An air purification device and method for a label production workshop
By installing an airflow counter-current mechanism and a waste heat recovery system in the purification chamber of the label production workshop, the problem of mixed pollution from printing VOCs and die-cutting dust has been solved, achieving efficient separation of paper dust and long-term stable operation of the filter cartridge, reducing operation and maintenance costs and energy consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HAIJIA LABEL PROD (NANTONG) CO LTD
- Filing Date
- 2026-06-04
- Publication Date
- 2026-06-30
AI Technical Summary
Existing technologies cannot effectively handle the mixed pollutants of printing VOCs and die-cutting dust in label production workshops, resulting in rapid switching of pollutant types in the transition zone. Paper dust easily absorbs moisture, sticks and clogs the filter device, leading to high operation and maintenance costs.
The airflow counter-flushing mechanism inside the purification chamber mixes printing exhaust gas with die-cutting gas to form large paper dust clumps. The paper dust is then dried by inertial separation through baffles and waste heat recovery mechanism. Combined with pulse backflushing cleaning, this achieves efficient separation of paper dust and long-term stable operation of the filter cartridge.
It achieves efficient agglomeration and separation of paper dust, reduces the filtration load on the filter cartridge, extends the cleaning cycle, reduces operation and maintenance costs, and reduces energy consumption by utilizing waste heat recovery.
Smart Images
Figure CN122298138A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of waste gas purification technology, and specifically discloses an air purification device and method for label production workshops. Background Technology
[0002] Self-adhesive labels are composite materials made of paper, film, or special materials as the face material, coated with adhesive on the back, and with silicone-coated release paper as the base paper. They are printed and die-cut into finished products. During the label production process, the inks and diluents used in the printing process will release high concentrations of VOCs, mainly composed of isopropanol, propanol, acetone, toluene, dichloromethane, and ethyl acetate. In the subsequent die-cutting process, the die-cutting blade cuts the self-adhesive material into shape, generating a large amount of paper dust and film debris. The dust concentration fluctuates significantly depending on the material and thickness, while the VOC concentration is relatively stable at 50-200 mg / m³. Printing and die-cutting are connected end-to-end on the online production line, and the physical distance between the transition zone is usually less than two meters, directly exposing operators to the combined pollution. Currently, for the treatment of VOCs from printing, the industry widely adopts honeycomb activated carbon adsorption technology, which can achieve an adsorption efficiency of 90%-95%, making it the mainstream choice for purifying printing exhaust gas.
[0003] For label manufacturing workshops where printing exhaust gas and die-cutting dust coexist, existing technologies mainly offer two solutions: First, separate treatment, where the printing station has a VOCs purification device and the die-cutting station has a dust removal device, with the two systems operating independently. However, this approach requires a large floor space, is costly, and lacks coverage in the transition area. Second, a series-based co-processing approach, employing multi-stage filtration and activated carbon adsorption processes, removing dust first and then adsorbing it. However, in label production lines, printing and die-cutting alternate, and the types of pollutants in the transition area change rapidly. Existing series-based solutions use fixed processes and cannot be adjusted as needed. Furthermore, when the humid and hot printing exhaust gas mixes directly with the paper dust-containing die-cutting exhaust gas, the paper dust easily absorbs moisture and adheres, clogging the filter devices and activated carbon pores, significantly increasing maintenance costs. Summary of the Invention
[0004] The purpose of this invention is to solve the problems existing in the background art, and to propose an air purification device for label production workshop, including a purification box, a dust collection hopper connected to the lower end of the purification box, supports connected to both sides of the lower end of the purification box, a discharge mechanism connected to the lower end of the dust collection hopper, and an airflow counter-flushing mechanism connected to the inner wall of the purification box. The airflow counter-current mechanism includes a premixing cylinder. A first air inlet pipe is connected to the lower part of one side of the purification box, and a second air inlet pipe is connected to the lower part of the other side of the purification box. A shaking mechanism is connected to both sides of the inner wall of the premixing cylinder. A counter-current baffle is connected between the two shaking mechanisms. The counter-current baffle has an inverted V-shaped structure. The two inclined surfaces below the counter-current baffle correspond to the air outlets of the first and second air inlet pipes, respectively. A top plate is connected to the upper end of the premixing cylinder. The top plate has an inverted V-shaped structure, and an air outlet is opened at the upper end of the top plate. The inner walls of the purification chamber are connected to baffles above the premixing cylinders on both sides. A recovery pulse mechanism is connected to the upper part of the inner wall of the purification chamber. A purification exhaust mechanism is connected to one side of the purification chamber. A waste heat recovery mechanism is connected to the lower part of one side of the purification chamber. A connecting jacket is connected to the upper part of the outer wall of the purification chamber. A stabilizing pipe is connected to one side of the upper end of the connecting jacket. The purification and exhaust mechanism includes two exhaust pipes. One end of each exhaust pipe is connected to the upper part of one side of the purification box. One end of each exhaust pipe is connected to an exhaust pipe. One end of the exhaust pipe is connected to an exhaust pipe. The lower end of the exhaust pipe is connected to a first processing cylinder. A dehumidifying filter block is embedded inside the first processing cylinder. A conveying fan is connected to one side of the first processing cylinder. The input end of the conveying fan is connected to the lower end of the first processing cylinder. The output end of the conveying fan is connected to a second processing cylinder. An activated carbon filter block is embedded inside the second processing cylinder. The waste heat recovery mechanism includes a connecting fan, which is connected to the lower part of one side of the purification box via a fixing plate. The input end of the connecting fan is connected to an air inlet pipe, one end of which is connected to the upper part of one side of the second treatment cylinder. The output end of the connecting fan is connected to a connecting pipe, the upper end of which extends through into the interior of the connecting jacket. Air outlets are provided on both sides of the connecting pipe corresponding to the interior of the connecting jacket. The upper end of the connecting pipe is connected to a fixing pipe, one end of which is connected to one end of the pulse cylinder.
