A refiner for refining of lignocellulosic material includes a rotor disc and a stator disc. The rotor disc includes a first refining segment that includes a plurality of first protruding structures for grinding of the lignocellulosic material. Each of the first protruding structures is defined by a first height. The stator disc is arranged opposite the rotor disc and includes a second refining segment that includes a plurality of second protruding structures for grinding of the lignocellulosic material. Each of the second protruding structures being defined by a second height. The first height is at least three times larger than the second height.

The present invention relates to the field of grinding equipment, in particular to a powder grinder, comprising a power mechanism, a grinding mechanism, and a feeding mechanism. The feeding mechanism comprises a bowl and a base. The bowl is detachably installed on the base, and the power mechanism is detachably installed on the bowl. The first discharge opening is arranged in the middle of the bowl, and the second discharge opening is arranged in the middle of the base. An adjusting plate is rotatably installed on the base. The third discharge opening is arranged in the middle of the adjusting plate. An adjusting ring is arranged between the bowl and the base. The second connecting assembly is arranged between an inner edge of the adjusting ring and an outer edge of the adjusting plate. A bearing is arranged in the bowl. One end of the bearing is connected to the power mechanism, and the other end of the bearing passes through the first discharge opening, the third discharge opening, and the second discharge opening in sequence and is connected to the grinding mechanism for separate removal and cleaning of the bowl, the base, and the grinding mechanism. When cleaning, the power mechanism can be separately detached, which effectively prevents liquid from entering the inside of the power mechanism.

The present invention provides systems and methods for production using manual labor. The present invention involves the transition of energies to perform labor. The transition involves manual labor energy turning into kinetic energy and further transition of the kinetic energy into mechanical or electrical energy used for performing designated labor.

The proposed technology provides refiner segment pair comprising a first segment (30) and a second segment (31), said first segment (30) being configured to be used with a rotor disc for a refiner of lignocellulosic material and said second segment being configured to be used with a stator disc for said refiner of lignocellulosic material, said first and second refining segments (30; 31) comprising protruding structures (40) for grinding of said lignocellulosic material. The height of the protruding structures (40) on said first refining segment (30) is at least three times larger than the height of the protruding structures (40) on said second refiner segment (31). The proposed technology also provides a refiner comprising such a refiner segment pair and the use of a refiner segment pair (30; 31) in a refiner (1) for refining lignocellulosic material.

Some embodiments of an exemplary manual or electric grain mills may include a mill body; a mill mechanism disposed within the mill body, the mill mechanism including a mill shaft and a shaft coupling; a hand crank having a hand crank driveshaft configured to be selectively coupled to the shaft coupling to drive the mill mechanism when the hand crank is manually operated; and a motor assembly. The motor assembly may include a motor housing, a motor disposed within the motor housing, and a motor driveshaft operatively coupled to the motor, the motor driveshaft being configured to be selectively couple to the shaft coupling and drive the mill mechanism when the motor is powered.