Guard housing and liner for bladed centrifugal blasting wheels

A guard housing and lining for a bladed wheel whereby particulate material is thrown by centrifugal force from the ends of the blades onto a surface below the wheel including a base on which the wheel is mounted with an opening through the base in alignment with the blades of the wheel for projection of particulate material therethrough onto the surface to be treated, said wheel being supported for rotational movement on a hub extending axially into engagement with one side of the wheel and means for feeding particulate material from a feed spout communicating with an axial opening at the other side of the wheel, said guard housing and lining comprising a trapezoidal section open at the bottom and at the top with a larger opening at the bottom in which the trapezoidal section is formed of vertically disposed front and back walls and inclined end walls spaced one from the other by an amount greater than the respective width and length of the bladed wheel, means mounting the trapezoidal section of the housing onto the base with the open botton in registry with the opening through the base plate, a cover having laterally spaced apart front and back side walls and inclined end walls spaced one from the other by an amount corresponding to the spaced relation of the side and end walls of the trapezoidal section at their right ends so that the cover fits onto the open top of the trapezoidal section, and a top wall enclosing the upper end of the cover, a pivotal connection between at least one of the end walls of the cover and the corresponding end wall of the trapezoidal section to enable the cover to be rocked between open and closed positions and including means for disengagement of the pivotal connection to enable removal of the cover from the trapezoidal section, and plates of lining material supported by the guard housing for lining the interior surface thereof, in which the lining is formed of sections consisting of a lower side wall lining formed of a pair of lower side wall sections for each side wall and means for securing the lower side wall sections to the adjacent side wall of the trapezoidal section of the guard housing, a pair of end wall sections spanning the space between the ends of the side wall sections and means for blocking movement of the end wall sections from their assembled relation, a top section which spans the space between the upper ends of the end wall sections, and an upper side wall section for each side wall filling the space between the upper edges of the lower side wall sections and the top section, and means operatively engaging the top wall section to hold down the top wall section when the cover is in closed position.