Sealing structure for pull rod of coal mill
The seal structure for coal mills addresses the issue of foreign particle ingress by creating a positive pressure environment, enhancing seal integrity and extending component lifespan.
Patent Information
- Application Number
- CN202422263858.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-15
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-15
AI Technical Summary
In the existing coal grinder pull rod sealing structure, the gap between the movable parts and the stationary parts leads to insufficient sealing, resulting in the entry of hard particles such as gravel and iron filings in the coal, causing wear and shortening the service life.
A seal is installed in the cone cap and fixed with a sealing plate. A vent hole is added to connect it with the air pump to form a positive pressure environment. The debris are swept through the vent holes, the gap between the moving parts and the stationary parts is reduced, and the sealing is improved by using a rubber ring and a copper sleeve.
It significantly improves sealing performance, prevents hard particles from entering, extends the service life of the coal mill pull rods and related components, and maintains the smooth and reliable operation of the coal mill.
Smart Images
Figure CN223105259U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sealing structures, in particular to a pull rod sealing structure for a coal mill. Background Art
[0002] The existing upper seal of the pull rod of the coal mill is mainly an improved rubber seal for the pull rod. Its disadvantages are as follows: there is a certain gap between the moving part and the static part of the metal shell of the upper seal of the pull rod. This gap is used to ensure flexible movement. At present, this part is mainly sealed by the pull rod sealing air. From a structural point of view, the pull rod sealing air cannot meet the sealing performance of this part. Therefore, it is inevitable that coal stones, iron filings, etc. will enter through this gap. Over time, the moving and static parts will be severely worn. The stones and iron filings enter the pull rod chamber from this part, resulting in friction between the pull rod and the rubber seal, and ultimately leading to wear of the pull rod and the pull rod seal, reducing their service life. Summary of the Utility Model
[0003] Aiming at the deficiencies in the prior art, the utility model provides a pull rod sealing structure for a coal mill. To achieve the above purpose, the utility model adopts the following technical solutions:
[0004] A pull rod sealing structure for a coal mill includes a bottom plate, a pull rod, a flange plate, a tapered cap, a seal, a sealing plate, a steel pipe and an air pump. The bottom plate is fixed on the coal mill, and a connection hole is provided on the bottom plate. The pull rod is slidably arranged at the connection hole. The tapered cap is slidably connected to the pull rod, and an annular groove is provided on the outer wall of the tapered cap. The flange plate is fixed on the bottom plate and is stuck in the groove. The seal is arranged in the tapered cap and surrounds the pull rod. The sealing plate is fixed on the tapered cap to fix the seal. The flange plate is provided with a ventilation hole leading to the gap between the flange plate and the bottom plate. The steel pipe is fixed on the flange plate and communicates with the ventilation hole. The steel pipe is connected to the air pump through a hose.
[0005] Furthermore, an annular copper sleeve is clamped at the connection between the sealing plate and the pull rod, and the copper sleeve is slidably connected to the pull rod.
[0006] Furthermore, the seal adopts a rubber ring that fits the concave cavity of the tapered cap.
[0007] Furthermore, the ventilation hole and the steel pipe are annularly arranged around the flange plate.
[0008] Furthermore, a wear-resistant sleeve is sleeved outside the steel pipe.
[0009] Furthermore, the sleeve is welded to the steel pipe, and the end of the sleeve is welded to the barrel wall of the coal mill.
[0010] Compared with the prior art, the utility model has the following beneficial effects:
[0011] 1. By setting a seal inside the conical cap and fixing it with a sealing plate, the gap between the moving part and the stationary part can be effectively reduced, thus significantly improving the sealing performance of the entire pull rod sealing structure.
[0012] 2. By adding ventilation holes on the flange and connecting the ventilation holes to an air pump, a positive pressure environment can be formed, effectively preventing hard particles such as stones and iron filings in the coal from entering the pull rod chamber and protecting the pull rod and its seal from wear.
[0013] 3. Since it can effectively prevent the wear of the pull rod and the seal by hard particles, the proposed sealing structure can significantly extend the service life of the pull rod and related components of the coal mill. By reducing the interference of impurities such as stones and iron filings on the system, it helps to maintain the stability and reliability of the operation of the coal mill. Brief Description of the Drawings
[0014] The following further describes the present utility model in conjunction with the drawings and embodiments:
[0015] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the present utility model.
[0016] In the above-mentioned drawings: bottom plate 1, pull rod 2, flange 3, conical cap 4, seal 5, sealing plate 6, steel pipe 7, groove 8, ventilation hole 9, hose 10, copper sleeve 11, sleeve 12, barrel wall 13. Detailed Embodiment
[0017] The following further describes the technical solutions in the present utility model in conjunction with the drawings and embodiments.
