JP2005053661A - Physical distribution system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a physical distribution system easily constructed and equipped with automated warehouses 11 and 12 having a first conveying apparatus 4 carrying in and out two workpieces with respect to a plurality of housing parts 3 simultaneously and a second conveying apparatus 71 and a third conveying apparatus 72 conveying the workpieces one by one between an arrival station (arrival ST) 41 and accepting parts 51 to 58 of the automated warehouse and between delivery parts 61 to 68 of the automated warehouse and a shipping station (shipping ST) 42. <P>SOLUTION: Following control is carried out: the workpiece is detected by the arrival ST 41, and a conveying passage to the empty accepting parts 51 to 58 is indicated to the second conveying apparatus 71; two of the workpieces are detected by the accepting parts 51 to 58, and a conveying passage to the vacant housing part 3 is indicated to the first conveying apparatus 4; the housing part 3 to be delivered is specified, and a conveying passage to the empty delivery parts 61 to 68 is indicated to the first conveying apparatus 4; and the workpiece is detected by the delivery parts 61 to 68, and a conveying passage to the shipping ST4 is indicated to the third conveying apparatus 72. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a configuration of a logistics system using an automatic warehouse.

  In recent years, automatic warehouses have been widely used against the background of the consolidation of distribution bases for the purpose of improving distribution costs and distribution efficiency and the spread of high-mix low-volume production accompanying diversification of user needs.

  Conventionally, an automatic warehouse equipped with a storage unit for storing loads, a transfer device for transporting loads (a tracked carriage or an automated guided vehicle), and a plurality of work conveyors (load receiving conveyors, An automatic warehouse system equipped with an unloading conveyor has been proposed.

  In this automatic warehouse system, the work carried into the receiving station is transported to the load receiving conveyor by the transport body, and the work on the load receiving conveyor is transported to the storage unit by a transport device (for example, a stacker crane). And the workpiece | work delivered from a storage part is once conveyed to a unloading conveyor with a stacker crane etc., and is conveyed to a shipping station via an appropriate conveyance body from an unloading conveyor.

  In such an automatic warehouse system, the management computer creates a transfer route from the receiving station to the empty storage unit at the time of receipt, and creates a transfer route from the specific storage unit to the shipping station at the time of delivery. Then, the management computer conveys the workpiece while exchanging instructions / reports with each of necessary devices (such as a conveyance device and a work conveyor) based on the created conveyance route, and performs tracking management of the workpiece.

  Here, some automatic warehouses are installed in the middle with the aim of buffering inconsistencies in the operation time of the upstream line and the downstream line and deviations in production capacity. In the case of such an automatic warehouse system having a strong buffer meaning, it is often necessary to automatically and continuously enter and exit.

  In order to realize system labor saving and 24-hour continuous operation in such an automatic warehouse, an information display section indicating the load information is provided on each work or pallet with a barcode or the like. In some cases, the information display unit is read by a reading device, and the management computer creates tracking information using the acquired cargo information. When the work is stored in the storage unit, the management computer creates inventory information based on the load information and the position information of the storage unit in which the work is stored. Based on this inventory information, the shipping timing can be determined, and the workpiece can be delivered from the storage unit and supplied from the shipping station to the downstream line.

  When the downstream line is an assembly line, etc., there are often restrictions on the order of the workpieces that flow through the line (for example, the constraints that the workpiece B must always flow after the workpiece A). On the other hand, it is necessary to transport the workpieces in the order. In this case, based on the tracking information described above, the order of the workpieces arriving at the shipping station is controlled by controlling the operation instruction for one transport path over the operation instruction for the other transport path. doing.

Here, due to installation space and loading / unloading capabilities, a stacker crane of a type that transports multiple workpieces on the receiving conveyor to the storage unit at the same time when entering the warehouse, and simultaneously conveys multiple workpieces from the storage unit to the loading conveyor at the time of delivery. Etc. may be adopted. For example, Patent Document 1 discloses a stacker crane capable of transferring a plurality of loads at the same time.
JP 2002-68425 A

  When a stacker crane capable of transferring a plurality of workpieces at the same time is used in an automatic warehouse system, the workpieces are transported one by one from the receiving station to the cargo receiving conveyor, and two from the cargo receiving conveyor by the stacker crane. The two parts of the storage part are collectively conveyed to the unloading conveyor and are conveyed one by one from the unloading conveyor to the shipping station.

  In this case, when an attempt is made to create and control a transport path from the receiving station to the empty storage unit at the time of warehousing, the control becomes very complicated. That is, one workpiece is transported to the cargo receiving conveyor at the time of warehousing, and after waiting for another workpiece to arrive at the cargo receiving conveyor, two pieces are transported together to the storage unit by the stacker crane. Become. Accordingly, it is necessary to perform a process of integrating the transport paths originally created for each work piece at the point of the cargo receiving conveyor as a transport path of two. Since it is necessary to perform such complicated processing, the cost of system construction increases, the load on the management computer increases, and the time required for arrival increases.

  In addition, when a delivery route from the storage unit to the shipping station is simply created and controlled at the time of delivery, control difficulties are similarly involved. In other words, the stacker crane conveys two pieces from the storage unit to the unloading conveyor in a batch, but each piece of work is conveyed from the unloading conveyor to the shipping station. Therefore, it is necessary to separate the conveyance paths that were originally created in one by two for each workpiece and re-create the conveyance paths. Such processing is complicated and increases the cost of system construction. In addition, the load on the management computer increases, and the time required for shipment increases.

  Further, when there is a restriction on the order in which the workpieces are transported to the shipping station, in order to ship the workpieces according to the order, information on which workpieces have been transferred from the storage unit to which unloading conveyor is required. For this purpose, it is not sufficient to know only what and what works are placed in each storage unit. That is, it is necessary to manage information on where the first workpiece is placed and where the second workpiece is placed in each storage unit.

  This becomes a factor that increases the difficulty in correcting (maintenance) information due to an abnormality occurring in the system for some reason. In other words, since it is necessary to have data on where and what work is placed in each storage unit, the amount of work to be corrected increases as the amount of data increases, and the system downtime increases and efficiency decreases. End up. In particular, in the case of an automatic warehouse in which the number of workpieces scooped and transported simultaneously by a stacker crane is as large as 5 or 10, maintenance work becomes extremely difficult.

