Experimental device for measuring gas detonation

Abstract

The invention belongs to the technical field of coal mine gas quantity experimental equipment, and particularly relates to an experimental device for measuring gas detonation, which comprises a bracket and an experimental box, and the experimental box is connected with an electronic igniter, visible glass and a flow guide pipe; flow guide holes are formed in the flow guide pipes; the bracket is connected with an electric push rod; the electric push rod is connected with a connecting plate; the connecting plate is connected with a gas assembly, an oxygen assembly and a pulverized coal assembly, and the output ends of the gas assembly and the oxygen assembly are arranged in the flow guide holes to inject gas and oxygen into the experiment box respectively; the output end of the pulverized coal assembly is arranged in the experiment box and injects pulverized coal into the experiment box. The liquid nitrogen has an extremely strong cooling effect and can effectively reduce the deep temperature of comburent and greatly reduce the probability of re-combustion, and the liquid nitrogen sprayed after pressurization has strong airflow and can restrain raising of pulverized coal, so that the risk of secondary dust raising explosion possibly caused during fire extinguishing is avoided, and the safety of fire extinguishing is improved. And the personal safety of workers entering an experiment site after the explosion experiment is completed is more effectively guaranteed.

Description

Technical Field

[0001] This invention belongs to the technical field of coal mine gas quantity testing equipment, specifically an experimental device for determining gas ignition. Background Technology

[0002] Coal mine gas is one of the main threats to safe production in mines. A certain concentration of gas underground, the presence of high-temperature ignition sources, and sufficient oxygen are necessary conditions for a gas explosion accident. The consequences of a gas explosion during coal mine operations are unimaginable. Therefore, strict monitoring and measurement of gas levels are required during coal mine operations. In addition, experiments are conducted first to simulate whether the gas level can trigger an explosion.

[0003] However, the above-mentioned technologies often have the following drawbacks. After the explosion experiment is completed, it is generally necessary for the experimental personnel to enter the site to check and record. However, there is still a risk of secondary explosion after the explosion experiment. In order to better protect the personal safety of the experimental personnel and avoid the risk of secondary explosion, an experimental device for determining gas ignition is proposed to address the above problems. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, at least one technical problem mentioned in the background art has been solved.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows: An experimental device for determining gas explosion according to this invention includes a support and an experimental chamber. The experimental chamber is connected to an electronic igniter, a viewing glass, and a flow guide tube. The flow guide tube has a flow guide hole. The support is connected to an electric push rod, a high-pressure liquid nitrogen fire extinguishing assembly, a camera, a combustible gas detector, a high-speed flame detector, a high-frequency pressure sensor, an audible and visual alarm, a dust concentration monitor, and an oxygen concentration sensor. The electric push rod is connected to a connecting plate. The connecting plate is connected to a gas assembly, an oxygen assembly, and a coal powder assembly. The output ends of the gas assembly and the oxygen assembly are both placed in the flow guide hole, respectively injecting gas and oxygen into the experimental chamber. The output end of the coal powder assembly is placed inside the experimental chamber, injecting coal powder into the experimental chamber.

[0006] Preferably, the high-pressure liquid nitrogen fire extinguishing assembly includes a liquid nitrogen tank fixedly connected to a bracket, the liquid nitrogen tank being connected to a conduit, the conduit being connected to a booster pump, a diversion pipe and a one-way valve, the diversion pipe being connected to a plurality of spray pipes, and the spray direction of the spray pipes all being towards the test chamber.

[0007] Preferably, the guide pipe has a gas port and an oxygen port, the experimental chamber has a coal powder port, the gas port is adapted to the gas component, the oxygen port is adapted to the oxygen component, the coal powder port is adapted to the coal powder component, and the outer surface of the experimental chamber is covered with an explosion-proof isolation plate.

[0008] Preferably, the gas assembly includes a gas hose connected to a gas rigid pipe, the gas rigid pipe being connected to a one-way valve, the output end of the gas rigid pipe being located inside the guide hole when outputting gas, and the gas rigid pipe being snapped into the gas port, and the gas rigid pipe being fixedly connected to the connecting plate.

