Formwork roasting furnace with small upper and lower temperature difference

Abstract

The utility model discloses a mould shell roasting furnace with small upper and lower temperature difference, which solves the problems of non-uniform section temperature and the like in the prior art, and is characterized in that a support column (4) and a shed plate (5) are arranged on a furnace bottom (3) of the roasting furnace, and a mould shell (6) is placed on the shed plate (5), so that a lower flame path (7) is formed between the mould shell (6) and the furnace bottom (3), and an upper flame path (9) is formed between the mould shell (6) and a furnace top (14); the upper row of combustors and the lower row of combustors are obliquely and evenly arranged on the planes corresponding to the upper flame path and the lower flame path in a staggered and multi-point mode along the outer ring of the furnace wall of the roasting furnace body (1), and a smoke discharging barrel (11) is arranged in the center of the furnace top. The feeding furnace door (12) and the discharging furnace door (13) are arranged on one side of the furnace wall and controlled to ascend and descend through an automatic control device. The device has the advantages of simple structure, low maintenance rate, reduction of section temperature difference, shortening of heating time, reduction of unit consumption of products, improvement of mold shell quality and the like, effectively reduces the production and operation cost of enterprises, and has very wide market prospects.

Description

Technical Field

[0001] The utility model belongs to the field of high-end mold shell baking production in the precision casting industry, and in particular relates to a mold shell baking furnace with a small upper and lower temperature difference. Background Art

[0002] As the precision casting market continues to expand, the demand for investment casting molds as casting consumables continues to grow. Traditional mold baking furnaces, due to insufficient temperature uniformity across the furnace body, are not suitable for enterprises or working conditions that require high furnace temperature uniformity, and cannot fully meet the production needs of high-end mold products. Utility Model Content

[0003] The purpose of the utility model is to provide a shell baking furnace with a scientific and reasonable structure, uniform cross-section temperature, reduced energy consumption, and stable product quality, thereby meeting the production enterprises' high requirements for temperature uniformity and a small upper and lower temperature difference.

[0004] The present invention comprises a roasting furnace body, a rotating platform, a furnace bottom, burners, a smoke exhaust, a feed door, a discharge door, and a furnace roof. The roasting furnace body is constructed of a high-quality steel frame built with refractory and thermal insulation materials. The rotating platform is driven by a gear reducer with a gear chain, and the furnace bottom rests on the rotating platform. Support columns are provided on the upper surface of the furnace bottom to support the shelf. The formwork is placed on the shelf, forming a lower flue between the furnace bottom and the furnace bottom and an upper flue between the furnace top and the furnace bottom. The burners are all straight-flame, high-speed burners, installed at multiple points along the outer ring of the furnace wall, tilted vertically and staggered vertically. The lower row of burners is evenly distributed on the kiln wall at the lower flue, while the upper row of burners is evenly distributed on the kiln wall at the upper flue. The flames ejected from the upper and lower flues form a high-speed swirl, minimizing cross-sectional temperature differences in the roasting furnace and creating a uniform temperature field around the formwork. The smoke exhaust pipe is set at the center of the furnace top, and the feeding furnace door and the discharging furnace door are set on one side of the furnace wall of the roasting furnace body, and their lifting and lowering are controlled by an automatic control device.

[0005] The beneficial effects of the present invention are as follows: since pillars and shelves are provided on the bottom of the furnace, the mold is placed on the upper surface of the shelf for baking, so that a lower fire channel is formed between the mold and the bottom of the furnace, and an upper fire channel is formed between the mold and the top of the furnace. The flame of the burner does not directly flush the mold, but forms a high-temperature flue gas flow around the mold, heating the mold in all directions without dead angles, reducing the cross-sectional temperature difference between the furnace body and the mold, increasing the temperature uniformity in the furnace and the product, thereby shortening the mold heating time, and improving the thermal utilization rate of the furnace and the quality of the product. Compared with the traditional mold heating furnace in which the mold is placed directly on the trolley surface, this has the advantages of small temperature difference between the upper and lower parts of the furnace, stable mold quality, and low unit energy consumption of the product, effectively reducing the production and operation costs of the enterprise, and has a very broad market prospect.

[0006] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0008] Figure 2 It is a schematic diagram of the top structure of the utility model.

