FI59627B - STAOLLINA MED FIBERELEMENT - Google Patents

Description

[USF ^ I ΓβΙ (11) HEARED * PUBLICATION CQgO? MA lJ '1 UTLÄCCNINGSSKAIPT J 7 ° *' C (45) Patent granted 10 09 1931 Patent meddelat '(51) Kv.ik.Wci.3 D 07 B 1/16 FINLAND —FINLAND (21) PttMttllMkmmn-p> t « mmeknln «Τ7θ61ιθ (22) Hikemtopllvl - AmMuiIngad ·· 01.03.77 (23) Home ·GIM | bMadag 01.03-77 (41) THlkit | . -

Patant · o «h raglataratyralaan A» ök * n utlagd och utl. * KrtfUn puMkartd 29-05.81 (32) (33) (31) Pyyöa * ty · β »οΜ« * ι »—Ivglrd prtorltat 02.03.76

Norway-Norway (NO) 76068U True-Styrkt (71) Elkem a / s, Middelthun6 gate 27, Oslo 3, Norway-Norway (NO) (72) Kjell Neslov, T ^ nsberg, Norway-NOge. (7 * 0 Oy Kolster Ab (5I +) Steel rope with fiber elements - St & llina med fiberelement

The invention relates to a steel rope with fiber elements. As is known in the art, steel ropes consist of a plurality of main strands helically wound around a core. All main strands and the core contain several steel wires, which are also helically wound in each main strand.

Similarly constructed ropes made entirely of fibrous material have also been used. Typical examples of such fibers are natural fibers such as sisal, manila, jute, hemp, cotton, etc. Synthetic fibers have also been used. Examples of these are propylene, nylon (usually nylon 6 or nylon 6,6), polyesters, polyvinyl chloride or other durable or disposable ingredients.

It has also been known to place synthetic fibers in steel ropes, often in the heart and, to a lesser extent, in the main strands. The main purpose of these fibers is to act as a carrier to prevent severe abrasion 2 59627 from steel strands close to the lubricant or to chemicals to reduce moisture, which would otherwise cause corrosion in the strands. The addition of fibrous material also improves the flexibility of the rope compared to ropes made entirely of steel wires. When the core is formed of a fibrous material, the fibers also improve the breaking strength of the rope. A common property of these fibers is a low modulus of elasticity and a correspondingly low breaking load when the fibers are subjected to high compressive loads laterally in the rope. These properties make such fibers completely unsuitable to act as axial load-bearing elements of a tensile-loaded steel rope. Em. for these reasons, the addition of these fibers generally reduces the tensile strength of the rope compared to a rope of the same thickness made entirely of steel wires.

Examples of publications in which known rope structures are described are CH Patent Publication 520,228, DE Application Publication 2,505,568 and DE Application Publication 2,455,273, the latter of which is published after the priority date of this invention.

According to the invention, a certain type of fibrous material is used in steel ropes, which achieves all the advantages obtained with conventional fibers and, in addition, the axial load-bearing capacity of the finished rope structure. The fibers with which these properties are achieved are made of so-called "HMO material" (High Modulus Organic). Examples of HMO fibers suitable for use in the invention include fibers made from aramids, aromatic polyamides, and fully aromatic polyesters. Aramids have been found to be particularly suitable.

Specifically, the invention is mainly characterized in that the fibrous elements are aromatic polyamide fibers or the like, which are known to be helically twisted per se, and which act in part as axial load-bearing elements.

The invention achieves the following advantages: a) Compared to conventional steel wire ropes, the same breaking strength is achieved with a substantially lower weight. Alternatively, significantly higher tensile strength is obtained without substantial weight gain. For example, the tensile strength can increase by 40-100% with an increase in total weight of only 3-5%.

3 59627 (b) Ropes with high tensile strength can be made considerably more flexible without having to increase the diameter of the rope, with the result that smaller winch drums can be used, thus saving considerable space.

c) The manufacture of steel wire ropes can be considerably simplified, as the structure according to the invention requires a smaller amount of wire to achieve the same load-bearing capacity compared to conventional structures with more yarns and conventional fibrous material.

d) A particularly great advantage is achieved in the form of anchor ropes for drilling rigs, ships, etc. because the breaking strength of the rope can be substantially improved without having to increase the weight of the rope.

e) The fibers are suitable for carrying lubricants and / or impregnating agents needed to prevent abrasion and corrosion.

f) The joining of aramid fibers to the steel structure results in higher compressive strength, as the higher compression of the steel itself resists the compression of the combined strand. As a result, the aramid fibers are subjected to lower fatigue stresses, making it possible to use lower rotational levels than in the case of aramid fibers alone. Accordingly, the compression of the fiber core by the steel strands can be used to improve the compressive strength of the rope.

g) Improved crushing resistance, eg resistance to strong local deformation, h) Good compressive performance of the aramid core in experiments. This phenomenon has been particularly astonishing because the information provided by the manufacturer does not promise good performance under compressive stress,