[0009] Preferably, the oxygen assembly includes an oxygen hose connected to an oxygen rigid tube, the oxygen rigid tube connected to a one-way valve, the oxygen rigid tube having an oxygen outlet, the oxygen outlet being located inside the guide hole and facing the experimental chamber when outputting oxygen, the oxygen rigid tube being snapped into the oxygen port, and the oxygen rigid tube being fixedly connected to the connecting plate.

[0010] Preferably, the pulverized coal assembly includes a pulverized coal hose connected to a pulverized coal rigid pipe, which is connected to a pulverized coal one-way valve. When pulverized coal is output, the output end of the pulverized coal rigid pipe is located inside the experimental chamber and above the output end of the guide hole. The pulverized coal rigid pipe is fixedly connected to the connecting plate.

[0011] Preferably, a gas blocking plate is provided inside the flow guide hole, and a spring connected to the flow guide pipe is connected directly below the gas blocking plate. The gas blocking plate is adapted to the gas inlet, and a gas connecting rod is provided at the bottom of the gas rigid pipe.

[0012] Preferably, an oxygen blocking plate is provided inside the flow guide hole, and a spring connected to the flow guide tube is connected directly below the oxygen blocking plate. The oxygen blocking plate is adapted to the oxygen port.

[0013] Preferably, the experimental chamber is equipped with a coal powder sealing plate, a spring is provided at the center of the lower surface of the coal powder sealing plate, the coal powder sealing plate is adapted to the coal powder hole, and a coal powder connecting rod is connected to the lower surface of the coal powder rigid pipe.

[0014] Preferably, the upper surface of the coal powder sealing plate is inclined, and the inner wall of the experimental chamber is provided with a snap-fit ​​groove that is adapted to the coal powder sealing plate.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. The experimental device for determining gas explosion described in this invention uses a controller to activate a high-pressure liquid nitrogen fire extinguishing component to extinguish the fire in the experimental chamber. Liquid nitrogen has a strong cooling effect, which can effectively reduce the deep temperature of the burning material, greatly reducing the chance of reignition. Furthermore, the pressurized liquid nitrogen sprayed out has a strong airflow that can suppress coal dust from rising, avoiding the risk of secondary dust explosions that may be caused during fire extinguishing, and more effectively ensuring the personal safety of personnel entering the experimental site after the explosion experiment is completed.

[0017] 2. The experimental device for determining gas explosion described in this invention uses an electric push rod to drive a connecting plate to move upward linearly. The connecting plate drives the gas assembly, oxygen assembly, and pulverized coal assembly to move upward linearly simultaneously. The gas assembly and oxygen assembly gradually separate from the guide pipe, and the pulverized coal assembly gradually separates from the experimental chamber, blocking the connection between the gas, oxygen, and pulverized coal injection routes, effectively preventing a wider range of experimental explosion. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is the front view in this invention;

[0021] Figure 3 This is a cross-sectional view of the experimental chamber in this invention;

[0022] Figure 4 This is a cross-sectional view of the guide tube in this invention;

[0023] Figure 5 This is a three-dimensional structural diagram of the experimental chamber in this invention.

