An air filter device for chemical production

Abstract

The present invention relates to the technical field of filtering devices, and discloses an air filtering device for chemical production, including a ventilation barrel, wherein a filter element is provided on the inner wall of the ventilation barrel, a spring is fixedly connected to the inner wall of the ventilation barrel, a bevel is fixedly connected to the top of the spring, a rotating rod is rotatably connected to the inner wall of the ventilation barrel, and a fixed block is fixedly connected to the inner wall of the ventilation barrel. The present invention can push the filter element out from the inner wall of the ventilation barrel, thereby facilitating the replacement of the filter element and avoiding the problem that the filter element is difficult to remove. The device can be disassembled quickly and the replacement speed can be increased. When installing the filter element, the filter element can be fixed inside the ventilation barrel to avoid falling off. At the same time, dust generated on the surface of the filter element can be hung off, thereby extending the service life of the filter element, reducing the replacement frequency of the filter element, and saving the use cost.

Description

Technical Field

[0001] The invention relates to the technical field of filter devices, in particular to an air filter device for chemical production. Background Art

[0002] With the increasing awareness of environmental protection and increasingly stringent environmental regulations, chemical companies are facing greater pressure to reduce pollutant emissions. Air filtration devices must not only meet the air quality requirements during the production process, but also assume the responsibility of reducing waste gas emissions and protecting the environment.

[0003] Patent publication number CN221207225U relates to an air filter device for chemical production, which relates to the field of chemical technology. The device comprises a main body, wherein a vibration mechanism is disposed on one side of the inner wall of the main body. The vibration mechanism comprises a driving shaft, one end of which is fixedly connected to the middle portion of one side of a driven plate, and a rocker fixedly disposed on the other side of the driven plate, the outer circumference of which is slidably connected to the outer circumference of a stop rod. The device can be driven by external power to rotate the driving shaft, which in turn drives a lever on one side of the driven plate to work the stop rod, which drives the driven rod to compress a return spring on a support column, and the driven rod is further lifted under the force of the return spring. The device causes the driven rod to collide with the support frame, causing the filter to vibrate, thereby preventing the filter from clogging due to large amounts of dust adhering to the filter mesh. This provides the device with a certain self-cleaning function and improves the device's operating efficiency. However, when the filter needs to be replaced, the device must be disassembled to replace the filter, which is very troublesome and inconvenient. Therefore, an air filter device for chemical production is proposed to solve the above-mentioned problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an air filtering device for chemical production in view of the deficiencies in the above-mentioned prior art.

[0005] The circumferential surface of the push rod is threadably connected to the top of the filter pocket. The filter pocket has a check valve in it at the pump end, and the filter pocket has a check valve in it at the pump end. The filter pocket has a check valve in it at the pump end. The filter element is fixed on the inner wall of the filter element and is in contact with the rear portion of the filter element, so that the filter element is cleaned and the filter element is easily removed.

[0006] Preferably, the vibration device includes a reciprocating screw rod 2, the reciprocating screw rod 2 is rotatably connected to the inner wall of the cleaning plate, the circumferential surface of the reciprocating screw rod 2 is fixedly connected to the transmission wheel, the circumferential surface of the reciprocating screw rod 2 is provided with a sliding block, the inner wall of the sliding block is fixedly connected to a scraper, the top of the scraper is fixedly connected to a push plate, the inner wall of the ventilation barrel is fixedly connected to a fixed plate, the inner wall of the fixed plate is rotatably connected to a rotating rod 2 through a torsion spring, the circumferential surface of the rotating rod 2 is fixedly connected to a force-bearing rod, the circumferential surface of the rotating rod 2 is fixedly connected to the rotating plate, and the inner wall of the rotating plate is fixedly connected The knocking rod, the rear part of the filter element and the rear part of the scraper are in contact with each other, and the rear part of the filter element and the circular surface of the transmission wheel are in contact with each other. When the filter element is cleaned, the sliding block moves to drive the scraper to move, so that the scraper can scrape off the dust remaining in the filter element, so that the service life of the filter element can be further improved. At the same time, the dust gradually attached to the surface and internal pores of the filter element can be shaken off, so that the filtering effect of the filter element can be improved, the pores of the filter element can be unblocked again, and its good ventilation performance can be restored, ensuring that the air can pass through the filter element smoothly and maintaining normal filtration.

