Self-driven tail jet regulating and controlling mechanism for sitting force-free cannon

Abstract

The invention discloses a self-driven tail jet regulating and controlling mechanism for a sitting force-free gun. The self-driven tail jet regulating and controlling mechanism comprises a launching barrel, a tail jet pipe, a reset spring, a dynamic throttling film set, a driving disc, an execution piston and a sealing ring. A nested structure is adopted to connect the self-driven regulation and control tail jet mechanism to the non-sitting force gun, the driving disc drives the dynamic throttling film set to adjust the opening degree of the tail jet pipe in a linkage mode through the execution piston on the basis of the reset spring, and the sealing rings are installed on the inner side and the outer side of the execution piston so that the recoil force generated in the projectile launching process can be regulated and controlled in a matched mode. The gunpowder fuel gas generated by launching of the projectile body automatically drives and regulates reciprocating linkage of the tail spraying mechanism to achieve opening and closing of the dynamic throttling film set, and the self-driving type self-driving jet gun has the advantages of self-driving matching linkage, propelling energy efficiency improvement, remarkable recoil reduction, good projectile adaptability and the like when applied to the recoil reduction aspect of the recoil-free gun.

Description

Technical Field

[0001] The invention relates to the technical field of tail nozzles of recoilless guns, and in particular to a self-driven and controlled tail nozzle mechanism for recoilless guns. Background Art

[0002] As the core power balance component of the recoilless gun, the design of the tail nozzle is directly related to the recoil elimination efficiency, gas emission stability and overall firing performance of the weapon system. The recoilless gun adopts an open-bore design with an open tail of the barrel. The tail nozzle adopts an open design, which leads to a certain amount of energy loss. The energy of some high-temperature, high-pressure and high-speed airflow cannot be fully converted into propulsion, which limits the initial velocity and other performance of the projectile to a certain extent. Based on the above shortcomings, the existing design proposes solutions such as the bolt-type air-tight structure and the handle-type locking structure, but it is impossible to dynamically adjust the tail jet range with the movement of the projectile and the firing process, so that the service life and firing performance of the weapon are still limited. The above problems have become one of the key factors restricting the improvement of the combat effectiveness of the recoilless gun. Summary of the invention

[0003] In view of the problems existing in the above-mentioned prior art, the present invention proposes a self-driven and controllable tail nozzle mechanism for a recoilless gun, which is connected to the recoilless gun with a nested structure, and realizes a driving plate to drive a dynamic throttle membrane group to jointly adjust the tail nozzle opening through an actuator piston based on a reset spring, and installs sealing rings inside and outside the actuator piston to match and control the recoil force generated during the launch of the projectile. The purpose is to solve the problems of low energy conversion efficiency of the existing tail nozzle structure, poor projectile launch performance, limited barrel service life and insufficient dynamic control capability.

[0004] In order to achieve the purpose of the present invention, the following technical scheme is adopted: A self-driving and controlled tail spray mechanism for a recoilless gun, comprising a launch tube, a tail spray pipe, a return spring, a dynamic throttle membrane group, a drive plate, an actuator piston, a sealing ring, and a projectile body; The front section of the launch tube is the barrel, the inner side of the barrel is the gun bore, and a nozzle connecting groove is arranged at the rear end, which cooperates with the nozzle connecting boss of the tail nozzle; a self-driven control cavity section is arranged near the rear end face of the launch tube, and the interior is a front and rear two-stage annular cavity, the front stage is a piston movement cavity, and an execution piston is installed, and the inner and outer walls of the execution piston near its own rear end face are respectively provided with an inner sealing groove and an outer sealing groove, and both are equipped with sealing rings, and the inner cavity of the execution piston is a diaphragm movement platform, and the diaphragm movement platform is provided with a plurality of diaphragm guide grooves along the circumferential ring; the rear stage is a spring movement cavity, and a reset spring is installed; a drive disk installation groove and a dynamic throttling membrane group installation groove with a diameter slightly smaller than the reset spring are arranged in sequence between the two-stage cavities, a drive disk is installed in the drive disk installation groove, and a dynamic throttling membrane group is installed in the dynamic throttling membrane group installation groove; the piston movement cavity is connected to the gun bore through a plurality of guide holes; a projectile is installed in the gun bore for launching; The dynamic throttling membrane group is composed of multiple fan-shaped membranes nested and matched with each other through side connection bosses and side connection chutes in a circumferential array. A membrane chute is arranged at the front end of the membrane, and the membrane chute is connected with a guiding boss on the driving disk in a matching manner. A membrane sliding table is arranged at the rear end of the membrane, and is in notch matching with a membrane guiding groove on the membrane movement platform to realize the rotational movement of the membrane; the spiral sliding table arranged along the circumference of the driving disk is connected with the spiral chute of the actuating piston in a matching manner, so as to realize the rotational movement of the driving disk and transfer the load to the membrane to realize the linkage of the dynamic throttling membrane group.

