JPH0133844Y2 - - Google Patents
Info
- Publication number
- JPH0133844Y2 JPH0133844Y2 JP1982025222U JP2522282U JPH0133844Y2 JP H0133844 Y2 JPH0133844 Y2 JP H0133844Y2 JP 1982025222 U JP1982025222 U JP 1982025222U JP 2522282 U JP2522282 U JP 2522282U JP H0133844 Y2 JPH0133844 Y2 JP H0133844Y2
- Authority
- JP
- Japan
- Prior art keywords
- air
- pressure
- chamber
- valve
- liquid
- 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
Links
- 239000007788 liquid Substances 0.000 claims description 72
- 239000012530 fluid Substances 0.000 description 16
- 238000013459 approach Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- Fluid-Pressure Circuits (AREA)
Description
【考案の詳細な説明】
(a) 考案の目的
（考案の技術分野）
本考案は、空気圧による入力信号に対して、規
制された液圧出力をうるエアハイドロコンバータ
に関し、液室に流入する液体の圧力差による気泡
発生を防止するものである。[Detailed description of the invention] (a) Purpose of the invention (technical field of the invention) The present invention relates to an air-hydro converter that produces a regulated hydraulic output in response to an input signal based on air pressure. This prevents the generation of bubbles due to the pressure difference between the two.
（技術の背景）
空圧シリンダは低速度で作動させると、空気の
圧縮性によつてビビリを生じ、なめらかな運動や
ストローク途中で停止させることが困難である。
このため、エアハイドロコンバータにより空気圧
を液圧に変換して、シリンダを制御することが行
なわれている。(Technical Background) When pneumatic cylinders are operated at low speeds, they chatter due to the compressibility of air, making it difficult to move smoothly or to stop the cylinder mid-stroke.
For this reason, air pressure is converted into hydraulic pressure using an air-hydro converter to control the cylinder.
（従来技術とその問題点）
第１図は、従来のエアハイドロコンバータを備
えた空圧シリンダの断面図である。空圧シリンダ
１のピストン２で仕切られた一方の室（ヘツド側
ピストン室）３には、切換弁SVを介して駆動用
の圧縮空気が導入されて空気室となり、ロツド４
が設けられた他方の室（ロツド側ピストン室）５
には、液体が導入されて液室となつている。液室
となつているロツド側ピストン室５には、ピスト
ン２の速度を制御する液体を満たしたエアハイド
ロコンバータ６が、絞り弁７を介して接続されて
いる。エアハイドロコンバータ６内の液室８上部
は空気室９となつていて、空気室９は切換弁SV
を介して空気圧源Ａに接続されている。(Prior art and its problems) FIG. 1 is a sectional view of a pneumatic cylinder equipped with a conventional air-hydro converter. Compressed air for driving is introduced into one chamber (head side piston chamber) 3 of the pneumatic cylinder 1 partitioned by the piston 2 through the switching valve SV, and becomes an air chamber.
The other chamber (rod side piston chamber) provided with
A liquid is introduced into the chamber to form a liquid chamber. An air-hydro converter 6 filled with a liquid for controlling the speed of the piston 2 is connected to the rod-side piston chamber 5, which serves as a liquid chamber, via a throttle valve 7. The upper part of the liquid chamber 8 in the air-hydro converter 6 is an air chamber 9, and the air chamber 9 is connected to a switching valve SV.
The air pressure source A is connected to the air pressure source A via the air pressure source A.
このようなエアハイドロコンバータ６を備えた
空圧シリンダ１のヘツド側シリンダ室３に、空気
圧源Ａから圧縮空気を供給すると、ピストン２は
押されてピストンロツド４を矢印a1方向へ前進さ
せる。このときロツド側ピストン室５の液体は、
絞り弁７によつて流量を規制されてエアハイドロ
コンバータ６の液室８に流入するため、ピストン
２の移動速度が制御される。 When compressed air is supplied from the air pressure source A to the head side cylinder chamber 3 of the pneumatic cylinder 1 equipped with such an air-hydro converter 6, the piston 2 is pushed and the piston rod 4 is moved forward in the direction of arrow a1 . At this time, the liquid in the rod side piston chamber 5 is
Since the flow rate is regulated by the throttle valve 7 and flows into the liquid chamber 8 of the air-hydro converter 6, the moving speed of the piston 2 is controlled.
