A device for measuring the ignition threshold of explosive charges under oblique impact

Abstract

The application provides a device for measuring ignition threshold of explosive charge under oblique impact, which comprises a sleeve arranged vertically, and a cavity with both ends open in the sleeve is a sleeve cavity. A fixed base and a wedge-shaped loading platform are sequentially arranged from bottom to top in the sleeve cavity, and a positioning groove is arranged on the inner wall of the sleeve cavity in the vertical direction. The fixed base comprises a base body, a base positioning strip is arranged on the outer side wall of one side of the base body, and the base positioning strip is assembled in the positioning groove; and a shell mounting blind hole with a central axis arranged obliquely is arranged on the upper end surface of the base body. The wedge-shaped loading platform comprises a loading platform body, an inclined surface is arranged on the lower end surface of the loading platform body, and a loading platform positioning strip is arranged on the outer side wall of the loading platform body, and the loading platform positioning strip is assembled in the positioning groove. A charge shell is coaxially arranged in the shell mounting blind hole, and an explosive charge is arranged in the charge shell. The device adjusts the inclination angle of the inner bottom surface of the shell mounting blind hole and the inclined surface, changes the impact angle of the explosive charge, and simulates the oblique penetration process under different angles.

Description

Technical Field

[0001] This invention belongs to the field of explosive performance testing technology, and relates to ignition threshold measurement, specifically to a device for measuring the ignition threshold of explosive charge under oblique impact. Background Technology

[0002] In actual combat environments, influenced by the target's position and condition, projectiles typically penetrate at an angle upon impact. During penetration, projectile attitude deflection and trajectory deviation can occur, with the degree of deflection becoming increasingly severe as the target's layers or depth increase. Simultaneously, the strong axial and lateral loads generated by localized contact between the projectile and target can easily cause structural failures such as projectile bending and fracture, severely impacting the stability of explosive charges. Currently, there is a lack of reliable experimental equipment for studying the stability of explosive charges during oblique penetration, hindering research on the penetration stability of explosive charges and affecting the optimized design of weapon and ammunition charges.

[0003] Current research on the oblique penetration process of projectiles mainly focuses on three aspects: first, studying the attitude deflection and trajectory deflection of the projectile during oblique penetration; second, studying the failure behavior of the projectile, such as fracture damage, during oblique penetration; and third, studying the response process of the target plate fracture and damage during oblique penetration. However, there is a lack of reliable experimental equipment and research methods to address the safety issues of fracture damage to the projectile during oblique penetration, which could lead to damage and ignition of the internal explosive charge. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a device for measuring the ignition threshold of explosive charges under oblique impact, thereby solving the technical problem that it is difficult to measure the ignition threshold of explosive charges during oblique penetration in existing technologies.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0006] A device for measuring the ignition threshold of explosive charge under oblique impact includes a measuring mechanism. The measuring mechanism includes a thick-walled cylindrical sleeve arranged vertically, and a cavity arranged coaxially inside the sleeve is called a sleeve cavity. Both vertical ends of the sleeve cavity are open.

[0007] The sleeve cavity is provided with a fixed base and a wedge-shaped loading platform arranged vertically from bottom to top. A positioning groove is also provided radially on one side of the inner wall of the sleeve cavity. The positioning groove is arranged vertically and is open at both ends.

[0008] The fixed base includes a cylindrical base body with an outer diameter equal to the inner diameter of the sleeve cavity. A protruding base positioning strip is integrally provided on one outer side wall of the base body. The base positioning strip is arranged vertically and fits snugly in the positioning groove. A cylindrical shell mounting blind hole is provided on the upper end surface of the base body. The central axis of the shell mounting blind hole forms an angle with the central axis of the base body.

[0009] The wedge-shaped loading platform includes a cylindrical loading platform body with a diameter equal to the inner diameter of the sleeve cavity. An inclined surface is provided on the lower end face of the loading platform body, which is parallel to the inner bottom surface of the blind hole for mounting the housing. The inclined surface does not contact the upper end face of the base body. A protruding loading platform positioning strip is also integrally provided at the shortest generatrix on the outer side wall of the loading platform body. The loading platform positioning strip is arranged vertically and fits snugly in the positioning groove.

