Explosion test transient parameter test system for coal mine explosion-proof equipment and safety evaluation method

Abstract

The invention relates to a transient parameter testing system for an explosion test of coal mine explosion-proof equipment. The transient parameter testing system comprises a gas source module, a gas distribution module, an explosion-proof test tank, an ignition module, a PLC, a transient response thermocouple, an explosion-proof high-speed camera and an industrial computer, the output end of the gas source module is connected with the input end of the gas distribution module through a first gas pipeline, the gas output end of the gas distribution module is connected with the explosion-proof test groove through a second gas pipeline, the ignition module is installed on the explosion-proof test groove, and the test end of the transient response thermocouple is fixed to an explosion-proof equipment prototype. A camera of the explosion-proof high-speed camera is right opposite to an ignition module of the explosion-proof test tank, and the explosion-proof high-speed camera is connected with the industrial computer. The invention also provides a safety evaluation method of the transient parameter test system for the explosion test of the coal mine explosion-proof equipment. The technical problems that explosion test temperature data of explosion-proof equipment cannot be tested and safety evaluation means are lacked after transient temperature shock are solved.

Description

Technical Field

[0001] This invention relates to the field of explosion-proof equipment testing technology, specifically to a transient parameter testing system and safety assessment method for explosion-proof equipment in coal mines. Background Technology

[0002] Explosion-proof equipment for coal mines refers to equipment such as explosion-proof electromagnetic starters, explosion-proof high-voltage power distribution devices, explosion-proof junction boxes, and explosion-proof integrated lighting protection devices used underground in coal mines. These devices are widely used in flammable and explosive environments such as underground mining, tunneling, and transportation. Because the operating environment contains explosive gases such as methane and coal dust, equipment used in explosive gas atmospheres should be equipped with explosion-proof enclosures to ensure that if a spark ignites the explosive gas inside the enclosure, the resulting flame will not ignite the external explosive gas. The design requires that the enclosure not be damaged or deformed when subjected to the pressure generated by an internal explosion. National standard GB / T3836.1-2021 "Explosive Atmospheres, Part 1: Equipment, General Requirements", machinery industry standard JB / T8739-2015 "Explosion-proof High-voltage Power Distribution Devices for Mining", and coal industry standard MT / T661-2011 "General Technical Conditions for Electrical Equipment Used in Coal Mines" all clearly stipulate the technical requirements for explosion testing of explosion-proof equipment in coal mines. Explosion testing is a necessary inspection item for type testing of explosion-proof equipment in coal mines and a primary means of assessing its safety performance. Explosion testing of explosion-proof equipment in coal mines involves a transient process on the order of milliseconds, with significant transient impacts. Conventional high-speed cameras have poor resistance to transient impacts and are unsuitable for explosive environments. Ordinary explosion-proof cameras cannot capture the transient information transmitted through the explosion-proof surface by the transient explosion flame. Furthermore, conventional thermocouples have slow response speeds and poor resistance to transient impacts, failing to meet the transient temperature testing requirements of explosion-proof equipment in coal mines, and also unable to conduct safety assessments of the equipment's enclosure during transient temperature impacts. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide a transient parameter testing system for explosion-proof equipment in coal mines. This system utilizes transient response thermocouples and explosion-proof high-speed cameras to collect transient parameter data. A digital signal processor and an industrial computer then perform calculations and processing on the transient parameter data, thereby enabling transient parameter testing and safety assessment of explosion-proof equipment in coal mines.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a transient parameter testing system for explosion testing of explosion-proof equipment in coal mines, including a gas source module, a gas distribution module, an explosion-proof test chamber, an ignition module, a PLC, a transient response thermocouple, an explosion-proof high-speed camera, and an industrial computer; The output end of the gas source module is connected to the input end of the gas distribution module through the first gas pipeline, and the gas output end of the gas distribution module is connected to the explosion-proof test chamber through the second gas pipeline. An ignition module is installed on the explosion-proof test chamber. The test end of the transient response thermocouple is fixed on the explosion-proof equipment prototype. The explosion-proof equipment prototype is placed in the explosion-proof test chamber. The camera of the explosion-proof high-speed camera is facing the ignition module of the explosion-proof test chamber, and the explosion-proof high-speed camera is connected to an industrial computer. The signal control terminal of the gas distribution module is connected to the gas distribution control signal output terminal of the PLC, and the PLC controls the operation of the gas distribution module. The signal control terminal of the ignition module is connected to the ignition module control signal output terminal of the PLC, and the PLC controls the operation of the ignition module.

