buletinul institutului politehnic din iaşi - Universitatea Tehnică ...
buletinul institutului politehnic din iaşi - Universitatea Tehnică ...
buletinul institutului politehnic din iaşi - Universitatea Tehnică ...
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Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 275<br />
From experimental data presented in Table 1 can be seen that the shear<br />
force has the highest values in the case of strains of wheat, and here vindrover<br />
knives<br />
are cut with the smallest force, the vertical strains and strains inclined.<br />
As expected, the shear force values register lower in all cultures whose<br />
stem is inclined, in this case cutting is more advantageous energetically.<br />
Cutting force size changes significantly when cutting is performed on a<br />
node of<br />
the stem. The biggest differences are the cut stems of wheat is 2.5 times<br />
higher in type FENDT knife blades, knife type blades 2.7 times at SEMA and 6<br />
times higher in type vindrover knife blades.<br />
Table 2<br />
Variation of cutting force and displacement of the cutting blade plant strains<br />
Vindrover SEMA<br />
FENDT<br />
force (N) displacement force (N) displacement force (N) displacement<br />
(mm) (mm) (mm)<br />
vertical strain-cutting between nodes<br />
wheat 14,95-22,09 10,1-11,2 27,16-27,36 10,1-11,1 28,18-31,24<br />
17,1-18,7<br />
barley 9,85-12,1 9 ,1-10,5 1 4,95-19,03 16,2-17, 6 1 4,95-15,97 14 ,8-16,3<br />
oats 11,89-13,93 9,4-10,7 15,97-19,03 7,7-8,9 10,81-12,91 19, 2-20,2<br />
inclined stra in-cutting between nodes<br />
wheat 1 3,93-22,09 10,1-11,2 25,16-29,2 11,8-13,2 27,45-32,21 15,1-16,7<br />
barley 9,25-11,89 12,8-13,8 11,89-16,98 1 1,4-13,1 14,73-16,57 15,4-16,9<br />
oats 7,81-11,89 14,9-16,5 13,25-17,02 8,9-10,1 7,77-9,79 17,6-19,2<br />
vertical strain-cutting p er node<br />
wheat 117,8-132,1 8,2-10,1 62,84-73,1 12,2-13,3 62,84-76,9 19,2-21,1<br />
barley 15,79-20,05 8,9-10,1 32,28-44,48 10,0-11,3 2 2,09-27,16 14,8-16,3<br />
oats 26,14-34,3 6,7-7,8 57,74-68,5 7,9-9,3 25, 12-26,14 19,1-20,2<br />
The<br />
cutting force cutting strains of barley is a smaller increase, from 1.66<br />
times at<br />
vindrover and 2.31 ti mes at SEMA, while the oats betwee n 2.02<br />
times<br />
at FENDT and 3.57 times at SEMA.<br />
4. Conclusions<br />
1. The stand realized allows the<br />
determination with sufficient accuracy<br />
cutting force and displacement stems vegetable knife<br />
while cutting the node or<br />
between nodes.<br />
2. The construction is equipped with load and displacement with high<br />
sensitivity and presentation software makes chart as measured values.<br />
3. The stand<br />
can be used to measure cutting force for any crop at all<br />
stages of vegetation and any constructive variant of type knife-finger cutting<br />
apparatus.<br />
REFERENCES<br />
Filipescu I. , Contribuţii<br />
la tăierea mecanizată a viţei de vie în uscat. Teză de<br />
doctorat, <strong>Universitatea</strong> <strong>Tehnică</strong> ,,Gheorghe Asachi” Iaşi, 1998.