Forest fire extinguishing bomb for unmanned aerial vehicle

Abstract

The invention discloses a forest fire extinguishing bomb for an unmanned aerial vehicle, and relates to the field of fire extinguishing bomb structures, the forest fire extinguishing bomb comprises a bomb body, the bomb body is filled with a fire extinguishing substance, a fuze structure is arranged at the top of the bomb body, a blasting assembly is arranged in the bomb body and extends into the fire extinguishing substance, and the blasting assembly is connected with the fuze structure; the bomb further comprises a tearing structure, and the tearing structure is arranged at the inner bottom of the bomb body, connected with the blasting assembly and capable of tearing hot air flow above the fire source. According to the forest fire extinguishing bomb for the unmanned aerial vehicle, heat convective circulation above a fire scene can be destroyed through the tearing structure after the fire extinguishing bomb explodes, so that the effective coverage area of fire extinguishing agent particles on a fire source is increased, the chemical adhesion rate on the surface of the fire source is increased, and efficient fire extinguishing and fire behavior control are achieved.

Description

Technical Field

[0001] This invention relates to the field of fire extinguishing bomb structure, specifically a forest fire extinguishing bomb for unmanned aerial vehicles (UAVs). Background Technology

[0002] Forest fire extinguishing bombs are key equipment for emergency forest fire fighting. They can reach the fire site through ground projection, airdrop, or drone delivery. They release extinguishing agents using internal explosive components, forming a covering cloud of fog to envelop the fire source, achieving rapid fire control and extinguishing. They are widely used in complex fire scenarios such as mountainous and forested areas that are difficult for ground personnel to reach, and are an important tool to supplement traditional fire fighting methods and improve fire response efficiency.

[0003] However, in actual use, the combustion of combustibles in a fire releases a large amount of heat, causing the surrounding air to rapidly expand and form rising hot air currents. Some high-intensity fires are also accompanied by thermal convection vortices. This airflow directly affects the extinguishing agent cloud formed after the fire extinguishing bomb explodes, causing the extinguishing agent cloud to be drawn upwards, creating an upward drift effect and preventing it from penetrating downwards to the base of the fire. At the same time, some extinguishing agent particles are carried into the high altitude by the hot airflow, reducing the effective coverage area and thus reducing the agent adhesion rate on the fire surface, affecting the fire extinguishing effect. Summary of the Invention

[0004] The purpose of this invention is to provide a forest fire extinguishing bomb for drones. This type of forest fire extinguishing bomb, through its tearing structure, can disrupt the thermal convection circulation above the fire after the bomb explodes, thereby increasing the effective coverage area of ​​the fire extinguishing agent particles on the fire source, improving the agent adhesion rate on the fire source surface, and achieving efficient fire extinguishing and fire control.

[0005] The above-mentioned optimized structure of the present invention is achieved through the following technical solution: a forest fire extinguishing bomb for drones, comprising a bomb body, wherein the bomb body is filled with fire extinguishing material; A fuze structure is located on the top of the projectile. An explosive assembly is disposed within the projectile body and extends into the extinguishing material, and the explosive assembly is connected to the fuse structure. It also includes a tearing structure located at the bottom of the projectile body and connected to the explosive assembly, which can tear apart the hot airflow above the fire source.

[0006] In some embodiments, the projectile body includes a cartridge case filled with fire extinguishing material; A sealing ring is provided on the top of the cartridge case, and the explosive assembly is provided at the bottom of the sealing ring, while the fuse structure is embedded at the top of the sealing ring.

[0007] In some embodiments, the projectile further includes a plurality of winglets, which are arranged in a ring on the outer wall of the sealing ring; A connecting ring is disposed on the top of the plurality of blades.

[0008] In some embodiments, the blasting assembly includes a blasting tube disposed within the projectile body, and fire extinguishing material is disposed around the blasting tube; An explosive charge assembly, which is filled inside the blast tube and connected to the fuse structure; The rupture ports are evenly spaced at the bottom of the rupture tube.

[0009] In some embodiments, the blasting assembly further includes a blasting ring, which is coaxially disposed at the bottom of the blasting tube; Multiple impact channels are arranged in a ring within the rupture ring and connected to the rupture tube. The tearing structure is provided at the end of each impact channel away from the rupture tube.

[0010] In some embodiments, the explosive assembly includes a fast-burning agent disposed inside the blast tube, with the bottom of the fast-burning agent positioned below the blast opening. A flame-retarding agent is disposed in the rupture tube below the rupture opening area and fills the impact channel.

[0011] In some embodiments, the tearing structure includes a plurality of anchors, the plurality of anchors being respectively disposed at one end of the plurality of impact channels away from the burst tube; A flame-retardant mesh is folded inside the projectile and located at the bottom opening of the blast tube.

[0012] In some embodiments, the flame-retardant mesh is connected to a plurality of the anchors.

[0013] In some embodiments, the anchor is a heavy metal ball made of tungsten alloy.

[0014] In some embodiments, the flame-retardant mesh is made of woven glass fiber.

[0015] The above-described technical solutions in the embodiments of the present invention have at least the following technical effects or advantages: After the tearing structure of this invention ruptures, the anchor moves outward, causing the flame-retardant net to unfold rapidly. The flame-retardant net covers the fire source, disrupting the heat convection cycle through physical barrier, allowing the extinguishing agent to quickly cover the fire source. This increases the effective coverage area of ​​the extinguishing agent particles on the fire source and improves the adhesion rate of the agent on the fire source surface, achieving efficient fire extinguishing and fire control. At the same time, after the flame-retardant net covers the fire source, it can prevent the fire source from transferring heat to surrounding combustibles, while also blocking the spread of burning pine needles, dry branches, and other debris, reducing the reignition rate and achieving a highly efficient and continuous fire extinguishing effect.

[0016] This invention combines fast-burning and slow-burning agents to achieve an orderly process of first spreading extinguishing materials and then deploying flame-retardant nets. This allows the tearing structure to carry some extinguishing materials, tearing the hot airflow above the fire source and thus disrupting the heat convection of the fire, achieving a better fire extinguishing effect. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional schematic diagram of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle.

[0019] In the diagram: 1. Projectile body; 11. Cartridge case; 12. Sealing ring; 13. Wing; 14. Connecting ring; 2. Fuze structure; 3. Explosive assembly; 31. Explosive tube; 32. Explosive assembly; 321. Fast-burning agent; 322. Slow-burning agent; 33. Blast port; 34. Explosive ring; 35. Impact channel; 4. Tear structure; 41. Anchor; 42. Flame retardant mesh. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] refer to Figures 1-3A type of unmanned aerial vehicle (UAV) forest fire extinguishing bomb includes a bomb body 1, a fuse structure 2, a blasting component 3, and a tearing structure 4. The bomb body 1 is the main carrier of the entire fire extinguishing bomb and is filled with fire extinguishing material, which can be a composite dry powder of sodium bicarbonate-ammonium dihydrogen phosphate-mica powder, providing the basic material basis for fire extinguishing. The fuse structure 2 is located at the top of the bomb body and is the trigger switch for the entire fire extinguishing bomb. When the fire extinguishing bomb is dropped by the UAV near the target area, the fuse structure 2 will determine whether to trigger based on preset conditions, such as the sensed temperature and waiting time. Once the triggering conditions are met, the fuse structure 2 will quickly generate a trigger signal and transmit this signal to the connected blasting component 3, thereby triggering the explosion of the blasting component 3, realizing the detonation of the fire extinguishing bomb and the dispersal of the fire extinguishing material. The fuse structure 2 may include a protective shell, an electronic fuse, a timer, a temperature sensor, and a battery. The protective shell may be a cylindrical structure made of polytetrafluoroethylene (PTFE) material, and its outer diameter is adapted to the top through hole of the sealing ring 12. It has a partitioned cavity inside to accommodate the electronic fuse, timer, temperature sensor, and battery respectively, which can avoid interference between components. The top of the protective shell may be provided with a waterproof and breathable membrane to balance the internal air pressure, prevent condensation caused by temperature difference, and prevent external moisture from entering, ensuring the dryness of the internal components. The battery is secured inside the protective casing with clips and connected in series with the power input terminal of the electronic fuse, providing continuous power to the electronic fuse and timer. The electronic fuse can be a miniature triggering device, employing semiconductor bridge ignition technology. A metal probe is located at the bottom of the electronic fuse, extending into the detonation component 3. The electronic fuse, timer, and temperature sensor are electrically connected. When the fire extinguishing projectile is released, the timer is triggered. When the timer reaches the set time or the temperature sensor detects a temperature exceeding the set value, the electronic fuse is triggered, causing the detonation component 3 to explode via the metal probe, thus releasing the fire extinguishing agent. The specific structure and working principle of the fuse structure 2 are existing technologies and will not be described in detail here. The detonation component 3 is located inside the projectile body 1 and extends into the fire extinguishing material. It is connected to the fuse structure 2. After the fuse structure 2 is triggered, the detonation component 3 explodes, scattering the fire extinguishing material inside the projectile body 1 into the fire source area, thus extinguishing the fire. The tearing structure 4 is installed at the bottom inner part of the projectile body 1 and is connected to the explosive component 3. Driven by the energy generated by the explosion of the explosive component 3, the tearing structure 4 unfolds and tears the hot airflow above the fire source, disrupting the thermal convection of the fire, thereby achieving a better fire extinguishing effect.

[0025] In some embodiments, the projectile 1 includes a cartridge case 11 and a sealing ring 12. The cartridge case 11 may be a hollow cylindrical structure made of carbon fiber reinforced composite material. The cartridge case 11 is filled with extinguishing material, and the amount of extinguishing material can be set according to actual conditions to ensure coverage area and extinguishing effect. The sealing ring 12 may be an annular cylindrical structure made of nitrile rubber. The outer diameter of the bottom is adapted to the inner diameter of the cartridge case 11. The sealing ring 12 can be sealed on the top of the cartridge case 11 by interference fit to achieve sealing of the cartridge case 11 and prevent the extinguishing material from getting wet or leaking. The bottom of the sealing ring 12 may be provided with a cylindrical groove, and the inner wall of the groove may be threaded for installing the blasting tube 31 of the blasting component 3. The top of the sealing ring 12 may be provided with a circular through hole, and the inner wall of the through hole is embedded with a sealing rubber ring for fixing the fuse structure 2, so as to achieve precise docking between the fuse structure 2 and the blasting component 3 and ensure that the fuse structure 2 can accurately trigger the blasting component 3.

[0026] The sealed assembly of the cartridge case 11 and the sealing ring 12 can protect the extinguishing material from external environmental influences (such as rain and humidity) and ensure stable extinguishing performance. On the other hand, the structural design of the sealing ring 12 enables the coaxial assembly of the fuse structure 2 and the blasting component 3, ensuring the effective transmission of the trigger signal and blasting energy and avoiding extinguishing failure due to component misalignment.

[0027] In some embodiments, to improve the stability of the fire extinguishing projectile during flight, the projectile body further includes multiple winglets 13 and a connecting ring 14. The multiple winglets 13 can be made of glass fiber reinforced plastic into a sheet structure, and the number can be 4-6. The multiple winglets 13 can be evenly distributed along the circumferential direction of the outer wall of the sealing ring 12, and can be fixed by epoxy resin adhesive. They can be integrally injection molded. The plane of the winglets 13 is perpendicular to the axis of the projectile body 1, forming a cross-shaped or star-shaped stable structure. The connecting ring 14 is located on the top of the multiple winglets 13, which can improve the connection strength between the multiple winglets 13, thereby improving the wind load resistance of the winglets 13, preventing the winglets 13 from deforming during the descent of the fire extinguishing projectile, and can also be firmly mounted on the drone through the connecting ring 14 to ensure safety during transportation and deployment.

[0028] During the descent of the fire extinguishing bomb, multiple winglets 13 can generate a certain amount of air resistance, reduce the interference of airflow on the descent trajectory, maintain the fire extinguishing bomb's stable flight attitude, avoid instability such as tumbling, and thus improve the accuracy of fire extinguishing bomb deployment.