[0005] Furthermore, the signal output terminal of the transient response thermocouple is connected to the signal input terminal of the signal processing circuit, the communication port of the explosion-proof high-speed camera is connected to the communication port of the industrial computer, the signal output terminal of the signal processing circuit is connected to the temperature signal input terminal of the digital signal processor, and the communication signal terminal of the digital signal processor is connected to the communication interface of the industrial computer.

[0006] Furthermore, the signal output terminal of the PLC is connected to the signal output terminal of the touch screen, and the communication signal terminal of the PLC is connected to the communication interface of the industrial computer.

[0007] Furthermore, the transient response thermocouple uses a tungsten-rhenium thermocouple wire and a coaxial probe with a metal coating. Both the tungsten-rhenium thermocouple wire and the coaxial probe are fixed to the inner wall of the explosion-proof equipment prototype by drilling, and the test ends of the tungsten-rhenium thermocouple wire and the coaxial probe are flush with the inner wall surface of the explosion-proof equipment prototype.

[0008] Furthermore, the display signal interface of the industrial computer is connected to the communication signal input terminal of the display module.

[0009] Furthermore, the transient parameter testing system for explosion testing of coal mine explosion-proof equipment also includes a gas analysis unit. The test end of the gas analysis unit is located after the gas distribution module and connected to the second gas pipeline. The signal output end of the gas analysis unit is connected to the gas signal input end of the industrial computer.

[0010] Furthermore, the transient parameter testing system for explosion testing of coal mine explosion-proof equipment also includes a parameter testing module for detecting the transient internal pressure, stress, and strain of the shell inside the explosion-proof test tank during explosion. The test end of the parameter testing module is placed inside the shell of the explosion-proof test tank, and the signal output end of the parameter testing module is connected to the pressure signal input end of the digital signal processor.

[0011] This invention also provides a safety assessment method for the aforementioned transient parameter testing system for explosion-proof equipment in coal mines, comprising the following steps: Step S1: Check the integrity of the explosion-proof equipment prototype and test equipment. Drill multiple holes in the explosion-proof equipment prototype to install the inlet and outlet pipes of explosive gas, the test terminal of the parameter test module, and the ignition module. Install the explosive gas inlet and outlet interfaces, the parameter test module, and the ignition module at the drilled holes respectively. Then add filling material to simulate the internal components of the explosion-proof equipment prototype to simulate the actual use scenario of the explosion-proof equipment prototype. Step S2: Place the explosion-proof equipment prototype in the explosion-proof test chamber, connect the transient response thermocouple, point the lens of the explosion-proof high-speed camera directly at the explosion-proof equipment prototype, and close the airtight door of the explosion-proof test chamber. Step S3: Start the transient parameter testing system for explosion test of coal mine explosion-proof equipment. Set the explosion test system parameters through the touch screen. The touch screen sends control commands to the system through the PLC to control the gas distribution module to introduce explosive gas into the explosion-proof test chamber and adjust the gas concentration. The gas analysis unit determines whether the gas concentration meets the requirements. If it does not meet the requirements, the PLC controls the gas distribution module to adjust the gas concentration again. If it meets the requirements, proceed to step S4 to prepare for the explosion test. Step S4: Start the ignition module to conduct an explosion test, and collect test data through the parameter test module and transient response thermocouple, and collect explosion flame images through an explosion-proof high-speed camera; Step S5: The signal processing circuit converts the test data from the parameter testing module and the transient response thermocouple and transmits it to the digital signal processor for calculation and processing to obtain the pressure, stress, strain and temperature data of the explosion process. The data is then transmitted to the industrial computer, which calculates the heat flux density based on the temperature data. The acquired images of the explosion flames are transmitted to an industrial computer. The industrial computer processes the images to obtain the flame propagation characteristics along the explosion path. The image processing method of the industrial computer specifically includes the following steps: Step S501: The industrial computer opens the image processing software, imports the exploded image, performs grayscale processing, and obtains a grayscale image with uniform pixels. Step S502, using The operator performs edge detection, adjusts the noise threshold, and deletes the image outside the explosion flame to obtain the explosion flame image of the explosion-proof equipment prototype; Step S503: Process the flame images of the explosion-proof equipment prototype at different stages of the explosion using the method in step S502 to obtain the explosion flames at different stages. Step S504: The flame front coordinates of the explosion flame images at different times are obtained by calculation, and the flame front propagation speed is calculated by the time interval and the flame front coordinates. Step S505: Calculate the duration of the explosion using the image acquisition interval and images of the flame's generation and extinguishing. The industrial computer calculates the heat flux density based on temperature data, and performs a safety assessment after transient impact based on the calculated flame front propagation speed and explosion duration, combined with pressure, stress, strain and images. Step S6: Remove the remaining gas from the explosion-proof test chamber, organize the test system equipment and the prototype of the coal mine explosion-proof equipment, and complete the explosion test.

