Automatic experimental device and experimental method for high-pressure combustion of solid powder

Abstract

The invention relates to the technical field of experimental devices for combustion performance of energetic materials, in particular to an automatic experimental device and method for high-pressure combustion of solid powder, and the automatic experimental device comprises a gas storage bottle for storing gas with required pressure, a visual tube furnace, a camera, a control unit and a quartz tube, one end of the quartz tube is provided with a variable-diameter nozzle pipe orifice, the variable-diameter nozzle pipe orifice is communicated with the output end of the gas storage bottle, a one-way valve is arranged between the variable-diameter nozzle pipe orifice and the gas storage bottle, the visual tubular furnace is used for heating the quartz tube, and the control unit is used for controlling the automatic sample feeding device to feed samples. The camera records the phenomenon in the quartz tube and transmits the record to the control unit for storage and analysis, so that automatic stable combustion and image acquisition of the solid powder under high pressure are realized, an ignition device is not needed, the solid powder can be tested at different temperatures and pressures, and the safety and stability of the test are ensured by multi-stage pressure relief.

Description

Technical Field

[0001] The invention relates to the technical field of energetic material combustion performance experimental devices, in particular to an automatic experimental device and an experimental method for high-pressure combustion of solid powder. Background Art

[0002] Aluminum powder and other high calorific value metal powders are widely used in the field of high-energy solid fuels. At present, the ignition methods used to study the ignition and combustion performance of solid fuel powders mainly include shock tube ignition, flat flame burner ignition, tubular furnace ignition, laser ignition, etc. The combustion experimental device using Bunsen furnace ignition generally has the disadvantages of cumbersome operation, long waiting time, and poor experimental continuity. Tubular furnace ignition is widely used in the ignition and combustion experiments of solid fuel powders because of its high ignition temperature, fast heating rate, high safety and other advantages. At present, most common tubular furnaces are fully closed with simple structures, which cannot meet the visualization and automatic sample delivery requirements required for solid powder high-pressure combustion experiments.

[0003] The utility model patent with Chinese patent application number 201420111794.4 discloses a visual tube furnace. The experimental device of this invention can clearly observe the position and operation process of the heated sample and thermocouple, but it cannot meet the specific needs of the high-voltage ignition combustion experiment, and requires a built-in ignition mechanism, which makes its actual use have certain limitations. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to solve the problem that the prior art cannot meet the specific needs of high-pressure ignition and combustion experiments, and requires a built-in ignition mechanism, which makes actual use have certain limitations, an automatic experimental device and experimental method for high-pressure combustion of solid powder are provided.

[0005] The technical solution adopted by the present invention to solve its technical problem is: an automatic experimental device for high-pressure combustion of solid powder, comprising a gas storage bottle for storing required pressure gas, a visual tube furnace, a camera, a control unit and a quartz tube, one end of the quartz tube is provided with a reducing nozzle nozzle, the reducing nozzle nozzle is connected to the output end of the gas storage bottle, a one-way valve is provided between the reducing nozzle nozzle and the gas storage bottle, the other end of the quartz tube passes through the visual tube furnace, the other end of the quartz tube is provided with a one-way pressure relief device and an automatic sample delivery device, the automatic sample delivery device is used to deliver the sample to the quartz tube located at the center of the visual tube furnace for experiment, the one-way pressure relief device is located between the visual tube furnace and the automatic sample delivery device, the one-way pressure relief device is used to relieve pressure in the quartz tube, the camera is used to face the visual tube furnace, and the camera and the automatic sample delivery device are both connected to the control unit signal.

[0006] The one-way pressure relief device includes a pressure relief cylinder, the pressure relief cylinder has a main channel and a pressure relief channel connected to the main channel, one end of the main channel is connected to the other end of the quartz tube, the other end of the main channel is connected to the automatic sample feeding device, the outlet end of the pressure relief channel is provided with a bursting disc, and the pressure relief channel is provided with a first buffer pressure relief mechanism, a second buffer pressure relief mechanism and a third buffer pressure relief mechanism in sequence from one end to the bursting disc, the first buffer pressure relief mechanism is used to buffer and absorb the impact force entering the pressure relief channel, the second buffer pressure relief mechanism is used to buffer and absorb the impact force of the first buffer pressure relief mechanism, and the third buffer pressure relief mechanism is used to buffer and absorb the impact force of the second buffer pressure relief mechanism. Compared with the prior art, this solution heats the quartz tube through a visual tube furnace, controls the automatic sample feeding device to feed the sample through a control unit, records the phenomenon in the quartz tube by a camera, and transmits the record to the control unit for storage and analysis, without the need for an ignition device, and meets the requirements of solid powder experiments at different temperatures and pressures, and multi-stage pressure relief ensures the safety and stability of the experiment.

