roller hearth furnace

Abstract

This utility model discloses a roller furnace, including a furnace body, a support roller assembly, one or more main heaters, and multiple side heating components. The support roller assembly is disposed within the furnace body and is used to support materials, including multiple guide rollers supported at both ends on the side walls of the furnace body. The main heaters extend through the entire width of the furnace body. The side heating components are disposed on the two side walls of the furnace body. Each side heating component includes a side heater, mounting bricks, and a glass plate. The glass plate and mounting bricks are respectively pressed into pre-drilled holes, forming a gap between them. The side heater is fixed to the mounting bricks and extends into the gap. The glass plate is closer to the interior of the furnace body than the mounting bricks. This utility model's roller furnace, by setting improved side heating components, can avoid the side heating source being corroded and damaged by material powder, improving stability and safety. Secondly, the glass plate, acting as a heat buffer, can prevent the saggers near the side walls of the furnace body from heating too quickly, further ensuring the uniformity of the sagger temperature.

Description

Technical Field

[0001] This utility model belongs to the field of new energy equipment technology, specifically relating to an improved roller furnace. Background Technology

[0002] With the continuous development of technology and policy support, new energy vehicles have achieved significant growth in recent years. Battery types are mainly divided into ternary lithium and lithium iron phosphate. Although ternary lithium batteries have better low-temperature resistance and higher energy density, their thermal stability is poor. Conversely, while lithium iron phosphate batteries have lower energy density, their thermal stability is higher and less prone to hazards. Therefore, more and more new energy vehicles are choosing lithium iron phosphate batteries as their energy source. In the production of lithium iron phosphate batteries, the cathode material needs to be placed in a sagger and sintered in a roller furnace. To improve production efficiency, as many saggers containing lithium iron phosphate material as possible are placed in the roller furnace. However, stacking too many saggers leads to significant temperature differences between different saggers, resulting in a decrease in yield. Furthermore, increasing the number of saggers in the furnace, whether by increasing the number of guide rollers or stacking saggers, increases the height of the furnace, making it difficult to ensure temperature uniformity within the furnace.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide an improved roller furnace that can increase the furnace space while ensuring temperature consistency at different locations within the furnace.

[0005] To achieve the above objectives, a specific embodiment of this utility model provides a roller furnace, including a furnace body, a support roller assembly, one or more main heaters, and multiple side heating components. The support roller assembly is disposed within the furnace body and is used to support materials, including multiple guide rollers supported at both ends on the side walls of the furnace body. The main heaters extend through the entire width of the furnace body. The side heating components are disposed on both side walls of the furnace body, and each side heating component includes a side heater, a mounting brick, and a glass plate. The glass plate and the mounting brick are respectively pressed into pre-drilled holes, and a gap is formed between them. The side heater is fixed to the mounting brick and extends into the gap. The glass plate is closer to the interior of the furnace body than the mounting brick.

[0006] In one or more embodiments of the present invention, the side heating assembly further includes a silicon carbide square tube, which is disposed above the side heater and pressed between the top of the mounting brick and glass plate and the top wall of the reserved hole.

[0007] In one or more embodiments of this utility model, at least two support roller groups arranged vertically are provided inside the furnace body.

[0008] In one or more embodiments of this utility model, the main heater is provided above and below each of the support roller groups.

[0009] In one or more embodiments of this utility model, the side heating components are provided on the furnace sidewalls on both sides above each support roller group, and each side heating component is independently controlled to be turned on and off.

[0010] In one or more embodiments of this utility model, the main heater is provided with a protective sleeve, and / or the main heater and the side heater are electric heating rods.

[0011] In one or more embodiments of the present invention, the roller furnace further includes an air inlet disposed at the bottom of the furnace body, wherein the air inlet is provided with a meandering air inlet pipe that connects the inside and outside of the furnace body respectively.

[0012] In one or more embodiments of this utility model, the air inlet includes two air inlet pipes arranged vertically and communicating with each other, with the upper air inlet pipe communicating with the interior of the furnace body.

[0013] In one or more embodiments of this utility model, a ceramic plate is laid on the inner wall of the air intake pipe, and / or the outer corner of the air intake pipe is an arc-shaped corner.

[0014] In one or more embodiments of this utility model, the air intake is provided with multiple sets of air intake pipes, each set of air intake pipes including two air intake pipes arranged vertically and connected to each other.

