A tunnel kiln furnace

Abstract

The invention discloses a tunnel kiln furnace, comprising a tunnel kiln and a kiln car moving along the length direction of the tunnel kiln, the kiln car is provided with a plurality of saggers formed by stacking a plurality of saggers, the plurality of saggers are arranged at intervals along the width direction of the tunnel kiln, each of the saggers is provided with a ventilation groove for ventilating the inside and outside of the sagger, a plurality of heating gas delivery devices are arranged at intervals along the length direction on both sides of the tunnel kiln, the kiln car is located between the heating gas delivery devices on both sides, the heating gas delivery device is provided with a plurality of first gas outlets, and the plurality of the first gas outlets are directed toward the plurality of ventilation grooves in a one-to-one correspondence. The invention has the advantages of ensuring that the inside and outside of the saggers are fully in contact with the atmosphere gas and improving the quality of material production.

Description

Technical Field

[0001] The invention relates to the technical field of kilns, and in particular to a tunnel kiln. Background Art

[0002] The existing kilns used for mass production of lithium battery material sintering are mainly roller kilns and pusher kilns. The roller transportation method of the roller kiln is limited by the load of the rollers and the long transmission distance, which can easily lead to uneven bowls and even accidents such as saggers rubbing against the wall. The pusher kiln is a hydraulic propulsion method that is also limited by the transmission distance. The output is small and the production efficiency is low, which can no longer meet the growing market demand. The electric heating trolley tunnel kiln is a multi-layer sagger stacked with materials, and the kiln car carries the sagger for transportation. It has the advantages of long transmission distance, large production capacity, and low energy consumption. At the same time, compared with the gas-fired tunnel kiln, the electric heating trolley tunnel kiln can meet the high requirements of the lithium battery material sintering process such as full sealing and no combustion heating gas interference, and has gradually become the development trend of the lithium battery material sintering equipment market. However, the electric heating tunnel kiln also brings the following adverse effects:

[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 or more layers, the materials inside will not be in sufficient contact with process gases such as nitrogen, air or oxygen, which will inevitably lead to inconsistent performance between external and internal materials, reduce product quality, and even cause product performance deterioration.

[0004] 2. The tunnel kiln uses a sagger to load materials and a kiln car to carry the sagger forward. This can cause unstable air pressure, hot air to flow downward, excessive temperature at the bottom of the kiln car, burning of wheel bearings, high-temperature deformation of guide rails, and other situations where the kiln car may become stuck. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a tunnel kiln which ensures that both the inner and outer sides of the sagger are in full contact with the atmosphere gas and improves the material production quality.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A tunnel kiln furnace comprises a tunnel kiln and a kiln car moving along the length direction of the tunnel kiln, the kiln car is provided with a plurality of saggers formed by stacking a plurality of saggers, the plurality of saggers are arranged at intervals along the width direction of the tunnel kiln, each of the saggers is provided with a ventilation groove for ventilating the inside and outside of the sagger, a plurality of heating gas supply devices are arranged at intervals along the length direction on both sides of the tunnel kiln, the kiln car is located between the heating gas supply devices on both sides, the heating gas supply devices are provided with a plurality of first air outlets, and the plurality of first air outlets are correspondingly oriented toward the plurality of ventilation grooves.

[0008] As a further improvement of the above technical solution:

[0009] The heating gas delivery device includes a heating element, an air inlet pipe and an air outlet pipe, the air outlet pipe is arranged on the tunnel kiln, the heating element is installed in the air outlet pipe, one end of the air inlet pipe is connected to the tunnel kiln, and the other end is connected to the air outlet pipe, the connection between the air inlet pipe and the air 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, and each of the first air outlets is arranged on the air outlet pipe at intervals.

[0010] The cold end of the heating element is installed on the air outlet pipe through a support member, and heat insulation cotton is arranged between the heating element, the air outlet pipe and the support member.

[0011] The support member is a ceramic plug.

[0012] Both sides of the tunnel kiln are provided with refractory mounting seats, the kiln car runs between the refractory mounting seats on both sides and a gap is left between the refractory mounting seats on both sides, the air outlet pipe is installed on the refractory mounting seat, and a plurality of first air inlet structures are arranged at intervals along the length direction of the refractory mounting seat, the first air inlet structure includes a plurality of first air outlet channels arranged at intervals, and 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 sagger is stacked on the refractory base, a second air inlet structure is provided in the refractory base, the second air inlet structure includes a main road and a branch road, the top of the main road is provided with a plurality of second air outlet channels extending to the top surface of the refractory mounting seat, and the outlet of the first air outlet channel faces the entrance of the branch road;

[0013] If there are two groups of sagger stacks, the main road is located between the two groups of sagger stacks, and both sides of the main road are connected with multiple branch roads, and the branch roads on both sides correspond to the first air outlet channels on both sides one by one;

[0014] If there are three or more groups of sagger stacks, main roads are provided between adjacent sagger stacks, and multiple branch roads are connected between two adjacent main roads and outside the two outermost main roads. The outermost branch roads correspond one by one to the first air outlet channels on both sides.