[0024] In the diagram: 1. Support frame; 20. Experimental chamber; 21. Guide tube; 22. Gas inlet; 23. Oxygen inlet; 24. Pulverized coal hole; 25. Guide hole; 26. Explosion-proof isolation plate; 27. Visible glass; 30. Electric push rod; 31. Connecting plate; 40. Gas hose; 41. Gas rigid pipe; 42. One-way valve one; 43. Gas connecting rod; 401. Gas blocking plate; 402. Spring one; 50. Oxygen hose; 51. Oxygen rigid pipe; 52. One-way valve two; 53. Oxygen outlet; 501. Oxygen blocking plate; 502. Spring 2; 60. Pulverized coal hose; 61. Pulverized coal rigid pipe; 62. Pulverized coal check valve; 63. Pulverized coal connecting rod; 601. Pulverized coal sealing plate; 602. Spring 3; 603. Snap-fit ​​groove; 70. Liquid nitrogen tank; 71. Conduit; 72. Booster pump; 73. Diverter pipe; 74. Spray pipe; 75. Check valve 3; 80. Electronic igniter; 2. Camera; 3. Combustible gas detector; 4. High-speed flame detector; 5. High-frequency pressure sensor; 6. Audible and visual alarm; 7. Dust concentration monitor; 8. Oxygen concentration sensor. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0026] Example: Figures 1 to 5As shown in the embodiment of the present invention, an experimental device for determining gas explosion includes a support 1 and an experimental chamber 20. The experimental chamber 20 is connected to an electronic igniter 80, a viewing glass 27, and a guide tube 21. The guide tube 21 has a guide hole 25. The support 1 is connected to an electric push rod 30, a high-pressure liquid nitrogen fire extinguishing assembly, a camera 2, a combustible gas detector 3, a high-speed flame detector 4, a high-frequency pressure sensor 5, an audible and visual alarm 6, a dust concentration monitor 7, and an oxygen concentration sensor 8. The electric push rod 30 is connected to a connecting plate 31. The connecting plate 31 is connected to a gas assembly, an oxygen assembly, and a coal powder assembly. The output ends of the gas assembly and the oxygen assembly are both located in the guide hole 25. Gas and oxygen are injected into the experimental chamber 20 respectively. The output end of the pulverized coal assembly is placed inside the experimental chamber 20, and pulverized coal is injected into it. During operation, the controller is activated according to the data settings to start the experimental device. Then, the electric push rod 30 pushes the connecting plate 31 downward linearly. The connecting plate 31 drives the gas assembly, oxygen assembly, and pulverized coal assembly to move downward linearly synchronously until the output ends of the gas and oxygen assemblies are both inside the guide hole 25 and the output end of the pulverized coal assembly is inside the experimental chamber 20. Then, the oxygen and gas from the experimental explosion are quantitatively input into the guide hole 25 through the gas and oxygen assemblies and enter the experimental chamber 20. At the same time, the quantitative pulverized coal assembly injects the gas into the experimental chamber 20. The coal powder is fed into the experimental chamber 20. After quantitative input, the gas, oxygen, and coal powder components are shut off to stop the input. Then, the electric push rod 30 drives the connecting plate 31 to move upward linearly. The connecting plate 31 drives the gas, oxygen, and coal powder components to move upward linearly simultaneously. The gas and oxygen components gradually separate from the guide pipe 21, and the coal powder component gradually separates from the experimental chamber 20. The combustible gas detector 3 monitors in real time to prevent gas leaks and accidents. The oxygen concentration sensor 8 confirms that the environment is safe. Then, the controller activates the audible and visual alarm 6 to warn people not to approach. Then, the electronic igniter 80 is activated for ignition. The high-speed flame detector 4 can confirm the open flame. At this point, the experimental chamber 20 is in an explosive state. The high-frequency pressure sensor 5 can monitor the explosion intensity, the dust concentration monitor 7 can monitor the dust cloud generated by the explosion, and the camera 2 performs real-time video recording. After the experimental data of monitoring the gas explosion is collected, the controller activates the high-pressure liquid nitrogen fire extinguishing component to extinguish the fire in the experimental chamber 20. Liquid nitrogen has a strong cooling effect, which can effectively reduce the deep temperature of the burning material and greatly reduce the probability of reignition. Moreover, the liquid nitrogen sprayed after pressurization has a strong airflow that can suppress coal dust from rising, avoiding the risk of secondary dust explosion that may be caused during fire extinguishing, and more effectively ensuring the personal safety of personnel entering the experimental site after the explosion experiment.

