Helicopter rescue stretcher with quick release safety belt structure and quick release safety belt structure

Abstract

The utility model relates to quick release structure technical field especially safety belt quick release structure, including installation department and with installation department activity insert fixed quick release department, installation department has third accommodating cavity, installation department perpendicular to the direction of third accommodating cavity is provided with the quick insertion hole of quick release department insertion, and installation department is equipped with first elastic limit component along the circumference of quick insertion hole, quick release department is equipped with the first limit portion that cooperates with first elastic limit component, and the circumference of limit end that quick release department extends one side of installation department is equipped with second elastic limit component. The utility model has realized the inside and outside double redundancy of safety belt quick release structure's activity limit locking, has guaranteed the reliability that safety belt uses. Meanwhile, the quick plug -in function of quick release department also has improved safety belt dismounting efficiency, has improved the efficiency of rescue. Correspondingly disclosed also have safety belt quick release structure's helicopter rescue stretcher.

Description

Technical Field

[0001] This utility model relates to the field of quick-release structure technology, and in particular to a quick-release seat belt structure and a helicopter rescue stretcher with a quick-release seat belt structure. Background Technology

[0002] In helicopter rescue missions, rescue stretchers are crucial equipment, commonly used in emergency rescue scenarios such as mountain rescues, maritime search and rescue, and disaster relief. Helicopters generate significant vibrations during flight and may encounter various complex situations during rescue operations. This necessitates that rescue stretchers possess high safety and reliability to ensure the safety of rescued personnel during transport. The seatbelt, as a vital component connecting the rescued personnel to the rescue stretcher, directly impacts the safety and efficiency of the entire rescue operation through its secure fastening structure.

[0003] Currently, existing helicopter rescue stretcher safety harness fixing structures typically use bolts and lock nuts for connection. While this fixing structure can achieve the connection between the safety harness and the stretcher to a certain extent, it has revealed many problems in actual use. For example, installation and disassembly require tools and are time-consuming; it is not compatible with standard safety harnesses and requires non-standard customization; lock nuts are prone to loosening under vibration; after the bolts are tightened, the safety harness cannot swing, causing additional restraint on rescuers; and the lock nuts need to be replaced after disassembly, resulting in high reuse costs. Utility Model Content

[0004] To address at least one of the aforementioned technical problems, this utility model proposes a quick-release seatbelt structure and a helicopter rescue stretcher with a quick-release seatbelt structure, in order to solve the problems of inflexible seatbelt fixing methods and poor anti-loosening effects in existing helicopter rescue stretchers.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The first aspect of this utility model provides a quick-release structure for a seat belt, including an installation part and a quick-release part that is movably inserted and fixed to the installation part. The installation part has a third receiving cavity for inserting the buckle end of the seat belt. The installation part has a quick-insertion hole for inserting the quick-release part in a direction perpendicular to the third receiving cavity. The installation part has a first elastic limiting component for movably limiting and fixing the quick-release part along the circumference of the quick-insertion hole. The quick-release part is provided with a first limiting part that cooperates with the first elastic limiting component, and the quick-release part is provided with a second elastic limiting component in the circumferential direction at the limiting end extending from the mounting part. Under the action of the first elastic limiting component and the second elastic limiting component, the quick-release part and the mounting part form an inner and outer double redundant movable limiting.

[0006] Preferably, the first elastic limiting component includes a limiting housing with a first accommodating cavity. The limiting housing has a first positioning hole at its top center. A first spring is provided in the first accommodating cavity along its central axis. The fixed end of the first spring is fixed to the bottom of the first accommodating cavity. A first positioning bead is provided between the free end of the first spring and the first positioning hole. The first positioning bead is movably embedded in the first positioning hole under the elastic force of the first spring. The inner surface of the first positioning hole is an arc surface that fits with the first positioning bead. The inner diameter of the first positioning hole is smaller than the diameter of the first positioning bead.

[0007] Preferably, the number of the first elastic limiting components is three, and they are arranged in a circular array around the central axis of the quick-connect hole in the mounting part.

[0008] Preferably, the first limiting part is an arc-shaped limiting groove disposed on the outer periphery of the quick-release part, and the central axis of the arc-shaped limiting groove coincides with the central axis of the quick-release hole.

