Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Patent
1997-02-24
1998-06-30
Husar, John M.
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
241291, 241300, B02C 110
Patent
active
057721351
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to jaw crushers for crushing rocks and other mineral matter, and more particularly to replaceable jaw faces for jaw crushers.
Jaw crushers for crushing rock and other minerals conventionally comprise a fixed jaw and a movable jaw which define a crushing chamber of a cross section which narrows from top to bottom. The movable jaw is pivotally supported at its upper end so that the lower end of the jaw can be driven in a swinging motion towards and away from the lower end of the fixed jaw. Material to be crushed is introduced into the upper end of the crushing chamber formed between the two jaws and is crushed between the two jaws by the swinging movement of the movable jaw as the material moves downwardly through the chamber, the crushed material being discharged from the chamber at its lower end. The crushing surfaces of the two jaws are subject to substantial wear and are conventionally formed by replaceable faces which are fixed to the body of the jaw by being bolted and keyed. Usually, to facilitate breakage of the rock the surface of each replaceable jaw face is corrugated, with the axes of the corrugations extending in a vertical direction and normally each jaw carries two separate jaw faces, namely an upper face and lower face. The primary effect of the corrugations is achieved at the lower, narrow, end of the crushing chamber, and in order to generate the necessary breaking forces the opposed jaw faces of the two jaws are so arranged that the peaks of the corrugations of one of the jaw faces align with the troughs of the corrugations of the other jaw face. As a result of this, with conventional jaw faces there is limited scope for interchangeability of the various jaw faces to compensate for wear, most of which occurs at the lower end of the crushing chamber; for example with conventional jaw faces the upper and lower jaw faces or each jaw could be interchanged but there is not complete flexibility to interchange the four jaw faces while retaining the required relationship between the sets of corrugations.
According to the present invention, there is provided a replaceable jaw face for a jaw crusher, the jaw face having corrugations the axes of which extend along the height of the jaw face, wherein the axes of the corrugations are inclined to the vertical such that there is a lateral phase shift of approximately 90.degree. (or an odd number multiple thereof) of the corrugations between the upper and lower end edges of the face whereby when two such jaw faces are placed in opposed relationship on the opposite jaws of a jaw crusher with the lower end edges of the respective faces at the lower end of the crushing chamber of the crusher, the opposed corrugations will, in the zone of the lower end exhibit a phase relationship wherein the peaks of the corrugations of one of the faces will substantially align with the troughs of the corrugations of the other face.
In a preferred embodiment, the phase shift between the upper and lower end edges of the said face is slightly more than 90.degree. so that precise matching of the peaks and troughs of the opposed corrugations of the two opposed jaw faces will occur at a position adjacent to, but above, the lower ends of the two jaw faces.
In a preferred embodiment, two identical jaw faces as defined above are mounted on each jaw as a lower and upper jaw face, the upper jaw face being formed by 180.degree. inversion of the jaw face, and the corrugations at the end edge of the jaw face which is to lie at an intermediate position along the height of the jaw are such that when the end edges of the upper and lower jaw faces are in abutting relation the corrugations of the lower jaw face will form a direct continuation of the corrugations of the upper jaw face.
According to another aspect of the invention, there is provided a jaw crusher having fixed and movable jaws and identical jaw faces as defined above mounted to the jaws. Preferably four such jaw faces are used to form upper and lower jaw faces of the two jaw.
An embodiment of the in
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Clyde Industries Limited
Husar John M.
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