[0029] In some embodiments, the blasting assembly 3 includes a blasting tube 31, an explosive assembly 32, and a blast opening 33. The blasting tube 31 is disposed inside the projectile 1 and is surrounded by extinguishing material. The blasting tube 31 may be made of aluminum alloy and has a hollow cylindrical structure. Its outer diameter is adapted to the bottom groove of the sealing ring 12. The top of the outer wall of the blasting tube 31 may have external threads that mate with the internal threads of the groove of the sealing ring 12 for easy connection. The inner wall of the blasting tube 31 may be provided with 4-6 axial guide ribs to guide the blasting gas flow to be released evenly. The explosive assembly 32 is filled inside the blasting tube 31. The metal probe of the fuse structure 2 is embedded in the explosive assembly 32 and is in full contact with the explosive assembly 32. The blast opening 33 may be a circular through hole, with 6-8 holes evenly distributed along the circumference of the lower side wall of the blasting tube 31.

[0030] When the fuse structure 2 is triggered, the explosive assembly 32 burns and generates a high-pressure gas flow. The gas flow is ejected through the blast port 33, which pushes the fire extinguishing material inside the cartridge case 11 to explode and scatter, thereby covering the fire source with the fire extinguishing material.

[0031] In some embodiments, the blasting assembly 3 further includes a blasting ring 34 and multiple impact channels 35, which can provide deployment power for the tearing structure 4. The blasting ring 34 may be made of aluminum alloy and has an annular structure. The blasting ring 34 is coaxially disposed at the bottom of the blasting tube 31 to enhance the blasting effect and guide the airflow. The blasting ring 34 has multiple impact channels 35 inside, and the axis of the impact channels 35 forms an angle of 15°-20° with the radial direction of the blasting ring 34 and is obliquely downward. The end of the impact channel 35 away from the blasting tube 31 may have an annular groove inside to fix the anchor 41 of the tearing structure 4.

[0032] When the explosive component 3 explodes, it generates a high-speed shock flow. The shock flow channel 35 can guide the airflow generated by the explosion and deliver the energy and extinguishing materials generated by the explosion to the tear structure 4, thereby providing sufficient power for the deployment of the tear structure 4.

[0033] In some embodiments, the explosive charge 32 includes a fast-burning agent 321 and a slow-burning agent 322 to achieve the staged release of explosive energy. The fast-burning agent 321 may be a potassium nitrate-sulfur-charcoal mixture with a burning rate ≥50mm / s and an ignition delay time ≤5ms. The fast-burning agent 321 fills the upper region of the blast tube 31, with its bottom 10-15mm lower than the top of the blast opening 33. The slow-burning agent 322 may be a potassium borate-polyvinyl chloride mixture with a burning rate ≤5mm / s and a burning duration ≥200ms. The slow-burning agent 322 fills the lower region of the blast tube 31 and extends into the impact channel 35, with its top in contact with the fast-burning agent 321.

[0034] When the fuse structure 2 is triggered, the fast-burning agent 321 burns rapidly, generating instantaneous high pressure, which propels the extinguishing material to be rapidly dispersed; the slow-burning agent 322 burns slowly, generating delayed airflow, which drives the tearing structure 4 to unfold. This allows for an orderly operation process of first dispersing the extinguishing material and then unfolding the flame-retardant net, so that the tearing structure 4 carries some extinguishing material, tears the hot airflow above the fire source, thereby disrupting the thermal convection of the fire and achieving a better fire extinguishing effect.

