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unigreen 17
5 BLOWER GROUP
All the mistblowers have a high speed fan rotor. You must take great care
and beware of the effects that this can provoke: such as the aspiration and
projection of foreign bodies which, although of a small size, can be very
dangerous especially for the eyes and face.
5.1 AXIAL BLOWER GROUP WITH PULLEY
The mistblowers that have a drive transmission between the pump and fan with
pulleys are equipped with a neutral gear; the multiplied ratio is 1:4.26, the
rotation speed of the fan is 2,300 RPM.
You should periodically check the tension of the belts; if they become too slack
you should tension them by loosening nuts B and screwing in screws A to take
up the slack. Remember to tighten nuts B again after the operation. (FIG.18)
5.2 AXIAL BLOWER GROUP WITH MULTIPLIER
The transmission of the drive from the pump to the fan is done through a
multiplier with one or two neutral gears.
Normally the rotation speed of the fan is 1950 RPM in first gear and 2500 RPM
in second in the multiplier with 2 gear ratios (multiplied ratios 1:3.6 - 1:4.6) and
2,500 RPM in the multiplier with one gear ratio (1:4.6)with the power-takeoff
running at 540 RPM.
You can change from one gear to the next with the lever on the multiplier, made
accessible through the opening on the side in the rear left part of the machine
or at a distance on the right side. The lever has 2 or 3 positions depending on
the number of gears and the central position is neutral (to use only the pump
without the fan).
WARNING: the gear change lever must only be used with the power-takeoff
disengaged and the fan stopped. If it is difficult to engage, turn the cardan shaft
slightly by hand to find the right position of the lever (make sure the tractor is
turned off).
There are two deflectors (one on the right and one on the left) in the bottom part
of the delivery outlet of the fan groups which define the direction of the airflow;
lower if the deflector is lowered and higher if the deflector is raised. For the
system to work properly it should be set up as follows: the left deflector
(looking at the mistblower from behind) raised and the right one lowered in
machines with a multiplier, vice versa in those with a pulley (as the fan turns in
the opposite direction).
For the maintenance of the multiplier (see point 8.2.3 Multiplier Lubrication).
5.3 BLOWER GROUP WITH FRONT SUCTION
These models have front suction with delivery of the air obliquely to the rear of
the machine. This characteristic guarantees greater penetration into the
vegetation (see fig. 19)
There are two models of blower groups with front suction:
- Axial fan: used for treatments similar to traditional multiplier blower groups,
with delivery of the air in a circular crown.
- Tangential fan: for use in small and medium espalier rows of vines. There are
pulley drive versions or multiplier versions, adjustable jets can be mounted to
spray the vegetation at various heights.
The vanes of these blowers have an inclination that can be adjusted by 5°, with
positions from 20° to 40° (as standard this is set at 35°); to adjust the
inclination you have to order the appropriate adjustment discs (Fig. 20, page
18). This operation must only be performed by qualified personnel respecting
the position of the single vanes so as not to vary the dynamic balance of the
fan; unbalanced blowers can cause rapid wear of the multiplier and the fan rotor
itself making the machine unsafe.
FIG. 18
WORK TEMPERATURE
Heat is generated by the friction between the
various moving components and on the basis
of the power transmitted. The temperature
of the multiplier or disengaging box depends
on the capacity to dissipate heat to the
surrounding environment and therefore the
surfaces involved in the heat exchange and
the environmental conditions.
The specifications refer to environmental
conditions with a temperature between
-10° +50°C (14°C -122°F).
The working temperature limit of the box
is 90°C (200°F) established to prevent the
ageing of the seals and guarantee a sufficient
viscosity of the oil. The heat makes the air in
the box expand and therefore increases the
pressure inside. The correct use of the oil
seals is guaranteed up to an internal
pressure of 0.5 bar. Boxes designed to be
used for particularly heavy duty work are
equipped
with a breather cap that can be fitted
on any cast iron box on request.
FIG. 19