The document explains various mechanical reduction methods in crushing, highlighting impact, compression, shear, and attrition as primary mechanisms. It details different types of crushers, such as jaw crushers, gyratory crushers, and hammer crushers, along with their applications and operational mechanics. The comparative analysis includes capacity, reduction ratios, and suitability for different materials, portraying the complexity of the crushing process.

1. Crusher part I

2. Mechanical Reduction Methods
Impact Attrition
Shear Compression

3. In crushing terminology, impact refers to the sharp,
instantaneous collision of one moving object against
another.
Impact:

4.  As the name implies, crushing by compression is done
between two surfaces, with the work being done by one or
both surfaces.
 Jaw crushers using this method of compression are suitable for
reducing extremely hard and abrasive rock.
Compression:

5.  Shear consists of a trimming or cleaving action rather than the
rubbing action associated with attrition.
 Shear is usually combined with other methods.
 For example, single-roll crushers employ shear together with
impact and compression.
Shear:

6.  Attrition is a term applied to the reduction of materials by
scrubbing it between two hard surfaces.
 Hammer crushers operate with close clearances between the
hammers and the screen bars,
 and they reduce by attrition combined with shear and impact
reduction.
 Though attrition consumes more power and increases wear on
hammers and screen bars,
 it is practical for crushing less abrasive
materials such as pure limestone and coal.
Attrition:

7. Types of Crushers

8. Crusher
Compression
Impact
Impact Hammer Jaw
Roller Gyratory
Continuously
Working Machines
Intermittently
Working Machines

9. Jaw Crusher
TOGGLE CRUSHER

10. Jaw Crusher
TOGGLE CRUSHER

11. TOGGLE CRUSHER
Jaw Crusher

12. Single Toggle Jaw Crusher

13. TOGGLE CRUSHER
IN MOTION
Jaw Crusher

14. Double Toggle Jaw Crusher
A: Swing jaw
B: Stationary jaw
C: Pivot point
D: Double set of toggles
E: Offset eccentric shaft

15. Double Toggle Jaw Crusher

16. Double Toggle Jaw Crusher

17. Offset eccentric shaft

18. Function Compressive action
Action Intermittent
Reduction ratio 6:1 to 8:1
Capacity Low capacity ≈ 300 T/H
Application Primary crusher for very hard abrasive
materials of low moisture content .
single toggle crusher is better for inclusion of stick
materials but, higher wear than the double toggle.
Jaw crusher highlights

19. Cone Crusher
(GYRATORY)

20. (GYRATORY)
Cone Crusher

21. Cone Crusher

22. Gyratory Crusher

23. Crushing Action of a Gyratory Crusher

25. Gyratory crusher highlights
Function Compressive action
Action Intermittent
Reduction 12:1 to 15:1
Capacity 6000 T/H
Application Primary crusher for very hard abrasive
material of low moisture

26. Single Roller Crusher

27. Double Roller Crusher

28. Double Roller Crusher

29. Double Roller Crusher

30. 3D View -Double Roller Crusher

31. Hammer Crusher

32. Hammer
Crushers
WITH FEED
ROLLERS

34. Hammer Crusher

35. Hammer Crusher

36. Hammer
Crusher

39. Twin-
rotor
hammer
crusher
Titan
( O & K)

40. Twin-rotor
hammer
crusher
type Titan
( O. & K.)

41. Rotor

42. Hammers
Different shapes

43. Screen /
Grids

44. Hammers

45. Grizzly with elliptical rotating rollers

46. Mogensen sizer
(illustration of its principle)

47. FOR
CHANGING
WORN
PARTS
Auxiliary Equipment

48. Impact Crushers
Impact Crusher
Compound

49. Hammer Crusher Highlights
Function : Impact & percussive action
Action : Continues
Reduction ratio : 50:1
Capacity : 2000 t/h for the double rotor
Application : Primary reduction of medium hard
to hard material

50. Single Rotor
Impact
Crusher

51. Single Rotor
Impact Crusher

52. Compound Impact Crusher
“HAZEMAG”

53. Single Impeller crushed-breaker plates
& Breaker bars

54. Impact action of a double Impeller impact

55. Double Impeller Impact Crusher with Housing

56. Impact Crusher Highlights
Function Impact surface
Action Continues
Reduction ratio
single 6:1 and 20:1
compound 60:1
Capacity 1500T/h
Application Suited for brittle hard and medium
hard material, the single rotor used as
primary crusher only .