Prefabricated fragment type 14.5 mm bullet

Abstract

The invention discloses a prefabricated fragment type 14.5 mm bullet, and belongs to the technical field of unmanned aerial vehicle defense. The bullet comprises a bullet head and a bullet body, shells are arranged outside the bullet head and the bullet body, a charging and communication interface, a control circuit and an overload switch are arranged inside the shell of the bullet head, one end of the charging and communication interface is connected with the control circuit, and the control circuit is connected with the overload switch; a throwing device is arranged in the projectile body shell, and a U-shaped groove is formed in the outer wall of the throwing device and used for assembling the prefabricated fragments; a groove is formed in one end of the throwing device, and a fuel gas generator is installed in the groove. According to the bullet, the fragments are prefabricated in the bullet, gas power is generated through gas generation to throw the prefabricated fragments from the bullet, explosive and a detonator do not need to be arranged in the bullet, and therefore the mode that the prefabricated fragments are thrown through the detonator explosive is replaced, and the safety performance of the bullet in the production, transportation, storage and use processes is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of unmanned aerial vehicle defense, and in particular relates to a prefabricated fragmentation type 14.5 mm bullet. Background Art

[0002] With the rapid development and increasing maturity of unmanned aerial vehicle (UAV) technology, their use is becoming increasingly widespread. However, at the same time, the security concerns raised by UAVs are becoming increasingly prominent. In particular, drone swarms (autonomous flying groups consisting of multiple drones) are capable of performing reconnaissance, jamming, and even strike missions, posing a new threat to critical facilities and military targets. Drone swarms, characterized by their large numbers, small size, and high mobility, often make traditional defenses ineffective.

[0003] Currently, due to the large number and flexibility of swarm drones, traditional defense methods are difficult to deal with. Using machine guns to fire bullets to defend against drones is an effective means. However, the mass of ordinary bullets is concentrated in the warhead, and when hitting the target, it only relies on the kinetic energy of a single point to damage the target, which has a low probability of damaging drones, especially small drones. To improve the damage efficiency, one idea is to prefabricate a large number of fragments (such as steel balls, tungsten balls, etc.) inside the bullet. When the bullet flies near the target, the fragments are ejected, forming a scattered fragment group, thereby greatly increasing the probability of hitting the drone. However, how to reliably achieve the dispersion of fragments in small-caliber bullets is a technical challenge.

[0004] Traditional fragment dispersion methods typically use explosive detonation, using a detonator to detonate the explosive, blasting the projectile apart and ejecting fragments. This method has been used in larger caliber ammunition (e.g., grenades larger than 20mm). However, for small-caliber machine gun rounds like 14.5mm, using explosive dispersion to disperse fragments faces numerous challenges: First, the 14.5mm bullet is extremely small, with limited internal space, making it difficult to accommodate traditional components such as the fuze, detonator, and explosives while maintaining a sufficient safety distance. Second, the bullet experiences extreme overload during firing (up to tens of thousands of g) and rotates at high speeds during flight, placing extremely high demands on the safety and reliability of the fuze. Furthermore, to prevent accidental explosions, ammunition typically requires a flameproofing device (e.g., a safety mechanism between the detonator and the explosive), but achieving reliable flameproofing in such a confined space is nearly impossible. Therefore, existing technologies for integrating prefabricated fragmentation warheads into small-caliber ammunition face bottlenecks, making traditional explosive dispersion solutions difficult to implement on 14.5mm rounds. Summary of the Invention

[0005] The present invention aims to address the aforementioned issues by providing a prefabricated fragmentation 14.5mm bullet. This is intended to improve existing bullets, which, due to their small size, cannot reliably integrate all necessary fuse components that meet stringent safety standards, and whose explosion-proof devices struggle to meet safety and reliability requirements. Specifically, the present invention aims to achieve the dispersal of prefabricated fragments within a 14.5mm machine gun bullet while avoiding the use of explosives and detonators, thereby improving the safety and reliability of the ammunition and enhancing the efficiency of intercepting drone swarms.

