Circulating hot air sand core surface drying furnace

Abstract

The invention discloses a circulating hot air sand core surface drying furnace. The circulating hot air sand core surface drying furnace comprises a furnace body and a heater. The heater is located in a heater chamber. An air feeding port and an air return port are formed in the bottom of the heater chamber. A hot air circulating system is located below the top of the furnace body, the air feeding port and the air return port. The hot air circulating system comprises a circulating fan and an air feeding pipe located at the top of the furnace body. An air outlet of the circulating fan is communicated with the air feeding port. An air blowing nozzle is arranged at the bottom of the air feeding pipe. Waste discharging devices are symmetrically arranged at the two ends of the upper portion of the air feeding pipe. Air return pipes are symmetrically arranged on the two sides of the air feeding pipe and communicated with the heater chamber through the air return port in the bottom of the heater chamber. By the adoption of the circulating hot air sand core surface drying furnace, a workpiece is dried in a forced hot air circulating manner, and the structure that air is fed through the top and returned through the two sides is adopted in hot air circulation, so that the workpiece is heated evenly, the temperature is proper, and the drying speed is increased; and the waste discharging devices are arranged in the furnace body so that moisture in the furnace body can be removed in time and the drying speed can be further increased.

Description

technical field [0001] The invention relates to the technical field of sand core drying equipment, in particular to a circulating hot air sand core surface drying furnace. Background technique [0002] The water content of the resin sand mold (core) is relatively low, generally 0.2-0.3%, and its water content has no effect on the quality of the casting, but the water penetration depth after coating is generally 6-8mm. In order to meet the production process requirements, the existing technology uses The drying methods are as follows: 1. Direct baking type, that is, the sand core is dried in the oven, the surface is dried but the inside of the core cannot be dried, and the heat storage of the sand core is large; 2. The sand core is directly put into the oven. Baking in a stirring and heating oven with a stirring fan, although the surface of the sand core can be dried as soon as possible by blowing and heating the wind, but due to the irregularity of the sand mold itself, it i...

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