A supporting rod sealing device for a variable-load medium-speed coal mill in a coal-fired power plant

Abstract

The present invention discloses a support rod sealing device for a variable-load medium-speed coal mill in a coal-fired power plant. The device relates to the field of coal mills and includes a frame and a pull rod. An upper roller is connected to the upper end of the frame, and multiple groups of lower rollers are connected below the upper rollers via lower roller brackets with complementary projected areas. Ratchets are fixedly connected to both ends of the roller shaft within the upper and lower roller brackets. An annular corrugated rubber sheet is sealedly connected to the top of the corrugated rubber sheet mounting bracket at the corresponding position of the pull rod. An antimony-impregnated carbon sealing ring in close contact with the pull rod is provided within the lower end of the frame. An airbag ring is provided on the frame in a direction away from the antimony-impregnated carbon sealing ring. A pressure probe is provided within the airbag ring, and the pressure probe is connected to a pressure gauge located outside the frame via a wire. The present invention ensures the sealing performance of the sealing device while extending its service life, reducing environmental pollution and greatly facilitating maintenance of the sealing device.

Description

Technical Field

[0001] The invention relates to the field of coal mills, and in particular to a supporting rod sealing device for a variable-load medium-speed coal mill in a coal-fired power plant. Background Art

[0002] Medium-speed coal mills are suitable for grinding medium-hardness materials such as bituminous coal and lean coal into powder. They can be widely used in pulverizing systems in the power, metallurgy, building materials, chemical and other industries, especially in blast furnace coal injection pulverizing systems that require a large amount of bituminous coal. Currently, most power plants in the country use variable-load medium-speed coal mills.

[0003] In the operation of the existing variable-load medium-speed coal mill, the support rod and tie rod seal of the variable-load medium-speed coal mill moves up and down due to the coal mill grinding coal blocks, and will also vibrate laterally when the load is large, and the support rod seal often leaks powder and ash. When the ash leakage problem occurs, the maintenance time is long, which affects the power of the generator set. The coal mill cannot be stopped for maintenance in time, which poses a certain risk to the operation of the unit. Due to the entry of coal slag, the support rod of the high-speed coal mill is easily worn, shortening the service life of the support rod and polluting the on-site working environment. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a support rod sealing device for a variable-load medium-speed coal mill in a coal-fired power plant, so as to solve the technical problems that the existing variable-load medium-speed coal mill often leaks powder and ash from the support rod seal, cannot provide timely warning and stop for maintenance before the problem occurs, has a short service life and pollutes the on-site working environment.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a supporting pull rod sealing device for a variable-load medium-speed coal mill in a coal-fired power plant, comprising a frame and a pull rod, the upper end of the frame is connected to a drum frame, the center of the top end of the drum frame is connected to an annular upper drum through an upper drum bracket, and multiple groups of lower drums are connected below the upper drum with complementary projection areas through lower drum brackets, a drum shaft is provided in both the upper drum and the lower drum, the drum shaft is rotatably connected to the upper drum bracket and the lower drum bracket on both sides, ratchets are fixedly connected at both ends of the drum shaft in the upper drum bracket and the lower drum bracket, a ratchet fixing plate is slidably connected to the inside of the upper drum bracket and the lower drum bracket, the ratchet fixing plate is provided with ratchets that cooperate with the ratchet, and springs are provided on both sides of the ratchet fixing plate. A corrugated rubber sheet mounting frame is provided inside the drum frame facing the pull rod, and a ring-shaped corrugated rubber sheet is sealedly connected to the top of the corrugated rubber sheet mounting frame at the corresponding position of the pull rod, and a lower magnet is provided on the corrugated rubber sheet near one end of the pull rod, and an upper magnet is provided on the inner wall of the drum frame at the corresponding position above the lower magnet. When the pull rod moves upward to the limit position, the upper magnet and the lower magnet are just attracted, and an inclined annular dust landslide is provided on the edge of the inner wall of the drum frame, and a dust outlet is provided at the bottom of the lowest end of the dust landslide, and an antimony-impregnated carbon sealing ring in close contact with the pull rod is provided inside the lower end of the frame, and an air bag ring is provided on the frame in the direction of the antimony-impregnated carbon sealing ring away from the pull rod, and an air pressure probe is provided in the air bag ring, and the air pressure probe is connected to a pressure gauge arranged on the outside of the frame through a wire.

[0006] By adopting the above technical solution, dust is prevented from sliding down along the pull rod, thereby ensuring the sealing performance of the sealing device and extending the service life of the sealing device, reducing pollution to the environment, and greatly facilitating the maintenance of the sealing device.

