Electromagnetic gun

Abstract

The invention discloses an electromagnetic gun, and relates to the technical field of electromagnetic guns. The electromagnetic gun comprises a gun body and a safety management system, a handheld groove and a movable groove are formed in the outer wall of the gun body, a trigger is movably connected to the position, located at the movable groove, of the inner side of the gun body, a spring is hung on the outer wall of one side of the trigger, the other end of the spring is connected with the inner wall of the gun body, and an electromagnetic launching device is arranged in the gun body; the electromagnetic launching device comprises a mounting shell, a magnetic resistance type coil is fixedly connected to the inner wall of the mounting shell, a projectile launching opening is formed in the outer wall of the top of the mounting shell and the outer wall of the top of the gun body, and a stop hook is arranged on the inner wall of the mounting shell in a penetrating mode. The launching system is a core device of the whole electromagnetic automatic rifle, aiming at the technical development and maturity of various electromagnetic launching devices at present, the magnetic resistance type electromagnetic coil is selected as a driving coil of the launching system, the problems that a traditional gun is large in noise, high in recoil force and the like are solved, operation is easy, and use is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic guns, and in particular to an electromagnetic gun. Background Art

[0002] The design of traditional firearms usually includes several key structures, such as gas holes, firing pins and ejection ports. These structures play a vital role in the firing process of firearms. The gas holes are used to guide the gunpowder gas out of the gun barrel to reduce recoil and muzzle rise; the firing pin is used to strike the ammunition primer to cause the ammunition to explode; the ejection port is responsible for ejecting the shell casing from the gun after firing. The existence of these structures enables traditional firearms to successfully complete the shooting action.

[0003] The gas holes, firing pins, ejection ports and other structures in the design of traditional firearms are noisy and smoky during use, which is not conducive to concealment during combat. In addition, the range of traditional firearms depends largely on the amount of gunpowder. The greater the amount of gunpowder, the greater the thrust generated and the longer the range. However, increasing the amount of gunpowder will also bring a series of problems, such as increasing the recoil of the firearm and reducing the shooting accuracy. Therefore, the range of traditional firearms is often limited by the amount of gunpowder, making it difficult to meet certain special combat needs. Summary of the invention

[0004] The purpose of the present invention is to provide an electromagnetic gun, which solves the technical problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: an electromagnetic gun, comprising a gun body and a safety management system, wherein the outer wall of the gun body is provided with a hand grip groove and a movable groove, a trigger is movably connected to the inner side of the gun body and located at the movable groove, a spring is hung on the outer wall of one side of the trigger, the other end of the spring is connected to the inner wall of the gun body, and an electromagnetic launch device is arranged inside the gun body; The electromagnetic launch device comprises a mounting shell, the inner wall of the mounting shell is fixedly connected with a magnetic resistance type coil, the mounting shell and the top outer wall of the gun body are provided with a projectile launching port, the inner wall of the mounting shell is interspersed with a blocking hook, the inner wall of the mounting shell is movably connected with a baffle, one end of the blocking hook is fixedly connected with the outer wall of the baffle, one side of the blocking hook is provided with a connecting rod, the bottom outer wall of the connecting rod is provided with a push rod, and one end of the connecting rod is fixedly connected with the outer wall of one side of the trigger; A magazine is provided on the top outer wall of the mounting shell and at the projectile launching port, a barrel is provided on the inner wall of the gun body, the barrel is connected to the magnetic resistance coil, a sight frame is fixedly connected to the top outer wall of the gun body, a reflective sight is provided on the top outer wall of the sight frame, a battery, a step-down module and a relay module are fixedly connected to the inner wall of the gun body, the battery supplies power to the launching system one way and supplies power to the safety management system through the step-down module the other way.

[0006] Preferably, the baffle is L-shaped, and the outer wall of the baffle abuts against the top of the inner wall of the mounting shell.

[0007] Preferably, a strap is tied between the connecting rod and the blocking hook, and between the connecting rod and the outer wall of the push rod, and the connecting rod and the blocking hook, and between the connecting rod and the push rod are fixedly connected by the strap.

