A disc dryer

Abstract

This utility model discloses a disc dryer, which includes a cylinder and a support frame. A first motor is fixedly connected to the top of the cylinder, and a spiral stirring rod is fixedly connected to the output end of the first motor. A metering hopper is provided outside the spiral stirring rod, and two symmetrically arranged arc-shaped baffles are rotatably connected to the outside of the metering hopper. An exhaust valve is provided at the outlet of the air tank, and the outlet of the exhaust valve is fixedly connected to a rotary joint through an air pipe. The port of the rotary joint is rotatably connected to a shaft. Multiple sets of vertically distributed air inlets are provided on the outside of the shaft. Through the above structure, the metering hopper and the two rotatable arc-shaped baffles can achieve precise control of material feeding, avoiding excessive feeding that would affect the drying effect. In addition, the multiple sets of vertically distributed air inlets on the outside of the shaft, combined with the air tank, exhaust valve, and rotary joint, form an airflow conveying system. After the material is dried, residual material can be swept away with a rake.

Description

Technical Field

[0001] This utility model relates to the field of dryer technology, and in particular to a disc dryer. Background Technology

[0002] In industrial production, drying equipment, as a key link in the material processing flow, is widely used in industries such as chemical, food, and pharmaceutical. Its core function is to rapidly evaporate moisture from materials through heat transfer to meet subsequent processing or storage needs. Currently, the mainstream drying equipment on the market includes drum dryers, fluidized bed dryers, and traditional disc dryers. However, these devices still have some problems in practical applications and are difficult to adapt to the high-precision and high-efficiency production requirements.

[0003] From the perspective of material feeding, traditional drying equipment mostly adopts open feed inlets or simple funnel-type feeding structures, lacking a precise quantity control mechanism. When processing materials that are prone to caking or have poor flowability, the amount of material fed in can easily fluctuate. If too much material is fed in at once, it will cause the material to accumulate too thickly in the drying chamber, which will not only block the heat-conducting elements, reduce heat transfer efficiency, and prolong the drying cycle, but may also lead to over-drying or under-drying due to uneven heating of local materials, seriously affecting product quality.

[0004] Regarding the removal of residues after material drying, traditional disc dryers typically rely on an inclined structure at the bottom of the drying chamber or a simple scraper device to discharge the material. However, because materials easily adhere to the inner wall of the drying chamber, the surface of the discs, and the stirring components due to heat during the drying process, it is difficult to completely remove the residues by simply relying on gravity or mechanical scraping. These residues not only occupy the effective space of the drying chamber, affecting the drying effect of subsequent batches of materials, but may also deteriorate, carbonize, or even contaminate the next batch of materials due to prolonged heat retention, posing a significant threat to the continuity and safety of the production process.

[0005] In summary, current drying equipment has problems in terms of precise material control, efficient cleaning of residual materials, and coordinated adaptation of airflow systems. Therefore, a new type of drying equipment that can solve these problems is needed to meet the industrial production demand for efficient, precise, and clean drying. Utility Model Content

[0006] The purpose of this invention is to provide a disc dryer to solve the problems mentioned in the background art.

[0007] This utility model also provides a disc dryer as described above, comprising: a cylinder and a support frame, the support frame including a first plate and a second plate, the first plate being fixedly connected to the second plate via a connecting plate, the interior of the second plate being fixedly connected to the cylinder, an overlapping plate being fixedly connected to the interior of the cylinder, and multiple discs of different radii being fixedly connected to the exterior of the overlapping plate, the interiors of the multiple discs being filled with heat-conducting oil; a first motor being fixedly connected to the top of the cylinder, a spiral stirring rod being fixedly connected to the output end of the first motor, and a metering hopper being provided on the exterior of the spiral stirring rod. The metering hopper is externally rotatably connected to two symmetrically arranged arc-shaped baffles; the bottom of the cylinder is fixedly connected to a second motor, the output end of the second motor is fixedly connected to a shaft, the shaft is externally fixedly connected to an arm, and the lower surface of the arm is fixedly connected to multiple rake plates; the upper surface of the second plate is fixedly connected to a gas storage tank, the outlet of the gas storage tank is provided with an exhaust valve, the outlet of the exhaust valve is fixedly connected to a rotary joint through an air pipe, the port of the rotary joint is rotatably connected to the shaft, and the outside of the shaft is provided with multiple sets of vertically distributed air inlets from top to bottom.

[0008] Preferably, an electric push rod is rotatably connected to the outside of the metering hopper, and a movable block is fixedly connected to the output end of the electric push rod. The outside of the movable block is rotatably connected to an arc-shaped baffle.

[0009] Preferably, the lower surface of the plurality of discs is provided with a plurality of heating wires, and the plurality of heating wires are used in conjunction with the heat-conducting oil.

[0010] Preferably, a dust collector is fixedly connected inside the second plate, and the dust collector is fixedly connected to the exhaust port of the cylinder through a first pipe.

[0011] Preferably, the outlet of the dust collector is fixedly connected to an induced draft fan via a second pipe, and the induced draft fan is fixedly installed on the second plate.

[0012] Preferably, the top of the metering hopper is fixedly connected to the cylinder, and the top of the cylinder is provided with a discharge port.

[0013] Preferably, the plurality of disks are arranged alternately along the vertical direction on the outside of the shaft, and the inside of the shaft has an air conveying channel.

[0014] Preferably, a spring-loaded miniature one-way valve is installed inside the air inlet.

[0015] Preferably, a barometer is provided at the top of the cylinder, and the detection probe of the barometer penetrates the cylinder and extends into the interior.

[0016] Preferably, a discharge pipe is provided at the bottom of the cylinder, and a discharge valve is provided on the discharge pipe.

[0017] Compared with the prior art, the beneficial effects of this utility model are: the quantitative hopper, in combination with two rotatable and combinable arc-shaped baffles, can accurately control the amount of material fed into the cylinder, effectively avoiding the problems of material accumulation on the disc and uneven heating due to excessive feeding, or equipment waste due to insufficient feeding, ensuring that the material is always in a suitable drying state, and improving the uniformity and quality stability of the dried material.

[0018] The airflow conveying system, consisting of multiple air inlets on the outside of the shaft, an air tank, an exhaust valve, and a rotary joint, can work with the rake plate to blow away residual materials inside the cylinder and on the disc after the material has dried. This eliminates the need for manual disassembly of the equipment for cleaning, reducing cleaning time and labor costs, preventing residual materials from affecting the processing of the next batch of materials, and reducing the risk of equipment component damage caused by manual cleaning. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0020] Figure 1 This is a complete structural diagram of the disc dryer of this utility model;

[0021] Figure 2 This is a side view of the disc dryer of this utility model.

[0022] Figure 3 This is a cross-sectional structural diagram of the disc dryer of this utility model;

[0023] Figure 4 This is a structural diagram of the support frame for the disc dryer of this utility model;

[0024] Figure 5 This is a structural diagram of the quantitative mechanism of the disc dryer of this utility model;

[0025] Figure 6 This is a structural diagram of the drying and cleaning mechanism of the disc dryer of this utility model;

[0026] Figure 7 This utility model relates to a disc dryer. Figure 2 Partial structural diagram at point A in the middle;

[0027] Figure 8 This utility model relates to a disc dryer. Figure 6 Partial structural diagram at point B in the middle.

[0028] Legend:

[0029] 1. Cylinder; 101. Discharge port; 102. Discharge pipe; 103. Unloading valve; 2. Support; 201. First plate; 202. Second plate; 203. Connecting plate; 3. Overlapping plate; 4. Disc; 5. Heat transfer oil; 6. First motor; 7. Screw stirring rod; 8. Metering hopper; 9. Arc-shaped baffle; 10. Second motor; 11. Shaft; 12. Arm; 13. Rake plate; 14. Air tank; 15. Exhaust valve; 16. Air pipe; 17. Rotary joint; 18. Air inlet; 181. Spring-loaded miniature one-way valve; 19. Electric push rod; 20. Movable block; 21. Heating wire; 22. Dust collector; 23. First pipe; 24. Second pipe; 25. Exhaust fan; 26. Barometer. Detailed Implementation

[0030] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0031] The present invention will be further described in detail below with reference to embodiments:

[0032] Example 1

[0033] like Figure 1-8 As shown in the figure, an embodiment of the present invention provides a disc dryer, which includes: a cylinder 1 and a support 2. The support 2 includes a first plate 201 and a second plate 202. The first plate 201 is fixedly connected to the second plate 202 via a connecting plate 203. The interior of the second plate 202 is fixedly connected to the cylinder 1. An overlapping plate 3 is fixedly connected to the interior of the cylinder 1. Multiple discs 4 of different radii are fixedly connected to the exterior of the overlapping plate 3. The interiors of the multiple discs 4 are filled with heat-conducting oil 5. A first motor 6 is fixedly connected to the top of the cylinder 1. A spiral stirring rod 7 is fixedly connected to the output end of the first motor 6. A metering hopper 8 is provided on the exterior of the spiral stirring rod 7. Two symmetrically arranged arc-shaped baffles 9 are rotatably connected to the outside of the measuring hopper 8; a second motor 10 is fixedly connected to the bottom of the cylinder 1, a shaft 11 is fixedly connected to the output end of the second motor 10, an arm 12 is fixedly connected to the outside of the shaft 11, and multiple rake plates 13 are fixedly connected to the lower surface of the arm 12; an air storage tank 14 is fixedly connected to the upper surface of the second plate 202, an exhaust valve 15 is provided at the outlet of the air storage tank 14, and a rotary joint 17 is fixedly connected to the outlet of the exhaust valve 15 through an air pipe 16. The port of the rotary joint 17 is rotatably connected to the shaft 11, and multiple sets of vertically distributed air inlets 18 from top to bottom are provided on the outside of the shaft 11;

[0034] An electric push rod 19 is rotatably connected to the outside of the metering hopper 8. A movable block 20 is fixedly connected to the output end of the electric push rod 19. The outside of the movable block 20 is rotatably connected to the arc-shaped baffle 9. Multiple sets of heating wires 21 are provided on the lower surface of multiple discs 4. The multiple sets of heating wires 21 are used in conjunction with the heat transfer oil 5. A dust collector 22 is fixedly connected inside the second plate 202. The dust collector 22 is fixedly connected to the exhaust port of the cylinder 1 through the first pipe 23. The outlet of the dust collector 22 is fixedly connected to an induced draft fan 25 through the second pipe 24. It is fixedly installed on the second plate 202; the top of the metering hopper 8 is fixedly connected to the cylinder 1, and the top of the cylinder 1 is provided with a discharge port 101; multiple discs 4 are arranged alternately in the vertical direction on the outside of the shaft 11, and the inside of the shaft 11 has an air supply channel; the inside of the air injection port 18 is provided with a spring-type miniature one-way valve 181; the top of the cylinder 1 is provided with a barometer 26, and the detection probe of the barometer 26 penetrates the cylinder 1 and extends into the inside; the bottom of the cylinder 1 is provided with a discharge pipe 102, and a discharge valve 103 is provided on the discharge pipe 102.

[0035] In this embodiment, the material enters the metering hopper 8 from the top discharge port 101 of the cylinder 1. The electric push rod 19 drives the movable block 20 to rotate the arc-shaped baffle 9, controlling the metering hopper 8 to uniformly feed the material into the cylinder 1. The spiral stirring rod 7 assists in the initial dispersion of the material, which then falls onto the disc 4 for drying. The heat-conducting oil 5 in the disc 4 works in conjunction with the heating wire 21 below to transfer heat to the surrounding material through the staggered distribution of the discs 4. At the same time, the second motor 10 drives the shaft 11 to rotate the arm 12 and the rake plate 13, turning the material so that it can fully contact the hot disc 4, thereby achieving efficient drying. When it is necessary to clean the residual material on the disc 4, the exhaust valve 15 is opened, so that the gas in the gas storage tank 14 is transported through the air pipe 16, and then sprayed out from multiple air inlets 18 through the internal air supply channel of the shaft 11. The spring-type miniature one-way valve 181 prevents the material from flowing back, forming a three-dimensional airflow. The barometer 26 at the top of the cylinder 1 monitors the internal air pressure in real time. The dust-laden exhaust gas generated during drying enters the first pipe 23 through the exhaust port of the cylinder 1, is filtered and purified by the dust collector 22, and is then drawn out and discharged by the induced draft fan 25 through the second pipe 24.

[0036] Example 2

[0037] like Figure 1-8 As shown in the figure, an embodiment of the present invention provides a disc dryer, which includes a cylinder 1 and a support 2. Material enters a fixedly connected quantitative hopper 8 from the discharge port 101 at the top of the cylinder 1. The electric push rod 19 is activated, driving the movable block 20 to rotate the arc-shaped baffle 9, precisely controlling the amount of material fed into the quantitative hopper 8, and achieving uniform feeding into the cylinder 1. At the same time, the first motor 6 drives the spiral stirring rod 7 to operate, initially dispersing the fed material to prevent material from clumping. Subsequently, the dispersed material falls onto the staggered discs 4.

[0038] Multiple sets of heating wires 21 on the lower surface of the disc 4 generate heat, which, in conjunction with the heat-conducting oil 5 filling the inside of the disc 4, evenly transfers heat to the material falling onto the disc 4. At the same time, the second motor 10 drives the shaft 11 to rotate, and the shaft 11 drives the external arm 12 and multiple rake plates 13 on the lower surface of the arm 12 to rotate synchronously, continuously turning the material, so that the material is in full contact with the heated disc 4, improving the uniformity of heating. If it is necessary to clean the material remaining on the surface of the disc 4, there is no need to disassemble the equipment. The exhaust valve 15 at the outlet of the air tank 14 can be opened, and the gas enters the rotary joint 17 through the air pipe 16, and then is sprayed out from the multiple sets of air injection ports 18 distributed from top to bottom on the outside of the shaft 11 through the air supply channel inside the shaft 11, forming a three-dimensional airflow, which further accelerates the drying of the material. Among them, the spring-type miniature one-way valve 181 in the air injection port 18 can prevent the material from flowing back into the air supply channel. During this period, the pressure gauge 26 at the top of the cylinder 1 monitors the internal air pressure in real time to ensure safe operation. At the same time, the rake plate 13 is kept rotating, and the airflow, in conjunction with the rake plate 13, can sweep the residual material to the bottom of the cylinder 1 for easy subsequent discharge.

[0039] The dust-laden exhaust gas generated during the drying process enters the first pipe 23 through the exhaust port of the cylinder 1 and is transported to the dust collector 22 fixed inside the second plate 202 for filtration and purification to remove dust and impurities from the exhaust gas. The purified exhaust gas is then extracted by the induced draft fan 25 fixed on the second plate 202 through the second pipe 24 and finally discharged from the equipment to avoid environmental pollution. After the material is dried, the discharge valve 103 on the discharge pipe 102 at the bottom of the cylinder 1 is opened, and the dried material is discharged from the discharge pipe 102, completing a complete drying operation.

[0040] Example 3

[0041] like Figure 1-8 As shown in the figure, in a disc dryer according to an embodiment of the present invention, the material is first conveyed to the discharge port 101 at the top of the cylinder 1 through an external feeding device. The discharge port 101 is fixedly connected to the top of the metering hopper 8, forming a closed material inlet channel, which can prevent dust from overflowing during the material's descent. The metering hopper 8, as the core component for material storage and quantity control, has a preset internal volume that can temporarily store the amount of material required for a single drying cycle, laying the foundation for subsequent uniform feeding.

[0042] When material needs to be fed into the cylinder 1, the control system sends a start signal to the electric push rod 19. The piston rod of the electric push rod 19 extends along the axial direction, driving the movable block 20, which is fixedly connected to its piston, to move synchronously. Since the movable block 20 is rotatably connected to the arc-shaped baffle 9, and the other end of the arc-shaped baffle 9 is rotatably connected to the outer wall of the metering hopper 8, the movement of the movable block 20 is converted into the rotation of the arc-shaped baffle 9 around the connection point. By adjusting the extension length of the piston rod of the electric push rod 19, the opening and closing angle of the arc-shaped baffle 9 can be precisely controlled.

