JP2616783B2 - Hydraulic cylinder piston position detector - Google Patents
Hydraulic cylinder piston position detectorInfo
- Publication number
- JP2616783B2 JP2616783B2 JP62288092A JP28809287A JP2616783B2 JP 2616783 B2 JP2616783 B2 JP 2616783B2 JP 62288092 A JP62288092 A JP 62288092A JP 28809287 A JP28809287 A JP 28809287A JP 2616783 B2 JP2616783 B2 JP 2616783B2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder tube
- position detector
- guide member
- fixed
- guide groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2892—Means for indicating the position, e.g. end of stroke characterised by the attachment means
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Actuator (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、油圧シリンダ、エアーシリンダ等の流体圧
シリンダのピストン位置をシリンダチユーブの外側から
検出する装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a piston position of a hydraulic cylinder such as a hydraulic cylinder or an air cylinder from outside a cylinder tube.
従来の技術及び発明が解決しようとする問題点 従来、シリンダチユーブを非磁性材料製にしてその中
を摺動するピストンの外周に永久磁石を取付けるととも
に、シリンダチユーブの外周の任意の位置にリードスイ
ツチや磁気抵抗素子等の磁気に感応して電気信号を発す
る磁気センサを内蔵した位置検出体を取付けて、ピスト
ンの接近を検出するようにしたピストン位置検出装置は
公知であるが、その位置検出子をバンドまたは特殊な金
具によつてシリンダチユーブの外周に直に締め付けるよ
うになつていたため、位置検出子が移動しないように強
く締め付けると、その締付力により位置検出子が破損す
ることがあり、また、油圧シリンダでは作動油の温度が
100〜200℃程度に上昇することがあるが、このような場
合に、磁気センサが高温にさらされて検出精度が低下す
る欠点があつた。2. Description of the Related Art Conventionally, a cylinder tube is made of a non-magnetic material, a permanent magnet is mounted on an outer periphery of a piston that slides in the cylinder tube, and a lead switch is provided at an arbitrary position on the outer periphery of the cylinder tube. A piston position detecting device that detects a close proximity of a piston by mounting a position detecting body incorporating a magnetic sensor that emits an electric signal in response to magnetism such as a magnetic sensor or a magnetoresistive element is known. Was fastened directly to the outer circumference of the cylinder tube with a band or special metal fittings.If the position detector was strongly tightened so as not to move, the tightening force could damage the position detector. In the case of hydraulic cylinders, the temperature of hydraulic oil
Although the temperature may rise to about 100 to 200 ° C., in such a case, the magnetic sensor is exposed to a high temperature, and there is a disadvantage that the detection accuracy is reduced.
問題点を解決するための手段 本発明はこのような問題点を解決するための手段とし
て、シリンダチユーブを非磁性材料製とし、そのシリン
ダチユーブ内を摺動するピストンに永久磁石を固着し、
シリンダチユーブの両端に固着されたヘッドカバーとロ
ッドカバーに取付溝を形成してその取付溝に、内部が拡
幅した案内溝の形成された非磁性材料からなる案内部材
をシリンダチユーブの軸方向と平行にして嵌入すること
によりそのシリンダチユーブとの間に断熱材を介入させ
て固定し、永久磁石の磁気に感応して電気信号を発する
磁気センサを内蔵した位置検出子を案内部材の案内溝に
嵌入してその位置検出子に植設したボルトを案内溝から
突出し、そのボルトに蝶ナットを螺合してその位置検出
子を案内部材の任意の位置に固定する構成とした。Means for Solving the Problems The present invention, as means for solving such problems, is to make the cylinder tube a non-magnetic material, and to fix a permanent magnet to a piston that slides in the cylinder tube,
A mounting groove is formed in the head cover and the rod cover fixed to both ends of the cylinder tube, and a guide member made of a non-magnetic material having a guide groove whose inside is widened is formed in the mounting groove in parallel with the axial direction of the cylinder tube. Insulation is interposed and fixed between the cylinder tube and the cylinder tube, and a position detector incorporating a magnetic sensor that emits an electric signal in response to the magnetism of the permanent magnet is inserted into the guide groove of the guide member. Then, a bolt implanted in the position detector is projected from the guide groove, and a wing nut is screwed into the bolt to fix the position detector at an arbitrary position on the guide member.
