Assessments - 3, GPA: 4.3 ( )

Fabricante : Unigreen Arquivo Tamanho: 1.22 mb Arquivo Nome : Língua de Ensino:

6.2.2 LOW VOLUME CONICAL NOZZLES (150-500L/HA) Made of two ceramic pieces with colour-coded plastic inserts, they are available in various sizes identified by the colour (see table 3 page 32). They have been specifically designed to obtain a large number of small drops with strong turbulence even at low pressures (2-3 bar). This turbulence makes them suitable for penetrating luxuriant vegetation and so they are suitable for fungicides and insecticides. The nozzles of the TR Lechler and TXA Teejet series are in this category. 6.2.3 ANTI-DRIFT NOZZLES Specific anti-drift nozzles are available from Unigreen. The main characteristic of these nozzles is that they eliminate the fog effect caused by the presence of drops that are too small and are particularly sensitive to drifting. For further information please contact Unigreen for the relevant instruction handbook. 20 unigreen 6.3 CALIBRATING TURBO TEUTON The tables on pages 26-31 let you easily calculate the distribution in litres/ hectare of the mistblowers with the standard fittings, proceeding as indicated below: a) Choose the table relevant to the blower group of the mistblower in question (the main reference is the number of jets) b) Find the distance between the rows of the vegetation and the diameter of the nozzles used (ceramic plates, TR or TXA). c) In the horizontal strip, choose the working speed and the distribution in litres/hectare and on the vertical scale find the pressure to use. d) Adjust the pressure to obtain the treatment required. If the distance between the rows is different from that in the table you can easily calculate the distribution in proportion: for example with a distance between the rows of 8 m, divide the figure for the litres/hectare of the distance between the 4 m rows by half, with a distance between the rows of 2.5 m double the figure for the distance between the 5 m rows. The last line of the table indicates the overall delivery of the fan. If the mistblower is fitted with non-standard nozzles, the spraying tables of the single nozzles per mistblower are on page 32. To calculate the distribution in litres/hectare, use the following formula: Vd = 600 x Q I x V where: Vd = volume to distribute (L/ha) Q = sum of the nozzles delivery (L/min) I = distance between the rows (m) V = tractor speed (Km/h) 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: 907lt/ha with row distance 3m. 907x3 = 971 Lt/ha with row distance 2,8m 2,8 EXAMPLE: Distance between the rows: 5 m Speed: 6 Km. / h Working air pressure 30 bar Fan O 800 with 14 standard, high volume nozzles (O 1.0) Q total delivery of the nozzles (Tab. 1 page 34) 2.96x14= 41.44 L/min Vd = 600 x 41.44 = 829 L/ha 5 x 6 N.B. : Depending on the season the vegetation may be more or less luxuriant; bear this in mind before starting the treatment. If the plants don’t have much foliage you should diminish the quantity of litres per hectare using lower pressures or closing one or more jets of the fan. unigreen 21 A A FIG. 22 7 HAND LANCES When using hand lances bear in mind the following notes: = Don’t direct the jet of liquid towards electric power lines or zones where there is electrical current, houses or where people might pass. = Don’t point the jet at people or animals. The jet can cause serious injuries simply due to the mechanical force of the liquid under pressure. = Never block the spraying lever of the lance in an open position because if the lance falls it will be uncontrollable. = At the end of work after you have stopped the pump, make sure that any residual pressure in the pipes under pressure has been drained to avoid unexpected jets when putting the lance away. There are various types of lances; with a lever, mitra spray gun and pistol grip. For further information please refer to the handbook in the package. The lever lance is controlled by opening lever A which, depending on how much it’s pressed, produces a conical spray or direct jet. The standard nozzle is O 1.5 The mitra spray gun can produce a direct jet or a conical spray and the type of spray is selected by pushing lever B forwards or backwards. Use lever C to open the jet. The standard nozzle is O 2.5 Replacement nozzles are available for all of the lances and the capacities are indicated in the tables TAB.4 and TAB.5 ( page 32). 8 MAINTENANCE All of the maintenance operations and repairs must be carried out with the machine and cardan shaft stopped and the tank and circuit clean of any residues of chemical products. The maintenance of the mistblower is essential for maintaining a high level of safety. Also consult the single handbooks of the main components of the mistblower. WARNING: the indications to follow for using chemical products are indicated in paragraph 2.2.1. 8.1 PROGRAMMED MAINTENANCE (TAB. N° 7, page 33) We recommend using a table of programmed maintenance...

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