[0043] It should be noted that when the arc-shaped baffle 9 is fully closed, the discharge port at the bottom of the metering hopper 8 is blocked, and the material is temporarily stored in the hopper. When the arc-shaped baffle 9 gradually opens, the material in the metering hopper 8 falls evenly along the discharge port and into the cylinder 1. The opening and closing rate of the arc-shaped baffle 9 can be controlled by adjusting the running speed of the electric push rod 19, thereby adjusting the feeding speed to suit different materials. For materials that are prone to caking, slow feeding is required, while materials with good flowability can be fed quickly to avoid material accumulation due to excessive feeding or affecting drying efficiency due to excessively slow feeding.

[0044] When the material is stored in the metering hopper 8, the first motor 6 is started to drive the spiral stirring rod 7 to rotate at high speed. The rotation of the spiral blades generates centrifugal force, which can break up lumps of material and prevent the material from clumping due to moisture or adhesion. This ensures that the material is fully heated when it comes into contact with the disc 4. At the same time, the spiral structure of the spiral blades has a conveying and guiding function, which can guide the dispersed material evenly to different areas inside the cylinder 1 and prevent the material from accumulating. For materials with poor flowability, the stirring action of the spiral stirring rod 7 can also prevent the material from clogging the discharge port of the metering hopper 8 during the falling process, ensuring a smooth feeding process.

[0045] The equipment requires a PLC controller as the core of the timing control. When the stirring is started, the operator sends a stirring start command to the PLC controller through the control panel and starts the built-in timing module. Different time presets are made according to the properties of different materials. When the timer reaches the preset time, the PLC controller determines that the material stirring is complete and immediately sends a signal to the electric push rod 19 to control the piston rod of the electric push rod 19 to drive the movable block 20 to move, thereby pulling the arc baffle 9 to rotate around the connection point, opening the bottom outlet of the metering hopper 8, so that the stirred material falls evenly onto the cylinder 1.

[0046] Example 4

[0047] like Figure 1-8 As shown in the figure, an embodiment of the present invention provides a disc dryer, which includes an inner cylinder 1 with an overlapping plate 3 fixedly connected to it, and an outer cylinder 1 with multiple discs 4 of different radii fixedly connected to the outer side of the overlapping plate 3. The multiple discs 4 are designed with different radii, and the small discs and large discs are arranged alternately in the vertical direction and fixed to the outside of the shaft 11 by the overlapping plate 3. When the material after being dispersed falls from the metering hopper 8 into the uppermost disc 4, the shaft 11 rotates under the drive of the second motor 10, which drives the radially alternating radial rakes 13 to rotate synchronously. On the small discs, the axial rakes 13 push the material to the edge of the small disc 4, so that it falls to the lower large disc 4. On the large discs, the rakes 13 push the material to the center through hole of the large disc, so that it falls to the lower small disc, and then falls into the bottom of the cylinder 1. The discharge valve 103 is opened so that the material can flow out from the discharge pipe 102.

[0048] The heat-conducting oil 5 filled inside the disc 4 has good thermal stability and heat transfer uniformity. When the multiple sets of heating wires 21 on the lower surface of the disc 4 are energized and heated, the heat is quickly transferred to the heat-conducting oil 5, causing the heat-conducting oil 5 to heat up as a whole. Subsequently, the heat-conducting oil 5 evenly conducts the heat to the metal shell of the disc 4, making the entire surface of the disc 4 a stable high-temperature heat transfer surface. After the material falls onto the disc 4, it quickly absorbs heat through direct contact with the high-temperature surface of the disc 4, realizing the evaporation of moisture and completing the drying process.

[0049] Example 5

[0050] like Figure 1-8 As shown in the figure, a disc dryer of the present invention includes a dust collector 22 fixedly connected inside the second plate 202. The dust collector 22 is fixedly connected to the exhaust port of the cylinder 1 through the first pipe 23. When the dust-laden exhaust gas enters the dust collector 22, it will first pass through the airflow distribution device to make the exhaust gas diffuse evenly in the chamber of the dust collector 22, so as to avoid the local airflow velocity being too fast and causing uneven load on the filter components.

