Two-stage pneumatic shelling device with parallel shafts arranged eccentrically

Abstract

The invention belongs to the field of impact dynamics, and particularly relates to a two-stage pneumatic shelling device with parallel shafts eccentrically arranged. Comprising a connecting section connected with a gun barrel, the connecting section is connected with one end of a sabot recycling cabin body through a sealing device, and a shelling mechanism is arranged in the sabot recycling cabin body; the shelling mechanism comprises a first-stage shelling baffle and a second-stage shelling baffle which are arranged along the axis of the trajectory, and a round hole in the middle of the first-stage shelling baffle is eccentrically arranged, so that shock waves only generate acting force and moment on the bottom support after being reflected on the inner wall face of the first-stage shelling baffle, the projectile body is not stressed or moment, and the posture of the projectile body is not changed, and the bottom support deviates. After shelling is conducted through the non-concentric secondary baffle shelling device, complete shelling of the sabot can be achieved, and no residual sabot touches a target; the unshelling device has little influence on the flight attitude of the projectile body and does not influence the test result.

Description

Technical Field

[0001] The invention belongs to the field of impact dynamics, and in particular relates to a two-stage pneumatic shelling device with eccentrically arranged parallel axes. Background Art

[0002] The two-stage light gas gun is a universal launching device with a wide range of applicability to the material, shape and quality of the projectile. It is widely used in the field of high-speed and ultra-high-speed test research. When launching a metal projectile, in order to protect the inner bore of the gas gun launch tube, a plastic sabot that can wrap the projectile must be used. The outer diameter of the sabot is basically the same as the inner caliber of the launch tube. The sabot carries the projectile at high speed and shoots it toward the target. In the light gas gun high-speed / ultra-high-speed collision test, the sabot will affect the cratering effect of the target and the particle velocity test results. In order to avoid the interference of the sabot itself on the test, it is necessary to try to separate the sabot from the projectile.

[0003] At present, the commonly used shelling methods are mainly divided into pneumatic shelling and mechanical shelling. Mechanical shelling separates the shell and the projectile through direct mechanical action between the external shelling device and the shell. However, this shelling method will inevitably result in a small amount of shell hitting the target, affecting the experimental results. The shell used in pneumatic shelling is a flap type, consisting of multiple flaps and a bottom support. There are usually 3-4 flaps, such as Figure 1 As shown. During high-speed flight, the flap-type sabot will be separated from the projectile under the combined effect of the shock wave at the launch tube exit and the surrounding flow field, allowing only the projectile to pass through the sabot baffle. However, the existing pneumatic saboting method usually has the phenomenon that the sabot also passes through the baffle and hits the target, which seriously affects the test results. Summary of the invention

[0004] Aiming at the defect that the current shelling device cannot completely shell the cartridge case, especially the problem of the base hitting the target in the pneumatic shelling method, the present invention provides a pneumatic shelling device with two-stage baffles of eccentric arrangement. The impact baffle of the present invention has a simple structure, is easy to process, and is convenient to disassemble, and can adapt to projectiles of various diameters; through the eccentric arrangement, the base deflection is achieved while ensuring the posture of the projectile; after the two-stage shelling, the shelling can be completely removed without any residual cartridge hitting the target; the shelling device has little effect on the flight posture of the projectile and does not affect the test result.

[0005] The technical solution to achieve the purpose of the present invention is: a two-stage pneumatic shelling device with parallel shafts arranged eccentrically, including a connecting section connected to the gun barrel, the connecting section is connected to one end of the sabot recovery cabin body through a sealing device, and the sabot recovery cabin body is provided with a shelling mechanism;

[0006] The shelling mechanism includes a primary shelling baffle and a secondary shelling baffle arranged along the ballistic axis. The circular hole in the middle of the primary shelling baffle is eccentrically arranged so that the shock wave only generates force and torque on the bottom support after being reflected by the inner wall surface of the primary shelling baffle, and the projectile is not subjected to force and torque, so that the posture of the projectile remains unchanged and the bottom support deviates.

[0007] Furthermore, a flange flange is provided at the end of the connecting section, and a plurality of threaded holes are evenly distributed around the flange flange; a plurality of threaded holes are evenly distributed around the outer periphery of the sealing device; a flange flange is provided at the connecting end of the support recovery cabin body and the sealing device, and a plurality of threaded holes are evenly distributed around the flange flange; the flange flange of the connecting section, the sealing device and the flange flange of the support recovery cabin body are connected by bolts.

