Multi-rotor frequency conversion sand mixer and sand mixing method

Abstract

The invention provides a multi-rotor frequency-changing sand mixer and a sand mixing method. Due to the application of a multi-rotor cutter, the overlapping degree of stirring tracks of a material is improved; meanwhile, due to the application of a frequency-changing rotor speed adjusting technology, the mixing process meet change of physical characteristic of mixed sand, that is, the mixing process can be more conductive to uniform coating of an auxiliary material (bentonite) on sand particles in the presence of water, so that the influence of small particles formed by the bentonite due to incomplete mixing on the mixing quality of casting sand can be avoided. A frequency changer is capable of automatically adjusting the frequency of a motor in a range of 50HZ-30HZ under the control of a rotation speed-time program which is determined by an industrial personal computer in advance. The multi-rotor frequency-changing sand mixer and the sand mixing method provided by the invention have the characteristics of uniformity in mixing the sand, high efficiency of mixing the sand and low energy consumption.

Description

technical field [0001] The invention relates to a sand casting equipment, in particular to a multi-rotor frequency conversion sand mixer and a sand mixing method. Background technique [0002] The multi-rotor frequency conversion clay sand mixer is a kind of sand casting equipment. The function of the rotor clay sand mixer is to stir the new and old sand, water, and auxiliary materials (bentonite) entering the barrel of the sand mixer, so that the surface of the sand particles is evenly coated with a wet bentonite film (also called molding sand). Within a certain mixing time, the sand mixer mixes the molding sand that meets the process requirements; at the same time, the mixed molding sand is loose and does not agglomerate, so as to meet the needs of casting molding. [0003] The traditionally used shock molding machine requires the wet pressure strength of the sand provided by the sand mixer to be in the range of 0.08-0.12MPa, while modern foundries have gradually used hig...

AI Technical Summary

Problems solved by technology

The disadvantages of this structure are: (1) Since the installation position of the rotor cutter is higher than the chassis, it cannot fully contact with the material, and the rotor cutter cannot fully play its role, which affects the sand mixing effect; (2) Because the S-type mixing cutter set provides The material layer of the rotor cutter is unstable, and the mixed molding sand is likely to cause poor uniformity; (3) The sand mixing time required for mixing high-strength molding sand (wet compressive strength above 0.16MPa) needs to be prolonged, and the productivity is low

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