JPH0416235Y2 - - Google Patents
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- Publication number
- JPH0416235Y2 JPH0416235Y2 JP753287U JP753287U JPH0416235Y2 JP H0416235 Y2 JPH0416235 Y2 JP H0416235Y2 JP 753287 U JP753287 U JP 753287U JP 753287 U JP753287 U JP 753287U JP H0416235 Y2 JPH0416235 Y2 JP H0416235Y2
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- Japan
- Prior art keywords
- detection
- pressure
- back pressure
- orifice
- detected
- Prior art date
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- Expired
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- 238000001514 detection method Methods 0.000 claims description 119
- 230000007246 mechanism Effects 0.000 claims description 40
- 238000005259 measurement Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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- Measuring Arrangements Characterized By The Use Of Fluids (AREA)
- Geophysics And Detection Of Objects (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は、所謂空気マイクロメータの原理を応
用し、物体等を検出するための背圧式の検出装置
に関するものである。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a back pressure type detection device for detecting objects, etc. by applying the principle of a so-called air micrometer.
（従来の技術）
従来のこの種の検出装置には、第６図ａ乃至ｄ
に示すようなものがある。同図ａに示すもので
は、空気流路の上流側から空気用減圧弁１、流入
流量調整オリフイス２及び検出オリフイス３をこ
の順序で主流路４に直列に接続し、流入流量調整
オリフイス２と検出オリフイス３との間に背圧を
検出する圧力検出機構５が接続してあり、同図ｂ
に示すものでは、流出流量調整オリフイス２ａを
分岐流路６中に設けてあり、同図ｃに示したもの
では、主流路４と分岐流路６との圧力検出機構５
を接続し、分岐流路５の下流に流出流量調整オリ
フイス２ａを設けており、同図ｄに示すもので
は、並列流路の一方に流量調整オリフイス２を、
他方にはダイアフラムを備えた排気弁７を接続
し、排気弁７の上流に圧力検出機構５を接続して
あり、これらはいずれも背圧を圧力検出機構５で
検出して被検出物９と検出オリフイス３との隙間
ｈを知り被検出物９を検出する。上記の場合、検
出オリフイス３は、例えば第７図に示すように、
主流路４の開口部が細く絞られて小径とされ、前
記背圧を測定することによつて先端面と被検出物
９との隙間ｈの大きさを知ることができるように
なつている。(Prior art) A conventional detection device of this type includes the one shown in FIGS.
There is something like this. In the device shown in Figure a, an air pressure reducing valve 1, an inflow flow rate adjustment orifice 2, and a detection orifice 3 are connected in series to the main flow path 4 in this order from the upstream side of the air flow path, and the inflow flow rate adjustment orifice 2 and detection orifice 3 are connected in series to the main flow path 4 in this order. A pressure detection mechanism 5 for detecting back pressure is connected between the orifice 3 and
In the one shown in FIG.
An outflow flow rate adjustment orifice 2a is provided downstream of the branch flow path 5, and in the one shown in FIG.
An exhaust valve 7 equipped with a diaphragm is connected to the other side, and a pressure detection mechanism 5 is connected upstream of the exhaust valve 7. In both of these, the back pressure is detected by the pressure detection mechanism 5 and the detected object 9 is detected. The object 9 to be detected is detected by knowing the gap h with the detection orifice 3. In the above case, the detection orifice 3 is, for example, as shown in FIG.
The opening of the main flow path 4 is narrowed to a small diameter, and by measuring the back pressure, the size of the gap h between the tip end face and the object to be detected 9 can be determined.
第８図は、縦軸に背圧を、横軸に隙間をそれぞ
れとつて、上記隙間と背圧との関係を表わしたグ
ラフである。圧力検出機構中に設けた圧力縦電器
等を、予め検出したい隙間に相当する背圧に合わ
せて調整しておき、被検出物がＡ点の位置からＢ
点の位置に近付くと、背圧がＡ点における値Ｐか
らＢ点における値P′まで上昇するので、この背圧
P′から当該隙間の大きさを知ることができるもの
である。 FIG. 8 is a graph showing the relationship between the gap and the back pressure, with the vertical axis representing the back pressure and the horizontal axis representing the gap. Adjust the pressure vertical electric device etc. installed in the pressure detection mechanism in advance according to the back pressure corresponding to the gap you want to detect, and move the object to be detected from point A to point B.
As the point approaches the position, the back pressure increases from the value P at point A to the value P' at point B, so this back pressure
The size of the gap can be determined from P'.
