CN201157896Y - Casting insulation pit - Google Patents

Abstract

The utility model discloses a heat-preservation pit for castings, which comprises a concrete pit body with a movable cover plate. Insulation layer; a plurality of ventilation holes with covers are opened on the movable cover plate, and air supply and return ports are provided on the side walls of the pit body, and the air supply and return ports pass through the air supply and return air The tube communicates with the circulating hot air device. The casting insulation pit can not only quickly heat the vacant pit body to the required temperature before the casting is hoisted in, but also can keep the temperature around the casting even after the casting is hoisted in, which can fully meet the cooling curve requirements; During use, the heating temperature is adjustable from 0 to 650°C, the heating rate is adjustable from 50 to 100°C/h, the cooling rate is adjustable from 10 to 50°C/h, the temperature uniformity in the pit is ±20°C, and the unpacking time can be shortened by 30 days , greatly shortening the production cycle of the product.

Description

Casting insulation pit

technical field

The utility model relates to a casting insulation pit used for large castings after they are boxed at high temperature.

Background technique

Large castings (such as 4×6×2.5m ³ castings can weigh up to 100 tons, and larger ones can even weigh more than 400 tons) cool down very slowly after casting, especially after dropping to 500-700°C, the cooling speed is even slower. It takes a long time to occupy the work site (if the temperature is too high when punching the box, the casting is prone to cracks, which directly affects the product quality). Then quickly put the casting into the heat preservation pit, spray flames inward through the through hole on the cover plate of the heat preservation pit to heat and cool down. When the temperature is low, open the cover plate manually to control the temperature. Although this method can make large The boxing time of castings is greatly shortened, but due to the direct heating of gas when heating and cooling, the flame temperature is high, and there is no hot air circulation system, the local temperature of castings is too high, the temperature uniformity is poor, and it is difficult to meet the cooling curve requirements, and manual control is required at low temperatures The cover plate is inconvenient to operate, and the cooling curve and temperature uniformity cannot be guaranteed.

Utility model content

The purpose of the utility model is to provide a casting insulation pit which can control the cooling according to the cooling curve.

In order to achieve the above object, the utility model can take the following technical solutions:

The casting thermal insulation pit described in the utility model comprises a pit body made of concrete with a movable cover plate. layer; a plurality of ventilation holes with covers are opened on the movable cover plate, air supply and return air outlets are provided on the side wall of the pit body, and the air supply and return air outlets pass through the air supply and return air ducts Connected with circulating hot air device.

The circulating hot air device is formed by communicating with a negative pressure chamber, a circulating air chamber and a positive pressure chamber. The blades of the circulating fan are arranged in the circulating air chamber; The inlet of the negative pressure chamber is connected with the outlet of the return air pipe, and a heating device and a supplementary air cooling device are arranged in the negative pressure chamber.

The heating device is an electric heating element or/and a combustion chamber.

The refractory insulation layer on the side wall is a refractory fiber insulation layer.

A wind deflector is arranged at the air supply opening opened on the side wall of the pit body.

The utility model has the advantage that air supply and return air outlets are provided on the side wall of the pit body, and the air supply and return air outlets are connected with the circulating hot air device through the air supply and return air pipes; The empty pit body is evenly heated to the required temperature. When the casting is hoisted, the temperature around the casting can be kept uniform all the time, which can fully meet the requirements of the cooling curve; the circulating hot air device consists of a negative pressure chamber, a circulating air chamber and a positive The pressure chambers are connected, and the blades of the circulating fan are set in the circulating air chamber; the outlet of the positive pressure chamber is connected with the air supply pipe, and the inlet of the negative pressure chamber is connected with the return air pipe. The negative pressure chamber is equipped with a heating device and a supplementary air cooling device; when heating and cooling, due to the effect of the heating device, hot air is blown from the outlet of the positive pressure chamber into the pit body through the air supply pipe, and after half a cycle, it passes through the return air pipe Enter the negative pressure chamber to heat, and circulate under the action of the circulating fan blades. Since the heat source is not directly close to the casting, the overheating of the local surface of the casting is avoided. When the temperature drops to a certain level and cooling is required, the heating device is turned off. The circulating fan can send natural wind into the heat preservation pit through the supplementary air cooling device, and the air in the pit is discharged through multiple ventilation holes on the movable cover plate. The whole cooling process is easy to operate, ensuring the uniformity of cooling speed and temperature ;The heating device is set as an electric heating element or/and a combustion chamber, that is, it has two sets of heating systems at the same time, and two energy sources, natural gas and fuel oil, can be fed into the combustion chamber, and the scope of application is wider; the refractory insulation layer on the side wall of the pit body It is set as a refractory fiber insulation layer, which can reduce the heat absorption and heat conduction loss of the pit wall by more than 50%, which greatly saves energy consumption; Control the hot air blowing into the pit from both sides to make the hot air circulate more smoothly. The thermal insulation pit described in the utility model (the effective size of the pit is 7500×9000×4500mm ³ ) is in use, the heating temperature is adjustable from 0 to 650°C, the heating rate is adjustable from 50 to 100°C/h, and the cooling rate is adjustable 10--50°C/h adjustable, the temperature uniformity in the pit is ±20°C, and the unboxing time can be shortened by 30 days, which greatly shortens the production cycle of the product.

