horizontal shaft impact crusher introduction
here the feed material is crushed by highly rigorous impacts originating in the quick rotational movement of hammers/bars fixed to the rotor. the particles are then crushed inside the crusher as they collide against crusher parts and against each other, producing finer, better-shaped product. adjusting the distance between impact frame and rotor frame can change the shape and size of the output.
in an impact crusher the breakage takes place in a lesser time span as compared to the conical or jaw crushers. so here the nature and magnitude of forces as well as the energy dissipated due to impact breakage is different from that of the relative slow breaking that occurs due to compression or shear in other type of crushers.
operating principle of the horizontal shaft impact crusher
the impact crusher machine rotor revolves in fixed direction by means of driving action of triangle belt that connects with motor. above rotor, there are sets of suspended impact plates. material enters into the crushing chamber through the charging hole and feeding guide plate. the blow bars fixed on rotor strikes the feed material onto impact plate and then fall from it to mutually shock material blocks.
therefore, material will be moved recurrently and repeatedly in the crushing chamber that is composed of rotor, impact plate/ anvils, hammers/ blow bars , by means of which intense shock phenomenon will act predominantly, and the material will be crushed along its natural crack and hence bulge. the gap between impact plate and hammer/blow bar can be adjusted according to practical requirement by adjusting the angle and distance of the impact anvils. product output is easily controlled by varying the rotor speed, input feed rate and the grinding screen configuration.
impact crusher design parameters:
for good performance, all the factors below should be taken into account:
1. assortment of a proper crushing chamber for the material.
2. feed rate control.
3. apt dimensioning of the discharge conveyor with regards to crusher’s capacity.
4. selection of proper material and size for the impacting members.
5. setting of the optimum number of hammers, rotor speed, etc.
6. the input material properties like density, strength, etc.
the factors below, when not taken care of may affect the performance of a crusher.
1. occurrence of humid material in the crushers’ feed.
2. extreme humidity.
3. isolation of feed in the crushing chamber.
4. irregular dispersal of feed over the crushing chamber
5. deficiency of feed control.
6. incorrect motor size.
7. deficient capacity of the crushers’ discharge conveyor.
8. extremely hard material for crushing.
9. crusher functioning at a rotation speed below required conditions.