（考案が解決しようとする問題点）
検出装置にはタイムラグがあつて、第８図の背
圧がＰからP′まで上昇するには時間がかかる。第
９図ａ及びｂは、縦軸にいずれも同一目盛で背圧
をとり、横軸にそれぞれ上記隙間及び経過時間を
とつて、上記隙間及び経過時間ｔと背圧ｐとの関
係をそれぞれ示したグラフである。即ち、背圧が
所定圧力P′まで上昇するには時間t2以上を要し、
従来はこの時間t2まで待たなければならず、即時
に当該隙間の大きさを知ることができないので、
不便であるという問題点があつた。また、経過時
間t2を待たずに時間を短縮して、例えばt1の時点
における背圧P″に基き隙間を検出するとすると、
検出誤差が大きいという欠点があつた。(Problems to be solved by the invention) There is a time lag in the detection device, and it takes time for the back pressure shown in FIG. 8 to rise from P to P'. Figures 9a and b show the relationship between the gap and elapsed time t and the back pressure p, with the vertical axis representing the back pressure on the same scale, and the horizontal axis representing the gap and elapsed time, respectively. This is a graph. That is, it takes time t 2 or more for the back pressure to rise to the predetermined pressure P′,
Conventionally, we had to wait until this time t 2 and could not immediately know the size of the gap, so
The problem was that it was inconvenient. Also, if we shorten the time without waiting for the elapsed time t 2 and detect a gap based on the back pressure P'' at the time t 1 , for example,
The drawback was that the detection error was large.
本考案は、上記従来の欠点にかんがみ、短時間
でしかも小さい検出誤差で物体等を検出すること
ができる検出装置を提供することを目的とするも
のである。 SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the conventional art, it is an object of the present invention to provide a detection device that can detect objects, etc. in a short time and with a small detection error.
（問題点を解決するための手段）
上記目的を達成するために、本考案は、流量調
整オリフイス、被検出物に向けて空気を流出させ
る検出オリフイス及び該検出オリフイスと被検出
物との隙間に対応した背圧を検出する圧力検出機
構を備えた背圧式の検出装置において、前記被検
出物と前記検出オリフイスとの相対動作に関連さ
せて検出開始信号を発する検出開始信号発生手段
と、前記検出開始信号を受けて所定経過時間の測
定を開始するタイマと、該タイマにより測定され
た前記所定経過時間以内に前記圧力検出機構から
の設定圧力到達信号の有無を検出し該検出結果に
対応した信号を出力する検出手段とを設けたこと
を特徴として構成されている。(Means for Solving the Problems) In order to achieve the above object, the present invention provides a flow rate adjustment orifice, a detection orifice for discharging air toward the object to be detected, and a gap between the detection orifice and the object to be detected. In a back pressure type detection device equipped with a pressure detection mechanism that detects a corresponding back pressure, a detection start signal generating means for generating a detection start signal in relation to relative movement between the detected object and the detection orifice; A timer that starts measuring a predetermined elapsed time upon receiving a start signal, and a signal that detects the presence or absence of a set pressure reaching signal from the pressure detection mechanism within the predetermined elapsed time measured by the timer and corresponds to the detection result. The present invention is characterized in that it is provided with a detection means for outputting.
（作用）
本考案に係る検出装置は、流量調整オリフイ
ス、被検出物に向けて空気を流出させる検出オリ
フイス及び該検出オリフイスと被検出物との隙間
に対応した背圧を検出する圧力検出機構を備え、
前記被検出物と前記検出オリフイスとの相対動作
に関連させて検出開始信号発生手段により発した
検出開始信号を受けてタイマで所定経過時間の測
定を開始し、該タイマにより測定された前記所定
経過時間以内に前記圧力検出機構からの設定圧力
到達信号の有無を検出手段で検出し該検出結果に
対応した信号を出力して、短時間でしかも精度良
く被検出物の検出をすることができる。(Function) The detection device according to the present invention includes a flow rate adjustment orifice, a detection orifice that causes air to flow out toward the object to be detected, and a pressure detection mechanism that detects back pressure corresponding to the gap between the detection orifice and the object to be detected. Prepare,
A timer starts measuring a predetermined elapsed time in response to a detection start signal generated by a detection start signal generating means in relation to the relative movement between the detected object and the detection orifice, and the predetermined elapsed time measured by the timer is started. The detecting means detects the presence or absence of the set pressure reaching signal from the pressure detecting mechanism within a certain period of time, and outputs a signal corresponding to the detection result, thereby making it possible to detect the object in a short time and with high precision.
