Rotary kiln capable of distributing air from bottom in circumferential direction

Abstract

The invention is suitable for the related technical field of rotary kilns, and provides a circumferential bottom air distribution rotary kiln which comprises a supporting frame and a kiln body arranged on the supporting frame. The circumferential air distribution mechanism is located at the discharging end of the kiln body and comprises an air distribution ring fixedly connected with the kiln body, a plurality of multi-directional air distribution assemblies are arranged in the circumferential direction of the air distribution ring, each multi-directional air distribution assembly comprises a second air distribution box and a first air distribution box, and a first air distribution cavity and a second air distribution cavity are formed in each 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 arranged in the first air distribution cavity and the second air distribution cavity correspondingly. According to the invention, through the cooperative arrangement of the circumferential air distribution mechanism and the selective air supply mechanism, uniform air supply can be realized, the reduction of temperature fluctuation in the kiln is facilitated, the stability of product quality is improved, and organic volatile components are prevented from polluting the atmosphere.

Description

Technical Field

[0001] The invention relates to the technical field related to rotary kilns, in particular to a rotary kiln with circumferential bottom air distribution. Background Art

[0002] A rotary kiln is a rotating calcining kiln used to process solid materials. It causes physical or chemical changes in the materials through high-temperature calcination. It is widely used in building materials, metallurgy, chemical industry and other industries. The primary air at the tail of the rotary kiln is the air used for fuel combustion, which makes the kiln present a reducing or weakly oxidizing atmosphere to avoid the combustion of carbon in the raw materials. The circumferential bottom air distribution design can achieve a more uniform secondary air supply, which helps to improve the calcination effect of the materials in the kiln. This uniform air supply method helps to reduce temperature fluctuations in the kiln and improve the stability of product quality. It is of great significance to promote green and low-carbon development in the industrial field.

[0003] When a traditional rotary kiln is in use, although the main body of the rotary kiln is always in a rotating state, a large amount of high-temperature air will still gather at the top of the rotary kiln, resulting in the material at the bottom being unable to fully contact with the high-temperature air, affecting the calcination effect. Although the material accumulated at the bottom can achieve a turning effect when the main body of the rotary kiln rotates, the accumulated materials are still difficult to fully contact with the air, which is not conducive to achieving a good calcination effect. Therefore, in view of the above situation, it is urgent to provide a rotary kiln with circumferential bottom air distribution to overcome the shortcomings in current practical applications. Summary of the invention

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

[0005] The present invention is achieved by a rotary kiln with circumferential bottom air distribution, comprising: A supporting frame and a kiln body arranged on the supporting frame; 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.

[0006] As a further solution of the present invention: 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.

[0007] As a further solution of the present invention: the wind swing module includes: 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.

[0008] As a further solution of the present invention: a guide plate is also arranged in the second air distribution box.

[0009] As a further solution of the present invention: 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.

[0010] As a further solution of the present invention: 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.

[0011] As a further solution of the present invention: 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.

[0012] As a further solution of the present invention: 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.

[0013] As a further solution of the present invention: a plurality of sealing strips for separating air guide hole 1 and air guide hole 2 are fixedly installed 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.

[0014] Compared with the prior art, the present invention has the following beneficial effects: the air distribution ring rotates synchronously with the kiln body, and the air distribution ring is used to 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. The position of the multi-directional air distribution component is constantly changing during the rotation of the air distribution ring. The selective air supply mechanism can input air (i.e. heated air) to the multi-directional air distribution components located at the top and bottom respectively. After the hot air enters the multi-directional air distribution component at the bottom, it will be ejected through the bottom air distribution unit, so that the hot air can enter the accumulated materials, thereby improving the contact effect between the materials and the hot air, thereby improving the High calcination effect. After the hot air enters the multi-directional air distribution component at the top, it will drive the lifting unit to work, so that the air distribution box 1 can move downward, so that the air distribution box 1 protrudes from the air distribution ring and the kiln body. The swing-type air distribution unit can eject the hot air from the top of the kiln body in a reciprocating swinging manner, impacting the high-temperature air originally gathered at the top. In the process of secondary air distribution, 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 organic volatiles from polluting the atmosphere; the partition plate can be used to completely separate the air distribution chamber 1 and the air distribution chamber 2; The present invention adopts the coordinated arrangement of the circumferential air distribution mechanism and the selective air supply mechanism to avoid the problem that in the traditional rotary kiln, although the rotary kiln body is always in a rotating state, a large amount of high-temperature air will still gather at the top of the rotary kiln, resulting in the material at the bottom being unable to fully contact with the high-temperature air, affecting the calcining effect; although the material accumulated at the bottom can achieve a turning effect when the rotary kiln body rotates, the accumulated materials are still difficult to fully contact with the air, which is not conducive to achieving a better calcining effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention.

