Device for testing oxygen index in high gas flow rate state

Abstract

The invention relates to the technical field of combustion performance testing, and discloses a device for oxygen index testing in a high gas flow rate state, which comprises an outer shell, a lower shell is arranged on the inner bottom wall of the outer shell, an upper shell is attached to the top surface of the lower shell, a top cover is arranged on the top surface of the upper shell, an exhaust pipe is embedded in the top cover, and the exhaust pipe is provided with a gas outlet. A first support is installed on the outer wall of the upper shell, a motor is installed on the first support, a gear is fixedly arranged at the output end of the motor, the tooth end of the gear is connected with a gear ring in a meshed mode, the gear ring is embedded into the upper shell and rotationally connected with the upper shell, and a first scraper is fixedly connected to the inner wall of the curved surface of the gear ring. The lower shell and the upper shell are made of high-temperature-resistant glass materials, the combustion condition can be clearly observed in the testing process, the motor is started to drive the first scraping plate to rotate on the inner wall of the upper shell through cooperation of the gear and the gear ring, attached dust can be effectively scraped, the dust is prevented from blocking the sight line, and the observation effect is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of combustion performance testing, in particular to a device for performing oxygen index testing under a high gas flow rate state. Background Art

[0002] The oxygen index test device is used to determine the combustion performance of various textiles including woven, knitted, and non-woven fabrics. It can also be used to determine the combustion performance of plastics, rubber, paper, etc.

[0003] After searching, Chinese patent publication number CN202421157U discloses an oxygen index tester, comprising a glass combustion tube, an igniter disposed on the upper portion of the glass combustion tube, a sample clamp for fixing the test sample and a metal mesh for shielding combustion drippings disposed inside the glass combustion tube, the glass combustion tube being fixed to a control box via a base, the glass combustion tube also being connected to an oxygen source and a nitrogen source via a flow control system, and a display and switch disposed on the control box. This utility model can meet the testing requirements for the combustion properties of various polymer materials; the igniter of the tester has a small diameter and thick walls, which not only reduces the diameter of the outlet flame and prevents the edges and corners next to the top of the test sample from being ignited during ignition, thereby improving the accuracy of the test data, but also extends the service life of the igniter.

[0004] However, in actual use, the combustion of materials will produce various impurities such as smoke, particulate matter, etc. These impurities can easily adhere to the inside of the test device under the action of gas flow, especially the inner wall of the upper shell. With long-term repetition, the dust attached to the inner wall of the upper shell will gradually increase, seriously blocking the operator's line of sight, making it difficult for the operator to clearly observe the specific conditions of the material combustion, such as the shape of the flame, the burning speed, and whether there are any abnormal phenomena. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a device for performing oxygen index testing under high gas flow rate conditions, which solves the problem that various impurities such as smoke, particulate matter, etc. will be generated due to material combustion. With long-term repetition, the dust attached to the inner wall of the upper shell will gradually increase, seriously blocking the operator's vision.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A device for performing oxygen index testing under high gas flow rate conditions, comprising an outer shell, the inner bottom wall of the outer shell is provided with a lower shell, the top surface of the lower shell is adhered to the upper shell, the top surface of the upper shell is provided with a top cover, the top cover is embedded with an exhaust pipe, the outer wall of the upper shell is installed with a bracket 1, the bracket 1 is installed with a motor, the output end of the motor is fixedly provided with a gear, the tooth end of the gear is meshed with a gear ring, the gear ring is embedded in the interior of the upper shell and is rotatably connected to the upper shell, the curved inner wall of the gear ring is fixedly connected with a scraper 1, the outer wall of the scraper 1 slides in contact with the inner wall of the upper shell, and the outer wall of the lower shell is provided with a sealing assembly.

[0007] Through the above scheme: the device for performing oxygen index testing under high gas flow rate conditions has many beneficial effects. It drives the gear and the gear ring to rotate through the motor, so that the scraper rotates inside the upper shell, which can effectively scrape off the dust attached to the inner wall of the upper shell, prevent the dust from blocking the line of sight, and ensure the clarity of the test observation; the motor uses an adjustable speed motor, and with the help of the rotation of the scraper, it can further simulate a more complex combustion environment, thereby improving the reliability of the oxygen index test.

