METHOD FOR CONSTRUCTION OF ENERGY-EFFICIENT PROFILE OF ELECTRIC MEAT GRINDER SCREW WORKING PATH (VERSIONS) AND SCREW Russian patent published in 2020 - IPC B02C18/30 B02C19/22 B02C23/02 

FIELD: machine building.

SUBSTANCE: group of inventions relates to versions of a method of constructing a screw auger working profile and a screw with a profile which can be used in meat grinders. According to the first version, the method consists in performing the screw geometry realizing the next force profile shown in Fig. 2, namely: rotation force for cutting in section φ=0–360°, close to constant with steeply falling areas at beginning and end of interval, force of rotation for advancement and preliminary treatment of material on section φ=360–720°, close to constant, force of rotation for movement, sealing in axial direction of material on section φ=720–810°, close to constant, where φ—screw rotation angle. Method according to the second version additionally consists in the fact that the rotation force for the material axial propagation in the section φ=720–810°, close to constant, in which on section φ=0–360° inclination angles of helical α coil turn are made: on section φ=0–30° smoothly varying the angle α from 85–89° to 73–78°, then on section φ=30–180°—from 73–78° up to 75–78°, on section φ=180–360°—from 75–78° up to 78–83° in relation to screw lengthwise axis. According to the third version, the method further consists in that the force of rotation for movement of the material in the axial direction of compaction in the section φ=720–810°, close to constant, in which on section φ=360–720° inclination angles of coil auger spiral turn is within range from 78–83° to 73–78° with simultaneous change of working section flow section so, that screw generatrix along inner surface of working channel is made with inclination Δ=−3 to 5° to longitudinal axis in direction from first shank to second one, i.e. towards outlet, and screw generatrix along outer surface of turns is made with slope γ=2–10° to longitudinal axis in direction from first shank to second one, i.e. towards outlet. Method according to fourth version additionally consists in the fact, that rotation force for cutting in section φ=0–360°, close to constant with steeply falling areas at beginning and end of interval, force of rotation for advancement and preliminary treatment of material on section φ=360–720°, close to constant, force of rotation for movement, sealing in axial direction of material in section φ=720–810°, close to constant, in which on section φ=720–810° inclination angles of screw coil spiral range from 73–78° to 83–87°. Screw auger, mainly for mincer, comprises first shank for connection of power drive, screw part, second shank end for connection of knives. Screw part comprises φ=810°. Working path is profiled so that on section φ=0–30° there is a gradual change in the inclination angle of the α auger spiral from 85–89° to 73–78°, then on section φ=30–180°—from 73–78° up to 75–78°, on section φ=180–360°—from 75–78° up to 78–83°, in relation to screw longitudinal axis, and on section φ=360–720° inclination angle of spiral turn of screw α is from 78–83° to 73–78° in relation to screw lengthwise axis with simultaneous change of working section flow section. At that, change of the working section flow section is made so that the screw generatrix along the inner surface of the working channel has an inclination Δ=−3 to 5° to longitudinal axis in direction from first shank to second one, i.e. in direction of product outlet, screw generatrix along outer surface of turns has slope γ=2–10° to longitudinal axis, in direction from first shank to second one, i.e. towards product outlet, and on section φ=720–810° inclination angle of helical α coil turn is in range from 73–78° to 83–87°.

EFFECT: methods of constructing a profile of a screw auger and an auger with such a profile provide a mechanism for cutting and transporting material to a grinding point with aligned torque characteristics, as well as with lower power required for mincer drive.

5 cl, 7 dwg