Barrier breaking bomb based on plastic-based framework and gradient metal powder and paraffin mixture and preparation method of barrier breaking bomb

Abstract

The invention discloses a barrier breaking bomb based on a plastic-based framework and a gradient metal powder and paraffin mixture and a preparation method of the barrier breaking bomb, and belongs to the technical field of barrier breaking of anti-theft equipment. The method comprises the following steps: preparing a hollow plastic-based framework; melting solid paraffin into liquid, and uniformly stirring the liquid with tungsten alloy powder to obtain a first mixture; melting solid paraffin into liquid, and uniformly stirring the liquid and lead alloy powder to obtain a second mixture; melting solid paraffin into liquid, and uniformly stirring the liquid and the iron alloy powder to obtain a third mixture; after the hollowed-out plastic-based framework is loaded into a barrier breaking bomb mold, the first mixture is poured into the hollow-out plastic-based framework and then condensed and cured, and a first layer is obtained; pouring the second mixture onto the first layer, and condensing and curing to obtain a second layer; pouring the third mixture onto the second layer, and condensing and curing to obtain a third layer; and condensing and curing the top cover on the third layer. According to the barrier breaking bomb, the anti-theft wooden door can be efficiently damaged on the basis that the safety of the surrounding environment and personnel is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of barrier-breaking of anti-theft devices, and in particular relates to an obstacle-breaking bomb based on a plastic-based skeleton and a gradient metal powder and paraffin mixture, and a preparation method thereof. Background Art

[0002] In everyday life, anti-theft devices (such as security wooden doors) are widely used in various buildings and facilities, playing a key role in protecting people and property. However, in special situations such as firefighting and law enforcement operations, a quick and efficient method to destroy security wooden doors is urgently needed to meet emergency rescue needs or successfully carry out missions.

[0003] Currently, existing methods for destroying security wooden doors include physical destruction and blasting. Physical destruction (using manual tools like crowbars and hammers) takes a long time, is inefficient, and requires high physical fitness from the operator. This makes it difficult to effectively break through the structurally strong security wooden doors in a short period of time. Blasting (using 22mm rifle grenades) is also difficult to effectively break through metal security doors, and the fragmented bullets easily rebound, potentially injuring nearby personnel or hostages behind the door, posing a significant safety hazard. Summary of the Invention

[0004] One of the purposes of the present invention is to provide a method for preparing an obstacle-breaking bomb based on a plastic-based skeleton and a gradient metal powder and paraffin mixture. The obstacle-breaking bomb prepared by this method can efficiently destroy anti-theft wooden doors while ensuring the safety of the surrounding environment and personnel, and is suitable for emergency obstacle-breaking operations in special scenarios.

[0005] The second purpose of the present invention is to provide an obstacle-breaking bomb based on a plastic-based skeleton and a gradient metal powder and paraffin mixture.

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

[0007] A method for preparing an obstacle-breaking bomb based on a plastic-based skeleton and a gradient metal powder and paraffin mixture, the method comprising the following steps:

[0008] Step S1: Using a light-curing 3D printing method, the bright resin powder is exposed to light at 22-26° C. for 2-3 seconds to obtain a hollow plastic base skeleton;

[0009] Step S2: Cut the solid paraffin into particles, place them in a container, heat them to 83-87° C., and melt them into liquid. Then, add the tungsten alloy powder and stir them evenly to obtain a first mixture.

[0010] Step S3, cutting the solid paraffin into particles, placing the particles in a container, heating the container to 83-87° C., and melting the mixture into a liquid. Then, adding the lead alloy powder, stirring the mixture evenly, and obtaining a second mixture.

[0011] Step S4, cutting the solid paraffin into particles, placing the particles into a container, heating the container to 83-87° C., and melting the mixture into a liquid; then adding the iron alloy powder and stirring the mixture to obtain a third mixture;

[0012] Step S5: After the hollow plastic-based skeleton is placed in a cylindrical inner cavity mold, the first mixture is poured into the cylindrical inner cavity mold and condensed and solidified to obtain a plastic-based skeleton and a first layer of a gradient metal powder and paraffin mixture;

[0013] Step S6: pouring the second mixture onto the first layer and solidifying it by condensation to obtain a second layer of a plastic-based skeleton and a gradient metal powder and paraffin mixture;

[0014] Step S7, pouring the third mixture onto the second layer and solidifying it by condensation to obtain a third layer of a plastic-based skeleton and a gradient metal powder and paraffin mixture;

[0015] Step S8: performing top cover condensation and solidification on the third layer of the plastic-based skeleton and the gradient metal powder and paraffin mixture to obtain an obstacle-breaking bomb based on the plastic-based skeleton and the gradient metal powder and paraffin mixture.

