CN107709214B - Main suspension cable for elevator and elevator device using same - Google Patents
Main suspension cable for elevator and elevator device using same Download PDFInfo
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- CN107709214B CN107709214B CN201580080619.0A CN201580080619A CN107709214B CN 107709214 B CN107709214 B CN 107709214B CN 201580080619 A CN201580080619 A CN 201580080619A CN 107709214 B CN107709214 B CN 107709214B
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- sling
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- 239000000725 suspension Substances 0.000 title claims description 19
- 239000011248 coating agent Substances 0.000 claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 14
- 239000011347 resin Substances 0.000 claims abstract description 10
- 229920005989 resin Polymers 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 description 15
- 239000010959 steel Substances 0.000 description 15
- 230000007423 decrease Effects 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- 238000005452 bending Methods 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 4
- 238000009661 fatigue test Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000011835 investigation Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000000470 constituent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/06—Arrangements of ropes or cables
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/02—Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics
- D07B1/04—Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics with a core of fibres or filaments arranged parallel to the centre line
Landscapes
- Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
- Ropes Or Cables (AREA)
Abstract
The invention provides a main sling (2) for an elevator, which can prolong the service life of the sling. The elevator main sling (2) comprises: an IWRC including a core strand (7), a plurality of side strands (8A to 8F) arranged around the core strand (7), and a coating resin (9) coating the core strand (7) and the plurality of side strands (8A to 8F); and a plurality of main strands (10A-10J) arranged around the IWRC, wherein the plurality of side strands (8A-8F) are arranged at substantially equal intervals on the circumference of a virtual layer center circle (11) where the centers of the plurality of side strands (8A-8F) are located, and the total ratio of the gaps (a) between two adjacent side strands (8A-8F) in the circumferential direction of the virtual layer center circle (11) among the plurality of side strands (8A-8F) is 8.5% or more with respect to the circumferential length of the virtual layer center circle (11), or the ratio of the gaps (b) between the virtual circumscribed circles of the plurality of side strands (8A-8F) and the virtual inscribed circle (12) of the plurality of main strands (10A-10J) is 3.0% or more with respect to the radius of the virtual inscribed circle (12) of the plurality of main strands (10A-10J).
Description
Technical Field
The present invention relates to an elevator rope used for raising and lowering a car and an elevator apparatus using the same.
Background
A car of an elevator apparatus is suspended by a main rope in a hoistway and driven to ascend and descend. In such a main rope for an elevator, a plurality of main strands are twisted around a steel core.
In order to ensure both the strength and the flexibility of the main sling, an Independent Wire Rope Core (IWRC) which is one Independent sling is used as the Steel Core. As a conventional technique related to IWRC, the technique described in patent document 1 is known. In this conventional elevator main sling, a steel wire having 2050N/mm is used as a core strand and a side strand of IWRC2The steel wire having the above strength was used as the steel wire of the main strand and had 1770N/mm2Steel wire having the following strength. Further, the total breaking load of the core strands of the IWRC is set to a magnitude of 0.4 times or more and 0.6 times or less of the total breaking load of all the main strands.
Documents of the prior art
Patent document
Patent document 1: JP 5307395A
Disclosure of Invention
Problems to be solved by the invention
In the above-described conventional main slings, contact of the core strand and the side strands or contact of the side strands with each other of the IWRC is liable to occur. When tension is applied to the main ropes or the main ropes are bent while passing over sheaves (belts) and pulleys (pulleys) of the elevator, the strands come close to each other and contact each other, thereby rubbing each other. This causes a problem that the strands wear, and the life of the main sling is shortened.
Therefore, the invention provides a main sling for an elevator and an elevator device using the same, wherein the service life of the sling can be prolonged.
Means for solving the problems
In order to solve the above problem, the main sling for an elevator of the present invention includes: an IWRC (Independent Wire Rope Core) having a Core strand, a plurality of side strands arranged around the Core strand, and a coating resin coating the Core strand and the plurality of side strands; and a plurality of main strands disposed around the IWRC, wherein the plurality of side strands are disposed at substantially equal intervals on the circumference of an imaginary layer center circle in which the centers of the plurality of side strands are located, and the ratio of the total of the gaps between two adjacent side strands in the circumferential direction of the imaginary layer center circle among the plurality of side strands is 8.5% or more with respect to the circumference of the imaginary layer center circle.
