A two-stage ultra-high-speed projectile sabot separation device

Abstract

The present invention discloses a two-stage ultra-high-speed projectile sabot separation device, which includes a separation cylinder, an observation window I, an observation window II, two sets of support seats, and a support platform. The separation cylinder includes a muzzle section and a separation section. The observation window I is arranged on the muzzle section, and the observation window II is arranged on the separation section. The bottom ends of the two sets of support seats are fixedly connected to the support platform, and the top ends are connected to the separation cylinder. A partition plate I is arranged inside the separation cylinder, a central hole is arranged on the partition plate I, and an isolation sleeve I is arranged at the central hole. A clamping groove is arranged inside the separation section, and a partition plate II is arranged inside the clamping groove. In the present invention, by arranging the two-stage ultra-high-speed projectile sabot separation device at the tail of the secondary light gas gun launch tube, the problems that the existing system cannot both ensure the high-vacuum environment of the launch tube and the target chamber, and is convenient for the installation of magnetic velocity measurement and does not cause sabot pollution to the target chamber are effectively solved. The device can realize the stable separation of the projectile and the sabot, without causing damage to the projectile and without polluting the target chamber environment.

Description

Technical Field

[0001] The present invention relates to the field of hypervelocity launch technology, and particularly to a two-stage hypervelocity projectile sabot separation device. Background Art

[0002] In a two-stage light gas gun experiment, in order to prevent the high-speed movement of a metal projectile from causing frictional damage and high-temperature ablation damage to the launch tube, it is necessary to launch the projectile with the aid of a plastic sabot. The use of the sabot can also seal the gap between the projectile and the launch tube, reduce the leakage of high-pressure driving gas, and is conducive to increasing the launch speed of the projectile. After the sabot and the projectile fly out of the muzzle together, in order to avoid the interference of the sabot on the impact effect, it is necessary to use the sabot separation technology to block the sabot and only let the projectile fly along the original trajectory. Currently, the separation technologies mainly include forced separation and pneumatic separation. The forced separation technology refers to applying a blocking device on the trajectory to forcibly separate the sabot from the projectile. However, this technology mainly has two defects. One is that the blocker cannot intercept the part of the sabot sheared behind the projectile, causing this part of the sabot to collide with the projectile against the target plate together, affecting the analysis of the impact effect. The other is that the high-temperature and high-pressure liquid flow generated during the process of the blocker intercepting the sabot erodes the projectile, deforming the projectile or even making it incomplete, also affecting the analysis of the impact effect. In pneumatic separation, the sabot is no longer a complete part but is divided into two or three pieces. Its outer diameter is the same as the inner diameter of the launch tube and it flies with the projectile during launch. After flying out of the muzzle and entering the gas field, it will be affected by the combined action of the high-pressure gas shock wave and the surrounding flow field, causing the sabot to generate lateral aerodynamic force, the front part of the split sabot to open, gradually deviate from the trajectory, and thus separate the sabot from the projectile.

[0003] During the hypervelocity launch process, in order to enable the projectile to obtain an ultra-high speed, the launch tube needs to be evacuated, and the separation of the sabot requires providing a non-vacuum environment after the projectile and the sabot fly out of the launch tube. To address this problem, currently there are mainly two forms of pneumatic separation. One is to seal the launch tube and evacuate it, leaving a certain gas pressure inside the target chamber. After the projectile and the sabot fly out of the launch tube, they are gradually separated in the low-vacuum target chamber. The disadvantage is that the target chamber cannot provide the high-vacuum environment required for the experiment. The other is not to seal the launch tube and directly place a separation cylinder with a certain pressure behind the launch tube. Although it can ensure the vacuum environment of the target chamber, it cannot be operated for a light gas gun system that uses the magnetic induction principle for velocity measurement. Moreover, in both of the above two methods, the sabot enters the target chamber and collides with the interception target at hypervelocity, generating a large amount of carbonized substances and polluting the cleanliness of the experimental process. Therefore, it is necessary to propose a two-stage hypervelocity projectile sabot separation device. Summary of the Invention

