71 is likely to be lowered by performing sorting or stacking. Here, since the temperature of the slab 70 is higher in the previous process, the temperature is likely to decrease. For this reason, the heat loss when the replacement is performed once increases as the previous step is performed.
Therefore, it is desirable that the replacement be performed in a later process as much as possible.

Next, the characteristics of heat loss for each of sorting, stacking, and overtaking will be described.
Sorting is rearrangement of the slab group 71 performed at the same time as acceptance at the base or paying out from the base. When the slab group 71 is received or paid out from the base, for example, the slabs 70 of the slab group 71 are moved one by one using the crane at the base. Sorting is performed simultaneously with this movement. Therefore, when the slab group 71 is received at the base or paid out from the base, there is no difference in the heat loss of the slab 70 when comparing the case of sorting and the case of not sorting.
However, since the slab groups 71 are separated by sorting, the height of the stacked slab groups 71 is lowered, and the temperature of the slab groups 71 after sorting is likely to decrease. Therefore, heat loss increases after sorting.
For this reason, it is desirable to perform sorting in a later process.

Yamanen is a rearrangement of the slab group 71 performed in the base. The Yamanari is performed separately from the acceptance of the slab group 71 to the base or the payout from the base. The heat loss when the slab 70 is moved increases as the temperature of the slab 70 increases. Therefore, it is desirable to carry out the pile-up in a later process so that the heat loss is reduced.
In order to carry out mountain rolling, unlike sorting, it is necessary to move the slab 70 with a crane only for mountain rolling. Therefore, comparing the case where the replacement of the slab group 71 is carried out with piles and the case where the slab groups 71 are carried out with sorting, the heat loss becomes larger as a whole when piled up. Therefore, if the same replacement is performed, it is preferable to perform sorting by sorting rather than stacking because heat loss is reduced as a whole.

Of the overtaking, first, overtaking using the transport route 30 will be described. In the overtaking using the transport route 30, there is no need to move the slab group 71 to another transport facility 40 or to place the slab group 71 in the intermediate yard 50, so no heat loss occurs.
Next, overtaking using the intermediate yard 50 will be described. When the overtaken slab group 71 is placed in the intermediate yard 50 from the transport facility 40, heat loss occurs when the crane moves the overtaken slab group 71 to the intermediate yard 50. On the other hand, no heat loss occurs in the overtaking slab group 71.
When the overtaking slab group 71 moves from the transfer facility 40 of the first route 31 to the transfer facility 40 of the second route 32 via the intermediate yard 50, the crane moves the overpassing slab group 71 of the second route 32. Heat loss occurs when moving to the transport facility 40. On the other hand, heat loss does not occur in the slab group 71 to be overtaken.

Next, the purpose of performing replacement will be described.
The first purpose of the replacement is to classify the slab 70 for each transport destination of the slab 70.
For example, in the steelmaking factory 10, the slab group 71 needs to be classified as follows. First, it is a slab group 71 whose conveyance destination is the first yard 21 of the rolling front yard 20. Second, it is a slab group 71 whose conveyance destination is the second yard 25 of the rolling front yard 20. Thirdly, the slab group 71 has a transport destination of the intermediate yard 50. Furthermore, it is necessary to classify the slab group 71 for each upstream route of the two first routes 31.
In the intermediate yard 50, the slab group 71 needs to be classified as follows. First, it is a slab group 71 whose conveyance destination is the first yard 21 of the rolling front yard 20. Second, it is a slab group 71 whose conveyance destination is the second yard 25 of the rolling front yard 20. Third, the slab group 71 is fastened to the intermediate yard 50. Furthermore, it is necessary to classify the slab group 71 for each of the first route 31 and the second route 32. In addition, it is necessary to classify the slab group 71 for each upstream route of the two first routes 31.

  The transport destination of the slab 70 is, for example, whether the planned track time is a predetermined time or more, whether the tying material or surplus material, and which heating furnace from the first heating furnace 61A to the fourth heating furnace 61D of the transport destination 61 or the like. The track time is the time from when the slab 70 is manufactured at the steelmaking factory 10 until it is transported to the heating furnace 61. The tying material is a slab 70 tyed to the steel material order. The surplus material is a slab 70 that is not tied to the steel material order. This is determined by the steelmaking management device 100 when the slab 70 is manufactured, for example. However, it may be changed by other apparatuses such as the rolling front yard management apparatus 103 while the slab 70 is being conveyed.

The second purpose of replacement is to classify the slab group 71 based on the physical attributes of the slab 70. The physical attributes of the slab 70 include the size (width, length, and thickness) of the slab 70, the temperature of the slab 70, the material of the slab 70, and the tensile strength of the slab 70.
There are the following two types of replacement for the second purpose. The first is to allow the slab group 71 to be formed. The slab group 71 is a state in which the slabs 70 are piled up as described above. Therefore, if the difference in width and length of the slab 70 is large, the slab group 71 cannot be formed because it becomes unstable when stacked. Therefore, it is necessary to form the slab group 71 using the slab 70 in which the width and length of the slab 70 are within a predetermined range so that the slab group 71 can be formed.
The second is to classify the slab 70 based on the temperature of the slab 70 so that the heat loss of the slab 70 is reduced. For example, if the same number of 20-degree slabs 70 and 700-degree slabs 70 are mixed in one slab group 71, the slab 70 becomes an intermediate 360 degrees. Therefore, the temperature of 700 degree slab falls to about 360 degree, and a large heat loss occurs. In order to prevent such heat loss, the slabs 70 are classified so that the temperature of the slabs 70 constituting the slab group 71 falls within a predetermined range. By classifying the slabs 70 on the basis of the temperature of the slabs 70, the slab group 71 is composed of slabs 70 that fall within a temperature within a predetermined range, and heat loss can be suppressed.

