Roller hearth high temperature electric heating furnace composite lining structure

Abstract

The utility model discloses a kind of roller bottom high-temperature electric heating furnace composite furnace lining structure, comprising: feeding mechanism, including base and the roller way transmission device being installed on base, and roller way transmission device is driven by motor;Heating assembly, including the first electric heating device being located below roller way transmission device and being installed on base, and the second electric heating device being located above roller way transmission device and being hoisted on base;Assembly type furnace lining, it includes multiple detachably connected furnace body unit, each furnace body unit includes first furnace body and second furnace body;First furnace body is arranged below roller way transmission device, and second furnace body is arranged above roller way transmission device;Among them, second furnace body is matched with the tenon on first furnace body through the mortise on it, to detachably connect first furnace body and second furnace body, to form furnace body unit. The structure is high in modular degree, reliable in connection and convenient for on-site installation and local replacement.

Description

Technical Field

[0001] This utility model relates to the field of industrial heat treatment equipment technology, and in particular to a composite furnace lining structure for a roller hearth type high-temperature electric heating furnace. Background Technology

[0002] Roller hearth heat treatment furnaces are key industrial equipment in the metallurgical and machinery manufacturing fields, used for continuous annealing, quenching, normalizing, and other heat treatment processes on metal workpieces. These furnaces transport workpieces via continuously rotating internal roller conveyors, allowing them to undergo heating, holding, and cooling processes within a sealed furnace chamber to meet specific material performance requirements. The furnace lining structure, as a crucial component of the roller hearth furnace, functions to create a high-temperature treatment space and reduce heat loss. Traditional furnace linings are often formed using integral casting or refractory brick masonry methods. Their structural stability and ease of maintenance under long-term high-temperature conditions remain ongoing engineering challenges in this field.

[0003] In existing roller hearth electric heating furnace structures, the furnace lining is usually fixedly connected to the furnace frame or integrally formed. When the furnace lining is damaged locally due to high temperature, oxidation, or mechanical impact, a large-scale dismantling operation is often required, the maintenance process is time-consuming, and may affect the continuity of production.

[0004] Therefore, it is necessary to design a composite furnace lining structure that is highly modular, reliably connected, and easy to install and replace on site. Utility Model Content

[0005] In view of the above situation and to overcome the defects of the prior art, this utility model provides a composite furnace lining structure for a roller hearth high-temperature electric heating furnace. This structure has a high degree of modularity, reliable connection, and is easy to install and replace on site.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model provides a composite furnace lining structure for a roller hearth type high-temperature electric heating furnace, comprising:

[0008] The feeding mechanism includes a base and a roller conveyor mounted on the base, the roller conveyor being driven by a motor;

[0009] The heating assembly includes a first electric heating device located below the roller conveyor and mounted on the base, and a second electric heating device located above the roller conveyor and suspended on the base;

[0010] A prefabricated furnace lining includes multiple detachably connected furnace body units, each of which includes a first furnace body and a second furnace body.

[0011] The first furnace body is located below the roller conveyor device, and the second furnace body is located above the roller conveyor device;

[0012] in,

[0013] The second furnace body is connected to the first furnace body by means of a tenon on the second furnace body engaging with a tenon on the first furnace body, thereby forming the furnace body unit.

[0014] Furthermore, the tenon and the convex tenon are interference fits, and the interference amount is not less than 0.2mm.

[0015] Furthermore, the surface of the tenon is provided with a flexible pad with a thickness of not less than 2 mm.

[0016] Furthermore, the first furnace body is provided with a first connecting part on both sides, and the first connecting part is provided with a screw hole;

[0017] The second furnace body is provided with second connecting parts on both sides, and the second connecting parts are provided with screw holes, and the positions of the second connecting parts correspond to those of the first connecting parts;

[0018] The first connecting part and the second connecting part are connected by bolts to fasten the first furnace body and the second furnace body.

[0019] Furthermore, a sliding groove is provided on one side of the first furnace body, and a sliding rail is provided on the other side;

[0020] The second furnace body has a sliding groove on one side and a sliding rail on the other side;

[0021] in,

[0022] The first furnace body and the second furnace body in adjacent furnace body units are detachably connected by the sliding engagement of the slide groove and the slide rail to form the assembled furnace lining.

[0023] Furthermore, the inner surfaces of the first furnace body and the second furnace body are provided with a heat-reflective layer with a thickness of not less than 20 mm.

[0024] Furthermore, the second furnace body is provided with lifting lugs for hoisting.

