A cooling section structure of a kiln for producing microcrystalline ceramic tiles

Abstract

The application discloses a cooling section structure of a kiln for producing microcrystalline ceramic tiles and relates to the technical field of kiln equipment. The cooling section structure comprises a roller kiln cooling section, a cooling unit is arranged in the cooling section, the cooling unit is composed of transverse cooling pipes, the transverse cooling pipes are arranged in a horizontal direction and are arranged in parallel, the transverse cooling pipes penetrate through the front end and the rear end of the cooling section of the roller kiln, the front end of the cooling section is connected with a main air pipe, the rear end of the cooling pipe is connected with a secondary air pipe, an air induction fan is connected with the secondary air pipe, and the main air pipe is connected with a waste heat flue gas pipe of a roller kiln firing section. Through the arrangement of the upper and lower two layers of cooling pipes in the roller kiln cooling section along the roller plane direction, the heat transfer effect is strengthened, there is no air flow disturbance, and the crystallization of the microcrystalline ceramic tile in the cooling section is more smooth and smooth.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of kiln equipment, in particular to a cooling section structure of a kiln for producing microcrystalline ceramic tiles. BACKGROUND

[0002] Microcrystalline glass ceramic composite board (also known as microcrystalline stone ceramic) is a high-tech product that combines a layer of microcrystalline glass on the surface of a ceramic vitrified tile substrate and is completely integrated after secondary sintering. In simple terms, the biggest difference between microcrystalline stone and other ceramic tile products is that there is an additional layer of microcrystalline glass on the surface. The surface is transparent and shiny, with a full light sense, and the brightness can be compared with a mirror. The texture has a flowing and changing sense, and the lines give a natural and harmonious beauty. Touching the surface with your hand is as warm and smooth as jade. It is used for indoor tile paving to improve the indoor decoration effect.

[0003] Microcrystalline glass ceramic production requires higher sintering temperatures, and the temperature of a microcrystalline kiln is higher than that of an ordinary ceramic kiln. However, in the cooling section of the microcrystalline kiln, sufficient residence time and precise constant temperature are required to achieve internal crystal phase balance. How to provide a relatively uniform internal environment temperature in the cooling section of the microcrystalline kiln to balance the internal crystal phase is a difficult problem facing microcrystalline ceramic manufacturers.

[0004] Chinese patent publication No. CN110500891A discloses a tunnel kiln circulating cooling system, which discloses a cooling system structure of a kiln. The technical solution sets multiple slow cooling zones in the kiln to achieve uniform cooling, and each slow cooling zone is provided with a circulating fan for air blowing and cooling. However, the multiple partition settings in the kiln interior can easily form a temperature gradient, which is not conducive to gradual cooling and is not conducive to the formation of the crystal phase of microcrystalline ceramic. Secondly, the use of air blowing to adjust the temperature of the slow cooling zone can cause air flow disturbance in the kiln, and dust and impurities can be carried to the surface of the ceramic tile with the cold air, which can affect the crystallization flatness of the microcrystalline ceramic tile. In addition, the use of multiple circulating fans can increase the energy consumption of the kiln and increase the equipment maintenance cost. SUMMARY

[0005] In view of the above, the present application aims to solve the problems of uniform cooling and energy saving of the kiln for producing microcrystalline ceramic tiles.

[0006] To achieve the above object, the present application adopts the following technical scheme: a cooling section structure of a kiln for producing microcrystalline ceramic tiles, comprising a roller kiln cooling section, a cooling unit is arranged inside the cooling section, the cooling unit is composed of transverse cooling pipes, the transverse cooling pipes are arranged in parallel along the horizontal direction, the transverse cooling pipes penetrate through the front end and the rear end of the cooling section of the roller kiln, the front end of the transverse cooling pipe is connected to a main air pipe, the rear end of the transverse cooling pipe is connected to a secondary air pipe, the secondary air pipe is connected with an air induction fan, and the main air pipe is connected with a waste heat flue gas pipe of a roller kiln firing section.

