buletinul institutului politehnic din iaşi - Universitatea Tehnică ...

Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 275
From experimental data presented in Table 1 can be seen that the shear
force has the highest values in the case of strains of wheat, and here vindrover
knives
are cut with the smallest force, the vertical strains and strains inclined.
As expected, the shear force values register lower in all cultures whose
stem is inclined, in this case cutting is more advantageous energetically.
Cutting force size changes significantly when cutting is performed on a
node of
the stem. The biggest differences are the cut stems of wheat is 2.5 times
higher in type FENDT knife blades, knife type blades 2.7 times at SEMA and 6
times higher in type vindrover knife blades.
Table 2
Variation of cutting force and displacement of the cutting blade plant strains
Vindrover SEMA
FENDT
force (N) displacement force (N) displacement force (N) displacement
(mm) (mm) (mm)
vertical strain-cutting between nodes
wheat 14,95-22,09 10,1-11,2 27,16-27,36 10,1-11,1 28,18-31,24
17,1-18,7
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
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
inclined stra in-cutting between nodes
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
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
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
vertical strain-cutting p er node
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
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
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
The
cutting force cutting strains of barley is a smaller increase, from 1.66
times at
vindrover and 2.31 ti mes at SEMA, while the oats betwee n 2.02
times
at FENDT and 3.57 times at SEMA.
4. Conclusions
1. The stand realized allows the
determination with sufficient accuracy
cutting force and displacement stems vegetable knife
while cutting the node or
between nodes.
2. The construction is equipped with load and displacement with high
sensitivity and presentation software makes chart as measured values.
3. The stand
can be used to measure cutting force for any crop at all
stages of vegetation and any constructive variant of type knife-finger cutting
apparatus.
REFERENCES
Filipescu I. , Contribuţii
la tăierea mecanizată a viţei de vie în uscat. Teză de
doctorat, Universitatea Tehnică ,,Gheorghe Asachi” Iaşi, 1998.