Waste gas filtering mechanism of double-screw extruder for processing filling master batch

Abstract

The invention discloses a waste gas filtering mechanism of a double-screw extruder for filling master batch processing, and relates to the technical field of filtering membranes, the waste gas filtering mechanism comprises a shell, two ends of the shell are open and are respectively connected with a gas inlet pipe fitting and a gas outlet pipe fitting; the air inlet pipe fitting is rotationally communicated with a group of air entraining assemblies located in the shell, and the air entraining assemblies are arranged corresponding to air pipes arranged on the side part of the shell; the top of the air entraining assembly is rotationally connected with an inner shell through a connecting bearing, the two ends of the inner shell are open, and the top end of the inner shell is fixedly connected with the air outlet pipe. A group of membrane components I and a membrane component II of which the membrane aperture is smaller than that of the membrane component I are sequentially arranged in the inner shell from bottom to top, and the membrane components I are fixedly connected with the air entraining component. According to the invention, the treatment efficiency of waste gas generated during operation of the double-screw extruder for filling master batch processing can be improved, and the deposition time of pollutants in the waste gas on the surface of a membrane is reduced, so that membrane pollution is effectively prevented, the replacement period of a membrane material is prolonged, and the long-term operation cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of filter membranes, in particular to an exhaust gas filtering mechanism of a twin-screw extruder used for processing filler masterbatch. Background Art

[0002] Twin screw extruders used for filling masterbatch processing will produce exhaust gas during operation, which may contain volatile organic compounds (VOCs), dust, smoke and other harmful substances. In order to protect the environment and employee health, these exhaust gases must be effectively filtered and treated.

[0003] At present, the most commonly used twin-screw extruder exhaust gas filtration mechanism in the market is the ultrafiltration device. The membrane element of the ultrafiltration device adopts a hollow fiber membrane, which has unique advantages in the application of twin-screw extruder exhaust gas filtration for filling masterbatch processing. The hollow fiber membrane can effectively remove a variety of pollutants, not only effectively reducing VOCs emissions, but also significantly reducing the amount of dust and other particulate matter, while maintaining low operating costs and maintenance frequency. However, during the use of the existing ultrafiltration device, the hollow fiber membrane is in a static state. This design has the following disadvantages:

[0004] 1. When the surface of the hollow fiber membrane is exposed to exhaust gas containing pollutants for a long time, particulate matter, oil, volatile organic compounds (VOCs), etc. will gradually adhere to the membrane surface, forming a layer of dirt that is difficult to remove, resulting in a decrease in membrane flux and filtration efficiency, and may even completely block the membrane pores;

[0005] 2. Due to the lack of dynamic renewal of hollow fiber membranes, some areas may be overloaded with pollutants while other areas are underutilized, resulting in uneven distribution of contamination on the membrane surface, aggravating the blockage problem in some areas and reducing the effective adsorption area. Summary of the invention

[0006] The purpose of the present invention is to solve the problems raised in the above background technology, and then proposes a twin-screw extruder exhaust gas filtering mechanism for filling masterbatch processing.

[0007] The technical solution adopted by the present invention to solve the technical problem is:

[0008] The exhaust gas filtering mechanism of a twin-screw extruder for processing a filling masterbatch comprises an outer shell, both ends of which are open and respectively connected with an air inlet pipe and an air outlet pipe; a group of air bleed components located inside the outer shell are rotatably connected on the air inlet pipe, and the air bleed components are arranged correspondingly to the air duct arranged on the side of the outer shell, so that the air bleed components are horizontally rotated after the external wind blows to the air bleed components through the air duct, and negative pressure suction is generated at the position of the air bleed components; an inner shell is rotatably connected to the top of the air bleed component through a connecting bearing, and both ends of the inner shell are open and the top end is fixedly connected to the air outlet pipe, so that the inner shell remains stationary when the air bleed component rotates; a group of membrane components 1 and membrane components 2 with a membrane pore size smaller than that of the membrane components 1 are arranged in sequence from bottom to top in the inner shell, and the membrane components 1 are fixedly connected to the air bleed components, so that the membrane components 1 and the membrane components 2 form a gradient and continuous rotating filter membrane structure in the inner shell, and after the exhaust gas enters through the position of the air inlet pipe, the negative pressure suction generated by the position of the exhaust gas bleed component is introduced into the rotating filter membrane structure for treatment, and the filtered exhaust gas is discharged from the air outlet pipe.

