A flame retardant detection device and method for producing low-smoke flame retardant polyethylene materials

Abstract

The present invention relates to the field of flame retardant detection technology, specifically to a flame retardant detection device and method for the production of low-smoke flame retardant polyethylene materials, comprising a combustion chamber for performing flame retardant tests on polyethylene materials, and a positioning frame, which is arranged inside the combustion chamber, and has movable active frames on its top and bottom, and the positioning frame and one side of the movable frame are provided with claws for clamping the polyethylene material, a pulling component for changing the position of the movable frame is provided inside the combustion chamber, and the pulling component can apply dynamic tensile force to the polyethylene material; an oxygen cylinder, which stores oxygen inside, and a nitrogen cylinder for storing nitrogen is provided on one side, the bottoms of the oxygen cylinder and the nitrogen cylinder are both connected to an atmosphere pipe extending into the combustion chamber, and the atmosphere pipe is provided with an environmental component for adjusting the gas concentration, and the environmental component is used to simulate the flame retardant properties of polyethylene materials under different gas environments.

Description

Technical Field

[0001] The present invention relates to the technical field of flame retardancy detection, in particular to a flame retardancy detection device and method for producing low-smoke flame retardant polyethylene materials. Background Art

[0002] With the widespread application of polymer materials in construction, electrical and electronics, transportation, and other fields, the flame retardancy and toxicity control of polyethylene (PE) materials have become key technical requirements for ensuring public safety. Traditional flame-retardant polyethylene materials achieve flame suppression through the addition of magnesium hydroxide, phosphorus-based flame retardants, or intumescent flame retardant systems (IFRs). However, combustion can release large amounts of smoke and toxic gases (such as CO and HCN), significantly increasing the risk of fire escape. Therefore, the development of polyethylene materials with both efficient flame retardancy and low smoke properties, and the establishment of matching detection technologies, have become core research areas in the industry.

[0003] For example, the patent document with the prior art announcement number CN215768421U specifically relates to a flame-retardant polyethylene film detection system, which includes: a processor module, a cutting mechanism, a sealed chamber, a loading platform, an ignition mechanism, a smoke concentration detection mechanism and a gas analysis mechanism; wherein the loading platform horizontally places the flame-retardant polyethylene film sample; the ignition mechanism ignites the flame-retardant polyethylene film sample on the loading platform, and the smoke concentration detection mechanism collects the smoke concentration data in the sealed chamber; the gas emitted by the ignited flame-retardant polyethylene film sample enters the gas analysis mechanism from the sealed chamber, and the gas analysis mechanism collects the emitted gas composition data; this patent document cuts the corresponding area sample on the flame-retardant polyethylene film, and after the flame-retardant polyethylene film sample is ignited by the ignition mechanism, detects the combustion performance and toxicity of the flame-retardant polyethylene film sample, and can feedback specific values, thereby effectively detecting the combustion performance of the flame-retardant polyethylene film and providing a basis for the product to be marketed.

[0004] Traditional flame retardant testing technologies mostly rely on standardized processes such as vertical combustion and oxygen index determination, and use a single fixed ignition source to transiently ignite shear samples to measure parameters such as their burning rate, afterflame time, and toxic gas release. However, this technical system is completely divorced from the complex multi-physical field coupling mechanism of materials such as dynamic tensile strength, air content, and three-dimensional airflow disturbances in real fire scenes. This idealized laboratory testing environment results in test results that can only characterize the instantaneous combustion behavior of the material under a single working condition, but cannot accurately reproduce the key safety characteristics of the material in an actual fire caused by the continuous combustion path evolution, long-term flame retardant performance attenuation, and dynamic release of toxic components in smoke due to the multi-field coupling of heat-oxygen-force-flow fields. Ultimately, there is a significant deviation between laboratory evaluation data and the material safety performance in real fire scenes, which makes it difficult to meet the precise assessment requirements of material safety in engineering applications. To this end, the present application proposes a flame retardant detection device and method for the production of low-smoke flame retardant polyethylene materials. Summary of the Invention

[0005] The object of the present invention is to provide a flame retardancy detection device and method for the production of low-smoke flame retardant polyethylene materials, so as to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: a flame retardant detection device for the production of low-smoke flame retardant polyethylene materials, comprising a combustion chamber for performing flame retardant testing on polyethylene materials, an igniter for igniting the polyethylene materials, and a host for analyzing smoke generated by the combustion of the polyethylene materials, and further comprising:

[0007] A positioning frame is provided inside the combustion chamber, and movable frames are provided on the top and bottom of the positioning frame and one side of the movable frame are provided with clamps for clamping the polyethylene material. A pulling component for changing the position of the movable frame is provided inside the combustion chamber, and the pulling component can apply dynamic tensile force to the polyethylene material;

