Material flame retardant performance testing device with adjustable clamping member and testing method

Abstract

This application provides a flame retardant performance testing device and method for materials with adjustable clamping components, relating to the field of flame retardant testing equipment. The testing device includes a base, a combustion chamber, a gas supply unit, and a clamping assembly. The base includes a base plate and a base sidewall. A receiving ring is provided on the inner wall of the base sidewall. The combustion chamber includes a cylinder body with an inlet and an outlet at its two ends, respectively, and the inlet abuts against the receiving ring. The gas supply unit includes a gas distribution plate and a gas source. The gas distribution plate is located between the receiving ring and the base plate and is connected to the gas source to supply gas into the combustion chamber. The clamping assembly can extend into the combustion chamber and includes multiple clamping units symmetrically arranged around the central axis of the combustion chamber. The multiple clamping units can move closer or further apart to clamp the test piece when they are close together, and the clamping units can drive the test piece to move up and down relative to the clamping units. This application has the advantages of high test result accuracy and the elimination of the need for frequent clamp cleaning.

Description

Technical Field

[0001] This application relates to the field of flame retardant testing equipment, and in particular to a material flame retardant performance testing device with adjustable clamps, and also to a material flame retardant performance testing method. Background Technology

[0002] Flame retardancy testing equipment is a device used to test the flame retardancy of materials. It generally includes a combustion chamber, a fixture, an ignition device, and a gas supply device. The gas supply device can blow gas with a stable oxygen content into the combustion chamber. The fixture is set in the combustion chamber to hold the test piece, and the ignition device can be used to ignite the test piece.

[0003] Cable filler materials generally include polypropylene and rubber, which are relatively easy to soften at high temperatures. Therefore, in existing technologies, the clamps used to hold cable filler materials are either made of metal sleeve structures or composed of multiple long metal rods or plates to clamp the entire length of the test piece. However, during the combustion process, the clamps remain in contact with the test piece. With sleeve-structure clamps, when the burning portion of the test piece is inside the sleeve structure, the carbon dioxide produced during combustion accumulates inside, slowing down the combustion rate and causing experimental errors. With clamps composed of multiple long metal rods or plates, when the burning portion of the test piece contacts the clamp, the good thermal conductivity of the metal rods or plates causes the coke produced during the combustion of the cable filler material to adhere to the clamp, preventing complete combustion and requiring frequent clamp cleaning.

[0004] Therefore, there is a need for a material flame retardancy testing device with adjustable clamps. Summary of the Invention

[0005] To address the issues of potential experimental errors and the need for frequent fixture cleaning, this application provides a material flame retardant performance testing device and method with adjustable clamping components.

[0006] The first aspect of this application provides a material flame retardant performance testing device with adjustable clamping components, which adopts the following technical solution: A material flame retardant performance testing device with adjustable clamping components includes a base, a combustion cylinder, a gas supply unit, and a clamping assembly. The base includes a base plate and a base side wall disposed on the base plate. A receiving ring is provided on the inner wall of the base side wall. The combustion cylinder includes a cylinder body, with an air inlet and an air outlet at both ends of the cylinder body, and the air inlet abuts against the receiving ring. The gas supply unit includes a gas equalization plate and a gas source. The gas equalization plate is disposed between the receiving ring and the base plate and is connected to the gas source to supply gas into the combustion cylinder.

[0007] The clamping assembly can extend into the combustion chamber. The clamping assembly includes multiple clamping units, which are symmetrically arranged around the central axis of the combustion chamber. The multiple clamping units can move closer to or further away from each other so that the test piece can be clamped when the multiple clamping units are close to each other. The clamping units can drive the test piece to move up and down relative to the clamping units so that the burning part on the test piece does not come into contact with the clamping assembly.

[0008] By adopting the above technical solution, a relatively closed combustion chamber can be formed between the combustion cylinder and the base after they are connected. The gas supply unit is located between the receiving ring and the base plate and can supply gas into the combustion chamber, so that the exhaust gas generated during the combustion of the test piece can be discharged from the combustion chamber in a timely manner, thereby ensuring that the oxygen content in the combustion chamber is relatively stable and the combustion rate of the test piece is not prone to fluctuation, thus reducing the impact on the experimental accuracy. In addition, since the clamping unit can drive the test piece to move up and down relative to the clamping unit, when the burning part of the test piece is about to contact the clamping unit, the clamping unit will drive the test piece to move up and down so that the burning part of the test piece does not contact the clamping assembly. This makes it difficult for the coke generated during the combustion of the test piece to adhere to the clamping assembly, thereby eliminating the need for frequent cleaning of the clamping assembly.

