JPH05163745A - Position energy collecting device for ascending or descending working machine - Google Patents
Position energy collecting device for ascending or descending working machineInfo
- Publication number
- JPH05163745A JPH05163745A JP35134991A JP35134991A JPH05163745A JP H05163745 A JPH05163745 A JP H05163745A JP 35134991 A JP35134991 A JP 35134991A JP 35134991 A JP35134991 A JP 35134991A JP H05163745 A JPH05163745 A JP H05163745A
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- boom
- valve
- bottom side
- assist
- 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.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2296—Systems with a variable displacement pump
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ローダ型のバックホー
等の建設機械、フォークリフト等の荷役機械等のように
作業機を昇降することにより仕事をする昇降作業機で、
特に昇降状態の作業機の位置エネルギを回収するための
昇降作業機の位置エネルギー回収装置に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating work machine for carrying out work by elevating a work machine such as a construction machine such as a loader type backhoe and a cargo handling machine such as a forklift.
In particular, the present invention relates to a potential energy recovery device for a lifting / lowering work machine for recovering potential energy of the lifting / lowering work machine.
【０００２】[0002]
【従来の技術】従来の昇降作業機、例えばバックホーに
おける作業機の位置エネルギ回収装置は、図９に示すよ
うに、２本のブームシリンダａ，ｂのほかに、アシスト
シリンダｃをブームシリンダａ，ｂと並設し、このアシ
ストシリンダｂのボトム側を蓄圧器ｄに接続し、アシス
トシリンダｃに蓄積された作業機の位置エネルギを蓄圧
器ｄに圧力として蓄圧してこれを回収するようにしてい
た。2. Description of the Related Art As shown in FIG. 9, a conventional energy recovery device for a lifting work machine, for example, a work machine in a backhoe, includes an assist cylinder c, a boom cylinder a, and a boom cylinder a, in addition to two boom cylinders a, b. b is arranged in parallel, the bottom side of the assist cylinder b is connected to the pressure accumulator d, and the potential energy of the working machine accumulated in the assist cylinder c is accumulated in the pressure accumulator d as pressure to be recovered. It was
【０００３】[0003]
【発明が解決しようとする課題】上記従来の作業機の位
置エネルギ回収装置にあっては、作業機を昇降するため
の、例えば２本のブームシリンダａ，ｂのほかに位置エ
ネルギの回収専用にアシストシリンダｃを設けなければ
ならないため、ブーム及び旋回フレームが標準仕様車と
は異なり、構造が複雑になると共に、シリンダを１本別
に必要となるためコスト高となっていた。In the above-mentioned conventional potential energy recovery apparatus for a working machine, in addition to, for example, two boom cylinders a and b for raising and lowering the working machine, it is dedicated to the recovery of the potential energy. Since the assist cylinder c has to be provided, the boom and the swing frame are different from those of the standard specification vehicle in that the structure is complicated, and a separate cylinder is required, resulting in high cost.
【０００４】本発明は上記のことに鑑みなされたもの
で、通常のブームシリンダ等の１本の昇降シリンダにて
作業機の位置エネルギが回収でき、従来用いられていた
位置エネルギ回収専用のシリンダが不要となり、構造が
簡単で、かつコストダウンを図ることができるように
し、、また上記位置エネルギの回収によるアシスト動作
を所定の条件下で解除して作業機の下降時に、この作業
機の位置エネルギをそのまま利用できるようにし、さら
に必要に応じて全ての昇降シリンダにて作業機の下降動
作を行なうことができる昇降作業機の位置エネルギ回収
装置を提供することを目的とするものである。The present invention has been made in view of the above, and the potential energy of the working machine can be recovered by one elevating cylinder such as an ordinary boom cylinder. It is unnecessary, the structure is simple, and the cost can be reduced. Moreover, the assisting operation by the recovery of the potential energy is canceled under a predetermined condition to lower the potential energy of the working machine when the working machine descends. It is an object of the present invention to provide a potential energy recovery device for a hoisting work machine, which allows the work machine to be used as it is, and can lower the work machine with all the hoisting cylinders as necessary.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、第１の本発明に係る作業機の位置エネルギ回収装置
は、作業機を昇降する複数本の昇降シリンダのうちの少
なくとも１本の昇降シリンダのボトム側とロッド側を昇
降操作弁を介して油圧ポンプに接続し、上記昇降シリン
ダの少なくとも他の１本の昇降シリンダをアシストシリ
ンダとし、このアシストシリンダのボトム側をチェック
弁を介して昇降操作弁に接続し、またパイロットチェッ
ク弁を介して蓄圧器に接続すると共に、リリーフ弁を介
してタンク側に接続し、ロッド側をタンクに接続した構
