Disc dryer

Abstract

The invention discloses a disc dryer, which belongs to the technical field of disc drying equipment, and comprises a shell, a driving shaft is rotatably arranged in the shell, a rake arm is fixedly arranged on the driving shaft, a rake blade is movably arranged on the rake arm, a driving mechanism is arranged on the rake arm, the rake blade is driven by the driving mechanism, and the angle of the rake blade relative to the rake arm is adjustable. The overturning direction and the overturning range of materials are controlled by adjusting the inclination angle of the rake blades, a drying disc is fixedly arranged in the shell, and the rake blades are located above the drying disc. And the driving mechanism comprises a driving motor, a driving screw rod, a driving block, a rack and a driving gear. The invention particularly provides a disc dryer which meets the drying requirements of materials with different water contents by controlling the material turning range and the drying time and can improve the material drying efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of drying equipment, in particular to a disc dryer. Background Art

[0002] The disc dryer is a kind of drying equipment mainly based on heat conduction, which is developed by integrating a series of advanced technologies and continuously improving on the basis of intermittent stirring conduction dryer. It is a kind of multi-layer fixed hollow heating circular drying disc, rotating rake stirring, vertical continuous drying equipment mainly based on heat conduction. The disc dryer is widely used in the fields of chemical industry, dye, pesticide, plastic, medicine and food.

[0003] The drying process of the disc dryer is to pass the heat carrier into each layer of hollow drying discs, indirectly heat the wet materials placed on the disc surface by heat conduction, and drive the rakes of the rakes to rotate through the rake arm, so that the moisture in the constantly moving and tumbling materials evaporates at the operating temperature, so as to continuously obtain qualified dried products at the bottom of the equipment. During the rotation of the rake arm, the rakes continuously turn the wet materials, while gradually pushing the wet materials from the inner edge of the small drying disc to the outer edge of the small drying disc in a spiral trajectory, and finally falling from the outer edge to the outer edge of the next layer of drying disc (large drying disc); the rakes on the large drying disc are in the opposite direction to those on the small drying disc, so the materials on the large drying disc are gradually pushed from the outer edge of the disc surface to the large drying disc in a spiral trajectory.

[0004] The position of the rake blades of the existing disc dryer is usually fixed relative to the rake arm. The time for the material to be dried and transferred on the small drying disc and the large drying disc is related to the rotation speed of the rake arm. At the same time, the rotation speed of the rake arm also determines the degree of the rake blade turning over the material. Therefore, it is difficult to control the drying time of materials with different moisture contents while ensuring that the rake arm rotation speed remains unchanged. In addition, due to the fixed position of the rake blades, during the rotation of the rake arm, the rake blades can only turn over the materials within a fixed range on the drying disc, resulting in limited material turning and drying effect. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a disc dryer to at least partially solve the problems raised in the above background technology.

[0006] The present invention provides the following technical solution: A disc dryer proposed by the present invention comprises a shell, a driving shaft is rotatably arranged in the shell, a rake arm is fixedly arranged on the driving shaft, rake blades are movably arranged on the rake arm, a driving mechanism is arranged on the rake arm, the rake blades are configured to be driven by the driving mechanism and have an adjustable angle relative to the rake arm, and the turning direction and turning range of the material are controlled by adjusting the inclination angle of the rake blades, a drying disc is fixedly arranged in the shell, and the rake blades are located above the drying disc; The driving mechanism includes a driving motor, a driving screw, a driving block, a rack and a driving gear. A mounting shell is provided below the rake arm, and a guide slot is provided on the inner bottom wall of the mounting shell. The driving motor is fixedly mounted on the side wall of the mounting shell, and the driving screw is connected to the output shaft of the driving motor. The driving block is connected to the driving screw through a thread, and the lower end of the driving block is engaged and slidably arranged in the guide slot. The rack is fixedly mounted on the driving block, and the driving gear is rotatably arranged on the mounting shell through a rotating shaft. The driving gear is meshed with the rack, and the rake blade is connected to the rotating shaft.