[0015] The first air intake structure further includes a main trunk, a plurality of the first air outlet channels are located on one side of the main trunk, and an air intake channel is provided on the other side of the main trunk.

[0016] The air inlet channel and the first air outlet channel are staggeredly connected to the main trunk road, and the branch trunk roads on both sides of the main trunk road are staggeredly connected to the main trunk road.

[0017] A plurality of third air intake structures are arranged at intervals along the length direction of the refractory mounting seat, and the plurality of third air intake structures are arranged one-to-one below the plurality of first air intake structures. A first boss is provided on both sides of the frame, and a second boss is provided on both sides of the refractory base. A first groove and a second groove corresponding to the first boss and the second boss are provided on both sides of the tunnel kiln. An isolation curved channel is formed between the kiln car and the refractory mounting seat through the first boss, the first groove, the second boss and the second groove. The third air intake structure is used to supply air to the isolation curved channel, and an air outlet of the third air intake structure is located between the first groove and the second groove.

[0018] A plurality of fourth air intake structures are arranged at intervals along the length direction of the refractory mounting seat. The plurality of fourth air intake structures are arranged one-to-one below the plurality of third air intake structures. The fourth air intake structures are used to supply air to cool the bottom of the kiln car.

[0019] The distance between two adjacent first air inlet structures is the single stepping distance of the kiln car, and the distance between two adjacent first air outlets is the distance between two adjacent ventilation grooves.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] The tunnel kiln disclosed in the present invention has a kiln with ventilation grooves on the sagger for ventilation of the inside and outside of the sagger, and the first air outlets of the heating gas delivery device are oriented toward the ventilation grooves in a one-to-one correspondence. Atmosphere gas is introduced into the heating gas delivery device for heating and then output in multiple streams through multiple first air outlets. Each stream of atmosphere gas is blown from the outside to the inside of the corresponding sagger via the ventilation grooves, so that the inside and outside of each sagger at different heights can fully contact the atmosphere gas, and the atmosphere gas can efficiently radiate heat to the material, thereby improving the material production quality. At the same time, since the heating gas delivery device exhausts gas through the first air outlet, that is, the heating gas delivery device is in a positive pressure state, it can also prevent waste gas generated in the production process from entering the heating gas delivery device, thereby improving the service life of the heating gas delivery device.

[0022] Furthermore, in the tunnel kiln disclosed in the present invention, each first gas outlet channel outputs atmosphere gas respectively, and the atmosphere gas in each first gas outlet channel on both sides enters the main road through the branch roads on both sides respectively, and the main road outputs to the top surface through the second gas outlet channel. The main road is located between the two groups of sagger stacks, so the atmosphere gas is output from between the two groups of sagger stacks, further ensuring that the inner sides of the two groups of sagger stacks are fully in contact with the atmosphere gas, thereby improving the production quality.

[0023] Furthermore, the tunnel kiln disclosed in the present invention supplies air to the isolation curved channel through the third air intake structure to form an air curtain that separates the upper and lower spaces, thereby preventing excessive pressure on the top of the kiln car from causing hot air to flow downward, thereby protecting the normal operation of the frame and wheels.

[0024] Furthermore, in the tunnel kiln disclosed in the present invention, the fourth air intake structure is used to supply air to cool the bottom of the kiln car, locally cool the frame, wheels and internal bearings, and ensure the normal operation of the kiln car. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the main cross-sectional structure of the tunnel kiln of the present invention.

[0026] Figure 2 It is a schematic structural diagram of an air outlet pipe in a tunnel kiln of the present invention.

[0027] Figure 3 It is a schematic cross-sectional structure diagram of the first air intake structure and the second air intake structure in the tunnel kiln of the present invention.

[0028] Figure 4 It is a side view cross-sectional structural schematic diagram (single section) of the tunnel kiln of the present invention.

