Patent GB-1080779-A (GB)
Title: Milling machine
IPC: B02C9/00
Filed: 1964-10-29
Abstract: 1,080,779. Milling apparatus. L. PALYI. Oct. 29, 1964 [Nov. 1, 1963], No. 44234/64. Heading B2A. Apparatus for reducing particulate material e.g. wheat, feeds, chemicals &c. comprises a housing with a feed mechanism 15, Fig. 4, and a milling mechanism 16 including a first disk 103 Fig. 9, having a material receiving opening communicating with the feed mechanism, a second disk 142 co-axial with and spaced from the first, the disks having an abrasive surface on adjacent sides, and means for rotating the disks relative to each other. The surfaces are spaced apart by a distance less than the thickness of the particles so that when the material is forced between the surfaces by the centrifugal force acting on it, it is broken into smaller particles, without substantial heating or compacting; in the case of wheat milling, the bran is stripped. Feed mechanism: the flow of wheat from a supply chamber 38 into the mixing chamber 33 Fig. 4 is regulated by a ring 25 which is rotatable with respect to a sleeve 23 so as to vary the feed opening between the edge of the ring and a cone 37 and locked by a pin 57 operated by a handle 60 entering one of the holes 58. The cone 37, which is rotated on a shaft 64 by a motor 80 and gear box 84 has ribs on its outer surface to engage the wheat grains. A magnet 89 is mounted on the gear box 84 and has arms 89a to pick up scrap metal in the wheat flow; operation of the magnet is visible via a transparent housing 30. Air flow into the feed device takes place through openings 90 in the housing, which are adjustable by rotation by a handle 97 of a control ring 91 including complementary openings 96. An annular shield 98 protects the ring 91 and prevents the opening being clogged, and is graduated to permit accurate setting of the amount of air flow. Milling mechanism: The disks 103, 142, Fig. 9, are secured to upper and lower disk assemblies 100, 101. The upper disk 103 is secured on the upper surface of the four blades of an impeller 106, which is rotatable at high speed by an inner drive shaft 110, to draw the wheat/air mixture through the inlet chamber 35. The cone-shaped centre portion of the impeller changes the air and wheat flow direction; so that the wheat flows on to an attrition ring 115 which is provided with a surface 120 and is secured in undercut surfaces 116 of the upper disk 103. Inner and outer sheet metal baffles 125, 132 having U-shaped cut outs secured adjacent the outer periphery of the disc 103. The lower disc assembly 101 is rotated by an outer shaft 140 and the top surface of the lower disc carries an attrition ring. An annular baffle 152 is secured to the outer wall of the disc 142 is provided with cut-outs and perforated openings and has a long-wearing abrasive surface. A stationary baffle 175 is rigidly secured on the upper wall of the housing and has cut-outs and perforations 178. A sweeper bar 180 screwed to the lower disk 142 just clears the bottom wall 172 of the housing, so as to sweep particles into the discharge duct 183. Drive and disk adjusting mechanism: The disk assemblies 100, 101 are driven by variablespeed motors 191, 192 via shafts 110, 140. Disk assembly 101 is vertically movable to adjust the distance between the disk assemblies. By rotating the upper housing 220 for the drive shafts, the lower disk 142 can be moved up or down relative to the upper disk assembly 100. Rotation is effected by a handwheel 230, and the position of the lower disk assembly is indicated on a graduated dial 237 by a pointer 238. In operation, the baffles cause additional rubbing and separation of particles of wheat, further assistance being given by eddy-currents generated by the cut-outs 129, 140, 163, 177. A separation mechanism may perform a prebreaking operation, and a number of mills may be used in series. One of the disks may be locked, in such a case, to achieve the desired separation of wheat kernels.