  Due to the difficulty of such maintenance work, mistakes are likely to occur during data correction. Such a mistake causes a transport path to be created based on incorrect data when the system is operated again, causing the workpiece to flow in the wrong order on the downstream line.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  That is, in the first invention, an automatic warehouse having a first transfer device that simultaneously loads and unloads x pieces of workpieces to and from a large number of storage units is connected to a receiving station and a receiving unit of the automatic warehouse. The second transport device that transports y workpieces (where y ≠ x) at the same time, the unloading unit of the automatic warehouse, and the shipping station are connected, and z workpieces (where z ≠ x) are transported simultaneously. In a physical distribution system including three transport devices and a management control unit that gives instructions to the first to third transport devices to perform transport control, the management control unit detects y workpieces at a receiving station. The first control that creates a transfer route with the empty warehousing unit as the transfer destination and instructs the second transfer device to transfer the y workpieces, and x warehousing units in the warehousing unit. Free space when workpiece is detected The second control for creating a transport path with the storage section in the state as the transport destination and instructing the first transport device to transport the x workpieces to the storage section, and the storage section to be unloaded are identified. A third control that creates a transport route with the unloading part in the empty state as a transport destination and instructs the first transporting device to transport x workpieces in the storage part to the unloading part; When the z number of workpieces is detected, a transfer path having the shipping station as a transfer destination is created, the third transfer device is instructed, and the fourth control is performed to transfer the z number of workpieces. Is.

x, y, and z are integers of 1 or more. When x is 1, if only one workpiece is transported, it is transported “simultaneously”. The same applies when y and z are 1.
The order of the control of the first to fourth controls is arbitrary, and for example, a configuration in which the third control is performed after the fourth control may be performed, and the first to fourth controls are performed simultaneously in parallel. It may be what is called.

According to this configuration, in the first control, when y pieces of workpieces are detected at the arrival station, a transport path with the storage unit as the transport destination is not created, and in the third control, the storage unit to be unloaded. When is identified, a transport route with the shipping station as the transport destination is not created. In other words, the conveyance path is not created so as to straddle the warehousing unit and the warehousing unit (where the number of workpieces conveyed at one time changes). Therefore, the creation process of the transport route is simplified and the control load is reduced.
The first control simply creates a transfer route on the condition that y pieces of workpieces are detected at the receiving station, and the second control simply sets the transfer route on the condition that x pieces of workpieces are detected in the storage unit. Create Therefore, it becomes easy to perform the first control and the second control independently of each other. Similarly, it is easy to perform the third control and the fourth control independently of each other. In this way, each control independently creates a transport route that is divided from the warehousing part and the leaving part and controls each transport device, eliminating the need for transport route aggregation / division processing. Simplified. Therefore, it is possible to reduce the man-hours and time costs required for constructing the physical distribution system.
Furthermore, due to the independence of each control, it is easy to avoid that a fault that has occurred in one control spills over to another control, and the ease of fault recovery is ensured.

  In the second invention, the management control means obtains individual information of the x pieces of workpieces detected by the warehousing unit in the second control, and after conveying the x pieces of workpieces to the storage unit Uses the information to create inventory information of an automatic warehouse, and in the third control, when the storage unit to be delivered is specified, it is specified using the inventory information.

  According to this configuration, the inventory information of the automatic warehouse can be appropriately created, and the order of delivery from the storage unit of the automatic warehouse can be appropriately determined using the inventory information. Therefore, even when there is a restriction on the order of works to be shipped from the shipping station, it is easy to ship the works appropriately.

  In the third aspect of the invention, a reading device that reads information on each of the x pieces of workpieces is disposed in the warehousing unit, and the management control unit is configured to provide each of the x pieces of workpieces in the warehousing unit in the second control. The information is acquired by the reading device.

  According to this configuration, since the inventory information is created using the workpiece information read by the reading device of the warehousing unit, the independence of the second control can be further enhanced. Therefore, it is possible to improve the ease of recovery from a failure.

  In a fourth aspect of the invention, a reading device for reading workpiece information is disposed in the receiving station, and the management control means acquires the workpiece information of the receiving station by the reading device in the first control. The information is recorded together with information about which warehousing part the work has been transported to, and in the second control, information on each of the x pieces of work in the warehousing part is acquired based on the recording. It is.

  According to this configuration, it is not necessary to provide a reader in the warehousing unit, and the manufacturing cost of the system can be reduced. This effect becomes remarkable when there are many warehousing parts.

  In a fifth aspect of the present invention, a reading device for reading workpiece information is disposed in the first transport device, and the management control means is configured to determine that the x pieces of workpieces detected by the warehousing unit are the second control. When transported by one transport device, information on each of the x workpieces is acquired by the reading device.

  According to this configuration, it is not necessary to provide a reader in the warehousing unit, and the manufacturing cost of the system can be reduced. This effect becomes remarkable when there are many warehousing parts. Moreover, since the inventory information is created using the workpiece information read by the reading device of the first transport device, the independence of the second control can be further enhanced. Therefore, it is possible to improve the ease of recovery from a failure.

  In a sixth aspect of the present invention, x ≧ 2, and the automatic warehouse is provided with a plurality of delivery units. The delivery unit is provided with a reading device for reading workpiece information, and the management control means includes the first control unit. In 4 control, while the information of the workpiece | work detected in the delivery part is acquired by the said reader, in 4th control, it is based on the said information in which delivery part has arrived the order which should be shipped. A delivery route having the delivery unit to which the unloading part to which the workpieces that have arrived belong belong belongs is created and the delivery destination is the delivery destination, and the third delivery device is instructed.

According to this configuration, even when there is a restriction on the order of the workpieces shipped from the shipping station, the workpieces can be shipped appropriately. In addition, since the inventory information of the automatic warehouse is not used to determine the order, the inventory information data can be simplified. Therefore, maintenance work is easy even when a failure occurs.
In addition, since the order is determined using the workpiece information read by the reading device of the warehousing unit, the independence of the fourth control can be further enhanced, and the recoverability when a failure occurs is excellent.

  In a seventh aspect of the invention, x ≧ 2, the automatic warehouse is provided with a plurality of delivery units, a reading device for reading individual information of a work is provided in the first transport device, and the management control means In the third control, when the first transfer device transports x workpieces to the shipping section, the reader acquires individual information of the workpiece, and the information is transferred to each shipping section. It is recorded together with information on whether it has been transported, and in the fourth control, it is checked on the basis of the information that the work that has arrived in the order to be shipped is based on the information, and the delivery part to which the work that has arrived in order belongs Is generated as a transfer source, and a transfer route is set as a transfer destination, and the third transfer device is instructed.