[0007] Preferably, the collecting device includes a collecting box, the collecting box is fixedly connected to the inner wall of the ventilation barrel, the inner wall of the collecting box is rotatably connected to a movable door by a torsion spring, the bottom of the scraper is fixedly connected to an L-shaped plate, the inner wall of the collecting box is fixedly connected to a fixing rod, the circumferential surface of the fixing rod is sleeved with a spring 2, the circumferential surface of the fixing rod is slidably connected to a push plate 2, the rear part of the push plate 2 is fixedly connected to an L-shaped block, the inner wall of the collecting box and the surface of the push plate 2 are in contact with each other, the front part of the spring 2 is fixedly connected to the rear part of the push plate 2, and when the collecting box is in contact with the inner wall of the collecting box, the front part of the spring 2 is fixedly connected to the rear part of the push plate 2. When the filter element is cleaned, the movable door generates thrust to open the movable door, so that the movable door can be opened when the scraper scrapes the dust downward, and the dust hanging behind can fall into the interior of the collection box. When the L-shaped plate is not in contact with the movable door, the movable door will be reset by the torsion spring, thereby preventing the dust from flying out and realizing automatic collection of the dust. At the same time, the movement of the L-shaped block drives the push plate 2 to move, so that the dust falling inside the collection box can be pushed to the rear of the collection box, thereby preventing the dust from accumulating at the opening of the collection box and affecting the storage space for the dust.

[0008] The present invention adopts the above technical solution, which can bring the following beneficial effects:

[0009] 1. The air filtering device for chemical production cooperates with the ventilation barrel, filter element, spring, bevel bar, rotating rod, fixed block, threaded rod, movable block, push rod, push plate, motor, pulley group, reciprocating screw, movable column and cleaning plate to operate. When the filter element starts to be replaced, the filter element can be pushed out from the inner wall of the ventilation barrel, thereby facilitating the replacement of the filter element and avoiding the problem of difficulty in removing the filter element. The device can be disassembled quickly to increase the replacement speed. When installing the filter element, the filter element can be fixed inside the ventilation barrel to avoid falling off. At the same time, the dust generated on the surface of the filter element can be hung off, thereby extending the service life of the filter element, reducing the replacement frequency of the filter element and saving the use cost.

[0010] 2. The air filtering device for chemical production cooperates with the reciprocating screw rod 2, the transmission wheel, the sliding block, the scraper, the push plate, the fixed plate, the rotating rod 2, the force-bearing rod, the rotating plate, and the knocking rod. When cleaning the filter element, the movement of the sliding block drives the movement of the scraper, so that the scraper can scrape off the dust remaining on the filter element, so as to further improve the service life of the filter element. At the same time, the dust gradually attached to the surface and internal pores of the filter element can be shaken off, so as to improve the filtering effect of the filter element, make the pores of the filter element unblocked again, restore its good ventilation performance, ensure that air can pass through the filter element smoothly, and maintain normal filtration.

[0011] 3. The air filtering device for chemical production cooperates with the collection box, the movable door, the L-shaped plate, the fixed rod, the second spring, the second push plate, and the L-shaped block. When the filter element is cleaned, the movable door generates a thrust to open the movable door, so that when the scraper is scraping the dust downward, the movable door can be opened, and the dust hanging behind can fall into the interior of the collection box. When the L-shaped plate is not in contact with the movable door, the movable door will be reset by the torsion spring, thereby preventing the dust from flying out and realizing automatic collection of the dust. At the same time, the movement of the L-shaped block drives the movement of the second push plate, thereby pushing the dust falling inside the collection box to the rear of the collection box, thereby preventing the dust from accumulating at the opening of the collection box and affecting the storage space for the dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0013] Figure 2 A half-section diagram of a rotating rod structure of the present invention;

[0014] Figure 3 For the present invention Figure 2 A magnified view of the structure at center A;

[0015] Figure 4 A half-section view of the filter element structure of the present invention;

[0016] Figure 5 For the present invention Figure 4 A magnified view of the structure at point B in the middle;

[0017] Figure 6 A half-section diagram of the movable column structure of the present invention;

[0018] Figure 7 A half-section view of the vibration device of the present invention;

[0019] Figure 8 For the present invention Figure 7 A magnified view of the structure at point C in the middle;

[0020] Figure 9 For the present invention Figure 7 A magnified view of the structure at point D in the middle;

[0021] Figure 10 It is a half-section view of the collecting device of the present invention.

