Flexible pull-down cable for helicopter landing
By adopting a flexible hull composed of a multi-strand parallel rope strand structure and conductive fiber mixed twist yarn, the impact problem caused by deck motion in high sea conditions is solved, and the effect of improving safety is achieved and the ultimate load setting for different usage needs is met.
Patent Information
- Application Number
- CN202411434622.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-03-07
AI Technical Summary
Carrier-based helicopters may have violent collisions with the deck due to multiple degrees of freedom movement on the deck in high sea conditions, which may easily cause major damage to the landing gear or the structure of the fuselage. At the same time, pulling hulls are often used to have large weight, strong stiffness and large storage radius.
A flexible pull-down cable is used, which consists of a rope core of a multi-strand parallel rope strand structure and a cladding layer of conductive fiber mixed yarn. The rope core accounts for no less than 60% of the total mass of the pull-down cable, and a pull-down cable with an annular component is formed by sewing.
It improves the slight elasticity and safety of the flexible pulling down cable, and end fractures when withstand the limit force value under high sea conditions to avoid collision between helicopters and ships, ensuring safety; the limit load of the pulling down cable can be set in the range of 10 to 85% of the fracture strength to meet different needs.
Smart Images
Figure CN119568422A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of helicopter landing, and in particular relates to a flexible rappelling cable for helicopter landing. Background Art
[0002] The operating environment of ship-borne helicopters is complex. They are affected by many factors, such as the movement of the ship, the wake generated by the ship's superstructure, and the limited landing area on the flight deck. The safety of helicopter landing has become a difficulty restricting the development of ship-borne helicopters, and various landing aids have emerged.
[0003] The landing aids are mainly divided into three categories: the pull-down type, the harpoon-grid type and the landing aid net type. Among them, the pull-down type landing aid is mainly composed of the guide rope, guide rope winch, main probe, tail probe installed on the helicopter and the pull-down rope and pull-down winch, clamping mechanism and control room installed on the ship. When the helicopter is preparing to land, it hovers above the flight deck, releases the main probe, and extends a guide rope from the main probe; the crew on the deck uses a grounding clamp to connect the guide rope with the pull-down rope on the deck, and then the helicopter pilot starts the guide rope winch on the helicopter to retract the guide rope, pulls the pull-down rope into the helicopter and secures it; the deck pilot starts the pull-down winch to retract the pull-down rope, and at the same time the pilot controls the helicopter to make the helicopter generate lift consistent with the rise and fall of the ship's deck, ensuring that the rise and fall of the helicopter under the action of the pull-down rope is synchronized with the rise and fall of the ship's deck; the helicopter is pulled and landed under the pulling force of the pull-down winch; after the helicopter lands, the main probe is inserted into the clamping mechanism on the deck, and the pilot quickly controls the clamping to tie the helicopter to the deck; then the pilot releases the tail probe on the helicopter, and the tail probe is stuck in the grille on the flight deck to secure the tail, completing the helicopter landing process.
[0004] During helicopter landing, the multi-degree-of-freedom movement of the deck under high sea conditions causes the helicopter to collide violently with the deck, which can easily cause serious damage to the landing gear or the fuselage structure. In addition, the commonly used rappelling rope is a steel wire rope, which has technical problems such as heavy weight, strong rigidity, and large storage radius. Summary of the invention
[0005] In view of this, some embodiments disclose a flexible rappelling cable for helicopter landing, the flexible rappelling cable comprising a rappelling cable body and a rappelling cable ring disposed at an end of the rappelling cable body;
[0006] The rappelling rope body comprises a rope core and a coating layer coated on the outside of the rope core, the rope core is composed of a plurality of rope core strands, and the rope core strands are made of a plurality of rope core yarns; the coating layer is woven from a plurality of rope skin strands, and the rope skin strands contain at least one strand of conductive fiber mixed twisted yarn; the mass ratio of the rope core to the rappelling rope body is not less than 60%, and the ratio of the thickness of the rope core to the thickness of the coating layer is 0.1 to 0.3; the rappelling rope ring is an annular component obtained by weaving an eye ring at the end of the rappelling rope body.
