JP2020144016A - Detector and valve - Google Patents

Detector and valve Download PDF

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JP2020144016A
JP2020144016A JP2019041150A JP2019041150A JP2020144016A JP 2020144016 A JP2020144016 A JP 2020144016A JP 2019041150 A JP2019041150 A JP 2019041150A JP 2019041150 A JP2019041150 A JP 2019041150A JP 2020144016 A JP2020144016 A JP 2020144016A
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detection
circuit
proximity switch
threshold value
detector
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JP7267040B2 (en
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田中　雅人
Masahito Tanaka
雅人 田中
信博 喜入
Nobuhiro Kiiri
信博 喜入
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Azbil Corp
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Azbil Corp
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/9512—Proximity switches using a magnetic detector using digital techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Electronic Switches (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

To make it possible to distinguishably detect a plurality of states of a detection body with a single proximity switch.SOLUTION: A detector comprises: a proximity switch 1; and a detection body 2 which has electrical conductivity and which varies a distance between itself and a detection surface of the proximity switch 1 by rotation. The proximity switch 1 comprises: a detection coil 101 which is arranged facing the detection surface in a housing; an oscillation circuit 104 which oscillates to generate a high frequency magnetic field in the detection coil 101; a detection circuit 105 for detecting an amplitude of oscillation by the oscillation circuit 104; a comparison circuit 106 for comparing the amplitude detected by the detection circuit 105 with a plurality of thresholds; an output circuit 107 for outputting a signal which indicates whether or not the amplitude detected by the detection circuit 105 is within a plurality of output ranges formed of the plurality of thresholds, on the basis of the comparison result with the plurality of thresholds by the comparison circuit 106; and a setting input unit 109 for setting the plurality of thresholds for the comparison circuit 106.SELECTED DRAWING: Figure 1

Description

この発明は、近接スイッチを備えた検出装置及びバルブに関する。 The present invention relates to a detection device and a valve including a proximity switch.

従来から、金属等のように導電性を有する検出体の存在又は接近を判定する近接スイッチ（近接センサ）が知られている（例えば特許文献１参照）。近接スイッチは、検出部で、検出体の存在又は接近に伴う検出用コイルのインピーダンス又はＱ値等の変化を検出することで、検出体の存在又は接近を判定する。Ｑ値は、電磁誘導作用によるインダクタンス損失を示す値であり、Ｑ値が高い程損失が小さいことを表す。
また、使用目的によっては、近接スイッチは、検出体と近接スイッチにおける基準点との間の距離を検出する。基準点は、例えば、検出部先端のステンレスカバーのうちの、検出体と向き合う面上の点である。 Conventionally, a proximity switch (proximity sensor) for determining the presence or proximity of a detector having conductivity such as metal has been known (see, for example, Patent Document 1). The proximity switch determines the presence or approach of the detector by detecting a change in the impedance or Q value of the detection coil due to the presence or approach of the detector in the detection unit. The Q value is a value indicating the inductance loss due to the electromagnetic induction action, and the higher the Q value, the smaller the loss.
Also, depending on the intended use, the proximity switch detects the distance between the detector and the reference point on the proximity switch. The reference point is, for example, a point on the surface of the stainless steel cover at the tip of the detection unit facing the detector.

また、金属の種別に応じた閾値を用いることで、特定の金属から構成された検出体に対して判定性能の向上を図った近接スイッチも知られている（例えば特許文献２参照）。なお、この近接スイッチでは、用いる閾値は１つであり、実用時には複数の金属のうちの１種類の金属に対して検出可能としている。 Further, there is also known a proximity switch that improves the determination performance for a detector composed of a specific metal by using a threshold value according to the type of metal (see, for example, Patent Document 2). In this proximity switch, the threshold value used is one, and in practical use, it is possible to detect one type of metal among a plurality of metals.

特開２０１０−２１６８６３号公報Japanese Unexamined Patent Publication No. 2010-216863 特開２０１７−１３０８９７号公報Japanese Unexamined Patent Publication No. 2017-1330897

従来の近接スイッチでは、用いる閾値は１つであるため、検出体の状態を複数区別して検出できない。よって、検出体の状態を複数区別して検出したい場合には、複数の近接スイッチを用いる必要がある。例えば、従来の近接スイッチを用いてボール弁又はバタフライ弁等の弁体の開度を検出したい場合、複数の近接スイッチを用いる必要がある。 Since the conventional proximity switch uses only one threshold value, it is not possible to distinguish and detect a plurality of detector states. Therefore, when it is desired to distinguish and detect a plurality of detector states, it is necessary to use a plurality of proximity switches. For example, when it is desired to detect the opening degree of a valve body such as a ball valve or a butterfly valve by using a conventional proximity switch, it is necessary to use a plurality of proximity switches.

この発明は、上記のような課題を解決するためになされたもので、単一の近接スイッチで、検出体の状態を複数区別して検出可能な検出装置を提供することを目的としている。 The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a detection device capable of distinguishing and detecting a plurality of states of a detector with a single proximity switch.

この発明に係る検出装置は、近接スイッチと、導電性を有し、回転により近接スイッチが有する検出面との間の距離が変わる検出体とを備え、近接スイッチは、筐体内において検出面に対向配置された検出用コイルと、発振して検出用コイルに高周波磁界を発生させる発振回路と、発振回路による発振の振幅を検波する検波回路と、検波回路により検波された振幅を複数の閾値とそれぞれ比較する比較回路と、比較回路による複数の閾値との比較結果に基づいて、検波回路により検波された振幅が当該複数の閾値から構成される複数の出力範囲内であるかを示す信号をそれぞれ出力する出力回路と、比較回路に対する複数の閾値を設定する設定入力部とを有することを特徴とする。 The detection device according to the present invention includes a proximity switch and a detector having conductivity and changing the distance between the detection surface of the proximity switch by rotation, and the proximity switch faces the detection surface in the housing. An arranged detection coil, an oscillation circuit that oscillates to generate a high-frequency magnetic field in the detection coil, a detection circuit that detects the amplitude of oscillation by the oscillation circuit, and a plurality of thresholds for the amplitude detected by the detection circuit, respectively. Based on the comparison result between the comparison circuit to be compared and a plurality of thresholds by the comparison circuit, each output a signal indicating whether the amplitude detected by the detection circuit is within a plurality of output ranges composed of the plurality of thresholds. It is characterized by having an output circuit for oscillating and a setting input unit for setting a plurality of thresholds for a comparison circuit.

