A waste gas recovery apparatus

Abstract

The application discloses a waste gas recovery equipment, and particularly relates to the technical field of waste gas treatment, which comprises a recovery tank, one end of the recovery tank is provided with an air inlet, the other end of the recovery tank is provided with an air outlet, the inside of the recovery tank is provided with a filter plate one, the inside of the recovery tank is provided with a swing structure at one end, the swing structure comprises a base, the base is fixedly installed at the inside of the recovery tank at one end, the inside of the base is rotatably connected with a swing arm, one end of the swing arm is fixedly connected with a gas conveying box, and the top of the gas conveying box is provided with a connecting port one. In the process of recovering waste gas, the waste gas and water can be uniformly sprayed on the surface of the filter plate one, so that the filtering effect is better, and the generated sundries and water can be collected, so as to avoid the blockage of the inside bottom of the filter plate one and the recovery tank.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, and more specifically to a waste gas recovery device. Background Technology

[0002] As a common pollutant in the atmosphere, exhaust gas causes serious air pollution. Most exhaust gas is caused by industrial emissions and needs to be recycled and treated to minimize air pollution.

[0003] Chinese patent publication number "CN218608686U" discloses "An environmental protection treatment and recovery device for industrial waste gas containing volatile organic compounds, relating to the field of environmental protection, including a shell, a power rod installed inside the shell, a filter screen sleeved on the power rod, a first motor installed on the top of the shell, and the output end of the first motor fixedly connected to the power rod." Although it eliminates the need for manual cleaning of the filter screen, saving labor, water and dust debris fall to the bottom inside the shell during filter screen cleaning. There is no corresponding cleaning mechanism to clean the bottom inside the shell, which leads to the accumulation of dust and debris on the inside of the shell over time. Furthermore, there is no corresponding cleaning mechanism for the filter screen surface, and it is difficult to clean the debris on the filter screen by spraying alone. Moreover, relying solely on the filter screen to filter waste gas is inefficient and has poor filtration effect. Summary of the Invention

[0004] The purpose of this invention is to provide a waste gas recovery device that can improve filtration efficiency.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A waste gas recovery device includes a recovery box, an air inlet at one end of the recovery box, an air outlet at the other end of the recovery box, a filter plate inside the recovery box, and a swing structure at one end of the inner side of the recovery box.

[0007] The swing structure includes a base, which is fixedly installed on one end of the inner side of the recycling bin. A swing arm is rotatably connected to the inner side of the base. One end of the swing arm is fixedly connected to an air supply box. The top of the air supply box is provided with a connection port. A concave rod is slidably arranged on the inner side of the swing arm. One end of the concave rod is rotatably installed on the inner side of the recycling bin. The other end of the concave rod passes through the inner side of the recycling bin and is connected to a rotating wheel. The rotating wheel is connected to a rotating wheel via a belt. A motor is installed at the front of the recycling bin. The output shaft of the motor is connected to the rotating wheel. A reciprocating screw is rotatably arranged on the inner side of the recycling bin. One end of the reciprocating screw passes through the inner side of the recycling bin and is connected to the rotating wheel. A sliding plate is slidably arranged on the outside of the reciprocating screw. A cleaning plate is slidably arranged on one side of the filter plate. A connecting arm is rotatably installed on the top of the sliding plate and is connected to the cleaning plate by bolts.

[0008] As a further embodiment of the present invention, a spray assembly is provided at the bottom of the gas delivery box. The spray assembly includes a water delivery box, which is fixedly installed at the bottom of the gas delivery box. A second connection port is provided at the bottom of the water delivery box, and a plurality of nozzles are provided on one side of the water delivery box. A water inlet is provided at one end of the recycling box.

[0009] As a further embodiment of the present invention, the bottom inner side of the recycling bin has two square holes, and the bottom of the recycling bin is provided with two sets of recycling components. The recycling components include a bottom box adapted to the square holes. The bottom box is fixedly installed at the bottom of the recycling bin. A reserved opening is provided on the outside of the bottom box. A collection cylinder is rotatably arranged inside the bottom box, and both ends of the collection cylinder pass through both ends of the bottom box. A limiting toothed ring is provided at one end of the collection cylinder. An F-shaped plate is fixedly connected to one end of the bottom box. A threaded rod is threadedly connected to the F-shaped plate. One end of the threaded rod is rotatably connected to a limiting toothed plate, and the limiting toothed plate and the limiting toothed ring mesh and match.

