Roller furnace

Abstract

The roller bed furnace comprises a furnace body, a supporting roller set, one or more main heaters and a plurality of side heating assemblies, the supporting roller set is arranged in the furnace body and used for supporting materials, and the supporting roller set comprises a plurality of guide rollers with the two ends supported on the side wall of the furnace body; the main heater penetrates through the width of the whole furnace body; the side heating assemblies are arranged on the two side walls of the furnace body, each side heating assembly comprises a side heater, an installation brick and a glass plate, the glass plates and the installation bricks are extruded into the preformed holes respectively, gaps are formed between the glass plates and the installation bricks, the side heaters are fixed to the installation bricks and extend into the gaps, and the glass plates are closer to the interior of the furnace body than the installation bricks. According to the roller bed furnace, by arranging the improved side heating assembly, a side heating source can be prevented from being corroded and damaged by material powder, the stability and safety are improved, the temperature of the saggar close to the side wall of the furnace body can not rise too fast due to the fact that the glass plate serves as a heat buffer, and the consistency of the temperature of the saggar is further guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy equipment, and particularly relates to an improved roller hearth furnace. Background Art

[0002] With the continuous development of technology and policy support, new energy vehicles have achieved great development in recent years. The battery types are mainly divided into ternary lithium and lithium iron phosphate. Although ternary lithium has better low-temperature performance and higher energy density, its thermal stability is poor. On the contrary, although lithium iron phosphate has a low energy density, it has high thermal stability and is not prone to danger. Therefore, more and more new energy vehicles choose lithium iron phosphate batteries as the energy source. During the production of lithium iron phosphate batteries, the positive electrode material needs to be placed in a crucible and sintered in a roller hearth furnace. In order to improve production efficiency, as many crucibles loaded with lithium iron phosphate materials as possible are placed in the roller hearth furnace. However, if too many crucibles are stacked, the temperature difference between different crucibles will be obvious, resulting in a decrease in the finished product rate. And in order to increase the number of crucibles in the furnace, whether increasing the number of guide rollers or the number of stacked crucibles will increase the height of the furnace body, which makes it difficult to ensure the temperature uniformity in the furnace.

[0003] The information disclosed in this background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0004] The purpose of the present invention is to provide an improved roller hearth furnace, which can ensure the temperature uniformity at different positions in the furnace while increasing the space in the furnace.

[0005] To achieve the above purpose, a specific embodiment of the present invention provides a roller hearth furnace, including a furnace body, a support roller group, one or more main heaters, and a plurality of side heating components. The support roller group is arranged in the furnace body and used to support materials, including a plurality of guide rollers supported at both ends on the side walls of the furnace body. The main heater is arranged throughout the width of the furnace body. The side heating components are arranged on both 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 there is a gap between them. The side heater is fixed on the mounting brick and extends into the gap. The glass plate is closer to the inside of the furnace body than the mounting brick.

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

[0007] In one or more embodiments of the present invention, at least two sets of support rollers are arranged vertically inside the furnace body.

[0008] In one or more embodiments of the present invention, main heaters are arranged above and below each set of support rollers.

[0009] In one or more embodiments of the present invention, side heating assemblies are arranged on the side walls of the furnace body on both sides above each set of support rollers, and each side heating assembly is independently controlled to be turned on and off.

[0010] In one or more embodiments of the present invention, a protective sleeve is sleeved outside the main heater, 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 hearth furnace further includes an air inlet arranged at the bottom of the furnace body, and a meandering air inlet pipe communicating the inside and outside of the furnace body is arranged in the air inlet.

[0012] In one or more embodiments of the present invention, the air inlet includes two air inlet pipes arranged vertically and communicating with each other, and the air inlet pipe located above communicates with the inside of the furnace body.

[0013] In one or more embodiments of the present invention, a ceramic plate is laid on the inner wall of the air inlet pipe, and / or the outer corners inside the air inlet pipe are arc-shaped corners.

[0014] In one or more embodiments of the present invention, multiple groups of air inlet pipes are arranged in the air inlet, and each group of air inlet pipes respectively includes two air inlet pipes arranged vertically and communicating with each other.

[0015] Compared with the prior art, the roller hearth furnace of the present invention can avoid the corrosion and damage of the side heating source by material powder by arranging an improved side heating assembly, improving the stability and safety. Secondly, as a heat buffer, the glass plate can also prevent the saggers near the side wall of the furnace body from heating up too fast, further ensuring the consistency of the sagger temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is an axial schematic diagram of the roller hearth furnace in an embodiment of the present invention; Figure 2Schematic diagram of the measuring heating component in an embodiment of the present invention; Figure 3 Schematic diagram of the lower layer of the air inlet in an embodiment of the present invention; Figure 4 Schematic diagram of the upper layer of the air inlet in an embodiment of the present invention.

