Combined filter bag

Abstract

The utility model discloses a combined filter bag which comprises a fixing frame, a combination device is arranged below the fixing frame, the combination device comprises a first clamping sleeve, a second clamping sleeve, a connecting plate, an inner filter bag and an outer filter bag, the connecting plate is arranged on one side of the first clamping sleeve and one side of the second clamping sleeve, the inner filter bag is arranged on the inner side of the outer filter bag, and a quick change device is arranged on one side of the connecting plate. The quick-change device comprises a quick-change sleeve, a quick-change rod, a rotating sleeve, a rotating groove, a clamping groove and a clamping ball, the rotating groove is formed in the inner side of the rotating sleeve, the clamping groove is formed in the outer side of the quick-change rod, the clamping ball is arranged on the side wall of the quick-change sleeve, a locking mechanism is arranged on the outer side of the quick-change sleeve, and the locking mechanism comprises a longitudinal plate, a locking sleeve, a rotating plate, a transverse plate, a receding groove, a movable spring, a locking rod and a locking groove; according to the quick-changing device for the rotary sleeve, the maintenance cost of the device is reduced, the maintenance efficiency is improved, meanwhile, the structural stability is guaranteed, and therefore it is guaranteed that the device is stably used.

Description

Technical Field

[0001] This utility model relates to the field of filtration equipment technology, and more specifically, to a combined filter bag. Background Technology

[0002] In the field of baghouse dust collectors, existing filter bag designs suffer from serious technical defects and limitations in practical applications. These problems not only lead to resource waste but also significantly increase equipment maintenance costs and operational difficulties. Specifically, these technical challenges are mainly reflected in the following key aspects:

[0003] Firstly, in the operation of baghouse dust collectors, the filter bag, as the core filtration component, plays a crucial role. It typically uses a cylindrical structure and is vertically suspended on the tube sheet of the dust collector. However, existing filter bags generally adopt an integrated design, which has significant limitations. When a filter bag experiences localized damage during use, even a small damaged area can cause the entire bag to lose its normal filtration function. In such cases, the entire filter bag must be replaced, meaning that other intact parts of the filter bag must also be scrapped. This passive replacement method not only wastes a large amount of usable materials but also significantly increases the company's operating costs, which is extremely detrimental from both an economic and environmental perspective.

[0004] Secondly, in traditional filter bag designs, the installation and disassembly processes for replacing damaged filter bags are often quite difficult. These operations usually require specialized tools and equipment, and the entire replacement process is not only time-consuming but also requires a significant investment of human resources. This cumbersome maintenance method not only reduces the efficiency of equipment maintenance but also increases the workload of maintenance personnel. Especially in situations where filter bags need to be replaced frequently, this complex operating procedure can significantly affect the uptime of the equipment and reduce production efficiency.

[0005] More importantly, although some improved equipment has emerged on the market, attempting to simplify the filter bag replacement process by adding quick-release functions, these improved designs still have serious structural flaws. The main problem is that these simple quick-release structures are prone to stability issues during actual use. Specifically, when the dust collection system is running, the strong airflow continuously impacts the filter bags and their fixing structures. Coupled with the continuous vibration generated during the operation of the dust collector, these quick-release structures are prone to loosening. This lack of structural stability directly affects the fixing effect of the filter bags, causing the originally tight filter bags to gradually loosen during operation, seriously affecting the normal operation of the dust collection system. This technical defect not only reduces the reliability of the equipment but may also lead to a significant decrease in dust collection efficiency, affecting the stability and controllability of the entire dust collection system. Utility Model Content

[0006] One technical problem to be solved

[0007] In view of the problems existing in the prior art, this utility model provides a combined filter bag to solve the technical problems mentioned in the background art.