ところがピストン前進の際に、ピストンロツド
４に対する負荷が少ないかあるいは無い場合に
は、空気圧が直接液体に伝播して、ロツド側ピス
トン室５の液圧が高圧になる。しかし、エアハイ
ドロコンバータ６の液室８は、上部の空気室９が
切換弁SVを介して大気に開放されているので、
絞り弁７を境にして液圧に大きな差が生じる。こ
の圧力差のため、絞り弁７を通過して液室８に流
入する高圧液体は急激に膨張され、溶けていた空
気が、気泡となつて現われる。この気泡を含もだ
液体がピストン後退時にロツド側ピストン室５に
導入されると、液体の非圧縮性が損なわれている
ので、ピストン動作を確実に制御することができ
なくなる。また、気泡の発生で液体の見掛けの体
積が膨張するので、液体がエアハイドロコンバー
タ６から切換弁SVに逆流して噴出するおそれが
ある。 However, when the piston moves forward, if there is little or no load on the piston rod 4, the air pressure is directly transmitted to the liquid, and the liquid pressure in the rod-side piston chamber 5 becomes high. However, since the upper air chamber 9 of the liquid chamber 8 of the air-hydro converter 6 is open to the atmosphere via the switching valve SV,
A large difference in hydraulic pressure occurs across the throttle valve 7. Due to this pressure difference, the high-pressure liquid passing through the throttle valve 7 and flowing into the liquid chamber 8 is rapidly expanded, and the dissolved air appears as bubbles. If this liquid containing bubbles is introduced into the rod-side piston chamber 5 when the piston is retracted, the incompressibility of the liquid is impaired, making it impossible to reliably control the piston movement. Furthermore, since the apparent volume of the liquid expands due to the generation of bubbles, there is a risk that the liquid will flow back from the air-hydro converter 6 to the switching valve SV and be ejected.
このような問題の解決策として、気泡の発生に
対しては、空圧シリンダ１のピストン往復動サイ
クルの時間を長くして、エアハイドロコンバータ
６内の空気室９に気泡を上昇させて排出してい
る。しかし、往復動サイクルの時間が短かい場合
には、気泡を完全に排出できないので使用目的が
限定されていた。また、体積の増加に対しては、
液室の容積を増大すれば良いが、エアハイドロコ
ンバータ６が大型化して取扱いに不便を来すこと
になる。 As a solution to this problem, the piston reciprocating cycle time of the pneumatic cylinder 1 is lengthened to prevent air bubbles from rising into the air chamber 9 in the air-hydro converter 6. ing. However, when the reciprocating cycle time is short, bubbles cannot be completely discharged, so the purpose of use is limited. Also, for increase in volume,
Although it would be possible to increase the volume of the liquid chamber, the air-hydro converter 6 would become larger and would be inconvenient to handle.
（考案の具体的目的）
本考案は、このような問題を解決するものであ
り、絞り弁を挾んでシリンダ側の液体とエアハイ
ドロコンバータ側の液体との間に圧力差と小さ
く、かつエアハイドロコンバータ側の液圧を低く
することにより、液体の急激な膨張による気泡の
発生を防止することを目的とする。(Specific purpose of the invention) The present invention is to solve such problems, and it is possible to reduce the pressure difference between the liquid on the cylinder side and the liquid on the air-hydro converter side by sandwiching the throttle valve, and to reduce the pressure difference between the air-hydro converter and the air-hydro converter. By lowering the liquid pressure on the converter side, the purpose is to prevent the generation of bubbles due to rapid expansion of the liquid.
