A coal mill base sealing structure and manufacturing method and a coal mill

Abstract

The application discloses a coal mill base sealing structure and manufacturing method and a coal mill, wherein the coal mill base sealing structure comprises a cylinder which is fixedly arranged at a sealing position of the coal mill base; a first circular ring which is fixedly arranged at the top of the cylinder and forms a sealing gap with a grinding disc; and a second circular ring which is fixedly arranged at the middle of the cylinder and is located below the first circular ring; a pressure relief area is formed between the first circular ring and the second circular ring, and the pressure relief area is in communication with the inside of a scraper box. The scheme is characterized in that the first circular ring is fixed at the top of the cylinder and forms a sealing gap with the grinding disc, thereby forming a non-contact sealing when the grinding disc rotates, and avoiding friction jamming; the second circular ring is fixed at the middle of the cylinder and is located below the first circular ring, a pressure relief area is formed between the first circular ring and the second circular ring, the pressure relief area is in communication with the inside of the scraper box, the sealing gas and the airflow carrying coal particles are guided to the inside of the scraper box, and the coal particles are prevented from entering the base sealing area from the source, thereby completely solving the coal leakage problem.

Description

Technical Field

[0001] This application generally relates to the field of coal mill equipment technology. More specifically, this application relates to a coal mill base sealing structure; further, this application also relates to a method for manufacturing a coal mill base sealing structure; and further still, this application also relates to a coal mill. Background Technology

[0002] Vertical coal mills are key equipment in coal powder preparation systems and are widely used in industries such as power, metallurgy, and chemicals. When a vertical coal mill is working, the grinding disc is rotated by a reducer. Raw coal falls from the central feed pipe into the center of the grinding disc and moves towards the edge of the disc under centrifugal force. After being ground into powder by the grinding rollers, it is carried by hot air into a classifier for separation.

[0003] A sealing structure is installed between the grinding disc and the base to prevent coal dust generated during grinding from leaking into the base and the external environment. In existing technology, the base seal of a vertical coal mill typically adopts a stepped seal, where a stepped structure on the base cooperates with the grinding disc to form a seal. However, this sealing structure has the following drawbacks: Firstly, the gap of the stepped seal is relatively small. During long-term operation, due to grinding disc vibration and coal dust abrasion, the sealing surface is prone to wear, leading to a gradual increase in the sealing gap and potentially causing serious coal dust leakage. Secondly, when the equipment vibrates significantly or undergoes displacement, the stepped seal structure is prone to friction and jamming, which not only exacerbates seal failure but may also affect normal equipment operation. After seal failure, coal dust leakage not only pollutes the site environment and increases cleaning and maintenance workload but also leads to increased equipment maintenance frequency, affecting production continuity and increasing operating costs.

[0004] In view of this, there is an urgent need to provide a coal mill base sealing structure and manufacturing method, as well as a coal mill solution, in order to improve sealing performance. Summary of the Invention

[0005] In order to solve at least one or more of the technical problems mentioned above, this application proposes a coal mill base sealing structure and manufacturing method with high sealing performance, as well as a coal mill solution in several aspects.

[0006] In a first aspect, this application provides a coal mill base sealing structure, comprising: a cylinder fixedly disposed at a sealing point of the coal mill base; a first ring fixedly disposed at the top of the cylinder and forming a sealing gap with the grinding disc; and a second ring fixedly disposed at the middle of the cylinder, located below the first ring; a pressure relief area is formed between the first ring and the second ring, and the pressure relief area communicates with the interior of the scraper box.

[0007] In some embodiments, the outer diameter of the cylinder is 3115mm-3120mm, the thickness is 8mm-12mm, and the height is 180mm-200mm.

[0008] In some embodiments, the outer diameter of the first ring is 3120mm-3200mm and the thickness is 8mm-12mm.

[0009] In some embodiments, the sealing gap between the first ring and the grinding disc is 2mm to 4mm.

[0010] In some embodiments, the outer diameter of the second ring is 3180mm-3220mm and the thickness is 8mm-12mm.

[0011] In some embodiments, the axial distance between the first ring and the second ring is 70mm-90mm.

