Blowout-preventing airtight sealing structure for kiln head of rotary kiln

Abstract

The utility model relates to the technical field of kiln body sealing, discloses a material-spraying-prevention airtight sealing structure for a kiln head of a rotary kiln, and aims to overcome the defects that in the prior art, a fish scale is simple in structure and not easy to adapt to a long-term vibration operation environment. The fish scale single pieces B are used for strengthening abutting and pressing, the fish scale single pieces A are matched with vibration, so that the sealing tightness of the fish scale assembly and the vibration adaptability of the kiln body are strengthened, the service life of the fish scale assembly is prolonged, and the fish scale assembly adapts to the long-term vibration operation environment of the kiln body; a horn cover A further hinders kinetic energy of residual materials, an annular air box forms stable micro-positive pressure through an air outlet nozzle to press dust to overflow, an auxiliary pressing mechanism utilizes the thermal expansion characteristic of nitrogen and the inward sliding performance generated when a temperature guide sliding block is pressed to achieve the extrusion effect of a pressing sliding block towards a fish scale single piece A, the dynamic pressurization function is achieved, and the sealing effect is promoted.

Description

Technical Field

[0001] This utility model relates to the field of kiln body sealing technology, and in particular to an airtight sealing structure for preventing material spraying at the kiln head of a rotary kiln. Background Technology

[0002] Rotary kilns are one of the pieces of equipment used in cement clinker production. To prevent material leakage, rotary kilns use sealing devices.

[0003] Chinese Patent Publication No. CN222718623U discloses a protective sealing structure for the kiln head of a rotary kiln, including a kiln body. A connecting ring is installed at the left end of the kiln body, and a cold air sleeve is fitted onto the surface of the kiln body. A first connecting sleeve is fitted onto the surface of the cold air sleeve, and a second connecting sleeve is connected to the right end of the first connecting sleeve. The area enclosed by the first and second steel fish scales and the cold air sleeve is under slight positive pressure. This area can cool the kiln inlet guard iron while also preventing flying sand and dust from overflowing. The first and second steel fish scales can also improve the sealing effect, resulting in a low air leakage coefficient, which significantly reduces energy consumption and stabilizes the calcination conditions of the rotary kiln.

[0004] Regarding the above and existing related technologies, the inventors believe that the following defects often exist: The first and second steel fish scales of the device have simple structures. Although the first and second steel fish scales are made to fit with the kiln body through slight positive pressure, the axial and radial vibrations generated by the kiln body during operation make the simple structures of the first and second steel fish scales prone to metal fatigue under long-term vibration operation, resulting in phenomena such as warping, which affects their fit. Therefore, there is room for improvement. Utility Model Content

[0005] The technical problem to be solved by this utility model is that the existing fish scale structure is simple and not easy to adapt to the long-term vibration operation environment. To this end, we propose a rotary kiln head anti-spraying airtight sealing structure.

[0006] To achieve the above objectives, this application adopts the following technical solution: a rotary kiln head anti-spraying airtight sealing structure, comprising a kiln body, a kiln head guard iron fixed at the front end of the kiln body, a cold air sleeve embedded in the kiln head guard iron, a gap between the inner wall of the cold air sleeve and the outer wall of the kiln body, guide plates equidistantly fixed on the inner wall of the cold air sleeve, movable spring plates uniformly connected between the inner wall of the cold air sleeve and the outer wall of the kiln body, each movable spring plate being located outside the adjacent guide plate, a conical sleeve A fitted outside the cold air sleeve, a cover sidewall welded to the front end of the conical sleeve A, a baffle flange welded to the inner wall of the conical sleeve A, a cylindrical sleeve connected to the outer side of the conical sleeve A, an annular wind box connected to the rear end of the cylindrical sleeve, a conical sleeve B welded to the inner rear end of the annular wind box, and the front end of the inner wall of the conical sleeve B and... The rear end of the outer wall of the cone-shaped sleeve A is provided with a groove, and fish scale components are installed inside the groove. The front and rear fish scale components are oriented in opposite directions. The bottom of the fish scale component on the cone-shaped sleeve B abuts against the friction sleeve fixed on the outer wall of the kiln. The bottom of the fish scale component on the cone-shaped sleeve A abuts against the outer wall of the cold air sleeve. The fish scale component includes multiple fish scale pieces A and fish scale pieces B installed in the groove. Fish scale pieces A and fish scale pieces B are arranged in a ring and alternately. The length of fish scale piece A is greater than the length of fish scale piece B. Fish scale piece B has a greater inward inclination relative to fish scale piece A. The side wall of fish scale piece A abuts against the side wall of the adjacent fish scale piece B. A T-shaped post is fixedly inserted on fish scale piece B. The two ends of the outer side of the T-shaped post abut against the outer wall of the adjacent fish scale piece A.

[0007] Preferably, the bottom of the cylindrical sleeve and the conical sleeve A are connected to a funnel. The inside of the funnel is respectively provided with a collection chamber A and a collection chamber B. The collection chamber A corresponds to the position of the cylindrical sleeve, and the collection chamber B corresponds to the position of the conical sleeve A. The bottom of the cylindrical sleeve and the conical sleeve A are respectively provided with an opening. The bottom of the funnel is connected to the grate cooler.

[0008] Preferably, the distance between the side wall of the cover and the kiln body is greater than the distance between the baffle flange and the kiln body, and both the baffle flange and the side wall of the cover have gaps with the outer wall of the cold air jacket.

[0009] Preferably, a fire baffle ring is fixed to the front end of the inner side of the cold air jacket, and a horn cover A is provided at the rear end of the cold air jacket. The cold air jacket and the horn cover A are an integral structure. A horn cover B is welded to the side of the annular air box near the horn cover A. The horn cover B is close to the inner side of the horn cover A. Air outlets are evenly arranged on the side of the annular air box near the horn cover B. The air outlets are distributed in a ring on the inner side of the horn cover B.

[0010] Preferably, the cone sleeve A and the cylindrical sleeve, and the cylindrical sleeve and the annular wind box are all connected by vertical flanges and bolts, and graphite high-temperature resistant gaskets are installed at the bolt connections.

[0011] Preferably, a corrugated gasket is provided between the fish scale piece A, the fish scale piece B and the groove, the fish scale piece A, the fish scale piece B and the groove are connected by bolts, an auxiliary pressing mechanism is provided inside the T-shaped column, and the tilting direction of the fish scale piece assembly located on the cone sleeve A is opposite to the tilting direction of the horn cover A.

[0012] Preferably, the auxiliary pressing mechanism includes a T-shaped cavity with a T-shaped column inside, guide sleeves fixed at both ends of the T-shaped cavity near the side wall of the fish scale piece B, a temperature-conducting slider slidably installed at the bottom end of the T-shaped cavity, a pressing slider slidably installed inside the guide sleeve, and nitrogen gas filling the interior of the T-shaped cavity.

[0013] Preferably, the temperature-conducting slider on the cone sleeve A is located near the baffle flange, and the temperature-conducting slider on the cone sleeve B is located near the outside air, with the guide sleeve facing the outer wall of the adjacent fish scale piece A.

[0014] The technical effects and advantages of this utility model are as follows:

[0015] In this invention, the sealing tightness of the fish-scale assembly and its adaptability to kiln vibration are enhanced by strengthening the pressure resistance of fish-scale single piece B and adapting the fish-scale single piece A to vibration, thereby improving the service life of the fish-scale assembly and adapting to the long-term vibration operation environment of the kiln. At the same time, the baffle flange and the side wall of the cover intercept most of the flying sand, and the horn cover A further hinders the kinetic energy of the residual material. The annular wind box forms a stable micro-positive pressure through the air outlet to suppress the dust overflow. The auxiliary pressing mechanism utilizes the thermal expansion characteristics of nitrogen and the inward sliding property of the temperature-conducting slider under pressure to achieve the squeezing effect of the pressing slider on the fish-scale single piece A, realizing the dynamic pressurization function. The partitioned funnel efficiently recovers flying sand. Overall, it not only reduces the risk of air and dust leakage and extends the service life of sealing components, but also has the ability to be disassembled and maintained, adapting to the complex working conditions of axial movement and radial vibration of rotary kiln. Attached Figure Description

[0016] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts:

[0017] Figure 1 This is a cross-sectional three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the vertebral body sleeve A of this utility model;

[0019] Figure 3 This is a schematic diagram of the three-dimensional structure of the speaker cover B of this utility model;

[0020] Figure 4 This is a three-dimensional structural diagram of the fish scale assembly of this utility model;

[0021] Figure 5 This is a schematic diagram of the three-dimensional structure of the T-shaped column of this utility model;

[0022] Figure 6 This is a cross-sectional planar structural diagram of the auxiliary pressing mechanism of this utility model.