[0004] The purpose of the present invention is to propose a two-stage hypervelocity projectile sabot separation device to solve the above problems.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A two-stage ultra-high-speed projectile sabot separation device, comprising a separation cylinder, an observation window I, an observation window II, two sets of support seats, and a support platform. Both the observation window I and the observation window II can be used as projectile attitude observation windows. The separation cylinder includes a muzzle section and a separation section. The right end of the separation section is connected to the target chamber, which is the place where the sabot and the projectile are separated. The observation window I is arranged on the muzzle section. Through the observation window I, the magnetic velocity measurement device and the diaphragm are installed, and the vacuum pumping operation can also be realized through the observation window I. The installation and replacement of the partition plate II can be realized through the observation window II. The observation window II is arranged on the separation section. The bottom ends of the two sets of support seats are fixedly connected to the support platform, and the top ends are connected to the separation cylinder. A partition plate I is arranged inside the separation cylinder. A central hole is arranged on the partition plate I, and an isolation sleeve I is arranged at the central hole. The muzzle section and the separation section are isolated through the isolation sleeve I. A clamping groove is arranged inside the separation section, and a partition plate II is arranged inside the clamping groove to ensure that after the sabot deviates from the axis under the action of gas and impacts the partition plate II, it will not enter the target chamber and thus pollute the experimental environment. The projectile passes through the right isolation sleeve II and enters the target chamber to collide with the target.

[0007] Preferably, a flange is connected to the end of the separation section. A circular hole is arranged at the center of the flange, and an isolation sleeve II is arranged at the circular hole to isolate the sabot and prevent the sabot from entering the target chamber and polluting the environment.

[0008] Preferably, diaphragms are arranged inside both the isolation sleeve I and the isolation sleeve II, so that after the projectile sabot impacts the plastic diaphragm in the muzzle section and enters the separation section, the sabot generates a lateral force under the action of aerodynamic force and gradually separates from the projectile. O-ring sealing grooves are also arranged on the outer side walls of the isolation sleeve I and the isolation sleeve II to facilitate enhancing the sealing performance when the isolation sleeve I and the isolation sleeve II are installed.

[0009] Preferably, the muzzle section is connected to the launch tube, and a launch tube sealing assembly is arranged inside the muzzle section. The launch tube sealing assembly is a cylindrical surface double O-ring pressurizing ring to enhance the connection sealing performance between the launch tube and the muzzle section.

[0010] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows:

[0011] In this application, by setting a two-stage ultra-high-speed projectile sabot separation device at the tail of the launch tube of the two-stage light gas gun, the problems that the existing system cannot both ensure the high-vacuum environment of the launch tube and the target chamber, and is convenient for the installation of magnetic velocity measurement and does not generate sabot pollution to the target chamber are effectively solved. This device can realize the stable separation of the projectile and the sabot, without causing damage to the projectile and without polluting the target chamber environment. Description of the Drawings

[0012] Figure 1 Shows a schematic structural diagram of a two-stage ultra-high-speed projectile sabot separation device provided according to an embodiment of the present invention;

[0013] Figure 2 Shows a schematic structural diagram of a separation cylinder of a two-stage ultra-high-speed projectile sabot separation device provided according to an embodiment of the present invention;

[0014] Figure 3 Shows a schematic structural diagram of a first isolation sleeve of a two-stage ultra-high-speed projectile sabot separation device provided according to an embodiment of the present invention;

[0015] Figure 4 Shows a schematic diagram of the positions of a second partition plate and a second observation window of a two-stage ultra-high-speed projectile sabot separation device provided according to an embodiment of the present invention;

[0016] Figure 5 Shows a schematic connection diagram of a card slot and a second partition plate of a two-stage ultra-high-speed projectile sabot separation device provided according to an embodiment of the present invention.