[0005] Further, the self-driven regulation cavity section is divided into two sections, the front section and the rear section, for connection. The inner cavity of the front section is the piston movement cavity, and the inner cavity of the rear section is the spring movement cavity; there is a transition section at the front of the piston movement cavity, which is a diversion hole. The inside of the spring movement cavity is in a circular tube shape and serves as the membrane movement platform. A plurality of membrane guiding grooves are arranged in a circumferential array on the front end face of the membrane movement platform, and are connected with the membrane sliding table on the membrane through the membrane guiding grooves in a matching manner.

[0006] Further, the actuating piston is in a two-stage circular tube shape, the inner diameter of the front stage is smaller than that of the rear stage. Inner sealing grooves and outer sealing grooves with the same size are arranged inside and outside the front stage, and two outer sealing grooves are arranged on the outside and sealing rings are installed. Spiral chutes penetrating inside and outside are arranged in a circumferential array on the rear stage, and are matched with the spiral sliding table arranged along the circumference of the driving disk to convert the axial movement of the actuating piston into the radial movement of the membranes of the dynamic throttling membrane group.

[0007] Further, during the ignition stage at the initial stage of the launch of the projectile body, under the action of the gas pressure in the gun barrel, the projectile body moves forward along the axis of the launch tube. The actuating piston overcomes a certain elastic force of the return spring and moves forward along the axis of the launch tube, drives the driving disk to rotate through the spiral chute, so that the dynamic throttling membrane group is linked to regulate a certain opening degree. As the actuating piston continues to actuate, the opening degree of the dynamic throttling membrane group also increases accordingly.

[0008] Further, after the projectile body leaves the muzzle and enters the aftereffect stage, the gas pressure in the gun barrel rapidly decreases, and the acting force of the gas on the actuating piston is less than the elastic force of the return spring, so that the actuating piston moves reversely along the axis, drives the driving disk to rotate reversely through the spiral chute, so that the dynamic throttling membrane group is linked to reduce the opening degree. As the actuating piston returns to the initial position under the action of the elastic force of the return spring, the dynamic throttling membrane group also returns to the closed state.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The self-driven regulation tail nozzle mechanism provided by the present invention is connected to the recoilless gun through a nested structure, and the reciprocating linkage of the regulation tail nozzle mechanism is self-driven by the gunpowder gas generated by the launch of the projectile body to realize the opening and closing of the dynamic throttling membrane group, so as to reduce the recoil force generated by the launch of the projectile body, and has four functions and advantages: self-driven matching linkage, improved propulsion energy efficiency, significant reduction of recoil, and good projectile type matching.

[0010] 2. Self-driven matching linkage. The self-driven regulation mechanism proposed by the present invention is self-driven by gunpowder gas to actuate the execution piston axially. Through cooperation with the notch of the driving disk, the load is transmitted to the diaphragm to realize the linkage of the dynamic throttling diaphragm group, and it has a dynamic regulation mechanism adapted to the internal flow field of the projectile launch.

[0011] 3. Improvement of propulsion energy efficiency. The dynamic throttling diaphragm group proposed by the present invention can match and regulate the tail nozzle opening in real time with the gas pressure throughout the projectile launch cycle, enabling full conversion of gas energy and improving propulsion energy efficiency.

[0012] 4. Significant reduction of recoil. The dynamic throttling diaphragm group proposed by the present invention can balance the recoil force generated by the gas impact at the initial stage of projectile launch by adjusting the opening, and can complete the adaptive regulation with the in-bore gas pressure throughout the launch cycle, breaking through the contradiction limitation of the recoil force control and pressure stability in the traditional recoilless gun launch.

