An external heating rotary kiln sealing device

Abstract

The utility model discloses an outer hot type rotary kiln sealing device belongs to rotary kiln sealing technical field. The sealing device includes two groups of graphite packing assembly along the interval distribution of rotary kiln cylinder axis direction, and sealing support subassembly includes apron, two inner end presser plate and two outer end presser plate, wherein, the inner end presser plate is set up in the opposite inner end of two groups of graphite packing assembly one -to -one, and the outer end presser plate is located the opposite outer end of two groups of graphite packing assembly, and is used for with rotary kiln tail cover fixed connection, and the apron is set up in the outside of inner end presser plate and is located between two outer end presser plates, and the inner end presser plate, the apron and the corresponding outer end presser plate between enclose and form packing accommodating chamber, and the elastic compression subassembly is located between two adjacent inner end presser plates and is close to the inner side setting of inner end presser plate, is used for to the inner end presser plate is pressed tightly. The scheme utilizes elastic compression subassembly to make inner end presser plate inner side and graphite packing assembly better and fit, thereby improves the sealing property of inner end presser plate to graphite packing assembly.

Description

Technical Field

[0001] This utility model relates to the field of rotary kiln sealing technology, and more specifically, to an externally heated rotary kiln sealing device. Background Technology

[0002] For rotary kilns, the sealing performance between the kiln shell and the sealing cover significantly affects the operational stability of the rotary kiln system.

[0003] Existing packing assembly end-tightening seals generally employ a combination of adjusting screw tightening and spring adjustment to maintain the preload on the packing assembly. For example, Chinese patent application CN 208651622 U discloses a packing device for sealing rotating flue gas ducts. In this application, the sealing part includes two graphite packings, a packing gland, a pressure ring, a bushing, a spring-loaded bolt, and a base fixedly connected to the end of a stationary end cover. The packing gland is connected to the base via the spring-loaded bolt. Two graphite packings are positioned between the packing gland and the base, and a pressure ring is positioned between the two graphite packings. The pressure ring has vent holes forming interconnected nitrogen sealing chambers, and a nitrogen inlet is connected to the outside of the nitrogen sealing chambers.

[0004] There are some existing studies on the compression sealing of packing assemblies, which optimize the compression sealing of the outer wall of the packing assembly based on the above-mentioned types of applications. For example, Chinese patent application with publication number CN221077188U discloses a rotary kiln airbag sealing device and a rotary kiln. This application uses a combination of elastic wear-resistant packing assembly and elastic heat-insulating packing assembly to improve the high-temperature resistance of the airbag and further enhance the compression effect on the cylinder wall of the packing assembly.

[0005] However, during the hot operation of the rotary kiln, the pressure rings or plates used in the packing assemblies of the above two types of applications cannot well adapt to the deformation of the inner side of the adjacent ends of the two sets of graphite packings. Therefore, they cannot closely fit with the inner end face of the packing assembly, resulting in insufficient clamping force on the graphite packing at this point, and consequently reducing the clamping and sealing strength of the inner end of the packing. Utility Model Content

[0006] 1. Technical problems to be solved To address the technical problem that the sealing effect of the inner end face of existing graphite packing needs further improvement, this utility model proposes an externally heated rotary kiln sealing device. This solution optimizes the sealing support design at the end of the graphite packing assembly, utilizing the elastic deformation of a compression spring to maintain a better fit between the inner side of the inner end pressure plate and the graphite packing assembly, thereby improving the sealing performance of the inner end pressure plate on the graphite packing assembly.

[0007] 2. Technical solutions adopted To achieve the above objectives, the technical solution provided by this utility model is as follows: This utility model provides an externally heated rotary kiln sealing device, which includes a sealing support assembly, an elastic compression assembly, and two sets of graphite packing assemblies spaced apart along the axis of the rotary kiln body. The graphite packing assemblies are used to be fitted onto the outside of the rotary kiln body. The sealing support assembly includes a cover plate, two inner end pressure plates, and two outer end pressure plates that are fixedly connected. The inner end pressure plates are correspondingly arranged at the inner ends of the two sets of graphite packing assemblies, and the outer end pressure plates are located at the outer ends of the two sets of graphite packing assemblies. The outer end pressure plate near the rotary kiln tail cover is used to be fixedly connected to the rotary kiln tail cover. The cover plate is fitted onto the outside of the inner end pressure plates and located between the two outer end pressure plates. The inner end pressure plates, the cover plate, and the corresponding outer end pressure plates form packing receiving cavities corresponding to the two sets of graphite packing assemblies, which are used to compress and limit the graphite packing assemblies. The elastic compression assembly is located between two adjacent inner end pressure plates and is arranged near the inner side of the inner end pressure plates, which is used to compress the inner end pressure plates.

