CN1289378C - Rope for elevator - Google Patents

Abstract

The present invention relates to an elevator cable which is provided with a strip-shaped cable body that has multiple sub-cables and a cladding body integrally made of resin for cladding the sub-cables, wherein the sub-cables comprise multiple strands which are mutually entwisted in parallel. In addition, the sub-cables are arranged on a cross section vertical to the length direction of the cable body.

Description

elevator rope

technical field

The present invention relates to belt-shaped elevator ropes for elevators and for suspending the car.

Background technique

For example, Japanese Patent Publication No. 2002-504471 discloses various configurations of an elevator system in which a car and a counterweight are suspended by belt ropes. However, the specific structure of the belt-shaped rope has not been sufficiently shown, and it is necessary to obtain a structure of the belt-shaped rope that can achieve a long life while ensuring stable strength.

Contents of the invention

In order to solve the above-mentioned problems, an object of the present invention is to obtain an elevator rope that can achieve a long life while ensuring stable strength.

The elevator rope of the present invention has a belt-shaped rope body and is used for suspending the elevator car. The rope body has a plurality of sub-ropes formed by parallel twisting of a plurality of strands, and the coated sub-ropes are integrated. The covering body is made of resin, the sub-strings are arranged in a row in a cross-section perpendicular to the length direction of the rope body, and the sub-strings and the covering body are connected to each other by an adhesive.

In addition, the elevator rope of the present invention has a belt-shaped rope body for suspending an elevator car. The rope body has a resin core material extending in the length direction of the rope body, and a plurality of sub-rope aggregates of multiple sub-ropes twisted around and twisted with a core material; The bodies are arranged in a row with a section perpendicular to the length direction of the rope body, and the resin core material is sandwiched between adjacent sub-ropes.

Description of drawings

Fig. 1 is a sectional view of an elevator rope according to Embodiment 1 of the present invention.

Fig. 2 is a sectional view of an elevator rope according to Embodiment 2 of the present invention.

Fig. 3 is a sectional view of an elevator rope according to Embodiment 3 of the present invention.

Fig. 4 is a sectional view of an elevator rope according to Embodiment 4 of the present invention.

Detailed ways

Hereinafter, the best embodiments of the present invention will be described with reference to the accompanying drawings.

Embodiment 1

Fig. 1 is a sectional view of an elevator rope according to Embodiment 1 of the present invention. In the drawing, a belt-shaped rope main body 1 has seven strands 2, and a resin covering body 3 that covers the strands 2 and forms an integral body. Each strand 2 has a plurality of steel strands 4 . The strands 4 are twisted parallel to each other (refer to JIS G 3525 12.2b). In all strands 2, all strands 4 are laid in parallel. The sub-ropes 2 are arranged side by side on the cross-section ( FIG. 1 ) of the rope body 1 perpendicular to the longitudinal direction. That is, the seven sub-ropes 2 are spaced from each other along the width direction of the rope body 1 (the left-right direction in FIG. 1 ) on a cross-section perpendicular to the length direction of the rope body 1 and arranged in a straight line.

The diameter of the rope strand 4 is preferably about 1/400 of the diameter of the sheave (not shown) around which the rope body 1 is wound. In this way, the bending stress of the sheave can be reduced and the fatigue resistance can be improved. In addition, in order not to make the diameter of the strands 4 too small, the cross-sectional structure of the strand 2 is preferably a warrington (ウオリントンタイプ) type compared to the sealed type and the filled type specified in JIS G 3525.

The covering body 3 is made of, for example, thermoplastic polyurethane resin. Each of the strands 2 is coated with an adhesive 5 at least on the outer peripheral portion to integrate the strands 2 and the covering body 3 . That is, the substring 2 and the covering body 3 are bonded to each other by the adhesive 5 . The adhesive 5 can also be applied at any time before and after the strands 4 are twisted.

In such an elevator rope, since the strands 2 are arranged side by side and are covered with a resin covering body 3, the movement of the strands 2 can be prevented, and at the same time, the strands 2 can be prevented from rubbing against each other, thereby ensuring stable operation. Strength and long life at the same time.

