Explosion killing warhead with charging cavity volume adjusting device

Abstract

The invention provides an explosion-killing warhead with a charging cavity volume adjusting device, which comprises a warhead shell, a flexible protective film is coaxially arranged in the warhead shell, high explosive is filled in the flexible protective film, a plurality of puller screws are mounted on the warhead shell, a plurality of top plates are arranged outside the flexible protective film, the puller screws are connected with the top plates, and the top plates are connected with the charging cavity volume adjusting device. And the flexible protective film, the jacking screw and the top plate jointly form a charging cavity volume adjusting device. When the warhead is in a storage state, the puller screws are unscrewed outwards at the moment, the volume of the charge cavity of the warhead is increased, and an expansion space is reserved for the high explosive; when the warhead is in a launching state, the puller screw is tightened inwards at the moment, the volume of the charge cavity of the warhead is reduced, the high explosive is tightly attached to the flexible protective film, and therefore the high explosive is fixed to the center of the metal shell, the high explosive cannot be subjected to large extrusion force, and the high explosive cannot be damaged. And therefore, cracks caused by extrusion of the high explosive are avoided, and the safety is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of anti-blast warhead design, relates to an auxiliary device of an anti-blast warhead, and particularly relates to an anti-blast warhead with a charge chamber volume regulating device. Background Art

[0002] The anti-explosive warhead is composed of a metal warhead shell and high explosives loaded inside. It relies on the blasting effect produced by the explosion of high explosives to destroy the target. When the high explosive explodes, it is converted into a large amount of high-temperature and high-pressure gas within a few tenths of a second. Under the expansion of the high-temperature and high-pressure gas, the warhead shell ruptures and generates a shock wave in the air around the warhead. The pressure of this shock wave reaches about 20GPa and the temperature reaches about 5000℃. It can damage personnel targets and lightly armored targets, and plays an important role in today's local wars.

[0003] Since the thermal expansion coefficient of high explosives is high (on the order of 10 -4 ), the thermal expansion coefficient of the metal material of the warhead shell is low (its order of magnitude is 10 -5 ), as the ambient temperature rises, the high explosive expands significantly, while the warhead shell does not expand significantly. Since the high explosive is inside the warhead shell, the expansion of the high explosive will be restricted by the metal shell, and the high explosive will be subjected to a large extrusion force. For a 600mm diameter anti-explosive warhead, cracks are likely to form inside the extruded high explosive, and cracked explosives are prone to accidental ignition risks during launch. Therefore, cracks are not allowed inside military explosives. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a detonating warhead with a charge chamber volume adjustment device to solve the technical problem in the prior art that high explosives are squeezed by the warhead shell after expansion, subjected to a large squeezing pressure, and easily cause cracks to form inside the high explosives.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0006] A explosive warhead with a charge chamber volume adjustment device comprises a warhead shell, which is a rotating body and has closed axial ends; a flexible protective film is coaxially arranged in the warhead shell, which is a rotating body, has an axial front end close to the axial front end of the warhead shell, and has an axial rear end fixed to the inner surface of the axial rear end of the warhead shell.

[0007] The enclosed space enclosed by the axial rear end of the warhead shell and the inner surface of the flexible protective film is the warhead charging cavity, which is used to fill high explosives; the thermal expansion coefficient of the high explosives is greater than the thermal expansion coefficient of the material of the warhead shell.

[0008] The warhead shell is provided with a plurality of screw holes; a plurality of top plates are fixedly arranged on the outer surface of the flexible protective film, the plurality of top plates are evenly distributed at equal intervals and have only one layer; the gap between the inner surface of the warhead shell and the outer surface of the flexible protective film is a buffer cavity, and a plurality of tightening screws are arranged in the buffer cavity; the tightening screw is provided with an external thread on the radial outer side and is installed in the screw hole, and the radial inner side of the tightening screw is close to the outer surface of the top plate.

[0009] The major diameter of the external thread of the tightening screw is 2.7-3 mm.

