WO2023218837A1

WO2023218837A1 - Restoration priority order identification device, restoration priority order identification system, restoration priority order identification method, and program

Info

Publication number: WO2023218837A1
Application number: PCT/JP2023/014779
Authority: WO
Inventors: 勇真石河
Original assignee: 三菱電機株式会社
Priority date: 2022-05-11
Filing date: 2023-04-11
Publication date: 2023-11-16
Also published as: JPWO2023218837A1

Abstract

In the event that facilities (21 to 23) have halted, the restoration priority order identification device (1) specifies a priority order in which the halted facilities are to be restored. The restoration priority order identification device (1): acquires operation-related information, which includes facility state information indicating states and causes of the halt of the facilities (21 to 23), and process-related information; calculates buffer quantities of respective conveyance devices on the basis of the acquired information; and calculates a representative value of restoration time. The restoration priority order identification device (1): calculates allowance time for the buffer quantities to reach a predetermined upper-limit quantity on the basis of the buffer quantities and takt times of the facilities; and calculates degree-of-restoration priority evaluation values indicating recovery priorities on the basis of the representative value of restoration time and the allowance time.

Description

Recovery priority identification device, recovery priority identification system, recovery priority identification method and program

The present disclosure relates to a recovery priority identification device, a recovery priority identification system, a recovery priority identification method, and a program.

A technique is known that determines the priority of equipment recovery when trouble occurs in equipment on a production line. For example, Patent Document 1 discloses a production line management device that calculates the priority of equipment recovery when trouble occurs in multiple equipment from the number of buffers of each equipment and the distance between stopped equipment and bottleneck equipment. There is. Furthermore, Patent Document 2 estimates the production capacity of each piece of equipment at the time of trouble resolution based on the production results and trouble time of each piece of equipment, focuses on the cause of the trouble for which the estimated production capacity is highest, and prioritizes improvements. A performance analyzer is disclosed.

Japanese Patent Application Publication No. 2006-146876 Japanese Patent Application Publication No. 2007-25997

When determining the priority for equipment restoration, the restoration time may vary depending on the cause of the outage. The technique disclosed in Patent Document 1 does not take into account the recovery time depending on the cause of the stoppage, so there is a problem in that the recovery order cannot be appropriately specified.

Additionally, if a problem occurs, buffer clogging may occur near the equipment where the problem occurred. Since the technique of Patent Document 2 is an analysis method that does not take into account the number of buffers, there is a problem in that it does not prioritize improvements that take into account the decline in production performance due to clogging of buffers near troubled equipment. .

The present disclosure has been made in view of the above problems, and aims to enable more appropriate identification of the recovery order.

In order to achieve the above object, the recovery priority identification device according to the present disclosure includes a plurality of facilities that perform processing on a processing target, and a connection between the facilities, so that one facility performs processing on another facility. A recovery priority order identification device that identifies the priority order of restoration of the stopped equipment when a plurality of equipment in a production line equipped with a transport device for transporting objects is stopped, the equipment comprising: an information acquisition means, a buffer quantity calculation means; , a recovery time calculation means, a margin time calculation means, an evaluation value calculation means, and a recovery priority order identification means. The information acquisition means acquires information related to operation including a stop factor that is a cause of the stoppage of the plurality of facilities and equipment status information indicating the status of each facility, and information related to the processes of the plurality of facilities. The buffer quantity calculation means calculates the buffer quantity of each transport device based on the information acquired by the information acquisition means. The recovery time calculation means calculates a representative value of the recovery time from stoppage to recovery for each cause of stoppage of the plurality of equipment based on the information acquired by the information acquisition means. The margin time calculation means indicates the time until the buffer quantity of the conveyance device reaches a predetermined upper limit quantity based on the buffer quantity calculated by the buffer quantity calculation means and the predetermined takt time of each piece of equipment. Find free time. The evaluation value calculation means calculates a recovery degree priority evaluation value indicating the priority of recovery based on the representative value of the recovery time calculated by the recovery time calculation means and the margin time calculated by the margin time calculation means. The recovery priority order specifying means uses the recovery degree priority evaluation value obtained by the evaluation value calculation means to specify the recovery priority order of the stopped equipment.

According to the present disclosure, the recovery priority is evaluated based on the representative value of the recovery time for each cause of the stoppage and the margin time taking into account the buffer quantity, and the recovery priority of the stopped equipment is specified, so the production line It is possible to more appropriately identify the recovery sequence that suppresses the decline in production capacity.

A block diagram showing a configuration example of a production system according to an embodiment of the present disclosure A diagram showing an example of a recovery time information table stored in the first storage unit of the recovery priority identification device according to the embodiment of the present disclosure. A diagram showing an example of a serial number table stored in the first storage unit of the recovery priority order identification device according to the embodiment of the present disclosure. A diagram illustrating an example of an equipment status table stored in the first storage unit of the recovery priority identification device according to the embodiment of the present disclosure. A diagram showing an example of a recovery priority order table stored in the third storage unit of the display device according to the embodiment of the present disclosure. A diagram illustrating an example of a hardware configuration of a recovery priority identification device according to an embodiment of the present disclosure. Flowchart illustrating an example of operation of recovery priority order identification processing according to an embodiment of the present disclosure A diagram for explaining the number of buffers of the transport device calculated by the buffer number calculation unit of the recovery priority order identification device according to the embodiment of the present disclosure. Diagram for explaining the average recovery time calculated by the average recovery time calculation unit of the recovery priority identification device according to the embodiment of the present disclosure Diagram for explaining the margin time calculated by the margin time calculation unit of the recovery priority order identification device according to the embodiment of the present disclosure Flowchart illustrating an example of operation of display processing according to an embodiment of the present disclosure Flowchart illustrating an example of the operation of the modified data sending process according to the embodiment of the present disclosure

(Embodiment)
A recovery priority identification device according to an embodiment of the present disclosure will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a production system 100 including a recovery priority identification device 1 according to an embodiment of the present disclosure.

