JP2011198201A - Misoperation preventing system and method for power source switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system and a method that can prevent the misoperation of a power source switch in spite of comparatively simple configuration in carrying out a plurality of operations regarding a facility within the supply range of a power source.SOLUTION: This misoperation preventing system includes a switch information recording section that records identification information of the power source switch; a first recording means functioning as a forbidding means of the power source and including a recording part that records own identification information; a lower layer side recording means including a recording part that records own identification information; a database associating identification information of the switch information recording part, first recording means and lower layer side recording means for every hierarchy; a terminal capable of inputting the identification information of the switch information recording part, first recording means and lower layer side recording means; a collating means for collating the identification information input to the terminal, with the database; and a database recording means for recording collation data into the database based on the collation by the collating means. The method uses this system.

Description

  The present invention relates to a system and method capable of preventing erroneous operation of a power source switch in maintenance work of a plant or the like.

  Obviously, maintenance work for large-scale plants such as hot rolling lines at steelworks is performed after all power sources have been shut off in the area where maintenance work is performed. It is necessary to input the power source after evacuation.

  The power sources in the plant are mainly electric motors and hydraulic / pneumatic solenoid valves, which usually have individual switches. That is, there are as many switches as there are motors and solenoid valves. Furthermore, a power source switch in which they are grouped in blocks is installed in the upstream, and a power source switch is arranged in multiple layers in the upstream, and the total number of switches is enormous (for example, (About 1000 in a large-scale steel plant). In general, a plurality of maintenance operations related to the plant are performed in parallel. For this reason, the person in charge of operating the power source switch needs to reliably shut off the power source without erroneously operating unnecessary or irrelevant switches among many switches.

  On the other hand, it is necessary to prevent the shut-off power source from being accidentally turned on before the maintenance work is completed. Here, in one maintenance work, the work is often divided into machinery, instrumentation, electricity, etc., and the worker in charge often handles the work. Therefore, it is necessary for the person responsible for operating the power source for the maintenance work to check that all the work related to the power source has been completed before turning on the power source, and this confirmation must be made with certainty.

As a general technique for preventing the power source from being erroneously inserted, a so-called prohibition tag and a tag as a work permit linked to the so-called prohibition tag are used. A specific example of the usage mode will be described with reference to FIG.

At the start of work: When the maintenance work is started, the person A responsible for operating the power source switch of the maintenance work shuts off the power source that covers the work range and displays the prohibition tag, the parent tag a, on the power source that has been shut off. . Next, the operation manager A distributes one child tag b corresponding to the work permit to the work manager Bi of each work subject. The work manager Bi distributes the grandchild tag c to each worker Ci-j managed by the work manager Bi. Each worker Ci-j receives the distribution of the grandchild tag c and starts his work.
During work: Work manager Bi and each worker Ci-j carry child tag b and grandchild tag c so that they are not lost during their work.
At the end of the work: Each worker Ci-j returns the grandchild tag c distributed to himself / herself to the work manager Bi after the completion of the work. The work manager Bi confirms that all the distributed grandchild tags c have been returned, and returns the child tags b distributed to him to the operation manager A. The person in charge of operation A confirms that all the child tags b have been returned, collects the parent tag a for the power source, and turns on the switch.

  Conventionally, confirmation regarding these distribution / return is usually performed manually. If the confirmation is incomplete, there is a possibility that the power source may be turned on even during work. For example, in the case of a large-scale plant, the total issued number of child tags and grandchild tags on one work day may reach several hundred. In other words, there may be over 50 grandchild tags managed by one work manager, and there has been a concern that the grandchildren will be returned accidentally without returning all the grandchild tags until now. .

  In this method, whether the switch to be operated by the person in charge of operation A is a power source to be cut off or turned on is not necessarily linked, and a switch different from the power source switch to be operated is cut off.・ There was also a concern that it would be thrown in.

  Therefore, in order to prevent such an erroneous operation of the power source, a method for electronically confirming the completion of work has been demanded. For example, Patent Document 1 is a system including a device tag, a display tag, and a portable terminal, and is an element that is installed in an individual device, displays a device number that identifies the device, and electronically records the device number An RFID tag that is temporarily installed in a device that performs the operation when working on the device, and that displays the device number of the device and the operation content for the device and electronically outputs the device number Including a display tag, a device that electronically reads the device number from the device tag and the RFID tag of the display tag, and confirming the installation of the display tag and monitoring the power station by comparing the device number read by the mobile device An equipment misoperation prevention system is disclosed in which information is shared with a room or the like to prevent erroneous operation of equipment such as a plant. Further, Patent Document 1 is an equipment misoperation prevention system that prevents an erroneous operation of equipment such as a plant, and is installed in an individual equipment. The equipment number for identifying the equipment is displayed and the equipment number is electronically displayed. Temporarily installed on the device tag including the recorded element and the device that performs the operation when working on the device, the device number of the device and the operation content for the device are displayed, and the device number is electronically recorded On the control panel that monitors the status of the device that is operated in relation to the work and the parent tag including the element, the device number of the device is temporarily installed at a position to perform the operation in association with the work. And a child tag including an element that electronically records the device number, and a control unit that electronically obtains the device number from each element of the device tag, the parent tag, and the child tag. Characterized by comprising And the equipment number read from the RFID tag of the parent tag collected by the control device, and the equipment number read from the RFID tag of the child tag collected from the control panel. Further, there is also disclosed an equipment misoperation prevention system (claim 13) characterized in that the total number of parent tags and child tags is determined by comparing the device numbers registered in the database.

