A blowing drying structure and a drying device for preparing iron phosphate

Abstract

The present invention provides a blowing drying structure and a drying device for preparing ferric phosphate, wherein a feed chamber is provided at the top of a drying cylinder, a hopper connected to the feed chamber is provided at the upper end of the drying cylinder, an annular feeding screen is provided at the edge of the bottom of the feeding chamber, a rotating disk is rotatably connected in the feeding chamber, a driving motor is installed at the upper end of the drying cylinder, a plurality of pressing blades are provided on the outer side of the rotating disk, and a plurality of inclined scrapers are connected to the lower end of the annular feeding screen at the rotating disk; a central exhaust pipe is provided downwardly below the inclined scraper in the drying cylinder, an air outlet pipe is provided outwardly at the upper end of the central exhaust pipe, a spiral guide blade is provided between the outer wall of the central exhaust pipe and the inner wall of the drying cylinder, and an air inlet pipe is provided at the upper part of the drying cylinder along the sectional direction thereof; and a blower is also included, the inlet end of the blower is connected to the air outlet pipe, and the outlet end of the blower is connected to the air inlet pipe. The present invention can dry the material quickly and evenly, and the air is circulated in the process to prevent air pollution.

Description

Technical Field

[0001] The invention belongs to the field of material drying equipment and relates to an air blowing drying structure and a drying device for preparing iron phosphate. Background Art

[0002] In modern industrial production, material drying, as a basic and key process link, plays an important role in ensuring product quality and improving production efficiency. Especially in the chemical, pharmaceutical, food and other industries, material drying is an important step to ensure the stable performance and excellent quality of the final product. At present, the common drying equipment on the market mainly adopts hot air drying, vacuum drying, microwave drying, infrared drying and other methods. Among them, hot air drying is widely used because of its simple operation and wide range of applications. However, although these drying methods have their own advantages, they also have some common problems, such as low drying efficiency and unstable drying effect. Especially when dealing with certain special materials, these problems are particularly prominent.

[0003] Take iron phosphate as an example. As an important industrial raw material, it is widely used in battery manufacturing, medicine, agriculture and other fields. In the processing of iron phosphate, it usually needs to undergo a series of chemical reactions before being crushed to meet the needs of subsequent processing or use. In this process, the drying step is crucial. It not only affects the physical properties of iron phosphate, such as particle size distribution and fluidity, but also directly affects its chemical activity and stability. Although traditional drying methods, such as hot air drying, can achieve preliminary moisture removal, in actual applications, due to the special properties of iron phosphate, such as easy agglomeration and wall sticking, it often leads to uneven drying and even local overheating, affecting the quality of the final product.

[0004] In addition, during the operation of existing drying equipment, air absorbs moisture from the material and forms high-humidity exhaust gas. These wet air often carry harmful substances such as organic solvents, acidic and alkaline gases volatilized from the material. If they are directly discharged into the environment without treatment, they will cause serious pollution to the atmosphere, which not only violates environmental protection regulations, but also poses a threat to the surrounding ecological environment and human health. Summary of the invention

[0005] The object of the present invention is to provide an air blowing drying structure and a drying device for preparing ferric phosphate, which can quickly and evenly dry materials, and circulate air in the drying process to prevent air pollution.

[0006] In order to solve the above technical problems, the present invention provides a blowing drying device, comprising a vertically arranged drying cylinder, a feeding chamber is arranged on the top of the drying cylinder, a feeding hopper connected with the feeding chamber is arranged on the upper end of the drying cylinder, an annular material discharge screen is arranged on the edge of the bottom of the feeding chamber, a rotating disk is rotatably connected in the feeding chamber, a driving motor for driving the rotating disk to rotate is installed on the upper end of the drying cylinder, a plurality of circumferentially distributed pressing blades are arranged on the outer side of the rotating disk, each pressing blade is inclined and its lower edge contacts with the upper end of the annular material discharge screen, the pressing blade presses the material on the annular material discharge screen downward to make it pass through the mesh, the rotating disk passes downward through the annular material discharge screen and is connected to a connecting shaft, the connecting shaft is connected to the lower end of the annular material discharge screen with a plurality of circumferentially distributed inclined scrapers, the inclined scrapers are used to hang the material passing through the annular material discharge screen into particles;

[0007] A central exhaust tube is arranged downwardly below the inclined scraper in the drying cylinder, the lower end of the central exhaust tube is open and a gap is left between the central exhaust tube and the bottom of the drying cylinder, an air outlet pipe is arranged outwardly at the upper end of the central exhaust tube to pass through the drying cylinder, a drying gap matching the annular feeding screen is formed between the outer wall of the central exhaust tube and the inner wall of the drying cylinder, a spiral guide blade is arranged from top to bottom in the drying gap, so that a spiral drying channel is formed from top to bottom in the drying gap, an air inlet pipe is arranged on the upper part of the drying cylinder along the cross-sectional direction thereof, and the air inlet pipe is connected with the upper end of the spiral drying channel;

[0008] It also includes a blower, the inlet end of the blower is connected to the air outlet pipe, the outlet end of the blower is connected to the air inlet pipe, a discharge channel is provided at the bottom of the drying cylinder, a discharge motor is installed at one end of the discharge channel, a spiral discharge rod connected to the power output shaft of the discharge motor is rotatably connected in the discharge channel, and a discharge port is provided at the lower end of the discharge channel close to the discharge motor.

[0009] By adopting the above technical scheme, when drying materials, firstly, the wet materials are continuously fed into the feeding hopper, and the materials in the feeding hopper are continuously transported into the feeding chamber, and the driving motor drives the rotating disk to rotate, driving the pressing blades to rotate to press the materials on the annular feeding screen downward so that they pass through the annular feeding screen, and at the same time, the inclined scraper rotating with the rotating disk drops the materials passing through the annular feeding screen into the spiral drying channel in the form of particles, and at the same time, the hot air generated by the blower is blown into the spiral drying channel through the air inlet pipe, and the hot air is continuously blown downward along the spiral drying channel, driving the materials in the spiral drying channel to continuously turn over and move downward, and continuously taking away the moisture of the materials, and finally passing through the spiral drying channel and falling to the bottom of the drying cylinder, and the hot air cannot be discharged downward after passing through the spiral drying channel, and can only enter the central exhaust pipe upward, and finally be discharged through the exhaust pipe, and the dry materials are transported and discharged from the bottom of the drying cylinder from the discharge port by the rotation of the spiral discharge rod.

[0010] The present invention is further configured such that a feed channel connected to the feed chamber is provided at the lower end of the feeding hopper, a feed motor is installed at one end of the feed channel, a spiral feed rod connected to a power output shaft of the feed motor is rotatably connected in the feed channel, and a feed port is opened at the lower end of the feed channel above the annular feed screen.

[0011] The present invention is further configured such that the inclined scrapers are arranged in one-to-one correspondence with the pressing blades.

[0012] The present invention is further configured such that each pressing blade is made of elastic rubber sheet.

[0013] The present invention is further configured such that a dust filter is provided in the central exhaust pipe below the air outlet pipe.

[0014] The present invention is further configured such that a supporting mesh disk is provided in the central exhaust pipe below the exhaust pipe, the dust filter is provided at the lower end of the supporting mesh disk, and a vibration motor is installed at the upper end of the supporting mesh disk.

[0015] The present invention also provides a drying device for preparing iron phosphate, wherein the free end of the air outlet pipe is connected to a vertically arranged condensation channel pipe, a heat absorption pipe is arranged in the condensation channel pipe, the lower end of the condensation channel pipe is connected to a sealed liquid accumulation tank, the lower end of the condensation channel pipe is connected to the inlet end of the blower through a suction pipe, the free end of the air inlet pipe is connected to a vertically arranged hot air channel pipe, a heat release pipe is arranged in the hot air channel pipe, and the lower end of the hot air channel pipe is connected to the outlet end of the blower through the air outlet pipe;

[0016] The refrigeration system includes a refrigeration shell, a compressor and an expansion valve are arranged in the refrigeration shell, one end of the heat absorption tube is connected to the inlet end of the compressor, the other end of the heat absorption tube is connected to one end of the expansion valve, one end of the heat release tube is connected to the outlet end of the compressor, and the other end of the heat release tube is connected to the free end of the expansion valve.

[0017] By adopting the above technical scheme, when the material is dried in the drying cylinder, the humid air discharged from the air outlet pipe enters the condensation channel tube and flows downward along the heat absorbing plate. Due to the operation of the refrigeration system, the medium of low temperature and low pressure flows in the heat absorbing tube. The low temperature of the heat absorbing tube makes the heat absorbing plate become low temperature and heat absorbing, absorbing the heat in the humid air, so that the water vapor is cooled and condensed into water droplets on the heat absorbing plate, and finally flows down to the liquid accumulation tank along the heat absorbing plate. The air after dehumidification and drying enters and circulates into the hot air channel tube through the blower. Due to the operation of the refrigeration system, the medium of high temperature and high pressure flows in the heat releasing tube. After the cold air passes through the heat releasing tube, it is gradually heated into hot air, and finally circulates along the air inlet pipe again to the spiral drying channel for material drying, so that the air is circulated internally to prevent the pollutants carried by the external discharge from polluting the air.

[0018] The present invention is further configured such that the heat absorption tube is vertically arranged in the middle of the condensation channel tube in a serpentine shape and coils back and forth; both sides of the heat absorption tube are provided with cooling fins arranged along the height direction of the condensation channel tube; each cooling fin is provided with a plurality of vertically arranged heat absorption fins outwardly; the lower end of the condensation channel tube is provided with an air outlet cavity connected to the suction tube; the inner diameter of the air outlet cavity is larger than the inner diameter of the condensation channel tube, so that the airflow on both sides of the heat absorption tube can flow into the suction tube through the air outlet cavity.

[0019] The present invention is further configured such that the heat release pipe includes an outer spiral heat release pipe vertically arranged in the hot air channel pipe and an inner spiral heat release pipe arranged in the outer spiral heat release pipe, and the outer spiral heat release pipe is connected end to end with the inner spiral heat release pipe.

[0020] The present invention is further configured such that the lower end of the liquid accumulation tank is connected to an outwardly disposed drainage pipe, and a valve is disposed on the drainage pipe.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] First, the present invention adopts a new spiral air blowing drying method, which drives the material to move continuously downward along the spiral drying channel through air blowing, and the material is constantly turned over by the air blowing during the process, so that the material can be dried quickly and evenly, and the drying effect is better;

[0023] Secondly, before the air drying, the present invention squeezes and cuts the wet material, and the small particles fall into the spiral drying channel. The material is not easy to clump or stick to the wall, and is easier to be moved by the wind. The small particles are easier to lose moisture, which is conducive to faster and more uniform drying.

[0024] Third, when performing hot air drying, the present invention does not simply heat the air, but combines the refrigeration system to heat the air at the outlet end of the blower. After the humid air after material drying passes through the condensation channel tube, the moisture in the humid air condenses and flows downward, and the harmful gases in the air are dissolved in water and collected downward. Subsequently, the dehumidified air is circulated to the blower again for internal air circulation to prevent the air from being polluted by pollutants carried by the external exhaust. It can be used for drying materials such as iron phosphate that will produce harmful gases. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a partial cross-sectional view used to show the internal structure of the drying cylinder;

[0027] Figure 3 It is a plane cross-sectional view used to show the internal structure of the drying cylinder;

[0028] Figure 4 It is a partial cross-sectional view used to show the internal structure of the central exhaust pipe;

[0029] Figure 5 It is a partial cross-sectional view used to show the internal structure of the condensation channel tube;

[0030] Figure 6 It is a partial cross-sectional view used to show the internal structure of the hot air channel pipe;

[0031] Figure 7 It is a partial cross-sectional view used to show the internal structure of the refrigeration shell.

