A dynamic, sealed, low-emission flue gas collection device adapted to steel plate cutting stations

Abstract

This invention relates to the technical field of industrial flue gas collection and dust removal equipment, and discloses a dynamic sealed low-emission flue gas collection device adapted to steel plate cutting stations. Before the cutting flue gas enters the main dust collector, it is first buffered, redirected, and initially settled by two sets of staggered flue gas equalization plates in the flue gas equalization box. Then, it enters the outer shell of the box through the side air inlet and is dispersed to the outside of the arrayed filter cartridge assembly under the action of the stepped guide plates. The suction fan is sealed and connected to the internal clean air channel of the filter cartridge assembly through the clean air connection pipe and the partition connecting shell, avoiding direct suction of the dust-laden chamber and the collection shell. The flow area of ​​the clean air outlet of the filter cartridge assembly at different heights gradually decreases from top to bottom, so that the upper filter cartridge has sufficient air guiding capacity and the suction of the lower ash area is restricted, thereby reducing local filter cartridge scouring, dust re-raising, fan dust ingress, and flue gas escape.

Description

Technical Field

[0001] This invention relates to the technical field of industrial flue gas collection and dust removal equipment, and in particular to a dynamic sealed low-emission flue gas collection device adapted to steel plate cutting stations. Background Technology

[0002] During plasma cutting, flame cutting, or laser cutting of steel plates, a large amount of high-temperature fumes, fine metal oxide dust, oxide scale particles, and a small amount of sparks carried by the airflow are generated in the cutting area. If these fumes are not collected in time near the cutting position, they can easily spread to the surrounding area of ​​the workstation, affecting the air environment of the workshop and causing dust to accumulate on the surfaces of cutting equipment, guide rails, electrical components, and surrounding structures. For mobile or long-stroke steel plate cutting workstations, the location of the fumes will change with the cutting head or cutting platform. Fixed air inlets are often difficult to keep close to the fumes source. Therefore, it is usually necessary to use a combination of follow-up air inlets, air ducts, and dust collection boxes to continuously extract and filter the cutting fumes.

[0003] Existing steel plate cutting fume treatment devices mostly adopt a combination of fume hood, air inlet duct and filter cartridge dust collector. The fume generated at the cutting position is sent into the dust collector, and then fine dust is intercepted by the filter cartridges. The filtered gas is discharged by the fan. Although this type of structure can achieve basic fume collection and filtration, in actual operation, the fume entering the dust collector is often at a high velocity and carries particulate matter and sparks. If the fume directly enters the cavity where the filter cartridges are located through a single air inlet, it is easy to form a local high-speed jet. This causes the filter cartridges near the air inlet to be subjected to concentrated erosion for a long time. Some filter cartridges become blocked, burned or fail before the others, and it is difficult to keep the filtration load of the filter cartridge array balanced.

[0004] Furthermore, in some existing cartridge dust collectors, the fan is located on the side or lower side of the housing. The lower cartridges and the area near the ash hopper are more susceptible to suction effects. Dust generated after cartridge cleaning or particle settling should fall into the ash hopper and collection box. However, due to excessive suction at the bottom, insufficient airflow within the housing, or unreasonable distribution of clean air discharge resistance, settled dust can be easily re-entrained and re-adhere to the cartridge surface. This results in repeated ash accumulation on the cartridges, unstable ash collection from the ash hopper, and fluctuations in negative pressure at the front end. For these reasons, existing devices, when adapted to mobile steel plate cutting stations, still suffer from uneven localized cartridge loads, ash re-spreading, and insufficient stability in the low-emission collection of cutting fumes. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the existing technology causes local scouring of the filter cartridge, dust re-emergence and smoke emission due to the direct entry of cutting flue gas into the filter cartridge cavity. To address this, we propose a dynamic sealed low-emission flue gas collection device adapted to the steel plate cutting station.

[0006] To achieve the above objectives, this application adopts the following technical solution: a dynamic sealed low-emission flue gas collection device adapted to a steel plate cutting station, comprising a main dust collector, a flue gas equalization box, and an inlet pipe. The flue gas equalization box is located on one side of the main dust collector, and the outlet end of the inlet pipe is connected to the lower end of the flue gas equalization box. The inlet end of the inlet pipe is divided into two inlets. The main dust collector includes a housing shell, and multiple sets of arrayed filter cartridge assemblies are arranged inside the housing shell. A lateral inlet is opened on the side of the housing shell adjacent to the flue gas equalization box. Two sets of flue gas equalization plates are arranged inside the flue gas equalization box, and the cross-flow outlets on the two sets of flue gas equalization plates are located on different sides.

[0007] An exhaust fan is installed on the outside of the housing. The air inlet of the exhaust fan is connected to a clean air connection pipe that extends into the housing. The clean air connection pipe is connected to a partition connection shell, which is connected to the inside of the filter cartridge assembly.

[0008] The gas outlet area of ​​the filter cartridge assemblies located at different heights gradually decreases from top to bottom.

[0009] Preferably, a stepped air guide plate is provided on the top inner side of the housing shell, and the stepped air guide plate is located inside the side air inlet.

[0010] Preferably, a collection shell is connected to the lower end of the outer shell of the box, the collection shell has a downwardly tapering bucket-shaped structure, a collection box is movably installed at the lower end of the collection shell, and a support frame is fixedly installed below the outer shell of the box and the collection shell.

[0011] Preferably, the two sets of flue gas equalization plates are spaced apart along the height direction of the flue gas equalization box, and the cross-flow outlets of the lower flue gas equalization plate and the cross-flow outlets of the upper flue gas equalization plate are respectively close to the opposite sides of the flue gas equalization box, and the flue gas equalization plates are inclined plates.

[0012] Preferably, the stepped air deflector includes multiple parallel plates arranged sequentially along the air intake direction of the lateral air intake, and the lengths of the multiple plates vary sequentially.

[0013] Preferably, multiple sets of filter cartridge fixing rings are fixedly installed on the outer side of the housing shell, and the multiple sets of filter cartridge fixing rings are arranged in a one-to-one correspondence with multiple sets of filter cartridge assemblies. The inner side of the filter cartridge fixing ring is provided with a first threaded connection groove. The filter cartridge assembly includes a filter cartridge fixing head, and the outer side of the filter cartridge fixing head is provided with a second threaded connection part that matches the first threaded connection groove.

[0014] Preferably, the filter cartridge assembly further includes a central connecting column, a first ventilated end plate, pleated filter material, a second ventilated end plate, and an inner support ring. The central connecting column is fixedly installed on the inner side of the filter cartridge fixing head. The first ventilated end plate is connected to one end of the central connecting column. The pleated filter material is disposed between the first ventilated end plate and the second ventilated end plate. The pleated filter material is disposed on the outer side of the inner support ring and forms continuous V-shaped pleats along the circumference.

[0015] Preferably, the first ventilated end plate has a plurality of first connecting holes, and the second ventilated end plate has a plurality of second connecting holes. In the filter cartridge assembly arranged from top to bottom, the total opening area of ​​the first connecting holes and the second connecting holes gradually decreases.

[0016] Preferably, the second ventilated end plate is inserted into the corresponding partition connecting shell, and a clean air confluence gap is formed between the second ventilated end plate and the partition connecting shell, and the clean air confluence gap is connected to the second connecting hole; a heat-resistant sealing ring is provided between the second ventilated end plate and the partition connecting shell.

[0017] Preferably, the upper end of the clean air connecting pipe is connected to multiple sets of clean air side fixing plates, and the clean air side fixing plates arranged face to face are connected by partitioned connecting shells, and the multiple partitioned connecting shells are interconnected through fixing pipes.

