Patent GB-1030226-A (GB)
Title: Improvements in or relating to gyratory crushers
IPC: B02C2/04
Filed: 1962-11-14
Abstract: 1,030,226. Gyratory crushers. NORDBERG MANUFACTURING CO. Nov. 14, 1962 [Nov.14, 1961], No.43102/62. Heading B2A. A gyratory crusher comprises a crushing bowl 104 screw threaded into a supporting ring 100 with a screw-threaded locking ring 200 surmounting and co-operating with the screw-thread interconnection of the bowl and supporting ring. The supporting ring is yieldingly held on the crusher frame so that the assembly of supporting ring, bowl and locking ring can tilt by parting from the frame when the bowl encounters uncrushable material. The assembly incorporates, wholly on the bowl side of the supporting ring parting-line with the frame, a thrusting arrangement 204 which exerts a releasable axial thrust directly upon the locking ring so that an upward thrust is transmitted to lift the bowl in the supporting ring during normal operation of the crusher and thereby take up the screw-thread clearance between the engaged threads of the bowl and supporting ring. As described, the thrusting means 204 is protected against the intrusion of dust by one or more parts of the crusher which surrounds the thrusting means, viz. a protective cap having a depending skirt resting on the support for the crushing bowl. The locking ring 200 has a number of downwardlyopening individual sockets 202 for the thrusting units, each being positioned in a corresponding socket 206 in the supporting ring 100. The units comprise a cylinder 208 carrying a piston 210 having a rod 212 surrounded by spring washers 214 providing upward thrust. The upper one bears against the piston and the lower one against a seat ring 216 held in the cylinder. The rod 212 extends through the top of the cylinder to bear against the locking ring at 218, and the outside of the cylinder has a shoulder 220 which seals on top of the adjustment ring 100. The top of the piston in each thrusting unit forms a chamber 222 connected to a high pressure hydraulic or pneumatic source which forces the piston down and frees the bowl 104 for rotary adjustment. The screw-threads between the bowl, the supporting ring 100 and the locking ring 200 are protected by a top cap 224, Fig. 1 (not shown), sealed at 226 to an upper bowl extension with a skirt 228. A torque ring 231, Fig. 8, is connected to the outside of the top cap and is releasably held on the supporting ring 100 by a number of levers which pivot under a flange on the adjustment ring. The upper end of the bowl is keyed to the top cap so that when the cap is rotated the bowl rotates and moves up or down. The bottom of the threads is also closed by a continuous annular seal 234, the outer lip 238 of which is opposed by a cylindrical surface 239. Around the adjustment ring are sockets 244 each having a rod 246 surrounded by a coil spring 248 supported on a ring 249, and so held that the rods are forced upwards and keep the seal against the bottom of the ring. To release the machine in the event of jamming, the bowl and adjustment ring assembly are raised by hydraulic jacks 252, each mounted on a pedestal 254 and having a push rod 256 making contact with the adjustment ring.