A stainless steel sieving grid is solidly applied above the vibrating bottom. It has three main functions:
– retaining the fertilizer lumps that if were reaching the orifices of the quantity calibration system could block the constant and regular functioning of the feed and distribution system;
– guaranteeing the fertilizer flow towards the vibrating bottom also in presence of consistent quantities of lumpy product (thanks to the vibration);
– decreasing and maintaining constant the fertilizer pressure on the feed system in order to distribute a constant and continuous dose of fertilizer with any volume of product inside the hopper.
With the “VIBRO SYSTEM”, it is now possible to distribute products like powdered lime, sulphates, pellets or organic amenders that cannot normally be spread with traditional systems; it is furthermore advisable to use the VIBRO SYSTEM for the broadcast sowing of various seeds and wet rice; granules reach the distribution system without losing their potentiality to sprout, which can be compromised by frictions due to scrubbing or incisions normally caused by the rotation of agitators inside the product.