Solid material comminution or disintegration – Apparatus – Stationary comminuting surface or material bed
Patent
1989-09-08
1991-08-06
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
Stationary comminuting surface or material bed
B02C 1900
Patent
active
050370359
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a machine for comminuting materials.
GB-A-2092916 describes a machine for comminuting materials which is in the form of an impact breaker, that is to say, a machine for comminuting brittle materials by the dissipation of kinetic energy impact. The machine described in GB-A-2092916 comprises a hollow impeller rotatable about substantially vertical axis and having interior walls, an upwardly opening material inlet and at least one radially outward material outlet. Means are provided for feeding the material to be comminuted into the material inlet, the feeding means comprising an upper stationary portion and a lower portion which is rotatable to impart to the material being fed an angular velocity about an axis substantially coincident with the axis of rotation of the impeller. The feeding means is so dimensioned as to cause material fed therethrough to be in a choked condition when the lower portion is rotating. At least one anvil is arranged to be struck by material which has emerged from the material outlet or outlets after travelling along at least a portion of the interior walls of the impeller.
As the material to be comminuted travels through the radially outward material outlet or outlets, the walls thereof are subject to wear, and, accordingly, those walls are lined with materials which are abrasion resistant. This abrasion resistant material is provided in the form of removable components which can be replaced as and when excessive wear has occurred. The replacement of these wear parts can constitute a very significant portion of the cost of operating the impact breaker, depending on the nature of the material being comminuted, besides which it is inconvenient to have to stop the machine frequently to change the wear parts. It is therefore desirable to be able to use for these wear parts materials having the highest abrasion resistance possible.
From the point of view of resistance to abrasion the best materials currently available are certain ceramics. Setting aside some, for example tungsten carbide, which are extremely expensive, the most useful materials as regards abrasion resistance include aluminium oxide and silicon carbide. However, these materials are very brittle, and can therefore only be used where the maximum impact force to which they are liable to be subjected is sufficiently low not to cause them to fracture. It is an object of the present invention to provide a machine for comminuting material by impact, the design of which is such that brittle materials can be used for the wear parts mentioned above.
According to the present invention there is provided a machine for comminuting material by impact, comprising a hollow impeller rotatable about a substantially vertical axis an upwardly opening material inlet and at least one radially outward material outlet duct, the or each said duct being sufficiently narrow to prevent material striking the walls thereof with a high impact force; and at least one anvil arranged to be struck by material which has emerged from the said at least one duct.
An embodiment of the present invention is shown in the accompanying drawings, in which:
FIG. 1 is a plan view of an impeller forming part of the machine according to the present invention;
FIG. 2 is a section taken along line A--A in FIG. 1, on a larger scale;
FIG. 3 is a section taken on line B--B in FIG. 1, also on a larger scale;
FIG. 4a and 4b are a plan view, and a section on line A--A in FIG. 4a respectively, of an accelerator plate forming part of the impeller of FIG. 1;
FIG. 5 is an underplan view of a rotatable ring forming part of the machine according to the present invention;
FIG. 6 is a plan view of a wear part carrier forming part of the machine according to the present invention; and
FIG. 7 is a diagrammatic view of part of what is shown in FIG. 1, with various dimensions indicated, with reference to which the dimensions of the impeller are discussed below.
The impeller illustrated in the drawings is rotated about its vertical axis, and material to be comminut
REFERENCES:
patent: 3544014 (1970-12-01), Kampe
patent: 3767127 (1973-10-01), Wood
patent: 4738403 (1988-04-01), Sevelinge
patent: 4784339 (1988-11-01), Deffenbaugh
Impact Technology Limited
Rosenbaum Mark
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