[0007] The present invention is further configured such that the bottom ends of the upper roller bracket and the lower roller bracket are both provided with a limiting rod, and the bottom end of the ratchet fixing plate is provided with a sliding groove that cooperates with the limiting rod.

[0008] By adopting the above technical solution, the limiting rod cooperates with the sliding groove so that the ratchet fixing plate can only slide horizontally.

[0009] The present invention is further configured such that both ends of the corrugated rubber sheet are clamped in the mounting grooves, the mounting grooves are respectively fixed to the outer wall of the pull rod and the inner wall of the top end of the corrugated rubber sheet mounting frame, the top end of the mounting groove is connected to a mounting cover plate, a clamping plate is provided in the mounting groove toward the direction of the corrugated rubber sheet connecting foot, and the mounting cover plate and the mounting groove are both provided with clamping screws that contact the clamping plate.

[0010] By adopting the above technical solution, the compression screw cooperates with the compression plate to compress the corrugated rubber sheet, thereby ensuring the sealing performance at the edge of the corrugated rubber sheet.

[0011] The present invention is further configured such that the airbag ring is connected to the airbag ring interface on the outer wall of the frame via an air tube.

[0012] By adopting the above technical solution, air is inflated into the airbag ring through the airbag ring interface.

[0013] The present invention is further configured such that a hydraulic rod is provided on the airbag ring away from the pull rod.

[0014] By adopting the above technical solution, the hydraulic rod presses the airbag ring toward the pull rod.

[0015] The present invention is further configured such that the tail end of the hydraulic rod is connected to a hydraulic rod interface arranged outside the frame through a connecting pipe.

[0016] By adopting the above technical solution, the hydraulic pump is connected through the hydraulic rod interface to control the movement of the hydraulic rod.

[0017] The present invention is further configured such that three groups of upper rollers and three groups of lower rollers are provided.

[0018] By adopting the above technical solution, multiple groups of upper rollers and lower rollers with complementary projected areas ensure that most of the dust will not continue to fall.

[0019] The present invention is further configured such that an observation window is provided at the top of the roller frame.

[0020] By adopting the above technical solution, the situation inside the sealing device can be easily observed through the observation window, which makes it easier to determine the maintenance time.

[0021] The present invention is further configured such that the ratchet is rotatably connected to the ratchet fixing plate, the ratchet is connected to a spring at the lower end, and the elastic force direction of the spring is opposite to the rotation direction of the ratchet.

[0022] By adopting the above technical solution, it is ensured that the upper roller and the lower roller can only rotate when the pull rod moves upward.

[0023] The present invention is further configured such that the upper roller, the lower roller and the antimony-impregnated carbon sealing ring are all tightly fitted to the pull rod.

[0024] By adopting the above technical solution, dust can be prevented from sliding down the pull rod and causing environmental pollution.

[0025] In summary, the present invention mainly has the following beneficial effects:

[0026] The present invention provides multiple sets of ring-shaped cleaning rollers at the top of the pull rod. The rollers are arranged in two layers, upper and lower, which complement each other in projected area. Ratchets and springs are provided at both ends of the roller shafts to ensure that the rollers are always in close contact with the pull rod and do not rotate when the pull rod slides downward. They rotate when the pull rod slides upward. During the rotation, the dust falling along the pull rod is cleaned in the opposite direction so that it does not continue to slide down along the pull rod. The springs ensure that the rollers are in close contact with the pull rod when the pull rod vibrates during operation, preventing dust from sliding down along the pull rod.

[0027] The present invention provides an annular corrugated rubber sheet, and uses a compression screw and a compression sheet at the edge of the annular corrugated rubber sheet to ensure the sealing of the connection at the edge of the corrugated rubber sheet, so that the corrugated rubber sheet can be tensioned or contracted as the pull rod moves up and down. When the corrugated rubber sheet rises to the limit position, the permanent magnets connected to the inner wall of the frame and the corrugated rubber sheet attract each other, causing the corrugated rubber sheet to instantly increase its inclination angle and generate vibration, so that the dust accumulated at the upper end slides out of the outlet along the annular inclined dust landslide, thereby ensuring the sealing performance of the sealing device while extending the service life of the sealing device and reducing pollution to the environment.