[0012] In some embodiments, the first ring and the second ring are respectively welded and fixed to the cylinder.

[0013] In some embodiments, the cylinder, the first ring, and the second ring together constitute a multi-stage throttling sealing structure; wherein, the sealing gap between the first ring and the grinding disc forms a first-stage throttling, the pressure relief area between the first ring and the second ring forms an expansion cavity for a comb-tooth seal, and the communication between the second ring and the interior of the scraper box forms a pressure relief area guiding structure; the multi-stage throttling sealing structure is a non-contact seal.

[0014] In a second aspect, this application provides a method for manufacturing a coal mill base sealing structure, comprising the following steps: cutting and cleaning the existing vertical sealing plate; welding a cylinder with an outer diameter of 3117 mm, a thickness of 10 mm, and a height of 190 mm; welding a first ring with an outer diameter of 3186 mm and a thickness of 10 mm to the top of the cylinder, and maintaining a gap of 2-4 mm between the first ring and the grinding disc; welding a second ring with an outer diameter of 3200 mm and a thickness of 10 mm to the middle of the cylinder, and maintaining a distance of 80 mm between the second ring and the first ring; and reinstalling the original vertical door curtain.

[0015] In a third aspect, this application provides a coal mill, including the coal mill base sealing structure as described above.

[0016] Through the coal mill base sealing structure provided above, this embodiment of the application, by setting a cylinder fixed to the sealing area of ​​the coal mill base, provides a stable foundation support for the sealing structure and replaces the original easily worn vertical step sealing structure, thereby eliminating the wear hazards of the original structure and improving the overall stability of the structure. Based on this, by setting a first ring fixed to the top of the cylinder and forming a sealing gap with the grinding disc, a non-contact seal is formed when the grinding disc rotates, avoiding friction and jamming between the grinding disc and the sealing structure, adapting to equipment vibration and displacement, and extending the service life of the sealing structure. Furthermore, by setting a second ring fixed in the middle of the cylinder and located below the first ring, forming a vertically spaced arrangement with the first ring, a multi-stage throttling seal is formed, enhancing the sealing effect. Simultaneously, by setting a pressure relief zone between the first and second rings, and by connecting the pressure relief zone to the inside of the scraper box, the sealing gas and the airflow carrying coal particles can be guided into the scraper box through the pressure relief zone, preventing coal particles from entering the base sealing area from the source, completely solving the coal leakage problem. Overall, this application achieves the beneficial effects of improving the long-term operational stability of the coal mill, improving the on-site environment, and significantly reducing equipment maintenance costs through the synergistic effect of the above-mentioned structures. Attached Figure Description

[0017] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application are illustrated by way of example and not limitation, and the same or corresponding reference numerals denote the same or corresponding parts, wherein:

[0018] Figure 1 A schematic diagram of the coal mill base sealing structure according to an embodiment of this application is shown; Figure 2 An exploded view of the coal mill base sealing structure according to an embodiment of this application is shown.

[0019] In the diagram: 100, sealing structure of the coal mill base; 101. Cylinder; 102. First ring; 103. Second ring. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] It should be understood that the terms "comprising" and "including" used in the specification and claims of this application indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0022] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this specification and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0023] As used in this specification and claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0024] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0025] like Figure 1 and Figure 2 As shown, in some embodiments, this application provides a coal mill base sealing structure 100, including: a cylinder 101, which is fixedly disposed at the sealing part of the coal mill base; a first ring 102, which is fixedly disposed at the top of the cylinder 101 and forms a sealing gap with the grinding disc; and a second ring 103, which is fixedly disposed in the middle of the cylinder 101 and located below the first ring 102; a pressure relief area is formed between the first ring 102 and the second ring 103, and the pressure relief area communicates with the interior of the scraper box.

[0026] In this application, the coal mill base sealing structure 100 is mainly used to install at the sealing point of the coal mill base, including a cylinder 101, a first ring 102, and a second ring 103. In the assembled state, this sealing structure is installed in conjunction with the coal mill base, grinding disc, and scraper box.

