JP2006300280A - Hydraulic cylinder circuit - Google Patents

Hydraulic cylinder circuit Download PDF

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JP2006300280A
JP2006300280A JP2005126343A JP2005126343A JP2006300280A JP 2006300280 A JP2006300280 A JP 2006300280A JP 2005126343 A JP2005126343 A JP 2005126343A JP 2005126343 A JP2005126343 A JP 2005126343A JP 2006300280 A JP2006300280 A JP 2006300280A
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pressure
valve
tank
contraction
neutral
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Takumi Hikichi
巧 引地
Katsumi Yamagata
克己 山縣
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Kobelco Cranes Co Ltd
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Kobelco Cranes Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent the expansion and contraction of a hydraulic cylinder when a control valve is recovered to a neutral state after its contracting operation while employing a circuit configuration of a neutral block free from a pilot check valve. <P>SOLUTION: First and second expansion cylinders 4, 5 each expanding and contracting a box-type expansion boom are connected in parallel with a hydraulic pump 13 and a tank T through the control valve 19 of the neutral block, and a flow divider 14 and counter balance valves 15, 16 for dividing and collecting flows are mounted at the expansion side of both cylinders 4, 5. A pressure releasing valve 20 switched and operated between a tank position communicated with a tank T and a blocking position is mounted between a contraction-side pressure oil supply pipe conduit 11 and the tank T, and the pressure releasing valve 20 is switched to the tank position for a specific time from a time when the control valve 19 is returned from the cylinder contracting position to the neutral position, thus the contraction-side pressure is released, and the counter balance valves 15, 16 are kept in closed states. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は複数の油圧シリンダを油圧ポンプ及びタンクに対しパラレルに接続して同時に伸縮させる油圧シリンダ回路に関するものである。   The present invention relates to a hydraulic cylinder circuit in which a plurality of hydraulic cylinders are connected in parallel to a hydraulic pump and a tank and simultaneously expanded and contracted.

クレーンや高所作業車等に用いられる箱形伸縮ブームの油圧シリンダ回路を例にとって背景技術を説明する。   The background art will be described by taking a hydraulic cylinder circuit of a box-type telescopic boom used for a crane, an aerial work vehicle or the like as an example.

この種の箱型伸縮ブームにおいては、図２に示すように基本ブーム体(固定ブーム体)１に複数段の可動ブーム体(分かり易く二段の場合で説明する)２,３をテレスコープ状に嵌合させてブーム本体を構成し、第１伸縮シリンダ４によって第２段ブーム体２を、また第２伸縮シリンダ５によって第３段ブーム体３をそれぞれ伸縮させるように構成している。   In this type of box-type telescopic boom, as shown in FIG. 2, a basic boom body (fixed boom body) 1 has a plurality of stages of movable boom bodies (explained in the case of two stages for easy understanding) 2 and 3 in a telescope shape. The boom main body is configured by being fitted to the second boom body 2, and the second stage boom body 2 is expanded and contracted by the first expansion cylinder 4, and the third stage boom body 3 is expanded and contracted by the second expansion cylinder 5.

この場合、特許文献１に示されるように両伸縮シリンダ４,５を同時に同量ずつ伸縮させる油圧シリンダ回路が公知である。   In this case, as shown in Patent Document 1, a hydraulic cylinder circuit that expands and contracts both telescopic cylinders 4 and 5 simultaneously by the same amount is known.

これを図３によって説明する。   This will be described with reference to FIG.

両伸縮シリンダ４,５の伸び側(ヘッド側)油室４ａ,５ａは、伸び側管路６,７を介して伸び側圧油供給管路８に、また縮み側(ロッド側)油室４ｂ,５ｂは縮み側管路９,１０を介して縮み側圧油供給管路１１にそれぞれパラレルに接続され、伸び側及び縮み側両圧油供給管路８,１１がコントロールバルブ１２を介して油圧ポンプ１３及びタンクＴに接続されている。   The expansion side (head side) oil chambers 4a, 5a of the telescopic cylinders 4, 5 are connected to the expansion side pressure oil supply line 8 via the expansion side lines 6, 7, and the contraction side (rod side) oil chambers 4b, 4b. 5b is connected in parallel to the contraction-side pressure oil supply conduit 11 via the contraction-side conduits 9 and 10, and both the expansion-side and contraction-side pressure oil supply conduits 8 and 11 are connected to the hydraulic pump 13 via the control valve 12. And a tank T.

