Closed dust removal and recovery equipment for powder packaging

Abstract

The application provides a closed dust removal and recovery equipment for powder packaging, and mainly relates to the field of powder separation and dust removal. The closed dust removal and recovery equipment for powder packaging comprises a packaging box and a stock bin. A feeding pipe for material falling is arranged at the bottom of the stock bin. The end horizontal section of the feeding pipe is located in the packaging box. A negative pressure mechanism is arranged outside the packaging box. The negative pressure mechanism comprises a negative pressure fan and a buffer cavity. The buffer cavity has an air inlet, an air outlet and a discharge port. The air inlet is connected with the inside of the packaging box through a pipeline. A control valve is arranged on the feeding pipe. A weighing mechanism is arranged at the bottom of the packaging box. A sliding mechanism is arranged at the front side of the packaging box. A sleeving mechanism is arranged on the sliding mechanism. The application has the beneficial effect that the application can realize the whole closed and cooperative operation of the packaging, conveying and dust removal links.

Description

Technical Field

[0001] This invention mainly relates to the field of powder separation and dust removal, specifically a closed dust removal and recycling device for powder packaging. Background Technology

[0002] Silica, as a high-performance and widely used inorganic functional material, plays an indispensable role in many key fields such as rubber, coatings, food, and pharmaceuticals due to its excellent wear resistance, high-temperature resistance, insulation, and reinforcing properties. In the silica production process, the industry commonly employs a combination of negative pressure conveying and sealed packaging. Negative pressure conveying enables efficient and continuous transport of silica materials, reducing material residue during transport, while sealed packaging aims to isolate the material from external environmental contamination and ensure product purity. However, in actual packaging operations, due to the fine particle size, large specific surface area, and high fluidity of silica, a large amount of fine dust is inevitably generated.

[0003] The generation of these fine dust particles has multiple negative impacts, severely hindering the improvement of quality and efficiency and the green development of silica production. From an environmental perspective, the released dust floats in the air of the production workshop, and long-term accumulation not only pollutes the production environment and affects the cleanliness of the workshop, but may also spread to the surrounding environment, posing a potential threat to the ecological environment. From a personnel health perspective, long-term inhalation of fine silica dust by operators can cause serious damage to the respiratory system, increasing the risk of occupational diseases such as pneumoconiosis, threatening the health and safety of operators. From a production efficiency perspective, fine dust easily adheres to the inner walls of packaging equipment, conveying pipelines, and workshop floors due to electrostatic adsorption. At the same time, under the influence of airflow disturbances, some dust will escape to the outside of the packaging system, leading to an increase in material loss rate and directly reducing product yield.

[0004] Based on the aforementioned issues, efficient collection and treatment of fine dust generated during the silica encapsulation process has become a crucial measure to ensure the cleanliness of the encapsulation environment, protect the health of operators, and improve product yield and quality stability. It is also an inevitable requirement for promoting the green and standardized development of the silica production industry. However, the dust removal equipment currently used in the industry still has significant limitations and cannot meet the actual needs of efficient dust collection during the encapsulation process.

[0005] Most existing dust collection equipment adopts an open structure design, essentially serving as external auxiliary equipment for the packaging mechanism rather than an integrated design with the packaging system. The working principle of this open-type dust collection equipment involves setting up a dust suction device outside the packaging equipment to capture escaped dust through negative pressure adsorption. However, due to the gaps between it and the packaging system, and its inability to cover the entire packaging process, it is difficult to achieve a closed-loop coordinated operation of packaging, conveying, and dust collection. In actual operation, when the packaging equipment is opened, material conveying is switched, or the lid is opened after packaging, a large amount of dust still escapes from the gaps, resulting in low dust collection efficiency and a persistently high risk of dust escape. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a closed-loop dust removal and recycling device for powder packaging, which enables fully enclosed and coordinated operation of the packaging, conveying, and dust removal processes.

[0007] To achieve the above objectives, the present invention employs the following technical solution: A closed-loop dust collection and recycling device for powder packaging includes a packaging box and a hopper. The packaging box has a door on its front side and is a sealed box. The hopper is located above the packaging box, and a feeding pipe for material discharge is provided at the bottom of the hopper. The feeding pipe includes a vertical section and a horizontal section connected in an L-shape. The horizontal section at the end of the feeding pipe is located inside the packaging box. A negative pressure mechanism is provided on the outside of the packaging box. The negative pressure mechanism includes a negative pressure fan and a buffer chamber. A filter bag is placed inside the buffer chamber, which has an air inlet, an air outlet, and a material outlet. The air outlet is connected to a negative pressure fan. The air inlet is connected to the inside of the packaging box through a pipeline. The material outlet is connected to a feeding pipe. A control valve is installed on the feeding pipe to control the alternating conduction of the feeding pipe and the material outlet. A weighing mechanism is installed at the bottom of the packaging box. A sliding mechanism is installed on the front side of the packaging box. A fitting mechanism is installed on the sliding mechanism. A linear drive mechanism is installed on one side of the sliding mechanism. A fitting tube is installed on the fitting mechanism. When the linear drive mechanism drives the fitting mechanism to move inward, the fitting tube connects with the end of the feeding pipe.

[0008] Preferably, the inner wall of the packaging box has a sandwich cavity, the air inlet is connected to the sandwich cavity through an air inlet pipe, and a plurality of evenly distributed air suction holes are arranged in an array on the sandwich cavity, the air suction holes extending into the inner cavity of the packaging box.

[0009] Preferably, the bottom surface of the air intake hole has an inclined structure facing the packaging box.

[0010] Preferably, the weighing mechanism includes a lifting mechanism and a weighing platform. The lifting mechanism is used to lift the weighing platform to support the packaging bag, and a weighing sensor is provided at the bottom of the weighing platform.

[0011] Preferably, the buffer cavity is sleeved on the outside of the feeding pipe, and multiple discharge ports are provided, which are evenly arranged in a circle around the side wall of the feeding pipe.

[0012] Preferably, the bottom surface of the buffer cavity has a tapered structure facing the feed pipe.

[0013] Preferably, a shielding frame is provided inside the feeding pipe, and the control valve is rotatably positioned below the shielding frame. The shielding frame has several circumferentially arranged discharge ports. The control valve includes a valve plate and a driving mechanism. The valve plate has a mating interface corresponding to each discharge port, and the outer wall of the valve plate has a mating groove corresponding to each discharge port. When the valve plate is driven by the driving mechanism to rotate to a first preset angle, each mating interface completely overlaps with the corresponding discharge port, connecting the upstream and downstream of the feeding pipe. At this time, the discharge port is blocked. When the valve plate is driven by the driving mechanism to rotate to a second preset angle, each mating groove completely overlaps with the corresponding discharge port, connecting the downstream of the feeding pipe with the buffer chamber. At this time, the upstream and downstream of the feeding pipe are cut off.

[0014] Preferably, clamping cylinders are provided on both sides of the sleeve tube, and the piston rod of the clamping cylinder is provided with an arc-shaped clamping block that matches the outer surface of the sleeve tube.

[0015] Preferably, the sleeve is fitted onto the end of the feeding pipe, and the rear end of the sleeve is sealed to the feeding pipe.

[0016] Preferably, the filter bag is a detachable filter bag assembly, and a pulse backflushing mechanism is provided at the top of the buffer chamber.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This invention achieves closed-loop suppression of dust and zero-loss quantitative delivery of materials throughout the packaging process through coordinated airflow control and precise mechanical linkage. It integrates the dust removal mechanism and packaging equipment into a whole, reducing dust dispersion and improving dust removal efficiency.

[0018] The valve plate dual-mode precise switching mechanism of the present invention ensures strict separation of feeding and discharging, avoiding cross-contamination and metering errors. The coordinated design of the conical buffer chamber and the circumferential discharge port significantly improves the falling efficiency of the material after settling.

[0019] By combining the inclined suction holes with the pressure equalization and flow guiding structure of the interlayer cavity, the airflow uniformity and dust collection efficiency are further optimized, effectively preventing dust escape caused by local eddies.

