Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Patent
1995-09-11
1997-02-04
Husar, John M.
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
241268, B02C 104
Patent
active
055989829
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to cantilevered swing jaw crushing apparatus, and in particular to means for reducing the forces acting on the mounting points of the cantilevered swing jaw.
BACKGROUND OF THE INVENTION
Apparatus for crushing rocks and other materials are well known. Many crushing apparatus incorporate a stationary jaw and a swing jaw which move towards and away from each other during use to crush rocks therebetween. The swing jaw may be straight, as in the well known "Blake" type crushers (cf. GB-853080), or cantilevered as in the crusher disclosed in GB-2232095, for example.
The manner in which the various types of crushing apparatus function varies considerably depending upon whether the swing jaw is straight or cantilevered. The present invention relates solely to the cantilevered type swing jaw crushing apparatus.
WO 89/04718 (GB-2232095) discloses a cantilevered swing jaw crushing apparatus comprising a main frame, a stationary law, a cantilevered swing jaw mounted about a top pivot axis and means for driving the swing jaw. The apparatus further includes a vertical impact plate mounted on the main frame for protecting the swing jaw from rocks entering the crushing apparatus through the feed opening. The rocks strike the impact plate which absorbs the energy associated therewith. Although such an impact plate is useful in a crushing apparatus, because it reduces the forces applied to the mounting hinge of the swing jaw, the arrangement is not ideal and the present invention aims to improve upon it.
SUMMARY OF THE INVENTION
The present invention provides a cantilevered swing jaw crushing apparatus comprising a main frame, two jaws mounted on the main frame for crushing material passing through the apparatus and means for driving the jaws in a crushing action, wherein the cantilevered swing jaw comprises an upper portion pivotally attached to the main frame and a lower portion for cooperating with the second jaw of the apparatus, the upper and lower portions defining an elbow, characterised in that the cantilevered swing jaw is mounted on the main frame by means of two short stub axles extending inwardly from the main frame, and in that a bearing support is mounted on the main frame and bears against the rear of the elbow of the cantilevered swing jaw to support the swing jaw throughout the motion of the jaw such that at least some forces exerted on the swing jaw are transferred to the main frame rather than to the stub axles mounting the swing jaw.
By including the bearing support, the mounting of the swing jaw does not bear the full force exerted on the swing jaw when rocks or the like are entered into the crushing apparatus.
In one embodiment, the bearing support includes an arcuate surface which contacts the swing jaw throughout the motion of the jaw. Of course, the bearing support may, alternatively, include a plurality of arcuate surfaces spaced across the width of the swing jaw.
The arcuate surface is preferably self-lubricating. In this regard, the arcuate surface may be coated in polytetrafluoroethylene (PTFE) or may be formed of nylon or some other appropriate material.
If the bearing support includes an arcuate surface, one or more shim is preferably provided between the arcuate surface and the main frame. The or each shim helps to prevent excessive wear between the bearing support and the main frame.
In an alternative embodiment, the bearing support may include a roller, the surface of which contacts the swing jaw throughout the motion of the jaw.
A single roller may extend across the complete width of the crushing apparatus. Alternatively, a plurality of rollers spaced across the width of the crushing apparatus, or a pair of rollers supporting either side of the swing jaw, could equally well be used.
The or each roller may be made of steel or any other appropriate material. If steel is used, the roller is preferably made of rolled steel.
Irrespective of which specific embodiment of bearing support is used, the bearing support is preferably enclosed by the
REFERENCES:
patent: 4398674 (1983-08-01), Dremann
patent: 4512524 (1985-04-01), Shigemizu
patent: 4989797 (1991-02-01), DeDiemar et al.
Betts Edmund W.
Elliott Wayne
James Teddy B.
Brown Lenox & Co. Limited
Husar John M.
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