コントロールバルブ１２は、図示しないリモコン弁の操作によって中立位置イから伸長位置ロ、または縮小位置ハに切換わり、このコントロールバルブ１２の切換わり作動によって両伸縮シリンダ４,５が同時に伸縮作動する。   The control valve 12 is switched from the neutral position A to the extended position B or the reduced position C by the operation of a remote control valve (not shown), and both the expansion cylinders 4 and 5 are simultaneously expanded and contracted by the switching operation of the control valve 12.

この場合、シリンダ保持圧は、負荷が大きくなる下段側の第１伸縮シリンダ４で高く、上段側の第２伸縮シリンダ５で低くなるため、ポンプ吐出油が低圧側の第２伸縮シリンダ５側に多く流れて同時伸縮ができなくなる。   In this case, the cylinder holding pressure is high in the lower first extension cylinder 4 where the load increases, and lower in the second extension cylinder 5 on the upper stage, so that the pump discharge oil flows to the second extension cylinder 5 side on the low pressure side. Many flows and can not be expanded and contracted simultaneously.

そこで、この同時伸縮作用を確保するために、伸び側管路６,７にフローデバイダ(分集流弁)１４が設けられている。   Therefore, in order to ensure this simultaneous expansion and contraction action, a flow divider (dividing and collecting valve) 14 is provided in the extension side pipes 6 and 7.

また、ブーム伸長状態で負荷によって両伸縮シリンダ４,５が縮まないように、伸び側管路６,７に安全弁としてのカウンタバランス弁１５,１６が設けられている。   Further, counter balance valves 15 and 16 as safety valves are provided on the extension side pipes 6 and 7 so that the both expansion cylinders 4 and 5 are not contracted by a load in a boom extended state.

この両カウンタバランス弁１５,１６は、縮み側圧力(縮み側管路９,１０の圧力)がパイロット圧として導入され、このパイロット圧が設定値以上となると開く。   The counter balance valves 15 and 16 open when the contraction side pressure (pressure in the contraction side pipes 9 and 10) is introduced as a pilot pressure, and the pilot pressure exceeds a set value.

このような油圧シリンダ回路において、たとえばブーム先端にドリルを取付けて穿孔作業を行う場合に、反力としてブーム先端に図２中矢印Ａで示す突き上げ力が働き、この突き上げ力によって両伸縮シリンダ４,５が勝手に伸びてしまうことがある。   In such a hydraulic cylinder circuit, for example, when a drill is attached to the tip of the boom, a push-up force indicated by an arrow A in FIG. 2 acts on the tip of the boom as a reaction force. 5 may grow without permission.

この両伸縮シリンダ４,５の伸びを防止する手段として、図３に示すようにコントロールバルブ１２について中立リターン、つまり中立位置イで伸び側、縮み側両圧油供給管路８,１１を連通させる構成をとり、その上で、縮み側管路９,１０にパイロットチェック弁１７,１８を設けることにより、コントロールバルブ中立状態で両伸縮シリンダ４,５の縮み側油室４ｂ,５ｂからの油の流出(シリンダ４,５の伸び)を阻止する構成が採用されている。   As a means for preventing the expansion of both the telescopic cylinders 4 and 5, as shown in FIG. 3, the control valve 12 is made to communicate with the neutral return, that is, both the expansion side and contraction side pressure oil supply lines 8 and 11 at the neutral position a. By taking the configuration and providing pilot check valves 17 and 18 on the contraction side conduits 9 and 10, the oil from the contraction side oil chambers 4 b and 5 b of both the expansion cylinders 4 and 5 can be obtained in the neutral state of the control valve. A configuration that prevents outflow (elongation of the cylinders 4 and 5) is employed.

しかし、この構成によると、高価なパイロットチェック弁１７,１８を用いるためコスト高となるという難点があった。   However, according to this configuration, since expensive pilot check valves 17 and 18 are used, there is a problem that the cost is increased.

そこで代替手段として、図４に示すように中立ブロックのコントロールバルブ１９を用いる技術が公知である。   Therefore, as an alternative, a technique using a neutral block control valve 19 as shown in FIG. 4 is known.

