Air purification and adsorption device for a gravure printing machine

Abstract

The application discloses an air purification and adsorption device for a gravure printing machine, belongs to the technical field of air purification, and is provided with a pre-filtering mechanism, two combined cavities cooperating with a front filter plate are arranged in a second movable frame, the front filter plate slides into the second movable frame while the two combined cavities slide to the front filter plate, and a shell is formed on the surface of the front filter plate in cooperation, the shell formed on the front filter plate realizes the collection of oil stains and particulate matters intercepted on the front filter plate, and the purpose of preventing secondary pollution is achieved.

Description

Technical Field

[0001] This invention relates to the field of air purification technology, and more particularly to an air purification adsorption device for gravure printing machines. Background Technology

[0002] An air purification and adsorption device for a gravure printing machine is an industrial equipment for the efficient purification and organic matter recovery of waste gas generated during the gravure printing process. It mainly consists of four core modules: waste gas treatment tank, activated carbon filter plate, inorganic filtration device, and organic desorption device. The waste gas treatment tank serves as the main container, with porous activated carbon material inside. It captures organic pollutants (such as benzene and xylene volatilized from solvent-based inks) in the waste gas through physical adsorption. An inorganic filtration device is built into the waste gas treatment tank to filter inorganic particulate matter (such as dust and fiber fragments) in the waste gas. An organic desorption device is installed on the outside of the waste gas treatment tank. By heating the desorbent (such as hot air or steam) to react with the activated carbon, the adsorbed organic molecules are released from the pores, realizing the regeneration of activated carbon and the recovery of organic matter. Inorganic filtration devices are typically used as pre-filtration equipment to remove impurities such as particulate matter, oil mist, moisture, and high-boiling-point substances from exhaust gases. By removing most non-target pollutants, the load on activated carbon is reduced, allowing it to focus more on adsorbing VOCs, thereby improving the system removal rate, protecting the adsorption performance of activated carbon, and extending its service life. The filter plate, a core component of the pretreatment system, is prone to leakage during the replacement of oil and particulate matter. The leaked oil volatilizes into gaseous organic matter, which is adsorbed on the surface of particulate matter to form organic particulate matter, which is transformed into more toxic secondary pollutants, causing a complex hazard to the workshop environment. Summary of the Invention

[0003] The purpose of this invention is to address the problem that the filter plate, a core component of the pretreatment system, is prone to leakage of intercepted oil and particulate matter during replacement. The leaked oil volatilizes into gaseous organic matter, which is adsorbed onto the surface of particulate matter to form organic particulate matter, transforming into more toxic secondary pollutants and causing complex hazards to the workshop environment. Therefore, this invention proposes an air purification adsorption device for gravure printing machines.

[0004] To achieve the above objectives, the present invention employs the following technology: an air purification adsorption device for a gravure printing machine. The device includes a desorption unit, which includes a desorption chamber and a fan for drawing in exhaust gas in the middle of the desorption chamber. A main filter plate for filtering exhaust gas is provided at the top of the desorption chamber. A pre-filtration mechanism is provided inside the desorption chamber. The pre-filtration mechanism includes several first fixed frames and an air duct provided inside the desorption chamber. A first movable frame is rotatably mounted on the first fixed frame, and a pre-filter plate is installed in the middle of the first movable frame. When the first movable frame rotates to be horizontal with the air duct, it closes the gap between the first fixed frame and the air duct, so that the exhaust gas flows through the pre-filter plate for pre-filtration. And, a second fixed frame is provided in the desorption chamber, and a second movable frame is provided on the second fixed frame to rotate synchronously with the first movable frame but in the opposite direction of rotation. When the first movable frame and the second movable frame rotate to the horizontal state, they are connected to form a channel, and the pre-filter plate slides along the channel into the second movable frame; The second movable frame is provided with two combined cavities that cooperate with the pre-filter plate. As the pre-filter plate slides into the second movable frame, the two combined cavities slide towards the pre-filter plate and cooperate to form a shell sleeved on the surface of the pre-filter plate.

[0005] As a further description of the air purification adsorption device for a gravure printing press described above: The bottom of the desorption chamber is provided with a replacement hole. When the second movable frame drives the pre-filter plate to rotate in the opposite direction to be horizontal with the air duct, the end of the second movable frame is connected to the replacement hole, and the pre-filter plate is inserted into or removed from the desorption chamber through the replacement hole.

