A testing device and testing method for the fire prevention performance of a tire

Abstract

The present invention relates to a test device for the fire prevention performance of a tire, which includes a box body with an air flow hood provided on its side wall; a fire door; a carbon dioxide gas storage tank, which is arranged outside the box body and is connected to the air flow hood inside the box body through pipe fittings, and a pressure gauge and a flow switch are arranged on the pipe fittings; a ventilation window; a filter screen, which is arranged at a position flush with the ventilation window on the inner wall of the box body, and a conveyor belt is fixedly connected between the filter screen and the air flow hood; a measurement window and a viewing window are arranged on the same side wall of the box body, an infrared thermometer is arranged outside the measurement window, and a high-definition camera is arranged outside the viewing window; a sliding window is opened on the side wall of the box body, and a smoke sensor is arranged obliquely above it; a high-temperature electronic scale is arranged at the bottom of the box body and is connected to a computer through a data line; a K-type thermocouple. The test device for the fire prevention performance of the tire of the present invention can simulate the heat receiving conditions of each part during the operation of the tire by setting a high-definition camera and a K-type thermocouple, and the test data is accurate.

Description

Technical Field

[0001] The present invention belongs to the technical field of flame retardancy testing, and particularly relates to a testing device and a testing method for the fire prevention performance of tires. Background Art

[0002] The spontaneous combustion of automobile tires, as a form of road traffic accidents, is not easily detected before the accident. If the rescue opportunity is missed when the accident occurs, very serious consequences are likely to occur. In order to avoid this phenomenon, tire enterprises have developed flame retardant tires. Such flame retardant tires use flame retardant materials in the selection of tire materials to make the tires not easily ignited and self-extinguish when the fire source is removed; in terms of tread design, by optimizing the tread structure, heat dissipation is improved and vibration is reduced to lower the heat generation of the tires during vehicle operation.

[0003] Currently, in order to test the flame retardant performance of tires, the national standard GB / T 40717-2021 provides two testing methods, placing the tire vertically and spraying a blowtorch at the marked point; sampling and testing the test points of the tire. However, the above testing methods have the following deficiencies: only the combustion performance of the tire rubber is tested, and the influence of the tread and structural design on the tire flame retardant performance is not considered; the test results are manually recorded and are prone to deviation; the testing process is all static detection, and the combustion situation of the tire during vehicle driving is not simulated to determine the flammable parts; there are safety hazards in the open flame spraying.

[0004] Moreover, when a tire is in use with inflation, once it catches fire, it is easy to make the tire wall thinner, and the gas inside the tire expands due to heat, and it is easy to explode. Based on this, providing a safe device for detecting the fire prevention performance of tires is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] Aiming at the deficiencies in the related technologies, the present invention provides a testing device for the fire prevention performance of tires, with a safe testing process, accurate testing data, and can test the fire prevention performance of tires in both dynamic and static situations.

[0006] The present invention provides a testing device for the fire prevention performance of tires, including:

[0007] A box body, on the side wall of which an air flow hood is arranged;

[0008] A fireproof door, arranged on one side of the box body, with a door handle thereon;

[0009] A carbon dioxide gas storage tank, arranged outside the box body, connected to the air flow hood inside the box body through a pipe fitting, and a pressure gauge and a flow switch are arranged on the pipe fitting;

[0010] A ventilation window, arranged at a position close to the bottom of the side wall of the box body;

[0011] A filter screen is set at a position flush with the inner wall of the box body, and a conveyor belt is fixedly connected between the filter screen and the air flow hood.

[0012] A measurement window and a visual window are set on the same side wall of the box body. An infrared thermometer is set outside the measurement window, and a high-definition camera is set outside the visual window.

[0013] A sliding window is opened on the side wall of the box body, and it has a folding fan-shaped structure. A smoke sensor is set obliquely above it.

[0014] A high-temperature electronic scale is set at the bottom of the box body and is connected to a computer through a data cable.

[0015] A K-type thermocouple, whose plug includes a second power line and a second electrode. The second electrode includes a protruding hemispherical electrode and a second ring-shaped electrode.

