Projectile body icebreaking water entry test device

Abstract

The invention relates to a projectile body icebreaking water entry test device which comprises a base, a projectile body launching assembly, a water entry assembly and an observation assembly, the projectile body launching assembly is fixedly connected with the base and is provided with a launching end pointing vertically downwards, the water entry assembly comprises a water tank arranged below the launching end, the water tank is fixedly connected with the base, and the observation assembly is fixedly connected with the base. The observation assembly comprises a camera, a reflective mirror, a first light source, a second light source, a third light source and a speckle which are all connected with the base, the camera is arranged on the peripheral side of the ice plate, the first light source is arranged above the ice plate, the second light source is arranged on the peripheral side of the ice plate, and the third light source is arranged below the ice plate; the second light source is normally opened, the first light source is turned on, the third light source is turned off, and by spraying speckles on the upper surface of the ice plate, the camera can obtain the evolution process of a strain field and a displacement field before the ice plate on the water surface is damaged, and the camera can also capture images of an ice layer crack propagation process, a damage mode, a projectile body movement posture and a trajectory track.

Description

Technical Field

[0001] The invention relates to the technical field of ice breaking, and in particular to a projectile ice breaking and water entry test device. Background Art

[0002] With the increasing exploration of marine resources in polar ice areas in my country, for thick ice areas that polar research vessels cannot reach, we can use helicopters carried by research vessels to quickly launch multiple new cross-ice water medium projectiles carrying small environmental detectors into the ice areas. The environmental detectors that pop up after breaking through the ice and entering the water can collect data on the under-ice marine topography, fossil energy and marine life.

[0003] In addition, ice floods, as a natural disaster, mainly occur in high-altitude coastal areas and the Yellow River basin, posing a serious threat to the lives of local residents and the surrounding ecological environment. The method of launching a projectile from high altitude and then exploding underwater after penetrating the ice sheet has become a commonly used means of ice breaking. Ignoring the influence of the previous penetration and icebreaking process, a large number of scholars have conducted research on underwater explosion load icebreaking. However, the previous process of projectile penetration and icebreaking into the water may have an important impact on the later underwater explosion icebreaking capability.

[0004] It is known that the research on the problem of projectile penetration, breaking ice and entering water is still very scarce, and the available public literature is relatively limited. In summary, it is urgent to build a projectile breaking ice and entering water test device and carry out corresponding model test research, in-depth study of the ice crack expansion process and damage mode, projectile movement posture and ballistic trajectory during the projectile penetration, breaking ice and entering water. The relevant research results will provide experimental technical support for the development of new projectiles that cross ice and water media. Summary of the invention

[0005] In view of this, a projectile breaking ice and entering water test device is provided.

[0006] The present invention provides a projectile ice-breaking water entry test device, comprising a base, a projectile launching assembly, a water entry assembly and an observation assembly, wherein the projectile launching assembly is fixedly connected to the base and has a launching end pointing vertically downward, the water entry assembly comprises a water cylinder arranged below the launching end, the water cylinder is fixedly connected to the base and filled with water, an ice plate is placed on the water, the observation assembly comprises a camera, a reflector, a first light source, a second light source, a third light source and speckle, all of which are connected to the base, the camera is arranged at a peripheral position of the ice plate, the first light source is arranged The first light source is arranged above the ice plate, the second light source is arranged on the peripheral side of the ice plate, and the third light source is arranged below the ice plate, and the speckle can be coated on the top surface of the ice plate; wherein the first light emitted by the first light source irradiates the ice plate coated with the speckle and then reflects to the reflector to form an image, and the camera collects the image pattern in the reflector, the second light emitted by the second light source passes through the ice plate to the image collection end of the camera, and the third light emitted by the third light source passes through the ice plate not coated with the speckle and then reflects to the image collection end of the camera through the reflector.

[0007] Furthermore, the reflector is movably connected to the base, and the reflector is configured to adjust its angle so that the aspect ratio of the ice plate in the image in the reflector is consistent with the actual aspect ratio of the ice plate.

