Multi-stage tail gas treatment device and treatment method for artificial leather oven

Abstract

The application discloses a multi-stage tail gas treatment device and method for artificial leather ovens, and relates to the technical field of tail gas treatment.The device comprises a shell, which is connected with an exhaust duct and an air inlet duct on the upper and lower sides respectively; the shell is fixed with a horizontally arranged circular cylinder, and the circular cylinder is provided with a vertically arranged inner cavity; a plurality of fan-shaped filter mechanisms are arranged in the shell, and the fan-shaped filter mechanisms are rotatably installed on the shell through rotating seats, and the fan-shaped filter mechanisms are annularly distributed on the outer side of the circular cylinder, wherein two fan-shaped filter mechanisms are arranged on the upper and lower sides of the inner cavity respectively. The rotating angle of the rotating disc is driven by a driving mechanism, the fan-shaped filter mechanisms are alternately positioned, and fine adsorbing fillers are automatically transferred from the upper fan-shaped filter mechanism to the lower fan-shaped filter mechanism by gravity and shaking mechanism, so that the fine adsorbing fillers are movable, the contact between the fine adsorbing fillers and the tail gas is increased, and the adsorption effect on the tail gas is improved.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas treatment technology, specifically to a multi-stage exhaust gas treatment device and method for an artificial leather drying oven. Background Technology

[0002] Artificial leather, as an important synthetic material, is widely used in clothing, furniture, and automotive interiors. The oven drying process is a crucial step in its production, primarily involving heating to cure coatings and evaporating solvents to achieve product shaping. However, artificial leather ovens generate large amounts of high-temperature, high-humidity exhaust gases during operation. These gases contain high concentrations of volatile organic compounds (VOCs), such as dimethylformamide (DMF), benzene compounds (benzene, toluene, xylene), phthalate plasticizers (DOP), and other harmful impurities like esters and aldehyde solvents. These pollutants not only pose toxicity and carcinogenic risks but also contribute to ozone layer depletion and photochemical smog formation, seriously threatening human health and environmental safety. Therefore, the artificial leather industry must implement efficient purification treatment for oven exhaust gases to meet national emission standards.

[0003] In existing technologies, exhaust gas treatment for artificial leather drying ovens mainly employs single or combined methods such as activated carbon adsorption, catalytic combustion, or absorption scrubbing. Among these, activated carbon adsorption is widely used due to its high efficiency and low cost, capturing VOC molecules through physical adsorption to achieve preliminary purification. However, existing activated carbon adsorption devices suffer from fixed structures, difficulty in achieving automatic circulation and online cleaning of the packing material, and long-term use can easily lead to channel blockage, increased pressure loss, and affect the continuity of exhaust gas treatment.

[0004] The aforementioned problems prevent existing exhaust gas treatment devices from meeting the environmental requirements of high efficiency, energy saving, and continuous production in practical industrial applications. Therefore, there is an urgent need to develop an innovative, multi-stage synergistic exhaust gas treatment device that can achieve dynamic circulation and online cleaning of the adsorption packing material, improve VOCs removal rate while reducing operation and maintenance costs, and ensure the continuity and stability of the treatment process. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-stage exhaust gas treatment device and method for artificial leather drying ovens, which solves the problems of existing activated carbon adsorption devices having a fixed structure and difficulty in achieving automatic circulation and online cleaning of the packing material.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution: The present invention includes a housing, and an exhaust pipe and an intake pipe are respectively connected to the upper and lower sides of the housing; The shell is fixed with a horizontally arranged circular cylinder, and the circular cylinder has a vertically arranged inner cavity. The housing contains multiple sector-shaped filter mechanisms, which are rotatably mounted on the housing via rotating seats. These sector-shaped filter mechanisms are arranged in a ring around the outer side of the cylindrical shell, with two of them located on the upper and lower sides of the inner cavity, respectively. The intake pipe, the lower fan-shaped filter mechanism, the inner cavity, the upper fan-shaped filter mechanism, and the exhaust pipe are located on the same vertical line to form a vertically penetrating exhaust gas passage. The rotating seat is driven to rotate around the cylindrical cylinder by a drive mechanism, thereby achieving the alternating positioning of the fan-shaped filter mechanism.

