Air ring sealing structure of coal mill

Abstract

The utility model provides a coal mill air ring sealing structure, which relates to the technical field of coal mills and comprises a coal mill driving disc, an upper sealing element is fixedly mounted on the lower surface of the coal mill driving disc, a lower sealing element is arranged on the lower surface of the upper sealing element, a rubber sealing ring is arranged in the upper sealing element, and a sealing ring is arranged in the rubber sealing ring. And a sealing groove is formed in the surface of the rubber sealing ring. Through the cooperation of the tension spring, the ejector rod and the ejector block, the tension spring provides elastic force for the ejector rod, so that the ejector block is tightly attached to the side face of the rubber sealing ring, the rubber sealing ring is firmly fixed to the corresponding position, stable pre-tightening force is applied to the rubber sealing ring, and in the running process of the coal mill, the rubber sealing ring is not prone to falling off. The rubber sealing ring is effectively prevented from shifting or deforming due to rotation of the rotating shaft or other external force, the sealing effect is further enhanced, leakage of media in the coal mill is reduced, stable operation of the coal mill is guaranteed, and the working efficiency of the coal mill is improved.

Description

Technical Field

[0001] This utility model relates to the field of coal mill technology, and in particular to a coal mill air ring sealing structure. Background Technology

[0002] Coal mills are important auxiliary equipment in thermal power plants. Their main function is to provide pulverized coal for boiler combustion. Their operating conditions directly affect the safety, stability, and economy of the unit. The coal mill's air ring is installed on the grinding disc and rotates with the grinding disc. Primary air passes through the side body of the coal mill and is blown upwards along the air ring nozzle. After the primary air mixes with the qualified pulverized coal inside the coal mill, the qualified pulverized coal particles are sent out of the coal mill through the pulverized coal conveying pipeline.

[0003] In existing technologies, such as the Chinese patent CN221647842U entitled "A Coal Mill Air Ring Sealing Structure," a coal mill drive disc is included. An upper seal and a lower seal are installed on the drive disc, and a connecting member is installed between them. A flange sealing mechanism is installed inside the connecting member near one end of the drive disc, and a quick-release air ring mechanism is installed at the other end. The sealing of the coal mill drive disc is achieved through the cooperation of the flange sealing mechanism installed between the upper and lower seals, the quick-release air ring mechanism, and the moving ring. In flange sealing, the carbon precision rubber sealing ring inside can be quickly replaced by disassembling and tightening the flange. Simultaneously, the combination of the irregular mounting groove and the I-shaped slider in the cross-ventilation air ring mechanism is positioned by a set of fastening bolts, making disassembly and replacement easier when replacing the air ring. This ensures sealing performance while increasing disassembly ease, improving maintenance and production efficiency.

[0004] Although this type of coal mill air ring sealing structure facilitates disassembly and replacement during air ring replacement, it does not provide a stable pre-tightening force for the rubber sealing ring. Due to external forces such as friction, vibration, and internal medium pressure fluctuations generated by the rotation of the coal mill shaft, the rubber sealing ring is prone to displacement, leading to gaps on the sealing surface. Moreover, the rubber sealing ring is also prone to deformation due to long-term stress, such as being squeezed or stretched. Once these situations occur, the sealing effect will be greatly reduced, failing to effectively prevent the leakage of coal powder, airflow, and other media inside the coal mill, increasing energy consumption and the risk of pollution to the surrounding environment. Utility Model Content

[0005] The purpose of this invention is to solve the problem in the prior art that the tightness of the fit between the rubber sealing ring and the sealing surface gradually decreases as the coal mill runs for longer, leading to sealing failure. Therefore, this invention proposes a coal mill air ring sealing structure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a coal mill air ring sealing structure, including a coal mill transmission disc, an upper sealing element fixedly installed on the lower surface of the coal mill transmission disc, a lower sealing element provided on the lower surface of the upper sealing element, a rubber sealing ring provided inside the upper sealing element, a sealing groove opened on the surface of the rubber sealing ring, an installation sleeve fixedly installed inside the upper sealing element, a top rod slidably connected inside the installation sleeve, a top block fixedly installed at one end of the top rod, and a tension spring provided inside the installation sleeve.

[0007] Preferably, the upper seal and the lower seal are connected and fixed by a locating pin.

[0008] Preferably, one end of the tension spring is fixedly connected to the inner side of the mounting sleeve, and one end of the tension spring is fixedly connected to one end of the push rod.