According to this configuration, even when there is a restriction on the order of the workpieces shipped from the shipping station, the workpieces can be shipped appropriately. In addition, since the inventory information of the automatic warehouse is not used to determine the order, the inventory information data can be simplified. Therefore, maintenance work is easy even when a failure occurs.
In addition, it is not necessary to dispose a reading device in the exit section, and the manufacturing cost of the system can be reduced. This effect is significant when there are a large number of delivery parts.

Next, embodiments of the invention will be described.
FIG. 1 shows a physical distribution system 1 that conveys various loads such as automobile parts. The physical distribution system 1 includes a first automatic warehouse 11 and a second automatic warehouse 12 arranged side by side.

  As shown in FIG. 1, an arrival station 41 is provided on one side of the distribution system 1, and a first tracked carriage 71 is provided to convey the work of the arrival station 41. Eight load receiving conveyors 51 to 58 are installed on the receiving station 41 side of the two automatic warehouses 11 and 12. The first tracked carriage 71 has a track 81 so as to straddle the front portions of the load receiving conveyors 51 to 58. The first tracked carriage 71 receives one workpiece placed on the receiving station 41, travels along the track 81, and among the load receiving conveyors 51 to 58, the target load receiving conveyor (for example, the first load receiving truck). It moves in front of the conveyor 51), and it is comprised so that a workpiece | work can be mounted on the said cargo receiving conveyor 51 concerned.

  The first and second automatic warehouses 11 and 12 have the same configuration. Specifically, a pair of frame shelves 2a and 2b are provided, and each frame shelf 2a and 2b is provided with a plurality of storage portions 3 for storing loads. A traveling rail 83 in a direction perpendicular to the track of the first tracked carriage 71 is laid between the frame shelves 2a and 2b. A stacker crane (conveying moving body) 4 that conveys the workpiece is provided so as to be able to travel along the traveling rail 83.

  The said goods receiving conveyors 51-58 are provided in each front part of the frame shelves 2a and 2b of the first and second automatic warehouses 11 and 12. Two of these cargo receiving conveyors 51 to 58 are provided close to each other for each of the frame shelves 2a and 2b. More specifically, the first and second conveyor pairs (51, 52) are installed close to each other in front of the frame shelf 2a of the first automatic warehouse 11, and the number 3 in front of the frame shelf 2b. And the fourth conveyor pair (53, 54) are installed close to each other. Each of the cargo receiving conveyors 51 to 58 can convey one work per unit.

  In the first and second automatic warehouses 11 and 12, a total of eight unloading conveyors 61 to 68 are provided, two at the rear of each of the frame shelves 2a and 2b. The unloading conveyors 61 to 68 are provided in close proximity to each other in each of the frame shelves 2a and 2b in the same manner as the unloading conveyors 51 to 58.

  Each storage unit 3 of the first and second automatic warehouses 11 and 12 stores a total of two works, one for the storage unit 3, one on the front side and one on the back side when viewed from the stacker crane 4. be able to.

  The stacker crane 4 receives a work placed on each of two load receiving conveyors adjacent to each other (for example, the first load receiving conveyor 51 and the second load receiving conveyor 52) in a group of two. It can be collectively conveyed to the target storage unit 3 and stored (warehousing). Further, the stacker crane 4 receives and conveys two works in the target storage unit 3 together, and two unloading conveyors adjacent to each other (for example, a third cargo receiving conveyor 63 and a fourth cargo receiving conveyor 64). Can be placed so that one workpiece is placed at a time (shipping).

  In order to convey the work of the unloading conveyors 61 to 68 to the shipping station 42, a second tracked carriage 72 is provided. The second tracked carriage 72 has a track 82 so as to straddle the rear part of the unloading conveyors 61-68. The second tracked carriage 72 receives one workpiece placed on a target conveyor (for example, the fourth unloading conveyor 64) among the unloading conveyors 61 to 68, and the shipping station 42 along the track 82. And the workpiece can be placed on the shipping station 42.

  The distribution system 1 includes a tracked truck control panel 31 for controlling the first tracked carriage 71 and the second tracked carriage 72, and a conveyor for controlling the load receiving conveyors 51-58 and the unloading conveyors 61-68. A control panel 32 and a crane control panel 33 for controlling the stacker crane 4 are provided.

  Although not shown, load information is attached to the appropriate position of the work with a barcode. This cargo information includes a work ID number unique to each work. Known bar code readers (reading devices) R1 to R3 are installed in the receiving station 41, the receiving conveyors 51 to 58, and the unloading conveyors 61 to 68, and the bar code attached to the work is read to obtain the load information. It can be acquired. This cargo information is transmitted from the conveyor control panel 32 to the management computer 34.

  In this embodiment, in principle, the work arrives at the arrival station 41 in ascending order of ID numbers. That is, the work having the ID number 1 first arrives at the receiving station 41, and subsequently, the work having the ID number 2 arrives at the receiving station 41.

  In the present embodiment, the receiving conveyors 51 to 58 constitute a receiving part of the automatic warehouses 11 and 12, and the unloading conveyors 61 to 68 constitute a leaving part of the automatic warehouse, respectively. Further, the stacker crane 4 corresponds to the first transfer device, the first tracked carriage 71 corresponds to the second transfer device, and the second tracked carriage 72 corresponds to the third transfer device.

  Next, the electrical configuration of the physical distribution system will be described with reference to FIG. The management computer 34 manages the inventory of each of the automatic warehouses 11 and 12 and sends a conveyance command for conveying the workpiece to the destination to each of the control panels 31 to 33. The management computer 34 includes a central processing unit (CPU) 35, a read only memory (ROM) 36, a read / write memory (RAM) 37, and a hard disk drive (HDD) 38. The CPU of the management computer is connected to the tracked vehicle control panel 31, the conveyor control panel 32, and the crane control panel 33 via the input / output interface 39.

  The management computer 34 constitutes a management control means, and includes the CPU 35, the ROM 36, the RAM 37, the input / output interface 39, and the like, the first to fourth programs described later stored in the HDD 38, and the like. The first to fourth controls are realized.

  As shown in FIG. 3, a storage area used by the first to fourth programs is secured in the RAM. The HDD 38 has a storage area for storing the inventory information data of the automatic warehouses 11 and 12.