[0016] Figure 2 It is a schematic structural diagram of the circumferential air distribution mechanism in the present invention.

[0017] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure.

[0018] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

[0019] Figure 5 It is a schematic diagram of the structure of the multi-directional air distribution component in the present invention.

[0020] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure.

[0021] Figure 7 It is a schematic cross-sectional view of the structure of the air box 1 in the present invention.

[0022] Figure 8 It is a schematic diagram of the cross-sectional structure of the spoiler block in the present invention.

[0023] Fig. 9 It is a structural schematic diagram of the wind swing module in the present invention.

[0024] Fig.10 It is a structural schematic diagram of the air inlet ring in the present invention.

[0025] In the attached figure: 1-kiln body, 2-support frame, 3-support block, 4-air inlet ring, 5-input pipe, 6-air guide hole 1, 7-air distribution ring, 8-sealing groove, 9-air inlet pipe 2, 10-air inlet pipe 1, 11-air distribution box 2, 12-air distribution box 1, 13-air distribution hole 1, 14-spring, 15-support plate, 16-limiting plate, 17-air distribution hole 2, 18-partition plate, 19-connecting hole, 20- Guide plate, 21-blade, 22-gear one, 23-rotating shaft one, 24-spoiler, 25-air outlet, 26-linkage rod, 27-air distribution chamber one, 28-air distribution chamber two, 29-filter plate, 30-gear two, 31-rotating shaft two, 32-gear three, 33-rotating shaft three, 34-driving column, 35-translation frame, 36-rack, 37-sealing strip, 38-air guide hole two, 39-driving plate. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The specific implementation of the present invention is described in detail below in combination with specific embodiments.

[0027] See also Figure 1-Figure 10 , an embodiment of the present invention provides a rotary kiln with circumferential bottom air distribution, the rotary kiln with circumferential bottom air distribution comprising: A supporting frame 2 and a kiln body 1 arranged on the supporting frame 2; A circumferential air distribution mechanism located at the discharge 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 groups of multi-directional air distribution components are arranged in the circumferential direction of the air distribution ring 7, the multi-directional air distribution components include an air distribution box 11 and an air distribution box 12, an air distribution cavity 27 and an air distribution cavity 28 are respectively arranged in the air distribution box 12, and a partition plate 18 is arranged between the air distribution cavity 17 and the air distribution cavity 28, the air distribution box 11 is fixedly connected to the air distribution box 12, and a connecting hole 19 for connecting the air distribution box 11 and the air distribution cavity 17 is opened on the air distribution box 12, a swinging air distribution unit is arranged in the air distribution box 11, and a lifting unit and a bottom air distribution unit are respectively arranged in the air distribution cavity 17 and the air distribution cavity 28; And a selective air supply mechanism for inputting air to the multi-directional air distribution components located at the top and the bottom.

[0028] In the embodiment of the present invention, the kiln body 1 is rotatably arranged on the support frame 2, and the support frame 2 is also provided with a driving unit (not shown in the figure) for driving the kiln body 1 to rotate, wherein the kiln body 1 and the driving unit are all existing public technologies, thereby forming a complete rotary kiln structure, which will not be described in detail here; the air distribution ring 7 can be connected to the kiln body 1 by welding, and 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 the 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 is used to rotate synchronously with the kiln body 1. 7 will drive multiple groups of multi-directional air distribution components to rotate synchronously. When in use, the external heated air can be input into the selective air supply mechanism. The position of the multi-directional air distribution component is constantly changing as it follows the rotation of the air distribution ring 7. The selective air supply mechanism can be used to input air (i.e. heated air) to the multi-directional air distribution components at the top and bottom respectively. After the hot air enters the multi-directional air distribution component at the bottom, it will be ejected through the bottom air distribution unit, so that the hot air can enter the accumulated materials, thereby improving the contact effect between the materials and the hot air, thereby improving the calcining effect. The hot air enters the top After the multi-directional air distribution component of the kiln is inserted into the kiln, the lifting unit will be driven to work, so that the air distribution box 12 can move downward, so that the air distribution box 12 protrudes from the air distribution ring 7 and the kiln body 1. The swing-type air distribution unit can eject hot air from the top of the kiln body 1 in a reciprocating swinging manner, impacting the high-temperature air originally gathered at the top. In the process of secondary air distribution, the hot air can be effectively dispersed in the kiln body 1, thereby improving the calcination effect. The uniform air supply method helps to reduce temperature fluctuations in the kiln, improve the stability of product quality, and avoid organic volatiles from polluting the atmosphere; the partition plate 18 can be used to The invention can completely separate the air distribution chamber 1 27 from the air distribution chamber 2 28; compared with the prior art, the invention avoids the problem that when the traditional rotary kiln is in use, although the rotary kiln body is always in a rotating state, the high-temperature air will still gather in large quantities at the top of the rotary kiln, resulting in the material at the bottom being unable to fully contact with the high-temperature air, affecting the calcining effect; although the material accumulated at the bottom can achieve a turning effect when the rotary kiln body rotates, the accumulated materials are still difficult to fully contact with the air, which is not conducive to achieving a better calcining effect.