[0007] In order to facilitate the manufacture of the pressure relief cylinder and the subsequent maintenance of the pressure relief cylinder, some embodiments are preferably implemented in which the pressure relief cylinder includes a lower cylinder body, an upper cylinder body and a top cover which are fixedly connected in sequence, the main channel is arranged on the lower cylinder body, a first channel is arranged on the lower cylinder body, a second channel is arranged on the upper cylinder body, the top cover is an annular structure, the bursting disc is fixed to the upper cylinder body through the top cover, and a pressure relief channel is formed between the first channel and the second channel.

[0008] In order to realize the first pressure relief mechanism, some embodiments are preferred, wherein the first pressure relief mechanism includes a valve stem, a valve core and a spring, one end of the valve stem is fixedly connected to the upper cylinder body, one end of the valve core is set against one end of the pressure relief channel close to the main channel, the valve core is used to block the pressure relief channel and the main channel, one end of the spring is set on the valve stem, and the other end of the spring is set on the valve core. The valve core is always set against one end of the pressure relief channel by the spring, and when it receives an impact, it drives the valve core to move and squeeze the spring, thereby achieving impact buffering and energy absorption, and reducing the impact force.

[0009] In order to realize the second pressure relief mechanism, some preferred embodiments include the second buffer pressure relief mechanism comprising a first pressure relief plate, the first pressure relief plate being fixed between the upper cylinder body and the lower cylinder body, the first pressure relief plate being provided with a first pressure relief hole, the first pressure relief plate separating the upper cylinder body and the lower cylinder body from each other, and the first pressure relief hole connecting the first flow channel with the second flow channel.

[0010] In order to realize the third pressure relief mechanism, some preferred embodiments are that the third buffer pressure relief mechanism includes a second pressure relief plate, the second pressure relief plate is fixed between the upper cylinder body and the top cover, the second pressure relief plate is provided with a second pressure relief hole, the second pressure relief plate separates the upper cylinder body and the top plate from each other, and the first pressure relief hole connects the second flow channel and the bursting disc.

[0011] In order to ensure the stability of the sample experiment, in some preferred embodiments, a cooling channel is provided on the pressure relief cylinder, and the cooling channel is used to cool the sample in the main channel and ensure that the sample does not change its characteristics. By providing a cooling channel on the pressure relief cylinder, the cooling channel absorbs part of the heat, ensuring that the characteristics will not change during the sample placement process until the sample is stably transported to the desired position.

[0012] In some preferred embodiments, the cooling channel is arranged around the main channel and is spiral, one end of the cooling channel is an input port, and one end of the cooling channel is an output port.

[0013] In order to realize the automatic sample delivery device, some preferred embodiments include a shell and a sample placement table for placing samples, the shell is fixedly mounted on the one-way pressure relief device, and the shell is provided with a conveying mechanism for placing the sample placement table at a desired position.

[0014] In some preferred embodiments, the conveying mechanism includes a screw and a motor, the motor is fixedly mounted on a shell, a through hole matching the screw is provided on the shell, the sample placement table is provided on the screw, the screw is arranged opposite to the quartz tube, one end of the screw is arranged in the through hole, a large gear is provided on the output end of the motor, a rotatable small gear is installed in the shell, the small gear is threadedly connected to the screw, the large gear and the small gear are meshed with each other, a limiting groove is provided on the screw along its axial direction, a limiting block matching the limiting groove is provided on the shell, and the limiting block is arranged in the limiting groove.