[0006] As a further description of the air purification adsorption device for a gravure printing press described above: The pre-filter plate slides on the first movable frame via a movable mechanism. The movable mechanism includes mounting chambers on both sides of the first movable frame, and a lower frame body is slidably embedded between the two mounting chambers. The lower frame is slidably embedded in the track opened in the side wall of the installation chamber via movable parts on both sides. The length of the track in the installation chamber is the moving distance of the lower frame.

[0007] As a further description of the air purification adsorption device for a gravure printing press described above: The lower frame is provided with an upper frame, and an installation platform is slidably provided on the upper frame. The pre-filter is fixedly installed in the installation platform. The installation platform closes the through hole reserved for the insertion of the pre-filter after the two combined cavities are combined, forming a completely closed shell. The upper frame is provided with a first positioning groove, and the installation platform is provided with a second positioning component that cooperates with the first positioning groove.

[0008] As a further description of the air purification adsorption device for a gravure printing press described above: The movable mechanism also includes a longitudinal slide rail mounted on the second movable frame. Two slide tables are slidably embedded in the longitudinal slide rail. Mounting frames are mounted on the slide tables, and the mounting frames are provided with second positioning grooves that engage with the first positioning element mounted on the side wall of the combined cavity.

[0009] As a further description of the air purification adsorption device for a gravure printing press described above: Both slides have open guide grooves on their surfaces, and the lower frame is provided with guide members that cooperate with the two guide grooves respectively. The guide members cooperate with the guide grooves to push the two slides to move in opposite directions, and the two combined cavities move synchronously.

[0010] As a further description of the air purification adsorption device for a gravure printing press described above: The two combined cavities are connected by a locking mechanism. The locking mechanism includes a first mounting platform set on the mounting platform. A rotating shaft is rotatably set on the first mounting platform, and two rotating parts are set on the rotating shaft. The rotating parts are provided with fitting grooves. The two combined cavities are provided with grooves that mate with the first mounting platform, and the grooves are provided with fitting parts that fit into the fitting slots.

[0011] As a further description of the air purification adsorption device for a gravure printing press described above: As the pre-filter plate and the two combined cavities move through the replacement hole and toward the installation platform, the rotating mechanism drives the rotating shaft to rotate, causing the rotating component to rotate and disengage from the fitting part, thus releasing the connection between the two combined cavities.

[0012] As a further description of the air purification adsorption device for a gravure printing press described above: The rotating mechanism includes a second mounting platform disposed on the lower frame, the second mounting platform having a guide hole, and the inner wall of the guide hole having teeth; The bottom of the first mounting platform is rotatably equipped with a connecting shaft that is connected to a rotating shaft, and a gear that meshes with teeth is provided on the connecting shaft. One of the above technical solutions has the following advantages or beneficial effects: 1. Through the pre-filtration mechanism, the second movable frame is provided with two combined cavities that cooperate with the pre-filter plate. When the pre-filter plate slides into the second movable frame, the two combined cavities slide towards the pre-filter plate and cooperate to form a shell sleeved on the surface of the pre-filter plate. By forming a shell covering the pre-filter plate, the oil and particulate matter intercepted on the pre-filter plate are collected to prevent secondary pollution. 2. Through the set movable mechanism, when the cylinder is started, the movable part drives the guide to insert into the guide groove through the lower frame. Under the push of the guide, the two slides move under the restriction of the longitudinal slide rail, so that the mounting frame drives the combined cavity to move in opposite directions through the second positioning groove and the first positioning part. The two combined cavities can be fitted onto the surface of the pre-filter plate. Attached Figure Description