[0020] Furthermore, the combined use of the lifting and weighing mechanism and the clamping cylinder ensures stable positioning and reliable sealing of the packaging bags during the filling process, significantly reducing the risk of material leakage due to bag movement or inadequate sealing. Simultaneously, the detachable filter bag assembly, in conjunction with the pulse backflushing mechanism, enables online self-cleaning of the filter unit, ensuring the stability of the equipment's filtration performance during long-term continuous operation. Attached Figure Description

[0021] Appendix Figure 1 This is a schematic diagram of the structure from the main viewpoint of the present invention; Appendix Figure 2 This is a schematic diagram of the left-view structure of the present invention; Appendix Figure 3 This is a three-dimensional structural diagram of the packaging box of the present invention; Appendix Figure 4 This is a schematic diagram of the packaging box structure from the main view perspective of the present invention; Appendix Figure 5 This is a schematic cross-sectional view of the buffer cavity structure of the present invention; Appendix Figure 6 This is a schematic diagram of the filter bag installation structure of the present invention; Appendix Figure 7 This is a schematic diagram of the top view of the buffer cavity structure of the present invention; Appendix Figure 8 This is a schematic diagram of the bottom structure of the buffer cavity of the present invention; Appendix Figure 9 This is the present invention. Figure 3 A magnified schematic diagram of part A in the middle.

[0022] The following are the labels in the attached diagram: 1. Packaging box; 11. Box door; 12. Weighing mechanism; 121. Lifting mechanism; 122. Weighing platform; 13. Interlayer cavity; 2. Hopper; 21. Feeding pipe; 22. Control valve; 221. Valve plate; 222. Drive mechanism; 223. Connecting interface; 224. Connecting groove; 225. Ring plate; 23. Material shielding frame; 231. Material drop port; 3. Negative pressure mechanism; 31. Negative pressure fan; 32. Buffer chamber; 33. Filter bag; 34. Support ring; 4. Set-in mechanism; 41. Sliding mechanism; 42. Linear drive mechanism; 43. Set-in tube; 44. Pressing cylinder; 45. Arc-shaped pressing block. Detailed Implementation

[0023] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined in this application.

[0024] like Figure 1-9As shown, the closed dust removal and recycling equipment for powder packaging according to the present invention includes a packaging box 1 and a hopper 2. The packaging box 1 serves as the core area for powder packaging operations, and integrates a weighing mechanism and a negative pressure dust removal system inside. The hopper 2 is located above the packaging box and is connected to the packaging box 1 via a feeding pipe 21. The hopper 2 is connected to a negative pressure feeding system, through which the powder is transported from the finished product end to the hopper 2 for temporary storage, and then quantitatively fed into the packaging box 1 via the feeding pipe 21.

[0025] The packaging box 1 has a door 11 on the front side. The door 11 adopts a pneumatic quick-opening structure and is embedded with a silicone sealing strip that is resistant to powder wear, thereby sealing the packaging box 1 into a sealed box to ensure that no dust spills out during the entire operation. The opening and closing of the door 11 is precisely controlled by a PLC program. The opening and closing cycle is strictly synchronized with the three stages of weighing, packaging and dust removal. The opening and closing operation of the door 11 can be manually controlled by the operator. The opening of the door 11 can also be automatically triggered by real-time data from the weighing sensor.

[0026] The bottom of the hopper 2 is equipped with a feeding pipe 21 for material discharge. The feeding pipe 21 includes a vertical section and a horizontal section connected in an L-shape. Through the natural fall of the powder due to gravity and the precise guidance of the horizontal section, the powder is transported without disturbance and with low dust. The horizontal section at the end of the feeding pipe 21 is located inside the packaging box 1. By fitting a self-sealing bag to the end of the feeding pipe 21, the powder can be sealed.