[0018] Please refer to Figure 1 As shown, a sealing structure for the pull rod of a coal mill includes a bottom plate 1, a pull rod 2, a flange 3, a conical cap 4, a seal 5, a sealing plate 6, a steel pipe 7 and an air pump. The bottom plate 1 is fixed on the coal mill, and a connection hole is opened on the bottom plate 1. The pull rod 2 is slidably arranged at the connection hole. The conical cap 4 is slidably connected to the pull rod 2, and an annular groove 8 is arranged on the outer wall of the conical cap 4. The flange 3 is fixed on the bottom plate 1 and is stuck in the groove 8. The seal 5 is arranged inside the conical cap 4 and surrounds the pull rod 2. The sealing plate 6 is fixed on the conical cap 4 for fixing the seal 5. The flange 3 is provided with a ventilation hole 9 leading to the gap between the flange 3 and the bottom plate 1. The steel pipe 7 is fixed on the flange 3 and communicates with the ventilation hole 9. The steel pipe 7 is connected to the air pump through a hose 10.
[0019] Working principle: By arranging a seal 5 inside the conical cap 4 and fixing it with a sealing plate 6, the gap between the moving parts and the stationary parts can be effectively reduced, thereby significantly improving the sealing performance of the entire sealing structure of the pull rod 2. By adding a ventilation hole 9 on the flange 3 and connecting the ventilation hole 9 to an air pump, the air pump fills compressed air into the gap between the flange 3 and the bottom plate 1, which can form a positive pressure environment for purging debris at the edge of the gap, optimize the sealing effect of this part, extend the service life of the seal of the mill pull rod 2, and reduce the frequency of powder leakage and particle leakage.
[0020] In this embodiment, please refer to Figure 1 As shown, an annular copper sleeve 11 is clamped at the connection between the sealing plate 6 and the pull rod 2, and the copper sleeve 11 is slidably connected to the pull rod 2. The copper sleeve 11 is used to enhance the sealing effect of the sealing plate 6 on the pull rod 2.
[0021] In this embodiment, please refer to Figure 1 As shown, the seal 5 is a rubber ring that fits the concave cavity of the conical cap 4. Rubber is used for sealing to improve the sealing performance of the pull rod 2.
[0022] In this embodiment, please refer to Figure 1 As shown, the ventilation holes 9 and the steel pipes 7 are arranged in a ring around the flange 3. Blow air into the gap between the flange 3 and the bottom plate 1 from different angles to avoid residual debris.
[0023] In this embodiment, please refer to Figure 1 As shown, a wear-resistant sleeve 12 is sleeved outside the steel pipe 7. To protect the steel pipe 7 and improve its durability.
[0024] In this embodiment, please refer to Figure 1 As shown, the sleeve 12 is welded to the steel pipe 7, and the end of the sleeve is welded to the barrel wall 13 of the mill. To improve the connection firmness between the sleeve 12 and the steel pipe 7.
[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.
Claims
1. A seal structure for the pull rod of a coal mill, characterized in that, It includes a bottom plate, a pull rod, a flange, a cone cap, a seal, a sealing plate, a steel pipe and an air pump. The bottom plate is fixed on the coal mill, and a connection hole is provided on the bottom plate. The pull rod is slidably arranged at the connection hole. The cone cap is slidably connected to the pull rod, and an annular groove is provided on the outer wall of the cone cap. The flange is fixed on the bottom plate and clamped in the groove. The seal is arranged in the cone cap and encloses the pull rod. The sealing plate is fixed on the cone cap for fixing the seal. A ventilation hole leading to the gap between the flange and the bottom plate is provided on the flange. The steel pipe is fixed on the flange and communicated with the ventilation hole, and the steel pipe is connected to the air pump through a hose.
2. The coal mill pull rod sealing structure according to claim 1, characterized in that: An annular copper sleeve is clamped at the connection between the sealing plate and the pull rod, and the copper sleeve is slidably connected to the pull rod.
3. A sealing structure for the pull rod of a coal mill according to claim 1, characterized in that: The seal is a rubber ring matched with the concave cavity of the cone cap.
4. A seal structure for the pull rod of a coal mill according to claim 1, characterized in that: The ventilation holes and the steel pipe are arranged in a ring around the flange.
5. A sealing structure for a coal mill pull rod according to claim 1, characterized in that: A wear-resistant sleeve is sleeved outside the steel pipe.
6. The coal mill pull rod sealing structure according to claim 5, characterized in that: The sleeve is welded to the steel pipe, and the end of the sleeve is welded to the barrel wall of the coal mill.