旋轉(zhuǎn)篩

     典型的旋轉(zhuǎn)篩裝料時，是將木屑和木片直接倒在篩選和進(jìn)料端的層面上，落料層面的快速旋轉(zhuǎn)運動使成堆的木片鋪展開，成一定角度傾斜安裝的篩選機(jī)使物料沿篩層向下滑動落到木屑篩選層。當(dāng)碎木屑在篩選過程中遇到合適的篩孔就會通過，而不能通過的大木塊和大木片繼續(xù)沿篩層向前運行。只要篩板沒有破，篩選出來的木屑尺寸應(yīng)該相當(dāng)均勻，并且和篩孔

的尺寸相吻合。旋轉(zhuǎn)篩之所以可行，是因為本質(zhì)上這是一個碎物接近篩孔的問題，是碎物遇到尺寸合適的篩孔的概率，仔細(xì)觀察過該過程的科學(xué)家們撰寫的論文中提到——是否有可能算出任一碎物遇到并通過一個合適開度的篩孔的概率，上述理論被用來計算木材處理工業(yè)中旋轉(zhuǎn)篩選型及應(yīng)用的“傳統(tǒng)智慧”因數(shù)，結(jié)果發(fā)現(xiàn)二者出奇的一致。碎物在篩板上不能找到篩孔的影響因素通常有幾個，首先是來自其他尺寸相近及較大物料的競爭。這可能是一個簡單的裝料率的問題——只要能夠為競爭碎物提供足夠的機(jī)會接近篩板，那么篩選機(jī)就會有足夠的篩選能力。

     在篩板上形成一種特定流態(tài)非常重要，在該流態(tài)下流動性好，呈湍流狀態(tài)，大量的大尺寸物料并不會妨礙木針抵達(dá)篩板表面。為了達(dá)到這種流態(tài)化，篩選機(jī)需要一定的轉(zhuǎn)速和頻率，傳統(tǒng)篩的典型轉(zhuǎn)速為 180 r/min，在該速度下，物料

可能以塞流狀運行而不會形成理想的流態(tài)。目前的篩選機(jī)操作速度為235～300 r/min，這種高頻率及運動振幅的調(diào)整創(chuàng)造了所需的流態(tài)條件。篩體的操作速度和振幅有一定的關(guān)系，轉(zhuǎn)速慢的篩體通常轉(zhuǎn)動半徑較大，高速篩轉(zhuǎn)動的振幅非常小，

這對平衡塊驅(qū)動系統(tǒng)驅(qū)動的篩選及控制其離心力是很有必要的。篩體旋轉(zhuǎn)速度快、振幅小，篩選效果好；而篩體旋轉(zhuǎn)速度較慢，但是要有足夠的振幅，粗篩效果還是可以的。多數(shù)鋸木廠中，一臺篩選機(jī)同時擁有精篩和粗篩這兩個功能。篩板的傾斜角度幾乎都是 7°～8°，有些木材產(chǎn)品篩選所用的篩引用了石料、礦物篩選所用篩。采礦所用的篩呈 20°～25°角，當(dāng)篩板角度為 20°～25°時，木片在篩板表面的停留時間非常短，從而影響篩選效率。木材產(chǎn)品的篩選中，老式篩通常有一個笨重的鑄造底座或者組合底座來抵銷篩筐轉(zhuǎn)動過程中產(chǎn)生的。
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新鄉(xiāng)耐爾特機(jī)械設(shè)備有限公司
聯(lián)系人：孫玲
聯(lián)系方式：13072620583
地址：新鄉(xiāng)市牧業(yè)區(qū)宏力大道西冀場工業(yè)園
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Sawdust is usually produced in chipping process of wood powder mixed with wood chips orsawdust in the sawmill some operation process, is the need to remove the components in prior to pulping. The traditional method is to configure different sieve mesh layer vibration sieve(rotary screen) in the treatment of rotary screen, some limitations led to the development of other technologies, including now used for roll screen. These new technologies include a lot of technological innovation, the application range is more extensive, wood chip removal and some other screening method.

Rotary screen

Rotary screen loading typical, sawdust and wood chips will be poured directly on the screen andthe feed end level, falling fast rotating movement of material level make piles of wood spreadinto a certain angle, screening machine installation of the material along the screen layer sliding down to the sawdust layer of screening. When the chips met the right mesh will in the course of screening by, and not through the big wooden and large chips continue to run forward along thescreen layer. As long as the sieve plate is not broken, screening out the wood size should befairly uniform, and the sieve

Size consistent. Rotary screen is feasible, because this is essentially a debris near the meshproblem, is the probability of debris encountered suitable sieve size, carefully observe the writing of the scientists of the process mentioned in the paper -- whether it is possible to work out anydebris encountered and through a suitable opening sieve probability, the theory is used to calculate the wood processing industry rotary screening and application of "conventional wisdom" factor, the results showed that two were surprisingly consistent. Debris not on the sieve plate sieve effect factor and found there were usually several, the first is from other similar sizeand larger materials competition. This may be a simple loading rate problem -- as long as youcan provide enough opportunity to get close to the plate for competitive debris, so screening machine will have adequate screening ability.

On the sieve plate to form a specific pattern is very important in the flow of good fluidity, aturbulent state, a lot of big size material does not obstruct the wooden needle arrived in thesieve surface. In order to achieve this kind of fluidization, screening machine need speed andfrequency of some typical traditional screen, speed is 180 r/min, the speed at which, material

Flow is likely to plug flow like running without the formation of ideal. Screening machineoperating speed at present is 235 ~ 300 r/min, the high frequency and motion amplitudeadjustment to create flow conditions required. There is some relationship between the sievebody of the operation speed and amplitude, slow speed rotating sieve body usually larger radius, high speed screen rotation amplitude is very small,

This drive to balance block system driven by screening and control of the centrifugal force isvery necessary. The sieve body rotation speed, small amplitude, the screening effect is good;and the screen body rotation speed is slow, but there must be sufficient amplitude, screeningeffect can still. The majority of the sawmill, a screening machine also has fine screen and screenthese two functions. The tilt angle of the sieve plate is almost 7 degrees to 8 degrees, and somewood products used in screening sieve cited stone, mineral screening using sieve. The miningsieve is 20 DEG to 25 DEG angle, when the sieve plate at an angle of 20 DEG to 25 DEG, woodis very short residence time in the sieve surface, thus affecting the efficiency of screening.Screening of wood products, old-fashioned screen usually have a heavy casting base orcombined base to generate offset screen basket to rotate in the process of.
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