[0008] Two technical solutions

[0009] To achieve the above objectives, this utility model provides the following technical solution: a combined filter bag, comprising a fixing frame, characterized in that: a combination device is installed below the fixing frame, the combination device comprising a first clamping sleeve, a second clamping sleeve, a connecting plate, an inner filter bag, and an outer filter bag, the first and second clamping sleeves being detachably installed on the outside of the outer filter bag, the connecting plate being disposed on one side of the first and second clamping sleeves, the inner filter bag being detachably installed on the inside of the outer filter bag, a quick-change device being disposed on one side of the connecting plate, the quick-change device comprising a quick-change sleeve, a quick-change rod, a rotating sleeve, a rotating groove, a locking groove, and a locking ball, the quick-change sleeve being detachably sleeved on the outside of the quick-change rod, and the rotating sleeve being rotatably sleeved on the quick-change... The outer side of the sleeve has a rotating groove on the inner side of the sleeve, a retaining groove on the outer side of the quick-change rod, a retaining ball that rolls on the side wall of the quick-change sleeve, and a locking mechanism on the outer side of the quick-change sleeve. The locking mechanism includes a longitudinal plate, a locking sleeve, a rotating plate, a horizontal plate, a clearance groove, a movable spring, a locking rod, and a locking groove. The longitudinal plate is fixedly connected to one side of the locking sleeve, the locking sleeve is slidably sleeved on the outer side of the quick-change sleeve, the rotating plate is rotatably sleeved on the outer side of the quick-change sleeve, the horizontal plate is connected to one side of the longitudinal plate, the clearance groove is opened on the rotating plate, one end of the locking rod is connected to the outer wall of the sleeve through the movable spring, and the other end of the locking rod is inserted into the locking groove. Multiple locking grooves are opened on the outer wall of the quick-change sleeve.

[0010] The present invention is further configured such that a compression spring is movably provided inside the quick-change sleeve, and one end of the compression spring is in contact with the top end of the quick-change rod.

[0011] The present invention is further configured such that a push spring is connected to one side of the locking sleeve, and the other end of the push spring is in contact with the rotating plate.

[0012] The present invention is further configured such that one end of the inner filter bag is detachably provided with an inner bottom bag, and one end of the outer filter bag is detachably provided with an outer bottom bag.

[0013] The present invention is further configured such that a rotating shaft is connected to one side of the first card sleeve, and the second card sleeve is movably connected to the first card sleeve through the rotating shaft.

[0014] The present invention is further configured such that rubber rings are connected to one side of the top of the outer filter bag, both sides of the bottom of the inner filter bag, one side of the top of the outer bottom bag, and one side of the bottom of the fixing frame. Sealing grooves are provided on both sides of the top of the inner bottom bag, one side of the bottom of the outer filter bag, and both sides of the top of the inner filter bag. The sealing grooves are adapted to the rubber rings. The setting of the rubber strips and sealing grooves ensures the sealing of the splice and ensures the normal use of the equipment.

[0015] The present invention is further configured such that a support plate is provided on the outer side of the inner bottom bag and the inner side of the outer bottom bag, and a support spring is provided on one side of the support plate. The two ends of the support spring are respectively connected to the support plate. The support plate and the support spring provide support and separation for the inner bottom bag and the outer bottom bag.

[0016] The present invention is further configured such that through holes are provided on the support plate, and the through holes ensure the normal operation of the filtration process.

[0017] Three beneficial effects

[0018] Compared with the prior art, the present invention provides a combined filter bag, which has the following beneficial effects:

[0019] 1. The combined device achieves a modular design of the filter bag through the scientific combination of components such as the first clamping sleeve, the second clamping sleeve, the connecting plate, the inner filter bag, and the outer filter bag. This allows for the replacement of only the inner or outer filter bag when a part of the filter bag is damaged, eliminating the need to replace the entire filter bag. The double-layer structure of the inner and outer filter bags provides reliable filtration. The combined use of the inner and outer bottom bags ensures that the equipment can still be used normally even if a single filter bag is damaged, fundamentally solving the technical problems of waste and high cost in replacing traditional integrated filter bags.

[0020] 2. The quick-change device adopts an innovative combination of components such as quick-change sleeve, quick-change rod, rotating sleeve, rotating groove, card slot and carding ball. The movement of the carding ball is restricted by the linkage mechanism of the rotating sleeve and rotating groove. With the action of the compression spring, the quick-change sleeve and quick-change rod can be quickly disassembled and assembled. At the same time, the spherical design of the carding ball and card slot ensures the smooth operation of the device. No additional tools are needed for disassembly and assembly, which improves the replacement efficiency and completely overcomes the technical defects of traditional equipment in the process of cumbersome operation during filter bag disassembly and assembly.

