Особливості конструкцій і технологічного проєктування робочих органів лопатевих гвинтових змішувачів

Abstract

Blade screw mixers are typical tools for mixing building materials, compound feed, various types of products in the food industry, etc. The principle of their operation uses a combination of the operation of moving multicomponent mixtures with the operation of mixing them. Features of bladed screw working bodies of mixers are the arrangement of blades along a helical line along the axis of the shaft, on which they are, as a rule, immovably fixed. However, separate structures of working bodies can be located on the shaft with the possibility of rotation. The production of the working body of the blade screw mixer in the most technological ways may involve the following sequence of technological operations: 1. Winding a spiral of the appropriate diameter. Drilling holes with a drill head on the end surface of a spiral wound with a dense package on the edge of the spiral, which is installed in the conductor (provided that a mechanical connection will be used in the design of the auger). Calibrating the helix to a given pitch. Installation (screwing) of a spiral on a hollow shaft with a given pitch. Fixation of the spiral on the hollow shaft (welded connection). Production of blade elements of the appropriate profile (stamping, cutting). Drilling of mounting holes on the end surface of the blade elements (provided that a mechanical connection will be used in the design of the auger). Fastening the blade elements on the spiral: option 1: in the holes with a bolt or rivet connection; option 2: using a welded connection. 2. Winding a spiral of the appropriate diameter from a rectangular profile blank. Cutting (cutting) segmental openings (removals) of the appropriate size and profile on the end surface of a dense package wound on the edge of a spiral to form the necessary blade elements on it. Calibrating the helix to a given pitch. Installation (screwing) of a spiral on a hollow shaft with a given pitch. Fixation of the spiral on the hollow shaft (welded connection). 3. The production of an L-shaped bladed spiral involves the cutting (cutting) of segmental holes (removals) of the appropriate size and profile on the end surface of the L-shaped profile workpiece to form the necessary blade elements on it (the operation can also be used for a rectangular workpiece). Winding the L-shaped spiral on the frame with an internal continuous cylindrical part of the corresponding diameter. Calibration of the L-shaped spiral to a given pitch. Drilling of fastening holes at the ends on the end surface of the cylindrical part of the L-shaped spiral. The manufacturing technology of bladed screw working bodies of mixers significantly affects their technical and economic indicators and is ensured by the use of various methods. Technological features of the design parameters of the blade spirals of the mixers, which are made in various ways from rolled sheet, tape or L-shaped profile (angle). The results of calculating the production cost of manufacturing 1 m/p of a bladed spiral using different manufacturing methods showed that the most economically effective method of manufacturing bladed spirals is winding a dense package of spirals along the inner end profile from rectangular blanks followed by cutting (cutting out) segmental holes (removals ) and calibration to a given step, as in general and other methods that use winding. The production of blade spirals by methods using stamping or rolling is many times more expensive.