[0010] As a further embodiment of the present invention, two guide plates are fixedly installed inside the recycling box, and several air inlets are provided on one side of the air delivery box.

[0011] As a further embodiment of the present invention, an adjustment structure is provided at the other end of the inner side of the recycling bin. The adjustment structure includes a shell, which is fixedly installed inside the recycling bin. A storage box is rotatably installed inside the shell. Several filter plates are provided on both sides of the storage box. Several grooves are opened on the outside of the storage box. An elastic component is provided inside the groove. The elastic component includes three telescopic rods. The telescopic rods are located at the bottom of the groove. An arc-shaped plate is movably arranged inside the groove. One end of each of the three telescopic rods is fixedly connected to the arc-shaped plate. Three springs are provided between one side of the arc-shaped plate and the bottom of the groove. The springs are located on the periphery of the corresponding telescopic rods.

[0012] As a further embodiment of the present invention, both the front of the outer shell and the front of the recycling bin are provided with a bayonet, and a locking block is movably disposed on the inner side of the bayonet. The locking block is adaptively matched with the groove. The front of the recycling bin is provided with a limiting component, which includes a sliding rod and a limiting block. The top of the sliding rod is fixedly connected to the front of the recycling bin, and the limiting block is slidably connected to the sliding rod. The top of the locking block is provided with an insertion port, and the limiting block is adaptively matched with the insertion port of the locking block.

[0013] As a further embodiment of the present invention, an adjustment assembly is provided at the other end of the recycling bin. The adjustment assembly includes a baffle plate, which is fixedly installed at the other end of the recycling bin. A second motor is provided on one side of the baffle plate. The output shaft of the second motor passes through the baffle plate and is connected to a rotating frame. The rotating frame is connected to a storage box. Two threaded holes are provided on one side of the storage box. Two fixing plates are fixedly provided at one end of the rotating frame, and the fixing plates are also provided with threaded holes. A hanging plate is installed on one side of the baffle plate. Two screws are provided on the top of the hanging plate, and the threads of the screws are compatible with the threads of the rotating frame and the fixing plates.

[0014] The beneficial effects that can be achieved by the above embodiments of the present invention include:

[0015] 1. By setting up a spray assembly in conjunction with a swing structure, it is beneficial to evenly spray exhaust gas and water onto the surface of filter plate one through the air supply box and water supply box respectively, avoiding the exhaust gas and water being sprayed only in one place on filter plate one. It can also neutralize water and exhaust gas, enhance filtration efficiency, and at the same time, it can work with the cleaning plate to thoroughly clean the debris on filter plate one, preventing filter plate one from clogging.

[0016] 2. By setting up recycling components in conjunction with a swinging structure, it is beneficial to collect water and debris generated inside the recycling bin into the collection tube for unified treatment via a sliding plate and cleaning plate, thus avoiding the accumulation of debris at the bottom of the recycling bin that is difficult to handle.

[0017] 3. By setting up a guide plate in conjunction with a swing structure, it is beneficial to prevent water from flowing into other areas inside the recycling tank after passing through the filter plate, which facilitates the collection work of the collection cylinder;

[0018] 4. By setting an adjustment structure, the equipment can adjust the working state of the rotating frame as needed, allowing the rotating frame to switch between cleaning filter plate two and driving the storage box to rotate, thus avoiding clogging of filter plate two while replacing the activated carbon filter block inside the storage box.

[0019] 5. By setting a limiting component in conjunction with the adjustment structure, it is beneficial to cooperate with the storage box to perform limiting work, so that the storage box is fixed when the rotating frame cleans the filter plate 2, ensuring its working stability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a waste gas recovery device according to the present invention;

[0021] Figure 2 This is a schematic diagram of the overall cross-sectional three-dimensional structure of a waste gas recovery device according to the present invention;

[0022] Figure 3 This is a three-dimensional structural diagram of the base and swing arm of a waste gas recovery device according to the present invention.

[0023] Figure 4 This is a three-dimensional structural diagram of the connecting arm and cleaning plate of a waste gas recovery device according to the present invention.