In addition, since the strands 4 constituting each sub-rope 2 are twisted in parallel, the strands 4 are in line contact and constrained to each other. In this way, the mutual contact pressure of the strands 4 is small, and internal abrasion of the strands 2 is less likely to occur, whereby stable strength can be ensured and a longer life can be achieved.

Especially in Embodiment 1, since all the strands 4 of all the strands 2 are twisted in parallel, uniform strength can be ensured over the entire cross-section and the shape stability is good.

In addition, the strands 4 made of steel and the covering body 3 made of hard polyurethane resin are used, and the sub-rope 2 and the covering body 3 are bonded to each other by an adhesive 5, so sufficient wear resistance can be ensured. properties, and simultaneously the stability of the belt and the bundling of the sub-rope 2 can be improved.

Here, when the overall strength of the rope main body 1 decreases and damage progresses, the strands 2 are broken in order of greater load load or greater damage. On the other hand, if the number of strands 2 is increased in advance, it becomes difficult for each strand 2 to bear the load equally, and it is impossible to increase the strength in proportion to the number of strands 2 .

In addition, in an elevator rope integrated with the covering body 3 , it is difficult to detect how damaged the strands 4 inside the covering body 3 are. That is, it is generally believed that whether the sub-rope 2 is damaged to the extent that the outer surface of the covering body 3 is deformed, at least one sub-rope 2 is completely cut, otherwise it is impossible to judge the replacement period of the rope body 1 .

In this regard, in order to ensure that the remaining strength of the rope body 1 is about 80% when it is replaced according to the service life, more than 5 sub-ropes 2 need to be used. However, when the strength drops to the point where one strand 2 breaks, it can be predicted that the damage to the other strands 2 will also progress and lead to a decrease in strength. Usually, since the standard breaking load has a margin, the remaining strength when the replacement standard of JIS is reached is about 5% lower than the standard value.

Seek the optimal root number of sub-rope 2 from the above content. That is, assuming that the predetermined residual strength is a, the normal residual strength under the replacement standard is b, the number of sub-ropes is N, and the breaking load of sub-rope 2 is P, then the formula a×P×N=b×P(N- 1) Established. If a=80%, b=95%, then 0.8×P×N=0.95P(N-1), N=6.3, that is, about 7 pieces are obtained. Therefore, sufficient residual strength can be ensured only by using at least seven or more strands 2 .

In addition, the material of the covering body 3 is not limited to thermoplastic polyurethane resin, and can be appropriately selected according to usage conditions and the like. However, when used in a high-temperature, high-humidity environment, rigid polyurethane that is less prone to hydrolysis is preferable to ester-based polyurethane that is prone to hydrolysis.

Implementation form 2

Fig. 2 is a sectional view of an elevator rope according to Embodiment 2 of the present invention. In the drawing, a belt-shaped rope main body 11 has seven strand aggregates 12, and a resin covering body 13 that covers the strand aggregates 12 and forms an integral body. Each sub-rope assembly 12 is arranged side by side on a cross section perpendicular to the longitudinal direction of the rope body 11 . That is, the seven sub-rope assemblies 12 are arranged on a straight line with intervals between each other along the width direction of the rope body 11 in a cross section perpendicular to the longitudinal direction of the rope body 11 .

Each strand assembly 12 includes a resin core material 14 extending in the longitudinal direction of the rope body 11 and three strands 15 arranged around the core material 14 and twisted with the core material 14 . Each strand 15 has a plurality of steel strands 16 . The strands 16 are twisted parallel to each other. In all strands 15, all strands 16 are laid in parallel.

The three strands 15 of each strand assembly 12 are arranged around the core material 14 with a triangular cross section. The sub-string assemblies 12 are arranged such that the cross-sectional configuration shapes of the sub-strings 15 are alternately reversed.

As the material of the core material 14, for example, a thermoplastic resin such as polypropylene resin, polyethylene resin, or ethylene, or a material obtained by twisting synthetic fibers such as high-strength aramid fibers or polypropylene fibers at high density can be used. .

Adhesive 5 is applied to at least the outer peripheral portion of each strand 15 so as to be integrated with covering body 13 . That is, the substring 15 and the covering body 13 are bonded to each other by the adhesive 5 .

