Abstract: The object of the invention is an apparatus and a method for grinding lumpy material. The solution according to the invention comprises a grinding plate (2) rotating on the horizontal plane around a vertical axis of rotation, onto the top surface of which the material (3) to be ground can be fed, and on the top surface (8) of which grinding plate is a plurality of grinding discs (4a), which rotate by the effect of the rotating motion of the grinding plate (2) and compress the material to be ground against the grinding plate (2). The apparatus comprises a revolver mechanism for changing the angle of the plane of rotation (RP) of the grinding discs (4a) with respect to a line in the direction of the radius of the grinding plate (2).

Abstract: A projectile including a jacket, a core and a stabilizer part, the stabilizer part including a shaft and a fin part fastened to the shaft at the first end of the stabilizer part, whereby in the core of the projectile is a cylindrical cavity, which is closed at least partly with a shutoff part in which shutoff part is an aperture for the shaft of the stabilizer part, whereby a piston is fastened to the second end of the shaft of the stabilizer part, which piston is disposed in a cavity for forming a space at the front end of the piston and through the shaft of the stabilizer part a channel passes into the space and in the front part of the cavity is a solid fuel, which is made to ignite by means of the powder pressure produced in conjunction with firing of the projectile.

Abstract: A hydraulic press and a method of pressing different kinds of objects, such as briquettes. The hydraulic press includes a body cylinder (1) housing a fluid space (2) and a working piston (3) whose rod (3a) extends to the outside of the body cylinder (1), the working piston (3) being adapted to be moved in the fluid space (2) by hydraulic pressure. The hydraulic press also comprises a pressure accumulator (4) as well as a hydraulic circuit with valves. Inside the working piston (7) moved by hydraulic pressure, a striking piston (7) moving along with the working piston (3) and quickly movable relative to the working piston (3) by hydraulic pressure, is provided. In addition, a separate impact body (10) is provided between the striking piston (7) and the object (14) pressed by the hydraulic press.

Abstract: The object of the is A fine grinding apparatus and a method for grinding granular material includes a grinding plate rotating on the horizontal plane around a vertical rotation axis, onto the top surface of which grinding plate the material to be ground can be fed, and on the top surface (of which grinding plate is a plurality of grinding discs, which rotate from the effect of the rotating motion of the grinding plate and compress the material to be ground against the grinding plate. The apparatus has one or more refiner elements pressing against the top surface of the grinding plate and rotatable around their vertical center axes, by means of which elements the material to be ground is kneaded on the top surface of the grinding plate.

Abstract: An apparatus for crushing material includes an upper rotor and a lower rotor, the rotors rotating in a horizontal plane in opposite directions around a vertical axis of rotation, whereby in the center of the upper rotor there is an opening for feeding material between the upper rotor and the lower rotor, and pins on the outer rim of the upper rotor, whereby the lower rotor comprises pins and a central cone with blades, and that the pins of the lower rotor are mechanically fastened in a detachable manner to the lower rotor for individually replacing the pins and that the pins are installed in series in the radial direction of the lower rotor and all the pins of the lower rotor are closer to the axis of rotation of the rotors than the pins of the upper rotor.