CN113945125A

CN113945125A - Thick-shell explosive elements prevent accidental loosening of the reinforcing cap and its internal charge

Info

Publication number: CN113945125A
Application number: CN202111088456.4A
Authority: CN
Inventors: 王雨时; 钱海军; 王光宇
Original assignee: Nanjing University of Science and Technology
Current assignee: Nanjing University of Science and Technology
Priority date: 2021-09-16
Filing date: 2021-09-16
Publication date: 2022-01-18

Abstract

The invention discloses a structure for preventing a reinforcing cap and the medicine contained in the reinforcing cap from accidentally loosening for a thick-shell explosive element, which comprises a thick-shell explosive element tube shell, a reinforcing cap, the medicine filled in the cap and pressed medicine filled; the shell of the thick-shell explosive element is provided with a blind hole from top to bottom, the opening part of the reinforcing cap is coaxially arranged in the blind hole of the shell of the thick-shell explosive element from bottom to top, a cavity is formed between the blind hole and the reinforcing cap, and the inside of the cavity is sequentially provided with cap-in explosive charge and press-fit explosive charge from top to bottom; the bottom of the blind hole of the shell of the thick-shell explosive element is provided with a circle of ring groove, and the ring groove has quasi-fluid property before compression charge compaction, so that in the process of compression charge of the reinforcing cap along the inner wall of the shell of the thick-shell explosive element, the opening part of the reinforcing cap can expand outwards along the radial direction and extend into the ring groove of the shell of the thick-shell explosive element to form a snap ring structure in cooperation with the inner wall of the ring groove, and accidental loosening caused by shock, collision, falling and the like when fuse service treatment is carried out on the reinforcing cap and the internal medicine of the reinforcing cap are structurally avoided.

Description

Reinforced cap for preventing thick shell explosive element from accidentally loosing its internal medicine

Technical Field

The invention belongs to the technical field of fuzes and ammunitions, and particularly relates to a reinforcing cap for preventing a thick-shell explosive element and a structure for preventing the explosive in the reinforcing cap from accidentally loosening.

Background

The closing structure of the existing fuse and ammunition explosive element enables parts such as a cover plate, a reinforcing cap and the like for sealing the explosive element charge to be structurally closed and axially fixed by a tube shell, so that the purposes of preventing the explosive element charge from falling and loosening and further preventing the internal charge from loosening and scattering are achieved, and the problems of structural safety and performance reliability of the explosive element are fundamentally improved. At present, most thin shell sensitive explosive elements have adopted a closed-end structure. However, for thick-shell explosive elements, such as a detonator booster, a squib, a projectile or an expansion tube and a central booster in a battle part, the requirements of the mouth structure and the interface shape are met, a closed structure is not adopted, and the traditional structure that the original cylindrical shell-shaped reinforcing cap is pressed into a cylindrical blind hole in the shell of the explosive element is still adopted. The reinforcing cap of the thick-shell explosive element and the charge thereof are pressed into the shell of the tube, and a positioning (fixed distance, fixed height and fixed depth) pressing process method is not generally adopted. Because if the medicine is filled repeatedly in the process of filling the medicine, the accidental fire and explosion caused by the overlarge pressure caused by the positioning pressing process are likely to happen; if the powder charge accidentally spills (dissipates) in the charging process, the preset density cannot be reached, and even the powder charge is still in a loose state, so that the use safety and power are influenced. Therefore, a constant pressure process should be used. However, the final depth (height) of the reinforcing cap obtained by the constant pressure process is not uniform and has a certain dispersion. In order not to affect reliable explosion propagation, an adjusting pad is not arranged in the fuse structure to prevent the reinforcing cap from moving and loosening in the fuse. Due to the fact that the reinforcing caps are different in material and size, explosive charging types and densities and the pipe shell aperture size precision is different, radial expansion of the pressed reinforcing caps and the difference between radial pressure generated by the radial expansion and corresponding axial friction force are large, and it is difficult to guarantee that the reinforcing caps and the explosive loaded in the reinforcing caps cannot be accidentally loosened or even fall off due to impact generated by vibration, collision, falling and the like in the service processing process. After the reinforcing cap is loosened and falls off, explosive charges in the reinforcing cap can be loosened and scattered or are easily rubbed by relative displacement, so that potential safety hazards are formed, meanwhile, the reinforcing cap is loosened and falls off, the sealing performance of a insensitive explosion element such as a booster tube to flame is easily lost, and the high-temperature high-pressure gas fire fleeing formed by accidental firing explosion of the detonator at an isolation position is enabled to pass through a gap between the reinforcing cap and a tube shell so as to accidentally ignite or detonate the charges in the tube shell of the insensitive explosion element.

Disclosure of Invention

The invention aims to provide a structure for preventing a reinforcing cap and a medicine contained in the reinforcing cap from accidentally loosening for a thick-shell explosive element, so as to improve the safety and the performance reliability of the explosive charging of a detonator.

The technical solution for realizing the purpose of the invention is as follows: a structure for preventing a reinforcing cap and a medicine contained in the reinforcing cap from accidentally loosening for a thick-shell explosive element comprises a thick-shell explosive element tube shell, a reinforcing cap, a medicine filled in the cap and a pressed medicine filled; the shell of the thick-shell explosive element is provided with a blind hole from top to bottom, the opening part of the reinforcing cap is coaxially arranged in the blind hole of the shell of the thick-shell explosive element from bottom to top, a cavity is formed between the blind hole and the reinforcing cap, and the inside of the cavity is sequentially provided with cap-in explosive charge and press-fit explosive charge from top to bottom; the bottom of the blind hole of the shell of the thick-shell explosive element is provided with a circle of ring groove, and the ring groove has quasi-fluid characteristics before compression charging compaction, so that in the process of reinforcing the cap edge and compressing the inner wall of the shell of the thick-shell explosive element, the reinforcing cap opening part can expand outwards along the radial direction and extend into the ring groove of the shell of the thick-shell explosive element to form a snap ring structure in cooperation with the inner wall of the ring groove, and the reinforcing cap and the inner explosive in the shell are prevented from being loosened accidentally.

Furthermore, a plurality of openings are annularly distributed along the opening part of the reinforcing cap, and the opening part extends into the annular groove of the shell of the thick-shell explosive element, so that the radial expansion of the opening part of the reinforcing cap can be favorably realized in the pressing process to be clamped into the annular groove of the shell of the thick-shell explosive element.

Furthermore, the height of the charge in the cap pre-pressed in the reinforcing cap is consistent with the height of the part of the reinforcing cap without the opening, so that the part of the opening of the reinforcing cap opening can realize radial expansion at a preset position and be accurately clamped into an inner ring groove of the shell of the thick-shell explosive element in the explosive pressing process.

Compared with the prior art, the invention has the following remarkable advantages: the structure between the reinforcing cap and the shell of the thick-shell explosive element and the characteristics of the loose explosive pressing process are skillfully utilized, no additional auxiliary part is added, the original design is slightly changed, and the manufacture is convenient.

The invention is described in further detail below with reference to the figures and the detailed description.

Drawings

FIG. 1 is an axial cross-sectional view of an embodiment of a thick shell explosive element reinforcing cap and its contents accidental release prevention structure.

Detailed Description

The invention will be further described with reference to the accompanying drawings.

Referring to fig. 1, a structure for preventing a reinforcing cap and the medicine contained in the reinforcing cap from accidentally loosening for a thick-shell explosive element comprises a shell 1 of the thick-shell explosive element, a reinforcing cap 2, the medicine contained in the cap 3 and a pressed medicine 4. The thick-shell explosive elements are fuse detonating tubes, igniting tubes, expanding tubes and central tubes in the projectile or battle part.

Taking a thick-shell explosive element tube shell 1 adopting a detonator booster as an example, an opening part of a reinforcing cap 2 is downwards coaxially arranged in the booster tube shell 1 to form a cavity between the two, and a cap internal explosive 3 (for booster charge) and a pressing charge 4 (for booster charge) are sequentially arranged in the cavity from top to bottom; an annular groove is arranged at the bottom of the blind hole of the booster shell 1, 3-9 openings are preset at the opening part of the reinforcing cap 2 matched with the annular groove, the depth of each opening is matched with the height of the annular groove of the booster shell 1, and the width of each opening is as narrow as possible. The height of the medicine 3 in the reinforcing cap 2 is the same as the height of the part of the reinforcing cap 2 which is not notched.

During assembly, loose pressed explosive charges 4 are filled in the booster shell 1, and the mouth part of the reinforcing cap 2 pressed with the explosive charges 3 in the cap is downwards buckled into the booster shell 1 filled with the pressed explosive charges 4. In the process of pressing and pressing the reinforcing cap 2 axially, the loose pressed charge 4 has certain fluid characteristics before being compacted, which is equivalent to quasi fluid, and the side wall of the opening part of the reinforcing cap 2 can expand radially along the annular groove extending into the booster shell 1 to form a snap ring structure, so that the accidental loosening caused by the impact generated by vibration, collision, falling and the like when the fuse service processing is carried out on the reinforcing cap and the charge thereof is fundamentally eliminated through the structural form.

The structure and principle of the explosion expanding pipe, the central explosion pipe and the fuse fire-transmitting pipe in the projectile or the battle part are the same as those of the fuse fire-transmitting pipe.

Claims

1. A structure for preventing the accidental loosening of a reinforcing cap and its internal charge for a thick-shell explosive element, characterized in that it comprises: a thick-shell explosive element tube shell (1), a reinforcing cap (2), a charge (3) in the cap, a press fit Charge (4); the thick-shell explosive element shell (1) is provided with blind holes from top to bottom, and the reinforcing cap (2) is coaxially disposed on the blind hole of the thick-shell explosive element shell (1) with its mouth facing down. In the hole, a cavity is formed by sealing between the two, and the inner cap charge (3) and the pressing charge (4) are arranged in sequence from top to bottom in the cavity; There is a ring groove at the bottom of the hole. Since the press-fit charge (4) has quasi-fluid characteristics before being compacted, in the process of press-fit the charge by the reinforcing cap (2) along the inner wall of the shell (1) of the thick-shell explosive element, the reinforcement The mouth of the cap (2) will expand radially outward and extend into the ring groove of the thick-shell explosive element shell (1), and cooperate with the inner wall of the ring groove to form a snap ring structure, thereby preventing the reinforcement cap (2) and its internal charge from accidentally loose.

2. The structure for preventing the reinforcement cap and its internal charge from accidentally loosening for a thick-shell explosive element according to claim 1, characterized in that: a plurality of gaps are distributed annularly along the mouth of the reinforcement cap (2), and the gap extends Inserting into the ring groove of the shell (1) of the thick-shell explosive element facilitates the radial expansion of the mouth of the reinforcing cap (2) during the pressing and fitting process to be inserted into the ring groove of the shell (1) of the thick-shell explosive element.

3. The structure for preventing the accidental loosening of the reinforcing cap and its internal charge for a thick-shell explosive element according to claim 2, characterized in that: the height of the preloaded charge (3) in the reinforcing cap (2) is the same as the height of the reinforcing cap (3). The height of the unopened part of the cap (2) is the same, so that the open part of the opening of the reinforcement cap (2) can achieve radial expansion at a predetermined position during the pressing process and accurately snap into the shell (1) of the thick-shell explosive element. Ring groove.