この発明によれば、上記のように構成したので、単一の近接スイッチで、検出体の状態を複数区別して検出可能となる。 According to the present invention, since it is configured as described above, it is possible to distinguish and detect a plurality of states of the detector with a single proximity switch.

実施の形態１に係る検出装置の構成例を示す図である。It is a figure which shows the structural example of the detection apparatus which concerns on Embodiment 1. FIG. 実施の形態１における近接スイッチの構成例を示す図である。It is a figure which shows the configuration example of the proximity switch in Embodiment 1. FIG. 実施の形態１に係る検出装置において、出力回路が有する２つの出力端子からの出力と、検出体の向きとの対応関係の一例を示す図である。FIG. 5 is a diagram showing an example of a correspondence relationship between the output from two output terminals of the output circuit and the orientation of the detector in the detection device according to the first embodiment. 図４Ａは、実施の形態１に係る検出装置において、検出体の基準位置が近接スイッチが有する検出面の中心位置（０°）の方向を向いた場合を示す図であり、図４Ｂは図４Ａの場合での近接スイッチによる検出値を示す図である。FIG. 4A is a diagram showing a case where the reference position of the detector faces the direction of the center position (0 °) of the detection surface of the proximity switch in the detection device according to the first embodiment, and FIG. 4B is a diagram showing the case of FIG. 4A. It is a figure which shows the detection value by the proximity switch in the case of. 図５Ａは、実施の形態１に係る検出装置において、検出体の基準位置が近接スイッチが有する検出面の中心位置に対して約３０°の方向を向いた場合を示す図であり、図５Ｂは図５Ａの場合での近接スイッチによる検出値を示す図である。FIG. 5A is a diagram showing a case where the reference position of the detector is oriented at about 30 ° with respect to the center position of the detection surface of the proximity switch in the detection device according to the first embodiment, and FIG. 5B is a diagram. It is a figure which shows the detection value by the proximity switch in the case of FIG. 5A. 図６Ａは、実施の形態１に係る検出装置において、検出体の基準位置が近接スイッチが有する検出面の中心位置に対して約６０°の方向を向いた場合を示す図であり、図６Ｂは図６Ａの場合での近接スイッチによる検出値を示す図である。FIG. 6A is a diagram showing a case where the reference position of the detector is oriented at about 60 ° with respect to the center position of the detection surface of the proximity switch in the detection device according to the first embodiment, and FIG. 6B is a diagram. It is a figure which shows the detection value by the proximity switch in the case of FIG. 6A. 図７Ａは、実施の形態１に係る検出装置において、検出体の基準位置が近接スイッチが有する検出面の中心位置に対して約９０°の方向を向いた場合を示す図であり、図７Ｂは図７Ａの場合での近接スイッチによる検出値を示す図である。FIG. 7A is a diagram showing a case where the reference position of the detector is oriented in a direction of about 90 ° with respect to the center position of the detection surface of the proximity switch in the detection device according to the first embodiment, and FIG. 7B is a diagram. It is a figure which shows the detection value by the proximity switch in the case of FIG. 7A. 実施の形態１における近接スイッチに対する閾値設定を説明するための図である。It is a figure for demonstrating the threshold setting with respect to the proximity switch in Embodiment 1. FIG. 図９Ａ、図９Ｂは実施の形態１における検出体の別の構成例を示す図であり、図９Ａは検出体の基準位置が近接スイッチが有する検出面の中心位置（０°）の方向を向いた場合を示す図であり、図９Ｂは検出体の基準位置が近接スイッチが有する検出面の中心位置に対して約９０°の方向を向いた場合を示す図である。9A and 9B are views showing another configuration example of the detector according to the first embodiment, and FIG. 9A shows the reference position of the detector oriented in the direction of the center position (0 °) of the detection surface of the proximity switch. 9B is a diagram showing a case where the reference position of the detector is oriented at about 90 ° with respect to the center position of the detection surface of the proximity switch. 図１０Ａ、図１０Ｂは実施の形態１に係る検出装置の適用先であるバルブの構成例を示す図であり、図１０Ａはボール弁の構成例を示す図であり、図１０Ｂはバタフライ弁の構成例を示す図である。10A and 10B are diagrams showing a configuration example of a valve to which the detection device according to the first embodiment is applied, FIG. 10A is a diagram showing a configuration example of a ball valve, and FIG. 10B is a configuration of a butterfly valve. It is a figure which shows an example. 図１１Ａ〜図１１Ｃは実施の形態１に係る検出装置をバルブに適用した場合での検出体の向きと弁体の開度との関係の一例を示す図であり、図１１Ａは開度が全開である場合を示す図であり、図１１Ｂは開度が中間開度である場合を示す図であり、図１１Ｃは開度が全閉である場合を示す図である。11A to 11C are diagrams showing an example of the relationship between the orientation of the detector and the opening degree of the valve body when the detection device according to the first embodiment is applied to the valve, and FIG. 11A shows the opening degree fully opened. 11B is a diagram showing a case where the opening degree is an intermediate opening degree, and FIG. 11C is a diagram showing a case where the opening degree is fully closed.