In addition, it is not essential to replace the slab 70 based on the temperature of the slab 70, and is performed when the first temperature replacement condition and the second temperature replacement condition are satisfied.
The first temperature replacement condition is that the physical distribution of the slab 70 is not hindered. That is, the first temperature replacement condition is that the slab group 71 to be received and the slab group 71 to be paid out do not stay even when replacement based on the temperature of the slab 70 is performed. This is because if the distribution of the slab 70 is obstructed, the slab 70 is not carried into the hot rolling mill 62, which may hinder the operation.
The second temperature replacement condition is that the temperature decrease of the slab 70 due to the replacement based on the temperature of the slab 70 is smaller than the temperature decrease when the replacement based on the temperature of the slab 70 is not performed. As already explained, the temperature of the slab 70 is lowered by the replacement. Therefore, it is necessary to compare the decrease in the temperature of the slab 70 due to the replacement based on the temperature of the slab 70 and the decrease in the temperature when the replacement based on the temperature of the slab 70 is not performed.

The third purpose of the replacement is to change the arrangement of the slabs 70 in the order in which the bases accept the slabs 70. For example, the arrangement of the slabs 70 is determined by whether or not they are urgent materials. The urgent material is a slab 70 whose number of days until delivery is less than a threshold value.
The third purpose of the replacement includes rearranging the slab group 71 into an order-designated slab group as described below.
The slab group 71 in the second yard 25 needs to be a wide order slab group that is a slab group 71 in which the slabs 70 are piled so that the top slab 70 is the widest and the width becomes narrower as it goes down. There is. This is because the hot rolling mill 62 performs rolling in order from the wide slab 70. That is, when the slab group 71 placed in the second yard 25 is a wide order slab group, the slab 70 on the wide order slab group is sequentially discharged to the heating furnace charging table 60. Therefore, the hot rolling mill 62 passes through the heating furnace 61 and sequentially transports from the wide slab 70. For this reason, the slab group 71 of the second yard 25 needs to be a wide order slab group.
A slab group in which the order of the slabs 70 constituting the slab group 71, such as the wide order slab group, is defined is referred to as an order designation slab group. Further, a base where an order designation slab group needs to be formed at least when paying out is called an order designation base, as in the second yard 25.

Next, a replacement procedure for forming the wide order slab group will be described.
As a first procedure, slab groups are replaced by width to form a plurality of slab groups classified by width. This replacement is referred to as width-specific replacement.
In the example shown in FIG. 5A, the slab group 71A includes a first slab 70, a second slab 70, and a third slab 70 in order from the top, and the slab group 71B includes the fourth slab 70 and the fourth slab 70 in order from the top. It is composed of a fifth slab 70 and a sixth slab 70. The first slab 70 and the fifth slab 70 have the same width and are wider than other slabs. The second slab 70 and the fourth slab 70 have the same width and are narrower than the other slabs. The third slab 70 and the sixth slab 70 have the same width, are narrower than the first slab 70 and the fifth slab 70, and wider than the second slab 70 and the fourth slab 70. Note that the difference in width between the first to sixth slabs 70 is within the range in which the slab group 71 can be formed.
When the replacement by width is performed from the state of FIG. 5A, as shown in FIG. 5B, a slab group 71C, a slab group 71D, and a slab group 71E are formed. The slab group 71 </ b> C includes a wide first slab 70 and a fifth slab 70. The slab group 71D includes a third slab 70 and a sixth slab 70 having a medium width. The slab group 71E includes a narrow second slab 70 and a fourth slab 70.

As a second procedure, a wide order slab group is formed by moving one slab 70 from a plurality of slab groups 71 classified by width in order of width.
In the state of FIG. 5B, the slab 70 is moved one by one from the slab group 71E, the slab group 71D, and the slab group 71C one by one in order, and as shown in FIG. 71F and slab group 71G are formed.
In this way, the replacement for forming the wide order slab group is performed.
In FIG. 5, the slab 70 is divided into three slab groups 71 having a wide width, a narrow width, and a medium width. However, the slab 70 may be further finely divided according to the width. Further, normally, when performing replacement in which the slabs 70 are moved one by one from the plurality of slab groups 71 classified by width in the order of narrowness, the replacement is performed for each transport destination at the same time.

Next, with reference to FIG. 6, the slab group acceptance and payout processing at the base will be described. FIG. 6 is a flowchart of slab group acceptance and payout processing at the site. Note that the processing in FIG. 6 is the same at all sites. Moreover, the process of FIG. 6 is an example of the base replacement step performed by the base replacement means of the present invention.
The processing in FIG. 6 is processing focused on one slab group 71 carried into the base, and includes processing for accepting the slab group 71, waiting for instructions, and payout processing. When the slab group 71 is replaced and becomes a plurality of slab groups 71 in the receiving process, a payout process is performed for each slab group 71. The acceptance process is from step S100 to S104 in FIG. 6, the instruction waiting is step S105, and the payout process is from step S106 to S110.
When another slab group 71 arrives at the base after a certain slab group 71 has arrived at the base after it has arrived at the base, the processing of FIG. 6 for the other slab group 71 starts.

