JP6679955B2 - Physical distribution system, transportation schedule generation method and program - Google Patents

Description

The present invention relates to a physical distribution system, a transportation schedule generation method and a program.

Rolling of a slab manufactured in a steel factory is performed in the following process, for example. First, a slab is manufactured from molten steel in a steel factory. Next, the manufactured slab is transported from the steel factory to the rolling front yard and temporarily stored. Next, the slab stored in the rolling front yard is conveyed to a heating furnace, heated, and then rolled by a hot rolling mill.
As a technique related to the transportation of the slab from the steelmaking factory to the rolling front yard in this process, Patent Document 1 discloses the following transportation equipment. The transport facility of Patent Document 1 includes a payout station, a receiving station, a track, and a carrier truck that travels on the track. The track connects between the dispensing station and the receiving station. Then, the track includes a first traveling lane whose traveling direction is defined in a direction from the payout station to the receiving station, and a second traveling lane whose traveling direction is defined in a direction from the receiving station to the dispensing station. Further, the transport facility of Patent Document 1 includes a connecting lane that connects the ends of the first and second traveling lanes, and an evacuation lane that is selectively attached to the connecting lane.

JP 61-89161 A

  However, as described in Patent Document 1, in a facility that conveys an article from a payout station to a receiving station (arrival point) using a carriage that travels on a track, congestion of the carriage on the track may occur. There is. For example, when the amount of a conveyed product carried out from the payout station is larger than the amount of a conveyed product that can be carried into the receiving station, there is a possibility that congestion of the carriage may occur. When the transport carriage is congested on the track, the transported goods that need to be preferentially transported to the arrival site cannot be transported within the scheduled time, which may hinder the rolling process.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to maintain the supply balance of conveyed items and to preferentially convey conveyed items having high priority to the arrival point.

The transport schedule generation method of the present invention comprises a departure point of a conveyed item, an arrival point of the conveyed item, a first route that is a route connecting the departure point and the arrival point, and a route that can reach the arrival point. Of the state of the first route and the state of the arrival point, a conveyance route including a certain second route, an intermediate point that can temporarily store the conveyed goods from the departure point to the arrival point, A transport schedule generation method in a physical distribution system comprising at least one predicting means for predicting, wherein a detection step of detecting a disruption in the supply balance of the conveyed goods based on the prediction of the predicting means, and at the arrival point Priorities are set for the conveyed items depending on whether they are included in the processing schedule of 1. Then, based on the priority of the transported object, a scheduling step of establishing a transportation schedule that eliminates the disruption of the supply balance of the transported object by using the intermediate base and the transportation route. .
The distribution system of the present invention is a departure point of a conveyed article, an arrival point of a conveyed article, a first route that is a route connecting the departure point and the arrival point, and a route that can reach the arrival point. At least one of a transport route including two routes, an intermediate site capable of temporarily storing a transported article being transported from the departure site to the arrival site, a state of the first route and a state of the arrival site. Prediction means for predicting either one, detection means for detecting a disruption in the supply balance of the conveyed goods based on the prediction of the predicting means, and conveyed goods depending on whether or not they are incorporated in the processing schedule at the arrival base. Priority is defined in, when the detection means detects the disruption of the supply balance of the conveyed goods, based on the priority of the conveyed goods, using the intermediate base and the conveyance route, And scheduling means to make a transfer schedule to eliminate collapse of the supply balance of Okubutsu, characterized in that it comprises a.
The program of the present invention is a departure point of a conveyed item, an arrival point of an conveyed item, a first route that is a route connecting the departure point and the arrival point, and a second route that can reach the arrival point. A program for generating a transportation schedule in a physical distribution system comprising: a transportation route including a route; and an intermediate point capable of temporarily storing a conveyed object from the departure point to the arrival point, A predicting step of predicting at least one of the state of the first route and a state of the arrival point, a detecting step of detecting an imbalance in the supply balance of the conveyed objects based on the prediction of the predicting step, and the arrival point The priority is set for the conveyed items depending on whether they are included in the processing schedule in the above. When the collapse of the transport is detected, based on the priority of the transport, the intermediate step, and using the transport route, a schedule step for establishing a transport schedule for eliminating the disruption of the supply balance of the transport, Let it run.

  ADVANTAGE OF THE INVENTION According to this invention, the supply balance of a conveyed product can be maintained, and a conveyed product with a high priority can be preferentially carried in to an arrival point.

It is a conceptual diagram of a distribution route. It is a figure which shows the classification of a slab. It is a block diagram of the computer system with which a physical distribution system is provided. It is a figure which shows the graph of various predicted values and actual values in a distribution system, (a) is a figure which shows the number graph of a direct delivery freight car, (b) is a figure which shows the rolling front yard string material stock graph, (c) is a direct delivery FIG. 6 is a diagram illustrating excessive supply and insufficient supply of slabs in the graph of the number of wagons, and (d) is a diagram illustrating insufficient supply of slabs in the rolling front yard string material inventory graph. It is a conceptual diagram of transshipment of slabs. It is a conceptual diagram of carrying out from the middle yard of a slab. It is a conceptual diagram of unloading an emergency slab to an intermediate yard. 7 is a flowchart of a process for detecting and eliminating a supply balance breakdown. It is a flowchart of the process which outputs the graph of the number of direct delivery wagons, and the rolling front yard string material stock graph. It is a flow chart of processing which sets up a usual schedule. It is a flowchart of the process which sets up the schedule which eliminates excess supply. It is a conceptual diagram explaining the process which changes a short track time slab into a long track time slab. It is a flowchart of the process which sets up the schedule which eliminates a supply shortage. It is a figure which shows the graph explaining the schedule which eliminates a supply shortage, (a) is a figure which shows the rolling front yard string material stock graph at the time of supply shortage, (b) is before setting the schedule which eliminates a supply shortage. The figure which shows the graph of the number of direct delivery freight cars, and (c) is a figure which shows the graph of the number of direct delivery freight cars after making the schedule which eliminates a supply shortage. It is a figure explaining slab transportation time, (a) is a figure showing a graph of slab transportation time in a physical distribution system of this embodiment, and (b) shows a graph of slab transportation time in a physical distribution system which is a comparative example. It is a figure. It is a figure explaining truck time, (a) is a figure showing the graph of truck time in the physical distribution system of this embodiment, and (b) is a figure showing the graph of truck time in the physical distribution system which is a comparative example. .

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
First, the distribution route of the present embodiment will be described with reference to FIG. FIG. 1 is a conceptual diagram of a distribution route of this embodiment.
The physical distribution route of this embodiment includes a physical distribution system 1, a heating furnace 2, and a hot rolling mill 3.

The physical distribution system 1 is a system that conveys the slab manufactured in the steelmaking factory 10 to the rolling front yard 11. The distribution system 1 includes a steelmaking factory 10, a rolling front yard 11, an intermediate yard 12, a transportation route 20, and a train 30.
The steelmaking factory 10 includes a converter and a continuous casting machine. The converter produces molten steel, and the continuous casting machine cools the molten steel produced in the converter into a plate-like shape and cuts it into a predetermined length to produce a slab.
Further, the steel factory 10 has a place for temporarily storing the manufactured slab, and is equipped with a plurality of cranes. The crane of the steelmaking factory 10 is used for mounting the slab of the steelmaking factory 10 on the wagon 32 of the train 30. The slab is an example of the conveyed product of the present invention, and the steelmaking factory 10 is an example of the starting point of the present invention.
The rolling front yard 11 is a place for temporarily storing the slab carried into the heating furnace 2, and includes a plurality of cranes. The crane of the rolling front yard 11 lowers the slab loaded on the freight car 32 that has arrived at the rolling front yard 11 to the rolling front yard 11 or carries out the slab stored in the rolling front yard 11 to the heating furnace 2. Or The rolling front yard 11 is an example of the arrival base of the present invention.

