Pulse back-blowing dust filtering device suitable for furniture polishing process

Abstract

This application relates to the field of dust filtration technology, specifically disclosing a pulse-jet dust filtration device suitable for furniture sanding processes. The device includes a housing and a pulse-jet backflushing unit. The housing contains a tube sheet with multiple dust filtration mechanisms arranged in a matrix on the tube sheet. Each dust filtration mechanism has a corresponding backflushing pipe above it, and a one-way airflow mechanism connects the backflushing pipe to the tube sheet. Each dust filtration mechanism includes an annular plate at the bottom of the tube sheet, a cylindrical frame below the annular plate, and filter components on the outside of the frame. The frame has a perforated annular sidewall, a sealing frame that rotates inside the frame, and a driving component at the top of the frame. This application significantly improves the bottom cleaning effect of the filter bag through a pressure accumulation and instantaneous release mechanism. Simultaneously, the stepping rotating component drives the filter components to rotate stepwise during backflushing, achieving uniform wear and cleaning, effectively extending the filter bag's service life, and reducing equipment operating resistance and maintenance costs.

Description

Technical Field

[0001] This invention relates to the technical field of dust filtration, and more particularly to a pulse backflushing dust filtration device suitable for furniture sanding processes. Background Technology

[0002] Pulse jet dust filtration systems (also known as pulse bag filters) are widely used dust control equipment in furniture sanding processes. Their working principle is as follows: Dust-laden gas enters the dust hopper through the inlet of the dust collector. The airflow velocity decreases, and coarser dust particles settle into the hopper due to gravity, while finer dust particles rise with the airflow and adhere to the outer surface of the filter bags, forming a dust layer. Clean gas passes through the filter bags and enters the clean air chamber before being discharged. As filtration continues, the dust layer on the outside of the filter bags gradually thickens, leading to increased operating resistance. At this point, a pulse jet cleaning system is needed: compressed air is ejected at high speed through nozzles on the jet pipe, inducing surrounding air (secondary air) to enter the filter bags, causing the filter bags to expand rapidly and generate reverse acceleration, shaking off the dust layer adhering to the outside of the filter bags.

[0003] However, existing pulse jet dust filtration devices still have many shortcomings in practical applications. These can be summarized in the following aspects: Firstly, the bottom cleaning effect of the filter bags is poor. During the cleaning process, the energy of the pulse jet gradually decreases as it propagates from the bag opening to the bottom, resulting in uneven distribution of the peak pressure on the filter bag sidewalls along the length of the bag. The initial impact of the pulse jet on the filter bag plays a decisive role in cleaning, but compared to the initial impact, although a significant reverse airflow is formed at the bottom of the filter bag, it does not have a cleaning effect. When the pulse jet pressure or flow rate is insufficient, the cleaning force cannot reach the bottom of the filter bag, and the dust layer cannot be peeled off in time, causing local dust accumulation, which leads to a continuous increase in equipment resistance and uneven filter bag load.

[0004] Secondly, cleaning long filter bags is more difficult. To reduce the footprint of dust collectors and lower equipment and civil engineering costs, the length of filter bags is constantly increasing. However, as the length of the filter bags increases, cleaning the lower part of the bag becomes increasingly difficult. Due to the inherent characteristics of the jet airflow, long filter bags generally suffer from over-cleaning of the upper part and insufficient cleaning of the lower part during the cleaning process.

[0005] Thirdly, in conventional dust filtration, after the dust-laden gas enters the filter chamber through the inlet at the bottom of the side wall of the housing, the airflow is not completely uniformly distributed inside the housing; there is a dominant flow direction. Therefore, the side of the filter bag facing the direction of the dust-laden airflow (i.e., the windward side) consistently experiences greater dust impact and abrasion than the leeward side. This long-term directional abrasion causes the filter media fibers on the windward side of the filter bag to break and thin prematurely, leading to localized damage and forcing the entire filter bag to be scrapped prematurely. Summary of the Invention

[0006] In view of the problems existing in the prior art, a pulse backflushing dust filtration device suitable for furniture sanding process is proposed.

[0007] This application provides a pulse backflushing dust filtration device suitable for furniture sanding processes. Its purpose is to enable simultaneous backflushing and dust removal at different heights of the filter bag, avoiding incomplete dust removal at the bottom of the filter bag, and reducing filter bag wear.