[0006] The technical solution adopted by the present invention is as follows: a prefabricated fragmentation type 14.5 mm bullet, the bullet comprising a warhead and a body, both of which are provided with a shell;

[0007] The warhead housing is equipped with a charging and communication interface, a control circuit and an overload switch. One end of the charging and communication interface is connected to the control circuit, which is connected to the overload switch; the ignition output end of the control circuit is connected to the gas generator;

[0008] A spreading device is provided inside the shell of the projectile, and a U-shaped groove is provided on the outer wall of the spreading device for assembling prefabricated fragments; a groove is provided at one end of the spreading device, and a gas generator is installed in the groove;

[0009] One end of the spreading device connected to the bullet is provided with a thread, and the spreading device is connected to the bullet through the thread.

[0010] It should be noted that the gas generator can be installed between the warhead and the dispensing device. The gas generator generates pressure to push the dispensing device backward, which can also achieve the effect of the technical solution of the present invention. The overload switch can use an accelerometer or other type of overload switch that can sense the overload of the bullet and output an on-off signal or level signal that can be recognized by the processor. The prefabricated fragments can be replaced by black beads, black columns, black steel balls, black steel columns, or steel columns. The beads are sized from φ1mm to φ5mm, the columns are sized from φ1mm to φ5mm, and the height is 1mm to 5mm. The dispensing device and the warhead can also be connected by a stable method such as adhesive. There are 8 grooves, each of which is equipped with 7 beads, for a total of 56. The grooves can be of other sizes and quantities.

[0011] Furthermore, in order to insulate the warhead casing from the two input lines of the control circuit bus, the charging and communication interface includes an insulating sleeve and a round-head probe. A through hole is provided in the middle of the insulating sleeve. One end of the round-head probe passes through the through hole of the insulating sleeve. The insulating sleeve contacts the warhead casing, and the other end of the round-head probe is connected to the input port of the control circuit PCB. The other input port of the control circuit PCB board is connected to the warhead casing; the insulating sleeve is used to insulate the round-head probe from the warhead casing.

[0012] Furthermore, the gas generator is provided with a shell on the outside, and the gas generator includes an electrode plug, a bridge wire and a gas generating agent inside; the electrode plug pin is connected to the ignition output welding pad of the control circuit PCB board; the gas generating agent is installed in the gas generator shell and contacts the bridge wire.

[0013] It should be noted that bridge wire can also use bridge film, whose resistance value is 0.5Ω-5Ω.

[0014] Furthermore, in order to ensure that the spreading device is reliably fixed in normal times and can be smoothly separated when needed, corresponding holes are provided on the spreading device and the projectile shell. Pins connect the spreading device to the bullet shell through the holes, and the pins are used to limit the rotation and forward and backward movement of the spreading device.

[0015] It should be noted that the connection between the spreading device and the projectile shell needs to meet the requirement of limiting the spreading device when the gas generator is not working. When the gas generator is working, the pin is broken by the thrust of the gas pressure, thereby completing the throwing of the spreading device.

[0016] Furthermore, in order to facilitate the connection between the gas generator and various devices in the bullet, the spreading device is provided with a central through hole, and the central through hole is used to pass the wire; after the gas generator is installed, the central through hole is sealed.

[0017] Furthermore, in order to prevent gas leakage, a sealing ring is provided on the sprinkling device, and the sealing ring is used to seal the gas and seal the gas inside the sprinkling device.

[0018] Furthermore, the control circuit includes a fixing bracket and a PCB board, the PCB board is fixed on the fixing bracket, and the control circuit is sealed in the warhead shell by sealing glue.

[0019] Furthermore, the PCB board includes a controller, an overload switch, a communication circuit, a secondary power supply circuit and a gas generator. The overload switch controls the startup of the controller, and the controller is connected to the gas generator and the communication circuit; the communication circuit includes a communication drive power supply, which is used to provide power for communication between the PCB board and the bullet; the controller is connected to the bullet through two non-polarity buses, which is used to delay the stapling of the bullet and transmit electrical energy; the secondary power supply circuit is used to provide secondary power to the bullet after the controller is disconnected from the bullet.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0021] 1. The present invention prefabricates fragments inside the bullet and utilizes gas generator to generate gas power to scatter the prefabricated fragments (such as steel balls, steel columns, etc.) from the bullet. This eliminates the need for explosives and detonators in the bullet, thereby replacing the method of scattering prefabricated fragments with detonators and explosives. This greatly improves the safety of the bullet during production, transportation, storage, and use.