この中立ブロック方式では、中立状態で両シリンダポートがブロックされるため、基本的に両伸縮シリンダ４,５の伸びを防止することができる。しかも、中立リターン方式のパイロットチェック弁１７,１８が不要となるためコストが安くつく。
実開平７−２８１８４号公報 In this neutral block system, since both cylinder ports are blocked in the neutral state, it is basically possible to prevent both the telescopic cylinders 4 and 5 from extending. In addition, since the neutral return type pilot check valves 17 and 18 are not required, the cost is low.
Japanese Utility Model Publication No. 7-28184

ところが、この中立ブロックの回路構成をとると、次のような弊害が生じる。   However, taking this neutral block circuit configuration causes the following adverse effects.

すなわち、シリンダ縮小操作後にコントロールバルブ１９を中立復帰させた状態で、縮み側(油室４ｂ,５ｂ、管路９,１０及び圧油供給管路１１)に高圧が閉じ込められる場合がある。   That is, there is a case where high pressure is confined in the contraction side (the oil chambers 4b and 5b, the conduits 9 and 10 and the pressure oil supply conduit 11) in a state where the control valve 19 is returned to the neutral state after the cylinder contraction operation.

この場合、カウンタバランス弁１５,１６が上記縮み側圧力をパイロット圧として受けて開いてしまい、両伸縮シリンダ４,５の伸び側油室４ａ,５ａ同士がカウンタバランス弁１５,１６及びフローデバイダ１４を介してつながった状態となる。   In this case, the counter balance valves 15 and 16 are opened by receiving the contraction side pressure as a pilot pressure, and the expansion side oil chambers 4a and 5a of the both expansion cylinders 4 and 5 are connected to each other. It will be in the state connected through.

こうなると、両伸縮シリンダ４,５の保持圧に差があることから、伸び側の油が高圧側の第１伸縮シリンダ４から低圧側の第２伸縮シリンダ５に移動する。また、これに伴い縮み側油室４ｂ,５ｂ間でも油の移動が起こるため、第２伸縮シリンダ５(第３段ブーム体３)が伸びて第１伸縮シリンダ４(第２段ブーム体２)が縮む現象が発生してしまう。   In this case, since there is a difference in the holding pressure between the two expansion cylinders 4 and 5, the oil on the extension side moves from the first expansion cylinder 4 on the high pressure side to the second expansion cylinder 5 on the low pressure side. As a result, oil also moves between the contraction-side oil chambers 4b, 5b, so that the second telescopic cylinder 5 (third stage boom body 3) extends and the first telescopic cylinder 4 (second stage boom body 2) extends. Will occur.

従って、元々、伸び防止のために中立ブロックの回路構成をとったことの意義が失われてしまう。また、ブーム全長は一定でも細くて強度が低い第３段ブーム体３が長く伸びることでクレーン能力の点で不利となる。   Therefore, the significance of originally taking the circuit configuration of the neutral block to prevent elongation is lost. Moreover, even if the boom total length is constant, the third stage boom body 3 which is thin and low in strength is elongated, which is disadvantageous in terms of crane capacity.

そこで、本発明は、パイロットチェック弁を用いない中立ブロックの回路構成をとりながら、コントロールバルブを縮小操作後に中立復帰させたときの油圧シリンダの伸び縮みを確実に防止することができる油圧シリンダ回路を提供するものである。   Therefore, the present invention provides a hydraulic cylinder circuit that can reliably prevent expansion and contraction of the hydraulic cylinder when the control valve is returned to neutral after the reduction operation while taking a circuit configuration of a neutral block that does not use a pilot check valve. It is to provide.

