Abstract: A gyratory crusher comprises a body and an annular outer shell, which is fixedly connected to the body about an essentially vertical center axis. A shaft member is arranged radially inside the outer shell to perform, during crushing, a swinging movement about the center axis. A crushing chamber forms between the outer shell and an annual inner shell arranged on the shaft member. A piston member is displaceable along the center axis and is arranged in a cylinder member belonging to the body. The upper end of the piston member supports, via an intermediate thrust bearing, a lower end of the shaft member. A transport duct for supplying to the thrust bearing a medium promoting the bearing function extends through the piston member and is defined upstream of the piston member by a transfer means. At least a part of the transfer means is displaceable relative to the piston member and at least a part is displaceable relative to the cylinder member.

Abstract: A device for disintegration of material comprises at least one first axle (2) having first processing members (5) arranged to actuate material, on rotation of the axle, in an axial direction towards second processing members (7) for disintegration of the material. In addition, the axle is provided with members (10) arranged to actuate and tend to convey, on rotation of the axle, material transversely to the axle.

Abstract: A vibrating screen for the sizing of granular material such as gravel, sand, crushed stone, etc., having a frame (1) and a screen body (2) supported on springs (6), directional oscillating movements being imparted to the screen body by a motor powered vibrator mechanism (3). The screen has two or more screen decks (11-13), each one divided into three component screens (14a-c, 15a-c, 16a-c) having successively decreasing inclinations in a direction towards the discharge end (9) of the screen, each lower screen deck furthermore having an increased inclination in relation to the nearest deck above.

Abstract: A gyratory crusher has two crushing shells (4, 5) defining between them a crushing gap (6). In operation, the crushing gap is adjusted as a function of the determined crushing-shell wear calculated on the basis of reference data on the established rate of wear of the crushing shells (4, 5) in previous crushing operations involving the same or a similar raw material. To adjust the particle size distribution of the crushed goods and obtain the desired particle size distribution curve, the crusher is operated with brief periods of alternatingly different settings of the width of the crushing gap (6) and/or with alternating crushing power or crushing force.

Abstract: The object of the invention is a cone crusher comprising a shaft mounted in a frame for oscillating movement, and a rotor which is rotatably mounted on the shaft and adapted to be rotated on the shaft by means of a drive and which has an out-of-balance weight so that the rotation of the rotor in conjunction with centrifugal force sets the shaft in gyratory oscillating motion, while a conical crusher head carried by the shaft is caused to roll on the inner side of a crushing mantle carried by the frame. Characteristic of the invention is that the cone crusher is equipped with a movable counterweight which is caused by the drive to perform a circular movement about the shaft at an angular displacement of substantially 180.degree.

Abstract: A method of mounting and dismounting hammers in a hammer mill in which the hammers are supported in rows on carrier bars, in which each such row of hammers is grasped, lifted and held, by means of a gripping and lifting device, in a position in which the carrier bar, on mounting of the hammers, may, in the unloaded state, be inserted in the row of hammers and connected to the rotor of the hammer mill in order thereafter to be loaded with the weight of the hammers. Moreover, on dismounting of the hammers, the carrier bar may, in the unloaded state, be withdrawn from the row of hammers which is thereafter lifted out of the hammer mill.

Abstract: An overload preventing device in crushers of the type having a crushing chamber with a conical crushing surface and a crusher head with a conical crushing surface being eccentrically rotatable about a shaft of the crusher, is of a simple and reliable construction and continuously varies the nip formed between the crushing surfaces as a protection against the crusher being overloaded.