ISO 8909-1:2021 収穫のための機器 — 飼料収穫機 — Part 1: 語彙 | ページ 8

5.14.1

row crop and maize header width

row crop and ear corn header width

average width between the centrelines of adjacent row units multiplied by the number of row units

Note 1 to entry: Expressed in metres to the nearest hundredth.

Note 2 to entry: For a single row head, the harvesting width equals the row central line spacing.

5.14.2

pickup header width

width between the outermost crop lifting tine rows plus one tine row spacing

Note 1 to entry: Expressed in metres to the nearest hundredth.

Note 2 to entry: Where gathering wheels precede the pickup mechanism, actual harvesting width is equal to the horizontal distance between the wheel centres.

5.14.3

direct‐cut header width

minimum width between the side sheets of the harvesting unit measured directly above the forward tips of the cutterbar (sickle, knife) sections

Note 1 to entry: Expressed in metres to the nearest hundredth.

Note 2 to entry: For rotary impact cutters, the cutting width is equal to the width between the extreme left-hand and right hand cutting unit's outermost points on the knife tip cutting circles.

Note 3 to entry: For unidirectional cutterbars, it is the distance between the belt-pulleys or chain sprockets centrelines.

5.15.1

cutterbar height

height measured at the forward tip of the cutting element above the plane on which the machine stands

Note 1 to entry: This also applies to oscillating scissor knife width, rotary impact disc or drum cutter width, and unidirectional cutterbar width.

Note 2 to entry: Provisions for determination of cutterbar height are given in ISO 8909-2.

5.15.2

rotary flail cutter height

minimum height between the cutting blade rotating periphery and the plane on which the machine stands

Note 1 to entry: Provisions for determination of rotary flail cutter height are given in ISO 8909-2.

5.15.3

rotary disc height

height at the level that the stalks are sheared, either at the forward tip of the stationary knife or at the forward intersection of the pair of rotary knife discs

Note 1 to entry: Provisions for determination of rotary disc height are given in ISO 8909-2.

5.16

head mass

mass of the freestanding complete head equipped for field operation

Note 1 to entry: Expressed to the nearest ten kilograms.

5.17

cutterbar frequency

number of cycles which the cutterbar makes in a given time period

Note 1 to entry: Expressed in cycles per minute.

5.18

cutterbar stroke

distance that a point on the cutterbar travels in one half-cycle

Note 1 to entry: Expressed in millimetres.

5.19

feedroll throat area

product of multiplying the feedroll housing inside width at the plane formed by the centerlines of the upper and lower feedrolls nearest the cutterhead times the maximum height between the rear feedroll effective feeding diameters

Note 1 to entry: Expressed in square millimetres.

Note 2 to entry: For forage harvesters with only one feedroll, it is the product of multiplying the feedroll housing inside width at the feedroll times the maximum height measured perpendicular from the floor to the feedroll effective feeding diameter.

5.20.1

smooth feedroll with no protrusions

roll outside diameter

5.20.2

feedroll with unnotched protrusions

roll outside diameter around protrusions

5.20.3

feedroll with notched protrusions

roll outside diameter around protrusions minus the depth of one protrusion noted

5.21.1

cylinder cutterhead

included angle between the knife leading surface at the cutting tip and a radial line perpendicular to the axis of rotation passing through the knife cutting tip

5.21.2

flywheel cutterhead

included angle between the knife leading surface at the cutting tip and a line parallel to the cutterhead axis of rotation

5.22

cylinder cutterhead knife helix angle

arctangent of the arc length described by the knife cutting edge divided by the cylinder width

Note 1 to entry: See Figure 3.

Note 2 to entry: For cutterheads with multiple, segmented width knives, the effective knife stagger helical angle across the banks is the arctangent of the arc length described by a line passing through the mid-point of each knife divided by the cylinder width (see Figure 4).

5.23

flywheel cutterhead knife shear angle

included angle between the cutterhead knife and the stationary knife in a transverse direction

Note 1 to entry: See Figure 5.

5.24.1

cylinder cutterhead

clearance between the cutting edges of the cutterhead knives and the stationary knife, transverse to the axis of rotation

Note 1 to entry: Expressed in millimetres.

5.24.2

flywheel cutterhead

clearance between the cutting edges of the cutterhead knives and the stationary knife, parallel to the axis of rotation

Note 1 to entry: Expressed in millimetres.

5.25

theoretical length of cut

TLOC

calculated theoretical stem or particle length produced by a forage harvester determined by dividing the crop mat velocity by the cutterhead knife cuts per unit of time

Note 1 to entry: See calculation methods in ISO 8909-2.

5.26

crop mat velocity

average peripheral velocity of the upper and lower rear feedrolls

6.1

plant length

average length of the unharvested plant from ground level to its tip when the plant is straightened

Note 1 to entry: Expressed in metres to the nearest tenth.

6.2

stubble height

average length of the plant stalk after harvesting when the stalk is straightened and measured from the cutting edge perpendicular to ground level

Note 1 to entry: Expressed to the nearest 10 mm.

6.3

crop yield

average yield on a wet and dry mass basis

Note 1 to entry: Expressed in tonnes per hectare.

6.4

grain/straw ratio

total cereal grain mass divided by the total straw mass yielded per unit area

6.5

row spacing

average distance between rows between the centrelines of adjacent row units

Note 1 to entry: Expressed in millimetres to the nearest 10 mm.

6.6

kernel/stalk ratio

grain/stalk ratio

total kernel or grain mass divided by the total stalk mass yielded per unit area