Skin grading opening control mechanism and method for helicopter emergency float

Abstract

The application relates to a skin grading opening control mechanism and method of a helicopter emergency float, and relates to the field of float. The skin grading opening control mechanism of the helicopter emergency float comprises a float cabin, a float folded in the float cabin, a skin covering the opening of the float cabin, a plurality of pressing seats and at least two traction ropes; the skin is used for accommodating the float in the float cabin; the upper side and the lower side of the skin are connected with the upper side and the lower side of the float cabin through the plurality of pressing seats; each end of the float cabin is connected with the corresponding end of the skin through at least one traction rope; and the pressing force of the pressing seat connected with the upper side of the skin is smaller than the pressing force of the pressing seat connected with the lower side of the skin. The skin grading opening control mechanism and method of the helicopter emergency float can actively guide the throwing direction of the skin while reducing the peak bulging force requirement, avoid the skin from being lifted and collided with the fuselage or the rotor due to the wind, and also avoid the aging and temperature adaptability difference problems caused by the different materials of the pressing seats, thereby improving the consistency and reliability of the system.

Description

Technical Field

[0001] This application relates to the field of pontoons, and more specifically, to a skin-level opening control mechanism and method for a helicopter emergency pontoon. Background Technology

[0002] The key life-saving device for helicopters making emergency landings on water is the emergency buoy. Normally, the emergency buoy is folded and stored inside the buoy compartment, protected by a skin cover; during emergency inflation, the inflating force of the airbag forces the skin open and fully deploys to achieve its life-saving function.

[0003] The existing emergency pontoon skin deployment methods have the following main problems: 1. Limited opening sequence and high impact load: In existing designs, the skin is typically fixed to the pontoon opening as a whole by a constant-force clamping device. When the "expansion force" generated by the inflation of the airbag exceeds the locking force of the constant-force clamping device, the entire skin detaches simultaneously. The drawback of this method is that the opening sequence is limited, and the simultaneous detachment of the entire skin results in a large instantaneous impact load, making it impossible to control the opening path and direction of the skin.

[0004] Second, the release direction is uncontrollable and there is a risk of collision; the release direction of the skin is determined by the expansion force and the clamping force provided by the constant force clamping component. Under complex airflow conditions, it may be thrown upwards, which poses a risk of collision with the rotor.

[0005] Third, the limitations of the traction rope function: To solve the problem of interference between the skin and the rotor after the skin is ejected, existing technology limits the maximum ejection distance by arranging a traction rope inside the skin. However, the traction rope only plays a passive limiting role: it limits the maximum distance only after the skin is ejected, and cannot actively intervene in the ejection trajectory at the moment the skin detaches. That is, it only solves the problem of how far it can fly, but not the problem of where it can fly.

[0006] Therefore, a hierarchical opening control mechanism and method for the skin of helicopter emergency floats is needed to solve the above problems. Summary of the Invention

[0007] The purpose of this application is to provide a graded opening control mechanism and method for the skin of a helicopter emergency float, which can actively guide the direction of skin deployment while reducing the peak expansion force requirement, preventing the skin from being blown up by the wind and hitting the fuselage or rotor, and also avoiding the aging and temperature adaptability differences caused by using different materials for the clamping seat, thereby improving the consistency and reliability of the system.

[0008] This application is implemented as follows: This application provides a graded opening control mechanism for the skin of a helicopter emergency float, comprising: pontoon hull; The pontoons are folded and installed inside the pontoon compartment; The skin is used to cover the opening of the pontoon compartment to house the pontoon. Multiple clamping seats connect the skin to the pontoon tank. The upper and lower sides of the skin are connected to the upper and lower sides of the pontoon tank respectively through multiple clamping seats. At least two towing ropes, with each end of the pontoon cabin connected to the corresponding end of the skin by at least one towing rope; The clamping force of the clamping seat connected to the upper side of the skin is less than that of the clamping seat connected to the lower side of the skin.

