Particulate dehumidification system

Abstract

The utility model relates to dehumidification drying technical field, concretely relates to granule dehumidification system. Four sets of hot -blast drying system are made of, one set is main drying unit, and its discharge pipe is in parallel the suction material pipe of the remaining three sets of auxiliary drying system, realizes grading dehumidification. Hot -blast drying system contains drying cylinder, hot -blast interlayer, multilayer stirring mechanism, dehumidification dryer, hot -blast even wind chamber, vacuum feeding device and cyclone separator etc. Multilayer stirring mechanism is attached to the inner wall of drying cylinder and unloading cone section, and the paddle is long on the upper and short on the lower to prevent agglomeration and blockage. Hot -blast even wind chamber realizes hot -blast even distribution. Cyclone separator cooperates with powder recovery tank to realize fine powder closed loop reuse. Vacuum feeding device has blowback pipe, visual window and maintenance structure, which is convenient to maintain. The system is uniform, has good anti-blocking property, low material loss, stable operation, and suitable for continuous dehumidification of TPU and other easily sticking particles.

Description

Technical Field

[0001] This utility model relates to the field of dehumidification and drying technology, specifically to a particulate dehumidification system. Background Technology

[0002] During TPU granule processing, the moisture content within the granules directly affects the quality of subsequent molded products, easily causing problems such as bubbles, cracking, and dimensional instability. Traditional granule drying equipment mostly uses single-cylinder hot air drying, which has the following significant shortcomings: uneven distribution of hot air after entering the cylinder, easily forming airflow short circuits, with granules at the bottom of the cone section remaining statically piled up for a long time, resulting in insufficient drying and obvious dead zones; when the granules are highly viscous, they are prone to agglomeration and bridging on the inner wall of the feeding cone section and at the discharge port, causing material blockage and uneven flow, affecting continuous production; fine powder generated during the drying process is directly discharged with the hot and humid air, resulting in material waste, environmental pollution, and wear on pipelines and equipment; the vacuum feeding section lacks effective anti-clogging and visual observation structures, the filter is prone to clogging, and cleaning and maintenance are inconvenient.

[0003] Therefore, it is urgent to develop a particle dehumidification system that is uniformly dried, not prone to clogging, can recycle fine powder, and operates stably. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a particle dehumidification system that is uniformly dried, has no dead corners in the cone section, is not prone to material blockage, and allows for the recovery of powder.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The particle dehumidification system described in this utility model consists of four sets of hot air drying systems. One set of hot air drying systems serves as the main drying unit, and its discharge pipe is connected in parallel to the suction pipes of the other three sets of hot air drying systems to achieve pre-drying and secondary drying of the particles.

[0007] The hot air drying system includes a drying cylinder, which is divided into an upper drying cylinder body and a lower drying cylinder discharge cone section. A hot air jacket is provided on the outside of the drying cylinder for uniform wall heating of the particles inside. A multi-layer stirring mechanism is installed inside the drying cylinder. The stirring mechanism is arranged laterally close to the inner wall of the drying cylinder body and the discharge cone section, and extends longitudinally to the bottom discharge port. Inside the discharge cone section, the stirring paddles of the multi-layer stirring mechanism decrease in length from top to bottom, allowing them to conform to the cone surface contour and continuously agitate the accumulated particles within the cone section, preventing agglomeration and blockage.

[0008] The system is equipped with a dehumidifying dryer, which is connected to a hot air distribution chamber via pipes. The hot air distribution chamber is then connected to the bottom side of the drying cylinder. The hot air distribution chamber has tapered pipes at the top and bottom, with the diameter of the middle section being larger than that of the two ends. It is equipped with a uniformly distributed perforated plate inside to stabilize, rectify, and evenly distribute the hot air, ensuring that the hot air enters the cylinder with a stable airflow and avoiding airflow impact and deviation.

[0009] The top of the drying cylinder is connected to a cyclone separator via a hot and humid air outlet pipeline. The cyclone separator is equipped with a clean hot and humid air outlet pipeline. The cyclone separator is used to separate fine powder entrained in the hot and humid air. A powder recovery box is set at the bottom of the cyclone separator, and the recovered powder is sent back to the feed port of the vacuum feeding device through a powder recovery pipeline, realizing closed-loop powder recycling and reducing material loss.

[0010] A vacuum feeding device is installed at the top of the drying cylinder, comprising an upper vacuum feeder and a lower feeding mechanism. The vacuum feeder connects a suction pipe and a vacuum extraction pipe, with a filter installed on the vacuum extraction pipe. The filter is equipped with a backflush pipe for periodically cleaning the filter cake to prevent fine powder from clogging it. The vacuum feeder has a viewing window for easy observation of the internal feeding and filtration status. The feeding mechanism has a quick-opening maintenance door with a handwheel for easy and quick disassembly and cleaning, reducing maintenance difficulty.

