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工作原理與控制過程 以快速貼面壓機為例。該系列熱壓機共裝有4個油缸,油缸頂置,液壓油路需用6只電磁閥控制,因設計的熱壓機規(guī)格不同,油泵電機的功率從10~22 kW不等,為減小電機起動電流,設計為Y/△起動。膠合板板坯采用小車載入,小車承載部分可單方向運動,小車退出時板坯自動滑落在壓板上。小車驅動電機由變頻器控制,可實現(xiàn)小車快進、慢出。 圖2為快速貼面膠合板熱壓機工藝流程
控制油缸的電磁閥有6只,其中1只1DT為總進油閥;每2個油缸上部、下部油路各自并聯(lián),分2組,每組各有1只上部進油閥3DT、5DT和1只下部進油閥2DT、4DT,還有一只總回油閥6DT。 油缸下部進油,柱塞上移;其上部進油,柱塞下移。即當1DT、2DT、4DT工作時,壓板上升,1DT、3DT、5DT工作,壓板下降并加壓;6DT工作時,油缸卸荷。液壓油泵用三相交流異步電動機驅動,為降低起動電流需要降壓,采用Y/△方式起動,轉換時間為2~5 s。油泵工作正常3 s時,壓板上升到位(設上限位開關)后,壓板停止上升;此時裝板小車載板坯快速進入,到達設定位置后,小車卸板坯并開始后退,碰到后退限位開關后停止后退。 在小車卸板后退的同時,壓板開始下降,當碰到下限位開關后,停止下降,開始保壓并計時,隨著油壓的升高,動、定壓板之間壓力增大,當達到設定上限壓力時,電接點壓力表上限開關斷開,停止加壓。由各組電磁閥自動控制熱壓時所需壓力,實現(xiàn)保壓直到熱壓結束,開始卸荷,3 s后壓板上升。由人工完成卸板。 為了安全起見,在控制線路中加裝轉換開關,在壓機上升控制電路中要加入保護裝置,當壓板上升到位時,手動合上此開關,檢修設備時不會因誤動作而使動壓板下降傷人。同時,在加壓保壓控制電路中,加入了超壓保護開關,目的是防止油壓達到壓力上限后繼續(xù)加壓。若超壓,此開關自動斷開,電磁閥失電關閉,停止加壓。當壓力下降到許可值時,此開關重新閉合,系統(tǒng)控制恢復正常。
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