[0027] A negative pressure mechanism 3 is installed on the outside of the packaging box 1. The negative pressure mechanism 3 includes a negative pressure fan 31 and a buffer chamber 32. Filter bags 33 are installed inside the buffer chamber 32. The buffer chamber 32 has an air inlet, an air outlet, and a discharge outlet. The air outlet is connected to the negative pressure fan 31, and the air inlet is connected to the dust removal port on the top of the packaging box 1 through a pipeline. The air inlet is located at the top of the buffer chamber 32. Filter bags 33 are spaced between the air inlet and the air outlet to form an airflow channel. In this embodiment, the filter bags 33 have a ring structure. A support ring 34 with several openings is provided inside the buffer chamber 32, and the filter bags 33 are secured to the support rings by reinforcing rings. During filtration, the airflow passes through the openings and is trapped inside the aluminum material by the filter bags 33. The filter bags 33 ensure that the airflow penetrates the filter material evenly without causing local blockage. The discharge port is located at the bottom of the buffer chamber 32 and is connected to the feeding pipe 21, so that the recovered powder can be directly returned to the feeding pipe 21 after gravity settling, realizing the closed-loop recycling of the powder.

[0028] The filter bag 33 is a detachable filter bag assembly, facilitating regular replacement and cleaning. In this embodiment, the filter bag 33 uses a high-temperature resistant and antistatic polyester fiber composite filter material, which is tensioned on a ring-shaped frame to separate the air inlet and outlet. This installation structure facilitates disassembly and maintenance and effectively prevents the filter material from collapsing or deforming.

[0029] Furthermore, a pulse backflushing mechanism is provided at the top of the buffer chamber 32, with its nozzle facing the surface of the filter bag 33. The compressed air pulse is triggered by the control device at a set cycle to remove the powder adhering to the surface of the filter bag 33, so that the filter bag 33 always maintains high air permeability and filtration accuracy.

[0030] A control valve 22 is installed on the feeding pipe 21 to control the alternating flow between the feeding pipe 21 and the discharge port. In this embodiment, a buffer chamber 32 is sleeved on the outside of the feeding pipe 21, and multiple discharge ports are provided, which are evenly arranged circumferentially around the side wall of the feeding pipe 21. The bottom surface of the buffer chamber 32 has a conical structure facing the feeding pipe 21, which can effectively guide the settled powder to slide down the conical surface to each discharge port, ensuring that the powder is free of residue and flows back to the feeding pipe 21 with high efficiency.

[0031] A material shielding frame 23 is installed inside the feeding pipe 21. The material shielding frame 23 has a cross-shaped structure, with its four ends embedded in the sliding grooves on the inner wall of the feeding pipe 21. It can slide radially along the sliding grooves to adjust the flow cross section of the powder. A control valve 22 is rotatably positioned below the material shielding frame 23. The material shielding frame 23 has several circumferentially arranged discharge ports 231. The control valve 22 has rotatable valve plates 221 corresponding to the discharge ports 231. In this embodiment, the valve plate 221 includes a valve plate body at the top and a ring plate 222 at the bottom. The valve plate body has a corresponding interface 223 for each discharge port 231. The valve plate 221 rotates with the drive mechanism 222. The drive mechanism uses a small dustproof motor. The gearbox of the dustproof motor is fixed to the inner wall of the feeding pipe 21 through a connector. The motor body is installed on the outer wall of the pipe and is connected to the input shaft of the gearbox through a transmission shaft, thereby driving the valve plate 221.

[0032] When the valve plate body's interface 223 rotates to fully overlap with the discharge port 231, the discharge port 231 is fully open, and the powder falls steadily at a set flow rate; when rotated to fully cover, the discharge port 231 is completely closed, blocking the falling material. The outer wall of the annular plate 225 at the bottom of the valve plate 221, corresponding to the discharge port, is provided with docking grooves 224 that correspond one-to-one with the discharge port. When the docking grooves 224 are aligned with the discharge port, the recovered powder settles in the buffer chamber 32 and flows directly into the feeding pipe 21, achieving zero-loss closed-loop recovery. This structure achieves precise timing switching between feeding and recovery through mechanical linkage, avoiding airflow disturbance and powder cross-contamination.

[0033] Specifically, the inner wall of the packaging box 1 has a sandwich cavity 13. The air inlet is connected to the sandwich cavity 13 through an air inlet pipe. Multiple evenly distributed suction holes are arrayed on the sandwich cavity 12, and the suction holes extend into the inner cavity of the packaging box 1. The bottom surface of the suction holes has an inclined structure facing the packaging box 1. This inclined structure causes the airflow to be deflected before entering the sandwich cavity 13, thereby forming a spiral upward airflow in the inner cavity of the packaging box 1, effectively entraining suspended powder and guiding it to the top dust collection port, significantly improving the collection efficiency. The structure of the multi-suction hole array further enhances the uniformity and coverage of the airflow. Combined with the directional interception of the inclined filter bag 33, the powder completes multi-stage inertial separation and dual collection of the filter material surface adsorption in the spiral airflow.

