Closed anti-crushing conveying device for polyoxymethylene powder
By designing a closed-loop circulation system and automated control, the problems of breakage and dust in the conveying of polyoxymethylene particles were solved, achieving full enclosure, reducing energy consumption and equipment wear, and improving production stability and product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- YANKUANG LUNAN CHEMICALS CO LTD
- Filing Date
- 2026-04-17
- Publication Date
- 2026-06-05
AI Technical Summary
During the conveying of polyoxymethylene granules, problems such as material breakage and dust, insufficient sealing, high energy consumption and equipment wear, and poor conveying stability make it difficult for existing technologies to achieve efficient, sealed, stable, and continuous production throughout the entire process.
Design a closed-loop system comprising a sending tank unit, a conveying pipeline unit, a receiving storage silo unit, and a gas return and balancing unit. Employ a sealed valve and flange structure, combined with a nitrogen closed-loop circulation, and utilize a fluidizing device, wear-resistant main pipe, and buffer layer. With PLC automatic control, achieve fully closed, low-speed dense phase conveying and gas recycling.
It achieves leak-free conveying of polyoxymethylene powder, clean workshop, and stable production safety, significantly reducing breakage rate and dust generation, lowering energy consumption and equipment maintenance costs, and improving product quality and production continuity.
Smart Images
Figure CN122144472A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of powder conveying technology, specifically to a closed, breakage-proof conveying device for polyoxymethylene powder. Background Technology
[0002] In the conveying and handling process of polyoxymethylene (POM) granules, the material generally suffers from the following problems due to its inherent characteristics (high hardness, good toughness but easy heat generation from friction) and the limitations of traditional conveying methods: Material breakage and dust issues: In traditional pneumatic conveying (such as dilute phase conveying) or mechanical conveying (such as screw conveyors and bucket elevators), high-speed collisions, friction, and compression occur between particles and between particles and pipe walls / equipment, leading to particle breakage and generating a large amount of dust and debris. This not only causes product loss and affects product purity and quality (such as causing "crystal points" in downstream products), but also increases the subsequent dust removal load and safety risks (dust explosion hazards). Insufficient airtightness: The existing conveying equipment has poor sealing at various connection points and pressure relief points, which leads to the escape of fine dust, polluting the workshop environment, endangering the health of operators, and causing material loss; High energy consumption and equipment wear: Dilute phase pneumatic conveying has high air velocity, high equipment resistance, and high energy consumption. At the same time, high-speed particles cause severe erosion and wear on pipe bends, valves, and other parts, resulting in short equipment service life and high maintenance costs. Poor conveying stability: Large fluctuations in conveying speed and concentration can easily lead to pipeline blockage or obstruction, affecting the stable operation of continuous production.
[0003] To address the aforementioned issues, while some existing technologies employ the concepts of dense-phase conveying or low-speed conveying, these technologies often involve complex equipment, poor adaptability to material properties (such as viscosity and hygroscopicity), or fail to achieve efficient and sealed operation throughout the entire process from sending to receiving, thus failing to meet the demands of continuous and stable production.
[0004] In view of this, we propose a closed, breakage-proof conveying device for polyoxymethylene powder. Summary of the Invention
[0005] The purpose of this invention is to provide a closed, breakage-proof conveying device for polyoxymethylene powder to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, the present invention provides the following technical solution: A closed, breakage-resistant conveying device for polyoxymethylene powder includes a sending tank unit, a conveying pipeline unit, a receiving and storage silo unit, a gas return and balancing unit, and a control system. The discharge end of the sending tank unit is sealed and fixedly connected to the inlet end of the conveying pipeline unit, the discharge end of the conveying pipeline unit is sealed and fixedly connected to the inlet end of the receiving and storage silo unit, the exhaust end of the receiving and storage silo unit is sealed and fixedly connected to the inlet end of the gas return and balancing unit, and the exhaust end of the gas return and balancing unit forms a closed loop with the sending tank unit. The control system is electrically connected to the sending tank unit, the conveying pipeline unit, the receiving and storage silo unit, and the gas return and balancing unit.
[0007] In a further embodiment, the sending tank unit includes a pressure sending tank, a feed valve is sealed and fixedly installed at the top inlet of the pressure sending tank, an exhaust filter is connected to the top exhaust end of the pressure sending tank through a pipeline, a fluidizing device is fixedly installed on the inner side of the bottom end of the pressure sending tank, the fluidizing device is connected to an external air supply device through a multi-head pipe, and a material valve is sealed and fixedly installed at the bottom outlet of the pressure sending tank.
