Improved cover insulation structure for pit carburizing furnace

Abstract

A modified well-type carburizing furnace cover insulation structure includes a furnace cover top plate, a narrow-spacing heat-resistant steel enclosure, vertical and horizontal anchors, a flat layer of fiber blanket, interlayer fiber blankets, fiber modules, and shield fiber modules. The furnace cover top plate has fan mounting holes, and the narrow-spacing heat-resistant steel enclosure and vertical anchors are fixed to its lower side. The flat layer of fiber blanket is laid flat on the lower side of the furnace cover top plate and is fixed by the vertical anchors. Several interlayer fiber blankets are cylindrical in shape with different diameters, spaced apart from each other and fixed to the lower side of the flat layer of fiber blanket. Horizontal anchors are set on the interlayer fiber blanket. Several shield fiber modules and fiber modules are installed from the outside to the inside in several module spaces formed by the narrow-spacing heat-resistant steel enclosure, the flat layer of fiber blanket, and several interlayer fiber blankets, and are respectively fixed by the narrow-spacing heat-resistant steel enclosure, vertical and horizontal anchors. This can prevent carbon black from corroding the furnace cover and reduce heat and atmosphere leakage.

Description

Technical Field

[0001] This utility model relates to the field of pit-type carburizing furnace technology, and in particular to a furnace cover insulation structure for a pit-type carburizing furnace with an improved structure. Background Technology

[0002] Currently, the furnace cover insulation structure of pit-type carburizing furnaces mainly includes two types. The first type consists of a furnace cover top plate, a heat-resistant steel perforated surrounding plate, several anchors, and several fiber modules. The heat-resistant steel perforated surrounding plate is cylindrical and fixed to the lower side of the furnace cover top plate, and the heat-resistant steel perforated surrounding plate and the furnace cover top plate enclose a module setting space. The several anchors are fixedly set on the lower side of the furnace cover top plate within the module setting space. The several fiber modules are fixedly installed within the module setting space by the several anchors. The height of the heat-resistant steel perforated surrounding plate is basically the same as the height of the fiber modules to provide a relatively stable covering and fixing of the fiber modules. The second type is a cover shell made by stamping a whole piece of heat-resistant steel plate into a fully enclosed structure. The perimeter of the cover shell is bent downward to form a lower folded edge. Anchors are arranged inside the cover shell to install and fix fiber cotton or nano-boards, and the lower folded edge covers the edge of the fiber cotton or nano-boards. However, both of the aforementioned furnace cover insulation structures suffer from carbon black corrosion damage in actual use. Specifically, during the operation of a pit-type carburizing furnace, carbon black continuously deposits on the heat-resistant steel perforated shroud or lower flange, as well as on the fiber modules, fiber cotton, or nano-boards that come into contact with the furnace atmosphere. Since the heat-resistant steel perforated shroud or lower flange is made of metal, it gradually becomes corroded by the carbon black, and in some severely corroded areas, it may even detach. Furthermore, under furnace pressure, carbon black and the furnace atmosphere can seep into the furnace cover through the gaps between the fiber modules or between the fiber cotton and nano-boards, further corroding and damaging the top plate or shell of the furnace cover. This affects the insulation and airtightness of the furnace cover insulation structure, leading to leakage and loss of furnace atmosphere and heat. These problems not only directly reduce the service life of the two furnace cover insulation structures but also shorten the overhaul and maintenance cycle of the pit-type carburizing furnace, resulting in high operating and maintenance costs. Furthermore, they also affect the quality and efficiency of workpiece heat treatment. Therefore, how to effectively reduce the corrosion of furnace cover components by carbon black, thereby extending the service life of the furnace cover and the overhaul and maintenance cycle of the pit carburizing furnace, has become one of the technical problems that urgently need to be solved in this field. Utility Model Content

[0003] The technical problem to be solved by this solution is how to reduce the corrosion of the main structural components of the furnace cover by carbon black, so as to extend the service life of the furnace cover and ensure that its insulation structure has good insulation and airtightness over a longer period of time, thereby ensuring the quality and efficiency of workpiece heat treatment and shortening the overhaul and maintenance cycle of the pit carburizing furnace.