The production system 100 includes a production line composed of A equipment 21, B equipment 22, and C equipment 23 that perform predetermined processing on input workpieces, and a production line that is arranged in A equipment 21, B equipment 22, and C equipment 23, respectively. Operation detectors 21a, 22b, and 23c installed, a recovery priority order identification device 1 that identifies the priority order in which recovery work is performed for stopped equipment, and information management that manages operation information and manufacturing information of each equipment. It includes a device 6 and a display device 80 that displays recovery priorities. Furthermore, the recovery priority order identification device 1, the information management device 6, and the display device 80 are each configured with, for example, a personal computer.

The A facility 21, the B facility 22, and the C facility 23 each include a PLC (programmable logic controller) a31, a PLC b32, and a PLC c33 that perform sequence control of the facilities. Furthermore, the A equipment 21 and the B equipment 22 are connected by a transport device 41, and the B equipment 22 and C equipment 23 are connected by a transport device 42, and the work discharged from each equipment is carried by the transport device to the next equipment. Injected. In the present embodiment, the workpiece discharged from the A equipment 21 is transported by the transport device 41 and processed by the B equipment 22. The work discharged from the B facility 22 is carried by a conveyance device 42 and processed by the C facility 23. The production line of the production system 100 of this embodiment is not designed with pitch feeding in which the cycle times of each piece of equipment are completely synchronized, but with a configuration having at least one buffer at the input stage.

A buffer is a holding device that allows work to be accepted and taken out asynchronously and independently. Due to the presence of the buffer, for a certain period of time, for example, there will be no stoppage due to the stoppage of the equipment after the buffer and the waiting for payout of the equipment before the buffer.

The operation detectors 21a, 22b, and 23c detect the operating states of the corresponding A equipment 21, B equipment 22, and C equipment 23, respectively. The operation detectors 21a, 22b, and 23c output operation information indicating the operating status of each piece of equipment and manufacturing information indicating the manufacturing status of each piece of equipment to each PLC at predetermined time intervals. The operation detectors 21a, 22b, and 23c count the number of workpieces worked on by the equipment, detect execution and stoppage of work, and detect the cause of the stoppage. The operation detectors 21a, 22b, and 23c output, at predetermined time intervals, manufacturing information indicating the number of workpieces worked on at that time (for example, the number of processed workpieces). In addition, the operation detectors 21a, 22b, and 23c output operation information indicating the stop time, recovery time, abnormality occurrence time, etc. for each stop factor that caused the work to stop at a predetermined time. . Note that the operating information and manufacturing information include any type of information indicating the operating status and manufacturing status of the A facility 21, the B facility 22, and the C facility 23.

The PLCa 31, b 32, and c 33 transmit the operation information and manufacturing information output by each facility to the information management device 6.

In the example of FIG. 1, the production system 100 includes three facilities, but the number of facilities is arbitrary.

The recovery priority identification device 1 includes an information acquisition unit 11 that acquires operation information and manufacturing information from the information management device 6, a buffer number calculation unit 12 that calculates the number of buffers accumulated in the

transport devices

41 and 42, and an average recovery An average recovery time calculation unit 13 that calculates the time, a margin time calculation unit 14 that calculates the margin time that indicates the time until the equipment stops due to buffer clogging, and an evaluation value that calculates the recovery priority evaluation value that indicates the priority of recovery. a calculation unit 15, a priority order identification unit 16 that identifies priorities, a determination unit 17 that determines whether there is a change in the stop state of stopped equipment, a display management unit 18 that sends corrected data, and a recovery A first storage unit 19 is provided that stores various data, tables, and calculated values necessary for specifying priorities.

The first storage unit 19 stores information necessary for specifying recovery priorities. The first storage unit 19 includes a recovery time information table 191 that stores recovery time, etc., a serial number table 192 that stores the final serial number of processed workpieces, an equipment status table 193 that stores equipment status information, and a recovery priority level. A calculated value 194 calculated in the specific device 1, takt time data 195 indicating the time required to process one workpiece in each facility, and upper limit buffer number data 196 indicating the upper limit number of buffers are stored.

As illustrated in FIG. 2, the recovery time information table 191 is a table that associates equipment identification information, "stoppage factor", "recovery time", and "abnormality occurrence time". The "stop factor" is a factor that caused the equipment to stop, for example, out of parts. Note that the cause of the stoppage is not limited to a shortage of parts, but may also be a clogging of a workpiece. The stall factor may be any type of stall factor. "Restoration time" is the time from the time the equipment stopped until the equipment is restored. The "abnormality occurrence time" is the time when the abnormality occurred, in other words, the time when the cause of the stoppage occurred. The recovery time information table 191 is a table that lists ongoing data including accumulated past data.

