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有些機器制造者通過繼續改進機器的正常運行時間來實現自動化升級,以擺脫近期碰到的困惑。處于高競爭性的軟飲料產業中的OEM商們意識到:正常運行時間不僅對成功起著至關重要的作用,而且是必不可少的。一小時的停工時間可能導致數萬美元的損失。
一般來說,應用于高速瓶裝產業的堆垛機是液壓驅動的。由于任何基于液壓驅動的控制都存在著舊機器泄漏的危險,在這種情況下,增加了飲料被污染的潛伏可能性。
葫蘆/吊輪在堆垛過程中舉起大貨物,它被以為是堆垛機中最重要和最危險的部分。很多電動和液壓的堆垛機有個題目,即設計無法保持連續和精確地控制葫蘆。結果,這些葫蘆有可能失往控制而使整個貨物掉落下來。除了安全題目外,這些事件還可能導致丟失產品,較長的停工清潔時間,甚至更長的機械維修時間。
一些瓶裝商正經歷一天好幾次掉落貨物的現象,-一些則一個月才出現這種現象。他們與T-TEK、Montgomery、Ala.堆垛機制造商聯系并尋求幫助。不論這種現象是零星發生,還是慣常的,這些瓶裝商們尋找一種可靠的起重控制系統,以消除缺點、失誤和停工期。
T-Tek公司副總裁Brian Traff,以為這是一個機會,可以在堆垛機上用一種電氣系統代替現存的液壓系統,他說,很多機器生產者都猶豫做改變,由于以前在灌裝產業中,電氣系統被以為不可靠。Traff說:“T-Tek的控制設計中有一個關鍵要求:它決不答應貨盤從吊輪上落下來。”
在評估一系列用于起重機控制的交流驅動器后,Traff選擇了Rockwell Automation,該公司的1336再生驅動器答應由堆垛機產生的過剩再生性能量循環轉化為能有助提供灌注生產線動力。這些驅動器也有助于消除來自動力制動器電阻的劇烈熱源。“由于驅動器更友好、合乎環境要求,并且節約了可測得到的能量本錢,T-Tek電動堆垛機成了終端用戶的最滿足的解決方案。”Traff說。
這種驅動器適合T-Tek的需要,使它的堆垛機有了一個編碼器和一個閉環系統。編碼器答應驅動器為電動機提供150%的扭矩,并使葫蘆即使沒有制動也可保持零速—甚至在滿載貨物時。這就造就了一個完全真實的電動堆垛機系統。
“所有堆垛機上的電氣控制系統被證實對顧客是一個徹底的成功,”Traff說,“我們的電動堆垛機很少有停機報道的例子。和液壓系統比較,產品箱子堆疊得更干凈,而且全電氣堆垛機的減速過程運行得更平穩。”
Traff以為,新驅動器技術的升級非常值得,但是他也知道:“我們的客戶不總是控制技術的早期適應者,但我正盡力推進一點。”
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