[0010] The shell mounting blind hole also contains a charge shell coaxially mounted. The outer diameter of the charge shell is equal to the inner diameter of the shell mounting blind hole. The lower end face of the charge shell abuts against the inner bottom face of the shell mounting blind hole, and the upper end face of the charge shell abuts against the inclined surface. The charge shell also contains an explosive charge. By impacting the upper end face of the loading platform body, the ignition threshold of the explosive charge in the explosive charge under oblique impact is measured.

[0011] The present invention also has the following technical features.

[0012] Specifically, a cylindrical striking post is coaxially arranged inside the sleeve cavity. The striking post is coaxially arranged at the vertical bottom of the base body. The diameter of the striking post is equal to the inner diameter of the sleeve cavity. The upper end face of the striking post is in contact with the lower end face of the base body. The lower end face of the striking post also extends vertically to the bottom of the sleeve cavity.

[0013] The sleeve cavity is also coaxially provided with a cylindrical upper impact post, which is coaxially arranged at the top vertical position of the loading platform body. The diameter of the upper impact post is equal to the inner diameter of the sleeve cavity. The lower end face of the upper impact post is in contact with the upper end face of the loading platform body, and the upper end face of the upper impact post extends vertically to the top of the sleeve cavity.

[0014] Specifically, the upper striking post is also provided with a pressure-acting end cap at its vertical top. The pressure-acting end cap includes an end cap body with a circular cross-section. A blind hole in the bottom of the end cap is coaxially opened on the lower end face of the end cap body. The inner diameter of the blind hole at the bottom of the end cap is equal to the diameter of the upper striking post. The vertical top of the upper striking post is installed in the blind hole at the bottom of the end cap.

[0015] Specifically, the cross-section of the positioning groove is semi-circular; the angle between the central axis of the housing mounting blind hole and the central axis of the base body is 5° to 30°.

[0016] Specifically, the sleeve, fixed base, wedge-shaped loading platform, charge housing, lower striking post, upper striking post, and pressure-applying end cap are all made of metal.

[0017] Specifically, it also includes a testing mechanism, which, from bottom to top, includes a coaxially arranged and sequentially sealed installation chamber, a projectile movement chamber, and a high-pressure launch chamber.

[0018] The mounting chamber is coaxially provided with a mounting cavity. A lower impact post mounting platform and a protective cylinder are coaxially mounted in the mounting cavity from bottom to top along the vertical direction. The lower impact post mounting platform includes a mounting platform body. A lower impact post mounting blind hole is coaxially opened on the upper end surface of the mounting platform body. The inner diameter of the lower impact post mounting blind hole is equal to the diameter of the lower impact post. The vertical bottom of the lower impact post is installed into the lower impact post mounting blind hole, thereby achieving support for the measuring mechanism near the vertical bottom.

[0019] Specifically, the upper end face of the mounting platform body is also connected to the lower end face of the protective cylinder; the protective cylinder is a cylindrical structure with both vertical ends open, the inner diameter of the protective cylinder is larger than the outer diameter of the sleeve, and a positioning ring is coaxially installed inside the protective cylinder near the upper end face. The outer diameter of the positioning ring is equal to the inner diameter of the protective cylinder, and the inner diameter of the positioning ring is equal to the outer diameter of the sleeve. The sleeve is installed inside the positioning ring near the vertical top, thereby achieving support for the measuring mechanism near the vertical top.

[0020] The pressure-acting end cap is also located on the outer surface of the upper end face of the positioning ring.

[0021] Specifically, the projectile movement chamber is long and tubular in shape, and the cavity inside the projectile movement chamber is a movement cavity. A high-speed impact projectile is coaxially arranged inside the movement cavity. The high-speed impact projectile is coaxially arranged with the end cap body, and the cross-section of the high-speed impact projectile is larger than the cross-section of the end cap body.

[0022] The high-pressure launch chamber is equipped with high-pressure gas. The high-speed impact projectile moves vertically from top to bottom into the mounting cavity under the propulsion of the high-pressure gas and impacts the upper end face of the end cap body in the mounting cavity.

[0023] Compared with the prior art, the present invention has the following technical effects.