[0004] To address the aforementioned technical problems, this technical solution provides a furnace cover insulation structure for a pit-type carburizing furnace with an improved structure. The structure includes: a furnace cover top plate, a narrow-spacing heat-resistant steel shroud, several vertical anchors, a flat layer of fiber blankets, several interlayer fiber blankets, several horizontal anchors, several fiber modules, and several Weidun fiber modules. The furnace cover top plate has at least one fan mounting hole for mounting at least one high-temperature fan. The narrow-spacing heat-resistant steel shroud is cylindrical and its upper edge is fixed to the lower side of the furnace cover top plate. The several vertical anchors are evenly fixed to the lower side of the furnace cover top plate within the area enclosed by the narrow-spacing heat-resistant steel shroud. The flat layer of fiber blankets is laid flat on the lower side of the furnace cover top plate within the area enclosed by the narrow-spacing heat-resistant steel shroud and is fixed by the several vertical anchors, with the anchoring ends of the vertical anchors extending downwards below the flat layer of fiber blankets. The several interlayer fiber blankets are cylindrical in shape with sequentially increasing diameters and are connected to the furnace cover top plate. The centers are arranged around a common circle, spaced apart from each other, and fixed to the lower side of the flat fiber blanket with their respective upper edges. Several module spaces are formed by the narrow-spacing heat-resistant steel cladding, the flat fiber blanket, and the several interlayer fiber blankets. Several horizontal anchors are evenly arranged on the several interlayer fiber blankets, and the anchoring ends of the horizontal anchors extend horizontally outside the interlayer fiber blankets. Several fiber modules are arranged in at least one module space near the center of the furnace cover top plate and are fixed by the anchoring ends of the vertical anchors and the anchoring ends of the horizontal anchors. Several fiber modules are arranged in at least one module space away from the center of the furnace cover top plate and are covered by the lower part of the narrow-spacing heat-resistant steel cladding and fixed by the anchoring ends of the vertical anchors, or covered by the lower part of the narrow-spacing heat-resistant steel cladding and fixed by the anchoring ends of the vertical anchors and fixed by the anchoring ends of the vertical anchors and the anchoring ends of the horizontal anchors. Accordingly, because the narrow-spacing heat-resistant steel cladding has a smaller vertical height, its contact area with the furnace atmosphere is also smaller, thus reducing the amount of carbon black deposited on it and the degree of corrosion. In addition, placing the Weidun fiber modules, which have higher strength and hardness after heating, on the periphery of the furnace cover insulation structure can not only effectively prevent carbon black from penetrating into the insulation structure from the easily intrusive parts of the furnace cover, namely the sides of the furnace cover, but also effectively resist the scouring of the circulating furnace gas. The interlayer fiber blanket and the flat-lay fiber blanket can effectively compensate for the expansion and contraction caused by temperature differences between the fiber modules and the Weidun fiber modules, thereby ensuring that the furnace cover insulation structure has better insulation and airtightness, preventing carbon black from penetrating into the insulation structure through the gaps between the modules and corroding the furnace cover top plate, and reducing the leakage and loss of furnace atmosphere and heat. In addition, the horizontal anchors can also help strengthen the stability of the connection between the interlayer fiber blanket, fiber modules, and Weidun fiber modules.This not only extends the service life of the furnace cover insulation structure and shortens the overhaul and maintenance cycle of the pit-type carburizing furnace, thereby reducing the operation and maintenance costs of the pit-type carburizing furnace, but also ensures the quality and efficiency of workpiece heat treatment processing.

[0005] As another implementation of this technical solution, the lower side of the furnace cover top plate protrudes downward near its edge to form a ring-shaped welding flange. The upper edge of the narrow-spacing heat-resistant steel shroud is fixedly attached to the ring-shaped welding flange. The thickness of the flat-lay fiber blanket is greater than the height of the ring-shaped welding flange but less than the height of the narrow-spacing heat-resistant steel shroud after it is attached to the ring-shaped welding flange. The upper part of the Weidun fiber module, the interlayer fiber blanket, and the fiber module is located within the enclosure of the narrow-spacing heat-resistant steel shroud, while the lower part of the Weidun fiber module, the interlayer fiber blanket, and the fiber module is located below the enclosure of the narrow-spacing heat-resistant steel shroud. Accordingly, the setting of the annular welding flange facilitates the secure bonding of the narrow-spacing heat-resistant steel cladding to the lower side of the furnace cover top plate by welding. Furthermore, due to the smaller vertical height of the narrow-spacing heat-resistant steel cladding and its proximity to the welding and fixing position, its structural strength is better and its deformation under high-temperature conditions is reduced. In addition, by covering the upper part of the Weidun fiber module with the narrow-spacing heat-resistant steel cladding and using vertical and horizontal anchors, the Weidun fiber module, interlayer fiber blanket, and fiber module can be effectively and securely fixed within the enclosure of the narrow-spacing heat-resistant steel cladding.

