A kiln head sealing structure of a rotary kiln

Abstract

The utility model belongs to rotary kiln equipment technical field especially for a kiln head sealing structure of rotary kiln, including kiln body cylinder, kiln head casing, sealing bearing, hollow ring, air extractor, filter box, rotating seat, limiting component and support shaft, the sealing bearing fixedly covers and is equipped in the kiln body cylinder outside, the kiln head casing fixed mounting is in the outside of sealing bearing, the hollow ring fixed mounting is on the inner wall of kiln head casing and is located the side of sealing bearing and kiln body cylinder intercommunication, fixed mounting has a plurality of airflow nozzles one with hollow ring intercommunication and sets up the inclined shape on the inner periphery of hollow ring, a plurality of airflow nozzles one end away from hollow ring all tilt towards kiln head casing direction, the air extractor fixed mounting is on the kiln head casing. The utility model designs rationally, can form stable sealing air curtain, filters the replacement under the condition of not stopping simultaneously, and can be well adapted to high temperature working condition.

Description

Technical Field

[0001] This utility model relates to the technical field of rotary kiln equipment, and in particular to a kiln head sealing structure for a rotary kiln. Background Technology

[0002] As a core piece of equipment in industries such as building materials and metallurgy, rotary kilns require a sealed rotating connection between the fixed kiln head shell and the rotating kiln body to prevent the leakage of high-temperature dusty gas inside the kiln and to prevent the intrusion of cold air from the outside. This directly affects the thermal efficiency and operational stability of the equipment.

[0003] Existing kiln head seals mostly adopt contact-type structures (such as fish scale seals and graphite block seals), but such structures have obvious defects: the seals are easily worn due to long-term friction with the rotating kiln body, requiring frequent shutdowns for replacement, which increases operation and maintenance costs; and they are difficult to adapt to the inevitable axial movement and radial runout during kiln operation, which can easily generate sealing gaps and lead to seal failure.

[0004] While some non-contact sealing solutions can reduce wear, they often suffer from poor sealing performance due to unreasonable airflow path design, resulting in turbulent air curtains. At the same time, the accompanying dust filtration devices are mostly single-unit fixed types, and when the filter elements become clogged, the machine needs to be shut down for replacement, interrupting the supply of sealing air curtains and further reducing sealing reliability.

[0005] Therefore, this utility model proposes a kiln head sealing structure for rotary kilns to solve the above problems.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0007] The purpose of this utility model is to address the shortcomings mentioned in the background art by proposing a kiln head sealing structure for a rotary kiln.

[0008] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a kiln head sealing structure for a rotary kiln, comprising a kiln body cylinder, a kiln head shell, a sealing bearing, a hollow ring, an exhaust fan, a filter box, a rotating seat, a limiting component, and a support shaft; The sealed bearing is fixedly sleeved on the outside of the kiln body. The kiln head shell is fixedly installed on the outside of the sealed bearing. The hollow ring is fixedly installed on the inner wall of the kiln head shell and located on the side where the sealed bearing communicates with the kiln body. Multiple airflow nozzles, connected to the hollow ring and arranged at an angle, are fixedly installed on the inner circumference of the hollow ring. The ends of the multiple airflow nozzles away from the hollow ring are all inclined towards the kiln head shell. The exhaust fan is fixedly installed on the kiln head shell. Multiple connecting pipes, connected to the hollow ring, are fixedly installed on the kiln head shell. A single annular pipe is fixedly installed on each of the multiple connecting pipes. The exhaust fan's outlet is connected to an annular pipe. The filter box is fixedly installed on the kiln head shell. An air inlet pipe connected to the kiln head shell is fixedly installed at the bottom of the filter box. The exhaust fan's inlet is connected to the filter box from above and is on the same axis as the air outlet of the air inlet pipe. The support shaft is rotatably installed on the top and bottom inner walls of the filter box. The rotating seat is fixedly installed on the support shaft and is in movable sealing contact with the inner side wall of the filter box. Multiple high-temperature dust filters for air intake filtration are installed inside the rotating seat. The limiting component is located at the top of the support shaft and connected to the top of the filter box.

