Sealing device of medium-speed coal mill

Abstract

The utility model discloses an airtight device of a medium-speed coal mill, which relates to the field of sealing devices of coal mills and comprises a rotating shaft, an upper sealing component and a lower sealing component. The upper sealing assembly comprises a sealing disc and a flange, the sealing disc is fixedly installed on the rotating shaft, the rotating shaft is sleeved with the flange, and the flange is located below the sealing disc; the lower sealing assembly comprises a base, the base is fixedly installed below the flange, the base is arranged on the outer side of the rotating shaft in a sleeving mode, a sealing bin is arranged on the base, a graphite sleeve is installed in the sealing bin and arranged on the outer side of the rotating shaft in a sleeving mode, and a first graphite ring is arranged on the outer side of the graphite sleeve in a sleeving mode and located in the sealing bin. The utility model aims to disclose a sealing device for a medium-speed coal mill, which improves the sealing performance and the working reliability of the coal mill.

Description

Technical Field

[0001] The utility model relates to the field of coal mill sealing devices, in particular to a medium-speed coal mill sealing device. Background Art

[0002] Medium-speed coal mills play a vital role in modern industrial applications, particularly in key production processes like blast furnace ironmaking. These mills grind medium-hardness materials, such as bituminous and lean coal, into a fine powder. This process is widely used in a variety of industries, including power generation, metallurgy, building materials manufacturing, and chemical product production. In these industries, the efficiency and stability of coal mills directly impact the continuity and economic benefits of the entire production process.

[0003] Therefore, improving the performance of the coal mill, especially improving the sealing of its internal mechanical components, has become one of the key directions of technological progress. However, traditional sealing technology has many shortcomings. Common problems include poor sealing effects due to the high temperature working environment of the coal mill and particle wear. In addition, after a medium-speed coal mill has been running for a long time, the gap between the internal sealing surface and the sealing surface of the transmission disc tends to gradually increase due to wear. This change will lead to insufficient sealing air pressure in the sealing chamber of the lower frame, further making the sealing function of the lower frame of the medium-speed coal mill ineffective, thereby causing a series of problems such as powder leakage and frequent maintenance.

[0004] The existence of these problems not only affects the normal operation and production efficiency of the equipment, but also may cause environmental pollution and safety hazards. Therefore, it is particularly important to innovate and improve the traditional sealing technology of medium-speed coal mills to address the defects. Summary of the Invention

[0005] The purpose of the utility model is to provide an airtight device for a medium-speed coal mill, so as to solve the problems raised in the above background that traditional sealing devices are prone to powder leakage and require frequent maintenance.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A sealing device for a medium-speed coal mill includes a rotating shaft and is characterized by: an upper sealing assembly and a lower sealing assembly;

[0008] The upper sealing assembly includes a sealing disc and a flange, wherein the sealing disc is fixedly mounted on the rotating shaft, the flange is sleeved on the outside of the rotating shaft, and the flange is located below the sealing disc;

[0009] The lower sealing assembly includes a base, which is fixedly installed below the flange and sleeved on the outside of the rotating shaft. A sealing chamber is provided on the base, and a graphite sleeve is installed in the sealing chamber. The graphite sleeve is sleeved on the outside of the rotating shaft, and a graphite ring is sleeved on the outside of the graphite sleeve and located in the sealing chamber.

[0010] Preferably, the sealing disc is fixedly mounted on the rotating shaft and rotates with the shaft, and a grinding disc is fixedly mounted above the sealing disc.

[0011] Preferably, a placement bin is provided on the flange, an annular groove is provided at the bottom of the placement bin, a sealing ring is installed in the annular groove, and a limiting block is provided in the placement bin.

[0012] Preferably, the sealing disk is installed in the placement bin, and a limiting groove is provided below the sealing disk. The limiting groove and the limiting block are rotatably matched. An elastic ring is installed in the limiting groove to increase the sealing performance, and the elastic ring is located above the limiting block.

[0013] Preferably, a boss is provided under the sealing disk, the boss is located at the bottom of the placement chamber and above the sealing ring, and a second graphite ring is mounted on the outside of the boss and located in the placement chamber. The second graphite ring has self-lubricating properties to ensure the wear resistance of the device.