[0008] An oxygen cylinder stores oxygen, and a nitrogen cylinder for storing nitrogen is provided on one side. The bottoms of the oxygen cylinder and the nitrogen cylinder are both connected to an atmosphere pipe extending into the combustion chamber, and an environmental component for adjusting the gas concentration is provided inside the atmosphere pipe. The environmental component is used to simulate the flame retardant properties of polyethylene materials under different gas environments;

[0009] The gas mixing shell is used to mix gases and regulate the oxygen concentration. One end of the shell is connected to a gas pipe that delivers gas to the combustion chamber. A gas disturbing component is provided inside the gas mixing shell to push the gas to sweep the surface of the polyethylene material. The oxygen concentration of the air in the gas pipe is adjusted according to the power of the gas disturbing component.

[0010] Preferably, the pulling assembly includes two guide grooves opened on the inner wall of the combustion chamber, and the interiors of the two guide grooves are respectively slidably connected with sliding rods connected to the two movable frames, and the outer surfaces of the sliding rods are provided with torsion springs for driving the movable frames to reset, and the outer surfaces of the two sliding rods are jointly provided with ventilation limit sleeves that can change their own positions.

[0011] Preferably, a drive motor is fixedly connected to one side of the combustion chamber, a connecting sleeve is fixedly connected to the middle end of the torsion spring, and the output end of the drive motor is fixedly connected to the connecting sleeve, and scissors that can cut polyethylene materials are provided on the top and bottom of the positioning frame.

[0012] Preferably, the environmental component includes an air-connecting pipe connected to the bottom of the atmosphere pipe and communicating with the outside air, a three-way valve is provided at the connection between the air-connecting pipe and the atmosphere pipe, a gas supply shell is provided inside the atmosphere pipe, and an axial fan for promoting gas flow is provided inside the gas supply shell.

[0013] Preferably, the air disturbing component includes a mixing chamber opened inside the gas mixing shell, and the interior of the mixing chamber is connected to an oxygen supply pipe connected to the oxygen cylinder, the interior of the mixing chamber is connected to a nitrogen supply pipe connected to the nitrogen cylinder, the interior of the gas mixing shell is provided with fan blades for promoting gas flow, and one end of the gas supply pipe is connected to a gas distribution plate.

[0014] Preferably, one end of the mixing shell is fixedly connected to a servo motor, the output end of the servo motor extends to the interior of the mixing shell and is fixedly connected to a ventilation connecting rod, the fan blades are fixedly connected to the outer surface of the ventilation connecting rod, the outer surface of the ventilation connecting rod is connected to a rotating sleeve placed inside the mixing chamber, and the outer surface of the rotating sleeve is evenly fixedly connected to a plurality of push plates, and an air string groove is opened on one side of the mixing chamber.

[0015] Preferably, the interior of the air delivery pipe is connected to a telescopic tube connected to the ventilation limit sleeve, and the outer surface of the ventilation limit sleeve is connected to a plurality of purge pipes connected to the interior thereof, and the plurality of purge pipes are all directed toward the polyethylene material.

[0016] Preferably, an empty tube communicating with the mixing chamber is provided at the bottom of the gas mixing shell, a one-way valve is fixedly connected to the interior of the empty tube, and a plurality of oxygen leakage holes are opened on one side of the mixing chamber.

[0017] Preferably, a laser scanner is fixedly connected to the interior of the combustion chamber, and a plurality of wax dripping scales for calculating the weight of wax dripping produced by the combustion of polyethylene material are arranged inside the combustion chamber. A first guide rail is fixedly connected to the interior of the combustion chamber, and the output end of the first guide rail is connected to a second guide rail for adjusting the position of the igniter. The top of the combustion chamber is connected to a flue, and a flue gas analyzer for detecting flue gas is fixedly connected to the interior of the flue.

