Composite thermal insulation layer structure for mesh belt furnace
By adopting a composite insulation layer structure in the mesh belt furnace, combining refractory bricks, aluminosilicate cotton blankets, and rigid fiberboard, the problems of support, insulation, and economy of existing mesh belt furnaces have been solved, achieving efficient, lightweight, and reliable insulation effects.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO EAST HEATING EQUIP CO LTD
- Filing Date
- 2025-05-22
- Publication Date
- 2026-04-28
AI Technical Summary
Existing powder metallurgy mesh belt furnaces with all-cotton and all-brick structures have shortcomings in terms of support, insulation, economy, and service life. They also suffer from problems such as insufficient heating rod strength, carbon layer accumulation, poor insulation performance, high maintenance difficulty, and excessive weight.
A composite insulation layer structure is adopted, which includes a combination of refractory brick layer, aluminum silicate cotton blanket layer and rigid fiberboard layer. The materials and thickness are reasonably arranged according to the temperature range requirements. Combined with the selection of refractory bricks and the fixing method of heating rod, the heat distribution and support are optimized.
It improves thermal efficiency, enhances structural support and insulation, reduces weight, extends service life, reduces maintenance costs, and meets the needs of different processes.
Smart Images
Figure CN224175611U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of mesh belt furnaces, and in particular to a composite insulation layer structure for mesh belt furnaces. Background Technology
[0002] Most existing powder metallurgy mesh belt furnaces adopt an all-cotton or all-brick structure. The bottom of the furnace chamber is made of standard refractory bricks (temperature resistant up to 1700 degrees Celsius), which are mainly responsible for insulation and load-bearing; the insulation materials on both sides are aluminosilicate cotton blankets or insulating bricks.
[0003] The existing all-cotton structure has the following disadvantages: 1. The structure is relatively loose. With the ever-increasing demand for production, general mesh belt furnaces can no longer meet the requirements. Therefore, the pursuit of increasing the width of the mesh belt has created a problem. The heating rods of the mesh belt furnace are arranged vertically. Since the all-cotton structure cannot provide internal support, the span of the support points will be large. Increasing the width will place higher demands on the strength of the heating rods, but the support components will sag under the influence of gravity at high temperatures. Excessive width will lead to stress concentration and breakage. 2. The porous structure of the aluminosilicate cotton blanket will cause free carbon volatilized during sintering to deposit on the surface of the cotton blanket. Over time, a thick carbon layer will form. Since carbon itself is conductive, the contact between the heating rods and the carbon layer will cause local short circuits. 3. The cotton blanket will pulverize after long-term use, increasing the difficulty of maintenance, weakening the heat preservation effect, and increasing the power consumption of the furnace.
[0004] Existing all-brick structures have the following disadvantages: 1. Insulation performance is inferior to all-cotton structures. The thermal conductivity of insulating bricks is ten times that of aluminum silicate cotton, so to achieve the same insulation effect, the thickness of an all-brick structure needs to be much greater than that of an all-cotton structure. 2. Difficult to process. All-brick structures require wall curing, increasing the difficulty of major repairs and replacements compared to all-cotton structures. 3. Heavier. The weight of an all-brick structure is generally 2-3 times that of an all-cotton structure furnace. 4. Higher cost, requiring professional bricklayers. Utility Model Content
[0005] (a) Technical problems to be solved
[0006] The technical problem to be solved by this utility model is to provide a composite insulation layer structure for mesh belt furnaces. By adopting the composite insulation layer structure, the material and thickness of the insulation layer can be reasonably arranged to meet the different needs of different temperature ranges. This can ensure support, insulation, economy and service life, while achieving overall lightweight, simplicity and reliability.
[0007] (II) Technical Solution
[0008] The solution adopted by this utility model to solve the above-mentioned technical problems is a composite insulation layer structure for a mesh belt furnace. The mesh belt furnace includes a furnace body with a tunnel-type furnace chamber and a conveyor mesh belt that can pass through the furnace chamber. A first insulation structure is provided above the furnace chamber in the furnace body, a second insulation structure is provided below the furnace chamber, and a third insulation structure is provided on both sides of the furnace chamber.
