A rotary dryer

Abstract

The present invention relates to the technical field of dryers, specifically a rotary dryer, comprising a linearly distributed rotary drying zone and a rotary cooling zone, a material transfer zone being provided between the rotary drying zone and the rotary cooling zone, the material transfer zone comprising a turntable, a plurality of transfer channels penetrating the turntable, a spiral conveying structure and a discharge structure. The present invention delivers the material from the rotary drying zone to the rotary cooling zone through the cooperation of the spiral conveying structure and the transfer channel, the material forms a dense airflow barrier layer in the transfer channel, and on the basis of ensuring continuous processing of the material, the dynamic material actively and naturally effectively blocks the air convection between the drying zone and the cooling zone, without relying on a fixed baffle or a pressure gradient to control the airflow mode; at the same time, an airflow barrier is also formed at the transfer channel port by dynamic accumulation, and the double-blocking airflow exchange mechanism is utilized to fully enhance the effect of the airflow barrier, and the spiral conveying can effectively avoid abnormal accumulation and retention of materials, thereby improving the stability of the continuous production process.

Description

Technical Field

[0001] The present invention relates to the technical field of dryers, in particular to a rotary dryer. Background Art

[0002] A rotary dryer is a device that continuously dries materials through a rotating cylinder. Some models integrate a cooling zone to achieve continuous drying and cooling production. However, existing rotary dryers with integrated drying and cooling functions usually face the problem of heat energy loss caused by convection between high temperature in the drying zone and low temperature in the cooling zone, resulting in a double decrease in drying and cooling efficiency.

[0003] In response to the above-mentioned problems, the existing technology generally adopts fixed baffles to physically separate the drying zone and the cooling zone, but the baffles need to reserve gaps for the material channels, which is actually unable to effectively isolate convection. Moreover, the material is fed only by the rotation of the drying cylinder, and in the process of the material passing through the channel gap from the drying zone to the cooling zone, it is easy for the material to accumulate and be retained abnormally, thereby reducing the stability of continuous production. Secondly, some technologies also use a pressure gradient to control the airflow, but this method will cause a significant increase in energy consumption and high production costs. In addition, the control of the pressure gradient itself is relatively complex and has poor stability, which is easily affected by fluctuations in working conditions and reduces the stability of continuous production. Summary of the Invention

[0004] The present invention provides a rotary dryer, comprising a linearly distributed rotary drying zone and a rotary cooling zone, wherein a material transfer zone is provided between the rotary drying zone and the rotary cooling zone, and wherein the material transfer zone comprises: a rotary disk, which is sealed and provided between the rotary drying zone and the rotary cooling zone; a plurality of transfer channels penetrating the rotary disk, wherein the transfer channels are distributed along the circumference of the rotary disk and connect the rotary drying zone and the rotary cooling zone; a spiral conveying structure, which is provided in the transfer channel and is used to actively push the material from the rotary drying zone to the rotary cooling zone, and wherein the material forms a dense airflow barrier layer in the transfer channel; during the rotation of the rotary disk, the dense airflow in the transfer channel is The barrier layer always exists, and the material dropping point is constantly changing and falling in a dispersed manner; the discharge structure is arranged at the port of the transfer channel close to the rotating cooling zone; the discharge structure includes a high-level main outlet located above the transfer channel and a low-level auxiliary outlet located below it, and the flow cross-sectional area of ​​the low-level auxiliary outlet is smaller than that of the high-level main outlet; the pushing volume of the spiral conveying structure per unit time is greater than the flow volume of the low-level auxiliary outlet and less than the flow volume of the high-level main outlet. The material first flows out from the low-level auxiliary outlet, accumulates to cover the port of the transfer channel, and then enters the rotating cooling zone from the high-level main outlet. The dynamic accumulation of material at the port of the transfer channel also forms an airflow barrier.

[0005] In one possible implementation, the discharging structure also includes a blocking disk, which is inclined from top to bottom toward the transmission channel and is rotatably mounted on the turntable. A counterweight area is provided on the side of the blocking disk away from the transmission channel. During the rotation of the turntable, the blocking disk automatically rotates under the action of the counterweight area while maintaining an unchanged inclination angle. Side baffles are symmetrically provided on the blocking disk. The area between the part of the blocking disk below the side baffle and the turntable constitutes a low-level auxiliary outlet, and the area between the upper part and the turntable constitutes a high-level main outlet.

