To suppress the deterioration of the upper side packing 23 of a hydraulic cylinder 22 for lifting a bowl liner 10.
In the gyratory crusher, a cylinder 21 in which the bowl liner 10 is formed in a machine body frame 2 having a mantle 9 can be lifted by the hydraulic cylinder 22. A channel 31 is formed in the inner surface of the frame 2 on the upper side of the packing 23 of the cylinder 22, and lubricating oil is circulated from boles 27, 28 into the channel 31. Since the distance between the packing 23 and the channel 31 is short, and the cylinder 21 is rotated, the lubricating oil easily reach the packing 23 for lubrication. By the lubrication, the seizure the sliding surface of the packing 23 is prevented to reduce the damage of the packing 23 remarkably. When a support ring is fitted to the middle of the packing 23 over its whole circumference, the deformation and tumble of the packing 23 are prevented to extend its life.
NAKAJIMA NORIYUKI
HATANAKA OSAMU
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