[0016] Furthermore, the porosity of the first mixture, the second mixture and the third mixture is no more than 0.05%, and the fracture strength is greater than or equal to 21 MPa.

[0017] Furthermore, the weight ratio of the first mixture, the second mixture and the third mixture is 5-6:3.5:12-14.

[0018] Furthermore, in the step S1, the particle size of the bright resin powder is less than or equal to 100 μm; and the layer thickness of the light-curing 3D printing is 0.01 to 0.15 mm.

[0019] Furthermore, in the step S1, each of the network meridians on the hollow plastic-based skeleton is arranged in a spiral with equal angles to the center;

[0020] In the step S1, the diameter of each network meridian on the hollow plastic base skeleton is 1 to 1.5 mm;

[0021] In step S1, the shape of the hollow plastic-based skeleton is cylindrical.

[0022] Furthermore, in step S2, the weight ratio of the tungsten alloy powder to paraffin wax is 3-7:0.5;

[0023] In the step S2, the particle size of the tungsten alloy powder is less than or equal to 50 μm.

[0024] Furthermore, in step S3, the weight ratio of the lead alloy powder to the paraffin wax is 1-5:0.5;

[0025] In step S3, the particle size of the lead alloy powder is less than or equal to 50 μm.

[0026] Furthermore, in the step S4, the weight ratio of the ferroalloy powder to the paraffin wax is 9.1-13.1:2.5;

[0027] In the step S4, the particle size of the iron alloy powder is less than or equal to 50 μm.

[0028] Furthermore, in the steps S5, S6 and S7, the condensation and solidification time is 1.5 to 2.5 hours;

[0029] In step S8, the time for condensation and solidification of the top cover is 1.5 to 2.5 hours.

[0030] In order to achieve the second of the above objectives, the present invention adopts the following technical solutions:

[0031] A barrier-breaking bomb based on a plastic-based skeleton and a mixture of gradient metal powder and paraffin wax, wherein the barrier-breaking bomb is prepared using the barrier-breaking bomb preparation method described above.

[0032] In summary, the solution proposed in the present invention has the following technical effects:

[0033] The present invention utilizes a hollow plastic-based skeleton as the supporting structure of the obstacle-breaking projectile, which effectively improves the structural rigidity and strength of the obstacle-breaking projectile, and increases its failure strength peak by two times or more compared to the case without a hollow plastic-based skeleton; the present invention prepares a mixture with different functional properties (including a first mixture, a second mixture and a third mixture) by mixing solid paraffin with tungsten alloy powder, lead alloy powder and iron alloy powder respectively, forming a "gradient" structure warhead, which improves the penetration performance of the obstacle-breaking projectile while maintaining the same volume; the primary impact on the target is achieved through the low-density characteristics of the third mixture placed on the top of the warhead; the second mixture with higher density and the third mixture are used to form a gradient ... third mixture is used to form a gradient structure warhead, which improves the penetration performance of the obstacle-breaking projectile while maintaining the same volume; the third mixture is used to form a gradient structure warhead, which improves the penetration performance of the obstacle-breaking projectile while maintaining the same volume; the third mixture is used to form a gradient structure warhead, which improves the penetration performance of the obstacle-breaking projectile while maintaining the same volume; the third mixture is used to form a gradient structure warhead, which improves the penetration performance of the obstacle-breaking projectile; the third mixture is used to form a gradient structure warhead, which improves the penetration performance of the obstacle-breaking projectile A hybrid, which makes up for the insufficient armor-piercing ability of the obstacle-breaking bomb and can bluntly hit high-strength targets, ensuring that the obstacle-breaking bomb of the present invention will not automatically break up even if it withstands a launch impact speed of 400 meters per second when driven by power sources such as gunpowder and high-pressure gas, and can quickly break up into fine metal powder and fragments after hitting the target, without the risk of rebound, and the flying metal powder and fragments will not cause fatal harm to personnel, and can quickly and efficiently destroy targets such as anti-theft wooden door locks, thereby improving the door-breaking and unlocking function of the obstacle-breaking bomb. It is suitable for special forces, mobile forces and special police forces to perform tasks such as rescuing hostages, beheading leaders and clearing areas, and meets the requirements for demolishing weak obstacle targets. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] This embodiment provides a method for preparing an obstacle-breaking bomb based on a plastic-based skeleton and a gradient metal powder and paraffin mixture. The method comprises the following steps:

