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The screw conveyer that is transported by the rotation can be divided into three kinds of working principle.:
(1) the gravity slide method. Low rotate speed of the spiral, materials in the spiral surface by the influence of gravity than the effect of centrifugal force, due to the spiral rotation material continuously along the spiral face down, then generate axial displacement, CX screw machine basically belongs to this kind of principle. The filling coefficient of the screw is generally less than 05. For filling, material is not along the spiral slide down, but by the spiral stirring to make it through the spiral shaft falling, and can't get a big axial velocity. Since the slow - helical material is influenced by gravity, it is obvious that it can not be used for vertical or inclined angle.
Large upward transport.
Abseil principle, although 20 small values, low transporting ability, but the material in free rolled easily scattered, less vulnerable to extrusion is easy to agglomerate, grinding chisel material.
When using the standard screw, not only can keep the speed of the slide, and the inclination of a certain degree of adaptation (inclination is generally within 20 degrees).
(2) pushing method. This method was used for the silo bottom discharge screw conveyor, material is often full of spiral, granular materials subjected to static pressure is bigger, every grain of material itself gravity far less than other forces (spiral thrust, friction, static pressure). The resistance of this kind of screw is very big, it wants to overcome the friction force which forms under the big pressure. When the material is like a nut, screw screw like role, as long as the nut does not turn (or rotating slower), using the screw rotation, you can make the nut along the axial movement, on the bottom of the bin unloading spiral often uses the variable pitch screw, in the outlet section of the distance is larger.
(3) centrifugal induction. For the vertical inclination steep spiral conveyor, or any high speed screw conveyor, the characteristics of the work is the material filling volume between two between, in a spiral of high speed, loose material by the action of centrifugal force than the gravity and other external effects.
