Sealing protective cover for lower frame body of coal mill

Abstract

The invention belongs to the technical field of coal grinding devices, and discloses a coal mill lower frame sealing protective cover which comprises a grinding disc, a connecting shaft is fixed to the bottom end of the grinding disc, an upper sealing mechanism is installed in the grinding disc, a cleaning mechanism is arranged at one end of the upper sealing mechanism, and a supporting mechanism is installed in the grinding disc. A lower sealing mechanism is arranged at the bottom end of the supporting mechanism, through cooperation of structures such as a first hook-shaped sealing ring, a second hook-shaped sealing ring and a third hook-shaped sealing ring, the device can enable the second hook-shaped sealing ring to be located between the first hook-shaped sealing ring and the third hook-shaped sealing ring, and the length shape of a sealing groove is kept; when a small amount of pulverized coal enters the sealing channel, the pulverized coal is blocked by the bent part, and when excessive pulverized coal is accumulated, the pulverized coal falls into the collecting groove, so that the sealing part is not influenced, and the aims of conveniently improving the sealing effect of the device and collecting the small amount of pulverized coal entering the sealing groove are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of coal grinding devices, in particular to a sealing protective cover for a lower frame of a coal grinding machine. Background Art

[0002] In actual use, the sealing position of the existing coal mill is not able to enter the protective cover due to the small gap between the grinding disc protective cover and the grinding disc. Since the gap is located at the upper part of the scraper mechanism, the slag can no longer enter the protective cover. However, when the coal mill is blocked, the coal powder content increases, causing great damage to the protective cover and the grinding disc.

[0003] Publication No. CN215567945U discloses a sealing protective cover for the lower frame of a coal mill, including a grinding disc, a sealing mechanism is arranged around the circumference of the grinding disc and between the lower frame, the sealing mechanism includes a labyrinth sealing component and a connecting component, the connecting component includes a flange and a support plate, the flange is connected to the lower frame through the support plate, and the labyrinth sealing component is connected to the flange and the grinding disc respectively. By adopting the labyrinth sealing component, the sealing effect of coal slag is greatly improved, and the sealing effect is better than that of traditional sealing devices, and efficient, energy-saving and environmentally friendly treatment is achieved. At the same time, this design changes the traditional sealing process, greatly improves the coal grinding processing capacity and effect of the coal mill, achieves the goals of energy conservation and emission reduction, high efficiency and environmental protection, and reduced investment, makes up for the technical defects in coal grinding processing in the domestic power industry, has a strong demonstration effect on coal grinding processing in the power industry and other industries, and is of great promotion significance.

[0004] When the device is in use, a labyrinth sealing assembly is used to reduce the passing rate of carbon powder, thereby improving the sealing effect. However, a small amount of carbon powder will still accumulate. After long-term use, a certain amount of carbon powder will still accumulate in the gaps. At this time, when the carbon powder needs to be cleaned, the entire device still needs to be dismantled for inspection. When the user cleans the coal mill seal, the carbon powder accumulated in the seal can be quickly removed and quickly restored, so as to achieve the purpose of quickly cleaning the seal to ensure the sealing effect. Summary of the invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides a sealing protective cover for a lower frame of a coal mill.

[0006] To achieve the above object, the present invention provides the following technical solution: a coal mill lower frame sealing protective cover, comprising a grinding disc, a connecting shaft is fixed to the bottom end of the grinding disc, an upper sealing mechanism is installed inside the grinding disc, a cleaning mechanism is arranged at one end of the upper sealing mechanism, a supporting mechanism is installed inside the grinding disc, and a lower sealing mechanism is arranged at the bottom end of the supporting mechanism; The upper sealing mechanism includes a first hook-shaped sealing ring, a second hook-shaped sealing ring and a third hook-shaped sealing ring. The top end of the first hook-shaped sealing ring is in contact connection with a grinding disc. The outside of the first hook-shaped sealing ring is in contact connection with the second hook-shaped sealing ring. The outside of the second hook-shaped sealing ring is in contact connection with the third hook-shaped sealing ring. The inside of the third hook-shaped sealing ring is in contact connection with a fourth hook-shaped sealing ring; The cleaning mechanism includes a support base, a first cylinder and a sleeve. The support base is fixed outside the fourth hook-shaped sealing ring. A first cylinder is fixed outside the support base. The extending end of the first cylinder is fixed with a sleeve; The support mechanism includes a support flange, a discharge port and a seal. The support flange is in contact connection with the inner wall of the grinding disc. A discharge port is formed on the surface of the support flange. A seal is arranged at the bottom end of the support flange.

