H3FH-14-C flender himmel getriebemotoren Helical gear unit H3

Flender/Flender Gear Units/Helical gear unit H3

er Unit of Combine Harvester The header unit refers to the cutting and conveying mechanism of combine harvester; therefore, it includes the reel, the cutter-bar, an inclined canvas conveyor or platformfor receiving the cut crops, and feeding them into the cylinderconcave assembly wherethreshing and separation take place. The entire header unit of combine is normally hingedat the front to enable adjustment of the stubble height between 4 and 6 cm during harvest- ing and up to 1 during transport or moving from one plot to another. The conventional reel in self-propelled or trailed combines is either ground-driven or power-driven with interchangeable sprockets to vary its peripheral velocity. It is pro-vided with four to eight slats (bats) xed rigidly on radial arms. For effective laying ofcut crops on the conveyor and to meet the different crop requirements, the reel positionis made adjustable both horizontally and vertically. This is because the reel position rela- tive to the cutter-bar level, and its speed in reference to the forward velocity, affect header loss (shatter and cutter-bar losses) beside the crop condition and cutting height. For opti-mum combine operation, the reel axis is kept to level such that the bottom edges of theslats at the lowest point of their travel are either in the same level or little lower thanthe cutter-bar level, and this is adjusted slightly ahead of the cutter-bar. During operation,the peripheral speed of the reel is adjusted between 2 and 4% in excess of the forwardspeed of the combine to meet the crop maturity level and to evenly spread the cut crops on the conveyor, with heads pointing inward. In other words, the reel index, the ratio of the peripheral velocity of reel tip to the forward velocity of the combine, should be between1.2 and 1.4. Lower reel speeds will result in uneven laying of crops on the conveyorand less shattering losses, and vice versa. In windrowcombine system, the design and construction of the pickup