[0027] Specifically, the cylinder 101 is fixedly installed at the sealing point of the coal mill base, serving as the basic support component of the entire sealing structure. The first ring 102 is fixedly installed at the top of the cylinder 101, specifically by placing the first ring 102 horizontally on the top end face of the cylinder 101 and welding it in place. A sealing gap is formed between the first ring 102 and the grinding disc, located between the upper surface of the first ring 102 and the lower surface of the grinding disc. This gap serves to create a non-contact seal when the grinding disc rotates, preventing friction or jamming between the grinding disc and the sealing structure. The second ring 103 is fixedly installed in the middle of the cylinder 101, specifically by fitting the second ring 103 onto the outer side of the cylinder 101 and welding it in place. The second ring 103 is located below the first ring 102 and is arranged vertically at intervals from the first ring 102.

[0028] A pressure relief zone is formed between the first ring 102 and the second ring 103. This pressure relief zone is located between the lower part of the first ring 102 and the upper part of the second ring 103. The pressure relief zone is connected to the inside of the scraper box. Specifically, it is connected to the inside of the scraper box through the space below the second ring 103, so that the sealing gas or the airflow carrying coal powder can be guided into the scraper box through the pressure relief zone.

[0029] During the operation of the coal mill, the grinding disc rotates, and the sealing gap between the first ring 102 and the grinding disc forms the first seal, preventing coal particles from entering downwards; the pressure relief zone serves as an intermediate chamber, which slows down and depressurizes the airflow entering the zone, and guides the airflow and any coal particles it may carry into the scraper box, thereby preventing coal particles from entering the machine base sealing area further downwards.

[0030] The solution proposed in this application provides a stable foundation support for the sealing structure by fixing a cylinder 101 to the sealing area of ​​the coal mill base. This replaces the original easily worn vertical step sealing structure, thereby eliminating the wear risks of the original structure and improving the overall stability of the structure. Furthermore, by fixing a first ring 102 to the top of the cylinder 101 and forming a sealing gap with the grinding disc, a non-contact seal is created when the grinding disc rotates. This avoids friction and jamming between the grinding disc and the sealing structure, adapts to equipment vibration and displacement, and extends the service life of the sealing structure. Additionally, by fixing a second ring 103 to the middle of the cylinder 101 and located below the first ring 102, and creating a vertically spaced arrangement with the first ring 102, a multi-stage throttling seal is formed, enhancing the sealing effect. Simultaneously, by establishing a pressure relief zone between the first ring 102 and the second ring 103, and ensuring this zone is connected to the inside of the scraper box, the sealing gas and the airflow carrying coal particles can be guided into the scraper box through the pressure relief zone. This prevents coal particles from entering the sealing area of ​​the mill base at the source, completely solving the coal leakage problem. Overall, this application, through the synergistic effect of the above structures, achieves the beneficial effects of improving the long-term operational stability of the coal mill, improving the on-site environment, and significantly reducing equipment maintenance costs.

[0031] In some embodiments, the outer diameter of the cylinder 101 is 3115mm-3120mm, the thickness is 8mm-12mm, and the height is 180mm-200mm.

[0032] In this application, the outer diameter of the cylinder 101 can be from 3115mm to 3120mm, the thickness can be from 8mm to 12mm, and the height can be from 180mm to 200mm. By setting the dimensions of the cylinder 101 within the above range, this solution ensures a stable fit between the cylinder 101 and the sealing area of ​​the coal mill base, and meets the structural strength requirements. Specifically, in a preferred embodiment, the outer diameter of the cylinder 101 is 3117mm, the thickness is 10mm, and the height is 190mm. These preferred dimensions allow the cylinder 101 to precisely match the installation position after the original facade sealing plate has been cut, while ensuring the structural stability after welding, providing a reliable support foundation for the subsequent welding of the first ring 102 and the second ring 103. During installation, the original facade sealing plate is first cut and cleaned, and then the cylinder 101 is welded to the sealing area of ​​the coal mill base, so that the cylinder 101 is fixedly installed in the sealing area of ​​the base. Subsequently, a first ring 102 is welded to the top of the cylinder 101, and a second ring 103 is welded to the middle of the cylinder 101, thereby forming a new sealing structure to replace the original vertical step sealing form.