[0007] Preferably, the transverse cooling pipes in the cooling unit comprise upper cooling pipes and lower cooling pipes, the upper cooling pipes are arranged above the roller in the horizontal direction, the lower cooling pipes are arranged below the roller in the horizontal direction, the upper cooling pipes are located in the space between the roller and the top of the inner wall of the cooling section, the upper cooling pipes do not contact the top of the inner wall of the cooling section or the roller, and the space angle between the upper cooling pipes and the roller is 90 degrees; the lower cooling pipes are arranged below the roller in the horizontal direction, have a spacing from the roller and do not directly contact the roller, and the space angle between the lower cooling pipes and the roller is 90 degrees; and the lower cooling pipes do not contact the bottom of the inner wall of the cooling section of the roller kiln.

[0008] Preferably, the front end of the main air pipe is connected to an air inlet pipe, and the end of the main air pipe is connected to the upper cooling pipes through a main air groove, and the air inlet pipe is connected with the waste heat flue gas pipe of the roller kiln firing section.

[0009] Preferably, the main air pipe is provided with an air distribution port, and the air distribution port is provided with an air distribution butterfly valve.

[0010] Preferably, the main air pipe is arranged as a ring-shaped pipe, which surrounds the front end of the roller kiln cooling section, and the ring-shaped pipe is perpendicular to the horizontal plane of the roller, wherein the ring-shaped pipe is divided into an upper ring pipe, a lower ring pipe, a left ring pipe and a right ring pipe, and the four ring pipes are arranged in a ring shape, the upper ring pipe is arranged above the outside of the roller kiln cooling section, the lower ring pipe penetrates into the inside of the front end of the roller kiln cooling section, the left ring pipe is arranged on the left side of the outside of the roller kiln cooling section, and the right ring pipe is arranged on the right side of the outside of the roller kiln cooling section.

[0011] Preferably, the upper ring pipe of the main air pipe is connected with a main air groove, the main air groove is rectangular, one end of the main air groove is connected with the upper ring pipe of the main air pipe, the other end of the main air groove extends vertically into the inside of the roller kiln cooling section, and the main air groove is uniformly provided with openings in the horizontal direction at the position in the inside of the roller kiln, the size of the openings is consistent with the outer diameter of the upper cooling pipes, and the front end of the upper cooling pipes is inserted into the holes in the inside of the main air groove; the connection between the main air groove and the upper cooling pipes is fixedly installed by full welding; the lower ring pipe is uniformly provided with openings at the inside of the roller kiln, and the size of the openings is consistent with the outer diameter of the lower cooling pipes; and the connection between the lower ring pipe and the lower cooling pipes is fixedly installed by full welding.

[0012] Preferably, the first valve is arranged at the connection between the main air pipe and the upper ring pipe, and the second valve is arranged at the connection between the main air pipe and the left ring pipe.

[0013] Preferably, the secondary air pipe is divided into a first secondary air pipe and a second secondary air pipe, the first secondary air pipe is arranged above the rear end of the cooling section of the roller kiln, the second secondary air pipe is arranged below the rear end of the cooling section of the roller kiln, and the first secondary air pipe and the second secondary air pipe are parallel to the roller; the air induction fan comprises a first air induction fan and a second air induction fan; the outlet end of the first secondary air pipe is connected to the inlet of the first air induction fan, and the outlet end of the second secondary air pipe is connected to the inlet of the second air induction fan.

[0014] Preferably, the first secondary air pipe is connected to the first secondary air channel through an air distribution pipeline, the first secondary air channel extends from the top of the roller kiln to above the horizontal plane of the roller inside the roller kiln, the second secondary air pipe is connected to the second secondary air channel through an air distribution pipeline, the second secondary air channel extends from the bottom of the roller kiln to below the horizontal plane of the roller inside the roller kiln, and the first secondary air channel and the second secondary air channel are provided with openings in the roller kiln, the size of the openings is consistent with the outer diameter of the transverse cooling pipe.

[0015] Preferably, a screen is arranged in the main air channel, screens are arranged in the left ring pipe and the right ring pipe, the screens are detachably arranged by using flanges, and the pore size of the screens is smaller than the inner diameter of the transverse cooling pipe.

[0016] Compared with the prior art, the present application has obvious advantages and beneficial effects, and specifically, the above technical solution can know that:

[0017] By arranging two layers of cooling pipes in the cooling section of the roller kiln in the direction of the roller plane, the heat transfer effect is strengthened, and there is no air flow disturbance, so that the crystalline phase of the microcrystalline ceramic tile in the cooling section is more flat and smooth.