[0006] As another implementation of this technical solution, the outermost Weidun fiber module has an arc-shaped outer surface that gradually slopes towards the center of the furnace cover from the lower end of the narrow-pitch heat-resistant steel cladding to the lower end of the Weidun fiber module. The Weidun fiber module, the interlayer fiber blanket, and the lower surface of the fiber module combine to form an inclined or arc-shaped surface that gradually slopes upward from the outside towards the center of the furnace cover. Accordingly, the arc-shaped inclined outer surface of the outermost Weidun fiber module facilitates the opening and closing of the furnace cover during the feeding and discharging process of the pit-type carburizing furnace, while the inclined or arc-shaped surface formed by the combination of the Weidun fiber module, the interlayer fiber blanket, and the lower surface of the fiber module facilitates the setting and installation of the heat insulation cover located below the furnace cover insulation structure.

[0007] As another implementation of this technical solution, the furnace cover insulation structure further includes a curing agent layer. This curing agent layer is applied by spraying or brushing to the outer surface of the Weidun fiber module located at the lower end of the narrow-spacing heat-resistant steel cladding, as well as the lower surfaces of the Weidun fiber module, the interlayer fiber blanket, and the fiber module. Accordingly, the curing agent layer can cure and harden the fibers on the outer surface of the Weidun fiber module, as well as the fibers on the lower surfaces of the Weidun fiber module, the interlayer fiber blanket, and the fiber module, reducing the erosion of the surface fibers by the circulating atmosphere inside the furnace, thereby further extending the service life of the furnace cover insulation structure.

[0008] As another implementation of this technical solution, the curing agent layer is composed of condensed aluminum phosphate curing agent, epoxy resin curing agent or silicone resin curing agent.

[0009] As another implementation of this technical solution, when a fan mounting hole is provided on the top plate of the furnace cover, the fan mounting hole is located at the center of the top plate of the furnace cover, and the innermost interlayer fiber blanket covers the outer side of the body of the high-temperature fan installed in the fan mounting hole. Accordingly, not only can the body of the high-temperature fan be insulated and protected, but also the atmosphere and heat inside the furnace can be prevented from leaking to the outside of the furnace cover through the gap between the body and the fiber module.

[0010] As another implementation of this technical solution, when two or more fan mounting holes are opened on the furnace cover top plate, the two or more fan mounting holes are symmetrically opened in the furnace cover top plate area corresponding to the same module setting space, and the outer side of the body of the two or more high-temperature fans installed in the two or more fan mounting holes is covered with a fiber blanket. Accordingly, the fiber blanket can also achieve heat insulation protection for the high-temperature fan body, and prevent the furnace atmosphere and heat from leaking to the outside of the furnace cover through the gap between the body and the fiber module.

[0011] As another implementation of this technical solution, the Weidun fiber module is made of ceramic fiber.

[0012] As another implementation of this technical solution, the fiber module is made of high-purity aluminum silicate fiber.

[0013] As another implementation of this technical solution, both the flat layer fiber blanket and the interlayer fiber blanket are made of ceramic fibers. Attached Figure Description

[0014] Figure 1 This is a schematic cross-sectional view of the furnace cover insulation structure of the improved pit-type carburizing furnace of this utility model. Figure 2 This is a partial cross-sectional schematic diagram of the furnace cover insulation structure of the improved pit-type carburizing furnace of this utility model. Figure 3 A bottom view of the insulation structure for mounting a high-temperature fan; Figure 4 A bottom view of the insulation structure for the cover housing three high-temperature fans.