(b) 考案の構成
この目的を達成するために本考案は、液室が絞
り弁を介してシリンダに接続され、前記液室上部
の空気室に印加される空気圧によつて前記シリン
ダに圧力液体を供給するエアハイドロコンバータ
において、上記空気室に圧力制御弁を接続すると
共に、該圧力制御弁の圧力作用室を弁体と連動す
る圧力応動体で仕切り、一方の圧力作用室には圧
力応動体を開弁方向へ変位させるように、前記空
気室の空気を導入し、かつ弾性手段を設けると共
に、他方の圧力作用室には圧力応動体を閉弁方向
へ変位させるように、前記シリンダと絞り弁間の
圧力液体を導入する構成を採つている。(b) Structure of the invention In order to achieve this object, the invention provides a system in which a liquid chamber is connected to a cylinder via a throttle valve, and pressure liquid is applied to the cylinder by air pressure applied to an air chamber above the liquid chamber. In an air-hydro converter that supplies a The air in the air chamber is introduced and an elastic means is provided so as to displace the pressure responsive body in the valve opening direction, and the cylinder and the throttle are provided in the other pressure acting chamber so as to displace the pressure responsive body in the valve closing direction. The structure is such that pressure liquid is introduced between the valves.
この構成によれば、無負荷状態等におけるシリ
ンダの排液動作時に、シリンダと絞り弁間の液圧
が上昇すると、液体は絞り弁で液室への流入を規
制されているため、液室の液面が上昇して空気が
圧力制御弁を介して大気に排出される前に、その
液圧が圧力制御弁の圧力応動体に作用して、閉弁
方向へ変位させ弁が閉じられる。このため、空気
の排出が止められて空気室の圧力が上昇し、液室
の液圧を上昇させてシリンダと絞り弁間の液圧に
近づける。 According to this configuration, when the liquid pressure between the cylinder and the throttle valve increases when the cylinder drains liquid under no-load conditions, etc., the flow of liquid into the liquid chamber is regulated by the throttle valve. Before the liquid level rises and air is discharged to the atmosphere through the pressure control valve, the liquid pressure acts on the pressure responsive body of the pressure control valve, displacing it in the valve closing direction and closing the valve. Therefore, the discharge of air is stopped and the pressure in the air chamber increases, causing the hydraulic pressure in the liquid chamber to rise and approach the hydraulic pressure between the cylinder and the throttle valve.
空気圧が上昇してシリンダと絞り弁間の液圧に
近づくと、ダイヤフラムに開弁方向に加えられる
弾性手段と相俟つて、空気圧がシリンダと絞り弁
間の液圧より大となる前に圧力応動体は開弁方向
へ変位され、弁が開放されて空気を排出する。空
気が排出されて、弁室と連通された圧力作用室の
空気圧と弾圧力の合力が他方の圧力作用室の液圧
より小さくなると、圧力応動体が閉弁方向に変位
されて閉弁する。したがつて、空気圧は弾圧力だ
けシリンダと絞り弁間の液圧より低く保たれ、そ
の結果、空気室を上部に備えたエアハイドロコン
バータの液室の液圧も、シリンダと絞り弁間の液
圧より弾性手段の弾圧力だけ低く保たれる。 When the air pressure increases and approaches the hydraulic pressure between the cylinder and the throttle valve, combined with the elastic means applied to the diaphragm in the valve opening direction, the pressure response occurs before the air pressure becomes greater than the hydraulic pressure between the cylinder and the throttle valve. The body is displaced in the valve opening direction, and the valve is opened to discharge air. When the air is discharged and the resultant force of the air pressure and the elastic force in the pressure chamber communicating with the valve chamber becomes smaller than the hydraulic pressure in the other pressure chamber, the pressure responsive body is displaced in the valve closing direction and the valve is closed. Therefore, the air pressure is kept lower than the hydraulic pressure between the cylinder and the throttle valve by the elastic force. The pressure is kept lower by the elastic force of the elastic means.