[0022] 2. The bullet of the present invention does not have an explosion-proof device inside, which simplifies the structure and improves reliability, making it adaptable to the 14.5 mm bullet size. This also means that the bullet can be directly fired using existing 14.5 mm machine guns and ammunition feed systems without making major overall changes, thus making the bullet highly compatible and practical.

[0023] 3. A large number of fragments are prefabricated inside the bullet of the present invention, which form a fragment cluster after being thrown near the target, significantly increasing the probability of hitting the target. Compared with the single-point killing of ordinary bullets, the bullet of the present invention can cover a certain area in a "surface killing" manner, which is particularly suitable for dealing with multi-target drone swarms. A large number of high-speed fragments hit the key parts of the drone (such as the power system and control circuit), which can make it lose its flight ability, thereby improving the interception success rate;

[0024] 4. This invention utilizes an electronic control circuit to achieve delayed fragmentation, allowing precise control of the timing and location of fragment release based on target distance and trajectory parameters. Fragments are released only when the bullet reaches the target, preventing premature dispersion and the resulting energy dispersion and accidental injuries. Furthermore, the control circuit incorporates a safety lockout feature, ensuring that fragmentation is not initiated until the bullet has passed a safe distance after launch, enhancing operational safety.

[0025] 5. Because the present invention does not use explosives, the bullet is less affected by factors such as ambient temperature and humidity, has a longer shelf life, and is easier to handle. Furthermore, the gas generator produces high-pressure gas rather than explosive shock waves. Therefore, when used in sensitive environments such as cities, it has minimal collateral damage and is less likely to cause additional harm to surrounding personnel and facilities, thus providing a higher level of safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the internal structure of the bullet of the present invention;

[0027] Figure 2 This is a schematic diagram of the charging and communication interface structure of the present invention;

[0028] Figure 3 A schematic diagram of the thread structure connecting the dispensing device and the bullet of the present invention;

[0029] Figure 4 It is a schematic diagram of the working principle of the PCB board of the present invention.

[0030] Figure numerals: 1. Warhead casing; 2. Projectile body casing; 3. Charging and communication interface; 31. Insulation sleeve; 32. Round head probe; 4. Control circuit; 5. Overload switch; 6. U-shaped groove; 7. Prefabricated fragments; 8. Gas generator; 9. Sealing ring; 10. Pin. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to the accompanying drawings.

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] Existing technology is unable to develop a miniature fuze system capable of withstanding the extreme environmental conditions of massive launch overloads, high-speed rotation, and flight within the extremely limited space of a machine gun bullet (diameter <20mm), while simultaneously meeting stringent safety standards (preventing accidental premature detonation) and initiation reliability requirements (ensuring precise detonation within the target area). The existing minimum fuze size exceeds the bullet diameter, and its key components (particularly the explosion-proof device) face insurmountable technical bottlenecks in miniaturization and extreme environmental resistance. This makes this technical solution extremely risky and unfeasible for engineering implementation.

[0034] The present invention provides a 14.5mm prefabricated fragment bullet. By prefabricating fragments (black beads, black columns, black steel balls, black steel columns, steel balls or steel columns) inside the bullet, the prefabricated fragments 7 or steel columns are thrown from the bullet using gas power. No detonator explosives or explosion-proof devices are required. Instead of using detonators and explosives to throw the prefabricated fragments, the 14.5mm bullet prefabricated fragments can achieve good effects in striking drone swarms.

[0035] The 14.5mm pre-fragmented bullet of the present invention is mainly used for anti-UAV swarm warfare and is suitable for various scenarios requiring the interception of low-altitude, low-speed, and small UAVs. Specific application scenarios include but are not limited to:

[0036] Key point air defense: Deployed around important facilities such as airports, ports, command centers, and transportation hubs, the bullets of this invention are fired from 14.5mm anti-aircraft machine guns or vehicle-mounted machine guns to form a dense barrage of bullets, intercept incoming drone swarms, and protect the safety of key areas.

[0037] Field Air Defense: Equipped in field troops as a supplement to short-range air defense firepower, it is used to intercept enemy reconnaissance drones, suicide drones or swarm attacks, and provide low-altitude protection for ground troops and armored clusters.

[0038] Border and VIP Protection: During border patrol or VIP escort missions, this bullet can be used to quickly shoot down approaching suspicious drones, preventing them from conducting reconnaissance or launching attacks, thereby improving mission safety.

[0039] Counterterrorism and Emergency Response: During urban counterterrorism operations or emergencies, if terrorists are using drones for interference or attack, the bullets described in this invention can be used to shoot them down from a distance, preventing further harm. Because fragments gradually decelerate as they travel through the air, the risk of collateral damage is relatively manageable, making it suitable for use in crowded areas.

[0040] The 14.5mm pre-fragmented bullet of the present invention can also be used to deal with other light targets, such as small, low-flying aircraft, lightly armored ground vehicles, or clustered living targets, by adjusting parameters according to combat needs. The core concept is still applicable: increasing target coverage and damage probability by dispersing a large number of fragments.

[0041] Example 1

[0042] Existing technology requires a complex built-in fuze system (including detonators, explosives, pyrotechnics, explosion-proof devices, timing / ranging logic) and a prefabricated fragmentation warhead. However, existing technology cannot reliably integrate all the necessary fuze components that meet stringent safety standards in such a small space. This means that the bullet caliber itself is smaller than the minimum required fuze size, making the solution physically unfeasible.

[0043] like Figure 1-Figure 3 As shown, a prefabricated fragmentation type 14.5 mm bullet includes a warhead and a body. Both the warhead and the body are provided with a shell. A charging and communication interface 3, a control circuit 4, and an overload switch 5 are provided inside the warhead shell 1. One end of the charging and communication interface 3 is connected to the control circuit 4, which is connected to the overload switch 5. The ignition output end of the control circuit 4 is connected to the gas generator 8.

[0044] The charging and communication interface 3 is used to connect to external equipment before the bullet is fired. On the one hand, it charges the circuit and power supply inside the bullet, and on the other hand, it binds parameters such as delay time through a wired manner.

[0045] The control circuit 4 is the core electronic module of the bullet, which is used to receive and process signals and trigger the fragmentation dispersion action at the appropriate time.

[0046] The overload switch 5 is used to sense the high overload impact when the bullet is fired. When the bullet is fired and the acceleration exceeds a predetermined threshold, the overload switch 5 is closed, starting the timing or triggering logic of the control circuit 4.

[0047] The ignition output terminal of the control circuit 4 is connected to the gas generator 8 in the bomb body, and is used to send an ignition signal to the gas generator 8 when the set delay time is reached, so that it starts working.

[0048] A spraying device is provided inside the projectile shell 2, and a U-shaped groove 6 is provided on the outer wall of the spraying device. There are several U-shaped grooves 6 for assembling prefabricated fragments 7; a groove is provided on one end of the spraying device facing the warhead, and a gas generator 8 is installed in the groove;

[0049] The gas generator 8 is a non-explosive power device, typically containing a gas-producing agent (propellant) and an ignition element (such as a bridge wire or bridge membrane). When the control circuit 4 issues an ignition command, the bridge wire of the gas generator 8 is energized and heated, igniting the gas-producing agent and rapidly generating a large amount of high-pressure gas. The dispersing device is connected to the bullet via a threaded connection. When the gas generator 8 is not activated, the dispersing device is also fixed to the projectile housing 2 via a limiting mechanism such as a pin 10 to restrict its rotation and forward and backward movement. When the high-pressure gas generated by the gas generator 8 acts on the dispersing device, the huge thrust causes the connecting pin 10 to break. The dispersing device, driven by the gas pressure, moves backward relative to the projectile housing 2, thereby ejecting fragments such as the pre-installed prefabricated fragments 7 from the U-shaped groove 6. Because the bullet rotates at high speed during flight, the released fragments will scatter in all directions under the action of centrifugal force, forming a dispersed fragment cluster covering a large spatial range.

