1991 Volume 53 Issue 5 Pages 31-40
There are two design objections of the subsoilers with pressurized fluid injection. They are for a pan-breaker and for an injector. A large soil failure rate favors the pan-breaker and a small soil failure rate favors the injector. This report deals with the appropriate shapes of the pan-breaker and the injector, the draft of which can be reduced by injecting pressurized air (about 1.2MPa at an air tank) from a nozzle port at the tip of a chisel, modifying the appropriate shapes of the subsoilers without fluid injection discribed in the previous report.
Our results showed that the appropriate pan-breaker with fluid injection should have the rake angle of 45-60°, the shank thickness of more than 15mm, the chisel length of 450mm, the chisel thickness of 50×50mm, and the heel position of 100mm. The appropriate injector with fluid injection should have the rake angle of 90°, the shank thickness of less than 15mm, the chisel length of 250mm, the chisel thickness of 30×30mm, and the heel position of 100mm.