[0011] The discharge port at the bottom of the drying cylinder is connected to the discharge pipe, which is equipped with a discharge solenoid valve. The suction pipes of the other three sets of hot air drying systems connected in parallel are also equipped with solenoid valves to realize automatic opening and closing of discharge and feeding and flow control, ensuring uniform and stable flow distribution in multiple branches.

[0012] The beneficial effects of this utility model are as follows:

[0013] (1) Cone-section fitting agitation completely eliminates the drying dead corner. The multi-layer agitation mechanism blades decrease in length from top to bottom in the feeding cone section, completely fitting the inner wall of the cone surface. This can continuously turn the bottom accumulated particles upwards, allowing them to continuously enter the hot air area, avoiding the problem of long-term static bottom of the cone and incomplete drying in traditional equipment, and significantly improving the drying uniformity.

[0014] (2) The hot air distribution chamber has uniform air distribution and higher dehumidification efficiency. The hot air enters the cylinder after being stabilized by the middle expansion section of the hot air distribution chamber and evenly distributed by the perforated plate. The airflow is stable and evenly distributed, avoiding hot air short circuit and local scouring caused by high-speed jet. The hot air can penetrate the material layer as a whole, resulting in more thorough dehumidification and lower energy consumption.

[0015] (3) Powder closed-loop recycling saves raw materials and protects the environment. The fine powder separated by the cyclone separator is sent back to the feeding system through the powder recycling box and powder recycling pipeline, and enters the drying cylinder together with the new material to achieve full recycling of fine powder, with no material waste, while avoiding dust overflow and pollution of the workshop environment.

[0016] (4) Vacuum feeding anti-clogging design makes operation more stable. The filter is equipped with a backflush pipe for automatic dust removal to prevent fine powder from adhering and clogging the screen. The viewing window can monitor the feeding status in real time. The unloading mechanism is equipped with a quick-opening door, making maintenance and cleaning quick and convenient, and greatly reducing the downtime failure rate.

[0017] (5) Multi-stage parallel flow diversion ensures continuous and stable production. The main drying system discharge pipe is connected to three sets of auxiliary drying systems in parallel. With the help of solenoid valves for precise control, particle grading and dehumidification are achieved. The feed of each branch is uniform, without deviation or blockage, making it suitable for continuous and large-scale production. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this invention. In the drawings:

[0019] Figure 1 This is a schematic diagram of the particulate dehumidification system described in this utility model;

[0020] Figure 2 This is a schematic diagram of the hot air drying system described in this utility model;

[0021] In the diagram: 1. Drying cylinder body; 2. Hot air jacket; 3. Vacuum feeder; 301. Vacuum extraction pipe; 302. Filter; 303. Backflush pipe; 304. Viewing window; 4. Cyclone separator; 5. Powder recovery box; 6. Dehumidifying dryer; 7. Hot air distribution chamber; 701. Uniformly distributed perforated plate; 8. Suction pipe; 9. Powder recovery pipe; 10. Discharge pipe; 1001. Discharge solenoid valve; 11. Drying cylinder discharge cone section; 12. Multi-layer stirring mechanism; 13. Discharge mechanism; 1301. Quick-opening maintenance door; 1302. Handwheel; 14. Hot and humid air outlet pipeline; 15. Clean hot and humid air discharge pipeline. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the embodiments.

[0023] Example

[0024] like Figures 1-2 As shown, the particle dehumidification system consists of four hot air drying systems, one of which serves as the main drying unit. Its discharge pipe 10 is connected in parallel to the suction pipes 8 of the other three hot air drying systems to achieve pre-drying and secondary drying of the particles.

[0025] The hot air drying system includes a drying cylinder, which is divided into an upper drying cylinder body 1 and a lower drying cylinder discharge cone section 11. A hot air jacket 2 is provided on the outside of the drying cylinder for uniform wall heating of the particles inside the cylinder. A multi-layer stirring mechanism 12 is provided inside the drying cylinder. The stirring mechanism is arranged laterally close to the inner wall of the drying cylinder body 1 and the discharge cone section, and extends longitudinally to the bottom discharge port. Inside the discharge cone section 11 of the drying cylinder, the stirring paddles of the multi-layer stirring mechanism 12 decrease in length from top to bottom, so that they can conform to the contour of the cone surface and continuously agitate the accumulated particles in the cone section to avoid agglomeration and blockage.

