Casting parts thermal insulation pit

Abstract

The invention discloses a cast thermal insulation ground pit, comprising a ground pit body with a movable cover plate built with concrete. A bearing thermal insulation layer is applied on the bottom of the ground pit, and a flame-proof thermal insulation layer is disposed on the side wall. A plurality of vents with covers are disposed on the movable cover plate, and an air vent and an air-return vent, both of which communicate with a circulating hot-air device via an air pipe and an air return pipe, are disposed on the side wall of the ground pit. Not only the empty cast thermal insulation ground pit can be heated to a required temperature quickly and evenly before the casts are hung in, but also the temperature around the cast can be kept even to the end after the casts are hung in, and cooling-curve request is satisfied completely. When the ground pit is used, the heating-up temperature is adjustable in the range of 0-650 DEG C, the heating-up velocity is adjustable in the range of 50-100 DEG C / h, the cooling velocity is adjustable in the range of 10-50 DEG C / h, and temperature uniformity in pit is +-20 DEG C. Case opening period is shortened by 30 days, so that the production period is greatly shortened.

Description

technical field [0001] The invention relates to a casting insulation pit used for large castings after being boxed at high temperature. Background technique [0002] Large castings (such as 4 × 6 × 2.5m 3 The weight of castings can reach 100 tons, and the larger ones even weigh more than 400 tons). If the temperature is too high, the castings are prone to cracks, which directly affects the product quality). In response to this problem, on the premise of ensuring product quality, in order to improve the turnover rate of the work site, high temperature boxing is used, and then the castings are quickly put into the heat preservation pit In the heat preservation pit, flames are sprayed inward through the holes on the upper cover of the heat preservation pit to heat and cool down. When the temperature is low, the cover is manually opened to control the temperature. Direct heating with gas is used for cooling, the flame temperature is high, and there is no hot air circulation sy...

AI Technical Summary

Problems solved by technology

[0002] Large castings (such as 4 × 6 × 2.5m 3 The weight of castings can reach 100 tons, and the larger ones even weigh more than 400 tons). If the temperature is too high, the castings are prone to cracks, which directly affects the product quality). In response to this problem, on the premise of ensuring product quality, in order to improve the turnover rate of the work site, high temperature boxing is used, and then the castings are quickly put into the heat preservation pit In the heat preservation pit, flames are sprayed inward through the holes on the upper cover of the heat preservation pit to heat and cool down. When the temperature is low, the cover is manually opened to control the temperature. Direct heating with gas is used for cooling, the flame temperature is high, and there is no hot air circulation system, which makes the local temperature of the casting too high and the temperature uniformity is poor, which makes it difficult to meet the requirements of the cooling curve. temperature uniformity

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