Vacuum filtering mechanism of double-screw extruder

Abstract

The utility model relates to the technical field of plastic raw material processing equipment, in particular to a vacuum filtering mechanism of a double-screw extruder, the vacuum filtering mechanism of the double-screw extruder comprises a waste gas collecting assembly, a pipeline assembly, a multi-stage filtering assembly and a vacuumizing assembly, the waste gas collecting assembly is arranged above the pipeline assembly and is communicated with the pipeline assembly, and waste gas can be collected and conveyed; the pipeline assembly is detachably connected with the multi-stage filtering assembly, so that the multi-stage filtering assembly is convenient to replace and clean to maintain the filtering effect; the multi-stage filtering assembly can perform multi-stage filtering on the waste gas, impurities are removed, and water vapor is purified; the vacuumizing assembly is communicated with the multi-stage filtering assembly, so that the suction efficiency is improved, power is provided, and smooth treatment of waste gas is guaranteed; the mechanism is beneficial to improving the waste gas treatment quality, guaranteeing stable operation of equipment, optimizing the production environment and assisting the extruder in efficient and environment-friendly production.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of plastic raw material processing equipment, especially to a vacuum filtering mechanism of double screw extruder. BACKGROUND

[0002] In the field of plastic raw material processing, double screw extruder is a commonly used device widely used, however, in the extrusion operation process, a large amount of gas and volatile matter will be produced, if these substances cannot be discharged in time, it will have a serious impact on the quality of plastic products and processing efficiency; at present, some existing extruders have a series of problems, for example, some existing vacuum filtering mechanisms are difficult to separate the components; the filtering components adopt a single filtering method, the filtering precision is limited, and the impurities in the waste gas cannot be removed well, resulting in high load in the filtering link; and the positioning performance between the components of most existing vacuum filtering mechanisms is not stable, which brings many challenges to plastic raw material processing; therefore, designing an efficient vacuum filtering mechanism to solve the above problems is of great significance to improve the quality of plastic raw material processing. SUMMARY

[0003] The utility model aims at solving one of the technical problems in the prior art.

[0004] The utility model provides a vacuum filtering mechanism of double screw extruder, which comprises: a waste gas collecting component, a pipeline component, a multistage filtering component and a vacuumizing component, the waste gas collecting component is arranged above the pipeline component, and the waste gas collecting component is communicated with the pipeline component; the pipeline component is detachably connected with the multistage filtering component, and the multistage filtering component is located below the pipeline component; the multistage filtering component is communicated with the vacuumizing component; and the vacuumizing component is located beside the multistage filtering component.

[0005] The utility model has the advantages that the waste gas collecting component can effectively collect the waste gas generated by the extruder, and the waste gas can be smoothly transmitted through the communication with the pipeline component; the detachable connection mode of the pipeline component and the multistage filtering component facilitates the replacement and cleaning of the multistage filtering component, so that the filtering effect can be continuously maintained; the multistage filtering component can carry out multistage filtering on the waste gas to remove particulate impurities and water vapor and effectively purify the waste gas; the communication between the vacuumizing component and the multistage filtering component not only improves the efficiency of sucking the waste gas, but also provides sufficient power for the whole filtering process, so that the waste gas can smoothly flow through the components to complete the treatment; in general, the mechanism helps to improve the waste gas treatment quality, ensures the stable operation of the equipment, optimizes the production environment and helps the double screw extruder to realize more efficient and environmentally friendly production.

[0006] The multi-stage filtering assembly comprises a first pipeline module, a waste gas buffer tank and a multi-stage filtering screen, the first pipeline module is in communication with the pipeline assembly, the waste gas buffer tank is in communication with the pipeline assembly, the waste gas buffer tank is in communication with the first pipeline module, and the multi-stage filtering screen is arranged in the waste gas buffer tank. The waste gas buffer tank is in communication with the pipeline assembly and the first pipeline module, thereby providing a buffer space for gas flow, and the multi-stage filtering screen arranged in the waste gas buffer tank can efficiently filter particulate impurities and water vapor in the gas, which helps to reduce damage to the impurity vacuumizing assembly and ensure stable operation of the equipment. Meanwhile, the design structure of these components is reasonable and the communication is good, thereby providing a reliable filtering means for waste gas treatment of the double-screw extruder and promoting more efficient and environmentally-friendly plastic raw material processing.

