RU2660076C1 - Flexible tubular braid for parachute strops - Google Patents

Flexible tubular braid for parachute strops Download PDF

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Publication number
RU2660076C1
RU2660076C1 RU2017124490A RU2017124490A RU2660076C1 RU 2660076 C1 RU2660076 C1 RU 2660076C1 RU 2017124490 A RU2017124490 A RU 2017124490A RU 2017124490 A RU2017124490 A RU 2017124490A RU 2660076 C1 RU2660076 C1 RU 2660076C1
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Russia
Prior art keywords
cord
threads
braid
angle
stocking
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RU2017124490A
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Russian (ru)
Inventor
Софром Гусейнович Керимов
Михаил Анатольевич Уточкин
Евгений Федорович Харченко
Елена Дмитриевна Кормакова
Сергей Вениаминович Заикин
Александр Семенович Червяков
Анастасия Миркаримовна Дворцевая
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Закрытое акционерное общество "Центр высокопрочных материалов "Армированные композиты" (ЗАО ЦВМ "Армированные композиты")
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Priority to RU2017124490A priority Critical patent/RU2660076C1/en
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    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04CBRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
    • D04C1/00Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof
    • D04C1/06Braid or lace serving particular purposes
    • D04C1/12Cords, lines, or tows
    • DTEXTILES; PAPER
    • D07ROPES; CABLES OTHER THAN ELECTRIC
    • D07BROPES OR CABLES IN GENERAL
    • D07B1/00Constructional features of ropes or cables

Abstract

FIELD: natural and chemical threads and fibers.
SUBSTANCE: tubular braid for parachute strops is proposed, made in the form of a threadlike body of a tubular shape formed by a mutual intertwining at an angle of crossing from 80° up to 100° an even number of braid threads, multiple of 8, divided into two parts, in each one the braid threads are arranged along spirals of the right and left directions with a helix angle from 35° up to 55°. Braid threads are divided into two unequal parts in a 3:1 ratio. Cord is made of a single intertwining with the formation of convex cells on its surface, each one in an alternating order contains portions of three single threads of the braid of one of the directions, bounded by braid threads of the opposite direction, forming on the surface of the cord the elements of the pattern of the plain weave of three folded bundles of single threads turned with respect to the longitudinal axis of the cord by an angle equal to half the angle of crossing. Degree of tightness of the cord is in the range (58±3) %.
EFFECT: proposed tubular braid can be used in various branches of technology, mainly as parachute strops; in addition, it can be used as a tow rope to move vehicles and trailers, and also as a carrying cord for winches, antenna stretches, yachting ropes and traction-drive elements of manual block and tackle units.
1 cl, 2 dwg, 2 tbl