（実施例）
次に、本考案の実施例について、図面を参照し
ながら説明する。第１図ａは本考案の第１実施例
に係る検出装置の要部を示す回路構成図、同図ｂ
は電気制御ブロツク図である。(Example) Next, an example of the present invention will be described with reference to the drawings. FIG. 1a is a circuit diagram showing the main parts of a detection device according to the first embodiment of the present invention, and FIG.
is an electrical control block diagram.
検出装置は、直列に接続した流入流量調整オリ
フイス１０、被検出物９に向けて空気を流出させ
る検出オリフイス１１及び当該検出オリフイス１
１と被検出物９との隙間に対応した背圧を検出す
る圧力検出機構１２を備え、空気用減圧弁１３を
通じて空気が送られ、図示しない検出開始信号発
生手段から発した検出開始信号を受けてタイマが
所定時間の測定を開始し、検出手段が当該タイマ
により測定された所定時間以内に前記圧力検出機
構１２からの設定圧力到達信号の有無を検出し当
該検出結果に対応した信号を出力し、被検出物９
を検出するものである。 The detection device includes an inflow flow rate adjustment orifice 10 connected in series, a detection orifice 11 that causes air to flow out toward the object 9, and the detection orifice 1.
A pressure detection mechanism 12 is provided for detecting a back pressure corresponding to the gap between the detection object 1 and the detected object 9. The timer starts measuring for a predetermined time, and the detection means detects the presence or absence of a set pressure reaching signal from the pressure detection mechanism 12 within the predetermined time measured by the timer, and outputs a signal corresponding to the detection result. , object to be detected 9
This is to detect.
流入流量調整オリフイス１０は、圧縮空気の流
出口径が可変となつており、減圧弁１３を通じて
送り込まれる圧縮空気を流量を調整する。 The inflow flow rate adjusting orifice 10 has a variable outlet diameter for compressed air, and adjusts the flow rate of the compressed air sent through the pressure reducing valve 13.
検出オリフイス１１は、近接する被検出物９に
向けて圧縮空気を噴出させるものである。 The detection orifice 11 blows out compressed air toward an object to be detected 9 in the vicinity.
圧力検出機構１２は、背圧が圧力継電器等によ
り予め設定された所定圧力に達した時のみオンと
され、当該背圧を検出し、その背圧が後述の比較
器１６に入力される。 The pressure detection mechanism 12 is turned on only when the back pressure reaches a predetermined pressure set in advance by a pressure relay or the like, detects the back pressure, and inputs the back pressure to a comparator 16, which will be described later.
空気用減圧弁１３は、ダイヤフラムを内蔵し、
圧縮ばねで当該ダイヤフラムを調整し、送り込ま
れる圧縮空気を減圧して所定の圧力とするもので
ある。 The air pressure reducing valve 13 has a built-in diaphragm,
The diaphragm is adjusted by a compression spring to reduce the pressure of the compressed air sent in to a predetermined pressure.
検出手段としての検出回路１４は、タイマ１５
と比較器１６とを備えている。比較器１６は、圧
力検出機構１２により検出した背圧及びタイマ１
５で測定した所定時間を入力として受け、当該所
定時間が経過した時に前記背圧が予め設定した所
定圧力以上に達すると作動してその旨の電気信号
を出力し、逆に所定圧力に達しない場合には、そ
の旨の電気信号を出力する。 The detection circuit 14 as a detection means has a timer 15.
and a comparator 16. The comparator 16 compares the back pressure detected by the pressure detection mechanism 12 and the timer 1.
It receives the predetermined time measured in step 5 as input, and when the predetermined time elapses and the back pressure reaches a preset predetermined pressure or more, it operates and outputs an electrical signal to that effect, and conversely, if the predetermined pressure is not reached. If so, an electrical signal to that effect is output.
次に、上記第１実施例に係る検出装置の動作に
ついて詳細に説明する。 Next, the operation of the detection device according to the first embodiment will be described in detail.
第２図において、流入流量調整オリフイス１０
を流れる空気量をQ1、検出オリフイス１１を流
れる空気量をQ2、被検出物９が置かれる前の当
初の背圧をP2′、被検出物９が検出オリフイス１
１に対して隙間ｈの状態で置かれてからの経過時
間をΔt、流入流量調整オリフイス１０と検出オ
リフイス１１との間の配管の容積をＶ、被検出物
９が置かれてから時間Δtが経過した後の背圧を
p2とすると、その時の背圧の変化量をΔp2とする
と、
Δp2＝p2−p2′
＝（Q1−Q2）Δt／Ｖ ……(1)
となり、このΔp2が経過時間Δt当りの背圧の圧力
上昇である。 In FIG. 2, the inflow flow rate adjusting orifice 10
Q 1 is the amount of air flowing through the detection orifice 11, Q 2 is the amount of air flowing through the detection orifice 11, P 2 ' is the initial back pressure before the object 9 is placed, and the amount of air flowing through the detection orifice 1 is P 2 '.
