A rotary kiln with circumferential bottom air distribution

Abstract

The present invention is applicable to the technical field related to rotary kilns, and provides a rotary kiln with circumferential bottom air distribution, comprising: a support frame and a kiln body arranged on the support frame; a circumferential air distribution mechanism located at the discharging end of the kiln body, the circumferential air distribution mechanism comprising an air distribution ring fixedly connected to the kiln body, and a plurality of multi-directional air distribution components arranged in the circumferential direction of the air distribution ring, the multi-directional air distribution components comprising a second air distribution box and a first air distribution box, a first air distribution cavity and a second air distribution cavity are respectively arranged in the first air distribution box, a swing-type air distribution unit is arranged in the second air distribution box, a lifting unit and a bottom air distribution unit are respectively arranged in the first air distribution cavity and the second air distribution cavity; and a selective air supply mechanism. Through the cooperative arrangement of the circumferential air distribution mechanism and the selective air supply mechanism, the present invention can achieve uniform air supply, help reduce the temperature fluctuation in the kiln, improve the stability of product quality, and avoid the pollution of the atmosphere by organic volatile components.

Description

Technical Field

[0001] The present invention relates to the technical field related to rotary kilns, and specifically to a rotary kiln with circumferential bottom air distribution. Background Technique

[0002] A rotary kiln is a rotating calcination kiln used to process solid materials. Through high-temperature calcination, physical or chemical changes occur to the materials, and it is widely used in industries such as building materials, metallurgy, and chemical engineering. The primary air at the tail of the rotary kiln is the air used for fuel combustion, making the atmosphere inside the kiln reducing or weakly oxidizing to avoid the combustion of carbon in the raw materials. Through the air distribution design at the circumferential bottom, a more uniform supply of secondary air can be achieved, which helps to improve the calcination effect of the materials inside the kiln. This uniform air supply method helps to reduce the temperature fluctuation inside the kiln and improve the stability of product quality, which is of great significance for promoting the green and low-carbon development in the industrial field.

[0003] When the traditional rotary kiln is in use, although the main body of the rotary kiln is always rotating, a large amount of high-temperature air still accumulates at the top of the rotary kiln, resulting in the materials at the bottom being unable to come into full contact with the high-temperature air, affecting the calcination effect. Although the materials piled up at the bottom can achieve a turning effect when following the rotation of the main body of the rotary kiln, the materials piled together are still difficult to come into full contact with the air, which is not conducive to achieving a better calcination effect. Therefore, in view of the above current situation, there is an urgent need to provide a rotary kiln with circumferential bottom air distribution to overcome the deficiencies in current practical applications. Summary of the Invention

[0004] The purpose of the present invention is to provide a rotary kiln with circumferential bottom air distribution, aiming to solve the problems in the above background technique.

[0005] The present invention is implemented as follows. A rotary kiln with circumferential bottom air distribution includes:

[0006] A support frame and a kiln body arranged on the support frame;

[0007] A circumferential air distribution mechanism located at the discharge end of the kiln body. The circumferential air distribution mechanism includes a distribution ring fixedly connected to the kiln body. A plurality of multi-directional air distribution components are arranged in the circumferential direction of the distribution ring. The multi-directional air distribution components include a second air distribution box and a first air distribution box. A first air distribution chamber and a second air distribution chamber are respectively arranged in the first air distribution box, and a partition plate is arranged between the first air distribution chamber and the second air distribution chamber. The second air distribution box is fixedly connected to the first air distribution box, and a communication hole for connecting the second air distribution box and the first air distribution chamber is opened on the first air distribution box. A swing-type air distribution unit is arranged in the second air distribution box, and a lifting unit and a bottom air distribution unit are respectively arranged in the first air distribution chamber and the second air distribution chamber;

[0008] And a selective air supply mechanism for inputting air to the multi-directional air distribution components located at the top and bottom;

[0009] The swing air distribution unit includes:

[0010] The first air distribution holes opened on two sides of the air distribution box, and multiple groups of the first air distribution holes are opened;

[0011] The first rotating shaft, which is rotatably installed in the second air distribution box, and a second gear is fixedly installed on the first rotating shaft;

[0012] The wind power swing module for driving the first rotating shaft to rotate reciprocally, and the wind power swing module is arranged in the second air distribution box;

[0013] And the spoiler fixedly installed on the first rotating shaft, and air outlet holes matched with the first air distribution holes are opened on the spoiler.