[0009] Furthermore, each of the clamping units includes a column, a support rod, a rotating wheel, and a driving component. One end of the column is connected to the ground, and the other end is provided with a connecting ring. The support rod passes through the connecting ring and can move within the connecting ring. The connecting ring is provided with a threaded hole, through which a bolt can pass and abut against the support rod passing through the connecting ring. A through hole is provided on the side wall of the combustion cylinder, suitable for the support rod to pass through. The support rod passes through the through hole and enters the combustion cylinder. The rotating wheel is provided at one end of the support rod inside the combustion cylinder. The rotating wheel is connected to the driving component, and the axial direction of the rotating shaft of the rotating wheel is parallel to the horizontal direction.

[0010] By adopting the above technical solution, the movement of the support rod in the connecting ring can make the rotating wheels on multiple clamping units move closer or further apart, thereby adapting to test pieces of different sizes. After the support rod is moved and adjusted to the correct position, a bolt can be used to pass through the threaded hole and abut against the support rod inserted in the connecting ring to achieve a fixed connection between the support rod and the connecting ring, thereby achieving the clamping of the clamping assembly.

[0011] Furthermore, the driving component includes a drive motor, a drive worm, and a drive gear. The drive gear is coaxially arranged with the rotating wheel. The drive worm is rotatably mounted on the support rod. One end of the drive worm meshes with the drive gear, and the other end of the drive worm passes through the through hole into the combustion chamber and is connected to the drive motor located on a section of the support rod outside the combustion chamber.

[0012] By adopting the above technical solution, the drive motor can drive the drive worm to rotate, which in turn drives the drive gear to rotate, thereby realizing the rotation of the rotating wheel. Moreover, the worm gear transmission method can make the rotation adjustment of the rotating wheel more precise.

[0013] Furthermore, the clamping assembly also includes a first sensor, a second sensor, and a controller. The first sensor and the second sensor are both communicatively connected to the controller, and the controller is also electrically connected to the drive motor. The first sensor and the second sensor are both fixedly connected to the combustion cylinder. The first sensor is located below the second sensor, and both the first sensor and the second sensor are adapted to detect whether the test piece exists at their respective heights. When the first sensor does not detect the test piece, the controller controls the drive motor to rotate, thereby driving the rotating wheel to move the test piece upward. When the second sensor detects the test piece, the controller controls the drive motor to stop rotating.

[0014] By adopting the above technical solution, the position of the burning part on the test piece can be detected by the first sensor and the second sensor. This allows the drive motor to be started when the distance between the burning part and the rotating wheel is small, so that the rotating wheel moves the test piece and the burning part on the test piece away from the rotating wheel. This makes it less likely for the charred material of the burning part to adhere to the rotating wheel. In addition, the second sensor can prevent the part of the test piece that is not clamped and fixed from being too long, which could cause the part to bend and sag and ignite other parts of the test piece.

[0015] Furthermore, an air guide plate is provided on the inner wall of the cylinder at a position corresponding to the rotating wheel, and the air guide plate is inclined from bottom to top toward the central axis of the combustion cylinder.

[0016] By adopting the above technical solution, the airflow can be directed to the burning part of the test piece, thereby reducing the obstruction of airflow by the clamping component and causing inaccurate experimental data.

[0017] Furthermore, the diameter of the air inlet is larger than the diameter of the air outlet.

[0018] By adopting the above technical solution, the smaller diameter of the exhaust end can effectively prevent gases with low oxygen content from flowing back into the combustion chamber, thereby reducing the impact on the accuracy of the experiment.

[0019] Furthermore, the gas supply unit also includes a gas supply pipe, one end of which is connected to the gas source and the other end of which is connected to the gas equalization plate. A through hole is provided on the side wall of the base, through which the gas supply pipe can pass and connect to the gas equalization plate disposed between the base plate and the receiving ring. The gas equalization plate has a plurality of gas equalization holes on the side facing the receiving ring.