[0009] In the figure: 1 is the roasting furnace body, 2 is the furnace bottom rotating platform, 3 is the furnace bottom, 4 is the pillar, 5 is the shelf, 6 is the mold shell, 7 is the lower fire channel, 8 is the lower row of burners, 9 is the upper fire channel, 10 is the upper row of burners, 11 is the smoke exhaust pipe, 12 is the feeding furnace door, 13 is the discharging furnace door, and 14 is the furnace top. DETAILED DESCRIPTION

[0010] like Figure 1 、 Figure 2As shown, a circular formwork roasting furnace with a small upper and lower temperature difference is constructed as an example. The furnace comprises a roasting furnace body 1, a furnace bottom rotating platform 2, a furnace bottom 3, a burner, a smoke exhaust pipe 11, a feed furnace door 12, a discharge furnace door 13, and a furnace roof 14. The roasting furnace body 1 is constructed of a high-quality steel frame built with refractory insulation materials, resulting in low heat storage and excellent insulation. The furnace bottom rotating platform 2 utilizes a gear reducer with a gear chain drive, providing smooth and reliable transmission. The support pillars 4 and shelf 5 are placed on the furnace bottom 3. The formwork 6 is placed on the shelf 5, forming a lower fire channel 7 between the formwork body 1 and the furnace bottom 3, and an upper fire channel 9 between the formwork body 1 and the furnace roof 14. Both the lower row of burners 8 and the upper row of burners 10 utilize straight-flame, high-velocity burners, staggered and evenly distributed at multiple points along the outer ring of the furnace wall of the roasting furnace body 1. The flame airflow is ejected at high speed along the lower fire channel 7 formed between the mold shell 6 and the furnace bottom, and the upper fire channel 9 formed between the mold shell 6 and the furnace top, stirring the airflow within the furnace and heating the mold shell in all directions without dead angles. This reduces the cross-sectional temperature difference between the furnace body and the mold shell, increases the temperature uniformity within the furnace and the product, and thus shortens the mold shell heating time, improving the thermal efficiency of the furnace and the quality of the product. A smoke exhaust duct 11 is located at the center of the furnace roof 14 to collect and exhaust smoke. The feed furnace door 12 and the discharge furnace door 13 are located on the side of the furnace wall of the roasting furnace body 1. They are electrically lifted and compressed by cylinders, resulting in a small furnace opening and minimal smoke overflow. When implementing the utility model, mold shells 6 of different small cross-sections are first placed in the furnace chamber of the roasting furnace body 1 using a robot, and then the lower row of burners 8 and the upper row of burners 10 are ignited. After each production cycle, the discharge furnace door 13 opens, the robot takes out a baked mold shell 6, and the feed furnace door 12 sends a mold shell raw material into the furnace for baking. This is repeated until all small-section mold shells are continuously baked. The utility model has the advantages of scientific and reasonable structure, uniform cross-sectional temperature, reduced energy consumption, stable product quality, etc., thereby ensuring the firing system of high-end mold shell products, improving the product qualification rate, and effectively reducing the production and operation costs of enterprises. It can also meet the small-batch continuous production of small-section mold shells of different specifications. In actual application, it is not limited to furnace type and can be widely used in various types of kilns such as kiln car tunnel kilns and trolley furnaces. The market prospects are very broad.

[0011] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A shell roasting furnace with a small upper and lower temperature difference, comprising a roasting furnace body (1), a furnace bottom rotating platform (2), a furnace bottom (3), a burner, a smoke exhaust pipe (11), a feed furnace door (12), a discharge furnace door (13) and a furnace top (14), characterized in that: The roasting furnace body (1) is made of high-quality steel frame and built with refractory insulation materials. The furnace bottom rotating platform (2) is driven by a gear reducer with a gear chain. The furnace bottom (3) is placed on the furnace bottom rotating platform (2). A pillar (4) supporting the shelf (5) is set on the upper surface of the furnace bottom (3). The mold shell (6) is placed on the shelf (5) to form a lower fire channel (7) between the furnace bottom (3) and the furnace top (14). The burners are evenly distributed at multiple points along the outer ring of the furnace wall of the roasting furnace body (1). The lower row of burners (8) are evenly distributed and installed on the kiln wall at the lower fire channel (7). The upper row of burners (10) are evenly distributed and installed on the kiln wall at the upper fire channel (9). The smoke exhaust pipe (11) is set at the center of the furnace top (14). The feeding furnace door (12) and the discharging furnace door (13) are set on one side of the furnace wall of the roasting furnace body (1). The lifting and lowering of the burners are controlled by an automatic control device.

2. The shell baking furnace with a small upper and lower temperature difference according to claim 1, characterized in that: The burners all adopt straight flame high-speed burners, which are evenly distributed at multiple points along the normal direction of the outer ring of the furnace wall of the roasting furnace body (1) and are installed on the outer ring furnace wall.

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