[0008] The technical solution of the present invention is as follows: a pulse back-blowing dust filtration device suitable for furniture sanding process, including a housing and a pulse back-blowing device. A tube sheet is provided in the housing, and multiple dust filtration mechanisms are arranged in a matrix on the tube sheet. A back-blowing pipe is provided directly above each dust filtration mechanism, and the back-blowing pipe is connected to the pulse back-blowing device. A one-way air guide mechanism is provided between the back-blowing pipe and the tube sheet. The dust filtration mechanism includes a detachable ring plate at the bottom of the tube sheet. A cylindrical frame is arranged vertically downward on the ring plate. A filter component is arranged on the outer side of the frame. The annular sidewall of the frame has a uniformly hollowed-out design. A sealing frame is rotatably arranged on the inner side of the frame. A driving component is arranged on the top of the frame. When filtering dust, air passes normally through the hollowed-out parts of the frame. When backflushing the filter component, a one-way air guide mechanism seals the top of the frame. The driving component drives the sealing frame to rotate and then reset, temporarily sealing the hollowed-out parts of the frame.

[0009] Furthermore, the driving component includes a support frame detachably mounted on the inner wall of the frame near the top. A driving frame is rotatably connected through the support frame. A driving fan blade is connected to the top of the driving frame. A torsion spring is connected between the support frame and the driving fan blade, and the torsion spring is sleeved on the driving frame. The bottom of the driving frame is connected to the sealing frame. An arc-shaped limiting groove is provided at the lower end of the support frame. An "L"-shaped limiting rod is connected to the side wall of the driving frame. The other end of the limiting rod extends into the limiting groove. The first and last sections of the limiting groove are points A and B, respectively. The limiting rod is initially located at point A. When the limiting rod moves to point B, the sealing frame seals the hollow part of the frame.

[0010] Furthermore, the one-way air guide mechanism includes a one-way valve disposed on the backflush pipe, a sealing plug is slidably connected inside the backflush pipe, an air guide pipe is connected downward at the center of the sealing plug, the other end of the air guide pipe passes through the backflush pipe and is connected to a sealing disc, a return spring is connected between the lower end of the backflush pipe and the sealing plug, and the return spring is sleeved on the air guide pipe, a sealing plug is disposed inside the backflush pipe located below the one-way valve, the lower end of the sealing plug extends into the air guide pipe, and the sealing plug is slidably connected to the air guide pipe, and a magnetic suction element is also disposed on the perforated plate.

[0011] Furthermore, the magnetic attractor includes an electromagnet and a time delay switch symmetrically embedded in the upper part of the tube sheet about the skeleton. The electromagnet and the time delay switch are electrically connected. The sealing disc is made of metal and has a rubber ring at its edge.

[0012] Furthermore, the filter component includes an upper ring and a lower ring that are symmetrically and rotatably sleeved on the outside of the frame, and a filter screen is connected between the upper ring and the lower ring.

[0013] Furthermore, both the upper and lower ring bodies are rotatably connected to the outside of the frame via one-way sealed bearings. A toothed ring is connected to the upper end of the upper ring body, and a stepping rotary component is connected between the drive frame and the frame.

[0014] Furthermore, the stepping rotating component includes a drive bar disposed on the side wall of the drive frame, an arc-shaped drive opening is provided on the side wall of the frame, the side of the drive bar away from the drive frame passes through the drive opening and is connected to an arc-shaped drive plate, and the drive plate is slidably and sealed on the outer side wall of the frame, and a stepping component is also provided on the drive plate.

[0015] Furthermore, the stepper includes a toothed block that matches the toothed ring, the upper end of the toothed block is connected to a pressure rod, the other end of the pressure rod is movably disposed through the drive plate, the upper ends of the drive plate and the pressure rod are connected together to a tension spring, and the tension spring is sleeved on the pressure rod.

[0016] The beneficial effects of this invention are: During the backflushing process, the opening at the top of the filter bag is sealed, causing compressed air to accumulate pressure inside the bag. This pressure is then briefly released after the sealing frame seals the opening, resulting in a sudden, powerful impact that ejects the accumulated compressed air outwards through the opening. Compared to existing technologies where primary and secondary air mix and propagate along the filter bag's axial direction with gradually decreasing energy, this application utilizes a pressure accumulation and instantaneous release mechanism to uniformly apply the cleaning impact energy around the filter bag, avoiding insufficient bottom cleaning caused by energy attenuation along the bag's length. Simultaneously, the brief sealing of the opening allows for pressure accumulation within the bag before release, ensuring sufficient pressure to reach the lower part of the filter bag and effectively removing the dust layer accumulated at the bottom.