[0012] Furthermore, the heat flux density in step S5 is calculated using the integral formula for heat flux density, as follows: ;

[0013] In the formula: q is the surface heat flux, ρ is the density of the material, c is the specific heat of the material, k is the thermal conductivity of the material, π is 3.14, τ is the integration variable, and t represents time. s (τ) represents the surface temperature change.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The transient parameter testing system for explosion testing of explosion-proof equipment in coal mines of the present invention can realize high-speed synchronous acquisition of multiple parameters such as temperature, pressure, and flame propagation characteristics during the transient explosion process, which solves the defect that conventional explosion testing of explosion-proof equipment cannot test multiple parameters at the same time.

[0015] 2. The transient parameter testing system for explosion testing of explosion-proof equipment in coal mines of the present invention adopts the synergistic application of explosion-proof high-speed camera and transient response thermocouple to effectively capture the propagation trajectory of explosion flame along the explosion-proof surface and the transient temperature field distribution of the shell, providing key data support for safety assessment after transient temperature shock.

[0016] 3. The transient parameter testing system for explosion testing of explosion-proof equipment in coal mines of the present invention achieves precise control of gas concentration, explosion triggering timing control and data acquisition and processing through the integrated control of PLC and industrial computer, which significantly improves the repeatability of the test and the reliability of the results.

[0017] 4. The safety assessment method of the transient parameter testing system for explosion test of coal mine explosion-proof equipment of the present invention is based on image processing algorithm to accurately calculate the flame front propagation speed and explosion duration, and calculates the heat flux density through the heat flux density integral formula. At the same time, it combines pressure, stress, strain and image to conduct safety assessment after transient impact, and constructs a multi-dimensional safety assessment system for the shell structure of explosion-proof equipment.

[0018] In summary, the transient parameter testing system and safety assessment method for explosion testing of explosion-proof equipment in coal mines of the present invention solves the technical problems of the inability to test temperature data in explosion testing of explosion-proof equipment and the lack of safety assessment methods after transient temperature shock. It improves the explosion testing and inspection capabilities of explosion-proof equipment, provides experimental verification technical support for the selection of explosion-proof enclosures and components in the development of new explosion-proof equipment products, ensures the quality of explosion-proof equipment products, and promotes the continuous and healthy development of the testing and inspection and explosion-proof electrical fields. Attached Figure Description

[0019] Figure 1 This is a structural block diagram of the transient parameter testing system for explosion testing of explosion-proof equipment in coal mines according to the present invention; Figure 2 This is a schematic diagram of the installation of the transient response thermocouple of the present invention; Figure 3 This is a flowchart of the safety assessment method for the transient parameter testing system for explosion testing of explosion-proof equipment in coal mines, as described in this invention. In the diagram, 1. Gas source module, 2. Gas distribution module, 3. Explosion-proof test chamber, 4. Ignition module, 5. PLC, 6. Transient response thermocouple, 7. Explosion-proof high-speed camera, 8. Industrial computer, 9. Signal processing circuit, 10. Digital signal processor, 11. Gas analysis unit, 12. Touch screen, 13. Display module, 14. First gas pipe, 15. Second gas pipe, 16. Parameter testing module, 17. Inner wall of explosion-proof equipment prototype, 18. Tungsten-rhenium thermocouple wire, 19. Coaxial probe. Detailed Implementation

[0020] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the invention.

