Commonly used screening equipment shaker, drum sieve, in which the vibrating screen is divided into the linear shaker (for the screening of the smaller particles), circular vibrating screen (commonly used in stone and the screening of granular materials), vibrating screen the level of work efficiency, in addition to vibration the sun's own design-related outside, heavily influenced by the impact of material circumstances.
The materials of the screening process can be decomposed into two phases:
First of all, the screen on the next level of material wear sifting level materials layer to reach the screen surface, and then sieve to reach the next level of material through the sieve and the sieve on the level of material separation purposes. This means that screening machinery the need to promote the completion of these two phases.
To achieve this purpose, the materials and the hoof surface must have the appropriate relative motion. So that the material was loose state on the one hand, small particles can pass through the coarse particles to reach the screen surface, it is best to make the materials generated segregation, stratification of the materials according to particle size large materials in the upper, fine materials in the next while, in order to facilitate fines through the sieve. On the other hand should be made of materials beating, which will enhance the opportunity of the fine material into the sieve, and to block the sieve in the coarse particles on the sieve to leave.
(2) materials through the sieve the probability
A lot of factors that affect the screening process, difficult to use theoretical methods to quantitatively analyze the screening process and only consider the probability of individual particles through the sieve in order to illustrate the screening process.
Assume the shape of the sieve of square mesh of side length D, the screen wire diameter is b; material particles are spherical, the diameter d.
In one case, the particles perpendicular to the screen and movement, sand washing machine manufacturers across the screen surface. Particles smoothly through the sieve particles can not be collision with the pore wall. This case, the probability of the sieve.
The two kinds of situation is that the direction of particle movement between the screen surface at an angle (Figure I a q), such cases often occur. For example, the screen appear before a certain point of installation, the movement direction and the horizontal plane of the screen surface at an angle. In this case, by the probability of particles.
Screening probability that the sieve-foot:
The larger the particle diameter and the screen wire diameter is smaller, the greater the likelihood of particles through the sieve. When the diameter of the particles close to the sieve size, it is difficult to pass through the sieve. As shown in Table I-12 as shown in the case of b = 0.25D, the particle diameter d sieve size D of 0.07. Its pass through the sieve probability is only 5, 6 quack. Therefore, the nearly sings pore size particles often called hard screen TAI grains.
Particle size must the particles and the screen surface perpendicular to the highest probability of sieve. The materials in the screening process, the direction of vibration of a sieve, if you change the tilt of the screen surface will also change the probability of material through the sieve.
In fact, individual particles pass through the sieve probability is much higher than the theoretical value. Stone washing machine manufacturers This is because the particles collided with a sieve. Wall, as long as its center of gravity in the sieve, is still possible through the sieve. If we consider the anti-jumped after the collision of particles and the screen surface, and again fell to the screen surface, the probability of a single particle through the sieve will be greatly increased.
(3) the particle motion
The screen surface is parallel to the movement of the screen surface, through the sieve of opportunity will be greatly reduced.
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