JP2009063146A - Valve opening degree detection device for actuator, and actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely and quickly mount a valve opening degree detection mechanism, and to detect a valve opening degree at high accuracy, enduring a long-time use without misalignment or slack during use by reducing the number of parts as much as possible and commonly using the parts. <P>SOLUTION: In this valve opening degree detection device for an actuator, a bottom end of an adapter 3 is fixed to a shaft top end of an actuator body, and cylindrical base ends 19 of a pair of cam members 2 are fixed to the top end of the adapter 3 at an appropriate angle. Cam pieces 7, 8 of the pair of cam members 2 are fixed in a substantially same horizontal state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、アクチュエータ用の弁開度検出装置に関し、特に、ボールバルブやバタフライバルブ等の回転弁に用いる空気圧式アクチュエータにおける弁開度検出構造とこの構造を用いたアクチュエータに関する。   The present invention relates to a valve opening degree detecting device for an actuator, and more particularly to a valve opening degree detecting structure in a pneumatic actuator used for a rotary valve such as a ball valve or a butterfly valve and an actuator using this structure.

この種のバルブ用アクチュエータには、大きく分けて電動式と空圧式とがあり、何れも、バルブにアクチュエータを搭載し、駆動軸とバルブのステムとを接続してバルブを全開、全閉と中間開度に作動させたり、流量制御を行うようにしている。   This type of valve actuator is broadly divided into electric type and pneumatic type. In either case, the actuator is mounted on the valve, the drive shaft and the valve stem are connected, and the valve is fully opened, fully closed, and intermediate. The valve is operated at the opening and the flow rate is controlled.

前者の電動式アクチュエータは、ケーシング内に電動モータと減速ギアを設け、減速された駆動力を駆動軸を介してバルブを開閉するように構成されている。特に、開閉の位置制御は位置リミットスイッチで行い、位置決めカムがリミットスイッチ電源を遮断するようにしている（特許文献１参照）。   The former electric actuator is provided with an electric motor and a reduction gear in a casing, and is configured to open and close a valve with a reduced driving force via a drive shaft. In particular, the position control of opening and closing is performed by a position limit switch, and the positioning cam shuts off the limit switch power supply (see Patent Document 1).

このような電動式アクチュエータの場合において、弁開度を検出するには、前記のリミットスイッチを電気信号に変換することにより、遠隔地でも弁開度の位置検出が容易に行い得られる。   In the case of such an electric actuator, in order to detect the valve opening, the position of the valve opening can be easily detected even in a remote place by converting the limit switch into an electric signal.

一方、後者の空気圧式アクチュエータは、シリンダ内にコンプレッサによって作られた圧縮空気を給排気させることによって、シリンダ内に設けたピストンとピストンロッドを往復動させ、このピストンロッドに設けた回転変換機構に接続したバルブ用ステムを回動操作させる構造である（特許文献２参照）。 On the other hand, the latter pneumatic actuator reciprocates the piston and piston rod provided in the cylinder by supplying and exhausting the compressed air produced by the compressor in the cylinder, and the rotation conversion mechanism provided in the piston rod is used. In this structure, the connected valve stem is rotated (see Patent Document 2).

特開平５-１４１５５８号公報JP-A-5-141558 特公平３−２３７９１号公報Japanese Patent Publication No. 3-23791

しかしながら、前者のように、電動式アクチュエータの場合は、電気信号をとり出して弁開度を容易に検出できるが、後者の空気圧式アクチュエータの場合は、特許文献２に示すように、駆動軸をシリンダの上部に延出させ、この延出部にユーザーの要望する弁開度検出装置を後付けしているのが通常である。   However, in the case of an electric actuator, as in the former, an electric signal can be taken out and the valve opening can be easily detected. In the latter pneumatic actuator, as shown in Patent Document 2, the drive shaft is Normally, the valve is extended to the upper part of the cylinder, and a valve opening degree detecting device desired by the user is retrofitted to the extended part.

この弁開度検出機構は、延出部の径に応じた種類のリミットスイッチ用カムを固着しているので、対応するスイッチの種類だけカムの種類も必要となり、その上、このカムはプラント等の運転中に緩み、作動不良の不具合を起こすおそれもあり、カムの不具合により生ずる作動不良の解消が要求されている。   Since this valve opening degree detection mechanism has a limit switch cam of a type corresponding to the diameter of the extension, it is necessary to have the same type of cam as the corresponding switch type. There is also a risk that it will loosen during operation and cause malfunctions, and it is required to eliminate malfunctions caused by cam malfunctions.

また、通常のリミットスイッチ用カムは、全開、全閉用であるため、中間開度の開度調整機構を使用する要求の場合、中間開度設定機構が別に必要となり、そのため、中間位置の検出対応も複雑化している。   In addition, since a normal limit switch cam is fully open and fully closed, if an intermediate opening adjustment mechanism is required, an intermediate opening setting mechanism is required separately. The correspondence is also complicated.