[0021] Example 1

[0022] like Figure 1 As shown, the transient parameter testing system for explosion-proof equipment in coal mines includes a gas source module 1, a gas distribution module 2, an explosion-proof test chamber 3, an ignition module 4, a PLC 5, a transient response thermocouple 6, an explosion-proof high-speed camera 7, and an industrial computer 8. The output end of the gas source module 1 is connected to the input end of the gas distribution module 2 through the first gas pipe 14. The gas output end of the gas distribution module 2 is connected to the explosion-proof test chamber 3 through the second gas pipe 15. An ignition module 4 is installed on the explosion-proof test chamber 3. The test end of the transient response thermocouple 6 is fixed on the explosion-proof equipment prototype. The camera of the explosion-proof high-speed camera 7 is facing the ignition module 4 of the explosion-proof test chamber 3, and the explosion-proof high-speed camera 7 is connected to the industrial computer 8. In this invention, the explosion-proof high-speed camera 7 has an explosion-proof shell on the outside of the high-speed camera, which has explosion-proof performance and can adapt to explosive environments; The signal control terminal of the gas distribution module 2 is connected to the gas distribution control signal output terminal of the PLC5, and the PLC5 controls the operation of the gas distribution module 2. The signal control terminal of the ignition module 4 is connected to the control signal output terminal of the ignition module 4 of the PLC5, and the PLC5 controls the operation of the ignition module 4.

[0023] The signal output terminal of the transient response thermocouple 6 is connected to the signal input terminal of the signal processing circuit 9, the communication port of the explosion-proof high-speed camera 7 is connected to the communication port of the industrial computer 8, the signal output terminal of the signal processing circuit 9 is connected to the temperature signal input terminal of the digital signal processor 10, and the communication signal terminal of the digital signal processor 10 is connected to the communication interface of the industrial computer 8.

[0024] The digital signal processor 10 converts the signal from the parameter testing module 16 into a signal that can be received at the input of the digital signal processor 10. After processing the pressure, stress and strain data, the digital signal processor 10 transmits them to the industrial computer 8 to provide data support for system safety assessment.

[0025] The signal output terminal of the PLC5 is connected to the signal output terminal of the touch screen 12, and the communication signal terminal of the PLC5 is connected to the communication interface of the industrial computer 8.

[0026] like Figure 2 As shown, the transient response thermocouple 6 uses a tungsten-rhenium thermocouple wire 18 and a coaxial probe 19 with a metal coating. Both the tungsten-rhenium thermocouple wire 18 and the coaxial probe 19 are fixed to the inner wall 17 of the explosion-proof equipment prototype by drilling. The test ends of the tungsten-rhenium thermocouple wire 18 and the coaxial probe 19 are flush with the surface of the inner wall 17 of the explosion-proof equipment prototype.

[0027] The transient response thermocouple 6 is flush with the surface of the inner wall 17 of the explosion-proof equipment prototype (the inner wall is made of metal). It measures the surface temperature of the contact area. In this case, the material of the transient response thermocouple 6 can be considered part of the surface of the inner wall 17 of the explosion-proof equipment prototype. Its conduction loss is the same as that of the unaffected metal inner wall, with no surface protrusion, thus not affecting surface convection. Using the above-mentioned material and structural design, the transient response thermocouple 6 can quickly sense instantaneous temperature changes and convert the temperature signal into an electrical signal output for real-time measurement and recording. Simultaneously, dynamic transient extrapolation or inert gas purging protection technology is used to estimate the transient flame temperature. The surface temperature change process during the explosion is calculated using the transient response thermocouple 6, and the heat flux density is calculated. Assuming that the internal heat conduction process of the transient response thermocouple 6 is one-dimensional, the surface heat flux density is obtained by solving the one-dimensional heat conduction equation at a step temperature in a semi-infinite medium.

