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JP7599687B2 - Approach Warning System - Google Patents

Approach Warning System Download PDF

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JP7599687B2
JP7599687B2 JP2020179946A JP2020179946A JP7599687B2 JP 7599687 B2 JP7599687 B2 JP 7599687B2 JP 2020179946 A JP2020179946 A JP 2020179946A JP 2020179946 A JP2020179946 A JP 2020179946A JP 7599687 B2 JP7599687 B2 JP 7599687B2
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信也 原野
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YOSHIKAWAKOGYO CO.,LTD.
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Description

本発明は、重機の運転席又はその近傍に設置された距離検知制御装置と、作業者に取り付けられた磁界検知機能付きＲＦＩＤタグとの接近を検知して接近警報を出力する接近警報システムに関する。 The present invention relates to a proximity warning system that detects the approach of a distance detection control device installed in or near the driver's seat of heavy machinery and an RFID tag with a magnetic field detection function attached to a worker, and outputs a proximity warning.

かかる重機周りの接近警報システムにおいては、当該重機の運転席にいる作業者（重機運転者）が磁界検知機能付きＲＦＩＤタグを所持している場合、当該作業者（重機運転者）に対して不要な接近警報が出力されることになる。そのため、重機の運転席にいる作業者（重機運転者）に対して接近警報が出力されないようにするための仕組みが必要となる。 In such a heavy machinery proximity warning system, if a worker (heavy machinery operator) in the driver's seat of the heavy machinery carries an RFID tag with a magnetic field detection function, an unnecessary proximity warning will be output to the worker (heavy machinery operator). Therefore, a mechanism is required to prevent the output of a proximity warning to the worker (heavy machinery operator) in the driver's seat of the heavy machinery.

そこで、例えば特許文献１では、作業現場内の重機に当該重機周囲の近接危険域を覆う強度で重機固有ＩＤをトリガーＩＤとして送出する第１発信器と当該重機の運転席範囲を覆う強度で運転席固有ＩＤをトリガーＩＤとして送出する第２発信器とを設置することにより、重機の運転席にいる作業者（重機運転者）に対して接近警報が出力されないようにすることが提案されている。
また、特許文献２では、重機のオペレータが位置するシートの周囲において、エリア信号磁界をキャンセルするキャンセル信号磁界を生成するキャンセルユニットを重機に搭載することにより、重機の運転席にいる作業者（オペレータ）に対して接近警報が出力されないようにすることが提案されている。 Therefore, for example, Patent Document 1 proposes installing a first transmitter on heavy equipment at a work site that transmits a heavy equipment unique ID as a trigger ID at an intensity that covers the proximity danger zone around the heavy equipment, and a second transmitter that transmits a driver's seat unique ID as a trigger ID at an intensity that covers the driver's seat area of the heavy equipment, thereby preventing an approach warning from being output to a worker (heavy equipment operator) in the driver's seat of the heavy equipment.
In addition, Patent Document 2 proposes installing a cancellation unit in heavy equipment that generates a cancellation signal magnetic field that cancels the area signal magnetic field around the seat in which the operator of the heavy equipment is positioned, thereby preventing an approach warning from being output to the worker (operator) in the driver's seat of the heavy equipment.

このように従来技術では、重機の運転席にいる作業者（重機運転者）に対して接近警報が出力されないようにするために、重機周りに接近した作業者に対して接近警報が出力されるようにするための装置（特許文献１では第１発信器、特許文献２ではエリア信号磁界発生ユニット）に加えて、別途新たな装置（特許文献１では第２発信器、特許文献２ではキャンセルユニット）を重機に設置する必要があり、その分、システム構成が複雑となりコストも高くなる。 Thus, in the conventional technology, in order to prevent a proximity warning from being output to a worker in the driver's seat of the heavy equipment (heavy equipment operator), in addition to the device that outputs a proximity warning to workers approaching the heavy equipment (a first transmitter in Patent Document 1, and an area signal magnetic field generating unit in Patent Document 2), a new separate device (a second transmitter in Patent Document 1, and a cancellation unit in Patent Document 2) must be installed on the heavy equipment, which makes the system configuration more complex and increases costs.

