The invention discloses a movable arm energy-saving
control system which comprises a first
oil tank, a variable pump, a motor, an overflow valve, a one-way valve, a three-position three-way electromagnetic
directional valve, a movable arm oil cylinder, a first
pressure sensor, a first hydraulic one-way valve, a two-position three-way electromagnetic
directional valve, a first two-position two-way electromagnetic
directional valve, a second
oil tank, a second two-position two-way electromagnetic directional valve, a second
pressure sensor, a constant displacement motor, a
variable displacement motor, an optical-
electricity encoder, a second
hydraulic control one-way valve, an
energy storage device, a third
oil tank, a third two-position two-way electromagnetic directional valve and a computer. The movable arm energy-saving
control system adopts a hydraulic
energy recovery mode that a
hydraulic transformer composed of the constant displacement motor and the
variable displacement motor is used as an energy converting component, and the hydraulic
energy storage device is used as an
energy storage component, has the advantages of being safe, low in cost, high in efficiency and the like, has great development potentiality in
engineering machinery, and especially has important development potentiality in saving energy of hydraulic excavators.