[0032] Among them, 1. drying cylinder; 2. feeding chamber; 3. annular feeding screen (3); 4. feeding hopper; 5. feeding channel; 6. feeding motor; 7. spiral feeding rod; 8. feeding port; 9. rotating disk; 10. driving motor; 11. pressing blade; 12. connecting shaft; 13. inclined scraper; 14. central exhaust pipe; 15. exhaust pipe; 16. supporting net disk; 17. dust filter; 18. vibration motor; 19. spiral guide blade; 20. spiral drying channel; 21. feeding Air duct; 22. Blower; 23. Discharge channel; 24. Discharge motor; 25. Spiral discharge rod; 26. Discharge port; 27. Condensation channel tube; 28. Heat absorption tube; 29. ​​Cooling plate; 30. Heat absorption plate; 31. Air outlet cavity; 32. Suction pipe; 33. Liquid accumulation tank; 34. Drain pipe; 35. Valve; 36. Hot air channel tube; 37. External spiral heat release tube; 38. Internal spiral heat release tube; 39. Air outlet pipe; 40. Refrigeration shell; 41. Compressor; 42. Expansion valve. DETAILED DESCRIPTION

[0033] The following is a further detailed description of a blowing drying structure and a drying device for preparing ferric phosphate proposed by the present invention in combination with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will become clearer. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. The same or similar reference numerals in the accompanying drawings represent the same or similar parts.

[0034] Example 1, reference Figure 1-4 A blowing drying structure comprises a vertically arranged drying cylinder 1, a feeding chamber 2 is arranged on the top of the drying cylinder 1, a circle of annular feeding screen 3 is arranged on the edge of the bottom of the feeding chamber 2, a feeding hopper 4 connected with the feeding chamber 2 is arranged on the upper end of the drying cylinder 1, a feeding channel 5 horizontally arranged and connected with the feeding chamber 2 is arranged on the lower end of the feeding hopper 4, a feeding motor 6 is installed at one end of the feeding channel 5 of the drying cylinder 1, a spiral feeding rod 7 connected with the power output shaft of the feeding motor 6 is rotatably connected in the feeding channel 5, a feeding port 8 is opened at the lower end of the feeding channel 5 above the annular feeding screen 3, and the material in the feeding hopper 4 is transported to the feeding chamber 2 by the rotation of the spiral feeding rod 7.

[0035] A rotating disk 9 is rotatably connected in the feed chamber 2, and a driving motor 10 for driving the rotating disk 9 to rotate is installed at the upper end of the drying cylinder 1. A plurality of circumferentially distributed pressing blades 11 are arranged on the outer side of the rotating disk 9, each pressing blade 11 is inclined and its lower edge contacts the upper end of the annular feeding screen 3, and each pressing blade 11 is made of elastic rubber. The elastic pressing blade 11 can better exert pressure on the material, and the pressing blade 11 presses the material on the annular feeding screen 3 downward to pass through the mesh, and the rotating disk 9 passes downward through the annular feeding screen 3 and is connected to a connecting shaft 12, and the connecting shaft 12 is connected to the lower end of the annular feeding screen 3 with a plurality of circumferentially distributed inclined scrapers 13, and the inclined scrapers 13 are arranged one by one with the pressing blades 11, and the cutting edge of the inclined scraper 13 contacts the lower end of the annular feeding screen 3, and the inclined scraper 13 is used to hang the material passing through the annular feeding screen 3 into particles.

[0036] A central exhaust pipe 14 is arranged downwardly below the inclined scraper 13 in the drying cylinder 1. The lower end of the central exhaust pipe 14 is open and a gap is left between it and the bottom of the drying cylinder 1. This gap is used to temporarily store dried materials. An outlet pipe 15 that passes through the drying cylinder 1 is arranged outwardly from the upper end of the central exhaust pipe 14. The wet air in the central exhaust pipe 14 is discharged through the outlet pipe 15. A supporting mesh plate 16 is arranged below the outlet pipe 15 in the central exhaust pipe 14. A dust filter 17 is arranged at the lower end of the supporting mesh plate 16. A vibration motor 18 is installed at the upper end of the supporting mesh plate 16. When the dust filter 17 is clogged with dust accumulation, the vibration motor 18 drives the dust filter 17 to work and can shake off the dust attached to its surface, thereby ensuring good ventilation. A drying gap matching the annular material discharge screen 3 is formed between the outer wall of the central exhaust tube 14 and the inner wall of the drying tube 1. A top-down spiral guide blade 19 is arranged in the drying gap, so that a top-down spiral drying channel 20 is formed in the drying gap, so that the material can be dried spirally downward along the spiral drying channel 20. An air inlet pipe 21 is arranged on the upper part of the drying tube 1 along its cross-sectional direction. The air inlet pipe 21 is connected with the upper end of the spiral drying channel 20. Hot air is blown into the spiral drying channel 20 through the air inlet pipe 21 to take away the moisture of the material in the spiral drying channel 20.