[0010] The present invention also includes the following technical features:

[0011] Specifically and preferably, the pre-tightening force of each tightening screw is 1200N.

[0012] Specifically and preferably, the total number of the tightening screws is 300-320.

[0013] Specifically, the flexible protective film is made of rubber.

[0014] Specifically, the plurality of screw holes are arranged in pairs and are evenly distributed at equal intervals. Two jacking screws are fixedly connected to each top plate, and the two jacking screws are respectively fixedly installed in a pair of screw holes.

[0015] Specifically, the warhead shell is divided into a warhead shell front portion, a warhead shell middle portion and a warhead shell rear end cover from front to back. The warhead shell front portion and the warhead shell middle portion are integrated, and the warhead shell rear end cover is detachably fixedly installed at the axial rear end of the warhead shell middle portion.

[0016] Specifically, the flexible protective film is divided into a flexible protective film front portion, a flexible protective film middle portion and a flexible protective film rear portion from front to back.

[0017] Compared with the prior art, the present invention has the following technical effects:

[0018] The present invention arranges a flexible protective film between the high explosive and the warhead shell of the metal material, and adjusts the outline size of the flexible protective film by means of a tightening screw and a top plate, and the flexible protective film, the tightening screw and the top plate together constitute a charge chamber volume adjustment device. When the warhead is in a storage state, the tightening screw is loosened outwards, the volume of the warhead charge chamber becomes larger, and an expansion space is reserved for the high explosive; when the warhead is in a firing state, the tightening screw is tightened inwards, the volume of the warhead charge chamber becomes smaller, so that the high explosive fits tightly with the flexible protective film, thereby fixing the high explosive at the center of the metal shell, so that the high explosive will not be subjected to a large extrusion force, thereby avoiding cracks in the high explosive due to extrusion, and ensuring safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the anti-explosive warhead with a charge chamber volume adjustment device.

[0020] Figure 2 Schematic diagram of the structure of the warhead shell and flexible protective film.

[0021] The meanings of the various numbers in the figure are: 1-warhead shell, 2-flexible protective film, 3-warhead charging chamber, 4-screw hole, 5-top plate, 6-buffer chamber, 7-tightening screw.

[0022] 101-front part of the warhead casing, 102-middle part of the warhead casing, 103-rear end cover of the warhead casing.

[0023] 201 - the front part of the flexible protective film, 202 - the middle part of the flexible protective film, 203 - the rear part of the flexible protective film.

[0024] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0025] It should be noted that, unless otherwise specified, all components, explosives and materials in the present invention are components, explosives and materials known in the art.

[0026] 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.

[0027] Example:

[0028] This embodiment provides a blasting warhead with a charge chamber volume adjustment device, such as Figure 1As shown, it includes a warhead shell 1, which is a rotating body and has closed axial ends. A flexible protective film 2 is coaxially arranged inside the warhead shell 1, which is a rotating body. The axial front end of the flexible protective film 2 is close to the axial front end of the warhead shell 1, and the axial rear end of the flexible protective film 2 is fixed on the inner surface of the axial rear end of the warhead shell 1. The enclosed space enclosed by the axial rear end of the warhead shell 1 and the inner surface of the flexible protective film 2 is a warhead charge chamber 3, which is used to fill high explosives. The thermal expansion coefficient of the high explosive is greater than the thermal expansion coefficient of the material of the warhead shell 1; a plurality of screw holes 4 are provided on the warhead shell 1; a plurality of top plates 5 are fixedly provided on the outer surface of the flexible protective membrane 2, and the plurality of top plates 5 are evenly distributed at equal intervals and have only one layer; a gap between the inner surface of the warhead shell 1 and the outer surface of the flexible protective membrane 2 is a buffer cavity 6, and a plurality of tightening screws 7 are provided in the buffer cavity 6; an external thread is provided on the radial outer portion of the tightening screw 7 and is installed in the screw hole 4, and the radial inner portion of the tightening screw 7 is close to the outer surface of the top plate 5.

