Extrusion stability testing equipment for screw extruder

Abstract

The invention discloses equipment for testing the extrusion stability of a screw extruder, and belongs to the technical field of extruder testing equipment.The equipment comprises a testing machine barrel section, a flow guide block and a melt pressure sensor are installed on the top and the side wall of the testing machine barrel section respectively, a testing base plate is installed on the flow guide block, and a compensation corrugated pipe is arranged on the testing base plate; the compensation corrugated pipe is provided with a test pipe, and the test pipe is provided with a treatment discharge pipe. The device can replace an exhaust cylinder section of an original organic cylinder group, utilizes waste gas in an extrusion process, realizes real-time testing of material stability on the premise of not interrupting production, and realizes real-time testing of material stability through combined action of the front-end gas pressure sensor, the sintering filter layer, the rear-end gas pressure sensor and the gas concentration sensor. When the melt pressure fluctuation and the gas concentration abnormity occur at the same time, the instability type can be distinguished, and the monitored waste gas can be subjected to safe combustion treatment by arranging the treatment discharge pipe.

Description

Technical Field

[0001] This invention relates to the field of extruder testing equipment technology, and more particularly to a screw extruder extrusion stability testing device. Background Technology

[0002] A screw extruder is a polymer processing equipment. The extrusion stability of the screw extruder determines the product quality. Therefore, when trying to produce with a new formula, it is necessary to conduct an extrusion stability test first and adjust the parameters of the barrel assembly and screw accordingly. Extrusion stability is mainly manifested in the fluctuation of melt pressure, the uniformity of temperature field, and the continuity of material flow in the barrel. The existing test method is to install melt pressure sensor and temperature sensor on the barrel and indirectly judge whether the extrusion is stable by monitoring the fluctuation amplitude and frequency of melt pressure. However, pressure fluctuations are only one manifestation of extrusion instability. Many factors affecting stability, such as residual moisture in the material, undischarged volatiles, and gases produced by thermal decomposition, are actually reflected in the composition and concentration of gases escaping from the exhaust port in the venting extrusion process. These changes actually contain important information reflecting the material state and the stability of the extrusion process. When the extrusion process is stable, the gas release rate is uniform and the composition is relatively stable. When extrusion fluctuates (such as abnormal temperature, shear overheating, or feeding fluctuations), gas release often exhibits pulse-like release or abrupt changes in composition. This information cannot be captured by pressure sensors, making it impossible for existing extrusion stability testing equipment to test the material stability during the extrusion process. To address these issues, a screw extruder extrusion stability testing device is proposed. Summary of the Invention

[0003] The purpose of this invention is to solve the problem that existing extruder testing equipment cannot test the material stability during the extrusion process, and to propose a screw extruder extrusion stability testing device.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A screw extruder extrusion stability testing device includes a test barrel section, which is installed on the extruder body and replaces the exhaust pipe section of the original barrel assembly. It is used for online monitoring of the material state during the extrusion process. The test barrel section has mounting grooves on its top and side walls. A guide block is installed on the mounting groove at the top of the test barrel section, and an exhaust port is eccentrically positioned on the top of the guide block. A melt pressure sensor is installed on the mounting groove on the side wall of the test barrel section. A test base plate is installed on the guide block. The test base plate has an air inlet, an adjusting push cylinder, and a control box. A compensating bellows is installed on the air inlet, and a test tube is installed on the compensating bellows. A rear-end pressure sensor and a gas concentration sensor are located on the outer side wall of the test tube, and a treatment and discharge pipe is installed on the test tube. The air inlet and exhaust outlet on the test substrate are aligned, and four limiting slide bars are arranged around the air inlet on the surface of the test substrate. The bottom of the compensating bellows is provided with an extension section, and the outer side wall of the extension section is provided with a front-end air pressure sensor. The outer side wall of the top of the compensating bellows is provided with four sliding fixing ears and one mounting fixing ear. The sliding fixing ears are slidably connected to the limiting slide rod, and the mounting fixing ear is fixedly connected to the piston rod of the adjusting push cylinder.