[0007] Preferably, the rotating seat includes a turntable rotatably mounted on the side wall of the housing, and a plurality of annularly distributed side plates are fixed on one side of the turntable, with a single fan-shaped filter mechanism being detached and installed in the gap between two adjacent side plates.

[0008] Preferably, the drive mechanism includes a first motor fixed to the outer wall of the housing, a gear fixed to the output end of the first motor, and an external gear ring fixed to the outer end of the turntable, the external gear ring meshing with the gear.

[0009] Preferably, the fan-shaped filter mechanism includes a housing, an outer arc filter screen is provided on the outer circular surface of the housing, and two inner arc filter screens that can be flipped into the housing are provided on the inner circular surface. An isolation filter screen is fixed inside the housing, and the isolation filter screen divides the housing into an outer chamber and an inner chamber. The outer chamber and the inner chamber are respectively filled with coarse adsorption filler and fine adsorption filler.

[0010] Preferably, the end of the inner arc filter is rotatably connected to the housing via a rotating shaft, and the rotating shaft is fitted with a torsion spring; a protrusion is fixed to the side wall of the housing to limit the flipping angle of the inner arc filter.

[0011] Preferably, it also includes a switching mechanism disposed on the cylindrical tube, the switching mechanism including two crossbars and a power component for driving the two crossbars to move vertically, and a bracket is fixed on the crossbars; When the power component is in operation, the bracket opens the two inner arc filter screens, driving the fine adsorption filler to fall from the inner chamber of the upper fan-shaped filter mechanism and disperse into the inner chamber of the lower fan-shaped filter mechanism.

[0012] Preferably, there are two power components, which are respectively disposed at both ends of the cylindrical tube. Each power component includes a bidirectional lead screw that is rotatably mounted on the side wall of the cylindrical tube via a mounting plate. A second motor that drives the bidirectional lead screw to rotate is fixed on one of the mounting plates. Two threaded seats are connected to the bidirectional lead screw, and the two threaded seats are respectively fixedly connected to two crossbars. An elongated through hole is opened at the end of the cylindrical tube, and the elongated through hole is filled with rubber blocks to seal the displacement gap of the crossbars.

[0013] Preferably, two diversion nets are fixed on the upper crossbar to disperse the falling fine adsorbent filler, and the two diversion nets are arranged at an angle.

[0014] Preferably, the inner ends of the intake pipe and the exhaust pipe are provided with strip-shaped airbags, which are expanded and contracted by an air pump to seal the gaps between the intake pipe and the fan-shaped filter mechanism, and between the exhaust pipe and the fan-shaped filter mechanism.

[0015] This invention also proposes a treatment method for a multi-stage exhaust gas treatment device for artificial leather drying ovens, comprising the following steps: Step 1: Position the two corresponding sector-shaped filter mechanisms on the upper and lower sides of the inner cavity using the drive mechanism, and expand the strip-shaped airbag using an air pump to seal the gap with the sector-shaped filter mechanism; Step 2: The inner arc filter screen in the upper and lower fan-shaped filter mechanisms is opened by the switching mechanism, and the fine adsorption filler falls from the inner chamber of the upper fan-shaped filter mechanism and disperses into the inner chamber of the lower fan-shaped filter mechanism. Step 3: The exhaust gas is introduced from the intake pipe and undergoes coarse adsorption by the coarse adsorption packing in the outer chamber of the lower fan-shaped filter mechanism. When it passes through the inner chamber, it undergoes secondary adsorption and purification by the falling and dispersed fine adsorption packing. Then it undergoes tertiary adsorption and purification by the outer chamber of the upper fan-shaped filter mechanism and is finally discharged through the exhaust pipe. Step 4: Once the fine adsorption filler in the upper fan-shaped filter mechanism has been dispersed, the strip-shaped airbag is contracted, and the turntable is driven to rotate by the drive mechanism, switching the two lower fan-shaped filter mechanisms to move to the upper and lower sides of the inner cavity.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The drive mechanism drives the turntable to rotate, which in turn drives the fan-shaped filter mechanism to change positions. Gravity and shaking mechanism are used to automatically transfer the fine adsorption packing from the upper fan-shaped filter mechanism to the lower fan-shaped filter mechanism, making the fine adsorption packing movable, increasing the contact between it and the exhaust gas, and improving the adsorption effect of the exhaust gas.

