JP2002275773A - Wire rope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire rope which is flexible and light, has a small rope diameter, can maintain a necessary strength, can keep needed fatigue resistance despite of the small rope diameter, can realize a good frictional contact with a sheave, and enables the space saving and cost reduction of the system. SOLUTION: This wire rope using highly strong steel element wires having a relation: 15 <= rope diameter (DR)/element wire diameter (WR)<=100 between (WR) and (DR), before the rope is wholly covered, has a core schenkel 7, arranging and twisting a plurality of side schenkels 8 each having a relatively smaller outer diameter than the outer diameter of the core schenkel 7 around a core schenkel 7a, and further having a polymer coating 10 for covering all the side schenkels 8. The core schenkel 7 is prepared by arranging and twisting a plurality of side strands 7b around a core strand 7a formed by twisting element wires and then applying a polymer cover 9 on the outer periphery of the twisted product. Each side schenkel 8 is prepared by arranging and twisting a plurality of side strands 8b around a core strand 8a prepared by twisting element wires.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire rope suitable for use in elevators and cargo handling such as cranes.

[0002]

2. Description of the Related Art An elevator is generally a system for moving a car connected to a rope up and down by using a frictional force between a rope and a sheave, and an elevator car and a counterweight are connected via a sheave. As a main rope for lifting and driving, a conventional elevator rope is generally a 6 × S (1
9), 8 × S (19), 6 × W (19), 8 × W (1
9), 6 × Fi (25), 8 × Fi (25), and a wire rope having a diameter of about 12 mm and a breaking load of 64.4 kN was used. Also, regarding the material of the wire constituting the rope, low carbon steel has been used to prevent wear of the sheave in consideration of the fact that the sheave is expensive and requires a great deal of labor and time for replacement.

[0003]

However, the conventional rope for an elevator has a large wire diameter of the rope, so that the rope shown in FIG.
As shown in (b), the diameter SD of the sheave 400 is as large as about 500 mm, and in connection with this, the driving machinery such as a motor is also upsized. For this reason, it was not possible to reduce the size of the machine room installed on the roof, and in particular, when the building became high-rise, it was inevitable that the equipment would become larger due to the increase in the weight of the rope.

Further, in a conventional elevator rope,
The intentional use of low carbon steel to prevent sheave wear and reduced hardness has limited the strength of the ropes, which has also been a problem for high rise buildings.

[0005] Further, conventional elevator ropes require oiling to generate rust and improve fatigue properties. As a result, the coefficient of friction is reduced, and slippage is likely to occur between the sheave and the rope. Due to this slip, the rotational movement of the sheave due to the rotation of the motor is not accurately transmitted to the rope, so that the rotational movement of the sheave and the vertical movement of the car are not linked, and accurate position control of the car cannot be performed. Therefore, conventionally, the sheave 400
The groove 401 has a special process of forming an undercut 402, and the rope is wound by a double wrap method, so that the equipment cost is high, and the rope mounting and replacement work is very difficult. There was a problem that it took time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. It is an object of the present invention to maintain the required strength while reducing the weight and flexibility of a rope, and to reduce the sheave diameter. It is an object of the present invention to provide a wire rope that can realize good frictional contact with a sheave while maintaining necessary fatigue properties even if the size is reduced, and that can save space and cost of the system.

[0007]

In order to achieve the above object, the present invention provides a high-strength wire having a wire diameter (WR) of 15 ≦ DR / WR ≦ 100 in relation to a rope diameter (DR) before the entire coating. A single wire Schenkel in which a plurality of side strands are arranged around a core strand formed by twisting the strands into a wire rope using a steel strand and twisted and the outer periphery is coated with a polymer compound A plurality of side strands are arranged around a core strand obtained by twisting strands, and a plurality of side strands having a smaller outer diameter than the polymer compound coated core strand are arranged. The entirety including the side Schenkel is coated with a polymer compound.

Further, the present invention is characterized in that the core Schenkel and the side Schenkel have the same specifications except that the twisting directions are opposite. Further, the core Schenkel and the side Schenkel are each configured such that the outer diameter of the core strand is larger than the outer diameter of the side strand, and in the core Schenkel, the twist direction of the core strand and the twist direction of the side strand are different. Schenkel is characterized in that the twist direction of the core strand and the twist direction of the side strand are different, and the twist direction is opposite to that of the core Schenkel. INDUSTRIAL APPLICABILITY The wire rope of the present invention is suitable for an elevator for transmitting power, for example, a main rope for lifting and driving, a governor rope for abnormal speed detection, and the like, since a good friction coefficient with a sheave can be obtained. In addition, it is applied to not only elevators but also cargo handling equipment represented by cranes and moving ropes of machines.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 schematically shows a traction type elevator to which a wire rope according to the present invention is applied, wherein 1 is a wire rope according to the present invention, 2 is a car fixed to a terminal of the wire rope 1, and 3 is a wire rope. A counterweight fixed to another terminal, 4 is a drive sheave for controlling the movement of the wire rope 1, and 5 is a drive sheave 4.
And 6 is a guide sheave for deflecting.