[0007] Further, the vacuumizing assembly comprises an air extraction pipe and a vacuum pump, the air extraction pipe is arranged below the multi-stage filtering screen, one end of the air extraction pipe is connected with the waste gas buffer tank, and the other end of the air extraction pipe is connected with the vacuum pump, and the vacuum pump is used for extracting waste gas in the waste gas buffer tank. The air extraction pipe is arranged below the multi-stage filtering screen, thereby effectively reducing damage of particulate impurities in the gas to the air extraction pipe and the vacuum pump and prolonging the service life of the vacuum pump. The waste gas buffer tank can buffer the waste gas, prevent overloading of the vacuum pump, avoid reduction of air extraction efficiency, and the vacuum pump can efficiently extract the waste gas in the waste gas buffer tank, thereby providing power for the entire filtering process. These components ensure that the waste gas can be smoothly extracted after multi-stage filtering, improve waste gas treatment efficiency, and provide a strong guarantee for stable operation of the double-screw extruder and high-quality plastic raw material processing.

[0008] Further, the first pipeline module comprises a first communication pipeline, a buffer pipeline and a second communication pipeline, the first communication pipeline is in communication with the waste gas buffer tank, one end of the buffer pipeline with a larger inner diameter is connected with the first communication pipeline, the other end of the buffer pipeline with a smaller inner diameter is in communication with the second communication pipeline, and the second communication pipeline is connected with the pipeline assembly. When the gas flow enters the buffer pipeline with a larger inner diameter from the end with a smaller inner diameter, the waste gas flow rate is reduced and the pressure is effectively buffered. Meanwhile, the buffer pipeline can temporarily accommodate excess waste gas, thereby providing a buffer space for the entire vacuum filtering mechanism, which helps to stabilize the waste gas transmission process and improve the operation stability of the entire multi-stage filtering assembly, thereby providing reliable pipeline transmission guarantee for waste gas treatment of the double-screw extruder and promoting efficient plastic raw material processing.

[0009] Further, the pipeline assembly comprises a third connecting pipeline, one end of the third connecting pipeline is connected with the exhaust gas collecting assembly, and the other end of the third connecting pipeline is detachably connected with the second connecting pipeline. The third connecting pipeline is connected with the exhaust gas collecting assembly and is detachably connected with the second connecting pipeline, which facilitates flexible replacement or cleaning of the detached components when needed, improving the maintainability of the entire vacuum filtering mechanism; at the same time, the detachable connection also facilitates the cleaning of impurities inside the second connecting pipeline and the third connecting pipeline, preventing the accumulation of impurities from affecting the exhaust gas transmission efficiency, ensuring the smoothness of the pipeline, providing a reliable pipeline connection solution for the exhaust gas treatment of the double-screw extruder, and promoting the efficient processing of plastic raw materials.

[0010] Further, the pipeline assembly further comprises a clamp, the clamp is arranged on the third connecting pipeline, and the clamp is used for clamping and positioning the connecting position of the third connecting pipeline and the second connecting pipeline. The clamp is arranged on the third connecting pipeline, which can quickly clamp and separate the third connecting pipeline and the second connecting pipeline, improving the efficiency of connection and disconnection, and facilitating maintenance and repair operations; the clamp can provide uniform clamping force, ensuring reliable connection and preventing exhaust gas leakage; the clamp has a compact structure and occupies a small space, and the clamp connection can be repeatedly disconnected and clamped, increasing the flexibility and durability of the connection, and providing a reliable and convenient solution for the pipeline connection of the double-screw extruder.

