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基本工作原理 實驗熱壓機(jī)是木材加工工業(yè)、科研單位、高等院校等的實驗室設(shè)備之一,可作纖維板、刨花板、膠合板、表面裝飾板、塑料板等的熱壓實驗之用。除了加熱系統(tǒng)外,其工作特征和結(jié)構(gòu)與生產(chǎn)型熱壓機(jī)基本相同。圖1為本文所研究的熱壓機(jī)結(jié)構(gòu)簡圖。熱壓機(jī)上壓板2固定,正常工作時通過控制位于壓機(jī)底部的柱塞缸,使得柱塞5帶動下壓板4向上移動,將板坯壓實;經(jīng)過熱壓處理后,柱塞5帶動下壓板4向下移動,到位后為下一次工作做準(zhǔn)備。根據(jù)人造板生產(chǎn)工藝的要求,在壓機(jī)工作過程中,關(guān)鍵是位置控制和壓力控制,系統(tǒng)是通過比例流量閥來進(jìn)行速度調(diào)節(jié),進(jìn)而實現(xiàn)位置控制。
二、PLC控制系統(tǒng)的設(shè)計思路 首先要滿足設(shè)備在生產(chǎn)中的可靠性。因原設(shè)備控制部分元件多,控制線復(fù)雜,排查故障非常困難,為此,可以考慮熱壓機(jī)油缸升降的控制部分采用PLC控制,在滿足要求的情況下,盡量減少輸入點和輸出點,使得整體設(shè)備可靠性提高;另外,考慮到設(shè)備檢修、保養(yǎng)和對新的板種的試生產(chǎn),需要在控制線路中加入手動、自動轉(zhuǎn)換開關(guān);在檢修時,為防止升起的壓板因誤操作發(fā)生位移,加裝了保護(hù)開關(guān),當(dāng)開關(guān)置于保護(hù)狀態(tài),即使發(fā)生誤操作,因有電氣互鎖,也不至于使壓板發(fā)生下移?;谝陨显O(shè)計思路,根據(jù)壓機(jī)工作流程,確定了17個輸入點和14個輸出點,共31個點,采用CPU224產(chǎn)品(該產(chǎn)品有10個輸入點,10個輸出點)連接UN223(該產(chǎn)品有16個輸入點,16個輸出點)。結(jié)合該系列熱壓機(jī)特點,設(shè)計了控制線路,并編制了控制程序;輸入和輸出量編址見表1。
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