[0009] Preferably, the side of the top block is in contact with the side of the rubber sealing ring, and the top block is distributed in a ring shape inside the upper seal.

[0010] Preferably, a connecting rod is fixedly connected to one end of the top rod, a connecting plate is fixedly installed to one end of the connecting rod, an abutment block is fixedly installed on the side of the connecting plate, and a trigger alarm is fixedly installed on the side of the upper seal.

[0011] Preferably, the connecting rod is slidably connected to the mounting sleeve, the connecting rod is slidably connected to the upper seal, and the trigger switch of the trigger alarm is coaxial with the central axis of the contact block.

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

[0013] 1. In this utility model, through the cooperation of tension spring, top rod and top block, the tension spring provides elastic force to the top rod, so that the top block tightly fits the side of the rubber sealing ring, thereby firmly fixing the rubber sealing ring in the corresponding position and applying a stable pre-tightening force to the rubber sealing ring. During the operation of the coal mill, it effectively prevents the rubber sealing ring from shifting or deforming due to the rotation of the rotating shaft or other external forces, further enhancing the sealing effect, reducing the leakage of the internal medium of the coal mill, thereby ensuring the stable operation of the coal mill and improving its working efficiency.

[0014] 2. In this utility model, through the design of the top rod, connecting rod, connecting plate, contact block and trigger alarm, when the rubber sealing ring gradually wears down over time, the top block will gradually move towards the center of the rubber sealing ring under the action of the tension spring. The top rod, connecting rod and connecting plate connected to it will also move synchronously. When the rubber sealing ring wears down to a certain extent, the contact block will trigger the switch of the trigger alarm, and the trigger alarm will emit an alarm signal, thereby timely reminding the operator that the rubber sealing ring needs to be replaced, avoiding the situation where the seal fails due to excessive wear of the rubber sealing ring. Attached Figure Description

[0015] Figure 1 This utility model provides a three-dimensional structural diagram of a coal mill air ring sealing structure;

[0016] Figure 2 A side sectional view of a coal mill air ring sealing structure is provided for this utility model;

[0017] Figure 3 This utility model provides a top sectional view of a coal mill air ring sealing structure;

[0018] Figure 4 This utility model proposes a coal mill air ring sealing structure. Figure 2 Enlarged view of point A in the middle.

[0019] Legend: 1. Coal mill drive disc; 2. Upper seal; 3. Lower seal; 4. Rubber sealing ring; 5. Sealing groove; 6. Mounting sleeve; 7. Top rod; 8. Top block; 9. Tension spring; 10. Positioning pin; 11. Connecting rod; 12. Connecting plate; 13. Abutment block; 14. Trigger alarm. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] Example 1: As Figures 1-4As shown, this utility model provides a technical solution: a coal mill air ring sealing structure, including a coal mill transmission disc 1, an upper sealing element 2 fixedly installed on the lower surface of the coal mill transmission disc 1, a lower sealing element 3 provided on the lower surface of the upper sealing element 2, a rubber sealing ring 4 provided inside the upper sealing element 2, a sealing groove 5 opened on the surface of the rubber sealing ring 4, an installation sleeve 6 fixedly installed inside the upper sealing element 2, a top rod 7 slidably connected inside the installation sleeve 6, a top block 8 fixedly installed at one end of the top rod 7, a tension spring 9 provided inside the installation sleeve 6, the upper sealing element 2 and the lower sealing element 3 are connected and fixed by a positioning pin 10, one end of the tension spring 9 is fixedly connected to the inner side of the installation sleeve 6, one end of the tension spring 9 is fixedly connected to one end of the top rod 7, the side of the top block 8 fits against the side of the rubber sealing ring 4, and the top block 8 is distributed in a ring shape inside the upper sealing element 2.

[0023] In this embodiment, through the cooperation of tension spring 9, push rod 7, and push block 8, tension spring 9 provides elastic force to push rod 7, causing push block 8 to tightly fit against the side of rubber sealing ring 4, thereby firmly fixing rubber sealing ring 4 in the corresponding position and applying a stable preload to rubber sealing ring 4. During the operation of the coal mill, this effectively prevents rubber sealing ring 4 from shifting or deforming due to the rotation of the rotating shaft or other external forces, further enhancing the sealing effect, reducing leakage of the internal medium of the coal mill, and thus ensuring the stable operation of the coal mill and improving its working efficiency.