[0022] In the figure: 1. ventilation barrel; 2. filter element; 3. spring 1; 4. oblique bar; 5. rotating rod 1; 6. fixed block; 7. threaded rod; 8. movable block; 9. push rod; 10. push plate 1; 11. motor; 12. pulley assembly; 13. reciprocating screw rod 1; 14. moving column; 15. vibration device; 151. reciprocating screw rod 2; 152. transmission wheel; 153. sliding block; 154. scraper; 155. push plate; 156. fixed plate; 157. rotating rod 2; 158. force rod; 159. rotating plate; 1510. knocking rod; 16. collecting device; 161. collecting box; 162. movable door; 163. L-shaped plate; 164. fixed rod; 165. spring 2; 166. push plate 2; 167. L-shaped block; 17. cleaning plate. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] See also Figures 1-10, one embodiment of the present invention is: an air filtering device for chemical production, comprising a ventilation barrel 1, the inner wall of the ventilation barrel 1 is provided with a filter element 2, the inner wall of the ventilation barrel 1 is fixedly connected with a spring 3, the top of the spring 3 is fixedly connected with a bevel bar 4, the inner wall of the ventilation barrel 1 is rotatably connected with a rotating rod 5, the inner wall of the ventilation barrel 1 is fixedly connected with a fixed block 6, the rear part of the rotating rod 5 is fixedly connected with a threaded rod 7, the circumferential surface of the threaded rod 7 is threadedly connected with a movable block 8, the inner wall of the movable block 8 is fixedly connected with a push rod 9, the circumferential surface of the push rod 9 is fixedly connected with a push plate 10, when the filter element 2 is replaced, the rotating rod 5 is driven to rotate by twisting the handle on the rotating rod 5, and the rotating rod 5 rotates to drive the threaded rod 7 to rotate, and the threaded rod 7 The rotation drives the movable block 8 to move forward, and the movable block 8 contacts the spiral groove on the surface of the threaded rod 7 through the slider provided inside and then moves. The movable block 8 will contact the inner wall of the ventilation barrel 1 when moving, so that the movable block 8 will be limited and will not rotate with the rotation of the threaded rod 7. The movable block 8 moves forward to drive the push rod 9 to move, and the movement of the push rod 9 drives the push plate 10 to move, so that the filter element 2 can be pushed out from the inner wall of the ventilation barrel 1, thereby facilitating the replacement of the filter element 2, avoiding the problem that the filter element 2 is difficult to take out, and can quickly realize the disassembly of the device, improve the replacement speed, and then when installing the filter element 2, the filter element 2 will produce a downward squeezing force on the oblique bar 4, causing the oblique bar 4 to move downward. When the filter element 2 passes over the oblique bar 4, the oblique bar The strip 4 will be reset by the spring 3, and then drive the inclined strip 4 to move upward, so that the filter element 2 can be fixed inside the ventilation barrel 1 to avoid falling off. The inner wall of the ventilation barrel 1 is fixedly connected to the motor 11, and the output end of the motor 11 is fixedly connected to the pulley group 12. The central axis of the pulley above the pulley group 12 is fixedly connected to the reciprocating screw 13, and the circumferential surface of the reciprocating screw 13 is movably connected to the moving column 14. The rear part of the filter element 2 is provided with a vibration device 15 for improving the filtering effect, and the inner wall of the ventilation barrel 1 is provided with a collection device 16 for collecting dust. The circumferential surface of the moving column 14 is fixedly connected to a cleaning plate 17. The front part of the filter element 2 is in contact with the rear part of the inclined strip 4, and the inner wall of the fixed block 6 is in contact with the push rod 9 is slidably connected, the inner wall of the filter element 2 is in contact with the movable block 8, the front part of the push plate 10 is in contact with the rear part of the filter element 2, the inner wall of the ventilation barrel 1 is rotatably connected with the reciprocating screw 13, and the rear part of the filter element 2 is in contact with the front part of the cleaning plate 17. At the same time, after the filter element 2 is installed, the motor 11 will be started regularly, and the motor 11 starts to drive the pulley group 12 to rotate, and the rotation of the pulley group 12 drives the reciprocating screw 13 to rotate, and the rotation of the reciprocating screw 13 drives the moving column 14 to move left and right, and the movement of the moving column 14 drives the cleaning plate 17 to move, so that the dust generated on the surface of the filter element 2 can be hung off, thereby extending the service life of the filter element 2, reducing the replacement frequency of the filter element 2, and saving the use cost.

