Furniture production dust filtering device with automatic dust cleaning function

Abstract

The application discloses a furniture production dust filtering device with automatic dust cleaning function and relates to the technical field of dust filtering devices.The device comprises a base, a filtering bin, a negative pressure device, a filtering cloth bag, a cover plate and a deformation driving mechanism.The deformation driving mechanism comprises a floating rod, a swing rod and a hinge rod.When the floating rod moves along the axial direction, the swing rod is swung through the hinge rod, so that the filtering cloth bag is switched between the stretched state and the contracted state.In the application, the swing rod is contracted, the filtering cloth bag is deformed, wrinkles are formed on the surface of the cloth bag, the physical deformation can forcibly destroy the adhesion between the dust agglomerates and the surface of the cloth bag, and the function of "rubbing" is realized.At the same time when the cloth bag is contracted, the bottom is rotated and twisted, and the action of manually "twisting" a towel is simulated.The torsion force can completely crush the agglomerated dust and strip the dust from the cloth bag, and the cleaning depth cannot be reached by simple back blowing and vibration.

Description

Technical Field

[0001] This invention relates to the field of dust filtration device technology, specifically to a furniture manufacturing dust filtration device with an automatic dust removal function. Background Technology

[0002] Furniture refers to a broad category of appliances and facilities essential for human beings to maintain normal life, engage in production practices, and carry out social activities; it mainly refers to large items such as wardrobes, tables, beds, and sofas. When furniture is produced, wood chips are refined into powder during cutting or sanding, and a large amount of dust is also generated during the furniture forming process, leading to the deterioration of the production environment. In order to optimize the production environment in real time and effectively, it is necessary to filter the dust generated during furniture processing.

[0003] Currently, when filtering dust, baghouse dust collectors are commonly used. This involves passing dust-laden air into the baghouse dust collector, then using a negative pressure system to extract the air. Under this negative pressure, the air passes through the filter bags and is discharged outside the baghouse dust collector, while the dust remains inside the baghouse dust collector after being filtered by the filter bags, thus achieving dust removal.

[0004] However, after a period of operation, a large amount of dust accumulates on the surface of the filter bags in baghouse dust collectors, requiring backflushing cleaning. Backflushing involves the airflow entering and passing through the bags to blow away the dust. To improve cleaning efficiency, existing technologies typically install vibrators on the bags to accelerate dust removal. However, when the production environment is humid, causing dust to clump together, vibration and backflushing alone are insufficient to effectively remove the clumps, leading to a decrease in the filter's filtration efficiency. Therefore, there is an urgent need for a dust collector that can effectively remove clumps of dust and improve filtration performance. Summary of the Invention

[0005] The purpose of this invention is to provide a furniture manufacturing dust filtration device with an automatic dust removal function to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a furniture manufacturing dust filtration device with automatic dust removal function, comprising a base, a filter chamber mounted on the base, a dust air inlet located on one side of the filter chamber, a negative pressure device mounted on the base, and a filter bag located inside the filter chamber. The top of the filter compartment is covered with a cover plate, and a deformation driving mechanism for driving the filter bag to deform is installed on the cover plate. The deformation driving mechanism includes a floating rod that is vertically slidably installed on the cover plate, a plurality of swing rods hinged to the lower end of the floating rod, and a hinge rod connecting the floating rod and the swing rods. The swing rod is connected to the inner wall of the filter bag; when the floating rod moves axially, it drives the swing rod to swing through the hinge rod, so that the filter bag switches between an open state and a contracted state.

[0007] Furthermore, a ring frame is fixedly connected to the downward-facing side of the cover plate, the upper end of the filter bag is fixedly connected to the ring frame, and a plurality of swing rods are hinged to the ring frame in a circumferential array along the ring frame, and the swing rods are located inside the filter bag; When the floating rod moves downward along the axial direction, the hinge rod pushes the swing rod to swing to a vertical state, causing the filter bag to open. When the floating rod moves upward along the axial direction, the hinge rod pulls the swing rod to retract, causing the filter bag to shrink.

[0008] Furthermore, a support base is vertically connected to the bottom wall of the inner cavity of the filter chamber, and a rotating column is rotatably connected to the support base. The upper end of the rotating column passes through the filter bag and extends into its inner cavity. The lower end of the floating rod is connected to a drive column, which is inserted into the rotating column, and the drive column and the rotating column are connected by a guide assembly. When the drive column moves axially with the floating rod, it drives the rotating column to rotate around its own axis through the guide assembly.

