An ignition system suitable for rod-shaped propellant charges with high loading density

Abstract

The present invention discloses an ignition system for rod-shaped propellant charges with high loading density, comprising a combustible central ignition tube, a rod-shaped propellant arranged on the periphery of the combustible central ignition tube, and a powder bag; the inner surface of the combustible central ignition tube and the outer surface of the rod-shaped propellant are coated with a black powder coating, and the rod-shaped propellant is fixed to the periphery of the combustible central ignition tube through the powder bag. During the operation of the combustible central ignition tube of the ignition system of the present invention, the ignition intensity at each location is equivalent, the axial ignition uniformity and ignition simultaneity are good, and the ignition reproducibility and launching safety of the propellant charge are improved; the present invention increases the speed of the combustible central ignition tube igniting the surrounding propellant charges, improves the ignition instantaneity of the propellant charge, and is conducive to obtaining a relatively stable ballistic performance.

Description

Technical Field

[0001] The invention belongs to the technical field of ignition of explosives and relates to a propellant charge ignition system, and in particular to an ignition system suitable for a rod-shaped propellant charge with high filling density. Background Art

[0002] At present, there are two main ignition systems used for propellant charges: ignition by pyrotechnics and ignition by center ignition tubes. Since the charge chamber of large-caliber artillery is long, the filling density is high, the free space is small, and the flame propagation is difficult, it is difficult to achieve simultaneous ignition of the chamber charge if the bottom pyrotechnics are used for ignition, which can easily lead to the generation of dangerous pressure waves, and in severe cases, the gun is destroyed and people are killed. The advent of the center ignition tube effectively solves the problem of simultaneous ignition of large-caliber artillery charges. Compared with the bottom pyrotechnics ignition, its ignition uniformity and simultaneity have been greatly improved. At present, there are two types of center ignition tubes that have been used in weapon systems: metal center ignition tubes and combustible center ignition tubes. The combustible center ignition tube is mainly used for combustible cartridge charges. It is used in conjunction with the combustible cartridge and has the advantages of light weight and space saving after shooting. The body of the combustible center fire transfer tube is made of nitrocellulose and auxiliary materials, with several fire holes on the tube wall. A layer of sealing lining paper is pasted on the inner surface of the combustible tube, and granular or strip ignition powder is loaded into the tube. When the primer is fired, the flame generated by it is sprayed from the bottom into the combustible center fire transfer tube, igniting the ignition powder in the tube. The ignition powder burns to produce gas. When the gas is increasing, the pressure in the tube reaches the rupture limit of the sealing lining paper, and the ignition powder gas, flame and hot particles are ejected from the fire holes on the tube body to ignite the propellant charge outside the tube. Since the ignition powder loaded in the traditional combustible center fire transfer tube is granular or strip, the ignition powder is bound to accumulate and cannot be evenly distributed in the tube body, resulting in inconsistent gas generation rates at various locations in the tube, that is, uneven ignition intensity at various locations in the tube.

[0003] For propellant charges with low filling density, due to the large porosity of the powder bed, gunpowder gas and flame can flow freely in the powder bed, offsetting the problem of uneven axial ignition of the powder bed, and the chamber usually does not produce large pressure waves. However, for propellant charges with high filling density, especially rod-shaped propellant charges, due to the small porosity of the powder bed, gunpowder gas and flame are difficult to flow freely in the powder bed, and the chamber is prone to large pressure fluctuations. In serious cases, the gun is destroyed and people are killed.

[0004] Therefore, in order to solve the problem of high-filling-density propellant charges, it is particularly important to study an ignition system suitable for high-filling-density rod-shaped propellant charges. Summary of the invention

[0005] Based on the above technical objectives, the present invention provides an ignition system suitable for high-filling-density rod-shaped propellant charges to solve the problem of uneven ignition of existing combustible central ignition tubes.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A rod-shaped propellant charge ignition system suitable for high filling density comprises a combustible central ignition tube, a rod-shaped propellant arranged on the periphery of the combustible central ignition tube, and a powder bag; the inner surface of the combustible central ignition tube and the outer surface of the rod-shaped propellant are coated with a black powder coating, and the rod-shaped propellant is fixed to the periphery of the combustible central ignition tube through the powder bag.