[0033] In some embodiments, the outer diameter of the first ring 102 is 3120mm-3200mm and the thickness is 8mm-12mm.

[0034] In this application, the outer diameter of the first ring 102 can be set to 3120mm to 3200mm, and the thickness can be set to 8mm to 12mm, depending on actual installation requirements. By setting the dimensions of the first ring 102 within the above range, a stable fit can be ensured between the first ring 102 and the top of the cylinder 101, and the structural strength requirements can be met. In a preferred embodiment, the outer diameter of the first ring 102 is 3186mm, the inner diameter is 3117mm, and the thickness is 10mm. In the above preferred dimensions, the inner diameter of the first ring 102 is equal to the outer diameter of the cylinder 101, which facilitates the horizontal placement of the first ring 102 on the top end face of the cylinder 101 and its welding fixation. The outer diameter of the first ring 102 is 3186mm, which extends by approximately 34.5mm on one side compared to the outer diameter of the cylinder 101, allowing the upper surface of the first ring 102 to extend to the area below the grinding disc. After welding and fixing, a sealing gap is formed between the upper surface of the first ring 102 and the lower surface of the grinding disc. This sealing gap is used to form a non-contact seal when the grinding disc rotates, preventing friction or jamming between the grinding disc and the sealing structure.

[0035] In some embodiments, the sealing gap between the first ring 102 and the grinding disc is 2mm to 4mm.

[0036] In this application, the sealing gap between the first ring 102 and the grinding disc is set to 2mm to 4mm. Controlling the sealing gap within this range ensures that the grinding disc remains in a non-contact state with the first ring 102 during rotation, preventing friction and jamming caused by equipment vibration or displacement. It also creates an effective throttling effect through the smaller gap, preventing coal particles from entering the sealing area downwards. During installation, the fixed position of the first ring 102 at the top of the cylinder 101 is adjusted to create the aforementioned gap between the upper surface of the first ring 102 and the lower surface of the grinding disc. When the sealing gap is set within the range of 2mm to 4mm, even if the grinding disc vibrates or displaces during operation, it can still maintain a non-contact state with the first ring 102, thereby ensuring a good sealing effect while extending the service life of the sealing structure and reducing the frequency of equipment maintenance.

[0037] In some embodiments, the outer diameter of the second ring 103 is 3180mm-3220mm and the thickness is 8mm-12mm.

[0038] In this application, the outer diameter of the second ring 103 can be set to 3180mm to 3220mm, and the thickness can be set to 8mm to 12mm, depending on the installation requirements. By setting the dimensions of the second ring 103 within the above range, a stable fit can be ensured between the second ring 103 and the middle of the cylinder 101, and the structural strength requirements can be met. In a preferred embodiment, the outer diameter of the second ring 103 is 3200mm, the inner diameter is 3117mm, and the thickness is 10mm. In the above preferred dimensions, the inner diameter of the second ring 103 matches the outer diameter of the cylinder 101, which facilitates the second ring 103 being fitted onto the outside of the cylinder 101 and welded in place. After welding, the second ring 103 is located below the first ring 102, and is arranged vertically at a distance from the first ring 102. A pressure relief zone is formed between the first ring 102 and the second ring 103, which communicates with the inside of the scraper box, thereby allowing the sealing gas and the airflow carrying coal particles to be guided into the scraper box.

[0039] It is worth noting that in one embodiment, the inner diameter of the second ring 103 is the same as the outer diameter of the cylinder 101, and it can be fixed by a heat fitting method. Specifically, the second ring 103 is heated to a certain temperature, causing its inner diameter to increase due to thermal expansion. At this time, the second ring 103 is fitted onto the outside of the cylinder 101. After cooling, the second ring 103 shrinks, forming an interference fit with the cylinder 101 to achieve a tight fit.

[0040] In some embodiments, the axial distance between the first ring 102 and the second ring 103 is 70mm-90mm.