[0007] Furthermore, in some embodiments of the flexible helicopter landing rope disclosed, the rope core and rope strands are twisted rope strands formed by twisting a plurality of rope yarns.
[0008] Some embodiments disclose a flexible helicopter landing rappelling rope, wherein the rope core and rope strands are braided rope strands, which are braided from a plurality of rope yarns.
[0009] Some embodiments disclose a flexible rappelling rope for helicopter landing, wherein the number of rope core strands is 3, 8 or 12.
[0010] Some embodiments disclose flexible rappelling cables for helicopter landing, wherein the core and yarns are a combination of one or more of polyamide fibers, polyester fibers, ultra-high molecular weight polyethylene fibers, and aramid fibers.
[0011] Some embodiments disclose a flexible rappelling rope for helicopter landing, wherein the number of rope skin strands is 24, 36 or 48.
[0012] Some embodiments disclose a flexible rappelling cable for helicopter landing, wherein the rope skin and rope strands are one of polyamide fibers, polyester fibers, and ultra-high molecular weight polyethylene fibers.
[0013] In some embodiments of the flexible helicopter landing cable disclosed, the conductive fiber mixed yarn contains conductive fibers, and the conductive fibers are a combination of one or more of carbon fibers, metal fibers, and conductive metal compound fibers.
[0014] In some embodiments of the flexible helicopter landing cable disclosed, the end of the cable body is rotated and sewn into one piece with the cable body to form an annular component.
[0015] Some embodiments disclose flexible helicopter landing cables, wherein the sewing length between the end of the cable body and the cable body is determined by the limit force value of the cable body, and the limit force value of the cable body is 10-85% of the breaking strength of the cable body.
[0016] The flexible rappelling rope for helicopter landing disclosed in the embodiment of the present invention has a rope core with a multi-strand parallel rope structure, high elongation, and improved micro-elastic performance of the flexible rappelling rope; the coating layer contains a mixed twisted yarn of conductor fibers, which has an anti-static function and improves the safety of use; in a high sea condition environment, when the bearing capacity of the flexible rappelling rope reaches the limit force value, the end of the flexible rappelling rope breaks, the rappelling rope is pulled out, and the helicopter is separated from the rappelling device, avoiding the collision between the helicopter and the ship, ensuring the safety of personnel and equipment; the rappelling rope ring formed by sewing at the end of the flexible rappelling rope enables the rappelling rope to have different limit loads, and the limit load can be set within the range of 10-85% of the breaking strength of the rappelling rope to meet different use requirements. The flexible rappelling rope for helicopter landing has a small linear density, high breaking strength, and large elongation, and has the characteristics of soft fiber rope, light weight, and small storage radius, and has good application prospects in the field of helicopter landing. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the structure of the flexible rappelling cable for a helicopter disclosed in Example 1;
[0018] Figure 2 This is a schematic diagram of the structure of a flexible helicopter rappelling cable disclosed in Example 2;
[0019] Figure 3 This is a schematic diagram of a rappelling cable ring for a flexible rappelling cable for a helicopter disclosed in Example 3.
[0020] Reference numerals
[0021] 1 core 2 covering layer
[0022] 3 pull-down rope ring 11 inner core twisted rope strands
[0023] 12 inner core braided rope strands 21 rope leather rope strands
[0024] 22 Conductive fiber mixed yarn 31 Sewing thread DETAILED DESCRIPTION
[0025] The word "embodiment" used herein as an "exemplary" does not necessarily mean that any embodiment described is superior or better than other embodiments. Performance index tests in the embodiments of the present invention are performed using conventional test methods in the art unless otherwise specified. It should be understood that the terms described in the embodiments of the present invention are only used to describe specific implementation methods and are not intended to limit the contents disclosed in the embodiments of the present invention.
[0026] Unless otherwise specified, the technical and scientific terms used herein have the same meanings as commonly understood by ordinary technicians in the technical field to which the embodiments of the present invention belong; other experimental methods and technical means not specifically specified in the embodiments of the present invention refer to experimental methods and technical means commonly used by ordinary technicians in the field.