成となっている。また第２の発明に係る作業機の位置エ
ネルギ回収装置は、上記第１の発明の作業機の位置エネ
ルギ回収装置において、アシストシリンダのボトム側と
パイロットチェック弁との間に、ボトム側をパイロット
チェック弁側へ連通する連通位置とドレンするドレン位
置とを有するアシスト解除弁を介装した構成となってい
る。 さらに第３の発明に係る作業機の位置エネルギー
回収装置は、上記第２の発明の作業機の位置エネルギ回
収装置において、アシスト解除弁に、このアシスト解除
弁がドレン位置のときに、ポンプからの圧油をアシスト
シリンダのロッド側へ供給するポートを有する構成とな
っている。In order to achieve the above object, a potential energy recovery system for a working machine according to a first aspect of the present invention comprises at least one of a plurality of lifting cylinders for lifting the working machine. The bottom side and rod side of the lift cylinder are connected to a hydraulic pump via a lift operation valve, and at least one other lift cylinder of the lift cylinder is used as an assist cylinder, and the bottom side of this assist cylinder is checked via a check valve. It is connected to the lifting operation valve, connected to a pressure accumulator via a pilot check valve, connected to the tank side via a relief valve, and connected the rod side to the tank. A potential energy recovery apparatus for a working machine according to a second aspect of the present invention is the potential energy recovery apparatus for a working apparatus according to the first aspect of the invention, in which a pilot check is performed on the bottom side between the bottom side of the assist cylinder and the pilot check valve. The assist release valve having a communication position communicating with the valve side and a drain position for draining is interposed. Further, a potential energy recovery device for a working machine according to a third aspect of the present invention is the potential energy recovery device for a working machine according to the second aspect of the present invention, wherein the assist release valve is provided with a pump from the pump when the assist release valve is at the drain position. It is configured to have a port for supplying pressure oil to the rod side of the assist cylinder.
【０００６】[0006]
【作 用】上記第１の発明にあっては、昇降操作弁を
上昇側に切換えることにより、各昇降シリンダのボトム
側に圧油が供給されて、作業機は全ての各昇降シリンダ
にて上昇動される。そして昇降操作弁を下降側に切換え
ることにより、ロッド側が昇降操作弁に接続した昇降シ
リンダが昇降操作弁より供給される圧力油にて短縮動さ
れて作業機が下降動作される。そしてこのときのアシス
トシリンダは作業機の下降動作によって短縮動され、こ
のときのボトム側の圧油が蓄圧器に貯えられ、この蓄圧
器に貯えられた圧油は次の上昇作動時に利用される。第
２の発明にあっては、上記作業機の下降動作時におい
て、アシスト解除弁がドレン位置に切換わることによ
り、アシストシリンダのボトム側がタンク側に接続され
て作業機下降の際の位置エネルギの貯え動作がなくな
り、作業機は抵抗なく下降される。さらに第３の発明に
あっては、アシスト解除弁がドレン位置に切換ったとき
に、アシストシリンダのロッド側が昇降操作弁側に接続
され、このアシストシリンダが他の通常の昇降シリンダ
と同じ機能になる。[Operation] In the first aspect of the invention, by switching the raising / lowering operation valve to the raising side, pressure oil is supplied to the bottom side of each raising / lowering cylinder, and the working machine is raised in all the raising / lowering cylinders. Be moved. Then, by switching the raising / lowering operation valve to the lowering side, the raising / lowering cylinder whose rod side is connected to the raising / lowering operation valve is shortened by the pressure oil supplied from the raising / lowering operation valve, and the working machine is lowered. Then, the assist cylinder at this time is shortened by the lowering operation of the work machine, the pressure oil on the bottom side at this time is stored in the pressure accumulator, and the pressure oil stored in this pressure accumulator is used in the next ascending operation. .. In the second aspect of the invention, the assist release valve is switched to the drain position during the lowering operation of the working machine, so that the bottom side of the assist cylinder is connected to the tank side and the potential energy when the working machine lowers. The storage operation disappears and the work implement is lowered without resistance. Further, in the third invention, when the assist release valve is switched to the drain position, the rod side of the assist cylinder is connected to the lifting operation valve side, and this assist cylinder has the same function as other normal lifting cylinders. Become.
