A crop processor for cracking kernels in a forage harvester, the crop processor including: a housing having an inlet and an outlet; and a first and a second comminuting roll mounted inside the housing, the comminuting rolls being arranged in parallel to define an opening between the rolls, the comminuting rolls being configured to rotate, during use, in opposing rotation directions to transport a flow of harvested crop, received from the inlet, through the opening towards the outlet, wherein the first comminuting roll is configured to rotate at a greater speed than the second comminuting roll; wherein the first and second comminuting rolls each include a plurality of teeth arranged on a circumferential surface of the comminuting roll, each of the plurality of teeth includes a leading edge which faces in the rotation direction of that comminuting roll.

A roll for a roller press suitable for comminution of granular material by interparticle crushing. The roll comprising a cylindrical body having an outer cylindrical pressing surface for use with an opposing roll in an interparticle crushing pressing nip and a plurality of outwardly extending wear-resistant surface studs positioned on the pressing surface. A strip element is provided on the outer cylindrical pressing surface of the cylindrical body.

A wear-resistant element is configured to be mounted on a comminuting device or a silo. The wear-resistant element may be formed from a ceramic that comprises yttrium-stabilized, tetragonal polycrystalline zirconia (TPZ). The TPZ makes up a proportion of the ceramic of at least 60% by volume, in some cases at least 80%, or even 95% to 100%. The ceramic may have a porosity of less than 5%. The ceramic may have a ratio of monoclinic to tetragonal zirconia of 10% to 40%. An yttrium-stabilized zirconia of the ceramic may have a grain size D50 of less than 1.5 μm. The ceramic may have an yttrium content of 2 to 4 mol % Y2O3.

A wear-resistant element can be partially inserted into a recess in a surface of a wear area of a comminuting device. The wear-resistant element has a fastening region that can be connected to the recess in the surface of the wear area. The wear-resistant element may also include a wear region that protrudes at least partially from the surface of the wear area. The fastening region may comprise metal. The wear region has a shell and a core arranged inside the shell. The core is comprised of metal, and the shell is comprised of ceramic. The ceramic contains yttrium-stabilized, tetragonal polycrystalline zirconium oxide (TPZ). The TPZ makes up at least 60% by volume of the ceramic in the shell.

A grinding roll including a roll body having a cylindrical outer surface extending axially between a pair of opposite ends and a side groove formed at each end of the roll body. The side groove includes a support shoulder recessed from the cylindrical outer surface and/or from surfaces of the opposite ends of the roll body. The grinding roll includes an edge ring including a plurality of spaced receiving cavities and a plurality of wear members. Each wear member is received and retained in at least one of the receiving cavities of the edge ring. The wear members are positioned along the edge ring to define an edge of the grinding roll, and the edge ring is received within each side groove. The wear members are arranged to provide a wear protecting surface which is angled in relation to the cylindrical outer surface of the roll body. The angled wear protecting surface prevents excessive build-up of material on the grinding roll and reduces the need for maintenance.

A grinding roll including a roll body having a cylindrical outer surface extending axially between a first end and a second end and a flange attached to at least one of the first and second ends. The flange includes an outer edge that extends radially past the cylindrical outer surface of the roll body. A first surface of the flange forms a perpendicular continuing surface with the cylindrical outer surface of the roll body. A second surface of the flange forms a continuation of one of the first and second ends of the roll body. The flange includes wear protection liner elements on the first surface. The first surface of the flange includes at least one lower part adjacent the cylindrical outer surface of the roll body and at least one upper part adjacent the outer edge of the flange. The lower part includes a first type of wear protection liner elements and the upper part includes a second type of wear protection liner elements. The average covering area of the second type of wear protection liner elements is larger than that of the first type of wear protection liner elements.

A grinding roll including a roll body having a cylindrical outer surface extending axially between a first end and a second end and a flange attached to at least one of the first and second ends. The flange includes an outer edge that extends radially past the cylindrical outer surface of the roll body. A first surface of the flange forms a perpendicular continuing surface with the cylindrical outer surface of the roll body. A second surface of the flange forms a continuation of one of the first and second ends of the roll body. The flange includes wear protection liner elements on the first surface. The first surface of the flange includes at least one lower part adjacent the cylindrical outer surface of the roll body and at least one upper part adjacent the outer edge of the flange. The lower part includes a first type of wear protection liner elements and the upper part includes a second type of wear protection liner elements. The average covering area of the second type of wear protection liner elements is larger than that of the first type of wear protection liner elements.

The invention relates to a wear-resistant roller (1) for crushing of particulate material, such as crude ore for use in the cement or minerals industry comprising a roller body (2), a wear surface (3) on the roller body (2) having an axial extension in an axial direction of the roller and a radial extension in a radial direction of the roller, the wear surface (3) comprising a primary fraction of matrix material and a secondary fraction of hard phase material suspended in the matrix material, wherein the secondary fraction of hard phase material in a central portion of the wear surface is higher than the secondary fraction of hard phase material in a peripheral portion of the wear surface seen in the axial direction of the roller. Also the invention relates to a method of forming such a wear surface on a roller body.

A roller comprising a roller body (2) on which a plurality of ribs (4) are arranged, wherein each of the ribs (4) are formed of a number of protrusions (5) which are disposed continually in a direction of the roller shaft, the protrusions (5) are made from materials having a high wear-resisting property. This arrangement not only improve the primary yield of finished products, but also increase the lifetime and wear-resisting property, thereby the primary yield of finished products in present invention is up to 22%-30%, and the lifetime of the roller is up to 15,000-20,000 hours, further the wear loss of the stud is only 2.5 mm per 2,100 hours.

The invention relates to a press roll (1) for a roll press, in particular for comminuting highly abrasive materials, comprising a roll body (2) which has a plurality of pocket-like recesses (3) that are distributed over the circumference and are spaced from one another in the circumferential direction (T) on one or both roll edges, each said recess being formed so as to be open laterally and at the top. Only one hard body is removably inserted into each individual pocket-like recess (3) as an exchangeable edge protection element (5), and the length (L) of the pocket-like recesses (3) and the length (I) of the inserted edge protection elements (5) in the circumferential direction (T) is greater than the distance (A) between two directly adjacent recesses (3).