1,720,975 research outputs found
Optimized Design of a Simplified Interceptor for Olive Harvesting
No full textIt was been designed and realized a simplified interceptor system with olives harvest nets, to use during the olives harvesting phase for existing olives tree-plant on small surfaces. Such equipment complied to the design requirements of: inexpensiveness for investment and operative use, machine working in continuous, with possibility to use it for other similar crops, minimum employment of workman (an operator). The machine was constituted by a rectangular base climbed on wheels and hauled. It was surmounted by a grate that allowed the sieve of the olives and by a cage of nets, with form of trunk of inverted pyramid that, sustained by mechanically driven bars, succeeded in surrounding the tree locks. The machine tangentially worked to the trees trunks along the convenience order of the olive-tree-plant. By mean a pneumatic command, two telescopic bars that sustained the nets, escaped, so that they surrounded the whole tree trunk, in few second. At this point the shaking phase began. The olives harvested, by mean the inclination of the planes formed by the base nets, they went in the grate impending the tank of the considered machine, and therefore they were collected in the vain underlying. During the performed experimental tests, the detected losses on soil have practically almost been void. Finished such phase, reversing the pneumatic command, the return in initial condition of the nets was had, that is, they were displaced on the right broadside of the considered machine, and it was ready to be reallocated, under the following tre
APPLICATION OF SOFTWARE FOR THE SURFACE SHAPE OF THE CHESTNUTS HARVEST NETS
No full textIn this research conveyance nets for the chestnuts harvest have been considered and the optimization of the surface shape of the chestnuts harvest nets has been performed. Indeed, a steep zone with chestnut trees has been considered, with maximum length of 90 m and maximum width of 60 m and the geometric model of the considered zone has been obtained, by mean GIS system and “Archicad 14” program code, obtaining also the soil local slope distribution. The chestnuts fallen have been simulated by mean a “rain device” available in “Sitetopo” program code. This program has allowed to evaluate the rain draining in function of the considered surface slope. Further, the zone with lower quote, for the considered surface, is the zone in that the chestnuts have to be convoyed, “basin zone”. Indeed, by mean “Sitetopo” program code, it has been possible to evaluate the rain draining contour-plot, and the conveyance effect, that is, where the rain flow is convoyed. This has been obtained by changing of the net surface slope on that, the rain (simulating the chestnuts) fallen. Indeed the nets have been located following the determined optimal surface. In such way all the fallen chestnuts have been convoyed and picked in a determined zone, “basin zone”, and subsequently they have been loaded on the truck for the following workmanships. The evaluated losses have been of around 6-8 % due to chestnuts entangle or little branches obstacle
Progettazione ottimizzata di un impianto di criomacerazione per l’industria enologica.
No full textQuesta ricerca è stata finalizzata all’ottimizzazione tecnologica e produttiva di impianti per la criomacerazione delle uve mediante l’iniezione diretta di CO2 ed alla valutazione della fattibilità di introdurre nuovi materiali innovativi per alcuni componenti dell’impianto.
Durante lo svolgimento della ricerca sono state determinate le caratteristiche termodinamiche fisico biologiche delle differenti qualità di uva considerate, ed esse sono state relazionate con i processi di coltivazione effettuati durante il periodo della sperimentazione, al fine di meglio caratterizzare la qualità d’uva considerata.
Inoltre mediante delle prove sperimentali effettuate su di un impianto per la criomacerazione delle uve con iniezione diretta di CO2, sono stati esaminati e confrontati i risultati ottenuti considerando diverse temperature finali dell’impianto.
E’ stata valutata la distribuzione di temperatura e delle pressioni nell’impianto durante la fase operativa, per caratterizzare le condizioni termodinamiche e tensionali in cui avviene il processo considerato.
Questi risultati sono stati utilizzati anche per la validazione del modello numerico del processo considerato e per individuare idonei materiali innovativi.
Tutto ciò può essere utilizzato anche per determinare, per le specie di uva considerate, il minimo valore di temperatura al di sotto della quale non si apprezzano più miglioramenti qualitativi del prodotto finale ottenuto.
In tal modo si riesce ad ottenere l’ottimizzazione del consumo energetico e di CO2 riducendo i costi ed i fattori inquinanti
The cryo maceration for the wine making industry : technical, viticultural and oenological aspects
No full textIn this paper has been studied a plant for the cryo macerating of the grapes by direct
injection of liquid CO2. On the base of indications of different oenological industries have
been examined the problems rising under limit conditions for the considered plant, and
experimental tests have been performed. By a system of data acquisition the temperature
distribution has been detected along the pipeline, inside it, where the mixing of liquid CO2
with grape juice happen. By different experimental tests has been detected a fluctuating
course of the temperature inside the pipeline. It is due to the turbulent regime and at the
portion of CO2 that it doesn't exhaust thermal exchange inside the considered pipeline. In
order to obtain a better understanding of the phenomena related at these problems, some
simplified models have been considered and simulations by means CFD codes have been
performed and results compared with experimental data obtained. The obtained results are
an important indication for following developments of optimization of such types of plants
A machine prototype for the chestnut mechanical harvest in steep zone
No full textA machine able to perform the mechanical harvest of the chestnuts in the steep zones has been designed and realized. With the aid of a specific software it has been possible to perform a simulation of the different runs planning soil slopes higher than 35%, on spaces with maximum width of 80 cm and backs high 30 cm. Subsequently with the aid of the software Solidworks has been drawn the model in 3D to verify the compatibility of the dimensions of the considered
machinery with the hypothesized spaces. The vehicle is composed of a tracked wagon surmounted by the aspirator and by the whole equipment of harvest. For such machine, once it has started, the operator can manage all the functions necessary to perform the chestnut mechanical harvest by
remote, simply maneuvering by remote control. In such way it is avoided that the operator has to climb on steep slant, to perform manual chestnut harvest; all of this to advantage of the operator safety. The first harvest tests have been performed in only one passage, and they have been aimed to evaluate the functional and operational characteristics, related to the surface of an
hectare. The tests of the machine prototype have been conducted with a speed of 1,8 km/h, with a soil moisture of 12%. Under these conditions, the working operational capacity of the considered machine has been satisfying, thanks also to the low incidence of the times accessories of turning on the total time. In conclusion with the use of such machine the harvest is performed in the full
respect of the safeguard of the operators safety, and considerably guarantees to the farmer an optimization of the harvest operations with times and costs considerably reduced. Further researches and studies are necessary to optimize this machine for different soil and operative conditions
Analysis of a plant for the cryo-maceration of the grapes
No full textA plant for the grapes cryo-maceration that uses the direct injection of CO2 has been studied. Such types of plants allow to obtain wines of high quality, however sometimes because of a bad use of them, it is possible that can rise serious drawbacks. Therefore such search is aimed to study the most critical part of such plant, that is the zone where the injection of the CO2 happens, that is situated in proximity of a divergent tube. After having determined the geometric characteristics of the materials and the thermodynamic characteristics of the fluids (CO2 and mashed grape) a numerical simulation of the thermodynamic exchange between the two considered fluids has been performed, and they have been examined some characteristic conditions
obtaining helpful data results to be used for the optimization of the use of the considered plant
PROGETTAZIONE OTTIMIZZATA DI UN IMPIANTO DI CRIOMACERAZIONE PER L'INDUSTRIA ENOLOGICA
No full textricerca e progettazione di un impianto innovativo per la criomacerazione delle uv
- …