FIGS. 2 and 3 are enlarged views of an example of the wire rope 1. As a whole, a 7 × (7 × 19) structure, specifically, [｛(1 + 6) +12｝ + 6 × ｛(1+
6) +12}] + 6 × [{(1 + 6) +12} + 6 ×
{(1 + 6) +12}]. The wire rope 1 has a central core Schenkel 7 and a plurality of (six in the drawing) side Schenkels 8 surrounding the core. The core Schenkel 7 is coated with a polymer compound coating 9 and has a side Schenkel 8. The polymer compound coating 10 is entirely applied to the outside including the space, and has a circular cross section.

As shown in FIG. 3, a plurality of the core schenkels 7 are provided around a central core strand 7a.
The strand (7b) is arranged and twisted, and in this state, the polymer compound coating 9 is entirely applied. Each side Schenkel 8 is similarly configured by arranging and twisting a plurality of (six in the drawing) side strands 8b around a core strand 8a, and is not coated with a polymer compound.

The structure of each part will be described in detail. The core strand 7a and the side strand 7b of the core Schenkel 7 and the core strand 8a and the side strand 8b of the side Schenkel 8 each have a required number, for example, 19 steel wires in this example. Are twisted. The diameter (WR) of the steel wire is in the range of 15 ≦ DR / WR ≦ 100 in relation to the rope diameter (DR) before applying the polymer compound coating 10. This is because when 15 <DR / WR, the fatigue limit is reached relatively early due to repeated bending with the sheave, causing a problem in safety and a short life.
If> 100, the cost increases. More preferably, 33 ≦ DR / WR ≦ 75.

[0013] The steel wire preferably has a characteristic of a tensile strength of 280 kg / mm ² or more. This is to achieve a sufficient breaking load even by reducing the diameter.
If it is less than 80 kg / mm ^2, it is difficult to achieve this purpose. Such a steel wire generally has a carbon content of 0.80.
It is made by drawing a carbon steel wire rod of not less than wt%. The surface of the steel wire has a thin corrosion-resistant coating layer, for example, one of zinc, zinc-aluminum alloy plating, and brass plating.

The core strand 7a of the core Schenkel 7 is composed of a central core wire 700 and a number of side wires 701 and 702 having a relatively smaller diameter. In order to obtain such a configuration, the core strand 700 and the side strands 701 and 702 may be twisted together. However, preferably, in order to prevent rotation, a two-step twist is used.

FIGS. 4 (a) and 4 (b) show a manufacturing process of the core strand 7a of the core Schenkel 7, and as shown in FIG. In the first step of arranging a plurality of (six in the drawing) side strands 701 having a small diameter and twisting them at a predetermined twist pitch, 1+
Then, an inner layer 70a made of n is formed, and as shown in FIG.
A plurality (12 in the drawing) of side strands 702 are provided on the outer circumference
And the outer layer 70a 'is formed by a second step of twisting at a predetermined twist pitch. In this case, the twist direction in the first step and the twist direction in the second step are the same (for example, the Z direction). In FIG. 7, the symbols in the cross section of the strand indicate the twist direction. The side wires 701 of the inner layer 70a and the side wires 702 of the outer layer 70a 'may have the same diameter.

FIGS. 5 (a) and 5 (b) show a manufacturing process of each side strand 7b of the core Schenkel 7. Similarly, a plurality of core strands 703 having a smaller diameter than a single core strand 703 are shown. A first step of arranging six (six in the drawing) side strands 704 and twisting them at a predetermined twist pitch produces an inner layer 70b made of 1 + n, and a plurality m (see FIG. The second step of arranging (12) side strands 705 and twisting them at a predetermined twist pitch # (1 + n)
+ M}. In this case, the twisting direction in the first step and the twisting direction in the second step are the same direction, but are opposite (for example, S direction) in relation to the core strand 7a. Twist pitch is core strand 7a and side strand 7b
And the same.