発明の作用及び効果 本発明は上記構成になり、位置検出子をバンド等によ
つてシリンダチユーブに直に締め付けるのではなく、位
置検出子の上面にボルトを植設し、シリンダチユーブに
固設した内部が拡幅した案内溝を有する案内部材に蝶ナ
ットにより固定する構成としたから、ねじ止め等の手段
によつて位置検出子に大きな力を作用させずにしっかり
としかも工具なしで容易に固定することでき、また、固
定位置の調節を容易に行なうことができるとともに、案
内部材をヘッドカバーとロッドカバーに形成した取付溝
に嵌入してシリンダチユーブとの間に断熱材を介入させ
て固定したからシリンダチユーブから位置検出子への熱
の伝達を阻止することができて、温度による検出精度の
低下を回避することができる効果がある。Operation and Effect of the Invention The present invention has the above-mentioned structure, and instead of directly fastening the position detector to the cylinder tube with a band or the like, a bolt is implanted on the upper surface of the position detector and fixed to the cylinder tube. Since it is configured to be fixed to a guide member having a guide groove with a widened inside by a wing nut, it can be fixed firmly and easily without tools without applying a large force to the position detector by means such as screwing. In addition, the fixing position can be easily adjusted, and the guide member is fitted into the mounting groove formed in the head cover and the rod cover, and is fixed by interposing a heat insulating material between the cylinder tube and the cylinder. It is possible to prevent the transmission of heat from the tube to the position detector, and to prevent the detection accuracy from being lowered by the temperature.
実施例 以下、本発明の一実施例を添付図面に基いて説明す
る。Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
図において、１は油圧シリンダであつて、アルミニウ
ム、非磁性ステンレス等の非磁性材料製のシリンダチユ
ーブ２内に同じく非磁性材料からなる２枚の円板４を重
ねてその間にリング形の永久磁石５を挟んだピストン３
が、緊密、かつ、摺動自由に嵌入されてピストンロツド
６の端部に形成したねじ部７に嵌着され、そのねじ部７
に螺着されたナツト８、８によりピストンロツド６に締
め付けられ、シリンダチユーブ２の一端に、ポート11の
形成されたヘツドカバー９が、他端にポート12の形成さ
れたロツドカバー10が、夫々、披着されて４本のタイロ
ツド13により結合されており、ピストンロツド６はロツ
ドカバー10の中心孔14を緊密に貫通している。In the drawing, reference numeral 1 denotes a hydraulic cylinder, in which a cylinder tube 2 made of a non-magnetic material such as aluminum or non-magnetic stainless steel is stacked with two discs 4 also made of a non-magnetic material, and a ring-shaped permanent magnet is interposed therebetween. Piston 3 sandwiching 5
Is tightly and slidably fitted into a screw portion 7 formed at the end of the piston rod 6, and the screw portion 7
A nut cover 8 is screwed to the piston rod 6, and a head cover 9 having a port 11 formed at one end of the cylinder tube 2 and a rod cover 10 having a port 12 formed at the other end. The piston rod 6 is tightly penetrated through the center hole 14 of the rod cover 10 by being connected by four tie rods 13.
この油圧シリンダ１のヘッドカバー９とロツドカバー
10の上線には互いに対応する位置に取付溝15、15が形成
され、その取付溝15、15に、内部が拡幅した案内溝17の
形成された非磁性材料からなる長尺の案内部材16がシリ
ンダチユーブ２との間に隙間を空けて差し渡されて嵌着
され、皿小ねじ18により固定されており、この案内部材
16とシリンダチユーブ２の間及び、ヘツドカバー９とロ
ツドカバー10の間には断熱材19が介装されていて、この
案内部材16には２個の位置検出子20が任意の位置に固定
されるようになつている。The head cover 9 and the rod cover of the hydraulic cylinder 1
Mounting grooves 15 and 15 are formed at positions corresponding to each other on the upper line of 10, and a long guide member 16 made of a non-magnetic material in which a guide groove 17 whose inside is widened is formed in the mounting grooves 15 and 15. The guide member is inserted over the cylinder tube 2 with a gap provided therebetween, and is fixed by a flat head screw 18.