[0006] In one possible implementation, an isolation material guiding structure is provided on the side of the turntable close to the rotating cooling zone. The isolation material guiding structure includes a connector provided with an outer guide surface. The connector is fixedly mounted on the right end of the turntable. The outer guide surface is provided with a plurality of circumferentially arranged concave material guiding areas, and the concave material guiding areas correspond one-to-one to the discharge structure.

[0007] In one possible implementation, the connector is an annular structure and is provided with an inner flow resistance surface therein. The inner flow resistance surface is a conical structure and the direction of the cone top is opposite to that of the outer guide surface. Due to the opening of the concave material guide area, the outer wall of the outer guide surface forms a circumferentially extending wavy structure.

[0008] In a possible implementation, when no material enters the end of the transfer channel close to the rotary drying zone as the turntable rotates, the spiral conveying structure stops pushing.

[0009] In one possible implementation, one end of the spiral conveying structure is connected to a drive shaft, which rotates through the outside of the turntable and is connected to a drive source. The drive source includes a gear and an incomplete gear ring. The gear corresponds to the drive shaft one by one and is coaxially fixedly connected. The incomplete gear ring is fixedly set. As the turntable rotates, when the gear passes through the tooth area of ​​the incomplete gear ring, the spiral conveying structure is driven to rotate due to engagement.

[0010] In one possible implementation, a concave collection area is provided on the side of the turntable close to the rotary drying area. The collection area is an annular structure, and a plurality of radial baffles distributed circumferentially are provided in the collection area. The radial baffles correspond one-to-one to the transfer channels, and the radial baffles are used to prolong the time that the material stays at the entrance of the transfer channel during the rotation of the turntable.

[0011] The technical solution of the present invention has at least one of the following technical effects: 1. The present invention uses a spiral conveying structure and a transfer channel to transport the material from the rotary drying zone to the rotary cooling zone. The material forms a dense airflow barrier layer in the transfer channel. On the basis of ensuring continuous processing of the material, the dynamic material actively and naturally blocks the air convection between the drying zone and the cooling zone, thereby improving the efficiency and effect of drying and cooling, reducing energy waste, and naturally forming a barrier without relying on fixed baffles or pressure gradients to control the airflow.

[0012] 2. The present invention also combines the discharge method of the high-position main outlet and the low-position auxiliary outlet, that is, the material first flows out from the low-position auxiliary outlet, and then overflows from the high-position main outlet after accumulation, thereby increasing the conveying pressure of the spiral conveying structure, increasing the density of the material in the transmission channel, and forming an airflow barrier at the port of the transmission channel through dynamic accumulation. The double-blocking airflow exchange mechanism is used to fully improve the effect of airflow blocking, and the spiral conveying can effectively avoid abnormal accumulation and retention of materials, thereby improving the stability of the continuous production process.

[0013] 3. The low-position auxiliary outlet of the present invention can ensure that the material fully enters the rotary cooling zone from the rotary drying zone, effectively avoiding the material from being retained inside the equipment, further improving the stability of continuous production and discontinuous production. In addition, the transfer channels evenly distributed along the circumference of the turntable rotate with the turntable, so that the drop point of the transfer channel changes continuously, further improving the efficiency and effect of cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure is a schematic diagram of the overall structure of a rotary dryer provided by an embodiment of the present invention.

[0015] Figure 2 It is a schematic cross-sectional structural diagram of a rotary dryer provided by an embodiment of the present invention.

[0016] Figure 3 The present invention provides a structural schematic diagram of a baffle plate, an outer guide surface and an inner flow resistance surface of a rotary dryer.

[0017] Figure 4 It is a structural schematic diagram of a transmission channel and a spiral conveying structure of a rotary dryer provided by an embodiment of the present invention.

[0018] Figure 5 It is a structural schematic diagram of a material collection area and radial material baffle of a rotary dryer provided by an embodiment of the present invention.

[0019] Figure 6 The figure is a schematic structural diagram of a side baffle of a rotary dryer provided by an embodiment of the present invention.

[0020] Figure 7 The figure is a schematic diagram of the distribution state of radial baffles of a rotary dryer provided by an embodiment of the present invention.