[0008] Preferably, the sealing assembly includes a sleeve, the curved inner wall of the sleeve is fixedly connected to the outer wall of the lower shell, a sealing gasket is provided inside the sleeve, and the upper shell can be inserted into the interior of the sleeve.

[0009] Preferably, a porous sieve plate is installed inside the lower shell, the outer wall of scraper one is rotatably connected to scraper two, scraper two is connected to a limiting pin, a limiting hole is opened inside the scraper one, the outer wall of the limiting pin is slidably connected to the inside of the limiting hole, and the bottom surface of scraper two is slidably connected to the upper surface of the porous sieve plate.

[0010] Preferably, a screw is fixedly connected to the upper surface of the porous sieve plate, and a sample holder is threadedly connected to the outer wall of the screw.

[0011] Preferably, a C-shaped frame is installed inside the sample rack, a threaded rod passes through the inside of the C-shaped frame and is threadedly connected to the threaded rod, and one end of the threaded rod is fixedly connected to a clamping block.

[0012] Preferably, a spiral guide plate and a partition are installed inside the lower shell, the partition is located on the lower side of the porous sieve plate, and the spiral guide plate is located on the lower side of the partition.

[0013] Preferably, the interior of the lower shell is penetrated by an air intake pipe 1 and an air intake pipe 2, and both the air intake pipe 1 and the air intake pipe 2 are connected to a solenoid valve and a gas flow meter, and the gas flow meter is closer to the lower shell than the solenoid valve.

[0014] Preferably, an electric push rod is provided on the upper surface of the top cover, the output end of the electric push rod is fixedly connected to a sliding frame, the sliding frame is fixedly connected to an insulation tube, the outer wall of the insulation tube passes through the top cover and is slidably connected to the top cover, and an igniter is provided on the bottom surface of the insulation tube.

[0015] Preferably, a thermometer is provided inside the outer shell, the thermometer is fitted with the upper shell, a bracket 2 is provided on the outer wall of the upper shell, an infrared thermal imaging camera is installed on the bracket 2, a photosensor is installed on the upper shell, a gas concentration probe is installed inside the lower shell, and the gas concentration probe is located between the porous sieve plate and the partition.

[0016] Preferably, it also includes a control system, which includes a PLC controller and a host computer, and the host computer software is a human-computer interaction interface developed based on Python.

[0017] Working principle: When installing the device and preparing the sample, first insert the upper shell into the outer wall sleeve of the lower shell, seal it with a sealing gasket, and add a snap to complete the shell assembly if necessary. Then rotate the sample holder to adjust the height, place the sample on the C-shaped frame, and rotate the threaded rod to drive the clamping block to fix the sample. In the gas supply, mixing and ignition links, oxygen and nitrogen are introduced through the intake pipe 1 and the intake pipe 2, and the input ratio is adjusted with a gas flow meter and a solenoid valve. The gas is mixed in the static mixing chamber through the spiral guide vane, discharged from the partition outlet, and then discharged upward through the porous sieve plate. After that, the electric push rod is started to drive the insulation tube to slide, so that the igniter is close to the sample for ignition; Starting the motor drives the gears and ring gears, which in turn rotate scraper blade 1. If necessary, scraper blade 2 rotates in contact with the porous sieve plate to remove debris and simulate a complex environment. Simultaneously, a thermometer measures the upper shell temperature, an infrared thermal imaging camera records images, a photosensor records combustion behavior, and a gas concentration probe provides feedback on oxygen consumption. The collected sensor data is transmitted to the control system, where the host computer software automatically calculates the oxygen index, determines the flame retardancy level, and generates a standardized report. The device is cleaned on a daily basis and thoroughly. For daily cleaning, the motor starts to rotate scraper blade 1, scraping away dust from the inner wall of the upper shell. For thorough cleaning, the upper shell is removed and the interior of the device is thoroughly cleaned.

