Degradable unmanned aerial vehicle fire extinguishing agent sling bag and preparation method

Abstract

The application discloses a degradable unmanned aerial vehicle fire extinguishing agent hoisting bag and a preparation method, and belongs to the technical field of unmanned aerial vehicle forest fire extinguishing equipment. The degradable unmanned aerial vehicle fire extinguishing agent hoisting bag and the preparation method comprise a bag body mechanism, a water injection opening mechanism and a pressure relief valve mechanism. The bag body mechanism comprises a bag body. The bag body is made of a PLA and PBAT composite high-strength degradable waterproof film material. All components are made of a PLA and PBAT composite degradable material. Differentiation mechanical properties are realized by adjusting material additives according to the stress requirements of different parts. The bag can be naturally degraded after use without recycling, so that plastic garbage pollution in a forest fire site is avoided. The bag body is provided with a foldable structure. When the bag body is empty, the bag body is folded to reduce the volume and facilitate storage and transportation. After being filled, the bag body can be unfolded to be stable and self-standing. The thickened corners and the rounded corner structure disperse stress and improve the overall bearing capacity. The double hoisting structure is suitable for manual carrying and unmanned aerial vehicle mounting, and is suitable for high-altitude delivery of fire extinguishing operations.

Description

Technical Field

[0001] This invention belongs to the technical field of unmanned aerial vehicle (UAV) forest fire fighting equipment, specifically relating to a biodegradable UAV fire extinguishing agent hoisting bag and its preparation method. Background Technology

[0002] With the rapid development of smart firefighting and drone emergency rescue technologies, heavy-duty industrial drones have been widely used in fire fighting in mountainous, wild, and remote areas. With their advantages of flexible take-off and landing, no terrain restrictions, and fast response speed, they have become an important supplement to ground firefighting forces. Among them, aerial hoisting and dropping of fire extinguishing agents is one of the core operation methods.

[0003] Currently, drone-based fire extinguishing agent delivery vehicles in the industry are mainly divided into two categories, both of which have obvious technical defects, severely restricting the efficiency of forest fire fighting operations: 1. Fire extinguishing bucket: The bottom is a rigid metal structure, which is heavy and will significantly reduce the effective payload of the drone and reduce the amount of fire extinguishing agent carried. The bottom, top and opening and closing mechanism are rigid structures that cannot be folded, making storage, transportation and transfer extremely inconvenient and taking up a lot of space. During flight, the wind resistance is high and the center of gravity is unstable, which requires a high degree of precision in drone control. It is difficult for novice operators to get started and is difficult to operate.

[0004] 2. Ordinary supermarket plastic bags: While lightweight, foldable, and easy to throw, solving the problem of excessive weight of the bucket, they have significant structural defects. Ordinary plastic bags have poor load-bearing capacity, easily breaking and leaking when filled with large amounts of extinguishing agent, making them unsuitable for heavy-duty drone operations; they lack a dedicated water filling structure, making water filling cumbersome and inefficient, and prone to spillage and waste of extinguishing agent; the bags lack a fixed structure, collapsing and tipping over after filling with water, making them impossible to place independently, and cumbersome preparation work for water filling and transportation; the bag handles are weak, easily tearing and falling off during hoisting, resulting in low operational safety; furthermore, ordinary plastics are non-biodegradable, leaving plastic waste after being thrown into forests, causing pollution to the forest ecosystem, which does not meet the requirements of green firefighting operations.

[0005] In summary, there is currently a lack of a dedicated drone fire extinguishing agent carrying bag that is lightweight, foldable for storage and transportation, has strong load-bearing capacity, is easy to fill with water, can stand upright, is safe, durable, and environmentally friendly. The numerous shortcomings of existing equipment greatly limit the operational efficiency and standardization of drone forest fire fighting. Therefore, the development of a biodegradable fire extinguishing agent carrying bag that is compatible with heavy-duty drones has extremely high practical value and market demand. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a biodegradable drone fire extinguishing agent hoisting bag and its preparation method.

[0007] The technical solution adopted to solve the above technical problems is: Firstly, a technical solution is provided: a biodegradable drone fire extinguishing agent hoisting bag, characterized in that: it includes a bag body mechanism, a water inlet mechanism, and a pressure relief valve mechanism, wherein the bag body mechanism includes a bag body, the bag body being made of PLA and PBAT composite high-strength biodegradable waterproof membrane material, the side of the bag body being integrally formed with a side fold, the bottom of the bag body being integrally formed with a bottom fold, the side edge of the bag body being integrally formed with a rounded corner, and the bottom edge of the bag body being integrally formed with a reinforcing edge; The bag body mechanism has water inlet mechanisms fixed at the top of both the front and rear ends. The water inlet mechanism includes a water inlet body, and a water inlet hose is integrally connected to the bottom of the water inlet body. A pressure relief valve mechanism is fixed on the water inlet mechanism.

