A lifesaving device for underwater salvage

Abstract

The present application relates to life-saving device technical field, especially in kind underwater salvage life-saving device, including: mechanical locking mechanism, the mechanical locking mechanism also includes outer rod, the front end of outer rod is fixedly connected with the main frame of semicircle, both ends of main frame are rotatably connected with vice frame, one end of vice frame close to outer rod is rotatably connected with inner rod through connecting rod, the inner rod is slidably arranged in the outer rod, the rear end of inner rod is fixedly connected with the sliding sleeve, the sliding sleeve is connected with inner rod through the sliding slot a of outer rod, the rear end of sliding sleeve is rotatably connected with the lock sleeve, in the scheme, through the linkage structure of sliding sleeve, inner rod, connecting rod and vice frame, the vice frame is opened or closed by pushing or pulling the sliding sleeve, after the vice frame and main frame are sleeved on the trunk of personnel, the lock sleeve is rotated to make the block move in the short slot of the groove, the vice frame can be locked in the closed state, the rapid locking and releasing of the trunk of the drowning person are realized, the device is separated from the person, the operation is convenient and reusable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lifesaving devices, in particular to a lifesaving device for underwater salvage. BACKGROUND

[0002] Underwater salvage is a professional operation of searching, rescuing and salvaging targets such as drowning persons and sunken objects in complex underwater environments. The operation scene often faces challenges such as turbid water, low visibility, and turbulent water flow, which puts high requirements on the reliability, accuracy and operation efficiency of rescue equipment. The lifesaving device for underwater salvage is the core equipment that directly acts on the drowning person, and its performance directly affects the success rate of rescue and the safety of personnel life;

[0003] The traditional device has the following disadvantages: first, it is difficult to quickly and accurately lock the torso of the drowning person, and it is not easy to separate from the drowning person after locking, which affects the rescue efficiency; second, it relies on manual visual search for the drowning person, and in special cases such as turbid water, it is difficult to quickly locate the position of the drowning person, which leads to delayed rescue; third, the way of generating buoyancy is single or unreliable, which cannot ensure the stable floating of the drowning person, and may affect the success rate of rescue.

[0004] Therefore, the present application provides a lifesaving device for underwater salvage, which realizes the "quick locking-stable clamping-convenient separation" of the torso of the drowning person through the linkage mechanical structure of the sliding sleeve, the connecting rod and the sub-frame; integrates an underwater micro-current search system, uses an electrode module and an alarm module to solve the problem of accurate positioning in turbid water and other scenes; adopts a repeatable inflatable air bag assembly and a gas cylinder linkage design, and realizes dynamic buoyancy adjustment through air pressure control, which improves the rescue reliability and device reusability. The above innovations effectively make up for the defects of traditional technology and significantly improve the efficiency and safety of underwater salvage and rescue. SUMMARY

[0005] The technical problems solved are the problems of operation complexity affecting rescue efficiency and difficulty in quickly locating the position of the drowning person.

[0006] In view of the deficiencies in the prior art, the present application provides a lifesaving device for underwater salvage, thereby solving the technical problems mentioned in the background art.

[0007] To achieve the above purpose, the present application realizes the following technical solutions:

[0008] A lifesaving device for underwater salvage, comprising:

[0009] The mechanical locking mechanism further comprises an outer rod, a semicircular main frame fixedly connected to the front end of the outer rod, a vice frame rotatably connected to both ends of the main frame, and an inner rod rotatably connected to the outer rod through a connecting rod at one end of the vice frame close to the outer rod, the inner rod being slidably arranged inside the outer rod, a sliding sleeve fixedly connected to the rear end of the inner rod, the sliding sleeve being connected to the inner rod through a sliding groove a of the outer rod, and a lock sleeve rotatably connected to the rear end of the sliding sleeve, the inner side of the lock sleeve being matched with a clamping groove of the outer rod;

[0010] The inflatable buoyancy mechanism comprises a gas cylinder, the gas cylinder being threadedly connected to the outer rod, a gas nozzle being arranged at the rear end of the gas cylinder, a gas chamber being arranged at the front end of the gas cylinder, a gas outlet being arranged between the gas chamber and the gas cylinder, a gas blocking piece being slidably arranged inside the gas chamber, a plurality of gas holes being arranged at the outer side of the gas blocking piece, a push rod being fixedly connected to the front end of each gas hole, a gas bag being arranged at the outer side of each of the two vice frames and the two sides of the main frame, the four gas bags being connected to the inner rod through a gas pipe and a connecting pipe, and a contraction pipe being arranged between the inner rod and the gas outlet of the gas chamber.

