CN109803912B

CN109803912B - Elevator rope and elevator device

Info

Publication number: CN109803912B
Application number: CN201680090016.3A
Authority: CN
Inventors: 光井厚
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2016-10-18
Filing date: 2016-10-18
Publication date: 2021-01-01
Anticipated expiration: 2036-10-18
Also published as: CN109803912A; JP6576575B2; KR102168962B1; WO2018073897A1; JPWO2018073897A1; KR20190039814A

Abstract

An elevator rope is provided with: a core body; and a plurality of outer layer strands twisted around the core. Each outer layer strand has: a centerline; a resin center line coating body which coats the periphery of the center line; an intermediate single-wire layer composed of a plurality of steel intermediate single wires twisted around the outer periphery of the center-wire coating body; and an outer single-wire layer composed of a plurality of steel outer single wires twisted around the outer periphery of the intermediate single-wire layer.

Description

Elevator rope and elevator device

Technical Field

The present invention relates to an elevator rope in which a plurality of outer layer strands are twisted around the outer circumference, and an elevator apparatus using the same.

Background

In conventional elevator apparatuses, there is a demand for downsizing of a hoisting machine based on reduction in sheave diameter and space saving due to the downsizing. To cope with this, a rope having a small cross-sectional diameter may be used, or a flat belt may be used instead of the rope.

However, when a small-diameter rope is used, the number of ropes is large, and therefore, there are problems such as an influence on other devices, an increase in time for winding the rope, and an increase in maintenance and inspection time.

On the other hand, as a method of reducing the bending stress acting on the rope without making the rope diameter extremely small, there is a method of reducing the diameter of the single wire by increasing the number of sub-ropes included in the rope or increasing the number of the single wires constituting the sub-ropes (for example, see patent documents 1 and 2).

Further, as a structure in which the number of wires constituting the sub-cord is suppressed to twenty-five or less while reducing the bending stress by reducing the diameter of the outer layer single wire constituting the sub-cord, a cord using a filler type sub-cord is known.

Further, a rope in which a fiber core is disposed at the center and a plurality of west-type sub-ropes are twisted around the outer periphery of the fiber core is also known.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 4296152

Patent document 2: japanese patent No. 5307395

Disclosure of Invention

Problems to be solved by the invention

In the conventional rope described above, there is a problem that, in the rope in which the number of sub ropes or the number of single wires is increased, the apparatus constituting the rope and the sub ropes becomes special, and productivity is deteriorated. Further, in the method of increasing the number of sub ropes, there is a problem that the sectional area of the metal portion included in the entire rope, that is, the single wire is reduced, and the breaking strength of the rope itself is reduced.

Further, in the rope using the filler type sub-rope, since the filler wire in the single wires constituting the sub-rope is very thin, when the rope is applied to a rope having a small diameter, the filler wire may be broken at the time of manufacture, or the sub-rope may be deformed due to abrasion of the filler wire at the time of use.

Further, in the sub-cord using the fiber core, there is a problem that the cross-sectional area of the steel wire portion of the entire sub-cord is reduced. Further, repeated bending may deform or wear the fiber core, thereby causing deformation of the sub-cord.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an elevator rope which can be easily manufactured and which can prevent a reduction in breaking strength and deformation of sub-ropes, and an elevator apparatus using the same.

Means for solving the problems

The elevator rope of the present invention comprises: a core body; and a plurality of outer layer sub-ropes twisted around the core, each outer layer sub-rope having: a centerline; a resin center line coating body which coats the periphery of the center line; an intermediate single-wire layer composed of a plurality of steel intermediate single wires twisted around the outer periphery of the center-wire coating body; and an outer single-wire layer composed of a plurality of steel outer single wires twisted around the outer periphery of the intermediate single-wire layer.

An elevator device of the present invention includes: a traction machine having a drive sheave; an elevator rope wound around a drive sheave and having a core and a plurality of outer layer strands twisted around the core; and a car suspended by the elevator ropes, each outer layer rope having: a centerline; a resin center line coating body which coats the periphery of the center line; an intermediate single-wire layer composed of a plurality of steel intermediate single wires twisted around the outer periphery of the center-wire coating body; and an outer single-wire layer composed of a plurality of steel outer single wires twisted around the outer periphery of the intermediate single-wire layer.

Effects of the invention

According to the present invention, it is possible to obtain an elevator rope which can be easily manufactured and which can prevent a decrease in breaking strength and deformation of a sub-rope, and an elevator apparatus using the same.

Drawings

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

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

Fig. 3 is a structural diagram showing an elevator apparatus using the elevator rope of fig. 2.

Detailed Description

The following describes a specific embodiment of the present invention with reference to the drawings.