In such an elevator rope, since the strand aggregates 12 are arranged side by side and covered with a resin covering body 13, movement of the strand aggregates 12 can be prevented, and at the same time, the strand aggregates 12 can be prevented from rubbing against each other. Therefore, it is possible to achieve a long life while ensuring stable strength.

In addition, since the strands 16 constituting each of the sub-ropes 15 are twisted in parallel, internal wear of the sub-ropes 15 is less likely to occur, thereby ensuring stable strength and achieving longer life.

In addition, since the core material 14 and the three strands 15 constitute the strand assembly 12, thinner strands 16 can be used, and the applicable sheave diameter can be reduced.

In addition, the three substrings 15 are arranged around the core material 14 with a triangular cross section. The sub-rope aggregates 12 are configured so that the cross-sectional shape of the sub-ropes 15 is alternately reversed, so the sub-rope aggregates 12 can be arranged in high density, the width of the rope body 11 can be reduced, the strength can be improved, and the size of the applicable sheave can also be reduced. width

Implementation form 3

Next, Fig. 3 is a sectional view of an elevator rope according to Embodiment 3 of the present invention. The sub-rope 18 used in this example includes a steel core rope 16 as a strand, and six outer peripheral ropes 17 as strands arranged around the core rope 16 and twisted in parallel to each other. Other structures are the same as those of Embodiment 2.

Such an elevator rope has good shape stability against external force because the strand 18 has a simple and stable cross-sectional structure. In addition, the diameter of the outer peripheral cord 17 can be greatly increased, and flexibility and wear resistance can be ensured in a balanced manner.

In addition, since only one layer of the outer peripheral cord 17 is arranged around the core cord 16, the mutual movement of the outer peripheral cords 17 can be controlled, and the adhesion stability to the covering body 13 can be improved. Furthermore, while prolonging the life of the outer circumferential cord 17, the fatigue resistance of the bonded portion of the covering body 13 can be improved.

Embodiment 4

Next, Fig. 4 is a sectional view of an elevator rope according to Embodiment 4 of the present invention. The covering body 21 used in this example is made of rubber. In addition, no adhesive is applied to the strands 18, and instead, a coating 22 is formed on the outer peripheral portions of the core rope 16 and the outer peripheral rope 17, which are treated with phosphate coating such as phosphate coating or galvanizing. The other constitutions are the same as those of the third embodiment.

In such an elevator rope, since the adhesive force of the strand 18 to the covering body 21 is ensured by the coating film 22, it is easier to ensure the adhesive force than the step of applying an adhesive.

In addition, in the case where the coating body of the above-mentioned Embodiments 1 and 2 is made of rubber, a coating film treated with a phosphating salt coating on the strands can be used instead of the adhesive agent, and the bond between the strands and the strands can be ensured. Cohesion of the coating.

Claims (6)

1. a Riata for elevator has banded rope body, is used to suspend in midair the car of elevator, it is characterized in that,

Described rope body has: many roots rope of the many parallel afterturns of rope strand; Coat described son rope and form incorporate resinous cladding, described son rope disposes with the length direction vertical cross-section horizontally-arranged with the rope body, interconnects by lining cement between described son rope and the described cladding.

2. Riata for elevator according to claim 1 is characterized in that, described rope strand is a steel, and described cladding is thermoplastic polyurethane resin's system.

3. a Riata for elevator has banded rope body, is used to suspend in midair the car of elevator, it is characterized in that,

Described rope body has:

Comprise the resinous core that extends along the length direction of described rope body, be configured in described core around and with many roots rope complex of many roots rope of described core afterturn;

And coat described son rope complex and form incorporate resinous cladding,

Described son rope comprises many rope strands of parallel afterturn,

Described son rope complex is with the cross section horizontally-arranged configuration vertical with the length direction of described rope body;

Described resinous core is clipped between the adjacent child rope.

4. Riata for elevator according to claim 3 is characterized in that, described core is a poly-vinyl resin system.

5. Riata for elevator according to claim 3 is characterized in that, described core is a synthetic resin fiber system.

6. Riata for elevator according to claim 3 is characterized in that, described cladding is a rubber system, is formed with the coating film of handling through phosphatization salt tunicle at the peripheral part of described rope strand.

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