The diameter of the core strand 703 of the side strand 7b is
Preferably, the diameter is relatively smaller than the diameter of the core strand 701 of the core strand 7a, for example, equal to the side strands 701, 702 of the core strand 7a. The diameter of the side strands 704 and 705 of the side strand 7b is the same as that of the side strand 7 of the core strand 7a.
01, 702, thereby making the diameter d1 of the core strand 7a appropriately larger than the diameter d2 of the side strand 7b. In addition, "strand diameter"
Means the circumscribed circle of the strand group of the outer layer constituting the strand.

As described above, the diameter d1 of the core strand 7a
Is larger than the diameter d2 of the side strand 7b.
This is to form a gap that allows resin to penetrate between the strands 7b when the core schenkel is made, and (d1−d2) / d2 × 100 is usually about 1.4 to
It is about 6.8%.

A plurality of (six in the drawing) side strands 7 are provided around one core strand 7a obtained as described above.
Distribute b and twist. In this case, the twist pitch is generally about 6 to 9 times the finished Schenkel diameter, and the twist direction is the same as the twist direction of the core strand 7a. This is because the manufacturing is easy and the shape is less likely to change due to the variation in the process. Thus, the elementary core schunkel 7 'as shown in FIG. Then, according to the present invention, this elementary schunkel 7 'is coated with a polymer compound to form a polymer compound coating 9 as shown in FIG. 6B. This polymer compound has properties such as good adhesion to steel, abrasion resistance, oil resistance,
It preferably has water resistance, temperature characteristics, weather resistance, and flexibility (stress crack resistance), and typical polymer compounds include general-purpose synthetic resins such as polyethylene, polypropylene, and fluorine resin. In addition, engineering plastics may be used. Alternatively, rubbers such as diene, olefin, and urethane may be used.

The method of forming the polymer compound coating 9 is arbitrary, and the core schunkel 7 ′ may be continuously passed through the melt, or may be extruded around the core schunkel 7 ′ by an extruder. Is also good. The polymer coating 9 prevents fretting of the core Schunkel 7 'and the side Schenkel 8 and is sufficient to fill the polymer between the side Schenkels when the final polymer compound coating 10 is formed. The coating thickness t is set so that a sufficient space can be secured. At this time, the space between the side schenkels is preferably about 0.3 to 1.5 mm. The polymer compound reaches the surface of the core strand 7a through the gap between the side strands 7b, 7b, thereby forming a film having a buffering performance. Part 90 of the high molecular compound is the side strand 7
It may penetrate between the strands of b, and may also penetrate between the strands of the core strand 7a.

Next, the core strand 8a of the side Schenkel 8
The core strand 8a of the side Schenkel 8 is composed of a central core wire 800 and a number of side wires 801 and 802 having a relatively smaller diameter. The diameter may be the same as that of the core Schunkel 7. FIGS. 7A and 7B show such a core strand 8a.
In the same manner as in the case of the core schunkel 7, a plurality of (six in the drawing) side strands 801 having a relatively smaller diameter are arranged around one core strand 800. 1 + n by the first process of arranging and twisting at a predetermined twist pitch
Is formed, and a plurality of m (12 in the drawing) side strands 80 to be an outer layer are formed around the inner layer 80a.
2 and a second step {(1 + n) + m} of twisting at a predetermined twist pitch. In this case, the twisting direction of the first step and the twisting direction of the second step are the same, but are opposite to the direction of the core strand 7a of the core schunkel 7 (for example, the S direction).

FIGS. 8 (a) and 8 (b) show a manufacturing process of the side strand 8b of the side Schenkel 8, and similarly, a plurality of wires having a relatively smaller diameter around one core strand 803. In the first step of arranging (six in the drawing) side strands 804 and twisting them at a predetermined twist pitch, an inner layer 80b made of 1 + n is formed, and a plurality m of outer layers (in the drawing, to be an outer layer) are formed around the inner layer 80b. Second step of arranging (12) side strands 805 and twisting them at a predetermined twist pitch {(1 + n) +
m｝. In this case, the twisting direction in the first step and the twisting direction in the second step are the same direction, but are opposite (for example, the Z direction) in relation to the core strand 8a. Twist pitch is core strand 8a and side strand 8b
And the same.

The diameter of the core strand 803 of the side strand 8b is appropriately smaller than the diameter of the core strand 800 of the core strand 8a, and the diameter of the side strands 804 and 805 of the side strand 8b is the same and the side strand of the core strand 8a is equal. Thus, the diameter d3 of the core strand 8a is appropriately larger than the diameter d4 of the side strand 8b. Basically, the diameter relationship of the wires may be the same as the core strand 7a and the side strand 7b of the core schunkel 7.

