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Types and working principle of common screening machinery vibrating screen
Release time:2018-09-05 14:40 Number of clicks:
In industrial production, it is often necessary to divide various raw materials (such as ore, coal, stone, etc.) and various primary products (such as cement, salt, monosodium glutamate, etc.) into several grades according to the particle size of the material, or to divide the water therein. Removal of impurities, etc., for the next step of processing and improving product quality, which requires the use of screening machinery.
Vibrating screens are common screening machines and are used in a wide variety of applications in a wide range of industries. From mines to metallurgy, from building materials to electricity, from road-building bridges to food and chemical industry, vibrating screens are everywhere. It is no exaggeration to say that a qualified, high quality product cannot be produced without a vibrating screen.
The more commonly used vibrating screens include circular vibrating screens and linear vibrating screens. The circular trajectory of the sieve box (which can be found on the sieve body) is round or elliptical. Generally, the vibrator of a circular vibrating screen has only one shaft, so it is also called a single-axis vibrating screen. The circular vibrating screen is mainly used for the classification of materials of various sizes, generally inclined installation, with seat type and hanging type. It works reliably and has high screening efficiency.
The linear vibrating screen box moves in a straight line or close to a straight line. It has two axes, so it is also called a two-axis vibrating screen. The linear vibrating screen is installed horizontally or obliquely. This type of vibrating screen is compact and stable in operation. It is widely used for dehydration, de-mudging and de-intermediation of various materials, and also for dry and wet grading of medium and fine-grained materials. So how does the vibrating screen work? How does it screen the material?
We all have the experience that when the car turns, the body of the person sitting in the car leans to the other side of the turn, which is the centrifugal force. The vibrating screen is operated by an inertial vibrator made according to this principle.
People install an eccentric body on the shaft and use an electric motor (or other power machine) to drive it to rotate. At this time, the eccentric body generates an outward (relative to the axis) force (like the person sitting in the car) the quality of the eccentric body. The larger the distance from the axis, the higher the rotational speed of the shaft and the greater the centrifugal force. Unlike a car turn, this eccentric body does a circular motion, producing a continuous force in the circumferential direction. This is the vibrator (or exciter). By properly installing it in the appropriate position of the screen machine, it can drive the screen machine to make a circular motion, and a circular vibrating screen is produced.
Two such eccentric shafts are mounted side by side, so that they are synchronized (the initial positions of the eccentric bodies are the same) and reversely rotate at the same speed. At this time, the forces generated by the two eccentric bodies in the horizontal direction are equal in magnitude and opposite in direction, thus mutual Offset; the forces of equal magnitude and direction in the two directions are added together, which produces a linear motion, which is how the linear vibrating screen works.