JP 2006-146749 A

  The system disclosed in Patent Literature 1 is based on the device number of a device to be worked, and associates work information with the device number to grasp and manage the work status. Therefore, for example, when the power source is shut off, the device number recorded on the device tag and the device number recorded on the display tag (parent tag) are collated to prevent erroneous shut-off. In addition, it has excellent significance such as real-time management of work status.

  However, on the other hand, in terms of preventing erroneous operation of the power source, it is not necessary to grasp detailed work progress (for example, in real time) of each work target device. In this system, the following problems may occur.

  In the system according to Patent Document 1, the device tag, the display tag (parent tag), and the child tag include an RFID tag. As a result, device numbers are collated with each other and with the database, and the work progress status and the collection status of the bills are electronically confirmed. However, since radio waves emitted from RFID are reflected and diffracted, when a device tag attached to a switch arranged in proximity is read using a mobile terminal, a plurality of tags are read simultaneously. In such a case, there is a possibility that another power source may be shut off by operating a different switch instead of the switch that must be operated by mistake (at this time, further than the power source to be cut off). If the upstream power source is shut off, there will be no problem with the intended maintenance work, but it will interfere with other work.) That is, the congestion function that is an advantage of RFID may give a false recognition when identifying a specific device. In addition, power source switches are usually attached to an iron casing, and in the electromagnetic induction system of RFID, radio waves (magnetic flux) emitted from the reading terminal are shielded by the casing, making reading unstable. There is also a fear.

Further, the child tag in Patent Document 1 is temporarily installed on a device or work board, and has a different meaning from the hierarchical work permit as described in the example of the prohibition tag described above. From the viewpoint of preventing erroneous operation (incorrect insertion) of the power source, as described above, the parent tag, which is a prohibited tag, is displayed on the device, but the child tag and grandchild tag have a work permit meaning. You should always carry it with you during your work (otherwise there is a risk of losing it or someone else accidentally attaching / detaching / returning it). In that case, the child tag or grandchild tag is always carried by the operator in the chest pocket or pants pocket during work, so it is always covered with sweat or has a bending force when working in a cramped place. In addition, after the work is finished, it is shocked if it is collected in a collection box and handled in a messy manner.
If a strong guard is attached for protection, portability is reduced. In addition, the RFID antenna is relatively large, and if it is attached to a tag, the tag itself also becomes large, which also reduces portability. An RFID tag is a combination of an IC chip and an antenna such as a copper wire or aluminum for wireless communication, and is far more expensive than a barcode using a code printed on paper. Furthermore, a device using a special material such as a metal-compatible RFID has a higher cost and is not suitable for a large-scale plant system as a target of the present application.

  As described above, in the aspect in which maintenance work is performed while carrying a child tag or a grandchild tag, the system described in Patent Document 1 cannot be used, and a new power source that can prevent erroneous operation of a power source in a hierarchical instruction system can be used. System was needed.

  The present invention has been made in view of the above-described problems. For example, a plurality of operations related to equipment within a power supply range of a certain power source, such as maintenance work, is a relatively simple configuration. It is an object of the present invention to provide a system and method that can prevent erroneous operation of a power source switch.

In order to solve the above problems, the present invention has the following configuration. That is,
In the first aspect of the present invention, the power source is shut off and turned on at the first level, and the work downstream of the power source is performed at the nth level (n is an integer of 2 or more). Switch system in which the power source switch identification information is recorded as a bar code or QR code. A first recording means, a first recording means provided in the first hierarchy, functioning as a power source prohibiting means, and having a recording part in which its own identification information is recorded in a barcode or QR code; Identification information of a lower layer side recording means, a switch information recording unit, a first recording means, and a lower layer side recording means provided for each of the n hierarchies and having a recording unit in which its own identification information is recorded in a barcode or QR code The database, the switch information recording unit, the first recording means, and the identification information of the lower layer recording means that can be input can be input, and the identification information input to the terminal is compared with the database. And a database recording means for recording the collation data into the database based on the collation by the collation means.

