A rotary kiln head sealing device
Patent Information
- Application Number
- CN202522338802.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-04
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-11-04
AI Technical Summary
[0002]回转窑广泛应用于建材、冶金等领域，其窑头是旋转筒体与固定部件的衔接部位，需在动态工况下实现密封，现有密封多采用石墨块或鱼鳞片结构，石墨块易因高温磨损增大密封间隙，导致漏风漏料；鱼鳞片密封易受热胀冷缩影响失效，且两者拆装繁琐、维护频繁，这不仅破坏窑内温度场稳定性、增加能耗，还易引发环境粉尘污染，既影响生产效率，又抬高运维成本，难以适配回转窑长期高效运行需求，给人们的使用过程带来了一定的不利影响，为了解决现有技术的不足，我们提出一种回转窑窑头密封装置
该回转窑窑头密封装置，通过密封环与密封块的双重密封结构设计，有效提升窑头密封可靠性，其中密封环采用硅橡胶或氟橡胶耐高温弹性材料，外壁复合不锈钢编织网金属加强层，既能够适应回转窑高温工作环境保持弹性密封性能，又可增强结构抗撕裂强度，密封块与回转窑窑筒体内壁过盈配合，外表面喷涂的碳化钨-钴复合耐磨涂层，能显著降低两者相对转动时的磨损速率，同时螺栓端部的丁腈橡胶防滑垫可防止安装筒相对窑筒体移位，多重结构协同作用，可有效避免窑头漏风、漏料问题，适配回转窑动态运行工况。
Smart Images
Figure CN224838364U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of rotary kiln technology, and in particular to a rotary kiln head sealing device. Background Technology
[0002] Rotary kilns are widely used in building materials, metallurgy, and other fields. The kiln head is the connection point between the rotating cylinder and the stationary components, and it needs to be sealed under dynamic operating conditions. Existing seals mostly use graphite blocks or fish scale structures. Graphite blocks are prone to wear due to high temperatures, which increases the sealing gap and leads to air and material leakage. Fish scale seals are prone to failure due to thermal expansion and contraction. Moreover, both are cumbersome to disassemble and assemble and require frequent maintenance. This not only disrupts the stability of the temperature field inside the kiln and increases energy consumption, but also easily causes environmental dust pollution. This affects production efficiency and raises operation and maintenance costs, making it difficult to meet the long-term high-efficiency operation requirements of rotary kilns and bringing certain adverse effects to the use process. In order to overcome the shortcomings of existing technologies, we propose a rotary kiln head sealing device. Utility Model Content
[0003] The main purpose of this utility model is to provide a rotary kiln head sealing device, which can effectively solve the problems in the background art.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A rotary kiln head sealing device includes a rotary kiln shell. An installation cylinder is fitted onto the outer surface of the rotary kiln shell. The outer surface of the installation cylinder has a threaded groove, and bolts for fixing the installation cylinder are provided on both sides of the installation cylinder. A fixing ring is fixedly connected to one end of the installation cylinder, and an annular groove is formed on the surface of the fixing ring facing the installation cylinder. Snap-fit holes are formed on both sides of the fixing ring. A connecting cylinder is installed on the outer surface of the installation cylinder. The inner surface of the connecting cylinder has threads matching the threaded groove, and a fixing plate is fixedly connected to one end of the connecting cylinder. Sealing grooves are formed on the surfaces of the installation cylinder and the fixing plate facing the connecting cylinder, and a sealing ring is fitted between the two sealing grooves. A sealing block is fixedly connected to the center position of the surface of the fixing plate facing the connecting cylinder. Two fixing blocks are symmetrically fixed to the end of the connecting cylinder away from the fixing plate. A rectangular groove is formed in each fixing block, and a spring is detachably connected to the rectangular groove. The other end of the spring abuts against a limit plate, and a snap-fit block is fixedly connected to one end of the limit plate.
