JPH0324882Y2 - - Google Patents
Info
- Publication number
- JPH0324882Y2 JPH0324882Y2 JP1984120932U JP12093284U JPH0324882Y2 JP H0324882 Y2 JPH0324882 Y2 JP H0324882Y2 JP 1984120932 U JP1984120932 U JP 1984120932U JP 12093284 U JP12093284 U JP 12093284U JP H0324882 Y2 JPH0324882 Y2 JP H0324882Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- logic valve
- pressure
- logic
- circuit
- 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
- 239000012530 fluid Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Fluid-Pressure Circuits (AREA)
- Control Of Fluid Pressure (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案はロジツク弁を使用して慣性要素の大き
い負荷を衝撃なく減速停止させる減速回路装置に
関する。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a deceleration circuit device that uses a logic valve to decelerate and stop a load with a large inertial element without impact.
（従来の技術）
従来、この種の減速回路装置として第１図示の
ようにロジツク弁ａを油圧アクチユエータｂのタ
ンク戻り回路ｃに介在させ、該ロジツク弁ａの前
方の流体を開閉弁１を設けたパイロツト回路ｄを
介してロジツク弁ａの操作室ｅに導き、その圧力
でロジツク弁ａの弁体ｆを閉弁させるようにした
ものが知られ、この場合パイロツト回路ｄに絞り
弁ｇを設けて該弁体ｆの閉弁速度が遅くなるよう
に制御される。（考案が解決しようとする問題点）
該弁体ｆはシートに深く進入した頭部を有する
クツシヨン付のものが使用され、該弁体ｆが徐々
に閉じると次第に回路ｃの圧力が高まり、アクチ
ユエータｂを衝撃なく減速停止させるのである
が、実際には次の理由で衝撃なく減速停止させる
ことが困難である。(Prior Art) Conventionally, as shown in FIG. 1, this type of reduction circuit device has a logic valve a interposed in a tank return circuit c of a hydraulic actuator b, and a fluid opening/closing valve 1 in front of the logic valve a. There is a known system in which the pressure is guided to the operation chamber e of the logic valve a through a pilot circuit d, and the pressure is used to close the valve body f of the logic valve a.In this case, the pilot circuit d is provided with a throttle valve g. The valve closing speed of the valve body f is controlled to be slow. (Problem to be solved by the invention) The valve body f is equipped with a cushion and has a head that is deeply inserted into the seat. When the valve body f gradually closes, the pressure in the circuit c gradually increases, and the actuator b is to be decelerated to a stop without impact, but in reality it is difficult to decelerate and stop without impact for the following reasons.
即ち、絞り弁ｇによりロジツク弁ａの室ｅに流
入する流量を絞る方法では、ロジツク弁ａの弁体
ｆのストローク即ち弁開度とロジツク弁ａの絞り
特性の関係を利用するため、ロジツク弁ａを通過
する流量とその絞り特性とが充分に合致していな
い場合、とりわけロジツク弁ａの口径が大きく通
過流量が少ない場合には絞り弁ｇを通る流量が少
なくなり、その結果ロジツク弁ａは徐々にタンク
戻り回路ｃの流量を絞ることが出来ず、衝撃なく
アクチユエータｂを減速停止させることが困難に
なる。 That is, in the method of throttling the flow rate flowing into the chamber e of the logic valve a using the throttle valve g, the relationship between the stroke of the valve body f of the logic valve a, that is, the valve opening, and the throttle characteristic of the logic valve a is used. If the flow rate passing through throttle valve a and its throttle characteristics do not match sufficiently, especially if the diameter of logic valve a is large and the flow rate passing through it is small, the flow rate passing through throttle valve g will be small, and as a result, logic valve a will It becomes impossible to gradually reduce the flow rate of the tank return circuit c, and it becomes difficult to decelerate and stop the actuator b without impact.
またアクチユエータｂの高速作動時にはロジツク
弁ａはタンク戻り回路ｃの流れを阻害しないよう
に全開状態にあり、減速作動時の絞り状態のロジ
ツク弁開度よりも大幅に開いているため、全開状
態から絞り状態にまで移動する間も絞り弁ｇが作
用するので迅速にロジツク弁ａは減速行程に入れ
ず無駄時間が多くなる欠点がある。特に、アクチ
ユエータｂの減速度を緩くする程絞り弁ｇを絞
り、ロジツク弁ａを遅く閉弁させる必要があるの
で前記欠点は著しくなる。Furthermore, during high-speed operation of actuator b, logic valve a is fully open so as not to obstruct the flow in tank return circuit c, and the logic valve a is opened much wider than the logic valve opening in the throttled state during deceleration operation. Since the throttle valve g acts even during the movement to the throttle state, the logic valve a cannot enter the deceleration stroke quickly, resulting in a large amount of wasted time. In particular, the slower the deceleration of actuator b, the more it is necessary to throttle valve g and close logic valve a later, so the above-mentioned drawback becomes more significant.