  The intermediate yard 12 is a place where a part of the slab being transported from the steelmaking factory 10 to the rolling front yard 11 can be temporarily stored, and is located between the steelmaking factory 10 and the rolling front yard 11. The intermediate yard 12 is equipped with a crane. The crane in the intermediate yard 12 lowers the slabs loaded and transported in the freight cars 32 by the direct transfer route 21 from the freight cars 32 to the intermediate yard 12, or moves the slabs in the intermediate yard 12 to the freight cars 32 on the direct transfer route 21 or the bypass route 22. You can load it in. Further, the crane in the intermediate yard 12 can directly transfer the slab loaded on the freight car 32 on the direct transfer route 21 to the freight car 32 on the bypass route 22. Note that the slab that is lowered onto the intermediate yard 12 will be described in detail later. The intermediate yard 12 is an example of the intermediate base of the present invention.

The transport route 20 includes a direct route 21 and a bypass route 22. The direct delivery route 21 is a route that connects the steelmaking plant 10 and the rolling front yard 11 and passes through the intermediate yard 12. The train 30 travels on the direct delivery route 21, and the slab of the steelmaking factory 10 is conveyed to the rolling front yard 11. The bypass route 22 is a route that connects the intermediate yard 12 and the rolling front yard 11. The train 30 travels on the bypass route 22, and the slab in the intermediate yard 12 is transported to the rolling front yard 11.
The direct route 21 and the bypass route 22 each have a first lane and a second lane, but each is a single lane and cannot be overtaken by each lane alone. The first lane is the lane used when the train 30 travels in the direction toward the rolling front yard 11. The second lane is a lane used when the train 30 travels in a direction returning from the rolling front yard 11. For example, the train 30 that has transported the slab to the rolling front yard 11 using the first lane of the direct transfer route 21 returns to the steelmaking plant 10 using the second lane. Further, the train 30 that has carried the slab to the intermediate yard 12 using the first lane of the direct transfer route 21 returns to the steelmaking plant 10 using the second lane. The direct route 21 is an example of the first route of the present invention, and the bypass route 22 is an example of the second route of the present invention.

  The train 30 includes a towing vehicle 31 and a freight car 32 and travels along the transportation route 20 to transport the slab. The towing vehicle 31 is, for example, a diesel locomotive, and tows a freight car 32 connected to the towing vehicle 31. The freight car 32 is a vehicle on which a slab can be placed. In the example shown in FIG. 1, the train 30 includes one towing vehicle 31 and four freight cars 32, but the number of trains other than this may be sufficient. A plurality of trains 30 operate on the transport route 20. Further, the transportation facility used for transporting the slab is not limited to the freight car 32, and may be a conveyor, a vehicle (for example, an electric car, a train or a trailer), or the like.

The heating furnace 2 heats the slab carried in from the rolling front yard 11 to a temperature suitable for rolling.
The hot rolling mill 3 rolls the slab carried in from the heating furnace 2. The hot rolling mill 3 includes a plurality of rolling roll sets each including a pair of rolling rolls. Then, the slab is rolled by rotating the rolling roll and passing the slab between the pair of rolling rolls in each rolling roll set.
The rolling roll is replaced with a new rolling roll after rolling a predetermined amount of slab. This is because the rolling roll may be deformed as the number of times of rolling increases and the quality of rolling may not be ensured. The sequence of slabs that are rolled after the rolls are replaced and before the rolls are replaced next is called a rolling schedule, and the amount of the slabs is called a rolling unit.

Next, with reference to FIG. 2, classification of slabs transported in the physical distribution system 1 will be described.
FIG. 2 is a diagram showing classification of slabs.
The slab has any one of the first to fourth priorities classified from the viewpoint of the tied material / excess material, whether or not the rolling schedule has been incorporated, and the length of the track time.
First, slabs are classified into either tied material slabs or surplus material slabs. The tied material slab is a slab tied to a steel material order. The surplus material slab is a slab that is not tied to steel orders. In the present embodiment, only the corded material slab is heated in the heating furnace 2 and rolled by the hot rolling mill 3.

The corded material slab is further classified into either a slab within the rolling schedule or a slab outside the rolling schedule. The rolling schedule is a schedule of rolling performed by the hot rolling mill 3. The slab in the rolling schedule represents that it is incorporated in the schedule of the rolling performed by the hot rolling mill 3, and the slab outside the rolling schedule has not been incorporated in the schedule of the rolling performed in the hot rolling mill 3. Represents The rolling schedule is determined, for example, half a day before the time when rolling is performed.
Slabs within the rolling schedule are further classified as either short track time slabs or long track time slabs. The track time is the total time of the slab transportation time and the residence time in the rolling front yard 11. The slab transportation time is the time from when the slab is manufactured in the steelmaking factory 10 until it reaches the rolling front yard 11 including the storage and transshipment time in the intermediate yard 12. The residence time in the rolling front yard 11 is the time from when the slab reaches the rolling front yard 11 until it is loaded into the heating furnace 2. Then, for example, a slab whose track time is 10 hours or less is called a short track time slab, and a slab whose track time is longer than 10 hours is called a long track time slab.
Further, the surplus material slab and the slab outside the rolling schedule are referred to as non-urgent slab.

The short-track time slab is transported from the steelmaking factory 10 to the rolling front yard 11 by a direct route 21. In principle, the long truck time slab is also transported from the steelmaking factory 10 to the rolling front yard 11 by the direct route 21. However, as will be described later, when excess supply is predicted, the long truck time slab is transferred from the freight car 32 on the direct transfer route 21 to the freight car 32 on the bypass route 22 at the intermediate yard 12, and the rolling front yard 11 Be transported to. The non-urgent slab is transported to the intermediate yard 12 via the direct route 21 and then stored in the intermediate yard 12. Then, at an appropriate opportunity, the sheet is conveyed to the rolling front yard 11 by the bypass route 22 in principle.
As shown in FIG. 2, the short track time slab has the first priority, the long track time slab has the second priority, the slabs outside the rolling schedule have the third priority, and the surplus material has the fourth priority. Called a slab.
Which of the first to fourth priorities the slab has is determined when the slab is manufactured in the steel factory 10. Even if the surplus material slab is initially stored, the priority may be changed by, for example, being tied to the order when the surplus material slab is stored in the intermediate yard 12 to become the tied material slab. For example, when a slab is ordered, a person in charge or a system such as the steelmaking schedule management device 51 determines whether the surplus material slab and the order can be linked. Then, when tied, the surplus material slab is tied to an order by a system such as the steelmaking schedule management device 51 to form a tied material slab.

Next, a computer system included in the physical distribution system 1 will be described with reference to FIG. FIG. 3 is a block diagram of a computer system included in the physical distribution system 1.
The physical distribution system 1 includes a simulation device 50, a steelmaking schedule management device 51, a heating and rolling schedule management device 52, an intermediate yard management device 53, a rolling front yard management device 54, and a freight car management device 55.

The simulation device 50 creates and outputs a direct delivery freight car number graph and a rolling front yard string material stock graph described below. As described later, an operator of the physical distribution system 1 (hereinafter, referred to as an operator) refers to these graphs to detect the disruption of the slab supply balance.
Here, a graph of the number of direct-delivery freight cars will be described with reference to FIG. The direct delivery freight car number graph is a graph showing the number of direct delivery freight cars per hour. The number of direct delivery freight cars is the number of freight cars 32 on which the slabs are loaded and on the direct delivery route 21. In the graph of the number of direct delivery freight cars, the horizontal axis represents time and the vertical axis represents the number of direct delivery freight cars. The direct delivery freight car number graph includes actual values and predicted values of the direct delivery freight car numbers. The number of direct delivery wagons before the current time is the actual value, and the number of direct delivery wagons after the current time is the predicted value.

Next, with reference to FIG. 4B, a rolling front yard string material stock graph will be described. The rolled front yard tied material inventory graph is a graph showing the rolled front yard tied material inventory for each hour. The rolling front yard string material stock is the inventory amount of the string material slabs stored in the rolling front yard 11. In the rolled front yard string material inventory graph, the horizontal axis represents time, and the vertical axis represents the rolled front yard string material inventory. The rolled front yard stringed material inventory graph includes actual values and predicted values of the rolled front yard stringed material inventory. The rolling front yard string material stock before the current time is the actual value, and the rolling front yard string material stock after the current time is the predicted value.
The simulation apparatus 50 acquires various data from each of the management apparatuses 51 to 55, performs various calculations, and generates and outputs these graphs, as will be described in detail later.

