Abstract: A rotor of a vertical shaft rock crusher is balanced by steel balls in a circular tube attached to the rotor. Ports in the rotor are protected by tungsten carbide pins encased in iron pipes at the top, bottom, and trailing lips of the ports. The pins at the top and bottom of the ports are welded to a mounting plate which is clamped in the rotor over each port. The lip pin at the trailing lip, which has a shorter life than the other pins, is held in a seat in the rotor by the mounting plate. Therefore, the lip pin may be individually replaced. A safety pin welded to the mounting plate is next to the lip pin to protect the rotor between the time the lip pin fails and is replaced.

Abstract: The rotor of a vertical shaft impact rock crusher is balanced by placing steel balls in a hollow ring attached around the top of the rotor. The vanes within the impeller are constructed to form rock shields on the forward or impact side of the vanes. Rocks are fed into the impeller upon a free floating table. The top of the free floating table is protected by a tungsten carbide disc. Therefore the rocks are moved from the table at reduced rotational velocity less than that of the rotor and are struck by the rapidly rotating rock faces of the rock shield. Ports are placed close to the trailing or back side of the vanes. The top, bottom, and trailing lip of the ports are protected by tungsten carbide pins which are adhered within steel pipes by epoxy. The pins are mounted upon a door by welding to the door which covers the ports. The door may be replaced for ease and rapidity in replacing the pins. The pin along the trailing lip of each port is supported by a seat of weld metal.