[0008] In a further embodiment, the pressure sending tank is fixedly installed on the weighing module, and both the weighing module and the exhaust filter are fixedly installed on the first bracket. A tank pressure sensor is sealed and fixedly installed inside the arc-shaped side wall of the pressure sending tank. The weighing module and the tank pressure sensor are electrically connected to the control system to achieve a fully enclosed conveying process for polyoxymethylene powder, eliminating dust emission and safety hazards.
[0009] In a further embodiment, the conveying pipeline unit includes a wear-resistant main pipe, a large-radius wear-resistant elbow, and a pipeline pressure sensor. The large-radius wear-resistant elbow is sealed and fixedly connected to the turning position of the wear-resistant main pipe, and the pipeline pressure sensor is sealed and fixedly installed on the wear-resistant main pipe. The pipeline pressure sensor is electrically connected to the control system.
[0010] In a further embodiment, the wear-resistant main pipe is a smooth-walled ultra-high molecular weight polyethylene pipe or a ceramic-lined steel pipe, and the inner wall of the large-radius wear-resistant elbow is fixedly fitted with a buffer layer, thereby reducing material collision, friction and impact compression, significantly reducing powder breakage and dust generation, and improving product quality.
[0011] In a further embodiment, the receiving and storage silo unit includes a sealed receiving silo, the top of which is sealed and fixedly installed with a high-efficiency separation device via a pipeline, the top of which is sealed and fixedly installed with a level gauge, the bottom outlet of which is sealed and fixedly installed with a rotary discharge valve, the sealed receiving silo being fixedly installed on a second support, and the output end of the wear-resistant main pipe being sealed and fixedly installed inside the arc-shaped side wall at the top of the sealed receiving silo.
[0012] In a further embodiment, the high-efficiency separation device includes a cyclone separator and a bag filter. Both the cyclone separator and the bag filter are fixedly installed on a third bracket. The inlet of the cyclone separator is sealed and fixedly connected to the exhaust port at the top of the sealed receiving chamber through a pipeline. The outlet of the cyclone separator is sealed and fixedly connected in series with the inlet of the bag filter through a pipeline.
[0013] In a further embodiment, the gas return and balancing unit includes a gas return pipeline, a filter cooler, and a regulating valve. The filter cooler is sealed and fixedly installed on the gas return pipeline, and the regulating valve is sealed and fixedly installed at one end of the gas return pipeline near the sending tank unit. The regulating valve is electrically connected to the control system.
[0014] In a further embodiment, one end of the gas return pipe is sealed and fixedly connected to the exhaust port of the bag filter, and the other end of the gas return pipe is sealed and fixedly connected to the gas inlet of the multi-head pipe.
[0015] In a further embodiment, the control system adopts a PLC or DDS system. The control system includes a touch screen and a controller, which are electrically connected. The controller is electrically connected to the valves and sensors of the sending tank unit, the conveying pipeline unit, the receiving storage silo unit, and the gas return and balancing unit, respectively, to automatically regulate pressure, material level, and conveying parameters, thereby reducing external gas consumption and balancing equipment pressure.
[0016] Compared with the prior art, the present invention provides a closed, breakage-proof conveying device for polyoxymethylene powder, which has the following advantages: 1. This closed-loop, anti-breakage conveying equipment for polyoxymethylene powder aims to achieve a completely closed conveying process, eliminating dust dispersion and safety hazards. It consists of a sending tank unit, a conveying pipeline unit, a receiving storage silo unit, and a gas return and balancing unit, forming a closed-loop circulation circuit. Each connection part adopts a sealed valve and flange sealing structure, combined with nitrogen closed circulation, thereby achieving the effect of no leakage throughout the conveying process, clean and environmentally friendly workshop, and safe and stable production.
[0017] 2. This closed anti-breakage conveying equipment for polyoxymethylene powder aims to significantly reduce the breakage rate of polyoxymethylene powder during conveying and ensure particle integrity. It forms a low-speed dense phase material conveying system through a fluidization device, combined with a smooth and wear-resistant inner main pipe, a large-radius wear-resistant elbow, and a buffer layer. This reduces material collision, friction, and impact compression, significantly reducing powder breakage and dust generation, and improving product quality.