本考案はロジツク弁の絞り特性と通過流量とが合
致しない場合に於てもアクチユエータを衝撃なく
減速・停止させ得ると共にロジツク弁が迅速に減
速状態に作動出来る減速回路装置を提供すること
を目的とするものである。The object of the present invention is to provide a deceleration circuit device that can decelerate and stop an actuator without impact even when the throttle characteristics of the logic valve and the flow rate do not match, and also that can quickly operate the logic valve into a deceleration state. It is something to do.
（問題点を解決するための手段）
本考案では、慣性要素の大きい負荷を駆動する
油圧アクチユエータのタンク戻り回路にロジツク
弁を介在させ、該ロジツク弁の閉弁をその前方の
タンク戻り回路からパイロツト回路を介して導い
た流体により行なう式のものに於て、該パイロツ
ト回路に該ロジツク弁の閉弁圧力を一定に制御す
る減圧弁を設けるようにした。(Means for solving the problem) In the present invention, a logic valve is interposed in the tank return circuit of a hydraulic actuator that drives a load with a large inertial element, and the closing of the logic valve is piloted from the tank return circuit in front of the logic valve. In the type operated by fluid introduced through a circuit, the pilot circuit is provided with a pressure reducing valve for controlling the closing pressure of the logic valve at a constant level.
（作用）
該ロジツク弁はパイロツト回路を介して導かれ
る流体により閉じるが、該パイロツト回路には減
圧弁が設けられており、該減圧弁はその設定圧力
よりもロジツク弁の前方のタンク戻り回路の圧力
が高くなると設定圧力に制御するのでロジツク弁
の閉弁用圧力が一定に保たれ、該ロジツク弁の前
方のタンク戻り回路の圧力即ち減速用圧力をロジ
ツク弁の操作室の面積と減速用圧力が作用する室
の面積で表わされる面積比に従つて一定値に制御
するため、ロジツク弁の絞り特性と通過流量とが
合致しない場合に於ても衝撃なくアクチユエータ
の減速・停止を行なえる。(Function) The logic valve is closed by fluid guided through the pilot circuit, and the pilot circuit is provided with a pressure reducing valve, and the pressure reducing valve has a pressure lower than the set pressure of the tank return circuit in front of the logic valve. When the pressure increases, it is controlled to the set pressure, so the closing pressure of the logic valve is kept constant, and the pressure in the tank return circuit in front of the logic valve, that is, the deceleration pressure, is controlled by the area of the operation chamber of the logic valve and the deceleration pressure. Since the actuator is controlled to a constant value in accordance with the area ratio expressed by the area of the chamber in which it acts, the actuator can be decelerated and stopped without impact even when the throttling characteristics of the logic valve and the passing flow rate do not match.
またロジツク弁の減速用圧力が作用する室に、減
圧弁の設定圧力に見合つた圧力が生じるまでロジ
ツク弁の弁体は瞬時に移動することが出来るので
減速行程に入るまでのロジツク弁の無駄時間を大
幅に短縮出来る。In addition, the valve body of the logic valve can be moved instantaneously until a pressure corresponding to the set pressure of the pressure reducing valve is generated in the chamber where the deceleration pressure of the logic valve acts, so the wasted time of the logic valve before entering the deceleration stroke is reduced. can be significantly shortened.
（実施例）
本考案の実施例を第２図につき説明するに、全
図に於て符号１は慣性要素の大きい負荷を駆動す
る油圧アクチユエータ、２は該油圧アクチユエー
タ１からのタンク戻り回路、３は該回路２に介在
させたロジツク弁を示し、該ロジツク弁３の弁体
３ａの操作室４に、ロジツク弁３の前方のタンク
戻り回路２の流体が開閉弁５を備えたパイロツト
回路６を介して導入されると開弁状態の弁体３ａ
はタンク戻り回路２を絞るように移動する。該タ
ンク戻り回路２が絞られるとアクチユエータ１の
出口側の圧力が上り、その圧力は減速用圧力とし
て慣性負荷を駆動中のアクチユエータ１にブレー
キを加える。(Embodiment) An embodiment of the present invention will be described with reference to FIG. 2. In all the figures, reference numeral 1 indicates a hydraulic actuator that drives a load with a large inertial element, 2 indicates a tank return circuit from the hydraulic actuator 1, and 3 2 shows a logic valve interposed in the circuit 2, and the fluid in the tank return circuit 2 in front of the logic valve 3 flows into the operation chamber 4 of the valve body 3a of the logic valve 3 through a pilot circuit 6 equipped with an on-off valve 5. When introduced through the valve body 3a, the valve body 3a is in an open state.
moves so as to throttle the tank return circuit 2. When the tank return circuit 2 is throttled, the pressure on the outlet side of the actuator 1 increases, and this pressure is used as deceleration pressure to apply a brake to the actuator 1 that is driving an inertial load.
該ロジツク弁３の弁体３ａは室４を開閉弁５を介
してタンク７に接続すると、ロジツク弁３の前方
のタンク戻り回路２の圧力が作用する室８の圧力
で全開し、アクチユエータ１の高速作動を可能に
する。When the valve element 3a of the logic valve 3 is connected to the tank 7 via the opening/closing valve 5 in the chamber 4, it is fully opened by the pressure in the chamber 8 on which the pressure of the tank return circuit 2 in front of the logic valve 3 acts, and the actuator 1 is opened. Enables high-speed operation.