[0009] Further to the above scheme, the air intake pipe includes an air intake box connected to the outer shell, an air inlet is provided at the middle position of the bottom of the air intake box, the air inlet is connected to the air intake pipe through a conical tube, a plurality of air outlet holes are provided on the top circumference of the air intake box, and the air outlet holes are located between the outer shell and the air inlet assembly.

[0010] Further to the above scheme, the air outlet pipe comprises an air outlet box connected to the outer shell and the inner shell, a through hole is provided in the middle of the air outlet box, the bottom of the through hole is connected to the inner shell, and the top of the through hole is connected to the air outlet pipe through the second conical tube.

[0011] Furthermore, with respect to the above scheme, the air inlet assembly includes a rotating bearing arranged in the middle of the air inlet box, the rotating bearing is connected to the air inlet box through a rotating roller, a plurality of air inlets and exhaust ports are circumferentially arranged at the bottom and top of the air inlet box, a connecting bearing and a membrane assembly are connected to the air inlet box and are respectively located on both sides of the exhaust port, a plurality of air inlet blades are circumferentially arranged on the side of the air inlet box, the air inlet blades are located above the air outlet and correspond to the air duct, so that after the air inlet blades receive the wind force entering from the air duct, the air inlet box rotates horizontally and generates negative pressure suction above the air outlet to introduce the exhaust gas into the inner shell.

[0012] Furthermore, with respect to the above scheme, the membrane assembly 1 includes a mounting seat 1 connected to the air inlet box, the mounting seat 1 is located on the inner side of the exhaust port and a plurality of large-aperture hollow fiber membranes are arranged on the circumference of the mounting seat 1, the top ends of the plurality of large-aperture hollow fiber membranes are commonly connected to an air collecting box 1, the air collecting box 1 is connected to the inner shell through a sealing bearing 1 so that the position of the air collecting box 1 is in a closed state to prevent the exhaust gas from going up through the air collecting box 1, allowing the exhaust gas to fully enter the large-aperture hollow fiber membrane, a plurality of air vents are arranged on the circumference of the top of the air collecting box 1, and the membrane assembly 2 is arranged on the air collecting box 1 and is located on the inner side of the air vents.

[0013] Furthermore, with respect to the above scheme, the membrane assembly 2 includes a mounting seat 2 connected to an air collecting box 1, the mounting seat 2 is located on the inner side of the vent hole and a plurality of small-pore hollow fiber membranes are arranged on the circumference of the mounting seat 2, the top ends of the plurality of small-pore hollow fiber membranes are commonly connected to an air collecting box 2, the air collecting box 2 is connected to the inner shell via a sealing bearing 2 so that the position of the air collecting box 2 is in a closed state, preventing the exhaust gas from passing through the air collecting box 2, allowing the exhaust gas to fully enter the small-pore hollow fiber membrane, and a vent is provided in the middle position of the top of the air collecting box 2, and the vent is directly below the outlet pipe.

[0014] Furthermore, with respect to the above scheme, a drainage component is installed on the second air collecting box, and the drainage component is located below the air outlet box, so that when the drainage component rotates, negative pressure is formed above the vent to guide the air flow to the outlet pipe.

[0015] Further to the above scheme, the drainage assembly includes a mounting rod arranged on the second air collecting box, and a drainage paddle is provided on the mounting rod, and the drainage paddle is located between the vent and the outlet pipe.

[0016] Furthermore, with respect to the above scheme, a brush assembly is fixedly installed on the inner wall of the inner shell, so that when the membrane assembly 1 and the membrane assembly 2 rotate, they contact the brush assembly in a stationary state, thereby achieving a cleaning operation on the surface of the membrane assembly 1 and the membrane assembly 2.

[0017] Further to the above scheme, the brush assembly includes two mounting plates arranged on the inner wall of the inner shell, each of the two mounting plates is equipped with a group of bristles, and the two groups of bristles are in contact with the outer surface of the large-pore hollow fiber membrane and the small-pore hollow fiber membrane respectively.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention can improve the waste gas treatment efficiency and accelerate the waste gas treatment by the membrane assembly 1 and the membrane assembly 2 through the coordinated arrangement of the outer shell, the air inlet pipe, the air outlet pipe, the air bleed assembly, the inner shell, the membrane assembly 1 and the membrane assembly 2, while increasing the service life of the membrane assembly 1 and the membrane assembly 2.

