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。
?。?）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。
?。?）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。
新聞:南海區(qū)50步進(jìn)電機(jī)23HS5610
也必然導(dǎo)致市場(chǎng)的混亂，非常不利于行業(yè)的健康發(fā)展。資料顯示，機(jī)械工業(yè)聯(lián)合會(huì)曾于27年先后以中機(jī)聯(lián)標(biāo)[27]55號(hào)56號(hào)118號(hào)文件公布了335項(xiàng)機(jī)械行業(yè)標(biāo)準(zhǔn)情況，其中涉及工程機(jī)械的行業(yè)標(biāo)準(zhǔn)僅有1項(xiàng)，包括進(jìn)口二手挖掘機(jī)驗(yàn)收規(guī)范垃圾壓實(shí)機(jī)混凝土布料機(jī)及少數(shù)鑿巖機(jī)械類標(biāo)準(zhǔn)。其中分別是26及27年的標(biāo)準(zhǔn)代替了1993年左右的舊標(biāo)準(zhǔn)，足見(jiàn)標(biāo)準(zhǔn)化工作之落后局面。各標(biāo)委會(huì)及行業(yè)企業(yè)紛紛出力211年3月2日，經(jīng)過(guò)標(biāo)準(zhǔn)化管理委員會(huì)批準(zhǔn)，全國(guó)混凝土機(jī)械標(biāo)準(zhǔn)化分技術(shù)委員會(huì)在湖南正式成立，我個(gè)人擔(dān)任該委員會(huì)主任委員。
新聞:南海區(qū)50步進(jìn)電機(jī)23HS5610
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伺服與變頻的一個(gè)重要區(qū)別是:
變頻可以無(wú)編碼器,伺服則必須有編碼器,作電子換向用，交流伺服的技術(shù)本身就是借鑒并應(yīng)用了變頻的技術(shù)，在直流電機(jī)的伺服控制的基礎(chǔ)上通過(guò)變頻的PWM方式模仿直流電機(jī)的控制方式來(lái)實(shí)現(xiàn)的，也就是說(shuō)交流伺服電機(jī)必然有變頻的這一環(huán)節(jié)：PLC資料變頻就是將工頻的50、60HZ的交流電先整流成直流電，然后通過(guò)可控制門極的各類晶體管(IGBT，IGCT等)通過(guò)載波頻率和PWM調(diào)節(jié)逆變?yōu)轭l率可調(diào)的波形類似于正余弦的脈動(dòng)電，由于頻率可調(diào)，所以交流電機(jī)的速度就可調(diào)了(n=60f/2p ，n轉(zhuǎn)速，f頻率， p極對(duì)數(shù))。
新聞:南海區(qū)50步進(jìn)電機(jī)23HS5610
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新聞:南海區(qū)50步進(jìn)電機(jī)23HS5610
INA軸承中向心球軸承的鑒定技術(shù)狀態(tài)正常的向心球軸承，其內(nèi)、外圈滾道應(yīng)無(wú)剝落和嚴(yán)重磨痕，并呈光亮的一條圓弧溝槽；所有的滾珠應(yīng)保持圓形，表面點(diǎn)、裂紋和剝落；保持架不松散、不破碎、未磨穿。當(dāng)用一只手持內(nèi)圈，另一只手迅速輕推外圈旋轉(zhuǎn)時(shí)，要求旋轉(zhuǎn)平穩(wěn)，只聽(tīng)到滾珠在滾道上滾動(dòng)的輕微聲響，無(wú)振動(dòng)；停止時(shí)應(yīng)逐漸減速，停后無(wú)倒退現(xiàn)象，正常的向心心球軸承，其內(nèi)、外圈與滾動(dòng)體之間的間隙為.5-.1mm，當(dāng)沿徑向晃動(dòng)內(nèi)外圈時(shí)，應(yīng)感覺(jué)無(wú)間隙。