[0011] In a possible implementation, the device further comprises an underwater search and positioning system.

[0012] The underwater search and positioning system comprises an electrode module, a weak current generating module, a detection and signal processing module, and a warning module, the electrode module is arranged at the end point of the vice frame, the weak current generating module releases a safe current through the electrode, the detection module identifies the human body conductive signal through a current sensor, the warning module sends an alarm through an indicator light and a buzzer arranged on the outer rod, and a switch is further arranged on the outer rod.

[0013] In a possible implementation, the rotation connection between the main frame and the vice frame is located at 1 / 3 of the vice frame, the two vice frames and the main frame can be combined into a ring-shaped structure to enclose the torso of the drowning person, the clamping groove is a "J" shaped groove, including a long groove and a short groove, and the clamping block moves in the long groove to drive the vice frame to open / close, and the clamping block is locked in the short groove to keep the vice frame in a closed state.

[0014] In a possible implementation, a spring is arranged between the rear end of the gas blocking piece and the gas cylinder, the spring pushes the gas hole to close the gas chamber, which prevents the gas in the gas cylinder from overflowing, a gas blocking piece is fixedly connected to both sides of the push rod, and the gas blocking piece moves with the push rod to close the moving groove on both sides of the push rod to prevent gas leakage.

[0015] In a possible implementation, the gas bag is rolled inside the main frame and the vice frame, and the outer side is closed by an upper and lower rubber curtain.

[0016] In a possible implementation, the electrode module adopts a platinum-iridium alloy semi-spherical electrode, which is wrapped with a waterproof conductive film and connected with the circuit module through a waterproof sealing joint.

[0017] In a possible implementation, the weak current generation module outputs a 0.1-1 mA safety current, which is released through the front electrode of the auxiliary frame, and forms a conductive loop when the two electrodes are close to the human body.

[0018] In a possible implementation, the indicator light of the warning module is a three-color LED light, which displays green in a normal state and flashes red when a human body signal is detected; the buzzer emits an intermittent warning sound.

[0019] In a possible implementation, a sliding groove b is formed on the front side of the outer rod, which is used to accommodate the connecting pipe to ensure the smooth passage of the air path when the inner rod moves.

[0020] In a possible implementation, the device can be separated from the drowning person by rotating the lock sleeve to release the locking of the clamping block and pushing the sliding sleeve to open the auxiliary frame. The rear end of the gas cylinder is provided with a gas nozzle, through which the gas cylinder can be repeatedly inflated.

[0021] Compared with the prior art, the beneficial effects are as follows:

[0022] 1. In the present scheme, through the linkage structure of the sliding sleeve, the inner rod, the connecting rod and the auxiliary frame, pushing or pulling the sliding sleeve can make the auxiliary frame open or close. After the auxiliary frame and the main frame are used to hold the person's torso, the clamping block is moved in the clamping groove short groove by rotating the lock sleeve, which can lock the closed state of the auxiliary frame, realizing the rapid locking and releasing of the drowning person's torso, facilitating the separation of the device from the person, and being convenient and reusable;

[0023] 2. In the present scheme, the compressed gas in the gas cylinder can be filled into the air bag through the air chamber, the contraction pipe, the inner rod, the connecting pipe and the air pipe, the air bag is inflated to support the rubber curtain to form a buoyancy ball, and the air bag buoyancy drives the drowning person to float up, realizing the effective rescue and salvage of the drowning person, and improving the rescue efficiency by means of the buoyancy principle;

[0024] 3. In the present scheme, in the underwater drowning person search system, the electrode releases a weak current to form a current field, the current field changes to form a loop when it is close to the human body, the warning module is triggered through the detection and signal processing module, the indicator light turns red and flashes, and the buzzer emits an alarm, realizing the rapid search and accurate positioning of the drowning person's position in special conditions such as turbid water, and improving the accuracy and timeliness of rescue. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above description is only a summary of the technical scheme of the present application. In order to more clearly understand the technical means of the present application and can be implemented according to the content of the description, the following will be described in detail with the preferred embodiments of the present application and with the help of the drawings.

