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 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.

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.

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.

An agricultural harvester includes a threshing system having a rotor, a rotor cage surrounding the rotor and including a concave, and a transition cone defining an infeed to the rotor cage. The transition cone has a conical inner surface extending in an axial direction between an upstream end and a downstream end of the cone. A vane is mounted to the conical inner surface of the transition cone. The vane protrudes radially from the conical inner surface, and extends along an axial direction between the upstream end and the downstream end. The vane has a body extending along an axis and a cross-sectional shape that is not constant along the axis.

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.

A combine harvester including one or two axial flow crop processors each with a rotor mounted for rotation inside a rotor housing that is arranged substantially longitudinally with respect to the harvester. A feed beater is mounted for rotation on a substantially transverse axis and serves to tangentially impel crop material into the crop processor(s). A drive system is provided for driving the rotor and the feed beater. A drive connection is provided between the rotor and the feed beater and includes a gear that is keyed to a rotor shaft of the rotor in front of a rotor drum.

A threshing concave assembly is disclosed having a threshing concave bar wherein the threshing bar is comprised of two threshing surfaces having a dihedral angle relationship relative to each other. In addition, in another aspect the threshing bar can be comprised of two dihedral surfaces whereby one surface face has about 130% greater surface area than its adjacent surface face. Alternatively, one surface face of the threshing bar can be 1.3× wider than its adjacent surface face. In another aspect the threshing bar can be comprised of two dihedral surfaces whereby one surface face has about a 170% greater surface area than its adjacent surface face.

A threshing concave assembly is disclosed having a threshing concave bar wherein the threshing bar is comprised of two threshing surfaces having a dihedral angle relationship relative to each other. In addition, in another aspect the threshing bar can be comprised of two dihedral surfaces whereby one surface face has about 130% greater surface area than its adjacent surface face. Alternatively, one surface face of the threshing bar can be 1.3× wider than its adjacent surface face. In another aspect the threshing bar can be comprised of two dihedral surfaces whereby one surface face has about a 170% greater surface area than its adjacent surface face.

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.