[0018] The present invention also provides a flame retardant detection method for the production of low-smoke flame retardant polyethylene materials, comprising the following steps:

[0019] S1. When in use, first place the polyethylene material in multiple clamps to fix it, then operate the igniter to ignite the polyethylene material to test its flame retardancy;

[0020] S2. Subsequently, the pulling component is operated to apply a pulling force to the polyethylene material to detect the burning condition thereof under the pulling;

[0021] S3. Turn on the environmental component and observe the combustion of the polyethylene material in environments with different oxygen contents;

[0022] S4. Opening the air disturbance component allows the gas in the mixing chamber to be mixed and discharged through the air pipe to purge the polyethylene material.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The combustion chamber integrates a laser scanner, wax dripping scale, flue and flue gas analyzer, which can simultaneously monitor the combustion behavior, weight of molten dripping materials and flue gas composition, realize multi-parameter coupling analysis, apply tensile force to the polyethylene material by pulling the component, simulate the stress and deformation scene of the material in an actual fire, evaluate its flame retardant stability under mechanical stress, and fill the gap of traditional static testing. The first guide rail and the second guide rail form a two-axis mobile platform, which can accurately adjust the spatial position of the igniter to achieve directional ignition of different areas of the polyethylene material, revealing the local flame retardant performance differences of the material. The movable frame is driven by the slide rod to move, so that the material switches from a vertical state to a horizontal state. In the horizontal state, the influence of different installation postures on flame spread, dripping behavior and smoke release is verified. The scissors can quickly cut the material to form multiple test samples, and cooperate with the movable igniter to achieve synchronous ignition. The laser scanner synchronously monitors the combustion process of each section, and compares and analyzes the uniformity of flame retardant distribution and local defects inside the material. The flue gas analyzer is directly connected to the flue to capture toxic components such as CO, CO2, particulate matter, etc. in the combustion products in real time. Combined with the wax dripping scale data, the whole process of material behavior from installation, stress to combustion is reproduced through stretching, shearing and posture adjustment functions, and its long-term safety under complex working conditions such as cable sheathing and building components is evaluated.

[0025] 2. By switching the oxygen cylinder, nitrogen cylinder and the outside air through the three-way valve, combined with the forced convection of the axial fan, different oxygen concentration gradients in the combustion chamber can be quickly established, realizing stepless switching from oxygen-rich to oxygen-deficient environments, and accurately simulating the combustion conditions at each stage of fire development. The servo motor drives the fan blades and the air push plate to rotate synchronously. By adjusting the speed, the turbulence intensity of the gas in the mixing chamber is changed. Combined with the dynamic exhaust of the oxygen leakage hole, the oxygen concentration and wind speed are nonlinearly coupled. The gas pipeline distributes the mixed gas to multiple purge pipes through the gas distribution plate. Combined with the rotation of the ventilation limit sleeve, the multi-section polyethylene material after shearing can be independently controlled, and the distribution of flame retardants inside the material can be simultaneously revealed to affect the combustion. The influence of characteristics, switching gas composition at the moment of material shearing, can simulate the scenario of material exposure to different oxygen concentration environments after fracture in fire, evaluate the risk of secondary combustion after the flame retardant layer is damaged, and directly act on the burning surface through the purge tube to change the flame front shape and droplet trajectory. The synchronously collected flue gas data can reveal the quantitative relationship between oxygen concentration, wind speed and flue gas toxicity, providing a basis for toxicological evaluation. Changing the oxygen content in the mixing chamber can form high oxygen concentration micro-areas on the material surface, accelerate the pyrolysis reaction, and be used to evaluate the failure threshold of flame retardants under local overheating conditions. The formation of oxygen-deficient areas can simulate the burning environment of embers after the flame is extinguished, and detect the smoldering tendency and re-ignition risk of materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the first three-dimensional structure of the present invention;

[0027] Figure 2 is a schematic diagram of a second three-dimensional structure of the present invention;

[0028] Figure 3 Schematic diagram of the cross-sectional structure of the combustion chamber of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure in the combustion chamber of the present invention;

[0030] Figure 5 Schematic diagram of the structure of the ventilation limit sleeve in the present invention;

[0031] Figure 6 It is a structural schematic diagram of the oxygen cylinder in the present invention;

[0032] Figure 7 Schematic diagram of the cross-sectional structure of the gas transmission shell in the present invention;

[0033] Figure 8 Schematic diagram of the structure of the fan blade in the present invention;

[0034] Figure 9 Schematic diagram of the structure of the gas string slot in the present invention;

[0035] Figure 10It is a structural diagram of the transfer sleeve in the present invention;

[0036] Figure 11 Schematic diagram of the structure of the sliding rod in the present invention.