[0023] Legend: 1. Kiln body; 2. Kiln head guard; 3. Cold air jacket; 31. Guide plate; 32. Movable spring plate; 33. Horn cover A; 34. Fire baffle ring; 4. Conical sleeve A; 41. Material retaining flange; 42. Side wall of the cover; 5. Cylindrical sleeve; 6. Annular air box; 61. Horn cover B; 62. Air outlet; 7. Conical sleeve B; 8. Fish scale assembly; 81. Fish scale piece A; 82. Fish scale piece B; 83. T-shaped column; 9. Funnel; 91. Collection chamber A; 92. Collection chamber B; 10. Auxiliary pressing mechanism; 101. T-shaped cavity; 102. Guide sleeve; 103. Temperature guiding slider; 104. Pressing slider; 11. Friction sleeve. Detailed Implementation

[0024] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0025] Reference Figures 1-4As shown, this utility model provides a technical solution: a rotary kiln head anti-spraying airtight sealing structure, including a kiln body 1, a kiln head guard 2 fixed at the front end of the kiln body 1, a cold air sleeve 3 embedded in the kiln head guard 2, a gap between the inner wall of the cold air sleeve 3 and the outer wall of the kiln body 1, guide plates 31 fixed at equal intervals on the inner wall of the cold air sleeve 3, movable spring plates 32 uniformly connected between the inner wall of the cold air sleeve 3 and the outer wall of the kiln body 1, each movable spring plate 32 being located on the outer side of an adjacent guide plate 31, a conical sleeve A4 sleeved on the outside of the cold air sleeve 3, a cover sidewall 42 welded to the front end of the conical sleeve A4, a baffle flange 41 welded to the inner wall of the conical sleeve A4, a cylindrical sleeve 5 connected to the outer side of the conical sleeve A4, an annular wind box 6 connected to the rear end of the cylindrical sleeve 5, a conical sleeve B7 welded to the inner rear end of the annular wind box 6, and the front end of the inner wall of the conical sleeve B7 and the outer wall of the conical sleeve A4... Each rear end has a groove, and a fish scale assembly 8 is installed inside the groove. The front and rear fish scale assemblies 8 are oriented in opposite directions. The bottom of the fish scale assembly 8 on the cone sleeve B7 abuts against the friction sleeve 11 fixed on the outer wall of the kiln body 1. The bottom of the fish scale assembly 8 on the cone sleeve A4 abuts against the outer wall of the cold air sleeve 3. The fish scale assembly 8 includes multiple fish scale pieces A81 and fish scale pieces B82 installed in the groove. The fish scale pieces A81 and fish scale pieces B82 are arranged in a ring and alternately. The length of fish scale piece A81 is greater than the length of fish scale piece B82. The inward inclination of fish scale piece B82 relative to fish scale piece A81 is greater. The side wall of fish scale piece A81 abuts against the side wall of the adjacent fish scale piece B82. A T-shaped post 83 is fixedly inserted on the fish scale piece B82. The two ends of the outer side of the T-shaped post 83 abut against the outer wall of the adjacent fish scale piece A81, respectively.

[0026] The two fish-scale components 8 are arranged to work with the cylindrical sleeve 5 to form a relatively closed environment. This environment, in turn, contacts the annular bellows 6 to blow air onto the cold air sleeve 3, creating a slightly positive pressure environment higher than the external pressure. This suppresses the small amount of fly sand ejected from the kiln body 1, preventing its overflow. Simultaneously, the cone-shaped sleeve A4, along with the baffle flange 41 and the side wall 42 of the cover, physically intercepts most of the fly sand. The cone structure of the cone-shaped sleeve A4 enhances the impact resistance of the baffle flange 41, increasing its physical interception life. Furthermore, the fish-scale single pieces A81 and B82, utilizing their length difference (with B82 being shorter and having greater rigidity), effectively intercept the fly sand. The kiln body 1 and the outer wall of the cold air jacket 3 have a stronger pressing effect. In conjunction with the T-shaped column 83, the pressing effect of the fish scale piece A81 can be further ensured. Here, both fish scale pieces B82 and A81 are composite materials with a certain thickness. Since the lengths of the two are different, their tilt angles relative to the horizontal plane are slightly different to ensure the sealing effect. This ensures the fit between the edge and the kiln body 1 or the cold air jacket 3, and the tilt angle does not affect the fit between the sides of adjacent fish scale pieces, that is, it ensures that no misalignment gaps will be generated between adjacent sides. Although the rigidity of fish scale piece A81 is small, its deformation allowance is large, which can better adapt to the radial vibration of the kiln body 1, thereby improving the overall sealing tightness and adaptability of the fish scale piece assembly 8.