以下、この発明の実施の形態について図面を参照しながら詳細に説明する。
実施の形態１．
図１は実施の形態１に係る検出装置の構成例を示す図である。
検出装置は、検出体２の向きを検出する。検出装置は、図１に示すように、近接スイッチ１及び検出体２を備えている。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1.
FIG. 1 is a diagram showing a configuration example of a detection device according to the first embodiment.
The detection device detects the orientation of the detector 2. As shown in FIG. 1, the detection device includes a proximity switch 1 and a detector 2.

近接スイッチ１は、検出体２の向きを検出可能とする。すなわち、近接スイッチ１は、検出体２の向きにより出力が変わる。近接スイッチ１は、センサヘッドである検出部１１と、一端が検出部１１の入出力端に接続されたケーブル１２と、ケーブル１２の他端に接続された複数の出力ピン１３とを有している。なお、近接スイッチ１では、ＩＯ−Ｌｉｎｋ等のように、出力ピン１３の本数が限られている。また、近接スイッチ１が有する複数の出力ピン１３のうち、信号出力に利用可能な出力ピン１３は２本である。また、近接スイッチ１のより詳細な構成例については後述する。 The proximity switch 1 can detect the orientation of the detector 2. That is, the output of the proximity switch 1 changes depending on the orientation of the detector 2. The proximity switch 1 has a detection unit 11 which is a sensor head, a cable 12 whose one end is connected to the input / output end of the detection unit 11, and a plurality of output pins 13 which are connected to the other end of the cable 12. There is. In the proximity switch 1, the number of output pins 13 is limited, as in IO-Link and the like. Further, among the plurality of output pins 13 included in the proximity switch 1, two output pins 13 can be used for signal output. A more detailed configuration example of the proximity switch 1 will be described later.

検出体２は、回転により近接スイッチ１が有する検出面（検出部１１の端面）との間の距離が変わる物体である。検出体２は、金属等のように導電性を有する物体である。検出体２は、回転軸方向から見た形状が、例えば、楕円形状（略楕円形状を含む）、又は回転軸が中心位置からずれた円形状（略円形状を含む）に構成されている。 The detector 2 is an object whose distance from the detection surface (end surface of the detection unit 11) of the proximity switch 1 changes due to rotation. The detector 2 is an object having conductivity such as metal. The shape of the detector 2 when viewed from the direction of the rotation axis is, for example, an elliptical shape (including a substantially elliptical shape) or a circular shape whose rotation axis deviates from the center position (including a substantially circular shape).

次に、近接スイッチ１の構成例について、図２を参照しながら説明する。
近接スイッチ１は、図２に示すように、検出用コイル１０１、電源１０２、安定化電源回路１０３、発振回路１０４、検波回路１０５、比較回路１０６、出力回路１０７、２系統のトランジスタ１０８（トランジスタ１０８ａ及びトランジスタ１０８ｂ）、及び設定入力部１０９を備えている。また、近接スイッチ１には、２系統の抵抗３（抵抗３ａ及び抵抗３ｂ）が接続されている。 Next, a configuration example of the proximity switch 1 will be described with reference to FIG.
As shown in FIG. 2, the proximity switch 1 includes a detection coil 101, a power supply 102, a regulated power supply circuit 103, an oscillation circuit 104, a detection circuit 105, a comparison circuit 106, an output circuit 107, and two transistors 108 (transistors 108a). And a transistor 108b), and a setting input unit 109. Further, two resistors 3 (resistors 3a and 3b) are connected to the proximity switch 1.

検出用コイル１０１は、コア（不図示）に対して円筒状に巻線され、検出部１１の筐体内において検出面に対向配置されている。
安定化電源回路１０３は、電源１０２から供給された電力により動作し、発振回路１０４、検波回路１０５及び比較回路１０６に対して所定の電圧の電力を供給する。 The detection coil 101 is wound in a cylindrical shape with respect to the core (not shown), and is arranged to face the detection surface in the housing of the detection unit 11.
The regulated power supply circuit 103 operates by the electric power supplied from the power supply 102, and supplies the electric power of a predetermined voltage to the oscillation circuit 104, the detection circuit 105, and the comparison circuit 106.

発振回路１０４は、発振して検出用コイル１０１に高周波磁界を発生させる。検出用コイル１０１が発生する高周波磁界に検出体２が近づくと、検出体２に誘導電流が流れて熱損失が発生し、検出用コイル１０１のインピーダンス又はＱ値等が変化して発振回路１０４による発振が減衰する。なお、発振回路１０４は、検出体２が最も近づいた場合でも発振を維持し、検出用コイル１０１のインピーダンス又はＱ値等の変化に応じて発振の振幅が変化するように構成されていてもよい。 The oscillation circuit 104 oscillates to generate a high-frequency magnetic field in the detection coil 101. When the detector 2 approaches the high-frequency magnetic field generated by the detection coil 101, an induced current flows through the detector 2 to generate heat loss, and the impedance or Q value of the detection coil 101 changes due to the oscillation circuit 104. Oscillation is attenuated. The oscillation circuit 104 may be configured to maintain oscillation even when the detector 2 is closest to the detection coil 101, and to change the oscillation amplitude according to a change in the impedance or Q value of the detection coil 101. ..

検波回路１０５は、発振回路１０４による発振の振幅を検波する。すなわち、検波回路１０５は、発振回路１０４による発振の振幅を直流化して整流する。 The detection circuit 105 detects the amplitude of oscillation by the oscillation circuit 104. That is, the detection circuit 105 converts the amplitude of oscillation by the oscillation circuit 104 into direct current and rectifies it.