[0028] The heat flux density is calculated using the integral formula for heat flux density, as follows: ;

[0029] In the formula: q is the surface heat flux, ρ is the density of the material, c is the specific heat of the material, k is the thermal conductivity of the material, π is 3.14, τ is the integration variable, and t represents time. s (τ) represents the surface temperature change.

[0030] The display signal interface of the industrial computer 8 is connected to the communication signal input terminal of the display module 13.

[0031] The transient parameter testing system for explosion testing of coal mine explosion-proof equipment also includes a gas analysis unit 11. The test end of the gas analysis unit 11 is located after the gas distribution module 2 and connected to the second gas pipeline 15. The signal output end of the gas analysis unit 11 is connected to the gas signal input end of the industrial computer 8.

[0032] The transient parameter testing system for explosion testing of coal mine explosion-proof equipment also includes a parameter testing module 16, which is used to detect the transient internal pressure, stress and strain of the shell inside the explosion-proof test tank 3. The test end of the parameter testing module 16 is placed inside the shell of the explosion-proof test tank 3, and the signal output end of the parameter testing module 16 is connected to the pressure signal input end of the digital signal processor 10.

[0033] Example 2

[0034] like Figure 3 As shown, the safety assessment method for the transient parameter testing system for explosion testing of coal mine explosion-proof equipment, implemented using the transient parameter testing system for explosion testing of coal mine explosion-proof equipment described in Example 1, includes the following steps: Step S1: Check the integrity of the explosion-proof equipment prototype and testing equipment (check whether all fastening bolts are installed and whether all inlet devices are completely sealed). The explosion-proof equipment prototype is a coal mine explosion-proof equipment prototype. Drill multiple holes on the explosion-proof equipment prototype (for installing the inlet and outlet pipes of explosive gas, the test end of the parameter test module 16, and the ignition module 4). Install the explosive gas inlet and outlet ports, the parameter test module 16, and the ignition module 4 (during installation, the inlet and outlet ports, the parameter test module 16, and the ignition module 4 should be installed diagonally to measure the maximum explosion pressure). Then add filler to simulate the internal components of the explosion-proof equipment prototype to simulate the actual use scenario of the explosion-proof equipment prototype. Step S2: Place the explosion-proof equipment prototype in the explosion-proof test chamber 3, connect the transient response thermocouple 6, point the lens of the explosion-proof high-speed camera 7 directly at the explosion-proof equipment prototype, and close the airtight door of the explosion-proof test chamber 3. Step S3: Start the transient parameter testing system for explosion test of coal mine explosion-proof equipment. Set the explosion test system parameters through the touch screen 12. The touch screen 12 sends control commands to the system through PLC 5 to control the gas distribution module 2 to introduce explosive gas into the explosion-proof test chamber 3 and adjust the gas concentration. The gas analysis unit 11 judges whether the gas concentration meets the requirements. If it does not meet the requirements, PLC 5 controls the gas distribution module 2 to adjust the gas concentration again. If it meets the requirements, proceed to step S4 to prepare for the explosion test. Step S4: Activate ignition module 4 to conduct an explosion test, and collect test data through parameter testing module 16 and transient response thermocouple 6, and collect explosion flame images through explosion-proof high-speed camera 7. In step S5, the signal processing circuit 9 converts the test data from the parameter testing module 16 and the transient response thermocouple 6 and transmits it to the digital signal processor 10 for calculation and processing to obtain the pressure, stress, strain and temperature data of the explosion process. The data is then transmitted to the industrial computer 8, which calculates the heat flux density based on the temperature data. The heat flux density is calculated using the integral formula for heat flux density, as follows: ;