【０００７】[0007]
【実 施 例】第１の発明の実施例を図面に基づいて説
明する。この実施例はバックホーの場合であり、図中１
は旋回フレーム、２はこの旋回フレーム１に起伏自在に
枢与されたブーム、３はこのブーム２の先端に連結され
たアーム、４はバケットである。また５ａ，５ｂは上記
ブーフ２を起伏する第１・第２のブームシリンダで、こ
れの基端部は旋回フレーム１に、ピストンロッドの先端
はブーム２にそれぞれ連結されている。６はアームシリ
ンダ、７はバケットシリンダである。上記２本のブーム
シリンダ、すなわち、第１・第２のブームシリンダ５
ａ，５ｂのうち、第１のブームシリンダ５ａのボトム側
とロッド側はブーム操作弁８を介して油圧ポンプ９に接
続してあり、また第２のブームシリンダ５ｂのボトム側
はチェック弁１０を介して上記第１のブームシリンダ５
ａのボトム側に接続してあり、またロッド側はタンク側
へ開放してある。そしてこの第２のブームシリンダ５ｂ
のボトム側とチェック弁１０との間の回路がリリーフ弁
１１を介してタンク側に接続されており、またパイロッ
トチェック弁１２を介して蓄圧器１３とが接続してあ
る。上記ブーム操作弁８はパイロット操作弁装置１４に
て選択的に作用されるパイロット圧力にて切換操作され
る構造になっており、これのブーム上げ側のパイロット
回路１５ａが上記パイロットチェック弁１２のパイロッ
ト作用部に接続されている。なお、１６ａ，１６ｂは吸
込み安全弁である。EXAMPLES Examples of the first invention will be described with reference to the drawings. This embodiment is the case of the backhoe, and in FIG.
Is a swivel frame, 2 is a boom pivoted up and down on the swivel frame 1, 3 is an arm connected to the tip of the boom 2, and 4 is a bucket. Numerals 5a and 5b are first and second boom cylinders for undulating the buff 2, the base end of which is connected to the revolving frame 1 and the tip of the piston rod is connected to the boom 2. 6 is an arm cylinder, and 7 is a bucket cylinder. The two boom cylinders, that is, the first and second boom cylinders 5
Of the a and 5b, the bottom side and rod side of the first boom cylinder 5a are connected to the hydraulic pump 9 via the boom operation valve 8, and the bottom side of the second boom cylinder 5b is connected to the check valve 10. Through the first boom cylinder 5
It is connected to the bottom side of a and the rod side is open to the tank side. And this second boom cylinder 5b
A circuit between the bottom side and the check valve 10 is connected to the tank side via a relief valve 11, and a pressure accumulator 13 is connected via a pilot check valve 12. The boom operation valve 8 is configured to be switched by pilot pressure selectively applied by the pilot operation valve device 14, and the boom raising side pilot circuit 15a of the boom operation valve 8 is the pilot of the pilot check valve 12. It is connected to the action part. Note that 16a and 16b are suction safety valves.
【０００８】上記構成において、パイロット操作弁装置
１４を操作してブーム上げ側のパイロット回路１５ａに
パイロット圧を作用することにより、ブーム操作弁８は
ブーム上げ位置Ａとなり、油圧ポンプ９からの圧油は第
１・第２のブームシリンダ５ａ，５ｂのボトム側へ供給
されてこれが伸長し、ブーム２は上昇する。このとき第
１のブームシリンダ５ａのロッド側の圧油はブーム操作
弁８を介してタンク側へドレンされるが、第２のブーム
シリンダ５ｂのロッド側の圧油は直接タンク側へドレン
される。一方パイロット操作弁装置１４を操作してブー
ム下げ側のパイロット回路１５ｂにパイロット圧を作用
することにより、ブーム用方向切換弁８はブーム下げ位
置Ｂとなり、油圧ポンプ９からの圧油は第１のブームシ
リンダ５ａのロッド側に供給されてこれが短縮し、ブー
ム２は下降する。このとき、第２のブームシリンダ５ｂ
は下降するブーム２により短縮動作される。そしてこの
ときの第２のブームシリンダ５ｂのボトム側の圧油はチ
ェック弁１０にてドレン方向への流れが阻止されている
ので、パイロットチェック弁１２を介して蓄圧器１３に
流入し、これにより、ブーム２の位置エネルギが圧油と
して貯えられる。なおこのときの圧力はリリーフ弁１１
にて設定される。上記状態において、パイロット操作弁
装置１４を操作してブーム操作弁８をブーム上げ位置Ａ
に切換えてブーム２を上昇作動すると、第１・第２のブ
ームシリンダ５ａ，５ｂのボトム側に圧油ポンプ９から
の圧油が供給されて両ブームシリンダ５ａ，５ｂが伸長
動作するが、このとき、ブーム操作弁８のブーム上げ側
のパイロット回路１５ａの圧力によりパイロットチェッ
ク弁１２に作用してこれが開となるので、蓄圧器１３に
貯えられていた圧油が第２のブームシリンダ５ｂのボト
ム側に作用し、この第２のブームシリンダ５ｂの伸長動
は上記蓄圧エネルギによりアシストされ、上記ブーム２