[0029] In one embodiment of the present invention, see Figure 1-Figure 10 , the lifting unit comprises: An air inlet pipe 10, one end of which is fixedly mounted on the air distribution ring 7, and the other end of which extends into the air distribution cavity 27 and is slidably connected to the top of the air distribution box 12; A support plate 15, wherein the support plate 15 is fixedly mounted on one end of the 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; and a spring 14 for elastically pulling the support plate 15, one end of the spring 14 being fixedly connected to the support plate 15, and the other end of the spring 14 being fixedly connected to the inner top of the air distribution box 12; The swing type air distribution unit comprises: An air distribution hole 13 is provided on the side of the air distribution box 11, and the air distribution hole 13 is provided in multiple groups; A rotating shaft 23, the rotating shaft 23 is rotatably mounted in the air distribution box 11, and a gear 2 30 is fixedly mounted on the rotating shaft 23; A wind swing module for driving the rotating shaft 1 23 to reciprocate, the wind swing module being arranged in the wind distribution box 2 11; and a spoiler block 24 fixedly mounted on the rotating shaft 1 23, wherein the spoiler block 24 is provided with an air outlet hole 25 used in conjunction with the air distribution hole 13; The wind swing module comprises: The second rotating shaft 31 is rotatably mounted in the second air distribution box 11, and a plurality of fan blades 21 are fixedly mounted on the second rotating shaft 31; Rotating shaft three 33, the rotating shaft three 33 is rotatably mounted in the air distribution box two 11, and the rotating shaft three 33 is respectively fixedly mounted with a gear one 22 and a driving plate 39, and the rotating shaft two 31 is fixedly mounted with a gear three 32 meshing with the gear one 22; A linkage rod 26, wherein the linkage rod 26 is slidably mounted in the second air distribution box 11, and a translation frame 35 and a rack 36 are fixedly mounted on both ends of the linkage rod 26, and the rack 36 is meshed with the second gear 30; and a driving column 34 for driving the translation frame 35 to reciprocate in the horizontal direction, wherein the driving column 34 is fixedly mounted on the driving plate 39, and the driving column 34 and the translation frame 35 are slidably matched; The wind box 11 is further provided with a guide plate 20; the guide plate 20 is used to guide the wind introduced into the connecting hole 19 to the fan blade 21, thereby blowing the fan blade 21 to move, and the fan blade 21 is used to drive the rotating shaft 31 to rotate. The spoiler block 24 is a semicircular structure, the outer wall of the spoiler block 24 is rotatably matched with the inner wall of the second air distribution box 11 , and a filter plate 29 is also arranged inside the spoiler block 24 .

[0030] In the present embodiment, after the hot air enters the air distribution chamber 27 through the air inlet pipe 10, the hot air first fills the air distribution chamber 27. After filling the air distribution chamber 27, the air distribution box 12 will be pushed downward (the inflation speed can be accelerated by increasing the air intake pressure). After the hot air continues to enter the air distribution chamber 27, part of the hot air will enter the air distribution box 11 through the connecting hole 19. Under the guidance of the guide plate 20, the hot air blows directly to the fan blades 21, so that the fan blades 21 drive the rotating shaft 2 31 to rotate. At the same time, the hot air entering the air distribution box 11 will be discharged through the air outlet 25 and the air distribution hole 13. The rotating shaft 2 31 can drive the gear 22 to rotate by driving the gear 3 32 to rotate. The gear 22 can drive the gear 22 to rotate. The movable shaft three 33 and the driving plate 39 rotate. The driving plate 39 drives the driving column 34 to rotate with the shaft three 33 as the axis, and can use the translation frame 35 to drive the linkage rod 26 to move back and forth. The linkage rod 26 can drive the rack 36 to move back and forth, thereby driving the gear two 30 to rotate back and forth, and then drive the shaft one 23 to rotate back and forth. The shaft one 23 drives the spoiler block 24 to swing back and forth, so that the air outlet 25 can be connected with different air distribution holes one 13, so that the flow direction of the discharged high-temperature gas is constantly changing, which is convenient for dispersing the high-temperature gas gathered on the top of the kiln body 1, making the air distribution uniform, and realizing the uniform dispersion of the high-temperature gas in the kiln body 1. The filter plate 29 can further prevent materials and other debris from entering the air distribution box two 11.