[0007] Preferably, a collection groove is formed inside the third hook-shaped sealing ring. A first bolt is threadedly connected to the bottom end of the third hook-shaped sealing ring. A cleaning brush is fixed to the bottom end of the fourth hook-shaped sealing ring. An "arch"-shaped groove is formed between the second hook-shaped sealing ring and the third hook-shaped sealing ring. The output end of the "arch"-shaped groove communicates with the collection groove.

[0008] Preferably, the collection groove is formed in a ring shape. There are several groups of the first bolts, and the first bolts are equally spaced. There are several groups of the cleaning brushes, and the cleaning brushes are equally spaced about the central axis of the connecting shaft.

[0009] Preferably, a second cylinder is fixed to one end inside the sleeve. The extending end of the second cylinder is fixed with a trigger member. A connecting rod is hinged inside the trigger member. One end of the connecting rod is hinged with a limiting block. A connecting seat is fixed to the outside of the connecting shaft. A limiting groove is formed inside the connecting seat. A first electromagnet is fixed to the outside of the support base. A second electromagnet is fixed to the outside of the connecting seat.

[0010] Preferably, there are four groups of the support bases, and the support bases are equally spaced about the central axis of the fourth hook-shaped sealing ring. There are four groups of the connecting rods, and the connecting rods are equally spaced about the central axis of the trigger member. The outer wall of the limiting block fits the inner wall of the sleeve, and the limiting block is slidably connected to the sleeve.

[0011] Preferably, there are four groups of the connecting seats, and the connecting seats are equally spaced about the central axis of the connecting shaft.

[0012] Preferably, a clamping member is fixed to the top end of the seal. A second bolt is threadedly connected to the inside of the support flange. There are several groups of the discharge ports, and the discharge ports are equally spaced. The clamping member is in snap-fit sealing connection with the discharge port. A third hook-shaped sealing ring is arranged at the top end of the support flange.

[0013] Preferably, the lower sealing mechanism includes a rigid windshield ring, a carbon crystal sealing ring, and a sealing groove. The rigid windshields ring is in contact connection with the inner wall of the grinding disc. A carbon crystal sealing ring is in contact connection inside the rigid windshields ring. One end of the rigid windshields ring is provided with a sealing groove. A compression member is fixed inside the sealing groove. An air inlet is installed outside the rigid windshields ring.

[0014] Preferably, the rigid windshields ring is in threaded connection with the second bolt. The outer wall of the carbon crystal sealing ring fits against the inner wall of the grinding disc. A sealing groove is provided between the grinding disc and the rigid windshields ring.

[0015] Preferably, the compression member divides the sealing groove into a sealing end and a pressure - applying end. There are two groups of air inlets, and the air inlets are symmetrically distributed about the central axis of the connecting shaft.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: Through the cooperation of structures such as the first hook - shaped sealing ring, the second hook - shaped sealing ring, and the third hook - shaped sealing ring, the present invention enables the device to place the second hook - shaped sealing ring between the first hook - shaped sealing ring and the third hook - shaped sealing ring, so that the sealing groove maintains its own length and shape. And the bent parts of the second hook - shaped sealing ring and the third hook - shaped sealing ring are made of soft rubber material, which can be slightly deformed during the contact installation and then make contact connection, thereby maintaining the sealing effect. When a small amount of pulverized coal enters the sealing channel, it is first blocked by the bent part. When the pulverized coal accumulates too much, it will fall into the interior of the collection groove, so that the sealing part will not be affected, thereby achieving the purpose of facilitating the device to improve the sealing effect and collecting a small amount of carbon powder entering the sealing groove.