[0025] This utility model has at least the following advantages or beneficial effects:

[0026] This invention employs a prefabricated furnace lining structure, comprising multiple detachably connected furnace body units. Each furnace body unit is connected by a first furnace body and a second furnace body via a tenon and mortise joint, facilitating modular assembly and disassembly. It also incorporates a feeding mechanism and heating components. The feeding mechanism includes a base and a roller conveyor, ensuring stable workpiece transport. The heating components include a first electric heating device and a second electric heating device, providing simultaneous heating from both above and below to improve temperature uniformity. Overall, this invention improves the ease of furnace lining maintenance and installation efficiency.

[0027] This invention employs a structure where a sliding groove is provided on one side and a sliding rail on the other side of the first and second furnace bodies. Adjacent furnace body units are connected by sliding engagement between the sliding groove and the sliding rail, enabling rapid assembly and disassembly. Overall, this invention improves the installation efficiency and modularity of prefabricated furnace linings. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A schematic diagram of the composite furnace lining structure of a roller hearth type high-temperature electric heating furnace;

[0030] Figure 2 for Figure 1 Right view of the composite furnace lining structure of a medium roller hearth high-temperature electric heating furnace;

[0031] Figure 3 This is a schematic diagram of the feeding mechanism;

[0032] Figure 4 This is a schematic diagram of the furnace body unit;

[0033] Figure 5 for Figure 4 Right view of the middle furnace unit.

[0034] Figure label:

[0035] 1-Feeding mechanism; 11-Base; 12-Roller conveyor;

[0036] 2-Heating component; 21-First electric heating device; 22-Second electric heating device;

[0037] 3-Assembled furnace lining; 31-Furnace body unit; 311-First furnace body; 312-Second furnace body; 313-Tongue; 314-Tongue; 315-First connecting part; 316-Second connecting part; 317-Slide groove; 318-Slide rail; 319-Lifting lug. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0039] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] In this utility model, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the structural relationship between the various parts or elements of this utility model and do not specifically refer to any part or element in this utility model. They should not be construed as limitations on this utility model.

[0042] In this utility model, terms such as "fixed", "connected", and "linked" should be interpreted broadly, indicating that it can be a fixed connection, an integral connection, or a detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. For relevant scientific researchers or technicians in this field, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and should not be construed as a limitation of this utility model.

[0043] The embodiments of this utility model will be described in detail below.

[0044] This utility model embodiment discloses a composite furnace lining structure for a roller-bottom type high-temperature electric heating furnace.

[0045] The composite furnace lining structure of the roller hearth high-temperature electric heating furnace provided in this embodiment improves the traditional integral furnace lining into a modular structure composed of multiple detachable furnace body units 31 by adopting an assembled furnace lining structure. Each furnace body unit 31 is connected by a first furnace body 311 and a second furnace body 312 through the engagement of a tenon 313 and a tenon 314. This construction method makes the installation and maintenance of the furnace lining more convenient. When a furnace body unit 31 is damaged, only the corresponding module needs to be replaced, without removing the entire furnace lining, thereby reducing maintenance time and costs. Details are as follows:

[0046] Figure 1 A schematic diagram of the composite furnace lining structure of a roller hearth type high-temperature electric heating furnace; Figure 2 for Figure 1 Right view of the composite furnace lining structure of a medium roller hearth high-temperature electric heating furnace; Figure 3 This is a schematic diagram of the feeding mechanism.

[0047] The feeding mechanism 1 includes a base 11 and a roller conveyor 12 mounted on the base 11.

[0048] The base 11 serves to provide a stable support foundation for the entire furnace body and to withstand the mechanical loads during equipment operation.

[0049] The roller conveyor 12 is driven by a motor, and its function is to transmit the motor torque to the rollers through a reduction mechanism to achieve continuous conveying of workpieces. The manufacturing method of this device includes assembling the rollers with self-aligning roller bearings and connecting them to a reducer via a coupling. In this embodiment, the roller conveyor 12 is driven by a three-phase asynchronous motor in conjunction with a worm gear reducer, and the roller surface is chrome-plated to improve wear resistance; in other embodiments, the roller conveyor 12 may also employ a servo motor in conjunction with a planetary gear reducer.

[0050] The heating assembly 2 includes a first electric heating device 21 located below the roller conveyor 12 and mounted on the base 11, and a second electric heating device 22 located above the roller conveyor 12 and suspended on the base 11. The first electric heating device 21 radiates heat to the bottom area of ​​the workpiece; the second electric heating device 22 convects heats the upper area of ​​the workpiece. The combination of these two devices improves the uniformity of temperature distribution within the furnace. In this embodiment, both the first electric heating device 21 and the second electric heating device 22 use nickel-chromium alloy resistance band heating elements; in other embodiments, the first electric heating device 21 and the second electric heating device 22 may also use molybdenum disilicide heating elements or silicon carbide heating rods. During installation, the first electric heating device 21 is fixed to the base 11 by a bracket, and the second electric heating device 22 is suspended from the upper frame by a hanging rod; the distance between the two devices can be adjusted according to process requirements.

