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T678A1163
T678A1163年來(lái)隨著微電子技術(shù)、大規(guī)模集成電路技術(shù)、計(jì)算機(jī)技術(shù)和通信技術(shù)等的發(fā)展，PLC在技術(shù)和功能上發(fā)生了飛躍。在初期邏輯運(yùn)算的基礎(chǔ)上，增加了數(shù)值運(yùn)算、閉環(huán)調(diào)節(jié)等功能，增加了模擬量和PID調(diào)節(jié)等功能模塊；運(yùn)算速度提高，CPU的能力趕上了業(yè)控制計(jì)算機(jī)；通信能力的提高發(fā)展了多種局部總線和網(wǎng)絡(luò)(LAN)，因而也可構(gòu)成為個(gè)集散系統(tǒng)。特別是個(gè)人計(jì)算機(jī)也被吸收到PLC系統(tǒng)中。
細(xì)紗機(jī)是紡紗過(guò)程中的后道序，紡機(jī)械的運(yùn)行時(shí)間長(zhǎng)，且需要強(qiáng)驅(qū)動(dòng)力。由于該道序的好壞直接影響到紗線的質(zhì)量和產(chǎn)量，選擇細(xì)紗機(jī)傳動(dòng)用電氣元件是重要的關(guān)鍵。細(xì)紗斷頭是細(xì)紗生產(chǎn)主要的危害，它是細(xì)紗生產(chǎn)實(shí)現(xiàn)高產(chǎn)低耗大卷裝的主要障礙，是提高勞動(dòng)生產(chǎn)率和設(shè)備生產(chǎn)率的絆腳石。
我們知道，以前國(guó)產(chǎn)細(xì)紗機(jī)普遍是不調(diào)速的，針對(duì)不同品種，通過(guò)選用不同的皮帶盤來(lái)確定錠子的轉(zhuǎn)速，這類細(xì)紗機(jī)其紗線在不同階段所受張力不同，在紡紗速度不變的情況下，紗線在紡紗的不同階段所受張力是不同的。小紗時(shí)所受張力大，中紗時(shí)所受張力小，大紗時(shí)所受張力又比中紗大。
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