[0015] Compared with the prior art, the roller furnace of this utility model can avoid the side heating source from being corroded and damaged by material powder by setting an improved side heating component, thus improving stability and safety. Secondly, the glass plate, as a heat buffer, can also prevent the saggers near the side wall of the furnace from heating too quickly, further ensuring the uniformity of the sagger temperature. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an axial schematic diagram of a roller furnace in one embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the heating assembly in one embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the lower layer of the air intake in one embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the upper layer of the air intake in one embodiment of the present invention.

[0021] Explanation of key figure labels:

[0022] 100-Roller furnace, 10-Furnace body, 20-Guide roller, 31-Main heater, 32-Side heating assembly, 321-Side heater, 322-Mounting brick, 323-Glass plate, 324-Gap, 325-Silicon carbide square tube, 33-Protective sleeve, 40-Inlet device, 41-Inlet pipe, 42-Ceramic plate. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0024] like Figure 1-2 As shown, a roller furnace 100 in one embodiment of the present invention includes a furnace body 10, a support roller assembly, one or more main heaters 31, and multiple side heating components 32. The support roller assembly is disposed within the furnace body 10 and is used to support materials. It includes multiple guide rollers 20 with both ends supported on the side walls of the furnace body 10. The guide rollers 20 are arranged within the furnace body 10 along the material conveying direction. The main heaters 31 are disposed across the entire width of the furnace body 10, above and / or below the guide rollers 20. The side heating assembly 32 is disposed on both sides of the furnace body 10. The side walls of the furnace body 10 are provided with reserved holes for placing and fixing the side heating assembly 32. The side heating assembly 32 includes a side heater 321, a mounting brick 322 and a glass plate 323. The glass plate 323 and the mounting brick 322 are respectively fixed in the reserved holes and a gap 324 is formed between them. The glass plate 323 is closer to the inside of the furnace body 10. The side heater 321 is fixed on the mounting brick 322 and extends into the gap 324.

[0025] By setting up the side heating assembly 32, the glass plate 323 at the front end prevents the side heater 321 from being directly exposed to the furnace space, thus preventing dust generated during sintering in the furnace from entering the gap 324, avoiding corrosion of the side heater 321, and improving its stability and safety. Secondly, the glass plate 323 can act as a heat buffer, preventing the sagger near the side heating assembly 32 from heating too quickly, thus ensuring the uniformity of the sagger temperature.

[0026] Preferably, the side heating assembly 32 further includes a silicon carbide square tube 325, which is disposed above the side heater 321 and pressed between the mounting brick 322, the glass plate 323 and the top wall of the reserved hole, to improve the stress, ensure the structural integrity of the furnace wall, and at the same time reduce or avoid the stress on the mounting brick 322, making it easy to install and disassemble.

[0027] In one embodiment, each side heater 32 is controlled by an independent SCR (Silicon Controlled Rectifier) ​​module to ensure that each side heater 32 operates independently and to prevent local temperature abnormalities (too high or too low) caused by the side heater 321 and the main heater 31 heating or cooling synchronously.

[0028] Preferably, several holes can be pre-drilled in the mounting block 322 so that when the side heater 321 is damaged or needs to be disassembled for maintenance for other reasons, the mounting block 322 can be quickly removed and installed together with the side heater 321 using tools, making maintenance more convenient.

[0029] In one embodiment, to increase the number of saggers in the furnace, if only a single support roller group is set in the furnace, the number of stacked saggers will increase. Excessive stacking may lead to reduced temperature uniformity, a significant increase in temperature difference between different saggers, and even a decrease in yield. Therefore, in one embodiment, two support roller groups are set inside the furnace body 10, one above the other. Without changing the original structure of the furnace body 10, the number of stacked saggers on a single support roller group is reduced, ensuring temperature uniformity between different saggers and reducing the defect rate.

[0030] The temperature of the saggers near the sides of the furnace wall is lower than that of the saggers in the middle. Furthermore, the double-support roller design raises the furnace wall and increases its area, inevitably exacerbating this problem. Therefore, side heating components 32 are installed on the side walls of the furnace body 10 above each support roller assembly to provide a lateral heat source for the saggers stacked on each support roller assembly, thereby accurately compensating for the furnace temperature and ensuring temperature consistency of the saggers.

[0031] In this embodiment, both the main heater 31 and the side heater 321 use electric heating rods. Compared with traditional natural gas burners, electric heating rods require less preparation work, need less space for the same heating power, have a wider range of applications, are more adaptable, and are safer.

[0032] Preferably, a protective sleeve 33 is provided outside the main heater 31 to protect the main heater 31 and prevent the oxides generated at high temperature from falling into the sintering material in the sagger and causing contamination.

