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巴特熔體計量泵：擠出好的朋友
來源：巴特計量泵、齒輪泵公司 發(fā)布時間：2013-11-02 09:24:54 瀏覽次數：次
在擠出機中，熔體計量泵扮演著不可或缺的角色。它堪稱擠出機好的"朋友"，不僅可以穩(wěn)定輸送熔體物料，還可以比螺桿更有效地提供擠出壓力，而且它可以作為混合裝置使用，用以改善熔體的質量。-巴特一直創(chuàng)造經典，從未停息。
作為擠出機好的"朋友"，熔體齒輪計量泵可以精準地控制機頭的生產量。熔體齒輪計量泵由兩個齒輪組成，通常由一個單獨的電機驅動，由擠出螺桿輸送過來的物料入齒輪的吸入端，旋轉齒輪再將其從另一側送出。其原理是，制作精良的齒輪擁有非常精細的剖面，當齒輪與外殼緊密的配合在一起時，每個齒中的物料量是非常精準的。齒輪可在出料端精準計量物料，齒輪轉速由直流或交流電機驅動控制，其變化率在1%以內。
為什么說熔體齒輪計量泵是擠出機好的"朋友"呢？這是因為，通過精準控制熔體輸出量，熔體齒輪計量泵可消除許多影響擠出機輸出穩(wěn)定性的變量。熔體齒輪計量泵可補償很多不利因素對擠出量造成的影響，如溫度控制不好、進料中斷、聚合物混合成分變化（如再生料含量的改變），以及由于螺桿設計部精準導致的擠出波動等。隨著這些輸出穩(wěn)定性問題的解決，操作者可將注意力更多地放在機頭和下游設備上。
熔體齒輪計量泵的監(jiān)控
然而，熔體齒輪計量泵的運行需要對其進行一定程度的監(jiān)控。觀察的重要指標包括出口壓力、吸入壓力、進出口壓力差、電機電流、齒輪軸的密封以及泵的溫度等。
由于機頭的流量隨著出口壓力的變化而變化，因此出口壓力應該是恒定的。一般來說，出口壓力的波動不能超過±10psi（1psi=0.00689Mpa）。波動較大通常屬于傳動問題，需要電機技術人員調整傳動參數。如果熔體齒輪計量泵磨損嚴重，也會導致這樣的問題。 吸入壓力變化反應了擠出機輸出量的變化。雖然熔體齒輪計量泵的主要功能是消除這些波動，但其能控制的波動范圍是有限度的。即使熔體齒輪計量泵可以連續(xù)保持聚合物的輸出量恒定，但熔體溫度也會發(fā)生變化。因為為保持吸入壓力穩(wěn)定，螺桿速度將會發(fā)生變化，進而引起熔體溫度波動。熔體溫度的波動將直接導致機頭熔體流動及產品尺寸的變化。
理想的吸入壓力的波動范圍不能超過±100psi，好是±50psi.如果波動超過這個值，將導致機頭流量發(fā)生改變。為此，需要降低擠出機電機對壓力波動反應的靈敏度。這通常通過增加比例控制以及檢測壓力的帶寬來使擠出機電機具有這一特性。如果這種方法還不能將波動控制到小，則很可能是擠出機自身的問題，從而將不得不另作分析。
泵齒輪轉動所需的動力應該是恒定的。即使驅動過程中發(fā)生幾個安培的電流變化，也意味著有問題存在。這可能是一個簡單的參數設置問題，也可能是泵體、齒輪箱或傳動軸內的機械問題，或者是吸入壓力波動太大。
熔體潤滑
熔體齒輪計量泵的軸承是由熔體自身潤滑的，這是通過從泵出口端到吸入端并貫穿整個軸承的滲漏設計來實現的。聚合物的流動對保護軸承是十分必要的。這種流動要求泵的出口壓力和入口壓力不能相同，建議兩個口之間的壓力差少應保持幾百psi。
由于熔體齒輪計量泵的軸承采用熔體潤滑，因而軸承外面需有密封來防止聚合物流到齒輪軸的外面。為了能適應不同熔體黏度和泵壓，多數泵都安裝了水冷密封。這就要求合理調節(jié)水量以確保有足夠的水來防止泄露或使泄流減少到微量級。然而，水量也不能過多，因為這會減少軸的潤滑效果并增加熔體齒輪計量泵電機的負荷。
熔體齒輪計量泵啟動后，其溫度應與熔體溫度或熔體設定溫度相匹配。如果泵溫度大大高于設定溫度或實際的熔體溫度，則意味著泵的機械部分或溫控儀表出現故障。實踐證明，熔體齒輪計量泵溫度 低于熔體溫度3-6℃是為合理的。 多功能裝置
除了可以穩(wěn)定輸送意外，熔體齒輪計量泵還具有其他多種優(yōu)勢：相比擠出螺桿，熔體齒輪計量泵提高壓力更加有效，從而使螺桿頭部壓力減小、熔體溫度降低以及螺桿輸出量增加。此外，熔體齒輪計量泵還是一種混合設備，可以改善熔體的質量。
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