Air drying device

Abstract

The present invention relates to an air drying device, comprising a box, a drum and a heating fan; the drum and the heating fan are both installed in the box, and the heating fan forms an internal circulation of wind; wherein: an air inlet and a dehumidification port for replenishing air are arranged on the box; a conveyor belt and a discharging conveyor belt are arranged horizontally suspended in the horizontally arranged drum, and the lateral operation of the conveyor belt can receive the materials dropped from the upper side of the drum, and transfer them to the lower side of the drum and drop them into the drum wall, so as to circulate; the dried materials are transferred from the discharging conveyor belt to the drum. The present invention has the characteristics of ingenious conception, reasonable design, and the materials can be evenly heated and dried; the drum is arranged in the box, which can not only ensure dehumidification, but also make better use of the waste heat of the air, improve the thermal efficiency and reduce the energy consumption of the setting.

Description

Technical field:

[0001] The invention belongs to the field of drying equipment, and particularly relates to an air drying device, and in particular to a drying device which can utilize circulating air to realize waste heat recycling. Background technology:

[0002] The existing drying drum uses the rolling of the drum to turn the material so that the dried material can be evenly contacted with the heat source, which includes the heat source that heats the drum body and the hot air blown into the drum. In the traditional form of drying drum, the material to be dried only uses about one-quarter of the inner surface of the drum during operation, and the rest of the inner surface of the drum cannot hold the material, resulting in low efficiency. For this reason, the industry has also designed lifting blades on the inner surface of the drum to keep as much material as possible between the drum walls and lift it up. This solution greatly improves the contact time between the material and the drum wall, so that more than half of the drum wall can be hung with material, and the material can be thrown down at a high position. For example:

[0003] Patent application No. 201610687500.6 discloses a high-efficiency drum dryer, including: a primary drum and a secondary drum, wherein the primary drum and the secondary drum are respectively provided with a primary material lifting blade and a secondary material lifting blade, wherein the primary material lifting blade is a twisted material lifting blade, and the secondary material lifting blade is a straight material lifting blade, wherein an air distributor is provided at the entrance of the primary drum, and an air inlet is provided at the middle position of the entrance of the primary drum, and the air inlet is connected to a hot air blower through an air duct, wherein a feed inlet is provided at the top of the primary drum, and a discharge outlet is provided at the lower part of the tail of the secondary drum, and an exhaust outlet is provided at the upper part of the tail end surface of the secondary drum, and a hot air exhaust fan is installed in the exhaust outlet. From the disclosed lifting blades in the illustration, they are all umbrella-shaped, fixed to the inner surface of the drum by the end of the umbrella handle, and the lifting blade can be used to lift the material to the top of the drum and then gradually slide down naturally; and an inclined drum arrangement is adopted to facilitate discharge.

[0004] Patent application No. 201710709427.2 discloses a drying device, including a combustion zone and a drying zone. A drum is provided in the drying zone, and a lifting blade is provided on the inner wall of the drum. The lifting blade is used to lift the material transported to the drum at the bottom of the drum, and sprinkle the material downward to form a material curtain during the rotation of the drum, so that the material can exchange heat with the hot air generated in the combustion zone during the sprinkling process. In this technology, the traditional L-shaped lifting blade is improved into a double L-shaped and K-shaped structure. The former can layer the material and spread it step by step, and the latter can bring the material to the top of the drum and go around to the other side, so that the material can be spread on both sides of the drum, and the middle is a material-free area for the combustion smoke to pass through.

[0005] Patent application No. 202010527311.9 discloses a blade structure of a drying drum, including a plurality of toothed material-lifting blades and a plurality of cradle-type material-containing blades connected to the inner wall of the drum in a circular array; the toothed material-lifting blades are located on the side close to the feed end of the drum, and the cradle-type material-containing blades are located on the side close to the discharge end of the drum. The toothed material-lifting blades are L-shaped, processed into a tooth shape at the discharge edge and hung with impact chains; and the cradle type is a cradle that can rotate freely suspended on a bracket. After the cradle is filled with materials, it rotates with the drum with the materials, and only the excess will be spread out.