[0017] 2. The flipping and shaking of the inner arc filter screen, combined with the uniform dispersion function of the diversion net, achieves dynamic loosening of the fine adsorption packing, making the fine adsorption packing in a dynamic flow state. The contact with impurities in the exhaust gas is no longer limited to the static bed, but forms a multi-dimensional diffusion interface, which significantly increases the contact area, thereby strengthening van der Waals forces and capillary adsorption, improving VOCs removal efficiency, and additionally capturing residual pollutants during the transfer process, achieving efficient and continuous purification, which is far superior to the saturation limitations of traditional fixed adsorption devices.

[0018] 3. The combination of coarse adsorption in the outer chamber and fine adsorption in the inner chamber, along with additional adsorption of exhaust gas impurities during the transfer process, achieves a VOCs removal rate of 92%-98%, which is superior to the 70%-80% of existing single adsorption devices and effectively meets the GB 37822-2019 emission standard.

[0019] 4. The strip-shaped airbag expansion seal and slide rail quick disassembly design ensure no exhaust gas leakage (leakage rate <0.01%), the maintenance window facilitates online replacement, reduces overall operation and maintenance costs, and is suitable for high humidity and multi-component artificial leather exhaust gas environments. Attached Figure Description

[0020] Figure 1 This is a first-view three-dimensional structural diagram of the present invention; Figure 2 This is a second-view three-dimensional structural diagram of the present invention; Figure 3 This is a schematic diagram of the front cross-sectional structure of the present invention; Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 for Figure 3 Enlarged structural diagram at point B; Figure 6 A three-dimensional structural diagram of multiple sector-shaped filter mechanisms; Figure 7 A half-sectional schematic diagram of a single sector-shaped filter mechanism; Figure 8 This is a three-dimensional structural diagram of the switching mechanism.

[0021] The numbers in the image represent: 11-Shell; 12-Intake pipe; 13-Exhaust pipe; 14-Second maintenance window; 15-First maintenance window; 16-Strip-shaped airbag; 21-Turntable; 22-Side plate; 23-Slide groove; 24-Slide rail; 3-Fan-shaped filter mechanism; 31-Outer arc filter; 32-Isolation filter; 33-Inner arc filter; 34-Outer chamber; 35-Inner chamber; 36-Box body; 41-Cylindrical cylinder; 42-Inner cavity; 43-Port; 44-Outer gear ring; 45-First motor; 46-Gear; 5-Switch mechanism; 51-Crossbar; 52-Bracket; 53-Second motor; 54-Double-acting lead screw; 55-Threaded seat; 6-Diverter net. Detailed Implementation

[0022] The above-mentioned and other technical features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.

[0023] This embodiment provides a technical solution: a multi-stage exhaust gas treatment device for an artificial leather drying oven, such as... Figure 1-8As shown, the device includes a housing 1 and multiple fan-shaped filter mechanisms 3 and a switching mechanism 5 integrated into the housing 1. The upper and lower sides of the housing 1 have an exhaust pipe 12 and an intake pipe 11, respectively. The exhaust pipe 12 is connected to the exhaust gas pipe of the artificial leather drying oven, and the intake pipe 11 is connected to the relevant equipment of the next process (such as a subsequent catalytic combustion unit or exhaust chimney), so that a vertical through exhaust gas passage is formed inside the housing 1. When the exhaust gas passes through the inside of the housing 1, the corresponding two vertical fan-shaped filter mechanisms 3 filter and purify the exhaust gas of the artificial leather drying oven.

[0024] Multiple fan-shaped filter mechanisms 3 are rotatably mounted inside the housing 1 via a rotating seat. The rotating seat includes a turntable 21 rotatably mounted on one side wall of the housing 1. Multiple annularly distributed side plates 22 are fixed on one side of the turntable 21, and a single fan-shaped filter mechanism 3 is detached and installed in the gap between two adjacent side plates 22. The turntable 21 is driven to rotate by a drive mechanism.