[0028] The present invention extends the service life of the sealing device by using an antimony-impregnated carbon sealing ring. A sealing airbag ring pushed by a hydraulic rod is provided on the outside of the antimony-impregnated carbon sealing ring. The airbag ring is used to press the antimony-impregnated carbon sealing ring against the pull rod, further enhancing the sealing performance of the sealing device. At the same time, when the pull rod vibrates, the sealing airbag ring can absorb the lateral vibration generated by the pull rod, thereby avoiding the formation of gaps during vibration.

[0029] The present invention provides an air pressure needle in the airbag ring, and the working condition of the sealing device can be easily understood by observing the air pressure gauge, so that problems of the sealing device can be discovered in time, and whether the sealing device needs to be repaired can be accurately judged before dust leakage occurs, which greatly facilitates the maintenance of the sealing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a front view of the interior of the present invention;

[0031] Figure 2 For the present invention Figure 1 A magnified view of middle A;

[0032] Figure 3 For the present invention Figure 2 Enlarged view of middle C;

[0033] Figure 4 For the present invention Figure 1 Enlarged view of middle B;

[0034] Figure 5 This is a front view of the interior of the roller frame of the present invention;

[0035] Figure 6 A top view of the upper drum of the present invention;

[0036] Figure 7 A top view of the lower drum of the present invention;

[0037] Figure 8 This is a side view of the lower drum of the present invention;

[0038] Figure 9 For the present invention Figure 8 The enlarged view of D in the middle;

[0039] Figure 10 This is a top view of the lower roller bracket of the present invention.

[0040] In the figure: 1. Frame; 2. Pull rod; 3. Roller frame; 4. Upper roller bracket; 5. Lower roller bracket; 6. Upper roller; 7. Lower roller; 8. Roller shaft; 9. Ratchet; 10. Ratchet; 11. Ratchet fixing plate; 12. Slide; 13. Limit rod; 14. Spring; 15. Observation window; 16. Dust slide; 17. Dust outlet; 18. Corrugated rubber sheet mounting bracket; 19. Mounting groove; 20. Mounting cover; 21. Clamping screw; 22. Clamping plate; 23. Corrugated rubber sheet; 24. Lower magnet; 25. Upper magnet; 26. Hydraulic rod interface; 27. Hydraulic rod; 28. Air bag ring interface; 29. ​​Air bag ring; 30. Air pressure probe; 31. Pressure gauge; 32. Antimony-impregnated carbon sealing ring. DETAILED DESCRIPTION

[0041] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0042] The following describes an embodiment of the present invention based on its overall structure.