本発明は、上記問題点を解決するために開発したものであって、その目的とするところは、部品点数を極力低減して部品を共通化し、弁開度検出機構を確実かつ迅速に取付けることを可能とし、使用中にも芯ズレや緩みが生ずることなく長期間の使用にも耐え得る、高精度な弁開度検出を可能とするアクチュエータ用弁開度検出装置を提示することにある。   The present invention has been developed to solve the above-mentioned problems, and the object of the present invention is to reduce the number of parts as much as possible, to make parts common, and to install the valve opening degree detection mechanism reliably and quickly. It is an object of the present invention to provide a valve opening degree detection device for an actuator that enables highly accurate valve opening degree detection that can withstand long-term use without causing misalignment or loosening during use.

上記目的を達成するため請求項１に係る発明は、アクチュエータ本体のシャフト上端部にアダプタの下端部を固定し、このアダプタの上端部に一対のカム部材の円筒形基端部を適宜の角度で固定すると共に、一対のカム部材のカム片を略同一水平状態に固定したアクチュエータ用弁開度検出装置である。   In order to achieve the above object, according to the first aspect of the present invention, the lower end of the adapter is fixed to the upper end of the shaft of the actuator body, and the cylindrical base ends of the pair of cam members are attached to the upper end of the adapter at an appropriate angle. This is an actuator valve opening detection device in which the cam pieces of the pair of cam members are fixed in substantially the same horizontal state.

請求項２に係る発明は、アクチュエータ本体より突出させたシャフトの上端面にめねじを形成し、一対のカム部材とアダプタより挿通したボルトを前記めねじに螺着して一対のカム部材とアダプタをシャフト上端部に固着したアクチュエータ用弁開度検出装置である。   According to a second aspect of the present invention, a female screw is formed on the upper end surface of the shaft that protrudes from the actuator body, and a pair of cam members and a bolt inserted through the adapter are screwed onto the female screw, thereby the pair of cam members and the adapter. Is an actuator valve opening detection device in which is fixed to the upper end of the shaft.

請求項３に係る発明は、シャフト上端部に形成した係止溝に前記アダプタの下端部に形成した係合部を嵌合係止し、前記アダプタ上端部には、円錐筒と係止凸部を形成し、一方、カム部材の基端部下面のそれぞれには、テーパ筒部と凹溝を形成し、かつ基端部上面には、多数の放射溝を形成し、前記円錐筒をテーパ筒部に嵌合すると共に、前記係止凸部を凹溝に嵌合係止し、かつ、一対のカム部材の基端部に形成した放射溝同士を嵌め合わせて一対のカム部材を固定し、カム部材同士の緩みを防止したアクチュエータ用弁開度検出装置である。   According to a third aspect of the present invention, an engaging portion formed at the lower end portion of the adapter is fitted and locked in a locking groove formed at the upper end portion of the shaft, and a conical cylinder and a locking convex portion are provided at the upper end portion of the adapter. On the other hand, each of the bottom surface of the base end portion of the cam member is formed with a tapered tube portion and a concave groove, and a plurality of radiation grooves are formed on the top surface of the base end portion, and the conical tube is formed as a taper tube. And fitting the locking projections into the concave grooves, and fixing the pair of cam members by fitting the radial grooves formed on the base end portions of the pair of cam members, This is an actuator valve opening degree detection device that prevents loosening between cam members.

請求項４に係る発明は、円筒形の基端部に段差状にカム片を設けてカム部材を構成し、このカム片の基端部側の段部面に円弧状受部を形成し、一対のうち他方のカム部材の基端部の円弧面を支受けさせてカム部材の傾きと芯ズレを防止したアクチュエータ用弁開度検出装置である。   In the invention according to claim 4, a cam member is formed by providing a cam piece in a step shape on a cylindrical base end portion, and an arc-shaped receiving portion is formed on a step surface on the base end portion side of the cam piece, This is an actuator valve opening detection device in which the arc surface of the base end portion of the other cam member of the pair is supported to prevent the cam member from being inclined and misaligned.

請求項５に係る発明は、カム片の先端近傍位置をリミットスイッチ用接点の当接部とし、この当接部に近接スイッチ用の近接スイッチ取付部を設けたアクチュエータ用弁開度検出装置である。   The invention according to claim 5 is the valve opening degree detecting device for an actuator in which the position near the tip of the cam piece is used as the contact portion of the limit switch contact, and the contact switch mounting portion for the proximity switch is provided at the contact portion. .

請求項６に係る発明は、カム片の基端部側に係合角部を形成し、一対のカム部材の係合角部同士を当接させて一対のカム部材を所定の中間開度に設定可能としたアクチュエータ用弁開度検出装置である。   According to a sixth aspect of the present invention, an engagement angle portion is formed on the base end side of the cam piece, and the engagement corner portions of the pair of cam members are brought into contact with each other so that the pair of cam members have a predetermined intermediate opening degree. It is a valve opening degree detection device for an actuator that can be set.

請求項７に係る発明は、シャフトの突出部の高さと前記突出部上端部に形成しためねじ寸法等をＮＡＭＵＲ規格に設定したアクチュエータ用弁開度検出装置である。   The invention according to claim 7 is the valve opening degree detecting device for an actuator in which the height of the protruding portion of the shaft and the screw size and the like are formed at the upper end portion of the protruding portion and set to the NAMUR standard.