の下降による位置エネルギは回収される。In the above arrangement, the pilot operating valve device 14 is operated to apply a pilot pressure to the pilot circuit 15a on the boom raising side, so that the boom operating valve 8 is at the boom raising position A and the hydraulic oil from the hydraulic pump 9 is applied. Is supplied to the bottom side of the first and second boom cylinders 5a, 5b, which extends, and the boom 2 moves up. At this time, the pressure oil on the rod side of the first boom cylinder 5a is drained to the tank side via the boom operation valve 8, while the pressure oil on the rod side of the second boom cylinder 5b is directly drained to the tank side. .. On the other hand, by operating the pilot operating valve device 14 to apply pilot pressure to the boom lowering side pilot circuit 15b, the boom direction switching valve 8 is at the boom lowering position B, and the pressure oil from the hydraulic pump 9 is the first pressure oil. It is supplied to the rod side of the boom cylinder 5a and shortened, and the boom 2 descends. At this time, the second boom cylinder 5b
Is shortened by the descending boom 2. At this time, the pressure oil on the bottom side of the second boom cylinder 5b is prevented from flowing in the drain direction by the check valve 10, and therefore flows into the pressure accumulator 13 via the pilot check valve 12 and thereby, The potential energy of the boom 2 is stored as pressure oil. The pressure at this time is the relief valve 11
It is set in. In the above state, the pilot operation valve device 14 is operated to move the boom operation valve 8 to the boom raising position A.
When the boom 2 is moved upward by switching to, the pressure oil from the pressure oil pump 9 is supplied to the bottom side of the first and second boom cylinders 5a and 5b, and both boom cylinders 5a and 5b extend. At this time, the pressure of the pilot circuit 15a on the boom raising side of the boom operation valve 8 acts on the pilot check valve 12 to open it, so that the pressure oil stored in the pressure accumulator 13 is released from the bottom of the second boom cylinder 5b. Acting on the side of the boom 2 and the extension movement of the second boom cylinder 5b is assisted by the stored energy.
The potential energy due to the descent of is recovered.
【０００９】なお上記実施例では、第２のブームシリン
ダ５ｂのボトム側回路と蓄圧器１３との間に、ブーム用
方向切換弁８のブーム上げ側のパイロット回路１５ａの
圧力にて開動作するパイロットチェック弁１２を介装し
た例を示したが、これは図２に示すように、ブーム用方
向切換弁８の両パイロット回路１５ａ，１５ｂの圧力に
て開動作する切換弁１８を介装するようにしてもよい。In the above embodiment, the pilot which is opened between the bottom side circuit of the second boom cylinder 5b and the pressure accumulator 13 is operated by the pressure of the boom raising side pilot circuit 15a of the boom direction switching valve 8. An example in which the check valve 12 is provided is shown. However, as shown in FIG. 2, the check valve 12 is provided so that a switching valve 18 that opens by the pressure of both pilot circuits 15a and 15b of the boom direction switching valve 8 is provided. You can
【００１０】図３、図４は本発明の第２の発明の実施例
を示すものであり、この第２の発明は第１の発明をさら
に発展させたものである。第１の発明はローダ、フォー
クリフト等の積込機では何ら問題はないが、バックホー
のように作業機の重量を利用した下方掘削をする機械で
は、作業機を上方積込高さから下方掘削姿勢に作業機を
下降させる場合、切換バルブ８を操作し、ブームシリン
ダのボトム側の圧油をタンクにドレーンすれば作業機の
自重により、作業機は下降する。この時ロッド側が負圧
にならないようにポンプから低圧油を供給してやれば良
い。この時アシストシリンダのボトム側の圧油は蓄圧器
１３に回収され次の作業機上げ操作時に活用される。さ
て、作業機下降後、掘削状態に入った場合、第１の発明
では蓄圧機に圧油が最大限回収された状態であり、アシ
ストシリンダのボトム側は高圧で、その圧により作業機
は浮いた状態となっており、作業機の重量を利用した掘
削（モーメントＬ×Ｗによる掘削）ができない（図８参
照）。そこで、パイロットチェク弁１２とアシストシリ
ンダのボトム側の回路の間にアシスト解除弁１９を介装
すると、下方掘削状態でブームシリンダのロッド側にあ
