Abrasion-proof sealing structure for lower machine body shaft of coal mill

Abstract

The invention belongs to the technical field of coal mill sealing, and particularly relates to a coal mill lower body shaft anti-abrasion sealing structure which comprises a rotating shaft, a milling bowl mounting seat is fixedly mounted at the top of the rotating shaft, an upper skirt cover is fixedly mounted at the bottom of the milling bowl mounting seat through bolts, and an outer sealing ring is fixedly mounted at the bottom of the upper skirt cover through bolts. The outer side of the rotating shaft is rotationally sleeved with a first sealing assembly, the outer side of the rotating shaft is rotationally sleeved with a mounting gasket, and the outer side of the bottom of the rotating shaft is rotationally sleeved with a second sealing assembly. By means of the labyrinth type sealing shell, the sealing air bag and the fourth carbon alloy ring, two forms of air sealing and mechanical sealing can be achieved, the sealing effect is improved, in addition, if ash breaks through the first sealing assembly and enters the second sealing assembly, the ash can enter a first containing groove in the labyrinth type sealing shell and is contained by the first containing groove, and therefore the sealing effect is improved. Therefore, the rotating shaft can be prevented from being abraded.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mill seals, in particular to an anti-wear seal structure for a lower body shaft of a coal mill. Background Art

[0002] The medium-speed bowl-type coal mill has a wide range of applications and can be used in various occasions where coal powder preparation is required, such as power station boilers, industrial boilers, cement plants, chemical plants, etc. Its efficient coal powder preparation capacity and stable operating performance make it one of the indispensable equipment in these occasions. The medium-speed bowl-type coal mill can be divided into four parts from bottom to top along the height direction: drive device, grinding parts, drying and separation space, and coal powder separation and distribution device. Among them, the grinding parts are usually grinding rollers and bowl-shaped grinding discs.

[0003] In the current existing technology, fine powder and ash will form hard lumps with cracks and wear against the shaft, resulting in serious wear of the lower body shaft sleeve and the risk of wear-through and breakage. In addition, fine ash particles can easily enter the sealing cavity of the air seal device during operation, causing further accelerated wear of the air seal parts inside and outside the coal mill and aggravated sealing leakage problems.

[0004] To this end, the present invention provides an anti-wear sealing structure for the lower body shaft of a coal mill. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve its technical problems is: the anti-wear sealing structure of the lower body shaft of a coal mill described in the present invention includes a rotating shaft, a grinding bowl mounting seat is fixedly installed on the top of the rotating shaft, an upper skirt cover is fixedly installed on the bottom of the grinding bowl mounting seat by bolts, an outer sealing ring is fixedly installed on the bottom of the upper skirt cover by bolts, a first sealing assembly is installed on the outer rotating sleeve of the rotating shaft, a mounting gasket is installed on the outer rotating sleeve of the rotating shaft, a second sealing assembly is installed on the outer rotating sleeve of the bottom of the rotating shaft, a connecting gasket is fixedly installed on the bottom of the rotating shaft by bolts, and an external shaft seat is fixedly installed on the bottom of the connecting gasket by bolts.

[0007] Preferably, the first sealing assembly includes a slag stop ring, which is rotatably sleeved on the outer side of the middle part of the rotating shaft, and a U-shaped groove is provided inside the slag stop ring. The side of the slag stop ring away from the rotating shaft is in contact with the side of the outer sealing ring close to the rotating shaft, and there are two contact areas. The bottom of the slag stop ring is fixed to the top of the mounting gasket by bolts.

[0008] Preferably, a carbon alloy ring 1 is fixedly installed on the inner side of the slag prevention ring, and the slag prevention ring is in sealing contact with the outer side of the rotating shaft through the carbon alloy ring 1. Carbon alloy ring 2 and carbon alloy ring 3 are fixedly installed on the outer side of the slag prevention ring, and the slag prevention ring is in sealing contact with the side of the outer sealing ring close to the rotating shaft through the carbon alloy ring 2 and carbon alloy ring 3.