Embodiment mode 1

Fig. 1 is a cross-sectional view of an elevator rope according to embodiment 1 of the present invention, showing a cross-section perpendicular to the longitudinal direction. In the figure, an elevator rope includes a fiber core 1 as a core and a plurality of outer layer strands 2 twisted around the outer periphery of the fiber core 1. In this example, eight outer layer strands 2 are used. The fiber core 1 is formed by twisting fibers.

Each of the outer layer strands 2 has a steel center wire 3, a resin center wire coating body 4 coating the outer periphery of the center wire 3, an intermediate single-wire layer 5 provided on the outer periphery of the center wire coating body 4, and an outer layer single-wire layer 6 provided on the outer periphery of the intermediate single-wire layer 5. As a material of the center-line cover 4, a thermoplastic resin such as polyethylene or polypropylene is used. The clad core is composed of a center line 3 and a center line clad body 4.

The intermediate wire layer 5 is composed of a plurality of steel intermediate wires 7 twisted around the outer periphery of the center wire coating body 4. The outer single-wire layer 6 is formed of a plurality of steel outer single wires 8 twisted around the outer periphery of the intermediate single-wire layer 5. In this example, the intermediate single-wire layer 5 is formed of twelve intermediate single wires 7, and the outer single-wire layer 6 is formed of twelve outer single wires 8. The intermediate element wire 7 and the outer element wire 8 have the same twist length, that is, are twisted in parallel.

The diameter of the center wire 3 is equal to or smaller than the diameter of the outer layer element wire 8 and is larger than the diameter of the intermediate element wire 7. The diameter of the intermediate element wire 7 is smaller than the diameter of the intermediate element wire 7 and the diameter of the outer layer element wire 8.

In such an elevator rope, the diameters of the intermediate element wires 7 and the outer layer element wires 8 can be reduced in a configuration of eight strands of rope that is generally used, and the number of element wires constituting each outer layer sub-rope 2 can be set to be within twenty-five. Therefore, as a twister for manufacturing the outer layer sub-cord 2, a device for manufacturing a normal elevator rope can be used.

Further, since the cord does not contain an extremely fine single wire, i.e., a filler wire, unlike the filler type, the filler wire is not broken at the time of manufacture or worn during use in the particularly small-diameter cord.

Further, when a rope having a diameter D of 10mm (outer layer single wire diameter of 0.66mm) and a rope having a diameter D of 400mm, which are generally used, are combined, that is, when D/D is 40, the strain applied to the rope by the sheave when bending is performed is 0.66/400 or 1.65 × 10^-3。

In contrast, in the elevator rope according to embodiment 1, 0.52mm is used, and 0.52/400 is used to give a bending strain of 1.3 × 10 when a sheave having the same diameter of 400mm is used to give a bending strain^-3. Thus, at 1.3/1.65-0.78 (═ 80%), the strain was reduced by about 20%. This reduces the bending stress and improves the bending fatigue of the rope.

In addition, when the fiber core is disposed at the center of the outer layer sub-cord 2, since there is a gap between the fibers, deformation is likely to occur against pressure from the outer periphery, and deformation due to aging and abrasion may occur. In contrast, in the elevator rope according to embodiment 1, since the coated core in which the center line 3 is coated with the center line coating body 4 made of resin is used, the outer layer sub-rope 2 in which the cross-sectional area of the steel wire portion is increased and which is hard to deform over the years can be formed.

Embodiment mode 2

Next, fig. 2 is a cross-sectional view of an elevator rope according to embodiment 2 of the present invention. In embodiment 2, the outer layer strands 2 each use a conductive center wire 9 made of synthetic fiber. The center line 3 is made of, for example, a carbon fiber bundle or a twisted yarn of carbon fibers.

Fig. 3 is a structural diagram showing an elevator apparatus using the elevator rope of fig. 2. A machine room 22 is provided above the hoistway 21. A traction machine base 23 is provided in the machine room 22. A hoisting machine 24 is supported by the hoisting machine base 23. The hoisting machine 24 has a drive sheave 25 and a hoisting machine main body 26. The hoisting machine main body 26 has a hoisting machine motor that rotates the drive sheave 25 and a hoisting machine brake that brakes the rotation of the drive sheave 25.

The suspension body 27 is suspended around the drive sheave 25. As the suspension body 27, a plurality of elevator ropes of embodiment 2 arranged in parallel are used.

The 1 st end of the suspension 27 is connected to the car 28. The 2 nd end of the suspension body 27 is connected to a counterweight 29. The car 28 and the counterweight 29 are suspended in the hoistway 21 by the suspension body 27, and are raised and lowered by rotating the drive sheave 25.

A pair of car guide rails 30 that guide the up-and-down movement of the car 28 and a pair of counterweight guide rails 31 that guide the up-and-down movement of the counterweight 29 are provided in the hoistway 21.

The car 28 has a car frame 32 to which the suspension body 27 is connected, and a car room 33 supported by the car frame 32.

