JP2011108198A - Production management system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly adjust a production plan by collecting attribute information and location information of an intermediate product. <P>SOLUTION: A production management system includes: a reading and communication means for reading management information of an intermediate product at a storage location of the product, and sending it via a wireless LAN; a location detecting means for detecting a location of the reading and transmitting means by a positioning system using the wireless LAN; a storage information memory means for obtaining the storage location from the location detected, and storing the storage location in association with the management information obtained; a production status obtaining means for obtaining the progress of production in a production process; and a movement planning means, according to the progress, for extracting the intermediate product to be next submitted to the production process from the storage information memory means based on the management information, and determining the intermediate product to be moved to the next production process, a destination, and movement start time calculated inversely from the submission time. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention belongs to the technical field of production management systems in which production is managed by a computer system. In particular, the present invention relates to a production management system that collects not only management information of intermediate products that are in the process of moving between production processes but also location information such as storage locations, and optimizes a production plan based on such information.

  It is common practice to attach management slips to individual products or groups of products. The management slip usually includes ID (identification) information for identifying the product together with information such as the product attribute, such as name, date of production, production process, and the like. This ID information is also an attribute of the product. When the ID information is obtained, it is possible to obtain a lot of information related to the product that is not described in the management slip by referring to a database or the like based on the ID information (key information). In many cases, the ID information is expressed by a multi-digit alphanumeric character. Conventionally, the ID information is expressed by a bar code or a two-dimensional code so as to be machine-readable. In the case of a two-dimensional code, since the data capacity is large, not only ID information but also other attribute information is often included.

  A management system is known in which a barcode is printed on a management tag, and the barcode is read with a handy terminal to manage production (Patent Document 1). In this management system, first, a management tag on which fixed information such as the name of a workpiece and the contents of work instructions is printed is attached to the workpiece. Then, when the processing of the object to be processed is completed in each of the processing steps A to C, the tag piece is cut out and collected. And the barcode of each tag piece is scanned with a handy terminal, and the information of a to-be-processed object is read. The read information is transmitted to the server and aggregated. This makes it possible to quickly and accurately grasp the processing status of the object to be processed and the progress status in each processing process.

  Recently, RFID (radio frequency identification) is also widely used in specific fields. The RFID system includes an RF tag that stores ID information and other attribute information, and an RF reader that reads the information from the RF tag. RFID, as its name suggests, is "solid identification by radio waves" and differs depending on the system (electromagnetic induction, radio wave, frequency band, etc.), but the RF tag attached to the product and the RF reader are a distance of several centimeters to several meters. It is possible to send and receive information by wireless communication. Inventions that apply this RFID system to inventory management, distribution management, and the like are known. For example, RF tags are attached to a plurality of items for rent, and a plurality of antennas, one for each storage position for storing them, are sequentially switched and connected to an RF reader, and are in storage positions corresponding to the antennas. There is a known rental article management system that detects and manages a storage position and information relating to an article from information relating to an article obtained by reading an RF tag with an RF reader (Patent Document 2). Also, a product flow control device is known in which a RF factory having a readable / writable memory is attached to a printed product transport pallet in a printing factory that processes sheet paper, and distribution data and processed data are read and written by an RF reader / writer. (Patent Document 3).

  In the management system (Patent Document 1) that scans the bar code using the handy terminal, the attribute information of the intermediate product can be read, but the position information of the intermediate product cannot be read. However, in the systems (Patent Documents 2 and 3) applied to inventory management, distribution management, etc., to which this RFID system is applied, position information can also be acquired.

JP 2001-315920 A Utility Model Registration No. 3108832 JP2008-155643

However, in the case of a system that acquires position information using this RF tag, there is a restriction that the communication distance is about several meters at the maximum (for example, 5 m). For this reason, there is no problem when an antenna is installed in a warehouse or a specific passage, but there is a problem that a product storage location cannot be grasped in a wide space (for example, 50 m × 50 m) such as a factory. Further, when the layout of the storage location is frequently updated, there is a problem that system maintenance management becomes extremely complicated. This makes it difficult to apply when managing intermediate products in products with short delivery times that are difficult to store in specific locations such as warehouses and shelves. Even if an advanced production management system is used, the production procedure is true. It is a cause that cannot be optimized.
On the other hand, GPS (Global Positioning System) is often used to acquire position information in a wide space, but this is not available indoors, particularly for buildings having a hierarchical structure.