[0013] Figure 1 A three-dimensional structural schematic diagram of an air purification adsorption device for a gravure printing machine is shown; Figure 2 A frontal cross-sectional view of the desorption device and a schematic diagram of the airflow direction are shown. Figure 3 A three-dimensional cross-sectional structural diagram of the desorption device is shown; Figure 4 A three-dimensional structural schematic diagram of the pre-filtration mechanism is shown; Figure 5 A three-dimensional structural diagram of the pre-filtration mechanism in the replacement state is shown; Figure 6 A partial three-dimensional structural schematic diagram of the pre-filtration mechanism in its working state is shown; Figure 7 A partial three-dimensional structural schematic diagram of the pre-filtration mechanism in the replacement state is shown; Figure 8 A partial three-dimensional structural schematic diagram of the active mechanism is shown; Figure 9 This diagram shows a partial three-dimensional structure of the pre-filter plate separating from the pre-filter mechanism via a movable mechanism. Figure 10 This diagram shows a partial three-dimensional structure of the pre-filter plate detaching from the desorption device via a movable mechanism. Figure 11 This diagram shows a three-dimensional structure of the pre-filter plate of the mounting chamber placed on the mounting platform. Figure 12 A three-dimensional structural schematic diagram of the desorption device and replacement port is shown; Figure 13 A three-dimensional cross-sectional view of the combined cavity is shown when the locking mechanism is unlocked; Figure 14 It shows Figure 13 Enlarged structural diagram at point A; Figure 15 A three-dimensional cross-sectional view of the combined cavity is shown when the locking mechanism is locked. Figure 16 It shows Figure 15 Enlarged structural diagram at point B; Figure 17A three-dimensional cross-sectional schematic diagram of the rotating mechanism is shown when the locking mechanism is unlocked; Figure 18 It shows Figure 17 Enlarged structural diagram at point C; Figure 19 A three-dimensional cross-sectional schematic diagram of the rotating mechanism is shown when the locking mechanism is locked. Figure 20 It shows Figure 19 A magnified structural diagram at point D.

[0014] Legend: 10. Desorption device; 11. Desorption chamber; 111. Replacement port; 12. Main filter plate; 13. Fan; 20. Pre-filtration mechanism; 21. First fixed frame; 22. First movable frame; 221. Air inlet; 23. Pre-filter plate; 24. Second fixed frame; 25. Second movable frame; 26. Combination cavity; 261. First positioning component; 27. Air duct; 30. Movable mechanism; 31. Lower frame; 311. Guide component; 32. Upper frame; 321. First positioning groove; 33. Movable component; 34. Longitudinal slide rail; 35. Slide table; 36. Guide groove; 37. Mounting bracket; 38. Second positioning groove; 39. Mounting platform; 391. Second positioning component; 310. Mounting chamber; 40. Locking mechanism; 41. First mounting platform; 42. Rotating shaft; 43. Rotating component; 44. Fitting groove; 45. Fitting part; 50. Rotating mechanism; 51. Second mounting platform; 52. Guide hole; 53. Tooth; 54. Connecting shaft; 55. Gear. Detailed Implementation

[0015] The following will describe in detail, with reference to the accompanying drawings of the embodiments of the present invention, an air purification and adsorption device for a gravure printing machine according to the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0016] To address the issue of filter plates, a core component of pretreatment systems, leaking oil and particulate matter during replacement, which can lead to the volatilization of leaked oil into gaseous organic compounds that adsorb onto particulate matter, forming more toxic secondary pollutants and causing complex hazards to the workshop environment, this invention proposes an air purification adsorption device for gravure printing machines. Figure 1 - Figure 20 As shown: The device includes a desorption device 10, which includes a desorption chamber 11 and a fan 13 for drawing in waste gas in the middle of the desorption chamber 11. A main filter plate 12 for filtering waste gas is provided at the top of the desorption chamber 11. A pre-filtration mechanism 20 is provided inside the desorption chamber 11. The pre-filtration mechanism 20 includes several first fixed frames 21 and air ducts 27 provided inside the desorption chamber 11. A first movable frame 22 is rotatably provided on the first fixed frame 21, and a pre-filter plate 23 is installed in the middle of the first movable frame 22. When the first movable frame 22 rotates to be horizontal with the air duct 27, it closes the gap between the first fixed frame 21 and the air duct 27. By starting the fan 13, the waste gas is drawn into the desorption chamber 11. After the waste gas flows through the pre-filter plate 23 for pre-filtration, it flows to the main filter plate 12 for adsorption filtration. Preferably, the bottom of the first movable frame 22 is also provided with an air inlet 221 to guide the waste gas to contact the pre-filter plate 23. In order to replace the saturated pre-filter plate 23 in a timely manner, such as Figure 4 - Figure 7 As shown, a second fixed frame 24 is provided in the desorption chamber 11. A second movable frame 25 is provided on the second fixed frame 24, which rotates synchronously with the first movable frame 22 but in the opposite direction of rotation. Preferably, the first movable frame 22 and the second movable frame 25 are both driven to rotate by a servo motor (not shown in the figure). When the first movable frame 22 and the second movable frame 25 rotate to a horizontal state, they are connected to form a channel. The pre-filter plate 23 slides along the channel into the second movable frame 25. At this time, the channel is disconnected by rotating the second movable frame 25 in the opposite direction, so that the second movable frame 25 carries the pre-filter plate 23 to a state that is horizontal with the air duct 27, waiting to remove the pre-filter plate 23 from the desorption chamber 11. like Figure 4 and Figure 12 As shown, a replacement hole 111 is provided at the bottom of the desorption chamber 11. When the second movable frame 25 drives the pre-filter plate 23 to rotate in the opposite direction until it is horizontal with the air duct 27, the end of the second movable frame 25 is connected to the replacement hole 111. The pre-filter plate 23 is inserted into or removed from the desorption chamber 11 through the replacement hole 111, thereby achieving the purpose of replacing the pre-filter plate 23.