The simulation device 50 can also perform various simulations in addition to the above processing. For example, the simulation device 50 can simulate the movement of the physical distribution system 1 when the long time track slab placed on the freight car 32 on the direct route 21 is transferred to the freight car 32 on the bypass route 22 and conveyed to the rolling front yard 11. . Further, the simulation device 50 can simulate the movement of the physical distribution system 1 when the slabs stored in the intermediate yard 12 are loaded on the freight cars 32 on the bypass route 22 and transported to the rolling front yard 11.
Further, the simulation device 50 can acquire the schedule managed by the steelmaking schedule management device 51 or the like and information on the slab on the distribution system 1 from the steelmaking schedule management device 51 or the like and output it. The simulation device 50 is an example of the prediction means of the present invention.

The steelmaking schedule management device 51 manages the schedule of the slabs manufactured in the steelmaking factory 10 and the slabs temporarily stored in the steelmaking factory 10. Further, the steelmaking schedule management device 51 manages the transportation schedule of the slabs carried out from the steelmaking factory 10.
The heating / rolling schedule management device 52 manages the heating schedule of the slab in the heating furnace 2, the rolling schedule of the slab in the hot rolling mill 3, and the like.
The intermediate yard management device 53 manages the amount of slabs stored in the intermediate yard 12, the slab storage schedule, and the like.
The rolling front yard management device 54 manages the amount of slabs stored in the rolling front yard 11, the slab storage schedule, and the like.
The freight car management device 55 manages the operation of the train 30 on the transportation route 20.

  The simulation device 50 includes a CPU (Central Processing Unit), a memory, and a storage device such as a hard disk. Similarly, the steelmaking schedule management device 51, the heating and rolling schedule management device 52, the intermediate yard management device 53, the rolling front yard management device 54, and the freight car management device 55 each include a storage device such as a CPU, a memory, and a hard disk. The programs stored in the storage device are expanded in the memory, and the CPU executes the programs expanded in the memory, whereby the functions of the respective devices are realized. It should be noted that data acquired from other devices or the like is used as necessary to realize the functions of the respective devices.

Next, with reference to FIGS. 4 (c) and 4 (d), a method for detecting an imbalance in the supply balance of the slab in the physical distribution system 1 will be described.
First, with reference to FIG. 4C, a method for detecting a state of excessive supply of slabs in the physical distribution system 1 will be described. Excessive supply of slabs in the distribution system 1 is determined by the number of freight cars 32 on which the slabs are loaded and on the direct delivery route 21, that is, the number of direct delivery freight cars described above. When the number of direct delivery freight cars is equal to or greater than a predetermined threshold value, the distribution system 1 is determined to be in a state of excessive supply of slabs.
The excessive supply of slabs is determined in this way when the number of direct-delivery wagons is equal to or greater than the threshold value, the slabs cannot be accommodated in the rolling front yard 11, and the freight cars 32 may accumulate on the direct-delivery route 21 to cause congestion. Because there is. The reasons why the slabs cannot be accommodated in the rolling front yard 11 include, for example, lack of storage space for the slabs in the rolling front yard 11 and the work of lowering the slab from the freight car 32 by the crane in the rolling front yard 11 cannot be caught up. , Sometimes.
In the example shown in FIG. 4C, the number of direct-delivery freight cars is equal to or greater than the threshold value in the first time zone. Therefore, it is determined that the distribution system 1 is in an excessive supply state of slabs in the first time zone. The threshold value for the number of direct-delivery freight cars used for determining whether or not there is an excessive supply is an example of the first threshold value of the present invention.

Next, with reference to FIG. 4C and FIG. 4D, a method of detecting a state of insufficient supply of slabs in the distribution system 1 will be described. The supply shortage of slabs in the physical distribution system 1 is determined by the number of direct-delivery freight cars and the inventory amount of the tied material slabs stored in the rolling front yard 11, that is, the rolling front yard tied material inventory. When the number of direct delivery freight cars is less than a predetermined threshold value and the rolling front yard string material stock is less than a predetermined threshold value, the distribution system 1 is determined to be in a state of insufficient supply of slabs.
Explain why the slab supply shortage is judged in this way. As described above, the slabs that can be rolled by the hot rolling mill 3 are the tied material slabs (the slabs having the first to third priority levels), so when the rolling front yard tied material inventory is less than the threshold value, there are no slabs that can be rolled. there is a possibility. Therefore, it is necessary to supply a certain amount of slab to the rolling front yard 11. However, when the number of freight cars is less than the threshold value, it is possible to predict that there is a high possibility that a sufficient amount of slab cannot be supplied to the rolling front yard 11 and there will be no slab that can be rolled (stock shortage prediction). Therefore, when the number of direct delivery freight cars is less than the predetermined threshold value and the rolling front yard string material stock is less than the predetermined threshold value, the distribution system 1 is determined to be in a state of insufficient supply of slabs.
In the example illustrated in FIGS. 4C and 4D, the number of direct-delivery freight cars is less than the threshold value and the rolling front yard string material inventory is less than the threshold value in the second time zone. Therefore, it is determined that the physical distribution system 1 is in a state of insufficient supply of slabs during the second time period. The threshold value of the number of direct delivery freight cars used for determining whether the supply is insufficient is an example of the second threshold value of the present invention. In the present embodiment, the first threshold and the second threshold have the same value, but different values may be used. The threshold value of the rolled front yard string material stock used for determining whether or not the supply is insufficient is an example of the third threshold value of the present invention.

Next, with reference to FIG. 5A to FIG. 5C, an outline of schedule generation of slab transportation, which is performed when an imbalance in the supply balance of slabs in the physical distribution system 1 is detected, will be described.
First, with reference to FIG. 5A, description will be given of generation of a slab transportation schedule when it is predicted that the slab will be excessively supplied in the distribution system 1. It is necessary to reduce the number of direct-delivery wagons during times when slabs are oversupplied to prevent traffic congestion during times when slabs are oversupplied. On the other hand, the short track time slab (first priority slab) needs to be preferentially transported to the rolling front yard 11.
Therefore, a schedule is set to transport the long track time slab (second priority slab) on the transport route 20 to the rolling front yard 11 by a route different from the route on which the short track time slab is transported. Specifically, as shown in FIG. 5A, the long truck time slab 35A loaded on the freight car 32 on the direct delivery route 21 is transferred to the freight car 32 on the bypass route 22 and conveyed to the rolling front yard 11 on the bypass route 22. Make a schedule to do. The transshipment of the long truck time slab 35A is performed by the crane in the intermediate yard 12.
As a result, the number of direct-delivery freight cars is reduced, the occurrence of congestion on the direct-delivery route 21 is suppressed, and the short-track time slab is preferentially transported to the rolling front yard 11 by the direct-delivery route 21.
In addition, the non-emergency slabs (third and fourth priority slabs) are, in principle, lowered and stored in the intermediate yard 12, as described later. Further, the freight car 32 from which the long truck time slab 35A has been unloaded on the direct delivery route 21 is disconnected from the train 30 as necessary, and is transported to, for example, the steel factory 10 by the second lane of the direct delivery route 21.

The slab stored in the intermediate yard 12 has a transport priority indicating the transport order from the intermediate yard 12. This transportation priority is determined based on, for example, the delivery date of the order tied to the slab. At this time, the farther the delivery date is (the future is), the lower the transport priority is.
In addition, the latest rolling date calculated backward from the delivery date is set for the order. The latest rolling day is the latest rolling mill opportunity to reach the rolling front yard 11 in order to meet the rolling roll opportunity and delivery date. Therefore, the transportation priority may be determined based on the latest rolling day. At this time, the farther the rolling latest date is (the future is), the lower the transport priority is.
Here, the opportunity of the rolling roll will be described. Depending on the type of slab, the rolling rolls that can be used during rolling may be fixed. For example, a hard slab needs to be rolled with a rolling roll that can roll the hard slab. On the other hand, the type and schedule of the rolling rolls used in the hot rolling mill 3 are managed by the heating and rolling schedule management device 52. Therefore, the opportunity of the rolling roll that can roll the slab is determined for each slab from the type and schedule of the rolling roll used in the hot rolling mill 3.
When the slab is tied to the order, the delivery priority and the latest rolling date are long, so the transportation priority is low. However, as the date passes, the delivery date and the latest rolling date become closer, so that the transport priority becomes higher.
The transportation priority may be determined from the viewpoint of how to place the slabs stored in the intermediate yard 12, in addition to the delivery date and the latest rolling day. For example, slabs collectively stored in the intermediate yard 12 may be easily taken out from the intermediate yard 12, and thus may be given a high transportation priority.

