Types Of screening equipment
Vibrating screen is equipment for separating material sizes. There are many types of vibrating screens, such as horizontal screen, inclined screen, MD vibratory screen, rotary screen, vibratory screen, high-frequency screen, grizzly screen, dewatering screen, and other industrial screens. What is the difference between these types of vibrating screens?
Vibratory screen is a rectangular single-, double-, and multi-layer, high-efficiency new screening equipment. Vibrating screen can be divided into inclined and horizontal screen. At present, the screens range in width from 4′-12′ to 8′-32′. The screen size is usually set to 2.5 times its length and width. The width of the sieve determines the maximum carrying capacity of the sieve plate, and the length of the sieve determines the overall efficiency of the sieve plate. The vibrating screen is generally composed of a vibrator, a screen box, a supporting or hanging device, a transmission device, and others.
Horizontal screens are named because they are designed to be horizontal. The work direction of the screen is parallel to the ground or has a slope of 0 to 5. It is a triple-shaft screen, which uses for fixed and portable production lines. Compared with the inclined screen, it is more accurate and effective to determine the size and separate materials. This is because the material is retained on the screen for a longer period of time, which allowing sufficient time for the sized material to fall off the screen. The screen has the advantages of simple structure, reliable performance, large screening capacity, and economical use. Its low power consumption and low maintenance cost, it is the simplest and most practical screening equipment in the quarry crusher plant.
Vibrating inclined screen is the most popular types of vibrating screens. The screen fix to the tilted frame at an angle of 15 to 30 degrees. The inclined screen is usually designed in a multi-layer structure and can be classified into 2-5 grades. And the screen can be adjusted to provide overall performance and efficiency. We can adjust the slope, speed, and direction according to the application.
The inclined screen consists of eight basic components, namely side wall, platform, screening medium, actuator, motor, motor console, spring, and the spring bracket. The key factor of inclined screen equipment is its weldless design. All the 8 basic screen parts are assembled by bolt and nut connections to prevent screen cracking and failure due to welding.
MD vibratory screen
MD vibrating screen is a compact, high capacity dry screen. It widely used in industries of dry sand, fertilizer, iron ore, wood chips, limestone, and others. It can screen more tons per hour. Compare with the traditional screening equipment, its processing capacity is bigger. Because of its excellent design, it takes up less space and reduces the size of the screen layer by layer. As a result, it can screen out products of many different sizes at the same time.
The trommel screen uses continuous rolling and lifting motions to screen and separate raw materials. These materials include municipal waste, recycling, industry, aggregates, and mining. This screen is a kind of machine which is widely used in separation technology. By the size of the particle size to control the screening. The barrel of the screen is generally divided into several sections which depending on the specific circumstances. The screen holes from small to large arrangements, each section on the same size as the screen hole. The screening equipment features: screen hole is not easy to plug. The screen cylinder can be closed, easy to close the dust collection. Adopt Special Screen Mesh, high screening efficiency, and long service life.
As the cylinder of the rotating sieve rotates, the raw material is lifted from the shelf until it is near the top of the cylinder. Then, the material falls, landing on other material at the bottom of the drum. This operation helps to break down the softer parts as well as separate the different types of materials. As the tumbling continues, smaller fractions are filtered through holes in the sieve plate. While the larger material continues along the length of the cylinder, finally discharging.
High frequency screen
High-frequency screen with high efficiency, small amplitude, high screening frequency. It is effective equipment for screening and classification of fine-grained materials. It is widely used in screening and classification of iron ore, tin, tungsten, tantalum, and niobium. For the high-frequency screen, it is solely for the purpose of dehydration wet screening. Therefore, we hope to form a filtering layer on the screen surface as soon as possible, so as to block the passage of fine coal. Thus reducing the loss of solid materials in water and improving the recovery rate of solid. If the screen surface amplitude is too large, it will destroy the filter layer. Wet screening doesn’t require large amplitudes.
High-frequency screen with high frequency can destroy the pulp surface tension and fine material in screen surface high-speed oscillation. This operation not only accelerates the density of useful minerals and segregation but also increases the probability of less than the size of the separation material in contact with the screen hole. Thus create a better separation condition which made the material smaller than the separation granularity. In particular, a large density of material and pulp together through the screen hole sieve out. It can provide higher capacity and more efficient dimensions than traditional screening devices.
Grizzly screen is universal screen equipment with special screen surface. Its biggest characteristic lies in its high screening efficiency, large relative processing capacity and not easy to plug holes. Especially suitable for high moisture, viscous material screening. It is widely used in the coal mine, chemical industry, metallurgy, electric power, building materials, and other industries that the medium-sized granular material classification. The advantages of the grizzly screens are a simple structure, convenient maintenance, high strength, impact resistance, wear resistance, low noise and so on.
Working principle: Grizzly screen is composed of many bars. Screen surface and horizontal composition of an angle. When screening ore dip angle is 40 ~ 45. When screening wet material dip angle increases 5 ~ 10. The material is fed through the upper end of the screen. The ore block larger than the size of the screen hole slides automatically along the screen surface. The ore block smaller than the size of the screen hole falls through the screen hole.
Dewatering screen is the main role of dewatering, desliming, desilting medium. It is used for sand washing plants, coal slime recovery in the coal preparation plants, tailings dry discharge in the mineral processing plants, etc. Therefore, it is also called sand dewatering screen, mine dewatering screen, slime dewatering screen, tailings dry drainage screen, high-frequency dewatering screen, etc.
The screen Mesh adopts super high molecular polyurethane material, impact resistance, corrosion resistance, wear resistance. The screen box is made of stainless steel. The screening machine is especially suitable for treating fine-grained minerals. It can also be used in combination with a cyclone. Dewatering efficiency is very high and widely used in tailings dry discharge, dewatering, and other operations.
Other types of vibrating screens
Laboratory screen, industrial screens, fine screen, linear screen, elliptical screen，banana screen, gravel screen, aggregate screen, sand screen, etc.