[0021] In the figure: 1. turntable; 2. transmission channel; 3. spiral conveying structure; 4. discharge structure; 41. high-position main outlet; 42. low-position auxiliary outlet; 43. blocking disk; 44. side baffle; 5. isolation guide structure; 51. outer guide surface; 52. connector; 53. concave guide area; 54. inner flow resistance surface; 6. drive shaft; 7. drive source; 71. gear; 72. incomplete gear ring; 8. collection area; 9. radial baffle; 10. rotating cylinder 1; 11. rotating cylinder 2; 12. connecting seat; 13. outlet 1; 14. outlet 2; 15. guide pipe; 16. mounting seat; 17. annular flow channel; 18. outlet pipe. DETAILED DESCRIPTION

[0022] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described below, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] See also Figure 1 、 Figure 2 and Figure 4 , a rotary dryer comprises a rotating cylinder 10 located on the left and a rotating cylinder 2 11 located on the right, with a turntable 1 sealed between the two, thereby forming a continuous drying and cooling integrated system, wherein the turntable 1 serves as a dynamic sealing interface and has the triple functions of material transfer, airflow isolation, and material dispersion; the turntable 1 is fixedly sealed and connected to the rotating cylinder 10, and is rotationally sealed and connected to the rotating cylinder 2 11, and the rotation direction of the rotating cylinder 2 11 is opposite to that of the rotating cylinder 10; the rotating cylinder 10, the rotating cylinder 2 11 and the turntable 1 are installed as a whole in an inclined manner, and the rotating cylinder 10 and the rotating cylinder 2 11 are both internally provided with a copying plate (copying plate is a prior art and is not shown in the figure) so that the material is actively transported from left to right and finally output from the right port of the rotating cylinder 2 11; the rotating cylinder 10 rotates to form a rotary drying zone, and the rotating cylinder 2 11 rotates to form a rotary cooling zone; such as Figure 2As shown, the material enters the rotating cylinder 10 from the left port and moves rightward toward the turntable 1 as the rotating cylinder 10 rotates until it gathers on the left side of the turntable 1. In this process, as the rotating cylinder 10 rotates, the material will be repeatedly picked up and scattered by the shoveling plate in the rotating cylinder 10, thereby enhancing the heat exchange speed and improving the drying efficiency. The turntable 1 is evenly provided with a number of transfer channels 2 that pass through the turntable 1 on the left and right along the circumference. A spiral conveying structure 3 is provided in the transfer channel 2. When the material gathers on the left side of the turntable 1, the spiral conveying structure 3 in the transfer channel 2 passes through the material gathering area in sequence as the turntable 1 rotates. When passing through the material gathering area, the rotation of the spiral conveying structure 3 itself will push the material from the rotary drying area on the left to the rotary cooling area on the right (pushing the material in the rotating cylinder 10 As the material is pushed into rotating drum 11, it forms a dense airflow barrier within transfer channel 2, actively and effectively blocking air convection between the rotary drying zone and the rotary cooling zone. This continuously conveys the material, effectively improving the efficiency and effectiveness of drying and cooling, while also preventing abnormal accumulation and retention of material, and enhancing the stability of the continuous production process. Furthermore, as the turntable 1 rotates, the point at which the material enters the rotary cooling zone (i.e., within rotating drum 11) continuously changes, allowing the material to be fully dispersed, further improving the efficiency and effectiveness of material cooling. From the moment the transfer channel 2 passes through the material accumulation zone and re-enters the material accumulation zone as the turntable 1 rotates, the spiral conveying structure 3 remains in a non-rotating feeding state, ensuring that material is always accumulated within the transfer channel 2, forming an airflow barrier. As the material is pushed into rotating drum 11 by the spiral conveying structure 3, it is transported rightward as the inclined rotating drum 11 rotates, and is repeatedly scooped up and dropped by the scrapers within rotating drum 11, enhancing the cooling effect and improving cooling efficiency.

[0024] See Figure 2 、 Figure 3 、 Figure 4 and Figure 6, a discharge structure 4 is provided at the right end of each transfer channel 2, and the discharge structure 4 includes a high-level main outlet 41 located above the transfer channel 2 and a low-level auxiliary outlet 42 located below the transfer channel 2. The flow cross-sectional area of ​​the low-level auxiliary outlet 42 is smaller than the high-level main outlet 41. The material enters the rotary cooling zone from the high-level main outlet 41 and the low-level auxiliary outlet 42, and the pushing volume of the spiral conveying structure 3 per unit time is greater than the flow volume of the low-level auxiliary outlet 42 and less than the flow volume of the high-level main outlet 41. After the material comes out of the right port of the transfer channel 2, it will first flow out from the low-level auxiliary outlet 42. Because the pushing volume of the spiral conveying structure 3 per unit time is greater than the outflow volume of the low-level auxiliary outlet 42, the material will dynamically accumulate in the transfer channel 2 until it is completed. After fully covering the right port of the transfer channel 2, the material overflows from the high-position main outlet 41. On the one hand, this discharging method will reversely increase the conveying pressure of the spiral conveying structure 3 to a certain extent, improve the density of the material in the transfer channel 2, and correspondingly increase its airflow barrier effect, further improving the efficiency and effect of drying and cooling; on the other hand, the material also forms an airflow barrier at the right port of the transfer channel 2, which is conducive to further improving the efficiency and effect of drying and cooling and the stability of the continuous drying and cooling process of the material, and the low-position auxiliary outlet 42 can ensure that the material fully enters the rotary cooling zone from the rotary drying zone, effectively avoiding the material from being retained inside the equipment, causing material waste or affecting the quality of the next batch of material processing.