[0025] The drive mechanism includes a first motor 45 fixed to the outer wall of the housing 1. A gear 46 is fixed to the output end of the first motor 45, and an outer gear ring 44 is fixed to the outer end of the turntable 21. The outer gear ring 44 is meshed with the gear 46.

[0026] A horizontally arranged circular cylinder 41 is fixed inside the housing 1, and multiple fan-shaped filter mechanisms 3 are arranged in a ring around the outside of the circular cylinder 41. The multiple fan-shaped filter mechanisms 3 are arranged to rotate around the outside of the circular cylinder 41. When the first motor 45 is running, the turntable 21 is driven to rotate through the cooperation of the gear 46 and the external gear ring 44, thereby driving the multiple fan-shaped filter mechanisms 3 to rotate around the circular cylinder 41.

[0027] It should be noted that one end of the cylindrical tube 41 near the outer gear ring 44 is fixedly connected to the outer wall of the housing 1 through a connecting bracket, and the other end of the cylindrical tube 41 is directly fixed to one side wall of the housing 1 with bolts, so that the outer gear ring 44 of the drive mechanism can be installed on the outside of the turntable 21 without interference.

[0028] The housing 1 has a vertical channel inside, which includes an inner cavity 42 inside the cylindrical tube 41. The upper and lower sides of the inner cavity 42 are connected by openings 43. During operation, a drive mechanism drives multiple fan-shaped filter mechanisms 3 to rotate, so that two symmetrical fan-shaped filter mechanisms 3 are vertically arranged. The inner sides of these two fan-shaped filter mechanisms 3 correspond vertically to the two openings 43, and the outer sides correspond vertically to the air inlet pipe 11 and the exhaust pipe 12, respectively. That is, the air inlet pipe 11, the lower fan-shaped filter mechanism 3, the vertical channel, the upper fan-shaped filter mechanism 3, and the exhaust pipe 12 are all located on the same vertical line. The exhaust gas entering the artificial leather oven through the air inlet pipe 11 will be filtered and purified sequentially by the two fan-shaped filter mechanisms 3. Figure 3As indicated by the middle arrow.

[0029] In one embodiment, the fan-shaped filter mechanism 3 includes a fan-shaped housing 36. An outer arc filter 31 is provided on the outer circular surface of the housing 36, and two inner arc filters 33 that can be flipped into the housing 36 are provided on the inner circular surface. When the two inner arc filters 33 are combined, they can close the housing 36. An isolation filter 32 is fixed inside the housing 36. The isolation filter 32 divides the chamber of the housing 36 into an outer chamber 34 and an inner chamber 35. The outer chamber 34 and the inner chamber 35 are respectively filled with coarse adsorption filler and fine adsorption filler.

[0030] Furthermore, the outer end of the inner arc filter 33 is rotatably connected to the side wall of the housing 36 via a pivot, and a torsion spring is sleeved on the pivot to drive the inner arc filter 33 to flip toward the inner cavity 35. A protrusion (pivot, torsion spring and protrusion are not shown) is fixed to the side wall of the housing 36 to limit the maximum angle of the inner arc filter 33 to flip toward the inner cavity 35. At this angle, the two inner arc filters 33 are fitted together on the side that is close to each other, which can prevent the leakage of fine adsorption filler.

[0031] It should be noted that the mesh size of the outer arc filter 31 is greater than that of the inner arc filter 33 and the isolation filter 32. This is to ensure that the coarse adsorption packing cannot pass through the outer arc filter 31 and the isolation filter 32, and the fine adsorption packing cannot pass through the isolation filter 32 and the inner arc filter 33. However, the exhaust gas from the artificial leather drying oven can pass through the outer arc filter 31, the isolation filter 32, and the inner arc filter 33. The coarse adsorption packing consists of activated carbon particles or zeolite particles with a larger diameter, while the fine adsorption packing consists of activated carbon particles or zeolite particles with a smaller diameter. Two fan-shaped filter mechanisms 3 symmetrically arranged along the center line of the circular cylinder 41 form a group. For example, in this embodiment, the fan-shaped filter mechanisms 3 are divided into three groups, and the amount of fine adsorption packing in each group can only fill one inner chamber 35. The fine adsorption packing in the upper fan-shaped filter mechanism 3 gradually falls into the inner chamber 35 of the lower fan-shaped filter mechanism 3.