[0008] Furthermore, the top and front and rear ends of the bag body are provided with insert grooves, the top of the bag body is integrally formed with a lifting part, and the bag body is hot-pressed and engraved with scale marks.

[0009] Through the above technical solution, the overall structure relies on the PLA and PBAT composite high-strength biodegradable waterproof membrane substrate of the bag body to achieve an overall biodegradable and waterproof load-bearing foundation. With the integrated side folding part and bottom folding part, the bag body can be folded for storage and unfolded for filling, effectively reducing the volume in the empty state and facilitating transportation and storage. The rounded corners can effectively disperse the stress at the corners of the bag body and avoid the problem of corner tearing and damage during hoisting and filling. The reinforcing edge set at the bottom can strengthen the structural strength at the connection between the bottom and the side wall of the bag body, improving the overall load-bearing performance and standing stability. The scale mark can be used to indicate the filling amount of fire extinguishing agent. At the same time, the insertion groove opened at the top of the bag body can realize the precise insertion and positioning of the handle and lifting ring. With the integrated lifting part, the structural integrity and tensile performance of the device at the stress position of hoisting are greatly improved. The bag body structure takes into account biodegradable and environmentally friendly performance, convenient folding and storage, load-bearing stability and safety of hoisting and use, and is suitable for the hoisting and filling operation of drone fire extinguishing agent.

[0010] Furthermore, the lifting part is fitted with a handle and a lifting ring, which are made of PLA and PBAT composite high-toughness biodegradable resin material, and the assembly area of ​​the handle and lifting ring on the lifting part is thickened.

[0011] Through the above technical solutions, the handle and lifting ring made of PLA and PBAT composite high-toughness biodegradable resin can simultaneously achieve lifting load-bearing and natural degradation after disposal. The thickening treatment of the corresponding assembly area of ​​the lifting part can significantly improve the tensile strength of the connection between the lifting part and the handle and lifting ring, preventing the drone from tearing under force when lifting a fully loaded fire extinguishing agent bag. The handle is convenient for manual handling and filling, and the lifting ring can be quickly matched with the drone mounting structure, taking into account both the convenience of manual operation and the reliability of aerial lifting operations.

[0012] Furthermore, the water inlet body is made of PLA and PBAT composite high-toughness biodegradable resin material, the water inlet hose is made of thickened PLA and PBAT composite high-strength biodegradable waterproof membrane material, and the top cross-section of the water inlet hose is circular and the bottom cross-section is elliptical.

[0013] Through the above technical solution, the water inlet body structure, made of PLA and PBAT composite high-toughness biodegradable resin, has high strength, good toughness, and is completely biodegradable. Combined with the water inlet hose made of thickened PLA and PBAT composite high-strength biodegradable waterproof membrane, the overall impact resistance and waterproof sealing of the water inlet structure are effectively improved, avoiding cracking and leakage during high-pressure water injection. The irregular cross-section structure of the water inlet hose, with a round upper section and an elliptical lower section, can maintain a regular and conductive state under normal conditions. During high-pressure water injection, it can adaptively expand and deform to ensure smooth water injection. At the same time, it can buffer the impact of high-pressure water flow on the bag body and prevent the water from sloshing during drone hoisting and transportation from directly impacting the sealing cap and causing it to loosen. This allows the entire water inlet mechanism to meet environmental protection and biodegradability requirements while being suitable for the operation conditions of rapid and high-pressure filling of fire extinguishing agents.

[0014] Furthermore, the inner side of the water inlet body is integrally formed with multiple sealing protrusions, a connecting strip is integrally connected to one side of the water inlet body, and a sealing plug is integrally connected to the end of the connecting strip.

[0015] Through the above technical solution, the multi-layer sealing convex ring inside the water inlet body can fit tightly with the sealing plug to form multiple sealing barriers, preventing the extinguishing agent from leaking during hoisting. The connecting strip connects the water inlet body and the sealing plug in one piece, preventing the sealing plug from being lost separately. It limits and guides when opening and closing, and ensures accurate alignment after closing, thereby improving the overall sealing reliability and ease of use of the water inlet mechanism.

[0016] Furthermore, the sealing plug cover has multiple sealing grooves, the sealing plug cover also has an integrally formed lifting lug, and the water inlet body has an integrally formed pressure relief valve groove.