[0005] Preferably, the mounting cylinder has internal threaded holes on both sides that are compatible with the bolts. The bolts are fully threaded hexagonal head bolts. The ends of the bolts extend to the inside of the mounting cylinder and are fixedly connected to an anti-slip pad with glue. The anti-slip pad is made of nitrile rubber and has a diamond-shaped anti-slip pattern on the side of the anti-slip pad away from the bolts to increase the friction between the mounting cylinder and the rotary kiln cylinder.
[0006] Preferably, the mounting cylinder and the connecting cylinder are connected by a threaded groove and a threaded thread. The outer surface of the connecting cylinder is integrally formed with several anti-slip ridges evenly distributed along its axial direction, so that the operator can hold the connecting cylinder to rotate for installation or disassembly.
[0007] Preferably, the sealing ring is made of a high-temperature resistant elastic material, such as silicone rubber or fluororubber. The sealing ring has a circular cross-section, and its outer wall is reinforced with a metal layer, which is a stainless steel woven mesh layer, to enhance the structural strength and tear resistance of the sealing ring.
[0008] Preferably, the outer circumferential surface of the sealing block is interference-fitted with the inner wall of the rotary kiln shell, and the outer circumferential surface of the sealing block is coated with a wear-resistant coating, which is a tungsten carbide-cobalt composite coating, to reduce the wear rate when the sealing block rotates relative to the rotary kiln shell and extend the service life of the sealing assembly.
[0009] Preferably, the spring is a cylindrical helical compression spring, and the surface of the spring is coated with high-temperature resistant and rust-proof paint. The end of the snap-fit block away from the limiting plate is provided with a guide slope so that the snap-fit block can be quickly embedded into the snap-fit hole of the fixing ring.
[0010] Compared with the prior art, the present invention has the following beneficial effects: This rotary kiln head sealing device effectively improves the reliability of the kiln head seal through a dual sealing structure design of sealing ring and sealing block. The sealing ring is made of high-temperature resistant elastic material such as silicone rubber or fluororubber, and the outer wall is reinforced with a stainless steel woven mesh metal layer. This not only adapts to the high-temperature working environment of the rotary kiln and maintains elastic sealing performance, but also enhances the tear resistance of the structure. The sealing block is interference-fitted with the inner wall of the rotary kiln shell, and the tungsten carbide-cobalt composite wear-resistant coating sprayed on the outer surface can significantly reduce the wear rate when the two rotate relative to each other. At the same time, the nitrile rubber anti-slip pad at the end of the bolt can prevent the installation cylinder from shifting relative to the kiln shell. The synergistic effect of multiple structures can effectively avoid air and material leakage problems at the kiln head and is suitable for the dynamic operating conditions of the rotary kiln.
[0011] The rotary kiln head sealing device features an installation cylinder and a connecting cylinder connected by threaded grooves and threads. The connecting cylinder has an integrally formed anti-slip ridge on its outer wall, making it easy for operators to grip and rotate for installation. The guide slope at the end of the locking block, combined with the spring elastic reset function, allows the locking block to quickly embed into the locking hole of the fixing ring for positioning and locking, without the need for complicated auxiliary tools. During disassembly, simply pressing the locking block releases the lock. Combined with the threaded disassembly structure, the disassembly and assembly process is greatly simplified, shortening the working time. At the same time, the connection of each component is stable, reducing the frequency of subsequent maintenance and further reducing the operation and maintenance costs of the rotary kiln. Attached Figure Description
[0012] Figure 1This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the mounting cylinder structure of this utility model; Figure 3 This is a schematic diagram of the connecting cylinder structure of this utility model; Figure 4 This is an overall sectional view of the present invention; Figure 5 This is the utility model Figure 4 Schematic diagram of the structure at point A in the middle; Figure 6 This is a schematic diagram of the internal structure of the fixing block of this utility model.