[0008] Furthermore, a diaphragm is provided in the middle of the sealing device, and a circular hole with a diameter greater than the outer diameter of the cartridge case for the bullet to pass through is provided in the middle of the diaphragm.

[0009] Furthermore, the connecting section, the sealing device, the cartridge recovery compartment body and the shell ejection mechanism are coaxially assembled.

[0010] Furthermore, the main body of the cartridge recovery cabin is cylindrical in shape as a whole, and a projectile flight speed measurement window and a projectile flight attitude observation window are provided on the side wall.

[0011] Furthermore, the shelling mechanism also includes a hollow cylindrical body and a shelling mechanism fixture;

[0012] The two ends of the cylinder body are detachably connected with a primary shelling baffle and a secondary shelling baffle, and the primary shelling baffle and the secondary shelling baffle are replaced according to different projectiles.

[0013] Furthermore, the shelling mechanism fixture is a rib plate arranged at the front and rear outer ends of the cylinder body, the other end of the rib plate is fixedly connected to the inner wall surface of the shell recovery cabin body, and a fragment protection ring is provided on the outer periphery of the first-stage shelling baffle of the cylinder body.

[0014] Furthermore, the eccentricity of the circular hole in the middle of the first-stage shelling baffle is determined according to experiments or simulations.

[0015] Furthermore, when the position and shape of the circular hole of the first-stage discarding sabot baffle are set according to the simulation, specifically: according to the flight speed of the projectile and based on the numerical calculation results of the shock wave flow field by Fluent, the baffle thickness, the offset distance between the circular hole axis and the ballistic axis, and the circular hole diameter of the first-stage discarding sabot baffle are designed, so that the shock wave only generates force and torque on the base after being reflected by the wall of the hole, but the projectile is not subjected to force and torque, thereby ensuring that the posture of the projectile remains unchanged, and only the base deviates.

[0016] A method for shelling based on the above-mentioned two-stage pneumatic shelling device is as follows:

[0017] The projectile with the sabot passes through the diaphragm and enters the sabot recovery cabin. The sabot's clip is separated from the projectile by the combined effect of the shock wave at the barrel exit and the surrounding flow field.

[0018] The projectile with the bottom support enters the circular hole of the first-stage shelling baffle, and the projectile with the bottom support and the first-stage shelling baffle generate shock waves. After the shock waves are reflected on the wall of the hole, they only generate force and torque on the bottom support, but the projectile is not subjected to force and torque, thereby ensuring that the posture of the projectile remains unchanged, and only the bottom support deviates;

[0019] Because the base support deviates from the axis, it is recovered by the secondary discarding baffle. The projectile continues to fly along the ballistic axis, passes through the secondary discarding baffle and leaves the discarding device. At the same time, the fragments produced by the flap and the primary discarding baffle are also recovered by the secondary discarding baffle, thereby realizing the complete discarding of the combined support.

[0020] Compared with the prior art, the present invention has the following significant advantages:

[0021] 1. Only by replacing the shelling baffle can it adapt to various diameters of projectiles, and the shelling baffle is very convenient to disassemble and replace.

[0022] 2. After shelling by the non-concentric two-stage baffle shelling device of the present invention, the sabot can be completely shelled without any residual sabot hitting the target.

[0023] 3. The shell removal device involved in this invention has little effect on the flight posture of the projectile and does not affect the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a real picture of the flap-type discarding sabot cartridge case.

[0025] Figure 2 It is the design calculation diagram of the first-stage shelling baffle of the present invention.

[0026] Figure 3 It is a three-dimensional diagram of the shelling device of the present invention.

[0027] Figure 4 It is a cross-sectional view of the shelling device of the present invention.

[0028] Figure 5 Partial physical picture of the first-stage shelling baffle of the shelling device.

[0029] Description of reference numerals:

[0030] 1-gun barrel, 2-connecting section, 3-sealing device, 4-diaphragm, 5-shell recovery cabin body, 6-projectile posture observation window, 7-shell ejection mechanism holder, 8-first-stage shell ejection baffle, 9-second-stage shell ejection baffle, 10-fragment protection baffle ring, 11-shell ejection mechanism, 12-end large flange. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0032] like Figure 1-5 As shown, a two-stage baffle pneumatic shelling device with non-concentric arrangement includes: a connecting section 2 and a sealing device 3 coaxially arranged on the outside of the outlet end of a gun barrel 1, wherein the center of the sealing device 3 is a diaphragm 4, and the diameter of the diaphragm 4 is larger than the outer diameter of the cartridge case.