[0009] Furthermore, the guide assembly includes a shaped rolling groove disposed on the inner wall of the rotating column and a rolling part rotatably mounted on the drive column. The shaped rolling groove includes a straight groove extending along the axial direction and a spiral groove connected end to end of the straight groove. The rolling part is engaged in the shaped rolling groove. When the drive column moves upward with the floating rod, the rolling part rolls from the spiral groove to the straight groove, and drives the rotating column to rotate.

[0010] Furthermore, a floating ring is fitted on the rotating column, which can slide along its axial direction and is circumferentially limited to the rotating column. The bottom of the filter bag is provided with a perforation for the floating ring to pass through. The floating ring is provided with pressure plates that abut against the inner and outer surfaces of the bottom of the filter bag respectively. When the rotating column rotates, it drives the floating ring to rotate synchronously, causing the bottom of the filter bag to twist and deform.

[0011] Furthermore, a stop ring is fixedly sleeved on the upper end of the rotating column, and a return spring is wound around the rotating column. The two ends of the return spring elastically abut against the stop ring and the floating ring, respectively.

[0012] Furthermore, when the filter bag is in the open state, the tension at the bottom of the filter bag drives the floating ring to move upward against the elastic force of the reset spring; When the filter bag is in a contracted state, the reset spring releases elastic potential energy to drive the floating ring to move downwards to stretch the bottom of the filter bag.

[0013] Furthermore, a connecting chamber is fixedly connected to the top of the cover plate, and a cylinder is installed on the top of the connecting chamber. The cylinder rod penetrates the connecting chamber and is coaxially connected to the floating rod. The wall of the connecting chamber is provided with a backflush air inlet and an air outlet, and the air outlet is connected to the negative pressure device.

[0014] Furthermore, the lower end of the drive column is rotatably fitted with two rolling parts, which are symmetrically arranged along the axial direction of the drive column.

[0015] Furthermore, when the filter bag is in a contracted and twisted state at the bottom, the filter bag as a whole has an inverted conical structure that is wider at the top and narrower at the bottom, and the flow velocity of the backflushing airflow on the lower side of the filter bag increases.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This technology achieves a combined dust removal method of "mechanical rubbing + twisting," effectively solving the problem of cleaning damp, clumped dust: Existing technologies typically use vibrators or airflow backflushing, which are extremely ineffective for cleaning dust that clumps due to high humidity in furniture manufacturing environments. This technical solution creatively combines the "swing rod retraction" with the "bottom twisting" action: Mechanical kneading: The retraction action of the swing rod causes the filter bag to shrink and deform, forming multiple folds on the surface of the bag. This physical deformation can forcibly break the adhesion between dust clumps and the surface of the bag, thus playing a "kneading" role.

[0017] Bionic wringing: A creatively designed structure combining a floating ring and a rotating column allows the bottom of the bag to rotate and wring as it contracts, mimicking the action of manually "wringing out" a towel. This torque thoroughly breaks up clumps of dust and peels them off the bag, achieving a cleaning depth that simple backflushing and vibration cannot reach.

[0018] 2. A single power source drives multi-dimensional coordinated actions, with a compact structure and ingenious control logic. This solution utilizes only a single linear power source (cylinder) and, through a sophisticated mechanical transmission structure, achieves coordinated movement of the filter bag in two dimensions: "axial contraction" and "circumferential rotation." Axial contraction: The cylinder directly drives the floating rod, which in turn drives the swing rod to swing through the hinge rod, thereby opening and closing the bag.

[0019] Circumferential rotation: The innovative design utilizes the rolling part on the drive column and the spiral groove on the rotating column to convert linear upward motion into rotational motion. When the cylinder retracts (dust cleaning action), the filter bag automatically rotates while contracting.

[0020] This "one machine, two effects" design not only simplifies the circuit control system and reduces the failure rate, but also cleverly ensures the timing synchronization of the dust removal action.

[0021] 3. Optimize backflush efficiency using fluid dynamics principles During the dust removal process, the retracting swing rod causes the filter bag to form an inverted conical structure that is wider at the top and narrower at the bottom. According to the fluid continuity equation, this structural change automatically increases the velocity and pressure of the backflushing airflow at the lower end of the bag. Since the lower end of the bag is often the area where dust deposition is most severe and agglomeration is most likely to occur, the "pressure boosting effect" naturally created by this structure significantly improves the dust removal efficiency in heavily polluted areas, further enhancing the dust removal effect.