(c) 考案の効果
このように本考案によれば、シリンダに絞り弁
を介して接続されたエアハイドロコンバータは、
無負荷状態等におけるシリンダ排液動作時に、エ
アハイドロコンバータの液室の液圧とシリンダと
絞り弁間の液圧との差を小さく、かつ液室側の液
圧を低く設定することができる。このため、絞り
弁を通過してシリンダより液室に流入する液体
は、圧力差が小さいため急激な膨張に晒されるこ
とはない。従つて、溶けていた空気が気泡となつ
て現われるのを防止することができる。そのた
め、見掛けの体積が膨張してエアハイドロコンバ
ータから溢れたり、液体の非圧縮性が失なわれ
て、シリンダの制御が不確実になるおそれもな
い。(c) Effect of the invention As described above, according to the invention, the air-hydro converter connected to the cylinder via the throttle valve is
When the cylinder drains liquid in a no-load state or the like, the difference between the liquid pressure in the liquid chamber of the air-hydro converter and the liquid pressure between the cylinder and the throttle valve can be made small, and the liquid pressure on the liquid chamber side can be set low. Therefore, the liquid that passes through the throttle valve and flows into the liquid chamber from the cylinder is not exposed to rapid expansion because the pressure difference is small. Therefore, it is possible to prevent dissolved air from appearing as bubbles. Therefore, there is no risk that the apparent volume will expand and overflow from the air-hydro converter, or that the incompressibility of the liquid will be lost and that the control of the cylinder will become uncertain.
(d) 考案の実施例
次に本考案の一実施例を図に基づいて詳細に説
明する。第２図は本考案によるエアハイドロコン
バータを備えた空圧シリンダの断面図である。図
において、第１図と同じ部分には同一符号が付し
てある。即ち、シリンダ１のヘツド側ピストン室
３は切換弁SVを介して空気圧源Ａに接続され、
ロツド側ピストン室５は、絞り弁７を介してエア
ハイドロコンバータ６の液室８に接続されてい
る。液室８の上部は、空気室９となつており、従
来は切換弁SVを介して空気圧源Ａに接続されて
いたが、本考案においては圧力制御弁PV1を介在
している。圧力制御弁PV1は、本体１０の２つの
流通孔１１，１２間に弁室１３を備えている。こ
の弁室１３内に流通孔１２を開閉する弁１４を備
えており、流通孔１１は前記空気室９に、流通孔
１２は切換弁SVを介して前記空気圧源Ａに接続
されている。本体１０内には、前記弁室１３と共
に、圧力作用室１５が設けられており、圧力応動
体であるダイヤフラム１６によつて２つに仕切ら
れている。ダイヤフラム１６で２つに仕切られた
左側の圧力作用室１５Ｌには、シリンダ１のロツ
ド側ピストン室５と絞り弁７間のシリンダ排出液
体が導入され、右側の圧力作用室１５Ｒは連通孔
１７によつて弁室１３に連通させて空気室９の排
出空気が導入される。そして、圧力作用室１５
Ｌ，１５Ｒを仕切るダイヤフラム１６は、弁棒１
８で弁体１４と連結され、右側の圧力作用室１５
Ｒの空気圧と共に開弁方向に作用するスプリング
１９を備えている。一方、左側の圧力作用室１５
Ｌに流入する液体は、ダイヤフラム１６を閉弁方
向へ変位させる。(d) Embodiment of the invention Next, an embodiment of the invention will be described in detail based on the drawings. FIG. 2 is a sectional view of a pneumatic cylinder equipped with an air-hydro converter according to the present invention. In the figure, the same parts as in FIG. 1 are given the same reference numerals. That is, the head side piston chamber 3 of the cylinder 1 is connected to the air pressure source A via the switching valve SV,
The rod-side piston chamber 5 is connected to a liquid chamber 8 of an air-hydro converter 6 via a throttle valve 7. The upper part of the liquid chamber 8 is an air chamber 9, which was conventionally connected to the air pressure source A via a switching valve SV, but in the present invention, a pressure control valve PV1 is interposed. The pressure control valve PV 1 includes a valve chamber 13 between two communication holes 11 and 12 of the main body 10 . A valve 14 for opening and closing the communication hole 12 is provided in the valve chamber 13, and the communication hole 11 is connected to the air chamber 9, and the communication hole 12 is connected to the air pressure source A via a switching valve SV. Inside the main body 10, a pressure acting chamber 15 is provided together with the valve chamber 13, and is partitioned into two by a diaphragm 16, which is a pressure responsive body. The cylinder discharge liquid between the rod-side piston chamber 5 of the cylinder 1 and the throttle valve 7 is introduced into the left pressure chamber 15L, which is partitioned into two by the diaphragm 16, and the right pressure chamber 15R is connected to the communication hole 17. Therefore, the discharged air from the air chamber 9 is introduced into the valve chamber 13 in communication with the valve chamber 13 . And the pressure action chamber 15
The diaphragm 16 that partitions L and 15R is the valve stem 1.