[0043] A supporting rod sealing device for a medium-speed coal mill with variable loading in a coal-fired power plant, such as Figure 1-10As shown, it includes a frame 1 and a pull rod 2. The upper end of the frame 1 is connected to a roller frame 3. The center of the top of the roller frame 3 is connected to an annular upper roller 6 through an upper roller bracket 4, and multiple groups of lower rollers 7 are connected below the upper roller 6 with complementary projection areas through a lower roller bracket 5. A roller shaft 8 is provided in both the upper roller 6 and the lower roller 7. The roller shaft 8 is rotatably connected to the upper roller bracket 4 and the lower roller bracket 5 on both sides. Ratchets 9 are fixedly connected to both ends of the roller shaft 8 in the upper roller bracket 4 and the lower roller bracket 5. A ratchet fixing plate 11 is slidably connected to the upper roller bracket 4 and the lower roller bracket 5. A ratchet fixing plate 11 is provided on the ratchet fixing plate 11, and a ratchet 10 that cooperates with the ratchet 9 is provided on both sides of the ratchet fixing plate 11. The dust moves along the pull rod 4. When the upper end of the rod 2 slides down and the pull rod 2 moves downward, the ratchet 9 fixedly connected to the roller shaft 8 is limited by the ratchet 10 and cannot rotate. The upper roller 6 and the lower roller 7 slide and rub against the pull rod 2. At this time, the dust accumulates between the upper roller 6 and the pull rod 2 and the lower roller 7 and the pull rod 2. When the pull rod 2 moves upward, the friction between the upper roller 6 and the lower roller 7 causes the upper roller 6 and the lower roller 7 to rotate. The upper roller 6 and the lower roller 7 rotate in the direction of the pull rod 2 to discharge the previously accumulated dust, so as to achieve the purpose of isolating most of the dust from continuing to slide under the pull rod 2. The limit rod 13 limits the rotation of the ratchet fixed disk 11. When the pull rod 2 vibrates laterally, the ratchet fixed disk 11 can slide laterally. At this time, the limit rod 13 slides in the slide groove 12, and the ratchet fixed disk 11 is limited. The elastic force of the springs 14 on both sides can generate displacement to offset the displacement of the vibration of the pull rod 2, ensuring that the upper roller 6 and the lower roller 7 are close to the pull rod 2. A corrugated rubber sheet mounting frame 18 is provided inside the roller frame 3 facing the pull rod 2. The top of the corrugated rubber sheet mounting frame 18 is sealed with an annular corrugated rubber sheet 23 at the corresponding position of the pull rod 2. The corrugated rubber sheet 23 is provided with a lower magnet 24 near one end of the pull rod 2. An upper magnet 25 is provided on the inner wall of the roller frame 3 at the corresponding position above the lower magnet 24. When the pull rod 2 moves upward to the limit position, the upper magnet 25 and the lower magnet 24 are just attracted. An inclined annular dust landslide 16 is provided on the inner edge of the roller frame 3. A dust outlet 17 is provided at the bottom of the lowest end of the dust landslide 16. The corrugated rubber sheet 23 is installed in the mounting groove 1 9, cover and install the cover plate 20, use the tightening screw 21 to squeeze the tightening plate 22 to ensure the sealing performance at the edge of the corrugated rubber sheet 23. The corrugated rubber sheet 23 can be tensioned or contracted as the pull rod 2 rises or falls, and the sealing performance is always maintained. When the pull rod 2 rises to the limit position, the upper magnet 25 and the lower magnet 24 are instantly attracted to each other, so that the corrugated rubber sheet 23 instantly increases the tilt angle, and the dust accumulated on the corrugated rubber sheet 23 bounces toward the annular inclined dust landslide 16, slides along the dust landslide 16 to the lowest point of the dust landslide 16, and is discharged from the dust outlet 17, avoiding excessive accumulation of dust in the sealing device and extending the service life of the device. The interior of the lower end of the frame 1 is provided with an antimony-impregnated carbon fine sealing ring 32 that is in close contact with the pull rod 2.Frame 1 is equipped with an airbag ring 29 on the direction away from the tie rod 2 from the antimony-impregnated carbon fine sealing ring 32. A pressure probe 30 is installed inside the airbag ring 29. The pressure probe 30 is connected to a pressure gauge 31 installed on the outside of frame 1 via a wire. The hydraulic rod 27 presses the airbag ring 29 against the antimony-impregnated carbon fine sealing ring 32, making it close to the outer wall of the tie rod 2. At the same time, when the tie rod 2 vibrates, the airbag ring 29 can be deformed, so that the antimony-impregnated carbon fine sealing ring 32 always remains close to the outer wall of the tie rod 2, preventing dust leakage. The pressure gauge 31 outside the frame 1 can intuitively understand the air pressure inside the airbag ring 29 through the pressure probe 30. When the air pressure is low, it indicates that there is a problem with the sealing device. The sealing device can be repaired at an appropriate time before dust leakage occurs, preventing dust leakage from affecting normal production.

[0044] See also Figure 9 and Figure 10 The bottom ends of the upper roller bracket 4 and the lower roller bracket 5 are both provided with a limit rod 13, and the bottom end of the ratchet fixed plate 11 is provided with a slide groove 12 that cooperates with the limit rod 13. The limit rod 13 cooperates with the slide groove so that the ratchet fixed plate 11 can only slide horizontally.

[0045] See also Figure 2 An observation window 15 is provided at the top of the roller frame 3, through which the situation inside the sealing device can be easily observed, making it easier to determine the maintenance time.

[0046] See also Figure 3 Both ends of the corrugated rubber sheet 23 are stuck in the mounting groove 19, and the mounting groove 19 is respectively fixed to the outer wall of the pull rod 2 and the inner wall of the top of the corrugated rubber sheet mounting frame 18. The top of the mounting groove 19 is connected to the mounting cover 20, and a clamping plate 22 is provided in the mounting groove 19 toward the direction of the connecting foot of the corrugated rubber sheet 23. The mounting cover 20 and the mounting groove 19 are both provided with a clamping screw 21 that contacts the clamping plate 22. The clamping screw 21 cooperates with the clamping plate 22 to clamp the corrugated rubber sheet 23, thereby ensuring the sealing performance at the edge of the corrugated rubber sheet 23.