  The present invention has been made to solve the above problems. The purpose is to collect not only the attribute information of intermediate products that are in the process of moving between production processes, but also the location information such as storage locations in a large space such as in a factory, and to optimize the production plan based on such information To provide a management system.

The production management system according to claim 1 of the present invention reads the management information of the product at the storage position and transmits the management information through the wireless LAN when storing the intermediate product in production that moves between the production processes. Reading communication means, position detection means for detecting the position of the reading communication means by a positioning method using a wireless LAN, obtaining a storage position from the detected position, and storing the storage position and the acquired management information A storage information storage means for linking and storing; a production status acquisition means for acquiring a production progress status in the production process; and the intermediate information to be next introduced into the production process based on the acquired progress status. An intermediate product that is extracted from the storage information storage means based on the information and moved to the next production process, and a movement planning means that determines a movement destination. In which was to so that.
The production management system according to claim 2 of the present invention is the production management system according to claim 1, wherein the movement planning means starts moving backward from the time at which an intermediate product to be input next in the production process is to be input. The time is determined.
The production management system according to claim 3 of the present invention is the production management system according to claim 1 or 2, wherein the movement planning means moves the extracted intermediate product from its storage position to the next production process. The path and the required time are calculated, and the determination is made so that the required time is minimized.
The production management system according to claim 4 of the present invention is the production management system according to any one of claims 1 to 3, wherein the movement planning means transfers the extracted intermediate product from its storage position to the next production process. The moving path to travel and the required time are calculated, and the determination is made so that the moving path is minimized.
Further, the production management system according to claim 5 of the present invention is the production management system according to any one of claims 1 to 4, wherein the movement planning means includes an intermediate product in the same floor as the movement destination in the movement path. If there is, it is given priority.
According to a sixth aspect of the present invention, in the production management system according to any one of the second to fifth aspects, at least the intermediate product is specified from the information related to the determination made by the movement planning means. A display means for displaying information, a storage position, and a movement start time on a display monitor provided in the production process of the movement destination is provided.

  According to the production management system of the present invention, not only the management information of intermediate products in the process of moving between production processes, but also the location information such as the storage location in a wide space such as a factory is collected, and production is performed based on the information. A production management system that optimizes the plan is provided.

It is explanatory drawing which shows a simple example of operation | movement in the production management system of this invention. It is explanatory drawing which shows an example of a structure in the production management system of this invention. It is a block diagram which shows an example of a structure in the production management system of this invention. It is a flowchart which shows the process of the operation | movement which acquires and preserve | saves the positional information on a wireless scanner in the production management system of this invention. It is a flowchart which shows the process of the operation | movement which reads a management tag in the production management system of this invention, acquires management information, and preserve | saves it. It is a flowchart which shows the process of the operation | movement which acquires management information and position information, produces | generates storage information, and preserve | saves in the production management system of this invention. It is a flowchart which shows the process of the operation | movement which produces | generates a production plan based on storage information and the progress of production in the production management system of this invention.

Next, embodiments of the present invention will be described with reference to the drawings. A simple example of the operation in the production management system of the present invention will be described first. This description facilitates understanding of the overall configuration and operation of the present invention. A simple example of the operation is shown in FIG. 1 as an explanatory diagram. In the example shown in FIG. 1, the product 1 is manufactured in the previous process A. This product 1 is an intermediate product that is put into the post-process C and processed. In the post-process C, the product 0 is manufactured from the input product 1. Moreover, the production line D of the previous process A exists on the 2nd floor of the factory (building). In the post-process C, there are two production lines, a production line E and a production line F. The production line E exists on the second floor of the factory, and the production line F exists on the first floor of the factory. The time required to move the product 1 from the production line D to the production line E is 5 minutes, and the time required to move the product 1 from the production line D to the production line F is 20 minutes. There is a difference in the required time.
In the present invention, the two terms “production” and “manufacturing” are used, but they have the same meaning and are not different.