[0005] Preferably, the bottom of the guide block is provided with an arc-shaped block that matches the internal flow channel in the extruder body, and the bottom of the arc-shaped block is provided with a guide surface for guiding the exhaust gas to the exhaust port.

[0006] Preferably, a heat insulation pad is provided under the test substrate to prevent heat conduction.

[0007] Preferably, a sintered filter layer is installed at the bottom of the test tube. The sintered filter layer is located below the rear pressure sensor and the gas concentration sensor, and is used to filter non-gaseous impurities in the exhaust gas to prevent non-gaseous impurities from interfering with the gas concentration sensor in capturing characteristic gases.

[0008] Preferably, the compensating bellows is used to compensate for the change in airflow resistance caused by contamination of the sintered filter layer. The initial height of the compensating bellows is the same as two-thirds of the distance from the top of the limiting slide bar to the surface of the test substrate, which is used to provide the distance required for the expansion and contraction of the compensating bellows.

[0009] Preferably, the pressure sensor, the front pressure sensor, the rear pressure sensor, and the adjusting push cylinder are all electrically connected to the control box. The front pressure sensor and the rear pressure sensor constitute a differential pressure monitoring component. The control box controls the action of the adjusting push cylinder and adjusts the length of the compensating bellows by using compensation control logic based on the data from the front pressure sensor and the rear pressure sensor.

[0010] Preferably, the compensation control logic specifically comprises: when At that time, it was determined that the degree of filter layer contamination had affected the stability of gas sampling, and based on... Offset calculation compensation height This allows for the control and adjustment of the push cylinder to drive the compensation bellows to rise and fall, thereby compensating for the downstream sampling flow rate by changing the internal volume of the compensation bellows and offsetting the fluctuations in sampling flow rate caused by changes in the resistance of the sintered filter layer. in, For real-time differential pressure, , This is the reading from the front-end barometric pressure sensor. For the readings of the back-end barometric pressure sensor, As the reference pressure difference, This is the differential pressure compensation threshold.

[0011] Preferably, the compensation height It is positively correlated with the differential pressure offset, specifically: in This is a preset proportionality coefficient, the value of which is determined through experimental calibration based on gas flow rate, pipe diameter, and filter layer characteristics.

[0012] Preferably, an annular corrugated flame-retardant plate is installed at the bottom of the inner wall of the treatment and emission pipe to prevent the exhaust gas in the test pipe from burning due to backfire. A pulse igniter for igniting the exhaust gas is provided on the inner wall of the top of the treatment and emission pipe, and a windproof cover is installed on the top of the treatment and emission pipe to improve combustion stability.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention can replace the exhaust pipe section of the original extrusion cylinder assembly and utilize the waste gas in the extrusion process to achieve real-time testing of material stability without interrupting production.

[0014] 2. This invention utilizes the combined action of a front-end pressure sensor, a sintering filter layer, a rear-end pressure sensor, and a gas concentration sensor to distinguish the type of instability when melt pressure fluctuations and abnormal gas concentrations occur simultaneously: if the pressure difference remains constant and HCl rises slightly, it indicates an increase in physical gas production; if the pressure difference increases and HCl rises significantly, it indicates chemical decomposition; if the pressure difference remains constant and HCl continues to rise, it indicates thermal decomposition caused by process overload, thus providing accurate fault type judgment for process adjustment.