[0047] See also Figure 4 The airbag ring 29 is connected to the airbag ring interface 28 on the outer wall of the frame 1 through the air tube, and air is inflated into the airbag ring 29 through the airbag ring interface 28. A hydraulic rod 27 is provided in the direction of the airbag ring 29 away from the pull rod 2. The hydraulic rod 27 presses the airbag ring 29 toward the pull rod 2. The tail end of the hydraulic rod 27 is connected to the hydraulic rod interface 26 outside the frame 1 through a connecting pipe, and is connected to the hydraulic pump through the hydraulic rod interface 26 to control the movement of the hydraulic rod 27.

[0048] See also Figure 6 and Figure 7 The upper roller 6 and the lower roller 7 are both provided with three groups, and the multiple groups of upper rollers 6 and lower rollers 7 with complementary projected areas ensure that most of the dust will not continue to fall.

[0049] See also Figure 9 The ratchet 10 is rotatably connected to the ratchet fixed plate 11. The ratchet 10 is connected to a spring at the lower end, and the direction of the spring's elastic force is opposite to the rotation direction of the ratchet 9, ensuring that the upper roller 6 and the lower roller 7 can only rotate when the pull rod 2 moves upward.

[0050] See also Figure 1 and Figure 3 The upper roller 6, the lower roller 7, and the antimony-impregnated carbon sealing ring 32 are all tightly fitted with the pull rod 2 to prevent dust from sliding down the pull rod 2 and causing environmental pollution.

[0051] The working principle of the present invention is as follows: dust slides down along the upper end of the pull rod 2. When the pull rod 2 moves downward, the ratchet 9 fixedly connected to the roller shaft 8 is limited by the ratchet 10 and cannot rotate. The upper roller 6 and the lower roller 7 slide and rub against the pull rod 2. At this time, the dust accumulates between the upper roller 6 and the pull rod 2 and the lower roller 7 and the pull rod 2. When the pull rod 2 moves upward, the friction between the upper roller 6 and the lower roller 7 causes the upper roller 6 and the lower roller 7 to rotate. The upper roller 6 and the lower roller 7 rotate away from the pull rod 2, thereby discharging the previously accumulated dust and achieving the purpose of isolating most of the dust. In order to ensure that the dust continues to slide down the pull rod 2, the limit rod 13 limits the rotation of the ratchet fixed plate 11. When the pull rod 2 vibrates laterally, the ratchet fixed plate 11 can slide laterally. At this time, the limit rod 13 slides in the slide groove 12. The ratchet fixed plate 11 is subjected to the elastic force of the springs 14 on both sides, which can produce displacement to offset the displacement of the vibration of the pull rod 2, ensuring that the upper roller 6 and the lower roller 7 are close to the pull rod 2. After the corrugated rubber sheet 23 is installed in the installation groove 19, the installation cover 20 is covered, and the compression screw 21 is used to squeeze the compression plate 22 to ensure that the corrugated rubber sheet 2 3, the corrugated rubber sheet 23 can be tensioned or contracted as the pull rod 2 rises or falls, and the sealing performance is always maintained. When the pull rod 2 rises to the limit position, the upper magnet 25 and the lower magnet 24 are instantly attracted, so that the corrugated rubber sheet 23 instantly increases the tilt angle. The dust accumulated on the corrugated rubber sheet 23 bounces toward the annular inclined dust landslide 16, slides along the dust landslide 16 to the lowest point of the dust landslide 16, and is discharged from the dust outlet 17, avoiding excessive accumulation of dust in the sealing device and extending the service life of the device. The hydraulic rod 27 presses the airbag ring 29 against the antimony-impregnated carbon sealing ring 32, making it close to the outer wall of the pull rod 2. At the same time, when the pull rod 2 vibrates, the airbag ring 29 can be deformed, so that the antimony-impregnated carbon sealing ring 32 always keeps close to the outer wall of the pull rod 2 to prevent dust leakage. The pressure gauge 31 outside the frame 1 can intuitively understand the air pressure in the airbag ring 29 through the air pressure probe 30. When the air pressure is low, it means that there is a problem with the sealing device. The sealing device can be inspected and repaired before dust leakage occurs to avoid dust leakage affecting normal production.

