| 摘要 |
PROBLEM TO BE SOLVED: To make actuators of a travel system and an working machine system operate stably and concurrently. SOLUTION: This load sensing control device of construction machinery includes: a work state detecting mechanism which outputs a pilot signal by detecting whether or not working machine control valves V2, V3, V5 and V6 of either of first and second circuit systems and motor control valves V1 and V4 of the first and second circuit systems are concurrently switched to positions except a neutral one; and an integrated control valve 25 which brings about the communicating or blocked state of and pilot paths 5 and 14 and neutral channels 2 and 11 provided in the first and second circuit systems, respectively. The integrated control valve maintains a blocking position in a normal state. On the other hand, when a signal, which provides notification that the working machine control valves V2, V3, V5 and V6 of either of the first and second circuit systems and both the motor control valves V1 and V4 of the first and second circuit systems are concurrently switched to the positions except the neutral position, is output from the work state detecting mechanism, the integrated control valve 25 is switched to a communicating position. COPYRIGHT: (C)2011,JPO&INPIT |