[0006] The above three technologies use similar schemes to lift the materials to be dried and keep them on the inner wall of the drum for a longer time to improve the drying efficiency; each has its own specificity and cannot be used to dry all materials, especially brittle materials, which are easily scattered and hit and broken or incomplete in the early stage of drying. In addition, in addition to taking up space, a long drum also makes it difficult to balance the heat source or reuse the waste heat. Summary of the invention:

[0007] The purpose of the present invention is to design an air drying device which can transport materials from the upper surface side of a drum to the lower surface side and can increase the evaporation amount.

[0008] The technical solution of the present invention is implemented as follows: an air drying device comprises a box, a drum and a heating fan; the drum and the heating fan are both installed in the box, and the heating fan forms an internal circulation of wind; the characteristics are:

[0009] The box body is provided with an air inlet and a moisture outlet, and serves as the housing of the device to collect waste heat;

[0010] The drum is horizontally arranged in the box, has an air inlet end and a material discharge end, is supported by rollers on both sides, and rotates forward or reversely under the drive of the motor; baffle plates are arranged at intervals on the circumference of the inner surface of the drum, and a plurality of baffle plates are arranged in parallel in the axial direction; a conveyor belt and a material discharge conveyor belt are suspended in the drum;

[0011] The heating fan is arranged in the box, and the air outlet pipe extends from the air inlet end of the drum, and can supply air to the conveyor belt and the low position of the drum; the steel structure bracket is fixed in the box and extends into the drum to form a suspended support for the conveyor belt and the discharge conveyor belt;

[0012] The conveyor belt is horizontally arranged in the drum and is suspended by a steel frame. The horizontal movement of the conveyor belt can receive the materials dropped from the upper side of the drum, convey them to the lower side of the drum and drop them onto the drum wall, thus circulating.

[0013] The discharge conveyor belt is suspended above the conveyor belt and is axially locked on the steel structure support on the downstream side of the drum. It receives the dried material dropped from the reverse rotating drum and conveys it to the discharge end of the drum.

[0014] A hot air distribution mechanism is also suspended in the drum, and the hot air distribution mechanism includes: a hood, an air collecting cylinder and an air outlet plate; the hood is arranged at a high position and is connected to the air outlet pipe of the heating fan, and an air uniform plate is arranged at the bottom of the hood, and the air uniform plate blows toward the surface of the conveyor belt; the air collecting cylinder is longitudinally enclosed around the conveyor belt, collects the hot air reflected and passing through the conveyor belt, and blows it to the inner surface of the bottom of the drum through the air outlet plate; the air outlet plate has the same curvature as the drum.

[0015] An air outlet slot parallel to the axis is provided at the junction of the air collecting cylinder and the air outlet hole plate, and a strip fan is provided between the bottom of the conveyor belt and the air outlet slot, and the air outlet of the strip fan faces the drum wall.

[0016] The box body is a rectangular structure, with a box door for loading and unloading materials at one end. The discharge end of the drum is close to the box door, with a distance from the box door between 5cm and 15cm. The air inlet is arranged at the lower side of the box body, and the moisture outlet is arranged at the top of the box body, and both are located at one end of the box door.

[0017] The box body and the discharge end of the drum are also provided with an air duct baffle to form a dehumidification return air duct, which is connected to the dehumidification port at the top and the suction port of the heating fan; the suction port of the heating fan is also connected to the external space of the drum to inhale air supplemented from the air inlet.

[0018] A circulation fan is respectively arranged at two corners of the bottom enclosed by the box body and the drum, and the circulation fan is arranged at one end of the heating fan.

[0019] The feeding end of the conveyor belt is also provided with a material receiving and removing roller, and a material leveling scraper with an adjustable distance from the conveyor belt is also provided near the feeding end; the roller surface of the material receiving and removing roller has a removing tooth, which rotates toward the conveyor belt to feed the material under the drive of the motor.

[0020] Conical sleeves are arranged at both ends of the drum, and ports of the conical sleeves form an air inlet end and a material outlet end.