[0009] Preferably, the limiting component includes a limiting pin, a turntable, a retaining ring, and a return spring. The top end of the support shaft extends above the filter box and is fixedly mounted on the turntable. A limiting pin is slidably mounted on the turntable and is arranged parallel to the support shaft. A retaining ring is fixedly mounted on the limiting pin. The same return spring, which is movably sleeved on the outside of the limiting pin, is fixedly mounted on the bottom side of the turntable and the retaining ring. Multiple limiting holes are opened in a circumferential array on the top of the filter box based on the support shaft as the center. The bottom end of the limiting pin is inserted into the corresponding limiting hole.

[0010] Preferably, a pull ring for pulling the limiting pin to move axially is fixedly installed on the top side of the turntable.

[0011] Preferably, the outer side of the kiln body cylinder located inside the kiln head shell and the corner of the inner wall of the kiln head shell are both chamfered.

[0012] Preferably, a plurality of airflow nozzles are fixedly installed on the side of the hollow ring near the sealing bearing, and the airflow nozzles are all arranged in the direction of the axis of the kiln body along the side of the sealing bearing near the hollow ring.

[0013] Preferably, the inner ring of the sealed bearing and the outer circumference of the kiln body are fixedly installed with the same guide ring, and the top side of the guide ring is inclined.

[0014] Preferably, the plurality of airflow nozzle one and airflow nozzle two and the hollow ring are all made of high-temperature resistant material, and the high-temperature resistant material is 310S stainless steel.

[0015] Preferably, the rotating seat has multiple mounting cavities, and multiple high-temperature dust filters are respectively sealed and snapped into the corresponding mounting cavities. The bottom of the multiple mounting cavities has through holes, and the mounting cavities are connected to the air inlet pipe through the through holes.

[0016] The beneficial effects of this utility model are: This invention, by incorporating an exhaust fan, a hollow ring, and two airflow nozzles, forms a double-layered air curtain between the kiln body and the kiln head shell, effectively preventing the leakage of high-temperature dust-laden gas and the entry of cold outside air. Simultaneously, the rotating seat and multiple high-temperature dust filters within the filter box allow for switching between these filters without stopping equipment operation, ensuring continuous exhaust filtration. The limiting components ensure the stability of the rotating seat and high-temperature dust filters during operation, while the guide ring and chamfered structure optimize the airflow path, preventing turbulence and effectively improving the air curtain isolation effect. Furthermore, the use of high-temperature resistant materials extends the service life of key components. The overall structural design of this invention is reasonable, significantly improving the sealing performance and operating efficiency of the rotary kiln head while reducing energy loss. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of a rotary kiln head sealing structure proposed in this utility model. Figure 2 for Figure 1 A partial sectional view of the structure; Figure 3 for Figure 2 Front view structural diagram; Figure 4 This is a partial three-dimensional structural schematic diagram of the present invention; Figure 5 for Figure 4 Front view structural diagram; Figure 6 This is a schematic diagram of the filter box and air inlet pipe components proposed in this utility model; Figure 7 This is a schematic diagram of the structure of the rotating seat, high-temperature dust filter, support shaft and limiting component proposed in this utility model; Figure 8 This is a schematic diagram of the limiting component proposed in this utility model.

[0019] In the diagram: 1. Kiln body cylinder; 2. Kiln head shell; 3. Sealed bearing; 4. Hollow ring; 401. Airflow nozzle one; 402. Airflow nozzle two; 41. Connecting pipe; 42. Annular pipe; 43. Exhaust fan; 44. Filter box; 45. Rotating seat; 451. Support shaft; 452. Turntable; 453. Limit pin; 454. Retaining ring; 455. Return spring; 46. High-temperature dust filter. Detailed Implementation