8 is connected to the valve body 14, and the pressure action chamber 15 on the right side
It is provided with a spring 19 that acts in the valve opening direction together with the air pressure of R. On the other hand, the pressure action chamber 15 on the left side
The liquid flowing into L displaces the diaphragm 16 in the valve closing direction.
第２図の状態において、シリンダ１のヘツド側
ピストン室３に空気圧源Ａから圧縮空気を供給す
ると、ピストン２は押されてピストンロツド４を
矢印a1方向に前進させる。このとき、ピストンロ
ツド４に対する負荷が少ないか、あるいは無い場
合、液圧は絞り弁７を境にして液室８側よりシリ
ンダ１側が高圧となる。その圧力は、圧力制御弁
PV1の左側の圧力作用室１５Ｌに作用し、スプリ
ング１９のバネ圧に抗してダイヤフラム１６を閉
弁方向に変位させ、弁棒１８を介して弁体１４を
流通孔１２に押圧し、空気の流出を阻止する。こ
のため、空気の排出が止められた空気室９の圧力
は上昇し、液室８の液圧も上昇する。液室８側の
液圧の上昇により、シリンダ１の排出液体の液圧
との差が小さくなり、絞り弁７を通過した液体の
急激な膨張は起らず、溶けている空気と気泡とな
ることもない。 In the state shown in FIG. 2, when compressed air is supplied from the air pressure source A to the head side piston chamber 3 of the cylinder 1, the piston 2 is pushed and the piston rod 4 is moved forward in the direction of arrow a1 . At this time, if the load on the piston rod 4 is small or absent, the hydraulic pressure will be higher on the cylinder 1 side than on the liquid chamber 8 side with the throttle valve 7 as a boundary. That pressure is controlled by the pressure control valve
It acts on the pressure chamber 15L on the left side of PV 1 , displaces the diaphragm 16 in the valve closing direction against the spring pressure of the spring 19, presses the valve body 14 into the flow hole 12 via the valve stem 18, and releases air. prevent the outflow of Therefore, the pressure in the air chamber 9 whose air discharge is stopped increases, and the liquid pressure in the liquid chamber 8 also increases. Due to the increase in the liquid pressure on the liquid chamber 8 side, the difference between the liquid pressure and the liquid discharged from the cylinder 1 becomes smaller, and the liquid that has passed through the throttle valve 7 does not expand rapidly and becomes bubbles with the dissolved air. Not at all.
液室８の液圧は、シリンダ１の排出液体の液圧
より高くなるとシリンダ１が作動しなくなるの
で、少し低い圧力に維持される。即ち、ダイヤフ
ラム１６は右側の圧力作用室１５Ｒの空気圧とス
プリング１９のバネ圧で弁体１４を開弁方向へ変
位させるので、空気圧がシリンダ１の排出液体の
液圧と同圧になる前に、弁体１４が開放されて流
通孔１１，１２が連通し、圧力が放出される。し
たがつて、空気圧はスプリング１９のバネ圧だけ
シリンダ１側の液圧より低く保たれ、液室の液圧
もバネ圧だけ低く保たれる。 If the hydraulic pressure in the liquid chamber 8 becomes higher than the hydraulic pressure of the liquid discharged from the cylinder 1, the cylinder 1 will stop operating, so it is maintained at a slightly lower pressure. That is, the diaphragm 16 uses the air pressure in the right pressure chamber 15R and the spring pressure of the spring 19 to displace the valve body 14 in the valve opening direction, so before the air pressure becomes equal to the liquid pressure of the discharged liquid from the cylinder 1, The valve body 14 is opened, the communication holes 11 and 12 communicate with each other, and pressure is released. Therefore, the air pressure is kept lower than the hydraulic pressure on the cylinder 1 side by the spring pressure of the spring 19, and the hydraulic pressure in the liquid chamber is also kept lower by the spring pressure.