[0024] (I) The device in this invention can quantitatively set the angle at which the explosive charge is subjected to oblique impact; by adjusting the inclination angle of the inner bottom surface of the blind hole in the housing and the inclination angle of the wedge loading platform, the angle of the impact load on the explosive charge can be changed, thus simulating the oblique penetration process at different angles.

[0025] (II) The device in this invention can quantitatively adjust the magnitude of the impact load on the explosive charge; by adjusting the impact speed of the high-speed impact projectile or the thickness of the end cap body, the magnitude of the impact load on the explosive charge can be adjusted; the higher the impact speed, the greater the impact load; within a certain range, the thicker the end cap body, the greater the impact load.

[0026] (III) The device in this invention obtains the fracture state, damage pattern and ignition threshold of explosive charge under specified angle and impact load by projectile impact method, realizes the quantitative characterization and evaluation of the explosive charge's ability to resist complex load, and provides necessary technical support for the research and development of overload-resistant explosives and the selection of charge for penetrating munitions. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the measuring mechanism.

[0028] Figure 2 A schematic diagram of the structure in which the measuring mechanism is installed in the testing mechanism.

[0029] Figure 3(a) is a top view of the fixed base.

[0030] Figure 3(b) is a schematic diagram of the main structure of the fixed base.

[0031] Figure 4(a) is a top view of the wedge-shaped loading stage.

[0032] Figure 4(b) is a schematic diagram of the main structure of the wedge loading stage.

[0033] The labels in the diagram represent the following: 1-sleeve, 2-fixed base, 3-wedge loading platform, 4-charge casing, 5-explosive charge, 6-downward impact post, 7-upward impact post, 8-pressure end cap, 9-installation chamber, 10-projectile movement chamber, 11-high-pressure launch chamber, 12-installation cavity, 13-downward impact post installation platform, 14-protective cylinder, 15-positioning ring, 16-movement cavity, 17-high-speed impact projectile.

[0034] 101 - Sleeve cavity, 102 - Positioning groove.

[0035] 201-Base body, 202-Base positioning strip, 203-Blind hole for housing mounting.

[0036] 301 - Loading platform body, 302 - Inclined surface, 303 - Loading platform positioning bar.

[0037] 801 - End cap body, 802 - Blind hole at the bottom of the end cap.

[0038] 1301 - Mounting platform body, 1302 - Blind hole for mounting the lower strike post.

[0039] The specific content of the present invention will be further described in detail below with reference to the embodiments. Detailed Implementation

[0040] It should be noted that, unless otherwise specified, all components and materials in this invention are commonly used in the art in the prior art. For example, the installation chamber uses a known installation chamber, the protective cylinder uses a known protective cylinder, and the 2kg polyethylene shot uses a known 2kg polyethylene shot.

[0041] In this invention, the OXYZ coordinate system is a three-dimensional rectangular coordinate system, with the X-axis pointing horizontally to the right; the Y-axis pointing vertically to the rear; and the Z-axis pointing vertically upwards.

[0042] Following the above technical solution, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of the present invention fall within the protection scope of the present invention.

[0043] Example:

[0044] This embodiment provides a device for measuring the ignition threshold of explosive charges under oblique impact, such as... Figure 1 As shown, it includes a measuring mechanism, which includes a thick-walled cylindrical sleeve 1 arranged vertically, and a cylindrical cavity 101 arranged coaxially inside the sleeve 1. Both vertical ends of the sleeve cavity 101 are open.

[0045] A fixed base 2 and a wedge-shaped loading platform 3 are arranged vertically from bottom to top inside the sleeve cavity 101. A positioning groove 102 is also provided radially on one side of the inner wall of the sleeve cavity 101. The positioning groove 102 is arranged vertically and is open at both ends.

[0046] As shown in Figures 3(a) and 3(b), the fixed base 2 includes a cylindrical base body 201. The outer diameter of the base body 201 is equal to the inner diameter of the sleeve cavity 101. A protruding base positioning strip 202 is integrally provided on one side of the outer wall of the base body 201. The base positioning strip 202 is arranged vertically and fits into the positioning groove 102. A cylindrical shell mounting blind hole 203 is opened on the upper end surface of the base body 201. The central axis of the shell mounting blind hole 203 is arranged obliquely, and an angle is formed between the central axis of the shell mounting blind hole 203 and the central axis of the base body 201.