[0018] The uniform cooling pipes are laid in the cooling section of the roller kiln, the temperature in the kiln is uniform, and there is no large temperature gradient, so that the product cooling rate in the cooling section of the roller kiln is gentle.

[0019] The first valve and the second valve on the main air pipe are jointly adjusted with the air distribution butterfly valve, so as to adjust the air flow temperature in the cooling pipe and adjust the temperature of the cooling section of the roller kiln.

[0020] The two air induction fans are independently arranged, so as to independently control the temperature of the upper and lower layers of the roller in the cooling section, and effectively adjust the upper and lower layer temperatures to adapt to different product production conditions. DRAWINGS

[0021] Figure 1 is the overall schematic view of the cooling section of the roller kiln of the embodiment of the present application.

[0022] Figure 2This is a cross-sectional view of point A at the front end of the cooling section of the roller kiln in an embodiment of the present invention;

[0023] Figure 3 This is a cross-sectional view of point B at the rear end of the cooling section of the roller kiln in an embodiment of the present invention;

[0024] Figure 4 This is an enlarged schematic diagram of the first duct in an embodiment of the present invention;

[0025] Figure 5 This is a partially enlarged schematic diagram of the upper ring tube in an embodiment of the present invention;

[0026] Figure 6 This is a front view of the horizontal cooling pipe according to an embodiment of the present invention;

[0027] Figure 7 This is a left view of the horizontal cooling pipe according to an embodiment of the present invention.

[0028] Figure label:

[0029] 1. Horizontal cooling pipe; 11. Air outlet; 12. Air butterfly valve; 13. Upper cooling pipe; 14. Lower cooling pipe;

[0030] 2. Roller conveyor;

[0031] 3. Main air duct; 31. Upper ring duct; 32. Lower ring duct; 33. Left ring duct; 34. Right ring duct; 35. First valve; 36. Second valve;

[0032] 4. Secondary air duct; 41. First secondary air duct; 42. Secondary air duct; 43. First secondary air slot; 44. Secondary air slot; 45. Air distribution duct;

[0033] 5. Exhaust fan; 51. First exhaust fan; 52. Second exhaust fan;

[0034] 6. Main air duct; 61. Screen. Detailed Implementation

[0035] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0036] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0037] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0038] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0039] Please refer to Figure 1 As shown in the drawings, the present application provides a cooling section structure of a microcrystalline ceramic tile kiln, which comprises a roller kiln cooling section, a thermometer for measuring the internal temperature of the kiln is installed in the roller kiln cooling section. A cooling unit is arranged inside the roller kiln cooling section, which is composed of a horizontal cooling pipe 1, which is arranged in parallel along the horizontal direction, and the horizontal cooling pipe 1 is parallel to the running direction of the roller 2 of the roller kiln, and the horizontal cooling pipe 1 penetrates the front end and the rear end of the roller kiln cooling section, and the horizontal cooling pipe 1 is located inside the roller kiln, and the front end of the horizontal cooling pipe 1 is connected to the main air pipe 3, and the rear end of the horizontal cooling pipe 1 is connected to the auxiliary air pipe 4, and the auxiliary air pipe 4 is connected with an induced draft fan 5, and the main air pipe 3 is connected with the waste heat flue gas pipe of the firing section of the roller kiln, and the main air pipe 3 has an air adjusting port 11.

[0040] In the above technical solution, a cooling unit is arranged inside the cooling section of the roller kiln, which is composed of a hollow horizontal cooling pipe 1, which is arranged horizontally and parallel to the running direction of the roller kiln. The induced draft fan 5 provides suction, so that the airflow in the horizontal cooling pipe 1 exchanges heat with the inside of the roller kiln through the horizontal cooling pipe 1, thereby reducing the temperature inside the roller kiln.