[0029] In this embodiment, the warhead shell 1 is made of conventional metal known in the prior art, preferably high-strength stainless steel, which has a low thermal expansion coefficient; the high explosive is a conventional high explosive known in the prior art, and its main components include main explosives (RDX, octogen, etc.), curing agents (isocyanate curing agents or epoxy resin curing agents, etc.), aluminum powder, etc. The high explosive has a high thermal expansion coefficient, and the tightening screws 7 can alleviate the mutual extrusion force between the high explosive and the warhead shell 1 at high temperature, thereby preventing the high explosive from being squeezed out of cracks.

[0030] In this embodiment, the top plate 5 is made of conventional metal materials known in the prior art; the flexible protective film 2 is made of conventional rubber known in the prior art; both the flexible protective film 2 and the top plate 5 are flexible, and the two are directly adhered by adhesive to achieve a tight fit.

[0031] In this embodiment, the tightening screw 7 is made of conventional metal known in the prior art, preferably high-strength stainless steel.

[0032] As a specific solution of this embodiment, the major diameter of the external thread of the tightening screw 7 is 2.7 mm.

[0033] As a specific solution of this embodiment, the pre-tightening force of each tightening screw 7 is 1200N.

[0034] As a specific solution of this embodiment, a plurality of screw holes 4 are arranged in pairs and evenly distributed at equal intervals, and two top tightening screws 7 are fixedly connected to each top plate 5 , and the two top tightening screws 7 are respectively fixedly installed in a pair of screw holes 4 .

[0035] As a specific solution of this embodiment, taking high explosive with a diameter of 520 mm as an example, when the total number of the tightening screws 7 is 300 to 320, it can ensure that sufficient force is generated to resist the mutual squeezing force generated between the high explosive and the warhead shell 1 when the high explosive explodes.

[0036] As a specific solution of this embodiment, Figure 2 As shown, the warhead shell 1 is divided into a warhead shell front portion 101, a warhead shell middle portion 102 and a warhead shell rear end cover 103 from front to back, the warhead shell front portion 101 and the warhead shell middle portion 102 are integrated, and the warhead shell rear end cover 103 is detachably fixedly installed at the axial rear end of the warhead shell middle portion 102; the warhead shell front portion 101 is a hollow conical cylinder structure, the axial front end surface of the conical cylinder structure is an arc surface, and the side generatrix of the warhead shell front portion 101 is an arc line; the warhead shell middle portion 102 is a hollow cylindrical structure; and the warhead shell rear end cover 103 is a circular plate structure.

[0037] As a specific solution of this embodiment, Figure 2 As shown, the flexible protective membrane 2 is divided into a flexible protective membrane front portion 201, a flexible protective membrane middle portion 202 and a flexible protective membrane rear portion 203 from front to back; the shape of the flexible protective membrane front portion 201 is the same as that of the warhead shell front portion 101, which is a hollow conical cylindrical structure, the axial front end surface of the conical cylindrical structure is an arc surface, and the side generatrix of the flexible protective membrane front portion 201 is an arc line; the shape of the flexible protective membrane middle portion 202 is the same as that of the warhead shell middle portion 102, which is a hollow cylindrical structure; the shape of the flexible protective membrane rear portion 203 is the same as that of the warhead shell rear end cover 103, which is a circular plate structure.

[0038] The method for using the explosive warhead with the charge chamber volume adjustment device of the present invention specifically comprises the following steps:

[0039] Step 1, device assembly: assemble the flexible protective membrane 2 and the top plate 5, then assemble the flexible protective membrane 2 with the top plate 5 and the warhead shell 1, and then install the tightening screw 7 in the screw hole 4; fill the interior of the front part 201 of the flexible protective membrane and the middle part 202 of the flexible protective membrane with high explosive, and finally install the rear part 203 of the flexible protective membrane and the rear end cover 103 of the warhead shell.

