An explosive ignition pressure threshold measuring device based on a gunpowder combustion loading mode

Abstract

The application provides an explosive ignition pressure threshold measuring device based on a gunpowder combustion loading mode, which comprises a bottom cylinder and an end cover detachably connected with the bottom cylinder, a limiting boss is formed along the radial direction outside the connection part of the bottom cylinder and the end cover, a positioning fixture is arranged outside the limiting boss, a clamping groove matched with the limiting boss is formed on the inner wall of the positioning fixture in the circumferential direction; a constraint ring is arranged outside the positioning fixture; a blind hole for placing an explosive column is formed in the bottom cylinder along the axial direction; a pressure sensor mounting hole and a self-adaptive pressure adjusting hole are formed through the end cover; an ignition head is arranged in the self-adaptive pressure adjusting hole, and the ignition head is connected with gunpowder arranged above the explosive column; the self-adaptive pressure adjusting hole comprises multiple stepped holes which are coaxially and continuously arranged and whose diameters gradually increase from bottom to top. The device separates the axial and radial constraints, is convenient to disassemble to obtain explosive debris after the test, and avoids the rapid escape of the gunpowder combustion products in the initial measurement stage and the rapid explosion of the explosive in the later measurement stage.

Description

Technical Field

[0001] This invention belongs to the field of explosive stability measurement technology, and relates to an explosive ignition pressure threshold measuring device based on the explosive combustion loading method. Background Technology

[0002] When penetrating munitions impact a target at high speed, the explosives inside are subjected to high impact loads, making them highly susceptible to ignition. This can lead to premature detonation of the munition or warhead, resulting in loss of combat capability. Therefore, when selecting explosives and designing the charge structure for penetrating munitions, it is crucial to focus on the pressure load threshold (ignition pressure threshold) at which the explosive ignites under impact. This pressure threshold is also a key basis for the design of overload-resistant explosive formulations for penetrating munitions.

[0003] Currently, the commonly used method for measuring the ignition pressure threshold of explosives is to fill the explosives into a metal shell with high strength, so that the explosives are under strong confining pressure. Then, impact loads are applied to the explosives through projectile impact, explosion / combustion loading, etc., and combined with macroscopic phenomena such as deformation or damage of the shell, it is determined whether the explosives have "exploded". Then, the magnitude of the impact load is adjusted according to the test results, and finally the pressure threshold that causes the explosives to ignite is determined. However, since the overload-resistant explosives used in penetrating munitions are relatively insensitive, as the impact load increases, the state of the explosive does not jump directly from "stable" to "explosive," but includes multiple reaction states: "stable → local slow reaction → local fast reaction → explosion." In the process of "local slow / fast reaction" of the explosive, the energy release rate is slow, and the shell may not undergo significant deformation or damage. Therefore, the method of judging whether the explosive has reacted based on macroscopic phenomena such as shell deformation or damage is difficult to accurately obtain the ignition pressure threshold of the explosive. It is necessary to measure the pressure change process of the internal cavity of the shell in the experiment to determine whether the explosive has reacted, and combine the explosive charge residue to measure the actual amount of explosive that has reacted.