[0018] The technical effects and advantages of this invention are as follows:

[0019] In this invention, before the cutting flue gas enters the main dust collector, it is first buffered, redirected, and initially settled by two sets of staggered flue gas equalization plates inside the flue gas equalization box. Then, it is fed into the outer shell of the box through the side inlet, and the flue gas is dispersed and guided to the outside of multiple arrayed filter cartridge assemblies by the stepped guide plates located inside the side inlet. The suction fan does not directly suck up the dust-laden chamber or collection shell, but instead connects it to the internal clean air channel filtered by the filter cartridge assembly via a clean air connection pipe and a partitioned connecting shell, ensuring that the flue gas must pass through the filter cartridge assembly before... Then, as the filter cartridges enter the suction path, the flow area of ​​the clean air outlets of the filter cartridges at different heights gradually decreases from top to bottom. The upper filter cartridges obtain sufficient clean air discharge capacity, while the suction of the lower part near the ash collection area is appropriately restricted. As a result, high-temperature flue gas and particulate matter will not concentrate and directly impact local filter cartridges, the filtration load of the filter cartridge array is more balanced, the dust falling into the collection shell is less likely to be re-entrained, the risk of ash ingress into the fan and premature blockage of local filter cartridges is reduced, and the negative pressure collection at the cutting station is more stable, which helps to reduce the escape of flue gas from the cutting area. Attached Figure Description

[0020] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0021] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the overall structure of the device of the present invention. Figure 2 ;

[0023] Figure 3 This is a schematic diagram of the internal structure of the main dust collector and the flue gas equalization box of the present invention;

[0024] Figure 4 This is a schematic diagram of the internal structure of the main dust collector of the present invention;

[0025] Figure 5 This is a schematic diagram of the planar structure of the stepped guide plate of the present invention;

[0026] Figure 6 This is a schematic diagram of the filter cartridge assembly and the suction fan component of the present invention;

[0027] Figure 7 This is a schematic diagram of the internal structure of the outer shell of the box according to the present invention;

[0028] Figure 8 This is a schematic diagram of the overall structure of the filter cartridge assembly of the present invention. Figure 1 ;

[0029] Figure 9 This is a schematic diagram of the overall structure of the filter cartridge assembly of the present invention. Figure 2 ;

[0030] Figure 10 This is a schematic diagram of the overall structure of the filter cartridge assembly of the present invention. Figure 3 ;

[0031] Figure 11 This is a schematic diagram of the internal structure of the partitioned connected shell of the present invention.

[0032] Legend: 1. Main dust collector box; 11. Outer shell of the box; 111. Collection shell; 112. Collection box; 113. Support frame; 114. Stepped guide plate; 115. Side air inlet; 116. Filter cartridge fixing ring; 1161. First threaded connection groove; 12. Filter cartridge assembly; 121. Filter cartridge fixing head; 1211. Second threaded connection part; 1212. Central connecting column; 1213. First ventilated end plate; 12 14. First connecting hole; 1215. Second ventilated end plate; 1216. Second connecting hole; 122. Folded filter material; 1221. Inner support ring; 13. Suction fan; 131. Clean air connecting pipe; 132. Clean air side fixing plate; 133. Partition connecting shell; 1331. Clean air manifold gap; 134. Fixing pipe; 2. Flue gas equalization box; 21. Flue gas equalization plate; 211. Cross-flow outlet; 3. Air inlet pipe. Detailed Implementation

[0033] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0034] Reference Figures 1 to 11 As shown, this invention provides a dynamic sealed low-emission flue gas collection device adapted to a steel plate cutting station, including a main dust collector 1, a flue gas equalization box 2, and an inlet pipe 3. The main dust collector 1 is used to filter and collect the cutting flue gas entering the device. The flue gas equalization box 2 is located on one side of the main dust collector 1 and is used to buffer, deflect, and distribute the flue gas entering through the inlet pipe 3. The outlet end of the inlet pipe 3 is connected to the lower end of the flue gas equalization box 2. The inlet end of the inlet pipe 3 is divided into two inlets, which are used to approach the cutting position of the steel plate cutting station. In actual use, the two inlets can be connected to a follow-up suction port or a flexible sealed suction hood and move synchronously with the steel plate cutting station to form a local negative pressure collection area near the cutting position, reducing the emission of cutting flue gas and fine dust out of the workshop.