[0009] Preferably, the second sealing assembly includes a labyrinth sealing shell, a placement groove one is provided on the inner side of the labyrinth sealing shell, a sealing airbag is fixedly installed on the inner side of the placement groove one, a plurality of placement grooves two are provided on the inner side of the plurality of placement grooves two, a carbon alloy ring four is fixedly installed on the inner side of each of the plurality of placement grooves two, and the sealing airbag and the carbon alloy ring four are both in rotational sealing contact with the outer side of the rotating shaft at a side away from the labyrinth sealing shell.

[0010] Preferably, a fixed support ring is fixedly installed at the bottom of the slag blocking ring, an intermediate reinforcement shell is fixedly installed on the outer side of the fixed support ring, an outer protective shell is fixedly installed on the outer side of the intermediate reinforcement shell, and an inner sealing shell is fixedly installed on the inner side of the intermediate reinforcement shell.

[0011] Preferably, a base is fixedly installed at the bottom of the outer protective shell, a buffer gasket is fixedly installed at the top of the base, one end of the labyrinth sealing shell away from the rotating shaft is fixedly installed on the inner side of the base, and the base is rotatably sleeved and installed on the outer side of the external shaft seat.

[0012] Preferably, a miscellaneous material tray is fixedly installed at the bottom of the inner cavity of the intermediate reinforcement shell, the outer side of the top of the miscellaneous material tray contacts the inner side of the inner sealed shell, a mounting groove is opened at the bottom of the miscellaneous material tray, and the bottom of the inner sealed shell is inserted into the inner side of the mounting groove.

[0013] Preferably, two scraper plates are fixedly installed on the outer side of the blanking trough away from one end of the upper skirt cover by bolts, and the bottoms of the two scraper plates are in contact with the top of the miscellaneous material tray, and a blanking frame is fixedly installed inside the miscellaneous material tray, a blanking trough is provided inside the middle reinforcement shell, and a discharge trough is provided inside the base and the buffer gasket, and the blanking trough is located directly below the blanking frame, and the discharge trough is located directly below the blanking trough.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. The anti-wear sealing structure of the lower body shaft of a coal mill described in the present invention can effectively cooperate with the upper skirt cover and the outer sealing ring through a carefully designed slag-blocking ring device to jointly implement strict sealing and shielding measures on the outer side of the rotating shaft. This combination can not only significantly prevent the high-temperature hot primary air from leaking out from the poorly sealed gaps, thereby avoiding energy loss and safety hazards, but also effectively prevent the fine powder ash particles entrained in the hot primary air from invading the transmission jaw part. Once these powder ash particles enter, they often cause serious scouring wear on the surface of the shaft, affecting its service life and mechanical properties. Therefore, the provision of the slag-blocking ring not only improves the sealing performance of the entire system, but also greatly protects the shaft from powder ash erosion, thereby ensuring the stable operation and long-term reliability of the equipment.

[0016] 2. The anti-wear sealing structure for the lower body shaft of a coal mill described in the present invention can achieve both air sealing and mechanical sealing by means of a labyrinth sealing shell, a sealing airbag and a carbon alloy ring four, thereby improving the sealing effect. In addition, if ash slag breaks through the first sealing component and enters the interior of the second sealing component, it will enter the placement groove one inside the labyrinth sealing shell and be received by the placement groove one, and it will not be possible to reach the transmission shaft, thereby ensuring that the rotating shaft is not worn.

[0017] 3. The wear-resistant sealing structure for the lower body shaft of a coal mill described in the present invention is made of carbon alloy ring four, carbon alloy ring one at the contact between the slag prevention ring and the rotating shaft, and carbon alloy ring two and carbon alloy ring three at the contact between the slag prevention ring and the outer sealing ring. The carbon alloy sealing material can maintain excellent sealing effect for a long time in a harsh working environment, greatly prolongs the maintenance interval of the equipment, and reduces maintenance costs. During the design and use of the carbon alloy sealing material, it will not cause wear to the shaft surface due to long-term friction and extrusion, so that the carbon alloy sealing ring can maintain a stable sealing pressure on the contact surface with the shaft without excessive wear or deformation, thereby ensuring the reliability and durability of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 It is a three-dimensional appearance diagram of the present invention;

[0020] Figure 2 is a cutaway perspective view of the present invention;

[0021] Figure 3 The present invention Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of the miscellaneous material tray in the present invention;

[0023] Figure 5 is a schematic diagram of the three-dimensional structure of the first sealing component in the present invention;

