Abstract
The paper shows that it is possible to increase the efficiency of a vertical screw mixer of bulk materials and reduce costs by determining the required size of the feeding hole in the lower part of the casing, as well as by installing a screw flange with a reverse winding in relation to the screw spiral inside the screw casing and by installing a replaceable tip with a variable lead angle at the lower end of the screw. The analysis of the process of screw loading in the hopper allowed us to obtain an analytical dependence to determine the required size of the feeding hole, in which mixed materials freely enter the screw spiral. It is proved that the placement of the screw flange on the inner surface of the casing increases the driving force of material by 1.05 – 1.80 times depending on the screw speed, which significantly reduces specific energy consumption for preparation of mixture of the desired quality. The paper provides the formula for calculating the angle of installation of the flange with respect to the screw spiral, in which the maximum effect of the flange on the mixed materials is obtained. In order to ensure the effective capture of mixed materials in the loading zone of the screw, it is proposed to perform the first spiral turn from the lower end of the screw with a variable lead angle and place it on a replaceable tip. A technical solution to the placement of spirals on the double-threaded screw is also proposed.
Highlights
For effective implementation of bulk materials mixing process, it is necessary to have equipment that fully meets the resource saving requirements while ensuring the required quality of products
On the basis of this conclusion, it is proposed to perform the first turn from the lower end of the screw with a variable lead angle from zero at the beginning of the turn to the lead angle value at the rest of the screw at the end of the turn (Fig. 4), and to avoid difficulties in the manufacture of screws, it is proposed to produce this turn in the form of a replaceable tip with the possibility of its docking with the base screw
The performed studies have allowed us on the basis of studying the process of material movement by a vertical screw to establish that to intensify the process of components mixing inside the hopper, it is necessary to increase the speed of the material relative to the screw, which can be achieved by installing a screw flange on the inner surface of the casing
Summary
For effective implementation of bulk materials mixing process, it is necessary to have equipment that fully meets the resource saving requirements while ensuring the required quality of products. The screw drive 2 is turned on (not shown in the diagram) and the blade 4 feeds materials to the screw, which captures the mixture and moves it along the inner cavity of the casing to the upper end, where it falls on the diffuser 6 and from there falls down the entire cross-sectional area of the hopper, where it is again captured by the screw, moves up and falls down again, thereby circulating the mixed materials.
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