[0008] Furthermore, the speckles include a matte black paint coating and a matte white paint coating, the matte black paint coating is evenly applied to the top surface of the ice plate, the matte white paint coating is evenly applied to the top surface of the matte black paint coating, and the coverage area of ​​the matte white paint coating is smaller than the coverage area of ​​the matte black paint coating.

[0009] Furthermore, the projectile launching assembly includes a gun barrel, a bullet and a high-pressure gas source, a gun barrel having a chamber for launching the bullet formed inside, the gun barrel being vertically arranged and fixedly connected to the base, the bottom end of the gun barrel being the launching end, and the top end of the gun barrel being connected to the gas outlet end of the high-pressure gas source.

[0010] Furthermore, a loading port is formed on the side wall of the gun barrel, and an anti-falling elastic member for elastically fixing the bullet is arranged inside the gun barrel and below the loading port. The projectile launching assembly also includes a sealing sleeve which is sleeved on the gun barrel and is slidably and sealingly connected to the gun barrel, and the sealing sleeve can slide to a position to close the loading port.

[0011] Furthermore, the anti-falling elastic member includes an annular plate, multiple springs and multiple steel balls. The annular plate is coaxially built into the gun barrel. The inner wall of the annular plate is provided with multiple cylindrical grooves. Multiple springs are respectively built into the multiple cylindrical grooves. One end of the spring is fixedly connected to the annular plate, and the other end of the spring is fixedly connected to the steel balls. The extension direction of the multiple springs is arranged along the radial direction of the gun barrel.

[0012] Furthermore, the anti-falling elastic member also includes a plurality of connecting screws and an annular sealing cover, wherein the plurality of connecting screws are evenly arranged along the circumference of the gun barrel, the free ends of the connecting screws pass through the gun barrel and are threadedly connected to the annular plate, the annular sealing cover is elastic and coaxially built into the gun barrel, the bottom of the annular sealing cover abuts against the top of the annular plate, and the inner ring size of the annular sealing cover is smaller than the diameter of the bullet.

[0013] Furthermore, the water inlet assembly also includes a PVC crystal plate built into the water tank and immersed in water.

[0014] Furthermore, the device also includes a positioning component, which includes two positioning tubes and four waterproof transparent tapes relatively arranged in front and behind the ice plate, the opposite sides of the two positioning tubes are respectively abutted against the front and rear sides of the ice plate, and the two ends of the two positioning tubes are fixed to the inner wall of the water cylinder via the four waterproof transparent tapes, and the two ends of the two positioning tubes are respectively aligned with the left and right sides of the ice plate.

[0015] Furthermore, each of the positioning tubes includes two vertical tubes, a horizontal tube and two connecting tubes. The two vertical tubes in each of the positioning tubes are fixedly connected to the inner wall of the water cylinder via the waterproof transparent tape and are respectively aligned with the left and right sides of the ice plate. The bottom ends of the two vertical tubes in each of the positioning tubes are respectively fixedly connected to the two ends of the horizontal tube via the two connecting tubes, and the opposite sides of the two horizontal tubes are respectively abutted against the front and rear sides of the ice plate.

