KR100328719B1 - Wire rope having a multi-layered strand core - Google Patents

Abstract

The present invention relates to a wire rope having a multi-layered strand core having a unique structure consisting of a strand core, which is a 7 × 7 structure of a conventional wire rope, having 1 × 36 + 26 + 26, which is a three-layer structure of a central strand, a middle strand, and an outer layer strand. .

The wire rope having a multi-layered strand core of the present invention has a technical feature of forming a grease coating layer and a high density polyethylene coating layer between the center strand and the middle strand constituting the strand core, thereby providing flexibility of the strand core itself and The continuous and uniform grease supply of the strand shim to the outer layer strands with use improves the fatigue life of the wire rope.

The multi-layered strand strand core of the unusual structure constituting the wire rope of the present invention is the core strand, the middle strand and the outer layer strands are different in the wire diameter of the strands constituting each strand, but the same structure with 25 to 32 strands of the same number It is not a conventional structure in which strands composed of a plurality of strands gather around the center strand outer circumferential surface of the strand core, but a wire diameter of one strand, in which the strands are in contact with each other in a line and surrounds the center strand outer circumference, is the thickness of the strand layer. Another technical feature is that the intermediate strand of the one-layer structure surrounding the outer circumferential surface of the central strand in a hollow cylindrical shape, and the outer layer of the one-layer structure surrounding the intermediate strand in the same manner.

Therefore, compared to conventional wire ropes of the same rope diameter having the same outer layer strands, the wire diameter of the strand core forming a strand core is smaller and the number of wire strands increases by almost twice, which increases the flexibility of the strand core and improves the fatigue resistance, thereby extending the service life of the wire rope. There is an advantage.

Description

Wire rope having a multi-layered strand core}

The present invention relates to a wire rope having a strand core of a structure different from the prior art, and more particularly, to a two-layer strand structure of a conventional center strand + outer layer strand constituting the strand shim, and a three-layer strand structure of a center strand + middle strand + outer layer strand. And the grease was applied to the surface of the center strand, and the high density polyethylene coating layer was formed thereon, which not only increased the strength of the strand, but also greased the gap between the worn gaps even if the polyethylene coating layer was worn according to the use of the wire rope. The present invention relates to a wire rope having a unique strand seam which improves the durability of the wire rope by improving the lubricity and flexibility of the strand seam itself by exhaling.

In general, steel wire ropes formed by stranding a plurality of metal wires or strands made of metal wire twisted wire are widely used in industries such as machinery, construction, ships, aerial cables, etc. Looking at the structure of the wire rope having a strand core of Fig. 1 as follows.

As shown, a conventional wire rope consists of a two-layered structure in which a strand shim 1 and a plurality of outer layer strands 2 surrounding the strand are twisted, wherein each strand is formed of several strands around one core line. As the wires are stranded at a predetermined twist pitch, there are various types of specifications according to the conditions such as the direction and pitch of the twist and the number of strands to be mobilized and the number of twisted layers. The wire rope of the illustrated structure is also a structure in which the outer layer strands 2 are composed of a single layer or a plurality of layers.

The strand shim 1 of FIG. 1 has a 7 x 7 structure in which a small strand 3 composed of one central element wire 3A and six outer layer element wires 3B forms two layers, a center layer and an outer layer. The eight outer layer strands 2 have a four-layer structure composed of 36 element wires.

The 7 × 7 structure of the strand shim 1 is composed of the small strands 3A and 3B having similar wire diameters, and thus consists of strands of the same diameter, and thus has good abrasion resistance and severe abrasion conditions. It can be usefully used in the structure and the simple structure has the advantage that it is difficult to cause form breakage.

However, the 7 x 7 structure itself is used both for the same color and for the same color, but a sheave that rotates in the same color wire rope as in the case of a crane that must perform continuous rotational bending movement. Due to repeated reciprocating motions wound on a rotating body that is not large in diameter, such as sheaves or drums, the flexibility of the strands tends to be low and the resistance to fatigue is low because of insufficient flexibility.

As a result, the disconnection generated in the strand seam of the 7 × 7 structure causes the rope to lose its shape and shorten the life of the rope.

Therefore, an object of the present invention is to provide a wire rope having a strand structure of a new structure that can improve the wear resistance and cutting force required to improve in the structure of the conventional wire rope to extend the service life of the rope.

That is, in order to extend the service life of the same color wire rope that must withstand repeated rotational and bending movements for a long time, such as for cranes, the flexibility of the strand seam is improved, and the grease supply ability of the strand seam to the outer layer strands by the use of the wire rope is improved. It was developed for the purpose of providing a wire rope having a strand seam structure which can be improved.