[0037] The drying cylinder 1 further comprises a blower 22, which can produce hot air. The inlet end of the blower 22 is connected to the air outlet pipe 15, and the outlet end of the blower 22 is connected to the air inlet pipe 21. A discharge channel 23 is arranged at the bottom of the drying cylinder 1, and a discharge motor 24 is installed at one end of the discharge channel 23. A spiral discharge rod 25 connected to the power output shaft of the discharge motor 24 is rotatably connected in the discharge channel 23. A discharge port 26 is provided at the lower end of the discharge channel 23 near the discharge motor 24, and the material at the bottom of the drying cylinder 1 is transported and discharged from the discharge port 26 by the rotation of the spiral discharge rod 25.

[0038] Example 2, reference Figure 1 ,5-7, based on a blowing drying structure of Example 1, a drying device for preparing iron phosphate is provided, which can be used for drying materials such as iron phosphate that can produce harmful gases. The free end of the air outlet pipe 15 is connected to a vertically arranged condensation channel pipe 27, and a heat absorption pipe 28 is arranged in the condensation channel pipe 27. The heat absorption pipe 28 is arranged vertically in the middle of the condensation channel pipe 27 in a serpentine shape and is coiled back and forth. Both sides of the heat absorption pipe 28 are provided with a piece of heat absorption pipe arranged along the height direction of the condensation channel pipe 27. The cooling fins 29 are each provided with a plurality of vertically arranged heat absorbing fins 30 outwardly. The discharged moisture is cooled after passing through the heat absorbing fins 30. After the water vapor is cooled, it condenses on the heat absorbing fins 30. The lower end of the condensation channel tube 27 is provided with an air outlet cavity 31. The air outlet cavity 31 is connected to the inlet end of the blower 22 through a suction pipe 32. The inner diameter of the air outlet cavity 31 is larger than the inner diameter of the condensation channel tube 27, so that the airflow on both sides of the heat absorbing tube 28 can flow into the suction pipe 32 through the air outlet cavity 31. The lower end of the condensation channel tube 27 is connected to a sealed liquid storage tank 33. The lower end of the liquid storage tank 33 is connected to an outwardly arranged drain pipe 34. A valve 35 is provided on the drain pipe 34. When too much water accumulates in the liquid storage tank 33, the valve 35 is opened to drain water through the drain pipe 34.

[0039] The free end of the air inlet pipe 21 is connected to a vertically arranged hot air channel pipe 36, and a heat release pipe is arranged in the hot air channel pipe 36. The heat release pipe includes an outer spiral heat release pipe 37 vertically arranged in the hot air channel pipe 36, and an inner spiral heat release pipe 38 arranged in the outer spiral heat release pipe 37. The outer spiral heat release pipe 37 and the inner spiral heat release pipe 38 are connected end to end. After the cold air passes through the outer spiral heat release pipe 37 and the inner spiral heat release pipe 38, it is gradually heated into hot air. The lower end of the hot air channel pipe 36 is connected to the outlet end of the blower 22 through an air outlet pipe 39.

[0040] It includes a refrigeration system, which is an air-conditioning refrigeration system commonly used in the prior art, so the detailed technical structure is not elaborated again. The refrigeration system includes a refrigeration shell 40, in which a compressor 41 and an expansion valve 42 are arranged, one end of the heat absorption tube 28 is connected to the inlet end of the compressor 41, the other end of the heat absorption tube 28 is connected to one end of the expansion valve 42, one end of the heat release tube is connected to the outlet end of the compressor 41, and the other end of the heat release tube is connected to the free end of the expansion valve 42.