[0025] See Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , a blocking plate 43 is provided at the right end of the transmission channel 2, the blocking plate 43 is inclined from top to bottom toward the transmission channel 2 and is rotatably mounted on the turntable 1 through the connecting seat 12, and a counterweight area is provided on the right side of the blocking plate 43, such as Figure 6 As shown, the thickness of the lower half of the blocking plate 43 is greater than that of the upper half. The lower half of the blocking plate 43 is the counterweight area. The counterweight area and the blocking plate 43 are an integrated structure. Depending on the conditions of different materials, an additional gravity block fixedly installed on the blocking plate 43 can be configured to ensure that the blocking plate 43 can adaptively rotate under the action of gravity. During the rotation of the turntable 1, the blocking plate 43 always maintains an unchanged inclination angle (i.e., maintains a vertical state) under the action of the counterweight area, and the high-position main outlet 41 is always located directly above the low-position auxiliary outlet 42, and the high-position main outlet 41 is always located above the transfer channel 2, and the low-position auxiliary outlet 42 is always located below the transfer channel 2; a side baffle 44 is fixedly connected to the blocking plate 43, and the upper end surface of the side baffle 44 is located above the corresponding transfer channel 2 (as shown in FIG. Figure 4 As shown in FIG), the side baffles 44 are symmetrically distributed on both sides of the transfer channel 2, and divide the area between the blocking plate 43 and the turntable 1 into two parts, the part below the side baffles 44 is the low-level auxiliary outlet 42 (as shown in FIG). Figure 4As shown in the figure, the part above the side baffle 44 is the high-position main outlet 41. After the material comes out from the right port of the transfer channel 2, it will first flow out from the low-position auxiliary outlet 42 under the action of gravity and centrifugal force. When the material piles up to the upper end surface of the side baffle 44, it will flow out from the high-position main outlet 41; in the process of discharging, as the turntable 1 rotates, the blocking plate 43 automatically rotates in the opposite direction under the action of the counterweight area. On the one hand, the relative positions of the high-position main outlet 41 and the low-position auxiliary outlet 42 are kept unchanged, thereby ensuring the stability of the discharging process. On the other hand, the rotation of the blocking plate 43 can effectively prevent the low-position auxiliary outlet 42 and the high-position main outlet 41 from being blocked, thereby further ensuring the stability of the discharging process.

[0026] See Figure 2 、 Figure 3 、 Figure 4 and Figure 5 During the process of rotating the drum 10 to dry the material, the material in the drum 10 will accumulate in the bottom area on the left side of the turntable 1. When the transfer channel 2 moves from the bottom area on the left side of the turntable 1 to the top area of ​​the turntable 1 as the turntable 1 rotates, no material enters its left port. At this time, the spiral conveying structure 3 stops pushing the material, so that the material stays in the transfer channel 2. There is no need to add other structures to block the airflow between the rotary drying zone and the rotary cooling zone through the transfer channel 2 to form convection. Figure 4 As shown, the left end of the spiral conveying structure 3 is connected to the drive shaft 6, and the left end of the drive shaft 6 rotates and passes through the outside of the turntable 1 and is connected to the drive source 7. The drive source 7 includes a gear 71 and an incomplete gear ring 72. The incomplete gear ring 72 is fixedly mounted on the rotating cylinder 10 through a fixed ring seat. The incomplete gear ring 72 includes a toothless section and a toothed section. The toothless section is located above the toothed section. The gear 71 corresponds to the drive shaft 6 one by one and is coaxially fixedly connected. As the turntable 1 rotates, the gear 71 will mesh with the toothed section when passing through the toothed section and drive the spiral conveying structure 3 to rotate. When the gear 71 passes through the toothless section, the spiral conveying structure 3 stops rotating. The spiral conveying structure 3 of the present invention not only conveys materials, but also forms a dynamic airflow barrier through intermittent drive (controlled by the incomplete gear ring 72) and discharge pressure regulation (high and low outlet flow difference), rather than the traditional method of only having a material conveying function.