In order to solve the above problem, the elevator main rope according to the present invention includes: an IWRC (Independent Wire Rope Core) having a Core strand, a plurality of side strands arranged around the Core strand, and a coating resin coating the Core strand and the plurality of side strands; and a plurality of main strands disposed around the IWRC, wherein a ratio of a gap between each of the virtual circumscribed circles of the plurality of side strands and the virtual inscribed circle of the plurality of main strands with respect to a radius of the virtual inscribed circle of the plurality of main strands is 3.0% or more.
Further, an elevator apparatus according to the present invention includes: a car and a counterweight; a main sling for suspending the car and the counterweight in the lifting passage; and a hoist for driving the main rope, the main rope being the main rope for an elevator of the present invention.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, the strands constituting the IWRC can be prevented from contacting each other, and thus the life of the sling can be improved. In addition, the reliability of the elevator device can be improved, or the maintenance of the elevator device can be facilitated.
Problems, structures, and effects other than those described above will become more apparent from the following description of the embodiments.
Drawings
Fig. 1 is a schematic configuration diagram of an elevator apparatus according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view showing an elevator main sling according to an embodiment of the present invention.
Fig. 3 is a cross-sectional view showing the size of the gap between the strands.
Fig. 4 shows the relationship between the steel wire friction dimension ratio and the spacing ratio a.
FIG. 5 shows the relationship between the number-of-wire friction ratios and the spacing ratio B.
Fig. 6 shows an example of the relationship between the spacing ratio a and the spacing ratio B.
Fig. 7 shows a cross section of a representative sample in a main sling sample.
Fig. 8 shows a cross section of a representative sample in a main sling sample.
Fig. 9 shows a cross section of a representative sample in a main sling sample.
Fig. 10 shows a cross section of a representative sample in a main sling sample.
Fig. 11 shows a cross section of a representative sample in a main sling sample.
Fig. 12 shows a cross section of a representative sample in a main sling sample.
FIG. 13 shows the relationship between the steel wire friction dimension ratio and the spacing ratio A and the relationship between the steel wire friction number ratio and the spacing ratio B.
Fig. 14 shows the allowable contrast ratio of the breaking strength of the suspension cable in relation to the number of suspension cables suspended.
Fig. 15 shows the relationship between the contrast ratio of the breaking strength of the sling and the interval ratio a.
Detailed Description
Embodiments of the present invention are described below with reference to the drawings. In the drawings, the same constituent elements or constituent elements having similar functions are denoted by the same reference numerals.
Fig. 1 is a schematic configuration diagram of an elevator apparatus according to an embodiment of the present invention.
As shown in fig. 1, one end of the main rope 2 is connected to the car 3, and the other end of the main rope 2 is connected to the counterweight 4. The main rope 2 is wound around a sheave of the hoist 1 and a diverting pulley 20. The car 3 and the counterweight 4 are suspended by the main ropes 2 in an elevator shaft not shown. When the sheave is rotated by the motor of the hoist 1, the main rope 2 is driven, and thus the car 3 and the counterweight 4 are raised and lowered while being guided by a guide rail not shown. As the main rope 2, a main rope for an elevator according to an embodiment of the present invention described later is used.
According to the present embodiment, as described later, the reliability of the elevator apparatus is improved because the life of the main rope 2 is improved while suppressing a decrease in the strength of the main rope 2. Further, the frequency of maintenance point inspections of the main rope can be reduced by increasing the life of the main rope, and therefore, the maintenance of the elevator apparatus is facilitated. Further, since the strength of the main rope is suppressed from being lowered, the increase in the number of ropes suspended for a desired load amount can be suppressed, and therefore, the increase in the size of the sheave and the pulley and the increase in the rope installation space in the hoistway can be suppressed.
Fig. 2 is a cross-sectional view showing an elevator main sling according to an embodiment of the present invention. Fig. 2 shows a cross section of the main sling in a direction perpendicular to the longitudinal direction (the same applies to other cross sections).
As shown in fig. 2, the elevator main suspension rope according to the present embodiment includes an IWRC serving as a suspension rope core and 10 main strands 10A to 10J, and the 10 main strands 10A to 10J are disposed around the IWRC and twisted around the outer periphery of the IWRC. The primary strands 10A to 10J are tangent to the outer peripheral surface of the IWRC. In the main sling cross section, the main strands 10A to 10J are arranged at substantially equal intervals in the circumferential direction around the IWRC.