比較回路１０６は、検波回路１０５により検波された振幅（検出値）を複数の閾値（第１の閾値〜第３の閾値及び上限値）とそれぞれ比較する。第２の閾値は、第１の閾値とは異なる値の閾値である。第３の閾値は、第１の閾値と第２の閾値との間の値の閾値である。なお、各閾値（第１の閾値〜第３の閾値）は設定入力部１０９により設定される。 The comparison circuit 106 compares the amplitude (detected value) detected by the detection circuit 105 with a plurality of threshold values (first threshold value to third threshold value and upper limit value), respectively. The second threshold value is a threshold value having a value different from that of the first threshold value. The third threshold is a threshold of values between the first threshold and the second threshold. Each threshold value (first threshold value to third threshold value) is set by the setting input unit 109.

出力回路１０７は、比較回路１０６による各閾値との比較結果に基づいて、検波回路１０５により検波された振幅が各出力範囲内であるかを示す信号をそれぞれ出力する。各出力範囲は、各閾値から構成される範囲である。
具体的には、出力回路１０７は、検波回路１０５により検波された振幅が第１の出力範囲内である場合に、２つの出力端子のうちの一方からオン信号を出力する。また、出力回路１０７は、検波回路１０５により検波された振幅が第２の出力範囲内である場合に、２つの出力端子のうちの他方からオン信号を出力する。第１の出力範囲は、第１の閾値と第２の閾値から構成される範囲である。また、第２の出力範囲は、第３の閾値と上限値から構成される範囲である。すなわち、第１の出力範囲と第２の出力範囲は互いに一部が重複している。出力回路１０７が有する２つの出力端子からの出力と、検出体２の向きとの対応関係の一例を図３に示す。 The output circuit 107 outputs a signal indicating whether the amplitude detected by the detection circuit 105 is within each output range based on the comparison result with each threshold value by the comparison circuit 106. Each output range is a range composed of each threshold value.
Specifically, the output circuit 107 outputs an on signal from one of the two output terminals when the amplitude detected by the detection circuit 105 is within the first output range. Further, the output circuit 107 outputs an on signal from the other of the two output terminals when the amplitude detected by the detection circuit 105 is within the second output range. The first output range is a range composed of a first threshold value and a second threshold value. The second output range is a range composed of a third threshold value and an upper limit value. That is, the first output range and the second output range partially overlap each other. FIG. 3 shows an example of the correspondence between the outputs from the two output terminals of the output circuit 107 and the orientation of the detector 2.

図３では、出力回路１０７が有する２つの出力端子のうちの一方からの出力（第１の出力）として、オン信号が出力されている状態をＯＮとし、オン信号が出力されていない状態をＯＦＦとしている。また、出力回路１０７が有する２つの出力端子のうちの他方からの出力（第２の出力）として、オン信号が出力されている状態をＯＮとし、オン信号が出力されていない状態をＯＦＦとしている。 In FIG. 3, as an output (first output) from one of the two output terminals of the output circuit 107, the state in which the on signal is output is turned on, and the state in which the on signal is not output is turned off. It is said. Further, as an output (second output) from the other of the two output terminals of the output circuit 107, the state in which the on signal is output is set to ON, and the state in which the on signal is not output is set to OFF. ..

トランジスタ１０８ａは、ゲート端子が、出力回路１０７が有する２つの出力端子のうちの一方に接続され、エミッタ端子が電源１０２のプラス端子に接続されている。トランジスタ１０８ａは、出力回路１０７が有する２つの出力端子のうちの一方からのオン信号により駆動する。 In the transistor 108a, the gate terminal is connected to one of the two output terminals of the output circuit 107, and the emitter terminal is connected to the positive terminal of the power supply 102. The transistor 108a is driven by an on signal from one of the two output terminals of the output circuit 107.

トランジスタ１０８ｂは、ゲート端子が、出力回路１０７が有する２つの出力端子のうちの他方に接続され、エミッタ端子が電源１０２のプラス端子に接続されている。トランジスタ１０８ｂは、出力回路１０７が有する２つの出力端子のうちの他方からのオン信号により駆動する。 In the transistor 108b, the gate terminal is connected to the other of the two output terminals of the output circuit 107, and the emitter terminal is connected to the positive terminal of the power supply 102. The transistor 108b is driven by an on signal from the other of the two output terminals of the output circuit 107.

設定入力部１０９は、比較回路１０６に対する各閾値を設定する。設定入力部１０９は、各閾値を、近接スイッチ１が用いられる現場で設定可能である。設定入力部１０９は、トリガ受付部１０９１及び閾値設定部１０９２を有している。 The setting input unit 109 sets each threshold value for the comparison circuit 106. The setting input unit 109 can set each threshold value at the site where the proximity switch 1 is used. The setting input unit 109 has a trigger receiving unit 1091 and a threshold value setting unit 1092.

トリガ受付部１０９１は、トリガの入力を受付ける。トリガ受付部１０９１としては、例えば、外部端末からの情報を受信する通信部、又は、押しボタン等の設定用トリガ装置等を用いることができる。 The trigger receiving unit 1091 receives the input of the trigger. As the trigger receiving unit 1091, for example, a communication unit that receives information from an external terminal, a setting trigger device such as a push button, or the like can be used.

閾値設定部１０９２は、検波回路１０５により検波された振幅の値をトリガ受付部１０９１によりトリガの入力が受付けられる度に検出し、当該検出した各振幅の値に基づいて、比較回路１０６に対する各閾値を設定する。なお、閾値設定部１０９２は、システムＬＳＩ（Ｌａｒｇｅ Ｓｃａｌｅ Ｉｎｔｅｇｒａｔｉｏｎ）等の処理回路、又はメモリ等に記憶されたプログラムを実行するＣＰＵ（Ｃｅｎｔｒａｌ Ｐｒｏｃｅｓｓｉｎｇ Ｕｎｉｔ）等により実現される。 The threshold value setting unit 1092 detects the value of the amplitude detected by the detection circuit 105 each time the trigger input is received by the trigger reception unit 1091, and based on the value of each detected amplitude, each threshold value with respect to the comparison circuit 106. To set. The threshold value setting unit 1092 is realized by a processing circuit such as a system LSI (Large Scale Integration), a CPU (Central Processing Unit) that executes a program stored in a memory or the like, or the like.

