Multi-layer belt type powder drying and sorting integrated equipment and drying method

Abstract

The invention relates to multi-layer belt type powder drying and sorting integrated equipment and a drying method, and belongs to the technical field of powder material drying. The dryer comprises a feeding system, a drying box, a hot air closed circulating system, a dust remover and a sorting machine, the dust remover is arranged at an exhaust port of the drying box, the drying box is a sealed box body with a negative pressure environment formed inside, multiple layers of mesh belts are arranged inside the drying box at intervals from top to bottom, S-shaped conveying is formed between the mesh belts, and a feeding port is formed in the top of the drying box. The feeding system is communicated with the feeding port; a discharging opening is formed in the bottom of the drying box, and the sorting machine is connected with the discharging opening in the bottom of the drying box and used for sorting the dried materials; the hot air closed circulating system is used for supplying heat to the drying box and recycling heat in moisture of the drying box; the drying method adopts drying and sorting integrated equipment. Cyclic utilization of heat energy is achieved through the hot air closed circulation system, energy consumption is reduced, and heat efficiency is improved.

Description

Technical Field

[0001] The invention relates to multi-layer belt-type powder drying and sorting integrated equipment and a drying method, belonging to the technical field of powder material drying. Background Art

[0002] In modern industrial production, the drying of powder materials is a key process in the production processes of many industries such as food, medicine, chemicals, and new materials. Traditional powder drying equipment has many problems in its application: First, open powder drying equipment that relies on electric or gas heating suffers from high energy consumption, low thermal efficiency, and polluting emissions. Furthermore, the open structure makes it extremely easy for powder to escape into the air during the drying process. This escaped powder not only leads to material waste and increases the company's raw material costs, but also causes dust pollution in the surrounding environment. At the production site, fine powder particles are suspended in the air. Even if operators take full protective measures, it is difficult to completely avoid inhaling this dust, which can cause health problems.

[0003] Secondly, most existing mesh belt dryers utilize a single or double-deck structure, which limits the drying area and is prone to material accumulation. This not only prolongs drying time but also causes uneven heating, leading to significant fluctuations in moisture content at different locations, thus affecting the stability and consistency of the finished product. Furthermore, during the discharge process, powders are prone to agglomeration or contamination, further reducing the quality of the finished product and increasing the difficulty and cost of subsequent processing.

[0004] Furthermore, taking the production of microcapsules in the pharmaceutical industry as an example, microcapsules are formed by coating drugs. The particle size of microcapsules is typically between 80μm and 150μm. Due to their generally light weight, typically between 0.1mg and 5mg, the weight of the coating in the microcapsule accounts for a proportion of the total mass, typically between 5% and 30%. Microcapsules are susceptible to factors such as temperature during the drying process, and some microcapsules may break due to excessively high temperatures during the drying process. Existing drying equipment does not have an online sorting function when processing microcapsule materials. Therefore, defective products resulting from coating damage are difficult to sort out online, requiring additional secondary processing steps, which not only increases the complexity of the production process but also increases production costs. At the same time, conventional screening methods cannot effectively classify materials of different weights but consistent particle sizes. Summary of the Invention

[0005] The purpose of the present invention is to provide a new technical solution to improve or solve the technical problems existing in the prior art as described above.

[0006] The technical solution provided by the present invention is as follows: a multi-layer belt-type powder drying and sorting integrated equipment, including a feeding system, a drying box, a hot air closed circulation system, a dust collector and a sorting machine, the dust collector is arranged at the exhaust port of the drying box, the drying box is a sealed box with a negative pressure environment formed inside, and multiple layers of mesh belts are arranged at intervals from top to bottom inside the drying box, and the mesh belts of each layer are transported in an S-shaped manner, and the receiving end of the lower mesh belt is longer than the blanking end of the upper mesh belt. A feeding port is provided at the top of the drying box, and the feeding system is connected to the feeding port for conveying the material to be dried into the drying box; a discharge port is provided at the bottom of the drying box, and the sorting machine is connected to the discharge port at the bottom of the drying box for sorting the dried material; the hot air closed circulation system is used to supply heat to the drying box and recover heat in the moisture in the drying box.

