Flame-retardant detection device and method for production of low-smoke flame-retardant polyethylene material

Abstract

The invention relates to the technical field of flame-retardant detection, in particular to a flame-retardant detection device and method for low-smoke flame-retardant polyethylene material product.The flame-retardant detection device comprises a combustion chamber used for conducting flame-retardant testing on a polyethylene material and further comprises a positioning frame arranged in the combustion chamber, and movable frames are arranged at the top and the bottom of the positioning frame correspondingly; clamping jaws for clamping the polyethylene material are arranged on one side of the positioning frame and one side of the movable frame, a pulling assembly for changing the position of the movable frame is arranged in the combustion chamber, and the pulling assembly can apply dynamic drawing force to the polyethylene material; oxygen is stored in the oxygen bottle, a nitrogen bottle for storing nitrogen is arranged on one side of the oxygen bottle, the bottom of the oxygen bottle and the bottom of the nitrogen bottle communicate with atmosphere pipes extending into the combustion chamber, environment assemblies for adjusting the gas concentration are arranged in the atmosphere pipes, and the environment assemblies are used for simulating the flame retardant property of the polyethylene material in different gas environments.

Description

Technical Field

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

[0002] With the wide application of polymer materials in fields such as construction, electronics and electrical engineering, and transportation, the flame retardancy performance and combustion flue gas toxicity control of polyethylene (PE) materials have become key technical requirements for ensuring public safety. Traditional flame retardant polyethylene materials achieve flame inhibition by adding magnesium hydroxide, phosphorus-based flame retardants or intumescent flame retardant systems (IFRs), but a large amount of smoke and toxic gases (such as CO, HCN) may be released during their combustion process, resulting in a significant increase in the risk of fire escape. Therefore, developing polyethylene materials with both high-efficiency flame retardancy and low-smoke characteristics and establishing a matching detection technology have become the core research directions in the industry.

[0003] For example, in the patent document with the prior art publication number CN215768421U, this patent document specifically relates to a detection system for a flame retardant polyethylene film. This detection system for a flame retardant polyethylene film 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; among them, the loading platform horizontally places a sample of the flame retardant polyethylene film; the ignition mechanism ignites the sample of the flame retardant polyethylene film 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 sample of the flame retardant polyethylene film enters the gas analysis mechanism from the sealed chamber, and the gas analysis mechanism collects the component data of the emitted gas; this patent document realizes the effective detection of the combustion performance of the flame retardant polyethylene film by cutting a corresponding area sample on the flame retardant polyethylene film, igniting the sample of the flame retardant polyethylene film by the ignition mechanism, detecting the combustion performance and toxicity of the sample of the flame retardant polyethylene film, and being able to feedback specific values, providing a basis for the product to enter the market.

[0004] Traditional flame retardancy detection techniques mostly rely on standardized processes such as vertical burning and oxygen index determination. A single fixed ignition source is used to instantaneously ignite a sheared sample to measure parameters such as its burning rate, afterflame time, and release of toxic gases. However, this technical system is completely divorced from the complex multi-physical field coupling mechanisms such as the dynamic tensile strength of materials, air content, and three-dimensional airflow disturbance in real fire scenarios. This idealized laboratory test environment results in the detection results only being able to characterize the instantaneous combustion behavior of materials under a single working condition, but unable to accurately reproduce the key safety characteristics such as the continuous evolution of the combustion path, long-term attenuation of flame retardancy efficiency, and dynamic release of flue gas toxic components caused by the multi-field coupling of heat-oxygen-force-flow fields in actual fires. Ultimately, there is a significant deviation between the laboratory evaluation data and the material safety performance in real fire scenarios, making it difficult to meet the precise evaluation requirements for material safety in engineering applications. Therefore, this application proposes a flame retardancy detection device and method for producing low-smoke flame retardant polyethylene materials. Summary of the Invention

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

[0006] To achieve the above object, the present invention provides the following technical solution: A flame retardancy detection device for producing low-smoke flame retardant polyethylene materials, including a combustion chamber for conducting flame retardancy tests on polyethylene materials, an igniter for igniting the polyethylene materials, and a main unit for analyzing the flue gas generated by the combustion of the polyethylene materials, further including: A positioning frame, which is arranged inside the combustion chamber, with movable movable frames provided at both its top and bottom, and clamping jaws for clamping the polyethylene materials are provided on one side of both the positioning frame and the movable frame. A pulling component for changing the position of the movable frame is arranged inside the combustion chamber, and the pulling component can apply a dynamic tensile force to the polyethylene materials; An oxygen cylinder, which stores oxygen inside, and a nitrogen cylinder for storing nitrogen is arranged on one side of it. Atmosphere pipes extending into the combustion chamber are connected to the bottoms of both the oxygen cylinder and the nitrogen cylinder, and an environment component for adjusting the gas concentration is arranged inside the atmosphere pipes, and the environment component is used to simulate the flame retardancy performance of polyethylene materials under different gas environments; A gas mixing shell, which is used for mixing gases to regulate the oxygen concentration, and one end of it is connected to an air delivery pipe extending into the combustion chamber. A gas disturbing component for pushing the gas to purge the surface of the polyethylene materials is arranged inside the gas mixing shell, and the oxygen concentration of the air in the air delivery pipe is adjusted following the power of the gas disturbing component.

[0007] Preferably, the pulling assembly includes two guide grooves formed in the inner wall of the combustion chamber. Slide rods connected to the two movable frames are respectively slidably connected inside the two guide grooves. A torsion spring for driving the movable frame to reset is sleeved on the outer surface of the slide rod. An air vent limiting sleeve capable of changing its own position is commonly sleeved on the outer surfaces of the two slide rods.

[0008] Preferably, a driving motor is fixedly connected to one side of the combustion chamber. The middle end of the torsion spring is fixedly connected to a connecting sleeve, and the output end of the driving motor is fixedly connected to the connecting sleeve. Scissors capable of cutting polyethylene materials are provided at the top and bottom of the positioning frame.

[0009] Preferably, the environment assembly 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. An air delivery shell is provided inside the atmosphere pipe, and an axial fan for promoting gas flow is provided inside the air delivery shell.

[0010] Preferably, the air disturbing assembly includes a mixing chamber formed inside the gas mixing shell. An oxygen delivery pipe communicating with an oxygen cylinder is connected to the inside of the mixing chamber. A nitrogen delivery pipe communicating with a nitrogen cylinder is connected to the inside of the mixing chamber. A fan blade for promoting gas flow is provided inside the gas mixing shell. One end of the gas delivery pipe is connected to a gas distribution plate.

[0011] Preferably, a servo motor is fixedly connected to one end of the gas mixing shell. The output end of the servo motor extends into the gas mixing shell and is fixedly connected to an air vent connecting rod. The fan blade is fixedly connected to the outer surface of the air vent connecting rod. A rotating sleeve placed inside the mixing chamber is connected to the outer surface of the air vent connecting rod. A plurality of gas pushing plates are uniformly fixedly connected to the outer surface of the rotating sleeve. A gas stringing groove is formed on one side of the mixing chamber.

[0012] Preferably, a telescopic pipe communicating with the air vent limiting sleeve is connected to the inside of the gas delivery pipe. A plurality of purging pipes communicating with the inside of the air vent limiting sleeve are connected to the outer surface of the air vent limiting sleeve, and all the plurality of purging pipes face the polyethylene material.

[0013] Preferably, an empty pipe communicating with the mixing chamber is provided at the bottom of the gas mixing shell. A one-way valve is fixedly connected to the inside of the empty pipe. A plurality of oxygen discharging holes are formed on one side of the mixing chamber.