Description of drawings

Fig. 1 is the structural representation of the utility model.

FIG. 2 is a top view of FIG. 1 .

Fig. 3 is a sectional view taken along line A-A of Fig. 1 .

Detailed ways

As shown in Figures 1, 2, and 3, the casting insulation pit described in the utility model includes a pit body 2 built by concrete with a split movable cover plate 1, and the bottom wall of the pit body 2 The upper layer is laid with a load-bearing heat-insulating layer constructed of heat-insulating floor tiles 20 and sandy soil layer 21, and the side wall is provided with a refractory fiber heat-insulating layer 3; on the movable cover plate 1, there are a plurality of ventilation holes 4 with covers. , on the side wall of the pit body 2, there are air supply and return air outlets 5,6, and the air supply and return air outlets 5,6 are communicated with the circulating hot air device 9 through the air supply and return air pipes 7,8. The circulating hot air device 9 is formed by communicating with a negative pressure chamber 10, a circulating air chamber 11 and a positive pressure chamber 12, and the blades 14 of the circulating fan 13 are arranged in the circulating air chamber 11; the positive pressure chamber 12 The outlet 15 of the negative pressure chamber 10 is connected to the 7 ports of the air supply pipe, and the inlet 16 of the negative pressure chamber 10 is connected to the 8 ports of the return air pipe. The negative pressure chamber 10 is provided with two sets of heating elements consisting of an electric heating element 17 and a combustion chamber 18. device and supplementary air cooling device; in order to ensure the smooth flow of circulating hot air, a wind deflector 19 is provided at the air supply port 5 opened on the side wall of the pit body 2 .

Claims (5)

1. A casting insulation pit, comprising a concrete pit body (2) with a movable cover plate (1), the bottom wall of the pit body (2) is laid with a load-bearing heat insulation layer, A refractory insulation layer (3) is provided on the side wall; a plurality of ventilation holes (4) with covers are opened on the movable cover plate (1), and it is characterized in that: in the pit body (2) There are air supply and return air outlets (5, 6) on the side wall, and the air supply and return air outlets (5, 6) communicate with the circulating hot air device (9) through the air supply and return air pipes (7, 8). 2. The heat preservation pit for castings according to claim 1, characterized in that: the circulating hot air device (9) consists of a negative pressure chamber (10), a circulating air chamber (11) and a positive pressure chamber (12) The blades (14) of the circulating fan (13) are arranged in the circulating air chamber (11); the outlet (15) of the positive pressure chamber (12) is connected to the mouth of the air supply pipe (7) Connected, the inlet (16) of the negative pressure chamber (10) is connected with the mouth of the return air pipe (8), and a heating device and a supplementary air cooling device are arranged in the negative pressure chamber (10). 3. The casting insulation pit according to claim 2, characterized in that: said heating device is an electric heating element (17) or/and a combustion chamber (18). 4. The casting insulation pit according to claim 1, characterized in that: the refractory insulation layer (3) on the side wall is a refractory fiber insulation layer. 5. The heat preservation pit for castings according to claim 1, characterized in that: a wind deflector (19) is provided at the air outlet (5) opened on the side wall of the pit body (2).

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