  In the first aspect of the present invention, “perform work downstream of the power source in the nth layer (n is an integer of 2 or more)” means, for example, when n = 3, the power source is shut down in the first layer. It means that the operation is performed and the work downstream of the power source is performed in the second and third layers. In this case, for example, the third hierarchy can be a hierarchy downstream of the second hierarchy. “At least n-level indication system” means, for example, an indication system having three layers of a first layer, a second layer, and a third layer when n = 3. The “instruction system” refers to an instruction system in which predetermined information can be exchanged between one layer and another layer and within the same layer. The “switch information recording unit” is not particularly limited as long as it is a recording unit in which identification information of the switch of the power source is recorded. For example, a recording unit such as a barcode provided on a tag or the like is switched. It can be an information recording unit. “Lower-layer-side recording means provided for each of the second to n-th layers” means, for example, that when n = 3, the second recording means (lower-layer-side recording means) is provided in the second hierarchy, and the third hierarchy Means that a third recording means (lower-layer recording means) is provided. “First recording means and lower layer side recording means” means, for example, when n = 3, three recording means: a first recording means and a second recording means and a third recording means as lower layer side recording means Means. These recording means are not particularly limited as long as their own identification information can be recorded and the identification information can be input and read from the terminal. For example, it is preferable to use a tag provided with a recording unit. The “database” is the identification information of the switch information recording unit, the first recording unit, and the lower layer side recording unit associated with the above hierarchy. Specifically, as with the maintenance work instruction system, the recording unit Each identification information such as is made into a database for each hierarchy. The “terminal” is one that can input identification information of the switch information recording unit, the first recording unit, and the lower layer side recording unit. Specifically, the identification information can be read from the recording unit of the recording unit. The ones made are preferred. The “collation means” is not particularly limited as long as it is a means for collating the identification information input to the terminal with the identification information in the database (identification information stored in a database). The “database recording means” is not particularly limited as long as it is means for recording the collation data obtained by the collation means into the database. Specifically, based on the collation by the collation means, data relating to the return status of each recording means can be recorded in the database.

  In the first aspect of the present invention, it is preferable to include a lock unit that locks the input of the power source based on the data recorded in the database by the database recording unit. For example, if it is determined by the data recorded from the database recording means to the database that the power system is not yet suitable for the maintenance system, the power source is locked. This is because erroneous input of the source can be prevented more appropriately.

  In the first aspect of the present invention, there may be a configuration in which a plurality of power sources or power source switches exist, and the instruction system is provided for each power source or each power source switch. Maintenance work is not limited to a configuration in which only one power source (or power source switch) is provided. For example, maintenance work can be performed by shutting off multiple power sources in one office, building, or line. It is not uncommon to be struck. Even in such a case, by providing an instruction system according to the present invention for each power source (or each switch) and providing a system having other configurations, the system can be shut off while having a relatively simple system configuration. It is possible to electronically identify a plurality of switches that should be performed, and at the end of the maintenance work, it is possible to electronically confirm the collection of work permits of each worker and prevent erroneous input of the power source.

  The second aspect of the present invention is a method for preventing erroneous operation of a power source using the system according to the first aspect of the present invention.

  According to the present invention, for example, in maintenance work of a large-scale plant, it is possible to electronically specify a switch to be shut off while having a relatively simple system configuration, and collect the work permit of each worker at the end of the maintenance work. It is possible to provide a system and method that can be confirmed electronically and prevent erroneous input of a power source.

A technique used in the past to prevent accidental insertion of a power source, using a prohibition tag (parent tag) and a tag (child tag, grandchild tag) as a work permit linked to it. It is the schematic for demonstrating. It is a figure showing roughly the system of the present invention concerning one embodiment. It is a flowchart which shows the flow of the maintenance operation | work using the system of this invention which concerns on one Embodiment. It is the schematic for demonstrating the evaluation method employ | adopted in the Example.

  FIG. 2 shows an example of a system according to the present invention. As shown in FIG. 2, the system 100 according to the embodiment includes a power source 1, an instruction system 5, a terminal 20, a verification unit 30, a database recording unit 40, and a database 50. In FIG. 2, it is assumed that the instruction system in the system consists of three layers (n = 3). The indication system 5 is provided in the first hierarchy with the switch information recording unit 10 in which information on the switch of the power source 1 is recorded, and functions as a prohibiting unit for the power source 1 and also has a record in which its identification information is recorded. , A second recording means (lower-layer recording means) 12, 12,..., And a third hierarchy. , And third recording means (lower layer side recording means) 13, 13,... Having a recording unit in which their identification information is recorded. Hereinafter, after describing each configuration provided in the system 100, maintenance work using the system 100 will be described.

  The power source 1 is a conventionally known power source. For example, when the system 100 is applied to a plant, the power source 1 is generally an electric motor or a hydraulic / pneumatic solenoid valve. The power source 1 is provided with a switch, and the power source 1 is shut off and turned on by operating the switch.