このように、液室８の液圧はシリンダ１と絞り
弁７間の液圧より少し低く設定されるので、シリ
ンダ１から排出される液体の液圧と液室８の液圧
の差が小さくなり、液室８に流入する液体の急激
な膨張が起らず気泡の発生が防止される。 In this way, the fluid pressure in the fluid chamber 8 is set slightly lower than the fluid pressure between the cylinder 1 and the throttle valve 7, so the difference between the fluid pressure of the fluid discharged from the cylinder 1 and the fluid pressure in the fluid chamber 8 is small. Therefore, the liquid flowing into the liquid chamber 8 does not rapidly expand, and the generation of bubbles is prevented.
第３図は第２実施例を示す断面図である。この
実施例においては、ロツド４への負荷が急に無く
なつた場合に、空気室９の圧力を積極的に上昇さ
せるようにしている。即ち、圧力制御弁PV2の圧
力作用室１５Ｌ，１５Ｒは、第２実施例の圧力作
用室１５Ｌ，１５Ｒと同じ構造となつている。弁
室１３は、流通孔１１から流通孔１２へ向つて形
成された弁座２０によつて、２つの弁室１３Ａ，
１３Ｂに区画されている。この弁座２０に、弁体
１４′の移動方向と同方向へ摺動可能な可動弁体
２１が、押圧バネ２２によつて弾圧されている。
可動弁体２１には、流通孔１２と弁体１４′側の
弁室１３Ａとを連通し、かつ弁体１４′によつて
開閉される弁孔２３があけられている。そして、
弁座２０によつて区画された可動弁体２１側の弁
室１３Ｂには、空気圧の供給孔２４があけられて
いる。 FIG. 3 is a sectional view showing the second embodiment. In this embodiment, when the load on the rod 4 suddenly disappears, the pressure in the air chamber 9 is actively increased. That is, the pressure action chambers 15L, 15R of the pressure control valve PV 2 have the same structure as the pressure action chambers 15L, 15R of the second embodiment. The valve chamber 13 is divided into two valve chambers 13A and 13 by a valve seat 20 formed from the flow hole 11 toward the flow hole 12.
It is divided into 13B. A movable valve body 21, which is slidable in the same direction as the movement direction of the valve body 14', is pressed against the valve seat 20 by a pressure spring 22.
The movable valve body 21 is provided with a valve hole 23 that communicates the communication hole 12 with the valve chamber 13A on the valve body 14' side and is opened and closed by the valve body 14'. and,
An air pressure supply hole 24 is bored in the valve chamber 13B on the side of the movable valve body 21, which is partitioned by the valve seat 20.
この実施例によれば、通常は可動弁体２１が弁
座２０に当接した状態で、液圧と空気圧の差によ
り弁孔２３が開閉されて、液室８の液圧をシリン
ダ１と絞り弁７間の液圧より少し低く保つて気泡
の発生を防止する。 According to this embodiment, normally, with the movable valve body 21 in contact with the valve seat 20, the valve hole 23 is opened and closed due to the difference between the hydraulic pressure and the air pressure, and the hydraulic pressure in the liquid chamber 8 is reduced to the cylinder 1. The fluid pressure between valves 7 and 7 is kept slightly lower to prevent bubbles from forming.