[0017] During each backflushing process, the filter components (upper ring, lower ring, and filter screen) are synchronously driven to rotate circumferentially relative to the frame. This rotational motion ensures that different areas on the circumference of the filter screen are alternately positioned on the windward side of the dust-laden airflow, avoiding the problem of the windward side being subjected to long-term impact and directional wear from high-concentration dust as in conventional fixed filter bags. The wear degree across the entire circumference of the filter screen tends to be uniform, preventing premature failure of the entire filter bag due to excessive wear in a certain localized area, thereby effectively extending the overall replacement cycle of the filter components.

[0018] During backflushing, the stepping rotary component drives the filter screen to rotate, applying circumferential shear force to the dust layer already formed on the outside of the filter screen. This shear force, in conjunction with the reverse pulsed airflow, breaks the adhesion between the dust layer and the filter surface, making residual dust easier to remove. Simultaneously, the rotation of the filter screen causes the impact position of the pulsed airflow on the filter surface to continuously change, preventing dust from continuously accumulating and compacting in a fixed area. This reduces residual resistance after cleaning, enabling the equipment to operate stably for extended periods at lower operating pressure differentials.

[0019] The intermittent sealing and instantaneous release of the sealing frame at the perforated areas, along with the step-by-step rotation of the filter screen during backflushing, are time-coordinated. When the pressure inside the frame reaches its maximum and is released instantaneously, the filter screen is rotating. This ensures a more balanced impact intensity of the jet airflow on different locations on the filter screen's circumference, avoiding the unevenness found in conventional technologies where the area directly facing the blowpipe experiences excessive impact while other areas are insufficiently cleaned. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram showing the positional relationship between the unidirectional airflow mechanism and the dust filtration mechanism inside the housing of the present invention. Figure 3 This is a schematic diagram of the dust filtration mechanism of the present invention; Figure 4 This is a cross-sectional view of the dust filtration mechanism of the present invention; Figure 5 This is a schematic diagram showing the structural relationship between the skeleton and the sealing frame of the present invention; Figure 6 This is a schematic diagram showing the structural relationship between the drive frame and the upper ring body of the present invention. Figure 1 ; Figure 7 This is a schematic diagram showing the structural relationship between the drive frame and the upper ring body of the present invention. Figure 2 ; Figure 8 This is a cross-sectional view of the one-way air guide mechanism of the present invention; Figure 9 For the present invention Figure 2 Enlarged view of section A.

[0021] In the picture: 1. Housing; 2. Pulse backflush device; 3. Perforated plate; 4. Backflush pipe; 5. Ring plate; 6. Frame; 7. Sealing frame; 8. Support frame; 9. Drive frame; 10. Drive fan blade; 11. Torsion spring; 12. Limiting groove; 13. Limiting rod; 14. One-way valve; 15. Sealing plug; 16. Air guide pipe; 17. Sealing disc; 18. Return spring; 19. Sealing plug; 20. Electromagnet; 21. Time delay switch; 22. Upper ring body; 23. Lower ring body; 24. Filter screen; 25. One-way sealed bearing; 26. Gear ring; 27. Drive bar; 28. Drive port; 29. ​​Drive plate; 30. Gear block; 31. Pressure rod; 32. Tension spring. Detailed Implementation

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Reference Figure 1-9 This invention provides a pulse-jet dust filtration device suitable for furniture sanding processes, comprising a housing 1 and a pulse-jet backflushing unit 2. A perforated plate 3 is installed inside the housing 1, dividing the interior of the housing 1 into upper and lower sections. The upper section of the perforated plate 3 is a clean air chamber, and the lower section is a filtration chamber. Multiple dust filtration mechanisms are arranged in a matrix on the perforated plate 3. A backflushing pipe 4 is positioned directly above each dust filtration mechanism. One end of the backflushing pipe 4 is connected to the pulse-jet backflushing unit 2, and the other end is suspended above the perforated plate 3 at a predetermined distance. A one-way airflow guide mechanism is provided between the backflushing pipe 4 and the perforated plate 3. Dust-laden gas enters the filtration chamber through the air inlet at the bottom of the side wall of the housing 1. After being filtered by the dust filtration mechanisms, the clean gas passes through the filter bags into the clean air chamber and is discharged through the air outlet, while the dust is trapped on the outer surface of the filter components.