[0024] Example 2: Figures 1-4 As shown, a connecting rod 11 is fixedly connected to one end of the top rod 7, a connecting plate 12 is fixedly installed to one end of the connecting rod 11, an abutment block 13 is fixedly installed on the side of the connecting plate 12, a trigger alarm 14 is fixedly installed on the side of the upper seal 2, the connecting rod 11 is slidably connected to the mounting sleeve 6, the connecting rod 11 is slidably connected to the upper seal 2, and the trigger switch of the trigger alarm 14 is coaxial with the central axis of the abutment block 13.

[0025] In this embodiment, through the design of the top rod 7, connecting rod 11, connecting plate 12, contact block 13, and trigger alarm 14, when the rubber sealing ring 4 gradually wears down over time, the top block 8 will gradually move towards the center of the rubber sealing ring 4 under the action of the tension spring 9. The top rod 7, connecting rod 11, and connecting plate 12 connected to it will also move synchronously. When the rubber sealing ring 4 wears down to a certain extent, the contact block 13 will trigger the switch of the trigger alarm 14, and the trigger alarm 14 will emit an alarm signal, thereby timely reminding the operator that the rubber sealing ring 4 needs to be replaced, avoiding the situation where the seal fails due to excessive wear of the rubber sealing ring 4.

[0026] The working principle of this embodiment is as follows: During use, through the cooperation of tension spring 9, push rod 7, and push block 8, tension spring 9 provides elastic force to push rod 7, causing push block 8 to tightly fit against the side of rubber sealing ring 4, thereby firmly fixing rubber sealing ring 4 in the corresponding position and applying a stable preload force to rubber sealing ring 4. During the operation of the coal mill, this effectively prevents rubber sealing ring 4 from shifting or deforming due to the rotation of the rotating shaft or other external forces, further enhancing the sealing effect, reducing leakage of the internal medium of the coal mill, thus ensuring the stable operation of the coal mill, improving its working efficiency, and through push rod 7, connecting... The design of rod 11, connecting plate 12, contact block 13, and trigger alarm 14 is such that when the rubber sealing ring 4 gradually wears down over time, the top block 8 will gradually move towards the center of the rubber sealing ring 4 under the action of tension spring 9. The top rod 7, connecting rod 11, and connecting plate 12 connected to it will also move synchronously. When the rubber sealing ring 4 wears down to a certain extent, the contact block 13 will trigger the switch of the trigger alarm 14, and the trigger alarm 14 will emit an alarm signal, thereby promptly reminding the operator that the rubber sealing ring 4 needs to be replaced, avoiding the situation where the seal fails due to excessive wear of the rubber sealing ring 4.

[0027] 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 technical solution of the present utility model.

Claims

1. A coal mill air ring sealing structure, comprising a coal mill drive disc (1), characterized in that: The lower surface of the coal mill drive disc (1) is fixedly installed with an upper seal (2), the lower surface of the upper seal (2) is provided with a lower seal (3), the upper seal (2) is provided with a rubber sealing ring (4), the surface of the rubber sealing ring (4) is provided with a sealing groove (5), the upper seal (2) is fixedly installed with an installation sleeve (6), the installation sleeve (6) is slidably connected with a top rod (7), one end of the top rod (7) is fixedly installed with a top block (8), and the installation sleeve (6) is provided with a tension spring (9).

2. The coal mill air ring sealing structure according to claim 1, characterized in that: The upper seal (2) and the lower seal (3) are connected and fixed by a positioning pin (10).

3. The coal mill air ring sealing structure according to claim 1, characterized in that: One end of the tension spring (9) is fixedly connected to the inner side of the mounting sleeve (6), and one end of the tension spring (9) is fixedly connected to one end of the top rod (7).

4. The coal mill air ring sealing structure according to claim 1, characterized in that: The side of the top block (8) is in contact with the side of the rubber sealing ring (4), and the top block (8) is distributed in a ring shape inside the upper sealing member (2).

5. The coal mill air ring sealing structure according to claim 1, characterized in that: One end of the top rod (7) is fixedly connected to a connecting rod (11), one end of the connecting rod (11) is fixedly installed with a connecting plate (12), a contact block (13) is fixedly installed on the side of the connecting plate (12), and a trigger alarm (14) is fixedly installed on the side of the upper seal (2).

6. The coal mill air ring sealing structure according to claim 5, characterized in that: The connecting rod (11) is slidably connected to the mounting sleeve (6), and the connecting rod (11) is slidably connected to the upper seal (2). The trigger switch of the trigger alarm (14) is coaxial with the central axis of the contact block (13).

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