A plurality of (six in the drawing) side strands 8b are arranged around one core strand 8a and twisted. In this case, the twist pitch is generally about 6 to 9 times the finished Schenkel diameter, and the twist direction is the same as the twist direction of the core strand 7a (for example, the S direction). This is because the manufacturing is easy and the shape is less likely to change due to the variation in the process. Thus, the side schunkel 8 as shown in FIG.
Is made. The outer diameter of the side Schenkel 8 may be substantially the same as that of the core Schenkel 7, but since the polymer compound coating 9 is not provided, the outer diameter is reduced accordingly.

Next, a plurality of side schunkels 8 are arranged around the core schenkel 7 having the polymer compound coating 9, and these are twisted to obtain a rope of the present invention. The twist pitch of this final twist is appropriately selected according to the twist structure and the wire diameter,
Usually, it is performed so that the diameter is about 6 to 9 times the diameter of the finished rope, and the twist direction matches the twist direction of the core Schenkel 7. For example, in this example, the direction is the Z direction. Thus, FIG.
Is completed.

The rope 1 ′ is finally entirely coated with a high molecular compound to form an entire coating layer 10. The entire coating layer 10 is for preventing fretting between the side schenkels 8 and 8 and for adjusting the coefficient of friction with the sheave. The polymer compound has good abrasion resistance and weather resistance, and has an appropriate degree. It is preferable that the material has elasticity, has a relatively high coefficient of friction, and does not hydrolyze. Examples thereof include synthetic resins such as polyurethane-based and ether-based polyurethane elastomers, and rubber.

The polymer compound 100 is composed of Schenkel 8,
A layer 101 having a predetermined thickness T is formed from the outer diameter (circumscribed circle) of the side Schenkel through the gap between the two and is adhered to the polymer compound coating 9 on the surface of the core Schenkel 7. If the coating thickness T of the entire coating layer 10 is too small, the durability is poor and the wear life is reduced. If the thickness is too large, not only the flexibility of the rope is impaired, but also the rope diameter becomes large, and the strength efficiency is lowered. The method of forming the entire coating layer 10 is arbitrary, for example, using an extruder.

In manufacturing, the spiral rope is formed by passing the side schenkel 8 between about three rolls arranged in a staggered manner in the step of twisting the element rope 1 ′, and after passing through the voice,
This is done by passing through a leveling roll. The mold ratio is preferably about 0.60 to 0.90, more preferably 0.65 to
It may be performed at 0.85. Here, the type ratio refers to a ratio of a rope diameter to a height of the Schenkel when the Schenkel is taken out from the rope. According to this step, it is possible to prevent the rope from rotating and prevent the rope from scattering, and adjust the gap between the side schenkels to be uniform and optimal.

What is shown is merely an example of the present invention, and it goes without saying that ropes of other configurations are also included. FIG. 11 shows a 7 × (7 × 12) rope of the present invention. Specifically, the structural formula is ｛(1 × 12) +
6 × (1 × 12)｝ + 6 × ｛(1 × 12) + 6 × (1 ×
12)｝. The same parts as those in FIG. 3 are denoted by the same reference numerals, and description thereof is omitted. In this case, unlike the rope of FIG. 3, the core strand 7a of the core Schenkel 7 is made by twisting 12 strands at once, for example, in the Z direction. The side strand 7b is formed by twisting 12 strands at a time in, for example, the S direction. And the core Schenkel 7 is the core strand 7a
Is formed by arranging six side strands 7b around the center, for example, by aligning them in the Z direction. Thereafter, a polymer compound coating is applied. The side Schenkel 8 is the same as the core Schenkel 7 except that the twist direction is reversed.

FIG. 12 shows a rope of the present invention of 7 × (7 × 7). Specifically, the structural formula is ｛(1 + 6) +
6 × (1 + 6)｝ + 6 × ｛(1 + 6) + 6 × (1+
6) Consists of｝. The same reference numerals are given to the same parts in FIG. 3, and the description will be omitted. In this case, the core strand 7a of the core Schenkel 7 has six side strands 701 arranged around one core strand 700 and twisted in the Z direction, for example, and the side strand 7b is also one core strand. It is made by arranging six side strands 704 around 703 and twisting them in the S direction, for example. And the core core Schenkel 7 'arranges six side strands 7b around the core strand 7a,
For example, the core Schenkel 7 is formed by aligning in the Z direction and then coated with a polymer compound.
Becomes The side Schenkel 8 is the same as the core Schenkel 7 except that the twist direction is reversed.

The above description is only some examples of the present invention, and the present invention is not limited to these examples. For example, the twist direction of the core Schenkel 7 and the twist direction of the side Schenkel 8, the twist direction of the strands 7a and 7b of the core Schenkel 7, and the twist direction of the strands 8a and 8b of the side Schenkel 8 may be opposite to those described above.