[0008] Preferably, the magazine includes a lower protective cover, an upper protective cover, a feeding wheel, a bottom cover, a bullet pushing block, and a flat spring. The lower protective cover is clamped with the upper protective cover, the inner wall of the upper protective cover is clamped with the feeding wheel, the tail of the lower protective cover and the upper protective cover is provided with a bottom cover, the inner wall of the upper protective cover is fixedly connected with the flat spring, the bottom outer wall of the upper protective cover is provided with a sliding groove, the inner wall of the sliding groove is slidably connected with the bullet pushing block, one side outer wall of the bullet pushing block is connected to the flat spring, and the other end of the bullet pushing block abuts against the outer wall of the bullet.

[0009] Preferably, a feeding port is provided on the outer wall of the feeding wheel, and the feeding port is cylindrical. The bullets in the magazine are arranged perpendicular to the axis of the barrel. An annular spiral groove is designed inside the magazine so that the bullets can rotate 90° clockwise through the rotating groove when exiting the magazine and enter the electromagnetic launching device.

[0010] Preferably, the projectile exit speed is not directly proportional to the working time of the drive coil. The higher the supply voltage, the shorter the time it takes for the projectile to reach the center point of the coil. If the switch signal pulse width is set too large, it will cause the projectile to be pulled back, reducing the exit speed of the bullet and reducing the energy efficiency conversion.

[0011] Preferably, the projectile is a ferromagnetic material, and the projectile is made of iron, cobalt, nickel, steel, alloy, or iron oxide.

[0012] Preferably, a rotating safety mechanism is provided on the left side of the trigger, and the safety mechanism comprises a rotating plate and a screw. During the shooting stage, the screw is loosened and the safety mechanism is rotated 90° clockwise to unlock the trigger.

[0013] Compared with the related art, the electromagnetic gun provided by the present invention has the following beneficial effects: 1. The present invention provides an electromagnetic gun. The electromagnetic launching device consists of three parts: launching system, ammunition feeding system, power supply system and appearance structure design. The launching system is the core device of the whole electromagnetic automatic rifle. According to the current technical development and maturity of various electromagnetic launching devices, the magnetic resistance electromagnetic coil is selected as the driving coil of the launching system, which improves the traditional firearms with high noise and strong recoil, and is simple to operate and easy to use.

[0014] 2. The present invention provides an electromagnetic gun, which designs a matching bullet feeding system and power supply system based on the principle and basic characteristics of the reluctance electromagnetic coil, so that the electromagnetic launching device can launch projectiles stably, accurately, quickly and continuously.

[0015] 3. The present invention provides an electromagnetic gun which can fire silently and continuously and can adjust the range by changing the external voltage and the number of driving coils. The overall modular design of the gun can be disassembled and assembled freely, which is suitable for the daily management and actual combat training of the troops. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the partial structure of the present invention Figure 1 ; Figure 3 It is a schematic diagram of the partial structure of the present invention Figure 2 ; Figure 4 For the present invention Figure 2 The enlarged structural diagram at A in the middle; Figure 5 For the present invention Figure 2 The enlarged structural diagram at B in the middle; Figure 6 It is a schematic diagram of the exploded structure of the magazine of the present invention; Figure 7 A primary coil circuit diagram of the present invention; Figure 8 It is a schematic diagram of the projectile triggering position of the present invention; Fig. 9 This is a wiring diagram of the step-down module of the present invention; Fig.10 It is the workflow diagram of the safety management system of the present invention; Fig.11 A schematic diagram of the safety management system of the present invention; Fig.12 It is the overall design flow chart of the present invention.