[0027] Reference Figure 1 As shown in this embodiment: the bottom of the outer sides of the cylindrical sleeve 5 and the conical sleeve A4 are connected to a funnel 9. The inside of the funnel 9 is respectively provided with a collection chamber A91 and a collection chamber B92. The collection chamber A91 corresponds to the position of the cylindrical sleeve 5, and the collection chamber B92 corresponds to the position of the conical sleeve A4. The bottom of the cylindrical sleeve 5 and the conical sleeve A4 are respectively provided with openings. The bottom of the funnel 9 is connected to the grate cooler.

[0028] Using funnel 9, the fly sand material retained in cone sleeve A4 and cylindrical sleeve 5 can fall into collection chamber B92 and collection chamber A91 under the action of gravity, and be collected centrally by grate cooler.

[0029] Reference Figure 1 As shown, the distance between the side wall 42 of the cover and the kiln body 1 is greater than the distance between the baffle flange 41 and the kiln body 1. Both the baffle flange 41 and the side wall 42 of the cover have gaps with the outer wall of the cold air jacket 3.

[0030] By utilizing the cooperation of the side wall 42 of the cover and the baffle flange 41, the front end of the flying sand material sprayed from the kiln body 1 can be physically blocked, causing a large amount of flying sand material to lose kinetic energy due to direct impact, and then fall into the funnel 9 under the action of gravity.

[0031] Reference Figure 1 , Figure 3 As shown, a fire baffle ring 34 is fixed to the front end of the inner side of the cold air jacket 3, and a horn cover A33 is provided at the rear end of the cold air jacket 3. The cold air jacket 3 and the horn cover A33 are an integral structure. A horn cover B61 is welded to the side of the annular air box 6 near the horn cover A33. The horn cover B61 is close to the inner side of the horn cover A33. Air outlets 62 are evenly arranged on the side of the annular air box 6 near the horn cover B61. The air outlets 62 are distributed in a ring on the inner side of the horn cover B61.

[0032] The cooperation of the horn cover A33 and the horn cover B61 is used to further guide the cold air blown out of the air outlet 62, so that the cold air is evenly blown into the gap between the cold air sleeve 3 and the kiln body 1, thereby improving the real-time cooling effect on the kiln body 1.

[0033] Reference Figure 1 As shown, the cone sleeve A4 and the cylindrical sleeve 5, and the cylindrical sleeve 5 and the annular wind box 6 are all connected by vertical flanges and bolts, and graphite high-temperature resistant gaskets are installed at the bolt connections.

[0034] By using flanges, bolts, and graphite high-temperature gaskets, the components can be disassembled and assembled to facilitate subsequent inspection and maintenance, while ensuring the reliability and sealing of the assembly.

[0035] Reference Figure 2 As shown, a corrugated gasket is provided between the fish scale pieces A81 and B82 and the groove. The fish scale pieces A81 and B82 and the groove are connected by bolts. An auxiliary pressing mechanism 10 is provided inside the T-shaped column 83. The tilting direction of the fish scale assembly 8 on the cone sleeve A4 is opposite to the tilting direction of the horn cover A33.

[0036] The use of wavy gaskets promotes tighter connection between fish scale pieces A81 and B82 and the groove, while improving the stability of the connection when the device vibrates, preventing fish scale pieces A81 and B82 from detaching from the groove, and ensuring the fitting accuracy of the free ends of fish scale pieces A81 and B82. The use of the horn cover A33 in conjunction with the fish scale assembly 8 promotes the obstruction of flying sand in the path of entering this stage, thereby further reducing the outward escape of flying sand and improving the physical interception effect.