Next, with reference to FIG. 5B, generation of a slab transportation schedule when the distribution system 1 predicts that the supply of slabs will be insufficient will be described. When the supply of slabs is predicted to be insufficient, the tying material slabs (slabs having the first to third priorities) are conveyed to the rolling front yard 11 before the time when the supply of slabs is predicted to be insufficient, and It is necessary to prevent material shortages during times when supply is expected to be insufficient.
Therefore, as shown in FIG. 5B, the stringed material slab 35B stored in the intermediate yard 12 is transported to the rolling front yard 11 to establish a schedule for preventing material shortage. At this time, a slab having a high transport priority is preferentially transported. In this case, the bypass route 22 is used in principle for transporting the stringing material slab 35B. The loading of the stringing material slab 35B stored in the intermediate yard 12 onto the freight car 32 on the bypass route 22 is performed by the crane in the intermediate yard 12.
As a result, the tied material slab 35B is conveyed to the rolling front yard 11, and material shortage is prevented.

  Next, with reference to FIG. 5C, handling of the emergency slabs (third and fourth priority slabs) will be described. As mentioned above, the non-urgent slab is a slab out of the rolling schedule or a surplus material slab and will not be rolled in the near future. Therefore, as a general rule, the non-urgent slab 35C carried out from the steel factory 10 via the direct delivery route 21 is set down on the intermediate yard 12 regardless of whether the slab is excessively supplied or insufficiently supplied. As a result, it is possible to suppress the occurrence of congestion on the direct delivery route 21 and preferentially convey the slab having a high priority to the rolling front yard 11. In addition, the freight car 32 in which the emergency slab has been unloaded on the direct delivery route 21 is disconnected from the train 30 as necessary, and is transported to the steel factory 10, for example, by the second lane of the direct delivery route 21.

  Next, of the slabs stored in the intermediate yard 12, the handling of slabs having a high transport priority will be described. Here, a case will be described where a slab having a high transport priority is determined based on the latest rolling date. A slab having a high priority of transportation has a latest rolling date close to it, and for example, becomes the latest rolling date within a predetermined date. Such a slab needs to be transported to the rolling front yard 11 in preparation for rolling. For this reason, among the slabs stored in the intermediate yard 12, the slab having a high transportation priority is basically scheduled to be transported to the rolling front yard 11 by the bypass route 22 as in FIG. 5B.

Next, with reference to FIG. 6, the flow of the control method of the physical distribution system 1 described above, that is, the detection of the imbalance in the supply balance of the slab in the physical distribution system 1 and the generation of the slab transportation schedule. Will be explained.
In step S100, the simulation device 50 starts a process of outputting a graph of the number of direct delivery wagons and a rolling front yard string material inventory graph. The details of the process of outputting the direct delivery freight car number graph and the rolling front yard string material stock graph will be described later.
In step S101, the operator processes the normal schedule. The processing of the normal schedule is to set up a schedule for lowering the non-urgent slab to the intermediate yard 12, or to set up a schedule for transporting the slab in the intermediate yard 12 having a near rolling date to the rolling front yard. Details of the normal schedule process will be described later.

In step S102, the operator refers to the graph of the number of direct-delivery freight cars to confirm whether or not an excessive supply of slabs can be detected. This detection method is as described with reference to FIG. When the operator detects the excessive supply of the slab, the process proceeds to step S103, and when the excessive supply of the slab is not detected, the process proceeds to step S104.
In step S103, the operator establishes a schedule for eliminating excessive supply of slabs. Details of this processing will be described later.

In step S104, the operator refers to the direct delivery freight car number graph and the rolling front yard string material stock graph to confirm whether or not a slab supply shortage can be detected. This detection method is as described with reference to FIGS. 4 (c) and 4 (d). When the operator detects the supply shortage of the slab, the process proceeds to step S105, and when the supply shortage of the slab is not detected, the process returns to step S101. Note that steps S102 and S104 are an example of the detection step of the present invention.
In step S105, the operator sets up a schedule for eliminating the slab supply shortage. Details of this processing will be described later. When the process of step S105 ends, the operator returns the process to step S101. Note that steps 103 and S105 are an example of the schedule step of the present invention.

Next, with reference to FIG. 7, a process of outputting a direct delivery freight car number graph and a rolling front yard string material stock graph will be described.
In step S200, the simulation device 50 receives the actual value of the number of direct delivery freight cars from the freight car management device 55.
Here, a method for the freight car management device 55 to acquire the actual value of the number of directly-delivered freight cars will be described. An IC chip is attached to the freight car 32. Further, an IC chip reader is provided at a predetermined location on the direct delivery route 21. For example, an IC chip reader is provided at a place where a slab is loaded on a freight car 32 on the direct delivery route 21 or an slab is unloaded from the freight car 32 on the direct delivery route 21. Then, the freight car management device 55 receives the information from the reader of the IC chip and acquires the number of direct-delivery freight cars.
Instead of the IC chip, RFID (Radio Frequency Identifier) technology may be used. In this case, an RF tag is attached to the freight car 32 instead of the IC chip, and an RF tag reader is used instead of the IC chip reader. Further, the freight car management device 55 may acquire the actual value of the number of direct delivery freight cars by using GPS (Global Positioning System).

In step S201, the simulation device 50 acquires the data of the slab that is to be carried into the direct delivery route 21. The simulation device 50 receives, from the steelmaking schedule management device 51, data of the slabs that are to be loaded into the direct delivery route 21 from the steelmaking factory 10. In addition, the simulation device 50 receives, from the intermediate yard management device 53, data on the slabs that are to be loaded into the direct delivery route 21 from the intermediate yard 12.
In step S202, the simulation device 50 acquires the data of the slab to be carried out from the direct delivery route 21. The simulation device 50 receives, from the rolling front yard management device 54, data of the slabs to be carried out to the rolling front yard 11 from the direct route 21. Then, the simulation device 50 receives, from the intermediate yard management device 53, the data of the slab to be carried out to the intermediate yard 12 from the direct delivery route 21.

  In step S203, the simulation device 50 calculates the predicted value of the number of direct-delivery freight cars from the data received in steps S201 and S202. The simulation apparatus 50 acquires the data of the slab scheduled to be carried into the direct delivery route 21 in step S201, and acquires the data of the slab scheduled to be delivered from the direct delivery route 21 in step S202. In addition, the number of slabs that can be loaded in one freight car 32 (the number of slabs) is determined by equipment constraints and the like, so the amount of slabs that can be loaded is predetermined. Therefore, by using a physical distribution model based on these data, it is possible to calculate the predicted value of the number of direct-delivery freight cars.

Further, the predicted value of the number of direct-delivery freight cars may be obtained by four arithmetic operations instead of the physical distribution model. In the case of obtaining by the four arithmetic operations, it is calculated by the following formula 1, for example.
(Predicted value of the number of directly-delivered freight cars at time t) = (the number of starting freight cars) + (the planned number of supplied freight cars up to time t) − (the number of planned accepted freight cars up to time t) (Equation 1)
Here, the number of starting point freight cars is the number of direct delivery freight cars at the reference time. When the current time is used as the reference time, the actual value of the number of direct delivery freight cars at the current time is used as the number of starting freight cars.
The planned number of freight cars to be supplied by time t is the number of freight cars 32 loaded with the slabs supplied to the direct delivery route 21 from the reference time to the time t, and is the number of freight cars to be loaded into the direct delivery route 21. It is a value converted into the number of freight cars 32 using data such as the number of sheets or weight.
The planned number of freight cars received up to time t is the number of freight cars 32 on the direct delivery route 21 from which the slab is unloaded between the reference time and time t, and the number or weight of slabs scheduled to be delivered from the direct delivery route 21. It is a value converted into the number of freight cars 32 using data such as.