[0037] In the figure: 100, combustion chamber; 101, main engine; 102, flue; 103, flue gas analyzer; 104, observation window; 105, sliding door; 106, first guide rail; 107, second guide rail; 108, igniter; 109, polyethylene material; 110, laser scanner; 111, wax dripping scale; 200, positioning frame; 201, movable frame; 202, clamping claw; 203, guide groove; 204, scissors; 205, ventilation limit sleeve; 206, connecting sleeve; 207, driving motor; 208, slide rod; 209, torsion spring; 300, oxygen Gas cylinder; 301, nitrogen cylinder; 302, atmosphere tube; 303, air connection tube; 304, three-way valve; 305, gas delivery shell; 306, axial fan; 400, gas mixing shell; 401, gas delivery pipe; 402, gas distributor; 403, servo motor; 404, telescopic tube; 405, purge tube; 406, mixing chamber; 407, gas flow groove; 408, rotating sleeve; 409, air push plate; 410, oxygen leakage hole; 411, ventilation connecting rod; 412, fan blade; 413, air connection tube; 414, one-way valve; 415, oxygen delivery pipe; 416, nitrogen delivery pipe. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Example 1: Please refer to Figure 1-Figure 3The present invention provides a technical solution: a flame retardant detection device for the production of low-smoke flame retardant polyethylene materials, comprising a combustion chamber 100 for performing a flame retardant test on a polyethylene material 109, an igniter 108 for igniting the polyethylene material 109, and a host 101 for analyzing the smoke generated by the combustion of the polyethylene material 109. A laser scanner 110 is fixedly connected to the interior of the combustion chamber 100. A plurality of wax dripping scales 111 for calculating the weight of wax dripping generated by the combustion of the polyethylene material 109 are arranged inside the combustion chamber 100. A first guide rail 106 is fixedly connected to the interior of the combustion chamber 100, and the first guide rail The output end of 106 is connected to a second guide rail 107 for adjusting the position of the igniter 108. The top of the combustion chamber 100 is connected to the flue 102, and the interior of the flue 102 is fixedly connected to a flue gas analyzer 103 for detecting flue gas. By setting the igniter 108, the polyethylene material 109 can be ignited to achieve flame retardant detection, and with the cooperation of the first guide rail 106 and the second guide rail 107, different positions of the polyethylene material 109 can be ignited, thereby achieving flame retardant testing of different positions of the polyethylene material 109, and the flue gas analyzer 103 can analyze the flue gas generated by the combustion of the polyethylene material 109.

[0040] See also Figure 4-Figure 6 as well as Figure 11 , also includes a positioning frame 200, which is arranged inside the combustion chamber 100, and a movable movable frame 201 is provided on the top and bottom of the combustion chamber 100, and a clamping claw 202 is provided on one side of the positioning frame 200 and the movable frame 201 for clamping the polyethylene material 109. A pulling component for changing the position of the movable frame 201 is provided inside the combustion chamber 100, and the pulling component can apply dynamic tensile force to the polyethylene material 109. The setting of the pulling component can change the position of the movable frame 201 to adjust the position of the polyethylene material 109, so that it can be changed from a vertical direction to a horizontal direction, and flame retardant detection in different postures can be performed.

[0041] Among them, the pulling component includes two guide grooves 203 opened on the inner wall of the combustion chamber 100, and the insides of the two guide grooves 203 are respectively slidably connected with slide rods 208 connected to the two movable frames 201, and the outer surface of the slide rod 208 is provided with a torsion spring 209 for driving the movable frame 201 to reset, and the outer surfaces of the two slide rods 208 are jointly provided with a ventilation limit sleeve 205 that can change its own position. A drive motor 207 is fixedly connected to one side of the combustion chamber 100, and the middle end of the torsion spring 209 is fixedly connected to the connecting sleeve 206, and the output end of the drive motor 207 is fixedly connected to the connecting sleeve 206. The top and bottom of the positioning frame 200 are provided with a polyethylene material that can be cut. The scissors 204 for the polyethylene material 109 can be used to cut the polyethylene material 109 into multiple sections by setting the scissors 204, which can be ignited separately by the igniter 108 to perform a synchronous flame retardant test. The combustion conditions of the multiple sections of polyethylene material 109 are detected by the laser scanner 110. At the same time, when the connecting sleeve 206 rotates, it will drive the movable frame 201 to move and dislocate it. At this time, multiple jaws 202 synchronously clamp the polyethylene material 109, so that the reset force of the torsion spring 209 will continue to be applied to the movable frame 201, thereby applying a tensile force to the polyethylene material 109, thereby detecting whether the polyethylene material 109 has different flame retardant properties due to the influence of stretching in the burning state.

[0042] Specifically, when in use, first open the sliding door 105 and place the cylindrical polyethylene material 109 in multiple clamps 202 for fixation, then close the sliding door 105 and operate the igniter 108 to ignite the polyethylene material 109 to detect its burning condition in a vertical state. In addition, the ventilation limit sleeve 205 can be driven to rotate by operating the drive motor 207. The movement of the ventilation limit sleeve 205 will pull the slide rod 208 to move in the guide groove 203, thereby driving the movable frame 201 to move, so that the movable frame 201 and the positioning frame 200 are located in the same horizontal plane. At this time, the polyethylene material 109 is subjected to a pulling force under the action of the torsion spring 209. The igniter 108 is operated to ignite the polyethylene material 109 to detect its burning condition under pulling. The scissors 204 can also be operated to cut the polyethylene material 109 into multiple ends for separate combustion tests.