[0007] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: 1. This invention uses a closed hot air circulation system to recycle heat energy, reducing energy consumption and improving thermal efficiency. Compared with traditional open drying equipment that relies on electric heating or gas heating, this invention effectively reduces energy consumption and emissions.

[0008] 2. The drying box is a sealed box with a negative pressure environment inside, and the discharge process is sealed throughout, which effectively prevents the escape of powder during the drying process, avoids material waste and environmental pollution, and protects the health of operators.

[0009] 3. Multiple layers of mesh belts are arranged from top to bottom inside the drying box, which increases the drying area, reduces material accumulation, makes the material heated more evenly, shortens the drying time, and improves the drying efficiency; the hot air contacts the material in the opposite direction from bottom to top, so that the high-humidity material on the top layer contacts the low-temperature hot air, and the low-humidity material on the lower layer contacts the high-temperature hot air, further improving the drying efficiency and the stability of the drying quality.

[0010] 4. The present invention also integrates a sorting machine, which can sort the materials online during the drying process, separate defective products and impurities in time, and improve the quality of the finished product. The sorting machine can perform double sorting according to particle size and specific gravity through the synergistic effect of the vibrating screen and the blower airflow sorting. Qualified small-sized particles directly enter the finished product barrel, and large-particle defectives enter the defective product collection box through the guide plate from the vibrating screen oversize outlet. Defective products with unqualified specific gravity are separated by the wind speed gradient under the action of the blower. Materials with different specific gravities fall into the multi-level defective product collection boxes arranged from near to far. Therefore, for easily damaged materials such as microcapsules, the present invention can effectively separate defective products caused by coating damage, reducing secondary processing steps and production costs.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the sorting machine includes a sorting box, a vibrating screen, a finished product barrel, a blower and a multi-stage defective product collection box. The vibrating screen, the finished product barrel and the multi-stage defective product collection box are arranged in the sorting box, and the vibrating screen is located below the discharge port of the drying box. The finished product barrel is arranged below the undersize material outlet of the vibrating screen. The air outlet of the blower is aligned with the leakage channel below the vibrating screen. The multi-stage defective product collection boxes are arranged in sequence from near to far along the direction of the airflow generated by the blower; the oversize material outlet of the vibrating screen is connected to one of the defective product collection boxes through a guide plate.

[0013] The beneficial effect of adopting the above-mentioned further scheme is that, through the synergistic effect of the vibrating screen and the blower air flow sorting, double sorting can be performed according to particle size and specific gravity. The vibrating screen can first separate out the unqualified large-particle materials, and then separate the materials with the same particle size but different specific gravity through the blower wind speed gradient. The multi-stage defective product collection box cooperates with the blower wind speed to realize grading according to the difference in material specific gravity, thereby improving the sorting accuracy and efficiency.

[0014] Furthermore, one or more filter cartridges are provided in the sorting box. The filter cartridges are provided at the end of the blowing path of the blower to prevent dust from overflowing. A dust collection box is also provided below the filter cartridges.

[0015] The beneficial effect of adopting the above further solution is that the dust collection box and the filter cartridge form a closed dust recovery path, avoiding dust pollution during the sorting process and achieving a clean production environment.

[0016] Furthermore, the sorting machine also includes an angle adjuster, which includes a horizontally arranged support plate and vertical plates arranged on both sides of the support plate, and the vertical plates are provided with arc-shaped long holes. The vertical plates are fixed in the sorting box through the arc-shaped long holes and are located below the guide plate. One or more spring columns are provided between the guide plate and the support plate, and the two ends of the spring columns are respectively connected to the guide plate and the support plate.