[0036] Step S1: Using a light-curing 3D printing method, the bright resin powder is printed and exposed at 22-26° C. for 2-3 seconds to obtain a hollow plastic-based skeleton.

[0037] The hollow plastic-based skeleton of this embodiment serves as a support structure for the obstacle-breaking bomb. The hollow plastic-based skeleton of this embodiment is made of bright resin powder with a particle size of less than or equal to 100 μm and is obtained by a light-curing 3D printing method. Each mesh meridian on the hollow plastic-based skeleton is arranged in a spiral with equal angles to the center. The diameter of each mesh meridian on the hollow plastic-based skeleton is 1 to 1.5 mm. The shape of the hollow plastic-based skeleton is cylindrical, which improves the structural stiffness and strength of the obstacle-breaking bomb and achieves the purpose of destroying anti-theft wooden door locks.

[0038] In this embodiment, the layer thickness of the light-curing 3D printing is controlled within 0.01 to 0.15 mm, which ensures the processing smoothness of the obstacle-breaking projectile and avoids uneven fracture caused by the formation of a corrugated surface or premature fracture caused by initial defects.

[0039] Step S2: Cut the solid paraffin into particles and place them in a container, heat them to 83-87° C., and melt them into liquid. Then, add tungsten alloy powder and stir them evenly to obtain a first mixture.

[0040] Step S3: Cut the solid paraffin into particles and place them in a container, heat them to 83-87° C. and melt them into liquid. Then, add the lead alloy powder and stir them evenly to obtain a second mixture.

[0041] The second hybrid body of this embodiment serves as an intermediate layer, further improving the armor-piercing capability of the obstacle-breaking projectile and at a low cost.

[0042] Step S4: Cut the solid paraffin into particles and place them in a container, heat them to 83-87° C. and melt them into liquid. Then, add the ferroalloy powder and stir them evenly to obtain a third mixture.

[0043] In order to improve the armor-piercing capability of the obstacle-breaking projectile, ensure that the obstacle-breaking projectile can withstand a launch impact velocity of 400 m / s without automatically decomposing, and achieve blunt impact damage to high-strength targets (such as the connection between the lock cylinder and the lock cylinder seat of the anti-theft wooden door), the weight ratio of tungsten alloy powder and paraffin in this embodiment is 3-7:0.5, the weight ratio of lead alloy powder and paraffin is 1-5:0.5, and the weight ratio of iron alloy powder and paraffin is 9.1-13.1:2.5.

[0044] In order to increase the degree of decomposition and fragmentation of the barrier projectile after hitting the target and avoid the generation of large pieces of rebound that may cause injury, the particle sizes of the tungsten alloy powder, lead alloy powder and iron alloy powder in this embodiment are all less than or equal to 50 μm.

[0045] Step S5: After the hollow plastic-based skeleton is loaded into an obstacle-breaking bomb mold having a cylindrical inner cavity, the first mixture is poured into the obstacle-breaking bomb mold and condensed and solidified to obtain the plastic-based skeleton and the first layer of the gradient metal powder and paraffin mixture.

[0046] This embodiment utilizes the first mixture in the first layer to efficiently bluntly strike targets with high structural strength, such as lock cores. In order to improve the internal structural uniformity of the barrier projectile, this embodiment sets the condensation and solidification time to 1.5 to 2.5 hours.

[0047] Step S6: pour the second mixture onto the first layer and solidify it by condensation to obtain a second layer of a plastic-based skeleton and a gradient metal powder and paraffin mixture.

[0048] In order to improve the uniformity of the internal structure of the obstacle-breaking projectile, the condensation and solidification time in this embodiment is 1.5 to 2.5 hours. The second mixture and the first mixture have high density, so a "gradient" structure is formed. Under the condition of unchanged volume, the gradient design has better penetration performance. The density of lead alloy powder is between tungsten alloy and iron alloy powder, and it mainly plays an auxiliary role. The second mixture of lead alloy powder and paraffin makes up for the shortcomings of the first mixture's insufficient armor-piercing ability. The remaining energy of the second mixture is used to blunt higher-intensity targets such as lock cylinders.

