A rotary kiln air supply device

Abstract

This invention discloses a rotary kiln air supply device, including an air supply system, a jetting system, and a sealing device for connecting and sealing the air supply system and the jetting system on the rotary kiln. The sealing device includes an air duct sealing ring, an annular air duct, a limiting component, a sealing component, and a connecting component. The air duct sealing ring is connected to the outer circumference of the rotary kiln via the connecting component. The annular air duct is arranged around the outer circumference of the air duct sealing ring and forms an airflow channel with the air duct sealing ring. The air supply system supplies air to the jetting system through the airflow channel, and the jetting system supplies air to the rotary kiln. The sealing component is located at the connection between the annular air duct and the air duct sealing ring to seal the airflow channel. The limiting component is located on both sides of the annular air duct to limit the displacement of the air duct sealing ring. The rotary kiln air supply device disclosed in this invention achieves the purpose of supplying air from a static air supply system to a dynamic rotary kiln through the sealing device, solving the problem of air supply to the kiln body under combined static and dynamic conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rotary kiln roasting, in particular, to a rotary kiln air supply device. BACKGROUND

[0002] In the existing industrial production, rotary kiln is widely used in metallurgy, chemical industry, environmental protection and other industries. In order to improve production efficiency, the rotary kiln needs to be provided with a spraying system on the cylinder to adjust the reaction field and / or temperature field in the cylinder. When the spraying system is arranged on the rotary kiln, the air supply system in a fixed state needs to be connected to the spraying system on the cylinder. However, the spraying system rotates with the cylinder, so it is necessary to solve the problem of air supply for the rotary kiln body.

[0003] As shown in Figure 1 In the prior art, the kiln body fan 1 is generally fixed on the rotary kiln 2, the kiln body fan 1 rotates with the rotary kiln, and the kiln body fan 1 directly supplies air to the spraying system 3 through a pipeline. The kiln body fan 1 is powered through a power supply slip ring 4.

[0004] However, the rotary kiln has axial thermal expansion and contraction and radial deformation, especially in the hot state, which greatly affects the reliability of the slip ring and the service life of the fan. These problems in the prior art often cause the system to fail to operate normally, thereby affecting production.

[0005] Therefore, it is necessary to provide a rotary kiln air supply device to alleviate the above-mentioned defects. SUMMARY

[0006] The present application provides a rotary kiln air supply device, which solves the technical problem of air supply during the rotation of the rotary kiln.

[0007] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0008] A rotary kiln air supply device, comprising an air supply system, a spraying system, and a sealing device for connecting and sealing the air supply system and the spraying system on the rotary kiln, the sealing device comprising an air duct sealing ring, an annular air duct, a limiting assembly, a sealing assembly and a connecting assembly, the air duct sealing ring being connected to the outer periphery of the rotary kiln through the connecting assembly, the annular air duct being arranged around the outer periphery of the air duct sealing ring and forming an air flow passage with the air duct sealing ring, the air supply system supplying an air volume to the spraying system through the air flow passage, the spraying system being connected to the rotary kiln to supply an air volume to the rotary kiln, the sealing assembly being arranged at the connection between the annular air duct and the air duct sealing ring for sealing the air flow passage, and the limiting assembly being arranged on both sides of the annular air duct for limiting the displacement of the air duct sealing ring.

[0009] Furthermore, the air supply system includes an air supply fan, an air supply duct, and a compensation device connected in sequence. The air supply fan is used to supply air to the airflow channel. The air supply duct is connected to the annular air duct through the compensation device. One end of the jet blowing system is connected to the air duct sealing ring through the air supply duct, and the other end is inserted into the rotary kiln to deliver the air volume of the air supply system to the rotary kiln.

[0010] Furthermore, the sealing assembly includes an annular sealing ring, a compression spring, a sliding pressure ring, and a fixing frame. The fixing frame is fixedly connected to the air duct sealing ring, and an installation space is formed between the fixing frame and the annular air duct. The annular sealing ring, the compression spring, and the sliding pressure ring are installed in the installation space. One end of the compression spring is connected to the fixing frame, and the other end acts on the sliding pressure ring. The annular sealing ring is located in the annular cavity formed between the annular air duct, the air duct sealing ring, and the sliding pressure ring. The sliding pressure ring generates a compression force on the annular sealing ring through the compression spring.

[0011] Furthermore, the sealing assembly consists of two sets, which are simultaneously disposed on both sides of the sidewall of the annular air duct.

[0012] Furthermore, the cross-section of the annular sealing ring is circular or square.