[0041] In this application, the axial distance between the first ring 102 and the second ring 103 is set to 70mm to 90mm. Controlling the axial distance within this range ensures sufficient space between the first ring 102 and the second ring 103 as a pressure relief zone, allowing the sealing gas to sufficiently decelerate and depressurize after passing through the first seal. In a preferred embodiment, the axial distance between the first ring 102 and the second ring 103 is 80mm. This preferred distance ensures the pressure relief zone has an appropriate height in the vertical direction, guaranteeing sufficient volume to accommodate the sealing gas and achieve effective pressure relief, while avoiding excessive distance leading to redundant structural dimensions.

[0042] In one specific implementation, the first ring 102 and the second ring 103 are respectively welded and fixed to the cylinder 101.

[0043] In the scheme of this application, the first ring 102 and the second ring 103 are welded and fixed to the cylinder 101 respectively. Specifically, after the original facade sealing plate is cut and cleaned, the cylinder 101 is first welded to the sealing part of the coal mill base, then the first ring 102 is welded to the top of the cylinder 101, then the second ring 103 is welded to the middle of the cylinder 101, and finally the original vertical curtain is reinstalled.

[0044] In one specific implementation, the cylinder 101, the first ring 102, and the second ring 103 together constitute a multi-stage throttling sealing structure; wherein, the sealing gap between the first ring 102 and the grinding disc forms a first-stage throttling, the pressure relief area between the first ring 102 and the second ring 103 forms a comb-tooth seal expansion cavity, and the communication between the second ring 103 and the inside of the scraper box forms a pressure relief area guide structure; the multi-stage throttling sealing structure is a non-contact seal.

[0045] In this application, the cylinder 101, the first ring 102, and the second ring 103 together constitute a multi-stage throttling sealing structure. Specifically, the sealing gap between the first ring 102 and the grinding disc forms the first stage of throttling. When the sealing gas or the airflow carrying coal particles passes through this sealing gap, a throttling effect occurs due to the small gap size, increasing the airflow velocity and decreasing the pressure, thereby preventing most of the coal particles from entering the sealing area downwards. The pressure relief zone between the first ring 102 and the second ring 103 forms the expansion chamber of the comb seal. After the airflow enters this pressure relief zone from the first stage throttling, a vortex is formed due to the sudden expansion of the space, converting kinetic energy into heat energy. The airflow velocity slows down and the pressure further decreases, causing the coal particles in the airflow to settle or decelerate in this area. The connection between the second ring 103 and the inside of the scraper box forms a pressure relief zone guiding structure, allowing the airflow after deceleration and pressure relief in the pressure relief zone, as well as any residual coal particles it may carry, to be guided into the scraper box through the connecting structure, thereby preventing the coal particles from further entering the machine base sealing area. The aforementioned multi-stage throttling sealing structure remains in a non-contact state with the grinding disc when it rotates, avoiding friction and jamming caused by equipment vibration or displacement, and achieving a long-term stable sealing effect.

[0046] In some embodiments, this application provides a method for manufacturing a coal mill base sealing structure 100, comprising the following steps: cutting and cleaning the original vertical sealing plate; welding a cylinder 101 with an outer diameter of 3117 mm, a thickness of 10 mm, and a height of 190 mm; welding a first ring 102 with an outer diameter of 3186 mm and a thickness of 10 mm to the top of the cylinder 101, and maintaining the gap between the first ring 102 and the grinding disc at 2-4 mm; welding a second ring 103 with an outer diameter of 3200 mm and a thickness of 10 mm to the middle of the cylinder 101, and maintaining the distance between the second ring 103 and the first ring 102 at 80 mm; and reinstalling the original vertical curtain.

[0047] In this application, the method for manufacturing the coal mill base sealing structure 100 includes the following steps: First, the existing vertical sealing plate is cut and cleaned to prepare for the installation of the new sealing structure. Then, a cylinder 101 with an outer diameter of 3117 mm, a thickness of 10 mm, and a height of 190 mm is welded to the sealing area of ​​the coal mill base. Next, a first ring 102 with an outer diameter of 3186 mm and a thickness of 10 mm is welded to the top of the cylinder 101, maintaining a gap of 2 mm to 4 mm between the first ring 102 and the grinding disc. Subsequently, a second ring 103 with an outer diameter of 3200 mm and a thickness of 10 mm is welded to the middle of the cylinder 101, with a distance of 80 mm between the second ring 103 and the first ring 102. Finally, the original vertical curtain is reinstalled, completing the overall installation of the sealing structure. The coal mill base sealing structure 100 manufactured through the above steps can achieve a stable connection between the cylinder 101, the first ring 102, and the second ring 103, providing a reliable sealing guarantee for the long-term stable operation of the coal mill.