[0021] 3. The locking mechanism, through the ingenious design of components such as the longitudinal plate, locking sleeve, rotating plate, horizontal plate, clearance groove, movable spring, locking rod, and locking slot, constructs a complete locking system. The cooperation between the rotating plate and the clearance groove achieves a reliable locking effect, while the push spring provides a stable restoring force. The arrangement of the horizontal and longitudinal plates ensures the reliability of the locking sleeve's limit position. The locking sleeve provides a stable limit position for the locking rod 19, and the cooperation between the locking rod 19 and the locking slot 20 achieves precise locking of the rotating sleeve, ensuring the structural stability of the quick-change device. This completely solves the structural loosening problem existing in traditional equipment and ensures the stability and reliability of the filter bag fixation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a combined filter bag according to the present invention;

[0023] Figure 2 for Figure 1 A magnified schematic diagram of the partial structure at point A in the middle;

[0024] Figure 3 This is a cross-sectional structural diagram of the inner bottom bag and outer bottom bag in this utility model;

[0025] Figure 4 This is a cross-sectional view of the support plate and support spring in this utility model.

[0026] Figure 5 This is a cross-sectional structural diagram of the quick-change device and locking mechanism in this utility model;

[0027] Figure 6 for Figure 5 A magnified view of the structure at point B in the middle;

[0028] Figure 7 This is a schematic diagram of the structure of the transfer sleeve part in this utility model.

[0029] In the diagram: 1. Fixing frame; 2. First clamping sleeve; 3. Second clamping sleeve; 4. Connecting plate; 5. Inner filter bag; 6. Outer filter bag; 7. Quick-change sleeve; 8. Quick-change rod; 9. Rotating sleeve; 10. Rotating groove; 11. Slot; 12. Ball clamp; 13. Vertical plate; 14. Locking sleeve; 15. Rotating plate; 16. Horizontal plate; 17. Relief groove; 18. Movable spring; 19. Locking rod; 20. Locking groove; 21. Compression spring; 22. Push spring; 23. Inner bottom bag; 24. Outer bottom bag; 25. Rotating shaft; 26. Rubber ring; 27. Sealing groove; 28. Support plate; 29. ​​Support spring; 30. Through hole. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0032] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0033] Please see Figures 1-7 A modular filter bag includes a fixing frame 1, with a combination device installed below the fixing frame 1. The combination device includes a first clamping sleeve 2, a second clamping sleeve 3, a connecting plate 4, an inner filter bag 5, and an outer filter bag 6. The first clamping sleeve 2 and the second clamping sleeve 3 are detachably installed on the outside of the outer filter bag 6. The connecting plate 4 is located on one side of the first clamping sleeve 2 and the second clamping sleeve 3. The inner filter bag 5 is detachably installed on the inside of the outer filter bag 6. A quick-change device is provided on one side of the connecting plate 4. The quick-change device includes a quick-change sleeve 7, a quick-change rod 8, a rotating sleeve 9, a rotating groove 10, a locking groove 11, and a locking ball 12. The quick-change sleeve 7 is detachably sleeved on the outside of the quick-change rod 8, the rotating sleeve 9 is rotatably sleeved on the outside of the quick-change sleeve 7, the rotating groove 10 is opened on the inside of the rotating sleeve 9, and the locking groove 11 is opened on the outside of the rotating sleeve 9. On the outside of the quick-change lever 8, the locking ball 12 is rolled on the side wall of the quick-change sleeve 7. A locking mechanism is provided on the outside of the quick-change sleeve 7. The locking mechanism includes a longitudinal plate 13, a locking sleeve 14, a rotating plate 15, a horizontal plate 16, a clearance groove 17, a movable spring 18, a locking rod 19, and a locking groove 20. The longitudinal plate 13 is fixedly connected to one side of the locking sleeve 14. The locking sleeve 14 is slidably sleeved on the outside of the quick-change sleeve 7. The rotating plate 15 is rotatably sleeved on the outside of the quick-change sleeve 7. The horizontal plate 16 is connected to one side of the longitudinal plate 13. The clearance groove 17 is opened on the rotating plate 15. One end of the locking rod 19 is connected to the outer wall of the rotating sleeve 9 through the movable spring 18. The other end of the locking rod 19 is inserted into the locking groove 20. Multiple locking grooves 20 are opened on the outer wall of the quick-change sleeve 7.