[0032]

According to the characteristics of the wire rope according to the present invention, since the elongation is as small as 4 to 6%, it is suitable for use in elevators and cargo handling. The flexibility is 1200-2000, while the conventional fiber core type is 600-700.
Because it is easy to bend. The modulus of elasticity is 74,000 N / mm ² or more, whereas the conventional fiber core type has a modulus of 40,000 to 60,000 N / mm ^2, which is also a characteristic suitable for elevators and cargo handling. In the S bending fatigue test, the conventional fiber core type is 20,000 to 40,000 times under the conditions of D / d = 20, SF = 10, that is, a test at a load of 1/10 of the calculated breaking load. It shows extremely high fatigue resistance exceeding 400,000 times.

In the rope according to the present invention, the core schunkel 7 and the side schenkel 8 are formed by twisting a large number of strands made of a high-strength steel wire rod having a small diameter. Can be made thinner and lighter, and further excellent fatigue properties can be realized, so that the diameter of the sheave 4 can be reduced. That is, for example, since the rope weight including the coating can be reduced by 20% or more compared with the conventional case, the diameter SD of the sheave 4 can be reduced to 50% or less as compared with the conventional case as shown in FIG. Further, since the torque of the motors for driving the sheave 4 can be reduced by downsizing the sheave 4, the dimensions can be reduced. Further, since the rope can be reduced in weight, the capacity of the motors can be reduced.

The core schenkel 7 and the side schenkel 8 have the same specifications except that the twisting directions are opposite, which is advantageous in cost. That is, a gap can be formed between the side schenkels by applying the polymer compound coating 9 only to the core schunkel 7 to increase the outer diameter. The polymer compound easily enters the inside through the gap. Then, the gap size between the side Schenkels can be easily controlled only by changing the coating diameter, that is, the thickness of the polymer compound coating 9 without changing the diameter of the core Schunkel 7.

As described above, the core Schunkel 7 has the polymer compound coating 9 and the side Schenkel 8 is arranged around the polymer compound coating 9 and twisted. However, since metal touch does not occur and fretting is prevented, the life of the rope can be improved. Further, since the diameter of the core schunkel 7 is increased by the amount corresponding to the polymer compound coating 9, it functions as a spacer,
A gap can be formed in the side Schenkels 8, 8 where the polymer compound of the entire coating layer 10 can easily penetrate and fill. For this reason, fretting between the side Schenkels 8 and 8 is reduced, and the fatigue property can be improved.

Further, the rope surface is covered by the entire coating layer 10, and the hardness of the entire coating layer 10 is smaller than that of the sheave 4, so that abrasion of the sheave can be prevented. The friction coefficient can be freely controlled by selecting the polymer compound.
Since a round groove as shown in (a) is sufficient, the cost can be reduced. However, the rotational movement of the sheave due to the rotation of the motor is accurately transmitted to the rope, and the rotational movement of the sheave and the vertical movement of the car are linked well, so that accurate position control of the car can be performed, so that the riding comfort can be improved. . Further, since the rope cross section has a circular shape, the influence of rotation and torsion (partial disconnection due to single load) is reduced.

Also, the core Schenkel 7 and the side Schenkel 8
Are configured such that the outer diameters of the core strands 7a, 8a are larger than the outer diameters of the side strands 7b, 8b, respectively, and the core Schenkel 7 has a different twisting direction of the core strand 7a and a twisting direction of the side strand 7b. When the twist direction of the core strand 8a and the twist direction of the side strand 8b are different from each other and the twist direction is opposite to that of the core strand 7, the inconvenient rope rotation can be eliminated. The adhesive relationship between the compound coating 9 and the entire coating layer 10 is stabilized, and the durability can be increased.

[0038]

EXAMPLES Example 1 (1) Elementary Wire As a raw material, a high carbon steel wire having a diameter of 5.5 mm (C: 0.8
2%, Si: 0.21%, Mn: 0.48% balance iron and unavoidable impurities). This steel wire was drawn in the next step to obtain a strand. 1) After pickling, perform cold drawing 10 times to obtain a wire diameter of 2.0 m.
m, and this was air-patterned at about 980 ° C., pickled, and then cold-drawn about 6 times to obtain a wire diameter of 1.2.
mm, heated at about 980 ° C, subjected to lead patenting at about 550 ° C, pickled, washed with hot water, galvanized by electroplating, and washed with an aqueous type lubricant.
Approximately 0 times of wet drawing are performed, and the final diameter is 0.20 mm to 0.1 mm.
A 210 mm strand was obtained. The characteristics of each strand are tensile strength 3
20 kg / mm ² and elongation at break 2%.

