A roller mill (1) including a housing (2) having a milling-material inlet (3), at least one milling-material outlet (4), and at least two cambered rollers (5, 5′) which are each arranged in the housing (2) so as to be rotatable about a roller axis (6). At least one roller (5) is assigned a scraper (7). The scraper (7) has a blade (8) for scraping milling material from a roller surface (9) with a scraper edge (10) which extends over an entire length (L) of the blade (8), and comprises a holder (11) with a receiving region (12). The holder is arranged in the housing (2) so as to be tiltable about an axis (13) parallel to the roller axis. An elastic bearing (14) is arranged between the blade (8) and the receiving region (12).

A scraper device for a roller crusher, which scraper device includes a rotatable multi head scraper unit having at least two scrapers arranged tangentially about the rotatable multi head scraper unit at a respective radial distance from a rotational axis of the rotatable multi head scraper unit. The scraper device further includes a rotation actuator arranged to selectively rotate the rotatable multi head scraper unit to allow operative use of one of the at least two scrapers at a time. The scraper device further includes at least one brake arrangement configured to prevent and/or restrict rotation of the rotatable multi head scraper unit during operation of the one of the at least two scrapers. A roller crusher including the scraper device and a method for operating the roller crusher is also provided.

A scraper device for a roller crusher, which scraper device includes a rotatable multi head scraper unit having at least two scrapers arranged tangentially about the rotatable multi head scraper unit at a respective radial distance from a rotational axis of the rotatable multi head scraper unit. The scraper device further includes a rotation actuator arranged to selectively rotate the rotatable multi head scraper unit to allow operative use of one of the at least two scrapers at a time. The scraper device further includes at least one brake arrangement configured to prevent and/or restrict rotation of the rotatable multi head scraper unit during operation of the one of the at least two scrapers. A roller crusher including the scraper device and a method for operating the roller crusher is also provided.

A scalper apparatus configured to divide a flow of material between filtered and unfiltered streams. The scalper apparatus may include a housing with an upper opening, a primary lower opening for outputting the filtered stream, and a secondary lower opening for outputting the unfiltered stream. The scalper apparatus may include a grate extending across the interior of the housing such that any material leaving the interior through the primary lower opening must pass through the grate while any material unable to pass through the grate is caused to move through the secondary lower opening. The scalper assembly may include a brush assembly with at least one brush movable across the grate, and a carrier assembly configured to carry the at least one brush across substantially an entire top of the grate.

The invention relates to a process for producing superabsorbent polymer particles, comprising polymerization of a monomer solution, drying the resulting polymer gel and grinding the dried polymer gel with a roll mill, wherein the rolls of the roll mill are cleaned by reducing the feed rate to the roll mill, and if the deflection and/or the power consumption increases above a setpoint, operating the roll mill with reduced feed, and increasing the feed rate to the roll mill.

The invention relates to a process for producing superabsorbent polymer particles, comprising polymerization of a monomer solution, drying the resulting polymer gel and grinding the dried polymer gel with a roll mill, wherein the rolls of the roll mill are cleaned by reducing the feed rate to the roll mill, and if the deflection and/or the power consumption increases above a setpoint, operating the roll mill with reduced feed, and increasing the feed rate to the roll mill.

A roller press machine capable of applying an electric field includes a base, a frame, press rollers, a distance adjusting device, a speed adjusting device, a voltage applying device, a feeding baffle, and a discharging device. The press roller has a roller surface made of conductive material, and an electric field is created when a charge is applied to the press roller. In the roller press, an alternating or direct current electric field is applied between the press rollers to create an electrochemical action, such that particles or a solution in a system is induced to undergo a physical or chemical change, thereby enhancing interaction therebetween, and accordingly increasing grinding and dispersion efficiency of a solid-liquid dispersion system.

An environment-friendly construction waste treatment equipment for civil engineering is provided, including a main frame, a wringing frame, first fixing columns, a second fixing column, an electric motor, etc. wherein the first fixing column is provided on each of front and rear sides of a left side of an upper portion of the main frame, the wringing frame is provided between the first fixing columns, the second fixing column is provided on rear and left sides of the upper portion of the main frame, and the electric motor is provided on the second fixing column. The electric motor is turned on, the wringing wheels wring the construction waste, the wringed construction waste falls onto the conveying belt, and then is transferred to the filtering plate via the conveying belt. In this way, as the construction waste is conveyed via the conveying belt, the equipment is prevented from being blocked.

An environment-friendly construction waste treatment equipment for civil engineering is provided, including a main frame, a wringing frame, first fixing columns, a second fixing column, an electric motor, etc. wherein the first fixing column is provided on each of front and rear sides of a left side of an upper portion of the main frame, the wringing frame is provided between the first fixing columns, the second fixing column is provided on rear and left sides of the upper portion of the main frame, and the electric motor is provided on the second fixing column. The electric motor is turned on, the wringing wheels wring the construction waste, the wringed construction waste falls onto the conveying belt, and then is transferred to the filtering plate via the conveying belt. In this way, as the construction waste is conveyed via the conveying belt, the equipment is prevented from being blocked.

A roller mill for comminuting material may include first and second grinding rollers disposed opposite one another and drivable in opposite directions and a milling gap between the grinding rollers. An end region of at least the first grinding roller comprises a peripheral element that extends across the milling gap and at least partially covers an end side of the second grinding roller. A scraping element for at least partially removing material is disposed on the end region of the first grinding roller. A measuring device can determine a layer thickness of ground material on at least one of the grinding rollers and/or determine stress in the peripheral element. A control device connected to the measuring device is configured, based on the determined layer thickness and/or stress, to decrease or increase an amount of space between the scraping element and one of the grinding rollers.