Abstract: The invention is an improvement on existing crushers that allows a significant reduction in the operating cost of said crushers while allowing, among other things, a substantial economy in the material from which the rotor protection elements of said crushers are manufactured. A subject of the invention is a protection block for a rotor of a material crusher, particularly the rotors of scrap metal crushers, comprising a first piece or armouring plate (2.2) itself comprising, detachably or non-detachably fixed on its inner face, a first fixing means (2.3), and a second piece, independent of the first piece, forming a second fixing means (2.4).

Abstract: A subject of the invention is an ejection door for the casing of a material crusher, particularly for a scrap metal crusher, characterized in that it comprises at least one aperture of defined dimensions, cut right through along the transversal axis of said door, at least one deflector positioned on the internal surface of the ejection door forming a predefined acute angle of attack with said ejection door and optionally at least two side walls, arranged on each side of the aperture, perpendicular to the ejection door and on which the deflector is supported.

Abstract: The field of the invention is the recovery and recycling of materials, particularly the recycling of tyres. It relates particularly to a device for cleaning metal fibres comprising at least 2 coaxial cones, one fixed and one mobile in rotation, and means of moving said mobile cone.

Abstract: A subject of the invention is an ejection door for the casing of a material crusher, particularly for a scrap metal crusher, characterized in that it comprises at least one aperture of defined dimensions, cut right through along the transversal axis of said door, at least one deflector positioned on the internal surface of the ejection door forming a predefined acute angle of attack with said ejection door and optionally at least two side walls, arranged on each side of the aperture, perpendicular to the ejection door and on which the deflector is supported.