[0024] The dust filtration mechanism includes a detachable ring plate 5 at the bottom of the tube sheet 3. The ring plate 5 has a circular structure, with its upper end face fitting against the lower end face of the tube sheet 3. The ring plate 5 is fixedly connected to the tube sheet 3 by bolts or other fasteners. A cylindrical frame 6 is vertically arranged on the ring plate 5, with its upper end fixedly connected to the ring plate 5 and its lower end open. A filter element is arranged on the outside of the frame 6, covering the annular sidewall of the frame 6. The filter element is used to trap dust particles in the dust-laden gas. The annular sidewall of the frame 6 has a uniformly perforated design, forming channels for gas to pass through. A sealing frame 7 is rotatably installed on the inside of the frame 6, with its outer wall fitting against the inner wall of the frame 6. The sealing frame 7 is used to selectively seal the perforations on the annular sidewall of the frame 6. A driving component is arranged on the top of the frame 6, located near the upper inner wall of the frame 6, below the tube sheet 3. During dust filtration, dust-laden gas enters the filter element from the outside, passing through the perforations of the frame 6 and flowing normally through them. The sealing frame 7 remains in its initial position and does not block the perforations. When backflushing the filter element, the one-way air guide mechanism blocks the top of the frame 6, preventing the compressed air ejected from the backflushing pipe 4 from directly exiting through the opening at the top of the frame 6. Driven by the compressed air, the driving component rotates and then resets the sealing frame 7. During the rotation of the sealing frame 7, the perforations of the frame 6 are briefly blocked, causing the compressed air to accumulate pressure inside the frame 6 before being suddenly released through the perforations, impacting the filter element.

[0025] The driving component includes a support frame 8 detachably mounted on the inner wall of the frame 6 near the top. The support frame 8 has a ring or cross-shaped structure, and its outer edge is fixedly connected to the inner wall of the frame 6. A drive frame 9 is rotatably connected through the support frame 8. The drive frame 9 is arranged along the axial direction of the frame 6 and can rotate relative to the support frame 8 around its own axis. A drive fan blade 10 is connected to the top of the drive frame 9. The drive fan blade 10 is located at the upper end of the drive frame 9, with its blade surface arranged horizontally and its blades extending radially. The drive fan blade 10 is used to receive the compressed airflow entering from the top of the frame 6 during backflush and converts the kinetic energy of the airflow into the rotational driving force of the drive frame 9. A torsion spring 11 is connected between the support frame 8 and the drive fan blade 10. The torsion spring 11 is sleeved on the drive frame 9. One end of the torsion spring 11 is fixedly connected to the support frame 8, and the other end is fixedly connected to the drive fan blade 10. The torsion spring 11 stores elastic potential energy when the drive fan blade 10 rotates and drives the drive frame 9 to reset after the airflow disappears. The bottom of the drive frame 9 is connected to the sealing frame 7. When the drive frame 9 rotates, it drives the sealing frame 7 to rotate synchronously. An arc-shaped limiting groove 12 is provided at the lower end of the support frame 8, and the limiting groove 12 extends circumferentially along the support frame 8. An "L"-shaped limiting rod 13 is connected to the side wall of the drive frame 9. One end of the limiting rod 13 is fixedly connected to the drive frame 9, and the other end extends into the limiting groove 12. The limiting rod 13 and the limiting groove 12 slide together. The limiting groove 12 is used to constrain the range of motion of the limiting rod 13, thereby limiting the rotation angle of the drive frame 9 and the sealing frame 7. The first and last sections of the limiting groove 12 are points A and B, respectively. The limiting rod 13 is initially located at point A. When the limiting rod 13 moves to point B, the sealing frame 7 seals the hollow part of the skeleton 6.