The production management system acquires the progress of production in each process. As shown in the upper part of the arrow (after 10 minutes) in FIG. 1, at 12:10, the production line D is operating normally in the previous process A, and the production line in the subsequent process C. Two production lines, E and production line F, are operating normally. In addition, for the product 1 being manufactured on the manufacturing line D, the production of a series (subdivided lot) of the previous input is scheduled to be completed within 10 minutes. With respect to the product 0 being manufactured on the production line E, the processing of the series of products 1 introduced last time is scheduled to end at 12:20. With respect to the product 0 being manufactured on the manufacturing line F, the processing of the series of products 1 that was previously input is scheduled to end at 12:10.
At this time, the production management system makes a production plan for the destination of the product 1 when the series of products 1 being manufactured on the manufacturing line D is finished. The production management system determines the movement destination of the product 1 as the production line E (provisional decision) because the movement time is as short as 5 minutes and can be continued without interruption.

Thereafter, the production management system acquires the progress of production in each process. As shown in the lower part of the arrow (after 10 minutes) in FIG. 1, at the time of 12:20 when 10 minutes have elapsed, the production line D is operating normally in the previous process A. . In the post-process C, a failure occurs in the production line E, and the production line E is in a stopped state. On the other hand, the production line F is operating normally. In addition, for the product 1 being manufactured in the manufacturing line D, the manufacturing for the previous input is completed. Since a failure has occurred in the product 0 being manufactured in the manufacturing line E, the processing of the previously introduced product 1 is scheduled to be finished at 13:00. For the product 0 being manufactured in the manufacturing line F, the processing of the product 1 that was introduced last time has been completed as scheduled.
At this time, the production management system makes a production plan for the destination of the product 1 that has been discontinued in the production line D. The production management system determines the movement destination of the product 1 as the production line F because the time required for the movement is as long as 20 minutes but the time for suspending the production can be shortened.
As described above, in the production management system of the present invention, an appropriate movement plan for intermediate products is established based on information such as progress in the upstream production line, progress in the downstream production line, and product storage position. It is done.

In the foregoing, a simple example of the operation in the production management system of the present invention has been described. Next, a configuration in the production management system of the present invention for executing the operation described above will be described. An example of the configuration is shown in FIG. 2 as an explanatory diagram. An example of the configuration is shown in FIG. 3 as a block diagram. FIG. 3 shows an example as a more specific configuration with respect to FIG. 2 shown as an explanatory diagram. In FIG. 3, a part 100 surrounded by a broken line is a production management system, and the part outside the broken line shows process management PCs 200a and 200b and display means (display monitors) 201a and 201b provided on the production line. . The production management system 100 and the process management PCs 200 a and 200 b are connected by a LAN (local area network) 300.
In the production management system 100 shown in FIGS. 2 and 3, reference numeral 110 denotes a main body (production management unit), 111 denotes a storage information database (storage information DB), 112 denotes storage information storage means, 113 denotes production status acquisition means, and 114 denotes movement. Planning means 115, display means, 120, 120a, 120b position detection means (position information acquisition unit), 121, 121a, 121b are position information databases (position information DB), 130, 130a, 130b are wireless LAN bridges (wireless (LAN base station: wireless antenna) 131, 131a, 131b are wireless scanners.

The production management unit (main body) 110 can be configured by software and hardware of a data processing device such as a personal computer. The production management unit (main body) 110 performs processing for associating product management information collected in the production process with the product storage position and storing it in the storage information DB (database) 111 as storage information. This storing process is performed by the storage information storage unit 112 of the production management unit (main body) 110. Product management information is read by the wireless scanner (handy terminal) 131, 131a, 131b on the code printed directly on the product or the code (bar code, two-dimensional code, etc.) printed on the management tag attached to the product. It is the information obtained by. The product storage position is information obtained by the position information acquisition units (position detection means) 120, 120a, 120b of the positioning method using the wireless LAN detecting the positions of the wireless scanners 131, 131a, 131b.
In FIG. 3, the subscripts a and b indicate that the range (floor) in which the position information acquisition unit (position detection means) functions is different. The plurality of wireless scanners indicates that a plurality of wireless scanners may exist on the same floor.