[0016] Compared with the prior art, an ice plate is placed in a water tank, the ice plate floats in the water tank and the position of the ice plate is adjusted so that its center faces the launching end of the projectile launching assembly. The second light source is normally on, the first light source is turned on and the third light source is turned off. By spraying speckle on the upper surface of the ice plate, combined with the proportional imaging and digital image correlation method captured by the camera in the reflector, the evolution process of the strain field and displacement field of the ice plate floating on the water surface before damage occurs can be obtained, which can reflect the deformation characteristics of the ice plate. The camera can also capture images of the ice layer crack expansion process and damage mode, the projectile movement posture and ballistic trajectory. At the same time, the first light source can be turned off and the third light source can be turned on. No speckle is sprayed on the ice plate. The camera is used to capture clearer images of the ice layer crack expansion process and damage mode, the projectile movement posture and ballistic trajectory. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the overall structure of a projectile breaking ice and entering water test device provided by an embodiment of the present invention; Figure 2 A working principle diagram of an observation component in a projectile breaking ice and entering water test device provided by an embodiment of the present invention; Figure 3 A cross-sectional view of an anti-falling elastic member in a projectile breaking ice and entering water test device provided by an embodiment of the present invention; Figure 4 A longitudinal sectional view of an anti-falling elastic member in a projectile breaking ice and entering water test device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0019] like Figure 1-2 As shown, a projectile icebreaking and water entry test device provided by the present invention includes a base 100, a projectile launching assembly 200, a water entry assembly 300 and an observation assembly 400, wherein the projectile launching assembly 200 is fixedly connected to the base 100 and has a launching end pointing vertically downward, the water entry assembly 300 includes a water cylinder 310 arranged below the launching end, the water cylinder 310 is fixedly connected to the base 100 and filled with water, an ice plate M is placed on the water, the observation assembly 400 includes a camera 410, a reflector 420, a first light source 430, a second light source 440, a third light source 450 and a speckle 460, all of which are connected to the base 100, the camera 410 is arranged at the peripheral side of the ice plate M, the The first light source 430 is arranged above the ice plate M, the second light source 440 is arranged on the peripheral side of the ice plate M, and the third light source 450 is arranged below the ice plate M. The speckle 460 can be coated on the top surface of the ice plate M; wherein the first light emitted by the first light source 430 irradiates the ice plate M coated with the speckle 460 and then reflects to the reflector 420 to form an image, and the camera 410 collects the imaging pattern in the reflector 420, the second light emitted by the second light source 440 passes through the ice plate M to the image collection end of the camera 410, and the third light emitted by the third light source 450 passes through the ice plate M not coated with the speckle 460 and then reflects to the image collection end of the camera 410 through the reflector 420.

[0020] During implementation, the ice plate M is placed in the water tank 310, the ice plate M floats in the water tank 310 and the position of the ice plate M is adjusted so that its center is facing the launch end of the projectile launch assembly 200, the second light source 440 is always on, the first light source 430 is turned on and the third light source 450 is turned off, by spraying the speckle 460 on the upper surface of the ice plate M, combined with the proportional imaging and digital image correlation method captured by the camera 410 in the reflector 420, the evolution process of the strain field and the displacement field of the ice plate M floating on the water surface before damage occurs can be obtained, which can reflect the deformation characteristics of the ice plate M, and the camera 410 can also capture the images of the ice layer crack expansion process and damage mode, the projectile movement posture and ballistic trajectory. At the same time, the first light source 430 can be turned off and the third light source 450 can be turned on, and the speckle 460 is not sprayed on the ice plate M. The camera 410 is used to capture the ice layer crack expansion process and damage mode, the projectile movement posture and ballistic trajectory with clearer images.

[0021] The base 100 in this embodiment is used to carry the missile launching assembly 200, the water entry assembly 300 and the observation assembly 400. It is made of a stainless steel pipe, and of course other materials can also be used. The embodiment of the present invention does not limit this, and a stable connection is preferred.

[0022] The projectile launching assembly 200 in this embodiment is fixedly connected to the base 100 and has a launching end pointing vertically downward.

[0023] In one embodiment, the projectile launching assembly 200 includes a barrel 210, a bullet 220 and a high-pressure gas source 230. The barrel 210 is provided with a chamber for launching the bullet 220. The barrel 210 is vertically arranged and fixedly connected to the base 100. The bottom end of the barrel 210 is the launching end, and the top end of the barrel 210 is connected to the gas outlet end of the high-pressure gas source 230. The high-pressure gas source 230 delivers high-pressure gas into the barrel 210, so that the bullet 220 in the barrel 210 is launched and impacts the ice plate M, so as to realize the process of breaking the ice of the projectile.