[0051] Figure 4 Schematic diagram of furnace body unit 31; Figure 5 for Figure 4 Right view of furnace body unit 31.

[0052] The prefabricated furnace lining 3 includes multiple detachably connected furnace body units 31. Each furnace body unit 31 includes a first furnace body 311 and a second furnace body 312.

[0053] The first furnace body 311 is positioned below the roller conveyor 12, and the second furnace body 312 is positioned above the roller conveyor 12. This split structure facilitates independent replacement and maintenance of specific sections of the furnace lining. In this embodiment, there are ten furnace body units 31, each with a length of 1200 mm; in other embodiments, there may be eight or twelve furnace body units 31, with unit lengths selectable within the range of 800-1500 mm. The wall thickness of the first furnace body 311 and the second furnace body 312 is designed to be 150 mm; in other embodiments, the wall thickness may be adjusted between 120-200 mm to accommodate different insulation requirements.

[0054] The second furnace body 312 engages with the tenon 313 on the first furnace body 311 via a recessed tenon 314, thereby detachably connecting the first furnace body 311 and the second furnace body 312 to form a furnace body unit 31. The function of the tenon 313 and the recessed tenon 314 is to achieve precise alignment and initial fixation of the upper and lower furnace body units. Their engagement mechanism restricts relative displacement through the interlocking effect of geometric shapes. In this embodiment, the cross-section of the tenon 313 is an isosceles trapezoid with a height of 50 mm and a base width of 40 mm; in other embodiments, the cross-section of the tenon 313 can also be rectangular or dovetail-shaped, and the height can be selected within the range of 30-60 mm.

[0055] A flexible pad with a thickness of not less than 2 mm is provided on the surface of the tenon 314. The function of the flexible pad is to compensate for manufacturing tolerances and absorb thermal deformation, while improving the airtightness of the joint interface. Its manufacturing method includes bonding a pre-formed pad to the surface of the tenon using a high-temperature adhesive. In this embodiment, the flexible pad is made of high-purity alumina ceramic fiber felt; in other embodiments, the flexible pad can also be made of graphite woven tape or aluminosilicate fiber paper, with a thickness selectable in the range of 2-5 mm. This structure, through the compression resilience of the flexible material, can alleviate thermal stress concentration to a certain extent.

[0056] The tenon 314 and the tenon 313 are in an interference fit, with an interference amount of not less than 0.2 mm. This interference fit utilizes elastic deformation to generate a preload, enhancing the stability of the connection under thermal cycling conditions. In this embodiment, the interference amount is 0.2 mm; in other embodiments, the interference amount can be 0.25 mm or 0.3 mm, with the specific value determined based on the material's coefficient of thermal expansion.

[0057] The first furnace body 311 has two first connecting portions 315 on both sides, each with a screw hole. The second furnace body 312 has two second connecting portions 316 on both sides, each with a screw hole, and the second connecting portions 316 correspond to the positions of the first connecting portions 315. The first connecting portions 315 and the second connecting portions 316 are connected by bolts to secure the first furnace body 311 and the second furnace body 312. The function of the first connecting portions 315 and the second connecting portions 316 is to provide mechanical locking force to prevent the mortise and tenon structure from loosening under vibration. In this embodiment, there are two of each of the first connecting portions 315 and the second connecting portions 316, connected by bolts; in other embodiments, the number of connecting portions may be three or four.

[0058] The first furnace body 311 has a sliding groove 317 on one side and a sliding rail 318 on the other side; the second furnace body 312 has a sliding groove 317 on one side and a sliding rail 318 on the other side. The first furnace body 311 and the second furnace body 312 in adjacent furnace body units 31 are detachably connected via the sliding engagement of the sliding groove 317 and the sliding rail 318 to form a prefabricated furnace lining 3. The sliding groove 317 and the sliding rail 318 guide the precise docking between modules and withstand the axial force generated by thermal expansion. The inner surface of the sliding groove 317 is lined with a graphite lubricating plate to reduce sliding friction resistance.