The first program will be described.
As shown in FIG. 4 as a flow chart, when processing is started in the first program, first, a signal waiting state from the conveyor control panel 32 is entered (S101). The conveyor control panel 32 is configured to transmit a signal (arrival signal) to the management computer 34 when a sensor (not shown) detects that a workpiece has arrived at the arrival station 41. This arrival signal includes the work ID number read by the barcode reader R1 of the arrival station 41. In the first program, no loop is performed until this signal is received (S101).

  When receiving the arrival signal from the conveyor control panel 32, the management computer 34 sends an inquiry signal to the conveyor control panel 32, and any of the eight load receiving conveyors 51 to 58 is in an empty state (the work is performed by the first tracked carriage 71). Is in a state in which it can be placed). Based on the obtained information, the management computer 34 assigns one of the empty consignment conveyors as the work transfer destination of the receiving station 41 (S102). Although the allocation method is arbitrary, in this embodiment, the first workpiece is the first cargo receiving conveyor 51, the second workpiece is the second cargo receiving conveyor 52,... A method of assigning ˜58 one by one in order is adopted. Here, it is assumed that the first cargo receiving conveyor 51 is assigned.

  Then, the management computer 34 creates transfer path information with the arrival station 41 as the transfer source and the assigned load receiving conveyor (the first load receiving conveyor 51) as the transfer destination (S103). Then, the transport command data including the transport path information is transmitted to the tracked vehicle control panel 31 (S104), and a signal indicating that the transport is completed (transport completion signal) is transmitted from the tracked cart control panel 31. (S105).

  Upon receipt of the conveyance command data from the management computer 34, the tracked vehicle control panel 31 controls the first tracked vehicle 71 according to the transfer route information, scoops the work of the receiving station 41, and transfers it to the first load receiving conveyor 51. To do. After the transportation, the tracked cart control panel 31 transmits a transportation completion signal to the management computer.

  When the transfer completion signal is received from the tracked cart control panel 31, one transfer control in the first program is completed. After that, it returns to step S101 again and repeats the same processing.

  The conveyor control panel 32 constantly monitors whether or not there is a workpiece on the first tracked carriage 71 side for each of the first to eighth cargo receiving conveyors 51 to 58 by a sensor (not shown). When it is detected by the first tracked carriage 71 that a workpiece is placed on any of the cargo receiving conveyors 51 to 58 (for example, the first cargo receiving conveyor 51), the automatic warehouse 11 and 12 side of the cargo receiving conveyor 51 Whether a workpiece is present or not is constantly monitored by a sensor (not shown). When it is detected that there is no workpiece on the automatic warehouses 11 and 12, the load receiving conveyor 51 is driven to convey the workpieces from the first tracked carriage 71 side to the automatic warehouses 11 and 12, and the stacker crane 4 To move the workpiece to a position where it can be scooped.

The second program will be described.
As shown in FIG. 5 as a flow diagram, when processing is started in the second program, first, an arrival signal from the conveyor control panel 32 is waited (S201). The conveyor control panel 32 is placed on any one of the first to eighth load receiving conveyors 51 to 58 (for example, the second load receiving conveyor 52), and the workpiece can be picked up by the stacker crane 4. When moving, a signal to that effect (arrival signal) is transmitted to the management computer 34. The arrival signal includes information on the number of the consignment conveyor (in this case, “No. 2”) and the ID number of the work read by the barcode reader R2 of the consignment conveyor 52 (for example, “382”). It is.

  As shown in FIG. 3, the second program stores the presence / absence of workpieces on the first to eighth conveyors 51 to 58 in the RAM 37 and, if there are more workpieces, the ID number of the workpiece. A storage area is secured for storing. The management computer 34 that has received the arrival signal from the conveyor control panel 32 rewrites the contents of the RAM 37 from “no work” to “with work” with respect to the presence / absence of the work on the receiving conveyor of the number, and the work ID. The number is written (S202). In the above case, the content of the second cargo receiving conveyor 52 is updated from “no workpiece” to “work present”, and “382” is written in the ID number.

  Next, the management computer checks the state of the RAM 37 and forms a pair with the conveyor of the number updated to “with work” (for example, No. 1 for No. 2 and No. 6 for No. 5). No.) is checked whether there is a workpiece (S203).

  In the process of step S203, when the state of the other conveyor (here, the first cargo receiving conveyor 51 paired with the second cargo receiving conveyor 52) is “no workpiece”, the process returns to step S201 again to control the conveyor. Wait for a new arrival signal from board 32.

  On the other hand, when the state of the first cargo receiving conveyor 51 is “work is present”, this means that the workpiece is placed on both the first and second cargo receiving conveyors 51 and 52 that are paired with each other, and the stacker crane 4 simultaneously This means that two workpieces can be transported. That is, it means that two workpieces are detected on the cargo receiving conveyors 51 and 52. In this case, the management computer 34 searches the inventory information data (see FIG. 3) stored in the HDD 38 and assigns one empty storage unit 3 (S204). This time, it is assumed that the storage unit No. 135 is empty and assigned.

  Then, the management computer 34 creates transport path information using the first and second conveyors 51 and 52 as the transport source and the allocated storage unit 3 (the 135th storage unit 3) as the transport destination (S205). Then, the conveyance command data including this information is transmitted to the crane control panel 33 (S206), and the system waits for a conveyance completion signal to be transmitted from the crane control panel 33 (S207).

  The crane control panel 33 that has received the conveyance command data scoops one workpiece on the first cargo receiving conveyor 51 and one workpiece on the second cargo receiving conveyor 52 at the same time, and stores the scooped two workpieces in No. 135. It is transported to the section 3 and placed in the 135th storage section 3. After the storage operation is completed, the crane control panel 33 transmits a conveyance completion signal to the management computer 34.

  The management computer 34 that has received the transfer completion signal accesses the inventory information data in the HDD 38, and stores the number 1 stored in the RAM 37 in the allocated storage unit 3 (the storage area corresponding to the 135th storage unit). Inventory information is created by writing the work ID numbers (two pieces, ie, “381” and “382”) on the second receiving conveyors 51 and 52 (S208). Further, the states of the first and second conveyors stored in the RAM 37 are both rewritten to “no work”, and the stored ID numbers are deleted (S209).

  Thus, one transport control in the second program is completed. After that, it returns to step S201 again and repeats the same processing.

The third program will be described.
As shown in FIG. 6 as a flow diagram, when processing is started in the third program, it is first determined whether or not it is currently possible to flow a work to the downstream line (S301). This determination uses information such as whether or not the downstream line is in operation and the processing capacity of the downstream line. If it is inconvenient to flow the workpiece, the loop processing in step S301 is repeated, and it waits until the workpiece can be delivered.