[0015] Explanation of symbols in the attached diagram: 1 Furnace cover top plate; 11 Fan mounting hole; 12 Annular welding flange; 2 Narrow-pitch heat-resistant steel cladding; 31 Vertical anchor; 32 Horizontal anchor; 4 Flat fiber blanket; 5 Interlayer fiber blanket; 6 Fiber module; 7 Weidun fiber module; 8 Curing agent layer; 9 Fiber blanket; A High-temperature fan. Detailed Implementation

[0016] The detailed description and technical content of this utility model are explained below with reference to the accompanying drawings. However, the accompanying drawings are provided for reference and illustration only and are not intended to limit this utility model.

[0017] In the context of this specification, any two or more embodiments of this utility model can be arbitrarily combined, and the resulting technical solutions are part of the original disclosure of this specification and also fall within the protection scope of this utility model.

[0018] like Figure 1 and Figure 2 The figures shown are an overall cross-sectional view and a partial cross-sectional view of a specific embodiment of the furnace cover insulation structure of the improved pit-type carburizing furnace of this utility model. Figure 1 The diagram shows the furnace cover insulation structure (hereinafter referred to as the furnace cover insulation structure) of the improved well-type carburizing furnace of this utility model, which is equipped with two or more high-temperature fans A. This furnace cover insulation structure is suitable for installing one high-temperature fan A, two high-temperature fans A, or more high-temperature fans A, but this utility model does not limit it in this regard.

[0019] Combination Figure 2 As shown, the furnace cover insulation structure of this utility model includes a furnace cover top plate 1, a narrow-spacing heat-resistant steel shroud 2, several vertical anchors 31, a flat layer of fiber blanket 4, several interlayer fiber blankets 5, several horizontal anchors 32, several fiber modules 6, and several Weidun fiber modules 7. The furnace cover top plate 1 has at least one fan mounting hole 11 (to accommodate...). Figure 1 and Figure 4 The image shows three fan mounting holes 11. Figure 1(Due to the cross-sectional angle, the other fan mounting hole 11 cannot be shown) for mounting at least one high-temperature fan A. The narrow-pitch heat-resistant steel shroud 2 is cylindrical and its upper end edge is fixedly attached to the lower side of the furnace cover top plate 1. Several vertical anchors 31 are evenly fixedly attached to the lower side of the furnace cover top plate 1 within the area enclosed by the narrow-pitch heat-resistant steel shroud 2. The flat fiber blanket 4 is laid flat on the lower side of the furnace cover top plate 1 within the area enclosed by the narrow-pitch heat-resistant steel shroud 2 and is fixed by the several vertical anchors 31. Furthermore, the anchoring end of the vertical anchor 31 extends downwards to the bottom of the flat fiber blanket 4. The several interlayer fiber blankets 5 are cylindrical in shape with their diameters increasing sequentially, and are spaced apart from each other with the center of the furnace cover top plate 1 as the common center. They are fixed to the lower side of the flat fiber blanket 4 by their respective upper end edges. Several modular installation spaces are formed by the narrow-spacing heat-resistant steel cladding 2, the flat fiber blanket 4, and the several interlayer fiber blankets 5. The several horizontal anchors 32 are evenly arranged in these modules. The anchoring ends of the horizontal anchors 32 on the interlayer fiber blanket 5 extend horizontally beyond the interlayer fiber blanket 5. Several fiber modules 6 are disposed in at least one module space near the center of the furnace cover top plate 1 and are fixed by the anchoring ends of the vertical anchors 31 and the horizontal anchors 32. Several shield fiber modules 7 are disposed in at least one module space away from the center of the furnace cover top plate 1. When the several shield fiber modules 7 are only disposed in the outermost module space... The Weidun fiber module 7 is covered by the lower part of the narrow-spacing heat-resistant steel enclosure 2 and fixed by the anchoring end of the vertical anchor 31. When the Weidun fiber modules 7 are arranged in the outermost and second outermost module arrangement spaces, the outermost Weidun fiber module 7 is covered by the lower part of the narrow-spacing heat-resistant steel enclosure 2 and fixed by the anchoring end of the vertical anchor 31, while the second outermost Weidun fiber module 7 is fixed by the anchoring ends of both the vertical anchor 31 and the horizontal anchor 32. Figure 3 and Figure 4As shown, the module can be arranged in a circular shape, and the Weidun fiber module 7 and the surrounding fiber modules 6 can be arc-shaped blocks. When two or more high-temperature fans A are installed, the middle fiber module 6 can be a circular block. Furthermore, the flat fiber blanket 4 and the interlayer fiber blanket 5 in this invention are both made of ceramic fibers, the fiber module 6 is made of high-purity aluminosilicate fibers, and the Weidun fiber module 7 is made of ceramic fibers. At room temperature, there is no difference between the Weidun fiber module 7 and the fiber module 6. However, the Weidun fiber module 7 hardens after being exposed to high temperatures, and its fiber density, strength, and hardness are much higher than those of the fiber module 6, effectively preventing carbon black from corroding and eroding the interior of the furnace cover insulation structure. The vertical anchor 31 in this utility model can be an anchor such as a claw nail commonly used in kilns and other equipment. It generally has a forked structure at the anchoring end. The horizontal anchor 32 can be an anchor with a U-shaped needle structure. It has a bent structure at the anchoring end. By using the anchor with the above structure, the fiber blanket and fiber module can be stably fixed inside the furnace cover.

