Roller dryer

Abstract

The invention relates to a roller dryer which comprises a roller body, a feeding end and a discharging end are arranged at the two ends of the roller body respectively, a crushing and stirring device and a flow guiding device are arranged in the roller body, and the flow guiding device comprises a feeding area shoveling plate section, a middle area shoveling plate section and a discharging area shoveling plate section which are sequentially arranged from the feeding end to the discharging end; the feeding area shoveling plate section comprises a plurality of feeding area shoveling plate groups, and each feeding area shoveling plate group comprises a first inclined shoveling plate which is circumferentially fixed on the inner wall of the cylinder body; the middle area shoveling plate section comprises a plurality of middle area shoveling plate groups; each middle area shoveling plate group comprises a second inclined shoveling plate and a horizontal shoveling plate which are circumferentially fixed on the inner wall of the cylinder body; the second inclined shoveling plates and the horizontal shoveling plates are arranged in a staggered manner; the discharging area shoveling plate section comprises a discharging area shoveling plate set, and the discharging area shoveling plate set comprises a plurality of third inclined shoveling plates circumferentially fixed to the inner wall of the barrel. By prolonging the retention time of the material, the drying effect of the super absorbent polymer is improved.

Description

Technical Field

[0001] This invention relates to the field of dryer technology, and in particular to drum dryers. Background Technology

[0002] Superabsorbent polymers (SAPs), as a class of novel functional polymer materials with super-strong water absorption and retention capabilities, have been widely used in hygiene products, agricultural water retention, and industrial dehydration due to their excellent swelling properties and stability. Because SAPs contain a large number of hydrophilic groups (carboxyl groups, hydroxyl groups, etc.), water is in a strongly bound state, resulting in a drying time much longer than conventional materials. They require a long residence time and sufficient contact with hot air to achieve the transformation from a high-moisture agglomerated state to a low-moisture particulate state. Therefore, the drying process places stringent requirements on the material retention control capabilities of the equipment.

[0003] Currently, rotary drum dryers, due to their combined functions of mixing and crushing with hot air drying, have become the mainstream equipment for drying superabsorbent polymers. However, they have three main drawbacks in terms of long drying time requirements: First, the lifting plates are mostly of a single structure, such as fully inclined or a few horizontal ones. Inclined lifting plates accelerate the flow but cause the material to flow too quickly, making it difficult to meet the long retention requirements. A few horizontal lifting plates are only used as an auxiliary and do not effectively control long retention. Second, the discharge port is a straight-through design without obstructions or buffer baffles. The material is easily affected by the tilt angle inside the drum and the stirring thrust, and some of it is discharged before the preset drying time is reached. Third, although some equipment has crushing and mixing components, the mixing shaft is made of ordinary metal (such as carbon steel), which lacks resistance to high moisture adhesion and corrosion. In addition, the inlet and outlet are sealed with clamp gaps, which easily leads to hot air leakage, which disrupts the stable high-temperature environment inside the drum and weakens the drying efficiency. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a drum dryer that improves the drying effect of superabsorbent polymers by extending the material residence time.

[0005] The above-mentioned objective of this invention is achieved through the following technical solutions: A rotary drum dryer includes a drum body with a feed end and a discharge end at both ends. The drum body is equipped with a crushing and stirring device and a flow guiding device. The feed end is equipped with an input device, and the discharge end is equipped with a collection device. The flow guiding device includes a feed zone lifting section, an intermediate zone lifting section, and a discharge zone lifting section arranged sequentially from the feed end to the discharge end. The feeding zone lifting plate section includes multiple feeding zone lifting plate groups, and each feeding zone lifting plate group includes a first inclined lifting plate that is circumferentially fixed to the inner wall of the cylinder. The intermediate zone lifting plate section includes multiple intermediate zone lifting plate groups, each of the intermediate zone lifting plate groups including a second inclined lifting plate and a horizontal lifting plate circumferentially fixed to the inner wall of the cylinder; the second inclined lifting plate and the horizontal lifting plate are arranged alternately. The discharge zone lifting plate section includes a discharge zone lifting plate group, which includes multiple third inclined lifting plates circumferentially fixed to the inner wall of the cylinder.

