中文簡介：
世界上最大的茶葉生產(chǎn)、填裝以及包裝商之一將來自世界各地的茶葉混合起來。在提高產(chǎn)品質(zhì)量的一個步驟中，公司決定取消使用箔來包裝茶葉盒，改為使用其他原料來進行密封以保存其風味。這種變化使重新考慮現(xiàn)存的包裝和運輸系統(tǒng)的控制概念成為必要。
這樣一個加工的操作是很龐大的，跨越250英尺并在20個自動填裝機和最終包裝站之間作為聯(lián)接。在茶葉的特色品種例如薔薇果、胡椒薄荷以及甘菊茶葉被傳送帶運送到最終的包裝站之前，有必要使用包裝箱密封機來密封包裝箱。
當填裝系統(tǒng)正在運行的時候，包裝箱在包裝箱排列站里被折疊和粘合。完成這些操作的包裝箱通過一個聰敏的包裝箱邏輯系統(tǒng)運送到填裝機處。在這里，各種各樣的茶葉品種被分類裝入到達這里的包裝箱。
這個全自動加工過程中有多種柵欄，閥門和電動機來幫助完成控制。
英文原文：
preserving the flavor in tea packaging operation
application overview
one of the world’s largest merchandisers of tea manufactures, fills and packages selected tea blends from all over the globe. in a move to enhance their product, the company decided to abandon the use of foil packaging for tea cartons and changeover to other materials to seal in the flavor. such a change made it necessary to rethink the control concept for the existing packaging and transport system.
the operation is large for such processes, spanning some 250 feet and functioning as a link between 20 automatic filling machines and the final packaging station. before the tea specialties, such as rose hip, peppermint, and chamomile teas, are transported to the final packaging station by the conveyor line, it is necessary to seal the cartons using a carton sealer.
while the filling system is operating, cartons are folded and glued in carton aligning stations. the finished cartons are then transported to the filling machines via a clever carton logic system resembling a shunting yard. the various tea specialties are sorted into the arriving packages at the filling machines.
multiple light barriers, valves and motors help control this fully automatic process.
control system
a pc controls the carton sealer utilizing the standardized iec 1131-3 programming language. this type of program is based on high-level languages and permits the user program to be represented in a manner familiar to any plc programmer, for example – as a standardized instruction list, ladder diagram or function block. the final packaging station is also controlled by interbus.
interbus smart terminal i/o modules pickup the signals from the jam light barriers as well as the contactors which are also decentralized and used for activating the conveyor belt motors.
in addition to the interbus i/o modules, a large-sized text display system is also integrated into the bus topology via an integrated interbus interface.
interbus cmd (configuration, maintenance and diagnostics) software clearly displays interbus system information. in order to guarantee packaging quality in the case of a conveyor jam, for example, it must be possible to switch-off inpidual belts within a specific time, working back from the location of the malfunction. switch-off is done through cmd, and the conveyor restarts automatically and runs normally following correction of the malfunction.
previous solution
the old, conventional contactor control system was initially replaced by a plc in order to achieve the required level of flexibility.
tea cartons reach the final packaging station, which is also controlled by interbus.
results/benefits summary
for reasons of time, the usually complex and cost-intensive parallel cabling was replaced by a modern automation system based on interbus, greatly reducing the amount of cabling required, as well as the related labor and material costs. interbus also made possible the separate, time-saving testing of each prefabricated, decentralized subdistribution boards.
interbus support of the decentralized contactor scheme also saved considerable implementation time, one of the principal reasons for this company’s decision to adopt interbus as its networking standard.