[0017] The beneficial effect of adopting the above further solution is that the support height of the support plate can be adjusted through the arc-shaped long hole, so that the inclination angle of the guide plate can be adjusted to adapt to the sorting requirements of materials with different fluidity, and the damping effect of the spring column can eliminate the high-frequency vibration transmitted by the vibrating screen.

[0018] Furthermore, an observation window is provided on the sorting box, and a wind collecting plate capable of adjusting the wind direction and wind speed of the blower is provided inside the sorting box.

[0019] Furthermore, the hot air closed circulation system includes a heat pump unit, a dehumidification fan and a blower. The dehumidification fan is connected to the exhaust port of the drying box through a dehumidification pipe, and is used to send the hot and humid gas in the drying box into the heat pump unit to recover waste heat. The hot air generated by the heat pump unit is sent to the bottom of the drying box through the blower.

[0020] The beneficial effect of adopting this further solution is that by recovering the waste heat from the hot and humid air, the heat pump unit can generate hot air more efficiently, reducing external energy input and lowering drying costs. In addition, the closed-loop system reduces heat exchange between the drying chamber and the external environment, helping to maintain stable temperature and humidity inside the drying chamber, thereby improving drying quality and efficiency.

[0021] Furthermore, the heat pump unit includes an air-to-air economizer, a compressor, a condenser, an expansion valve and an evaporator. The air-to-air economizer, the compressor, the condenser, the expansion valve and the evaporator are connected in a cycle in sequence. The air outlet of the dehumidification fan is connected to the air-to-air economizer through a pipeline, and the heat pump unit is connected to the drying box through a closed circulation air duct and a blower.

[0022] The beneficial effect of adopting this further solution is that the gas-to-gas economizer can more effectively recover waste heat from the hot and humid air and transfer it to the condenser, improving heat exchange efficiency. The closed circulation air duct reduces heat loss and the ingress of external impurities, ensuring the stable operation of the heat pump unit.

[0023] Furthermore, the feeding system includes a temporary storage box, an elevator and a material leveler. The temporary storage box is arranged at the feeding end of the elevator, and the material leveler is arranged at the discharging end of the elevator. The discharge port of the temporary storage box is provided with a valve, and the discharge port of the material leveler is connected to the feeding port of the drying box.

[0024] The beneficial effect of adopting this further solution is that the combination of the temporary storage box and the elevator allows materials to be continuously and stably fed into the drying box, improving the degree of production automation. The use of the material leveler ensures that the materials are evenly distributed when they are fed into the drying box, avoiding problems such as material accumulation and uneven drying, thereby improving drying quality and efficiency.

[0025] Furthermore, the surface of the mesh belt is coated with a polytetrafluoroethylene coating; and the mesh belt is also provided with a vibration motor to prevent powder from adhering.

[0026] The beneficial effect of adopting the above further solution is that it can effectively prevent powder materials from adhering to the mesh belt, ensuring the smooth progress of the drying process. The setting of the vibration motor enables the mesh belt to generate slight vibrations while conveying materials, further reducing the adhesion and accumulation of materials on the mesh belt.

[0027] A drying method of a multi-layer belt-type integrated powder drying and sorting device, utilizing the multi-layer belt-type integrated powder drying and sorting device, comprising the following steps: The material to be dried is transported to the receiving end of the uppermost mesh belt in the drying box through the feeding system; after the hot air closed circulation system is started, the heat pump unit generates heat through the refrigerant circulation, and transfers the heat to the air to form hot air. The hot air is sent into the bottom of the drying box through the blower, and the hot air is transported from bottom to top. The material is transported from top to bottom in an S-shaped manner through the multi-layer mesh belt, and the dried material is transported to the discharge port at the bottom of the drying box; the dehumidification fan of the hot air closed circulation system sends the moist hot gas into the air-to-air economizer to recover the waste heat; after the sorting machine is started, the material is sorted by the vibrating screen of the sorting machine, the screened material enters the finished product barrel, and the screened material enters the defective product collection box through the guide plate; after the blower is started, the leakage channel below the vibrating screen is subjected to air flow sorting.