  If it is determined that the workpiece can be delivered, the management computer 34 searches the inventory information data in the HDD 38 to identify the storage unit 3 in which the workpiece having the smallest ID number is stored (S302). . Here, it is assumed that the first storage unit is specified as a result of the search.

  Next, the management computer 34 sends an inquiry signal to the conveyor control panel 32 and acquires which of the eight unloading conveyors 61 to 68 is in an empty state. Then, the management computer 34 allocates a pair of unloading conveyors that are both empty based on the obtained information (S303). For example, when the 3rd and 4th unloading conveyors 63 and 64 are empty, they are assigned. When assigning, for example, it is considered that the stacker crane of the first automatic warehouse 11 can only place a load on the first to fourth unloading conveyors 61 to 64.

  The management computer uses the identified storage unit 3 (No. 1 storage unit 3) as the transfer source and the assigned unloading conveyor pair (No. 3 and No. 4 unloading conveyors 63 and 64) as the transfer destination. Transport route information is created, transport command data including this information is transmitted to the crane control panel 33 (S304), and the system waits for a transport completion signal to be sent from the crane control panel 33 (S305).

  The crane control panel 33 that has received the conveyance command data scoops the two workpieces stored in the first storage unit 3 at the same time, and the target unloading conveyor (the third and fourth unloading conveyors 63 and 64). ), One workpiece is placed on the third unloading conveyor 63, and another workpiece is placed on the fourth unloading conveyor 64, respectively. After the storage operation is completed, the crane control panel 33 transmits a conveyance completion signal to the management computer 34.

  The management computer 34 that has received the transfer completion signal accesses the inventory information data in the HDD 38 and deletes the inventory information indicating that a work is in the transfer source storage unit 3 (first storage unit) (S306).

  Thus, one transport control in the third program is completed. After that, it returns to step S301 again and repeats the same processing.

  The conveyor control panel 32 constantly monitors whether or not workpieces are placed on the automatic warehouses 11 and 12 for each of the first to eighth unloading conveyors 61 to 68 by a sensor (not shown). Then, when it is detected by the stacker crane 4 that a work is placed on any of the load receiving conveyors, a sensor (not shown) determines whether or not there is a work on the second tracked carriage 72 side of the load receiving conveyor. Monitor constantly. When it is detected that there is no work on the second tracked carriage 72 side, the load receiving conveyor is driven to convey the work from the automatic warehouse 11/12 side toward the second tracked carriage 72 side. The work is moved to a position where it can be scooped by the track carriage 72.

The fourth program will be described.
As shown in FIG. 7 as a flowchart, when the process starts in the fourth program, it is first determined whether or not a shipment standby signal from the conveyor control panel 32 has been received (S401). When the work arrives at any of the first to eighth unloading conveyors 61 to 68 and the work moves to a position where the second tracked carriage 72 can scoop the conveyor control panel 32, that effect (Shipping standby signal) is transmitted to the management computer 34. This shipment standby signal includes information on the number of the cargo receiving conveyor (for example, “No. 2”) and the ID number of the workpiece read by the barcode reader R3 of the cargo receiving conveyor 52 (for example, “113”). ing.

  As shown in FIG. 3, the fourth program stores the presence / absence of a work on each of the first to eighth unloading conveyors 61 to 68 in the RAM 37, and if there is another work, the ID number of the work. A storage area is secured for storing. The management computer 34 that has received the shipping standby signal from the conveyor control panel 32 accesses the RAM 37, and changes the state of the unloading conveyor of the number (this time “No. 2”) included in the signal from “no work”. The work ID is rewritten to “with work” and the work ID number (“113” this time) is written (S402). If it is determined in step S401 that the shipment standby signal has not been received, the process in step S402 is not performed.

  As shown in FIG. 3, the fourth program secures a storage area in the RAM 37 for storing the ID number of the work that was transported to the shipping station 42 last time. Here, it is assumed that the work having the ID number 111 was shipped last time, and “111” is written here.

  The management computer 34 checks the ID number of the previous transported work, and then adds 1 to the ID number of the previous transported work among the work ID numbers on the unloading conveyors 61 to 68 of Nos. 1 to 8. It is checked whether there is a thing (that is, “112”) (S403). For example, when the storage content of the RAM 37 is in the state shown in FIG. 3, it can be determined that the work having the ID number 112 is placed on the first unloading conveyor 61.

  If there is a corresponding workpiece, transfer route information is created with the unloading conveyor (the first unloading conveyor 61) as the transfer source and the shipping station 42 as the transfer destination (S404), and this information is included. The transport command data is transmitted to the tracked truck control panel 31 (S405), and the system waits for a transport completion signal to be sent from the tracked truck control panel 31 (S406). If there is no workpiece that satisfies the condition in step S403, the process returns to step S401.

  When the tracked vehicle control panel 31 receives the transport command data from the management computer 34, the tracked cart control panel 31 controls the second tracked cart 72 according to the transport route information, scoops the work from the first unloading conveyor 61, and sends it to the shipping station 42. Transport. After the transportation, the tracked cart control panel 31 transmits a transportation completion signal to the management computer 34.

  Upon receipt of the transfer completion signal from the tracked cart control panel 31, the management computer 34 rewrites the state of the first unloading conveyor stored in the RAM 37 to “no work” and erases the stored contents of the ID number ( S407). Also, the ID number of the previous transport work is updated to “112” (S408).

  Thus, one transport control in the fourth program is completed. After that, it returns to step S401 again and repeats the same processing.

  In the present embodiment, the first control is performed by the first program, the second control is performed by the second program, the third control is performed by the third program, and the fourth control is performed by the fourth program. It has been realized.

Next, the features of the above control will be described.
That is, as shown in the first program (FIG. 4), when one work arrives at the arrival station 41, the management computer 34 assigns the storage unit 3 as a transfer destination of the work or the storage unit 3 A process for creating a transport route with the transport destination as the destination is not performed. Simply allocating empty consignment conveyors 51-58 (S102), creating a transport route using this as the transport destination (S103), and controlling the first tracked carriage 71 (S104).

  Then, the workpieces arrive one after another at the receiving station 41, and if the workpieces are sequentially conveyed to the empty load receiving conveyors 51 to 58 by the first tracked vehicle 71 under the control of the first program, eventually, It will be in the state where a workpiece | work arrives at both of the adjacent load receiving conveyors (a state where two workpieces can be loaded simultaneously by the stacker crane 4).