[0025] The vibration device 15 includes a reciprocating screw rod 151, which is rotatably connected to the inner wall of the cleaning plate 17. The circumferential surface of the reciprocating screw rod 151 is fixedly connected to a transmission wheel 152. The circumferential surface of the reciprocating screw rod 151 has a sliding block 153. The inner wall of the sliding block 153 is fixedly connected to a scraper 154. When the filter element 2 is cleaned, the cleaning plate 17 moves to drive the reciprocating screw rod 151 to move, and the reciprocating screw rod 151 moves to drive the transmission wheel 152 to move. The movement of the transmission wheel 152 will contact the filter element 2. 2 contacts and generates friction to drive the transmission wheel 152 to rotate, the rotation of the transmission wheel 152 drives the reciprocating screw rod 151 to rotate, the rotation of the reciprocating screw rod 151 drives the sliding block 153 to move up and down, and the movement of the sliding block 153 drives the scraper 154 to move, so that the scraper 154 can scrape off the dust remaining on the filter element 2, so that the service life of the filter element 2 can be further improved. The top of the scraper 154 is fixedly connected to the pushing plate 155, and the inner wall of the ventilation barrel 1 is fixedly connected to the fixing plate 156. The inner wall of the fixed plate 156 is connected to the rotating rod 157 through a torsion spring, and the circumferential surface of the rotating rod 157 is fixedly connected to the force rod 158, and the circumferential surface of the rotating rod 157 is fixedly connected to the rotating plate 159. The inner wall of the rotating plate 159 is fixedly connected to the knocking rod 1510. The rear of the filter element 2 contacts the rear of the scraper 154, and the rear of the filter element 2 contacts the circular surface of the transmission wheel 152. At the same time, when the scraper 154 moves and drives the push plate 155 to move upward, the push plate 155 will contact the force rod 158. The force rod 158 contacts and pushes the force-bearing rod 158 to rotate. The rotation of the force-bearing rod 158 drives the rotating rod 2 157 to rotate. The rotation of the rotating rod 2 157 drives the rotating plate 159 to rotate. The rotation of the rotating plate 159 drives the knocking rod 1510 to rotate, so that the dust gradually attached to the surface and internal pores of the filter element 2 can be shaken off, so that the filtering effect of the filter element 2 can be improved, the pores of the filter element 2 can be unblocked again, and its good ventilation performance can be restored, ensuring that the air can pass through the filter element 2 smoothly and maintain normal filtration.

[0026] Working principle: When the filter element 2 starts to be replaced, the handle on the rotating rod 5 is twisted to drive the rotating rod 5 to rotate, and the rotation of the rotating rod 5 drives the threaded rod 7 to rotate, and the rotation of the threaded rod 7 drives the movable block 8 to move forward. The movable block 8 contacts the spiral groove on the surface of the threaded rod 7 through the slider provided inside and then moves. When moving, the movable block 8 will contact the inner wall of the ventilation barrel 1, so that the movable block 8 will be limited and will not rotate with the rotation of the threaded rod 7. The movable block 8 moves forward and drives the push rod 9 to move, and the movement of the push rod 9 drives the push plate 10 to move, so that the filter element 2 can be pushed out from the inner wall of the ventilation barrel 1, thereby facilitating the replacement of the filter element 2, avoiding the problem of the filter element 2 being difficult to remove, and can quickly realize the disassembly of the device, improve the replacement speed, and then install it. When the filter element 2 is installed, the filter element 2 will generate a downward squeezing force on the bevel bar 4, causing the bevel bar 4 to move downward. When the filter element 2 passes over the bevel bar 4, the bevel bar 4 will be reset by the spring 13, thereby driving the bevel bar 4 to move upward, so that the filter element 2 can be fixed inside the ventilation barrel 1 to avoid falling off. At the same time, after the filter element 2 is installed, the motor 11 will be started regularly, and the motor 11 starts to drive the pulley group 12 to rotate, and the rotation of the pulley group 12 drives the reciprocating screw 13 to rotate, and the rotation of the reciprocating screw 13 drives the moving column 14 to move left and right, and the movement of the moving column 14 drives the cleaning plate 17 to move, so that the dust generated on the surface of the filter element 2 can be scraped off, thereby extending the service life of the filter element 2, reducing the replacement frequency of the filter element 2, and saving the use cost.