[0013] 5. Good projectile type matching. The self-driven regulation mechanism proposed by the present invention can adaptively match projectiles with different charge amounts, realizing the self-driven matching regulation of the tail nozzle for the recoilless gun to adapt to the launch of various projectiles. Description of the Drawings

[0014] Figure 1 It is a three-dimensional explosion view of the overall structure of the present invention.

[0015] Figure 2 It is a two-dimensional sectional view of the overall structure of the present invention.

[0016] Figure 3 It is a two-dimensional sectional view of the launch tube of the present invention and a removed sectional view.

[0017] Figure 4 It is a three-dimensional structure and two-dimensional plane schematic diagram of the dynamic throttling diaphragm group and the diaphragm of the present invention.

[0018] Figure 5 It is a three-dimensional structure schematic diagram of the driving disk of the present invention.

[0019] Figure 6 It is a three-dimensional structure schematic diagram of the execution piston of the present invention. Detailed Embodiment

[0020] To make the technical solutions, structural features, and functional principles achieved by the present invention easy to understand, the present invention will be further elaborated below in combination with the drawings and specific embodiments. The described embodiments are only partial embodiments of the present invention.

[0021] In the description of the present invention, it should be noted that certain words indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "provided with", and "connection" should be understood in a broad sense. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] A self-driven regulation tail nozzle mechanism for a recoilless gun according to the present invention includes a launch tube, a tail nozzle, a return spring, a dynamic throttle film group, a drive disk, an actuating piston, a sealing ring, and a projectile. The launch tube and the tail nozzle are connected by thread fitting to form the main structure of the recoilless gun. A self-driven regulation cavity section is provided at the rear end of the launch tube. The self-driven regulation mechanism composed of the return spring, the dynamic throttle film group, the drive disk, the actuating piston, and the sealing ring is placed in the self-driven regulation cavity section. The dynamic throttle film group is composed of multiple mutually cooperating films, and realizes the opening degree adjustment of the tail nozzle channel of the launch tube by cooperating with the drive disk and the actuating piston. The return spring is placed in the self-driven regulation cavity section of the launch tube, connected to the actuating piston, and realizes self-driven reciprocating motion by means of the high-temperature and high-pressure gas generated by the launch of the projectile.

[0024] The launch tube is a circular tubular structure. The front section is a barrel. The inner side of the barrel is a gun chamber. A nozzle connection groove is provided at the rear end, which cooperates with the nozzle connection boss of the tail nozzle. A self-driven regulation cavity section is provided near the rear end face of the launch tube. Its interior is two-stage annular cavities. The front stage is a piston movement cavity for installing the actuating piston, and the rear stage is a spring movement cavity for installing the return spring. A drive disk installation groove and a dynamic throttle film group installation groove with a diameter slightly smaller than that of the return spring are successively provided between the two cavities. The drive disk is installed in the drive disk installation groove, and the dynamic throttle film group is installed in the dynamic throttle film group installation groove. The piston movement cavity and the gun chamber are connected through multiple diversion holes. The projectile is installed in the gun chamber for launch.

[0025] The dynamic throttle film group is composed of multiple fan-shaped films nested and cooperating with each other through side connection bosses and side connection chutes in a circumferential array. A film chute is provided at the front end of the film, which is connected to the guiding boss on the drive disk in a matching manner. A film slide is provided at the rear end of the film, which is in notch cooperation with the film guiding groove on the film movement platform to realize the rotational movement of the film. The spiral slide provided along the circumference of the drive disk is connected to the spiral chute of the actuating piston in a matching manner to realize the rotational movement of the drive disk and transfer the load to the film to realize the linkage of the dynamic throttle film group.

[0026] The self-driven regulation cavity section is divided into front and rear sections for connection. The inner cavity of the front section is the piston movement cavity, and the inner cavity of the rear section is the spring movement cavity. There is a transition section at the front of the piston movement cavity, which is a diversion hole. The inside of the spring movement cavity is circular tube-shaped and serves as the diaphragm movement platform. A plurality of diaphragm guiding grooves are arranged in a circumferential array on the front end face of the diaphragm movement platform, and are connected in cooperation with the diaphragm sliding table on the diaphragm through the diaphragm guiding grooves.

