1343 KB21 KB199920252016Braun, StefanManin, Lionelletnik:62številka:nr. 7/8str. 463-470ISSN:0039-2480COBISSID_HOST:14746395URN:URN:NBN:SI:doc-F5RCAK9WenZveza strojnih inženirjev in tehnikov Slovenije etc.Strojniški vestnikovojniceravni trakovisimulacijestik med trakom in ovojnicostroji za sortiranje pošteModelling the belt-envelope interactions during the postal mail conveying by a sorting machine|The purpose of this study is to predict the trajectory of an envelope when conveyed between two flat belts in a mail sorting machine. Each of the two sides of the envelope is in contact with one belt. The friction coefficient can vary between the two sides, e.g. for the cases of a postcard or a plastic windowed envelope. The two belts are assumed to travel horizontally with the same velocities, but in real world small velocity differences can occur. Also, some deviation from the horizontality of the belts can be observed. These phenomena can lead to unexpected situations where the relative position of the envelope to the belt changes during transportation. The work focuses on the belt- envelope mechanical interactions in order to predict the envelope position during its conveying. A 2D model is developed which considers the dynamic equilibrium of the envelope and simulates the transient behavior at different locations in the sorting machine. In the dynamic friction model, the contact surfaces between the envelope sides and the belts have to be determined at each time step. The belt/envelope friction forces are applied at the centers of these contact surfaces One side of the envelope is considered stuck (in adhesion) to the belt while the other is considered slipping. The position of the envelope center of gravity and the angle with the horizontal axis are calculated. For evaluation of the proposed dynamic model, several cases of operation are simulatedPredstavljena raziskava obravnava mehaniko transporta pošte skozi sortirne stroje v poštnih centrih. Za robustno delovanje teh strojev mora biti zagotovljen pravilen transport pisem, to pa pomeni stabilen položaj pisemskih ovojnic glede na transportni trak. Stroj lahko obdela do 53.000 kosov pošte na uro, odvisno od njihove dolžine. V okviru te raziskave je bilo razvito simulacijsko orodje, ki napoveduje trajektorijo pisma pri transportu med dvema ravnima trakovoma in pri prečkanju več usmerjevalnih kretnic, kjer je stična površina med ovojnico in trakom zmanjšanaTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo