50066076 + 50068658

50066076 + 50068658

 
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 電機(jī)車(chē)在露天煤礦運(yùn)輸中擔(dān)負(fù)著重要的作用,多年來(lái),由于機(jī)車(chē)所使用的壓力控制器因部件磨損等原因?qū)Π踩a(chǎn)造成*的隱患。為了從根本上解決因控制器誤動(dòng)作而造成的事故,我們選用了目前常用于船艦,冷凍設(shè)備及其它產(chǎn)業(yè)設(shè)備上用于對(duì)氣體壓力進(jìn)行二位式控制的YWK502C型壓力控制器,對(duì)現(xiàn)有的控制器進(jìn)行了改造。該壓力控制器的控制范圍為- 0. 1～1. 5MPa,zui小切換差范圍≤0. 0065～0. 1MPa,zui大切換差的范圍≥0. 026～0. 28 MPa,重復(fù)型誤差范圍正負(fù)0. 003～0. 05 MPa,設(shè)定誤差范圍正負(fù)0. 004～0. 06MPa,介質(zhì)溫度為- 40°C～60°C,觸頭容量為380V、3A,環(huán)境溫度- 25°C～ + 55°C,抗震性能為2～25Hz?？紤]到原電機(jī)車(chē)上每臺(tái)電磁接觸器的額定電壓50V、持續(xù)電流0. 375A,導(dǎo)線,電阻為95Ω等條件,故確定此型號(hào)的壓力控制器可以在電機(jī)車(chē)上使用。

該壓力控制器的作用是靠波紋管的伸張、收縮,達(dá)到可動(dòng)觸頭與固定觸頭閉合或斷開(kāi),以達(dá)到控制空氣壓縮及在規(guī)定壓力下啟動(dòng)泵風(fēng)后停止運(yùn)轉(zhuǎn)目的。當(dāng)總風(fēng)缸由zui高規(guī)定壓力逐漸降低時(shí),波紋管開(kāi)始收縮,拉力彈簧處于拉緊狀態(tài),杠桿以支架為軸向上移動(dòng),當(dāng)總風(fēng)缸壓力繼續(xù)下降時(shí)壓力達(dá)到預(yù)先調(diào)好的壓力時(shí)可動(dòng)觸頭與固定觸頭立即閉合,接通電源,空氣壓縮機(jī)立即恢復(fù)泵風(fēng)。隨著總風(fēng)缸壓力不斷升高,波紋管不斷伸張,總風(fēng)缸壓力達(dá)到規(guī)定的壓力時(shí),波紋管同時(shí)也達(dá)到使杠桿移動(dòng),彈簧被拉伸,使可動(dòng)觸頭立即斷開(kāi),切斷電源,空氣壓縮機(jī)停止運(yùn)轉(zhuǎn)。該壓力控制器安裝在電機(jī)車(chē)上,經(jīng)調(diào)試后通過(guò)一段時(shí)間使用,也曾出現(xiàn)過(guò)誤動(dòng)作及燒觸頭等現(xiàn)象。

50066076 + 50068658
針對(duì)YWK2502C型壓力控制器出現(xiàn)的題目,從安裝上看,我們是按照說(shuō)明書(shū)安裝的,應(yīng)該沒(méi)有什么題目,但通過(guò)分析研究后發(fā)現(xiàn),該壓力控制器的波紋管體積小,又是安裝在原壓力控制器的位子,管路直接接在主氣管路上,距翻車(chē)氣門(mén)、制動(dòng)機(jī)構(gòu)與減壓閥近,因而作用頻繁,直接影響壓力控制器的波紋管的伸張或收縮,從而引發(fā)杠桿活動(dòng)體與單刀雙擲金屬片動(dòng)作,使動(dòng)觸頭與固定觸頭閉合和斷開(kāi),而造成的誤動(dòng)作。為了解決這個(gè)題目,現(xiàn)在該壓力控制器前端設(shè)置一個(gè)輔助風(fēng)缸來(lái)穩(wěn)定波紋管的內(nèi)壓力,風(fēng)缸一端開(kāi)有d = 2mm的孔,以防止往返氣流大與管路相接,風(fēng)缸的另一端開(kāi)有d =8mm的孔,與a = 10mm的紫銅管相接,并在風(fēng)缸上安裝放水氣門(mén)。使用表明:在該壓力控制器前端設(shè)置輔助風(fēng)缸后,克服了誤動(dòng)作,節(jié)省了備件消耗,進(jìn)步了效益。

為了進(jìn)一步進(jìn)步該電壓控制器的使用效果,還同時(shí)安裝了直流繼電器和電容,經(jīng)改造后使流過(guò)控制器接點(diǎn)的電流只相當(dāng)于額定電流的1. 08% ,大大低于額定電流,從而保證了接點(diǎn)不易燒損。繼電器線圈受電后,其3對(duì)常開(kāi)接點(diǎn)閉合,接點(diǎn)容量為10A,繼電器3對(duì)常開(kāi)接點(diǎn)并聯(lián),容量為30A,大大高于流過(guò)線路的電流,因3對(duì)常開(kāi)接點(diǎn)容量足夠,接點(diǎn)不易燒損。安裝了直流繼電器電容后,電壓控制器在電機(jī)車(chē)上的使用效果更好。  

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