[0026] The system is equipped with a dehumidifying dryer 6, which is connected to a hot air distribution chamber 7 via a pipe. The hot air distribution chamber 7 is then connected to the bottom side of the drying cylinder. The hot air distribution chamber 7 has tapered pipes at the top and bottom, with the diameter of the middle section being larger than that of the two ends. It is equipped with a uniformly distributed perforated plate 701 inside, which is used to stabilize, rectify, and evenly distribute the hot air, so that the hot air enters the cylinder with a stable airflow and avoids airflow impact and deflection.

[0027] The top of the drying cylinder is connected to the cyclone separator 4 via a hot and humid air outlet pipeline 14. The cyclone separator 4 is equipped with a clean hot and humid air outlet pipeline 15. The cyclone separator 4 is used to separate the fine powder entrained in the hot and humid air. A powder recovery box 5 is set at the bottom of the cyclone separator 4, and the recovered powder is sent back to the feed port of the vacuum feeding device through the powder recovery pipeline 9 to realize the closed-loop recycling of powder and reduce material loss.

[0028] A vacuum feeding device is installed at the top of the drying cylinder, comprising an upper vacuum feeder 3 and a lower feeding mechanism 13. The vacuum feeder 3 connects to a suction pipe 8 and a vacuum extraction pipe 301. A filter 302 is installed on the vacuum extraction pipe 301, and the filter 302 is equipped with a backflush pipe 303 for periodically cleaning the filter cake to prevent fine powder from clogging it. The vacuum feeder 3 has a viewing window 304 for easy observation of the internal feeding and filtration status. The feeding mechanism 13 has a quick-opening maintenance door 1301, on which a handwheel 1302 is installed for easy and quick disassembly and cleaning, reducing maintenance difficulty.

[0029] The discharge port at the bottom of the drying cylinder is connected to the discharge pipe 10. The discharge pipe 10 is equipped with a discharge solenoid valve 1001. The suction pipes 8 of the other three sets of hot air drying systems connected in parallel are all equipped with solenoid valves to realize the automatic opening and closing of discharge and feeding and flow control, so as to ensure that the multi-branch flow is uniform and stable.

[0030] Working principle: First, the dehumidifier 6 is started. The dehumidifier 6 starts working and outputs low dew point constant temperature drying hot air. The hot air is transported to the hot air distribution chamber 7 through the pipeline. The hot air is stabilized in the middle expansion section of the hot air distribution chamber 7. After being rectified and evenly distributed by the internal evenly distributed perforated plate 701, it enters the bottom side of the drying cylinder with a stable upward airflow. At the same time, the hot air jacket 2 outside the drying cylinder is started simultaneously to uniformly heat the wall surface of the drying cylinder 1, providing a stable temperature environment for particle drying. Then, the vacuum feeding device is activated, and the vacuum extraction pipe 301 begins to draw in air, creating a stable negative pressure inside the vacuum feeder 3. The raw material particles are drawn into the vacuum feeder 3 by the negative pressure through the suction pipe 8. During the suction process, the filter 302 on the vacuum extraction pipe 301 intercepts fine powder entrained in the air, preventing fine powder from entering subsequent pipelines and damaging the equipment. The backflush pipe 303 periodically blows air in the opposite direction to the filter 302 to clean the filter cake adhering to the filter screen, avoiding filter screen blockage and affecting feeding efficiency. The operator can observe the internal particle feeding status and the filtration status of the filter 302 in real time through the viewing window 304 on the vacuum feeder 3. After being discharged from the vacuum feeder 3, the particles enter the lower feeding mechanism 13 and finally fall smoothly into the drying cylinder 1. After the particles enter the drying cylinder, the multi-layer stirring mechanism 12 is activated. The stirring mechanism rotates continuously, and its blades, which are laterally close to the inner wall of the drying cylinder body 1 and the feeding cone section 11, scrape off the particles adhering to the cylinder wall. At the same time, the blades in the feeding cone section 11, whose length decreases from top to bottom, continuously tumble the particles accumulated in the cone section, preventing particle agglomeration and bridging. The uniform hot air entering from the hot air distribution chamber 7 penetrates the particle layer from bottom to top, making full contact with the particles tumbled by the stirring mechanism, removing the moisture inside the particles, and achieving uniform drying. The hot air jacket 2 outside the drying cylinder continuously heats the cylinder wall, helping to increase the temperature inside the cylinder and ensuring a uniform and stable drying effect. The hot and humid air generated during the drying process carries a small amount of fine powder particles and enters the cyclone separator 4 through the hot and humid air outlet pipe 14 at the top of the drying cylinder. The cyclone separator 4 separates the fine powder entrained in the hot and humid air through centrifugal force. The fine powder falls into the powder recovery box 5 at the bottom under the action of gravity. Subsequently, the fine powder in the powder recovery box 5 is transported to the feed port of the vacuum feeding device through the powder recovery pipe 9, and enters the vacuum feeder 3 together with the newly entered raw material particles to realize the closed-loop recycling of fine powder and reduce material loss. The clean hot and humid air after separating the fine powder is discharged from the system through the clean hot and humid air discharge pipe 15 on the cyclone separator 4 to avoid polluting the workshop environment.After the granules in the main drying unit have completed pre-drying, the discharge solenoid valve 1001 on the discharge pipe 10 at the bottom of the drying cylinder is opened, and at the same time, the solenoid valves on the suction pipes 8 of the three auxiliary drying systems are opened. The pre-dried granules are evenly distributed through the discharge pipe 10 to the suction pipes 8 of the three auxiliary hot air drying systems. Each auxiliary hot air drying system repeats the above process of "hot air supply, granule drying, and fine powder recovery" to perform secondary dehumidification and drying on the distributed granules to ensure that the moisture content of the granules meets the process requirements. Throughout the process, the precise control of each solenoid valve ensures that the feed and discharge flow rates of the four hot air drying systems are uniform and stable, realizing continuous graded dehumidification of the granules. After the equipment has been running for a period of time, the maintenance quick-opening door 1301 can be opened through the handwheel 1302 on the feeding mechanism 13 to clean the residual granules and impurities inside the feeding mechanism 13. If the filter 302 is severely clogged, the relevant valves can be closed, and the filter can be thoroughly cleaned through the maintenance quick-opening door or the filter's own maintenance structure to ensure long-term stable operation of the system.