[0018] 3. This closed-loop anti-breakage conveying equipment for polyoxymethylene powder aims to reduce energy consumption, alleviate wear, and improve operational stability. It uses a gas return pipeline to return the filtered and cooled clean gas from the closed receiving chamber to the pressure sending tank for recycling. Combined with PLC automatic control of pressure, material level, and conveying parameters, it reduces external gas consumption, balances equipment pressure, avoids pipeline blockage and pulse conveying, and lowers energy consumption and equipment maintenance costs. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective; Figure 3 This is a first-view schematic diagram of a partial cross-sectional view of the structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram of region A in the middle; Figure 5 This is a schematic diagram of a cross-sectional view of part of the structure of the present invention from a second perspective; Figure 6 This is a schematic diagram of the large-radius wear-resistant elbow and its structural connection according to the present invention.
[0020] Explanation of icon numbers: 1. Sending tank unit; 11. Pressure sending tank; 111. Weighing module; 112. Tank pressure sensor; 12. Feed valve; 13. Exhaust filter device; 14. Fluidization device; 141. Multi-head pipe; 15. Material valve; 16. First support; 2. Conveying pipeline unit; 21. Wear-resistant main pipe; 22. Large radius wear-resistant elbow; 221. Buffer layer; 23. Pipeline pressure sensor; 3. Receiving and storage bin unit; 31. Sealed receiving bin; 32. High-efficiency separation device; 321. Cyclone separator; 322. Bag filter; 33. Level gauge; 34. Rotary discharge valve; 35. Second support; 36. Third support; 4. Gas return and balancing unit; 41. Gas return pipeline; 42. Filter cooler; 43. Control valve; 5. Control system; 51. Touch screen; 52. Controller. Detailed Implementation
[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0022] In this application, the term "above" indicates the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is primarily used to better describe this application and its embodiments, and is not intended to limit the indicated device, element, or component to having a specific orientation, or to construct and operate in a specific orientation. Furthermore, the term "above" may also be used in certain circumstances to indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances.
[0023] Please see Figures 1-6 The present invention provides a technical solution: A closed, breakage-resistant conveying device for polyoxymethylene powder includes a sending tank unit 1, a conveying pipeline unit 2, a receiving and storage bin unit 3, a gas return and balancing unit 4, and a control system 5. The discharge end of the sending tank unit 1 is sealed and fixedly connected to the inlet end of the conveying pipeline unit 2, the discharge end of the conveying pipeline unit 2 is sealed and fixedly connected to the inlet end of the receiving and storage bin unit 3, the exhaust end of the receiving and storage bin unit 3 is sealed and fixedly connected to the inlet end of the gas return and balancing unit 4, and the exhaust end of the gas return and balancing unit 4 forms a closed loop with the sending tank unit 1. The control system 5 is electrically connected to the sending tank unit 1, the conveying pipeline unit 2, the receiving and storage bin unit 3, and the gas return and balancing unit 4.
[0024] In one embodiment of the present invention, the sending tank unit 1 includes a pressure sending tank 11. The bottom of the pressure sending tank 11 is conical. A feed valve 12 is sealed and fixedly installed at the feed inlet at the top of the pressure sending tank 11. The exhaust end at the top of the pressure sending tank 11 is connected to an exhaust filter device 13 through a pipeline. A fluidizing device 14 is fixedly installed on the inner side of the bottom of the pressure sending tank 11. The fluidizing device 14 is connected to an external air supply device through a multi-head pipe 141. A material valve 15 is sealed and fixedly installed at the outlet at the bottom of the pressure sending tank 11. In addition, the pressure sending tank 11 is fixedly installed on a weighing module 111. The weighing module 111 and the exhaust filter device 13 are both fixedly installed on a first bracket 16. A tank pressure sensor 112 is sealed and fixedly installed inside the arc-shaped sidewall of the pressure sending tank 11. The weighing module 111 and the tank pressure sensor 112 are both electrically connected to the control system 5 to achieve a fully enclosed conveying process of polyoxymethylene powder, eliminating dust emission and safety hazards.