[0005] An air purification method for a label manufacturing workshop includes the following steps: S1: The humid and hot organic waste gas generated at the printing station is introduced into the premixing cylinder through the first air inlet pipe, and the paper dust gas generated at the die-cutting station is introduced into the premixing cylinder through the second air inlet pipe; the two airflows impact the two inclined surfaces of the opposing baffle plate respectively, and the opposing collision and mixing occur at the bottom tip of the inverted V-shaped opposing baffle plate. The water vapor in the humid and hot organic waste gas wets the paper dust and agglomerates it to form large paper dust clumps. S2: The mixed airflow carries large paper dust particles upwards and exits the premixing cylinder through the air outlet on the top plate. After passing through the baffle plate for equalization, it enters the recovery pulse mechanism and is precisely filtered by the filter cartridge. The filtered clean gas enters the purification exhaust mechanism, is purified by activated carbon adsorption, and is then discharged. S3: The waste heat recovery mechanism recovers the heat gas discharged from the purification exhaust mechanism. Part of the recovered heat gas is introduced into the connecting jacket, which raises the temperature of the inner wall of the purification box at the corresponding connecting jacket, thereby generating high temperature at the baffle plate to dry the moisture in the airflow. The other part of the recovered heat gas enters the recovery pulse mechanism to perform pulse backflushing self-cleaning of the filter cartridge.
[0006] Compared with the prior art, the present invention has the following beneficial effects: The humid and hot organic waste gas from the printing station and the paper dust-containing gas from the die-cutting station are introduced into the premixing cylinder through the first and second air inlets, respectively. They are mixed by collision at the inverted V-shaped bottom tip of the anti-collision baffle. The moisture in the humid and hot waste gas wets and agglomerates the fine paper dust into large particles, thus achieving paper dust wetting, agglomeration, and coarsening. This transforms the originally difficult-to-capture fine paper dust into easily separated large particles, reducing the filtration load on the subsequent filter cartridges. At the same time, the paper dust agglomerates and absorbs some moisture, reducing the humidity of the exhaust gas and creating favorable conditions for subsequent activated carbon adsorption. The anti-collision baffle is elastically supported by a shaking mechanism, generating slight vibrations under the impact of the airflow. It utilizes the energy of the airflow itself to achieve self-cleaning of the baffle surface, preventing paper dust adhesion and accumulation, and ensuring long-term stability of the mixing effect.
[0007] By installing staggered baffles on the inner wall of the purification chamber and connecting jackets in corresponding areas outside the chamber, the waste heat recovery mechanism introduces warm gas into the jackets, creating a high-temperature environment at the baffles. The high-temperature baffles contact-dry the rising paper dust clumps, forming a dry and hard outer shell on the surface of the paper dust, effectively preventing the paper dust from absorbing moisture and clogging the filter cartridges. This solves the pain points of high humidity and easy paper dust clogging in label workshops. At the same time, the baffles force the airflow to fold back multiple times, and large paper dust clumps fall into the dust collection hopper after impacting the wall due to inertia, realizing secondary dust removal and separation based on the principle of inertia, further reducing the burden on the filter cartridges and extending the cleaning cycle and service life.
[0008] The clean, warm gas emitted after purification is recovered and reused through a waste heat recovery mechanism. A portion of it is sent to the pulse jet as a backflushing gas source. The warm backflushing gas avoids the problem of condensation and bag clogging caused by throttling and cooling of the filter cartridges in traditional cold air backflushing, resulting in better dust removal effect. Moreover, the backflushing gas source is clean and free from secondary pollution. The waste heat is also used to heat the connecting jacket to dry paper dust and provide a backflushing gas source, realizing the utilization of waste heat and reducing the energy consumption and maintenance cost of the equipment. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the purification box and ash collection hopper of the present invention; Figure 3 This is a schematic diagram of the positional structure of the connecting jacket and the baffle plate of the present invention; Figure 4 This is a schematic diagram of the airflow counter-current mechanism of the present invention; Figure 5 This is a schematic diagram of the installation structure of the premixing cylinder and the counter-flushing baffle of the present invention; Figure 6 This is a schematic diagram of the installation structure of the two shaking mechanisms and the counter-shock baffle of the present invention; Figure 7 This is a schematic diagram of the installation and connection structure of the dehumidification filter block and the activated carbon filter block of the present invention; Figure 8 This is a schematic diagram of the structure of multiple air outlets on the connecting pipe of the present invention.