[0004] The main methods for conducting explosive impact ignition tests include gas gun-loaded projectile impact tests, explosive loading tests, and gunpowder combustion loading tests. In the commonly used gunpowder combustion loading test, the explosive charge is confined within a cylindrical shell, with the upper end serving as the combustion chamber. Due to the high connection strength between the external threads of the shell and the internal threads of the end cap, and the small diameter of the ignition head's lead hole, the combustion products of the gunpowder do not easily leak out rapidly during the test, thus generating a high transient impact load on the explosive charge. However, this type of device has the following shortcomings, making it unable to accurately measure the explosive's impact ignition threshold: when the load generated by gunpowder combustion is large, the connecting threads deform, making it difficult to disassemble the shell and end cap, preventing the acquisition of explosive charge debris, and lacking sufficient basis for judging the local fast / slow reaction state; when the explosive begins to react, the gaseous products depressurize slowly and cannot adaptively adjust, causing the pressure inside the shell to rise rapidly and instantly explode, damaging the pressure sensor and making it impossible to obtain the pressure change curve of the entire reaction process. These shortcomings urgently require improvement. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide an explosive ignition pressure threshold measuring device based on the gunpowder combustion loading method, thereby solving the technical problem that existing explosive impact ignition test gunpowder combustion loading measuring devices cannot accurately determine the explosive reaction state and reliably obtain the entire process pressure curve to accurately measure the explosive ignition pressure threshold.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A device for measuring the ignition pressure threshold of explosives based on the gunpowder combustion loading method includes a bottom cylinder and an end cap detachably connected to the bottom cylinder. A limiting boss is formed radially outward at the connection between the bottom cylinder and the end cap. A positioning fixture is fitted over the limiting boss. A slot matching the limiting boss is formed on the inner wall of the positioning fixture along the circumferential direction. A constraint ring is fitted over the positioning fixture.

[0008] The bottom cylinder has a blind hole along the axial direction for placing the explosive charge; the end cap has a pressure sensor mounting hole and an adaptive pressure adjustment hole through it, and a pressure sensor is installed in the pressure sensor mounting hole; an ignition head is inserted in the adaptive pressure adjustment hole, and the ignition head is connected to the gunpowder above the explosive charge; the adaptive pressure adjustment hole includes a plurality of stepped holes coaxially connected from bottom to top, and the diameter of the plurality of stepped holes gradually increases from bottom to top.

[0009] The present invention also has the following technical features:

[0010] Specifically, the upper end of the bottom cylinder is provided with a first annular boss protruding radially, and the lower end of the end cap is provided with a second annular boss protruding radially. The first annular boss and the second annular boss are engaged to form the limiting boss.

[0011] Furthermore, the adaptive pressure regulating orifice includes a first stepped orifice, a second stepped orifice, and a third stepped orifice that are coaxially connected from bottom to top. The inner diameter of the first stepped orifice is smaller than the inner diameter of the second stepped orifice, and the inner diameter of the second stepped orifice is smaller than the inner diameter of the third stepped orifice.

[0012] Furthermore, the height of the blind hole is 1.75 to 2.25 times the diameter of the blind hole.

[0013] Furthermore, the distance between the bottom surface of the blind hole and the lower end surface of the bottom cylinder is 0.5 to 1.0 times the diameter of the blind hole.

[0014] Furthermore, the diameter of the bottom cylinder is 2 to 3 times the diameter of the blind hole; the radial distance between the outer edge of the first annular boss and the outer wall of the bottom cylinder is 0.3 to 0.6 times the diameter of the blind hole; and the axial height of the first annular boss is 0.4 to 0.7 times the diameter of the blind hole.

[0015] Furthermore, a plug-in portion is formed at the center of the lower end face of the end cap, which can be plugged into the blind hole.

[0016] Furthermore, the radial distance between the outer edge of the second annular boss and the outer wall of the end cap is 0.3 to 0.6 times the diameter of the blind hole; the axial height of the second annular boss is 0.4 to 0.7 times the diameter of the blind hole; and the axial height of the insertion part is 0.25 to 0.5 times the diameter of the blind hole.

[0017] Furthermore, the depths of the first, second, and third stepped holes are all 0.2 to 0.6 times the diameter of the blind hole.

[0018] Furthermore, the positioning fixture is formed by the joining of two semicircular rings.

[0019] Compared with the prior art, the beneficial technical effects of this invention are:

[0020] (1) The device of the present invention is configured with an adaptive pressure regulating hole consisting of multiple stepped holes with progressively larger diameters from bottom to top. This prevents the combustion products from rapidly escaping from the hole during the combustion stage of the gunpowder. It facilitates the generation of impact loads on the order of hundreds of megapascals in the blind hole. When the explosive reacts to the impact and the gas pressure inside the device increases rapidly, the gas release rate can be increased by means of the adaptive pressure regulating hole. This prevents the explosive from rapidly turning into an explosion during slow / fast reactions and destroying the entire measuring device. It also facilitates the sensor to obtain a complete pressure change curve.

[0021] (2) This device uses a positioning clamp to form an axial constraint on the end cap and the bottom cylinder, and a constraint ring to form a circumferential constraint on the positioning clamp, thereby separating the axial constraint structure and the circumferential constraint structure to avoid mutual constraint, making it easy to disassemble and remove the explosive residue after the test, and providing a scientific basis for the accurate judgment of the explosive reaction state. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention;

[0023] Figure 2 This is a schematic diagram of the end cap structure of the measuring device;

[0024] Figure 3 This is the pressure curve inside the measuring device obtained in Example 1;

[0025] Figure 4 It is the explosive residue recovered in Example 1.

[0026] The meanings of the labels in the diagram are as follows:

[0027] 1-Bottom cylinder, 2-End cap, 3-Explosive charge, 4-Positioning clamp, 5-Constraint ring, 6-Pressure sensor, 7-Ignition head, 8-Gunpowder; 11-Blind hole, 12-First annular boss; 21-Pressure sensor mounting hole, 22-Adaptive pressure adjustment hole, 23-Second annular boss, 24-Plug-in part; 221-First stepped hole, 222-Second stepped hole, 223-Third stepped hole.

[0028] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0029] The purpose of this invention is to provide an explosive ignition pressure threshold measuring device based on the gunpowder combustion loading method. This device can solve the technical problem that existing devices cannot accurately determine the explosive reaction state and reliably obtain the pressure curve of the whole process, thereby accurately measuring the explosive impact ignition pressure threshold and providing necessary technical support for the research and development of new anti-overload explosives and the selection of charge for penetrating munitions.

[0030] It should be noted that, unless otherwise specified, all components in this invention are components known in the prior art.

[0031] The power supply used in this invention is the FD200DA capacitor detonator produced by Shaanxi Weinan Sicheng Electronics Co., Ltd., which has a maximum discharge peak voltage of 2400V.

[0032] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0033] Example 1

[0034] Following the above technical solutions, such as Figure 1 and Figure 2 As shown in the figure, this embodiment provides a device for measuring the ignition pressure threshold of explosives based on the gunpowder combustion loading method. The explosive charge is composed of octogen (HMX)-based aluminum explosive with a diameter of 30 mm and an aspect ratio of 1:1. The ignition charge is an azide ammonium nitrate spherical flat propellant with a charge amount of 3 g.

[0035] The measuring device includes a base cylinder 1, which is a cylindrical structure with an outer diameter of 80 mm; and an end cap 2 detachably connected to the base cylinder 1. The connection between the base cylinder 1 and the end cap 2 forms a limiting boss that protrudes radially outward. A positioning clamp 4 is fitted over the limiting boss. A groove matching the limiting boss is formed on the inner wall of the positioning clamp 4 along the circumferential direction. The groove has a rectangular longitudinal section, and its axial height is equal to the sum of the axial heights of the first annular boss 12 and the second annular boss 23, ensuring that the positioning clamp 4 can completely and tightly wrap the limiting boss, and the end cap 2 and the base cylinder 1 are tightly connected. A constraint ring 5 is fitted over the positioning clamp 4. The inner diameter of the constraint ring 5 is the same as the outer diameter of the positioning clamp 4, and it can be fitted over the positioning clamp 4 to form a circumferential constraint on the positioning clamp 2, making it tightly fixed.

[0036] To facilitate installation and disassembly, the ratio of the axial height to the radial thickness of the constraint ring 5 is 1 to 1.5:1. In this embodiment, three constraint rings 5 ​​are fitted around the positioning clamp 4 from top to bottom. The ratio of the axial height to the radial thickness of each constraint ring 5 is 1:1, that is, the axial height and radial thickness of each constraint ring 5 are both 20mm.