[0024] Among them, a loading port 211 is formed on the side wall of the gun barrel 210, and a loading port 211 is opened on the side wall of the gun barrel 210. An anti-falling elastic member 212 for elastically fixing the bullet 220 is arranged inside the gun barrel 210 and below the loading port 211. The projectile launching assembly 200 also includes a sealing sleeve 213 which is sleeved on the gun barrel 210 and is slidably and sealingly connected to the gun barrel 210. The sealing sleeve 213 can slide to a position to close the loading port 211.

[0025] After the bullet 220 is loaded into the loading port 211, the bullet 220 moves to the position where it engages with the anti-dropping elastic member 212 under its own weight, and the sealing sleeve 213 is slid to the loading port 211 to close the loading port 211. The compressed air source is used to align the high-pressure air source 230 with the gun barrel 210, and the bullet 220 can be accelerated to be ejected from the gun barrel 210 under the elastic deformation of the anti-dropping elastic member 212.

[0026] like Figure 3 As shown, in one embodiment, the anti-falling elastic member 212 includes an annular plate 212a, a plurality of springs 212b and a plurality of steel balls 212c, the annular plate 212a is coaxially built into the gun barrel 210, a plurality of cylindrical grooves are provided on the inner wall of the annular plate 212a, a plurality of springs 212b are respectively built into the plurality of cylindrical grooves, one end of the spring 212b is fixedly connected to the annular plate 212a, the other end of the spring 212b is fixedly connected to the steel ball 212c, and the extension direction of the plurality of springs 212b are all arranged along the radial direction of the gun barrel 210.

[0027] like Figure 4 As shown, the anti-falling elastic member 212 also includes a plurality of connecting screws 212d and an annular sealing cover 212e, wherein the plurality of connecting screws 212d are evenly arranged along the circumference of the gun barrel 210, the free ends of the connecting screws 212d pass through the gun barrel 210 and are threadedly connected to the annular plate 212a, the annular sealing cover 212e is elastic and coaxially built into the gun barrel 210, the bottom of the annular sealing cover 212e abuts against the top of the annular plate 212a, and the inner ring size of the annular sealing cover 212e is smaller than the diameter of the bullet 220.

[0028] In one embodiment, an acceleration sensor may be installed on the bullet 220 to obtain the ice breaking load and water entry load of the bullet 220 during the process of breaking ice and entering water, wherein the acceleration sensor may be placed from the tail of the bullet 220, and the acceleration sensor may be fixed by passing a bolt through the bottom cover, and the bottom cover may be fixedly connected by a thread on the inner side of the tail of the bullet 220. Meanwhile, the high-pressure gas source 230 may be realized by a compressor and a gas pressure tank.

[0029] It is understandable that in addition to the acceleration sensor, various sensors such as pressure sensors and displacement sensors can also be installed inside the bullet 220 to obtain various data results during the entire process of the bullet 220 penetrating, breaking ice and entering water.

[0030] The water entry assembly 300 in this embodiment includes a water cylinder 310 disposed below the launch end. The water cylinder 310 is fixedly connected to the base 100 and is filled with water, and an ice plate M is placed on the water.

[0031] In one embodiment, the water tank 310 is an acrylic tank, which not only has certain impact resistance, but also has a transparent material, which does not affect the penetration of the light source and the shooting of the camera 410. The inside of the water tank 310 is used to store low-temperature water with a static temperature close to 0°C.

[0032] In order to prevent the bullet 220 from penetrating the thick ice plate M and the remaining kinetic energy from directly acting on the water tank 310, causing damage to the water tank 310, in one embodiment, the water entry assembly 300 further includes a PVC crystal plate 320 built into the water tank 310 and immersed in water. The four corners of the PVC crystal plate 320 can be hung on the water tank 310 by wires 321. The PVC crystal plate 320 can quickly reduce the speed of the bullet 220 after breaking the ice and entering the water, preventing the bottom of the water tank 310 from being damaged by the impact.