[0027] When cleaning the filter element 2, the cleaning plate 17 moves to drive the reciprocating screw rod 151 to move, and the reciprocating screw rod 151 moves to drive the transmission wheel 152 to move. The transmission wheel 152 contacts the filter element 2 and generates friction to drive the transmission wheel 152 to rotate. The rotation of the transmission wheel 152 drives the reciprocating screw rod 151 to rotate. The rotation of the reciprocating screw rod 151 drives the sliding block 153 to move up and down. The movement of the sliding block 153 drives the scraper 154 to move, so that the scraper 154 can scrape off the dust remaining in the filter element 2, so that the service life of the filter element 2 can be further improved. When plate 154 moves and drives the pushing plate 155 to move upward, the pushing plate 155 will contact the force-bearing rod 158 and push the force-bearing rod 158 to rotate. The rotation of the force-bearing rod 158 drives the rotating rod 2 157 to rotate. The rotation of the rotating rod 2 157 drives the rotating plate 159 to rotate. The rotation of the rotating plate 159 drives the knocking rod 1510 to rotate, so that the dust gradually attached to the surface and internal pores of the filter element 2 can be shaken off, so that the filtering effect of the filter element 2 can be improved, the pores of the filter element 2 can be unblocked again, and its good ventilation performance can be restored, ensuring that the air can pass through the filter element 2 smoothly and maintain normal filtration.

[0028] See also Figures 1-10On the basis of the above embodiment, in another embodiment of the present invention, the collecting device 16 includes a collecting box 161, which is fixedly connected to the inner wall of the ventilation barrel 1, and the inner wall of the collecting box 161 is rotatably connected to a movable door 162 by a torsion spring. The bottom of the scraper 154 is fixedly connected to an L-shaped plate 163. When cleaning the filter element 2, when the scraper 154 drives the L-shaped plate 163 to move downward, the L-shaped plate 163 will contact the movable door 162 and generate a thrust for the movable door 162 to open the movable door 162, so that the movable door 162 can be opened when the scraper 154 scrapes the dust downward, and the dust hanging behind can fall into the interior of the collecting box 161. When the L-shaped plate 163 is no longer in contact with the movable door 162, the movable door 162 will be reset by the torsion spring, so that To prevent dust from flying out and realize automatic collection of dust, the inner wall of the collection box 161 is fixedly connected with a fixing rod 164, and the circumferential surface of the fixing rod 164 is sleeved with a spring 2 165. The circumferential surface of the fixing rod 164 is slidably connected with a push plate 2 166, and the rear part of the push plate 2 166 is fixedly connected with an L-shaped block 167. The inner wall of the collection box 161 and the surface of the push plate 2 166 are in contact with each other, and the front part of the spring 2 165 is fixedly connected to the rear part of the push plate 2 166. At the same time, the movable door 162 rotates to contact the L-shaped block 167 and push the L-shaped block 167 to move backward. The movement of the L-shaped block 167 drives the push plate 2 166 to move, so that the dust falling inside the collection box 161 can be pushed to the rear part of the collection box 161, thereby preventing dust from accumulating at the opening of the collection box 161 and affecting the storage space for dust.

[0029] Working principle: When cleaning the filter element 2, when the scraper 154 drives the L-shaped plate 163 to move downward, the L-shaped plate 163 will contact the movable door 162 and generate a thrust on the movable door 162 to open the movable door 162, so that the movable door 162 can be opened when the scraper 154 scrapes the dust downward, and the dust hanging behind can fall into the interior of the collection box 161. When the L-shaped plate 163 is no longer in contact with the movable door 162, the movable door 162 will be reset by the torsion spring, thereby preventing the dust from flying out and realizing automatic collection of the dust. At the same time, the movable door 162 rotates to contact the L-shaped block 167 and push the L-shaped block 167 to move backward. The movement of the L-shaped block 167 drives the push plate 2 166 to move, thereby pushing the dust falling inside the collection box 161 to the rear of the collection box 161, thereby preventing the dust from accumulating at the opening of the collection box 161 and affecting the storage space for dust.