[0017] Through the above technical solution, the sealing groove on the sealing plug can be matched with the sealing protrusion on the inner side of the water inlet body to form a multi-layer sealing structure, which greatly improves the anti-leakage effect after the water inlet mechanism is closed. The lifting lug makes it easy for operators to apply force to open the sealing plug, reducing the difficulty of opening the cover. The pressure relief valve groove reserved in the water inlet body can provide a stable installation position for the pressure relief valve mechanism, realizing the integrated arrangement of the pressure relief component and the water inlet mechanism. The structure is compact and easy to assemble and use.

[0018] Furthermore, the pressure relief valve mechanism includes a tubular mounting seat that is interference-fitted into the inner side of the pressure relief valve groove. One end of the tubular mounting seat is fixed with a first valve core, which has a first cross-shaped slot. The other end of the tubular mounting seat is fixed with a second valve core, which has a second cross-shaped slot.

[0019] Through the above technical solution, the tubular mounting base is interference-fitted into the pressure relief valve groove, realizing the stable integration of the pressure relief valve mechanism and the water inlet body. The two ends are respectively equipped with a first valve core with a first cross groove and a second valve core with a second cross groove to form a double-layer pressure relief protection structure. During filling, the high-pressure gas in the bag can push open the grooves of the two valve cores to be discharged. The low-pressure impact generated by hoisting and shaking is difficult to push open the double valve cores at the same time, effectively preventing the fire extinguishing agent from leaking out. The structure is simple and the pressure relief and leakage prevention effects are taken into account at the same time.

[0020] Furthermore, the tubular mounting base is made of PLA and PBAT composite high-toughness biodegradable resin material, and the first valve core and the second valve core are both made of PLA and PBAT composite high-flexibility biodegradable elastic resin material.

[0021] Through the above technical solution, the tubular mounting base made of PLA and PBAT composite high-toughness biodegradable resin ensures that the overall installation structure of the pressure relief valve mechanism is firm and not easy to break, and is suitable for long-term hoisting conditions. The first valve core and the second valve core are made of PLA and PBAT composite high-flexibility biodegradable elastic resin, which has good rebound sealing ability. When under pressure, the cross slot can open smoothly to complete the pressure relief, and close quickly to lock after the pressure is gone. The entire pressure relief valve mechanism is made of biodegradable composite materials. After the device is put into fire extinguishing, it does not need to be recycled, can degrade naturally, and will not produce plastic pollution.

[0022] Secondly, based on the first aspect mentioned above, a method for preparing a biodegradable drone fire extinguishing agent hoisting bag is also provided, comprising the following specific steps: Step 1: Raw material proportioning and mixing. Select PLA and PBAT raw materials according to the proportion, and respectively combine them with high-strength additives, high-toughness resin additives, and flexible elastic additives. Put them into a mixer for high-temperature mixing, plasticizing and granulation to obtain bag body membrane material granules for preparing the bag body, resin granules for preparing the water inlet body, tubular mounting base, handle and lifting ring structural parts, and elastic valve core granules for preparing the first valve core and the second valve core. Step 2: Integrated molding process. The bag body is prepared by blown film and hot pressing of the bag body film particles. The side folds, bottom folds, rounded corners and reinforcing edges are stamped and formed at the same time. The lifting assembly area is thickened and hot-pressed to open the insert groove. Then, the structural resin particles are injection molded into the water inlet body, connecting strip and sealing plug. The sealing ring on the inside of the water inlet body, the sealing groove and lifting lug on the sealing plug and the pressure relief valve groove on the water inlet body are formed at the same time. The elastic valve core particles are injection molded into the first valve core with the first cross groove and the second valve core with the second cross groove, thus completing the forming of the pressure relief valve mechanism components. Step 3: Assembly and sealing. The handle and lifting ring are embedded and fixed in the mounting groove of the lifting part. The water inlet hose is heat-fused to the water inlet body. The tubular mounting seat of the pressure relief valve mechanism is interference-fitted and fixed in the pressure relief valve groove of the water inlet body. Finally, all connection parts are heat-fused and sealed for reinforcement. After passing the quality inspection, the finished biodegradable drone fire extinguishing agent lifting bag is obtained.

[0023] Furthermore, in step one, the mixing temperature is controlled at 160℃-190℃ and the plasticizing time is 15-25min. In step two, the hot pressing pressure of the bag body is 3-5MPa and the injection molding temperature is 170℃-200℃. In step three, the hot melt sealing temperature is controlled at 155℃-175℃. All molding and assembly processes are completed in a dust-free and constant temperature environment. The finished product can only be put into storage after passing the airtightness test of the bag body and the load-bearing tensile strength test of the handle and lifting ring.