[0027] The terms "substantially" and "approximately" used herein are used to describe small fluctuations. For example, they can refer to less than or equal to ±5%, such as less than or equal to ±2%, such as less than or equal to ±1%, such as less than or equal to ±0.5%, such as less than or equal to ±0.2%, such as less than or equal to ±0.1%, such as less than or equal to ±0.05%. The numerical data represented or presented in the range format herein are used only for convenience and brevity, and should therefore be flexibly interpreted as including not only the values clearly listed as the limits of the range, but also all independent values or sub-ranges contained in the range. For example, the numerical range of "1-5%" should be interpreted as including not only the clearly listed values of 1% to 5%, but also the independent values and sub-ranges within the range shown. Therefore, independent values such as 2%, 3.5% and 4% and sub-ranges such as 1%-3%, 2%-4% and 3%-5% are included in this numerical range. This principle also applies to the range of only one numerical value. In addition, such an interpretation applies regardless of the width of the range or the characteristics described.
[0028] In this document, including in the claims, transitional words such as "comprises," "includes," "with," "having," "containing," "involving," "accommodating," etc. are understood to be open-ended, i.e., meaning "including but not limited to." Only the transitional words "consisting of" and "composed of" are closed transitional words.
[0029] In order to better illustrate the present invention, numerous specific details are provided in the specific examples below. It should be understood by those skilled in the art that the present invention can be implemented without certain specific details. In the embodiments, some methods, means, instruments, equipment, etc. well known to those skilled in the art are not described in detail in order to highlight the gist of the present invention.
[0030] Under the premise of no conflict, the technical features disclosed in the embodiments of the present invention may be arbitrarily combined, and the resulting technical solutions belong to the contents disclosed in the embodiments of the present invention.
[0031] In some embodiments, a flexible rappelling cable for helicopter landing includes a rappelling cable body and a rappelling cable ring arranged at the end of the rappelling cable body; wherein the rappelling cable body includes a rope core and a coating layer coated on the outside of the rope core, the rope core is composed of a plurality of rope core strands, and the rope core strands are made of a plurality of rope core yarns; the coating layer is woven from a plurality of rope skin strands, and the rope skin strands contain at least one strand of conductive fiber mixed twisted yarn; the rappelling cable ring is an annular component obtained by weaving an eye ring at the end of the rappelling cable body.
[0032] Usually, the rope core is formed by multiple rope core strands in parallel, and the formed rope core has a parallel rope strand structure and a high elongation, which is beneficial to improve the micro-elastic performance of the rappelling rope; the coating layer is woven from multiple rope skin strands on the outside of the rope core, and usually at least one rope skin strand contains at least one strand of conductive fiber mixed twisted yarn, so the woven coating layer has conductive properties and can prevent static electricity. The coating layer with anti-static function makes the rappelling rope have high safety performance in use. The end of the rappelling rope body is woven into a rappelling rope ring in an eye ring manner, and the rappelling rope ring can be interconnected with the set position of the ship deck or helicopter to realize the connection between the helicopter flexible rappelling rope and the helicopter or ship deck.
[0033] The descent cable ring provided at the end of the descent cable body can be provided at one end of the descent cable body, or at both ends of the descent cable body.
[0034] Generally, the rappelling rope eyelet of the flexible rappelling rope is formed by weaving an eyelet at the end of the flexible rappelling rope body. During the process of weaving the eyelet, the end of the rappelling rope body is rotated to a set length, and the end of the rappelling rope body with the set length is rotated and arranged in parallel with the rappelling rope body, and then the two are connected to each other as a whole by sewing. The sewing part forms the rappelling rope body into a ring shape as the rappelling rope eyelet. Generally, the sewing part extends along the length direction of the rappelling rope body by a set length, that is, the sewing length.
[0035] Usually the sewing length can be set according to the needs of use. In some embodiments of the flexible helicopter landing cable, the sewing length between the end of the cable body and the cable body is determined by the limit force value of the cable body, and the limit force value of the cable body is 10-85% of the breaking strength of the cable body.
[0036] Some embodiments disclose a flexible helicopter landing rappelling rope, wherein the rope core and rope strands are twisted rope strands formed by twisting a plurality of rope yarns.