[0008] Preferably, the black powder coating is prepared by mixing black powder and water in a mass ratio of 1:1, and after the mixture becomes a paste, it is coated on the inner surface of the combustible central ignition tube and the outer surface of the rod-shaped propellant.

[0009] Preferably, the combustible central fire transmission tube comprises a combustible tube body and a joint, a plurality of flame-spraying holes arranged crosswise at equal intervals are arranged on the tube wall of the combustible tube body; a sealing lining paper is attached to the inner wall of the combustible tube body, the black powder coating is arranged on the inner surface of the sealing lining paper, and one end of the combustible tube body is closed and the other end is open;

[0010] The two ends of the joint are respectively used to connect the cartridge primer and the combustible tube body; the joint is a sleeve-shaped structure, a sealing plate is arranged in the sleeve, and a round hole is arranged on the sealing plate.

[0011] Preferably, the combustible pipe body is made of nitrocellulose and kraft pulp through a rolling process.

[0012] Preferably, the aperture of the flame-spraying hole is 2 mm to 6 mm.

[0013] Preferably, a black powder coating is coated on the outer surface of the rod-shaped propellant close to the combustible central fire transfer tube.

[0014] Preferably, the rod-shaped propellant is a nitrocellulose-based porous rod-shaped ring-cut propellant.

[0015] Preferably, the medicine bag is a sleeve-shaped structure made of cotton cloth.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) Since the present invention uniformly coats the inner surface of the combustible center ignition tube with a black powder coating, the black powder is uniformly distributed inside the combustible center ignition tube. Therefore, during the operation of the combustible center ignition tube, the ignition intensity at each location is equivalent, the axial ignition uniformity and ignition simultaneity are good, and the ignition reproducibility of the propellant charge and the launch safety are improved.

[0018] (2) Since the present invention coats the outer surface of the rod-shaped propellant outside the combustible central ignition tube with a black powder coating, the speed at which the combustible central ignition tube ignites the surrounding propellant charge is increased, and the ignition instantaneity of the propellant charge is improved, which is conducive to obtaining more stable ballistic performance.

[0019] Other advantages of the present invention are described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of an ignition system for a high-filling-density rod-shaped propellant charge according to an embodiment of the present invention.

[0021] Figure 2 It is a schematic diagram of the combustible central fire transfer tube structure recorded in an embodiment of the present invention.

[0022] Figure 3 It is a high-speed photographic image of the ignition process using a certain standard ignition system.

[0023] Figure 4 It is a high-speed photographic image of the ignition process using the ignition system of the present invention.

[0024] The meaning of the symbols in the accompanying drawings:

[0025] 1- combustible center ignition tube, 2- rod-shaped propellant, 3- black powder coating, 4- powder bag;

[0026] 11-combustible tube body, 12-joint, 13-flame-spraying hole, 14-end cover, 15-round hole, 16-external thread. DETAILED DESCRIPTION

[0027] In the description of the invention, unless otherwise clearly specified and limited, the terms such as "set" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integrated connection; it can be a direct connection or an indirect connection, etc. For ordinary technicians in this field, the specific meanings of the above terms in this technical solution can be understood according to the specific circumstances. In the absence of any contrary instructions, the directional words used, such as "upper, lower, bottom, top", are usually defined based on the drawings of the corresponding drawings, and "inside and outside" are defined based on the outline of the corresponding drawings.

[0028] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that the terms "include" and "have" and any variation thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0030] The specific embodiment of the present invention discloses an ignition system suitable for high-filling density rod-shaped propellant charge, such as Figure 1 As shown, it includes a combustible central ignition tube 1, a rod-shaped propellant 2 and a powder bag 4. The rod-shaped propellant 2 is evenly arranged in the circumferential direction of the combustible central ignition tube 1 and fixed around the combustible central ignition tube 1 through the powder bag 4. The rod-shaped propellant 2 is used to relay ignite the flame ejected from the flame hole of the combustible central ignition tube 1.