[0026] Figure 1 is a schematic view of the overall structure of the present application;

[0027] Figure 2 is a schematic view of the outer rod of the present application;

[0028] Figure 3 is a schematic view of the sub-frame of the present application;

[0029] Figure 4 is a schematic view of the inner rod of the present application;

[0030] Figure 5 is an enlarged view of A in Figure 2

[0031] Figure 6 is a schematic view of the air bag of the present application;

[0032] Figure 7 is an enlarged view of B in Figure 3

[0033] Figure 8 is a schematic view of the air closing piece of the present application;

[0034] Figure 9 is a schematic view of the switch of the present application.

[0035] Legend: 1, outer rod; 2, main frame; 3, sub-frame; 4, connecting rod; 5, inner rod; 6, sliding sleeve; 7, locking sleeve; 8, clamping block; 9, clamping groove; 10, sliding groove a; 11, gas cylinder; 12, contraction pipe; 13, connecting pipe; 14, sliding groove b; 15, air pipe; 16, air bag; 17, rubber curtain; 18, air cock; 19, air chamber; 20, air blocking piece; 21, spring; 22, lever; 23, air closing piece; 24, switch; 25, indicator light; 26, air hole; 27, air outlet. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present application will be described in detail with reference to the attached drawings, however the present application can be realized in various different forms, therefore the present application is not limited to the embodiments described below, and in order to more clearly describe the present application, components not connected with the invention will be omitted from the drawings;

[0037] The technical solutions in the embodiments of the present application are to solve the problems in the above background art, and the general idea is as follows:

[0038] Embodiment:

[0039] Please refer to Figures 1 to 9 ​​The embodiment introduces a specific structure of a lifesaving device for underwater salvage, which comprises an outer rod 1, a front end of the outer rod 1 is fixedly connected with a main frame 2, the main frame 2 is semicircular, both ends of the main frame 2 are rotatably connected with auxiliary frames 3, the end point of the main frame 2 and the rotatable connection of the auxiliary frame 3 are located at 1 / 3 of the auxiliary frame 3, both ends of the outer rod 1 are rotatably connected with connecting rods 4, both ends of the connecting rod 4 are rotatably connected with an inner rod 5, and the inner rod 5 is arranged in the inner rod 1.

[0040] The rear side of the outer rod 1 is provided with a sliding groove a10, the outer side of the outer rod 1 is slidably connected with a sliding sleeve 6, the sliding sleeve 6 is connected with the end of the inner rod 5 away from the connecting rod 4 through the sliding groove a10, the rear end of the sliding sleeve 6 is rotatably connected with a locking sleeve 7, the inner side of the locking sleeve 7 is fixedly connected with a clamping block 8, the rear surface of the outer rod 1 is provided with a clamping groove 9, and the clamping block 8 moves in the clamping groove 9.

[0041] Specifically, the sliding sleeve 6 is slidably connected on the outer side of the outer rod 1 and is connected with the inner rod 5, and then when the sliding sleeve 6 moves, the inner rod 5 moves with the sliding sleeve 6, since the other end of the inner rod 5 is connected with the connecting rod 4, the connecting rod 4 is driven to move, and since the connecting rod 4 is connected with the auxiliary frame 3, the auxiliary frame 3 is driven to rotate along the end point of the main frame 2.

[0042] Specifically, when the sliding sleeve 6 is pushed forward, the inner rod 5 and the connecting rod 4 are pushed forward, and then the two auxiliary frames 3 are pushed to open to both sides.