特開２０１６－１１５０３８号公報JP 2016-115038 A 特開２０２０－６１０７５号公報JP 2020-61075 A

本発明が解決しようとする課題は、重機周りの接近警報システムにおいて、新たな装置を追加することなく、当該重機の運転席にいる作業者（重機運転者）に対して接近警報が出力されないようにすることにある。 The problem that this invention aims to solve is to prevent a proximity warning from being output to a worker (heavy equipment operator) in the driver's seat of heavy equipment in an approach warning system around the heavy equipment without adding any new equipment.

本発明の一観点によれば、次の接近警報システムが提供される。
重機の運転席又はその近傍に設置された距離検知制御装置と、作業者に取り付けられた磁界検知機能付きＲＦＩＤタグとの接近を検知して接近警報を出力する接近警報システムであって、
前記距離検知制御装置は、誘導磁界を送信する磁界送信部と、電波受信部と、前記接近警報を出力する装置警報部と、これらを制御する装置制御部とを備え、
前記磁界検知機能付きＲＦＩＤタグは、前記磁界送信部から送信される誘導磁界を検知する磁界センサ部と、当該磁界センサ部が前記誘導磁界を検知したときに磁界検知電波を送信する電波送信部と、前記接近警報を出力するタグ警報部と、これらを制御するタグ制御部とを備え、
前記タグ制御部は、前記磁界センサ部が検知した前記誘導磁界の強さが所定の閾値以上の場合、前記タグ警報部から前記接近警報を出力させないと共に、前記電波送信部から前記磁界検知電波を送信させない、接近警報システム。 According to one aspect of the present invention, there is provided a proximity warning system comprising:
A proximity warning system that detects the approach of a distance detection control device installed in or near a driver's seat of a heavy machine and an RFID tag with a magnetic field detection function attached to a worker and outputs a proximity warning,
The distance detection control device includes a magnetic field transmission unit that transmits an induction magnetic field, a radio wave reception unit, an apparatus alarm unit that outputs the approach alarm, and an apparatus control unit that controls these units;
The RFID tag with magnetic field detection function includes a magnetic field sensor unit that detects the induced magnetic field transmitted from the magnetic field transmission unit, a radio wave transmission unit that transmits a magnetic field detection radio wave when the magnetic field sensor unit detects the induced magnetic field, a tag alarm unit that outputs the approach alarm, and a tag control unit that controls these units;
A proximity warning system in which the tag control unit does not cause the tag alarm unit to output the proximity warning and does not cause the radio wave transmission unit to transmit the magnetic field detection radio waves when the strength of the induced magnetic field detected by the magnetic field sensor unit is equal to or greater than a predetermined threshold value.

本発明の他の観点によれば、次の接近警報システムが提供される。
重機の運転席又はその近傍に設置された距離検知制御装置と、作業者に取り付けられた磁界検知機能付きＲＦＩＤタグとの接近を検知して接近警報を出力する接近警報システムであって、
前記距離検知制御装置は、当該距離検知制御装置の装置ＩＤ情報を含む誘導磁界を送信する磁界送信部と、電波受信部と、前記接近警報を出力する装置警報部と、これらを制御する装置制御部とを備え、
前記磁界検知機能付きＲＦＩＤタグは、前記磁界送信部から送信される誘導磁界を検知する磁界センサ部と、当該磁界センサ部が前記誘導磁界を検知したときに当該磁界検知機能付きＲＦＩＤタグのタグＩＤ情報及び前記装置ＩＤ情報を含む磁界検知電波を送信する電波送信部と、前記接近警報を出力するタグ警報部と、これらを制御するタグ制御部とを備え、
前記タグ制御部は、前記磁界センサ部が検知した前記誘導磁界の強さが所定の閾値以上の場合、前記タグ警報部から前記接近警報を出力させないと共に、前記電波送信部から出力される前記磁界検知電波に、前記装置警報部が前記接近警報を出力しないようにするための警報不出力情報を付加する、接近警報システム。 According to another aspect of the present invention, there is provided a proximity warning system comprising:
A proximity warning system that detects the approach of a distance detection control device installed in or near a driver's seat of a heavy machine and an RFID tag with a magnetic field detection function attached to a worker and outputs a proximity warning,
The distance detection control device includes a magnetic field transmission unit that transmits an induction magnetic field including device ID information of the distance detection control device, a radio wave receiving unit, a device alarm unit that outputs the approach alarm, and a device control unit that controls these units;
The RFID tag with a magnetic field detection function includes a magnetic field sensor unit that detects an induced magnetic field transmitted from the magnetic field transmission unit, a radio wave transmission unit that transmits a magnetic field detection radio wave including tag ID information of the RFID tag with a magnetic field detection function and the device ID information when the magnetic field sensor unit detects the induced magnetic field, a tag alarm unit that outputs the approach alarm, and a tag control unit that controls these units.
A proximity warning system in which, when the strength of the induced magnetic field detected by the magnetic field sensor unit is equal to or greater than a predetermined threshold, the tag control unit does not cause the tag warning unit to output the proximity warning, and adds warning non-output information to the magnetic field detection radio waves output from the radio wave transmitting unit to prevent the device warning unit from outputting the proximity warning.