[0007] Furthermore, the drying plate comprises a small drying plate and a large drying plate, the small drying plate is located above the large drying plate, and a material discharge trough is provided at the outer circumference of the small drying plate and the center of the large drying plate.

[0008] Furthermore, an air flow channel is provided at the lower part of the driving shaft, the rake arm is a hollow structure, the rake arm and the air flow channel are connected via air holes, a drying air pipe is provided on the rake arm, and the drying air pipe is connected to the inside of the rake arm.

[0009] Furthermore, the drying plate is a hollow plate, and is connected to a hot air inlet pipe and a hot air outlet pipe, and the hot air inlet pipe and the hot air outlet pipe are symmetrically arranged along the radial direction of the drying plate, the hot air inlet pipe is externally connected to a high-temperature heat pump, and the hot air outlet pipe is externally connected to an air pump, and a hot air circulation pipe is provided on the outlet of the air pump, the free end of the hot air circulation pipe extends into the air flow channel, and the drive shaft is rotatably arranged relative to the hot air circulation pipe.

[0010] Furthermore, a feed channel is provided on the upper portion of the driving shaft, a feed port is provided on the side wall of the feed channel, and a feed pipe is connected to the upper end of the driving shaft, and the feed pipe is rotatably connected to the driving shaft.

[0011] Furthermore, the feed port and the rake arm are staggered, and the staggered setting prevents the material added through the feed port from falling onto the rake arm.

[0012] Furthermore, a protective shell is fixedly provided on the shell body, the feeding pipe is fixedly provided on the protective shell, a rotating motor is fixedly provided on the protective shell, a driving gear is fixedly provided on the output shaft of the rotating motor, a driven gear is fixedly provided on the driving shaft, and the driving gear and the driven gear are meshed.

[0013] Furthermore, a discharge port is provided on the bottom wall of the shell, and a blocking mechanism is provided on the bottom wall of the shell. The blocking mechanism is connected to the driving shaft and is driven by the driving shaft to control the opening and closing state of the discharge port.

[0014] Furthermore, the blocking mechanism includes an incomplete gear, a blocking gear, a transmission shaft and a blocking shaft, the incomplete gear is fixed on the driving shaft, the transmission shaft is rotatably provided on the bottom wall of the shell, the blocking gear is fixed on the transmission shaft, the incomplete gear and the blocking gear are intermittently meshed, the blocking shaft is rotatably provided on the bottom wall of the shell, the transmission shaft and the blocking shaft are correspondingly fixed with synchronous sprockets, the synchronous sprockets are sleeved with a synchronous chain, a blocking plate is fixed on the blocking shaft, the blocking plate is fitted against the bottom wall of the shell and rotates around the blocking shaft, a fan-shaped discharge trough is provided on the sealing plate, and the size of the discharge trough corresponding to the discharge port is not smaller than the discharge port.

[0015] Furthermore, a scraper is provided at the lower portion of the driving shaft, and the scraper is in contact with the inner bottom wall of the shell.

[0016] The beneficial effects achieved by the present invention using the above structure are as follows: By setting up a rake blade structure with adjustable angle, the material turning range and drying time can be controlled. The material drying efficiency is effectively improved by controlling the turning range, and the drying time is controlled so that the disc dryer provided by this solution can better meet the drying requirements of materials with different moisture contents. The reuse of the hot air flow in the drying disc is achieved by setting up an air pump and a hot air circulation pipe. At the same time, the dry gas ejected from the drying air pipe cooperates with the heat conduction of the drying disc to dry the material, thereby improving the material drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 Schematic diagram of a three-dimensional cross-sectional structure of an embodiment of the present invention Figure 1 ; Figure 3 for Figure 2 A partial enlarged view of part A; Figure 4 for Figure 2 A partial enlarged view of part B; Figure 5 Schematic diagram of a three-dimensional cross-sectional structure of an embodiment of the present invention Figure 2 ; Figure 6 for Figure 5 A partial enlarged view of part C; Figure 7 Schematic diagram of a three-dimensional cross-sectional structure of an embodiment of the present invention Figure 3 ; Figure 8It is a schematic diagram of a top view and cross-section structure of a small drying plate according to an embodiment of the present invention; Fig. 9 This is a schematic diagram of the structure of an embodiment of the present invention when viewed from above; Fig.10 Schematic diagram of the driving structure of the blocking plate according to an embodiment of the present invention.

