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.
=++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
相關產品推薦：
本文關鍵詞：
不銹鋼旋振篩
超聲波振動篩