  The switch information recording unit 10 used in the instruction system 5 is a recording unit in which identification information of the switch of the power source 1 is recorded. As the switch information recording unit 10, one capable of recording identification information related to the switch of the power source 1 can be used without particular limitation. In particular, it is preferable to use either a QR code or a barcode. FIG. 2 illustrates a mode in which only one power source 1 is used. However, as will be described later, for example, a power source 1 (or a switch of the power source 1) to be turned on / off in maintenance work. When there is a plurality of switch information recording units 10, 10,... Adjacent to each other, the switch information recording unit 10 having a diffraction / diffusion function such as RFID is used. , The recording units 10, 10,... Cannot be individually identified (that is, the recording units 10, 10,... Are read together), and switch information may be erroneously transmitted. . In this regard, if a QR code or a bar code is used as the recording unit 10, even when a plurality of recording units 10 are provided adjacent to each other, each can be appropriately identified. Moreover, when the power source 1 (or the switch of the power source 1) becomes a huge quantity like a large-scale plant, the cost concerning switch information recording part 10,10, ... will increase. In this respect, the use of a QR code or a bar code can reduce the cost compared to the case of using RFID. The switch information recording unit 10 may be provided in a place where the operator can recognize that it is a recording unit related to the switch of the power source 1 in the system 100. For example, the switch information recording unit 10 is provided beside the switch of the power source 1. It is preferable.

  The first recording means 11 used in the instruction system 5 is provided in the first hierarchy of the instruction system 5 and functions as a prohibiting means of the power source 1 and includes a recording unit in which its own identification information is recorded. . The specific form such as the size, material, etc. of the first recording means 11 is not particularly limited as long as it can be appropriately recognized by the operator. ) Can be used as the first recording means 11. Or it is good also as a rod-shaped member etc., but it is preferable to set it as a tag from a viewpoint made into the thing which is easy to visually recognize as a prohibition means. When a tag is used as the first recording means 11, a tag having a size of about 6.5 × 20 cm and a thickness of about 2 mm and made of an acrylic resin and provided with a recording unit can be used. The recording unit provided in the first recording unit 11 is not particularly limited as long as it can record its own identification information, but it is preferable to use a QR code or a barcode. The first recording means 11 is displayed on the switch itself or at the side of the switch during the operation, but when there are a plurality of switches of the power source 1 as described above, the plurality of switches are provided close to each other. In this case, by using a QR code or a bar code as the recording unit, it is possible to appropriately identify each piece of information of the first recording unit 11 without reading error. Further, as described above, it is preferable to use a QR code or a barcode from the viewpoint of cost. The identification information recorded in the recording unit of the first recording unit 11 will be described later.

  The second recording means 12, 12,... Used in the instruction system 5 are lower layer recording means provided in the second hierarchy and provided with a recording unit in which their own identification information is recorded. In the instruction system 5, the first hierarchy and the second hierarchy are associated with each other, and specifically, the instruction system in which the downstream operation is performed in the second hierarchy with the first hierarchy as the backbone. It is said that. That is, as shown in FIG. 2, a plurality of second recording means 12, 12,... Are associated with the first recording means 11. The specific form such as the size, material, etc. of the second recording means 12 is not particularly limited as long as it can be easily carried by an operator and can be properly recognized. For example, a tag having a recording unit A plurality of (child tags) are prepared, and these can be used as the second recording means 12, 12,. Or it is good also as a rod-shaped member. When a bill is used as the second recording means 12, it is preferable to use a bill having a size of about 6.5 × 10 cm and a thickness of about 2 mm and made of an acrylic resin and provided with a recording portion. The recording unit provided in the second recording unit 12 is not particularly limited as long as it can record its own identification information, but, like the first recording unit 11, a QR code or a barcode can be used. preferable. The identification information recorded in the recording unit of the second recording unit 12 will be described later.

  The third recording means 13, 13,... Used in the instruction system 5 are lower-layer recording means that are provided in the third hierarchy and have a recording unit in which their identification information is recorded. In the instruction system 5, the second hierarchy and the third hierarchy are related to each other. Specifically, the instruction system is such that the downstream operation is performed in the third hierarchy with the second hierarchy as the backbone. It is said that. That is, as shown in FIG. 2, the second recording means 12 has a plurality of third recording means 13, 13,. The specific form such as the size, material, etc. of the third recording means 13 is not particularly limited as long as the operator can appropriately recognize it. ) Are prepared, and these can be used as the third recording means 13, 13,. The shape and material of the third recording means are the same as those of the second recording means. The identification information recorded in the recording unit of the third recording unit 13 will be described later.

  Each of the recording means 11, 12, and 13 is preferably distinguished not only based on the identification information but also in appearance. For example, the recording means 11, 12, and 13 can be distinguished in appearance by using identification information written as characters or using specific symbols.