[0020] 2. The present invention adopts the combined structural design of the housing, the air inlet pipe and the air outlet pipe, so that the exhaust gas can evenly enter the housing through the air inlet pipe and then be quickly discharged through the air outlet pipe, thereby improving the treatment effect of the exhaust gas.

[0021] 3. The present invention adopts a combined design of an air bleed assembly, an inner shell, a membrane assembly 1 and a membrane assembly 2, so that the exhaust gas can be quickly sucked into the inner shell and then gradient filtered by the membrane assembly 1 and the membrane assembly 2. The air bleed assembly can accelerate the flow efficiency of the exhaust gas entering the inner shell, and can also serve as a power source for the membrane assembly 1 and the membrane assembly 2. In addition, since the membrane assembly 1 and the membrane assembly 2 are designed with gradient membrane pores and rotation, the unique dynamic characteristics of the membrane assembly 1 and the membrane assembly 2 can improve the filtration efficiency and enhance the self-cleaning ability during the exhaust gas treatment process, thereby reducing the degree of contamination of the membrane assembly 1 and the membrane assembly 2 and reducing the risk of clogging.

[0022] 4. The present invention provides a drainage component, which rotates above the vent to form a negative pressure that guides the airflow to the outlet pipe, so that the gas at the vent position can quickly flow to the outlet pipe, thereby improving the discharge efficiency of the treated exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the external structure of the present invention;

[0025] Figure 3 It is a schematic diagram of the installation position of the outer shell and the inner shell;

[0026] Figure 4 The figure is a schematic diagram of the installation position of the air bleed assembly;

[0027] Figure 5 It is a schematic diagram of the installation position of membrane assembly 1 and membrane assembly 2;

[0028] Figure 6 is a schematic diagram of the three-dimensional structure of the air intake box;

[0029] Figure 7 Schematic diagram of the three-dimensional structure of the gas outlet box;

[0030] Figure 8 It is a three-dimensional structural schematic diagram of the air bleed box;

[0031] Fig. 9 This is a schematic diagram of the installation position of the drainage component;

[0032] Fig.10 This is a schematic diagram of the installation position of the brush assembly;

[0033] Among them: 1. Shell; 11. Air duct; 2. Air inlet pipe; 21. Air inlet box; 211. Air inlet; 212. Air outlet; 22. Conical tube 1; 23. Air inlet pipe; 3. Air outlet pipe; 31. Air outlet box; 311. Through hole; 32. Conical tube 2; 33. Air outlet pipe; 4. Air bleed assembly; 41. Rotating bearing; 42. Rotating roller; 43. Air bleed box; 431. Air bleed port; 432. Exhaust port; 44. Air bleed blade; 5. Connecting shaft Bearing; 51, inner shell; 52, sealed bearing one; 53, sealed bearing two; 6, membrane assembly one; 61, mounting seat one; 62, large-pore hollow fiber membrane; 63, gas collecting box one; 631, vent; 7, membrane assembly two; 71, mounting seat two; 72, small-pore hollow fiber membrane; 73, gas collecting box two; 731, vent; 8, drainage assembly; 81, mounting rod; 82, drainage blade; 9, brush assembly; 91, mounting plate; 92, bristles. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention. The present invention is further described in combination with the drawings and embodiments:

[0035] See attached Figure 1 -Attached Figure 5 As shown, a twin-screw extruder exhaust gas filtering mechanism for filling masterbatch processing includes a shell 1, and the two ends of the shell 1 are open and respectively connected to an air inlet pipe 2 and an air outlet pipe 3; wherein, a group of air bleed components 4 located inside the shell 1 are rotatably connected on the air inlet pipe 2, and the air bleed components 4 are correspondingly arranged with an air duct 11 arranged on the side of the shell 1, so that the external wind force blows to the air bleed components 4 through the air duct 11 to make the air bleed components 4 rotate horizontally, and negative pressure suction is generated at the position of the air bleed components 4; the top of the air bleed component 4 is rotatably connected to an inner shell 51 through a connecting bearing 5, and the two ends of the inner shell 51 are It is open and its top end is fixedly connected to the air outlet pipe 3, so that the inner shell 51 remains stationary when the air inlet assembly 4 rotates; a group of membrane assembly 1 6 and membrane assembly 2 7 with a smaller membrane pore size than membrane assembly 1 6 are arranged in sequence from bottom to top in the inner shell 51, and the membrane assembly 1 6 is fixedly connected to the air inlet assembly 4, so that the membrane assembly 1 6 and the membrane assembly 2 7 form a gradient and continuous rotating filter membrane structure in the inner shell 51, and after the exhaust gas enters through the position of the air inlet pipe 2, the negative pressure suction force generated by the position of the air inlet assembly 4 is introduced into the rotating filter membrane structure for treatment, and the filtered exhaust gas is discharged from the air outlet pipe 3.