[0018] The present invention provides a device for testing oxygen index under high gas flow rate conditions. It has the following beneficial effects: 1. The present invention adopts high-temperature resistant glass material for the lower shell and the upper shell, which facilitates clear observation of the combustion conditions during the test. The starting motor drives the scraper 1 to rotate on the inner wall of the upper shell through the cooperation of the gear and the gear ring, which can effectively scrape off the attached dust, avoid dust blocking the line of sight, and ensure the observation effect; further, the present invention can choose to drive the scraper 1 to rotate through an adjustable speed motor, which can cause air flow, and then can simulate a more complex combustion environment, meet the test requirements under high gas flow rate conditions, and improve the accuracy and comprehensiveness of the test.

[0019] 2. The present invention can also drive the scraper plate 2 to rotate on the upper surface of the porous screen plate when the scraper plate 1 rotates, so as to peel off debris and prevent the porous screen plate from being blocked.

[0020] 3. The sample holder of the present invention is connected to the porous sieve plate through a screw rod, and the height can be flexibly adjusted to accommodate different samples; the C-shaped frame cooperates with the threaded rod and the clamping block to firmly fix the sample and ensure the test stability.

[0021] 4. The present invention uses a high-flow rate uniform mixed gas supply to realistically restore complex working conditions and improve the accuracy of material flame retardant performance evaluation. The upper shell temperature is detected by a thermometer, the infrared thermal imaging camera records the combustion image, multiple groups of photosensors synchronously record the combustion behavior, and the gas concentration probe provides real-time feedback on oxygen consumption; the control system uploads the sensor data to the host computer, the software automatically calculates the oxygen index, determines the material flame retardant grade, and generates a standardized report, providing a scientific basis for material flame retardant performance evaluation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the partial structure of the gear of the present invention; Figure 3 This is a schematic diagram of a partial structure of a scraper according to the present invention; Figure 4 This is a schematic diagram of the partial structure of the scraper 2 of the present invention; Figure 5 It is a schematic diagram of the local structure of the screw rod of the present invention; Figure 6 It is a schematic diagram of the local structure of the spiral guide vane of the present invention; Figure 7 It is a schematic diagram of the local structure of the thermal insulation pipe of the present invention; Figure 8 It is a schematic diagram of the local structure of the photosensor of the present invention.

[0023] Among them, 1. outer shell; 2. lower shell; 3. upper shell; 4. top cover; 5. bracket 1; 6. motor; 7. gear; 8. gear ring; 9. scraper 1; 10. sleeve; 11. porous sieve plate; 12. scraper 2; 13. limit pin; 14. limit hole; 15. screw; 16. sample rack; 17. C-type rack; 18. threaded rod; 19. clamping block; 20. spiral guide vane; 21. partition; 22. intake pipe 1; 23. intake pipe 2; 24. solenoid valve; 25. gas flow meter; 26. thermometer; 27. photosensor; 28. bracket 2; 29. ​​infrared thermal imaging camera; 30. exhaust pipe; 31. electric push rod; 32. sliding rack; 33. insulation tube; 34. igniter; 35. gas concentration probe. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Please see the attached Figure 1 -Attached Figure 4 An embodiment of the present invention provides a device for performing an oxygen index test under a high gas flow rate state, comprising a shell 1, a lower shell 2 being provided on the inner bottom wall of the shell 1, an upper shell 3 being attached to the top surface of the lower shell 2, a top cover 4 being provided on the top surface of the upper shell 3, an exhaust pipe 30 being embedded in the top cover 4, a bracket 5 being installed on the outer wall of the upper shell 3, a motor 6 being installed on the bracket 5, a gear 7 being fixedly provided on the output end of the motor 6, a gear end of the gear 7 being meshed and connected with a gear ring 8, the gear ring 8 being embedded in the interior of the upper shell 3 and rotatably connected to the upper shell 3, a scraper 9 being fixedly connected to the curved inner wall of the gear ring 8, the outer wall of the scraper 9 being attached to the inner wall of the upper shell 3 and sliding, and a sealing assembly being provided on the outer wall of the lower shell 2.