[0006] Through the above technical solution, the flow guiding device is refined into a three-section lifting plate structure: feeding zone, intermediate zone, and discharge zone. The first inclined lifting plate in the feeding zone is adapted to the material guiding requirements of the superabsorbent polymer in its initial high-moisture state. The second inclined lifting plate in the intermediate zone is arranged alternately with the horizontal lifting plate to force the material to slow down its flow and disperse evenly. The third inclined lifting plate in the discharge zone provides stable conveying. The three lifting plates work together to extend the overall residence time of the material in the cylinder, ensuring that the superabsorbent polymer has sufficient time to remove internal bound water throughout the entire process from a high-moisture agglomerated state to a low-moisture granular state, and avoiding incomplete drying caused by the rapid passage of the material.

[0007] As a further technical solution of the present invention: multiple inclined ring plates are fixed circumferentially between adjacent feeding zone lifting plate groups, between adjacent intermediate zone lifting plate groups, and at the junction of adjacent feeding zone lifting plate groups and intermediate zone lifting plate groups.

[0008] Through the above technical solution, the downward-sloping ring plate can not only block the superabsorbent polymer from flowing rapidly to the discharge end by using the tilt angle, but also guide the material to fall back along the plate surface to the lifting plate and material collection area, where it is continuously driven to rotate and come into contact with hot air, thus avoiding material accumulation and ineffective drying; finally, by slowing down the speed at which the material flows to the discharge end, it increases the dispersion time in the feeding area and the drying time in the intermediate area, which meets the requirement of superabsorbent polymer to be fully dried.

[0009] As a further technical solution of the present invention: the first inclined lifting plate, the second inclined lifting plate, the third inclined lifting plate and the horizontal lifting plate are all folded plate-shaped.

[0010] The above technical solution sets the four types of lifting plates into a folded plate shape, which has a stronger material-carrying capacity than flat plates. It can lift the material to a higher height and scatter it, extend the contact time with hot air, reduce the adhesion of highly absorbent polymers, ensure effective drying time, and meet the needs of deep dewatering.

[0011] As a further technical solution of the present invention: the included angle of the folding plate of the first inclined lifting plate is greater than the included angle of the folding plate of the second inclined lifting plate, the third inclined lifting plate and the horizontal lifting plate.

[0012] By using the above technical solution, the angle of the first inclined lifting plate is limited to be greater than that of the other lifting plates, so that the feeding zone is adapted to guide the high-moisture and viscous materials to prevent blockage. The conveying speed in the middle zone and the discharge zone is slowed down to extend the drying time, forming a gradient of "fast feeding, slow drying in the middle, and stable discharge", which ensures that the overall residence time of the superabsorbent polymer is controllable.

[0013] As a further technical solution of the present invention: a baffle is provided at the end of the discharge end.

[0014] Through the above technical solution, the added baffle can physically intercept the bottom overflow trend, forcing the material to rise and fall with the rotation of the drum, extending the retention path in the discharge area. On the other hand, by optimizing the height or installation angle of the baffle, it can be adapted to superabsorbent polymers with different moisture contents, and the final drying time of the material at the discharge end can be manually controlled to ensure that the moisture content meets the standard when discharged, while avoiding the entrainment of insufficiently dried material.

[0015] As a further technical solution of the present invention: the outer surface of the stirring shaft in the crushing and stirring device is covered with a stainless steel layer.

[0016] By using the above technical solution, a stainless steel layer is wrapped around the stirring shaft. With the help of the corrosion resistance and anti-adhesion properties of stainless steel, the stirring shaft can efficiently crush high-moisture agglomerated materials, avoid insufficient local drying, and indirectly ensure the effective drying time of the superabsorbent polymer.

[0017] As a further technical solution of the present invention: the inner wall of the cylinder is provided with a plurality of dual-fluid nozzles.

[0018] The above technical solution uses a dual-fluid nozzle on the inner wall of the cylinder to spray silicone oil, which solves the problem of highly absorbent polymers easily adhering to the cylinder wall or the lifting plate; it also prevents the flow path from shortening by preventing wall adhesion, thus preventing local drying dead zones; and it ensures that the residence time meets the drying requirements by maintaining the preset flow path.

[0019] As a further technical solution of the present invention: multiple brush-type sealing structures are provided at the connection between the feeding end and the outlet end of the input device and at the connection between the discharge end and the inlet end of the collection device. The brush-type sealing structure includes a sealing seat and brush bristles installed on the sealing seat.

[0020] Through the above technical solution, brush seals are installed between the feeding end and the input device, and between the discharge end and the collection device to prevent hot air leakage and dust overflow, maintain the high temperature stability inside the cylinder, reduce material loss, and ensure the retention and drying effect of the superabsorbent polymer in a stable environment.

