Air purification system for plastic production workshop

Abstract

The invention relates to the technical field of workshop air purification equipment, in particular to a plastic production workshop air purification system which comprises an air purification air pipe, a filter plate storage box and a filter plate replacement box, the filter plate storage box and the filter plate replacement box are connected to the two sides of the air purification air pipe correspondingly, and a driving box is connected to the bottom of the air purification air pipe; air supply pipes are connected between the purification air outlet pipe and the waste gas adsorption pipe and the two groups of air pipe joints; a primary filter, a medium-efficiency filter, a cooling coil, a heating coil and an air pipe fan are sequentially arranged between one end, close to the waste gas adsorption pipe, of the air purification air pipe and one end, close to the purification air outlet pipe, of the air purification air pipe; according to the device, the cleanliness of gas is guaranteed through two times of filtration and purification, the function of adjusting the temperature of a workshop is achieved by heating and cooling the gas, the filter plate for filtration can be replaced without shutdown, toxic gas can be prevented from escaping in the replacement process, and the safety of the working environment is guaranteed.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of workshop air purification equipment, and particularly relates to a plastic production workshop air purification system. BACKGROUND

[0002] A large amount of waste gas is generated in the process of plastic production, and the waste gas is particularly harmful to the health of workers in the closed environment of the workshop. Therefore, in order to ensure the safety of the production environment, an air purification system for the workshop needs to be set up.

[0003] In the prior art, through retrieval, the Chinese patent application with the application number 202321761001.9 discloses a ventilation device for a plastic extrusion workshop. When the ventilation fan is used to ventilate the plastic extrusion workshop, the motor is started to drive the fan blades on the shaft to rotate. The fan blades blow air into the workshop from the ventilation fan. The filter cotton and the filter screen are placed in the threaded groove, and the protective screen is threadedly connected to the threaded groove to clamp and fix the filter cotton and the filter screen. The filter cotton and the filter screen can effectively filter impurities in the air, thereby achieving the dust suppression effect of the air entering the ventilation fan. However, in some large production workshops, due to environmental protection requirements, the noise and pollution of the production workshop need to be small, that is, the workshop needs to maintain a relatively closed environment. Therefore, the waste gas generated in the plastic production workshop needs to be purified and recycled in the workshop. In addition, the filter equipment in the existing workshop air purification system needs to be stopped for cleaning and replacement. However, in some large workshops, long-term uninterrupted production and processing work is required. When stopped, production work cannot be carried out, which will affect the production efficiency.

[0004] Therefore, a plastic production workshop air purification system is designed to solve the above problems. SUMMARY

[0005] To solve the problems in the background art, the application provides a plastic production workshop air purification system. The existing ventilation device for a plastic extrusion workshop still has certain limitations. Due to environmental protection requirements, the noise and pollution of the production workshop need to be small, that is, the workshop needs to maintain a relatively closed environment. Therefore, the waste gas generated in the plastic production workshop needs to be purified and recycled in the workshop. In addition, the filter equipment in the existing workshop air purification system needs to be stopped for cleaning and replacement. However, in some large workshops, long-term uninterrupted production and processing work is required. When stopped, production work cannot be carried out, which will affect the production efficiency.

[0006] In order to achieve the above object, the present application provides the following technical scheme: a plastic production workshop air purification system, comprising an air purification air pipe, a filter plate storage box and a filter plate replacement box, both ends of the air purification air pipe are respectively connected with a purification air outlet pipe and a waste gas adsorption pipe, the filter plate storage box and the filter plate replacement box are respectively connected on both sides of the air purification air pipe, and the bottom of the air purification air pipe is connected with a drive box; Both ends of the air purification air pipe are provided with air pipe joints, the purification air outlet pipe and the waste gas adsorption pipe are respectively connected with two groups of air pipe joints, and between the air pipe joints and the two groups of air pipe joints, a supply air pipe is arranged.

[0007] Preferably, the air purification air pipe and the bottom of the primary filter and the medium filter are provided with fixed sliding plates, and both ends of the two groups of fixed sliding plates extend into the filter plate storage box and the filter plate replacement box, respectively, and the fixed sliding plates are provided with two groups of connecting sliding grooves.

