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4.3 Stresses in a flywheel 34
4.4 Design calculations 38
4.5 Design of spring for tension bar 40
4.6 Final results and Discussion 41
References 43 Fig. No. Title Page No
1.1 Single toggle blake type jaw crusher 3
1.2 Double toggle blake type jaw crusher 4
1.3 Dodge Type Jaw crusher 5
1.4 Schematic Diagram of a jaw crusher 8
2.1 Equivalent four bar mechanism diagram 13
2.2 Graph: Crank angle v/s angle made by moving jaw with Y axis 15
2.3 Graph: X displacement v/s Y displacement at different crank angle 18
2.4 Graph: Crank angle v/s Horizontal displacement 18
2.5 Graph: Crank angle v/s Horizontal & vertical displacement of midpoint 19
2.6 Graph: X displacement v/s Y displacement of the midpoint. 19
2.7 Graph: Crank angle v/s Horizontal velocity 22
2.8 Graph: Crank angle v/s vertical velocity 22
2.9 Graph: Crank angle v/s velocity 23
2.10 Graph: Crank angle v/s Horizontal acceleration. 26
2.11 Graph: Crank angle v/s vertical acceleration 26
2.12 Graph: Crank angle v/s Acceleration 27
3.1 Particle fracture Mechanism 28
3.2 Fracture due to compression 28
3.2 Forces on particles inside jaw crusher. 29
4.1 Flywheel 33
4.2 Stress on a flywheel 34
4.3 Graph: Torque V/s Crank angle 36
4.4 Spring 40 Abstract:
Due to their simple design and easy maintainability jaw crushers are widely used as
rimary size reduction equipments in mechanical and mining industries. As jaw crushers break
minerals & ores of high strength and the economy of many industries depends on its
erformance; it is essential to improve the efficiency of the present design. The kinematic
nalysis of single toggle jaw crusher shows that the forces on the moving jaw plate at different
rank angle are different and hence power generated varies with crank angle. One way to
ncrease the efficiency is to store the energy in a flywheel when the supply is more than the rate
f consumption and to utilize the same when the supply falls down. Hence efforts are made to
esign a flywheel to minimize the wastage of power and to improvise the performance
arameters of single toggle jaw crusher.
Jaw plate wear has considerable affect on the life of jaw Crusher which is caused by the
ipping motion between the fed material and the jaws. This wear is predominantly serious in the
xed plate and hence the liners of the fixed jaw should be properly chosen. In addition to this the
oggle bar which acts as a safety lever has to be precisely designed. The design aspects of
ywheel, spring of tension bar and toggle bar are discussed in this paper.
Basics of Jaw Crusher
1.1 Introduction
Crushing is the process of reducing the size of solid particles into definite smaller sizes. Jaw
crushers are major size reduction machines used in mechanical, metallurgical and allied
industries. The crusher crushes the feed by some moving units against a stationary unit or against