[0009] The first insulation structure includes insulation cotton;
[0010] The second insulation structure includes a refractory brick base;
[0011] The third insulation structure comprises three layers arranged sequentially from the inside out; wherein, the first layer is a refractory brick layer; the second layer is a high-purity aluminum silicate cotton blanket layer; and the third layer is a rigid fiberboard layer.
[0012] By adopting the above scheme, the furnace is insulated in all directions through the setting of the first, second and third insulation structures, which significantly improves thermal efficiency. At the same time, the side of the furnace adopts a composite insulation layer structure, which can reasonably arrange the material and thickness of the insulation layer according to the different needs of different temperature ranges. This can ensure support, insulation, economy and service life, while achieving overall lightweight, simplicity and reliability.
[0013] In some embodiments, the thickness of the refractory brick layer is 113 mm.
[0014] Using the above solution, this thickness can provide sufficient heat insulation and support, while avoiding an increase in furnace weight due to excessive thickness.
[0015] In some embodiments, the refractory bricks selected for the refractory brick layer are chosen according to the operating temperature of the mesh belt furnace;
[0016] When the operating temperature of the mesh belt furnace is below 1150℃, the refractory brick layer uses T23 mullite bricks, which have a temperature resistance rating of 1350℃ and a thermal conductivity of 0.22W / m·K.
[0017] When the mesh belt furnace is a high-temperature sintering furnace, the refractory brick layer uses T28 mullite bricks, which have a temperature resistance rating of 1540℃ and a thermal conductivity of 0.32W / m·K.
[0018] By adopting the above scheme, the type of refractory brick is selected according to the operating temperature of the mesh belt furnace to ensure the best applicability and economy of the material; T23 mullite bricks and T28 mullite bricks are suitable for conventional and high-temperature sintering furnaces respectively, to meet different process requirements; the high temperature resistance and low thermal conductivity of the refractory bricks effectively improve the thermal insulation performance.
[0019] In some embodiments, when the mesh belt furnace is used to process products containing a large amount of zinc oxide, the refractory brick base is selected from heavy refractory bricks.
[0020] Using the above scheme, when processing products containing a large amount of zinc oxide, heavy refractory bricks as a base can resist corrosion and erosion by volatiles, thus extending the furnace life; moreover, the strength and stability of heavy refractory bricks are superior to ordinary refractory bricks, further enhancing the supporting capacity of the furnace body.
[0021] In some embodiments, the high-purity aluminum silicate cotton blanket layer is made of high-purity aluminum silicate cotton blanket, which has a temperature resistance rating of 1260℃ and a thermal conductivity of 0.035-0.045W / (m·K), making it an excellent thermal insulation material.
[0022] Specifically, since the innermost layer is already protected by refractory bricks, the actual temperature of the high-purity aluminosilicate cotton blanket area is already below 1000 degrees Celsius. This greatly reduces the pulverization rate of the high-purity aluminosilicate cotton blanket and also isolates the formation of the carbon layer.
[0023] By adopting the above scheme, the low thermal conductivity of the high-purity aluminum silicate cotton blanket significantly reduces heat loss and improves the thermal efficiency of the furnace.
[0024] In some embodiments, the high-purity aluminum silicate cotton blanket is made by manually stacking.
[0025] Specifically, the manual stacking method allows for flexible adjustment of the thickness and density of the cotton blankets according to actual needs, adapting to the insulation requirements of different furnaces; the manufacturing process is simple and the cost is low, making it suitable for small-batch or customized production.
[0026] In some embodiments, the high-purity aluminum silicate cotton blanket is made by pre-compression.
[0027] Specifically, the pre-compression method increases the density of the cotton blanket, enhancing its insulation effect; the pre-compressed cotton blanket is easier to install and fix, reducing construction difficulty.
[0028] In some embodiments, the hardboard layer is selected from rotary block hardboard.
