An engineering mechanical hydraulic control system and its sub-confluence

The present invention discloses a sub-confluent hydraulic control system for a construction machine, comprising: a first oil supply passage and the second oil path, both through the sub-mixing valve (4) communicating or disconnected; first load feedback oil Road and second feedback load circuit, respectively, both the shuttle valve (2) a first inlet port, a second inlet port is connected; the shuttle valve (2) of the port through the second flow compensated valve ( 6) communicating with said second oil supply passage; further comprising a pressure isolation valve (1), the first load feedback oil passage shut-off valve (1) and said shuttle valve (2) through said first feed pressure communication port or disconnected. This sub-confluence hydraulic control system, to avoid the impact first start the first work-linked work-linked second restart, the first impact of the work associated second work linked to and caused by vibration. The present invention also discloses a construction machinery, including the portion of the car; the car part of the sub-confluence hydraulic control system, which also has a corresponding mechanical engineering technical effects.