[0026] Specifically, the lower shell 2 and the upper shell 3 can be separated and assembled. The lower shell 2 and the upper shell 3 are both made of high-temperature resistant glass. The upper shell 3 fixes the bracket 5. The upper shell 3 and the bracket 5 can be disassembled through a clamp. The bracket 5 fixes the motor 6. The starting motor 6 drives the gear 7 to rotate. The gear 7 drives the gear ring 8 to rotate. The gear ring 8 rotates inside the upper shell 3. The gear ring 8 drives the scraper 9 to rotate inside the upper shell 3. The rotation of the scraper 9 can scrape off the dust attached to the inner wall of the upper shell 3 to prevent the dust from blocking the line of sight. When burning, the starting motor 6 drives the scraper 9 Rotation, when the scraper 9 rotates, it will cause air flow, and the motor 6 can choose an adjustable speed motor. By rotating the scraper 9, you can further choose to simulate a more complex combustion environment. It needs to be explained that this solution may have sealing problems due to the need for rotation. Existing technologies can be used to improve the sealing effect, such as through a tortuous gap maze channel between the rotating part and the fixed part, using the gas throttling effect to reduce leakage, and metal gaskets. In addition, in order to prevent parts from deforming at high temperature, materials such as high-temperature alloys are used, and the mechanical parts of this solution do not bear too much torque.

[0027] Please see the attached Figure 2 The sealing assembly includes a sleeve 10 , the curved inner wall of the sleeve 10 is fixedly connected to the outer wall of the lower shell 2 , a sealing gasket is provided inside the sleeve 10 , and the upper shell 3 can be inserted into the interior of the sleeve 10 .

[0028] Specifically, a sleeve 10 is provided on the outer wall of the lower shell 2. When the upper shell 3 is installed, the upper shell 3 is inserted into the sleeve 10. A sealing gasket is provided inside the sleeve 10. The sealing gasket contacts the upper shell 3, which can further ensure the sealing effect. When the device needs to be thoroughly cleaned, the upper shell 3 can be removed upward. Furthermore, a snap-on design can be added to prevent the lower shell 2 and the upper shell 3 from falling off. This belongs to the existing technology and will not be described in detail.

[0029] Please see the attached Figure 2 -Attached Figure 4 A porous sieve plate 11 is installed inside the lower shell 2, and the outer wall of scraper 1 9 is rotatably connected to scraper 2 12, scraper 2 12 is connected to a limit pin 13, and a limit hole 14 is opened inside scraper 1 9. The outer wall of the limit pin 13 is slidably connected to the inside of the limit hole 14, and the bottom surface of scraper 2 12 is slidably connected to the upper surface of the porous sieve plate 11.

[0030] Specifically, the gas enters the upper shell 3 through the porous sieve plate 11. When part of the material burns, ash or fluid may cover the porous sieve plate 11, causing the porous sieve plate 11 to be blocked. The scraper 2 12 can be rotated to fit the porous sieve plate 11. At this time, the rotation of scraper 19 drives the rotation of scraper 2 12. The scraper 2 12 rotates on the upper surface of the porous sieve plate 11, and can peel off the debris attached to the upper surface of the porous sieve plate 11. When the scraper 2 12 is not needed, the scraper 2 12 can be rotated and erected. A limiting hole 14 is opened inside the scraper 19, and the relative positions of the scraper 19 and the scraper 2 12 can be fixed by the cooperation of the limiting pin 13 and the limiting hole 14.

[0031] Please see the attached Figure 5 A screw rod 15 is fixedly connected to the upper surface of the porous sieve plate 11 , and a sample holder 16 is threadedly connected to the outer wall of the screw rod 15 .

[0032] Specifically, a screw rod 15 is provided on the upper surface of the porous sieve plate 11 , and the screw rod 15 is threadedly connected to the sample holder 16 . The screw rod 15 is fixed, and when the sample holder 16 is rotated, the height of the sample holder 16 can be adjusted, thereby changing the position of the sample.

[0033] Please see the attached Figure 5 A C-shaped frame 17 is installed inside the sample rack 16 , a threaded rod 18 is passed through the inside of the C-shaped frame 17 and is threadedly connected to the threaded rod 18 , and one end of the threaded rod 18 is fixedly connected to a clamping block 19 .

