concavity adjustment system in a dual-harvester axial flow harvesting processor

摘要

the present invention relates to a combine harvester (10) which includes a frame (12) and two axial flow harvest processing rotors (21, 22) mounted on the frame. an internal support structure (32) is located between the two rotors, and is mounted on the frame by a first connection (34). two external support structures (42, 52) are located outside the edge of the two rotors (21, 22), and are mounted on the frame (12) by respective second and third connections (44, 54). the internal support structure and two external support structures carry first and second pluralities of concave grid segments (30, 31) at a radial distance (c) from the respective rotors. a concavity adjustment system includes a first actuator (81) coupled to the first connection (34) which is configured to raise and lower the internal support structure (32). a second actuator (82; 83) is coupled to one of the second and third connections (44; 54) and is configured to raise and lower at least one of said two external support structures (42; 52).