[0009] Preferably, the limiting end of the quick-release part has a plurality of second receiving cavities arranged in a ring around the central axis of the quick-release part, the central axis of the second receiving cavity is perpendicular to the central axis of the quick-release part, and the limiting end is provided with a second positioning hole communicating with the second receiving cavity at a position corresponding to the coaxial line of the second receiving cavity; The second elastic limiting component includes a second spring arranged along the central axis of the second accommodating cavity. The fixed end of the second spring is fixed to the bottom of the second accommodating cavity. A second positioning bead is provided between the free end of the second spring and the second positioning hole. Under the action of the elastic force of the second spring, the second positioning bead is movably embedded in the second positioning hole. The inner surface of the second positioning hole is an arc surface that fits with the second positioning bead. The inner diameter of the second positioning hole is smaller than the diameter of the second positioning bead.

[0010] Preferably, the mounting part includes a mounting block and a limiting block disposed on one side of the mounting block, the quick-connect hole perpendicularly penetrating the mounting block and the limiting block; the third accommodating cavity is opened on the upper part of the mounting block along the length direction of the mounting block, the opening of the third accommodating cavity faces upward, and the length is greater than the width of the buckle end of the seat belt; The limiting block has mounting holes arranged in a ring around the central axis of the quick-connect hole for mounting the limiting housing, and the mounting holes are connected to the quick-connect hole.

[0011] Preferably, the limiting housing is a cylinder with external threads, the mounting hole has an internal thread that matches the external threads, and the bottom of the limiting housing is provided with a groove to facilitate rotation.

[0012] Preferably, the quick-release part includes a cylindrical quick-release rod, the limiting end is chamfered, the end of the quick-release rod away from the limiting end is provided with an annular limiting plate, the center of the limiting plate opposite to the quick-release rod is provided with a connecting post, and the connecting post is movably provided with a pull ring for easy assembly and disassembly of the quick-release rod.

[0013] The second aspect of this utility model provides a helicopter rescue stretcher with a quick-release seat belt structure, including a stretcher body and quick-release seat belt structures symmetrically arranged on both sides of the stretcher body as described in the first aspect.

[0014] Preferably, the number of quick-release seat belt structures is four.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This utility model, by setting a first elastic limiting component and a second elastic limiting component, ensures that when the quick-release part is inserted into the mounting part through the quick-connect hole, the second elastic limiting component at the limiting end is located outside the mounting part. At this time, the second elastic limiting component forms an external movable limiting lock on the quick-release part from the outside of the mounting part. Simultaneously, through the limiting and fixing of the first elastic limiting component and the first limiting part, the movable limiting and fixing of the quick-release part is achieved from the inside of the mounting part. This achieves internal and external double redundant movable limiting locking of the seat belt quick-release structure, ensuring the reliability of the seat belt. Furthermore, the quick insertion and removal function of the quick-release part also improves the efficiency of seat belt installation and removal, and enhances rescue efficiency.

[0016] 2. This utility model, by setting a quick-release structure for the seat belt on both sides of the helicopter rescue stretcher, inserts the buckle end of the seat belt into the mounting block. Under the double redundancy anti-loosening effect of the first and second limiting components, it not only realizes the quick insertion and removal of the quick insertion rod in the quick insertion hole, enabling the seat belt to be quickly limited, fixed and released, but also improves the anti-loosening effect of the seat belt. Attached Figure Description

[0017] Figure 1 A schematic diagram of a helicopter rescue stretcher with a quick-release seatbelt structure; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 A side view of a helicopter rescue stretcher with a quick-release seatbelt. Figure 4 for Figure 3 Sectional view along direction A; Figure 5 for Figure 4 Enlarged view at point B in the middle; Figure 6 This is a schematic diagram of the quick-release part in this utility model; Figure 7 for Figure 6 Sectional view along direction B; Figure 8 Top view of the first elastic limiting component; Figure 9 for Figure 8 Sectional view along line C; Figure 10 This is a schematic diagram of the limiting shell in this utility model; Figure 11 This is a schematic diagram of the quick-release structure for seat belts in this utility model. Figure 12 for Figure 11 Sectional view along line D; Figure 13 for Figure 11 Sectional view along line E.

