Almaco SPC 20, Operator'S Manual, Page: 31 / 76

SPC 20 OPERATOR’S MANUAL
OPERATION C-3
COMBINE FUNCTION DESCRIPTION
The threshing operation is accomplished by a hydraulically driven, 15-1/4” diameter, variable speed
rasp bar cylinder and one adjustable, underslung, grated style concave. A strawpuller positioned
directly behind the threshing cylinder prevents cylinder wrapping and assists the movement of plant
material through the machine. An adjustable / removable curtains is also utilized to prevent seed
rebounding and to control threshed material flow.
Cleaning is achieved in two stages:
1. Threshed material falls upon the first mechanically driven sieve where seed and smaller material
fall through the sieve on to an upper internal conveyor. The conveyor carries separated material on
to a finer mesh lower sieve. The second sieve traps smaller material and allows the seed to fall
through onto a lower internal conveyor. This conveyor drops the seed into the winnowing blower air
stream.
2. The large winnowing blower located at the lower portion of the machine; directs an adjustable air
stream across the discharge area of the lower sieve and conveyor. In this secondary cleaning
stage, the remaining debris in the seed sample is discharged out the rear of the machine.
Seed falls through the winnowing blower air stream and falls into the venturi tube and cyclone air
stream. The cyclone blower air stream lifts seed through the venturi tubes to the cyclone seed
hopper. Several different options direct the seed to a number of different locations.
PINCH BELT
FEED BELT
CONCAVE
INTERNAL CONVEYOR
SHAKER PAN
SIEVE
STRAW PULLER
THRESHING
CYLINDER
FIGURE C-1 Threshing Function Diagram