IC660BBA025
IC660BBA025
IC660BBA025
IC660BBA025
上料臺(tái)車(chē)將金屬卷材送至開(kāi)卷機(jī)上。板材由開(kāi)卷機(jī)引出，經(jīng)過(guò)展平機(jī)初步整平，送入修邊機(jī)實(shí)施板材縱剪，按工藝要求完成板材寬度的加工。校平機(jī)由15根校平輥（七上八下）和一對(duì)牽引輥組成，它也是這條生產(chǎn)線的主牽引機(jī)。經(jīng)過(guò)校平機(jī)后，平整的板材經(jīng)緩沖坑，然后，由定尺送進(jìn)按一定的板材長(zhǎng)度定量送入剪扳，機(jī)實(shí)施板材剪切。皮帶機(jī)將加工完好的合格板材輸送到堆料小車(chē)上。兩臺(tái)碎邊機(jī)安裝在修邊機(jī)后，分別將縱剪下來(lái)的兩條下腳料破碎，以便運(yùn)輸存儲(chǔ)。為了提高生產(chǎn)效率，加快剪切速度，本生產(chǎn)線上的橫剪刀采用液壓馬達(dá)驅(qū)動(dòng)。
由本生產(chǎn)線的工藝流程可以看出：開(kāi)卷、展平、修邊、碎邊和校平應(yīng)在一個(gè)線速度V1下同步運(yùn)行。定尺送進(jìn)和皮帶之間設(shè)有橫剪刀，因此，定尺送進(jìn)、皮帶和橫剪刀是斷續(xù)運(yùn)行，同時(shí)，它的運(yùn)行速度V2應(yīng)大于V1。在校平機(jī)與定尺送進(jìn)機(jī)之間的緩沖坑，其作用是：平衡V1和V2之間的速度關(guān)系，保證生產(chǎn)線的穩(wěn)定運(yùn)行。
三、電氣控制方案：
展平、修邊、碎邊和校平的運(yùn)行速度容易實(shí)現(xiàn)同步，只要將電機(jī)的旋轉(zhuǎn)速度按照自身的減速器、傳動(dòng)輥?zhàn)拥鹊臋C(jī)械參數(shù)折算成線速度，與生產(chǎn)線的線速度V1統(tǒng)一即可。
在開(kāi)卷工作中，由于卷徑是在不斷變化的，開(kāi)卷電機(jī)的旋轉(zhuǎn)速度與生產(chǎn)線的線速度V1很難找到匹配關(guān)系。換句話(huà)說(shuō)，如何解決開(kāi)卷機(jī)與整條生產(chǎn)線的運(yùn)行速度V1同步的問(wèn)題，是電氣設(shè)計(jì)的主要工作之一。 定尺送進(jìn)、橫剪刀和皮帶是斷續(xù)運(yùn)行。板材由定尺送進(jìn)機(jī)的牽引輥按照加工要求的長(zhǎng)度送入剪扳，機(jī)進(jìn)行橫向剪切。因此，定尺送進(jìn)機(jī)是生產(chǎn)線的位置控制精度要求最高的設(shè)備。
目前，開(kāi)卷機(jī)的控制有以下幾種方案：
①、 電磁滑差調(diào)速：手動(dòng)調(diào)節(jié)開(kāi)卷機(jī)的轉(zhuǎn)速，使之與生產(chǎn)線的線速度一致。
②、 張力控制：利用板材表面張力恒定的原理，使之自動(dòng)跟隨生產(chǎn)線的線速度。
張力控制的實(shí)施又分為：力矩電機(jī)、直流電機(jī)、張力控制器等。
方案①的優(yōu)點(diǎn)：電氣控制簡(jiǎn)單，造價(jià)低廉。缺點(diǎn)：控制方式陳舊，勞動(dòng)量大，效率低，耗能高，無(wú)法實(shí)現(xiàn)生產(chǎn)線的自動(dòng)運(yùn)行。
方案②的優(yōu)點(diǎn)：操作簡(jiǎn)單，自動(dòng)化程度高。缺點(diǎn)：控制復(fù)雜，造價(jià)高昂。
我們經(jīng)過(guò)調(diào)研，決定采用艾默生TD3300張力控制交流變頻器，使開(kāi)卷機(jī)在張力的控制下，自動(dòng)跟隨生產(chǎn)線的線速度。在自動(dòng)化程度不降低的前提下，大大降低了開(kāi)卷生產(chǎn)線的制造成本，提高了性能價(jià)格比。
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