[0020] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0021] Reference Figure 1-8 A rotary kiln head sealing structure includes a kiln body cylinder 1, a kiln head shell 2, a sealing bearing 3, a hollow ring 4, an exhaust fan 43, a filter box 44, a rotating seat 45, and a support shaft 451. The sealed bearing 3 is fixedly sleeved on the outside of the kiln body cylinder 1. The kiln head shell 2 is fixedly installed on the outside of the sealed bearing 3. The hollow ring 4 is fixedly installed on the inner wall of the kiln head shell 2 and located on the side where the sealed bearing 3 is connected to the kiln body cylinder 1. The exhaust fan 43 is fixedly installed on the kiln head shell 2. Multiple connecting pipes 41 connected to the hollow ring 4 are fixedly installed on the kiln head shell 2. The same annular pipe 42 is fixedly installed on the multiple connecting pipes 41. The air outlet of the exhaust fan 43 is connected to the annular pipe 42. Multiple airflow nozzles 401, connected to and inclined to the hollow ring 4, are fixedly installed on the inner circumferential surface of the hollow ring 4. The ends of the multiple airflow nozzles 401 away from the hollow ring 4 are all inclined towards the kiln head shell 2. To ensure gas filling between the sealing bearing 3 and the hollow ring 4, and to prevent excessive negative pressure from the multiple airflow nozzles 401 causing backflow of cold air and thus reducing interference with the sealing performance of the sealing bearing 3, multiple airflow nozzles 402 are fixedly installed on the side of the hollow ring 4 closest to the sealing bearing 3. The outlet direction of the multiple airflow nozzles 402 is along the direction of the sealing bearing 3. One side of the hollow ring 4 is set towards the axis of the kiln body 1. In order to guide the airflow blown out by multiple airflow nozzles 402 at the same time, it can cooperate with the airflow nozzle 401 to form an isolation air curtain on the outer peripheral side of the kiln body 1 located inside the kiln head shell 2. This can effectively prevent the high temperature dust-containing gas inside the kiln body 1 from leaking to the outside of the kiln head shell 2, while reducing the entry of cold air from the outside into the kiln body 1 through the sealing gap. This helps to maintain the stable temperature inside the kiln and improve the thermal efficiency of the rotary kiln. The inner ring of the sealing bearing 3 is fixedly installed with the same guide ring on the outer peripheral side of the kiln body 1. The top side of the guide ring is set in an inclined position. The filter box 44 is fixedly installed on the kiln head shell 2. An air inlet pipe connected to the kiln head shell 2 is fixedly installed at the bottom of the filter box 44. The air inlet of the exhaust fan 43 is connected to the filter box 44 from the top and is located on the same axis as the air outlet of the air inlet pipe. The support shaft 451 is rotatably installed on the top inner wall and bottom inner wall of the filter box 44. The rotating seat 45 is fixedly installed on the support shaft 451 and is in movable sealing contact with the inner side wall of the filter box 44. Multiple high-temperature dust filters 46 for air intake filtration are installed in the rotating seat 45. The top end of the support shaft 451 extends above the filter box 44 and is fixedly mounted on a turntable 452. A limiting pin 453, which is parallel to the support shaft 451, is slidably mounted on the turntable 452. A retaining ring 454 is fixedly mounted on the limiting pin 453. The retaining ring 454 and the bottom side of the turntable 452 are fixedly mounted with the same return spring 455, which is movably sleeved on the outside of the limiting pin 453. The top of the filter box 44 has multiple limiting holes arranged in a circumferential array based on the support shaft 451. The bottom end of the limiting pin 453 is inserted into the corresponding limiting hole, which can limit the adjusted rotating seat 45, thereby ensuring the stability of the rotating seat 45 and the high-temperature dust filter 46 during the filtration process. At the same time, in order to facilitate the operation of the limiting pin 453 by the operator, a pull ring for pulling the limiting pin 453 to move axially is fixedly mounted on the top side of the turntable 452.

[0022] In this embodiment, in order to guide the airflow blown out by multiple airflow nozzles 401 and multiple airflow nozzles 402 and avoid airflow turbulence, so as to enable it to quickly merge with the original air inside the kiln body cylinder 1, the outer side of the kiln body cylinder 1 inside the kiln head shell 2 and the corner of the inner side wall of the kiln head shell 2 are both chamfered.