[0020] By adopting the above technical solution, the gas output can be made more uniform, thereby ensuring that the combustion rate is consistent throughout the test piece.

[0021] Furthermore, the gas equalization plate is formed by winding a gas equalization tube, the air inlet end of the gas equalization tube is connected to the air supply tube, the end of the gas equalization tube is closed, and a plurality of gas equalization holes are provided on the portion of the gas equalization tube facing the receiving ring, and the diameter of the gas equalization holes gradually increases from the air inlet end to the end.

[0022] By adopting the above technical solution, the air output of the air distribution plate can be made more uniform.

[0023] Furthermore, the gas supply unit also includes a barrier net, which is disposed between the receiving ring and the combustion cylinder; the gas source includes a nitrogen tank and an oxygen tank, and the outlet pipes of the nitrogen tank and the oxygen tank are connected to the gas supply pipe via a manifold valve.

[0024] By adopting the above technical solution, the oxygen content of the gas supplied into the combustion chamber can be adjusted, and the barrier net can prevent the test piece from falling onto the gas equalization plate and clogging it.

[0025] The second aspect of this application provides a method for testing the flame retardant properties of a material, which employs the following technical solution: A method for testing the flame retardant properties of a material, implemented using a material flame retardant performance testing device with an adjustable clamp as described above, includes the following steps:

[0026] S1. Cut a section of the sample and divide the sample into several equal sections to obtain a test piece;

[0027] S2. Adjust the clamping assembly to clamp the test piece onto the clamping assembly;

[0028] S3. Turn on the gas source and adjust the oxygen content in the gas source. After the oxygen content is adjusted, continuously supply gas into the combustion chamber.

[0029] S4. After the set gas supply time is reached, the lowest part of the flame generated by the igniter is applied to the top surface of the test piece to ignite the test piece.

[0030] S5. Observe the combustion of the test piece to obtain the flame retardant performance of the test piece.

[0031] Since this method uses a material flame retardant performance testing device with adjustable clamping element from the above-mentioned technical solution, it also has all the technical effects of the aforementioned material flame retardant performance testing device with adjustable clamping element.

[0032] In summary, this application includes at least one of the following beneficial effects:

[0033] After the combustion cylinder is connected to the base, a relatively closed combustion chamber can be formed between the two. The gas supply unit is located between the receiving ring and the base plate and can supply gas into the combustion chamber, so that the exhaust gas generated during the combustion of the test piece can be discharged from the combustion chamber in a timely manner, ensuring that the oxygen content in the combustion chamber is relatively stable. This makes it less likely for the combustion rate of the test piece to fluctuate, thereby reducing the impact on experimental accuracy. In addition, since the clamping unit can drive the test piece to move up and down relative to the clamping unit, when the burning part of the test piece is about to contact the clamping unit, the clamping unit will drive the test piece to move up and down so that the burning part of the test piece does not contact the clamping assembly. This makes it less likely for the coke generated during the combustion of the test piece to adhere to the clamping assembly, thus eliminating the need for frequent cleaning of the clamping assembly. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of a material flame retardant performance testing device with adjustable clamping elements according to this application;

[0035] Figure 2 This is a perspective view of a portion of the structure of the base, combustion cylinder, clamping assembly, and gas supply unit in a material flame retardant performance testing device with adjustable clamping components according to this application.

[0036] Figure 3 This is a top view of a portion of the structure of the base, combustion cylinder, clamping assembly, and gas supply unit in a material flame retardant performance testing device with adjustable clamping components according to this application.

[0037] Figure 4 yes Figure 3 A cross-sectional view along the AA direction, showing the test piece in an unclamped state;

[0038] Figure 5 yes Figure 4 Enlarged view of region B in the middle;

[0039] Figure 6 yes Figure 4 Enlarged view of region C in the middle;

[0040] Figure 7 yes Figure 4 A cross-sectional view along the DD direction.