In step S <b> 100, the administrator of the distribution system 1 (hereinafter simply referred to as an administrator) determines whether or not replacement for the arrived slab group 71 is necessary. Whether or not transfer is necessary is based on the first purpose (for each transport destination), second purpose (physical attribute) and third purpose (order of acceptance at the base) of the above-mentioned transfer, Judgment is made as follows.
First, when the slab group 71 that has arrived at its own base contains a slab 70 that is scheduled to remain at its own base for a certain period of time and a slab 70 that is scheduled to be transported without staying at its own base, replacement is performed in order to separate the two. It is judged necessary.
In addition, when the slabs 70 having a predetermined temperature difference are mixed in the slab group 71 that has arrived at the base, and when the first temperature replacement condition and the second temperature replacement condition are satisfied, the temperature of the slab 70 Based on the above, it is determined that it is necessary to replace the slab 70.

In addition, when it is necessary to form an order-designated slab group at its own site and the conditions for the next-order-specific slab group to be described below are satisfied, the sort by width that is part of the order that forms the order-designated slab group Is determined to be necessary.
When the own site is the order specified site, it is determined that it is necessary to form the order specified slab group of the own site. However, even if the local site is not the sequence designation site, if the first sequence replacement condition and the second sequence replacement condition are satisfied, it is determined that the sequence designation slab group needs to be formed.
The first order reassignment condition is that the nearest order designation base that is the nearest order designation base when the base through which the slab 70 is routed is followed in order, or the order designation slab group is formed. It is only via a base that is in a state where it cannot be transferred.
The second order replacement condition is a state in which the nearest order specification base cannot perform the replacement to form the order specification slab group.

As an example, consider a rolling front yard 20. The second yard 25 of the rolling front yard 20 has a small area. Moreover, since the crane of the 2nd yard 25 needs to pay out the slab 70 to the heating furnace charging table 60 at a short interval from the 2nd yard 25, there is no room for replacement in the 2nd yard 25. Therefore, the second yard 25 is a non-replaceable base that is a base that cannot be replaced. Accordingly, the second yard 25 satisfies the second order replacement condition.
Further, if the local base is the first yard 21, the slab 70 of the first yard 21 is paid out to the second yard 25, and therefore it can be said that the first order replacement condition is satisfied. Therefore, in the 1st yard 21, it is necessary to perform replacement which forms an order specification slab group.

The distribution condition by width is that the number of replacements does not increase when the distribution by width is performed together with other replacements during the receiving process of the slab group 71. Moreover, the one where the height of the slab group 71 when performing the change by width is better. For example, a height where eight or more slabs 70 are overlapped is desirable.
When it is determined in step S100 that replacement is necessary, this necessary replacement is performed in steps S101, S103, and S104. Further, the necessary replacement is collectively performed so that the number of replacements is minimized. For example, replacement is performed in order to separate the slab 70 that is scheduled to remain at its own site for a certain period of time and the slab 70 that is scheduled to be transported without staying at its own site, and the replacement based on the temperature of the slab 70 is performed once. If you can do this, you can reduce heat loss by performing a single replacement.

  Here, with reference to FIG. 7, the example of the replacement | exchange in an acceptance process is demonstrated. It is assumed that the own base is the first yard 21 and the slab group 71 shown in FIG. The slab group 71 of FIG. 7A is stacked with a first slab 70, a second slab 70, a third slab 70, and a fourth slab 70 in order from the top. It is assumed that the first and second slabs 70 are to be fastened to the first yard 21 and the third and fourth slabs are to be transported without being fastened to the first yard 21. Further, the first slab 70 and the third slab 70 are cold pieces having a low temperature, and the second slab 70 and the fourth slab 70 are hot pieces having a high temperature. Note that the cold piece and the hot piece have a predetermined temperature difference. When the slab group 71 shown in FIG. 7 (a) arrives at the first yard 21, the first yard 22A and the second yard 22B of the first yard 21 are empty, and the third yard 22C and the fourth yard 22D. It is assumed that another slab group 71 is placed in.

In the example of FIG. 7, it is assumed that the distribution condition by width is not satisfied. For this reason, the distribution by width is not performed.
On the other hand, if the first temperature replacement condition and the second temperature replacement condition are satisfied, it is necessary to classify the slab 70 into the slab 70 to be retained and the slab 70 not to be retained, and to classify based on the temperature. Therefore, the first to fourth slabs 70 need to be replaced with four different slab groups 71. However, there are only two free places, the first place 22A and the second place 22B.
At this time, the administrator determines to give priority to the replacement classified into the slab 70 to be retained at the own base and the slab 70 to be retained at the own base, and the replacement to be classified into the slab 70 to be retained at the local base and the slab 70 not to be retained. An instruction is given to the rolling front yard management device 103 so as to be performed. By this instruction, the crane in the rolling front yard 20 lowers the first slab 70 of the transport facility 40 to the first place 22A, and then moves the second slab 70 of the transport facility 40 to the first slab 70 of the first place 22A. Take it down. Further, the crane of the rolling front yard 20 lowers the third slab 70 of the transport facility 40 to the second storage 22B, and then places the fourth slab 70 of the transport facility 40 on the third slab 70 of the second storage 22A. take down. Thus, the first yard 21 is in the state shown in FIG.
This replacement is a sorting in which the slab 70 is rearranged simultaneously when the slab group 71 is received at the base.

Next, it is assumed that the slab group 71 in the third yard 22C and the fourth yard 22D in the first yard 21 is paid out. Thereby, the 3rd place 22C and the 4th place 22D will be in the vacant state.
At this time, the manager issues an instruction to the rolling front yard management device 103 so as to replace the slab group 71 based on the temperature. By this instruction, the crane in the rolling front yard 20 moves the second slab 70 of the first storage site 22A to the third storage site 22C, and then moves the fourth slab 70 of the second storage site to the fourth storage site 22D. Thus, the first yard 21 is in the state shown in FIG. 7C, and is classified into the slab 70 to be kept at its own base and the slab 70 to be not fastened, and further classified based on the temperature.
This replacement is a hill-rolling that is a rearrangement of the slab group 71 performed in the base.