[0011] Further, a valve is arranged between the first connecting pipeline and the buffer pipeline, and the valve is used for controlling the flow of exhaust gas from the buffer pipeline to the first connecting pipeline. When it is necessary to replace the multi-stage filtering assembly, the valve can be closed to block the flow of exhaust gas from the pipeline assembly to the multi-stage filtering assembly, effectively preventing exhaust gas leakage and avoiding the safety risks and environmental pollution problems caused thereby; secondly, after the valve is closed, maintenance personnel do not need to worry about the interference of exhaust gas when replacing the multi-stage filtering assembly, making the replacement process more safe and convenient and improving the maintenance efficiency; thirdly, the valve 5 can also control the opening degree, thereby adjusting the flow of exhaust gas from the buffer pipeline to the multi-stage filtering assembly, realizing precise control of the exhaust gas flow, ensuring stable operation of the entire system under different working conditions, providing a reliable flow control means for the exhaust gas treatment of the double-screw extruder, and helping to improve the quality and environmental protection of plastic raw material processing.

[0012] Further, the vacuumizing assembly further comprises a vacuum gauge, which is arranged on the air exhaust pipe and used for measuring the vacuum degree of the vacuum filtering mechanism.

[0013] Further, the multi-stage filter screen comprises a first filter screen, a second filter screen and a third filter screen, which are arranged in a longitudinal array on the waste gas buffer tank in sequence.

[0014] Further, the waste gas collecting assembly comprises a waste gas collecting tank and a gas feeding pipe, the waste gas collecting tank is connected with the third communication pipeline, and the waste gas collecting tank is arranged above the third communication pipeline; the gas feeding pipe is connected with the waste gas collecting tank, and the gas feeding pipe is arranged on the waste gas collecting tank; the waste gas buffer tank comprises a buffer tank body and an openable cover, the openable cover is connected with the first communication pipeline, the openable cover is connected with the buffer tank body in an openable mode, and the openable cover is arranged above the buffer tank body.

[0015] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and / or additional aspects and advantages of the present utility model will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the references to the following drawings of which:

[0017] Fig. 1 It is a partial perspective view of the vacuum filtering mechanism of the double screw extruder of the present utility model;

[0018] Fig. 2 It is a partial structure schematic view of the multi-stage filtering assembly 2 in the vacuum filtering mechanism of the double screw extruder of the present utility model.

[0019] In the drawings: 1-waste gas collection assembly; 11-waste gas collection tank; 12-gas feeding pipe; 2-pipeline assembly; 21-third communication pipeline; 22-clamp; 3-multi-stage filtering assembly; 31-first pipeline module; 311-first communication pipeline; 312-buffer pipeline; 313-second communication pipeline; 32-waste gas buffer tank; 321-buffer tank body; 322-opening and closing cover; 33-multi-stage filtering screen; 331-first filtering screen; 332-second filtering screen; 333-third filtering screen; 4-vacuum pumping assembly; 41-exhaust pipe; 42-vacuum pump; 43-vacuum gauge; 5-valve. DETAILED DESCRIPTION

[0020] The embodiments of the present utility model will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout.

[0021] As Figs. 1-2 shown, a vacuum filtering mechanism of a double screw extruder, comprising: waste gas collection assembly 1, pipeline assembly 2, multi-stage filtering assembly 3 and vacuum pumping assembly 4, the waste gas collection assembly 1 is arranged above the pipeline assembly 2, the waste gas collection assembly 1 is communicated with the pipeline assembly 2;

[0022] In the present embodiment, the waste gas collection assembly can effectively collect the waste gas generated by the double screw extruder, the pipeline assembly 2 is communicated with the waste gas collection assembly 1, ensuring that the waste gas is smoothly transmitted from the pipeline assembly 2 to the waste gas collection assembly 1,

[0023] The pipeline assembly 2 is detachably connected with the multi-stage filtering assembly 3, and the multi-stage filtering assembly 3 is located below the pipeline assembly 2;

[0024] The pipeline assembly 2 and the multi-stage filtering assembly 3 are detachably connected, which facilitates the replacement or cleaning of the multi-stage filtering assembly 3 after a period of use, ensuring the persistence of the filtering effect;

[0025] The multi-stage filtering assembly 3 is in communication with the vacuum pumping assembly 4; the vacuum pumping assembly 4 is located beside the multi-stage filtering assembly 3.