[0010] In the diagram: 1. Purification box; 2. Ash hopper; 3. Support frame; 4. Discharge pipe; 5. Drive motor; 6. Tilting plate; 7. Mounting plate; 8. Premixing cylinder; 9. First air inlet pipe; 10. Second air inlet pipe; 11. Mounting block; 12. Connecting rod; 13. Sliding frame; 14. Buffer spring; 15. Connecting block; 16. Counter-impact baffle; 17. Top plate; 18. Air outlet; 19. Baffle plate; 20. Partition plate; 21. 21. Filter cartridge; 22. Support plate; 23. Pulse cylinder; 24. Air supply pipe; 25. Pulse nozzle; 26. Air outlet pipe; 27. Exhaust stack; 28. Exhaust pipe; 29. First treatment cylinder; 30. Dehumidifying filter block; 31. Conveying fan; 32. Second treatment cylinder; 33. Activated carbon filter block; 34. Connecting fan; 35. Air inlet pipe; 36. Connecting jacket; 37. Connecting pipe; 38. Air outlet; 39. Fixing pipe. Detailed Implementation
[0011] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0012] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.
[0013] like Figures 1-8 An air purification device for a label production workshop is shown, including a purification box 1, a dust collection hopper 2 connected to the lower end of the purification box 1, the dust collection hopper 2 is used to collect paper dust clumps and particulate matter separated and falling from the airflow, the purification box 1 is connected to both sides of the lower end of the purification box 1 with a support 3, the lower end of the dust collection hopper 2 is connected to a discharge mechanism, and the inner wall of the purification box 1 is connected to an airflow counter-flushing mechanism. The airflow counter-current mechanism includes a premixing cylinder 8, a first air inlet pipe 9 connected to the lower part of one side of the purification box 1, a second air inlet pipe 10 connected to the lower part of the other side of the purification box 1, a shaking mechanism connected to both sides of the inner wall of the premixing cylinder 8, a counter-current baffle 16 connected between the two shaking mechanisms, the counter-current baffle 16 is in the shape of an inverted V-shape, the two inclined surfaces below the counter-current baffle 16 correspond to the air outlets of the first air inlet pipe 9 and the second air inlet pipe 10 respectively, and a top plate 17 connected to the upper end of the premixing cylinder 8, the top plate 17 is in the shape of an inverted V-shape, and an air outlet 18 is opened at the upper end of the top plate 17. The humid and hot organic waste gas generated at the printing station enters the premixing cylinder 8 through the first air inlet pipe 9, and the paper dust gas generated at the die-cutting station enters the premixing cylinder 8 through the second air inlet pipe 10. The two airflows impact the two inclined surfaces of the opposing baffle 16 respectively, and collide and mix at the bottom tip of the inverted V-shaped structure. During this process, the water vapor in the humid and hot waste gas quickly wraps the paper dust particles, wetting the fine paper dust and agglomerating it in the turbulent collision to form large paper dust agglomerates with significantly increased particle size. When the airflow hits the opposing baffle 16, the shaking mechanism causes the opposing baffle 16 to vibrate slightly under the impact of the airflow to prevent the wet paper dust from adhering and accumulating on the board surface. Baffles 19 are connected to both sides of the inner wall of the purification box 1 above the premixing cylinder 8. A recovery pulse mechanism is connected to the upper part of the inner wall of the purification box 1. A purification exhaust mechanism is connected to one side of the purification box 1. A waste heat recovery mechanism is connected to the lower side of one side of the purification box 1. A connecting sleeve 36 is connected to the upper part of the outer wall of the purification box 1. A stabilizing pipe is connected to one side of the upper end of the connecting sleeve 36. The stabilizing pipe is used to vent the inside of the box. The mixed airflow carries large paper dust particles upwards and exits the premixing cylinder 8 through the air outlet 18 on the top plate 17. It then enters the baffle plate 19 area, where the baffle plate 19 forces the airflow to change direction multiple times. This ensures even airflow distribution and prolongs the residence time of the paper dust particles in the high-temperature area. Large paper dust particles fall into the lower dust collection hopper 2 after impacting the baffle plate 19 or the cylinder wall due to inertia. The remaining fine powder enters the recovery pulse mechanism for precision filtration with the airflow. The filtered clean gas is then purified by the purification exhaust mechanism before being discharged. The waste heat recovery mechanism recovers the hot gas discharged from the purification exhaust mechanism and introduces it into the connecting jacket 36, which raises the temperature of the inner wall of the purification box 1 corresponding to the connecting jacket 36. This, in turn, generates high temperature at the baffle plate 19, drying the moisture carried in the airflow and preventing the paper dust from absorbing moisture and sticking together. The stabilizing pipe is used to discharge the gas in the connecting jacket 36 to maintain the air pressure balance in the jacket.
