Anti-blocking hydraulic control system of conveying channel of sugarcane harvester

The invention discloses an anti-blocking hydraulic control system of a conveying channel of a sugarcane harvester. The system comprises a two-position four-way hydraulic reversing valve and a pressureswitch valve, wherein a first valve element, a first spring and a third spring are arranged in the two-position four-way hydraulic reversing valve, the two-position four-way hydraulic reversing valveis provided with a port A, a port P, a port B, a port T and a port g, the port P is connected with a pressure source, the port T is connected with an oil tank, a second valve element is arranged in the pressure switch valve, a second spring is arranged on one side of the pressure switch valve, the other side of the pressure switch valve is provided with a port e and a port f communicating with the port g, opening and closing of the port f are controlled by the second valve element, the port e of the pressure switch valve is connected with one port of a two-way quantitative hydraulic motor inparallel and then is connec