[0027] The driving disk is circular ring-shaped, and a plurality of cylindrical guiding bosses are arranged circumferentially at the back, which are connected in cooperation with the diaphragm sliding grooves of the dynamic throttling diaphragm group, and a plurality of cylindrical spiral sliding tables extending outward are arranged circumferentially.

[0028] The actuating piston is in the shape of a two-stage circular tube, the inner diameter of the front stage is smaller than that of the rear stage. Inner sealing grooves and outer sealing grooves of the same size are arranged inside and outside the front stage, and two outer sealing grooves are arranged on the outside, and sealing rings are installed. Helical chutes penetrating inside and outside are arranged in a circumferential array on the rear stage, and are matched with the spiral sliding tables arranged circumferentially on the driving disk to convert the axial movement of the actuating piston into the radial movement of the diaphragm of the dynamic throttling diaphragm group.

[0029] The reset spring is placed in the spring movement cavity of the launcher tube and is connected with the actuating piston to realize its reciprocating movement. The sealing rings are respectively installed in the inner sealing grooves and outer sealing grooves of the actuating piston to prevent high-temperature and high-pressure gas from leaking into the spring movement cavity and causing abnormal operation.

[0030] The present invention will be further described below through embodiments in combination with the accompanying drawings of the specification.

[0031] In the figures: 1 - launcher tube; 101 - barrel; 102 - gun chamber; 103 - diversion hole; 104 - piston movement cavity; 105 - spring movement cavity; 106 - driving disk installation groove; 107 - dynamic throttling diaphragm group installation groove; 108 - self-driven regulation cavity section; 109 - nozzle connection groove; 110 - diaphragm movement platform; 111 - diaphragm guiding groove; 2 - tail nozzle; 201 - nozzle connection boss; 202 - nozzle expansion section; 3 - reset spring; 4 - dynamic throttling diaphragm group; 401 - diaphragm; 402 - diaphragm sliding table; 403 - diaphragm sliding groove; 404 - side connection boss; 405 - side connection chute; 5 - driving disk; 501 - guiding boss; 502 - spiral sliding table; 6 - actuating piston; 601 - spiral chute; 602 - inner sealing groove; 603 - outer sealing groove; 7 - sealing ring; 8 - projectile body.

[0032] This embodiment provides a self-driven regulation tail nozzle mechanism for a recoilless gun. Figure 1 、 Figure 2 are respectively the three-dimensional explosion view and the two-dimensional sectional view of the overall structure provided by the embodiment of the present invention, as Figure 1 、 Figure 2As shown in the figure, the self-driven and regulated tail nozzle mechanism is connected to the recoilless gun in a nested structure, including a launch tube 1, a tail nozzle 2, a return spring 3, a dynamic throttle film group 4, a drive disk 5, an actuating piston 6, a sealing ring 7, and a projectile 8. The launch tube 1 and the tail nozzle 2 are connected by thread fitting to form the main structure of the recoilless gun. A self-driven and regulated cavity section 108 is provided at the rear end of the launch tube 1. The self-driven and regulated mechanism composed of the return spring 3, the dynamic throttle film group 4, the drive disk 5, the actuating piston 6, and the sealing ring 7 is placed in the self-driven and regulated cavity section 108. The dynamic throttle film group 4 is composed of multiple diaphragms 401 cooperating with each other, and realizes the opening degree adjustment of the tail nozzle channel of the launch tube 1 by cooperating with the drive disk 5 and the actuating piston 6. The return spring 3 is placed in the self-driven and regulated cavity section 108 of the launch tube 1, connected to the actuating piston 6, and realizes self-driven reciprocating motion by means of the high-temperature and high-pressure gas generated by the launch of the projectile 8.

