The utilization of the reversible plow will be increased in furture. The reversible plows can be divided into the following types.
1. Moldboard plow.
(1) Bilateral symmetry reversible type.
(2) Bilateral symmetry roll-over type.
(3) Up-down symmetry roll-over type.
(4) Up-down symmetry turn-over type.
(5) Front-rear symmetry reversible type.
2. Disk plow.
(6) Up-down symmetry roll-over type.
(7) Disk supporting axis roll-over type.
Using these plows, the types of turning and the distance of futile run are as follows.
(1) Octopus type Σ
So″=(3-7/3)π
rB/b(2) Balloon type. Σ
Sb″=(7/3-1)π
rB/b(3) Poppet type. Σ
Sp″=(π
r+2
r+b)B/b(4) Medusa type. Σ
Sm″=(π
r+2
r-b)B/b(5) Cycloid type. ΣS
c″={π(2
r+b/2)+
b}B/2bB; the short side of field.
r; the minimum turning radius.
b; plowing width.
m; the number of dividing field (on short side)
Therefore, the distance of futile run is in the order as,
ΣS
c″<ΣS
m″<ΣS
p″<Σ<ΣS
b″<ΣS
o″
Next, the method and the distance that we treat the head-land are divided into two ways by the attachment which we use.
Using S-turn.
(1) Over-line turning method. Σ
Ho″=Σ
S″
(2) Additional plowing method. (A)
ΣH
a″=ΣS″+2l⋅B/b
(3) Additional plowing method. (B)
ΣH
b″=(S″+2l)⋅2l/b
(4) Combinative plowing method. Σ
Hc″=
B⋅2
l/bl; width of head-land.
L; length of tractor body.
Not using S-turn.
(1) Over-line turning method. Σ
Ho″=
L⋅
B/b(2) Additional plowing method. (A)Σ
Ha″=2
l⋅
B/bAt last, on the case of using reversible plow, the all distance of futile run is shown into the following formulas by combining the aforesaid turning method with the distance of futile run between treating head-land.
Using S-turn.
(1) Utilization of over-line turning method.Σ
S″
(2) Utilization of additional plowing method. (A)
ΣS″+2l⋅B/b
(3) Utilization of addtional plowing method. (B)
ΣS″+(S″+2l)⋅2l/b+A
(4) Utilization of combinative plowimg method.
ΣS″+B⋅2l/b+A
When S-turn is not used, the formulas are equal to the case of treating head-land. Therefore, when we use front-rear symmetry reversible type, the distance of futile run is minimum but we need the large field to use this type. Using the general S-turn, its order is as follows.
ΣH
0″<ΣH
a″<ΣS″+ΣH
c″<ΣS″+ΣH
b″
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