[0048] In some embodiments, this application provides a coal mill including the coal mill base sealing structure 100 as described above.

[0049] In this application, the coal mill includes the coal mill base sealing structure 100 as described above. Specifically, the coal mill base sealing structure 100 is installed at the base sealing area of ​​the coal mill and is installed in conjunction with the grinding disc and scraper box. By setting the coal mill base sealing structure 100, the coal mill can form a non-contact seal during operation through the sealing gap between the first ring 102 and the grinding disc, avoiding friction and jamming between the grinding disc and the sealing structure. At the same time, through the pressure relief area formed between the first ring 102 and the second ring 103, and connecting the pressure relief area to the inside of the scraper box, the sealing gas and the airflow carrying coal particles are guided into the scraper box, thereby effectively preventing coal particles from entering the base sealing area. Therefore, the coal mill can operate stably for a long time, reduce the frequency of equipment maintenance due to seal failure, improve the surrounding environment of the equipment, and reduce operating and maintenance costs.

[0050] While numerous embodiments of this application have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will arise for those skilled in the art without departing from the spirit and intent of this application. It should be understood that various alternatives to the embodiments of this application described herein may be employed in the practice of this application. The appended claims are intended to define the scope of protection of this application and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A sealing structure for a coal mill base, characterized in that, include: A cylindrical cylinder, which is fixedly installed at the sealing part of the coal mill base; The first ring is fixedly disposed at the top of the cylinder and forms a sealing gap with the grinding disc; as well as The second ring is fixedly disposed in the middle of the cylinder, located below the first ring; A pressure relief zone is formed between the first ring and the second ring, and the pressure relief zone is connected to the inside of the scraper box.

2. The coal mill base sealing structure according to claim 1, characterized in that, The outer diameter of the cylinder is 3115mm-3120mm, the thickness is 8mm-12mm, and the height is 180mm-200mm.

3. The coal mill base sealing structure according to claim 1 or 2, characterized in that, The outer diameter of the first ring is 3120mm-3200mm, and the thickness is 8mm-12mm.

4. The coal mill base sealing structure according to claim 3, characterized in that, The sealing gap between the first ring and the grinding disc is 2mm to 4mm.

5. The coal mill base sealing structure according to claim 1 or 2, characterized in that, The outer diameter of the second ring is 3180mm-3220mm, and the thickness is 8mm-12mm.

6. The coal mill base sealing structure according to claim 1 or 2, characterized in that, The axial distance between the first ring and the second ring is 70mm-90mm.

7. The coal mill base sealing structure according to claim 1, characterized in that, The first ring and the second ring are respectively welded and fixed to the cylinder.

8. The coal mill base sealing structure according to claim 1, characterized in that, The cylinder, the first ring, and the second ring together constitute a multi-stage throttling sealing structure; Wherein, the sealing gap between the first ring and the grinding disc forms a first-stage throttling, the pressure relief area between the first ring and the second ring forms a comb-tooth sealed expansion cavity, and the communication between the second ring and the inside of the scraper box forms a pressure relief area guide structure. The multi-stage throttling sealing structure is a non-contact sealing structure.

9. A method for manufacturing a coal mill base sealing structure as described in any one of claims 1 to 8, characterized in that, Includes the following steps: The original facade sealing panels were cut and cleaned. Weld a cylinder with an outer diameter of 3117mm, a thickness of 10mm, and a height of 190mm; A first ring with an outer diameter of 3186 mm and a thickness of 10 mm is welded to the top of the cylinder, and the gap between the first ring and the grinding disc is maintained at 2-4 mm. A second ring with an outer diameter of 3200 mm and a thickness of 10 mm is welded to the middle of the cylinder, and the distance between the second ring and the first ring is 80 mm. Reinstall the original door curtain.

10. A coal mill, characterized in that, It includes the coal mill base sealing structure as described in any one of claims 1 to 8.

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