A base and ring assembly for a grinding mill includes a base structure with a support plate, an annular support-ring fixedly secured to and positioned above the support plate. The support-ring has a radially inward facing convex surface that extends from a support-ring lower axial end to a support-ring upper axial end. The assembly includes an annular grinding-ring that has a radially outward facing concave surface which extends from a grinding-ring lower axial end to a grinding-ring upper axial end. The grinding ring has a radially inward facing grinding surface. The radially outward facing concave surface is complementary in shape to and engages the radially inward facing convex surface.

A base and ring assembly for a grinding mill includes a base structure with a support plate, an annular support-ring fixedly secured to and positioned above the support plate. The support-ring has a radially inward facing convex surface that extends from a support-ring lower axial end to a support-ring upper axial end. The assembly includes an annular grinding-ring that has a radially outward facing concave surface which extends from a grinding-ring lower axial end to a grinding-ring upper axial end. The grinding ring has a radially inward facing grinding surface. The radially outward facing concave surface is complementary in shape to and engages the radially inward facing convex surface.

A method of upgrading a vertical spindle pulverizer includes the steps of removing a cover from a journal opening in a housing of the pulverizer to access a grinding zone of the pulverizer, removing a first journal assembly having a toroidal grinding roll from the pulverizer through the journal opening, removing a plurality of toroidal table segments from a grinding table of the pulverizer, installing a plurality of inclined bull ring segments on the grinding table, installing a second journal assembly having a conical grinding roll in the pulverizer, and replacing the cover over the journal opening. The inclined bull ring segments are configured to register with a grinding surface of the conical grinding roll.

The invention relates to a replaceable key grinding pan segment for a grinding track of a grinding pan of a roller mill, the grinding track having an annular shape with an outer circumference and an inner circumference around a center point. The length of the inner edge of the key grinding pan segment closer to the center point is greater here than the length of the outer edge further from the center point. The invention also relates to a grinding pan segment system, a roller mill, and a method for replacing grinding pan segments.

A mill for crushing a bed of materials by compression includes: a horizontal-axis cylinder the interior wall having a runway track for a crushing roller placed inside the cylinder, a unit rotating the cylinder at a speed that spins the material outward, the crushing roller, a unit for pressing the crushing roller against the runway track of the cylinder, an inlet for supplying material for crushing at one end of the cylinder and an outlet for crushed material at the other end, a unit for controlling the movement of the material so it travels over only a fraction of the length of the cylinder in each revolution and passes between the cylinder and the roller several times before reaching the outlet. The runway track is followed by a downstream lip opposing material flow, downstream of the crushing roller in the direction in which the material travels.

A vertical roller mill with segmented bull ring and clamping system includes a roller mill base having an internal taper configured for holding a bull ring in grinding position, a cowring dimensioned to be fitted into the internal taper of the base and a clamp ring secured atop the cowring. Each of these has a plurality of apertures spaced and configured so that when fastened together with fasteners, they form a radial landing platform for a plurality of segmented bull ring bricks. The system also includes a plurality of segmented bull ring bricks which, when clamped to the radial landing platform and taken as a whole, form a solid, but readily separable, segmented bull ring suitable for use in a roller mill. The system further includes wedge blocks and fasteners for individually removably clamping the segmented bull ring bricks to the radial landing platform.

A vertical roller mill with segmented bull ring and clamping system includes a roller mill base having an internal taper configured for holding a bull ring in grinding position, a cowring dimensioned to be fitted into the internal taper of the base and a clamp ring secured atop the cowring. Each of these has a plurality of apertures spaced and configured so that when fastened together with fasteners, they form a radial landing platform for a plurality of segmented bull ring bricks. The system also includes a plurality of segmented bull ring bricks which, when clamped to the radial landing platform and taken as a whole, form a solid, but readily separable, segmented bull ring suitable for use in a roller mill. The system further includes wedge blocks and fasteners for individually removably clamping the segmented bull ring bricks to the radial landing platform.

There is provided an apparatus and method for comminuting a material. The apparatus may comprise a chamber and an inner surface with a plurality of protrusions, and a hammer positioned within said chamber comprising an outer surface having a plurality of second protrusions configured to engage with the first protrusions. The outer and inner surfaces may be separated by a gap distance which defines a comminution zone. The anvil may be rotated to cause a material to be comminuted as the material passes through the comminution zone.

The present invention relates to a method for improving the productivity of grinding plants, wherein, after the optimum wear geometry of the grinding units has been reached by conventional operation of the grinding plant, the optimum wear geometry is preserved by applying a thin wear protection layer to the surface of the grinding units.

A method of upgrading a vertical spindle pulverizer includes the steps of removing a cover from a journal opening in a housing of the pulverizer to access a grinding zone of the pulverizer, removing a first journal assembly having a toroidal grinding roll from the pulverizer through the journal opening, removing a plurality of toroidal table segments from a grinding table of the pulverizer, installing a plurality of inclined bull ring segments on the grinding table, installing a second journal assembly having a conical grinding roll in the pulverizer, and replacing the cover over the journal opening. The inclined bull ring segments are configured to register with a grinding surface of the conical grinding roll.