[0041] Explanation of reference numerals in the attached drawings: 1. Base; 11. Base plate; 12. Base side wall; 121. Receiving ring; 2. Combustion cylinder; 21. Cylinder body; 211. Air inlet; 212. Air outlet; 213. Air guide plate; 3. Air supply unit; 31. Air distribution plate; 311. Air distribution hole; 32. Air source; 33. Air supply pipe; 34. Barrier net; 4. Clamping assembly; 41. Column; 411. Connecting ring; 42. Support rod; 43. Rotating wheel; 44. Drive motor; 45. Drive worm gear; 46. Drive gear; 47. First sensor; 48. Second sensor; 49. Controller; 5. Test piece; 6. Combustion cabinet; 7. Flue gas collection pipe. Detailed Implementation

[0042] Figure 1 This is a schematic diagram of the overall structure of a material flame retardant performance testing device with adjustable clamping elements according to this application. Figure 2 This is a perspective view of a portion of the structure of the base, combustion chamber, clamping assembly, and gas supply unit in a material flame retardant performance testing device with adjustable clamping components according to this application. See also... Figure 1 and Figure 2 The first aspect of this application provides a material flame retardant performance testing device with adjustable clamping components, which includes a base 1, a combustion cylinder 2, a gas supply unit 3, and a clamping assembly 4. The base 1 and the combustion cylinder 2 in the material flame retardant performance testing device with adjustable clamping components can be set in a combustion chamber 6, and a flue gas collection pipe 7 can be connected to the combustion chamber 6 to facilitate the collection and treatment of the gas generated after combustion, thereby reducing damage to the environment.

[0043] Figure 3 This is a top view of a portion of the structure of the base, combustion chamber, clamping assembly, and gas supply unit in a material flame retardant performance testing device with adjustable clamping components according to this application. Figure 4 yes Figure 3 A cross-sectional view along the AA direction, showing the test piece in an unclamped state. See [reference needed]. Figure 3 and Figure 4The base 1 includes a base plate 11 and a base side wall 12 disposed on the base plate 11. Both the base plate 11 and the base side wall 12 can be made of iron to have fire resistance. A receiving ring 121 is provided on the inner wall of the base side wall 12. The combustion cylinder 2 includes a cylinder 21 with an air inlet 211 and an air outlet 212 at its two ends, respectively. The air inlet 211 abuts against the receiving ring 121. The gas supply unit 3 includes a gas equalization plate 31 and a gas source 32. The gas equalization plate 31 is disposed between the receiving ring 121 and the base plate 11 and is connected to the gas source 32 to supply gas to the combustion cylinder 2. The cylinder 21 of the combustion cylinder 2 can also be made of iron to have fire resistance. The base plate 11 and the base side wall 12 can be connected by a detachable method such as screw connection to facilitate the disassembly, maintenance and replacement of the gas supply unit 3 disposed between the receiving ring 121 and the base plate 11.

[0044] The clamping assembly 4 can extend into the combustion cylinder 2. The clamping assembly 4 can be configured to include multiple clamping units, for example, at least three. The three clamping units are symmetrically arranged around the central axis of the combustion cylinder 2, and the clamping units can move closer or further away from each other so that the test piece 5 can be clamped when the multiple clamping units are close to each other. The clamping units can drive the test piece 5 to move up and down relative to the clamping units so that the burning part on the test piece 5 does not contact the clamping assembly 4.

[0045] The above structural design allows the combustion chamber 2 and the base 1 to form a relatively closed combustion chamber after they are connected. The gas supply unit 3, located between the receiving ring 121 and the base plate 11, can supply gas into the combustion chamber, ensuring that the exhaust gas generated during the combustion of the test piece 5 can be discharged from the combustion chamber in a timely manner. This ensures that the oxygen content in the combustion chamber is relatively stable, making it less likely for the combustion rate of the test piece 5 to fluctuate, thereby reducing the impact on experimental accuracy. In addition, since the clamping unit can drive the test piece 5 to move up and down relative to the clamping unit, when the burning part of the test piece 5 is about to contact the clamping unit, the clamping unit will drive the test piece 5 to move up and down, so that the burning part of the test piece 5 does not contact the clamping assembly 4. This makes it less likely for the coke generated during the combustion of the test piece 5 to adhere to the clamping assembly 4, thus eliminating the need for frequent cleaning of the clamping assembly 4.

