三、油的更換
冷卻后油的粘度增大放油困難,減速機(jī)應(yīng)在運(yùn)行溫度下?lián)Q油。
切斷電源,防止觸電!等待減速機(jī)冷卻下來(lái)無(wú)燃燒危險(xiǎn)為止!
注意:換油時(shí)減速機(jī)仍應(yīng)保持溫?zé)幔?br>
在放油螺塞下面放一個(gè)接油盤(pán)。
打開(kāi)油位螺塞、通氣器和放油螺塞。
將油全部排除。
裝上放油螺塞。
注入同牌號(hào)的新油。
油量應(yīng)與安裝位置一致。
在油位螺塞處檢查油位。
擰緊油位螺塞及通氣器。
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PWM調(diào)光電源數(shù)字調(diào)光又稱(chēng)PWM調(diào)光,通過(guò)PWM波開(kāi)啟和關(guān)閉LED來(lái)改變正向電流的導(dǎo)通時(shí)間,以達(dá)到亮度調(diào)節(jié)的效果。該方法基于人眼對(duì)亮度閃爍不夠敏感的特性,使負(fù)載LED時(shí)亮?xí)r暗。如果亮暗的頻率超過(guò)1Hz,人眼看到的就是平均亮度,而不是LED在閃爍。PWM通過(guò)調(diào)節(jié)亮和暗的時(shí)間比例實(shí)現(xiàn)調(diào)節(jié)亮度,在一個(gè)PWM周期內(nèi),因?yàn)槿搜蹖?duì)大于1Hz內(nèi)的光閃爍,感知的亮度是一個(gè)累積過(guò)程,即亮的時(shí)間在整個(gè)周期中所占得比例越大,人眼感覺(jué)越亮。
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機(jī)械制動(dòng)減速的怎樣操作?
答:(1)在減速階段開(kāi)始時(shí),先將電動(dòng)機(jī)操作手柄由極端位置迅速地拉(或推)回到中間位置,然后操作制動(dòng)器手柄進(jìn)行機(jī)械制動(dòng),使提升速度降低至爬行速度。
(2)施閘時(shí)切忌過(guò)快、過(guò)猛及制動(dòng)力過(guò)大,否則提升速度將急劇下降,不僅要二次給電,或加長(zhǎng)爬行階段時(shí)間,還由于減速度過(guò)大而使提升機(jī)的零部件和提升鋼絲繩受到較大的動(dòng)載荷。
(3)施閘也不能過(guò)慢及制動(dòng)力過(guò)小,否則雖不會(huì)使提升機(jī)的零部件及提升鋼絲繩受到較大動(dòng)載荷,但有可能造成過(guò)卷事故。
?。?)為了實(shí)現(xiàn)減速階段速度圖,施加的制動(dòng)力應(yīng)盡可能符合設(shè)計(jì)值。這要根據(jù)設(shè)計(jì)減速時(shí)間、減速運(yùn)行距離的要求,經(jīng)過(guò)實(shí)踐來(lái)確定。
?。?)在制動(dòng)減速過(guò)程中,要特別注意提升速度的變化及深度指示器指示提升容器的位置,根據(jù)具體情況隨時(shí)調(diào)節(jié)制動(dòng)力的大小。
?。?)機(jī)械制動(dòng)減速操作的靈活性和準(zhǔn)確性,同所使用的提升機(jī)的制動(dòng)裝置的制動(dòng)力調(diào)節(jié)性能有關(guān),操作工必須對(duì)所使用的制動(dòng)裝置的結(jié)構(gòu)、原理及制動(dòng)力的調(diào)節(jié)了解得非常透徹才行。
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旋轉(zhuǎn)速度按推薦的條件選擇。為防止因軸承磨損引起的偏心回轉(zhuǎn)振動(dòng)等,應(yīng)定期檢查回轉(zhuǎn)部分的精度和調(diào)整平衡。鉆頭工件旋轉(zhuǎn)加工通孔時(shí),當(dāng)鉆通時(shí)切剩部分常會(huì)高速飛出,這種飛出物呈圓盤(pán)狀且很鋒利,十分危險(xiǎn)易造成事故。請(qǐng)使用安全罩,保護(hù)眼睛等防保用具,并在夾持部分裝上外罩。極小直徑的鉆頭其頂部是尖形,十分銳利,用手接觸不小心易刺傷。鉆頭折斷在工件內(nèi)將難以取出,還有可能折斷飛出,易造成傷害事故。操作時(shí)必須充分注意安全,請(qǐng)使用保護(hù)手套,保護(hù)眼睛。