The IWRC has: 1 core strand 7 disposed in the center of the main sling; 6 side strands 8A to 8F twisted around the outer periphery of the core strand 7 while being twisted with a space from the core strand 7; the covering resin 9 covers the entire periphery of the core strand 7 and the side strands 8A to 8F, including the space between the core strand 7 and the side strands 8A to 8F and the space between the side strands. The side strands 8A to 8F are arranged such that: in the main sling cross section, the centers of the side strands 8A to 8F are located at equal intervals on the same circumference centering on the center of the core strand 7, i.e., the center of the IWRC (i.e., the main sling center). In this way, the IWRC is constituted by a separate sling having a circular cross section, which is constituted by the core strand 7, the side strands 8A to 8F, and the coating resin 9.
The main strands 10A to 10J, the core strand 7, and the side strands 8A to 8F have a known structure in which a plurality of steel wires made of steel wires are twisted to form a strand having a substantially circular cross section.
In the main sling cross section of fig. 2, the strand diameters (diameters) of the core strand 7 and the side strands 8A to 8F are equal to each other and are set to a value smaller than the strand diameters (diameters) of the main strands 10A to 10J. In addition, by making the respective strand diameters of the IWRC equal in this way, the types of strand diameters of the strands constituting the main sling can be reduced, and therefore, productivity can be improved or cost can be reduced. Further, the strand diameters of the core strand 7 and the side strands 8A to 8F are set so that the coating resin 9 exists between the core strand 7 and the side strands 8A to 8F, between the side strands, and between the side strands 8A to 8F and the main strands 10A to 10J, on the basis of a given main hoist rope diameter (diameter) and its corresponding IWRC diameter (diameter). This prevents direct contact between the core strand 7 and the side strands 8A to 8F, between the side strands, and between the side strands 8A to 8F and the main strands 10A to 10J. Therefore, even if the main sling bears tension or bends when passing through a rope pulley or a pulley of an elevator, the abrasion of the steel wire caused by the contact between each strand can be prevented. Therefore, the life of the sling can be prolonged, and the strength of the sling can be prevented from being reduced over time.
Here, when the strand diameters of the core strands 7 and the side strands 8A to 8F are set so that the core strands 7 and the side strands 8A to 8F contact each other, the side strands contact each other, and the side strands 8A to 8F and the main strands 10A to 10J contact each other, in addition to the given main sling diameter and the IWRC diameter corresponding thereto, the strand diameters of the core strands 7 and the side strands 8A to 8F are increased as compared with the present embodiment, and therefore the strength is increased. That is, although the life of the sling can be extended in the present embodiment, the strength of the sling tends to be reduced on the other hand. Therefore, in the elevator apparatus, the number of suspension ropes for supporting the same load tends to increase.
On the other hand, according to a new finding obtained through the study of the inventors of the present invention regarding the life and strength of the main sling for an elevator, which will be described later, in the present embodiment, as shown in fig. 2, the strands in the IWRC are arranged such that gaps are provided between the core strand 7 and the side strands 8A to 8F, between the side strands, and between the side strands 8A to 8F and the main strands 10A to 10J, and the ratio of the total value of the gap size between the side strands 8A to 8F to the length of the circumference where the centers of the side strands 8A to 8F are located, that is, the circumferential length of the imaginary layer center circle of the side strands 8A to 8F is 8.5% to 20%. This can improve the life of the sling while suppressing a decrease in the strength of the sling.
The inventors of the present invention will next discuss the life and strength of the main suspension rope for an elevator.
Fig. 3 is a cross-sectional view similar to fig. 2, also showing the gap sizes (a, b) between the strands.
As shown in fig. 3, the side strands 8A to 8F are arranged at substantially equal intervals along the circumferential direction of the virtual layer center circle 11 with the centers of the side strands 8A to 8F positioned on the circumference of the virtual layer center circle 11 with the center of the core strand 7 as the center. Here, a represents a gap size between two adjacent side strands on the circumference of the virtual layer center circle 11. The main strands 10A to 10J are arranged at equal intervals along an imaginary inscribed circle 12 that is tangent to the surface of the IWRC, is inscribed in the main strands 10A to 10J, and is centered on the center of the core strand 7. Here, the gap size between the main strands and the side strands adjacent to each other in the radial direction of the main sling and the IWRC is b. In the following discussion, the size of the gap between the virtual circumscribed circles (circles having the center of the side strand as the center and the diameter of the strand as the diameter) of the two adjacent side strands is referred to as "a" and the size of the gap between the virtual circumscribed circles that are tangent to the outer peripheries of the side strands 8A to 8F and the virtual inscribed circle 12 of the main strands 10A to 10J is referred to as "b". In addition, in the main sling cross-section, the imaginary inscribed circle 12 coincides with the IWRC outer periphery (i.e., the outer periphery of the coating resin).
The "interval ratio a" and the "interval ratio B" of the parameters relating to the suspension rope structure in the following study results will be described.
The pitch ratio a is a ratio of the total value of the gap dimension a to the circumferential length of the imaginary layer center circle (11 in fig. 3) of the side strands, and is expressed by equation (1).
The spacing ratio a (%) (total value of a/circumference of a circle of the center of the virtual layer) × 100. (1)
In addition, since the number of strands is 6 in the case of fig. 3, for example, the total value of the gap size a becomes 6 a.
The spacing ratio B is a ratio of the gap dimension B to the radius of the virtual inscribed circle (12 in fig. 3) of the main strands, and is expressed by equation (2).
A spacing ratio B (%) (B/radius of the imaginary inscribed circle) × 100. (2)
Fig. 4 shows a relationship between the steel wire friction dimension ratio and the spacing ratio a, as a result of an investigation conducted by the present inventors. The results of this study are the results of repeated bending fatigue tests, using a planetary fatigue testing machine as the testing machine, and using 1/10 for the rope tension and 600 ten thousand times for the number of repeated bending times as the test conditions. After the bending test, the slings were disassembled, and the lengths of the wire friction traces in the wires of the strands of the IWRC were measured using an optical microscope. In fig. 4, the lengths of the wire friction marks for the respective spacing ratios are shown by the wire friction dimension ratios as the dimension ratios to the reference length, with the spacing ratio a being 0 (%), i.e., the length of the wire friction mark when the side strands are tangent without a gap in the circumferential direction of the imaginary layer center circle.
As shown in fig. 4, according to the study of the inventors of the present invention, if the spacing ratio a is set to 8.5% or more, friction is not generated in the wires of the strands of the IWRC. Therefore, by setting the interval ratio a to 8.5% or more, the life of the rope can be increased.
FIG. 5 shows the relationship between the number-of-friction-steel-wire ratio and the spacing ratio B, which is a result of investigation conducted by the present inventors. The results of this study are the results of repeated bending fatigue tests, and the testing machine and the test conditions are the same as those in the case of fig. 4. After the bending test, the slings were disassembled, and the number of wire friction marks in the wires of the strand of IWRC was measured using an optical microscope. In fig. 5, the number of wire friction marks for each of the spacing ratios is shown by the ratio of the number of wire friction marks as a ratio of the number of wire friction marks to the reference number, where the spacing ratio B is 0 (%), i.e., where the side strands and the main strands are in contact with each other without a gap in the radial direction of the imaginary inscribed circle.
As shown in fig. 5, according to the study of the inventors of the present invention, if the space ratio B is set to 3.0% or more, friction is not generated in the wires of the strands of the IWRC. Therefore, the interval ratio B is set to 3.0% or more, whereby the life of the rope can be increased.
Fig. 6 shows an example of the relationship between the spacing ratio a and the spacing ratio B in the study of the inventors of the present invention. Plots 13 to 18 in the figure show values of the spacing ratio a and the spacing ratio B of representative samples in the main sling sample under study by the inventors of the present invention.
In the IWRC of the main sling sample under the study of the inventors of the present invention, 6 side strands were arranged at equal intervals along the same imaginary layer center circumference around one core strand, in the same manner as in the embodiment of fig. 1, in addition to the predetermined sling diameter and the predetermined IWRC diameter. The strand diameter of the core strand and the strand diameter of the side strands are set to the same size d, the positions of the side strands in IWRC and the center of the core strand are not changed, and the gap dimensions a, b in fig. 3 are changed by changing d. In this case, the imaginary layer center circle passes through the center of the side strand in the case of the maximum d, i.e., in the case of the adjacent strands being tangent without a gap, and the position of this center does not change even if d changes.