[0027] Furthermore, the high-pressure liquid nitrogen fire extinguishing assembly includes a liquid nitrogen tank 70 fixedly connected to the bracket 1. The liquid nitrogen tank 70 is connected to a conduit 71, which is connected to a booster pump 72, a diversion pipe 73, and a one-way valve 75. The diversion pipe 73 is connected to several spray pipes 74, all of which spray towards the experimental chamber 20. When fire extinguishing is required, the controller activates and opens the booster pump 72 and the one-way valve 75. The liquid nitrogen stored in the liquid nitrogen tank 70 is then sprayed through the conduit 71, the diversion pipe 73, and the spray pipes 74 to the experimental chamber 20. The liquid nitrogen sprayed into the experimental chamber 20 has a strong cooling effect, which can effectively reduce the deep temperature of the burning material and greatly reduce the chance of reignition. In the coal mine operation scenario, the coal dust content is relatively large. Therefore, to better fit this scenario, a booster pump 72 is set to pressurize the liquid nitrogen. The liquid nitrogen sprayed after pressurization has a strong airflow that can suppress the coal dust from being lifted, avoiding the risk of secondary dust explosion that may be caused during fire extinguishing, and more effectively ensuring the personal safety of personnel entering the experimental site after the explosion experiment is completed.

[0028] Furthermore, the guide pipe 21 has a gas port 22 and an oxygen port 23, and the experimental chamber 20 has a coal powder port 24. The gas port 22 is compatible with the gas component for easy connection, the oxygen port 23 is compatible with the oxygen component for easy connection, and the coal powder port 24 is compatible with the coal powder component for easy connection. The outer surface of the experimental chamber 20 is covered with an explosion-proof isolation plate 26, which serves as an isolation to prevent the experimental explosion from affecting a wider area.

[0029] Furthermore, the gas assembly includes a gas hose 40, which is connected to a gas hard pipe 41. The gas hard pipe 41 is connected to a one-way valve 42. When gas is output, the output end of the gas hard pipe 41 is located inside the guide hole 25, and the gas hard pipe 41 is engaged with the gas port 22. The gas hard pipe 41 is fixedly connected to the connecting plate 31.

[0030] The gas hose 40 has good ductility. The input end of the gas hose 40 is connected to an external gas tank (the external gas tank is located in a distant external space, not shown in the figure). The gas hose 40 can shrink its extended length along with the displacement of the gas hard pipe 41. During the preparation work for gas injection, the electric push rod 30 pushes the connecting plate 31 to move linearly downward. The connecting plate 31 drives the gas hard pipe 41 and the one-way valve 42 to move linearly downward until the output end of the gas hard pipe 41 is located inside the guide hole 25. The controller starts and opens the one-way valve 42. The gas in the external gas tank is gradually and quantitatively injected into the guide hole 25 through the gas hose 40 and the gas hard pipe 41. It then enters the experimental chamber 20 from the guide hole 25, which makes it easier for the experiment to more closely simulate the real coal mine gas content.

[0031] After the gas injection operation is completed, the controller closes the one-way valve 42, the electric push rod 30 drives the connecting plate 31 to move upward in a straight line, the connecting plate 31 drives the gas hard pipe 41 and the one-way valve 42 to move upward in a straight line, the output end of the gas hard pipe 41 gradually separates from the guide pipe 21, blocking the connection of the gas injection route, effectively avoiding a wider range of experimental explosion.

[0032] Furthermore, the oxygen assembly includes an oxygen hose 50, which is connected to an oxygen rigid tube 51. The oxygen rigid tube 51 is connected to a one-way valve 52. The oxygen rigid tube 51 has an oxygen outlet 53. When outputting oxygen, the oxygen outlet 53 is located inside the guide hole 25 and faces the experimental chamber 20. The oxygen rigid tube 51 is snapped into the oxygen port 23. The oxygen rigid tube 51 is fixedly connected to the connecting plate 31.

[0033] The oxygen hose 50 has good extensibility. The input end of the oxygen hose 50 is connected to an external oxygen tank (the external oxygen tank is located in a distant external space, not shown in the figure). The oxygen hose 50 can shrink its extended length along with the displacement of the oxygen tube 51. During the preparation work for the oxygen injection operation, the electric push rod 30 pushes the connecting plate 31 to move linearly downward. The connecting plate 31 drives the oxygen tube 51 and the one-way valve 52 to move linearly downward until the output end of the oxygen tube 51 is located inside the guide hole 25. The controller starts and opens the one-way valve 52. The oxygen in the external oxygen tank is gradually and quantitatively injected into the guide hole 25 through the oxygen hose 50 and the oxygen tube 51. It then enters the experimental chamber 20 from the guide hole 25, which makes it easier for the experiment to more closely simulate the real oxygen content in coal mines.