[0008] Furthermore, the elastic compression assembly includes multiple compression springs spaced apart along the circumferential direction of the rotary kiln tail cover, with the multiple compression springs disposed between two inner end pressure plates.

[0009] Furthermore, the elastic compression assembly also includes guide rods corresponding to the compression springs. The compression springs are sleeved on the outside of the guide rods. Each of the two inner end pressure plates has multiple grooves spaced apart along its circumference at adjacent ends. The two ends of the guide rods are placed in the corresponding grooves of the two inner end pressure plates and can slide relative to the grooves along the axis of the rotary kiln body.

[0010] Furthermore, an inert gas containment chamber is formed between two adjacent packing assemblies. The cover plate is provided with a through hole corresponding to the inert gas containment chamber. One end of the second air inlet pipe is inserted into the interior of the inert gas containment chamber through the through hole in the cover plate to supply gas to the inert gas containment chamber.

[0011] Furthermore, the cover plate has end connecting plates extending outward at both ends, and the end connecting plates are fixedly connected to the corresponding outer end pressure plates.

[0012] Furthermore, the packing cavity is also equipped with an airbag compression assembly, which is located on the outside of the graphite packing assembly and is used to compress the outer wall of the graphite packing assembly.

[0013] Furthermore, the airbag compression assembly includes an airbag and a first air inlet pipe. The cover plate is provided with a through hole corresponding to the first air inlet pipe, and one end of the first air inlet pipe is inserted into the interior of the airbag through the through hole in the cover plate.

[0014] Furthermore, each graphite packing assembly includes two graphite packing units arranged along the axis of the rotary kiln body, and each graphite packing unit is equipped with a corresponding airbag clamping assembly.

[0015] Furthermore, each graphite packing unit includes a wear-resistant packing and a heat-insulating packing, wherein the heat-insulating packing is fitted onto the outer wall of the wear-resistant packing.

[0016] Compared with the prior art, the technical solution provided by this utility model has the following advantages: (1) This utility model optimizes the compression sealing design of the graphite packing assembly ends. Specifically, the elastic compression component is located between two adjacent inner end pressure plates and is positioned close to the inner side of the inner end pressure plates to compress them. The elastic deformation of the elastic compression component adapts to minor adjustments in the distance between the inner sides of the two inner end pressure plates, maintaining a high compression force on the end face of the inner end pressure plates, thereby ensuring the compression sealing performance of the inner end pressure plates on the ends of the two adjacent graphite packing assemblies. Furthermore, when the graphite packing assembly experiences slight wear, the elastic compression component pushes the inner side of the inner end pressure plate to rotate relative to its outer side towards the graphite packing assembly, thus still maintaining the compression sealing on the end face of the inner end pressure plate. In addition, the elastic compression component can simultaneously improve the sealing performance of the two adjacent graphite packing assemblies.

[0017] (2) The present invention further optimizes the design of the elastic compression assembly. Specifically, the elastic compression assembly includes multiple compression springs, which are sleeved on the outside of the guide rod. The adjacent ends of the two inner end pressure plates are provided with multiple grooves spaced apart along their circumference. The two ends of the guide rod are placed in the corresponding grooves of the two inner end pressure plates and can slide relative to the grooves along the axis of the rotary kiln body. The guide rod guides the elastic deformation of the compression springs, and the guide rod can slide relative to the grooves along the axis of the rotary kiln body to prevent the guide rod from restricting the elastic deformation of the compression springs along the axis of the rotary kiln body and the small-amplitude rotation of the inner side of the inner end pressure plate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the installation of the externally heated rotary kiln sealing device according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the externally heated rotary kiln sealing device according to an embodiment of the present invention.