1 is a perspective view of a wire rope having a strand core of a conventional 7 × 7 structure.

2 is a cross-sectional view of a wire rope having a strand core of a conventional 7 × 7 structure.

3 is a perspective view of a wire rope according to an embodiment of the present invention.

4 is a cross-sectional view of a wire rope according to an embodiment of the present invention.

((Explanation of symbols for main part of drawing))

1. Conventional strand shim 11. Strand shim according to the present invention

16. High density polyethylene coating layer

17.Grease Coating Layer 61.Hoist

64. Weight 66. Ball

The wire rope having a specific strand core of the present invention is composed of a core strand having three layers of strands, a middle strand and an outer strand structure, and forming a grease layer and a high density polyethylene coating layer between the center strand and the middle strand, and having a three-layered strand. The technical feature of the strand shim structure is to make the shim act like a single strand with good lubricity and flexibility.

The outermost strand of the wire rope is formed of the same strand as the strand of the strand core.

In addition, the intermediate strand of the strand core and the outer layer strand form a circular cross-sectional shape in which a plurality of strands constituting each strand have a layered structure, and a plurality of strands gathered in a circular shape surround the outer circumferential surface of the central strand and form a layered structure again. It is not a conventional form of forming a hollow cylindrical structure in which the individual wires surround the center strands in a row, the center strand is inserted into the hollow, and the outer layer strands also have a structure in which the individual wires surround the middle strands in a row.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The details of the object and technical constitution of the present invention and the effects thereof according to the present invention will be more clearly understood from the following detailed description when taken in conjunction with the accompanying drawings.

3 and 2 are a perspective view and a cross-sectional view of a wire rope having a specific strand core according to the present invention.

As shown, the strand shim 11 is composed of three layers, namely the center strand 12 and the middle strand 13 and the outer layer strand 14, the center strand 12 is the outer layer strand of the conventional wire rope ( As in 2), the four-layer structure is composed of five kinds of wires of different wire diameters. In particular, the wires arranged on the third floor have a structure in which two wires of different wire diameters are alternately arranged.

The wire diameters of the five kinds of element wires constituting the center strand 12 include a center element wire 12A, four layers of wire 12E, two layers of wire 12B, three layers of large wire 12D, and three layers of small wires. It is small in order of element wire 12C, and big element wire 12D of three layers and element wire 12B of two layers have a substantially similar wire diameter.

The center strand 12 of the strand core 11 is composed of one central element wire 12A, seven two-layer element wires 12B, three seven-layer small element wires 12C, and a large element wire. (12D), 14 four-layer element wires (12E), and 36 element wires in total, and then, grease is applied to the surface thereof, and is completed by forming a high-density polyethylene coating layer 16 on the grease layer 17. .

At this time, the thickness of the applied grease layer 17 is about 2.7% of the diameter of the central strand 12, and the thickness of the high density polyethylene coating layer 16 is about 8% of the diameter of the central strand 12.

On the surface of the high-density polyethylene coating layer 16 on the surface of the center strand 12 of the strand shim 11, 26 core wires 13A having a line diameter similar to the two-layer wire 12B of the center strand 12 are arranged in a line. The intermediate strand 13 is formed by enclosing the outer circumferential surface of the substrate.

Further, the outer layer strand 14 is surrounded by 26 element wires 14A, which are line diameters between the center element 12A and the four-layer element 12E of the center strand 12, in a line. By the construction, the strand shim 11 is completed.

Therefore, the middle 13 and outer layer 14 strands constituting the strand shim 11 of the present invention, unlike the outer layer strands 3 of the conventional strand shim 1, form one outer skin layer 12 and 14, respectively. As the structure, the strand core 11 itself acts like one strand, and by reducing the number of wires of the whole wires constituting the strands, the conventional core 49 to 88 cores (36 core layers + 26 intermediate layers + 26 outer layers) Increased to).

In the strand core 11, the number of element wires 13A and 14A constituting the middle 13 and the outer layer 14 strands is preferably 25 to 32, which is the element wire 13A. If the number of (14A) is less than 25, the flexibility decreases as the diameter increases, and the resistance to fatigue decreases when the number exceeds 32, but the flexibility increases, but the cutting load of the wire itself decreases due to the reduction of the diameter. This is because the ability to maintain the shape of the strand seam decreases because the wire breaker is preferentially disconnected from the outermost layer wires 15A.