る一定圧以上がかかった場合、このバルブが切換り、ア
シストシリンダのボトム側回路がタンクにドレーンさ
れ、作業機は自重により落下しようとするため、作業機
の自重を利用した掘削が可能となる。すなわち、第１の
発明では、ブーム２の下降動作時における作業機の位置
エネルギが、これの最大限にわたって蓄圧器１３に貯え
られるので、作業機重量を利用した掘削が行なえない。
第２の発明はこれを改良したもので以下にこの実施例を
第１の発明と異なる部分について説明する。図３に示す
第２の発明の実施例では、第２のブームシリンダ５ｂの
ボトム側とパイロットチェック弁１２との間に、連通位
置Ｃとドレン位置Ｄとを有するアシスト解除弁１９が介
装してある。そしてこのアシスト解除弁１９はばね２０
にて連通位置Ｃ側に付勢されており、また第１のブーム
シリンダ５ａのロッド側の圧力をパイトット圧として上
記ばね２０の付勢に拡してドレン位置Ｄ側に切換わるよ
うになっている。FIG. 3 and FIG. 4 show an embodiment of the second invention of the present invention, and the second invention is a further development of the first invention. The first invention has no problem in loaders such as loaders and forklifts, but in a machine such as a backhoe that performs downward excavation utilizing the weight of the working machine, the working machine is lowered from the upper loading height to a downward excavation posture. When lowering the working machine, if the switching valve 8 is operated and pressure oil on the bottom side of the boom cylinder is drained to the tank, the working machine is lowered due to the weight of the working machine. At this time, low pressure oil may be supplied from the pump so that the rod side does not become negative pressure. At this time, the pressure oil on the bottom side of the assist cylinder is collected in the pressure accumulator 13 and is utilized in the next work machine raising operation. Now, when the excavation state is entered after the working machine descends, in the first invention, the pressure oil is collected to the maximum in the pressure accumulator, the bottom side of the assist cylinder is at a high pressure, and the working machine floats due to the pressure. In this state, excavation using the weight of the working machine (excavation by the moment L × W) cannot be performed (see FIG. 8). Therefore, if an assist release valve 19 is provided between the pilot check valve 12 and the circuit on the bottom side of the assist cylinder, this valve switches when a certain pressure or more on the rod side of the boom cylinder is applied in the downward excavation state. Since the bottom circuit of the assist cylinder is drained to the tank and the working machine tries to fall by its own weight, it is possible to excavate using the own weight of the working machine. That is, in the first aspect of the present invention, the potential energy of the working machine during the lowering operation of the boom 2 is stored in the pressure accumulator 13 to the maximum extent of this, so that excavation using the weight of the working machine cannot be performed.
The second invention is an improvement of this, and the parts different from the first invention will be described below. In the embodiment of the second invention shown in FIG. 3, an assist release valve 19 having a communication position C and a drain position D is provided between the bottom side of the second boom cylinder 5b and the pilot check valve 12. There is. And this assist release valve 19 is provided with a spring 20.
Is urged toward the communication position C side, and the pressure on the rod side of the first boom cylinder 5a is expanded to the urging force of the spring 20 as a pitt pressure so as to switch to the drain position D side. There is.