[0024] Figure 5 This invention relates to a waste gas recovery device. Figure 4 Enlarged view of point A in the middle;

[0025] Figure 6 This is a three-dimensional structural diagram of the bottom box of a waste gas recovery device according to the present invention;

[0026] Figure 7 This invention relates to a waste gas recovery device. Figure 6 Enlarged view at point B in the middle;

[0027] Figure 8 This is a three-dimensional structural diagram of the collection cylinder of a waste gas recovery device according to the present invention;

[0028] Figure 9 This is a three-dimensional structural diagram showing the shell, storage box, and rotating frame of a waste gas recovery device according to the present invention.

[0029] Figure 10 This is a three-dimensional structural diagram of the storage box, filter plate 2, and telescopic rod of a waste gas recovery device according to the present invention.

[0030] Figure 11 This invention relates to a waste gas recovery device. Figure 10 Enlarged view at point C;

[0031] Figure 12 This is a schematic side view of the overall structure of a waste gas recovery device according to the present invention;

[0032] Figure 13 This is a schematic diagram of the overall front structure of a waste gas recovery device according to the present invention;

[0033] Figure 14This is a diagram showing the initial position of the swing arm of a waste gas recovery device according to the present invention;

[0034] Figure 15 This is a demonstration diagram of the upward swing of the swing arm of a waste gas recovery device according to the present invention;

[0035] Figure 16 This is a demonstration diagram of the downward swinging arm of a waste gas recovery device according to the present invention.

[0036] In the diagram: 1. Recycling bin; 2. Air inlet; 3. Filter plate one; 4. Swinging structure; 5. Adjustment structure; 6. Base; 7. Swing arm; 8. Air delivery box; 9. Connection port one; 10. Concave rod; 11. Rotary wheel one; 12. Motor one; 13. Belt; 14. Rotary wheel two; 15. Reciprocating screw; 16. Slide plate; 17. Connecting arm; 18. Cleaning plate; 19. Water delivery box; 20. Connection port two; 21. Water inlet; 22. Base box; 23. Collection cylinder; 24. Limiting toothed ring; 25. F-shaped plate; 26. Threaded rod; 27. Limiting toothed plate; 28. Guide plate; 29. ​​Outer shell; 30. Storage box; 31. Filter plate II; 32. Rotating frame; 33. Fixing plate; 34. Telescopic rod; 35. Arc plate; 36. Spring; 37. Locking block; 38. Sliding rod; 39. Limiting block; 40. Baffle; 41. Motor II; 42. Screw. Detailed Implementation

[0037] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] like Figures 1-16 As shown, a waste gas recovery device includes a recovery box 1, an air inlet 2 at one end of the recovery box 1, an air outlet at the other end of the recovery box 1, a filter plate 3 inside the recovery box 1, and a swing structure 4 at one end of the inner side of the recovery box 1.

[0039] The swing structure 4 includes a base 6, which is fixedly installed on one end of the inner side of the recycling bin 1. A swing arm 7 is rotatably connected to the inner side of the base 6. An air supply box 8 is fixedly connected to one end of the swing arm 7. A connection port 9 is provided on the top of the air supply box 8. A concave rod 10 is slidably arranged on the inner side of the swing arm 7. One end of the concave rod 10 is rotatably installed on the inner side of the recycling bin 1. The other end of the concave rod 10 passes through the inner side of the recycling bin 1 and is connected to a first rotating wheel 11. The first rotating wheel 11 is connected to a second rotating wheel 14 via a belt 13. A motor 12 is installed at the front of the recycling bin 1. The output shaft of the motor 12 is connected to the rotating wheel 11. A reciprocating screw 15 is rotatably installed inside the recycling bin 1. One end of the reciprocating screw 15 passes through the inside of the recycling bin 1 and is connected to the rotating wheel 14. A sliding plate 16 is slidably installed outside the reciprocating screw 15. A cleaning plate 18 is slidably installed on one side of the filter plate 3. A connecting arm 17 is rotatably installed on the top of the sliding plate 16 and is connected to the cleaning plate 18 by bolt fasteners.

[0040] The swing structure 4 allows the exhaust gas from the gas delivery box 8 and the water inside the water delivery box 19 to be evenly sprayed onto the surface of the filter plate 3, so that the exhaust gas can be neutralized by the water and filtered by the filter plate 3 at the same time.