[0020] Figure 3 for Figure 2 A schematic diagram of a local part of the structure.

[0021] Figure 4 This is a schematic diagram of the cross-sectional structure of the externally heated rotary kiln sealing device in an embodiment of this utility model.

[0022] Label Explanation: 1. Rotary kiln tail hood; 2. Rotary kiln cylinder; 301. Outer end pressure plate; 302. Airbag clamping assembly; 303. First air intake pipe; 304. Graphite packing assembly; 305. Second air intake pipe; 306. Inner end pressure plate; 307. Guide rod; 308. Compression spring; 309. Cover plate; 310. Connecting bolt; 311. End connecting plate. Detailed Implementation

[0023] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0024] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0025] Regarding the description of direction, unless otherwise specified, the term "end" in the following embodiments refers to both ends along the axis of the rotary kiln body 2; the term "lateral" refers to the radial direction along the rotary kiln body 2, which is perpendicular to the axis of the rotary kiln body 2. The side of any component closer to the axis of the rotary kiln body 2 is called its inner side, and the side of the component farther from the axis of the rotary kiln body 2 is called its outer side. For example, refer to... Figure 2 From this perspective, the bottom of the outer end pressure plate 306 is called its inner side, and its top is called its outer side.

[0026] This embodiment provides an externally heated rotary kiln sealing device, see reference. Figure 1 , Figure 2As shown, the rotary kiln includes a sealing support assembly, an elastic compression assembly, and two sets of graphite packing assemblies 304 spaced apart along the axis of the rotary kiln body 2. The graphite packing assemblies 304 are used to fit over the outside of the rotary kiln body 2. The sealing support assembly includes a cover plate 309 fixedly connected to the rotary kiln body 2, two inner end pressure plates 306, and two outer end pressure plates 301. The inner end pressure plates 306 are correspondingly arranged at the inner ends of the two sets of graphite packing assemblies 304, and the outer end pressure plates 301 are located at the outer ends of the two sets of graphite packing assemblies 304, close to the tail cover of the rotary kiln. The outer end pressure plate 301 is used to be fixedly connected to the rotary kiln tail cover 1. The cover plate 309 is sleeved on the outside of the inner end pressure plate 306 and located between the two outer end pressure plates 301. The inner end pressure plate 306, the cover plate 309 and the corresponding outer end pressure plate 301 form a packing receiving cavity corresponding to the two sets of graphite packing assemblies 304 respectively, which is used to press and limit the graphite packing assembly 304. The elastic compression assembly is located between two adjacent inner end pressure plates 306 and is set on the inner side of the inner end pressure plate 306, which is used to press the inner end pressure plate 306.

[0027] The cover plate 309 presses the outer wall of the graphite packing assembly 304, while the outer end pressure plate 301 and the inner end pressure plate 306 press the ends of the graphite packing assembly 304 respectively.

[0028] Generally, both the inner end pressure plate 306 and the outer end pressure plate 301 are perpendicular to the axis of the rotary kiln cylinder 2, used to press and seal the end face of the graphite packing assembly 304. It should be noted that the outer side of the inner end pressure plate 306 is fixedly connected to the rotary kiln tail cover 1 via the cover plate 309 and the outer end pressure plate 301 in sequence. Therefore, the outer side of the inner end pressure plate 306 has good rigidity. Conversely, the inner side of the inner end pressure plate 306, lacking direct contact with any supporting components, has relatively poor rigidity. Without the compression spring 308, the inner side of the inner end pressure plate 306, under the force of the graphite packing assembly 304, will rotate relative to its outer side away from the graphite packing assembly 304, thus failing to provide a good pressing effect on the inner end face of the graphite packing assembly 304. Furthermore, when the graphite packing assembly 304 is deformed or slightly worn, the end face of the inner end plate 306 near the graphite packing assembly 304 cannot fit better with the graphite packing assembly 304.

[0029] This invention utilizes an elastic compression component between two adjacent inner end pressure plates 306. The elastic deformation of this component adapts to minor adjustments in the distance between the inner sides of the two inner end pressure plates 306, maintaining a high clamping force on the end faces of the two adjacent inner end pressure plates 306. This ensures a tight seal between the end of the inner end pressure plate 306 and the ends of the two adjacent graphite packing assemblies 304. Furthermore, when the graphite packing assembly 304 is worn, the elastic compression component can also push the inner side of the inner end pressure plate 306 to rotate relative to its outer side towards the graphite packing assembly 304, thus still maintaining a tight seal on the end face of the inner end pressure plate 306.

