B3-CV-9-A related documentation Free space for pump pipes Bevel-helical speed reduction gearboxes B3

Flender/Flender Gear Units/Bevel-helical speed reduction gearboxes B3

pe threshing cylinders are provided with left and right rasps, or raised conguration alternately along its length and at regular intervals over the drum periphery to balance the side thrust-with numbers varying between six and ten (even number). The wrap angle of the stationary rasps of the concave grate is between 1 and 1 of the cylinder. Grain separation is obtained between the corrugated bars and concave grate.Sometimes, at-bar grate, in place of corrugated grates, is used as the concave. Rubbingand tearing actions are primarily responsible for grain detachment and breakage of straw.Apart from groundnut, rasp-bar cylinders are adopted for wide variety of crops and threshing conditions ( because the actions of rasps on crops are mild. It is recommended for pulse crop threshing in stationary threshers and cereal crop threshing at high moisturein straight-through combine harvester. 3.4.3 Flat-Bar CylindersThe construction of threshing cylinder, with or without corrugations in at-bars, is simi- lar to that of spike-tooth cylinder of stationary thresher, but is made more rigid and strong for threshing wheat crops. Besides the use of standard concave grating of steel rods and at-bars, as in other threshers, the louvers are placed on the inner surface of the coverfor axial-ow of crop materials, effective straw breakage, and grain separation. The graindetachment and straw breakage are primarily due to impact, and successive grain separa-tion is due to rubbing and tearing actions against the concave grate and louvers. 3.4.4 Angle-Iron-Bar Cylinders total of six to ten angle-iron bars in place of rasp-bars are mounted rigidly and regularly over the drum periphery to form the cylinder, and concave grating of steel rods andats is provided to separate grains from panicles, primarily by impact. Subsequent grain detachment during its ow through restricted passage occurs by rubbing and tearingactions in axial-ow threshers. This type of threshing cylinder is easily ad