請求項１の発明は、複数の油圧シリンダと、中立状態でシリンダポートをブロックするコントロールバルブとを備え、上記各油圧シリンダを上記コントロールバルブを介して油圧ポンプ及びタンクに対しパラレルに接続することにより同時に伸縮作動させ、かつ、シリンダ縮み側圧力をパイロット圧として作動するカウンタバランス弁により、上記コントロールバルブ中立状態でのシリンダ縮小作動を防止するように構成された油圧シリンダ回路において、上記各油圧シリンダの縮み側管路をタンクに連通させて同管路内の圧力を抜くタンク位置とこの連通を遮断する遮断位置との間で切換わり作動する圧抜き弁と、この圧抜き弁の切換わり作動を制御する制御手段と、上記コントロールバルブがシリンダ縮小位置から中立位置に復帰したことを検出して上記コントローラに送る検出手段とが設けられ、上記制御手段は、上記コントロールバルブの縮小位置からの中立復帰後、上記圧抜き弁をタンク位置に切換えて、シリンダ縮み側の圧力を、上記カウンタバランス弁の閉じ状態を保持する圧力まで低下させるように構成されたものである。   The invention of claim 1 includes a plurality of hydraulic cylinders and a control valve that blocks the cylinder port in a neutral state, and the hydraulic cylinders are connected in parallel to the hydraulic pump and the tank via the control valves. In the hydraulic cylinder circuit configured to prevent the cylinder contraction operation in the neutral state of the control valve by the counter balance valve that is simultaneously expanded and contracted and operates using the cylinder contraction side pressure as a pilot pressure, A pressure relief valve that switches between a tank position where the compression side pipe line is connected to the tank to release the pressure in the pipe line and a shut-off position that cuts off this communication, and the pressure release valve switching action. Check that the control means to control and the control valve have returned from the cylinder contraction position to the neutral position. Detecting means for detecting and sending to the controller, the control means switches the pressure release valve to the tank position after the neutral return from the contracted position of the control valve, the pressure on the cylinder contraction side, The counter balance valve is configured to be lowered to a pressure that maintains the closed state.

請求項２の発明は、請求項１の構成において、複数の油圧シリンダが、箱形伸縮ブームを構成する上下複数段の可動ブーム体を同時に伸縮させる伸縮駆動手段として用いられるとともに、コントロールバルブと各油圧シリンダの伸び側管路との間に分集流用のフローデバイダが設けられたものである。   A second aspect of the present invention is the structure of the first aspect, wherein the plurality of hydraulic cylinders are used as telescopic drive means for simultaneously expanding and contracting the upper and lower movable boom bodies constituting the box-type telescopic boom, A flow divider for dividing flow is provided between the extension side pipe line of the hydraulic cylinder.

請求項３の発明は、請求項１または２の構成において、制御手段は、コントロールバルブの縮小位置からの中立復帰時点から、縮み側管路の圧力が、カウンタバランス弁の閉じ状態を保持する圧力に低下するまでの時間として予め設定された時間だけ圧抜き弁をタンク位置に切換えるように構成されたものである。   According to a third aspect of the present invention, in the configuration of the first or second aspect, the control means is a pressure at which the pressure of the contraction side pipe line maintains the closed state of the counter balance valve from the neutral return time from the contracted position of the control valve. The pressure relief valve is configured to be switched to the tank position for a time set in advance as the time until the pressure decreases.

請求項４の発明は、請求項１乃至３のいずれかの構成において、圧抜き弁として、制御手段からの電気信号によって切換わる電磁式の切換弁が用いられたものである。   According to a fourth aspect of the present invention, in the configuration of any one of the first to third aspects, an electromagnetic switching valve that is switched by an electric signal from the control means is used as the pressure relief valve.

本発明によると、コントロールバルブの縮小位置からの中立復帰後、縮み側圧力を圧抜き弁によってタンクに抜き、カウンタバランス弁の閉じ状態を保持するように構成したから、中立状態での油圧シリンダ間の油の流通を阻止することができる。   According to the present invention, after the neutralization return from the contracted position of the control valve, the pressure on the contraction side is extracted into the tank by the pressure release valve, and the closed state of the counter balance valve is maintained. The oil distribution can be prevented.

すなわち、中立ブロックの回路構成をとりながら、その弊害である、中立復帰時に油圧シリンダが伸び縮みする現象の発生を確実に防止することができる。   That is, while taking the circuit configuration of the neutral block, it is possible to surely prevent the occurrence of the phenomenon that the hydraulic cylinder expands and contracts when neutral is restored.

