Studies on harvesting machines (VII)
Measurement of cutting resistance for crop stems by knife section of cutter-bar (2)
1954 Volume 16 Issue 1-2 Pages 6-8
Details
1954 Volume 16 Issue 1-2 Pages 6-8
In order to measure the cutting force of crop stems, we manufactured a E. I.-I type testing machine which was similar the impact hardness tester. The pendulum arm of the machine has one knife at the lower end, and the length of arm is constant, but the knife velocity is variable freely by changing the weight of load and the original angle. By a auto-recorder, we could know the cutting velocity and force. In these serries of tests we have carried out, the knife velocity was within 2.34-3.3m/s, and the inclined angle of knife within 30, 40°, and the wedge angle of knife on 22.5°.
Result as follow:
crop stems cutting force (g) specific cutting force (kg/cm2)
milk vetch 80 1.3
rice 180 2.0
wheat 210 1.7
barley 230 1.6
sweet potato 340 1.2
rape 2, 000 6.0
soyabean 5, 000 11.3
corn 5, 900 2.5
