A multistage hammer mill 10 has a plurality of milling stages arranged concentrically so that substantially all material in a first innermost of the milling stages passes through all subsequent adjacent milling stages. A central feed opening 12 enables material flow into a primary impact zone 14 of a first milling stage, which has an impact mechanism 16 and a first screen arrangement 20a. The impact mechanism 16 rotates about a rotation axis 18. The first screen arrangement 20a is disposed circumferentially about and radially spaced from the impact mechanism 16 and has a plurality of apertures 22 through which impacted material of a first size range can pass. A second milling stage has a second arrangement 20b disposed circumferentially about and radially spaced from the first screen arrangement 20a and a circular array of impact elements 50a between the first and second screen arrangements.

A multistage hammer mill (10) has a plurality of milling stages arranged concentrically about each other. The plurality of milling stages arranged so that substantially all material in a first inner most of the milling stages passes through all subsequent adjacent milling stages. The milling stages include a first milling stage and a second milling stage. A central feed opening (12) enables material flow into a primary impact zone (14) of the first milling stage. The first milling stage has an impact mechanism (16) and a first screen arrangement (20a). The impact mechanism (16) rotates about a rotation axis (18). The first screen arrangement (20a) is disposed circumferentially about and radially spaced from the impact mechanism (16) and is provided with a plurality of apertures (22) through which impacted material of a first size range can pass. The second milling stage has a second arrangement (20b) disposed circumferentially about and radially spaced from the first screen arrangement (20a) and a circular array of impact elements (50a) disposed between the first screen arrangement (20a) and the second screen arrangement (20b).

An apron return assembly having a pump that is adapted to convey a fluid, an apron actuator having an apron actuator cap side and an apron actuator rod side and being in fluid communication with the pump, an accumulator that is in fluid communication with the apron actuator cap side, a reservoir that is in fluid communication with the apron actuator, and a tension rod having a frame end and an apron end. In the preferred apron return assembly, the apron actuator and the tension rod are adapted to move the apron between a closed position and an open position. A method for moving the apron from the open position to the closed position.

An impact mill (10) has an inlet (12) for material to enter the mill, an impact mechanism (16, 50) arranged to rotate about a rotation axis and being operable to pulverise the material after entering through the inlet, and an outlet (154) for discharge of pulverised material. Blockage sensors (Bj), vibration sensors V, torque sensors Tn, temperature sensors and proximity sensors may be selectively incorporated into the mill.

A differential vertical shaft impact (VSI) crusher, including: a tank and a plurality of single-stage rotors, and a rotating shaft and a rotor block of each single-stage rotor are coaxial, where the rotating shafts of the plurality of single-stage rotors use a hollow shaft structure and are coaxially mounted in a sleeving and sheathing manner, the rotor blocks of the plurality of single-stage rotors are connected in series, the plurality of single-stage rotors form a multi-stage rotor, the multi-stage rotor is mounted inside the tank in a vertical rotation manner, rotating shafts of two single-stage rotors that are mounted in the sleeving and sheathing manner are in running fit with each other, each single-stage rotor has an independent drive apparatus and can rotate independently, an impact lining is mounted on an inner wall of the tank, and impact hammers are mounted around the rotor block of each single-stage rotor.

A processing device for processing material to be processed includes a stationary housing with a feed opening for feeding material to be processed and a rotor which is arranged in the stationary housing so as to be rotatable about a vertically extending rotor axis. A plurality of bearing pins is fastened to a base element of the rotor adjacent to the outer circumference of the base element. A processing element is mounted on each of the bearing pins, and the radially outer ends of the processing elements form a processing gap with an inner circumferential wall of the stationary housing. The free ends of the bearing pins are connected to one another via a connecting disc.

A shredder having a substantially tubular casing, which is closed upward by a cover and downward by a base. The shredder also includes a rotating shaft, which is internal and coaxial to the casing, with multiple supporting elements being keyed on the shaft, each element for supporting a number plurality of shredding elements.

The shredding elements have circular trajectories with a circumference that at least partially increases from the upper part toward the lower part of the shredder.

A crusher having a substantially tubular casing, closed in an upper region by a cover and in a lower region by a base. The crusher also includes a rotating shaft, which is internal and coaxial to the casing, with multiple supporting elements, each element for supporting a number of crushing elements, being keyed to the shaft.

The crushing elements have circular trajectories with a circumference that at least partially increases from the upper region toward the lower region of the crusher.