[0041] In order to avoid the initial temperature of the cooling section being too low and the temperature difference between the cooling section and the firing section of the roller kiln being too large at the initial stage of the roller kiln, one end of the transverse cooling pipe 1 is connected to the main air pipe 3 to introduce the waste heat flue gas of the firing section of the roller kiln, and meanwhile, the main air pipe 3 is provided with air distribution ports 11, and the air distribution ports 11 are evenly distributed, and the air distribution ports 11 inhale the cold air in the environment to adjust the temperature of the airflow in the cooling pipe, so as to adjust the temperature of the cooling section of the roller kiln. The power source of the airflow in the cooling pipe comes from the induced draft fan 5 connected to the auxiliary air pipe 4, and the suction force of the induced draft fan 5 inhales the waste heat flue gas in the main air pipe 3 into the transverse cooling pipe 1. The air distribution port 11 is provided with an air distribution butterfly valve 12, which is used to adjust the opening degree of the air distribution port to adjust the flow rate of the cold air entering. By reducing the opening degree of the air distribution port, the temperature of the cooling section of the roller kiln at the initial stage of the roller kiln can be rapidly increased, and by increasing the opening degree of the air distribution butterfly valve 12, the temperature of the cooling section of the roller kiln can be reduced. Through the above-mentioned indirect heat transfer, the purpose of adjusting the temperature of the cooling section can be achieved. Specifically, the air distribution ports 11 are evenly arranged on the main air pipe 3, and the air distribution butterfly valves 12 are arranged on each air distribution port 11. The inlet end of the air distribution port 11 is provided with a filter screen, and the pore size of the filter screen is smaller than the pipe diameter of the transverse cooling pipe 1, so as to prevent foreign matters from being sucked into the transverse cooling pipe 1 to cause the transverse cooling pipe 1 to be blocked. The filter screen is arranged in a detachable manner, and specifically, the filter screen is connected to the inlet end of the air distribution port 11 in a flange connection or buckle connection manner.

[0042] In the first embodiment, the transverse cooling pipe 1 in the cooling unit includes an upper cooling pipe 13 and a lower cooling pipe 14 according to the distribution area. The upper cooling pipe 13 is arranged above the roller 2 in the horizontal direction, and the lower cooling pipe 14 is arranged below the roller 2 in the horizontal direction. The upper cooling pipe 13 is located in the space between the roller 2 and the top of the inner wall of the cooling section, and the upper cooling pipe 13 does not contact the top of the inner wall of the cooling section and does not contact the roller 2. The upper cooling pipe 13 is used to cool and adjust the temperature of the area above the roller 2, and the upper cooling pipe 13 is arranged in a plurality of horizontal and side-by-side pipes. The space angle between the upper cooling pipe 13 and the roller is 90 degrees. The lower cooling pipe 14 is arranged below the roller 2 in the horizontal direction, and the space angle between the lower cooling pipe 14 and the roller 2 is 90 degrees. The lower cooling pipe 14 does not contact the bottom of the inner wall of the cooling section of the roller kiln. The lower cooling pipe 14 is used to cool and adjust the temperature of the area below the roller 2,

[0043] The front end of the transverse cooling pipe 1 is connected to the main air pipe 3, and the rear end of the transverse cooling pipe 1 is connected to the auxiliary air pipe 4. The cooling air enters the transverse cooling pipe 1 from the main air pipe 3 and then flows out from the auxiliary air pipe 4.

[0044] The air inlet pipe is connected to the waste heat flue gas pipe of the firing section of the roller kiln to provide hot air for the main air pipe 3.