請求項８に係る発明は、アクチュエータ本体のシャフト上端部にアダプタの下端部を固定し、このアダプタの上端部に一対のカム部材の円筒形基端部を適宜の角度で固定すると共に、一対のカム部材のカム片を略同一水平状態に固定した弁開度検出装置を配置したアクチュエータである。   In the invention according to claim 8, the lower end portion of the adapter is fixed to the upper end portion of the shaft of the actuator body, and the cylindrical base end portions of the pair of cam members are fixed to the upper end portion of the adapter at an appropriate angle. This is an actuator provided with a valve opening degree detection device in which the cam pieces of the cam member are fixed in substantially the same horizontal state.

したがって、請求項１における発明によると、従来のように、例えば空気圧アクチュエータに対応したリミットスイッチ用のカム機構をそれぞれ別個に用意することなく、一対のカム部材とアダプタを用意するのみで、最小の部品点数で各種のアクチュエータに即座に対応することが可能となる。また、アクチュエータのシャフト径にも影響を受けることなく、対応可能であるため、従来に比して極めて実用的価値の高い検出機構を提供できる。更に、一対のカム部材のカム片を略同一水平状に固定することができ、スイッチング機構を高精度の作動が可能であり、しかも、カム同士を単に重ねることなく、嵩張ることがないので検出装置全体の高さや大きさを抑えることができ、コンパクト化に寄与できる。   Therefore, according to the first aspect of the present invention, as in the prior art, for example, without preparing separate cam mechanisms for limit switches corresponding to pneumatic actuators, it is only necessary to prepare a pair of cam members and adapters. It is possible to respond immediately to various actuators by the number of parts. In addition, since it can be handled without being affected by the shaft diameter of the actuator, it is possible to provide a detection mechanism having a very high practical value as compared with the prior art. Furthermore, the cam pieces of the pair of cam members can be fixed substantially in the same horizontal state, the switching mechanism can be operated with high accuracy, and the cams do not simply overlap each other, so that the detection device is not bulky. The overall height and size can be reduced, contributing to downsizing.

請求項２における発明によると、一対のカム部材とアダプタとボルト結合により確実にカム機構を固定でき、かつ規格対応も可能である。更に、アクチュエータ本体のシャフトと直接固定されるので、弁開度を正確に検出することができる。   According to the second aspect of the present invention, the cam mechanism can be reliably fixed by a pair of cam members, an adapter, and bolts, and the standards can be met. Furthermore, since it is directly fixed to the shaft of the actuator body, the valve opening can be accurately detected.

請求項３における発明によると、一対のカム機構は、適宜の角度に、しかも、緩みを防止した状態で固定でき、かつ、シャフト上端部にアダプタを確実に固着できると共に、アダプタと一対のカム部材も迅速にかつ確実に固定でき、使用中に緩みが生じるおそれが全くない弁開度検出装置を提供できる。更に、一対のカム部材に設けた放射溝同士を嵌め合わせて、迅速かつ確実に一対のカム部材を所望の角度に調整することができ、弁開閉度を適宜の角度で設定できる。   According to the invention of claim 3, the pair of cam mechanisms can be fixed at an appropriate angle and in a state of preventing looseness, and the adapter can be securely fixed to the upper end of the shaft, and the adapter and the pair of cam members In addition, it is possible to provide a valve opening degree detecting device that can be quickly and reliably fixed and that does not cause any looseness during use. Furthermore, the radial grooves provided on the pair of cam members can be fitted together to quickly and reliably adjust the pair of cam members to a desired angle, and the valve opening / closing degree can be set at an appropriate angle.

請求項４における発明によると、一対のカム部材は円弧状受部と円筒面で支受けされているので、一対のカム部材はみだりに傾いたり芯ズレを生じるおそれがない。また、円筒形基端部の内周面をテーパ状にしたことにより、アダプタとカム部材の基端部はくさび状に嵌合して確実に固定されると共に、カム部材とアダプタの凹溝と凸部の嵌合も確実に行われ、カム部材とアダプタとは、軸ズレを発生することなく、簡易に接続することができる。   According to the invention of claim 4, since the pair of cam members are supported by the arcuate receiving portion and the cylindrical surface, there is no possibility that the pair of cam members will be tilted or misaligned. In addition, since the inner peripheral surface of the cylindrical base end portion is tapered, the base end portion of the adapter and the cam member are fitted and securely fixed in a wedge shape, and the cam member and the concave groove of the adapter are fixed. The protrusions are also securely fitted, and the cam member and the adapter can be easily connected without causing an axial shift.

請求項５における発明によると、カム部材のカム片はリミットスイッチ接点に当接する当接部とし、また、これを近接スイッチに用いる場合は、カム片の先端部に近接スイッチ用の近接体を取付ければ良く、もって、各種のスイッチ構造に対応可能となり、実用的価値が極めて大きい。   According to the invention of claim 5, the cam piece of the cam member is a contact portion that contacts the limit switch contact, and when this is used for a proximity switch, a proximity switch proximity member is attached to the tip of the cam piece. Therefore, various switch structures can be used, and the practical value is extremely large.

請求項６における発明によると、一対のカム部材の基端部側が当接する位置で例えば、最小中間開度に自動的に設定でき、更に、放射溝同士を嵌め合わせて、一対のカム部材を所定の角度に調整することができるので、従来のように角度調整に時間と手間がかかることはない。   According to the sixth aspect of the present invention, for example, the minimum intermediate opening can be automatically set at the position where the base end sides of the pair of cam members abut, and the pair of cam members are fixed by fitting the radiation grooves together. Therefore, the angle adjustment does not take time and effort as in the prior art.

