The simplest Vibrating Screen Working Principle can be explained using the single deck screen and put it onto an inclined frame The frame is mounted on springs The vibration is generated from an unbalanced flywheel A very erratic motion is developed when this wheel is rotated You will find these simple screens in smaller operations and rock quarries where sizing isn8217t as critical As the performance of this type of screen isn8217t good enough to meet the requirements of most mining operations two variations of this screen has been developed.
In the majority of cases the types of screen decks that you will be operating will be either the horizontal screen or the inclined vibrating screen The names of these screens do not reflect the angle that the screens are on they reflect the direction of the motion that is creating the vibration.
The pattern of vibration for the horizontal screen deck is back and forth while the inclined vibrating screen is circular There are different ways to generate the vibration itself A double counterbalance system is used in the horizontal screen.
The counterbalance weight will alternately promote and retard the direction of vibration depending upon where within each revolution the weights come opposite each other.
The reason for using two decks is to increase the surface area that the ore has to come into contact with The top deck will have bigger holes in the grid of the screen The size of the ore that it will be removed will be larger than that on the bottom Only the small rock that is able to pass through the bottom screen will be removed from the circuit In most cases the large rock that was on top of each screen will be mixed back together again.
In plant design it is usual to install a screen ahead of the secondary crusher to bypass any ore which has already been crushed small enough and so to relieve it of unnecessary work Very close screening is not required and some sort of moving bar or ring grizzly can well be used but the modern method is to employ for the purpose a heavy duty vibrating screen of the Hummer type which has no external moving parts to wear out the vibrator is totally enclosed and the only part subjected to wear is the surface of the screen.
The Type 70 Screen is usually made 4 ft wide and from 5 to 10 ft in length For the rough work described above it can be relied upon to give a capacity of 4 to 5 tons per square foot when screening to about in and set at a slope of 25 to 30 degrees to the horizontal The Type 50 Vibrator requires about 2 h p for its operation.
The determination of screen capacity is a very complex subject There is a lot of theory on the subject that has been developed over many years of the manufacture of screens and much study of the results of their use However it is still necessary to test the results of a new installation to be reasonably certain of the screen capacity.
A general rule of thumb for good screening is that The bed depth of material at the discharge end of a screen should never be over four times the size opening in the screen surface for material weighing 100 pounds per cubic foot or three times for material weighing 50 pounds per cubic foot The feed end depth can be greater particularly if the feed contains a large percentage of fines Other interrelated factors are.
Classification screens vibration processing line vibration dehydration screen classification for copper in dewatering screen gaofu sieving dewatering screen also known as high frequency dewatering vibrating screen which widely used in tailings dry line washed sand slime dehydration soil force pulp water through the screen to become the undersize material and fine material is blocked by the.
Vibramech Footprint Vibramech has an installed base of over 8 000 pieces of mineral processing equipment worldwide We have supplied vibrating mineral processing machines extensively throughout Africa and have equipment installed in amongst other regions Russia Kazakhstan China Canada USA South America Australia India United Kingdom and the Philippines.
With a complete range of modular screen panels for mineral processing Multotec ensures your screen deck is optimised to achieve your required cut size efficiently reliably and over an extended service life Our compression and injection moulded rubber polyurethane wedge wire ceramic steel and trommel screens are used in plants across the world processing a range of minerals from coal.
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