[0040] Step 2, device operation: in the storage state, the tightening screw 7 is loosened outward, and a certain gap is retained between the tightening screw 7 and the outer surface of the top plate 5. After the temperature rises, the high explosive expands, and the flexible protective film 2 expands outward accordingly. Since there is a gap between the flexible protective film 2 and the warhead shell 1, the flexible protective film 2 has a certain expansion space, and the high explosive will not be strongly squeezed; in the launching state, the tightening screw 7 is tightened inward, and the tightening screw 7 presses the outer surface of the top plate 5, and the top plate 5 transmits the pressing force to the flexible protective film 2, and then to the high explosive inside, so that the high explosive is compressed and fixed in the center of the inner cavity of the warhead shell 1, ensuring that the high explosive does not jump during the launching process, and the high explosive has never been strongly squeezed, and no cracks will be generated due to squeezing.

[0041] The working principle of the explosive warhead with charge chamber volume adjustment device of the present invention is as follows:

[0042] In the prior art, the thermal expansion coefficient of high explosive is relatively high, while the thermal expansion coefficient of the warhead shell 1 made of metal is relatively low, and the warhead shell 1 and the high explosive are in direct contact. When the high explosive expands due to heat inside the warhead shell 1, the high explosive is strongly squeezed by the warhead shell 1, and is easily crushed and cracked, because the warhead shell 1 has little thermal deformation and the volume of the high explosive increases greatly after thermal expansion. After the cracks exist, hot spots are easily generated at the cracks under the launch overload, and the local heat accumulation temperature rises rapidly, resulting in accidental explosions and accidents.

[0043] In order to avoid the above phenomenon, the present invention reserves a buffer chamber 6 between the warhead shell 1 and the high explosive. In the storage state, the buffer chamber 6 is reserved for the high explosive, and the high explosive will not be squeezed by the metal shell after thermal expansion; when the live ammunition is fired, the tightening screw 7 is screwed into the screw hole 4 of the warhead shell 1, so that the tightening screw 7 presses the top plate 5, and the top plate 5 presses the flexible protective film 2, and the flexible protective film 2 presses the high explosive inwardly, so that the high explosive is fixed at the center of mass of the warhead shell 1, so that the high explosive will not jump when the warhead is fired.

[0044] The high explosive is inside the warhead shell 1, and the high explosive is loaded inside the flexible protective membrane 2. The material of the flexible protective membrane 2 is rubber, and the flexible protective membrane 2 has good elasticity. The internal size of the flexible protective membrane 2 is the loading size of the high explosive. The internal size of the flexible protective membrane 2 (that is, the volume of the warhead charging cavity 3) can be adjusted through the warhead shell 1 and the top plate 5, thereby realizing the adjustability of the loading size of the high explosive and reserving space for the thermal expansion and contraction of the high explosive.

[0045] During the design and development process of the present invention, it was considered that since the top screw 7 is made of steel and is relatively hard, while the high explosive is a non-metallic material and is relatively soft and easy to crack, the top screw 7 cannot directly contact the high explosive. In order to avoid damage to the high explosive, it is safer to allow the flexible protective film 2 made of the same relatively soft rubber material to contact the high explosive. In particular, before launching, the high explosive needs to be fixed in the position of the warhead shell 1, and the warhead shell 1 needs to be squeezed. The flexible protective film 2 squeezes the high explosive, and can be squeezed in an all-round covering manner, so that the local force will not be too large, and no fracturing damage will be caused to the high explosive.

[0046] During the design and development process of the present invention, it was considered that if the top screw 7 directly contacts the flexible protective film 2, problems would also occur. The specific reason is that the top screw 7 is relatively small and can only provide local extrusion force, while the flexible protective film 2 is relatively large in size and cannot be subjected to uniform force as a whole. Therefore, a top plate 5 made of metal is used as a medium between the top screw 7 and the flexible protective film 2. The advantage of such a design is that when one end of the top plate 5 is subjected to the extrusion force brought by the local top screw 7, and the top plate 5 transmits the local extrusion force to the flexible protective film 2, the extrusion force is uniformed because the contact area is greatly increased.