Returning to FIG. 6, the description of the acceptance process will be continued.
In step S100, the manager advances the process to step S101 when replacement of the arrived slab group 71 is necessary, and advances the process to step S102 when replacement is not necessary. When the own base is a non-replaceable base, the necessary replacement has been completed up to the previous base, so the administrator advances the process to step S102.
In step S <b> 101, the administrator issues an instruction to the device corresponding to the own base so that the sorting is performed together with the acceptance. In accordance with this instruction, the crane at its own site performs sorting together with acceptance. In the example of FIG. 7, the first yard 21 is brought into the state of FIG. 7B by step S101.
In step S <b> 102, the administrator issues an instruction to the device corresponding to its own base so as to perform acceptance. In response to this instruction, the crane at its own site accepts and the slab group 71 transported to its own site is placed at its own site. At this time, no replacement is performed.

In step S103, the administrator determines whether or not replacement remains, that is, whether or not all necessary replacements determined in step S100 have been completed. The administrator proceeds to step S104 when replacement remains, and proceeds to step S105 when replacement does not remain. In the example of FIG. 7B, since the replacement based on the temperature remains, the administrator determines that the replacement remains.
In step S <b> 104, the administrator issues an instruction to the device corresponding to his / her own base so as to carry out the mountain rolling once. In response to this instruction, the crane at its own site carries out the mountain rolling once. In the example of FIG. 7, the first yard 21 changes from the state of FIG. 7B to the state of FIG.

  In step S <b> 105, the manager refers to the output of the device corresponding to the local site, and waits until a payout command is issued for the slab group 71 placed at the local site. For the slab group 71 scheduled to remain at its own base for a certain period, a payout command is issued after the certain period has elapsed. Also, a payout command is immediately issued to the slab group 71 scheduled to be transported to the base without staying for a certain period.

  In step S <b> 106, the manager determines whether or not replacement is required for the slab group 71 for which the payout command has been issued. Whether or not replacement is necessary is determined as follows based on the first, second, and third purposes of the replacement.

First, when slabs 70 having different next transport destinations coexist in the slab group 71 for which a payout command has been issued, replacement is necessary to divide the slab 70 according to the next transport destination, that is, for each transport destination. It is judged that.
However, when the base that is the next transport destination of the slab 70 is a non-replaceable base, it is determined that the replacement needs to be performed in consideration of the next transport destination of the base that becomes the next transport destination of the slab 70. The More specifically, when the base that is the next transport destination of the slab 70 is a non-replaceable base, it is determined that replacement is necessary as follows. That is, the last transfer of one or more consecutive non-replaceable bases is not possible when the base through which the slab 70 is transported next (the non-replaceable base) is followed in turn. It is necessary to transfer based on the next transport destination of the base.

As an example, consider a rolling front yard 20. As described above, the second yard 25 is a non-transferable base. The next transport destination of the second yard 25 is the heating furnace 61. In the second yard 25, the slab group 71 needs to be formed for each of the first heating furnace 61A to the fourth heating furnace 61D.
Therefore, in the first yard 21, it is necessary to replace the first heating furnace 61A, which is the next transfer destination of the second yard 25, based on each fourth heating furnace 61D.

  In addition, when the slab group 71 for which a payout command has been issued includes slabs 70 having a temperature difference of a predetermined value, and when the first temperature replacement condition and the second temperature replacement condition are satisfied, the temperature of the slab 70 Based on the above, it is determined that it is necessary to replace the slab 70. Note that the first temperature replacement condition was not satisfied during the acceptance process, but the crane operation may be reduced and the first temperature replacement condition may be satisfied during the payout process.

In addition, when it is necessary to form an order-designated slab group at its own site, it is determined that a change other than that performed at the time of receiving the slab group 71 is necessary among the exchanges that form the order-designated slab group. Is done.
For example, in the example of FIG. 5, when the slab group 71 is received and the distribution by width shown in FIG. 5B is performed, in step S <b> 106, the order-designated slab group shown in FIG. 5C is formed. It is determined that replacement is necessary. On the other hand, when the slab group 71 is accepted, if the distribution condition by width is not satisfied and the distribution by width shown in FIG. 5B is not performed, in step S106, the distribution by width shown in FIG. It is determined that replacement and replacement for forming the order-designated slab group shown in FIG.
When it is determined in step S106 that replacement is necessary, the necessary replacement is performed in steps S107, S108, and S109. Further, the necessary replacement is collectively performed so that the number of replacements is minimized.

Returning to FIG. 6, the explanation of the payout process will be continued.
In step S106, the manager advances the process to step S107 when replacement is necessary for the slab group 71 for which the payout command has been issued, and advances the process to step S110 when replacement is not necessary. When the own base is a non-replaceable base, the necessary replacement has been completed up to the previous base, and therefore the administrator proceeds with the process to step S110.
In step S107, the manager determines whether or not the remaining number of transfers is two or more. The administrator advances the process to step S108 when the remaining number of transfers is two or more, and advances the process to step S109 when the remaining number of transfers is one.
In step S <b> 108, the administrator issues an instruction to the device corresponding to his / her base so as to carry out the mountain rolling once. In response to this instruction, the crane at its own site carries out the mountain rolling once. In the example of FIG. 5, when the slab group 71 is not transferred at the time of receiving the slab group 71, the slab groups 71 </ b> A and 71 </ b> B of FIG. It is rearranged to 71D and 71E.
In step S <b> 109, the administrator issues an instruction to the device corresponding to his / her base so that the sorting is performed together with the payout. By this instruction, the crane at its own site performs sorting together with the payout. In the example of FIG. 5, the slab groups 71C, 71D, 71E in FIG. 5B are rearranged into the slab groups 71F, 71G in FIG.