[0046] Figure 5 yes Figure 4 Enlarged view of region B in the middle. Figure 6 yes Figure 4 See the enlarged view of region C in the middle. Figure 5 and Figure 6Each clamping unit can be specifically configured to include a column 41, a support rod 42, a rotating wheel 43, and a driving component. One end of the column 41 is connected to the ground, and the other end is provided with a connecting ring 411. The support rod 42 can pass through the connecting ring 411 and can move within the connecting ring 411. The connecting ring 411 also needs to be provided with a threaded hole so that the bolt can pass through the threaded hole and abut against the support rod 42 passing through the connecting ring 411 to fix the support rod 42. A through hole suitable for the support rod 42 to pass through is opened on the side wall of the combustion cylinder 2. The support rod 42 passes through the through hole and enters the combustion cylinder 2. The end of the support rod 42 inside the combustion cylinder 2 is provided with a rotating wheel 43. The rotating wheel 43 is connected to the driving component for transmission, and the axial direction of the rotating shaft of the rotating wheel 43 is parallel to the horizontal direction.

[0047] Based on the above structural design, the clamping unit can move the rotating wheels 43 on multiple clamping units closer to or further away from each other by moving the support rod 42 in the connecting ring 411, thereby adapting to test pieces 5 of different sizes. After the support rod 42 is moved and adjusted to the position, a bolt can be used to pass through the threaded hole and abut against the support rod 42 that passes through the connecting ring 411 to achieve a fixed connection between the support rod 42 and the connecting ring 411, thereby achieving the clamping of the clamping assembly 4.

[0048] like Figure 5 and Figure 6 As shown, the driving component can be configured to include a drive motor 44, a drive worm 45, and a drive gear 46. The drive gear 46 is coaxially arranged with the rotating wheel 43. The drive worm 45 is rotatably mounted on the support rod 42. One end of the drive worm 45 meshes with the drive gear 46, and the other end of the drive worm 45 passes through the through hole into the combustion chamber 2 and is connected to the drive motor 44, which is mounted on the section of the support rod 42 outside the combustion chamber 2. It should be noted that the drive motor 44 should be positioned between the combustion chamber 2 and the connecting ring 411, and the drive worm... Only a threaded structure needs to be provided on the rod 45 at the position where it meshes with the drive gear 46; the aforementioned drive motor 44 can drive the drive worm 45 to rotate, thereby driving the drive gear 46 to rotate, which in turn drives the rotating wheel 43 fixed on the same axis to rotate, and realizes the up and down movement of the test piece 5 relative to the clamping unit. It can be understood that the ignition point of the test piece 5 should be located at the upper end of the test piece 5, so that the flame of the test piece 5 is not easy to contact the clamping component 4 when it is burning, thereby making the clamping component 4 less likely to be damaged.

[0049] like Figure 2 and Figure 4As shown, the clamping assembly 4 also includes a first sensor 47, a second sensor 48, and a controller 49. The first sensor 47 and the second sensor 48 are both communicatively connected to the controller 49, and the controller 49 is also electrically connected to the drive motor 44. The first sensor 47 and the second sensor 48 are both fixedly connected to the combustion cylinder 2. The first sensor 47 is located below the second sensor 48, and both the first sensor 47 and the second sensor 48 are adapted to detect whether the test piece 5 exists at their respective heights. When the first sensor 47 does not detect the test piece 5, the controller 49 controls the drive motor 44 to rotate, so as to drive the rotating wheel 43 to move the test piece 5 upward. When the second sensor 48 detects the test piece 5, the controller 49 controls the drive motor 44 to stop rotating.

[0050] Both the first sensor 47 and the second sensor 48 can be laser sensors, which can emit lasers to determine whether there is an object at a set distance from the laser sensor by measuring the time it takes for the laser to hit the surface of the object and reflect back to the laser sensor. Thus, the first sensor 47 and the second sensor 48 can detect the position of the burning part on the test piece 5, so that when the distance between the burning part and the rotating wheel 43 is small, the drive motor 44 can be activated to make the rotating wheel 43 move the test piece 5, so that the burning part on the test piece 5 is away from the rotating wheel 43, making it less likely for the charred parts of the burning part to adhere to the rotating wheel 43. In addition, the setting of the second sensor 48 can prevent the part of the test piece 5 that is not clamped and fixed from being too long, causing that part to bend and sag, igniting other parts of the test piece 5.