As illustrated in FIG. 3, the serial number table 192 is a table that associates equipment identification information with a "final serial number." "Last serial number" means the number of workpieces worked on in each piece of equipment. For example, the "last serial number" indicates the number of processed workpieces. The number of buffers in the transport device between the two pieces of equipment is specified by the number of differences in final serial numbers between the equipment in the previous process and the equipment in the post process. "Number of buffers" means the number of works waiting in the buffer of each facility. Specifically, it is the number of works that are waiting to be processed in the buffer. In this embodiment, when the final serial number of the A equipment 21 which is the front process is 5 and the final serial number of the B equipment 22 which is the downstream process is 3, the number of buffers in the transport device 41 is two.

As illustrated in FIG. 4, the equipment status table 193 is a table in which status information for each piece of equipment identification information is shown in chronological order. For example, in the case of equipment A, "MA1" is information indicating the status of the equipment, such as "under restoration," "stopped," or "in operation." Additional information is added in chronological order from the "MA1" state to the "MA2" state, and from the "MA2" state to the "MA3" state. Note that when the time-series data reaches a predetermined number of stored data, the oldest data may be deleted.

The calculated value 194 is a value calculated by each functional unit of the recovery priority order identification device 1. Details will be described later.

The takt time data 195 is input by a user from an operation unit (not shown) and is stored in the first storage unit 19, for example. Takt time means the time required for processing one workpiece in each facility. Takt time is predetermined for each piece of equipment based on a production plan.

The upper limit buffer number data 196 is input by the user from an operation unit (not shown) and is stored in the first storage unit 19, for example. The upper limit number of buffers means the upper limit number of buffers in the

transport devices

41 and 42. The upper limit number of buffers is predetermined based on the

transport devices

41 and 42, the workpiece, and the like. Note that the upper limit number of buffers is an example of the upper limit quantity according to the present disclosure.

Next, each functional unit of the recovery priority order identification device 1 shown in FIG. 1 will be explained.
The information acquisition unit 11 acquires operating information 66 and manufacturing information 67 stored in the second storage unit 65 of the information management device 6. Specifically, the operation information 66 includes stop cause information indicating the cause of equipment stoppage, abnormality occurrence time information indicating when the abnormality occurred, stop time information indicating when the equipment was stopped, and when the equipment was restored. This information includes the indicated restoration time information and equipment status information indicating the status of each equipment. Specifically, the manufacturing information 67 is information including final serial number information indicating the number of processed works.

Additionally, the information acquisition unit 11 stores the acquired stop cause information and the abnormality occurrence time at which the abnormality occurred in the recovery time information table 191. Furthermore, the information acquisition unit 11 obtains a recovery time based on the acquired stop time information and recovery time information, and adds the recovery time to the recovery time information table 191. Note that the recovery time is determined by the difference value between the recovery time and the stop time. Further, the information acquisition unit 11 stores the acquired final serial number in the serial number table 192. Additionally, the information acquisition unit 11 adds the acquired equipment status information to the equipment status table 193. Note that the information acquisition unit 11 is an example of information acquisition means according to the present disclosure.

The buffer number calculation unit 12 calculates the number of buffers of the

transport devices

41 and 42. The buffer number calculation unit 12 calculates the number of buffers of the

transport devices

41 and 42 based on the final serial number in the serial number table 192. The determined number of buffers is stored in the calculated value 194 of the first storage unit 19. Note that the buffer number calculation unit 12 is an example of a buffer amount calculation means according to the present disclosure.

The average recovery time calculation unit 13 calculates the average value of recovery times. Based on the recovery time information table 191, the average recovery time calculation unit 13 calculates the average recovery time by dividing the sum of the recovery times for each stop factor of each facility by the number of stoppages for each stop factor of each facility. The determined average recovery time is stored in the calculated value 194 of the first storage unit 19. Note that the average recovery time calculation unit 13 is an example of recovery time calculation means according to the present disclosure.

The spare time calculation unit 14 calculates the spare time. In this embodiment, the production line is stopped when the buffers of the

transport devices

41 and 42 become clogged. Specifically, the production line is stopped when the number of buffers in the

transport devices

41 and 42 exceeds the upper limit. In this embodiment, the margin time means the time until the number of buffers reaches the upper limit. How to find the slack time will be described later. The obtained spare time is stored in the calculated value 194 of the first storage unit 19. Note that the spare time calculation unit 14 is an example of a spare time calculation unit according to the present disclosure.

The evaluation value calculation unit 15 calculates a recovery degree priority evaluation value. The recovery priority evaluation value is a value indicating the priority of recovery of stopped equipment. Specifically, the evaluation value calculation unit 15 calculates a recovery priority evaluation value based on the average recovery time and the margin time. The recovery priority evaluation value is obtained by subtracting the margin time from the average recovery time. Details will be described later. The obtained recovery priority evaluation value is stored in the calculated value 194 of the first storage unit 19. Note that the evaluation value calculation unit 15 is an example of evaluation value calculation means according to the present disclosure.

The priority specifying unit 16 specifies the recovery priority of the stopped equipment based on the obtained recovery priority evaluation value. Specifically, the priority order specifying unit 16 assigns a higher priority order to equipment with a higher recovery priority evaluation value among the stopped equipment. The priority order specifying unit 16 transmits the identified recovery priority order to the display device 80 along with the equipment identification information, the cause of the stoppage, the abnormality occurrence time, and the equipment state information. Note that the priority order specifying unit 16 is an example of a recovery priority order specifying means according to the present disclosure.

Based on the equipment status table 193, the determining unit 17 determines whether the equipment status of the stopped equipment has changed to a predetermined state. The change to the predetermined state is, for example, a change to the equipment restoration state. Further, the determining unit 17 determines whether there are a plurality of stopped facilities. Note that the determination unit 17 is an example of determination means according to the present disclosure.