(2) Manufacture of core schenkel 2-1) Manufacturing process of core schenkel core strand First step: 1 + 6 One core strand having a diameter of 0.208 mm and six side strands having a diameter of 0.205 mm Was twisted in the Z direction at a twist pitch of 6.3 mm to form an inner layer having an outer diameter of 0.62 mm. Second step: (1 + 6) +12 0.205 mm diameter for outer layer around the inner layer (1 + 6)
Were twisted in the Z direction at a twist pitch of 10 mm to obtain a core strand having an outer diameter of 1.03 mm.

2-2) Manufacturing process of side strand of core Schenkel First step: 1 + 6 One core wire having a diameter of 0.205 mm and six side wires having a diameter of 0.202 mm are twisted at a pitch of 6.3 mm. To obtain an inner layer having an outer diameter of 0.61 mm. Second step: (1 + 6) +12 Around the inner layer (1 + 6), a diameter of 0.202 mm for the outer layer
Were arranged and twisted in the S direction at a twist pitch of 10.00 mm to obtain a side strand having an outer diameter of 1.01 mm.

2-3) Core Schenkel Twist Step II (1+
6) +12｝ + 6 × {(1 + 6) +12} 2-
One core Schenkel core strand obtained in 1) (diameter 1.0
3 mm), the six core Schenkel-side strands (diameter 1.01 mm) obtained in 2-2) are arranged, and the twist pitch is 2
Twisted in the Z direction at 2.00 mm, a core Schenkel with an outer diameter of 3.04 mm was obtained.

(3) Coating of core Schenkel Molten polyethylene was extruded with an extruder, the core Schenkel (diameter 3.04 mm) was coated with a thickness of 0.30 mm, and a resin-coated core Schenkel having a finished diameter of 3.64 mm. I got

(4) Manufacture of side Schenkel 4-1) Manufacturing process of side strand of Schenkel First step: 1 + 6 0.205 m in diameter around a single core strand having a diameter of 0.208 mm
m side strands were arranged and twisted in the S direction at a twist pitch of 6.3 mm to obtain an inner layer having an outer diameter of 0.62 mm. Second step: (1 + 6) +12 Twelve side strands having a diameter of 0.205 mm for the outer layer are arranged on the inner layer and twisted in the S direction at a twist pitch of 10 mm to obtain a core strand having an outer diameter of 1.03 mm. Was.

4-2) Manufacturing process of side strand of side Schenkel First step: 1 + 6 A side element wire of 0.202 mm in diameter is arranged around a core element wire of 0.205 mm in diameter, and Z is formed at a twist pitch of 6.3 mm. By twisting in the direction, an inner layer having an outer diameter of 0.61 mm was obtained. Second step: (1 + 6) +12 A side wire having a diameter of 0.202 mm is arranged on the inner layer, twisted in the Z direction at a twist pitch of 10.00 mm, and an outer diameter of 1.20 mm.
A side strand of 01 mm was obtained.

4-3) Twisting process of side Schenkel ｛(1+
6) +12｝ + 6 × ｛(1 + 6) +12｝ 4-1) One core Schenkel core strand (diameter 1.0
3 mm), the six core Schenkel-side strands (diameter 1.01 mm) manufactured in 4-2) are arranged, and the pitch is 2 mm.
Twisted in the S direction at 2.00 mm to obtain a side Schenkel having an outer diameter of 3.04 mm.

(5) Rope twisting process Using a tubular type twisting machine, a side Schenkel (3.04 m) was wound around the coated core Schenkel (3.64 mm).
m) Six wires were arranged, twisted in the twist direction Z at a pitch of 70.00 mm, and a raw rope having an outer diameter of 9.73 mm was obtained.

(6) Forming and Warming A twisting machine is provided with a forming device in which three rolls having a diameter of 10.0 mm are arranged in a staggered manner, and a diameter of 60 m is provided downstream of the voice.
9 + 10 pairs of leveling rolls forming a pair at the top and bottom of m were arranged, and the leveling and averaging were performed at an average rate of 70%.

(7) Entire coating The molded rope was coated with molten polyurethane to a thickness of 0.50 mm by an extruder to obtain a finished rope having a diameter of 10.73 mm. The obtained rope had a steel material cross-sectional density of 35.1%, a surface friction coefficient of 0.4 μm, and a breaking load of 63 kN.

