US 5,482,218 AGranted

Rock crushing apparatus and method

OwnerYonggan Hainventor

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Abstract

The invention provides an apparatus for crushing material such as rock and includes a support structure having an inlet and an outlet. A powered rotor shaft rotates with respect to the support structure about a shaft axis, and a rotor mounted eccentrically on shaft describes orbital motion about the shaft axis. The rotor has a rotor wall which moves cyclically and laterally with respect to the axis during the orbital motion. At least one stator is mounted in the support structure to provide a stator wall spaced oppositely from the rotor wall to define therewith opposing walls of a crushing chamber located between the inlet and outlet. Feed direction of material passing between the inlet and outlet is generally perpendicular to the shaft axis, and when the rotor describes the orbital motion, spacing between opposing walls of the chamber varies cyclically. The stator is mounted yieldably so as to move away from the rotor when a pre-determined threshold force is exceeded so as to reduce possible damage. The invention provides a relatively wide crushing ratio and can accept relatively large rocks to reduce them to a relatively fine gravel. The invention generates an essentially continuous crushing action with relatively uniform crushing forces and is dynamically balanced to permit high speed operation to perform "multi-layer" crushing.

Claims35

Dependent claims

A method of crushing material, the method comprising the steps of:

(a) admitting the material into a crushing chamber,
(b) moving an eccentrically mounted rotor in an orbital motion about a shaft axis within the crushing chamber to provide a rotor wall which is disposed parallel to the shaft axis when viewed laterally of the axis and which moves cyclically and laterally with respect to the shaft axis as the rotor describes the orbital motion, the rotor being moved by rotatably mounting a shaft carrying the rotor in axially spaced apart housing end walls of the crushing chamber, each end wall comprising separable end wall portions, providing the end wall portions with releasable connecting means for releasably interconnecting the separable adjacent end wall portions and for mounting the shaft, and mounting two axially spaced apart end wall portions for limited hinged rotation with respect to a chassis,
(c) spacing a stator laterally from the rotor to provide oppositely facing rotor and stator walls which are parallel to each other when viewed laterally of the axis and which define in part walls of the crushing chamber so that, when the rotor is moving, spacing between the opposing walls varies cyclically, the stator being supported by hinging a first end portion of the stator with respect to the hinged end wall portion, and yieldably restraining a second end portion of the stator with a linear actuator having an inner end hinged to the chassis, and an outer end hinged to the stator to permit the stator wall to move yieldably when the crushing force exceeds a pre-determined threshold force,
(d) discharging crushed material from the crushing chamber, and
(e) if servicing is required, after stopping the rotor, disconnecting the releasable connecting means of the end walls and the shaft to permit eventual separation thereof, and releasably connecting the stator to the hinged end wall of the housing, and actuating the linear actuator so as to rotate the end wall portions and the connected stator with respect to the chassis, so as to swing the end wall portions and the said stator away from the stator to permit access for servicing the rotor, the rotor shaft and stator.

2 more elements

An apparatus for crushing material, the apparatus comprising:

(a) a support means having an inlet and an outlet to receive material to be crushed and to discharge crushed material respectively, the support means comprising a support housing having first and second housing end walls spaced axially apart, each housing end wall comprising two separable end wall portions, at least one separable end wall portion of each housing end wall being hinged for rotation about a respective housing hinge of a chassis of the support means to permit separation of the separable end wall portions;
(b) a powered rotor shaft mounted for rotation with respect to the support means about a shaft axis, and a rotor shaft mounting means cooperating with the first and second housing end walls to mount the rotor shaft for rotation relative to the support housing;
(c) a rotor mounted eccentrically on the shaft for orbital motion about the shaft axis, the rotor having a rotor wall which is parallel to the shaft axis when viewed laterally of the axis, and which moves cyclically and laterally with respect to the axis when the rotor describes the orbital motion;
(d) at least a first stator mounted in the support means, the stator having first and second end portions, the first end portion being hinged for rotation relative to the hinged separable end wall portions of the adjacent support housing, the first stator having a first stator wall spaced oppositely from the rotor wall and disposed parallel to the rotor wall when viewed laterally of the axis to define therewith opposing walls of a first crushing chamber located between the inlet and outlet of the housing, so that when the rotor is describing the orbital motion spacing between the opposing walls varies cyclically,
(e) yieldable mounting means comprising an extensible and retractable linear actuator extending between the stator and the support means to provide a yieldable mounting for the stator with respect to the support means, the linear actuator having an inner end hinged to the chassis of the support housing and an outer end hinged to the second end portion of the stator, and
(f) releasable access connecting means to releasably connect the stator to adjacent portions of the hinged separable end wall portions of the housing, so that when the access connecting means connect the stator to the hinged separable end wall portions, while removing the rotor shaft, actuation of the linear actuator rotates each hinged separable end wall portions to separate each hinged wall portion from the remaining end wall portions, and to move the stator and the separable end wall portions generally laterally outwardly from the rotor shaft, to permit access for servicing the rotor shaft, the rotor and the stator.