[0014] Preferably, a laser scanner is fixedly connected to the inside of the combustion chamber. A plurality of wax dripping scales for calculating the weight of the wax dripping generated by the combustion of the polyethylene material are provided inside the combustion chamber. A first guide rail is fixedly connected to the inside 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. A flue is communicated with the top of the combustion chamber, and a flue gas analyzer for detecting flue gas is fixedly connected to the inside of the flue.

[0015] The present invention also provides a flame retardancy detection method for producing a low-smoke flame-retardant polyethylene material, comprising the following steps: S1. During use, first place the polyethylene material in a plurality of jaws for fixation, and then operate the igniter to ignite the polyethylene material to detect its flame retardancy; S2. Subsequently, operate the pulling assembly to apply a pulling force to the polyethylene material to detect its combustion condition under pulling; S3. Turn on the environmental assembly to observe the combustion condition of the polyethylene material in an environment with different oxygen contents; S4. By turning on the gas disturbing assembly, the gas in the mixing chamber is mixed and discharged through the gas transmission pipe to purge the polyethylene material.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The combustion chamber integrates a laser scanner, a drip wax scale, a flue and a flue gas analyzer, which can synchronously monitor the combustion behavior, the weight of molten drips and the flue gas components, realize multi-parameter coupling analysis, apply a tensile force to the polyethylene material through the pulling assembly, simulate the material stress deformation scenario in an actual fire, evaluate its flame retardant stability under mechanical stress, fill the blank of traditional static tests, the first guide rail and the second guide rail form a biaxial moving platform, which can accurately adjust the spatial position of the igniter, realize directional ignition of different regions of the polyethylene material, reveal the local flame retardant performance differences of the material, drive the movable frame to displace through the sliding rod, switch the material from a vertical state to a horizontal state, verify the influence of different installation postures on flame spread, dripping behavior and flue gas release, the scissors can quickly shear the material to form multiple sections of specimens, cooperate with the movable igniter to realize synchronous ignition, the laser scanner synchronously monitors the combustion process of each section, compare and analyze the uniformity of the internal flame retardant distribution and local defects of the material, the flue gas analyzer is directly connected to the flue to capture the toxic components such as CO, CO2, and particulate matter in the combustion products in real time, combine with the data of the drip wax scale, through the functions of stretching, shearing and posture adjustment, reproduce the whole process behavior of the material from installation, stress to combustion, and evaluate its long-term safety under complex working conditions such as cable sheaths and building components.

[0017] 2. By switching the on-off of the oxygen cylinder, nitrogen cylinder and the outside air through a 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 an oxygen-rich to an oxygen-deficient environment, accurately simulating the combustion conditions at each stage of fire development. The servo motor drives the fan blade and the air-pushing plate to rotate synchronously. By adjusting the rotational speed, the gas turbulence intensity in the mixing chamber is changed. Combined with the dynamic exhaust of the oxygen release holes, the oxygen concentration and the wind speed are non-linearly 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, independent environmental control can be implemented for multiple sections of polyethylene materials after shearing, synchronously revealing the influence of the internal flame retardant distribution of the materials on the combustion characteristics. By switching the gas components at the moment of material shearing, the scenario where the material is exposed to different oxygen concentration environments after fracture in a fire can be simulated, and the secondary combustion risk after the damage of the flame retardant layer can be evaluated. By directly acting on the combustion surface through the purge pipe, the flame front morphology and the droplet trajectory are changed. The synchronously collected flue gas data can reveal the quantitative relationship between the oxygen concentration, the wind speed and the flue gas toxicity, providing a basis for toxicological evaluation. By changing the oxygen content in the mixing chamber, a high-oxygen concentration micro-region can be formed on the material surface to accelerate the pyrolysis reaction, which is used to evaluate the failure threshold of the flame retardant under local overheating conditions. And forming an oxygen-deficient region can simulate the afterglow combustion environment after the flame goes out, detecting the smoldering tendency and the re-ignition risk of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the first three-dimensional structural schematic diagram of the present invention; Figure 2 is the second three-dimensional structural schematic diagram of the present invention; Figure 3 is the sectional structural schematic diagram of the combustion chamber in the present invention; Figure 4 is the structural schematic diagram inside the combustion chamber in the present invention; Figure 5 is the structural schematic diagram of the ventilation limit sleeve in the present invention; Figure 6 is the structural schematic diagram of the oxygen cylinder in the present invention; Figure 7 is the sectional structural schematic diagram of the gas transmission shell in the present invention; Figure 8 is the structural schematic diagram of the fan blade in the present invention; Figure 9 is the structural schematic diagram of the gas leakage groove in the present invention; Figure 10 is the structural schematic diagram of the rotating sleeve in the present invention; Figure 11 is the structural schematic diagram of the sliding rod in the present invention.