[0034] Specifically, when the valve plate 221 is driven by the drive mechanism 222 to rotate to the first preset angle, each pair of interfaces completely overlaps with the corresponding material discharge port, connecting the upstream and downstream of the feeding pipe 21. At this time, the discharge port is blocked, and the powder falls stably after being evenly dispersed by the shielding frame 23. At this time, the negative pressure mechanism 3 continuously draws in the dust-laden airflow inside the packaging box 1 through the air inlet at the top of the buffer chamber 32. The airflow is efficiently filtered by the filter bag 33, and the clean air is discharged from the air outlet. The dust is trapped on the surface of the filter bag and naturally slides to the bottom of the buffer chamber by gravity. In this state, the dust inside the packaging box 1 is effectively captured and separated, thereby effectively filtering out the dust during packaging and ensuring that the cleanliness of the packaging environment meets the standards.

[0035] When the valve plate 221 is driven by the drive mechanism 222 to rotate to the second preset angle, each docking groove 224 completely overlaps with the corresponding discharge port, connecting the downstream of the feeding pipe 21 to the buffer chamber 32, at which point the upstream and downstream of the feeding pipe are cut off. Under the action of gravity, the recovered powder flows precisely into the feeding pipe 21 through the discharge port and docking groove. At this time, the negative pressure mechanism 3 continues to operate, maintaining a stable negative pressure in the buffer chamber 32, ensuring that the powder flows back smoothly without airflow disturbance, and avoiding secondary dust generation. At the same time, the negative pressure of the negative pressure mechanism 3 continuously acts on the packaging box 1 through the feeding pipe 21, which can restrain the residual loose dust at the end of the feeding pipe 21 to a certain extent, further reducing the dust concentration gradient in the packaging box and improving the overall dust removal efficiency. Simultaneously, when the new material bag is placed into the packaging box 1, the negative pressure through the feeding pipe 21 can absorb and deflate the material bag, effectively preventing the sealing deviation and powder leakage caused by the bulging of the material bag, ensuring the stability and sealing of the packaging process, and reducing the dust dispersion caused by the escape of gas during the filling process.

[0036] A weighing mechanism 12 is installed at the bottom of the packaging box 1. The weighing mechanism 12 collects the powder filling quality data in real time and links with the control system to dynamically adjust the switching sequence of the valve plate 221. When the filling quality is close to the preset threshold, the control system finely adjusts the valve plate 221 to the second preset angle in advance, so that the return channel is opened in advance, and a buffer time is reserved to eliminate the inertial impulse of the residual powder in the feeding pipe.

[0037] In this embodiment, the weighing mechanism 12 includes a lifting mechanism 121 and a weighing platform 122. The lifting mechanism 121 is used to lift the weighing platform 122 to support the packaging bag. The weighing platform 122 has a built-in high-precision pressure sensor as a weighing sensor. The lifting mechanism 121 drives the weighing platform 122 to rise and fall smoothly in the vertical direction, ensuring that the packaging bag is always under stress throughout the filling process, providing stable support for the self-sealing bag. In this embodiment, the lifting mechanism 121 adopts a scissor-type lifting mechanism driven by an electric actuator. Its structure is compact and its response is rapid, enabling it to complete the lifting and resetting actions in a very short time, thereby minimizing the interference of mechanical vibration on the weighing accuracy.

