JPH0352269Y2 - - Google Patents
Info
- Publication number
- JPH0352269Y2 JPH0352269Y2 JP1983120774U JP12077483U JPH0352269Y2 JP H0352269 Y2 JPH0352269 Y2 JP H0352269Y2 JP 1983120774 U JP1983120774 U JP 1983120774U JP 12077483 U JP12077483 U JP 12077483U JP H0352269 Y2 JPH0352269 Y2 JP H0352269Y2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- pressure accumulator
- cancel
- oil
- bottom side
- 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
- 238000010276 construction Methods 0.000 claims description 9
- 238000005381 potential energy Methods 0.000 claims description 4
- 230000006866 deterioration Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
Landscapes
- Operation Control Of Excavators (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
- Fluid-Pressure Circuits (AREA)
Description
【考案の詳細な説明】
本考案は液圧式建設機械の液圧回路装置に関す
るものである。[Detailed Description of the Invention] The present invention relates to a hydraulic circuit device for a hydraulic construction machine.
本出願人は実願昭55−130238号においてブーム
シリンダ１により上下動する作業機を有する建設
機械にブームシリンダ１と並設して用いられ、作
業機の下降による位置エネルギを蓄圧器３に蓄積
するようにしたものにおいて、このキヤンセルシ
リンダ２のボトム側を蓄圧器３に接続すると共
に、ストツパ弁１０を介してブームシリンダ１の
上昇側回路３ａに接続し、またこのロツド側を並
列にしたりリリーフ弁１２、チエツク弁１１を介
してサブタンク９に接続した液圧回路装置を提唱
した。なお４，６，７はメインバルブ群、５，
８，８′はメインポンプである。 In Utility Application No. 55-130238, the present applicant proposed a construction machine that is installed in parallel with the boom cylinder 1 in a construction machine that has a working machine that moves up and down with a boom cylinder 1, and stores potential energy in a pressure accumulator 3 due to the lowering of the working machine. In this case, the bottom side of the cancel cylinder 2 is connected to the pressure accumulator 3, and also connected to the rising side circuit 3a of the boom cylinder 1 via the stopper valve 10, and the rod side is connected in parallel or as a relief. A hydraulic circuit device connected to the sub-tank 9 via a valve 12 and a check valve 11 was proposed. Note that 4, 6, and 7 are the main valve group;
8 and 8' are main pumps.
しかし、これはストツプ弁よりキヤンセルシリ
ンダ側が閉回路であつたためサブタンク９を必要
としていた。またブームシリンダ１伸し時、キヤ
ンセルシリンダ２も伸ばされるが一定ストローク
以上になると蓄圧器３からの圧油の補給がなくな
り、キヤンセルシリンダ２のボトム側には補助タ
ンク９からチエツク弁１１を介して油が補充され
る。この時サブタンク９内の空気が油と混ぜ合わ
されチエツク弁１１から蓄圧器３側回路に浸入し
てくるため徐々にサブタンク９側の空気が減少
し、その状態でリリーフ弁１２からリリーフする
と、サブタンク９が高圧となり危険であつたし、
またこのときリリーフ弁１２の背圧が高くなるた
め蓄圧器３側の回路圧が上がるため危険であつ
た。 However, this required the sub-tank 9 because the side closer to the cancel cylinder than the stop valve was a closed circuit. Furthermore, when the boom cylinder 1 is extended, the cancel cylinder 2 is also extended, but when the stroke exceeds a certain level, pressure oil is no longer supplied from the pressure accumulator 3, and the bottom side of the cancel cylinder 2 is supplied with pressure oil from the auxiliary tank 9 via the check valve 11. Oil is replenished. At this time, the air in the sub tank 9 is mixed with oil and enters the pressure accumulator 3 side circuit from the check valve 11, so the air in the sub tank 9 gradually decreases. The pressure is high and it is dangerous.
Further, at this time, the back pressure of the relief valve 12 becomes high, which causes the circuit pressure on the pressure accumulator 3 side to rise, which is dangerous.
また閉回路であるためオイルが劣化していた
し、蓄圧器に貯えた液体をエネルギーとして放出
する際断熱膨張のため、蓄圧器３の温度が急激に
下がりまた貯圧する際断熱圧縮のため温度が急上
昇しプラダ型の蓄圧器３では破損のおそれが大で
あつた。 In addition, since it is a closed circuit, the oil has deteriorated, and when the liquid stored in the pressure accumulator is released as energy due to adiabatic expansion, the temperature of pressure accumulator 3 drops rapidly, and when the pressure is stored, the temperature rises rapidly due to adiabatic compression. However, there was a high risk of damage to the Prada type accumulator 3.
