A threshing concave has two curved end plates spaced from one another and a set of concave bars extending between the end plates. An elongate gap is presented between each adjacent pair of the concave bars, through which gaps threshed grain can pass during operation. Concave rods extend in the same direction as the end plates and through holes provided in the concave bars. One or more blanking plates are releasably bolted to the end plates and extend along respective elongate gaps.

A combine harvester is provided with left and right main frames that extend in the front-rear direction of a vehicle body, and a threshing device installed between the left and right main frames. The threshing device is provided with a threshing unit that performs a grain removal process, and a sorting unit that is provided below the threshing unit and performs a sorting process of sorting processed articles after the grain removal process has been performed by the threshing unit. A threshing frame included in the threshing unit is mounted on and supported by the left and right main frames, and a sorting unit frame included in the sorting unit is suspended from and supported by the left and right main frames.

A concave assembly for an agricultural machine includes a frame pivotally connected to a structural component and a concave connected to the frame. The frame includes a trunnion having a front end and a rear end. A front arm and a rear arm are connected to the trunnion. A crossbar extends between the front arm and the rear arm. A rotating member rotatably connected to the crossbar. The concave includes a first outer support and a second outer support. An inner support is positioned between the first outer support and the second outer support. A plurality of separator bars extend between the first outer support and the second outer support.

Compound headers may include two or more crop harvester types that are operable to harvest different crops simultaneously, such as different crops grown in the same field in an intercropped relationship. The simultaneously harvested crops may be separated into individual crop flows that are handled separately from each other.

The threshing apparatus 6 includes a threshing chamber 11 into which the crops are introduced, a threshing drum 12 that is provided in the threshing chamber 11 so as to rotate with the threshing drum axial center in the front-rear direction of the threshing chamber 11 serving as the rotation center, and which threshes the crops introduced into the threshing chamber 11, and a receiving net 13 provided in the outer periphery of the lower part of the threshing drum 12. The receiving net 13 is divided into a plurality of divided receiving net bodies 13A in the front-rear direction, the plurality of divided receiving net bodies 13A are operated to adjust, for each of the plurality of divided receiving net bodies, the interval S in the radial direction of the threshing drum 12 between the divided receiving net body 13A and the threshing drum 12.

A combine harvester is provided with: a threshing device that performs a threshing process of threshing a crop; a grain tank that stores grain obtained by the threshing process; a grain discharging device that discharges grain to be stored in the grain tank to the outside of the vehicle body; a travel driving device that drives travel of the vehicle body; and an engine that serves as a power source. The combine harvester includes a first relay shaft to which power is transmitted from an output shaft of the engine, and the power of the engine is transmitted from the first relay shaft to the grain discharging device and the travel driving device in a branched manner.

A combine harvester is provided with: a threshing device that performs a threshing process of threshing a crop; a grain tank that stores grain obtained by the threshing process; a grain discharging device that discharges grain to be stored in the grain tank to the outside of the vehicle body; a travel driving device that drives travel of the vehicle body; and an engine that serves as a power source. The combine harvester includes a first relay shaft to which power is transmitted from an output shaft of the engine, and the power of the engine is transmitted from the first relay shaft to the grain discharging device and the travel driving device in a branched manner.

Systems and methods for automatically establishing a gap between a concave and a rotor of a rotary crop processing system are disclosed. Establishing the gap may include displacing the concave towards the rotor until contact is detected therebetween. Contact may be detected using a sensor configured to detect contact between the rotor and the concave. The sensor may be a knock sensor. The concave is displaced away from the rotor when contact is detected until contact between the rotor and the concave is no longer detected. One or more actuators may be coupled to the concave to move the concave relative to the rotor. In some implementations, the actuators may be operated in sequence to form the gap between the rotor and the concave.

An embodiment includes a combine having a grain sample sensor for detecting frequencies of impacts of separated grain on the grain sample sensor, a grain loss sensor for detecting frequencies of impacts of residue and lost grain on the grain loss sensor, and a controller. The controller is configured to receive, from the grain sample sensor, the frequencies of the impacts of the separated grain, receive, from the grain loss sensor, the frequencies of the impacts of the residue and the lost grain, set a detection frequency band based on the frequencies of the impacts of the separated grain, filter the frequencies of the impacts of the residue and the lost grain based on the detection frequency band, determine, from the filtered frequencies, grain loss information, and indicate the grain loss information to an operator of the combine, or control the combine based on the grain loss information.

An embodiment includes a combine having a feeder housing for receiving harvested crop, a separating system for threshing the harvested crop to separate grain from residue, a residue spreader wheel spinning for expelling the residue from the combine, and a controller that controls the combine. The controller is configured to control the residue spreader wheel to continuously oscillate between a first speed less than a nominal speed and a second speed greater than the nominal speed while spreading the residue.