Slide 1

Equipments of mechanical operations

SANIA

13001005040

2ND YEAR

CONTENTS

Jaw crusher

Roll crusher

Ball mill

Screening

Cyclone separator

Sedimentation

Conveyors

Jaw Crusher

A jaw crusher consist of a set of two jaws ,set to form a V open at the top. one jaw is fixed and the other one is swinging, reciprocates in horizontal direction by a cam. The material is crushed progressively smaller as it travels downward until it is small enough to escape from the bottom opening. The greater amount of motion is at the bottom of the V.

ROLL CRUSHER

Two heavy smooth faced rolls turning on parallel horizontal axes are the working element of the smooth roll crusher. particles of feed caught between the rolls are broken in compression and drop out below. The rolls turn to each other with the same speed and have through large in diameter, so that they can nip moderately large lumps. It produces few fine pieces.

BALL MILL

A ball mill is a cylindrical device used in grinding dry solids. Ball mills rotate around a horizontal axis, partially filled with the material to b ground plus the grinding medium. The faster the mill is rotated, the farther the balls are carried up inside the mill. The shell is usually steel lined with high carbon steel plate and grinding medium can be ceramic balls and stainless steel balls. The balls, while in contact with the walls do some grinding by slipping and rolling over each other, but most of the grinding occurs at the zone of impact, where the free falling balls strike the bottom of the mill.

SCREENING

Screening is a method of separating particles according to size. Screens are open containers with uniformly spaced openings at the base; of various mesh sizes are arranged in a stake in order of increasing mesh number from top to bottom. Screening is done wet occasionally but more commonly dry. Screens are made from woven metal wire, silk or plastic cloth.

Cyclone separator

Cyclone separator also called dust settling chambers utilizes centrifugal forces for separation of solid or liquid particles from a steam of fluid. The cyclone movement given to the dust particles tends to move the particles towards the wall from which they are directed towards a solid particles collecting receiver kept at the bottom.

conveyor

Bucket conveyorBelt conveyorChain conveyorScrew conveyor

Bucket conveyor

They are also called bucket elevators. In a bucket conveyor buckets are attached to a cable ,chain or belt are automatically unloaded at the end of the conveyor run.

Belt conveyor

Belt conveyor consist of two or more pulleys, with a continuous loop of material and the conveyor belt that rotates about them. One or both of the pulleys are powered, moving the belt and the material on the belt forward.

Screw conveyor

They are used in many bulk handing industries .they usually consist of a spiral coiled around a shaft.

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