JPS6238973U

JPS6238973U -

Info

Publication number: JPS6238973U
Application number: JP12841685U
Authority: JP
Priority date: 1985-08-23
Filing date: 1985-08-23
Publication date: 1987-03-07

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す概略回路図、
第２図は従来例を示す概略回路図である。１，２……ポンプ、３，４……複合制御弁、７
……切換弁、１２……シリンダ、１４……セレク
タ弁、１６……タンク、１８……バイパス通路、
１９……タンク通路、２０……ロジツク弁、２０
ａ……パイロツト室、２２……合流回路、２４，
２５，２６……逆止弁、２７……第１の供給ポー
ト、２８……第２の供給ポート。 FIG. 1 is a schematic circuit diagram showing an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram showing a conventional example. 1, 2...Pump, 3, 4...Combined control valve, 7
...Switching valve, 12...Cylinder, 14...Selector valve, 16...Tank, 18...Bypass passage,
19...Tank passage, 20...Logic valve, 20
a...Pilot room, 22...Merge circuit, 24,
25, 26... Check valve, 27... First supply port, 28... Second supply port.

Claims

[Claims for Utility Model Registration] Composite control valves each connected to a plurality of pumps, a selector valve that is switched in conjunction with the switching valve of the composite control valve on one side, and a bypass passage and a tank passage of the composite control valve on the other side. A logic valve is provided between the pilot chamber and the tank and opens and closes by communicating and cutting off the pilot chamber and the tank using the selector valve, and the switching valve controls discharge oil of the other side pump in accordance with a decrease in the opening of the logic valve. In a merging hydraulic circuit consisting of a passageway that merges with and supplies oil discharged from the one-side pump to one side of the cylinder, the switching valve connects the oil discharged from the one-side pump to one side of the cylinder through a check valve connected to each of the switching valves. A hydraulic pump characterized in that the supply port on one side is connected to the pump on the other side so as to receive oil discharged from the pump on the other side via another check valve different from the above-mentioned one. Shovel hydraulic circuit.