  The identification information recorded in the switch information recording unit 10 and the recording units of the first to third recording units 11, 12, and 13 and the form of each layer in the instruction system 5 will be described in detail. 2, in the instruction system 5, the switch of the power source 1, the switch information recording unit 10, the first recording means 11 (parent card), the second recording means 12, 12,... , And third recording means 13, 13,... (A plurality of grandchild tags) are hierarchized as follows. That is, in the first hierarchy, the switch of the power source 1, the switch information recording unit 10 and the first recording means (parent tag) 11 are used, and the recording unit of the parent tag is a prohibited tag of the switch of the power source 1. Information (100) is recorded (hereinafter, the parent tag is referred to as a parent tag (100)). In the second hierarchy, a plurality of second recording means (child tags) 12, 12,... Associated with the parent tag are used, and in the recording part of each child tag, the i-th string associated with the parent tag (100) is used. Information (1i0) indicating that it is a child tag is recorded (hereinafter, this child tag is referred to as a child tag (1i0)). In the third hierarchy, a plurality of third recording means (grandchild tags) 13, 13,... Associated with any of the plurality of child tags are used, and the subtag (1i0) is stored in the recording part of each grandchild tag. Information (1ij) indicating that it is the j-th grandchild tag to be linked is recorded (hereinafter, this grandchild tag is referred to as grandchild tag (1ij)). That is, in the instruction system 5, the parent tag (100) is used as the first recording means 11, and the child tags (110), (120), ..., (1i0), ... as the second recording means 12, 12,. , And grandchild tags (1i1), (1i2),..., (1ij),.

  The terminal 20 inputs (reads) identification information recorded in each recording unit of the first recording unit 11, the second recording unit 12, and the third recording unit 13 and identification information recorded in the switch information recording unit 10. It was made possible. For example, when each recording unit is a barcode, the terminal 20 uses a device that can read the barcode. In particular, it is preferable to use the terminal 20 that can read both the barcode and the QR code. The terminal 20 is preferably a portable terminal from the viewpoint that the user can easily carry it. In FIG. 2, the system 100 is described as having only one terminal 20, but the terminal 20 shares the database 50 and the like, and is based on the number of hierarchies or the number of users (responsible persons). It is preferable that a plurality are provided. Accordingly, the terminal 20 can be used for each level or for each user in each level, and workability can be improved when the return status of each recording means (tag) 11, 12, 13 is confirmed. it can. Further, the terminal 20 may be capable of displaying identification information of each recording means 11, 12, 13 and the like collated and recorded by the collating means 30 and the database recording means 40 described later. Specifically, it is preferable to be able to display information relating to the return status of each recording means 11, 12, 13 and the like. Specific information displayed on the terminal 20 will be further described later.

  The collation means 30 is a means for collating each identification information input to the terminal 20 with a database 50 described later. In FIG. 2, the collating unit 30 is independent from the terminal 20, but the collating unit 30 may be incorporated in the terminal 20 or a database management system for constructing the database 50. As the verification unit 30, a known recording processing device or the like can be used.

  The database recording unit 40 is a unit that records collation data into the database 50 based on the collation by the collation unit 30. In FIG. 2, the database recording means 40 is independent from the terminal 20, but the database recording means 40 may be incorporated in the terminal 20 or a database management system for constructing the database 50. As the database recording means 40, a known recording processing apparatus can be used. The recorded data is displayed on the terminal 20 by the database recording means 40. Specifically, for example, when the recording means (tags) 11, 12, 13 are returned, the data relating to the return status of the tags is stored in the database recording means 40 based on the identification information input / read by the terminal 20. Can be recorded in the database 50 and the recorded information can be displayed on the terminal 20. Further, when the returned tag is not appropriate, it is preferably displayed on the terminal 20 so that the user of the terminal 20 can easily determine whether or not the returned tag is appropriate.

  The database 50 associates the identification information recorded in the recording units of the first recording unit 11, the second recording unit 12, and the third recording unit 13 for each layer. That is, the database 50 can be a database of hierarchical information similar to that of the instruction system 5. The database 50 can be constructed by, for example, a known database management system.

  In the system 100, when each recording means 11, 12, 13 etc. is returned, the recording means 11, 12, 13 recorded in the database 50 based on the data relating to each identification information input / read to the terminal 20 It is preferable that a lock unit (not shown) is provided for locking the input of the power source 1 when it is determined that the return status is not complete. The lock means is not particularly limited as long as the lock of the power source 1 is executed / released based on the collation data recorded in the database 50 by the database recording means 40. For example, known locking means that can lock the operation of the switch of the power source 1 can be used. Note that the verification data related to the return status may be sent to the lock unit from any of the terminal 20, the verification unit 30, the database recording unit 40, and the management system that manages the database 50.