[0022] 4. Adaptive tension adjustment mechanism to balance filtration efficiency and dust removal effect. By using a combination of a return spring, a floating ring, and a stop ring, the bottom of the bag is given a "breathing" function. Filtration status: The filter bag is opened, and the bottom tension overcomes the spring force to move upward. The filter bag is in a standard cylindrical shape, which ensures maximum filtration area and low airflow resistance.

[0023] Dust removal process: The filter bag relaxes, and the spring releases its potential energy to push the floating ring downward, actively stretching the bottom of the filter bag. This not only enhances the mechanical peeling effect in conjunction with the twisting action, but also prevents the filter bag from partially stacking and jamming during rotation and twisting, ensuring the smoothness of the dust removal process. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of a furniture manufacturing dust filtration device with automatic dust removal function according to the present invention. Figure 2 for Figure 1 A schematic diagram showing the positional relationship of the structure from another perspective; Figure 3 This is a schematic diagram showing the positional relationship of the filter bag, cover plate, and floating rod after assembly in this invention. Figure 4 for Figure 3 A schematic diagram showing the positional relationship of the structure from another perspective; Figure 5 This is a schematic diagram of the drive column in the present invention; Figure 6 This is a schematic diagram of the rotating sleeve in this invention; Figure 7 for Figure 6A schematic diagram showing the positional relationship of the structure after it has been cut open.