[0026] The multi-stage filtering assembly 3 can perform multi-stage filtering on the exhaust gas to remove particulate impurities and water vapor in the exhaust gas; the vacuum pumping assembly 4 is in communication with the multi-stage filtering assembly 3, which can improve the efficiency of the vacuum pumping assembly 4 in pumping the exhaust gas and provide power for the entire filtering process, ensuring that the exhaust gas can smoothly pass through each component for treatment.

[0027] In this embodiment, the exhaust gas collecting assembly 1 can effectively collect the exhaust gas generated by the extruder and ensure smooth transmission of the exhaust gas through communication with the pipeline assembly 2; the detachable connection of the pipeline assembly 2 and the multi-stage filtering assembly 3 facilitates subsequent replacement and cleaning of the multi-stage filtering assembly 3, allowing the filtering effect to be continuously maintained; the multi-stage filtering assembly 3 can perform multi-stage filtering on the exhaust gas to remove particulate impurities and water vapor, effectively purifying the exhaust gas; and the vacuum pumping assembly 4 is in communication with the multi-stage filtering assembly 3, which not only improves the efficiency of pumping the exhaust gas but also provides sufficient power for the entire filtering process, ensuring that the exhaust gas can smoothly flow through each component for treatment. Overall, this mechanism helps improve the quality of exhaust gas treatment, ensures stable operation of the equipment, optimizes the production environment, and helps the twin-screw extruder achieve more efficient and environmentally friendly production.

[0028] The multi-stage filtering assembly 3 includes a first pipeline module 31, an exhaust gas buffer tank 32, and a multi-stage filtering screen 33; the first pipeline module 31 is in communication with the pipeline assembly 2; the exhaust gas buffer tank 32 is in communication with the pipeline assembly 2; the exhaust gas buffer tank 32 is connected to the first pipeline module 31; and the multi-stage filtering screen 33 is arranged inside the exhaust gas buffer tank 32.

[0029] In this embodiment, the exhaust gas buffer tank 32 is in communication with the pipeline assembly 2 and the first pipeline module 31, providing a buffer space for gas flow; the multi-stage filtering screen 33 arranged inside the exhaust gas buffer tank 32 can efficiently filter particulate impurities and water vapor in the gas, which helps reduce damage to the impurity vacuum pumping assembly 4 and ensures stable operation of the equipment; at the same time, the design structure of these components is reasonable, and the communication is good, providing a reliable filtering means for the exhaust gas treatment of the twin-screw extruder and promoting more efficient and environmentally friendly processing of plastic raw materials.

[0030] The vacuum pumping assembly 4 includes an air suction pipe 41 and a vacuum pump 42; the air suction pipe 41 is arranged below the multi-stage filtering screen 33; one end of the air suction pipe 41 is connected to the exhaust gas buffer tank 32; the other end of the air suction pipe 41 is connected to the vacuum pump 42; and the vacuum pump 42 is used to extract the exhaust gas in the exhaust gas buffer tank 32.

[0031] In the embodiment, the suction pipe 41 is arranged below the multi-stage filter screen 33, which can effectively reduce the damage of the particulate impurities in the gas to the suction pipe 41 and the vacuum pump 42, prolong the service life of the vacuum pump 42; the waste gas buffer tank 32 can buffer the waste gas, prevent the vacuum pump 42 from overloading, avoid the decrease of the suction efficiency, and the vacuum pump 42 can efficiently extract the waste gas in the waste gas buffer tank 32, which provides power for the whole filtering process; these components ensure that the waste gas can be smoothly filtered and extracted in time after multi-stage filtering, improve the waste gas treatment efficiency, and provide a strong guarantee for the stable operation of the double-screw extruder and the high quality of the plastic raw material processing.