[0037] Preferably, the constraint ring 5, positioning clamp 4, end cap 2 and bottom cylinder 1 can all be made of high-strength metal materials (such as steel and aluminum alloy). In this embodiment, they are made of 45# steel.

[0038] The bottom cylinder 1 has a cylindrical blind hole 11 for placing the explosive charge 3 along the axial direction; the end cap 2 has a pressure sensor mounting hole 21 and an adaptive pressure adjustment hole 22 through it; a pressure sensor 6 is installed in the pressure sensor mounting hole 21; an ignition head 7 is installed in the adaptive pressure adjustment hole 22 and is connected to the gunpowder 8 located above the explosive charge 3; the adaptive pressure adjustment hole 22 includes multiple stepped holes that are coaxially connected from bottom to top, and the diameter of the multiple stepped holes gradually increases from bottom to top.

[0039] The axis of the adaptive pressure adjustment hole 22 is parallel to the axis of the end cover 2; the pressure sensor mounting hole 21 is a through hole with internal thread, the diameter of which is the same as the diameter of the pressure sensor 6, and the sensing surface of the pressure sensor 6 is coplanar with the bottom surface of the end cover 2.

[0040] As a preferred embodiment, the upper end of the bottom cylinder 1 is provided with a first annular boss 12 protruding radially, and the lower end of the end cap 2 is provided with a second annular boss 23 protruding radially. The first annular boss 12 and the second annular boss 23 are engaged to form a limiting boss.

[0041] As a preferred embodiment, the adaptive pressure regulating hole 22 includes a first stepped hole 221, a second stepped hole 222 and a third stepped hole 223 that are coaxially connected from bottom to top. The inner diameter of the first stepped hole 221 is smaller than the inner diameter of the second stepped hole 222, and the inner diameter of the second stepped hole 222 is smaller than the inner diameter of the third stepped hole 223.

[0042] As a preferred embodiment, the height of the blind hole 11 is 1.75 to 2.25 times the diameter of the blind hole 11.

[0043] In this embodiment, the diameter of the blind hole is 30mm and the height of the blind hole is 60mm.

[0044] As a preferred embodiment, the distance between the bottom surface of the blind hole 11 and the lower end surface of the bottom cylinder 1 is 0.5 to 1.0 times the diameter of the blind hole 11.

[0045] In this embodiment, the distance between the bottom surface of the blind hole 11 and the lower end surface of the bottom cylinder 1 is 20mm.

[0046] As a preferred embodiment, the diameter of the bottom cylinder 1 is 2 to 3 times the diameter of the blind hole 11; the distance between the outer edge of the first annular boss 12 and the outer wall of the bottom cylinder 1 is 0.3 to 0.6 times the diameter of the blind hole 11; and the axial height of the first annular boss 12 is 0.4 to 0.7 times the diameter of the blind hole 11.

[0047] In this embodiment, the diameter of the bottom cylinder 1 is 80mm, the distance between the outer edge of the first annular boss 12 and the outer wall of the bottom cylinder 1 is 15mm, and the axial height of the first annular boss 12 is 15mm.

[0048] As a preferred embodiment, the lower end face of the end cap 2 protrudes outward to form a plug-in portion 24, which can be plugged into the blind hole 11.

[0049] In this embodiment, the thickness of the end cap 2 is 25mm.

[0050] As a preferred embodiment, the radial distance between the outer edge of the second annular boss 23 and the outer wall of the end cap 2 is 0.3 to 0.6 times the diameter of the blind hole 11; the axial height of the second annular boss 23 is 0.4 to 0.7 times the diameter of the blind hole 11; and the axial height of the insertion part is 0.25 to 0.5 times the diameter of the blind hole 11.

[0051] In this embodiment, the radial distance between the outer edge of the second annular boss 23 and the outer wall of the end cap 2 is 15mm, the axial height of the second annular boss 23 is 15mm, and the axial height of the insertion part 24 is 10mm.