[0059] The inner surfaces of the first furnace body 311 and the second furnace body 312 are provided with a heat-reflective layer (not shown in the figure) with a thickness of not less than 20 mm. The function of the heat-reflective layer is to reduce radiative heat transfer loss by increasing the surface reflectivity. Its working principle is based on the high reflectivity of the material to infrared radiation. The coating is manufactured by using a plasma spraying process to laminate powder material onto the substrate surface. In this embodiment, the heat-reflective layer is a zircon-based refractory coating; in other embodiments, the heat-reflective layer can also be a magnesium oxide-alumina composite coating or a silicon carbide-based coating, and the thickness can be selected in the range of 20-30 mm.

[0060] The second furnace body 312 is equipped with lifting lugs 319 for hoisting. The function of the lifting lugs 319 is to provide lifting points, facilitating the handling and positioning of the furnace body unit using hoisting equipment. Copper sleeves are embedded in the holes of the lifting lugs to reduce wear on the wire ropes.

[0061] Overall, this utility model combines the following features: the base 11 of the feeding mechanism 1 cooperates with the roller conveyor 12; the heating components 2 are arranged vertically; the modular design of the assembled furnace lining 3 is incorporated; the interference fit of the tenon 313 and the tenon 314 is achieved; the bolts fasten the first connecting part 315 and the second connecting part 316; the guiding connection of the slide groove 317 and the slide rail 318 is provided; the heat-reflective layer enhances insulation; and the lifting lug 319 provides hoisting functionality. These features work together to improve the maintainability and installation accuracy of the furnace lining structure, reduce the workload of disassembly and assembly during partial maintenance, and have a positive effect on extending equipment service life and reducing downtime. Through modular design, when a furnace body unit 31 is damaged, the corresponding module can be replaced without dismantling the entire furnace lining structure. This design concept has application value in the field of equipment maintenance.

[0062] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A composite furnace lining structure for a roller hearth type high-temperature electric heating furnace, characterized in that, include: The feeding mechanism (1) includes a base (11) and a roller conveyor (12) mounted on the base (11), the roller conveyor (12) being driven by a motor; The heating assembly (2) includes a first electric heating device (21) located below the roller conveyor (12) and mounted on the base (11), and a second electric heating device (22) located above the roller conveyor (12) and suspended on the base (11). The prefabricated furnace lining (3) includes multiple detachably connected furnace body units (31), each of the furnace body units (31) including a first furnace body (311) and a second furnace body (312). The first furnace body (311) is located below the roller conveyor (12), and the second furnace body (312) is located above the roller conveyor (12); in, The second furnace body (312) is connected to the first furnace body (311) by means of a tenon (314) on it and a tenon (313) on it, so as to detachably connect the first furnace body (311) and the second furnace body (312), thereby forming the furnace body unit (31).

2. The composite furnace lining structure of the roller hearth type high-temperature electric heating furnace according to claim 1, characterized in that, The recessed tenon (314) and the protruding tenon (313) are interference fits, and the interference amount is not less than 0.2mm.

3. The composite furnace lining structure of the roller hearth type high-temperature electric heating furnace according to claim 1, characterized in that, The surface of the tenon (314) is provided with a flexible pad with a thickness of not less than 2 mm.

4. The composite furnace lining structure of the roller hearth type high-temperature electric heating furnace according to claim 1, characterized in that: The first furnace body (311) is provided with a first connecting part (315) on both sides, and the first connecting part (315) is provided with a screw hole; The second furnace body (312) is provided with a second connecting part (316) on both sides. The second connecting part (316) is provided with a screw hole, and the second connecting part (316) corresponds to the position of the first connecting part (315). The first connecting part (315) and the second connecting part (316) are connected by bolts to fasten the first furnace body (311) and the second furnace body (312).

5. The composite furnace lining structure of the roller hearth type high-temperature electric heating furnace according to claim 1, characterized in that: The first furnace body (311) is provided with a slide groove (317) on one side and a slide rail (318) on the other side. The second furnace body (312) is provided with a slide groove (317) on one side and a slide rail (318) on the other side. in, The first furnace body (311) and the second furnace body (312) in adjacent furnace body units (31) are detachably connected to form the assembled furnace lining (3) through the sliding engagement of the slide groove (317) and the slide rail (318).

6. The composite furnace lining structure of the roller hearth type high-temperature electric heating furnace according to any one of claims 1 or 5, characterized in that, The inner surfaces of the first furnace body (311) and the second furnace body (312) are provided with a heat reflective layer with a thickness of not less than 20 mm.

7. The composite furnace lining structure of the roller hearth type high-temperature electric heating furnace according to claim 1, characterized in that, The second furnace body (312) is provided with lifting lugs (319) for hoisting.

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