Unmanned aerial rescue equipment and method of using the same

Abstract

The present invention discloses an unmanned aerial rescue device and a method for using the same, including a buoyancy body, a duct body is arranged on the outside of the buoyancy body, a motor and a propeller are arranged in the duct body; the upper end and the lower end of the duct body are respectively connected with waterproof covers, one side of the waterproof cover is rotatably connected with the duct body, and an elastic member is arranged at the rotatable connection between the waterproof cover and the duct body; a matching member is arranged on the waterproof cover, and a control member corresponding to the matching member is arranged on the buoyancy body; a height-fixing component is arranged at the lower end of the buoyancy body, and a water immersion sensor is arranged at the lower end of the height-fixing component; the water immersion sensor and the control member are both electrically connected to the control module. In the present invention, when the unmanned aerial rescue device is about to fall onto the water surface, the waterproof cover will close with the duct body, which can effectively prevent water from entering the duct body, thereby avoiding the motor from being damaged due to being immersed in water.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater rescue equipment, and in particular to an unmanned flying rescue device and a use method thereof. Background Art

[0002] The flying life buoy is a kind of rescue equipment used to rescue people who fall into the water. The traditional way to rescue people who fall into the water is to throw a life buoy to the people who fall into the water. However, the traditional throwing distance of the life buoy is short. For people who fall into the water far away from the shore, the life buoy cannot be thrown accurately from a long distance to the vicinity of the people who fall into the water, so it is impossible to effectively rescue the people who fall into the water.

[0003] The emergence of the flying life buoy solves the above problems. The existing flying life buoy can refer to the following existing patents: CN 213921429 U-a flying life buoy, CN109552626A-a flying life buoy, etc.

[0004] The flying lifebuoy is made by installing flying components (motor and propeller) on the buoyancy body to give the buoyancy body flight performance similar to that of a drone. Rescuers use a remote control on the shore to remotely control the flying lifebuoy from a long distance to make it fly to the location of the person who falls into the water and land next to the person. The person who falls into the water can grab the flying lifebuoy to prevent him from sinking.

[0005] However, the traditional flying life buoy has the following problems: since the motor is exposed outside the flying life buoy, when the flying life buoy falls on the water, the motor will be directly immersed in the water. During the process of rescuing the person who falls into the water, the motor will be immersed in the water for a long time, which will cause corrosion of the internal components of the motor, and seriously affect the performance and life of the motor, affecting the next use. Summary of the invention

[0006] The purpose of the present invention is to solve the deficiencies in the prior art and provide an unmanned aerial rescue device and a method of using the same.

[0007] The objective of the present invention is achieved through the following technical solutions: an unmanned aerial rescue device, comprising a buoyancy body, a duct body is arranged outside the buoyancy body, a motor and a propeller are arranged in the duct body; the upper end and the lower end of the duct body are respectively connected with a waterproof cover, one side of the waterproof cover is rotatably connected with the duct body, and an elastic member is arranged at the rotatable connection between the waterproof cover and the duct body; a matching member is arranged on the waterproof cover, and a control member corresponding to the matching member is arranged on the buoyancy body;

[0008] A height-fixing component is provided at the lower end of the buoyancy body, and a water immersion sensor is provided at the lower end of the height-fixing component; the water immersion sensor and the control component are both electrically connected to the control module;

[0009] When the waterproof cover is in the open state, the matching piece on the waterproof cover is connected to the control piece;

[0010] When the water immersion sensor contacts the water surface, the control component releases the matching piece on the waterproof cover, and the waterproof cover is closed with the upper end or the lower end of the duct body.

[0011] Preferably, the buoyancy body is in a "U" shape, and thrusters are respectively provided at both ends of the buoyancy body.

[0012] Preferably, sealing rings are provided on the upper end surface and the lower end surface of the duct body. By providing the sealing rings, the sealing performance of the contact between the waterproof cover and the duct body can be improved.

[0013] Preferably, the elastic member is a torsion spring.

[0014] Preferably, the control component is an electromagnet, and the matching component is an armature.

[0015] Preferably, the height-fixing component comprises a connecting component, a plurality of vertically arranged layers, and tension springs and airbags are arranged between adjacent layers; the airbags are columnar after being inflated, and the vertically adjacent airbags are connected by a first connecting pipe; the water immersion sensor is connected to the lowermost layer;

[0016] An annular cavity is provided in the connecting component, in which the airbag body between two vertically adjacent layer plates is connected with the annular cavity in the connecting component through a second connecting pipe; an electrically controlled exhaust valve and an air filling valve are provided on the connecting component, and the electrically controlled exhaust valve is electrically connected to the control module; when the water immersion sensor contacts the water surface, the electrically controlled exhaust valve opens and exhausts the airbag body.