[0017] Furthermore, to ensure that no secondary leakage occurs during the replacement of the pre-filter plate 23, such as... Figure 5 , Figure 9 - Figure 11 As shown, the second movable frame 25 is provided with two combined cavities 26 that cooperate with the pre-filter plate 23. While the pre-filter plate 23 slides into the second movable frame 25, the two combined cavities 26 slide towards the pre-filter plate 23 and cooperate to form a shell sleeved on the surface of the pre-filter plate 23. By forming a shell covering the pre-filter plate 23, the oil and particulate matter intercepted on the pre-filter plate 23 can be collected to prevent secondary pollution.

[0018] Preferred, such as Figure 8 - Figure 11 As shown, in order to adjust the position of the pre-filter plate 23, the pre-filter plate 23 slides on the first movable frame 22 via the movable mechanism 30. The movable mechanism 30 includes mounting chambers 310 disposed on both sides of the first movable frame 22, and a lower frame body 31 is slidably embedded between the two mounting chambers 310. The lower frame 31 is provided with an upper frame 32, and an installation platform 39 is slidably provided on the upper frame 32. The pre-filter plate 23 is fixedly installed in the installation platform 39. The upper frame 32 is provided with a first positioning groove 321, and the installation platform 39 is provided with a second positioning member 391 that cooperates with the first positioning groove 321. With the cooperation of the second positioning member 391 and the first positioning groove 321, the pre-filter plate 23 is restricted on the upper frame 32. The pre-filter plate 23 is installed. Preferably, the installation platform 39 closes the through hole reserved for the insertion of the pre-filter plate 23 after the two combined cavities 26 are combined, forming a completely closed shell, which further improves the sealing effect. The lower frame 31 is slidably embedded in the track opened in the side wall of the installation chamber 310 via the movable parts 33 on both sides. The length of the track in the installation chamber 310 is the moving distance of the lower frame 31. After the pre-filter plate 23 is installed on the upper frame 32, the cylinder (not shown in the figure) which is set in the installation chamber 310 and whose end is connected to the movable part 33 is activated, so that the movable part 33 moves horizontally along the length direction of the installation chamber 310 under the push of the cylinder. The movable part 33 drives the upper frame 32 to move through the lower frame 31, thereby achieving the purpose of adjusting the position of the pre-filter plate 23. When the movable part 33 moves to the end of the installation chamber 310 near the second movable frame 25, the pre-filter plate 23 is completely inserted into the second movable frame 25. When the movable part 33 moves to the end of the installation chamber 310 near the first fixed frame 21, the pre-filter plate 23 is completely inserted into the first movable frame 22.