Claims

1. A particulate dehumidification system, characterized in that, It consists of four hot air drying systems. The discharge pipe (10) of one hot air drying system is connected in parallel to the suction pipes (8) of the other three hot air drying systems. The hot air drying system includes a drying cylinder, which includes a drying cylinder body (1) and a drying cylinder discharge cone section (11). The outer layer of the drying cylinder is provided with a hot air jacket (2). The drying cylinder is provided with a multi-layer stirring mechanism (12) inside. The multi-layer stirring mechanism (12) is arranged horizontally close to the inner wall of the drying cylinder body (1) and the drying cylinder discharge cone section (11), and extends vertically to the dry air cylinder body. The bottom outlet of the drying cylinder has a multi-layer stirring mechanism (12) with a decreasing length of the stirring paddle from top to bottom in the discharge cone section (11) of the drying cylinder; it also includes a dehumidifying dryer (6), which is connected to the bottom side of the drying cylinder through a pipe with a hot air equalization chamber (7), and the top of the drying cylinder is connected to a cyclone separator (4) through a hot and humid air outlet pipe (14), and the cyclone separator (4) is equipped with a clean hot and humid air outlet pipe (15); the top of the drying cylinder is equipped with a vacuum feeding device, and the vacuum feeding device is connected to a suction pipe (8).

2. The particulate dehumidification system according to claim 1, characterized in that, The bottom of the cyclone separator (4) is provided with a powder recovery box (5), which is connected to the inlet of the vacuum feeding device through a powder recovery pipe (9).

3. The particulate dehumidification system according to claim 1, characterized in that, The vacuum feeding device consists of a vacuum feeder (3) and a feeding mechanism (13) from top to bottom. The vacuum feeder (3) is connected to a suction pipe (8) and a vacuum extraction pipe (301). The vacuum feeder (3) is provided with a viewing window (304) and a filter (302) is provided on the vacuum extraction pipe (301).

4. The particulate dehumidification system according to claim 3, characterized in that, The filter (302) is provided with a backflush pipe (303).

5. The particulate dehumidification system according to claim 3, characterized in that, The feeding mechanism (13) has a quick-opening maintenance door (1301) and a handwheel (1302) is provided on the quick-opening maintenance door (1301).

6. The particulate dehumidification system according to claim 1, characterized in that, The hot air distribution chamber (7) has tapered pipes at the top and bottom, with the diameter of the middle layer pipe being larger than that of the pipes at both ends. The middle pipe is equipped with a uniformly distributed perforated plate (701).

7. The particulate dehumidification system according to claim 1, characterized in that, The discharge port at the bottom of the drying cylinder is connected to the discharge pipe (10), and the discharge pipe (10) is equipped with a discharge solenoid valve (1001). The suction pipes (8) of the other three sets of hot air drying systems connected in parallel are all equipped with solenoid valves.

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