請求項７における発明によると、シャフト上端部の高さやシャフト上面のめねじ寸法等がＮＡＭＵＲ（ナムール）規格に対応した弁開度検出機構であり、もって商品価値が高い。   According to the seventh aspect of the present invention, the height of the upper end of the shaft, the internal thread dimension of the upper surface of the shaft, and the like is a valve opening degree detection mechanism corresponding to the NAMUR standard, and thus has a high commercial value.

請求項８における発明によると、空気圧アクチュエータに対応したリミットスイッチ用のカム機構をそれぞれ別個に用意することなく、一対のカム部材とアダプタを用意するのみで、最小の部品点数で各種のアクチュエータに即座に対応することが可能となるアクチュエータを提供できる。   According to the eighth aspect of the present invention, without preparing separate cam mechanisms for limit switches corresponding to pneumatic actuators, it is possible to instantly apply various actuators with a minimum number of parts by preparing only a pair of cam members and adapters. It is possible to provide an actuator that can cope with the above.

本発明における、アクチュエータ用弁開度検出装置における実施形態を図面に基いて詳述する。
図１は、同検出装置の要部を示した分解斜視図であり、図４は検出装置を組み付けた部分断面図である。また、図７〜１１は、本発明における検出装置を搭載した空気圧式アクチュエータを示した各種の実施形態をそれぞれ示した図である。 An embodiment of an actuator valve opening detection device in the present invention will be described in detail with reference to the drawings.
FIG. 1 is an exploded perspective view showing a main part of the detection device, and FIG. 4 is a partial sectional view in which the detection device is assembled. 7 to 11 are diagrams showing various embodiments showing a pneumatic actuator equipped with the detection device of the present invention.

図４において、アクチュエータ本体１の上部に、シャフト上端部４を延出させ、この上端部４は、ＮＡＭＵＲ規格に対応した構造であって、同図に示すように、シャフト上端部４の高さｔ、めねじ部２７の寸法等を規格に対応させている。
更には、シャフト上端部４は、図４及び図５に示すように切削面４ａを有する略四角柱の形状を成し、上端部４の軸方向には、ボルト１１を螺入するための、めねじ部２７が設けられており、これらもＮＡＭＵＲ規格に対応させている。また、上端部４の上端面に係止溝２６を形成し、後述するアダプタ３の下部に形成した係合部１４と係合するようにしている。 In FIG. 4, the upper end portion 4 of the shaft is extended to the upper portion of the actuator body 1, and this upper end portion 4 has a structure corresponding to the NAMUR standard, and as shown in FIG. t, the dimensions of the female thread portion 27, and the like are made to correspond to the standard.
Furthermore, the shaft upper end portion 4 has a substantially quadrangular prism shape having a cutting surface 4a as shown in FIGS. 4 and 5, and the bolt 11 is screwed into the axial direction of the upper end portion 4. A female thread portion 27 is provided, and these also correspond to the NAMUR standard. Further, a locking groove 26 is formed in the upper end surface of the upper end portion 4 so as to engage with an engaging portion 14 formed in the lower portion of the adapter 3 described later.

図中３は、アダプタであり、このアダプタ３は、図３に示すよう、略円筒形を成し、アダプタ３の軸方向には、ボルト１１を挿通する挿通孔３ａが形成され、アダプタ３の下端部に凸状の係合部１４を形成し、上端部には上端面の径より小径の基部を有し、この基部より円錐状の円錐筒２１を突設させている。更に、アダプタ３に設けた円錐筒２１の基部である外周段差面には、前記係合部１４と直交状態に突設した係止凸部２２を形成している。   In the figure, reference numeral 3 denotes an adapter. The adapter 3 has a substantially cylindrical shape as shown in FIG. 3, and an insertion hole 3 a through which the bolt 11 is inserted is formed in the axial direction of the adapter 3. A convex engagement portion 14 is formed at the lower end portion, and a base portion having a diameter smaller than that of the upper end surface is formed at the upper end portion, and a conical conical cylinder 21 is projected from the base portion. Further, a locking convex portion 22 is formed on the outer peripheral step surface which is the base portion of the conical cylinder 21 provided in the adapter 3 so as to protrude perpendicularly to the engaging portion 14.

図２において、２はカム部材であり、このカム部材２は、円筒形の基端部１９とこの基端部１９の一方側に段差状に一体に形成したカム片７（８）より構成されている。前記基端部１９は、その外周面に円弧面２０を、内周面にテーパ筒部１３を形成し、このテーパ筒部１３の下端には、本例では直交状の凹溝１２を形成している。一方、この基端部１９の上面には、挿通孔１９ａを中心に放射状に形成した放射溝１８を形成している。この放射溝１８は、基端部１９の上面に所定の放射角度をもって多数本形成され、この放射溝１８同士を嵌め合わせることにより、一対のカム部材２を適宜の角度に設置できるようにしている。   In FIG. 2, reference numeral 2 denotes a cam member. The cam member 2 includes a cylindrical base end portion 19 and a cam piece 7 (8) integrally formed in a step shape on one side of the base end portion 19. ing. The base end portion 19 has an arcuate surface 20 on its outer peripheral surface and a tapered cylindrical portion 13 on its inner peripheral surface. An orthogonal concave groove 12 is formed on the lower end of the tapered cylindrical portion 13 in this example. ing. On the other hand, on the upper surface of the base end portion 19, there are formed radial grooves 18 that are formed radially around the insertion hole 19a. A plurality of the radiating grooves 18 are formed on the upper surface of the base end portion 19 with a predetermined radiating angle, and the pair of cam members 2 can be installed at an appropriate angle by fitting the radiating grooves 18 together. .

