Tunnel kiln
By installing ventilation troughs and heating gas delivery devices in the tunnel kiln, the problem of insufficient atmosphere contact between the inside and outside of the sagger was solved, improving material quality and extending the life of the equipment, thus ensuring the normal operation of the kiln car.
Patent Information
- Application Number
- CN202423244144.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-26
AI Technical Summary
In the existing electrically heated trolley-type tunnel kiln, insufficient contact between the atmosphere inside and outside the sagger during the sintering process of lithium battery materials leads to inconsistent material properties, and there are also problems of unstable air pressure and excessively high temperature during kiln car operation.
Ventilation slots are installed on the saggers in the tunnel kiln, and heating and gas supply devices are arranged at intervals along the length of both sides of the kiln. The atmosphere gas is evenly distributed to the inside and outside of the sagger through the ventilation slots and gas outlets. At the same time, air intake structures are set at the bottom and top of the kiln car for cooling and isolation air curtains, forming an isolation curve channel to prevent hot gas from escaping downwards.
This achieves full contact between the atmosphere and gas inside and outside the sagger, improving the quality of material production. It also prevents waste gas from entering the heating device through positive pressure, extending the device's lifespan. At the same time, it prevents excessive pressure at the top of the kiln car, ensuring the normal operation of the kiln car.
Smart Images
Figure CN223623355U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of kiln technology, specifically to a tunnel kiln. Background Technology
[0002] Existing kilns used for mass production of lithium battery materials sintering are mainly roller kilns and pusher kilns. Roller kilns, with their roller bar transport method, are prone to uneven kiln unloading and even accidents like kiln rubbing against the walls due to limitations in roller load capacity and long transport distances. Pusher kilns, using hydraulic propulsion, are also limited by transport distances, resulting in low output and low production efficiency, failing to meet the growing market demand. In contrast, electrically heated trolley-type tunnel kilns, with multi-layer stacked kilns for material loading and kiln cars carrying the kilns for transport, offer advantages such as long transport distances, high capacity, and low energy consumption. Furthermore, compared to gas-fired tunnel kilns, electrically heated trolley-type tunnel kilns can meet the high requirements of the lithium battery material sintering process, such as full sealing and no interference from combustion heating gases, and are gradually becoming the development trend in the lithium battery material sintering equipment market. However, electrically heated tunnel kilns also bring the following disadvantages:
[0003] 1. In the sintering production of lithium battery materials, tunnel kilns often stack saggers on kiln cars for multi-layer sintering. If the saggers are stacked to three layers or more, the material inside will not have sufficient contact with process gases such as nitrogen, air or oxygen. This will inevitably lead to inconsistencies in the properties of the external and internal materials, reduce product quality, and even cause product performance to deteriorate.
[0004] 2. Tunnel kilns use a method where materials are loaded into saggers and kiln cars carry the saggers forward. This can lead to unstable air pressure, hot air rising downwards, excessively high temperatures at the bottom of the kiln cars, burnt wheel bearings, and high-temperature deformation of the guide rails, causing the kiln cars to jam. Utility Model Content
[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a tunnel kiln that ensures that both the inner and outer sides of the sagger are in full contact with the atmosphere gas, thereby improving the quality of material production.
[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0007] A tunnel kiln includes a tunnel kiln and a kiln car that moves along the length of the tunnel kiln. The kiln car is equipped with multiple sets of sagger stacks formed by stacking multiple saggers. The multiple sets of sagger stacks are arranged at intervals along the width of the tunnel kiln. Each sagger is provided with a ventilation groove for air to pass through the inside and outside of the sagger. Multiple heating and gas supply devices are arranged at intervals along the length of both sides of the tunnel kiln. The kiln car is located between the heating and gas supply devices on both sides. The heating and gas supply devices are provided with multiple first gas outlets, and the multiple first gas outlets are aligned one-to-one with the multiple ventilation grooves.
[0008] As a further improvement to the above technical solution:
[0009] The heating and gas supply device includes a heating element, an inlet pipe, and an outlet pipe. The outlet pipe is located on the tunnel kiln, and the heating element is installed inside the outlet pipe. One end of the inlet pipe is connected to the tunnel kiln, and the other end is connected to the outlet pipe. The connection between the inlet pipe and the outlet pipe is located at the cold end of the heating element. The hot end of the heating element faces the sagger stack, and the height of the hot end of the heating element is greater than the height of the sagger stack. Each of the first outlets is arranged at intervals on the outlet pipe.