[0034] A compression spring 21 is movably provided inside the quick-change sleeve 7, and one end of the compression spring 21 is in contact with the top end of the quick-change rod 8.

[0035] A push spring 22 is connected to one side of the locking sleeve 14, and the other end of the push spring 22 is in contact with the rotating plate 15.

[0036] In this embodiment, when one of the outer filter bags 6 or the inner filter bag 5 is damaged and needs to be replaced, firstly, the rotating plate 15 is rotated, causing the relief groove 17 to rotate. When the relief groove 17 rotates to the position corresponding to the horizontal plate 16, it pushes the locking sleeve 14. The locking sleeve 14 will cause the vertical plate 13 and the horizontal plate 16 to gradually pass through the relief groove 17, and the locking sleeve 14 will cooperate with the rotating plate 15 to compress the push spring 22. When the push spring 22 is compressed to its limit, at this time, the corresponding horizontal plate 16 just passes through the relief groove 17 and moves to the other side of the rotating plate 15. Then, the rotating plate 15 is rotated again, so that the rotating plate 15 causes the relief groove 17 to move to a position that does not correspond to the horizontal plate 16. At this time, the vertical plate 13 and the corresponding horizontal plate 16 cooperate to limit the locking sleeve 14 to one side of the rotating plate 15. Then, rotating sleeve 9 rotates clockwise, causing locking rod 19, which is slidably mounted on the side wall, to move. The side wall of locking groove 20 then presses against one end of locking rod 19. Due to the rounded corners at the edge of the side wall of locking groove 20 and the rounded corner design at the end of locking rod 19, one end of locking rod 19 slides out of locking groove 20, and the other end of locking rod 19 stretches the movable spring 18. Simultaneously, rotating sleeve 9 causes the inner rotating groove 10 to rotate. Due to the special variable-diameter structure design of rotating groove 10, when rotating groove 10 rotates, compression spring 21 gradually pushes quick-change rod 8 to move, causing the side wall of slot 11 to press against the outer wall of ball 12. Due to the spherical design of ball 12, ball 12 gradually rolls out of slot 11 and gradually enters rotating groove 10. When the ball... After ball 12 completely rolls out of slot 11, quick-change lever 8 and quick-change sleeve 7 are no longer engaged. Then, pull quick-change sleeve 7 and quick-change lever 8 up and down respectively to remove them. Next, remove the other corresponding quick-change sleeves 7 and quick-change levers 8. Then, rotate the first sleeve 2 and the second sleeve 3 so that they rotate outwards along the pivot 25, so that the first sleeve 2 and the second sleeve 3 no longer press and fix the inner filter bag 5 and the outer filter bag 6. Then, replace the corresponding inner filter bag 5 or outer filter bag 6. After replacement, reinstall the replaced inner filter bag 5 or outer filter bag 6 into the corresponding position, and then let the first sleeve 2 and the second sleeve 3 press and fix the inner filter bag 5 and outer filter bag 6 again. Finally, let quick-change lever 8 disengage from connecting plate 4. One side passes through the pre-drilled mounting hole, and then the quick-change sleeve 7 is fitted onto the outside of the quick-change rod 8 from the other side of the connecting plate 4, so that the quick-change sleeve 7 and the quick-change rod 8 compress the compression spring 21 again. When the compression spring 21 is compressed to its limit, the rotating sleeve 9 is reversed. The rotating sleeve 9 will drive the locking rod 19 and the rotating groove 10 to rotate and reset. Then, the inner wall of the rotating groove 10 compresses the outer wall of the retaining ball 12, so that the retaining ball 12 is re-entered into the retaining groove 11. When the retaining ball 12 is fully inserted into the retaining groove 11, the movable spring 18 just drives the locking rod 19 to reset, and one end of the locking rod 19 is re-inserted into the original locking groove 20. Then, the rotating plate 15 is rotated again, so that the rotating plate 15 drives the relief groove 17 to rotate again. When the relief groove 17 moves again to the position corresponding to the horizontal plate 16,The push spring 22 pushes the locking sleeve 14 to slide and reset. The locking sleeve 14 then drives the longitudinal plate 13 and the transverse plate 16 to slide and reset. After the push spring 22 is fully reset, the two transverse plates 16 are positioned on either side of the rotating plate 15. The rotating plate 15 is then rotated again, causing the clearance groove 17 to move to a position not corresponding to the transverse plate 16. At this point, the longitudinal plate 13 and the two transverse plates 16 cooperate to limit the locking sleeve 14 to one side of the rotating plate 15, preventing it from sliding. The inner wall of the locking sleeve 14 then again limits the outer end of the locking rod 19, preventing it from moving. Finally, the locking rod 19 and the locking groove 20 cooperate to limit the rotating sleeve 9, preventing it from moving. This ensures the stability of the fixed structure, prevents structural loosening due to airflow impact, and guarantees the stable operation of the equipment.