[0021] As a further technical solution of the present invention: the receiving parts of the crushing and stirring device, the guiding device, the feeding device and the collecting device are all made of stainless steel.

[0022] By using the above technical solution, all receiving components in the process are made of stainless steel, which reduces material adhesion and residue, prevents corrosion and contamination from high-moisture materials, ensures smooth flow of the superabsorbent polymer throughout the process, maintains the overall residence time, and guarantees drying quality.

[0023] In summary, the present invention has at least one of the following beneficial technical effects: 1. This invention discloses a drum dryer, which, by setting the flow guiding device to a three-section structure arranged sequentially from the feed end to the discharge end, includes a feed zone lifting plate section (including a first inclined lifting plate), a middle zone lifting plate section (including staggered second inclined lifting plates and horizontal lifting plates), and a discharge zone lifting plate section (including a third inclined lifting plate), to meet the material guiding requirements of superabsorbent polymers from high humidity to low humidity throughout the entire drying process, forces the material to slow down its flow and disperse evenly, and at the same time extends the overall residence time of the material in the drum to ensure that the internal bound water is fully removed.

[0024] 2. The present invention discloses a drum dryer, which uses circumferentially fixed downward inclined ring plates between adjacent lifting plate groups and at the junction to block the rapid flow of materials, guide the materials back to the lifting plates to avoid accumulation, and extend the dispersion time in the feeding zone and the drying time in the intermediate zone.

[0025] 3. The present invention discloses a drum dryer, which intercepts bottom overflow by setting a baffle at the bottom inside the discharge end to extend the retention path of the discharge zone, regulates the final drying time, ensures that the discharge moisture content meets the standard, and prevents undried material from being carried in. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the drum dryer of the present invention.

[0027] Figure 2 for Figure 1 A schematic diagram of the flow guiding device on the inner wall of the middle cylinder.

[0028] Figure 3 for Figure 2 A schematic diagram showing the distribution of the central ring plate along the cross-section of the cylinder.

[0029] Figure 4 For along Figure 2 A cross-sectional view along line AA in the middle.

[0030] Figure 5 For along Figure 2 A cross-sectional view along the BB line.

[0031] Figure 6 For along Figure 2 A cross-sectional view of the CC line.

[0032] Figure 7 For along Figure 2 A cross-sectional view of the DD line.

[0033] Figure 8 For along Figure 2 A cross-sectional view of the EE line.

[0034] Figure 9 For along Figure 2 A cross-sectional view of the FF line.

[0035] Figure 10 Enlarged views of the second inclined copying plate, the horizontal copying plate, and the third inclined copying plate.

[0036] Figure 11 This is an enlarged view of the first inclined copying plate.

[0037] Figure 12 This is a cross-sectional view of the brush seal structure.

[0038] Figure 13 This is a right view of the drum dryer of the present invention.

[0039] Reference numerals: 1. Cylinder; 2. Feeding end; 3. Discharge end; 4. Crushing and mixing device; 5. Guide device; 6. Feeding device; 7. Collecting device; 8. Feeding zone lifting plate section; 81. First inclined lifting plate; 9. Intermediate zone lifting plate section; 91. Second inclined lifting plate; 92. Horizontal lifting plate; 10. Discharge zone lifting plate section; 101. Third inclined lifting plate; 11. Ring plate; 12. Baffle; 13. Mixing shaft; 14. Dual-fluid nozzle; 15. Brush seal structure; 151. Sealing seat; 152. Brush bristles. Detailed Implementation

[0040] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0041] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable 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 a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Example

[0043] Reference Figure 1 The rotary drum dryer disclosed in this invention includes a cylindrical body 1 for providing a drying space. The body 1 has a feed end 2 for material entry and a discharge end 3 for material exit at both ends. On the lower outer sides of the feed end 2 and discharge end 3, symmetrically arranged roller sets support the rotation of the body 1. A sprocket is circumferentially fixed to the outer wall of the body 1 and engages with a matching rolling drive device to drive the body 1 to rotate axially. Inside the body 1, a crushing and stirring device 4 for breaking up highly moist agglomerated materials and a guiding device 5 for guiding the orderly flow of materials are provided. An input device 6 for quantitatively dispensing the highly absorbent polymer to be dried is installed on the feed end 2, and a collection device 7 for collecting the dried material is correspondingly provided on the discharge end 3.