[0017] Among them, 1. shell, 2. drive shaft, 3. rake arm, 4. rake blade, 5. drive motor, 6. drive screw, 7. drive block, 8. rack, 9. drive gear, 10. mounting shell, 11. guide slide, 12. small drying plate, 13. large drying plate, 14. unloading chute, 15. air flow channel, 16. air hole, 17. drying air pipe, 18. hot air inlet pipe, 19. hot air outlet pipe, 20. high temperature heat pump, 21. air pump, 22. hot air circulation pipe, 23. feed channel, 24. feed port, 25. feeding pipe, 26. protective shell, 27. rotating motor, 28. driving gear, 29. driven gear, 30. discharge port, 31. incomplete gear, 32. blocking gear, 33. transmission shaft, 34. blocking shaft, 35. synchronous chain, 36. blocking plate, 37. discharge chute, 38. scraper. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0020] This embodiment is an improvement made to address the technical problem that the raking position of the existing disc dryer is usually fixed, resulting in the inability to control the material turning position and drying time according to the specific moisture content of the material.

[0021] See also Figure 1-Figure 3 , Figure 5 and Figure 7The present embodiment provides a disc dryer, comprising a housing 1, a driving shaft 2 is rotatably provided in the housing 1, a rake arm 3 is fixedly provided on the driving shaft 2, a rake blade 4 is movably provided on the rake arm 3, a driving mechanism is provided on the rake arm 3, the rake blade 4 is configured to be driven by the driving mechanism and the angle relative to the rake arm 3 is adjustable, and the turning direction and turning range of the material are controlled by adjusting the inclination angle of the rake blade 4, a drying disc is fixedly provided in the housing 1, and the rake blade 4 is located above the drying disc, when working, when the rake blade 4 is adjusted to a vertical state, the rake blade 4 only turns and dries the material, and when the rake blade 4 is adjusted to an inclined state, the rake blade 4 pushes the material in the direction of the inclination of the lower end of the rake blade 4 while turning the dry material, so as to complete the transfer of the material between the drying discs; in the process of the rake blade 4 rotating with the rake arm 3, the pushing direction of the material can be adjusted by continuously changing the inclination direction of the rake blade 4 to control the residence drying time of the material on the drying disc; The driving mechanism includes a driving motor 5, a driving screw 6, a driving block 7, a rack 8 and a driving gear 9. A mounting shell 10 is provided below the rake arm 3. A guide slot 11 is provided on the inner bottom wall of the mounting shell 10. The driving motor 5 is fixedly arranged on the side wall of the mounting shell 10. The driving screw 6 is connected to the output shaft of the driving motor 5. The driving block 7 is connected to the driving screw 6 through a thread. The lower end of the driving block 7 is engaged and slidably arranged in the guide slot 11. The driving screw 6 is used to drive the driving block 7 to move. The guide slot 11 is used to guide the movement of the driving block 7. The rack 8 is fixedly arranged on the driving block 7. The driving gear 9 is rotatably arranged on the mounting shell 10 through a rotating shaft. The driving gear 9 is meshed with the rack 8, and the rake blade 4 is connected to the rotating shaft.