[0008] Preferably, the air purification air pipe and the filter plate storage box and the filter plate replacement box are provided with connecting door plates, and the connecting door plates are provided with two groups of door holes, the inner sides of the door holes are connected with sealing rubber pads, and the outer sides of the door holes are connected with inner box doors, and the connecting parts of the inner box doors and the door holes are provided with spring hinges.

[0009] Preferably, the top of the drive box is connected with the air purification air pipe, the filter plate storage box and the filter plate replacement box, the fixed sliding plates are fastened to the connecting parts of the air purification air pipe, the filter plate storage box and the filter plate replacement box and the air purification air pipe, and the side of the drive box close to the filter plate storage box is connected with a filter plate replacement air cylinder.

[0010] Preferably, the outer sides of the primary filter and the medium filter are connected with filter plate frames, and the lower sides of the filter plate frames are connected with sliding gear plates, the sliding gear plates are inserted into the connecting sliding grooves of the fixed sliding plates, and the inner sides of the primary filter and the medium filter are connected with connecting sliding plates.

[0011] Preferably, three-axis drive shafts are connected with the drive box through bearings, and the three groups of drive shafts are respectively located on the symmetrical axes of the air purification air pipe, the filter plate storage box and the filter plate replacement box, a transmission gear is connected with the drive shaft close to the filter plate storage box, and the three groups of drive shafts are connected with each other through two groups of belts.

[0012] Preferably, the two ends of the driving rotating shaft are connected with one-way driving ratchets, the one-way driving ratchet comprises an inner driving rotating wheel and an outer driving moving gear, the outer driving moving gear is engaged with a sliding gear plate, a driving gear plate engaged with a transmission gear is connected on the telescopic shaft of the filter plate replacement air cylinder, and the end of the driving gear plate away from the filter plate replacement air cylinder is connected with a replacement push plate.

[0013] Preferably, the outer driving moving gear is provided with a one-way limiting clamping groove, and the inner driving rotating wheel is arranged in the one-way limiting clamping groove, the top of the inner driving rotating wheel is connected with a one-way limiting clamping block and a clamping block limiting elastic block through a rotating shaft, and one end of the clamping block limiting elastic block is attached to the inner side of the one-way limiting clamping block.

[0014] Preferably, the bottom of the waste gas adsorption pipe is connected with a plurality of waste gas suction pipes, and the bottom of the purification air outlet pipe is connected with a plurality of clean air outlet pipes, and the filter plate storage box and the filter plate replacement box are connected with box doors through rotating shafts at the ends away from the air purification air pipe.

[0015] Preferably, the outer side of the air pipe joint is connected with an air inlet and outlet switch motor, and a plurality of opening and closing air resistance plates are arranged in the air pipe joint, one end of the opening and closing air resistance plate is connected with the air inlet and outlet switch motor through a rotating shaft, and the opening and closing air resistance plate and the air pipe joint are connected through a damping rotating shaft.

[0016] Compared with the prior art, the present application has the following advantages: 1. In the present application, the cleanliness of the gas is ensured by twice filtration and purification, and the function of adjusting the temperature of the workshop is realized by heating and cooling the gas to ensure the comfort of the production workshop, the waste gas generated by the plastic production equipment is absorbed by the waste gas suction pipe and sent into the waste gas adsorption pipe, and the adsorbed waste gas is sent into the air purification air pipe by the waste gas adsorption pipe for purification, the waste gas is first subjected to preliminary filtration by the primary filter to intercept large particles in the waste gas, and small particles in the waste gas are intercepted at the medium efficiency filter, and the purified gas can be cooled by the cooling coil and heated by the heating coil according to the climate, and the treated gas is circulated by the air pipe fan and pumped into the purification air outlet pipe through the air supply pipe, and the purified air is discharged to the work station through the clean air outlet pipe.