[0047] In the present invention, when the warhead is in the firing state, the top screw 7 needs to be tightened and squeezed to squeeze the top plate 5, and then the flexible protective film 2 is squeezed through the top plate 5, and then the high explosive is squeezed through the flexible protective film 2. If the pre-tightening force of the top screw 7 is too large, the high explosive is easily squeezed to produce cracks, resulting in the inability to use the explosive normally. If the pre-tightening force of the top screw 7 is too small, the high explosive is subjected to a small extrusion force, and the positioning cannot be reduced. During the firing process, the high explosive is prone to move in space. After the high explosive jumps inside the warhead shell 1, the center of mass of the warhead will change, and then the trajectory will change, which will eventually reduce the accuracy of hitting the target.

[0048] In order to avoid the above problems, the present invention has determined through a large number of experiments that when the pre-tightening force of a tightening screw 7 is 1200N, the high explosive can be compressed and fixed in the center of the warhead shell 1. In the subsequent process, the high explosive will not jump, thus ensuring the stability of the system. The high explosive will not be crushed or cracked.

[0049] During the design and development process of the present invention, it was found that the thickness of the tightening screw 7 will also have an impact on the present invention. If the major diameter of the external thread of the tightening screw 7 is too large (that is, the tightening screw 7 is too thick), the diameter of the screw hole 4 on the warhead shell 1 for assembling with the tightening screw 7 will also increase accordingly, and the screw hole 4 is equivalent to causing damage to the warhead shell 1. If the screw hole 4 is small, the impact on the warhead shell 1 is small and can be ignored, and it does not affect the normal use of the warhead shell 1. If the screw hole 4 is too large, the damage caused to the warhead shell 1 cannot be ignored. At this time, the screw hole 4 will directly cause a significant decrease in the strength of the shell. In the launch state or during flight, the shell will disintegrate due to insufficient strength, which will cause the weapon to fail.

[0050] If the major diameter of the external thread of the tightening screw 7 is too small (i.e., the tightening screw 7 is too thin), the supporting force that the tightening screw 7 can provide is small, and the tightening screw 7 will be broken after being subjected to excessive axial compression force, thereby causing the present invention to fail. The buffer chamber 6 in the present invention is to fix the high explosive at the center of the warhead shell 1 by the pre-tightening force of the tightening screw 7, so that the high explosive will not jump. During the launch and flight of the warhead, the overload of the high explosive is all applied to the tightening screw 7. If the tightening screw 7 is too thin and cannot support the force and breaks, the high explosive will jump inside the warhead shell 1, resulting in unstable center of mass and reduced ballistic accuracy.

[0051] The present invention uses partial theoretical calculations, convenes staff with relevant work experience for collective discussion, and decomposes the above problems. Each module is experimentally evaluated separately, and finally determines that when the thread major diameter of the external thread of the top screw 7 is 2.7-3mm, the above problems can be avoided, the diameter of the top screw 7 is large enough, and it will not break during the launch process, and the position of the high explosive can be fixed. The screw hole 4 assembled with the top screw 7 will not be too large, and will not cause too much damage to the strength of the warhead shell 1, ensuring that the warhead shell 1 is strong enough and the system is intact during the use of the warhead.

[0052] Through the above design, it is ensured that the design advantages of the present invention can be reflected, the functions of the present invention can be fully exerted, and the problem can be fully solved by using the present invention.

[0053] Effect verification of Example 1:

[0054] Twenty examples of the blasting warheads with charge chamber volume adjustment devices of Example 1 were processed and used according to the above steps. High explosives were loaded into the flexible protective film 2, and then the blasting warheads were placed in a high temperature box. The temperature was first raised to 70 degrees Celsius and kept for 24 hours, and then cooled to -40 degrees Celsius and kept for 24 hours. This was repeated three times. The high explosives inside the warhead shell 1 were scanned by CT, and no cracks were found. Then live ammunition was fired, and it was found that the warhead shell 1 had sufficient strength and a good structure. The above results prove that the present invention is effective.

