A method is provided for dynamically monitoring material quality in a comminution system comprising a material crushing stage and a discharge stage. An imaging device captures images of comminuted material in the discharge stage, and characteristic features are extracted from the captured image for analysis with respect to at least one boundary condition. Output signals are accordingly generated corresponding to a determined comminution state of the comminuted material in the discharge stage. In one example, a crushing gap in the crushing stage is adjusted if the comminution state indicates material (or an amount of material) above a threshold size in the discharge stage. In another example, pre-screen settings in a pre-screen stage of the comminution system are adjusted if the comminution state indicates material (or an amount of material) below a threshold size in the discharge stage. Other comminution states and responses may, e.g., correspond to non-compliant material shapes, etc.

A crusher unit includes a mainframe that supports a crusher suitable for crushing bulk material. The unit has a primary motor carried by the frame to drive a crusher via a first drive belt extending around a first drive pulley and a first flywheel mounted at the crusher. The unit further includes a secondary motor carried by the frame to provide a secondary drive to the crusher via a second drive belt extending around a first or a second flywheel mounted at the crusher and a second drive pulley.

The invention relates to a method for controlling the charging of a crusher (50), driven by a crusher drive via transmission elements, of a material comminution system (10), wherein material (73) which is to be crushed, in particular stone material which is to be crushed, is fed to the crusher, a filling level of the crusher, preferably at a crusher inlet, is determined using a filling level sensor (61), and the volume flow of material to be crushed which is fed to the crusher is set and/or regulated according to the filling level determined. According to the invention, the mechanical loading of the crusher or a characteristic variable which is dependent on the mechanical loading of the crusher is determined directly or indirectly, and the filling level of the crusher is set according to the mechanical loading determined, or the characteristic variable which is dependent thereon. The invention also relates to a control unit and to a computer program product for carrying out the method. The method permits low-wear operation of the material comminution system and of the crusher with, at the same time, a high material throughput rate.

A method for compressing or decompressing a spring loading a tie rod in a jaw crusher. The tie rod is supported by, at one location, a pendulum of the jaw crusher and, at another location, the jaw crusher's frame through the said spring. The spring is installed between the jaw crusher's frame and a second spring support supported by the tie rod; and the second spring support is moved in relation to the tie rod. A support part of the tightening device and at least two moving screws supported by the support part are arranged to influence the second spring support. The support part is supported by the tie rod through a locking member; and the at least two moving screws supported by the support part are moved to change the distance between the second spring support and the support part.

An adjustable toggle assembly adapted for use on an item of crushing equipment having a frame and a jaw, said adjustable toggle assembly. The assembly includes a wedge having a generally tapered configuration, a first wear bar configured to contact the wedge, and a second wear bar configured to contact the wedge. The assembly also has a first cover plate and a second cover plate. The assembly further includes a means for moving the wedge relative to the first wear bar and the second wear bar. The assembly still further includes a first toggle seat that is connected to the frame and a second toggle seat that is connected to the jaw. The means for moving the wedge relative to the first wear bar and the second wear bar is adapted to move the wedge between a contracted position and an expanded position.

A jaw crusher retraction assembly having a base, a first and second mount boss, a resiliently biased component and an actuating cylinder. The cylinder and resiliently biased component are mounted axially between respective regions of the base and the first and second bosses so as to minimize stress in the retraction assembly components and to provide a compact overall design.

The invention relates to a crusher for mineral materials or recycled materials, in particular rotary impact crushers or jaw crushers, having a crusher unit (10), which has a movable first crusher body (11), in particular a rotor or a crusher jaw, wherein a second crusher body (14), in particular an impact rocker or a crusher jaw, is assigned to the first crusher body (11), wherein a crushing gap (15) is formed between the crusher bodies (11, 14), wherein a movable assembly of an overload triggering device (30) is coupled to the first or to the second crusher body (11, 14), wherein the movable assembly has a cylinder (25) of a hydraulic cylinder (20) or a piston (23) guided in the cylinder (20), wherein the movable assembly is designed to permit a motion of the coupled crusher body (11, 14) increasing the width of the crushing gap (15) in an evasive motion, wherein a pressure chamber (24) is formed in the hydraulic cylinder (20), which pressure chamber is delimited by a piston (23), and wherein the overload triggering device (30) has a valve (23.8), which, in its open position, establishes a fluid-conveying connection between the pressure chamber (24) and a compensation area (28) and, in the closed valve position, blocks this connection. In order to achieve an efficient protection of the crusher unit 10 against overload situations in such a crusher, provision is made for the valve (28.8) to be formed between two components of the movable assembly that are movable relative to each other.

A crusher may include a crushing member that is driven in an operatively connected manner by way of an eccentric element such that material to be crushed can be comminuted by way of a crushing movement generated at least in part by the eccentric element. At least one eccentric bushing may be connected by way of an active surface to the eccentric element by way of frictional engagement. The eccentric bushing may have a pressure medium chamber that uses pressure to vary the frictional engagement between the eccentric element and the eccentric bushing. In some examples, the crusher may be of a jaw type or a cone type.

A jaw crusher having a movable jaw support frame configured to facilitate interchange between shim and wedge settings. The support frame is configured specifically to minimize stress concentrations and to provide the time efficient interchange between wedge and shim settings without a need to weld, cut and machine regions of the support frame.

A jaw crusher retraction assembly having a base, a first and second mount boss, a resiliently biased component and an actuating cylinder. The cylinder and resiliently biased component are mounted axially between respective regions of the base and the first and second bosses so as to minimize stress in the retraction assembly components and to provide a compact overall design.