[0033] The observation assembly 400 in this embodiment includes a camera 410, a reflector 420, a first light source 430, a second light source 440, a third light source 450 and a speckle 460, all of which are connected to the base 100. The camera 410 is arranged at the peripheral side of the ice plate M, the first light source 430 is arranged at the upper position of the ice plate M, the second light source 440 is arranged at the peripheral side of the ice plate M, the third light source 450 is arranged at the lower position of the ice plate M, and the speckle 460 can be coated on the ice plate. M's top surface; wherein, the first light emitted by the first light source 430 irradiates the ice plate M coated with the speckle 460 and then reflects to the reflector 420 to form an image, and the camera 410 collects the imaging pattern in the reflector 420; the second light emitted by the second light source 440 passes through the ice plate M to the image collection end of the camera 410; the third light emitted by the third light source 450 passes through the ice plate M not coated with the speckle 460 and then reflects to the image collection end of the camera 410 via the reflector 420.

[0034] The combination of the camera 410 and the reflector 420 can realize the synchronous observation of the side view and the top view of the ice plate M. The image of the side view in the camera 410 can be obtained by the calibration label pasted on the left side of the acrylic cylinder and the image processing technology to obtain the initial impact velocity of the slender body (bullet 220) penetrating the ice plate M and the residual velocity after entering the water. At the same time, the crack propagation process after the surface of the ice plate M is impacted by the projectile can be observed through the optical reflection principle. The size of the image of the surface of the ice plate M in the reflector is closely related to the size of the angle between the reflector and the surface of the ice plate M, the position of the camera 410, the size and position of the ice plate M, the position of the water surface, etc. By repeatedly adjusting their relative positions, it is ensured that the aspect ratio of the mirror image of the surface of the ice plate M observed in the camera 410 is consistent with the aspect ratio of the real ice plate M. Subsequently, the digital image correlation method (Digital Image Correlation, abbreviated DIC) can be used to obtain the two-dimensional strain field and displacement field evolution process of the surface of the ice plate M when the ice plate M is impacted by the bullet 220.

[0035] The camera 410 is a high-speed camera for capturing a proportional image of the ice plate M in the reflector 420, and can also be used to capture images of the ice layer crack expansion process and damage mode, the projectile movement posture and ballistic trajectory.

[0036] In one embodiment, two cameras 410 can be used in combination with a digital image correlation method to obtain the evolution of the displacement field and strain field on the surface and in the thickness direction of the undamaged front of the ice plate M.

[0037] The reflector 420 is movably connected to the base 100, and the reflector 420 is configured to adjust its angle so that the aspect ratio of the ice plate M in the image in the reflector 420 is consistent with the aspect ratio of the actual ice plate M. To achieve the above-mentioned adjustable reflector 420, in one embodiment, the back of the reflector 420 is fixed to the base 100 via a hose 421 and a plate 422 in sequence, and the reflector 420 is adjusted by the deformation of the hose 421. The angle between the reflector 420 and the surface of the ice plate M can be adjusted in the range of 30 to 60 degrees.

[0038] It is understandable that the reflector 420 adopts a PMMA plastic lens, which can effectively prevent the lens from being broken due to ricocheting after the projectile hits the ice plate M or splashing of ice fragments, compared with the traditional glass lens.

[0039] Among them, the first light source 430, the second light source 440 and the third light source 450 can all be implemented by LED lights. The second light source 440 is placed on the right side of the acrylic cylinder to provide a light source for the front view in the camera 410; the first light source 430 is placed near the barrel 210 above the acrylic cylinder to provide a light source for the image of the speckle 460 on the surface of the ice plate M in the camera 410. When the speckle 460 is not sprayed on the surface of the ice plate M, the first light source 430 will be turned off, and the third light source 450 placed obliquely below the acrylic cylinder will be turned on to provide a light source for the surface image of the transparent ice plate M in the camera 410.

