Cement rotary kiln tail sealing structure

Abstract

The utility model discloses a cement rotary kiln kiln tail sealing structure, and the kiln tail of cement rotary kiln is equipped with the return spoon, one end of return spoon is connected with the kiln cylinder flange, and the other end is installed with the movable friction ring, the outer end of movable friction ring is equipped with the radial seal ring, and the movable friction ring is projected to the outer periphery of radial seal ring, and the fixed friction ring is pressed on the upper edge of movable friction ring and contacts radial seal ring, and the smoke chamber is equipped with the short section of the protruding annular structure, the outer end of short section is equipped with a circle of protruding packing, the end surface of radial seal ring is pressed on the packing, and the packing and fixed friction ring cooperate and clamp radial seal ring. The utility model discloses cement rotary kiln kiln tail sealing device, through optimizing sealing structure, improving bearing mode and lubricating system, improve sealing performance, prolong the life, and adapt to the deformation of kiln cylinder.

Description

Technical Field

[0001] This utility model relates to the field of cement production equipment technology. Background Technology

[0002] The rotary kiln is a core piece of equipment in cement production, and its kiln tail sealing performance directly affects production efficiency and energy consumption. Traditional kiln tail sealing devices mostly adopt a hanging rod-type load-bearing structure, which has problems such as complex installation, high space requirements, and difficulty in adapting to kiln shell deformation.

[0003] For example, the published document with publication number CN208936752U, publication date June 4, 2019, and patent title "Return Scoop of Rotary Kiln in Cement Clinker Calcination Equipment", discloses a return scoop for a rotary kiln in a cement clinker calcination equipment. The return scoop includes a return scoop body and a first ear and a second ear disposed on the return scoop body. The first ear and the second ear have an arc-shaped structure. The return scoop body has a receiving cavity. The first ear and the second ear are located in the receiving cavity and are symmetrically arranged. The axes of the first ear and the second ear are parallel to the axis of the return scoop body.

[0004] Traditional return scoop structures have low return efficiency, and the sealing device is difficult to lubricate and maintain. Therefore, a new type of kiln tail sealing device is needed to solve these problems. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to realize a sealing device for the kiln tail of a cement rotary kiln, which can improve sealing performance, extend service life, and adapt to the deformation of the kiln shell.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a sealing structure for the kiln tail of a cement rotary kiln, wherein a return scoop is provided at the kiln tail of the cement rotary kiln, one end of the return scoop is connected to the flange of the kiln body, and a movable friction ring is installed at the other end. A radial sealing ring is provided at the outer end of the movable friction ring, and the movable friction ring protrudes from the outer periphery of the radial sealing ring. A fixed friction ring presses against the upper edge of the movable friction ring and contacts the radial sealing ring. The smoke chamber is provided with a short section with a protruding annular structure, and a ring of packing is provided at the outer end of the short section. The end face of the radial sealing ring presses against the packing, and the packing and the fixed friction ring cooperate to clamp the radial sealing ring.

[0007] The fixed friction ring is constrained on the outer circumference of the movable friction ring by multiple clamping devices. The movable friction ring rotates with the kiln tail, while the packing and the fixed friction ring remain stationary relative to the kiln tail.

[0008] The pressing device has 8 evenly distributed around its circumference. The pressing device is a spring-type telescopic rod structure. One end of the pressing device is fixed to the outer wall of the smoke chamber, and the other end is provided with a pressing plate. The pressing plate is connected to a fixed friction ring, which constrains the movable friction ring on the outer circumferential surface, and provides a force in the direction of the smoke chamber to press the fixed friction ring against the radial sealing ring.

[0009] The kiln shell flange is equipped with a roller track, and the support seat at the kiln tail of the cement rotary kiln is equipped with rollers. The roller track is placed on the rollers and is supported by the rollers.

[0010] The periphery of the gap between the fixed friction ring and the radial sealing ring is provided with a lubricating oil inlet for injecting oil into the gap.

[0011] The lubricating oil inlet has six ports.

[0012] The return scoop adopts a hopper-type structure, which efficiently returns materials as the kiln cylinder rotates.

[0013] This utility model relates to a sealing device for the kiln tail of a cement rotary kiln. By optimizing the sealing structure, improving the load-bearing method and lubrication system, it enhances sealing performance, extends service life, and adapts to the deformation of the kiln shell. Attached Figure Description

[0014] The following is a brief explanation of the content and markings in each of the accompanying drawings in this utility model specification:

[0015] Figure 1 This is a schematic diagram of the kiln tail structure of a cement rotary kiln.