[0035] The main dust collector 1 includes a housing 11. The housing 11 contains a cavity for containing flue gas and installing filter components. Multiple sets of filter cartridge assemblies 12 are arranged in an array within the housing 11. In this embodiment, the filter cartridge assemblies 12 can be arranged in a four-row, three-column configuration. Each filter cartridge assembly 12 is inserted horizontally into the housing 11. A lateral air inlet 115 is provided on the side of the housing 11 adjacent to the flue gas equalization box 2. The flue gas equalization box 2 is connected to the interior of the housing 11 via the lateral air inlet 115. The lower end of the outer shell 11 of the main dust collector is connected to a collection shell 111, which has a downwardly tapering bucket-shaped structure. A collection box 112 is movably installed at the lower end of the collection shell 111. The collection box 112 can be a drawer-type structure or a push-pull type dust collection box structure, so as to clean the settled dust without disassembling the main unit. A support frame 113 is fixedly installed below the outer shell 11 and the collection shell 111. The support frame 113 is used to support the main dust collector 1 and leave space for the collection box 112 to be pulled out and cleaned.

[0036] Two sets of flue gas equalization plates 21 are fixedly installed inside the flue gas equalization box 2. The two sets of flue gas equalization plates 21 are spaced apart, and the cross-flow ports 211 on the two sets of flue gas equalization plates 21 are located on different sides. The flue gas entering from the inlet pipe 3 first enters the lower part of the flue gas equalization box 2. After being blocked by the lower flue gas equalization plate 21, the flow direction is changed. The heavier particles, oxide scale and some sparks in the flue gas collide with the flue gas equalization plate 21 under the action of inertia and settle along the inclined surface of the flue gas equalization plate 21. The flue gas then flows upward through the cross-flow ports 211. After passing through the upper flue gas equalization plate 21 for secondary buffering and dispersion, the flue gas finally enters the interior of the housing 11 through the side air inlet 115. Through this staggered flow structure, the high-speed flue gas in the inlet pipe 3 will not directly wash over the filter cartridge assembly 12, reducing the risk of local blockage and local ablation of the filter cartridge assembly 12. The flue gas can also complete a coarse particle settling before entering the main dust collector 1. The side wall of the flue gas equalization box 2 can be equipped with a detachable maintenance plate. After a period of use, the maintenance plate can be opened to clean the residue deposited near the flue gas equalization plate 21.

[0037] A stepped guide plate 114 is fixedly installed on the top inner side of the housing shell 11. The stepped guide plate 114 is located inside the side air inlet 115 and is at approximately the same height as the side air inlet 115. The stepped guide plate 114 is composed of multiple parallel plates with varying lengths. The plates are arranged in a stepped manner along the flue gas entry direction. After the flue gas enters the housing shell 11 through the side air inlet 115, it is first blocked and dispersed by the stepped guide plate 114 to prevent the flue gas from directly impacting the inner wall of the housing shell 11 away from the side air inlet 115. After being guided by the stepped guide plate 114, the flue gas diffuses downward along the inside of the housing shell 11 and gradually flows to the outer periphery of each row of filter cartridge assemblies 12. After this treatment, the flue gas entering the housing shell 11 does not concentrate on impacting a certain local area, the windward conditions of each row of filter cartridge assemblies 12 are more similar, and the filtration load is more stable.

[0038] Multiple sets of filter cartridge fixing rings 116 are fixedly installed on the outer side of the housing 11. Each filter cartridge fixing ring 116 corresponds to a filter cartridge assembly 12. The inner side of the filter cartridge fixing ring 116 is provided with a first threaded connection groove 1161, which is used to cooperate with the end of the filter cartridge assembly 12. The filter cartridge assembly 12 includes a filter cartridge fixing head 121. A second threaded connection part 1211 is provided on the outer side of the filter cartridge fixing head 121. The second threaded connection part 1211 matches the first threaded connection groove 1161. During installation, the filter cartridge assembly 12 is inserted into the corresponding filter cartridge fixing ring 116 from the outside of the housing 11. By rotating the filter cartridge fixing head 121, the second threaded connection part 1211 is connected to the first threaded connection groove 1161, thereby fixing the filter cartridge assembly 12 inside the housing 11. When replacement or maintenance is required, a single filter cartridge assembly 12 can be unscrewed in the reverse direction without disassembling the entire filter structure.