[0030] Preferably, the elastic compression assembly includes a plurality of compression springs 308 spaced apart along the circumferential direction of the rotary kiln tail hood 1, with each compression spring 308 disposed between two inner end pressure plates 306. The two ends of each compression spring 308 press against the opposite end faces of the two inner end pressure plates 306. Regarding the installation method of the compression springs 308, both ends of each compression spring 308 can be directly and fixedly connected to the two inner end pressure plates 306.

[0031] Further preferred options, refer to Figure 2 , Figure 3 , Figure 4 As shown, the elastic compression assembly also includes multiple guide rods 307 corresponding to multiple compression springs 308. The compression springs 308 are sleeved on the outside of the guide rods 307. Each of the adjacent ends of the two inner end pressure plates 306 is provided with multiple grooves spaced apart along their circumference. The two ends of the guide rods 307 are placed in the corresponding grooves of the two inner end pressure plates 306 and can slide relative to the grooves along the axis of the rotary kiln shell 2. The guide rods 307 are used to guide the elastic deformation of the compression springs 308. Sliding the guide rods 307 relative to the grooves along the axis of the rotary kiln shell 2 can maintain close contact between the two end faces of the compression springs 308 and the adjacent ends of the inner end pressure plates 306. At the same time, it can also prevent the guide rods 307 from restricting the elastic deformation of the compression springs 308 along the axis of the rotary kiln shell 2 and prevent the guide rods 307 from restricting the small-amplitude rotation of the inner side of the inner end pressure plates 306.

[0032] Specifically, an inert gas containment chamber is formed between two adjacent packing assemblies 304. A through-hole corresponding to the inert gas containment chamber is provided on the cover plate 309. One end of the second air inlet pipe 305 is inserted into the interior of the inert gas containment chamber through the through-hole in the cover plate 309 to supply gas to the inert gas containment chamber. Inert gas is introduced into the interior of the inert gas containment chamber through the second air inlet pipe 305, and the inert gas containment chamber is maintained at a slight positive pressure to prevent gas leakage from inside the rotary kiln.

[0033] The two packing assemblies 304 are symmetrically arranged with respect to the central axis of the inert gas containment cavity, which is beneficial to the uniformity of the force on the two packing assemblies 304.

[0034] As a further preferred embodiment of any of the above embodiments, both ends of the cover plate 309 are provided with end connecting plates 311 extending outward, and the end connecting plates 311 are fixedly connected to the corresponding outer end pressure plates 301. Preferably, the cover plate 309 is formed by splicing two semi-cylindrical steel plates. That is, the inner end pressure plate 306 is fixedly connected to the rotary kiln tail cover 1 in sequence through the cover plate 309, the outer end pressure plate 301, and the end connecting plates 311.

[0035] Generally, the end connecting plate 311 and the outer end pressure plate 301 are fixedly connected by connecting bolts 310.

[0036] The end connecting plate 311 and the cover plate 309 can be integrally formed or welded together.

[0037] Preferably, the outer sides of the cover plate 309 and the inner end pressure plate 306 are welded together to form a fixed connection between the two.

[0038] In some embodiments, the packing cavity is further provided with an airbag pressing assembly 302, which is located on the outside of the graphite packing assembly 304 and is used to press the outer wall of the graphite packing assembly 304.

[0039] Specifically, the airbag compression assembly 302 includes an airbag and a first air inlet pipe 303. A through hole corresponding to the first air inlet pipe 303 is provided on the cover plate 309. One end of the first air inlet pipe 303 is inserted into the airbag through the through hole in the cover plate 309. The airbag is inflated through the first air inlet pipe 303 to change its volume, thereby maintaining the compression force on the graphite packing assembly 304. The method of inflating the airbag to change its volume is existing technology and will not be described in detail here.