[0020] Furthermore, the lower side of the furnace cover top plate 1 protrudes downward near its edge to form a ring-shaped welding flange 12. The upper edge of the narrow-spacing heat-resistant steel shroud 2 can be fixedly joined to the ring-shaped welding flange 12 by welding. The thickness of the flat fiber blanket 4 is greater than the height of the ring-shaped welding flange 12 and less than the height of the narrow-spacing heat-resistant steel shroud 2 after being joined with the ring-shaped welding flange 12. The upper parts of the Weidun fiber module 7, the interlayer fiber blanket 5 and the fiber module 6 are all located within the enclosure of the narrow-spacing heat-resistant steel shroud 2, while the lower parts of the Weidun fiber module 7, the interlayer fiber blanket 5 and the fiber module 6 are located below the enclosure of the narrow-spacing heat-resistant steel shroud 2. The annular welding flange 12 facilitates the secure welding of the narrow-spacing heat-resistant steel cladding plate 2 to the lower side of the furnace cover top plate 1. Furthermore, the narrow-spacing heat-resistant steel cladding plate 2 has a relatively small vertical height, typically only about 130mm, resulting in a smaller contact area with the furnace atmosphere, reducing carbon black deposition. It also allows for closer proximity to the welding and fixing position, leading to better structural strength and reduced deformation under high-temperature conditions. Additionally, by covering the upper part of the Weidun fiber module 7 with the narrow-spacing heat-resistant steel cladding plate 2 and using vertical and horizontal anchors 31 and 32, the Weidun fiber module 7, interlayer fiber blanket 5, and fiber module 6 can be effectively and securely fixed within the enclosure of the narrow-spacing heat-resistant steel cladding plate 2.

[0021] Furthermore, the outermost Weidun fiber module 7 has an arc-shaped outer surface that gradually slopes towards the center of the furnace cover top plate 1 from the lower end of the narrow-spacing heat-resistant steel cladding plate 2 to the lower end of Weidun fiber module 7. The lower surfaces of Weidun fiber module 7, interlayer fiber blanket 5, and fiber module 6 combine to form an inclined or arc-shaped surface that gradually slopes upward from the outside towards the center of the furnace cover top plate 1. Accordingly, the arc-shaped inclined outer surface of the outermost Weidun fiber module 7 allows the lower part of the furnace cover insulation structure to form a downwardly tapering frustum shape, which facilitates the opening and closing of the furnace cover during the feeding and discharging process of the pit-type carburizing furnace. The inclined or arc-shaped surface formed by the combination of the lower surfaces of Weidun fiber module 7, interlayer fiber blanket 5, and fiber module 6 facilitates the setting and installation of the heat insulation cover (not shown in the figure) located below the furnace cover insulation structure.