[0043] Specifically, when the sliding sleeve 6 is pulled back, the inner rod 5 and the connecting rod 4 are reversely moved, and then the auxiliary frame 3 is pulled to close, the two auxiliary frames 3 and the main frame 2 are together in a ring shape design, and the size can be customized in different models according to requirements, the trunk of the person is sleeved with the auxiliary frame 3 and the main frame 2, when the sliding sleeve 6 moves, the locking sleeve 7 moves, and then the clamping block 8 moves in the clamping groove 9, the clamping groove 9 is designed as a long and short parallel groove, which is in a "J" shape, when the clamping block 8 moves in the long side of the clamping groove 9, the moving distance is long, which drives the extension and recovery of the inner rod 5 and then drives the opening and closing of the auxiliary frame 3.

[0044] When the clamping block 8 moves in the short side of the clamping groove 9, the movement is limited, which is used for locking the movement of the clamping block 8 and then locking the extension of the inner rod 5, so that the auxiliary frame 3 is always in a closed state, and then the auxiliary frame 3 and the main frame 2 lock the body of the fallen person.

[0045] The rear end of the outer rod 1 is threadedly connected with a gas cylinder 11, the rear end of the gas cylinder 11 is provided with a gas nozzle 18, the inside of the gas cylinder 11 is injected with compressed gas through the gas nozzle 18, the front end of the gas cylinder 11 is provided with a gas chamber 19, the gas chamber 19 is provided with a gas outlet 27 with the gas cylinder 11, the inside of the gas chamber 19 is slidably connected with a gas blocking piece 20, the rear end of the gas blocking piece 20 is provided with a spring 21 with the gas cylinder 11, the spring 21 pushes the gas hole 26 to close the gas chamber 19, which prevents the gas in the gas cylinder 11 from overflowing;

[0046] The outside of the gas blocking piece 20 is provided with a plurality of gas holes 26, when the spring 21 pushes the gas blocking piece 20 to be attached to the inner wall of the gas chamber 19, the gas hole 26 is in a closed state;

[0047] The front end of the gas hole 26 is fixedly connected with a push rod 22, the push rod 22 extends outward, the push rod 22 can drive the gas hole 26 to move backward, at this time, the gas blocking piece 20 is separated from the inner wall of the gas chamber 19, so that the gas passage of the gas hole 26 is opened, and then the gas in the gas cylinder 11 is discharged through the gas outlet 27 and the gas hole 26;

[0048] The two sides of the push rod 22 are fixedly connected with a gas closing piece 23, the gas closing piece 23 moves with the push rod 22, which is used to close the moving groove on both sides of the push rod 22 to prevent gas leakage;

[0049] The gas outlet end of the gas chamber 19 is threadedly connected with a contraction pipe 12, the end of the contraction pipe 12 away from the gas chamber 19 is fixedly connected with the rear end of the inner rod 5, the inside of the inner rod 5 is designed as a hollow, the front side of the inner rod 5 is fixedly connected with a connecting pipe 13, and the two ends of the connecting pipe 13 are fixedly connected with gas pipes 15;

[0050] The two sides of the main frame 2 and the outside of the two auxiliary frames 3 are both mounted with air bags 16, and the ends of the two gas pipes 15 away from the connecting pipe 13 are respectively connected with the air bags 16 on the two sides;

[0051] The four air bags 16 are all wound in the inside of the two sides of the main frame 2 and the inside of the two auxiliary frames 3, the inside of the two sides of the main frame 2 and the outside of the two auxiliary frames 3 are both mounted with up-down split rubber curtains 17, and the rubber curtains 17 are made of flexible rubber material;

[0052] The front side of the outer rod 1 is provided with a sliding groove b14, the sliding groove b14 prevents the connecting pipe 13 from being affected by the outer rod 1 when the inner rod 5 moves, the connecting pipe 13 can move with the inner rod 5 through the sliding groove b14, and the gas conveying is smooth through the connection of the gas pipes 15;

[0053] Specifically, first through the gas nozzle 18 to the inside of the gas cylinder 11 injection of compressed gas, and then shrink tube 12 and the gas chamber 19 gas end connected, and then the gas cylinder 11 connected to the outer rod 1 rear end;

[0054] When the drowning person is surrounded by the main frame 2 and the vice frame 3, the push rod 22 is pushed backward, and the baffle 20 is moved backward, at this time the front end of the baffle 20 is separated from the inner wall of the gas chamber 19, and then the gas channel of the gas hole 26 is opened, the gas in the gas cylinder 11 is discharged through the gas outlet 27 and then through the gas hole 26, and then through the temporal part of the inner rod 5 and finally through the gas pipe 15 to the inside of the gas bag 16;

[0055] When the inside of the gas bag 16 is filled with gas, the gas bag 16 expands and extends, and when the pressure reaches a certain value, the rubber curtain 17 cannot continue to block the gas bag 16, and then the gas bag 16 moves out of the inside of the main frame 2 and the two vice frames 3, forming a gas-filled sphere, and then the buoyancy of the gas bag 16 drives the drowning person to float up, thereby playing a role in rescue and salvage;

[0056] Specifically, the device can be reused, after use, first through the movement of the lock sleeve 7 and then drive the clamping block 8 from the short side to the long side of the clamping groove 9, to remove the restriction on the movement of the inner rod 5, and then push the sleeve 6 forward to drive the inner rod 5 forward, and then push the connecting rod 4 to open the vice frame 3, so that the device is separated from the person;

[0057] The gas cylinder 11 is separated from the outer rod 1, and then the shrink tube 12 is separated from the output end of the gas chamber 19, at this time, the gas bag 16 is rolled up, the gas in the gas bag 16 is discharged, and the four rolled-up gas bags 16 are inserted into the inside of the main frame 2 and the two vice frames 3, and the rubber curtain 17 can prevent the gas bag 16 from moving out of the inside of the main frame 2 and the vice frame 3 when not in use, thereby playing a role in storage;

[0058] Finally, the gas nozzle 18 is connected to the inside of the gas cylinder 11 through the inflation equipment to fill in high-pressure gas again, and then the gas cylinder 11 is connected to the outer rod 1 again for subsequent use;

[0059] In addition to the above, in some special cases, the rescuer cannot see the drowning person, such as turbid water, at this time it is difficult to find the position of the drowning person, therefore, the device also includes an underwater drowning person search system, which has the function of searching for personnel, specifically as follows:

[0060] 1, system components

[0061] 1.1, electrode module

[0062] Material and structure: Choose platinum-iridium alloy with good corrosion resistance and conductivity as electrode material, design the two end points of the auxiliary frame as electrode installation position. The electrode is in the shape of a hemisphere to increase the contact area with the human body. A layer of ultra-thin waterproof conductive film with high ion permeability is wrapped around the electrode. The film only allows ions to pass through and prevents water molecules from entering in large quantities, ensuring that the electrode works normally in water and is not affected by water.

[0063] Installation and connection: The electrode is connected to the subsequent circuit module through a waterproof sealed joint. The joint is sealed with multiple rubber sealing rings and waterproof glue to prevent water from entering the internal circuit of the device.

[0064] 1.2, weak current generation module

[0065] Power selection: Use a small, high-energy-density, and waterproof lithium polymer battery as the power supply. It has good stability and long endurance, and can provide power for a certain period of time in underwater environment;

[0066] Current generation circuit: Design a special micro-current generation circuit, which is integrated in a small waterproof packaging module. It can accurately control the output of weak current and set the output current within a safe range (such as 0.1-1 mA), which can trigger the subsequent warning when the human body is conducting electricity, and will not cause harm to the human body. The module has current stability adjustment function, which can adjust the output current intensity according to the conductivity of water body; the current is discharged through the front ends of the two auxiliary frames 3; when the front ends of the two auxiliary frames 3 are close to the human body, the front ends of the auxiliary frames 3 form a closed loop with the human body;

[0067] 1.3, detection and signal processing module

[0068] Current detection: A high-sensitivity micro-current sensor is connected in series in the electrode loop, which can accurately detect the small current change caused by the human body access. The sensor has anti-interference ability and can filter out interference signals such as stray current in water;

[0069] Signal processing circuit: The weak current signal detected by the sensor is transmitted to the signal processing circuit, which amplifies, filters, and processes the signal, and then converts it into an electrical signal that can be recognized by the system. The signal processing circuit is also packaged in a waterproof housing to ensure normal operation underwater;

[0070] 1.4, warning module

[0071] Indicator light 25: A high-brightness, waterproof three-color LED indicator light 25 is installed in a conspicuous position on the outer rod 1 of the life-saving device. It displays green normally, indicating normal operation of the system. When the human body conduction signal is detected, the indicator light 25 turns red and flashes to alert the rescuer;

[0072] Sound alarm: equipped with waterproof buzzer, when the target is detected, the buzzer emits intermittent warning sound, the sound frequency and rhythm can be adjusted according to the actual demand, to ensure that it can be clearly perceived by the rescuer in the noisy underwater or water surface environment.

[0073] 2. System workflow

[0074] System startup and self-check: the rescuer presses the waterproof start switch 24 on the device, the switch 24 is installed on the outer rod 1, the system starts to work; the weak current generating module starts to output the set intensity of the weak current, the current detection module monitors the loop current in real time, the signal processing module analyzes the initial signal, if the abnormality or the current is not normally output, etc. are detected, the indicator light 25 shows yellow and flashes, prompting system failure; if everything is normal, the indicator light 25 shows green;

[0075] Search and detection: when the rescuer operates the lifesaving device to search for the drowning person in the water, the electrodes of the sub-frame 3 release a weak current in the water, forming a weak current field; since the human body is a good conductor, when the electrodes are close to the body of the drowning person, the current field changes, part of the current forms a loop through the human body, causing a small change in the current in the loop;

[0076] Signal recognition and warning: the high-sensitivity current sensor captures this current change signal and transmits it to the signal processing module, which is processed by amplification, filtering, etc. to determine whether it is an effective signal generated by human body conduction; if it is determined to be an effective signal, a trigger instruction is immediately sent to the warning module, at which time the LED indicator light becomes red and flashes, and the buzzer emits a warning sound, in multiple ways to alert the rescuer that the position of the drowning person has been detected;

[0077] In summary, when rescuing and salvaging the drowning person, the specific process is as follows:

[0078] Turn on the waterproof switch 29, the weak current generating module starts to work; the electrodes release 0.5mA safe current to the surrounding water through the sub-frame 3 end points; the rescuer holds the outer rod 1 and slowly moves in the water; when the electrodes approach the body of the drowning person, the human body conduction forms a current loop; the current sensor detects the current change (threshold set to 0.1mA); the signal processing module analyzes and confirms, and triggers the warning module; the LED indicator light 25 turns red and flashes, and the buzzer emits a high-frequency alarm;

[0079] The rescuer adjusts the position of the device according to the warning signal direction; slowly move the device so that the main frame 2 is aligned with the torso of the drowning person;

[0080] Pulling back the sliding sleeve 6, the inner rod 5 is pulled back by the sliding groove a10; the inner rod 5 pulls the connecting rod 4, and the connecting rod 4 drives the sub-frame 3 to fold inward; the sub-frame 3 rotates around the end point of the main frame 2 to form an annular wrapping around the body of the drowning person; the rotating lock sleeve 7 makes the clamping block 8 slide from the long slot to the short slot of the clamping groove 9, locking the closed state of the sub-frame 3;

[0081] Pushing back the push rod 22, the air resistance sheet 20 compresses the spring 21; the air hole 26 is communicated with the air outlet 27, and the compressed gas in the gas cylinder 11 is released; the gas enters the air bag 16 through the contraction pipe 12, the inner rod 5, the connecting pipe 13 and the air pipe 15 in sequence; the air bag 16 expands to support the rubber curtain 17, forming four buoyancy balls; under the action of buoyancy, the drowning person and the device as a whole float to the water surface; thus, the rescue work is completed.

[0082] Finally, it should be noted that: obviously, the above embodiments are only examples for clearly illustrating the present application, and are not limitations on the embodiments. For ordinary skilled persons in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and impossible to exhaust all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A life-saving device for underwater salvage, characterized in that, The device comprises a mechanical locking mechanism and an inflatable buoyancy mechanism. The mechanical locking mechanism comprises an outer rod (1), a semicircular main frame (2) fixedly connected to the front end of the outer rod (1), two vice frames (3) rotatably connected to the two ends of the main frame (2), an inner rod (5) rotatably connected to the end of the vice frame (3) close to the outer rod (1) through a connecting rod (4), the inner rod (5) being slidably arranged in the outer rod (1), a sliding sleeve (6) fixedly connected to the rear end of the inner rod (5), the sliding sleeve (6) being connected to the inner rod (5) through a sliding groove a (10) of the outer rod (1), a lock sleeve (7) rotatably connected to the rear end of the sliding sleeve (6), and an inner clamping block (8) of the lock sleeve (7) being matched with a clamping groove (9) of the outer rod (1). The inflatable buoyancy mechanism comprises a gas cylinder (11) threadedly connected to the outer rod (1), a gas nozzle (18) arranged at the rear end of the gas cylinder (11), a gas chamber (19) arranged at the front end of the gas cylinder (11), a gas outlet (27) arranged between the gas chamber (19) and the gas cylinder (11), a gas resistance piece (20) slidably connected to the inside of the gas chamber (19), a plurality of gas holes (26) arranged on the outer side of the gas resistance piece (20), a push rod (22) fixedly connected to the front end of the gas hole (26), and four air bags (16) mounted on the two sides of the main frame (2) and the outer sides of the two vice frames (3), the four air bags (16) being connected to the inner rod (5) through a gas pipe (15) and a connecting pipe (13), and a contraction pipe (12) being arranged between the inner rod (5) and the gas outlet of the gas chamber (19). The rotatable connection between the main frame (2) and the vice frame (3) is located at 1 / 3 of the vice frame (3), and the two vice frames (3) and the main frame (2) can be combined into a ring-shaped structure to cover the torso of a drowning person, the clamping groove (9) is a "J"-shaped groove comprising a long groove and a short groove, and the clamping block (8) moves in the long groove to drive the vice frame (3) to open / close, and is locked in the short groove to lock the closed state of the vice frame (3). A spring (21) is arranged between the rear end of the gas resistance piece (20) and the gas cylinder (11), the spring (21) pushes the gas hole (26) to close the gas chamber (19), which prevents the gas in the gas cylinder (11) from overflowing, and a gas closing piece (23) is fixedly connected to the two sides of the push rod (22), the gas closing piece (23) moves with the push rod (22) to close the moving grooves on the two sides of the push rod (22) to prevent gas leakage.

2. A lifesaving device for underwater salvage as claimed in claim 1, wherein, The device further comprises an underwater search and positioning system. The underwater search and positioning system comprises an electrode module, a weak current generating module, a detection and signal processing module, and a warning module, the electrode module is arranged at the end of the vice frame (3), the weak current generating module releases a safe current through the electrode, the detection module identifies the human body conductive signal through a current sensor, the warning module issues an alarm through an indicator light (25) and a buzzer installed on the outer rod (1), and a switch (24) is further installed on the outer rod (1).

3. A lifesaving device for underwater salvage as claimed in claim 1, wherein, The air bag (16) is rolled in the main frame (2) and the auxiliary frame (3), and is closed by the rubber curtain (17) on the outside.

4. A lifesaving device for underwater salvage as claimed in claim 2, wherein, The electrode module adopts platinum-iridium alloy hemispherical electrode, is wrapped by waterproof conductive film outside, and is connected with the circuit module through a waterproof sealing joint.

5. A lifesaving device for underwater salvage as claimed in claim 2, wherein, The weak current generating module outputs 0.1-1mA safe current, and releases the current through the front electrode of the auxiliary frame (3), so that an electric conduction loop is formed when the two electrodes are close to the human body.

6. A lifesaving device for underwater salvage as defined in claim 2, characterized in that The indicating lamp (25) of the warning module is a three-color LED lamp, which displays green in the normal state and flashes red when the human body signal is detected; and the buzzer emits intermittent warning sound.

7. A lifesaving device for underwater salvage as defined in claim 1, characterized in that The outer rod (1) is provided with a sliding groove b (14) on the front side, which is used for accommodating the connecting pipe (13) to ensure that the air path is unobstructed when the inner rod (5) moves.

8. A lifesaving device for underwater salvage as defined in claim 1, characterized in that The device can be separated from the drowning person by rotating the lock sleeve (7) to release the locking of the clamping block (8), pushing the sliding sleeve (6) to open the auxiliary frame (3), and the rear end of the gas cylinder (11) is provided with a gas nozzle (18), which can be repeatedly inflated through the gas nozzle (18).

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