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The process of dividing a mixture of different particle sizes into a plurality of different particle size levels by a single layer or a multi-layer sieve is called sieving. The screening equipment has a fixed sieve, an inertial vibrating screen, a self-centering vibrating screen, a heavy-duty vibrating screen, a resonance screen, and a linear vibrating screen.
1, fixed sieve
The fixed sieve is composed of steel bars or steel bars arranged in parallel. The steel bars and steel bars are called grid bars, and the bars are connected by the cross bars. The size of the gap between the bars is the size of the mesh holes. The fixed sieve is divided into two types: a sieve and a sieve.
2, inertial vibrating screen
Vibrating screen is a kind of sieve commonly used in the industry. It has a wide range of applications and is suitable for medium and fine crushing pre- and inspection screening. According to the characteristics of the movement of the screen frame, it can be divided into two types: circular motion vibration sieve and linear vibration motion sieve. The former includes a single-axis inertial vibrating screen, a self-centering vibrating screen and a heavy-duty vibrating screen; the latter includes a two-axis inertial vibrating screen and a resonant screen, which can be classified into a single-layer sieve and a double-layer sieve according to the number of sieve layers.
3, self-centering vibrating screen
The self-centering vibrating screen is suitable for screening medium and fine grain materials in large and medium-sized plants. The model of the domestic self-centering sieve is SZZ, which is divided into SZZ1 (single layer) and SZZ2 (double layer) according to the number of sieve layers. It is usually a hanging screen, but it also has a seat screen.
4, heavy vibrating screen
The principle of the heavy-duty vibrating screen is similar to that of the self-centering vibrating screen, but the main shaft of the vibrator is not eccentric at all, and the shaft hole of the pulley is eccentric to achieve the purpose of self-centering during operation. The heavy-duty vibrating screen is relatively strong and can withstand large impact loads. It is suitable for screening large-sized and relatively dense materials. The maximum feeding capacity is up to 350mm. It is mainly used for pre-screening of medium-cropped pre-separation. In addition, for materials with high water content and high mud content, it can be pre-screened and washed before being crushed, and the sieved material is put into the crusher, and the sieved material enters the washing and removing. Mud system.
5, resonance sieve
Resonant screen is also called elastic link type vibrating screen. It has large amplitude, high screening efficiency, large processing capacity, low power consumption and compact structure. However, the manufacturing process is complicated, the machine quality is large, the amplitude is difficult to stabilize, the adjustment is complicated, and the rubber spring is prone to aging.
6, linear vibrating screen
The linear vibrating screen has large vibration force, large amplitude, strong vibration, high screening efficiency and high productivity, and can screen coarse materials. Since the horizontal installation, the installation height is small, a linear reciprocating motion, for dehydration, removal of mud and heavy medium separation medium is advantageous. However, the structure is relatively complicated, and the rotation speed of the two shafts is high, so the manufacturing and lubrication requirements are high, and the vibration is not easily adjusted.
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