Polyoxymethylene granules dryer with a drainage device

Abstract

The utility model relates to the field of plastic processing discloses a polyformaldehyde granule dryer with drainage device, including by flange connection in proper order feed section, drying section, cooling section and discharge section constitute drying cooling main part, drying cooling main part outside is provided with tail gas treatment subassembly and vibration subassembly, the inside of feed section is provided with cloth structure and lower feed port, and high low material level switch is installed on its side wall, the inside fixed connection of drying section has the heating plate group of heating source inlet and outlet subassembly, the inside fixed connection of cooling section has the cooling plate group of cold -source inlet and outlet subassembly, the even wind subassembly is provided between cooling section and discharge section. In the utility model, integrate drying and cooling procedure in vertical equipment, realize continuous production, reduce equipment space and investment, adopt plate indirect heat exchange, avoid material pollution, ensure purity, and accurate control temperature, prevent product degradation or yellowing, guarantee high quality.

Description

Technical Field

[0001] This utility model relates to the field of plastics processing, and in particular to a polyoxymethylene granule dryer with a diversion device. Background Technology

[0002] Polyoxymethylene (POM) is one of the world's five major engineering plastics (polyamide PA, polycarbonate PC, POM, thermoplastic polyester PBT, and polyphenylene oxide PPO). Due to its unique physical properties, it is known as "acetal" and plays an irreplaceable role in many fields. Currently, most domestic POM granule drying equipment uses trough drying devices or rotary rake drying devices. These types of drying devices suffer from problems such as large air volume, high investment in drying and exhaust gas purification equipment, long process flow, large footprint, low drying efficiency, high energy consumption, and a tendency to produce uneven drying. Therefore, a POM granule dryer with a diversion device is proposed to solve these problems. Utility Model Content

[0003] To overcome the above shortcomings, this utility model provides a polyoxymethylene granule dryer with a diversion device, which aims to improve the problems of excessive air volume, poor drying effect, high investment in exhaust gas purification equipment, lengthy process flow, large footprint, low drying efficiency, high energy consumption and uneven drying in the existing technology.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a polyoxymethylene granule dryer with a flow diversion device, comprising a drying and cooling body consisting of a feeding section, a drying section, a cooling section, and a discharging section connected sequentially by flanges; an exhaust gas treatment component and a vibration component are provided on the outside of the drying and cooling body; a material distribution structure and a lower feed inlet are provided inside the feeding section, and a high and low material level switch is installed on its side wall; a heating plate assembly with a heat source inlet and outlet assembly is fixedly connected inside the drying section; a cooling plate assembly with a cold source inlet and outlet assembly is fixedly connected inside the cooling section; an air distribution component is provided between the cooling section and the discharging section; the exhaust gas treatment component includes a cyclone separator and a bag filter; an exhaust port communicating with the exhaust gas treatment component is opened at the top of the feeding section; and the vibration component includes a rapping device fixedly connected to the outer wall of the discharging section. As a further description of the above technical solution: In the exhaust gas treatment assembly, the outlet end of the exhaust port is connected to the inlet end of the cyclone separator, and the outlet end of the cyclone separator is connected to the inlet end of the bag filter. As a further description of the above technical solution: Both the heating plate assembly and the cooling plate assembly are composed of multiple sets of vertically arranged heat exchange plates. As a further description of the above technical solution: The discharge section has a conical structure, with a flow equalization component inside and equipment support legs on the outside. The bottom of the section has a discharge port, and a rotary valve is installed at the discharge port. The rotary valve is electrically connected to the high and low level switch. As a further description of the above technical solution: The air distribution assembly consists of a main pipe and multiple branch pipes extending from it; As a further description of the above technical solution: The feeding section shell is equipped with an observation sight glass one, the drying section shell is equipped with an observation sight glass two, and the cooling section shell is equipped with an observation sight glass three; As a further description of the above technical solution: The drying and cooling main body is equipped with a temperature measuring port, the drying section shell is equipped with a material layer temperature measuring point, the cooling section shell is equipped with a material layer temperature measuring point, and the conical outer wall of the discharge section is equipped with a discharge temperature measuring point and multiple temperature monitoring points. As a further description of the above technical solution: The drying and cooling main body is provided with an inspection port, the shell of the drying section is provided with a quick-opening maintenance door one, and the shell of the cooling section is provided with a quick-opening maintenance door two.

[0005] This utility model has the following beneficial effects: 1. In this utility model, the two core processes of drying and cooling are highly integrated into a single vertical device, achieving continuous production. Compared with separate devices, its structure is more compact, simplifying the process flow and reducing the equipment footprint and initial investment cost. Secondly, by adopting a plate-type indirect heat exchange method, direct contact between the material and hot or cold media is avoided, fundamentally eliminating the risk of material contamination and ensuring product purity. At the same time, this gentle and efficient heat exchange method can precisely control the temperature of the material, effectively preventing the polyoxymethylene granules from degrading or yellowing due to local overheating, thus ensuring high product quality.

[0006] 2. In this utility model, the automatic adjustment of material height is achieved through the interlocking control of high and low material level switches and discharge valve, ensuring that the material has a stable and sufficient process residence time in the equipment. This is crucial for ensuring the consistency of drying and cooling effects, while reducing the need for manual operation and improving production reliability. In addition, the synergistic effect of the material distribution structure and the flow equalization component ensures that the material forms a uniform overall piston flow in the equipment, eliminating the phenomenon of flow deviation and making the processing effect of all materials highly consistent. The rapping device ensures continuous and smooth discharge, and the application of the exhaust gas treatment component not only recovers dust and reduces material loss, but also achieves clean emissions, meeting environmental protection requirements. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of a polyoxymethylene granule dryer with a flow guiding device proposed in this utility model.

[0008] Legend: 1. Air outlet; 2. Inspection port; 3. Lower feed inlet; 4. Temperature measuring port; 5. Fabric structure; 6. Sight glass one; 7. High and low material level switches; 8. Heat source inlet and outlet components; 9. Material layer temperature measuring point; 10. Heating plate assembly; 11. Maintenance quick-opening door one; 12. Sight glass two; 13. Discharge temperature measuring point; 14. Cold source inlet and outlet components; 15. Cooling plate assembly; 16. Maintenance quick-opening door two; 17. Sight glass three; 18. Air distribution assembly; 19. Equipment support legs; 20. Flow distribution assembly; 21. Vibrating device; 22. Temperature monitoring point; 23. Discharge port; 24. Cyclone separator; 25. Baghouse dust collector. Detailed Implementation

