The tunnel sprayer is made of two vertical concave
shields with opposite concavity, with the function of
capturing the liquid off-target and two basal collectors
from where it is sent back to the tank. The shields enclose
the canopy on two sides and are connected by a roof that
closes the upper side of the chamber as shown in Fig. 1.
Each shield is divided along its vertical axis by a separation
wall supporting two 600 mm diameter axial fans,
powered by hydraulic motors. They produce an air
stream directed against a vertical boom with eight flatfan
nozzles, spaced at 0)45 m intervals.
During operation, the fans rotate at 167 rad s~1 and
globally produce an airflow rate of 11 m3 s~1 at an average
velocity of about 8 ms~1 at the nozzles. The power
consumption at the power take off of the entire equipment,
including the pump of the sprayer, is about 16 kW.
The two shields are supported by a frame linked to
a trailed carrier on which the components of the
sprayer are mounted (membrane pump, tank, constant
pressure regulator and hydraulic motor for operating the
fans).
The reciprocal position of the shields is adjustable
with an hydraulic system to fit the thickness of the
plants and to simplify the manoeuvres and the turns.
The same circuit allows the folding of the shields behind
the tank to reduce the width of the machine during the
transport.
The equipment can be classified as an air circulation
tunnel sprayer with recovery of surplus spray. The peculiarity
of the system is an internal air circulation which
has the function of keeping the spray in the space occupied
by the foliage until it is intercepted either by the
leaves or by the shields and the collectors. In other words,
the concept is that no external air is forced to enter the
chamber and no air is pushed out.
This equipment was compared in the field trials with
a classical trailed air-blast sprayer without deflectors
with a 900 mm diameter axial fan, rotating at
1600 min~1 and producing an airflow rate at an outlet of
10 m3 s~1 in the trial conditions. These settings were
chosen according to the structure of the vegetation and
were obtained at 420 min~1 of the power take o!. There
are 16 hydraulic hollow-cone nozzles shared, as usual,
between two half-booms. The nozzles have different flow
rates to achieve a vertical distribution as uniform as
possible.
The tunnel sprayer is made of two vertical concaveshields with opposite concavity, with the function ofcapturing the liquid off-target and two basal collectorsfrom where it is sent back to the tank. The shields enclosethe canopy on two sides and are connected by a roof thatcloses the upper side of the chamber as shown in Fig. 1.Each shield is divided along its vertical axis by a separationwall supporting two 600 mm diameter axial fans,powered by hydraulic motors. They produce an airstream directed against a vertical boom with eight flatfannozzles, spaced at 0)45 m intervals.During operation, the fans rotate at 167 rad s~1 andglobally produce an airflow rate of 11 m3 s~1 at an averagevelocity of about 8 ms~1 at the nozzles. The powerconsumption at the power take off of the entire equipment,including the pump of the sprayer, is about 16 kW.The two shields are supported by a frame linked toa trailed carrier on which the components of thesprayer are mounted (membrane pump, tank, constantpressure regulator and hydraulic motor for operating thefans).The reciprocal position of the shields is adjustablewith an hydraulic system to fit the thickness of theplants and to simplify the manoeuvres and the turns.The same circuit allows the folding of the shields behindthe tank to reduce the width of the machine during thetransport.The equipment can be classified as an air circulationtunnel sprayer with recovery of surplus spray. The peculiarityof the system is an internal air circulation whichhas the function of keeping the spray in the space occupiedby the foliage until it is intercepted either by theleaves or by the shields and the collectors. In other words,the concept is that no external air is forced to enter thechamber and no air is pushed out.This equipment was compared in the field trials witha classical trailed air-blast sprayer without deflectorswith a 900 mm diameter axial fan, rotating at1600 min~1 and producing an airflow rate at an outlet of10 m3 s~1 in the trial conditions. These settings werechosen according to the structure of the vegetation andwere obtained at 420 min~1 of the power take o!. Thereare 16 hydraulic hollow-cone nozzles shared, as usual,between two half-booms. The nozzles have different flowrates to achieve a vertical distribution as uniform aspossible.
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