The display management unit 18 sends correction data to the display device 80 in order to change the data stored in the display device 80. For example, the display management unit 18 sends, to the display device 80, correction data for equipment that has changed from an equipment stopped state to an equipment restored state and is now in an operating state. Note that the display management unit 18 is an example of display management means according to the present disclosure.

The display device 80 includes a display control section 81, a display section 82, and a third storage section 85. The third storage unit 85 has a recovery priority order table 86. As illustrated in FIG. 5, the recovery priority table 86 associates equipment identification information, "stop cause", "abnormality occurrence time", "equipment status", and "recovery priority". It is a table. The display control unit 81 stores the equipment identification information, the cause of the stoppage, the abnormality occurrence time, the equipment status information, and the recovery priority sent by the priority identification unit 16 in the recovery priority table 86, and performs the recovery. The priority order table 86 is displayed on the display section 82. In addition, the display control unit 81 erases or changes the corresponding data in the recovery priority table 86 according to the correction data sent by the display management unit 18 of the priority identification device 1, and updates the updated recovery priority table 86. It is displayed on the display section 82. The display unit 82 displays the recovery priority order table 86 under the control of the display control unit 81.

The information management device 6 includes an information management section 61, a sending section 62, and a second storage section 65. The second storage unit 65 has operating information 66 and manufacturing information 67. The information management unit 61 stores the operating information 66 and manufacturing information 67 transmitted by each PLC in the second storage unit 65. The sending unit 62 sends the operating information 66 and manufacturing information 67 stored in the second storage unit 65 to the recovery priority order identification device 1 at predetermined intervals. Note that the information management unit 61 is an example of information receiving means according to the present disclosure. Further, the sending unit 62 is an example of a sending means of the present disclosure. Furthermore, the second storage unit 65 is an example of storage means according to the present disclosure.

Next, an example of the hardware configuration of the recovery priority identification device 1 according to the present embodiment will be described with reference to FIG. 6. Note that the hardware configuration of the information management device 6 is the same as that of the recovery priority order identification device 1, so a description thereof will be omitted. As described above, the recovery priority order identification device 1 shown in FIG. 6 is realized by, for example, a computer such as a personal computer or a microcontroller.

As shown in FIG. 6, the recovery priority identification device 1 includes a control section 51, a main storage section 52, an external storage section 53, an operation section 54, a display section 55, an input/output section 56, and a transmitting/receiving section 57. The main storage section 52, the external storage section 53, the operation section 54, the display section 55, the input/output section 56, and the transmitting/receiving section 57 are all connected to the control section 51 via the internal bus 50.

The control unit 51 is configured by a CPU (Central Processing Unit), and according to the control program 59 stored in the external storage unit 53, the information acquisition unit 11, buffer number calculation unit 12, and average recovery time calculation of the recovery priority identification device 1 are performed. 13, a margin calculation section 14, an evaluation value calculation section 15, a priority specification section 16, a determination section 17, and a display management section 18.

The main memory section 52 is configured with a RAM (Random-Access Memory), loads the control program 59 stored in the external memory section 53, and is used as a work area for the control section 51.

The external storage unit 53 is composed of nonvolatile memory such as flash memory, hard disk, DVD-RAM, and DVD-RW. The external storage unit 53 stores in advance a program for causing the control unit 51 to perform the processing of the recovery priority order identification device 1, and also supplies data stored by this program to the control unit 51 according to instructions from the control unit 51. and stores the data supplied from the control unit 51. The first storage section 19 is configured as an external storage section 53.

The operation unit 54 is composed of a keyboard, a pointing device such as a mouse, and an interface device that connects the keyboard, pointing device, etc. to the internal bus 50. When the user inputs information to the recovery priority order identification device 1, the input information is supplied to the control unit 51 via the operation unit 54.

The display section 55 is composed of, for example, a liquid crystal display. When the user inputs information into the recovery priority order identification device 1, an operation screen is displayed.

The input/output section 56 is configured by a serial interface or a parallel interface.

The transmitting/receiving unit 57 is configured by a wireless communication device connected to a network, and a serial interface or a LAN (Local Area Network) interface connected thereto. When the display management section 18 sends the recovery priority data by e-mail, for example, the transmission/reception section 57 functions as the display management section 18 .

Information acquisition section 11, buffer number calculation section 12, average recovery time calculation section 13, margin time calculation section 14, evaluation value calculation section 15, priority order identification section 16, and determination section 17 of recovery priority order identification device 1 shown in FIG. , the processing of the display management section 18 and the first storage section 19 is performed by the control program 59, which controls the control section 51, the main storage section 52, the external storage section 53, the operation section 54, the display section 55, the input/output section 56, and the transmission/reception section 57. It is executed by processing using etc. as resources. Note that the hardware configuration is just an example, and can be changed and modified as desired.

The operation of the recovery priority order identification process by the recovery priority order identification device 1 will be explained.
Under the control of the PLCa 31, the A equipment 21 once receives a workpiece in a buffer, takes out the workpiece from the buffer and processes it, and after completing the processing, transports it to the B equipment 22 by the transport device 41. Under the control of the PLCb 32, the B equipment 22 temporarily receives the work from the A equipment 21 in a buffer, takes out the work from the buffer and processes it, and after completing the processing, transports it to the C equipment 23 by the transport device 42. Under the control of the PLC c 33, the C equipment 23 once receives the workpiece from the B equipment 22 in a buffer, takes out the workpiece from the buffer, processes it, and, after completing the processing, transports it to a subsequent stage.