[0033] like Figure 3-4 As shown, an air inlet 40 is provided at the bottom of the furnace body 10, and a meandering air inlet pipe 41 is provided inside the air inlet 40, which connects the inside and outside of the furnace body 10 respectively. The meandering air inlet pipe 41 is relatively long, and the time for the gas to flow into the furnace is longer, thus increasing the gas preheating time. This ensures that there is no significant temperature difference between the gas temperature flowing into the furnace and the furnace temperature, effectively guaranteeing temperature consistency.

[0034] Furthermore, the air intake 40 adopts a double-layer design, that is, two air intake pipes 41 are provided inside the air intake 40. The two air intake pipes 41 are arranged vertically and connected to each other, wherein the lower air intake pipe 41 ( Figure 3 The first end 41a (as shown in the diagram) is used to connect to an external air source, and the second end 41b is connected to the upper air intake pipe 41 (…). Figure 4 As shown in the diagram, the first end 42A and the second end 42B of the upper air inlet pipe 41 are connected to the furnace. Through the double-spiral structure of the air inlet pipe, external air enters the lower air inlet pipe 41 for the first round of preheating, and then enters the upper air inlet pipe 41 for the second round of preheating. After two rounds of preheating, the gas is closer to the furnace temperature and will not cause temperature disturbances or disrupt the original atmosphere upon entering the furnace.

[0035] Due to the high temperature inside the furnace, if ordinary refractory bricks were used to make the air inlet 40, the surface of the refractory bricks might pulverize, resulting in a large amount of dust inside the furnace. Dust entering the furnace lining would pollute the furnace atmosphere, and dust deposited inside the air inlet pipe 41 would reduce gas flow or even block the air inlet pipe. To avoid this, a ceramic plate 42 is laid on the inner wall of the air inlet pipe, which effectively prevents pulverization. Secondly, the ceramic plate 42 can reduce friction between the gas and the inner wall of the air inlet pipe during gas flow, ensuring airflow and pressure.

[0036] Furthermore, the outer corner of the intake pipe 41 is set as an arc-shaped corner to reduce the pressure loss caused by the airflow turning, so that the gas can enter the furnace with sufficient pressure. Of course, the inner corner of the intake pipe 41 can also be set as an arc-shaped corner to further ensure the intake pressure.

[0037] To ensure air intake efficiency, multiple sets of air intake pipes 41 are provided in the air intake 40. Each set of air intake pipes 41 includes air intake pipes 41 arranged vertically and connected to each other. This arrangement forms an air intake matrix composed of multiple sets of air intake pipes 41 to disperse the air intake and ensure air intake efficiency.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A roller hearth furnace characterized by, include: Furnace body; A support roller assembly, disposed within the furnace body and used to support materials, includes multiple guide rollers with both ends supported on the side walls of the furnace body; One or more main heaters are installed across the entire width of the furnace body; as well as Multiple side heating components are disposed on the two side walls of the furnace body. Each side heating component includes a side heater, a mounting brick, and a glass plate. The glass plate and the mounting brick are respectively pressed into a reserved hole and a gap is formed between them. The side heater is fixed to the mounting brick and extends into the gap. The glass plate is closer to the interior of the furnace body than the mounting brick.

2. Roller hearth furnace according to claim 1, characterized in that The side heating assembly also includes a silicon carbide square tube, which is disposed above the side heater and pressed between the top of the mounting brick and glass plate and the top wall of the reserved hole.

3. Roller hearth furnace according to claim 2, characterized in that The furnace body is equipped with at least two sets of support rollers arranged vertically.

4. Roller hearth furnace according to claim 3, characterized in that The main heater is provided above and below each of the support roller groups.

5. The roller hearth furnace of claim 3 wherein, Each of the two sides of the furnace body above each support roller group is equipped with a side heating component, and each side heating component is independently controlled to be turned on and off.

6. The roller hearth furnace of claim 1 wherein, The main heater housing is equipped with a protective sleeve, and / or The main heater and the side heater are electric heating rods.

7. The roller hearth furnace of claim 1 wherein, It also includes an air inlet located at the bottom of the furnace body, wherein the air inlet is provided with a meandering air inlet pipe that connects the inside and outside of the furnace body.

8. Roller hearth furnace according to claim 7, characterized in that The air inlet includes two air inlet pipes that are arranged vertically and connected to each other, with the upper air inlet pipe connected to the interior of the furnace body.

9. Roller hearth furnace according to claim 8, characterized in that The inner wall of the intake pipe is lined with a ceramic plate, and / or The outer corner inside the intake pipe is an arc-shaped corner.

10. The roller hearth furnace of claim 8, wherein, The air intake is provided with multiple sets of air intake pipes, each set of air intake pipes including two air intake pipes arranged vertically and connected to each other.

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