[0031] The inner surface of the combustible center fire transmission tube 1 is coated with a black powder coating 3. Since the black powder is evenly distributed in the combustible center fire transmission tube 1, during the operation of the combustible center fire transmission tube 1, the ignition intensity at each location is equal, and the axial ignition uniformity and ignition simultaneity are good.

[0032] A black powder coating 3 is coated on the outer surface of the rod-shaped propellant 2 close to the combustible central ignition tube 1. Since black powder is easier to ignite under low pressure conditions and burns faster, coating it on the outer surface of the rod-shaped propellant increases the speed at which the combustible central ignition tube 1 ignites the surrounding propellant charges and improves the ignition instantaneity of the propellant charges. Of course, the black powder coating 3 can also be coated on the entire outer surface of the rod-shaped propellant 2, but experiments have found that the difference in the effects of the two solutions is not obvious, so it is preferred to coat the black powder 3 on the outer surface of the rod-shaped propellant 2 close to the combustible central ignition tube 1, which can simplify the process.

[0033] The thickness of the black powder coating 3 on the inner surface of the combustible central fire transmission tube 1 of the present invention is determined according to the actual charging demand. The greater the charging demand, the more black powder, the thicker the coating thickness, and vice versa.

[0034] In this embodiment, the black powder coating 3 is made by mixing black powder and water in a mass ratio of 1:1. After the mixture becomes a paste, it is coated on the inner surface of the combustible central ignition tube 1 and the outer surface of the rod-shaped propellant 2, and can be used after drying for 48 hours.

[0035] In this embodiment, the combustible central fire transmission tube 1 includes a combustible tube body 11 and a joint 12. Figure 2 As shown, the combustible tube body 11 is made of nitrocellulose and kraft pulp through a rolling process. A plurality of flame-spraying holes 13 are arranged crosswise at equal intervals on the tube wall of the combustible tube body 11, and the aperture of the flame-spraying holes 13 is 2 mm to 6 mm. A sealing lining paper is attached to the inner wall of the combustible tube body 11 to block the flame-spraying holes 13. The sealing lining paper is kraft paper and is fixed to the inner wall of the combustible tube body 11 by an adhesive. A black powder coating 3 is arranged on the inner surface of the sealing lining paper.

[0036] The combustible tube body 11 is closed at one end and open at the other end, and is specifically closed by an end cap 14, which is a cover made of a celluloid sheet. An adhesive is first applied to the inner surface of the top of the combustible tube body, and then the cover is pressed against the top of the combustible tube body to ensure that the tube is in a sealed state at the initial stage of operation. Of course, other end caps made of materials that can burn cleanly can also be used to seal the top of the combustible tube body 11, but the process of the present invention is relatively simple, and the celluloid sheet contains nitrocellulose that can burn cleanly, so the scheme of the present invention is preferred.

[0037] The two ends of the joint 12 are respectively connected to the cartridge primer and the combustible tube body 11. The function of the joint 12 is to tightly connect the combustible tube body 11 with the cartridge so that the heat impulse flame, hot particles and high-temperature gas released by the primer can pass through the joint 12 and enter the cavity of the combustible tube body 11.

[0038] In this embodiment, the joint 12 is a sleeve-shaped structure, a plugging plate is arranged inside the sleeve, and the plugging plate can be integrated with the end of the sleeve. A circular hole 15 with a diameter of about 2 mm is arranged on the plugging plate, and the heat impulse released by the primer can pass through the circular hole 15 and evenly enter the combustible pipe body 11.

[0039] An external thread 16 is provided at one end of the sleeve, which is threadedly connected to the cartridge primer. The outer diameter of the end of the sleeve connected to the combustible tube body is larger than the inner diameter of the combustible tube body 11, so that it can be inserted into the combustible tube body 11 to achieve fixed connection.