[0024] Through the above technical solutions, this preparation method uses categorized raw material proportioning, graded mixing and granulation to specifically prepare special granular raw materials suitable for the bag body, various structural accessories and elastic valve cores. This precisely matches the strength, toughness and elasticity requirements of different components, ensuring a high degree of compatibility between the material performance of each component and the operating conditions. By using blown film hot pressing and integrated injection molding processes, the bag body mechanism, water inlet mechanism and pressure relief valve mechanism are simultaneously processed as a single unit, eliminating secondary processing steps. This ensures the molding accuracy and structural integrity of each folding structure, sealing structure and installation groove, effectively improving product molding quality and production efficiency. The entire preparation process is standardized and highly adaptable, enabling stable mass production of drone fire extinguishing agent lifting bags that are structurally reliable, have good sealing performance, high lifting safety and are fully biodegradable.

[0025] The beneficial effects of this invention are as follows: 1. This invention uses PLA and PBAT composite biodegradable materials for all components. The material additives are adjusted according to the stress requirements of different parts to achieve differentiated mechanical properties. After use, the whole bag can naturally degrade without recycling, avoiding plastic waste pollution in forest fires. The bag has a built-in foldable structure. When empty, it can be folded to reduce the volume for easy storage and transportation. When filled, it can be unfolded to stand stably. The thickened corners and rounded corners disperse stress and improve the overall load-bearing capacity. The matching double lifting structure can accommodate manual handling and drone mounting, making it suitable for high-altitude delivery and fire fighting operations. 2. This invention uses upper and lower irregularly shaped flexible hoses to buffer the impact of high-pressure water injection, and a multi-layer concave-convex sealing structure to improve the anti-leakage effect of the water injection port. It is equipped with a double-layer cross-grooved pressure relief valve core to smoothly expel air from the bag during filling and to prevent leakage of fire extinguishing agent during hoisting and shaking. It is equipped with a special staged granulation, one-piece molding, and hot-melt assembly process, standardized temperature and pressure control production, and finished product quality is controlled by air tightness and load-bearing capacity testing. It can mass-produce environmentally friendly, durable, and stable-filling and pressure-relieving drone fire extinguishing agent hoisting bags. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a first-view structural schematic diagram of the bag body mechanism of the present invention; Figure 3 This is a second-view structural schematic diagram of the bag body mechanism of the present invention; Figure 4 This is a schematic diagram of the invention in its folded state; Figure 5 This is a schematic diagram of the water inlet mechanism and pressure relief valve mechanism of the present invention; Figure 6 This is a three-dimensional cross-sectional view of the water inlet mechanism of the present invention; Figure 7 This is a three-dimensional cross-sectional view of the pressure relief valve mechanism of the present invention; Figure 8 This is a flowchart of the preparation method of the present invention.

[0027] Reference numerals: 1. Bag body mechanism; 101. Bag body; 102. Side fold; 103. Bottom fold; 104. Rounded corner; 105. Reinforcing edge; 106. Insertion groove; 107. Lifting part; 108. Handle; 109. Lifting ring; 110. Scale mark; 2. Water inlet mechanism; 201. Water inlet body; 202. Water inlet hose; 203. Sealing protrusion; 204. Connecting strip; 205. Sealing plug; 206. Sealing mating groove; 207. Lifting lug; 208. Pressure relief valve groove; 3. Pressure relief valve mechanism; 301. Tubular mounting base; 302. First valve core; 303. First cross slot; 304. Second valve core; 305. Second cross slot. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] like Figures 1-7As shown, a biodegradable drone fire extinguishing agent lifting bag includes a bag body mechanism 1, a water inlet mechanism 2, and a pressure relief valve mechanism 3. The bag body mechanism 1 includes a bag body 101, which is made of PLA / PBAT composite high-strength biodegradable waterproof membrane material. The side of the bag body 101 has an integrally formed side fold 102, the bottom of the bag body 101 has an integrally formed bottom fold 103, the side edges of the bag body 101 have integrally formed rounded corners 104, the bottom edge of the bag body 101 has an integrally formed reinforcing edge 105, and the top and rear ends of the bag body 101 are provided with insert grooves 106. The bag features a one-piece molded lifting section 107. The bag body 101 has heat-pressed engravings of scale marks 110. The lifting section 107 is fitted with a handle 108 and a lifting ring 109, both made of PLA / PBAT composite high-toughness biodegradable resin. The assembly area of ​​the handle 108 and lifting ring 109 on the lifting section 107 is thickened. The overall structure relies on the PLA / PBAT composite high-strength biodegradable waterproof membrane substrate of the bag body 101 to achieve overall biodegradability and waterproof load-bearing capacity. Combined with the one-piece molded side folding section 102 and bottom folding section 103, the bag can be folded for storage and unfolded for filling, effectively reducing... The bag's empty volume facilitates transport and storage. The rounded corners 104 effectively disperse stress at the bag's edges, preventing tearing and damage during lifting and filling. The reinforcing edge 105 at the bottom strengthens the connection between the bottom and sidewalls, improving overall load-bearing capacity and stability. The scale 110 indicates the amount of extinguishing agent filled. The insertion slot 106 at the top of the bag body 101 allows for precise installation and positioning of the handle 108 and lifting ring 109. Combined with the one-piece lifting section 107, this significantly enhances the structural integrity and tensile strength of the device at the lifting stress points, making the bag structure 1 both biodegradable and environmentally friendly. With its high efficiency, convenient folding and storage, load-bearing stability, and safety during hoisting, this product is suitable for the hoisting and filling operations of fire extinguishing agents by drones. The handle 108 and hoisting ring 109, made of PLA and PBAT composite high-toughness biodegradable resin, can simultaneously achieve load-bearing capacity during hoisting and natural degradation after disposal. The thickened treatment of the corresponding assembly area of ​​the lifting part 107 can significantly improve the tensile strength of the connection between the lifting part 107 and the handle 108 and hoisting ring 109, preventing tearing when the drone is hoisting a full load of fire extinguishing agent bags. The handle 108 facilitates manual handling and filling, and the hoisting ring 109 can be quickly matched with the drone's mounting structure, taking into account both the convenience of manual operation and the reliability of aerial hoisting operations.