[0021] The present invention has the characteristics of ingenious conception, reasonable design and uniform heating of materials; it greatly improves the defects of material accumulation on the drum or the baffle plate, and utilizes the transverse conveyor belt, which can not only directly transfer the material from one side of the drum to the other side, thereby expanding the effective utilization area of ​​the drum, but also the material is evenly spread on the conveyor belt, and the upper and lower transparency can accept the maximum heat exchange and provide the maximum evaporation space, especially in conjunction with the hot air distribution mechanism, the material passing through the conveyor belt can obtain uniform hot air, thereby achieving a three-dimensional air-drying effect; the drum is arranged in the box, which can not only ensure dehumidification, but also better utilize the waste heat of the air, improve thermal efficiency and reduce the energy consumption of the arrangement. Description of the drawings:

[0022] The present invention will be further described below in conjunction with specific illustrations:

[0023] Figure 1 Schematic diagram of the end of the air drying device

[0024] Figure 2 Schematic diagram of the cross section of the air drying device

[0025] Figure 3 Schematic diagram of the relationship between the roller and the conveyor belt in the cross section of the air drying device

[0026] Figure 4 Schematic diagram of the relationship between the drum and the hot air distribution mechanism in the cross section of the air drying device

[0027] Figure 5 Schematic diagram of the axial section of the air drying device

[0028] Figure 6 Schematic diagram of the cross section of the air drying device from top view

[0029] in

[0030] 1—Box 11—Air inlet 12—Dehumidification outlet 121—Exhaust fan

[0031] 13—Box door 14—Electric control panel 15—Observation window 16—Air duct baffle

[0032] 17—Dehumidification return air duct 18—Circulation fan 2—Drum 21—Air inlet end

[0033] 22—discharging end 23—blocking plate 24—cone sleeve 3—heating fan

[0034] 31—air outlet pipe 4—steel support 5—conveyor belt 51—material receiving and removing roller

[0035] 511—shifting teeth 52—scraper for material distribution 6—discharging conveyor belt 7—power mechanism

[0036] 71 - motor 72 - gearbox 73 - shaft 74 - roller

[0037] 8—hot air distribution mechanism 81—wind hood 811—air uniformity plate 82—wind collecting tube

[0038] 83—air outlet plate 84—air outlet slot 9—strip fan Specific implementation method:

[0039] Reference Figures 1 to 6 The air drying device comprises a box body 1, a drum 2, a heating fan 3, a steel support 4, a conveyor belt 5 and a discharging conveyor belt 6; the drum 2 and the heating fan 3 are both installed in the box body 1, and the heating fan 3 forms an internal circulation of wind to improve the utilization of waste heat; wherein:

[0040] The box body 1 is provided with an air inlet 11 and a dehumidification port 12, and is used as the housing of the device to collect waste heat and hot steam discharged from the drum 2. Part of the steam is discharged from the dehumidification port 12. Negative pressure is generated in the box body 1, and the external air is automatically sucked in from the air inlet 11 to maintain the air pressure balance. Figure 1 and Figure 5 .

[0041] The drum 2 is horizontally arranged in the housing 1, has an air inlet end 21 and a material discharge end 22, and is driven to rotate by a power mechanism 7; the power mechanism 7 includes a motor 71, a gearbox 72, a rotating shaft 73 and a roller 74; the drum 2 is supported by rollers 74 on both sides, and is driven by the motor 71 to rotate forward or reversely to complete actions such as drying and material discharge. Baffle plates 23 are spaced apart on the circumference of the inner surface of the drum 2, and a plurality of baffle plates 23 are axially parallel and distributed. In this example, conical sleeves 24 are provided at both ends of the drum 2, and the ports of the conical sleeves 24 form the air inlet end 11 and the material discharge end 12, which have the effect of narrowing the two ends of the drum 2, and are also a measure to reduce the leakage of hot air, such as Figure 2 and Figure 5 .

[0042] Furthermore, the box body 1 is a rectangular structure, and a box door 13 for loading and unloading is set at one end. The discharge end 22 of the drum 2 is close to the box door 13, and the distance between the drum 2 and the box door 13 is between 5cm and 15cm. The shorter distance is for the convenience of operation during loading and unloading, and for reducing the large and rapid overflow of hot air from the drum 2 at the discharge end 22, thereby increasing the heat exchange time with the material and reducing the air supply. The air inlet 11 is arranged at the lower side of the box body 1, and the dehumidification port 12 is arranged at the top of the box body 1. In particular, the dehumidification port 12 is at one end of the box door 13 of the box body, and can directly discharge wet steam. The inhaled cooler air can exchange heat with the hot steam and the surface of the drum, and then flow through the heating fan 3 to be inhaled and reheated, so as to achieve waste heat utilization and reduce energy consumption. To this end, an exhaust fan 121 is provided at the dehumidification port 12, and the air inlet 11 is only an opening, which can be supplemented by natural suction using negative pressure. Figure 1 and Figure 5 Of course, the dehumidification port 12 may not be provided with an exhaust fan. Due to its high position, the hot steam can be automatically discharged upward. In order to achieve controllable dehumidification, an adjustable damper may be provided at the dehumidification port 12, which can be adjusted by electric control. In addition, the box body 1 is also provided with an electric control panel 14 and an observation window 15 at the end of the box door 13, so as to observe various parameters, adjust the air drying process in real time, and visually observe the internal operation.