この場合、請求項２の発明によると、箱形伸縮ブームの油圧シリンダ回路において、下段側シリンダが縮んで上段側シリンダが伸びる現象の発生を防止して本来のクレーン能力を確保することができる。   In this case, according to the invention of claim 2, in the hydraulic cylinder circuit of the box-type telescopic boom, it is possible to prevent the phenomenon that the lower cylinder is contracted and the upper cylinder is extended, and the original crane capacity can be secured.

また、請求項３の発明によると、予め設定された時間(縮み側圧力がカウンタバランス弁を閉じ状態に保持する圧力に低下するまでの時間)だけ圧抜き弁による圧抜き作用を行わせるように構成したから、縮み側圧力を圧力センサで検出して圧抜き弁を切換える構成をとった場合と比較して、圧力センサが不要となる分、コスト的に有利となる。   Further, according to the invention of claim 3, the pressure release operation by the pressure release valve is performed for a preset time (time until the contraction side pressure is reduced to a pressure for holding the counter balance valve in the closed state). Since it is configured, the pressure sensor is unnecessary, compared with a case where the pressure sensor is used to detect the contraction side pressure and the pressure relief valve is switched, which is advantageous in terms of cost.

一方、請求項４の発明によると、圧抜き弁として電磁式の切換弁を用いたから、油圧パイロット式の切換弁を用いた場合と比較して回路構成が簡単となり、圧抜き弁の切換えの応答性も良いものとなる。   On the other hand, according to the invention of claim 4, since the electromagnetic switching valve is used as the pressure release valve, the circuit configuration becomes simpler than the case where the hydraulic pilot type switching valve is used, and the response of switching the pressure release valve. Good quality.

本発明の実施形態を図１によって説明する。   An embodiment of the present invention will be described with reference to FIG.

実施形態にかかる油圧シリンダ回路は、図４に示す従来の油圧シリンダ回路と同様に、箱型伸縮ブームを伸縮作動させるための第１及び第２両伸縮シリンダ４,５を備え、かつ、コントロールバルブ１９について中立ブロック、つまり中立位置イで両シリンダポートをブロックして油の流通を阻止する構成をとっている。   Similar to the conventional hydraulic cylinder circuit shown in FIG. 4, the hydraulic cylinder circuit according to the embodiment includes first and second telescopic cylinders 4 and 5 for extending and retracting the box-type telescopic boom, and a control valve. No. 19 has a neutral block, that is, a configuration in which both cylinder ports are blocked at the neutral position a to prevent oil from flowing.

以下の実施形態において、図４に示す従来回路と同一部分には同一符号を付して示し、その重複説明を省略する。   In the following embodiment, the same parts as those in the conventional circuit shown in FIG.

この油圧シリンダ回路においては、縮み側圧油供給管路１１とタンクＴとの間に電磁切換式の圧抜き弁２０が設けられている。   In this hydraulic cylinder circuit, an electromagnetic switching type pressure relief valve 20 is provided between the compression side pressure oil supply pipe 11 and the tank T.

この圧抜き弁２０は、制御手段としてのコントローラ２１からの切換指令信号が入力されたときに、図示の遮断位置イからタンクＴに連通するタンク位置ロに切換わる。   The pressure release valve 20 is switched from the illustrated shut-off position A to the tank position B communicating with the tank T when a switching command signal is input from the controller 21 as control means.

一方、コントロールバルブ１９を制御するリモコン弁２２の縮小側パイロット圧を検出する圧力センサ２３が設けられ、この圧力センサ２３により、リモコン弁２２、すなわちコントロールバルブ１９がシリンダ縮み側に操作されたこと、及びこの縮み側から中立側に操作されたことが検出されてコントローラ２１に送られる。   On the other hand, a pressure sensor 23 for detecting the reduced pilot pressure of the remote control valve 22 for controlling the control valve 19 is provided, and by this pressure sensor 23, the remote control valve 22, that is, the control valve 19 is operated to the cylinder contraction side, And it is detected that it has been operated from the contraction side to the neutral side and sent to the controller 21.

コントローラ２１はタイマ２４を備え、このタイマ２４の計時作用により、上記のようにコントロールバルブ１９が一旦縮小操作された後に中立復帰した時点から予め設定した時間だけコントローラ２１から圧抜き弁２０に切換指令信号が送られる。   The controller 21 is provided with a timer 24. Due to the timing action of the timer 24, the controller 21 switches the pressure relief valve 20 from the controller 21 for a preset time from the time when the control valve 19 is once reduced and then returned to neutral. A signal is sent.