[0037] Reference Figure 5 , Figure 6 As shown, the auxiliary pressing mechanism 10 includes a T-shaped cavity 101 with a T-shaped column 83 inside. Guide sleeves 102 are fixed at both ends of the T-shaped cavity 101 near the side wall of the fish scale piece B82. A temperature-conducting slider 103 is slidably installed at the bottom end of the T-shaped cavity 101. A pressing slider 104 is slidably installed inside the guide sleeve 102. The interior of the T-shaped cavity 101 is filled with nitrogen.

[0038] Utilizing the significant temperature change of nitrogen gas inside the T-shaped cavity 101, when a sudden positive pressure is generated in the kiln body 1 and flying sand is sprayed outward, its high temperature will enter the interior of the conical sleeve A4 and the cylindrical sleeve 5, thereby heating up the pressing slider 104 and increasing the gas pressure inside the T-shaped cavity 101. This will promote the outward sliding of the pressing slider 104, thereby enhancing the pressing effect of the pressing slider 104 on the fish scale piece A81, thus improving the overall sealing of the fish scale assembly 8 and further reducing the leakage of flying sand.

[0039] Reference Figure 6 As shown, the temperature-conducting slider 103 on the cone sleeve A4 is located near the baffle flange 41, and the temperature-conducting slider 103 on the cone sleeve B7 is located near the outside air. The guide sleeve 102 is oriented towards the outer wall of the adjacent fish scale piece A81.

[0040] By utilizing the different orientations of the fish scale components 8 on the cone sleeve A4 and cone sleeve B7, and coordinating with the micro-positive pressure rings within the space of cone sleeve A4 and cone sleeve B7, the fish scale pieces A81 and B82 are improved to adhere to the friction sleeve 11 and the outer wall of the cooling sleeve 3. At the same time, the fish scale components 8 located on cone sleeve B7, in conjunction with the auxiliary pressing mechanism 10, are used. The nitrogen filling pressure inside the T-shaped cavity 101 is slightly higher than the external air pressure to ensure that the pressing slider 104 is maintained under the cooling effect of the annular air box 6. Meanwhile, when external air moves into the cylindrical sleeve 5, its air pressure can promote the outward-facing heat-conducting slider 103 to be squeezed inward, thereby pressing the fish scale piece A81 with the two inner pressing sliders 104.

[0041] Working principle: Under normal operation, the kiln body 1 is under negative pressure. When the kiln body 1 experiences a momentary positive pressure, the gas containing dust is sprayed outward along the outer edge of the cold air sleeve 3 along the kiln head guard 2. First, the flying sand will hit the baffle flange 41, causing most of the flying sand to lose kinetic energy and fall into the lower collection chamber B92 under the action of gravity. Some flying sand will break through the fish scale assembly 8 on the conical sleeve A4 and enter the interior of the conical sleeve A4 and the cylindrical sleeve 5. During the movement, this part of the flying sand will be obstructed by the horn cover A33 and lose kinetic energy. At the same time, because the annular wind box 6 continuously delivers cold air to the direction of the guide plate 31 through the air outlet 62 under the working state of the kiln body 1, a slight positive pressure is formed in the space formed by the conical sleeve A4, the cylindrical sleeve 5 and the two fish scale assemblies 8. Under this pressure, the flying sand continuously sprayed towards the annular wind box 6 is further suppressed, so that this part of the flying sand is collected in the collection chamber A91 under the action of gravity and collected uniformly by the grate cooler.

