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ATTACHMENT Tabel 2. Description Screen Used in FactoryNOKIND OF SCREENHOW IT WORKADVANTAGES & DISADVATAGESPICTURE

1SCREEN Trommel Trommel Screen is a screening tool which is used in large -scale industry especially in mining . This is one of the oldest screening device , which is a cylindrical sieve rotate usually between 35 and 45 % of critical speed . This is kind of sieve rolling .Trommels can handle materials from 55 mm to 6 mm , and smaller sizes can be handled in conditions of wet screening .Trommel Screen is shaped like a large tube , wherein the tube have holes .

Trommel Screen consists of input and output , which feeds into the input .

In the input , the feed to the screen is rotated by a specified speed .

Feed unwanted will come out by itself through the hole through output .

Desired feed will enter the reservoir / storage then flowed through beltconveyor .

Feed is no entry / escape or at reycle .Advantages

price is cheaper than vibrating screen

Disadvantages

- cost care , especially in the motor armature and brushes can not produce a uniform product such as the Vibrating .

- Need a place / room is relatively large

2Grizzly Screen

is a kind of static sieves , where the material to be sieved to follow the flow on slope certain positionUsed to very coarse material . Consists of a series of parallel heavy bar attached to a frame , some use replacement bars and chains as there are shaken or vibrated mechanically for sizing or assist in the removal of oversize oreBait is very rough , fall on the upper end of the lattice . A large chunk will roll to the end and a small chunk will fall down into the collector. distance between each bar at the top is made wide enough to be strong compared to the bottom without blockage by chunks which only partially escaped . The distance between the rods ranged 2-8 inch .

3Vibrating screen Vibrating screen , sieve surface dynamic horizontal and oblique move in frequencies 1000 to 7000 Hz . This type of sieve have high capacity , with good separation efficiency , which is used for a wide range of particle sizes . Vibrating screen can be referred to as ( Sifter shakes ) generally works for separating solids contained in oil rough ( dirt crude oil) in a way sifted / shakes in the filter media with a certain measure of mess (according need ) .

working principle of vibrating screen is actually very simple .

Basically the working principle of vibrating screen is a screening process by vibrating .

we often called sifting screen and vibrating the screen in the shape.

Vibrating there were circular and square -shaped , but in general the form of a circle is more often used as more of the market .

Vibrating screen is recommended 2 level filtering with mesh size 30 on top and 40 bottom mesh .

With such a measure would facilitate screening in strainner brush .

4Oscillating screen , dynamic sieve in frequency lower than vibrating screen (100-400 Hz ) with longer time. Oscillating typically used to hold a small -sized material yangmengalir free , measuring thin , dusty , and other materials that are difficult to treat with Carabias , ie to the smaller size of 4mesh .

Material inserted from above the hole and then the oscillator will spin small particles will filtered and fall down through the hole while the big particel will not be filtered . These results are then milled inserted into vibrating screener and undergo a process of sifting .

5Reciprocating screen, dynamic sieves with swing movement, punch length (20-200 Hz).

Used for the removal of the separation size.

This separation is used for :

Material

Material is smooth, dry

Small size (light) which is about 10 to 20 lm, and sometimes up to 40 lm.Consists of a reciprocating Screens: Gyratory horizontal moving at the end of the dariscreen bait perpendicular to the aid of a rotating shaft in an irregular manner. Rotation of the shaft of 1000 rev / min. The twist at the end of the feed materials quickly spread to the entire transverse width of the screen surface. This twist also arrange these materials based on the difference mesh. During these materials across the surface of the screen, there will be reduction in the number of end termination (end device). Reduction helps separate the materials termed 'near mesh particles'.

6Shaking screen

It is a tool used to spesifikasik size of the metal ore that we will process before being put into bins (storage)Using the principle of reciprocating movement (shake) who worked on the system tilt

Operates in the number of strokes per minute 60 800 Decrease the size of