[0043] In summary, the combustion chamber 100 integrates a laser scanner 110, a wax dripping scale 111, a flue 102 and a flue gas analyzer 103, which can simultaneously monitor the combustion behavior, the weight of the molten dripping material and the flue gas composition, realize multi-parameter coupling analysis, apply tensile force to the polyethylene material 109 by pulling the component, simulate the stress deformation scene of the material in an actual fire, evaluate its flame retardant stability under mechanical stress, and fill the gap of traditional static testing. The first guide rail 106 and the second guide rail 107 constitute a two-axis mobile platform, which can accurately adjust the spatial position of the igniter 108 to achieve directional ignition of different areas of the polyethylene material 109, revealing the local flame retardant performance differences of the material, and drive the movable frame 201 to move by the slide rod 208. The material is switched from a vertical state to a horizontal state to verify the effects of different installation postures on flame spread, dripping behavior, and smoke release. The scissors 204 can quickly cut the material to form multiple test specimens, and cooperate with the movable igniter 108 to achieve synchronous ignition. The laser scanner 110 synchronously monitors the combustion process of each section, and compares and analyzes the uniformity of flame retardant distribution and local defects inside the material. The flue gas analyzer 103 is directly connected to the flue 102 to capture toxic components such as CO, CO2, and particulate matter in the combustion products in real time. Combined with the data from the wax dripping scale 111, the entire process of material behavior from installation, stress to combustion is reproduced through stretching, shearing, and posture adjustment functions, and its long-term safety under complex working conditions such as cable sheaths and building components is evaluated.

[0044] Example 2: Please refer to Figure 7-10 The present invention also provides a technical solution, which is different from the technical solution of embodiment 1: a flame retardant detection device for the production of low-smoke flame retardant polyethylene material, which also includes an oxygen cylinder 300, which stores oxygen inside, and a nitrogen cylinder 301 for storing nitrogen is arranged on one side. The bottoms of the oxygen cylinder 300 and the nitrogen cylinder 301 are both connected to an atmosphere pipe 302 extending into the combustion chamber 100, and the interior of the atmosphere pipe 302 is provided with an environmental component for adjusting the gas concentration, and the environmental component is used to simulate the flame retardant performance of the polyethylene material 109 under different gas environments. By setting the environmental component, the combustion environment in the combustion chamber 109 can be changed. By adjusting the ratio of oxygen to nitrogen, the oxygen concentration in the combustion environment can be accurately controlled, so as to study the influence of oxygen concentration on the combustion characteristics of the polyethylene material 109, such as combustion rate, combustion heat release, and smoke generation.

[0045] Among them, the environmental component includes an air-connecting pipe 303 connected to the bottom of the atmosphere pipe 302 and connected to the outside air. A three-way valve 304 is provided at the connection between the air-connecting pipe 303 and the atmosphere pipe 302. A gas supply shell 305 is provided inside the atmosphere pipe 302, and an axial fan 306 for promoting gas flow is provided inside the gas supply shell 305. By setting the three-way valve 304, the concentration of the gas entering the combustion chamber 100 can be adjusted. It is also worth mentioning that when the polyethylene material 109 is cut into multiple sections, different oxygen contents can be simulated in the combustion chamber 100 to detect the combustion rate and smoldering tendency of the polyethylene material 109. The atmosphere pipe 302 introduces oxygen and nitrogen respectively, so that the two atmosphere pipes 302 are respectively facing the two sections of polyethylene material 109 to observe their combustion status under different oxygen contents.

[0046] It also includes a gas mixing shell 400, which is used to mix gases and regulate the oxygen concentration. One end of the gas mixing shell is connected to a gas supply pipe 401 that is transported to the combustion chamber 100. The interior of the gas mixing shell 400 is provided with an air disturbance component that pushes the gas to sweep the surface of the polyethylene material 109. The oxygen concentration of the air in the gas supply pipe 401 is adjusted according to the power of the air disturbance component. By setting the air disturbance component, the air flow can be pushed to sweep the burning polyethylene material 109. At the same time, the oxygen content and the wind speed can be adjusted to simulate the combustion of the polyethylene material 109 under different wind speeds and oxygen contents.