A heat insulating material 19 is interposed between the cylinder tube 2 and the head tube 9 and between the head cover 9 and the rod cover 10. The guide member 16 has two position detectors 20 fixed at arbitrary positions. It has become.
位置検出子20は、第３図に拡大して示すように、合成
樹脂製のケース21内に、リードスイツチや磁気抵抗素子
等の磁気センサ23、発光ダイオード24及び制御装置25、
26がこれらを取付けた基板22とともに収容され、発光ダ
イオード24の頂部がケース21の上面に突出し、基板22に
接続されたリード線28がケース21の外に引き出されてお
り、ケース21内の隙間には合成樹脂27が注入されてい
る。ケース21の上面には案内部材16の案内溝17の開口部
17aに略緊密に嵌合する突部21aが形成され、その中央部
の内面には四角形の凹部21cを有するボス21bが形成さ
れ、四角形の頭部31を凹部21cに嵌合して回転の阻止さ
れたボルト30がケース21cの突部21aの上方へ突出してい
る。As shown in an enlarged manner in FIG. 3, the position detector 20 includes a magnetic sensor 23 such as a lead switch and a magnetoresistive element, a light emitting diode 24 and a control device 25 in a case 21 made of synthetic resin.
26 are housed together with the board 22 to which these are attached, the top of the light emitting diode 24 protrudes from the upper surface of the case 21, and the lead wire 28 connected to the board 22 is drawn out of the case 21. Is injected with a synthetic resin 27. The opening of the guide groove 17 of the guide member 16 is provided on the upper surface of the case 21.
A protrusion 21a that fits approximately tightly with 17a is formed, and a boss 21b having a square concave portion 21c is formed on the inner surface of the central portion, and the square head 31 is fitted into the concave portion 21c to prevent rotation. The bolt 30 protrudes above the protrusion 21a of the case 21c.
この位置検出子20は案内部材16の案内溝17に端面から
挿入され、ケース21の突部21aが案内溝17の開口部17aに
嵌合し、その上面に植設されたボルト30が開口部17aか
ら案内部材16の上方へ突出し、その突出部に、案内部材
16の上面に当たる座金32が嵌装され、その上に蝶ナツト
33が螺合されていて、ナツト33を緩めた状態で案内部材
16に沿つて摺動させ、所望の位置で蝶ナツト33を締め付
けると、座金32とケース21の間で案内部材16の開口部17
aの両側縁を挟んで固定され、リード線28は案内溝17内
を通つてその一端の開口から引き出される。The position detector 20 is inserted into the guide groove 17 of the guide member 16 from the end face, the protrusion 21a of the case 21 fits into the opening 17a of the guide groove 17, and the bolt 30 implanted on the upper surface thereof has the opening. Projecting from the guide member 16 from 17a, the guide member
A washer 32 is fitted on the upper surface of 16 and a butterfly nut is placed on it.
33 is screwed and the guide member with the nut 33 loosened
When the butterfly nut 33 is tightened at a desired position by sliding along the guide 16, the opening 17 of the guide member 16 is provided between the washer 32 and the case 21.
The lead wire 28 passes through the inside of the guide groove 17 and is pulled out from the opening at one end thereof.
本実施例のピストン位置検出装置は上記構成になり、
ピストン３の移動により、これに固着した永久磁石５が
位置検出子20の磁気センサ23の直下に対応すると、この
磁気センサ23がリードスイツチである場合には永久磁石
５の磁力により接点が接触し、また、磁気抵抗素子であ
る場合には電気抵抗が変化して、制御装置25、26から検
出信号が発され、その信号がリード線28を経て図示しな
いリレーや他のアクチユエータの駆動回路に入れされて
これらが作動すると同時に発光ダイオード24が点灯する
ようになつている。The piston position detecting device of the present embodiment has the above configuration,
If the permanent magnet 5 fixed to the piston 3 corresponds to the position immediately below the magnetic sensor 23 of the position detector 20 by the movement of the piston 3, when the magnetic sensor 23 is a lead switch, the contacts come into contact by the magnetic force of the permanent magnet 5. In the case of a magnetoresistive element, the electric resistance changes, and a detection signal is generated from the control devices 25 and 26, and the signal is input to a drive circuit of a relay (not shown) or another actuator via a lead wire 28. Then, the light emitting diode 24 is turned on at the same time as these are operated.
