1

CRUSHERS

2

CONTENTS Introduction

Types of Crushing (Primary, Secondary, Tertiary)

Flowsheet for crushing plant

Open circuit & Close circuit crushing

Jaw Crusher (Introduction, Types, Construction, Rating),

Gyratory Crusher (Introduction, Rating, Construction),

Comparison of Gyratory & Jaw Crushers

Cone Crushers (Introduction, Types, Construction, Parameters),

Roll Crusher (Introduction, Types, Parameters, Surface),

Impact Crushers (Introduction, Construction, Parameters, Types),

Rotary Coal Breaker

3

Introduction & Types of Crushing

4

What is crushing?

Main objectives of crushing

Types of Crushing

Primary Crushing

Secondary Crushing

Tertiary Crushing

5

6

PRIMARY CRUSHERS

7

Introduction to Jaw Crusher

8

What is a Jaw Crusher?

Types of Jaw Crusher

Main types

Blake type

Double toggle Blake type

Single toggle Blake type

Dodge type

Universal type

9

Double toggle Blake type

10

11

12

Single Toggle Blake Type

13

14

Comparison B/t

Double Toggle & Single Toggle

Parameters

Type of motion

Capacity

Wear

Maintenance cost

Capital cost

Nature of material

15

Free crushing & choked crushing

16

Jaw Crusher Construction

17

Main Frame (in sections)

Jaws & Liners

Cheek Plates

Characteristics of Jaw Crusher

18

Angle b/w jaws

Speed

Throw

Set

Safety Spring

Capacity

Energy requirements

Reduction ratio

Drawbacks of Jaw Crusher

19

180 degree machine

Not suitable for stick Material

Lumps passes without crushing

Applications of Jaw Crusher

20

21

Gyratory Crusher

22

Introduction, Construction & Working

23

24

Characteristics

25

360 degree machine

Much higher capacity than jaw crusher

Crusher size

Power consumption

Feeding mechanism

Use of grizzlies ahead of crusher

Choking

Comparison b/w Jaw & Gyratory

26

Size of ore

Capacity required

Capacity formulas

Capital and maintenance costs

Size of the machine

Foundations

Feeding mechanism

Sectioning

Type of the material being crushed

27

SECONDARY CRUSHERS

28

CONE CRUSHER

29

Introduction

30

Characteristics of Cone Crusher

31

Throw

High speed action

Parallel section b/w liners at discharge

Distributing plate

Set

32

ROLL CRUSHER

Introduction & Mode of Operation

33

Types of Roll Crushers

34

Single Roll type

Double Roll type

Three Roll Type

Four Roll Type

35

36

Parameters affecting performance

37

Angle of nip

Speed of roll

Size of roll

Capacity of roll crusher

38

Surface of Roll Crusher

39

40

IMPACT CRUSHER

Introduction & Mode of Operation

41

42

Applications of Impact Crushers

43

Stress-free stone production for brick making, building &

road making

Used in quarrying operation for crushing plastic material

Produce cubical product

Construction & Working

44

45

Parameters of Impact Crushers

46

Weight of hammer

Speed of rotor

Nature of feed

Reduction Ratio

Types of Hammer Mill

47

Fixed Hammer Mill

Rotary Hammer Mill

48

49

50