A combined dust removal device

Abstract

The present invention discloses a combined dust removal device, which includes a dust collector. A bag dust removal assembly is arranged inside the dust collector. The bag dust removal assembly includes a flower plate and a dust removal bag assembly. The dust removal bag assembly includes an inner layer bag, an outer layer bag, and a combined fitting for assembling the inner layer bag and the outer layer bag. The combined fitting includes an upper fitting and a lower fitting. The upper fitting includes an inner sleeve, an inner sheath, and an outer plug used in a set. The lower fitting includes an inner ring and an outer ring. The inner ring is assembled on the outer edge of the closed bottom surface of the inner layer bag, and the outer ring is assembled on the outer edge of the closed bottom surface of the outer layer bag. The inner ring and / or the outer ring is a weight structure to tension and expand the combined bag body after the inner ring and the outer ring are assembled. The present invention can effectively improve the dust removal quality and efficiency of the dust collector and extend the service life of the bag body in the dust collector.

Description

Technical Field

[0001] The invention relates to the technical field of environmentally friendly dust removal, and in particular to a combined dust removal device based on a bag dust collector. Background Art

[0002] As a dry dust filtering device, bag dust collector is one of the dust collectors with a high usage rate at present. It can capture dry non-fibrous dust in the air during dust filtering, and is suitable for dust removal in most industries. When working, the bag dust collector passes the dust-laden air from the bottom of the bag dust collector into the ash hopper, and then enters each bag upward from the ash hopper to filter the dust. The filtered air is discharged through the upper outlet of the bag, and the filtered dust particles either fall directly into the ash hopper, or adhere to the surface of the bag and are shaken off by the reverse spray device and collected by the ash hopper.

[0003] The dust collector bag is a key component that determines the dust removal efficiency and working temperature of the bag dust collector. The cost of replacing the bag is the main maintenance cost of the bag dust collector. Therefore, the properties and service life of the bag are related to the operating status and cost of the dust collector. In the bag dust collector in the prior art, the bag is mostly a simple single-layer structure, and is mainly assembled on the surface of the bag cage during assembly, and then assembled on the flower plate through the bag cage. The bag cage is used to open the bag to ensure the filtering effect of dust. The above bag assembly structure has the following defects:

[0004] 1. After the cloth bag is assembled on the bag cage, it is easy to rub against the bag cage during use. This friction will damage the surface structure of the cloth bag and thus affect the service life of the cloth bag, especially the coated cloth bag, whose bag body will directly contact the bag cage and easily leave scratches on the cloth bag, thus making the cloth bag ineffective.

[0005] 2. The single-layer bag structure has poor performance, low filtration efficiency and is easy to wear. It is difficult to clean and maintain after wear, and will directly affect the dust removal effect of the bag dust collector and the service life of related components. Summary of the invention

[0006] The technical problem solved by the present invention is to provide a combined dust removal device, which can be used to solve the defects in the above technical background.

[0007] The technical problem solved by the present invention is achieved by adopting the following technical solutions:

[0008] A combined dust removal device comprises a frame and a dust collector arranged on the frame, wherein a bag dust removal assembly is arranged in the dust collector, and the bag dust removal assembly comprises a flower plate and a dust removal bag assembly mounted on the flower plate;

[0009] The dust bag assembly comprises a combined bag body and a combined assembly part; the combined bag body comprises an inner bag and an outer bag, both of which are cylindrical bag bodies with a closed bottom and an open top, and the inner bag and the outer bag are assembled concentrically through the combined assembly part;

[0010] The combined assembly includes an upper assembly and a lower assembly:

[0011] The upper assembly comprises an inner sleeve, an inner sheath and an outer sealing plug for use as a set; the inner sleeve is a rigid cylinder; the inner sheath is an outward-expanding trumpet body that is smaller at the bottom and larger at the top, and is formed of elastic metal; the outer sealing plug is an annular rubber plug; the outer diameter of the outer sealing plug matches the assembly hole of the flower plate, and the inner diameter matches the outer diameter of the waist position of the inner sheath, and the outer cloth bag is formed in the outer sealing plug on the top surface; the inner sleeve has an outer diameter that matches the inner diameter of the inner sheath, so that the inner sleeve can be pressed into the inner diameter of the inner sheath under the action of a downward external force and remain in a clamped and fixed state; the inner cloth bag is covered on the top surface of the inner sheath through an outer flange;

[0012] The lower assembly part includes an inner ring and an outer ring, the inner ring is assembled on the outer edge of the closed bottom surface of the inner cloth bag, and the outer ring is assembled on the outer edge of the closed bottom surface of the outer cloth bag. The inner ring and the outer ring are assembled concentrically as a whole, and an assembly gap of 8 to 30 mm is separated between the outer cloth bag and the inner cloth bag by the inner ring; the inner ring and / or the outer ring is a counterweight structure to tension and open the combined bag body after the inner ring and the outer ring are assembled.

[0013] As a further limitation, a blowing box is provided on the top of the dust collector, with the blowing direction facing the surface of the flower plate.

[0014] As a further limitation, the outer layer bag is a PTFE impregnated bag, and the base material of the bag is one of a glass fiber bag, a graphite glass fiber bag, and a Metas bag; and the inner layer bag is one of a glass fiber and synthetic fiber interwoven filter bag, a polyester needle-punched filter felt bag, a glass fiber filter material bag, and an anti-static needle-punched felt bag.

[0015] As a further limitation, the air permeability of the inner cloth bag is 1.2 to 1.5 times the air permeability of the outer cloth bag.

[0016] As a further limitation, anti-slip patterns are formed on the outer wall of the inner sleeve and / or the inner wall of the inner sheath.

[0017] As a further limitation, the inner sleeve is formed with a vertical notch on the lower side wall to improve the outward expansion performance of the inner sleeve when the inner side is stressed.

[0018] As a further limitation, the outer edge at the top of the inner sheath is turned outwards, and a rigid metal ring is wrapped around by the turned-out edge to serve as a shaping and stabilizing structure.

[0019] As a further limitation, the outer plug has an assembly step on its outer diameter that matches the assembly hole on the flower plate, and the outer plug is detachably assembled into the assembly hole of the flower plate by means of interference fitting through the assembly step.

[0020] As a further limitation, a snap ring is also provided inside the dust collector. The snap ring is fixedly assembled on the inner side wall of the cavity of the dust collector. The setting plane of the snap ring is located below the setting plane of the lower fitting. A stainless steel wire mesh is formed inside the snap ring; and a star-shaped frame is also provided on the lower fitting. A pull rope is led out from the center position of the star-shaped frame on the lower fitting. The lower fitting tensions the combined bag body through the pull rope and is connected to the stainless steel wire mesh at the lower end.

[0021] A combined dust removal device of the present invention is improved on the basis of the structure of a traditional bag dust collector, and it has the following advantages and beneficial effects:

[0022] The dust removal device replaces the traditional single-layer bag body with a double-layer bag body with different passing rates, which can effectively improve the filtration quality and efficiency of dust, and ensure the purification and emission of the dust-containing gas at the outlet.

[0023] The corresponding double-layer bag body is tensioned through the combined fitting, reducing the cage of the traditional bag dust collector structure, thereby avoiding the friction between the dust removal bag and the cage during the operation and reverse spraying of the bag dust collector, and improving the service life of the bag.

[0024] The combined fitting has better assembly performance on the flower plate structure, and can quickly and conveniently install, disassemble and maintain the dust removal bag assembly. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of the present invention.

[0026] Figure 2 is Figure 1 an enlarged schematic diagram of the bag assembly structure in

[0027] Figure 3 is Figure 2 an enlarged schematic diagram of the structure of part A in

[0028] Figure 4 is Figure 2 an enlarged schematic diagram of the structure of part B in

[0029] Among them: 1. Ash storage bin; 2. Ash discharge valve; 3. Air inlet; 4. Support; 5. Lower bin body; 6. Upper bin body; 7. Air outlet; 8. Injection box; 9. Inner sleeve; 10. Inner sheath; 11. Inner layer cloth bag; 12. Outer layer cloth bag; 13. Pulling rope; 14. Snap ring; 15. Outer plug; 16. Manhole assembly hole on the flower plate; 17. Flower plate; 18. Connection buckle; 19. Stainless steel wire mesh; 20. Rigid metal ring; 21. Star-shaped frame; 22. Outer ring; 23. Assembly screw; 24. Inner ring. Detailed implementation mode

[0030] In order to enable those skilled in the art to better understand the solution of the present invention and make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the specific drawings.