[0025] The following are explanations of the reference numerals in the figures: 1. Base; 2. Filter chamber; 3. Dust air inlet; 4. Cover plate; 5. Connecting chamber; 6. Backflush air inlet; 7. Cylinder; 8. Pipeline; 9. Negative pressure device; 10. Air outlet; 11. Filter bag; 12. Drive column; 13. Stop ring; 14. Return spring; 15. Rotating column; 16. Support seat; 17. Floating ring; 18. Swing rod; 19. Hinge rod; 20. Ring frame; 21. Floating rod; 22. Rolling part; 23. Straight groove; 24. Spiral groove. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figures 1-7 This invention provides a technical solution: a furniture manufacturing dust filtration device with automatic dust removal function, comprising a base 1, a filter chamber 2 installed on the base 1, the filter chamber 2 having a cylindrical structure and an open top, a cover plate 4 connected to the top of the filter chamber 2 by screws, a connecting chamber 5 fixedly connected to the top of the cover plate 4, the connecting chamber 5 having an open bottom, and a connecting port on the cover plate 4 communicating with the connecting chamber 5 and the inner cavity of the filter chamber 2; a negative pressure device 9 also installed on the base 1, with a pipeline installed at the air inlet of the negative pressure device 9. 8. The wall of the connecting chamber 5 is provided with an air outlet 10, which is connected to the end of the pipeline 8 away from the negative pressure device 9, thereby connecting the air inlet of the negative pressure device 9 with the inner cavity of the connecting chamber 5. The wall of the connecting chamber 5 is also provided with a backflush air inlet 6, which is connected with the interior of the connecting chamber 5. The side wall of the filter chamber 2 is provided with a dust air inlet 3, which is connected with the inner cavity of the filter chamber 2. The dust air generated by the furniture production equipment enters the inner cavity of the filter chamber 2 through the dust air inlet 3. Combination Figures 1 to 7 As shown, and please refer to the following: Figure 3 and Figure 4A ring frame 20 is fixedly connected to the downward-facing side of the cover plate 4. The ring frame 20 is coaxial with the connecting port. Multiple swing rods 18 are hinged in an array along the axial direction on the downward-facing side of the ring frame 20. A filter bag 11 is fixedly connected to the lower surface of the ring frame 20. The filter bag 11 is coaxial with the ring frame 20, with the bag opening facing upward and communicating with the connecting port. The multiple swing rods 18 hinged on the ring frame 20 are located inside the filter bag 11, so that the filter bag 11 is fitted onto the swing rods 18. When the swing rod 18 swings downward to a vertical position, the filter bag 11 will be in an open state. The swing rod 18 and the filter bag 11 are fixedly connected together. Specifically, the filter bag 11 can be fixedly connected to the swing rod 18 by sewing, so that when the swing rod 18 swings, the filter bag 11 will be deformed accordingly. For example, when the swing rod 18 swings towards a closed state, the filter bag 11 will be in a contracted state. The upper end of the filter bag 11 is fixedly connected to the downward side of the ring frame 20. A cylinder 7 is installed at the top of the connecting chamber 5. The cylinder rod of the cylinder 7 penetrates the connecting chamber 5 and extends into the inner cavity of the connecting chamber 5. The cylinder rod of the cylinder 7 is coaxially connected to a floating rod 21. The lower end of the floating rod 21 is hinged to multiple hinge rods 19. The end of the hinge rod 19 away from the floating rod 21 is connected to the swing rod 18. Thus, when the cylinder rod of the cylinder 7 extends or shortens, it can drive the floating rod 21 to move downward or upward. When the floating rod 21 moves downward, it will cause the hinge rod 19 to drive the swing rod 18 to swing in an open state. Conversely, when the cylinder rod of the cylinder 7 shortens, it will cause the floating rod 21 to move upward. When the floating rod 21 moves upward, it will cause the hinge rod 19 to drive the swing rod 18 to swing in a closed state. When the swing rod 18 swings in an open state, it will cause the filter bag 11 to open. When the swing rod 18 swings in a closed state, it will cause the filter bag 11 to contract. Combination Figures 1 to 7 As shown, and please refer to the following: Figure 3 and Figure 4A support base 16 is vertically connected to the bottom wall of the inner cavity of the filter chamber 2. A rotating column 15 is coaxially rotatably connected to the top of the support base 16 via a bearing. The upper end of the rotating column 15 penetrates the filter bag 11 and extends into the inner cavity of the filter bag 11. A blind hole-type sliding hole is opened at the upper end of the rotating column 15. A drive column 12 is inserted into the sliding hole and can slide freely up and down in the sliding hole. The upper end of the drive column 12 is connected to the bottom of the floating rod 21 by a screw. The lower end of the drive column 12 rotates. Two rolling parts 22 are embedded in the ground. The two rolling parts 22 are symmetrically arranged along the axial direction of the drive column 12. The wall of the sliding hole is provided with an irregular rolling groove for the rolling parts 22 to engage. The irregular rolling groove includes a straight groove 23 and a spiral groove 24 from top to bottom. The straight groove 23 and the spiral groove 24 are connected end to end. When the drive column 12 moves downward, the rolling part 22 will roll from the straight groove 23 into the spiral groove 24. When the rolling part 22 rolls in the spiral groove 24, the rotating column 15 can rotate circumferentially. Combination Figures 1 to 7 As shown, and please refer to the following: Figure 3 and Figure 4 A floating ring 17 is fitted around the periphery of the rotating column 15. The floating ring 17 can slide freely along the axial direction of the rotating column 15. At the same time, the floating ring 17 is keyed to the periphery of the rotating column 15. The bottom of the filter bag 11 has a through hole for the floating ring 17 to pass through freely. Two pressure plates are fixedly fitted around the periphery of the floating ring 17. The two pressure plates are located on the inner and outer sides of the filter bag 11, respectively, and the two pressure plates abut against the inner and outer surfaces of the filter bag 11, respectively. In addition, when the floating ring 17 rotates, it can drive the bottom of the filter bag 11 to rotate synchronously, thereby making the bottom of the filter bag 11 twisted. Combination Figures 1 to 7 As shown, and please refer to the following: Figure 3 and Figure 4 A stop ring 13 is fixedly sleeved on the upper end of the rotating column 15, and a return spring 14 is wrapped around the periphery of the rotating column 15. The two ends of the return spring 14 elastically abut against the stop ring 13 and the floating ring 17 respectively in the direction of the elastic force. When the swing rod 18 swings towards the unfolded state, the swing rod 18 will open the filter bag 11, so that the filter bag 11 is opened. When the filter bag 11 is opened, the surface tension at its bottom increases, which allows the floating ring 17 to overcome the elastic resisting force of the return spring 14 and move upward by a certain stroke, so that the filter bag 11 is roughly cylindrical in shape. Conversely, when the swing rod 18 swings towards the closed state, the surface of the filter bag 11 becomes relaxed, and the tension at its bottom decreases, which releases the elastic potential energy stored in the return spring 14, thereby driving the floating ring 17 to move downward, so that the bottom of the filter bag 11 is stretched downward.