[0017] Legend Explanation:

[0018] 1. Separation cylinder; 101. Muzzle section; 102. Separation section; 2. First observation window; 3. Second observation window; 4. Support seat; 5. Support platform; 6. First isolation sleeve; 7. Second isolation sleeve; 8. Launch tube sealing assembly; 9. Second partition plate; 10. Card slot; 11. Diaphragm; 12. O-ring sealing groove; 13. First partition plate. Detailed Embodiment

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0020] Please refer to Figures 1-5 , the present invention provides a technical solution:

[0021] A two-stage ultra-high-speed projectile sabot separation device, comprising a separation cylinder 1, an observation window 1 2, an observation window 2 3, two sets of support seats 4, and a support platform 5. The separation cylinder 1 is a cylindrical structure with an inner diameter of 400 mm and a length of 3000 mm. The separation cylinder 1 includes a muzzle section 101 and a separation section 102. The muzzle section 101 is connected to the launch tube, and a launch tube sealing assembly 8 is arranged inside the muzzle section 101. The launch tube sealing assembly 8 is a cylindrical surface double O-ring pressurized ring to achieve the connection and sealing between the muzzle section 101 and the launch tube. A flange is connected to the end of the separation section 102, a circular hole is arranged at the center of the flange, an isolation sleeve two 7 is arranged at the circular hole, a card slot 10 is arranged inside the separation section 102, and a partition plate two 9 is arranged inside the card slot 10. The observation window 1 2 is arranged on the muzzle section 101, and the observation window 2 3 is arranged on the separation section 102. The bottom ends of the two sets of support seats 4 are fixedly connected to the support platform 5, and the top ends are connected to the separation cylinder 1. A partition plate one 13 is arranged inside the separation cylinder 1, a central hole is arranged on the partition plate one 13, an isolation sleeve one 6 is arranged at the central hole, and the partition plate one 13 is 690 mm away from the left end face of the separation cylinder 1, separating the separation cylinder 1 into two spaces, namely the muzzle section 101 and the separation section 102.

[0022] Specifically, as Figure 3 shown, diaphragms 11 are arranged inside both the isolation sleeve one 6 and the isolation sleeve two 7. O-ring sealing grooves 12 are also arranged on the outer side walls of the isolation sleeve one 6 and the isolation sleeve two 7. The isolation sleeve one 6 and the isolation sleeve two 7 are both connected by M90×3 threads. The diaphragm 11 is clamped between the isolation nut and the gland and is pressed tightly by bolts.

[0023] When conducting experiments using a two-stage light gas gun, the muzzle section 101 of the separation cylinder 1 and the inside of the launch tube are connected. To reduce the resistance at the head of the projectile during launch, the launch tube and the muzzle section 101 of the separation cylinder 1 need to be evacuated. However, in the separation section 102, to increase the aerodynamic force for sufficient separation of the sabot and the projectile, a certain gas pressure needs to be retained. To achieve a pressure difference between the muzzle section 101 and the separation section 102, a diaphragm 11 with a thickness of dozens of micrometers and capable of withstanding a pressure difference of 1 atmospheric pressure is installed on the isolation sleeve one 6. The diaphragm 11 is made of a plastic film. After the projectile and sabot impact the plastic diaphragm in the muzzle section 101, they enter the separation section 102. The sabot generates a lateral force under the action of the aerodynamic force and gradually separates from the projectile. To simulate a vacuum environment, the target chamber is also in a vacuum state during the experiment. To maintain the air pressure in the separation section, the separation section 102 also needs to be hermetically separated from the target chamber. The flange at the right end of the separation cylinder 1 also adopts the same design as the partition plate two 9. Considering that it is not easy to replace the internal part of the flange cylinder in case of accidental impact and perforation damage by the sabot after separation, a design of sandwiching a flange for installing a screw sleeve between the flange at the right end of the separation cylinder 1 and the flange of the target chamber is adopted. The flange for installing the screw sleeve is designed with a central hole for installing the isolation sleeve two 7. The isolation sleeve two 7 is also installed with a plastic film. The sizes of the observation window one 2 and the observation window two 3 at both ends of the separation cylinder 1 are both 230mm×280mm. Among them, the center of the pair of observation window one 2 at the left end of the separation cylinder 1 is 450mm away from the left end of the separation cylinder 1, and the center of the pair of observation window two 3 at the right end is 270mm away from the right end of the separation cylinder 1. When not in use for observation, the observation window one 2 and the observation window two 3 are sealed with blind plates. The observation window flange and the right end flange are both provided with O-ring grooves and sealed with O-rings.