[0010] The cold end of the heating element is mounted on the air outlet pipe via a support member, and heat insulation cotton is provided between the heating element, the air outlet pipe and the support member.
[0011] The support component is a ceramic plug.
[0012] The tunnel kiln is provided with refractory mounting seats on both sides. The kiln car runs between the refractory mounting seats on both sides and leaves a gap between them. The air outlet pipe is installed on the refractory mounting seat. Multiple first air inlet structures are arranged at intervals along the length of the refractory mounting seat. The first air inlet structure includes multiple first air outlet channels arranged at intervals. The outlet of the first air outlet channel faces the kiln car. The kiln car includes a frame. The bottom of the frame is provided with wheels. The top of the frame is provided with a refractory base. The saggers are stacked on the refractory base. The refractory base is provided with a second air inlet structure. The second air inlet structure includes a main channel and a branch channel. The top of the main channel is provided with multiple second air outlet channels extending to the top surface of the refractory mounting seat. The outlet of the first air outlet channel faces the inlet of the branch channel.
[0013] If the saggers are stacked in two sets, the main channel is located between the two sets of saggers. Multiple branch channels are connected to both sides of the main channel, and the branch channels on both sides correspond one-to-one with the first air outlet channels on both sides.
[0014] If the sagger stacks are arranged in three or more groups, a main channel is provided between adjacent sagger stacks, and multiple branch channels are connected between two adjacent main channels and outside the two outermost main channels. The outermost branch channels correspond one-to-one with the first air outlet channels on both sides.
[0015] The first air intake structure also includes a main channel, a plurality of first air outlet channels are located on one side of the main channel, and an air intake channel is provided on the other side of the main channel.
[0016] The air intake channel and the first air outlet channel are connected to the main road in a staggered manner, and the branch roads on both sides of the main road are connected to the main road in a staggered manner.
[0017] Multiple third air intake structures are also arranged at intervals along the length of the refractory mounting base. Each of the multiple third air intake structures is arranged below a multiple first air intake structures. The car frame has a first protrusion on both sides, and the refractory base has a second protrusion on both sides. The tunnel kiln has a first groove and a second groove on both sides corresponding to the first protrusion and the second protrusion. An isolation curve channel is formed between the kiln car and the refractory mounting base through the first protrusion, the first groove, the second protrusion, and the second groove. The third air intake structure is used to supply air to the isolation curve channel, and the air outlet of the third air intake structure is located between the first groove and the second groove.
[0018] Multiple fourth air intake structures are also arranged at intervals along the length of the refractory mounting base. Each of the multiple fourth air intake structures is arranged below a multiple third air intake structure. The fourth air intake structures are used to supply air to the bottom of the kiln car for cooling.
[0019] The distance between two adjacent first air inlet structures is the single step distance of the kiln car, and the distance between two adjacent first air outlets is the distance between two adjacent air ducts.
[0020] Compared with the prior art, the advantages of this utility model are:
[0021] The tunnel kiln disclosed in this utility model has ventilation grooves on the saggers to allow air to pass between the inside and outside of the saggers. The first air outlets of the heating gas supply device face the ventilation grooves one by one. After the atmospheric gas is introduced into the heating gas supply device for heating, it is output in multiple streams through multiple first air outlets. Each stream of atmospheric gas is blown from the outside to the inside of the corresponding sagger through the ventilation grooves, so that the inside and outside of each sagger at different heights can fully contact the atmospheric gas. The atmospheric gas can efficiently radiate heat to the material, improving the production quality of the material. At the same time, since the heating gas supply device outputs gas through the first air outlet, that is, the heating gas supply device is in a positive pressure state, it can also prevent the waste gas generated during the production process from entering the heating gas supply device, thereby improving the service life of the heating gas supply device.
[0022] Furthermore, in the tunnel kiln disclosed in this utility model, each of the first gas outlet channels outputs atmospheric gas, and the atmospheric gas in each of the first gas outlet channels on both sides enters the main channel through the branch channels on both sides. The main channel outputs to the top surface through the second gas outlet channel. Since the main channel is located between the two sets of sagger stacks, the atmospheric gas is output from between the two sets of sagger stacks, which further ensures that the inner side of the two sets of sagger stacks is in full contact with the atmospheric gas, thereby improving production quality.
