Preheating device for melting nonferrous metals

Abstract

The invention provides a preheating device for melting nonferrous metals. The preheating device comprises a support mechanism on which at least one roller and a driving mechanism for driving the roller to rotate are arranged, the two ends of the roller are closed, and a preheating cavity is formed in the roller; one end of the roller is provided with a feeding hole, and the other end of the roller is provided with a discharge hole; the roller is further provided with a waste heat air inlet communicated with the preheating cavity, the inner wall of the roller is obliquely provided with a plurality of scraping plates, and a to-be-heated material block moves to a discharge hole under the function of the scraping plate when the roller is driven to rotate by the driving device. According to the preheating device provided by the invention, a material piece can be preheated by the preheating device, therefore the temperature difference between the material piece and a melting furnace can be reduced, and the explosion can be prevented after the cooled material piece enters the melting furnace; meanwhile, the melting efficiency can be improved, and the burning and heating time of the melting furnace can be reduced.

Description

Technical field [0001] The invention relates to the technical field of non-ferrous metal smelting, in particular to a preheating device for non-ferrous metal smelting. Background technique [0002] Casting is a process in which molten metal is poured into a mold and cooled and solidified to obtain parts with the required shape and performance. Casting is a commonly used manufacturing method with low manufacturing cost and great process flexibility. It can obtain complex shapes and large castings. It occupies a large proportion in mechanical manufacturing. The cast metals include: copper, iron, aluminum, tin, lead, etc. . [0003] Before the cast metal is formed into a casting, it must be smelted into a molten metal or called a melt. The current production process of obtaining a molten metal in the foundry industry in China is as follows: 1. Prepare raw materials, including pure metals, recycled metals and other Metals, etc.; 2. The smelting plant remelts the raw materials into mo...

AI Technical Summary

Problems solved by technology

This traditional smelting process not only has a complicated process and a long production cycle, but also requires the construction of a large number of workshops and equipment in the two steps of remelting into melt in the smelting factory and remelting the metal ingot into melt in the foundry enterprise, which not only increases production input, but also consume a lot of energy, resulting in waste of energy

In short, due to the backwardness of production equipment and facilities, the traditional smelting process is not energy-saving and environmentally friendly; while the secondary melting of the traditional production mode produces secondary burning loss and energy consumption, which intensifies energy consumption, emissions and pollution

[0004] In the traditional smelting process, the crushed metal parts are directly added to the melting furnace. Due to the high temperature of the melting furnace, the normal temperature materials are added to the high temperature melting furnace, and the materials are heated from normal temperature to the melting state. A lot of heat, and the heating time is long; the temperature of the material rises instantaneously, it is easy to explode, the burning loss is large, and the quality of the melt is affected; while the combustion waste gas generated by the combustion of the melting furnace is directly discharged, the waste heat is not well utilized, and at the same time also pollute the environment

All of these have caused serious hidden dangers to product quality, energy saving and environmental protection.

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