In this case, the outer shapes of the cross-sectional shapes of the side strands and the core strand are regarded as circles, and the maximum value of d, which is the value of d when a is 0 and B is 0, is d0Then, the total value of the gap size a is 6 (d) to 6 (6 a)0-d), the circumference of the circle of the centre of the imaginary layer being 2 pi d0The gap size b ═ d0-d)/2, the radius of the imaginary inscribed circle being 3d02, therefore according to formulae (1), (2), a is 100 × 3 (d)0-d)/(π·d0)、B＝100×(d0-d)/3do. Thus, formula (3) is obtained.
B＝πA/9…(3)
As shown in equation (3), the spacing ratio B is proportional to the spacing ratio a. On the other hand, the representative samples of the main sling samples under study by the inventors of the present invention are plotted in a substantially straight line with the interval ratio a and the interval ratio B in a proportional relationship, as shown in fig. 6, in plots 13 to 18. The diameters of the side strands and the core strands of the main sling sample corresponding to the plot 13 are the largest in the case of the plot 13, and the gap sizes a and b become 0, so the spacing ratio A, B becomes 0. The diameters of the side strands and core strands of the main sling sample corresponding to plots 14-18 become smaller in order of the plot number, and the gap sizes a and b become larger, so that the spacing ratio A, B increases. In plots 13 to 18, (A, B) are (0, 0), (6, 2.1), (10, 3.6), (14.3, 5.1), (18, 6.3), (24, 8.3), respectively, and approximately satisfy the relationship of formula (3).
If the proportional relationship described above is set between the spacing ratios A, B as in the main sling sample under study by the inventors of the present invention, one of A.gtoreq.8.5% (FIG. 3) and B.gtoreq.3% (FIG. 4) will be satisfied.
Fig. 7 to 12 show cross sections of representative samples of the main sling samples under study by the inventors of the present invention. Fig. 7, 8, 9, 10, 11 and 12 show the main sling samples with plots 13, 14, 15, 16, 17 and 18 (a, B) in fig. 6, respectively. In the main sling samples of fig. 7 to 12, the main sling diameter, the IWRC diameter, the number of main strands (10), and the strand diameter of the main strands were constant without changing. Further, since the strand diameter of the side strands and the strand diameter of the core strands are the same size, the types of strand diameters constituting the main suspension cable can be reduced, and therefore, productivity can be improved or cost can be reduced.
The main sling samples shown in fig. 7 are a-0 and B-0 (plot 13 of fig. 6). Therefore, the side strands contact each other in the circumferential direction of the layer center circle 11 in the IWRC. Further, each side strand is tangent to an imaginary inscribed circle 12 of the main strand, i.e., the outer circumferential surface of the IWRC. Thus, in the main sling sample of fig. 7, the side strands 8B are in contact with the main strands 10C and the side strands 8E are in contact with the main strands 10H in the radial direction of the main sling, i.e., the radial direction of IWRC.
In the main sling samples shown in fig. 8 to 12, the centers of the 6 side strands are located on the same circumference of the layer center circle 11 as the main sling sample shown in fig. 7, and are arranged at equal intervals along the circumferential direction of the layer center circle 11. The diameters of the side strands and the core strands are reduced in the order of fig. 8-12. That is, the center positions of the side strands and the core strands were not changed from the main sling sample of fig. 7, and the sizes of the strand diameters were changed. In addition, the diameter of the imaginary inscribed circle 12 of the primary strand is the same as the primary sling sample of fig. 7. Thus, gaps are provided between the core strands and the side strands, between the side strands, and between the main strands and the side strands. Therefore, contact between the side strands and the main strand can be prevented, and the life of the sling can be increased.
Fig. 13 shows the relationship between the steel wire friction dimension ratio and the spacing ratio a and the relationship between the steel wire friction number ratio and the spacing ratio B, which are the results of an investigation conducted by the inventors of the present invention. The results of the present study are the results of repeated bending fatigue tests on main sling samples having various spacing ratios A, B in the proportional relationship shown in fig. 6, as represented by the main sling samples shown in fig. 7 to 12. The test machine, test conditions, measurement method, and the like are the same as the results of the study shown in fig. 4 and 5.
As shown in fig. 13, with respect to the main sling samples shown in fig. 7 to 12, that is, the main sling sample having the spacing ratio A, B in the relationship shown in fig. 6, if the spacing ratio a is 8.5% or more or the spacing ratio B is 3.0% or more, friction caused by contact between the strands can be prevented. Thus, the life of the sling can be increased. Here, the interval ratio a of 8.5% or more corresponds to the interval ratio B of 3% or more, based on the relationship shown in fig. 6 or the relationship of expression (3). Therefore, if the spacing ratio a is 8.5% or more, the strands can be prevented from contacting each other, and the life of the sling can be increased.
In the elevator main sling according to the embodiment shown in fig. 1 and the elevator main sling samples shown in fig. 7 to 12, 6 side strands are arranged around one core strand. The 6 straight lines connecting the centers of the 6 side strands to the centers of the adjacent side strands along the circumferential direction of the layer center circle describe a regular hexagon. Therefore, in the case where the spacing ratio A, B is 0, the core strands as well as the side strands are most closely packed within IWRC having a given diameter, i.e., within the imaginary inscribed circle 12 of the primary strands. Therefore, the total cross-sectional area of the IWRC strands of the main sling sample shown in fig. 7 is the largest among the main sling samples shown in fig. 7 to 12. Therefore, the main sling samples shown in fig. 7 to 12 have the largest sling breaking strength among the main sling samples shown in fig. 7, in which the interval ratio A, B is 0. However, as described above, if the interval ratio a is set to 8.5% or more to improve the life of the rope, the diameter of the strands in the IWRC becomes small, and the total cross-sectional area of the strands decreases, so that the rope breaking strength decreases. When the breaking strength of the suspension cable is reduced, the number of suspension cables to be suspended in the elevator apparatus is increased, which leads to an increase in the size of the sheave or the pulley and an increase in installation space of the suspension cable. Therefore, the inventors of the present invention will next discuss the breaking strength of a suspension rope in consideration of the above point.
Fig. 14 shows the relationship between the allowable contrast ratio of the breaking strength of the suspension cable and the number of suspension cables as a result of the study by the inventors of the present invention. The allowable contrast ratio of the rope breaking strength means a ratio of the rope breaking strength allowable when the same load can be supported by increasing the number of the ropes to the rope breaking strength allowable when a certain load can be supported by a certain number of ropes. A curve 19 in fig. 14 shows a relationship between the ratio of the allowable breaking strength of the slings in the case where the same load is supported by increasing the number of the slings by 1 to the breaking strength of the slings in the case where a certain load can be supported by a certain number of the slings. Therefore, when the number of rope hanging members is n, the allowable contrast ratio of the rope breaking strength in fig. 19 is n/(n + 1). For example, the allowable sling breaking strength for a load supported by 4 main slings is 0.75 times the sling breaking strength for a load supported by 3 main slings.
As shown in fig. 14, when 3 to 10 slings are normally hung, the allowable contrast ratio of the breaking strength of the slings is set to 0.91 or more, so that the number of slings can be increased to 1 even if the breaking strength of the slings is reduced. That is, as shown in fig. 13, when the main rope having a reduced breaking strength is used while improving the life by setting the interval ratio a to 8.5% or more, the increase in the number of ropes to be suspended can be limited to 1 by setting the contrast ratio of the rope breaking strength to 0.91 or more, and the increase in the size of the sheave or the pulley and the installation space of the rope can be suppressed.
Fig. 15 shows the relationship between the contrast ratio of the breaking strength of the sling and the interval ratio a, as a result of the study by the inventors of the present invention. The present study results are directed to main rope samples having different IWRCs with different spacing ratios a, including the main rope samples shown in fig. 7 to 12, based on a predetermined main rope diameter. However, the number of the main strands is set to 6, 8, 10, or 12, which is generally used. The plot lines 20, 21, 22, and 23 in fig. 15 indicate the cases where the number of main strands is 6, 8, 10, and 12, respectively.
Since the larger the spacing ratio a, the smaller the strand diameter in the IWRC, the sling breaking strength decreases as shown in fig. 15. Even if the pitch ratio a is the same, the increase in the number of main strands decreases the breaking strength of the rope, because the increase in the number of main strands in addition to the predetermined diameter of the main rope decreases the diameter of the main strands. However, regarding the flexibility of the main sling for an elevator, it is preferable that the strand diameter of the main strands is small.