[0027] See Figure 2 、 Figure 4 、 Figure 5 and Figure 7, a concave collection area 8 is provided on the side of the turntable 1 close to the rotary drying area (i.e. the left side), and the collection area 8 is a ring structure; an extension body is fixedly connected to the left end of the turntable 1, and the extension body is sealed with the right port of the rotating cylinder 10, the extension body is conical with the top of the cone facing left, and the diameter of the left end of the extension body is greater than or equal to the diameter of the rotating cylinder 10, the extension body and the turntable 1 cooperate to form the collection area 8, and the material will directly enter the collection area 8 after the rotary drying of the rotating cylinder 10; a plurality of radial baffles 9 distributed circumferentially are provided in the collection area 8, and the radial baffles 9 are inclined and set to collect the collection area 8 It is divided into several aggregate units, each of which corresponds to the transfer channel 2 one by one and guides the material inside to the left end of the transfer channel 2. The material dried by the rotating cylinder 10 will directly enter the aggregate unit in the aggregate area 8. As the turntable 1 rotates, the material in the aggregate unit will move accordingly, which is conducive to fully extending the time the material stays in the transfer channel 2 and correspondingly extending the continuous working time of the spiral conveying structure 3, effectively improving the efficiency of material transfer, and thus effectively avoiding abnormal accumulation and retention of materials, which is conducive to improving the efficiency of continuous material processing and the stability of the processing process. The turntable 1, the blocking plate 43, the aggregate unit and other components in the present invention form a closed-loop optimization around the spiral conveying structure 3.

[0028] See Figure 2 、 Figure 3 and Figure 4 , an isolation guide structure 5 is provided on the right side of the turntable 1, and the isolation guide structure 5 includes a connector 52 provided with an outer guide surface 51, and the connector 52 is fixedly mounted on the right end of the turntable 1, and a plurality of circumferentially arranged concave guide areas 53 are provided on the outer guide surface 51, and the concave guide areas 53 correspond to the discharge structures 4 one by one. Due to the opening of the concave guide areas 53, the outer wall of the outer guide surface 51 forms a circumferentially extending wavy structure. As the turntable 1 rotates, when the discharge structure 4 is located in the isolation guide structure 5, the material flowing out of the low-position auxiliary outlet 42 will fall into the concave material guide area 53 and move to the right along the concave material guide area 53, preventing the material from falling directly downward and falling on the discharge structure 4 below, thereby improving the stability of the material conveying process. Among them, the connecting body 52 is an annular structure and an inner flow resistance surface 54 is provided therein, and the outer guide surface 51 is a conical structure fixedly sleeved on the outer side of the connecting body 52. ​​The inner flow resistance surface 54 is a conical structure and its cone top direction is opposite to that of the outer guide surface 51. Figure 4 As shown, the cone top of the inner flow-blocking surface 54 faces leftward. When the material falls on the inner side of the connecting body 52 , the inner flow-blocking surface 54 can effectively prevent the material from staying on the inner side of the connecting body 52 .

[0029] See Figure 2 and Figure 5, a drying airflow is introduced into the rotating cylinder 10, the airflow enters from the left end of the rotating cylinder 10, and then flows out from the outlet 13 on the turntable 1; a cooling airflow is introduced into the rotating cylinder 2 11, the airflow enters from the right end of the rotating cylinder 2 11, and then flows out from the outlet 2 14 on the turntable 1; Figure 2 As shown, outlet 1 13 is arranged at the left end of the turntable 1, and outlet 2 14 is arranged at the right end of the turntable 1, and both are sealedly connected with a guide pipe 15, which is distributed along the radial direction of the turntable 1 and extends to the outside of the turntable 1. A mounting seat 16 is provided on the outside of the turntable 1, and two annular flow channels 17 are provided on the mounting seat 16. The end of the guide pipe 15 sealedly connected to outlet 1 13 is located in the annular flow channel 17 on the left, and the end of the guide pipe 15 sealedly connected to outlet 2 14 is located in the annular flow channel 17 on the right. The turntable 1 is sealed and rotatably connected to the mounting seat 16, and the end of the guide pipe 15 is always located in the corresponding annular flow channel 17 and is connected to the annular flow channel 17. The mounting seat 16 is detachably connected with a derivation pipe 18 that corresponds to and is connected to the annular flow channel 17 one by one. At this point, two airflow paths that do not interfere with each other are formed, and the input and output of the drying airflow and the cooling airflow are completely independent, and the drying and cooling processes are continuously and efficiently carried out.