[0028] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: 1. This invention utilizes a closed hot air circulation system. Heat is generated by a heat pump unit and delivered to the bottom of the drying chamber by a blower, achieving bottom-up conveyance of the hot air. This ensures that the material is fully exposed to the hot air as it is conveyed from top to bottom in an S-shaped pattern on the multi-layer mesh belt, achieving a fully efficient drying effect. Simultaneously, a dehumidification blower delivers the hot and humid gases generated during the drying process to an air-to-air economizer to recover waste heat, improving thermal energy utilization and reducing energy consumption.

[0029] 2. The separator enables the present invention to perform online material sorting during the drying process. The vibrating screen first performs preliminary sorting on the material, filtering out qualified small-size particles into the finished product barrel, while large, defective particles pass through the guide plate into the defective product collection box. When the blower is activated, airflow is sorted in the leakage channel below the vibrating screen, further separating materials of the same particle size but different specific gravities, achieving more refined sorting.

[0030] 3. The sealed design and negative pressure environment of the drying box effectively prevent the escape of powder during the drying process, avoiding material waste and environmental pollution. The filter cartridge and dust collection box in the sorting machine form a closed dust recovery path, further reducing dust pollution during the sorting process.

[0031] 4. The drying method of the present invention can adapt to the drying and sorting requirements of materials with different fluidity, particle size and specific gravity. By integrating drying and sorting functions, it reduces secondary processing steps and manual intervention in the production process, thereby reducing production costs. The efficient drying and online sorting mechanism also greatly improves production efficiency, enabling enterprises to respond to market demand more quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0033] Figure 1 This is a schematic diagram of the three-dimensional structure of the multi-layer belt-type powder drying and sorting integrated equipment of the present invention; Figure 2 A top view of the multi-layer belt-type powder drying and sorting integrated equipment of the present invention; Figure 3 A cross-sectional view of a separator of the multi-layer belt-type powder drying and sorting integrated equipment of the present invention; Figure 4 A perspective view of a sorting machine according to the present invention; Figure 5 Schematic diagram of the internal structure of the sorting machine of the present invention; Figure 6 A schematic diagram of the internal structure of the sorting machine of the present invention from another perspective; Figure 7 This is a schematic diagram of the structure of the angle adjuster of the present invention in the sorting box Figure 8 For the present invention Figure 6 A magnified view of part A; Figure 9 This is a diagram of the hot air closed circulation system of the multi-layer belt-type powder drying and sorting integrated equipment of the present invention; In the figure, 1. temporary storage box; 2. elevator; 3. material leveling machine; 4. drying box; 5. heat pump unit; 6. dust collector; 7. dehumidification fan; 8. sorting box; 801, observation window; 9. distribution box; 10. mesh belt; 11. air shutoff; 12. blower; 13. finished product barrel; 14. screen; 15. vibrator; 16. guide plate; 17. defective product collection box; 18. filter cartridge; 19. backflush system; 20. angle adjuster; 201. support plate; 202. vertical plate; 203. spring column; 204. arc-shaped long strip hole; 21. blower; 22. air collecting plate; 23. maintenance platform; 24. dust collection box. DETAILED DESCRIPTION

[0034] Component numbers herein, such as "first" and "second," are used solely to distinguish the components being described and do not imply any sequential priority or specific technical meaning. Furthermore, unless otherwise specified, the terms "connected" and "coupled" used in this application encompass both direct and indirect connections.

[0035] When interpreting the description of this application, it is important to clarify that the directions or positional relationships indicated by terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," and "counterclockwise" are based on the perspectives and layouts shown in the accompanying drawings and are intended to facilitate explanation and simplify the description process. They are not intended to be absolute limitations on the actual directions, constructions, and operating modes of the devices or components described. Therefore, these terms should not be construed as restrictive of the content of this application.