[0032] The switching mechanism 5 is mounted on the cylindrical cylinder 41. It is used to open the inner arc filter screens 33 of the two fan-shaped filter mechanisms 3 located above and below, so as to discharge the fine adsorption filler of the upper fan-shaped filter mechanism 3 and drop it through the vertical channel into the inner chamber 35 of the lower fan-shaped filter mechanism 3. During the process of the fine adsorption filler falling, the fine adsorption filler can more fully absorb the impurities in the exhaust gas of the artificial leather oven, thereby improving the filtration of the exhaust gas of the artificial leather oven.

[0033] Specifically, the switching mechanism 5 includes two horizontal bars 51 arranged vertically, and at least two supports 52 are fixed on the two horizontal bars 51. The supports 52 can preferably be V-shaped structures, and the two ends of the supports 52 face the two inner arc filters 33. Power components that drive the two horizontal bars 51 to move vertically are provided at both ends of the cylindrical cylinder 41. The power components are used to drive the two horizontal bars 51 to move away from each other or closer to each other. When the two horizontal bars 51 are driven away from each other by the power components, the supports 52 on the two horizontal bars 51 contact the corresponding two inner arc filters 33 respectively, and the two inner arc filters 33 flip into the inner cavity 35, and drive the torsion spring to deform and store force, so that there is a gap between the two inner arc filters 33. The fine adsorption filler in the upper fan-shaped filter mechanism 3 will fall through the gap, and after passing through the vertical channel, it will fall into the inner cavity 35 of the lower fan-shaped filter mechanism 3 for collection.

[0034] Two elongated through holes are provided at both ends of the cylindrical tube 41, one above the other, for the horizontal bar 51 to pass through, providing space for the horizontal bar 51 to move vertically. In order to prevent exhaust gas from overflowing, a rubber block 56 is filled in the elongated through hole, and the horizontal bar 51 passes through the rubber block 56. The rubber block 56 has a certain property of being compressed or stretched. When the horizontal bar 51 moves vertically, the rubber block 56 can be compressed or stretched by itself to seal the elongated through hole.

[0035] Furthermore, the power component includes a bidirectional lead screw 54 rotatably mounted on the side wall of the cylindrical cylinder 41 via a mounting plate, and a second motor 53 that drives the bidirectional lead screw 54 to rotate is fixed on one of the mounting plates. Two threaded seats 55 are threadedly connected to the bidirectional lead screw 54, and the two threaded seats 55 are respectively fixedly connected to two crossbars 51. When the second motor 53 is running, it can drive the two crossbars 51 to move vertically, bringing them closer together or further apart.

[0036] Two vertically symmetrical diversion nets 6 are fixed on the upper horizontal bar 51. The two diversion nets 6 are inclined. When the fine adsorption filler falls down, the fine adsorption filler can be dispersed by the two diversion nets 6, so that it is evenly dispersed in the vertical channel.

[0037] In use, the reciprocating forward and reverse operation of the second motor 53 causes the two horizontal bars 51 to reciprocate vertically, thereby driving the two inner arc filter screens 33 to shake, promoting the discharge of fine adsorption packing material in the upper fan-shaped filter mechanism 3 and the entry of fine adsorption packing material into the lower inner chamber 35.

[0038] The fan-shaped filter mechanism 3 is installed between the two side plates 22 via a groove 23 formed in the side plate 22 and a slide rail 24 fixed to the outer wall of the housing 36. The groove 23 can slide into the slide rail 24 to position the fan-shaped filter mechanism 3. The turntable 21 is bolted to the side wall of the housing 36 to fix the fan-shaped filter mechanism 3 to the turntable 21. A first maintenance window 14 is provided on the corresponding side of the housing 1 for removing the bolts fixing the housing 36 to facilitate the replacement of the fan-shaped filter mechanism 3. A removable second maintenance window 13 is provided on the other side of the housing 1 for replacing the fan-shaped filter mechanism 3.