[0029] The numbers in the figure represent: 1. tunnel kiln; 11. first groove; 12. second groove; 13. guide rail; 2. kiln car; 21. frame; 211. first boss; 22. wheel; 23. refractory base; 231. second boss; 24. second air intake structure; 241. main road; 242. branch road; 243. second air outlet channel; 3. sagger stack; 31. sagger; 32. ventilation groove; 4. heating gas transmission device; 41. heating element; 42. air inlet pipe; 43. air outlet pipe; 44. support member; 45. thermal insulation cotton; 5. first air outlet; 6. refractory mounting seat; 61. first air intake structure; 611. first air outlet channel; 612. main road; 613. air intake channel; 62. third air intake structure; 63. fourth air intake structure; 7. isolation curve channel. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "assemble", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Figures 1 to 4 An embodiment of a tunnel kiln of the present invention is shown. The tunnel kiln of this embodiment comprises a tunnel kiln 1 and a kiln car 2 moving along the length direction of the tunnel kiln 1. The kiln car 2 is provided with a plurality of saggers 3 formed by stacking a plurality of saggers 31. The plurality of saggers 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 ventilating the inside and outside of the sagger 31. A plurality of heating gas delivery devices 4 are arranged at intervals on both sides of the tunnel kiln 1 along the length direction. The kiln car 2 is located between the heating gas delivery devices 4 on both sides. The heating gas delivery device 4 is provided with a plurality of first air outlets 5. The plurality of first air outlets 5 are oriented toward the plurality of ventilation grooves 32 in a one-to-one correspondence.

[0035] The tunnel kiln furnace has ventilation grooves 32 on the sagger 31 for ventilation inside and outside the sagger 31, and the first air outlets 5 of the heating gas delivery device 4 are oriented toward the ventilation grooves 32 in a one-to-one correspondence. The atmosphere gas is introduced into the heating gas delivery device 4 for heating and then output through multiple first air outlets 5. Each air outlet blows from the outside of the corresponding sagger 31 to the inside through the ventilation grooves 32, so that the inside and outside of each sagger 31 at different heights can fully contact the atmosphere gas, and the atmosphere gas can efficiently radiate heat to the material, thereby improving the material production quality. At the same time, since the heating gas delivery device 4 exhausts gas through the first air outlet 5, that is, the heating gas delivery device 4 is in a positive pressure state, it can also prevent the waste gas generated in the production process from entering the heating gas delivery device 4, thereby improving the service life of the heating gas delivery device 4. The number and spacing of the first air outlets 5 are determined by the number and size of the overlapping saggers 31. Specifically, the number of the 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 delivery device 4 includes a heating element 41, an air inlet pipe 42 and an air outlet pipe 43. The air outlet pipe 43 is arranged on the tunnel kiln 1. The heating element 41 is installed in the air outlet pipe 43. One end of the air inlet pipe 42 is connected to the tunnel kiln 1, and the other end is connected to the air outlet pipe 43. The connection between the air inlet pipe 42 and the air 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 first air outlet 5 is arranged at intervals on the air outlet pipe 43. The atmosphere gas is input into the air outlet pipe 43 from the air inlet pipe 42, and then moves from the cold end of the heating element 41 to the hot end. The hot end heats the atmosphere gas and then outputs it from the first air outlet 5. Preferably, the air inlet pipe 42 is made of stainless steel, ceramics and other materials, which are resistant to high temperatures. The air inlet pipe 42 is connected to the cold end of the heating element 41, which is conducive to protecting the air 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 installed on the outlet pipe 43 through the support 44, and a heat insulation cotton 45 is provided between the heating element 41, the outlet pipe 43 and the support 44. The support 44 facilitates the installation of the heating element 41 on the outlet pipe 43, and the heat insulation cotton 45 plays the role of heat insulation and preventing gas from overflowing. Preferably, the support 44 is a ceramic plug with good fire resistance and high temperature resistance.

[0038] Further, in the present embodiment, both sides of the tunnel kiln 1 are provided with refractory mounting seats 6, the kiln car 2 runs between the refractory mounting seats 6 on both sides and leaves a gap between the refractory mounting seats 6 on both sides, the air outlet pipe 43 is installed on the refractory mounting seats 6, and a plurality of first air inlet structures 61 are arranged at intervals along the length direction of the refractory mounting seats 6, the first air inlet structure 61 includes a plurality of 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, a wheel 22 is provided at the bottom of the frame 21, a refractory base 23 is provided at the top of the frame 21, the sagger stack 3 is provided on the refractory base 23, a second air inlet structure 24 is provided in the refractory base 23, the second air inlet structure 24 includes a main road 241 and a branch road 242, a plurality of second air outlet channels 243 extending to the top surface of the refractory mounting seats 6 are provided at the top of the main road 241, and the outlet of the first air outlet channel 611 faces the entrance of the branch road 242;

[0039] Taking two groups of sagger stacks 3 as an example, the main road 241 is located between the two groups of sagger stacks 3, and both sides of the main road 241 are connected to multiple branch roads 242, and the branch roads 242 on both sides correspond to the first air outlet channels 611 on both sides.

