There are many kinds of vibrating screens, which can be divided into circular vibrating screen and linear screen according to the movement track of materials. These two kinds of screening equipment are widely used in the ordinary production process of sand and gravel factories. In the field of mining and crushing, circular vibrating screen is widely used. In the actual production process, the selection of circular vibrating screen or linear screen depends on the types of materials handled by customers and industrial applications. The screening effect is different, and the selected machinery and equipment are also different. There is no essential difference in style and structure between circular vibrating screen and linear screen. Materials are screened according to the vibration of screen surface, but various differences in vibration trajectories will affect the screening effect.
Working principle
The motor is driven by the triangle belt to make the eccentric block of the exciter run at a high speed, generate a very 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 production process of meeting the materials with the screen surface, the particles smaller than the screen hole are sieved through, so as to realize classification.
The vibration motor is used as the vibration source to make the materials be thrown up on the screen, and at the same time, the materials move forward in a uniform straight line at a uniform speed. The materials are evenly fed from the conveyor to the feed inlet of the screen machine, and several specifications of above screen and below screen are generated according to the multi-layer screen, which are discharged from their respective outlets.
There is no essential difference between the style of circular vibrating screen and linear screen. The screening effect is achieved by the uniform linear motion of materials formed by the vibration of screen surface. However, the different vibration trajectories will affect the screening effect, so the customer’s selection is very critical, so the customer should know more about these two kinds of machinery and equipment to avoid losses caused by incorrect selection.
The circular vibrating screen achieves the screening effect through the exciting force generated by the vibration exciter driven by the ordinary motor through the soft connection. The circular vibrating screen makes the materials move in a parabolic circular track on the screen surface, so that the materials are dispersed as much as possible, which improves the bouncing force of the materials and reduces the hole plugging problem. The circular vibrating screen is mainly used in mining, coal Quarries and other mining fields are most widely used. Because the material moves on the screen surface for a longer time, the inclination angle between the screen surface and the ground of the circular vibrating screen is larger than that of the straight-line screen. The purpose is to improve the screening efficiency of the material, and only increase the inclination angle of the screen surface on the premise of not affecting the screening accuracy as far as possible. Therefore, the circular vibrating screen will not be too strict in the screening accuracy Generally, the plate used in the manufacture of circular vibrating screen is thick, and the material selected for the box must be made of manganese steel in order to bear the impact of materials in the screening production process.
The linear screen is installed at the bottom of the machine body through two vibrating motors, which is just the opposite to the circular vibrating screen. Because the eccentric block of the vibrating motor is small, the vibration frequency should be higher, and the amplitude height of the material on the screen surface should be low, so the movement time of the material on the screen surface will be shorter, and there is almost no angle between the screen surface and the ground during manufacturing. Linear screen is mainly used to screen fine particles, light specific gravity and low hardness materials. It is generally used in the food, chemical, building materials and pharmaceutical industries Most of the materials used for the manufacture of linear screen are light plate or stainless steel plate, and there are great differences in weight, amplitude and efficiency compared with circular vibrating screen.
The key differences between the two are:
1. Motion track
The materials on the circular vibrating screen move in a circular motion, and the materials on the linear screen move forward in a uniform linear motion.
2. Vibration exciter
Circular vibrating screen is also called single shaft vibrating screen because the exciter is a shaft and works with inertia motor. Linear 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.
3. Hole plugging
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, thereby improving the bouncing force of the material, and the material stuck in the screen hole can also jump out, reducing the problem of hole plugging.
4. Installation layout
Because the inclination angle of the screen surface is small, the height of the screen is reduced, which is convenient for the process layout.
5. Inclination of screen surface
According to the particle size of the material, the circular vibrating screen can change the inclination of the screen surface, and then change the moving speed of the material along the screen surface, so as to improve the processing capacity of the screen machine. Generally, the inclination angle of the screen surface of the linear screen in production is small.
6. Selected material
Under normal circumstances, the plate used in the manufacture of circular vibrating screen is relatively thick, and the box is made of manganese steel in order to bear the impact of materials in the screening production process. The materials used in the manufacture of linear screen are mostly light plate or stainless steel plate.
7. Available fields
Circular vibrating screen is the key to screen materials with large proportion, large particles and high hardness. It is widely used in mining fields such as mines, coal, quarries and so on. The key of linear screen is to screen fine particles, materials with light specific gravity and low hardness, most of which are dry-type powder, fine particles or micro powder materials, which are generally widely used in the food, chemical, building materials and pharmaceutical industries.
8. Processing capacity
For the circular vibrating screen, because the exciter is arranged above the center of gravity of the screen box, the elliptical long shafts on both sides of the screen box form a lower splay, and the upper end of the elliptical long shaft at the feeding end faces the direction of discharge, 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 direction of discharge, which alleviates the movement speed of materials and helps the screening of difficult materials, and the circular arc screen surface improves the effective area of the screen machine, And then improve its processing capacity.
In addition, for difficult materials, the circular vibrating screen can reverse the main shaft, so that the direction of vibration is opposite to the direction of material movement, 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.
9. Environmental protection
The linear screen can adopt a fully enclosed structure without dust overflow, which is more conducive to protecting the ecological environment.
Post time: Jul-19-2022