[0049] Step S7: pour the third mixture onto the second layer and solidify it to obtain a third layer of a plastic-based skeleton and a gradient metal powder and paraffin mixture.

[0050] In order to improve the internal uniformity of the barrier projectile, the condensation and solidification time in this embodiment is 1.5 to 2.5 hours. The third layer (i.e., the third mixture) is located on the top of the warhead. Due to its low density, it is used for primary impact and to penetrate high-strength targets such as iron sheets.

[0051] Step S8: performing top cover condensation and solidification on the third layer of the plastic-based skeleton and the gradient metal powder and paraffin mixture to obtain an obstacle-breaking bomb based on the plastic-based skeleton and the gradient metal powder and paraffin mixture.

[0052] In order to ensure that the third mixture is fully condensed and solidified in the hollow plastic-based frame, the condensation and solidification time of the top cover in this embodiment is 1.5 to 2.5 hours.

[0053] In this embodiment, the weight ratio of the first mixture, the second mixture and the third mixture is 5-6:3.5:12-14.

[0054] To ensure uniform, rapid, and consistent melting of the paraffin wax during processing, and to improve the product's molding precision and surface quality, this embodiment cuts the solid paraffin wax into particles measuring 1.5-2.5mm x 1.5-2.5mm x 1.5-2.5mm. This embodiment utilizes the adhesive properties of paraffin wax to ensure uniformity and consistency among the first mixture of tungsten alloy powder and paraffin wax in the first layer, the second mixture of lead alloy powder and paraffin wax in the second layer, and the third mixture of iron alloy powder and paraffin wax in the third layer. The plastic-based skeleton in this embodiment serves as a support, attached to the surfaces of the first, second, and third mixtures, to form a "gradient" warhead structure. This improves the penetration performance of the obstacle-breaking projectile while maintaining a constant volume.

[0055] In order to ensure the durability and impermeability of the first, second and third mixtures and extend the service life of the structure, the porosity of the first, second and third mixtures in this embodiment is no more than 0.05%.

[0056] In order to ensure that the obstacle-breaking bomb can break into small fragments after hitting the target and will not cause fatal harm to surrounding personnel, the breaking strength of the first mixture, the second mixture and the third mixture in this embodiment are all greater than or equal to 21MPa, preferably 22-24MPa, to avoid the large particle size of the broken fragments resulting in large rebound mass and speed, which may easily cause harm to surrounding personnel.

[0057] This embodiment uses a hollow plastic-based skeleton as the supporting structure of the obstacle-clearing projectile, which effectively improves the structural stiffness and strength of the obstacle-clearing projectile (such as 20-22 MPa), and makes its failure strength peak value increase by two times or more compared with the case without a hollow plastic-based skeleton; This embodiment prepares a mixture with different functional properties (including a first mixture, a second mixture and a third mixture) by mixing solid paraffin with tungsten alloy powder, lead alloy powder and iron alloy powder respectively, to form a "gradient" structure warhead, which improves the penetration performance of the obstacle-clearing projectile while maintaining the same volume; the primary impact on the target is achieved by the low-density characteristics of the third mixture placed on the top of the warhead; The second mixture and the first mixture make up for the insufficient armor-piercing ability of the obstacle-breaking bomb and can bluntly hit high-strength targets, ensuring that the obstacle-breaking bomb of this embodiment will not automatically break up even if it withstands a launch impact speed of 400 meters per second when driven by power sources such as gunpowder and high-pressure gas, and can quickly break up into fine metal powder and fragments after hitting the target without the risk of rebound, and the flying metal powder and fragments will not cause fatal harm to personnel. It can quickly and efficiently destroy targets such as anti-theft wooden door locks, improve the door-breaking and unlocking function of the obstacle-breaking bomb, and is suitable for special forces, mobile forces and special police forces to perform tasks such as rescuing hostages, beheading leaders and clearing areas, and meet the requirements for demolishing weak obstacle targets.