[0031] This embodiment is only a part of the embodiments of the present invention and does not represent all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0032] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and do not have to be used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not have to be limited to those steps or units clearly listed.

[0033] Refer to Figures 1 to 4 A preferred embodiment of a combined dust removal device. In this embodiment, the combined dust removal device has a single-chamber structure dust collector. The single-chamber structure dust collector includes a single dust removal chamber body, and the dust removal chamber body is structurally supported by a support 4, so that the dust removal chamber body remains stable during the working state.

[0034] The dust removal chamber body includes an upper bin body 6 and a lower bin body 5. The upper bin body 6 is a hollow cavity structure with a rectangular or circular cross-section. The top surface of the upper bin body 6 is closed, and a plurality of injection boxes facing the inside of the upper bin body 6 are uniformly formed on the closed surface. The upper bin body 6 is provided with a flower plate assembly position at the upper part of the volume cavity, and a flower plate 17 is detachably assembled through the flower plate assembly position. The surface of the flower plate 17 is uniformly formed with manhole assembly holes 16 arranged in a dot matrix, and a dust removal cloth bag assembly is assembled on each manhole assembly hole 16.

[0035] The lower bin body 5 is installed at the bottom opening position of the upper bin body 6 and is in an inverted cone structure. The lower part of the inverted cone structure of the lower bin body 5 is a hopper, and the bottom of the hopper is connected to the ash storage bin 1 through a pipeline with an ash discharge valve 2.

[0036] An air inlet 3 is formed at the upper part corresponding to the hopper beside the lower bin body 5 of the dust removal bin body, and an air outlet 7 is provided at the upper side beside the plane corresponding to the perforated plate 17 on the upper bin body 6.

[0037] In this embodiment, the dust removal cloth bag assembly includes a combined bag body and a combined fitting. The combined bag body includes an inner cloth bag 11 and an outer cloth bag 12. Both the inner cloth bag 11 and the outer cloth bag 12 are cylindrical bag bodies with a closed bottom and an open top. The inner cloth bag and the outer cloth bag are concentrically sleeved and assembled through the combined fitting. After assembly, there is an assembly gap of 15 - 30 mm between the inner cloth bag 12 and the outer cloth bag 12 (when both the inner cloth bag 12 and the outer cloth bag 12 are in a taut state). At the same time, the assembled combined bag body is detachably assembled into the perforated plate assembly hole 16 on the perforated plate 17 through the combined fitting.

[0038] The combined fitting includes an upper fitting and a lower fitting. In order to achieve the above - mentioned assembly effect, the upper fitting includes an inner sleeve 9, an inner sheath 10, and an outer plug 5. The styles of the inner sleeve 9, the inner sheath 10, and the outer plug 5 are as Figure 2 、 Figure 3 shown. The inner sleeve 9 is a galvanized steel structure cylinder, and the inside of the cylinder of the inner sleeve 9 is an air duct; the inner sheath 10 is an outward - expanding horn - shaped structure with a smaller bottom and a larger top, formed by elastic metal. Therefore, when the inner sheath 10 is pressed inside, it will undergo a certain outward - expanding deformation to the outside. The outer plug 15 is a ring - shaped rubber plug structure, and the upper part of the outer cloth bag 12 is directly formed inside the outer plug 15 and is formed as one body with the outer plug 15.

[0039] In this embodiment, in order to ensure the outward - expanding deformation performance of the inner sheath 10 after being pressed, a vertical notch is formed on the lower side wall of the inner sheath 10; at the same time, the outer - expanding edge at the top of the inner sheath 10 is turned outward, and a rigid metal ring 20 is wrapped through this turned - out edge as a shaping and stabilizing structure for the top surface of the inner sheath 10, so that the top surface of the inner sheath 10 will not deform at the bell - mouth position when pressed.