[0014] As a further scheme of the present invention: the lifting unit includes:

[0015] The first air inlet pipe, one end of the first air inlet pipe is fixedly installed on the air distribution ring, the other end of the first air inlet pipe extends into the first air distribution cavity, and is slidably connected with the top of the first air distribution box;

[0016] The support plate, which is fixedly installed at one end of the first air inlet pipe away from the air distribution ring, and the two ends of the support plate are slidably matched with the partition plate;

[0017] And the spring for elastically pulling the support plate, one end of the spring is fixedly connected with the support plate, and the other end of the spring is fixedly connected with the inner top of the first air distribution box.

[0018] As a further scheme of the present invention: the wind power swing module includes:

[0019] The second rotating shaft, which is rotatably installed in the second air distribution box, and multiple groups of fan blades are fixedly installed on the second rotating shaft;

[0020] The third rotating shaft, which is rotatably installed in the second air distribution box, and a first gear and a driving plate are respectively fixedly installed on the third rotating shaft, and a third gear meshing with the first gear is fixedly installed on the second rotating shaft;

[0021] The linkage rod, which is slidably installed in the second air distribution box, and a translation frame and a rack are respectively fixedly installed at two ends of the linkage rod, and the rack meshes with the second gear;

[0022] And the driving column for driving the translation frame to reciprocate horizontally, the driving column is fixedly installed on the driving plate, and the driving column is slidably matched with the translation frame.

[0023] As a further scheme of the present invention: a flow guide plate is further arranged in the second air distribution box.

[0024] As a further solution of the present invention: the spoiler block is of a semi-circular structure, and the outer wall of the spoiler block is rotatably fitted with the inner wall of the second air distribution box, and a filter plate is further arranged inside the spoiler block.

[0025] As a further solution of the present invention: the bottom air distribution unit includes:

[0026] The second air inlet pipe fixedly installed on the air distribution ring, one end of the second air inlet pipe away from the air distribution ring extends into the second air distribution cavity, and the second air inlet pipe is slidably connected to both the top of the first air distribution box and the partition plate;

[0027] The limiting plate is fixedly installed on the second air inlet pipe, and the limiting plate is slidably fitted with the partition plate;

[0028] And the second air distribution holes, a plurality of groups of the second air distribution holes are arranged at the bottom of the first air distribution box.

[0029] As a further solution of the present invention: the second air distribution holes have the same structure as the communication holes, and the number of the communication holes is less than the number of the second air distribution holes.

[0030] As a further solution of the present invention: the selective air supply mechanism includes:

[0031] The support block fixedly installed on the support frame, an air inlet ring is fixedly installed on the support block, and an air guide cavity is provided inside the air inlet ring, and the air inlet ring is rotatably connected to the air distribution ring;

[0032] The input pipe fixedly installed on the air inlet ring, the input pipe is communicated with the air guide cavity inside the air inlet ring;

[0033] The first air guide hole for communicating with the first air inlet pipe, the first air guide hole is opened on the inner wall of the air inlet ring, and the first air guide hole is communicated with the air guide cavity inside the air inlet ring;

[0034] And the second air guide hole for communicating with the second air inlet pipe, the second air guide hole is opened on the inner wall of the air inlet ring, and the second air guide hole is communicated with the air guide cavity inside the air inlet ring.

[0035] As a further solution of the present invention: a plurality of sealing strips for separating the first air guide hole and the second air guide hole are fixedly installed on the inner wall of the air inlet ring, and a sealing groove for cooperating with the sealing strips is opened on the air distribution ring.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows: The air distribution ring rotates synchronously with the kiln body. By means of the air distribution ring, a plurality of multi-directional air distribution components are driven to rotate synchronously. During use, the externally heated air can be input into the selective air supply mechanism. During the process of the multi-directional air distribution components rotating following the air distribution ring, their positions are constantly changing. By using the selective air supply mechanism, air (i.e., heated air) can be respectively input into the multi-directional air distribution components located at the top and the bottom. After the hot air enters the multi-directional air distribution component at the bottom, it will be ejected through the bottom air distribution unit, enabling the hot air to enter the stacked materials, improving the contact effect between the materials and the hot air, and further enhancing the calcination effect. After the hot air enters the multi-directional air distribution component at the top, it will drive the lifting unit to work, causing the air distribution box one to move downward, making the air distribution box one protrude from the air distribution ring and the kiln body. By using the swinging air distribution unit, the hot air can be ejected from above the top of the kiln body in a reciprocating swinging manner, impacting the high-temperature air originally gathered at the top. During the secondary air distribution process, the hot air can be effectively dispersed in the kiln body, thereby improving the calcination effect. The uniform air supply method helps to reduce the temperature fluctuation in the kiln, improve the stability of product quality, and avoid the pollution of the atmosphere by organic volatile components; the partition plate can completely separate the first air distribution chamber and the second air distribution chamber;