[0016] In some embodiments, the test device for the fireproof performance of tires further includes a constant-temperature heating rod and a retractable electric heating coil device. The constant-temperature heating rod includes a first constant-temperature heating rod and a second constant-temperature heating rod. The first constant-temperature heating rod is set above the box body, and the second constant-temperature heating rod is fixedly connected between the upper and lower belts of the conveyor belt. The retractable electric heating coil device is set outside the box body and below the measurement window, and is fixedly connected to the side wall of the box body through an inclined rod.

[0017] In some embodiments, the retractable electric heating coil device includes a hollow telescopic rod, one end of which is connected to a rotating shaft; a retractable electric heating coil, which is connected to a power line passing through the hollow telescopic rod; a wire winding and unwinding device, one end of the wire winding and unwinding device passes through the hollow telescopic rod and is connected to the rotating shaft, and the other end is connected to the retractable electric heating coil; a spring, including two groups, one group is set inside the hollow telescopic rod, and the other group is set on the circumferential diameter of the retractable electric heating coil, and its two ends are connected to the retractable electric heating coil.

[0018] In some embodiments, the test device for the fireproof performance of tires further includes a hydraulic rod, which is of a hollow structure. One end of it passes through the sliding window and enters the interior of the box body, and the other end is connected to a hydraulic loading device. A rotating wheel shaft, an annular seal, a movable electromagnetic seal ring, and a fixed electromagnetic coil are sequentially arranged on the hydraulic rod. Among them, the wheel shaft is rotatably connected to the hydraulic rod, and a wheel rim is connected to it; the annular seal is rotatably connected to the hydraulic rod and is connected to a deflation device; the movable electromagnetic seal ring is movably connected to the hydraulic rod; the fixed electromagnetic coil is fixedly connected to the hydraulic rod.

[0019] In some embodiments, the test device for the fireproof performance of tires further includes a rotatable power socket, which is set at one end of the hydraulic rod. It includes a first power line and a first electrode. The first electrode is divided into a concave hemispherical electrode and a first ring-shaped electrode, which is matched with the second electrode of the K-type thermocouple.

[0020] In some of these embodiments, the test device for the fireproof performance of a tire further includes a deflation device. The deflation device includes a connecting pipe, one end of which is fixedly connected to a pressure sensor, and the other end is fixedly connected to a deflation ring. The deflation ring is fixedly connected to the annular sealing port by bolts; a first sealing gasket, a second sealing gasket, and a fastening bolt are sequentially arranged between the connecting pipe and the deflation ring.

[0021] In addition, the present invention also provides an application of the test device for the fireproof performance of a tire, which can be applied to the test of tread pattern and rubber compound fireproof performance, the test of the overall structure, pattern, and rubber compound fireproof performance of a tire, and the judgment of the flame retardancy of a rubber compound.

[0022] A method for testing the dynamic fireproof performance of a tire using the above test device for the fireproof performance of a tire includes the following steps: Install the tire to be detected, and connect multiple K-type thermocouples to the detection parts. Check the test device, turn on the constant-temperature heating rod. When the infrared thermometer detects that the conveyor belt reaches a predetermined temperature, apply a pressure to the tire towards the conveyor belt through the hydraulic loading device, so that the tire rotates driven by the movement of the conveyor belt. The K-type thermocouple monitors the tread temperature data in real time and transmits it to the computer terminal for monitoring. When the tire reaches the ignition temperature, sense the ignition signal through the smoke sensor, open the annular sealing port, quickly release the tire pressure, and the high-temperature electronic scale records the mass of the combustion products and transmits it to the computer terminal to form a time-mass curve for detection. After the detection is completed, open the carbon dioxide gas storage tank to extinguish the fire.

[0023] The dynamic fireproof performance test of a tire includes the test of tread pattern and rubber compound fireproof performance and the test of the overall structure, pattern, and rubber compound fireproof performance of a tire.