[0017] 2、In the present application, the filter plate can be replaced without stopping the machine. The primary filter and the medium filter in the filter plate storage box are moved by the replacement push plate. The driving gear plate drives the driving gear and the driving shaft connected to it to rotate during the movement. The driving shaft drives the other two groups of driving shafts to rotate synchronously through the belt. The inner driving wheel in the one-way driving ratchet at both ends of the driving shaft rotates during the rotation. The outer driving moving gear drives the sliding gear plate and the primary filter and the medium filter connected to it to move during the rotation. The replaced primary filter and medium filter are pushed into the filter plate replacement box. The primary filter and the medium filter in the filter plate storage box and the filter plate replacement box can be taken out by opening the box door. The one-way driving ratchet ensures that the filter plate replacement cylinder will not affect the position of the primary filter and the medium filter when it is retracted.

[0018] 3、In the present application, the toxic gas can be prevented from escaping during the replacement, ensuring the safety of the working environment. During the replacement of the primary filter and the medium filter, the primary filter moves between the air purification air pipe, the filter plate storage box and the filter plate replacement box, and passes through the door hole connected to the door plate. During the movement, the primary filter and the medium filter are always in contact with the sealing rubber mat on both sides to ensure that no waste gas enters the filter plate storage box or the filter plate replacement box through the gap. During the movement of the primary filter and the medium filter, the box door is always pressed, keeping the connecting door plate open. After the replacement of the primary filter and the medium filter is completed, all the box doors on the two connecting door plates are completely open, and the door holes on the two connecting door plates are in a closed state with the primary filter and the medium filter inside. The box door is always pressed down by the spring hinge to prevent the primary filter and the medium filter from sliding accidentally. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application and are used to explain the present application, and do not constitute a limitation on the present application. In the drawings: Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a schematic diagram of the side cross-sectional structure of the air purification air pipe of the present application; Figure 3 It is a schematic diagram of the front cross-sectional structure of the air purification air pipe of the present application; Figure 4 It is a schematic diagram of the fixed sliding plate of the present application; Figure 5 It is a schematic diagram of the fixed sliding plate of the present application; Figure 6 It is a perspective structural schematic diagram of the primary filter of the application; Figure 7 It is a structural schematic diagram of the connecting structure of the driving shaft of the application; Figure 8 It is a perspective structural schematic diagram of the one-way driving ratchet of the application.

[0020] In the figure: 1, air purification air pipe; 11, air pipe joint; 111, air switch motor; 112, open and close air resistance plate; 12, primary filter; 121, filter plate frame; 122, connecting sliding plate; 123, sliding gear plate; 13, medium efficiency filter; 14, cooling coil; 15, heating coil; 16, air pipe fan; 17, fixed sliding plate; 171, connecting sliding groove; 18, connecting door plate; 181, door hole; 182, in-box door; 183, sealing rubber gasket; 184, spring hinge; 2, air supply pipe; 3, purification air outlet pipe; 31, purified air outlet pipe; 4, waste gas adsorption pipe; 41, waste gas air suction pipe; 5, filter plate storage box; 51, box door; 6, filter plate replacement box; 7, driving box; 71, filter plate replacement air cylinder; 711, driving gear plate; 712, replacement push plate; 72, driving shaft; 721, transmission gear; 73, one-way driving ratchet; 731, inner driving wheel; 7311, one-way limiting clamping block; 7312, clamping block limiting elastic block; 732, outer driving moving gear; 7321, one-way limiting clamping groove. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0022] As Figures 1-8 shown in a plastic production workshop air purification system, comprising air purification air pipe 1, filter plate storage box 5 and filter plate replacement box 6, the two ends of air purification air pipe 1 are connected with purification air outlet pipe 3 and waste gas adsorption pipe 4 respectively, filter plate storage box 5 and filter plate replacement box 6 are connected on the two sides of air purification air pipe 1 respectively, and the bottom of air purification air pipe 1 is connected with driving box 7; The air purification air duct 1 is provided with air duct joints 11 at both ends, the purification air outlet duct 3 and the waste gas adsorption pipe 4 are connected with the two groups of air duct joints 11, and the air purification air duct 1 is sequentially provided with a primary filter 12, a medium filter 13, a cooling coil 14, a heating coil 15 and an air duct fan 16 between the end close to the waste gas adsorption pipe 4 and the end close to the purification air outlet duct 3; the adsorbed waste gas is sent into the air purification air duct 1 through the air duct 2 for purification, and the waste gas first passes through the primary filter 12 for preliminary filtration to intercept large particles in the waste gas, and small particles in the waste gas are intercepted at the medium filter 13, and the purified gas can be cooled by the cooling coil 14 and heated by the heating coil 15 according to the climate, and the treated gas is circulated by the air duct fan 16 to be pumped into the purification air outlet duct 3 through the air duct 2, and the primary filter 12 and the medium filter 13 are common gas filtration equipment, which can adsorb large and small particles in the gas respectively, and the cooling coil 14, the heating coil 15 and the air duct fan 16 are common indoor temperature adjusting equipment such as air conditioners or air duct machines, and the above equipment are common equipment known to those skilled in the art which can be directly purchased on the market, and can be customized or selected according to actual needs, here we only use them and do not improve their structure and function, and we will not go into details.

