The vibrating screen is a large-displacement, multi-purpose screening equipment, so do you know the working principle of the vibrating screen? What are its characteristics?
When the vibrating screen is working, the two motors synchronously and reversely rotate to cause the exciter to generate a reverse excitation force, forcing the screen body to drive the screen to move longitudinally, so that the material on it is periodically thrown forward by the excitation force. So as to complete the material screening operation. It is suitable for screening sand and gravel materials in quarries, and can also be used in coal preparation, mineral processing, building materials, electric power and chemical industries.
Working characteristics of vibrating screen:
1. Adopt block eccentricity as exciting force, strong exciting force.
2. The screen beam and screen box adopt high-strength bolts, with simple structure and convenient and quick maintenance;
3. Using tire coupling, flexible connection, stable operation;
4. The structure of small amplitude, high frequency and large angle of inclination makes this machine high in screening efficiency, large in processing, long in life, low in power consumption and low in noise.
According to the structure and working principle of the screening machine, there are roughly the following categories:
1. The working part of the fixed screen is fixed, and the material is screened by sliding along the working surface. Fixed grid sieve is one of the most widely used in concentrators, generally used for pre-screening before coarse or medium crushing. It has a simple structure and is convenient to manufacture. It does not consume power and can directly unload the ore onto the screen surface. The main disadvantages are low productivity and low screening efficiency, generally only 50-60%.
2. Roller screen The working surface is composed of horizontally arranged rolling shafts. There are plates on the shafts, and fine-grained materials pass through the gaps between the rollers or plates. The bulk material is driven by the roller to move to one end and is discharged from the end. Concentrators generally rarely use this kind of sieve.
3. Cylindrical sieve The working part is cylindrical, and the entire sieve revolves around the axis of the cylinder, and the axis is generally installed at a small inclination. Materials are fed in from one end of the cylinder, fine materials pass through the sieve holes of the cylindrical working surface, and coarse materials are discharged from the other end of the cylinder. The rotating speed of the cylindrical screen is very low, the work is stable, and the power is well balanced. However, the sieve holes are easily blocked, the screening efficiency is low, the working area is small, and the productivity is low. Concentrators rarely use it as screening equipment.
4. Plane motion 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. Shaking screens and vibrating screens fall into this category.