In addition, the production management unit (main body) 110 performs a process for making a production plan such as a process for determining a destination of the product from the storage information and the manufacturing progress.
The production status acquisition unit 113 acquires the manufacturing progress status. The manufacturing progress can generally be obtained through LAN 300 from process management PCs (personal computers) 200a and 200b provided in the manufacturing line. Each product is assigned a serial number for management in the manufacturing process. The serial number can be automatically read on the production line, and the progress of manufacturing can be obtained by the serial number read automatically. When the management information of the product is expressed by a two-dimensional code, the serial number is often included in the management information. In this case, the manufacturing progress can be obtained from the management information read by the wireless scanner. Of course, an operator of the manufacturing line can also input the progress of manufacturing manually from the wireless scanner 131 or the process management PCs 200a and 200b.
The movement planning means 114 performs a process of determining a product movement destination in the above production plan.
The display means 115 performs a process of displaying a production plan or the like on a process management PC provided on the production line.
The storage information DB 111 is a database that stores storage information obtained by associating management information and storage positions in the production management unit 110. The storage information storage unit 112 performs processing for storing the storage information.

A position information acquisition unit (position detection means) 120 detects the position of the wireless scanner 131 by a positioning method using a wireless LAN. While positioning by GPS is widely used outdoors, positioning systems using a wireless LAN are known indoors. There are two typical methods for positioning using a wireless LAN.
The first method detects the received electric field strength when the radio terminal (wireless scanner 131) receives radio waves from the wireless terminal (wireless scanner 131), and calculates the position from the received electric field strength. It is a method. For example, a plurality of wireless antennas 130 are installed indoors, the distance between the wireless scanner 131 and the wireless antenna 130 is estimated from the received electric field strength, and the position is calculated according to the principle of triangulation. Because there is an influence of the reflected radio wave from the wall in the room, correction is performed by empirical data or learning.
The second method is a method for detecting a time difference when a radio terminal (wireless scanner 131) receives radio waves from a plurality of wireless LAN base stations (wireless antenna 130: base unit) and calculating a position from the time difference. is there. For example, a plurality of wireless antennas 130 are installed indoors, the distance between the wireless scanner 131 and the wireless antenna 130 is calculated from the time difference, and the position is calculated according to the principle of triangulation. There is a need for highly accurate time synchronization between each of the wireless LAN base stations (0.3 m for 10 ⁻⁹ seconds (corresponding to 1 GHz)).
The position information DB 121 is a database that stores the position information detected by the position information acquisition unit 120.

The wireless scanner 131 scans the code printed on the management tag when a worker on the production line manually places the reading unit of the wireless scanner 131 on the management tag. The wireless scanner 131 transmits the scanning data obtained by the scanning to the wireless antenna 130 by wireless communication. The scan data includes ID information for specifying a product and other product attribute information as management information.
The wireless antenna 130 receives scanning data transmitted from the wireless scanner 131 and acquires position information of the wireless scanner 131 in a factory (floor) where the product is manufactured. Although one wireless antenna 130 is shown in FIG. 2, it can be provided at a plurality of locations in the factory as required. In addition, a wireless antenna that receives scanning data and a wireless antenna that acquires position information can be made separate. The wireless antenna 130 shown in FIG. 2 is shown as wireless LAN bridges 130a and 130b in FIG. The wireless LAN bridges 130 a and 130 b are wireless LAN base stations having a (bridge) function for bridging received scanning data to the (wired) LAN 300.

The process management PC 200a is a personal computer that is provided in the production line and collects the operation status of the production line, downloads the production plan generated by the production management unit (main body) 110, and inputs work records by the operator.
A display monitor 201 is a display monitor of a process management PC (personal computer) provided in the production line. The display monitor 201 displays information for specifying, for example, an intermediate product, a storage position, and a movement start time from information related to the movement plan established by the production management system. The worker on the production line determines the working method by looking at the display on the display monitor 201.