[0030] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0031] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "connected," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, integral or sliding connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rotary dryer, characterized in that: It includes a linearly distributed rotary drying area and a rotary cooling area, and a material transfer area is set between the rotary drying area and the rotary cooling area. The material transfer area includes: A rotary disc is hermetically disposed between the rotary drying zone and the rotary cooling zone; A plurality of transfer channels passing through the turntable, the transfer channels are distributed along the circumference of the turntable and connect the rotary drying zone and the rotary cooling zone; The spiral conveying structure is set in the transfer channel and is used to actively push the material from the rotary drying zone to the rotary cooling zone, and the material forms a dense airflow barrier layer in the transfer channel. During the rotation of the turntable, the dense airflow barrier layer in the transfer channel always exists, and the material drop point continuously changes and falls in a dispersed manner. The discharge structure is arranged at the end of the transfer channel close to the rotating cooling zone; The discharge structure includes a high-position main outlet located above the transfer channel and a low-position auxiliary outlet located below the transfer channel, wherein the flow cross-sectional area of ​​the low-position auxiliary outlet is smaller than that of the high-position main outlet; The pushing volume per unit time of the spiral conveying structure is greater than the flow volume of the low-level auxiliary outlet and less than the flow volume of the high-level main outlet. The material first flows out from the low-level auxiliary outlet, accumulates to cover the transfer channel port, and then enters the rotary cooling zone from the high-level main outlet. The dynamic accumulation of material at the transfer channel port also forms an airflow barrier. The turntable is fixedly sealed and connected to the first rotating cylinder, and is rotatably sealed and connected to the second rotating cylinder. The rotation direction of the second rotating cylinder is opposite to that of the first rotating cylinder.

2. A rotary dryer according to claim 1, characterized in that: The discharging structure also includes a blocking disk, which is inclined from top to bottom toward the transmission channel and is rotatably mounted on the turntable. A counterweight area is provided on the side of the blocking disk away from the transmission channel. During the rotation of the turntable, the blocking disk automatically rotates under the action of the counterweight area while maintaining an unchanged inclination angle. Side baffles are symmetrically provided on the blocking disk. The area between the portion of the blocking disk below the side baffle and the turntable constitutes a low-level auxiliary outlet, and the area between the portion above the blocking disk and the turntable constitutes a high-level main outlet.

3. A rotary dryer according to claim 1 or 2, characterized in that: An isolation material guiding structure is provided on the side of the turntable close to the rotating cooling zone. The isolation material guiding structure includes a connector provided with an outer guide surface. The connector is fixedly installed on the right end of the turntable. A plurality of circumferentially arranged concave material guiding areas are provided on the outer guide surface. The concave material guiding areas correspond one-to-one to the discharge structure.

4. A rotary dryer according to claim 3, characterized in that: The connector is an annular structure and is provided with an inner flow resistance surface therein. The inner flow resistance surface is a conical structure and the direction of its cone top is opposite to that of the outer guide surface. Due to the opening of the concave material guide area, the outer side wall of the outer guide surface forms a circumferentially extending wave-shaped structure.

5. The rotary dryer according to claim 1, characterized in that: When no material enters the end of the transmission channel close to the rotary drying zone as the turntable rotates, the spiral conveying structure stops pushing.

6. A rotary dryer according to claim 5, characterized in that: One end of the spiral conveying structure is connected to a driving shaft, which rotates and passes through the outside of the turntable and is connected to a driving source. The driving source includes a gear and an incomplete gear ring. The gear corresponds to the driving shaft one by one and is coaxially fixedly connected. The incomplete gear ring is fixedly set. As the turntable rotates, when the gear passes through the tooth area of ​​the incomplete gear ring, the spiral conveying structure is driven to rotate due to engagement.

7. A rotary dryer according to any one of claims 1, 5 and 6, characterized in that: A concave material collection area is provided on the side of the turntable close to the rotary drying area. The material collection area is an annular structure, and a plurality of radial material baffles distributed circumferentially are provided in the material collection area. The radial material baffles correspond one-to-one to the transfer channels, and the radial material baffles are used to prolong the time that the material stays at the entrance of the transfer channel during the rotation of the turntable.

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