JP6424296B2 - Elevator wire rope - Google Patents

Description

The present invention relates to a wire rope for an elevator of a super high-rise building, and the grease content in at least one steel core among the steel cores of the wire rope in which a number of steel core strands are interposed between a core strand and an outer layer strand. The present invention relates to an elevator wire rope that includes a high fiber core so that stable oiling is continuously performed while maintaining high elasticity and low elongation characteristics.

In general, metal wire ropes are widely used in a wide range of fields such as machinery, construction, ships, fishing, mining, bridges, aerial cables and other elevators. The description is based on FIG. 1 as follows.

As shown in the drawing, a general wire rope R has a structure in which a large number of outer layer strands 2 are twisted outside a core or center 1 located inside. At this time, each outer strand 2 has a structure in which a large number of unit strands 2b are twisted at a predetermined pitch around a single core 2a, and the direction and pitch of the twist, the number of strands to be mobilized and the twist It is distinguished according to the standard display according to conditions such as the number of layers.

The wire rope R having the illustrated structure has a structure in which the outer layer strand 2 is composed of a single layer, but a structure in which the outer layer strand is composed of a plurality of layers is common.

On the other hand, in the case of a wire rope, tension due to load acts in the longitudinal direction of the rope, or in the process of contact movement with the sheave, the load with contact friction between strands and between the strands constituting each strand. The fatigue life decreases due to repeated action, and the fatigue life decreases as the rust-preventing plating layer is damaged and rust is generated. To prevent this, apply a lubricant such as grease. Yes.

In such a wire rope, the grease included in the rope core constituting the center of the wire rope is supplied to the outer strand, and the material of the heart rope is Sisal or the like. There are two main types: fiber cores and steel cores.

In the case of a wire rope using the fiber material core rope, grease can be relatively much contained, so that there is an advantage that the grease content is high and the rope itself has high flexibility, but the cutting load is high. Low, high elongation and low mechanical properties.

On the other hand, the steel core is an IWRC (Independent Wire) in which the core rope is located at the center of the wire rope.
CFRC (Center Fit Rope) where the Rope Core and IWRC strand are located in the inner valley of the outer layer strand
Two types of steel cores are typical, and such steel cores have a relatively low grease content compared to the fiber core, but the entire rope is made of steel. High elongation, low elongation, low rope shape deformation, excellent mechanical properties, high tension applied, especially in the case of CFRC, metal cross section is wide, high-rise elevator wire Often used for ropes.

In Korean Patent No. 10-109578, there is a coating film in which six outer layer strands are stranded on the outside of the IWRC core and a hole for passing grease is formed on the outer periphery of the IWRC core. A structure is disclosed in which the grease is continuously supplied from the heart rope side to the outer strand side through holes formed in the coating film during use of the wire rope.

On the other hand, recently, as the number of high-rise buildings increases, the demand for wire ropes for elevators used in high-rise buildings is also increasing. Compared to conventional wire ropes, wire ropes used in such high-rise elevators are more secure than conventional wire ropes in order to ensure safety according to long driving distances compared to wire ropes used in conventional middle-rise and high-rise building elevators. In order to maintain a high level of safety, elastic modulus, and low elongation while operating long distances at high speeds, quality characteristics are required that minimize the generation of vibrations to maintain a feeling of riding when getting on and off. .

Korean Patent No. 10-1091578

The present invention is for solving the problems of the above-mentioned conventional elevator wire ropes for high-rise buildings, and adopts a CFRC steel core structure, while maintaining high elasticity and low elongation characteristics, It is an object of the present invention to provide an elevator wire rope capable of appropriately changing the grease content in consideration of use conditions.

In general, elevators in high-rise buildings have a high operating speed, so those with low grease content are advantageous in terms of preventing grease scattering, but if the grease content is relatively low, the service life of the wire rope is affected. May require regular inspection, repair and re-oiling.

Accordingly, the present invention provides a wire rope having a CFRC steel core structure having a high elasticity and a low elongation characteristic. In this case, by applying a fiber core in which grease is immersed in the center of the CFRC steel core, By having a higher internal grease content compared to the CFRC steel core of this type, when the rope is used, a gradual grease outflow occurs through the inside of the rope, preventing premature grease consumption and fatigue. There are technical features that maintain quality and eliminate the need for re-oiling.

In the present invention, 10 outer layer strands consisting of 26 strands are basically twisted around a central strand consisting of 36 strands, and 7 strands are interposed between the central strand and the outer strand. Based on the following structure with 10 CFRC steel cores.

Rope structure: 10 × 26 (outer layer strand) + [1 × 36 (center strand) + 10 × 7 (steel core)]

The structure is illustrated in FIG. As shown in the drawing, 10 outer layer strands 20 made of 26 strands are stranded outside the center strand 10 made of 36 strands, and the space between the center strand 10 and the outer layer strand 20 is twisted. It has a structure in which ten steel cores 30 made of seven strands are located.

In the present invention, the object of the present invention is achieved through a structure in which the central strand of one or more steel cores is made of synthetic fibers in the wire rope of the CFRC structure.

Polypropylene (PP) is preferable for the synthetic fiber that forms the core wire of the steel core, and such a synthetic fiber material core wire (fiber core) is at least one of 10 steel core strands depending on use conditions. When applied to one, in some cases, the fiber core of the synthetic fiber (PP) material may be used for all ten steel core strands.

The grease content of the wire rope according to the present invention is in the range of 1.2 to 2.0%.

The wire rope for elevators according to the present invention has an advantage that the content of grease can be increased while maintaining high elasticity and low elongation as mechanical characteristics of the rope of the CFRC core rope structure.

And since the wire rope of the present invention can easily adjust the target grease content only by the change to the number of oiled fiber cores (PP) inserted in the center of the heart rope (RC), There is an advantage that the grease content management and adjustment work is simple.

In addition to this, the wire rope of the present invention has a fiber core (PP) containing grease at the innermost central portion of the rope, so that a gradual outflow occurs. This is effective in suppressing the scattering of the air quality, and meets the quality characteristics required for elevator wire ropes for high-rise buildings.

It is a front view which shows the structure of a general wire rope. It is sectional drawing with respect to the wire rope of a 10x26 + [10x7 + 1x36] structure. It is sectional drawing with respect to the wire rope of a 10x26 + [(8x7 + 2x (6 + F) + 1x36] structure based on this invention. It is sectional drawing with respect to the wire rope of a 10 * 26 + [(6 * 7 + 4 * (6 + F) + 1 * 36] structure concerning this invention. It is sectional drawing with respect to the wire rope of a 10 * 26 + [(4 * 7 + 6 * (6 + F) + 1 * 36] structure concerning this invention. It is sectional drawing with respect to the wire rope of a 10 * 26 + [(2 * 7 + 8 * (6 + F) + 1 * 36] structure concerning this invention. It is sectional drawing with respect to the wire rope of a 10 * 26 + [10 * (6 + F) + 1 * 36] structure concerning this invention.

The present invention is a CFRC wire rope having a structure of 10 × 26 + [1 × 36 + 10 × 7], and the central strand of at least one steel core is made of a synthetic fiber material or a natural fiber core. At this time, polypropylene (PP), polyethylene (PE), nylon (NYLON), etc. can be used for the synthetic fiber constituting the central strand of the steel core, and Sisal is used for the natural fiber core. it can. Of the synthetic fiber materials, polypropylene (PP) is most preferable. The structure of the wire rope of the present invention is as follows.

Wire rope of the present invention: 10 × 26 + [{(10−N) × 7 + N × (6 + F)} + 1 × 36]

F is the fiber core, N = 1 to 10

In the production of the wire rope of the present invention, after the fiber core (F) is coated with oil, the strand is twisted around the coated fiber core to produce a steel core strand. Is made of a normal wire rope manufacturing process in which the outer layer strand is twisted on the outer side after the wire is twisted around the center strand.

At this time, the steel core including the fiber core (F) can be changed between 1 and 10 as necessary.

3 to 7 are cross-sectional views of an elevator wire rope having a structure according to an embodiment of the present invention in which a steel core including an oiled fiber core is interposed between a central strand and an outer layer strand. FIG. 3 shows a case where fiber cores are included in two steel cores, and FIGS. 4 to 7 show wire ropes composed of steel cores each including 4, 6, 8, and 10 fiber cores. It is.

The grease content of the wire rope having the structure according to the embodiment of the present invention shown in FIGS. 3 to 7 and the wire rope having the conventional structure shown in FIG. 1 was measured. The results are as follows.

Grease content according to the number of fiber cores in the steel core In Table 1 above, in the embodiment of the present invention, the grease content of one fiber core inserted in the center of the steel core was about 40%. As shown in Table 1 above, it can be seen that the rope according to the embodiment of the present invention shows an increased grease content as compared with the wire rope of the conventional CFRC structure in which the fiber core is not included in the steel core.

In the rope according to the embodiment of the present invention, it can be seen that the grease content increases almost proportionally as the number of fiber cores in the steel core increases, and thus the grease of the wire rope itself through the adjustment of the number of fiber cores. Adjustment to the content can be facilitated.

Claims (3)

Ten outer layer strands consisting of 26 strands are stranded around the center strand consisting of 36 strands, and 10 steel cores consisting of 7 strands are interposed between these central strands and outer layer strands. In the wire rope having a 10 × 26 + [1 × 36 + 10 × 7] structure, 10 × 26 + [{(10−N) including a fiber core (F) at the center of at least one of the steel cores. ) × 7 + N × (6 + F)} + 1 × 36] (N = 1 to an integer of 1 to 10) structure. The wire rope for an elevator according to claim 1, wherein the fiber core (F) is polypropylene (PP). The elevator wire rope according to claim 1, wherein the grease content of the wire rope is in the range of 1.2 to 2.0%.

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