HYDRAULIC SYSTEM OF CONSTRUCTION MACHINERY

• Main Authors: KASUYA HIROTSUGU, TOYOOKA TSUKASA
• Format: Patent
• Language: English
• Published: 17.04.2001
• Edition: 7
• Subjects: BLASTING; CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BYMECHANICAL FEATURES ONLY; CONTROLLING; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; DREDGING; FIXED CONSTRUCTIONS; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; FOUNDATIONS; HEATING; HYDRAULIC ENGINEERING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MECHANICAL ENGINEERING; PHYSICS; REGULATING; SOIL SHIFTING; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; WEAPONS

PROBLEM TO BE SOLVED: To easily recognize where a connecting relation of an operation lever device and a directional change-over device is on a hydraulic system furnished with an operation type change-over valve. SOLUTION: An operation type change-over valve 2 to change a connecting relation of operation lever devices 11, 12 and directional change-over valves 31-34 and to change operation types of the operation lever devices 11, 12 is provided, a connecting relation of a pump port 2a, a tank port 2b and output ports 2c and 2d is provided on this operation type change-over valve 2, a different pressure signal transmitted at each of change-over positions is detected by pressure switches 51, 52, and it is input to a controller 4 as an electric signal. The controller 4 judges the change-over position of the operation type change- over valve 2 by combination of on and off of the electric signal and displays a judged result on a position display device 6 provided in a driver's cabin.