前述したカム片７と基端部１９との段差面には、円弧状受部１６が形成され、更に、この円弧状受部１６の両端角部には、係合角部１７、１７を形成している。このカム片７、８は、例えば、鋳物等の金属又は樹脂製等で形成され、また、このカム片７、８は、枠形状に形成して軽量化を図っている。カム片７の先端近傍には、リミットスイッチ用の当接部２ａを設け、更にその先端面には、近接スイッチ等の近接体２３を取付けるための、取付部１５を設けている。本例においては、取付部１５は、カム片７、８の枠体の先端に取付孔をあけて取付部としている。   An arc-shaped receiving portion 16 is formed on the step surface between the cam piece 7 and the base end portion 19 described above, and engagement corner portions 17 and 17 are formed at both corners of the arc-shaped receiving portion 16. is doing. The cam pieces 7 and 8 are formed of, for example, a metal such as a casting or a resin, and the cam pieces 7 and 8 are formed in a frame shape to reduce the weight. A contact portion 2a for a limit switch is provided in the vicinity of the distal end of the cam piece 7, and an attachment portion 15 for attaching a proximity body 23 such as a proximity switch is provided on the distal end surface thereof. In this example, the attachment portion 15 is formed as an attachment portion by opening an attachment hole at the tip of the frame of the cam pieces 7 and 8.

図７〜図１１において、図中５、１０はリミットスイッチであり、６、９はスイッチ片である。また、図１０において、２４は近接スイッチ、２５は取付部材である。   7 to 11, reference numerals 5 and 10 are limit switches, and reference numerals 6 and 9 are switch pieces. In FIG. 10, 24 is a proximity switch, and 25 is a mounting member.

次に、本発明における検出装置の作用について説明する。
図４、図５においてシャフト上端部４の係止溝２６にアダプタ３の係合部１４を嵌合係止し、次いで、アダプタ３の円錐筒２１にカム部材２のテーパ筒部１３をくさび状に嵌合すると共にアダプタ３の係止凸部２２にカム部材２の凹溝１２を嵌合係止して、一対のうちの一方のカム部材２を図８に示すように、アクチュエータ本体１の長さ方向に向けて取付け、一対のうちの他方のカム部材２を上記カム部材２の下面を上面にして、一方のカム部材２の放射溝１８に他方のカム部材２の放射溝１８同士を嵌め合わせて一対のカム部材２、２を取付け固定する。最後に、図４に示すように、ボルト１１をカム部材２、２の基端部１９に形成された挿通孔１９ａより挿通させると共に、アダプタ３の挿通孔３ａを介して、このボルト１１をシャフト上端部４のめねじに螺着して一対のカム部材２、２とアダプタ３をシャフト上端部４に確実に、かつ堅固に固着する。この一対のカム部材２、２は、同一部材で、共通部品である。 Next, the operation of the detection device according to the present invention will be described.
4 and 5, the engaging portion 14 of the adapter 3 is fitted and locked in the locking groove 26 of the shaft upper end portion 4, and then the tapered cylindrical portion 13 of the cam member 2 is wedge-shaped on the conical cylinder 21 of the adapter 3. 8 and the engaging groove 22 of the cam member 2 is engaged and engaged with the engaging convex portion 22 of the adapter 3, so that one of the cam members 2 of the pair of the actuator body 1 as shown in FIG. The other cam member 2 of the pair is mounted with the lower surface of the cam member 2 as the upper surface, and the radial grooves 18 of the other cam member 2 are connected to the radial grooves 18 of the other cam member 2. The pair of cam members 2 and 2 are attached and fixed together. Finally, as shown in FIG. 4, the bolt 11 is inserted through an insertion hole 19 a formed in the base end portion 19 of the cam members 2, 2, and the bolt 11 is inserted into the shaft through the insertion hole 3 a of the adapter 3. The pair of cam members 2, 2 and the adapter 3 are securely and firmly fixed to the shaft upper end portion 4 by being screwed onto the female screw of the upper end portion 4. The pair of cam members 2 and 2 are the same member and are common parts.

この場合、カム片７、８と基端部１９の段差面に形成した一方のカム片７の円弧状受部１６に、他方のカム部材２の基端部１９の円弧面２０とが確実に当接して一対のカム部材２、２は支受状態に保持されるので、一対のカム部材２、２の組立てに際して、傾きと芯ズレを確実に防ぐことができる。特に、カム部材２、２を組立てたり、分解時の再組立てに際して、カム部材２、２は、傾くことなく自動的に正位置にセットされ高精度な組立てができ、極めて実用的価値が高い。   In this case, the arc-shaped receiving portion 16 of one cam piece 7 formed on the step surface of the cam pieces 7 and 8 and the base end portion 19 is surely connected to the arc surface 20 of the base end portion 19 of the other cam member 2. Since the paired cam members 2 and 2 are held in contact with each other, tilting and misalignment can be reliably prevented when the paired cam members 2 and 2 are assembled. In particular, when the cam members 2 and 2 are assembled or reassembled at the time of disassembly, the cam members 2 and 2 are automatically set in the normal position without being inclined, and can be assembled with high accuracy, and have extremely high practical value.