  Then, as shown in the second program (FIG. 5), the storage unit 3 is assigned (S204) only when it is detected that a total of two workpieces have arrived at the pair of cargo receiving conveyors (the unloading unit). A transport route with the part 3 as the transport destination is created (S205), and the stacker crane 4 is instructed (S206).

  As described above, in the physical distribution system according to the present embodiment, in the management computer 34, one transport path (a transport path from the arrival station 41 to the storage unit 3) straddling the cargo receiving conveyors 51 to 58 is not created. The management computer 34 creates the first track with two transport paths: a transport path from the receiving station 41 to the load receiving conveyors 51 to 58 and a transport path from the load receiving conveyors 51 to 58 to the storage unit 3. The carriage 71 and the stacker crane 4 are controlled.

  Therefore, when the work is placed on the arrival station 41, it is possible to create a transport path without considering which other work is to be combined later. Therefore, the process for creating the transport route is simplified.

  In addition, two workpieces are detected in any of the adjacent pairs of the load receiving conveyors 51 to 58 and the control for creating the conveyance path to the cargo receiving conveyors 51 to 58 on the condition that the workpiece is detected at the receiving station 41. The control for creating the transport path to the storage unit 3 on the condition can be performed independently of each other. In the physical distribution system 1 of the present embodiment, the first program and the second program operate in parallel on the management computer 34 (multitask control), and the first program is loaded from the receiving station 41 to the receiving conveyors 51 to 58. The second program is responsible only for the transport section (transport section of the stacker crane 4) from the load receiving conveyors 51 to 58 to the storage section. Each program creates a transport route in the transport section independently of each other to control the transport equipment.

  That is, it is possible to divide the conveyance section from the receiving station 41 to the storage unit 3 into two sections with the receiving conveyors 51 to 58 as a boundary, and to perform independent control for each of the divided sections. By this independent control, it is possible to avoid the problem of aggregation of the conveyance paths.

  That is, in this embodiment, in the first program, control is performed in which the work at the receiving station 41 is simply distributed and transported to the empty load receiving conveyors 51 to 58, and as a result of this control, the receiving destination conveyors 51 to 58 perform the control. The two pieces of work are only transported simultaneously to an empty storage section under the control of the second program. In this way, by sharing the control for each section, it is easy to reduce the load by transferring two workpieces conveyed by the first tracked carriage 71 one by one to the storage unit 3 by the stacker crane 4. It is realized by control.

  In addition, by making the control independent for each section, even if a failure occurs in any section, the impact of the failure on other sections can be reduced, and recovery work from the failure is easy It has become.

  Further, as shown in the third program (FIG. 6), the management computer 34 does not perform a process of creating a transport path with the shipping station 42 as the transport destination when the storage unit 3 to be delivered is specified. The empty unloading conveyors 61 to 68 are simply assigned (S303), a transport route is created using this as a transport destination (S304), and the stacker crane 4 is only controlled (S305).

  Then, as shown in the fourth program (FIG. 7), a transport route with the shipping station 42 as the transport destination is created only when the work arrives at the unloading conveyors 61-68 (S404). The tracked carriage 72 is controlled (S405).

  Thus, in the distribution system of the present embodiment, the management computer 34 does not create one transport path (a transport path from the storage unit 3 to the shipping station 42) across the unloading conveyors 61 to 68. By creating two transport paths, a transport path from the storage unit 3 to the unloading conveyors 61 to 68 and a transport path from the unloading conveyors 61 to 68 to the shipping station 42, the stacker crane 4 and the second The track carriage 72 is controlled.

  Therefore, it is not necessary to create a transfer route in consideration of the subsequent transfer of the two workpieces from the storage unit 3 by the second tracked carriage 72 one by one. As a result, the process for creating the transport path is simplified and the control load is reduced.

  In addition, control to create a transport path from the storage unit 3 to be unloaded to the unloading conveyors 61 to 68 and transport to the shipping station 42 on condition that a workpiece is detected on any of the unloading conveyors 61 to 68. Control for creating a route can be performed independently of each other. In the management computer 34, in addition to the first and second programs, the third program and the fourth program operate in parallel (multitask control), and the third program is unloaded from the storage unit 3. It takes charge of the conveyance section (conveyance section of the stacker crane 4) to the conveyors 61 to 68, and the fourth program sets the conveyance section from the unloading conveyors 61 to 68 to the shipping station 42 (conveyance section of the second tracked carriage 72). Each program creates a transport route for each transport section independently of each other and controls the transport equipment.

  That is, the conveyance section from the storage unit 3 to the shipping station 42 is divided into two sections with the unloading conveyors 61 to 68 as a boundary, and independent control can be performed for each of the divided sections. This independent control can avoid the problem of dividing the transport path.

  That is, in the present embodiment, in the third program, the work of the storage unit 3 to be unloaded is controlled to be simply distributed to the unloaded unloading conveyors 61 to 68, and as a result of this control, the unloading conveyors 61 to 61 are controlled. The workpieces that have arrived at 68 are only conveyed one by one to the shipping station 42 under the control of the fourth program. By sharing the control for each section in this way, it is possible to transfer the workpieces transported by the stacker crane 4 two by one to the shipping station 42 by the second tracked carriage 72 with a simple control with less load. It is realized by.

  In addition, by making the control independent for each section, even if a failure occurs in any section, the impact of the failure on other sections can be reduced, and recovery work from the failure is easy It has become.

  Furthermore, in this embodiment, in the second program, information for each of the two works is acquired (S202), and after the two works are transferred to the storage unit 3, Inventory information is created using the information (S208). In the third program, the stock information is used to specify the storage unit to be delivered (S302).

  Therefore, the inventory information of the automatic warehouse can be created appropriately. As a result, even when there is a restriction on the order of works to be shipped from the shipping station 42, it is possible to appropriately determine the order of delivery from the storage part of the automatic warehouse using the inventory information so as to meet the restriction. It becomes.

  Furthermore, in the second program, the acquisition of information for each of the two workpieces conveyed to the storage unit 3 is performed by reading the workpiece information with the barcode reader R2 provided in each of the cargo receiving conveyors 51 to 58. It is done by that.

  This simplifies the process for creating inventory information. Further, the independence between the control of the first program and the control of the second program is further enhanced. Therefore, it is easy to avoid that the failure that occurred in the stage just before the transfer of the workpieces to the load receiving conveyors 51 to 58 affects the transfer control from the load receiving conveyors 51 to 58 to the storage unit 3, thereby improving the failure recovery. An excellent logistics system can be provided.