[0017] Through the cooperation of structures such as the support seat, the first cylinder, and the sleeve, the present invention enables the device to start the first electromagnet and the second electromagnet, generate repulsive magnetic force between them, and then start the slow rotation of the connecting shaft. And through the four groups of second electromagnets, drive the first electromagnet to move, and then drive the overall fourth hook - shaped sealing ring to rotate cross -wise following the rotation of the connecting shaft, so that the cleaning brush sweeps the pulverized coal collected inside the collection groove and discharges it through the opening after the first bolt is removed. After the maintenance of the device for discharging the pulverized coal, adjust the first electromagnet and the second electromagnet to an attractive magnetic force, connect the connecting shaft and the fourth hook - shaped sealing ring, so that the cleaning brush and the collection groove are relatively stationary, thereby reducing the wear generated by the cleaning brush, thereby achieving the purpose of facilitating the device to discharge a small amount of collected pulverized coal and ensuring its sealing effect.

[0018] Through the cooperation of structures such as a rigid wind shield ring, a carbon crystal sealing ring, and a sealing groove, after the installation of the rigid wind shield ring is completed, the device can convey gas into the sealing groove for pressurization through a gas conveying port, so that the pressure at the pressure application end is greater than that at the sealing end, and the compression member undergoes slight deformation, thereby reducing the volume of the sealing end, so as to achieve the purpose of facilitating the device to improve the sealing effect at the lower end. Brief Description of the Drawings

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the overall bottom view structure of the present invention; Figure 3 is a schematic diagram of the overall sectional structure of the present invention; Figure 4 In the present invention Figure 3 is a schematic diagram of the enlarged partial sectional structure at A in; Figure 5 is a schematic diagram of the partial front sectional structure of the upper sealing mechanism of the present invention; Figure 6 In the present invention Figure 5 is a schematic diagram of the enlarged partial sectional structure at B in; Figure 7 is a schematic diagram of the structure of the fourth hook-shaped sealing ring of the present invention; Figure 8 is a schematic diagram of the bottom view structure of the fourth hook-shaped sealing ring of the present invention; Figure 9 is a schematic diagram of the structure of the cleaning mechanism of the present invention; Figure 10 is a schematic diagram of the structure of the support mechanism of the present invention; Figure 11 is a schematic diagram of a partial structure of the support mechanism of the present invention.

[0020] In the figure: 1, grinding disc; 2, connecting shaft; 3, upper sealing mechanism; 301, first hook-shaped sealing ring; 302, second hook-shaped sealing ring; 303, third hook-shaped sealing ring; 304, collection groove; 305, first bolt; 306, fourth hook-shaped sealing ring; 307, cleaning brush; 4, cleaning mechanism; 401, support seat; 402, first cylinder; 403, sleeve; 404, second cylinder; 405, trigger member; 406, connecting rod; 407, limiting block; 408, connecting seat; 409, limiting groove; 410, first electromagnet; 411, second electromagnet; 5, support mechanism; 501, support flange; 502, discharge port; 503, sealing member; 504, clamping member; 505, second bolt; 6, lower sealing mechanism; 601, rigid wind shield ring; 602, carbon crystal sealing ring; 603, sealing groove; 604, compression member; 605, gas conveying port. Detailed Description of the Invention

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] As Figures 1 to 11 shown, the present invention provides a sealing protective cover for the lower frame of a coal mill, which includes a grinding table 1. A connecting shaft 2 is fixed to the bottom end of the grinding table 1. An upper sealing mechanism 3 is installed inside the grinding table 1. A cleaning mechanism 4 is arranged at one end of the upper sealing mechanism 3. A support mechanism 5 is installed inside the grinding table 1. A lower sealing mechanism 6 is arranged at the bottom end of the support mechanism 5.