[0052] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiment without creative contribution as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A supporting tie rod sealing device for a variable-load medium-speed coal mill in a coal-fired power plant, comprising a frame (1) and a tie rod (2), characterized in that: The upper end of the frame (1) is connected to a roller frame (3), the center of the top end of the roller frame (3) is connected to an annularly distributed upper roller (6) through an upper roller bracket (4), and multiple groups of lower rollers (7) are connected through lower roller brackets (5) below the upper roller (6) with complementary projection areas. A roller shaft (8) is provided in each of the upper roller (6) and the lower roller (7), and the roller shaft (8) is rotatably connected to the upper roller bracket (4) and the lower roller bracket (5) on both sides. (4) and the lower roller bracket (5) are fixedly connected with ratchet wheels (9) at both ends of the roller shaft (8), the upper roller bracket (4) and the lower roller bracket (5) are slidably connected with ratchet fixed disks (11), the ratchet fixed disks (11) are provided with ratchets (10) that cooperate with the ratchet wheels (9), and the two sides of the ratchet fixed disks (11) are provided with springs (14), the roller bracket (3) is provided with a corrugated rubber sheet mounting frame (18) facing the pull rod (2), and the corrugated rubber sheet mounting frame (18) is provided inside the roller bracket (3). The top of the sheet mounting frame (18) is sealedly connected to the corresponding position of the pull rod (2) with an annular corrugated rubber sheet (23), and the corrugated rubber sheet (23) is provided with a lower magnet (24) near one end of the pull rod (2). The inner wall of the roller frame (3) is provided with an upper magnet (25) at a corresponding position above the lower magnet (24). When the pull rod (2) moves upward to the limit position, the upper magnet (25) and the lower magnet (24) are just attracted. The inner wall edge of the roller frame (3) is provided with an inclined annular dust slide. The dust slope (16) is provided with a dust outlet (17) at the bottom of the lowest end of the dust landslide (16), an antimony-impregnated carbon fine sealing ring (32) in close contact with the pull rod (2) is provided inside the lower end of the frame (1), and an air bag ring (29) is provided on the frame (1) in a direction away from the antimony-impregnated carbon fine sealing ring (32) and the pull rod (2), and an air pressure probe (30) is provided in the air bag ring (29), and the air pressure probe (30) is connected to a pressure gauge (31) provided outside the frame (1) through a wire.

2. The supporting rod sealing device for a medium-speed coal mill with variable loading in a coal-fired power plant according to claim 1, characterized in that: The bottom ends of the upper roller bracket (4) and the lower roller bracket (5) are both provided with a limiting rod (13), and the bottom end of the ratchet fixing plate (11) is provided with a sliding groove (12) that cooperates with the limiting rod (13).

3. The supporting rod sealing device for a medium-speed coal mill with variable loading in a coal-fired power plant according to claim 1, characterized in that: Both ends of the corrugated rubber sheet (23) are stuck in the installation groove (19), and the installation groove (19) is respectively fixed to the outer wall of the pull rod (2) and the inner wall of the top end of the corrugated rubber sheet mounting frame (18). The top end of the installation groove (19) is connected to a mounting cover plate (20), and a clamping plate (22) is provided in the installation groove (19) in the direction of the connecting foot of the corrugated rubber sheet (23). The installation cover plate (20) and the installation groove (19) are both provided with a clamping screw (21) in contact with the clamping plate (22).

4. The supporting rod sealing device for a medium-speed coal mill with variable loading in a coal-fired power plant according to claim 1, characterized in that: The airbag ring (29) is connected to the airbag ring interface (28) on the outer wall of the frame (1) via an air tube.

5. The supporting rod sealing device for a medium-speed coal mill with variable loading in a coal-fired power plant according to claim 1, characterized in that: The airbag ring (29) is provided with a hydraulic rod (27) in a direction away from the pull rod (2).

6. The supporting rod sealing device for a medium-speed coal mill with variable loading in a coal-fired power plant according to claim 5, characterized in that: The tail end of the hydraulic rod (27) is connected to a hydraulic rod interface (26) arranged outside the frame (1) via a connecting pipe.

7. The supporting rod sealing device for a medium-speed coal mill with variable loading in a coal-fired power plant according to claim 1, characterized in that: The upper roller (6) and the lower roller (7) are both provided in three groups.

8. The supporting rod sealing device for a medium-speed coal mill with variable loading in a coal-fired power plant according to claim 1, characterized in that: An observation window (15) is provided at the top of the roller frame (3).

9. The supporting rod sealing device for a medium-speed coal mill with variable loading in a coal-fired power plant according to claim 1, characterized in that: The ratchet (10) is rotatably connected to the ratchet fixing plate (11), and a spring is connected to the lower end of the ratchet (10), and the direction of the spring's elastic force is opposite to the rotation direction of the ratchet (9).

10. The supporting rod sealing device for a medium-speed coal mill with variable loading in a coal-fired power plant according to claim 1, characterized in that: The upper roller (6), the lower roller (7), and the antimony-impregnated carbon sealing ring (32) are all tightly fitted to the pull rod (2).

Images