[0015] An automatic experimental device and experimental method for high-pressure combustion of solid powder as described above are characterized in that the specific operating steps are as follows:

[0016] S1. Sample arrangement: During the experimental preparation stage, place metal solid powder on the sample placement table, install each experimental component in place, and check the air tightness of the device;

[0017] S2. Experimental parameter setting. After all experimental components are connected, remove the top cover, open the gas storage bottle and purge the inside of the quartz tube for three to five minutes. After the purge is completed, install the top cover, turn on the visual tube furnace according to the set temperature program to heat the furnace body, and then pass cooling water into the cooling channel to ensure the stability of the sample in the area to be tested. Then open the gas storage bottle and slowly pass gas into the quartz tube according to the set pressure condition. After the temperature and pressure inside the visual tube furnace reach the required experimental conditions, close the gas storage bottle and wait for further experiments.

[0018] S3. Experimental data collection: When the automatic sample delivery device delivers the sample to the desired position through remote control of the motor by the control unit, the image data of the solid powder ignition and combustion process is collected through the camera. The camera is started in conjunction with the automatic sample delivery device through the built-in program of the control unit to record the entire ignition and combustion process at a shooting frame rate of 5000FPS / s.

[0019] S4, pressure relief and exhaust. Under the experimental state, if the pressure in the quartz tube is greater than the triggering pressure of the bursting disc, the bursting disc will burst at the specified pressure to release the pressure in the tube. If the bursting disc is not triggered, the top cover is manually opened to exhaust and relieve pressure, replace the sample or experimental atmosphere, and repeat the above steps S1-S4.

[0020] The beneficial effects of the present invention are:

[0021] 1. The device has a simple structure, is easy to operate, and reduces safety hazards in the laboratory. You only need to place the weighed sample on the sample table and complete the solid powder combustion experiment through the automatic sample feeding device. The combustion performance of the sample can be quantitatively analyzed, and the internal environment of the sample can be kept stable, ensuring the reliability of the experiment.

[0022] 2. The experimental conditions are variable and flexible. When it is necessary to change experimental parameters such as atmosphere or pressure, you only need to replace the gas cylinder and adjust the pressure reducing valve on the gas cylinder.

[0023] 3. The experimental shooting is accurate. Researchers only need to operate according to the set control program on the control unit to complete the sample feeding, camera start and stop, and data storage. This simplifies the workload of scientific researchers to a certain extent and effectively avoids errors caused by operating multiple devices at the same time.

[0024] 4. When the automatic experimental device and experimental method for high-pressure combustion of solid powder of the present invention are used, the visual tube furnace heats the quartz tube, the control unit controls the automatic sample feeding device to feed the sample, the camera records the phenomenon in the quartz tube, and the record is transmitted to the control unit for storage and analysis, thereby realizing automatic stable combustion and image acquisition of solid powder under high pressure, without the need for an ignition device, and meeting the requirements of solid powder experiments at different temperatures and pressures. Multi-stage pressure relief ensures the safety and stability of the experiment. The device of this scheme is suitable for studying the combustion characteristics of solid powder in a visual tube furnace under various high temperatures, atmospheres and air pressures, and is convenient for systematically collecting solid combustion characteristics, ensuring the safety of the experiment and the accuracy of the experimental data, avoiding the problem that the prior art cannot meet the specific requirements of high-pressure ignition combustion experiments, and requires a built-in ignition mechanism, which makes actual use have certain limitations. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a system diagram of the automatic experimental device for solid powder combustion in the present invention;

[0027] Figure 2 It is a front view of the tube furnace experimental device in the present invention;

[0028] Figure 3 It is a cross-sectional view of the one-way pressure relief device in the present invention;

[0029] Figure 4 It is a cross-sectional view of the automatic sample feeding device in the present invention;

[0030] In the figure: 100, gas storage cylinder, 200, flow meter, 300, one-way valve, 400, visual tube furnace, 500, camera, 600, control unit;

[0031] 410. nozzle of variable diameter, 420. quartz tube, 430. visualization window, 440. tubular furnace body, 450. one-way pressure relief device, 460. automatic sample feeding device, 470. motor;

[0032] 451, lower cylinder body, 4521, first pressure relief plate, 4522, second pressure relief plate, 453, upper cylinder body, 454, top cover, 455, bursting disc, 456, valve stem, 457, spring, 458, valve core, 459, cooling channel;