[0022] It should be noted that multiple groups of rake blades 4 are arranged on the rake arm 3, and multiple groups of rotating shafts and driving gears 9 are arranged corresponding to the rake blades 4. A U-shaped groove is opened at the upper end of the rake blade 4, and the upper end of the rake blade 4 is connected to the rotating shaft. The setting of the U-shaped groove can meet the swinging space requirement of the rake blade 4 on the rake arm 3. When the rack 8 moves, the engagement between the rack 8 and the driving gear 9 drives the rotating shaft to rotate, thereby driving the rake blade 4 to swing, and the angle of the rake blade 4 is adjusted.

[0023] Specifically, see Figure 2 , Figure 5 and Figure 7 In this embodiment, the drying plate includes a small drying plate 12 and a large drying plate 13. The small drying plate 12 is located above the large drying plate 13. A material discharge trough 14 is provided at the outer circumference of the small drying plate 12 and the center of the large drying plate 13. The material discharge trough 14 is provided to realize the transfer of materials between the drying plates.

[0024] It should be noted that the rakes 4 shown in the drawings of this embodiment are only schematic diagrams, and the rakes 4 of the actual production equipment are arranged at a high density to ensure that the materials are pushed and moved radially on the small drying plate 12 and the large drying plate 13.

[0025] At the same time, in order to ensure the material drying effect, multiple groups of drying discs are arranged in the housing 1.

[0026] Specifically, see Figure 5 and Figure 6 In this embodiment, an air flow channel 15 is opened at the lower part of the driving shaft 2, the rake arm 3 is a hollow structure, the rake arm 3 and the air flow channel 15 are connected through an air hole 16, and a drying air pipe 17 is provided on the rake arm 3. The drying air pipe 17 is connected to the inside of the rake arm 3. Under the action of the drying air pipe 17, high-temperature gas is sprayed toward the material to dry the material.

[0027] Specifically, see Figure 1 , Figure 7 and Figure 8 In this embodiment, the drying plate is a hollow plate, and a hot air inlet pipe 18 and a hot air outlet pipe 19 are connected to the drying plate. The hot air inlet pipe 18 and the hot air outlet pipe 19 are symmetrically arranged along the radial direction of the drying plate. The hot air inlet pipe 18 is externally connected to a high-temperature heat pump 20, and high-temperature gas is introduced into the drying plate through the high-temperature heat pump 20. The material on the drying plate is dried under the action of heat conduction. The hot air outlet pipe 19 is externally connected to an air pump 21. A hot air circulation pipe 22 is arranged at the outlet of the air pump 21. The free end of the hot air circulation pipe 22 extends into the air flow channel 15, and the drive shaft 2 is rotatably arranged relative to the hot air circulation pipe 22. When working, the high-temperature gas in the drying plate is extracted under the action of the air pump 21, and is input into the air flow channel 15 through the hot air circulation pipe 22. The hot air is discharged through the dry air pipe 17 to further dry the material on the drying plate.

[0028] It should be noted that an exhaust pipe is also required to be provided on the shell 1, and the exhaust pipe is externally connected to an exhaust pump 21. The high-temperature hot and humid gas in the shell 1 is extracted through the exhaust pump 21 and the exhaust pipe to ensure a dry environment in the shell 1. The exhaust pump 21 and the exhaust pipe are both existing technologies and are not shown in the drawings of this embodiment. In order to save energy, the hot and humid gas extracted by the exhaust pump 21 can be dried and reused.

[0029] Specifically, see Figure 7 In this embodiment, a feed channel 23 is opened on the upper part of the driving shaft 2, a feed port 24 is opened on the side wall of the feed channel 23, a feeding pipe 25 is connected to the upper end of the driving shaft 2, and the feeding pipe 25 is rotatably connected to the driving shaft 2; the feed port 24 and the rake arm 3 are staggered, and the staggered setting prevents the material added through the feed port 24 from falling on the rake arm 3.

[0030] During operation, the feeding pipe 25 is fixed relative to the shell 1, and the driving shaft 2 is rotatably arranged relative to the shell 1 and the feeding pipe 25. During the rotation of the driving shaft 2, the centrifugal force is utilized to throw the material to be dried added by the feeding pipe 25 through the feed port 24 to a group of small drying plates 12 on the top layer to complete the material loading, and under the action of the centrifugal force, the uniformity of the material added to the small drying plates 12 can be ensured as much as possible.