[0040] The outer diameter of the outer plug 15 matches the orifice plate assembly hole 16 on the orifice plate 17, and has an assembly step on the outer diameter that matches the orifice plate assembly hole 16. The outer plug 15 is press-fitted into the orifice plate assembly hole 16 in an interference fit manner by means of external force pressing through rubber extrusion deformation. Conversely, the outer plug 15 can also be removed from the orifice plate assembly hole 16. The inner diameter of the outer plug 15 matches the outer diameter at the waist position of the inner sheath 9, and the inner sleeve 9 has an outer diameter that matches the inner diameter of the inner sheath 10, so that the inner sleeve 9 can be pressed into the inner sheath 10 under the action of a downward external force and remain in a clamped and fixed state.

[0041] The lower assembly in the combined assembly includes an inner ring 24 and an outer ring 22. The ring cross-sections of the inner ring 24 and the outer ring 22 are both L-shaped, and the outer ring 22 can be sleeved on the outer ring surface of the inner ring 24 in a concentric sleeving manner as Figure 4 shown, and the outer ring 22 sleeved on the surface of the inner ring 24 can be connected and fixed by a countersunk screw serving as the assembly screw 23.

[0042] During the assembly of the lower assembly of this embodiment, the inner ring 24 is assembled at the folded corner position of the L-shaped ring cross-section on the bottom outer edge of the inner cloth bag 11, and the outer ring 22 is assembled at the folded corner position of the L-shaped ring cross-section on the bottom outer edge of the outer cloth bag 12. Then, the outer ring 22 is connected and assembled with the assembly screw 23 at the corresponding position of the inner ring 24; the inner ring 24 has a width on the vertical side of the L-shaped ring cross-section and a thickness on the horizontal side, so that an assembly gap of 15-30 mm left between the inner cloth bag 12 and the outer cloth bag 12 is separated by the above-mentioned width and thickness on the inner ring 24.

[0043] Both the inner ring 24 and the outer ring 22 are steel structure counterweights, so that the combined bag body can maintain a natural tension state by the gravity of the inner ring 24 and the outer ring 22 without external force.

[0044] In order to optimize the tension state of the combined bag body to ensure the use effect of the combined bag body during the dust removal operation, in this embodiment, a clamping ring 14 is also formed at the position of the annular surface corresponding to the connection of the upper bin body 6 and the lower bin body 5 on the inner side of the bin body of the dust collector. The clamping ring 14 is fixedly welded to the above-mentioned annular surface position. On the one hand, it is used to improve the connection strength and structural stability between the upper bin body 6 and the lower bin body 5. In order to further improve the above performance, a plurality of reinforcing ribs can also be uniformly arranged on the inner annular surface of the clamping ring 14. On the other hand, the clamping ring 14 can be used to assist in realizing the tensioning of the combined bag body. To realize the above tensioning function, a stainless steel wire mesh frame 19 is formed on the annular surface of the clamping ring 14. Correspondingly, a star-shaped frame 21 is arranged on the entire inner side of the outer ring 22 of the lower fitting. The star-shaped frame 21 leads out a pull rope 13 at the central position, and the lower part of the pull rope 13 is connected to the stainless steel wire mesh frame 19 through a connecting buckle 18. The pull rope 13 is kept in a tensioned state, so that the combined bag body maintains a tensioned state through the tension of the pull rope 13. The combined bag body in the tensioned state can realize the dust filtering effect of the outer cloth bag 12 and the inner cloth bag 11 in the combined bag body without setting a cage.

[0045] The cancellation of the cage structure can correspondingly reduce the frictional loss between the corresponding cloth bag structure and the cage structure in the working state.

[0046] During the assembly of the upper fitting of this embodiment, first, the inner cloth bag 11 is extended upward from the inside of the inner sheath 10, and after extension, it is turned outward to the top surface of the inner sheath 10 to wrap the top surface of the inner sheath 10, thus completing the assembly and fixation of the inner cloth bag 11 on the inner sheath 10. After the inner cloth bag 11 is fixed on the inner sheath 10, an outer plug 15 is sleeved on the inner sheath 10, and the outer plug 15 is pressed into the flower plate assembly hole 16, and then an inner sleeve 9 is inserted into the inner side of the inner sheath 10 and pressed tightly, thus completing the assembly of the upper fitting to the combined bag body.