[0036] The principles and features of the present invention are described below with reference to examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0037] like Figure 1-Figure 3 As shown, a multi-layer belt powder drying and sorting integrated equipment includes a feeding system, a drying box 4, a hot air closed circulation system, a dust collector 6 and a sorting machine. The dust collector 6 is arranged at the exhaust port of the drying box 4. The drying box 4 is a sealed box with a negative pressure environment formed inside, and the discharge is fully sealed to prevent the powder from escaping during the drying process; multiple layers of mesh belts 10 are arranged at intervals from top to bottom inside the drying box 4, and the mesh belts 10 of each layer are transported in an S-shaped manner, and the receiving end of the lower mesh belt 10 is longer than the blanking end of the upper mesh belt 10, which increases the drying area, reduces the accumulation of materials, and makes the materials heated. More uniform; a feeding port is provided on the top of the drying box 4, and the feeding system is connected to the feeding port, for conveying the material to be dried into the drying box 4; a discharge port is provided at the bottom of the drying box 4, and the sorting machine is connected to the discharge port at the bottom of the drying box 4, so that the material can be sorted online during the drying process, and defective products and impurities can be separated in time; the hot air closed circulation system is used to supply heat to the drying box 4, and the hot air contacts the material in reverse from bottom to top. The hot air closed circulation system can also recover the heat in the moisture of the drying box 4, and realize the recycling of heat energy through the hot air closed circulation system.

[0038] like Figure 4-Figure 8As shown, the sorting machine includes a sorting box 8, a vibrating screen, a finished product barrel 13, a blower 12, and a multi-stage defective product collection box 17. The vibrating screen, finished product barrel 13, and multi-stage defective product collection box 17 are arranged within the sorting box 8, and the vibrating screen is located below the discharge port of the drying box 4. A blower 11 is provided at the discharge port at the bottom of the drying box 4 to control the discharge volume of the drying box 4. The finished product barrel 13 is located below the undersize outlet of the vibrating screen. The air outlet of the blower 12 is aligned with the leakage channel below the vibrating screen. The multi-stage defective product collection boxes 17 are arranged in sequence from near to far along the direction of the airflow generated by the blower 12. The oversize outlet of the vibrating screen is connected to one of the defective product collection boxes 17 via a guide plate 16. The synergistic effect of the vibrating screen and the airflow separation of the blower 12 enables dual sorting based on particle size and specific gravity. The vibrating screen first separates unqualified large particles, and then separates materials of the same particle size but different specific gravities using the wind speed gradient of the blower 12. The multi-stage defective collection box 17, combined with the wind speed of the blower 12, can classify materials based on their specific gravities, improving sorting accuracy and efficiency. Furthermore, in this embodiment, the vibrating screen employs a single-layer screen comprising a sieve hopper, a screen 14 disposed within the hopper, and a vibrator 15 disposed on the outer wall of the hopper.

[0039] The sorting box 8 is also equipped with one or more filter cartridges 18, located at the end of the blower 12's air path to prevent dust from escaping. A dust collection box 24 is also located below the filter cartridges 18. The dust collection box 24 and the filter cartridges 18 form a closed dust recovery path, preventing dust pollution during the sorting process and achieving a cleaner production environment. A backflush system 19 is also installed outside the sorting box 8 for pulse backflush of the filter cartridges 18 to prevent clogging.

[0040] The sorting machine also includes an angle adjuster 20, which includes a horizontally arranged support plate 201 and vertical plates 202 arranged on both sides of the support plate 201. The vertical plates 202 are provided with arc-shaped elongated holes 204. The vertical plates 202 are fixed to the sorting box 8 and located below the guide plate 16 through the arc-shaped elongated holes 204. One or more spring columns 203 are provided between the guide plate 16 and the support plate 201, and the ends of the spring columns 203 are respectively connected to the guide plate 16 and the support plate 201. The arc-shaped elongated holes 204 can be used to adjust the support height of the support plate 201, thereby adjusting the inclination angle of the guide plate 16 to meet the sorting requirements of materials with different fluidities. The damping effect of the spring columns 203 can eliminate high-frequency vibrations transmitted by the vibrating screen.

