Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Patent
1976-11-08
1977-11-29
Lake, Roy
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
138 26, 138 30, 138 44, 241215, 241290, B02C 206
Patent
active
040602052
ABSTRACT:
A hydraulic accumulator particularly useful in connection with gyratory crushers of the type in which the crusher head and shaft are hydraulically supported so that when the crusher head encounters uncrushable material such as "tramp iron" the crusher head can move down to pass the tramp iron, causing at least some of the hydraulic fluid supporting the crusher shaft to be ejected to a hydraulic accumulator. A plurality of gyrations of the crusher may occur before the tramp iron passes. The accumulator chamber which receives the hydraulic fluid ejected from beneath the crusher shaft contains a gas precharged elastic bladder. Hydraulic fluid is admitted to the accumulator chamber through a poppet valve built into the accumulator structure, which valve is normally spring biased to a closed position against its valve seat. When the hydraulic pressure in the conduit connecting the hydraulic cylinder beneath the crusher shaft to the accumulator decreases to a predetermined value during a portion of each cycle of gyration of the crusher, the biasing spring closes the poppet valve and traps the hydraulic fluid in the accumulator chamber before any significant reverse hydraulic flow can occur, thereby preventing "water hammer" in the conduit connecting the hydraulic cylinder of the gyratory crusher to the accumulator. The poppet valve or the valve seat therefor are provided with a bleed passage or passages which permit a very restricted return hydraulic flow from the accumulator to the hydraulic cylinder of the gyratory crusher when the poppet valve is in closed position.
REFERENCES:
patent: 2579516 (1951-12-01), Roubal
patent: 2667309 (1954-01-01), Becker
patent: 2773455 (1956-12-01), Mercier
patent: 3801026 (1974-04-01), Decker et al.
patent: 3830259 (1974-08-01), Mercier
patent: 3873037 (1975-05-01), Decker et al.
Allis-Chalmers Corporation
Goldberg Howard N.
Lake Roy
Sullivan Robert C.
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