[0033] Figure 3 This is a two-dimensional sectional view and an removed sectional view of the launch tube of the present invention. Combining Figure 3 As shown in the figure, the front section of the launch tube 1 is a barrel 101, the inner side of the barrel is a gun chamber 102, and a nozzle connection groove 109 is provided at the rear end, which cooperates with the nozzle connection boss 201 of the tail nozzle 2; a self-driven and regulated cavity section 108 is provided near the rear end face of the launch tube 1, and it is an inner cavity with two levels of front and rear annular cavities. The front level is a piston movement cavity 104, where the actuating piston 6 is installed. Inner and outer sealing grooves 602 and 603 are respectively provided on the inner and outer walls near the rear end face of the actuating piston 6, and sealing rings 7 are installed on both of them. The inner cavity of the actuating piston 6 is a diaphragm movement platform 110, and a plurality of diaphragm guide grooves 111 are circumferentially and annularly arranged on the diaphragm movement platform 110; the rear level is a spring movement cavity 105, where the return spring 3 is installed; between the two levels of cavities, a drive disk installation groove 106 and a dynamic throttle film group installation groove 107 with diameters slightly smaller than the return spring 3 are successively provided. The drive disk 5 is installed in the drive disk installation groove 106, and the dynamic throttle film group 4 is installed in the dynamic throttle film group installation groove 107; the piston movement cavity 104 and the gun chamber 102 are connected through a plurality of diversion holes 103; the projectile 8 is installed in the gun chamber 102 for launching.

[0034] Figure 4 This is a three-dimensional structure and a two-dimensional plane schematic diagram of the dynamic throttle film group and the diaphragm of the present invention. Combining Figure 4As shown, the dynamic throttling diaphragm group 4 is composed of a plurality of fan-shaped diaphragms 401 arranged in a circumferential array and nested with each other through a side connection boss 404 and a side connection chute 405. A diaphragm chute 403 is provided at the front end of the diaphragm 401, and the diaphragm chute 403 is connected in cooperation with a guiding boss 501 on the driving disk 5. A diaphragm slide 402 is provided at the rear end of the diaphragm 401, and it is in notch cooperation with a diaphragm guiding groove 111 on the diaphragm movement platform 110 to realize the rotational movement of the diaphragm 401; the helical slide 502 arranged circumferentially on the driving disk 5 is connected in cooperation with the helical chute 601 of the actuating piston 6 to realize the rotational movement of the driving disk 5 and transfer the load to the diaphragm 401 to realize the linkage of the dynamic throttling diaphragm group 4.

[0035] Combined with Figure 3 、 Figure 4 As shown, the self-driven regulation cavity section 108 is divided into front and rear sections for connection. The inner cavity of the front section is the piston movement cavity 104, and the inner cavity of the rear section is the spring movement cavity 105; there is a transition section at the front of the piston movement cavity 104 which is a diversion hole 103. The inside of the spring movement cavity 105 is in a circular tube shape and serves as the diaphragm movement platform 110. A plurality of diaphragm guiding grooves 111 are arranged in a circumferential array on the front end face of the diaphragm movement platform 110, and are connected in cooperation with the diaphragm slides 402 on the diaphragms 401 through the diaphragm guiding grooves 111.

[0036] Figure 5 This is a three-dimensional structural schematic diagram of the driving disk of the present invention. Combined with Figure 4 、 Figure 5 As shown, the driving disk 5 is in a circular ring shape, and a plurality of cylindrical guiding bosses 501 are arranged circumferentially at the back, which are connected in cooperation with the diaphragm chutes 403 of the dynamic throttling diaphragm group 4, and a plurality of outwardly extending cylindrical helical slides 502 are arranged circumferentially.

[0037] Figure 6 This is a three-dimensional structural schematic diagram of the actuating piston of the present invention. Combined with Figure 4 、 Figure 5 、 Figure 6 As shown, the actuating piston 6 is in a two-stage circular tube shape, the inner diameter of the front stage is smaller than that of the rear stage. Inner sealing grooves 602 and outer sealing grooves 603 of the same size are provided inside and outside the front stage, and two outer sealing grooves 603 are provided on the outside, and sealing rings 7 are installed. Helical chutes 601 penetrating inside and outside are arranged in a circumferential array in the rear stage, which are in cooperation with the helical slides 502 arranged circumferentially on the driving disk 5 to convert the axial movement of the actuating piston 6 into the radial movement of the diaphragms 401 of the dynamic throttling diaphragm group 4.

[0038] The reset spring 3 is placed in the spring movement cavity 105 of the launch tube 1 and is connected to the actuating piston 6 to realize its reciprocating movement. The sealing rings 7 are respectively installed in the inner sealing groove 602 and the outer sealing groove 603 of the actuating piston 6 to prevent high-temperature and high-pressure gas from leaking into the spring movement cavity 105 and causing abnormal operation thereof.