これにより、圧抜き弁２０が設定時間だけタンク位置ロに切換わり、両伸縮シリンダ４,５の縮み側圧力がタンクＴに抜かれる。   As a result, the pressure release valve 20 is switched to the tank position B for the set time, and the pressure on the contraction side of both the expansion cylinders 4 and 5 is released to the tank T.

ここで、上記設定時間は、縮み側圧力がカウンタバランス弁１５,１６の閉じ圧力まで低下するのに必要かつ十分な時間として、適用対象である機械の作業条件等に応じて定められる。   Here, the set time is determined as a necessary and sufficient time for the contraction side pressure to decrease to the closing pressure of the counter balance valves 15 and 16 according to the working condition of the machine to be applied.

従って、中立復帰時点で縮み側に高圧が閉じ込められた場合でも、この圧力が直ちに低下してカウンタバランス弁１５,１６が閉じ状態に保持されるため、中立状態での両伸縮シリンダ４,５間の油の流通を阻止することができる。   Therefore, even when a high pressure is trapped on the contraction side at the time of return to neutral, the pressure immediately decreases and the counter balance valves 15 and 16 are held in the closed state. The oil distribution can be prevented.

すなわち、中立ブロックの回路構成をとりながら、その弊害である、中立復帰時に伸縮シリンダ４,５が伸び縮みする現象の発生を確実に防止することができる。   That is, while taking the circuit configuration of the neutral block, it is possible to reliably prevent the occurrence of the phenomenon that the expansion and contraction cylinders 4 and 5 expand and contract when returning to neutral.

このため、図２に示す箱型伸縮ブームにおいて、下段側の第２段ブーム体２が縮んで上段側の第３段ブーム体３が伸びるという、ブーム強度的に好ましくない現象の発生を防止して本来のクレーン能力を確保することができる。   Therefore, in the box-type telescopic boom shown in FIG. 2, it is possible to prevent a phenomenon in which the second-stage boom body 2 on the lower stage side is contracted and the third-stage boom body 3 on the upper stage side is extended, which is undesirable in terms of boom strength. The original crane capacity can be secured.

他の実施形態
(１) 上記実施形態では、圧抜き弁２０による圧抜き作用を縮小操作後の中立復帰時点から設定時間だけ行わせる構成をとったが、縮み側圧力(たとえば縮み側圧油供給管路１１の圧力)を圧力センサで検出し、中立復帰後、この縮み側圧力に応じて圧抜き弁２０を切換える構成としてもよい。 Other embodiments
(1) In the above embodiment, the pressure release action by the pressure release valve 20 is configured to be performed for a set time from the neutral return time after the reduction operation. However, the pressure on the contraction side (for example, the pressure on the contraction side pressure oil supply line 11) ) May be detected by a pressure sensor, and after the return to neutrality, the pressure relief valve 20 may be switched in accordance with the contraction side pressure.

(２) 圧抜き弁２０として、上記実施形態で挙げた電磁切換弁に代えて油圧パイロット式の切換弁を用い、コントローラ２１からの信号により、パイロット圧源からのパイロット圧を圧抜き弁２０に供給して切換える構成をとってもよい。   (2) As the pressure release valve 20, a hydraulic pilot type switching valve is used instead of the electromagnetic switching valve mentioned in the above embodiment, and the pilot pressure from the pilot pressure source is supplied to the pressure release valve 20 by a signal from the controller 21. It may be configured to supply and switch.

(３) 本発明は、複数段の可動ブーム体を同時に同量ずつ伸縮させる箱型伸縮ブーム用のシリンダ回路にとくに適するが、広く、複数の油圧シリンダをポンプ及びタンクに対してパラレルに接続し、一つのコントロールバルブの操作で各シリンダを伸縮作動させるシリンダ回路に適用することができる。   (3) The present invention is particularly suitable for a cylinder circuit for a box-type telescopic boom that simultaneously expands and contracts a plurality of stages of movable boom bodies by the same amount, but widely, a plurality of hydraulic cylinders are connected in parallel to a pump and a tank. It can be applied to a cylinder circuit in which each cylinder is extended and contracted by operating one control valve.