[0042] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A back end of a rotary kiln material spraying gas-tight seal structure, characterized in that, The kiln body is provided with a kiln head protection iron fixed at the front end, a cold air sleeve embedded on the kiln head protection iron, a gap between the inner wall of the cold air sleeve and the outer wall of the kiln body, flow guide plates equidistantly fixed on the inner wall of the cold air sleeve, movable spring plates uniformly connected between the inner wall of the cold air sleeve and the outer wall of the kiln body, each movable spring plate located outside the adjacent flow guide plate, a vertebral body sleeve A externally sleeved on the cold air sleeve, a cover side wall welded at the front end of the vertebral body sleeve A, a material blocking flange welded on the inner wall of the vertebral body sleeve A, a cylindrical sleeve connected to the outside of the vertebral body sleeve A, a ring-shaped air bellow connected to the rear end of the cylindrical sleeve, a vertebral body sleeve B welded on the inner side rear end of the ring-shaped air bellow, recesses formed at the front end of the inner wall of the vertebral body sleeve B and the rear end of the outer wall of the vertebral body sleeve A, fish scale assemblies installed in the recesses, the directions of the fish scale assemblies on the front and rear sides being opposite to each other, the bottom of the fish scale assembly on the vertebral body sleeve B abutting against a friction sleeve fixed on the outer wall of the kiln body, the bottom of the fish scale assembly on the vertebral body sleeve A abutting against the outer wall of the cold air sleeve, the fish scale assembly comprising a plurality of fish scale single pieces A and fish scale single pieces B installed in the recesses, the fish scale single pieces A and the fish scale single pieces B being alternately distributed in a ring shape, the length of the fish scale single piece A being greater than the length of the fish scale single piece B, the fish scale single piece B being more inwardly inclined than the fish scale single piece A, the side wall of the fish scale single piece A abutting against the side wall of the adjacent fish scale single piece B, a T-shaped column fixedly inserted on the fish scale single piece B, the two ends of the T-shaped column on the outside abutting against the outer walls of the adjacent fish scale single pieces A.

2. The back-end material-spray-proofing seal structure of a rotary kiln according to claim 1, characterized in that: The bottom of the cylindrical sleeve and the outside of the vertebral body sleeve A are jointly connected with a hopper, the inside of the hopper is respectively provided with a collecting cavity A and a collecting cavity B, the collecting cavity A corresponds to the position of the cylindrical sleeve, the collecting cavity B corresponds to the position of the vertebral body sleeve A, the bottom of the cylindrical sleeve and the bottom of the vertebral body sleeve A are respectively provided with openings, and the bottom of the hopper is connected with a grate cooler.

3. The back end of the rotary kiln material spraying gas tight seal structure according to claim 1, characterized in that: The distance between the cover side wall and the kiln body is greater than the distance between the material blocking flange and the kiln body, and the material blocking flange and the cover side wall are both spaced apart from the outer wall of the cold air sleeve.

4. The back-end material-spray-proofing seal structure of a rotary kiln according to claim 1, characterized in that: The front end of the inner side of the cold air sleeve is fixed with a fire blocking ring, the rear end of the cold air sleeve is provided with a horn cover A, the cold air sleeve and the horn cover A are of an integral structure, the side of the ring-shaped air bellow close to the horn cover A is welded with a horn cover B, the inside of the horn cover B close to the horn cover A, the side of the ring-shaped air bellow close to the horn cover B is uniformly provided with air outlets, and the air outlets are annularly distributed on the inside of the horn cover B.

5. A back-up seal for a rotary kiln head according to claim 1, wherein: The vertebral body sleeve A and the cylindrical sleeve, the cylindrical sleeve and the ring-shaped air bellow are connected through vertical flanges and bolts, and a graphite high-temperature-resistant gasket is arranged on the bolt connection.

6. A backseal structure for a kiln head of a rotary kiln according to claim 4, wherein: The fish scale single piece A, the fish scale single piece B and the groove are provided with a wave-shaped gasket, the fish scale single piece A, the fish scale single piece B and the groove are connected through bolts, the inside of the T-shaped column is provided with an auxiliary compression mechanism, the inclination direction of the fish scale assembly on the vertebral body sleeve A is opposite to the inclination direction of the horn cover A.

7. A back-end dust gas-tight seal structure for a rotary kiln according to claim 6, characterized in that: The auxiliary compression mechanism comprises a T-shaped cavity opened in the inside of the T-shaped column, both ends of the T-shaped cavity close to the fish scale single piece B side wall are fixed with guide sleeves, the bottom end of the T-shaped cavity is slidably installed with a temperature guide sliding block, the inside of the guide sleeve is slidably installed with a compression sliding block, and the inside of the T-shaped cavity is filled with nitrogen.

8. A backseal structure for a kiln head of a rotary kiln according to claim 7, characterised in that: The temperature guide sliding block on the vertebral body sleeve A is located close to the material blocking flange, the temperature guide sliding block on the vertebral body sleeve B is located close to external air, and the direction of the guide sleeve is towards the outer wall of the adjacent fish scale single piece A.

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