[0019] Furthermore, in order to ensure that both second movable frames 25 can simultaneously be fitted onto the surface of the pre-filter plate 23 during its entry into the second movable frame 25, and to achieve synchronous disengagement of the pre-filter plate 23 from the second movable frame 25, as follows: Figure 8 and Figure 10 As shown, the movable mechanism 30 also includes a longitudinal slide rail 34 disposed on the second movable frame 25. Two slide tables 35 are slidably embedded on the longitudinal slide rail 34. A mounting frame 37 is disposed on the slide table 35, and a second positioning groove 38 is disposed on the mounting frame 37 that engages with the first positioning member 261 disposed on the side wall of the combined cavity 26. Both slides 35 have open guide grooves 36 on their surfaces. The lower frame 31 is provided with guide members 311 that cooperate with the two guide grooves 36 respectively. When the cylinder is started, the movable member 33 drives the guide member 311 to insert into the guide groove 36 through the lower frame 31. Under the push of the guide member 311, the two slides 35 move under the restriction of the longitudinal slide rail 34, so that the mounting frame 37 drives the combined cavity 26 to move in opposite directions through the second positioning groove 38 and the first positioning member 261. The two combined cavities 26 can be fitted onto the surface of the pre-filter plate 23.

[0020] Furthermore, such as Figure 13 - Figure 16 As shown, in order to fix the two combined cavities 26 fitted on the surface of the pre-filter plate 23 and prevent them from being separated, the two combined cavities 26 are connected by a locking mechanism 40. The locking mechanism 40 includes a first mounting platform 41 set on the mounting platform 39. A rotating shaft 42 is rotatably set on the first mounting platform 41, and two rotating parts 43 are set on the rotating shaft 42. The rotating parts 43 are provided with fitting grooves 44. The two combined cavities 26 are provided with grooves that cooperate with the first mounting platform 41, and fitting parts 45 that fit into the fitting grooves 44 are provided in the grooves. When the two combined cavities 26 are nested on the surface of the pre-filter plate 23, the two combined cavities 26 have formed a closed shell with the mounting platform 39. Then, the rotating shaft 42 is rotated, and the rotating shaft 42 drives the rotating component 43 to rotate under the restriction of the first mounting platform 41. The rotating component 43 drives the fitting groove 44 to fit with the fitting part 45 provided on the combined cavity 26. The two combined cavities 26 are connected as a whole through the fitting part 45 and the rotating component 43. At this time, the two combined cavities 26 cannot be separated, thereby achieving the purpose of fixing the position of the combined cavity 26. Preferably, in order to achieve the purpose of automatically releasing the locking of the surface-mounted combined cavity 26 when loading unused pre-filter plates 23, such as Figure 17 - Figure 20 During the process of the pre-filter plate 23 and the two combined cavities 26 moving through the replacement hole 111 and toward the mounting platform 39, the rotating mechanism 50 drives the rotating shaft 42 to rotate, causing the rotating part 43 to drive the fitting groove 44 to rotate and disengage from the fitting part 45, thus detaching the connection between the two combined cavities 26. The rotating mechanism 50 includes a second mounting platform 51 mounted on the lower frame 31. The second mounting platform 51 has a guide hole 52 and teeth 53 are provided on the inner wall of the guide hole 52. The bottom of the first mounting platform 41 is rotatably provided with a connecting shaft 54 ​​connected to the rotating shaft 42. The connecting shaft 54 ​​is provided with a gear 55 that meshes with the teeth 53. When the second movable frame 25 rotates to a state horizontal with the air duct 27 under the restriction of the second fixed frame 24, the unused pre-filter plate 23 is inserted into the desorption chamber 11 through the replacement hole 111. At this time, the surface of the pre-filter plate 23 is covered with a shell consisting of the mounting platform 39 and two combined cavities 26. As the pre-filter plate 23 inserted into the desorption chamber 11 moves into the second movable frame 25, the mounting platform 39 drives the second positioning member 391 to embed into the first positioning groove 321 to guide the connection between the mounting platform 39 and the upper frame 32. At the same time, the first positioning members 261 on both sides of the combined cavity 26 are inserted into the second positioning groove 38, so that the combined cavity 26 is connected to the slide table 35 through the mounting frame 37. As the pre-filter plate 23 continues to move into the second movable frame 25, the mounting platform 39 drives the connecting shaft 54 ​​and gear 55 to insert into the guide hole 52 opened on the second mounting platform 51 through the first mounting table 41, and makes the gear 55 mesh with the teeth 53. Under the push of the teeth 53, the gear 55 drives the rotating shaft 42 to rotate, thereby achieving the purpose of automatically releasing the restriction on the position of the combined cavity 26. As the lower frame 31 moves, the pre-filter plate 23 moves towards the air inlet 221, and the two combined cavities 26 can move and detach from the pre-filter plate 23.

