Gap-adjustable coal mill base sealing device

Abstract

The utility model provides a gap-adjustable coal mill base sealing device, which relates to the technical field of sealing devices and comprises a coal mill millstone, a millstone rotating shaft is fixedly mounted at the bottom of the coal mill millstone, a sealer is movably sleeved on the outer surface wall of the millstone rotating shaft, and a coal mill base is movably sleeved on the outer surface wall of the sealer. When the sealer is used, a user can inject high-pressure air into the sealer through the one-way valve, the sealing effect of the sealer is improved by means of high pressure, it is guaranteed that pulverized coal cannot enter the sealer, and when the sealing effect is reduced due to abrasion of a sealing ring, the internal high-pressure air leaks, and the sealing effect is not affected. The spring resets and pushes the rubber head to make contact with the millstone rotating shaft to generate noise, a user is reminded to replace the sealing device in time, pulverized coal leakage or equipment damage caused by untimely replacement is avoided, stable operation of the coal mill is guaranteed, and production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of coal mill technology, and in particular to a coal mill base sealing device with adjustable gap. Background Technology

[0002] A coal mill is a machine that crushes and grinds coal into pulverized coal. It is an important auxiliary equipment for pulverized coal boilers and is widely used in industrial fields such as coal-fired power plants, cement plants, and chemical plants. In coal-fired power plants, coal mills are an important auxiliary equipment for pulverized coal boilers, used to grind coal into pulverized coal for combustion. In cement plants and chemical plants, coal mills are also used to crush and grind other materials.

[0003] The wear and tear of the sealing device on the coal mill base is often difficult for users to detect in a timely manner during continuous operation. Currently, the assessment of whether the sealing device needs to be replaced usually relies on periodic inspections. However, this method not only increases the workload of maintenance personnel, but also has a lag effect. Once the sealing device is worn excessively, it will not only lead to the leakage of coal powder, but may also cause equipment failure due to seal failure, resulting in unplanned shutdown of the coal mill, and may even damage other parts of the equipment, thereby increasing maintenance costs and the risk of production interruption. Utility Model Content

[0004] The purpose of this utility model is to solve the problem of coal powder leakage and malfunction caused by the inability to detect wear of the sealing device in time during the use of the above-mentioned equipment, and thus proposes an adjustable gap coal mill base sealing device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a gap-adjustable coal mill base sealing device, comprising a coal mill grinding disc, a grinding disc shaft fixedly installed at the bottom of the grinding disc, a seal movably fitted on the outer wall of the grinding disc shaft, a coal mill base movably fitted on the outer wall of the seal, multiple outer shells fixedly installed on the inner wall of the seal, an installation groove opened on one side of the outer wall of each of the multiple outer shells, a set of springs fixedly installed on one side of the inner wall of each of the multiple installation grooves, a movable plate fixedly installed between the outer walls of the multiple sets of springs, and the inner walls of the multiple installation grooves movably inserted into the outer walls of the movable plates.

[0006] Preferably, a set of connecting columns is fixedly installed on one side of the outer wall of each of the multiple movable plates, and a rubber head is provided on one side of the outer wall of each of the multiple sets of connecting columns.

[0007] Preferably, the inner surface of the sealer is provided with two sealing rings, and the inner surface of the two sealing rings is movably inserted between the inner surface of the two sealing rings and the outer surface of the grinding disc shaft. The top of the sealer is fixedly connected to a one-way valve.

[0008] Preferably, the outer wall of the sealer is fitted with two mounting rings, and each of the two mounting rings has a set of threaded holes at its top.

[0009] Preferably, the inner surface of both sets of threaded holes is threaded with fixing bolts, and the outer surface of one set of fixing bolts is threaded to the inner surface of the coal mill base.

[0010] Preferably, two extrusion plates are threaded between the outer walls of both sets of fixing bolts, and one side of the outer wall of two of the four extrusion plates is in contact with one side of the outer wall of the mounting ring.

[0011] Preferably, each of the four extrusion plates has a sealing ring II on its inner surface wall, and the inner surface walls of the four sealing ring II are movably inserted into the outer surface wall of the grinding disc shaft.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0013] 1. In this utility model, when the sealer is in use, the user can inject high-pressure air into the sealer through a one-way valve. The high pressure improves the sealing effect of the sealer, ensuring that coal dust does not enter the sealer. When the sealing ring wears down and the sealing effect decreases, the internal high-pressure air leaks, the spring resets and pushes the rubber head to contact the grinding disc shaft, generating noise. This promptly reminds the user to replace the sealing device, avoiding coal dust leakage or equipment damage due to untimely replacement, ensuring the stable operation of the coal mill and improving production efficiency.