[0017] In the figure: 1. gun body; 2. grip groove; 3. movable groove; 4. trigger; 5. spring; 6. mounting shell; 7. magnetic resistance coil; 8. blocking hook; 9. connecting rod; 10. push rod; 11. strap; 12. baffle; 13. magazine; 131. lower protective cover; 132. upper protective cover; 133. feeding wheel; 134. bottom cover; 135. push block; 136. flat spring; 14. barrel; 15. sight frame; 16. reflex sight; 17. battery; 18. step-down module; 19. relay module. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-12 The present invention provides a technical solution: an electromagnetic gun, comprising a gun body 1 and a safety management system, wherein the outer wall of the gun body 1 is provided with a hand grip groove 2 and a movable groove 3, a trigger 4 is movably connected to the inner side of the gun body 1 and located at the movable groove 3, a spring 5 is hung on the outer wall of one side of the trigger 4, the other end of the spring 5 is connected to the inner wall of the gun body 1, and an electromagnetic launch device is arranged inside the gun body 1; The electromagnetic launch device includes a mounting shell 6, the inner wall of the mounting shell 6 is fixedly connected with a magnetic resistance type coil 7, the mounting shell 6 and the top outer wall of the gun body 1 are provided with a projectile launching port, the inner wall of the mounting shell 6 is interspersed with a blocking hook 8, the inner wall of the mounting shell 6 is movably connected with a baffle 12, one end of the blocking hook 8 is fixedly connected with the outer wall of the baffle 12, one side of the blocking hook 8 is provided with a connecting rod 9, the bottom outer wall of the connecting rod 9 is provided with a push rod 10, and one end of the connecting rod 9 is fixedly connected with the outer wall of one side of the trigger 4; A magazine 13 is arranged on the top outer wall of the mounting shell 6 and located at the projectile launching port, a barrel 14 is arranged on the inner wall of the gun body 1, the barrel 14 is connected to the magnetic resistance coil 7, a sight frame 15 is fixedly connected to the top outer wall of the gun body 1, a reflective sight 16 is arranged on the top outer wall of the sight frame 15 (using the reflective sight, you only need to aim the red dot or the front sight at the target to shoot, avoiding the disadvantage of aiming at the baseline), a battery 17, a step-down module 18, and a relay module 19 are fixedly connected to the inner wall of the gun body 1, the battery 17 supplies power to the launching system one way, and supplies power to the safety management system through the step-down module 18 the other way.

[0020] In this implementation scheme, the power supply system is the energy source of the electromagnetic automatic rifle, and it mainly provides driving power for the electromagnetic launch system and the safety management system. On the premise that the host and IC of the electromagnetic launch device can work normally, 20V-30V (instantaneous driving current 30A) can be provided; from the working characteristics of the safety management system, it can be known that a 5V (1A) voltage is required to drive it to work. In order to meet the simultaneous operation of the dual systems, the system is built with two lithium batteries in series as the power supply. To ensure the safety of the circuit, the power supply system uses an XT60 parallel adapter cable to divide it into two routes, one for powering the launch system (22.2V, 135A), and the other for powering the safety management system through a step-down module (5V, 1A). When the system is powered, the electromagnetic launch system and the safety management system work simultaneously. Enter the preset password on the matrix button, the relay is closed, and the electromagnetic automatic rifle is ready for firing. Trigger the switch to fire; Lithium battery selection: The power supply system uses two secondary energy storage high-rate lithium batteries in series. This type of battery cell is a lithium polymer with obvious heat dissipation and good cycle performance. The battery has the characteristics of small size, large capacity, light weight, long battery life, and high current output (instantaneous current 135A). It is suitable for the design of electromagnetic automatic rifles. The overall miniaturization and modularization. (High-rate lithium batteries have the following characteristics: (1) Capacitor capacity: 3000MAH (2) Battery cell combination: 3S1P (3) Rated voltage: 11.1V (4) Discharge rate: 45C (5) Current: Instantaneous current 135A (connected using XT60 wiring port) to meet the normal use requirements of the electromagnetic launch system, rated current: 30A) Step-down module selection: To meet the power supply requirements of the security management system, one of the power supply systems needs to output a 5V (1A) voltage through a step-down module. The power supply system uses a non-isolated DC-DC step-down module, which has the characteristics of small size, light weight, and strong compatibility.

[0021] Safety Management System: In combination with the actual needs of electromagnetic automatic rifle safety management, the safety management system selects hardware models based on the principles of modularization, integration, and low energy consumption, so as to facilitate the flexible use of the overall embedded electromagnetic automatic rifle. The system mainly consists of the STM32F103C8T6 minimum system core board, buzzer module, relay module, OLED display module, EMPROM storage module, etc. The security management system is divided into three states: normal mode, management mode and transmission mode. When the power supply system is powered on, the system automatically enters the normal mode, and the interface displays Password, mode: N. Enter the programmed password through the matrix buttons. If it is correct, the system enters the transmission mode. The interface displays PasswordOK, S8launch, S12cancel, S4exits. In the transmission mode, the system can control the closing and disconnection of the relay module through the matrix buttons, and can also choose to return to the normal mode. The management mode interface displays Password, mode: A. The system can modify the transmission password in the management mode. If the password is successfully modified, the display module displays "newpassword". In both normal mode and administrator mode, if the password is entered incorrectly three times, the system will sound an alarm through the buzzer.