[0021] Working principle: Start the fan 13 in the desorption device 10 to draw the exhaust gas into the desorption chamber 11. The exhaust gas flows through the pre-filter plate 23 for pre-filtration. The air inlet 221 guides the exhaust gas to fully contact the pre-filter plate 23. The exhaust gas after pre-filtration flows to the main filter plate 12 for adsorption filtration. The replacement process of the pre-filter plate: The first movable frame 22 and the second movable frame 25 rotate synchronously in opposite directions under the drive of the servo motor. When they rotate to the horizontal state, they connect to form a channel. The pre-filter plate 23 slides along the channel into the second movable frame 25. The second movable frame 25 rotates in the opposite direction to disconnect the channel, so that it carries the pre-filter plate 23 to rotate to the horizontal state with the air duct 27. The cylinder inside the installation chamber 310 is activated, which pushes the movable part 33 to move horizontally along the length of the installation chamber 310. The movable part 33 drives the guide part 311 through the lower frame 31 to insert into the guide groove 36 of the slide table 35. Under the push of the guide part 311, the two slide tables 35 move under the restriction of the longitudinal slide rail 34. The mounting frame 37 drives the combined cavity 26 to move in the opposite direction through the second positioning groove 38 and the first positioning part 261, and is fitted onto the surface of the pre-filter plate 23. After the two combined cavities 26 are nested on the surface of the pre-filter plate 23 and form a closed shell, the rotating shaft 42 on the first mounting platform 41 is rotated. The rotating shaft 42 drives the rotating component 43 to rotate, so that the fitting groove 44 fits into the fitting part 45 on the combined cavity 26, connecting the two combined cavities 26 into a whole and fixing the position of the combined cavity 26. When the servo motor is restarted, the second movable frame 25 rotates in the opposite direction until it is horizontal with the air duct 27. Its end is connected to the replacement hole 111 at the bottom of the desorption chamber 11, and the pre-filter plate 23 is moved out of the desorption chamber 11 through the replacement hole 111.

[0022] When installing a new pre-filter plate 23, the unused pre-filter plate 23, which is covered with a housing consisting of an installation platform 39 and two combined cavities 26, is inserted into the desorption cavity 11 through the replacement hole 111. The pre-filter plate 23 moves into the second movable frame 25, and the mounting platform 39 drives the second positioning component 391 to be embedded into the first positioning groove 321. The first positioning components 261 on both sides of the combined cavity 26 are inserted into the second positioning groove 38. The mounting platform 39 drives the connecting shaft 54 ​​and gear 55 to be inserted into the guide hole 52 through the first mounting table 41. The gear 55 meshes with the teeth 53, driving the rotating shaft 42 to rotate and releasing the position restriction on the combined cavity 26. As the lower frame 31 moves, the pre-filter plate 23 moves toward the air inlet 221, and the two combined chambers 26 move and detach from the pre-filter plate 23, completing the installation of the new pre-filter plate 23.

[0023] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the present invention's technology and inventive concept, should be covered within the scope of protection of the present invention.

