Abstract: When material is thrown in a hopper, material of small particle diameter is loaded in between breaking teeth on two rotors and transferred toward a crushing space between the rotors by rotation. The material of small particle diameter is pressed by compression teeth on one rotor against cutting teeth on the other rotor, thereby causing compressive crushing. When material of small particle diameter clogs the crushing space and stays therein, the cutting teeth cut the material to form a gap. The breaking teeth on the two rotors move odd-shaped material or the like toward the crushing space by similar action. Consequently, the odd-shaped material assumes such a posture that it is caught between the breaking teeth, and is crushed by the breaking teeth or cut by the wedge effect.

Abstract: When material is thrown in a hopper, material of small particle diameter is loaded in between breaking teeth on two rotors and transferred toward a crushing space between the rotors by rotation. The material of small particle diameter is pressed by compression teeth on one rotor against cutting teeth on the other rotor, thereby causing compressive crushing. When material of small particle diameter clogs the crushing space and stays therein, the cutting teeth cut the material to form a gap. The breaking teeth on the two rotors move odd-shaped material or the like toward the crushing space by similar action. Consequently, the odd-shaped material assumes such a posture that it is caught between the breaking teeth, and is crushed by the breaking teeth or cut by the wedge effect.

Abstract: A multiaxes roll type of crusher comprises four rolls. The four rolls respectively have teeth for directly crushing materials. There would be virtually 6 pairs of rolls in mathematically. There are really at least three relations given for crushing. Raw materials are crushed with a first crushing-relation to be of smaller size. Such crushed materials are secondly crushed with a second crushing-relation and a third crushing-relation to be of still smaller size. The first roll and the second roll can rotate in reversely opposite directions. The third roll and the fourth roll can rotate in reversely opposite directions. The reverse rotations cancel the crushing-relations. The flow of the crushed materials are controlled by a flow controlling means, which opens and closes the path between the third roll and the fourth roll. The opened flow controlling means does not obstruct the flow of foreign materials between the third roll and the fourth roll.

Abstract: A combination of anvils in a vertical shaft-type impact crusher with deadstock spaces enables the extension of life of the tips mounted on a rotor. A combination of hard tips with softer tips overcomes the inconsistency in which the hard tips that are prone to wear by chipping but are erosive resistant to collision with stones of a large grain size accelerated by the rotor, while the softer tips are resistant to chipping-wear but are ordinarily prone to erode by collision with stones of a smaller grain size accelerated by the rotor. Crushers having anvils and dead stock spaces, have pairs of symmetrically arranged hard tips and softer tips mounted on a reversibly rotatable rotor. The pairs of tips are located in symmetry with respect to each of a number of angularly related centerlines extending radially from the rotational axis of the rotor.

Abstract: A rotor blade structure for a vertical shaft impact crusher which enables the lifetime of blades to increase and facilitates maintenance. In the early stage of wear, it takes place by collision between a blade body (2) of each blade (1), particularly teeth (4) provided thereon, and raw stone. Accordingly, in this stage, rods (9) buried in the blade body (2) do not collide with raw stone. As the wear progresses, the rods (9) become exposed. After the rods (9) have been exposed, raw stone also collides with the rods (9), which have a higher hardness than that of the blade body (2). That is, the blade (1) does not subject the rods (9) to wear from the beginning of use of it, but allows the rods (9) to be subjected to wear after the blade body (2) has become worn to a certain extent.

Abstract: A vertical shaft impact crusher including a housing, a vertical rotating shaft (11) rotatably provided in the housing and rotated at a high speed, a rotor (10) provided on the upper end of the vertical rotating shaft (11) to discharge centrifugally an object of crushing, which is cast into the housing, to the outer periphery thereof, and an anvil support frame (60) disposed in the housing to surround the outer periphery of the rotor (10) and provided with anvils (18) for collision with the object of crushing discharged from the rotor (10). The anvil support frame (60) is movable up and down in a direction parallel to the central axis of the vertical rotating shaft (11).

Abstract: A centrifugal refining crusher for simultaneously crushing and refining feed material in which the feed material such as ores and rocks is thrown out into housing around rotor making use of the centrifugal force created by the rotation of the rotor. A further second rotor is provided under an opening for dropping the feed material formed in between the first housing and the first rotor, a second housing is provided around the second rotor, anvils are provided on the first housing mainly to crush the feed material, and a deadstock portion is formed by the material in the second housing mainly to refine grain shape of the broken feed material.