[0047] During the assembly process of the upper fitting, since the outer cloth bag 12 is directly formed in the outer plug 15 at the upper part, the assembly stability of the outer cloth bag 12 does not need to be considered. In order to improve the assembly stability of the inner cloth bag 11, anti-slip patterns can be formed on the outer wall of the inner sleeve 9 and / or the inner wall of the inner sheath 10 to improve the assembly stability of the inner cloth bag 11 by increasing the friction force. A sewing hole can also be provided at the middle position of the inner sheath 10 to sew the inner cloth bag 11 to the inner sheath 10 at the sewing hole position to improve the assembly stability of the inner cloth bag 11.

[0048] When removing the dust removal cloth bag assembly at the position of the ceiling assembly hole 16 correspondingly, it only needs to apply an external force with a tool at the lower part of the upper assembly to push out the outer plug 15, so it also has better convenience. In this embodiment, this matching method of double-layer cloth bags can effectively improve the clean air efficiency and clean air quality, but the defect is that a certain proportion of dust will remain between the outer cloth bag 12 and the inner cloth bag 11. Therefore, an assembly gap needs to be set between the outer cloth bag 12 and the inner cloth bag 11 as the accommodation space for the above-mentioned dust. At the same time, the above-mentioned easily detachable structure of the dust removal cloth bag assembly can, on the one hand, replace the worn cloth bag after the dust removal cloth bag assembly is removed, and on the other hand, can regularly and centrally clean the dust in the interlayer between the inner cloth bag 11 and the outer cloth bag 12.

[0049] When the combined dust removal device of this embodiment is in use, a single dust removal cloth bag assembly is first assembled with the lower assembly, and then assembled with the upper assembly. By circulating the assembly of the dust removal cloth bag assembly, the assembly of the dust removal cloth bag assembly on the ceiling can be completed. When the outer cloth bag 12 in a single dust removal cloth bag assembly is worn, the inner cloth bag 11 is still effective, so it can prevent the dust-containing air from passing through the worn position and being discharged from the air outlet 7 after passing through the dust removal cloth bag assembly.

[0050] The double-layer filtration effect of the outer cloth bag 12 and the inner cloth bag 11 can effectively ensure the dust removal quality and effect of the dust removal device. In order to optimize its use performance, in this embodiment, the outer cloth bag 12 is made of PTFE-impregnated Metas cloth bag, and the inner cloth bag 11 is made of polyester needle-punched filter felt cloth bag, and the air permeability of the inner cloth bag 11 is 1.5 times that of the outer cloth bag 12.

[0051] When the combined dust removal device of this embodiment is operating, it is similar to a traditional bag filter. The dust-containing gas enters the device from the air inlet 3, passes through the combined bag body for dust removal and filtration, and then is discharged from the air outlet 7. The corresponding dust will adhere to the surface of the combined bag body (including the outer cloth bag 12 and the inner cloth bag 11) during the dust removal process. By using high-pressure gas for intermittent reverse spraying in the spray box 8, the dust adhering to the outer cloth bag 12 and part of the inner cloth bag 11 can be blown into the ash hopper and enter the ash storage bin 2 through the ash discharge valve 2, while the other part of the dust accumulated between the outer cloth bag 12 and the inner cloth bag 11 is processed by means of regular centralized cleaning.

[0052] In other embodiments, the combined dust removal device may also adopt a multi-chamber structure to increase the dust removal capacity. When adopting the multi-chamber structure, the corresponding dust collector includes a plurality of upper chamber bodies 6 arranged in parallel. The interiors of the adjacent upper chamber bodies 6 are connected, and a flower plate 17 is provided at the same height plane position. The upper chamber body 6 is provided with an air outlet 7 at the position of the upper side plate corresponding to the plane where the flower plate 17 is arranged. The top surface of the upper chamber body 6 is closed, and a plurality of blow boxes 8 facing the interior of the upper chamber body 6 are provided on the closed surface. Its overall working mode is the same as the structural style of the combined dust removal device with a single-chamber structure. An independent lower chamber body 5 is connected to the lower part of each upper chamber body 6, and an air inlet 7 is provided beside the lower chamber body 5. A dust hopper is provided below the lower chamber body 5 at the plane position of the air inlet 7.

