RU212331U1 - STEEL ROPE WITH ORGANO-METALLIC CORE - Google Patents

Abstract

The utility model relates to rope production and can be used on lifting equipment. The technical problem is to increase the service life of the rope by increasing wear resistance, resistance to transverse deformations, flexibility, corrosion resistance and tight laying of the rope. The problem is solved by the fact that a steel rope with an organometallic core, including six compressed outer strands with a strip contact of wires of the design 6×26(1+5+5/5+10), twisted around the organometallic core. A steel rope with an organometallic core consists of an organometallic core of the design 3×19(1+9+9)+3o.z. - 1, consisting of steel strands 2 with a linear touch (LK-O type) of wires in the outer layer of the same diameter 3 and an organic filler of the interstrand space 4, around which six outer strands 5 are wound along a helical line with plastic circular compression. The diameter of the organometallic core is D _mos =0.396⋅D _n.c. , where D _n.c. - the nominal diameter of the rope, the diameter of the organic filler of the inter-strand space is chosen equal to d _o.z. =(0.5÷0.6)⋅d _p.s. , where d _p.s. is the diameter of the steel strand of the core. Polypropylene fiber was used as an organic filler of the interstrand space. In this case, the outer strands of the rope are plastically deformed with a degree of compression of 4-6%.

Description

The utility model relates to rope production and can be used on lifting equipment.

Known steel rope double lay with an organic core design 6×31(1+6+6/6+12)+1 o.s. and with a metal core construction 6×31(1+6+6/6+12)+7×7(1+6). (GOST 16853-88 "Steel tackle ropes for operational and deep exploratory drilling. Specifications" Introduced - 07/01/89 M .: USSR State Committee for Standards).

The disadvantage of organic core rope is poor resistance to transverse deformations from high loads during the operation of the rope. The rope loses its round shape, unevenly fits into the winch drum streams, as a result of which premature wire breaks occur. The regulated tolerance of the actual rope diameter exceeds more than 5%, which does not satisfy the size of the winch drum grooves. The working life of the rope is reduced.

The disadvantage of a rope with a metal core is the design of the core 7 × 7 (1 + 6), which consists of seven strands of absolutely identical diameters, as a result of which a radial gap is formed between the central strand of the core and its outer strands and the density of the twist decreases, which leads to sinking individual strands in the places of their tangential contact, violation of the round shape of the cross section of the core. The straight central strand in the core experiences overload during the operation of the rope: stretching combined with torsion of the rope on the pulleys of the lifting equipment. This leads to breakage, outward exit of the central strand into the interstrand space of the rope, which entails a decrease in the safety of the lifting operations performed and a decrease in the technical life of the rope.

The closest analogue to the claimed device is a steel rope double lay construction 6×26(1+5+5/5+10)+3×19(1+6+6/6)+3 oz. with a linear touch of wires of different diameters in the outer layer of steel strands of an organometallic core (RF patent for invention No. 2731238, IPC D07B 1/00, E21B 19/00).

The disadvantage of this rope is the reduction of service life. This is due to the fact that the outer layer of steel strands of the organometallic core consists of alternating wires of two diameters - small (thin) and large diameter. With an increase in the load on the rope, the compression pressure between the rope and the pulley of the lifting equipment increases, which is transmitted from the outer strands of the rope to the core wires, friction and pressure between the rope and core strands, adjacent wires of thin and large diameters in the steel strands of the core, which provokes rapid destruction thin wire. In addition, thin-diameter wires corrode faster than larger-diameter wires. The worn and broken wires of the core inside the rope are hidden from visual inspection, the structural integrity of the organometallic core is violated.

In addition, the plastic compression of the strands of this rope is carried out with a compression ratio of 13-20%. It is known that when compression exceeds 8%, the strength is significantly lost and the flexibility of the rope strands is reduced.

The number of kinks and twists of deformable wires is reduced. (Abstract of the dissertation for the degree of candidate of technical sciences Lapteva T.A. "Improving the performance of movable ropes based on the use of calibrating compression of strands", Specialty 05.16.05 - Metal forming, 2014, p. 88)

The technical problem is to increase the service life of the rope by increasing wear resistance, resistance to transverse deformations, flexibility, corrosion resistance and tight laying of the rope.