[0025] In one embodiment of the present invention, the conveying pipeline unit 2 includes a wear-resistant main pipe 21, a large-radius wear-resistant elbow 22, and a pipeline pressure sensor 23. The large-radius wear-resistant elbow 22 is sealed and fixedly connected to the turning position of the wear-resistant main pipe 21. The pipeline pressure sensor 23 is sealed and fixedly installed on the wear-resistant main pipe 21 and is electrically connected to the control system 5. In addition, the wear-resistant main pipe 21 is a smooth inner wall ultra-high molecular weight polyethylene pipe or a ceramic-lined steel pipe. The inner wall of the large-radius wear-resistant elbow 22 is fixedly fitted with a buffer layer 221, thereby reducing material collision friction and impact extrusion, significantly reducing powder breakage and dust generation, and improving product quality.
[0026] In one embodiment of the present invention, the receiving and storage bin unit 3 includes a sealed receiving bin 31 with a conical bottom. A high-efficiency separation device 32 is sealed and fixedly installed at the top of the sealed receiving bin 31 through a pipeline. A level gauge 33 is sealed and fixedly installed at the top of the sealed receiving bin 31. A rotary discharge valve 34 is sealed and fixedly installed at the bottom outlet of the sealed receiving bin 31. The sealed receiving bin 31 is fixedly installed on a second support 35. The output end of the wear-resistant main pipe 21 is sealed and fixedly installed inside the arc-shaped side wall at the top of the sealed receiving bin 31. In addition, the high-efficiency separation device 32 includes a cyclone separator 321 and a bag filter 322. Both the cyclone separator 321 and the bag filter 322 are fixedly installed on a third support 36. The inlet of the cyclone separator 321 is sealed and fixedly connected to the exhaust port at the top of the sealed receiving bin 31 through a pipeline. The outlet of the cyclone separator 321 and the inlet of the bag filter 322 are sealed and fixedly connected in series through a pipeline.
[0027] In one embodiment of the present invention, the gas return and balancing unit 4 includes a gas return pipe 41, a filter cooler 42, and a regulating valve 43. The filter cooler 42 is sealed and fixedly installed on the gas return pipe 41, and the regulating valve 43 is sealed and fixedly installed at one end of the gas return pipe 41 near the sending tank unit 1. The regulating valve 43 is electrically connected to the control system 5. In addition, one end of the gas return pipe 41 is sealed and fixedly connected to the exhaust port of the bag filter 322, and the other end of the gas return pipe 41 is sealed and fixedly connected to the gas replenishment port of the multi-head pipe 141.
[0028] In one embodiment of the present invention, the control system 5 adopts a PLC or DDS system. The control system 5 includes a touch screen 51 and a controller 52. The touch screen 51 and the controller 52 are electrically connected. The controller 52 is electrically connected to each valve and sensor of the sending tank unit 1, the conveying pipeline unit 2, the receiving storage silo unit 3, and the gas return and balancing unit 4, respectively, to automatically regulate the pressure, material level and conveying parameters, thereby reducing the consumption of external gas source and balancing the equipment pressure.
[0029] Working principle: Feeding stage: The control system 5 starts running and sends a feeding command to the sending tank unit 1. The feeding valve 12 receives the signal and opens. The exhaust filter device 13 starts to exhaust at the same time. The upstream polyoxymethylene powder enters the pressure sending tank 11. The exhaust filter device 13 discharges the air in the tank and prevents the powder from overflowing. The weighing module 111 continuously collects the weight signal of the material in the pressure sending tank 11 and transmits it to the control system 5. When the weight reaches the preset batch quantity, the control system 5 closes the feeding valve 12 and the exhaust filter device 13. The pressure sending tank 11 forms a completely sealed space, and the feeding process ends. Fluidization and pressurization stage: Control system 5 controls the opening of the air inlet valve, and the clean gas from the external air source and the return gas and balance unit 4 simultaneously enter the multi-head pipe 141, and then deliver it to the fluidization device 14 at the bottom of the pressure sending tank 11. The fluidization device 14 evenly distributes air to fully fluidize the powder in the tank. The tank pressure sensor 112 collects the pressure data in the tank in real time and feeds it back to the control system 5. The control system 5 continuously adjusts the air intake to maintain the pressure in the tank within the set range, providing stable power conditions for dense phase conveying. Dense phase conveying stage: Control system 5 opens material valve 15, fluidized polyoxymethylene powder forms a continuous and stable high-concentration material plug, enters the wear-resistant main pipe 21 of conveying pipeline unit 2, and is conveyed along the pipeline in a low-speed dense phase state. Pipeline pressure sensor 23 