[0022] The safety management system uses the STM32F103C8T6 minimum core system board, an embedded microcontroller consisting of five parts: power supply, clock, reset, debug, and control chip. The safety management system uses a 0.96-inch OLED blue light display as the display module. The safety management system uses AT24C02.2KBIt serial EEPROM memory, which has a memory of 256 bytes and can be erased and written multiple times within a millisecond time period.

[0023] Software design: The safety management system software development adopts KeiluVision5, which is a 51 series and STM32 series compatible microcontroller ℃ language software development system developed by Keilsoftware in the United States. It can provide a complete development solution including C compiler, macro assembler, linker, library management and a powerful simulation debugger, etc., which is brought together by inheriting the development environment for developers to use flexibly.

[0024] Software alarm function design: The security management system selects an active buzzer module as an alarm device. The buzzer has a built-in S8050 transistor drive circuit, and the working voltage is 5V, which can be directly connected to the microcontroller. The for function is used to count the number of errors in both normal mode and administrator mode. If the cumulative number of errors exceeds three times, the host uses the GPIOSetBits function to pull up the PA9 pin level to drive the buzzer alarm.

[0025] Software OLED state conversion design: The OLED display module can display three states: normal mode, emission mode, and administrator mode. The system initial interface is normal mode (Mode: N).

[0026] Software storage function design: By connecting the external UART serial port (PA11, PA12) of the microcontroller with the AT24CO2 storage module, the system can automatically save the stored information after power failure.

[0027] The baffle plate 12 is L-shaped, and the outer wall of the baffle plate 12 abuts against the top of the inner wall of the mounting shell 6 .

[0028] Among them, a binding belt 11 is tied between the connecting rod 9 and the outer wall of the blocking hook 8, and the connecting rod 9 and the push rod 10, and the connecting rod 9 and the blocking hook 8, and the connecting rod 9 and the push rod 10 are fixedly connected by the binding belt 11.

[0029] Among them, the magazine 13 includes a lower protective cover 131, an upper protective cover 132, a feeding wheel 133, a bottom cover 134, a bullet pushing block 135, and a flat spring 136. The lower protective cover 131 is clamped with the upper protective cover 132, and the inner wall of the upper protective cover 132 is clamped with the feeding wheel 133. The tail of the lower protective cover 131 and the upper protective cover 132 is provided with a bottom cover 134, the inner wall of the upper protective cover 132 is fixedly connected with the flat spring 136, and the bottom outer wall of the upper protective cover 132 is provided with a sliding groove, and the inner wall of the sliding groove is slidably connected with the bullet pushing block 135, one side outer wall of the bullet pushing block 135 is connected to the flat spring 136, and the other end of the bullet pushing block 135 abuts against the outer wall of the bullet.

[0030] The outer wall of the feeding wheel 133 is provided with a feeding port, which is cylindrical. The bullets in the magazine 13 are arranged perpendicular to the axis of the barrel 14. The magazine 13 is designed with an annular spiral groove so that the bullets can be rotated 90° clockwise through the rotating groove when exiting and enter the electromagnetic launcher. The magazine of the electromagnetic automatic rifle is a modification of the P90 version. On the basis of double-row feeding, the bullet pusher block is cut and the lower cover is partially raised to become a single-row feeding. The magazine capacity is 25 rounds.

[0031] In this embodiment, when in use, the magazine 13 is filled with bullets, and the trigger 4 is pulled. The trigger 4 drives the connecting rod 9 and the blocking hook 8 to move away from the electromagnetic launch device through the push rod 10, and the blocking hook 8 drives the baffle 12 to move accordingly, and the projectile launch port is exposed. The magazine 13 pushes the bullet downward, and the bullet falls. When the launch button is triggered, the capacitor provides an instantaneous high voltage to the coil, and the single-chip microcomputer accurately controls the IGBT conduction time. The coil generates a strong magnetic field to attract the projectile. When passing through the center of the coil, the single-chip microcomputer controls the IGBT to disconnect. Due to the inertia, the projectile repeats the above process when it moves linearly in the inner ring to the second stage. In the electromagnetic launch device of the magnetic resistance coil 7, the stationary projectile with an initial velocity can be accelerated, and the bullet is fired outward through the barrel 14. The electromagnetic launch device remains through, and the trigger 4 can be pulled to continuously fire bullets.