【００１１】上記構成における第２の発明では、ブーム
操作弁８がブーム下げ位置Ｂに切換ってブーム２が下降
したときに、第１の発明と同等の圧油が蓄圧器１３に位
置エネルギとして貯えられる。そして下方掘削状態で上
記作動において、第１のブームシリンダ５ａのロッド側
の圧力が上記ばね２０の付勢力より大きくなると、アシ
スト解除弁１９がドレン位置Ｄに切換えられ、第２のブ
ームシリンダ５ｂのボトム側がタンク側に開放され、こ
の第２のブームシリンダ５ｂによる下降方向の抵抗が無
くなり、全作業機重量が下降方向へ作用され、この重量
による作業力が上記第１のブームシリンダ５ａによる下
降動作に加算され、重量利用の掘削が行なわれる。ブー
ム２の上昇時には、第１の発明と同様に、蓄圧器１３に
貯えられた位置エネルギが第２のブームシリンダ５ｂに
作用してアシストされる。なおこの第２の実施例におけ
るアシスト解除弁１９の構成を図４に示すように、ばね
２０のかわりに、ブーム操作弁８のパイロット圧力にて
連通位置Ｃ側へ付勢する構成のアシスト解除弁１９ａに
してもよい。このようにするとアシスト解除弁１９ａが
パイロットチェック弁１２の作用をも兼ねることがで
き、回路を簡単にすることができる。In the second aspect of the present invention, when the boom operating valve 8 is switched to the boom lowering position B and the boom 2 is lowered, the same pressure oil as in the first aspect is stored in the pressure accumulator 13 as potential energy. Be stored. When the rod side pressure of the first boom cylinder 5a becomes larger than the urging force of the spring 20 in the above operation in the downward excavation state, the assist release valve 19 is switched to the drain position D, and the second boom cylinder 5b moves. The bottom side is opened to the tank side, the resistance in the descending direction by the second boom cylinder 5b disappears, the weight of the entire work machine is acted in the descending direction, and the working force due to this weight is descended by the first boom cylinder 5a. Is added to, and excavation using weight is performed. When the boom 2 is raised, the potential energy stored in the pressure accumulator 13 acts on the second boom cylinder 5b to be assisted, as in the first aspect of the invention. As shown in FIG. 4, the assist release valve 19 of the second embodiment has a structure in which instead of the spring 20, the pilot pressure of the boom operation valve 8 biases the assist release valve 19 toward the communication position C. It may be 19a. In this way, the assist release valve 19a can also serve as the pilot check valve 12, and the circuit can be simplified.
【００１２】図５に示す第３の発明は第２の発明（図
３、図４）をさらに発展させたものであり、第２のブー
ムシリンダ５ｂのボトム側とパイロットチェック弁１２
の間に介装するアシスト解除弁１９ｂに方向切換弁の機
能を追加して、第１のブームシリンダ５ａのロッド側の
圧力がばね２０による付勢力より大きくなってアシスト
解除弁１９ｂがドレン位置Ｄに切換ったときに、第２の
ブームシリンダ５ｂのロッド側に圧油が供給され、作業
機重量のほかに第１・第２の２本のブームシリンダ５
ａ，５ｂによりブーム２の下降掘削動作がなされる。A third invention shown in FIG. 5 is a further development of the second invention (FIGS. 3 and 4), and it comprises the bottom side of the second boom cylinder 5b and the pilot check valve 12.
By adding the function of a direction switching valve to the assist release valve 19b interposed between the first release cylinder 19a and the first release cylinder 19a, the pressure on the rod side of the first boom cylinder 5a becomes larger than the urging force of the spring 20, and the assist release valve 19b moves to the drain position D. When switched to, the pressure oil is supplied to the rod side of the second boom cylinder 5b, and in addition to the weight of the working machine, the first and second boom cylinders 5
The descending excavation operation of the boom 2 is performed by a and 5b.
【００１３】この第３の発明の実施例におけるアシスト
解除弁１９ｂは図６に示すようにばね２０のかわりに、
ブーム操作弁８の操作パイロット圧にて連通位置Ｃ側に
切換える構成のアシスト解除弁１９ｃにしてもよい。こ
の場合アシスト解除弁１９ｃがパイロットチェック弁１
２の作用をする。図７はこの第３の発明の実施例のさら
に異なる実施例を示すもので、第１のブームシリンダ５
ａのロッド側の圧力とブーム操作弁８の操作用パイロッ
ト圧で切換わるアシスト解除弁１９ｂを設けると共に、
第１のブームシリンダ５ａのボトム側の圧力が所定値以
上になったときに、両ブームシリンダ５ａ，５ｂのロッ
ド側を連通する切換弁２１が設けてある。この図に示す
実施例は図６に示すものと略同様の作用が行なわれる。
この第３の発明の実施例を示す図５、図６において、２
２は吸込み安全弁である。なお上記第２の発明の実施例
における各アシスト解除弁１９，１９ａ，１９ｂ，１９
ｃの切換えは、手動操作によってもよい。The assist release valve 19b in the third embodiment of the invention is replaced by a spring 20 as shown in FIG.
The assist release valve 19c may be configured to be switched to the communication position C side by the operation pilot pressure of the boom operation valve 8. In this case, the assist release valve 19c is the pilot check valve 1
It acts as 2. FIG. 7 shows a further different embodiment from the embodiment of the third invention, that is, the first boom cylinder 5
An assist release valve 19b that switches between the rod side pressure of a and the operating pilot pressure of the boom operating valve 8 is provided, and
A switching valve 21 is provided to connect the rod sides of both boom cylinders 5a and 5b when the pressure on the bottom side of the first boom cylinder 5a exceeds a predetermined value. The embodiment shown in this figure performs substantially the same operation as that shown in FIG.