[0013] Furthermore, the annular sealing ring is a rubber sealing ring or an asbestos packing sealing ring.

[0014] Furthermore, the limiting assembly includes a support frame fixed on the duct sealing ring, and an axial limiting mechanism and a radial limiting mechanism fixedly connected to the support frame. The axial limiting mechanism and the radial limiting mechanism respectively limit the displacement of the annular duct in the axial and radial directions.

[0015] Furthermore, the limiting component also includes a radial limiting track fixedly connected to the side of the annular air duct, with one end of the radial limiting mechanism away from the support frame embedded in the radial limiting track, and the radial limiting mechanism moving along the radial limiting track.

[0016] Furthermore, both the axial limiting mechanism and the radial limiting mechanism are positioning wheel sets composed of multiple positioning wheels.

[0017] Furthermore, the annular air duct is a flow channel, which is a ring structure formed by three surfaces.

[0018] The present invention has the following beneficial effects:

[0019] The rotary kiln air supply device provided by this invention achieves the purpose of supplying air from the static air supply system to the dynamic rotary kiln through a sealing device. After the airflow enters the airflow channel formed by the air duct sealing ring and the annular air duct from the air supply system, it is then sent to the jetting system via a pipeline. The jetting system then delivers the air to the rotary kiln. When the rotary kiln rotates, the air duct sealing ring, together with the limiting component and the sealing component fixed thereon, rotates with the rotary kiln under the pull of the connecting component. The annular air duct remains fixed under the action of the air supply system's pipe connection, and under the action of the limiting component, it maintains its relative position with the air duct sealing ring. This can compensate for the positional changes caused by the axial movement or deformation of the rotary kiln due to thermal expansion and contraction, and reduce the relative displacement between components. Therefore, by setting the air duct sealing ring, the annular air duct, the limiting component, the sealing component, and the connecting component, the problem of air supply to the rotary kiln body under dynamic and static combination is solved, the sealing effect of the connection of each combined component is improved, and the problems of unstable operation caused by the existing method of using a rotating cylinder with a fan for power supply are changed.

[0020] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of a rotary kiln in the prior art;

[0023] Figure 2 This is a schematic diagram of the structure of the rotary kiln air supply device provided by the present invention;

[0024] Figure 3 for Figure 2 A cross-sectional view of a portion of the structure of the rotary kiln air supply device shown.

[0025] Figure 4 for Figure 2 The cross-sectional view of the rotary kiln air supply device is shown.

[0026] Figure 5 for Figure 3 A partial structural diagram of one embodiment of the rotary kiln air supply device is shown.

[0027] Figure 6 for Figure 3 A partial structural schematic diagram of another embodiment of the rotary kiln air supply device shown. Detailed Implementation

[0028] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0031] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0032] Please refer to the following: Figure 2-4The rotary kiln air supply device includes an air supply system 30, a jetting system 31, and a sealing device 300 for connecting and sealing the air supply system 30 and the jetting system 31 on the rotary kiln 10. The sealing device 300 includes an air duct sealing ring 33, an annular air duct 35, a limiting component 37, a sealing component 38, and a connecting component 39. The air duct sealing ring 33 is connected to the outer periphery of the rotary kiln 10 through the connecting component 39. The annular air duct 35 is connected to the outer periphery of the air duct sealing ring 33 and forms an airflow channel 40 with the air duct sealing ring 33. The air supply system 30 supplies air to the jetting system 31 through the airflow channel 40. The jetting system 31 is connected to the rotary kiln 10 to deliver air to the rotary kiln 10. The sealing component 38 is disposed at the connection between the annular air duct 35 and the air duct sealing ring 33 to seal the airflow channel 40. The limiting component 37 is disposed on both sides of the annular air duct 35 to limit the displacement of the air duct sealing ring 33. After the airflow enters the airflow channel 40 formed by the air supply system 30 and the air duct sealing ring 33 and the annular air duct 35, it is then sent to the jetting system 31 through a pipeline. The jetting system 31 then delivers the airflow to the rotary kiln 10. The sealing device 300 is used to achieve the purpose of supplying air from the static air supply system to the dynamic rotary kiln 10. When the rotary kiln 10 rotates, the air duct sealing ring 33, together with the limiting component 37 and the sealing component 38 fixed thereon, rotates with the rotary kiln 10 under the pull of the connecting component 39. The annular air duct 35 is fixed by the pipe connection of the air supply system 30, and maintains its relative position with the air duct sealing ring 33 under the action of the limiting component 37. This can compensate for the positional changes caused by the axial movement or deformation of the rotary kiln 10 due to thermal expansion and contraction, and reduce the relative displacement between components. Therefore, by setting the air duct sealing ring 33, the annular air duct 35, the limiting component 37, the sealing component 38, and the connecting component 39, the problem of air supply to the kiln body of the rotary kiln 10 under dynamic and static combination is solved, the sealing effect of the connection of each combined component is improved, and the problems of the existing use of a rotating cylinder with a fan for rotating power supply and unstable operation are changed.