[0032] Among them, the projectile exit speed is not directly proportional to the working time of the driving coil. The higher the supply voltage, the shorter the time it takes for the projectile to reach the center point of the coil. If the switching signal pulse width is set too large, it will cause the projectile to be pulled back, reducing the bullet exit speed and reducing the energy efficiency conversion.

[0033] In this implementation, the electromagnetic launch system selects the 5-level coil as the driving coil. When the launch button is triggered, the capacitor provides an instantaneous high voltage to the coil, the single-chip microcomputer accurately controls the IGBT conduction time, the coil generates a strong magnetic field to attract the projectile, and the single-chip microcomputer controls the IGBT to disconnect when the projectile passes through the center of the coil. Due to inertia, the projectile moves in a straight line in the inner ring to the second level and repeats the above process.

[0034] The basic working principle of the electromagnetic launch system is explained by taking the first-stage coil as an example. The circuit is divided into three parts: the first part is the single-chip control circuit; the second part is the IGBT control circuit; the third part is the power supply circuit. When the launch button is not triggered, the minimum system core board 10 port outputs a high level of 3.3V, the optocoupler external power supply voltage is 3.3V, the potential difference between the 1st and 2nd pins of the optocoupler input is 0, the light-emitting diode is reversely cut off, and the optocoupler output is in the cut-off state. The circuit uses a dual power supply. When the optocoupler output is in the cut-off state, the voltages at both ends of R2 and R3 are -2V. The negative voltage makes the IGBT disconnect more quickly and thoroughly, so the control coil works more accurately: when the launch button is triggered, the minimum system core board 10 port outputs a low level, a potential difference is generated between the 1st and 2nd pins of the optocoupler input, the light-emitting diode is forward-conducted, the optocoupler output senses light and turns on, the gate voltage is approximately equal to the power supply voltage, and the IGBT conduction capacitor discharges the electromagnetic coil to generate an instantaneous strong magnetic field to accelerate the bullet.

[0035] The electromagnetic launch device controlled by the single-chip microcomputer is a new product that is optimized and modified from the traditional electromagnetic gun model. The system design is equipped with overpressure protection. The host has the advantages of high integration, high reliability, high efficiency conversion, high firing rate, low heat generation, etc. It has two firing modes: single shot and continuous shot.

[0036] System hardware selection and structure optimization: 1. IGBT (G100H603) The insulated gate bipolar transistor (IGBT) is composed of a combination of a triode and a MOS tube. It has the advantages of high withstand voltage, large channel current, low on-resistance, and no consumption of driving current. It is suitable for use as a switch in high-power driving circuits.

[0037] When the gate voltage is high, the MOS tube is turned on, the transistor collector and base form a low resistance state and are turned on, and the IGBT collector and emitter are turned on: when the gate voltage is not high, the IGBT collector and emitter are disconnected, achieving the high input impedance of the MOS tube and the low on-resistance characteristics of the transistor. The electromagnetic launch system combines the working characteristics of IGBT (G100H603), and controls the input voltage of the IGBT through the single-chip microcomputer to accurately control the working time of the drive coil, avoiding the disadvantages of traditional thyristors that control on but not off, and maximizing the system energy conversion efficiency and projectile exit speed. Due to the working characteristics of the IGBT, when the capacitance capacity meets the requirements of multiple launches, continuous launch of the electromagnetic automatic rifle can be achieved.