[0052] As a preferred embodiment, the depths of the first stepped hole 221, the second stepped hole 222, and the third stepped hole 223 are all 0.2 to 0.6 times the diameter of the blind hole 11.

[0053] In this embodiment, the dimensions of the first stepped hole 221 are Φ3×10mm, the dimensions of the second stepped hole 222 are Φ6×12mm, and the dimensions of the third stepped hole 223 are Φ12×13mm.

[0054] As a preferred embodiment, the positioning clamp 4 is formed by connecting two semi-circular rings.

[0055] During installation, the device of this invention is as follows: the explosive charge 3 is installed in the blind hole 11. A gunpowder package consisting of gunpowder 8 and an ignition head 7 is placed in the cavity above the explosive charge 3 in the blind hole 11. The lead wire of the ignition head 7 passes through the adaptive pressure adjustment hole 22 of the end cap 2 and is connected to an external power supply. The pressure sensor 6 is installed in the pressure sensor mounting hole 21 and connected to a remote server. The positioning clamp 4 and the constraint ring 5 are installed to complete the assembly of the testing device. The semi-circular positioning clamp 4 provides axial constraint to the end cap 2 and the bottom cylinder 1, while the constraint ring 5 provides circumferential constraint to the positioning clamp 4. This separates the axial and circumferential constraint structures, preventing them from mutually restricting each other. This ensures that the entire measuring device will not experience phenomena such as thread "locking" under large internal impact loads, facilitating disassembly after testing and removal of explosive residues. This provides a direct basis for accurately determining the reaction state of the explosive under impact loads.

[0056] The use of the measuring device includes two stages: the first stage is the action stage of the gunpowder combustion products, and the second stage is the action stage after the explosive reaction.

[0057] In the first stage, the ignition head 7 is ignited by an external power source, causing the gunpowder 8 to burn rapidly. The first stepped hole 221 in the adaptive pressure regulating hole 22 can prevent the combustion products of the gunpowder 8 from escaping rapidly from the hole. At the same time, the insertion part 24 of the end cap 2 extends into the blind hole 11, so that there is a right angle between the interface gap between the end cap 2 and the bottom cylinder 1, which greatly reduces the speed at which the combustion products of the gunpowder 8 escape from this area. This structural design can greatly improve the ability of the blind hole 11 to constrain the combustion products of the gunpowder 8, thereby generating an impact load on the order of hundreds of megapascals.

[0058] In the second stage, the explosive charge 3 is impacted and begins to react, rapidly producing gaseous products. The adaptive pressure regulating hole 22 of the end cap 2 serves as the sole venting channel for these gaseous products. Its venting rate depends on the smallest diameter first step hole 221. If the explosive undergoes a localized, low-speed reaction, the gaseous products are fewer and produced at a slower rate, allowing for rapid venting through the first step hole 221 to prevent further increase in gas pressure in the blind hole 11. Conversely, if the explosive undergoes a faster reaction, the gaseous products increase rapidly, and the venting rate of the first step hole 221 cannot be further increased, leading to a rapid increase in gas pressure in the blind hole 11. This gas pressure will then cause the diameter of the first step hole 221 to gradually expand until it reaches the diameter of the second step hole 221. If the pressure in the middle of the orifice 22 no longer continues to increase, the orifice expansion process will stop immediately. This change in orifice diameter can significantly increase the venting capacity of the adaptive pressure regulating orifice 22. If the orifice diameter of the second step orifice 222 still cannot meet the venting requirements of the explosive gas products, the gas pressure in the blind orifice 11 will continue to increase, and the orifice diameters of the first step orifice 221 and the second step orifice 222 will continue to expand together until they reach the orifice diameter of the third step orifice 223. At this time, the venting capacity of the adaptive pressure regulating orifice 22 is greatly improved, which can prevent the gas pressure in the blind orifice 11 from increasing further, making it difficult for the explosive charge 3 to quickly turn into an explosion, thereby preventing the entire measuring device from being destroyed instantly, and making it easier for the pressure sensor 21 to obtain a complete pressure change curve.