[0019] 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 dropping scale; 200, positioning frame; 201, movable frame; 202, clamping jaw; 203, guide groove; 204, scissors; 205, ventilation limit sleeve; 206, connecting sleeve; 207, drive motor; 208, sliding rod; 209, torsion spring; 300, oxygen cylinder; 301, nitrogen cylinder; 302, atmosphere pipe; 303, air connection pipe; 304, three-way valve; 305, gas transmission shell; 306, axial fan; 400, gas mixing shell; 401, gas transmission pipe; 402, gas distribution plate; 403, servo motor; 404, telescopic pipe; 405, purging pipe; 406, mixing chamber; 407, gas leakage groove; 408, rotating sleeve; 409, gas pushing plate; 410, oxygen discharge hole; 411, ventilation connecting rod; 412, fan blade; 413, air pipe; 414, check valve; 415, oxygen transmission pipe; 416, nitrogen transmission pipe. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Embodiment 1: Please refer to Figures 1-3, the present invention provides a technical solution: a flame retardancy detection device for producing a low-smoke flame-retardant polyethylene material, including a combustion chamber 100 for performing a flame retardancy test on the polyethylene material 109, an igniter 108 for igniting the polyethylene material 109, and a mainframe 101 for analyzing the smoke generated by the combustion of the polyethylene material 109. A laser scanner 110 is fixedly connected inside the combustion chamber 100. A plurality of wax scales 111 for calculating the weight of the dripping wax generated by the combustion of the polyethylene material 109 are arranged inside the combustion chamber 100. A first guide rail 106 is fixedly connected inside 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. A flue 102 is communicated with the top of the combustion chamber 100, and a smoke analyzer 103 for detecting smoke is fixedly connected inside the flue 102. By setting the igniter 108, the polyethylene material 109 can be ignited to achieve flame retardancy detection. With the cooperation of the first guide rail 106 and the second guide rail 107, the polyethylene material 109 can be ignited at different positions, so as to achieve flame retardancy tests on different positions of the polyethylene material 109. And the smoke analyzer 103 can analyze the smoke generated by the combustion of the polyethylene material 109.

[0022] Please refer to Figures 4-6 and Figure 11 , further including a positioning frame 200, which is arranged inside the combustion chamber 100. Movable frames 201 are provided at both the top and the bottom thereof, and clamping jaws 202 for clamping the polyethylene material 109 are provided on one side of the positioning frame 200 and the movable frames 201. A pulling assembly for changing the position of the movable frame 201 is arranged inside the combustion chamber 100, and the pulling assembly can apply a dynamic tensile force to the polyethylene material 109. By setting the pulling assembly, the position of the movable frame 201 can be changed to adjust the position of the polyethylene material 109, so that it changes from the vertical direction to the horizontal direction for flame retardancy detection in different postures.