[0018] In the figure: 10, mounting part; 101, mounting block; 1011, third accommodating cavity; 102, limiting block; 1021, mounting hole; 103, first elastic limiting component; 1031, limiting housing; 10311, first positioning hole; 10312, groove; 10313, first accommodating cavity; 1032, first spring; 1033, first positioning bead; 20. Quick-release part; 201. Quick-release rod; 2011. First limiting part; 2013. Second positioning hole; 202. Limiting plate; 203. Connecting post; 204. Pull ring; 205. Second elastic limiting assembly; 2051. Second receiving cavity; 2052. Second spring; 2053. Second positioning bead; 30. Stretcher body; 301. Safety belt; 302. Buckle end. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions in this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments in this utility model, and not all of the embodiments in this utility model.

[0020] Please refer to Figures 1-13 As shown, the seat belt quick-release structure includes a mounting part 10 and a quick-release part 20 that is movably inserted and fixed to the mounting part 10. The mounting part 10 has a third receiving cavity 1011 for inserting the buckle end 302 of the seat belt 301. The mounting part 10 has a quick insertion hole for inserting the quick-release part 20 in a direction perpendicular to the third receiving cavity 1011. The mounting part 10 has a first elastic limiting component 103 for movably limiting and fixing the quick-release part 20 along the circumference of the quick insertion hole. The quick-release part 20 is provided with a first limiting part 2011 that cooperates with the first elastic limiting component 103, and the quick-release part 20 is provided with a second elastic limiting component 205 in the circumferential direction at the limiting end extending from the mounting part 10. Under the action of the first elastic limiting component 103 and the second elastic limiting component 205, a double redundant movable limiting is formed between the quick-release part 20 and the mounting part 10.

[0021] This embodiment, by setting a first elastic limiting component 103 and a second elastic limiting component 205, ensures that when the quick-release part 20 is inserted into the mounting part 10 through the quick-connect hole, the second elastic limiting component 205 at the limiting end is located outside the mounting part 10. At this time, the second elastic limiting component 205 forms an external movable limiting lock on the quick-release part 20 from the outside of the mounting part 10. Simultaneously, through the limiting and fixing of the first elastic limiting component 103 and the first limiting part 2011, the movable limiting and fixing of the quick-release part 20 is achieved from the inside of the mounting part 10. This realizes the internal and external dual redundant movable limiting lock of the seat belt quick-release structure, ensuring the reliability of the seat belt 301. Furthermore, the quick insertion and removal function of the quick-release part 20 also improves the efficiency of seat belt 301 installation and removal, thus improving rescue efficiency.

[0022] Please refer to Figure 2 , Figure 5 , Figures 8-10 as well as Figure 13 As shown, in this embodiment, the first elastic limiting component 103 includes a limiting shell 1031 with a first accommodating cavity 10313. A first positioning hole 10311 is provided at the top center of the limiting shell 1031. A first spring 1032 is provided in the first accommodating cavity 10313 along its central axis. The fixed end of the first spring 1032 is fixed to the bottom of the first accommodating cavity 10313. A first positioning bead 1033 is provided between the free end of the first spring 1032 and the first positioning hole 10311. Under the elastic force of the first spring 1032, the first positioning bead 1033 is movably embedded in the first positioning hole 10311. The inner surface of the first positioning hole 10311 is an arc surface that fits with the first positioning bead 1033. The inner diameter of the first positioning hole 10311 is smaller than the diameter of the first positioning bead 1033.

[0023] It should be noted that in this embodiment, the first limiting part 2011 is an arc-shaped limiting groove disposed on the outer periphery of the quick-release part 20, and the central axis of the arc-shaped limiting groove coincides with the central axis of the quick-connect hole. Meanwhile, there are three first elastic limiting components 103, which are arranged in a circular array around the central axis of the quick-connect hole on the mounting part 10. Obviously, the number of first elastic limiting components 103 can be adjusted as needed, and this application does not limit this.

[0024] Understandably, when the quick-connect part is inserted into the quick-connect hole, the flat portion of the quick-connect part presses against the first positioning bead 1033, causing the first positioning bead 1033 to retract into the first positioning hole 10311, ensuring that the quick-connect part can move within the quick-connect hole. When the first limiting part 2011 moves to the position of the first positioning bead 1033, due to the arc design of the inner surface of the first positioning hole 10311, the first positioning bead 1033 can partially protrude from the first positioning hole 10311 and enter the quick-connect hole under the elastic force of the first spring 1032, and embed itself in the arc-shaped limiting groove, thereby limiting the movement of the quick-connect part from the inside.