[0045] Referring to Figure 2As shown, the main air pipe 3 is arranged as a ring pipe, which surrounds the front end of the roller kiln cooling section. The ring pipe is perpendicular to the horizontal plane of the roller 2, and is divided into an upper ring pipe 31, a lower ring pipe 32, a left ring pipe 33 and a right ring pipe 34. The upper ring pipe 31 is arranged above the roller kiln cooling section, the lower ring pipe 32 penetrates into the interior of the front end of the roller kiln cooling section, the left ring pipe 33 is arranged on the left side of the roller kiln cooling section, and the right ring pipe 34 is arranged on the right side of the roller kiln cooling section. The upper ring pipe 31 of the main air pipe 3 is connected with a rectangular main air slot 6. One end of the main air slot 6 is connected with the upper ring pipe 31 of the main air pipe 3, and the airflow in the upper ring pipe 31 of the main air pipe 3 can enter the main air slot 6. The other end of the main air slot 6 extends into the interior of the roller kiln cooling section. The main air slot 6 is closed in the roller kiln, and the airflow in the air slot cannot enter the roller kiln cooling section. The air slot is evenly provided with openings in the roller kiln. The size of the openings is consistent with the outer diameter of the horizontal cooling pipe 1. The front end of the upper cooling pipe 13 is inserted into the hole in the air slot and is fixedly installed by welding. The rear end of the upper cooling pipe 13 is connected with the auxiliary air pipe 4. The front end of the main air pipe 3 is connected with an air inlet pipe. The rear end of the main air pipe 3 is connected with the upper cooling pipe 13 through the main air slot 6. Hot air flows into the upper cooling pipe 13 above the plane of the roller 2 through the air inlet pipe, the main air pipe 3 and the main air slot 6. Below the plane of the roller 2, the lower ring pipe 32 penetrates into the interior of the roller kiln. The lower ring pipe 32 is evenly provided with openings in the interior of the roller kiln. The size of the openings is consistent with the outer diameter of the lower cooling pipe 14. The front end of the lower cooling pipe 14 is inserted into the opening of the lower ring pipe 32 and is fixedly sealed by welding. The rear end of the lower cooling pipe 14 is connected with the auxiliary air pipe 4. The front end of the horizontal cooling pipe 1 is fixedly installed by full welding.

[0046] The upper ring pipe 31 is evenly provided with air distribution openings 11. Each air distribution opening 11 is provided with an air distribution butterfly valve 12. The air distribution opening 11 is provided with a filter screen at the inlet end. The pore size of the filter screen is smaller than the pipe diameter of the horizontal cooling pipe 1, so as to prevent foreign matters from being sucked into the horizontal cooling pipe 1 and causing the horizontal cooling pipe 1 to be blocked. The opening degree of the air distribution butterfly valve 12 is adjusted, so as to adjust the amount of cold air entering the upper ring pipe 31, and to adjust the temperature of the airflow in the horizontal cooling pipe 1.

[0047] The left ring pipe 33 and the right ring pipe 34 of the main air pipe 3 are provided with air distribution openings 11 and air distribution butterfly valves 12. The air distribution butterfly valves 12 on the left ring pipe and the right ring pipe are opened, so as to adjust the temperature of the space below the plane of the roller 2 of the roller kiln.

[0048] The connection position of the main air pipe 3 and the upper ring pipe 31 is provided with a first valve 35. The connection position of the main air pipe 3 and the left ring pipe 33 is provided with a second valve 36. The opening degrees among the first valve 35, the second valve 36 and the air distribution butterfly valves 12 are adjusted, so as to adjust the cold and hot air ratio of the upper cooling pipe 13 and the lower cooling pipe 14, and to adjust the temperature distribution of the upper and lower spaces of the roller 2 of the roller kiln.

[0049] Referring toFigure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown in the drawings, the secondary air pipe 4 is divided into a first secondary air pipe 41 and a second secondary air pipe 42, the first secondary air pipe 41 is arranged above the rear end of the roller kiln cooling section, and the second secondary air pipe 42 is arranged below the rear end of the cooling section. The first secondary air pipe 41 and the second secondary air pipe 42 are parallel to the roller 2.

[0050] The first secondary air pipe 41 is connected with the first secondary air slot 43 through the air distribution pipe 45, the first secondary air slot 43 extends from the top of the roller kiln to above the horizontal plane of the roller 2 inside the roller kiln, so that there is a space between the bottom of the first secondary air slot 43 and the plane formed by the roller 2, which is sufficient for the microcrystalline ceramic tiles to be cooled to pass through during the transportation process of the roller 2. The second secondary air pipe 42 is connected with the second secondary air slot 44 through the air distribution pipe, and the second secondary air slot 44 extends from the bottom of the roller kiln to below the horizontal plane of the roller 2 inside the roller kiln; the first secondary air slot 43 and the second secondary air slot 44 are evenly provided with openings in the roller kiln, and the size of the openings is consistent with the outer diameter of the transverse cooling pipe 1. Preferably, the transverse cooling pipe can adopt a square tube or a circular tube, and the outer diameter of the transverse cooling pipe 1 is 40-60mm. The opening size of the first secondary air slot 43 is consistent with the outer diameter of the upper cooling pipe 13, and the opening size of the second secondary air slot 44 is consistent with the outer diameter of the lower cooling pipe 14. The opening size of the first secondary air slot and the second secondary air slot is slightly larger than the outer size of the transverse cooling pipe by 2-3mm, so that the transverse cooling pipe is easy to install during installation, and after installation is completed, the cooling pipe is fixed and sealed by full welding.

