JPS6184203U

JPS6184203U -

Info

Publication number: JPS6184203U
Application number: JP16857484U
Authority: JP
Priority date: 1984-11-08
Filing date: 1984-11-08
Publication date: 1986-06-03

Description

[Brief explanation of the drawing]

第１図は２個１組のジヤツキシリンダを２組配
備したものに適用した本考案の一実施例を示す回
路図、第２図はジヤツキシリンダを使用する大型
重量物としての大型トラツククレーンを示す図、
第３図および第４図はジヤツキシリンダを使用し
て行うトラツククレーンの分解、組立状態を示す
側面図および背面図、第５図は従来技術を示す回
路図である。６ａ〜６ｄ……油圧シリンダとしてのジヤツキ
シリンダ、７……油圧ポンプ、９……メインコン
トロールバルブ、１０……伸長側駆動回路、１１
……縮小側駆動回路、１１ａ〜１１ｄ……縮小側
駆動回路とジヤツキシリンダのロツド側油室とを
結ぶ分岐管路、１５……主分、集流弁としての第
１の分、集流弁、１８，１９……２個のコントロ
ールバルブに対して１個宛配備された分、集流弁
としての第２、第３の分、集流弁、２０ａ〜２０
ｄ……第２、第３の分、集流弁の分流ポートと第
１〜第４のコントロールバルブとを結ぶ管路、２
１ａ〜２１ｄ……ジヤツキシリンダに対応させて
設けられた第１〜第４のコントロールバルブ、２
２ａ〜２２ｄ……第１〜第４のコントロールバル
ブとジヤツキシリンダのヘツド側油室とを結ぶ管
路、２５……油タンク、２６……切換弁、２６ａ
，２６ｂ，２６ｃ……切換弁の第１、第２、第３
のポート、２７……切換弁の第１のポートと第１
〜第４のコントロールバルブとを結ぶ管路、２８
……同第２のポートと油タンクとを結ぶ管路、２
９……同第３のポートと縮小側駆動回路とを結ぶ
管路。 Fig. 1 is a circuit diagram showing an embodiment of the present invention applied to two sets of two jack cylinders, and Fig. 2 is a large truck crane as a large heavy object using jack cylinders. A diagram showing
3 and 4 are side and rear views showing disassembly and assembly of a truck crane using a jack cylinder, and FIG. 5 is a circuit diagram showing the prior art. 6a to 6d...Jax cylinder as a hydraulic cylinder, 7...Hydraulic pump, 9...Main control valve, 10...Extension side drive circuit, 11
...Reduction side drive circuit, 11a to 11d... Branch pipe connecting the reduction side drive circuit and the rod side oil chamber of the cylinder, 15... Main portion, first portion as a flow collector valve, flow collection Valves, 18, 19... one for two control valves, second and third valves as flow collector valves, flow collector valves, 20a to 20
d... Second and third portions, pipe lines connecting the branch ports of the collector valve and the first to fourth control valves, 2
1a to 21d...first to fourth control valves provided corresponding to the jack cylinder, 2
2a to 22d...Pipe line connecting the first to fourth control valves and the head side oil chamber of the jack cylinder, 25...Oil tank, 26...Switching valve, 26a
, 26b, 26c...the first, second, and third switching valves
port, 27...the first port of the switching valve and the first
~ Pipe line connecting with the fourth control valve, 28
... Pipe line connecting the second port and the oil tank, 2
9... A conduit connecting the third port and the reduction side drive circuit.

Claims

[Scope of utility model registration request]

By deploying multiple sets of two hydraulic cylinders and switching the main control valve, when the hydraulic cylinder is extended, the pressure oil discharged from the hydraulic pump is routed through the extension side drive circuit → main branch, collector valve → One control valve is installed for every two control valves, and the flow is supplied to the oil chamber on the cylinder head side of each hydraulic cylinder through the control valve provided corresponding to each hydraulic cylinder. At least the first, second,
A switching valve having a third port is installed, and the first port of the switching valve is connected to a port that communicates with an oil tank of a control valve provided corresponding to each of the hydraulic cylinders, and the switching valve A control circuit for a hydraulic cylinder, characterized in that a second port of the switching valve is connected to the first port and an oil tank, and a third port of the switching valve is connected to a reduction side drive circuit.