A wear-resistant element for partially inserting into a recess in the surface of a wear surface of a comminuting device. The wear-resistant element has a fastening region, which is connectable to the recess in the surface of the wear surface and a wearing region, which protrudes at least partially from the surface of the wear surface. The fastening region includes a material that is less wear-resistant than the material of the wearing region, wherein the wearing region extends beyond the fastening region at the level of the wear-resistant element.

An apparatus for grinding particulate material having a roller press having a pair of grinding rollers each having a rotation axis and being arranged oppositely and parallel to define a grinding roller gap in a common plane through the axes of the rollers, and a mechanical conveying device for conveying granular material to the roller press having a proximal end and a distal end relative to the roller press, the roller press being arranged at the proximal end of the conveying device. The conveying device is arranged to constrain a flow or mat of the granular material having in a cross sectional view a rectangular shape with a mid-plane and to transfer the flow or mat of granular material directly to the grinding roller gap of the roller press in a linear transfer plane being coincident with the mid-plane and perpendicular to the common plane through the axes of the rollers.

A roller for a roller press has a core formed with axially opposite outer ends, an axially central passage, and axially spaced and radially extending inlet and outlet passages extending radially at the outer ends from the central passage and opening radially outward at an outer surface of the core. A coolable jacket surrounds the core, and respective manifold rings are mounted on outer ends of the core, cover inlet and outlet passages at the end faces of the jacket. Respective L-shaped connecting passages each have an axially extending segment opening into a respective one of the cooling passages of the jacket and a radially extending segment opening into the respective groove.

The invention relates to a roller crusher having two generally parallel rollers arranged to rotate in opposite directions, towards each other, and separated by a gap, each roller having a first end and a second end. The roller crusher comprises a flange attached to at least one of said ends of one of said rollers. The flange extending in a radial direction of said roller, and has a height above an outer surface of said roller which is sufficient to extend across said gap substantially along a nip angle of said roller crusher.

The present invention relates to a crushing roll for a roll-type crusher has a shaft with at least one groove extending in the axial direction on its lateral surface, to receive formed elements. The formed elements serve to retain the crushing shells, for which purpose the formed elements form a form-interlockingly engaging combination with the groove in the shaft, in the radial direction. A form-interlockingly engaging combination in the radial direction is understood here to signify means of blocking of movement of the formed elements in the radial direction of the shaft. In this way, it is possible to anchor the crushing shells in the grooves by means of the formed elements. Advantageously, also axial forces from the crushing shells can be transmitted to the shaft via the formed elements in the grooves, which forces can thereby be borne by the shaft, given that a high pressing force can be transmitted via the combination of a crushing shell and formed element, resulting in high holding friction between the molded element and the shaft.

The present invention relates to a machine frame for a roll crusher that has two side walls and two end walls, where the mentioned end walls accommodate the storage of the rolls. The end walls are split horizontally in the area of the mounting of the rollers, and vertically between the mountings of the upper part. One advantage is that to remove a roller, removal of the respective upper end wall is sufficient. In a preferred embodiment of the invention, the adjacent upper parts of the end walls do not touch. An advantage of this is that tilting of the end wall upper parts among each other or in contact with the side walls is prevented during removal. Furthermore, the gap resulting from the distance between the front wall upper parts in the preferred embodiment would be sealed, with the advantage that no material and dust can exit.

The present invention relates to a wear-resistant hard body that includes, at least partially, a high-strength, iron-based alloy, and preferably includes an external shell or sleeve made of another material. The hard body can be made by casting a molten iron-based alloy into the shell or the sleeve. The iron-based alloy can be an FeCrMoVC alloy. The shell or sleeve can be made of steel, copper, or a copper alloy. Methods for producing the wear-resistant hard body or for producing hard bodies or side-wear protection elements for a roller of a roller press are also disclosed. A roller for a roller press that includes at least one wear-resistant hardy body as described herein is also disclosed.

A friction stir welding tool comprising a composite of a tungsten-rhenium alloy and hafnium carbide particles, wherein a crystallite size of the tungsten-rhenium alloy is no more than 100 nm, wherein the hafnium carbide particles are dispersed within the tungsten-rhenium alloy, a method of fabricating the friction stir welding tool, and a method of friction stir welding a metal joint using the tool. Various embodiments of the friction stir welding tool, the method of fabricating the tool, and the method of friction stir welding using the tool are provided.

To produce flour and/or semolina, raw material is fed into a feed opening of a roller press. The milling gap of the roller press is fixed, or damping of at least one of the rollers with respect to the lateral deflection is set, such that a first subset of the fill containing finer milling material forms a packed particle fill in the milling gap. In addition, the setting is carried out in such a way that individual particles of a second subset of the fill containing coarser milling material are in contact with the first roller and the second roller of the roller press. Subsequently, the bulk material is milled into milled product in the roller press (9) and the milled product is discharged through a discharge opening.

The invention relates to a dual-roller crusher (1) with rollers (2, 3) rotatably mounted in a crusher housing and are driven by a motor so as to counter-rotate synchronously about respective parallel center axes, crusher teeth (6, 7) being mounted on the outer surfaces of the rollers (2, 3), every crusher tooth (6, 7) of a roller (2, 3) of the pair of rollers being fittable into a respective pocket (8, 9) in the outer surface of the other roller (2, 3) of the pair of rollers such that, during rotation of the rollers (2, 3), each crusher tooth (6, 7) engages in the respective pocket (8, 9).