Cleaning chamber and method for a sugarcane chopper harvester
A sugarcane chopper harvester is equipped with a cleaning chamber for cleaning extraneous leafy matter and dirt from harvested and chopped cane delivered to the chamber. Located within the chamber is an axial flow fan for effecting an upward flow of air including a high-velocity, outer, ring-shaped upwardly flowing air stream. Mounted to the bottom of the axial flow fan is a blower wheel for creating an upwardly and outwardly flowing air stream beneath the center of the axial flow fan such that leafy matter and dirt passing into the middle of the cleaning chamber below the axial flow fan is caused to be directed outwardly to the high-velocity, ring-shaped stream of air.
1. A sugarcane chopper harvester, comprising: a conveyor arrangement for delivering a mixture of cane billets, extraneous leaves and dirt to a cleaning zone; a cleaning chamber including a major cylindrical bottom wall section at least partially surrounding said cleaning zone; a generally cylindrical fan housing joined to a top of said wall section, and said bottom wall section and said fan housing having a central upright axis; said fan housing having an axial flow fan mounted therein for rotation about said central axis of said housing; said fan having a plurality of blades fixed to, and radiating out from, a central hub; a centrifugal blower wheel mounted beneath and fixed to said fan for creating air flow in the center of the cleaning chamber in a zone beneath said hub; and a drive motor being coupled for effecting rotation of said fan and blower wheel.
2. The sugarcane chopper harvester, as defined in claim 1 , wherein said cylindrical fan housing extends to a level below said fan; and a plurality of air deflecting vanes being fixed to an interior circumference of said fan housing at a location below said fan and radially outward of said blower wheel.
3. The sugarcane chopper harvester, as defined in claim 1 , and further including an arched support structure having a cylindrical recess located centrally above said fan housing; a cylindrical tubular motor housing having an upper end located in said recess and fixed to said arched support structure; and said drive motor being mounted within said tubular motor housing.
4. The sugarcane chopper harvester, as defined in claim 3 , wherein said cleaning chamber includes a domed hood positioned beneath said arched support.
5. A method of cleaning extraneous leafy matter and dirt from a stream of harvested and chopped cane stalks that are delivered to a cleaning chamber, comprising the steps of:
a. creating a first air stream within said cleaning chamber which flows upwardly at a high velocity and is ring-shaped;
b. simultaneously creating a second air stream, within said ring-shaped first air stream, which flows upwardly and then horizontally outwardly toward said first air stream; and
c. delivering said stream of harvested and chopped cane stalks to said cleaning chamber at a location traversing said first air stream at a location below the horizontally flowing portion of said second air stream.