During this time, the operation detection units 21a, 22b, and 23c monitor the operating states of the A equipment 21, B equipment 22, and C equipment 23, respectively, and notify the PLCa 31, PLC b 32, and PLC c 33. PLCa31, PLCb32, and PLCc33 notify the information management device 6 of operating information and manufacturing information. The information management unit 61 of the information management device 6 stores the operating information and manufacturing information transmitted from the PLCa 31, PLCb 32, and PLCc 33 in the second storage unit 65.

When the recovery priority order identification device 1 is activated, the operation information 66 and manufacturing information 67 stored in the second storage portion 65 are sent to the recovery priority order identification device 1 by the transmission unit 62 of the information management device 6. Subsequently, the recovery priority order identification device 1 starts the recovery priority order identification process illustrated in FIG. 7 .

First, the information acquisition unit 11 of the recovery priority identification device 1 acquires the operation information 66 and the manufacturing information 67 from the information management device 6, calculates the recovery time at the time of a past stoppage, and calculates the recovery time information in the first storage unit 19. Additional information is added to the table 191 (step S101). Specifically, the equipment identification information, the cause of the stoppage, and the abnormality occurrence time, which are included in the acquired operating information 66, are stored in the recovery time information table 191 of the first storage unit 19. The information acquisition unit 11 obtains the recovery time based on the stop time information indicating when the equipment was stopped and the recovery time information indicating when the equipment was restored, out of the acquired operating information 66. Note that the recovery time is the difference value between the recovery time and the stop time. The information acquisition unit 11 adds the obtained recovery time to the recovery time information table 191. Step S101 is an example of an information acquisition step according to the present disclosure.

The information acquisition unit 11 writes the current serial number in the serial number table 192 based on the acquired manufacturing information 67. Further, the information acquisition unit 11 adds the equipment status to the equipment status table 193 of the first storage unit 19 based on the acquired operating information 66.

The average recovery time calculation unit 13 calculates the average recovery time for each cause of outage for past outages of each facility based on the recovery time information table 191 (step S102). For example, in the example of FIG. 9, the number of times the equipment A is stopped due to the stop factor S1 is two, and the average recovery time is determined by adding the two recovery times TA1 and TA2 and dividing the sum by 2. Furthermore, if the number of times each equipment is stopped for each cause of stoppage is one, the recovery time for that one stoppage corresponds to the average recovery time. Note that the average recovery time is stored in the calculated value 194 of the first storage unit 19. In the example of FIG. 9, the number of recovery time data is small, but the average recovery time calculation unit 13 calculates the average recovery time based on the number of recovery time data accumulated from the past in the recovery time information table 191. Find recovery time.

Based on the equipment status table 193, the determination unit 17 determines whether there is a plurality of equipment that is stopped at the latest time (step S103). If it is determined that there is no stopped equipment or only one equipment is stopped (step S103: No), the process returns to step S101 and waits for the information management device 6 to transmit information next time.

On the other hand, if it is determined that there are multiple stopped facilities (step S103: Yes), the process advances to step S104. In step S<b>104 , the information acquisition unit 11 acquires the operating information 66 and manufacturing information 67 from the information management device 6 and adds them to each table in the first storage unit 19 .

The buffer number calculation unit 12 calculates the number of buffers in the transport devices 41 and 42 (step S105). Based on the serial number table 192, the buffer number calculation unit 12 calculates the difference value between the final serial number of the equipment in the previous process and the final serial number of the equipment in the subsequent process as the number of buffers. Specifically, as illustrated in FIG. 8, the number of buffers in the transport device 41 is a value obtained by subtracting the final serial number NB of the B equipment in the subsequent process from the final serial number NA of the A equipment in the previous process. The number of buffers in the transport device 42 is also found in the same way. Note that the determined number of buffers is stored in the calculated value 194 of the first storage unit 19.

The margin time calculation unit 14 calculates the margin time based on the number of buffers determined by the buffer number calculation unit 12, the upper limit buffer number data 196, and the takt time data 195 (step S106). In this embodiment, when a work is jammed, in other words, when the number of buffers in the conveying

devices

41 and 42 reaches the upper limit and the next work is not conveyed to the conveying

devices

41 and 42 and the work is jammed, the production The line stops. As described above, the margin time means the time until the number of buffers reaches the upper limit.

With reference to FIG. 10, the method for determining the margin time will be explained. For convenience, five pieces of equipment from equipment 1 to equipment 5 will be explained as an example. The workpieces are transported from equipment 1 to equipment 5 in order. As illustrated in FIG. 10, the number of buffers in the transport device 12H between equipment 1 and equipment 2 is four. Further, the number of buffers in the transport device 34H between the equipment 3 and the equipment 4 is two. Note that the upper limit of the number of buffers in both the transport devices 12H and 34H is six. The takt time of equipment 1 and the takt time of equipment 3 are both 10 seconds. Both equipment 2 and equipment 4 are stopped. The margin time of equipment 2 is 20 seconds, which is the product value of 2, which is obtained by subtracting the number of buffers 4 from the upper limit number 6 of the number of buffers of the transport device 12H, and the takt time of 10 seconds of equipment 1, which is the pre-process of equipment 2. It is. The obtained multiplication value of 20 seconds means the time until the number of buffers in the transport device 12H reaches the upper limit number. Similarly, the spare time of the equipment 4 is determined to be 40 seconds, as illustrated in FIG.