[0013] In the diagram: 1. Rotary kiln body; 2. Mounting cylinder; 3. Threaded groove; 4. Bolt; 5. Fixing ring; 6. Annular groove; 7. Snap-fit hole; 8. Connecting cylinder; 9. Threaded teeth; 10. Fixing plate; 11. Sealing groove; 12. Sealing ring; 13. Sealing block; 14. Fixing block; 15. Rectangular groove; 16. Spring; 17. Limiting plate; 18. Snap-fit block. Detailed Implementation
[0014] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0015] Example 1, as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a rotary kiln head sealing device includes a rotary kiln body 1. An installation cylinder 2 is fitted onto the outer surface of the rotary kiln body 1. The outer circumferential surface of the installation cylinder 2 has a threaded groove 3, and its two sides have corresponding internal threaded holes adapted to fully threaded hexagonal head bolts 4. The end of the bolt 4 extends into the inner side of the installation cylinder 2 and is fixedly connected with a nitrile rubber anti-slip pad with a diamond-shaped anti-slip pattern by adhesive. A fixing ring 5 is integrally fixed to one end of the installation cylinder 2. The fixing ring 5 has an annular groove 6 facing the end face of the installation cylinder 2, and both sides of the fixing ring 5 have through-holes 7. The outer circumferential surface of the installation cylinder 2 is threadedly connected to the threaded teeth 9 on the inner circumferential surface of a connecting cylinder 8 through the threaded groove 3. The outer circumferential surface of the connecting cylinder 8 is integrally formed with several anti-slip ridges evenly distributed along its axial direction. A fixing plate 10 is integrally fixed to one end of the connecting cylinder 8. Sealing grooves 11 are formed on both the end face of the installation cylinder 2 near the fixing plate 10 and the end face of the fixing plate 10 facing the connecting cylinder 8. Between the two sealing grooves 11, there is a sealing ring 12 with a circular cross-section, made of high-temperature resistant elastic material of silicone rubber or fluororubber, and with a stainless steel braided mesh metal reinforcement layer on the outer wall. A sealing block 13 is also integrally fixed at the center of the end face of the fixing plate 10 facing the connecting cylinder 8. The outer circumferential surface of the sealing block 13 is interference-fitted with the inner wall of the rotary kiln cylinder 1, and the outer circumferential surface of the sealing block 13 is sprayed with a tungsten carbide-cobalt composite wear-resistant coating. Two fixing blocks 14 are symmetrically and integrally fixed at the end of the connecting cylinder 8 away from the fixing plate 10. Each fixing block 14 has a rectangular groove 15 inside. A cylindrical spiral compression spring 16 with a surface sprayed with high-temperature resistant and rust-proof paint is detachably connected in the rectangular groove 15. The other end of the spring 16 abuts against a limiting plate 17 that slides and adapts to the inner wall of the rectangular groove 15. A snap-fit block 18 with a guide slope at the end is integrally fixed at the end of the limiting plate 17 away from the spring 16, and the snap-fit block 18 can snap-fit with the snap-fit hole 7 of the fixing ring 5.
[0016] It should be noted that this utility model is a rotary kiln head sealing device. In use, first, the mounting cylinder 2 is movably fitted onto the outer surface of the rotary kiln body 1. Then, the fully threaded hexagonal head bolts 4 on both sides of the mounting cylinder 2 are tightened to securely fix the mounting cylinder 2 onto the outer surface of the rotary kiln body 1. Next, holding the anti-slip protrusions on the outside of the connecting cylinder 8, the connecting cylinder 8 is slowly screwed into the threaded groove 3 on the outer circumference of the mounting cylinder 2 through the threaded teeth 9 on its inner circumference. During the screwing process, the guide slope of the locking block 18 contacts and is pressed against the fixing ring 5, pushing the limiting plate 17 to slide within the rectangular groove 15 and compressing the cylindrical helical compression spring 16 until a seal is achieved. The ring 12 is fully embedded in the sealing groove 11 of the mounting cylinder 2 and the fixing plate 10 to form a radial seal. At the same time, the sealing block 13 forms an interference fit with the inner wall of the kiln body 1 to achieve an axial seal. At this time, the snap-fit block 18 pops out under the return force of the spring 16 and snaps into the snap-fit hole 7 of the fixing ring 5, completing the positioning and locking of the connecting cylinder 8 and the mounting cylinder 2. When the rotary kiln is running, the kiln body 1 drives the fixed mounting cylinder 2 to rotate synchronously. The sealing ring 12 in the sealing groove 11 ensures the sealing performance between the mounting cylinder 2 and the fixing plate 10. The bolt 4 and the anti-slip pad prevent the mounting cylinder 2 from shifting relative to the kiln body 1, thereby achieving a reliable seal at the kiln head.
