Abstract: A sand making apparatus comprises: a crusher configured to crush crushed materials; a first sorter configured to sort the crushed materials obtained from the crusher into coarse particles, fine particles, and powders through air sorting by air blowing and screening sorting by a screen; a negative pressure collection unit configured to suck and collect the powders from the first sorter; and a second sorter disposed between the first sorter and the negative pressure collection unit, the second sorter configured to sort the powders into coarse powders and fine powders through negative pressure of the negative pressure collection unit.

Abstract: A sand making apparatus comprises: a crusher configured to crush crushed materials; a first sorter configured to sort the crushed materials obtained from the crusher into coarse particles, fine particles, and powders through air sorting by air blowing and screening sorting by a screen; a negative pressure collection unit configured to suck and collect the powders from the first sorter; and a second sorter disposed between the first sorter and the negative pressure collection unit, the second sorter configured to sort the powders into coarse powders and fine powders through negative pressure of the negative pressure collection unit.

Abstract: A decanter type centrifugal separator capable of discharging sludge directly from a portion of the sludge with least moisture content in a bowl so as to lower a moisture content and increase a separation efficiency, wherein a screw conveyor rotated with a difference in speed provided relative to the bowl is stored in the bowl rotated at a high speed, a dewatering cake discharge route (20) is provided in one end wall (2) of the bowl, an opening (20a) of the route into the bowl is provided near the inner peripheral wall of the bowl, the discharge route provides a restriction effect to the discharge of the dewatering cake, and a sedimentary layer with thick sedimentation layer is formed near the opening, whereby that portion only of the cake is discharged through the discharge route under head press of the sedimentation layer, that portion receiving the highest consolidation effect by the head press of a centrifugal force acting on the sediment, among the sedimentation layers accumulated at one end of the bowl.

Abstract: The objective of this invention is to provide a sliding mechanism for the toggle block of a jaw crusher that enables the position of the toggle block to be adjusted easily and quickly. This invention is a novel sliding mechanism for the toggle block of a jaw crusher, in which the toggle block supports one end of a toggle plate connected at the other end to the bottom end of the swing jaw: The toggle block is comprised of an upper block and lower block, joined by an elastic body, sandwiched between an upper support member and lower support member that are joined to the machine frame. The toggle block slides back and forth with the application of an external force.

Abstract: The objective of this invention is to provide a method to adjust the position of a jaw crusher toggle block, and a device used for said method; wherein the said device can adjust the cavity width over a wide range, and can be applied to a wide range of jaw crushers, including large models, without itself having to be enlarged.

Abstract: This invention relates to a chip plate provided at the outlet on the circumference of the rotor of a centrifugal crusher. The cemented carbide chip embedded in the chip plate is the either rounded or sloped in the internal part of its tip and, even if the cemented carbide chip is exposed as a result of wear and a mass of rock hits against it, the impact of collision is softened because the said mass of rock rushes out by slipping on it, thus preventing breaking of the cemented carbide chip.

Abstract: In an apparatus and method for producing sand from stone, the stone is first crushed in a centrifugal crusher and then filtered through a screen. The stone retained on the screen is further crushed by a vibration mill. The stone passing through the screen and the stone crushed by the vibration mill are combined and then are filtered through a separater to separate out the minute particules. Measurements of various flow rates and particle sizes are made in order to control the rotational speed of the vibration mill and the rate at which stone is supplied to the screen.

Abstract: An improved screw decanter type centrifugal concentrating machine for the type including a bowl and a screw conveyor rotatably supported within the bowl in the coaxial relation is disclosed. The screw conveyor is rotated at a different rotational speed from that of the bowl and an arrangement is made such that liquid initially supplied prior to separating, concentrated liquid and residual liquid after completion of separation are continuously supplied and discharged through the hollow space in the hollow shafts of the bowl and the screw conveyor. To properly adjust discharge rate of concentrated liquid and residual liquid from the machine or concentration of solid material in both liquids, throttle valves are disposed at the position located midway of discharge passages extending from the hollow shafts. The throttle valves are preferably designed in the form of an automatically controlled valve. Suspension to be treated is introduced into the bowl by way of guide vanes on the side wall of the bowl.