[0058] Example 1:

[0059] Step S1: Using a 0.01mm layer thickness, light-curing 3D printing was performed on 100μm-diameter bright resin powder at 22°C for 2 seconds. This produced a cylindrical hollow plastic skeleton with each network of meridians arranged in a spiral pattern at equal angles to the center. Each network of meridians on the hollow plastic skeleton had a diameter of 1mm.

[0060] Step S2: Cut the paraffin wax into 1.5 mm x 1.5 mm x 1.5 mm particles, place them in a container, heat them to 83°C, and melt them into a liquid. Then, add 50 μm tungsten alloy powder and stir them evenly to obtain a first mixture with a porosity of 0.05% and a fracture strength of 21 MPa. The weight ratio of the tungsten alloy powder to the paraffin wax is 3:0.5.

[0061] Step S3: Cut the paraffin wax into 1.5 mm x 1.5 mm x 1.5 mm particles, place them in a container, heat them to 83°C, and melt them into a liquid. Then, add 50 μm lead alloy powder and stir them evenly to obtain a second mixture with a porosity of 0.05% and a fracture strength of 21 MPa. The weight ratio of the lead alloy powder to the paraffin wax is 1:0.5.

[0062] Step S4: Cut the paraffin wax into 1.5 mm x 1.5 mm x 1.5 mm particles, place them in a container, heat them to 83°C, and melt them into a liquid. Then, add 50 μm iron alloy powder and stir them evenly to obtain a third mixture having a porosity of 0.05% and a fracture strength of 21 MPa. The weight ratio of the iron alloy powder to the paraffin wax is 9.1:2.5.

[0063] Step S5: After the hollow plastic-based skeleton is loaded into an obstacle-breaking bomb mold with a cylindrical inner cavity, the first mixture is poured into the obstacle-breaking bomb mold and condensed and solidified for 1.5 hours to obtain the plastic-based skeleton and the first layer of the gradient metal powder and paraffin mixture.

[0064] Step S6: pour the second mixture onto the first layer and solidify it for 1.5 hours to obtain a second layer of a plastic-based skeleton and a gradient metal powder and paraffin mixture.

[0065] Step S7: pour the third mixture onto the second layer and solidify it for 1.5 hours to obtain a third layer of a plastic-based skeleton and a gradient metal powder and paraffin mixture.

[0066] Step S8: performing top cover condensation and solidification on the third layer of the plastic-based skeleton and the gradient metal powder and paraffin mixture for 1.5 hours to obtain an obstacle-breaking bomb based on the plastic-based skeleton and the gradient metal powder and paraffin mixture.

[0067] In this embodiment, the weight ratio of the first mixture, the second mixture and the third mixture is 5:3.5:12.

[0068] The barrier projectile of this embodiment has a length of 37 mm, a diameter of 17.9 mm, an elastic modulus of 780 MPa, and a yield strength of 20 MPa. A single barrier projectile of this embodiment fired at a velocity of 400 m / s can damage the lock cylinder of one security wooden door; two barrier projectiles fired at the same velocity can damage the lock cylinders of two security wooden doors without spontaneously rupturing. After impacting the security wooden door, the rapidly ruptured metal powder and fragments do not rebound, and do not cause fatal injuries to personnel.

[0069] Example 2:

[0070] Step S1: Using a 0.15mm layer thickness, light-curing 3D printing was performed on 95μm-diameter bright resin powder at 26°C for 3 seconds. This produced a cylindrical hollow plastic skeleton with each network of meridians arranged in a spiral pattern at equal angles to the center. Each network of meridians on the hollow plastic skeleton had a diameter of 1.5mm.

[0071] Step S2: Cut the paraffin wax into granules of 2.5 mm x 2.5 mm x 2.5 mm, place them in a container, heat them to 87°C, and melt them into a liquid. Then, add tungsten alloy powder with a particle size of 45 μm and stir them evenly to obtain a first mixture with a porosity of 0.04% and a fracture strength of 24 MPa. The weight ratio of the tungsten alloy powder to the paraffin wax is 7:0.5.

[0072] Step S3: Cut the paraffin wax into granules of 2.5 mm x 2.5 mm x 2.5 mm, place them in a container, heat them to 87°C, and melt them into a liquid. Then, add lead alloy powder with a particle size of 45 μm and stir them evenly to obtain a second mixture with a porosity of 0.04% and a fracture strength of 24 MPa. The weight ratio of the lead alloy powder to the paraffin wax is 5:0.5.