[0038] Furthermore, a sliding mechanism 41 is installed on the front side inside the packaging box 1. The sliding mechanism 41 is a linear guide rail structure, and a mounting mechanism 4 is slidably mounted on the sliding mechanism 41. A linear drive mechanism 42 is installed on one side of the sliding mechanism 41. In this embodiment, the linear drive mechanism 42 is a servo motor-driven synchronous belt transmission mechanism. The linear drive mechanism 42 precisely drives the mounting mechanism 4 to slide back and forth along the guide rail via the synchronous belt, accurately controlling the docking position between the mounting mechanism 4 and the opening of the bag to be packaged, ensuring that the bag opening is flexibly clamped and accurately fitted into the filling tube in a stress-free state. The mounting mechanism 4 has a mounting tube 43, and the end of the mounting tube 43 is provided with a multi-layer silicone sealing ring. When the mounting tube 43 moves backward and docks with the feeding tube 21, the silicone sealing ring undergoes elastic deformation, achieving an annular seal with excellent airtightness.

[0039] A clamping cylinder 44 is installed on both sides of the sleeve tube 43. The piston rod of the clamping cylinder 44 has an arc-shaped clamping block 45 at its front end that matches the outer surface of the sleeve tube 43. The clamping cylinders 44 operate synchronously, driving the arc-shaped clamping blocks 45 to clamp the sleeve tube 43 from both sides towards the center, thus clamping the opening of the self-sealing bag onto the sleeve tube 43, ensuring a stable and reliable mechanical seal between the bag opening and the sleeve tube 43. After clamping, the sleeve tube 43 moves backward under the drive of the linear drive mechanism 42, thereby achieving precise docking between the bag opening and the feeding pipe. After docking, the powder in the feeding pipe 21 is smoothly filled under the combined action of negative pressure and gravity.

[0040] After filling is completed, the clamping cylinder 44 releases the bag opening, and the packaging bag is taken out manually or by an automatic unloading robot. Then the sliding mechanism 41 resets and stands by, and the packaging mechanism 4 automatically moves to the initial position on the outside to prepare for the next bagging operation.

[0041] During powder filling, the linear drive mechanism 42 first moves the packaging mechanism 4 forward to the bag receiving position, at which point the packaging tube 43 is extended. The operator or automatic feeding device then places the self-sealing bag opening onto the outside of the packaging tube 43. Subsequently, the clamping cylinder 44 drives the arc-shaped clamping block 45 to retract inward, firmly clamping the bag opening between the outer wall of the packaging tube 43 and the arc-shaped clamping block 45, forming a reliable radial seal and effectively preventing dust from overflowing. At the same time, the weighing platform 122, in conjunction with the lifting mechanism 121, finely adjusts the height to eliminate the initial interference of the bag's own weight on the weighing sensor. Then, the box door 11 is closed, forming a sealed space inside the packaging box 1. At this time, the negative pressure dust removal system is activated to extract air from the box to maintain a slightly negative pressure environment, preventing fine dust generated during powder filling from escaping into the external environment. Then, the feeding pipe 21 is opened, and the powder falls into the bag at a uniform speed under the guidance of gravity and airflow. As powder is continuously injected, the weighing sensor monitors the weight of the material inside the bag in real time. When the value approaches the preset target, the control system automatically switches to micro-feeding mode, using an extremely slow flow rate for final precise replenishment until the set threshold is reached. Once the weight reaches the target, the feeding pipe 21 immediately closes to cut off the material flow. Next, the negative pressure dust removal system runs for several seconds to thoroughly remove residual dust, ensuring the bag opening is clean and uncontaminated. Subsequently, the internal air pressure of the sealing box 11 returns to normal, and the box door opens automatically. At this time, the sleeve tube 43 retracts backward under the drive of the linear drive mechanism 42, completely separating the bag opening from the sleeve tube 43. The clamping cylinder 44 releases the arc-shaped clamping block 45, releasing the mechanical clamp on the bag opening.