In step S110, the manager issues an instruction to the device corresponding to the own base so as to perform the payout. In response to this instruction, the crane at its own site performs the payout. At this time, no replacement is performed.
When the slab group 71 is paid out from the steelmaking factory 10, the slab group 71 is loaded on the first transport facility 40A. When the slab group 71 is paid out from the intermediate yard 50, the slab group 71 is loaded on the first transfer facility 40A or the second transfer facility 40B.

Next, the overtaking process in the transport facility 40 will be described with reference to FIG. FIG. 8 is a flowchart of the overtaking process in the transport facility 40. The process of FIG. 8 is an example of a transfer / replacement step performed by the transfer / replacement unit of the present invention.
In step S <b> 200, the manager refers to the output of the transport facility management device 104 and confirms that the slab group 71 transported by the transport facility 40 has been determined. Note that when the slab group 71 transported by the transport facility 40 has not been determined, the manager waits until the slab group 71 transported by the transport facility 40 is determined. Hereinafter, the transport facility 40 confirmed by the administrator in step S200 is referred to as a processing target transport facility.
In step S <b> 201, the administrator refers to the output of the transfer facility management apparatus 104 or the like, and for the slab group 71 loaded and transferred on the processing target transfer facility, has the time to reach the transfer destination base determined? Judge whether or not. The administrator advances the process to step S202 when the time is fixed, and advances the process to step S205 when the time is not fixed.

In step S202, the administrator refers to the output of the transfer facility management apparatus 104 or the like to check whether the slab group 71 loaded and transferred on the transfer target transfer facility is in time for the transfer destination site without overtaking. Judge whether or not. The administrator advances the process to step S205 when it is in time for the destination site without overtaking, and advances the process to step S203 when it is not in time.
In step S <b> 203, the manager refers to the output of the transport facility management device 104 and determines whether the processing target transport facility can be overtaken by the transport route 30. The administrator advances the process to step S204 when the overtaking is possible and advances the process to step S205 when the overtaking is not possible.

In step S <b> 204, the manager inputs to the transport facility management apparatus 104 that the processing target transport facility performs overtaking. With this input, the transport facility 40 sets a schedule so that the processing target transport facility performs overtaking. In principle, the overtaking set in step S204 is to perform overtaking using the transport route 30 which is overtaking without heat loss. However, for example, overtaking using the intermediate yard 50 is set in accordance with the traffic congestion situation of the first route 31 and the second route 32.
In step S <b> 205, the administrator inputs to the transfer facility management apparatus 104 that transfer is to be started. With this input, the processing target transport facility starts transporting the loaded slab group 71. At this time, if overtaking is set in step S204, the set overtaking is performed.

Next, an example of the temperature of the slab when the slab 70 is conveyed by the slab conveyance method of the present embodiment will be described with reference to FIG. 9 as compared with a comparative example.
In the example of FIG. 9, the slab 70 is conveyed as follows in both the present embodiment and the comparative example. That is, the slab 70 is manufactured at the steelmaking factory 10 and is conveyed to the first yard 21 of the rolling front yard 20 through the first route 31. Next, the slab 70 is conveyed to the second yard 25 of the rolling front yard 20. Next, the slab 70 is conveyed to the heating furnace 61 via the heating furnace charging table 60.
Moreover, in the example of FIG. 9, only the replacement | exchange which forms an order designation | designated slab group is required, and it is assumed that the other replacement is not required. As described above, the replacement that forms the order-designated slab group includes the replacement by width and the replacement that forms the wide order slab group from the slab group 71 that has been replaced by width. Moreover, since the replacement | exchange which forms the wide order slab group from the slab group 71 distributed according to width | variety includes the replacement | exchange which divides the slab 70 into the heating furnace 61, it will be called the replacement | exchange according to heating furnace.

Next, the comparative example of FIG. 9 will be described. In the comparative example of FIG. 9, in principle, all necessary replacements are performed when replacement is possible. Specifically, when paying out from the steelmaking factory 10 to the first transfer facility 40A of the first route 21, the distribution by width is performed. In addition, when the slab group 71 is received in the first yard 21, the heating furnace is replaced by a heating furnace.
On the other hand, in the present embodiment, as can be understood from the receiving process and the paying process in FIG. 6, the slab group 71 is discharged from the first yard 21 by performing the distribution by width when the slab group 71 is received in the first yard 21. Occasional replacement by furnace.

In the first step shown in FIG. 9A, the slab 70 is manufactured at the steelmaking factory 10. The temperature of the slab 70 immediately after manufacture is 900 degrees in both the comparative example and the present embodiment.
In the second step, the slab 70 is transported through the steelmaking factory 10 and is paid out to the first transport facility 40A on the first route 21. In the comparative example, distribution by width is performed at the time of payout. This replacement is sorting. On the other hand, in this embodiment, the distribution by width is not performed at the time of payout. That is, in this embodiment, sorting is not performed. Here, as described above, there is no change in heat loss whether or not sorting is performed. Therefore, the temperature of the slab after the second step is the same temperature in the comparative example and this embodiment. For example, if it takes 60 minutes for the conveyance in the steelmaking factory 10 and the temperature of the slab 70 decreases by 2 degrees per minute, the slab 70 becomes 780 degrees after the end of the second step.