[0023] As Figures 1 to 8 shown, the upper sealing mechanism 3 includes a first hook-shaped sealing ring 301, a second hook-shaped sealing ring 302, and a third hook-shaped sealing ring 303. The top end of the first hook-shaped sealing ring 301 is in contact connection with the grinding table 1. The outside of the first hook-shaped sealing ring 301 is in contact connection with the second hook-shaped sealing ring 302. The outside of the second hook-shaped sealing ring 302 is in contact connection with the third hook-shaped sealing ring 303. The inside of the third hook-shaped sealing ring 303 is in contact connection with a fourth hook-shaped sealing ring 306. A collection groove 304 is opened inside the third hook-shaped sealing ring 303. A first bolt 305 is threadedly connected to the bottom end of the third hook-shaped sealing ring 303. A cleaning brush 307 is fixed to the bottom end of the fourth hook-shaped sealing ring 306. An "arch"-shaped groove is formed between the second hook-shaped sealing ring 302 and the third hook-shaped sealing ring 303. The output end of the "arch"-shaped groove communicates with the collection groove 304. The collection groove 304 is opened in a ring shape. There are several groups of the first bolts 305, and the first bolts 305 are evenly distributed. There are several groups of the cleaning brushes 307, and the cleaning brushes 307 are evenly distributed about the central axis of the connecting shaft 2.

[0024] The above scheme is adopted: by connecting the top of the first hook-shaped sealing ring 301 with the bottom end of the inside of the grinding disc 1, and connecting the top of the second hook-shaped sealing ring 302 with the bottom end of the inside of the grinding disc 1, and fixing the support flange 501 and the third hook-shaped sealing ring 303 with bolts, so that the second hook-shaped sealing ring 302 is located between the first hook-shaped sealing ring 301 and the third hook-shaped sealing ring 303, so that the sealing groove maintains its own length shape, and the bending part of the second hook-shaped sealing ring 302 and the third hook-shaped sealing ring 303 is set to a soft rubber material, which can be slightly deformed during the abutment installation and then abutted and connected, thereby maintaining the sealing effect. When a small amount of coal powder enters the sealing channel, it is first blocked by the bending part. When too much coal powder accumulates, it will fall into the inside of the collecting tank 304, so that the sealing part will not be affected. During maintenance, the first bolt 305 can be removed to discharge and clean the small amount of coal powder entering the sealing part, thereby reducing the steps and time required for device maintenance.

[0025] like Figures 1 to 9 As shown, the cleaning mechanism 4 includes a support seat 401, a first cylinder 402 and a sleeve 403. The support seat 401 is fixed on the outside of the fourth hook-shaped sealing ring 306. The first cylinder 402 is fixed on the outside of the support seat 401. The sleeve 403 is fixed at the extended end of the first cylinder 402. The second cylinder 404 is fixed at one end inside the sleeve 403. The trigger member 405 is fixed at the extended end. A connecting rod 406 is hinged inside the trigger member 405. One end of the connecting rod 406 is hinged to a limiting block 407. The support seat 401 is provided with four groups, and the support seat 401 is evenly spaced about the central axis of the fourth hook-shaped sealing ring 306. The connecting rod 406 is provided with four groups, and the connecting rod 406 is evenly spaced about the central axis of the trigger member 405. The outer wall of the limiting block 407 fits the inner wall of the sleeve 403, and the limiting block 407 and the sleeve 403 are slidably connected.

[0026] like Figures 1 to 9 As shown, a connecting seat 408 is fixed to the outside of the connecting shaft 2, and four groups of connecting seats 408 are arranged. The connecting seats 408 are evenly spaced about the central axis of the connecting shaft 2, and a limiting groove 409 is provided inside the connecting seat 408. A first electromagnet 410 is fixed to the outside of the support seat 401, and a second electromagnet 411 is fixed to the outside of the connecting seat 408.

[0027] Adopt the above solution: When it is necessary to discharge the accumulated pulverized coal, since the fourth hook-shaped sealing ring 306 is located between the third hook-shaped sealing ring 303 and the first hook-shaped sealing ring 301, and the fourth hook-shaped sealing ring 306 is slidably connected to the third hook-shaped sealing ring 303 and the first hook-shaped sealing ring 301, start the first electromagnet 410 and the second electromagnet 411 to generate a repulsive magnetic force between them. Then start the connecting shaft 2 to rotate slowly, and drive the first electromagnet 410 to move through the four groups of second electromagnets 411, thereby driving the overall fourth hook-shaped sealing ring 306 to rotate crosswise following the rotation of the connecting shaft 2, so that the cleaning brush 307 sweeps the pulverized coal collected inside the collection tank 304, and discharges it through the opening after the first bolt 305 is removed. After the device is overhauled for discharging the pulverized coal, adjust the first electromagnet 410 and the second electromagnet 411 to an attractive magnetic force, and start the first cylinder 402 to push the sleeve 403. Since the connecting shaft 2 aligns the sleeve 403 and the connecting seat 408 through the magnetic force of the first electromagnet 410 and the second electromagnet 411 during rotation, the sleeve 403 is inserted into the limiting groove 409 opened in the connecting seat 408, and start the second cylinder 404, so that the second cylinder 404 pushes the trigger 405, the connecting rod 406 and the limiting block 407, so that the limiting block 407 is inserted into the limiting groove 409, and then the fourth hook-shaped sealing ring 306 rotates following the rotation of the connecting shaft 2, and then the cleaning brush 307 and the collection tank 304 are relatively stationary, thereby reducing the wear generated by the cleaning brush 307.