[0023] Among them, the pulling component includes two guide grooves 203 formed on the inner wall of the combustion chamber 100. The inner parts of the two guide grooves 203 are respectively slidably connected with sliding rods 208 connected to the two movable frames 201. A torsion spring 209 for driving the movable frame 201 to reset is sleeved on the outer surface of the sliding rod 208. A ventilation limit sleeve 205 capable of changing its own position is sleeved on the outer surfaces of the two sliding rods 208 together. A driving motor 207 is fixedly connected to one side of the combustion chamber 100. The middle end of the torsion spring 209 is fixedly connected with a connecting sleeve 206, and the output end of the driving motor 207 is fixedly connected with the connecting sleeve 206. Scissors 204 capable of cutting off the polyethylene material 109 are arranged at the top and bottom of the positioning frame 200. By setting the scissors 204, the polyethylene material 109 can be cut short to form multiple segments, and the ignition device 108 can be used to ignite respectively for synchronous flame retardancy testing. The combustion condition of multiple segments of polyethylene material 109 is 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 be misaligned. At this time, multiple clamping jaws 202 clamp the polyethylene material 109 synchronously, so that the reset force of the torsion spring 209 will continuously act on the movable frame 201 to apply a tensile force to the polyethylene material 109, so as to detect whether different flame retardant properties are generated under the influence of tensile force when the polyethylene material 109 is in a combustion state.

[0024] Specifically, when in use, first open the sliding door 105 and place the cylindrical polyethylene material 109 in the multiple clamping jaws 202 for fixation. Then close the sliding door 105 and operate the ignition device 108 to ignite the polyethylene material 109 to detect its combustion condition in the vertical state. In addition, the driving motor 207 can be operated to rotate to drive the ventilation limit sleeve 205 to rotate. The movement of the ventilation limit sleeve 205 will pull the sliding 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 on the same horizontal plane. At this time, under the action of the torsion spring 209, the polyethylene material 109 is subjected to a pulling force. Operate the ignition device 108 to ignite the polyethylene material 109 to detect its combustion condition under pulling. It is also possible to operate the scissors 204 to cut the polyethylene material 109 into multiple segments and conduct combustion tests respectively.

[0025] In summary, the combustion chamber 100 integrates a laser scanner 110, a wax dropping scale 111, a flue 102, and a flue gas analyzer 103, which can synchronously monitor the combustion behavior, the weight of molten droplets, and the flue gas components, realize multi-parameter coupling analysis, apply a tensile force to the polyethylene material 109 through a pulling component to simulate the stress and deformation scenario of the material in an actual fire, evaluate its flame retardant stability under mechanical stress, fill the gap in traditional static tests. The first guide rail 106 and the second guide rail 107 form a biaxial moving platform, which can accurately adjust the spatial position of the igniter 108 to achieve directional ignition of different regions of the polyethylene material 109, revealing the differences in local flame retardant performance of the material. The sliding rod 208 drives the displacement of the movable frame 201 to switch the material from a vertical state to a horizontal state, verifying the influence of different installation postures on flame spread, dripping behavior, and flue gas release. The scissors 204 can quickly cut the material into multiple sections of specimens, cooperate with the movable igniter 108 to achieve synchronous ignition, and the laser scanner 110 synchronously monitors the combustion process of each section to compare and analyze the uniformity of the flame retardant distribution and local defects inside the material. The flue gas analyzer 103 is directly connected to the flue 102 to capture in real-time the toxic components such as CO, CO2, and particulate matter in the combustion products. Combining the data of the wax dropping scale 111, through the functions of stretching, shearing, and posture adjustment, the whole process behavior of the material from installation, stress application to combustion is reproduced, and its long-term safety under complex working conditions such as cable sheaths and building components is evaluated.

[0026] Embodiment 2: Please refer to Figures 7-10 , the present invention also provides a technical solution. The difference from the technical solution of Embodiment 1 is: A flame retardant detection device for producing a low-smoke flame retardant polyethylene material further includes an oxygen cylinder 300, which stores oxygen inside, and a nitrogen cylinder 301 for storing nitrogen is provided on one side thereof. 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 the gas concentration is provided inside the atmosphere pipe 302, 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 inside the combustion chamber 100 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, heat release during combustion, and flue gas generation.