[0023] Furthermore, the tunnel kiln disclosed in this utility model sends air to the isolation curve channel through the third air intake structure, forming an air curtain that separates the upper and lower spaces, preventing excessive pressure at the top of the kiln car from causing hot air to flow downwards, thus protecting the car frame and wheels for normal operation.
[0024] Furthermore, the tunnel kiln disclosed in this utility model has a fourth air intake structure for supplying air to the bottom of the kiln car for cooling, thereby providing localized cooling to the frame, wheels, and internal bearings to ensure the normal operation of the kiln car. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the main cross-sectional structure of the tunnel kiln of this utility model.
[0026] Figure 2 This is a schematic diagram of the gas outlet pipe in the tunnel kiln of this utility model.
[0027] Figure 3 This is a cross-sectional schematic diagram of the first and second air intake structures in the tunnel kiln of this utility model.
[0028] Figure 4 This is a side view cross-sectional structural diagram (single section) of the tunnel kiln of this utility model.
[0029] The labels in the diagram represent: 1. Tunnel kiln; 11. First groove; 12. Second groove; 13. Guide rail; 2. Kiln car; 21. Car frame; 211. First boss; 22. Wheel; 23. Refractory base; 231. Second boss; 24. Second air intake structure; 241. Main channel; 242. Branch channel; 243. Second air outlet channel; 3. Sagger stack; 31. Sagger; 32. Ventilation groove; 4. Heating and gas supply device; 41. Heating element; 42. Air inlet pipe; 43. Air outlet pipe; 44. Support component; 45. Insulation cotton; 5. First air outlet; 6. Refractory mounting base; 61. First air intake structure; 611. First air outlet channel; 612. Main channel; 613. Air intake channel; 62. Third air intake structure; 63. Fourth air intake structure; 7. Isolation curve channel. Detailed Implementation
[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0031] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0034] Figures 1 to 4 This invention illustrates an embodiment of a tunnel kiln. The tunnel kiln of this embodiment includes a tunnel kiln 1 and a kiln car 2 that moves along the length of the tunnel kiln 1. The kiln car 2 is provided with multiple sets of sagger stacks 3 formed by stacking multiple saggers 31. The multiple sets of sagger stacks 3 are arranged at intervals along the width of the tunnel kiln 1. Each sagger 31 is provided with a ventilation groove 32 for ventilation between the inside and outside of the sagger 31. Multiple heating and gas supply devices 4 are arranged at intervals along the length of both sides of the tunnel kiln 1. The kiln car 2 is located between the heating and gas supply devices 4 on both sides. The heating and gas supply devices 4 are provided with multiple first gas outlets 5, which are oriented one-to-one towards the multiple ventilation grooves 32.
[0035] In this tunnel kiln, the saggers 31 are equipped with ventilation grooves 32 that allow air to pass between the inside and outside of the saggers 31. The first air outlets 5 of the heating gas supply device 4 are aligned with the ventilation grooves 32. After heating, atmospheric gas is introduced into the heating gas supply device 4 and then output in multiple streams through the multiple first air outlets 5. Each stream of atmospheric gas is blown from the outside to the inside of the corresponding sagger 31 through the ventilation grooves 32, ensuring that the inside and outside of each sagger 31 at different heights are fully in contact with the atmospheric gas. The atmospheric gas can efficiently radiate heat to the material, improving the quality of the material production. At the same time, since the heating gas supply device 4 outputs gas through the first air outlets 5, i.e., the heating gas supply device 4 is in a positive pressure state, it can also prevent waste gas generated during the production process from entering the heating gas supply device 4, thus improving the service life of the heating gas supply device 4. The number and spacing of the first air outlets 5 are determined by the number and size of the stacked saggers 31. Specifically, the number of first air outlets 5 is equal to the number of saggers 31, and the spacing of the first air outlets 5 is the distance between the ventilation grooves 32 on two adjacent saggers 31.