Description

The invention relates to the textile industry and for the production of braided cords without a core, which can be used in various branches of technology, mainly as parachute slings. In addition, they can be used as tow ropes for moving vehicles and trailers, as well as a cargo rope for winches, antenna extensions, yacht ropes and traction drive elements of manual hoists and hoists.
Known braided technical cords (ShTL 7-200, ShTK 1-8, ShTK 1-26, ShTK-1,7-16, ShTK 1,7-40 ShTK 2,5-55, ShTK 2,5-70 , ШКТКр-23, ШКТ-50, ШКТкр-50, ШКП-60, ШКПкр-55), made in the form of a tubular body formed by two-strand weaving at an intersection angle of 30 ° to 80 ° of an even number of chemical braid threads, a multiple of eight , and divided into two equal parts, in each of which the braid threads are arranged in spirals of the right and left directions with an angle of elevation of the helix from 50 ° to 75 °. The surface of the cord consists of elements of the weave pattern “twill 2/2”, rotated relative to the longitudinal axis of the cord by an angle equal to half the angle of crossing. The packing factor of packing cords, defined as the ratio of the actual technological density of weaving to the maximum possible, is in the range from 0.4 to 0.7. The filling of the cross-section of the picking cords with fibrous material, depending on the number of braid threads, ranges from 42.04 to 85.86%. The cross section of the cords is rectangular with rounded ends. In the normative and technical documentation, the linear dimensions of the cords are characterized by the width of their half-perimeter and thickness [GOST 2297-90 "Braided technical picking cords"].
Synthetic woven stockings for the electrical industry are also known (ШППБ-2/251, ШППБ-5/55, ШППБ-2/85), made in the form of a tubular threadlike body formed by two-strand weaving at a crossing angle from 30 ° to 80 ° an even number of polyester braid threads, a multiple of eight, divided into two equal parts, in each of which the braid threads are arranged in spirals of the right and left directions with an angle of elevation of the helix from 50 ° to 75 °. Convex rhomboid cells are formed on the surface of the cords, each of which in alternating order contains sections of two adjacent braids of one of the directions, limited by the threads of the opposite direction, forming elements of the weave pattern “mat 2/2” on the surface of the cord, rotated by an angle relative to the longitudinal axis of the cord equal to half the angle of crossing. The tightness factor of the cords ranges from 0.42 to 0.67. Filling the cross section of these cords with fibrous material, depending on the number of braid threads, ranges from 42.04 to 85.86%. The cross section of the cords is rectangular with rounded ends. In the normative and technical documentation, the linear dimensions of the cords are characterized by indicators of the width of their half-perimeter and thickness [RF Patent No. 2321693 according to cl. D04C 1/00, BI No. 10, 2008].
A common disadvantage of the above two groups of known woven cord cords is the low degree of filling of their cross section with fibrous material and the resulting low rigidity of the cord layer. As a result of this, their cross sections are not rounded, but flat, in the form of a rectangle with rounded ends. This is due to the fact that the spindle arrangement algorithms used in the development of the well-known stocking cords on braiding machines, depending on the number of threads in the braid layer of the stocking cords, technologically provide the formation of cords with a braid layer with a section filling from 42.04 to 85.86%. Here, there is an inversely proportional dependence of the filling on the number of braiding threads - the smaller the number of braiding threads in the stocking cord, the higher the filling and compactness of the cord formed from them.
To obtain a cord stocking with a rounded cross-sectional shape, its filling, depending on the number of threads in the braid, should be correspondingly higher and range from 50.6 to 90.22%. It is such a high filling that can provide a round stocking cord with a sufficiently high stiffness of the braid layer, which is a more optimal estimated indicator of operational and consumer properties. In addition, the utilization factor of the strength of the original braid in a stocking cord with a rounded cross-sectional shape is higher than in a stocking cord with a flat rectangular cross-section.
An object of the present invention is to develop a design of a round braided cord stocking with filling the braid layer with fibrous material depending on the number of braiding threads in the range from 50.6 to 90.22%.
This goal is achieved by the fact that the proposed braided cord-stocking for slings of parachutes is made in the form of a tubular filamentous body formed by mutual weaving at an intersection angle from 80 ° to 100 ° of an even number of braid threads, a multiple of eight, and divided into two parts, each of which the braiding threads are arranged in spirals of the right and left directions with an angle of elevation of the helix from 35 ° to 55 °. In this case, the braid threads are divided into two unequal parts in the proportion 3: 1 (12: 4, 18: 6, 24: 8, 30:10, 36:12). The linear density of the braid, containing three times less number of threads, three times more.
The cord-stocking is made by single-strand weaving with the formation of convex cells on its surface, each of which in an alternating order contains sections of three single braids of one direction, limited by braids of the opposite direction, forming on the surface of the cord elements of a plain weave pattern of triple bundles of single threads rotated relative to the longitudinal axis of the cord at an angle equal to half the angle of crossing. The linear dimensions of the proposed stocking cord without taking into account the crushing of the braiding threads are determined by the formulas:
D cp = 0.23873m o ; D W = d o (0.23873m o +2); D int = d o (0.23873m o -2);
where D cp is the average diameter of the cord sheath, mm; D W - outer diameter of the cord, mm; D VN - inner diameter of the cord, mm; m o - the number of braiding threads forming a braided cord; d o - the calculated diameter of a single braiding thread, mm
FIG. 1. The layout of the braid for parachute slings in the cross section of the proposed cord-stocking made on a cordless machine of class 16 is shown.
FIG. 2. The layout of the braid for parachute slings in the cross section of the proposed cord stocking, made on a cordless machine of class 24.
In FIG. 1 and FIG. 2 the following designations are accepted: O - single braid thread; do is the calculated diameter of a single braid; D W - the outer diameter of the cord; D vn is the inner diameter of the cord.
In Tab. 1 shows the comparative values of the fillings of the analog cords and the proposed stocking cord for parachute slings depending on the spindle placement algorithms and the number of braid threads in the cord.
Figure 00000001
Figure 00000002
The manufacture of braided stocking cords for parachute slings provides for the preliminary winding of the braiding threads on braided spools, their installation on the axis of braided spindles, previously placed in the nests of the winged gears of the braided machine according to a predetermined algorithm, and the inclusion of the braided machine in operation.
In this case, the spindles are placed in the nests of the winged gears according to the 3/1 (1/3) algorithm, i.e. - in one direction of the winged gears, three nests in a row are occupied, and one nest is free, and in the opposite direction of the winged gears one nest is occupied, and three nests in a row are free.
To confirm the technical result of the invention, experimental samples of cords-stockings for parachute slings of the proposed design were made. The main technical characteristics of the cords-stockings of the proposed structures are given in Table. 2. Sections of the proposed cords have a clear rounded shape, the linear size of which can be identified as a diameter.
Figure 00000003