[0051] Subsequently, the dust in the exhaust gas will be blocked by the micropores of the filter element in the dust collector 22. During the filtration process, the dust collector 22 will also regularly clean the dust attached to the surface of the filter components through a preset dust removal mechanism to prevent dust accumulation from causing a decrease in filtration efficiency. The cleaned dust will fall into the dust collection hopper at the bottom of the dust collector 22. The dust collection hopper discharge valve can be opened periodically for recycling or treatment to achieve harmless disposal of the dust.

[0052] At this time, after the induced draft fan 25 fixed on the second plate 202 is started, its internal impeller rotates at high speed, forming a negative pressure environment in the second pipe 24, generating a continuous traction force. Under the action of this traction force, the clean exhaust gas flows out from the outlet of the dust collector 22. The clean exhaust gas is finally extracted from the equipment by the induced draft fan 25 through the second pipe 24 and smoothly discharged into the external environment, avoiding the pollution of the operating environment and surrounding air by the dust in the untreated exhaust gas, and meeting the environmental protection emission requirements.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0054] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A tray dryer comprising: The cylinder (1) and the support (2) are characterized in that the support (2) includes a first plate (201) and a second plate (202), the first plate (201) is fixedly connected to the second plate (202) through a connecting plate (203), the interior of the second plate (202) is fixedly connected to the cylinder (1), the interior of the cylinder (1) is fixedly connected to an overlapping plate (3), the exterior of the overlapping plate (3) is fixedly connected to a plurality of discs (4) of different radii, and the interior of the plurality of discs (4) is filled with heat-conducting oil (5); The top of the cylinder (1) is fixedly connected to a first motor (6), and the output end of the first motor (6) is fixedly connected to a spiral stirring rod (7). A metering hopper (8) is provided outside the spiral stirring rod (7), and two symmetrically arranged arc-shaped baffles (9) are rotatably connected to the outside of the metering hopper (8). The bottom of the cylinder (1) is fixedly connected to a second motor (10), the output end of the second motor (10) is fixedly connected to a shaft (11), the outside of the shaft (11) is fixedly connected to an arm (12), and the lower surface of the arm (12) is fixedly connected to multiple rake plates (13). A gas storage tank (14) is fixedly connected to the upper surface of the second plate (202). An exhaust valve (15) is provided at the outlet of the gas storage tank (14). The outlet of the exhaust valve (15) is fixedly connected to a rotary joint (17) through an air pipe (16). The port of the rotary joint (17) is rotatably connected to the shaft (11). Multiple sets of air inlets (18) are vertically distributed from top to bottom on the outside of the shaft (11).

2. A disc dryer according to claim 1, characterised in that An electric push rod (19) is rotatably connected to the outside of the metering hopper (8). A movable block (20) is fixedly connected to the output end of the electric push rod (19). The outside of the movable block (20) is rotatably connected to the arc-shaped baffle (9).

3. A disc dryer according to claim 1, characterised in that Multiple sets of heating wires (21) are provided on the lower surface of the multiple disks (4), and the multiple sets of heating wires (21) are used in conjunction with the heat transfer oil (5).

4. A disc dryer according to claim 1, characterised in that A dust collector (22) is fixedly connected inside the second plate (202), and the dust collector (22) is fixedly connected to the exhaust port of the cylinder (1) through the first pipe (23).

5. A disc dryer according to claim 4, characterised in that The outlet of the dust collector (22) is fixedly connected to an induced draft fan (25) through a second pipe (24), and the induced draft fan (25) is fixedly installed on the second plate (202).

6. A disc dryer according to claim 1, characterised in that The top of the metering hopper (8) is fixedly connected to the cylinder (1), and the top of the cylinder (1) is provided with a discharge port (101).

7. A disc dryer according to claim 1, characterised in that The plurality of disks (4) are arranged alternately in a vertical direction on the outside of the shaft (11), and the inside of the shaft (11) has an air supply channel.

8. A disc dryer according to claim 1, characterised in that The air inlet (18) is equipped with a spring-loaded miniature check valve (181).

9. A disc dryer according to claim 1, characterised in that A barometer (26) is provided on the top of the cylinder (1), and the detection probe of the barometer (26) penetrates the cylinder (1) and extends into the interior.

10. A disc dryer according to claim 1, characterized in that, The bottom of the cylinder (1) is provided with a discharge pipe (102), and a discharge valve (103) is provided on the discharge pipe (102).

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