[0051] Specifically, when the first sensor 47 fails to detect the test piece 5, it means that the burning part on the test piece 5 is about to come into contact with the rotating wheel 43. Therefore, the drive motor 44 needs to be started to make the rotating wheel 43 move the test piece 5 so that the burning part on the test piece 5 moves away from the rotating wheel 43 until it moves to the second sensor 48, which detects the test piece 5 and controls the drive motor 44 to stop, so that the test piece 5 stops moving.

[0052] like Figure 4 As shown, an air guide plate 213 is provided on the inner wall of the cylinder 21 at a position corresponding to the rotating wheel 43. The air guide plate 213 is inclined from bottom to top towards the central axis of the combustion cylinder 2, so as to guide the airflow to the combustion part on the test piece 5, thereby reducing the obstruction of the airflow by the clamping assembly 4 and causing inaccurate experimental data.

[0053] like Figure 4As shown, the diameter of the air inlet 211 is larger than the diameter of the air outlet 212. Specifically, the air outlet 212 can be set as a constricted structure, so that the diameter of the air outlet 212 is one-third to one-half of the diameter of the air inlet 211. This ensures that the air outlet 212 can exhaust smoothly while effectively preventing the backflow of gas with low oxygen content from the outside into the combustion chamber, thereby reducing the impact on the accuracy of the experiment.

[0054] Figure 7 yes Figure 4 A cross-sectional view along the DD direction, such as Figure 2 and Figure 7 As shown, the gas supply unit 3 also includes a gas supply pipe 33. One end of the gas supply pipe 33 is connected to the gas source 32, and the other end is connected to the gas equalization plate 31. A through hole is provided on the side wall 12 of the base so that the gas supply pipe 33 can pass through the through hole and connect to the gas equalization plate 31 set between the base plate 11 and the receiving ring 121. The gas equalization plate 31 can be configured to be formed by coiling the gas equalization pipe. The air inlet end 211 of the gas equalization pipe is connected to the gas supply pipe 33, and the end of the gas equalization pipe is closed. Multiple gas equalization holes 311 need to be provided on the part of the gas equalization pipe facing the receiving ring 121. The diameter of the gas equalization holes 311 gradually increases from the air inlet end 211 to the end, so that the gas output at each gas equalization hole 311 on the gas equalization plate 31 is more uniform, thereby making the combustion speed of the test piece 5 consistent.

[0055] like Figure 2 and Figure 4 As shown, the gas supply unit 3 also includes a barrier net 34, which can be a metal mesh plate. It is located between the receiving ring 121 and the combustion cylinder 2 to prevent the test piece 5 from falling onto the gas equalization plate 31 and clogging it. The gas source 32 can be specifically configured to include a nitrogen tank and an oxygen tank. The outlet pipes of the nitrogen tank and the oxygen tank are connected to the gas supply pipe 33 via a manifold valve. It can be understood that the manifold valve can be integrated with the controller 49, and the opening and closing valves of the nitrogen tank and the oxygen tank can also be integrated with the controller 49. Corresponding pressure gauges and flow meters can be installed on the outlet pipes of the nitrogen tank and the oxygen tank respectively to facilitate monitoring of gas pressure and flow rate, and to facilitate adjustment of gas pressure and flow rate to appropriate values.

[0056] The second aspect of this application also provides a method for testing the flame retardant properties of materials. This method utilizes the aforementioned material flame retardant performance testing equipment with adjustable clamps. The solid-state steps of this method include:

[0057] S1. Take a sample from the cable that has passed the appearance inspection, divide the sample into three equal parts, and set the length of each part to 100mm to obtain three test pieces 5 with a length of 100mm.

[0058] S2. Adjust the clamping assembly 4 to clamp the test piece 5 onto the clamping assembly 4.

[0059] S3. Turn on the gas source 32 and adjust the oxygen content in the gas source 32, for example, to 21%. After the oxygen content is adjusted, continuously supply gas to the combustion chamber 2 to ensure that the oxygen content in the combustion chamber 2 can be stabilized at the set value.

