초록 ▼

An elevator valve apparatus for controlling the hydraulic supply flow to the hydraulic actuator and the hydraulic discharge flow from the actuator, comprises a solenoid proportional control valve device for ascending, a solenoid proportional control valve device for descending, and a valve control u

An elevator valve apparatus for controlling the hydraulic supply flow to the hydraulic actuator and the hydraulic discharge flow from the actuator, comprises a solenoid proportional control valve device for ascending, a solenoid proportional control valve device for descending, and a valve control unit for controlling both of the control valve devices with a predetermined acceleration characteristic and a predetermined deceleration characteristic by an open loop control system. Furthermore, if preferable, the valve control unit carries out oil temperature compensating control, pressure compensating control, pre-start pressure raising compensation control, and feedback control of the supply flow in the low speed ascending.

대표청구항 ▼

An elevator valve apparatus installed in a hydraulic circuit which communicates a hydraulic actuator for driving an elevator cage to ascend and descend and a fixed discharge hydraulic pump for supplying hydraulic oil to the hydraulic actuator, said elevator valve apparatus being characterized by com

An elevator valve apparatus installed in a hydraulic circuit which communicates a hydraulic actuator for driving an elevator cage to ascend and descend and a fixed discharge hydraulic pump for supplying hydraulic oil to the hydraulic actuator, said elevator valve apparatus being characterized by comprising: a main oil passage for communicating a pump port and an actuator port; a solenoid proportional control valve means for ascending of normally open type for controlling bleed-off flow bleeded off from the hydraulic oil supplied to the main oil passage from the hydraulic pump; a solenoid proportional control valve means for descending for controlling discharge flow discharged from the hydraulic actuator; a check valve, which is disposed in the main oil passage for preventing the hydraulic oil from flowing from the hydraulic actuator to the solenoid proportional control valve means for ascending, of which valve body movement stroke vs. flow characteristic is linear in a range not more than a predetermined flow; a stroke sensor for detecting the moving stroke of the valve body of the check valve; a valve control means for controlling both of the solenoid proportional control valve means for ascending and for descending with a predetermined acceleration characteristic and a deceleration characteristic, based on command signals supplied from outside for commanding at least start, ascent or descent, start of deceleration, and stop; and a feedback compensation control means for compensating a control signal controlling the solenoid proportional control valve means for ascending when the cage ascends at a low speed after deceleration so that actual hydraulic flow to the hydraulic actuator becomes equal to predetermined hydraulic flow for low speed ascending, based on an output from the stroke sensor.