[0041] The sorting box 8 is also provided with an observation window 801, so that the operator can intuitively observe the sorting status of the materials in the sorting box 8, which helps to promptly discover problems that may occur during the sorting process, such as material blockage, reduced sorting efficiency, etc., so that measures can be taken quickly to make adjustments, thereby ensuring the smooth progress of the sorting process and the stability of the sorting quality.

[0042] The sorting box 8 is also provided with an air gathering plate 22 capable of adjusting the wind direction and wind speed of the blower 12. The air gathering plate 22 is arranged between the finished product barrel 13 and the defective product collection box 17. By adjusting the angle of the air gathering plate 22, the direction and speed of the airflow can be changed, affecting the distribution and intensity of the airflow generated by the blower 12 in the sorting area, thereby achieving indirect adjustment of the wind speed of the blower 12.

[0043] like Figure 9 As shown, the hot air closed circulation system includes a heat pump unit 5, a dehumidification fan 7, and a blower 21. The dehumidification fan 7 is connected to the exhaust port of the drying box 4 through a dehumidification duct, and is used to send the hot and humid gas in the drying box 4 into the heat pump unit 5 to recover the waste heat. The hot air generated by the heat pump unit 5 is sent to the bottom of the drying box 4 through the blower 21. By recovering the waste heat in the hot and humid gas, the heat pump unit 5 can generate hot air more efficiently, reducing the input of external energy and lowering the drying cost. In addition, the closed circulation system reduces the heat exchange between the drying box 4 and the external environment, helping to maintain the stability of the temperature and humidity in the drying box 4, thereby improving the drying quality and efficiency.

[0044] The heat pump unit 5 includes an air-to-air economizer, a compressor, a condenser, an expansion valve, and an evaporator, which are sequentially connected in a circular fashion. The air outlet of the dehumidification fan 7 is connected to the air-to-air economizer via a pipeline. The heat pump unit 5 is connected to the drying oven 4 via a closed circulation air duct and a blower 21. The air-to-air economizer more efficiently recovers waste heat from the hot and humid air and transfers it to the condenser, improving heat exchange efficiency. The closed circulation air duct reduces heat loss and the ingress of external impurities, ensuring stable operation of the heat pump unit 5.

[0045] The dust-laden gas outlet of the dust collector 6 is communicated with the exhaust port of the drying box 4, and the clean gas outlet of the dust collector 6 is connected to the dehumidifying fan 7 through a pipeline. The dust collector 6 can filter and remove the dust generated during the drying process.

[0046] The feeding system includes a temporary storage box 1, an elevator 2, and a material leveler 3. The temporary storage box 1 is located at the feed end of the elevator 2, and the material leveler 3 is located at the discharge end of the elevator 2. The discharge port of the temporary storage box 1 is equipped with a valve, and the discharge port of the material leveler 3 is connected to the feeding port of the drying box 4. The combination of the temporary storage box 1 and the elevator 2 enables the continuous and stable feeding of materials into the drying box 4, improving the degree of production automation. The use of the material leveler 3 ensures that the materials are evenly distributed when they are fed into the drying box 4, avoiding the problems of material accumulation and uneven drying, thereby improving the drying quality and efficiency.

[0047] The mesh belt 10 is coated with polytetrafluoroethylene and is also equipped with a vibration motor to prevent powder from adhering to the mesh belt 10. This effectively prevents powder from adhering to the mesh belt 10, ensuring a smooth drying process. The vibration motor allows the mesh belt 10 to generate slight vibrations while conveying material, further reducing material adhesion and accumulation on the mesh belt 10.

[0048] The multi-layer belt-type powder drying and sorting integrated equipment is also provided with a distribution box 9.

[0049] The multi-layer belt-type powder drying and sorting integrated equipment further includes a maintenance platform 23, which is arranged on the side of the drying box 4.