[0037] Through the combined setting of the circumferential air distribution mechanism and the selective air supply mechanism in the present invention, it is avoided that in the traditional rotary kiln during use, although the rotary kiln body is always in a rotating state, a large amount of high-temperature air still accumulates at the top of the rotary kiln, resulting in the materials at the bottom being unable to fully contact the high-temperature air, affecting the calcination effect. Although the materials stacked at the bottom can achieve a turning effect when rotating with the rotary kiln body, it is still difficult for the stacked materials to fully contact the air, which is not conducive to achieving a good calcination effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic structural diagram of the present invention.

[0039] Figure 2 is a schematic structural diagram of the circumferential air distribution mechanism in the present invention.

[0040] Figure 3 is Figure 2 a cross-sectional structural diagram of

[0041] Figure 4 is Figure 3 an enlarged structural diagram of part A in

[0042] Figure 5 is a schematic structural diagram of the multi-directional air distribution component in the present invention.

[0043] Figure 6 is Figure 5 a cross-sectional structural diagram of

[0044] Figure 7 This is a schematic cross-sectional view of the first air distribution box in the present invention.

[0045] Figure 8 This is a schematic cross-sectional view of the flow disturbing block in the present invention.

[0046] Figure 9 This is a schematic view of the structure of the wind swinging module in the present invention.

[0047] Figure 10 This is a schematic view of the structure of the air inlet ring in the present invention.

[0048] In the attached drawings: 1 - kiln body, 2 - support frame, 3 - support block, 4 - air inlet ring, 5 - input pipe, 6 - first air guiding hole, 7 - air distribution ring, 8 - sealing groove, 9 - second air inlet pipe, 10 - first air inlet pipe, 11 - second air distribution box, 12 - first air distribution box, 13 - first air distribution hole, 14 - spring, 15 - support plate, 16 - limit plate, 17 - second air distribution hole, 18 - partition plate, 19 - communication hole, 20 - deflector, 21 - fan blade, 22 - first gear, 23 - first rotating shaft, 24 - flow disturbing block, 25 - air outlet hole, 26 - linkage rod, 27 - first air distribution cavity, 28 - second air distribution cavity, 29 - filter plate, 30 - second gear, 31 - second rotating shaft, 32 - third gear, 33 - third rotating shaft, 34 - driving column, 35 - translation frame, 36 - rack, 37 - sealing strip, 38 - second air guiding hole, 39 - driving plate. Detailed implementation manners

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. The following describes the specific implementation of the present invention in detail with specific embodiments.

[0050] Please refer to Figures 1 - 10 , a rotary kiln with circumferential bottom air distribution provided by an embodiment of the present invention, the rotary kiln with circumferential bottom air distribution includes:

[0051] A support frame 2 and a kiln body 1 arranged on the support frame 2;

[0052] The circumferential air distribution mechanism is located at the discharging end of the kiln body 1. The circumferential air distribution mechanism includes an air distribution ring 7 fixedly connected to the kiln body 1. A plurality of multi-directional air distribution components are arranged in the circumferential direction of the air distribution ring 7. The multi-directional air distribution component includes an air distribution box two 11 and an air distribution box one 12. An air distribution chamber one 27 and an air distribution chamber two 28 are respectively arranged in the air distribution box one 12, and a partition plate 18 is arranged between the air distribution chamber one 27 and the air distribution chamber two 28. The air distribution box two 11 is fixedly connected to the air distribution box one 12, and a communication hole 19 for connecting the air distribution box two 11 and the air distribution chamber one 27 is opened on the air distribution box one 12. A swing type air distribution unit is arranged in the air distribution box two 11. A lifting unit and a bottom air distribution unit are respectively arranged in the air distribution chamber one 27 and the air distribution chamber two 28;

[0053] And a selective air supply mechanism for supplying air to the multi-directional air distribution components located at the top and the bottom.