[0029] Using the above solution, the rotating block hard fiberboard has high strength and fit, and can be tightly bonded to the furnace body iron plate to reduce heat loss; its lightweight design reduces the weight of the overall structure, making it easy to transport and install; at the same time, the hard fiberboard is not easy to pulverize, has a long service life, and reduces maintenance costs.
[0030] In some embodiments, an upper heating rod and a lower heating rod are respectively provided on the upper and lower sides of the furnace body; the insulation cotton is provided above the upper heating rod, and the refractory brick base is provided below the lower heating rod.
[0031] By adopting the above scheme, the arrangement of the upper and lower heating rods achieves uniform heating of the furnace and improves heating efficiency; the insulation cotton and refractory brick base are located above and below the heating rods, respectively, further optimizing the distribution and utilization of heat.
[0032] In some embodiments, the two ends of the upper heating rod and the lower heating rod are fixed to the third insulation structure.
[0033] Specifically, using refractory bricks as the innermost layer of the structure ensures effective heat insulation and support, reduces the amount of bending of the upper and lower heating rods during heating, prevents the powdering and collapse of the all-cotton structure, and avoids carbon layer accumulation.
[0034] With the above solution, the two ends of the upper and lower heating rods are fixed to the third layer of insulation structure, which enhances the stability of the heating rods; the fixing method is simple and reliable, reducing the deformation or damage of the heating rods caused by thermal expansion.
[0035] In some embodiments, a mesh belt return device is provided below the furnace body. The mesh belt return device is arranged along the mesh belt conveying direction within the furnace chamber and includes a plurality of rollers spaced apart along the mesh belt conveying direction. The rollers are capable of rotating about an axis perpendicular to the mesh belt conveying direction to convey the mesh belt. A fixed base is provided below the furnace body, and the two ends of the rollers along their length are fixed to the fixed base by fixed angle steel. The rollers are fixed to the fixed angle steel by fixed screws, and a bearing is provided between the rollers and the fixed screws to enable the rotational movement of the rollers.
[0036] The above solution uses rotatable rollers to convey the heated mesh belt. The two are in a rolling friction mode with low friction, which significantly reduces friction, reduces wear, extends the life of the mesh belt, and lowers operating costs. At the same time, it improves the conveying efficiency of the mesh belt. The rollers are arranged at intervals and have an overall rolling structure, which avoids the problem of the mesh belt getting caught due to the edge turning or deformation of the traditional mesh belt trough, reducing operational failures. Furthermore, through the combined design of fixed base, fixed angle steel and bearings, the installation of the rollers is more stable and the rotation is smoother, reducing vibration and noise during operation, while also facilitating disassembly and maintenance.
[0037] (III) Beneficial Effects
[0038] Compared with the prior art, this utility model designs a composite insulation layer structure for mesh belt furnaces.
[0039] (1) This utility model achieves all-round insulation of the furnace by setting up the first insulation structure, the second insulation structure and the third insulation structure, which significantly improves the thermal efficiency. At the same time, the side of the furnace adopts a composite insulation layer structure, which can reasonably arrange the material and thickness of the insulation layer according to the different needs of different temperature ranges. It can not only ensure the support, insulation, economy and service life, but also achieve overall lightweight, simple and reliable.
[0040] (2) The thickness of the refractory brick layer of this utility model is 113mm. This thickness can provide sufficient heat insulation performance and support, while avoiding the increase in furnace weight due to excessive thickness.
[0041] (3) This utility model can select the type of refractory brick according to the operating temperature of the mesh belt furnace to ensure the best applicability and economy of the material; T23 mullite brick and T28 mullite brick are respectively suitable for conventional and high temperature sintering furnaces to meet different process requirements; the high temperature resistance and low thermal conductivity of the refractory brick effectively improve the heat preservation performance.
[0042] (4) When processing products containing a large amount of zinc oxide, the heavy refractory bricks as the base can resist corrosion and erosion by volatiles, thus extending the life of the furnace body; moreover, the strength and stability of the heavy refractory bricks are better than those of ordinary refractory bricks, further enhancing the supporting capacity of the furnace body.