[0009] In some alternative implementations, the clamping seat includes a connecting seat connected to the pontoon hull, a clamping seat body connected to the skin, and mounting screws, the mounting screws passing through the clamping seat body and being threadedly connected to the connecting seat.

[0010] In some alternative implementations, the pontoon and the skin are respectively connected to a first connecting ring and a second connecting ring, and the two ends of the towing rope are knotted to form a rope loop that passes through and connects to the first connecting ring and the second connecting ring.

[0011] In some alternative implementations, a flexible abrasion disc is also included, with a loop at one end of the traction rope passing through and connecting to the abrasion disc and a second connecting loop in sequence.

[0012] In some alternative implementations, a heat-shrinkable tube is fitted at the knot where the traction rope connects to the anti-wear disc and the second connecting ring.

[0013] In some alternative implementations, the traction rope is an elastic, stretchable, damping rope.

[0014] In some alternative implementations, the natural length of the tow rope is greater than the extended length of the buoy.

[0015] In some alternative implementations, the maximum working length of the traction rope is greater than or less than the distance from the skin to the helicopter rotor.

[0016] In some alternative implementations, the clamping force of the clamping seat connected to the upper side of the skin is 300-400N, the sum of the clamping forces of the individual clamping seats connected to the upper side of the skin is 1000-2500N, the clamping force of the clamping seat connected to the lower side of the skin is 550-650N, and the sum of the clamping forces of the individual clamping seats connected to the lower side of the skin is 2750-3500N.

[0017] This application also provides a method for graded opening control of the skin of a helicopter emergency float, which is implemented using the aforementioned graded opening control mechanism for the skin of a helicopter emergency float, and includes the following steps: When the pontoon is inflated, it expands and compresses the inner surface of the skin. When the compressive force on the skin exceeds the clamping force of the clamping seat connected to the upper side of the skin, it detaches, causing the upper side of the skin to separate from the pontoon and flip downwards. As the pontoon continues to expand, the compressive force on the skin exceeds the compressive force of the clamping seat connected to the lower side of the skin, causing the lower side of the skin to completely separate from the pontoon compartment. Once the skin is fully released, at least two traction ropes are used to absorb kinetic energy, keeping the skin within a safe distance.

[0018] The beneficial effects of this application are as follows: The helicopter emergency float skin tiered opening control mechanism provided in this application includes a float chamber, a float folded inside the float chamber, a skin covering the opening of the float chamber, multiple clamping seats, and at least two towing ropes; the skin is used to house the float inside the float chamber; the upper and lower sides of the skin are respectively connected to the upper and lower sides of the float chamber through multiple clamping seats; each end of the float chamber is connected to the corresponding end of the skin through at least one towing rope; the clamping force of the clamping seat connected to the upper side of the skin is less than the clamping force of the clamping seat connected to the lower side of the skin. The helicopter emergency float skin staged opening control mechanism and method provided in this application connects the upper and lower sides of the skin to the upper and lower sides of the float chamber respectively through multiple clamping seats. The clamping force of the clamping seat connected to the upper side of the skin is less than that of the clamping seat connected to the lower side of the skin. This allows the upper and lower sides of the skin to open sequentially when the float is inflated and expands to open the skin, thereby controlling the skin's flipping direction. This reduces the peak inflation force requirement and actively guides the skin's release direction, preventing the skin from being blown upwards and colliding with the fuselage or rotor. It also avoids the aging and temperature adaptability differences caused by using different materials for the clamping seats, thus improving the system's consistency and reliability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 An exploded structural diagram of the skin-level opening control mechanism for the helicopter emergency float provided in this application embodiment, omitting the clamping seat and tow rope; Figure 2 A partially exploded structural diagram of the pressure seat connecting the float chamber and the skin in the graded opening control mechanism of the helicopter emergency float provided in this application embodiment; Figure 3 A partially exploded structural diagram of the tow rope connecting the float chamber and the skin in the graded opening control mechanism of the helicopter emergency float provided in this application embodiment; Figure 4A schematic diagram showing the dimensions of the small clamping seat connected to the upper side of the skin in the graded opening control mechanism of the helicopter emergency float skin provided in Embodiment 1 of this application; Figure 5 This is a schematic diagram showing the dimensions of the pressure seat body in the large pressure seat connected to the lower side of the skin in the graded opening control mechanism of the helicopter emergency float skin provided in Embodiment 1 of this application.