[0050] One end of the spreading device connected to the bullet is provided with a thread, and the spreading device is connected to the bullet through the thread.

[0051] The bullet stapling process involves a stapling device charging the bullets in the magazine (or belt or box). Using a delay time specified by the fire control system, the stapling circuit within the magazine quickly stapling the bullets to be fired. The stapling delay is calculated based on the average muzzle velocity (or the real-time velocity of the previous round) and the target's real-time position.

[0052] By charging and delaying the stapling of the bullet, there is no need to use detonators and explosives in the bullet, nor is there a need to set up explosion-proof devices, thereby reducing the size of the bullet to 14.5 mm; and the prefabricated fragments 7 are ejected from the bullet through gas, thereby also achieving the purpose of shooting down the drone swarm.

[0053] Example 2

[0054] like Figure 2 As shown, one embodiment of the present invention is that the charging and communication interface 3 includes an insulating sleeve 31 and a round-head probe 32. A through hole is provided in the middle of the insulating sleeve 31. One end of the round-head probe 32 passes through the through hole of the insulating sleeve 31. The insulating sleeve 31 contacts the warhead shell 1. The other end of the round-head probe 32 is connected to the input port of the control circuit 4 PCB board (printed circuit board), and the other input port of the control circuit 4 PCB board is connected to the warhead shell 1; the insulating sleeve 31 is used to insulate the round-head probe 32 from the warhead shell 1.

[0055] The round probe 32 and the bullet shell 1 are connected to the outside as two poles of the input, respectively, for the stapler to charge and delay the staple of the bullet. The charging and communication interface 3 communicates with other devices through the control circuit 4 PCB board.

[0056] By providing the charging and communication interface 3, the bullet can be externally charged, thereby improving the reliability of the control circuit 4 and increasing the number of prefabricated fragments 7 assembled in the U-shaped groove 6, thereby improving the hit rate of the bullet hitting the drone.

[0057] Example 3

[0058] like Figure 1 As shown, one embodiment of the present invention is that a shell is provided on the outside of the gas generator 8, and the inside of the gas generator 8 includes an electrode plug, a bridge wire and a gas generating agent; the electrode plug pin is connected to the ignition output welding pad of the control circuit 4 PCB board; the gas generating agent is installed in the shell of the gas generator 8 and is in contact with the bridge wire.

[0059] The electrode plug is used to safely introduce external current into the gas generator 8. The bridge wire contacts the gas generating agent. When energized, the resistor generates heat, converting electrical energy into thermal energy, thereby reaching the required ignition temperature. The gas generating agent burns rapidly to produce high-pressure gas, driving the mechanical action to eject the prefabricated fragments 7.

[0060] The gas generator 8 replaces traditional explosives as the power source for scattering fragments. The gas generator 8 is usually composed of a gas-producing agent, an ignition bridge wire and an electrode plug, and is encapsulated in a small-sized metal casing. The gas-producing agent mostly uses solid propellants, and its combustion products are mainly gas. There is no detonation wave and fragment scattering, so it is safer. The electrode plug is used to introduce the ignition current of the control circuit 4 into the gas generator 8. After the bridge wire is energized, the gas-producing agent is ignited to generate high-pressure gas to drive the mechanical action. The high-pressure gas generated by the gas generator 8 drives the scattering device to move and push the prefabricated fragments out of the projectile. Since there is no need for explosives to explode, the scattering process will not generate detonation fragments or shock waves, which greatly reduces the risk of accidental explosion.

[0061] The internal equipment of the gas generator 8 is highly integrated and works in coordination to provide power for the bullet and prefabricated fragments 7.

[0062] Example 4

[0063] In another embodiment of the present invention, corresponding holes are provided on the spreading device and the projectile housing 2, and the pin 10 connects the spreading device to the projectile housing 1 through the hole, and the pin 10 is used to limit the rotation and forward and backward movement of the spreading device.

[0064] The strength of the pin 10 has been calculated, and the pin 10 can be used for limiting and can also break when subjected to force without affecting the operation of the dispensing device. Specifically, on the one hand, the pin 10 can withstand stresses such as rotation and vibration when the bullet is flying normally, and keep the dispensing device and the projectile relatively fixed. On the other hand, when the gas generator 8 is started and the dispensing device is subjected to axial thrust, the pin 10 will break due to the shear force exceeding the limit, so that the dispensing device can smoothly separate from the projectile and complete the fragment dispensing action, and the bullet and the prefabricated fragments 7 can attack the drone swarm target at the same time, thereby improving the accuracy of the hit.

[0065] Example 5

[0066] Another embodiment of the present invention is that the spreading device is provided with a central through hole, and the central through hole is used for passing wires and wiring; after the gas generator 8 is installed, the central through hole is sealed.

[0067] In order to prevent gas leakage, after the gas generator 8 is installed, the central through hole is sealed with a sealant such as epoxy or sealant; the central through hole is provided to facilitate the connection of wires, etc.

[0068] Example 6

[0069] Another embodiment of the present invention is that a sealing ring 9 is provided on the spreading device, and the sealing ring 9 is used to seal the gas.

[0070] The sealing ring 9 is used to seal the gas generated by the gas generator 8, so that the gas is sealed in the spreading device to avoid gas leakage, affecting the internal air pressure of the bullet, and causing dangerous situations such as gas leakage.

[0071] Example 7

[0072] like Figure 4 As shown, another embodiment of the present invention is that the PCB board includes a controller MCU, an overload switch 5, a communication circuit, a secondary power supply circuit and a gas generator 8. The overload switch 5 controls the startup of the controller MCU, and the controller MCU is connected to the gas generator 8 and the communication circuit; the communication circuit includes a communication drive power supply, which is used to provide power for communication between the PCB board and the bullet; the controller MCU is connected to an external device through two non-polarity buses, and the external device is used to delay the stapling of the bullet and transmit electrical energy; the secondary power supply circuit is used to provide secondary power to the bullet after the controller MCU is disconnected from the bullet.

[0073] The working process is as follows: the controller MCU is connected to the bullet through two non-polarity buses to delay the binding of the bullet and transmit power to the bullet; before the bullet is fired, it is connected to the external binding device through the charging and communication interface 3, and the external device charges the battery inside the bullet and binds the required delay time according to parameters such as target distance and projectile initial velocity; when the bullet is bound, the bullet is disconnected from the external device, and the bullet relies on the internal secondary power circuit to achieve a working time of 10 seconds and enter the ready state; when the bullet is loaded into the chamber and fired, the high pressure generated by the combustion of the propellant pushes the projectile to accelerate, causing the bullet to withstand huge acceleration (up to tens of thousands of g); under the impact of the gas generator 8, the built-in overload switch 5 is closed (for example, by inertia force The contacts close, signaling "launch has occurred" to the control circuit. After detecting the launch signal, the controller MCU initiates a timing program and activates a safety lockout period. In this embodiment, the safety lockout period is 50 milliseconds. During this period, even if there is an accidental trigger, the gas generator 8 will not be activated, ensuring that the bullet has flown a sufficient distance from the muzzle to avoid danger to the shooter. When the safety lockout period expires, the control circuit 4 begins counting down the delay time, and the controller MCU continues the delay. When the delay ends, it outputs an execution signal to the gas generator 8. When the predetermined time is reached, the control circuit 4 discharges the bridge wire of the gas generator 8 through the secondary power circuit on the PCB board. The electrical energy of the bridge wire is converted into thermal energy, which heats up and ignites the gas-generating agent. The gas-generating agent rapidly burns to produce high-pressure gas, which propels the dispensing device, separating the projectile shell 2 from the dispensing device and removing the radial constraints of the projectile shell. At this time, the bullet is still rotating at high speed, and the fragments are scattered into the surrounding space under the action of centrifugal force, forming a fragment dispersion surface that covers and damages drones in the target area, thereby completing the bullet launch.

[0074] Example 8

[0075] like Figure 1 As shown, the control circuit 4 includes a fixing bracket and a PCB board. The PCB board is fixed on the fixing bracket, and the control circuit 4 is sealed in the bullet shell 1 by sealing glue.