[0024] A method for testing the static fireproof performance of a tire using the test device for the fireproof performance of a tire includes the following steps: Install the tire and the wheel rim on the rotating wheel shaft, and connect multiple K-type thermocouples to the detection parts; Check whether the ventilation window, carbon dioxide gas storage tank, etc. of the test device are normal, then close the fireproof door, turn on the power supply required for the test device, and at the same time check the displayed temperature of the K-type thermocouple and zero the high-temperature electronic scale; Turn on the power supply of the retractable electric heating coil device and the conveyor belt power supply, set the temperature, observe the temperature through the infrared thermometer. After reaching the set temperature, synchronously move the retractable electric heating coil and adjust its size so that it can be in contact with and lean against the sidewall detection position of the test position, and control its monitoring sub-port, sidewall, and tread positions; The high-definition camera records the open-flame combustion time of the tire and the spread of the fire. The K-type thermocouple transmits the collected signal to the data collector to generate a tire temperature-time change curve, and the high-temperature electronic scale transmits the collected signal to the signal collector to record the mass-time curve; After the detection is completed, open the carbon dioxide gas storage tank to extinguish the internal flame to ensure safety.

[0025] The static fireproof performance test of a tire is the test of the flame retardancy of a rubber compound.

[0026] Based on the above technical solutions, compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0027] (1) The test device for the fire prevention performance of the tire of the present invention can conduct dynamic detection, test the tread pattern and the fire prevention performance of the rubber compound, and test the fire prevention performance of the overall structure, pattern and rubber compound of the tire; the test device for the fire prevention performance of the tire of the present invention can conduct static detection to judge the flame retardancy of the rubber compound.

[0028] (2) The present invention is provided with a smoke sensor, a pressure sensor and a deflation device. When the smoke sensor detects the smoke in the test device, it will transmit a signal to the electromagnetic switch to control the opening of the annular seal, so that the gas in the tire can be quickly discharged; when the pressure is greater than the set pressure, the electromagnetic switch controls the opening of the annular seal, so that the gas in the tire can be quickly discharged to prevent explosion, and the safety of dynamic testing can be guaranteed.

[0029] (3) The technical solution of the present invention is provided with a K-type thermocouple and a high-definition camera. By collecting data through the thermocouple, the combustion situation can be determined. Through the high-definition camera, the time when the tire is ignited and the time of open flame combustion can be determined, and accurate test data can be obtained, which can avoid the situation where the unstable combustion and smoldering of the tire cannot be observed under the condition of only observing the open flame combustion state; by setting multiple thermocouples, the heat receiving conditions of each part of the tire during operation can be simulated. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0031] Figure 1 is a perspective view of the test device for the fire prevention performance of the tire of the embodiment of the present invention;

[0032] Figure 2 is a schematic internal structure diagram of the test device for the fire prevention performance of the tire of the embodiment of the present invention;

[0033] Figure 3 is a schematic structure diagram of the sliding window of the embodiment of the present invention;

[0034] Figure 4 is a schematic structure diagram of the retractable electric heating coil of the embodiment of the present invention;

[0035] Figure 5 is a schematic structure diagram of the rotatable power socket of the embodiment of the present invention;

[0036] Figure 6 is a schematic structure diagram of the connection of the hydraulic rod of the embodiment of the present invention;

[0037] Figure 7Schematic structural diagram of the air leakage device according to an embodiment of the present invention;

[0038] In the figure:

[0039] 1. Box body; 2. Fire door; 3. High-temperature electronic scale; 4. Ventilation window; 5. Visual window; 6. Measurement window; 7. High-definition camera; 8. Infrared thermometer; 9. Retractable electric heating coil device; 10. First constant-temperature heating rod; 11. Flow switch; 12. Pressure gauge; 13. Carbon dioxide gas storage tank; 14. Filter screen; 15. Second constant-temperature heating rod; 16. Conveyor belt; 17. Airflow hood; 18. Smoke sensor; 19. Sliding window; 20. Fixed electromagnetic coil; 21. Moving electromagnetic sealing ring; 22. Ring-shaped sealing port; 23. Rotating wheel shaft; 24. Rotatable power socket; 25. K-type thermocouple; 26. Hydraulic rod; 27. First power cord; 28; First electrode; 29. Second power cord; 30. Second electrode; 31. Pressure sensor; 32. Connecting pipe; 33. First sealing gasket; 34. Second sealing gasket; 35. Tightening bolt; 36. Air leakage ring; 901. Rotating shaft; 902. Hollow telescopic rod; 903. Winding and unwinding line; 904. First spring; 905. Second spring; 906. Retractable electric heating coil. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments 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 of 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.