[0060] S4. After the set gas supply time is reached, the lowest part of the flame generated by the igniter (flame gun) is applied to the top surface of the test piece 5 to ignite the test piece 5. The total duration of the flame applied to the top surface of the test piece 5 during ignition can be set to 30 seconds, and the flame is removed once every 5 seconds. If the test piece 5 has been ignited after the flame is removed, the flame will not be applied again. If the total duration of the flame application reaches 30 seconds but the test piece 5 still cannot be ignited, the flame will not be applied again.

[0061] S5. Observe the combustion of the test piece 5 to obtain the flame retardant performance of the test piece 5. Specifically, if the total duration of the applied flame reaches 30 seconds but the test piece 5 still cannot be ignited, or if the test piece 5 is ignited and then immediately extinguishes, the flame retardant ability of the test piece 5 meets the standard. If the time from ignition to natural extinguishing of a 100mm long test piece 5 is less than 3 minutes and the length of the burn damage is less than 50mm, the flame retardant ability of the test piece 5 meets the standard. If the time from ignition to natural extinguishing of a 100mm long test piece 5 is greater than or equal to 3 minutes or the length of the burn damage is greater than or equal to 50mm, the flame retardant ability of the test piece 5 does not meet the standard.

[0062] The working principle of the material flame retardant performance testing device with adjustable clamp in this application is as follows:

[0063] After the combustion cylinder 2 is connected to the base 1, a relatively closed combustion chamber can be formed between the two. The gas supply unit 3 is located between the receiving ring 121 and the base plate 11 and can supply gas into the combustion chamber, so that the exhaust gas generated during the combustion of the test piece 5 can be discharged from the combustion chamber in a timely manner, so as to ensure that the oxygen content in the combustion chamber is relatively stable and the combustion speed of the test piece 5 is not prone to fluctuation, thereby reducing the impact on the experimental accuracy. In addition, since the clamping unit can drive the test piece 5 to move up and down relative to the clamping unit, when the burning part on the test piece 5 is about to contact the clamping unit, the clamping unit will drive the test piece 5 to move up and down so that the burning part on the test piece 5 does not contact the clamping assembly 4. This makes it difficult for the coke generated during the combustion of the test piece 5 to adhere to the clamping assembly 4, thereby eliminating the need for frequent cleaning of the clamping assembly 4.

[0064] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A material flame retardant performance testing device with adjustable clamping elements, characterized in that, The device includes a base (1), a combustion cylinder (2), an air supply unit (3), and a clamping assembly (4). The base (1) includes a base plate (11) and a base side wall (12) provided on the base plate (11). A receiving ring (121) is provided on the inner wall of the base side wall (12). The combustion cylinder (2) includes a cylinder body (21). The two ends of the cylinder body (21) are an air inlet end (211) and an air outlet end (212), respectively. The air inlet end (211) abuts against the receiving ring (121). The air supply unit (3) includes an air distribution plate (31) and an air source (32). The air distribution plate (31) is located between the receiving ring (121) and the base plate (11) and is connected to the air source (32) to supply air to the combustion cylinder (2). The clamping assembly (4) can extend into the combustion cylinder (2). The clamping assembly (4) includes multiple clamping units. The multiple clamping units are symmetrically arranged around the central axis of the combustion cylinder (2). The multiple clamping units can move closer to each other or further away from each other so that the test piece (5) can be clamped when the multiple clamping units move closer to each other. The clamping unit can drive the test piece (5) to move up and down relative to the clamping unit so that the burning part on the test piece (5) does not contact the clamping assembly (4). Each clamping unit includes a column (41), a support rod (42), a rotating wheel (43), and a driving component. One end of the column (41) is connected to the ground, and the other end is provided with a connecting ring (411). The support rod (42) passes through the connecting ring (411) and can move within the connecting ring (411). The connecting ring (411) is provided with a threaded hole, through which a bolt can pass and abut against the support rod (42) passing through the connecting ring (411). The side wall of the combustion cylinder (2) is provided with a through hole suitable for the support rod (42) to pass through. The support rod (42) passes through the through hole and enters the combustion cylinder (2). The end of the support rod (42) inside the combustion cylinder (2) is provided with the rotating wheel (43). The rotating wheel (43) is connected to the driving component, and the axial direction of the rotating shaft of the rotating wheel (43) is parallel to the horizontal direction. The driving component includes a drive motor (44), a drive worm (45), and a drive gear (46). The drive gear (46) is coaxially arranged with the rotating wheel (43). The drive worm (45) is rotatably arranged on the support rod (42). One end of the drive worm (45) meshes with the drive gear (46), and the other end of the drive worm (45) passes through the through hole into the combustion chamber (2) and is connected to the drive motor (44) located on a section of the support rod (42) outside the combustion chamber (2).

