Abstract: A beater bar capable of being acted upon on one side for impactor rotors and insertable form-fittedly into circumferential slots of the rotors has a bend with an elongate cross-section, a bearing surface heldable counter to a centrifugal force of the rotating rotors against a bearing surface of the rotors, a supporting surface engageable with an undercut in the circumferential slot; a piece which holds the beater bar in engagement with the undercut in an circumferential slot, the bend being arcuate, and a center of rotation of a smaller radius of an arc of the bearing surfaces being at a considerable distance from a center of rotation of a larger radius of an arc of the supporting surface, so that the two centers of rotation run in a line extending approximately parallel to a beating surface, the bearing surfaces being at an obtuse angle to one another in a prolongation of the smaller arc.

Abstract: A beater bar capable of being acted upon on one side for impactor rotors and insertable form-fittedly into circumferential slots of the rotors has a bend with an elongate cross-section, a bearing surface heldable counter to a centrifugal force of the rotating rotors against a bearing surface of the rotors, a supporting surface engageable with an undercut in the circumferential slot; a piece which holds the beater bar in engagement with the undercut in an circumferential slot, the bend being arcuate, and a center of rotation of a smaller radius of an arc of the bearing surfaces being at a considerable distance from a center of rotation of a larger radius of an arc of the supporting surface, so that the two centers of rotation run in a line extending approximately parallel to a beating surface, the bearing surfaces being at an obtuse angle to one another in a prolongation of the smaller arc.

Abstract: A rotor of the closed type for impactors, produced from cast steel, as a casing and the rotor discs carrying this area cast in one piece, the rotor casing being of essentially single-walled design, and the circumferential slots for receiving the beater bars being provided in the cast body itself. Alternatively to this, the rotor casing may be subdivided into shells which are connected outside the circumferential slots by means of longitudinal weld seams to form a closed rotor casing, the rotor casing likewise being connected to the rotor discs carrying the latter by means of weld seams.

Abstract: The invention concerns blow bar 1 for impactor rotors with a mirror-symmetrical longitudinal cross-section for the purpose of reversibility, which is fitted in peripheral recesses 17 of the rotor advantageously comprising discs 16. According to the invention, the cross-section of blow bar 1 essentially forms a basic double trapezium shape with the wide bases of each trapezium as symmetrical axis 2. The rear 5 of the blow bar corresponding to the height of each trapezium is arranged at rightangles to the symmetrical axis and forms a level surface 6 over the total height of the blow bar. The invention also specifies an advantageous rotor for such a blow bar, Fig.

Abstract: The invention relates to a rotor 1 for impactors, comprising a plurality of cast steel rotor discs 2, welded together at their widened flanges 3 that are touching one another and which feature a widened outer rim 4, which is interrupted by peripheral recesses 5 to accommodate blow bars. For improved accessibility to the retaining pieces 16 holding the blow bars in the blow bar holders, provision according to the invention is made for the sides of the partial sections 7 of the outer rims 4 to be tapered circumferentially in the direction opposite to the rotation direction of the rotor.

Abstract: The invention concerns an impact crusher 1 with a rotor 3 equipped with blow bars 4 and pivotably-mounted impact aprons 5, 6 arranged in the crusher housing 2, the impact aprons are positionable vis a vis the rotor by means of hydraulic cylinder-piston units 7 via piston rods 8. In a prior art impact crusher, additional mechanical devices are provided locally alongside the hydraulic retaining and positioning device 7, 9 to prevent the impact aprons 5 dropping into the tip circle circumscribed by the blow bars 4 of the rotors 3 in case of failure of the hydraulics. The invention provides additional devices connected to the corresponding hydraulically-actuatable retaining and positioning device 7, 9, using the latter's piston reds 8 to form homogeneous units 12.

Abstract: A rotor for use in an impact crusher or in a hammer mill is assembled of two or more coaxial metallic discs having neighboring hubs and axially spaced apart radially outermost portions which define annular clearances for introduction of a welding implement. Such implement is used to apply annular welded seams which bond the ends of the hubs to each other. The welded seams are provided at the peripheral surfaces of the hubs. The hubs are mechanically coupled to each other by bolts prior to making of the welded seams. The radially outermost portions of the discs are thereupon connected with hammers or beater bars, depending on the intended use of the rotor.

Abstract: A rotor (1) for impact or hammer mills is formed out of several rotor disks (1) made of cast steel and welded together, where the rotor disks exhibit hubs (3) contacting each other at annular sections representing the longest extension of the rotors in an axial direction. The rotor disks are connected to each other by annular weld seams at the hubs. According to a further embodiment of this rotor, the turn-outs (17), furnished for the weld seams (9) at the front faces of the hubs (3), extend from the outer edges over a substantial part of the radial thickness of the hubs, and the weld seam grooves (16), formed by the turn-outs of the neighboring rotor disks, are filled with welding materials.

Abstract: A rotor which is to be used in an impact crusher has a set of coaxial discs with radially inwardly extending peripheral recesses for elongated beater bars which are parallel to the rotor axis and each of which extends into a discrete recess of each disc. The beater bars have male or female detent elements which cooperate with complementary female or male detent elements of the discs at the rear sides of the beater bars to prevent radially outward movements of the beater bars in actual use of the rotor. The front sides of the beater bars are engaged by wedges which are biased radially outwardly against the beater bars and against the respective discs by fluid-operated thrust elements in the recesses of the discs. Each thrust element has a piston rod which bears against the respective wedge and urges the wedge radially outwardly in the respective recess, and each thrust element reacts against an elongated rail which is installed in the deepmost portions of a set of aligned recesses of the discs.