図７、８における検出構造は、１点式リミットスイッチ５、１０を２個用いた弁開位置と中間位置を検出する装置を示している。本例では、一方のカム部材２をアクチュエータ本体１の長さ方向にセットし、他方のカム部材２を４５°の位置に設置して中間位置検出用のカムとしている。この中間位置の角度は実施に応じて適宜の角度に設置するものとする。   The detection structure in FIGS. 7 and 8 shows a device for detecting the valve opening position and the intermediate position using two one-point limit switches 5 and 10. In this example, one cam member 2 is set in the length direction of the actuator body 1, and the other cam member 2 is installed at a 45 ° position to serve as an intermediate position detecting cam. The angle of the intermediate position is set to an appropriate angle depending on the implementation.

同図から明らかなように、カム部材２、２は基端部１９とカム片７、８とが段差状に形成されて、一対のカム部材２、２における基端部１９同士を嵌め合わされているので、図４、図７に示すように、カム部材２、２のカム片７、８は略同一水平状態に固定されるため、カム部材２、２はリミットスイッチ５、１０のスイッチ片６、９に水平状態に対向して取付けられ、高精度なスイッチング機能を発揮する。   As is clear from the figure, the cam members 2 and 2 have a base end portion 19 and cam pieces 7 and 8 formed in a step shape, and the base end portions 19 of the pair of cam members 2 and 2 are fitted together. 4 and 7, since the cam pieces 7 and 8 of the cam members 2 and 2 are fixed in substantially the same horizontal state, the cam members 2 and 2 are the switch pieces 6 of the limit switch 5 and 10. , 9 facing the horizontal state and exhibiting a highly accurate switching function.

上記のように、本発明におけるカム部材２は、基端部１９とカム片７、８とを段差状に形成しており、一対のカム部材２、２を基端部１９の上面同士が対向する状態で積層することにより、カム片７、８を略同一水平状態に配置することができる。
したがって、カム片７、８によって作動するリミットスイッチ５、１０（スイッチ片６、９）も略同一水平状態に配置することができるので、リミットスイッチ５、１０の高さをそれぞれ変えたり、リミットスイッチ同士を積層する必要はなく、検出装置全体の高さや大きさを抑えることができる。 As described above, in the cam member 2 according to the present invention, the base end portion 19 and the cam pieces 7 and 8 are formed in a stepped shape, and the upper surfaces of the base end portion 19 are opposed to the pair of cam members 2 and 2. By laminating in such a state, the cam pieces 7 and 8 can be arranged in substantially the same horizontal state.
Therefore, since the limit switches 5 and 10 (switch pieces 6 and 9) operated by the cam pieces 7 and 8 can be arranged in substantially the same horizontal state, the heights of the limit switches 5 and 10 can be changed respectively. There is no need to laminate each other, and the height and size of the entire detection device can be suppressed.

図９は、２点内蔵リミットスイッチの例を示したもので、前述のように、一方のカム部材２をアクチュエータ本体１の長さ方向にセットし、他方のカム部材２を中間位置検出用のカム部材２として利用している例である。本例においては、例えば、４５度の中間位置検出用を示している。   FIG. 9 shows an example of a two-point built-in limit switch. As described above, one cam member 2 is set in the length direction of the actuator body 1 and the other cam member 2 is used for detecting an intermediate position. In this example, the cam member 2 is used. In this example, for example, an intermediate position detection of 45 degrees is shown.

この場合、カム片７、８の基端部１９の円弧状受部１６の両端位置に係合角部１７を形成し、一対のカム部材２、２の係合角部１７、１７同士を当接させると、一対のカム部材２を所定の中間開度に設定可能としている。
本例では、カム部材２、２の係合角部１７の接触位置は、中間開度（本例では４５°）の最小検出角となるように設定しているので、係合角部１７、１７同士を接触させると、自動的に中間開度に設定される。なお、この係合角部１７の接触面は、テーパ面とすると角度が更に正確に検出しやすい。 In this case, engagement corners 17 are formed at both end positions of the arcuate receiving portion 16 of the base end portion 19 of the cam pieces 7, 8, and the engagement corners 17, 17 of the pair of cam members 2, 2 are brought into contact with each other. When contacted, the pair of cam members 2 can be set to a predetermined intermediate opening.
In this example, the contact position of the engagement corner 17 of the cam members 2 and 2 is set to be the minimum detection angle of the intermediate opening (45 ° in this example). When 17 are brought into contact with each other, the intermediate opening is automatically set. If the contact surface of the engagement corner portion 17 is a tapered surface, the angle can be detected more accurately.