[0015] 3. By setting up a treatment and discharge pipe, the present invention can safely burn the monitored waste gas. The corrugated flame-retardant plate effectively prevents the spread of backfire, and the windproof cover ensures stable combustion of the flame under the interference of external airflow, avoiding the safety hazards of direct open flame emission and improving the safety and environmental protection of the equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a screw extruder extrusion stability testing device proposed in this invention under operating conditions; Figure 2 This is a schematic diagram of the overall structure of a screw extruder extrusion stability testing device proposed in this invention; Figure 3 This is an overall structural assembly diagram of a screw extruder extrusion stability testing device proposed in this invention; Figure 4 This is a schematic diagram of the bottom structure of the guide block in a screw extruder extrusion stability testing device proposed in this invention; Figure 5 This is a schematic diagram of the structure of the test substrate in the screw extruder extrusion stability testing equipment proposed in this invention; Figure 6 This is a structural assembly diagram of the compensating bellows, test tube, and treatment and discharge tube in a screw extruder extrusion stability testing device proposed in this invention; Figure 7 This is a cross-sectional view of the compensating bellows in a screw extruder extrusion stability testing device proposed in this invention; Figure 8 This is a cross-sectional view of the test tube in a screw extruder extrusion stability testing device proposed in this invention; Figure 9 This is a cross-sectional view of the treatment and discharge pipe in a screw extruder extrusion stability testing device proposed in this invention; Figure 10 This is a front view of the test substrate, compensation bellows, test tube, and treatment discharge tube in a screw extruder extrusion stability testing device proposed in this invention. Figure 11 This is a schematic diagram of the back structure of the test substrate, compensating bellows, test tube, and treatment discharge tube in a screw extruder extrusion stability testing device proposed in this invention.

[0017] In the diagram: 1. Test chamber section; 2. Guide block; 201. Arc block; 202. Guide curved surface; 3. Exhaust port; 4. Fusion pressure sensor; 5. Test substrate; 6. Air inlet; 7. Adjustment push cylinder; 8. Control box; 9. Compensating bellows; 10. Test tube; 11. Rear end pressure sensor; 12. Gas concentration sensor; 13. Treatment and discharge pipe; 14. Limiting slide bar; 15. Front end pressure sensor; 16. Sliding fixing ear; 17. Mounting fixing ear; 18. Heat insulation gasket; 19. Sintered filter layer; 20. Corrugated flame retardant plate; 21. Pulse igniter; 22. Windproof cover. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Example, refer to Figures 1 to 11 A screw extruder extrusion stability testing device includes a test barrel section 1, which is installed on the extruder body and replaces the exhaust pipe section of the original barrel assembly. It is used to monitor the material state during the extrusion process online. The test barrel section 1 has mounting grooves on its top and side walls. A guide block 2 is installed on the mounting groove on the top of the test barrel section 1. An exhaust port 3 is eccentrically set on the top of the guide block 2. A melt pressure sensor 4 is installed on the mounting groove on the side wall of the test barrel section 1. A test base plate 5 is installed on the guide block 2. The test base plate 5 is provided with an air inlet 6, an adjusting push cylinder 7 and a control box 8. A compensation bellows 9 is provided on the air inlet 6. A test tube 10 is installed on the compensation bellows 9. A rear-end pressure sensor 11 and a gas concentration sensor 12 are provided on the outer side wall of the test tube 10. A treatment and discharge pipe 13 is installed on the test tube 10. The air inlet 6 on the test substrate 5 is aligned with the exhaust outlet 3, and four limiting slide bars 14 are provided around the air inlet 6 on the surface of the test substrate 5. The bottom of the compensating bellows 9 is provided with an extension section, and the outer wall of the extension section is provided with a front-end air pressure sensor 15. The outer wall of the top of the compensating bellows 9 is provided with four sliding fixing ears 16 and one mounting fixing ear 17. The sliding fixing ears 16 are slidably connected to the limiting slide rod 14, and the mounting fixing ear 17 is fixedly connected to the piston rod of the adjusting push cylinder 7.

[0022] Furthermore, the bottom of the guide block 2 is provided with an arc-shaped block 201 that matches the internal flow channel in the extruder body. The bottom of the arc-shaped block 201 is provided with a guide curved surface 202, which guides the volatile gas in the extrusion section to the eccentrically set exhaust port 3 without interfering with the normal material conveying, thereby giving the test substrate 5 a larger installation space. Furthermore, a heat insulation pad 18 is provided below the test substrate 5 to prevent heat conduction and prevent the high temperature of the barrel from being conducted to the test substrate 5 and the sensors on it, so as to prevent thermal interference from affecting the accuracy of the sensors. Furthermore, a sintered filter layer 19 is installed at the bottom of the test tube 10. The sintered filter layer 19 is located below the rear pressure sensor 11 and the gas concentration sensor 12, and is used to filter non-gaseous impurities such as oligomers and dust in the exhaust gas. The further advantage of adopting the above is that the sintered filter layer 19 not only ensures the accuracy of gas concentration measurement and avoids impurities contaminating the sensor, which may lead to misjudgment or failure, but it is also a prerequisite for realizing the pressure difference detection between the front-end pressure sensor 15 and the back-end pressure sensor 11. The sintered filter layer 19 will form a stable airflow resistance, so that a measurable pressure difference can be generated between the front and back ends. Thus, the degree of contamination of the sintered filter layer 19 and the material stability during the extrusion process can be judged by the pressure difference change.

