JP2011046462A - Elevator device and wire rope for elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prolong the lifetime of a wire rope for an elevator, and to reduce manufacturing costs. <P>SOLUTION: A wire rope for elevator includes a steel core 10 having a substantially circular overall section with a plurality of steel element wires 8 twisted, a core wire covering material 12 in which synthetic fibers are knit in a cylindrical shape to cover the entire circumference of the steel core 10, a solid lubricant 13 filled in the core wire covering material 12, strands 7d, formed by twisting a plurality of steel element wires 8, and arrayed so as to surround the core wire covering material 12, and a synthetic resin-made outer covering layer 14 which is arranged to cover the entire circumference of the plurality of strands 7d to cover the surface of the wire rope. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an elevator apparatus and an elevator wire rope.

  In recent years, for elevators for low-rise buildings, a structure without a machine room, which has a high degree of freedom in architectural design and can save space, is becoming common.

  FIG. 2 shows an example of a slidable elevator having a structure without a machine room. In FIG. 2, 1 is a passenger car, 2 is a counterweight, 3 is a driving sheave provided in the hoist, 4 is a main rope, 5a and 5b are suspension cars that suspend a passenger car 1 and a counterweight 2, 6 is a hoistway. One end of the main rope 4 is fixed to the upper part of the hoistway 6, and the suspension car 5 a of the car 1, the driving sheave 3, and the hoisting wheel 5 b of the counterweight 2 are routed in this order, and the other end is again raised. It is fixed at the top of the. The difference between the tension on the side of the car 1 of the main rope 4 and the tension on the side of the counterweight 2 and the frictional force generated between the driving sheave 3 and the main rope 4 are balanced, and the car 1 and the counterweight 2 are swayed. Driving.

As for the main rope 4, the fiber core structure defined in JIS B 3525 is the most common structure that has been used for elevators so far. An example of a cross section of a main rope having a fiber core is shown in FIG. In FIG. 3, 7a is a strand, 8 is a strand, 9 is a heart rope made of synthetic fiber or natural fiber. A structure in which six or eight strands 7a are twisted around the core rope 9 is normal, and when tension is applied to the main rope, a force acts in a direction in which the strand 7a compresses the heart rope 9. Regarding the strength of the main rope, the strength grade is defined in the above-mentioned standard, and the wire 8 having a breaking load of about 1300 N / mm ^{2 to} 1900 N / mm ² is properly used according to the grade.

  By the way, in recent years, a rope in which the entire rope is coated with a resin has been proposed from the viewpoint of miniaturization of the elevator drive system, improvement of the rope life, and environmental harmony. As a typical example of such a rope, the structure of the rope described in Patent Document 1 is shown in FIG. In FIG. 4, 110 is a coating resin made of urethane or the like provided on the outer periphery of the wire rope, 111a is a strand having a coating 112 on each surface, 113 is a strand formed by twisting the strand 111a, and individually polyethylene The strand 115 provided with a coating 114 made of polyurethane or the like is formed by twisting strands individually coated in the same manner as the strand 114, and the core cord is covered with a coating material such as polyethylene or polyurethane. It is. In the resin-coated rope of FIG. 4, the contact pressure between the strands is alleviated by the coating of each strand, and the entire circumference of the rope is covered with urethane, etc., so the contact pressure with the driving sheave is kept low. Therefore, the load during use is reduced as compared with the conventional wire rope, and it is considered that the life can be improved.

  The downsizing of the drive system depends on the rope life. In downsizing, the point is to downsize the hoisting machine (not shown) including the driving sheave 3 and the suspension wheels 5a, 5b, but by downsizing the driving sheave 3 and the suspension wheels 5a, 5b, Since the bending stress generated in the main rope 4 increases and the fatigue life decreases, the domestic regulations (e.g., the Building Standard Law) governing the structure of the elevator have the diameter D and the main rope of the driving sheave 3 and the suspension trucks 5a and 5b. The ratio (D / d) with the diameter d is assumed not to be less than 40. However, the damage to the rope is not only due to bending stress but also the influence of friction between the strands and between the strands and the sheave surface, and the resin-coated rope reduces the load caused by these frictions. Even if the suspension wheels 5a and 5b are reduced in size, it is considered that the same life as a conventional rope can be secured. Furthermore, since the resin-coated rope does not use grease for lubrication, there is no need for lubrication during maintenance, no contamination by grease occurs, and there is no need for waste oil treatment, thus reducing the environmental burden.