[0014] Preferably, the base is fixedly mounted on the coal mill housing.

[0015] Preferably, the graphite ring 1 is fixedly installed in the sealing chamber, a positioning groove is provided on the graphite ring 1, a graphite sleeve is fixedly installed in the graphite ring 1, and the graphite sleeve has self-lubricating properties to reduce shaft wear.

[0016] Preferably, a positioning ring is fixedly installed on the outside of the graphite sleeve, and a positioning block is provided on the positioning ring. The positioning block is installed in the positioning groove to limit the rotation of the graphite sleeve.

[0017] Preferably, the positioning ring is located below the flange, and a rubber ring is installed between the positioning ring and the flange to ensure sealing inside the device.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The design concept of this utility model is to significantly reduce the leakage problem of the sealing system through the upper and lower double sealing mechanism. The design includes two parts, the upper sealing component and the lower sealing component, to ensure the overall sealing effect and safety performance of the equipment.

[0020] The upper seal assembly is specially equipped with a graphite ring, which effectively prevents larger particles from entering the sealing system. Graphite's inherent self-lubricating properties reduce wear on the sealing surface, thereby protecting it from damage. Furthermore, the assembly incorporates two sealing rings. This dual sealing structure significantly reduces internal leakage of gas or fine particles during cold sealing. This design strengthens the sealing performance of the entire sealing system, ensures strict containment of internal media, and avoids potential environmental contamination or impact on subsequent processes.

[0021] The lower sealing assembly adopts a graphite sleeve, which not only strengthens the sealing of the device, but also protects the rotating shaft and increases its service life. In addition, a positioning ring is installed to prevent the graphite ring from rotating with the shaft during the use of the device, thereby accelerating the internal wear of the sealing device and reducing the sealing performance. The utility model can effectively prevent the leakage of particulate matter such as coal ash carried by hot air. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a vertical view of a sealing device for a medium-speed coal mill in this utility model.

[0023] Figure 2 This is a disassembled diagram of a medium-speed coal mill sealing device in this utility model

[0024] Figure 3 This is a schematic diagram of the internal components of a medium-speed coal mill sealing device of the utility model.

[0025] Figure 4 This is a schematic diagram of the external components of a medium-speed coal mill sealing device of the utility model.

[0026] In the picture:

[0027] 1. Upper sealing assembly; 101, sealing disc; 103, sealing ring; 104, second graphite ring; 105, elastic ring; 106, flange; 109, storage compartment; 110, annular groove; 111, limiting groove; 112, limiting block; 113, boss 2. Lower sealing assembly; 201, base; 203, positioning ring; 204, graphite sleeve; 205, first graphite ring; 206, rubber ring; 208, rotating shaft; 209, sealing compartment; 210, positioning block; 211, positioning groove; DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1 —4. The utility model provides a technical solution:

[0030] A sealing device for a medium-speed coal mill includes a rotating shaft and is characterized by: an upper sealing assembly and a lower sealing assembly;

[0031] The upper sealing assembly includes a sealing disc and a flange, wherein the sealing disc is fixedly mounted on the rotating shaft, the flange is sleeved on the outside of the rotating shaft, and the flange is located below the sealing disc;

[0032] The lower sealing assembly includes a base, which is fixedly installed below the flange and sleeved on the outside of the rotating shaft. A sealing chamber is provided on the base, and a graphite sleeve is installed in the sealing chamber. The graphite sleeve is sleeved on the outside of the rotating shaft, and a graphite ring is sleeved on the outside of the graphite sleeve and located in the sealing chamber.

[0033] The sealing disc is fixedly mounted on the rotating shaft and rotates along with the shaft. A grinding disc is fixedly mounted above the sealing disc.

[0034] A placement bin is provided on the flange, an annular groove is provided at the bottom of the placement bin, a sealing ring is installed in the annular groove, and a limiting block is provided in the placement bin.

[0035] The sealing disc is installed in the placement bin, and a limiting groove is provided below the sealing disc. The limiting groove and the limiting block are rotatably matched. An elastic ring is installed in the limiting groove to increase the sealing performance, and the elastic ring is located above the limiting block.