[0017] Preferably, the airbag body is made of rubber, and the layer plate is provided with a through hole through which the first connecting tube can pass.

[0018] Preferably, the waterproof cover is provided with a lock body, the lock body is provided with a lock groove, and the outer side of the duct body is provided with a locking component corresponding to the lock body;

[0019] The locking component comprises a cylinder, an end plate is provided at one end of the cylinder close to the lock body, and an end cover is connected to the other end of the cylinder; a push plate is provided in the cylinder, a cavity is formed between the push plate and the end cover, and a water-absorbing and expanding material is filled in the cavity; a water inlet hole is provided on the cylinder, and the water inlet hole connects the cavity with the space outside the cylinder; a push rod is connected to the push plate, and a guide hole is provided on the end plate, and the push rod passes through the guide hole, and the end of the push rod away from the push plate faces the lock groove;

[0020] The lower end of the locking groove is provided with an inclined bottom surface, and one end of the inclined bottom surface close to the locking component is lower than the other end thereof; the water-swellable material expands after absorbing water and pushes the top rod to extend outward.

[0021] Preferably, the end cover is threadedly connected to the cylinder.

[0022] A method for using an unmanned aerial rescue device, the specific method is as follows: before the unmanned aerial rescue device takes off, all waterproof covers are opened, and air is inflated into an airbag body through an inflation valve to make the airbag body inflated and expanded state; at this time, a height-fixing component is in an extended state, and a water immersion sensor arranged at the lower end of the height-fixing component is located below the waterproof cover;

[0023] The rescue personnel first control the unmanned aerial rescue equipment to fly above the person who falls into the water, and then make the unmanned aerial rescue equipment descend at a certain speed until it falls on the water surface; during the descent, when the water immersion sensor on the aerial rescue equipment touches the water surface, the water immersion sensor is triggered, and the control component loosens the matching part on the waterproof cover, and the waterproof cover is closed with the upper or lower end of the duct body under the action of the elastic component; at the same time, the electronically controlled exhaust valve opens and exhausts the airbag body; when the airbag body is exhausted, the tension spring pulls the two adjacent layer plates closer to each other to shorten the overall length of the height-fixing component.

[0024] The beneficial effects of the present invention are as follows: in the present invention, when the unmanned aerial rescue equipment is about to fall onto the water surface, the waterproof cover will be closed with the duct body, which can effectively prevent water from entering the duct body, thereby avoiding damage to the motor due to immersion in water; and when the waterproof cover is tightly closed, the duct body and the inside of the waterproof cover form a closed cavity, and the closed cavity can improve the overall buoyancy of the unmanned aerial rescue equipment and improve the anti-sinking property of the unmanned aerial rescue equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the waterproof cover of the present invention when it is in an open state.

[0026] Figure 2 It is a schematic diagram of the waterproof cover of the present invention when it is in a closed state.

[0027] Figure 3 for Figure 2 Enlarged view of part A in the middle.

[0028] Figure 4 This is a schematic diagram of the locking component locking the waterproof cover.

[0029] Figure 5 This is a schematic diagram of the structure of the height-fixing component.

[0030] Figure 6 This is a partial cross-sectional view of the height-fixing component.

[0031] Figure 7 for Figure 6 Enlarged view of part B in the middle.

[0032] Figure 8 It is a connection diagram of the electromagnet, the electronically controlled exhaust valve, the water immersion sensor and the control module.