[0043] In order not to interfere with dehumidification and improve the utilization of waste heat, an air duct baffle 16 is also provided between the box body 1 and the discharge end 22 of the drum to separate the drum 2 from the discharge end 22, forming a dehumidification return air duct 17, which is connected to the dehumidification port 12 at the top and the suction port of the heating fan 3; the suction port of the heating fan 3 is also connected to the external space of the drum 2, and sucks in the air supplemented from the air inlet 11; that is, the dehumidification port 12 is on the same side as the discharge end 22, and the air inlet 11 is on the same side as the drum 2; in this way, the wet steam discharged from the discharge end 22 is separated from the surface of the drum 2, and is directly connected to the dehumidification port 12 and the heating fan 3 is connected, a part of the wet steam is discharged, and a part enters the heating fan 3 for reheating circulation, so as to achieve the purpose of waste heat utilization; and the colder air entering through the air inlet 11 can exchange heat with the surface of the drum 2 before entering the heating fan 3, so as to reduce energy consumption and heating time; for this reason, the air inlet 11 is arranged at a position away from the heating fan 3, and a circulating fan 18 is respectively arranged at the two corners of the bottom enclosed by the box body 1 and the drum 2, and the circulating fan 18 is arranged at one end of the heating fan 3 to form a turbulent flow, which is conducive to the air flow exchange on the surface of the drum 2, especially the heat exchange of the colder air sucked in from the air inlet 11.

[0044] The heating fan 3 is arranged in the housing 1 and is located at the air inlet end of the drum. It extends from the air inlet end 11 of the drum through the air outlet pipe 31 and can deliver air to the conveyor belt 5 and the low position of the drum 2 suspended in the drum. More specifically, the air outlet pipe 31 is also connected to a hot air distribution mechanism 8 inside the drum. In this example, the heating fan 3 includes an electric heating part. Since the electric heating element is small, it can be directly locked on the air duct. For this reason, only the fan and the air duct are shown; if an external heat source is used, the air inlet of the heating fan 3 can be connected through the air inlet duct, such as Figure 5 .

[0045] The steel support 4 is fixed in the box 1 and extends into the drum 2 to form a suspended support for the conveyor belt 5 and the discharge conveyor belt 6. In this example, the steel support 4 is directly wrapped by the air outlet pipe 31 at the end of the heating fan 3 and then extends into the drum 2; the cone sleeve 24 corresponding to this end is welded to the drum 2 and rotates with the drum, and there is a movement gap between the air inlet pipe 31 and the cone sleeve 24; the cone sleeve 24 at the other end can be welded to the drum 2 or a separate structure can be used, such as Figure 5 It is a welded structure. The steel support 4 passes through the cone sleeve 24 and is fixed to the conveyor belt 5 or other related equipment inside the drum to form stable supports at both ends and suspend the internal settings.

[0046] The conveyor belt 5 is horizontally arranged in the drum 2 and is suspended by the steel frame 4. The horizontal operation of the conveyor belt 5 can receive the materials dropped from the upper side of the drum 2, convey them to the lower side of the drum 2 and drop them into the drum wall, so as to circulate them, making the best use of the drum wall below the level of the drum 2 and preventing the materials from falling and being smashed. The materials are transferred from the surface of the drum 2 to the conveyor belt 5, which can not only flatten them but also form a transparent three-dimensional exchange with the hot air. Figure 2 and Figure 3 In this example, the conveyor belt 5 is slightly inclined, mainly to avoid the position of the discharge conveyor belt 6. It can also be arranged horizontally, and it may be related to the properties of the air-dried material and the rotation speed of the drum 2. The closer to the horizontal, the larger the radial effective area.

