Gyratory crusher with arrangement for restricting rotation
A gyratory crusher has a crushing head on which a first crushing shell is mounted, a frame on which a second crushing shell is mounted, and a driving device, which is arranged with a rotating eccentric to cause the crushing head to execute a gyratory movement for crushing of material. The crushing head is connected to the frame of a rotation-restricting arrangement, which comprises a beater in a tank. Spinning of the crushing head is restricted by the beater being braked, during operation of the crusher, by a liquid contained in the tank.
1. A gyratory crusher, which comprises a crushing head on which a first crushing shell is mounted; a frame on which a second crushing shell is mounted, wherein the second crushing shell defines, together with the first crushing shell, a crushing gap; and a driving device, which is arranged with a rotating eccentric to cause the crushing head to execute a gyratory movement for crushing material that is introduced in the crushing gap,
wherein the crushing head is connected to the frame by way of a rotation-restricting arrangement, which comprises a beater arranged to rotate in a tank, the tank being adapted to contain a liquid for braking the rotation of the beater.
2. The crusher according to claim 1 , wherein the eccentric is arranged to rotate about a central shaft and the rotation-restricting arrangement is located inside the central shaft.
3. The crusher according to claim 1 , wherein the tank has a circular-cylindrical wall, which is provided with at least one protrusion extending towards the beater.
4. The crusher according to claim 1 , wherein the beater comprises a beater shaft provided with at least one projecting member, which is to be braked, during rotation of the beater, by a liquid contained in the tank.
5. The crusher according to claim 4 , wherein said at least one projecting member of the beater is substantially plate-shaped and extends from the beater shaft in a plane that is substantially parallel to the extent of the beater shaft.
6. The crusher according to claim 4 , wherein said at least one projecting member of the beater is of arcuate cross-section, as seen in a plane that is perpendicular to the beater shaft.
7. The crusher according to claim 4 , wherein the portion of said at least one projecting member of the beater that is most radially distant from the beater shaft is deflectable.
8. The crusher according to claim 1 , wherein the beater is connected to the crushing head by a universal joint shaft, which is provided with at least one universal joint.
9. The crusher according to claim 8 , wherein the universal joint shaft is divided into an upper shaft section and a lower shaft section, and said shaft sections are rotationally locked together and axially displaceable relative to each other.
10. The crusher according to claim 1 , wherein the rotation-restricting arrangement is adapted to generate, during operation, a braking torque of at least 300 Nm when the crushing head is about to start rotating.
11. The crusher according to claim 1 , wherein a speed of rotation relative to the frame of the crushing head, when the crushing head is about to start rotating, is 0 revolutions per second.
12. A crusher according to claim 1 , wherein the crushing head is connected to the rotation-restricting arrangement by a torque limiter.