[0033] In the figure: 1, buoyancy body, 2, thruster, 3, duct body, 4 waterproof cover, 5, sealing ring, 6, motor, 7, propeller, 8, height-fixing component, 8-1, layer plate, 8-2, airbag body, 8-3, tension spring, 8-4, connecting component, 8-5, electric-controlled exhaust valve, 8-6, inflation valve, 8-7, water immersion sensor, 8-8, annular cavity, 8-9, first connecting pipe, 8-10, second connecting pipe, 9, locking component, 9-1, cylinder body, 9-2, end cover, 9-3, end plate, 9-4, push rod, 9-5, push plate, 9-6, water-absorbing and expanding material, 9-7, water inlet hole, 10, electromagnet, 11, armature, 13, lock body, 13-1, lock groove, 13-2, inclined bottom surface. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0035] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0036] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0037] like Figures 1 to 8 As shown, an unmanned flying rescue device comprises a buoyancy body 1, a duct body 3 is arranged outside the buoyancy body 1, a motor 6 and a propeller 7 are arranged in the duct body 3; the upper end and the lower end of the duct body 3 are respectively connected with a waterproof cover 4, one side of the waterproof cover 4 is rotatably connected with the duct body 3, and an elastic member is arranged at the rotatable connection between the waterproof cover 4 and the duct body 3; a matching member is arranged on the waterproof cover 4, and a control member corresponding to the matching member is arranged on the buoyancy body 1;

[0038] A height-fixing component 8 is provided at the lower end of the buoyancy body 1, and a water immersion sensor 8-7 is provided at the lower end of the height-fixing component 8; the water immersion sensor 8-7 and the control component are both electrically connected to the control module;

[0039] When the waterproof cover 4 is in the open state, the matching piece on the waterproof cover 4 is connected to the control piece;

[0040] When the water sensor 8-7 contacts the water surface, the control component loosens the matching piece on the waterproof cover 4, and the waterproof cover 4 and the upper or lower end of the duct body 3 are closed.

[0041] In the present invention, the duct body 3 is cylindrical, the duct body 3 is arranged vertically, the propeller 7 is arranged on the motor 6, and the propeller 7 is driven by the motor 6 to rotate to provide lift. The height-fixing component 8 is arranged at the lower end of the buoyancy body 1, and the height-fixing component 8 has a certain height. Before the buoyancy body 1 falls on the water surface, the water immersion sensor 8-7 installed at the lower end of the height-fixing component 8 is located below the waterproof cover 4 and a certain distance below the waterproof cover 4. The water immersion sensor 8-7 is located at the lowest position of the entire unmanned aerial rescue equipment. The water immersion sensor 8-7 can sense whether it is in contact with water; when the water immersion sensor 8-7 contacts the water surface, the water immersion sensor 8-7 will be triggered. During the flight of the unmanned aerial rescue equipment, the waterproof cover 4 is in an open state, and the airflow can pass through the duct body 3 to ensure the normal flight of the unmanned aerial rescue equipment; the waterproof cover 4 is maintained in an open state through the cooperation between the matching part and the control part; when the waterproof cover 4 is in an open state, the elastic part is in an elastic energy storage state.

[0042] When the unmanned aerial rescue equipment is about to fall onto the water surface, since the water immersion sensor 8-7 is located at the lowest position of the entire unmanned aerial rescue equipment, the water immersion sensor 8-7 will first contact the water surface and be triggered. After being triggered, the water immersion sensor 8-7 sends a trigger signal to the control module. At this time, the control module controls the control member and the matching member to loosen, and the elastic member releases the elastic potential energy and drives the waterproof cover 4 to flip in the direction of the duct body 3 until it is closed with the upper end or the lower end of the duct body 3. Under the action of the elastic member, the waterproof cover 4 and the ends of the duct body 3 are kept in a tightly closed state; at the same time, the control module controls the motor 6 to stop rotating. When the waterproof cover 4 is closed, water can be effectively prevented from entering the duct body 3, thereby avoiding the motor 6 from being damaged due to being immersed in water. And when the waterproof cover 4 is closed, a closed cavity is formed inside the duct body 3 and the waterproof cover 4. The closed cavity can improve the overall buoyancy of the unmanned aerial rescue equipment and improve the anti-sinking property of the unmanned aerial rescue equipment.

[0043] The control module is arranged in the cavity inside the buoyancy body 1. The ducts 3 are arranged on both sides of the buoyancy body 1, two ducts are arranged on each side, and the motors 6 and propellers 7 in the four ducts 3 together form a four-axis multi-rotor layout.

[0044] The buoyancy body 1 is in a "U" shape, and thrusters 2 are respectively provided at both ends of the buoyancy body 1. After the traditional flying life buoy falls near the drowning person, the drowning person needs to grab the flying life buoy and rely on his own physical strength to swim to the shore, which is a great test for the physical strength of the drowning person, especially when the drowning person is far away from the shore. The drowning person often cannot swim to the shore by his own physical strength, which makes the rescue work difficult. The present invention effectively solves the above problem by arranging thrusters 2 at both ends of the buoyancy body 1. The thruster 2 can be remotely controlled by the rescue personnel; when the drowning person grabs the buoyancy body 1, the thruster 2 can push the buoyancy body 1 and the drowning person to move to the shore, thereby ensuring the successful rescue of the drowning person.