For conversion into the number of freight cars 32, one of the following expressions 2 to 4 is used.
(Number of freight cars 32) = (Number of slabs) ÷ (Number of slabs loaded on one freight car 32) (Equation 2)
(Number of freight cars 32) = (Total weight of slabs) / (Weight per slab) / (Number of slabs loaded in one freight car 32) (Equation 3)
(Number of freight cars 32) = (Total weight of slabs) ÷ (Total weight of slabs loaded on one freight car 32) (Equation 4)

  In addition, in step S200, the simulation device 50 may calculate the actual value of the number of direct-delivery freight cars as follows. First, the simulation device 50 receives the data of the slab carried into the direct delivery route 21 from the steelmaking schedule management device 51 and the intermediate yard management device 53. Next, the simulation device 50 acquires the data of the slab carried out from the direct delivery route 21 from the rolling front yard management device 54 and the intermediate yard management device 53. Next, by using these acquired data, the actual value of the number of direct delivery freight cars may be calculated by the physical distribution model or the four arithmetic operations, as in the process of step S203.

In step S <b> 204, the simulation device 50 receives and acquires the actual data of the rolling front yard string material stock from the rolling front yard management device 54.
In step S205, the simulation device 50 acquires the data of the tying material slab to be carried into the rolling front yard 11. The simulation device 50 receives, from the steelmaking schedule management device 51, data on the tied material slab that is to be loaded into the rolling front yard 11 from the steelmaking factory 10. In addition, the simulation device 50 receives, from the intermediate yard management device 53, data of the tied material slab that is to be carried into the rolling front yard 11 from the intermediate yard 12.
In step S206, the simulation device 50 receives and acquires the data of the tied material slab to be carried out from the rolling front yard 11 from the rolling front yard management device 54.

  In step S207, the simulation device 50 calculates a predicted value of the rolling front yard string material stock from the data received in steps S205 and S206. The simulation apparatus 50 acquires the data of the stringing material slab to be loaded into the rolling front yard 11 in step S205, and acquires the data of the stringing material slab to be loaded from the rolling front yard 11 in step S206. Therefore, based on these data, it is possible to calculate the predicted value of the rolling front yard string material stock.

  In step S208, the simulation device 50 creates a graph of the number of direct delivery freight cars from the actual value and the predicted value of the number of the direct delivery freight cars, and creates a rolling front yard stringing material inventory graph from the actual value and the forecast value of the rolling front yard stringing material inventory. . Then, the simulation device 50 outputs the direct delivery freight car number graph and the rolling front yard string material stock graph to an output device such as a display included in the simulation device 50. After that, the simulation device 50 returns the process to step S200, and updates the outputs of the direct delivery freight car number graph and the rolling front yard string material stock graph.

Next, with reference to FIG. 8, details of the normal schedule process of step S101 of FIG. 6 will be described.
As described above, the process of the normal schedule is to set a schedule for lowering the slab to the intermediate yard 12 or a schedule for transporting the slab in the intermediate yard 12 whose rolling latest date is near to the rolling front yard. .
First, a process of setting a schedule for lowering the emergency slab to the intermediate yard 12 will be described.
In step S300, the operator refers to the output of the simulation device 50 and determines whether or not the non-urgent slab is scheduled to be transported from the steelmaking plant 10 through the direct delivery route 21. The operator advances the process to step S301 when it is determined that the non-urgent slab is planned to be transported by the direct delivery route 21, and the process when it is determined that the non-provisional slab is not planned to be transported by the direct delivery route 21 in step S305. Proceed to.

In step S301, the operator sets up a schedule for unloading the non-urgent slab on the direct delivery route 21 to the intermediate yard 12 based on the storage capacity of the slab in the intermediate yard 12. Then, the operator creates simulation data corresponding to this schedule and inputs it to the simulation device 50.
Here, a procedure in which the operator sets a schedule in step S301 will be described.
First, the operator refers to the output of the simulation device 50 to confirm the amount of the emergency slab to be transported.
Next, the operator refers to the output of the simulation device 50, and as the storage capacity of the slabs in the intermediate yard 12, the operator selects the slabs that can be stored in the intermediate yard 12 in the time zone when the non-urgent slab is scheduled to be transported. Check the amount.
Next, the operator determines whether or not all the emergency slabs to be transported can be stored in the intermediate yard 12. When the operator determines that all the emergency slabs to be transported can be stored in the intermediate yard 12, the operator sets a schedule to store all the emergency slabs to be transported in the intermediate yard 12.

When the operator determines that all the emergency slabs to be transported cannot be stored in the intermediate yard 12, the operator performs the following work.
First, the priority is given to the emergency slabs to be transported (the emergency slab priority). The steep slab priority is given, for example, from the viewpoint of slab properties and the viewpoint of slab units.
From the viewpoint of the properties of the slab, for example, easiness of rolling and whether the material is a string slab or a surplus material slab are determined. Generally, the harder a slab is, the more difficult it is to roll it, and there are cases where special rolling rolls are required. Therefore, for example, a slab having a tensile strength of 600 MPa or less is easily rolled, and a slab having a tensile strength of more than 600 MPa is hard rolled. Then, the surplus material slab that is easily rolled is a low priority non-urgent slab in terms of the properties of the slab. Further, the easily rolled stringed material slab and the hard rolled surplus material slab are defined as medium priority non-urgent slabs in terms of slab properties. Further, the difficultly rolled stringed material slab is a high priority non-steep slab in terms of the properties of the slab. Although an example of the viewpoint of slab properties has been described here, depending on the situation and concept, the surplus material slab for easy rolling is set as a high priority non-urgent slab in terms of the properties of the slab and the priority is set. The height of may be reversed.

  From the viewpoint of the slab unit, for example, it is determined whether the slab steel type and whether or not the slab is manufactured by the same charge or cast. The slab steel type includes the slab material, width, thickness, and delivery date. Depending on the situation, timing and way of thinking, it is desirable to store slabs of similar steel types together in the intermediate yard 12 in consideration of being transported to the rolling front yard 11 later. Further, depending on the situation, timing, and way of thinking, it is desirable to store the slabs manufactured by the same charge or cast together in the intermediate yard 12 in consideration of the pile up in the intermediate yard 12. Although an example of the slab unit has been described here, it may not be desirable to store all the slabs together in the intermediate yard 12 depending on the situation, timing, and way of thinking. May be changed.

Then, from the viewpoint of the characteristics of the slab and the viewpoint of the unit of the slab, the non-steep slab priority is finally determined. For example, in terms of the properties of the slab, the priority is low, and in terms of the unit of the slab, the steel grades of the slab are similar, or the slab manufactured by the same charge or cast has the non-critical slab priority. A low emergency slab. Since the criteria for judging the characteristics of the slabs and the criteria for judging the unit of the slabs change from time to time, the operator determines the urgent slab priority while changing the criteria according to the frequency and the situation. Note that the operator may set the urgent slab priority from either the viewpoint of the slab property or the viewpoint of the slab unit.
Next, the operator selects an amount of slabs that can be stored in the intermediate yard 12 from the emergency slabs with low priority of the emergency slab, and sets a schedule for storing the selected emergency slabs in the intermediate yard 12.
The operator creates simulation data corresponding to the schedule thus created and inputs it to the simulation device 50.

In step S302, the simulation apparatus 50 performs a simulation of the entire physical distribution system 1 based on the simulation data input by the operator.
In step S303, the operator refers to the result of the simulation and determines whether or not a problem occurs in the entire physical distribution system 1. When it is determined that a problem will occur, the operator returns the process to step S301 and corrects the schedule so that the problem does not occur. If the operator determines that no problem occurs, the process proceeds to step S304.
In step S304, the operator registers the created schedule in the steelmaking schedule management device 51. As a result, the schedule set by the operator is reflected in the physical distribution system 1.

