Molding sand treatment process

Abstract

The invention discloses a molding sand treatment process, and relates to a mould sand treatment process. The mould sand treatment process comprises the following process steps: (1) pre-mixing returned sand obtained from clearing a shakeout machine, scattered sand generated in a working process of a molding machine and fresh sand to obtain a mixture, and respectively feeding the mixture into a plurality of transfer storages; (2) placing the pre-mixed returned sand, the scattered sand and the fresh sand in each transfer storage into a sand mixer, mixing, adding bentonite into the sand mixer, performing dry-mixing, and adding water, and performing wet-mixing after dry-mixing; and (3) feeding the molded sand mixed in the sand mixer into the molding machine. According to the molding sand treatment process, the sand mixture, in each transfer storage, consisting of the returned sand obtained from clearing the shakeout machine, the scattered sand generated in the working process of the molding machine and the fresh sand, is input in different time periods and various parameters of the sand mixture in each stage are different; the sand mixture in different time periods of the plurality of the transfer storages is simultaneously conveyed to the sand mixer, so that the sand mixture at each time period is mixed for second time, and the various parameters of the molding sand tend to be uniform.

Description

technical field [0001] The invention relates to molding sand treatment technology. Background technique [0002] The process flow of medium-sized sand treatment in the prior art: Usually, the sand treatment system mainly includes the joint recovery of old sand or modeling scattered sand, magnetic separation, screening and crushing, and after storage, new sand, old sand, bentonite and water are mixed in the sand mixer. rolling. [0003] If the performance of molding sand such as wet compaction strength, compaction rate and water content is stable, special equipment for premixing, such as double-disk coolers, can be added before mixing rolling. All new sand, old sand, bentonite and large Part of the water, make up all the amount of water added during the second mixing. [0004] The existing molding sand treatment process has many defects: 1. The temperature of the mixed molding sand is high; 2. The uniformity of mixing between new sand, old sand, and bentonite is poor; 3. Th...

AI Technical Summary

Problems solved by technology

[0004] The existing molding sand treatment process has many defects: 1. The temperature of the mixed molding sand is high; 2. The uniformity of mixing between new sand, old sand, and bentonite is poor; 3. The performance of the molding sand is unstable, which can easily lead to production failure. Casting scrap rate is relatively high

4. Increasing premixing requires more investment in equipment

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