図１０、図１１は、本発明における検出装置に、近接スイッチを取り付けた例を示したものである。
同図において、カム片７、８の先端に形成した取付部１５に、例えば、近接スイッチ用の近接体２３を取付け、アクチュエータ本体１の上端に取付部材２５を介して取付けた近接スイッチ２４により弁開位置又は中間位置を検出するようにしている。本例においても、上述と同様に一対のカム部材２、２同士を取付けることにより、カム片７、８が水平状態になるように自動的にセットされる。 10 and 11 show an example in which a proximity switch is attached to the detection device of the present invention.
In the figure, for example, a proximity switch 23 is attached to a mounting portion 15 formed at the tip of the cam pieces 7, 8, and the proximity switch 24 is attached to the upper end of the actuator body 1 via a mounting member 25. An open position or an intermediate position is detected. Also in this example, the cam pieces 7 and 8 are automatically set to be in a horizontal state by attaching the pair of cam members 2 and 2 to each other in the same manner as described above.

以上のように、本発明のアクチュエータ用弁開度検出装置によれば、従来の弁開度検出装置に比べ大幅に部品点数を減らすことができ、且つカム部材の芯ズレや緩み等を防止することができ、更にカム部材の角度調整が容易で迅速にできることとなり、また、シャフト上端部と上端部に形成しためねじ寸法がＭＡＭＵＲ規格に適応しおり、実用的価値が極めて高いアクチュエータ用弁開度検出装置を提供できる。 As described above, according to the valve opening degree detection device for an actuator of the present invention, the number of parts can be greatly reduced as compared with the conventional valve opening degree detection device, and the center deviation or loosening of the cam member can be prevented. In addition, the angle of the cam member can be adjusted easily and quickly. Also, because it is formed at the upper end and the upper end of the shaft, the screw dimensions conform to the MAMUR standard, and the valve opening for the actuator is extremely high in practical value. A detection device can be provided.

本発明の弁開度検出装置の分解斜視図である。It is a disassembled perspective view of the valve opening degree detection apparatus of this invention. （ａ）はカム部材の平面図である。（ｂ）は図（ａ）のＡＡ断面図である。（ｃ）はカム部材の底面図である。(A) is a top view of a cam member. (B) is AA sectional drawing of a figure (a). (C) is a bottom view of the cam member. （ａ）はアダプタの平面図である。（ｂ）は図（ａ）のＢＢ断面図である。（ｃ）は、アダプタの底面図である。(A) is a top view of an adapter. (B) is BB sectional drawing of a figure (a). (C) is a bottom view of the adapter. 本発明の弁開度検出装置の一部切欠き要部拡大断面図である。It is a partially notched principal part expanded sectional view of the valve opening degree detection apparatus of this invention. シャフト上端部の一部拡大概略図である。It is a partially enlarged schematic view of the upper end portion of the shaft. シャフト上端部の概略平面図である。It is a schematic plan view of the upper end part of a shaft. 本発明の弁開度検出装置を１点式のリミットスイッチを用いた空気圧式アクチュエータに搭載した状態を示す正面図である。It is a front view which shows the state which mounted the valve opening degree detection apparatus of this invention in the pneumatic actuator using the 1-point type limit switch. 図７に記載のアクチュエータが作動した状態の平面図である。FIG. 8 is a plan view of a state where the actuator described in FIG. 7 is activated. 本発明の弁開度検出装置を２点式のリミットスイッチを用いた空気圧式アクチュエータに搭載した状態を示す正面図である。It is a front view which shows the state which mounted the valve opening degree detection apparatus of this invention in the pneumatic actuator using the two-point type limit switch. 本発明の弁開度検出装置に近接スイッチを用いた空気圧式アクチュエータに搭載した状態を示す正面図である。It is a front view which shows the state mounted in the pneumatic actuator which used the proximity switch for the valve opening degree detection apparatus of this invention. 図１０に記載のアクチュエータが作動した状態の平面図である。It is a top view of the state which the actuator described in FIG. 10 act | operated.

符号の説明Explanation of symbols

１ アクチュエータ本体１
２ カム部材
２ａ 当接部
３ アダプタ
３ａ 挿通孔
４ シャフト上端部
５、１０リミットスイッチ
６、９ スイッチ片
７、８ カム片
１１ ボルト
１２ 凹溝
１３ テーパ筒部
１４ 係合部
１５ 取付部
１６ 円弧状受部
１７ 係合角部
１８ 放射溝
１９ 基端部
１９ａ 挿通孔
２０ 円弧面
２１ 円錐筒
２２ 係止凸部
２３ 近接体
２４ 近接スイッチ
２５ 取付部材
２６ 係止溝
２７ めねじ部 1 Actuator body 1
2 Cam member 2a Contact part 3 Adapter 3a Insertion hole 4 Shaft upper end part 5, 10 Limit switch 6, 9 Switch piece 7, 8 Cam piece 11 Bolt 12 Groove 13 Tapered cylinder part 14 Engagement part 15 Attachment part
DESCRIPTION OF SYMBOLS 16 Arc-shaped receiving part 17 Engagement angle part 18 Radiation groove 19 Base end part 19a Insertion hole 20 Arc surface 21 Conical cylinder 22 Locking convex part 23 Proximity body 24 Proximity switch 25 Mounting member 26 Locking groove 27 Female thread part

Claims (8)