In the 3rd process, it pays out to the 1st conveyance equipment 40A, and covers the 1st conveyance equipment 40A (cover clothes).
Next, with reference to FIG.9 (b), the temperature of the slab 70 after cover clothing in a 3rd process in a comparative example and this embodiment is demonstrated.
Here, a case where there are twelve slabs 70 from the first slab 70 to the twelfth slab 70 is considered. Of the twelve slabs 70, the odd-numbered slabs 70 are wide and the even-numbered slabs 70 are narrow. However, the odd-numbered slabs 70 and the even-numbered slabs 70 are not significantly different in width, and the odd-numbered slabs 70 and the even-numbered slabs 70 can be overlapped to form the slab group 71. . Moreover, in the steelmaking factory 10, it shall pay out to 40 A of 1st conveyance facilities in order of the number of the slab 70. FIG. Also, it will take 4 minutes to pay out once. In addition, it is assumed that six slabs 70 are placed on each of the wagons 42A and 42B of the first transport facility 40A.

First, in the comparative example, since the distribution by width is performed in the second step, by sorting, the first slab 70 is placed on the wagon 42A, then the second slab 70 is placed on the freight car 42B, The third slab 70 is placed on the freight car 42A. Thus, a slab group 71J composed of odd-numbered slabs 70 is formed on the wagon 42A, and a slab group 71K composed of even-numbered slabs 70 is formed on the freight car 42B.
The time in parentheses of each slab 70 shown in FIG. 9B is the time from when the first slab 70 is placed on the freight car 42 </ b> A until each slab 70 is placed on the freight car 42. In the comparative example, the slab group 71J is completed 40 minutes after the first slab 70 is placed on the freight car 42A. After the slab group 71J is completed, the cover 43 is put on the slab group 71J. If it takes 4 minutes for the cover garment, the cover garment is finished and the wagon 42A is ready 44 minutes after the first slab 70 is placed on the wagon 42A.
Similarly, in the comparative example, the slab group 71K is completed 48 minutes after the first slab 70 is placed on the freight car 42A. After the slab group 71K is completed, the cover 43 is put on the slab group 71K. Therefore, the preparation of the freight car 42B is completed 52 minutes after the first slab 70 is placed on the freight car 42A.
Here, the preparation time of each freight car 42 in the comparative example will be described. The preparation time of the freight car 42 is the time from when the first slab 70 is placed on the freight car 42 until the cover clothing is finished. In the freight car 42A of the comparative example, the cover clothing ends 44 minutes after the first first slab 70 is placed, so the preparation time of the freight car 42A is 44 minutes. In the freight car 42B of the comparative example, the cover clothes are finished 48 minutes after the first second slab 70 is placed, so the preparation time of the freight car 42B is 48 minutes.

For the first slab 70 of the slab group 71J, the cover clothing ends 44 minutes after being placed on the freight car 42A. Similarly, among the odd-numbered slabs 70, the third to eleventh slabs 70 are covered after 36 minutes, 28 minutes, 20 minutes, 12 minutes and 4 minutes after being placed on the wagon 42A. Ends. Therefore, in the slab group 71J, each slab 70 is put on the freight car 42A, and the cover clothes are finished after an average of 24 minutes. Similarly, in the slab group 71 </ b> K, the slab 70 is covered with the cover clothing after an average of 24 minutes after being placed on the freight car 42 </ b> B.
Assuming that the temperature of the slab 70 is lowered by 1 degree per minute from when the slab 70 is placed on the freight car 42 until the cover clothes are finished, in the comparative example, the temperature of the slab 70 is lowered by 24 degrees to 756 degrees.

Next, in this embodiment, since the distribution by width is not performed in the second step, the slab group 71 is formed in the order of the number of the slab 70. That is, first, the first to sixth slabs 70 are placed on the wagon 42A to form a slab group 71L. Next, the cover 43 is put on the slab group 71L. Next, the seventh to twelfth slabs 70 are placed on the freight car 42B to form a slab group 71M. Next, the cover 43 is put on the slab group 71M.
Here, the preparation time of each freight car 42 in this embodiment is demonstrated. In the freight car 42A of the present embodiment, since the cover clothes are finished 24 minutes after the first slab 70 is placed, the preparation time of the freight car 42A is 24 minutes. In the freight car 42B of this embodiment, since the cover clothes are finished 24 minutes after the seventh slab 70 is placed, the preparation time of the freight car 42B is 24 minutes.
Covering of the first slab 70 of the slab group 71L ends 24 minutes after being placed on the freight car 42A. Similarly, after the second to sixth slabs 70 are placed on the freight car 42A, the cover clothing ends after 20 minutes, 16 minutes, 12 minutes, 8 minutes, and 4 minutes, respectively. Therefore, in the slab group 71L, the slab 70 finishes the cover clothing after an average of 14 minutes after being placed on the freight car 42A. Similarly, in the slab group 71M, the cover clothing is finished after an average of 14 minutes after the slab 70 is placed on the freight car 42B.
Assuming that the temperature of the slab 70 drops once per minute from the time when the slab 70 is placed on the freight car 42 until the end of the cover clothing, in the present embodiment, the temperature of the slab 70 is lowered by 14 degrees to 766 degrees.

In the fourth step, the first transport facility 40 </ b> A transports the slab group 71 to the first yard 21 through the first route 31. If this conveyance takes 90 minutes and the temperature of the slab 70 is lowered by 1 degree per minute, the temperature of the slab 70 is lowered by 63 degrees. Therefore, the temperature of the slab in the comparative example is 693 degrees, and the temperature of the slab 70 in the present embodiment is 703 degrees.
In the fifth step, first, the slab group 71 is received in the first yard 21, then the slab group 71 waits for a certain time in the first yard 21, and then the slab group 71 is paid out from the first yard 21. The
Here, in the comparative example, when the slab group 71 is received, the heating furnace is replaced by sorting. It is assumed that the height of the slab group 71 becomes four stages (a state in which four slabs 70 are overlapped) by this replacement by heating furnace. Moreover, when the height of the slab group 71 is four steps, the temperature of the slab 70 is lowered by 0.4 degrees per minute. In the first yard 21, it is assumed that it waits for 300 minutes. At this time, in the comparative example, the temperature of the slab 70 is lowered by 120 degrees to 573 degrees.