[0033] The connecting section 2, the sealing device 3 and the sabot recovery cabin body 5 are connected by bolts, the sabot extraction mechanism fixture 7 of the sabot extraction mechanism 11 is connected to the sabot recovery cabin body 5 by welding, and the connecting section 2, the sealing device 3, the sabot recovery cabin body 5 and the sabot extraction mechanism 11 are coaxially assembled. The sabot recovery cabin body 5 is cylindrical, and a projectile flight speed measurement window and a projectile flight attitude observation window are arranged on it.

[0034] The first-stage deshelling baffle 8 and the second-stage deshelling baffle 9 are respectively installed by bolts on the front and rear sides of the deshelling mechanism 11, which is convenient for disassembly and replacement. Among them, the first-stage deshelling baffle 8 is eccentrically arranged with a circular hole to recover the support flap, ensuring that the projectile passes through while inducing the deflection of the bottom support; the second-stage deshelling baffle 9 is centrally arranged with a circular hole for recovering the flap fragments and the bottom support.

[0035] The diameter of the diaphragm 4 is larger than the outer diameter of the sabot, so that both the projectile and the sabot can smoothly enter the interior of the sabot recovery cabin body 5. Since there is air at a certain pressure (atmospheric pressure) inside the recovery cabin, the high-speed running flap part will be separated from the projectile under the combined action of the shock wave at the exit of the launch tube, i.e., the gun barrel 1, and the surrounding flow field, so that only the projectile and the base can smoothly enter the circular hole of the first-stage shelling baffle 8, and the flap part in the sabot will collide with the first-stage shelling baffle 8 and be intercepted.

[0036] When the base and the projectile enter the circular hole of the first-stage shelling baffle 8 together, the projectile and the base will generate shock waves with the first-stage shelling baffle 8. Combined with the flight speed and length of the projectile required by the experiment, the shock wave flow field is numerically calculated based on the flow field analysis software Fluent, and the spatial distribution of the shock wave system can be obtained. The three quantities of the baffle thickness, the offset distance between the circular hole axis and the trajectory axis, and the circular hole diameter are designed so that the shock wave only generates force and torque on the base after being reflected by the hole wall, while the projectile is not subjected to force and torque, thereby ensuring that the posture of the projectile remains unchanged, and only the base deviates (such as Figure 2 After the projectile and the base pass through the primary shelling baffle 8, the projectile continues to fly along the ballistic axis and leaves the shelling device. The base deviates from the axis due to its posture and is recovered by the secondary shelling baffle 9. At the same time, the fragments generated by the card flap and the primary shelling baffle 8 are also recovered by the secondary shelling baffle 9 at this stage, thereby achieving complete shelling of the combined shell.

[0037] The main body of the shelling mechanism is a hollow thin-walled cylinder.

[0038] The sabot recovery compartment body 5 and the components connected thereto by bolts have N screw holes in a circular array centered on the central axis, which facilitates the disassembly and replacement of each connection part.

[0039] The cylindrical body of the shelling mechanism is connected to the shelling baffle by bolts, and both have N screw holes in a circular array centered on the central axis. In this way, when the shelling section is damaged or a different model is replaced according to the need of the projectile, it is convenient to replace the shelling section and reduce the use cost.

[0040] The shelling baffle is a consumable material, and cheap materials such as No. 20 steel, No. 45 steel, etc. can be used to reduce the experimental cost.

[0041] The main body of the sabot recovery cabin is equipped with observation windows for flight speed and flight attitude, as well as an optical fiber channel for particle flight speed, to facilitate various subsequent measurements.

[0042] The device can be applied in fields such as material science, impact dynamics, weapons science and protective engineering.