The machine room 22 is provided with a control device 34 and a power supply device 35. A control 34 controls the operation of the car 28. The energization device 35 has a power source, a detector, and a resistor, and energizes the center line 9 of each elevator rope. The control device 34 and the energization device 35 are connected to the car 28 via a control cable 36.

When two of the eight center lines 9 included in each elevator rope are defined as the

center lines

9a and 9b, the

center lines

9a and 9b are short-circuited at the counterweight 29-side end portion. That is, the two

center lines

9a, 9b are connected in series. The

center lines

9a and 9b are drawn out from the elevator rope at the end portions on the car 28 side, and are connected to the energizing device 35 via the control cable 36.

Although not shown, two of the eight center lines 9 included in each elevator rope are short-circuited at each end on the counterweight 29 side, and the end on the car 28 side is connected to the energizing device 35 via the control cable 36.

The energizing device 35 detects whether or not a current flows through the center line 9. The controller 34 determines whether or not the outer layer strands 2 are broken by checking the conduction state of the center line 9. That is, when the current is interrupted, it is determined that the center line 9 is broken, and it is determined that the outer layer strand 2 including the center line 9 is broken.

The control device 34 determines whether or not the service of the elevator device can be continued based on the presence or absence of the breakage of the outer layer sub-ropes 2. For example, the control device 34 continues the service when the breakage of the outer layer string 2 is not detected, and stops the service when the breakage of the outer layer string 2 is detected.

In such an elevator rope and an elevator apparatus, the conduction state is constantly monitored by supplying electricity to the center line 9, and the breakage of the outer layer sub-ropes 2 can be rapidly detected, thereby improving safety.

Further, since the center wire 9 is covered with the center wire cover 4 made of resin, the intermediate wire 7 and the center wire 9 do not directly rub against each other even when they are repeatedly bent, and damage to the carbon fiber of the center wire 9 can be prevented.

In the above example, two center lines 9 are connected to each other, but four or more center lines 9 may be connected in series to be energized.

In the above example, all the center lines 9 of all the elevator ropes are energized, but there is also a method of energizing only a part of the center lines 9 as a sample.

Further, although the above example shows a method of always supplying power to the center line 9, there is also a method of connecting the power supply device 35 only during maintenance, and supplying power only during maintenance to perform inspection.

Further, the core is not limited to the fiber core.

The number of outer layer strands, the number of intermediate wires, and the number of outer layer wires are not limited to the above examples.

Further, the layout of the entire elevator apparatus to which the elevator rope of the present invention is applied is not limited to fig. 3.

Further, the type of elevator apparatus to which the rope for an elevator of the present invention is applied is not limited to the type of fig. 3. For example, the present invention can also be applied to a machine-roomless elevator, an elevator apparatus of a 2:1 system with a rope winding ratio, an elevator apparatus of a multi-car system, a double-deck elevator, or the like.

The elevator rope of the present invention can also be applied to a rope other than the rope for suspending the car 28, such as a compensating rope or a governor rope.

Claims

1. An elevator rope, comprising:

a core body; and

a plurality of outer layer strands twisted around the outer periphery of the core body,

each of the outer layer strands has:

a centerline;

a resin center line coating body which coats the periphery of the center line;

an intermediate single-wire layer composed of a plurality of steel intermediate single wires twisted around the outer periphery of the center-wire coating body; and

and an outer single-wire layer formed of a plurality of steel outer single wires twisted around the outer periphery of the intermediate single-wire layer.

2. The rope for an elevator according to claim 1,

the diameter of the central line is smaller than that of the outer layer single line.

3. The rope for an elevator according to claim 1,

the total number of the central lines, the intermediate single lines and the outer layer single lines is less than twenty-five.

4. The rope for an elevator according to claim 2,

5. The elevator rope according to any one of claims 1 to 4,

the centerline is comprised of synthetic fibers.

6. The elevator rope according to any one of claims 1 to 4,

the center line is electrically conductive.

7. The rope for an elevator according to claim 5,

the center line is electrically conductive.

8. An elevator device is provided with:

a traction machine having a drive sheave;

an elevator rope wound around the drive sheave and having a core and a plurality of outer layer strands twisted around an outer periphery of the core; and

a car suspended by the elevator rope,

each of the outer layer strands has:

a centerline;

a resin center line coating body which coats the periphery of the center line;

9. The elevator arrangement according to claim 8,

the center line is electrically conductive.

10. The elevator apparatus according to claim 9, further comprising:

a control device; and

an energizing device that energizes at least a portion of the center line,

the control device determines whether the outer layer sub-rope is broken or not by confirming the conduction state of the central line.

11. The elevator arrangement according to claim 10,

and the control device judges whether the service can be continued according to the existence of the fracture of the outer layer sub-rope.