[0041] In the description of the present invention, it should be understood that the terms "center", "horizontal", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0042] The terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include one or more of such features.

[0043] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] As shown in the Figure 1 and Figure 2 figure, in a schematic embodiment of the test device for the fireproof performance of the tire of the present invention, the test device includes a box body 1, on the side wall of which an air flow hood 17 is provided; a fireproof door 2 is provided on one side of the box body 1, and there is a handle on the door for the convenience of the test personnel to enter and exit; a high-temperature electronic scale 3 is provided at the bottom of the box body 1 for collecting data to judge the burning speed of the tire, and is connected to a computer through a data line during use to view the monitoring data; a carbon dioxide gas storage tank 13 is installed outside the box body 1, which is connected to the air flow hood 17 provided on the inner side wall of the box body 1 through a pipe fitting, and a pressure gauge 12 and a flow switch 11 are provided on the pipe fitting. Among them, the pressure gauge 12 is used to detect the pressure in the carbon dioxide gas storage tank 13, and the flow switch 11 is used to control the delivery of the carbon dioxide gas flow. When fire extinguishing is required inside the box body 1, the flow switch 11 is opened, and the carbon dioxide gas enters the inside of the box body 1 from the gas storage tank through the air flow hood 17 and disperses and moves downward, quickly squeezing out the air inside the box body 1 and making it flow out along the ventilation window for fire extinguishing; a ventilation window 4 is provided at a position close to the bottom on the side wall of the box body 1; a filter screen 14 is provided at a position flush with the ventilation window 4 on the inner wall of the box body 1. A conveyor belt 16 is fixedly connected between the filter screen 14 and the air flow hood 17, and the rotating shaft can be fixedly connected to the side wall of the box body 1. The filter screen 14 is used to filter the gas. On the one hand, it can prevent a large amount of dust generated by combustion inside the box body 1 from flying out and causing pollution. On the other hand, it can also ensure the accuracy of the data when the high-temperature electronic scale 3 measures the mass; a measurement window 6 and a viewing window 5 are provided on the same side wall of the box body 1. The window of the measurement window 6 is sealed with a special glass for infrared temperature measurement, and a platform is provided outside the window. An infrared thermometer 8 is provided on the above platform, which can grasp the temperature inside the device in real time. To ensure the accuracy of the test temperature, the infrared thermometer 8 is preferably a short-wave infrared thermometer. A platform is also provided outside the viewing window, and a high-definition camera 7 is provided on the above platform for recording the combustion state inside the test device, and can determine the time when the tire is ignited and the time of open flame combustion; a sliding window 19, in a folding fan-shaped structure, is opened on the rear side wall of the box body 1 to prevent combustion gas and dust from flying out from here; a smoke sensor 18 is provided on the side wall of the box body 1, above the sliding window 19.

[0045] The test device for the fire prevention performance of a tire further includes a constant temperature heating rod and a retractable electric heating coil device 9. The constant temperature heating rod includes a first constant temperature heating rod 10 disposed above the box body 1 for providing constant temperature heat inside the test device; and a second constant temperature heating rod 15 fixedly connected between the upper and lower belts of the conveyor belt 16. When the tire contacts the conveyor belt 16, it can drive the tire to rotate under the friction of the conveyor belt 16, thereby simulating the motion state of the tire. When the second constant temperature heating rod 15 is turned on, an initial contact temperature can be given to the tire, thereby reducing the heat generation time due to friction. The retractable electric heating coil device 9 is disposed outside the box body 1 and below the measurement window 6, and is fixedly connected to the side wall of the box body 1 through an inclined rod.