[0036] Further, in this embodiment, the heating gas supply device 4 includes a heating element 41, an inlet pipe 42, and an outlet pipe 43. The outlet pipe 43 is disposed on the tunnel kiln 1, and the heating element 41 is installed inside the outlet pipe 43. One end of the inlet pipe 42 is connected to the tunnel kiln 1, and the other end is connected to the outlet pipe 43. The connection between the inlet pipe 42 and the outlet pipe 43 is located at the cold end of the heating element 41, and the hot end of the heating element 41 faces the sagger stack 3. The height of the hot end of the heating element 41 is greater than the height of the sagger stack 3. Each first outlet 5 is arranged at intervals on the outlet pipe 43. The atmospheric gas is input into the outlet pipe 43 through the inlet pipe 42, and then moves from the cold end to the hot end of the heating element 41. The hot end heats the atmospheric gas and outputs it from the first outlet 5. Preferably, the inlet pipe 42 is made of stainless steel, ceramic, or other materials that are resistant to high temperatures. The inlet pipe 42 is connected to the cold end of the heating element 41 to protect the inlet pipe 42. The heating element 41 is an electric heating element.
[0037] Furthermore, in this embodiment, the cold end of the heating element 41 is mounted on the gas outlet pipe 43 via a support member 44, and heat insulation cotton 45 is provided between the heating element 41, the gas outlet pipe 43, and the support member 44. The support member 44 facilitates the mounting of the heating element 41 on the gas outlet pipe 43, and the heat insulation cotton 45 serves to insulate heat and prevent gas leakage. Preferably, the support member 44 is a ceramic plug, which has good fire resistance and high temperature resistance.
[0038] Furthermore, in this embodiment, refractory mounting seats 6 are provided on both sides of the tunnel kiln 1. The kiln car 2 runs between the refractory mounting seats 6 on both sides and leaves a gap between them. The vent pipe 43 is installed on the refractory mounting seat 6. Multiple first air intake structures 61 are arranged at intervals along the length of the refractory mounting seat 6. The first air intake structure 61 includes multiple first air outlet channels 611 arranged at intervals. The outlet of the first air outlet channel 611 faces the kiln car 2. The kiln car 2 includes a frame 21. The bottom of the frame 21 is provided with wheels 22. The top of the frame 21 is provided with a refractory base 23. The sagger stack 3 is placed on the refractory base 23. The refractory base 23 is provided with a second air intake structure 24. The second air intake structure 24 includes a main channel 241 and a branch channel 242. The top of the main channel 241 is provided with multiple second air outlet channels 243 extending to the top surface of the refractory mounting seat 6. The outlet of the first air outlet channel 611 faces the inlet of the branch channel 242.
[0039] Taking two sets of sagger stacks 3 as an example, the main channel 241 is located between the two sets of sagger stacks 3. Multiple branch channels 242 are connected to both sides of the main channel 241. The branch channels 242 on both sides correspond one-to-one with the first air outlet channels 611 on both sides.
[0040] Each first outlet channel 611 outputs atmospheric gas. The atmospheric gas in each of the first outlet channels 611 on both sides enters the main channel 241 through the branch channels 242 on both sides. The main channel 241 outputs to the top surface through the second outlet channel 243. Since the main channel 241 is located between the two sets of sagger stacks 3, the atmospheric gas is output from between the two sets of sagger stacks 3, which further ensures that the inner side of the two sets of sagger stacks 3 is in full contact with the atmospheric gas and improves production quality.
[0041] Similarly, in other embodiments, if the sagger stack 3 has three or more sets, then a main channel 241 is provided between adjacent sagger stacks 3, and multiple branch channels 242 are connected between adjacent two main channels 241 and outside the two outermost main channels 241. The outermost branch channels 242 correspond one-to-one with the first gas outlet channels 611 on both sides. This is also to further ensure sufficient contact between the inner sagger stack 3 and the atmospheric gas. Preferably, the main channel 241 and the branch channels 242 are arranged perpendicularly, and the branch channels 242 on both sides of the main channel 241 are staggered and connected to the main channel 241, improving the flow effect of gas from the branch channels 242 to all parts of the main channel 241.
[0042] Furthermore, in this embodiment, the first air intake structure 61 also includes a main channel 612, with multiple first air outlet channels 611 located on one side of the main channel 612, and an air intake channel 613 provided on the other side of the main channel 612. Atmospheric gas enters through the air intake channel 613, converges at the main channel 612, and then exits through the multiple first air outlet channels 611. Preferably, the air intake channel 613 and the first air outlet channels 611 are staggered from the main channel 612 to improve gas flow efficiency.