[0016] Figure 2 A partial schematic diagram of the kiln tail structure of a cement rotary kiln;

[0017] Figure 3 for Figure 2 Enlarged diagram of part A in the middle;

[0018] Figure 4 for Figure 3 Cross-sectional diagram;

[0019] The markings in the above figures are as follows: 1. Smoke chamber; 2. Kiln shell; 3. Kiln shell flange; 4. Movable friction ring; 5. Clamping device; 6. Radial sealing ring; 7. Fixed friction ring; 8. Packing; 9. Short section; 10. Return scoop; 11. Roller track. Detailed Implementation

[0020] The following description, with reference to the accompanying drawings, details the specific implementation of this utility model, including the shape and structure of each component, the relative positions and connections between the parts, the function and working principle of each part, the manufacturing process, and the operation and use methods. This will help those skilled in the art to have a more complete, accurate, and in-depth understanding of the inventive concept and technical solution of this utility model.

[0021] The sealing device for the kiln tail of a cement rotary kiln includes the following components:

[0022] Return scoop 10: One end of the return scoop 10 is connected to the kiln body flange 3, and the other end is equipped with a movable friction ring 4. The movable friction ring 4 rotates with the kiln body 2 to achieve dynamic sealing.

[0023] Fixed friction ring 7: The fixed friction ring 7 is connected to the radial sealing ring 6. The radial sealing ring 6 achieves circumferential sealing with the short section 9 of the smoke chamber 1 through the circumferential high-temperature packing 8. The fixed friction ring 7 and the movable friction ring 4 are pressed together by the clamping device 5 to form a seal at the joint between the static and dynamic parts.

[0024] Load-bearing structure: The fixed friction ring 7 and the radial sealing ring 6 bear the load through the contact of rollers and guide rails, replacing the traditional hanging rod type load-bearing structure, simplifying the installation process, reducing space requirements, and accommodating the large deformation of the kiln shell 2.

[0025] Lubrication system: The fixed friction ring 7 has 6 dry oil pipes on its back, which lubricate the friction ring with dry oil to extend its service life. At the same time, the dry oil acts as a coupling agent to enhance the sealing effect.

[0026] Clamping device 5: There are 8 clamping devices evenly distributed around the circumference. They adopt a spring-type structure and have the advantages of simple structure, long service life, easy maintenance and easy adjustment.

[0027] The structure of the return scoop 10: The return scoop 10 adopts a new hopper-type structure, which improves the return efficiency by 75% compared with the traditional structure and is suitable for most production lines.

[0028] Specifically, the sealing structure of the kiln tail of the cement rotary kiln is an improvement on the connection part of the kiln tail return scoop 10. One end of the return scoop 10 is fixedly connected to the kiln body flange 3. A roller track 11 is provided at the connection part between the kiln body 2 and the kiln body flange 3. Rollers are provided on the support seat of the kiln tail of the cement rotary kiln. The rollers support the kiln tail, and the roller track 11 is placed on the rollers and is supported by the rollers. When the rollers rotate, they can drive the kiln tail to rotate. The return scoop 10 adopts a hopper-type structure. During the working process, the return scoop 10 rotates with the kiln body 2 to efficiently return the material, significantly improving the return efficiency.

[0029] A movable friction ring 4 is installed at the other end of the return scoop 10. The return scoop 10 and the movable friction ring 4 are fixedly connected. A radial sealing ring 6 is provided at the outer end of the movable friction ring 4. The movable friction ring 4 and the radial sealing ring 6 are also fixedly connected. Both the radial sealing ring 6 and the movable friction ring 4 rotate together with the kiln body 2. The entire radial sealing ring 6 is a component that contacts the fixed part. After being lubricated with lubricant, it separates the movable part and the fixed part by frictional rotation. The movable friction ring 4 has an overall ring structure and is fixed at the outer end of the return scoop 10. The radial sealing ring 6 is also a ring structure, similar to the part extending from the outer end of the movable friction ring 4. The movable friction ring 4 and the radial sealing ring 6 form an annular groove. The fixed friction ring 7 presses on the upper edge of the movable friction ring 4 and contacts the radial sealing ring 6, that is, it is embedded in the groove to prevent the movable friction ring 4 from moving away from the smoke chamber 1.

[0030] The smoke chamber 1 is provided with a short section 9 with a protruding annular structure. The outer end of the short section 9 is provided with a ring of protruding packing 8, which is similar to a ring of limiting structure. The end face of the radial sealing ring 6 presses on the packing 8, and the outer end face of the packing 8 supports the radial sealing ring 6, preventing the movable friction ring 4 from moving towards the smoke chamber 1. This constitutes the structure in which the packing 8 and the fixed friction ring 7 cooperate to clamp the radial sealing ring 6.

