|Riassunto in Inglese:|
The manufacturers of agricultural machines must accurately evaluate the risks associated to their utilization and equip them with safety devices. By applying the norms and technical specifications of the Directive 98/37/EC it is possible to obtain the presumption of CE conformity that allows the free trading of said products. The standardization bodies (ISO, EN) issued a series of norms fixing the minimum safety requirements and the relative control tests for the main categories of agricultural machinery.
This paper reports the results of tests on a flail-mower aimed at verifying the sound pressure and sound power levels, the parking stability and the guards effectiveness against accidental ejection of materials according to the reference standards.
The flail-mower was driven by a 58,8 kW tractor that represented an external source of noise. The measurements of A-weighted sound pressure levels (LpA) and of C-weighted sound peak levels (LpC,peak), showed values higher than 85 dB(A). Consequently, the sound power levels have been measured in a fictitious hemispheric zone, comprising the tested machine, showing a maximum value of 104,6 dB(A).
The guards against the accidental ejection of materials have been tested into an “eject-chamber” delimited by Kraft paper target-panels. The number of outward perforations determined by the impacts of test materials, used as projectile on the target-panels, indicated the guards suitability. The results showed that the guards resulted in compliance with the standard.
Finally, the flail-mower has been placed on a 13° inclined plane, showing to be stable in parking, independently from its orientation.