[0023] Furthermore, the compensating bellows 9 is used to compensate for the change in airflow resistance caused by contamination of the sintered filter layer 19. The initial height of the compensating bellows 9 is the same as two-thirds of the distance from the top of the limiting slide bar 14 to the surface of the test substrate 5, which is used to provide the distance required for the expansion and contraction of the compensating bellows 9. The further advantage of adopting the above is that by setting the initial height, the compensating bellows 9 can be ensured to have sufficient extension and contraction stroke, enabling it to dynamically adjust its internal volume according to the degree of contamination of the sintered filter layer 19, actively compensate for changes in airflow resistance, and maintain sampling stability.

[0024] Furthermore, the pressure sensor 4, the front pressure sensor 15, the rear pressure sensor 11, and the adjusting push cylinder 7 are all electrically connected to the control box 8. The front pressure sensor 15 and the rear pressure sensor 11 constitute a differential pressure monitoring component. Based on the data from the front pressure sensor 15 and the rear pressure sensor 11, the control box 8 controls the action of the adjusting push cylinder 7 through compensation control logic to adjust the length of the compensation bellows 9. The further advantage of using the above is that it combines the front-end air pressure Pressure difference The data on the concentration of characteristic gas (HCl) can be used to distinguish different operating conditions of the extruder during the extrusion process, such as physical gas generation, chemical decomposition, and process overload, by detecting the exhaust gas, thus realizing the function of testing the stability of materials during the extrusion process.

[0025] Furthermore, the compensation control logic is specifically as follows: when At that time, it was determined that the degree of filter layer contamination had affected the stability of gas sampling, and based on... Offset calculation compensation height This allows the control and adjustment of the push cylinder 7 to drive the compensation bellows 9 to rise and fall, thereby compensating for the downstream sampling flow rate by changing the internal volume of the compensation bellows 9 and offsetting the fluctuation in sampling flow rate caused by the change in resistance of the sintered filter layer 19. in, For real-time differential pressure, , For the reading of the front-end barometric pressure sensor 15, For the reading of the back-end barometric pressure sensor 11, As the reference pressure difference, This is the differential pressure compensation threshold; Compensation height It is positively correlated with the differential pressure offset, specifically: in This is a preset proportionality coefficient, the value of which is determined through experimental calibration based on gas flow rate, pipe diameter, and filter layer characteristics. The further advantage of adopting the above is that by dynamically changing the internal volume of the compensating bellows 9, the changes in airflow resistance caused by contamination of the sintered filter layer 19 can be actively compensated, the downstream sampling flow rate can be kept constant, and the distortion of air pressure and concentration measurement caused by flow fluctuations can be avoided. At the same time, the replacement frequency of the sintered filter layer 19 is reduced, the maintenance cycle is extended, and the long-term operational stability of the equipment is improved.

[0026] It should be noted that: based on the readings of the front-end barometric pressure sensor 15 Pressure difference The changes in the readings (HCl concentration) of gas concentration sensor 12 can be used to diagnose the operating conditions reflecting the stability of the material during extrusion. These operating conditions are as follows: rise, Unchanged, HCl concentration normal or slightly increased: This condition indicates an increase in physical gas production, which means that the material carries more air and volatiles. If the HCl concentration only slightly increases, it means that the heat accumulation is still within a controllable range. It is necessary to pay attention to whether it is close to the decomposition threshold. Fluctuations or gradual increases Gradually increasing, HCl concentration significantly increasing: This operating condition is due to chemical decomposition producing gas, accompanied by quality deterioration. A sharp rise in HCl is the core warning signal. rise, Unchanged, HCl concentration continues to rise: This condition indicates that the extruder's output rate per unit time has exceeded the safe tolerance under the current process conditions, and heat accumulation has been triggered, causing the material to begin to decompose. The diagnostic logic described above will not be repeated below.

