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對(duì)于不同粒級(jí)的物料其破碎能量是不同的，越是小的物料由于內(nèi)部缺陷的逐步減少，其破碎所需的能量就越大。按照能量與線(xiàn)速度的關(guān)系公式:A = mra。
隨著采掘能力的提高，采掘后料塊尺寸不斷增大，而單轉(zhuǎn)子沖擊式破碎機(jī)由于自身結(jié)構(gòu)合理性等原因限制了給料粒度的增加，因此發(fā)展了雙轉(zhuǎn)子沖擊式破碎機(jī)。為了提高第二個(gè)轉(zhuǎn)子的作用又發(fā)展了有高差設(shè)置的雙轉(zhuǎn)子沖擊式破碎機(jī)，按錘頭磨損及能耗與轉(zhuǎn)子線(xiàn)速度的關(guān)系，第一個(gè)以較低的速度對(duì)物料進(jìn)行粗碎，而第二個(gè)轉(zhuǎn)子以較高的速度對(duì)物料進(jìn)行中細(xì)碎，提高了破碎比。
立式?jīng)_擊式破碎機(jī)、制砂機(jī)是在對(duì)物料進(jìn)行細(xì)碎方面使用的沖擊式破碎機(jī)的代表。我們知道，錘頭的磨損是與錘頭回轉(zhuǎn)線(xiàn)速度的提高呈非線(xiàn)性增長(zhǎng)的，而細(xì)碎時(shí)錘頭的線(xiàn)速度很高，相對(duì)質(zhì)量較輕的物料不能進(jìn)入高速回轉(zhuǎn)錘頭的有效打擊區(qū)(正好處于最高線(xiàn)速度范圍內(nèi))，導(dǎo)致破碎效果下降及錘頭的磨損加劇。立式?jīng)_擊式破碎機(jī)采用的中心給料方式，給入后的物料起始速度接近為零，逐漸加速后從轉(zhuǎn)子體內(nèi)拋射出去進(jìn)行沖擊破碎，改善了沖擊破碎效果并降低了易損件的磨耗。這種破碎機(jī)又演化為機(jī)械式和自襯式兩大類(lèi) 紅星熱線(xiàn)：0371-67825133 文章來(lái)源：http://www.findzsj.com
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