[0059] In this embodiment, tests were conducted under three working conditions with gunpowder 8 weighing 2.0g, 3.0g, and 3.5g.

[0060] Depend on Figure 3 The pressure curves show that under the three operating conditions, the pressure rise period during the combustion loading stage of gunpowder 8 is similar, and the peak impact pressure increases with the increase of the mass of gunpowder 5. However, the reaction characteristics after the explosive charge 3 is activated will change the process of the gas pressure decrease in the blind hole 11. When the mass of gunpowder 8 is 2.0g, the peak impact pressure formed by the combustion of gunpowder 8 is about 150MPa, and the subsequent pressure curve shows a smooth downward trend. Figure 4It can be seen that the explosive charge 3 is intact and has not undergone any reaction. The downward curve is caused by the natural release of the combustion products of the explosive 5 through the adaptive pressure regulating hole 22 of the end cap 2, which is a natural pressure relief process. When the mass of the explosive 8 is 3.0g, the peak impact pressure formed by the combustion of the explosive 8 is about 250MPa. The pressure curve then naturally decreases to around 150MPa, and its rate of decrease suddenly reaches an inflection point. By comparing with the working condition of 2.0g, it can be found that the rate of pressure decrease at this time is significantly slower. Figure 4 It can be observed that after the explosive charge 3 is ignited, a localized slow reaction occurs, and the diameters of the three stepped holes in the adaptive pressure regulating orifice 22 do not increase. When the mass of gunpowder 8 is 3.5g, the peak impact pressure generated by the combustion of gunpowder 8 is approximately 300MPa. The subsequent pressure curve naturally decreases to around 200MPa, then suddenly turns and rises rapidly, indicating that the explosive charge 3 undergoes a violent ignition reaction. When the pressure reaches 350MPa, the diameters of the first stepped hole 221 and the second stepped hole 222 of the adaptive pressure regulating orifice 22 both increase to Φ12mm, which significantly accelerates the release rate of gaseous products in the blind hole 11, further causing the gas pressure to gradually decrease, ultimately stopping the reaction of the explosive charge 3. Figure 4 As shown, at this point, some debris remains of the explosive charge. Based on the tests under the above three operating conditions, it was found that the impact pressure threshold for the slow reaction of this HMX-based aluminum explosive is in the range of 150–250 MPa, and the pressure threshold for the rapid ignition reaction is in the range of 250–300 MPa.

[0061] By further adjusting the quality of the explosive within this range, experiments were conducted, and the impact pressure threshold for the slow reaction of the HMX-based aluminum explosive was finally determined to be 190 MPa, and the pressure threshold for the rapid ignition reaction was determined to be 285 MPa.

[0062] The above test results fully demonstrate that the measuring device in this embodiment is simple to assemble, highly efficient, and has a wide range of adjustable impact pressure loads, making it widely applicable to the measurement of impact ignition pressure thresholds for different types of explosives. Even after undergoing internal impact loads of hundreds of megapascals, the device can still be safely and conveniently disassembled without causing secondary damage to the explosive residue, ensuring the scientific accuracy of the assessment of explosive reaction characteristics. When the explosive undergoes a rapid reaction, the device automatically and quickly increases the gas release rate through an adaptive pressure adjustment orifice, preventing the explosive from rapidly detonating and destroying the entire measuring device. This ensures that the pressure sensor acquires a complete pressure change curve, improving the accuracy and reliability of the test measurements. Therefore, it provides reliable technical support for accurately obtaining the reaction process and ignition pressure threshold of explosives.