[0033] 461. sample placement table, 462. housing, 463. large gear, 464. small gear, 465. screw. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with embodiments:

[0035] The present invention is not limited to the following specific embodiments. A person skilled in the art can implement the present invention in various other specific embodiments according to the contents disclosed in the present invention, or any simple changes or modifications made to the design structure and ideas of the present invention fall within the protection scope of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0038] Example 1

[0039] like Figure 1-4As shown, an automatic experimental device for high-pressure combustion of solid powder includes a gas storage bottle 100, a flow meter 200, a visualized tube furnace 400, a camera 500, a control unit 600 and a quartz tube 420. In this embodiment, the control unit 600 is a computer. The gas storage bottle 100 is used to store the required pressure gas. One end of the quartz tube 420 is provided with a reducing nozzle nozzle 410, and the reducing nozzle nozzle 410 is connected to the output end of the gas storage bottle 100. A one-way valve 300 is provided between the reducing nozzle nozzle 410 and the gas storage bottle 100. The other end of the quartz tube 420 passes through the visualized tube furnace 400. The visualized tube furnace 400 includes a tube furnace body 440 and a visualized window 430 arranged on the tube furnace body 440. The other end of the quartz tube 420 is provided with a A one-way pressure relief device 450 and an automatic sample delivery device 460 are provided. The automatic sample delivery device 460 is used to deliver samples to the quartz tube 420 located at the center of the visualized tube furnace 400 for experiments. The one-way pressure relief device 450 is located between the visualized tube furnace 400 and the automatic sample delivery device 460. The one-way pressure relief device 450 is used to release pressure in the quartz tube 420. The camera 500 is used to face the visualized tube furnace 400. The camera 500 and the automatic sample delivery device 460 are both connected to the control unit 600 by signal. Different experimental gases are adjusted through the flow meter 200, the variable diameter nozzle nozzle 410 and the one-way valve 300, and the real-time gas pressure parameters are monitored. The one-way pressure relief device 450 and the automatic sample delivery device 460 can realize driving sample delivery and rapid pressure relief after a single experiment.

[0040] The one-way pressure relief device 450 includes a pressure relief cylinder body, which has a main channel and a pressure relief channel connected to the main channel, one end of the main channel is connected to the other end of the quartz tube 420, and the other end of the main channel is connected to the automatic sample feeding device 460. A bursting piece 455 is arranged at the outlet end of the pressure relief channel, and a first buffer pressure relief mechanism, a second buffer pressure relief mechanism and a third buffer pressure relief mechanism are arranged in sequence from one end to the bursting piece 455 in the pressure relief channel. The first buffer pressure relief mechanism is used to buffer and absorb the impact force entering the pressure relief channel, the second buffer pressure relief mechanism is used to buffer and absorb the impact force of the first buffer pressure relief mechanism, and the third buffer pressure relief mechanism is used to buffer and absorb the impact force of the second buffer pressure relief mechanism.

[0041] The pressure relief cylinder includes a lower cylinder body 451, an upper cylinder body 453 and a top cover 454 which are fixedly connected in sequence, the main channel is arranged on the lower cylinder body 451, the lower cylinder body 451 is provided with a first channel, the upper cylinder body 453 is provided with a second channel, the top cover 454 is an annular structure, the bursting disc 455 is fixed on the upper cylinder body 453 through the top cover 454, and a pressure relief channel is formed between the first channel and the second channel.

[0042] The first pressure relief mechanism includes a valve stem 456, a valve core 458 and a spring 457. One end of the valve stem 456 is fixedly connected to the upper cylinder body 453, one end of the valve core 458 is disposed against one end of the pressure relief channel close to the main channel, and the valve core 458 is used to block the pressure relief channel and the main channel. One end of the spring 457 is disposed on the valve stem 456, and the other end of the spring 457 is disposed on the valve core 458.

[0043] The second buffer pressure relief mechanism includes a first pressure relief plate 4521, which is fixed between the upper cylinder body 453 and the lower cylinder body 451. The first pressure relief plate 4521 is provided with a first pressure relief hole. The first pressure relief plate 4521 separates the upper cylinder body 453 and the lower cylinder body 451 from each other, and the first pressure relief hole connects the first flow channel with the second flow channel.