[0026] The one-way air guide mechanism includes a one-way valve 14 installed on the backflush pipe 4. The one-way valve 14 is located in the pipeline of the backflush pipe 4 and is used to control the one-way flow of compressed air along the backflush pipe 4 towards the perforated plate 3, preventing backflow of gas after backflushing. A sealing plug 15 is slidably connected inside the backflush pipe 4. The outer wall of the sealing plug 15 fits against the inner wall of the backflush pipe 4, and the sealing plug 15 can slide up and down along the axis of the backflush pipe 4. A guide pipe 16 is connected downwards at the center of the sealing plug 15. The upper end of the guide pipe 16 is fixedly connected to and passes through the sealing plug 15, while the lower end of the guide pipe 16 extends through the pipe wall of the backflush pipe 4 to the outside of the backflush pipe 4. The other end of the guide pipe 16 passes through the backflush pipe 4 and is connected to a sealing disc 17. The sealing disc 17 is located below the lower end of the backflush pipe 4, maintaining a distance from the upper surface of the perforated plate 3. The sealing disc 17 is used to move downwards during backflushing and seal the top opening of the frame 6. A return spring 18 is connected between the lower end of the backflush pipe 4 and the sealing plug 15. The return spring 18 is sleeved on the air guide pipe 16. The upper end of the return spring 18 abuts against the lower end of the backflush pipe 4, and the lower end of the return spring 18 abuts against the upper end of the sealing plug 15. The return spring 18 is used to drive the sealing plug 15 and the sealing disc 17 to return to their original positions after backflushing is completed. A sealing plug 19 is provided inside the backflush pipe 4 located below the one-way valve 14. The sealing plug 19 is fixedly installed on the inner wall of the backflush pipe 4 and is arranged along the axial direction of the backflush pipe 4. The lower end of the sealing plug 19 extends into the air guide tube 16, and the sealing plug 19 and the air guide tube 16 are in a sealing sliding connection. The sealing plug 19 is used to maintain the airtightness of the backflush tube 4 when the sealing plug 15 and the air guide tube 16 move up and down. At the same time, when the air guide tube 16 slides relative to the sealing plug 19, the sealing plug 19 can block the upper opening of the air guide tube 16. A magnetic suction device is also provided on the tube sheet 3. The magnetic suction device is used to generate a magnetic attraction force on the sealing disc 17 during backflush, assisting the sealing disc 17 to move downward and maintain the blocking state of the top opening of the skeleton 6.

[0027] The magnetic attraction component includes an electromagnet 20 and a time-delay switch 21 symmetrically embedded in the upper part of the tube sheet 3 about the frame 6. The electromagnet 20 and the time-delay switch 21 are respectively embedded inside the tube sheet 3. The upper surface of the electromagnet 20 is flush with the upper surface of the tube sheet 3, and the time-delay switch 21 is electrically connected to the electromagnet 20. When the electromagnet 20 is energized, it generates a magnetic attraction force. The time-delay switch 21 is used to control the duration of energization of the electromagnet 20. The sealing disc 17 is made of metal and can be attracted by the magnetic force generated by the electromagnet 20. A rubber ring is provided at the edge of the sealing disc 17, which surrounds the outer edge of the sealing disc 17. When the sealing disc 17 moves downward to fit against the top opening of the frame 6, the rubber ring abuts against the edge of the top opening of the frame 6, forming a seal.

[0028] The filter element includes an upper ring 22 and a lower ring 23 symmetrically and rotatably fitted around the outside of a frame 6. The upper ring 22 is located on the outer side of the frame 6 near the upper end, and the lower ring 23 is located on the outer side of the frame 6 near the lower end. Both the upper ring 22 and the lower ring 23 are circular ring structures. A filter screen 24 is connected between the upper ring 22 and the lower ring 23. The filter screen 24 is arranged along the outer periphery of the frame 6. The upper end of the filter screen 24 is fixedly connected to the upper ring 22, and the lower end of the filter screen 24 is fixedly connected to the lower ring 23. The filter screen 24 covers the annular sidewall of the frame 6 and is used to trap dust particles in the dust-laden gas.

[0029] Both the upper ring 22 and the lower ring 23 are rotatably connected to the outside of the frame 6 via one-way sealed bearings 25. The inner ring of the one-way sealed bearing 25 is fixedly connected to the frame 6, and the outer ring of the one-way sealed bearing 25 is fixedly connected to the upper ring 22 and the lower ring 23 respectively. The one-way sealed bearing 25 allows the upper ring 22 and the lower ring 23 to rotate unidirectionally relative to the frame 6 around the axis of the frame 6, and a seal is provided inside the bearing to prevent dust from entering the bearing. A toothed ring 26 is connected to the upper end of the upper ring 22. The toothed ring 26 is circumferentially arranged along the upper end face of the upper ring 22, and the teeth of the toothed ring 26 extend vertically upward. A stepping rotating component is connected between the drive frame 9 and the frame 6. The stepping rotating component is used to convert the continuous rotation of the drive frame 9 into a stepping intermittent motion when the drive frame 9 rotates, and to drive the upper ring 22, the lower ring 23, and the filter screen 24 to rotate stepwise relative to the frame 6.

