An apparatus including a rotor position detection unit with a sensor configured to detect an angular position of a rotor of a horizontal shaft impact crusher, the rotor having attached thereon a group of hammers. A motor control system is configured to change the rotation speed of the rotor and an automation and control system is configured to control the motor control system in response to the detected angular position of the rotor. The rotor position detection unit is configured to detect a first and second angular position of the rotor corresponding to a first and second position of a hammer of the group of hammers attached to the rotor. The motor control system comprises a frequency converter and a brake configured to enable the stopping of the rotor.

An impact crusher for mineral material includes a crusher housing, a reversible rotor arranged in an impact-grinding space of an impact mechanism for propelling mineral material against wear members in the crusher housing; and an adjustment installation setting a spacing of the impact mechanism from the rotor. An upper impact space adjoins the impact-grinding space at the top and has an entry opening for the mineral material. The upper impact space has an upper height region that neighbors the entry opening, a central height region that adjoins the upper height region, and a lower height region that is contiguous to the lower impact-grinding space, with the central height region being a region having a largest internal width and at a widest location thereof, which is above a crushing circle of the rotor, has a maximum width which is larger than a diameter of the crushing circle of the rotor.

An apron assembly comprising an apron mounted to the crusher and adapted to be moved between an operating position and an open position, a tension rod operatively attached to and disposed between the shock absorber mount and the apron, a spring seat mounted to the crusher and adapted to be moved between a raised position and a lowered position, a spring operatively disposed between the tension rod base and the spring seat, an actuator mounted to the crusher and the spring seat and adapted to be moved between a retracted position and an extended position, a shock absorber operatively attached to and disposed between the spring seat and a shock absorber mount. The shock absorber reduces the pressure applied to the actuator. A method for controlling the opening in a crusher comprising providing an apron assembly and moving the shock absorber between a retracted position and an extended position.

An apron assembly comprising an apron mounted to the crusher and adapted to be moved between an operating position and an open position, a tension rod operatively attached to and disposed between the shock absorber mount and the apron, a spring seat mounted to the crusher and adapted to be moved between a raised position and a lowered position, a spring operatively disposed between the tension rod base and the spring seat, an actuator mounted to the crusher and the spring seat and adapted to be moved between a retracted position and an extended position, a shock absorber operatively attached to and disposed between the spring seat and a shock absorber mount. The shock absorber reduces the pressure applied to the actuator. A method for controlling the opening in a crusher comprising providing an apron assembly and moving the shock absorber between a retracted position and an extended position.

Disclosed is a bladed grinder (20) for plaster waste, comprising a frame (10) comprising a support for a rotating shaft, comprising a main rotating shaft (30) comprising a plurality of vanes (40) radially attached on the main rotating shaft (30), comprising a system for rotating the main rotating shaft (30), comprising at least one inlet opening (60) for introducing waste comprising plaster, comprising at least one outlet opening for recovering large size waste, comprising, in the lower portion, openings covered with separation grids for filtering the defragmented gypsum, comprising a partially cylindrical cover which covers a continuous surface, characterised in that the cover is divided into at least two removable cover sections (50).

Disclosed is a bladed grinder (20) for plaster waste, comprising a frame (10) comprising a support for a rotating shaft, comprising a main rotating shaft (30) comprising a plurality of vanes (40) radially attached on the main rotating shaft (30), comprising a system for rotating the main rotating shaft (30), comprising at least one inlet opening (60) for introducing waste comprising plaster, comprising at least one outlet opening for recovering large size waste, comprising, in the lower portion, openings covered with separation grids for filtering the defragmented gypsum, comprising a partially cylindrical cover which covers a continuous surface, characterised in that the cover is divided into at least two removable cover sections (50).

The rock crusher has hammers mounted to a rotor and anvils mounted to its casing. First and second anvil sets define a convex surface arrangement facing the rotor and second and third anvil sets define a concave surface arrangement facing the rotor. The anvil sets are oriented to reduce compaction of rocks in the infeed portion of the crusher, and to reduce compaction of aggregate in the casing of the rock crusher. In relation to the movement of each hammer along their work sector, the two operations mentioned above are carried out before a third portion of the work sector wherein rocks are directed to rebound and impact the hammers head-on along the work circle of the hammers. The rock crusher is directly driven by the engine of a potato harvester, wherein the engine, the fan of the harvester and the rock crusher share a common inertia.

A process for separating carpet fibers from carpet backing uses a grinder of the type having a rotor with a plurality of vertically spaced cutter discs and a fan disc below the cutter discs. Sections of carpet are fed into the grinder which grinds the carpet, separating the fibers from the backing and breaking the backing into relatively small particles. The grinder is connected with a series of ginning equipment for removing the ground backing from the fibers.

A process for separating carpet fibers from carpet backing uses a grinder of the type having a rotor with a plurality of vertically spaced cutter discs and a fan disc below the cutter discs. Sections of carpet are fed into the grinder which grinds the carpet, separating the fibers from the backing and breaking the backing into relatively small particles. The grinder is connected with a series of ginning equipment for removing the ground backing from the fibers.

A material processing unit has a movable tool accommodated in a housing. The housing includes a housing part which can be moved between an open position and a closed position relative to a further housing part. A safety device prevents any opening of the housing when the tool is driven and/or prevents any driving in the open position. The safety device includes at least two actuators and a controller. A first actuator locks the housing part in the closed position. A second actuator causes, supports and/or permits a movement of the housing part. Sensors are assigned to the actuators. A controller is designed to control the drive and the actuators and to receive the actuation states detected by the sensors. A method for opening/closing a housing of a material processing unit is also provided.