The working principle of multi-layer SZZ vibrating screen

[BONOVO]

The working part of the mine vibrating screen is fixed, and the material is screened by sliding along the mine vibrating screen face. Fixed screen is one of the most widely used in mining plants, which is generally used for pre-screening before coarse or medium crushing. It is simple in structure and convenient in manufacture. Without power consumption, the ore can be unloaded directly to the screen surface. The main disadvantage is low productivity and low screening efficiency, generally only 50-60%.

The working face is composed of a rolling shaft arranged horizontally by the mine vibrating screen, and there are plates on the shaft, and fine materials pass through the gap between the rollers or plates. The bulk material is driven to one end by a roller and discharged from the end. These sieves are rarely used in mines.

The working part of the mine vibrating screen is divided into cylindrical shape, and the whole screen rotates around the axis of the cylinder body, and the axis is installed into a small inclination Angle under normal circumstances. The material is fed from one end of the cylinder, the fine grade material is passed through the sieve on the cylindrical working surface, and the coarse grain material is discharged from the other end of the cylinder. The rotating speed of the cylinder screen is very low, the work is stable, and the power balance is good. But its sieve hole is easy to plug, low screening efficiency, small working area, low productivity. It is rarely used as screening equipment in mines.

The body is oscillating or vibrating in a plane. According to its plane motion trajectory, it can be divided into linear motion, circular motion, elliptical motion and complex motion. Drum screen, cylinder screen and vibrating screen belong to this category.

When the mine vibrating screen works, the two motors are placed synchronously in reverse so that the shaker generates reverse exciting force, forcing the mine vibrating screen body to drive the screen to do longitudinal motion, so that the material on it is periodically thrown forward a range by the excited force, so as to complete the material screening operation. mine vibrating screen is driven by a crank connecting rod mechanism. The motor drives the eccentric shaft to turn through the belt and pulley, and makes the body reciprocate in a certain direction through the connecting rod.

The movement direction of the vibrating screen body is perpendicular to the center line of the support rod or suspension rod. Due to the swinging movement of the 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 sieve, the mine vibrating screen has higher productivity and screening efficiency. Its disadvantage is poor dynamic balance. It is now rarely used in mining plants, and has been replaced by more reasonable cylindrical screens.

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