[0023] In this embodiment, in order to enable the airflow nozzle 1 401, airflow nozzle 2 402 and hollow ring 4 to adapt to the high-temperature working environment and avoid deformation or damage due to high temperature, thereby extending their service life, all airflow nozzle 1 401, airflow nozzle 2 402 and hollow ring 4 are made of high-temperature resistant material, and the high-temperature resistant material is 310S stainless steel.

[0024] In this embodiment, the rotating seat 45 is provided with multiple mounting cavities, and multiple high-temperature dust filters 46 are respectively sealed and snapped into the corresponding mounting cavities. The bottom of the multiple mounting cavities is provided with through holes, and the mounting cavities are connected to the air inlet pipe through the through holes, so that when the exhaust fan 43 is working, the high-temperature air in the kiln cylinder 1 can be introduced into the corresponding mounting cavity through the air inlet pipe and the corresponding through hole, and after being filtered by the high-temperature dust filter 46, it can be transported into the annular pipe 42 by the exhaust fan 43, thereby realizing the filtration of dust in the high-temperature gas.

[0025] In the process of replacing the high-temperature dust filter 6 by rotating the support shaft 451 via the turntable 452 to achieve the rotation of the rotating seat 45, there are at least two high-temperature dust filters 6 in the filter box 4, and the size of the air inlet end of the air inlet pipe is larger than the distance between two adjacent through holes, so as to ensure uninterrupted filtration effect when replacing the high-temperature dust filter 6 by rotating the rotating seat 45.

[0026] The circuits, electronic components, and module mechanisms involved all employ existing technologies, which can be fully implemented by those skilled in the art, and need no further explanation. The content protected by this application does not involve any improvement to the software, circuits, or methods.

[0027] Working principle: When in use, first connect the power supply and start the exhaust fan 43. The exhaust fan 43 draws gas from inside the kiln head shell 2 through the air inlet pipe. After the gas enters the filter box 44 through the air inlet pipe, it passes through the high-temperature dust filter 46 corresponding to the rotating seat 45 for filtration, thereby removing the high-temperature dust particles. The filtered clean gas is delivered to the annular pipe 42 through the air outlet of the exhaust fan 43, and then enters the hollow ring 4 through multiple connecting pipes 41. Part of the gas entering the hollow ring 4 is sprayed out through multiple inclined airflow nozzles 401, with the airflow direction inclined and towards the kiln head shell 2. The other part is sprayed out through airflow nozzles 402 along the axis of the kiln body cylinder 1 between the sealing bearing 3 and the hollow ring 4. Under the guidance of the guide ring, the sprayed airflow, combined with the chamfer design at the corner of the kiln body cylinder 1 and the kiln head shell 2, forms a stable isolation air curtain on the outer periphery of the kiln body cylinder 1 located inside the kiln head shell 2, effectively blocking the leakage of high-temperature dust-containing gas and the intrusion of external cold air.

[0028] When the high-temperature dust filter 46 needs to be replaced, the operator pulls the pull ring, causing the limit pin 453 to move upward, so that its bottom end is disengaged from the current limit hole. The return spring 455 is compressed. Then, the turntable 452 is rotated, causing the support shaft 451 and the rotating seat 45 to rotate, rotating the unused high-temperature dust filter 46 to the position corresponding to the air inlet of the air inlet pipe and the air inlet of the exhaust fan 43. Then, the pull ring is released, and under the elastic force of the return spring 455, the limit pin 453 is inserted into the new limit hole, completing the limit fixation of the rotating seat 45. This allows the filter to be switched without stopping the equipment operation, ensuring the continuous stability of the filtration and isolation air curtain.

