A sealing assembly suitable for a 600MW unit coal mill tank body lining plate

Abstract

The application relates to a sealing assembly suitable for a 600MW unit coal mill tank body lining plate, which comprises a tank body, a lining plate and bolts and nuts for connecting the two, a dust cover is arranged on the nut, the dust cover comprises a buffer sleeve and a transparent cover, a limiting ring is coaxially arranged in the buffer sleeve, the limiting ring is located between the nut and the tank body and is sleeved on the bolt, the first end of the buffer sleeve abuts against the outside of the tank body, the inner wall of the second end of the buffer sleeve is coaxially provided with a flexible ring, the opening end of the transparent cover faces the buffer sleeve and is provided with a clasp ring matched with the flexible ring, and the transparent cover is provided with an elastic element for abutting against the inside of the clasp ring and the flexible ring. The dust cover formed by the buffer sleeve and the transparent cover is arranged on the nut outside the tank body, the connecting position of the nut and the tank body is separated from the outside, thereby avoiding the scattered diffusion of the coal powder after the coal powder leaks out, generating a safety hazard, effectively solving the problem that the powder leaks from the tank body due to the increased gap between the lining plate and the bolt caused by the lining plate wear in the current coal mill, and generating a safety hazard.

Description

Technical Field

[0001] This invention belongs to the field of sealing components, and specifically relates to a sealing assembly suitable for the tank lining of a 600MW coal mill unit. Background Technology

[0002] Coal mills are essential equipment for the operation of thermal power plant units. As the core equipment of the pulverizing system, they grind raw coal into pulverized coal for combustion in the furnace. In ball mills, the tank liner and steel balls inside the tank are the main grinding components. The liner is bolted to the inner wall of the tank. When raw coal is transported into the tank, the tank rotates, and the crests and troughs on the liner cause the steel balls and raw coal to rotate with it. After reaching a certain height, they fall in a parabolic trajectory under the action of gravity and inertia. During this process, the steel balls collide and squeeze with the raw coal, thus grinding the raw coal. At the same time, the steel balls and liners will also experience a certain degree of wear, especially for the bottom-level coal mills. With long-term continuous operation, the degree of wear will gradually increase, leading to increased gaps between the liner and bolts, causing powder leakage from the tank and posing a significant safety hazard. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a sealing assembly suitable for the liner of the coal mill tank of a 600MW unit, so as to solve the problem that the wear of the liner in the current coal mill causes the gap between the liner and the bolt to increase, resulting in powder leakage from the tank and creating safety hazards.

[0004] To solve the above problems, the present invention adopts the following technical solution:

[0005] A sealing assembly for a tank liner of a 600MW coal mill includes a tank and a liner laid inside the tank. Bolts pass through the liner and the tank in sequence on the liner. Nuts connected to the bolts are provided on the outside of the tank. A dust collection cover is provided on the nut. The dust collection cover includes a buffer sleeve and a transparent cover. A limiting ring is coaxially provided inside the buffer sleeve. The limiting ring is located between the nut and the tank and is sleeved on the bolt. The first end of the buffer sleeve abuts against the outside of the tank. A flexible retaining ring is coaxially provided on the inner wall of the second end of the buffer sleeve. The open end of the transparent cover faces the buffer sleeve and is provided with a retaining ring adapted to the retaining ring. An elastic element is provided on the transparent cover to make the retaining ring abut against the inner side of the retaining ring.

[0006] Furthermore, the elastic element is located inside the transparent cover, with one end of the elastic element fixedly connected to the transparent cover and the other end of the elastic element abutting against the outside of the tank.

[0007] Furthermore, the second end of the buffer sleeve is provided with an arc-shaped recess that matches the outer side of the tank.

[0008] Furthermore, an adhesive layer is provided on the side where the retaining ring and the retaining ring abut against each other.

[0009] Furthermore, nuts include self-locking nuts.

[0010] Furthermore, a rubber gasket is provided between the limiting ring and the tank body, and the rubber gasket is fitted onto the bolt.

[0011] Furthermore, a polytetrafluoroethylene (PTFE) gasket is provided between the limiting ring and the rubber gasket, and the PTFE gasket is sleeved on the bolt.

[0012] Furthermore, an asbestos gasket is installed between the liner and the inner wall of the tank.