[0041] The bottom of the air supply box 8 is provided with a spray assembly, which includes a water supply box 19. The water supply box 19 is fixedly installed at the bottom of the air supply box 8. The bottom of the water supply box 19 is provided with a connection port 20, and a number of nozzles are provided on one side of the water supply box 19. One end of the recovery box 1 is provided with a water inlet 21.

[0042] The spray assembly allows the exhaust gas to be neutralized with water, and can also be used with the cleaning plate 18 to clean the filter plate 3.

[0043] Two square holes are opened on the inner bottom of the recycling bin 1. Two sets of recycling components are provided on the bottom of the recycling bin 1. The recycling components include a bottom box 22 that is adapted to the square holes. The bottom box 22 is fixedly installed on the bottom of the recycling bin 1. A reserved opening is opened on the outside of the bottom box 22. A collection cylinder 23 is rotatably arranged on the inner side of the bottom box 22. Both ends of the collection cylinder 23 pass through both ends of the bottom box 22. A limiting toothed ring 24 is provided on one end of the collection cylinder 23. An F-shaped plate 25 is fixedly connected to one end of the bottom box 22. A threaded rod 26 is threadedly connected to the F-shaped plate 25. One end of the threaded rod 26 is rotatably connected to a limiting toothed plate 27. The limiting toothed plate 27 and the limiting toothed ring 24 are meshed and matched.

[0044] The recycling component can collect water and debris generated inside the recycling bin 1, while ensuring the sealing of the recycling bin 1 during operation.

[0045] The inside of the recycling box 1 is fixedly installed with two guide plates 28, and several air inlets are provided on one side of the air supply box 8.

[0046] The deflector plate 28 blocks the water sprayed from the water box 19, preventing it from flowing into other areas.

[0047] An adjustment structure 5 is provided at the other end of the inner side of the recycling bin 1. The adjustment structure 5 includes a shell 29, which is fixedly installed inside the recycling bin 1. A storage box 30 is rotatably installed inside the shell 29. Several filter plates 31 are provided on both sides of the storage box 30. Several grooves are opened on the outside of the storage box 30. Elastic components are provided inside the grooves. The elastic components include three telescopic rods 34, which are located at the bottom of the grooves. An arc-shaped plate 35 is movably arranged inside the grooves. One end of each of the three telescopic rods 34 is fixedly connected to the arc-shaped plate 35. Three springs 36 are provided between one side of the arc-shaped plate 35 and the bottom of the groove. The springs 36 are located on the periphery of the corresponding telescopic rods 34.

[0048] Adjustment structure 5 can adjust the working state of rotating frame 32 as needed. With screw 42, it can drive storage box 30 to rotate, and replace the activated carbon filter block inside. When motor 41 works alone on rotating frame 32, it can clean the surface of filter plate 31 to prevent it from clogging.

[0049] Both the front of the outer casing 29 and the front of the recycling bin 1 are provided with a bayonet. A locking block 37 is movably provided on the inner side of the bayonet. The locking block 37 is adapted to the groove. A limiting component is provided on the front of the recycling bin 1. The limiting component includes a slide rod 38 and a limiting block 39. The top of the slide rod 38 is fixedly connected to the front of the recycling bin 1. The limiting block 39 is slidably connected to the slide rod 38. An insertion port is provided on the top of the locking block 37. The insertion port of the limiting block 39 is adapted to the insertion port of the locking block 37.

[0050] The limiting component, together with the locking block 37, can limit the position of the storage box 30, preventing the corresponding activated carbon filter block inside from falling out, and at the same time restricting the movement of the storage box 30.

[0051] An adjustment assembly is provided at the other end of the recycling bin 1. The adjustment assembly includes a baffle 40, which is fixedly installed at the other end of the recycling bin 1. A second motor 41 is provided on one side of the baffle 40. The output shaft of the second motor 41 passes through the baffle 40 and is connected to a rotating frame 32. The rotating frame 32 is connected to a storage box 30. Two threaded holes are provided on one side of the storage box 30. Two fixing plates 33 are fixedly provided at one end of the rotating frame 32. The fixing plates 33 are also provided with threaded holes. A hanging plate is installed on one side of the baffle 40. Two screws 42 are provided on the top of the hanging plate. The threads of the screws 42 are compatible with the threads of the rotating frame 32 and the fixing plates 33.