[0033] Specifically, in this embodiment, the rotary kiln 10 can also be a cooling cylinder or a drying cylinder, etc. The rotary kiln performs calcination during rotation, and the blowing system 31 is used to deliver airflow into the rotary kiln to regulate the reaction field and / or temperature field inside the cylinder.

[0034] The annular air duct 35 is a flow channel, which is a ring structure formed by three surfaces. Specifically, in this embodiment, the cross-section of the flow channel is square. In other embodiments, the flow channel can also be semi-circular, triangular, or other irregular shapes.

[0035] The annular air duct 35 is fixed, and the air duct sealing ring 33 is arranged around the outside of the rotating cylinder. Together with the limiting component 37 and the sealing component 38 fixed thereon, it rotates with the rotary kiln 10 under the pull of the connecting component 39. The sealing component 38 achieves the purpose of sealing the dynamic and static joint surfaces, and the sealing effect is good.

[0036] Please see Figure 5 The sealing assembly 38 includes a sealing ring 381, a compression spring 383, a sliding pressure ring 385, and a fixing frame 387. The fixing frame 387 is fixedly connected to the air duct sealing ring 33, and an installation space is formed between the fixing frame 387 and the annular air duct 35. The sealing ring 381, the compression spring 383, and the sliding pressure ring 385 are installed in the installation space. One end of the compression spring 383 is connected to the fixing frame 387, and the other end acts on the sliding pressure ring 385. The sealing ring 381 is located in the annular cavity formed between the annular air duct 35, the air duct sealing ring 33, and the sliding pressure ring 385. The sliding pressure ring 385 generates a compression force on the sealing ring 381 through the compression spring 383.

[0037] Specifically, in this embodiment, there are two sets of sealing components 38, and the two sets of sealing components 38 are simultaneously disposed on both sides of the sidewall of the annular air duct 35.

[0038] like Figure 5 As shown, specifically in this embodiment, the sealing ring 381 is an annular sealing ring with a circular cross-section. Figure 6 As shown, in another embodiment, the annular sealing ring 381 has a square cross-section, and the sealing ring 381 is a rubber sealing ring or an asbestos packing sealing ring 381. Both the rubber sealing ring and the asbestos packing sealing ring have a certain degree of elasticity, and under the compression of the pre-tightening force of the compression spring 383, they seal the connection gap between the annular air duct 35 and the air duct sealing ring 33, resulting in a good sealing effect.

[0039] Specifically, in this embodiment, the sliding pressure ring 385 is L-shaped and its bottom is fixed on the air duct sealing ring 33.

[0040] It should be noted that, as Figure 5 and Figure 6 As shown, the compression spring 383 is connected to the fixed frame 387 by a pin, which is used to better connect the compression spring 383 to the fixed frame.

[0041] like Figure 3As shown, the limiting component 37 includes a support frame 371 fixed to the air duct sealing ring 33, and an axial limiting mechanism 373 and a radial limiting mechanism 375 fixedly connected to the support frame 371. The axial limiting mechanism 373 and the radial limiting mechanism 375 respectively limit the displacement of the air duct sealing ring 33 axially and radially. The air duct sealing ring 33, the axial limiting mechanism, and the radial limiting mechanism form a U-shape surrounding and connecting to the periphery of the annular air duct 35. Since the rotary kiln 10 will undergo thermal expansion and contraction in hot and cold states, resulting in axial movement, and will also undergo radial deformation due to gravity and heat load, the axial limiting mechanism 373 and the radial limiting mechanism 375 can effectively compensate for the axial and radial displacement of the rotary kiln 10, making the movement gap between the components smaller. This makes it easier for the sealing component to seal the gap, resulting in a better sealing effect.

[0042] In another embodiment, such as Figure 3 As shown, the limiting component 37 also includes a radial limiting track 377 fixedly connected to the side of the annular air duct 35. The end of the radial limiting mechanism 375 away from the support frame 371 is embedded in the radial limiting track 377. Through the radial limiting track 377, the radial limiting mechanism 375 moves along the radial limiting track 377 under the drive of the air duct sealing ring 33. The components do not produce relative positional displacement in the radial movement, thus improving the movement accuracy.