[0073] Step S4: Cut the paraffin wax into granules of 2.5 mm x 2.5 mm x 2.5 mm, place the granules in a container, heat them to 87°C, and melt them into a liquid. Then, add 45 μm iron alloy powder and stir them evenly to obtain a third mixture having a porosity of 0.04% and a fracture strength of 24 MPa. The weight ratio of the iron alloy powder to the paraffin wax is 13.1:2.5.

[0074] Step S5: After the hollow plastic-based skeleton is loaded into an obstacle-breaking bomb mold with a cylindrical inner cavity, the first mixture is poured into the obstacle-breaking bomb mold and condensed and solidified for 2.5 hours to obtain the plastic-based skeleton and the first layer of the gradient metal powder and paraffin mixture.

[0075] Step S6: pour the second mixture onto the first layer and solidify it for 2.5 hours to obtain a second layer of a plastic-based skeleton and a gradient metal powder and paraffin mixture.

[0076] Step S7: pour the third mixture onto the second layer and solidify it for 2.5 hours to obtain a third layer of a plastic-based skeleton and a gradient metal powder and paraffin mixture.

[0077] Step S8: performing top cover condensation and solidification on the third layer of the plastic-based skeleton and the gradient metal powder and paraffin mixture for 2.5 hours to obtain an obstacle-breaking bomb based on the plastic-based skeleton and the gradient metal powder and paraffin mixture.

[0078] In this embodiment, the weight ratio of the first mixture, the second mixture and the third mixture is 6:3.5:14.

[0079] The barrier projectile of this embodiment has a length of 37 mm, a diameter of 17.9 mm, an elastic modulus of 780 MPa, and a yield strength of 22 MPa. A single barrier projectile of this embodiment fired at a velocity of 400 m / s can damage the lock cylinders of three security wooden doors. Two barrier projectiles of this embodiment fired at a velocity of 400 m / s can damage the lock cylinders of four security wooden doors without spontaneously rupturing. After impacting the security wooden doors, the rapidly ruptured metal powder and fragments do not rebound and do not cause fatal injuries to personnel.

[0080] Example 3:

[0081] Step S1: Using a 0.13mm layer thickness, a light-curing 3D printing method was used to print 90μm-diameter bright resin powder at 24°C for 2.5 seconds. This produced a cylindrical hollow plastic base skeleton in which each network of meridians was arranged spirally at equal angles to the center. Each network of meridians on the hollow plastic base skeleton had a diameter of 1.3mm.

[0082] Step S2: Cut the paraffin wax into 2 mm x 2 mm x 2 mm particles, place them in a container, heat them to 85°C, and melt them into a liquid. Then, add 47 μm tungsten alloy powder and stir them evenly to obtain a first mixture with a porosity of 0.03% and a fracture strength of 23 MPa. The weight ratio of the tungsten alloy powder to the paraffin wax is 5:0.5.

[0083] Step S3: Cut the paraffin wax into 2 mm × 2 mm × 2 mm particles, place them in a container, heat them to 84°C, and melt them into a liquid. Then, add lead alloy powder with a particle size of 46 μm and stir them evenly to obtain a second mixture with a porosity of 0.03% and a fracture strength of 23 MPa. The weight ratio of the lead alloy powder to the paraffin wax is 3:0.5.

[0084] Step S4: Cut the paraffin wax into 2 mm × 2 mm × 2 mm particles, place them in a container, heat them to 84°C, and melt them into a liquid. Then, add 45 μm iron alloy powder and stir them evenly to obtain a third mixture having a porosity of 0.03% and a fracture strength of 23 MPa. The weight ratio of the iron alloy powder to the paraffin wax is 11.1:2.5.

[0085] Step S5: After the hollow plastic-based skeleton is loaded into an obstacle-breaking bomb mold with a cylindrical inner cavity, the first mixture is poured into the obstacle-breaking bomb mold and condensed and solidified for 2 hours to obtain the plastic-based skeleton and the first layer of the gradient metal powder and paraffin mixture.

[0086] Step S6: pour the second mixture onto the first layer and solidify it for 2 hours to obtain a second layer of a plastic-based skeleton and a gradient metal powder and paraffin mixture.

