A cleaning system for a combine harvester includes a fan, at least one duct having an interior passageway that is positioned to receive an air stream from the fan, and a surface defined within the interior passageway of the at least one duct that is configured to restrict a volume of the flow of air passing through the at least one duct and increase a pressure of the air stream passing through the duct.

A combine harvester includes a header assembly configured for collecting a crop, a threshing assembly coupled to the header assembly and configured for separating grains of the crop from material other than grain, and a cleaning assembly positioned in association with the threshing assembly and configured for separating the grains from chaff. The cleaning assembly includes a fan assembly having a fan housing with a fan output duct and a fan mounted to the fan housing, and one or more cleaning sieves. The fan assembly is configured to blow air across the one or more cleaning sieves via the fan output duct. The fan output duct includes at least one segmented air deflector.

The present invention provides a three-degree-of-freedom hybrid vibratory screening mechanism, a control method thereof, and a harvester. The three-degree-of-freedom hybrid vibratory screening mechanism comprises a frame, a vibrating screen, a first driving mechanism, a second driving mechanism, sensors and a controller; parallel drive of hydraulic motors are used for achieving two-degree-of-freedom rotational adjustment of the horizontal attitude angle and inclination angle of the screen surface of the vibrating screen, and the first driving mechanism drives the vibrating screen to reciprocate in one degree of freedom, so as to realize three-degree-of-freedom vibration adjustment of the screen surface; a vibration parameter control model is established by means of theoretical analysis in combination with experiment. In the operating process, the sensors installed at the tail part of the vibrating screen monitor the loss rate and distribution of the grains in real time, and the horizontal attitude angle of the screen surface, inclination angle of the screen surface and vibration frequency are self-adaptively optimized and adjusted to promote uniform and discrete distribution of the material on the screen surface, so that the screening efficiency of the material under a condition of non-uniform material feeding is effectively improved and the loss rate of the grains is decreased.

A grain cleaning system for a combine harvester having a transmitter adapted to transmit a base signal at a known frequency and one or more spaced receivers for detecting signals of a different frequency as reflected from airborne grain and other materials within the duct of the grain cleaning system An Electronic Control Unit modulates the base signal and the reflected signals to obtain Doppler signals or frequencies from which an average particle velocity is determined. The particle velocity is used as an input parameter for the generation of control signals for the adjustment of various working units of the combine harvester including, by way of example, the fan and sieves.

A grain cleaning system for a combine harvester having a transmitter adapted to transmit a base signal at a known frequency and one or more spaced receivers for detecting signals of a different frequency as reflected from airborne grain and other materials within the duct of the grain cleaning system An Electronic Control Unit modulates the base signal and the reflected signals to obtain Doppler signals or frequencies from which an average particle velocity is determined. The particle velocity is used as an input parameter for the generation of control signals for the adjustment of various working units of the combine harvester including, by way of example, the fan and sieves.

A cleaning mechanism of a combine harvester, for cleaning threshed and separated crop material, including a grain pan for receiving threshed and separated crop material and transporting the crop material rearwardly; a chaffer installed proximate the grain pan for receiving material from the grain pan where the chaffer includes a plurality of longitudinal channels with non-planar surfaces giving each channel a curved or trapezoidal cross section and at least two of the chaffer channels have an asymmetric non-planar surface with a greater part of the surface area facing the side portions of the chaffer; and a fan that causes an air flow through the chaffer to lift up discardable parts from the crop material and transport the discardable parts out of the combine harvester.

A separator module for an agricultural machine. The separator module includes a feederhouse configured to receive crop from a harvesting platform, a casing enclosing a rotor positioned therein and rotatable relative to the casing for processing crop from the feederhouse, a cover extending between the feederhouse and the casing, and a noise control treatment coupled to the cover.

A separator module for an agricultural machine. The separator module includes a feederhouse configured to receive crop from a harvesting platform, a casing enclosing a rotor positioned therein and rotatable relative to the casing for processing crop from the feederhouse, a cover extending between the feederhouse and the casing, and a noise control treatment coupled to the cover.

A fan assembly for a cleaning system of a combine harvester includes a housing having a plurality of interconnected walls, the interconnected walls defining least one inlet opening through which air is delivered into the housing, and at least one outlet opening through which air is exhausted from the housing. A deflector is positioned either at or adjacent the outlet opening, the deflector being configured to affect a flow of air across a width dimension W of the outlet opening. The deflector may be a single, unitary body or the deflector may include a plurality of independently rotatably panels.

A harvesting machine including a cutting head configured to provide cut crop for threshing. The harvesting machine includes a conveyer disposed adjacent to the cutting head and configured to move the cut crop to be threshed along a path. A thresher is configured to thresh the cut crop to provide threshed grain from the cut crop. A separator is disposed adjacently to the thresher and is configured to separate debris from the threshed grain. A feed accelerator is disposed between the conveyor and the thresher, wherein the feed accelerator is configured to advance the cut crop along the path from the conveyor to the thresher. A pre-threshing device is disposed adjacently to the feed accelerator, wherein the feed accelerator interacts with the pre-threshing device to provide threshed grain, and the pre-threshing device is configured to collect the threshed grain before the remaining cut crop is threshed at the thresher.