この際、閾値設定部１０９２は、出力回路１０７の各出力範囲が互いに一部重複するように、上記各振幅の値の間の値を、当該各出力範囲を構成する各下限値及び各上限値のうちの最上限値を除く値である閾値としてそれぞれ設定する。
又は、閾値設定部１０９２は、出力回路１０７の各出力範囲が互いに一部重複するように、上記各振幅の値を、当該各出力範囲を構成する各下限値及び各上限値のうちの最上限値を除く値である閾値としてそれぞれ設定してもよい。 At this time, the threshold value setting unit 1092 sets the values between the values of the respective amplitudes so that the output ranges of the output circuit 107 partially overlap each other, and each lower limit value and each upper limit value constituting the output range. Each is set as a threshold value excluding the uppermost value of the above.
Alternatively, the threshold value setting unit 1092 sets the value of each of the above amplitudes to the upper limit of each lower limit value and each upper limit value constituting the output range so that the output ranges of the output circuit 107 partially overlap each other. Each may be set as a threshold value excluding the value.

なお、抵抗３ａは、一端がトランジスタ１０８ａのコレクタ端子に接続され、他端が電源１０２のマイナス端子に接続されている。抵抗３ａは、トランジスタ１０８ａが駆動することで電源１０２から電力が供給される。
また、抵抗３ｂは、一端がトランジスタ１０８ｂのコレクタ端子に接続され、他端が電源１０２のマイナス端子に接続されている。抵抗３ｂは、トランジスタ１０８ｂが駆動することで電源１０２から電力が供給される。
抵抗３ａ，３ｂとしては、例えばＰＬＣ（Ｐｒｏｇｒａｍｍａｂｌｅ Ｌｏｇｉｃ Ｃｏｎｔｒｏｌｌｅｒ）又はリレー等の負荷が挙げられる。 One end of the resistor 3a is connected to the collector terminal of the transistor 108a, and the other end is connected to the negative terminal of the power supply 102. Power is supplied from the power source 102 to the resistor 3a by driving the transistor 108a.
Further, one end of the resistor 3b is connected to the collector terminal of the transistor 108b, and the other end is connected to the negative terminal of the power supply 102. Power is supplied from the power source 102 to the resistor 3b by driving the transistor 108b.
Examples of the resistors 3a and 3b include a load such as a PLC (Programmable Logical Controller) or a relay.

そして、この近接スイッチ１により、抵抗３ａ及び抵抗３ｂに供給される電力から、検出領域に存在する検出体２の向きを検出できる。図１に示すように近接スイッチ１が２つの出力を有する場合、図３に示すように、検出体２の向きが４つの範囲（第１の範囲〜第４の範囲）のうちのどの範囲であるかを検出可能となる。 Then, the proximity switch 1 can detect the direction of the detector 2 existing in the detection region from the power supplied to the resistors 3a and 3b. When the proximity switch 1 has two outputs as shown in FIG. 1, the orientation of the detector 2 is in any of the four ranges (first range to fourth range) as shown in FIG. It becomes possible to detect the existence.

次に、実施の形態１における設定入力部１０９による各閾値（第１の閾値〜第３の閾値）の設定方法について説明する。図４〜７は、検出体２と近接スイッチ１との間の距離が変化した場合での、近接スイッチ１での検出値の変化の一例を示す図である。図４〜７では、回転軸方向から見た形状が楕円形状である検出体２を用い、この検出体２を図４に示す向きから左側に回転させた場合を示している。図４〜７に示すグラフにおいて、横軸は検出体２の向き（角度）を示し、縦軸は近接スイッチ１での検出値を示している。検出体２の向きは、検出体２の基準位置と回転軸とを結ぶ線分と、検出体２の回転軸と近接スイッチ１が有する検出面の中心位置とを結ぶ線分とが成す角度である。 Next, a method of setting each threshold value (first threshold value to third threshold value) by the setting input unit 109 in the first embodiment will be described. 4 to 7 are diagrams showing an example of a change in the detected value of the proximity switch 1 when the distance between the detector 2 and the proximity switch 1 changes. 4 to 7 show a case where the detector 2 having an elliptical shape when viewed from the rotation axis direction is used and the detector 2 is rotated to the left from the direction shown in FIG. In the graphs shown in FIGS. 4 to 7, the horizontal axis represents the direction (angle) of the detector 2, and the vertical axis represents the value detected by the proximity switch 1. The orientation of the detector 2 is an angle formed by a line segment connecting the reference position of the detector 2 and the rotation axis and a line segment connecting the rotation axis of the detector 2 and the center position of the detection surface of the proximity switch 1. is there.

また以下では、作業者が実際に検出を行いたい向きに検出体２を置いて近接スイッチ１がその際の検出値を得て、閾値設定部１０９２が、出力回路１０７の各出力範囲が互いに一部重複するように、上記各検出値の間の値を、当該各出力範囲を構成する各下限値及び各上限値のうちの最上限値（第２の出力範囲を構成する上限値）を除く値である閾値としてそれぞれ設定する場合を示す。 Further, in the following, the detection body 2 is placed in the direction in which the operator actually wants to perform detection, the proximity switch 1 obtains the detection value at that time, and the threshold setting unit 1092 sets the output ranges of the output circuits 107 to one with each other. The values between the above detected values are excluded from the lower limit value and the upper limit value (upper limit value constituting the second output range) of the upper limit values constituting the output range so as to partially overlap. The case where each is set as the threshold value which is a value is shown.

