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搖床的特點(diǎn)、基本結構、選分過(guò)程和工作原理

更新時(shí)間:2012-10-22      點(diǎn)擊次數:791

搖床的特點(diǎn)、基本結構、選分過(guò)程和工作原理

搖床是重選廠(chǎng)的主要設備,它的顯著(zhù)特點(diǎn)是富礦比高,常用它獲得zui終精礦,同時(shí)又可分出zui終尾礦,可以有效的處理細粒物料。選分粒度上限為3mm,下限如果選錫石和黑鎢礦可到0.4mm,多用來(lái)選分lmm以下的物料。搖床的結構較復雜,操作不太方便,生產(chǎn)率也較低,占用廠(chǎng)房面積大。這些缺點(diǎn)都在研究改進(jìn)中。根據選分的礦石粒度不同,可分為粗砂搖床,處理大于0.5mm的礦石和處理0.5~0.07mm的細砂搖床,以及處理0.074~0.037mm礦石的礦泥搖床,共為三種。它們的區別主要在于床面來(lái)復條的形式不同。
    它的基本結構分為床面、床頭和機架三個(gè)主要部分。
    (1)床面,可用木材、玻璃鋼、金屬等材料制成。其形狀常見(jiàn)的有矩形、梯形和菱形。沿縱向在床面上釘有許多平行的床條或刻有溝槽,床面由機架支承或由框架吊起。搖床的床面是傾斜的,在橫向呈1.5-5度由給礦端向對邊傾斜,這樣由給礦槽及沖洗槽給入的水流就在床面上形成一個(gè)薄層斜面水流。床面右上方有給礦槽,長(cháng)度大約為床面總長(cháng)度的1/3-1/4;在給礦槽一側開(kāi)有許多小孔,使礦漿均勻地分布在床面上。
     (2)機架或懸掛機構,床面的支承方式為座落式和懸掛式。座落式是床面直接與支架聯(lián)結,并在支架上設有調坡裝置,用來(lái)調節床面的橫向坡度。懸掛式是用鋼絲繩把床面吊在一架子上,床面懸在空中。調整坡度通過(guò)調整鋼絲繩的松緊來(lái)調整。
   (3)床頭,由電機帶動(dòng),通過(guò)拉桿連接床面,使床面沿縱向作不對稱(chēng)的往復運動(dòng)。床面前進(jìn)時(shí),速度由慢到快而后迅速停止;在往后退時(shí),速度由零迅速增至zui大,此后組緩慢減小到零。床面產(chǎn)生縱向差動(dòng)運動(dòng),使床面上礦粒能單向運搬。向精礦端運搬正向運搬,反之叫反向運搬。


 

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