[0021] In the diagram: 100, pontoon compartment; 110, first connecting ring; 120, first connecting hole; 200, pontoon; 300, skin; 310, second connecting ring; 320, anti-wear disc; 330, heat shrink tubing; 340, second connecting hole; 400, clamping seat; 410, connecting seat; 420, clamping seat body; 430, mounting screw; 500, traction rope. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These terms are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] The features and performance of the helicopter emergency float skin graded opening control mechanism and method of this application are further described in detail below with reference to embodiments.

[0030] like Figure 1 , Figure 2 and Figure 3 As shown, this application provides a graded opening control mechanism for the skin of a helicopter emergency float, which includes a float compartment 100 connected to the bottom of the helicopter, a float 200 folded in the float compartment 100, a skin 300, a plurality of clamping seats 400 and at least two towing ropes 500. The skin 300 covers the opening of the pontoon compartment 100 to house the pontoon 200 inside the pontoon compartment 100; multiple clamping seats 400 are used to connect the skin 300 to the pontoon compartment 100, and the upper and lower sides of the skin 300 are respectively connected to the upper and lower sides of the pontoon compartment 100 through multiple clamping seats 400; the upper and lower sides of the clamping seats 400 are respectively provided with spaced first connecting holes 120, and the upper and lower sides of the skin 300 are respectively provided with spaced second connecting holes 340. Each clamping seat 400 includes a connecting seat 410 with one end passing through the first connecting hole 120 on the pontoon compartment 100, a clamping seat body 420 with one end passing through the second connecting hole 340 on the skin 300, and a mounting screw 430. The mounting screw 430 passes through the clamping seat body 420 and is threadedly connected to the connecting seat 410. The clamping force of the clamping seat 400 connected to the upper side of the skin 300 is less than the clamping force of the clamping seat 400 connected to the lower side of the skin 300.

[0031] Each end of the float 100 is connected to the corresponding end of the skin 300 by at least one traction rope 500. The float 100 and the skin 300 are respectively connected to a first connecting ring 110 and a second connecting ring 310 on the adjacent side. The skin 300 near the float 100 is also provided with a flexible anti-wear disc 320 corresponding to the second connecting ring 310. One end of the traction rope 500 is knotted to form a rope loop that passes through and connects to the first connecting ring 110. The other end of the traction rope 500 is knotted to form a rope loop that passes through and connects to the anti-wear disc 320 and the second connecting ring 310 in sequence. A heat shrink tube 330 is sleeved at the knot of the rope loop connecting the traction rope 500 to the anti-wear disc 320 and the second connecting ring 310. The traction rope 500 is an elastic and retractable damping rope. The natural length of the traction rope is greater than the extension length of the float 200. The maximum working length of the traction rope is greater than or less than the distance from the skin 300 to the helicopter rotor.

[0032] When installing the helicopter emergency float skin graded opening control mechanism provided in this embodiment, the float housing 100 is first connected to the bottom of the helicopter. Then, the float 200 is folded into the float housing 100. Next, both ends of the skin 300 are connected to both ends of the float housing 100 via at least one tow rope 500. One end of the tow rope 500 is knotted to form a loop that passes through and connects to the first connecting ring 110. The other end of the tow rope 500 is knotted to form a loop that passes through and connects to the anti-wear disc 320 and the second connecting ring 310. A heat shrink tube 330 is fitted at the knot of the rope ring connecting the anti-wear disc 320 and the second connecting ring 310. Then, the skin 300 is sealed over the opening of the float chamber 100 to house the float 200 inside the float chamber 100. The upper and lower sides of the skin 300 are connected to the upper and lower sides of the float chamber 100 respectively through multiple clamping seats 400, and the clamping force of the clamping seat 400 connected to the upper side of the skin 300 is less than the clamping force of the clamping seat 400 connected to the lower side of the skin 300, thus completing the installation of the skin graded opening control mechanism of the helicopter emergency float.

[0033] This application embodiment also provides a method for controlling the graded opening of the skin of a helicopter emergency float, which is implemented using the aforementioned graded opening control mechanism for the skin of a helicopter emergency float, and includes the following steps: When the helicopter needs to use the emergency float in an emergency, the external inflation device is controlled to inflate the float 200, so that the inflated float 200 expands and squeezes the inner surface of the skin 300 through the expansion force. When the compressive force on the skin 300 is greater than the compressive force of the clamping seat 400 connected to the upper side of the skin 300, the mounting screw 430 of the clamping seat 400 connected to the upper side of the skin 300 is pried open and disengaged, so that the upper side of the skin 300 separates from the float 100 and obtains an initial downward flipping posture. As the float 200 continues to expand, the expansion force on the skin 300 continues to increase and becomes greater than the clamping force of the clamping seat 400 connected to the lower side of the skin 300. This causes the mounting screw 430 of the clamping seat 400 connected to the lower side of the skin 300 to be pried open and detached, and the lower side of the skin 300 is completely separated from the float 100. After the skin 300 is fully released, it is pulled to the traction rope 500 to absorb kinetic energy, so that the traction rope 500 is stretched from loose to its natural length and then stretched elastically. When the traction rope 500 stretches to its maximum elastic elongation, it reaches its maximum working length, thus limiting the skin 300 to a safe distance.

[0034] The beneficial effects of the helicopter emergency float skin graded opening control structure and method provided in this application embodiment are: 1. Reduced impact through graded opening: By connecting the upper and lower sides of the skin 300 to the upper and lower sides of the float 100 respectively through clamping seats 400 with different clamping forces, the upper side opens first and the lower side opens later by utilizing the differentiated clamping forces between the clamping seats 400 and the upper and lower sides of the float 100. This reduces the peak expansion force required for opening the skin 300 and is more friendly to the float 200 and the connecting structure. 2. Active guidance of release direction: The upper side of the skin 300 is detached first, so that the skin 300 has a downward flipping trend, ensuring that the skin 300 will inevitably flip downward and open, avoiding the skin 300 from blowing upward and hitting the fuselage or rotor of the helicopter. 3. Material uniformity: The upper and lower clamping seats 400 are made of the same material, avoiding the problems of aging and temperature adaptability caused by different materials, and improving the consistency and reliability of the system.

[0035] 3. Damping rope absorbs end impact: The traction rope 500 is designed as a damping rope with a damping effect. It can absorb the kinetic energy when the skin 300 opens through the elastic elongation of the traction rope 500, reduce the peak impact load by about 100%, and protect the connection structure. 4. Reliable connection of traction rope 500: After passing through the connecting ring, the traction rope 500 is knotted and fixed to form a mechanical anti-loosening structure, which has better impact resistance than adhesive or sewing methods. 5. Convenient assembly and maintenance: The traction rope 500 is detachable via a connecting ring, facilitating daily inspection and replacement; 6. Preventing interference: The traction rope 500 precisely controls the maximum throwing distance, ensuring that the float 200 is fully extended while maintaining a safe distance from the helicopter rotor.

[0036] 7. Wear prevention: The other end of the traction rope 500 is knotted to form a rope loop that passes through and connects to the anti-wear disc 320 and the second connecting ring 310 in sequence. A heat shrink tube 330 is provided at the knot of the rope loop connecting the traction rope 500 to the anti-wear disc 320 and the second connecting ring 310. The anti-wear disc 320 can be used to improve the wear prevention capability of the end connection of the traction rope 500, and the heat shrink tube 330 can be used to heat shrink and protect the knotted end position.

[0037] In some alternative implementations, the clamping force of the clamping seat 400 connected to the upper side of the skin 300 can be 300-400N, the sum of the clamping forces of each clamping seat 400 connected to the upper side of the skin 300 can be 1000-2500N, the clamping force of the clamping seat 400 connected to the lower side of the skin 300 can be 550-650N, and the sum of the clamping forces of each clamping seat 400 connected to the lower side of the skin 300 can be 2750-3500N.

[0038] In some alternative embodiments, the number of clamping seats 400 connected to the upper side of the skin 300 may be greater than, equal to or less than the number of clamping seats 400 connected to the lower side.

[0039] In some alternative embodiments, each end of the pontoon 100 can be connected to the corresponding end of the skin 300 by one, two, or more towing ropes 500.

[0040] Example 1 like Figure 1 , Figure 2 , Figure 3 As shown, this application embodiment provides a graded opening control mechanism for the skin of a helicopter emergency float, which includes a float compartment 100 connected to the bottom of the helicopter, a float 200 folded into the float compartment 100, a skin 300, five small clamping seats 400, five large clamping seats 400, and two towing ropes 500; wherein, the skin 300 covers the opening of the float compartment 100 to house the float 200 inside the float compartment 100; the ten clamping seats 400 are used to connect the skin 300 to the float compartment 100, and the upper and lower sides of the skin 300 are respectively secured by five small clamping seats. The seat 400 and five large clamping seats 400 are connected to the upper and lower sides of the float 100. The upper and lower sides of the clamping seats 400 are respectively provided with spaced-apart first connecting holes 120, and the upper and lower sides of the skin 300 are respectively provided with spaced-apart second connecting holes 340. Each clamping seat 400 includes a connecting seat 410 with one end passing through the first connecting hole 120 on the float 100, a clamping seat body 420 with one end passing through the second connecting hole 340 on the skin 300, and a mounting screw 430. The mounting screw 430 passes through the clamping seat body 420 and is threadedly connected to the connecting seat 410. The structure and dimensions of the clamping seat body 420 in the clamping seats 400 connected to the upper and lower sides of the skin 300 are as follows: Figure 4 and Figure 5 As shown in the figure, the dimensions are in mm. The clamping seat 420 is made of hydrogenated nitrile rubber. The clamping force is controlled by adjusting the contact area between the clamping seat 400 and the skin 300 and the float 100. A single small clamping seat 400 provides a clamping force of approximately 350 N, while a single large clamping seat 400 provides a clamping force of approximately 600 N. The sum of the clamping forces of all the clamping seats 400 connected to the upper side of the skin 300 is 1750 N, and the sum of the clamping forces of all the clamping seats 400 connected to the lower side of the skin 300 is 3000 N.

[0041] Each end of the float 100 is connected to the corresponding end of the skin 300 via a traction rope 500. The float 100 and the skin 300 are respectively connected to a first connecting ring 110 and a second connecting ring 310 on their adjacent sides. The skin 300 near the float 100 is also provided with a flexible anti-wear disc 320 corresponding to the second connecting ring 310. One end of the traction rope 500 is knotted to form a rope loop that passes through and connects to the first connecting ring 110. The other end of the traction rope 500 is knotted to form a rope loop that passes through and connects to the anti-wear disc 320 and the second connecting ring 310 in sequence. A heat shrink tube 330 is sleeved at the knot of the rope loop connecting the traction rope 500 to the anti-wear disc 320 and the second connecting ring 310. The traction rope 500 is an elastic, stretchable, damping rope. The natural length of the traction rope 500 is greater than the extension length of the float 200. The maximum working length of the traction rope 500 is greater than or less than the distance from the skin 300 to the helicopter rotor.

[0042] Initially, the distance from the skin 300 to the helicopter rotor is L. 旋 When the float 200 is inflated and the skin 300 is extended, the traction rope 500 is slack and does not interfere with the opening of the skin 300; when the float 200 is fully extended (at this time the length of the traction rope 500 is L), the traction rope 500 is extended. 展 After that, the skin 300 continues to fly outwards, at which point the traction rope 500 begins to taut (reaching its natural length L0). Once taut, the skin 300 continues to fly outwards, pulling on the traction rope 500. The elastic extension and energy absorption of the traction rope 500 cause the skin 300 to slow down until it stops. The maximum extension length of the traction rope 500 is L. 伸max The maximum length of the traction rope 500 is L0+L 伸max Therefore, L 展 <L0, L0+L 伸max <L 旋 .

[0043] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A graded opening control mechanism for the skin of a helicopter emergency float, characterized in that, It includes: pontoon hull; The pontoon is folded and installed in the pontoon compartment; A skin is used to cover the opening of the pontoon compartment to house the pontoon within the pontoon compartment; Multiple clamping seats connect the skin to the pontoon chamber, and the upper and lower sides of the skin are respectively connected to the upper and lower sides of the pontoon chamber through the multiple clamping seats; At least two towing ropes, with each end of the pontoon cabin connected to the corresponding end of the skin via at least one towing rope; Wherein, the clamping force of the clamping seat connected to the upper side of the skin is less than the clamping force of the clamping seat connected to the lower side of the skin.

2. The helicopter emergency float skin graded opening control mechanism according to claim 1, characterized in that, The clamping seat includes a connecting seat connected to the pontoon cabin, a clamping seat body connected to the skin, and mounting screws. The mounting screws pass through the clamping seat body and are threadedly connected to the connecting seat.

3. The helicopter emergency float skin graded opening control mechanism according to claim 1, characterized in that, The pontoon and the skin are respectively connected by a first connecting ring and a second connecting ring, and the two ends of the traction rope are respectively knotted to form a rope loop that passes through and connects to the first connecting ring and the second connecting ring.

4. The helicopter emergency float skin graded opening control mechanism according to claim 3, characterized in that, It also includes a flexible anti-wear disc, and the rope loop at one end of the traction rope passes through and is connected to the anti-wear disc and the second connecting ring in sequence.

5. The helicopter emergency float skin graded opening control mechanism according to claim 4, characterized in that, A heat-shrinkable tube is fitted at the knot of the rope loop connecting the traction rope to the anti-wear disc and the second connecting ring.

6. The staged opening control mechanism for the skin of a helicopter emergency float as described in claim 1, characterized in that, The traction rope is an elastic, stretchable, damping rope.

7. The staged opening control mechanism for the skin of a helicopter emergency float as described in claim 6, characterized in that, The natural length of the traction rope is greater than the extended length of the buoy.

8. The staged opening control mechanism for the skin of a helicopter emergency float as described in claim 6, characterized in that, The maximum working length of the traction rope is greater than or less than the distance from the skin to the helicopter rotor.

9. The staged opening control mechanism for the skin of a helicopter emergency float as described in claim 1, characterized in that, The clamping force of the clamping seat connected to the upper side of the skin is 300-400N, the sum of the clamping forces of each clamping seat connected to the upper side of the skin is 1000-2500N, the clamping force of the clamping seat connected to the lower side of the skin is 550-650N, and the sum of the clamping forces of each clamping seat connected to the lower side of the skin is 2750-3500N.

10. A method for controlling the graded opening of the skin of a helicopter emergency float, characterized in that, It is achieved using the skin-stage opening control mechanism of the helicopter emergency float as described in any one of claims 1 to 9, and includes the following steps: When the pontoon is inflated, it expands and compresses the inner surface of the skin. When the compressive force on the skin exceeds the compressive force of the clamping seat connected to the upper side of the skin, it disengages, causing the upper side of the skin to separate from the float and flip downwards. As the pontoon continues to expand, the compressive force on the skin exceeds the compressive force of the clamping seat connected to the lower side of the skin, causing the lower side of the skin to completely separate from the pontoon compartment. After the skin is fully released, at least two of the traction ropes are pulled to absorb kinetic energy, thus confining the skin within a safe distance.

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