[0034] Specifically, the sample is placed on the C-shaped frame 17 , and the threaded rod 18 is rotated to slide, and the threaded rod 18 drives the clamping block 19 to cooperate with the C-shaped frame 17 to fix the sample.

[0035] Please see the attached Figure 6 A spiral guide plate 20 and a partition plate 21 are installed inside the lower shell 2. The partition plate 21 is located on the lower side of the porous sieve plate 11, and the spiral guide plate 20 is located on the lower side of the partition plate 21.

[0036] Specifically, the inner bottom wall of the lower shell 2 and the partition 21 form a static mixing chamber, in which spiral guide vanes 20 are provided. Multiple groups of spiral guide vanes 20 can be provided, and multiple groups of spiral guide vanes 20 can be provided in reverse. An outlet is opened inside the partition 21. The gas is mixed by the spiral guide vanes 20 and discharged from the outlet of the partition 21, and then discharged upward from the porous sieve plate 11.

[0037] Please see the attached Figure 6 The interior of the lower shell 2 is penetrated by an air intake pipe 1 22 and an air intake pipe 2 23 . Both the air intake pipe 1 22 and the air intake pipe 2 23 are connected to a solenoid valve 24 and a gas flow meter 25 . The gas flow meter 25 is closer to the lower shell 2 than the solenoid valve 24 .

[0038] Specifically, an air intake pipe 1 22 and an air intake pipe 2 23 are provided inside the lower shell 2. The air intake pipe 1 22 and the air intake pipe 2 23 respectively introduce oxygen and nitrogen, and dynamically adjust the input ratio of oxygen and nitrogen through the gas flow meter 25 and the solenoid valve 24. The solenoid valve 24 controls the flow rate range from conventional to high speed.

[0039] Please see the attached Figure 1 and attached Figure 7 An electric push rod 31 is provided on the upper surface of the top cover 4, and the output end of the electric push rod 31 is fixedly connected to a sliding frame 32, and the sliding frame 32 is fixedly connected to an insulation tube 33. The outer wall of the insulation tube 33 passes through the top cover 4 and is slidably connected to the top cover 4. An igniter 34 is provided on the bottom surface of the insulation tube 33.

[0040] Specifically, when the sample needs to be ignited, the electric push rod 31 can be started first to drive the sliding frame 32 at the output end to slide, and the sliding frame 32 drives the insulation tube 33 to slide. The insulation tube 33 expands and contracts inside the upper shell 3, thereby driving the igniter 34 close to the sample. The insulation tube 33 is hollow inside, and an electric wire can be introduced to ensure that the igniter 34 ignites normally.

[0041] Please see the attached Figure 1 , Attachment Figure 2 , Attachment Figure 7 , Attachment Figure 8 A thermometer 26 is provided inside the outer shell 1, and the thermometer 26 is fitted with the upper shell 3. A bracket 28 is provided on the outer wall of the upper shell 3, and an infrared thermal imaging camera 29 is installed on the bracket 28. A photosensor 27 is installed on the upper shell 3, and a gas concentration probe 35 is installed inside the lower shell 2. The gas concentration probe 35 is located between the porous sieve plate 11 and the partition 21.

[0042] Specifically, the thermometer 26 is attached to the upper shell 3 to detect the temperature of the upper shell 3. Multiple groups of photosensors 27 can be set at different heights. The infrared thermal imaging camera 29 and the photosensor 27 synchronously record the combustion behavior. The gas concentration probe 35 provides real-time feedback on the oxygen consumption.

[0043] It also includes a control system, which includes a PLC controller and a host computer. The host computer software is based on a human-computer interaction interface developed in Python.

[0044] Specifically, the PLC controller triggers the ignition device to ignite the sample, and the PLC controller uploads the sensor data to the host computer. The software automatically calculates the oxygen index, determines the flame retardant level of the material, and generates a standardized report containing information such as the combustion curve and critical oxygen concentration.