[0043] Furthermore, in this embodiment, multiple third air intake structures 62 are arranged at intervals along the length of the refractory mounting base 6. These third air intake structures 62 are arranged one-to-one below multiple first air intake structures 61. The frame 21 has first protrusions 211 on both sides, and the refractory base 23 has second protrusions 231 on both sides. The tunnel kiln 1 has first grooves 11 and second grooves 12 on both sides corresponding to the first protrusions 211 and second protrusions 231. An isolation curved channel 7 is formed between the kiln car 2 and the refractory mounting base 6 through the first protrusions 211, first grooves 11, second protrusions 231, and second grooves 12. The third air intake structures 62 are used to supply air to the isolation curved channel 7, and their outlets are located between the first grooves 11 and second grooves 12. By supplying air to the isolation curved channel 7 through the third air intake structures 62, an air curtain is formed between the upper and lower spaces, preventing excessive pressure at the top of the kiln car 2 from causing hot air to flow downwards, thus protecting the frame 21 and wheels 22 for normal operation.
[0044] Furthermore, in this embodiment, multiple fourth air intake structures 63 are arranged at intervals along the length of the refractory mounting base 6. These fourth air intake structures 63 are arranged one-to-one below multiple third air intake structures 62. The fourth air intake structures 63 are used to supply air to the bottom of the kiln car 2 for cooling. This provides localized cooling to the frame 21, wheels 22, and internal bearings, ensuring the normal operation of the kiln car 2.
[0045] Furthermore, in this embodiment, the distance between two adjacent first air intake structures 61 is the single step distance of the kiln car 2. Specifically, the single step distance of the kiln car 2 is the length of one kiln car 2, which facilitates the pre-setting of the positions of the first air intake structure 61 and the heating gas delivery device 4 to ensure production efficiency.
[0046] Preferably, in this embodiment, both the third air intake structure 62 and the fourth air intake structure 63 include multiple third air outlet channels arranged at intervals along the length of the tunnel kiln 1, which is simple in structure; the bottom of the tunnel kiln 1 is provided with a guide rail 13, and the kiln car 2 moves on the guide rail 13 to ensure the movement route and guarantee the production effect.
[0047] Furthermore, in this embodiment, both the first air intake structure 61 and the third air intake structure 62 are introduced with ambient temperature gas. Since the first air intake structure 61 is relatively close to the heating gas supply device 4, it has a certain preheating effect on the atmosphere gas in the first air intake structure 61, saving the need for a heating structure. The third air intake structure 62 is relatively far from the heating gas supply device 4, which is conducive to the formation of a high-temperature isolation air curtain by the atmosphere gas output from the third air intake structure 62. The fourth air intake structure 63 introduces cooling atmosphere gas, which facilitates the cooling of the bottom of the kiln car 2.
[0048] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the present invention, or modify it into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.
Claims
1. A tunnel kiln, comprising a tunnel kiln (1) and a kiln car (2) moving along the length of the tunnel kiln (1), characterized in that: The kiln car (2) is provided with multiple sets of sagger stacks (3) formed by stacking multiple saggers (31). The multiple sets of sagger stacks (3) are arranged at intervals along the width direction of the tunnel kiln (1). Each sagger (31) is provided with a ventilation groove (32) for ventilation between the inside and outside of the sagger (31). Multiple heating gas supply devices (4) are arranged at intervals along the length direction on both sides of the tunnel kiln (1). The kiln car (2) is located between the heating gas supply devices (4) on both sides. The heating gas supply device (4) is provided with multiple first air outlets (5). The multiple first air outlets (5) are aligned one-to-one with the multiple ventilation grooves (32).
2. The tunnel kiln according to claim 1, characterized in that: The heating and gas supply device (4) includes a heating element (41), an inlet pipe (42), and an outlet pipe (43). The outlet pipe (43) is located on the tunnel kiln (1). The heating element (41) is installed inside the outlet pipe (43). One end of the inlet pipe (42) is connected to the tunnel kiln (1), and the other end is connected to the outlet pipe (43). The connection between the inlet pipe (42) and the outlet pipe (43) is located at the cold end of the heating element (41). The hot end of the heating element (41) faces the sagger stack (3), and the height of the hot end of the heating element (41) is greater than the height of the sagger stack (3). Each of the first outlets (5) is arranged at intervals on the outlet pipe (43).