[0039] A central connecting column 1212 is fixedly installed on the inner side of the filter cartridge fixing head 121. One end of the central connecting column 1212 is connected to a first ventilated end plate 1213. The first ventilated end plate 1213 has multiple first connecting holes 1214. A pleated filter material 122 is fixedly installed on one side of the first ventilated end plate 1213. A second ventilated end plate 1215 is fixedly installed on the other end of the pleated filter material 122. The second ventilated end plate 1215 has multiple second connecting holes 1216. The pleated filter material 122 is located on the outer side of the inner support ring 1221. The pleated filter material 122 forms continuous V-shaped pleats along the circumference. Since the pleated filter material 122 is not a flat cylindrical surface, but has a large pleated unfolded area, it can provide a larger filtration area under the same box volume. When the flue gas flows through the outside of the pleated filter material 122, the dust is intercepted by the pleated filter material 122 and adheres to its outer surface. The filtered gas enters the inside of the filter cartridge assembly 12 and is then discharged through the first connecting hole 1214 and the second connecting hole 1216.

[0040] In this embodiment, the filter cartridge assemblies 12 at different heights employ different air outlet areas. Specifically, from top to bottom, the total opening area of ​​the first connecting hole 1214 on the first ventilated end plate 1213 and the second connecting hole 1216 on the second ventilated end plate 1215 of the filter cartridge assemblies 12 gradually decreases. This can also be understood as the upper row of filter cartridge assemblies 12 having a larger end plate ventilation area, the middle row of filter cartridge assemblies 12 having a moderate end plate ventilation area, and the lower row of filter cartridge assemblies 12 having a smaller end plate ventilation area. Since the suction fan 13 is located on the outer shell of the housing... The side or lower part of 11 is more susceptible to suction. At the same time, the lower part is close to the collection shell 111 and the dust collection area. If the ventilation area of ​​the lower filter cartridge assembly 12 is too large, it is easy to cause dust to be stirred up again. By making the area of ​​the connecting hole of the upper filter cartridge assembly 12 larger and the area of ​​the connecting hole of the lower filter cartridge assembly 12 smaller, the suction resistance of the filter cartridge assembly 12 at different heights can be distributed, so that the upper filter cartridge assembly 12 can obtain sufficient clean air discharge capacity, while limiting the excessive suction near the lower dust collection area and reducing the re-rolling of settled dust.

[0041] Two sets of suction fans 13 are fixedly installed on the outside of the housing 11. A clean air connection pipe 131 is fixedly installed at the air intake of the suction fan 13. The clean air connection pipe 131 extends into the inside of the housing 11 and is connected to the clean air side after filtration by the filter cartridge assembly 12. Multiple sets of clean air side fixing plates 132 are connected to the upper end of the clean air connection pipe 131. The clean air side fixing plates 132 are set against the inner wall of the housing 11. The clean air side fixing plates 132 facing each other are connected by partition connecting shells 133. The multiple partition connecting shells 133 are connected to each other through fixing pipes 134. The partition connecting shells 133 are fixedly connected to the inner wall of the housing 11. The fixing pipes 134 are used to collect the clean air in the multiple partition connecting shells 133 and introduce it into the clean air connection pipe 131.

[0042] The partition connecting shell 133 is correspondingly arranged with the filter cartridge assembly 12. The second ventilated end plate 1215 can be inserted into the corresponding partition connecting shell 133. A clean air confluence gap 1331 is formed between the second ventilated end plate 1215 and the partition connecting shell 133. The clean air confluence gap 1331 is connected to the second connecting hole 1216 for receiving the clean air filtered by the folded filter material 122. To prevent unfiltered dusty flue gas from directly entering the partition connecting shell 133, a sealing mating area is provided between the second ventilated end plate 1215 and the partition connecting shell 133. A heat-resistant sealing ring is provided between the two. When the second ventilated end plate 1215 is inserted into the partition connecting shell 133, it is squeezed by the heat-resistant sealing ring to form a seal, thus ensuring the partition... The connecting shell 133 only receives clean air exported from inside the filter cartridge assembly 12. The first ventilated end plate 1213 on one side of the filter cartridge fixing head 121 can also form a corresponding clean air confluence gap with the adjacent partition connecting shell 133, so that both ends of the filter cartridge assembly 12 can participate in the export of clean air. The connecting holes on the first ventilated end plate 1213 and the second ventilated end plate 1215 are both located on the clean air export side of the filter cartridge assembly 12. A sealing fit area is set between the first ventilated end plate 1213, the second ventilated end plate 1215 and the corresponding partition connecting shell 133, so that the dust-laden flue gas in the outer shell 11 can only pass through the folded filter material 122 first and then enter the interior of the filter cartridge assembly 12, and then enter the partition connecting shell 133 through the corresponding connecting hole.