[0018] Description of main reference numerals: 100 - roller hearth furnace, 10 - furnace body, 20 - guide roller, 31 - main heater, 32 - side heating component, 321 - side heater, 322 - installation brick, 323 - glass plate, 324 - gap, 325 - silicon carbide square tube, 33 - protective sleeve, 40 - air inlet, 41 - air inlet pipe, 42 - ceramic plate. Detailed implementation manners

[0019] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] As Figure 1-2 shown, the roller hearth furnace 100 in an embodiment of the present invention includes a furnace body 10, a support roller group, one or more main heaters 31, and a plurality of side heating components 32. The support roller group is arranged in the furnace body 10 and is used to support materials, and it includes a plurality of guide rollers 20 supported at both ends on the side walls of the furnace body 10, and the guide rollers 20 are arranged along the transmission direction of the materials in the furnace body 10. The main heater 31 is arranged throughout the width of the entire furnace body 10, and it is arranged above and / or below the guide rollers 20. The side heating components 32 are arranged on both side walls in the furnace body 10, and reserved holes for placing and fixing the side heating components 32 are provided on the side walls of the furnace body 10. The side heating component 32 includes a side heater 321, an installation brick 322, and a glass plate 323. Among them, the glass plate 323 and the installation brick 322 are respectively fixed in the reserved holes and a gap 324 is formed between the two, and the glass plate 323 is closer to the interior of the furnace body 10. The side heater 321 is fixed on the installation brick 322 and extends into the gap 324.

[0021] By setting the side heating component 32, the front glass plate 323 makes the side heater 321 not directly exposed to the furnace interior space, which can prevent dust generated by sintering in the furnace from entering the gap 324, avoid corrosion of the side heater 321, and improve its stability and safety; secondly, the glass plate 323 can serve as a heat buffer, so that the sagger near the side heating component 32 will not heat up too fast, ensuring the consistency of the sagger temperature.

[0022] Preferably, the side heating assembly 32 further includes a silicon carbide square tube 325, which is disposed above the side heater 321 and is pressed between the installation bricks 322, the glass plate 323 and the top wall of the reserved hole, so as to increase the force, ensure the structural integrity of the furnace wall, and at the same time reduce or avoid the force on the installation bricks 322, facilitating installation and disassembly.

[0023] 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, preventing problems such as abnormal local temperatures (too high or too low) caused by the synchronous heating or cooling of the side heater 321 and the main heater 31.

[0024] Preferably, several holes can be reserved on the installation bricks 322, so that when the side heater 321 is damaged or needs to be disassembled and maintained for other reasons, the installation bricks 322 together with the side heater 321 can be quickly removed and installed by tools, making maintenance more convenient.

[0025] In one embodiment, to increase the number of saggers in the furnace, if only a single set of support rollers is provided in the furnace, the stacking number of saggers increases. Excessive stacking numbers may lead to a decrease in temperature uniformity, a significant expansion of the temperature difference between different saggers, and even a decrease in the finished product rate. Therefore, in one embodiment, two sets of support rollers are provided in the furnace body 10, and the two sets of support rollers are arranged one above the other. Without changing the original structure of the furnace body 10, the stacking number of saggers on a single set of support rollers is reduced, ensuring the temperature uniformity of different saggers and reducing the rejection rate.

[0026] The temperature of the saggers near the two side furnace walls is lower than that of the saggers in the middle position, and the design of the double support roller set raises the furnace wall and increases the furnace wall area at the same time, which will inevitably exacerbate the above problems. Therefore, side heating assemblies 32 are provided on the side walls of the furnace body 10 on both sides above each support roller set to ensure that a side heat source is added to the saggers stacked on each support roller set, thereby accurately compensating the temperature in the furnace and ensuring the temperature uniformity of the saggers.

[0027] In this embodiment, both the main heater 31 and the side heater 321 adopt electric heating rods. Compared with traditional natural gas burners, the electric heating rods require less preparatory work, occupy less space under the same heating power, have a wider application range, stronger applicability, and higher safety.

[0028] Preferably, a protective sleeve 33 is provided outside the main heater 31 to protect the main heater 31 and prevent oxides generated by its high temperature from falling into the sintering material in the saggar and causing pollution.