[0050] A drying method of a multi-layer belt-type powder drying and sorting integrated equipment, using the multi-layer belt-type powder drying and sorting integrated equipment, includes the following steps: the material to be dried is transported to the receiving end of the uppermost mesh belt 10 in the drying box 4 through the feeding system; after the hot air closed circulation system is started, the heat pump unit 5 generates heat through the refrigerant circulation and transfers the heat to the air to form hot air, and the hot air is sent into the bottom of the drying box 4 through the blower 21, and the hot air is transported from bottom to top. The material is transported from top to bottom in an S-shaped manner through the multi-layer mesh belt 10, and the dried material is transported to the discharge port at the bottom of the drying box 4; the dehumidification fan 7 of the hot air closed circulation system sends the moist hot gas into the air-to-air economizer to recover the waste heat; after the sorting machine is started, the material is sorted by the vibrating screen of the sorting machine, the screened material enters the finished product barrel 13, and the screened material enters the defective product collection box 17 through the guide plate 16; after the blower 12 is started, the leakage channel below the vibrating screen is air-sorted.

[0051] A closed hot air circulation system is employed, generating heat via a heat pump unit 5. This heat is then delivered to the bottom of the drying box 4 via a blower 21, achieving bottom-up transport of the hot air. This ensures that the material, as it is transported in an S-shaped pattern from top to bottom on the multi-layer mesh belt 10, is fully exposed to the hot air, achieving a fully efficient drying effect. Simultaneously, a dehumidification blower 7 feeds the hot, humid gases generated during the drying process into an air economizer to recover waste heat, improving thermal energy utilization and reducing energy consumption. The sorting machine enables in-line sorting of the material during the drying process. A vibrating screen first performs preliminary sorting, filtering qualified small-sized particles into the finished product drum 13, while larger, defective particles pass through a guide plate 16 and enter a defective product collection box 17. After the blower 12 is activated, airflow is applied to the leakage channel below the vibrating screen, further separating materials of the same particle size but different specific gravities, achieving more refined sorting. The sealed design and negative pressure environment of the drying box 4 effectively prevent powder from escaping during the drying process, avoiding material waste and environmental pollution. The filter cartridge 18 and the dust collection box 24 in the sorting machine form a closed dust recovery path, further reducing dust pollution during the sorting process.

[0052] The drying method of the present invention can adapt to the drying and sorting requirements of materials with different fluidity, particle size and specific gravity. By integrating drying and sorting functions, it reduces secondary processing steps and manual intervention in the production process, thereby reducing production costs. The efficient drying and online sorting mechanism also greatly improves production efficiency, enabling enterprises to respond to market demand more quickly.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-layer belt-type powder drying and sorting integrated equipment, characterized in that: It includes a feeding system, a drying box, a hot air closed circulation system, a dust collector and a sorting machine. The dust collector is arranged at the exhaust port of the drying box. The drying box is a sealed box with a negative pressure environment formed inside. Multiple layers of mesh belts are arranged at intervals from top to bottom inside the drying box. The mesh belts of each layer are transported in an S-shaped manner, and the receiving end of the lower mesh belt is longer than the blanking end of the upper mesh belt. A feeding port is provided at the top of the drying box, and the feeding system is connected to the feeding port for transporting the material to be dried into the drying box; a discharge port is provided at the bottom of the drying box, and the sorting machine is connected to the discharge port at the bottom of the drying box for sorting the dried material; the hot air closed circulation system is used to supply heat to the drying box and recover heat in the moisture in the drying box.

2. The multi-layer belt-type powder drying and sorting integrated equipment according to claim 1, characterized in that: The sorting machine includes a sorting box, a vibrating screen, a finished product barrel, a blower and a multi-stage defective product collection box. The vibrating screen, the finished product barrel and the multi-stage defective product collection box are arranged in the sorting box, and the vibrating screen is located below the discharge port of the drying box. The finished product barrel is arranged below the undersize material outlet of the vibrating screen. The blowing port of the blower is aligned with the leakage channel below the vibrating screen. The multi-stage defective product collection boxes are arranged in sequence from near to far along the direction of the airflow generated by the blower; the oversize material outlet of the vibrating screen is connected to one of the defective product collection boxes through a guide plate.