[0035] In the formula: q is the surface heat flux, ρ is the density of the material, c is the specific heat of the material, k is the thermal conductivity of the material, π is 3.14, τ is the integration variable, and t represents time. s (τ) represents the surface temperature change; The acquired explosion flame image is transmitted to industrial computer 8. Industrial computer 8 processes the explosion flame image to obtain the flame propagation characteristics of the explosion process along the explosion isolation surface. The image processing method of industrial computer 8 specifically includes the following steps: Step S501: The industrial computer 8 opens the image processing software, imports the exploded image, performs grayscale processing, and obtains a grayscale image with uniform pixels. Step S502, using The operator performs edge detection, adjusts the noise threshold, and deletes the image outside the explosion flame to obtain the explosion flame image of the explosion-proof equipment prototype; Step S503: Process the flame images of the explosion-proof equipment prototype at different stages of the explosion using the method in step S502 to obtain the explosion flames at different stages. Step S504: The flame front coordinates of the explosion flame images at different times are obtained by calculation, and the flame front propagation speed is calculated by the time interval and the flame front coordinates. Step S505: Calculate the duration of the explosion using the image acquisition interval and images of the flame's generation and extinguishing. The industrial computer 8 calculates the heat flux density based on temperature data, and performs a safety assessment after transient impact based on the calculated flame front propagation speed and explosion duration, combined with pressure, stress, strain and images. Step S6: Remove the remaining gas from the explosion-proof test chamber 3, organize the test system equipment and explosion-proof equipment prototype, and complete the explosion test.

[0036] It is understood that, although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A transient parameter testing system for explosion-proof equipment in coal mines, characterized in that, It includes a gas source module, a gas distribution module, an explosion-proof test chamber, an ignition module, a PLC, transient response thermocouples, an explosion-proof high-speed camera, and an industrial computer; The output end of the gas source module is connected to the input end of the gas distribution module through the first gas pipeline, and the gas output end of the gas distribution module is connected to the explosion-proof test chamber through the second gas pipeline. An ignition module is installed on the explosion-proof test chamber. The test end of the transient response thermocouple is fixed on the explosion-proof equipment prototype. The explosion-proof equipment prototype is placed in the explosion-proof test chamber. The camera of the explosion-proof high-speed camera is facing the ignition module of the explosion-proof test chamber, and the explosion-proof high-speed camera is connected to an industrial computer. The signal control terminal of the gas distribution module is connected to the gas distribution control signal output terminal of the PLC, and the PLC controls the operation of the gas distribution module. The signal control terminal of the ignition module is connected to the ignition module control signal output terminal of the PLC, and the PLC controls the operation of the ignition module.

2. The transient parameter testing system for explosion testing of coal mine explosion-proof equipment as described in claim 1, characterized in that, The signal output terminal of the transient response thermocouple is connected to the signal input terminal of the signal processing circuit. The communication port of the explosion-proof high-speed camera is connected to the communication port of the industrial computer. The signal output terminal of the signal processing circuit is connected to the temperature signal input terminal of the digital signal processor. The communication signal terminal of the digital signal processor is connected to the communication interface of the industrial computer.

3. The transient parameter testing system for explosion testing of coal mine explosion-proof equipment as described in claim 1, characterized in that, The signal output terminal of the PLC is connected to the signal output terminal of the touch screen, and the communication signal terminal of the PLC is connected to the communication interface of the industrial computer.

4. The transient parameter testing system for explosion testing of coal mine explosion-proof equipment as described in claim 1, characterized in that, The transient response thermocouple uses a tungsten-rhenium thermocouple wire and a coaxial probe with a metal coating. Both the tungsten-rhenium thermocouple wire and the coaxial probe are fixed to the inner wall of the explosion-proof equipment prototype by drilling. The test ends of the tungsten-rhenium thermocouple wire and the coaxial probe are flush with the inner wall surface of the explosion-proof equipment prototype.

5. The transient parameter testing system for explosion testing of coal mine explosion-proof equipment as described in claim 1, characterized in that, The display signal interface of the industrial computer is connected to the communication signal input terminal of the display module.

6. The transient parameter testing system for explosion testing of coal mine explosion-proof equipment as described in claim 1, characterized in that, The transient parameter testing system for explosion testing of coal mine explosion-proof equipment also includes a gas analysis unit. The test end of the gas analysis unit is located after the gas distribution module and connected to the second gas pipeline. The signal output end of the gas analysis unit is connected to the gas signal input end of the industrial computer.