[0037] Please see Figures 1-4 As a further implementation of the overall equipment: one end of an inner filter bag 5 is detachably provided with an inner bottom bag 23, and one end of an outer filter bag 6 is detachably provided with an outer bottom bag 24.

[0038] The first card sleeve 2 is connected to a rotating shaft 25 on one side, and the second card sleeve 3 is movably connected to the first card sleeve 2 through the rotating shaft 25.

[0039] Rubber rings 26 are connected to one side of the top of the outer filter bag 6, both sides of the bottom of the inner filter bag 5, one side of the top of the outer bottom bag 24, and one side of the bottom of the fixing frame 1. Sealing grooves 27 are opened on both sides of the top of the inner bottom bag 23, one side of the bottom of the outer filter bag 6, and both sides of the top of the inner filter bag 5. The sealing grooves 27 are adapted to the rubber rings 26.

[0040] Support plates 28 are provided on the outer side of the inner bottom bag 23 and the inner side of the outer bottom bag 24. A support spring 29 is provided on one side of the support plate 28, and the two ends of the support spring 29 are connected to the support plate 28 respectively.

[0041] A through hole 30 is provided on the support plate 28.

[0042] More specifically, when using this equipment, during the dust collector's operation, the air first undergoes primary filtration through the outer filter bag 6 and outer bottom bag 24. The support spring 29 and support plate 28 support and separate the inner bottom bag 23 and outer bottom bag 24. The purpose of the through hole 30 on the support plate 28 is to prevent interference with the normal operation of the filtration process. Then, the air after the first filtration undergoes secondary filtration through the inner filter bag 5 and inner bottom bag 23. Firstly, the double-layer structure design of the inner filter bag 5 and outer filter bag 6, as well as the double-layer structure design of the inner bottom bag 23 and outer bottom bag 24, ensures that even if the outer filter bag 6 or inner filter bag 5 is damaged, the filtration process can continue as usual. Secondly, the multi-segment design of the inner filter bag 5 and outer filter bag 6 means that when a part is damaged, only the inner filter bag 5 or outer filter bag 6 needs to be replaced, without having to replace the entire filter bag, thus reducing the equipment's maintenance costs.