[0027] Among them, the environmental component includes an air-connecting 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-connecting pipe 303 and the atmosphere pipe 302. An air delivery shell 305 is arranged inside the atmosphere pipe 302, and an axial flow fan 306 for promoting gas flow is arranged inside the air delivery shell 305. By setting the three-way valve 304, the concentration of the gas entering the combustion chamber 100 can be adjusted. At the same time, it is worth mentioning that when the polyethylene material 109 is cut into multiple segments, 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 pipes 302 introduce oxygen and nitrogen respectively, so that the two atmosphere pipes 302 face two segments of the polyethylene material 109 respectively to observe its combustion state under different oxygen contents.

[0028] It further includes a gas mixing shell 400, which is used to mix gases to regulate the oxygen concentration. One end of it is connected with a gas delivery pipe 401 that is delivered into the combustion chamber 100. A gas disturbing component for promoting gas to blow the surface of the polyethylene material 109 is arranged inside the gas mixing shell 400. The oxygen concentration of the air in the gas delivery pipe 401 is adjusted according to the power of the gas disturbing component. By setting the gas disturbing component, the air flow can be promoted to blow the burning polyethylene material 109, and at the same time, the oxygen content and the wind speed can be adjusted to simulate the combustion conditions of the polyethylene material 109 under different wind speeds and oxygen contents.

[0029] Among them, the gas disturbing component includes a mixing chamber 406 opened inside the gas mixing shell 400. An oxygen delivery pipe 415 communicating with the oxygen cylinder 300 is connected to the inside of the mixing chamber 406. A nitrogen delivery pipe 416 communicating with the nitrogen cylinder 301 is connected to the inside of the mixing chamber 406. A fan blade 412 for promoting gas flow is arranged inside the gas mixing shell 400. One end of the gas delivery pipe 401 is connected with a gas distribution plate 402. A telescopic pipe 404 communicating with the ventilation limit sleeve 205 is connected to the inside of the gas delivery pipe 401. A plurality of purge pipes 405 communicating with the inside thereof are connected to the outer surface of the ventilation limit sleeve 205, and a plurality of purge pipes 405 all face the polyethylene material 109. By setting the oxygen delivery pipe 415 to introduce oxygen and the nitrogen delivery pipe 416 to introduce nitrogen, the two are mixed in the mixing chamber 406, and the fan blade 412 is provided to deliver the mixed gas into the gas delivery pipe 401 and then discharged by the plurality of purge pipes 405 to achieve the purging effect.

[0030] Furthermore, one end of the gas mixing housing 400 is fixedly connected to a servo motor 403. The output end of the servo motor 403 extends into the interior of the gas mixing housing 400 and is fixedly connected to a ventilation connecting rod 411. A 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 disposed inside the mixing chamber 406. A plurality of gas pushing plates 409 are uniformly fixedly connected to the outer surface of the rotating sleeve 408. A gas cross-flow groove 407 is formed on one side of the mixing chamber 406. An empty pipe 413 communicating with the mixing chamber 406 is disposed at the bottom of the gas mixing housing 400. A one-way valve 414 is fixedly connected inside the empty pipe 413. A plurality of oxygen discharge holes 410 are formed on one side of the mixing chamber 406. By setting the gas pushing plate 409 to rotate together with the rotation of the gas transmission pipe 401, as the rotational speed of the servo motor 403 increases, the fan blade 412 will generate a higher wind speed. At this time, the agitation of the gas pushing plate 409 will draw more gas from the nitrogen transmission pipe 416 and the oxygen transmission pipe 415. At this time, due to the setting of the gas cross-flow groove 407, when the gas pushing plate 409 rotates at a high speed, the gas drawn from the oxygen transmission pipe 415 and the empty pipe 413 will decrease, and the gas drawn from the nitrogen transmission pipe 416 will increase, thereby reducing the oxygen content of the gas transported by the fan blade 412. At the same time, a small amount of oxygen will be discharged through the oxygen discharge holes 410 under the high-speed rotation of the gas pushing plate 409.