本考案は上記の事情に鑑みなされたものであつ
て、その目的とするところはキヤンセルシリンダ
のボトム側への油の封入を充分な油でもつて空気
が混入することなく容易に行うことができるし、
またセミ閉回路となり、空気の混入がないため、
蓄圧器側の回路圧が上がる危険がなくなるし、油
は時々タンクに出入りしていて劣化のおそれはな
く更に蓄圧器の破損のおそれのない液圧建設機械
の液圧回路装置を提供することにある。 The present invention was developed in view of the above circumstances, and its purpose is to easily fill the bottom side of the cancel cylinder with oil without introducing air into the bottom side of the cancel cylinder. ,
Also, since it is a semi-closed circuit and there is no air contamination,
To provide a hydraulic circuit device for a hydraulic construction machine in which there is no danger of the circuit pressure increasing on the pressure accumulator side, there is no risk of deterioration due to oil occasionally going in and out of the tank, and there is no risk of damage to the pressure accumulator. be.
以下、本考案を第２図以下を参照して説明す
る。 Hereinafter, the present invention will be explained with reference to FIG. 2 and subsequent figures.
図面中１４，１５，１６はメインバルブ群であ
り、１１，１２，１３はメインポンプである。 In the drawing, 14, 15, and 16 are main valve groups, and 11, 12, and 13 are main pumps.
各メインバルブ群１４，１５，１６が備えるブ
ーム切換弁２４，２５，２６のポート２４Ａ，２
５Ａ，２６Ａはブームシリンダ１７のボトム側に
管路２７，２８，２９を介して接続してあり、ブ
ーム切換弁２４，２５，２６のポート２４Ｂ，２
５Ｂ，２６Ｂはブームシリンダ１７のロツド側に
管路３０，３１，３２を介して接続してある。 Ports 24A, 2 of boom switching valves 24, 25, 26 provided in each main valve group 14, 15, 16
5A, 26A are connected to the bottom side of the boom cylinder 17 via pipes 27, 28, 29, and are connected to the ports 24B, 2 of the boom switching valves 24, 25, 26.
5B and 26B are connected to the rod side of the boom cylinder 17 via conduits 30, 31, and 32.
ブームシリンダ１７のボトム側はストツプ弁２
１を介してキヤンセルシリンダ１９のボトム側と
蓄圧器１８に接続されている。またブームシリン
ダ１７のボトム側は管路３３，３４，３５を介し
てキヤンセルシリンダ１９のヘツド側およびロツ
ド側に接続してあり、管路３４にリリーフ弁２０
が設けてあり、管路３５にチエツク弁２２が設け
てある。 The bottom side of the boom cylinder 17 is the stop valve 2.
1 to the bottom side of the cancel cylinder 19 and the pressure accumulator 18. The bottom side of the boom cylinder 17 is connected to the head side and rod side of the cancel cylinder 19 via pipes 33, 34, and 35, and a relief valve 20 is connected to the pipe 34.
A check valve 22 is provided in the conduit 35.
また管路３３，３４，３５の合流部３６にはス
トツプ弁２１と蓄圧器１８とが設けてある。蓄圧
器１８はピストン型であつて、内部にピストン３
７を備えている。 Further, a stop valve 21 and a pressure accumulator 18 are provided at a junction 36 of the pipes 33, 34, and 35. The pressure accumulator 18 is of a piston type, and has a piston 3 inside.
It has 7.
キヤンセルシリンダ１９のロツド側はもどり管
路３８を介してタンク２３に通じている。 The rod side of the cancel cylinder 19 communicates with the tank 23 via a return line 38.
また、ブーム切換弁２４，２５，２６のタンク
ポート２４Ｃ，２５Ｃ，２６Ｃはタンク２３に通
じている。 Further, tank ports 24C, 25C, and 26C of the boom switching valves 24, 25, and 26 communicate with the tank 23.
しかして、キヤンセルシリンダ１９のヘツド側
に油を封入するときはストツプ弁２１を開として
からブームシリンダ１７のピン間距離Ｌを最短の
状態から徐々に伸長させる。 Therefore, when filling the head side of the cancel cylinder 19 with oil, the stop valve 21 is opened and the distance L between the pins of the boom cylinder 17 is gradually increased from the shortest state.