[0014] 2. In this utility model, the user can adjust the gap between the sealing rings by adjusting the number of sealing rings and extrusion plates, so as to adapt to the wear or rotation difficulties that may occur after long-term use, thereby extending the service life of the device. Attached Figure Description

[0015] Figure 1 This utility model provides a perspective view of the main structure of an adjustable gap coal mill base sealing device;

[0016] Figure 2 This utility model provides a split diagram of an adjustable gap coal mill base sealing device;

[0017] Figure 3 This utility model provides a partial structural cross-sectional view of a gap-adjustable coal mill base sealing device;

[0018] Figure 4 This utility model presents a partial structural disassembly perspective view of a gap-adjustable coal mill base sealing device.

[0019] Legend:

[0020] 1. Coal mill grinding disc; 2. Grinding disc shaft; 3. Seal; 4. Coal mill base; 5. Outer shell; 6. Mounting groove; 7. Spring; 8. Movable plate; 9. Connecting column; 10. Rubber head; 11. Sealing ring one; 12. Check valve; 13. Mounting ring; 14. Threaded hole; 15. Fixing bolt; 16. Extrusion plate; 17. Sealing ring two. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0023] Example 1, as Figures 1-4 As shown, this utility model provides a gap-adjustable coal mill base sealing device, including a coal mill grinding disc 1, a grinding disc shaft 2 fixedly installed at the bottom of the grinding disc 1, a sealer 3 movably sleeved on the outer wall of the grinding disc shaft 2, a coal mill base 4 movably sleeved on the outer wall of the sealer 3, multiple outer shells 5 fixedly installed on the inner wall of the sealer 3, an installation groove 6 opened on one side of the outer wall of each of the multiple outer shells 5, a set of springs 7 fixedly installed on one side of the inner wall of each of the multiple installation grooves 6, a movable plate 8 fixedly installed between the outer walls of the multiple sets of springs 7, and the inner walls of the multiple installation grooves 6 are movably inserted into the outer walls of the movable plates 8, a set of connecting columns 9 fixedly installed on one side of the outer walls of each of the multiple sets of connecting columns 9, a rubber head 10 provided on one side of the outer walls of the sealer 3, two sealing rings 11 provided on the inner wall of the sealer 3, and the inner walls of the two sealing rings 11 movably inserted into the outer wall of the grinding disc shaft 2, and a one-way valve 12 fixedly connected to the top of the sealer 3.

[0024] The overall effect of Embodiment 1 is that when the sealing device is fitted onto the surface of the grinding disc shaft 2, the two sealing rings 11 can fit tightly against the surface of the grinding disc shaft 2, thereby ensuring the sealing performance of the device and preventing coal powder leakage. The user can inject high-pressure air into the sealer 3 through the one-way valve 12, so that the air pressure inside the sealer 3 is higher than the air pressure inside the coal mill. The high pressure further prevents coal powder from entering the sealer 3, improving the sealing performance of the device. At this time, the high-pressure gas will squeeze the movable plate 8 into the outer shell 5, thereby squeezing the spring 7 and driving the connecting column 9 and the rubber head 10 to move. When the sealing rings 11 wear due to friction of the grinding disc shaft 2, the high-pressure air inside the sealer 3 begins to be discharged from the inside. After the air is no longer squeezed, the compressed spring 7 begins to reset, driving the movable plate 8 to move. At this time, the connecting column 9 pushes the rubber head 10 to contact the rotating grinding disc shaft 2 and generates a large noise, which promptly reminds people to replace the sealing device. The device can promptly issue an alarm after losing its sealing effect, avoiding coal powder leakage or device damage due to untimely replacement, reducing maintenance costs and the risk of production interruption.

[0025] Example 2, as Figures 2-4 As shown, the outer wall of the sealer 3 is fixedly fitted with two mounting rings 13. The top of each mounting ring 13 is provided with a set of threaded holes 14. The inner walls of the two sets of threaded holes 14 are threaded with fixing bolts 15. The outer walls of the two sets of fixing bolts 15 are threadedly connected to the inner wall of the coal mill base 4. The outer walls of the two sets of fixing bolts 15 are threaded with two extrusion plates 16. Two of the four extrusion plates 16 have one side of their outer wall in contact with one side of the outer wall of the mounting ring 13. The inner walls of the four extrusion plates 16 are provided with sealing rings 17. The inner walls of the four sealing rings 17 are movably inserted into the outer wall of the grinding disc shaft 2.