[0032] The first pipeline module 31 comprises a first communication pipeline 311, a buffer pipeline 312 and a second communication pipeline 313, the first communication pipeline 311 is in communication with the waste gas buffer tank 32;

[0033] In the embodiment, the waste gas flows from the second communication pipeline 313 to the buffer pipeline 312, and then flows to the first communication pipeline 311;

[0034] The end of the buffer pipeline 312 with a larger inner diameter is connected with the first communication pipeline 311;

[0035] The end of the buffer pipeline 312 with a smaller inner diameter is in communication with the second communication pipeline 313;

[0036] The second communication pipeline 313 is connected with the pipeline assembly 2.

[0037] In the embodiment, when the gas flow enters the buffer pipeline 312 with a larger inner diameter from the end with a smaller inner diameter, the waste gas flow rate is reduced, and the pressure is effectively buffered; at the same time, the buffer pipeline 312 can temporarily accommodate excess waste gas, which provides a buffer space for the whole vacuum filtering mechanism, which helps to stabilize the waste gas transmission process and improve the operation stability of the whole multi-stage filtering assembly, provides reliable pipeline transmission guarantee for the waste gas treatment of the double-screw extruder, and promotes the efficient processing of the plastic raw material.

[0038] The pipeline assembly 2 comprises a third communication pipeline 21, one end of the third communication pipeline 21 is connected with the waste gas collection assembly 1, and the other end of the third communication pipeline 21 is detachably connected with the second communication pipeline 313.

[0039] In the embodiment, the third communication pipeline 21 is connected with the exhaust gas collecting assembly 1 and is detachably connected with the second communication pipeline 313. This design facilitates flexible replacement or cleaning of the detached components when needed, thereby improving the maintainability of the entire vacuum filtering mechanism. Meanwhile, the detachable connection facilitates the cleaning of impurities inside the second communication pipeline 313 and the third communication pipeline 21, prevents the impurities from affecting the exhaust gas transmission efficiency, ensures the smoothness of the pipelines, provides a reliable pipeline connection scheme for the exhaust gas treatment of the double-screw extruder, and promotes the efficient processing of plastic raw materials.

[0040] The pipeline assembly 2 further comprises a clamp 22 provided on the third communication pipeline 21, which is used to clamp and position the communication part of the third communication pipeline 21 and the second communication pipeline 313.

[0041] In the embodiment, the clamp 22 is provided on the third communication pipeline 21 and can quickly clamp and separate the third communication pipeline 21 and the second communication pipeline 313, thereby improving the efficiency of connection and disconnection and facilitating maintenance and repair operations. The clamp 22 can provide uniform clamping force to ensure reliable connection and prevent exhaust gas leakage. The clamp 22 has a compact structure and occupies a small space. Moreover, the use of the clamp 22 for connection allows multiple disconnection and clamping operations, thereby increasing the flexibility and durability of the connection and providing a reliable and convenient solution for the pipeline connection of the double-screw extruder.

[0042] A valve 5 is provided between the first communication pipeline 311 and the buffer pipeline 312, which is used to control the flow of exhaust gas from the buffer pipeline 312 to the first communication pipeline 311.

[0043] In the embodiment, when the multi-stage filter assembly 3 needs to be replaced, the valve 5 can be closed to block the flow of exhaust gas from the pipeline assembly 2 to the multi-stage filter assembly 3, thereby effectively preventing exhaust gas leakage and avoiding the resulting safety risks and environmental pollution problems. Secondly, after the valve 5 is closed, maintenance personnel do not need to worry about the interference of exhaust gas when replacing the multi-stage filter assembly 3, making the replacement process safer and more convenient and improving the maintenance efficiency. Furthermore, the valve 5 can control the opening degree to adjust the flow of exhaust gas from the buffer pipeline 312 to the multi-stage filter assembly 3, thereby achieving precise control of the exhaust gas flow and ensuring the stable operation of the entire system under different working conditions. This provides a reliable flow control means for the exhaust gas treatment of the double-screw extruder and helps to improve the quality and environmental friendliness of plastic raw material processing.

[0044] The vacuum pumping assembly 4 further comprises a vacuum gauge 43 provided on the air suction pipe 41, which is used to measure the vacuum degree of the vacuum filtering mechanism.