[0063] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0064] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0065] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A device for measuring the ignition pressure threshold of explosives based on the gunpowder combustion loading method, comprising a bottom cylinder (1) and an end cap (2) detachably connected to the bottom cylinder (1), wherein a limiting boss is formed radially outward at the connection between the bottom cylinder (1) and the end cap (2), and a positioning fixture (4) is fitted over the limiting boss, wherein a slot matching the limiting boss is provided on the inner wall of the positioning fixture (4) in the circumferential direction; and a constraint ring (5) is fitted over the positioning fixture (4). The bottom cylinder (1) has a blind hole (11) for placing the explosive charge (3) along the axial direction; the end cap (2) has a pressure sensor mounting hole (21) and an adaptive pressure adjustment hole (22) through it; a pressure sensor (6) is installed in the pressure sensor mounting hole (21); an ignition head (7) is installed in the adaptive pressure adjustment hole (22), and the ignition head (7) is connected to the gunpowder (8) above the explosive charge (3); the adaptive pressure adjustment hole (22) includes a plurality of stepped holes coaxially connected from bottom to top, and the diameter of the plurality of stepped holes gradually increases from bottom to top.

2. The explosive ignition pressure threshold measuring device based on gunpowder combustion loading method as described in claim 1, characterized in that, The bottom cylinder (1) has a first annular boss (12) protruding radially at its upper end, and the end cap (2) has a second annular boss (23) protruding radially at its lower end. The first annular boss (12) and the second annular boss (23) are engaged to form the limiting boss.

3. The explosive ignition pressure threshold measuring device based on gunpowder combustion loading method as described in claim 1, characterized in that, The adaptive pressure regulating hole (22) includes a first stepped hole (221), a second stepped hole (222) and a third stepped hole (223) that are coaxially connected from bottom to top. The inner diameter of the first stepped hole (221) is smaller than the inner diameter of the second stepped hole (222), and the inner diameter of the second stepped hole (222) is smaller than the inner diameter of the third stepped hole (223).

4. The explosive ignition pressure threshold measuring device based on gunpowder combustion loading method as described in claim 1, characterized in that, The height of the blind hole (11) is 1.75 to 2.25 times the diameter of the blind hole (11).

5. The explosive ignition pressure threshold measuring device based on gunpowder combustion loading method as described in claim 1, characterized in that, The distance between the bottom surface of the blind hole (11) and the lower end surface of the bottom cylinder (1) is 0.5 to 1.0 times the diameter of the blind hole (11).

6. The explosive ignition pressure threshold measuring device based on gunpowder combustion loading method as described in claim 2, characterized in that, The diameter of the bottom cylinder (1) is 2 to 3 times the diameter of the blind hole (11); the distance between the outer edge of the first annular boss (12) and the outer wall of the bottom cylinder (1) is 0.3 to 0.6 times the diameter of the blind hole (11); the height of the first annular boss (12) is 0.4 to 0.7 times the diameter of the blind hole (11).

7. The explosive ignition pressure threshold measuring device based on gunpowder combustion loading method as described in claim 2, characterized in that, The end cap (2) has a protruding insertion part (24) at the center of its lower end face, which can be inserted into the blind hole (11).

8. The explosive ignition pressure threshold measuring device based on gunpowder combustion loading method as described in claim 7, characterized in that, The radial distance between the outer edge of the second annular boss (23) and the outer wall of the end cap (2) is 0.3 to 0.6 times the diameter of the blind hole (11); the axial height of the second annular boss (23) is 0.4 to 0.7 times the diameter of the blind hole (11); and the axial height of the plug is 0.25 to 0.5 times the diameter of the blind hole (11).

9. The explosive ignition pressure threshold measuring device based on gunpowder combustion loading method as described in claim 3, characterized in that, The depths of the first stepped hole (221), the second stepped hole (222), and the third stepped hole (223) are all 0.2 to 0.6 times the diameter of the blind hole (11).

10. The explosive ignition pressure threshold measuring device based on gunpowder combustion loading method as described in claim 1, characterized in that, The positioning fixture (4) is formed by connecting two semi-circular rings.

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