この場合、図４に示すように、まず、作業者は、検出体２の基準位置を、近接スイッチ１が有する検出面の中心位置（０°）の方向に向ける（第１の角度）。そして、作業者は、トリガ受付部１０９１に対してトリガを入力し、近接スイッチ１はその際の発振の振幅の値（符号４０１に示す第１の検出値）を得る。
次いで、図５に示すように、作業者は、検出体２の基準位置を、近接スイッチ１が有する検出面の中心位置に対して約３０°の方向に向ける（第２の角度）。そして、作業者は、トリガ受付部１０９１に対してトリガを入力し、近接スイッチ１はその際の発振の振幅の値（符号５０１に示す第２の検出値）を得る。
その後、図８に示すように、閾値設定部１０９２は、第１の検出値と第２の検出値との間の値を、第１の出力範囲を構成する下限値（符号８０１に示す第１の閾値）として設定する。 In this case, as shown in FIG. 4, the operator first directs the reference position of the detection body 2 toward the center position (0 °) of the detection surface of the proximity switch 1 (first angle). Then, the operator inputs a trigger to the trigger receiving unit 1091, and the proximity switch 1 obtains the value of the amplitude of the oscillation at that time (the first detected value shown by reference numeral 401).
Next, as shown in FIG. 5, the operator directs the reference position of the detector 2 in a direction of about 30 ° with respect to the center position of the detection surface of the proximity switch 1 (second angle). Then, the operator inputs a trigger to the trigger receiving unit 1091, and the proximity switch 1 obtains the value of the amplitude of the oscillation at that time (the second detected value shown by reference numeral 501).
After that, as shown in FIG. 8, the threshold value setting unit 1092 sets a value between the first detection value and the second detection value as the lower limit value (the first value indicated by reference numeral 801) constituting the first output range. Threshold) is set.

次いで、図６に示すように、作業者は、検出体２の基準位置を、近接スイッチ１が有する検出面の中心位置に対して約６０°の方向に向ける（第３の角度）。そして、作業者は、トリガ受付部１０９１に対してトリガを入力し、近接スイッチ１はその際の発振の振幅の値（符号６０１に示す第３の検出値）を得る。
その後、図８に示すように、閾値設定部１０９２は、第２の検出値と第３の検出値との間の値を、第２の出力範囲を構成する下限値（符号８０２に示す第３の閾値）として設定する。 Next, as shown in FIG. 6, the operator directs the reference position of the detector 2 in a direction of about 60 ° with respect to the center position of the detection surface of the proximity switch 1 (third angle). Then, the operator inputs a trigger to the trigger receiving unit 1091, and the proximity switch 1 obtains the value of the amplitude of the oscillation at that time (the third detected value shown by reference numeral 601).
After that, as shown in FIG. 8, the threshold value setting unit 1092 sets a value between the second detection value and the third detection value as the lower limit value (the third value shown by reference numeral 802) constituting the second output range. Threshold) is set.

次いで、図７に示すように、作業者は、検出体２の基準位置を、近接スイッチ１が有する検出面の中心位置に対して約９０°の方向に向ける（第４の角度）。そして、作業者は、トリガ受付部１０９１に対してトリガを入力し、近接スイッチ１はその際の発振の振幅の値（符号７０１に示す第４の検出値）を得る。
その後、図８に示すように、閾値設定部１０９２は、第３の検出値と第４の検出値との間の値を、第１の出力範囲を構成する上限値（符号８０３に示す第２の閾値）として設定する。
以上により、設定入力部１０９は、第１の出力範囲及び第２の出力範囲を構成する各閾値を設定できる。 Next, as shown in FIG. 7, the operator directs the reference position of the detector 2 in a direction of about 90 ° with respect to the center position of the detection surface of the proximity switch 1 (fourth angle). Then, the operator inputs a trigger to the trigger receiving unit 1091, and the proximity switch 1 obtains the value of the amplitude of the oscillation at that time (the fourth detected value shown by reference numeral 701).
After that, as shown in FIG. 8, the threshold value setting unit 1092 sets the value between the third detection value and the fourth detection value to the upper limit value (second indicated by reference numeral 803) constituting the first output range. Threshold) is set.
As described above, the setting input unit 109 can set each threshold value constituting the first output range and the second output range.

上記では、検出体２を出力範囲を構成する下限値及び上限値の間の向き（すなわち、実際に検出体２の検出を行いたい向き）に置いて閾値を設定する場合を示した。しかしながら、閾値の設定方法はこれに限らず、検出体２を出力範囲を構成する下限値及び上限値の向きにおいて閾値を設定してもよい。 In the above, the case where the detection body 2 is placed in the direction between the lower limit value and the upper limit value constituting the output range (that is, the direction in which the detection body 2 is actually desired to be detected) is set to set the threshold value. However, the method of setting the threshold value is not limited to this, and the threshold value may be set in the directions of the lower limit value and the upper limit value constituting the output range of the detector 2.

このように、実施の形態１に係る検出装置では、回転により近接スイッチ１が有する検出面との間の距離が変わる検出体２を用い、この検出体２との間で複数角度でチューニングを行う（例えば検出値の中間値を自動的に閾値に設定する）。これにより、実施の形態１に係る検出装置では、単一の近接スイッチ１で、検出体２の向きを複数の範囲で区別して検出可能となり、従来の複数の近接スイッチを用いた場合と同等の機能が得られる。 As described above, in the detection device according to the first embodiment, the detection body 2 whose distance to the detection surface of the proximity switch 1 changes due to rotation is used, and tuning is performed with the detection body 2 at a plurality of angles. (For example, the intermediate value of the detected value is automatically set as the threshold value). As a result, in the detection device according to the first embodiment, the orientation of the detector 2 can be distinguished and detected in a plurality of ranges by a single proximity switch 1, which is equivalent to the case where a plurality of conventional proximity switches are used. The function is obtained.