[0024] Figure 6 is a schematic diagram of the three-dimensional structure of the second sealing component in the present invention;

[0025] In the figure: 1. outer protective shell; 2. rotating shaft; 3. grinding bowl mounting seat; 4. buffer gasket; 5. base; 6. middle reinforcement shell; 7. inner sealing shell; 8. miscellaneous material tray; 9. blanking frame; 10. scraper plate; 11. outer sealing ring; 12. upper skirt cover; 13. blanking trough; 14. slag blocking ring; 15. U-shaped groove; 16. mounting gasket; 17. discharge trough; 18. external shaft seat; 19. connecting gasket; 20. fixed support ring; 21. carbon alloy ring one; 22. carbon alloy ring two; 23. carbon alloy ring three; 24. labyrinth sealing shell; 25. placement groove one; 26. placement groove two; 27. mounting groove; 28. sealing airbag; 29. ​​carbon alloy ring four. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0027] like Figures 1 to 6As shown, an anti-wear sealing structure for the lower body shaft of a coal mill described in an embodiment of the present invention includes a rotating shaft 2, a grinding bowl mounting seat 3 is fixedly installed on the top of the rotating shaft 2, an upper skirt cover 12 is fixedly installed on the bottom of the grinding bowl mounting seat 3 by bolts, an outer sealing ring 11 is fixedly installed on the bottom of the upper skirt cover 12 by bolts, and a first sealing component is rotatably sleeved on the outer side of the middle part of the rotating shaft 2. A U-shaped groove 15 is opened inside the slag blocking ring 14, a side of the slag blocking ring 14 away from the rotating shaft 2 is in contact with a side of the outer sealing ring 11 close to the rotating shaft 2, and there are two contact areas, the bottom of the slag blocking ring 14 is fixedly installed on the top of the mounting gasket 16 by bolts, a carbon alloy ring 21 is fixedly installed on the inner side of the slag blocking ring 14, the slag blocking ring 14 is in sealing contact with the outer side of the rotating shaft 2 through the carbon alloy ring 21, and a carbon alloy ring 21 is fixedly installed on the outer side of the slag blocking ring 14 Alloy ring 22 and carbon alloy ring 3 23, the slag blocking ring 14 is in sealing contact with the side of the outer sealing ring 11 close to the rotating shaft 2 through the carbon alloy ring 22 and the carbon alloy ring 3 23, the outer side of the rotating shaft 2 is rotatably sleeved with a mounting gasket 16, the outer side of the bottom of the rotating shaft 2 is rotatably sleeved with a second sealing assembly, the second sealing assembly includes a labyrinth sealing shell 24, the inner side of the labyrinth sealing shell 24 is provided with a placement groove 1 25, the inner side of the placement groove 1 25 is fixedly installed with a sealing airbag 28, the inner side of the labyrinth sealing shell 24 is provided with a plurality of placement grooves 26, the inner sides of the plurality of placement grooves 26 are all fixedly installed with a carbon alloy ring 4 29, the sealing airbag 28 and the carbon alloy ring 4 29 away from the labyrinth sealing shell 24 are both in rotating sealing contact with the outer side of the rotating shaft 2, the bottom of the rotating shaft 2 is fixedly installed with a connecting gasket 19 by bolts, and the bottom of the connecting gasket 19 is fixedly installed with an external shaft seat 18 by bolts;During operation, the servo motor group is connected to the external shaft seat 18. After the servo motor group is started, the output end can drive the external shaft seat 18 to rotate, thereby driving the rotating shaft 2 to rotate through the connecting gasket 19, thereby driving the grinding bowl mounting seat 3 to rotate, driving the grinding bowl installed on the top of the grinding bowl mounting seat 3 to rotate, and cooperating with the grinding roller to grind the coal. Through the carefully designed slag blocking ring 14 device, it can effectively cooperate with the upper skirt cover 12 and the outer sealing ring 11 to jointly implement strict sealing and shielding measures on the outer side of the rotating shaft 2. This combination can not only significantly prevent the high-temperature hot primary air from leaking out from the gap that is not tightly sealed, but also avoid energy The slag blocking ring 14 not only improves the sealing performance of the entire system, but also greatly protects the shaft from erosion by ash, ensuring the stable operation and long-term reliability of the equipment. In addition, the labyrinth sealing shell 24, sealing airbag 28 and carbon alloy ring 29 can realize both gas sealing and mechanical sealing, thereby improving the sealing effect. In addition, if ash breaks through the first When a sealing component enters the interior of the second sealing component, it will enter the placement groove 25 inside the labyrinth sealing shell 24 and be received by the placement groove 25. It is impossible for it to reach the transmission shaft, which can ensure that the rotating shaft 2 is not worn. In addition, the carbon alloy ring four 29, the carbon alloy ring one 21 at the contact between the slag blocking ring 14 and the rotating shaft 2, and the carbon alloy ring two 22 and carbon alloy ring three 23 at the contact between the slag blocking ring 14 and the outer sealing ring 11 are all made of carbon alloy. The carbon alloy sealing material can maintain an excellent sealing effect for a long time in a harsh working environment, greatly prolonging the maintenance interval of the equipment and reducing the maintenance cost. The carbon alloy sealing material can maintain an excellent sealing effect for a long time in a harsh working environment, greatly prolonging the maintenance interval of the equipment and reducing the maintenance cost. During the design and use of the sealing material, it will not cause wear on the shaft surface due to long-term friction and extrusion, so that the carbon alloy sealing ring can maintain a stable sealing pressure on the contact surface with the shaft without excessive wear or deformation, thereby ensuring the reliability and durability of the seal. The carbon alloy sealing material can also maintain good friction performance and sealing effect during the high-temperature and high-speed rotation of the rotating shaft 2, effectively preventing leakage and wear problems. Carbon alloy sealing materials have become an ideal choice to meet the needs of short maintenance cycles and no wear on the shaft with their excellent corrosion resistance, high strength and hardness, and excellent friction resistance. ;

