US 4,615,491 AGranted

Gyratory crusher with automatic tramp iron release

AssigneeTelsmith Division Barber-Greene Company

InventorsJoseph Batch, Robert G. Stafford

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Abstract

The crusher of this invention has a conical crushing head that gyrates in an annular lower frame member. An upper frame member that seats on the lower frame member in a normal operative position comprises a bowl that cooperates with the head to define a crushing gap. Upright, circumferentially spaced double-acting hydraulic jacks are connected between the lower frame member and a tie ring surrounding it; and upright, circumferentially spaced tie rods connect the tie ring with the upper frame member. Preferably the piston rods of the jacks project downward. The upper jack chambers are normally communicated with a fluid pressure system that maintains fluid in them at a predetermined pressure and comprises an accumulator charged by a hydraulic pump that is controlled by a pressure responsive switch. A relief valve near each jack vents fluid from its upper chamber to its lower one when pressure in said upper chamber exceeds said predetermined value by a predetermined amount, as when tramp iron lifts the bowl. The lower chambers are normally communicated with a source of unpressurized fluid. A selector valve reverses the connections to the jack chambers for bowl lifting.

Claims9

Dependent claims

In a crusher having a cone that gyrates in an annular relatively stationary lower frame member and having an annular upper frame member which is normally supportingly engaged against said lower frame member to occupy a defined operating position and which comprises a bowl that cooperates with said cone to define a crushing gap, bowl control means for normally imposing upon said upper frame member a predetermined downward force that tends to maintain said upper frame member in its operating position, said bowl control means being characterized by:

A. a plurality of double-acting hydraulic jacks disposed at circumferentially spaced intervals around said frame members, each comprising a piston slideable in a cylinder and having a pair of pressure chambers in its cylinder at opposite sides of its piston;
B. means so connecting each of said jacks between the upper and the lower frame members that pressure of fluid in one of said chambers of the jack cylinder is translated into a downward force upon the upper frame member;
C. hydraulic pressure means normally communicated with said one chamber of every jack, said hydraulic pressure means providing a source of fluid at substantially a predetermined pressure, comprising:
(1) an accumulator,
(2) a pump for charging said accumulator with fluid, and
(3) pressure responsive control means operatively associated with said pump and said accumulator for directing fluid from said pump to said accumulator when fluid at the accumulator has less than said predetermined pressure and for preventing charging of the accumulator when fluid thereat has substantially said predetermined pressure;
D. normally closed relief valve means connected between said one chamber of every jack cylinder and the other chamber thereof, said relief valve means being arranged to open for transferring fluid from said one chamber to said other chamber when fluid in said one chamber has a pressure which exceeds said predetermined pressure by a predetermined amount;
and
E. means venting the other chamber of every jack cylinder to a source of unpressurized fluid at all times that the crusher is in crushing operation.

6 more elements

A crusher having a cone that gyrates in an annular relatively stationary lower frame member and having an annular upper frame member comprising a bowl that cooperates with said cone to define a crushing gap, said crusher being characterized by:

A. cooperating abutment means on said upper and lower frame members, engageable for support of the upper frame member upon the lower frame member in a predetermined operative position from which the upper frame member can be raised;
B. a plurality of double-acting hydraulic jacks arranged at circumferentially spaced intervals around the lower frame member, each having
(1) a cylinder with a substantially upright axis,
(2) a piston slidable in said cylinder and having a downwardly projecting rod,
(3) upper and lower pressure chambers in said cylinder, at opposite sides of the piston, and
(4) the lower chamber of every said cylinder being vented to a zone of unpressurized fluid at all times that the crusher is in crushing operation;
C. means providing a swivel connection between the upper end of each jack cylinder and the lower frame member, near the top of the latter;
D. a tie ring surrounding the lower frame member and to which the piston rod of each jack has a swivel connection;
E. a plurality of elongated upright tie rods at circumferentially spaced intervals around the frame members, through which upward and downward forces that the jacks impose upon the tie ring are transferred to the upper frame member, each of said tie rods
(1) having at its lower end a connection with the tie ring and
(2) having at its upper end a connection with the upper frame member;
F. hydraulic pressure means normally communicated with the upper chamber of every jack cylinder and providing a source of fluid at substantially a predetermined pressure, said hydraulic pressure means comprising
(1) an accumulator,
(2) a pump for charging said accumulator with fluid, and
(3) pressure responsive control means operatively associated with said pump and said accumulator for directing fluid from said pump to said accumulator when fluid at the accumulator has less than said predetermined pressure and for preventing charging of the accumulator when fluid thereat has said predetermined pressure;
and
G. relief valve means adjacent to said cylinders of each jack, arranged to open when fluid in the upper chamber of the jack has a pressure which exceeds said predetermined pressure by a predetermined amount, for flow of fluid from said upper chamber to the lower chamber of the jack.

14 more elements

A. cooperating abutment means on said upper and lower frame members, engageable for support of the upper frame member upon the lower frame member in a predetermined operative position from which the upper frame member can be raised;
B. a plurality of double-acting hydraulic jacks at circumferentially spaced intervals around the lower frame member, each having
(1) a cylinder with a substantially upright axis,
(2) a piston slideable in said cylinder, and
(3) a pair of pressure chambers in said cylinder, at opposite sides of the piston;
C. means connecting each of said jacks for reaction between the upper and lower frame members whereby pressure fluid in one of said chambers of the jack imposes a downward force upon said upper frame member that tends to maintain it in its operative position;
D. a selector valve having connections with both of said chambers of every jack and having alternatively selectable normal and bowl-raising conditions;
E. a source of substantially unpressurized fluid that is connected with said selector valve to be communicated therethrough with the other chamber of every jack when the selector valve is in its normal position and to be communicated with said one chamber of every jack when the selector valve is in its bowl-raising position;
F. hydraulic pressure means connected with said selector valve to be communicated therethrough with said one chamber of every jack when the selector valve is in its normal position and to be communicated with said other chamber of every jack when the selector valve is in its bowl-raising position, said hydraulic pressure means comprising
(1) an accumulator,
(2) a pump for drawing fluid from said source and charging said accumulator, and
(3) pressure responsive control means operatively associated with said pump and said accumulator for directing fluid from said pump to said accumulator when fluid at the accumulator has less than said predetermined pressure and for preventing charging of the accumulator when fluid thereat has substantially said predetermined pressure;
and
G. pressure relief valve means adjacent to each of said hydraulic jacks, arranged to open when pressure of fluid in said one chamber of an adjacent jack exceeds said predetermined pressure by a predetermined amount and which, when open, communicates said one chamber of the jack with its other chamber.

11 more elements

Dependencies are inferred from the claim text.