[0039] The following provides a detailed description of the functional principle and specific technical effects of the self-driven control tail nozzle mechanism provided by the embodiments of the present invention: The self-driven control tail nozzle mechanism provided by the embodiments of the present invention can achieve real-time regulation of the tail nozzle opening degree through the dynamic throttle film group 4 to adaptively match the gunpowder gas pressure during the entire launch cycle of the projectile 8, and has a dynamic regulation mechanism adapted to the internal flow field of the projectile 8 during launch.

[0040] During the period when the projectile 8 is not launched, the self-driven control mechanism of the launch tube 1 does not actuate, and the dynamic throttle film group 4 is in a closed state under the elastic force of the return spring 3. When the gunpowder is ignited at the initial stage of the launch of the projectile 8, the generated gas pressure is relatively low. The chamber pressure causes the actuating piston 6 to overcome a certain elastic force of the return spring 3 and push the actuating piston 6 to actuate along the axis of the launch tube 1. The drive disk 5 is rotated through the spiral chute 601, so that the dynamic throttle film group 4 is linked to regulate a certain opening degree to balance the recoil force. At this time, the opening degree is small, which can not only ensure relatively complete combustion of the gunpowder gas, but also balance the recoil force through a small amount of pressure relief. As the chamber pressure increases, the dynamic throttle film group 4 correspondingly increases the opening degree, showing high adaptability. During the constant volume combustion stage of the propellant, the chamber gas pressure rises rapidly, and the projectile 8 accelerates along the barrel 101. Under the high pressure, the actuating piston 6 is pushed to the maximum stroke. At this time, the dynamic throttle film group 4 reaches the maximum opening degree, and the gas expands and accelerates through the tail nozzle 2 to form a jet flow to generate a negative thrust to balance the recoil force. During the aftereffect stage after the projectile 8 leaves the muzzle, the high-temperature and high-pressure gas continues to expand and accelerate in both directions along the muzzle and the tail nozzle 2. However, as the chamber rapidly decompresses, the recoil force generated by the gas gradually decreases, and the self-driven control mechanism adjusts accordingly. When the acting force of the gas on the actuating piston 6 is less than the elastic force of the return spring 3, the actuating piston 6 actuates in the direction of the initial position, drives the drive disk 5 to rotate in the reverse direction through the spiral chute 601, and makes the dynamic throttle film group 4 linked to reduce the opening degree. As the recoil force decreases, the opening degree is reduced until there is no recoil force, completing the entire process of the launch of the projectile 8 and the tail nozzle regulation.

[0041] In a further preferred embodiment, the present invention only relies on the energy of the gunpowder gas itself during the launch of the projectile 8 to drive the control mechanism to actuate, without any additional drive structure, and can dynamically match and regulate the tail nozzle opening degree with the chamber gas pressure to achieve the dual effects of improving energy efficiency and reducing recoil. The present invention can not only be applied to the regulation of the tail jet flow of recoilless guns, but also can be applied to scenarios involving the regulation of nozzle opening degrees such as rocket engines and aeroengines.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. The number and shape of the diversion holes 103, diaphragm 401, etc. described in the present invention are exemplary displays, and the number, geometric parameters and spatial arrangement of the technical features should be understood as non-limiting embodiments; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A self-driven control tail nozzle mechanism for a recoilless gun, comprising a launch tube (1), a tail nozzle (2), a return spring (3), a dynamic throttle diaphragm group (4), a drive disk (5), an actuating piston (6), a sealing ring (7), and a projectile body (8), characterized in that: The front section of the launch tube (1) is a barrel (101), the inner side of the barrel is a gun chamber (102), and a nozzle connection groove (109) is provided at the rear end, which is matched with the nozzle connection boss (201) of the tail nozzle (2); a self-driven control cavity section (108) is provided near the rear end face of the launch tube (1), and the inside is two-level annular cavities. The front level is a piston movement cavity (104), and the actuating piston (6) is installed. The inner and outer walls of the actuating piston (6) near its rear end face are respectively provided with an inner sealing groove (602) and an outer sealing groove (603), and sealing rings (7) are installed on both. The inner cavity of the actuating piston (6) is a diaphragm movement platform (110), and a plurality of diaphragm guide grooves (111) are circumferentially arranged on the diaphragm movement platform (110); the rear level is a spring movement cavity (105), and the return spring (3) is installed; between the two-level cavities, a drive disk installation groove (106) and a dynamic throttle diaphragm group installation groove (107) with a diameter slightly smaller than the return spring (3) are sequentially arranged. The drive disk (5) is installed in the drive disk installation groove (106), and the dynamic throttle diaphragm group (4) is installed in the dynamic throttle diaphragm group installation groove (107); the piston movement cavity (104) is connected to the gun chamber (102) through a plurality of flow guide holes (103); the projectile body (8) is installed in the gun chamber (102) for launching; The dynamic throttle diaphragm group (4) is composed of a plurality of sector diaphragms (401) nested with each other through side connection bosses (404) and side connection chutes (405) in a circumferential array. A diaphragm chute (403) is provided at the front end of the diaphragm (401), and the diaphragm chute (403) is connected to the guiding boss (501) on the drive disk (5). A diaphragm slide (402) is provided at the rear end of the diaphragm (401), and is in notch fit with the diaphragm guide groove (111) on the diaphragm movement platform (110) to realize the rotational movement of the diaphragm (401); the spiral slide (502) arranged along the circumference of the drive disk (5) is connected to the spiral chute (601) of the actuating piston (6) to realize the rotational movement of the drive disk (5) and transfer the load to the diaphragm (401) to realize the linkage of the dynamic throttle diaphragm group (4).