monitors the pressure fluctuation in wear-resistant main pipe 21 in real time and transmits the signal to control system 5. Control system 5 maintains the conveying pressure balance by adjusting the air intake and gas return flow to avoid material turbulence, pipeline blockage or impact breakage. The buffer layer 221 on the inner wall of the large radius wear-resistant elbow 22 buffers the material turning impact force and reduces the powder breakage rate. Gas-solid separation stage: The material plug is conveyed to the receiving and storage bin unit 3 through the wear-resistant main pipe 21 and enters the sealed receiving bin 31. The gas flows upward to the high-efficiency separation device 32. The cyclone separator 321 uses centrifugal force to separate most of the polyoxymethylene powder and let it fall back to the bottom of the sealed receiving bin 31. The gas containing trace amounts of powder enters the bag filter 322 for deep filtration. The bag filter 322 intercepts the residual fine powder in the gas, realizing efficient gas-solid separation. The clean gas after separation enters the subsequent circulation process. Gas circulation and temperature control stage: The clean gas discharged from the bag filter 322 enters the gas return pipe 41 of the gas return and balance unit 4. It first undergoes secondary filtration and cooling treatment by the filter cooler 42 to remove trace impurities in the gas and control the temperature within a suitable range to avoid thermal degradation of the powder due to high temperature. The cooled and filtered clean gas flows through the regulating valve 43. The control system 5 precisely adjusts the return gas flow and pressure through the regulating valve 43 according to the pressure in the pressure sending tank 11 and the delivery requirements. The clean gas flows back to the pressure sending tank 11 through the multi-head pipe 141 as a fluidization and back pressure compensation gas source. Excess clean gas is discharged through the safety pressure relief channel to meet the standards, forming a closed gas circulation loop and reducing the consumption of external gas sources. Closed unloading stage: The level gauge 33 at the top of the closed receiving silo 31 monitors the material level in the silo in real time. When the material level reaches the set upper limit value, the level gauge 33 transmits the signal to the control system 5. The control system 5 opens the rotary unloading valve 34 and smoothly conveys the powder to the downstream production process while maintaining a slight positive pressure in the closed receiving silo 31. When the material level drops to the set lower limit value, the control system 5 closes the rotary unloading valve 34 to maintain a closed environment and stable pressure in the silo. Cycle completion and safety monitoring phase: When the weighing module 111 at the bottom of the pressure conveying tank 11 detects that the material in the tank has been completely conveyed and the weight has reached the lower limit, it sends a conveying completion signal to the control system 5. The control system 5 then sequentially closes the material valve 15 and the air inlet valve, and the single conveying cycle is completely completed. It can then receive instructions to enter the next round of conveying process. During operation, the tank pressure sensor 112, pipeline pressure sensor 23, and level gauge 33 continuously collect operating parameters. If faults such as abnormal pressure, excessive material level, or excessive temperature occur, the control system 5 immediately issues an alarm signal and executes a safety shutdown procedure, locking all valves and power components to ensure the safety of the equipment and materials.
[0030] All standard parts used in this application can be purchased from the market. The specific connection methods of each part are all conventional methods such as riveting and welding that are mature in the prior art. The standard parts are all conventional models in the prior art. The circuit connection adopts conventional connection methods in the prior art, and will not be described in detail here.
[0031] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.
[0032] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.
Claims
1. A closed, breakage-proof conveying device for polyoxymethylene powder, characterized in that: The system includes a sending tank unit (1), a conveying pipeline unit (2), a receiving storage bin unit (3), a gas return and balancing unit (4), and a control system (5). The discharge end of the sending tank unit (1) is sealed and fixedly connected to the inlet end of the conveying pipeline unit (2). The discharge end of the conveying pipeline unit (2) is sealed and fixedly connected to the inlet end of the receiving storage bin unit (3). The exhaust end of the receiving storage bin unit (3) is sealed and fixedly connected to the air inlet end of the gas return and balancing unit (4). The exhaust end of the gas return and balancing unit (4) forms a closed loop with the sending tank unit (1). The control system (5) is electrically connected to the sending tank unit (1), the conveying pipeline unit (2), the receiving storage bin unit (3), and the gas return and balancing unit (4), respectively.