[0031] In one embodiment of the present invention, see Figure 1-Figure 10 , the bottom air distribution unit comprises: An air inlet pipe 2 9 is fixedly mounted on the air distribution ring 7, wherein one end of the air inlet pipe 2 9 away from the air distribution ring 7 extends into the air distribution cavity 28, and the air inlet pipe 2 9 is slidably connected to the top of the air distribution box 12 and the partition plate 18; The limiting plate 16 is fixedly mounted on the air inlet pipe 9, and the limiting plate 16 is slidably matched with the partition plate 18; and a second air distribution hole 17, wherein the second air distribution hole 17 is provided in a plurality of groups at the bottom of the first air distribution box 12; The second air distribution hole 17 has the same structure as the connecting hole 19, and the number of the connecting holes 19 is less than the number of the second air distribution holes 17; the second air distribution hole 17 has the same structure, size and air output as the connecting hole 19, and the number of the connecting holes 19 is much smaller than the number of the second air distribution holes 17, so that the wind entering the second air distribution chamber 28 can be quickly discharged through the second air distribution hole 17, while the wind entering the first air distribution chamber 27 is discharged more slowly through the connecting hole 19, thereby enabling the lifting assembly to drive the first air distribution box 12 to move downward, and the outer sides of the second air distribution hole 17 and the first air distribution hole 13 can be provided with a protective net to prevent the material in the kiln body 1 from entering the first air distribution box 12 and the second air distribution box 11.

[0032] In this embodiment, after the hot air enters the air distribution chamber 28 through the air inlet pipe 29, it will be evenly discharged through the multiple groups of air distribution holes 17, so that the hot air can enter the accumulated materials, improve the contact effect between the materials and the hot air, and then improve the calcination effect. The setting of the limit plate 16 can improve the stability of the air distribution box 12 when it moves downward, and at the same time can assist in controlling the downward movement distance, thereby improving the stability of the overall structure.

[0033] In one embodiment of the present invention, see Figure 1-Figure 10 , the selective air supply mechanism comprises: A support block 3 fixedly mounted on the support frame 2, an air inlet ring 4 fixedly mounted on the support block 3, and an air guide cavity is provided in the air inlet ring 4, and the air inlet ring 4 is rotatably connected to the air distribution ring 7; An inlet pipe 5 fixedly mounted on the air inlet ring 4, wherein the inlet pipe 5 is connected to the air guide cavity in the air inlet ring 4; An air guide hole 6 for communicating with an air inlet pipe 10, wherein the air guide hole 6 is provided on the inner wall of the air inlet ring 4, and the air guide hole 6 is communicated with the air guide cavity in the air inlet ring 4; and a second air guide hole 38 for communicating with the second air inlet pipe 9, wherein the second air guide hole 38 is provided on the inner wall of the air inlet ring 4, and the second air guide hole 38 is communicated with the air guide cavity in the air inlet ring 4; A plurality 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 air inlet ring 4 , and a sealing groove 8 for cooperating with the sealing strips 37 is provided on the air distribution ring 7 .

[0034] In this embodiment, when in use, the air is heated by an external heating device, and the heating temperature can be controlled according to actual production, wherein the external heating device can adopt existing public technology, and the external heating device can be directly connected to the input pipe 5, so as to facilitate the introduction of the heated air into the air inlet ring 4, wherein the air guide hole 1 6 and the air guide hole 2 38 are both long strip structures, and the air guide hole 1 6 is arranged at the upper part of the air inlet ring 4, and the air guide hole 2 38 is arranged at the lower part of the air inlet ring 4, so as to facilitate the introduction of hot air into the air inlet pipe 1 10 and the air inlet pipe 2 9 respectively, and the cooperation of the sealing strip 37 and the sealing groove 8 can achieve a sealing effect and reduce the leakage of hot air.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "slide", "rotate", "fix", "have" and the like should be understood in a broad sense, for example, it can be a welding connection, a bolt connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in 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 installed 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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