5 and 6 showing the embodiment of the third invention, 2
2 is a suction safety valve. The assist release valves 19, 19a, 19b, 19 in the embodiment of the second invention described above.
The switching of c may be performed manually.
【００１４】[0014]
【発明の効果】本発明によれば、２本用いる第１・第２
のブームシリンダ５ａ，５ｂのうちの１本のブームシリ
ンダ５ｂにて作業機の位置エネルギの回収を行なうこと
ができることにより、例えばバックホーのように標準仕
様の昇降作業機においては、従来用いられていた位置エ
ネルギ回収専用のシリンダが不要となり、構造が簡単
で、かつコストダウンを図ることができる。また上記位
置エネルギの回収によるアシスト動作を所定の条件下で
解除して作業機の下降掘削時に、この作業機の位置エネ
ルギをそのまま利用することもできる。そしてさらにア
シスト解除弁の切換えによって、全ての昇降シリンダに
て上昇動作のほかに作業機の下降掘削動作をも行なうこ
とができる。According to the present invention, the first and second use of two
Since one of the boom cylinders 5a, 5b can recover the potential energy of the working machine, it has been conventionally used in a standard specification lifting work machine such as a backhoe. A cylinder dedicated to recovering potential energy is not required, the structure is simple, and the cost can be reduced. Further, it is also possible to cancel the assist operation by the recovery of the potential energy under a predetermined condition and use the potential energy of the work machine as it is when the work machine is descended and excavated. Further, by switching the assist release valve, not only the raising operation but also the descending excavation operation of the working machine can be performed in all the lifting cylinders.
【図１】第１の発明を示す概略的な構成説明図である。FIG. 1 is a schematic configuration explanatory view showing a first invention.
【図２】第１の発明の異なる構成を示す説明図である。FIG. 2 is an explanatory diagram showing a different configuration of the first invention.
【図３】第２の発明を示す概略的な構成説明図である。FIG. 3 is a schematic configuration explanatory view showing a second invention.
【図４】第２の発明の異なる構成を示す概略的な構成説
明図である。FIG. 4 is a schematic configuration explanatory view showing a different configuration of the second invention.
【図５】第３の発明を示す概略的な構成説明図である。FIG. 5 is a schematic configuration explanatory view showing a third invention.
【図６】第３の発明の異なる構成を示す概略的な構成説
明図である。FIG. 6 is a schematic configuration explanatory view showing a different configuration of the third invention.
【図７】第３の発明の異なる構成を示す概略的な構成説
明図である。FIG. 7 is a schematic configuration explanatory view showing a different configuration of the third invention.
【図８】第１の発明の問題点を示す説明図である。FIG. 8 is an explanatory diagram showing a problem of the first invention.
【図９】従来例を示す構成説明図である。FIG. 9 is a configuration explanatory view showing a conventional example.
１…旋回フレーム、２…ブーム、３…アーム、４…バケ
ット、５ａ、５ｂ…第１・第２のブームシリンダ、８…
ブーム操作弁、９…油圧ポンプ、１０…チェック弁、１
１…リリーフ弁、１２…パイロットチェック弁、１３…
蓄圧器、１４…パイロット操作弁装置、１５ａ、１５ｂ
…パイロット回路、１９、１９ａ、１９ｂ、１９ｃ…ア
シスト解除弁、２０…ばね。1 ... Revolving frame, 2 ... Boom, 3 ... Arm, 4 ... Bucket, 5a, 5b ... 1st and 2nd boom cylinders, 8 ...
Boom control valve, 9 ... hydraulic pump, 10 ... check valve, 1
1 ... Relief valve, 12 ... Pilot check valve, 13 ...
Accumulator, 14 ... Pilot operated valve device, 15a, 15b
... Pilot circuit, 19, 19a, 19b, 19c ... Assist release valve, 20 ... Spring.