7. The transient parameter testing system for explosion testing of coal mine explosion-proof equipment as described in claim 1, characterized in that, The transient parameter testing system for explosion testing of coal mine explosion-proof equipment also includes a parameter testing module, which is used to detect the transient internal pressure, stress and strain of the shell inside the explosion-proof test tank. The test end of the parameter testing module is placed inside the shell of the explosion-proof test tank, and the signal output end of the parameter testing module is connected to the pressure signal input end of the digital signal processor.

8. A safety assessment method for a transient parameter testing system for explosion testing of explosion-proof equipment in coal mines, implemented using the transient parameter testing system for explosion testing of explosion-proof equipment in coal mines as described in any one of requirements 1-7, characterized in that... Includes the following steps: Step S1: Check the integrity of the explosion-proof equipment prototype and test equipment. Drill holes in the explosion-proof equipment prototype to install the inlet and outlet pipes of the explosive gas, the test terminal of the parameter test module, and the ignition module. Install the explosive gas inlet and outlet interfaces, the parameter test module, and the ignition module at the drilled holes respectively. Then add filler to simulate the internal components of the explosion-proof equipment prototype to simulate the actual use scenario of the explosion-proof equipment prototype. Step S2: Place the explosion-proof equipment prototype in the explosion-proof test chamber, connect the transient response thermocouple, point the lens of the explosion-proof high-speed camera directly at the explosion-proof equipment prototype, and close the airtight door of the explosion-proof test chamber. Step S3: Start the transient parameter testing system for explosion test of coal mine explosion-proof equipment. Set the explosion test system parameters through the touch screen. The touch screen sends control commands to the system through the PLC to control the gas distribution module to introduce explosive gas into the explosion-proof test chamber and adjust the gas concentration. The gas analysis unit determines whether the gas concentration meets the requirements. If it does not meet the requirements, the PLC controls the gas distribution module to adjust the gas concentration again. If it meets the requirements, proceed to step S4 to prepare for the explosion test. Step S4: Start the ignition module to conduct an explosion test, and collect test data through the parameter test module and transient response thermocouple, and collect explosion flame images through an explosion-proof high-speed camera; Step S5: The signal processing circuit converts the test data from the parameter testing module and the transient response thermocouple and transmits it to the digital signal processor for calculation and processing to obtain the pressure, stress, strain and temperature data of the explosion process. The data is then transmitted to the industrial computer, which calculates the heat flux density based on the temperature data. The acquired images of the explosion flames are transmitted to an industrial computer. The industrial computer processes the images to obtain the flame propagation characteristics along the explosion path. The image processing method of the industrial computer specifically includes the following steps: Step S501: The industrial computer opens the image processing software, imports the exploded image, performs grayscale processing, and obtains a grayscale image with uniform pixels. Step S502, using The operator performs edge detection, adjusts the noise threshold, and deletes the image outside the explosion flame to obtain the explosion flame image of the explosion-proof equipment prototype; Step S503: Process the flame images of the explosion-proof equipment prototype at different stages of the explosion using the method in step S502 to obtain the explosion flames at different stages. Step S504: The flame front coordinates of the explosion flame images at different times are obtained by calculation, and the flame front propagation speed is calculated by the time interval and the flame front coordinates. Step S505: Calculate the duration of the explosion using the image acquisition interval and images of the flame's generation and extinguishing. The industrial computer calculates the heat flux density based on temperature data, and performs a safety assessment after transient impact based on the calculated flame front propagation speed and explosion duration, combined with pressure, stress, strain and images. Step S6: Remove the remaining gas from the explosion-proof test chamber, organize the test system equipment and the prototype of the coal mine explosion-proof equipment, and complete the explosion test.

9. The safety assessment method for the transient parameter testing system for explosion-proof equipment in coal mines as described in claim 8, characterized in that, The heat flux density in step S5 is calculated using the integral formula for heat flux density, as follows: ； In the formula: q is the surface heat flux, ρ is the density of the material, c is the specific heat of the material, k is the thermal conductivity of the material, π is 3.14, τ is the integration variable, and t represents time. s (τ) represents the surface temperature change.

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