本実施例においては、案内部材16の案内溝17内に位置
検出子20を嵌入し、そのケース21に植設したボルト30に
蝶ナツト33を螺合したから、蝶ナツト33を暖めることに
より位置検出子20を案内部材16に沿つて自由に移動して
位置を調節することができ、蝶ナツト33を締め付けるだ
けで容易にその位置に固定することが可能であり、ま
た、その締付力はケース21の上面の突部21aに作用する
だけであつて位置検出子20の全体を挟圧するようには作
用しないから、その締付力により位置検出子20が破損す
るおそれがなく、さらに、案内部材16とシリンダチユー
ブ２及びヘツドカバー９とロツドカバー10との間に断熱
材19を介装したから、シリンダチユーブ２内の作動油の
温度が上昇し、シリンダチユーブ２及び両カバー９、10
が加熱されても位置検出子20の温度上昇が抑制されて磁
気センサ23の精度低下が防止され、さらにまた、リード
線28を案内溝17内に通すようにしたから配線が容易であ
る等の利点がある。In the present embodiment, the position detector 20 is fitted into the guide groove 17 of the guide member 16 and the butterfly nut 33 is screwed into the bolt 30 planted in the case 21, so that the position is increased by warming the butterfly nut 33. The position of the detector 20 can be adjusted by freely moving the detector 20 along the guide member 16, and it is possible to easily fix the detector 20 at that position simply by tightening the butterfly nut 33. Since it only acts on the protrusion 21a on the upper surface of the case 21 and does not act to pinch the entire position detector 20, there is no possibility that the position detector 20 may be damaged by the tightening force. Since the heat insulating material 19 is interposed between the member 16 and the cylinder tube 2 and between the head cover 9 and the rod cover 10, the temperature of the hydraulic oil in the cylinder tube 2 rises and the cylinder tube 2 and the two covers 9, 10 are raised.
Even if is heated, the temperature rise of the position detector 20 is suppressed and the accuracy of the magnetic sensor 23 is prevented from lowering.Furthermore, since the lead wire 28 is passed through the guide groove 17, the wiring is easy. There are advantages.
第１図は本発明の一実施例の断面図、第２図は分解斜
視図、第３図は検出子の拡大断面図である。1 is a sectional view of an embodiment of the present invention, FIG. 2 is an exploded perspective view, and FIG. 3 is an enlarged sectional view of a detector.
第１図は本発明の一実施例の断面図、第２図は分解斜視
図、第３図は検出子の拡大断面図である。 1:油圧シリンダ、2:シリンダチユーブ、3:ピストン、5:
永久磁石、6:ピストンロツド、9:ヘツドカバー、10:ロ
ツドカバー、15:取付溝、16:案内部材、17:案内溝、19:
断熱材、20:位置検出子、21:ケース、22:基板、23:磁気
センサ、24:発光ダイオード、28:リード線、30:ボル
ト、32:座金、33:蝶ナツト1 is a sectional view of an embodiment of the present invention, FIG. 2 is an exploded perspective view, and FIG. 3 is an enlarged sectional view of a detector. 1: hydraulic cylinder, 2: cylinder tube, 3: piston, 5:
Permanent magnet, 6: piston rod, 9: head cover, 10: rod cover, 15: mounting groove, 16: guide member, 17: guide groove, 19:
Insulation material, 20: Position detector, 21: Case, 22: Substrate, 23: Magnetic sensor, 24: Light emitting diode, 28: Lead wire, 30: Bolt, 32: Washer, 33: Butterfly nut
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭54−40981（ＪＰ，Ａ) 特開 昭62−173111（ＪＰ，Ａ) 実開 昭61−149805（ＪＰ，Ｕ) 実開 昭57−24305（ＪＰ，Ｕ) 実開 昭62−34450（ＪＰ，Ｕ) 実開 昭57−11314（ＪＰ，Ｕ) 特公 昭47−46840（ＪＰ，Ｂ１) 実公 昭46−7121（ＪＰ，Ｙ１) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-40981 (JP, A) JP-A-62-173111 (JP, A) Fully open Showa 61-149805 (JP, U) Really open show 57- 24305 (JP, U) JP-A 62-34450 (JP, U) JP-A 57-11314 (JP, U) JP-B 47-46840 (JP, B1) JP-B 46-7121 (JP, Y1)
Claims (1)
シリンダチユーブ内を摺動するピストンに永久磁石を固
着し、前記シリンダチユーブの両端に固着されたヘッド
カバーとロッドカバーに取付溝を形成して該取付溝に、
内部が拡幅した案内溝の非磁性材料からなる案内部材を
前記シリンダチユーブの軸方向と平行にして嵌入するこ
とにより該シリンダチユーブとの間に断熱材を介入させ
て固定し、前記永久磁石の磁気に感応して電気信号を発
する磁気センサを内蔵した位置検出子を前記案内部材の
前記案内溝に嵌入して該位置検出子に植設したボルトを
前記案内溝から突出し、該ボルトに蝶ナットを螺合して
該位置検出子を前記案内部材の任意の位置に固定する構