1, the elapsed time since the object 9 was placed with a gap h is Δt, the volume of the piping between the inflow flow rate adjustment orifice 10 and the detection orifice 11 is V, and the time Δt has been since the object 9 was placed. back pressure after
If p 2 is the amount of change in back pressure at that time, Δp 2 is Δp 2 = p 2 − p 2 ′ = (Q 1 − Q 2 ) Δt/V (1), and this Δp 2 is It is the pressure increase of back pressure per time Δt.
ここで、Q1は、空気用減圧弁１３の設定圧力
p1、背圧p2及び流入流量調整オリフイス１０の有
効断面積ｓの関数であり、Q2は、p2、大気圧p3
及び隙間ｈの関数であつて、それぞれ
Q1＝ｆ（p1，P2，ｓ） ……(2)
Q2＝ｆ（p2，P3，ｈ） ……(3)
と表わすことができる。従つて、結局背圧の変化
量Δp2は、上記式(1)，(2)及び(3)により、p1，P2，
ｓ，P3，ｈ，Δt及びＶの関数である。しかるに、
ここでは配管の容積Ｖ、供給圧力p1、大気圧p3及
び調整オリフイス１０の有効断面積ｓをそれぞれ
変化させずある一定の設定値に保持すれば、結局
背圧の変化量Δp2は、
Δp2＝ｆ（ｈ，Δt） ……(4)
となる。即ち、Δp2は、隙間ｈ及び経過時間Δtの
みの関数であり、これら隙間ｈ及び経過時間Δt
のみによつて決まる。さらにΔtがある定められ
た値をとる時は、
Δp2＝ｆ（ｈ） ……(5)
となる。 Here, Q 1 is the set pressure of the air pressure reducing valve 13
p 1 , back pressure p 2 and effective cross-sectional area s of the inflow flow regulating orifice 10, Q 2 is a function of p 2 , atmospheric pressure p 3
and the gap h, which can be expressed as Q 1 = f (p 1 , P 2 , s) ...(2) Q 2 = f (p 2 , P 3 , h) ... (3) can. Therefore, the amount of change in back pressure Δp 2 is determined by p 1 , P 2 ,
It is a function of s, P 3 , h, Δt and V. However,
Here, if the volume V of the piping, the supply pressure p 1 , the atmospheric pressure p 3 and the effective cross-sectional area s of the adjusting orifice 10 are held at certain set values without changing them, the amount of change in back pressure Δp 2 will be: Δp 2 =f(h, Δt) ...(4). That is, Δp 2 is a function only of the gap h and the elapsed time Δt;
Depends only on Furthermore, when Δt takes a certain predetermined value, Δp 2 =f(h)...(5).
第３図ａ及びｂは、縦軸にいずれも背圧ｐをと
り、横軸にそれぞれ隙間ｈ及び経過時間ｔをと
り、種々の隙間の大きさにおける背圧と経過時間
との既知の関係を示したグラフであり、それぞれ
上記(5)及び(4)式に基くものである。同図ｂにおい
て、被測定物が置かれてから、経過時間t1後に背
圧が圧力縦電器等で予め設定された所定圧力Ｐ
になれば、隙間はh1、経過時間t2後に所定圧力Ｐ
になれば隙間はh2、経過時間t3後に所定圧力Ｐ
になれば隙間はh3であることを示している。以
上のことから設定圧力になるまでの経過時間をタ
イマ１５で測定することにより、隙間ｈの検出が
可能である。 In Figures 3a and 3b, the back pressure p is plotted on the vertical axis, and the gap h and the elapsed time t are plotted on the horizontal axis, respectively, and the known relationship between the back pressure and the elapsed time for various gap sizes is shown. These graphs are based on the above equations (5) and (4), respectively. In Figure b, after the elapsed time t 1 after the object to be measured is placed, the back pressure is set to a predetermined pressure P, which is set in advance by a pressure electric device, etc.
, the gap is h 1 and the predetermined pressure P after elapsed time t 2
If , the gap is h 2 and the predetermined pressure P after elapsed time t 3
This shows that the gap is h 3 . From the above, by measuring the elapsed time until the set pressure is reached with the timer 15, the gap h can be detected.