[0045] In this embodiment, a device for performing oxygen index testing under high gas flow conditions is described. First, the operator assembles the lower shell 2 and upper shell 3, inserts the upper shell 3 into the outer sleeve 10 of the lower shell 2, and uses the sealing gasket inside the sleeve 10 to achieve a good seal to prevent gas leakage during the test. The sample is then installed. The porous sieve plate 11 is installed inside the lower shell 2. The screw rod 15 fixed to its upper surface is threadedly connected to the sample holder 16. By rotating the sample holder 16, its height can be flexibly adjusted to meet the testing requirements of different samples. The sample is placed on the C-shaped frame 17 inside the sample holder 16. The threaded rod 18 is rotated, driving the clamping block 19 to cooperate with the C-shaped frame 17 to firmly secure the sample, fully preparing for the subsequent oxygen index test. After the sample is installed, the gas supply system is activated. Inlet pipes 1 22 and 23, which run through the interior of the lower shell 2, introduce oxygen and nitrogen, respectively. The gas flowmeter 25 and solenoid valve 24 connected to the inlet pipes dynamically adjust the oxygen and nitrogen input ratio to ensure the required gas environment for the test. After the gas enters the lower shell 2, it is fully mixed by the spiral guide vane 20 in the static mixing chamber formed by the inner bottom wall of the lower shell 2 and the partition 21. It is then discharged from the outlet of the partition 21 and evenly discharged upward through the porous sieve plate 11. At this time, the electric push rod 31 installed on the upper surface of the top cover 4 is activated. Its output end drives the sliding frame 32 to move, thereby causing the insulation tube 33 to slide on the top cover 4. The hollow interior of the insulation tube 33 allows for the introduction of electrical wires to ensure the normal operation of the igniter 34. When it is necessary to ignite the sample, the electric push rod 31 drives the igniter 34 close to the sample for ignition, officially starting the oxygen index test. The starting motor 6 drives the gear 7 to rotate, and the gear 7 drives the gear ring 8 to rotate inside the upper shell 3, thereby causing the scraper 1 9 to rotate inside the upper shell 3. The scraper 2 12 connected to the outer wall of the scraper 1 9 can be fitted with the porous sieve plate 11 when needed. The rotation of the scraper 1 9 drives the scraper 2 12 to rotate on the upper surface of the porous sieve plate 11, peeling off the debris attached to the upper surface of the porous sieve plate 11 to avoid clogging. During combustion, a more complex combustion environment can be simulated. During the test, the thermometer 26 set inside the outer shell 1 is fitted with the upper shell 3 to detect its temperature; the infrared thermal imaging camera 29 installed on the bracket 2 28 on the outer wall of the upper shell 3 records the combustion image in real time; multiple groups of light-sensitive sensors 27 at different heights installed on the upper shell 3 synchronously record the combustion behavior; the gas concentration probe 35 installed between the porous sieve plate 11 and the partition 21 inside the lower shell 2 provides real-time feedback on oxygen consumption, providing an accurate basis for subsequent data processing; The collected data is transmitted to a control system consisting of a PLC controller and a host computer. The host computer software uses a human-computer interface developed in Python. After the PLC controller triggers the ignition device to ignite the sample, the sensor data is uploaded to the host computer. The software automatically processes the collected data, calculates the oxygen index, determines the material's flame retardancy level, and generates a standardized report containing information such as the combustion curve and critical oxygen concentration, providing a scientific basis for evaluating the material's flame retardancy. During the test, if dust adheres to the inner wall of the upper shell 3 and affects the line of sight, the motor 6 can be started to drive the scraper 9 to rotate for daily cleaning. When the device needs to be thoroughly cleaned, the upper shell 3 is removed upwards and the inside of the device is thoroughly cleaned to ensure the accuracy and reliability of subsequent tests of the device.

