Heated air circulation structure of trolley furnace

Abstract

The utility model relates to the field of industrial furnaces, and particularly discloses a trolley furnace hot air circulation structure which comprises a furnace body outer shell, a heat preservation inner shell and a material table, supporting columns are arranged at the bottom of the furnace body outer shell, the heat preservation inner shell is located in the furnace body outer shell, a heat preservation layer is arranged between the heat preservation inner shell and the furnace body outer shell, and a heating device installation groove is formed in the inner wall of the furnace body outer shell. A plurality of air inlets are formed in the bottom of the heating device mounting groove; a plurality of ventilation openings are formed in the top of the heat preservation inner shell; a pulley block is arranged at the bottom of the material table; an exhaust opening is formed in the material table; and then the hot air is exhausted through the exhaust port in the material table, the workpieces on the material table can be evenly heated under blowing of the hot air, the problem that the annealing quality is reduced due to uneven heating of the workpieces is avoided, and the cooling rate can be increased through air circulation during annealing.

Description

Technical Field

[0001] This utility model relates to the field of industrial furnaces, specifically to a hot air circulation structure for a bogie furnace. Background Technology

[0002] The bogie hearth furnace is a national standard energy-saving periodic furnace with an ultra-energy-efficient structure. It utilizes composite fiber insulation, ultra-lightweight, high-strength micro-bead vacuum ball energy-saving bricks, and exclusively produces 20° inclined wire-supporting bricks to prevent wire loss. It also features workpiece impact protection bricks at the furnace mouth, an automatically sealing bogie and furnace door, and an integrated track system, requiring no foundation installation and can be used simply by placing it on a level surface. It is mainly used for quenching, annealing, aging, and heat treatment of high-chromium, high-manganese steel castings, gray cast iron parts, ductile iron parts, rolls, steel balls, crusher hammers, wear-resistant liners, and various mechanical parts.

[0003] To improve heating efficiency and ensure uniform heating of workpieces, a hot air circulation annealing furnace is used. A trolley-type circulating hot air annealing furnace with patent number CN207210476U uses an isolation hood inside the furnace chamber to ensure uniform heating of workpieces located inside the isolation hood. However, this method reduces the cooling rate of workpieces inside the isolation hood, and some workpieces cannot be annealed. Therefore, a trolley furnace structure that can both heat the entire furnace and adjust the cooling rate is needed. Utility Model Content

[0004] This utility model aims to solve the technical problems mentioned in the background section above, and proposes the following technical solutions:

[0005] A hot air circulation structure for a bogie furnace includes a furnace outer shell, an insulated inner shell, and a material platform. A support column is provided at the bottom of the furnace outer shell. The insulated inner shell is located inside the furnace outer shell, and an insulation layer is provided between the inner shell and the furnace outer shell. A heating device mounting groove is provided on the inner wall of the furnace outer shell, and a heating device is installed in the groove. Several air inlets are provided at the bottom of the mounting groove. Several ventilation openings are provided at the top of the insulated inner shell. A pulley system is provided at the bottom of the material platform, and an exhaust port is provided on the material platform.

[0006] Preferably, a filter screen is provided on the air inlet.

[0007] Preferably, the material platform is provided with sliding grooves on the left and right sides, and the furnace body shell is provided with a groove at the corresponding position on the bottom. A baffle is provided in the groove, and a plurality of first springs are provided on the top of the baffle. One end of the first spring is fixedly connected to the bottom of the groove, and the bottom of the baffle is located in the sliding groove.

[0008] Preferably, the outer periphery of the baffle is provided with a heat insulation layer.

[0009] Preferably, the bottom of the material platform is provided with an exhaust pipe, the exhaust pipe is located on the exhaust port, and a fan is provided inside the exhaust pipe.

[0010] The beneficial effects of the utility model are:

[0011] 1. By setting up an outer shell and an inner insulated shell, an air inlet is set at the bottom of the heating device mounting slot. Air will enter the trolley furnace through the air inlet and be heated by the heating device. Ventilation vents are set on the inner insulated shell and exhaust vents are set at the bottom of the material platform. The heated air will be blown to the material platform through the ventilation vents and then discharged through the exhaust vents on the material platform. The workpieces on the material platform will be heated evenly under the blowing of hot air, avoiding the problem of uneven heating of workpieces leading to a reduction in annealing quality. The cooling rate can also be improved by air circulation during annealing.

[0012] 2. By installing a baffle at the bottom of the furnace shell and controlling the baffle to move up and down with a spring, the gap between the material platform and the furnace shell can be blocked to prevent heat leakage.

[0013] 3. By installing an exhaust pipe at the exhaust port and a fan inside the exhaust pipe, the speed of hot air circulation inside the trolley furnace can be increased, thereby increasing the heating rate of the workpiece. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0015] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of this utility model;

[0016] Figure 3 for Figure 2 Enlarged view of the area circled in the middle;

[0017] Figure 4 This is a schematic diagram of the structure of Embodiment 3 of this utility model.