アクチュエータ本体のシャフト上端部にアダプタの下端部を固定し、このアダプタの上端部に一対のカム部材の円筒形基端部を適宜の角度で固定すると共に、一対のカム部材のカム片を略同一水平状態に固定したことを特徴とするアクチュエータ用弁開度検出装置。   The lower end portion of the adapter is fixed to the upper end portion of the shaft of the actuator body, the cylindrical base end portions of the pair of cam members are fixed to the upper end portion of the adapter at an appropriate angle, and the cam pieces of the pair of cam members are substantially the same. An actuator valve opening detection device characterized by being fixed in a horizontal state. 前記アクチュエータ本体より突出させたシャフトの上端面にめねじを形成し、一対のカム部材とアダプタより挿通したボルトを前記めねじに螺着して一対のカム部材とアダプタをシャフト上端部に固着した請求項１に記載のアクチュエータ用弁開度検出装置。   A female screw is formed on the upper end surface of the shaft protruding from the actuator body, and a pair of cam members and a bolt inserted from the adapter are screwed to the female screw to fix the pair of cam members and the adapter to the upper end portion of the shaft. The actuator valve opening degree detection device according to claim 1. 前記シャフト上端部に形成した係止溝に前記アダプタ本体の下端部に形成した係合部を嵌合係止し、前記アダプタ上端部には、円錐筒と係止凸部を形成し、一方、カム部材の基端部下面のそれぞれには、テーパ筒部と凹溝を形成し、かつ基端部上面には、多数の放射溝を形成し、前記円錐筒をテーパ筒部に嵌合すると共に、前記係止凸部を凹溝に嵌合係止し、かつ、一対のカム部材の基端部に形成した放射溝同士を嵌め合わせて一対のカム部材を固定し、カム部材同士の緩みを防止した請求項１又は２のいずれか１項に記載のアクチュエータ用弁開度検出装置。   The engaging groove formed on the lower end portion of the adapter body is fitted and locked in the locking groove formed on the upper end portion of the shaft, and the conical cylinder and the locking convex portion are formed on the adapter upper end portion, Each of the bottom surface of the base end portion of the cam member is formed with a tapered tube portion and a concave groove, and a plurality of radiation grooves are formed on the top surface of the base end portion, and the conical tube is fitted to the taper tube portion. The locking projections are fitted and locked in the concave grooves, and the radial grooves formed in the base end portions of the pair of cam members are fitted together to fix the pair of cam members, thereby loosening the cam members. The valve opening degree detection apparatus for actuators of any one of Claim 1 or 2 which prevented. 前記円筒形の基端部に段差状にカム片を設けてカム部材を構成し、このカム片の基端部側の段部面に円弧状受部を形成し、一対のうち他方のカム部材の基端部の円弧面を支受けさせてカム部材の傾きと芯ズレを防止した請求項１乃至３のいずれか１項に記載のアクチュエータ用弁開度検出装置。   A cam member is formed by providing a cam piece in a step shape at the base end portion of the cylindrical shape, an arc-shaped receiving portion is formed on a stepped surface on the base end portion side of the cam piece, and the other cam member of the pair The valve opening degree detection device for an actuator according to any one of claims 1 to 3, wherein the arc surface of the base end portion of the cam member is supported to prevent the cam member from being inclined and misaligned. 前記カム片の先端近傍位置をリミットスイッチ用接点の当接部とし、この当接部に近接スイッチ用の近接体取付部を設けた請求項１乃至４のいずれか１項に記載のアクチュエータ用弁開度検出装置。   The actuator valve according to any one of claims 1 to 4, wherein a position near the tip of the cam piece is used as a contact portion for a limit switch contact, and a proximity body mounting portion for a proximity switch is provided at the contact portion. Opening detection device. 前記カム片の基端部側に係合角部を形成し、一対のカム部材の係合角部同士を当接させて一対のカム部材を所定の中間開度に設定可能とした請求項１乃至５のいずれか１項に記載のアクチュエータ用弁開度検出装置。   2. An engagement angle portion is formed on the base end side of the cam piece, and the engagement corner portions of the pair of cam members are brought into contact with each other so that the pair of cam members can be set to a predetermined intermediate opening. The valve opening degree detection device for an actuator according to any one of claims 1 to 5. 前記シャフトの突出部の高さと前記突出部上端部に形成しためねじ寸法等をＮＡＭＵＲ規格に設定した請求項１乃至６のいずれか１項に記載のアクチュエータ用弁開度検出装置。   The actuator valve opening degree detecting device according to any one of claims 1 to 6, wherein a screw dimension and the like are set to a NAMUR standard to be formed at a height of the protruding portion of the shaft and an upper end portion of the protruding portion. アクチュエータ本体のシャフト上端部にアダプタの下端部を固定し、このアダプタの上端部に一対のカム部材の円筒形基端部を適宜の角度で固定すると共に、一対のカム部材のカム片を略同一水平状態に固定した弁開度検出装置を配置したことを特徴とするアクチュエータ。   The lower end portion of the adapter is fixed to the upper end portion of the shaft of the actuator body, the cylindrical base end portions of the pair of cam members are fixed to the upper end portion of the adapter at an appropriate angle, and the cam pieces of the pair of cam members are substantially the same. An actuator comprising a valve opening degree detection device fixed in a horizontal state.

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