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注射機變頻改造中常見問題的解決

來源:塑膠咨詢發布時間:2021-03-29 18:57:54點擊率:

注射機載重特性為恒轉矩類,機械特性較硬,對動態特性要求較高,因此應選擇注射機專用變頻器。注射機專用變頻器是在通用變頻器的基礎上,增加0~1 A信號轉換環節,提高其使用性能。針對注射工藝各階段對時間的一定要求,變頻器加減速時間要短,一般為1秒,因此變頻器的容量要適當增大。工程人員建議采用正藝注塑機專用恒矩變換器。因其工藝的特殊性,在注塑機的改造過程中會遇到各種各樣的故障,下面就是變頻改造注塑機經常遇到的問題和處理方法。

一、頻率不變的轉換器
因為變頻器采用注塑機閥控電流信號進行調速,在運行過程中出現了0.0的頻率顯示不理想(有的變頻器顯示為0)的現象,主要原因是:信號極性接反;信號取錯;信號接線口不符合參數設定;注塑機輔助電源出現故障等,應首先確定注塑機閥控制的是電流信號、電壓信號還是脈沖控制信號(部分機型),以及信號正負極性是否與變頻器控制端相對應。
二、油泵噪音
轉爐運轉后,注塑機油泵會產生異常噪音,此時應判斷噪聲源在哪里,是來自電機還是來自油泵,如果噪音來自油泵,可能是由于:注塑機油泵液壓油過少,有空氣吸入;注塑機油濾器或油路堵塞;注塑機油泵葉片磨損較大;遇有特殊情況,應先檢查注塑機油泵,排除故障后再運轉,另外,注塑機油泵在低速高壓工作狀態下,也會出現油泵噪音異常,此時適當提高轉速信號。
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