  The system 100 according to the present invention has the above-described configuration. By using such a system 100 as described below and exchanging information between each component, for example, it is possible to prevent erroneous operation of the switch of the power source 1 in the first hierarchy during maintenance work of a plant or the like. it can. Hereinafter, with reference to FIG. 2 and FIG. 3, the operation and operation of the system 100 at each stage before the maintenance work, at the start of the maintenance work, during the work, and at the end of the work will be described in detail. A method for preventing erroneous operation of the power source 1 used will be described.

1. Before work (process S1, process S2)
As shown in FIG. 2 and FIG. 3, the person in charge A of the power source 1 operates the switch of the power source 1 that needs to be shut off for the maintenance work and the prohibition tag (parent tag, That is, the first recording means 11), the work execution group related to the maintenance work, the work manager who supervises the work group (in charge of electrical equipment, the equipment in charge of mechanical equipment, etc.) and the work permission tag (child tag) distributed to them. And the second recording means 12, 12,... And the third recording means 13, 13,.

  A switch information recording unit 10 (bar code) in which the identification number of the switch is recorded is displayed beside the switch of the power source 1, and the parent tag, the child tag, and the grandchild tag are barcodes in which their identification numbers are recorded. Has a label. It is possible to collate with the database 50 by reading each barcode reading terminal 20.

  As described above, the database 50 is hierarchized as follows. That is, as shown in FIG. 2, information (100) indicating that the switch is prohibited is recorded as the parent tag data. Each child tag is recorded with information (1i0) indicating that it is the i-th child tag associated with the parent tag (100). Each grandchild tag is recorded with information (1ij) indicating that it is the jth grandchild tag associated with the child tag (1i0).

2. At the start of maintenance work (process S3, process S4)
2-1 Shut off of power source (Step S3)
At the start of the work, the person in charge A of the power source 1 goes to the switch 1 carrying the terminal 20 and reads the bar code of the switch and the bar code of the prohibited tag (parent tag). The terminal 20 compares the read bar code with the database 50 downloaded to the terminal 20 and matches the switch and the prohibition tag (that is, whether the switch is a switch of the power source 1 and the prohibition tag). Is a parent tag (100). If they match, OK is displayed, and if they do not match, NG is displayed (N1). When the OK is displayed (Y1), the person in charge A of the power source 1 operates the switch to shut off the power source and displays the parent tag (100) on the switch.

2-2 Distribution of child tags and grandchild tags (process S4)
The person in charge A of the power source 1 distributes one child tag (1i0) to the work manager Bi of each work after the power source 1 is shut off. The work manager Bi distributes the required number of grandchild tags for the workers who work under the supervision of the work manager Bi (for example, if there are n workers, the grandchild tags (1i1) to (1in) are distributed. .) That is, the work manager Bi distributes the grandchild tag (1ij) to the worker Ci-j. The worker Ci-j starts work after the grandchild tag (1ij) is distributed.

3. During maintenance work (process S5)
The work manager Bi and each worker Ci-j carry out their respective tasks while always carrying them so that their child tags and grandchild tags are not lost or returned accidentally.

4). At the end of maintenance work (process S6 to process S11)
4-1 Collection of child tags and grandchild tags (steps S6 to S9)
The worker Ci-j returns his grandchild tag (1ij) to the work manager Bi after completing his work. The work manager Bi reads the barcode of his child tag (1i0) and the returned grandchild tag with the terminal 20, and collates with the database 50. If the returned grandchild tag is a grandchild tag (1ij), data indicating that the grandchild tag (1ij) has been returned is recorded in the database 50 and displayed to the terminal 20 to that effect. In the unlikely event that the returned grandchild tag is not associated with the child tag (1i0) (N2), that fact is displayed through the terminal 20 or warned by a warning sound or the like, and the work manager Bi The operator who has returned the grandchild tag is urged to notify it and can take appropriate measures such as investigating the cause of the misunderstanding of the grandchild tag. The work manager Bi performs the same process for all grandchild tags of the managed workers. The terminal 20 displays the return status of each grandchild tag, and the work manager Bi can check this status each time. When workers, work names, and the like are linked to the grandchild tag in the database, and the grandchild tags are distributed along the linkage, it is possible to grasp the completion status of each work.

  When the return of all grandchild tags managed by the work manager Bi is input to the database 50 (Y2), this is displayed through the terminal 20. The work manager Bi confirms that all the grandchild tags are returned, and then returns his child tag “1i0” and all grandchild tags to the operation manager A of the power source 1.