[0030] The stepping rotary component includes a drive bar 27 disposed on the side wall of the drive frame 9, extending radially outward along the drive frame 9. An arc-shaped drive opening 28 is provided on the side wall of the frame 6, extending circumferentially and penetrating the side wall of the frame 6. The side of the drive bar 27 away from the drive frame 9 passes through the drive opening 28 and connects to an arc-shaped drive plate 29. The drive plate 29 is disposed on the outer side of the frame 6, extending circumferentially along the frame 6, with its inner wall fitting against the outer wall of the frame 6. The drive plate 29 rotates synchronously with the drive frame 9. The drive plate 29 is slidably and sealingly connected to the outer wall of the frame 6, maintaining a sealed fit between its inner wall and the outer wall of the frame 6 to prevent gas leakage from the drive opening 28. A stepping element is also disposed on the drive plate 29, which intermittently engages with the toothed ring 26 during the rotation of the drive plate 29, thereby driving the upper ring body 22 to rotate in a stepping manner.

[0031] The stepper includes a toothed block 30 that matches the toothed ring 26. The lower end of the toothed block 30 has a toothed structure that engages with the teeth of the toothed ring 26, and the cross-section of the toothed block 30 is triangular. A pressure rod 31 is connected to the upper end of the toothed block 30. The pressure rod 31 is arranged vertically, and its lower end is fixedly connected to the toothed block 30. The other end of the pressure rod 31 is movably inserted through the drive plate 29, and its upper end passes through the drive plate 29 and extends above it. A seal is provided between the pressure rod 31 and the drive plate 29. A tension spring 32 is connected to the upper ends of the drive plate 29 and the pressure rod 31. The tension spring 32 is sleeved on the pressure rod 31, with its upper end connected to the upper end of the pressure rod 31 and its lower end connected to the upper end face of the drive plate 29. The tension spring 32 is used to apply an elastic restoring force to the pressure rod 31 and the toothed block 30, so that the toothed block 30 maintains its tendency to mesh with the toothed ring 26. When the drive fan blade 10 drives the drive frame 9 to rotate counterclockwise under the action of airflow, the drive frame 9 drives the drive plate 29 to rotate through the drive bar 27, and the drive plate 29 then drives the toothed block 30 to rotate synchronously through the pressure rod 31. Due to the restriction of the one-way sealed bearing 25, the upper ring body 22 and the toothed ring 26 cannot enter the gear. When the toothed block 30 rotates counterclockwise, the inclined surface of the toothed block 30 will be subjected to force, causing the toothed block 30 to drive the pressure rod 31 to move upward and stretch the tension spring 32 until the toothed block 30 enters the next tooth position of the toothed ring 26. The tension spring 32 then pushes the toothed block 30 downward to reset through the pressure rod 31, and so on. When the torsion spring 11 drives the drive fan blade 10 to rotate clockwise to reset, the drive fan blade 10, through the transmission of the drive bar 27 and the drive plate 29, causes the pressure rod 31 to drive the toothed block 30 to rotate clockwise. Since the upper ring body 22 and the toothed ring 26 can rotate clockwise, the vertical surface of the toothed block 30 will push the toothed ring 26 to rotate clockwise, thereby driving the filter component to adjust its position on the frame 6.