[0023] The air purification air duct 1 is provided with fixed slides 17 at the connection of the primary filter 12 and the medium filter 13, and the two ends of the two groups of fixed slides 17 extend into the filter plate storage box 5 and the filter plate replacement box 6 respectively, and the fixed slides 17 are provided with two groups of connecting sliding grooves 171; the filter plate storage box 5 can store the primary filter 12 and the medium filter 13 for replacement, and the filter plate replacement box 6 is used to store the primary filter 12 and the medium filter 13 replaced from the air purification air duct 1, and the primary filter 12 and the medium filter 13 slide in the connecting sliding grooves 171 of the fixed slides 17 during replacement.

[0024] The connecting door plate 18 is arranged between the air purification air pipe 1 and the filter plate storage box 5 and the filter plate replacement box 6, and two groups of door holes 181 are arranged in the connecting door plate 18, the inner side of the door hole 181 is connected with a sealing rubber pad 183, and the outer side of the door hole 181 is connected with an inner box door 182, and the connecting place of the inner box door 182 and the door hole 181 is provided with a spring hinge 184; the primary filter 12 and the medium filter 13 pass through the door hole 181 of the connecting door plate 18 in the moving process between the air purification air pipe 1, the filter plate storage box 5 and the filter plate replacement box 6, and the two sides of the primary filter 12 and the medium filter 13 are always attached to the sealing rubber pad 183 in the moving process, so as to ensure that waste gas cannot enter the filter plate storage box 5 or the filter plate replacement box 6 from the gap, and the primary filter 12 and the medium filter 13 always press the inner box door 182 in the moving process, so that the connecting door plate 18 remains in an open state, and when the primary filter 12 and the medium filter 13 are replaced, all the inner box doors 182 on the two groups of connecting door plates 18 are in a completely open state, and the door holes 181 on the two groups of connecting door plates 18 are in a closed state with the primary filter 12 and the medium filter 13 inside, and the inner box door 182 is always pressed down to the primary filter 12 and the medium filter 13 by the elastic force of the spring hinge 184 in the open state, so as to prevent the primary filter 12 and the medium filter 13 from sliding accidentally, and the spring hinge 184 is a common hinge structure, and its structure and function are not improved, which will not be described in detail here.