3. The tunnel kiln according to claim 2, characterized in that: The cold end of the heating element (41) is mounted on the air outlet pipe (43) via a support member (44), and heat insulation cotton (45) is provided between the heating element (41), the air outlet pipe (43) and the support member (44).
4. The tunnel kiln according to claim 3, characterized in that: The support member (44) is a ceramic plug.
5. The tunnel kiln according to any one of claims 2 to 4, characterized in that: The tunnel kiln (1) is provided with refractory mounting seats (6) on both sides. The kiln car (2) runs between the refractory mounting seats (6) on both sides and leaves a gap between them. The air outlet pipe (43) is installed on the refractory mounting seat (6). Multiple first air inlet structures (61) are arranged at intervals along the length of the refractory mounting seat (6). The first air inlet structure (61) includes multiple first air outlet channels (611) arranged at intervals. The outlet of the first air outlet channel (611) faces the kiln car (2). The kiln car (2) includes a frame (2 1) The bottom of the frame (21) is provided with wheels (22), the top of the frame (21) is provided with a fire-resistant base (23), the sagger stack (3) is provided on the fire-resistant base (23), the fire-resistant base (23) is provided with a second air intake structure (24), the second air intake structure (24) includes a main channel (241) and a branch channel (242), the top of the main channel (241) is provided with a plurality of second air outlet channels (243) extending to the top surface of the fire-resistant mounting base (6), and the outlet of the first air outlet channel (611) faces the inlet of the branch channel (242); If the sagger stack (3) is provided in two sets, the main channel (241) is located between the two sets of sagger stacks (3). Multiple branch channels (242) are connected to both sides of the main channel (241). The branch channels (242) on both sides correspond one-to-one with the first air outlet channel (611) on both sides. If the sagger stack (3) has three or more sets, then each adjacent sagger stack (3) is provided with a main channel (241), and each of the two adjacent main channels (241) and the outermost two main channels (241) is connected to multiple branch channels (242). The outermost branch channels (242) correspond one-to-one with the first air outlet channels (611) on both sides.
6. The tunnel kiln according to claim 5, characterized in that: The first air intake structure (61) also includes a main channel (612), a plurality of first air outlet channels (611) are located on one side of the main channel (612), and an air intake channel (613) is provided on the other side of the main channel (612).
7. The tunnel kiln according to claim 6, characterized in that: The air intake channel (613) and the first air outlet channel (611) are connected to the main road (612) in a staggered manner, and the branch roads (242) on both sides of the main road (241) are connected to the main road (241) in a staggered manner.
8. The tunnel kiln according to claim 5, characterized in that: Multiple third air intake structures (62) are also arranged at intervals along the length of the refractory mounting base (6). The multiple third air intake structures (62) are arranged one-to-one below the multiple first air intake structures (61). The frame (21) is provided with first protrusions (211) on both sides. The refractory base (23) is provided with second protrusions (231) on both sides. The tunnel kiln (1) is provided with first grooves (11) and second grooves (12) on both sides corresponding to the first protrusions (211) and second protrusions (231). The kiln car (2) and the refractory mounting base (6) form an isolation curve channel (7) through the first protrusions (211), first grooves (11), second protrusions (231) and second grooves (12). The third air intake structure (62) is used to supply air to the isolation curve channel (7). The air outlet of the third air intake structure (62) is located between the first groove (11) and the second groove (12).
9. The tunnel kiln according to claim 8, characterized in that: Along the length of the refractory mounting base (6), a plurality of fourth air intake structures (63) are also arranged at intervals. The plurality of fourth air intake structures (63) are arranged one-to-one below the plurality of third air intake structures (62). The fourth air intake structures (63) are used to supply air to the bottom of the kiln car (2) for cooling.
10. The tunnel kiln according to claim 5, characterized in that: The distance between two adjacent first air inlet structures (61) is the single step distance of the kiln car (2), and the distance between two adjacent first air outlets (5) is the distance between two adjacent ventilation slots (32).