[0036] In the specific implementation process of the present invention, the air duct 11 is connected to the external fan, so that the wind generated by the fan is blown to the air bleed component 4 through the air duct 11, and the air bleed component 4 is rotated horizontally; when in use, the exhaust gas enters the housing 1 through the air inlet pipe 2, and then is quickly sucked into the rotating filter membrane structure through the negative pressure suction force generated at the position of the air bleed component 4. Due to the special properties of the rotating filter membrane structure in the present invention (rotation, gradient membrane pores), the exhaust gas has the following advantages after entering the rotating filter membrane structure:

[0037] 1. The rotating design of the rotating filter membrane structure allows the membrane surface to be continuously updated, reducing the deposition time of pollutants in the exhaust gas on the membrane surface and reducing the risk of clogging, thereby effectively preventing membrane pollution, extending the replacement cycle of membrane materials and reducing long-term operating costs;

[0038] 2. The rotating design of the rotating filter membrane structure ensures that the waste gas to be treated is more evenly distributed on the entire membrane surface, thereby increasing the effective filtration volume per unit area;

[0039] 3. The rotating action of the rotating filter membrane structure increases the contact opportunity between the target exhaust gas pollutants and the membrane surface, and enhances the separation effect, especially for the removal of tiny particles, volatile organic compounds (VOCs) and other soluble substances;

[0040] 4. The rotating motion of the rotating filter membrane structure increases the gas turbulence, promotes the diffusion of exhaust gas from the mainstream to the membrane surface, and improves the mass transfer rate.

[0041] 5. The gradient membrane pore design of the rotary filter membrane structure has a large membrane pore size of membrane component 1-6 and a relatively small membrane pore size of membrane component 2-7, so that the exhaust gas can be filtered step by step after entering. Membrane component 1-6 serves as the first line of defense and pre-filters to remove dust and oil mist. The subsequent membrane component 2-7 is responsible for adsorbing VOCs (volatile organic compounds) and other trace pollutants, which improves the filtering effect on the exhaust gas, reduces the degree of pollution of membrane components 1-6 and 2-7, reduces the risk of clogging, and extends their replacement cycle.

[0042] In the above embodiment, for the structure of the air intake pipe 2, refer to the attached Figure 3 -Attached Figure 6 As shown, the air intake pipe 2 includes an air intake box 21 connected to the outer shell 1, an air intake port 211 is provided at the middle position of the bottom of the air intake box 21, the air intake port 211 is connected to the air intake pipe 23 through a conical tube 22, and a plurality of air outlet holes 212 are provided on the top circumference of the air intake box 21, and the air outlet holes 212 are located between the outer shell 1 and the air induction component 4.

[0043] During the specific implementation of this scheme, after the exhaust gas enters the conical tube 22 through the intake pipe 23, as the exhaust gas passes through the gradually expanding section of the conical tube 22, it is ensured that the exhaust gas can be quickly and evenly distributed in the air intake box 21, and finally discharged evenly into the outer shell 1 through a plurality of outlet holes 212, thereby improving the adsorption efficiency of the air induction component 4 for the exhaust gas.

[0044] In the above embodiment, for the structure of the outlet pipe 3, refer to the attached Figure 1 and attached Figure 7 As shown, the air outlet pipe 3 includes an air outlet box 31 connected to the outer shell 1 and the inner shell 51. A through hole 311 is provided in the middle of the air outlet box 31. The bottom of the through hole 311 is connected to the inner shell 51, and the top of the through hole 311 is connected to the air outlet pipe 33 through the conical tube 2 32.

[0045] In the specific implementation process of this scheme, the filtered exhaust gas enters the conical pipe 32 from the exhaust box 31. As the exhaust gas passes through the tapered section of the conical pipe 32, efficient gas guidance can be achieved in a limited space, which increases the exhaust speed of the gas, so that the filtered exhaust gas forms a high-speed flow at the exhaust pipe 33, which helps to quickly exhaust the gas and improve the processing efficiency.

