n. 3-4/2026 23 TECHNOLOGY Robuste molle a spirale o a balestra sono frequentemente adottate nei dispositivi no-stop che corredano gli aratri per prevenire danneggiamenti e rotture nella lavorazione di terreno con abbondante presenza di scheletro Robust coil or leaf springs are commonly used in no-stop devices fitted to ploughs to prevent damage and breakage when working soils with a high stone content during advancement. Weeders also use manually or automatically adjustable preload springs to react to changes in soil consistency by modifying the force exerted on the working parts. Another important use of springs on agricultural machinery concerns the integrity of the working parts to prevent damage and breakages. A well-known example is the “non-stop” devices on plows: if the plow encounters obstacles such as stones, roots or other hard objects present in the soil the protection system ensures that the entire body of the plow immediately lifts automatically, overcoming the obstacle with the advancement of the tool. In addition to the shear bolt - a simple, effective, but irreversible solution (in the sense that it is necessary to replace a broken bolt with an identical one) - and the advanced, but expensive, solution that uses hydraulic cylinders with attached nitrogen shock absorbers, the mechanical version in which robust spiral or leaf springs are used makes for a good compromise, especially since it is a fully reversible operation, one that does not require any maintenance or repair after the springs have come into operation by compressing. Domenico Pessina compromesso, tanto più che si tratta di un funzionamento pienamente reversibile, che quindi non richiede alcun intervento di manutenzione o di riparazione dopo che, comprimendosi, le molle sono entrate in funzione. Domenico Pessina
RkJQdWJsaXNoZXIy NTY4ODI=