[0040] Among them, the speckle 460 includes a matte black paint coating and a matte white paint coating, the matte black paint coating is evenly coated on the top surface of the ice plate M, the matte white paint coating is evenly coated on the top surface of the matte black paint coating, and the coverage area of ​​the matte white paint coating is smaller than the coverage area of ​​the matte black paint coating.

[0041] In the test of projectile breaking ice and entering water, since the ice plate M floats on the surface of the water, the position of the ice plate M is difficult to determine, which affects the accuracy of the test results. For this reason, in this embodiment, the device also includes a positioning assembly 500, which includes two positioning tubes 510 and four waterproof transparent tapes 520 relatively arranged in front and behind the ice plate M. The opposite sides of the two positioning tubes 510 are respectively abutted against the front and rear sides of the ice plate M, and the two ends of the two positioning tubes 510 are fixed to the inner wall of the water cylinder 310 via the four waterproof transparent tapes 520. The two ends of the two positioning tubes 510 are respectively aligned with the left and right sides of the ice plate M. Through the above arrangement, it is convenient to adjust the center position of the ice plate M floating on the water surface to be directly below the barrel 210.

[0042] The positioning tube 510 is a transparent tube to avoid blocking the ice plate M and affecting the shooting. At the same time, the positioning tube 510 is a soft tube that can be bent into a desired shape at will, and can adopt, for example, a PU soft tube.

[0043] In one embodiment, each of the positioning tubes 510 includes two vertical tubes, a horizontal tube and two connecting tubes. The two vertical tubes in each of the positioning tubes 510 are fixedly connected to the inner wall of the water cylinder 310 via the waterproof transparent tape 520 and are respectively aligned with the left and right sides of the ice plate M. The bottom ends of the two vertical tubes in each of the positioning tubes 510 are respectively fixedly connected to the two ends of the horizontal tube via the two connecting tubes, and the opposite sides of the two horizontal tubes are respectively abutted against the front and rear sides of the ice plate M.

[0044] Compared with existing technologies: 1) By spraying the surface of the ice plate M floating on the water with speckles 460 and combining the proportional imaging and digital image correlation method in the reflector 420, the evolution process of the strain field and displacement field of the ice plate M before it is destroyed can be obtained.

[0045] 2) The use of the multi-layered transparent PVC crystal plates 320 suspended in the water can not only ensure the lighting effect of the bottom of the ice plate M, but also quickly reduce the speed of the bullet after breaking through the ice and entering the water, thereby ensuring that the bottom of the water tank 310 is protected from damage caused by the impact of the bullet 220.

[0046] 3) The PMMA plastic lens and the hose 421 can be used to quickly adjust the angle and relative position between the reflector 420 and the horizontal plane, thereby improving the test efficiency and avoiding the test safety problem caused by the breakage of the reflector 420.

[0047] 4) The anti-drop elastic member 212 provided in the present application has a simple structure, is stable and reliable, and can ensure that the head of the loaded bullet 220 is stuck inside the barrel 210 without being affected by air pressure, and is quickly ejected under the impact of air pressure.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A projectile breaking ice and entering water test device, characterized in that: include: Pedestal; A projectile launching assembly, which is fixedly connected to the base and has a launching end pointing vertically downward; A water entry assembly, comprising a water cylinder disposed below the launch end, the water cylinder being fixedly connected to the base and filled with water, with an ice plate placed on the water; An observation assembly, comprising a camera, a reflector, a first light source, a second light source, a third light source and a speckle, all of which are connected to the base, wherein the camera is arranged at a peripheral position of the ice plate, the first light source is arranged at an upper position of the ice plate, the second light source is arranged at a peripheral position of the ice plate, the third light source is arranged at a lower position of the ice plate, and the speckle can be coated on the top surface of the ice plate; wherein, The first light emitted by the first light source irradiates the ice plate coated with speckles and then reflects to the reflector to form an image, and the camera collects the image pattern in the reflector; The second light emitted by the second light source passes through the ice plate to the image acquisition end of the camera; The third light emitted by the third light source passes through the ice plate not coated with speckles and is reflected by the reflector to the image acquisition end of the camera.