  On the other hand, in the present embodiment, when the slab group 71 is received, the distribution by width is performed by sorting, and the distribution by heating furnace is performed by sorting at the time of dispensing. In the distribution by width, it is assumed that the height of the slab group 71 is eight steps (a state in which eight slabs 70 are overlapped). Therefore, in this embodiment, the height of the slab group 71 when the slab group 71 is waiting for a certain time in the first yard 21 is higher than that of the comparative example. Therefore, heat loss is small. Specifically, in this embodiment, the temperature of the slab 70 is decreased by 0.3 degrees per minute. In the first yard 21, it is assumed that it waits for 300 minutes. At this time, in this embodiment, the temperature of the slab 70 is lowered by 90 degrees to 613 degrees. In the present embodiment, when the heating furnace is sorted by sorting at the time of payout, the height of the slab group 71 is assumed to be four tiers as in the comparative example.

  In the sixth step, first, the slab group 71 waits for a certain time in the second yard 25, and then the slab group 71 is conveyed to the heating furnace 61 via the heating furnace charging table 60. The slab group 71 waits for 10 minutes in the second yard 25, and the temperature of the slab 70 decreases by 1 degree per minute. Then, in the comparative example, the temperature of the slab 70 is lowered by 10 degrees to 563 degrees and conveyed to the heating furnace 61. On the other hand, in the present embodiment, the temperature of the slab 70 is lowered by 10 degrees to 603 degrees and conveyed to the heating furnace 61.

  Thus, in this embodiment, it is conveyed to the heating furnace 61 in a state where the temperature of the slab 70 is 40 degrees higher than in the comparative example. That is, in this embodiment, compared with a comparative example, the fall of the temperature of the slab 70 at the time of conveyance can be suppressed. Therefore, in this embodiment, the amount of fuel used in the heating furnace 61 can be reduced, and the amount of carbon dioxide emission can be further reduced.

As described above, in this embodiment, the slab group 71 is replaced based on the next transport destination of the slab 70 at the base. Therefore, as much as possible, replacement will be performed at a later site. Therefore, the unit of the slab group 71 is hardly reduced, and the heat loss of the slab group 71 is reduced. For this reason, the fall of the temperature of the slab 70 at the time of conveyance can be suppressed.
Further, in a base where there are a plurality of transport destinations capable of transporting the slab 70, when the slab group 71 is paid out, the replacement is performed based on the transport destination of the slab 70. Therefore, even when there is a time from when the slab group 71 is received at the base until the slab group 71 is paid out, it is possible to avoid the slab group 71 from being reduced by the replacement, and to reduce heat loss. For this reason, the fall of the temperature of the slab 70 at the time of conveyance can be suppressed.
In addition, at the base, when the slab group 71 is received, the replacement is performed based on whether or not the slab 70 is received at the base. Therefore, before reaching the base, there is no need to perform replacement based on whether or not the slab group 71 is kept at the base where the slab 70 is received. Therefore, the unit of the slab group 71 is hardly reduced, and the heat loss of the slab group 71 is reduced. For this reason, the fall of the temperature of the slab 70 at the time of conveyance can be suppressed.

In addition, replacement is performed at the base based on the temperature of the slab 70. Therefore, it is possible to avoid the slabs 70 having different temperatures from being grouped into one slab group 71, and to suppress a decrease in the temperature of the slabs 70.
Further, at the base, when the decrease in the temperature of the slab 70 due to the replacement based on the temperature of the slab 70 is smaller than the decrease in the temperature when the replacement based on the temperature of the slab 70 is not performed, the distribution based on the temperature of the slab 70 is performed. Do the replacement. Therefore, it is possible to avoid replacement in which the temperature of the slab 70 is lowered, and a decrease in the temperature of the slab 70 can be suppressed.
Further, even when the replacement based on the temperature of the slab 70 is performed at the base, the replacement is performed based on the temperature of the slab 70 when the slab group 71 to be received and the slab group 71 to be paid out do not stay. . Therefore, it is possible to avoid that the replacement based on the temperature of the slab 70 hinders the distribution of the slab 70.

In addition, when the first order replacement condition and the second order replacement condition are satisfied at the base, even if the local base is not the order specification base, the replacement that forms the order specification slab group is performed. Therefore, even if there is a base that cannot be replaced to form an order-designated slab group at a base through which the slab 70 passes, the slab 70 is transported without delay.
Further, at the base, the last one of a plurality of transfers forming the order-designated slab group is performed by sorting performed when the slab group 71 is paid out. Therefore, heat loss due to replacement can be suppressed.
In addition, when the base where the slab 70 is transported next is a non-replaceable base at the base where the replacement can be performed, the replacement is performed as follows. That is, the next transfer of the last non-replaceable base of one or more consecutive non-replaceable bases when the base through which the slab 70 is routed is sequentially followed from the base where the slab 70 is transported next. The replacement is performed based on the previous. Therefore, even if there is a non-replaceable base in the base through which the slab 70 passes, the slab 70 is transported without delay.