[0025] The top of the driving box 7 is communicated with the air purification air pipe 1, the filter plate storage box 5 and the filter plate replacement box 6, and the fixed sliding plate 17 buckles the connection of the air purification air pipe 1, the filter plate storage box 5 and the filter plate replacement box 6 and the air purification air pipe 1, and the filter plate replacement cylinder 71 is connected to the side of the driving box 7 close to the filter plate storage box 5; the outer side of the primary filter 12 and the medium filter 13 is connected with the filter plate frame 121, and the lower side of the filter plate frame 121 is connected with the sliding gear plate 123, the sliding gear plate 123 is inserted into the connecting sliding groove 171 of the fixed sliding plate 17, and the inner side of the primary filter 12 and the medium filter 13 is connected with the connecting sliding plate 122, so that the two are connected; the driving box 7 is connected with the three-axis driving shaft 72 through the bearing, and the three groups of driving shafts 72 are respectively located on the symmetric shafts of the air purification air pipe 1, the filter plate storage box 5 and the filter plate replacement box 6, the driving shaft 72 close to the filter plate storage box 5 is connected with the transmission gear 721, and the three groups of driving shafts 72 are connected two by two through two groups of belts; the two ends of the driving shaft 72 are connected with the one-way driving ratchet wheel 73, the one-way driving ratchet wheel 73 includes the inner driving rotating wheel 731 and the outer driving moving gear 732, the outer driving moving gear 732 is engaged with the sliding gear plate 123, the telescopic shaft of the filter plate replacement cylinder 71 is connected with the driving gear plate 711 engaged with the transmission gear 721, and the end of the driving gear plate 711 away from the filter plate replacement cylinder 71 is connected with the replacement push plate 712; the driving gear plate 711 and the replacement push plate 712 on the top thereof driven by the filter plate replacement cylinder 71 are moved, and the primary filter 12 and the medium filter 13 can be moved by the replacement push plate 712, and the driving gear plate 711 drives the transmission gear 721 and the group of driving shafts 72 connected therewith to rotate in the moving process, the driving shaft 72 drives the other two groups of driving shafts 72 to rotate synchronously through the belt, and the inner driving rotating wheel 731 in the one-way driving ratchet wheel 73 at both ends of the driving shaft 72 rotates together in the rotating process, wherein the outer driving moving gear 732 drives the sliding gear plate 123 and the primary filter 12 and the medium filter 13 connected therewith to move in the rotating process.

[0026] The outer drive moving gear 732 is internally provided with a one-way limiting clamping groove 7321, and the inner drive rotating wheel 731 is arranged in the one-way limiting clamping groove 7321. The top of the inner drive rotating wheel 731 is connected with a one-way limiting clamping block 7311 and a clamping block limiting elastic block 7312 through a rotating shaft. One end of the clamping block limiting elastic block 7312 is attached to the inner side of the one-way limiting clamping block 7311. A plurality of inclined clamping grooves are arranged on the one-way limiting clamping groove 7321. The inner drive rotating wheel 731 rotates in the one-way limiting clamping groove 7321. The one-way limiting clamping block 7311 rotates together with the inner drive rotating wheel 731 in the process of rotation. When the one-way limiting clamping block 7311 rotates in the direction of the one-way limiting clamping groove 7321, the inner drive rotating wheel 731 can drive the outer drive moving gear 732 to rotate through the one-way limiting clamping block 7311. At this time, the primary filter 12 and the medium filter 13 move towards the filter plate replacement box 6. When the one-way limiting clamping block 7311 rotates against the direction of the one-way limiting clamping groove 7321, the one-way limiting clamping block 7311 moves to the center of the inner drive rotating wheel 731 under the extrusion of the one-way limiting clamping groove 7321, and the clamping block limiting elastic block 7312 is extruded by the one-way limiting clamping block 7311. At this time, the inner drive rotating wheel 731 will not drive the outer drive moving gear 732 to rotate. This makes the filter plate replacement cylinder 71 not affect the position of the primary filter 12 and the medium filter 13 when it is retracted and reset. After stopping rotating, the one-way limiting clamping block 7311 can be reset and attached to the one-way limiting clamping groove 7321 under the elastic action of the clamping block limiting elastic block 7312.