When three ropes of the present invention were used in a simulated elevator having a car and a counterweight of 2 tons, a sheave with a diameter of 150 mm, three grooves and a radius R of 5.25 mm, and a safety factor of 10 were used. I was able to drive smoothly. For comparison, the wire diameter is 0.475 to 0.955.
Comparative rope using low-carbon steel strands (C: 0.42 wt%) with a length of 8 mm: structure 8 x S (19), diameter 12.5 mm, strength 63.5 KN x 3 wires, used for the simulated elevator As a result, unless the sheave diameter was 500 mm, the sheave groove was three, and the groove R was 6.2 mm without undercut, smooth operation could not be performed.

Example 2 Various ropes were manufactured by applying the present invention. 1) Rope of 7 × (7 × 12) structure As the element wire, 588 galvanized wires (having the same tensile strength and elongation characteristics as in Example 1) in the range of 0.245 to 0.265 mm were used. The outer diameter of the core Schenkel is 3.0
9 mm was coated with polyethylene to a thickness of 0.3 mm to give a finished outer diameter of 3.69 mm. The raw rope diameter before coating is 9.8
7 mm, rope diameter 10.87 after polyurethane resin coating
mm. The characteristics of this rope are: breaking load: 62k
N, steel material cross-sectional density: 33.3%, surface friction coefficient: 0.4
Met. The twist direction is as follows. Core Schenkel: {(S + Z) + (Z + S)} Z, Side Schenkel:
{(Z + S) + (S + Z)} S, rope: Z.

2) A 7 × (7 × 7) rope having a galvanized wire (having the same tensile strength and elongation characteristics as in Example 1) in the range of 0.250 to 0.260 mm
Forty-three were used. The core Schenkel is coated with polyethylene to a thickness of 0.25 mm to an outer diameter of 2.28 mm and has a finished outer diameter of 2.25 mm.
It was 78 mm. The raw rope diameter before coating is 7.34 mm,
The rope diameter after the polyurethane resin coating was 8.34 mm. The characteristics of the rope were a breaking load: 36 kN, a cross-sectional density of a steel material: 31.1%, and a surface friction coefficient: 0.5.

The twist direction is as follows. Core Schenkel: {(S + Z) + (Z + S)} Z, Side Schenkel:
{(Z + S) + (S + Z)} S, rope: Z. In addition, when the rope of the same structure is made using 343 galvanized wires (having the same tensile strength and elongation characteristics as those of Example 1) in the range of 0.270 to 0.290 mm, the breaking load is 45 kN. And the steel material cross-sectional density was 33.9%.

[0053]

According to the present invention described above, the wire diameter (WR) is determined in relation to the rope diameter (DR) before the entire coating.
Is a wire rope using a high-strength steel strand satisfying 15 ≦ DR / WR ≦ 100, a plurality of side strands 7b are arranged around a core strand 7a formed by twisting the strands, and twisted; Using a core Schenkel 7 coated with a polymer compound 9 on the outer periphery, a plurality of side strands are wound around a core strand 8a in which strands are twisted around the core Schenkel 7 coated with the polymer compound 9. 8b and twisted together, and a plurality of side schenkels 8 whose outer diameter is relatively smaller than the core schenkel are laid and twisted, and the entirety including the side schenkel 8 is coated with a polymer compound. Therefore, the following excellent effects can be obtained.

1) Since a large number of small-diameter strands of high-strength material are twisted, it is possible to obtain a small-diameter, lightweight, lightweight rope that satisfies the required strength with good fatigue properties. Can be reduced in size, and space can be saved.

2) A polymer compound coating 10 is provided around the side Schenkel 8, and this portion comes into contact with the sheave, so that the sheave can be prevented from being worn and the coated polymer compound increases the friction coefficient. This eliminates the need for special sheave groove processing and double wrapping of the rope with respect to the sheave. In particular, since the double lap is not required, the force acting on the sheave shaft can be reduced, so that the size of the shaft and the bearing can be reduced, so that the cost can be reduced.

3) Since the core Schenkel 7 is coated with a polymer compound, fretting with the side Schenkel 8 is alleviated, and the life of the rope can be improved.
Since the diameter of the core Schenkel 7 is increased by being coated with the polymer compound, a gap can be formed between the side Schenkels 8 and 8. , 8. For this reason, the fretting between the side Schenkels 8, 8 is alleviated, the fatigue property is improved, and the life of the rope can be improved. 4) Since the penetration gap of the polymer compound between the side schenls can be easily controlled only by changing the coating thickness of the polymer compound without changing the diameter of the core Schenkel 7, the properties of the whole coated polymer compound I can respond immediately. Thereby, productivity can be improved.

According to the second aspect, an excellent effect of providing a highly practical elevator rope capable of saving space and reducing the cost of the system can be provided by the characteristics of the first aspect.

According to the third aspect, since the core Schenkel 7 and the side Schenkel 8 are of the same specification except that the twisting directions are opposite, the manufacturing is easy and the cost can be reduced. Excellent effect that can be obtained.

According to the fourth aspect, the core Schenkel 7 and the side Schenkel 8 are configured such that the outer diameters of the core strands 7a, 8a are larger than the outer diameters of the side strands 7b, 8b, respectively. The twist direction of the strand 7a and the twist direction of the side strand 7b are different. In the side Schenkel 8, the twist direction of the core strand 8a and the twist direction of the side strand 8b are different, and the twist direction is opposite to that of the core Schenkel 7. In addition, an inconvenient rope rotation property can be eliminated, whereby an excellent effect of stabilizing the adhesive relation between the polymer compound coating 9 and the entire coating layer 10 and increasing the durability can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram schematically showing an example of an elevator in which the present invention is applied to an elevator rope.

FIG. 2 is a partially cutaway perspective view showing an example of the rope of the present invention.

FIG. 3 is an enlarged sectional view taken along line III-III in FIG. 2;

4A is a cross-sectional view showing a first step of manufacturing a core strand of a core Schenkel in the rope of the present invention, and FIG. 4B is a cross-sectional view showing a second step of the same.

FIG. 5A is a cross-sectional view showing a first step of manufacturing a side strand of the core Schenkel in the rope of the present invention, and FIG. 5B is a cross-sectional view showing the same second step.

6A is a cross-sectional view of a core Schenkel in the rope of the present invention, and FIG. 6B is a cross-sectional view of the core Schenkel after resin coating.

FIG. 7A is a cross-sectional view showing a first step of manufacturing a core strand of the side Schenkel in the rope of the present invention, and FIG. 7B is a cross-sectional view showing the same second step.

8A is a cross-sectional view illustrating a first step of manufacturing a side strand of a side Schenkel in the rope of the present invention, and FIG. 8B is a cross-sectional view illustrating a second step of the same.

FIG. 9 is a sectional view of the side Schenkel of the present invention.

FIG. 10 is an enlarged sectional view of the elementary rope of the present invention.

FIG. 11 is an enlarged sectional view showing another example of the rope of the present invention.

FIG. 12 is an enlarged sectional view showing another example of the rope of the present invention.

13A is a side view of a sheave used by the rope of the present invention, and FIG. 13B is a side view of a sheave used by a conventional rope.

[Explanation of symbols]

 Reference Signs List 1 wire rope 4 sheave 7 core Schenkel 7 'element core Schenkel 7a core Schenkel core strand 7b core Schenkel side strand 8 side Schenkel 8a side Schenkel core strand 8b side Schenkel side strand 9 polymer coating 10 whole coating

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ichiro Nakamura 832 Horiguchi, Hitachinaka-shi, Ibaraki Pref. System Plaza Katsuta Hitachi Mito Engineering Co., Ltd. (72) Inventor Akihiro Omiya 1070 Ichimo, Hitachinaka-shi, Ibaraki (72) Inventor Shota Iwakura 502, Kandachicho, Tsuchiura-shi, Ibaraki F-term in Machine Research Laboratory, Hitachi, Ltd.F-term (reference) GG03 GG05 GG13 GG40 3F305 BB02 BB14

Claims (4)

[Claims] 1. A wire rope using a high-strength steel wire having a wire diameter (WR) of 15 ≦ DR / WR ≦ 100 in relation to the rope diameter (DR) before the entire coating. A plurality of side strands 7b were arranged around a core strand 7a formed by twisting and twisted, and the strand was twisted around one core Schenkel 7 having a polymer compound coating 9 on the outer periphery. A plurality of side strands 8b are arranged around the core strand 8a and twisted, and a plurality of side Schenkels 8 having an outer diameter relatively smaller than the polymer compound-coated core Schenkel 7 are arranged and twisted, A wire rope, wherein the entirety including the side Schenkel 8 is coated with a polymer compound 10. 2. The wire rope according to claim 1, which is used as an elevator rope. 3. The wire rope according to claim 1, wherein the core schenkel 7 and the side schenkel 8 are of the same specification except that the twisting directions are opposite. 4. The core schenkel 7 and the side schenkel 8 each have an outer diameter of the core strands 7a, 8a.
b, 8b, the twist direction of the core strand 7a and the twist direction of the side strand 7b are different in the core Schenkel 7, and the twist direction of the core strand 8a and the side strand in the side Schenkel 8 are different. 8
The twist direction of b is different and the twist direction is core Schenkel 7
The wire rope according to claim 1, wherein the wire rope is opposite to that of the wire rope.