[0076] Figure 1 In the figure, the white area below the control circuit 4 is potting glue, which is used to pot the control circuit 4 in the bullet shell 1 to prevent the connection between the control circuit 4 and other devices from being broken when the bullet rotates, thereby affecting the operation of the bullet. At the same time, the control circuit 4 can withstand the high overload impact during firing and prevent the circuit components from loosening during high-speed rotation.

[0077] In the present invention, the type and quantity of prefabricated fragments can be adjusted as needed. For example, steel balls, tungsten balls, steel columns or tungsten columns can be used as prefabricated fragments, and their size range is usually about 1 to 5 mm in diameter and 1 to 5 mm in length. Tungsten alloy fragments have high density, high kinetic energy, and better destructive efficiency; steel balls have lower cost. In an example structure, 8 U-shaped grooves 6 are evenly distributed on the outer wall of the dispersing device, and each groove is pre-installed with 7 steel balls with a diameter of about 3 mm, which can carry a total of 56 prefabricated fragments. The number of U-shaped grooves 6 and the number of fragments in each groove can be designed and adjusted according to the bullet size and combat requirements to maximize the number of fragments or optimize the fragment distribution density in a limited space.

[0078] 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 and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A 14.5mm pre-fragmented bullet, comprising a warhead and a body, both of which are provided with a casing, characterized in that: The warhead housing is equipped with a charging and communication interface, a control circuit and an overload switch. One end of the charging and communication interface is connected to the control circuit, which is connected to the overload switch; the ignition output end of the control circuit is connected to the gas generator; A spreading device is provided inside the shell of the projectile, and a U-shaped groove is provided on the outer wall of the spreading device for assembling prefabricated fragments; a groove is provided at one end of the spreading device, and a gas generator is installed in the groove; One end of the spreading device connected to the bullet is provided with a thread, and the spreading device is connected to the bullet through the thread.

2. A prefabricated fragmentation type 14.5 mm bullet according to claim 1, characterized in that: The charging and communication interface includes an insulating sleeve and a round-head probe. A through hole is provided in the middle of the insulating sleeve. One end of the round-head probe passes through the through hole of the insulating sleeve, and the insulating sleeve contacts the warhead shell. The other end of the round-head probe is connected to the input port of the control circuit PCB, and the other input port of the control circuit PCB is connected to the warhead shell; the insulating sleeve is used to insulate the round-head probe from the warhead shell.

3. A prefabricated fragmentation type 14.5 mm bullet according to claim 2, characterized in that: The gas generator is provided with a shell outside, and the gas generator includes an electrode plug, a bridge wire and a gas generating agent inside; the electrode plug pin is connected to the ignition output welding pad of the control circuit PCB board; The gas generating charge is housed in the gas generator housing and in contact with the bridge wire.

4. A prefabricated fragmentation type 14.5 mm bullet according to claim 3, characterized in that: There are corresponding holes on the spreading device and the projectile shell. The pins connect the spreading device to the bullet shell through the holes, and the pins are used to limit the rotation and forward and backward movement of the spreading device.

5. A prefabricated fragmentation type 14.5 mm bullet according to claim 4, characterized in that: The spreading device is provided with a central through hole for passing the wire; after the gas generator is installed, the central through hole is sealed.

6. A prefabricated fragmentation type 14.5 mm bullet according to claim 5, characterized in that: A sealing ring is provided on the spreading device, and the sealing ring is used to seal the gas.

7. A prefabricated fragmentation type 14.5 mm bullet according to claim 1, characterized in that: The control circuit includes a fixing bracket and a PCB board. The PCB board is fixed on the fixing bracket, and the control circuit is sealed in the warhead shell by sealing glue.

8. A prefabricated fragmentation type 14.5 mm bullet according to claim 7, characterized in that: The PCB board includes a controller, an overload switch, a communication circuit, a secondary power supply circuit and a gas generator. The overload switch controls the start-up of the controller, and the controller is connected to the gas generator and the communication circuit; the communication circuit includes a communication drive power supply, which is used to provide power for communication between the PCB board and the bullet; the controller is connected to an external device through two non-polarity buses, and the external device is used to delay the stapling of the bullet and transmit electrical energy; the secondary power supply circuit is used to provide secondary power to the bullet after the controller is disconnected from the bullet.

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