[0014] like Figures 2-3 As shown: The discharge mechanism includes a discharge pipe 4, the upper end of which is connected to the lower end of the ash collection hopper 2. A drive motor 5 is connected to one side of the discharge pipe 4. The lower end of the drive motor 5 is connected to one side of the bracket 3 through a connecting frame. The output end of the drive motor 5 extends through the discharge pipe 4 and is connected to a tilting plate 6. The tilting plate 6 rotates inside the discharge pipe 4. The paper dust clumps and particles collected in the dust collection hopper 2 fall into the discharge pipe 4 under the action of gravity. The drive motor 5 drives the turning plate 6 to rotate. During the rotation, the turning plate 6 turns and pushes the accumulated material. On the one hand, it prevents the paper dust from absorbing moisture in the discharge pipe 4 and clumping together, bridging and blocking the outlet. On the other hand, it evenly conveys the material to the discharge port, which is convenient for subsequent centralized cleaning or recycling.
[0015] like Figures 4-6 As shown: the lower end of the premixing cylinder 8 is open, and the lower part of the outer wall of the premixing cylinder 8 is inclined. The lower parts of both sides of the premixing cylinder 8 are connected to the mounting plates 7. One side of each mounting plate 7 is connected to the lower part of the inner wall of the purification box 1. One end of the first air inlet pipe 9 passes through the purification box 1 and the premixing cylinder 8 and extends into the interior of the premixing cylinder 8. One end of the second air inlet pipe 10 passes through the purification box 1 and the premixing cylinder 8 and extends into the interior of the premixing cylinder 8. One end of both the first air inlet pipe 9 and the second air inlet pipe 10 is inclined. The shape of the baffle plate 19 is inclined. The premixing cylinder 8 has an open bottom, allowing large paper dust particles formed after the collision to fall directly into the dust collection hopper 2 from the bottom opening, preventing accumulation at the bottom of the premixing cylinder 8. The lower part of the outer wall of the premixing cylinder 8 is inclined, which acts as a guide, guiding the falling particles to slide smoothly into the dust collection hopper 2. The outlets of the first air inlet pipe 9 and the second air inlet pipe 10 are set at an inclined angle, so that the two airflows impact the inclined surface of the anti-collision baffle 16 at a predetermined angle, enhancing the collision intensity and mixing effect of the airflow at the bottom tip of the anti-collision baffle 16. The baffle 19 is set at an inclined angle, making the inertial separation effect generated by the airflow during the reversal more significant, and making it easier for large paper dust particles to impact the plate surface and fall off and settle.
[0016] like Figure 5 and Figure 6 As shown: The shaking mechanism includes a mounting block 11. One side of the mounting block 11 is connected to one side of the inner wall of the premixing cylinder 8. Both sides of the lower end of the mounting block 11 are connected to connecting rods 12. The connecting rods 12 are in the shape of an inverted T-shape. The outer walls of the two connecting rods 12 are slidably connected to a sliding frame 13. The lower part of the outer walls of the two connecting rods 12 is connected to a buffer spring 14. The lower ends of the two buffer springs 14 are in contact with the T-shaped part below the connecting rods 12. The upper ends of the two buffer springs 14 are connected to the upper end of the inner wall of the sliding frame 13. The lower end of the sliding frame 13 is connected to a connecting block 15. The connecting blocks 15 of the two shaking mechanisms are respectively connected to both sides of the counter-impact spoiler 16. The airflow from the first air intake pipe 9 and the second air intake pipe 10 impacts the two inclined surfaces of the counter-spoiler plate 16. The impact force of the airflow on the counter-spoiler plate 16 is transmitted to the sliding frame 13 through the connecting block 15. The sliding frame 13 slides up and down along the connecting rod 12 and compresses or releases the buffer spring 14, causing the counter-spoiler plate 16 to vibrate slightly in the vertical direction. This vibration effect is achieved by utilizing the impact energy of the airflow itself, without the need for external power. It can effectively peel off the wet paper dust attached to the surface of the counter-spoiler plate 16 and prevent the paper dust from accumulating and agglomerating on the plate surface for a long time.