[0051] Optionally, the air guide fan 5 includes a first air guide fan 51 and a second air guide fan 52; the outlet end of the first secondary air pipe 41 is connected with the inlet of the first air guide fan 51, and the outlet end of the second secondary air pipe 42 is connected with the inlet of the second air guide fan 52. The outlet of the first air guide fan 51 and the outlet of the second air guide fan 52 are combined into a collecting pipe, and the gas in the upper cooling pipe and the lower cooling pipe is sent out to the chimney through the collecting pipe. The first air guide fan 51 and the second air guide fan 52 are independently controlled to start and stop, so that the temperature of the upper layer of the roller 2 and the lower layer of the roller 2 in the roller kiln is independently controlled.

[0052] Referring to Figure 5As shown, the main air flume 6 is provided with a screen 61 to prevent foreign matters from entering the cooling pipe through the main air flume 6 and causing the transverse cooling pipe 1 to be blocked. In order to facilitate the maintenance and cleaning of the screen 61, the screen 61 of the main air flume 6 is detachably installed, for example, by flange installation or plug-in installation. The screen 61 is installed at the position of the main air flume 6 outside the roller kiln, and during the cleaning process of the screen 61, the person does not need to disassemble the interior of the roller kiln, and the cleaning and maintenance are convenient. The left ring pipe 33 and the right ring pipe 34 are provided with screens, and the screens are detachably installed. The screens of the left ring pipe and the right ring pipe play a role in isolating foreign matters from entering the descending cooling pipe 14. The screen aperture is smaller than the inner diameter of the transverse cooling pipe 1, and foreign matters cannot enter the transverse cooling pipe 1 through the screen isolation.

[0053] In addition, it should be noted that various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again in the present disclosure.

[0054] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cooling section structure for a kiln for producing microcrystalline ceramic tiles, comprising a roller kiln cooling section, characterized in that: The cooling section is internally provided with a cooling unit, which is composed of transverse cooling pipes (1), the transverse cooling pipes (1) are arranged in parallel along the horizontal direction, the transverse cooling pipes (1) penetrate through the front end and the rear end of the cooling section of the roller kiln, the front end of the transverse cooling pipe (1) is connected to the main air pipe (3), the rear end of the transverse cooling pipe (1) is connected to the auxiliary air pipe (4), the auxiliary air pipe (4) is connected with an air induction fan (5), the main air pipe (3) is connected with the waste heat flue gas pipe of the firing section of the roller kiln; the front end of the main air pipe (3) is connected with an air inlet pipe, the end of the main air pipe (3) is connected with an upper cooling pipe (13) through a main air groove (6), the air inlet pipe is connected with the waste heat flue gas pipe of the firing section of the roller kiln; the main air pipe (3) is provided with an air distribution port (11), the air distribution port (11) is installed with an air distribution butterfly valve (12).

2. The structure of the cooling section of the kiln for producing microcrystalline ceramic tiles according to claim 1, characterized in that: The transverse cooling pipe (1) in the cooling unit comprises an upper cooling pipe (13) and a lower cooling pipe (14), the upper cooling pipe (13) is arranged above the roller (2) along the horizontal direction, the lower cooling pipe (14) is arranged below the roller (2) along the horizontal direction, the upper cooling pipe (13) is located in the space between the roller (2) and the top of the inner wall of the cooling section, the upper cooling pipe (13) does not contact the top of the inner wall of the cooling section or the roller (2), and the space angle between the upper cooling pipe (13) and the roller is 90 degrees; the lower cooling pipe (14) is arranged below the roller (2) along the horizontal direction, has a spacing with the roller (2) and does not directly contact the roller (2), and the space angle between the lower cooling pipe (14) and the roller (2) is 90 degrees; the lower cooling pipe (14) does not contact the bottom of the inner wall of the cooling section of the roller kiln.