2. The material flame retardant performance testing device with adjustable clamping element according to claim 1, characterized in that: The clamping assembly (4) further includes a first sensor (47), a second sensor (48), and a controller (49). The first sensor (47) and the second sensor (48) are both communicatively connected to the controller (49), and the controller (49) is also electrically connected to the drive motor (44). The first sensor (47) and the second sensor (48) are both fixedly connected to the combustion cylinder (2). The first sensor (47) is located below the second sensor (48), and both the first sensor (47) and the second sensor (48) are adapted to detect whether the test piece (5) exists at their respective heights. When the first sensor (47) does not detect the test piece (5), the controller (49) controls the drive motor (44) to rotate, so as to drive the rotating wheel (43) to move the test piece (5) upward. When the second sensor (48) detects the test piece (5), the controller (49) controls the drive motor (44) to stop rotating.

3. The material flame retardant performance testing device with adjustable clamping element according to claim 2, characterized in that: A guide plate (213) is provided on the inner wall of the cylinder (21) at a position corresponding to the rotating wheel. The guide plate (213) is inclined from bottom to top toward the central axis of the combustion cylinder (2).

4. A material flame retardant performance testing device with an adjustable clamping element according to any one of claims 1 to 3, characterized in that: The diameter of the air inlet (211) is larger than the diameter of the air outlet (212).

5. A material flame retardant performance testing device with adjustable clamping element according to claim 4, characterized in that: The gas supply unit (3) also includes a gas supply pipe (33), one end of which is connected to the gas source (32) and the other end is connected to the gas equalization plate (31). A through hole is provided on the side wall (12) of the base. The gas supply pipe (33) can pass through the through hole and connect to the gas equalization plate (31) located between the base plate (11) and the receiving ring (121). The gas equalization plate (31) has a plurality of gas equalization holes (311) on the side facing the receiving ring (121).

6. The material flame retardant performance testing device with adjustable clamping element according to claim 5, characterized in that: The equalization plate (31) is formed by winding an equalization tube. The air inlet end of the equalization tube is connected to the air supply tube (33). The end of the equalization tube is closed. The portion of the equalization tube facing the receiving ring (121) is provided with a plurality of equalization holes (311). The diameter of the equalization holes (311) gradually increases from the air inlet end to the end end.

7. A material flame retardant performance testing device with adjustable clamping element according to claim 5, characterized in that: The gas supply unit (3) also includes a barrier net (34), which is located between the receiving ring (121) and the combustion cylinder (2); the gas source (32) includes a nitrogen tank and an oxygen tank, and the outlet pipes of the nitrogen tank and the oxygen tank are connected to the gas supply pipe (33) via a manifold valve.

8. A method for testing the flame retardant properties of materials, implemented using the material flame retardant performance testing equipment with adjustable clamping elements as described in any one of claims 1 to 7, characterized in that... Includes the following steps: S1. Cut a section of the sample and divide the sample into several segments to obtain the test piece (5). S2. Adjust the clamping assembly (4) to clamp the test piece (5) onto the clamping assembly (4); S3. Turn on the gas source (32) and adjust the oxygen content in the gas source (32). After the oxygen content is adjusted, continuously supply gas to the combustion cylinder (2). S4. After the set gas supply time is reached, the lowest part of the flame generated by the igniter is applied to the top surface of the test piece (5) to ignite the test piece (5). S5. Observe the combustion of the test piece (5) to obtain the flame retardant performance of the test piece (5).

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