[0017] like Figure 2 and Figure 3 As shown: The recovery pulse mechanism includes a partition 20, with exhaust ports evenly distributed on the upper end of the partition 20. Filter cartridges 21 are connected to the lower end of the partition 20 at each of the multiple exhaust ports. A support plate 22 is connected to one side of the upper end of the purification chamber 1. A pulse cylinder 23 is connected to the upper end of the support plate 22. Air supply pipes 24 are connected to one side of each pulse cylinder 23. One end of each air supply pipe 24 extends through into the interior of the purification chamber 1. Pulse nozzles 25 are connected to the lower ends of each air supply pipe 24 at the locations above each of the multiple filter cartridges 21. Each pulse nozzle 25 corresponds to a different filter cartridge 21. After being evenly distributed by the baffle plate 19, the dust-laden airflow enters the filter cartridge 21 area upwards. The gas passes through the filter media of the filter cartridge 21 and enters the interior of the filter cartridge 21. Fine powder is intercepted on the outer surface of the filter cartridge 21. Clean gas enters the upper space through the exhaust port on the partition plate 20. As filtration proceeds, the powder cake layer on the outer surface of the filter cartridge 21 gradually thickens, and the filtration resistance increases. At this time, the clean back-flushing gas stored in the pulse cylinder 23 is injected into the interior of the filter cartridge 21 in a pulse form through the air supply pipe 24 and the pulse nozzle 25. Positive pressure is instantly formed inside the filter cartridge 21. The airflow penetrates the filter media from the inside to the outside, peeling off and blowing off the powder cake layer attached to the outer surface of the filter cartridge 21, which falls into the dust collection hopper 2 below. The pulse back-flushing cleaning method has high cleaning efficiency and low air consumption. Moreover, the back-flushing gas of this device comes from clean hot gas after waste heat recovery, and the temperature is higher than that of room temperature. It will not cause condensation and clogging of the inner wall of the filter cartridge 21 during back-flushing.
[0018] like Figure 7 As shown: The purification and exhaust mechanism includes two exhaust pipes 26. One end of each exhaust pipe 26 is connected to the upper part of one side of the purification box 1. One end of each exhaust pipe 26 is connected to an exhaust pipe 27. One end of the exhaust pipe 27 is connected to an exhaust pipe 28. The lower end of the exhaust pipe 28 is connected to a first treatment cylinder 29. A dehumidifying filter block 30 is embedded inside the first treatment cylinder 29. A conveying fan 31 is connected to one side of the first treatment cylinder 29. The input end of the conveying fan 31 is connected to the lower end of the first treatment cylinder 29. The output end of the conveying fan 31 is connected to a second treatment cylinder 32. An activated carbon filter block 33 is embedded inside the second treatment cylinder 32. The clean gas (still containing VOCs) after being precisely filtered by filter cartridge 21 enters exhaust stack 27 through exhaust pipe 26, and then enters first treatment stack 29 through exhaust pipe 28. In first treatment stack 29, the gas passes through dehumidifying filter block 30 from bottom to top, and the gas is dehumidified again. The conveying fan 31 provides power to pump the gas after the first adsorption to second treatment stack 32, where the gas passes through activated carbon filter block 33 again for adsorption and purification, ensuring that the VOCs emission concentration meets the standard.
[0019] like Figures 7-8 As shown: The waste heat recovery mechanism includes a connecting fan 34. The lower part of the connecting fan 34 is connected to the lower part of one side of the purification box 1 through a fixing plate. The input end of the connecting fan 34 is connected to an air inlet pipe 35. One end of the air inlet pipe 35 is connected to the upper part of one side of the second processing cylinder 32. The output end of the connecting fan 34 is connected to a connecting pipe 37. The upper end of the connecting pipe 37 extends through to the inside of the connecting sleeve 36. Air outlets 38 are opened on both sides of the connecting pipe 37 corresponding to the inside of the connecting sleeve 36. The upper end of the connecting pipe 37 is connected to a fixing pipe 39. One end of the fixing pipe 39 is connected to one end of the pulse cylinder 23. A fixing valve is connected to one side of the outer wall of the fixing pipe 39. When the recovery pulse mechanism needs to perform pulse, the fixing valve is opened. The gas emitted after purification by the second treatment cylinder 32 still has a certain temperature. The connecting fan 34 draws a portion of clean, warm gas from the outlet side of the second treatment cylinder 32 through the air inlet pipe 35 and delivers it to the inside of the connecting jacket 36 through the connecting pipe 37. The warm gas is evenly distributed in the annular space of the connecting jacket 36 through the air outlets 38 on both sides of the connecting pipe 37, heating the inner wall of the purification box 1. The heat is conducted through the inner wall to the baffle plate 19, maintaining a high temperature in the area of the baffle plate 19, and performing contact drying on the paper dust clumps to prevent the paper dust from absorbing moisture and sticking together. At the same time, the fixed pipe 39 at the upper end of the connecting pipe 37 delivers another portion of warm gas to the pulse cylinder 23 as the air source for pulse backflushing cleaning.