[0034] After the oxygen injection operation is completed, the controller closes the one-way valve 2 52, the electric push rod 30 drives the connecting plate 31 to move upward in a straight line, the connecting plate 31 drives the oxygen hard tube 51 and the one-way valve 2 52 to move upward in a straight line, the output end of the oxygen hard tube 51 gradually separates from the guide tube 21, blocking the connection of the oxygen injection route, effectively avoiding a wider range of experimental explosion.

[0035] Furthermore, the pulverized coal assembly includes a pulverized coal hose 60, which is connected to a pulverized coal hard pipe 61. The pulverized coal hard pipe 61 is connected to a pulverized coal check valve 62. When pulverized coal is output, the output end of the pulverized coal hard pipe 61 is located inside the experimental chamber 20 and above the output end of the guide hole 25. The pulverized coal hard pipe 61 is fixedly connected to the connecting plate 31.

[0036] The pulverized coal hose 60 has good ductility. The input end of the pulverized coal hose 60 is connected to the external pulverized coal box (the external pulverized coal box is located in a distant external space, not shown in the figure). The pulverized coal hose 60 can shrink its extended length along with the displacement of the pulverized coal hard pipe 61. During the preparation work for injecting pulverized coal, the electric push rod 30 pushes the connecting plate 31 to move linearly downward. The connecting plate 31 drives the pulverized coal hard pipe 61 and the pulverized coal one-way valve 62 to move linearly downward until the output end of the pulverized coal hard pipe 61 is inside the experimental chamber 20 and above the output end of the guide hole 25. The controller starts and opens the pulverized coal one-way valve 62. The pulverized coal in the external pulverized coal box is gradually and quantitatively injected into the experimental chamber 20 by the pulverized coal hose 60 and the pulverized coal hard pipe 61. This makes it easier for the experiment to more closely simulate the pulverized coal content of real coal mines. The gas and oxygen output in the guide hole 25 can just blow the pulverized coal injected at this position. There is no need to add other mixing equipment. The pulverized coal, gas and oxygen can achieve good mixing and save economic costs.

[0037] After the coal powder injection operation is completed, the controller closes the coal powder check valve 62, the electric push rod 30 drives the connecting plate 31 to move upward in a straight line, the connecting plate 31 drives the coal powder hard pipe 61 and the coal powder check valve 62 to move upward in a straight line, the output end of the coal powder hard pipe 61 gradually separates from the experimental box 20, blocking the connection of the coal powder injection route, effectively avoiding a wider range of experimental explosion.

[0038] Furthermore, a gas blocking plate 401 is provided inside the flow guide hole 25. A spring 402 connected to the flow guide pipe 21 is connected directly below the gas blocking plate 401. The gas blocking plate 401 is adapted to the gas port 22. A gas connecting rod 43 is provided at the bottom of the gas rigid pipe 41. In the initial state, the spring 402 is in the extended state and pushes the upper surface of the gas blocking plate 401 to fit against the lower surface of the gas port 22, thereby playing a blocking role and preventing external debris from falling into the flow guide hole 25.

[0039] During the preparation work for gas injection, the gas hard pipe 41 drives the gas connecting rod 43 to move downward in a straight line. During the downward linear movement of the gas connecting rod 43, it first contacts the upper surface of the gas blocking plate 401 and continues to press downward, while the spring 402 is gradually compressed until the outlet of the gas hard pipe 41 is located inside the guide hole 25 and the gas injection operation can be carried out.

[0040] After the gas injection operation is completed, as the gas rigid pipe 41 drives the gas connecting rod 43 to move upward linearly and gradually separate from the guide pipe 21, the spring 402 gradually extends, and the gas blocking plate 401 gradually moves upward and closes to the outside of the experimental chamber 20 and the guide pipe 21, thus playing a blocking role and preventing the gas from flowing out to the outside of the experimental chamber 20 and the guide pipe 21.