本発明の実施形態にかかる油圧シリンダ回路の構成を示す図である。It is a figure which shows the structure of the hydraulic cylinder circuit concerning embodiment of this invention. 本発明が適用される箱型伸縮ブームの概略構成を示す図である。It is a figure which shows schematic structure of the box-type telescopic boom to which this invention is applied. 中立リターン方式のコントロールバルブを用いる従来の油圧シリンダ回路の構成を示す図である。It is a figure which shows the structure of the conventional hydraulic cylinder circuit which uses the control valve of a neutral return system. 中立ブロック方式のコントロールバルブを用いる従来の油圧シリンダ回路の構成を示す図である。It is a figure which shows the structure of the conventional hydraulic cylinder circuit which uses the control valve of a neutral block system.

符号の説明Explanation of symbols

２ 箱型伸縮ブームを構成する第２段(下段側)ブーム体
３ 同第３段(上段側)ブーム体
４ 第１伸縮シリンダ
５ 第２伸縮シリンダ
４ａ,５ａ 伸び側油室
４ｂ,５ｂ 縮み側油室
６,７ 伸び側管路
８ 伸び側圧油供給管路
９,１０ 縮み側管路
１１ 縮み側圧油供給管路
１３ 油圧ポンプ
Ｔ タンク
１４ フローデバイダ(分集流弁)
１５,１６ カウンタバランス弁
１９ コントロールバルブ
２０ 圧抜き弁
２１ 制御手段としてのコントローラ
２２ リモコン弁
２３ 検出手段としての圧力センサ
２４ タイマ 2 Second stage (lower stage) boom body constituting the box-type telescopic boom 3 Third stage (upper stage side) boom body 4 First telescopic cylinder 5 Second telescopic cylinder 4a, 5a Stretch side oil chamber 4b, 5b Shrink side Oil chamber 6, 7 Stretch side pipe 8 Stretch side pressure oil supply pipe 9,10 Shrink side pipe 11 Shrink side pressure oil supply pipe 13 Hydraulic pump T tank 14 Flow divider (distribution flow valve)
DESCRIPTION OF SYMBOLS 15,16 Counter balance valve 19 Control valve 20 Pressure relief valve 21 Controller as control means 22 Remote control valve 23 Pressure sensor as detection means 24 Timer

Claims (4)