なお、検出体２は、回転により近接スイッチ１が有する検出面との間の距離が連続的に変化する形状（回転軸方向から見た形状が、楕円形状、又は回転軸が中心位置からずれた円形状等）に構成されていることが好ましい。
しかしながら、これに限らず、チューニングの見通しがある場合等には、例えば図９に示すように、検出体２は、回転により近接スイッチ１が有する検出面との間の距離が段階的（不連続）に変化する形状（回転軸方向から見た形状が段差を有する形状）に構成されていてもよい。図９では、検出体２の上記段差が２段である場合を示している。一方、検出体２の上記段差の段数を増加させることで、実質的に近接スイッチ１が有する検出面との距離が連続的に変化する形状に近づく。 The detection body 2 has a shape in which the distance between the detection body 2 and the detection surface of the proximity switch 1 continuously changes due to rotation (the shape seen from the rotation axis direction is an elliptical shape, or the rotation axis deviates from the center position. It is preferably configured in a circular shape or the like.
However, not limited to this, when there is a prospect of tuning, for example, as shown in FIG. 9, the distance between the detector 2 and the detection surface of the proximity switch 1 is stepwise (discontinuous) due to rotation. ) May be configured (the shape seen from the direction of the rotation axis has a step). FIG. 9 shows a case where the step of the detector 2 is two steps. On the other hand, by increasing the number of steps of the detection body 2, the distance between the proximity switch 1 and the detection surface is substantially changed.

次に、実施の形態１に係る検出装置の適用例について示す。
実施の形態１に係る検出装置は、例えば図１０に示すように、回転動作を行う弁体５１を有するバルブ５に適用可能である。このバルブ５としては、例えば図１０Ａに示すボール弁５ａ又は図１０Ｂに示すバタフライ弁５ｂが挙げられる。 Next, an application example of the detection device according to the first embodiment will be described.
The detection device according to the first embodiment can be applied to a valve 5 having a valve body 51 that performs a rotational operation, for example, as shown in FIG. Examples of the valve 5 include the ball valve 5a shown in FIG. 10A and the butterfly valve 5b shown in FIG. 10B.

ボール弁５ａは、図１０Ａに示すように、回転動作を行う弁体５１ａと、弁体５１ａに連結された回転軸であるステム５２ａとを有している。そして、検出体２はステム５２ａに取付けられる。
同様に、バタフライ弁５ｂは、図１０Ｂに示すように、回転動作を行う弁体５１ｂと、弁体５１ｂに連結された回転軸であるステム５２ｂとを有している。そして、検出体２はステム５２ｂに取付けられる。 As shown in FIG. 10A, the ball valve 5a has a valve body 51a that performs a rotational operation and a stem 52a that is a rotation shaft connected to the valve body 51a. Then, the detector 2 is attached to the stem 52a.
Similarly, as shown in FIG. 10B, the butterfly valve 5b has a valve body 51b that performs a rotary operation and a stem 52b that is a rotation shaft connected to the valve body 51b. Then, the detector 2 is attached to the stem 52b.

このように、実施の形態１に係る検出装置が、回転動作を行う弁体５１を有するバルブ５に適用されることで、検出体２が取付けられるステム５２は弁体５１の開度に応じて回転するため、検出装置は弁体５１の開度を検出可能となる。 As described above, when the detection device according to the first embodiment is applied to the valve 5 having the valve body 51 that performs the rotational operation, the stem 52 to which the detection body 2 is attached responds to the opening degree of the valve body 51. Since it rotates, the detection device can detect the opening degree of the valve body 51.

すなわち、例えば図１１Ａに示すように、検出体２の基準位置が近接スイッチ１が有する検出面の中心位置の方向を向いている場合には弁体５１の開度が全開であると判定できる。また、例えば図１１Ｂに示すように、検出体２の基準位置が近接スイッチ１が有する検出面の中心位置に対して約４５°の方向を向いている場合には弁体５１の開度が中間開度であると判定できる。また、例えば図１１Ｃに示すように、検出体２の基準位置が近接スイッチ１の中心位置に対して約９０°の方向を向いている場合には弁体５１の開度が全閉であると判定できる。 That is, for example, as shown in FIG. 11A, when the reference position of the detection body 2 faces the direction of the center position of the detection surface of the proximity switch 1, it can be determined that the opening degree of the valve body 51 is fully open. Further, for example, as shown in FIG. 11B, when the reference position of the detection body 2 faces the direction of about 45 ° with respect to the center position of the detection surface of the proximity switch 1, the opening degree of the valve body 51 is intermediate. It can be determined that it is the opening degree. Further, for example, as shown in FIG. 11C, when the reference position of the detection body 2 faces the direction of about 90 ° with respect to the center position of the proximity switch 1, the opening degree of the valve body 51 is fully closed. Can be judged.

以上のように、この実施の形態１によれば、検出装置は、近接スイッチ１と、導電性を有し、回転により近接スイッチ１が有する検出面との間の距離が変わる検出体２とを備え、近接スイッチ１は、筐体内において検出面に対向配置された検出用コイル１０１と、発振して検出用コイル１０１に高周波磁界を発生させる発振回路１０４と、発振回路１０４による発振の振幅を検波する検波回路１０５と、検波回路１０５により検波された振幅を複数の閾値とそれぞれ比較する比較回路１０６と、比較回路１０６による複数の閾値との比較結果に基づいて、検波回路１０５により検波された振幅が当該複数の閾値から構成される複数の出力範囲内であるかを示す信号をそれぞれ出力する出力回路１０７と、比較回路１０６に対する複数の閾値を設定する設定入力部１０９とを有する。これにより、実施の形態１に係る検出装置は、単一の近接スイッチ１で、検出体２の状態を複数区別して検出可能となる。 As described above, according to the first embodiment, the detection device includes the proximity switch 1 and the detector 2 which has conductivity and whose distance between the detection surface of the proximity switch 1 changes due to rotation. The proximity switch 1 detects the amplitude of oscillation by the detection coil 101, which is arranged to face the detection surface in the housing, the oscillation circuit 104 which oscillates to generate a high-frequency magnetic field in the detection coil 101, and the oscillation circuit 104. The amplitude detected by the detection circuit 105 based on the comparison result between the detection circuit 105, the comparison circuit 106 that compares the amplitude detected by the detection circuit 105 with a plurality of thresholds, and the plurality of thresholds by the comparison circuit 106. It has an output circuit 107 that outputs a signal indicating whether or not is within a plurality of output ranges composed of the plurality of thresholds, and a setting input unit 109 that sets a plurality of thresholds for the comparison circuit 106. As a result, the detection device according to the first embodiment can detect a plurality of states of the detector 2 by distinguishing them with a single proximity switch 1.