  On the other hand, the information read by the barcode reader R1 of the receiving station 41 in the control of the first program is recorded in the RAM 37 and the like together with the information on which load receiving conveyors 51 to 58 the work is conveyed, and the second In the control of the program, a control configuration in which information of each work is obtained by referring to the record is also conceivable.

  In this case, the control program is slightly complicated. In addition, since the information recorded by the control of the first program is referred to by the control of the second program, the independence of each control is slightly weakened and the fault recovery is inferior. Since it is not necessary to install the barcode reader R2 on the receiving conveyors 51 to 58, the cost of the system can be reduced. This effect is particularly advantageous when the number of automatic warehouses is large and a large number of cargo receiving conveyors are installed.

  Further, instead of installing the barcode reader R2 on the cargo receiving conveyors 51 to 58, a barcode reader is installed on the stacker crane 4 so that each workpiece can be transferred during conveyance from the cargo receiving conveyors 51 to 58 to the target storage unit 3. A control configuration that reads information and creates inventory information based on this information is also possible. In this case, since the barcode reader is attached to the movable part of the stacker crane 4, it is necessary to devise such as wirelessly transmitting the information read by the barcode reader to the crane control panel 33. There is no need to install the barcode reader R2 on the cargo receiving conveyors 51 to 58, and there is an advantage that the number of barcode readers installed can be reduced. Also, with this configuration, the information recorded by the control of another program is not referred to by the control of the second program in order to acquire individual information of the work, so the independence of each control Can be high.

  In the present embodiment, a plurality of unloading conveyors 61 to 68 are provided, and each unloading conveyor 61 to 68 is provided with a barcode reader R3. Then, in the control by the fourth program, information on the workpiece detected by the unloading conveyors 61-68 is acquired (S402), and based on this information, the workpiece that has arrived in the order to be shipped has been loaded. It is checked whether it is on the exit conveyor (S403). Then, a transport path is created with the unloading conveyor on which the workpieces that have arrived placed placed as the transport source and the shipping station 42 as the transport destination (S404), and the second tracked carriage 72 is controlled (S405).

  For this reason, even when there is a restriction on the order of works to be shipped one by one from the shipping station 42, the works can be appropriately shipped according to the order.

  Further, when determining the order of the workpieces to be shipped to the shipping station 42, the workpiece information is obtained by the barcode reader R3 of the unloading conveyors 61 to 68, and the determination is made based on the information. Inventory information data is not used for order determination. As a result, in the inventory information data, information on which work is placed on the front side and what work is placed on the back side when viewed from the stacker crane 4 of the storage unit No. ○ is unnecessary.

  That is, if it is attempted to obtain information on individual workpieces using the inventory information data, the inventory information data indicates that “the number of workpieces is placed on the front side of each storage unit and the number of workpieces is placed on the back side. If there is no information indicating that “they are unloaded”, the first unloading conveyor 61 is transported to the pair of unloading conveyors 61 to 68 (for example, the first unloading conveyor 61 and the second unloading conveyor 62). It is impossible to determine what number of workpieces are conveyed to the second unloading conveyor 62 and what number of workpieces are conveyed to the second unloading conveyor 62, and it is impossible to determine the shipment order of the workpieces.

  However, in the present embodiment, when the workpieces are conveyed to the unloading conveyors 61 to 68 by the stacker crane 4, information on the number of workpieces conveyed to the unloading conveyors 61 to 68 is obtained by the barcode reader R3. Can be acquired. Accordingly, the stock information data may be information indicating that “the number of workpieces and the number of workpieces are placed in each storage unit”. This means that the inventory information data can be simplified, and the data maintenance work at the time of failure occurrence is facilitated.

  Instead of installing the barcode reader R3 on each of the unloading conveyors 61-68, a barcode reader is installed on the stacker crane 4 and is individually transferred during the conveyance from the storage unit 3 to the target unloading conveyors 61-68. You may read the information of the workpiece. In this case, in the control of the third program, based on the information read by the bar code reader, the conveyance information indicating that “the work No. ○ has been conveyed to the No. unloading conveyor” is recorded. In the fourth program, the number of workpieces placed on each unloading conveyor is acquired based on the conveyance information, and the conveyance order of the workpieces to the shipping station 42 is determined.

  In this configuration, the control is somewhat complicated and the control form in which the information created by the control of the third program is referred to by the control of the fourth program. There is no need to install the barcode reader R3 on each of the unloading conveyors 61 to 68, and there is an advantage that the number of installed barcode readers can be reduced.

  Although the embodiment of the present invention has been described above, the technical scope of the present invention is not limited to the above embodiment, and may be embodied as follows, for example.

  In addition to the management computer 34, an inventory management computer that manages inventory information of the automatic warehouses 11 and 12 may be provided. In this case, the inventory information data is not stored in the management computer 34 but is stored in the inventory management computer. The management computer 34 creates a conveyance command for each conveyance device, and sends a signal to the inventory management computer as necessary to cause the inventory management computer to create inventory information, delete the inventory information, Get information by inquiring. This configuration has an advantage that a decrease in processing capacity of the management computer can be suppressed by distributing the load between the inventory management computer and the management computer.

  The control of the present invention can be similarly applied to an automatic warehouse that can store three or more workpieces per storage unit and that includes a stacker crane that simultaneously conveys and carries the three or more workpieces. .

  ○ The work of the receiving station is transported one by one by the first tracked carriage to the stacking device provided in the receiving part of the automatic warehouse, and the work in a state where a plurality of workpieces are stacked together by the stacking device is stacked. The crane simultaneously conveys the stacked workpieces in the storage unit to the stacking unit provided in the unloading unit of the automatic warehouse, and simultaneously transports the stacked workpieces to the second tracked carriage. The above control can also be applied to a logistics system that transports the products one by one to the shipping station.

  ○ Transport between the receiving station 41 and the receiving conveyors 51 to 58 and between the unloading conveyors 61 to 68 and the shipping station 42 can be performed by an automatic guided vehicle or conveyor instead of the tracked carriages 71 and 72. It is.

  ○ An unmanned forklift can be used instead of a stacker crane. In this case, for example, it can be realized by using a pallet on which two workpieces can be placed. That is, a method may be considered in which two workpieces are placed on the pallet in the warehousing section, and the pallets are transported to the storage section and stored, and the two pallets in the storage section are transported together with the pallet to the exit section.