[0035] In some embodiments, the tearing structure 4 includes multiple anchors 41 and a flame-retardant net 42, used to tear the hot airflow and block flying sparks. The multiple anchors 41 are respectively disposed at the ends of multiple impact channels 35 away from the rupture tube 31, and can be embedded into the annular grooves of the impact channels 35 by interference fit. Under the action of the impact flow generated by the explosion of the rupture component 3, the anchors 41 will be ejected at high speed. They can quickly penetrate the hot airflow layer above the fire source, thereby destroying the thermal convection of the fire and facilitating the coverage of the fire source by extinguishing materials. The flame-retardant net 42 is folded inside the projectile 1 and disposed at the bottom opening of the rupture tube 31. When inside the projectile 1, the flame-retardant net 42 is in a folded state. When the rupture component 3 explodes, the impact flow ejects the anchors 41 and also drives the flame-retardant net 42 to unfold, which can further effectively tear and block the hot airflow and destroy the thermal convection conditions of the fire.

[0036] In some embodiments, the edge of the flame-retardant net 42 can be connected to multiple anchors 41 via fiberglass ropes, which can provide support points for the deployment of the flame-retardant net 42. When the airflow in the impact channel 35 pushes the anchors 41 out of the slot, the anchors 41 move radially outward. Under the support of the anchors 41, the flame-retardant net 42 is driven to deploy quickly, forming a large plane in the hot airflow layer above the fire source. The deployed flame-retardant net 42 covers the fire source, which can reduce the upward airflow speed, reduce the heat radiation transmission rate, and improve the flying fire blocking rate, thereby solving the problem that traditional fire extinguishing bombs cannot destroy the thermal convection cycle and are prone to reignition.

[0037] In some embodiments, the anchor 41 may be a heavy metal ball made of tungsten alloy. Its high density can obtain sufficient kinetic energy under the propulsion of airflow to ensure that the flame-retardant net 42 is fully deployed in a short time. Moreover, the tungsten alloy has high hardness and can withstand collisions with the ground or vegetation without damage.

[0038] In some embodiments, the flame-retardant mesh 42 may be made of fiberglass woven mesh, which has a temperature resistance of ≥600℃, a burning time of ≤3 seconds, and an afterflame time of ≤0 seconds, and can maintain structural stability in the high-temperature environment of the fire scene; the fiberglass can be naturally degraded after the fire, or recycled and processed into building materials, with no plastic residue pollution, which meets the needs of forest ecological protection.

[0039] The specific working principle is as follows: During actual firefighting, the fire extinguishing bombs are securely connected to the drone's mounting device. After the drone carrying the fire extinguishing bombs flies to a set altitude above the fire, it releases the mounting device, and the fire extinguishing bombs begin to fall under the influence of gravity.

[0040] At the moment the fire extinguishing grenade is released, the timer inside the fuse structure 2 is triggered synchronously and enters a countdown state; at the same time, the temperature sensor of the fuse structure 2 monitors the ambient temperature in real time. When the timer reaches the preset time or the temperature sensor detects that the ambient temperature exceeds the set threshold, the electronic fuse is immediately activated, and the metal probe at its bottom releases ignition energy, which is transmitted to the explosive assembly 32 of the explosive component 3 that comes into contact with it, triggering the subsequent detonation process.

[0041] The ignition energy of the electronic fuse first ignites the fast-burning agent 321 in the explosive charge 32. The rapid combustion of the fast-burning agent 321 generates an instantaneous high-pressure gas flow, which is ejected along the blast hole 33. The high-pressure gas flow propels the extinguishing agent inside the cartridge case 11 to disperse, so that the extinguishing agent evenly covers the fire source area with a radius of 3-5 meters.

[0042] When the fast-burning agent 321 burns, its heat rapidly ignites the slow-burning agent 322 below. The slow-burning agent 322 delays the release of energy, generating a high-pressure airflow. This airflow is directionally transported through the impact channel 35 within the blasting ring 34, pushing the anchor 41 at its end. Under the action of the airflow, the anchor 41 detaches from the slot and is ejected radially outward at high speed. Simultaneously, the movement of the anchor 41 causes the flame-retardant net 42 to rapidly unfold. Ultimately, the flame-retardant net 42 unfolds into a plane above the fire source. As the hot airflow rises, it encounters the flame-retardant net 42, which obstructs and tears it, altering the flow direction. The originally continuous and stable upward airflow is divided into multiple smaller streams, and its speed is significantly reduced.