2. The closed, breakage-proof conveying equipment for polyoxymethylene powder according to claim 1, characterized in that: The sending tank unit (1) includes a pressure sending tank (11). A feed valve (12) is sealed and fixedly installed at the top inlet of the pressure sending tank (11). An exhaust filter device (13) is connected to the top exhaust end of the pressure sending tank (11) through a pipeline. A fluidizing device (14) is fixedly installed on the inner side of the bottom end of the pressure sending tank (11). The fluidizing device (14) is connected to an external air supply device through a multi-head pipe (141). A material valve (15) is sealed and fixedly installed at the bottom outlet of the pressure sending tank (11).
3. The closed, breakage-proof conveying equipment for polyoxymethylene powder according to claim 2, characterized in that: The pressure sending tank (11) is fixedly installed on the weighing module (111). The weighing module (111) and the exhaust filter device (13) are both fixedly installed on the first bracket (16). The tank pressure sensor (112) is sealed and fixedly installed inside the arc-shaped side wall of the pressure sending tank (11). The weighing module (111) and the tank pressure sensor (112) are both electrically connected to the control system (5).
4. The closed, breakage-proof conveying equipment for polyoxymethylene powder according to claim 2, characterized in that: The conveying pipeline unit (2) includes a wear-resistant main pipe (21), a large-radius wear-resistant elbow (22), and a pipeline pressure sensor (23). The large-radius wear-resistant elbow (22) is sealed and fixedly connected to the turning position of the wear-resistant main pipe (21). The pipeline pressure sensor (23) is sealed and fixedly installed on the wear-resistant main pipe (21). The pipeline pressure sensor (23) is electrically connected to the control system (5).
5. The closed, breakage-proof conveying device for polyoxymethylene powder according to claim 4, characterized in that: The inner wall of the large-radius wear-resistant elbow (22) is fixedly fitted with a buffer layer (221).
6. The closed, breakage-proof conveying device for polyoxymethylene powder according to claim 4, characterized in that: The receiving and storage bin unit (3) includes a sealed receiving bin (31). A high-efficiency separation device (32) is sealed and fixedly installed at the top of the sealed receiving bin (31) through a pipeline. A level gauge (33) is sealed and fixedly installed at the top of the sealed receiving bin (31). A rotary discharge valve (34) is sealed and fixedly installed at the bottom outlet of the sealed receiving bin (31). The sealed receiving bin (31) is fixedly installed on the second bracket (35). The output end of the wear-resistant main pipe (21) is sealed and fixedly installed inside the arc-shaped side wall at the top of the sealed receiving bin (31).
7. The closed, breakage-proof conveying device for polyoxymethylene powder according to claim 6, characterized in that: The high-efficiency separation device (32) includes a cyclone separator (321) and a bag filter (322). Both the cyclone separator (321) and the bag filter (322) are fixedly installed on the third bracket (36). The inlet of the cyclone separator (321) is sealed and fixedly connected to the exhaust port at the top of the sealed receiving chamber (31) through a pipeline. The outlet of the cyclone separator (321) and the inlet of the bag filter (322) are sealed and fixedly connected in series through a pipeline.
8. The closed, breakage-proof conveying device for polyoxymethylene powder according to claim 7, characterized in that: The gas return and balance unit (4) includes a gas return pipe (41), a filter cooler (42), and a regulating valve (43). The filter cooler (42) is sealed and fixedly installed on the gas return pipe (41). The regulating valve (43) is sealed and fixedly installed at one end of the gas return pipe (41) near the sending tank unit (1). The regulating valve (43) is electrically connected to the control system (5).
9. The closed, breakage-proof conveying device for polyoxymethylene powder according to claim 8, characterized in that: One end of the gas return pipe (41) is sealed and fixedly connected to the exhaust port of the bag filter (322), and the other end of the gas return pipe (41) is sealed and fixedly connected to the gas supply port of the multi-head pipe (141).
10. The closed, breakage-proof conveying device for polyoxymethylene powder according to claim 1, characterized in that: The control system (5) adopts a PLC or DDS system. The control system (5) includes a touch screen (51) and a controller (52). The touch screen (51) and the controller (52) are electrically connected. The controller (52) is electrically connected to each valve and sensor of the sending tank unit (1), the conveying pipeline unit (2), the receiving storage bin unit (3), and the gas return and balance unit (4).