[0027] Furthermore, an annular corrugated flame-retardant plate 20 is installed at the bottom of the inner wall of the treatment and emission pipe 13 to prevent the exhaust gas in the test pipe 10 from burning due to backfire. A pulse igniter 21 for igniting the exhaust gas is provided on the inner wall of the top of the treatment and emission pipe 13. A windproof cover 22 is installed on the top of the treatment and emission pipe 13 to improve combustion stability. The further advantages of adopting the above are that the corrugated flame retardant plate 20 can block backfire and prevent the spread of combustion; the pulse igniter 21 can achieve the harmless treatment of exhaust gas by igniting the exhaust gas; and the windproof cover 22 can prevent external airflow from interfering with the combustion stability, so that the flame can burn stably even under airflow interference, avoid burns to staff by open flame or ignition of surrounding flammable materials, and improve the safety and reliability of the testing process.

[0028] When using this invention, the test cylinder section 1 is first installed as a replacement module at the exhaust cylinder section of the extruder body, so that the arc-shaped block 201 at the bottom of the guide block 2 is precisely matched with the internal flow channel of the extruder. After the extruder is started, the volatile gas released by the material during the plasticizing and conveying process is guided to the eccentrically set exhaust port 3 through the guide curved surface 202, and enters the compensation bellows 9 through the air inlet 6 on the test substrate 5.

[0029] After the gas enters the compensation bellows 9, it first passes through the front pressure sensor 15 on the outside of the extension section for pressure detection, and then enters the sintered filter layer 19 at the bottom of the test tube 10 to filter out non-gaseous impurities such as oligomers and dust. The purified gas continues to rise and is monitored in real time by the back-end pressure sensor 11 and gas concentration sensor 12 to achieve characteristic gas analysis of the material state. Throughout the gas sampling process, the control box 8 collects the difference data between the front-end and back-end gas pressures in real time. When the sintered filter layer 19 gradually becomes contaminated, causing the pressure difference to deviate beyond the set threshold, the control box 8 drives the adjustment of the push cylinder 7 based on the built-in compensation logic, which in turn drives the compensation bellows 9 to rise and fall along the limit slide bar 14. By changing the internal volume of the compensation bellows 9, the sampling flow fluctuation is dynamically compensated to ensure that the back-end sensor always works under stable airflow conditions.

[0030] Meanwhile, the control box 8 integrates multi-dimensional data such as front-end air pressure, pressure difference and HCl concentration to identify the working conditions during the extrusion process, distinguish between physical gas generation, chemical decomposition or process overload, and issue a warning signal in time when decomposition risk occurs. After monitoring, the exhaust gas enters the treatment and discharge pipe 13, the corrugated flame retardant plate 20 prevents backfire, the pulse igniter 21 ignites the combustible components to achieve harmless treatment, and the wind shield 22 ensures stable flame combustion, ultimately achieving safe emission. The entire equipment enables online monitoring of material stability during continuous extrusion, providing reliable data support for adjusting process parameters to ensure the extrusion stability of the screw extruder.