[0027] A plurality of waste gas suction pipes 41 are connected to the bottom of the waste gas adsorption pipe 4, and a plurality of clean air outlet pipes 31 are connected to the bottom of the purification air outlet pipe 3. The filter plate storage box 5 and the filter plate replacement box 6 are both connected with a box door 51 through a rotating shaft at the end away from the air purification pipe 1. An air inlet and outlet switch motor 111 is connected to the outside of the air pipe joint 11, and a plurality of opening and closing air resistance plates 112 are arranged in the air pipe joint 11. One end of the opening and closing air resistance plate 112 is connected with the air inlet and outlet switch motor 111 through a rotating shaft. The opening and closing air resistance plate 112 and the air pipe joint 11 are connected through a damping rotating shaft. The waste gas suction pipe 41 is arranged on the plastic production equipment, and the waste gas generated by the plastic production equipment is absorbed by the waste gas suction pipe 41. The purified air is discharged to the work station through the clean air outlet pipe 31. The primary filter 12 and the medium filter 13 in the filter plate storage box 5 and the filter plate replacement box 6 can be taken out by opening the box door 51.

[0028] Working principle: First, the waste gas suction pipe 41 is set on the plastic production equipment, and the waste gas generated by the plastic production equipment is absorbed by the waste gas suction pipe 41 and sent to the waste gas adsorption pipe 4, and the waste gas adsorption pipe 4 sends the adsorbed waste gas through the air supply pipe 2 to the air purification duct 1 for purification. The waste gas first passes through the primary filter 12 for preliminary filtration to intercept large particles in the waste gas, and intercepts small particles in the waste gas at the medium efficiency filter 13, and the purified and filtered gas can be filtered according to the According to the climate, the air is cooled by the cooling coil 14 and heated by the heating coil 15. The treated gas is circulated through the air supply pipe 2 and pumped into the purification outlet pipe 3 by the air duct fan 16. The purified air is discharged to the workstation through the clean air outlet pipe 31. The opening and closing of the air purification duct 1 is controlled by the air duct joint 11, and the air duct joint 11 can be opened and closed by the opening and closing air blocker 112. The rotation of the opening and closing air blocker 112 is controlled by the air inlet and outlet switch motor 111. When the primary filter 12 and the medium filter 13 have been adsorbed for too long, too much solid waste will accumulate inside, which will affect the purification effect. The primary filter 12 and the medium filter 13 can be replaced without stopping the machine through the drive box 7. The filter plate replacement cylinder 71 drives the driving gear plate 711 and the replacement push plate 712 on its top to move, and the replacement push plate 712 can push the primary filter 12 and the medium filter 13 in the filter plate storage box 5 to move. During the movement, the driving gear plate 711 drives the transmission gear 721 and a group of driving shafts 72 connected thereto to rotate. The driving shaft 72 drives the other two sets of driving shafts 72 to rotate synchronously through the belt, and the inner driving wheels 731 in the one-way driving ratchet 73 at both ends of the driving shaft 72 rotate together during the rotation, wherein the outer driving moving gear 732 drives the sliding gear plate 123 and the primary filter 12 and the medium filter 13 connected thereto to move during the rotation, and pushes the replaced primary filter 12 and the medium filter 13 into the filter plate replacement box 6, and the primary filter 12 and the medium filter 13 in the filter plate storage box 5 and the filter plate replacement box 6 can be taken in and placed by opening the box door 51.

[0029] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An air purification system for a plastic production workshop, characterized by: It comprises an air purification duct (1), a filter plate storage box (5) and a filter plate replacement box (6), wherein the two ends of the air purification duct (1) are respectively connected to a purification air outlet duct (3) and an exhaust gas adsorption pipe (4), the filter plate storage box (5) and the filter plate replacement box (6) are respectively connected to the two sides of the air purification duct (1), and the bottom of the air purification duct (1) is connected to a drive box (7); Both ends of the air purification duct (1) are provided with duct joints (11), and the purification outlet duct (3) and the exhaust gas adsorption tube (4) are connected to the two sets of duct joints (11) with air supply ducts (2), and the air purification duct (1) is provided with a primary filter (12), a medium efficiency filter (13), a cooling coil (14), a heating coil (15) and a duct fan (16) in sequence between the end of the air purification duct (1) close to the exhaust gas adsorption tube (4) and the end close to the purification outlet duct (3).