[0020] An air purification method for a label manufacturing workshop includes the following steps: S1: The humid and hot organic waste gas generated at the printing station is introduced into the premixing cylinder 8 through the first air inlet pipe 9, and the paper dust gas generated at the die-cutting station is introduced into the premixing cylinder 8 through the second air inlet pipe 10; the two airflows impact the two inclined surfaces of the opposing baffle 16 respectively, and the opposing baffle 16 with the inverted V-shaped structure collide and mix at the bottom tip, and the water vapor in the humid and hot organic waste gas wets the paper dust and agglomerates it to form large paper dust clumps. S2: The mixed airflow carries large paper dust particles upward and is discharged from the premixing cylinder 8 through the air outlet 18 on the top plate 17. After passing through the baffle plate 19 for equalization, it enters the recovery pulse mechanism and is precisely filtered by the filter cartridge 21. The filtered clean gas enters the purification exhaust mechanism, is purified by activated carbon adsorption, and is discharged. S3: The waste heat recovery mechanism recovers the heat gas discharged from the purification exhaust mechanism. Part of the recovered heat gas is introduced into the connecting jacket 36, which raises the temperature of the inner wall of the purification box 1 corresponding to the connecting jacket 36, thereby generating high temperature at the baffle plate 19 to dry the moisture in the airflow. The other part of the recovered heat gas enters the recovery pulse mechanism to perform pulse backflushing self-cleaning on the filter cartridge 21.
[0021] It should be noted that the specific circuit connections and control methods of the actuators involved in the embodiments of the present invention, such as the drive motor 5, the connecting fan 34, the conveying fan 31, the rotation control of the tipping plate 6, the fixed valve, the pulse valve, and the pulse jet timing control of the pulse nozzle 25, are all conventional technical means in the art and belong to the scope of prior art. Those skilled in the art can select appropriate models of motors, fans, and pulse controllers according to actual working conditions and perform conventional circuit design and programming. The specific working principles and circuit connection relationships will not be elaborated here.
[0022] Working principle: The humid and hot organic waste gas generated at the printing station enters the premixing cylinder 8 through the first air inlet pipe 9, and the paper dust-containing gas generated at the die-cutting station enters the premixing cylinder 8 through the second air inlet pipe 10. The outlets of the first air inlet pipe 9 and the second air inlet pipe 10 are both set at an angle and are respectively aligned with the two inclined surfaces below the anti-collision baffle 16. The two airflows impact the two inclined surfaces of the anti-collision baffle 16 at a certain angle, and violent collision and mixing occur at the bottom tip of the inverted V-shaped structure of the anti-collision baffle 16. During this process, the water vapor carried in the humid and hot organic waste gas quickly coats the surface of the paper dust particles, wetting the fine paper dust and making it sticky. Under the action of turbulent collision, the paper dust particles stick together and agglomerate to form large paper dust clumps with significantly increased particle size.
[0023] At the same time, the impact force generated by the airflow impacting the anti-collision baffle 16 is transmitted to the shaking mechanism through the connecting block 15. The sliding frame 13 in the shaking mechanism slides up and down along the connecting rod 12 and compresses or releases the buffer spring 14, causing the anti-collision baffle 16 to generate micro-amplitude high-frequency shaking in the vertical direction. This shaking action can effectively peel off the wet paper dust attached to the surface of the anti-collision baffle 16, prevent the paper dust from accumulating and clumping on the plate surface, and ensure the stability of the anti-collision mixing effect. The heavier part of the large particle paper dust clump formed after the anti-collision collision can fall directly from the open bottom of the premixing cylinder 8 into the ash collection hopper 2.
[0024] The mixed airflow carries the remaining large paper dust clumps and fine powder upwards, exits the premixing cylinder 8 through the air outlet 18 on the top plate 17, and enters the area of baffles 19 arranged alternately on both sides of the inner wall of the purification chamber 1. The baffles 19 are set at an angle, which forces the airflow to change its flow direction multiple times during the upward process, forming a tortuous flow path. This design ensures that the airflow is evenly distributed on the cross-section of the purification chamber 1, avoiding local airflow concentration. On the other hand, during the repeated turning of the airflow, the large paper dust clumps, due to their large inertia, cannot change direction with the airflow in time and directly hit the surface of the baffles 19 or the inner wall of the purification chamber 1. Then, under the action of gravity, they slide down the wall and fall into the dust collection hopper 2, realizing secondary separation based on the principle of inertia.
[0025] After being evenly distributed and separated by inertia by the baffle plate 19, the airflow continues upward and enters the precision filtration area where the recovery pulse mechanism is located. The gas passes through the filter media of the filter cartridge 21 and enters the interior of the filter cartridge 21. Fine paper dust particles are intercepted on the outer surface of the filter cartridge 21. The clean gas enters the upper space through the exhaust port on the partition plate 20. As the filtration process continues, a powder cake layer gradually forms on the outer surface of the filter cartridge 21, and the filtration resistance increases accordingly. At this time, the recovery pulse mechanism is activated. The clean backflushing gas stored in the pulse cylinder 23 is injected into the interior of the filter cartridge 21 at high speed and downward in a pulse form through the air supply pipe 24 and the pulse nozzle 25. Positive pressure is instantly formed inside the filter cartridge 21. The airflow penetrates the filter media from the inside to the outside, peeling off and blowing off the powder cake layer attached to the outer surface of the filter cartridge 21, which falls into the dust collection hopper 2 below, thereby restoring the filtration performance of the filter cartridge 21.