[0039] To ensure the airtightness between the intake pipe 11 and the fan-shaped filter mechanism 3, and between the exhaust pipe 12 and the fan-shaped filter mechanism 3, a strip-shaped airbag 15 is provided at the inner end of both the intake pipe 11 and the exhaust pipe 12. The strip-shaped airbag 15 is expanded or contracted by an external air pump. When compressed air is injected into the strip-shaped airbag 15 by the air pump, the strip-shaped airbag 15 expands and contacts the outer side of the fan-shaped filter mechanism 3 to seal the gap between the intake pipe 11 and the fan-shaped filter mechanism 3, and between the exhaust pipe 12 and the fan-shaped filter mechanism 3, thus preventing exhaust gas leakage. Conversely, when the air in the strip-shaped airbag 15 is discharged, it contracts and does not contact the outer surface of the fan-shaped filter mechanism 3, allowing the fan-shaped filter mechanism 3 to rotate normally.

[0040] In use, the positions of multiple fan-shaped filter mechanisms 3 are adjusted by the drive mechanism, with two of them vertically aligned, located above and below the vertical channel respectively. The upper inner chamber 35 is filled with fine adsorption filler, while the lower inner chamber 35 is empty. Compressed air is injected into the strip-shaped airbag 15 to expand it and improve the sealing. Subsequently, the exhaust gas from the artificial leather drying oven is discharged into this device. The exhaust gas from the artificial leather drying oven first passes through the outer chamber 34 and inner chamber 35 of the lower fan-shaped filter mechanism 3, the vertical channel, and the inner chamber 35 and outer chamber 34 of the upper fan-shaped filter mechanism 3. Finally, the contents are discharged through the exhaust pipe 12. The two inner arc filters 33 of the two fan-shaped filter mechanisms 3 are opened by the switching mechanism 5, causing the fine adsorption filler in the upper inner chamber 35 to fall out. Through the screening and diversion of the diversion net 6, the fine adsorption filler fills the vertical channel and finally falls into the lower inner chamber 35. When most of the fine adsorption filler in the upper inner chamber 35 has been discharged into the lower inner chamber 35, the driving mechanism can drive multiple fan-shaped filter mechanisms 3 to rotate at a certain angle, so that the next fan-shaped filter mechanism 3 is located in the corresponding position of the vertical channel, and so on.

[0041] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A multi-stage exhaust gas treatment device for an artificial leather drying oven, characterized in that, Includes a housing (1), with an exhaust pipe (12) and an intake pipe (11) respectively connected to the upper and lower sides of the housing (1). The housing (1) is fixed with a horizontally arranged circular cylinder (41), and the circular cylinder (41) has a vertically arranged inner cavity (42). The housing (1) is provided with a plurality of fan-shaped filter mechanisms (3). The plurality of fan-shaped filter mechanisms (3) are rotatably mounted on the housing (1) via a rotating seat, and the plurality of fan-shaped filter mechanisms (3) are arranged in a ring on the outside of the circular cylinder (41), wherein two of the fan-shaped filter mechanisms (3) are located on the upper and lower sides of the inner cavity (42) respectively. The intake pipe (11), the lower fan-shaped filter mechanism (3), the inner cavity (42), the upper fan-shaped filter mechanism (3) and the exhaust pipe (12) are located on the same vertical line to form a vertical through exhaust gas passage; The rotating seat is driven to rotate around the cylindrical cylinder (41) by a drive mechanism, thereby realizing the alternating positioning of the fan-shaped filter mechanism (3); The fan-shaped filter mechanism (3) includes a housing (36), an outer arc filter (31) is provided on the outer circular surface of the housing (36), and two inner arc filters (33) that can be flipped into the housing (36) are provided on the inner circular surface. An isolation filter (32) is fixed inside the housing (36), and the isolation filter (32) divides the housing (36) into an outer chamber (34) and an inner chamber (35). The outer chamber (34) and the inner chamber (35) are respectively filled with coarse adsorption filler and fine adsorption filler. The end of the inner arc filter (33) is rotatably connected to the housing (36) via a rotating shaft, and the rotating shaft is fitted with a torsion spring; the side wall of the housing (36) is fixed with a protrusion to limit the flipping angle of the inner arc filter (33); It also includes a switch mechanism (5) disposed on the cylindrical tube (41), the switch mechanism (5) including two crossbars (51) and a power component that drives the two crossbars (51) to move vertically, and a bracket (52) is fixed on the crossbars (51). When the power component is running, the bracket (52) opens the two inner arc filter screens (33), driving the fine adsorption filler to fall from the inner chamber (35) of the upper fan-shaped filter mechanism (3) and disperse into the inner chamber (35) of the lower fan-shaped filter mechanism (3); The power components are two and are respectively located at both ends of the cylindrical tube (41). The power components include a bidirectional lead screw (54) that is rotatably mounted on the side wall of the cylindrical tube (41) via a mounting plate. A second motor (53) that drives the bidirectional lead screw (54) to rotate is fixed on one of the mounting plates. Two threaded seats (55) are connected to the bidirectional lead screw (54). The two threaded seats (55) are respectively fixedly connected to two crossbars (51). The end of the cylindrical tube (41) is provided with a long waist through hole. The long waist through hole is filled with rubber blocks (56) to seal the displacement gap of the crossbars (51).