[0029] The above provides a detailed description of the kiln head sealing structure for a rotary kiln provided by this utility model. Specific embodiments have been used to illustrate the principle and implementation of this utility model. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A kiln head sealing structure for a rotary kiln, characterized in that, It includes a kiln body cylinder (1), a kiln head shell (2), a sealed bearing (3), a hollow ring (4), an exhaust fan (43), a filter box (44), a rotating seat (45), a limiting assembly, and a support shaft (451); The sealed bearing (3) is fixedly sleeved on the outside of the kiln body cylinder (1). The kiln head shell (2) is fixedly installed on the outside of the sealed bearing (3). The hollow ring (4) is fixedly installed on the inner wall of the kiln head shell (2) and located on the side where the sealed bearing (3) communicates with the kiln body cylinder (1). Multiple airflow nozzles (401) connected to the hollow ring (4) and arranged in an inclined manner are fixedly installed on the inner circumferential surface of the hollow ring (4). The ends of the multiple airflow nozzles (401) away from the hollow ring (4) are all inclined towards the kiln head shell (2). The exhaust fan (43) is fixedly installed on the kiln head shell (2). Multiple connecting pipes (41) connected to the hollow ring (4) are fixedly installed on the kiln head shell (2). The same annular pipe (42) is fixedly installed on the multiple connecting pipes (41). The exhaust port of the exhaust fan (43) is connected to the annular pipe (42). The filter box (44) is fixedly installed on the kiln head shell (2). The bottom of the filter box (44) is fixedly installed with an air inlet pipe connected to the kiln head shell (2). The air inlet of the exhaust fan (43) is connected to the filter box (44) from above and is located on the same axis as the air outlet of the air inlet pipe. The support shaft (451) is rotatably installed on the top inner wall and bottom inner wall of the filter box (44). The rotating seat (45) is fixedly installed on the support shaft (451) and is in movable sealing contact with the inner side wall of the filter box (44). Multiple high-temperature dust filters (46) for air intake filtration are installed in the rotating seat (45). The limiting component is set at the top of the support shaft (451) and connected to the top of the filter box (44).

2. The kiln head sealing structure of a rotary kiln according to claim 1, characterized in that: The limiting assembly includes a limiting pin (453), a turntable (452), a retaining ring (454), and a return spring (455). The top end of the support shaft (451) extends above the filter box (44) and is fixedly mounted on the turntable (452). The limiting pin (453) is slidably mounted on the turntable (452) and is parallel to the support shaft (451). The retaining ring (454) is fixedly mounted on the limiting pin (453). The same return spring (455) is movably sleeved on the outside of the limiting pin (453) and the bottom side of the retaining ring (454) and the turntable (452) are fixedly mounted on the bottom side. The top of the filter box (44) is provided with multiple limiting holes in a circular array based on the support shaft (451) as the center. The bottom end of the limiting pin (453) is inserted into the corresponding limiting hole.

3. The kiln head sealing structure of a rotary kiln according to claim 2, characterized in that: The top side of the turntable (452) is fixedly equipped with a pull ring for pulling the limit pin (453) to move axially.

4. The kiln head sealing structure of a rotary kiln according to claim 1, characterized in that: The kiln body cylinder (1) is located on the outer side of the kiln head shell (2) and at the corner of the inner wall of the kiln head shell (2).

5. The kiln head sealing structure of a rotary kiln according to claim 1, characterized in that: Multiple airflow nozzles (402) are fixedly installed on the side of the hollow ring (4) near the sealing bearing (3). The airflow direction of the multiple airflow nozzles (402) is set along the axis of the kiln body cylinder (1) on the side of the sealing bearing (3) near the hollow ring (4).

6. The kiln head sealing structure of a rotary kiln according to claim 5, characterized in that: The inner ring of the sealed bearing (3) and the outer circumference of the kiln body (1) are fixedly installed with the same guide ring, and the top side of the guide ring is set in an inclined shape.

7. The kiln head sealing structure of a rotary kiln according to claim 6, characterized in that: The multiple airflow nozzles 1 (401) and 2 (402) and the hollow ring (4) are all made of high-temperature resistant material, and the high-temperature resistant material is 310S stainless steel.

8. The kiln head sealing structure of a rotary kiln according to claim 1, characterized in that: The rotating seat (45) has multiple mounting cavities, and multiple high-temperature dust filters (46) are respectively sealed and snapped into the corresponding mounting cavities. The bottom of the multiple mounting cavities has through holes, and the mounting cavities are connected to the air inlet pipe through the through holes.

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