[0030] like Figure 1 , Figure 5 and Figure 6As shown, water inlet mechanisms 2 are fixed to the top of both the front and rear ends of the bag body mechanism 1. The water inlet mechanism 2 includes a water inlet body 201, with an inlet hose 202 integrally connected to the bottom of the water inlet body 201. The water inlet body 201 is made of PLA / PBAT composite high-toughness biodegradable resin material, and the inlet hose 202 is made of thickened PLA / PBAT composite high-strength biodegradable waterproof membrane material. The top cross-section of the inlet hose 202 is circular, and the bottom cross-section is elliptical. Multiple sealing protrusions 203 are integrally formed on the inner side of the water inlet body 201. A connecting strip 204 is integrally connected to one side of the water inlet body 201, and the end of the connecting strip 204 is integrally connected to... The sealing cap 205 has multiple sealing grooves 206 and an integrally formed flap lug 207. The water inlet body 201 has an integrally formed pressure relief valve groove 208. The water inlet body 201, made of PLA / PBAT composite high-toughness biodegradable resin, has high structural strength, good toughness, and is completely biodegradable. Combined with a thickened PLA / PBAT composite high-strength biodegradable waterproof membrane material for the inlet hose 202, the overall impact resistance and waterproof sealing of the water injection structure are effectively improved, preventing cracking and leakage during high-pressure water injection. The inlet hose 202's irregular cross-section structure, with a round upper section and an elliptical lower section, allows for normal operation. The bottom maintains a regular and conductive state. During high-pressure water injection, it can adaptively expand and deform to ensure smooth water injection. At the same time, it can buffer the impact of high-pressure water flow on the bag body 101, and also prevent the water from sloshing during drone hoisting and transportation from directly impacting the sealing plug 205 and causing the sealing plug 205 to loosen. This allows the entire water inlet mechanism 2 to meet environmental protection and biodegradability requirements while adapting to the operation conditions of rapid and high-pressure filling of fire extinguishing agents. The multi-layer sealing protrusions 203 inside the water inlet body 201 can fit tightly with the sealing plug 205 to form multiple sealing barriers, preventing fire extinguishing agent leakage during hoisting. The connecting strip 204 integrally connects the water inlet body 201 and the sealing plug 205 to prevent sealing. The sealing cap 205 is lost separately. It is a limit guide when opening and closing, and the alignment is accurate after closing. It improves the overall sealing reliability and ease of use of the water inlet mechanism 2. The sealing groove 206 on the sealing cap 205 can be matched with the sealing protrusion 203 on the inner side of the water inlet body 201 to form a multi-layer sealing structure, which greatly improves the anti-leakage effect of the water inlet mechanism 2 after closing. The lifting lug 207 makes it easy for the operator to apply force to open the sealing cap 205, reducing the difficulty of opening the cap. The pressure relief valve groove 208 reserved in the water inlet body 201 can provide a stable installation position for the pressure relief valve mechanism 3, realizing the integrated arrangement of the pressure relief component and the water inlet mechanism 2. The structure is compact and easy to assemble and use.