ピストンロツド４が負荷を受けて矢印a1方向に
移動中に、負荷が急に無くなると、シリンダ１と
絞り弁７間の液圧は急激に高まり、左側の圧力作
用室１５Ｌに作用して第４図に示すようにダイヤ
フラム１６を矢印a2方向へ変位させる。この変位
は弁棒１８を介して可動弁体２１に伝えられ、押
圧バネ２２を圧縮して、弁座２０から可動弁体２
１を離間させる。したがつて、弁室１３Ａと弁室
１３Ｂが連通され、供給孔２４に供給されていた
空気圧が流通孔１１を通り空気室９に加えられ
る。そのため、液室８の液圧も急速に上昇されて
流入する流体との圧力差が小さくなり、気泡の発
生が防止される。弁室１３Ａの空気圧が絞り弁７
とシリンダ１間の液圧に近づくと、スプリング１
９のバネ圧が加算されているので、ダイヤフラム
１６は矢印a3方向へ戻される。可動弁体２１は、
押圧バネ２２によつて弁座２０に当接され、供給
孔２４からの空気圧の供給を遮断する。その後の
動作は、第１実施例と同様にダイヤフラム１６の
変位によつて弁孔２３を開閉し、スプリング１９
の弾圧力だけ液室の液圧を低く保つように動作す
る。 When the load suddenly disappears while the piston rod 4 is moving in the direction of arrow a1 under load, the hydraulic pressure between the cylinder 1 and the throttle valve 7 increases rapidly, acting on the left pressure chamber 15L and As shown in the figure, the diaphragm 16 is displaced in the direction of arrow a2 . This displacement is transmitted to the movable valve body 21 via the valve stem 18, compresses the pressing spring 22, and moves the movable valve body 21 from the valve seat 20.
1 apart. Therefore, the valve chamber 13A and the valve chamber 13B are communicated with each other, and the air pressure that has been supplied to the supply hole 24 is applied to the air chamber 9 through the communication hole 11. Therefore, the liquid pressure in the liquid chamber 8 is also rapidly increased, reducing the pressure difference between the liquid chamber 8 and the inflowing fluid, thereby preventing the generation of bubbles. The air pressure in the valve chamber 13A is the throttle valve 7.
When the hydraulic pressure between cylinder 1 and cylinder 1 approaches, spring 1
Since the spring pressure of 9 is added, the diaphragm 16 is returned in the direction of arrow a3 . The movable valve body 21 is
It is brought into contact with the valve seat 20 by the pressure spring 22, and the supply of air pressure from the supply hole 24 is cut off. The subsequent operation is to open and close the valve hole 23 by displacement of the diaphragm 16, and to open and close the spring 19 as in the first embodiment.
It operates to keep the fluid pressure in the fluid chamber low by the elastic force of.
以上のように本考案によれば、エアハイドロコ
ンバータ液室の液圧と、シリンダが排出したシリ
ンダと絞り弁間の液圧との差を小さく、かつ液室
側の液圧をシリンダ側より低く設定することがで
きるので、液室に流入する液体の急激な膨張によ
る気泡の発生を防止することができる。その結
果、気泡による液体の非圧縮性が失なわれるのを
防止して、シリンダの制御を確実にすると共に、
見掛けの太積の膨張による溢流等を防止すること
ができる。 As described above, according to the present invention, the difference between the fluid pressure in the air-hydro converter fluid chamber and the fluid pressure between the cylinder and the throttle valve discharged by the cylinder is made small, and the fluid pressure on the fluid chamber side is lower than that on the cylinder side. Since this can be set, it is possible to prevent the generation of bubbles due to rapid expansion of the liquid flowing into the liquid chamber. As a result, the incompressibility of the liquid due to air bubbles is prevented, and the control of the cylinder is ensured.
It is possible to prevent overflow, etc. due to the apparent expansion of thick piles.