Claims (3)

  1. A braided cord-stocking for parachute slings made in the form of a tubular threadlike body formed by interlacing at an intersection angle from 80 ° to 100 ° of an even number of braid threads, a multiple of 8, and divided into two parts, in each of which braid threads are located spirals of the right and left directions with a helix angle of 35 ° to 55 °, characterized in that the braid threads are divided into two unequal parts in a 3: 1 ratio, and the linear densities of the braid threads containing three times less number of threads are three times more than in the second part, in which there is a threefold quantitative predominance of braid threads, the cord being made by single-strand weaving, with the formation of convex cells on its surface, each of which in alternating order contains sections of three single braid threads of one of the directions, limited by braids of the opposite direction, forming on the surface of the cord, the elements of a plain weave pattern of three-fold bundles of single threads rotated relative to the longitudinal axis of the cord by an angle equal to half the angle crossing, the degree of compaction of the apex of the stocking is in the range of (58 ± 3)%, and the linear dimensions of the apex stocking exclude buckling braid filaments are defined by the formulas:
  2. Figure 00000004
  3. where D cp is the average diameter of the cord sheath, mm; D W - outer diameter of the cord, mm; D VN - inner diameter of the cord, mm;
    Figure 00000005
    - the number of braid threads forming a braided cord; d about - the estimated diameter of a single braiding thread, mm
RU2017124490A 2017-07-10 2017-07-10 Flexible tubular braid for parachute strops RU2660076C1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4123894A (en) * 1977-08-05 1978-11-07 Bethlehem Steel Corporation Sealed wire rope
US6136391A (en) * 1998-03-16 2000-10-24 Santa's Best Reverse twist multi-strand garland and method of making same
JP2007119961A (en) * 2005-10-28 2007-05-17 Tesac Wirerope Co Ltd Wire rope and method for producing the same
RU2321693C2 (en) * 2005-11-21 2008-04-10 Софром Гусейнович Керимов Interlaced cord for electro-technical industry
RU2401894C1 (en) * 2009-09-03 2010-10-20 Софром Гусейнович Керимов Braided safety-rescue cord

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4123894A (en) * 1977-08-05 1978-11-07 Bethlehem Steel Corporation Sealed wire rope
US6136391A (en) * 1998-03-16 2000-10-24 Santa's Best Reverse twist multi-strand garland and method of making same
JP2007119961A (en) * 2005-10-28 2007-05-17 Tesac Wirerope Co Ltd Wire rope and method for producing the same
RU2321693C2 (en) * 2005-11-21 2008-04-10 Софром Гусейнович Керимов Interlaced cord for electro-technical industry
RU2401894C1 (en) * 2009-09-03 2010-10-20 Софром Гусейнович Керимов Braided safety-rescue cord

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