A pneumatic chisel includes a housing having a double-acting pneumatic cylinder in which a piston including a chisel is movably arranged along a longitudinal axis. The cylinder has a work-side section and a return-side section. The return-side section includes a damping portion and a pressure-equalization opening. The work-side section includes an end-position damping member and a compressed air connection. A compressed air reservoir is connected to the return-side section of the cylinder. A chisel guide housing includes a sealing air chamber. The piston is constructed as one piece with the chisel.

A rock crushing device includes a housing with a plurality of walls defining a chamber that has an upper inlet and a lower outlet. At least one of the walls is movable relative to another wall to define a primary compression assembly for crushing rocks within the chamber via mechanical force. There is an auxiliary crushing assembly connected with at least one of the walls to deliver a vibratory force to at least one wall for crushing rocks within the chamber. The auxiliary crushing assembly is operable together with the primary compression assembly or independent of it.

A crusher includes a housing having an inlet and an outlet at opposite axial sides, an impeller positioned proximate the inlet of the housing, and a shaft connected to the impeller and extending axially through the housing between the inlet and the outlet. At least two spaced apart support structures hold the shaft in the housing, where a plurality of dynamic blades extending outwardly from the shaft are alternatingly positioned between a plurality of fixed blades extending radially inward from an inner wall of the housing.

Systems and methods for downsizing tires are disclosed. An automated downsizing apparatus comprises a cradle, mandrel table, cutting apparatus, and a control unit. A tire mounted on the cradle may be received by the movable and rotatable mandrel table, and positioned for engagement with the cutting apparatus. A user may customize a cutting configuration to be executed by the control unit. The control unit positions the mandrel table and cutting apparatus to remove portions from the tire, according to the cutting configuration. During operation, one or more system parameters may be monitored to determine compliance with the selected configuration, and the automated execution may be manually overridden.

A slag crusher includes a screen provided so as to intersect a falling direction of a slag and having openings; at least two spreaders disposed opposite from one another on the screen; and a spreader moving unit configured to support the spreaders and move the spreaders in a direction vertical to the opposing faces of the spreaders. Each spreader includes projections and a lower projection so as to face the other spreader. In a state in which the lower projection is closest to the other spreader, the lower projection does not come into surface contact with the opposed lower projection, and a distance between the opposing lower projections is smaller than an opening dimension of the openings of the screen across a width direction of the spreaders.

A slag crusher includes a screen provided so as to intersect a falling direction of a slag and having openings; at least two spreaders disposed opposite from one another on the screen; and a spreader moving unit configured to support the spreaders and move the spreaders in a direction vertical to the opposing faces of the spreaders. Each spreader includes projections and a lower projection so as to face the other spreader. In a state in which the lower projection is closest to the other spreader, the lower projection does not come into surface contact with the opposed lower projection, and a distance between the opposing lower projections is smaller than an opening dimension of the openings of the screen across a width direction of the spreaders.

A crusher for crushing mineral material, a method for decreasing give in a crusher and a mineral material processing plant. The crusher includes a movable and a fixed crushing element arranged to receive a force. The crusher further includes a hydraulic cylinder and a piston inside the hydraulic cylinder and a piston rod attached to the piston which extends through a first end of the hydraulic cylinder and is connected to the movable crushing element. The hydraulic cylinder has a first space around the part of the piston rod in the hydraulic cylinder and a second space limited by the first space and the piston. The crusher further includes a valve and a hydraulic fluid connection from the valve to the first space. The valve is configured to enable a flow of hydraulic fluid into the first space in response only to the piston moving in the hydraulic cylinder towards the second space due to said force.

The present invention relates to a hydraulic breaker. The valve is installed on an inner surface of the cylinder bush and the cylinder inner diameter portion to be movable in the vertical direction. The valve includes an upper valve portion having an upper end surface on which the pressure of the upper cylinder chamber acts, a lower valve portion having a lower end surface on which the pressure of the upper cylinder chamber acts, a first valve expanded-diameter portion which is formed between the upper valve portion and the lower valve portion, of which an outer diameter expands to be greater than outer diameters of the upper valve portion and the lower valve portion, and in which a first upper valve hydraulic pressure area communicates with the first and second flow channels, and a second valve expanded-diameter portion which is formed between the first valve expanded-diameter portion and the lower valve portion, of which an outer diameter expands to be greater than an outer diameter of the first valve expanded-diameter portion, and in which the second upper valve hydraulic pressure area communicates with the fourth flow channel, and the pressure of the valve switching chamber acts on a lower valve hydraulic pressure area having an area greater than an area of the first upper valve hydraulic pressure area.

A hydraulic breaker without a back head, includes a main control valve, to which fluid is supplied from the outside of the polyhedron, and accommodating a pilot valve for controlling the main control valve, in the interior space of the polyhedron, and in which impact force is obtained by double-acting cylinders, operated by the main control valve, moving modules that are connected to piston rods backwards and forwards, thus moving an integrated impact ram and ram block module forward, and filled compressed gas rapidly pulling back the integrated impact ram and ram block module.

A toggle block adjustment arrangement for a jaw crusher is provided.