There are many classifications of vibrating screens, which can be divided into circular vibrating screens and linear screens according to the movement trajectory of materials. These two categories are commonly used screening equipment in daily production. Today we come to understand the difference between the two.
The motor drives the eccentric block of the vibration exciter through the V-belt to produce high-speed rotation, which produces a large centrifugal inertia force and stimulates the screen box to produce a circular motion with certain amplitude. The material on the screen is subjected to the impulse transmitted by the screen box on the inclined screen surface to produce continuous throwing motion. When the material meets the screen surface, the particles smaller than the sieve hole are passed through the screen to realize classification.
The vibration motor is used as the source of vibration so that the material is thrown up on the screen while moving forward in a straight line. The materials evenly enter the inlet of the screening machine from the feeder and pass through the multi-layer screen to produce several specifications of over sieve and underserved, which are respectively discharged from their respective outlets.
The material on the circular vibrating screen moves in a circular motion, and the material on the linear screen moves forward in a straight line.
The circular vibrating screen is also called a single-shaft vibrating screen because the exciter is a shaft and uses an inertial motor to work. The linear vibrating screen vibrator is composed of two shafts and works by the principle of vibration motor excitation, so it is also called a double-shaft vibrating screen.
The material of the circular vibrating screen moves in a parabolic circular trajectory on the screen surface so that the material is dispersed as much as possible to improve the bounce force of the material, and the material stuck in the screen hole can also jump out, reducing the hole blocking phenomenon.
Due to the small inclination angle of the screen surface of the linear vibrating screen, the height of the screen is reduced, which is convenient for process layout.
According to the particle size of the material, the circular vibrating screen can change the inclination of the screen surface, thereby changing the moving speed of the material along the screen surface and increasing the processing capacity of the screen machine. Generally speaking, the inclination angle of the screen surface of the linear vibrating screen in production is relatively small.
Under normal circumstances, the circular vibrating screen is made of thicker plates, and the box is made of manganese steel to resist the impact of materials during the screening process. The materials used for the production of linear vibrating screens are mainly light plates or stainless steel plates.
The circular vibrating screen mainly screens materials with high specific gravity, large particles, and high hardness. It is widely used in mines, coal, quarries, and other mining industries. The linear screen mainly screens fine particles, light-specific gravity, and low hardness materials. It is mainly dry powder, fine granular or micro powder materials, which are usually widely used in the food, chemical, building materials, and pharmaceutical industries.
For the circular vibrating screen, because the exciter is arranged above the center of gravity of the screen box, the elliptical long axis at both ends of the screen box is in a lower eight shape, and the upper end of the elliptical long axis at the feeding end faces the discharge direction, which is conducive to rapid material spread. The upper end of the elliptical long axis of the discharge end is opposite to the discharge direction, reducing the movement speed of the material, which is conducive to the penetration of difficult-to-screen materials, and the arc-shaped screen surface increases the effective area of the screen, thereby improving its processing capacity.
The linear vibrating screen can adopt a fully enclosed structure without dust spillage, which is more conducive to environmental protection.
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