[0038] 2. Single chip microcomputer (STC15F100W) STC15F100W consists of a central processing unit (CPU), program memory (Flash), data memory (SRAM), timer / counter, power-off wake-up dedicated timer, I0 port, watchdog, on-chip high-precision R / C clock and high-reliability reset modules. It is a new type of single clock / machine cycle (1T) product with high speed, high reliability, strong anti-interference, low power consumption, strong confidentiality and other characteristics. Its working characteristics are as follows: (1) With EEPROM function, the number of erase and write times can reach more than 100,000 times (2) Operating voltage: 5.5V-3.8V; Operating frequency: 5MHZ-35MHZ (3) SRAM capacity 128 bytes (4) It can be switched into four modes: bidirectional port pull-up, forced push without pull-up, input / high impedance, and open drain. STC15F100W; STCI5F100W has external interrupt and timing functions. When the launch button is not triggered, the circuit inside the microcontroller executes the main program function in a loop; when the launch button is triggered, pin 3 receives a switch signal and the main program is interrupted externally. At this time, the internal circuit completes the delay process of "pulling the level down, delaying, and pulling the level up" to control the high and low level duration of the IGBT gate. When the internal circuit receives the signal of the flag bit, it continues to execute the main program function in a loop.

[0039] From the working principle of IGBT, when the gate is at a high level, the circuit is in the on state. The high and low level time of the IGBT gate can be controlled by adjusting the adjustable pulse width electrical signal output by the J0 port of the STC15F100W microcontroller to accurately control the switching time. From the working principle of the electromagnetic launch device, it can be known that the projectile exit speed is not directly proportional to the working time of the drive coil. The higher the supply voltage, the shorter the time it takes for the projectile to reach the center point of the coil. If the switch signal pulse width is set too large, it will cause the projectile to be pulled back, the bullet exit speed will be reduced, and the energy efficiency conversion will be reduced. In the reluctance coil electromagnetic launch device, static and initial velocity projectiles can be accelerated. Through the comparison of experimental simulation data, it can be found that the greater the initial velocity of the projectile, the smaller its optimal launch position. Through experimental verification, the first-level switch signal pulse width of the electromagnetic launch device is finally selected as 2000us, which decreases by 50us from front to back, and the five-level switch signal pulse width is 1800us; the adjacent IGBT action interval is 100us.

[0040] 3. Optocoupler (PC817) PC817 is composed of an infrared emitting diode (IRIED) and a photoelectric transistor. When the optocoupler input receives an electrical signal through optical coupling interaction, the infrared emitting diode is forward-conducted, and the phototransistor light receiver is sensitive to the light and generates photocurrent output, thus realizing the "electric-optical-electrical" conversion and playing the role of electrical isolation.

[0041] From the working characteristics of the single-chip microcomputer, we can know that its driving voltage is 3.3V, while the driving voltage of the IGBT is 12V, and the collector and emitter voltages are as high as tens of volts. The input end of the optocoupler receives the electrical signal from the I0 port and converts it into an optical signal, and the output end converts the optical signal into an electrical signal and transmits it to the IGBT gate as a signal to control the switch. The optocoupler realizes the functions of electrical isolation and signal amplification in the circuit, protecting the single-chip microcomputer from being burned out.

[0042] 4. Diode ① Freewheeling diode (D1): According to Lenz's law, when the IGBT is disconnected, the current in the electromagnetic coil will continue to flow in the original direction and magnitude. At this time, the forward current passes through the diode to form a loop, releasing the residual energy of the electromagnetic coil and preventing the energy from being converted into potential energy to break down the IGBT.

[0043] ② Zener diode: When the gate voltage is greater than the Zener diode conduction voltage, D2 and D3 are turned on to prevent the absolute value of the voltage from being too large to damage the IGBT: ③ Zener diode (D4): prevents capacitor voltage from flowing back and damaging the battery.

[0044] Among them, the projectile is a ferromagnetic material, and the projectile is iron, cobalt, nickel, steel, alloy, and iron oxide material.

[0045] In this embodiment, it can be known from the working principle of the magnetic resistance coil that the emitter must be a ferromagnetic material, and the force applied to the ferromagnetic material in the driving coil tube can be obtained by using the virtual displacement principle.

[0046] 1. Projectile material selection According to the basic working principle of electromagnetic launch by magnetic resistance coil, ferromagnetic materials should be selected for launching projectiles. Iron, cobalt, nickel, steel, alloys and iron oxide are all ferromagnetic materials. Under ideal conditions, pure iron has the best magnetic conductivity, but its anti-oxidation performance is poor and its rigidity is soft, which is not conducive to mass production, storage and recycling.