[0013] The significant beneficial effects achieved by this invention are as follows:

[0014] 1. This invention discloses a sealing assembly for the tank liner of a 600MW coal mill unit, comprising a tank, a liner, and bolts and nuts connecting the two. A dust collection hood is provided on the nut, comprising a buffer sleeve and a transparent cover. A limiting ring is coaxially provided inside the buffer sleeve, located between the nut and the tank and fitted onto the bolt. The first end of the buffer sleeve abuts against the outer side of the tank, and a flexible retaining ring is coaxially provided on the inner wall of the second end of the buffer sleeve. The open end of the transparent cover faces the buffer sleeve and is provided with a retaining ring adapted to the retaining ring. An elastic element is provided on the transparent cover to allow the retaining ring to abut against the inner side of the retaining ring. This application uses the buffer sleeve and transparent cover to form a dust collection hood covering the nut outside the tank, isolating the connection between the nut and the tank from the outside environment. This prevents coal dust from leaking out and spreading, causing safety hazards, and effectively solves the problem of coal dust leakage and safety hazards caused by increased gaps between the liner and bolts due to liner wear in current coal mills.

[0015] 2. The elastic element can generate a force away from the tank body on the transparent cover, thereby causing the inner sides of the retaining ring and retaining ring to abut against each other, thus connecting the transparent cover and the buffer sleeve together, which facilitates the collection of leaked coal powder.

[0016] 3. The arc-shaped recess allows for better fit with the outside of the tank, improving the sealing of the dust cover at the connection between the nut and the tank.

[0017] 4. Asbestos gaskets, rubber gaskets, and PTFE gaskets can further improve the sealing and reduce the degree of coal dust leakage.

[0018] 5. The self-locking nut design prevents the nut from moving on the bolt, increasing the tightness of the bolt and nut.

[0019] 6. The adhesive layer on the side of the retaining ring that connects to the retaining ring can increase the connection between the transparent cover and the buffer sleeve, preventing the transparent cover and the buffer sleeve from separating when the tank rotates.

[0020] 7. The dust collection hood also allows staff to monitor the degree of powder leakage, facilitating timely repair and replacement. Attached Figure Description

[0021] Appendix Figure 1 This is a schematic diagram of the connection between the dust hood and the tank body in a sealing assembly suitable for the tank liner of a 600MW unit coal mill, according to Embodiment 1 of the present invention.

[0022] Appendix Figure 2 This is a cross-sectional view of the dust hood in a sealing assembly suitable for the liner of a 600MW coal mill tank, according to Embodiment 1 of the present invention.

[0023] Appendix Figure 3 This is a cross-sectional view of the dust hood in a sealing assembly for a coal mill tank liner of a 600MW unit, according to Embodiment 2 of the present invention.

[0024] Appendix Figure 4 This is a schematic diagram of the connection between the retaining ring and the retaining ring in a sealing assembly suitable for the liner of a 600MW coal mill tank in Embodiment 3 of the present invention.

[0025] In the attached drawings, 1-lining plate, 2-tank body, 3-bolt, 4-nut, 5-buffer sleeve, 6-limiting ring, 7-transparent cover, 8-clamping ring, 10-clamping ring, 11-elastic element, 12-arc-shaped recess, 13-adhesive layer, 14-rubber pad, 15-PTFE pad, 16-asbestos pad. Detailed Implementation

[0026] 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 embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0027] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0028] Example 1

[0029] like Figure 1 and Figure 2As shown, a sealing assembly for a coal mill tank liner suitable for a 600MW unit includes a tank 2 and a liner 1. The liner 1 is laid on the inner wall of the tank 2. Bolts 3 are threaded through the liner 1 and the tank 2 in sequence. Nuts 4 are threaded to the bolts 3 on the outside of the tank 2. A dust collection cover is provided on the nut 4 on the outside of the tank 2. The dust collection cover is used to cover the nut 4 to collect the coal dust that leaks from the gap between the nut 4 and the tank 2.

[0030] The dust collection hood includes a buffer sleeve 5 and a transparent cover 7. The buffer sleeve 5 is spring-shaped and made of silicone or other flexible materials. A limiting ring 6 is coaxially installed inside the buffer sleeve 5. The outer periphery of the limiting ring 6 is fixedly connected to the inner wall of the buffer sleeve 5 by a connecting rod. The limiting ring 6 is fixedly connected to the upper middle part of the buffer sleeve 5. The limiting ring 6 is located between the nut 4 and the tank body 2 and is sleeved on the bolt 3. Tightening the nut 4 can compress the limiting ring 6 to make it fit tightly against the outside of the tank body 2. When the limiting ring 6 is close to the tank body 2, it will cause the first end of the buffer sleeve 5 to fit tightly against the outside of the tank body 2. A flexible retaining ring 8 is coaxially provided on the inner wall of the second end of the buffer sleeve 5. The flexible retaining ring 8 is integrally formed with the buffer sleeve 5 and is made of the same material. The opening end of the transparent cover 7 faces the buffer sleeve 5, and the outer side of the opening end of the transparent cover 7 is integrally formed with the retaining ring 8. The transparent cover 7 has a matching retaining ring 10 and an elastic element 11 inside for the retaining ring 10 to abut against the inner side of the retaining ring 8. After the nut 4 fixes the buffer sleeve 5, the open end of the transparent cover 7 is pressed into the buffer sleeve 5 from the second end of the buffer sleeve 5. The flexible property of the retaining ring 8 will bend inward when the transparent cover 7 enters, so that the open end of the transparent cover 7 and the retaining ring 10 enter the buffer sleeve 5. After the retaining ring 10 passes the retaining ring 8, the retaining ring 8 will automatically rebound under the action of elasticity to limit the retaining ring 10. The elastic element 11 inside the transparent cover 7 will abut against the outer side of the tank body 2, so that the transparent cover 7 will generate a force away from the tank body 2. Under the action of the elastic element 11, the transparent cover 7 will drive the retaining ring 10 to abut against the inner side of the retaining ring 8, thereby combining the transparent cover 7 and the buffer sleeve 5 together.