[0031] Specifically, operate 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 transported gas, and under the action of the axial flow fan 306, the gas with different oxygen contents is blown onto different polyethylene materials 109 to observe their combustion conditions in environments with different oxygen contents. Subsequently, the three-way valve 304 can be closed to allow the gas to flow into the interior of the gas mixing housing 400. While igniting, the servo motor 403 is turned on to drive the fan blade 412 to rotate to form an air flow that is discharged through the gas transmission pipe 401. At this time, the rotation of the gas pushing plate 409 will mix the gas in the mixing chamber 406, and it is discharged through the purging pipe 405 to purge the surface of the polyethylene material 109. As the rotational speed of the servo motor 403 increases, the mixing ratio of the gas in the mixing chamber 406 will change, and the oxygen transmission value in the oxygen transmission pipe 415 will decrease.

[0032] 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.

[0033] 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: 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; 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; 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. S4. Re - fix the polyethylene material 109, or adjust its posture, or cut it again in the manner of S1 or S2 or S3. While igniting, turn on the servo - motor 403 to drive the fan blade 412 to rotate, forming an air flow that is discharged through the air - delivery pipe 401. At this time, the rotation of the air - pushing plate 409 will mix the gas in the mixing chamber 406, and the gas is discharged through the purging pipe 405 to purge the surface of the polyethylene material 109. As the rotational 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 - delivery pipe 415 will decrease.

[0034] It should be noted that in this text, relational terms such as "first" and "second" are only used 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 term "comprising", "including" or any other variant thereof is intended to cover non - exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0035] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flame retardancy detection device for producing a low-smoke flame retardant polyethylene material, comprising a combustion chamber (100) for performing a flame retardancy test on the polyethylene material (109), an igniter (108) for igniting the polyethylene material (109), and a main unit (101) for analyzing the smoke generated by the combustion of the polyethylene material (109), characterized in that, It further includes: A positioning frame (200) is arranged inside the combustion chamber (100). Movable frames (201) are provided at both the top and bottom thereof. Claws (202) for clamping the polyethylene material (109) are 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 arranged 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 inside. A nitrogen cylinder (301) for storing nitrogen is provided on one side thereof. Atmosphere pipes (302) extending into the combustion chamber (100) are connected to the bottoms of the oxygen cylinder (300) and the nitrogen cylinder (301). An environment component for adjusting the gas concentration is arranged inside the atmosphere pipe (302), and the environment component is used to simulate the flame retardant performance of the polyethylene material (109) under different gas environments; A gas mixing shell (400) is used for mixing gases to regulate the oxygen concentration. An air delivery pipe (401) leading to the inside of the combustion chamber (100) is connected to one end thereof. A gas disturbing component for pushing the gas to blow the surface of the polyethylene material (109) is arranged inside the gas mixing shell (400), and the oxygen concentration of the air in the air delivery pipe (401) is adjusted following the power of the gas disturbing component.

2. The flame retardancy detection device for producing low-smoke flame-retardant polyethylene materials according to claim 1, characterized in that: The pulling component includes two guide grooves (203) formed on the inner wall of the combustion chamber (100). Slide rods (208) connected to the two movable frames (201) are respectively slidably connected inside the two guide grooves (203). A torsion spring (209) for driving the movable frame (201) to reset is sleeved on the outer surface of the slide rod (208). A ventilation limit sleeve (205) capable of changing its own position is commonly sleeved on the outer surfaces of the two slide rods (208).