[0043] (5) The rotating block hard fiberboard of this utility model has high strength and fit, and can be tightly bonded to the furnace body iron plate to reduce heat loss; its lightweight design reduces the weight of the overall structure, making it easy to transport and install; at the same time, the hard fiberboard is not easy to pulverize, has a long service life, and reduces maintenance costs.
[0044] (6) The arrangement of the upper heating rod and the lower heating rod in this utility model realizes uniform heating of the furnace and improves heating efficiency; the insulation cotton and the refractory brick base are located above and below the heating rod, respectively, which further optimizes the distribution and utilization of heat.
[0045] (7) The upper and lower heating rods of this utility model are fixed at both ends on the third layer of insulation structure, which enhances the stability of the heating rods; the fixing method is simple and reliable, reducing the deformation or damage of the heating rods caused by thermal expansion. Attached Figure Description
[0046] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in 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.
[0047] Figure 1This is a schematic diagram of a composite insulation layer structure for a mesh belt furnace according to the present invention.
[0048] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.
[0049] The component names corresponding to the various labels in the figure are: 100, furnace body; 200, furnace chamber; 300, insulation cotton; 400, refractory brick base; 500, refractory brick layer; 600, high-purity aluminosilicate cotton blanket layer; 700, hard fiberboard layer; 800, upper heating rod; 900, lower heating rod. Detailed Implementation
[0050] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but should not be used to limit the scope of this utility model.
[0051] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0052] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0053] It should be noted that the following description covers various aspects of embodiments within the scope of the appended claims. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.
[0054] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.
[0055] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.
[0056] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.
[0057] like Figure 1As shown, this utility model provides a composite insulation layer structure for a mesh belt furnace. The mesh belt furnace includes a furnace body with a tunnel-type furnace chamber 200 and a conveyor mesh belt that can pass through the furnace chamber 200. A first insulation structure is provided above the furnace chamber 200 in the furnace body, a second insulation structure is provided below the furnace chamber 200, and a third insulation structure is provided on both sides of the furnace chamber 200. The first insulation structure is insulation cotton 300; the second insulation structure is a refractory brick base 400; the third insulation structure includes three layers arranged sequentially from the inside to the outside. The first layer is a refractory brick layer 500; the second layer is a high-purity aluminosilicate cotton blanket layer 600; and the third layer is a rigid fiberboard layer 700. By adopting the above-mentioned scheme, the furnace 200 is insulated in all directions through the design of the first, second, and third insulation structures, significantly improving thermal efficiency. Simultaneously, the sides of the furnace 200 employ a composite insulation layer structure, allowing for the rational arrangement of the insulation layer material and thickness to meet the different needs of different temperature ranges. This ensures support, insulation, economy, and service life, while also achieving overall lightweighting, simplicity, and reliability. In some embodiments, the refractory brick layer 500 has a thickness of 113mm. This thickness provides sufficient insulation and support while avoiding an increase in furnace weight due to excessive thickness.
