產品詳情
---電氣比例閥
自動控制可分成斷續控制和連續控制。斷續控制即開關控制。氣動控制系統中使用動作頻率較低的開關式(ON-OFF)的換向閥來控制氣路的通斷。靠減壓閥來調節所需要的壓力，靠節流閥來調節所需要的流量。這種傳統的氣動控制系統要想要有多個輸出力和多個運動速度，就需要多個減壓閥、節流閥及換向閥。這樣，不僅元件需要多，成本高，構成系統復雜，且許多元件都需要預先進行人工調節。電氣比例閥控制屬于連續控制，其特點是輸出量隨輸入量的變化而變化，輸出量與輸入量之間存在一定的比例關系。比例控制有開環控制和閉環控制之分。
結構原理
輸入信號增大，供氣用電磁閥先導閥1換向，而排氣用電磁先導閥7處于復位狀態，則供氣壓力從SUP口通過閥1進入先導室5，先導室壓力上升，氣壓力作用在膜片2的上方，則和膜片2相連的供氣閥芯4便開啟，排氣閥芯3關閉，產生輸出壓力。此輸出壓力通過壓力傳感器6反饋至控制回路8。在這里，與目標值進行快速比較修正，知道輸出壓力與輸入信號成一定比例為止，從而得到輸出壓力與輸入信號的變化成比例的變化。由于沒有噴嘴擋板機構，故閥對雜質不敏感，可靠性高。
特點
1)可實現壓力、速度的無極調節，避免了常通的開關式氣閥換向時的沖擊現象。
2)能實現遠程控制和程序控制。
3)與斷續控制相比，系統簡化，元件大大減少。
4)與液壓比例閥相比，體積小、重量輕、結構簡單、成本較低，但響應速度比液壓系統慢得多，對負載變化也比較敏感。
5)使用功率小、發熱少、噪聲低。
6)不會發生火災，不污染環境。受溫度變化的影響小。
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