unigreen
21
For instance, having a mistblower with fans and knowing:
- the working length L = 3,0 meters;
- the forward speed of 4,0 km/h;
- the tap ringnut in position 5;
- the pressure adjusted at 2,5 bars
you will have a flow rate value of 5,6 l/min. and consequently of 280 l/ha.
Similarly, by knowing the l/ha value to be sprayed, as well as the working
speed and distance, we can obtain the ringnut position and the pressure
which is necessary for treatment.
As the speed values indicated in the tables will hardly correspond to the real
ones, at first it will be necessary to calibrate the speed by operating in the
following way. With the equipment in average working conditions (half-filled
tank), with power take-off at 500 r.p.m. and with the fan/s in operation (without
spraying), drive a measured base of 100 meters, possibly on the field on
which you have to work and measure the time (t) in seconds that you need to
drive it.
Then calculate speed according to the formula:
V = S x 3,6 (1)
t
whereas
S
is the distance in meters (in our case, 100 meters) and t is the
time necessary to drive it.
Example:
if
t
= 66 seconds, you will have V = 100 x 3,6 = 5,4 km/h
66
It is recommended to repeat the calibration with 2-3 different gears in order to
have more data relating to speed.
As - beyond forward speed - also working width may not correspond to the
ones indicated on the table, by using the flow rate in l/min. of the spraying
head (see last line of table No. 3), you may obtain the volume in l/ha
according to the following formula (2):
VOLUME in l/Ha. = 600 x l/min. (2)
working width (m) x working speed (km/h)
Therefore, if from the initial example only working speed is different from V =
5,4 km/h, you will have:
volume in
l/ha
= 600 x 5,6 = 207,4 l/ha
3 x 5,4
If also working width is different, for instance 3,5 m:
volume in l/ha = 600 x 5,6 = 177,8
l/ha
3,5 x 5,4
6.4.1 BATCHING TAPS
(SEE PICTURE 20)
On the equipment VENTAGLI (FANS) there are two batching taps which can
be used to quickly change the flow rate to the jets; ringnut shows the position
we advise of use the position from 4 to 8 (f.i. picture 20 = pos. 6). Each tap
can carry out different positions. In the range of each single mode, for four
different pressures set on the regulator, we obtain four different values of the
litre capacity per minute, for a total of 16 values as you can observe from
table pages 30-31. An increase in pressure means an increase in capacity; a
decrease in pressure means a decrease in capacity. For other types of heads,
the number of positions and the pressure value can be different, as you can
notice on the relevant tables.
PS:
With optional top side diffusers are added two spreading taps additional,
with adjustable independently. (see pg.31 ).
Flow regulation for machines with two flat outlet kit
The spreading tables referred to machines with two flat outlet kit – spalliera /
tendone are purely as an
indication
, as the flow regulator and the 4-ways
collector , due to the normal tolerance of machining and pressing, cannot grant
a perfect uniformity of flow between left and right side.
Consequently we suggest to make a test with clean water by making the following
operations:
By positioning the regulators as the one choose on the table, and after let working
the machine at the correspondent pressure, you can collect the liquid from the
4-ways collector.
(after having removed the Rilsan tubes) in a graduated container.
4916-47
4916-51
4916-55
4916-70
N.B. to calculate the different ranges it is
sufficient to multiply the value lt/hectare by the
corresponding width indicated in the table and
divide it by the new width.
Example-
In the table: 280 lt/ha with row distance 3m.
280x3 = 300 Lt/ha with row distance 2,8m
2,8
FIG. 20
FIG. 21
CALIBRATED PLATE
GASKET
ANTIDRIPPING VALVE
MARKED SIDE