[0040] Each first gas outlet channel 611 outputs atmosphere gas respectively. The atmosphere gas in each first gas outlet channel 611 on both sides enters the main channel 241 through the branch channels 242 on both sides respectively. The main channel 241 outputs to the top surface through the second gas outlet channel 243. The main channel 241 is located between the two groups of sagger stacks 3, so the atmosphere gas is output from between the two groups of sagger stacks 3, further ensuring that the inner sides of the two groups of sagger stacks 3 are fully in contact with the atmosphere gas, thereby improving the production quality.

[0041] Similarly, in other embodiments, if there are three or more groups of sagger stacks 3, main roads 241 are provided between adjacent sagger stacks 3, and multiple branch roads 242 are connected between two adjacent main roads 241 and outside the two outermost main roads 241, and the outermost branch roads 242 correspond to the first gas outlet channels 611 on both sides. It is also to further ensure that the inner sagger stack 3 is in full contact with the atmosphere gas. Preferably, the main road 241 and the branch roads 242 are arranged vertically, and the branch roads 242 on both sides of the main road 241 are staggered and connected to the main road 241, so as to improve the flow effect of gas from the branch roads 242 to various parts of the main road 241.

[0042] Furthermore, in this embodiment, the first air inlet structure 61 further 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 inlet channel 613 is provided on the other side of the main channel 612. The atmosphere gas enters from the air inlet channel 613, is collected in the main channel 612, and is then diverted and output from the plurality of first air outlet channels 611. Preferably, the air inlet channel 613 and the first air outlet channels 611 are staggered and connected to the main channel 612 to improve the gas circulation effect.

[0043] Furthermore, in this embodiment, a plurality of third air intake structures 62 are arranged at intervals along the length direction of the refractory mounting seat 6, and the plurality of third air intake structures 62 are arranged one by one below the plurality of first air intake structures 61, a first boss 211 is provided on both sides of the frame 21, a second boss 231 is provided on both sides of the refractory base 23, and a first groove 11 and a second groove 12 corresponding to the first boss 211 and the second boss 231 are provided on both sides of the tunnel kiln 1, and an isolation curve channel 7 is formed between the kiln car 2 and the refractory mounting seat 6 through the first boss 211, the first groove 11, the second boss 231 and the second groove 12, and the third air intake structure 62 is used to supply air to the isolation curve channel 7, and the air outlet of the third air intake structure 62 is located between the first groove 11 and the second groove 12. Air is supplied to the isolation curve channel 7 through the third air intake structure 62, forming an air curtain separating the upper and lower spaces, preventing the pressure on the top of the kiln car 2 from being too high, causing the hot air flow to flow downward, and protecting the normal operation of the frame 21 and the wheels 22.

[0044] Furthermore, in this embodiment, a plurality of fourth air intake structures 63 are arranged at intervals along the length direction of the refractory mounting seat 6, and the plurality of fourth air intake structures 63 are arranged one by one below the plurality of third air intake structures 62, and the fourth air intake structures 63 are used to supply air to cool the bottom of the kiln car 2. The frame 21, wheels 22 and internal bearings are locally cooled to ensure 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 stepping distance of the kiln car 2. Specifically, the single stepping distance of the kiln car 2 is the length of one kiln car 2, which is convenient for presetting the positions of the first air intake structure 61 and the heating gas delivery device 4 in advance to ensure the production effect.

[0046] Preferably, in this embodiment, the third air intake structure 62 and the fourth air intake structure 63 both include a plurality of third air outlet channels spaced apart along the length direction of the tunnel kiln 1, and have a simple structure; a guide rail 13 is provided at the bottom of the tunnel kiln 1, and the kiln car 2 moves on the guide rail 13 to ensure the moving route and the production effect.

[0047] Furthermore, in the present embodiment, both the first air intake structure 61 and the third air intake structure 62 are introduced with ambient temperature atmosphere gas. Since the first air intake structure 61 is relatively close to the heating gas delivery device 4, it has a certain preheating effect on the atmosphere gas in the first air intake structure 61, thus saving the setting of the heating structure. The third air intake structure 62 is relatively far from the heating gas delivery device 4, which is beneficial for the atmosphere gas output by the third air intake structure 62 to form a high-temperature partition air curtain. The fourth air intake structure 63 is introduced with cooling atmosphere gas, which is convenient for cooling the bottom of the kiln car 2.