[0047] The air disturbance component includes a mixing chamber 406 opened inside the gas mixing shell 400, and the interior of the mixing chamber 406 is connected to an oxygen delivery pipe 415 connected to the oxygen cylinder 300, and the interior of the mixing chamber 406 is connected to a nitrogen delivery pipe 416 connected to the nitrogen cylinder 301. The interior of the gas mixing shell 400 is provided with a fan blade 412 to promote the flow of gas, one end of the gas delivery pipe 401 is connected to the gas distribution plate 402, and the interior of the gas delivery pipe 401 is connected to the ventilation limit sleeve 205. The telescopic tube 404 is connected, and the outer surface of the ventilation limit sleeve 205 is connected to multiple purge pipes 405 connected to the interior thereof, and the multiple purge pipes 405 are all directed toward the polyethylene material 109. Oxygen is introduced through an oxygen supply pipe 415, and nitrogen is introduced through a nitrogen supply pipe 416. The two are mixed in the mixing chamber 406, and the fan blades 412 are provided to transport the mixed gas to the gas supply pipe 401, and then discharged by the multiple purge pipes 405 to achieve a purging effect.

[0048] Furthermore, one end of the mixing shell 400 is fixedly connected to a servo motor 403, the output end of the servo motor 403 extends to the interior of the mixing shell 400 and is fixedly connected to a ventilation connecting rod 411, the fan blade 412 is fixedly connected to the outer surface of the ventilation connecting rod 411, the outer surface of the ventilation connecting rod 411 is connected to a rotating sleeve 408 placed inside the mixing chamber 406, and the outer surface of the rotating sleeve 408 is evenly fixedly connected to a plurality of push plates 409, a gas string groove 407 is provided on one side of the mixing chamber 406, an empty pipe 413 is provided at the bottom of the mixing shell 400 and is connected to the mixing chamber 406, a one-way valve 414 is fixedly connected to the inside of the empty pipe 413, and a one-way valve 414 is fixedly connected to the inside of the mixing chamber 406. Multiple oxygen leakage holes 410 are arranged to rotate along with the rotation of the air supply pipe 401 by setting the air push plate 409. As the speed of the servo motor 403 increases, the fan blades 412 will generate a higher wind speed. At this time, the stirring of the air push plate 409 will absorb more gas from the nitrogen supply pipe 416 and the oxygen supply pipe 415. At this time, due to the setting of the air string groove 407, at the high speed of the air push plate 409, the gas absorbed from the oxygen supply pipe 415 and the empty pipe 413 will be reduced, and the gas absorbed from the nitrogen supply pipe 416 will increase, thereby reducing the oxygen content of the gas transported by the fan blades 412. At the same time, the oxygen leakage holes 410 will discharge a small amount of oxygen under the high-speed rotation of the air push plate 409.

[0049] Specifically, the scissors 204 are operated to cut the polyethylene material 109 into multiple sections, and the three-way valve 304 is operated to change the oxygen content of the conveying gas. Under the action of the axial fan 306, gases with different oxygen contents are blown to different polyethylene materials 109 to observe their combustion conditions under environments with different oxygen contents. The three-way valve 304 can then be closed to allow the gas to flow into the interior of the mixing shell 400. While igniting, the servo motor 403 is turned on to drive the fan blades 412 to rotate to form an airflow that is discharged through the air supply pipe 401. At this time, the rotation of the air push plate 409 will mix the gas in the mixing chamber 406, and discharge it through the purge pipe 405 to purge the surface of the polyethylene material 109. As the speed of the servo motor 403 increases, the mixing ratio of the gas in the mixing chamber 406 will change, and the oxygen delivery value in the oxygen supply pipe 415 will decrease.

[0050] In summary, by switching the oxygen cylinder 300, the nitrogen cylinder 301 and the outside air through the three-way valve 304, combined with the forced convection of the axial fan 306, different oxygen concentration gradients can be quickly established in the combustion chamber 100, and stepless switching from oxygen-rich to oxygen-deficient environments can be achieved, accurately simulating the combustion conditions at each stage of fire development. The servo motor 403 drives the fan blades 412 to rotate synchronously with the push plate 409, and changes the gas turbulence intensity in the mixing chamber 406 by adjusting the speed. Combined with the dynamic exhaust of the oxygen leakage hole 410, the oxygen concentration and wind speed are nonlinearly coupled. The gas supply pipe 401 distributes the mixed gas to multiple purge pipes 405 through the gas distribution plate 402. Combined with the rotation of the ventilation limit sleeve 205, the sheared multi-segment polyethylene material 109 can be independently circulated. The system controls the environment and simultaneously reveals the influence of the distribution of flame retardants inside the material on the combustion characteristics. By switching the gas composition at the moment of material shearing, it can simulate the scenario of the material being exposed to different oxygen concentration environments after being broken in a fire, and evaluate the risk of secondary combustion after the flame retardant layer is damaged. The purge tube 405 directly acts on the combustion surface to change the shape of the flame front and the trajectory of the droplets. The simultaneously collected flue gas data can reveal the quantitative relationship between oxygen concentration, wind speed and flue gas toxicity, providing a basis for toxicological evaluation. By changing the oxygen content through the mixing chamber 406, a high oxygen concentration micro-region can be formed on the material surface, accelerating the pyrolysis reaction, which is used to evaluate the failure threshold of the flame retardant under local overheating conditions. The formation of an oxygen-depleted zone can simulate the burning environment of the embers after the flame is extinguished, and detect the smoldering tendency and re-ignition risk of the material.