[0044] The third buffer pressure relief mechanism includes a second pressure relief plate 4522, which is fixed between the upper cylinder body 453 and the top cover 454. The second pressure relief plate 4522 is provided with a second pressure relief hole. The second pressure relief plate 4522 separates the upper cylinder body 453 and the top plate from each other, and the first pressure relief hole connects the second flow channel and the bursting piece 455.

[0045] The pressure relief cylinder is provided with a cooling channel 459, and the cooling channel 459 is used to cool the sample in the main channel and ensure that the sample does not change its characteristics.

[0046] The cooling channel 459 is arranged around the main channel and is spirally shaped. One end of the cooling channel 459 is an input port, and another end of the cooling channel 459 is an output port.

[0047] The automatic sample delivery device 460 includes a housing 462 and a sample placement table 461 for placing samples. The housing 462 is fixedly mounted on the one-way pressure relief device 450 . A conveying mechanism for moving the sample placement table 461 to a desired position is disposed on the housing 462 .

[0048] The conveying mechanism includes a screw 465 and a motor 470. The motor 470 is fixedly mounted on a shell 462. A through hole matching the screw 465 is provided on the shell 462. The sample placement table 461 is arranged on the screw 465. The screw 465 is arranged opposite to the quartz tube 420. One end of the screw 465 is arranged in the through hole. A large gear 463 is arranged on the output end of the motor 470. A rotatable small gear 464 is installed in the shell 462. The small gear 464 is threadedly connected to the screw 465. The large gear 463 and the small gear 464 are meshed with each other. A limiting groove is provided on the screw 465 along its axial direction. A limiting block matching the limiting groove is provided on the shell 462. The limiting block is arranged in the limiting groove.

[0049] Example 2

[0050] Example 2 is a practical method using the device of Example 1, specifically: an automatic experimental device and experimental method for high-pressure combustion of solid powder as described above. The following is an ignition combustion experiment of aluminum / ammonium perchlorate (hereinafter referred to as Al / AP) energetic solid powder in an argon environment, with an internal environmental pressure of 0.5 MPa in a quartz tube 420 and a center temperature of 600° C. in a visualized tube furnace 400 as an example. The specific operating steps are as follows:

[0051] S1. Sample arrangement: 15-25 mg of the weighed Al / AP sample is placed into an aluminum thermal analysis crucible, and the aluminum thermal analysis crucible is placed into the sample placement table 461 of the automatic sample feeding device 460, so that metal solid powder is placed on the sample placement table 461 during the experimental preparation stage, and each experimental component is installed in place, and the air tightness of the device is checked;

[0052] S2, setting of experimental parameters. After all experimental components are connected, remove the top cover 454, open the gas cylinder 100 to purge the inside of the quartz tube 420 for three to five minutes. After the purge is completed, install the top cover 454, open the visual tube furnace 400 according to the set temperature program to heat the furnace body, set the center temperature of the furnace to 600°C, and then pass cooling water into the cooling channel 459 to ensure the stability of the sample in the area to be tested. Then open the gas cylinder 100, set the atmosphere flow rate, and slowly pass gas into the quartz tube 420 according to the set pressure condition, wait for the internal temperature and pressure of the visual tube furnace 400 to reach the conditions required for the experiment, and wait for the gas pressure in the quartz tube 420 to reach 0.5MPa. It can be considered that the experimental atmosphere conditions have been met, and close the gas cylinder 100 to wait for further experiments.

[0053] S3, experimental data collection, through the control unit 600 remote control of the motor 470, to achieve the automatic sample delivery device 460 to deliver the sample to the desired position, through the camera 500 to collect image data of the solid powder ignition and combustion process, the camera 500 through the control unit 600 built-in program and the automatic sample delivery device 460 jointly start, the ignition and combustion process at a shooting frame rate of 5000FPS / s full video;

[0054] S4, pressure relief and exhaust. Under the experimental state, if the pressure in the quartz tube 420 is greater than the triggering pressure of the bursting disc 455, the bursting disc 455 will burst at the specified pressure to release the pressure in the tube. If the bursting disc 455 is not triggered, the top cover 454 is manually opened to exhaust and relieve pressure, replace the sample or experimental atmosphere, and repeat the above steps S1-S4.