[0047] As shown in Figures 4(a) and 4(b), the wedge-shaped loading platform 3 includes a cylindrical loading platform body 301. The diameter of the loading platform body 301 is equal to the inner diameter of the sleeve cavity 101. An inclined surface 302 is provided on the lower end face of the loading platform body 301. The inclined surface 302 is parallel to the inner bottom surface of the housing mounting blind hole 203. The inclined surface 302 does not contact the upper end face of the base body 301. A protruding loading platform positioning strip 303 is also integrally provided at the shortest generatrix on the outer side wall of the loading platform body 301. The loading platform positioning strip 303 is arranged vertically and fits into the positioning groove 102.

[0048] A charge housing 4 is coaxially installed inside the blind hole 303 of the housing. The outer diameter of the charge housing 4 is equal to the inner diameter of the blind hole 203 of the housing. The lower end face of the charge housing 4 abuts against the inner bottom face of the blind hole 203 of the housing, and the upper end face of the charge housing 4 abuts against the inclined surface 302. An explosive charge 5 is also installed inside the charge housing 4. By impacting the upper end face of the loading platform body 301, the ignition threshold of the explosive charge in the explosive charge 5 under oblique impact is measured.

[0049] In this embodiment, the base body 201 is circumferentially positioned in the sleeve cavity 101 by fitting the base positioning strip 202 in the positioning groove 102; the loading platform body 301 is circumferentially positioned in the sleeve cavity 101 by fitting the loading platform positioning strip 303 in the positioning groove 102.

[0050] In this embodiment, the inner diameter of the sleeve cavity 101 is denoted as d. Based on the inner diameter d of the sleeve cavity 101, the outer diameter of the sleeve 1 is 2.0d to 4.0d, the axial height (vertical height) of the sleeve 1 is 2.0d to 6.0d, and the groove depth of the positioning groove 102 is 1.5mm to 2.5mm. In a further preferred embodiment, the inner diameter d of the sleeve cavity 101 is Φ40mm, the outer diameter is Φ88mm, and the height is 150mm; the groove depth of the positioning groove 102 is 2.0mm, and the groove width is 2.0mm.

[0051] In this embodiment, the base body 201 has a diameter of d and a height of 0.4d to 0.6d; the inner diameter of the housing mounting blind hole 203 is 0.2d to 0.5d, and the axial depth is 0.05d to 0.1d. In a further preferred embodiment, the base body 201 has a diameter of 40mm and a height of 20mm; the axial depth of the housing mounting blind hole 203 is 6.0mm.

[0052] In this embodiment, the diameter of the loading platform body 301 is d, and the vertical height at the shortest generatrix on the outer side of the wedge-shaped loading platform 3 is 0.2d to 0.4d; in a further preferred embodiment, the diameter of the loading platform body 301 is 40mm, and the vertical height at the shortest generatrix on the outer side of the wedge-shaped loading platform 3 is 10mm.

[0053] In this embodiment, the charge housing 4 is a thin cylindrical tube that is closed at one end axially and has a threaded end cap that can be opened or closed. The wall thickness of the charge housing 4 is 0.05d to 0.075d, and the axial height of the charge housing 4 is 0.5d to 1.0d. The outer diameter and height of the explosive charge 5 are consistent with the inner diameter and internal axial height of the charge housing 4, respectively. The charge housing 4 adopts a commonly used charge housing known in the art. In this embodiment, it is further preferred that the axial height of the charge housing 4 is 36mm, the wall thickness is 2.25mm, and the thickness of the threaded end cap is 3.75mm.

[0054] In this embodiment, the explosive charge 5 is a commonly known explosive charge in the art, and the explosive charge in the explosive charge 5 is an octogen HMX-based aluminum explosive commonly known in the art.

[0055] In this embodiment, the inclined surface 302 of the wedge loading platform 3 is parallel to the inner bottom surface of the housing mounting blind hole 203, that is, both are inclined and have the same inclination angle. This enables the explosive housing 4 to remain in an inclined state after being installed in the housing mounting blind hole 303, thereby realizing the oblique impact loading of the explosive charge 5 inside the explosive housing 4.