[0032] The stepping rotating component, through the linkage between the drive frame 9 and the sealing frame 7, drives the drive plate 29 to rotate during each backflushing process. The stepping component on the drive plate 29 intermittently engages with the toothed ring 26 at the upper end of the upper ring body 22, thereby driving the upper ring body 22, filter screen 24, and lower ring body 23 to undergo circumferential displacement relative to the frame 6. Each backflushing causes the filter screen 24 to rotate by a preset angle, so that different areas on the circumference of the filter screen 24 are alternately positioned on the windward side. Areas that were originally subjected to high wear can be rotated to low wear areas through rotation, while areas that were originally on the leeward side are moved to the windward side to withstand dust impact. This cycle repeats continuously, resulting in a more uniform wear across the entire circumference of the filter screen 24. This prevents the entire filter bag from prematurely failing due to excessive wear in a localized area, significantly extending the overall replacement cycle of the filter components. Furthermore, this rotational motion applies a circumferential shear force to the dust layer already formed on the outer side of the filter screen 24. This shear force, combined with the reverse pulsed airflow, effectively breaks down the adhesion between the dust layer and the filter media surface, making it easier for previously firmly attached residual dust to peel off under the impact of the reverse airflow. Simultaneously, the rotation of the filter screen 24 causes the impact position of the pulsed airflow on its surface to continuously change, preventing dust from continuously accumulating and compacting in a fixed area. This reduces residual resistance after cleaning, allowing the equipment to maintain stable filtration performance even at lower operating pressure differentials. Working Principle: In dust filtration mode, the dust-laden gas passes through the filter screen 24 from the outside of the filter component and enters the perforated area of ​​the frame 6. The sealing frame 7 is in its initial position, and the perforated area of ​​the frame 6 is unobstructed. Clean gas passes through the interior of the frame 6 and enters the clean air chamber above the tube sheet 3 through the opening at the top of the frame 6. When the pressure difference of the filter component reaches the preset value, the pulse backflush 2 is activated, and compressed air is transported towards the tube sheet 3 through the backflush pipe 4. After the pressure inside the backflush pipe 4 increases, the sealing plug 15 and the air guide pipe 16 move downward under the action of air pressure, overcoming the elastic force of the return spring 18. The sealing disc 17 moves downward synchronously until it blocks the opening at the top of the frame 6. At the same time, the electromagnet 20 is energized and generates a magnetic attraction force on the sealing disc 17 to maintain the blocking state. Compressed air in the backflush pipe 4 passes through the one-way valve 14 and enters the space below the sealing plug 15 in the backflush pipe 4 through the gap between the sealing plug 15 and the air guide pipe 16. Then, it enters the sealed space at the top of the frame 6 through the lower end of the backflush pipe 4. The compressed air entering the frame 6 flows downward, driving the fan blade 10 to rotate the drive frame 9 under the action of airflow. The drive frame 9 rotates within a preset angle range through the cooperation of the limiting rod 13 and the limiting groove 12. The sealing frame 7 at the bottom of the drive frame 9 rotates synchronously and briefly seals the hollow part of the frame 6 during the rotation, causing the compressed air to accumulate pressure inside the frame 6.

[0033] When the limit rod 13 rotates from point A to point B, the sealing frame 7 reaches the maximum degree of sealing of the hollow part of the skeleton 6, the back-blowing pipe 4 stops blowing air, the air pressure inside the skeleton 6 is stable, and there is no longer any airflow exerting force on the drive fan blade 10. Then, the drive frame 9 rotates in the opposite direction to reset under the elastic force of the torsion spring 11, and the hollow part of the skeleton 6 opens instantly. The accumulated compressed air is suddenly released to the outside through the hollow part of the skeleton 6, generating a reverse impact on the filter component and shaking off the dust layer attached to the outside of the filter screen 24.

[0034] Simultaneously, during the counterclockwise rotation of the drive fan blade 10 and drive frame 9, the drive bar 27 drives the drive plate 29 to rotate synchronously via the drive port 28. The stepper on the drive plate 29 moves with the drive plate 29, and the toothed block 30 intermittently meshes with the toothed ring 26 under the action of the tension spring 32. At this time, the toothed ring 26 does not rotate. When the torsion spring 11 drives the drive fan blade 10 to rotate clockwise, the vertical surface of the toothed block 30 pushes the toothed ring 26 to rotate synchronously clockwise, and drives the upper ring body 22 to rotate. The upper ring body 22 drives the lower ring body 23 to rotate synchronously via the filter screen 24, causing the filter screen 24 to undergo circumferential displacement relative to the frame 6. After the backflushing is completed, the pulse backflushing device 2 stops supplying air, the sealing plug 15 and the sealing disc 17 reset upward under the action of the return spring 18, the electromagnet 20 is de-energized after a delay, and the device returns to the dust filtration state.