[0031] Instructions for use: After bolt 3 passes through liner 1 and tank 2 in sequence, fit the limiting ring 6 inside buffer sleeve 5 onto the part of bolt 3 that protrudes from tank 2. Install nut 4 onto bolt 3 and tighten it. Under the pressure of nut 4, the first end of buffer sleeve 5 will be tightly pressed against the outside of tank 2. After buffer sleeve 5 is fixed, press transparent cover 7 so that its open end enters buffer sleeve 5. After the open end of transparent cover 7, together with retaining ring 10, enters buffer sleeve 5, the flexible retaining ring 8 on the inner wall of the second end of buffer sleeve 5 will automatically spring back to limit retaining ring 10, thus preventing the open end of transparent cover 7 from leaving the buffer sleeve. When the transparent cover 7 enters the buffer sleeve 5, the elastic element 11 on the inner side of the transparent cover 7 will abut against the tank body 2, generating a force away from the tank body 2. Therefore, under the action of the elastic element 11, the transparent cover 7 will cause the retaining ring 10 to abut against the inner side of the retaining ring 8, preventing the transparent cover 7 from leaving the buffer sleeve 5. This makes the buffer sleeve 5 and the transparent cover 7 a single dust collection cover. The dust collection cover is placed on the nut 4 outside the tank body 2. After the liner 1 is worn, the gap between the bolt 3 and the liner 1 will increase. Coal dust will enter the dust collection cover along the gap and will not escape everywhere, causing a safety hazard.

[0032] In summary, this application uses a buffer sleeve 5 and a transparent cover 7 to form a dust collection cover on the nut 4 outside the tank body 2, thus isolating the connection between the nut 4 and the tank body 2 from the outside. When the liner 1 is worn and coal powder leaks out from the gap between the bolt 3 and the liner 1, the coal powder will be blocked by the dust collection cover, thereby preventing the coal powder from scattering everywhere and causing safety hazards. This effectively solves the problem of coal powder leakage and safety hazards caused by the increased gap between the liner 1 and the bolt 3 due to the wear of the liner 1 in the current coal mill.

[0033] At the same time, staff can determine whether disassembly and maintenance are needed based on the amount of coal dust leaking out of the dust hood.

[0034] After the liner 1 wears down, the bolts 3 and nut 4 will have a certain amount of displacement. To prevent the loosening of the bolts 3 and nut 4 from affecting the fixation of the limiting ring 6, a rubber pad 14 is provided between the limiting ring 6 and the outer side of the tank body 2. The rubber pad 14 is annular and is sleeved on the bolt 3. When the nut 4 is tightened, the nut 4 exerts a certain compressive force on the rubber pad 14. After the bolts 3 and nut 4 loosen, the rubber pad 14 rebounds and can exert a certain resistance force on the nut 4. At the same time, the rubber pad 14 compresses and limits the limiting ring 6 located between the rubber pad 14 and the nut 4, preventing the position and angle of the limiting ring 6 and the buffer sleeve 5 from changing due to the loosening of the bolts 3 and nut 4, thus losing the sealing effect. The setting of the rubber pad 14 can also increase the sealing effect and reduce the leakage of coal powder.

[0035] In order to ensure that the rubber pad 14 is subjected to uniform force, a polytetrafluoroethylene (PTFE) pad 15 is provided between the rubber pad 14 and the limiting ring 6. The PTFE pad 15 is annular and is sleeved on the bolt 3. The PTFE pad 15 has a certain hardness. When the nut 4 compresses the rubber pad 14, the setting of the PTFE pad 15 can make the rubber pad 14 subjected to uniform force.

[0036] To further prevent coal dust from leaking out of the tank 2, an asbestos gasket 16 is provided between the liner 1 and the tank 2. The bolt 3 passes through the liner 1, the asbestos gasket 16 and the tank 2 in sequence and is then connected to the nut 4. The asbestos gasket 16 can further increase the sealing effect and reduce the amount of coal dust leakage.