[0087] Step S7: pour the third mixture onto the second layer and solidify it for 2 hours to obtain a third layer of a plastic-based skeleton and a gradient metal powder and paraffin mixture.

[0088] Step S8: performing top cover condensation and solidification for 2 hours on the third layer of the plastic-based skeleton and the gradient metal powder and paraffin mixture to obtain an obstacle-breaking bomb based on the plastic-based skeleton and the gradient metal powder and paraffin mixture.

[0089] In this embodiment, the weight ratio of the first mixture, the second mixture and the third mixture is 5.5:3.5:13.

[0090] The barrier projectile of this embodiment has a length of 37 mm, a diameter of 17.9 mm, an elastic modulus of 798.38 MPa, and a yield strength of 21 MPa. A single barrier projectile of this embodiment fired at a velocity of 400 m / s can damage the lock cylinders of four security wooden doors. Two barrier projectiles of this embodiment fired at a velocity of 400 m / s can damage the lock cylinders of five security wooden doors without spontaneously rupturing. After impacting the security wooden doors, the rapidly ruptured metal powder and fragments do not rebound and do not cause fatal injuries to personnel.

[0091] Example 4:

[0092] Step S1: Using a 0.12mm layer thickness, light-curing 3D printing was performed on 97μm-diameter bright resin powder at 24°C for 2.5 seconds. This produced a cylindrical hollow plastic skeleton with each network of meridians arranged in a spiral pattern at equal angles to the center. Each network of meridians on the hollow plastic skeleton had a diameter of 1.4mm.

[0093] Step S2: Cut the paraffin wax into granules of 2.2 mm x 2.2 mm x 2.2 mm, place them in a container, heat them to 84°C, and melt them into a liquid. Then, add tungsten alloy powder with a particle size of 44 μm and stir them evenly to obtain a first mixture with a porosity of 0.03% and a fracture strength of 22 MPa. The weight ratio of the tungsten alloy powder to the paraffin wax is 4:0.5.

[0094] Step S3: Cut the paraffin wax into granules of 2.2 mm x 2.2 mm x 2.2 mm, place them in a container, heat them to 86°C, and melt them into a liquid. Then, add lead alloy powder with a particle size of 48 μm and stir them evenly to obtain a second mixture with a porosity of 0.03% and a fracture strength of 322 MPa. The weight ratio of the lead alloy powder to the paraffin wax is 2:0.5.

[0095] Step S4: Cut the paraffin wax into 2.2 mm × 2.2 mm × 2.2 mm particles, place them in a container, heat them to 85°C, and melt them into a liquid. Then, add 45 μm iron alloy powder and stir them evenly to obtain a third mixture having a porosity of 0.03% and a fracture strength of 22 MPa. The weight ratio of the iron alloy powder to the paraffin wax is 12.1:2.5.

[0096] Step S5: After the hollow plastic-based skeleton is loaded into an obstacle-breaking bomb mold with a cylindrical inner cavity, the first mixture is poured into the obstacle-breaking bomb mold and condensed and solidified for 2 hours to obtain the plastic-based skeleton and the first layer of the gradient metal powder and paraffin mixture.

[0097] Step S6: pour the second mixture onto the first layer and solidify it for 2 hours to obtain a second layer of a plastic-based skeleton and a gradient metal powder and paraffin mixture.

[0098] Step S7: pour the third mixture onto the second layer and solidify it for 2 hours to obtain a third layer of a plastic-based skeleton and a gradient metal powder and paraffin mixture.

[0099] Step S8: performing top cover condensation and solidification for 2 hours on the third layer of the plastic-based skeleton and the gradient metal powder and paraffin mixture to obtain an obstacle-breaking bomb based on the plastic-based skeleton and the gradient metal powder and paraffin mixture.

[0100] In this embodiment, the weight ratio of the first mixture, the second mixture and the third mixture is 5.5:3.5:12.5.

[0101] The barrier projectile of this embodiment has a length of 37 mm, a diameter of 17.9 mm, an elastic modulus of 790 MPa, and a yield strength of 21.5 MPa. A single barrier projectile of this embodiment fired at a velocity of 400 m / s can damage the lock cylinders of two security wooden doors. Two barrier projectiles of this embodiment fired at a velocity of 400 m / s can damage the lock cylinders of three security wooden doors without spontaneously rupturing. After impacting the security wooden doors, the rapidly ruptured metal powder and fragments do not rebound and do not cause fatal injuries to personnel.