[0054] In an embodiment of the present invention, the kiln body 1 is rotatably arranged on the support frame 2, and a driving unit (not shown in the figure) for driving the kiln body 1 to rotate is also arranged on the support frame 2. The kiln body 1 and the driving unit, etc. are all existing publicly known technologies, thus forming a complete rotary kiln structure, which will not be elaborated here; the air distribution ring 7 can be connected to the kiln body 1 by welding. If there are special requirements, multiple groups of air distribution rings 7 can be arranged at the discharge end of the kiln body 1, and multiple groups of air distribution rings 7 can also be connected together by welding; the air distribution ring 7 rotates synchronously with the kiln body 1, and the air distribution ring 7 will drive multiple groups of multi-directional air distribution components to rotate synchronously. When in use, the externally heated air can be input into the selective air supply mechanism. During the process of the multi-directional air distribution components rotating with the air distribution ring 7, their positions are constantly changing. The selective air supply mechanism can respectively input air (i.e., heated air) to the multi-directional air distribution components located at the top and bottom. After the hot air enters the multi-directional air distribution components at the bottom, it will be ejected through the bottom air distribution unit, so that the hot air can enter the piled materials, improving the contact effect between the materials and the hot air, and further improving the calcination effect. After the hot air enters the multi-directional air distribution components at the top, it will drive the lifting unit to work, so that the air distribution box one 12 can move downward, making the air distribution box one 12 protrude from the air distribution ring 7 and the kiln body 1. The swinging air distribution unit can eject the hot air from above the top of the kiln body 1 in a reciprocating swing manner, impacting the high-temperature air originally gathered at the top. During the secondary air distribution process, the hot air can be effectively dispersed in the kiln body 1, further improving the calcination effect. The uniform air supply method helps to reduce the temperature fluctuation in the kiln, improve the stability of the product quality, and avoid the pollution of the atmosphere by organic volatile components; the partition plate 18 can completely separate the first air distribution cavity 27 and the second air distribution cavity 28; compared with the prior art, through the combined setting of the circumferential air distribution mechanism and the selective air supply mechanism, the present invention avoids the problem that in the traditional rotary kiln during use, although the rotary kiln body is always in a rotating state, a large amount of high-temperature air still accumulates at the top of the rotary kiln, resulting in the materials at the bottom being unable to fully contact the high-temperature air, affecting the calcination effect. Although the piled materials at the bottom can achieve a turning effect when rotating with the rotary kiln body, it is still difficult for the piled materials to fully contact the air, which is not conducive to achieving a good calcination effect.

[0055] In an embodiment of the present invention, please refer to Figures 1 - 10 , the lifting unit includes:

[0056] The first air inlet pipe 10, one end of the first air inlet pipe 10 is fixedly installed on the air distribution ring 7, and the other end of the first air inlet pipe 10 extends into the first air distribution cavity 27 and is slidably connected to the top of the air distribution box one 12;

[0057] The support plate 15 is fixedly installed at one end of the first air inlet pipe 10 away from the air distribution ring 7, and both ends of the support plate 15 are slidably matched with the partition plate 18;

[0058] And a spring 14 for elastically pulling the support plate 15. One end of the spring 14 is fixedly connected to the support plate 15, and the other end of the spring 14 is fixedly connected to the inner top of the first air distribution box 12;

[0059] The swing air distribution unit includes:

[0060] The first air distribution holes 13 are opened on the side of the second air distribution box 11, and multiple groups of the first air distribution holes 13 are opened;

[0061] The first rotating shaft 23 is rotatably installed in the second air distribution box 11, and a second gear 30 is fixedly installed on the first rotating shaft 23;

[0062] A wind force swing module for driving the first rotating shaft 23 to rotate reciprocally is arranged in the second air distribution box 11;

[0063] And a spoiler 24 fixedly installed on the first rotating shaft 23. Air outlet holes 25 which are matched with the first air distribution holes 13 are opened on the spoiler 24;

[0064] The wind force swing module includes:

[0065] The second rotating shaft 31 is rotatably installed in the second air distribution box 11, and multiple groups of fan blades 21 are fixedly installed on the second rotating shaft 31;

[0066] The third rotating shaft 33 is rotatably installed in the second air distribution box 11, and a first gear 22 and a driving plate 39 are respectively fixedly installed on the third rotating shaft 33. A third gear 32 which is meshed with the first gear 22 is fixedly installed on the second rotating shaft 31;

[0067] The linkage rod 26 is slidably installed in the second air distribution box 11, and a translation frame 35 and a rack 36 are respectively fixedly installed at both ends of the linkage rod 26. The rack 36 is meshed with the second gear 30;

[0068] And a driving column 34 for driving the translation frame 35 to reciprocate horizontally. The driving column 34 is fixedly installed on the driving plate 39, and the driving column 34 is slidably matched with the translation frame 35;

[0069] A flow guide plate 20 is further arranged in the second air distribution box 11; the flow guide plate 20 is used to guide the air introduced through the communication hole 19 to the fan blades 21, so as to blow the fan blades 21 to move, and the fan blades 21 drive the second rotating shaft 31 to rotate

[0070] The spoiler block 24 is of a semi-circular structure, and the outer wall of the spoiler block 24 is rotatably fitted with the inner wall of the second air distribution box 11. A filter plate 29 is further arranged inside the spoiler block 24.

[0071] In this embodiment, after the hot air enters the first air distribution cavity 27 through the first air inlet pipe 10, the hot air preferentially fills the first air distribution cavity 27. After filling the first air distribution cavity 27, it will push the first air distribution box 12 downward (the inflation speed can be increased by increasing the intake air pressure). After the hot air continuously enters the first air distribution cavity 27, part of the hot air will enter the second air distribution box 11 through the communication hole 19. Under the guiding action of the guiding plate 20, the hot air blows directly towards the fan blade 21, causing the fan blade 21 to drive the second rotating shaft 31 to rotate. At the same time, the hot air entering the second air distribution box 11 will be discharged through the air outlet hole 25 and the first air distribution hole 13. The second rotating shaft 31 can drive the first gear 22 to rotate by driving the third gear 32 to rotate. By using the first gear 22, the third rotating shaft 33 and the driving plate 39 can be driven to rotate. The driving plate 39 can drive the driving column 34 to rotate around the third rotating shaft 33, and thus can drive the translation frame 35 to drive the linkage rod 26 to reciprocate. By using the linkage rod 26, the rack 36 can be driven to reciprocate, thereby driving the second gear 30 to rotate reciprocally, and further driving the first rotating shaft 23 to rotate reciprocally. By using the first rotating shaft 23 to drive the spoiler block 24 to swing reciprocally, the air outlet hole 25 can communicate with different first air distribution holes 13, so that the flow direction of the discharged high-temperature gas changes continuously, which is convenient for dispersing the high-temperature gas gathered at the top of the kiln body 1. While making the air distribution uniform, the high-temperature gas in the kiln body 1 is evenly dispersed. The filter plate 29 can further prevent materials and other sundries from entering the second air distribution box 11.

[0072] In an embodiment of the present invention, please refer to Figures 1 - 10 , the bottom air distribution unit includes:

[0073] The second air inlet pipe 9 fixedly installed on the air distribution ring 7, and the end of the second air inlet pipe 9 away from the air distribution ring 7 extends into the second air distribution cavity 28, and the second air inlet pipe 9 is slidably connected to the top of the first air distribution box 12 and the partition plate 18;

[0074] The limiting plate 16, which is fixedly installed on the second air inlet pipe 9 and is slidably fitted with the partition plate 18;

[0075] And the second air distribution holes 17, and multiple groups of the second air distribution holes 17 are opened at the bottom of the first air distribution box 12;

[0076] The second air distribution hole 17 has the same structure as the communication hole 19, and the number of the communication holes 19 is less than that of the second air distribution holes 17; wherein the structures, sizes and air output amounts of the second air distribution holes 17 and the communication holes 19 are the same, and the number of the communication holes 19 is much less than that of the second air distribution holes 17, so that the air entering the second air distribution cavity 28 can be quickly discharged through the second air distribution holes 17, while the air entering the first air distribution cavity 27 is discharged more slowly through the communication holes 19, thereby enabling the lifting assembly to drive the first air distribution box 12 to move downward. Protective nets can be arranged outside the second air distribution holes 17 and the first air distribution holes 13 to prevent the materials in the kiln body 1 from entering the first air distribution box 12 and the second air distribution box 11.