Finally, the outer layer strands 15 are formed of eight strands identical to the center strands 12 of the strand cores 11 so as to be in contact with the outer circumferential surface of the strand cores 11.

The wire rope of this invention is manufactured.

The present invention manufactures 8 × WS (36) + IWSC {1 × WS (36) + 26 + 26} wire ropes so as to have a diameter of 20mm and 32mm, so that conventional 8 × WS (36) + IWRC (7 ×) of the same diameter are manufactured. 7) The structure of wire rope, cutting load, flexibility, and fatigue resistance were investigated. The results are shown in Table 1 and Table 2 below.

division Species Invention Fill rate (%) Strand shim 65 88 rope 58.3 69 Ratio of outermost strand diameter of strand core / outermost strand diameter of outer strand 1.17 1.12 Cutting Load (Ton) 32.6 36.9 Flexibility (mm) 450 500 Left / Right Vibration Accuracy (mm) 120 20 Number of users (times) 28000 36000

* Test rope diameter; 20 mm

division Species Invention Fill rate (%) Strand shim 65 88 rope 58.3 69 Ratio of outermost strand diameter of strand core / outermost strand diameter of outer strand 1.17 1.12 Cutting Load (Ton) 80.2 95.6 Flexibility (mm) 680 790 Left / Right Vibration Accuracy (mm) 150 25 Number of users (times) 24500 32600

* Test rope diameter; 32 mm

Among the test items, the flexibility test is fixed to one side of the wire rope, when the wire rope of length 51 corresponding to 50 times the rope nominal diameter is placed horizontally in the air as shown in Fig. 5, the amount of the tip of the rope sag downward It is to measure 52.

In the left and right vibration test, as shown in Fig. 6, the wire rope 62 is mounted on the hoist 61 so that the length of the rope is 50 cm (63). ), The left and right movements of the ball 66 mounted on the weight were measured when reciprocating up and down at a reciprocating speed of 10 m / min between the distances 65 of 5 m.

In the fatigue test conditions, the cable to be tested was reciprocated at a distance of 200 mm at 7 times / min with a load of 70 N. The reciprocating motion was performed using two 30 mm diameter drums and two 19 mm diameter ball bearings. Gave a change in flexion.

As can be seen in Table 1 and 2, the wire rope of the present invention can be seen that the fatigue resistance is improved by more than 25% by more than 10% improvement in cutting load and flexibility compared to the conventional one, and despite the increase in flexibility It can be seen that the movement of is reduced and stability is improved.

As described above, in the wire rope according to the present invention, the diameter of the strands forming the strand cores decreases compared to the conventional one, thereby increasing the flexibility, and the cutting load is increased by 10% because the number of the strands increases almost twice. There is an advantage that the wear resistance is improved by increasing over.

In addition, with the use of wire ropes, if the high density polyethylene coating layer between the core strand and the middle strand layer of the strand core starts to wear partially, the grease applied directly under the polyethylene coating layer is along the worn gap of the polyethylene coating layer along the middle and outer layers of the strand core. As it penetrates into the outer layer strand of the rope through the strand and maintains lubricity and rust resistance between the strands, it has the advantage of extending the service life of the rope by improving the fatigue resistance of the wire rope.

Claims (3)

The strand core is composed of a three-layer structure consisting of a central strand, a middle strand, and an outer layer strand, and the outer strand of the strand and the strand of the wire rope, that is, the outer layer strand of the rope surrounding the strand core, are made of the same strand and have a parallel continuous structure. Wire rope with multi-layer strand strands. The center strand outer circumferential surface of the strand core is coated with grease, and a high density polyethylene coating layer is formed on the grease coating layer, and the wires forming the strands are in contact with the outer circumferential surface of the high density polyethylene coating layer and are arranged in a row. A wire rope having a multilayer strand core, wherein a strand surrounds an outer circumferential surface of a high-density polyethylene coating layer and a middle layer outer circumferential surface surrounds the outer strand of the middle strand in a manner similar to the arrangement of the middle strands while contacting the outer circumferential surface of the middle strand. According to claim 1, the intermediate strand constituting the strand core and the outer layer strands 25 to 32 number of the strands constituting each strand, each strand is in a form of a circle in contact with each other in a line, that is, constitute each strand A wire having a multi-strand strand strand, characterized in that the diameter of the element wire is the same as the thickness of each strand layer, and the middle strand surrounds the center strand while contacting the outer circumferential surface of the high density polyethylene coating layer, and the strand encloses the outer circumferential surface of the middle strand. rope.