[0018] In the diagram: 1. Furnace outer shell; 1-1. Support column; 1-2. Heating device mounting slot; 1-3. Groove; 2. Insulated inner shell; 2-1. Ventilation opening; 3. Material platform; 3-1. Pulley block; 3-2. Exhaust port; 3-3. Slide groove; 4. Insulation layer; 5. Heating device; 6. Air inlet; 7. Filter screen; 8. Baffle; 9. Spring; 10. Exhaust pipe; 11. Fan. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] In the description of this utility model, it should be understood that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The connection methods described by the terms "fixed connection" and "fixed setting" include, but are not limited to, "welding," "riveting," "adhesion," and "threaded connection." The terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0021] The terms “upper,” “lower,” “front,” “back,” “left,” “right,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Example 1

[0023] Reference Figure 1 A hot air circulation structure for a bogie furnace includes a furnace outer shell 1, an insulated inner shell 2, and a material platform 3. A support column 1-1 is provided at the bottom of the furnace outer shell 1. The insulated inner shell 2 is located inside the furnace outer shell 1. An insulation layer 4 is provided between the insulated inner shell 2 and the furnace outer shell 1. A heating device mounting groove 1-2 is provided on the inner wall of the furnace outer shell 1. A heating device 5 is installed in the heating device mounting groove 1-2. Several air inlets 6 are provided at the bottom of the heating device mounting groove 1-2. Several ventilation openings 2-1 are provided at the top of the insulated inner shell 2. A pulley group 3-1 is provided at the bottom of the material platform 3. An exhaust port 3-2 is provided on the material platform 3.

[0024] Preferably, a filter screen 7 is provided on the air inlet 6.

[0025] In actual operation, the workpiece to be annealed is placed on the material platform 3, and then the material platform is pushed into the furnace shell 1 by the pulley group 3-1 at the bottom of the material platform. After the furnace shell 1 is closed, the heating device 5 is turned on. At this time, air will enter the furnace shell 1 from the air inlet 6, pass through the insulation layer 4, and then enter the insulation inner shell 2 through the ventilation port 2-1 on the insulation inner shell 2. Finally, it will be discharged from the exhaust port 3-2. During this period, hot air will continuously blow onto the workpiece located on the material platform 3, so that the temperature rise rate of the workpiece is higher than that of ordinary bogie furnaces.

[0026] Example 2

[0027] Reference Figure 2 The material platform 3 is provided with sliding grooves 3-3 on the left and right sides. The furnace shell 1 is provided with grooves 1-3 at the corresponding positions at the bottom. A baffle 8 is provided in the groove 1-3. Several first springs 9 are provided on the top of the baffle 8. One end of the first spring 9 is fixedly connected to the bottom of the groove 1-3. The bottom of the baffle 8 is located in the sliding groove 3-3.

[0028] Preferably, a heat insulation layer 8-1 is provided on the outer periphery of the baffle 8.

[0029] Example 3

[0030] Reference Figure 3 The bottom of the material platform 3 is equipped with an exhaust pipe 10, which is located on the exhaust port 3-2. A fan 11 is installed inside the exhaust pipe 10.

Claims

1. A hot air circulation structure for a bogie furnace, comprising a furnace outer shell (1), an insulated inner shell (2), and a material platform (3), characterized in that, The furnace shell (1) is provided with a support column (1-1) at the bottom. The heat-insulating inner shell (2) is located inside the furnace shell (1). A heat-insulating layer (4) is provided between the heat-insulating inner shell (2) and the furnace shell (1). A heating device mounting groove (1-2) is provided on the inner wall of the furnace shell (1). A heating device (5) is provided in the heating device mounting groove (1-2). Several air inlets (6) are provided at the bottom of the heating device mounting groove (1-2). Several ventilation openings (2-1) are provided at the top of the heat-insulating inner shell (2). A pulley group (3-1) is provided at the bottom of the material platform (3). An exhaust port (3-2) is provided on the material platform (3).

2. The hot air circulation structure of a bogie hearth furnace according to claim 1, characterized in that, A filter screen (7) is provided on the air inlet (6).

3. The hot air circulation structure of a bogie hearth furnace according to claim 2, characterized in that, The material platform (3) is provided with sliding grooves (3-3) on the left and right sides. The furnace shell (1) is provided with a groove (1-3) at the corresponding position at the bottom. A baffle (8) is provided in the groove (1-3). Several springs (9) are provided on the top of the baffle (8). One end of the spring (9) is fixedly connected to the bottom of the groove (1-3). The bottom of the baffle (8) is located in the sliding groove (3-3).

4. The hot air circulation structure of a bogie hearth furnace according to claim 3, characterized in that, A heat insulation layer (8-1) is provided on the outer periphery of the baffle (8).

5. The hot air circulation structure of a bogie hearth furnace according to claim 2, characterized in that, The material platform (3) is provided with an exhaust pipe (10) at the bottom. The exhaust pipe (10) is located on the exhaust port (3-2). A fan (11) is provided inside the exhaust pipe (10).

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