[0009] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0010] Reference Figure 1 This utility model provides an embodiment of a polyoxymethylene granular dryer with a flow guiding device. The dryer and cooling body comprises a feeding section, a drying section, a cooling section, and a discharging section connected sequentially by flanges. This design, integrating the two core processes of drying and cooling into a single body, achieves continuous material processing. It is not only compact and saves floor space but also simplifies the production process. The dryer and cooling body is externally equipped with an exhaust gas treatment component and a vibration component. The former is used to purify the dust-laden exhaust gas generated during the drying process to achieve environmentally friendly emissions, while the latter assists in the smooth discharge of materials. The feeding section is equipped with a material distribution structure 5 and a lower feed inlet 3. High and low level switches 7 are installed on its side walls. The lower feed inlet 3 receives wet material, while the material distribution structure 5 ensures the material is evenly distributed across the equipment's cross-section, laying the foundation for uniform heat exchange. The high and low level switches 7 monitor the material filling height in real time and are key sensors for automated control. The drying section is internally connected to a heating plate assembly 10 equipped with heat source inlet / outlet components 8. Its working principle is that the heat medium flows through the heat source inlet / outlet components 8 within the plate assembly, while the material falls through channels outside the plate assembly, undergoing efficient indirect heat exchange through the plate walls. This raises the material temperature and evaporates moisture and volatiles. This indirect heating method effectively prevents the material from being... In case of contamination or localized overheating, a cooling plate assembly 15 with a cold source inlet / outlet component 14 is fixedly connected inside the cooling section. Its working principle is similar to that of the drying section. The cold medium flows inside the plate assembly through the cold source inlet / outlet component 14, indirectly exchanging heat with the hot material falling from the outside, thereby rapidly reducing the material temperature to the packaging requirements and ensuring the stability of the final physical properties of the product. A uniform air distribution component 18 is installed between the cooling section and the discharge section. Its function is to introduce a small amount of gas, such as nitrogen, which flows counter-currently through the material layer from bottom to top, effectively carrying away the water vapor and volatiles evaporated from the drying section and discharging them through the air outlet 1 at the top. It plays a key role in guiding and purging. The exhaust gas treatment component includes a cyclone separator 24 and a bag filter 25. The top of the feeding section has an opening for connecting to the exhaust gas treatment component. The exhaust port 1, connected to the treatment components, is the only channel for the discharge of volatile gases and dust from inside the equipment. The vibration components include a rapping device 21 fixedly connected to the outer wall of the discharge section. This device effectively breaks up arching or bridging of materials within the cone hopper through intermittent high-frequency vibration, ensuring the continuity and stability of the discharge. In the exhaust gas treatment components, the outlet end of exhaust port 1 is connected to the inlet end of cyclone separator 24, and the outlet end of cyclone separator 24 is connected to the inlet end of bag filter 25. The beneficial effect of this two-stage dust removal design is that cyclone separator 24 first uses centrifugal force to efficiently remove larger dust particles from the exhaust gas, reducing the filtration load on the subsequent bag filter 25, while the bag filter 25 performs fine filtration of fine dust. The system employs a filtration mechanism to achieve efficient purification and environmentally friendly emissions. Both the heating plate assembly 10 and the cooling plate assembly 15 consist of multiple vertically arranged heat exchange plates. This structure increases the contact area and time between the material and the heat exchange surface, resulting in very high heat transfer efficiency. It enables thorough drying and cooling within a relatively short equipment height. The discharge section has a conical structure with an internal flow equalization component 20, external support legs 19, and a discharge port 23 at the bottom. The conical structure facilitates smooth material convergence towards the center, while the internal flow equalization component 20 further balances the falling speed of material in different areas, ensuring overall piston-like flow. The support legs 19 provide stable and reliable support for the entire heavy-duty equipment. A rotary valve is installed at the discharge port 23.The rotary valve is electrically connected to the high / low level switch 7, thus forming a closed-loop automatic control system: when the high / low level switch 7 detects that the material level has reached the upper limit, it outputs a signal to open the rotary valve to discharge material; when the material level drops to the lower limit, it controls the rotary valve to close, thereby precisely maintaining the amount of material in the equipment within a stable range and ensuring the residence time required by the process. The air distribution assembly 18 consists of a main pipe and multiple branch pipes extending from it. This structure can evenly distribute the introduced gas across the entire cross-section of the equipment, ensuring the uniformity of the purging airflow and avoiding inconsistent material processing effects caused by excessive or insufficient airflow in local areas. The feeding section shell is equipped with an observation mirror 1 6, the drying section shell is equipped with an observation mirror 2 12, and the cooling section shell is equipped with an observation mirror 3 17. These observation mirrors distributed in different sections provide operators with direct observation of the internal material flow. The display windows for dynamic status, color changes, and the presence of abnormalities are important auxiliary means of process monitoring. The drying and cooling main body is equipped with temperature measuring ports 4, and the drying section shell has material layer temperature measuring points 9 and 9 on its shell. The conical outer wall of the discharge section has discharge temperature measuring points 13 and multiple temperature monitoring points 22. These temperature measuring points, distributed throughout the key locations of the equipment, can collect real-time and accurate temperature data of the material at different stages of drying, cooling, and discharge, providing crucial evidence for precise control of process parameters and final evaluation of product quality. The drying and cooling main body is equipped with inspection ports 2, the drying section shell has a quick-opening maintenance door 11, and the cooling section shell has a quick-opening maintenance door 2 16. These port designs facilitate internal cleaning, component inspection, and daily maintenance, reducing downtime and improving equipment maintainability.