[0043] When two sets of suction fans 13 are set, an inner cavity partition plate is provided inside the filter cartridge assembly 12. The inner cavity partition plate is set along the axial or radial direction of the filter cartridge assembly 12 to divide the clean air channel inside the filter cartridge assembly 12 into two independent sections. The two sections of clean air channel are respectively connected to the partition connecting shell 133 on the corresponding side. In this way, the two sets of suction fans 13 respectively draw air from their respective corresponding clean air channels, and there will be no cross-flow of air through the internal space of the same filter cartridge assembly 12. It is also not easy to have the problem of strong suction on one side and weakened air flow on the other side. If the actual equipment only sets one set of suction fans 13, the inner cavity partition plate can also be removed, so that the inside of the filter cartridge assembly 12 can be used as a continuous clean air channel.

[0044] During use, the fumes and fine dust generated at the steel plate cutting station are drawn into the fumes distribution box 2 through the inlet pipe 3 under the negative pressure created by the suction fan 13. Inside the fumes distribution box 2, the fumes are buffered and deflected by the fumes distribution plate 21 before entering the outer shell 11 through the side inlet 115. After entering the outer shell 11, the fumes are guided by the stepped guide plate 114 and dispersed to the outside of each filter cartridge assembly 12. Larger particles fall into the collection shell 111 under the influence of deflection, deceleration, and gravity. Fine dust is carried by the airflow to the outer surface of the folded filter material 122 and is trapped by it. The filtered gas enters the interior of the filter cartridge assembly 12, passes through the first connecting hole 1214, the second connecting hole 1216, the clean air confluence gap 1331, the partition connecting shell 133, the fixed pipe 134, and the clean air connecting pipe 131, and finally exits through the suction fan 13.

[0045] When dust accumulates on the outer surface of the folded filter material 122, the filter cartridge assembly 12 can be cleaned by stopping the machine, manual cleaning, or by using an external pulse backflushing structure. The detached dust falls into the collection shell 111 under gravity and slides into the collection box 112 along the inclined inner wall of the collection shell 111. Since the ventilation area of ​​the end plate of the lower row filter cartridge assembly 12 is smaller than that of the upper row filter cartridge assembly 12, and the suction fan 13 draws air through the clean air side structure, the settled dust in the collection shell 111 is not easily directly drawn into the suction fan 13. After the collection box 112 accumulates dust, it can be pulled out from under the support frame 113 for cleaning and then pushed back into the lower end of the collection shell 111.

[0046] This device uses a flue gas equalization box 2 to deflect and buffer the high-speed cutting flue gas. A stepped guide plate 114 prevents the flue gas from directly impacting the inner wall of the box and local filter cartridges. The filter cartridge assembly 12 arranged in an array increases the filtration area. The resistance to clean gas discharge is adjusted by changing the area of ​​the connecting holes of the filter cartridge assembly 12 at different heights. This ensures that the flue gas near the cutting station is collected in a timely manner and reduces the risk of dust return from the lower ash collection area and dust ingress into the fan. The filter cartridge assembly 12 is installed individually with a threaded design. It can be disassembled, replaced or cleaned individually according to the degree of blockage. The maintenance method is relatively straightforward and it is suitable for use in environments where the steel plate cutting station generates continuous dust and the dust particle size varies greatly.