[0028] As Figures 1 to 11 shown, the support mechanism 5 includes a support flange 501, a discharge port 502 and a seal 503. The support flange 501 is in contact connection with the inner wall of the grinding disc 1. The surface of the support flange 501 is provided with a discharge port 502. A seal 503 is arranged at the bottom end of the support flange 501. A clamping member 504 is fixed at the top end of the seal 503. A second bolt 505 is threadedly connected inside the support flange 501. A plurality of groups of discharge ports 502 are opened, and the discharge ports 502 are evenly distributed. The clamping member 504 and the discharge port 502 are snap-fitted and sealed. A third hook-shaped sealing ring 303 is arranged at the top end of the support flange 501.

[0029] Adopt the above solution: By arranging the discharge port 502 at the bottom end of each first bolt 305, during maintenance, remove the seal 503 and the clamping member 504, so that the carbon powder can be discharged through the discharge port 502, and re-fasten the seal 503 and the clamping member 504 after cleaning to complete the seal.

[0030] As Figures 1 to 6As shown, the lower sealing mechanism 6 includes a rigid wind shield ring 601, a carbon crystal sealing ring 602 and a sealing groove 603. The rigid wind shield ring 601 is abutted against the inner wall of the grinding disc 1. The interior of the rigid wind shield ring 601 is abutted against the carbon crystal sealing ring 602. A sealing groove 603 is provided at one end of the rigid wind shield ring 601. The rigid wind shield ring 601 is threadedly connected to the second bolt 505. The outer wall of the carbon crystal sealing ring 602 fits the inner wall of the grinding disc 1. A sealing groove 603 is provided between the grinding disc 1 and the rigid wind shield ring 601. A compression member 604 is fixed inside the sealing groove 603. An air delivery port 605 is installed outside the rigid wind shield ring 601. The compression member 604 separates the sealing groove 603 into a sealing end and a pressure end. Two groups of air delivery ports 605 are provided, and the air delivery ports 605 are symmetrically distributed about the central axis of the connecting shaft 2.

[0031] The above scheme is adopted: by fixing the rigid wind shield ring 601 to the bottom end of the supporting flange 501 by the second bolt 505, utilizing the carbon crystal sealing ring 602 to be in contact with the inner wall of the grinding wheel 1 to improve the sealing effect, and after completing the installation of the rigid wind shield ring 601, pressurizing the inside of the sealing groove 603 through the air supply port 605, so that the pressure at the pressure end is greater than that at the sealing end, and the compression member 604 is slightly deformed, thereby reducing the volume of the sealing end, thereby improving the sealing effect.