The evaluation value calculation unit 15 calculates a recovery degree priority evaluation value (step S107). As described above, the recovery priority evaluation value is a value indicating the priority of recovery. In this embodiment, the recovery degree priority evaluation value is obtained by subtracting the margin time from the average recovery time. The evaluation value calculation unit 15 obtains a recovery degree priority evaluation value by subtracting the margin time of each piece of equipment from the average recovery time for each stop factor of each piece of equipment. Note that the average recovery time calculated by the average recovery time calculation unit 13 and the margin time calculated by the margin time calculation unit 14 are stored in the calculated value 194 of the first storage unit 19. Step S107 is an example of an evaluation value calculation step according to the present disclosure.

The priority specifying unit 16 specifies the recovery priority based on the obtained recovery degree priority evaluation value (step S108). Specifically, the priority order identifying unit 16 identifies the higher priorities among the stopped equipment in order from the equipment with the highest recovery degree priority evaluation value. Equipment with a large recovery degree priority evaluation value has a large difference between the average recovery time and the margin time, and has a long recovery time and a short margin time, and therefore corresponds to equipment that requires priority restoration. Step S108 is an example of a recovery priority order identification step according to the present disclosure.

The priority order identification unit 16 transmits the identified recovery priority order to the display device 80 along with the equipment identification information, the cause of the stoppage, the abnormality occurrence time, and the latest equipment status information (step S109).

After step S109, the process returns to step S101.

Next, an example of the operation of display processing by the display device 80 will be described with reference to FIG. 11. The operation illustrated in FIG. 11 is executed when the display device 80 acquires the information transmitted through the process of step S109.

The display control unit 81 sorts the acquired information in descending order of recovery priority (step S201). Specifically, the display control unit 81 rearranges data in order of recovery priority starting from 1, as illustrated in FIG. Under the control of the display control unit 81, the display unit 82 displays the rearranged recovery priority order table 86 (step S202).

Next, an example of the operation of the corrected data sending process by the recovery priority order identification device 1 will be described with reference to FIG. 12. The operation illustrated in FIG. 12 is such that when the recovery priority order identification device 1 is activated and the information management device 6 sends the operation information 66 to the recovery priority order identification device 1, the modified data sending process shown in FIG. Start.

The information acquisition unit 11 acquires the operation information 66 and adds the latest equipment status included in the acquired operation information 66 to the equipment status table 193 of the first storage unit 19 (step S301). The determination unit 17 determines whether there has been a change in the status of the stopped equipment based on the equipment status table 193 (step S302). Specifically, the determination unit 17 determines whether the state has changed from the stopped state based on the latest time and the latest time in the equipment state table 193 illustrated in FIG. Determine whether the equipment is available.

If it is determined that there is no change in the state of the stopped equipment (step S302: No), the correction data sending process ends.

If it is determined that there is a change in the state of the stopped equipment (step S302: Yes), the display management unit 18 sends the target correction data to the display device 80 (step S303). Specifically, the display management unit 18 sends, for example, the equipment status of the equipment that has changed during restoration from the status of the stopped equipment to the display device 80.

The display control unit 81 updates the recovery priority table 86 in the third storage unit 85 based on the equipment status sent by the display management unit 18. Specifically, the display control unit 81 changes the equipment status of the recovery priority table 86 from "stopped" to "recovering". Furthermore, the display control unit 81 deletes data of the equipment whose equipment status has been switched to “in operation” from among the equipment in the recovery priority order table 86.

The production system 100 according to the embodiment has been described above. According to the production system 100, it is possible to obtain the average recovery time for each cause of a plurality of equipment stoppages. Further, it is possible to obtain a margin time indicating the time until the number of buffers in the transport device reaches a predetermined upper limit number. In addition, the average recovery time for each cause of the stoppage and the margin time that takes into account the number of buffers are used to identify the recovery priority of stopped equipment, so the recovery order that suppresses the decline in the production capacity of the production line can be determined. Can be properly identified.

(Modified example)
In the embodiment, the predetermined process is processing, but the present disclosure is not limited to this. The predetermined processing is not limited to processing, and may include physical or chemical processing applied to the object, measurement of the object, inspection of the object, evaluation of the object, and the like.

Similarly, in the embodiment, the processing target of equipment A 21 to equipment C 23 is a workpiece, but it may be a material, raw material, raw material, etc. In this case, a numerical value indicating a quantity such as weight or volume may be used instead of the serial number or the number of buffers. In this disclosure, quantity is an expression that includes numbers and quantities.

In the embodiment, the information management device 6 is configured as a separate device from the recovery priority order identification device 1, but the information management device 6 may be included in the recovery priority order identification device 1.

In the embodiment, the display device 80 is configured as a separate device from the recovery priority order identification device 1, but the display device 80 may be included in the recovery priority order identification device 1.

In the embodiment, the average value of the recovery time is determined, but any other type of representative value may be used as long as it achieves the effects of the present embodiment. For example, it may be the median or mode of recovery time.

Although the preferred embodiments have been described in detail above, they are not limited to the embodiments described above, and various modifications and substitutions can be made to the embodiments described above without departing from the scope of the claims. can be added.