[0043] Once unfolded, the flame-retardant net 42 and anchor 41 tear apart the rising hot airflow above the fire source. The mesh structure of the flame-retardant net 42 disrupts the trajectory of the hot airflow without obstructing necessary air circulation, reducing the speed of the rising airflow and disrupting the thermal convection cycle of rising hot airflow and replenishment by cold air, thus cutting off the oxygen supply to the fire source. At the same time, the scattered extinguishing agent descends and covers the surface of the fire source, inhibiting the combustion reaction through chemical inhibition, reducing the temperature of the fire source, and extinguishing the fire. After the flame-retardant net covers the fire source, it can prevent the fire source from transferring heat to the surrounding combustibles, while also blocking the spread of burning pine needles, dry branches, and other debris, reducing the reignition rate and achieving a highly efficient and continuous fire extinguishing effect.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A forest fire extinguishing bomb for unmanned aerial vehicles, comprising a bomb body (1) and said bomb body (1) being filled with fire extinguishing material; A fuse structure (2) is provided on the top of the projectile (1); The explosive assembly (3) is disposed inside the projectile (1) and extends into the extinguishing material, and the explosive assembly (3) is connected to the fuse structure (2). Its features are: It also includes a tearing structure (4), which is located at the bottom of the projectile (1) and connected to the explosive assembly (3), and can tear the hot airflow above the fire source.

2. The forest fire extinguishing bomb for unmanned aerial vehicles according to claim 1, characterized in that: The projectile (1) includes a cartridge case (11) filled with fire extinguishing material; A sealing ring (12) is provided on the top of the cartridge case (11), and the explosive assembly (3) is provided at the bottom of the sealing ring (12). The fuse structure (2) is embedded at the top of the sealing ring (12).

3. A forest fire extinguishing bomb for unmanned aerial vehicles according to claim 2, characterized in that: The projectile (1) also includes a plurality of winglets (13), which are arranged in a ring on the outer wall of the sealing ring (12); A connecting ring (14) is disposed on top of the plurality of blades (13).

4. A forest fire extinguishing bomb for unmanned aerial vehicles according to claim 1, characterized in that: The blasting component (3) includes a blasting tube (31), which is located inside the projectile (1), and fire extinguishing material is provided around the blasting tube (31). Explosive assembly (32), which is filled inside the blast tube (31) and connected to the fuse structure (2); The rupture ports (33) are evenly spaced at the bottom of the rupture tube (31).

5. A forest fire extinguishing bomb for unmanned aerial vehicles according to claim 4, characterized in that: The blasting assembly (3) also includes a blasting ring (34), which is coaxially disposed at the bottom of the blasting tube (31); Multiple impact channels (35) are arranged in a ring within the rupture ring (34) and connected to the rupture tube (31). The tearing structure (4) is provided at the end of the multiple impact channels (35) away from the rupture tube (31).

6. A forest fire extinguishing bomb for unmanned aerial vehicles according to claim 4, characterized in that: The explosive assembly (32) includes a fast-burning agent (321), which is disposed inside the blast tube (31), and the bottom of the fast-burning agent (321) is set below the blast opening (33); The slow-burning agent (322) is disposed in the area of ​​the rupture tube (31) below the rupture opening (33) and fills the impact channel (35).

7. A forest fire extinguishing bomb for unmanned aerial vehicles according to claim 5, characterized in that: The tearing structure (4) includes a plurality of anchors (41), which are respectively located at one end of the plurality of impact channels (35) away from the burst tube (31); Flame-retardant mesh (42) is folded inside the projectile (1) and located at the bottom opening of the blasting tube (31).

8. A forest fire extinguishing bomb for unmanned aerial vehicles according to claim 7, characterized in that: The flame-retardant mesh (42) is connected to the plurality of anchors (41).

9. A forest fire extinguishing bomb for unmanned aerial vehicles according to claim 7, characterized in that: The anchor (41) is a heavy metal ball made of tungsten alloy.

10. A forest fire extinguishing bomb for unmanned aerial vehicles according to claim 7, characterized in that: The flame-retardant mesh (42) is made of glass fiber woven mesh.

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