| 摘要 |
A hydraulic circuit for heavy equipment is provided to easily operate a simultaneous and combined motion by slowing the rotation speed and speeding up an operation apparatus. A hydraulic circuit for heavy equipment comprises an operation control valve(13) for controlling an operation apparatus cylinder(2) by supplying and withdrawing hydraulic oil of a first hydraulic pump through operator passages(14,15); a confluent valve(23) mounted on parallel passages(12,22) connected with a second hydraulic valve(21) joining the hydraulic oil and the operator passage according as the position is changed; a rotation control valve(30) sitting on the parallel passage, and controlling hydraulic rotation motors(31,32) by supplying and withdrawing the hydraulic oil of the second hydraulic pump with plural hydraulic rotation motors driving a rotation device; and a shutting valve(40) sitting on rotation passages(35,36) connecting the rotation control valve and the rotation motor, and shutting the hydraulic oil supplied at least one of the rotation motors by changing the position together with the confluent valve at the same time, communicating an inflow hole(37) and an outflow hole(38) of the shut rotation motor.
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