[0026] The effect achieved by the entire embodiment 2 is that the multiple sealing rings 17 fitted on the surface of the grinding disc shaft 2 can further enhance the sealing effect of the device, reduce the time and cost of replacement and maintenance. When the device is used for a long time, the gap between the sealing rings becomes large, affecting the sealing effect, or the gap becomes small, making rotation difficult, the user can rotate and unscrew the fixing bolt 15. Then, by changing the number of sealing rings 17 and the extrusion plate 16, the gap is made to be within a reasonable range. After adjustment, the fixing bolt 15 only needs to be tightened again to fix the position of the sealing rings 17 and the sealer 3.

[0027] Working principle: When the sealing device is installed on the surface of the grinding disc shaft 2, the two sealing rings 11 on it can tightly fit against the surface of the grinding disc shaft 2, ensuring the sealing performance of the device and effectively preventing the leakage of coal powder. The user can fill the seal 3 with high-pressure air through the one-way valve 12, so that the air pressure inside the seal 3 is higher than that inside the coal mill, thereby further preventing coal powder from entering the seal 3. At this time, the high-pressure gas will exert pressure on the movable plate 8, causing it to move into the outer shell 5 and compress the spring 7, while driving the connecting column 9 and the rubber head 10 to move together. If the sealing rings 11 are worn due to friction of the grinding disc shaft 2, the high-pressure air inside the seal 3 will begin to leak. After losing air pressure, the compressed spring... 7 will return to its original state, pushing the movable plate 8 to move. During this process, the connecting column 9 will push the rubber head 10 to contact the rotating grinding disc shaft 2, generating a large noise, which will promptly remind the user to replace the sealing device. Multiple sealing rings 17 installed on the surface of the grinding disc shaft 2 can further enhance the sealing effect of the device and reduce the time and cost of replacement and maintenance. If the gap between the sealing rings is too large or too small due to long-term use, affecting the sealing effect or causing difficulty in rotation, the user can unscrew the fixing bolt 15 by rotating it to adjust the number of sealing rings 17 and the extrusion plate 16 to keep the gap within a reasonable range. After adjustment, simply tighten the fixing bolt 15 to fix the position of the sealing rings 17 and the sealer 3.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A gap-adjustable coal mill base sealing device, comprising a coal mill grinding disc (1), characterized in that: The bottom of the grinding disc (1) of the coal mill is fixedly installed with a grinding disc shaft (2). A seal (3) is movably fitted on the outer wall of the grinding disc shaft (2). A coal mill base (4) is movably fitted on the outer wall of the seal (3). Multiple outer shells (5) are fixedly installed on the inner wall of the seal (3). An installation groove (6) is opened on one side of the outer wall of each of the multiple outer shells (5). A set of springs (7) is fixedly installed on one side of the inner wall of each of the multiple installation grooves (6). A movable plate (8) is fixedly installed between the outer walls of the multiple sets of springs (7). The inner walls of the multiple installation grooves (6) are movably inserted into the outer walls of the movable plate (8).

2. The adjustable gap coal mill base sealing device according to claim 1, characterized in that: A set of connecting columns (9) is fixedly installed on one side of the outer wall of each of the multiple movable plates (8), and a rubber head (10) is provided on one side of the outer wall of each of the multiple sets of connecting columns (9).

3. The adjustable gap coal mill base sealing device according to claim 2, characterized in that: The inner surface of the seal (3) is provided with two sealing rings (11), and the inner surface of the two sealing rings (11) is movably inserted between the inner surface of the two sealing rings (11) and the outer surface of the grinding wheel shaft (2). The top of the seal (3) is fixedly connected to a one-way valve (12).

4. The adjustable gap coal mill base sealing device according to claim 3, characterized in that: The outer wall of the sealer (3) is fixedly fitted with two mounting rings (13), and the top of each of the two mounting rings (13) is provided with a set of threaded holes (14).

5. The adjustable gap coal mill base sealing device according to claim 4, characterized in that: The inner walls of both sets of threaded holes (14) are threaded with fixing bolts (15), and the outer walls of the two sets of fixing bolts (15) are threaded with the inner walls of the coal mill base (4).

6. The adjustable gap coal mill base sealing device according to claim 5, characterized in that: Two extrusion plates (16) are threaded between the outer walls of the two sets of fixing bolts (15), and two of the four extrusion plates (16) have one side of their outer wall in contact with one side of the outer wall of the mounting ring (13).

7. The adjustable gap coal mill base sealing device according to claim 6, characterized in that: Each of the four extrusion plates (16) is provided with a sealing ring 2 (17) on its inner surface wall, and the inner surface walls of the four sealing rings 2 (17) are movably inserted into the outer surface wall of the grinding disc shaft (2).

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