The configuration has been described above. Next, the operation in the production management system of the present invention will be described. Each of position information acquisition, attribute information acquisition, storage information generation, and movement plan generation will be described in that order.
(Acquisition of location information)
First, the operation for acquiring and storing the position information of the wireless scanner in the production management system of the present invention will be described. The process of the operation is shown in FIG. 4 as a flowchart. Here, an embodiment of the present invention based on the second method among the above-described positioning methods using the wireless LAN will be described.
First, in step S101 (polling), the wireless LAN bridge (wireless LAN base station) 130a performs polling processing on the wireless scanner 131a. The polling process is a processing method that periodically inquires a plurality of communication devices (wireless scanners) in order in order to perform status determination and synchronization processing in transmission and reception, and executes transmission and reception processing when a predetermined condition is satisfied. That is. For this purpose, information for identifying the wireless scanner 131a to be periodically inquired, such as a MAC address (Media Access Control address), is registered in advance in the wireless LAN bridge 130a.
Next, in step S102 (wireless scanner response), the wireless scanner 131a transmits a response to the polling process.

Next, in step S103 (reception time information generation), the wireless LAN bridge 130a receives the response of the wireless scanner 131a and refers to the clock to obtain the reception time. Reception time information including the reception time, information specifying the wireless scanner, and information specifying the wireless LAN bridge is generated and temporarily stored. The processing after receiving the response of the wireless scanner 131a is performed in the same manner in the wireless LAN bridge 130a. The same clock that is strictly adjusted is supplied to the plurality of wireless LAN bridges 130a. Therefore, the reception time information generated and temporarily stored in a plurality of wireless LAN bridges 130a is information that can compare the posterior (time difference) of the reception time with each other.
Next, in step S104 (reception time information transmission), the wireless LAN bridge 130a transmits the temporarily stored reception time information to the position detection unit 120a through the LAN 300. This transmission is performed from a plurality of wireless LAN bridges 130a.

Next, in step S105 (reception time information reception), the position detection unit 120a receives a plurality of reception time information transmitted by a plurality of existing wireless LAN bridges 130a.
Next, in step S106 (position information generation), the position detector 120a generates position information of the wireless scanner 131a based on the reception time at which the information specifying the wireless scanner matches the received reception time information. In general, there is a time difference between a plurality of reception times generated by a plurality of existing wireless LAN bridges. Since the installation positions of the plurality of wireless LAN bridges 130a are fixed, there are time differences between the reception times due to the difference in the distance between the position and the position of the wireless scanner 131a. Conversely, the difference in distance from the position of the wireless scanner 131a to the installation position of the plurality of wireless LAN bridges 130a is calculated from the time difference at a plurality of reception times. If wireless LAN bridges 130a are installed at least at three locations, the position of the wireless scanner 131a can be calculated based on the principle of triangulation. When more than three places are installed, the position can be calculated with higher accuracy. The position detection unit 120a generates position information by associating the calculated position, the reception time, and information specifying the wireless scanner. The reception time when linking is not required to be as high as the reception time when calculating the position (for example, 10 ⁻⁹ seconds), and accuracy of 1 second is sufficient.
Next, in step S107 (position information storage), the position detector 120a stores the generated position information in the position information database 121a.

(Management information acquisition)
Subsequently, an operation of reading the management tag to acquire and store the management information in the production management system of the present invention will be described. The process of the operation is shown in FIG. 5 as a flowchart.
First, in step S201 (management tag scanning) in FIG. 5, the worker holds the wireless scanner 131a over the management tag attached to the product at the product storage position. The wireless scanner 131a scans a code (bar code, two-dimensional code, etc.) printed on the management tag and reads management information of the product. The wireless scanner 131a adds information for specifying the wireless scanner and the time when the management information is read to the management information. Accordingly, the management information includes ID information for identifying the product and other attribute information of the product, as well as information for identifying the read wireless scanner, and the time of reading.

