The present invention regards a refiner plate segment (1) for a disc-type refiner apparatus (30), adapted to grind a saturated cellulosic material (M) in a refining gap (17) defined by opposed discs (20) during use of the apparatus (30), the material being moved from a refiner inlet opening (21) towards an outer edge (7) of the segment (1). The outer edge (7) of the segment (1) comprises a barrier arrangement (15) to increase the pressure in the refining gap (17) for retaining the liquid phase out to said outer edge (7). The present invention also regards a method of refining a saturated cellulosic material (M) in a refining gap (17) defined by two opposed discs (20) of a disc arrangement.

An arrangement and a method for adjusting a blade gap in a refiner. The arrangement comprises at least one loading device arrangeable to move at least one refining element of the refiner in respect of at least one another refining element of the refiner for adjusting the blade gap between the refining elements, at least one vibration measuring device for measuring a vibration of the refiner in operation, and at least one control unit configurable to adjust the blade gap between the refining elements by controlling the at least one loading device to move the at least one refining element in respect of the at least one another refining element based on the measured vibration of the refiner.

Provided is a disc gap servo control device and method for a powder grinding system, which includes a disc powder grinding machine, a rotating speed regulating device of a rotating disc, the disc gap servo control device and a control cabinet. The method includes the following steps of: (1) inputting a control information; (2) an industrial computer obtaining a current disc gap and displaying the disc gap on a touch screen; (3) the disc gap servo control device adjusting the disc gap; (4) the current disc gap reaches a target disc gap; and (5) a frequency converter controlling a motor rotating speed, so that the actual rotating disc rotating speed can reach a target rotating speed of the rotating disc. The operation parameters of the rotating disc are observed by the industrial computer in real time, and finally a high-precision servo control of the disc gap can be realized.

Provided is a disc gap servo control device and method for a powder grinding system, which includes a disc powder grinding machine, a rotating speed regulating device of a rotating disc, the disc gap servo control device and a control cabinet. The method includes the following steps of: (1) inputting a control information; (2) an industrial computer obtaining a current disc gap and displaying the disc gap on a touch screen; (3) the disc gap servo control device adjusting the disc gap; (4) the current disc gap reaches a target disc gap; and (5) a frequency converter controlling a motor rotating speed, so that the actual rotating disc rotating speed can reach a target rotating speed of the rotating disc. The operation parameters of the rotating disc are observed by the industrial computer in real time, and finally a high-precision servo control of the disc gap can be realized.

A powder gathering apparatus includes at least two rotating plates and a driving mechanism. The at least two rotating plates are disposed with respect to each other. Each of the rotating plates includes at least one spherical member. The at least one spherical member protrudes from the rotating plate. The driving mechanism drives at least one of the at least two rotating plates to move, such that the at least two rotating plates get close to or away from each other. The driving mechanism drives the at least two rotating plates to rotate.

A powder gathering apparatus includes at least two rotating plates and a driving mechanism. The at least two rotating plates are disposed with respect to each other. Each of the rotating plates includes at least one spherical member. The at least one spherical member protrudes from the rotating plate. The driving mechanism drives at least one of the at least two rotating plates to move, such that the at least two rotating plates get close to or away from each other. The driving mechanism drives the at least two rotating plates to rotate.

A center plate for a rotor in a pulp refiner has a surface provided with at least one feeding wing for directing lignocellulose-containing material towards a periphery. The feeding wing is an elongated protrusion arranged such that its second end is arranged further away from a center of the center plate than a first end and also is displaced relative to the first end in a direction opposite to a direction of rotation of the rotor. The center plate is also provided with at least one counter-feeding wing for directing steam flowing along the surface towards the center of the center plate. The counter-feeding wing is an elongated protrusion arranged such that a second end of the counter-feeding wing is arranged further away from the center of the center plate than a first end and closer to the center of the center plate than the first end.

A grinder for grinding beans of plant-based products and generating a ground powder can include: a grinding chamber; a wheel motor having a shaft defining an axial direction; a rotating grinding wheel and a stationary grinding wheel housed in the grinding chamber, wherein the rotating grinding wheel is connected to the shaft of the wheel motor and is configured to rotate around the axial direction, and wherein the stationary grinding wheel is stationary against rotation and is configured to axially move in both ways in the axial direction; and a device for resetting position of the rotating and stationary grinding wheels. The device can include: a mechanism for axially moving the stationary grinding wheel; an electric motor, coupled to the mechanism, for actuating the mechanism; and a way to stop the electric motor as soon as a contact state is detected between the stationary and rotating grinding wheels.

A grinder for grinding beans of plant-based products and generating a ground powder can include: a grinding chamber; a wheel motor having a shaft defining an axial direction; a rotating grinding wheel and a stationary grinding wheel housed in the grinding chamber, wherein the rotating grinding wheel is connected to the shaft of the wheel motor and is configured to rotate around the axial direction, and wherein the stationary grinding wheel is stationary against rotation and is configured to axially move in both ways in the axial direction; and a device for resetting position of the rotating and stationary grinding wheels. The device can include: a mechanism for axially moving the stationary grinding wheel; an electric motor, coupled to the mechanism, for actuating the mechanism; and a way to stop the electric motor as soon as a contact state is detected between the stationary and rotating grinding wheels.

An experimental device for SDC of powder particle sizes in a disc mill system includes a screw feeding control device, a mill speed adjustment device, a disc gap servo control device, a sampling device, a laser particle analyzer, a control cabinet and an upper computer. A control method for the experimental device includes the following steps: 1) performing initial setting; 2) starting the disc mill system; 3) performing sampling through a sampling device; 4) detecting a actual PDF (probability density function) shaping of distribution of powder particle sizes through the laser particle analyzer; and 5) updating the initial setting through a SDC algorithm. The experimental device and method can verify a series of SDC algorithms, and provides good a better experimental platform for teaching and scientific research; and the shape of non-Gaussian distribution of output random variables of a stochastic distribution system can be effectively controlled.