Note that various embodiments and modifications of the present disclosure are possible without departing from the broad spirit and scope of the present disclosure. Moreover, the embodiments described above are for explaining this disclosure, and do not limit the scope of this disclosure. That is, the scope of the present disclosure is indicated by the claims rather than the embodiments. Various modifications made within the scope of the claims and within the meaning of the disclosure equivalent thereto are considered to be within the scope of this disclosure.

This application is based on Japanese Patent Application No. 2022-078195, filed on May 11, 2022. The entire specification, claims, and drawings of Japanese Patent Application No. 2022-078195 are incorporated herein by reference.

Hereinafter, various aspects of the present disclosure will be collectively described as supplementary notes.

(Additional note 1)
The plurality of facilities of a production line that includes a plurality of facilities that process objects to be processed, and a conveyance device that connects the facilities and conveys the objects to be processed from one facility to another facility. A recovery priority identification device that identifies the priority of restoration of stopped equipment when equipment stops,
information acquisition means for acquiring operation information including a stoppage factor that is a cause of the stoppage of each piece of equipment and equipment status information indicating a status of each piece of equipment; and information about processes of the plurality of pieces of equipment;
Buffer quantity calculation means for calculating the buffer quantity of each transport device based on the information acquired by the information acquisition means;
a recovery time calculation means for calculating a representative value of the recovery time from stoppage to recovery for each of the causes of the stoppage of the plurality of equipment based on the information acquired by the information acquisition means;
Based on the buffer quantity calculated by the buffer quantity calculation means and the predetermined takt time of each piece of equipment, a margin time indicating the time until the buffer quantity of the conveyance device reaches a predetermined upper limit quantity is determined. A surplus time calculation means,
Evaluation value calculation means for calculating a recovery degree priority evaluation value indicating the priority of restoration based on the representative value of the recovery time calculated by the recovery time calculation means and the slack time calculated by the margin time calculation means;
a recovery priority order identifying means for specifying the recovery priority order of the stopped equipment using the recovery degree priority evaluation value obtained by the evaluation value calculation means;
A recovery priority identification device comprising:
(Additional note 2)
The evaluation value calculation means calculates a subtracted value by subtracting the margin time from the representative value of the recovery time as a recovery degree priority evaluation value,
According to Supplementary Note 1, the recovery priority order specifying means specifies the recovery priority order to be high for the stopped equipment in which the recovery degree priority evaluation value calculated by the evaluation value calculation means shows a large value. Recovery priority identification device.
(Additional note 3)
The information regarding the process includes a final serial number corresponding to the number of processing targets on which the process was performed in the plurality of facilities,
The buffer quantity calculating means calculates the buffer quantity of each of the conveying apparatuses by calculating a difference value between the final serial numbers of the upstream front process and the downstream downstream process of the conveying apparatus.
The recovery priority order identification device according to Supplementary note 1 or Supplementary note 2.
(Additional note 4)
The information regarding the operation includes stop time information and recovery time information for each cause of the stop of the plurality of equipment,
The recovery time calculation means calculates the recovery time by calculating the difference between the recovery time and the stop time, adds the calculated recovery time for each cause of the stoppage of each equipment, and calculates the number of times the added recovery time is added. By dividing, find the average value of the recovery time for each stop factor of each of the facilities as a representative value,
The recovery priority order identification device according to any one of Supplementary Notes 1 to 3.
(Appendix 5)
The surplus time calculating means is configured to calculate a subtraction value by subtracting the buffer quantity in the upstream transport device from the upper limit number in the upstream transport device among the transport devices connected to the stopped equipment. , calculating the margin time of the stopped equipment by multiplying it by the takt time of the equipment in the previous process of the stopped equipment;
The recovery priority order identification device according to any one of Supplementary Notes 1 to 4.
(Appendix 6)
The recovery priority order specifying means transmits the recovery priority order together with information including the equipment state information and the stoppage factor to a display device that displays the recovery priority order,
determination means for determining whether there is a change in the equipment status of the stopped equipment based on the operation information acquired by the information acquisition means;
Further comprising: display management means for transmitting updated information to the display device when it is determined that there is a change in the equipment status of the stopped equipment;
The recovery priority order identification device according to any one of Supplementary Notes 1 to 5.
(Appendix 7)
comprising the recovery priority identification device according to any one of Supplementary Notes 1 to 6 and an information management device,
The information management device includes:
information receiving means for receiving information regarding the operation and information regarding the process;
storage means for storing the received information;
sending means for sending the received information to the recovery priority order identification device;
Recovery priority identification system.
(Appendix 8)
A recovery priority identification method for identifying the priority of restoration of the stopped equipment when equipment in a production line that performs a process on a processing target is stopped,
an information acquisition step of acquiring operation-related information and process-related information including equipment stoppage factors and status information;
an evaluation value calculation step of calculating a recovery priority evaluation value indicating the priority of recovery based on the information regarding the operation and the information regarding the process;
a recovery priority order identification step of identifying a recovery priority order of the stopped equipment using the recovery degree priority evaluation value obtained in the evaluation value calculation step;
A recovery priority identification method comprising:
(Appendix 9)
to the computer,
an information acquisition step of acquiring operation-related information and process-related information including equipment stoppage factors and equipment status information;
an evaluation value calculation step for calculating a recovery priority evaluation value indicating the priority of recovery based on information regarding operation and information regarding the process;
a recovery priority order identification step of identifying the recovery priority order of the stopped equipment using the recovery degree priority evaluation value obtained in the evaluation value calculation step;
A program to run.