成としたことを特徴とする流体圧シリンダのピストン位
置検出装置A cylinder tube is made of a non-magnetic material, a permanent magnet is fixed to a piston sliding in the cylinder tube, and mounting grooves are formed in a head cover and a rod cover fixed to both ends of the cylinder tube. In the mounting groove,
A guide member made of a non-magnetic material of a guide groove having a widened inside is fitted in parallel with the axial direction of the cylinder tube, whereby a heat insulating material is interposed between the tube and the cylinder tube to be fixed. A position detector incorporating a magnetic sensor that emits an electric signal in response to the above is fitted into the guide groove of the guide member, and a bolt implanted in the position detector projects from the guide groove, and a wing nut is attached to the bolt. A piston position detecting device for a hydraulic cylinder, wherein the position detecting element is screwed and fixed at an arbitrary position of the guide member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62288092A JP2616783B2 (en) | 1987-11-13 | 1987-11-13 | Hydraulic cylinder piston position detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62288092A JP2616783B2 (en) | 1987-11-13 | 1987-11-13 | Hydraulic cylinder piston position detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH023702A JPH023702A (en) | 1990-01-09 |
| JP2616783B2 true JP2616783B2 (en) | 1997-06-04 |
Family
ID=17725687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62288092A Expired - Lifetime JP2616783B2 (en) | 1987-11-13 | 1987-11-13 | Hydraulic cylinder piston position detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2616783B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008105228A1 (en) | 2007-02-26 | 2008-09-04 | Fujikura Ltd. | Magnetic sensor module and piston position detecting device |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2539969Y2 (en) * | 1990-03-30 | 1997-07-02 | シーケーデイ 株式会社 | Switch mounting device for detecting piston position of fluid pressure cylinder |
| JPH082484Y2 (en) * | 1990-10-13 | 1996-01-29 | シーケーディ株式会社 | Sensor mounting structure on cylinder |
| JPH0522810U (en) * | 1991-09-04 | 1993-03-26 | エスエムシー株式会社 | Cylinder with sensor mounting mechanism |
| JP2006242341A (en) * | 2005-03-04 | 2006-09-14 | Smc Corp | Actuator equipped with position detecting mechanism |
| JP2008180238A (en) * | 2007-01-23 | 2008-08-07 | Aisin Sangyo Kk | Rotary actuator |
| EP2166312B2 (en) * | 2008-09-18 | 2020-01-15 | Sick Ag | Magnetic or inductive waypoint sensor |
| CN103836024B (en) * | 2014-03-19 | 2016-08-24 | 太原科技大学 | The hollow hydraulic cylinder of built-in sensors |
| CN108506280A (en) * | 2018-04-24 | 2018-09-07 | 孝感鑫财智能科技有限公司 | A kind of hydraulic cylinder device whether exceeding safe handling threshold value by detecting hydraulic cylinder temperature |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5724305U (en) * | 1980-07-16 | 1982-02-08 | ||
| JPS61149805U (en) * | 1985-03-11 | 1986-09-16 |
-
1987
- 1987-11-13 JP JP62288092A patent/JP2616783B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008105228A1 (en) | 2007-02-26 | 2008-09-04 | Fujikura Ltd. | Magnetic sensor module and piston position detecting device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH023702A (en) | 1990-01-09 |
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