Claims (3)
のうちの少なくとも１本の昇降シリンダのボトム側とロ
ッド側を昇降操作弁を介して油圧ポンプに接続し、上記
昇降シリンダの少なくとも他の１本の昇降シリンダをア
シストシリンダとし、このアシストシリンダのボトム側
をチェック弁を介して昇降操作弁に接続し、また、パイ
ロットチェック弁を介して蓄圧器に接続すると共に、リ
リーフ弁を介してタンク側に接続し、またロッド側をタ
ンクに接続したことを特徴とする昇降作業機の位置エネ
ルギ回収装置。1. A bottom side and a rod side of at least one elevating cylinder of a plurality of elevating cylinders for elevating and lowering a working machine are connected to a hydraulic pump via an elevating operation valve, and at least another of the elevating cylinders. One lift cylinder is used as an assist cylinder, and the bottom side of this assist cylinder is connected to a lift operation valve via a check valve, and is connected to a pressure accumulator via a pilot check valve and a tank via a relief valve. And a rod side is connected to a tank, a potential energy recovery device for a lifting work machine.
ネルギ回収装置において、アシストシリンダのボトム側
とパイロットチェック弁との間に、ボトム側をパイロッ
トチェック弁側へ連通する連通位置とドレンするドレン
位置とを有するアシスト解除弁を介装したことを特徴と
する昇降作業機の位置エネルギ回収装置。2. The potential energy recovery device for a hoisting work machine according to claim 1, wherein the bottom side of the assist cylinder and the pilot check valve are connected to a communication position where the bottom side communicates with the pilot check valve side. A potential energy recovery device for a lifting work machine, wherein an assist release valve having a drain position is provided.
ネルギ回収装置において、アシスト解除弁に、このアシ
スト解除弁がドレン位置のときに、ポンプからの圧油を
アシストシリンダのロッド側へ供給するポートを有する
ことを特徴とする昇降作業機の位置エネルギ回収装置。3. The potential energy recovery device for a hoisting work machine according to claim 2, wherein the assist release valve supplies pressure oil from the pump to the rod side of the assist cylinder when the assist release valve is at the drain position. A potential energy recovery device for a lifting / lowering work machine, which has a port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03351349A JP3129495B2 (en) | 1991-12-13 | 1991-12-13 | Potential energy recovery device for lifting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03351349A JP3129495B2 (en) | 1991-12-13 | 1991-12-13 | Potential energy recovery device for lifting machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05163745A true JPH05163745A (en) | 1993-06-29 |
| JP3129495B2 JP3129495B2 (en) | 2001-01-29 |
Family
ID=18416702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03351349A Expired - Fee Related JP3129495B2 (en) | 1991-12-13 | 1991-12-13 | Potential energy recovery device for lifting machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3129495B2 (en) |
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| WO1999007950A1 (en) * | 1997-08-11 | 1999-02-18 | Mannesmann Rexroth Ag | Hydraulic control device for a mobile machine, especially for a wheel loader |
| EP1157963A2 (en) * | 2000-05-25 | 2001-11-28 | J.C. Bamford Excavators Limited | Hydraulic system for wheeled loader |
| EP1172488A1 (en) * | 1999-12-22 | 2002-01-16 | Shin Caterpillar Mitsubishi Ltd. | Hydraulic circuit of working machine |
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| US6260355B1 (en) | 1997-03-21 | 2001-07-17 | Mannesmann Rexroth Ag | Hydraulic control system for a mobile work machine, especially a wheel loader |
| WO1998042923A1 (en) * | 1997-03-21 | 1998-10-01 | Mannesmann Rexroth Ag | Hydraulic control system for a mobile work machine, especially a wheel loader |
| WO1999007950A1 (en) * | 1997-08-11 | 1999-02-18 | Mannesmann Rexroth Ag | Hydraulic control device for a mobile machine, especially for a wheel loader |
| US6370874B1 (en) | 1997-08-11 | 2002-04-16 | Mannesmann Rexroth Ag | Hydraulic control device for a mobile machine, especially for a wheel loader |
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| EP1172488A1 (en) * | 1999-12-22 | 2002-01-16 | Shin Caterpillar Mitsubishi Ltd. | Hydraulic circuit of working machine |
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| JP2008014440A (en) * | 2006-07-07 | 2008-01-24 | Shin Caterpillar Mitsubishi Ltd | Hydraulic control system of working machine |
| WO2010089518A1 (en) * | 2009-02-09 | 2010-08-12 | Manu Lorraine | Hydraulic system for a handling or earthmoving machine with an energy accumulator |
| FR2941976A1 (en) * | 2009-02-09 | 2010-08-13 | Manu Lorraine | HYDRAULIC SYSTEM OF HANDLING OR EARTHING EQUIPMENT WITH ENERGY ACCUMULATOR |
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| KR20130137211A (en) * | 2011-03-21 | 2013-12-16 | 슈앙라이 양 | Lifting system and lifting method for jib of project machine and project machine thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |