A new type of bullet support

Abstract

The present invention relates to the field of ballistic test technology, in particular to a new type of cartridge, comprising: a shell, one end of which is provided with a receiving groove for placing a projectile, the other end of which is provided with a conical bottom push, the opening of the receiving groove is provided with a wind resistance slope, the side wall of the shell is provided with a curved slit, and the slit extends along the length direction of the shell; a hollow air-closing ring, one end of which is detachably connected to the tail vertebrae, the other end of which is provided with an outwardly expanding tail skirt, a cartridge bottom recess is formed between the inner wall of the tail skirt and the conical bottom push, and a through hole is provided on the side wall of the air-closing ring. The curved slit can hinder and delay the gas in the gun barrel from passing through the slit into the receiving groove, thereby achieving a good air-closing effect, realizing the joint movement of the cartridge and the projectile in the gun barrel, and realizing the control of the cartridge speed; the use of a variety of technical means ultimately realizes that the cartridge has a controllable speed and stable launch, and the projectile has a stable target posture when it hits the target, and achieves the desired experimental results.

Description

Technical Field

[0001] The invention relates to the technical field of ballistic testing, and in particular to a novel cartridge case. Background Art

[0002] Loading the projectile to high speed to achieve high-speed impact on the target is a key technology in projectile testing research. Commonly used loading methods include two-stage light gas guns, ballistic guns, etc. The projectile is loaded by the high-pressure gas force at the bottom of the bore. The sabot is an important component for achieving loading. Its main function is to drive and guide the movement of the projectile under the action of the high-pressure gas in the bore to achieve a higher speed while ensuring that the projectile does not deflect in the bore, avoiding the occurrence of scratches, etc. At the same time, it ensures that the projectile maintains a good flight posture in the initial stage after leaving the bore, thereby improving the effectiveness of the experiment.

[0003] At present, an integrated sabot is usually used to load a projectile with a large aspect ratio. The integrated sabot structure often requires an additional sabot removal device to separate the sabot before the projectile hits the target, such as Figure 5 As shown, the cartridge case 3 and the projectile 4 in the cartridge case 3 can move along the gun barrel 2 under the action of the gun body 1, and a separator 5 is provided at the opening of the gun barrel 2. A through hole is provided on the separator 5, wherein the inner diameter of the through hole is smaller than the diameter of the cartridge case 3 and larger than the diameter of the projectile 4, thereby blocking the cartridge case 3 from passing through and realizing the separation of the cartridge case 3 and the projectile 4.

[0004] During the separation process, the sabot 3 collides with the separator 5 and breaks into pieces. The generated fragments may pass through the separator 5 and hit the same position of the target as the projectile 4, which will cause difficulties in the subsequent hit effect research. At the same time, when the sabot 3 is separated from the projectile 4, it is easy to disturb the projectile 4, and the projectile 4 will produce uncontrollable rolling and nutation, affecting the flight stability and target impact posture of the projectile 4, which will further affect the final experimental results. Summary of the invention

[0005] Aiming at the problem that the existing cartridge case is easily affected by the projectile body when being separated from the projectile body, the present invention provides a novel cartridge case.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: a new type of cartridge case, comprising:

[0007] A shell, one end of which is provided with a receiving groove for placing the elastic body, and the other end is provided with a conical bottom push, the opening of the receiving groove is provided with a wind resistance inclined surface, and the side wall of the shell is provided with a curved slit, and the slit extends along the length direction of the shell;

[0008] A hollow air-closing ring, one end of which is detachably connected to a conical bottom push, and the other end is provided with an outwardly expanding tail skirt, a spring support bottom recess is formed between the inner wall of the tail skirt and the conical bottom push, and a through hole is provided on the side wall of the air-closing ring.

[0009] The beneficial effects of the present invention are as follows: when the sabot is fired, the curved slit can hinder and delay the gas pressure in the gun barrel from passing through the slit into the receiving groove, thereby achieving a good air-locking effect and realizing the joint movement of the sabot and the projectile in the gun barrel; by setting a wind resistance inclined surface, the airflow generates a radial separation moment, that is, the radial component of the air resistance to which the sabot is subjected during flight, and the sabot is split into several parts along the slit through the radial component, thereby realizing rapid separation of the sabot and the projectile; at the same time, during the separation process, the separation angle of the sabot is large and no fine fragments are formed, so that the hitting effect of the projectile is not affected, thereby ensuring the accuracy of the final test result. By setting an outward-expanding tail skirt structure on the air-sealing ring, before firing, the air-sealing ring and the gun barrel are matched with a micro-gap. During firing, under the action of the gas from the air cannon, the tail skirt stretches out in all directions and contacts the inner wall of the gun barrel, achieving effective and controllable air sealing, thereby ensuring the stability and controllability of the sabot firing speed; the flight speed of the sabot and the projectile body can be controlled by adjusting the diameter of the through hole, ensuring that the sabot and the projectile body fly at the required speed.

[0010] On the basis of the above technical solution, in order to achieve the convenience of use and the stability of the equipment, the present invention can also make the following improvements to the above technical solution:

[0011] Furthermore, a plurality of the slits are provided, and the plurality of the slits are evenly distributed along the circumference of the shell.

[0012] The beneficial effect of adopting the above-mentioned further technical solution is to reduce the mass of the single-petal sabot relative to the projectile body, realize the rapid separation of the sabot and the projectile body, and minimize the influence of the sabot separation process on the stable flight and target impact posture of the projectile body.

[0013] Furthermore, there are four slits, and the four slits are arranged in a cross shape.

[0014] The beneficial effect of adopting the above further technical solution is that the cartridge case is split more evenly, the generation of fragments is avoided, and the processing cost is reduced.

[0015] Furthermore, the slit is in a continuous S-shape.

[0016] The beneficial effect of adopting the above-mentioned further technical solution is to increase the resistance to the flow of gas pressure in the direction of the containing groove, thereby achieving a good air-locking effect. At the same time, during the joint movement of the cartridge case and the projectile in the bore, the petals of the cartridge case are interlocked with S-shaped slits, and the relative positions of the petals remain unchanged, thereby forming a stable and continuous wrapping for the projectile, and finally creating the prerequisite for the stable target-impacting posture of the projectile.

[0017] Furthermore, the number of the through holes corresponds to the number of the slits, and the through holes are evenly distributed at the slits along the circumference of the air-closing ring.

[0018] The beneficial effect of adopting the above-mentioned further technical solution is that, by setting different numbers of through holes, the separation force of the gas-sealing ring when the petals of the cartridge case are separated can be adjusted, so that the cartridge case can be successfully separated into petals after leaving the muzzle, a good projectile hitting the target posture is obtained, and the desired experimental results are achieved.

[0019] Furthermore, the air-closing ring is connected to the conical bottom push through a thread.

[0020] The beneficial effect of adopting the above-mentioned further technical solution is that after the petals of the support are combined, they are tightened using the internal thread of the air-locking ring to ensure that the gap between the S-shaped slits of the petals of the support is minimized, thereby ensuring a good air-locking effect and further ensuring that the speed of the projectile is accurate and controllable.

[0021] Furthermore, the air-sealing ring is made of nylon.

[0022] The beneficial effect of adopting the above-mentioned further technical solution is to reduce the friction between the air-closing ring and the inner wall of the gun barrel, thereby avoiding the cartridge case from being ablated or disintegrated under pressure in the gun barrel, which may cause a firing failure.

[0023] Furthermore, the inclination angle δ of the wind resistance slope is 25°-27°.

[0024] The beneficial effect of adopting the above further technical solution is that after the cartridge case leaves the muzzle, the wind resistance slope at the front end of the cartridge case is affected by the wind resistance, thereby facilitating the separation of the petals of the cartridge case. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A half-section schematic diagram of the cartridge case of the present invention;

[0026] Figure 2 This is an appearance diagram of the bullet support of the present invention;

[0027] Figure 3 A three-dimensional diagram of the cartridge case of the present invention;

[0028] Figure 4 This is a posture diagram of the moment when the cartridge case of the present invention is separated;

[0029] Figure 5 It is a schematic diagram of the separation of the bullet support in the prior art.

[0030] The accompanying drawings are marked as follows: 1. gun body; 2. gun barrel; 3. cartridge case; 4. projectile body; 5. separator; 10. shell; 11. receiving groove; 12. slit; 13. windage slope; 14. conical bottom thrust; 20. air-closing ring; 21. through hole; 22. tail skirt; 23. cartridge case bottom recess. DETAILED DESCRIPTION

[0031] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0032] Please refer to Figures 1 to 4 A novel cartridge holder comprises: a shell 10, one end of the shell 10 is provided with a receiving groove 11 for placing a projectile, the other end is provided with a conical bottom push 14, the opening of the receiving groove 11 is provided with a wind resistance slope 13, the inclination angle δ of the wind resistance slope 13 is 25°-27°, a separation slit is provided on the side wall of the shell, the slit 12 is curved, and the slit 12 extends along the length direction of the shell 10, so that the shell 10 forms a plurality of petals;

[0033] A hollow air-closing ring 20 has one end detachably connected to the tail vertebrae 14 and the other end is provided with a tail skirt 22 that expands outwards. A spring-supporting bottom recess 23 is formed between the inner wall of the tail skirt and the conical bottom push 14. A through hole 21 is provided on the side wall of the air-closing ring 20.

[0034] The curved slit cartridge case of the present invention forms a barrier to the intrusion of the rear high-pressure launch airflow due to the interlocking advantage of the curved slits between the petals. Even if the rear launch airflow is uneven, the petals can maintain a stable relative position to stably wrap the projectile, and finally ensure the stable landing posture of the flying projectile after leaving the barrel. The problem that at the moment of launch, the high-pressure airflow is easily squeezed in along the straight slit of the cartridge case under the push of the rear launch airflow, causing the petals of the cartridge case to burn or become unstable in speed, and during the entire movement in the barrel, the relative positions between the petals cannot be maintained due to the unevenness of the rear airflow, resulting in the instability of the cartridge case in the barrel, and thus the flight posture of the projectile cannot be guaranteed after leaving the barrel, resulting in abnormal landing posture.

[0035] The outward expansion angle of the tail skirt can be adjusted according to the diameter of the housing 10, wherein the thickness of the end of the tail skirt is not less than 2 mm.

[0036] The receiving groove 11 is adapted to the size of the projectile, so as to achieve stable wrapping of the projectile and ensure that the two keep moving together before leaving the chamber.

[0037] Optionally, the shell 10 is made of aluminum alloy, and a reducing section is provided at the end of the shell 10. By installing a nylon sleeve on the reducing section, the friction of the inner wall of the barrel can be reduced and the service life of the barrel can be increased.

[0038] A plurality of slits 12 are provided, and the plurality of slits 12 are evenly distributed along the circumference of the housing 10 .

[0039] There are four slits 12, which are arranged in a cross shape. The four slits 12 divide the housing 10 into four petals.

[0040] The slit 12 is in a continuous S-shape, and may also be in a sawtooth shape, a trapezoidal shape, etc. In order to prevent damage caused by stress concentration, the slit 12 should have a smooth transition, and in order to adapt to high-speed launch conditions, its transition size shall not be less than 3 mm.

[0041] The number of the through holes 21 corresponds to the number of the slits, and the through holes are evenly distributed at the slits 12 along the circumference of the air-closing ring 20, so that the airflow can directly enter the slits 12 through the through holes 21, and the separation force of the air-closing ring 20 can be adjusted when the petals of the support are separated. That is, the number of through holes corresponds to the number of petals of the support. When the support is divided into three petals, the number of through holes is also three, and they are evenly distributed at the position of the interlocking S-shaped slits of each two petals of the support. By setting the through holes at the interlocking positions of the petals, the petals affected by wind resistance are evenly separated at the prefabricated through hole positions, ensuring that the impact on the flight posture of the projectile when the petals of the support are separated is minimized, and ensuring that the flying projectile has a good landing posture.

[0042] For fragmentation tests with sabots with a diameter less than 14 mm, the number of sabot petals is preferably 4 for ease of processing. When conducting fragmentation tests with sabots of larger calibers, the number of petals can be appropriately increased to meet the need for larger fragments to land stably on the target.