[0044] Reference Figure 2 The flow guiding device 5 is arranged along the axial direction of the cylinder 1 from the feed end 2 to the discharge end 3, with the feed zone lifting plate section 8, the intermediate zone lifting plate section 9, and the discharge zone lifting plate section 10 in sequence.

[0045] Reference Figure 2 The feeding zone lifting section 8 corresponds to the FF and EE areas and includes two independent feeding zone lifting groups. (Refer to...) Figure 8 and Figure 9 The first inclined lifting plate 81 of each feeding zone lifting plate group is folded plate shaped and is threadedly fixed to the inner wall of the cylinder 1 by angle steel connecting plates, and is inclined in the same direction as the clockwise rotation direction of the cylinder 1 (i.e., inclined towards the feeding end 2, with an inclination angle of 20°~35°). (Refer to...) Figure 11 The angle between the folds of the first inclined lifting plate 81 is 145°~150°, which is suitable for the slow flow characteristics of high-moisture viscous materials. Twenty-four first inclined lifting plates 81 are evenly arranged around the cylinder in each ring, forming a dense flow array in the feeding area, which is suitable for the quantitative feeding characteristics of the feeding device 6 and avoids material accumulation.

[0046] Reference Figure 2 The intermediate zone reading section 9 corresponds to areas BB, CC, and DD, and includes three sets of intermediate zone reading groups. (Refer to...) Figure 5 , Figure 6 and Figure 7In each intermediate zone of the lifting plate group, the second inclined lifting plate 91 (folded plate shape, inclined in the same direction, with an inclination angle of 20°~35°) and the horizontal lifting plate 92 (folded plate shape, with the plate surface perpendicular to the axis of the cylinder 1) are alternately arranged and fixed to the inner wall of the cylinder 1 by angle steel connecting plates. The second inclined lifting plate 91 and the horizontal lifting plate 92 are arranged cyclically along the circumference. (Refer to...) Figure 10 The angle between the folds of the second inclined lifting plate 91 and the horizontal lifting plate 92 is 130°~135°, which provides a smoother material surface and forces the material to slow down and stagnate. Twelve second inclined lifting plates 91 and twelve horizontal lifting plates 92 are arranged around the circumference of the cylinder in each ring, for a total of twenty-four lifting plates in each group. They work together to form a multi-layered slow-flow structure in the inter-zone: the second inclined lifting plates 91 lift the material to create eddies, and the horizontal lifting plates 92 receive and flatten the material, forcing the material to repeatedly pass through the drying medium, thereby enhancing the mass and heat transfer efficiency.

[0047] Reference Figure 2 The discharge zone lifting section 10 corresponds to area AA and includes a set of discharge zone lifting plates. The third inclined lifting plate 101 is folded plate shaped and is threadedly fixed to the inner wall of the cylinder 1 by angle steel connecting plates, arranged inclined in the same direction (inclination angle 20°~35°, towards the feed end 2). (Refer to...) Figure 10 The third inclined lifting plate 101 has an included angle of 130°~135°, which is suitable for the stable conveying and final moisture content control requirements of dried materials, ensuring uniform material discharge. (Refer to...) Figure 4 24 third inclined lifting plates 101 are evenly arranged around the circumference of the cylinder in each ring to ensure the orderly discharge of materials.

[0048] Reference Figure 2 The ring plate 11 is circumferentially fixed between the two sets of feed zone lifting plate groups, between adjacent intermediate zone lifting plate groups, and at the boundary between adjacent feed zone lifting plate groups and intermediate zone lifting plate groups. (Refer to...) Figure 3 Twenty-four ring plates 11 are evenly distributed around the inner circumference of the cylinder 1, matching the number of lifting plates to ensure no missed areas and extend material retention time. (Refer to...) Figure 3 The ring plate 11 is a straight plate structure, which is fixed to the cylinder wall by bolts to form a ring-shaped blocking array. It is inclined in the same direction as each inclined lifting plate, and the inclination angle (50°~55°) is greater than that of the lifting plate (20°~35°). When the material is lifted by the lifting plate and moves towards the discharge end 3, the ring plate 11 increases the resistance to the material climbing due to the steeper angle, forcing it to fall back along the plate surface to the material-catching area of ​​the lower lifting plate, blocking the rapid flow path, and prolonging the dispersion time in the feeding area and the drying time in the intermediate area.