Claims

1. A two-stage pneumatic shelling device with eccentric arrangement of parallel axes, characterized in that: It comprises a connecting section (2) connected to a gun barrel (1), the connecting section (2) being connected to one end of a sabot recovery cabin body (5) via a sealing device (3), and a shell ejection mechanism (11) is arranged inside the sabot recovery cabin body (5); The shelling mechanism (11) comprises a primary shelling baffle (8) and a secondary shelling baffle (9) arranged along the trajectory axis. The circular hole in the middle of the primary shelling baffle (8) is eccentrically arranged so that the shock wave only generates force and torque on the bottom support after being reflected by the inner wall surface of the primary shelling baffle, and the projectile is not subjected to force and torque, so that the posture of the projectile remains unchanged and the bottom support deviates.

2. The two-stage pneumatic shelling device according to claim 1 is characterized in that: The end of the connecting section (2) is provided with a flange flange, and a plurality of threaded holes are evenly distributed around the flange flange; the outer circumference of the sealing device (3) is evenly distributed with a plurality of threaded holes; the connecting end of the cartridge recovery cabin body (5) and the sealing device (3) is provided with a flange flange, and a plurality of threaded holes are evenly distributed around the flange flange; the flange flange of the connecting section, the sealing device and the flange flange of the cartridge recovery cabin body (5) are connected by bolts.

3. The two-stage pneumatic shelling device according to claim 1 is characterized in that: A diaphragm (4) is provided in the middle of the sealing device (3), and a circular hole with a diameter greater than the outer diameter of the cartridge case and for the bullet to pass through is provided in the middle of the diaphragm (4).

4. The two-stage pneumatic shelling device according to claim 1 is characterized in that: The connecting section (2), the sealing device (3), the cartridge recovery compartment body (4) and the shell ejection mechanism (11) are coaxially assembled.

5. The two-stage pneumatic shelling device according to claim 1 is characterized in that: The main body (5) of the sabot recovery cabin is cylindrical in shape as a whole, and a projectile flight speed measurement window and a projectile flight attitude observation window are arranged on the side wall surface.

6. The two-stage pneumatic shelling device according to claim 1 is characterized in that: The shelling mechanism (11) further comprises a hollow cylindrical body and a shelling mechanism fixture (7); A primary shelling baffle (8) and a secondary shelling baffle (9) are detachably connected at both ends of the cylinder body. The primary shelling baffle (8) and the secondary shelling baffle (9) are replaced according to different projectiles.

7. The two-stage pneumatic shelling device according to claim 6 is characterized in that: The shelling mechanism fixer (7) is a rib plate arranged at the front and rear outer ends of the cylindrical body, and the other end of the rib plate is fixedly connected to the inner wall surface of the cartridge recovery cabin body (5). A fragment protection baffle ring (10) is arranged on the outer periphery of the first-stage shelling baffle of the cylindrical body.

8. The two-stage pneumatic shelling device according to claim 1 is characterized in that: The eccentric setting of the circular hole in the middle of the first-stage shelling baffle (8) is determined based on experiments or simulations.

9. The two-stage pneumatic shelling device according to claim 8, characterized in that: When the position and shape of the circular hole of the first-stage discarding sabot baffle are set according to the simulation, specifically: according to the flight speed of the projectile, based on the numerical calculation results of the shock wave flow field by the fluent analysis software Fluent, the baffle thickness of the first-stage discarding sabot baffle, the offset distance between the circular hole axis and the ballistic axis, and the circular hole diameter are designed, so that the shock wave only generates force and torque on the bottom support after being reflected on the wall of the hole, but the projectile is not subjected to force and torque, thereby ensuring that the posture of the projectile remains unchanged, and only the bottom support deviates.

10. A method for shelling based on the two-stage pneumatic shelling device according to any one of claims 1 to 9, characterized in that: The details are as follows: The projectile with the sabot passes through the diaphragm and enters the sabot recovery cabin. The sabot's clip is separated from the projectile by the combined effect of the shock wave at the barrel exit and the surrounding flow field. The projectile with the bottom support enters the circular hole of the first-stage shelling baffle, and the projectile with the bottom support and the first-stage shelling baffle generate shock waves. After the shock waves are reflected on the wall of the hole, they only generate force and torque on the bottom support, but the projectile is not subjected to force and torque, thereby ensuring that the posture of the projectile remains unchanged, and only the bottom support deviates; Because the base support deviates from the axis, it is recovered by the secondary discarding baffle. The projectile continues to fly along the ballistic axis, passes through the secondary discarding baffle and leaves the discarding device. At the same time, the fragments produced by the flap and the primary discarding baffle are also recovered by the secondary discarding baffle, thereby realizing the complete discarding of the combined support.

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