[0056] As a preferred embodiment of this invention, such as Figure 1 As shown, a cylindrical striking post 6 is also coaxially arranged inside the sleeve cavity 101. The striking post 6 is coaxially arranged at the vertical bottom of the base body 201. The diameter of the striking post 6 is equal to the inner diameter of the sleeve cavity 101. The upper end face of the striking post 6 is in contact with the lower end face of the base body 201. The lower end face of the striking post 6 also extends vertically to the bottom of the sleeve cavity 101.

[0057] A cylindrical upper striking post 7 is also coaxially arranged inside the sleeve cavity 101. The upper striking post 7 is coaxially arranged on the vertical top of the loading platform body 301. The diameter of the upper striking post 7 is equal to the inner diameter of the sleeve cavity 101. The lower end face of the upper striking post 7 is in contact with the upper end face of the loading platform body 301. The upper end face of the upper striking post 7 also extends vertically to the top of the sleeve cavity 101.

[0058] In this embodiment, the diameter of the downward striking post 6 is d, and the vertical height is 1.5d to 3.0d; in a further preferred embodiment, the diameter of the downward striking post 6 is 40mm, and the vertical height is 70mm.

[0059] In this embodiment, the diameter of the upper striking post 7 is d, and the vertical height is 1.5d to 3.0d; in a further preferred embodiment, the diameter of the upper striking post 7 is 40mm, and the vertical height is 70mm.

[0060] In this embodiment, to ensure proper assembly, the inner diameter tolerance of the sleeve cavity 101 is set to 0.02 to 0.05 mm, and the outer diameter tolerance of the lower striking post 6, the base body 201, the loading platform body 301, and the upper striking post 7 is set to -0.025 to -0.05 mm. The surface roughness Ra of the inner wall of the sleeve cavity 101, the outer wall of the lower striking post 6, the outer wall of the base body 201, the outer wall of the loading platform body 301, and the outer wall of the upper striking post 7 is 0.8.

[0061] As a preferred embodiment, the upper striking post 7 is also provided with a pressure-acting end cap 8 at its vertical top. The pressure-acting end cap 8 includes an end cap body 801 with a circular cross-section. A blind hole 802 in the shape of a blind hole at the bottom of the end cap is coaxially opened on the lower end surface of the end cap body 801. The inner diameter of the blind hole 802 at the bottom of the end cap is equal to the diameter of the upper striking post 7. The vertical top of the upper striking post 7 is installed in the blind hole 802 at the bottom of the end cap.

[0062] In this embodiment, the end cap body 801 is a cylindrical thin plate with an outer diameter of 2.0d to 2.8d and a thickness of 0.2d to 0.8d. The blind hole 802 at the bottom of the end cap has an inner diameter of d and a vertical depth of 0.1d to 0.2d. In a further preferred embodiment, the end cap body 801 has an outer diameter of 100mm and a thickness of 25mm; the blind hole 802 at the bottom of the end cap has an inner diameter of 40mm and a vertical depth of 5mm.

[0063] In this embodiment, the upper striking post 7 and the pressure-applying end cap 8 are bonded together.

[0064] In this embodiment, the pressure-acting end cap 8 is used to transmit impact loads.

[0065] As a preferred embodiment, the cross-section of the positioning groove 102 is semi-circular; the angle between the central axis of the housing mounting blind hole 203 and the central axis of the base body 201 is 5° to 30°.

[0066] In this embodiment, the angle between the central axis of the housing mounting blind hole 203 and the central axis of the base body 201 is 20°.

[0067] As a preferred embodiment, the sleeve 1, the fixed base 2, the wedge-shaped loading platform 3, the charge housing 4, the lower impact post 6, the upper impact post 7, and the pressure-acting end cap 8 are all made of metal.

[0068] In this embodiment, the metal material is a commonly known metal material in the art; more preferably, the metal material is T10A steel, which is commonly known in the art.

[0069] As a preferred embodiment of this invention, such as Figure 2 As shown, it also includes a test mechanism, which includes, from bottom to top, a coaxially arranged and sequentially sealed installation chamber 9, a projectile movement chamber 10, and a high-pressure launch chamber 11.