[0041] Furthermore, an oxygen blocking plate 501 is provided inside the guide hole 25. A spring 502 connected to the guide tube 21 is connected directly below the oxygen blocking plate 501. The oxygen blocking plate 501 is adapted to the oxygen port 23. In the initial state, the spring 502 is in the extended state and pushes the upper surface of the oxygen blocking plate 501 to fit against the lower surface of the oxygen port 23, thereby blocking the flow and preventing external debris from falling into the guide hole 25.

[0042] During the preparation work for oxygen injection, the oxygen rigid tube 51 moves downward in a straight line. During the downward straight line movement of the oxygen rigid tube 51, it first contacts the upper surface of the oxygen sealing plate 501 and continues to press downward, while the spring 2 502 is gradually compressed until the oxygen outlet 53 is located inside the guide hole 25 and the oxygen injection operation can be carried out.

[0043] After the oxygen injection operation is completed, as the oxygen rigid tube 51 moves upward in a straight line and gradually separates from the guide tube 21, the spring 2 502 gradually extends, and the oxygen sealing plate 501 moves upward and fits against the lower surface of the oxygen port 23, thus sealing off the oxygen and preventing it from flowing out of the experimental chamber 20 and the outside of the guide tube 21.

[0044] Furthermore, the experimental chamber 20 is equipped with a coal powder sealing plate 601, and a spring 602 is installed at the center of the lower surface of the coal powder sealing plate 601. The coal powder sealing plate 601 is adapted to the coal powder hole 24, and a coal powder connecting rod 63 is connected to the lower surface of the coal powder rigid tube 61. In the initial state, the spring 602 is in the extended state and pushes the upper surface of the coal powder sealing plate 601 to fit against the lower surface of the coal powder hole 24, thereby sealing the coal powder and preventing external debris from falling into the experimental chamber 20.

[0045] During the preparation work for the coal powder injection operation, the coal powder rigid pipe 61 drives the coal powder connecting rod 63 to move downward in a straight line. During the downward linear displacement process, the coal powder connecting rod 63 first contacts the upper surface of the coal powder blocking plate 601 and continues to press downward, while the spring 602 is gradually compressed until the upper surface of the coal powder blocking plate 601 is moved to below the output port of the guide hole 25.

[0046] After the coal powder injection is completed, as the coal powder rigid pipe 61 drives the coal powder connecting rod 63 to move upward linearly and gradually separate from the experimental box 20, the spring 602 gradually extends during the upward linear displacement of the coal powder connecting rod 63, and the coal powder sealing plate 601 gradually moves upward and fits against the lower surface of the coal powder hole 24, thus sealing and preventing the coal powder from flowing out of the experimental box 20 and the outside of the guide pipe 21.

[0047] The upper surface of the coal powder blocking plate 601 is inclined to facilitate the sliding of coal powder falling on the upper surface of the coal powder blocking plate 601; the inner wall of the test chamber 20 is provided with a snap-fit ​​groove 603, which is adapted to the coal powder blocking plate 601 to facilitate the smooth movement of the coal powder blocking plate 601 with the snap-fit ​​groove 603.

[0048] The electric push rod 30, one-way valve three 75, one-way valve one 42, one-way valve two 52, booster pump 72, electronic igniter 80, camera 2, combustible gas detector 3, high-speed flame detector 4, high-frequency pressure sensor 5, audible and visual alarm 6, dust concentration monitor 7, and oxygen concentration sensor 8 are all electrically connected to the controller and are all existing known devices. This invention does not improve upon them, so they will not be described in detail. All electrical devices required in this invention are electrically connected to an external power source.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An experimental apparatus for determining gas ignition, comprising a support (1) and an experimental chamber (20), wherein the experimental chamber (20) is connected to an electronic igniter (80), a viewing glass (27), and a flow guide (21); characterized in that: The guide tube (21) is provided with a guide hole (25); The bracket (1) is connected to an electric push rod (30), a high-pressure liquid nitrogen fire extinguishing assembly, a camera (2), a combustible gas detector (3), a high-speed flame detector (4), a high-frequency pressure sensor (5), an audible and visual alarm (6), a dust concentration monitor (7), and an oxygen concentration sensor (8). The electric push rod (30) is connected to a connecting plate (31); The connecting plate (31) is connected to the gas assembly, oxygen assembly and coal powder assembly. The output ends of the gas assembly and the oxygen assembly are both placed in the guide hole (25) to inject gas and oxygen into the experimental chamber (20) respectively. The output end of the pulverized coal assembly is placed inside the experimental chamber (20), and pulverized coal is injected into the experimental chamber (20).