Claims

1. A closed dust removal and recycling device for powder packaging, comprising a packaging box (1) and a hopper (2), wherein the packaging box (1) has a door (11) on its front side, and the packaging box (1) is a sealed box, characterized in that: The hopper (2) is located above the packaging box (1). A feeding pipe (21) for material feeding is provided at the bottom of the hopper (2). The feeding pipe (21) includes a vertical section and a horizontal section connected in an L-shape. The horizontal section at the end of the feeding pipe (21) is located inside the packaging box (1). A negative pressure mechanism (3) is provided on the outside of the packaging box (1). The negative pressure mechanism (3) includes a negative pressure fan (31) and a buffer chamber (32). A filter bag (33) is provided inside the buffer chamber (32). The buffer chamber (32) has an air inlet, an air outlet, and a material outlet. The air outlet is connected to the negative pressure fan (31). The air inlet is connected to the inside of the packaging box (1) through a pipeline. The discharge port is connected to the feeding pipe (21). A control valve (22) is provided on the feeding pipe (21). The control valve (22) is used to control the feeding pipe (21) and the discharge port to alternately conduct. A weighing mechanism (12) is provided at the bottom of the packaging box (1). A sliding mechanism (41) is provided on the front side of the packaging box (1). A mounting mechanism (4) is provided on the sliding mechanism (41). A linear drive mechanism (42) is provided on one side of the sliding mechanism (41). A mounting tube (43) is provided on the mounting mechanism (4). When the linear drive mechanism (42) drives the mounting mechanism (4) to move inward, the mounting tube (43) connects with the end of the feeding pipe (21).

2. The closed-loop dust removal and recycling equipment for powder packaging according to claim 1, characterized in that: The inner wall of the packaging box (1) has a sandwich cavity (13). The air inlet is connected to the sandwich cavity (13) through an air inlet pipe. Multiple evenly distributed air suction holes are arranged on the sandwich cavity (12). The air suction holes penetrate into the inner cavity of the packaging box (1).

3. The closed-loop dust removal and recycling equipment for powder packaging according to claim 2, characterized in that: The bottom surface of the air intake hole has an inclined structure facing the packaging box (1).

4. The closed-loop dust removal and recycling equipment for powder packaging according to claim 1, characterized in that: The weighing mechanism (12) includes a lifting mechanism (121) and a weighing platform (122). The lifting mechanism (121) is used to lift the weighing platform (122) to support the packaging bag. A weighing sensor is provided at the bottom of the weighing platform (122).

5. The closed-loop dust removal and recycling equipment for powder packaging according to claim 1, characterized in that: The buffer cavity (32) is sleeved on the outside of the feeding pipe (21), and multiple discharge ports are provided, which are evenly arranged in a circle around the side wall of the feeding pipe (21).

6. The closed-loop dust removal and recycling equipment for powder packaging according to claim 1, characterized in that: The bottom surface of the buffer cavity (32) is tapered and faces the feed pipe (21).

7. The closed-loop dust removal and recycling equipment for powder packaging according to claim 1, characterized in that: A material shielding frame (23) is installed inside the feeding pipe (21). The control valve (22) is rotatably installed below the material shielding frame (23). Several material drop ports (231) are arranged in a circular pattern on the material shielding frame (23). The control valve (22) includes a valve plate (221) and a drive mechanism (222). The valve plate (221) is provided with a docking interface (223) corresponding to each material drop port (231). The outer wall of the valve plate (221) is provided with a docking groove (223) corresponding to each discharge port. 24) When the valve plate (221) is driven by the driving mechanism (222) to rotate to the first preset angle, each docking port and the corresponding discharge port are completely overlapped, connecting the upstream and downstream of the feeding pipe (21). At this time, the discharge port is blocked. When the valve plate (221) is driven by the driving mechanism (222) to rotate to the second preset angle, each docking groove (224) and the corresponding discharge port are completely overlapped, connecting the downstream of the feeding pipe (21) with the buffer chamber (32). At this time, the upstream and downstream of the feeding pipe are cut off.

8. The closed-loop dust removal and recycling equipment for powder packaging according to claim 1, characterized in that: The sleeve tube (43) is provided with clamping cylinders (44) on both sides, and the piston rod of the clamping cylinder (44) is provided with an arc-shaped clamping block (45) that matches the outer side of the sleeve tube (43).

9. A closed-loop dust removal and recycling device for powder packaging according to claim 1, characterized in that: The sleeve (43) is fitted onto the end of the feeding pipe (21), and the rear end of the sleeve (43) is sealed to the feeding pipe (21).

10. A closed-loop dust removal and recycling device for powder packaging according to claim 1, characterized in that: The filter bag (33) is a detachable filter bag assembly, and the buffer chamber (32) is provided with a pulse backflush mechanism at the top.

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