[0046] The retractable electric heating coil device 9 is used to heat the tire during static measurement. As Figure 4 shown, the retractable electric heating coil device 9 includes a rotating shaft 901, a hollow telescopic rod 902, a retractable electric heating coil 906, a wire winding and unwinding device 903, and a spring. One end of the hollow telescopic rod 902 is connected to the rotating shaft 901; preferably, there are two wire winding and unwinding devices 903, one end of each is connected to both ends of the diameter of the circumference of the retractable electric heating coil, and then enters the other end of the hollow telescopic rod 902 at the center position and is commonly connected to the rotating shaft 901; the spring is divided into two groups, including a first spring 904 and a second spring 905. The first spring 904 is disposed inside the hollow telescopic rod 902, and the second spring 905 is disposed on the diameter of the circumference of the retractable electric heating coil 906, and its two ends are connected to the retractable electric heating coil 906; the retraction and extension of the retractable electric heating coil 906 can be realized by rotating the rotating shaft 901; the power line is connected to the retractable electric heating coil 906 through the hollow telescopic rod 902 to enable it to supply heat.

[0047] The test device for the fireproof performance of a tire further includes a hydraulic rod 26. The hydraulic rod 26 has a hollow structure. One end of it passes through the sliding window 19 and enters the interior of the box body 1, and the other end is connected to a hydraulic loading device, which can apply pressure to the tire towards the conveyor belt. The power supply lines connecting various devices on the hydraulic rod 26 pass through its hollow interior for connection. Multiple groups of power supply lines are respectively connected to the rotatable power socket 24; a rotating wheel shaft 23, an annular seal 22, a movable electromagnetic seal ring 21, and a fixed electromagnetic coil 20 are sequentially arranged on the hydraulic rod 26. Among them, the rotating wheel shaft 23 is rotatably connected to the hydraulic rod 26, and a wheel rim is connected thereto for mounting the tire; the annular seal 22 is rotatably connected to the hydraulic rod 26 and is connected to the air leakage device. The metal outer surface of the annular seal 22 is provided with a silicone material, which can form a better gas seal during extrusion; the movable electromagnetic seal ring 21 is movably connected to the hydraulic rod 26 for opening and closing the annular seal 22; the fixed electromagnetic coil 20 is fixedly connected to the hydraulic rod 26 for attracting the movable electromagnetic seal ring 21 to move and controlling the opening and closing of the annular seal 22. The electromagnetic force formed after the annular seal 22, the movable electromagnetic seal ring 21, and the fixed electromagnetic coil 20 are energized should be greater than the pressure of the air pressure inside the tire.

[0048] As Figure 5 shown, the test device for the fireproof performance of a tire further includes a rotatable power socket 24, which is arranged at one end of the hydraulic rod 26. It includes a first power supply line 27 and a first electrode 28. Among them, the first electrode 28 is divided into a concave hemispherical electrode and a first annular electrode. Multiple K-type thermocouples 25 can be inserted into the rotatable power socket 24; the plug of the K-type thermocouple 25 includes a second power supply line 29 and a second electrode 30. The second electrode 30 includes a protruding hemispherical electrode and a second annular electrode, which is matched with the first electrode 28 of the rotatable power socket 24.

[0049] One end of the K-type thermocouple 25 is connected to a power supply line through the rotatable power socket 24 to output a signal, and the other end is connected to a data recorder to collect data in real time and transmit it to a computer through a data line to generate monitoring data, and the ignition point of the tire can be read. In the temperature graph collected by the K-type thermocouple 25, find the data graph where the temperature of the tire rises instantaneously. The temperature before the sharp rise is its ignition point. To increase the data accuracy, the number of K-type thermocouples 25 arranged can be increased. During use, in order to protect the K-type thermocouple 25, it is wrapped with tinfoil and pasted on the position of the tire to be detected, such as the tread surface. When the tire rotates, it drives the K-type thermocouple 25 to do a circular motion, and the rotatable power socket 24 also rotates accordingly to prevent the power supply line from winding and knotting.

[0050] As Figure 6As shown in the figure, an opening is provided on the tire sidewall. Through a deflation device, it is fixedly connected to the annular seal 22 by bolts. After the annular seal 22, the movable electromagnetic seal ring 21, and the fixed electromagnetic ring 20 are energized, they have magnetism. When sealing, under the action of electromagnetic attraction, the movable electromagnetic seal ring 21 and the annular seal 22 move towards each other. At the same time, the fixed electromagnetic ring 20 gives a repulsive force to the movable electromagnetic seal ring 21, causing the movable electromagnetic seal ring 21 and the annular seal 22 to closely combine to form a gas seal. When deflating, the annular seal 22 and the movable electromagnetic seal ring 21 move in the opposite direction under the electromagnetic action. At the same time, the fixed electromagnetic ring 20 gives a suction force to the movable electromagnetic seal ring 21, opening the annular seal 22 and quickly deflating the tire.