The problem is solved by the fact that in a steel rope with an organometallic core, including six compressed outer strands with a strip contact of wires of the design 6×26(1+5+5/5+10), twisted around the organometallic core. The design of the organometallic core 3×19(1+9+9)+3 oz. made with a linear touch of wires of the same diameter in the outer layer of steel strands, while the diameter of the organometallic core is calculated D _mos \u003d _{0.396⋅D n.c.} , where D _n.c. - nominal diameter of the rope, 0.396 - coefficient that provides the optimal tangential clearance between the outer strands of the rope. This coefficient was obtained by calculation and experience. The diameter of the organic filler of the interstrand space is chosen equal to d _o.z. =(0.5÷0.6)⋅d _p.s. , where d _p.s. - diameter of the steel strand of the core, 0.5÷0.6 - design coefficient, which ensures complete filling of the space between the steel strands of the core and the structural integrity of the rope. Polypropylene fiber was used as an organic filler of the interstrand space. While the outer strands of the rope are plastically deformed with a degree of compression (n _l ) 4-6%, at other values of the degree of compression, the mechanical properties of the wire deteriorate, plasticity decreases. The test results are shown in table 1.

The essence of the claimed utility model is illustrated by drawings:

figure 1 schematically shows the appearance of the inventive steel rope with a metal-organic core,

figure 2 shows a section of the rope shown in figure 1;

figure 3 shows an organometallic core.

A steel rope with an organometallic core consists of an organometallic core of the design 3×19(1+9+9)+3 oz. - 1, consisting of steel strands 2 with a linear touch (LK-O type) of wires in the outer layer of the same diameter 3 and an organic filler of the interstrand space 4, around which six outer strands 5 are wound along a helical line with plastic circular compression.

The resistance of the rope to transverse deformations is achieved due to the combined organometallic core.

Organic filler protects the rope from dust, moisture, abrasive substances inside and creates the structural integrity of the rope, which increases flexibility and corrosion resistance.

As organic fillers, cores made of chemical or natural fibers can be used, for example, commercially available organic cores of a double lay of polypropylene material.

The diameter of the wires in the upper layer of the core strands is close to the diameter of the wires of the outer strands of the rope, which increases the wear resistance of the core and the rope as a whole.

The absence of a central strand in the core contributes to an even distribution of forces between the rope elements and eliminates excessive loading of the steel core strands.

For a tight lay of a rope, we calculate:

1. Diameter of the organometallic core

D _n.c. - nominal rope diameter

2. The diameter of the steel strand of the organometallic core

2.15 is the calculated coefficient of the geometric dependence of the diameter of a twisted core of three steel strands on the diameter of the steel strand, determined geometrically by calculation

3. Diameter of organic filler according to the formula:

4. Diameter of the crimped rope strand

3.06÷3.07 - calculated coefficient of geometric dependence of the rope diameter on the diameter of the outer strand with the corresponding lay pitch, determined geometrically by calculation.

At the Magnitogorsk hardware and calibration plant "MMK-METIZ" batches of ropes with a diameter of 28 and 38 mm were manufactured, in accordance with the above description.

The manufactured ropes were used for deep drilling at a drilling rig in the northern region of Russia at temperatures from +35°С to -45°С, at the enterprises of Rosneft Oil Company PJSC.

The declared parameters: the actual diameter of the rope, flexibility, resistance to transverse deformations, corrosion resistance, showed satisfactory manufacturability. The service life in comparison with the one regulated in GOST 16853-88 increased by 8-10%.

Thus, the claimed rope completely solves the problem.

Claims (3)

1. A steel rope with an organometallic core, including six compressed outer strands with a strip touch of wires of 6 × 26 (1 + 5 + 5/5 + 10) design, twisted around an organo-metallic core, characterized in that the design of an organo-metallic core is 3 × 19 (1 +9+9)+3o.z. made with a linear touch of wires of the same diameter in the outer layer of steel strands, while the diameter of the organometallic core is calculated D _mos =0.396⋅D _n.c. , where D _n.c. - the nominal diameter of the rope, the diameter of the organic filler of the inter-strand space is chosen equal to d _oz. =(0.5÷0.6)⋅d _p.s. , where d _p.s. is the diameter of the steel strand of the core. 2. The rope according to claim 1, characterized in that polypropylene fiber is used as an organic filler of the interstrand space. 3. Rope according to claim 1, characterized in that the outer strands of the rope are plastically deformed with a compression ratio of 4-6%.

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