[0070] An installation cavity 12 is coaxially arranged inside the installation chamber 9. A lower impact post mounting platform 13 and a protective cylinder 14 are coaxially installed vertically from bottom to top inside the installation cavity 12. The lower impact post mounting platform 13 includes a mounting platform body 1301. A lower impact post mounting blind hole 1302 is coaxially opened on the upper end surface of the mounting platform body. The inner diameter of the lower impact post mounting blind hole 1302 is equal to the diameter of the lower impact post 6. The vertical bottom of the lower impact post 6 is installed into the lower impact post mounting blind hole 1302, thereby achieving support for the measuring mechanism near the vertical bottom.

[0071] In this embodiment, the mounting platform body 1301 is rectangular in shape, and the inner diameter of the blind hole 1302 for mounting the down-impact post 6 is d, and the depth is 0.25d to 0.5d. In a further preferred embodiment, the inner diameter of the blind hole 1302 for mounting the down-impact post 6 is 40mm, and the depth is 15mm.

[0072] As a preferred embodiment, the upper end face of the mounting platform body 1301 is also connected to the lower end face of the protective cylinder 14. The protective cylinder 14 is a cylindrical structure with both ends open vertically. The inner diameter of the protective cylinder 14 is larger than the outer diameter of the sleeve 1. A positioning ring 15 is coaxially installed inside the protective cylinder 14 near the upper end face. The outer diameter of the positioning ring 15 is equal to the inner diameter of the protective cylinder 14, and the inner diameter of the positioning ring 15 is equal to the outer diameter of the sleeve 1. The sleeve 1 is installed inside the positioning ring 15 near the top vertically, thereby providing support for the measuring mechanism near the top vertically.

[0073] The pressure-acting end cap 8 is also located on the outer surface of the upper end face of the positioning ring 15.

[0074] In this embodiment, the protective cylinder 14 is a thin-walled steel cylinder, which is a commonly used thin-walled steel cylinder known in the art. In a further preferred embodiment, the inner diameter of the protective cylinder 14 is 335 mm, and the outer diameter of the positioning ring 15 is 335 mm, while its inner diameter is 88 mm.

[0075] As a preferred embodiment, the projectile movement chamber 10 is long and tubular in shape. The cavity inside the projectile movement chamber 10 is a movement cavity 16. A high-speed impact projectile 17 is coaxially arranged inside the movement cavity 16. The high-speed impact projectile 17 is coaxially arranged with the end cap body 801. The cross-section of the high-speed impact projectile 17 is larger than the cross-section of the end cap body 801.

[0076] The high-pressure launch chamber 11 is filled with high-pressure gas. The high-speed impact projectile 17 moves vertically from top to bottom into the mounting cavity 12 under the push of the high-pressure gas and impacts the upper end face of the end cap body 801 inside the mounting cavity 12.

[0077] In this embodiment, high-pressure gas is provided inside the high-pressure launch chamber 11. The high-speed impact projectile 17 moves vertically from top to bottom into the mounting cavity 12 under the push of the high-pressure gas and impacts the upper end face of the end cap body 801 inside the mounting cavity 12, that is, it forms an impact load on the explosive casing 4, thereby obtaining the response law of the explosive charge. By changing the pressure of the high-pressure gas in the high-pressure launch chamber 11, the impact velocity of the high-speed impact projectile 17 is changed. The high-pressure launch chamber 11 is a commonly used high-pressure launch chamber known in the art, and the high-pressure gas is a commonly used high-pressure gas known in the art.

[0078] The method of using and working principle of the device in this embodiment are as follows: The explosive charge 5 is loaded into the charge housing 4, and the charge housing 4 is sealed with a threaded end cap; the charge housing 4 is then installed into the fixed base 2, and 502 glue, which is commonly known in the art, can be applied to the axial bottom of the charge housing 4 to fix the charge housing 4.

[0079] The lower striking post 6, fixed base 2, wedge-shaped loading platform 3, and upper striking post 7 are sequentially installed into the sleeve cavity 101 of sleeve 1 according to their assembly relationship. The pressure-applying end cap 8 is installed on the upper end of the upper striking post 7. The structural schematic diagram of the measuring mechanism after installation is shown below. Figure 1 As shown.