[0031] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A screw extruder extrusion stability testing device, comprising a test barrel section (1), wherein the test barrel section (1) is installed on the extruder body, replacing the exhaust pipe section of the original barrel assembly, and is used for online monitoring of the material state during the extrusion process, characterized in that, The top and side walls of the test chamber section (1) are provided with mounting grooves. A guide block (2) is installed on the mounting groove at the top of the test chamber section (1). An exhaust port (3) is eccentrically provided on the top of the guide block (2). A fusion pressure sensor (4) is installed on the mounting groove on the side wall of the test chamber section (1). A test base plate (5) is installed on the guide block (2). An air inlet (6), an adjusting push cylinder (7) and a control box (8) are provided on the test base plate (5). A compensation bellows (9) is provided on the air inlet (6). A test tube (10) is installed on the compensation bellows (9). A rear-end pressure sensor (11) and a gas concentration sensor (12) are provided on the outer side wall of the test tube (10). A treatment and discharge pipe (13) is installed on the test tube (10). The air inlet (6) on the test substrate (5) is aligned with the exhaust outlet (3), and four limiting slide bars (14) are provided around the air inlet (6) on the surface of the test substrate (5). The bottom of the compensation bellows (9) is provided with an extension section, and the outer wall of the extension section is provided with a front-end air pressure sensor (15). The outer wall of the top of the compensation bellows (9) is provided with four sliding fixing ears (16) and one mounting fixing ear (17). The sliding fixing ears (16) are slidably connected to the limiting slide rod (14), and the mounting fixing ear (17) is fixedly connected to the piston rod of the adjusting push cylinder (7).

2. The screw extruder extrusion stability testing equipment according to claim 1, characterized in that, The bottom of the guide block (2) is provided with an arc-shaped block (201) that matches the internal flow channel in the extruder body. The bottom of the arc-shaped block (201) is provided with a guide surface (202) for guiding the exhaust gas to the exhaust port (3).

3. The screw extruder extrusion stability testing equipment according to claim 1, characterized in that, A heat insulation pad (18) is provided under the test substrate (5) to prevent heat conduction.

4. The screw extruder extrusion stability testing equipment according to claim 1, characterized in that, The bottom of the test tube (10) is equipped with a sintered filter layer (19), which is located below the rear pressure sensor (11) and the gas concentration sensor (12). The sintered filter layer (19) is used to filter non-gaseous impurities in the exhaust gas and prevent non-gaseous impurities from interfering with the gas concentration sensor (12) in capturing characteristic gases.

5. The screw extruder extrusion stability testing device according to claim 4, characterized in that, The compensation bellows (9) is used to compensate for the change in airflow resistance caused by contamination of the sintered filter layer (19). The initial height of the compensation bellows (9) is the same as two-thirds of the distance from the top of the limiting slide bar (14) to the surface of the test substrate (5), and is used to provide the distance required for the expansion and contraction of the compensation bellows (9).

6. The screw extruder extrusion stability testing device according to claim 1, characterized in that, The pressure sensor (4), the front pressure sensor (15), the rear pressure sensor (11) and the adjusting push cylinder (7) are all electrically connected to the control box (8). The front pressure sensor (15) and the rear pressure sensor (11) constitute a differential pressure monitoring component. The control box (8) controls the action of the adjusting push cylinder (7) through compensation control logic based on the data from the front pressure sensor (15) and the rear pressure sensor (11) to adjust the length of the compensation bellows (9).

7. The screw extruder extrusion stability testing device according to claim 1, characterized in that, The compensation control logic is specifically as follows: when At that time, it was determined that the degree of filter layer contamination had affected the stability of gas sampling, and based on... Offset calculation compensation height Then, the regulating cylinder (7) drives the compensation bellows (9) to rise and fall, and the internal volume of the compensation bellows (9) is changed to compensate the downstream sampling flow rate and offset the sampling flow rate fluctuation caused by the change in resistance of the sintered filter layer (19). in, For real-time differential pressure, , For the reading of the front-end barometric pressure sensor (15), For the reading of the back-end pressure sensor (11), As the reference pressure difference, This is the differential pressure compensation threshold.

8. The screw extruder extrusion stability testing device according to claim 7, characterized in that, The compensation height It is positively correlated with the differential pressure offset, specifically: in This is a preset proportionality coefficient, the value of which is determined through experimental calibration based on gas flow rate, pipe diameter, and filter layer characteristics.

9. The screw extruder extrusion stability testing device according to claim 1, characterized in that, The bottom of the inner wall of the treatment and discharge pipe (13) is equipped with an annular corrugated flame retardant plate (20) to prevent the exhaust gas in the test tube (10) from burning due to backfire. The inner wall of the top of the treatment and discharge pipe (13) is provided with a pulse igniter (21) for igniting the exhaust gas. The top of the treatment and discharge pipe (13) is equipped with a windproof cover (22) to improve combustion stability.

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