[0022] Furthermore, the furnace cover insulation structure may also include a curing agent layer 8, which can be applied by spraying or brushing to the outer surface of the Weidun fiber module 7 located at the lower end of the narrow-spacing heat-resistant steel enclosure 2, as well as the lower surfaces of the Weidun fiber module 7, the interlayer fiber blanket 5, and the fiber module 6. This curing agent layer 8 is composed of condensed aluminum phosphate curing agent, epoxy resin curing agent, or silicone resin curing agent. The curing agent layer 8 can cure and harden the fibers on the outer surface of the Weidun fiber module 7, as well as the lower surfaces of the Weidun fiber module 7, the interlayer fiber blanket 5, and the fiber module 6, reducing the erosion of the surface fibers by the circulating atmosphere inside the furnace, thereby further extending the service life of the furnace cover insulation structure.

[0023] In this embodiment, when a fan mounting hole 11 is provided on the furnace cover top plate 1, combined with Figure 3 As shown, the fan mounting hole 11 is located at the center of the furnace cover top plate 1. The innermost interlayer fiber blanket 5 covers the outer side of the body of the high-temperature fan A installed in the fan mounting hole 11. This not only provides heat insulation protection for the body of the high-temperature fan A, but also prevents the furnace atmosphere and heat from leaking to the outside of the furnace cover through the gap between the body and the fiber module.

[0024] In this embodiment, when two or more fan mounting holes 11 are opened on the furnace cover top plate 1, combined with Figure 4 As shown, taking the example of having three fan mounting holes 11, the three fan mounting holes 11 are symmetrically opened in the furnace cover top plate 1 area corresponding to the same module setting space, and the outer side of the body of the three high-temperature fans A installed in the three fan mounting holes 11 is covered with fiber blanket 9. The material of the fiber blanket 9 is the same as that of the interlayer fiber blanket 5. The setting of the fiber blanket 9 can also achieve heat insulation protection for the body of the high-temperature fan A, and prevent the atmosphere and heat inside the furnace from leaking to the outside of the furnace cover through the gap between the body and the fiber module.

[0025] In summary, the furnace cover insulation structure of this utility model utilizes narrow-spacing heat-resistant steel plates with a relatively small vertical height, resulting in a smaller contact area between the steel plates and the furnace atmosphere. This reduces the amount of carbon black deposited on the plates and the degree of corrosion. Furthermore, the use of Weidun fiber modules surrounding the furnace cover insulation structure, after being heated and calcined in the furnace, hardens, densifies, and increases in strength. This not only effectively prevents carbon black from penetrating into the insulation structure from the sides of the furnace cover (where it is most susceptible to intrusion), but also effectively resists the furnace atmosphere. The internal circulation furnace gas washes away the heat; the interlayer fiber blankets and flat-layer fiber blankets effectively compensate for the expansion and contraction caused by temperature differences between the fiber modules and the Weidun fiber modules, thus ensuring that the furnace cover insulation structure has better insulation and airtightness. This prevents carbon black from penetrating the insulation structure through the gaps between the modules and corroding the furnace cover top plate, and also reduces the leakage and loss of atmosphere and heat inside the furnace. In addition, the horizontal anchors further strengthen the stability of the connection between the interlayer fiber blankets, fiber modules, and Weidun fiber modules. This not only extends the service life of the furnace cover insulation structure and shortens the overhaul and maintenance cycle of the pit carburizing furnace, thereby reducing the operation and maintenance costs of the pit carburizing furnace, but also ensures the quality and efficiency of workpiece heat treatment.

[0026] The above are merely preferred embodiments of the present utility model and are not intended to limit the patent scope of the present utility model. Other equivalent changes made using the patent concept of the present utility model should all fall within the patent protection scope of the present utility model.

