Automatic spreading helicopter pad and preparation method thereof

Abstract

The invention relates to an automatic spreading helicopter pad and a preparation method thereof. The method comprises the following steps: preparing pad base cloth; tailoring and sewing the base cloth: tailoring the base cloth into a plurality of unit blocks, and performing double-layer sewing on the tailored unit blocks; supporting ribs and torsional springs are installed, specifically, according to design requirements, the supporting ribs are correspondingly inserted into each double-layer sewn unit block, and the multiple torsional springs are installed on part of the supporting ribs; the edge of each unit block is covered and sewn, and the connecting sleeves are installed on the covered edges; splicing: splicing the plurality of unit blocks into a circular landing pad through the connecting sleeves and the connecting ribs; folding and packaging: folding the spliced landing pad into an umbrella-shaped structure, and bundling the umbrella-shaped structure into a roll by using a rope to form an automatic spreading helicopter landing pad product; when the rope is released, the torsion spring releases pressure and is opened, and the circular landing pad is automatically unfolded. The foldable and portable folding-type automatic spreading device can be quickly and automatically spread, and has the advantages of light weight, high bearing strength, folding portability and good environmental adaptability.

Description

Technical Field

[0001] The present invention relates to the technical fields of emergency rescue and military operations, and more particularly to an automatically spreading helicopter landing pad and a preparation method thereof. Background Art

[0002] In emergency rescue, military operations and other scenarios, helicopters often need to take off and land quickly in complex terrain (such as beaches, sandy riverbanks, Gobi deserts and soft soil). However, the bearing capacity of such terrain is weak and the environment is complex. Traditional concrete hardened helipads have problems such as long construction period, high cost and inability to relocate, making it difficult to meet emergency needs. For this reason, mobile helicopter landing pad technology has gradually developed, but it still has the following defects:

[0003] 1. Limitations of modular landing pads. Patent document CN107059666A proposes a modular solution using glass fiber reinforced polyester monofilament woven into blocks. While this solution offers some portability, it requires manual on-site assembly, resulting in low efficiency and difficulty adapting to emergency situations. Patent document CN214930717U utilizes connectors and grooves to achieve assembly of landing pads, but this still requires the assembly of multiple blocks, making the process complex, time-consuming, and labor-intensive.

[0004] 2. Complexity of the foldable structure. Patent document CN113529592A uses a foldable main deck and multi-link driven side deck structure. Although it achieves a certain degree of automatic deployment function, it relies on a hydraulic system and a multi-stage linkage mechanism, resulting in a complex structure, high manufacturing costs, and reliability is limited by mechanical components.

[0005] The common defects of the above prior art are:

[0006] Low deployment efficiency: Relying on manual assembly or complex mechanical deployment, it is difficult to achieve rapid and automatic deployment.

[0007] Lack of portability: Multi-unit block design or bulky structure makes transportation and airdrop difficult.

[0008] Cost and reliability issues: Complex mechanical components increase manufacturing costs and are easily affected by environmental factors (such as dust and impact) and their stability.

[0009] Therefore, there is an urgent need for a helicopter landing pad that is lightweight, has high load-bearing capacity, and can be quickly and automatically deployed to meet the needs of efficient and reliable airdrop deployment in emergency rescue and military scenarios. Summary of the Invention

[0010] To this end, one object of the present invention is to propose a method for preparing an automatically spreading helicopter landing pad, and another object is to provide a helicopter landing pad produced by the above method to overcome the shortcomings of the existing mobile helicopter landing pad technology.

[0011] The technical solution of the present invention is a method for preparing an automatically spreading helicopter landing pad, comprising the following steps:

[0012] S1, preparing the landing pad base fabric;

[0013] S2. Cutting and sewing the base fabric: cutting the base fabric into multiple unit blocks, and sewing the cut unit blocks into double layers;

[0014] S3. Install support ribs and torsion springs: According to the design requirements, insert support ribs into each double-layer sewn unit block, and install multiple torsion springs on some of the support ribs;

[0015] S4, hemming and connecting sleeve installation: sew the edges of each unit block and install the connecting sleeve on the hemming; steps S3 and S4 are interchangeable;

[0016] S5. Splicing: Splice multiple unit blocks into a circular landing platform through connecting sleeves and connecting ribs, and install torsion springs at the corresponding parts of the supporting ribs on the connecting ribs;

[0017] S6. Folding packaging: Fold the spliced landing pad multiple times at the torsion spring installation position to form an umbrella-shaped structure, and bundle it into a roll with ropes to form an automatically unfolding helicopter landing pad product; release the rope state, the torsion spring releases the pressure and opens, and automatically unfolds into a circular landing pad.