[0047] Furthermore, the feeding end of the conveyor belt 5 is also provided with a material receiving and removing roller 51, and a material leveling scraper 52 with an adjustable distance from the conveyor belt is also provided near the feeding end; the roller surface of the material receiving and removing roller 51 is provided with a tooth 511, and the tooth 511 rotates toward the conveyor belt under the drive of the motor to feed the material. The material receiving and removing roller 51 is used to receive the falling material by the baffle plate 23 close to the inner surface of the drum, and the material that is clumped or stuck together can be removed with the help of the tooth 511, especially at the beginning of drying, the material can be effectively dispersed and gradually fall onto the conveyor belt 5, and then flattened by the material leveling scraper 52. This is particularly important for the initial pouring of drying material directly from the discharge end 22. After the drum 2 rotates for several weeks, the material can be evenly distributed to the effective area of ​​the drum, with less manual intervention.

[0048] like Figure 2 , Figure 4 and Figure 5 In order to make the hot air have a better exchange effect in the drum 2, a hot air distribution mechanism 8 is suspended in the drum 2, and the hot air distribution mechanism 8 includes: a hood 81, an air collecting tube 82 and an air outlet plate 83; the hood 81 is arranged at a high position and is connected with the air outlet pipe 31 of the heating fan, and a uniform air plate 811 is arranged at the bottom of the hood 81, and the uniform air plate 811 blows toward the surface of the conveyor belt 5, that is, a part of the incoming air from the air inlet pipe 31 passes through the space formed by the hood 81 and the uniform air plate 811, and after reaching a uniform or stable airflow, it is evenly blown to the conveyor belt 5 through the uniform air plate 811 to ensure uniform air volume and heat. The air collecting cylinder 82 is longitudinally enclosed around the conveyor belt 5, collecting the hot air reflected and passing through the conveyor belt 5, as well as a part of the hot air input from the air inlet pipe 31. In other words, it also maintains the conveyor belt at the center and temperature of the hot air, so that the material can be evenly dried; the air outlet hole plate 83 is arranged at the bottom of the air collecting cylinder 82, and the hot air is blown to the inner surface of the bottom of the drum 2 by the air outlet hole plate 83, so as to achieve the effect of evenly distributing the air volume again, and form a drop effect with high temperature in the upper layer and low temperature in the lower layer; further, the air outlet hole plate 83 has the same curvature as the drum 2 to ensure equidistant blowing.

[0049] Furthermore, at the junction of the air collecting cylinder 82 and the air outlet plate 83, an air outlet slot 84 parallel to the axis of the drum is provided, and between the bottom of the conveyor belt 5 and the air outlet slot 84, a strip fan 9 is provided, and the air outlet of the strip fan 9 faces the drum wall. In theory, the air blown out can form an equal rebound up and down on the drum wall. By utilizing the upward rebound wind, the falling material can be blown upward from the bottom, so that the falling material is completely exposed to the hot air. Secondly, the material can be blown into the conveyor belt 5 more smoothly, and the material on the drum 2 and the conveyor belt 5 can be circulated once, and can pass through different temperature and wind speed areas, and the alternation is conducive to the evaporation of the moisture inside the material.

[0050] The progress of material drying can be judged by the humidity sensor set on the wet port 12, and the hot air temperature can be adjusted to achieve a more intelligent energy-saving drying effect. The material can be discharged after drying is completed. For this purpose, a discharge conveyor belt 6 is arranged in the drum 2. The discharge conveyor belt 6 is suspended above the conveyor belt 5 and is axially locked on the steel structure support 4 on the downstream side of the drum 2. It receives the dried material dropped from the reverse rotating drum 2 and conveys it to the drum discharge end 22. More specifically, on the cone sleeve 24 corresponding to the discharge end 22, a support for placing a slide plate or a chute is reserved. When discharging, the slide plate or the chute is placed in place, and the material sent by the discharge conveyor belt 6 falls into the slide plate or the chute, and then is led out of the box door 13, directly loaded into the turnover frame for storage, and transferred to the next process. In addition, the setting height of the discharge conveyor belt 6 can be determined according to the speed of the reverse rotation of the drum 2. Of course, the higher it is, the more space can be left for the conveyor belt 5 to avoid, so that the conveyor belt 5 reaches the maximum area, such as Figure 2 and Figure 3 .

[0051] The conveyor belt 5 and the discharge conveyor belt 6 both adopt a grid structure, that is, a standard grid conveyor belt.