[0045] In the embodiment, the vacuum gauge 43 is arranged on the exhaust pipe 41, and can accurately measure the vacuum degree of the vacuum filtering mechanism. Through the vacuum degree data obtained by measurement, the operator can intuitively judge whether the exhaust gas in the vacuum filtering mechanism is completely removed, which helps to timely adjust the working state of the vacuum assembly 4, ensures that the exhaust gas is fully extracted, improves the exhaust gas treatment effect, and at the same time, provides a reliable monitoring means for stable operation of the equipment and processing quality of the plastic raw material, makes the whole production process more controllable, and guarantees the efficiency and environmental protection of the production.

[0046] The multi-stage filter screen 33 includes a first filter screen 331, a second filter screen 332, and a third filter screen 333, which are installed in sequence in a longitudinal array on the exhaust gas buffer tank 32.

[0047] In the embodiment, the first filter screen 331, the second filter screen 332, and the third filter screen 333 are installed in sequence in a longitudinal array on the exhaust gas buffer tank 32, and different filter screens can be used for graded filtration of particles or impurities of different sizes; the first filter screen 331 intercepts larger particles, the second filter screen 332 filters medium-sized particles, and the third filter screen 333 removes smaller particles and water vapor, greatly improving the filtration effect; this graded filtration method ensures that the exhaust gas is fully purified, providing a purer gas environment for subsequent processes, and helps to improve the processing quality of plastic raw materials and the stability of equipment operation.

[0048] The exhaust gas collecting assembly 1 includes an exhaust gas collecting tank 11 and a gas feeding pipe 12, the exhaust gas collecting tank 11 is in communication with the third communication pipe 21, and the exhaust gas collecting tank 11 is arranged above the third communication pipe 21; the gas feeding pipe 12 is in communication with the exhaust gas collecting tank 11, and the gas feeding pipe 12 is arranged on the exhaust gas collecting tank 11; the gas feeding pipe 12 above can introduce exhaust gas, and after the exhaust gas enters the exhaust gas collecting tank 11, the space becomes larger and the flow rate decreases, realizing temporary buffering of the exhaust gas; the exhaust gas buffer tank 32 includes a buffer tank body 321 and an open-close cover 322, the open-close cover 322 is in communication with the first communication pipe 311, the open-close cover 322 is in open-close connection with the buffer tank body 321, and the open-close cover 322 is arranged above the buffer tank body 321; the open-close connection facilitates opening of the open-close cover 322, thereby facilitating removal of the multi-stage filter screen 33 for cleaning or replacement.

[0049] In the embodiment, the exhaust gas collecting tank 11 introduces exhaust gas through the gas feeding pipe 12, and after the exhaust gas enters, the space is enlarged and the flow rate is reduced, realizing temporary buffering of the exhaust gas and helping to stabilize the exhaust gas transmission; the opening and closing cover 322 of the exhaust gas buffering tank 32 is connected with the buffering tank body 321 in an opening and closing mode, so that the multi-stage filter screen 33 can be taken out after being opened to clean or replace it, and the convenience of maintenance is improved, the stability and continuity of the exhaust gas treatment are guaranteed, a reliable scheme is provided for the exhaust gas treatment of the double-screw extruder, the quality and efficiency of the plastic raw material processing are improved, and the maintenance cost is reduced.

[0050] The embodiments described below with reference to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as a limitation on the utility model.

[0051] In the description of the utility model, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as a limitation on the utility model.

[0052] The utility model is within the scope defined by the inventive claim.