[0077] In this embodiment, after the hot air enters the second air distribution cavity 28 through the second air inlet pipe 9, it will be evenly discharged through multiple groups of the second air distribution holes 17, so that the hot air can enter the piled materials, improving the contact effect between the materials and the hot air, and further improving the calcination effect. The setting of the limiting plate 16 can improve the stability when the first air distribution box 12 moves downward, and at the same time can assist in controlling the downward movement distance, improving the stability of the overall structure.

[0078] In an embodiment of the present invention, please refer to Figures 1 - 10 , the selective air supply mechanism includes:

[0079] A support block 3 fixedly installed on the support frame 2, a wind inlet ring 4 is fixedly installed on the support block 3, and an air guide cavity is provided in the wind inlet ring 4, and the wind inlet ring 4 is rotatably connected with the air distribution ring 7;

[0080] An input pipe 5 fixedly installed on the wind inlet ring 4, and the input pipe 5 is communicated with the air guide cavity in the wind inlet ring 4;

[0081] A first air guide hole 6 for communicating with the first air inlet pipe 10, the first air guide hole 6 is opened on the inner wall of the wind inlet ring 4, and the first air guide hole 6 is communicated with the air guide cavity in the wind inlet ring 4;

[0082] And a second air guide hole 38 for communicating with the second air inlet pipe 9, the second air guide hole 38 is opened on the inner wall of the wind inlet ring 4, and the second air guide hole 38 is communicated with the air guide cavity in the wind inlet ring 4;

[0083] Multiple groups of sealing strips 37 for separating the first air guide hole 6 and the second air guide hole 38 are fixedly installed on the inner wall of the wind inlet ring 4, and a sealing groove 8 for cooperating with the sealing strips 37 is opened on the air distribution ring 7.

[0084] In this embodiment, during use, an external heating device is utilized to heat the air, and the heating temperature can be controlled according to actual production. The external heating device can adopt existing public technologies. The external heating device can be directly connected to the input pipe 5 to facilitate the introduction of the heated air into the air inlet ring 4. Both the first air guiding hole 6 and the second air guiding hole 38 are of strip-shaped structures. The first air guiding hole 6 is arranged in the upper part of the air inlet ring 4, and the second air guiding hole 38 is arranged in the lower part of the air inlet ring 4, so as to facilitate the introduction of hot air into the first air inlet pipe 10 and the second air inlet pipe 9 respectively. Through the cooperative setting of the sealing strip 37 and the sealing groove 8, a sealing effect can be achieved, reducing the leakage of hot air.

[0085] In the present invention, unless otherwise clearly defined and limited, terms such as "sliding", "rotating", "fixing", "provided with", etc. shall be understood in a broad sense. For example, it can be a welded connection, a bolt connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0086] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A rotary kiln with circumferential bottom air distribution, comprising a support frame and a kiln body arranged on the support frame, characterized in that: Also includes: A circumferential air distribution mechanism located at the discharge end of the kiln body, the circumferential air distribution mechanism includes an air distribution ring fixedly connected to the kiln body, a plurality of groups of multi-directional air distribution components are arranged in the circumferential direction of the air distribution ring, the multi-directional air distribution components include air distribution box 2 and air distribution box 1, air distribution cavity 1 and air distribution cavity 2 are respectively arranged in the air distribution box 1, and a partition plate is arranged between the air distribution cavity 1 and the air distribution cavity 2, the air distribution box 2 is fixedly connected to the air distribution box 1, and a connecting hole for connecting the air distribution box 2 with the air distribution cavity 1 is opened on the air distribution box 1, a swinging air distribution unit is arranged in the air distribution box 2, and a lifting unit and a bottom air distribution unit are respectively arranged in the air distribution cavity 1 and the air distribution cavity 2; and a selective air supply mechanism for inputting air to the multi-directional air distribution components located at the top and bottom; The swing type air distribution unit comprises: An air distribution hole 1 is provided on the side of the air distribution box 2, and the air distribution hole 1 is provided with multiple groups; A rotating shaft 1, wherein the rotating shaft 1 is rotatably mounted in the air distribution box 2, and a gear 2 is fixedly mounted on the rotating shaft 1; A wind-powered swing module for driving the first rotating shaft to rotate back and forth, wherein the wind-powered swing module is disposed in the second wind distribution box; And a spoiler block fixedly mounted on the first rotating shaft, wherein the spoiler block is provided with an air outlet hole used in conjunction with the first air distribution hole.