Next, a process of establishing a schedule for transporting the slab in the intermediate yard 12 having the latest rolling date close to the rolling front yard 11 will be described.
In step S305, the operator refers to the output of the intermediate yard management device 53 and determines whether or not the slab having the latest rolling date is planned to be stored in the intermediate yard 12. The slab closest to the latest rolling day means a slab whose processing date in step S305 is within a predetermined day (for example, 3 days) from the latest rolling day of the slab. When the operator determines that the slab near the latest rolling date is scheduled to be stored, the process proceeds to step S306, and when the operator determines that the slab near the latest rolling date is not scheduled to be stored, it is shown in FIG. The process ends.

In step S <b> 306, the operator sets up a schedule for transporting the slabs stored in the intermediate yard 12 and having the latest rolling date to the rolling front yard 11 by using the transport route 20. At this time, in principle, the operator makes a schedule to use the bypass route 22 as the transport route 20. However, if it becomes clear that the physical distribution system 1 is inconvenient in the simulation of step S307 described later, a schedule for transporting at least a part of the slabs via the direct delivery route 21 is set up. Then, the operator creates simulation data corresponding to this schedule and inputs it to the simulation device 50.

In step S307, the simulation device 50 performs a simulation of the entire physical distribution system 1 based on the simulation data input by the operator.
In step S308, the operator refers to the result of the simulation and determines whether or not a problem occurs in the entire physical distribution system 1. If the operator determines that a problem will occur, the operator returns the process to step S306 and corrects the schedule so that the problem does not occur. If the operator determines that no problem occurs, the process proceeds to step S309.
In step S309, the operator registers the created schedule in the intermediate yard management device 53. As a result, the schedule set by the operator is reflected in the physical distribution system 1.

Next, with reference to FIG. 9, the details of the process of the excess supply elimination schedule in step S103 of FIG. 6 will be described.
In step S400, the operator refers to the output of the simulation device 50 to determine whether or not there is a long track time slab (second priority slab) in the time zone in which the slab is predicted to be oversupplied. . Specifically, the operator determines whether or not there is a long-track time slab in the slab transported from the steelmaking factory 10 to the rolling front yard 11 by the direct delivery route 21 in a time period when it is predicted that the supply will be excessive. To do. If the operator determines that there is a long track time slab, the process proceeds to step S401, and if it determines that there is no long track time slab, the process proceeds to step S404.

In step S401, the operator sets a schedule for transshipment of the long truck time slab from the freight car 32 on the direct transfer route 21 to the freight car 32 on the bypass route 22 in the intermediate yard 12. Here, the upper limit of the amount of long track time slabs to be transshipped is the minimum value of the amount that eliminates the excessive supply of slabs. Then, the operator creates simulation data corresponding to this schedule and inputs it to the simulation device 50.
In step S402, the simulation apparatus 50 simulates the entire physical distribution system 1 based on the simulation data input by the operator.

  In step S403, the operator refers to the simulation by the simulation device 50 and determines whether or not there is still an excessive supply state of the slab. If the operator determines that there is an excessive supply state, the process proceeds to step S404, and if the operator determines that there is no excessive supply state, the process proceeds to step S408.

In step S404, the operator makes a schedule to change at least a part of the short truck time slabs loaded on the freight cars 32 on the direct delivery route 21 into the long truck time slabs during the time period when the slabs are predicted to be oversupplied. . This schedule will be described with reference to FIG.
FIG. 10 is a graph showing a slab scheduled to be rolled by the hot rolling mill 3. The vertical axis of FIG. 10 indicates the width of the slab scheduled to be rolled at a predetermined time. For example, the hot rolling mill 3 represents rolling a slab having a width w1 at time t1, rolling a slab having a width w2 at time t2, and rolling a slab having a width w3 at time t3. Further, rolling schedules 100 to 103 respectively represent a set of slabs serving as rolling units, and indicate that rolling is scheduled to be performed by the hot rolling mill 3 in order. It is assumed that rolling schedules 100 to 102 are a set of short track time slabs and rolling schedule 103 is a set of long track time slabs.

  In the hot rolling mill 3, when the rolling of each rolling unit is completed, some or all of the rolling rolls are replaced. Then, as shown in FIG. 10, a slab having a gradually increasing width is rolled for each rolling unit, and thereafter, a slab having a gradually decreasing width is rolled. This makes it possible to sufficiently heat the rolling roll and prevent the strain or the like generated in the rolling roll from affecting the slab.

The operator confirms the amount of short truck time slabs (short truck time slabs to be reduced) corresponding to the number of direct-delivery freight cars that need to be reduced in order to eliminate the excessive supply of slabs. When the amount of the short track time slab to be reduced is about the rolling unit, the operator sets a schedule for changing the rolling schedule 100 to the long track time slab, for example. Therefore, in the example of FIG. 10, the rolling schedule 100 changed to the rolling unit of long track time is scheduled to be rolled after the rolling schedule 102.
Further, when the amount of the short track time slab to be reduced is about half the rolling unit or less, the operator sets a schedule as in the following example. As a first example, a schedule for changing the first half portion 101A of the rolling schedule 101 into a slab with a long track time is set up. As a second example, a schedule for changing the second half 101B of the rolling schedule 101 to a slab with a long track time is set. As a third example, a part 102A, 102B, 102C, 102D of the rolling schedule 102 is evenly extracted from the rolling schedule 102 and a schedule for changing to a long track time slab is set. A slab converted to a long track time slab will be scheduled to be rolled after the short track time slab.

In step S405, the operator sets a schedule for transshipment of the long truck time slab from the freight car 32 on the direct transfer route 21 to the freight car 32 on the bypass route 22 in the intermediate yard 12. The long track time slab to be transshipped here is the slab changed to the long track time slab in step S404. Then, the operator creates simulation data corresponding to the schedule created in steps S404 and S405 and inputs it to the simulation apparatus 50.
In step S406, the simulation device 50 performs a simulation of the entire physical distribution system 1 based on the simulation data input by the operator.

In step S407, the operator refers to the result of the simulation and determines whether or not there is still an excessive supply state of the slab. If the operator determines that there is an excessive supply state, the process proceeds to step S404, and if the operator determines that there is no excessive supply state, the process proceeds to step S408.
In step S408, the operator registers the created schedule in the steelmaking schedule management device 51. As a result, the schedule set by the operator is reflected in the physical distribution system 1.

Next, with reference to FIG. 11, details of the process of the supply shortage elimination schedule in step S105 of FIG. 6 will be described.
In step S500, the operator sets up a schedule for transporting the slabs stored in the intermediate yard 12 to the rolling front yard 11 before the time period when the slab supply shortage is predicted. At this time, based on the above-mentioned transportation priority, a schedule is established in which the slab having a higher transportation priority is preferentially transported to the rolling front yard 11.

  Next, the transport route 20 defined by the operator in step S500 will be described. The operator determines in principle to use the bypass route 22 for the transport route 20 used for transporting the slabs stored in the intermediate yard 12. However, when the slab supply shortage cannot be solved only by carrying the slab by the bypass route 22, the operator determines to use the direct delivery route 21. At this time, the number of direct delivery freight cars should not exceed the threshold value shown in FIG.

How to determine the transport route 20 of the operator in step S500 will be described with reference to FIG. FIG. 12A is an example of a rolling front yard string material stock graph when a slab supply shortage occurs. FIG. 12B is an example of a graph of the number of direct delivery freight cars when a slab supply shortage occurs.
As shown in FIG. 12A, a shortage of 5000 tons of the stringing material slab is predicted at time t5. Then, as shown in FIG. 12B, it is not predicted that the number of direct-delivery freight cars exceeds the threshold value and the slab becomes excessively supplied.
In the state shown in FIGS. 12 (a) and 12 (b), the operator first examines whether or not 5000 tons of the stringed material slab can be transferred from the intermediate yard 12 to the rolling front yard 11 by using the bypass route 22. To do. In the example described here, it is assumed that the slab that can be transported by the bypass route 22 before time t5 is 3000 tons.
At this time, the operator sets up a schedule for transporting the 3000 ton string slab from the intermediate yard 12 to the rolling front yard 11 by using the bypass route 22.
Next, the operator sets up a schedule for transferring the remaining 2000 tons of the tied material slab from the intermediate yard 12 to the rolling front yard 11 using the direct transfer route 21 before time t5. At this time, in order to direct freight car number is not more than the threshold value, as shown in FIG. 12 (c), between the time t4 time t5, as direct freight volume is less than the threshold, the 2000 tons pegging A schedule is set for transporting the material slab from the intermediate yard 12 to the rolling front yard 11 using the direct delivery route 21 .

