配件5P5000:V1250 5A5001.02 Hard Drive Adapter
配件5P5000:V1250 5A5001.02 Hard Drive Adapter
配件5P5000:V1250 5A5001.02 Hard Drive Adapter
兗州礦業(yè)(集團(tuán))公司南屯煤礦選煤廠針對(duì)ZKG2500/1500型快開(kāi)高壓式隔膜壓濾機(jī)電氣PLC自動(dòng)控制系統(tǒng)及其使用過(guò)程中存在不適應(yīng)生產(chǎn)實(shí)際的問(wèn)題,對(duì)壓濾機(jī)及其配套輔助設(shè)備實(shí)施了一系列技術(shù)改造,有效提高了設(shè)備的安全性、可靠性、自動(dòng)化程度和工作效率。
(1)入料時(shí)間液位PLC控制改造
在入料壓力一定的情況下,其固液分離時(shí)間受煤漿濃度、粒度組成及煤質(zhì)特性(粘度)等影響較大,設(shè)備不能夠自動(dòng)判斷介質(zhì)變化并根據(jù)介質(zhì)的變化自動(dòng)設(shè)置過(guò)濾時(shí)間參數(shù),故而壓力控制失效。他們經(jīng)過(guò)仔細(xì)觀察和認(rèn)真分析得出,濾液水量的多少是固液分離產(chǎn)品成型過(guò)程的主要參數(shù)。為此,根據(jù)這一參數(shù)的變化設(shè)計(jì)了1個(gè)濾液水量檢測(cè)裝置,變被動(dòng)時(shí)間參量設(shè)置控制為斷流變參量延時(shí)智能控制。當(dāng)濾液水量小到一定程度時(shí),檢測(cè)信號(hào)(JDK-201/G型電接點(diǎn)液位控制器)傳給PLC的輸入端。無(wú)論介質(zhì)如何變化,濾水量參數(shù)都不受其影響,能全程檢測(cè)且發(fā)出正確信號(hào)實(shí)現(xiàn)固液分離過(guò)程自動(dòng)控制。此時(shí),PLC的過(guò)濾時(shí)間參數(shù)值可設(shè)定很小,利用它起到微調(diào)作用,時(shí)間參數(shù)變成提高產(chǎn)品質(zhì)量的輔助手段,煤漿的固液分離狀況得到較好控制。
(2)濾液水PLC自動(dòng)切換分離改造
首先對(duì)濾液出水管路進(jìn)行改造。把出水管路分成2支,一路進(jìn)濾液收集池,另一路進(jìn)煤泥水池,分別安裝1套液壓閘閥。通過(guò)自主開(kāi)發(fā)裝配的電氣控制箱控制2套液壓控制系統(tǒng),用PLC輸出點(diǎn)對(duì)進(jìn)料泵進(jìn)行自動(dòng)控制,通過(guò)延時(shí)繼電器實(shí)現(xiàn)管路自動(dòng)切換(時(shí)間可調(diào))。經(jīng)過(guò)摸索試驗(yàn),把延時(shí)控制在120~180s。壓濾機(jī)產(chǎn)生的含有固體顆粒濾液由地溝控制閘板打開(kāi)引入地溝,同時(shí)另一閘板關(guān)閉;然后延時(shí)繼電器開(kāi)始把地溝閘板關(guān)閉,另一閘板開(kāi)啟,將產(chǎn)生的清水引入濾液水池,供給洗煤車間循環(huán)使用。
(3)刮板輸送機(jī)PLC延時(shí)停機(jī)和閉鎖改造
原控制程序中后一次拉板卸料后,刮板機(jī)輸出點(diǎn)立即斷電停車。由于快開(kāi)式壓濾機(jī)卸料方式為分段式一次性拉板卸料,卸料時(shí)間是舊設(shè)備的1/10,而刮板機(jī)鏈子單趟達(dá)10.5m,運(yùn)行速度僅2m/s,因此常因輸送機(jī)過(guò)早停車,刮板上物料尚未卸凈,使刮板機(jī)內(nèi)發(fā)生積料、積水,等下一個(gè)循環(huán)卸料時(shí)造成帶負(fù)荷開(kāi)車,產(chǎn)生過(guò)載保護(hù)而造成停車壓刮板機(jī)事故的發(fā)生。為此,在 PLC設(shè)計(jì)程序中增加1個(gè)定時(shí)器,使刮板輸送機(jī)在壓濾機(jī)3次拉板后,延時(shí)10s再停車;對(duì)PLC的管板運(yùn)行信號(hào)反饋點(diǎn)進(jìn)行閉鎖保護(hù),把刮板機(jī)和膠帶機(jī)輔助常開(kāi)點(diǎn)進(jìn)行串接,然后反饋到PLC的輸入點(diǎn),實(shí)現(xiàn)3臺(tái)設(shè)備順序閉鎖,保證這3臺(tái)設(shè)備無(wú)論哪臺(tái)出現(xiàn)問(wèn)題都能使壓濾機(jī)立即停車,并且在顯示器上作出故障顯示。同時(shí),在2臺(tái)壓濾機(jī)間增加電氣閉鎖。
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