SANDVIK CH420:01, Installation Manual, Page: 14 / 110

1. Introduction
12 © Sandvik SRP AB – Doc. no. S 223.510 en Ver. 1 CH420:01
1.2 Operating principles of a cone crusher
In a cone crusher, the process material is crushed between two rigid surfaces.
The motion of the moving surface is independent of the load on the crusher.
The crushing action is achieved by an eccentric gyratory movement of the
mainshaft (6). Individual pieces of process material are nipped, compressed
and crushed between the mantle (4) and the concave ring (3).
The quality and quantity of the produced process material is a product of the
interaction between the crusher and the process material. The crushing
chamber geometry, the crusher’s dynamics, and the quality of the process
material are the most important factors.
The concave ring (3), mantle (4), eccentric assembly (5) and the location of
the pivot point determine the chamber geometry of the cone crusher. The
crusher’s drive motor rotates the eccentric assembly at a constant speed
through a gear transmission. The rotation of the eccentric assembly causes
the lower end of the mainshaft to gyrate. At the top of the mainshaft (6) is the
spider bearing (1) that acts as the pivot point for this gyrating motion.
The mantle (4) is fixed to the mainshaft (6) and the concave ring (3) is fixed
to the topshell (2). The gyration of the mainshaft (6) means that the distance
between the mantle (4) and any given point on the concave ring continually
varies. When this distance decreases the incoming process material will be
subjected to a compressing stress and will be crushed. When the mantle
moves away from the concave ring, the process material is able to flow down
through the chamber.
The mantle (4) and the concave ring (3) must be replaced regularly as they
are subject to continous wear. The rate of wear depends on the characteristics
of the process material. Read more in OM section 10.2.
1 Spider bearing
2 Topshell
3 Concave ring
4 Mantle
5 Eccentric assembly
6 Mainshaft
1
2
3
4
5
6