This invention discloses a double longitudinal axial flow drum with adjustable
threshing section gap, including a
threshing section gap adjustment mechanism, a concave
sieve, a cover plate, a double longitudinal axial flow drum, and a frame. The
threshing section gap adjustment mechanism includes a rotating fixed rod, a
bevel gear system, a rotating main shaft bearing seat, a rotating fixed block, a bearing
assembly, a
cam storage box, a
cam, a motor transmission gear, a rotating main shaft, and a
cam top cover. The double longitudinal axial flow drum with adjustable threshing section gap uses a
servo motor to drive the cam to perform circumferential motion, which is converted into the up-and-down motion of the grid-type concave plate. This changes the gap between the grid-type concave plate and the flexible short-grooved variable-
diameter threshing drum, realizing accurate adjustment of the local threshing gap of the double longitudinal axial flow drum. It adapts to real-
time changes in crops with different
moisture contents, feed rates, and drum speeds, reducing the grain
breakage rate.