A jaw crusher includes a stationary crusher jaw and a movable crusher jaw between which a crushing chamber and a crushing gap are formed. The movable crusher jaw can be driven by a crusher drive to generate a crushing motion. An overload protection mechanism includes a control unit, which, in the event of an overload, causes the crusher jaws to move relative to one another in such a way that the crushing gap is enlarged. An actuator unit is driven by the kinetic energy of a driven component of the jaw crusher, in particular the flywheels or the crusher drive driving the flywheels and the movable crusher jaw. At least one actuator is acted upon by the actuator unit using a transfer medium to effect the gap adjustment.

A high-pressure pump for the overload protection of a jaw crusher, with an actuator unit which adjustably receives an actuation element in a housing, wherein the actuation element has at least one piston, wherein at least one actuator, tensioning cylinder and a pressure accumulator are provided, wherein the actuator unit is in fluid-conveying connection with the actuator such that in one pump stroke of the actuator unit a transfer fluid is pumped into a second chamber of the actuator and of the tensioning cylinder and the quantity of transfer medium displaced from the actuator, and the tensioning cylinder during the pump stroke is temporarily stored in a pressure accumulator.

The invention relates to a method for controlling the charging of a crusher, driven by a crusher drive via transmission elements, of a material comminution system, wherein material which is to be crushed is fed to the crusher, a filling level of the crusher is determined using a filling level sensor, and the volume flow of material to be crushed is set and/or regulated according to the filling level determined. 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 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 crusher bucket comprising a casing in which there are mounted crushing means comprising a fixed jaw and a movable jaw, in which the movable jaw is supported on the casing by means of a pair of eccentric shafts, wherein at least one of the eccentric shafts is directly fixed to the side walls of the casing.

Systems, methods and apparatus are provided for crushing rock. In some embodiments a toggle feature of a jaw crusher is in tension during operation. In some embodiments a lower portion of the moveable jaw moves simultaneously moves closer to the stationary jaw and forward along said first direction. In some embodiments, a direction along which material moves between the moveable and stationary jaws is closer to horizontal than vertical.

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.

The invention relates to a jaw crusher having a stationary crusher jaw (21) and having a movable crusher jaw (22), between which a crushing chamber (23) and a crushing gap (24) are formed, wherein the movable crusher jaw (22) can be driven by a crusher drive (30) to generate a crushing motion, wherein an overload protection mechanism is assigned to one of the crusher jaws (21,22), preferably to the movable crusher jaw (22), wherein the overload protection mechanism comprises a control unit (60), which, in the event of an overload, causes the crusher jaws (21,22) to move relative to one another in such a way that the crushing gap (24) is enlarged. In such a jaw crusher, an improved operation can be achieved if provision is made that an actuator unit (100) is driven by means of the kinetic energy of a driven component of the jaw crusher, in particular the flywheels or the crusher drive (30) driving the flywheels and the movable crusher jaw, and that at least one actuator (80) is acted upon by the actuator unit (100) using a transfer medium to effect the gap adjustment.

A tramp iron relief system for a crusher. The preferred system includes a tramp iron relief cylinder, a relief valve adapted to open when oil pressure within said tramp iron relief cylinder exceeds a pre-designated limit, a tramp iron relief cylinder manifold block that is adapted to control the flow of oil into and out of the tramp iron relief cylinder, a tension cylinder, a tension cylinder manifold block adapted to control the flow of oil into and out of the tension cylinder, a tank line accumulator, and a hydraulic line to convey oil between the tank line accumulator, the tramp iron relief cylinder, and the tension cylinder. A method for controlling the movement of the tramp iron relief cylinder including reducing the pressure in the rod end of the tramp iron relief cylinder during normal operations of the crusher.

The invention relates to a high-pressure pump for the overload protection of a crusher unit (20), in particular a jaw crusher, with an actuator unit (100) which adjustably receives an actuation element (110) in a housing (100.1), wherein the actuation element (110) has at least one piston (110.1, 110.2) or the actuation element (110) is connected to at least one piston (110.1, 110.2), wherein at least one actuator ((80), tensioning cylinder (40)) and a pressure accumulator (150) are provided, wherein the actuator unit (100) is in fluid-conveying connection with the actuator (80) such that in one pump stroke of the actuator unit (100), a transfer means is pumped into a second chamber (40.1, 80.2) of the actuator ((80), tensioning cylinder (40)) and the quantity of transfer medium displaced from a further first chamber (40.2, 80.1) of the actuator ((80), tensioning cylinder (40)) during the pump stroke is temporarily stored in a pressure accumulator (150). Such a high-pressure pump can be used, in the case of an overload, to effectively act on the support system of the crushing jaws (21, 22) to let the uncrushable or hard to crush object escape from the crushing jaws by allowing the crushing jaws to move away from one another.

A resettable relief system for a crusher is provided. A first linkage member is connected to a material crushing portion of the crusher is connected to a second linkage member in a hinged manner. A hydraulic device exerts forces to the linkage members sufficient to maintain them in an unrelieved position, until forces exerted on the linkage members from the material crushing portion exceed a predetermined threshold, and then permit said first and second linkage members to move into a relieved position.