Hydraulic circuit for swing motion

Abstract

Abstract PURPOSE:To prevent a load from intolerably shaking in time of load lifting operation, by installing an interconnector valve, which is closed according to the selecting operation of a directional control valve (selector) for swing motion but opened by selection of a free swing in time of neutral-position returning operation, in position in parallel with a swing motor. CONSTITUTION:Interconnector valves 15 and 16 are interconnected through between main lines 13 and 14 via each of check valves 17 and 18, while each of stopper pressure receiving parts 23 and 24 carrying stoppers 21 and 22 is installed in each of these interconnector valves 15 and 16, and pilot lines 25 and 26 are connected to these stopper pressure receiving parts 23 and 24. On the other hand, manual type or solenoid-operated type on-off valves 29 and 30 are inserted into each of pilot lines 27 and 28 leading in the pressure of these main lines 13 and 14. With this method, when said on-off valves 29 and 30 are closed, swinging brake action can be performed and when these valves 29 and 30 are opened, interconnector valves 15 and 16 are opened as well whereby turning free swing can take place so that any possible load shaking in time of load lifting operation can be prevented.

Inventors

• 👤 Kimio Katsuki
• 👤 勝木　公雄
• 👤 Kazuhiko Otsubo
• 👤 大坪　和彦

Bibliographic Details