第１図ｃは、上記実施例に係る検出装置の動作
を示すタイムチヤートである。第１図ａに示すよ
うに所定位置に設置された検出オリフイス１１に
対して所定の隙間h0の状態で被検出物９が置かれ
た時毎に、被検出物と検出オリフイスとの相対運
動に関連して検出開始信号としてのスタート信号
が入り、所定の経過時間T0を測定するタイマ１
５が作動する。これと同時に、背圧が上昇開始し
所定時間T0が経過した時に、予め設定した所定
圧力Ｐ以上になると、圧力検出機構１２により
背圧の検出がなされ、その検出された背圧の入力
に基き、比較器１６が働き被検出物９が所定の位
置にある旨の電気信号S0を出力するので、被検出
物９が当該所定圧力に対応する隙間ｈの位置にあ
ることを検出することができる。上記と逆に、背
圧が上昇開始し所定時間T0が経過した時までに、
予め設定した所定圧力P0にまで上昇しない場合
には、圧力検出機構１２による背圧の検出がなさ
れることがなく、比較器１６は被検出物９が所定
の位置にない旨の電気信号S1を出力する。なお、
スタート信号が入つた時点S2またはそれ以前のリ
セツト信号により出力信号はリセツトされる。 FIG. 1c is a time chart showing the operation of the detection device according to the above embodiment. As shown in FIG. 1a, each time the detected object 9 is placed with a predetermined gap h0 with respect to the detection orifice 11 installed at a predetermined position, the relative movement between the detected object and the detection orifice occurs. A start signal as a detection start signal is input in connection with timer 1, which measures a predetermined elapsed time T0 .
5 is activated. At the same time, when the back pressure starts to rise and a predetermined time T 0 has elapsed, when the pressure exceeds a preset predetermined pressure P, the pressure detection mechanism 12 detects the back pressure, and the input of the detected back pressure is Based on this, the comparator 16 operates and outputs an electrical signal S0 indicating that the detected object 9 is at a predetermined position, so it is possible to detect that the detected object 9 is at the position of the gap h corresponding to the predetermined pressure. I can do it. Contrary to the above, by the time the back pressure starts to rise and the predetermined time T 0 has elapsed,
If the pressure does not rise to a preset predetermined pressure P0 , the pressure detection mechanism 12 will not detect the back pressure, and the comparator 16 will output an electric signal S indicating that the detected object 9 is not at the predetermined position. Outputs 1 . In addition,
The output signal is reset by the reset signal at or before the time point S2 when the start signal is input.
第４図ａ乃至ｄは本考案の第２実施例に係る検
出装置の要部を示す概略構成図、同図ｂはその電
気制御ブロツク図、同図ｃはその動作を示すタイ
ムチヤート、同図ｄはその背圧変化の開始からの
経過時間ｔを横軸にとり縦軸に背圧をとつてこれ
ら両者の関係を表わしたグラフである。 4a to 4d are schematic configuration diagrams showing the main parts of a detection device according to a second embodiment of the present invention, FIG. 4b is an electrical control block diagram thereof, and FIG. 4c is a time chart showing its operation. d is a graph showing the relationship between the two, with the horizontal axis representing the elapsed time t from the start of the back pressure change and the vertical axis representing the back pressure.
この場合、第１の圧力検出機構１９と、第２の
圧力検出機構２０とを調整オリフイス１０と検出
オリフイス１１との中間に並列的に接続し、ま
た、検出手段としての検出回路２１中に前記比較
器１６に代えて演算器２２を採用し、第１の圧力
検出機構１９で検出した背圧と別に第２の圧力検
出機構２０で検出した背圧がタイマ１５を通じて
演算器２２へ入力される点が前述の第１実施例の
場合と異なつた構成になつているが、その他の構
成は前記第１実施例の場合と同じである。 In this case, the first pressure detection mechanism 19 and the second pressure detection mechanism 20 are connected in parallel between the adjustment orifice 10 and the detection orifice 11, and the detection circuit 21 as a detection means is connected in parallel. An arithmetic unit 22 is used in place of the comparator 16, and the back pressure detected by the second pressure detection mechanism 20 is input to the arithmetic unit 22 through the timer 15 in addition to the back pressure detected by the first pressure detection mechanism 19. Although the configuration differs from that of the first embodiment described above in this point, the other configurations are the same as those of the first embodiment.
第１の圧力検出機構１９は所定圧力に設定さ
れ、第２の圧力検出機構２０はそれよりも高い所
定圧力に設定されており、それぞれそれらの所定
圧力に達した時にはじめてオンとされ作動して背
圧を検出し、その背圧が演算器２２に入力される
ようになつている。 The first pressure detection mechanism 19 is set to a predetermined pressure, and the second pressure detection mechanism 20 is set to a higher predetermined pressure, and is turned on and activated only when the respective predetermined pressures are reached. Back pressure is detected and the back pressure is input to the calculator 22.
