RU200899U1 - Multi-strand steel rope - Google Patents

Abstract

The utility model relates to rope production. The present device is intended for operation in the coal and mining industries: on mine hoisting installations as vertical hoist ropes for drum machines and machines with a friction pulley, balancing ropes, guide and rebound ropes; for cranes, for hoisting mechanisms. With the help of the utility model, a technical result is achieved, consisting in obtaining a rope with an increased service life, which has resistance to torsion around its axis, increased flexibility, high lifting capacity, maximum filling of the section with metal. To solve the problem and to achieve this technical result, a multi-strand steel rope is proposed, consisting of a central strand with a diameter of D1, around which there are three layers of strands, while the first layer consists of six strands with a diameter of D2, the second layer of the rope is made of twelve strands of two different diameters D3 and D4, alternating between itself, and the number of strands with a diameter D5 in the third layer is eighteen, while the direction of the lay of the first and second layers of the rope is opposite to the direction of the lay of the third layer, the number of wires in all strands of the rope is seven, the ratio of the diameters of the strands that make up the rope are: D2 / D1 = (0.85 ÷ 1 , 00); D3 / D1 = (0.85 ÷ 1.00); D4 / D1 = (0.60 ÷ 0.75); D5 / D1 = (0.70 ÷ 0.85). The declared device has several features: 1. strands of rope can be plastically deformed; 2. the second layer of rope with strands without plastic deformation or with strands plastically deformed can be covered with polymer; 3. it is possible to cover the third layer of the rope with a polymer, while there can be several versions of the rope: with rope strands without plastic deformation; with strands plastically deformed; and with a second polymer-coated rope layer. The utility model is illustrated by illustrations in which the same or similar elements have the same reference numerals. 1 - cross-section of a rope of construction 18 × 7 + 6 × 7/6 × 7 + 6 × 7 + 1 × 7. 2 - cross-section of a rope of construction 18 × 7 + 6 × 7/6 × 7 + 6 × 7 + 1 × 7 with plastically deformed strands. 3 is a cross-section of a rope of construction 18 × 7 + 6 × 7/6 × 7 + 6 × 7 + 1 × 7 with a polymer coated second layer. 4 is a cross-section of a rope of construction 18 × 7 + 6 × 7/6 × 7 + 6 × 7 + 1 × 7 with a polymer coating of the third layer. 5 - cross-section of a rope of construction 18 × 7 + 6 × 7/6 × 7 + 6 × 7 + 1 × 7 with the coating of the second and third layers with polymer.

Description

The utility model relates to rope production.

This device is intended for use in the coal and mining industries: on mine hoisting installations as vertical hoist ropes of drum machines and machines with a friction pulley, balancing ropes, guide and rebound ropes; for cranes, for lifting mechanisms.

Known single-layer six-strand double lay ropes according to GOST 2688, GOST 7668, GOST 14954, GOST 7669.

The disadvantages of standard ropes are insufficient flexibility, torsion during operation, premature failure due to a large number of wire breaks in the outer layer.

Known multi-strand steel rope, low-twisting, construction 11 × 7 (1 + 6) + 6 × 7 (1 + 6) using plastically compressed strands in the outer layer (PM RU 109113, В66С 1/00, 2011).

The disadvantage of this utility model is low strength at the smallest diameter, rope strands do not create linear contact in the layers, which leads to insufficient flexibility and significant wear due to their crossing, as well as high contact stresses.

The closest technical solution adopted for the prototype is a multi-strand steel rope, low-rotating, construction 12 × 7 (1 + 6) + 3 × 7 (1 + 6) / 3 × 7 (1 + 6) + 3 × 7 (1+ 6) using plastically compressed strands (PM RU 109112, В66С 1/00, 2011).

The disadvantage of this utility model is that the design of this rope has a high bending stiffness, and the design of the core does not provide reliable support for the outer strands of the rope, does not increase the filling of the rope section, and therefore no linear contacts are formed between the layers, which reduces the period rope service.

With the help of the utility model, a technical result is achieved, consisting in obtaining a rope with an increased service life, which has resistance to torsion around its axis, increased flexibility, high carrying capacity, maximum filling of the section with metal.

To solve the problem and achieve the specified technical result, a multi-strand steel rope is proposed, consisting of a central strand with a diameter of D1, around which there are three layers of strands, while the first layer consists of six strands with a diameter of D2, the second layer of the rope is made of twelve strands of two different diameters D3 and D4, alternating with each other, and the number of strands with a diameter of D5 in the third layer is eighteen, while the direction of the lay of the first and second layers of the rope is opposite to the direction of the lay of the third layer, the number of wires in all strands of the rope is seven, the ratio of the diameters that make up the rope of the strands is : D2 / D1 = (0.85 ÷ 1.00); D3 / D1 = (0.85 ÷ 1.00); D4 / D1 = (0.60 ÷ 0.75); D5 / D1 = (0.70 ÷ 0.85).

The claimed device has several features:

1.strands of rope can be plastically deformed;

2. the second layer of the rope with strands without plastic deformation or with strands plastically deformed can be coated with a polymer;

3. It is possible to cover the third layer of the rope with a polymer, while there can be several versions of the rope: with rope strands without plastic deformation; with strands plastically deformed; and with a second layer of polymer coated rope.

The utility model is illustrated by images in which the same or similar elements are provided with the same reference numbers.

FIG. 1 - cross-section of a rope of construction 18 × 7 + 6 × 7/6 × 7 + 6 × 7 + 1 × 7.

FIG. 2 - cross-section of a rope of construction 18 × 7 + 6 × 7/6 × 7 + 6 × 7 + 1 × 7 with plastically deformed strands.