In step S501, the simulation apparatus 50 simulates the entire physical distribution system 1 based on the simulation data input by the operator. The results of this simulation, direct wagons number graph as shown in FIG. 12 (c), compared with the previous to make a schedule in step S500, and filled the area R1, close to the direct wagons number threshold at time t4~t5 It becomes a value.
In step S502, the operator refers to the simulation result and determines whether or not there is a slab supply shortage condition. If the operator determines that there is a supply shortage condition, the process returns to step S500, and if it determines that there is no supply shortage condition, the process proceeds to step S503.
In step S503, the operator registers the created schedule in the intermediate yard management device 53. As a result, the schedule set by the operator is reflected in the physical distribution system 1.

The slab transportation time in the physical distribution system 1 described above will be described in comparison with the slab transportation time in the physical distribution system as a comparative example.
First, a physical distribution system as a comparative example will be described. Unlike the physical distribution system 1, the physical distribution system as a comparative example does not have the intermediate yard 12 and the bypass route 22. Therefore, the slabs carried out from the steelmaking factory 10 are carried into the rolling front yard 11 in the order of being carried out from the steelmaking factory 10 regardless of the priority of the slab. Therefore, in the physical distribution system as the comparative example, even if the excessive supply or the insufficient supply of the slab is predicted, the excessive supply or the insufficient supply of the slab cannot be eliminated.

Next, with reference to FIG. 13A and FIG. 14A, the slab transportation time and the truck time in the physical distribution system 1 of the present embodiment will be described. FIG. 13A is a diagram showing the slab transportation time of the physical distribution system 1, where the horizontal axis represents the slab transportation time and the vertical axis represents the frequency of slabs transported in the slab transportation time represented by the horizontal axis (the number of slabs). ) Represents. 14 (a) is a diagram showing a track time distribution system 1, the horizontal axis is the track time, and the vertical axis represents the frequency of the slab to be transported by truck time represented by the horizontal axis (number of slab) .
As shown in FIG. 13A, in the physical distribution system 1, the slab transportation time of the short truck time slab is shorter than the slab transportation time of the long truck time slab as a whole. Further, as shown in FIG. 14A, in the physical distribution system 1, the track time of the short track time slab is generally shorter than the track time of the long track time slab. This is because when it is predicted that the physical distribution system 1 will be in an excessive slab supply state, a schedule is set to preferentially supply the short truck time slab to the rolling front yard 11 through the direct route 21. As a result, in the distribution system 1, it is guaranteed that the short truck time slab will arrive at the rolling front yard 11 in a short time.
Further, as shown in FIG. 13A, in the physical distribution system 1, the slab transportation time of the long truck time slab is generally shorter than the slab transportation time of the non-urgent slab. Further, as shown in FIG. 14A, in the physical distribution system 1, the track time of the long track time slab is shorter than the track time of the non-urgent slab as a whole. This is because the emergency slab is basically stored in the intermediate yard 12. This ensures that the long truck time slab has arrived at the rolling front yard 11 when needed.

Next, with reference to FIGS. 13B and 14B, the slab transportation time and the truck time in the distribution system in the distribution system as the comparative example will be described. FIG. 13B is a diagram showing the slab transportation time of a physical distribution system as a comparative example, in which the horizontal axis represents the slab transportation time and the vertical axis represents the frequency of the slabs transported in the slab transportation time represented by the horizontal axis ( Represents the number of slabs). FIG. 14B is a diagram showing a track time of a physical distribution system as a comparative example, in which the horizontal axis represents the track time and the vertical axis represents the frequency of slabs conveyed by the track time represented by the horizontal axis (the number of slabs). ) Represents.
As shown in FIG. 13B, in the physical distribution system of the comparative example, overtaking is not possible, so there is no difference in the transportation time of the short truck time slab, the long truck time slab, and the non-urgent slab. This is because in the distribution system as the comparative example, the slabs carried out from the steelmaking factory 10 are carried into the rolling front yard 11 in the order of being carried out from the steelmaking factory 10 regardless of the priority of the slab. .
In addition, as shown in FIG. 14B, the track slab has a longer track time than other slabs. This is because the non-emergency slab has a longer residence time from when it reaches the rolling front yard to when it is carried into the heating furnace 2, as compared with other slabs. Therefore, in the rolling front yard, the time required for simultaneously storing the low temperature steep slab and the high temperature short track time slab becomes long.

Here, a problem when a slab having a large temperature difference is stored in the rolling front yard 11 will be described. When the high temperature slab and the low temperature slab are stored in the rolling front yard 11, cooling of the high temperature slab is facilitated. For this reason, when rolling a high temperature slab, the heating time in the heating furnace 2 is extended, and problems such as a decrease in heating efficiency occur. However, in the physical distribution system 1, the slab transportation time of the non-urgent slab is longer than the slab transportation time of the short truck time slab and the long truck time slab as a whole. This is because, in the physical distribution system 1, the non-urgent slab, which has a relatively low temperature, is stored in the intermediate yard 12 in principle. As a result, the rolling front yard 11 can be made in a state in which there are few non-urgent slabs and can be operated with low inventory. Therefore, it is possible to prevent the slab having a large temperature difference from being stored in the rolling front yard 11. Further, the work load of the crane on the rolling front yard 11 can be reduced.
Then, the emergency slab stored in the intermediate yard 12 is carried into the rolling front yard 11 when it becomes a stringing material slab. As a result, it is possible to prevent material shortage while operating the rolling front yard 11 with low inventory.
As described above, in the distribution system 1, the shortage of material is prevented, the occurrence of congestion on the transportation route 20 is suppressed, the supply balance of slabs is maintained, and the slabs with high priority are preferentially transferred to the rolling front yard 11. You can carry it in.

<Other embodiments>
In the above-described embodiment, when the excessive supply of the slab is predicted, the operator sets a schedule to move the long truck time slab from the direct route 21 to the bypass route 22 in at least one of steps S401 and S405 of FIG. However, depending on the situation of the transport route 20, in steps S401 and S405, a schedule may be set up in which the short track time slab is moved from the direct delivery route 21 to the bypass route 22 instead of the long track time slab.
For example, in a time zone when it is predicted that the slab will be oversupplied, the number of freight cars 32 loaded with the short truck time slab on the direct delivery route 21 (first number) and the long truck time slab on the direct delivery route 21 are loaded. The number of the loaded freight cars 32 (the second number) is compared. Then, when the operator determines that the first number is less than the second number, the operator sets a schedule as follows. That is, the schedule for transferring the short truck time slab from the freight car 32 on the direct delivery route 21 to the freight car 32 on the bypass route 22 at the intermediate yard 12 and transporting the short truck time slab to the rolling front yard 11 by the bypass route 22 is set. Stand up.
As a result, the short truck time slab is carried to the rolling front yard 11 by the free route 21 or the bypass route 22. Therefore, the slab transportation time of the short track time slab can be shortened.

  Further, in the above embodiment, the bypass route 22 is not connected to the steelmaking factory 10. However, the bypass route 22 may be connected to the steel mill 10. At this time, instead of setting a schedule for moving the long track time slab to the bypass route 22 in steps S401 and S405 of FIG. 9, the operator may set a schedule as follows. That is, the operator does not transfer the long truck time slab from the freight car 32 on the direct transfer route 21 to the freight car 32 on the bypass route 22 at the intermediate yard 12, but directly conveys it from the steelmaking factory 10 to the bypass route 22. You may set a schedule for. This eliminates the need to transship long truck time slabs in the intermediate yard 12, so the work load of the crane in the intermediate yard 12 can be reduced.