[0028] like Figures 1 to 6As shown, a fixed support ring 20 is fixedly installed at the bottom of the slag blocking ring 14, an intermediate reinforcement shell 6 is fixedly installed on the outer side of the fixed support ring 20, an outer protective shell 1 is fixedly installed on the outer side of the intermediate reinforcement shell 6, an inner sealing shell 7 is fixedly installed on the inner side of the intermediate reinforcement shell 6, a base 5 is fixedly installed at the bottom of the outer protective shell 1, a buffer gasket 4 is fixedly installed on the top of the base 5, and the end of the labyrinth sealing shell 24 away from the rotating shaft 2 is fixedly installed on the inner side of the base 5, and the base 5 is rotatably sleeved and installed on the outer side of the external shaft seat 18; when working, the outer side of the rotating shaft 2 can be protected by the outer protective shell 1 and the intermediate reinforcement shell 6, and the device can be conveniently installed on the top of the other parts of the coal mill by the provided base 5, and the provided buffer gasket 4 can play an installation buffering role, and can also play a buffering role when the coal mill is running, and the base 5 also plays a role in supporting and fixing the labyrinth sealing shell 24.

[0029] like Figures 1 to 6 As shown, a miscellaneous material tray 8 is fixedly installed at the bottom of the inner cavity of the middle reinforcement shell 6, the outer side of the top of the miscellaneous material tray 8 contacts the inner side of the inner sealing shell 7, a mounting groove 27 is provided at the bottom of the miscellaneous material tray 8, and the bottom of the inner sealing shell 7 is plugged into the inner side of the mounting groove 27. Two scraper plates 10 are fixedly installed on the outer side of the blanking trough 13 away from one end of the upper skirt cover 12 by bolts, and the bottoms of the two scraper plates 10 are in contact with the top of the miscellaneous material tray 8. A blanking frame 9 is fixedly installed inside the miscellaneous material tray 8, a blanking trough 13 is provided inside the middle reinforcement shell 6, and the base 5 and the buffer gasket 4 are provided with a discharge groove 17, the blanking groove 13 is located just below the blanking frame 9, and the discharge groove 17 is located just below the blanking groove 13; during operation, the grinding bowl mounting seat 3 can drive the upper skirt cover 12 to rotate when it rotates, thereby driving the outer sealing ring 11 to rotate, thereby driving the scraper plate 10 to rotate on the top of the miscellaneous material tray 8, so that the impurities that cannot be crushed and fall from the top of the miscellaneous material tray 8 are pushed to the top of the blanking frame 9, and then fall into the blanking groove 13 through the blanking frame 9, and then discharged through the discharge groove 17.