[0032] The working principle and use process of the present invention are as follows: the top of the first hook-shaped sealing ring 301 is connected to the bottom end of the inside of the grinding disc 1 by abutting, and the top of the second hook-shaped sealing ring 302 is connected to the bottom end of the inside of the grinding disc 1 by abutting, and the supporting flange 501 and the third hook-shaped sealing ring 303 are fixedly connected by bolts, so that the second hook-shaped sealing ring 302 is located between the first hook-shaped sealing ring 301 and the third hook-shaped sealing ring 303, so that the sealing groove maintains its own length shape, and the bending part of the second hook-shaped sealing ring 302 and the third hook-shaped sealing ring 303 is set to a soft rubber material, which can be slightly deformed during the abutting installation and then abutted and connected, thereby maintaining the sealing effect. When a small amount of coal powder enters the sealing channel, it is first blocked by the bending part. When the coal powder accumulates If there is too much coal powder, it will fall into the inside of the collecting tank 304, so that the sealing part will not be affected, and during maintenance, the first bolt 305 can be removed to discharge and clean the small amount of coal powder that has entered the sealing part, thereby reducing the steps and time required for device maintenance, and when the accumulated coal powder needs to be discharged, since the fourth hook-shaped sealing ring 306 is located between the third hook-shaped sealing ring 303 and the first hook-shaped sealing ring 301, the fourth hook-shaped sealing ring 306 and the first hook-shaped sealing ring 301 and the third hook-shaped sealing ring 303 are slidingly connected, the first electromagnet 410 and the second electromagnet 411 are started to generate a repulsive magnetic force between the two, and then the connecting shaft 2 is started to rotate slowly, and the first electromagnet 410 is driven by the four groups of second electromagnets 411. The movement drives the fourth hook-shaped sealing ring 306 to rotate crosswise with the rotation of the connecting shaft 2, so that the cleaning brush 307 cleans the coal powder collected in the collecting tank 304 and discharges it through the opening after the first bolt 305 is removed. After the coal powder is discharged, the first electromagnet 410 and the second electromagnet 411 are adjusted to attract each other, and the first cylinder 402 is started to push the sleeve 403. Since the connecting shaft 2 is aligned with the connecting seat 408 through the magnetic force of the first electromagnet 410 and the second electromagnet 411 during the rotation process, the sleeve 403 is inserted into the limiting groove 409 provided in the connecting seat 408, and the second cylinder 404 is started, so that the second cylinder 404 pushes the trigger member 405 and the connecting rod 408. 6 and the limit block 407, so that the limit block 407 is inserted into the limit groove 409, so that the fourth hook-shaped sealing ring 306 rotates with the rotation of the connecting shaft 2, so that the cleaning brush 307 and the collecting groove 304 are relatively stationary, thereby reducing the wear of the cleaning brush 307, and by opening the discharge port 502 at the bottom end of each group of first bolts 305, during maintenance, the sealing member 503 and the clamping member 504 are removed, so that the carbon powder can be discharged through the discharge port 502, and after cleaning, the sealing member 503 and the clamping member 504 are buckled back to complete the sealing, and then the rigid wind shield ring 601 is fixed to the bottom end of the supporting flange 501 by the second bolt 505, and the carbon crystal sealing ring 602 is used to contact and connect with the inner wall of the grinding disc 1 to improve the sealing effect,After the installation of the rigid windshield ring 601 is completed, gas is introduced into the sealing groove 603 through the gas inlet 605 to pressurize it, so that the pressure at the pressure-applying end is greater than that at the sealing end, and the compression member 604 undergoes slight deformation, thereby reducing the volume of the sealing end and further improving the sealing effect.

[0033] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0034] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealing protection cover for the lower frame of a coal mill, comprising a grinding table (1), characterized in that: A connecting shaft (2) is fixed to the bottom end of the grinding disc (1). An upper sealing mechanism (3) is installed inside the grinding disc (1). A cleaning mechanism (4) is arranged at one end of the upper sealing mechanism (3). A supporting mechanism (5) is installed inside the grinding disc (1). A lower sealing mechanism (6) is arranged at the bottom end of the supporting mechanism (5); The upper sealing mechanism (3) includes a first hook-shaped sealing ring (301), a second hook-shaped sealing ring (302) and a third hook-shaped sealing ring (303). The top end of the first hook-shaped sealing ring (301) is in contact connection with the grinding disc (1). The outside of the first hook-shaped sealing ring (301) is in contact connection with the second hook-shaped sealing ring (302). The outside of the second hook-shaped sealing ring (302) is in contact connection with the third hook-shaped sealing ring (303). The inside of the third hook-shaped sealing ring (303) is in contact connection with a fourth hook-shaped sealing ring (306); The cleaning mechanism (4) includes a support seat (401), a first cylinder (402) and a sleeve (403). The support seat (401) is fixed to the outside of the fourth hook-shaped sealing ring (306). A first cylinder (402) is fixed to the outside of the support seat (401). A sleeve (403) is fixed to the extending end of the first cylinder (402); The supporting mechanism (5) includes a support flange (501), a discharge port (502) and a seal (503). The support flange (501) is in contact connection with the inner wall of the grinding disc (1). A discharge port (502) is formed on the surface of the support flange (501). A seal (503) is arranged at the bottom end of the support flange (501).