[0055] Embodiment 2:

[0056] This embodiment provides an explosive warhead with a charge chamber volume adjustment device, which has basically the same results as those of Embodiment 1, except that in this embodiment, the major diameter of the external thread of the tightening screw 7 is 3 mm.

[0057] Effect verification of Example 2:

[0058] Twenty explosive warheads with charge chamber volume adjustment devices of Example 2 were processed and used according to the above steps. High explosives were loaded into the interior of the flexible protective film 2, and then the explosive warheads were placed in a high temperature box, first heated to 70 degrees Celsius, kept for 24 hours, then cooled to -40 degrees Celsius, kept for 24 hours, and repeated three times. The high explosives inside the warhead shell 1 were scanned by CT, and no cracks were found. Then live ammunition was fired, and it was found that the warhead shell 1 had sufficient strength and a good structure. The above results prove that the present invention is effective.

Claims

1. A blasting warhead with a charge chamber volume adjustment device, comprising a warhead shell (1), the warhead shell (1) being a rotating body, and both axial ends of the warhead shell (1) being closed; characterized in that: A flexible protective film (2) is coaxially arranged inside the warhead shell (1); the flexible protective film (2) is a rotating body; the axial front end of the flexible protective film (2) is close to the axial front end of the warhead shell (1); and the axial rear end of the flexible protective film (2) is fixed to the inner surface of the axial rear end of the warhead shell (1); The enclosed space enclosed by the axial rear end of the warhead shell (1) and the inner surface of the flexible protective film (2) is a warhead charge chamber (3), and the warhead charge chamber (3) is used to load high explosives; the thermal expansion coefficient of the high explosives is greater than the thermal expansion coefficient of the material of the warhead shell (1); The warhead shell (1) is provided with a plurality of screw holes (4); a plurality of top plates (5) are fixedly arranged on the outer surface of the flexible protective film (2), and the plurality of top plates (5) are evenly distributed at equal intervals and have only one layer; the gap between the inner surface of the warhead shell (1) and the outer surface of the flexible protective film (2) is a buffer cavity (6), and a plurality of tightening screws (7) are arranged in the buffer cavity (6); the tightening screws (7) are provided with external threads on the radial outer portion and are installed in the screw holes (4), and the radial inner portion of the tightening screws (7) is close to the outer surface of the top plate (5); The major diameter of the external thread of the tightening screw (7) is 2.7-3 mm.

2. The anti-explosion warhead with a temperature adaptive device as claimed in claim 1, characterized in that: The pre-tightening force of each tightening screw (7) is 1200N.

3. The anti-explosion warhead with a temperature adaptive device as claimed in claim 1, characterized in that: The total number of the tightening screws (7) is 300 to 320.

4. The anti-explosion warhead with a temperature adaptive device as claimed in claim 1, characterized in that: The flexible protective film (2) is made of rubber.

5. The explosive warhead with a charge chamber volume adjustment device as claimed in claim 1, characterized in that: The plurality of screw holes (4) are arranged in pairs and are evenly distributed at equal intervals. Two jacking screws (7) are fixedly connected to each top plate (5), and the two jacking screws (7) are respectively fixedly installed in a pair of screw holes (4).

6. The explosive warhead with a charge chamber volume adjustment device as claimed in claim 1, characterized in that: The warhead shell (1) is divided into a warhead shell front part (101), a warhead shell middle part (102) and a warhead shell rear end cover (103) from front to rear. The warhead shell front part (101) and the warhead shell middle part (102) are integrated, and the warhead shell rear end cover (103) is detachably fixedly mounted at the axial rear end of the warhead shell middle part (102).

7. The explosive warhead with a charge chamber volume adjustment device as claimed in claim 1, characterized in that: The flexible protective film (2) is divided into a flexible protective film front part (201), a flexible protective film middle part (202) and a flexible protective film rear part (203) from front to back.

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