To provide a hydraulic control circuit of derricking type automatic gate equipment, which does not allow large change of a hydraulic oil circulation circuit length, is hardly affected by a height difference of an installation position or air temperature, and keeps an automatic operation control function even when a hydraulic line is cut off or when outflow of an operation controller occurs.
In the hydraulic control circuit of the derricking type automatic gate equipment, a hydraulic oil circulation circuit length is not largely changed regardless of an arrangement position of an operation controller and the influence of the height difference of an installation position and air temperature are hardly exerted by installing only a hydraulic circuit 9b which performs automatic operation control near a hydraulic cylinder 5 as a hydraulic unit separated from and made independent of the entire hydraulic control circuit, and an automatic operation control function is kept even when a hydraulic line 9c is cut off or when outflow of the operation controller occurs since the hydraulic circuit communicating the hydraulic circuit 9b which performs the automatic operation control and the hydraulic unit inside the operation controller is shut off on the side of the hydraulic circuit 9b for the automatic operation control.
JPS5555711A | 1980-04-23 | |||
JP2006257831A | 2006-09-28 | |||
JPS6427506U | 1989-02-16 | |||
JPS5555711A | 1980-04-23 |
Takato Tsutsumi
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