[0031] Specifically, see Figure 6 In this embodiment, a protective shell 26 is fixedly provided on the shell body 1, a feeding pipe 25 is fixedly provided on the protective shell 26, a rotating motor 27 is fixedly provided on the protective shell 26, a driving gear 28 is fixedly provided on the output shaft of the rotating motor 27, a driven gear 29 is fixedly provided on the driving shaft 2, the driving gear 28 and the driven gear 29 are meshed, and the driving shaft 2 is driven to rotate under the meshing action of the driving gear 28 and the driven gear 29. When the driving shaft 2 rotates, centrifugal force is utilized to realize uniform feeding of materials, and the rake arm 3 drives the rake blade 4 to turn the materials.

[0032] Specifically, see Figure 4 , Fig. 9 and Fig.10 In this embodiment, a discharge port 30 is provided on the bottom wall of the shell 1, and a blocking mechanism is provided on the bottom wall of the shell 1. The blocking mechanism is connected to the drive shaft 2, and the blocking mechanism is driven by the drive shaft 2 to control the opening and closing state of the discharge port 30; the blocking mechanism includes an incomplete gear 31, a blocking gear 32, a transmission shaft 33 and a blocking shaft 34, the incomplete gear 31 is fixedly arranged on the drive shaft 2, the transmission shaft 33 is rotatably arranged on the bottom wall of the shell 1, and the blocking gear 32 is fixedly arranged on the transmission shaft 33 On the upper part, the incomplete gear 31 and the blocking gear 32 are intermittently meshed, the blocking shaft 34 is rotatably arranged on the bottom wall of the shell 1, and synchronous sprockets are correspondingly fixed on the transmission shaft 33 and the blocking shaft 34, and a synchronous chain 35 is sleeved on the synchronous sprocket. A blocking plate 36 is fixed on the blocking shaft 34, and the blocking plate 36 is fitted against the bottom wall of the shell 1 and rotates around the blocking shaft 34. A fan-shaped discharge groove 37 is opened on the sealing plate 36, and the size of the discharge groove 37 corresponding to the discharge port 30 is not less than the discharge port 30.

[0033] During operation, the driving shaft 2 drives the incomplete gear 31 to rotate one circle for each rotation. When the incomplete gear 31 is meshed with the blocking gear 32, the blocking gear 32 is driven to rotate an arc angle corresponding to the angle of the sawtooth setting on the incomplete gear 31. Under the cooperation of the synchronous chain 35 and the synchronous sprocket, the blocking shaft 34 is driven to rotate a corresponding arc angle. Through this structure, during the process of the driving shaft 2 rotating n circles, the blocking plate 36 always blocks the discharge port 30. During this process, the shell 1 is always in a closed and dry state. When the driving shaft 2 rotates n+1 circles, the discharge slot 37 of the blocking plate 36 rotates to the position corresponding to the discharge port 30, completing the discharge of the dried material in the shell 1.

[0034] Specifically, see Figure 2 and Figure 7 In this embodiment, a scraper 38 is provided at the lower part of the driving shaft 2, and the scraper 38 is in contact with the inner bottom wall of the shell 1. Under the action of the scraper 38, the dried material on the bottom wall of the shell 1 can be pushed out.

[0035] The working principle of the disc dryer provided in this embodiment is as follows: (1) The rotating motor 27 is started, and the rotating motor 27 drives the driving gear 28 to rotate. The driving gear 28 and the driven gear 29 are meshed to drive the driving shaft 2 to rotate.

[0036] The material is added into the feed channel 23 of the drive shaft 2 through the feed pipe 25. During the rotation of the drive shaft 2, the material in the material feed channel 23 is dispersed onto the uppermost group of small drying plates 12 from the feed port 24 under the action of centrifugal force.

