Replaceable liner for the discharge assembly of a rotary grinding mill or the like

In a discharge assembly adapted to be mounted inside the discharge end of a rotary grinding mill or the like comprising at least first and second contiguous discharge castings extending circumferencially of the grinding mill or the like, with the first discharge casting including a grate provided with passages and the second discharge casting including a wear plate, with the first and second discharge castings, the grate, and the wear plate defining a discharge chamber, the improvement comprising replaceable liner for insertion into the discharge castings, comprising, in combination:

• at least first and second, self-supporting box members;
• with the first box member including a first closed side, a second closed side, a first open end, a second closed end, an open top, and a closed bottom;
• with the second box member including a first closed side having an inside surface and an outside surface, a second closed side having an inside surface and an outside surface, a first open end, a second open end, a closed top having an inside surface and an outside surface, and a closed bottom having an inside surface and an outside surface;
• with the second box member having a shape complementary to the shape of the second discharge casting, allowing insertion within the first discharge casting when the grate is removed and into the second discharge casting, and preventing movement of the second box member in the second discharge casting in a first direction, and the first box member having a shape complementary to the first discharge casting, allowing placement within the first discharge casting and preventing movement of the second box member in the second discharge casting in a second direction, for capturing the first and second box members within the first and second discharge castings when the grate is attached to the first discharge casting.