2. The seal protection cover for the lower frame of the coal mill according to claim 1, characterized in that: A collection groove (304) is formed inside the third hook-shaped sealing ring (303). A first bolt (305) is threadedly connected to the bottom end of the third hook-shaped sealing ring (303). A cleaning brush (307) is fixed to the bottom end of the fourth hook-shaped sealing ring (306). An "arch"-shaped groove is formed between the second hook-shaped sealing ring (302) and the third hook-shaped sealing ring (303). The output end of the "arch"-shaped groove communicates with the collection groove (304).

3. The seal protection cover for the lower frame of the coal mill according to claim 2, characterized in that: The collection groove (304) is formed in a ring shape. There are several groups of the first bolts (305), and the first bolts (305) are equally spaced. There are several groups of the cleaning brushes (307), and the cleaning brushes (307) are equally spaced about the central axis of the connecting shaft (2).

4. The seal protection cover for the lower frame of the coal mill according to claim 1, wherein: A second cylinder (404) is fixed to one end inside the sleeve (403). A trigger member (405) is fixed to the extending end of the second cylinder (404). A connecting rod (406) is hinged inside the trigger member (405). One end of the connecting rod (406) is hinged to a limiting block (407). A connecting seat (408) is fixed to the outside of the connecting shaft (2). A limiting groove (409) is formed inside the connecting seat (408). A first electromagnet (410) is fixed to the outside of the support seat (401). A second electromagnet (411) is fixed to the outside of the connecting seat (408).

5. The seal protection cover for the lower frame of the coal mill according to claim 4, wherein: There are four sets of the support seats (401), the support seats (401) are equally spaced about the central axis of the fourth hook-shaped sealing ring (306), there are four sets of the connecting rods (406), the connecting rods (406) are equally spaced about the central axis of the trigger member (405), the outer wall of the limiting block (407) is in contact with the inner wall of the sleeve (403), and the limiting block (407) is slidably connected to the sleeve (403).

6. The sealing protection cover for the lower frame of the coal mill according to claim 4, wherein: There are four sets of the connecting seats (408), the connecting seats (408) are equally spaced about the central axis of the connecting shaft (2).

7. The seal protection cover for the lower frame of the coal mill according to claim 1, wherein: A clamping member (504) is fixed at the top of the sealing member (503), a second bolt (505) is threadedly connected inside the support flange (501), there are several sets of discharge openings (502), the discharge openings (502) are equally spaced, the clamping member (504) and the discharge openings (502) are clamped and sealed, and a third hook-shaped sealing ring (303) is arranged at the top of the support flange (501).

8. The seal protection cover for the lower frame of the coal mill according to claim 1, characterized in that: The lower sealing mechanism (6) includes a rigid wind blocking ring (601), a carbon crystal sealing ring (602) and a sealing groove (603), the rigid wind blocking ring (601) is in contact connection with the inner wall of the grinding disc (1), the carbon crystal sealing ring (602) is in contact connection inside the rigid wind blocking ring (601), a sealing groove (603) is opened at one end of the rigid wind blocking ring (601), a compression member (604) is fixed inside the sealing groove (603), and an air inlet (605) is installed outside the rigid wind blocking ring (601).

9. The seal protection cover for the lower frame of the coal mill according to claim 8, characterized in that: The rigid wind blocking ring (601) is threadedly connected with the second bolt (505), the outer wall of the carbon crystal sealing ring (602) is in contact with the inner wall of the grinding disc (1), and a sealing groove (603) is opened between the grinding disc (1) and the rigid wind blocking ring (601).

10. The sealing protective cover for the lower frame of the coal mill according to claim 8, characterized in that: The compression member (604) divides the sealing groove (603) into a sealing end and a pressure application end, there are two sets of the air inlets (605), and the air inlets (605) are symmetrically distributed about the central axis of the connecting shaft (2).

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