[0017] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A rotary kiln head sealing device, comprising a rotary kiln cylinder (1), characterized in that: The rotary kiln shell (1) is fitted with an installation cylinder (2) on its outer surface. The outer surface of the installation cylinder (2) is provided with a threaded groove (3), and bolts (4) for fixing the installation cylinder (2) are provided on both sides of the installation cylinder (2). A fixing ring (5) is fixedly connected to one end of the installation cylinder (2), and an annular groove (6) is provided on the surface of the fixing ring (5) facing the installation cylinder (2). A snap-fit hole (7) is provided on both sides of the fixing ring (5). A connecting cylinder (8) is installed on the outer surface of the installation cylinder (2). The inner surface of the connecting cylinder (8) is provided with threads (9) that match the threaded groove (3), and a fixing plate (10) is fixedly connected to one end of the connecting cylinder (8). Sealing grooves (11) are provided on one end of the mounting cylinder (2) and the surface of the fixing plate (10) facing the connecting cylinder (8), and a sealing ring (12) is sleeved between the two sealing grooves (11). A sealing block (13) is fixedly connected to the center of the surface of the fixing plate (10) facing the connecting cylinder (8). Two fixing blocks (14) are symmetrically fixed on one end of the connecting cylinder (8) away from the fixing plate (10). A rectangular groove (15) is provided in the fixing block (14), and a spring (16) is detachably connected in the rectangular groove (15). The other end of the spring (16) abuts against the limiting plate (17), and a snap-fit block (18) is fixedly connected to one end of the limiting plate (17).
2. The rotary kiln head sealing device according to claim 1, characterized in that: The mounting cylinder (2) has internal threaded holes on both sides that are compatible with the bolt (4). The bolt (4) is a fully threaded hexagonal head bolt. The end of the bolt (4) extends to the inside of the mounting cylinder (2) and is fixedly connected to an anti-slip pad with glue. The anti-slip pad is made of nitrile rubber and has a diamond-shaped anti-slip pattern on the side of the anti-slip pad away from the bolt (4) to increase the friction between the mounting cylinder (2) and the rotary kiln cylinder (1).
3. The rotary kiln head sealing device according to claim 1, characterized in that: The mounting cylinder (2) and the connecting cylinder (8) are connected by a threaded groove (3) and a threaded tooth (9). The outer surface of the connecting cylinder (8) is integrally formed with several anti-slip ridges evenly distributed along its axial direction, so that the operator can hold the connecting cylinder (8) to rotate for installation or disassembly.
4. The rotary kiln head sealing device according to claim 1, characterized in that: The sealing ring (12) is made of high-temperature resistant elastic material, which is silicone rubber or fluororubber. The sealing ring (12) has a circular cross-section and a metal reinforcing layer on the outer wall of the sealing ring (12). The metal reinforcing layer is a stainless steel woven mesh layer to enhance the structural strength and tear resistance of the sealing ring (12).
5. A rotary kiln head sealing device according to claim 1, characterized in that: The outer circumferential surface of the sealing block (13) is interference-fitted with the inner wall of the rotary kiln shell (1). The outer circumferential surface of the sealing block (13) is sprayed with a wear-resistant coating, which is a tungsten carbide-cobalt composite coating, in order to reduce the wear rate when the sealing block (13) rotates relative to the rotary kiln shell (1) and extend the service life of the sealing assembly.
6. A rotary kiln head sealing device according to claim 1, characterized in that: The spring (16) is a cylindrical helical compression spring, and the surface of the spring (16) is coated with high temperature resistant and rust-proof paint. The end of the snap-fit block (18) away from the limiting plate (17) is provided with a guide slope so that the snap-fit block (18) can be quickly embedded into the snap-fit hole (7) of the fixing ring (5).