[0031] like Figure 1 , Figure 5 and Figure 7As shown, a pressure relief valve mechanism 3 is fixed on the water inlet mechanism 2. The pressure relief valve mechanism 3 includes a tubular mounting base 301 that is interference-fitted into the inner side of the pressure relief valve groove 208. A first valve core 302 is fixed to one end of the tubular mounting base 301, and a first cross slot 303 is formed on the first valve core 302. A second valve core 304 is fixed to the other end of the tubular mounting base 301, and a second cross slot 305 is formed on the second valve core 304. The tubular mounting base 301 is made of PLA and PBAT composite high-toughness biodegradable resin material. The first valve core 302 and the second valve core 304 are both made of PLA and PBAT composite high-flexibility biodegradable elastic resin material. The tubular mounting base 301 is interference-fitted into the pressure relief valve groove 208 to achieve a stable integration of the pressure relief valve mechanism 3 and the water inlet body 201. The two ends are respectively provided with a first valve core 302 with a first cross slot 303 and a second valve core 304 with a second cross slot 305. The second valve core 304 of the cross-slotted 305 forms a double-layer pressure relief protection structure. During filling, the high-pressure gas in the bag can push open the slots of the two valve cores to discharge. The low-pressure impact generated by hoisting and shaking is difficult to push open the double valve cores at the same time, effectively preventing the fire extinguishing agent from leaking out. The structure is simple and simultaneously achieves pressure relief and leak prevention. The tubular mounting base 301, made of PLA and PBAT composite high-toughness biodegradable resin, ensures that the overall installation structure of the pressure relief valve mechanism 3 is firm and not easy to break, making it suitable for long-term hoisting conditions. The first valve core 302 and the second valve core 304 are made of PLA and PBAT composite high-flexibility biodegradable elastic resin, which has good rebound sealing ability. When under pressure, the cross slot can open smoothly to complete the pressure relief, and close quickly to lock after the pressure is gone. The entire pressure relief valve mechanism 3 is made of biodegradable composite material. After the device is put into use for fire extinguishing, it does not need to be recycled and can degrade naturally without producing plastic pollution.

[0032] like Figure 8 As shown, a method for preparing a biodegradable drone fire extinguishing agent hoisting bag includes the following specific steps: Step 1: Raw material proportioning and mixing. Select PLA and PBAT raw materials according to the proportion, and respectively combine them with high-strength additives, high-toughness resin additives, and flexible elastic additives. Put them into a mixer for high-temperature mixing, plasticizing and granulation to obtain bag body membrane granules for preparing bag body 101, structural resin granules for preparing water inlet body 201, tubular mounting seat 301, handle 108, lifting ring 109, and elastic valve core granules for preparing first valve core 302 and second valve core 304. Step 2: Integrated molding process. The bag body 101 is prepared by blown film and hot pressing of the bag body film particles. The side folding part 102, bottom folding part 103, rounded corner part 104 and reinforcing edge part 105 are simultaneously stamped. The assembly area of ​​the lifting part 107 is thickened and hot pressed to open the insert groove 106. Then, the structural resin particles are injection molded into the water inlet body 201, connecting strip 204 and sealing plug 205. The sealing convex ring 203 on the inner side of the water inlet body 201, the sealing mating groove 206 and the lifting lug 207 on the sealing plug 205 and the pressure relief valve groove 208 on the water inlet body 201 are simultaneously molded. The elastic valve core particles are injection molded into the first valve core 302 with the first cross groove 303 and the second valve core 304 with the second cross groove 305, thus completing the molding of the pressure relief valve mechanism 3 parts. Step 3: Assembly and sealing. The handle 108 and lifting ring 109 are embedded and fixed in the mounting groove 106 of the lifting part 107. The water inlet hose 202 is heat-fused to the water inlet body 201. The tubular mounting seat 301 of the pressure relief valve mechanism 3 is interference-fitted and fixed in the pressure relief valve groove 208 of the water inlet body 201. Finally, all connection parts are heat-fused and sealed. After passing the quality inspection, the finished biodegradable drone fire extinguishing agent lifting bag is obtained.

[0033] In step one, the mixing temperature is controlled at 160℃-190℃ and the plasticizing time is 15-25min. In step two, the hot pressing pressure of the bag body mechanism 1 is 3-5MPa and the injection molding temperature is 170℃-200℃. In step three, the hot melt sealing temperature is controlled at 155℃-175℃. All molding and assembly processes are completed in a dust-free and constant temperature environment. The finished product can only be put into storage after passing the airtightness test of the bag body 101 and the load-bearing tensile strength test of the handle 108 and the lifting ring 109.