[0043] In summary, during the use or operation of the overall equipment: when one of the outer filter bags 6 or inner filter bags 5 is damaged and needs to be replaced, first rotate the rotating plate 15. The rotating plate 15 drives the relief groove 17 to rotate. When the relief groove 17 rotates to the position corresponding to the horizontal plate 16, it pushes the locking sleeve 14. The locking sleeve 14 will drive the vertical plate 13 and the horizontal plate 16 to gradually pass through the relief groove 17. The locking sleeve 14 will cooperate with the rotating plate 15 to compress the push spring 22. When the push spring 22 is compressed to its limit, the corresponding horizontal plate 16 just passes through the relief groove 17 and moves to the other side of the rotating plate 15. Then, continue to rotate the rotating plate 15 so that the rotating plate 15 drives the relief groove 17 to a position that does not correspond to the horizontal plate 16. At this time, the vertical plate 13 and the corresponding horizontal plate 16 cooperate to lock. Sleeve 14 is positioned to one side of rotating plate 15. Then, rotating sleeve 9 rotates clockwise. Rotating sleeve 9 will cause locking rod 19, which is slidably mounted on the side wall, to move. Then, the side wall of locking groove 20 presses against one end of locking rod 19. Due to the rounded corner treatment at the edge of the side wall of locking groove 20 and the rounded corner design at the end of locking rod 19, one end of locking rod 19 slides out of locking groove 20, and the other end of locking rod 19 will cause movable spring 18 to stretch. At the same time, rotating sleeve 9 will cause the inner rotating groove 10 to rotate. Due to the special variable diameter structure design of rotating groove 10, when rotating groove 10 rotates, compression spring 21 will gradually push quick-change rod 8 to move, causing the side wall of slot 11 to press against the outer wall of ball 12. Due to the spherical design of ball 12, ball 12 will gradually roll out of slot 11. The ball 12 rolls out of the slot 11 and gradually enters the rotating groove 10. After the ball 12 rolls out of the slot 11 completely, the quick-change lever 8 and quick-change sleeve 7 are no longer engaged. Then, pull the quick-change sleeve 7 and quick-change lever 8 up and down to remove them respectively. Then, remove the other corresponding quick-change sleeves 7 and quick-change levers 8. Then, rotate the first sleeve 2 and the second sleeve 3 so that the first sleeve 2 and the second sleeve 3 rotate outward along the rotating shaft 25, so that the first sleeve 2 and the second sleeve 3 no longer press and fix the inner filter bag 5 and the outer filter bag 6. Then, replace the corresponding inner filter bag 5 or outer filter bag 6. After replacement, reinstall the replaced inner filter bag 5 or outer filter bag 6 into the corresponding position. Then, make the first sleeve 2 and the second sleeve 3 re-enter the inner filter bag 5 and the outer filter bag 6. The quick-change rod 8 is then pressed and fixed, and then passes through the pre-drilled mounting hole from one side of the connecting plate 4. Next, the quick-change sleeve 7 is fitted onto the outside of the quick-change rod 8 from the other side of the connecting plate 4, causing the quick-change sleeve 7 and quick-change rod 8 to compress the compression spring 21 again. When the compression spring 21 is compressed to its limit, the rotating sleeve 9 is reversed. The rotating sleeve 9 will drive the locking rod 19 and the rotating groove 10 to rotate and reset. Then, the inner wall of the rotating groove 10 presses against the outer wall of the retaining ball 12, causing the retaining ball 12 to re-enter the retaining groove 11. When the retaining ball 12 is fully engaged in the retaining groove 11, the movable spring 18 just drives the locking rod 19 to reset, causing one end of the locking rod 19 to re-insert into the original locking groove 20. Then, the rotating plate 15 is rotated again, causing the displacement groove 17 to rotate.When the clearance groove 17 moves back to the position corresponding to the horizontal plate 16, the push spring 22 pushes the locking sleeve 14 to slide and reset. Then, the locking sleeve 14 drives the vertical plate 13 and the horizontal plate 16 to slide and reset. After the push spring 22 is fully reset, the other two horizontal plates 16 are exactly on both sides of the rotating plate 15. Then, the rotating plate 15 is rotated again, causing the clearance groove 17 to move to a position that does not correspond to the horizontal plate 16. At this time, the vertical plate 13 and the two horizontal plates 16 cooperate to limit the locking sleeve 14 to one side of the rotating plate 15, so that the locking sleeve 14 will not slide. Then, the inner wall of the locking sleeve 14 again limits the outer end of the locking rod 19, so that the locking rod 19 will not move. Then, the locking rod 19 and the locking groove 20 cooperate to limit the rotating sleeve 9, so that the rotating sleeve 9 will not move, thereby ensuring the stability of the fixed structure and preventing the structure from loosening due to airflow impact, thus ensuring the stable operation of the equipment.