[0040] The rod-shaped propellant 2 is a nitrocellulose-based porous rod-shaped ring-cutting propellant. The rod-shaped propellant with a porous structure can be filled with more mass in a limited volume, and the porous structure can burn cleanly. The rod-shaped propellant 2 of this embodiment is a 19-hole rod-shaped ring-cutting propellant made of nitrocellulose, nitroglycerin and RDX. The medicine bag 4 is a sleeve-shaped structure made of cotton cloth, similar to a sleeve structure. The cotton cloth material is breathable, can release the burning gas, and can burn cleanly.

[0041] The following is a test result obtained with reference to an embodiment of the present invention.

[0042] The performance comparison test was conducted using the ignition system of the above embodiment of the present invention and a certain standard ignition system (a combustible ignition tube 4 / 10-85, a rod-shaped ring-cut propellant with no black powder coating on the surface fixed by a powder bag on the periphery). The ignition pressure difference (ignition uniformity) of the head and tail holes of the two ignition systems under static open conditions and the ignition speed of the peripheral charge were tested by a piezoelectric pressure sensor and a high-speed camera.

[0043] Table 1 shows the ignition pressure difference between the head and tail holes of the two schemes and the analysis of the high-speed photography results of the ignition process. Compared with the standard ignition system, the ignition pressure difference between the head and tail holes of the ignition system of the present invention is small, the speed of igniting the peripheral charge is fast, and the three tests are normal. The hole spraying is good, and the axial ignition uniformity and ignition simultaneity are good. Figure 3 and Figure 4 Shown are high-speed photographs of the ignition of the two systems.

[0044] Table 1 Comparison of test results of the embodiment of the present invention and a certain standard ignition system

[0045]

[0046] It can be seen that the ignition system of the present invention has good ignition uniformity, fast ignition of peripheral charge, and good combustion simultaneity.

Claims

1. An ignition system for a rod-shaped propellant charge with a high loading density, comprising a combustible central ignition tube (1) and a rod-shaped propellant charge (2) arranged on the periphery of the combustible central ignition tube (1), characterized in that: Also included is a medicine bag (4); The inner surface of the combustible central ignition tube (1) and the outer surface of the rod-shaped propellant (2) are both coated with a black powder coating (3), and the rod-shaped propellant (2) is fixed to the periphery of the combustible central ignition tube (1) through the propellant bag (4); The black powder coating (3) is prepared by mixing black powder and water in a mass ratio of 1:1, and after the mixture becomes a paste, it is coated on the inner surface of the combustible central ignition tube (1) and the outer surface of the rod-shaped propellant (2); The combustible central fire transmission tube (1) comprises a combustible tube body (11) and a joint (12); a plurality of flame-spraying holes (13) arranged crosswise at equal intervals are arranged on the tube wall of the combustible tube body (11); a sealing lining paper is affixed to the inner wall of the combustible tube body (11); the black powder coating (3) is arranged on the inner surface of the sealing lining paper; one end of the combustible tube body (11) is closed and the other end is open; The two ends of the joint (12) are respectively used to connect the cartridge primer and the combustible tube body (11); the joint (12) is a sleeve-shaped structure, a sealing plate is arranged inside the sleeve, and a circular hole (15) is arranged on the sealing plate; The diameter of the flame-spraying hole (13) is 2 mm to 6 mm; A black powder coating (3) is coated on the outer surface of a rod-shaped propellant (2) that is in close contact with the combustible central ignition transmission tube (1).

2. The ignition system for high-density rod-shaped propellant charge according to claim 1, characterized in that: The combustible pipe body (11) is made of nitrocellulose and kraft pulp through a rolling process.

3. The ignition system for high-density rod-shaped propellant charge according to claim 1, characterized in that: The rod-shaped propellant (2) is a nitrocellulose-based porous rod-shaped ring-cut propellant.

4. The ignition system for high-filling-density rod-shaped propellant charge according to claim 1, characterized in that: The medicine bag (4) is a sleeve-shaped structure made of cotton cloth.

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