[0080] During the test, the measuring mechanism was subjected to impact loading using the projectile impact method. Specifically, a high-speed impact projectile 17 impacted the pressure end cap 8, which pushed the upper impact column 7 and the wedge-shaped loading platform 3 together to move downward along the central axis of the sleeve 1. The charge casing 4 was placed between the wedge-shaped loading platform 3 and the fixed base 2. After being subjected to an impact load with an angle of 20° with the central axis of the charge casing 4, the charge casing 4 underwent compression deformation, which in turn squeezed the explosive charge 5 inside, causing deformation or even damage, and may eventually lead to ignition.

[0081] During the impact loading process, due to the circumferential limitation of the base body 201 by the base positioning strip 202 and the circumferential limitation of the loading platform body 301 by the loading platform positioning strip 303, the fixed base 2 and the wedge-shaped loading platform 3 will not rotate circumferentially inside the sleeve cavity 101, thereby ensuring that the impact load on the explosive charge 5 is always along the axial direction of the sleeve 1.

[0082] During the test, the speed of the high-speed impact projectile 17 or the thickness of the end cap body 801 can be adjusted to obtain the damage and ignition state of the explosive charge under different impact loads.

[0083] In this embodiment, a 2kg polyethylene pellet is used as the high-speed impact projectile 17. The high-speed impact projectile 17 is used to load the explosive charge 5 onto the end cap 8 with an impact pressure of 400m / s at a fixed speed. The load on the explosive charge 5 is changed by adjusting the thickness of the end cap body 801. When the thickness of the end cap body 801 increases to 20mm, the explosive charge 5 undergoes an ignition reaction, indicating that the critical reaction end cap body 801 thickness is 20mm under an impact speed of 400m / s and an oblique impact of 20°.

Claims

1. A device for measuring the ignition threshold of explosive charge under oblique impact, comprising a measuring mechanism, wherein the measuring mechanism includes a thick-walled cylindrical sleeve (1) arranged vertically, and a cavity coaxially arranged inside the sleeve (1) is a sleeve cavity (101), both vertical ends of the sleeve cavity (101) being open, characterized in that: The sleeve cavity (101) is provided with a fixed base (2) and a wedge-shaped loading platform (3) arranged vertically from bottom to top. A positioning groove (102) is also provided on one side of the inner wall of the sleeve cavity (101) along the radial direction. The positioning groove (102) is arranged vertically and is open at both ends. The fixed base (2) includes a cylindrical base body (201), the outer diameter of which is equal to the inner diameter of the sleeve cavity (101). A protruding base positioning strip (202) is integrally provided on one side outer wall of the base body (201). The base positioning strip (202) is arranged vertically and fits into the positioning groove (102). A cylindrical shell mounting blind hole (203) is opened on the upper end surface of the base body (201). The central axis of the shell mounting blind hole (203) forms an angle with the central axis of the base body (201). The wedge-shaped loading platform (3) includes a cylindrical loading platform body (301), the diameter of which is equal to the inner diameter of the sleeve cavity (101). An inclined surface (302) is provided on the lower end face of the loading platform body (301). The inclined surface (302) is parallel to the inner bottom surface of the housing mounting blind hole (203). The inclined surface (302) does not contact the upper end face of the base body (301). A protruding loading platform positioning strip (303) is also integrally provided at the shortest generatrix on the outer side wall of the loading platform body (301). The loading platform positioning strip (303) is arranged vertically and fits into the positioning groove (102). The shell mounting blind hole (303) is also coaxially mounted with a charge shell (4). The outer diameter of the charge shell (4) is equal to the inner diameter of the shell mounting blind hole (203). The lower end face of the charge shell (4) abuts against the inner bottom face of the shell mounting blind hole (203). The upper end face of the charge shell (4) abuts against the inclined surface (302). The charge shell (4) is also filled with an explosive charge (5). By impacting the upper end face of the loading platform body (301), the ignition threshold of the explosive charge in the explosive charge (5) under oblique impact is measured.