[0029] As shown Figure 3-4 In the figure, an air inlet device 40 is provided at the bottom of the furnace body 10, and a meandering air inlet pipe 41 that communicates with the inside and outside of the furnace body 10 is provided in the air inlet device 40. The meandering air inlet pipe 41 has a relatively long length, and the time for the gas to flow into the furnace becomes longer. Therefore, the gas preheating time is increased, so that there is no obvious temperature difference between the temperature of the gas flowing into the furnace and the temperature in the furnace, effectively ensuring the temperature consistency.

[0030] Furthermore, the air inlet device 40 adopts a double-layer design, that is, two air inlet pipes 41 are provided in the air inlet device 40. The two air inlet pipes 41 are arranged up and down and communicate with each other. The air inlet pipe 41 ( Figure 3 shown in the figure) has a first end 41a for connecting to an external gas source, and a second end 41b communicating with the first end 42A of the upper air inlet pipe 41 ( Figure 4 shown in the figure). The second end 42B of the upper air inlet pipe 41 communicates with the furnace interior. By providing an air inlet pipe with a double spiral structure, the external gas source is preheated for the first time after entering the lower air inlet pipe 41, and then enters the upper air inlet pipe 41 for the second preheating. The gas after two rounds of preheating is closer to the temperature in the furnace and will not cause temperature disturbance or even damage the original atmosphere when entering the furnace.

[0031] Since the temperature in the furnace is relatively high, if ordinary refractory bricks are used to make the air inlet device 40, the surface of the refractory bricks may be powdered, resulting in a large amount of dust in the furnace. The dust entering the furnace lining will cause pollution of the furnace atmosphere, and the dust deposited in the air inlet pipe 41 will cause a decrease in gas flow rate and even block the air inlet pipe. To avoid this situation, a ceramic plate 42 is laid on the inner wall of the air inlet pipe, which can effectively avoid the powdering situation. Secondly, the ceramic plate 42 can reduce the friction between the gas flow and the inner wall of the air inlet pipe, ensuring the air flow and air pressure.

[0032] Furthermore, the outer corner in the air inlet pipe 41 is set as an arc corner to reduce the air pressure loss generated when the air flow turns, so that the gas can enter the furnace with sufficient air pressure. Of course, the inner corner of the air inlet pipe 41 can also be set as an arc corner to further ensure the intake air pressure.

[0033] To ensure the intake efficiency, multiple groups of air inlet pipes 41 are provided in the air inlet device 40. Each group of air inlet pipes 41 respectively includes air inlet pipes 41 arranged up and down and communicating with each other. Through such a setting, an air intake matrix composed of multiple groups of air inlet pipes 41 is formed to disperse the air inlets and ensure the intake efficiency.

[0034] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0035] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard 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 in that, Comprising: A furnace body; A support roller group, disposed inside the furnace body and used for supporting materials, including a plurality of guide rollers supported at both ends on the side wall of the furnace body; One or more main heaters, arranged across the entire width of the furnace body; And A plurality of side heating components, which are arranged on both 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 there is a gap between the two. The side heater is fixed on the mounting brick and extends into the gap. The glass plate is closer to the inside of the furnace body than the mounting brick.

2. The roller hearth furnace according to claim 1, wherein, The side heating component further includes a silicon carbide square tube, which is arranged above the side heater and is pressed between the top of the mounting brick, the glass plate, and the top wall of the reserved hole.

3. The roller hearth furnace according to claim 2, characterized in that, At least two of the support roller groups are arranged vertically inside the furnace body.

4. The roller hearth furnace according to claim 3, characterized in that, The main heaters are arranged above and below each of the support roller groups.

5. The roller hearth furnace according to claim 3, wherein The side heating components are arranged on the side walls of the furnace body on both sides above each support roller group. Each side heating component is independently controlled to be turned on and off.

6. The roller hearth furnace according to claim 1, characterized in that, A protective sleeve is sleeved outside the main heater, and / or The main heater and the side heater are electric heating rods.

7. The roller hearth furnace according to claim 1, characterized in that It further includes an air inlet arranged at the bottom of the furnace body. A zigzag air inlet pipe communicating with the inside and outside of the furnace body is arranged inside the air inlet.

8. The roller hearth furnace according to claim 7, characterized in that, The air inlet includes two air inlet pipes arranged vertically and communicating with each other. The air inlet pipe located above is communicated with the inside of the furnace body.

9. The roller hearth furnace according to claim 8, characterized in that, A ceramic plate is laid on the inner wall of the air inlet pipe, and / or The outer corners inside the air inlet pipe are arc-shaped corners.

10. The roller hearth furnace according to claim 8, wherein, Multiple groups of the air inlet pipes are arranged inside the air inlet. Each group of air inlet pipes respectively includes two air inlet pipes arranged vertically and communicating with each other.

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