演算器２２は第１の圧力検出機構１９及び第２
の圧力検出機構２０の両者から入力される背圧の
信号の有無に対応してそれを電気信号として変換
出力するものである。 The computing unit 22 is connected to the first pressure detection mechanism 19 and the second pressure detection mechanism 19.
The back pressure signal is converted and output as an electrical signal depending on the presence or absence of a back pressure signal input from both of the pressure detection mechanisms 20.
この場合検出オリフイス１１に対して隙間h1の
状態にて被検出物９が置かれると、第４図ｄに示
す曲線ｃの如く、経過時間ｔとともに背圧が上昇
し、背圧が、第１の圧力検出機構１９により予め
設定された所定圧力P1に対応する同図のａ点に
達すると、第１の圧力検出機構１９がオンとされ
るとともにタイマ１５もオンとされる。そして更
に背圧が上昇し、設定時間T0以内の経過時間T1
にて第２の圧力検出機構２０によつて予め設定さ
れた所定圧力P2に対応する同図のｂ点に達する
と、第２の圧力検出機構２０がオンとされ、同図
ｂに示す演算器２２にその背圧の信号が伝えら
れ、被検出物９が所定位置にあることを示す電気
信号S0が出力される。 In this case, when the object 9 to be detected is placed with a gap h 1 relative to the detection orifice 11, the back pressure increases with the elapsed time t, as shown by the curve c shown in FIG. When a point a in the figure corresponding to a predetermined pressure P 1 preset by the first pressure detection mechanism 19 is reached, the first pressure detection mechanism 19 is turned on and the timer 15 is also turned on. Then, the back pressure increases further, and the elapsed time T 1 within the set time T 0
When point b in the figure corresponding to the predetermined pressure P 2 preset by the second pressure detection mechanism 20 is reached, the second pressure detection mechanism 20 is turned on and the calculation shown in b in the figure is performed. The signal of the back pressure is transmitted to the device 22, and an electric signal S0 indicating that the object 9 to be detected is at a predetermined position is output.
第４図ａにおいて、被検出物９が所定位置から
外れて検出オリフイス１１に対して隙間h2で置か
れると、同図ｄに示す曲線ｄに沿つて背圧が上昇
する。そして第１の圧力検出機構１９により予め
設定された所定圧力P1に対応する同図のａ点に
達すると、第１の圧力検出機構１９がオンとされ
るとともにタイマ１５もオンとされる。背圧はさ
らに上昇するが、隙間がh1の時よりも背圧の上昇
が遅いので、所定圧力P2に達するまでに経過時
間T2を要し、背圧がタイマ１５の同図ｄに示す
設定時間T0までには、第２の圧力検出機構２０
により予め設定した所定圧力P2に達せず第２の
圧力検出機構２０がオフのままとなり、演算器２
２に背圧の信号が伝わらず、従つて、演算器２２
から被検出物９が所定の位置にない旨の信号S1が
出力される。なお、第１の圧力検出機構１９がオ
ンとされた時点S2またはそれ以前のリセツト信号
によつて、出力信号はリセツトされる。 In FIG. 4a, when the object 9 to be detected is removed from the predetermined position and placed with a gap h2 relative to the detection orifice 11, the back pressure increases along the curve d shown in FIG. 4d. When a point a in the figure corresponding to a predetermined pressure P1 preset by the first pressure detection mechanism 19 is reached, the first pressure detection mechanism 19 is turned on and the timer 15 is also turned on. The back pressure increases further, but since the increase in back pressure is slower than when the gap is h 1 , it takes an elapsed time T 2 to reach the predetermined pressure P 2 , and the back pressure reaches the timer 15 (d) in the figure. By the set time T 0 shown, the second pressure detection mechanism 20
As a result, the predetermined pressure P 2 is not reached and the second pressure detection mechanism 20 remains off, causing the calculator 2
2, the back pressure signal is not transmitted to the computing unit 22.
A signal S1 indicating that the object to be detected 9 is not at the predetermined position is output from the sensor. Note that the output signal is reset by a reset signal at or before time S2 when the first pressure detection mechanism 19 is turned on.
第５図ａは、本考案に第３実施例に係る検出装
置の要部を示す回路構成図、同図ｂは、その電気
制御ブロツク図である。 FIG. 5a is a circuit diagram showing the main parts of a detection device according to a third embodiment of the present invention, and FIG. 5b is an electrical control block diagram thereof.