2. The experimental apparatus for determining gas explosion according to claim 1, characterized in that: The high-pressure liquid nitrogen fire extinguishing assembly includes a liquid nitrogen tank (70) fixedly connected to the bracket (1). The liquid nitrogen tank (70) is connected to a conduit (71). The conduit (71) is connected to a booster pump (72), a diversion pipe (73), and a one-way valve (75). The diversion pipe (73) is connected to several spray pipes (74). The spray direction of the spray pipes (74) is all towards the experimental chamber (20).

3. The experimental apparatus for determining gas explosion according to claim 2, characterized in that: The guide pipe (21) has a gas port (22) and an oxygen port (23). The experimental chamber (20) has a coal powder hole (24). The gas port (22) is compatible with the gas component. The oxygen port (23) is compatible with the oxygen component. The coal powder hole (24) is compatible with the coal powder component. The outer surface of the experimental chamber (20) is covered with an explosion-proof isolation plate (26).

4. The experimental apparatus for determining gas explosion according to claim 3, characterized in that: The gas assembly includes a gas hose (40), which is connected to a gas hard pipe (41). The gas hard pipe (41) is connected to a one-way valve (42). When gas is output, the output end of the gas hard pipe (41) is located inside the guide hole (25), and the gas hard pipe (41) is engaged with the gas port (22). The gas hard pipe (41) is fixedly connected to the connecting plate (31).

5. The experimental apparatus for determining gas explosion according to claim 4, characterized in that: The oxygen assembly includes an oxygen hose (50), which is connected to an oxygen tube (51). The oxygen tube (51) is connected to a one-way valve (52). The oxygen tube (51) has an oxygen outlet (53). When outputting oxygen, the oxygen outlet (53) is located inside the guide hole (25) and faces the experimental chamber (20). The oxygen tube (51) is snapped into the oxygen port (23). The oxygen tube (51) is fixedly connected to the connecting plate (31).

6. The experimental apparatus for determining gas explosion according to claim 5, characterized in that: The coal powder assembly includes a coal powder hose (60), which is connected to a coal powder hard pipe (61). The coal powder hard pipe (61) is connected to a coal powder one-way valve (62). When outputting coal powder, the output end of the coal powder hard pipe (61) is located inside the experimental chamber (20) and above the output end of the guide hole (25). The coal powder hard pipe (61) is fixedly connected to the connecting plate (31).

7. The experimental apparatus for determining gas explosion according to claim 6, characterized in that: The guide hole (25) is provided with a gas blocking plate (401), and a spring (402) connected to the guide pipe (21) is connected directly below the gas blocking plate (401). The gas blocking plate (401) is adapted to the gas port (22), and a gas connecting rod (43) is provided at the bottom of the gas hard pipe (41).

8. The experimental apparatus for determining gas explosion according to claim 7, characterized in that: An oxygen blocking plate (501) is provided inside the flow guide hole (25). A spring (502) connected to the flow guide pipe (21) is connected directly below the oxygen blocking plate (501). The oxygen blocking plate (501) is adapted to the oxygen port (23).

9. The experimental apparatus for determining gas explosion according to claim 8, characterized in that: The experimental chamber (20) is equipped with a coal powder sealing plate (601). A spring (602) is provided at the center of the lower surface of the coal powder sealing plate (601). The coal powder sealing plate (601) is adapted to the coal powder hole (24). A coal powder connecting rod (63) is connected to the lower surface of the coal powder hard tube (61).

10. The experimental apparatus for determining gas explosion according to claim 9, characterized in that: The upper surface of the coal powder sealing plate (601) is inclined, and the inner wall of the experimental box (20) is provided with a snap-fit ​​groove (603), which is adapted to the coal powder sealing plate (601).

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