[0049] Reference Figure 13The bottom of the discharge end 3 is provided with a baffle 12. The baffle 12 is adapted to the material overflow dead corner formed by the positioning of the stirring shaft 13 and the tilting of the lifting plate. On the one hand, it intercepts the short-circuit material that flows to the discharge end 3 before it is fully dried. On the other hand, it forces the overflow material to fall back into the lifting plate action area inside the cylinder 1 for secondary drying by moderately blocking it. The degree of drying is controlled by extending the residence time.

[0050] Reference Figure 1 Multiple dual-fluid nozzles 14 are installed along the inner wall of the cylinder 1. They are arranged in a staggered manner along the circumference of the inner wall of the cylinder 1 in the gap area of ​​the lifting plate, covering the high-risk areas of material sticking to the cylinder, such as the impact zone of the lifting plate falling and the dead corner of material accumulation between layers. The dual-fluid nozzles 14 form an anti-stick coating by spraying silicone oil, so as to avoid high-moisture material sticking to the cylinder wall and affecting the flow and drying efficiency.

[0051] Reference Figure 1 A brush-type sealing structure 15 is provided at the connection between the feed end 2 and the outlet end of the input device 6, and at the connection between the discharge end 3 and the inlet end of the collection device 7. (Refer to...) Figure 12 The brush-type sealing structure 15 consists of a sealing seat 151 and flexible bristles 152. By tightly fitting the bristles 152 with the material conveying channel, it effectively blocks the leakage of hot air inside the cylinder 1 and maintains a stable drying environment.

[0052] Reference Figure 1 The mixing shaft 13 of the crushing and mixing device 4 is wrapped with a stainless steel layer, which has both anti-stick and anti-corrosion properties, preventing high-moisture materials from sticking to the shaft and affecting the mixing efficiency. In addition, the material receiving parts in the crushing and mixing device 4, the guide device 5, the feeding device 6, and the collecting device 7 that come into direct contact with the materials are all made of stainless steel.

[0053] The working process of the drum dryer of this invention: The superabsorbent polymer to be dried is quantitatively fed into the feed end 2 via the feeding device 6. The brush-type sealing structure 15 at the connection between the feed end 2 and the feeding device 6, and between the discharge end 3 and the collection device 7, is synchronously sealed to prevent hot air leakage and dust intrusion.

[0054] After the material enters the cylinder 1, the crushing and stirring device 4 is started. The stirring shaft 13 with a stainless steel outer layer drives the crushing components to prevent sticking and crush the agglomerated material at the same time.

[0055] As the cylinder 1 rotates clockwise, the material enters the flow guiding device 5 for zoned drying. Feeding zone lifting section 8: The first inclined lifting plate 81 (145°~150° angle) scoops up the material, and the ring plate 11 between adjacent feeding zone lifting plate groups intercepts the crossflow and guides it back, extending the dispersion time; Intermediate section 9: The second inclined lifting plate 91 (130°~135° angle) and the horizontal lifting plate 92 (130°~135° angle) alternate to form a "lifting-flattening" cycle. At the same time, the dual-fluid nozzle 14 on the inner wall of the cylinder 1 sprays silicone oil to form an anti-sticking coating, reducing the wall adhesion rate. The ring plate 11 further obstructs and delays the flow. Discharge area lifting section 10: The third inclined lifting plate 101 (130°~135° bend angle) conveys materials.

[0056] The baffle 12 at the bottom inner side of the discharge end 3 intercepts the bottom overflow, forcing the material to rotate and rise with the cylinder 1 again and fall, extending the residence time in the discharge area and ensuring that the final moisture content meets the standard.

[0057] After drying, the material enters the collection device 7 through the discharge end 3. The stainless steel receiving parts and the stainless steel layer of the stirring shaft 13 are anti-stick and anti-corrosion, ensuring continuous and stable operation.

[0058] The implementation principle of this invention is based on "extending the material residence time and ensuring sufficient drying". The guiding structures in the guiding device 5 are all inclined towards the feed end 2. Through zone adaptation, synergistic blocking and anti-sticking temperature control, a multi-structure synergistic high-efficiency drying mechanism is constructed, as detailed below: First, the three zones of the lifting plate are all tilted towards the feed end 2 to extend the retention time in accordance with the drying process. The lifting plate section 8 in the feed zone uses the first inclined lifting plate 81 with a large bend angle to quickly disperse the high-moisture material and slow down the initial velocity; the lifting plate section 9 in the middle zone forms a "lifting-flattening" cycle by alternating with the horizontal lifting plate 92 and the second inclined lifting plate 91 to delay the movement; the lifting plate section 10 in the discharge zone uses the third inclined lifting plate 101 to stably convey the material and cooperates with the baffle 12 to intercept the overflow and extend the retention time before discharge.