[0046] In the above embodiment, for the structure of the air bleed assembly 4, refer to the attached Figure 1 , Attachment Figure 4 , Attachment Figure 5 And attached Figure 8 As shown, the air inlet assembly 4 includes a rotating bearing 41 arranged in the middle of the air inlet box 21, and the rotating bearing 41 is connected to the air inlet box 43 through a rotating roller 42. The bottom and top of the air inlet box 43 are respectively circumferentially arranged with a plurality of air inlets 431 and exhaust ports 432. The connecting bearing 5 and the membrane assembly 6 are connected to the air inlet box 43 and are respectively located on both sides of the exhaust port 432. A plurality of air inlet blades 44 are arranged circumferentially on the side of the air inlet box 43. The air inlet blades 44 are located above the air outlet 212 and correspond to the air duct 11, so that after the air inlet blades 44 receive the wind force entering from the air duct 11, the air inlet box 43 is horizontally rotated and a negative pressure suction force is generated above the air outlet 212 to introduce the exhaust gas into the inner shell 51.

[0047] During the specific implementation of the present scheme, after the air induced blades 44 are affected by the wind force entering from the air duct 11, the air induced box 43 begins to rotate horizontally. During the process, the air induced box 43 and the air induced blades 44 form a rotating paddle structure, and generate negative pressure suction above the air outlet 212, so that the exhaust gas discharged from the air outlet 212 is introduced through the air induced port 431 and then discharged from the exhaust port 432 into the rotating filter membrane structure. Through this structure, not only can the flow efficiency of the exhaust gas entering the rotating filter membrane structure be accelerated, but it can also serve as a power source for the rotating filter membrane structure.

[0048] In the above embodiment, for the structure of the membrane module 6, refer to the attached Figure 1 and attached Figure 5 As shown, the membrane assembly 6 includes a mounting seat 61 connected to the air inlet box 43, the mounting seat 61 is located on the inner side of the exhaust port 432 and a plurality of large-aperture hollow fiber membranes 62 are arranged on the circumference of the mounting seat 61, the top ends of the plurality of large-aperture hollow fiber membranes 62 are commonly connected to an air collecting box 63, the air collecting box 63 is connected to the inner shell 51 through a sealing bearing 52 so that the position of the air collecting box 63 is in a closed state to prevent the exhaust gas from going up through the air collecting box 63, so that the exhaust gas can fully enter the large-aperture hollow fiber membrane 62, a plurality of air vents 631 are arranged on the circumference of the top of the air collecting box 63, and the membrane assembly 27 is arranged on the air collecting box 63 and is located on the inner side of the air vents 631.

[0049] In the specific implementation of this scheme, the exhaust gas discharged through the exhaust port 432 is treated by the rotating large-pore hollow fiber membrane 62. The exhaust gas treated by the large-pore hollow fiber membrane 62 enters the gas collecting box uniformly and is evenly discharged from the vent hole 631.

[0050] In the above embodiment, for the structure of the membrane module 27, refer to the attached Figure 1 and attached Figure 5 As shown, the membrane assembly 2 7 includes a mounting seat 2 71 connected to the air collecting box 1 63, the mounting seat 2 71 is located on the inner side of the vent 631 and a plurality of small-pore hollow fiber membranes 72 are arranged on the circumference of the mounting seat 2 71, the top ends of the plurality of small-pore hollow fiber membranes 72 are commonly connected to the air collecting box 2 73, the air collecting box 2 73 is connected to the inner shell 51 through the sealing bearing 2 53 so that the position of the air collecting box 2 73 is in a closed state to prevent the exhaust gas from going up through the air collecting box 2 73, so that the exhaust gas can fully enter the small-pore hollow fiber membrane 72, and a vent 731 is provided in the middle of the top of the air collecting box 2 73, and the vent 731 is located directly below the outlet pipe 33.

[0051] During the specific implementation of this solution, the exhaust gas discharged through the vent hole 631 is treated by the rotating small-pore hollow fiber membrane 72. The exhaust gas treated by the small-pore hollow fiber membrane 72 enters the gas collecting box and is discharged from the vent hole 731.