[0041] Working principle: When drying materials, firstly, wet materials are continuously fed into the feeding hopper 4, and the feeding motor 6 and the spiral feeding rod 7 rotate to transport the materials in the feeding hopper 4 to the feeding chamber 2. The driving motor 10 drives the rotating disk 9 to rotate, driving the pressing blade 11 to rotate and press the materials on the annular feeding screen 3 downward to make it pass through the annular feeding screen 3. At the same time, the inclined scraper 13 rotating with the rotating disk 9 will make the materials passing through the annular feeding screen 3 fall into the spiral drying channel 20 in the form of particles. At the same time, the hot air generated by the blower 22 passes through the feeding chamber 2. The air duct 21 blows into the spiral drying channel 20, and the hot air blows downward along the spiral drying channel 20, driving the material in the spiral drying channel 20 to continuously turn over and move downward, while continuously taking away the moisture of the material, and finally falling to the bottom of the drying cylinder 1 after passing through the spiral drying channel 20. After passing through the spiral drying channel 20, the hot air cannot be discharged downward, but can only enter the central exhaust pipe 14 upward, and finally be discharged through the outlet pipe 15. The dried material is transported and discharged from the bottom of the drying cylinder 1 from the discharge port 26 through the rotation of the spiral discharge rod 25;

[0042] The humid air discharged from the air outlet pipe 15 enters the condensation channel pipe 27 and flows downward along the heat absorbing plate 30. Due to the operation of the refrigeration system, a low-temperature and low-pressure medium flows in the heat absorbing pipe 28. The low temperature of the heat absorbing pipe 28 makes the heat absorbing plate 30 absorb heat at a low temperature, absorb the heat in the humid air, and condense into water droplets on the heat absorbing plate 30 after the water vapor is cooled. Finally, it flows down to the liquid storage tank 33 along the heat absorbing plate 30. The dehumidified and dried air enters the hot air channel pipe 36 through the blower 22. Due to the operation of the refrigeration system, a high-temperature and high-pressure medium flows in the heat releasing pipe. After passing through the heat releasing pipe, the cold air is gradually heated to hot air, and finally circulates to the spiral drying channel 20 along the air inlet pipe 21 again to dry the material, so that the air is internally circulated to prevent the pollutants carried by the external discharge from polluting the air.

[0043] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0044] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A blowing drying device, comprising a vertically arranged drying cylinder (1), characterized in that: A feed chamber (2) is arranged at the top of the drying cylinder (1), a hopper (4) connected to the feed chamber (2) is arranged at the upper end of the drying cylinder (1), an annular feeding screen (3) is arranged at the edge of the bottom of the feed chamber (2), a rotating disk (9) is rotatably connected in the feed chamber (2), a driving motor (10) for driving the rotating disk (9) to rotate is installed at the upper end of the drying cylinder (1), and a plurality of circumferentially distributed pressing blades (11) are arranged on the outer side of the rotating disk (9), and each pressing blade (11) is circumferentially distributed. The pressing blade (11) is arranged to be inclined and its lower side is in contact with the upper end of the annular material discharging screen (3). During the rotation process, the material pressing blade (11) presses the material on the annular material discharging screen (3) downward to make it pass through the mesh. The rotating disk (9) passes downward through the annular material discharging screen (3) and is connected to a connecting shaft (12). The connecting shaft (12) is connected to the lower end of the annular material discharging screen (3) with a plurality of circumferentially distributed inclined scrapers (13). The inclined scrapers (13) are used to drop the material passing through the annular material discharging screen (3) into granular form. A central exhaust pipe (14) is arranged downwardly below the inclined scraper (13) in the drying cylinder (1); the lower end of the central exhaust pipe (14) is open and a gap is left between the central exhaust pipe (14) and the bottom of the drying cylinder (1); an air outlet pipe (15) is arranged outwardly at the upper end of the central exhaust pipe (14) to pass through the drying cylinder (1); a drying gap matching the annular material discharge screen (3) is formed between the outer wall of the central exhaust pipe (14) and the inner wall of the drying cylinder (1); a spiral guide blade (19) is arranged from top to bottom in the drying gap, so that a spiral drying channel (20) is formed from top to bottom in the drying gap; an air inlet pipe (21) is arranged at the upper part of the drying cylinder (1) along its cross-sectional direction; the air inlet pipe (21) is connected to the upper end of the spiral drying channel (20); The drying cylinder (1) further comprises a blower (22), the inlet end of the blower (22) being connected to the air outlet pipe (15), the outlet end of the blower (22) being connected to the air inlet pipe (21), a discharge channel (23) being arranged at the bottom of the drying cylinder (1), a discharge motor (24) being installed at one end of the discharge channel (23), a spiral discharge rod (25) being rotatably connected to the power output shaft of the discharge motor (24) being arranged in the discharge channel (23), and a discharge port (26) being arranged at the lower end of the discharge channel (23) close to the discharge motor (24).