In addition, in the above-described embodiment, the transport route 20 includes two routes, a direct transport route 21 and a bypass route 22. However, the transport route 20 may include three routes, that is, the direct delivery route 21, the first bypass route, and the second bypass route. The first bypass route and the second bypass route are routes that connect the intermediate yard 12 and the rolling front yard 11.
Also in the physical distribution system of the present embodiment, the slab is carried out from the steelmaking factory 10 by the direct delivery route 21. Then, the emergency slab is lowered and stored in the intermediate yard 12. When it is predicted that the physical distribution system of the present embodiment will have an excessive supply of slabs, the long truck time slab loaded on the freight car 32 of the direct route 21 is transferred to the freight car 32 of the first bypass route, and the rolling front yard 11 Set up a schedule for transportation. Further, when it is predicted that the physical distribution system of the present embodiment will be in short supply of slabs, a schedule for transporting the slabs in the intermediate yard 12 to the rolling front yard 11 by the second bypass route is set up.
As a result, the long truck time slab when it is predicted to be over-supplied and the slab carried out from the intermediate yard 12 pass through different routes. Therefore, the reliability of stable supply of slabs increases.

Further, in the above-described embodiment, the number of direct-delivery freight cars is used to detect the disruption of the slab supply balance. The number of direct delivery freight cars is the number of freight cars 32 on which the slabs are loaded and on the direct delivery route 21. Here, the number of freight cars 32 on which the slabs are loaded is an example of a transport unit. The transport unit is one of a collection of slabs that are transport items, and the transport items are managed and transported on the transport route 20 for each transport unit. For example, when a slab is transported by a conveyor instead of the train 30, a group of slabs that are managed and transported as one unit on the conveyor is one transport unit. Therefore, the number of transport units on the direct delivery route 21 can be used to detect the disruption of the slab supply balance.
Further, in the above-described embodiment, the operator performs the detection of the imbalance in the supply balance of the slab and the creation of the schedule. However, all or part of the processing performed by the operator may be performed by the computer system such as the simulation device 50.
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. It can also be realized by the processing. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

  Although the present invention has been described along with the embodiments, the above embodiments merely show examples of embodying the present invention, and thus the technical scope of the present invention is construed in a limited manner. 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 physical distribution system, 2 heating furnaces, 3 hot rolling mills, 10 steel mills, 11 rolling front yards, 12 intermediate yards, 20 transfer routes, 21 direct transfer routes, 22 bypass routes

Claims (16)

The starting point for the transported items,
The arrival base of the goods,
A transport route including a first route that is a route that connects the departure point and the arrival point, and a second route that is a route that can reach the arrival point;
An intermediate base that can temporarily store the conveyed goods from the departure base to the arrival base,
A transport schedule generation method in a physical distribution system , comprising: a prediction unit that predicts at least one of a state of the first route and a state of the arrival base ,
A detection step of detecting an unbalance of the supply balance of the conveyed objects based on the prediction of the prediction means;
Priorities are set for the conveyed items depending on whether or not the conveyed items are incorporated in the processing schedule at the arrival point, and when the imbalance in the supply balance of the conveyed items is detected in the detection step, the priority is set for the conveyed items. Based on the intermediate base and the transport route, a schedule step of establishing a transport schedule that eliminates the disruption of the supply balance of the transported goods based on the intermediate base and the transport route. Conveyed, the classified by whether built into the processing schedule arrival locations, the ones incorporated in the processing schedule of arrival base for further transfer time from the starting site until the arrival bases The transport schedule generation method according to claim 1, wherein the transport schedule generation method is classified according to the length of the track time including the, and the priority is determined according to the classification . The conveyed item has one of the first priority and the priority lower than the first priority,
In the schedule step, when an excessive supply of the conveyed goods is detected in the detection step, a conveyance schedule for preferentially conveying the conveyed goods of the first priority to the arrival point is established, and the conveyed goods are supplied in the detecting step. If the shortage is detected, the transfer schedule generating method according to claim 1 or 2, characterized in that to make a transfer schedule for conveying a conveyance object that is stored in the intermediate site to the arrival base. Wherein the detection step, using a number of collection and is transported units conveyed in the first route, which is predicted by the prediction means, any of claims 1 to 3, characterized in that for detecting the collapse of the supply balance A method of generating a transfer schedule according to item 1 . The transport schedule generation method according to claim 4 , wherein in the detection step, when the number of the transport units is equal to or larger than a first threshold value set in advance, it is determined that there is an excessive supply of the transported products . In the detection step, the number of the transport units is less than a predetermined second threshold value, and the amount of the transport object of the predetermined priority at the arrival base predicted by the prediction unit is predetermined. The transport schedule generation method according to claim 4, wherein the transport schedule is determined to be insufficient when the transport threshold is less than the determined third threshold. In the schedule step, when an excessive supply of the conveyed goods is detected in the detection step, at least a part of the conveyed goods which is not the first priority is carried out by a route different from the route in which the conveyed goods of the first priority are conveyed. The transfer schedule generating method according to claim 3 , wherein a transfer schedule is set so as to transfer the transfer schedule . In the schedule step, when an excessive supply of the conveyed goods is detected in the detection step, at least a part of the conveyed goods of a priority other than the first priority conveyed by the first route, or the first route 7. A transportation schedule is set up so that at least a part of the first-priority transported material transported by the above is moved from the first route to the second route and transported by the second route. 7. The transfer schedule generation method according to 7 . In the schedule step, when an excessive supply of the conveyed goods is detected in the detection step, at least a part of the conveyed goods of the first priority is reclassified into a priority lower than the first priority, and a conveying schedule is established. The transport schedule generation method according to any one of claims 3, 7 and 8 , characterized in that. In the schedule step, when a supply shortage of the transported object is detected in the detection step, a transportation schedule for carrying out a highly prioritized transported object stored in the intermediate base to the arrival base is established. The transport schedule generating method according to any one of claims 3 to 9 , characterized in that. Conveyed goods are classified according to whether or not they are included in the processing schedule at the arrival point, and those that are included in the processing schedule at the arrival point further include the transfer time from the departure point to the arrival point. Classified by the length of track time including
10. The transportation schedule generation method according to claim 3 , wherein the transported material of the first priority is a transported material classified as having a short track time. The transport schedule for storing a low-priority transported material in the intermediate base is established in the schedule step based on the storage capacity of the intermediate base, The transfer schedule according to any one of claims 3 to 11 , wherein Transfer schedule generation method. The starting point for the transported items,
The arrival base of the goods,
A transport route including a first route that is a route that connects the departure point and the arrival point, and a second route that is a route that can reach the arrival point;
An intermediate base that can temporarily store the conveyed goods from the departure base to the arrival base,
Prediction means for predicting at least one of the state of the first route and the state of the arrival point,
A detection means for detecting an unbalance of the supply balance of the conveyed article based on the prediction of the prediction means;
Priorities are set for the conveyed items depending on whether or not the conveyed items are incorporated in the processing schedule at the arrival point, and when the detection means detects an imbalance in the supply balance of the conveyed items, the priority is set for the conveyed items. based on the intermediate base, and, distribution system using the transport route, characterized in that it comprises a scheduling means to make a transfer schedule to eliminate collapse of the supply balance of the conveyed object. 14. The physical distribution system according to claim 13 , wherein the predicting unit predicts the number of transport units, which is a collection of transport items on the first route. The physical distribution system according to claim 13 or 14 , wherein the predicting unit predicts an amount of a conveyed material having a predetermined priority at the arrival base. The starting point for the transported items,
The arrival base of the goods,
A transport route including a first route that is a route that connects the departure point and the arrival point, and a second route that is a route that can reach the arrival point;
An intermediate base that can temporarily store the conveyed goods from the departure base to the arrival base,
A program for generating a transportation schedule in a physical distribution system including:
A prediction step of predicting at least one of the state of the first route and the state of the arrival point;
A detection step of detecting a disruption in the supply balance of the conveyed objects based on the prediction of the prediction step;
Priorities are set for the conveyed items depending on whether or not the conveyed items are incorporated in the processing schedule at the arrival point, and when the imbalance in the supply balance of the conveyed items is detected in the detection step, the priority is set for the conveyed items. based on the intermediate base, and, using the transport route, a program for executing a scheduled steps to make a transfer schedule to eliminate collapse of the supply balance of the conveyed object, to the computer.

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