[0036] A boss is provided below the sealing disk, which is located at the bottom of the placement chamber and above the sealing ring. A second graphite ring is sleeved on the outside of the boss and located in the placement chamber. The second graphite ring has self-lubrication properties to ensure the wear resistance of the device.

[0037] The base is fixedly installed on the coal mill casing.

[0038] The graphite ring is fixedly installed in the sealing chamber. A positioning groove is provided on the graphite ring. A graphite sleeve is fixedly installed in the graphite ring. The graphite sleeve has self-lubricating properties and is used to reduce shaft wear.

[0039] A positioning ring is fixedly installed on the outside of the graphite sleeve. A positioning block is provided on the positioning ring. The positioning block is installed in the positioning groove to limit the rotation of the graphite sleeve.

[0040] The positioning ring is located below the flange, and a rubber ring is installed between the positioning ring and the flange to ensure the sealing inside the device.

Claims

1. A sealing device for a medium-speed coal mill, comprising a rotating shaft (208), characterized in that: An upper sealing assembly (1) and a lower sealing assembly (2); The upper sealing assembly (1) comprises a sealing disc (101) and a flange (106), wherein the sealing disc (101) is fixedly mounted on the rotating shaft (208), the flange (106) is sleeved on the outside of the rotating shaft (208), and the flange (106) is located below the sealing disc (101); The lower sealing assembly (2) includes a base (201), the base (201) is fixedly mounted below the flange (106), the base (201) is sleeved on the outside of the rotating shaft (208), a sealing chamber (209) is provided on the base (201), a graphite sleeve (204) is installed in the sealing chamber (209), the graphite sleeve (204) is sleeved on the outside of the rotating shaft (208), and a graphite ring (205) is sleeved on the outside of the graphite sleeve (204) and is located in the sealing chamber (209).

2. A sealing device for a medium-speed coal mill according to claim 1, characterized in that: The sealing disc (101) is fixedly mounted on the rotating shaft (208) and rotates with the shaft. A grinding disc is fixedly mounted above the sealing disc (101).

3. The sealing device for a medium-speed coal mill according to claim 1, characterized in that: A placement chamber (109) is provided on the flange (106), an annular groove (110) is provided at the bottom of the placement chamber (109), a sealing ring (103) is installed in the annular groove (110), and a limiting block (112) is provided in the placement chamber (109).

4. The sealing device for a medium-speed coal mill according to claim 1, characterized in that: The sealing disc (101) is installed in the placement bin (109), and a limiting groove (111) is provided below the sealing disc (101). The limiting groove (111) and the limiting block (112) are rotatably engaged with each other. An elastic ring (105) is installed in the limiting groove (111) to increase the sealing performance, and the elastic ring (105) is located above the limiting block (112).

5. The sealing device for a medium-speed coal mill according to claim 3, characterized in that: A boss (113) is provided below the sealing disk (101), and the boss (113) is located at the bottom of the placement chamber (109) and above the sealing ring (103). A second graphite ring (104) is sleeved on the outside of the boss (113) and is located in the placement chamber (109). The second graphite ring (104) has self-lubricating properties to ensure the wear resistance of the device.

6. The sealing device for a medium-speed coal mill according to claim 1, characterized in that: The base (201) is fixedly mounted on the coal mill housing.

7. The sealing device for a medium-speed coal mill according to claim 1, characterized in that: The graphite ring (205) is fixedly installed in the sealing chamber (209). A positioning groove (211) is provided on the graphite ring (205). A graphite sleeve (204) is fixedly installed in the graphite ring (205). The graphite sleeve (204) has self-lubricating properties and is used to reduce shaft wear.

8. The sealing device for a medium-speed coal mill according to claim 1, characterized in that: A positioning ring (203) is fixedly mounted on the outside of the graphite sleeve (204), a positioning block (210) is provided on the positioning ring (203), and the positioning block (210) is mounted in the positioning groove (211) to limit the rotation of the graphite sleeve (204).

9. The sealing device for a medium-speed coal mill according to claim 8, characterized in that: The positioning ring (203) is located below the flange (106), and a rubber ring (206) is installed between the positioning ring (203) and the flange (106) to ensure sealing inside the device.

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