[0040] As an extension, each graphite packing assembly 304 includes two graphite packing units arranged along the axis of the rotary kiln cylinder 2, and each graphite packing unit is equipped with a corresponding airbag clamping assembly 302. This arrangement increases the sealing area of ​​each graphite packing assembly 304 while avoiding the need for too many airbag clamping assemblies 302 in each assembly, thereby reducing the instability of lateral clamping in each graphite packing assembly 304.

[0041] As a further extension, each graphite packing unit includes a wear-resistant packing and a heat-insulating packing, wherein the heat-insulating packing is fitted onto the outer wall of the wear-resistant packing.

[0042] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An externally heated rotary kiln sealing device, comprising a sealing support assembly, an elastic compression assembly, and two sets of graphite packing assemblies (304) spaced apart along the axial direction of the rotary kiln shell (2), wherein the graphite packing assemblies (304) are used to be sleeved on the outside of the rotary kiln shell (2), characterized in that, The sealing support assembly includes a cover plate (309), two inner end pressure plates (306), and two outer end pressure plates (301) that are fixedly connected. The inner end pressure plates (306) are respectively arranged at the inner ends of the two sets of graphite packing assemblies (304), and the outer end pressure plates (301) are located at the outer ends of the two sets of graphite packing assemblies (304). The outer end pressure plates (301) near the rotary kiln tail cover (1) are used to be fixedly connected to the rotary kiln tail cover (1). The cover plate (309) is sleeved on the outside of the inner end pressure plates (306) and located between the two outer end pressure plates (301). The inner end pressure plates (306), the cover plate (309), and the corresponding outer end pressure plates (301) form a packing receiving cavity corresponding to the two sets of graphite packing assemblies (304) respectively, which is used to press and limit the graphite packing assemblies (304). The elastic compression component is located between two adjacent inner end pressure plates (306) and close to the inner side of the inner end pressure plate (306), and is used to press the inner end pressure plate (306).

2. The externally heated rotary kiln sealing device according to claim 1, characterized in that, The elastic compression assembly includes multiple compression springs (308) spaced apart along the circumferential direction of the rotary kiln tail cover (1), with the multiple compression springs (308) all disposed between two inner end pressure plates (306).

3. The externally heated rotary kiln sealing device according to claim 2, characterized in that, The elastic compression assembly also includes guide rods (307) corresponding to the compression springs (308). The compression springs (308) are sleeved on the outside of the guide rods (307). The adjacent ends of the two inner end pressure plates (306) are provided with multiple grooves distributed at intervals along their circumference. The two ends of the guide rods (307) are placed in the corresponding grooves of the two inner end pressure plates (306) and can slide relative to the grooves along the axis of the rotary kiln body (2).

4. The externally heated rotary kiln sealing device according to claim 1, characterized in that, The two adjacent packing assemblies (304) form an inert gas containment cavity. The cover plate (309) is provided with a through hole corresponding to the inert gas containment cavity. One end of the second air inlet pipe (305) is inserted into the interior of the inert gas containment cavity through the through hole in the cover plate (309) to supply gas to the inert gas containment cavity.

5. The externally heated rotary kiln sealing device according to any one of claims 1-4, characterized in that, The cover plate (309) has end connecting plates (311) extending outward at both ends, and the end connecting plates (311) are fixedly connected to the corresponding outer end pressure plates (301).

6. The externally heated rotary kiln sealing device according to claim 1, characterized in that, The packing cavity is further provided with an airbag compression assembly (302), which is located on the outside of the graphite packing assembly (304) and is used to compress the outer wall of the graphite packing assembly (304).

7. The externally heated rotary kiln sealing device according to claim 6, characterized in that, The airbag compression assembly (302) includes an airbag and a first air inlet pipe (303). The cover plate (309) is provided with a through hole corresponding to the first air inlet pipe (303). One end of the first air inlet pipe (303) is inserted into the airbag through the through hole in the cover plate (309).

8. The externally heated rotary kiln sealing device according to claim 6, characterized in that, Each graphite packing assembly (304) includes two graphite packing units arranged along the axis of the rotary kiln body (2), and each graphite packing unit is provided with a corresponding airbag pressing assembly (302).

9. The externally heated rotary kiln sealing device according to claim 8, characterized in that, Each graphite packing unit includes a wear-resistant packing and a heat-insulating packing, wherein the heat-insulating packing is fitted onto the outer wall of the wear-resistant packing.

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