[0047] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A dynamic, sealed, low-emission flue gas collection device adapted to a steel plate cutting station, comprising a main dust collector, a flue gas equalization box, and an inlet pipe, wherein the flue gas equalization box is disposed on one side of the main dust collector, the outlet end of the inlet pipe is connected to the lower end of the flue gas equalization box, and the inlet end of the inlet pipe is provided with two inlets, characterized in that: The main dust collector includes a housing shell, inside which are arranged multiple arrays of filter cartridge assemblies. A lateral air inlet is provided on the side of the housing shell adjacent to the flue gas equalization box. Two sets of flue gas equalization plates are provided inside the flue gas equalization box, and the cross-flow outlets on the two sets of flue gas equalization plates are located on different sides. An exhaust fan is provided on the outside of the housing shell. The air intake of the exhaust fan is connected to a clean air connection pipe that extends into the housing shell. The clean air connection pipe is connected to a partition connection shell, and the partition connection shell is connected to the inside of the filter cartridge assembly. The gas outlet area of ​​the filter cartridge assemblies located at different heights gradually decreases from top to bottom.

2. The dynamic sealed low-emission flue gas collection device adapted to steel plate cutting stations according to claim 1, characterized in that: A stepped air guide plate is provided on the top inner side of the housing shell, and the stepped air guide plate is located inside the side air inlet.

3. The dynamic sealed low-emission flue gas collection device adapted to steel plate cutting stations according to claim 1, characterized in that: A collection shell is connected to the lower end of the outer shell of the box. The collection shell has a downward-contracting bucket-shaped structure. A collection box is movably installed at the lower end of the collection shell. A support frame is fixedly installed below the outer shell of the box and the collection shell.

4. The dynamic sealed low-emission flue gas collection device adapted to steel plate cutting stations according to claim 1, characterized in that: The two sets of flue gas equalization plates are spaced apart along the height direction of the flue gas equalization box. The cross-flow outlets of the lower flue gas equalization plate and the cross-flow outlets of the upper flue gas equalization plate are respectively close to the opposite sides of the flue gas equalization box. The flue gas equalization plate is an inclined plate.

5. The dynamic sealed low-emission flue gas collection device adapted to steel plate cutting stations according to claim 2, characterized in that: The stepped air intake includes multiple parallel plates arranged sequentially along the air intake direction of the lateral air intake, and the lengths of the plates vary sequentially.

6. The dynamic sealed low-emission flue gas collection device adapted to steel plate cutting stations according to claim 1, characterized in that: Multiple sets of filter cartridge fixing rings are fixedly installed on the outer side of the housing shell. Each set of filter cartridge fixing rings corresponds to a set of filter cartridge assemblies. The inner side of the filter cartridge fixing ring is provided with a first threaded connection groove. The filter cartridge assembly includes a filter cartridge fixing head. The outer side of the filter cartridge fixing head is provided with a second threaded connection part that matches the first threaded connection groove.

7. The dynamic sealed low-emission flue gas collection device adapted to steel plate cutting stations according to claim 6, characterized in that: The filter cartridge assembly further includes a central connecting column, a first ventilated end plate, pleated filter material, a second ventilated end plate, and an inner support ring. The central connecting column is fixedly installed on the inner side of the filter cartridge fixing head. The first ventilated end plate is connected to one end of the central connecting column. The pleated filter material is disposed between the first ventilated end plate and the second ventilated end plate. The pleated filter material is disposed on the outer side of the inner support ring and forms continuous V-shaped pleats along the circumference.

8. The dynamic sealed low-emission flue gas collection device adapted to steel plate cutting stations according to claim 7, characterized in that: The first ventilated end plate has multiple first connecting holes, and the second ventilated end plate has multiple second connecting holes. In the filter cartridge assembly arranged from top to bottom, the total opening area of ​​the first connecting holes and the second connecting holes gradually decreases.

9. The dynamic sealed low-emission flue gas collection device adapted to steel plate cutting stations according to claim 7, characterized in that: The second ventilated end plate is inserted into the corresponding partition connecting shell, and a clean air flow gap is formed between the second ventilated end plate and the partition connecting shell. The clean air flow gap is connected to the second connecting hole. A heat-resistant sealing ring is provided between the second ventilated end plate and the partition connecting shell.

10. The dynamic sealed low-emission flue gas collection device adapted to steel plate cutting stations according to claim 1, characterized in that: The upper end of the clean air connection pipe is connected to multiple sets of clean air side fixing plates, and the clean air side fixing plates arranged face to face are connected by the partition connecting shells. The multiple sets of partition connecting shells are interconnected through fixing pipes.

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