この場合、検出装置は、第１実施例に示す検出
装置に対して、減圧弁１３と流入流量調整オリフ
イス１０との間に接続した二方切換弁２３を備え
ており、被検出物９の検出を行う時のみ当該二方
切換弁２３がオンとされ減圧弁１３以外にこの二
方切換弁２３を通じて空気が送られ、検出が行わ
れる点が前記第１実施例の場合と異なり、その他
の構成は第１実施例の場合と同じである。 In this case, the detection device differs from the detection device shown in the first embodiment in that it is equipped with a two-way switching valve 23 connected between the pressure reducing valve 13 and the inflow flow rate regulating orifice 10 to detect the detected object 9. This is different from the first embodiment in that the two-way switching valve 23 is turned on only when performing the above-mentioned operation, and air is sent through this two-way switching valve 23 other than the pressure reducing valve 13 to perform detection. is the same as in the first embodiment.
第５図ｃは、第３実施例に係る検出装置の動作
を示すタイムチヤートである。第５図ａに示すよ
うに、所定位置に設置された検出オリフイス１１
に対して隙間ｈの状態で被検出物が置かれている
場合、スタート信号を入れると、そのスタート信
号に連動して二方切換弁２３がオンとされ、所定
の経過時間T0を測定するタイマが作動する。こ
れと同時に、背圧が上昇開始し所定時間T0が経
過した時に、予め設定した所定圧力Ｐ以上にな
ると、圧力検出機構１２により背圧の検出がなさ
れ、その検出された背圧の入力に基き、比較器１
６が働き被検出物９が所定の位置にある旨の電気
信号S0を出力するので、被検出物９が当該所定圧
力に対応する隙間ｈの位置にあることを検出する
ことができる。上記と逆に、背圧が上昇開始し所
定時間T0が経過した時までに、予め設定した所
定圧力Ｐにまで上昇しない場合には、圧力検出
機構１２による背圧の検出がなされることがな
く、比較器１６は被検出物９が所定の位置にない
旨の電気信号S1を出力する。なお、検出開始信号
が入つた時点S2またはそれ以前のリセツト信号に
より出力信号はリセツトされる。 FIG. 5c is a time chart showing the operation of the detection device according to the third embodiment. As shown in FIG. 5a, the detection orifice 11 is installed at a predetermined position.
When the object to be detected is placed with a gap h between the two and the start signal is input, the two-way switching valve 23 is turned on in conjunction with the start signal, and a predetermined elapsed time T 0 is measured. The timer runs. At the same time, when the back pressure starts to rise and a predetermined time T 0 has elapsed, when the pressure exceeds a preset predetermined pressure P, the pressure detection mechanism 12 detects the back pressure, and the input of the detected back pressure is Base, comparator 1
6 works and outputs an electric signal S 0 indicating that the detected object 9 is at a predetermined position, it is possible to detect that the detected object 9 is located at the gap h corresponding to the predetermined pressure. Contrary to the above, if the back pressure does not rise to the preset predetermined pressure P by the time the predetermined time T 0 elapses after the back pressure starts to rise, the pressure detection mechanism 12 may not detect the back pressure. Therefore, the comparator 16 outputs an electric signal S1 indicating that the detected object 9 is not at the predetermined position. Note that the output signal is reset by a reset signal at or before time S2 when the detection start signal is input.
なお、上記各検出回路は電気信号に代えて空気
信号を出力するものを用いてもよいものである。 Note that each of the above-mentioned detection circuits may be one that outputs an air signal instead of an electric signal.
（考案の効果）
本考案に係る検出装置は、上述の如く構成さ
れ、被検出物と検出オリフイスとの相対動作に関
連させて検出開始信号を発する検出開始信号発生
手段と、前記検出開始信号を受けて所定時間の測
定を開始するタイマと、該タイマにより測定され
た前記所定時間以内に前記圧力検出機構からの設
定圧力到達信号の有無を検出し被検出結果に対応
した信号を出力する検出手段とを設けたことによ
り、当該タイマを用いて短時間の測定をするのみ
でしかも小さい検出誤差で被検出物を検出するこ
とが可能である。(Effect of the invention) The detection device according to the invention is configured as described above, and includes a detection start signal generating means that generates a detection start signal in relation to the relative movement between the detected object and the detection orifice, and a timer that starts measurement for a predetermined time when the timer receives the signal, and a detection means that detects the presence or absence of a set pressure reaching signal from the pressure detection mechanism within the predetermined time measured by the timer and outputs a signal corresponding to the detected result. By providing this, it is possible to detect an object with a small detection error by only performing short-term measurement using the timer.