2. The device for measuring the ignition threshold of explosive charge under oblique impact as described in claim 1, characterized in that, The sleeve cavity (101) is also coaxially provided with a cylindrical downward striking post (6). The downward striking post (6) is coaxially arranged at the vertical bottom of the base body (201). The diameter of the downward striking post (6) is equal to the inner diameter of the sleeve cavity (101). The upper end face of the downward striking post (6) is in contact with the lower end face of the base body (201). The lower end face of the downward striking post (6) also extends vertically to the bottom of the sleeve cavity (101). The sleeve cavity (101) is also coaxially provided with a cylindrical upper striking post (7). The upper striking post (7) is coaxially arranged on the vertical top of the loading platform body (301). The diameter of the upper striking post (7) is equal to the inner diameter of the sleeve cavity (101). The lower end face of the upper striking post (7) is in contact with the upper end face of the loading platform body (301). The upper end face of the upper striking post (7) also extends vertically to the top of the sleeve cavity (101).

3. The device for measuring the ignition threshold of explosive charge under oblique impact as described in claim 2, characterized in that, The upper striking post (7) is also provided with a pressure end cap (8) at its vertical top. The pressure end cap (8) includes an end cap body (801) with a circular cross-section. A blind hole (802) in the shape of a blind hole at the bottom of the end cap is coaxially opened on the lower end surface of the end cap body (801). The inner diameter of the blind hole (802) at the bottom of the end cap is equal to the diameter of the upper striking post (7). The vertical top of the upper striking post (7) is installed in the blind hole (802) at the bottom of the end cap.

4. The device for measuring the ignition threshold of explosive charge under oblique impact as described in claim 3, characterized in that, The positioning groove (102) has a semi-circular cross-section; the angle between the central axis of the housing mounting blind hole (203) and the central axis of the base body (201) is 5° to 30°.

5. The device for measuring the ignition threshold of explosive charge under oblique impact as described in claim 3, characterized in that, The sleeve (1), fixed base (2), wedge loading platform (3), charge housing (4), lower impact column (6), upper impact column (7) and pressure end cap (8) are all made of metal.

6. The device for measuring the ignition threshold of explosive charge under oblique impact as described in claim 3, characterized in that, It also includes a test mechanism, which includes, from bottom to top, a coaxially arranged and sequentially sealed installation chamber (9), a projectile movement chamber (10), and a high-pressure launch chamber (11). The mounting chamber (9) is coaxially provided with a mounting cavity (12). The mounting cavity (12) is coaxially installed with a lower impact post mounting platform (13) and a protective cylinder (14) in the vertical direction from bottom to top. The lower impact post mounting platform (13) includes a mounting platform body (1301). A lower impact post mounting blind hole (1302) is coaxially opened on the upper end surface of the mounting platform body. The inner diameter of the lower impact post mounting blind hole (1302) is equal to the diameter of the lower impact post (6). The vertical bottom of the lower impact post (6) is installed into the lower impact post mounting blind hole (1302), thereby achieving support for the measuring mechanism near the vertical bottom.

7. The device for measuring the ignition threshold of explosive charge under oblique impact as described in claim 6, characterized in that, The upper end face of the mounting platform body (1301) is also connected to the lower end face of the protective cylinder (14); the protective cylinder (14) is a cylindrical structure with both ends open vertically. The inner diameter of the protective cylinder (14) is larger than the outer diameter of the sleeve (1). A positioning ring (15) is coaxially installed inside the protective cylinder (14) near the upper end face. The outer diameter of the positioning ring (15) is equal to the inner diameter of the protective cylinder (14). The inner diameter of the positioning ring (15) is equal to the outer diameter of the sleeve (1). The sleeve (1) is installed in the positioning ring (15) near the top vertically, thereby achieving support for the measuring mechanism near the top vertically. The pressure-acting end cap (8) is also located on the outer side of the upper end face of the positioning ring (15).

8. The device for measuring the ignition threshold of explosive charge under oblique impact as described in claim 6, characterized in that, The projectile movement chamber (10) is long and tubular in shape. The cavity inside the projectile movement chamber (10) is a movement chamber (16). A high-speed impact projectile (17) is coaxially arranged inside the movement chamber (16). The high-speed impact projectile (17) is coaxially arranged with the end cap body (801). The cross-section of the high-speed impact projectile (17) is larger than the cross-section of the end cap body (801). The high-pressure launch chamber (11) is filled with high-pressure gas. The high-speed impact projectile (17) moves vertically from top to bottom into the mounting cavity (12) under the push of the high-pressure gas and impacts the upper end face of the end cap body (801) in the mounting cavity (12).

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