[0051] Example 3: Please refer to Figures 1-11 The present invention also provides a technical solution, which is different from the technical solution of embodiment 1: a flame retardant detection method for the production of low-smoke flame retardant polyethylene materials, comprising the following steps:

[0052] S1. When in use, first open the sliding door 105 and place the cylindrical polyethylene material 109 in the multiple clamps 202 for fixation, then close the sliding door 105 and operate the igniter 108 to ignite the polyethylene material 109, and detect its combustion status in the vertical state;

[0053] S2. Re-fix the polyethylene material 109 according to the method of S1. Then operate the drive motor 207 to rotate, thereby driving the ventilation limit sleeve 205 to rotate, and drive the movable frame 201 to move, so that the movable frame 201 and the positioning frame 200 are located at the same horizontal plane. At this time, the polyethylene material 109 is subjected to a pulling force under the action of the torsion spring 209. Operate the igniter 108 to ignite the polyethylene material 109, and detect its combustion under the pulling;

[0054] S3. Reposition the movable frame 201 and the positioning frame 200 to the same horizontal plane according to the method of S2. Use the scissors 204 to cut the polyethylene material 109 into multiple sections. Operate the three-way valve 304 to change the oxygen content of the conveying gas. Under the action of the axial fan 306, the gas with different oxygen contents is blown to different polyethylene materials 109 to observe their combustion under different oxygen content environments.

[0055] S4. Fix or adjust the posture or cut the polyethylene material 109 again according to S1, S2 or S3. While igniting, turn on the servo motor 403 to drive the fan blades 412 to rotate to form an air flow that is discharged through the air supply pipe 401. At this time, the rotation of the air push plate 409 will mix the gas in the mixing chamber 406, and discharge it through the purge pipe 405 to purge the surface of the polyethylene material 109. As the speed of the servo motor 403 increases, the mixing ratio of the gas in the mixing chamber 406 will change, and the oxygen delivery value in the oxygen supply pipe 415 will decrease.

[0056] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0057] 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 flame retardant detection device for the production of low-smoke flame retardant polyethylene materials, comprising a combustion chamber (100) for performing a flame retardant test on the polyethylene material (109), an igniter (108) for igniting the polyethylene material (109), and a host (101) for analyzing smoke generated by the combustion of the polyethylene material (109), characterized in that: Also includes: A positioning frame (200) is provided inside the combustion chamber (100), and a movable frame (201) is provided on the top and bottom of the positioning frame (200), and a clamping claw (202) for clamping the polyethylene material (109) is provided on one side of the positioning frame (200) and the movable frame (201). A pulling component for changing the position of the movable frame (201) is provided inside the combustion chamber (100), and the pulling component can apply a dynamic tensile force to the polyethylene material (109); An oxygen cylinder (300) stores oxygen therein, and a nitrogen cylinder (301) for storing nitrogen is provided on one side thereof, wherein the bottoms of the oxygen cylinder (300) and the nitrogen cylinder (301) are both connected to an atmosphere pipe (302) extending into the combustion chamber (100), and an environmental component for adjusting gas concentration is provided inside the atmosphere pipe (302), and the environmental component is used to simulate the flame retardant properties of the polyethylene material (109) under different gas environments; A gas mixing shell (400) is used to mix gas and adjust the oxygen concentration. One end of the gas mixing shell is connected to a gas delivery pipe (401) that delivers gas to the combustion chamber (100). An air disturbance component is provided inside the gas mixing shell (400) to push gas to sweep the surface of the polyethylene material (109). The oxygen concentration of the air in the gas delivery pipe (401) is adjusted according to the power of the air disturbance component. The pulling assembly includes two guide grooves (203) provided on the inner wall of the combustion chamber (100), and the interiors of the two guide grooves (203) are respectively slidably connected with slide rods (208) connected to the two movable frames (201), and the outer surfaces of the slide rods (208) are provided with torsion springs (209) for driving the movable frames (201) to reset, and the outer surfaces of the two slide rods (208) are jointly provided with ventilation limit sleeves (205) capable of changing their own positions; A laser scanner (110) is fixedly connected to the interior of the combustion chamber (100), and a plurality of wax dripping scales (111) for calculating the weight of wax dripping generated by the combustion of the polyethylene material (109) are provided inside the combustion chamber (100). A first guide rail (106) is fixedly connected to the interior of the combustion chamber (100), and the output end of the first guide rail (106) is connected to a second guide rail (107) for adjusting the position of the igniter (108). The top of the combustion chamber (100) is connected to a flue (102), and a flue gas analyzer (103) for detecting flue gas is fixedly connected to the interior of the flue (102).