3. The multi-layer belt-type powder drying and sorting integrated equipment according to claim 2, characterized in that: One or more filter cartridges are further provided in the sorting box. The filter cartridges are provided at the end of the blowing path of the blower to prevent dust from overflowing. A dust collection box is also provided below the filter cartridges.

4. The multi-layer belt-type powder drying and sorting integrated equipment according to claim 3, characterized in that: The sorting machine also includes an angle adjuster, which includes a horizontally arranged support plate and vertical plates arranged on both sides of the support plate. The vertical plates are provided with arc-shaped long holes. The vertical plates are fixed in the sorting box through the arc-shaped long holes and are located below the guide plate. One or more spring columns are provided between the guide plate and the support plate, and the two ends of the spring columns are respectively connected to the guide plate and the support plate.

5. The multi-layer belt-type powder drying and sorting integrated equipment according to claim 4, characterized in that: An observation window is also provided on the sorting box, and a wind gathering plate capable of adjusting the wind direction and wind speed of the blower is also provided inside the sorting box.

6. The multi-layer belt-type integrated powder drying and sorting equipment according to any one of claims 1 to 5, characterized in that: The hot air closed circulation system includes a heat pump unit, a dehumidification fan and a blower. The dehumidification fan is connected to the exhaust port of the drying box through a dehumidification pipe, and is used to send the hot and humid gas in the drying box into the heat pump unit to recover waste heat. The hot air generated by the heat pump unit is sent to the bottom of the drying box through the blower.

7. The multi-layer belt-type powder drying and sorting integrated equipment according to claim 6, characterized in that: The heat pump unit includes an air-to-air economizer, a compressor, a condenser, an expansion valve and an evaporator. The air-to-air economizer, the compressor, the condenser, the expansion valve and the evaporator are connected in a cycle in sequence. The air outlet of the dehumidification fan is connected to the air-to-air economizer through a pipeline. The heat pump unit is connected to the drying box through a closed circulation air duct and a blower.

8. The multi-layer belt-type powder drying and sorting integrated equipment according to claim 6, characterized in that: The feeding system includes a temporary storage box, an elevator and a material leveler. The temporary storage box is arranged at the feeding end of the elevator, and the material leveler is arranged at the discharging end of the elevator. The discharge port of the temporary storage box is provided with a valve, and the discharge port of the material leveler is connected to the feeding port of the drying box.

9. The multi-layer belt-type powder drying and sorting integrated equipment according to claim 1, characterized in that: The surface of the mesh belt is coated with polytetrafluoroethylene; a vibration motor is also provided on the mesh belt to prevent powder from adhering.

10. A drying method for a multi-layer belt-type powder drying and sorting integrated equipment, characterized in that: The multi-layer belt-type powder drying and sorting integrated equipment according to any one of claims 1 to 9 comprises the following steps: The material to be dried is transported to the receiving end of the top mesh belt in the drying box through the feeding system; After the hot air closed circulation system is started, the heat pump unit generates heat through the refrigerant circulation and transfers the heat to the air to form hot air. The hot air is sent into the bottom of the drying box through the blower. The hot air is transported from bottom to top, and the material is transported from top to bottom in an S-shaped manner through the multi-layer mesh belt. The dried material is transported to the discharge port at the bottom of the drying box; The dehumidification fan of the hot air closed circulation system sends the hot and humid gas into the air-to-air economizer to recover the waste heat; after the sorting machine is started, the material is sorted by the vibrating screen of the sorting machine, the undersize material enters the finished product barrel, and the oversize material enters the defective product collection box through the guide plate; after the blower is started, the air flow is sorted in the leakage channel below the vibrating screen.

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