3 more elements

An apparatus for crushing material, the apparatus comprising:

(a) a support means having an inlet and an outlet to receive material to be crushed and to discharge crushed material respectively;
the support means comprising a support housing having first and second housing end walls spaced axially apart, each housing end wall comprising two separable end wall portions, each end wall portion being hinged for rotation about a respective housing hinge of a chassis of the support means;
(b) a powered rotor shaft mounted for rotation with respect to the support means about a shaft axis, and a rotor shaft mounting means cooperating with the first and second end walls to mount the rotor shaft for rotation relative to the support housing;
(c) a rotor mounted eccentrically on the shaft for orbital motion about the shaft axis, the rotor having a rotor wall which is parallel to the shaft axis when viewed laterally of the axis, and which moves cyclically and laterally with respect to the axis when the rotor describes the orbital motion;
(d) first and second stators mounted in the support means;
the first stator having a first stator wall spaced oppositely from the rotor wall and disposed parallel to the rotor wall when viewed laterally of the axis to define therewith opposing walls of a first crushing chamber located between the inlet and outlet of the housing, the second stator being disposed on a side of the rotor remote from the first stator so that the rotor is partially enclosed by the first and second stators, the second stator having a second stator wall spaced oppositely from the rotor to define therewith opposing walls of a second crushing chamber located between the inlet and the outlet of the housing, the walls of the first and second crushing chambers defining in part first and second feed directions of the material passing through the apparatus from the inlet to the outlet thereof, the first and second feed directions being generally perpendicular to the shaft axis, so that when the rotor is describing the orbital motion, spacing between the opposing walls varies cyclically, each stator having first and second end portions, the first end portion of each stator being hinged for rotation relative to adjacent hinged separable end wall portions of the support housing,
(e) yieldable mounting means comprising first and second extensible and retractable linear actuators extending between the second end portions of the first and second stators respectively and the support means to provide yieldable mountings for each stator with respect to the support means, each linear actuator having an inner end hinged to the chassis, and an outer end connected to the respective stator;
and
(f) releasable access connecting means to releasably connect the first and second stators to adjacent portions of the respective separable end wall portions of the housing, so that when the access connecting means connects the stators to the hinged separable end wall portions of the housing, while removing the rotor shaft, actuation of the linear actuators rotates the respective separable end wall portions to separate the end wall portions and to move the stators and the separable end wall portions generally laterally outwardly from the rotor shaft, to permit access for servicing of the rotor shaft, the rotor and the stators.

6 more elements

An apparatus for crushing material, the apparatus comprising:

(a) a support means having an inlet and an outlet to receive material to be crushed and to discharge crushed material respectively,
(b) a powered rotor shaft mounted for rotation with respect to the support means about a shaft axis,
(c) a rotor mounted eccentrically on the shaft for orbital motion about the shaft axis, the rotor having a rotor wall which is parallel to the shaft axis when viewed laterally of the axis, and which moves cyclically and laterally with respect to the axis when the rotor describes the orbital motion,
(d) first and second stators mounted in the support means;
(i) the first stator having a first stator wall spaced oppositely from the rotor wall and disposed parallel to the rotor wall when viewed laterally of the axis to define therewith opposing walls of a first crushing chamber located between the inlet and outlet of the housing;
(ii) the second stator being disposed on a side of the rotor remote from the first stator, so that the rotor is partially enclosed by the first and second stators, the second stator having a stator wall spaced oppositely from the rotor to define therewith opposing walls of a second crushing chamber located between the inlet and the outlet of the housing;
(iii) the walls of the first and second crushing chambers defining in part first and second feed directions of the material passing through the apparatus from the inlet to the outlet thereof, the first and second feed directions being generally perpendicular to the shaft axis, so that when the rotor is describing the orbital motion spacing between the opposing walls varies cyclically;
(iv) the first stator wall being centred on a first stator axis spaced from the shaft axis at a first axis spacing and disposed within a radially aligned plane containing the shaft axis and extending generally towards the inlet, so that cross-sectional area of a first crushing chamber defined in part by the rotor wall and the first stator wall decreases in the feed direction;
and
(v) the second stator wall being centred on a second stator axis spaced from the shaft axis at a second axis spacing, and disposed within the said radially aligned plane containing the shaft axis, so that cross-sectional area of the second crushing chamber defined in part by the rotor wall and the second stator wall decreases in the feed direction through the second chamber, the second axis spacing being smaller than the first axis spacing,
so that cross-sectional area of the second crushing chamber at a specific location in the second crushing chamber is less than cross-sectional area of the first crushing chamber at the corresponding specific location in the first crushing chamber,
(e) first and second inlet hoppers communicating with the first and second crushing chambers respectively, the first inlet hopper being adapted to receive coarse material and the second inlet hopper being adapted to receive intermediate crushed material, the first crushing chamber having a first discharge opening to discharge intermediate crushed material, and the second crushing chamber having a second discharge opening to discharge fine crushed material, and
(f) a conveyor extending between the first discharge opening and the second inlet hopper to convey the intermediate crushed material from the first crushing chamber to the second crushing chamber for further processing.

10 more elements

Dependencies are inferred from the claim text.