| 摘要 |
Machine for killing insects in a stream of grain or finely divided food, the grain flowing down into the machine onto a distributor for even spreading over a plurality of angle deflectors, and by them directed downwardly and forwardly onto a plurality of angularly disposed grids. In flowing over the electrified grids, insects are electrocuted. From the grids the material flows into a hopper and back into the stream. Anti-explosive atmosphere is maintained in the machine by a sequencing control, to feed in non-combustible gas in regulated quantities to maintain the oxygen content within 5-10 percent, preventing starting and electrification of the machine until a test arrangement finds the oxygen content reduced below 10 percent, and thereafter feeding CO2 at rates to continue reduction to 5 percent, and then maintain it between 5 and 10 percent oxygen.
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