A Shaftless Screw Conveyor with Variable Pitch

Abstract

The invention provides a variable pith shaftless spiral conveyor. The conveyor comprises a motor, a cylindrical conveying sleeve, a conical conveying sleeve, spiral blades, a feeding cabin, a blanking box and a mixing box, wherein one end of the cylindrical conveying sleeve is rotatably mounted on one side of a discharge hole of the feeding cabin while the other end of the cylindrical conveying sleeve is fixedly connected to one end of the conical conveying sleeve; the other end of the conical conveying sleeve is rotatably mounted on one side of a feed inlet of the blanking box; the first spiral blade is fixedly connected to the inner wall of the cylindrical conveying sleeve and the other end of the first spiral blade is fixedly connected to one end of the second spiral blade; and the outer side face of the second spiral blade is maintained to be tangential to the inner wall of the conical conveying sleeve and the second spiral blade can be detached. According to a split structure of a conveying barrel, under the circumstance that the second spiral blade is damaged, the whole spiral blade does not need to be replaced, so that the using cost is lowered and the spiral blade is easy to replace.

Description

technical field [0001] The invention relates to a screw conveyor, in particular to a shaftless screw conveyor with variable pitch. Background technique [0002] The screw conveyor has the advantages of simple structure, low manufacturing cost, strong sealing, safe and convenient operation, etc. At present, shaftless screw conveyors are widely used in chemical industry, building materials, metallurgy, food and other departments, but compared with shafted screw conveyors, due to the lack of intermediate shafts, all stress points are on the blades, resulting in excessive pressure, so Traditional shaftless screw conveyor blades are severely damaged and need to be replaced frequently. Due to the large force on the blades, the existing shaftless screw conveyor uses equidistant blades, the pipe diameter is small, and the conveying capacity is small, which cannot meet the conveying requirements in some occasions. For non-viscous dry powder materials and small particle materials, t...

AI Technical Summary

Problems solved by technology

However, due to the limitation of the above-mentioned structure, the screw conveying with a shaft leads to a small conveying volume, and the entire screw shaft needs to be replaced after the blades are worn, resulting in unnecessary waste

The shell cannot be disassembled, and the sticky material on the screw shaft cannot be cleaned

[0004] The utility model patent with the publication number CN202011613U discloses a screw conveyor, comprising a screw conveyor shell, a feed port and a discharge port, the feed port is arranged at the bottom end of the screw conveyor shell, and the discharge port It is arranged on the upper part of the shell of the screw conveyor, and a driving device is arranged on the top end of the shell of the screw conveyor. A feeding screw mechanism is fixedly connected to the inner shaft, and the feeding screw mechanism extends to the outside of the feeding port along the axial direction of the screw inner shaft. It is convenient, with large conveying capacity and high conveying efficiency. Its feed port can easily enter the whole pile of bulk grains to complete the conveying operation. Requires complete screw shaft replacement

[0005] and if figure 1 As shown, the conveying cylinders of the screw conveyors in the prior art are all one-piece straight cylinder structures, and their forces are as follows: figure 1 As shown, the material extrusion force on the blade is F. At this time, the F force is relatively large and directly acts on the end of the screw blade, which causes serious wear of the screw blade and greatly shortens the service life of the screw blade, so that the blade needs to be replaced frequently

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