[0055] When studying the combustion experiment of solid powder under different atmospheres and different pressures, repeat step S4 and re-introduce another atmosphere into the quartz tube 420 to continue the experiment. The visual experimental device using the above structure also has rich expansion functions. For example, repeated continuous experiments, the aluminum thermite analysis crucible is taken out and replaced with a new aluminum thermite analysis crucible for experiments, so as to study the repeated continuous combustion process.

[0056] The above-mentioned ideal embodiments of the present invention are for inspiration. Through the above-mentioned description, relevant staff can make various changes and modifications without departing from the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An automatic experimental device for high-pressure combustion of solid powder, characterized in that: The invention comprises a gas storage bottle (100) for storing required pressure gas, a visualization tube furnace (400), a camera (500), a control unit (600) and a quartz tube (420), wherein one end of the quartz tube (420) is provided with a reducing nozzle nozzle (410), the reducing nozzle nozzle (410) is communicated with the output end of the gas storage bottle (100), a one-way valve (300) is provided between the reducing nozzle nozzle (410) and the gas storage bottle (100), the other end of the quartz tube (420) passes through the visualization tube furnace (400), and the other end of the quartz tube (420) is provided with a one-way pressure relief device (300). The apparatus (450) and the automatic sample delivery device (460) are used to deliver the sample to the quartz tube (420) located at the center of the visualization tube furnace (400) for conducting an experiment. The one-way pressure relief device (450) is located between the visualization tube furnace (400) and the automatic sample delivery device (460). The one-way pressure relief device (450) is used to relieve pressure in the quartz tube (420). The camera (500) is used to face the visualization tube furnace (400). The camera (500) and the automatic sample delivery device (460) are both connected to the control unit (600) by signals. The one-way pressure relief device (450) comprises a pressure relief cylinder body, the pressure relief cylinder body having a main channel and a pressure relief channel connected to the main channel, one end of the main channel being connected to the other end of the quartz tube (420), and the other end of the main channel being connected to the automatic sample feeding device (460), a bursting disc (455) being arranged at the outlet end of the pressure relief channel, a first buffer pressure relief mechanism, a second buffer pressure relief mechanism and a third buffer pressure relief mechanism being arranged in sequence from one end of the pressure relief channel to the bursting disc (455), the first buffer pressure relief mechanism being used to buffer and absorb the impact force entering the pressure relief channel, the second buffer pressure relief mechanism being used to buffer and absorb the impact force of the first buffer pressure relief mechanism, and the third buffer pressure relief mechanism being used to buffer and absorb the impact force of the second buffer pressure relief mechanism.

2. The automatic experimental device for high-pressure combustion of solid powder according to claim 1, characterized in that: The pressure relief cylinder comprises a lower cylinder body (451), an upper cylinder body (453) and a top cover (454) which are fixedly connected in sequence; the main flow channel is arranged on the lower cylinder body (451); a first channel is arranged on the lower cylinder body (451); a second channel is arranged on the upper cylinder body (453); the top cover (454) is an annular structure; the bursting disc (455) is fixed on the upper cylinder body (453) through the top cover (454); and a pressure relief channel is formed between the first channel and the second channel.

3. The automatic experimental device for high-pressure combustion of solid powder according to claim 2, characterized in that: The first pressure relief mechanism comprises a valve stem (456), a valve core (458) and a spring (457); one end of the valve stem (456) is fixedly connected to the upper cylinder body (453); one end of the valve core (458) is disposed against an end of the pressure relief channel close to the main flow channel; the valve core (458) is used to block the pressure relief channel and the main flow channel; one end of the spring (457) is disposed on the valve stem (456); and the other end of the spring (457) is disposed on the valve core (458).

4. The automatic experimental device for high-pressure combustion of solid powder according to claim 3, characterized in that: The second buffer pressure relief mechanism comprises a first pressure relief plate (4521), the first pressure relief plate (4521) is fixed between the upper cylinder body (453) and the lower cylinder body (451), a first pressure relief hole is provided on the first pressure relief plate (4521), the first pressure relief plate (4521) separates the upper cylinder body (453) and the lower cylinder body (451) from each other, and the first pressure relief hole connects the first flow channel with the second flow channel.