[0053] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined dust removal device, characterized in that, It includes a frame and a dust collector arranged on the frame. A bag dust removal assembly is arranged inside the dust collector, and the bag dust removal assembly includes a perforated plate and a dust removal bag assembly assembled on the perforated plate; The dust removal bag assembly includes a combined bag body and a combined fitting; the combined bag body includes an inner layer cloth bag and an outer layer cloth bag. Both the inner layer cloth bag and the outer layer cloth bag are cylindrical bag bodies with a closed bottom and an open top. The inner layer cloth bag and the outer layer cloth bag are concentrically sleeved and assembled through the combined fitting; The combined fitting includes an upper fitting and a lower fitting: The upper fitting includes an inner sleeve, an inner sheath and an outer plug used in a set; the inner sleeve is a rigid cylinder; the inner sheath is an outwardly expanding horn body with a smaller bottom and a larger top, formed by elastic metal; the outer plug is an annular rubber plug; the outer diameter of the outer plug matches the assembly hole of the perforated plate, and the inner diameter matches the outer diameter at the waist position of the inner sheath. The outer layer cloth bag is formed inside the outer plug at the top; the inner sleeve has an outer diameter matching the inner diameter of the inner sheath, so that the inner sleeve can be pressed into the inner diameter of the inner sheath under the action of a downward external force and maintain a clamped and fixed state; the inner layer cloth bag is sleeved on the top surface of the inner sheath through the turned-up edge of the inner layer cloth bag at the top; The lower fitting includes an inner ring and an outer ring. The inner ring is assembled on the outer edge of the closed bottom of the inner layer cloth bag, and the outer ring is assembled on the outer edge of the closed bottom of the outer layer cloth bag. The inner ring and the outer ring are concentrically assembled into one body, and an assembly gap of 8 - 30 mm is separated between the outer layer cloth bag and the inner layer cloth bag through the inner ring; the inner ring and / or the outer ring is a weight structure to tension and expand the combined bag body after the inner ring and the outer ring are assembled.

2. The combined dust removal device according to claim 1, characterized in that, A blow - box with a blowing direction towards the surface of the perforated plate is arranged at the top of the dust collector.

3. The combined dust removal device according to claim 1, characterized in that The outer layer cloth bag is a PTFE - impregnated cloth bag, and the base material of the outer layer cloth bag is one of a glass fiber cloth bag, a graphite glass fiber cloth bag, and a Metamax cloth bag; while the inner layer cloth bag is one of a glass fiber and synthetic fiber interwoven filter cloth bag, a polyester needle - punched filter felt cloth bag, a glass fiber filter cloth bag, and an anti - static needle - felt cloth bag.

4. The combined dust removal device according to claim 1, characterized in that, The air permeability of the inner layer cloth bag is 1.2 - 1.5 times that of the outer layer cloth bag.

5. The combined dust removal device according to claim 1, characterized in that, Anti - slip lines are formed on the outer wall of the inner sleeve and / or the inner wall of the inner sheath.

6. The combined dust removal device according to claim 1, wherein, A vertical notch is formed on the lower side wall of the inner sheath to improve the outward expansion performance of the inner sheath under the condition of inner - side force.

7. The combined dust removal device according to claim 1, wherein The outer - expanding edge position at the top of the inner sheath is turned outwards, and a rigid metal ring is wrapped around through the turned - out edge of the inner sheath as a shaping and stabilizing structure.

8. The combined dust removal device according to claim 1, wherein The outer plug has an assembly step on the outer diameter that matches the assembly hole on the perforated plate, and the outer plug is detachably assembled in the assembly hole of the perforated plate through the interference - fit assembly method of the assembly step.

9. The combined dust removal device according to claim 1, characterized in that, A snap ring is further provided inside the dust collector. The snap ring is fixedly assembled on the inner side wall of the cavity of the dust collector. The setting plane of the snap ring is below the setting plane of the lower fitting. A stainless steel wire mesh frame is formed inside the snap ring. A star-shaped frame is further provided on the lower fitting. A pull rope is led out from the center position of the star-shaped frame of the lower fitting. The lower fitting tensions the combined bag body through the pull rope, and the lower end of the pull rope is connected to the stainless steel wire mesh frame.

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