[0051] As Figure 7 shown, multiple groups of deflation devices are arranged circumferentially, including a connecting pipe 32. One end of the connecting pipe 32 is fixedly connected to a pressure sensor 31, and the other end is fixedly connected to a deflation ring 36. The deflation ring 36 is provided with a convex mouth, which is matched with the concave connecting part provided on the annular seal 22 and is tightly connected by bolts to form a seal. A first sealing gasket 33, a second sealing gasket 34, and a fastening bolt 35 are sequentially arranged between the connecting pipe 32 and the deflation ring 36. The tire is placed between the first sealing gasket 33 and the second sealing gasket 34, and the airtightness between the tire and the adjacent sealing electric sheets can be made better by applying glue.

[0052] In the embodiment of the present invention, the pressure sensor 31 is connected to the electromagnetic switches of the fixed electromagnetic ring 20, the movable electromagnetic seal ring 21, and the annular seal 22. When the pressure is greater than the set pressure, the electromagnetic switch controls to open the annular seal, enabling the gas in the tire to quickly escape and preventing explosion. When the smoke sensor 18 detects smoke in the device, it will transmit a signal to the electromagnetic switch to control the opening of the annular seal 22, enabling the gas in the tire to quickly escape. For the above two control methods, no matter which one reaches the set condition first, the annular seal 22 can be quickly opened to ensure safety.

[0053] Since once the tire catches fire, it will be impossible to test the fire prevention performance of other parts. However, according to daily data statistics, the parts where the tire catches fire are mainly the tread and the bead part, and the probability of these two is relatively high. For a more comprehensive comparison, the device is provided with two dynamic measurement methods. One can only test the tread and test the fire prevention performance of the tread pattern and rubber compound. The other can conduct a comprehensive test and test the fire prevention performance of the overall structure, pattern, and rubber compound of the tire.

[0054] The steps for dynamic testing using the test device for the fire prevention performance of the tire of the present invention are as follows: Install the tire to be detected, connect multiple K-type thermocouples 25 to the detection part, check the test device, turn on the constant temperature heating rod 15. When the infrared thermometer 8 detects that the conveyor belt 16 reaches the predetermined temperature, apply pressure to the tire towards the conveyor belt 16 through the hydraulic loading device, so that the tire rotates driven by the movement of the conveyor belt 16. The K-type thermocouple 25 monitors the tread temperature data in real time and transmits it to the computer terminal for monitoring. When the tire ignition temperature is reached, the fire signal is sensed by the smoke sensor 18, the annular seal 22 is opened, the tire pressure is quickly released, and the high-temperature electronic scale 3 records the mass of the combustion products and transmits it to the computer terminal to form a time-mass curve for detection. After the detection is completed, open the carbon dioxide gas storage tank 13 to extinguish the fire.

[0055] It should be noted that when performing dynamic detection of the tire, the tire needs to be inflated and used, and an opening is made on the tire sidewall to connect the air release device; when testing the fire prevention performance of the tread pattern and rubber compound, turn on the second constant temperature heating rod 15 for heating; when testing the fire prevention performance of the overall structure, tread pattern and rubber compound of the tire, turn on the first constant temperature heating rod 10 for heating.