かくするとブームシリンダ１７の伸長と共に、
ストツパ弁２１からキヤンセルシリンダ１９のボ
トム側へポンプ１１，１２，１３，からの油が強
制的に流入される。ブームシリンダ１７がそのピ
ン間距離Ｌが最長となるまで伸長するとキヤンセ
ルシリンダ１９のボトム側の油量は最大となり、
ボトム側は油で充満される。この状態でストツプ
弁２１を閉じることによりキヤンセルシリンダ１
９はブームシリンダ回路より切り離されてキヤン
セルシリンダ１９のボム側にセミ閉回路になる。
その後のキヤンセルシリンダ１９は従来のキヤン
セルシリンダ１９と同一に作動し、ブーム４０の
下降時には、ボトム側内の油が蓄圧器１８内に入
り、作業機の位置エネルギが蓄積される。蓄圧器
１８の最高作動圧力以上にピン間距離Ｌが短縮さ
れるとリリーフ弁２０からボトム側の油量はロツ
ド側へ流入する。 Thus, with the extension of the boom cylinder 17,
Oil from the pumps 11, 12, 13 is forced to flow into the bottom side of the cancel cylinder 19 from the stopper valve 21. When the boom cylinder 17 extends until the distance L between its pins becomes the maximum, the amount of oil on the bottom side of the cancel cylinder 19 becomes maximum.
The bottom side is filled with oil. By closing the stop valve 21 in this state, the cancel cylinder 1
9 is separated from the boom cylinder circuit and becomes a semi-closed circuit on the bomb side of the cancel cylinder 19.
Thereafter, the cancel cylinder 19 operates in the same manner as the conventional cancel cylinder 19, and when the boom 40 is lowered, the oil in the bottom side enters the pressure accumulator 18, and the potential energy of the working machine is stored. When the distance L between the pins is shortened beyond the maximum operating pressure of the pressure accumulator 18, the oil amount on the bottom side from the relief valve 20 flows into the rod side.
ここでセミ閉回路とは、キヤンセルシリンダ１
９のボトム側は閉回路となつておりまたロツド側
はタンクに接続されて閉回路になつていることを
言う。 Here, the semi-closed circuit refers to the cancel cylinder 1
The bottom side of 9 is a closed circuit, and the rod side is connected to the tank, making it a closed circuit.
キヤンセルシリンダ１９のボトム側閉回路とは
言えチエツク弁２２、リリーフ弁２０を介してロ
ツド側へ接続されているので、キヤンセルシリン
ダ１９がある一定ストローク以上移動し蓄圧器１
８からの圧油の補充がなくなつた状態でボトム側
の圧力がロツド側の圧力より下がつた時、チエツ
ク弁２２を介して油がロツド側よりボトム側へ吸
い込まれ、またキヤンセルシリンダ１９が縮む時
ある一定圧（リリーフ弁２０のセツト圧）になる
までは蓄圧器１８に蓄圧されるが、それ以上縮む
時に油はリリーフ弁２０からリリーフされる。こ
のように油は時々タンクに出入していて劣化のお
それはなく更に蓄圧器１８の破損のおそれがな
い。 Although it is a closed circuit on the bottom side of the cancel cylinder 19, it is connected to the rod side via the check valve 22 and the relief valve 20, so if the cancel cylinder 19 moves more than a certain stroke, the pressure accumulator 1
When the pressure on the bottom side drops below the pressure on the rod side with pressure oil no longer being replenished from the cylinder 8, oil is sucked from the rod side to the bottom side via the check valve 22, and the cancel cylinder 19 is activated. When the oil contracts, the pressure is accumulated in the pressure accumulator 18 until it reaches a certain pressure (the set pressure of the relief valve 20), but when the oil contracts further, the oil is relieved from the relief valve 20. In this way, oil flows in and out of the tank from time to time, and there is no risk of deterioration and furthermore, there is no risk of damage to the pressure accumulator 18.
本考案は以上詳述したようになり、ブームシリ
ンダ１７により上下動する作業機を有する建設機
械にブームシリンダ１７と並設して用いられ、作
業機の下降による位置エネルギを蓄圧器１８に蓄
積するようにしたものにおいて、蓄圧器１８にピ
ストン型の蓄圧器を用い、ブームシリンダ１７の
ボトム側をストツプ弁２１を介して蓄圧器１８に
接続し、キヤンセルシリンダ１９のボトム側を蓄
圧器１８に接続し、キヤンセルシリンダ１９のロ
ツド側を、並列にしたリリーフ弁２０とチエツク
弁２２を介して蓄圧器１８に接続すると共にキヤ
ンセルシリンダ１９のロツド側をもどり管路を介
してタンク２３に接続したから、キヤンセルシリ
ンダ１９のボトム側への油の封入をブームシリン
ダ１７を上昇するための油により強制的に行なわ
れ、このときの油の封入を充分な油量でもつて空
気が混入することなく容易に行なうことができ
る。 The present invention has been described in detail above, and is used in a construction machine having a working machine that is moved up and down by the boom cylinder 17 in parallel with the boom cylinder 17, and stores potential energy in the pressure accumulator 18 due to the lowering of the working machine. In the pressure accumulator 18, a piston-type pressure accumulator is used, the bottom side of the boom cylinder 17 is connected to the pressure accumulator 18 via the stop valve 21, and the bottom side of the cancel cylinder 19 is connected to the pressure accumulator 18. However, the rod side of the cancel cylinder 19 is connected to the pressure accumulator 18 via the parallel relief valve 20 and check valve 22, and the rod side of the cancel cylinder 19 is connected to the tank 23 via the return pipe. Oil is forcibly filled into the bottom side of the cancel cylinder 19 using oil for raising the boom cylinder 17, and the oil filling at this time is easily done with a sufficient amount of oil and without air being mixed in. be able to.