[0058] In some embodiments, the refractory bricks selected for the refractory brick layer 500 are chosen based on the operating temperature of the mesh belt furnace. When the operating temperature of the mesh belt furnace is below 1150℃, the refractory brick layer 500 uses T23 mullite bricks, which have a temperature resistance rating of 1350℃ and a thermal conductivity of 0.22 W / m·K. When the mesh belt furnace is a high-temperature sintering furnace, the refractory brick layer 500 uses T28 mullite bricks, which have a temperature resistance rating of 1540℃ and a thermal conductivity of 0.32 W / m·K. By adopting the above scheme, the type of refractory brick is selected according to the operating temperature of the mesh belt furnace, ensuring optimal material applicability and economy. T23 mullite bricks and T28 mullite bricks are suitable for conventional and high-temperature sintering furnaces, respectively, meeting different process requirements. The high temperature resistance rating and low thermal conductivity of the refractory bricks effectively improve the heat preservation performance. In some embodiments, when the mesh belt furnace is used to process products containing a large amount of zinc oxide, the refractory brick base 400 uses heavy refractory bricks. Using the above scheme, when processing products containing a large amount of zinc oxide, heavy refractory bricks as a base can resist corrosion and erosion by volatiles, extending the furnace life; moreover, the strength and stability of heavy refractory bricks are superior to ordinary refractory bricks, further enhancing the supporting capacity of the furnace. In some embodiments, the high-purity aluminosilicate cotton blanket layer 600 is made of high-purity aluminosilicate cotton blanket, with a temperature resistance rating of 1260℃ and a thermal conductivity of 0.035-0.045W / (m·K), making it an excellent insulation material. Specifically, since the innermost layer is already separated by refractory bricks, the actual temperature of the high-purity aluminosilicate cotton blanket area is already below 10010 degrees Celsius, thus greatly reducing the pulverization rate of the high-purity aluminosilicate cotton blanket and preventing the formation of a carbon layer. Using the above scheme, the low thermal conductivity of the high-purity aluminosilicate cotton blanket significantly reduces heat loss and improves the thermal efficiency of the furnace. In some embodiments, the high-purity aluminosilicate cotton blanket is manufactured by manual stacking. Specifically, the manual stacking method allows for flexible adjustment of the cotton blanket's thickness and density according to actual needs, adapting to the insulation requirements of different furnaces; the manufacturing process is simple, low-cost, and suitable for small-batch or customized production. In some embodiments, the high-purity aluminum silicate cotton blanket is manufactured using a pre-compression method. Specifically, pre-compression increases the density of the cotton blanket, enhancing its insulation effect; pre-compressed cotton blankets are easier to install and fix, reducing construction difficulty.
[0059] In some embodiments, the rigid fiberboard layer 700 is selected from rotary block rigid fiberboard. Using the above-described solution, the rotary block rigid fiberboard has high strength and adhesion, enabling it to fit tightly against the furnace body iron plate and reduce heat loss; its lightweight design reduces the overall structural weight, facilitating transportation and installation; simultaneously, the rigid fiberboard is not prone to pulverization, has a long service life, and reduces maintenance costs.
[0060] In some embodiments, an upper heating rod 800 and a lower heating rod 900 are respectively arranged on the upper and lower sides of the furnace chamber 200; the insulation cotton 300 is disposed above the upper heating rod 800, and the refractory brick base 400 is disposed below the lower heating rod 900. Using the above scheme, the arrangement of the upper heating rod 800 and the lower heating rod 900 achieves uniform heating of the furnace chamber 200, improving heating efficiency; the insulation cotton 300 and the refractory brick base 400 are respectively located above and below the heating rods, further optimizing heat distribution and utilization. In some embodiments, the two ends of the upper heating rod 800 and the lower heating rod 900 are fixed to the third layer of insulation structure. Specifically, using refractory brick as the innermost layer structure ensures effective heat insulation and support, reduces the bending amount of the upper heating rod 800 and the lower heating rod 900 during heating, and also prevents the powdering and collapse phenomenon of the all-cotton structure, avoiding carbon layer accumulation. With the above solution, the two ends of the upper heating rod 800 and the lower heating rod 900 are fixed to the third layer of insulation structure, which enhances the stability of the heating rods; the fixing method is simple and reliable, reducing the deformation or damage of the heating rods caused by thermal expansion.