[0052] In the above embodiment, in order to improve the exhaust efficiency of the waste gas after being treated by the rotary filter membrane structure, Fig. 9 As shown, a drainage assembly 8 is installed on the air collecting box 73 No. 2, and the drainage assembly 8 is located below the air outlet box 31, so that when the drainage assembly 8 rotates, a negative pressure is formed above the vent 731 to guide the air flow to the outlet pipe 33; specifically, the drainage assembly 8 includes a mounting rod 81 arranged on the air collecting box No. 2 73, and a drainage paddle 82 is provided on the mounting rod 81, and the drainage paddle 82 is located between the vent 731 and the outlet pipe 33.

[0053] During the specific implementation of this solution, when the drainage blade 82 rotates, the low-pressure area formed in the center can effectively inhale the gas, so that the gas at the vent 731 can quickly flow to the outlet pipe 33, thereby accelerating the filtering efficiency.

[0054] In the above embodiment, considering the service life of membrane assembly 1 6 and membrane assembly 2 7, in order to extend the service life of the membrane material and reduce the cleaning frequency and replacement cost, for this purpose, refer to the attached Fig.10 As shown, a brush assembly 9 is fixedly installed on the inner wall of the inner shell 51, so that when the membrane assembly 1 6 and the membrane assembly 2 7 rotate, they contact the brush assembly 9 in a stationary state, thereby realizing the cleaning operation of the surface of the membrane assembly 1 6 and the membrane assembly 2 7; specifically, the brush assembly 9 includes two mounting plates 91 arranged on the inner wall of the inner shell 51, and each of the two mounting plates 91 is installed with a group of bristles 92, and the two groups of bristles 92 are in contact with the outer surface of the large-pore hollow fiber membrane 62 and the small-pore hollow fiber membrane 72 respectively.

[0055] During the specific implementation of this scheme, the rotating large-pore hollow fiber membrane 62 and small-pore hollow fiber membrane 72 are constantly in contact with the bristles 92, which reduces the residual suspended particles on the outer surface of the large-pore hollow fiber membrane 62 and the small-pore hollow fiber membrane 72, reduces the blockage of the membrane pores of the large-pore hollow fiber membrane 62 and the small-pore hollow fiber membrane 72 by exhaust gas pollutants, and thereby improves the use effect.

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A twin-screw extruder exhaust gas filtering mechanism for processing filler masterbatch, comprising a housing (1), wherein both ends of the housing (1) are open and respectively connected with an air inlet pipe (2) and an air outlet pipe (3); the characteristics are: The air inlet pipe (2) is rotatably connected to a group of air inlet components (4) located inside the housing (1). The air inlet components (4) are arranged corresponding to the air duct (11) arranged on the side of the housing (1), so that the external wind blows to the air inlet components (4) through the air duct (11), causing the air inlet components (4) to rotate horizontally and generating negative pressure suction at the position of the air inlet components (4); The top of the air bleed assembly (4) is rotatably connected to an inner shell (51) via a connecting bearing (5); both ends of the inner shell (51) are open and the top end is fixedly connected to the air outlet pipe (3) so that the inner shell (51) remains stationary when the air bleed assembly (4) rotates; A group of membrane components 1 (6) and membrane components 2 (7) having a smaller membrane pore size than the membrane components 1 (6) are sequentially arranged in the inner shell (51) from bottom to top, and the membrane components 1 (6) are fixedly connected to the air inlet components (4) so ​​that the membrane components 1 (6) and the membrane components 2 (7) form a gradient and continuous rotating filter membrane structure in the inner shell (51). After the waste gas enters through the air inlet pipe (2), the negative pressure suction force generated by the air inlet components (4) is introduced into the rotating filter membrane structure for treatment, and the filtered waste gas is discharged from the air outlet pipe (3).

2. The exhaust gas filtration mechanism of a twin-screw extruder for processing a filling masterbatch according to claim 1, characterized in that: The air intake pipe (2) comprises an air intake box (21) connected to the outer shell (1); an air intake port (211) is provided at the middle position of the bottom of the air intake box (21); the air intake port (211) is connected to an air intake pipe (23) via a conical pipe (22); a plurality of air outlet holes (212) are provided on the circumference of the top of the air intake box (21); and the air outlet holes (212) are located between the outer shell (1) and the air induction assembly (4).