  The reading device that reads workpiece information is not limited to a barcode reader. For example, an OCR reader can be considered. Further, an IC chip is provided at a predetermined position of the workpiece, the ID number is recorded on the IC chip, and a scanning device (reading device) provided in the cargo receiving conveyors 51 to 58 and the unloading conveyors 61 to 68 is an IC. The structure which acquires the said ID number by performing transmission / reception of a chip | tip and an electromagnetic wave is considered.

  The first to fourth programs may be controlled not by the management computer 34 but by the control panels 31-33. That is, the first and fourth programs are controlled by the CPU of the tracked vehicle control panel 31, and the second and third programs are controlled by the CPU of the crane control panel 33. In this case, the management computer 34 exclusively creates and manages inventory information data based on the information of the control panels 31-33. In this configuration, since the load is not concentrated on the management computer 34, the processing capacity is unlikely to decrease, and there is an advantage that stable control can be realized even if arrival / shipment frequently occurs. Furthermore, the control is configured to increase independence in terms of hardware, and even if a failure occurs in a certain part of the control, it is possible to suppress the adverse effect on other controls.

  The control of the present invention can be similarly applied to a configuration in which the stacker crane 4 is configured to carry in and carry out workpieces one by one, and the track carts 71 and 72 are configured to convey two or more workpieces simultaneously.

  In the present embodiment, a case has been described in which workpieces arrive at the arrival station 41 in ascending order of ID numbers, and workpieces are shipped from the shipping station 42 in ascending order of ID numbers, but the present invention is not limited to this. For example, not only the ID number but also shipping order information can be displayed on the barcode portion of the work. In this case, not only the ID number but also the shipping order information may be stored in the inventory information data (only the shipping order information may be stored), and the shipping order information read by the barcode reader R2 in the second program. Is written in the inventory information data. In the third program, the storage unit 3 to be delivered should be specified based on the shipping order information of the inventory information data. The fourth program may be configured to determine the order of transport to the shipping station 42 based on the shipping order information read by the barcode reader R3. According to this configuration, the order of shipment can be determined regardless of the ID number.

1 is a schematic plan view showing an overall configuration of a physical distribution system according to an embodiment of the present invention. The block diagram which shows the control structure of a distribution system. The figure which shows the content of the storage area of RAM. The flowchart of a 1st program. The flowchart of a 2nd program. The flowchart of a 3rd program. The flowchart of a 4th program.

Explanation of symbols

4 Stacker crane (first transfer device)
11.12 Automatic warehouse 41 Incoming station 42 Shipping station 51-58 Conveying conveyor (warehouse)
61-68 Receiving conveyor (shipping part)
71 First tracked carriage (second transport equipment)
72 Second tracked carriage (third transfer equipment)

Claims (7)

An automatic warehouse equipped with a first transfer device for simultaneously loading and unloading x workpieces to and from a large number of storage units;
A second transfer device that connects the receiving station and the receiving part of the automatic warehouse and transfers y pieces (where y ≠ x) simultaneously;
A third transfer device that connects the unloading unit and the shipping station of the automatic warehouse and simultaneously transfers z pieces (where z ≠ x);
Management control means for giving instructions to the first to third transport devices to perform transport control;
In a logistics system comprising
The management control means includes
When y pieces of workpieces are detected at the arrival station, a transfer route having the empty storage part as a transfer destination is created and the second transfer device is instructed to transfer the y pieces of workpieces. 1 control,
When x pieces of workpieces are detected in the warehousing unit, a conveyance path is created with the empty storage unit as the transfer destination, and the first transfer device is instructed to transfer the x workpieces to the storage unit. The second control,
When a storage unit to be discharged is specified, a transfer route with the empty transfer unit as a transfer destination is created and instructed to the first transfer device, and x pieces of work in the storage unit are transferred to the output unit. The third control,
A fourth control that, when z workpieces are detected in the unloading unit, creates a transport path with the shipping station as a transport destination and instructs the third transport device to transport the z workpieces;
A logistics system characterized by In the logistics system according to claim 1,
The management control means includes
In the second control, after obtaining the individual pieces of information of the x pieces of workpieces detected by the warehousing unit, and transporting the x pieces of workpieces to the storage unit, the information is used to store inventory information of the automatic warehouse. Create
In the third control, when the storage unit to be delivered is specified, it is specified using the inventory information.
Logistics system. In the physical distribution system according to claim 2,
A reading device that reads information on each of the x workpieces is disposed in the warehousing unit, and
In the second control, the management control means acquires information on each of x pieces of workpieces in the warehousing unit by the reading device.
Logistics system. In the physical distribution system according to claim 2,
A reading device for reading workpiece information is disposed at the receiving station, and
The management control means includes
In the first control, the information on the work at the receiving station is acquired by the reading device, and the information is recorded together with the information on which warehousing part the work is transported,
In the second control, the information of each of the x pieces of work in the warehousing unit is acquired based on the record,
Logistics system. In the physical distribution system according to claim 2,
A reading device for reading workpiece information is disposed in the first transport device, and
In the second control, the management control means acquires information on each of the x workpieces by the reading device when the x workpieces detected by the warehousing unit are transported by the first transport device. It is characterized by
Logistics system. In the physical distribution system according to any one of claims 2 to 5,
x ≧ 2, and
The automatic warehouse includes a plurality of delivery units, and in this delivery unit, a reading device that reads workpiece information is disposed,
In the fourth control, the management control means obtains information on the workpiece detected by the unloading unit by the reading device,
Further, in the fourth control, it is checked on the basis of the information whether the workpieces that have arrived in the order to be shipped are based on the information, and the shipping unit to which the workpieces that have arrived belong belong to the transport source and the shipping station to the transport destination. Creating a transport route and instructing the third transport device;
Logistics system. In the physical distribution system according to any one of claims 2 to 5,
x ≧ 2, and
The automatic warehouse has a plurality of delivery sections,
A reading device for reading individual information of the work is disposed in the first transport device,
In the third control, the management control means obtains individual information of the workpiece by the reading device when the first workpiece is conveyed to the unloading unit by the first conveying device, and the information is transferred to the individual workpiece. Record it along with information on which delivery part it was transported to,
Further, in the fourth control, it is checked on the basis of the information whether the workpieces that have arrived in the order to be shipped are based on the information, and the shipping unit to which the workpieces that have arrived belong belong to the transport source and the shipping station to the transport destination. Creating a transport route and instructing the third transport device;
Logistics system.

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