アクチユエータ１を衝撃なく減速・停止させるに
はロジツク弁３の弁体３ａが徐々に作動すればよ
いが、かかる作動は従来のものでは困難であり前
記した不都合がある。そこでパイロツト回路６に
減圧弁９を介在させ、ロジツク弁３の室４に作用
するパイロツト回路６の圧力を一定に保つことに
より減速用圧力をロジツク弁３、室４の面積A3
と室８の面積A1との面積比A3／A1に従つて一定
値にすることが出来る。In order to decelerate and stop the actuator 1 without impact, the valve body 3a of the logic valve 3 should be operated gradually, but such operation is difficult with conventional valves and has the disadvantages mentioned above. Therefore, by interposing a pressure reducing valve 9 in the pilot circuit 6 and keeping the pressure of the pilot circuit 6 that acts on the chamber 4 of the logic valve 3 constant, the pressure for deceleration can be reduced by reducing the area A 3 of the logic valve 3 and the chamber 4.
can be set to a constant value according to the area ratio A 3 /A 1 of the area A 1 of the chamber 8 and the area A 1 of the chamber 8.
減圧弁９で設定した圧力prがロジツク弁３の室４
に加わると、室８に設定圧力がprに見合つた圧力
P1（P1＝A3／Ａ×pr）が生じるまで瞬時に弁体３
ａが移動するので、ロジツク弁３は迅速にアクチ
ユエータ１の減速行程に入ることが出来る。The pressure pr set by the pressure reducing valve 9 is applied to the chamber 4 of the logic valve 3.
When the pressure is applied to chamber 8, the set pressure in chamber 8 becomes the pressure commensurate with pr.
Valve body 3 instantly until P 1 (P 1 = A 3 /A x pr) occurs.
Since a moves, the logic valve 3 can quickly enter the deceleration stroke of the actuator 1.
（考案の効果）
このように本考案によるときは、アクチユエー
タの減速停止制御を行なうロジツク弁の閉弁圧力
を減圧弁を設けて一定に制御したのでロジツク弁
の絞り特性と通過流量とが合致しない場合でもロ
ジツク弁は適切にアクチユエータの減速・停止を
制御し、しかもその作動が迅速である等の効果が
ある。(Effect of the invention) As described above, according to the invention, since the closing pressure of the logic valve that performs deceleration and stop control of the actuator is controlled to be constant by providing a pressure reducing valve, the throttling characteristics of the logic valve and the passing flow rate do not match. Even in such cases, logic valves can appropriately control the deceleration and stopping of the actuator, and have the advantage of being quick to operate.
第１図は従来例の線図、第２図は本考案の実施
例の線図である。
１……油圧アクチユエータ、２……タンク戻り
回路、３……ロジツク弁、６……パイロツト回
路、９……減圧弁。
FIG. 1 is a diagram of a conventional example, and FIG. 2 is a diagram of an embodiment of the present invention. 1... Hydraulic actuator, 2... Tank return circuit, 3... Logic valve, 6... Pilot circuit, 9... Pressure reducing valve.
Claims (1)
エータのタンク戻り回路にロジツク弁を介在さ
せ、該ロジツク弁の閉弁をその前方のタンク戻り
回路からパイロツト回路を介して導いた流体によ
り行なう式のものに於て、該パイロツト回路に該
ロジツク弁の閉弁圧力を一定に制御する減圧弁を
設けて成るロジツク弁を使用した減速回路装置。 A logic valve is interposed in the tank return circuit of a hydraulic actuator that drives a load with a large inertial element, and the logic valve is closed by fluid led from the tank return circuit in front of it via a pilot circuit. A deceleration circuit device using a logic valve, wherein the pilot circuit is provided with a pressure reducing valve that controls the closing pressure of the logic valve to be constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12093284U JPS6136702U (en) | 1984-08-08 | 1984-08-08 | Reduction circuit device using logic valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12093284U JPS6136702U (en) | 1984-08-08 | 1984-08-08 | Reduction circuit device using logic valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6136702U JPS6136702U (en) | 1986-03-07 |
| JPH0324882Y2 true JPH0324882Y2 (en) | 1991-05-30 |
Family
ID=30679730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12093284U Granted JPS6136702U (en) | 1984-08-08 | 1984-08-08 | Reduction circuit device using logic valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6136702U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5663102A (en) * | 1979-10-29 | 1981-05-29 | Kobe Steel Ltd | Turning oil-pressure circuit for oil-pressure shovel, etc. |
| JPS5680505A (en) * | 1979-12-05 | 1981-07-01 | Kobe Steel Ltd | Control circuit for actuator |
-
1984
- 1984-08-08 JP JP12093284U patent/JPS6136702U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5663102A (en) * | 1979-10-29 | 1981-05-29 | Kobe Steel Ltd | Turning oil-pressure circuit for oil-pressure shovel, etc. |
| JPS5680505A (en) * | 1979-12-05 | 1981-07-01 | Kobe Steel Ltd | Control circuit for actuator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6136702U (en) | 1986-03-07 |
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