[0037] (2) High-temperature hot air is introduced into the drying plate by the action of the high-temperature heat pump 20, and the material on the drying plate is dried by heat conduction. The high-temperature hot air in the drying plate is sucked out by the action of the air pump 21, and the high-temperature hot air enters the air flow channel 15 along the hot air circulation pipe 22, and dries the material on the drying plate along the air flow channel 15, the air holes 16 and the drying air pipe 17.

[0038] During the rotation of the driving shaft 2, the rake arms 3 drive the rake blades 4 to turn the materials on the drying plate, and the heat conduction of the drying plate and the hot air of the drying air pipe 17 are combined to dry the materials.

[0039] (3) Start the driving motor 5, which drives the driving screw 6 to rotate. Under the driving action of the driving screw 6 and the guiding limit of the guide slot 11, the driving block 7 is driven to move. When the driving block 7 moves, it drives the rack 8 to move. The moving rack 8 meshes with the driving gear 9, driving the driving gear 9 and the rotating shaft to rotate. When the rotating shaft rotates, the inclination angle of the rake blade 4 is adjusted. In the process of adjusting the inclination angle of the rake blade 4, the flipping coverage area of ​​the rake blade 4 is adjusted, thereby improving the drying efficiency of the material on the drying plate.

[0040] When the lower end of the rake blade 4 is toward the side wall of the shell 1, the rake blade 4 turns the material and gradually pushes the material from the inner edge of the drying plate to the outer edge of the drying plate in a spiral trajectory; when the lower end of the rake blade 4 is toward the axial direction of the shell 1, the rake blade 4 turns the material and gradually pushes the material from the outer edge of the drying plate to the inner edge of the drying plate in a spiral trajectory; in this process, the material is transferred between the drying plates by the setting of the feed chute 14, and the drying time of the material on each drying plate can be extended by exchanging and adjusting the direction of the lower end of the rake blade 4 to meet the drying requirements of materials with different moisture contents.

[0041] (4) The dried material falls onto the bottom wall of the shell 1, and during the rotation of the drive shaft 2, the blocking gear 32 is driven to rotate by the incomplete gear 31, and the blocking gear 32 drives the transmission shaft 33 to rotate, and the blocking shaft 34 is driven to rotate under the cooperation of the synchronous chain 35 and the synchronous sprocket, and the blocking shaft 34 drives the blocking plate 36 to rotate, and the relative position of the discharge trough 37 and the discharge port 30 is adjusted. The discharge trough 37 of the blocking plate 36 rotates to the corresponding position of the discharge port 30, and the discharge of the dried material in the shell 1 is completed; and when the blocking plate 36 is in a state of blocking the discharge port 30, the shell 1 is in a closed and dry state, providing conditions for material drying.

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, material or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, material or apparatus.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A disc dryer, characterized in that: The invention comprises a housing (1), a driving shaft (2) rotatably provided in the housing (1), a rake arm (3) fixedly provided on the driving shaft (2), rake blades (4) movably provided on the rake arm (3), a driving mechanism provided on the rake arm (3), the rake blades (4) being configured to be driven by the driving mechanism and having an adjustable angle relative to the rake arm (3), a drying plate fixedly provided in the housing (1), and the rake blades (4) being located above the drying plate; The driving mechanism comprises a driving motor (5), a driving screw (6), a driving block (7), a rack (8) and a driving gear (9); a mounting shell (10) is provided below the rake arm (3); a guide slot (11) is provided on the inner bottom wall of the mounting shell (10); the driving motor (5) is fixedly mounted on the side wall of the mounting shell (10); the driving screw (6) is connected to the output shaft of the driving motor (5); the driving block (7) is connected to the driving screw (6) via a thread; the lower end of the driving block (7) is slidably engaged in the guide slot (11); the rack (8) is fixedly mounted on the driving block (7); the driving gear (9) is rotatably mounted on the mounting shell (10) via a rotating shaft; the driving gear (9) is meshed with the rack (8); and the rake blade (4) is connected to the rotating shaft.