[0034] This preparation method involves the proportioning and grading of raw materials by category, and the mixing and granulation to prepare specialized granular raw materials suitable for the bag body 101, various structural components, and elastic valve core. This precisely matches the strength, toughness, and elasticity requirements of different components, ensuring a high degree of compatibility between the material properties of each component and the operating conditions. Through blown film hot pressing and integrated injection molding processes, the bag body mechanism 1, water inlet mechanism 2, and pressure relief valve mechanism 3 are simultaneously processed as a single unit, eliminating secondary processing steps. This ensures the molding accuracy and structural integrity of each folding structure, sealing structure, and installation slot, effectively improving product molding quality and production efficiency. The entire preparation process is standardized, highly adaptable, and can stably mass-produce drone fire extinguishing agent lifting bags with reliable structure, good sealing performance, high lifting safety, and full biodegradability.

[0035] In use, the bag body 1 is first folded and stored when empty, with the side folds 102 folded inward and the bottom folds 103 folded upward, significantly reducing the overall volume for easy storage and transport. When it is time to fill with extinguishing agent, the side folds 102 and bottom folds 103 are unfolded, allowing the bottom fold to flatten and, with the support of the bottom edge reinforcement 105, the bag body 101 can be stably placed upright on the ground. Operators open the sealing cap 205 using the lifting lug 207, exposing the water inlet body 201. High-pressure water flows into the bag body 101 through the inlet hose 202. The irregular shape of the inlet hose 202 (round at the top and elliptical at the bottom) effectively buffers the impact of water injection. When the water pressure increases, the bottom opening automatically expands, ensuring smooth and unobstructed water injection. During water filling, the internal sealed air pressure of the bag body 101 continuously increases. The high-pressure gas can sequentially open the first valve core 302 with the first cross groove 303 and the second valve core 304 with the second cross groove 305 of the pressure relief valve mechanism 3, achieving automatic air release and pressure relief, preventing the bag body from bulging, deforming, or breaking due to pressure. When the extinguishing agent is full, excess water can overflow in a small amount through the pressure relief structure, indicating that filling is complete. After water filling, the sealing plug 205 is closed, so that the sealing convex ring 203 and the sealing mating groove 206 are tightly engaged, forming multiple sealing protections to effectively prevent extinguishing agent leakage. At the same time, the connecting strip 204 can prevent the sealing plug 205 from falling off and being lost. Subsequently, the lifting ring 109 on the lifting part 107 is used to complete the docking with the drone. The thickened structure of the lifting part 107 can significantly improve tensile strength and prevent tearing at the connection during lifting. The rounded corner part 104 can disperse the stress at the corners of the bag body and prevent the bag body 101 from breaking under high-speed movement and bumpy conditions. During the drone's flight, the slight pressure generated by the water's sloshing is insufficient to open the cross-shaped groove of the double-layer valve core, effectively preventing the extinguishing agent from sloshing and leaking. The bent, flattened structure of the inlet hose 202 also prevents water from directly impacting the sealing cap 205, further ensuring sealing stability. Once the drone reaches the fire location, it deploys the entire device. Upon impact, the device automatically ruptures, rapidly releasing the extinguishing agent and covering the fire source, completing the firefighting operation. After the operation, the entire device's bag body mechanism 1, water inlet mechanism 2, and pressure relief valve mechanism 3 are all made of PLA and PBAT biodegradable composite materials, which can degrade naturally in the environment, eliminating the need for manual recycling and completely solving the problem of environmental pollution caused by the residue of traditional fire extinguishing bags.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A biodegradable drone fire extinguishing agent transport bag, characterized in that: The bag body includes a bag body mechanism (1), a water inlet mechanism (2), and a pressure relief valve mechanism (3). The bag body mechanism (1) includes a bag body (101), which is made of PLA and PBAT composite high-strength biodegradable waterproof membrane material. The side of the bag body (101) is integrally formed with a side fold (102), the bottom of the bag body (101) is integrally formed with a bottom fold (103), the side edge of the bag body (101) is integrally formed with a rounded corner (104), and the bottom edge of the bag body (101) is integrally formed with a reinforcing edge (105). The top of both the front and rear ends of the bag body mechanism (1) are fixed with water inlet mechanisms (2). The water inlet mechanism (2) includes a water inlet body (201). The bottom of the water inlet body (201) is integrally connected with a water inlet hose (202). A pressure relief valve mechanism (3) is fixed on the water inlet mechanism (2).

2. The biodegradable drone fire extinguishing agent carrying bag according to claim 1, characterized in that, The top and front and rear ends of the bag body (101) are provided with mounting grooves (106), the top of the bag body (101) is integrally formed with a lifting part (107), and the bag body (101) is hot-pressed with scale marks (110).