[0037] Some embodiments disclose a flexible helicopter landing rappelling rope, wherein the rope core and rope strands are braided rope strands, which are braided from a plurality of rope yarns.
[0038] Some embodiments disclose a flexible helicopter landing rappelling rope, wherein the braiding structure of the rope core and rope strands is 3, 8 or 12; generally, the rope core is braided from 3, 8 or 12 rope core and rope strands.
[0039] Some embodiments disclose flexible rappelling cables for helicopter landing, wherein the core and yarns are a combination of one or more of polyamide fibers, polyester fibers, ultra-high molecular weight polyethylene fibers, and aramid fibers.
[0040] Some embodiments disclose a flexible rappelling rope for helicopter landing, wherein the number of rope skin strands is 24, 36 or 48.
[0041] Some embodiments disclose a flexible rappelling cable for helicopter landing, wherein the rope skin and rope strands are one of polyamide fibers, polyester fibers, and ultra-high molecular weight polyethylene fibers.
[0042] In some embodiments of the flexible helicopter landing cable disclosed, the conductive fiber mixed yarn contains conductive fibers, and the conductive fibers are a combination of one or more of carbon fibers, metal fibers, and conductive metal compound fibers.
[0043] The technical details are further illustrated below in conjunction with embodiments.
[0044] Example 1
[0045] Figure 1 This is a schematic diagram of the structure of the flexible rappelling cable for a helicopter disclosed in Example 1;
[0046] The flexible helicopter rappelling cable disclosed in Example 1 is a flexible helicopter rappelling cable for landing with an emergency escape function; the flexible rappelling cable comprises a rappelling cable body, the rappelling cable body comprises a rope core 1 and a coating layer 2 coated on the outside of the rope core 1, and the end of the rappelling cable body is formed into a rappelling cable ring 3 in an eye-weaving manner;
[0047] The rope core 1 comprises a plurality of inner core twisted rope strands 11 arranged in parallel, and the inner core twisted rope strands 11 are twisted from three polyamide fiber rope yarns;
[0048] The covering layer 2 is woven from 48 rope strands 21, which are twisted from a plurality of polyamide fibers, one of which is a conductive fiber mixed twisted yarn 22, which is twisted from a plurality of carbon fibers and polyamide fibers;
[0049] The rappelling rope ring 3 is formed by sewing the end of the rappelling rope body and the rappelling rope body with a sewing thread 31; the sewing thread 31 is formed by twisting a plurality of strands of polyamide fibers through a twisting machine.
[0050] The helicopter flexible rappelling cable disclosed in Example 1 has a sewing length of 10 cm between the end of the rappelling cable body and the rappelling cable body, a breaking strength of 49 kN, and a limit force value of 39.5 kN, which is 80.6% of the breaking strength of the rappelling cable body.
[0051] Example 2
[0052] Figure 2 This is a schematic diagram of the structure of a flexible helicopter rappelling cable disclosed in Example 2;
[0053] The flexible helicopter rappelling cable disclosed in Example 2 is a flexible helicopter rappelling cable for landing with an emergency escape function; the flexible rappelling cable comprises a rappelling cable body, the rappelling cable body comprises a rope core 1 and a coating layer 2 coated on the outside of the rope core 1, and the end of the rappelling cable body is formed into a rappelling cable ring 3 in an eye-weaving manner;
[0054] The rope core 1 comprises a plurality of parallel inner core braided rope strands 12, wherein the inner core braided rope strands 12 are braided by three ultra-high molecular weight polyethylene fiber twisted wires; the ultra-high molecular weight polyethylene twisted wires are formed by twisting a plurality of ultra-high molecular weight polyethylene fibers through a twisting machine;
[0055] The covering layer 2 is woven from 48 rope strands 21, which are twisted from a plurality of polyester fibers, one of which is a conductive fiber mixed twisted yarn 22, which is twisted from a plurality of carbon fibers and polyester fibers;
[0056] The rappelling rope ring 3 is formed by sewing the end of the rappelling rope body and the rappelling rope body with a sewing thread 31; the sewing thread 31 is formed by twisting a plurality of strands of polyamide fibers through a twisting machine.
[0057] Example 3
[0058] Figure 3 This is a schematic diagram of a rappelling cable ring for a flexible rappelling cable for a helicopter disclosed in Example 3.
