Air heater

Abstract

The invention belongs to the field of treatment of a casting mould or a mold core, and relates to an air heater which is connected with a hot core box. The air heater comprises a compressed air source, an airflow pipe and a burner, wherein the airflow pipe comprises an air inlet section, a spiral section and an air outlet section in sequence according to the flowing sequence of the compressed air; the air inlet section is connected with the compressed air source and is provided with a pressure regulating valve; the spiral section is arranged in a heat insulation box body; a flaming nozzle of the burner is also arranged in the heat insulation box body and is opposite to the spiral section; the air outlet section is opposite to a sand injection hole of the hot core box. Compared with a traditional heating mode by an electric heat-conduction pipe, the heating mode of the air heater has the advantages that the air heater does not have the phenomenon of local overheating and is more uniform in heating; furthermore, the hot core box can be heated only by connecting the air outlet section with the sand injection hole; compared with a heat transfer plate, the air heater is simpler to install.

Description

technical field [0001] The invention belongs to the field of treatment of molds or cores. Background technique [0002] The traditional hot core box core-making process is to inject the mixed molding sand into the core box with a heating temperature of 180-260 °C under a certain pressure (generally 0.3-0.5 MPa) by means of a core shooter. The heat conduction effect of the contact surface between the mold and the sand core is a core-making process in which the temperature is gradually raised from the surface of the sand core in the core box from the outside to the inside to form a hardened core. The hot core box is composed of core box body, loose block, positioning device, heating device, exhaust device, ejection mechanism and other parts. There are two ways of heating the hot core box, electric heating and combustible gas heating, but in actual production, electric The application of heating is more common, and its characteristics are uniform heat and stable temperature ri...

AI Technical Summary

Problems solved by technology

The disadvantages of the above solution are: ①The way of burying the heating pipe in the mold may cause local overheating of the mold, and the heat cannot be evenly transferred to the molding sand in the mold. If an electric heating plate is used, it is likely to cause thermal stress. The gap between the electric heating plate and the core box increases, which affects the heat transfer effect and the precision of mold clamping, and also increases the difficulty of disassembling and assembling the heating tube; ②The heating temperature of the hot core box is basically kept above 200°C, and the electric heating method cannot guarantee Such a continuous high temperature, and the use of gas direct heating can not accurately control the temperature

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