[0043] like Figure 3 and Figure 4 As shown, both the axial limiting mechanism 373 and the radial limiting mechanism 375 are positioning wheel groups composed of multiple positioning wheels. The annular air duct 35 is kept fixed by the pipe connection of the air supply system 30, and simultaneously, under the combined action of the axial wheel group and the radial wheel group, the air duct sealing ring 33 maintains a relative positional relationship with the annular air duct 35. The axial positioning wheel group and the radial positioning wheel group have the same structure, and each group consists of 1-24 positioning wheels; preferably, each group consists of 2-24 positioning wheels. In this embodiment, the axial and radial positioning wheel groups are 12 groups evenly distributed along the circumference of the rotary kiln 10.

[0044] Specifically, the support frame 371 is shaped like a "7". The axial positioning wheel assembly is arranged along the axial direction of the rotary kiln 10, and the rollers of the axial positioning wheel assembly act on the side of the annular air duct 35. The radial positioning wheel assembly is arranged radially along the rotary kiln 10. The radial limiting track 377 is a cantilever beam structure fixed to the side of the annular air duct 35, and the other side is fixedly connected to the annular air duct 35 by reinforcing ribs. The radial positioning wheel assembly rolls along the radial limiting track 377.

[0045] The connecting component 39 is used to connect the duct sealing ring and the rotating cylinder and is rotatable and telescopic. Specifically, in this embodiment, the connecting component is hinged to the duct sealing ring and the rotating cylinder, which can accommodate certain rotational deformation. The connecting component 39 is a flexible connecting rod or a spring rod. The connecting component 39 itself has a certain degree of extensibility and can accommodate certain telescopic deformation. Preferably, the connecting component 39 is a spring rod. It can be understood that by connecting the duct sealing ring and the rotating cylinder through the connecting component 39, while achieving the purpose of connecting the two, the connecting component 39 can also adapt to and meet the angle changes and interval changes of the duct sealing ring and the rotating cylinder during movement through rotational deformation and telescopic deformation, thus connecting the duct sealing ring and the rotating cylinder more flexibly.

[0046] like Figure 3 As shown, the air supply system 30 includes an air supply fan 301, an air supply duct 303, and a compensation device 305. The air supply fan 301 supplies air to the airflow channel 40, and the air supply duct 303 is connected to the annular air duct 35 through the compensation device 305. The air supply duct 303 supplies air to the airflow channel 40. One end of the jet blowing system 31 is connected to the air duct sealing ring 33 through the cylindrical air duct 311, which connects to the airflow channel 40, and the other end is inserted into the rotary kiln 10. The airflow channel 40 connects both the air supply duct 303 and the cylindrical air duct 311 to deliver the air volume of the air supply system 30 to the rotary kiln 10.

[0047] Specifically, in this embodiment, the compensation device 305 is a rubber hose, a metal hose, or a compensator, which adapts to the radial or axial relative displacement between the pipeline and the annular air duct 35.

[0048] Specifically, when the rotary kiln rotates, the air duct sealing ring 33, together with the support frame 371 fixed thereon, the axial positioning wheel group, the radial positioning wheel group, and the sealing assembly, rotates with the rotary kiln 10 under the pull of the connecting assembly 39. Meanwhile, the annular air duct 35 remains fixed under the action of the air supply pipe 303 of the air supply system 30, and under the combined action of the axial and radial positioning wheel groups, the displacement of the annular air duct 35 is ensured, so that the annular air duct 35 maintains its relative position to the air duct sealing ring 33.

[0049] It should be noted that the cylindrical duct 311 is also equipped with a duct compensation device 313, which is used to compensate for the axial and radial displacement of the cylindrical duct 311 during movement and to prevent the duct from detaching during movement. The duct compensation device 313 is a rubber hose, a metal hose, or a compensator.