[0045] The upper end surface and the lower end surface of the duct body 3 are both provided with sealing rings 5. By providing the sealing rings 5, the sealing performance of the contact between the waterproof cover 4 and the duct body 3 can be improved.

[0046] In this embodiment, the elastic member is a torsion spring. The control member is an electromagnet 10, and the matching member is an armature 11. When the waterproof cover 4 is in the open state, the electromagnet 10 is in the energized state, and the battery iron generates magnetic force and attracts the armature 11, so that the waterproof cover 4 is maintained in the open state; when the waterproof cover 4 changes from the open state to the closed loop state, the electromagnet 10 is powered off, and the magnetic force of the electromagnet 10 disappears at this time, and the electromagnet 10 loosens the armature 11, so that the waterproof cover 4 is turned over to the closed state under the action of the elastic member.

[0047] Specifically, the height-fixing component 8 includes a connecting component 8-4, a plurality of vertically arranged layer plates 8-1, tension springs 8-3 and airbags 8-2 are provided between adjacent layer plates 8-1; the airbags 8-2 are columnar after being inflated, and the vertically adjacent airbags 8-2 are connected by a first connecting tube 8-9; the water immersion sensor 8-7 is connected to the lowest layer plate 8-1; the airbag 8-2 is made of rubber, and a through hole is provided on the layer plate 8-1 for the first connecting tube 8-9 to pass through.

[0048] An annular cavity 8-8 is provided in the connecting component 8-4, wherein the airbag body 8-2 between two vertically adjacent layer plates 8-1 is connected with the annular cavity 8-8 in the connecting component 8-4 through a second connecting pipe 8-10; an electrically controlled exhaust valve 8-5 and an air filling valve 8-6 are provided on the connecting component 8-4, and the electrically controlled exhaust valve 8-5 is electrically connected to the control module; when the water immersion sensor 8-7 contacts the water surface, the electrically controlled exhaust valve 8-5 opens and exhausts the airbag body 8-2.

[0049] In this embodiment, four airbags 8-2 are arranged between every two adjacent layer plates 8-1, and the tension spring 8-3 is located between the airbags 8-2. The two ends of the tension spring 8-3 are respectively fixedly connected to the two adjacent layer plates 8-1. The airbags 8-2 are connected to each other in the vertical direction through the first connecting pipe 8-9. The inflation valve 8-6 is used to inflate the airbags 8-2. The electronically controlled exhaust valve 8-5 is controlled by the control module, and the airbags 8-2 are deflated when the electronically controlled exhaust valve 8-5 is opened. When the airbag 8-2 is inflated, the airbag 8-2 expands and bulges into a columnar shape. During the expansion and bulging process, the airbag 8-2 will overcome the elastic force of the tension spring 8-3 and increase the distance between the two adjacent layer plates 8-1. After the airbag 8-2 is inflated, the entire height-fixing component 8 is in a maximum length state. The purpose is to make the water immersion sensor 8-7 installed at the lower end in a lower position to ensure that the water immersion sensor 8-7 can be lower than the waterproof cover 4 by a certain height. In this way, the water immersion sensor 8-7 of the unmanned aerial rescue equipment can be in contact with the water surface first during the falling process. Through the height difference between the water immersion sensor 8-7 and the waterproof cover 4, after the water immersion sensor 8-7 is triggered, the waterproof cover 4 can have enough time to complete the closing action before it contacts the water body. When the water immersion sensor 8-7 comes into contact with the water surface, the airbag 8-2 is deflated to shrink the airbag 8-2. After losing the support of the airbag 8-2, the two adjacent layer plates 8-1 can be pulled together by the tension spring 8-3, thereby shrinking the height determining component 8 and shortening the length of the height determining component 8 to the shortest state. The advantages of this are: the resistance of the buoyancy body 1 to the movement of the height determining component 8 is reduced during the movement of the buoyancy body 1 toward the shore; at the same time, the shorter water entry length can also reduce the impact force of the water flow on the height determining component 8, thereby reducing the probability of the height determining component 8 being damaged in the water.