Next, in step S202 (wireless LAN transmission), the wireless scanner 131a transmits the management information to the wireless LAN bridge 130a through the wireless LAN.
Next, in step S203 (wireless / wired conversion), the wireless LAN bridge 130a management information is received and bridged to the (wired) LAN 300.
Next, in step S204 (management information reception), the production management system body 110 receives management information from the wireless scanner 131a through the LAN 300.
Next, in step S205 (management information storage), the production management system main body 110 stores the received management information in a memory such as a main memory or a hard disk. In step S201, the time at which the wireless scanner 131a read the management information is added to the management information. However, in step S205, the time of the clock built in the data processing apparatus may be added.

(Storage information generation)
Next, an operation of generating management information and storing information by acquiring management information and position information in the production management system of the present invention will be described. The process of the operation is shown in FIG. 6 as a flowchart.
First, in step S301 (management information input), the storage information storage means 112 of the production management system main body 110 inputs the management information received by the production management system main body 110 from the storage destination memory.
Next, in step S302 (refer to the position information database), the storage management information storage unit 112 is stored in the position information database 121a using the information specifying the wireless scanner added to the management information and the time as key information. Refer to the location information.
Next, in step S303 (extraction of position information), the storage management information storage unit 112 is position information associated with a time close to the time added to the received management information, and is a wireless scanner added to the management information. The position information associated with the information for identifying is extracted.
Next, in step S304 (management information / position information storage), the storage management information storage unit 112 associates the management information with the extracted position information to form storage information, which is stored in the storage information database 111.

(Movement plan generation)
Next, an operation of generating a production plan based on storage information and production progress in the production management system of the present invention will be described. The process of the operation is shown in FIG. 7 as a flowchart.
First, in step S401 (production status acquisition) in FIG. 7, the production status acquisition unit 113 acquires the manufacturing progress status. For example, the progress of manufacturing is obtained through LAN 300 from process management PCs (personal computers) 200a and 200b provided in the manufacturing line. The progress status of the manufacturing process includes the expected remaining end time of a series of intermediate products input to the production line, the predicted end time of manufacturing of a series of intermediate products in the manufacturing line that manufactures the intermediate product, and the like.
Next, in step S402 (target intermediate product selection), the movement planning means 114 is a manufacturing in which the remaining input end time of the intermediate product input based on the manufacturing progress status is approaching and the movement plan is not fixed. A line is identified, a move plan for the production line is prioritized, and an intermediate product to be input to the production line is selected as an intermediate product for which a move plan is drawn up.

Next, in step S403 (acquisition of storage information), the movement planning unit 114 refers to the storage information database 111 for the selected intermediate product, and acquires all the storage information of the intermediate product.
Next, in step S404 (moving route / required time calculation), the required travel route calculation and movement are required for all combinations based on all the production lines to which the intermediate product should be introduced and the acquired storage information. Calculate time. Here, all of the production lines include production lines that have already been planned for movement. By doing so, it is possible to make a movement plan that is optimized in accordance with changes in the storage status of intermediate products over time and changes in the operating status of the production line.

Next, in step S405 (movement destination determination), the movement planning means 114 makes a movement plan under a predetermined condition. For example, on the condition that the time required to move from the storage position to the next production process is minimized, the production line of each intermediate product is determined. It can also be made a condition that the moving path is minimized. In addition, if there is an intermediate product in the same floor as the movement destination in the movement path, it can be added on condition that priority is given to it. In addition, when a considerable time is available until the start of production in the next production process, and the waiting time until the calculated movement start time is longer (than the corresponding set time), the movement planning unit 114 temporarily A movement plan is made with a predetermined storage location (warehouse) that is not a secure storage location as the destination. When the movement destination is determined in this way, the movement planning means 114 performs a reverse calculation from the information for specifying the intermediate product, the information for specifying the production line of the movement destination, the movement route, the required time, and the time to be input to the production line. The movement start time and the like are stored as movement plan information in a movement plan database (not shown) of the production management system.
Next, in step S406 (display data transmission), the display unit 115 moves at least the information specifying the intermediate product, the storage position, and the movement start time from the information related to the movement destination determination performed by the movement planning unit 114. It is displayed on a display monitor provided in the previous production line.