[0050] The rotary kiln air supply device provided in this embodiment of the invention achieves the purpose of supplying air from the static air supply system to the dynamic rotary kiln 10 through the sealing device 300, ensuring reliable air supply. Airflow enters the airflow channel 40 formed by the air duct sealing ring 33 and the annular air duct 35 from the air supply system 30, and then is sent to the jetting system 31 via a pipeline. The jetting system 31 then delivers the airflow into the rotary kiln 10. When the rotary kiln 10 rotates, the air duct sealing ring 33, together with the limiting component 37 and the sealing component 38 fixed thereon, rotates with the rotary kiln 10 under the pull of the connecting component 39. The annular air duct 35 is fixed by the pipe connection of the air supply system 30, and maintains its relative position with the air duct sealing ring 33 under the action of the limiting component 37. This can compensate for the positional changes caused by the axial movement or deformation of the rotary kiln 10 due to thermal expansion and contraction, and reduce the relative displacement between components. Therefore, by setting the air duct sealing ring 33, the annular air duct 35, the limiting component 37, the sealing component 38, and the connecting component 39, the problem of air supply to the kiln body of the rotary kiln 10 under dynamic and static combination is solved, the sealing effect of the connection of each combined component is improved, and the problems of the existing use of a rotating cylinder with a fan for rotating power supply and unstable operation are changed.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rotary kiln air supply device, characterized by, The application relates to a sealing device for connecting and sealing a wind supply system and a spray blowing system on a rotary kiln, which comprises a wind channel sealing ring, an annular wind channel, a limiting component, a sealing component and a connecting component, the wind channel sealing ring is connected to the outer periphery of the rotary kiln through the connecting component, the annular wind channel is arranged around the outer periphery of the wind channel sealing ring and forms an air flow channel with the wind channel sealing ring, the wind supply system supplies air to the spray blowing system through the air flow channel, the spray blowing system is connected to the rotary kiln to supply air to the rotary kiln, the sealing component is arranged at the connection between the annular wind channel and the wind channel sealing ring to seal the air flow channel, and the limiting component is arranged on both sides of the annular wind channel to limit the displacement of the wind channel sealing ring. When the rotary kiln rotates, the wind channel sealing ring, the limiting component fixed thereon and the sealing component rotate together with the rotary kiln under the pulling of the connecting component, and the annular wind channel remains fixed under the action of the pipeline connection of the wind supply system.

2. A rotary kiln air supply arrangement according to claim 1, characterised in that, The wind supply system comprises a wind supply fan, a wind supply pipeline and a compensation device which are connected in sequence, the wind supply fan is used for supplying wind to the air flow channel, the wind supply pipeline is connected to the annular wind channel through the compensation device, one end of the spray blowing system is connected to the wind channel sealing ring through a wind supply pipe, and the other end is inserted into the rotary kiln to deliver the air volume of the wind supply system into the rotary kiln.

3. The rotary kiln air supply apparatus of claim 1, wherein, The sealing component comprises an annular sealing ring, a compression spring, a sliding pressure ring and a fixing frame, the fixing frame is fixedly connected to the wind channel sealing ring, an installation space is formed between the fixing frame and the annular wind channel, the annular sealing ring, the compression spring and the sliding pressure ring are installed in the installation space, one end of the compression spring is connected to the fixing frame, and the other end acts on the sliding pressure ring, the annular sealing ring is located in an annular cavity formed among the annular wind channel, the wind channel sealing ring and the sliding pressure ring, and the sliding pressure ring generates a compression force on the annular sealing ring through the compression spring.

4. The rotary kiln air supply apparatus of claim 1, wherein, The sealing component is two groups, and the two groups of sealing components are arranged on both sides of the side wall of the annular wind channel.

5. A rotary kiln air supply arrangement according to claim 3, wherein, The cross section of the annular sealing ring is circular or square.

6. The rotary kiln air supply apparatus of claim 3, wherein The annular sealing ring is a rubber sealing ring or an asbestos packing sealing ring.

7. The rotary kiln air supply apparatus of claim 1, wherein, The limiting component comprises a support frame fixed on the wind channel sealing ring, and an axial limiting mechanism and a radial limiting mechanism fixedly connected to the support frame, the axial limiting mechanism and the radial limiting mechanism limit the displacement of the annular wind channel from the axial direction and the radial direction respectively.

8. A rotary kiln air supply arrangement according to claim 7, characterised in that, The limiting component further comprises a radial limiting track fixedly connected to the side surface of the annular wind channel, and one end of the radial limiting mechanism away from the support frame is embedded in the radial limiting track, and the radial limiting mechanism moves along the radial limiting track.

9. The rotary kiln air supply apparatus of claim 7, wherein, The axial limiting mechanism and the radial limiting mechanism are both positioning wheel groups composed of multiple positioning wheels.

10. The rotary kiln air supply apparatus of claim 1, wherein, The annular wind channel is a flow channel and has a ring structure formed by three surfaces.

Images