5. The automatic experimental device for high-pressure combustion of solid powder according to claim 4, characterized in that: The third buffer pressure relief mechanism comprises a second pressure relief plate (4522), the second pressure relief plate (4522) is fixed between the upper cylinder body (453) and the top cover (454), a second pressure relief hole is provided on the second pressure relief plate (4522), the second pressure relief plate (4522) separates the upper cylinder body (453) and the top plate from each other, and the first pressure relief hole connects the second flow channel and the bursting disc (455).

6. An automatic experimental device for high-pressure combustion of solid powder according to any one of claims 1 to 5, characterized in that: The pressure relief cylinder is provided with a cooling channel (459), and the cooling channel (459) is used to cool the sample in the main channel and ensure that the characteristics of the sample will not change.

7. The automatic experimental device for high-pressure combustion of solid powder according to claim 6, characterized in that: The cooling channel (459) is arranged around the main channel and is spirally shaped. One end of the cooling channel (459) is an input port, and one end of the cooling channel (459) is an output port.

8. The automatic experimental device for high-pressure combustion of solid powder according to claim 1, characterized in that: The automatic sample delivery device (460) comprises a housing (462) and a sample placement table (461) for placing samples, the housing (462) is fixedly mounted on the one-way pressure relief device (450), and a conveying mechanism for moving the sample placement table (461) to a desired position is provided on the housing (462).

9. The automatic experimental device for high-pressure combustion of solid powder according to claim 8, characterized in that: The conveying mechanism comprises a screw (465) and a motor (470). The motor (470) is fixedly mounted on a housing (462). The housing (462) is provided with a through hole matching the screw (465). The sample placement platform (461) is arranged on the screw (465). The screw (465) is arranged opposite to the quartz tube (420). One end of the screw (465) is arranged in the through hole. A large gear (463) is arranged on the output end of the motor (470). A rotatable small gear (464) is installed in the housing (462). The small gear (464) is threadedly connected to the screw (465). The large gear (463) and the small gear (464) are meshed with each other. A limiting groove is provided on the screw (465) along its axial direction. A limiting block matching the limiting groove is provided on the housing (462). The limiting block is arranged in the limiting groove.

10. An automatic experimental device and experimental method for high-pressure combustion of solid powder according to any one of claims 1 to 9, characterized in that: The specific steps are as follows: S1. Sample arrangement: During the experimental preparation stage, metal solid powder is placed on the sample placement table (461), and each experimental component is installed in place, and the air tightness of the device is checked; S2, setting the experimental parameters. After all experimental components are connected, remove the top cover (454), open the gas storage bottle (100) and purge the inside of the quartz tube (420) for three to five minutes. After the purge is completed, install the top cover (454), open the visual tube furnace (400) according to the set temperature program to heat the furnace body, and then pass cooling water into the cooling channel (459) to ensure the stability of the sample in the test area. Then open the gas storage bottle (100) and slowly pass gas into the quartz tube (420) according to the set pressure condition. After waiting for the temperature and pressure inside the visual tube furnace (400) to reach the conditions required for the experiment, close the gas storage bottle (100) and wait for further experiments. S3, experimental data collection, by remotely controlling the motor (470) through the control unit (600), so that the automatic sample delivery device (460) delivers the sample to the desired position, and collecting image data of the solid powder ignition and combustion process through the camera (500), the camera (500) is jointly started by the automatic sample delivery device (460) through the built-in program of the control unit (600), and the ignition and combustion process is recorded in full at a shooting frame rate of 5000FPS / s; S4, pressure relief and exhaust. Under the experimental state, if the pressure in the quartz tube (420) is greater than the triggering pressure of the bursting disc (455), the bursting disc (455) will burst at a specified pressure to release the pressure in the tube. If the bursting disc (455) is not triggered, the top cover (454) is manually opened to exhaust and relieve pressure, and the sample or experimental atmosphere is replaced, and the above steps S1-S4 are repeated.

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