2. The disc dryer according to claim 1, characterized in that: The drying plate comprises a small drying plate (12) and a large drying plate (13), wherein the small drying plate (12) is located above the large drying plate (13), and a material discharge trough (14) is provided at the outer circumference of the small drying plate (12) and the center of the large drying plate (13).

3. The disc dryer according to claim 2, characterized in that: An air flow channel (15) is provided at the lower part of the driving shaft (2); the rake arm (3) is a hollow structure; the rake arm (3) and the air flow channel (15) are connected via an air hole (16); a drying air pipe (17) is provided on the rake arm (3); and the drying air pipe (17) is communicated with the interior of the rake arm (3).

4. The disc dryer according to claim 3, characterized in that: The drying plate is a hollow plate. A hot air inlet pipe (18) and a hot air outlet pipe (19) are connected to the drying plate. The hot air inlet pipe (18) and the hot air outlet pipe (19) are symmetrically arranged along the radial direction of the drying plate. The hot air inlet pipe (18) is externally connected to a high-temperature heat pump (20). The hot air outlet pipe (19) is externally connected to an air pump (21). A hot air circulation pipe (22) is arranged at the outlet of the air pump (21). The free end of the hot air circulation pipe (22) extends into the air flow channel (15). The drive shaft (2) is rotatably arranged relative to the hot air circulation pipe (22).

5. The disc dryer according to claim 1, characterized in that: A feed channel (23) is provided on the upper portion of the drive shaft (2), a feed port (24) is provided on the side wall of the feed channel (23), and a feed pipe (25) is connected to the upper end of the drive shaft (2), and the feed pipe (25) is rotatably connected to the drive shaft (2).

6. The disc dryer according to claim 5, characterized in that The feed port (24) and the rake arm (3) are arranged in a staggered manner, and the staggered arrangement prevents materials added through the feed port (24) from falling onto the rake arm (3).

7. The disc dryer according to claim 6, characterized in that A protective shell (26) is fixedly provided on the housing (1), the feeding pipe (25) is fixedly provided on the protective shell (26), a rotating motor (27) is fixedly provided on the protective shell (26), a driving gear (28) is fixedly provided on the output shaft of the rotating motor (27), a driven gear (29) is fixedly provided on the driving shaft (2), and the driving gear (28) and the driven gear (29) are meshed.

8. The disc dryer according to claim 1, characterized in that: A discharge port (30) is provided on the bottom wall of the shell (1), and a blocking mechanism is provided on the bottom wall of the shell (1), the blocking mechanism is connected to the drive shaft (2), and the blocking mechanism is driven by the drive shaft (2) to control the opening and closing state of the discharge port (30).

9. The disc dryer according to claim 8, characterized in that The blocking mechanism comprises an incomplete gear (31), a blocking gear (32), a transmission shaft (33) and a blocking shaft (34); the incomplete gear (31) is fixedly arranged on the drive shaft (2); the transmission shaft (33) is rotatably arranged on the bottom wall of the housing (1); the blocking gear (32) is fixedly arranged on the transmission shaft (33); the incomplete gear (31) and the blocking gear (32) are intermittently meshed; and the blocking shaft (34) is rotatably arranged on the bottom wall of the housing (1). The transmission shaft (33) and the blocking shaft (34) are correspondingly fixedly provided with synchronous sprockets, the synchronous sprockets are sleeved with a synchronous chain (35), a blocking plate (36) is fixedly provided on the blocking shaft (34), the blocking plate (36) is in contact with the bottom wall of the shell (1) and rotates around the blocking shaft (34), and a fan-shaped discharge groove (37) is formed on the sealing plate (36), and the size of the corresponding portion of the discharge groove (37) and the discharge port (30) is not smaller than the discharge port (30).

10. The disk dryer according to claim 9, characterized in that A scraper (38) is provided at the lower part of the driving shaft (2), and the scraper (38) is in contact with the inner bottom wall of the housing (1).

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