第１図ａは本考案の第１実施例に係る検出装置
の要部を示す回路構成図、同図ｂは電気制御ブロ
ツク図、同図ｃはタイムチヤート、第２図は同上
に係る動作説明用の概略構成図、第３図ａ及びｂ
は種々の隙間の大きさにおける背圧と経過時間と
の関係を示すグラフ、第４図ａは本考案の第２実
施例に係る検出装置の要部を示す概略構成図、同
図ｂはその電気制御ブロツク図、同図ｃはそのタ
イムチヤート、同図ｄは背圧変化の開始からの経
過時間と背圧との関係を表わしたグラフ、第５図
ａは本考案の第３実施例に係る検出装置の要部を
示す概略構成図、同図ｂはその電気制御ブロツク
図、同図ｃはそのタイムチヤート、第６図ａ乃至
ｄは従来の検出装置のそれぞれ別個の例を示す概
略構成図、第７図は検出オリフイスを示す縦断面
図、第８図は隙間と背圧との関係を示すグラフ、
第９図ａ及びｂはそれぞれ隙間及び経過時間と背
圧との関係を示すグラフである。
９……被検出物、１０……流入流量調整オリフ
イス、１１……検出オリフイス、１２……圧力検
出機構、１４……検出回路、１５……タイマ、１
６……比較器、１９……第１の圧力検出機構、２
０……第２の圧力検出機構、２１……検出回路、
２２……演算器、２３……二方切換弁。
Fig. 1a is a circuit configuration diagram showing the main parts of the detection device according to the first embodiment of the present invention, Fig. 1b is an electrical control block diagram, Fig. 1c is a time chart, and Fig. 2 is an explanation of the operation related to the above. Schematic diagram of the system, Figure 3 a and b
4 is a graph showing the relationship between back pressure and elapsed time for various gap sizes, FIG. The electric control block diagram, Figure 5(c) is its time chart, Figure 5(d) is a graph showing the relationship between the elapsed time from the start of the back pressure change and the back pressure, and Figure 5(a) is the third embodiment of the present invention. A schematic configuration diagram showing the main parts of such a detection device, FIG. 6B is an electrical control block diagram thereof, FIG. 6C is a time chart thereof, and FIGS. 7 is a vertical cross-sectional view showing the detection orifice, and FIG. 8 is a graph showing the relationship between the gap and back pressure.
FIGS. 9a and 9b are graphs showing the relationship between the gap, elapsed time, and back pressure, respectively. 9...Object to be detected, 10...Inflow flow rate adjustment orifice, 11...Detection orifice, 12...Pressure detection mechanism, 14...Detection circuit, 15...Timer, 1
6... Comparator, 19... First pressure detection mechanism, 2
0...Second pressure detection mechanism, 21...Detection circuit,
22...Arithmetic unit, 23...Two-way switching valve.
Claims (1)
流出させる検出オリフイス及び該検出オリフイス
と被検出物との隙間に対応した背圧を検出する圧
力検出機構を備えた背圧式の検出装置において、
前記被検出物と前記検出オリフイスとの相対動作
に関連させて検出開始信号を発する検出開始信号
発生手段と、前記検出開始信号を受けて所定経過
時間の測定を開始するタイマと、該タイマにより
測定された前記所定経過時間以内に前記圧力検出
機構からの設定圧力到達信号の有無を検出し該検
出結果に対応した信号を出力する検出手段とを設
けたことを特徴とする検出装置。 In a back pressure type detection device equipped with a flow rate adjustment orifice, a detection orifice that causes air to flow out toward an object to be detected, and a pressure detection mechanism that detects a back pressure corresponding to a gap between the detection orifice and the object to be detected,
a detection start signal generating means for generating a detection start signal in relation to relative movement between the detected object and the detection orifice; a timer for starting measurement of a predetermined elapsed time upon receiving the detection start signal; a detection device for detecting the presence or absence of a set pressure attainment signal from the pressure detection mechanism within the predetermined elapsed time of the detection, and outputting a signal corresponding to the detection result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP753287U JPH0416235Y2 (en) | 1987-01-23 | 1987-01-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP753287U JPH0416235Y2 (en) | 1987-01-23 | 1987-01-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63115776U JPS63115776U (en) | 1988-07-26 |
| JPH0416235Y2 true JPH0416235Y2 (en) | 1992-04-10 |
Family
ID=30791075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP753287U Expired JPH0416235Y2 (en) | 1987-01-23 | 1987-01-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0416235Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017007027A (en) * | 2015-06-22 | 2017-01-12 | アズビルＴａｃｏ株式会社 | Seating determination method when processing work |
-
1987
- 1987-01-23 JP JP753287U patent/JPH0416235Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63115776U (en) | 1988-07-26 |
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