Claims

1. An air purification adsorption device for a gravure printing machine, comprising a desorption device (10), the desorption device (10) comprising a desorption chamber (11) and a fan (13) for drawing in exhaust gas disposed in the middle of the desorption chamber (11), and a main filter plate (12) for filtering exhaust gas disposed at the top of the desorption chamber (11), characterized in that, The desorption chamber (11) is provided with a pre-filtration mechanism (20). The pre-filtration mechanism (20) includes a plurality of first fixed frames (21) and an air duct (27) provided in the desorption chamber (11). A first movable frame (22) is rotatably provided on the first fixed frame (21), and a pre-filter plate (23) is installed in the middle of the first movable frame (22). When the first movable frame (22) rotates to be horizontal with the air duct (27), it closes the gap between the first fixed frame (21) and the air duct (27), so that the waste gas flows through the pre-filter plate (23) for pre-filtration. In addition, a second fixed frame (24) is provided in the desorption chamber (11). A second movable frame (25) is provided on the second fixed frame (24) and rotates synchronously with the first movable frame (22) but in the opposite direction of rotation. When the first movable frame (22) and the second movable frame (25) rotate to the horizontal state, they are connected to form a channel, and the pre-filter plate (23) slides along the channel into the second movable frame (25). The second movable frame (25) is provided with two combined cavities (26) that cooperate with the pre-filter plate (23). When the pre-filter plate (23) slides into the second movable frame (25), the two combined cavities (26) slide towards the pre-filter plate (23) and cooperate to form a shell sleeved on the surface of the pre-filter plate (23). The bottom of the desorption chamber (11) is provided with a replacement hole (111). When the second movable frame (25) drives the pre-filter plate (23) to rotate in the opposite direction to be horizontal with the air duct (27), the end of the second movable frame (25) is connected to the replacement hole (111), and the pre-filter plate (23) is inserted into or removed from the desorption chamber (11) through the replacement hole (111). The pre-filter plate (23) slides on the first movable frame (22) via the movable mechanism (30). The movable mechanism (30) includes mounting chambers (310) on both sides of the first movable frame (22), and a lower frame body (31) is slidably embedded between the two mounting chambers (310). The lower frame (31) is slidably embedded in the track opened in the side wall of the installation chamber (310) through the movable parts (33) on both sides. The length of the track in the installation chamber (310) is the moving distance of the lower frame (31).

2. The air purification and adsorption device for a gravure printing machine according to claim 1, characterized in that, The lower frame (31) is provided with an upper frame (32), and an installation platform (39) is slidably provided on the upper frame (32). The pre-filter plate (23) is fixedly installed in the installation platform (39). The installation platform (39) closes the through hole reserved for the insertion of the pre-filter plate (23) after the two combined cavities (26) are combined, forming a completely closed shell. The upper frame (32) is provided with a first positioning groove (321), and the installation platform (39) is provided with a second positioning component (391) that cooperates with the first positioning groove (321).

3. The air purification and adsorption device for a gravure printing machine according to claim 2, characterized in that, The movable mechanism (30) further includes a longitudinal slide rail (34) on the second movable frame (25), two slide tables (35) are slidably embedded on the longitudinal slide rail (34), a mounting frame (37) is provided on the slide table (35), and a second positioning groove (38) is provided on the mounting frame (37) to engage with the first positioning member (261) provided on the side wall of the combined cavity (26).

4. The air purification and adsorption device for a gravure printing machine according to claim 3, characterized in that, The surfaces of the two slides (35) are provided with open guide grooves (36), and the lower frame (31) is provided with guide members (311) that cooperate with the two guide grooves (36) respectively. The guide members (311) cooperate with the guide grooves (36) to push the two slides (35) to move in opposite directions, and the two combined cavities (26) move synchronously.

5. The air purification and adsorption device for a gravure printing machine according to claim 4, characterized in that, The two combined cavities (26) are connected by a locking mechanism (40). The locking mechanism (40) includes a first mounting platform (41) set on the mounting platform (39). A rotating shaft (42) is rotatably set on the first mounting platform (41), and two rotating parts (43) are set on the rotating shaft (42). The rotating parts (43) are provided with fitting grooves (44). The two combined cavities (26) are provided with grooves that cooperate with the first mounting platform (41), and the grooves are provided with fitting parts (45) that fit into the fitting groove (44).

6. The air purification and adsorption device for a gravure printing machine according to claim 5, characterized in that, As the pre-filter plate (23) and the two combined cavities (26) pass through the replacement hole (111) and move toward the installation platform (39), the rotating mechanism (50) drives the rotating shaft (42) to rotate, causing the rotating part (43) to drive the fitting groove (44) to rotate and disengage from the fitting part (45), thus detaching the connection between the two combined cavities (26).

7. The air purification and adsorption device for a gravure printing machine according to claim 6, characterized in that, The rotating mechanism (50) includes a second mounting platform (51) provided on the lower frame (31), the second mounting platform (51) is provided with a guide hole (52), and the inner wall of the guide hole (52) is provided with teeth (53). The bottom of the first mounting platform (41) is rotatably provided with a connecting shaft (54) connected to the rotating shaft (42), and a gear (55) is provided on the connecting shaft (54) that meshes with the teeth (53).

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