3. The exhaust gas filtration mechanism of a twin-screw extruder for processing a filling masterbatch according to claim 2, characterized in that: The air outlet pipe member (3) comprises an air outlet box (31) connected to the outer shell (1) and the inner shell (51); a through hole (311) is provided in the middle of the air outlet box (31); the bottom of the through hole (311) is connected to the inner shell (51); and the top of the through hole (311) is connected to the air outlet pipe (33) via a second conical pipe (32).

4. The exhaust gas filtration mechanism of a twin-screw extruder for processing a filling masterbatch according to claim 3, characterized in that: The air induction assembly (4) comprises a rotating bearing (41) arranged in the middle of the air inlet box (21), the rotating bearing (41) is connected to the air inlet box (43) through a rotating roller (42), the bottom and top of the air inlet box (43) are respectively provided with a plurality of air inlet ports (431) and exhaust ports (432) on the circumference, the connecting bearing (5) and the membrane assembly (6) are connected to the air inlet box (43) and are respectively located on both sides of the exhaust port (432), and a plurality of air induction blades (44) are provided on the circumference of the side of the air inlet box (43), the air induction blades (44) are located above the air outlet (212) and correspond to the air duct (11), so that after the air inlet blades (44) receive the wind force entering from the air duct (11), the air inlet box (43) is rotated horizontally and a negative pressure suction force is generated at a position above the air outlet (212), thereby introducing the exhaust gas into the inner shell (51).

5. The exhaust gas filtration mechanism of a twin-screw extruder for processing a filler masterbatch according to claim 4, characterized in that: The membrane assembly 1 (6) includes a mounting seat 1 (61) connected to the air inlet box (43), the mounting seat 1 (61) is located on the inner side of the exhaust port (432) and a plurality of large-aperture hollow fiber membranes (62) are arranged on the circumference of the mounting seat 1 (61), the top ends of the plurality of large-aperture hollow fiber membranes (62) are connected to an air collecting box 1 (63), the air collecting box 1 (63) is connected to the inner shell (51) through a sealing bearing 1 (52), a plurality of ventilation holes (631) are arranged on the circumference of the top of the air collecting box 1 (63), and the membrane assembly 2 (7) is arranged on the air collecting box 1 (63) and is located on the inner side of the ventilation holes (631).

6. The exhaust gas filtering mechanism of a twin-screw extruder for processing a filling masterbatch according to claim 5, characterized in that: The membrane assembly 2 (7) includes a mounting seat 2 (71) connected to the air collecting box 1 (63); the mounting seat 2 (71) is located inside the vent hole (631) and a plurality of small-pore hollow fiber membranes (72) are arranged on the circumference of the mounting seat 2 (71); the top ends of the plurality of small-pore hollow fiber membranes (72) are connected to the air collecting box 2 (73); the air collecting box 2 (73) is connected to the inner shell (51) through the sealing bearing 2 (53); a vent (731) is arranged in the middle of the top of the air collecting box 2 (73); the vent (731) is located directly below the outlet pipe (33).

7. The exhaust gas filtering mechanism of a twin-screw extruder for processing a filler masterbatch according to claim 6, characterized in that: The second air collecting box (73) is provided with a drainage assembly (8), which is located below the air outlet box (31) so that when the drainage assembly (8) rotates, a negative pressure is formed above the air vent (731) to guide the air flow toward the air outlet pipe (33).

8. The exhaust gas filtering mechanism of a twin-screw extruder for processing a filling masterbatch according to claim 7, characterized in that: The drainage assembly (8) comprises a mounting rod (81) arranged on the second air collecting box (73), a drainage paddle (82) being arranged on the mounting rod (81), and the drainage paddle (82) being located between the vent (731) and the air outlet pipe (33).

9. The exhaust gas filtering mechanism of a twin-screw extruder for processing a filler masterbatch according to claim 8, characterized in that: A brush assembly (9) is fixedly mounted on the inner wall of the inner shell (51) so that the membrane assembly 1 (6) and the membrane assembly 2 (7) contact the stationary brush assembly (9) when they rotate.

10. The exhaust gas filtering mechanism of a twin-screw extruder for processing a filling masterbatch according to claim 9, characterized in that: The brush assembly (9) comprises two mounting plates (91) arranged on the inner wall of the inner shell (51), and each mounting plate (91) is provided with a group of bristles (92), and the two groups of bristles (92) are in contact with the outer surface of the large-pore hollow fiber membrane (62) and the small-pore hollow fiber membrane (72), respectively.

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