[0044] When using this equipment, during the dust collector's operation, the air first undergoes primary filtration through the outer filter bag 6 and outer bottom bag 24. The support spring 29 and support plate 28 support and separate the inner bottom bag 23 and outer bottom bag 24. The purpose of the through hole 30 on the support plate 28 is to prevent interference with the normal operation of the filtration process. Then, the air after the primary filtration undergoes secondary filtration through the inner filter bag 5 and inner bottom bag 23. The double-layer structure design of the inner filter bag 5 and outer filter bag 6, as well as the double-layer structure design of the inner bottom bag 23 and outer bottom bag 24, ensures that even if the outer filter bag 6 or inner filter bag 5 is damaged, filtration can continue as usual. Furthermore, the multi-segment design of the inner filter bag 5 and outer filter bag 6 means that when a part is damaged, only the inner filter bag 5 or outer filter bag 6 needs to be replaced, without having to replace the entire filter bag, thus reducing the equipment's maintenance costs.

[0045] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model 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 this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A combined filter bag comprising a holder (1), characterized in that: The lower part of the fixing frame (1) is provided with a combination device, which comprises a first clamping sleeve (2), a second clamping sleeve (3), a connecting plate (4), an inner filter bag (5) and an outer filter bag (6). The connecting plate (4) is arranged on one side of the first clamping sleeve (2) and the second clamping sleeve (3). The inner filter bag (5) is arranged on the inner side of the outer filter bag (6). The connecting plate (4) is provided with a quick-change device on one side. The quick-change device comprises a quick-change sleeve (7), a quick-change rod (8), a rotating sleeve (9), a rotating groove (10), a clamping groove (11) and a clamping ball (12). The rotating sleeve (9) is arranged on the outer side of the quick-change sleeve (7). The rotating groove (10) is arranged on the inner side of the rotating sleeve (9). The clamping groove (11) is arranged on the outer side of the quick-change rod (8). The clamping ball (12) is arranged on the side wall of the quick-change sleeve (7). The outer side of the quick-change sleeve (7) is provided with a locking mechanism. The locking mechanism comprises a vertical plate (13), a locking sleeve (14), a rotating plate (15), a horizontal plate (16), a clearance groove (17), a movable spring (18), a locking rod (19) and a locking groove (20). The vertical plate (13) is connected to one side of the locking sleeve (14). The horizontal plate (16) is connected to one side of the vertical plate (13). The clearance groove (17) is arranged on the rotating plate (15). One end of the locking rod (19) is connected to the outer wall of the rotating sleeve (9) through the movable spring (18). A plurality of locking grooves (20) are arranged on the outer wall of the quick-change sleeve (7).

2. The combination filter bag of claim 1 wherein: The inner side of the quick-change sleeve (7) is movably provided with an extrusion spring (21). One end of the extrusion spring (21) is in contact with the top end of the quick-change rod (8).

3. The combination filter bag of claim 1 wherein: The side of the locking sleeve (14) is provided with a push spring (22). The other end of the push spring (22) is in contact with the rotating plate (15).

4. A combination filter bag as claimed in any one of claims 1 to 3 wherein one of the filter bags is a filter bag of the type comprising a filter element and a filter bag body. One end of the inner filter bag (5) is detachably provided with an inner bottom bag (23). One end of the outer filter bag (6) is detachably provided with an outer bottom bag (24).

5. A combination filter bag according to claim 4, characterised in that: One side of the first clamping sleeve (2) is provided with a rotating shaft (25). The second clamping sleeve (3) is movably connected to the first clamping sleeve (2) through the rotating shaft (25).

6. A combination filter bag according to claim 5, characterised in that: The top side of the outer filter bag (6), the bottom side of the inner filter bag (5), the top side of the outer bottom bag (24) and the bottom side of the fixing frame (1) are all provided with rubber rings (26). The top side of the inner bottom bag (23), the bottom side of the outer filter bag (6), the top side of the inner filter bag (5) are all provided with sealing grooves (27). The sealing grooves (27) are matched with the rubber rings (26).

7. A combination filter bag according to claim 6, characterised in that: The outer side of the inner bottom bag (23) and the inner side of the outer bottom bag (24) are both provided with support plates (28). One side of the support plate (28) is provided with a support spring (29). The two ends of the support spring (29) are respectively connected to the support plate (28).

8. A combination filter bag according to claim 7, characterised in that: The support plate (28) is provided with a through hole (30).

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