2. The flame retardant detection device for the production of low-smoke flame retardant polyethylene materials according to claim 1, characterized in that: A drive motor (207) is fixedly connected to one side of the combustion chamber (100), a connecting sleeve (206) is fixedly connected to the middle end of the torsion spring (209), and an output end of the drive motor (207) is fixedly connected to the connecting sleeve (206), and scissors (204) capable of cutting the polyethylene material (109) are provided at the top and bottom of the positioning frame (200).

3. The flame retardant detection device for the production of low-smoke flame retardant polyethylene materials according to claim 1, characterized in that: The environmental component comprises an air connection pipe (303) connected to the bottom of the atmosphere pipe (302) and communicating with the outside air, a three-way valve (304) is provided at the connection between the air connection pipe (303) and the atmosphere pipe (302), a gas transmission shell (305) is provided inside the atmosphere pipe (302), and an axial fan (306) for promoting gas flow is provided inside the gas transmission shell (305).

4. The flame retardant detection device for the production of low-smoke flame retardant polyethylene materials according to claim 1, characterized in that: The air disturbance component comprises a mixing chamber (406) opened inside the gas mixing shell (400), and the interior of the mixing chamber (406) is connected to an oxygen supply pipe (415) connected to the oxygen cylinder (300), and the interior of the mixing chamber (406) is connected to a nitrogen supply pipe (416) connected to the nitrogen cylinder (301). The interior of the gas mixing shell (400) is provided with a fan blade (412) for promoting gas flow, and one end of the gas supply pipe (401) is connected to a gas distribution plate (402).

5. The flame retardant detection device for the production of low-smoke flame retardant polyethylene materials according to claim 4, characterized in that: One end of the mixing shell (400) is fixedly connected to a servo motor (403), an output end of the servo motor (403) extends to the interior of the mixing shell (400) and is fixedly connected to a ventilation connecting rod (411), the fan blade (412) is fixedly connected to the outer surface of the ventilation connecting rod (411), the outer surface of the ventilation connecting rod (411) is connected to a rotating sleeve (408) placed inside the mixing chamber (406), and the outer surface of the rotating sleeve (408) is evenly fixedly connected to a plurality of air push plates (409), and an air flow groove (407) is opened on one side of the mixing chamber (406).

6. The flame retardant detection device for the production of low-smoke flame retardant polyethylene materials according to claim 1, characterized in that: The interior of the air delivery pipe (401) is connected to a telescopic pipe (404) connected to the ventilation limit sleeve (205), and the outer surface of the ventilation limit sleeve (205) is connected to multiple purge pipes (405) connected to the interior thereof, and the multiple purge pipes (405) are all directed toward the polyethylene material (109).

7. The flame retardant detection device for the production of low-smoke flame retardant polyethylene materials according to claim 5, characterized in that: An empty tube (413) communicating with the mixing chamber (406) is provided at the bottom of the gas mixing shell (400), a one-way valve (414) is fixedly connected to the interior of the empty tube (413), and a plurality of oxygen leakage holes (410) are provided on one side of the mixing chamber (406).

8. A flame retardant detection method for the production of low-smoke flame retardant polyethylene materials, according to a flame retardant detection device for the production of low-smoke flame retardant polyethylene materials according to any one of claims 1-7, characterized in that: The following steps are involved: S1. When in use, firstly place the polyethylene material (109) in a plurality of clamps (202) to fix it, then operate the igniter (108) to ignite the polyethylene material (109) to test its flame retardancy; S2, then operating the pulling component to apply a pulling force to the polyethylene material (109) to detect its burning condition under the pulling; S3, turning on the environmental component and observing the combustion of the polyethylene material (109) in environments with different oxygen contents; S4. The gas disturbance component is turned on to mix the gas in the mixing chamber (406) and discharge the purging polyethylene material (109) through the gas delivery pipe (401).

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