第１図は従来のエアハイドロコンバータを備え
た空圧シリンダの断面図、第２図〜第４図は本考
案の実施例を示し、第２図は本考案によるエアハ
イドロコンバータを備えた空圧シリンダの断面
図、第３図は本考案の第２実施例を示す断面図、
第４図は圧力制御弁の断面図である。
図において、１は空圧シリンダ、６はエアハイ
ドロコンバータ、７は絞り弁、８は液室、９は空
気室、１３，１３Ａ，１３Ｂは弁室、１４，１
４′は弁体、１５Ｌ，１５Ｒは圧力作用室、１６
はダイヤフラム、１７は連通孔、１９はスプリン
グ、２０は弁座、２１は可動弁体、PV1，PV2は
圧力制御弁、SVは切換弁、Ａは空気圧源である。
Fig. 1 is a sectional view of a pneumatic cylinder equipped with a conventional air-hydro converter, Figs. 2 to 4 show embodiments of the present invention, and Fig. 2 is a pneumatic cylinder equipped with an air-hydro converter according to the present invention. A sectional view of a cylinder, FIG. 3 is a sectional view showing a second embodiment of the present invention,
FIG. 4 is a sectional view of the pressure control valve. In the figure, 1 is a pneumatic cylinder, 6 is an air-hydro converter, 7 is a throttle valve, 8 is a liquid chamber, 9 is an air chamber, 13, 13A, 13B are valve chambers, 14, 1
4' is a valve body, 15L, 15R are pressure action chambers, 16
17 is a diaphragm, 17 is a communication hole, 19 is a spring, 20 is a valve seat, 21 is a movable valve body, PV 1 and PV 2 are pressure control valves, SV is a switching valve, and A is an air pressure source.
Claims (1)
を介してシリンダ１に接続され、前記液室上部の
空気室９に印加される空気圧によつて前記シリン
ダ１に圧力液体を供給するエアハイドロコンバー
タにおいて、 前記空気室９に圧力制御弁を接続すると共に、 該圧力制御弁の圧力作用室を、弁体と連動する
圧力応動体１６で仕切り、 一方の圧力作用室には、圧力応動体１６を開弁
方向へ変位させるように、前記空気室９を接続し
て空気を導入すると共に、弾性手段１９を設け、 他方の圧力作用室には、圧力応動体１６を閉弁
方向へ変位させるように、前記シリンダ１と絞り
弁７間を接続して、圧力液体を導入することによ
り、 シリンダ排液時に、エアハイドロコンバータ６
の空気室９の空気が、大気に排出されるのを抑制
するように構成されたエアハイドロコンバータ。[Scope of claim for utility model registration] The liquid chamber 8 of the air-hydro converter 6 is the throttle valve 7.
In the air-hydro converter, the air-hydro converter is connected to the cylinder 1 via the air-hydro converter and supplies pressurized liquid to the cylinder 1 by air pressure applied to the air chamber 9 above the liquid chamber, and a pressure control valve is connected to the air chamber 9. At the same time, the pressure action chamber of the pressure control valve is partitioned by a pressure response body 16 that interlocks with the valve body, and one pressure action chamber is provided with the air chamber 9 so as to displace the pressure response body 16 in the valve opening direction. is connected to introduce air, and an elastic means 19 is provided, and the other pressure acting chamber is connected between the cylinder 1 and the throttle valve 7 so as to displace the pressure responsive body 16 in the valve closing direction. , by introducing pressure liquid into the air-hydro converter 6 when draining the cylinder.
An air-hydro converter configured to suppress air in the air chamber 9 from being discharged to the atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2522282U JPS58127201U (en) | 1982-02-23 | 1982-02-23 | air hydro converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2522282U JPS58127201U (en) | 1982-02-23 | 1982-02-23 | air hydro converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58127201U JPS58127201U (en) | 1983-08-29 |
| JPH0133844Y2 true JPH0133844Y2 (en) | 1989-10-16 |
Family
ID=30037200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2522282U Granted JPS58127201U (en) | 1982-02-23 | 1982-02-23 | air hydro converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58127201U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100983028B1 (en) * | 2010-01-15 | 2010-09-17 | 김기찬 | Actuator using pneumatic pressure and oil pressure |
-
1982
- 1982-02-23 JP JP2522282U patent/JPS58127201U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58127201U (en) | 1983-08-29 |
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