[0011] Working Principle: Wet polyoxymethylene granules enter the equipment through the bottom feed inlet 3 at the top. After entering, the material first passes through the cloth structure 5, which evenly disperses the material across the entire cross-section of the equipment to achieve uniform drying and cooling. Under the action of gravity, the material slowly moves downward and enters the drying section equipped with heating plate group 10. The heat medium from the external heat source enters the internal channel of the heating plate group 10 through the heat source inlet and outlet assembly 8. The material flows outside the plate group and undergoes indirect heat exchange through the plate wall, causing the volatile substances it contains to evaporate. The dried hot material continues to move downward and enters the cooling section equipped with cooling plate group 15. The cold medium from the external cold source enters the internal channel of the cooling plate group 15 through the cold source inlet and outlet assembly 14. The hot material also undergoes indirect heat exchange with the cooling plate group 15, causing its temperature to drop rapidly. At the air distribution assembly 18 at the bottom of the equipment, a small amount of gas is introduced from bottom to top to form a countercurrent with the falling material, blowing the volatiles evaporated in the drying section upward and discharging them through the air outlet 1 at the top. The discharged exhaust gas enters the exhaust gas... The processing components first pass through a cyclone separator 24 to remove larger dust particles, then enter a bag filter 25 for fine filtration before being discharged. The cooled material enters the conical discharge section at the bottom of the equipment. The flow equalization component 20 ensures that the material can flow smoothly to the central discharge port 23. The vibrating device 21 installed on the outer wall of the discharge section will work intermittently to prevent the material from arching. The core control of the entire equipment is the high and low material level switch 7 at the top, which monitors the material level in real time and automatically adjusts the opening and closing of the bottom rotary valve through interlocking control to keep the material level in the equipment within a stable range. During the entire operation, the operator can observe the flow state of the internal material through the observation mirror 1 6, observation mirror 2 12, and observation mirror 3 17 set on the equipment. Temperature measuring ports 4, material layer temperature measuring points 9, discharge temperature measuring points 13, and temperature monitoring points 22, which are located throughout the equipment, provide real-time temperature data. When it is necessary to clean or repair the equipment, the inside of the equipment can be easily accessed through the inspection port 2 and the maintenance quick-opening doors 11 and 216.

[0012] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A polyoxymethylene granule dryer with a flow guiding device, comprising a drying and cooling body consisting of a feeding section, a drying section, a cooling section, and a discharging section connected in sequence by flanges, characterized in that: The drying and cooling main body is equipped with an exhaust gas treatment component and a vibration component on its exterior. The feeding section is equipped with a cloth structure (5) and a lower feed port (3) inside. A high and low material level switch (7) is installed on its side wall. The drying section is fixedly connected with a heating plate group (10) equipped with a heat source inlet and outlet component (8). The cooling section is fixedly connected with a cooling plate group (15) equipped with a cold source inlet and outlet component (14). An air distribution component (18) is provided between the cooling section and the discharge section. The exhaust gas treatment component includes a cyclone separator (24) and a bag filter (25). The top of the feeding section is provided with an air outlet (1) that communicates with the exhaust gas treatment component. The vibration component includes a rapping device (21) fixedly connected to the outer wall of the discharge section.

2. The polyoxymethylene granule dryer with a flow guiding device according to claim 1, characterized in that: In the exhaust gas treatment assembly, the outlet end of the exhaust port (1) is connected to the inlet end of the cyclone separator (24), and the outlet end of the cyclone separator (24) is connected to the inlet end of the bag filter (25).

3. A polyoxymethylene granule dryer with a flow guiding device according to claim 1, characterized in that: Both the heating plate group (10) and the cooling plate group (15) are composed of multiple sets of vertically arranged heat exchange plates.

4. A polyoxymethylene granule dryer with a flow guiding device according to claim 1, characterized in that: The discharge section is a conical structure with a flow equalization component (20) inside and a support leg (19) on the outside. The bottom of the section has a discharge port (23). A rotary valve is installed at the discharge port (23). The rotary valve is electrically connected to the high and low level switch (7).

5. A polyoxymethylene granule dryer with a flow guiding device according to claim 1, characterized in that: The air distribution assembly (18) consists of a main pipe and multiple branch pipes extending from it.

6. A polyoxymethylene granule dryer with a flow guiding device according to claim 1, characterized in that: The feeding section shell is provided with an observation mirror one (6), the drying section shell is provided with an observation mirror two (12), and the cooling section shell is provided with an observation mirror three (17).

7. A polyoxymethylene granule dryer with a flow guiding device according to claim 1, characterized in that: The drying and cooling main body is provided with a temperature measuring port (4), the drying section shell is provided with a material layer temperature measuring point (9), the cooling section shell is provided with a material layer temperature measuring point (9), and the discharge section conical outer wall is provided with a discharge temperature measuring point (13) and multiple temperature monitoring points (22).

8. A polyoxymethylene granule dryer with a flow guiding device according to claim 1, characterized in that: The drying and cooling main body is provided with an inspection port (2), the shell of the drying section is provided with a maintenance quick-opening door one (11), and the shell of the cooling section is provided with a maintenance quick-opening door two (16).

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