Structure and working principle of screening machinery

Structure and working principle of screening machinery

Xinxiang Oudexin Filter Co., Ltd.           Date:2020-03-14

 

The structure and working principle of screening machinery are roughly the following categories:
1. Fixed screen The working part is fixed, and the material is screened by sliding the material along the working surface. Fixed grid sieve is one of the most widely used in ore dressing plants, and is generally used for pre-screening before coarse or medium crushing. It has a simple structure and is easy to manufacture. Without power consumption, the ore can be unloaded directly onto the screen. The main disadvantages are low productivity and low screening efficiency, generally only 50-60%.
2. Roller screen The working surface is composed of a series of rolling shafts arranged horizontally. There are plates on the shaft, and the fine-grained materials pass through the gap between the rollers or the plates. Large pieces of material are moved to one end by the roller and discharged from the end. Concentrators rarely use such screens.
3. Circular vibrating screen The working part is cylindrical, and the whole screen rotates around the axis of the cylinder. The axis is generally installed with a small inclination angle. The material is fed from one end of the cylinder, fine grade material passes through the sieve holes of the cylindrical working surface, and coarse-grained material is discharged from the other end of the cylinder.
The rotating speed of the circular vibrating screen is very low, the work is stable, and the power balance is good. However, the sieve openings are easy to plug, the screening efficiency is low, the working area is small, and the productivity is low. Concentrators rarely use it as screening equipment.
4. Plane moving screen The body is swinging or vibrating in a plane. According to its plane motion trajectory, it is divided into linear motion, circular motion, elliptical motion and complex motion. Swing screens and shakers fall into this category.
 
The swinging screen uses the crank link mechanism as the transmission part. The motor drives the eccentric shaft to rotate through the belt and the pulley, and makes the body reciprocate in a certain direction by the connecting rod. The movement direction of the machine body is perpendicular to the center line of the support rod or suspension rod. Due to the swinging movement of the machine body, the material on the screen surface moves to the discharge end at a certain speed, and the material is screened at the same time.
 
Compared with the above-mentioned sieves, the swinging sieve has higher productivity and screening efficiency. Its disadvantage is poor dynamic balance.
Vibrating screens are most commonly used in mining plants. According to their transmission mechanisms, they can be divided into the following types: eccentric vibrating screen, inertial vibrating screen, self-centering vibrating screen, and resonance screen.

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