Distributor plate
A distributor plate ( 10 ) is shown for use in an impelling rotor of a vertical shaft impactor ( 14 ). Typically the impelling rotor is a chamber ( 12 ) arranged to rotate about a vertical axis A-A. Feed materials for breakage are gravity-fed into the rotating chamber ( 12 ). These materials strike the rotating distributor plate ( 10 ) which is located at the base of the rotor chamber ( 12 ). The plate has a substantially planar single-piece upper surface ( 24 ) onto which the feed materials are received. This substantially flat surface ( 24 ) facilitates rapid and easy expulsion of feed materials there across and out of the rotor chamber ( 12 ). The plate shown is a circular disc made of metal carbide. Use of a single-piece upper surface of the distributor plate ( 10 ) also will not result in the development of preferential wear sites at corners, edges, join lines etc, as can happen with the known distributor plates.
1. A mounting plate for supporting a distributor plate in an impelling rotor of a rotating shaft impactor, where the impelling rotor is a chamber arranged in use to rotate about an axis and to radially eject materials received therein through one or more ejection ports in a side wall of the chamber, the distributor plate having a multi-sided basal spigot, the mounting plate comprising: at least one recessed bolt hole for attaching the mounting plate to a base plate of the impelling rotor, and a polygonal central recess for receiving the multi-sided basal spigot, wherein the number of sides of the polygonal recess is a multiple greater than the number of sides of the basal spigot.
2. A mounting plate as claimed in claim 1 wherein the recess is a twelve-pointed star shaped hole having twenty four sides and the basal spigot has six sides.
3. An impelling rotor of a rotating shaft impactor, where the impelling rotor is a chamber arranged in use to rotate about an axis and to radially eject materials received therein through one or more ejection ports in a side wall of the chamber, the impelling rotor comprising:
a distributor plate having a multi-sided basal spigot;
a base plate; and
a mounting plate for supporting a distributor plate, the mounting plate comprising: at least one recessed bolt hole for attaching the mounting plate to the base plate, and a polygonal central recess for receiving the multi-sided basal spigot, wherein the number of sides of the polygonal recess is a multiple greater than the number of sides of the basal spigot.
4. A rotating shaft impactor comprising:
an impelling rotor, where the impelling rotor is a chamber arranged in use to rotate about an axis and to radially eject materials received therein through one or more ejection ports in a side wall of the chamber, the impelling rotor comprising:
a distributor plate having a multi-sided basal spigot;
a base plate; and
a mounting plate for supporting a distributor plate, the mounting plate comprising:
at least one recessed bolt hole for attaching the mounting plate to the base plate, and a polygonal central recess for receiving the multi-sided basal spigot, wherein the number of sides of the polygonal recess is a multiple greater than the number of sides of the basal spigot.
5. A mounting as claimed in claim 1 , wherein the distributor plate includes a wear element positioned on a body, the wear element being spaced from the body by one or more spacers arranged between facing surfaces of the body and the wear element so that, when the element is attached to the body by use of an adhesive substance, the spacer(s) allow for a predetermined depth of the adhesive substance between the body and the wear element.
6. A mounting as claimed in claim 1 , wherein at least part of a peripheral edge of the distributor plate is beveled for the insertion of a levering tool to facilitate movement of the distributor plate.
7. A mounting as claimed in claim 1 , wherein the distributor plate includes a single wear element positioned on a body to alone cover an outer surface of the body and either of an opposing surface of the body or the wear element includes a projection which locates the wear element on the body.
8. A mounting as claimed in claim 7 wherein the projection is located at the edge of the body and around its periphery.