[0102] The above embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A method for preparing an obstacle-breaking bomb based on a plastic-based skeleton and a gradient metal powder and paraffin mixture, characterized in that: The method for preparing the barrier bomb comprises the following steps: Step S1: Using a light-curing 3D printing method, the bright resin powder is exposed to light at 22-26° C. for 2-3 seconds to obtain a hollow plastic base skeleton; Step S2: Cut the paraffin wax into particles and place them in a container, heating them to 83-87° C. to melt them into liquid. Then, add the tungsten alloy powder and stir them evenly to obtain a first mixture. Step S3, cutting the solid paraffin into particles, placing the particles in a container, heating the container to 83-87° C., and melting the mixture into a liquid. Then, adding the lead alloy powder, stirring the mixture evenly, and obtaining a second mixture. Step S4, cutting the solid paraffin into particles, placing the particles into a container, heating the container to 83-87° C., and melting the mixture into a liquid; then adding the iron alloy powder and stirring the mixture to obtain a third mixture; Step S5: After the hollow plastic-based skeleton is loaded into an obstacle-breaking bullet mold having a cylindrical inner cavity, the first mixture is poured into the obstacle-breaking bullet mold and condensed and solidified to obtain a first layer of the plastic-based skeleton and the gradient metal powder and paraffin mixture; Step S6: pouring the second mixture onto the first layer and solidifying it by condensation to obtain a second layer of a plastic-based skeleton and a gradient metal powder and paraffin mixture; Step S7, pouring the third mixture onto the second layer and solidifying it by condensation to obtain a third layer of a plastic-based skeleton and a gradient metal powder and paraffin mixture; Step S8: performing top cover condensation and solidification on the third layer of the plastic-based skeleton and the gradient metal powder and paraffin mixture to obtain an obstacle-breaking bomb based on the plastic-based skeleton and the gradient metal powder and paraffin mixture.

2. The method for preparing an obstacle-breaking bomb according to claim 1, characterized in that: The porosity of the first mixture, the second mixture and the third mixture is no more than 0.05%, and the fracture strength is greater than or equal to 21 MPa.

3. The method for preparing an obstacle-breaking bomb according to claim 2, characterized in that: The weight ratio of the first mixture, the second mixture and the third mixture is 5-6:3.5:12-14.

4. The method for preparing an obstacle-breaking bomb according to claim 3, characterized in that: In the step S1, the particle size of the bright resin powder is less than or equal to 100 μm; and the layer thickness of the light-curing 3D printing is 0.01 to 0.15 mm.

5. The method for preparing an obstacle-breaking bomb according to claim 4, characterized in that: In the step S1, each network of meridians on the hollow plastic-based skeleton is arranged in a spiral with equal angles to the center; In the step S1, the diameter of each network meridian on the hollow plastic base skeleton is 1 to 1.5 mm; In step S1, the shape of the hollow plastic-based skeleton is cylindrical.

6. The method for preparing an obstacle-breaking bomb according to claim 5, characterized in that: In step S2, the weight ratio of the tungsten alloy powder to paraffin wax is 3-7:0.5; In the step S2, the particle size of the tungsten alloy powder is less than or equal to 50 μm.

7. The method for preparing an obstacle-breaking bomb according to claim 6, characterized in that: In step S3, the weight ratio of the lead alloy powder to paraffin wax is 1-5:0.5; In step S3, the particle size of the lead alloy powder is less than or equal to 50 μm.

8. The method for preparing an obstacle-breaking bomb according to claim 7, characterized in that: In the step S4, the weight ratio of the ferroalloy powder to the paraffin wax is 9.1-13.1:2.5; In the step S4, the particle size of the iron alloy powder is less than or equal to 50 μm.

9. The method for preparing an obstacle-breaking bomb according to claim 8, characterized in that: In the steps S5, S6 and S7, the condensation and solidification time is 1.5 to 2.5 hours; In step S8, the time for condensation and solidification of the top cover is 1.5 to 2.5 hours.

10. An obstacle-breaking bomb based on a plastic-based skeleton and a gradient metal powder and paraffin mixture, characterized in that: The obstacle-breaking bomb is prepared by the obstacle-breaking bomb preparation method described in any one of claims 1 to 9.