3. The biodegradable drone fire extinguishing agent carrying bag according to claim 2, characterized in that, The lifting part (107) is fitted with a handle (108) and a lifting ring (109). The handle (108) and the lifting ring (109) are made of PLA and PBAT composite high toughness biodegradable resin material. The assembly area of ​​the handle (108) and the lifting ring (109) on the lifting part (107) is thickened.

4. The biodegradable drone fire extinguishing agent carrying bag according to claim 1, characterized in that, The water inlet body (201) is made of PLA and PBAT composite high toughness biodegradable resin material, and the water inlet hose (202) is made of thickened PLA and PBAT composite high strength biodegradable waterproof membrane material. The top cross-section of the water inlet hose (202) is circular, and the bottom cross-section is elliptical.

5. The biodegradable drone fire extinguishing agent carrying bag according to claim 1, characterized in that, The inner side of the water inlet body (201) is integrally formed with multiple sealing protrusions (203), and a connecting strip (204) is integrally connected to one side of the water inlet body (201). A sealing plug (205) is integrally connected to the end of the connecting strip (204).

6. A biodegradable drone fire extinguishing agent transport bag according to claim 5, characterized in that, The sealing plug (205) has multiple sealing grooves (206), and the sealing plug (205) also has an integrally formed lifting lug (207). The water inlet body (201) has an integrally formed pressure relief valve groove (208).

7. A biodegradable drone fire extinguishing agent transport bag according to claim 6, characterized in that, The pressure relief valve mechanism (3) includes a tubular mounting seat (301) that is interference-fitted into the inner side of the pressure relief valve groove (208). One end of the tubular mounting seat (301) is fixed with a first valve core (302), and a first cross slot (303) is provided on the first valve core (302). The other end of the tubular mounting seat (301) is fixed with a second valve core (304), and a second cross slot (305) is provided on the second valve core (304).

8. A biodegradable drone fire extinguishing agent transport bag according to claim 7, characterized in that, The tubular mounting base (301) is made of PLA and PBAT composite high-toughness biodegradable resin material, and the first valve core (302) and the second valve core (304) are both made of PLA and PBAT composite high-flexibility biodegradable elastic resin material.

9. A method for preparing a biodegradable drone fire extinguishing agent hoisting bag, which is applied to a biodegradable drone fire extinguishing agent hoisting bag according to any one of claims 1-8, characterized in that, The specific steps include the following: Step 1: Raw material proportioning and mixing. PLA and PBAT raw materials are selected according to the proportion, and high-strength additives, high-toughness resin additives and flexible elastic additives are respectively added to the internal mixer for high-temperature mixing, plasticizing and granulation. Bag membrane material granules for preparing bag body (101), structural resin granules for preparing water inlet body (201), tubular mounting seat (301), handle (108) and lifting ring (109), and elastic valve core granules for preparing first valve core (302) and second valve core (304) are obtained respectively. Step 2: Integrated molding process. The bag body (101) is prepared by blown film and hot pressing of the bag body film particles. The side fold (102), bottom fold (103), rounded corner (104) and reinforcing edge (105) are stamped simultaneously. The assembly area of ​​the lifting part (107) is thickened and hot-pressed to open the insert groove (106). Then, the structural resin particles are injection molded into the water inlet body (201), connecting strip (204) and seal using the injection molding process. The sealing ring (203) on the inner side of the water inlet body (201), the sealing groove (206) and the lifting lug (207) on the sealing plug (205), and the pressure relief valve groove (208) on the water inlet body (201) are formed simultaneously. The elastic valve core particles are injection molded into the first valve core (302) with the first cross groove (303) and the second valve core (304) with the second cross groove (305), thus completing the forming of the pressure relief valve mechanism (3) components. Step 3: Assembly and sealing. The handle (108) and lifting ring (109) are embedded and fixed in the mounting groove (106) of the lifting part (107). The water inlet hose (202) is heat-fused to the water inlet body (201). The tubular mounting seat (301) of the pressure relief valve mechanism (3) is interference-fitted and fixed in the pressure relief valve groove (208) of the water inlet body (201). Finally, all connection parts are heat-fused and sealed. After passing the quality inspection, the finished biodegradable drone fire extinguishing agent hoisting bag is obtained.

10. The method for preparing a biodegradable drone fire extinguishing agent hoisting bag according to claim 9, characterized in that: In step one, the mixing temperature is controlled at 160℃-190℃ and the plasticizing time is 15-25min. In step two, the hot pressing pressure of the bag body (1) is 3-5MPa and the injection molding temperature is 170℃-200℃. In step three, the hot melt sealing temperature is controlled at 155℃-175℃. All molding and assembly processes are completed in a dust-free and constant temperature environment. The finished product can be put into storage only after passing the airtightness test of the bag body (101) and the load-bearing tensile strength test of the handle (108) and the lifting ring (109).

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