As described above, when the number of suspension ropes is increased to 1, the contrast ratio of the breaking strength of the suspension ropes is 0.91 or more. In order to satisfy this condition, as shown in fig. 15, when the number of main strands is 6, 8, 10, and 12, the pitch ratio a is set to 31.5% or less, 23% or less, 20% or less, and 18% or less, respectively. That is, if the pitch ratio a is 18% or less with respect to the number of normal main strands (6 to 12 strands), the number of rope hanging members can be increased to 1, and the size of the sheave or the pulley and the installation space of the rope can be suppressed from increasing.
As described above, if the spacing ratio a is 8.5% or more, the strands can be prevented from contacting each other, and the life of the sling can be increased. Therefore, if the pitch ratio a is set to 8.5% or more and 18% or less with respect to the number of normal main strands (6 to 12 strands), the life of the rope can be increased while suppressing a decrease in the strength of the rope. In the case where the number of main strands is 6, 8, 10, and 12, the interval ratio a is set to 8.5% or more and 31.5% or less, 8.5% or more and 23% or less, 8.5% or more and 20% or less, and 8.5% or more and 18% or less, respectively, whereby the fall in the strength of the sling can be suppressed and the life of the sling can be improved.
In addition, in the interval ratio a range in which the fall in the strength of the sling can be suppressed and the life of the sling can be improved as described above, it is preferable in terms of the mechanical balance that the number of the side strands of the IWRC is 6 as in the present embodiment and the side strands are arranged so as to draw a regular hexagon. Further, in such an arrangement, it is preferable that the side strands are arranged on the layer center circle in the case where the pitch ratio a is 0, and the strand diameters of the side strands and the core strands are made smaller than the case where the pitch ratio a is 0, thereby providing gaps between the strands. Thus, even if the sling strength is reduced, the maximum sling strength, which is the sling strength when the strands are packed most densely in the IWRC, is not significantly reduced, and the reduction in sling strength can be suppressed. Further, considering the flexibility of the main sling, it is preferable to set the number of the main strands to 10 as in the embodiment of fig. 2. This improves the balance of the main characteristics of the elevator main rope, such as flexibility, rope strength, and rope life.
Here, a comparison between the present embodiment and the conventional technique in patent document 1 and the like is described.
In the present embodiment, the range of the spacing ratio of the strands for improving the life of the elevator main sling having the IWRC is numerically clarified, but the numerical range of the spacing ratio is not clarified although there is a conventional technique of separating the strands from each other. In addition, in the conventional art, there is no idea of increasing the number of slings to be suspended by 1, and the numerical range of the interval ratio based on the idea is not clear in the conventional art. Further, the conventional technique does not disclose an arrangement structure of the side strands in which the side strands are arranged along the layer center circumference of the side strands assumed to be most closely packed in order to provide gaps between the strands while suppressing a decrease in strength.
The present invention is not limited to the above-described embodiments, and various modifications are also included. For example, the above-described embodiments have been described in detail to facilitate understanding of the present invention, but the present invention is not limited to having all of the described configurations. Further, a part of the structure of each embodiment may be added, deleted, or replaced.
For example, the main rope for an elevator of the present invention can be applied to an elevator having a machine room or an elevator without a machine room.
Description of the reference numerals
1 hoisting machine
2 Main sling
3 Car
4 balance weight
7 core strand
8A-8F side strand
9 coating resin
10A-10J main folded yarn
11 center circle of imaginary layer
12 imaginary inscribed circle
20 to a diverting pulley.
Claims (8)
1. A main sling for an elevator, comprising:
a separate wire rope core IWRC having a core strand, a plurality of side strands arranged around the core strand, and a coating resin coating the core strand and the plurality of side strands; and
a plurality of primary strands disposed around the IWRC,
the main suspension rope for an elevator is characterized in that,
the plurality of side strands are arranged substantially at equal intervals on the circumference of an imaginary layer center circle in which the respective centers of the plurality of side strands are located,
a ratio A of a total of gaps of two side strands adjacent in a circumferential direction of the virtual layer center circle among the plurality of side strands is 8.5% or more with respect to a circumferential length of the virtual layer center circle,
a ratio B of a gap between each of the imaginary circumscribed circles and the imaginary inscribed circle of the plurality of side strands with respect to a radius of the imaginary inscribed circle of the plurality of main strands is 3.0% or more,
the imaginary layer center circle is a layer center circle in a case where the same number of side strands as the plurality of side strands are most closely packed imaginary in the imaginary inscribed circle of the plurality of main strands,
the ratio of the allowable contrast ratio of the breaking strength of the slings when the number of the slings is increased by 1, that is, the ratio of the allowable breaking strength of the slings when the same load is supported by increasing the number of the slings by 1 to the breaking strength of the slings when the load can be supported by a certain number of the slings within the range of 3 to 10, is 0.91 or more.