Japanese Patent No. 3724322

  Regarding the resin-coated rope, the following problem arises with respect to the structure in which the coating is performed for each element wire as described in the above-mentioned known examples in order to reduce the friction load inside the rope. That is, resins such as polyethylene, polyamide, and polyurethane are shown as coatings for reducing friction between strands and friction between strands, but friction between strands or between strands and cores. On the other hand, the inventors have confirmed on a trial basis that these resins are quick to break, and that a significant improvement in service life cannot be expected compared to conventional ropes.

  That is, according to the results of the bending fatigue test by the inventors, in such a resin-coated rope, the coating between the cord and the strand, or the coating between the strands is damaged first, and then the black circle in FIG. The period during which breakage rapidly progressed and the usable strength was ensured was not clearly different compared to conventional ropes.

  Here, FIG. 5 is a diagram showing a breaking state as a result of the breaking test of the resin-coated rope, in which the broken wire portion 120 is indicated by a black circle, and the unwired portion 121 is indicated by a white circle.

  In addition, since the conventional resin-coated rope is coated for each individual wire, the manufacturing cost is extremely high, and the rope diameter is more difficult to manage than in the past, which makes it difficult to manage the tension in actual use. Therefore, it is considered that the lifetime is reduced. Furthermore, since the ratio of the wire cross-sectional area with respect to the total cross-sectional area is small, it is conceivable that the elastic modulus of the rope is reduced due to the cushioning effect of the covering material against the tension load and is reduced more than the conventional rope. If the elastic modulus of the rope is greatly reduced, problems such as an increase in sinking when entering the car arise in the elevator.

  The present invention has been made in view of the above-mentioned problems that occur when applied to the main rope of an elevator, with respect to the resin-coated rope that covers the entire rope with a resin coating, and improves the life of the wire rope for the elevator, and The objective is to reduce manufacturing costs.

  In order to achieve the above object, an elevator apparatus according to the present invention suspends a ride car and a balance weight with a wire rope, and uses the drive sheave on which the wire rope is wound to provide the ride car and the balance weight. An elevator apparatus that frictionally drives in a slipping manner, wherein the wire rope has a substantially circular cross section as a whole, and the wire rope includes a steel core obtained by twisting a plurality of steel strands, and a synthetic fiber. A core rope covering material that is knitted into a tubular shape and covers the entire periphery of the steel core, and a solid lubricant filled in the core rope cover material, each of which twists a plurality of steel strands. A plurality of strands that are arranged to surround the core rope covering material, and an outer side made of a synthetic resin that is arranged so as to cover the entire periphery of the plurality of strands and covers the surface of the wire rope Having a covering layer, and characterized.

  The elevator wire rope according to the present invention is an elevator wire rope that hangs an elevator car and a counterweight and frictionally drives it with a driving sheave in a slidable manner, and has an approximately circular cross section as a whole. And a steel core obtained by twisting a plurality of steel strands, a core rope covering material arranged so as to cover the entire periphery of the steel core by knitting synthetic fibers in a cylindrical shape, and the core rope covering material A solid lubricant filled therein, a plurality of strands each formed by twisting a plurality of steel strands, the strands arranged so as to surround the core rope covering material, and the whole of the plurality of strands A synthetic resin outer covering layer that is disposed so as to cover the periphery and covers the surface of the wire rope.

  ADVANTAGE OF THE INVENTION According to this invention, the lifetime of the wire rope for elevators can be improved and manufacturing cost can be made cheap.