[0059] Secondly, the circulation retention is enhanced. The ring plate 11 is inclined in the same direction as the lifting plate and at a larger angle, intercepting the material flowing towards the discharge end 3 and guiding it back to the lower lifting plate. It forms a "collecting-intercepting-falling-collecting" cycle with the three-zone lifting plate, avoiding the material from reaching the discharge end 3 directly before it is fully dried, and significantly extending the total retention time.

[0060] Thirdly, to prevent sticking and ensure retention, the stirring shaft 13 is wrapped with a stainless steel layer, and all contact parts are made of stainless steel. It is combined with the dual-fluid nozzle 14 on the cylinder wall to spray silicone oil, which reduces adhesion from a mechanical and chemical perspective, and avoids shortening the flow path and reducing the residence time due to adhesion.

[0061] Fourth, temperature control and support retention: The brush-type sealing structure 15 blocks heat loss inside the cylinder, maintains a stable drying environment, and provides a guarantee for the extended retention and full drying functions of each structure.

[0062] In summary, the rotary drum dryer of this invention ultimately achieves efficient material drying and stable equipment operation.

[0063] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A drum dryer, comprising a drum body (1), wherein the drum body (1) has a feed end (2) and a discharge end (3) at both ends, a crushing and stirring device (4) and a flow guiding device (5) are provided inside the drum body (1), an input device (6) is provided at the feed end (2), and a collection device (7) is provided at the discharge end (3), characterized in that, The flow guiding device (5) includes a feed zone lifting plate section (8), an intermediate zone lifting plate section (9), and a discharge zone lifting plate section (10) arranged sequentially from the feed end (2) to the discharge end (3); The feeding zone lifting plate section (8) includes multiple feeding zone lifting plate groups, and each feeding zone lifting plate group includes a first inclined lifting plate (81) circumferentially fixed to the inner wall of the cylinder (1); The intermediate zone lifting plate section (9) includes multiple intermediate zone lifting plate groups. Each intermediate zone lifting plate group includes a second inclined lifting plate (91) and a horizontal lifting plate (92) that are circumferentially fixed to the inner wall of the cylinder (1). The second inclined lifting plate (91) and the horizontal lifting plate (92) are arranged alternately. The discharge zone lifting plate section (10) includes a discharge zone lifting plate group, which includes multiple third inclined lifting plates (101) circumferentially fixed to the inner wall of the cylinder (1).

2. The drum dryer according to claim 1, characterized in that, Multiple inclined ring plates (11) are fixed circumferentially between adjacent feeding zone lifting plate groups, between adjacent intermediate zone lifting plate groups, and at the junction of adjacent feeding zone lifting plate groups and intermediate zone lifting plate groups.

3. The drum dryer according to claim 1, characterized in that, The first inclined lifting plate (81), the second inclined lifting plate (91), the third inclined lifting plate (101) and the horizontal lifting plate (92) are all folded plate-shaped.

4. The drum dryer according to claim 3, characterized in that, The included angle of the first inclined lifting plate (81) is greater than the included angle of the second inclined lifting plate (91), the third inclined lifting plate (101) and the horizontal lifting plate (92).

5. The drum dryer according to claim 1, characterized in that, A baffle (12) is provided at the end of the discharge end (3).

6. The drum dryer according to claim 1, characterized in that, The stirring shaft (13) in the crushing and stirring device (4) is covered with a stainless steel layer.

7. The drum dryer according to claim 1, characterized in that, The inner wall of the cylinder (1) is provided with multiple dual-fluid nozzles (14).

8. The drum dryer according to claim 1, characterized in that, Multiple brush-type sealing structures (15) are provided at the connection between the feed end (2) and the outlet end of the feeding device (6) and at the connection between the discharge end (3) and the inlet end of the collecting device (7). The brush seal structure (15) includes a sealing seat (151) and brush bristles (152) mounted on the sealing seat (151).

9. The drum dryer according to claim 1, characterized in that, The receiving components of the crushing and stirring device (4), the guiding device (5), the feeding device (6), and the collecting device (7) are all made of stainless steel.

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