Claims

1. An air drying device, comprising a housing (1), a drum (2) and a heating fan (3); the drum (2) and the heating fan (3) are both installed in the housing (1), and the heating fan (3) forms an internal circulation of air; characterized in that: The box body (1) is provided with an air inlet (11) and a moisture outlet (12), and serves as a device shell for collecting waste heat; The drum (2) is horizontally arranged in the box body (1), has an air inlet end (21) and a material discharge end (22), is supported by rollers on both sides, and is driven by a motor to rotate in a forward or reverse direction; baffle plates (23) are arranged at intervals on the circumference of the inner surface of the drum (2), and a plurality of baffle plates (23) are arranged in parallel in the axial direction; a conveyor belt (5) and a material discharge conveyor belt (6) are suspended in the drum (2); A heating fan (3) is arranged in the housing (1), and an air outlet pipe (31) extends from the air inlet end (21) of the drum and can supply air to the conveyor belt (5) and the lower part of the drum (2); A steel structure support (4) is fixed in the box body (1) and extends into the roller (2) to form a suspended support for the conveyor belt (5) and the discharge conveyor belt (6); The conveyor belt (5) is transversely arranged in the drum (2) and is suspended by the steel support (4); the transverse movement of the conveyor belt (5) can receive materials dropped from the upper side of the drum (2), convey them to the lower side of the drum (2) and drop them onto the wall of the drum (2), thereby circulating; The discharge conveyor belt (6) is suspended above the conveyor belt (5) and is axially locked on the steel structure support (4) on the downstream side of the roller (2). It receives the dried material dropped from the reverse rotating roller (2) and conveys it to the discharge end (22) of the roller.

2. The air drying device according to claim 1, characterized in that: A hot air distribution mechanism (8) is also suspended in the drum (2), and the hot air distribution mechanism (8) comprises: a hood (81), an air collecting tube (82) and an air outlet plate (83); the hood (81) is arranged at a high position and is connected to the air outlet pipe (31) of the heating fan; a uniform air plate (811) is arranged at the bottom of the hood (81), and the uniform air plate (811) blows toward the surface of the conveyor belt (5); the air collecting tube (82) longitudinally surrounds the conveyor belt (5), collects hot air reflected from and passing through the conveyor belt (5), and blows the hot air toward the inner surface of the bottom of the drum (2) through the air outlet plate (83); the air outlet plate (83) has the same curvature as the drum (2).

3. An air drying device according to claim 2, characterized in that: An air outlet slot (84) parallel to the axis is provided at the junction of the air collecting cylinder (82) and the air outlet hole plate (83), and a strip fan (9) is provided between the bottom of the conveyor belt (5) and the air outlet slot (84), the air outlet of the strip fan (9) facing the drum wall.

4. The air drying device according to claim 1, characterized in that: The box body (1) is in a rectangular structure, and a box door (13) for feeding and discharging materials is arranged at one end. The discharge end (22) of the drum is close to the box door (13), and the distance between the drum and the box door (13) is between 5 cm and 15 cm. The air inlet (11) is arranged at the lower side of the box body (1), and the dehumidification port (12) is arranged at the top of the box body (1), and the dehumidification port (12) is located at one end of the box door (13).

5. The air drying device according to claim 4, characterized in that: The box body (1) and the discharge end (22) of the drum are also provided with an air duct baffle (16) to form a dehumidification return air duct (17) which is connected to the dehumidification port (12) at the top and to the suction port of the heating fan (3); the suction port of the heating fan (3) is also connected to the external space of the drum (2) to inhale air supplemented from the air inlet (11).

6. An air drying device according to claim 5, characterized in that: A circulation fan (18) is disposed at each of the two corners of the bottom enclosed by the box body (1) and the drum (2), and the circulation fan (18) is disposed at one end of the heating fan (3).

7. An air drying device according to claim 1 or 2, characterized in that: A material receiving and removing roller (51) is also provided at the feeding end of the conveyor belt (5), and a material leveling scraper (52) whose spacing from the conveyor belt (5) is adjustable is also provided near the feeding end; the roller surface of the material receiving and removing roller (51) is provided with a tooth (511), and the tooth (511) is rotated in the direction of the conveyor belt (5) to feed the material under the drive of a motor.

8. An air drying device according to claim 1, 2, 3, 4 or 5, characterized in that: Conical sleeves (24) are provided at both ends of the drum (2), and the ports of the conical sleeves (24) form an air inlet end (21) and a material outlet end (22).

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