It is a cross-sectional view of one embodiment of an elevator wire rope according to the present invention. 1 is a schematic configuration diagram of an embodiment of an elevator apparatus according to the present invention. It is a cross-sectional view of a conventional fiber core constituting rope. It is a cross-sectional view of a conventional resin-coated rope. It is a cross-sectional view showing a damaged state of a rope using a conventional steel core coating resin.

  Hereinafter, an embodiment of an elevator apparatus using a resin-coated rope according to the present invention as a main rope will be described with reference to the drawings.

  FIG. 1 shows an embodiment of a main rope in the elevator apparatus of the present invention. In FIG. 1, a steel core 10 is obtained by twisting a plurality of steel strands 8a. The core rope covering material (blade) 12 is arranged so as to cover the entire periphery of the steel core 10 by knitting synthetic fibers in a cylindrical shape. The strands 7d are obtained by twisting a plurality of steel wires 8b, and a plurality (six in the example of FIG. 1) of the strands 7d are arranged so as to surround the outer side of the core rope covering material 12. An outer coating layer 14 made of urethane resin is formed to cover the entire periphery of the plurality of strands 7d and cover the surface of the wire rope. The core rope covering material 12 is filled with a solid lubricant 13.

  The heart rope covering material 12 is formed by knitting a synthetic fiber in a cylindrical shape with a thickness of about 0.2 mm to 0.5 mm, for example. When tension is applied, the cord rope covering material 12 receives a shearing force from the steel core 10 and the strand 7d. Therefore, as the synthetic fiber constituting the cord rope covering material 12, polypropylene or polyester excellent in wear resistance is desirable.

  Since the cord rope covering material 12 made of these materials is flexible unlike the conventional resin material coating, it has high durability against the bending of the steel core 10 and the pressing pressure from the strand 7d. Thus, the insulation function between the steel core 10 and the strand 7d can be maintained for a long time.

A solid lubricant 13 made of molybdenum disulfide MoS ₂ or tungsten disulfide WS ₂ is filled inside the core rope covering material 12 and between the wires 8 a of the steel core 10, and bears lubrication between the wires of the steel core 10. .

  The outer coating layer 14 is a urethane coating having a hardness of JIS A 90 or higher that is bonded to the strand 7d with a silane coupling agent or the like and covers the outer periphery of the rope. The outer coating layer 14 has a thickness of 1 mm or less at the thinnest portion. The thickness of the core rope covering material 12 and the thickness of the outer covering layer 14 are determined by the respective lifespans and the feed radius when it is wound around the drive sheave and sent. The thicker the coating, the higher the durability, but the feed radius when it is fed by a sheave changes greatly depending on the tension, so the tension difference between individual ropes increases, resulting in a reduction in rope life. . If it is the above-mentioned thickness, there is no problem in the change of the feeding radius by coating, and a sufficient coating life can be obtained.

  The solid lubricant 13 filled in the steel core 10 is sealed in the core rope covering material 12, but leaks to the outside of the heart rope cover material 12 over time. In the case of a lubricant having fluidity such as a general lubricating oil, it leaks to the outside of the core rope covering material 12 in the manufacturing process and reduces the adhesive life between the outer covering layer 14 and the strand 7d. , It is less likely to enter the adhesive interface, and the peeling between the outer coating layer 14 and the strand 7d can be reduced as compared with general grease.

The wire wires 8a and 8b of the wire rope are reinforced by heat treatment and drawing processing on the raw material. However, the smaller the cross-sectional area, the easier it is to obtain strength because the metal structure is homogenized. Those exceeding mm ² have been put into practical use. In general, the higher the strand strength, the higher the breaking load of the rope, so the number of ropes in the elevator system can be reduced. However, in the resin-coated rope, when the tension is increased, the burden on the outer coating layer 14 is increased, the coating life is shortened, and friction between the strands is increased. Therefore, it is necessary to select a wire strength suitable for the strength of the outer coating layer 14. Moreover, the extremely small diameter of the strands 8a and 8b deteriorates workability in maintenance work such as magnetic flaw detection, and also reduces the reliability of the main rope. Therefore, the cross-sectional area of the strands 8a and 8b is preferably 0.05 mm ² or more and 0.35 mm ² or less, and the wire rope with the strands in that range corresponds to a nominal diameter of 8 mm to 10 mm. Rope wires 8a used in the elevator apparatus of the present embodiment, 8b is, it is desirable to have a 2000N ^/ mm ² ~2500N ^/ mm 2 as a tensile strength. Because, if the breaking strength is within the range, the wire having the cross-sectional area within the above range can have both strength and appropriate ductility, and there is little quality variation, and the life of the outer coating layer 14 can be secured. It is.