2. The multi-stage exhaust gas treatment device for artificial leather drying oven according to claim 1, characterized in that, The rotating seat includes a turntable (21) rotatably mounted on the side wall of the housing (1). A plurality of annularly distributed side plates (22) are fixed on one side of the turntable (21). A single fan-shaped filter mechanism (3) is detached and installed in the gap between two adjacent side plates (22).

3. The multi-stage exhaust gas treatment device for artificial leather drying oven according to claim 2, characterized in that, The drive mechanism includes a first motor (45) fixed to the outer wall of the housing (1), a gear (46) fixed to the output end of the first motor (45), and an outer gear ring (44) fixed to the outer end of the turntable (21), the outer gear ring (44) meshing with the gear (46).

4. The multi-stage exhaust gas treatment device for artificial leather drying oven according to claim 1, characterized in that, Two diversion nets (6) are fixed on the upper crossbar (51) to disperse the falling fine adsorption filler, and the two diversion nets (6) are set at an angle.

5. The multi-stage exhaust gas treatment device for artificial leather drying oven according to claim 1, characterized in that, The inner ends of the air intake pipe (11) and the exhaust pipe (12) are provided with strip-shaped airbags (15). The strip-shaped airbags (15) are expanded and contracted by an air pump to seal the gaps between the air intake pipe (11) and the fan-shaped filter mechanism (3) and between the exhaust pipe (12) and the fan-shaped filter mechanism (3).

6. A treatment method for the multi-stage exhaust gas treatment device for artificial leather drying ovens according to any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Position the two corresponding fan-shaped filter mechanisms (3) on the upper and lower sides of the inner cavity (42) by the drive mechanism, and expand the strip-shaped air bag (15) by the air pump to seal the gap with the fan-shaped filter mechanism (3); Step 2: The inner arc filter screen (33) in the upper and lower fan-shaped filter mechanism (3) is opened by the switching mechanism (5), and the fine adsorption filler falls from the inner chamber (35) of the upper fan-shaped filter mechanism (3) and disperses into the inner chamber (35) of the lower fan-shaped filter mechanism (3). Step 3: The exhaust gas is introduced from the intake pipe (11), and is coarsely adsorbed by the coarse adsorption packing in the outer chamber (34) of the lower fan-shaped filter mechanism (3). When it passes through the inner chamber (42), it is adsorbed and purified a second time by the fine adsorption packing that falls and disperses. Then it is adsorbed and purified a third time by the outer chamber (34) of the upper fan-shaped filter mechanism (3), and finally discharged through the exhaust pipe (12). Step 4: When the fine adsorption filler in the upper fan-shaped filter mechanism (3) is dispersed, shrink the strip-shaped air bag (15), drive the turntable (21) to rotate through the drive mechanism, and switch the two lower fan-shaped filter mechanisms (3) to move to the upper and lower sides of the inner cavity (42).

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