なお、本願発明はその発明の範囲内において、実施の形態の任意の構成要素の変形、若しくは実施の形態の任意の構成要素の省略が可能である。 In the present invention, within the scope of the invention, it is possible to modify any component of the embodiment or omit any component of the embodiment.

１ 近接スイッチ
２ 検出体
３，３ａ，３ｂ 抵抗
５ バルブ
５ａ ボール弁
５ｂ バタフライ弁
１１ 検出部
１２ ケーブル
１３ 出力ピン
５１，５１ａ，５１ｂ 弁体
５２，５２ａ，５２ｂ ステム
１０１ 検出用コイル
１０２ 電源
１０３ 安定化電源回路
１０４ 発振回路
１０５ 検波回路
１０６ 比較回路
１０７ 出力回路
１０８，１０８ａ，１０８ｂ トランジスタ
１０９ 設定入力部
１０９１ トリガ受付部
１０９２ 閾値設定部 1 Proximity switch 2 Detector 3,3a, 3b Resistance 5 Valve 5a Ball valve 5b Butterfly valve 11 Detection unit 12 Cable 13 Output pin 51, 51a, 51b Valve body 52, 52a, 52b Stem 101 Detection coil 102 Power supply 103 Stabilization Power supply circuit 104 Oscillation circuit 105 Detection circuit 106 Comparison circuit 107 Output circuit 108, 108a, 108b Transistor 109 Setting input unit 1091 Trigger reception unit 1092 Threshold setting unit

Claims (5)

近接スイッチと、
導電性を有し、回転により前記近接スイッチが有する検出面との間の距離が変わる検出体とを備え、
前記近接スイッチは、
筐体内において前記検出面に対向配置された検出用コイルと、
発振して前記検出用コイルに高周波磁界を発生させる発振回路と、
前記発振回路による発振の振幅を検波する検波回路と、
前記検波回路により検波された振幅を複数の閾値とそれぞれ比較する比較回路と、
前記比較回路による複数の閾値との比較結果に基づいて、前記検波回路により検波された振幅が当該複数の閾値から構成される複数の出力範囲内であるかを示す信号をそれぞれ出力する出力回路と、
前記比較回路に対する複数の閾値を設定する設定入力部とを有する
ことを特徴とする検出装置。 Proximity switch and
It is provided with a detector that is conductive and whose distance to the detection surface of the proximity switch changes due to rotation.
The proximity switch
A detection coil arranged to face the detection surface in the housing,
An oscillation circuit that oscillates and generates a high-frequency magnetic field in the detection coil,
A detection circuit that detects the amplitude of oscillation by the oscillation circuit and
A comparison circuit that compares the amplitude detected by the detection circuit with a plurality of threshold values, respectively.
An output circuit that outputs a signal indicating whether the amplitude detected by the detection circuit is within a plurality of output ranges composed of the plurality of threshold values based on the comparison result with the plurality of threshold values by the comparison circuit. ,
A detection device including a setting input unit for setting a plurality of threshold values for the comparison circuit. 前記比較回路は、前記検波回路により検波された振幅を、第１の閾値と、当該第１の閾値とは異なる値である第２の閾値と、当該第１の閾値と当該第２の閾値との間の値である第３の閾値と、上限値と、それぞれ比較し、
前記出力回路は、前記比較回路による複数の閾値との比較結果に基づいて、前記検波回路により検波された振幅が、前記第１の閾値と前記第２の閾値から構成される第１の出力範囲内であるかを示す信号と、前記第３の閾値と上限値から構成される第２の出力範囲内であるかを示す信号をそれぞれ出力する
ことを特徴とする請求項１記載の検出装置。 The comparison circuit uses the amplitude detected by the detection circuit as a first threshold value, a second threshold value that is a value different from the first threshold value, the first threshold value, and the second threshold value. The third threshold value, which is a value between, and the upper limit value are compared with each other.
The output circuit has a first output range in which the amplitude detected by the detection circuit is composed of the first threshold value and the second threshold value based on the comparison result with a plurality of threshold values by the comparison circuit. The detection device according to claim 1, wherein a signal indicating whether or not it is within the range and a signal indicating whether or not it is within the second output range composed of the third threshold value and the upper limit value are output. 前記検出体は、回転軸方向から見た形状が、楕円形状、又は回転軸が中心位置からずれた円形状に構成された
ことを特徴とする請求項１又は請求項２記載の検出装置。 The detection device according to claim 1 or 2, wherein the detector is formed in an elliptical shape when viewed from the direction of the rotation axis, or a circular shape in which the rotation axis is deviated from the center position. 前記検出体は、回転軸方向から見た形状が、段差を有する形状に構成された
ことを特徴とする請求項１又は請求項２記載の検出装置。 The detection device according to claim 1 or 2, wherein the detector is formed in a shape having a step when viewed from the direction of the rotation axis. 回転動作を行う弁体と、
前記弁体に連結されたステムと、
請求項１から請求項４のうちの何れか１項記載の検出装置とを備え、
前記検出体は、前記ステムに取付けられた
ことを特徴とするバルブ。 A valve body that rotates and
The stem connected to the valve body and
The detection device according to any one of claims 1 to 4 is provided.
The detector is a valve that is attached to the stem.
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