DRIVE CONTROL DEVICE FOR CONSTRUCTION EQUIPMENT AND CONTROL METHOD THEREFOR

摘要

Disclosed is a drive control device for the construction equipment capable of reducing shock generation and smoothly operating a work device when the work device is operated during the driving, which comprises; a first and second hydraulic pumps and a pilot pump, a first work device and a first drive motor operated by a hydraulic oil of the first hydraulic pump, a second work device and a second drive motor operated by a hydraulic oil of the second hydraulic pump, a first drive control valve and a first work device control valve that are provided on the supply path of the first hydraulic pump, a second drive control valve and a second work device control valve that are provided on the supply path of the second hydraulic pump, a linear drive control valve that is provided at the upper side of the supply path of the second hydraulic pump, a parallel path having an inlet branched and connected to the upper side of the supply path of the second hydraulic pump and an outlet connected to the inlet port of the second work device control valve, a branch path having an inlet branched and connected to a predetermined position of the parallel path and an outlet branched and connected to a path between the linear drive control valve and the second drive control valve, a fixed orifice provided on the branch path, and a first ratio control valve provided on a path between the pilot pump and the linear drive control valve.

主权项

1. A drive control device for the construction equipment comprising;
a first and second hydraulic pumps and a pilot pump, a first work device and a first drive motor operated by a hydraulic oil of the first hydraulic pump, a second work device and a second drive motor operated by a hydraulic oil of the second hydraulic pump, a first drive control valve and a first work device control valve that are provided on the supply path of the first hydraulic pump, and in switching, control the amount and flow direction of a hydraulic oil which is fed to the first drive motor and the first work equipment, respectively, a second drive control valve and a second work device control valve that are provided on the supply path of the second hydraulic pump, and in switching, control the amount and flow direction of a hydraulic oil which is fed to the second drive motor and the second work equipment, respectively, a linear drive control valve that is provided at the upper side of the supply path of the second hydraulic pump and maintains the drive linearity by switching when the multiple activities are done by operating a work device with the driving, a parallel path having an inlet branched and connected to the upper side of the supply path of the second hydraulic pump and an outlet connected to the inlet port of the second work device control valve, a branch path having an inlet branched and connected to a predetermined position of the parallel path and an outlet branched and connected to a path between the linear drive control valve and the second drive control valve, a fixed orifice provided on the branch path, the fixed orifice preventing the hydraulic oil from being weighted towards the drive side from the second hydraulic pump in case that the load pressure applied to a work device is higher than that applied to the driving when the linear drive control valve is switched for the multiple activities of operating a work device with the driving, and a first ratio control valve provided on a path between the pilot pump and the linear drive control valve, the first ratio control valve applying to the linear drive control valve the pilot pressures that are changed in proportion to the operating oil amounts required for the operation of the first and second work device levers when the multiple activities are performed by operating the work device with the driving.