A rotary kiln with a flexible labyrinth sealing structure

Abstract

The present invention discloses a rotary kiln with a flexible labyrinth sealing structure in the field of rotary kiln sealing technology. The rotary kiln comprises a rotary kiln body, a smoke chamber shell, and a sealing structure installed between the rotary kiln body and the smoke chamber shell. The sealing structure comprises: an outer shell fixed to the smoke chamber shell, and a supporting flange fixedly connected to the rotary kiln body. The sealing structure further comprises: a movable labyrinth ring and a fixed labyrinth ring, wherein the movable labyrinth ring is installed at one end of a friction sleeve extending into the outer shell, and the fixed labyrinth ring is fixed at one end of the outer shell close to the friction sleeve. A flexible sealing member is fixed at one side of the outer shell end and is pressed against the side wall of the friction sleeve at the other side. A balancing ring is elastically slidably connected to the inner side wall of the outer shell. A balancing column is fixed on the side wall of the balancing ring. An adjusting component reduces the pressure on the flexible sealing member according to the moving distance of the balancing ring, can absorb the axial and radial expansion of the rotary kiln body, and gradually reduces the extrusion on the flexible sealing member, thereby reducing the wear of the flexible sealing member.

Description

Technical Field

[0001] The invention relates to the technical field of rotary kiln sealing, in particular to a rotary kiln with a flexible labyrinth sealing structure. Background Art

[0002] When rotary kilns are used in cement production, ensuring that materials do not leak when entering and exiting the hopper is crucial. Existing rotary kilns utilize dynamic sealing technologies, such as labyrinth seals and fish-scale laminated seals, because the furnace tubes rotate while the hopper remains stationary.

[0003] Traditional sealing technology is difficult to adapt to the expansion of the rotary kiln. The expansion of the rotary kiln body will cause varying degrees of damage to the traditional sealing structure. When using labyrinth sealing technology to seal the rotary kiln, gaps must be reserved in advance. These gaps are relatively large in the initial operation of the rotary kiln, resulting in poor initial sealing effect, a longer preheating time for the rotary kiln, and increased preheating costs. When using flexible sealing technologies such as fish-scale laminated seals, they will become tightened due to the radial expansion of the rotary kiln body, increasing friction between them and the rotary kiln body, shortening their service life and requiring frequent replacement. Summary of the Invention

[0004] The present invention provides a rotary kiln with a flexible labyrinth seal structure, which is used to solve the technical problems of material and air leakage at the connection, difficulty in absorbing expansion, short service life and high maintenance cost during the operation of the rotary kiln.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a rotary kiln with a flexible labyrinth-type sealing structure, comprising a rotary kiln body, a smoke chamber shell, and a sealing structure installed between the rotary kiln body and the smoke chamber shell. The sealing structure comprises: an outer shell fixed to the smoke chamber shell, a support flange fixedly connected to the rotary kiln body, the support flange being rotatably arranged relative to the outer shell, and a friction sleeve having an end portion extending into the outer shell fixedly provided on the outer wall of the support flange;

[0006] The sealing structure further comprises:

[0007] A movable labyrinth ring and a fixed labyrinth ring, wherein the movable labyrinth ring is mounted on one end of the friction sleeve extending into the housing, and the fixed labyrinth ring is fixed on one end of the housing close to the friction sleeve;

[0008] A flexible seal, one side of which is fixed to the end of the housing and the other side is pressed against the side wall of the friction sleeve;

[0009] a balancing ring elastically and slidably connected to the inner wall of the housing;

[0010] The balancing column is fixed on the side wall of the balancing ring and is used to keep the distance between the balancing ring and the movable labyrinth ring unchanged when the rotary kiln body extends axially;

[0011] The adjustment component can reduce the pressure on the flexible seal according to the movement distance of the balance ring.

[0012] As a further embodiment of the present invention, the adjustment component includes:

[0013] The bracket and the hollow mounting frame are both fixedly mounted on the outside of the housing, and the hollow mounting frame is used to fix the flexible sealing member;

[0014] The fastening blocks are arranged in a circumferential array outside the flexible sealing member and are all elastically slidably connected to the bracket;

[0015] A trigger member is elastically slidably arranged on the side wall of the bracket and is used to adjust the elastic force between the fastening block and the bracket;

[0016] A crossbar, fixed to the end of the trigger member;

[0017] The transmission member drives the trigger member to move synchronously according to the moving distance of the balance ring, so as to adjust the elastic force between the fastening block and the bracket.

[0018] As a further solution of the present invention, the trigger members are fixedly connected to adjustment springs, the adjustment springs are fixedly connected to adjustment members slidingly arranged with the bracket, the side walls of the adjustment members are fixedly provided with adjustment pins, the trigger members are fixedly provided with trigger angles, and the trigger angles are provided with adjustment slots for driving the adjustment pins to rise and fall.

[0019] As a further solution of the present invention, the transmission member includes:

[0020] The transmission rod is rotatably arranged in the housing and is slidably arranged with the balance ring;

[0021] A driving groove and a driving pin, wherein the driving groove is formed on the side wall of the transmission rod and the driving pin is fixed on the balance ring;

[0022] The driving wheel and the driven wheel are both rotatably arranged in the hollow mounting frame, the driving wheel is fixed to the end of the transmission rod, and a driving ring for transmission is provided between the driving wheel and the driven wheel;

[0023] A rocker arm is rotatably arranged outside the flexible seal, and its end contacts the crossbar;

[0024] The connecting piece passes through the flexible sealing piece, and its two ends are respectively connected to the driven wheel and the rocker.

[0025] As a further solution of the present invention, there are several transmission rods, driving wheels, driven wheels, rockers, cross bars and triggering members, which are arranged in a circular array on both sides of the flexible seal, and a cavity for installing the driving wheel, driven wheel and rocker is provided in the hollow mounting frame; the rocker is tilted, and when the rocker rotates, it can gradually press the flexible seal, thereby increasing the pressure between the flexible seal and the hollow mounting frame.

[0026] As a further solution of the present invention, a material lifting scoop is fixedly provided on the side wall of the support flange, and the material lifting scoop is a U-shaped structure. A material blocking sleeve is fixedly provided on the inner side of the shell, and the end of the material blocking sleeve is flush with the inner end surface of the material lifting scoop.

[0027] As a further solution of the present invention, both the inner and outer sides of the flexible seal are made of high-temperature-resistant and wear-resistant toughness steel mesh, and the middle of the flexible seal is made of flexible graphite fiber.

[0028] As a further solution of the present invention, a heat insulation plate is fixedly provided on the inner side of the material blocking sleeve, and the heat insulation plate includes a heat preservation layer and a high temperature resistant layer.

[0029] As a further solution of the present invention, a heat insulation plate is fixedly provided on the inner side of the material blocking sleeve, and the heat insulation plate includes a heat preservation layer and a high temperature resistant layer.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. In the present invention, the balance column ensures that the gap between the balance block and the movable labyrinth ring remains consistent, ensuring the sealing effect of the movable labyrinth ring and the fixed labyrinth ring in the initial state, thereby reducing the sealing pressure of the flexible seal in the initial state; at the same time, the adjustment component also synchronously reduces the pressure on the flexible seal according to the movement distance of the balance ring to cope with the increased diameter of the rotary kiln body, avoid the radial expansion of the rotary kiln body, which leads to excessive pressure between the flexible seal and the friction sleeve, resulting in excessive friction between the flexible seal and the friction sleeve, accelerated wear of the flexible seal and the friction sleeve, and shortened service life of the flexible seal and the friction sleeve.

[0032] 2. The sealing structure of the present invention can flexibly absorb the expansion; the movable labyrinth ring, the material lifting spoon, the support flange friction sleeve connected to the rotary kiln body and the outer shell and the material blocking sleeve connected to the smoke chamber are not in direct contact. The radial gap between the material lifting spoon and the material blocking sleeve, the axial gap between the material lifting spoon and the outer shell, and the radial and axial gaps between the movable labyrinth ring and the outer shell can absorb the expansion of the rotary kiln body in all directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0036] Figure 3 For the present invention Figure 2 A in the middle is an enlarged structural diagram;

[0037] Figure 4 For the present invention Figure 3 The enlarged structural diagram at B in the middle;

[0038] Figure 5 For the present invention Figure 3 The enlarged structural diagram at C in the middle;

[0039] Figure 6 For the present invention Figure 3 The enlarged structural diagram at D in the middle;

[0040] Figure 7 This is a schematic diagram of the motion state of the adjusting member of the present invention;

[0041] Figure 8 This is a schematic diagram of the motion state of the trigger member of the present invention;

[0042] Figure 9 This is a schematic diagram of the trigger member and its connection relationship structure of the present invention;

[0043] Figure 10 This is a schematic diagram of the motion state of the existing flexible seal of the present invention;

[0044] Figure numerals: 1. smoke chamber shell; 2. sealing structure; 21. outer shell; 22. supporting flange; 23. friction sleeve; 24. movable labyrinth ring; 25. fixed labyrinth ring; 26. flexible seal; 27. balance ring; 28. balance column; 3. adjustment assembly; 31. bracket; 32. hollow mounting frame; 33. fastening block; 34. trigger member; 35. cross bar; 36. adjustment spring; 37. adjustment member; 38. adjustment pin; 39. trigger angle; 30. adjustment slot; 4. transmission member; 41. transmission rod; 42. driving slot; 43. driving pin; 44. driving wheel; 45. driven wheel; 46. driving ring; 47. rocker; 48. connecting member; 5. cavity; 6. lifting spoon; 7. material blocking sleeve; 8. heat insulation board; 9. rotary kiln body. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] See also Figures 1-10The present invention provides a technical solution: a rotary kiln with a flexible labyrinth sealing structure, comprising a rotary kiln body 9 and a smoke chamber shell 1, and a sealing structure 2 installed between the rotary kiln body 9 and the smoke chamber shell 1. It should be noted that the rotary kiln body 9 is the portion of the rotary kiln in the prior art without the end sealing structure. The specific structure is prior art and will not be described in detail. The sealing structure 2 comprises: an outer shell 21 fixed to the smoke chamber shell 1, a support flange 22 fixedly connected to the rotary kiln body 9, the support flange 22 being rotatably arranged relative to the outer shell 21, and a friction sleeve 23 having an end extending into the outer shell 21 fixed to the outer wall of the support flange 22; the outer shell 21 is welded to the smoke chamber shell 1 as a whole through a reinforcing rib plate;

[0047] The sealing structure 2 further includes:

[0048] A movable labyrinth ring 24 and a fixed labyrinth ring 25 . The movable labyrinth ring 24 is mounted on one end of the friction sleeve 23 extending into the housing 21 . The fixed labyrinth ring 25 is fixed on one end of the housing 21 close to the friction sleeve 23 .

[0049] The flexible seal 26 has one side fixed to the end of the housing 21 and the other side pressed against the side wall of the friction sleeve 23;

[0050] The balancing ring 27 is elastically and slidably connected to the inner wall of the housing 21;

[0051] The balancing column 28 is fixed on the side wall of the balancing ring 27 and is used to keep the distance between the balancing ring 27 and the movable labyrinth ring 24 unchanged when the rotary kiln body 9 is axially extended;

[0052] The length of the balancing column 28 can be selected according to actual conditions. In the initial state, the rotary kiln body 9 is at room temperature, and the rotary kiln body 9 is in a natural state in both radial and axial directions. The gap between the ends of the movable labyrinth ring 24 and the fixed labyrinth ring 25 is large, which makes the sealing effect of the sealing structure 2 poor. The balancing column 28 can keep the distance between the balancing ring 27 and the movable labyrinth ring 24 unchanged, ensuring the sealing effect of the movable labyrinth ring 24 and the fixed labyrinth ring 25 in the initial state, thereby reducing the sealing pressure of the flexible seal 26 in the initial state; wear-resistant heat-insulating material, such as inorganic fiber felt, volcanic rock, etc., is provided between the balancing ring 27 and the shell 21 to reduce heat transfer and reduce the impact of temperature on the shell 21;

[0053] Adjusting assembly 3, reducing pressure on flexible seal 26 according to the movement distance of balance ring 27;

[0054] Specifically, when the rotary kiln is working, the temperature inside the rotary kiln body 9 gradually increases with time, and the rotary kiln body 9 expands axially and radially due to the heat;

[0055] When the rotary kiln body 9 expands axially, the end of the rotary kiln body 9 drives the friction sleeve 23 to move through the support flange 22, and the friction sleeve 23 drives the movable labyrinth ring 24 to move. The movable labyrinth ring 24 pushes the adjustment member 27 to move through the balance column 28, thereby compensating for the axial expansion of the rotary kiln body 9, preventing the rotary kiln body 9 from being damaged due to the increase in length, and maintaining the sealing effect of the sealing structure 2;

[0056] The rotary kiln body 9 expands radially. Since the radial expansion and axial expansion of the rotary kiln body 9 are in equal proportion, in the present invention, the adjustment component 3 synchronously reduces the pressure on the flexible seal 26 according to the movement distance of the balance ring 27 to cope with the increased diameter of the rotary kiln body 9, thereby avoiding excessive pressure between the flexible seal 26 and the friction sleeve 23 due to the radial expansion of the rotary kiln body 9, resulting in excessive friction between the flexible seal 26 and the friction sleeve 23, accelerating the wear of the flexible seal 26 and the friction sleeve 23, and reducing the service life of the flexible seal 26 and the friction sleeve 23.

[0057] In summary, in the present invention, the balance column 28 is used to ensure that the gap between the balance block 27 and the movable labyrinth ring 24 remains consistent, thereby ensuring the sealing effect of the movable labyrinth ring 24 and the fixed labyrinth ring 25 in the initial state and reducing the sealing pressure of the flexible seal 26 in the initial state; at the same time, the adjustment component 3 also synchronously reduces the pressure on the flexible seal 26 according to the movement distance of the balance ring 27 to cope with the increased diameter of the rotary kiln body 9 and avoid excessive pressure between the flexible seal 26 and the friction sleeve 23 due to the radial expansion of the rotary kiln body 9, resulting in excessive friction between the flexible seal 26 and the friction sleeve 23, accelerating the wear of the flexible seal 26 and the friction sleeve 23, and reducing the service life of the flexible seal 26 and the friction sleeve 23;

[0058] The gap between the lifting scoop 6 and the blocking sleeve 7 performs the first level of blocking. The second level of blocking is the channel formed by the movable labyrinth ring 24, the fixed labyrinth ring 25, the housing 21 and the friction sleeve 23. The flexible seal 26 fits tightly with the friction sleeve 23, and the entire friction sleeve 23 is wrapped therein, performing the third level of blocking.

[0059] The sealing structure 2 can flexibly absorb the expansion; the movable labyrinth ring 24, the material lifting spoon 6, the support flange 22, the friction sleeve 23 connected to the rotary kiln body 9, and the outer shell 21 and the material blocking sleeve 7 connected to the smoke chamber are not in direct contact. Only the balance columns 2828 abut against the movable labyrinth ring 24. The contact area of ​​the end of the balance column 28 is very small compared to the side wall of the movable labyrinth ring 24, and the heat transfer that can be carried out is negligible. The radial gap between the material lifting spoon 6 and the material blocking sleeve 7, the axial gap between the material lifting spoon 6 and the outer shell 21, and the radial and axial gaps between the movable labyrinth ring 24 and the outer shell 21 can absorb the expansion of the rotary kiln body 9 in all directions;

[0060] Due to the hollow structure design of the sealing structure 2, the internal air can play a buffering role, and the internal air will not be affected by the long-term operation of the rotary kiln or high-temperature deformation, affecting the service life. The heat insulation plate 8 protects the entire device from the inside to reduce the erosion of high-temperature airflow; secondly, the flexible seal 26 and the friction sleeve 23 are at room temperature, and the service life is extended at a low ambient temperature.

[0061] As a further solution of the present invention, the adjustment component 3 includes:

[0062] The bracket 31 and the hollow mounting frame 32 are both fixedly mounted on the outside of the housing 21 , and the hollow mounting frame 32 is used to fix the flexible sealing member 26 ;

[0063] The fastening blocks 33 are arranged in a circumferential array outside the flexible seal 26 and are all elastically slidably connected to the bracket 31;

[0064] A trigger member 34 is elastically slidably disposed on the side wall of the bracket 31 and is used to adjust the elastic force between the fastening block 33 and the bracket 31;

[0065] The crossbar 35 is fixed to the end of the trigger member 34;

[0066] The transmission member 4 synchronously drives the trigger member 34 to move according to the moving distance of the balance ring 27, so as to adjust the elastic force between the fastening block 33 and the bracket 31;

[0067] The trigger members 34 are all fixedly connected to adjustment springs 36, and the adjustment springs 36 are all fixedly connected to adjustment members 37 slidably arranged with the bracket 31. The side wall of the adjustment member 37 is fixedly provided with an adjustment pin 38. The trigger member 34 is fixedly provided with a trigger angle 39, and the trigger angle 39 is provided with an adjustment slot 30 for driving the adjustment pin 38 to rise and fall.

[0068] The transmission member 4 includes:

[0069] The transmission rod 41 is rotatably disposed in the housing 21 and is slidably disposed with the balance ring 27;

[0070] A driving slot 42 and a driving pin 43, wherein the driving slot 42 is formed on the side wall of the transmission rod 41 and the driving pin 43 is fixed on the balance ring 27;

[0071] The driving wheel 44 and the driven wheel 45 are both rotatably mounted in the hollow mounting frame 32. The driving wheel 44 is fixed to the end of the transmission rod 41. A driving ring 46 for transmission is provided between the driving wheel 44 and the driven wheel 45.

[0072] The rocker 47 is rotatably arranged outside the flexible seal 26, and its end contacts the crossbar 35;

[0073] The connecting member 48 passes through the flexible sealing member 26 and is connected to the driven wheel 45 and the rocker 47 at both ends respectively;

[0074] Specifically, when the kiln body 9 of the rotary kiln expands axially, the balance ring 27 drives the driving pin 43 to move synchronously, the driving pin 43 drives the transmission rod 41 to rotate through the driving groove 42, the transmission rod 41 drives the driving wheel 44 at the end to rotate, the driving wheel 44 drives the driven wheel 45 to rotate through the driving ring 46, the driven wheel 45 drives the rocker 47 to rotate through the connecting piece 48, the rocker 47 end drives the trigger member 34 to move by squeezing the cross bar 35, the trigger member 34 pushes the trigger angle 39 into the bracket 31, and the trigger angle 39 drives the adjusting pin 38 away from the bracket 31 through the adjusting groove 30. The adjusting member 37 moves away from the fastening block 33, and the adjusting member 37 rises accordingly. As the adjusting member 37 rises, the distance between the adjusting member 37 and the fastening block 33 increases, and the length of the adjusting spring 36 located between the adjusting member 37 and the fastening block 33 increases. The adjusting spring 36 releases part of its elastic force, reducing the thrust on the fastening block 33, thereby reducing the friction force of the flexible seal 26 on the friction sleeve 23, so as to cope with the problem that the radial expansion of the rotary kiln body 9 causes the diameter to increase, resulting in an increase in the friction force between the flexible seal 26 and the friction sleeve 23, and accelerating the wear of the seal 26 and the friction sleeve 23.

[0075] As a further embodiment of the present invention, a plurality of transmission rods 41, drive wheels 44, driven wheels 45, rocking arms 47, cross bars 35, and trigger members 34 are arranged in a circular array on both sides of the flexible seal 26. A cavity 5 for mounting the drive wheels 44, driven wheels 45, and rocking arms 47 is provided in the hollow mounting frame 32. The rocking arms 47 are tilted. When the rocking arms 47 rotate, they gradually press the flexible seal 26, thereby increasing the pressure between the flexible seal 26 and the hollow mounting frame 32.

[0076] The flexible seal 26 is a wearing part. In order to facilitate replacement, the flexible seal 26 is made of multiple pieces. The flexible seal 26 is fixed to the rotary kiln by bolts and nuts. As the rotary kiln body 9 expands radially, the side of the flexible seal 26 in contact with the rotary kiln body 9 moves away from the axis of the rotary kiln body 9, and the other side of the flexible seal 26 gradually rises (such as Figure 10 As shown), resulting in reduced sealing effect of the flexible seal 26;

[0077] Specifically, the driven wheel 45 inside the cavity 5 drives the rocker 47 outside the flexible seal 26 to rotate through the connecting piece 48. Since the rocker 47 is tilted, as the expansion of the rotary kiln body 9 increases, the rotation angle of the rocker 47 increases, and the pressing force of the rocker 47 on the flexible seal 26 increases, ensuring that the flexible seal 26 and the hollow mounting frame 32 are always in a fit state, thereby enhancing the sealing effect of the flexible seal 26.

[0078] As a further solution of the present invention, a material lifting scoop 6 is fixedly provided on the side wall of the support flange 22. The material lifting scoop 6 is a U-shaped structure. A material blocking sleeve 7 is fixedly provided on the inner side of the housing 21. The end of the material blocking sleeve 7 is flush with the inner end surface of the material lifting scoop 6.

[0079] Specifically, the lifting spoon 6 can not only receive the material, but also work together with the material blocking sleeve 7 to perform the first sealing on the material.

[0080] As a further solution of the present invention, the flexible seal 26 is made of high temperature and wear resistant toughness steel mesh inside and outside, and the middle of the flexible seal 26 is made of flexible graphite fiber; the high temperature resistance and wear resistance of the flexible seal 26 are improved.

[0081] As a further solution of the present invention, a heat insulation plate 8 is fixedly provided on the inner side of the blocking sleeve 7, and the heat insulation plate 8 includes a heat preservation layer and a high temperature resistant layer;

[0082] Specifically, the retaining sleeve 7 can absorb the temperature of the gas entering the sealing structure 2 , thereby protecting the sealing structure, especially the flexible sealing member 26 .

[0083] The installation sequence of the sealing structure follows the installation sequence from inside to outside.

[0084] In this embodiment, the elastic sliding connection is noted:

[0085] The balancing ring 27 is elastically and slidably connected to the inner wall of the housing 21;

[0086] See also Figure 3 and Figure 4 The outer wall of the balance ring 27 is slidably connected to the axial inner wall of the shell 21 along the axial direction of the rotary kiln body 9, and an elastic member is provided between the balance ring 27 and the shell 21, and the elastic member has an axial contraction direction consistent with the axial direction of the rotary kiln body 9;

[0087] The fastening block 33 is elastically and slidably connected to the bracket 31:

[0088] See also Figure 3 and Figure 6 The outer walls of the fastening block 33 and the adjusting member 37 are slidably connected to the inner wall of the bracket 31 along the radial direction of the rotary kiln body 9, and an adjusting spring 36 is provided between the fastening block 33 and the bracket 31. The expansion and contraction direction of the adjusting spring 36 is consistent with the radial direction of the rotary kiln body 9, and the two ends of the adjusting spring 36 are respectively installed between the fastening block 33 and the adjusting member 37;

[0089] The trigger member 34 is elastically slidably disposed on the side wall of the bracket 31:

[0090] See also Figure 3A slide rod is fixed on the bracket 31, and the trigger member 34 is slidably arranged with the bracket 31 through the slide rod. Each trigger member 34 is slidably arranged with the bracket 31 through a slide rod. An elastic member is also provided between the trigger member 34 and the bracket 31, and the expansion and contraction direction of the elastic member is consistent with the axial direction of the rotary kiln body 9;

[0091] The elastic sliding connection includes but is not limited to the above embodiments.

Claims

1. A rotary kiln with a flexible labyrinth-type sealing structure, comprising a rotary kiln body (9) and a smoke chamber shell (1), and a sealing structure (2) installed between the rotary kiln body (9) and the smoke chamber shell (1), characterized in that: The sealing structure (2) comprises: an outer shell (21) fixedly mounted on the smoke chamber shell (1), and a supporting flange (22) fixedly connected to the rotary kiln body (9); the supporting flange (22) is rotatably mounted relative to the outer shell (21); and a friction sleeve (23) having an end portion extending into the inner portion of the outer shell (21) is fixedly mounted on an outer wall of the supporting flange (22); The sealing structure (2) further comprises: A movable labyrinth ring (24) and a fixed labyrinth ring (25), wherein the movable labyrinth ring (24) is mounted on one end of the friction sleeve (23) extending into the housing (21), and the fixed labyrinth ring (25) is fixed to one end of the housing (21) close to the friction sleeve (23); A flexible sealing member (26) is fixed to the end of the housing (21) on one side and pressed against the side wall of the friction sleeve (23) on the other side; A balancing ring (27) is elastically and slidably connected to the inner wall of the housing (21); A balancing column (28) is fixed on the side wall of the balancing ring (27) and is used to keep the distance between the balancing ring (27) and the movable labyrinth ring (24) unchanged when the rotary kiln body (9) is axially extended; An adjustment assembly (3) capable of reducing pressure on the flexible seal (26) according to the movement distance of the balance ring (27); The regulating component (3) comprises: The bracket (31) and the hollow mounting frame (32) are both fixedly mounted on the outside of the housing (21), and the hollow mounting frame (32) is used to fix the flexible sealing member (26); Fastening blocks (33) are arranged in a circumferential array outside the flexible sealing member (26) and are all elastically slidably connected to the bracket (31); A trigger member (34) is elastically slidably arranged on the side wall of the bracket (31) and is used to adjust the elastic force between the fastening block (33) and the bracket (31); the trigger member (34) is fixedly connected to an adjustment spring (36), and the adjustment spring (36) is fixedly connected to an adjustment member (37) slidably arranged with the bracket (31); an adjustment pin (38) is fixedly provided on the side wall of the adjustment member (37); the trigger member (34) is fixedly provided with a trigger angle (39), and the trigger angle (39) is provided with an adjustment slot (30) for driving the adjustment pin (38) to rise and fall; A crossbar (35) is fixed to the end of the trigger member (34); The transmission member (4) synchronously drives the trigger member (34) to move according to the moving distance of the balance ring (27), so as to adjust the elastic force between the fastening block (33) and the bracket (31); The transmission member (4) comprises: A transmission rod (41) is rotatably disposed in the housing (21) and is slidably disposed with the balance ring (27); A driving groove (42) and a driving pin (43), wherein the driving groove (42) is formed on a side wall of the transmission rod (41), and the driving pin (43) is fixed on the balance ring (27); A driving wheel (44) and a driven wheel (45) are both rotatably mounted in a hollow mounting frame (32), the driving wheel (44) being fixed to the end of a transmission rod (41), and a driving ring (46) for transmission being provided between the driving wheel (44) and the driven wheel (45); A rocker (47) is rotatably disposed outside the flexible seal (26), with its end portion in contact with the crossbar (35); The connecting member (48) passes through the flexible sealing member (26), and its two ends are respectively connected to the driven wheel (45) and the rocker (47).

2. The rotary kiln with a flexible labyrinth seal structure according to claim 1, characterized in that: The transmission rod (41), the driving wheel (44), the driven wheel (45), the rocker (47), the cross bar (35) and the trigger member (34) are all in a plurality and are arranged in a circular array on both sides of the flexible seal (26); a cavity (5) for mounting the driving wheel (44), the driven wheel (45) and the rocker (47) is provided in the hollow mounting frame (32); the rocker (47) is tilted, and when the rocker (47) rotates, it can gradually press the flexible seal (26), thereby increasing the pressure between the flexible seal (26) and the hollow mounting frame (32).

3. The rotary kiln with a flexible labyrinth seal structure according to claim 1, characterized in that: A material lifting spoon (6) is fixedly provided on the side wall of the supporting flange (22), and the material lifting spoon (6) is a U-shaped structure. A material blocking sleeve (7) is fixedly provided on the inner side of the outer shell (21), and the end of the material blocking sleeve (7) is flush with the inner end surface of the material lifting spoon (6).

4. The rotary kiln with a flexible labyrinth seal structure according to claim 1, characterized in that: The flexible seal (26) is made of high-temperature-resistant and wear-resistant toughness steel mesh inside and outside, and the middle of the flexible seal (26) is made of flexible graphite fiber.

5. The rotary kiln with a flexible labyrinth seal structure according to claim 3, characterized in that: A heat insulation board (8) is fixedly provided on the inner side of the material blocking sleeve (7), and the heat insulation board (8) comprises a heat-insulating layer and a high-temperature-resistant layer.

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