Drive sys­tems pro­vide con­vey­ing power in grain mill

DEMM Engineering & Manufacturing - - MOTORS AND VSDS -

Gone are the days when mills de­pended on a strong stream of wa­ter or steady wind to power their wheels. In to­day’s mills, elec­tric drives carry out var­i­ous tasks, en­sur­ing ef­fi­cient and re­li­able per­for­mance. A spe­cial chal­lenge lies in the fact that grind­ing is bound to cre­ate dust at­mos­pheres that call for safe, ex­plo­sion­proof drive con­fig­u­ra­tions. The man­u­fac­turer NORD Drivesys­tems has decades of ex­pe­ri­ence in the industry and, draw­ing on a com­plete range of me­chan­i­cal, elec­tric, and elec­tronic drive com­po­nents, can swiftly pro­vide suit­able sys­tems for any of the var­i­ous ap­pli­ca­tions in a grain mill, for in­stance fans and bucket el­e­va­tors.

Based in Wallern in Aus­tria, Arn­re­iter Mühle pro­cesses grain, malt, and oilseeds mostly for the bak­ing and food industry. The fam­ily-owned mill has a his­tory of nearly 200 years. Since the early 20th cen­tury, it has been con­tin­u­ously mod­ernised and ex­panded. 2009 saw the most re­cent ex­haus­tive mod­ern­iza­tion. A high-ca­pac­ity mill with sep­a­rate, state-of-the-art grind­ing tech­nol­ogy and re­fin­ing fa­cil­i­ties was erected. The new build­ing ac­com­mo­dates a wide range of pro­cesses that are car­ried out with a high de­gree of au­to­ma­tion.

The Arn­re­iter mill has a 1,400 kW con­nected load. Up to 80 tons of grain can be ground daily. In ad­di­tion, the re­fin­ing fa­cil­i­ties have a ca­pac­ity of up to 20 tons per day. All pro­cesses, from raw pro­duce stor­age to bag­ging and load­ing, are au­to­mated. There is con­trol level ac­cess to all ap­pli­ca­tions via Profibus. “We need highly flex­i­ble fa­cil­i­ties,” says Wal­ter Arn­re­iter, man­ag­ing di­rec­tor of the mill. “First of all, they must en­able vari­able and par­al­lel pro­cesses with sep­a­rate prod­uct flows and ad­di­tives that can be re­leased from one source into dif­fer­ent lines. And we must also en­sure prod­uct flow with min­i­mal residues.” The main raw ma­te­ri­als are tem­po­rar­ily stored in si­los lo­cated in the up­per sto­ries. Geared mo­tors from NORD Drivesys­tems drive the belt and bucket el­e­va­tors that trans­port the ma­te­ri­als from there. Con­sec­u­tively, the ma­jor part of all prod­uct trans­port takes place in the ex­ten­sive pipe sys­tem that has a to­tal length of 2,500 me­tres. Free-flow­ing and non-flow­ing prod­ucts are vol­u­met­ri­cally dis­pensed by means of a great num­ber of ro­tary dis­charg­ers, all of which need re­li­able geared mo­tors. “NORD sys­tems carry out many dif­fer­ent tasks in our ma­chines,” says Arn­re­iter.

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