FIG. 3 - cross-section of a rope of construction 18 × 7 + 6 × 7/6 × 7 + 6 × 7 + 1 × 7 with a polymer coating of the second layer.

FIG. 4 - cross-section of a rope of construction 18 × 7 + 6 × 7/6 × 7 + 6 × 7 + 1 × 7 with a polymer coating of the third layer.

FIG. 5 - cross-section of a rope of construction 18 × 7 + 6 × 7/6 × 7 + 6 × 7 + 1 × 7 with the coating of the second and third layers with polymer.

The production of this multi-strand steel rope 18 × 7 + 6 × 7/6 × 7 + 6 × 7 + 1 × 7 is carried out in several technological operations.

Strands of rope are made on spinning equipment. To do this, six wires are wound around the center wire. To obtain plastically deformed strands, a roller dragging stand is used, which is installed directly on the spinning equipment after the die holder, the strand coming out of the dies, twisting, enters the roller dragging stand. After passing the drawing stand, the strand acquires a smooth, regular and dense surface. In this case, the diameter of the strand decreases after deformation, depending on the degree of reduction.

After the manufacture of all strands of the rope, the process of manufacturing the first and second layers of the rope is carried out in one technological operation on the rope equipment. The production of the first and second layers of the rope is done by twisting strands around the central strand 1 with a diameter D1. Strands 2 of the first layer have the same diameter D2, over which strands 3 and 4 of the second layer are twisted, the diameters of the strands of the second layer are different and in the second layer, strands of larger D3 and smaller D4 diameters alternate (positions 3 and 4 in Figs. 1-5, respectively) ... In this case, the rope layers form a linear contact.

The next technological operation is the twisting of the third layer of the rope on the wire rope equipment. Eighteen strands 5 of diameter D5 are twisted around the second layer of the rope. In this case, the direction of the lay of the third layer is opposite to the direction of the lay of the second layer.

The coating of the rope layers with polymer 6 is performed on the extrusion line. Polyolefins or other high molecular weight compounds can be used as polymer 6.

This design of the rope as hoisting ropes improves their performance.

The opposite direction of layering of the layers provides a balance of internal torques and elastic forces relative to the rope axis.

The construction of the rope 18 × 7 + 6 × 7/6 × 7 + 6 × 7 + 1 × 7 with alternating strands of larger and smaller diameters provides mutual linear contact of the strands in the layers, which excludes crossing strands in separate layers and reduces contact stresses.

The ratio of the diameters of the strands that make up the rope are: D2 / D1 = (0.85 ÷ 1.00); D3 / D1 = (0.85 ÷ 1.00); D4 / D1 = (0.60 ÷ 0.75); D5 / D1 = (0.70 ÷ 0.85). These ratios are rational, allow you to evenly distribute the strands in the layers of the rope, and ensure the exact geometry of the rope.

The choice of the design of the strand (1 + 6) is aimed at reducing the surface wear of the wires and increasing the endurance of the rope when working in bending, so the designs of strands with a large number of wires are prematurely destroyed under the action of high contact and tensile stresses, bends.

Due to the presence of linear tangency, the multi-strand steel rope has good flexibility, stress distribution over the layers is uniform.

The flexibility of the rope has a beneficial effect on the condition of the rope in the process of multilayer winding of the rope onto the drum and when working with a small ratio of the block diameter to the rope diameter.

A large number of strands in the outer layer reduces the contact stresses at the points of contact with the grooves of the pulleys and drums during operation.

Multi-strand steel rope has a high density and increased strength due to filling the section with metal.

Multi-strand steel rope with plastically deformed strands has a higher carrying capacity due to the increased cross-sectional area of the metal cross-section, high resistance to compression and friction, abrasion. A smooth surface increases the resistance of the rope to contact stresses when it grips a pulley, block or drum during operation and less wear of traction elements.

Multi-strand steel rope with a polymer coating of the second layer has a stable geometry. The polymer coating fixes the position of the rope strands, prevents internal corrosion, and reduces internal wear of the rope elements during operation.

A multi-strand steel rope can also be coated with a polymer that can prevent direct contact between the rope and equipment nodes, which increases the service life. The polymer coating improves the appearance of the rope as well as increases its resistance to corrosion.

Multi-strand steel rope has positive results in work. The technical resource of a multi-strand steel rope is 2-3 times higher in comparison with standard ropes made in accordance with GOST.

Claims (5)

1. Multi-strand steel rope, consisting of a central strand with a diameter of D1, around which there are three layers of strands, the first layer consists of six strands with a diameter D2, the second layer of the rope is made of twelve strands of two different diameters D3 and D4, alternating with each other, and the number of strands with a diameter D5 in the third layer is eighteen, while the direction of the lay of the first and second layers of the rope is opposite to the direction of the lay of the third layer, the number of wires in all strands of the rope is seven, the ratio of the diameters of the strands that make up the rope are: D2 / D1 = (0, 85 ÷ 1.00); D3 / D1 = (0.85 ÷ 1.00); D4 / D1 = (0.60 ÷ 0.75); D5 / D1 = (0.70 ÷ 0.85). 2. Multi-strand steel rope according to claim 1, characterized in that the strands of the rope are plastically deformed. 3. Multi-strand steel rope according to claim 1 or 2, characterized in that the second layer of the rope is coated with polymer. 4. Multi-strand steel rope according to claim 1 or 2, characterized in that the third layer of the rope is coated with polymer. 5. Multi-strand steel rope according to claim 3, characterized in that the third layer of the rope is coated with polymer.

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