[0047] The selection of ferromagnetic materials should comprehensively consider the magnetization curve and Curie point. Ferromagnetic materials with different magnetization curves produce different magnetization currents under the same current. In addition, the magnetic saturation of ferromagnetic materials also varies greatly with the different magnetization curves. When the magnetic field strength inside the driving coil is too large, the magnetic induction intensity of the ferromagnetic material may reach saturation, so materials with higher magnetic permeability should be selected: The Curie point is also called the magnetic transition point. As the temperature changes, the magnetic properties of ferromagnetic materials (high magnetic permeability, hysteresis characteristics) will be lost. The influence of temperature must be considered in multi-stage electromagnetic launch devices, so materials with high Curie points should be selected. In summary, when selecting projectile materials, materials with fast rising magnetization curves, high magnetic induction intensity saturation points, and high Curie points should be selected.

[0048] Carbon steel is an alloy of iron and carbon. Due to the increase of carbon element, its strength and hardness are improved, and its plasticity and toughness are more reliable. Compared with other ferromagnetic materials, it is more suitable for projectile production.

[0049] 2. Projectile size selection The size of the projectile directly affects the magnetic coupling coefficient, mutual inductance and induced current between the multi-stage drive coil and the projectile, and is an important parameter that determines the exit speed of the projectile. The larger the diameter of the projectile, the smaller the gap between the multi-stage drive coil, and most of the magnetic resistance is close to the air gap between the stator magnetic circuit and the iron core, and the easier it is to establish the magnetic flux. During the movement of the projectile, the magnetic resistance gradually decreases as the air gap decreases, which facilitates the formation of magnetic flux, and the thrust of the electromagnetic force on the projectile also increases. In summary, when selecting the projectile size, it should be as close as possible to the inner diameter of the multi-stage coil. According to the inner diameter of the drive coil (27mm), a projectile with a diameter of 25mm and a total length of 6mm was finally selected as the launcher of the electromagnetic launch device.

[0050] 3. Best launching position for projectiles From the law of magnetic field distribution, it can be seen that the magnetic field strength of each part of the driving coil is different, so the electromagnetic force exerted on the projectile at the moment of launch is also different. If you want to obtain the maximum exit velocity, you must consider the trigger position of the projectile.

[0051] like Figure 8 As shown in the figure, when the projectile trigger position d<0, the projectile is outside the driving coil. When the switch is triggered, the projectile may be subjected to uneven force, resulting in unstable movement direction. When the projectile trigger position d>0, part or all of the projectile is inside the driving coil. When the switch is triggered, the electromagnetic force may be too small to drive the projectile to launch normally. In addition, the short acceleration distance of the projectile may also affect the projectile exit speed. If the electromagnetic launch device is to obtain the maximum conversion efficiency, the selection of the projectile exit launch position is a decisive factor.

[0052] From the comparison of experimental simulation results, it can be seen that when the projectile has no initial velocity, the trigger position has the largest driving force at a distance of 16mm from the driving coil. Through the design of the push rod hook and the cutting of the electromagnetic launch device feed port, the projectile can fall directly to the best launch position when it is ejected from the bullet. The push rod is made of springs, triggers, wires, wooden sticks, hooks, etc. The front end is fixed to the gun casing by a spring, the middle end is connected to the electromagnetic launch system switch device and can control the switch through the extension and contraction of the spring, and the rear end hook is connected to the feed port to fix the bullet launch position: the rear end of the electromagnetic launch device is the feed port, which is tightly connected to the magazine outlet, and a shear plate is added at both ends of the cutting port.

[0053] Among them, a rotating safety mechanism is arranged on the left side of the trigger 4, and the safety mechanism comprises a rotating plate and a screw. During the shooting stage, the screw is loosened and the safety mechanism is rotated 90° clockwise to unlock the trigger 4.

[0054] In this implementation scheme, ① the safety management system can realize the disconnection and closing of the relay by pressing a button in the firing mode. The relay is closed by pressing button S8 during firing and disconnected by pressing button S12 during storage. The electromagnetic automatic rifle can be dynamically controlled to prevent accidental firing. ② The left side of the trigger is designed with a rotating mechanism to improve the safety and reliability of the electromagnetic automatic rifle. In the storage stage, the safety mechanism locks the trigger with a screw: in the shooting stage, the safety mechanism is rotated 90° clockwise to unlock the trigger.