3. The flame retardancy detection device for producing low-smoke flame-retardant polyethylene materials according to claim 2, wherein: A driving motor (207) is fixedly connected to one side of the combustion chamber (100). The middle end of the torsion spring (209) is fixedly connected to a connecting sleeve (206), and the output end of the driving motor (207) is fixedly connected to the connecting sleeve (206). Scissors (204) capable of cutting the polyethylene material (109) are provided at both the top and bottom of the positioning frame (200).

4. The flame retardancy detection device for producing a low-smoke flame retardant polyethylene material according to claim 1, wherein: The environment component includes 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 arranged at the connection between the air connection pipe (303) and the atmosphere pipe (302). An air delivery shell (305) is arranged inside the atmosphere pipe (302), and an axial flow fan (306) for pushing the gas to flow is arranged inside the air delivery shell (305).

5. The flame retardancy detection device for producing a low-smoke flame retardant polyethylene material according to claim 1, characterized in that: The gas disturbing component includes a mixing chamber (406) formed inside the gas mixing shell (400). An oxygen delivery pipe (415) communicating with the oxygen cylinder (300) is connected to the inside of the mixing chamber (406). A nitrogen delivery pipe (416) communicating with the nitrogen cylinder (301) is connected to the inside of the mixing chamber (406). A fan blade (412) for pushing the gas to flow is arranged inside the gas mixing shell (400). A gas distribution plate (402) is connected to one end of the air delivery pipe (401).

6. The flame retardancy detection device for producing a low-smoke flame-retardant polyethylene material according to claim 5, wherein: One end of the gas mixing housing (400) is fixedly connected to a servo motor (403). The output end of the servo motor (403) extends into the gas mixing housing (400) and is fixedly connected to a ventilation connecting rod (411). A 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 a plurality of gas pushing plates (409) are uniformly fixedly connected to the outer surface of the rotating sleeve (408). A gas cross-flow groove (407) is formed on one side of the mixing chamber (406).

7. The flame retardancy detection device for producing a low-smoke flame-retardant polyethylene material according to claim 2, characterized in that: A telescopic pipe (404) communicating with the ventilation limiting sleeve (205) is connected to the inside of the gas transmission pipe (401). A plurality of purging pipes (405) communicating with the inside of the ventilation limiting sleeve (205) are connected to the outer surface of the ventilation limiting sleeve (205), and all the plurality of purging pipes (405) face the polyethylene material (109).

8. The flame retardancy detection device for producing a low-smoke flame retardant polyethylene material according to claim 6, characterized in that: An empty pipe (413) communicating with the mixing chamber (406) is arranged at the bottom of the gas mixing housing (400). A one-way valve (414) is fixedly connected to the inside of the empty pipe (413). A plurality of oxygen discharge holes (410) are formed on one side of the mixing chamber (406).

9. The flame retardancy detection device for producing low-smoke flame-retardant polyethylene materials according to claim 1, characterized in that: A laser scanner (110) is fixedly connected to the inside of the combustion chamber (100). A plurality of drip wax scales (111) for calculating the weight of the drip wax 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 inside 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). A flue (102) is communicated with the top of the combustion chamber (100), and a flue gas analyzer (103) for detecting flue gas is fixedly connected to the inside of the flue (102).

10. A flame retardancy detection method for the production of a low-smoke flame-retardant polyethylene material, according to any one of claims 1-9, a flame retardancy detection device for the production of a low-smoke flame-retardant polyethylene material, characterized in that, Including the following steps: S1. During use, first place the polyethylene material (109) in a plurality of clamping jaws (202) for fixation, and then operate the igniter (108) to ignite the polyethylene material (109) and detect its flame retardancy. S2. Then operate the pulling assembly to apply a pulling force to the polyethylene material (109) and detect its combustion condition under pulling. S3. Open the environment assembly to observe the combustion condition of the polyethylene material (109) in an environment with different oxygen contents. S4. By opening the gas disturbing assembly, the gas in the mixing chamber (406) is mixed and discharged through the gas transmission pipe (401) to purge the polyethylene material (109).

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