複数の油圧シリンダと、中立状態でシリンダポートをブロックするコントロールバルブとを備え、上記各油圧シリンダを上記コントロールバルブを介して油圧ポンプ及びタンクに対しパラレルに接続することにより同時に伸縮作動させ、かつ、シリンダ縮み側圧力をパイロット圧として作動するカウンタバランス弁により、上記コントロールバルブ中立状態でのシリンダ縮小作動を防止するように構成された油圧シリンダ回路において、上記各油圧シリンダの縮み側管路をタンクに連通させて同管路内の圧力を抜くタンク位置とこの連通を遮断する遮断位置との間で切換わり作動する圧抜き弁と、この圧抜き弁の切換わり作動を制御する制御手段と、上記コントロールバルブがシリンダ縮小位置から中立位置に復帰したことを検出して上記コントローラに送る検出手段とが設けられ、上記制御手段は、上記コントロールバルブの縮小位置からの中立復帰後、上記圧抜き弁をタンク位置に切換えて、シリンダ縮み側の圧力を、上記カウンタバランス弁の閉じ状態を保持する圧力まで低下させるように構成されたことを特徴とする油圧シリンダ回路。   A plurality of hydraulic cylinders and a control valve that blocks the cylinder port in a neutral state, and the hydraulic cylinders are connected to the hydraulic pump and the tank via the control valves in parallel to be simultaneously expanded and contracted; and In the hydraulic cylinder circuit configured to prevent the cylinder contraction operation in the control valve neutral state by the counter balance valve that operates using the cylinder contraction side pressure as a pilot pressure, the contraction side pipes of the respective hydraulic cylinders are connected to the tank. A pressure relief valve that switches between a tank position for communicating and releasing the pressure in the pipe line and a shut-off position that shuts off this communication; a control means for controlling the switching action of the pressure relief valve; When the control valve returns from the cylinder contraction position to the neutral position, Detecting means for sending to the trawler, and the control means switches the pressure release valve to the tank position after the neutral return from the contracted position of the control valve to change the pressure on the cylinder contraction side of the counter balance valve. A hydraulic cylinder circuit configured to decrease to a pressure that maintains a closed state. 複数の油圧シリンダが、箱形伸縮ブームを構成する上下複数段の可動ブーム体を同時に伸縮させる伸縮駆動手段として用いられるとともに、コントロールバルブと各油圧シリンダの伸び側管路との間に分集流用のフローデバイダが設けられたことを特徴とする請求項１記載の油圧シリンダ回路。   A plurality of hydraulic cylinders are used as expansion / contraction drive means for simultaneously expanding / contracting the movable boom bodies of the upper and lower stages constituting the box-type telescopic boom. 2. The hydraulic cylinder circuit according to claim 1, further comprising a flow divider. 制御手段は、コントロールバルブの縮小位置からの中立復帰時点から、縮み側管路の圧力が、カウンタバランス弁の閉じ状態を保持する圧力に低下するまでの時間として予め設定された時間だけ圧抜き弁をタンク位置に切換えるように構成されたことを特徴とする請求項１または２記載の油圧シリンダ回路。   The control means is a pressure release valve for a preset time as a time from when the control valve is reduced to the neutral position from the contracted position until the pressure in the contraction side pipe decreases to a pressure that maintains the closed state of the counter balance valve. 3. The hydraulic cylinder circuit according to claim 1, wherein the hydraulic cylinder circuit is configured to switch to a tank position. 圧抜き弁として、制御手段からの電気信号によって切換わる電磁式の切換弁が用いられたことを特徴とする請求項１乃至３のいずれか１項に記載の油圧シリンダ回路。   The hydraulic cylinder circuit according to any one of claims 1 to 3, wherein an electromagnetic switching valve that is switched by an electric signal from a control means is used as the pressure release valve.
JP2005126343A 2005-04-25 2005-04-25 Hydraulic cylinder circuit Pending JP2006300280A (en)

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JP2011207598A (en) * 2010-03-30 2011-10-20 Tadano Ltd Boom and crane
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JP2013096462A (en) * 2011-10-31 2013-05-20 Maeda Seisakusho Co Ltd Hydraulic driving circuit for actuator synchronous operation and flow dividing valve
JP2013179847A (en) * 2012-02-29 2013-09-12 Fuji Trailer Manufacturing Co Ltd Levee shaping machine
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WO2014193649A1 (en) * 2013-05-31 2014-12-04 Eaton Corporation Hydraulic system and method for reducing boom bounce with counter-balance protection
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CN104671129A (en) * 2013-11-26 2015-06-03 株式会社多田野 Boom extending and retracting apparatus of a crane
KR200479690Y1 (en) 2014-05-08 2016-02-25 대우조선해양 주식회사 Crane for interal inspection and repairing of ship
CN105967076A (en) * 2016-07-21 2016-09-28 三汽车起重机械有限公司 Double-cylinder freely-telescopic hydraulic control system and crane comprising same
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US10316929B2 (en) 2013-11-14 2019-06-11 Eaton Intelligent Power Limited Control strategy for reducing boom oscillation
US10323663B2 (en) 2014-07-15 2019-06-18 Eaton Intelligent Power Limited Methods and apparatus to enable boom bounce reduction and prevent un-commanded motion in hydraulic systems
CN111894921A (en) * 2020-07-30 2020-11-06 湖南双达机电有限责任公司 Hydraulic system of telescopic boom, telescopic boom and engineering vehicle
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JP2013096462A (en) * 2011-10-31 2013-05-20 Maeda Seisakusho Co Ltd Hydraulic driving circuit for actuator synchronous operation and flow dividing valve
JP2013179847A (en) * 2012-02-29 2013-09-12 Fuji Trailer Manufacturing Co Ltd Levee shaping machine
CN102705284A (en) * 2012-06-21 2012-10-03 三一重工股份有限公司 Synchronous hydraulic control system and shield tunnel borer
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US11566642B2 (en) 2013-11-14 2023-01-31 Danfoss Power Solutions Ii Technology A/S Pilot control mechanism for boom bounce reduction
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