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Abstract: In order to reduce the centrifugal force affecting the big
arm and decrease outer axis attitude error, the unloading system of the
precision centrifuge is designed. This system comprises one loading
vehicle instrument, “birdcage”, four draw bars, the upper indexing
table, the lower indexing table and eight force sensors. According to
the messages from the eight force sensors, unloading balance block is
moved to realize unloading balance and to keep the engagement force of
indexing table as a constant. The vehicle instrument moved automatically
along the direction of centrifugal force when the centrifuge speeded up.
The centrifugal forces of the vehicle instrument and the “birdcage” are
same, and they only affect the draw bars instead of the big arm. So
auto-unloading of the big arm is realized. By using computer, the data
processing, acquisition and controlling the mechanism of unloading
balance system, and the high precision on-line auto-unloading is
realized.
Key words: Precision centrifuge On-line auto-unloading Indexing table
engagement Force sensor Computer control
CLC No: TH113.25
“九五”国防重点预研项目(9.5.1/A966000-15). Received 20020114, received in revised
form 20030122
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