[0028] Working principle of the invention: During dust removal, the cylinder rod of cylinder 7 is extended, causing the floating rod 21 to move downwards. This allows the hinge rod 19 to drive the swing rod 18 to swing to a vertical position, thus opening the filter bag 11. As the filter bag 11 is opened, the surface tension at its bottom overcomes the elastic resistance of the return spring 14 against the floating ring 17, causing the floating ring 17 to slide upwards. This also allows the bottom of the filter bag 11 to open. This causes the filter bag 11 to be roughly cylindrical. At this time, the return spring 14 is compressed and accumulates elastic potential energy. The negative pressure device 9 is activated, which generates a negative pressure airflow in the filter chamber 2. The dust gas generated by the furniture production equipment will enter the filter chamber 2 through the dust air inlet 3. The dust is filtered by the filter bag 11 and then remains in the filter chamber 2. The clean air can pass through the filter bag 11 and be discharged to the connecting chamber 5. Then it enters the negative pressure device 9 through the pipeline 8 to achieve the filtration and purification of the dust air. After filtering for a period of time, dust will adhere to the surface of the filter bag 11. At this time, the negative pressure device 9 stops operating and then the external back-flushing gas delivery system is started. The back-flushing gas delivery system delivers back-flushing gas to the connecting chamber 5, so that the back-flushing gas enters the filter bag 11. The cylinder 7 is started, and the cylinder rod of the cylinder 7 is shortened, which in turn drives the floating rod 21 to move upward. This causes the hinge rod 19 to drive the swing rod 18 to swing towards the retracted state, which in turn causes the swing rod 18 to cause the filter bag 11 to shrink and deform. At this time, the surface of the filter bag 11 will relax and deform. In addition, the elastic potential energy of the return spring 14 is released, which drives the floating ring 17 to move downward. When the floating ring 17 moves downward, the bottom of the filter bag 11 will be stretched downward. When the floating rod 21 moves upward, it synchronously drives the drive column 12 to move upward. As the drive column 12 moves upward, it causes the rolling part 22 to roll within the spiral groove 24 towards the straight groove 23. While the rolling part 22 rolls within the spiral groove 24, the rotating column 15 rotates circumferentially because the drive column 12 is fixedly connected to the floating rod 21. This rotation of the rotating column 15 drives the floating ring 17 to rotate. Simultaneously, the floating ring 17 moves downward, resulting in the filter bag 11 having an overall inverted conical structure that is wider at the top and narrower at the bottom, with the bottom of the filter bag 11 in a twisted state. Furthermore, when the swing rod 18 deforms the filter bag 11, it is subjected to the force of the backflushing gas, causing multiple folds to form on the surface of the filter bag 11. During the formation of these folds, multiple folds are formed. This effectively removes dust that has clumped on the surface of the filter bag 11 and is difficult to blow away by the airflow. In addition, the twisted state formed at the bottom of the filter bag 11 can simulate the "wringing" principle in human hand washing. When the surface of the filter bag 11 loosens due to the retraction of the swing rod 18, the twisting and downward stretching deformation of the bottom of the filter bag 11 ensures that the filter bag 11 still has a large surface tension. During the twisting process, the dust clumps on the surface of the filter bag 11 can be thoroughly removed. When the back-blowing airflow flows inside the filter bag 11, which is wider at the top and narrower at the bottom, the flow velocity of the back-blowing airflow on the lower side of the filter bag 11 increases, which in turn makes the back-blowing pressure on the lower surface of the filter bag 11 greater. This results in a better cleaning effect for the dust that is most easily attached to the lower surface of the filter bag 11.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A furniture manufacturing dust filtration device with automatic dust removal function, comprising a base (1), a filter chamber (2) mounted on the base (1), a dust air inlet (3) disposed on one side of the filter chamber (2), a negative pressure device (9) mounted on the base (1), and a filter bag (11) disposed in the filter chamber (2), characterized in that... : The filter chamber (2) is covered with a cover plate (4), and a deformation driving mechanism for driving the filter bag (11) to deform is installed on the cover plate (4). The deformation driving mechanism includes a floating rod (21) that is vertically slidably installed on the cover plate (4), a plurality of swing rods (18) hinged to the lower end of the floating rod (21), and a hinge rod (19) connecting the floating rod (21) and the swing rods (18). The swing rod (18) is connected to the inner wall of the filter bag (11); when the floating rod (21) moves axially, it drives the swing rod (18) to swing through the hinge rod (19) so that the filter bag (11) switches between the open state and the contracted state.