[0018] According to the preparation method of the present invention, ultra-high strength polyethylene fiber is used to weave the base fabric in S1, and the base fabric has a tensile strength of ≥400MPa and a density of 250-300g / m 2 .

[0019] According to the preparation method of the present invention, in S2, multiple strands of ultra-high-strength polyethylene fiber yarn are used for double-layer sewing, and the tensile strength of the sewing line is ≥2000 MPa.

[0020] According to the preparation method of the present invention, the support ribs used in S3 and the connecting ribs in S5 are both made of fiber-reinforced resin-based composite materials, with a bending strength greater than or equal to 500 MPa and a diameter of 18-20 mm.

[0021] According to the preparation method of the present invention, the support ribs have first-length support ribs, second-length support ribs, third-length support ribs and fourth-length support ribs, and the length of the connecting ribs = the length of the first-length support ribs > the length of the second-length support ribs > the length of the third-length support ribs > the length of the fourth-length support ribs; each unit block has one connecting rib, four first-length support ribs, four second-length support ribs, four third-length support ribs and twelve fourth-length support ribs.

[0022] According to the preparation method of the present invention, each unit block is supported by connecting ribs, first length support ribs, second length support ribs, third length support ribs and fourth length support ribs to form a fan-shaped structure. The connecting ribs, first length support ribs, second length support ribs and third length support ribs are all disconnected at the folding position, and torsion springs are installed at the disconnected positions to provide elastic restoring force after folding.

[0023] According to the preparation method of the present invention, the rope in S6 is made of synthetic fiber, and the release rope adopts a remote high-temperature fuse rope method.

[0024] According to the preparation method of the present invention, the surface of the circular landing pad in S5 has anti-slip texture, and the edging material and the connecting sleeve are both high-strength fiber webbing with a webbing width of 140-160mm and a tensile strength of >500MPa.

[0025] The present invention provides an automatic unfolding helicopter landing pad, which is prepared by the above method. Its cross-section in the folded state is a W-shaped rolled structure, and when unfolded, it becomes a circular bearing surface with a diameter of ≥10m.

[0026] According to the automatic deploying helicopter landing pad of the present invention, a fuse device is provided on the bundled structure with a W-shaped cross section, the fuse head contacts the rope, and the fuse device adopts remote control fusing.

[0027] It can be seen from the above technical solutions that compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention can be deployed quickly and automatically: through the linkage design of the torsion spring preset elastic force and the remote fuse rope, the landing pad can be automatically deployed from the folded state to the fully deployed state, with a deployment time of ≤ 3 minutes, which is significantly better than the traditional assembled landing pad (which takes more than 30 minutes).

[0029] 2. The present invention has the advantages of light weight and high load-bearing capacity: the combination of ultra-high-strength polyethylene fiber base cloth (tensile strength 400MPa) and fiber-reinforced resin support ribs (bending strength 500MPa) is suitable for complex terrains such as soft sand and Gobi.

[0030] 3. The present invention is foldable and portable: through the W-shaped bundling and folding design, the volume is compressed to at least 1 / 8 of the original area, which is convenient for helicopter airdrop transportation and can be automatically unfolded without manual disassembly.

[0031] 4. The present invention has good environmental adaptability: it ensures that the landing platform is resistant to wind and sand, corrosion, and is suitable for harsh environments such as high temperature and humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0033] Figure 1 A flow chart of a method for preparing an automatically spreading helicopter landing pad provided by the present invention;

[0034] Figure 2 A schematic diagram of a unit block structure of an automatic helicopter landing pad provided by the present invention;

[0035] Figure 3 A schematic diagram of the connection between the first length support rib and the torsion spring is shown;

[0036] Figure 4 It shows a schematic diagram of the state after multiple unit blocks are spliced together;

[0037] Figure 5 A schematic diagram shows the state of multiple unit blocks after being spliced and folded. DETAILED DESCRIPTION

[0038] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0039] Existing mobile helicopter landing pads have the disadvantages of low deployment efficiency, insufficient portability, high cost, and are easily affected by environmental factors and instability.