  The operation manager A reads the barcode of the returned child tag with the terminal 20 and collates it with the database 50. When the returned child tag is a child tag (1i0), data indicating that the child tag (1i0) has been returned is recorded in the database 50, and this is displayed on the terminal 20. However, when all grandchild tags associated with the child tags (1i0) have not been returned (N3), this is displayed through the terminal 20 and all grandchild tags associated with the child tags (1i0) have not been collected. Is warned. As a result, the operation manager A is prompted to notify the work manager Bi who has returned the child tag to that effect, and can take appropriate measures such as checking for return omission. Further, when the returned child tag is not linked to the parent tag (100) (N3), the same is applied, and measures such as a check for a mistake in the tag are taken.

  The person in charge of operation A performs the same process for all child tags associated with the parent tag “100”. The terminal 20 displays the return status of each tag, and the person in charge of operation A can check this status each time. When the return of the total number of child tags managed by itself is recorded in the database 50 (Y3), a message to that effect is displayed through the terminal 20. In this way, the operation manager A confirms the return of all the child tags.

4-2 Input of power source (step S10, step S11)
The person A in charge of operation of the power source 1 goes to the switch to be operated and reads the barcode of the switch and the barcode of the parent tag displayed on the switch at the terminal 20.

  The read barcode is collated with the database 50, and if the switch and the parent tag are the switch and the parent tag 100 related to the power source 1, the switch can be operated on the terminal 20 (that is, the power source 1 is turned on). Is displayed (Y4). By this display, the operation manager A can collect the parent tag (100), operate the switch, and turn on the power source 1.

  On the other hand, as a result of reading each bar code, when all the child tags and grandchild tags linked to the parent tag (100) have not been collected, or the read bar code is a switch of the power source 1 or the parent tag (100). When it is not either or both (N4), the fact that the switch cannot be operated is displayed on the terminal 20 or warned by a warning sound or the like. As a result, the operation manager A can be prevented from turning on the switch, and the operation manager A can be urged to investigate the status of the collection of the bills and the mistake. At this time, the operation of the switch (that is, turning on the power source 1) may be locked by the locking means, although it is slightly larger in terms of equipment.

  As described above, according to the present invention, for example, in maintenance work of a large-scale plant, it is possible to electronically specify a switch to be shut off while having a relatively simple system configuration, and at the end of the maintenance work, It is possible to provide a system 100 capable of electronically confirming the collection of a permit and preventing an erroneous input of a power source. In addition, according to the present invention, the system 100 can be used to electronically identify a switch to be cut off, and at the end of maintenance work, electronic confirmation of each worker's work permit collection can be made and the power source can be erroneously turned on. It is possible to provide a method capable of preventing the problem.

  Next, another aspect and a suitable aspect are demonstrated. In the above description, a mode in which only one power source 1 (or a switch of the power source 1) is provided has been described. For example, a plurality of power sources 1a, 1b,. In many cases, maintenance work is performed after shutting down (in such a case, a person in charge of operating a power source may be in charge of operating a power source for a plurality of maintenance work in parallel). In this case, the system as described above is used for all the power sources 1a, 1b,. That is, a system similar to the system 100 is constructed for each power source, and erroneous operation of each power source is prevented. For example, a parent tag (a00) is linked to a switch a of a power source 1 and a parent tag (b00) is linked to a switch b of another power source. By using an instruction system, database, etc. that are hierarchized, it is possible to prevent erroneous operation of each power source 1a, 1b,. In such a system, for example, in the first hierarchy, one or more power source operation managers operate one or more power sources 1a, 1b,. .. Are used as many as the number of power sources (or switches) in the instruction systems 5a, 5b,. Are linked to the power source (parent tag) related to the work among the sub-tags associated with the parent tags (a00), (b00),... Displayed on the power sources 1a, 1b,. What is necessary is to work while holding one or more sub-tags. Then, after the work is completed, the worker may return the held tag to each person in charge on the upstream side so as to be linked to the power source (parent tag) related to his / her work. Then, each power source operating person in charge of the power sources 1a, 1b,... Confirms that all of the power tags 1a, 1b,. 1b,... Can be turned on.

  Further, in the example of FIG. 2, the hierarchy is described in terms of three levels: parent (tag) -child (tag) -grandchild (tag) (first to third recording means 11, 12, 13). It can be understood in the same way even if increases. It is also possible to have two levels of parent-child. That is, the hierarchy relating to the instruction system 5 provided in the system 100 may be at least n (n is an integer of 2 or more), the power source 1 is operated in the first hierarchy, and the first recording means is In the following, a system in which the work on the downstream side of the (n-1) th layer is performed in the nth layer, and the nth recording unit is provided as the lower layer side recording unit.

  The recording unit (label, tag) in which the identification information of the switch and each tag is recorded may be a QR code in addition to the above bar code. However, it is preferable to avoid the switch information recording unit 10 that transmits radio waves such as an RFID tag. In an actual embodiment, for example, the switches A, A ′, A ″ of a plurality of power sources are often provided on one operation panel (distribution panel). In such a case, when an RFID tag is used, there is a risk of erroneously recognizing information on a nearby switch (or a parent tag displayed thereon).