Claims

1. A furnace cover insulation structure for a pit-type carburizing furnace with an improved structure, comprising: The furnace cover top plate has at least one fan mounting hole for mounting at least one high-temperature fan. The furnace cover insulation structure further includes: a narrow-spacing heat-resistant steel shroud, several vertical anchors, a flat layer of fiber blanket, several interlayer fiber blankets, several horizontal anchors, several fiber modules, and several Weidun fiber modules. The narrow-spacing heat-resistant steel shroud is cylindrical and its upper edge is fixedly attached to the lower side of the furnace cover top plate. The several vertical anchors are evenly spaced... The fixed connection is to the lower side of the furnace cover top plate within the area enclosed by the narrow-spacing heat-resistant steel cladding. The flat fiber blanket is laid flat on the lower side of the furnace cover top plate within the area enclosed by the narrow-spacing heat-resistant steel cladding and is fixed by the plurality of vertical anchors. The anchoring ends of the vertical anchors extend downwards to below the flat fiber blanket. The plurality of interlayer fiber blankets are cylindrical in shape with increasing diameters, and are spaced apart from each other with the center of the furnace cover top plate as the common center. Each of its upper end edges is fixedly attached to the lower side of the flat layer fiber blanket, and several module setting spaces are formed by the narrow-pitch heat-resistant steel cladding, the flat layer fiber blanket, and the several interlayer fiber blankets. Several horizontal anchors are evenly arranged on the several interlayer fiber blankets, and the anchoring ends of the horizontal anchors extend horizontally outside the interlayer fiber blankets. Several fiber modules are set in at least one of the module setting spaces near the center of the furnace cover top plate and are fixed by the anchoring ends of the vertical anchors and the anchoring ends of the horizontal anchors. Several Weidun fiber modules are set in at least one of the module setting spaces away from the center of the furnace cover top plate and are fixed by the lower part of the narrow-pitch heat-resistant steel cladding and the anchoring ends of the vertical anchors, or by the lower part of the narrow-pitch heat-resistant steel cladding and the anchoring ends of the vertical anchors, and by the anchoring ends of the vertical anchors and the anchoring ends of the horizontal anchors.

2. The furnace cover insulation structure according to claim 1, characterized in that, The lower side of the furnace cover top plate protrudes downward near its edge to form a ring-shaped welding flange. The upper edge of the narrow-pitch heat-resistant steel shroud is fixedly attached to the ring-shaped welding flange. The thickness of the flat fiber blanket is greater than the height of the ring-shaped welding flange but less than the height of the narrow-pitch heat-resistant steel shroud after it is attached to the ring-shaped welding flange. The upper part of the Weidun fiber module, the interlayer fiber blanket, and the fiber module is located within the enclosure of the narrow-pitch heat-resistant steel shroud. The lower part of the Weidun fiber module, the interlayer fiber blanket, and the fiber module is located below the enclosure of the narrow-pitch heat-resistant steel shroud.

3. The furnace cover insulation structure according to claim 2, characterized in that, The outermost side of the Weidun fiber module is arc-shaped in the horizontal direction and gradually slopes towards the center of the furnace cover top plate from the lower end of the narrow-pitch heat-resistant steel cladding to the lower end of the Weidun fiber module. The Weidun fiber module, the interlayer fiber blanket and the lower side of the fiber module together form an inclined surface or arc-shaped surface that gradually slopes upward from the outside to the area near the center of the furnace cover top plate.

4. The furnace cover insulation structure according to claim 3, characterized in that, Also includes: A curing agent layer is applied by spraying or brushing to the outer surface of the Weidun fiber module located at the lower end of the narrow-pitch heat-resistant steel enclosure, as well as the lower surface of the Weidun fiber module, the interlayer fiber blanket, and the fiber module.

5. The furnace cover insulation structure according to claim 4, characterized in that, The curing agent layer is composed of condensed aluminum phosphate curing agent, epoxy resin curing agent or organosilicon resin curing agent.

6. The furnace cover insulation structure according to claim 1, characterized in that, When a fan mounting hole is provided on the top plate of the furnace cover, the fan mounting hole is located at the center of the top plate of the furnace cover, and the innermost interlayer fiber blanket covers the outer side of the body of the high-temperature fan installed in the fan mounting hole.

7. The furnace cover insulation structure according to claim 1, characterized in that, When two or more fan mounting holes are opened on the furnace cover top plate, the two or more fan mounting holes are symmetrically opened in the furnace cover top plate area corresponding to the same module setting space, and the outer side of the body of the two or more high temperature fans installed in the two or more fan mounting holes is covered with fiber blanket.

8. The furnace cover insulation structure according to claim 1, characterized in that, The Weidun fiber module is made of ceramic fiber.

9. The furnace cover insulation structure according to claim 1, characterized in that, The fiber module is made of high-purity aluminum silicate fiber.

10. The furnace cover insulation structure according to claim 1, characterized in that, Both the flat-layer fiber blanket and the interlayer fiber blanket are made of ceramic fibers.

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