[0040] In view of this, the solution provided by the present invention is a method for preparing an automatically spreading helicopter landing pad, see the attached Figure 1 , including the following steps:

[0041] S1. Prepare the base fabric of the landing platform; S2. Cut and sew the base fabric: Cut the base fabric into multiple unit blocks, and sew the cut unit blocks into double layers; S3. Install support ribs and torsion springs: According to the design requirements, insert support ribs into each double-layer sewn unit block, and install multiple torsion springs on some of the support ribs; S4. Install the edge and connecting sleeves: Sew the edge of each unit block, and install multiple separated connecting sleeves on the edge. The connecting sleeves on adjacent unit blocks are staggered. When splicing, the connecting sleeves on both sides are inserted at the separation position to form a whole The connecting channel of the body; S5, splicing: Using connecting sleeves and connecting ribs, multiple unit blocks are spliced into a circular landing pad. Torsion springs are also installed at the corresponding parts of the connecting ribs where the torsion springs are installed. The connecting ribs are inserted into the connecting channel to quickly splice the multiple unit blocks into a whole; S6, folding and packaging: The spliced landing pad can be folded multiple times as needed at the torsion spring installation points to form an umbrella-shaped structure (similar to a folding umbrella), and then tied into a roll with ropes to form a self-expanding helicopter landing pad product. When the ropes are released, the torsion springs release pressure and open, automatically unfolding into a circular landing pad. Steps S3 and S4 are interchangeable.

[0042] In the embodiment of the present invention, S1 uses ultra-high strength polyethylene fiber to weave into a base fabric, the base fabric has a tensile strength of ≥400 MPa and a density of 250-300 g / m 2 S2 uses ultra-high-strength polyethylene fiber multi-strand yarn for double-layer sewing, and the tensile strength of the sewing line is ≥2000MPa.

[0043] The support ribs used in S3 and the connecting ribs in S5 are both made of fiber-reinforced resin-based composite materials with a bending strength greater than or equal to 500 MPa and a diameter of 18-20 mm.

[0044] In the present invention, see the attached Figure 2 and 3 The support ribs include first-length support ribs, second-length support ribs, third-length support ribs, and fourth-length support ribs. The connecting ribs have the same structure as the first-length support ribs, with the length of the connecting ribs = the length of the first-length support ribs > the length of the second-length support ribs > the length of the third-length support ribs > the length of the fourth-length support ribs. Each unit block contains one connecting rib, four first-length support ribs, four second-length support ribs, four third-length support ribs, and twelve fourth-length support ribs. Each unit block is supported by the connecting ribs, first-length support ribs, second-length support ribs, third-length support ribs, and fourth-length support ribs to form a fan-shaped structure. The connecting ribs, first-length support ribs, second-length support ribs, and third-length support ribs are all disconnected at the folding position, and torsion springs are installed at the disconnected positions to provide elastic recovery force after folding.

[0045] The rope in S6 is made of synthetic fiber, and the release rope adopts remote high-temperature melting rope method.

[0046] The surface of the S5 circular landing pad has anti-slip textures. The edging material and connecting sleeve are made of high-strength fiber webbing. The webbing width can be 150mm and the tensile strength is greater than 500MPa.

[0047] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0048] See attached Figure 2-5 The present invention also provides an automatically deployable helicopter landing pad fabricated by the method, comprising a plurality of unit blocks Y prefabricated and spliced to form a circular bearing surface with a diameter of 10 m or greater, and a roll structure with a W-shaped cross-section when folded. A fuse device is provided on the W-shaped roll structure, with the fuse head contacting a rope, and the fuse device is remotely controlled.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0050] For details, see the attached Figure 2 Each of the unit blocks Y includes support ribs 200 (first length support ribs 201, second length support ribs 202, third length support ribs 203, and fourth length support ribs 204), a rim 300, a connecting sleeve 400, and a torsion spring 500; wherein the first length support ribs 201 may be four, each of which may be 4.85 m in length, and at least one connecting rib has the same structure and length as the first length support rib 201; the second length support ribs 202 may be four, each of which may be 4.5 m in length, and the third length support ribs 203 may be four The number of the fourth length support ribs 204 can be 12 and the length can be 2.5 m. With the vertex of the fan-shaped unit block as the center of the circle, the four first length support ribs 201 and the connecting ribs are disconnected at R50, R110, and R250 respectively, and torsion springs 500 are installed at the disconnected positions. That is, three torsion springs 500 are installed on each first length support rib 201 or connecting rib, two torsion springs are installed on each second length support rib 202, and one torsion spring is installed on each third length support rib 203.

[0051] Arrangement of support bars: The first-length support bars (4.85m) are evenly distributed along the radial direction of the circular landing platform as the main load-bearing skeleton. The second-length support bars (4.5m) are arranged outward from R50, with two bars distributed on both sides of a first-length support bar to form a secondary support network. The third-length support bars (3.9m) are arranged outward from R110, with two bars symmetrically arranged on both sides of two second-length support bars (4.5m) with a first-length support bar as the central axis. The third-length support bars (2.5m) are arranged outward from R250 and distributed at the edge of the unit block, with two bars symmetrically arranged on both sides of all outward-extending support bars.

[0052] Torsion spring selection: Use stainless steel spiral torsion spring with a torsional stiffness of ≥50N·m / rad. The pre-twisting angle during installation should be ≥180° to ensure that the elastic force is sufficient to overcome the folding resistance of the base fabric.

[0053] Instructions for folding into a W-shaped roll structure:

[0054] Folding starting point: Spread the assembled circular landing pad flat on the ground, take the center of the circle as the starting point, and divide the folding area into preset fan-shaped unit blocks.

[0055] Layered folding: Fold in sequence according to the corresponding torsion spring installation positions at R50, R110, and R250 to form a double-layer wave (with a W-shaped cross-section). At this time, the bending stiffness of the support ribs (especially the longer support ribs) limits excessive deformation, ensuring a compact structure after folding.

[0056] Bundling and fixing: Use synthetic fiber ropes to bundle along the crests and troughs of the W-shaped folding structure with a spacing of ≤0.5m to ensure the stability of the folding state.

[0057] Optimized folding path: The connecting sleeves at the edges of the fan-shaped unit blocks form hinge points with the connecting ribs, guiding the folding direction and preventing base fabric distortion or rib misalignment. The corresponding connecting sleeve at R250 is 2-2.5 times longer than those at other locations.

[0058] The automatic expansion process of the present invention triggers:

[0059] Remote fuse rope: Send a command through the remote control, the circuit board in the fuse device is powered on, the hot melt head heats up to above 300℃, the synthetic fiber rope (melting point ≤ 250℃) is melted, and the binding constraint is released (see Figure 4 ).

[0060] Torsion spring-driven deployment: After the initial spring action and the cable melts, the torsion spring (in its stored energy state) instantly releases its force, pushing the connecting ribs, first-length support ribs 201, second-length support ribs 202, and third-length support ribs 203 back to a straight state, driving the adjacent sector-shaped units to expand in all directions. During coordinated deployment, the fourth-length support rib 204, hinged to the connecting ribs via a connecting sleeve, is passively straightened during the long support rib deployment process, forming a stable radial support network and ensuring rapid flattening of the circular bearing surface.

[0061] Final Lock: When all support ribs are fully extended to the designed angle, the connecting sleeve and the connecting rib's snap-fit structure (such as an elastic pin) automatically lock to prevent secondary folding. After unfolding, the circular landing pad's diameter error is ≤0.2m, and the surface flatness deviation is ≤5cm, meeting the stability requirements for helicopter takeoff and landing.

[0062] Remote fusing device, circuit control module: Integrates a wireless receiver (such as a LoRa module), temperature control circuit, and lithium battery. The thermal fuse head uses nickel-chromium alloy wire, and heats up to the melting threshold within 3 seconds after power is applied. For fuse safety, the thermal fuse head is covered with a ceramic insulation layer to prevent high temperature damage to the base fabric, and it only activates after receiving an encrypted command.

[0063] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0064] A specific application scenario of the present invention is to roll up the W-shaped bundle and drop it to the target area during emergency rescue in the Gobi Desert. Operation process:

[0065] 1. The helicopter hovers to a height of 50m above the ground and drops the landing pad (which can be equipped with built-in cushioning airbags to reduce impact).

[0066] 2. Rescuers send a fuse command through a handheld terminal. The rope fuses within 0.5 seconds, and the torsion spring drives the landing platform to automatically deploy within 120 seconds.

[0067] 3. After the helicopter landed on the deployed landing pad, testing showed that the maximum depression depth of the bearing surface was ≤ 2 cm, meeting the requirements for safe takeoff and landing.

[0068] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0069] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for preparing an automatically spreading helicopter landing pad, characterized in that: The following steps are involved: S1, preparing the landing pad base fabric; S2. Cutting and sewing the base fabric: cutting the base fabric into a plurality of unit blocks, and sewing the cut unit blocks into double layers; S3. Install support ribs and torsion springs: According to the design requirements, insert support ribs into each double-layer sewn unit block, and install multiple torsion springs on some of the support ribs; S4, hemming and connecting sleeve installation: sew the edges of each unit block and install the connecting sleeve on the hemming; steps S3 and S4 are interchangeable; S5. Splicing: Splice multiple unit blocks into a circular landing platform through connecting sleeves and connecting ribs, and install torsion springs at the corresponding parts of the supporting ribs on the connecting ribs; S6. Folding packaging: Fold the spliced landing pad multiple times at the torsion spring installation position to form an umbrella-shaped structure, and bundle it into a roll with ropes to form a self-expanding helicopter landing pad product; When the rope is released, the torsion spring releases pressure and opens, automatically unfolding into a circular landing pad.

2. The method for preparing an automatically spreading helicopter landing pad according to claim 1, characterized in that: S1 uses ultra-high strength polyethylene fiber to weave the base fabric, the base fabric has a tensile strength of ≥400MPa and a density of 250-300g / m 2 .

3. The method for preparing an automatically spreading helicopter landing pad according to claim 1, characterized in that: S2 uses multiple strands of ultra-high-strength polyethylene fiber yarn for double-layer sewing, and the tensile strength of the sewing line is ≥2000MPa.

4. The method for preparing an automatically spreading helicopter landing pad according to claim 1, characterized in that: The support ribs used in S3 and the connecting ribs in S5 are both made of fiber-reinforced resin-based composite materials with a bending strength greater than or equal to 500 MPa and a diameter of 18-20 mm.

5. The method for preparing an automatically spreading helicopter landing pad according to claim 4, characterized in that: The supporting ribs include first-length supporting ribs, second-length supporting ribs, third-length supporting ribs and fourth-length supporting ribs. The length of the connecting ribs = the length of the first-length supporting ribs > the length of the second-length supporting ribs > the length of the third-length supporting ribs > the length of the fourth-length supporting ribs. Each unit block has one connecting rib, four first-length supporting ribs, four second-length supporting ribs, four third-length supporting ribs and twelve fourth-length supporting ribs.

6. The method for preparing an automatically spreading helicopter landing pad according to claim 5, characterized in that: Each unit block is supported by connecting ribs, first length support ribs, second length support ribs, third length support ribs and fourth length support ribs to form a fan-shaped structure. The connecting ribs, first length support ribs, second length support ribs and third length support ribs are all disconnected at the folding position, and torsion springs are installed at the disconnected position to provide elastic recovery force after folding.

7. The method for preparing an automatically spreading helicopter landing pad according to claim 1, characterized in that: The rope in S6 is made of synthetic fiber, and the release rope adopts remote high-temperature melting rope method.

8. The method for preparing an automatically spreading helicopter landing pad according to claim 1, characterized in that: The surface of the circular landing pad in S5 has anti-slip texture. The edging material and the connecting sleeve are both high-strength fiber webbing. The webbing width is 140-160mm and the tensile strength is greater than 500MPa.

9. An automatic spreading helicopter landing pad, characterized in that: Prepared by the method of any one of claims 1-8, the cross-section of the folded state is a W-shaped bundle structure, and when unfolded, it is a circular bearing surface with a diameter of ≥10m.

10. The automatic deployable helicopter landing pad according to claim 9, characterized in that: A fuse device is provided on the bundle structure with a W-shaped cross section, and a fuse head contacts the rope. The fuse device adopts remote control fusing.

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