Patent US4567243A successfully refreshed from Google Patents.
Patent US3754716A successfully refreshed from Google Patents.
US3754716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gyratory crushers
Assignee: Terex Pegson Ltd
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Filing: 1971-12-13
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Granted: 1973-08-28
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Expires: 1991-12-13
Abstract
Abstract The invention concerns gyratory crushers and proposes that the bowl in such a crusher be adjustably supported by hydraulic piston/cylinder units, hydraulically actuated wedges positioning the bowl radially when in use, and that the bowl be held in an adjusted position by locking hydraulic liquid on one side of the pistons of the support units whilst permitting the release of the bowl from the adjusted position in the event of the intrusion of tramp iron or the like. The crusher comprises a control system having elements for locking liquid on said sides, sensing elements for sensing the pressure on said sides and for actuating the locking elements to release said liquid in the event that tramp iron or the like intrudes into the crushing chamber and hydraulic acumulator elements connected to the other sides of the pistons such that, when the locked liquid is released, the bowl is automatically raised to clear the tramp iron by liquid pressure derived from said accumulator means.
Inventors
- 👤 R Webster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:03
CPC Classifications
B; B02; B02C; B02C2/00; B02C2/02; B02C2/04; B02C2/045
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
259 words
A gyratory crusher comprising in combination a fixed base frame, a concave bowl supported adjustably on said base frame, a head which gyrates within said base frame and said bowl to define an annular gap or crushing chamber through which material to be treated is passed and crushed between the bowl and the head as the latter gyrates; adjustable support means for said concave bowl said support means comprising a plurality of hydraulic piston/cylinder support units connected between the base frame and wedge units engaged between said base frame and said bowl to locate the latter radially with respect to the axis of rotation of the head; means for locking hydraulic liquid on one side of the piston of each of said support units to provide a liquid abutment against which the piston acts to transmit axial components of the crushing load to the base frame and releasing said liquid at required times; sensing means sensing the liquid pressure of said locked liquid and releasing said locking and releasing means when the pressure exceeds a predetermined level, and hydraulic accumulator means connected to the other side of each of said support units to bias the bowl towards a position in which the crushing chamber is opened to the maximum extent, so that, in the event of the instrusion of uncrushable material, the liquid locked in the support units is released and thereupon the bowl is moved to open the crushing chamber, thereby to clear the uncrushable material, by the action of liquid Pressure derived from the hydraulic accumulator means.
Claim 2
Dependent Claim
259 words
A gyratory crusher comprising in combination a fixed base frame, a concave bowl supported adjustably on said base frame, a head which gyrates within said base frame and said bowl to define an annular gap or crushing chamber through which material to be treated is passed and crushed between the bowl and the head as the latter gyrates; adjustable support means for said concave bowl said support means comprising a plurality of hydraulic piston/cylinder support units connected between the base frame and wedge units engaged between said base frame and said bowl to locate the latter radially with respect to the axis of rotation of the head; means for locking hydraulic liquid on one side of the piston of each of said support units to provide a liquid abutment against which the piston acts to transmit axial components of the crushing load to the base frame and releasing said liquid at required times; sensing means sensing the liquid pressure of said locked liquid and releasing said locking and releasing means when the pressure exceeds a predetermined level, and hydraulic accumulator means connected to the other side of each of said support units to bias the bowl towards a position in which the crushing chamber is opened to the maximum extent, so that, in the event of the instrusion of uncrushable material, the liquid locked in the support units is released and thereupon the bowl is moved to open the crushing chamber, thereby to clear the uncrushable material, by the action of liquid Pressure derived from the hydraulic accumulator means.
Claim 3
Dependent Claim
84 words
A gyratory crusher in accordance with claim 1 further comprising a timer which controls the said locking and releasing means to return the latter to the locked condition a predetermined length of time after it has been actuated by the sensing means so that the bowl may be returned to the adjusted position, said length of time being selected to ensure that the chamber is opened to a sufficient extent to permit the passage of any size of uncrushable material likely to be encountered.
Claim 4
Dependent Claim
95 words
A gyratory crusher in accordance with claim 2, further comprising position sensing means arranged to sense the arrival of the bowl at the adjusted position, and pump means for supplying liquid to the sides of the said support units in which liquid is normally locked when the crusher is in use, the pump means being activated whenever the bowl moves out of the adjusted position as a result of actuation of said locking and release means by the sensing means but remaining ineffective until the latter is returned to the locked position by the timer.
Claim 5
Dependent Claim
48 words
A gyratory crusher in accordance with claim 3, further comprising a directional valve connected to direct the output from the pump means to either side of the pistons of the said support units thereby to permit the crushing chamber to be set to a plurality of selected sizes.
Claim 6
Dependent Claim
48 words
A gyratory crusher in accordance with claim 4, further comprising sensing means arranged to control the directional valve so that adjustment of the sensing means to select a new size of crushing chamber automatically actuates the directional valve to cause movement of the bowl to an appropriate position.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |