A sealing device for an ore sintering machine

Abstract

This invention discloses a sealing device for an ore sintering machine, comprising a frame, a top cover, a support platform, and a sintering car. The beneficial effects of this invention are: the close contact between friction plate I and friction pad II allows for a tight connection between the top cover and the side wall of the sintering car; the first adjusting spring plate pushes the lower fixed angle iron to always keep friction pad II in close contact with friction pad I, preventing friction pad II from separating from friction pad I during sintering car movement and vibration; the adjusting spring plate pushes the lower friction strip to press against the bottom friction plate; and the transverse spring plate pushes the other side of the sliding angle iron plate to always press against the side of the lower friction strip, ensuring a sealed state between the sintering car and the lower rectangular support pipe during lateral vibration; and the sealing blade, pushed by the blade spring plate, presses against the air chamber sealing plate for sealing and sliding, allowing hot air in the air chamber to flow upwards into the sintering car as it passes through the air chamber sealing plate.

Description

Technical Field

[0001] This invention relates to the field of ore sintering vehicle technology, and specifically to a sealing device for an ore sintering machine. Background Technology

[0002] The sintering machine is suitable for sintering operations in large ferrous metallurgical sintering plants. It is the main equipment in the exhaust sintering process. When the sintering machine is running, the material needs to be transported into the sintering machine through the sintering car. When the sintering car is running in the sintering machine, it is easy to cause insufficient sealing between the sintering machine and the sintering car. This causes hot air in the sintering car to flow out from the bottom of the sintering car or between the side walls of the sintering car, resulting in heat waste. In addition, the discharged hot air can also easily cause danger. Summary of the Invention

[0003] The purpose of this invention is to provide a sealing device for an ore sintering machine to overcome the shortcomings of the prior art mentioned in the background section.

[0004] This invention discloses a sealing device for an ore sintering machine, comprising a frame 1, a top cover 2, a support platform 3, and a sintering car 4;

[0005] The frame 1 is provided with support platforms 3 on both sides, and the support platforms 3 are provided with top covers 2;

[0006] The support platform 3 is provided with an upper support plate 5 on one side, and the bottom of the top cover 2 is connected to the upper support plate 5.

[0007] The upper support plate 5 is provided with an upper fixed angle iron plate 6 at its lower part, and the upper fixed angle iron plate 6 is provided with a friction plate I 7 at its lower part;

[0008] The top cover 2 is provided with a sintering car 4 at its lower part, and the sintering car 4 is provided with trolley sidewalls 8 on both sides;

[0009] The trolley sidewall 8 is provided with a sidewall platform 9 on the outside, and a lower fixed angle iron 10 is provided on one side of the sidewall platform 9. A friction plate II 11 is provided on the upper part of the lower fixed angle iron 10.

[0010] The upper part of the lower fixed angle iron 10 is bent toward the upper part of the side wall platform 9, and a first adjusting spring plate 12 is provided between the lower fixed angle iron 10 and the upper part of the side wall platform 9.

[0011] The friction plate I7 ​​and the friction plate II11 are connected by frictional contact.

[0012] Preferably, rectangular support tubes 13 are provided on both sides of the lower part of the sintering car 4;

[0013] The sintering car 4 is provided with lower friction strips 14 on both sides of its lower part;

[0014] The lower friction strip 14 is provided with bolt holes 15, and the bolt holes 15 are provided with limiting holes 16. A plug bolt 17 passes through the limiting hole 16. The bottom of the plug bolt 17 is set in the bolt hole 15. The upper end of the plug bolt 17 is fixedly connected to the bottom of the sintering car 4. The lower friction strip 14 is slidably set on the plug bolt 17.

[0015] An adjusting spring plate 18 is provided between the lower friction strip 14 and the sintering car 4;

[0016] The lower friction strip 14 is provided with a sliding bolt 19 on its outer side. The upper end of the sliding bolt 19 is connected to the bottom of the sintering car 4. A sliding angle iron plate 20 is slidably provided on the upper part of the sliding bolt 19. A sliding adjustment spring 21 is sleeved on the lower part of the sliding bolt 19. The sliding adjustment spring 21 is pressed on the sliding angle iron plate 20.

[0017] The sliding angle iron plate 20 has an L-shaped structure. A transverse spring plate 22 is provided between the sliding adjusting spring 21 and the side of the sliding angle iron plate 20. The sliding angle iron plate 20 is pressed against the side of the lower friction strip 14.

[0018] The rectangular support tube 13 is provided with a bottom friction plate 23 on the upper part, and the bottom friction plate 23 is in frictional contact with the lower friction strip 14.

[0019] Preferably, the bottom of the sintering car 4 is provided with a plurality of car body frames 24 in a horizontal direction, and the car body frames 24 are arranged vertically.

[0020] The bottom of the trolley frame 24 is provided with a fixed slide plate 25, and a blade guard plate 26 is provided on one side of the fixed slide plate 25. The blade guard plate 26 has an n-shaped structure. A sealing blade 27 is slidably provided between the blade guard plates 26. The bottom of the sealing blade 27 extends out of the blade guard plate 26. A blade spring plate 28 is provided between the inside of the blade guard plate 26 and the upper part of the sealing blade 27.

[0021] Preferably, the lower friction strip 14 is composed of two segments: a first friction strip 29 and a second friction strip 30.

[0022] The first friction strip 29 and the second friction strip 30 are connected by a toothed meshing.

[0023] Preferably, the first friction strip 29 has a spring hole 31 inside one toothed end, and a meshing spring 32 is provided in the spring hole 31. The meshing spring 32 extends out of the spring hole 31 and contacts the second friction strip 30.

[0024] Preferably, the blade guard plate 26 is provided with a blade bolt 33, the blade bolt 33 passes through the sealing blade 27, the sealing blade 27 is provided with a sliding hole 34, and the blade bolt 33 passes through the sliding hole 34.

[0025] Preferably, ribs 35 are provided between the trolley frame 24, and notches for inserting the ribs 35 are provided on the cutter guard plate 26 and the sealing cutter body 27 respectively.

[0026] The upper part of the blade guard plate 26 is fixedly connected to the rib plate 35.

[0027] Preferably, the bottom of the rectangular support tube 13 is provided with an air chamber 36;

[0028] A plurality of air chamber sealing plates 37 are arranged in parallel between the air chambers 36, and a sealing friction plate 38 is provided on the air chamber sealing plate 37;

[0029] The sealing friction plate 38 is bent downwards on both sides;

[0030] The sealing friction plate 38 is in frictional contact with the sealing blade body 27.

[0031] The inner side of the trolley side wall 8 is provided with a heat insulation layer 39, and a number of metal blocks 40 are arranged side by side on the heat insulation layer 39.

[0032] The beneficial effects of this invention are:

[0033] 1. The close contact between friction plate I and friction plate II can make the top cover and the side wall of the trolley tightly connected. The first adjusting spring plate can push the fixed angle iron and friction plate II to always be in close contact with friction plate I, which can prevent friction plate II from separating from friction plate I when the sintering car moves and vibrates.

[0034] 2. By adjusting the spring plate, the lower friction strip can be pressed against the bottom friction plate. The transverse spring plate can push the other side of the sliding angle iron plate to always press against the side of the lower friction strip, so that the sintering car and the lower rectangular support tube can always be kept in a sealed state when the sintering car vibrates laterally.

[0035] 3. The sealing blade can be pressed against the air chamber sealing plate by the blade spring plate to seal and slide. This allows the hot air in the air chamber to flow upward into the sintering car when passing through the air chamber sealing plate. It can prevent the hot air from passing through the bottom of the sintering car and the air chamber sealing plate, thus preventing the hot air from being unable to enter the sintering car. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0037] Figure 2 This is a schematic diagram of part A of the present invention.

[0038] Figure 3 This is a schematic diagram of Part B of the present invention.

[0039] Figure 4 This is a schematic diagram of the main cross-sectional structure of the present invention.

[0040] Figure 5 This is a schematic diagram of part C of the present invention.

[0041] Figure 6 This is a side view cross-sectional structural diagram of the present invention.

[0042] Figure 7 This is a schematic diagram of part D of the present invention.

[0043] Figure 8 This is a schematic diagram of the sealing blade structure of the present invention.

[0044] Figure 9 This is a schematic diagram of the three-dimensional structure of the friction strip of the present invention.

[0045] Figure 10 This is a bottom view of the friction strip structure of the present invention.

[0046] Figure 11 This is a side view cross-sectional diagram of the friction strip structure of the present invention.

[0047] Figure 12 This is a schematic diagram of the front cross-sectional structure of the friction strip of the present invention.

[0048] Figure 13 This is a schematic diagram of the overall air chamber structure of the present invention.

[0049] Figure 14 This is a schematic diagram of part E of the present invention.

[0050] Legend: 1. Frame, 2. Top cover, 3. Support platform, 4. Sintering car, 5. Upper support plate, 6. Upper fixed angle iron plate, 7. Friction plate I, 8. Trolley side wall, 9. Side wall platform, 10. Lower fixed angle iron, 11. Friction plate II, 12. First adjusting spring plate, 13. Rectangular support tube, 14. Lower friction strip, 15. Bolt hole, 16. Limiting hole, 17. Plug bolt, 18. Adjusting spring plate, 19. Sliding bolt, 20. Sliding... 21. Angle iron plate, 22. Sliding adjusting spring, 23. Horizontal spring plate, 24. Bottom friction plate, 25. Trolley frame, 26. Fixed slide plate, 27. Blade body guard plate, 28. Sealed blade body, 29. Blade body spring plate, 30. First friction strip, 31. Second friction strip, 32. Spring hole, 33. Engaging spring, 34. Blade body bolt, 35. Sliding hole, 36. Rib plate, 37. Air chamber, 38. Air chamber sealing plate, 39. Sealing friction plate. Detailed Implementation

[0051] The following description, in conjunction with the accompanying drawings, provides a detailed account of specific embodiments of the present invention.

[0052] A sealing device for an ore sintering machine includes a frame 1, a top cover 2, a support platform 3, and a sintering car 4;

[0053] The frame 1 is provided with support platforms 3 on both sides, and the support platforms 3 are provided with top covers 2;

[0054] The support platform 3 is provided with an upper support plate 5 on one side, and the bottom of the top cover 2 is connected to the upper support plate 5.

[0055] The upper support plate 5 is provided with an upper fixed angle iron plate 6 at its lower part, and the upper fixed angle iron plate 6 is provided with a friction plate I 7 at its lower part;

[0056] The top cover 2 is provided with a sintering car 4 at its lower part, and the sintering car 4 is provided with trolley sidewalls 8 on both sides;

[0057] The trolley sidewall 8 is provided with a sidewall platform 9 on the outside, and a lower fixed angle iron 10 is provided on one side of the sidewall platform 9. A friction plate II 11 is provided on the upper part of the lower fixed angle iron 10.

[0058] The upper part of the lower fixed angle iron 10 is bent toward the upper part of the side wall platform 9, and a first adjusting spring plate 12 is provided between the lower fixed angle iron 10 and the upper part of the side wall platform 9.

[0059] Friction plate I 7 and friction plate II 11 are connected by frictional contact. The frame can support the top cover of the sintering machine, and the top cover can seal the upper part of the sintering car. The support platform can support the top cover. The side walls of the sintering car on both sides can be connected to the top cover to form a sealed space. The lower part of the top cover is sealed to the upper support plate. The upper support plate is sealed to the lower upper fixed angle iron plate. The upper fixed angle iron plate is sealed to friction plate I. The side wall platforms on the side walls of the sintering car can support the lower fixed angle iron plate. The lower fixed angle iron plate can slide up and down on the side wall platform. The lower fixed angle iron plate is sealed by the sealing plate of the side wall. Friction plate II on the lower fixed angle iron plate is sealed to friction plate I. Friction plate I and friction plate II are in frictional contact to seal the top cover and the side wall of the sintering car. The first adjusting spring plate can push the lower fixed angle iron and friction plate II to always be in close contact with friction plate I, which can prevent friction plate II and friction plate I from separating when the sintering car moves and vibrates, thereby sealing the sintering car and the top cover.

[0060] The sintering car 4 has rectangular support tubes 13 on both sides of its lower part;

[0061] The sintering car 4 is provided with lower friction strips 14 on both sides of its lower part;

[0062] The lower friction strip 14 is provided with bolt holes 15, and the bolt holes 15 are provided with limiting holes 16. A plug bolt 17 passes through the limiting hole 16. The bottom of the plug bolt 17 is set in the bolt hole 15. The upper end of the plug bolt 17 is fixedly connected to the bottom of the sintering car 4. The lower friction strip 14 is slidably set on the plug bolt 17.

[0063] An adjusting spring plate 18 is provided between the lower friction strip 14 and the sintering car 4;

[0064] The lower friction strip 14 is provided with a sliding bolt 19 on its outer side. The upper end of the sliding bolt 19 is connected to the bottom of the sintering car 4. A sliding angle iron plate 20 is slidably provided on the upper part of the sliding bolt 19. A sliding adjustment spring 21 is sleeved on the lower part of the sliding bolt 19. The sliding adjustment spring 21 is pressed on the sliding angle iron plate 20.

[0065] The sliding angle iron plate 20 has an L-shaped structure. A transverse spring plate 22 is provided between the sliding adjusting spring 21 and the side of the sliding angle iron plate 20. The sliding angle iron plate 20 is pressed against the side of the lower friction strip 14.

[0066] The rectangular support tube 13 has a bottom friction plate 23 on its upper part. The bottom friction plate 23 is in frictional contact with the lower friction strip 14. The rectangular support tube is set on the upper wall of the bottom air chamber of the sintering machine. The bottom friction plate on the rectangular support tube can be in frictional contact with the lower friction strip, which can form a sealed space between the bottom of the sintering car and the air chamber. The lower friction strip at the bottom of the sintering car is fixed to the bottom of the sintering car by a stop bolt. The stop bolt passes through the bolt hole of the lower friction strip, and the bottom of the stop bolt is inside the bolt hole. The limiting hole allows the stop bolt to pass through and prevents the stop bolt from detaching from the lower friction strip. The lower friction strip can be mounted on the stop bolt. The downward, left-right, forward-backward movement of the friction strip ensures a tight connection between the lower friction strip and the bottom friction plate during sintering car movement. The adjusting spring plate pushes the lower friction strip onto the bottom friction plate, ensuring a tight connection between them. The sliding bolt connects the sliding angle iron plate, and the sliding adjusting spring keeps the sliding angle iron plate pressed against the bottom of the sintering car. The transverse spring plate pushes the other side of the sliding angle iron plate against the side of the lower friction strip, keeping the lower friction strip and the bottom of the sintering car in a sealed state. This also ensures a sealed connection between the sintering car and the lower rectangular support tube during lateral vibration.

[0067] The bottom of the sintering car 4 is provided with several car body frames 24 arranged horizontally, and the car body frames 24 are arranged vertically.

[0068] The bottom of the trolley frame 24 is provided with a fixed sliding plate 25. A blade guard plate 26 is provided on one side of the fixed sliding plate 25. The blade guard plate 26 has an n-shaped structure. A sealing blade 27 is slidably disposed between the blade guard plates 26. The bottom of the sealing blade 27 extends out of the blade guard plate 26. A blade spring plate 28 is provided between the inside of the blade guard plate 26 and the upper part of the sealing blade 27. The trolley frame can support the sintering material and connect the sintering car to the air chamber at the bottom of the sintering car, allowing hot air to circulate within the sintering car. An air chamber sealing plate is provided at the bottom of the air chamber and is located inside the air chamber. The air chamber sealing plate is equipped with a sealing friction plate, which is at the same height as the upper wall of the air chamber. This plate can change the direction of hot air. The fixed slide plate can remove impurities from the sealing friction plate. The blade guard plate can hold the sealing blade, which can slide up and down inside the blade guard plate. The blade spring plate can push the sealing blade, which can press against the sealing friction plate on the air chamber sealing plate and slide in a sealing manner. This allows the hot air in the air chamber to flow upwards into the sintering car as it passes through the air chamber sealing plate, preventing hot air from passing through the bottom of the sintering car and the air chamber sealing plate, thus preventing hot air from being unable to enter the sintering car.

[0069] The lower friction strip 14 is composed of two sections: a first friction strip 29 and a second friction strip 30.

[0070] The first friction strip 29 and the second friction strip 30 are connected by a toothed meshing connection. The toothed end of the first friction strip 29 is provided with a spring hole 31. The spring hole 31 is provided with a meshing spring 32. The meshing spring 32 extends out of the spring hole 31 and contacts the second friction strip 30. The first friction strip and the second friction strip form a lower friction strip. The first friction strip and the second friction strip can be separated by the pushing action of the meshing spring in the spring hole. When multiple sintering cars are connected, the first friction strip and the second friction strip are squeezed together. The first friction strip and the second friction strip compress the meshing spring in the middle. The first friction strip and the second friction strip are connected by a toothed meshing connection, which can make the first friction strip and the second friction strip form a complete sealed state.

[0071] The blade guard plate 26 is provided with a blade bolt 33, which passes through the sealing blade 27. The sealing blade 27 is provided with a sliding hole 34, through which the blade bolt 33 passes. The sealing blade can slide up and down on the blade bolt. The blade bolt can also limit the sliding distance of the sealing blade. A sliding bearing is also installed between the blade bolt and the sliding hole to increase the sliding flexibility of the sealing blade.

[0072] Ribs 35 are provided between the trolley frame 24, and notches for inserting the ribs 35 are provided on the cutter body guard plate 26 and the sealing cutter body 27 respectively.

[0073] The upper part of the cutter body guard plate 26 is fixedly connected to the rib plate 35. The rib plate can support the trolley frame and can also be locked in the notch on the cutter body guard plate. The rib plate can stabilize the cutter body guard plate and seal the notch on the cutter body to prevent the rib plate from blocking the sealed cutter body when it retracts.

[0074] The bottom of the rectangular support tube 13 is provided with an air chamber 36;

[0075] A plurality of air chamber sealing plates 37 are arranged in parallel between the air chambers 36, and a sealing friction plate 38 is provided on the air chamber sealing plate 37;

[0076] The sealing friction plate 38 is bent downwards on both sides;

[0077] The sealing friction plate 38 is in frictional contact with the sealing blade 27, allowing hot air to circulate within the air chamber. As the air flows through the air chamber sealing plate, it enters the upper sintering car. The hot air heats and dries the material inside the sintering car. After entering the sintering car and bypassing the air chamber sealing plate, some of the hot air enters the air chamber on the other side of the air chamber sealing plate and is discharged from the other side. Multiple air chamber sealing plates allow the air inside the air chamber to circulate and be heated within the sintering car. The sealing friction plate can easily form a sealing partition by frictional connection with the sealing blade. The downward bending of the sealing friction plate facilitates the passage of the sealing blade through the sealing friction plate.

[0078] The inner side of the trolley sidewall 8 is provided with a heat insulation layer 39, on which a number of metal blocks 40 are arranged side by side. The metal blocks can support the ore and prevent the ore from wearing the heat insulation layer. The side by side arrangement of the metal blocks on the heat insulation layer can form gaps between the metal blocks, allowing hot air to enter the gaps to heat the ore connected to the metal blocks, preventing incomplete heating of the ore. The heat insulation layer can separate the ore from the trolley sidewall, preventing direct contact between the ore and the trolley sidewall. It can also prevent the thermal conductivity of the metal of the trolley sidewall from lowering the temperature of the ore on the trolley sidewall, thus preventing the problem of high temperature in the middle of the sintering car and low temperature of the ore on the sidewall. The heat insulation layer can increase the heat insulation of the trolley sidewall and improve the yield of sintered ore near the trolley sidewall.

[0079] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present invention, and these improvements and substitutions are all considered to be within the protection scope of the present invention.

Claims

1. A sealing device for an ore sintering machine, characterized in that, It includes the frame (1), the top cover (2), the support platform (3) and the sintering car (4); The frame (1) is provided with support platforms (3) on both sides, and the support platforms (3) are provided with top covers (2). The support platform (3) is provided with an upper support plate (5) on one side, and the bottom of the top cover (2) is connected to the upper support plate (5); The upper support plate (5) is provided with an upper fixed angle iron plate (6) at the lower part, and the upper fixed angle iron plate (6) is provided with a friction plate I (7) at the lower part. The top cover (2) is provided with a sintering car (4) at the bottom, and the sintering car (4) is provided with trolley sidewalls (8) on both sides. The trolley sidewall (8) is provided with a sidewall platform (9) on the outside, and a lower fixed angle iron (10) is provided on one side of the sidewall platform (9). A friction plate II (11) is provided on the upper part of the lower fixed angle iron (10). The upper part of the lower fixed angle iron (10) bends towards the upper part of the side wall platform (9), and a first adjusting spring plate (12) is provided between the lower fixed angle iron (10) and the upper part of the side wall platform (9). The friction plate I (7) and the friction plate II (11) are connected by frictional contact; The lower part of the top cover (2) is sealed to the upper support plate (5), the upper support plate (5) is sealed to the lower upper fixed angle iron plate (6), the upper fixed angle iron plate (6) is sealed to the friction plate I (7), the side wall platform (9) on the trolley side wall (8) on both sides of the sintering car (4) can support the lower fixed angle iron (10), and the lower fixed angle iron (10) can slide up and down on the side wall platform (9); The first adjusting spring plate (12) can push the lower fixed angle iron (10) and friction plate II (11) to always be in close contact with friction plate I (7); The sintering car (4) has rectangular support tubes (13) on both sides of its lower part. The sintering car (4) is provided with lower friction strips (14) on both sides of the lower part. The lower friction strip (14) is provided with bolt holes (15), and the bolt holes (15) are provided with limiting holes (16). A plug bolt (17) passes through the limiting hole (16), and the bottom of the plug bolt (17) is set in the bolt hole (15). The upper end of the plug bolt (17) is fixedly connected to the bottom of the sintering car (4), and the lower friction strip (14) is slidably set on the plug bolt (17). An adjusting spring plate (18) is provided between the lower friction strip (14) and the sintering car (4). The lower friction strip (14) is provided with a sliding bolt (19) on the outside. The upper end of the sliding bolt (19) is connected to the bottom of the sintering car (4). A sliding angle iron plate (20) is slidably provided on the upper part of the sliding bolt (19). A sliding adjustment spring (21) is sleeved on the lower part of the sliding bolt (19). The sliding adjustment spring (21) is pressed on the sliding angle iron plate (20). The sliding angle iron plate (20) has an L-shaped structure. A transverse spring plate (22) is provided between the sliding adjustment spring (21) and the side of the sliding angle iron plate (20). The sliding angle iron plate (20) is pressed against the side of the lower friction strip (14). The rectangular support tube (13) is provided with a bottom friction plate (23) at the top, and the bottom friction plate (23) is in frictional contact with the lower friction strip (14); The inner side of the trolley sidewall (8) is provided with a heat insulation layer (39), and a number of metal blocks (40) are arranged side by side on the heat insulation layer (39).

2. The sealing device for an ore sintering machine according to claim 1, characterized in that, The bottom of the sintering car (4) is provided with several car body frames (24) arranged horizontally, and the car body frames (24) are arranged vertically. The bottom of the trolley frame (24) is provided with a fixed slide plate (25), and a blade guard plate (26) is provided on one side of the fixed slide plate (25). The blade guard plate (26) has an n-shaped structure. A sealing blade (27) is slidably provided between the blade guard plates (26). The bottom of the sealing blade (27) extends out of the blade guard plate (26). A blade spring plate (28) is provided between the inside of the blade guard plate (26) and the upper part of the sealing blade (27).

3. The sealing device for an ore sintering machine according to claim 1, characterized in that, The lower friction strip (14) is composed of two sections: a first friction strip (29) and a second friction strip (30). The first friction strip (29) and the second friction strip (30) are connected by toothed engagement.

4. The sealing device for an ore sintering machine according to claim 3, characterized in that, The first friction strip (29) has a spring hole (31) inside one toothed end, and a meshing spring (32) is provided inside the spring hole (31). The meshing spring (32) extends out of the spring hole (31) and contacts the second friction strip (30).

5. A sealing device for an ore sintering machine according to claim 2, characterized in that, The blade guard plate (26) is provided with a blade bolt (33), which passes through the sealing blade (27). The sealing blade (27) is provided with a sliding hole (34), through which the blade bolt (33) passes.

6. A sealing device for an ore sintering machine according to claim 2, characterized in that, Ribs (35) are provided between the trolley frame (24), and notches for inserting the ribs (35) are provided on the cutter guard plate (26) and the sealing cutter body (27); The upper part of the blade guard plate (26) is fixedly connected to the rib plate (35).

7. The sealing device for an ore sintering machine according to claim 1, characterized in that, The bottom of the rectangular support tube (13) is provided with an air chamber (36); A plurality of air chamber sealing plates (37) are arranged in parallel between the air chambers (36), and a sealing friction plate (38) is provided on the air chamber sealing plate (37). The sealing friction plate (38) is bent downwards on both sides; The sealing friction plate (38) is in frictional contact with the sealing blade body (27).

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