2. The air drying device according to claim 1, characterized in that: The lower end of the feeding hopper (4) is provided with a feeding channel (5) connected to the feeding chamber (2); a feeding motor (6) is installed at one end of the feeding channel (5); a spiral feeding rod (7) connected to the power output shaft of the feeding motor (6) is rotatably connected in the feeding channel (5); and a feeding port (8) is opened at the lower end of the feeding channel (5) above the annular feeding screen (3).

3. The air drying device according to claim 1, characterized in that: The inclined scrapers (13) are arranged in one-to-one correspondence with the pressing blades (11).

4. The blowing and drying device according to claim 1, characterized in that: Each pressing blade (11) is made of elastic rubber sheet.

5. The blowing and drying device according to claim 1, characterized in that: A dust filter (17) is arranged in the central exhaust pipe (14) below the exhaust pipe (15).

6. The blowing and drying device according to claim 5, characterized in that: A supporting mesh disk (16) is arranged in the central exhaust pipe (14) below the exhaust pipe (15), the dust filter (17) is arranged at the lower end of the supporting mesh disk (16), and a vibration motor (18) is installed at the upper end of the supporting mesh disk (16).

7. A drying device for preparing iron phosphate, based on the blowing drying device according to any one of claims 1 to 6, characterized in that: The free end of the air outlet pipe (15) is connected to a vertically arranged condensation channel pipe (27), a heat absorption pipe (28) is arranged in the condensation channel pipe (27), the lower end of the condensation channel pipe (27) is connected to a sealed liquid accumulation tank (33), the lower end of the condensation channel pipe (27) is connected to the inlet end of the blower (22) through a suction pipe (32), the free end of the air inlet pipe (21) is connected to a vertically arranged hot air channel pipe (36), a heat release pipe is arranged in the hot air channel pipe (36), and the lower end of the hot air channel pipe (36) is connected to the outlet end of the blower (22) through an air outlet pipe (39); The refrigeration system comprises a refrigeration shell (40), a compressor (41) and an expansion valve (42) are arranged in the refrigeration shell (40), one end of the heat absorption pipe (28) is connected to the inlet end of the compressor (41), the other end of the heat absorption pipe (28) is connected to one end of the expansion valve (42), one end of the heat release pipe is connected to the outlet end of the compressor (41), and the other end of the heat release pipe is connected to the free end of the expansion valve (42).

8. A drying device for preparing ferric phosphate according to claim 7, characterized in that: The heat absorption tube (28) is arranged vertically in the middle of the condensation channel tube (27) in a serpentine shape and coils back and forth. Both sides of the heat absorption tube (28) are provided with cooling fins (29) arranged along the height direction of the condensation channel tube (27). Each cooling fin (29) is provided with a plurality of vertically arranged heat absorption fins (30) outwardly. The lower end of the condensation channel tube (27) is provided with an air outlet cavity (31) connected to the suction tube (32). The inner diameter of the air outlet cavity (31) is larger than the inner diameter of the condensation channel tube (27), so that the airflow on both sides of the heat absorption tube (28) can flow into the suction tube (32) through the air outlet cavity (31).

9. A drying device for preparing ferric phosphate according to claim 7, characterized in that: The heat release pipe comprises an outer spiral heat release pipe (37) vertically arranged in the hot air channel pipe (36), and an inner spiral heat release pipe (38) arranged in the outer spiral heat release pipe (37), wherein the outer spiral heat release pipe (37) and the inner spiral heat release pipe (38) are connected end to end.

10. A drying device for preparing ferric phosphate according to claim 7, characterized in that: The lower end of the liquid storage tank (33) is connected to a liquid discharge pipe (34) arranged outward, and a valve (35) is arranged on the liquid discharge pipe (34).

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