またセミ閉回路となり、空気の混入がないた
め、蓄圧器１８側の回路圧が上がる危険がなくな
るし、オイルは常時タンク２３に出入していて劣
化のおそれはなく、更にピストン型蓄圧器を用い
たので蓄圧器１８の破損の心配はなくなる。 In addition, since it is a semi-closed circuit and there is no air mixed in, there is no risk of the circuit pressure on the pressure accumulator 18 side rising, oil is constantly flowing in and out of the tank 23, so there is no risk of deterioration, and a piston type pressure accumulator is used. Therefore, there is no need to worry about damage to the pressure accumulator 18.
第１図は従来の液圧式建設機械の液圧回路装置
の構成説明図、第２図は本考案の一実施例の構成
説明図、第３図は同説明図である。
１７はブームシリンダ、１８は蓄圧器、１９は
キヤンセルシリンダ、２０はリリーフ弁、２２は
チエツク弁。
FIG. 1 is an explanatory diagram of the configuration of a conventional hydraulic circuit device of a hydraulic construction machine, FIG. 2 is an explanatory diagram of the configuration of an embodiment of the present invention, and FIG. 3 is an explanatory diagram of the same. 17 is a boom cylinder, 18 is a pressure accumulator, 19 is a cancel cylinder, 20 is a relief valve, and 22 is a check valve.
Claims (1)
有する建設機械にブームシリンダ１７と並設して
用いられ、作業機の下降による位置エネルギを蓄
圧器１８に蓄積するようにしたものにおいて、蓄
圧器１８にピストン型の蓄圧器を用い、ブームシ
リンダ１７のボトム側をストツプ弁２１を介して
蓄圧器１８に接続し、キヤンセルシリンダ１９の
ボトム側を蓄圧器１８に接続し、キヤンセルシリ
ンダ１９のロツド側を、並列にしたリリーフ弁２
０とチエツク弁２２を介して蓄圧器１８に接続す
ると共にキヤンセルシリンダ１９のロツド側をも
どり管路を介してタンク２３に接続したことを特
徴とする液圧式建設機械の液圧回路装置。 This construction machine is installed in parallel with the boom cylinder 17 in a construction machine having a working machine that moves up and down by the boom cylinder 17, and the potential energy caused by the lowering of the working machine is stored in the pressure accumulator 18. The bottom side of the boom cylinder 17 is connected to the pressure accumulator 18 via the stop valve 21, the bottom side of the cancel cylinder 19 is connected to the pressure accumulator 18, and the rod side of the cancel cylinder 19 is connected in parallel. Relief valve 2
A hydraulic circuit device for a hydraulic construction machine, characterized in that it is connected to a pressure accumulator 18 through a check valve 22, and a rod side of a cancel cylinder 19 is connected to a tank 23 through a return pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12077483U JPS6032460U (en) | 1983-08-04 | 1983-08-04 | Hydraulic circuit device for hydraulic construction machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12077483U JPS6032460U (en) | 1983-08-04 | 1983-08-04 | Hydraulic circuit device for hydraulic construction machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6032460U JPS6032460U (en) | 1985-03-05 |
| JPH0352269Y2 true JPH0352269Y2 (en) | 1991-11-12 |
Family
ID=30276665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12077483U Granted JPS6032460U (en) | 1983-08-04 | 1983-08-04 | Hydraulic circuit device for hydraulic construction machinery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6032460U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS541420A (en) * | 1977-06-06 | 1979-01-08 | Sugimura Kazuo | Nonnopen method of withdrawing leaked oil form gas chamber of piston accumulator |
| JPS5756844B2 (en) * | 1979-03-27 | 1982-12-01 | Iseki Agricult Mach |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5756844U (en) * | 1980-09-16 | 1982-04-03 |
-
1983
- 1983-08-04 JP JP12077483U patent/JPS6032460U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS541420A (en) * | 1977-06-06 | 1979-01-08 | Sugimura Kazuo | Nonnopen method of withdrawing leaked oil form gas chamber of piston accumulator |
| JPS5756844B2 (en) * | 1979-03-27 | 1982-12-01 | Iseki Agricult Mach |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6032460U (en) | 1985-03-05 |
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