本発明によれば、重機周りの接近警報システムにおいて、新たな装置を追加することなく、当該重機の運転席にいる作業者（重機運転者）に対して接近警報が出力されないようにすることができる。 According to the present invention, in a proximity warning system for heavy machinery, it is possible to prevent a proximity warning from being output to a worker (heavy machinery operator) in the driver's seat of the heavy machinery without adding any new equipment.

本発明の一実施形態である接近警報システムのシステム構成図。1 is a system configuration diagram of an approach warning system according to an embodiment of the present invention; 図１の接近警報システムにおける距離検知制御装置及び磁界検知機能付きＲＦＩＤタグの構成を示すブロック図。2 is a block diagram showing the configuration of a distance detection control device and an RFID tag with a magnetic field detection function in the approach warning system of FIG. 1 .

図１に、本発明の一実施形態である接近警報システムのシステム構成を示し、図２に、この接近警報システムにおける距離検知制御装置及び磁界検知機能付きＲＦＩＤタグの構成を示している。なお、以下の説明では、「距離検知制御装置」を単に「検知機」といい、「磁界検知機能付きＲＦＩＤタグ」を単に「タグ」という。 Figure 1 shows the system configuration of a proximity warning system according to one embodiment of the present invention, and Figure 2 shows the configuration of a distance detection control device and an RFID tag with magnetic field detection function in this proximity warning system. In the following description, the "distance detection control device" will be referred to simply as the "detector," and the "RFID tag with magnetic field detection function" will be referred to simply as the "tag."

図１に概念的に示しているように、この接近警報システムでは、重機１（本実施形態ではフォークリフト）の運転席の近傍である天井部に検知機２が設置され、各作業者３ａ，３ｂにそれぞれタグ４ａ，４ｂが取り付けられている。なお図１では、作業者３ａが重機１の運転席におり、作業者３ｂが重機１に接近している様子を示している。 As conceptually shown in Figure 1, in this approach warning system, a detector 2 is installed on the ceiling near the driver's seat of heavy equipment 1 (a forklift in this embodiment), and tags 4a and 4b are attached to each of workers 3a and 3b. Note that Figure 1 shows worker 3a in the driver's seat of heavy equipment 1, and worker 3b approaching heavy equipment 1.

図２に示すように検知機２は、誘導磁界を送信する磁界送信部と、電波受信部と、接近警報を出力する装置警報部と、これらを制御する装置制御部とを備える共に、外部電源を検知機２の稼動に適した直流電圧（１２Ｖ）に変換する電圧変換部を備える。
また、タグ４ａ，４ｂの構成は共通であり、それぞれ検知機２の磁界送信部から送信される誘導磁界を検知する磁界センサ部と、当該磁界センサ部が誘導磁界を検知したときに磁界検知電波を送信する電波送信部と、接近警報を出力するタグ警報部と、これらを制御するタグ制御部とを備えると共に、外部電源を検知機Ａ，Ｂ，Ｃの稼動に適した直流電圧（１２Ｖ）に変換する電圧変換部を備えると共に、電源としてバッテリを備える。 As shown in Figure 2, the detector 2 comprises a magnetic field transmitting unit that transmits an induced magnetic field, a radio wave receiving unit, an equipment alarm unit that outputs a proximity alarm, and an equipment control unit that controls these, as well as a voltage conversion unit that converts an external power source into a DC voltage (12 V) suitable for operating the detector 2.
In addition, the tags 4a, 4b have a common configuration, and each comprises a magnetic field sensor unit that detects the induced magnetic field transmitted from the magnetic field transmission unit of the detector 2, a radio wave transmission unit that transmits a magnetic field detection radio wave when the magnetic field sensor unit detects the induced magnetic field, a tag alarm unit that outputs a proximity alarm, and a tag control unit that controls these, as well as a voltage conversion unit that converts an external power source into a DC voltage (12 V) suitable for operating the detectors A, B, and C, and a battery as a power source.

図１において検知機２は、その磁界送信部から所定の強さの誘導磁界５を送信する。誘導磁界の強さは距離の３乗に反比例して減衰するから、この誘導磁界５の強さは、検知機２近傍の重機１の運転席では強く、重機１の運転席から離れるにつれて弱くなる（図１では、誘導磁界５の検知可能範囲を破線で示している。）。 In Figure 1, the detector 2 transmits an induced magnetic field 5 of a predetermined strength from its magnetic field transmission unit. Since the strength of the induced magnetic field attenuates inversely proportional to the cube of the distance, the strength of this induced magnetic field 5 is strong in the driver's seat of the heavy equipment 1 near the detector 2 and weakens as it moves away from the driver's seat of the heavy equipment 1 (in Figure 1, the detectable range of the induced magnetic field 5 is indicated by a dashed line).

そこで本実施形態の一態様では、タグ制御部は、磁界センサ部が検知した誘導磁界５の強さが所定の閾値以上の場合、そのタグは重機１の運転席内にある、言い換えればそのタグは重機１の運転席にいる作業者３ａに取り付けられているものであると判断し、タグ警報部から接近警報を出力させないと共に、電波送信部から磁界検知電波を送信させない。そうすると、検知機２の装置警報部からも接近警報は出力されない。 Therefore, in one aspect of this embodiment, when the strength of the induced magnetic field 5 detected by the magnetic field sensor unit is equal to or greater than a predetermined threshold value, the tag control unit determines that the tag is in the driver's seat of the heavy equipment 1, in other words, that the tag is attached to the worker 3a who is in the driver's seat of the heavy equipment 1, and does not cause the tag alarm unit to output a proximity alarm, nor does it cause the radio wave transmitter unit to transmit a magnetic field detection radio wave. As a result, no proximity alarm is output from the device alarm unit of the detector 2.

前述の閾値は、重機１の運転席で検知される誘導磁界５の強さ（値）を基準として、この基準値以下とする。詳しくは前述の閾値は、実質的にタグが重機１の運転席内にあるときだけ、そのタグで検知される誘導磁界５の強さ（値）が当該閾値以上となるように設定することができる。言い換えると前述の閾値は、重機１に接近した作業者３ｂに取り付けられているタグ４ｂが検知する誘導磁界の強さ（値）よりも大きい値に設定することができる。そうすると、重機１に接近した作業者３ｂに取り付けられているタグ４ｂが検知する誘導磁界の強さは前述の閾値以上にはならないので、タグ４ｂのタグ制御部は通常通り、タグ警報部から接近警報を出力させると共に、電波送信部から磁界検知電波を送信させる。そうすると、検知機２の装置警報部からも接近警報が出力される。
なお、図１では誘導磁界５の強さが所定の閾値以上となる領域を一点鎖線で囲んでいる。 The aforementioned threshold value is set to a reference value or less based on the strength (value) of the induced magnetic field 5 detected in the driver's seat of the heavy equipment 1. In detail, the aforementioned threshold value can be set so that the strength (value) of the induced magnetic field 5 detected by the tag is equal to or greater than the threshold value only when the tag is substantially in the driver's seat of the heavy equipment 1. In other words, the aforementioned threshold value can be set to a value greater than the strength (value) of the induced magnetic field detected by the tag 4b attached to the worker 3b approaching the heavy equipment 1. In this case, the strength of the induced magnetic field detected by the tag 4b attached to the worker 3b approaching the heavy equipment 1 does not exceed the aforementioned threshold value, so that the tag control unit of the tag 4b outputs an approach warning from the tag warning unit as usual, and transmits a magnetic field detection radio wave from the radio wave transmission unit. Then, an approach warning is also output from the device warning unit of the detector 2.
In FIG. 1, a region where the strength of the induced magnetic field 5 is equal to or greater than a predetermined threshold value is surrounded by a dashed line.

前述の閾値は、予めタグ制御部に記憶させておくこともできるが、検知機２から発信する誘導磁界の強さや重機１の運転席の大きさ等に応じて適宜変更できるように、検知機２の装置制御部は、その磁界送信部から送信される誘導磁界に前述の閾値の情報を付加することもできる。この場合、検知機２の装置制御部は前述の閾値を変更できるようにすることもできる。具体的には検知機２の装置制御部は、磁界送信部から送信される誘導磁界の強さに応じ前述の閾値を変更することもできる。より具体的には検知機２の装置制御部は、磁界送信部から送信される誘導磁界の強さが高いほど、前述の閾値を大きくすることもできる。 The aforementioned threshold value can be stored in the tag control unit in advance, but the device control unit of the detector 2 can also add information about the aforementioned threshold value to the induced magnetic field transmitted from its magnetic field transmission unit so that it can be changed appropriately depending on the strength of the induced magnetic field emitted from the detector 2 and the size of the driver's seat of the heavy equipment 1, etc. In this case, the device control unit of the detector 2 can also make the aforementioned threshold value changeable. Specifically, the device control unit of the detector 2 can also change the aforementioned threshold value depending on the strength of the induced magnetic field transmitted from the magnetic field transmission unit. More specifically, the device control unit of the detector 2 can increase the aforementioned threshold value the higher the strength of the induced magnetic field transmitted from the magnetic field transmission unit.

本実施形態の他の態様では、検知機２の磁界送信部は当該検知機２の装置ＩＤ情報を含む誘導磁界５を送信する。また、タグ４ａ，４ｂの電波送信部は、その磁界センサ部が誘導磁界５を検知したときに当該タグ４ａ，４ｂのタグＩＤ情報及び検知機２の装置ＩＤ情報を含む磁界検知電波を送信する。そして、タグ４ａ，４ｂのタグ制御部は、磁界センサ部が検知した誘導磁界５の強さが所定の閾値以上の場合、タグ警報部から接近警報を出力させないと共に、電波送信部から出力される磁界検知電波に、検知機２の装置警報部が接近警報を出力しないようにするための警報不出力情報を付加する。そうすると、検知機２の装置警報部からも接近警報は出力されない。 In another aspect of this embodiment, the magnetic field transmission unit of the detector 2 transmits an induced magnetic field 5 including device ID information of the detector 2. Furthermore, the radio wave transmission units of the tags 4a, 4b transmit magnetic field detection radio waves including the tag ID information of the tags 4a, 4b and the device ID information of the detector 2 when the magnetic field sensor unit detects the induced magnetic field 5. Then, when the strength of the induced magnetic field 5 detected by the magnetic field sensor unit is equal to or greater than a predetermined threshold, the tag control unit of the tags 4a, 4b does not output a proximity alarm from the tag alarm unit, and adds alarm non-output information to the magnetic field detection radio waves output from the radio wave transmission unit so that the device alarm unit of the detector 2 does not output a proximity alarm. In this way, no proximity alarm is output from the device alarm unit of the detector 2.

この態様において、検知機２の装置制御部は、電波受信部が前述の警報不出力情報を含む磁界検知電波を受信したとしても、所定時間内（例えば概ね１～３秒以内）に異なるタグＩＤ情報を含む磁界検知電波を受信した場合、装置警報部から接近警報を出力させるようにすることができる。例えば図１では、重機１の運転席にいる作業者３ａに取り付けられているタグ４ａの電波送信部から、タグ４ａのタグＩＤ情報及び検知機２の装置ＩＤ情報と共に警報不出力情報を含む磁界検知電波が送信され、その磁界検知電波を検知機２の電波受信部が受信する。一方、重機１に接近した作業者３ｂに取り付けられているタグ４ｂの電波送信部からは、タグ４ｂのタグＩＤ情報及び検知機２の装置ＩＤ情報を含む磁界検知電波が送信され、その磁界検知電波を検知機２の電波受信部が受信する。このように、検知機２の装置制御部は、電波受信部がタグ４ａのタグＩＤ情報及び検知機２の装置ＩＤ情報と共に警報不出力情報を含む磁界検知電波を受信したとしても、所定時間内に異なるタグＩＤ情報であるタグ４ｂのタグＩＤ情報及び検知機２の装置ＩＤ情報を含む磁界検知電波を受信した場合、装置警報部から接近警報を出力させるようにすることができる。この場合、装置警報部から出力される接近警報は、重機１の運転席にいる作業者３ａ以外の作業者３ｂが重機１に接近したことを示すもので、この接近警報により重機１の運転席にいる作業者３ａは、他の作業者３ｂが重機１に接近していることを知ることができる。また、重機１に接近した作業者３ｂは、自らのタグ４ｂのタグ警報部から接近警報が出力されるので、これにより自身が重機１に接近していることを知ることができる。 In this embodiment, even if the radio wave receiving unit receives a magnetic field detection radio wave including the above-mentioned alarm non-output information, if the device control unit of the detector 2 receives a magnetic field detection radio wave including different tag ID information within a predetermined time (e.g., within approximately 1 to 3 seconds), the device control unit can cause the device alarm unit to output a proximity alarm. For example, in FIG. 1, a magnetic field detection radio wave including alarm non-output information is transmitted from the radio wave transmitting unit of the tag 4a attached to the worker 3a in the driver's seat of the heavy equipment 1 along with the tag ID information of the tag 4a and the device ID information of the detector 2, and the magnetic field detection radio wave is received by the radio wave receiving unit of the detector 2. Meanwhile, a magnetic field detection radio wave including the tag ID information of the tag 4b and the device ID information of the detector 2 is transmitted from the radio wave transmitting unit of the tag 4b attached to the worker 3b who has approached the heavy equipment 1, and the magnetic field detection radio wave is received by the radio wave receiving unit of the detector 2. In this way, even if the radio wave receiver receives magnetic field detection radio waves including the tag ID information of tag 4a and the device ID information of detector 2 as well as alarm non-output information, if the device control unit of detector 2 receives magnetic field detection radio waves including different tag ID information, that is, the tag ID information of tag 4b and the device ID information of detector 2 within a predetermined time, the device control unit can output an approach alarm from the device alarm unit. In this case, the approach alarm output from the device alarm unit indicates that a worker 3b other than worker 3a in the driver's seat of heavy equipment 1 has approached heavy equipment 1, and this approach alarm allows worker 3a in the driver's seat of heavy equipment 1 to know that the other worker 3b is approaching heavy equipment 1. In addition, worker 3b who has approached heavy equipment 1 can know that he or she is approaching heavy equipment 1 because an approach alarm is output from the tag alarm unit of his or her own tag 4b.

図１では、作業者３ｂは誘導磁界５の強さが所定の閾値以上となる領域（一点鎖線で囲んだ領域）外にいるが、作業者３ｂが誘導磁界５の強さが所定の閾値以上となる領域内にいる場合、次のような動作となる。すなわち、重機１の運転席にいる作業者３ａに取り付けられているタグ４ａの電波送信部からは、タグ４ａのタグＩＤ情報及び検知機２の装置ＩＤ情報と共に警報不出力情報を含む磁界検知電波が送信され、その磁界検知電波を検知機２の電波受信部が受信する。また、誘導磁界５の強さが所定の閾値以上となる領域内にいる作業者３ｂに取り付けられているタグ４ｂの電波送信部からは、タグ４ｂのタグＩＤ情報及び検知機２の装置ＩＤ情報と共に警報不出力情報を含む磁界検知電波が送信され、その磁界検知電波を検知機２の電波受信部が受信する。このように、検知機２の装置制御部は、電波受信部がタグ４ａのタグＩＤ情報及び検知機２の装置ＩＤ情報と共に警報不出力情報を含む磁界検知電波を受信したとしても、所定時間内に異なるタグＩＤ情報であるタグ４ｂのタグＩＤ情報及び検知機２の装置ＩＤ情報と共に警報不出力情報を含む磁界検知電波を受信した場合、装置警報部から接近警報を出力させるようにすることができる。この場合、装置警報部から出力される接近警報は、重機１の運転席にいる作業者３ａ以外の作業者３ｂが重機１に接近したことを示すもので、この接近警報により重機１の運転席にいる作業者３ａは、他の作業者３ｂが重機１に接近していることを知ることができる。なお、この場合、タグ４ａ及びタグ４ｂのそれぞれのタグ警報部からは接近警報は出力されない。 1, the worker 3b is outside the area (area surrounded by a dashed line) where the strength of the induced magnetic field 5 is equal to or greater than a predetermined threshold, but when the worker 3b is within the area where the strength of the induced magnetic field 5 is equal to or greater than a predetermined threshold, the following operation is performed. That is, a magnetic field detection radio wave including the tag ID information of the tag 4a and the device ID information of the detector 2 as well as the alarm non-output information is transmitted from the radio wave transmitting unit of the tag 4a attached to the worker 3a in the driver's seat of the heavy equipment 1, and the magnetic field detection radio wave is received by the radio wave receiving unit of the detector 2. Also, a magnetic field detection radio wave including the tag ID information of the tag 4b and the device ID information of the detector 2 as well as the alarm non-output information is transmitted from the radio wave transmitting unit of the tag 4b attached to the worker 3b in the area where the strength of the induced magnetic field 5 is equal to or greater than a predetermined threshold, and the magnetic field detection radio wave is received by the radio wave receiving unit of the detector 2. In this way, even if the radio wave receiving unit receives magnetic field detection radio waves including alarm non-output information together with the tag ID information of tag 4a and the device ID information of detector 2, the device control unit of detector 2 can output a proximity alarm from the device alarm unit when it receives magnetic field detection radio waves including alarm non-output information together with the tag ID information of tag 4b, which is different tag ID information, and the device ID information of detector 2 within a predetermined time. In this case, the proximity alarm output from the device alarm unit indicates that a worker 3b other than worker 3a in the driver's seat of heavy equipment 1 has approached heavy equipment 1, and this proximity alarm allows worker 3a in the driver's seat of heavy equipment 1 to know that the other worker 3b is approaching heavy equipment 1. In this case, no proximity alarm is output from the tag alarm units of tags 4a and 4b.

この態様において、検知機２は、電波受信部が受信した磁界検知電波に含まれる情報を有線又は無線にてサーバーへ送信する情報送信部をさらに備えることができる。これにより、重機１への作業者３ｂ等の接近情報を総括的に管理することができる。なお、図１では、２人の作業者を示したが、作業者の人数は１人の場合や、３人以上の場合もある。 In this embodiment, the detector 2 can further include an information transmission unit that transmits information contained in the magnetic field detection radio waves received by the radio wave receiving unit to a server via wired or wireless communication. This allows for comprehensive management of information on the approach of workers 3b and the like to the heavy equipment 1. Note that while two workers are shown in FIG. 1, the number of workers may be one or three or more.

以上の通り本実施形態によれば、重機周りに接近した作業者に対して接近警報が出力されるようにするための装置（検知機２）のほかに、別途新たな装置を追加することなく、当該重機の運転席にいる作業者（重機運転者）に対して接近警報が出力されないようにすることができる。 As described above, according to this embodiment, in addition to the device (detector 2) for outputting a proximity warning to a worker approaching the heavy machinery, it is possible to prevent a proximity warning from being output to a worker (heavy machinery operator) in the driver's seat of the heavy machinery without adding any additional device.

１ 重機
２ 検知機（距離検知制御装置）
３ａ，３ｂ 作業者
４ａ，４ｂ タグ（磁界検知機能付きＲＦＩＤタグ）
５ 誘導磁界 1 Heavy machinery 2 Detector (distance detection control device)
3a, 3b Worker 4a, 4b Tag (RFID tag with magnetic field detection function)
5. Induction magnetic field

Claims (7)

