High strength low elongation static rope and method of braiding the same

Abstract

The application relates to the field of rescue equipment, in particular to a high-strength low-elongation static force rope and a weaving method thereof, the high-strength low-elongation static force rope comprising a rope core and a sheath outside the rope core, the rope core being woven by three strands of ropes arranged in an equilateral triangle, and each strand of rope being woven by an 8-spindle, 12-spindle or 16-spindle weaving machine. The rope core of the application adopts three strands of ropes to form an equilateral stable structure, effectively disperses external force applied on the static force rope, provides a breaking strength far exceeding the average breaking force, maintains a compact structure, has more stable control force, avoids sliding of the sheath, can be perfectly matched with equipment meeting the EN 341:2011 standard, has better braking force, and is stable in speed under high-load operation conditions; through pre-drawing and post-treatment, the elongation of the fiber is reduced while the strength is improved, so that the requirement of high strength and low elongation is met.

Description

Technical Field

[0001] This invention relates to the field of rescue equipment, and in particular to a high-strength, low-elongation static rope and its weaving method. Background Technology

[0002] Static ropes, characterized by high strength and low elongation, are mainly used in caving and rescue equipment. They are also used as safety ropes for rappelling and climbing gyms. Traditional ropes often only have single-braid and double-braid structures, which have problems such as insufficient strength and excessive elongation, and cannot meet the stable bearing capacity of heavy loads. Summary of the Invention

[0003] This invention aims to solve the above problems and provides a high-strength, low-elongation static rope and its weaving method. The technical solution adopted is as follows:

[0004] A high-strength, low-elongation static rope includes a rope core and an outer sheath. The rope core is woven from three strands arranged in parallel equilateral triangles, and each strand is woven by an 8-spindle, 12-spindle, or 16-spindle braiding machine.

[0005] Based on the above scheme, the rope core and sheath are made of nylon, polyester or aramid.

[0006] The above-mentioned method for weaving high-strength, low-elongation static ropes includes:

[0007] S1. A twisted yarn that combines and twists multiple yarns to form a rope core;

[0008] S2. Combining and twisting multiple yarns to weave a sheath-like twisted yarn;

[0009] S3. The twisted strands of the rope core are braided into a strand that serves as the rope core using an 8-spindle, 12-spindle, or 16-spindle braiding machine.

[0010] S4. The rope core is made by weaving three strands of rope in parallel equilateral triangles.

[0011] S5. Pre-stretch the rope core;

[0012] S6. Multiple sheaths are wrapped around the rope core and woven into a sheath using a 24-spindle, 32-spindle, or 48-spindle braiding machine;

[0013] S7. Dry and shape the entire rope core and sheath using electric heating air or infrared drying.

[0014] Based on the above scheme, in step S5, the pre-stretching draw ratio is 105%-180%.

[0015] Preferably, in step S5, multiple strands of rope are stretched simultaneously.

[0016] Preferably, the processing temperature of the electric heating air blower or infrared drying is 100℃-150℃, and the processing time is 3min-20min.

[0017] Preferably, the high-strength, low-elongation static rope has a diameter of 8.5-16mm, the diameter of the sheath accounts for 25%-55%, the number of yarn ends in the rope core is 10-70, and the number of yarn ends in the sheath is 10-70.

[0018] The beneficial effects of this invention are as follows: the rope core adopts an equilateral stable structure composed of 3 strands, which effectively disperses the external force applied to the static rope, provides a breaking strength far exceeding the average destructive force, maintains a compact structure, has more stable control force, avoids slippage of the sheath, can be perfectly matched with equipment that conforms to EN 341:2011 standard, has better braking force, and maintains stable speed under high load operating conditions; through pre-stretching and post-treatment, the strength is improved while the fiber elongation is reduced, achieving the requirements of high strength and low elongation. Attached Figure Description

[0019] Figure 1 : Schematic diagram of the structure of the present invention;

[0020] Figure 2 Cross-sectional view of the present invention. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] In the description of this invention, it should be understood that the terms "center," "length," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," and "inner," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and 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, and therefore should not be construed as a limitation of the invention. 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 indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0024] In this invention, unless otherwise explicitly 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 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 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.

[0025] like Figure 1 and Figure 2 As shown, a high-strength, low-elongation static rope includes a rope core 1 and a sheath 2 surrounding the rope core 1. The rope core 1 is woven from three strands arranged in a parallel equilateral triangle, with each strand woven by an 8-spindle, 12-spindle, or 16-spindle braiding machine. The rope core 1 and the sheath 2 are made of nylon, polyester, or aramid.