Claims

1. A vacuum filtering mechanism of a twin-screw extruder, characterized by: The exhaust gas collecting assembly (1), the pipeline assembly (2), the multi-stage filtering assembly (3) and the vacuum pumping assembly (4) are connected in sequence. The pipeline assembly (2) is detachably connected with the multi-stage filtering assembly (3), and the multi-stage filtering assembly (3) is located below the pipeline assembly (2). The multi-stage filtering assembly (3) is in communication with the vacuum pumping assembly (4), and the vacuum pumping assembly (4) is located beside the multi-stage filtering assembly (3). The multi-stage filtering assembly (3) comprises a first pipeline module (31), an exhaust gas buffer tank (32) and a multi-stage filtering screen (33), the first pipeline module (31) is in communication with the pipeline assembly (2), the exhaust gas buffer tank (32) is in communication with the pipeline assembly (2), the exhaust gas buffer tank (32) is in communication with the first pipeline module (31), and the multi-stage filtering screen (33) is arranged in the exhaust gas buffer tank (32). The vacuum pumping assembly (4) comprises an air extraction pipe (41) and a vacuum pump (42), the air extraction pipe (41) is arranged below the multi-stage filtering screen (33), one end of the air extraction pipe (41) is connected with the exhaust gas buffer tank (32), the other end of the air extraction pipe (41) is connected with the vacuum pump (42), and the vacuum pump (42) is used for extracting exhaust gas in the exhaust gas buffer tank (32).

2. A vacuum filter mechanism for a twin-screw extruder as claimed in claim 1, characterized in that The first pipeline module (31) comprises a first communication pipeline (311), a buffer pipeline (312) and a second communication pipeline (313), the first communication pipeline (311) is in communication with the exhaust gas buffer tank (32).

3. A vacuum filter mechanism for a twin-screw extruder as claimed in claim 2, wherein One end of the buffer pipeline (312) with a larger inner diameter is connected with the first communication pipeline (311). The other end of the buffer pipeline (312) with a smaller inner diameter is in communication with the second communication pipeline (313). The second communication pipeline (313) is connected with the pipeline assembly (2). The pipeline assembly (2) comprises a third communication pipeline (21), one end of the third communication pipeline (21) is connected with the exhaust gas collecting assembly (1), and the other end of the third communication pipeline (21) is detachably connected with the second communication pipeline (313).

4. A vacuum filter mechanism for a twin-screw extruder as claimed in claim 3, wherein The pipeline assembly (2) further comprises a clamp (22), the clamp (22) is arranged on the third communication pipeline (21), and the clamp (22) is used for clamping and positioning the communication position of the third communication pipeline (21) and the second communication pipeline (313).

5. A vacuum filter mechanism for a twin-screw extruder as claimed in claim 4, wherein A valve (5) is arranged between the first communication pipeline (311) and the buffer pipeline (312), and the valve (5) is used for controlling the flow of exhaust gas from the buffer pipeline (312) to the first communication pipeline (311).

6. A vacuum filter mechanism for a twin-screw extruder as claimed in claim 5, wherein The vacuum pumping assembly (4) further comprises a vacuum gauge (43), the vacuum gauge (43) is arranged on the air extraction pipe (41), and the vacuum gauge (43) is used for measuring the vacuum degree of the vacuum filtering mechanism.

7. A vacuum filter mechanism for a twin-screw extruder as claimed in claim 6, wherein ​ 8. A vacuum filter mechanism for a twin-screw extruder as claimed in claim 1, wherein, The multi-stage filter screen (33) comprises a first filter screen (331), a second filter screen (332) and a third filter screen (333), which are sequentially installed on the waste gas buffer tank (32) in a longitudinal array.

9. A vacuum filtering mechanism for a twin-screw extruder as claimed in claim 4, wherein, The waste gas collecting assembly (1) comprises a waste gas collecting tank (11) and a gas feeding pipe (12), the waste gas collecting tank (11) is communicated with the third communicating pipe (21), and the waste gas collecting tank (11) is arranged above the third communicating pipe (21); the gas feeding pipe (12) is communicated with the waste gas collecting tank (11), and the gas feeding pipe (12) is arranged on the waste gas collecting tank (11); the waste gas buffer tank (32) comprises a buffer tank body (321) and an opening and closing cover (322), the opening and closing cover (322) is communicated with the first communicating pipe (311), the opening and closing cover (322) is in opening and closing connection with the buffer tank body (321), and the opening and closing cover (322) is arranged above the buffer tank body (321).

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