As described above, according to the production management system of the present invention, not only the management information of intermediate products in production that move between production processes, but also the location information such as storage locations in a wide space such as in a factory, The production plan can be optimized based on the information.
In addition, since the movement start time calculated backward from the time at which the intermediate product to be input next in the production process is to be calculated is determined, by what time an operator who transports the intermediate product, such as a worker on the production line, does the transfer. It will be clear if it should start. As a result, the intermediate product to be input does not end and the production line is not stopped, and the maximum operating rate of the production line can be achieved. In addition, when the waiting time until the movement start time is long, a predetermined storage location (warehouse) can be set as the movement destination.
In addition, since the movement plan is determined so that the required time for moving the extracted intermediate product from the storage position to the next production process is minimized, the time loss in the production process can be minimized.
In addition, since the movement plan is determined so that the movement path for moving the extracted intermediate product from its storage position to the next production process is minimized, energy loss due to the transfer of the intermediate product and the occurrence of congestion in the distribution channel Can be minimized.
In addition, if there is an intermediate product in the same path as the destination in the movement path, the movement plan is determined so that it is given priority, so not only the loss of time, energy, etc. is minimized, but also the waiting time is reduced. Uncertain factors such as the use of a clear elevator can be eliminated, and the plan can be executed reliably.
In addition, since the information specifying the intermediate product, the storage position, and the movement start time are displayed on the display monitor provided in the production process at the destination, at least the information related to the movement plan is displayed. The response can be performed in real time.

  The production management system according to the present invention provides an appropriate transfer plan for intermediate products in response to changes in manufacturing conditions in a factory where intermediate products delivered between processes are stored in unspecified locations. It can be suitably used when trying to stand up in real time.

200a, 200b Process management PC
201a, 201b Display means (display monitor)
100 Production management system 300 LAN (local area network)
110 Body (Production Management Department)
111 Storage Information Database (Storage Information DB)
112 storage information storage means 113 production status acquisition means 114 movement planning means 115 display means 120, 120a, 120b position detection means (position information acquisition unit)
121, 121a, 121b Position information database (position information DB)
130, 130a, 130b Wireless LAN bridge (wireless LAN base station: wireless antenna) 131, 131a, 131b Wireless scanner

Claims (6)

Reading communication means for reading management information of a product at a storage position and transmitting the management information through a wireless LAN when storing an intermediate product in production that moves between production processes;
Position detecting means for detecting the position of the reading communication means by a positioning method using a wireless LAN;
A storage information storage means for acquiring a storage position from the detected position and storing the storage position and the acquired management information in association with each other;
Production status acquisition means for acquiring production progress in the production process;
Based on the acquired progress, the intermediate product to be next input into the production process is extracted from the storage information storage means based on the management information, and the intermediate product to be moved to the next production process and the destination are determined. Movement planning means to
A production management system comprising: 2. The production management system according to claim 1, wherein the movement planning means determines a movement start time calculated backward from a time at which an intermediate product to be input next in the production process is to be input. 3. The production management system according to claim 1 or 2, wherein the movement planning means calculates a movement route and a required time for moving the extracted intermediate product from the storage position to the next production process, and the required time is minimized. The production management system characterized in that the determination is performed as follows. The production management system according to any one of claims 1 to 3, wherein the movement planning means calculates a movement path and a required time for moving the extracted intermediate product from the storage position to the next production process, and the movement path. The production management system is characterized in that the determination is made so as to minimize. The production management system according to any one of claims 1 to 3, wherein the movement planning means gives priority to an intermediate product in the same floor as the movement destination in the movement path. . The production management system according to any one of claims 2 to 4, wherein at least information that specifies an intermediate product, storage position, and movement start time among information relating to the determination made by the movement planning unit is stored in the destination. A production management system comprising display means for displaying on a display monitor provided in a production process.

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