重機の運転席又はその近傍に設置された距離検知制御装置と、作業者に取り付けられた磁界検知機能付きＲＦＩＤタグとの接近を検知して接近警報を出力する接近警報システムであって、
前記距離検知制御装置は、誘導磁界を送信する磁界送信部と、電波受信部と、前記接近警報を出力する装置警報部と、これらを制御する装置制御部とを備え、
前記磁界検知機能付きＲＦＩＤタグは、前記磁界送信部から送信される誘導磁界を検知する磁界センサ部と、当該磁界センサ部が前記誘導磁界を検知したときに磁界検知電波を送信する電波送信部と、前記接近警報を出力するタグ警報部と、これらを制御するタグ制御部とを備え、
前記タグ制御部は、前記磁界センサ部が検知した前記誘導磁界の強さが所定の閾値以上の場合、前記タグ警報部から前記接近警報を出力させないと共に、前記電波送信部から前記磁界検知電波を送信させない、接近警報システム。 A proximity warning system that detects the approach of a distance detection control device installed in or near a driver's seat of a heavy machine and an RFID tag with a magnetic field detection function attached to a worker and outputs a proximity warning,
The distance detection control device includes a magnetic field transmission unit that transmits an induction magnetic field, a radio wave reception unit, an apparatus alarm unit that outputs the approach alarm, and an apparatus control unit that controls these units;
The RFID tag with magnetic field detection function includes a magnetic field sensor unit that detects the induced magnetic field transmitted from the magnetic field transmission unit, a radio wave transmission unit that transmits a magnetic field detection radio wave when the magnetic field sensor unit detects the induced magnetic field, a tag alarm unit that outputs the approach alarm, and a tag control unit that controls these units;
A proximity warning system in which the tag control unit does not cause the tag alarm unit to output the proximity warning and does not cause the radio wave transmission unit to transmit the magnetic field detection radio waves when the strength of the induced magnetic field detected by the magnetic field sensor unit is equal to or greater than a predetermined threshold value. 重機の運転席又はその近傍に設置された距離検知制御装置と、作業者に取り付けられた磁界検知機能付きＲＦＩＤタグとの接近を検知して接近警報を出力する接近警報システムであって、
前記距離検知制御装置は、当該距離検知制御装置の装置ＩＤ情報を含む誘導磁界を送信する磁界送信部と、電波受信部と、前記接近警報を出力する装置警報部と、これらを制御する装置制御部とを備え、
前記磁界検知機能付きＲＦＩＤタグは、前記磁界送信部から送信される誘導磁界を検知する磁界センサ部と、当該磁界センサ部が前記誘導磁界を検知したときに当該磁界検知機能付きＲＦＩＤタグのタグＩＤ情報及び前記装置ＩＤ情報を含む磁界検知電波を送信する電波送信部と、前記接近警報を出力するタグ警報部と、これらを制御するタグ制御部とを備え、
前記タグ制御部は、前記磁界センサ部が検知した前記誘導磁界の強さが所定の閾値以上の場合、前記タグ警報部から前記接近警報を出力させないと共に、前記電波送信部から出力される前記磁界検知電波に、前記装置警報部が前記接近警報を出力しないようにするための警報不出力情報を付加する、接近警報システム。 A proximity warning system that detects the approach of a distance detection control device installed in or near a driver's seat of a heavy machine and an RFID tag with a magnetic field detection function attached to a worker and outputs a proximity warning,
The distance detection control device includes a magnetic field transmission unit that transmits an induction magnetic field including device ID information of the distance detection control device, a radio wave receiving unit, a device alarm unit that outputs the approach alarm, and a device control unit that controls these units;
The RFID tag with a magnetic field detection function includes a magnetic field sensor unit that detects an induced magnetic field transmitted from the magnetic field transmission unit, a radio wave transmission unit that transmits a magnetic field detection radio wave including tag ID information of the RFID tag with a magnetic field detection function and the device ID information when the magnetic field sensor unit detects the induced magnetic field, a tag alarm unit that outputs the approach alarm, and a tag control unit that controls these units.
A proximity warning system in which, when the strength of the induced magnetic field detected by the magnetic field sensor unit is equal to or greater than a predetermined threshold, the tag control unit does not cause the tag warning unit to output the proximity warning, and adds warning non-output information to the magnetic field detection radio waves output from the radio wave transmitting unit to prevent the device warning unit from outputting the proximity warning. 前記装置制御部は、前記電波受信部が前記警報不出力情報を含む前記磁界検知電波を受信したとしても、所定時間内に異なるタグＩＤ情報を含む磁界検知電波を受信した場合、前記装置警報部から前記接近警報を出力させる、請求項２に記載の接近警報システム。 The proximity warning system according to claim 2, wherein the device control unit causes the device warning unit to output the proximity warning when the radio wave receiving unit receives the magnetic field detection radio wave including the alarm non-output information within a predetermined time period and receives a magnetic field detection radio wave including different tag ID information. 前記距離検知制御装置は、前記電波受信部が受信した磁界検知電波に含まれる情報を有線又は無線にてサーバーへ送信する情報送信部を備える、請求項２又は３に記載の接近警報システム。 The proximity warning system according to claim 2 or 3, wherein the distance detection control device includes an information transmission unit that transmits information contained in the magnetic field detection radio wave received by the radio wave receiving unit to a server via wired or wireless communication. 前記装置制御部は、前記磁界送信部から送信される誘導磁界に、前記閾値の情報を付加する、請求項１から４のいずれか一項に記載の接近警報システム。 The proximity warning system according to any one of claims 1 to 4, wherein the device control unit adds the threshold value information to the induced magnetic field transmitted from the magnetic field transmission unit. 前記装置制御部は前記閾値を変更できる、請求項５に記載の接近警報システム。 The proximity warning system of claim 5, wherein the device control unit can change the threshold value. 前記装置制御部は、前記磁界送信部から送信される誘導磁界の強さに応じて前記閾値を変更する、請求項６に記載の接近警報システム。 The proximity warning system according to claim 6, wherein the device control unit changes the threshold value according to the strength of the induced magnetic field transmitted from the magnetic field transmission unit.
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