[0026] The clean gas, after being precisely filtered by filter cartridge 21, still contains VOCs. It enters exhaust pipe 27 through outlet pipe 26, and then enters first treatment cylinder 29 through exhaust pipe 28. In first treatment cylinder 29, the gas passes through dehumidifying filter block 30 from bottom to top, thus dehumidifying the gas. Conveying fan 31 provides conveying power to pump the gas after one adsorption to second treatment cylinder 32. The gas passes through activated carbon filter block 33 again for adsorption and purification, ensuring that the VOCs emission concentration meets the standard before being discharged.
[0027] The gas emitted after purification by the second treatment cylinder 32 still carries a certain temperature. The connecting fan 34 in the waste heat recovery mechanism draws a portion of clean, warm gas from the outlet side of the second treatment cylinder 32 through the air inlet pipe 35, and delivers it to the inside of the connecting jacket 36 through the connecting pipe 37. The warm gas is evenly distributed in the annular space of the connecting jacket 36 through the air outlets 38 on both sides of the connecting pipe 37, continuously heating the inner wall of the purification box 1. The heat is conducted through the inner wall to the baffle plate 19, maintaining a high temperature in the area of the baffle plate 19, and performing contact drying treatment on the paper dust clumps passing through this area, causing the surface moisture of the paper dust clumps to evaporate and form a hard shell, preventing the paper dust from absorbing moisture and sticking to block the filter cartridge 21 in the subsequent filtration stage. At the same time, when the recovery pulse mechanism is working, the fixed valve is opened, and the fixed pipe 39 at the upper end of the connecting pipe 37 delivers another portion of warm gas to the pulse cylinder 23 as the air source for pulse backflushing cleaning. The stabilizing pipe connected to one side of the upper end of the connecting jacket 36 is used to maintain the air pressure balance in the connecting jacket 36 and to discharge the heat-exchanged gas.
[0028] The paper dust clumps and particles collected in the dust collection hopper 2 fall into the discharge pipe 4 under the action of gravity. The drive motor 5 in the discharge mechanism drives the tipping plate 6 to rotate. During the rotation, the tipping plate 6 turns and pushes the accumulated material to prevent the paper dust from absorbing moisture in the discharge pipe 4 and clumping up, bridging and blocking the outlet, and to evenly discharge the material to the subsequent collection device.
[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.
Claims
1. An air purification device for a label production workshop, comprising a purification chamber (1), characterized in that: The purification box (1) is connected to a dust collection hopper (2) at the lower end. Supports (3) are connected to both sides of the lower end of the purification box (1). A discharge mechanism is connected to the lower end of the dust collection hopper (2). An airflow counter-flushing mechanism is connected to the inner wall of the purification box (1). The airflow counter-current mechanism includes a premixing cylinder (8), a first air inlet pipe (9) is connected to the lower part of one side of the purification box (1), a second air inlet pipe (10) is connected to the lower part of the other side of the purification box (1), a shaking mechanism is connected to both sides of the inner wall of the premixing cylinder (8), and a counter-current baffle plate (16) is connected between the two shaking mechanisms. The counter-current baffle plate (16) is in the shape of an inverted V-shape. The two inclined surfaces below the counter-current baffle plate (16) correspond to the air outlets of the first air inlet pipe (9) and the second air inlet pipe (10) respectively. A top plate (17) is connected to the upper end of the premixing cylinder (8). The top plate (17) is in the shape of an inverted V-shape. An air outlet (18) is opened at the upper end of the top plate (17). The inner walls of the purification box (1) are connected to baffles (19) above the premixing cylinder (8) on both sides. The upper part of the inner wall of the purification box (1) is connected to a recovery pulse mechanism. The purification box (1) is connected to a purification exhaust mechanism on one side. The lower part of the purification box (1) is connected to a waste heat recovery mechanism. The upper part of the outer wall of the purification box (1) is connected to a connecting jacket (36). The upper side of the connecting jacket (36) is connected to a stabilizing pipe. The shaking mechanism includes a mounting block (11), one side of which is connected to one side of the inner wall of the premixing cylinder (8). Both sides of the lower end of the mounting block (11) are connected to connecting rods (12). The connecting rods (12) are in the shape of an inverted T-shape. The outer walls of the two connecting rods (12) are slidably connected to a sliding frame (13). The lower part of the outer walls of the two connecting rods (12) is connected to a buffer spring (14). The lower ends of the two buffer springs (14) are in contact with the T-shaped part below the connecting rods (12). The upper ends of the two buffer springs (14) are connected to the upper end of the inner wall of the sliding frame (13). The lower end of the sliding frame (13) is connected to a connecting block (15). The connecting blocks (15) of the two shaking mechanisms are respectively connected to both sides of the counter-flushing baffle (16).