[0056] The steps for static testing of the flame retardancy of the rubber compound using the test device for the fire prevention performance of the tire of the present invention are as follows: Install the tire and the rim on the rotating wheel shaft 23, and connect multiple K-type thermocouples 25 to the detection part; check whether the ventilation window 4, carbon dioxide gas storage tank 13, etc. of the test device are normal, then close the fire door 2, connect the power supply required for the test device, and at the same time check the displayed temperature of the K-type thermocouple 25 and zero the high-temperature electronic scale 3; connect the power supply of the retractable electric heating coil device 9 and the conveyor belt 16, set the temperature, observe the temperature through the infrared thermometer 8. After reaching the set temperature, synchronously move the retractable electric heating coil 906 and adjust its size so that it can be in contact with the detection position on the tire sidewall, and control its monitoring sub-port, tire sidewall and tread positions; the high-definition camera 7 records the open fire combustion time and the spread of the fire of the tire, the K-type thermocouple 25 transmits the collected signal to the data collector to generate a tire temperature-time change curve, and the high-temperature electronic scale 3 transmits the collected signal to the signal collector to record the mass-time curve; after the detection is completed, open the carbon dioxide gas storage tank 13 to extinguish the internal flame to ensure safety.

[0057] It should be noted that during static detection of the tire, there is no need to inflate the tire or connect the air release device, but an opening still needs to be made on the tire sidewall to prevent an enclosed space from being formed inside after the tire and the rim are combined, and the gas inside expands due to heat and explodes. The shape and size of the opening on the tire sidewall are set and adjusted according to the detection requirements.

[0058] In the above-described exemplary embodiment, the test device for the fireproof performance of a tire can detect both dynamic and static fireproof performance, and can achieve a safe and comprehensive judgment of the fireproof performance of the tire.

[0059] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and the key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0060] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present invention or perform equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A test device for the fireproof performance of a tire, comprising: a box body (1) with an air flow hood (17) provided on its side wall; a fireproof door (2) provided on one side of the box body (1) and having a door handle thereon; characterized in that the test device for the fireproof performance of the tire further comprises a carbon dioxide gas storage tank (13) provided outside the box body (1) and connected to the air flow hood (17) inside the box body (1) through a pipe fitting, and a pressure gauge (12) and a flow switch (11) are provided on the pipe fitting; a ventilation window (4) provided at a position near the bottom of the side wall of the box body (1); a filter screen (14) provided at a position flush with the ventilation window (4) on the inner wall of the box body (1), and a conveyor belt is fixedly connected between the filter screen (14) and the air flow hood (17); a measurement window (6) and a visual window (5) provided on the same side wall of the box body (1), an infrared thermometer (8) is provided outside the measurement window (6), and a high-definition camera (7) is provided outside the visual window; a sliding window (19) opened on the side wall of the box body (1) and having a folding fan-shaped structure, and a smoke sensor (18) is provided obliquely above it; a high-temperature electronic scale (3) provided at the bottom of the box body (1) and connected to a computer through a data line; a K-type thermocouple (25) whose plug includes a second power line (29) and a second electrode (30), and the second electrode (30) includes a protruding hemispherical electrode and a second ring-shaped electrode; a constant-temperature heating rod, including a first constant-temperature heating rod (10) provided above the box body (1) for providing constant-temperature heat inside the test device; a second constant-temperature heating rod (15) fixedly connected between the upper and lower belts of the conveyor belt (16) for providing an initial contact temperature to the tire when simulating the movement state of the tire; a retractable electric heating coil device (9) provided outside the box body (1) and below the measurement window (6), and fixedly connected to the side wall of the box body (1) through an inclined rod. The retractable electric heating coil device (9) is used to heat the tire during static measurement. The retractable electric heating coil device (9) includes a hollow telescopic rod (902) whose one end is connected to a rotating shaft (901); a retractable electric heating coil (906) connected to a power line passing through the hollow telescopic rod (902); a wire winding and unwinding device (903) whose one end passes through the hollow telescopic rod (902) and is connected to the rotating shaft (901), and the other end is connected to the retractable electric heating coil (906); springs, including a first spring (905) and a second spring (906), the first spring (905) is provided inside the hollow telescopic rod (902), and the second spring (906) is provided on the circumferential diameter of the retractable electric heating coil (906) and its two ends are connected to the retractable electric heating coil (906); The hydraulic rod (26) has a hollow structure. One end thereof passes through the sliding window (19) and enters the interior of the box body (1), and the other end is connected to a hydraulic loading device. A rotating wheel shaft (23), an annular sealing port (22), a movable electromagnetic sealing ring (21), and a fixed electromagnetic coil (20) are sequentially arranged on the hydraulic rod (26). Among them, the wheel shaft is rotatably connected to the hydraulic rod (26), and a rim is connected thereto; the annular sealing port (22) is rotatably connected to the hydraulic rod (26) and is connected to a deflating device; the movable electromagnetic sealing ring (21) is movably connected to the hydraulic rod (26); the fixed electromagnetic coil (20) is fixedly connected to the hydraulic rod (26).