[0026] The above-mentioned method for weaving high-strength, low-elongation static ropes includes:

[0027] S1. Combine and twist multiple yarns to form the twisted yarn of rope core 1;

[0028] S2. Combine and twist multiple yarns to weave a twisted yarn into sheath 2;

[0029] S3. The twisted strands of the core 1 are braided into small ropes using an 8-spindle, 12-spindle, or 16-spindle braiding machine in an 8-spindle pattern to serve as the strands of the core 1.

[0030] S4. Three strands of rope are braided in a parallel equilateral triangle to form rope core 1. Using these three rope cores, the tension of the rope cores is controlled by the equipment to maintain a consistent tension, forming a stable equilateral triangle structure. When subjected to external impact, all three sides are stressed simultaneously, significantly increasing the strength compared to ropes without a stable equilateral triangle structure. Simultaneously, the central cavity of the three-sided equilateral stable structure has a uniform gap structure, which effectively disperses force and absorbs impact energy when subjected to impact, thus meeting the relevant specifications for impact force and number of impacts.

[0031] S5. The core rope 1 is pre-stretched with a pre-stretching ratio of 105%-180%. By pre-tensioning the core rope 1, surface stress is removed, strength is increased, and fiber elongation is reduced, achieving the requirements of high strength and low elongation. During pre-stretching, the three strands are stretched simultaneously, which improves the processing efficiency of the strands and ensures that the stretching ratio and stretching effect of the multiple strands are the same, keeping the tension of each strand consistent. This ensures that the static rope is subjected to the same force during use, improving the performance and service life of the static rope.

[0032] S6. Multiple twisted threads of sheath 2 are wrapped around the rope core 1 and woven into sheath 2 using a 24-spindle, 32-spindle, or 48-spindle braiding machine;

[0033] S7. The rope core 1 and sheath 2 are dried and shaped by electric heating or infrared drying. The temperature of the electric heating or infrared drying is 100℃-150℃ and the processing time is 3min-20min.

[0034] The diameter of the high-strength, low-elongation static rope is 8.5-16mm, the diameter of the sheath 2 accounts for 25%-55%, the number of yarn ends of the rope core 1 is 10-70, and the number of yarn ends of the sheath 2 is 10-70.

[0035] According to standard EN1891-1998 "Personal protective equipment for the prevention of falls", the static rope in the embodiment was compared with the existing ordinary static rope for performance testing. Under the conditions of initial impact force of 5.1kN, 7 falls, and static strength of 30kN, the test results are shown in Table 1.

[0036] Table 1. Comparison of strength between ordinary static rope and static rope of the same diameter.

[0037]

[0038] The present invention has been described above by way of example, but the present invention is not limited to the specific embodiments described above. Any modifications or variations made based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A weaving method for producing high-strength, low-elongation static rope, characterized in that, include: S1. Combining and twisting multiple yarns to weave a twisted yarn into a rope core (1); S2. Combine and twist multiple yarns to weave a twisted yarn into a sheath (2); S3. The twisted strands of the rope core (1) are braided into a strand rope that serves as the rope core (1) by using an 8-spindle, 12-spindle or 16-spindle braiding machine; S4. Three strands of rope are arranged in parallel equilateral triangles to form a rope core (1); using the three rope cores, the tension of the rope cores is controlled by the equipment to keep the tension of the three rope cores consistent and form a stable equilateral triangle structure. S5. Pre-stretch the rope core (1); S6. The twisted threads of multiple sheaths (2) are wrapped around the rope core (1) and woven into sheaths (2) by a 24-spindle, 32-spindle or 48-spindle braiding machine. S7. The rope core (1) and sheath (2) are dried and shaped by electric heating or infrared drying.

2. The weaving method for producing a high-strength, low-elongation static rope according to claim 1, characterized in that, In step S5, the pre-stretching draw ratio is 105%-180%.

3. The weaving method for producing a high-strength, low-elongation static rope according to claim 1, characterized in that, In step S5, multiple strands of rope are stretched simultaneously.

4. The weaving method for producing a high-strength, low-elongation static rope according to claim 1, characterized in that, The processing temperature for electric heating or infrared drying is 100℃-150℃, and the processing time is 3min-20min.

5. The weaving method for producing a high-strength, low-elongation static rope according to claim 1, characterized in that, The high-strength, low-elongation static rope has a diameter of 8.5-16mm, the diameter of the sheath (2) accounts for 25%-55%, the number of yarn ends in the rope core (1) is 10-70, and the number of yarn ends in the sheath (2) is 10-70.

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