  Hereinafter, based on an Example, this invention is explained in full detail. In the example, reading using a terminal was compared with reading using a barcode and reading using an RFID.

  Material: Bar code (0.8 × 5 cm) related to identification information or RFID (5.5 × 8.5 cm) related to identification information on the surface of a tag (6.5 × 16 cm, thickness 2 mm) made of acrylic resin Affixed (hereinafter, a tag with a barcode or RFID attached may be referred to as a “tag”), and a plurality of evaluation tags were produced. As a terminal for reading each tag, a portable RFID reader URP-SJ110 manufactured by Samsung was used.

1. Directivity As shown in FIG. 4, a plurality of produced tags were mounted side by side on a wall surface. The distance between the tags was the horizontal distance Y, and the distance between the terminal and the tag was the vertical distance X. At the time of evaluation, as shown in FIG. 4, the tag was read with one tag facing the center of the reading surface of the terminal. Specifically, when three tags with barcodes are arranged and read at each terminal, the reading accuracy and three tags with RFID tags are arranged and read at each terminal. In this case, the reading accuracy was compared. Then, the influence of the diffraction / diffusion function of RFID on reading was examined and compared with a barcode. The results are shown in Tables 1-4. Table 1 shows the results when the barcode is used, and Tables 2 to 4 show the results when the RFID is used. Tables 2 to 4 were evaluated in the same manner except that the radio wave intensity of the terminal was changed (Table 2: Radio wave intensity 1 dB, Table 3: Radio wave intensity 10 dB, Table 4: Radio wave intensity 15 dB). . Each evaluation concerning (circle), (triangle | delta), and x in a table | surface means the following.
○: When reading without interference (that is, when only one tag can be read)
△: When reading with interference (that is, when reading multiple tags)
N: When reading failed

  As is clear from the results, when RFID is used, individual tags cannot be identified when the tag interval (horizontal distance Y) is reduced to several centimeters. Moreover, even if it can be identified, even adjacent tags are read due to slight fluctuations in the operation of the terminal. On the other hand, when a bar code is used, even if the tag interval is set to 0, adjacent tags are not erroneously read.

2. Material A barcode or RFID was directly pasted on a metal control panel, and a reading test was performed on each using a terminal. As a result, when RFID is used when pasting on a metal control panel, radio waves are absorbed (shielded) by the metal and cannot be read unless the radio wave output is increased. On the other hand, since the barcode reads the reflected light of the laser, it can be read appropriately regardless of the material to be attached.

3. Usability When RFID is used, it is impossible to visually confirm which tag the terminal is reading when it is read by the terminal. On the other hand, when a barcode is used, since the red laser light emitted from the terminal is applied to the barcode and read, it is possible to easily confirm on the appearance which barcode is being read.

  From the above, when a plurality of switches are adjacent to each other, thereby providing a tag for each switch adjacent to each other, it is preferable to use a barcode as a tag so that each tag can be individually read. I found out that

  INDUSTRIAL APPLICABILITY The present invention can be used when performing maintenance work on a plant such as a steelmaking facility, and prevents a power source switch from being erroneously operated with a relatively simple configuration, and a plurality of facilities related to facilities within a power source supply range. Work can be done.

DESCRIPTION OF SYMBOLS 1 Power source 5 Instruction system 10 Switch information recording part 11 1st recording means (parent card)
12 Second recording means (child tag)
13 Third recording means (Suntag)
20 Terminal 30 Verification means 40 Database recording means 50 Database 100 System

Claims (4)

A power source is shut off and turned on at the first level, and at least an n-level indication system is provided to perform work downstream of the power source at the nth level (n is an integer of 2 or more),
A system for preventing erroneous shut-off / injection of the power source in the first hierarchy of the instruction system,
A switch information recording unit in which identification information of the switch of the power source is recorded in a bar code or a QR code;
A first recording means provided in the first hierarchy, functioning as a prohibiting means of the power source, and having a recording unit in which identification information of the power source is recorded in a barcode or a QR code;
A lower layer side recording means provided for each of the second to nth layers, including a recording unit in which identification information of the player is recorded by a barcode or a QR code;
A database in which the identification information of the switch information recording unit, the first recording unit, and the lower layer side recording unit is associated with the hierarchy;
A terminal capable of inputting the identification information of the switch information recording unit, the first recording unit, and the lower layer side recording unit;
Collating means for collating the identification information input to the terminal with the database;
Database recording means for recording collation data into the database based on the collation by the collation means;
Having a system.   The system according to claim 1, further comprising: a lock unit that locks input of the power source based on the collation data recorded in the database by the database recording unit.   3. The system according to claim 1, wherein a plurality of the power source or a switch of the power source exists, and the instruction system is provided for each power source or for each switch of the power source.   A method for preventing erroneous operation of a power source using the system according to claim 1.