In addition, the transfer facility 40 replaces one of the slab groups 71 with the other of the slab groups 71 based on the time to reach the next transfer destination base of the slab group 71 transferred by the transfer facility 40. Do overtaking. Therefore, the order of the slabs 70 can be changed without using the base crane.
Further, the transport facility 40 performs overtaking using the transport route 30. That is, overtaking is performed using the two upstream routes 31A and 31B in the first route 31. Since this overtaking has no heat loss as described above, the order of the slabs 70 can be changed without lowering the temperature of the slabs 70.
The slab group 71 is a state in which the slabs 70 are piled up. Therefore, a decrease in the temperature of the slab 70 can be suppressed.

In the above embodiment, the administrator makes various determinations in FIGS. 6 and 8. However, all or some of the judgments made by the manager may be performed by devices such as the rolling front yard management device 103, the intermediate yard management device 102, and the transport facility management device 104.
The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

  Although the present invention has been described together with the embodiments, the above-described embodiments are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention is interpreted in a limited manner by these. It must not be. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

1 Logistic System, 10 Steel Factory, 20 Rolling Front Yard, 21 1st Yard, 25 2nd Yard, 30 Transfer Route, 31 1st Route, 32 2nd Route, 40 Transfer Equipment, 50 Intermediate Yard, 60 Heating Furnace Table, 61 Heating furnace, 62 Hot rolling mill

Claims (18)

A slab transport method for transporting a slab manufactured at a steelmaking factory that is one of bases to a heating furnace via the other bases,
A slab transport method comprising: a base replacement step of performing replacement by rearranging a slab group composed of one or more slabs based on a next transport destination of the slab at the base.   2. In the base replacement step, at the base where there are a plurality of transport destinations capable of transporting the slab, replacement is performed based on the transport destination of the slab when the slab group is paid out. The slab conveying method described in 1.   3. The slab transport method according to claim 1, wherein in the base replacement step, the replacement is performed based on whether or not the slab is held at its own base when the slab group is received.   The slab transfer method according to any one of claims 1 to 3, wherein in the base replacement step, replacement is further performed based on a temperature of the slab.   In the base replacement step, when the decrease in the temperature of the slab due to the replacement based on the temperature of the slab is smaller than the decrease in temperature when the replacement based on the temperature of the slab is not performed, based on the temperature of the slab. The slab transport method according to claim 4, wherein replacement is performed. The base is provided with a moving facility that performs at least one of receiving the slab group and paying out the slab group, and replacing the slab group,
In the base replacement step, even when the replacement based on the temperature of the slab is performed, when the slab group to be received and the slab group to be paid out do not stay, based on the temperature of the slab, The slab transport method according to claim 4 or 5, wherein replacement is performed by the moving equipment. In the base, there is an order designation base that pays out an order designation slab group in which an order of slabs constituting the slab group is designated,
The slab transfer method according to any one of claims 1 to 6, wherein in the base replacement step, replacement is performed so that the order-designated slab group is further formed at the order-designated base. In the base, there is an order designation base that pays out an order designation slab group in which an order of slabs constituting the slab group is designated,
In the base replacement step, in the base in a state where the replacement can be performed, further up to the nearest order specification base that is the order specification base closest to the base when the slab is followed in order, It does not go through the bases or passes only through the bases in a state where the replacement for forming the order-designated slab group cannot be performed, and the nearest order-designated base cannot perform the replacement to form the order-designated slab group. The slab transfer method according to any one of claims 1 to 6, wherein, in the state, replacement is performed so as to form the order-designated slab group received by the nearest order-designated base.   The slab transfer method according to claim 7 or 8, wherein in the base replacement step, the replacement for forming the order-designated slab group is performed by a plurality of transfers. In the replacement, sorting is a reclassification of the slab group performed when the slab group is received at the base or when the slab group is paid out from the base, and the slab group rearrangement performed in the base There are Yamanaki,
The slab conveyance according to claim 9, wherein in the base replacement step, the last one of the replacement forming the order-designated slab group is performed by the sorting performed when the slab group is paid out. Method.   In the base replacement step, in the base in a state where replacement can be performed, when the base where the slab is transported next is a non-replaceable base in which replacement cannot be performed, the slab is next Based on the next transfer destination of the last non-replaceable base of one or more consecutive non-replaceable bases when the base through which the slab passes is sequentially followed from the base to be transported The slab transport method according to claim 1, wherein replacement is performed.   Based on the time at which the transport facility for transporting the slab from the base to the different base should reach the base of the next transport destination of the slab group transported by the transport facility, the replacement of the slab group is performed. The slab transport method according to claim 1, further comprising a transport transfer step to be performed.   The slab transfer method according to claim 12, wherein in the transfer / replacement step, as the replacement, one of the slab groups performs an overtaking in which the other of the slab groups is overtaken.   The slab transfer method according to claim 13, wherein, in the transfer and transfer step, the overtaking is performed by passing the slab group to be overtaken and the slab group to be overtaken through different routes.   14. The overtaking is performed by placing the overtaken slab group at the base and carrying the overtaken slab group with the transfer equipment in the transfer and transfer step. Slab transport method.   The slab conveyance method according to any one of claims 1 to 15, wherein the slab group is in a state where the slabs are piled up. A slab transport system that transports a slab manufactured at a steelmaking factory that is one of the bases to a heating furnace via the other bases,
The slab transport system according to claim 1, further comprising: a base replacement means for performing replacement by rearranging a slab group composed of one or more slabs based on a next transport destination of the slab. A program for controlling a slab transport system that transports a slab manufactured at a steelmaking factory that is one of the bases to a heating furnace via the other bases,
A program for causing a computer to execute a base replacement step of performing replacement in which the slab group including one or more slabs is rearranged based on the next transport destination of the slab at the base.

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