There are many classifications of vibrating screen. According to the movement track of materials, they can be divided into circular vibrating screen and linear screen. These two types are commonly used screening equipment in daily production. A few days ago, a user asked about their differences and wanted to know how to choose. Today, Fodamon engineer will compare them to see the differences between the two.
Classification of vibrating screen
There is no essential difference in style and structural composition between circular vibrating screen and linear vibrating screen. Materials are screened through screen surface vibration, but different vibration trajectories will directly affect the purpose of screening.
Working principle of vibrating screen
A. Circular vibrating screen
The motor is driven by the triangular belt to make the eccentric block of the vibration exciter rotate at a high speed, generate a large centrifugal inertia force, and stimulate the screen box to produce a circular motion with a certain amplitude. The materials on the screen are subjected to the impulse transmitted by the screen box on the inclined screen surface to produce a continuous throwing motion. In the process of meeting the materials with the screen surface, the particles smaller than the screen hole are screened through, so as to realize classification.
B. Linear vibrating screen
The vibration motor is used as the vibration source to make the materials be thrown up on the screen and move forward in a straight line at the same time. The materials evenly enter the feed inlet of the screening machine from the feeder, and several specifications of above and below the screen are generated through the multi-layer screen and discharged from their respective outlets.
Difference and comparison between circular vibrating screen and linear vibrating screen
A. Trajectory
The material on the circular vibrating screen moves circularly, and the material on the linear screen moves forward in a straight line.
B. Vibration exciter
Circular vibrating screen is also called single shaft vibrating screen because the exciter is a shaft and works with inertial motor. Linear vibrating screen exciter is composed of two shafts and works with the principle of vibration motor excitation, so it is also called double shaft vibrating screen.
C. Hole plugging
The materials of the circular vibrating screen move in a parabolic circular track on the screen surface to disperse the materials as much as possible, so as to improve the material bouncing force, and the materials stuck in the screen hole can also jump out, reducing the hole blocking phenomenon.
D. Installation layout
Due to the small inclination angle of the screen surface, the height of the screen is reduced, which is convenient for process layout.
E. Screen surface inclination
According to the particle size of the material, the circular vibrating screen can change the inclination of the screen surface, so as to change the moving speed of the material along the screen surface and improve the processing capacity of the screen machine. Generally speaking, the screen surface inclination of linear vibrating screen is small in production.
F. Material
Generally, the plate used in the production of circular vibrating screen is thick, and the box is made of manganese steel to resist the impact of materials in the screening process. The active material of linear vibrating screen is mainly light plate or stainless steel plate.
G. Applicable fields
Circular vibrating screen is mainly used to screen materials with large ratio, large particles and high hardness. It is widely used in mining industries such as mines, coal and quarries.
Linear screen is mainly used to screen fine particles, materials with light specific gravity and low hardness, mainly dry powder, fine particles or micro powder materials. It is usually widely used in food, chemical, building materials and pharmaceutical industries.
H. Processing capacity
For the circular vibrating screen, since the exciter is arranged above the center of gravity of the screen box, the elliptical long shafts at both ends of the screen box form a lower octagon, and the upper end of the elliptical long shaft at the feeding end faces the discharge direction, which is conducive to the rapid dispersion of materials, while the upper end of the elliptical long shaft at the discharge end is against the discharge direction, which reduces the movement speed of materials and is conducive to the screening of difficult materials, The circular arc screen surface increases the effective area of the screen machine, so as to improve its processing capacity.
In addition, for difficult to screen materials, the circular vibrating screen can turn the main shaft, so that the vibration direction is opposite to the material movement direction, and the movement speed of materials along the screen surface is reduced (when the inclination angle of the screen surface is the same as the rotation speed of the main shaft), so as to improve the screening efficiency.
I. Environmental protection
The linear vibrating screen can adopt a fully enclosed structure without dust overflow, which is more conducive to environmental protection.
Circular vibrating screen is widely used in the field of mine crushing. In actual production, the selection of circular vibrating screen or linear vibrating screen mainly depends on the material type and application field handled by users. Different screening purposes lead to different equipment selection.