關(guān)于以上閥控電液系統(tǒng)有較大能量丟掉的不足，為進一步降低能耗，減少噪音，這些年塑料機械制造商為滿足客戶通過節(jié)能降低出產(chǎn)本錢的懇求，對各種節(jié)能控制技術(shù)進行了深化廣泛的研討和實踐，如德國、日本等國展開了運用變量泵和電液份額閥聯(lián)絡(luò)的負載感應(yīng)型注塑機電液控制系統(tǒng)，作為電液控制中最底子的節(jié)能方法，已在國外被廣泛運用?，F(xiàn)在在各種注塑機節(jié)能控制技術(shù)中，份額變量泵與變頻定量泵兩種節(jié)能控制系統(tǒng)，節(jié)能作用明顯。
份額變量泵控制系統(tǒng)可以運用戶根據(jù)注塑成型技術(shù)懇求設(shè)定各種動作壓力、速度，并轉(zhuǎn)換成相應(yīng)的仿照信號，輸給份額變量泵的份額壓力閥及份額流量閥，按設(shè)定值向系統(tǒng)輸出壓力和流量，使液壓系統(tǒng)能量輸出隨從注塑進程負載情況而改動，最大極限避免能量丟掉。變頻定量泵控制系統(tǒng)可以使液壓系統(tǒng)的能量輸出隨從注塑進程整機改動的負載情況而改動，在保壓、冷卻及空轉(zhuǎn)情況堅持很低轉(zhuǎn)速，然后到達節(jié)能目的。一同，使用注塑機同步信號及電氣控制系統(tǒng)，將電液份額控制系統(tǒng)仿照成負載跟蹤控制系統(tǒng)，將傳統(tǒng)定量泵改構(gòu)成變頻變量泵，然后使溢流閥的回油流量降到最小，無高壓節(jié)省能量丟掉，然后將傳統(tǒng)有高壓節(jié)省的注塑機由耗能型晉級為節(jié)能型。
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