3. The structure of the cooling section of the kiln for producing microcrystalline ceramic tiles according to claim 2, characterized in that: The main air pipe (3) is arranged in the form of a ring pipe, surrounds the front end of the cooling section of the roller kiln, and is perpendicular to the horizontal plane of the roller, wherein the ring pipe is divided into an upper ring pipe (31), a lower ring pipe (32), a left ring pipe (33) and a right ring pipe (34), and the four ring pipes are arranged in the form of a ring, the upper ring pipe (31) is arranged above the outside of the cooling section of the roller kiln, the lower ring pipe (32) penetrates into the inside of the front end of the cooling section of the roller kiln, the left ring pipe (33) is arranged on the left side of the outside of the cooling section of the roller kiln, and the right ring pipe (34) is arranged on the right side of the outside of the cooling section of the roller kiln.

4. The structure of the cooling section of the kiln for producing microcrystalline ceramic tiles according to claim 3, characterized in that: The upper ring pipe (31) of the main air pipe (3) is connected with a main air groove (6), the main air groove (6) is in the form of a rectangle, one end of the main air groove (6) is connected with the upper ring pipe (31) of the main air pipe (3), the other end of the main air groove (6) extends into the inside of the cooling section of the roller kiln, the main air groove (6) is uniformly provided with openings in the horizontal direction at the position in the inside of the roller kiln, the size of the openings is consistent with the size of the outer diameter of the upper cooling pipe (13), and the front end of the upper cooling pipe (13) is inserted into the hole in the inside of the main air groove (6); the connection position of the main air groove (6) and the upper cooling pipe (13) is fixedly installed by full welding; the lower ring pipe (32) is uniformly provided with openings in the inside of the roller kiln, and the size of the openings is consistent with the size of the outer diameter of the lower cooling pipe (14); the connection position of the lower ring pipe (32) and the lower cooling pipe (14) is fixedly installed by full welding.

5. The structure of the cooling section of the kiln for producing microcrystalline ceramic tiles according to claim 4, characterized in that: The first valve (35) is arranged at the connection between the main air pipe (3) and the upper ring pipe (31), and the second valve (36) is arranged at the connection between the main air pipe (3) and the left ring pipe (33).

6. The structure of the cooling section of the kiln for producing microcrystalline ceramic tiles according to claim 1, characterized in that: The auxiliary air pipe (4) is divided into a first auxiliary air pipe (41) and a second auxiliary air pipe (42), the first auxiliary air pipe (41) is arranged above the rear end of the cooling section of the roller kiln, the second auxiliary air pipe (42) is arranged below the rear end of the cooling section of the roller kiln, and the first auxiliary air pipe (41) and the second auxiliary air pipe (42) are parallel to the roller (2); the air guide fan (5) comprises a first air guide fan (51) and a second air guide fan (52); the outlet end of the first auxiliary air pipe (41) is connected with the inlet of the first air guide fan (51), and the outlet end of the second auxiliary air pipe (42) is connected with the inlet of the second air guide fan (52).

7. The structure of the cooling section of the kiln for producing microcrystalline ceramic tiles according to claim 6, characterized in that: The first auxiliary air pipe (41) is connected with the first auxiliary air duct (43) through the air distribution pipeline, the first auxiliary air duct (43) extends from the top of the roller kiln to above the horizontal plane of the roller (2) in the roller kiln, the second auxiliary air pipe (42) is connected with the second auxiliary air duct (44) through the air distribution pipeline, and the second auxiliary air duct (44) extends from the bottom of the roller kiln to below the horizontal plane of the roller (2) in the roller kiln; the first auxiliary air duct (43) and the second auxiliary air duct (44) are evenly provided with openings in the roller kiln, and the size of the openings is consistent with the outer diameter of the transverse cooling pipe (1).

8. The structure of the cooling section of the kiln for producing microcrystalline ceramic tiles according to claim 4, characterized in that: The main air duct (6) is provided with a screen, the left ring pipe (33) and the right ring pipe (34) are provided with screens, the screens are detachably installed by using flanges, and the screen aperture is smaller than the inner diameter of the transverse cooling pipe (1).

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