  The main components and effects of the rope structure according to the present invention have been described with reference to FIG. FIG. 1 shows a 6-strand seal rope having a steel core (IWRC), that is, IWRC 6 × S (19) (7 × 7 + 6 × S [1 + 9 + 9]) with a cord rope covering material 12 and an outer covering layer 14. Although the added configuration is shown, the same effect can be obtained with other configurations such as an IWRC rope (7 × 7 + 6 × W [1 + 6 + (6 + 6)]) having a 6-strand Warrington configuration.

  As described above, by using the resin-coated rope of the present invention, a long life can be ensured even at a condition where repeated bending is applied as an elevator rope, and the elevator rope can be manufactured at a low cost.

DESCRIPTION OF SYMBOLS 1 ... Riding car 2 ... Balance weight 3 ... Drive sheave 4 ... Main rope (rope)
5a, 5b ... suspension wheel 7a, 7d ... strand 8, 8a, 8b ... strand 10, 15 ... steel core 11 ... covered strand 12 ... core rope covering material (blade)
13 ... Solid lubricant 14 ... Outer coating layer

Claims (9)

An elevator apparatus that suspends a vehicle and a counterweight with a wire rope, and frictionally drives the vehicle and the counterweight with a drive sheave on which the wire rope is wound.
The wire rope has a substantially circular cross section as a whole, and
The wire rope is
A steel core in which a plurality of steel strands are twisted together;
A shingle covering material arranged so as to cover the entire periphery of the steel core by knitting a synthetic fiber into a tubular shape;
A solid lubricant filled in the cord rope covering material;
Each of a plurality of strands obtained by twisting a plurality of steel strands, the strands arranged so as to surround the core rope covering material,
An outer covering layer made of a synthetic resin that is disposed so as to cover the entire periphery of the plurality of strands and covers the surface of the wire rope;
The elevator apparatus characterized by having.   The elevator apparatus according to claim 1, wherein the outer covering layer is made of urethane resin.   The elevator apparatus according to claim 1 or 2, wherein the core rope covering material is made of polypropylene or polyester.   The elevator apparatus according to any one of claims 1 to 3, wherein the solid lubricant is molybdenum disulfide or tungsten disulfide. 5. The steel element wire has a cross-sectional area of 0.05 mm ² or more and 0.35 mm ² or less, and a strength of 2000 N / mm ² or more. 5. The elevator apparatus as described in.   The elevator apparatus according to any one of claims 1 to 5, wherein a thickness of the core rope covering material is 0.2 mm or more and 0.5 mm or less.   The elevator apparatus according to any one of claims 1 to 6, wherein the outer covering layer has a hardness of JIS A 90 or more and a thickness of 1 mm or less.   The elevator apparatus according to any one of claims 1 to 7, wherein a hoisting machine including the driving sheave is disposed in a hoistway in which the passenger car and the counterweight are raised and lowered. . An elevator wire rope that suspends an elevator car and a counterweight and frictionally drives it by a driving sheave.
The whole has a substantially circular cross section, and
A steel core in which a plurality of steel strands are twisted together;
A shingle covering material arranged so as to cover the entire periphery of the steel core by knitting a synthetic fiber into a tubular shape;
A solid lubricant filled in the cord rope covering material;
Each of a plurality of strands obtained by twisting a plurality of steel strands, the strands arranged so as to surround the core rope covering material,
An outer covering layer made of a synthetic resin that is disposed so as to cover the entire periphery of the plurality of strands and covers the surface of the wire rope;
An elevator wire rope characterized by comprising:

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