[0030] Working principle: When working, the servo motor group is connected to the external shaft seat 18. After the servo motor group is started, the output end can drive the external shaft seat 18 to rotate, thereby driving the rotating shaft 2 to rotate through the connecting gasket 19, thereby driving the grinding bowl mounting seat 3 to rotate, driving the grinding bowl installed on the top of the grinding bowl mounting seat 3 to rotate, and cooperating with the grinding roller to grind the coal material, and when the grinding bowl mounting seat 3 rotates, it can drive the upper skirt cover 12 to rotate, thereby driving the outer sealing ring 11 to rotate, thereby driving the scraper plate 10 to rotate on the top of the miscellaneous material plate 8, thereby pushing the impurities that have not been crushed and fallen from the top of the miscellaneous material plate 8 to the top of the blanking frame 9, and then falling through the blanking frame 9 to the inside of the blanking trough 13, and then discharged through the discharge trough 17, through The well-designed slag-blocking ring 14 device can effectively cooperate with the upper skirt cover 12 and the outer sealing ring 11 to implement strict sealing and shielding measures on the outer side of the rotating shaft 2. This combination can not only significantly prevent the high-temperature hot primary air from leaking out from the gaps that are not tightly sealed, avoiding energy loss and safety hazards, but also effectively block the fine powder ash particles entrained in the hot primary air from invading the transmission jaw part. Once these powder ash particles enter, they often cause serious scouring wear on the surface of the shaft 2, affecting its service life and mechanical properties. Therefore, the setting of the slag-blocking ring 14 not only improves the sealing performance of the entire system, but also greatly protects the shaft from powder ash erosion, ensuring the stable operation and long-term reliability of the equipment, and through the setting of the slag-blocking ring 14 The labyrinth sealing shell 24, the sealing airbag 28 and the carbon alloy ring four 29 can realize both air sealing and mechanical sealing to improve the sealing effect. In addition, if any ash breaks through the first sealing component and enters the second sealing component, it will enter the placement groove 25 inside the labyrinth sealing shell 24 and be received by the placement groove 25, and it is impossible to reach the transmission shaft, which can ensure that the rotating shaft 2 is not worn. In addition, the carbon alloy ring four 29, the carbon alloy ring one 21 at the contact between the slag blocking ring 14 and the rotating shaft 2, and the carbon alloy ring two 22 and carbon alloy ring three 23 at the contact between the slag blocking ring 14 and the outer sealing ring 11 are all made of carbon alloy. The carbon alloy sealing material can maintain excellent sealing effect for a long time in harsh working environment, which greatly prolongs the working time. The maintenance interval of the equipment reduces the maintenance cost. The carbon alloy sealing material fully considers the protection of the rotating shaft 2 during its design and use. It will not cause wear to the shaft surface due to long-term friction and extrusion, so that the carbon alloy sealing ring can maintain a stable sealing pressure on the contact surface with the shaft without excessive wear or deformation, thereby ensuring the reliability and durability of the seal. The carbon alloy sealing material can also maintain good friction performance and sealing effect during the high-temperature and high-speed rotation of the rotating shaft 2, effectively preventing the occurrence of leakage and wear problems. Carbon alloy sealing materials have become an ideal choice for meeting the needs of short maintenance cycles and no wear on the shaft with their excellent corrosion resistance, high strength and hardness, and excellent friction resistance.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A wear-resistant sealing structure for the lower shaft of a coal mill, characterized in that: The invention comprises a rotating shaft (2), a grinding bowl mounting seat (3) is fixedly mounted on the top of the rotating shaft (2), an upper skirt cover (12) is fixedly mounted on the bottom of the grinding bowl mounting seat (3) by means of bolts, an outer sealing ring (11) is fixedly mounted on the bottom of the upper skirt cover (12) by means of bolts, a first sealing assembly is rotatably sleeved on the outer side of the rotating shaft (2), a mounting gasket (16) is rotatably sleeved on the outer side of the rotating shaft (2), a second sealing assembly is rotatably sleeved on the outer side of the bottom of the rotating shaft (2), a connecting gasket (19) is fixedly mounted on the bottom of the rotating shaft (2) by means of bolts, and an external shaft seat (18) is fixedly mounted on the bottom of the connecting gasket (19) by means of bolts.