[0048] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A tunnel kiln furnace, comprising a tunnel kiln (1) and a kiln car (2) moving along the length direction of the tunnel kiln (1), characterized in that: The kiln car (2) is provided with a plurality of sagger stacks (3) formed by stacking a plurality of saggers (31), the plurality of sagger stacks (3) being arranged at intervals along the width direction of the tunnel kiln (1), each of the saggers (31) being provided with a ventilation groove (32) for ventilating the inside and outside of the sagger (31), a plurality of heating gas supply devices (4) being arranged at intervals along the length direction on both sides of the tunnel kiln (1), the kiln car (2) being located between the heating gas supply devices (4) on both sides, the heating gas supply devices (4) being provided with a plurality of first gas outlets (5), the plurality of first gas outlets (5) being directed toward the plurality of ventilation grooves (32) in a one-to-one correspondence.

2. The tunnel kiln according to claim 1, characterized in that: The heating gas delivery device (4) comprises a heating element (41), an air inlet pipe (42) and an air outlet pipe (43); the air outlet pipe (43) is arranged on the tunnel kiln (1); the heating element (41) is installed in the air outlet pipe (43); one end of the air inlet pipe (42) is connected to the tunnel kiln (1), and the other end is connected to the air outlet pipe (43); the connection between the air inlet pipe (42) and the air 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); the height of the hot end of the heating element (41) is greater than the height of the sagger stack (3); and each of the first air outlets (5) is arranged on the air outlet pipe (43) at intervals.

3. The tunnel kiln according to claim 2, characterized in that: The cold end of the heating element (41) is installed on the air outlet pipe (43) through 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: Both sides of the tunnel kiln (1) are provided with refractory mounting seats (6); the kiln car (2) runs between the refractory mounting seats (6) on both sides and a gap is left between the refractory mounting seats (6) on both sides; the air outlet pipe (43) is installed on the refractory mounting seats (6); a plurality of first air intake structures (61) are arranged at intervals along the length direction of the refractory mounting seats (6); the first air intake structures (61) include a plurality of first air outlet channels (611) arranged at intervals; the outlets of the first air outlet channels (611) face the kiln car (2); the kiln car (2) includes a car frame (2 1), a wheel (22) is provided at the bottom of the vehicle frame (21), a refractory base (23) is provided at the top of the vehicle frame (21), the sagger stack (3) is arranged on the refractory base (23), a second air intake structure (24) is provided in the refractory base (23), the second air intake structure (24) comprises a main road (241) and a branch road (242), a plurality of second air outlet channels (243) extending to the top surface of the refractory mounting seat (6) are provided at the top of the main road (241), and the outlet of the first air outlet channel (611) faces the inlet of the branch road (242); If there are two groups of the sagger stacks (3), the main road (241) is located between the two groups of the sagger stacks (3), and both sides of the main road (241) are connected with a plurality of branch roads (242), and the branch roads (242) on both sides correspond to the first air outlet channels (611) on both sides one by one; If there are three or more groups of the sagger stacks (3), main roads (241) are provided between adjacent sagger stacks (3), and a plurality of branch roads (242) are connected between two adjacent main roads (241) and outside the two outermost main roads (241), and the outermost branch roads (242) correspond one by one to 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) further comprises a main channel (612), a plurality of the 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 inlet channel (613) and the first air outlet channel (611) are staggeredly connected to the main trunk road (612), and the branch trunk roads (242) on both sides of the main trunk road (241) are staggeredly connected to the main trunk road (241).

8. The tunnel kiln according to claim 5, characterized in that: A plurality of third air intake structures (62) are arranged at intervals along the length direction of the refractory mounting seat (6); the plurality of third air intake structures (62) are arranged one by one below the plurality of first air intake structures (61); first bosses (211) are arranged on both sides of the frame (21); second bosses (231) are arranged on both sides of the refractory base (23); first grooves (11) and second grooves (12) corresponding to the first bosses (211) and the second bosses (231) are arranged on both sides of the tunnel kiln (1); an isolation curved channel (7) is formed between the kiln car (2) and the refractory mounting seat (6) through the first boss (211), the first groove (11), the second boss (231) and the second groove (12); the third air intake structures (62) are used to supply air to the isolation curved channel (7); and an 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: A plurality of fourth air intake structures (63) are arranged at intervals along the length direction of the refractory mounting seat (6), and the plurality of fourth air intake structures (63) are arranged one by 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 distance of a single step of the kiln car (2), and the distance between two adjacent first air outlets (5) is the distance between two adjacent ventilation grooves (32).

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