[0030] The present invention provides an air filtration device for chemical production. There are numerous methods and approaches for implementing this technical solution. The above is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also within the scope of protection of the present invention. Any components not specified in this embodiment may be implemented using existing technologies.

Claims

1. An air filtration device for chemical production, comprising a ventilation barrel (1), characterized in that: The inner wall of the ventilation barrel (1) is provided with a filter element (2), the inner wall of the ventilation barrel (1) is fixedly connected to a spring (3), the top of the spring (3) is fixedly connected to an oblique bar (4), the inner wall of the ventilation barrel (1) is rotatably connected to a rotating rod (5), the inner wall of the ventilation barrel (1) is fixedly connected to a fixed block (6), the rear part of the rotating rod (5) is fixedly connected to a threaded rod (7), the circumferential surface of the threaded rod (7) is threadedly connected to a movable block (8), the inner wall of the movable block (8) is fixedly connected to a push rod (9), the circumferential surface of the push rod (9) is fixedly connected to a push plate ( 10), the inner wall of the ventilation barrel (1) is fixedly connected to a motor (11), the output end of the motor (11) is fixedly connected to a pulley group (12), the central axis of the pulley above the pulley group (12) is fixedly connected to a reciprocating screw rod (13), the circumferential surface of the reciprocating screw rod (13) is movably connected to a moving column (14), the rear part of the filter element (2) is provided with a vibration device (15) for improving the filtering effect, the inner wall of the ventilation barrel (1) is provided with a collection device (16) for collecting dust, and the circumferential surface of the moving column (14) is fixedly connected to a cleaning plate (17); The vibration device (15) includes a second reciprocating screw rod (151), the second reciprocating screw rod (151) is rotatably connected to the inner wall of the cleaning plate (17), the circumferential surface of the second reciprocating screw rod (151) is fixedly connected to a transmission wheel (152), the circumferential surface of the second reciprocating screw rod (151) has a sliding block (153), the inner wall of the sliding block (153) is fixedly connected to a scraper (154), and the top of the scraper (154) is fixedly connected to a push plate (155); The inner wall of the ventilation barrel (1) is fixedly connected to a fixed plate (156), the inner wall of the fixed plate (156) is rotatably connected to a second rotating rod (157) via a torsion spring, the circumferential surface of the second rotating rod (157) is fixedly connected to a force-bearing rod (158), the circumferential surface of the second rotating rod (157) is fixedly connected to a rotating plate (159), and the inner wall of the rotating plate (159) is fixedly connected to a knocking rod (1510).

2. An air filter device for chemical production according to claim 1, characterized in that: The front portion of the filter core (2) contacts the rear portion of the oblique strip (4), the inner wall of the fixed block (6) is slidably connected to the circumferential surface of the push rod (9), and the inner wall of the filter core (2) contacts the movable block (8).

3. An air filter device for chemical production according to claim 2, characterized in that: The front of the push plate 1 (10) contacts the rear of the filter core (2), the inner wall of the ventilation barrel (1) is rotatably connected to the reciprocating screw rod 1 (13), and the rear of the filter core (2) contacts the front of the cleaning plate (17).

4. An air filtration device for chemical production according to claim 3, characterized in that: The rear portion of the filter core (2) contacts the rear portion of the scraper (154), and the rear portion of the filter core (2) contacts the circular surface of the transmission wheel (152).

5. An air filtration device for chemical production according to claim 4, characterized in that: The collecting device (16) includes a collecting box (161), the collecting box (161) is fixedly connected to the inner wall of the ventilation barrel (1), the inner wall of the collecting box (161) is rotatably connected to a movable door (162) via a torsion spring, the bottom of the scraper (154) is fixedly connected to an L-shaped plate (163), the inner wall of the collecting box (161) is fixedly connected to a fixing rod (164), the circumferential surface of the fixing rod (164) is sleeved with a spring 2 (165), the circumferential surface of the fixing rod (164) is slidably connected to a push plate 2 (166), and the rear of the push plate 2 (166) is fixedly connected to an L-shaped block (167).

6. An air filtration device for chemical production according to claim 5, characterized in that: The inner wall of the collecting box (161) contacts the surface of the second push plate (166), and the front of the second spring (165) is fixedly connected to the rear of the second push plate (166).

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