2. The air purification system for a plastic production workshop according to claim 1, characterized in that: The connection between the air purification duct (1) and the bottom of the primary filter (12) and the intermediate filter (13) is provided with a fixed slide plate (17), and the two ends of the two sets of the fixed slide plates (17) extend into the filter plate storage box (5) and the filter plate replacement box (6), respectively. The fixed slide plates (17) are provided with two sets of connecting chutes (171).

3. The air purification system for a plastic production workshop according to claim 2, characterized in that: A connecting door panel (18) is provided between the air purification duct (1) and the filter plate storage box (5) and the filter plate replacement box (6), and two sets of door openings (181) are provided in the connecting door panel (18), the inner sides of the door openings (181) are connected to sealing rubber pads (183), and the outer sides of the door openings (181) are connected to an inner door (182), and a spring hinge (184) is provided at the connection between the inner door (182) and the door opening (181).

4. The air purification system for a plastic production workshop according to claim 3, characterized in that: The top of the driving box (7) is connected to the air purification duct (1), the filter plate storage box (5) and the filter plate replacement box (6), and the fixed slide plate (17) is engaged with the connection between the air purification duct (1), the filter plate storage box (5) and the filter plate replacement box (6) and the air purification duct (1), and the filter plate replacement cylinder (71) is connected to the side of the driving box (7) close to the filter plate storage box (5).

5. The air purification system for a plastic production workshop according to claim 4, characterized in that: The outer sides of the primary filter (12) and the medium filter (13) are both connected to a filter plate frame (121), and the lower side of the filter plate frame (121) is connected to a sliding gear plate (123), and the sliding gear plate (123) is inserted into the connecting groove (171) of the fixed slide plate (17), and the inner sides of the primary filter (12) and the medium filter (13) are both connected to a connecting slide plate (122).

6. The air purification system for a plastic production workshop according to claim 5, characterized in that: The drive box (7) is connected to three drive shafts (72) via bearings, and the three groups of drive shafts (72) are respectively located on the symmetrical axes of the air purification duct (1), the filter plate storage box (5), and the filter plate replacement box (6). A transmission gear (721) is connected to the group of drive shafts (72) close to the filter plate storage box (5). The three groups of drive shafts (72) are connected in pairs via two groups of belts.

7. The air purification system for a plastic production workshop according to claim 6, characterized in that: Both ends of the driving shaft (72) are connected to a one-way driving ratchet (73), the one-way driving ratchet (73) comprising an inner driving rotating wheel (731) and an outer driving movable gear (732), the outer driving movable gear (732) being meshed with a sliding gear plate (123), the telescopic shaft of the filter plate replacement cylinder (71) being connected to a driving gear plate (711) meshed with a transmission gear (721), and the end of the driving gear plate (711) away from the filter plate replacement cylinder (71) being connected to a replacement push plate (712).

8. The air purification system for a plastic production workshop according to claim 7, characterized in that: A one-way limiting slot (7321) is provided in the outer driving movable gear (732), and the inner driving rotating wheel (731) is provided in the one-way limiting slot (7321). The top of the inner driving rotating wheel (731) is connected to a one-way limiting block (7311) and a block limiting elastic block (7312) via a rotating shaft, and one end of the block limiting elastic block (7312) is fitted on the inner side of the one-way limiting block (7311).

9. The air purification system for a plastic production workshop according to claim 1, characterized in that: The bottom of the exhaust gas adsorption pipe (4) is connected to a plurality of exhaust gas suction pipes (41), and the bottom of the purification air outlet pipe (3) is connected to a plurality of clean air outlet pipes (31). The filter plate storage box (5) and the filter plate replacement box (6) are both connected to a box door (51) at one end away from the air purification air duct (1) via a rotating shaft.

10. The air purification system for a plastic production workshop according to claim 4, characterized in that: The outside of the air duct joint (11) is connected to an air inlet and outlet switch motor (111), and a plurality of opening and closing air blocking plates (112) are provided inside the air duct joint (11), one end of the opening and closing air blocking plates (112) is connected to the air inlet and outlet switch motor (111) via a rotating shaft, and the opening and closing air blocking plates (112) and the air duct joint (11) are connected via a damping rotating shaft.

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