2. The furniture manufacturing dust filtration device with automatic dust removal function according to claim 1, characterized in that, The cover plate (4) is fixedly connected to a ring frame (20) on the downward side. The upper end of the filter bag (11) is fixedly connected to the ring frame (20). A plurality of swing rods (18) are hinged to the ring frame (20) in a circumferential array along the ring frame (20), and the swing rods (18) are located inside the filter bag (11). When the floating rod (21) moves downward along the axial direction, the hinge rod (19) pushes the swing rod (18) to swing to a vertical state, so that the filter bag (11) is opened. When the floating rod (21) moves upward along the axial direction, the hinge rod (19) pulls the swing rod (18) to retract, causing the filter bag (11) to shrink.

3. A furniture manufacturing dust filtration device with automatic dust removal function according to claim 2, characterized in that, The bottom wall of the inner cavity of the filter chamber (2) is vertically connected to a support base (16), and a rotating column (15) is rotatably connected to the support base (16). The upper end of the rotating column (15) passes through the filter bag (11) and extends into its inner cavity. The lower end of the floating rod (21) is connected to a drive column (12), which is inserted into the rotating column (15), and the drive column (12) and the rotating column (15) are connected by a guide assembly. When the drive column (12) moves axially with the floating rod (21), it drives the rotating column (15) to rotate around its own axis through the guide assembly.

4. A furniture manufacturing dust filtration device with automatic dust removal function according to claim 3, characterized in that, The guide assembly includes a shaped rolling groove disposed on the inner wall of the rotating column (15) and a rolling part (22) rotatably mounted on the drive column (12). The shaped rolling groove includes a straight groove (23) extending along the axial direction and a spiral groove (24) connected end to end to the straight groove (23). The rolling part (22) is engaged in the shaped rolling groove. When the drive column (12) moves upward with the floating rod (21), the rolling part (22) rolls from the spiral groove (24) to the straight groove (23) and drives the rotating column (15) to rotate.

5. A furniture manufacturing dust filtration device with automatic dust removal function according to claim 4, characterized in that, The rotating column (15) is fitted with a floating ring (17) that can slide along its axial direction and is circumferentially limited to the rotating column (15). The bottom of the filter bag (11) is provided with a perforation for the floating ring (17) to pass through. The floating ring (17) is provided with pressure plates that abut against the inner and outer surfaces of the bottom of the filter bag (11). When the rotating column (15) rotates, it drives the floating ring (17) to rotate synchronously, so that the bottom of the filter bag (11) is twisted and deformed.

6. A furniture manufacturing dust filtration device with automatic dust removal function according to claim 5, characterized in that, A stop ring (13) is fixedly sleeved on the upper end of the rotating column (15), and a return spring (14) is wound around the rotating column (15). The two ends of the return spring (14) elastically abut against the stop ring (13) and the floating ring (17) respectively.

7. A furniture manufacturing dust filtration device with automatic dust removal function according to claim 6, characterized in that, When the filter bag (11) is in the open state, the tension at the bottom of the filter bag (11) drives the floating ring (17) to move upward against the elastic force of the reset spring (14); When the filter bag (11) is in a contracted state, the reset spring (14) releases elastic potential energy to drive the floating ring (17) to move downward to stretch the bottom of the filter bag (11).

8. A furniture manufacturing dust filtration device with automatic dust removal function according to claim 3, characterized in that, The top of the cover plate (4) is fixedly connected to a connecting chamber (5), and a cylinder (7) is installed on the top of the connecting chamber (5). The cylinder rod of the cylinder (7) penetrates the connecting chamber (5) and is coaxially connected to the floating rod (21). The wall of the connecting chamber (5) is provided with a backflush air inlet (6) and an air outlet (10), and the air outlet (10) is connected to the negative pressure device (9).

9. A furniture manufacturing dust filtration device with automatic dust removal function according to claim 5, characterized in that, The lower end of the drive column (12) is rotatably fitted with two rolling parts (22), and the two rolling parts (22) are symmetrically arranged along the axial direction of the drive column (12).

10. A furniture manufacturing dust filtration device with automatic dust removal function according to claim 5, characterized in that, When the filter bag (11) is in a contracted and twisted state at the bottom, the filter bag (11) has an overall inverted cone-shaped structure that is wider at the top and narrower at the bottom, and the flow velocity of the back-blowing airflow increases on the lower side of the filter bag (11).

Images