2. The rotary kiln with circumferential bottom air distribution according to claim 1, characterized in that: The lifting unit comprises: An air inlet pipe 1, one end of which is fixedly mounted on the air distribution ring, and the other end of which extends into the air distribution cavity 1 and is slidably connected to the top of the air distribution box 1; A support plate, wherein the support plate is fixedly mounted on one end of the air inlet pipe away from the air distribution ring, and both ends of the support plate are slidably matched with the partition plate; And a spring for elastically pulling the support plate, one end of the spring is fixedly connected to the support plate, and the other end of the spring is fixedly connected to the inner top of the air distribution box.

3. The rotary kiln with circumferential bottom air distribution according to claim 1, characterized in that: The wind swing module comprises: A second rotating shaft, wherein the second rotating shaft is rotatably mounted in the second air distribution box, and a plurality of sets of fan blades are fixedly mounted on the second rotating shaft; Rotating shaft three, the rotating shaft three is rotatably mounted in the air distribution box two, and the rotating shaft three is respectively fixedly mounted with a gear one and a driving plate, and the rotating shaft two is fixedly mounted with a gear three meshing with the gear one; A linkage rod, wherein the linkage rod is slidably mounted in the second air distribution box, and a translation frame and a rack are fixedly mounted on both ends of the linkage rod, and the rack is meshed with the second gear; And a driving column for driving the translation frame to reciprocate in the horizontal direction, wherein the driving column is fixedly mounted on the driving plate, and the driving column and the translation frame are slidably matched.

4. The rotary kiln with circumferential bottom air distribution according to claim 3, characterized in that: A guide plate is also arranged in the second air distribution box.

5. The rotary kiln with circumferential bottom air distribution according to claim 1, characterized in that: The spoiler block is a semicircular structure, the outer wall of the spoiler block is rotationally matched with the inner wall of the second air distribution box, and a filter plate is also arranged in the spoiler block.

6. The rotary kiln with circumferential bottom air distribution according to claim 2, characterized in that: The bottom air distribution unit comprises: The second air inlet pipe is fixedly mounted on the air distribution ring, wherein one end of the second air inlet pipe away from the air distribution ring extends into the second air distribution cavity, and the second air inlet pipe is slidably connected to the top of the first air distribution box and the partition plate; A limit plate, the limit plate is fixedly mounted on the second air inlet pipe, and the limit plate is slidably matched with the partition plate; And the second air distribution hole, the second air distribution hole is provided with a plurality of groups at the bottom of the first air distribution box.

7. The rotary kiln with circumferential bottom air distribution according to claim 6, characterized in that: The second air distribution hole has the same structure as the connecting hole, and the number of the connecting holes is less than the number of the second air distribution hole.

8. The rotary kiln with circumferential bottom air distribution according to claim 6, characterized in that: The selective air supply mechanism comprises: A support block fixedly mounted on the support frame, an air inlet ring fixedly mounted on the support block, an air guide cavity being provided in the air inlet ring, and the air inlet ring is rotatably connected to the air distribution ring; An input pipe fixedly mounted on the air inlet ring, the input pipe being in communication with the air guide cavity in the air inlet ring; An air guide hole 1 for communicating with an air inlet pipe 1, wherein the air guide hole 1 is provided on the inner wall of the air inlet ring, and the air guide hole 1 is communicated with an air guide cavity in the air inlet ring; And a second air guide hole for communicating with the second air inlet pipe, wherein the second air guide hole is arranged on the inner wall of the air inlet ring, and the second air guide hole is communicated with the air guide cavity in the air inlet ring.

9. The rotary kiln with circumferential bottom air distribution according to claim 8, characterized in that: A plurality of sealing strips for separating the first air guide hole and the second air guide hole are fixedly mounted on the inner wall of the air inlet ring, and a sealing groove for cooperating with the sealing strip is provided on the air distribution ring.

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