[0050] Furthermore, a locking body 13 is provided on the waterproof cover 4, a locking groove 13-1 is provided on the locking body 13, and a locking component 9 corresponding to the locking body 13 is provided on the outer side of the duct body 3;

[0051] The locking component 9 includes a cylinder 9-1, an end plate 9-3 is provided on one end of the cylinder 9-1 close to the lock body 13, and an end cover 9-2 is connected to the other end of the cylinder 9-1; a push plate 9-5 is provided in the cylinder 9-1, and a cavity is formed between the push plate 9-5 and the end cover 9-2, and a water-absorbing expansion material 9-6 is installed in the cavity; a water inlet hole 9-7 is provided on the cylinder 9-1, and the water inlet hole 9-7 connects the cavity with the outer space of the cylinder 9-1; a push rod 9-4 is connected to the push plate 9-5, and a guide hole is provided on the end plate 9-3, and the push rod 9-4 passes through the guide hole, and the end of the push rod 9-4 away from the push plate 9-5 is directly opposite to the lock groove 13-1;

[0052] The lower end of the locking groove 13-1 is provided with an inclined bottom surface 13-2, and one end of the inclined bottom surface 13-2 close to the locking component 9 is lower than the other end thereof; the water-swellable material 9-6 expands after absorbing water and pushes the top rod 9-4 to extend outward.

[0053] The push plate 9-5 contacts the inner wall of the cylinder 9-1 and there is a certain friction force, through which the water-absorbing and swelling material 9-6 can be stably maintained at the current position before it absorbs water and swells; when the buoyancy body 1 falls on the water surface and the waterproof cover 4 and the duct body 3 are closed, the locking component 9 will also contact with the water, and the water will enter the cylinder 9-1 through the water inlet hole 9-7, and the water-absorbing and swelling material 9-6 installed in the cylinder 9-1 will absorb water and swell, and the water-absorbing and swelling material 9-6 will push the push plate 9-5 after absorbing water and swelling. 5 moves and extends the push rod 9-4; during the extension process, the extension rod extends into the lock groove 13-1 and contacts the inclined bottom surface 13-2 at the lower end of the lock groove 13-1; since the inclined bottom surface 13-2 is inclined and one end of the inclined bottom surface 13-2 close to the locking member 9 is lower than the other end thereof, a downward pressure is applied to the inclined bottom surface 13-2, and the downward pressure acts on the waterproof cover 4 to make the waterproof cover 4 tightly contact with the end of the duct body 3, thereby improving the sealing performance between the waterproof cover 4 and the duct body 3.

[0054] In this embodiment, the water-swellable material 9-6 is a water-absorbent resin. When the water-absorbent resin comes into contact with water, it will quickly absorb water and become a hydrogel, and its volume will expand significantly.

[0055] The end cover 9-2 is threadedly connected to the cylinder 9-1. This connection method allows the end cover 9-2 to be easily disassembled, thereby facilitating the replacement of the water-swellable material 9-6.

[0056] A method for using an unmanned aerial rescue device, the specific method is as follows:

[0057] Before the unmanned aerial rescue device takes off, all waterproof covers 4 are opened, and air is inflated into the airbag body 8-2 through the inflation valve 8-6 to make the airbag body 8-2 inflated and expanded state; at this time, the height-fixing component 8 is in an extended state, and the water immersion sensor 8-7 arranged at the lower end of the height-fixing component 8 is located below the waterproof cover 4;

[0058] The rescue personnel first control the unmanned aerial rescue equipment to fly above the drowning person, and then make the unmanned aerial rescue equipment descend at a certain speed until it falls on the water surface; during the descent process, when the water immersion sensor 8-7 on the flying rescue equipment touches the water surface, the water immersion sensor 8-7 is triggered, and the control component loosens the matching component on the waterproof cover 4, and the waterproof cover 4 is closed with the upper end or the lower end of the duct body 3 under the action of the elastic component; at the same time, the electrically controlled exhaust valve 8-5 opens and exhausts the airbag body 8-2; when the airbag body 8-2 is exhausted, the tension spring 8-3 pulls the two adjacent layer plates 8-1 closer to each other to shorten the overall length of the height-fixing component 8;

[0059] When the unmanned aerial rescue equipment falls on the water, the person who falls into the water can grab the buoyancy body 1. After the person who falls into the water grabs the buoyancy body 1, the propeller 2 can push the buoyancy body 1 and the person who falls into the water toward the shore, thereby ensuring the successful rescue of the person who falls into the water.

[0060] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. An unmanned aerial rescue device, characterized in that: It comprises a buoyancy body, a duct body is arranged outside the buoyancy body, a motor and a propeller are arranged in the duct body; the upper end and the lower end of the duct body are respectively connected with waterproof covers, one side of the waterproof cover is rotatably connected with the duct body, and an elastic member is arranged at the rotatable connection between the waterproof cover and the duct body; a matching member is arranged on the waterproof cover, and a control member corresponding to the matching member is arranged on the buoyancy body; A height-fixing component is provided at the lower end of the buoyancy body, and a water immersion sensor is provided at the lower end of the height-fixing component; the water immersion sensor and the control component are both electrically connected to the control module; When the waterproof cover is in the open state, the matching piece on the waterproof cover is connected to the control piece; When the water sensor contacts the water surface, the control component releases the matching component on the waterproof cover, and the waterproof cover is closed with the upper end or the lower end of the duct body; The height-fixing component includes a connecting component and a plurality of vertically arranged layers, and tension springs and airbags are arranged between adjacent layers; the airbags are columnar after being inflated, and the vertically adjacent airbags are connected by a first connecting pipe; the water immersion sensor is connected to the lowermost layer; An annular cavity is provided in the connecting component, wherein the airbag between two vertically adjacent layers is connected to the annular cavity in the connecting component through a second connecting pipe; an electrically controlled exhaust valve and an air filling valve are provided on the connecting component, and the electrically controlled exhaust valve is electrically connected to the control module; when the water immersion sensor contacts the water surface, the electrically controlled exhaust valve opens and exhausts the airbag; The waterproof cover is provided with a lock body, the lock body is provided with a lock groove, and the outer side of the duct body is provided with a locking component corresponding to the lock body; The locking component comprises a cylinder, an end plate is provided at one end of the cylinder close to the lock body, and an end cover is connected to the other end of the cylinder; a push plate is provided in the cylinder, a cavity is formed between the push plate and the end cover, and a water-absorbing and expanding material is filled in the cavity; a water inlet hole is provided on the cylinder, and the water inlet hole connects the cavity with the space outside the cylinder; a push rod is connected to the push plate, and a guide hole is provided on the end plate, and the push rod passes through the guide hole, and the end of the push rod away from the push plate faces the lock groove; The lower end of the locking groove is provided with an inclined bottom surface, and one end of the inclined bottom surface close to the locking component is lower than the other end thereof; the water-swellable material expands after absorbing water and pushes the top rod to extend outward.

2. The unmanned aerial rescue device according to claim 1, characterized in that: The buoyancy body is in a "U" shape, and thrusters are respectively provided at both ends of the buoyancy body.

3. The unmanned aerial rescue device according to claim 1, characterized in that: The upper end surface and the lower end surface of the duct body are both provided with sealing rings.

4. The unmanned aerial rescue device according to claim 1, characterized in that: The elastic member is a torsion spring.

5. The unmanned aerial rescue device according to claim 1, characterized in that: The control component is an electromagnet, and the matching component is an armature.

6. The unmanned aerial rescue device according to claim 1, characterized in that: The airbag body is made of rubber, and a through hole is arranged on the layer plate for the first connecting pipe to pass through.

7. The unmanned aerial rescue device according to claim 1, characterized in that: The end cover is threadedly connected to the cylinder.

8. A method for using an unmanned aerial rescue device, based on the unmanned aerial rescue device of claim 1, characterized in that: The specific method is as follows: before the unmanned aerial rescue device takes off, all waterproof covers are opened, and air is inflated into the airbag through the inflation valve to make the airbag inflated and expanded state; at this time, the height-fixing component is in an extended state, and the water immersion sensor arranged at the lower end of the height-fixing component is located below the waterproof cover; The rescuer first controls the unmanned aerial rescue device to fly above the drowning person, and then makes the unmanned aerial rescue device descend at a certain speed until it falls on the water surface; during the descent process, when the water immersion sensor on the aerial rescue device touches the water surface, the water immersion sensor is triggered, and the control component releases the matching component on the waterproof cover, and the waterproof cover is closed with the upper end or the lower end of the duct under the action of the elastic component; At the same time, the electronically controlled exhaust valve opens and exhausts the airbag body; when the airbag body is exhausted, the tension spring pulls two adjacent layer plates closer to each other to shorten the overall length of the height-fixing component.

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