[0024] The main material of the separation cylinder 1 is Q235 steel, and the materials of the right end flange, the observation window flange, and the isolation sleeve are 45 steel. To evacuate the inside of the separation cylinder 1 and inject gas into the separation section, a flange with a diameter of 50mm is provided below the observation windows of the muzzle section 101 and the separation section 102, and a butterfly valve is set. After the butterfly valve is set on the flange of the separation section, an automatic gas injection and pressure measurement chamber with the same diameter is set, and another butterfly valve is equipped. Then, through a tee and a corrugated pipe, the flange of the muzzle section is connected to the vacuum flange of the target chamber. After the target chamber is evacuated, the vacuum degrees of the muzzle section and the separation section of the separation cylinder also decrease simultaneously. After the evacuation is completed, the butterfly valve of the muzzle section and the butterfly valve behind the automatic gas injection and pressure measurement chamber are closed. Then, after injecting a certain pressure of nitrogen gas into the separation section, the butterfly valve in front of the automatic gas injection and pressure measurement chamber is closed;

[0025] After the sabot and the projectile are separated, a partition plate two 9 needs to be set to block the sabot. The separation degree of the sabot and the projectile is positively correlated with the flight distance. Therefore, the partition plate two 9 is set on the right side of the separation cylinder 1, that is, on the side close to the target chamber. The separated sabot is still at ultra-high speed, and high-speed spatter will be generated after it impacts the separation baffle. The high-speed spatter is not sufficient to cause obvious damage to the steel plate but can damage the observation window. To protect the observation window, the partition plate two 9 is set on the left side of the observation window two 3, asFigure 4 as shown

[0026] In summary, the double-stage hypervelocity projectile sabot separation device provided in this embodiment, which is arranged at the tail of the launch tube of the two-stage light gas gun, effectively solves the problem that the existing system cannot both ensure the high-vacuum environment of the launch tube and the target chamber, and is convenient for magnetic velocity measurement installation without causing sabot pollution to the target chamber. This device can achieve stable separation of the projectile and the sabot, without damaging the projectile or polluting the target chamber environment.

[0027] The above description of the embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A two-stage ultra-high-speed projectile sabot separation device, characterized in that, it includes a separation cylinder (1), an observation window one (2), an observation window two (3), two sets of support seats (4), and a support platform (5). The separation cylinder (1) includes a muzzle section (101) and a separation section (102). The observation window one (2) is arranged on the muzzle section (101), and the observation window two (3) is arranged on the separation section (102). The bottom ends of the two sets of support seats (4) are fixedly connected to the support platform (5), and the top ends are connected to the separation cylinder (1). A partition plate one (13) is arranged inside the separation cylinder (1). A central hole is arranged on the partition plate one (13), and an isolation sleeve one (6) is arranged at the central hole. A clamping groove (10) is arranged inside the separation section (102), and a partition plate two (9) is arranged inside the clamping groove (10). The end of the separation section (102) is connected with a flange, and a round hole is arranged at the center of the flange. An isolation sleeve two (7) is arranged at the round hole. Diaphragms (11) are arranged inside both the isolation sleeve one (6) and the isolation sleeve two (7). O-ring sealing grooves (12) are also arranged on the outer side walls of the isolation sleeve one (6) and the isolation sleeve two (7).

2. The two-stage ultra-high-speed projectile sabot separation device according to claim 1, characterized in that, the muzzle section (101) is connected to the launch tube, and a launch tube sealing assembly (8) is arranged inside the muzzle section (101). The launch tube sealing assembly (8) is a cylindrical surface double O-ring pressurizing ring.

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