FRONT-END LOADER WITH ENERGY SAVING HYDRAULIC DRIVE OF LOADING EQUIPMENT Russian patent published in 2007 - IPC E02F9/22 

FIELD: construction and road building.

SUBSTANCE: invention relates to construction and road-building machinery, particularly, to single-bucket front-end with hydraulic-operated loading equipment. Proposed front-end loader with energy saving hydraulic drive of loading equipment contains base chassis with portal which carries loading equipment consisting of boom, rocker, tie-rod and bucket. Limit switch installed on boom has roller which is in constant contact with cam mounted on portal. Typical hydraulic drive of loading equipment includes boom and bucket cylinders, additional boom cylinder hinge connected with portal and boom, oil tank, pneumohydraulic accumulator, hydraulic distributor and other hydraulic mechanical connected by hydraulic lines into system providing control of all operations of machine working process. Hydraulic drive of loading equipment is furnished additionally with hydraulic pump, two-position and three-position electrohydraulic spools. In initial position and in position of lifting of loading equipment to height of unloading of loose material into vehicle, pressure hydraulic line of additional hydraulic pump is connected through channel of two-position electrohydraulic spool with drain hydraulic line and rod space of additional boom cylinder, and its piston space communicates through channel of three-position of electrohydraulic spool with liquid space of pneumohydraulic accumulator. In position of unloading of bucket into vehicle, pressure hydraulic line of additional hydraulic pump communicates through channels of two-position and three-position electrohydraulic spools with rod space of bucket cylinder, and piston space of said cylinder communicates through channel of three-position electrohydraulic spool with piston space of additional boom cylinder, and in lowering position of loading equipment, like spaces of additional boom and bucket cylinders communicate through channels of three-position electrohydraulic spool.

EFFECT: increased capacity owing to reduction of power consumption, reduced time of working cycle, facilitated conditions of operation for crane operator.

6 dwg