[0059] In the third embodiment, the rappelling cable ring 3 is formed by sewing the end of the rappelling cable body and the rappelling cable body with a sewing thread 31 .
[0060] The flexible rappelling rope for helicopter landing disclosed in the embodiment of the present invention has a rope core with a multi-strand parallel rope structure, high elongation, and improved micro-elastic performance of the flexible rappelling rope; the coating layer contains a mixed twisted yarn of conductor fibers, which has an anti-static function and improves the safety of use; in a high sea condition environment, when the bearing capacity of the flexible rappelling rope reaches the limit force value, the end of the flexible rappelling rope breaks, the rappelling rope is pulled out, and the helicopter is separated from the rappelling device, avoiding the collision between the helicopter and the ship, ensuring the safety of personnel and equipment; the rappelling rope ring formed by sewing at the end of the flexible rappelling rope enables the rappelling rope to have different limit loads, and the limit load can be set within the range of 10-85% of the breaking strength of the rappelling rope to meet different use requirements. The flexible rappelling rope for helicopter landing has a small linear density, high breaking strength, and large elongation, and has the characteristics of soft fiber rope, light weight, and small storage radius, and has good application prospects in the field of helicopter landing.
[0061] The technical solutions disclosed in the embodiments of the present invention and the technical details disclosed in the embodiments are merely illustrative of the inventive concept of the present invention and do not constitute a limitation on the technical solutions of the embodiments of the present invention. Any conventional changes, replacements or combinations of the technical details disclosed in the embodiments of the present invention have the same inventive concept as the present invention and are within the protection scope of the claims of the present invention.
Claims
1. A flexible rappelling cable for helicopter landing, characterized in that: The flexible rappelling cable comprises a rappelling cable body and a rappelling cable ring arranged at the end of the rappelling cable body; The rappelling rope body comprises a rope core and a coating layer coated on the outside of the rope core, the rope core is composed of a plurality of rope core strands, and the rope core strands are made of a plurality of rope core yarns; the coating layer is woven from a plurality of rope skin strands, and the rope skin strands contain at least one strand of conductive fiber mixed twisted yarn; the mass ratio of the rope core to the rappelling rope body is not less than 60%, and the ratio of the thickness of the rope core to the thickness of the coating layer is 0.1 to 0.3; The rappelling rope ring is an annular component obtained by weaving an eye ring at the end of the rappelling rope body.
2. The flexible rappelling cable for helicopter landing according to claim 1 is characterized in that: The rope core strands are twisted rope strands formed by twisting a plurality of rope yarns.
3. The flexible rappelling cable for helicopter landing according to claim 1, characterized in that: The rope core strands are braided rope strands, which are braided from a plurality of rope yarns.
4. The flexible rappelling cable for helicopter landing according to claim 1 is characterized in that: The braiding structure of the rope core and rope strands is 3, 8 or 12.
5. The flexible rappelling cable for helicopter landing according to claim 1, characterized in that: The core rope yarn is a combination of one or more of polyamide fiber, polyester fiber, ultra-high molecular weight polyethylene fiber and aramid fiber.
6. The flexible rappelling cable for helicopter landing according to claim 1, characterized in that: The number of the rope skin strands is 24, 36 or 48.
7. The flexible rappelling cable for helicopter landing according to claim 1, characterized in that: The rope skin and rope strands are one of polyamide fiber, polyester fiber and ultra-high molecular weight polyethylene fiber.
8. The flexible rappelling cable for helicopter landing according to claim 1, characterized in that: The conductive fiber mixed twisted yarn contains conductive fibers, and the conductive fibers are a combination of one or more of carbon fibers, metal fibers, and conductive metal compound fibers.
9. The flexible rappelling cable for helicopter landing according to claim 1, characterized in that: The end of the rappelling cable body is rotated and sewn together with the rappelling cable body to form an annular component.
10. The flexible rappelling cable for helicopter landing according to claim 9, characterized in that: The sewing length between the end of the cable body and the cable body is determined by the limit force value of the cable body, and the limit force value of the cable body is 10-85% of the breaking strength of the cable body.