[0061] like Figure 2 As shown, in some embodiments, a mesh belt return device is provided below the furnace body 100. The mesh belt return device is arranged along the mesh belt conveying direction within the furnace chamber, and includes a plurality of rollers 101 spaced apart along the mesh belt conveying direction. The rollers 101 are capable of rotating around an axis perpendicular to the mesh belt conveying direction to convey the mesh belt. A fixed base 102 is provided below the furnace body 100, and the two ends of the rollers 101 along their length are fixed to the fixed base 102 by fixed angle steel 103. The rollers 101 are fixed to the fixed angle steel 103 by fixed screws 104, and a bearing 105 is provided between the rollers 101 and the fixed screws 104 to realize the rotational movement of the rollers 101. The above solution uses rotatable rollers 101 to convey the heated mesh belt. The two are in a rolling friction form with low friction, which significantly reduces friction, reduces wear, extends the life of the mesh belt, and lowers the operating cost. At the same time, it improves the conveying efficiency of the mesh belt. The rollers 101 are arranged at intervals and have an overall rolling structure, which avoids the problem of the mesh belt getting caught due to the flange or deformation of the traditional mesh belt groove, reducing operational failures. Furthermore, through the combined design of the fixed seat 102, the fixed angle steel 103 and the bearing 105, the installation of the rollers 101 is more stable and the rotation is smoother, reducing vibration and noise during operation, while also facilitating disassembly and maintenance.
[0062] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.
[0063] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A composite insulation layer structure for a mesh belt furnace, the mesh belt furnace comprising a furnace body having a tunnel-type furnace chamber (200) and a conveyor mesh belt capable of passing through the furnace chamber (200); characterized in that: The furnace body is provided with a first heat preservation structure above the furnace chamber (200), a second heat preservation structure below the furnace chamber (200), and a third heat preservation structure on both sides of the furnace chamber (200). The first insulation structure includes insulation cotton (300); The second insulation structure includes a refractory brick base (400); The third insulation structure comprises three layers arranged sequentially from the inside out; wherein, the first layer is a refractory brick layer (500); the second layer is a high-purity aluminum silicate cotton blanket layer (600); and the third layer is a hard fiberboard layer (700).
2. The composite insulation layer structure for a mesh belt furnace according to claim 1, characterized in that: The thickness of the refractory brick layer (500) is 113 mm.
3. The composite insulation layer structure for a mesh belt furnace according to claim 1, characterized in that: The refractory bricks used in the refractory brick layer (500) are selected according to the operating temperature of the mesh belt furnace; When the operating temperature of the mesh belt furnace is below 1150℃, the refractory brick layer (500) uses T23 mullite bricks, which have a temperature resistance rating of 1350℃ and a thermal conductivity of 0.22W / m·K. When the mesh belt furnace is a high-temperature sintering furnace, the refractory brick layer (500) uses T28 mullite bricks, which have a temperature resistance rating of 1540℃ and a thermal conductivity of 0.32W / m·K.
4. The composite insulation layer structure for a mesh belt furnace according to claim 1, characterized in that: When the mesh belt furnace is used to process products containing a large amount of zinc oxide, the refractory brick base (400) is selected from heavy refractory bricks.
5. The composite insulation layer structure for a mesh belt furnace according to claim 1, characterized in that: The high-purity aluminum silicate cotton blanket layer (600) is made of high-purity aluminum silicate cotton blanket, with a temperature resistance rating of 1260℃ and a thermal conductivity of 0.035-0.045W / (m·K).
6. The composite insulation layer structure for a mesh belt furnace according to claim 5, characterized in that: The high-purity aluminum silicate cotton blanket is made by manually stacking.
7. The composite insulation layer structure for a mesh belt furnace according to claim 5, characterized in that: The high-purity aluminum silicate cotton blanket is made by pre-compression.
8. The composite insulation layer structure for a mesh belt furnace according to claim 1, characterized in that: The hardboard layer (700) is selected from rotary block hardboard.
9. The composite insulation layer structure for a mesh belt furnace according to claim 1, characterized in that: The furnace body is provided with an upper heating rod (800) and a lower heating rod (900) on the upper and lower sides of the furnace chamber (200), respectively; the heat insulation cotton (300) is provided above the upper heating rod (800), and the refractory brick base (400) is provided below the lower heating rod (900).
10. The composite insulation layer structure for a mesh belt furnace according to claim 9, characterized in that: The upper heating rod (800) and the lower heating rod (900) are fixed at both ends to the third layer of insulation structure.