[0043] The diameter of the through hole is determined by the expected projectile speed. For example, when the test speed of the projectile fragment launch is 280m / s-580m / s, the ratio of the through hole diameter to the cross-sectional width of the air-sealing ring 20 where the through hole is located is greater than or equal to 0.8. The wall thickness of the air-sealing ring is determined according to the tooth height of the internal thread of the air-sealing ring. Depending on the processing conditions, the smaller the value, the better, thereby ensuring the normal separation of each petal and allowing the projectile to maintain a good posture to hit the target.

[0044] The gas-sealing ring 20 is connected to the conical bottom push 14 through a thread, so that the gas-sealing ring 20 with different through-hole diameters can be easily replaced according to the fragment test speed, thereby increasing the versatility of the housing 10 and reducing the processing cost.

[0045] The material of the air-closing ring 20 is nylon.

[0046] The processing of the present invention is as follows:

[0047] Step 1:

[0048] Material selection: According to processing requirements, aluminum alloy and other materials with certain strength and low density are generally selected as the cartridge case material to reduce the weight of the cartridge case and make it easy to separate from the test projectile after leaving the chamber.

[0049] Step 2:

[0050] Structural design: The cartridge case is designed according to the caliber of the launch device, wherein the cartridge case is cylindrical as a whole, and the shell front cavity and the adjustable air-closing ring 20 are designed according to the experimental projectile size and the launch speed requirements.

[0051] Step 3:

[0052] Processing requirements: Use aluminum alloy rods, first process all external dimensions, then cross-line divide the bullet holder with the central axis, the dividing surface is an S-shaped intermeshing slit 12, the adjustable air-sealing ring 20 is processed at the tail end with nylon rods, then the internal thread is processed, and finally the receiving groove 11 in the shell 10 is processed.

[0053] In summary, the cartridge case is subjected to the thrust of the propellant or high-pressure airflow in the bore, and the combined effect of the air-closing ring with the tail skirt and the mutual meshing of the S-shaped slits 12 between the petals of the cartridge case causes the cartridge case to wrap the experimental projectile and move together in the bore or barrel; at the moment when the cartridge case exits the muzzle, the enclosed airflow in the bore is instantly released, and the strong airflow generated will disturb the cartridge case, while the force-bearing area of ​​the conical bottom thrust 14 is small, and the muzzle airflow at the rear of the cartridge case passes quickly along the conical outer surface, forming a certain degree of holding effect on the tail of the cartridge case, ensuring that the cartridge case as a whole will not deflect, creating conditions for subsequent stable separation outside the bore; after exiting the muzzle, the wind resistance inclined surface 13 of the cartridge case is subjected to external windward resistance, and under the action of the separation torque, the cartridge case slit 12 expands from the front end of the cartridge case to the bottom of the cartridge case until the air-closing ring 20 breaks at more than one point, and the petals of the cartridge case form a separation angle and fly around, realizing the rapid separation of the cartridge case and the projectile, and the experimental projectile continues to fly until it lands on the target with a stable landing posture.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A new type of cartridge, characterized in that: include: A housing, wherein one end of the housing is provided with a receiving groove for placing the elastic body, and the other end is provided with a conical bottom push, a wind resistance inclined surface is provided at the opening of the receiving groove, and the inclination angle δ of the wind resistance inclined surface is 25°-27°, a curved slit is provided on the side wall of the housing, and the slit extends along the length direction of the housing, and a plurality of the slits are provided, and the plurality of the slits are evenly distributed along the circumference of the housing, and the slits are in a continuous S shape; A hollow air-closing ring, one end of which is detachably connected to a conical bottom push through an internal thread, and the other end is provided with an outwardly expanding tail skirt, a spring-support bottom recess is formed between the inner wall of the tail skirt and the conical bottom push, and through holes are provided on the side wall of the air-closing ring, the number of the through holes corresponds to the number of the slits, and the through holes are evenly distributed at the slits along the circumference of the air-closing ring.

2. The novel cartridge according to claim 1 is characterized in that: There are four slits, and the four slits are arranged in a cross shape.

3. The novel cartridge according to claim 1 is characterized in that: The material of the air-closing ring is nylon.

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