[0052] The adjustment component, in conjunction with the storage box 30, allows the storage box 30 to be rotated, facilitating the replacement of the activated carbon filter block.

[0053] It should be noted that when using this invention, an external connecting pipe is connected between one end of the air inlet 2 and the first connecting port 9, and a water pipe is also connected between one end of the water inlet 21 and the second connecting port 20. Then, an activated carbon filter block is installed inside the groove of the storage box 30, and the device can be operated by starting the first motor 12 and the second motor 41.

[0054] Exhaust gas enters through air inlet 2, and water enters through water inlet 21. Motor 12 rotates wheel 11, causing wheel 11 to rotate around the output shaft of motor 12 via concave rod 10. Concave rod 10 then reciprocates up-and-down swinging motion on swing arm 7, allowing exhaust gas to be evenly sprayed onto the surface of filter plate 3 through the air outlet of air delivery box 8. Simultaneously, water from water delivery box 19 is also evenly sprayed onto the surface of filter plate 3 through nozzles. Wheel 11 rotates wheel 14 via belt 13, which in turn rotates reciprocating screw 15. This causes slide plate 16 to slide synchronously with cleaning plate 18 via connecting arm 17, cleaning debris from the surface of filter plate 3. The water falls to the bottom inside the recycling bin 1, and the slide plate 16 cleans the debris and water from the bottom inside the recycling bin 1 into the corresponding square hole inside the recycling bin 1, and finally flows into the collection cylinder 23. During the process, the water passes through the filter plate 3 under the action of the nozzle and is blocked by the two guide plates 28 to prevent the water from continuing to flow into other areas inside the recycling bin 1. When the water and debris inside the collection cylinder 23 need to be treated, the collection device is placed at the bottom of the bottom box 22, and the threaded rod 26 is rotated to move it in the opposite direction of the limiting toothed ring 24 to a certain position and stop. At this time, the limiting toothed plate 27 is removed, and the collection cylinder 23 is no longer restricted. The collection cylinder 23 is rotated to a certain position so that the water and debris inside the collection cylinder 23 can be poured into the collection device.

[0055] Motor 41 rotates the rotating frame 32, causing the rotating frame 32 to act on the filter plates 31 on both sides of the storage box 30, cleaning the debris on the surface of the filter plates 31. When it is necessary to replace the activated carbon filter block inside the storage box 30, stop rotating motor 41, remove the screws 42 on the hanging plate, and install them in the corresponding positions of the fixing plate 33 and the rotating frame 32. Pull the limiting block 39 in the opposite direction to the locking block 37, moving it to the matching position of the sliding rod 38. At this time, the locking block 37 is no longer restricted, and the locking block 37 can be removed. The activated carbon filter block inside the storage box 30 is pushed out by the spring 36 and the arc plate 35. The new activated carbon filter block can be installed. If the activated carbon filter block in other positions needs to be replaced, start the motor 41 to rotate the rotating frame 32 and the storage box 30 synchronously to the matching position and then stop. At this time, the replacement work can be completed by the same operation as before. After the replacement is completed, install the locking block 37 in the initial position, put down the limiting block 39 to fix the position of the limiting block 39, and then remove the screw 42 to hang it on the hanging plate.