[0037] Example 2

[0038] like Figure 3 As shown, the structure of this embodiment is roughly the same as that of embodiment 1. This embodiment is further optimized based on embodiment 2. The elastic element 11 is fixed inside the transparent cover 7. One end of the elastic element 11 is fixedly connected to the inner side of the transparent cover 7, and the other end of the elastic element 11 abuts against the outer side of the tank body 2. In this embodiment, there are two elastic elements 11. The two elastic elements 11 are symmetrically fixed in a figure-eight shape inside the transparent cover 7. The elastic element 11 is an elastic sheet. When the transparent cover 7 enters the buffer sleeve 5, the other ends of the two elastic elements 11 abut against the tank body 2. Since the two elastic elements 11 are arranged in a figure-eight shape, they will automatically separate in two opposite directions when they abut against the tank body 2 and provide a relatively stable support force for the transparent cover 7. The retaining ring 10 at the opening end of the transparent cover 7 abuts against the inner side of the retaining ring 8, thus completing the fixation of the transparent cover 7.

[0039] In order to make the second end of the buffer sleeve 5 fit tightly against the outside of the tank body 2, the second end of the buffer sleeve 5 is provided with an arc-shaped recess 12 that matches the outside of the tank body 2. The fit is increased by setting the arc-shaped recess 12.

[0040] To prevent nut 4 from moving on bolt 3, nut 4 is a self-locking nut.

[0041] Example 3

[0042] like Figure 4 As shown, the structure of this embodiment is roughly the same as that of embodiment 2. This embodiment is further optimized based on embodiment 2. An adhesive layer 13 is provided on the side where the retaining ring 10 and the retaining ring 8 abut. The adhesive layer 13 is an adhesive layer. By setting the adhesive layer 13, the retaining ring 10 and the retaining ring 8 can be bonded together when they abut, thereby increasing the firmness of the transparent cover 7 and the buffer sleeve 5.

[0043] Currently, the technical solution of this application has undergone pilot testing, which is a small-scale experiment before the product is mass-produced. After the pilot testing was completed, a user survey was conducted on a small scale, and the survey results showed that user satisfaction was high. Now, preparations have begun for the formal production and industrialization of the product (including intellectual property risk warning surveys).

Claims

1. A sealing assembly for a coal mill tank liner in a 600MW unit, comprising a tank (2) and a liner (1) laid inside the tank (2), wherein bolts (3) are provided on the liner (1) and the tank (2) in sequence, and nuts (4) connected to the bolts (3) are provided on the outside of the tank (2), characterized in that: The nut (4) is covered with a dust collection cover, which includes a buffer sleeve (5) and a transparent cover (7). A limiting ring (6) is coaxially provided inside the buffer sleeve (5). The limiting ring (6) is located between the nut (4) and the tank (2) and is sleeved on the bolt (3). The first end of the buffer sleeve (5) abuts against the outside of the tank (2). A flexible retaining ring (8) is coaxially provided on the inner wall of the second end of the buffer sleeve (5). The open end of the transparent cover (7) faces the buffer sleeve (5) and is provided with a retaining ring (10) that matches the retaining ring (8). An elastic element (11) is provided on the transparent cover (7) to make the retaining ring (10) abut against the inner side of the retaining ring (8). The outer periphery of the limiting ring (6) is fixedly connected to the inner wall of the buffer sleeve (5) via a connecting rod.

2. A sealing assembly for a 600MW unit coal mill tank liner according to claim 1, characterized in that: The elastic element (11) is disposed inside the transparent cover (7), one end of the elastic element (11) is fixedly connected to the transparent cover (7), and the other end of the elastic element (11) abuts against the outside of the tank body (2).

3. A sealing assembly for a 600MW unit coal mill tank liner according to claim 1, characterized in that: The second end of the buffer sleeve (5) is provided with an arc-shaped recess (12) that is adapted to the outer side of the tank body (2).

4. A sealing assembly for a 600MW unit coal mill tank liner according to claim 1, characterized in that: An adhesive layer (13) is provided on the side of the retaining ring (10) that abuts against the retaining ring (8).

5. A sealing assembly for a 600MW unit coal mill tank liner according to claim 1, characterized in that: The nut (4) includes a self-locking nut.

6. A sealing assembly for a 600MW unit coal mill tank liner according to claim 1, characterized in that: A rubber pad (14) is provided between the limiting ring (6) and the tank body (2), and the rubber pad (14) is sleeved on the bolt (3).

7. A sealing assembly for a 600MW unit coal mill tank liner according to claim 6, characterized in that: A polytetrafluoroethylene (PTFE) pad (15) is provided between the limiting ring (6) and the rubber pad (14), and the PTFE pad (15) is sleeved on the bolt (3).

8. A sealing assembly for a 600MW unit coal mill tank liner according to claim 1, characterized in that: An asbestos pad (16) is provided between the liner (1) and the inner wall of the tank (2).

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