2. The air purification device for a label production workshop according to claim 1, characterized in that: The discharge mechanism includes a discharge pipe (4), the upper end of which is connected to the lower end of the ash collection hopper (2). A drive motor (5) is connected to one side of the discharge pipe (4). The lower end of the drive motor (5) is connected to one side of the bracket (3) through a connecting frame. The output end of the drive motor (5) extends through into the discharge pipe (4) and is connected to a tilting plate (6). The tilting plate (6) rotates inside the discharge pipe (4).
3. An air purification device for a label production workshop according to claim 2, characterized in that: The lower end of the premixing cylinder (8) is open, and the lower part of the outer wall of the premixing cylinder (8) is inclined. The lower parts of both sides of the premixing cylinder (8) are connected to mounting plates (7). One side of each mounting plate (7) is connected to the lower part of the inner wall of the purification box (1). One end of the first air inlet pipe (9) passes through the purification box (1) and the premixing cylinder (8) in sequence and extends into the interior of the premixing cylinder (8). One end of the second air inlet pipe (10) passes through the purification box (1) and the premixing cylinder (8) in sequence and extends into the interior of the premixing cylinder (8). One end of both the first air inlet pipe (9) and the second air inlet pipe (10) is inclined. The shape of the baffle plate (19) is inclined.
4. An air purification device for a label production workshop according to claim 3, characterized in that: The recovery pulse mechanism includes a partition (20), with exhaust ports evenly distributed on the upper end of the partition (20). Filter cartridges (21) are connected to the lower end of the partition (20) at each of the multiple exhaust ports. A support plate (22) is connected to one side of the upper end of the purification box (1). A pulse cylinder (23) is connected to the upper end of the support plate (22). Gas supply pipes (24) are connected to one side of each pulse cylinder (23). One end of each gas supply pipe (24) extends through into the interior of the purification box (1). Pulse nozzles (25) are connected to the lower end of each gas supply pipe (24) at the upper end of each of the multiple filter cartridges (21). Each pulse nozzle (25) corresponds to a multiple filter cartridge (21).
5. An air purification device for a label production workshop according to claim 4, characterized in that: The purification and exhaust mechanism includes an exhaust pipe (26), and there are two exhaust pipes (26). One end of each exhaust pipe (26) is connected to the upper part of one side of the purification box (1). One end of each exhaust pipe (26) is connected to an exhaust pipe (27). One end of each exhaust pipe (27) is connected to an exhaust pipe (28). The lower end of each exhaust pipe (28) is connected to a first processing cylinder (29). The first processing cylinder (29) is equipped with a dehumidifying filter block (30). One side of the first processing cylinder (29) is connected to a conveying fan (31). The input end of the conveying fan (31) is connected to the lower end of the first processing cylinder (29). The output end of the conveying fan (31) is connected to a second processing cylinder (32). The second processing cylinder (32) is equipped with an activated carbon filter block (33).
6. An air purification device for a label production workshop according to claim 5, characterized in that: The waste heat recovery mechanism includes a connecting fan (34), which is connected to the lower part of the purification box (1) via a fixing plate. The input end of the connecting fan (34) is connected to an air inlet pipe (35), one end of which is connected to the upper part of the second processing cylinder (32). The output end of the connecting fan (34) is connected to a connecting pipe (37), the upper end of which extends through to the inside of the connecting sleeve (36). Air outlets (38) are provided on both sides of the connecting pipe (37) corresponding to the inside of the connecting sleeve (36). The upper end of the connecting pipe (37) is connected to a fixing pipe (39), one end of which is connected to one end of the pulse cylinder (23).
7. An air purification method for a label production workshop, comprising using the air purification device for a label production workshop as described in claim 6, characterized in that, The following usage steps are included: S1: The humid and hot organic waste gas generated at the printing station is introduced into the premixing cylinder (8) through the first air inlet pipe (9), and the paper dust gas generated at the die-cutting station is introduced into the premixing cylinder (8) through the second air inlet pipe (10); the two airflows impact the two inclined surfaces of the counter-impact baffle (16) respectively, and the counter-impact and collision mixing occurs at the bottom tip of the inverted V-shaped counter-impact baffle (16). The water vapor in the humid and hot organic waste gas is used to wet the paper dust and agglomerate it to form large particles of paper dust. S2: The mixed airflow carries large paper dust particles upward and flows out of the premixing cylinder (8) through the air outlet (18) on the top plate (17). After passing through the baffle plate (19) for equal flow, it enters the recovery pulse mechanism and is precisely filtered by the filter cartridge (21). The filtered clean gas enters the purification exhaust mechanism and is discharged after being purified by activated carbon adsorption. S3: The waste heat recovery mechanism recovers the heat gas discharged from the purification exhaust mechanism. Part of the recovered heat gas is introduced into the connecting jacket (36) to raise the temperature of the inner wall of the purification box (1) corresponding to the connecting jacket (36), thereby generating high temperature at the baffle plate (19) to dry the moisture in the airflow. The other part of the recovered heat gas enters the recovery pulse mechanism to perform pulse backflushing self-cleaning on the filter cartridge (21).