Claims

1. A waste gas recovery device, comprising a recovery box (1), wherein an air inlet (2) is provided at one end of the recovery box (1), an air outlet is provided at the other end of the recovery box (1), and a filter plate (3) is provided inside the recovery box (1), characterized in that: The recycling bin (1) is provided with a swing structure (4) on one end of its inner side; The swing structure (4) includes a base (6), which is fixedly installed on one end of the inner side of the recycling bin (1). A swing arm (7) is rotatably connected to the inner side of the base (6). One end of the swing arm (7) is fixedly connected to an air supply box (8). A connection port (9) is provided on the top of the air supply box (8). A concave rod (10) is slidably provided on the inner side of the swing arm (7). One end of the concave rod (10) is rotatably installed on the inner side of the recycling bin (1). The other end of the concave rod (10) passes through the inner side of the recycling bin (1) and is connected to a rotating wheel (11). The rotating wheel (11) is connected to a rotating shaft via a belt (13). Wheel 2 (14), a motor 1 (12) is installed at the front of the recycling box (1), the output shaft of the motor 1 (12) is connected to the wheel 1 (11), a reciprocating screw (15) is rotatably arranged on the inner side of the recycling box (1), one end of the reciprocating screw (15) passes through the inner side of the recycling box (1) and is connected to the wheel 2 (14), and a sliding plate (16) is slidably arranged on the outside of the reciprocating screw (15), a cleaning plate (18) is slidably arranged on one side of the filter plate 1 (3), and a connecting arm (17) is rotatably installed on the top of the sliding plate (16), and the connecting arm (17) is connected to the cleaning plate (18) by bolt fasteners; The bottom of the gas delivery box (8) is provided with a spray assembly, which includes a water delivery box (19). The water delivery box (19) is fixedly installed at the bottom of the gas delivery box (8). The bottom of the water delivery box (19) is provided with a connection port (20), and a number of nozzles are provided on one side of the water delivery box (19). One end of the recycling box (1) is provided with a water inlet (21). The recycling bin (1) has two square holes on its inner bottom. The bottom of the recycling bin (1) is provided with two sets of recycling components. The recycling components include a bottom box (22) that is adapted to the square holes. The bottom box (22) is fixedly installed on the bottom of the recycling bin (1). The bottom box (22) has a reserved opening on its exterior. A collection cylinder (23) is rotatably provided on the inner side of the bottom box (22). Both ends of the collection cylinder (23) pass through both ends of the bottom box (22). One end of the collection cylinder (23) is provided with a limiting toothed ring (24). One end of the bottom box (22) is fixedly connected with an F-shaped plate (25). The F-shaped plate (25) is connected to a threaded rod (26) by a thread. One end of the threaded rod (26) is rotatably connected to a limiting toothed plate (27), and the limiting toothed plate (27) and the limiting toothed ring (24) are meshed and matched.

2. The waste gas recovery device according to claim 1, characterized in that: The recycling box (1) has two guide plates (28) fixedly installed inside, and the gas delivery box (8) has several gas delivery ports on one side.

3. The waste gas recovery device according to claim 1, characterized in that: An adjustment structure (5) is provided at the other end of the inner side of the recycling bin (1). The adjustment structure (5) includes a shell (29), which is fixedly installed inside the recycling bin (1). A storage box (30) is rotatably installed inside the shell (29). Several filter plates (31) are provided on both sides of the storage box (30). Several grooves are opened on the outside of the storage box (30). An elastic component is provided inside the groove. The elastic component includes three telescopic rods (34). The telescopic rods (34) are located at the bottom of the groove. An arc plate (35) is movably arranged inside the groove. One end of each of the three telescopic rods (34) is fixedly connected to the arc plate (35). Three springs (36) are provided between one side of the 35) and the bottom of the groove. The springs (36) are located on the periphery of the corresponding telescopic rod (34). The front of the outer shell (29) and the front of the recycling bin (1) are provided with a bayonet. A locking block (37) is movably provided on the inner side of the bayonet. The locking block (37) is adapted to the groove. The front of the recycling bin (1) is provided with a limiting component. The limiting component includes a slide rod (38) and a limiting block (39). The top of the slide rod (38) is fixedly connected to the front of the recycling bin (1). The limiting block (39) is slidably connected to the slide rod (38). The top of the locking block (37) is provided with an insertion port. The limiting block (39) is adapted to the insertion port of the locking block (37).

4. The waste gas recovery device according to claim 3, characterized in that: An adjustment assembly is provided at the other end of the recycling bin (1). The adjustment assembly includes a baffle (40). The baffle (40) is fixedly installed at the other end of the recycling bin (1). A motor (41) is provided on one side of the baffle (40). The output shaft of the motor (41) passes through the baffle (40) and is connected to a rotating frame (32). The rotating frame (32) is connected to the storage box (30). Two threaded holes are opened on one side of the storage box (30). Two fixing plates (33) are fixedly provided at one end of the rotating frame (32). The fixing plates (33) are also provided with threaded holes. A hanging plate is installed on one side of the baffle (40). Two screws (42) are provided on the top of the hanging plate. The threads of the screws (42) are matched with the threads of the rotating frame (32) and the fixing plates (33).

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