[0035] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A pulse backflushing dust filtration device suitable for furniture sanding processes, comprising a housing (1) and a pulse backflushing device (2), characterized in that: The box (1) is provided with a tube sheet (3), and multiple dust filtration mechanisms are arranged in a matrix on the tube sheet (3). A backflush pipe (4) is provided directly above each dust filtration mechanism, and the backflush pipe (4) is connected to the pulse backflush device (2). A one-way air guide mechanism is provided between the backflush pipe (4) and the tube sheet (3). The dust filtration mechanism includes a detachable ring plate (5) at the bottom of the tube sheet (3). A cylindrical frame (6) is arranged vertically downward on the ring plate (5). A filter component is arranged on the outside of the frame (6). The annular sidewall of the frame (6) is uniformly hollowed out. A sealing frame (7) is rotatably arranged on the inside of the frame (6). A driving component is arranged on the top of the frame (6). When the dust is filtered, the air passes normally through the hollow part of the frame (6). When the filter component is back-blown, the one-way air guide mechanism seals the top of the frame (6). The driving component drives the sealing frame (7) to rotate and then reset, temporarily sealing the hollow part of the frame (6).

2. The pulse backflushing dust filtration device for furniture sanding process according to claim 1, characterized in that: The driving component includes a support frame (8) detachably mounted on the inner wall of the frame (6) near the top. A drive frame (9) is rotatably connected through the support frame (8). A drive fan blade (10) is connected to the top of the drive frame (9). A torsion spring (11) is connected between the support frame (8) and the drive fan blade (10), and the torsion spring (11) is sleeved on the drive frame (9). The bottom of the drive frame (9) is connected to the sealing frame (7). An arc-shaped limiting groove (12) is opened at the lower end of the support frame (8). An "L"-shaped limiting rod (13) is connected to the side wall of the drive frame (9). The other end of the limiting rod (13) extends into the limiting groove (12). The first and last sections of the limiting groove (12) are points A and B, respectively. The limiting rod (13) is initially located at point A. When the limiting rod (13) moves to point B, the sealing frame (7) seals the hollow part of the frame (6).

3. The pulse backflushing dust filtration device for furniture sanding process according to claim 1, characterized in that: The one-way air guide mechanism includes a one-way valve (14) disposed on the backflush pipe (4). A sealing plug (15) is slidably connected inside the backflush pipe (4). An air guide pipe (16) is connected downward at the center of the sealing plug (15). The other end of the air guide pipe (16) passes through the backflush pipe (4) and is connected to a sealing disc (17). A return spring (18) is connected between the lower end of the backflush pipe (4) and the sealing plug (15). The return spring (18) is sleeved on the air guide pipe (16). A sealing plug (19) is disposed inside the backflush pipe (4) located below the one-way valve (14). The lower end of the sealing plug (19) extends into the air guide pipe (16). The sealing plug (19) is slidably connected to the air guide pipe (16). A magnetic suction element is also disposed on the perforated plate (3).

4. The pulse backflushing dust filtration device for furniture sanding process according to claim 3, characterized in that: The magnetic attraction component includes an electromagnet (20) and a time delay switch (21) symmetrically inlaid on the upper end of the flower plate (3) about the skeleton (6). The electromagnet (20) and the time delay switch (21) are electrically connected. The sealing disc (17) is made of metal and a rubber ring is provided at the edge of the sealing disc (17).

5. The pulse backflushing dust filtration device for furniture sanding process according to claim 2, characterized in that: The filter component includes an upper ring (22) and a lower ring (23) that are symmetrically sealed and rotated on the outside of the frame (6), and a filter screen (24) is connected between the upper ring (22) and the lower ring (23).

6. The pulse backflushing dust filtration device for furniture sanding process according to claim 5, characterized in that: The upper ring (22) and lower ring (23) are rotatably connected to the outside of the frame (6) via a one-way sealed bearing (25). The upper end of the upper ring (22) is connected to a toothed ring (26). A stepping rotating component is connected between the drive frame (9) and the frame (6).

7. The pulse backflushing dust filtration device for furniture sanding process according to claim 6, characterized in that: The stepping rotating component includes a drive bar (27) disposed on the side wall of the drive frame (9). An arc-shaped drive port (28) is provided on the side wall of the frame (6). The side of the drive bar (27) away from the drive frame (9) passes through the drive port (28) and is connected to an arc-shaped drive plate (29). The drive plate (29) is sealed and slidably connected to the outer side wall of the frame (6). A stepping component is also provided on the drive plate (29).

8. The pulse backflushing dust filtration device for furniture sanding process according to claim 7, characterized in that: The stepper includes a toothed block (30) that matches the toothed ring (26). The upper end of the toothed block (30) is connected to a pressure rod (31). The other end of the pressure rod (31) is movably connected through the drive plate (29). The upper ends of the drive plate (29) and the pressure rod (31) are connected to a tension spring (32), and the tension spring (32) is sleeved on the pressure rod (31).

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