1 Recovery priority identification device, 6 Information management device, 11 Information acquisition unit, 12 Buffer number calculation unit, 13 Average recovery time calculation unit, 14 Margin time calculation unit, 15 Evaluation value calculation unit, 16 Priority identification unit, 17 Judgment Department, 18 Display management department, 19 First storage section, 21 A equipment, 22 B equipment, 23 C equipment, 31 PLCa, 32 PLCb, 33 PLCc, 41, 42 Transport device, 50 Internal bus, 51 Control unit, 52 Main Storage unit, 53 External storage unit, 54 Operation unit, 55 Display unit, 56 Input/output unit, 57 Transmission/reception unit, 59 Control program, 61 Information management unit, 62 Sending unit, 65 Second storage unit, 66 Operation information, 67 Manufacturing Information, 80 display device, 81 display control unit, 82 display unit, 85 third storage unit, 86 recovery priority table, 100 production system, 191 recovery time information table, 192 serial number table, 193 equipment status table, 194 calculated value, 195 Takt time data, 196 Upper limit buffer number data.

Claims

The plurality of facilities of a production line that includes a plurality of facilities that process objects to be processed, and a conveyance device that connects the facilities and conveys the objects to be processed from one facility to another facility. A recovery priority identification device that identifies the priority of restoration of stopped equipment when equipment stops,
information acquisition means for acquiring operation information including a stoppage factor that is a cause of the stoppage of each piece of equipment and equipment status information indicating a status of each piece of equipment; and information about processes of the plurality of pieces of equipment;
Buffer quantity calculation means for calculating the buffer quantity of each transport device based on the information acquired by the information acquisition means;
a recovery time calculation means for calculating a representative value of the recovery time from stoppage to recovery for each of the causes of the stoppage of the plurality of equipment based on the information acquired by the information acquisition means;
Based on the buffer quantity calculated by the buffer quantity calculation means and the predetermined takt time of each piece of equipment, a margin time indicating the time until the buffer quantity of the conveyance device reaches a predetermined upper limit quantity is determined. A surplus time calculation means,
Evaluation value calculation means for calculating a recovery degree priority evaluation value indicating the priority of restoration based on the representative value of the recovery time calculated by the recovery time calculation means and the slack time calculated by the margin time calculation means;
Recovery priority order identifying means for identifying the recovery priority order of the stopped equipment using the recovery degree priority evaluation value obtained by the evaluation value calculation means;
A recovery priority identification device comprising:
The evaluation value calculation means calculates a subtracted value by subtracting the margin time from the representative value of the recovery time as a recovery degree priority evaluation value,
2. The recovery priority specifying means specifies the recovery priority to be high for the stopped equipment whose recovery degree priority evaluation value determined by the evaluation value calculation means is a large value. recovery priority identification device.
The information regarding the process includes a final throughput quantity corresponding to the quantity of the processing target for which the process was performed in the plurality of facilities,
The buffer quantity calculating means calculates the buffer quantity of each of the conveying apparatuses by determining the difference between the final passing quantities between the upstream front process and the downstream downstream process of the conveying apparatus.
The recovery priority order identification device according to claim 1 or claim 2.
The information regarding the operation includes stop time information and recovery time information for each cause of the stop of the plurality of equipment,
The recovery time calculation means calculates the recovery time by calculating the difference between the recovery time and the stop time, adds the calculated recovery time for each cause of the stoppage of each equipment, and calculates the number of times the added recovery time is added. By dividing, find the average value of the recovery time for each stop factor of each of the facilities as a representative value,
The recovery priority order identification device according to claim 3.
The surplus time calculating means is configured to calculate a subtraction value obtained by subtracting the buffer quantity in the upstream conveying apparatus from the upper limit quantity in the upstream conveying apparatus among the conveying apparatuses connected to the stopped equipment. , calculating the margin time of the stopped equipment by multiplying it by the takt time of the equipment in the previous process of the stopped equipment;
The recovery priority order identification device according to claim 4.
The recovery priority order specifying means transmits the recovery priority order together with information including the equipment state information and the stoppage factor to a display device that displays the recovery priority order,
determination means for determining whether there is a change in the equipment status of the stopped equipment based on the operation information acquired by the information acquisition means;
Further comprising: display management means for transmitting updated information to the display device when it is determined that there is a change in the equipment status of the stopped equipment;
The recovery priority order identification device according to claim 5.
comprising the recovery priority identification device according to claim 1 and an information management device,
The information management device includes:
information receiving means for receiving information regarding the operation and information regarding the process;
storage means for storing the received information;
sending means for sending the received information to the recovery priority order identification device;
Recovery priority identification system.
A recovery priority identification method for identifying the priority of recovery of the stopped equipment when equipment in a production line that processes a processing target is stopped,
an information acquisition step of acquiring operation-related information and process-related information including equipment stoppage factors and status information;
an evaluation value calculation step of calculating a recovery priority evaluation value indicating the priority of recovery based on the information regarding the operation and the information regarding the process;
a recovery priority order identification step of identifying a recovery priority order of the stopped equipment using the recovery degree priority evaluation value obtained in the evaluation value calculation step;
A recovery priority identification method comprising:
to the computer,
an information acquisition step of acquiring operation-related information and process-related information including equipment stoppage factors and equipment status information;
an evaluation value calculation step of calculating a recovery degree priority evaluation value indicating the priority of recovery based on the information regarding the operation and the information regarding the process;
a recovery priority order identification step of identifying a recovery priority order of the stopped equipment using the recovery degree priority evaluation value obtained in the evaluation value calculation step;
A program to run.