Wet mold clay sand treatment system and sand treatment method for large steel castings

Abstract

The invention discloses a large-size cast steel wet type clay sand treatment system and sand treatment method. The system comprises equipment such as belt conveying devices, magnetic separators, a hexagonal fine screening device, a double-disc cooler, a sand regenerator and a sand mixer, and the method comprises the steps of used sand recovery, used sand treatment, used sand regeneration, modeling sand mixed manufacturing, relevant testing, modeling sand quality control, system dedusting and the like. By means of the large-size cast steel wet type clay sand treatment system and sand treatment method, used sand is recycled and regenerated, production quality of modeling sand is improved, and the production cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of sand casting sand treatment, in particular to a green clay sand treatment system and sand treatment method for large steel castings. Background technique [0002] my country is a big manufacturing country. Casting is the basic manufacturing method of mechanical products. The output of various castings is on the rise, of which sand casting accounts for a large proportion. Sand casting sand is mainly sodium silicate sand, resin sand, green clay sand, coated Membrane sand, etc. Common sand treatment systems (such as sodium silicate sand treatment systems, resin sand treatment systems, etc.) have harsh working environments and poor equipment operating conditions. During the operation of sand treatment systems, the following problems generally exist: [0003] 1. It is difficult to recycle old sand: the pouring temperature of steel castings is about 1760°C. After the water glass sand is poured in the casting, th...

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Problems solved by technology

[0003] 1. It is difficult to recycle old sand: the pouring temperature of steel castings is about 1760°C. After the water glass sand is poured in the casting, the water glass will form a water glass sintered layer under the action of high temperature, which is difficult to recycle; resin sand is under the action of high temperature. , the resin is emitted in a gaseous state after sintering, so the water glass sand treatment system and resin sand treatment system generally do not have the ability to regenerate sand

Therefore, the consumption of water glass sand and resin sand is very large, the production cost of product is high, and environmental pollution is big

[0004] 2. Sand temperature control is difficult: the old sand mainly comes from the shakeout of the casting mold and the scattered sand on the production site. The temperature of the old sand after the shakeout of the casting mold is very high (especially in summer), which is not suitable for direct use. , under normal circumstances, it takes a long time for the old sand to cool or a dedicated site for cooling, which affects the production organization and the quality of the molding sand

[0005] 3. The quality of molding sand fluctuates greatly: recycled sand contains a lot of dust, fine waste sand, metal debris, etc. Common sand treatment systems cannot control the mud content of recycled sand, which affects the quality of molding sand and product quality

During the molding sand mixing process, the relevant parameters of the molding sand cannot be detected and monitored in a timely manner, and the problem can only be found after the molding or the casting is produced, which increases product quality risks and production costs

[0006] 4. The function is simple: the process flow of the common sand treatment system (see figure 1 ) is a simple combination of raw sand procurement, used sand transportation, molding sand mixing, and molding sand transportation functions, which cannot meet the requirements of modern foundry production for sand processing efficiency, quality, flexibility, intensiveness, safety and environmental protection

[0007] 5. Poor working environment: A large amount of dust will be generated during the production process of sand casting and sand out of the box. Waste discharge is very polluting to the environment, and it is difficult to meet the requirements of environmental protection and occupational health

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