[0046] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for performing oxygen index testing under high gas flow rate conditions, comprising a housing (1), characterized in that: The inner bottom wall of the outer shell (1) is provided with a lower shell (2), the top surface of the lower shell (2) is fitted with an upper shell (3), the top surface of the upper shell (3) is provided with a top cover (4), the top cover (4) is embedded with an exhaust pipe (30), the outer wall of the upper shell (3) is installed with a bracket (5), the bracket (5) is installed with a motor (6), the output end of the motor (6) is fixedly provided with a gear (7), the tooth end of the gear (7) is meshed with a gear ring (8), the gear ring (8) is embedded in the interior of the upper shell (3) and is rotatably connected to the upper shell (3), the curved inner wall of the gear ring (8) is fixedly connected with a scraper (9), the outer wall of the scraper (9) is fitted with the inner wall of the upper shell (3) and slides, and the outer wall of the lower shell (2) is provided with a sealing component.

2. The device for performing oxygen index testing under high gas flow rate conditions according to claim 1, characterized in that: The sealing assembly comprises a sleeve (10), the curved inner wall of the sleeve (10) is fixedly connected to the outer wall of the lower shell (2), a sealing gasket is provided inside the sleeve (10), and the upper shell (3) can be inserted into the interior of the sleeve (10).

3. The device for performing oxygen index testing under high gas flow rate conditions according to claim 1, characterized in that: A porous sieve plate (11) is installed inside the lower shell (2), the outer wall of the scraper plate 1 (9) is rotatably connected to the scraper plate 2 (12), the scraper plate 2 (12) is connected to the limit pin (13), a limit hole (14) is provided inside the scraper plate 1 (9), the outer wall of the limit pin (13) is slidably connected to the inside of the limit hole (14), and the bottom surface of the scraper plate 2 (12) is slidably connected to the upper surface of the porous sieve plate (11).

4. The device for performing oxygen index testing under high gas flow rate conditions according to claim 3, characterized in that: A screw rod (15) is fixedly connected to the upper surface of the porous sieve plate (11), and a sample holder (16) is threadedly connected to the outer wall of the screw rod (15).

5. The device for performing oxygen index testing under high gas flow rate conditions according to claim 4, characterized in that: A C-shaped frame (17) is installed inside the sample rack (16), a threaded rod (18) passes through the inside of the C-shaped frame (17) and is threadedly connected to the threaded rod (18), and one end of the threaded rod (18) is fixedly connected to a clamping block (19).

6. The device for testing oxygen index under high gas flow rate conditions according to claim 5, characterized in that: A spiral guide plate (20) and a partition plate (21) are installed inside the lower shell (2), the partition plate (21) is located on the lower side of the porous sieve plate (11), and the spiral guide plate (20) is located on the lower side of the partition plate (21).

7. The device for testing oxygen index under high gas flow rate conditions according to claim 6, characterized in that: An air intake pipe 1 (22) and an air intake pipe 2 (23) are connected through the interior of the lower shell (2). Both the air intake pipe 1 (22) and the air intake pipe 2 (23) are connected to a solenoid valve (24) and a gas flow meter (25). The gas flow meter (25) is closer to the lower shell (2) than the solenoid valve (24).

8. The device for testing oxygen index under high gas flow rate conditions according to claim 5, characterized in that: An electric push rod (31) is provided on the upper surface of the top cover (4), an output end of the electric push rod (31) is fixedly connected to a sliding frame (32), the sliding frame (32) is fixedly connected to a heat insulation tube (33), an outer wall of the heat insulation tube (33) passes through the top cover (4) and is slidably connected to the top cover (4), and an igniter (34) is provided on the bottom surface of the heat insulation tube (33).

9. The device for testing oxygen index under high gas flow rate conditions according to claim 1, characterized in that: A thermometer (26) is provided inside the shell (1), and the thermometer (26) is fitted with the upper shell (3). A bracket 2 (28) is provided on the outer wall of the upper shell (3), and an infrared thermal imaging camera (29) is installed on the bracket 2 (28). A photosensor (27) is installed on the upper shell (3). A gas concentration probe (35) is installed inside the lower shell (2), and the gas concentration probe (35) is located between the porous sieve plate (11) and the partition (21).

10. The device for performing oxygen index testing under high gas flow rate conditions according to claim 9, characterized in that: It also includes a control system, which includes a PLC controller and a host computer. The host computer software is based on a human-computer interaction interface developed in Python.

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