A parabolic vibration-pulse mill for grinding material, which comprises a case with an outer cone and an inner cone arranged inside on a spherical support, with driving vibrator mounted on a shaft of said inner cone through a bearing, the cones being fitted with mantles having working surfaces forming a grinding chamber between them, wherein, in a lower section of the grinding chamber, working surface of each mantle being formed by parabola of generatrix with its concavity, in longitudinal cross-section, facing a mill longitudinal axis; and wherein, in a upper section of the grinding chamber, working surface of each mantle being formed by parabola of generatrix with its convexity, in longitudinal cross-section, facing a mill longitudinal axis, and wherein conjugation of said parabolas is smooth.

Moreover, the mill, wherein parabolas can be defined by the formula h=k.Math.r.sup.2/R, wherein h is the distance along an axis of the parabola, between a vertex of the parabola and circle formed by a cross section of the parabola, r is the radius of said circle, R is the radius of an sphere defined by the inner cone.

The mill with vertical distribution of material in the grinding chamber, providing a grinding ratio up to 30, with little wear of grinding mantles and low energy consumption.

A comminuting device (10) has a wear-resistant element (16) for partial insertion into a recess (26) in the surface of a wear area (12, 14). The wear-resistant element (16) has a fastening region (24), which can be connected to the recess (26) in the surface of the wear area (12, 14), and a wear region (22), which protrudes at least partially from the surface of the wear area (12, 14). The fastening region (24) is formed from a metal, the wear region (22) has a shell (18) and a core (20) arranged inside the shell (18). The core (20) is formed from a metal and the shell (18) is formed from a ceramic (20). The material of the shell comprises a ceramic which contains yttrium-stabilized, tetragonal polycrystalline zirconium oxide (TPZ). The TPZ has a proportion of the ceramic by volume of at least 60%, preferably at least 80%, in particular 95% to 100%.

A rotor protection plate for mounting on an upper plate of a rotor body of a crusher, in particular a vertical shaft impact crusher, is provided. The rotor protection plate comprises a body having an inner face defining a guide slot that is operably arranged to be in register with a rotor tip block opening defined on the upper plate of the rotor body and spaced apart therefrom to allow for a rotor tip block to be partly inserted into the guide slot during removal of the rotor tip block from, or insertion of the rotor tip block into, the rotor body.

A rotary material reduction tool includes a drum, a collar, and a hammer. The drum has an outer surface extending about a rotational axis of the drum. The drum has a first opening defined in the outer surface of the drum. The collar is received in the first opening. A first portion of the collar extends into the drum and a flange of the collar extends beyond the first opening and along the outer surface of the drum. The hammer extends through the collar and into the drum. The hammer has an exposed portion. The flange of the collar and the outer surface of the drum are welded together.

A compound blade assembly for recycling machines that process random sized waste metals into uniform reusable material. A rotating processing blade and a fixed registerable bed blade each have interchangeable blade teeth sets of multiple blade edge surfaces for interengaging target waste material at multiple shear points by registerable intermeshing in a linear progressive repetitive process.

The various embodiments disclosed and pictured illustrate a hammer for comminuting various materials. The embodiments pictured and described herein are primarily for use with a rotatable hammermill assembly. The hammer includes a connector end having a rod hole therein, a contact end for delivery of energy to the material to be comminuted, and a neck affixing the connector end to the contact end. The neck is formed with at least one neck recess therein. In other embodiments, one or more shoulders are positioned around the periphery of the rod hole for added strength. In still other embodiments, the contact end is configured with more than one contact surface.

An abrasion wear resistant distributor plate assembly is mountable to protect a rotor within a vertical shaft impact crusher for material fed into the rotor. A distributor plate is configured to be resistant to the operational abrasive wear resulting from contact with a flow of crushable feed material through the crusher rotor. Attachment components are provided around a perimeter of the plate to facilitate mounting and decoupling of the plate at the rotor during servicing or replacement procedures.

A chopping blade for cutting against a shear bar has a main body made of hardened steel. The blade body is formed with at least one cutting-edge region, a fastening region for fastening the blade to a carrier and in each case a transition region between the cutting-edge region and the fastening region. The main body bears a hard material coating in the cutting-edge region. The hardness of the main body is uniform throughout over all regions. A chopping drum carries a multiplicity of these chopping blades on its periphery and, upon rotation of the chopping drum, the chopping blades cut material upon running up against a stationary shear bar.

An abrasion resistant wear plate is mountable within a rotor or a vertical shaft impact crusher to protect the rotor from material fed into the rotor. The wear plate includes a main body that mounts and supports at least one abrasion resistant insert to define, in part, a contact face over which feed material is configured to flow.

The present invention provides a wear element assembly comprising: (i) a wear element comprising an aperture adapted to receive a fastener, the aperture having a tapered upper region, (ii) a fastener comprising a head region, and a threaded region distal to head region, the head region of the fastener being tapered so as to frictionally engage with the tapered upper region of the aperture, wherein, in use, the threaded region of the fastener is inserted into the aperture and an underlying substrate to locate the wear element on the substrate, and a nut is wound onto the threaded region to secure the wear element to the substrate.