2. The self-driven regulation tail nozzle mechanism for recoilless guns according to claim 1, characterized in that: The self-driven control cavity section (108) is divided into two sections for connection. The inner cavity of the front section is the piston movement cavity (104), and the inner cavity of the rear section is the spring movement cavity (105); there is a transition section at the front of the piston movement cavity (104) which is the flow guide hole (103). The inside of the spring movement cavity (105) is in a circular tube shape and serves as the diaphragm movement platform (110). A plurality of diaphragm guide grooves (111) are circumferentially arranged on the front end face of the diaphragm movement platform (110), and are connected to the diaphragm slide (402) on the diaphragm (401) through the diaphragm guide grooves (111).

3. The self-driven regulation tail spray mechanism for recoilless guns according to claim 1, characterized in that: The actuating piston (6) is in the form of a two-stage circular tube. The inner diameter of the front-stage inner cavity is smaller than that of the rear stage. Inner sealing grooves (602) and outer sealing grooves (603) of the same size are provided inside and outside the front stage. Two outer sealing grooves (603) are provided on the outside, and sealing rings (7) are installed. Spiral sliding grooves (601) penetrating inside and outside are arranged in a circumferential array on the rear stage and cooperate with spiral sliding platforms (502) arranged circumferentially on the driving disc (5) to convert the axial movement of the actuating piston (6) into the radial movement of the diaphragm (401) of the dynamic throttle film group (4).

4. The self-driven regulation tail spray mechanism for a recoilless gun according to any one of claims 1-3, characterized in that: During the ignition stage at the initial stage of launching, the projectile body (8) moves forward along the axis of the launcher tube (1) under the action of the gas pressure in the gun chamber (102). The actuating piston (6) overcomes the elastic force of a certain return spring (3) and actuates forward along the axis of the launcher tube (1), drives the driving disc (5) to rotate through the spiral sliding groove (601), so that the dynamic throttle film group (4) is linked to control a certain opening degree. As the actuating piston (6) continuously actuates, the opening degree of the dynamic throttle film group (4) also increases accordingly.

5. The self-driven regulation tail nozzle mechanism for a recoilless gun according to any one of claims 1-3, characterized in that: After the projectile body (8) leaves the muzzle aftereffect stage, the gas pressure in the gun chamber (102) rapidly decreases, and the acting force of the gas on the actuating piston (6) is less than the elastic force of the return spring (3), causing the actuating piston (6) to actuate reversely along the axis, drives the driving disc (5) to rotate reversely through the spiral sliding groove (601), so that the dynamic throttle film group (4) is linked to reduce the opening degree. As the actuating piston (6) returns to the initial position under the action of the elastic force of the return spring (3), the dynamic throttle film group (4) also returns to the closed state.

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