Subdual of stationary thresher machine for chopping resudies

Categories of Cutting length ,cm .

T

h

e

 c

u

tt

in

g

 le

n

g

th

 p

e

rc

e

n

ta

g

e

,%

. 

drum speed=13.1 m/s

drum speed=15.71 m/s

drum speed=18.33 m/s

The reason may be due to rice straw has strong fiber contains silicon can 

not be cut easily and elongated before cutting. While the cotton stalks cut 

was the shorter than crop. residues because the cotton stalks has a solid 

cross-section and that wanes the chopping easier. on the other hand the 

difference in cut length for different crop residues was due to the 

difference in physical and mechanical properties of plant stalks 

2-feed rate . 

Fig.(3): the relation between the cutting length percentage % and 

categories of cutting length at different feeding rate for different crop 

residues. 

The obtained results indicated that increasing feed rate from 0.5 ton/h to 

1.5 ton/h, decreased the percentage of cut length of <3.5 cm (first 

category) from 78.5 to 70.2 % of rice straw, from 80.2 to 75.2 % of corn 

stalks and from 70.4 to 66.7 %of cotton stalks respectively. While the 

second and third categories (3.5 -10 cm and <10 cm)  was increased from 

16.2 to 20.7 % and 5.3 to 9.1%of rice straw, from 15.3 to 18.3 and 4.5 to 

6.5% of corn stalks and from 19.0 to 21.1 % and 10.6 to 12.2 % of cotton 

stalks respectively at 4 cm

2 

oval slots  

concave, 18.3m/s drum speed,14.3 % moisture content and 3 cm drum-

concave clearance.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig.(3): the relation between the cutting length percentage % and categories of 

cutting length at different feeding rate for different crop residues. 

---

 Misr J. Ag. Eng., July  2007 

  

                            

                                                        

 

 

514 

0

10

20

30

40

50

60

70

80

90

< 3.5 cm

3.5-10

cm

> 10 cm < 3.5 cm

3.5-10

cm

> 10 cm < 3.5 cm

3.5-10

cm

> 10 cm

Rice straw

Corn stalks

cotton stalks