2. The test device for the fire resistance performance of a tire according to claim 1, characterized in that, the test device for the fire resistance performance of a tire further includes a rotatable power socket (24) arranged at one end of the hydraulic rod (26), which includes a first power cord (27) and a first electrode (28). Among them, the first electrode (28) is divided into a concave hemispherical electrode and a first annular electrode, which is matched with the second electrode (30) of the K-type thermocouple (25).

3. The test device for the fire resistance performance of a tire according to claim 1, characterized in that, the test device for the fire resistance performance of a tire further includes a deflating device. The deflating device includes a connecting pipe (32). One end thereof is fixedly connected to a pressure sensor (31), and the other end is fixedly connected to a deflating ring (36). The deflating ring (36) is fixedly connected to the annular sealing port (22) by bolts; a first sealing gasket (33), a second sealing gasket (34), and a fastening bolt (35) are sequentially arranged between the connecting pipe (32) and the deflating ring (36).

4. A method for testing the dynamic fire resistance performance of a tire using the test device for the fire resistance performance of a tire according to any one of claims 1-3, characterized in that, install the tire to be detected, connect a plurality of K-type thermocouples (25) to the detection parts, check the test device, turn on the constant temperature heating rod. When the infrared thermometer (8) detects that the conveyor belt (16) reaches a predetermined temperature, apply a pressure to the tire towards the conveyor belt (16) through the hydraulic loading device, so that the tire rotates driven by the movement of the conveyor belt (16). The K-type thermocouple (25) monitors the tread temperature data in real time and transmits it to the computer terminal for monitoring. When the tire ignition temperature is reached, sense the ignition signal through the smoke sensor (18), open the annular sealing port (22), quickly release the tire pressure, and the high-temperature electronic scale (3) records the mass of the combustion products and transmits it to the computer terminal to form a time-mass curve for detection. After the detection, open the carbon dioxide gas storage tank (13) for fire extinguishing.

5. The method for testing the dynamic fire resistance performance of a tire using the test device for the fire resistance performance of a tire according to claim 4, characterized in that, the dynamic fire resistance performance test of the tire includes the test of the tread pattern, the fire resistance performance of the rubber compound, and the test of the fire resistance performance of the overall structure, pattern, and rubber compound of the tire.

6. A method for testing the static fire resistance performance of a tire using the test device for the fire resistance performance of a tire according to any one of claims 1-3, characterized in that, Install the tire and rim on the rotating axle (23), and connect multiple K-type thermocouples (25) to the detection parts; check whether the ventilation window (4), carbon dioxide gas storage tank (13), etc. of the test device are normal, then close the fire door (2), turn on the power supply required for the test device, and at the same time check the displayed temperature of the K-type thermocouple (25), and zero the high-temperature electronic scale (3); turn on the power supply of the retractable electric heating coil device (9) and the conveyor belt (16), set the temperature, observe the temperature through the infrared thermometer (8), after reaching the set temperature, synchronously move the retractable electric heating coil (906) and adjust its size so that it can be in contact with the sidewall detection position at the test position, and control its monitoring of the sub-mouth, sidewall, and tread positions; the high-definition camera (7) records the open-fire burning time of the tire and the spread of the fire, the K-type thermocouple (25) transmits the collected signal to the data collector to generate a tire temperature-time change curve, and the high-temperature electronic scale (3) transmits the collected signal to the signal collector to record the mass-time curve; after the detection is completed, open the carbon dioxide gas storage tank (13) to extinguish the internal flame to ensure safety.

7. A method for testing the static fire resistance performance of a tire using the test device for the fire resistance performance of a tire according to claim 6, characterized in that, The static fire resistance performance test of the tire is a flame retardancy test of the rubber compound.

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