2. The anti-wear sealing structure for the lower shaft of a coal mill according to claim 1, characterized in that: The first sealing component comprises a slag blocking ring (14), which is rotatably sleeved on the outer side of the middle part of the rotating shaft (2), and a U-shaped groove (15) is provided inside the slag blocking ring (14). The side of the slag blocking ring (14) away from the rotating shaft (2) is in contact with the side of the outer sealing ring (11) close to the rotating shaft (2), and there are two contact areas. The bottom of the slag blocking ring (14) is fixed to the top of the mounting gasket (16) by bolts.

3. The anti-wear sealing structure for the lower shaft of a coal mill according to claim 2, characterized in that: A carbon alloy ring 1 (21) is fixedly mounted on the inner side of the slag blocking ring (14), and the slag blocking ring (14) is in sealing contact with the outer side of the rotating shaft (2) via the carbon alloy ring 1 (21). A carbon alloy ring 2 (22) and a carbon alloy ring 3 (23) are fixedly mounted on the outer side of the slag blocking ring (14), and the slag blocking ring (14) is in sealing contact with a side of the outer sealing ring (11) close to the rotating shaft (2) via the carbon alloy ring 2 (22) and the carbon alloy ring 3 (23).

4. The anti-wear sealing structure for the lower shaft of a coal mill according to claim 3, characterized in that: The second sealing component comprises a labyrinth sealing shell (24), the inner side of which is provided with a placement groove one (25), the inner side of which is provided with a sealing airbag (28) fixedly mounted, the inner side of which is provided with a plurality of placement grooves two (26), the inner side of which is provided with a plurality of carbon alloy rings four (29) fixedly mounted, the sealing airbag (28) and the carbon alloy ring four (29) being in rotational sealing contact with the outer side of the rotating shaft (2) on a side away from the labyrinth sealing shell (24).

5. The anti-wear sealing structure for the lower shaft of a coal mill according to claim 4, characterized in that: A fixed support ring (20) is fixedly mounted on the bottom of the slag blocking ring (14), an intermediate reinforcement shell (6) is fixedly mounted on the outer side of the fixed support ring (20), an outer protective shell (1) is fixedly mounted on the outer side of the intermediate reinforcement shell (6), and an inner sealing shell (7) is fixedly mounted on the inner side of the intermediate reinforcement shell (6).

6. The anti-wear sealing structure for the lower shaft of a coal mill according to claim 5, characterized in that: A base (5) is fixedly mounted on the bottom of the outer protective shell (1), a buffer gasket (4) is fixedly mounted on the top of the base (5), one end of the labyrinth seal shell (24) away from the rotating shaft (2) is fixedly mounted on the inner side of the base (5), and the base (5) is rotatably sleeved and mounted on the outer side of the external shaft seat (18).

7. The anti-wear sealing structure for the lower shaft of a coal mill according to claim 6, characterized in that: A miscellaneous material tray (8) is fixedly mounted at the bottom of the inner cavity of the intermediate reinforcement shell (6), the outer side of the top of the miscellaneous material tray (8) contacts the inner side of the inner sealed shell (7), a mounting groove (27) is formed at the bottom of the miscellaneous material tray (8), and the bottom of the inner sealed shell (7) is plugged into the inner side of the mounting groove (27).

8. The anti-wear sealing structure for the lower shaft of a coal mill according to claim 7, characterized in that: Two scraper plates (10) are fixedly installed on the outer side of the blanking trough (13) away from one end of the upper skirt cover (12) by bolts, and the bottoms of the two scraper plates (10) are in contact with the top of the miscellaneous material tray (8). A blanking frame (9) is fixedly installed inside the miscellaneous material tray (8). A blanking trough (13) is provided inside the intermediate reinforcement shell (6), and a discharge trough (17) is provided inside the base (5) and the buffer gasket (4). The blanking trough (13) is located directly below the blanking frame (9), and the discharge trough (17) is located directly below the blanking trough (13).

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