2. The projectile breaking ice and entering water test device according to claim 1, characterized in that: The reflector is movably connected to the base, and the reflector is configured to adjust its angle so that the length-to-width ratio of the ice plate in the image in the reflector is consistent with the actual length-to-width ratio of the ice plate.

3. The projectile breaking ice and entering water test device according to claim 1, characterized in that: The speckles include a matte black paint coating and a matte white paint coating, the matte black paint coating is evenly coated on the top surface of the ice plate, the matte white paint coating is evenly coated on the top surface of the matte black paint coating, and the coverage area of ​​the matte white paint coating is smaller than the coverage area of ​​the matte black paint coating.

4. The projectile breaking ice and entering water test device according to claim 1, characterized in that: The projectile launching assembly includes a gun barrel, a bullet and a high-pressure gas source. A gun barrel is formed inside the gun barrel for launching the bullet. The gun barrel is vertically arranged and fixedly connected to the base. The bottom end of the gun barrel is the launching end, and the top end of the gun barrel is connected to the gas outlet end of the high-pressure gas source.

5. The projectile breaking ice and entering water test device according to claim 4, characterized in that: A loading port is formed on the side wall of the gun barrel, and a loading port is opened on the side wall of the gun barrel. An anti-falling elastic member for elastically fixing the bullet is arranged inside the gun barrel and below the loading port. The projectile launching assembly also includes a sealing sleeve which is sleeved on the gun barrel and is slidably and sealingly connected to the gun barrel, and the sealing sleeve can slide to a position to close the loading port.

6. The projectile breaking ice and entering water test device according to claim 5, characterized in that: The anti-falling elastic member comprises an annular plate, a plurality of springs and a plurality of steel balls; the annular plate is coaxially built into the gun barrel; a plurality of cylindrical grooves are formed on the inner wall of the annular plate; a plurality of springs are respectively built into the plurality of cylindrical grooves; one end of the spring is fixedly connected to the annular plate; the other end of the spring is fixedly connected to the steel balls; and the extension directions of the plurality of springs are all arranged along the radial direction of the gun barrel.

7. The projectile breaking ice and entering water test device according to claim 6, characterized in that: The anti-falling elastic member also includes a plurality of connecting screws and an annular sealing cover. The plurality of connecting screws are evenly arranged along the circumference of the gun barrel. The free ends of the connecting screws pass through the gun barrel and are threadedly connected to the annular plate. The annular sealing cover is elastic and coaxially built into the gun barrel. The bottom of the annular sealing cover abuts against the top of the annular plate. The inner ring size of the annular sealing cover is smaller than the diameter of the bullet.

8. The projectile breaking ice and entering water test device according to claim 1, characterized in that: The water inlet assembly also includes a PVC crystal plate which is built into the water tank and immersed in water.

9. The projectile breaking ice and entering water test device according to claim 1, characterized in that: The device also includes a positioning component, which includes two positioning tubes and four waterproof transparent tapes that are relatively arranged in front and behind the ice plate. The opposite sides of the two positioning tubes are respectively abutted against the front and back sides of the ice plate, and the two ends of the two positioning tubes are fixed to the inner wall of the water cylinder via the four waterproof transparent tapes. The two ends of the two positioning tubes are respectively aligned with the left and right sides of the ice plate.

10. The projectile breaking ice and entering water test device according to claim 9, characterized in that: Each of the positioning tubes includes two vertical tubes, a horizontal tube and two connecting tubes. The two vertical tubes in each of the positioning tubes are fixedly connected to the inner wall of the water cylinder via the waterproof transparent tape and are respectively aligned with the left and right sides of the ice plate. The bottom ends of the two vertical tubes in each of the positioning tubes are respectively fixedly connected to the two ends of the horizontal tube via the two connecting tubes, and the opposite sides of the two horizontal tubes are respectively in contact with the front and rear sides of the ice plate.

Images