[0031] The fixed friction ring 7 is constrained on the outer circumference of the movable friction ring 4 by multiple clamping devices 5. The movable friction ring 4 rotates with the kiln tail, and the packing 8 and the fixed friction ring 7 are stationary relative to the kiln tail. During operation, the movable friction ring 4 rotates with the kiln body 2 to achieve dynamic sealing. The fixed friction ring 7 and the radial sealing ring 6 are in contact with the roller and guide rail to bear the load. The radial sealing ring 6 achieves circumferential sealing with the short section 9 of the smoke chamber 1 through the high-temperature resistant packing 8.

[0032] Eight clamping devices 5 are evenly distributed around the circumference. Each clamping device 5 is a spring-type telescopic rod structure. One end of the clamping device 5 is fixed to the outer wall of the smoke chamber 1, and the other end is provided with a clamping plate. The clamping plate is connected to the fixed friction ring 7, which is constrained to the outer circumferential surface of the movable friction ring 4. The clamping plate provides a force in the direction of the smoke chamber 1 to press the fixed friction ring 7 against the radial sealing ring 6, thus pressing the fixed friction ring 7 and the movable friction ring 4 together to ensure a sealing effect.

[0033] The fixed friction ring 7 and the radial sealing ring 6 are provided with a lubricating oil inlet around the gap for injecting oil into the gap. The fixed friction ring 7 is provided with 6 dry oil pipes on its back. The friction ring is lubricated by dry oil, which extends its service life and enhances the sealing effect.

[0034] The advantages of the above-mentioned cement rotary kiln tail sealing device are:

[0035] Optimized load-bearing structure: The installation process is simplified by using rollers and guide rails for load bearing, which reduces the requirements for installation space and can adapt to the large deformation of the kiln shell 2, thereby improving the stability and adaptability of the device.

[0036] Improved material return efficiency: The material return scoop structure is adopted, which increases the material return efficiency by 75% compared with the traditional structure, significantly improving production efficiency.

[0037] Improved clamping device 5: The spring-type clamping device 5 has a simple structure, long service life, and is easy to maintain and adjust, thus reducing maintenance costs.

[0038] Lubrication system optimization: Lubrication is achieved through the dry oil pipe on the back of the fixed friction ring 7, which extends the service life of the friction ring. At the same time, the dry oil acts as a coupling agent to enhance the sealing effect.

[0039] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A sealing structure for the kiln tail of a cement rotary kiln, wherein a return scoop is provided at the kiln tail of the cement rotary kiln, characterized in that: One end of the return scoop is connected to the flange of the kiln body, and the other end is equipped with a movable friction ring. The outer end of the movable friction ring is provided with a radial sealing ring. The outer periphery of the radial sealing ring protrudes from the movable friction ring. The fixed friction ring presses on the upper edge of the movable friction ring and contacts the radial sealing ring. The smoke chamber is provided with a short section with a protruding annular structure. The outer end of the short section is provided with a ring of protruding packing. The end face of the radial sealing ring presses on the packing. The packing and the fixed friction ring cooperate to clamp the radial sealing ring.

2. The sealing structure for the kiln tail of a cement rotary kiln according to claim 1, characterized in that: The fixed friction ring is constrained on the outer circumference of the movable friction ring by multiple clamping devices. The movable friction ring rotates with the kiln tail, while the packing and the fixed friction ring remain stationary relative to the kiln tail.

3. The sealing structure for the kiln tail of a cement rotary kiln according to claim 2, characterized in that: The pressing device has 8 evenly distributed around its circumference. The pressing device is a spring-type telescopic rod structure. One end of the pressing device is fixed to the outer wall of the smoke chamber, and the other end is provided with a pressing plate. The pressing plate is connected to a fixed friction ring, which constrains the movable friction ring on the outer circumferential surface, and provides a force in the direction of the smoke chamber to press the fixed friction ring against the radial sealing ring.

4. The sealing structure for the kiln tail of a cement rotary kiln according to claim 1, 2, or 3, characterized in that: The kiln shell flange is equipped with a roller track, and the support seat at the kiln tail of the cement rotary kiln is equipped with rollers. The roller track is placed on the rollers and is supported by the rollers.

5. The sealing structure for the kiln tail of a cement rotary kiln according to claim 4, characterized in that: The periphery of the gap between the fixed friction ring and the radial sealing ring is provided with a lubricating oil inlet for injecting oil into the gap.

6. The sealing structure for the kiln tail of a cement rotary kiln according to claim 5, characterized in that: The lubricating oil inlet has six ports.

7. The sealing structure for the kiln tail of a cement rotary kiln according to claim 1 or 6, characterized in that: The return scoop adopts a hopper-type structure, which efficiently returns materials as the kiln cylinder rotates.

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