[0025] To facilitate the installation of the first limiting component, in this embodiment, the limiting housing 1031 is a cylinder with external threads, and the mounting hole 1021 has an internal thread that matches the external threads. The bottom of the limiting housing 1031 is provided with a groove 10312 for easy rotation. Furthermore, by being detachable, when the first limiting component wears out during use, only the damaged first limiting component needs to be replaced, allowing continued use and reducing operating costs.

[0026] It is understood that the groove 10312 mentioned above can be a slotted groove, a Phillips head groove, a Torx groove, or an internal hexagonal groove, etc. During installation, the operator can install or remove the limiting housing 1031 using a screwdriver. At the same time, the depth of the first positioning bead 1033 embedded in the arc-shaped limiting groove can also be adjusted by rotating the limiting housing 1031. This effectively avoids the following: if the embedding depth is too large, it will be difficult to pull out quickly; if the embedding depth is too small, "false locking" will occur, causing the first positioning bead 1033 to retract into the first positioning hole 10311 under a small external force, thus failing to effectively limit and lock the quick-connect part.

[0027] Please refer to Figure 2 , Figures 5-7 As shown, in this embodiment, the limiting end of the quick-release part 20 has a plurality of second accommodating cavities 2051 arranged in a ring around the central axis of the quick-release part 20. The central axis of the second accommodating cavity 2051 is perpendicular to the central axis of the quick-release part 20. The limiting end is provided with a second positioning hole 2013 communicating with the second accommodating cavity 2051 at a position corresponding to the coaxial line of the second accommodating cavity 2051. The second elastic limiting component 205 includes a second spring 2052 arranged along the central axis of the second accommodating cavity 2051. The fixed end of the second spring 2052 is fixed to the bottom of the second accommodating cavity 2051. A second positioning bead 2053 is provided between the free end of the second spring 2052 and the second positioning hole 2013. Under the elastic force of the second spring 2052, the second positioning bead 2053 is movably embedded in the second positioning hole 2013. The inner surface of the second positioning hole 2013 is an arc surface that fits with the second positioning bead 2053. The inner diameter of the second positioning hole 2013 is smaller than the diameter of the second positioning bead 2053.

[0028] It should be noted that when the quick-connect part is inserted into the quick-connect hole, the second positioning bead 2053 is pressed back into the second positioning hole 2013 under the squeezing action inside the quick-connect hole, ensuring that the quick-connect part can move within the quick-connect hole. When the limiting end of the quick-connect part extends beyond the outside of the mounting part 10, since the second positioning bead 2053 is no longer subjected to squeezing force, it is partially pushed out of the second positioning hole 2013 under the elastic force of the second spring 2052. At this time, the second positioning bead 2053 is higher than the inner surface of the quick-connect hole, forming an external limit on the movement of the quick-connect part.

[0029] Understandably, to ensure the smooth ejection of the second positioning bead 2053, it is necessary to ensure that the second positioning bead 2053 is fully exposed on one side of the mounting part 10 while the first positioning bead 1033 ejects and is locked in place by the first limiting part 2011 (arc-shaped limiting groove). Alternatively, the first positioning bead 1033 ejects with a delay relative to the second positioning bead 2053. That is, after the second positioning bead 2053 is fully exposed on one side of the mounting part 10, the quick-connect part continues to move a certain distance before the first limiting part 2011 moves to the position of the first positioning bead 1033, at which point the first positioning bead 1033 ejects.

[0030] To facilitate the retraction of the second positioning bead 2053, this embodiment provides arc-shaped bevels at both ends of the quick-connect hole of the mounting part 10 corresponding to the positions of the second positioning bead 2053. This ensures that the second positioning bead 2053 can smoothly retract at the arc-shaped bevel positions, thereby ensuring that the quick-connect part can be quickly assembled and disassembled at this specific position. Obviously, to ensure the stability of the quick-connect part after installation, the operator can rotate the quick-connect part after installation to offset the position of the second positioning bead 2053 from the arc-shaped bevel, reducing the need for a small external force to retract the second positioning bead 2053 into the second positioning hole 2013 along the arc-shaped bevel.

[0031] It should be noted that, in order to facilitate the fixing of the first spring 1032 and the second spring 2052, in this embodiment, a positioning post is provided at the bottom center of both the first accommodating cavity 10313 and the second accommodating cavity 2051, and the fixing ends of the first spring 1032 and the second spring 2052 are sleeved and fixed on the positioning post.

[0032] Please refer to Figures 1-5 As shown, in this embodiment, the mounting part 10 includes a mounting block 101 and a limiting block 102 disposed on one side of the mounting block 101. The quick-connect hole penetrates vertically through the mounting block 101 and the limiting block 102. The third accommodating cavity 1011 is opened on the upper part of the mounting block 101 along the length direction of the mounting block 101. The opening of the third accommodating cavity 1011 faces upward and its length is greater than the width of the buckle end 302 of the seat belt 301. The limiting block 102 has mounting holes 1021 for mounting the limiting housing 1031 in a ring array with the central axis of the quick-connect hole as the center. The mounting holes 1021 are connected to the quick-connect hole.

[0033] In this embodiment, since the length of the third accommodating cavity 1011 (along the length direction of the stretcher described below) is greater than the width of the buckle end 302 of the safety belt 301, and the buckle end 302 and the quick-connect part are in clearance fit, after being fixed, the buckle end 302 of the safety belt 301 can adapt to the displacement of the rescued person on the stretcher along the length direction of the stretcher by rotation, avoiding the safety belt 301 causing injury to the rescued person due to resistance.

[0034] It should be noted that in this embodiment, the mounting part 10 serves as a connector between the stretcher body 30 and the buckle end 302 of the safety belt 301. Therefore, the specific structure of the mounting part 10 is not particularly limited. For example, the mounting part 10 can consist of a flat rectangular mounting block 101 and a smaller rectangular limiting block 102, with an overall cross-section in the shape of a T. It is understood that the limiting block 102 can also be a cube or a flat cylinder. While fulfilling the installation and connection functions, the overall volume can be appropriately optimized to avoid excessive size, which would inconvenience the rescued person on the stretcher and increase costs.

[0035] Please refer to Figures 5-7 As shown, the quick-release part 20 includes a cylindrical quick-release rod 201 with a chamfered end. An annular limiting plate 202 is provided at the end of the quick-release rod 201 away from the limiting end. A connecting post 203 is provided at the center of the side of the limiting plate 202 opposite to the quick-release rod 201. A pull ring 204 is movably provided on the connecting post 203 to facilitate the installation and removal of the quick-release rod 201.

[0036] Understandably, by chamfering the end of the limiting end, when the quick-release lever 201 is inserted, the first positioning bead 1033 can smoothly retract along the chamfered portion of the limiting end, reducing the impact force between the end of the quick-release lever and the first positioning bead 1033, thereby improving the efficiency and service life of the quick-release lever insertion and removal. The pull ring 204 facilitates the operator's insertion and removal of the quick-release lever 201.

[0037] Please refer to Figures 1-3 As shown, the quick-release seatbelt structure in this embodiment can be applied to helicopter rescue stretchers. Specifically, multiple quick-release seatbelt structures can be symmetrically arranged on both sides of the stretcher body 30. Specifically, in this embodiment, four quick-release seatbelt structures are symmetrically arranged on both sides of the stretcher body 30. The mounting block 101 can be fixed to both sides of the stretcher by welding or detachment. Simultaneously, to facilitate the fixing of the mounting block 101 to the longitudinal beams on both sides of the stretcher body 30, the lower part of the mounting block 101 can be provided with through holes matching the longitudinal beams, and it can be fixed to the longitudinal beams by fitting. Obviously, this application does not limit the method of fixing the quick-release seatbelt structure to the longitudinal beams.

[0038] This utility model, by setting a quick-release structure for the safety belt on both sides of the helicopter rescue stretcher, inserts the buckle end 302 of the safety belt 301 into the mounting block 101. Under the double redundancy anti-loosening effect of the first and second limiting components, it not only realizes the quick insertion and removal of the quick insertion rod in the quick insertion hole, enabling the safety belt 301 to be quickly limited, fixed and released, but also improves the anti-loosening effect of the safety belt 301.

[0039] The above description is a specific implementation of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A quick-release seatbelt structure, comprising a mounting part (10) and a quick-release part (20) movably inserted and fixed to the mounting part (10), characterized in that, The mounting part (10) has a third accommodating cavity (1011) for inserting the buckle end (302) of the seat belt (301). The mounting part (10) has a quick-release hole for inserting the quick-release part (20) in a direction perpendicular to the third accommodating cavity (1011). The mounting part (10) has a first elastic limiting component (103) for moving and fixing the quick-release part (20) around the quick-release hole. The quick-release part (20) is provided with a first limiting part (2011) that cooperates with the first elastic limiting component (103), and the quick-release part (20) extends out of the limiting end on one side of the mounting part (10) and is provided with a second elastic limiting component (205). Under the action of the first elastic limiting component (103) and the second elastic limiting component (205), the quick-release part (20) and the mounting part (10) form an inner and outer double redundant active limiting.

2. The quick-release seatbelt structure according to claim 1, characterized in that, The first elastic limiting component (103) includes a limiting housing (1031) having a first accommodating cavity (10313). The limiting housing (1031) has a first positioning hole (10311) at its top center. A first spring (1032) is provided in the first accommodating cavity (10313) along its central axis. The fixed end of the first spring (1032) is fixed to the bottom of the first accommodating cavity (10313). A first positioning bead (1033) is provided between the free end of the first spring (1032) and the first positioning hole (10311). Under the elastic force of the first spring (1032), the first positioning bead (1033) is movably embedded in the first positioning hole (10311). The inner surface of the first positioning hole (10311) is an arc surface that fits with the first positioning bead (1033). The inner diameter of the first positioning hole (10311) is smaller than the diameter of the first positioning bead (1033).

3. The quick-release seatbelt structure according to claim 2, characterized in that, The number of the first elastic limiting components (103) is 3, and they are arranged in a ring array around the central axis of the quick-connect hole in the mounting part (10).

4. The quick-release structure for seat belts according to claim 2, characterized in that, The first limiting part (2011) is an arc-shaped limiting groove provided on the outer periphery of the quick-release part (20), and the central axis of the arc-shaped limiting groove coincides with the central axis of the quick-release hole.

5. The quick-release structure for seat belts according to claim 1, characterized in that, The limiting end of the quick-release part (20) has a plurality of second receiving cavities (2051) arranged in a ring around the central axis of the quick-release part (20). The central axis of the second receiving cavity (2051) is perpendicular to the central axis of the quick-release part (20). The limiting end is provided with a second positioning hole (2013) communicating with the second receiving cavity (2051) at a position corresponding to the coaxial line of the second receiving cavity (2051). The second elastic limiting component (205) includes a second spring (2052) arranged along the central axis of the second accommodating cavity (2051). The fixed end of the second spring (2052) is fixed to the bottom of the second accommodating cavity (2051). A second positioning bead (2053) is provided between the free end of the second spring (2052) and the second positioning hole (2013). Under the elastic force of the second spring (2052), the second positioning bead (2053) is movably embedded in the second positioning hole (2013). The inner surface of the second positioning hole (2013) is an arc surface that fits with the second positioning bead (2053). The inner diameter of the second positioning hole (2013) is smaller than the diameter of the second positioning bead (2053).

6. The quick-release seatbelt structure according to claim 2, characterized in that, The mounting part (10) includes a mounting block (101) and a limiting block (102) disposed on one side of the mounting block (101). The quick-connect hole penetrates the mounting block (101) and the limiting block (102) vertically. The third accommodating cavity (1011) is opened on the upper part of the mounting block (101) along the length direction of the mounting block (101). The opening of the third accommodating cavity (1011) is upward and its length is greater than the width of the buckle end (302) of the seat belt (301). The limiting block (102) has mounting holes (1021) arranged in a ring around the central axis of the quick-connect hole for mounting the limiting housing (1031), and the mounting holes (1021) are connected to the quick-connect hole.

7. The quick-release seatbelt structure according to claim 6, characterized in that, The limiting housing (1031) is a cylinder with external threads, and the mounting hole (1021) has an internal thread that matches the external threads. The bottom of the limiting housing (1031) is provided with a groove (10312) that facilitates rotation.

8. The quick-release structure for seat belts according to claim 6, characterized in that, The quick-release part (20) includes a cylindrical quick-release rod (201), the limiting end is chamfered, and an annular limiting plate (202) is provided at the end of the quick-release rod (201) away from the limiting end. A connecting post (203) is provided at the center of the side of the limiting plate (202) opposite to the quick-release rod (201). The connecting post (203) is movably provided with a pull ring (204) to facilitate the installation and removal of the quick-release rod (201).

9. A helicopter rescue stretcher with a quick-release seatbelt structure, characterized in that, It includes a stretcher body (30) and a quick-release safety belt structure symmetrically arranged on both sides of the stretcher body (30) as described in any one of claims 1-8.

10. The helicopter rescue stretcher with a quick-release seatbelt structure according to claim 9, characterized in that, The number of quick-release seat belt structures is 4.

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