[0055] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An electromagnetic gun, comprising a gun body (1) and a safety management system, Features: The outer wall of the gun body (1) is provided with a grip groove (2) and a movable groove (3); a trigger (4) is movably connected to the inner side of the gun body (1) and located at the movable groove (3); a spring (5) is hung on the outer wall of one side of the trigger (4); the other end of the spring (5) is connected to the inner wall of the gun body (1); and an electromagnetic launch device is arranged inside the gun body (1); The electromagnetic launching device comprises a mounting shell (6), the inner wall of the mounting shell (6) is fixedly connected with a magnetic resistance type coil (7), the mounting shell (6) and the top outer wall of the gun body (1) are provided with a projectile launching port, the inner wall of the mounting shell (6) is interspersed with a blocking hook (8), the inner wall of the mounting shell (6) is movably connected with a baffle (12), one end of the blocking hook (8) is fixedly connected with the outer wall of the baffle (12), one side of the blocking hook (8) is provided with a connecting rod (9), the bottom outer wall of the connecting rod (9) is provided with a push rod (10), and one end of the connecting rod (9) is fixedly connected with the outer wall of one side of the trigger (4); A magazine (13) is arranged on the top outer wall of the mounting shell (6) and at the projectile launching port; a gun barrel (14) is arranged on the inner wall of the gun body (1); the gun barrel (14) is connected to the magnetic resistance coil (7); a sight frame (15) is fixedly connected to the top outer wall of the gun body (1); a reflex sight (16) is arranged on the top outer wall of the sight frame (15); a storage battery (17), a step-down module (18), and a relay module (19) are fixedly connected to the inner wall of the gun body (1); the storage battery (17) supplies a power launch system on one side and supplies a power safety management system on the other side through the step-down module (18).

2. An electromagnetic gun according to claim 1, Features: The baffle (12) is L-shaped, and the outer wall of the baffle (12) abuts against the top of the inner wall of the mounting shell (6).

3. An electromagnetic gun according to claim 1, Features: A binding belt (11) is tied between the connecting rod (9) and the blocking hook (8), and between the connecting rod (9) and the outer wall of the push rod (10); the connecting rod (9) and the blocking hook (8), and between the connecting rod (9) and the push rod (10) are fixedly connected via the binding belt (11).

4. An electromagnetic gun according to claim 1, Features: The magazine (13) comprises a lower protective cover (131), an upper protective cover (132), a feeding wheel (133), a bottom cover (134), a bullet pushing block (135), and a flat spring (136). The lower protective cover (131) is clamped with the upper protective cover (132), the inner wall of the upper protective cover (132) is clamped with the bullet feeding wheel (133), the tails of the lower protective cover (131) and the upper protective cover (132) are provided with the bottom cover (134), the inner wall of the upper protective cover (132) is fixedly connected with the flat spring (136), the bottom outer wall of the upper protective cover (132) is provided with a sliding groove, the inner wall of the sliding groove is slidably connected with the bullet pushing block (135), one side outer wall of the bullet pushing block (135) is connected with the flat spring (136), and the other end of the bullet pushing block (135) abuts against the outer wall of the bullet.

5. An electromagnetic gun according to claim 4, Features: The outer wall of the feeding wheel (133) is provided with a feeding port, which is cylindrical. The bullets in the magazine (13) are arranged perpendicular to the axis of the gun barrel. An annular spiral groove is designed inside the magazine (13) so that the bullets can be rotated 90° clockwise through the rotating groove when exiting the magazine and enter the electromagnetic launch device.

6. An electromagnetic gun according to claim 1, Features: The projectile exit speed is not directly proportional to the working time of the drive coil. The higher the supply voltage, the shorter the time it takes for the projectile to reach the center point of the coil. If the switch signal pulse width is set too large, it will cause the projectile to be pulled back, reducing the bullet exit speed and reducing the energy efficiency conversion.

7. An electromagnetic gun according to claim 1, Features: The projectile is made of ferromagnetic material, and the projectile is made of iron, cobalt, nickel, steel, alloy, and iron oxide material.

8. An electromagnetic gun according to claim 1, Features: The left side of the trigger (4) is provided with a rotating safety mechanism, which comprises a rotating plate and a screw. During the shooting stage, the screw is loosened and the safety mechanism is rotated 90° clockwise to unlock the trigger.

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