Title:
HYDRAULIC CONTROL DEVICE
Document Type and Number:
Japanese Patent JP2023082566
Kind Code:
A
Abstract:
To provide a hydraulic control device which can smoothly open a door body with minimum resistance when the door body is opened and can suppress flapping of the door body due to waves when the door body is closed by its own weight, and a hydraulic control device which can start and end a forced opening operation of a gate only by operating a hydraulic pump without operating a valve or the like.SOLUTION: A hydraulic control device of a gate comprises: a double-rod type hydraulic cylinder 3 having a rod 8 that moves in conjunction with movement of hydraulic oil, a front oil port 3a, and a rear oil port 3b; a door body 1 opening/closing in conjunction with the rod 8; a first communication pipe 10 having a check valve 11; a second communication pipe 12 having a float valve 4b and a flow control valve 13; a hydraulic pump 17 supplying hydraulic oil; a hydraulic oil supply pipe 14 connecting the hydraulic pump 17 to a front side of the check valve 11 and having a check valve 15a for supplying; and a hydraulic oil discharge pipe 16 connecting a hydraulic tank 18 to a rear side of the check valve 11 and having a check valve 15b with a discharge pilot.SELECTED DRAWING: Figure 6
Inventors:
FUJII MICHIHIRO
Application Number:
JP2021196425A
Publication Date:
June 14, 2023
Filing Date:
December 02, 2021
Export Citation:
Assignee:
KYOWA SEISAKUSHO KK
International Classes:
E02B7/20
Attorney, Agent or Firm:
Patent Attorney Corporation Eiwa Patent Office
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