2. Main sling for an elevator according to claim 1,
a relationship of B ═ pi a/9 exists between the ratio a and the ratio B.
3. Main sling for an elevator according to claim 1,
the strand diameter of the core strand and the strand diameter of the side strands are the same size.
4. Main sling for an elevator according to claim 1,
when the number of the plurality of main strands is 6, the ratio is 31.5% or less.
5. Main sling for an elevator according to claim 1,
when the number of the plurality of main strands is 8, the ratio is 23% or less.
6. Main sling for an elevator according to claim 1,
when the number of the plurality of main strands is 10, the ratio is 20% or less.
7. Main sling for an elevator according to claim 1,
when the number of the plurality of primary strands is 12, the ratio is 18% or less.
8. An elevator device is provided with:
a car and a counterweight;
a main hoist rope for hoisting the car and the counterweight in a hoistway; and
a hoist driving the main hoist rope,
the elevator arrangement is characterized in that it is provided with,
the main sling is provided with:
a separate wire rope core IWRC having a core strand, a plurality of side strands arranged around the core strand, and a coating resin coating the core strand and the plurality of side strands; and
a plurality of primary strands disposed around the IWRC,
the plurality of side strands are arranged substantially at equal intervals on the circumference of an imaginary layer center circle in which the respective centers of the plurality of side strands are located,
a ratio A of a total of gaps of two side strands adjacent in a circumferential direction of the virtual layer center circle among the plurality of side strands is 8.5% or more with respect to a circumferential length of the virtual layer center circle,
a ratio B of a gap between each of the imaginary circumscribed circles and the imaginary inscribed circle of the plurality of side strands with respect to a radius of the imaginary inscribed circle of the plurality of main strands is 3.0% or more,
the imaginary layer center circle is a layer center circle in a case where the same number of side strands as the plurality of side strands are most closely packed imaginary in the imaginary inscribed circle of the plurality of main strands,
the ratio of the allowable contrast ratio of the breaking strength of the slings when the number of the slings is increased by 1, that is, the ratio of the allowable breaking strength of the slings when the same load is supported by increasing the number of the slings by 1 to the breaking strength of the slings when the load can be supported by a certain number of the slings within the range of 3 to 10, is 0.91 or more.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2015/066518 WO2016199204A1 (en) | 2015-06-08 | 2015-06-08 | Elevator main rope and elevator device using same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107709214A CN107709214A (en) | 2018-02-16 |
| CN107709214B true CN107709214B (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580080619.0A Active CN107709214B (en) | 2015-06-08 | 2015-06-08 | Main suspension cable for elevator and elevator device using same |
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| Country | Link |
|---|---|
| JP (1) | JP6607935B2 (en) |
| CN (1) | CN107709214B (en) |
| WO (1) | WO2016199204A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6767327B2 (en) | 2017-09-11 | 2020-10-14 | 株式会社日立製作所 | Elevator rope |
| CN111996662A (en) * | 2020-08-10 | 2020-11-27 | 泰安科鼎特工贸有限公司 | Wear-resistant twisted rope and weaving method thereof |
| WO2023053192A1 (en) * | 2021-09-28 | 2023-04-06 | 三菱電機株式会社 | Rope and manufacturing method therefor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1254776A (en) * | 1998-11-25 | 2000-05-31 | 因温特奥股份公司 | Synthetic fibre rope without jacket |
| CN1379730A (en) * | 2000-08-21 | 2002-11-13 | 三菱电机株式会社 | Hoisting rope |
| CN1659094A (en) * | 2002-06-07 | 2005-08-24 | 通力股份公司 | Elevator provided with a coated hoisting rope |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3910377B2 (en) * | 2001-04-25 | 2007-04-25 | 東京製綱株式会社 | Wire rope |
| JP3827610B2 (en) * | 2001-05-21 | 2006-09-27 | 東京製綱株式会社 | Multilayer twisted wire rope |
| JP4374293B2 (en) * | 2004-07-15 | 2009-12-02 | 株式会社日立製作所 | Wire rope and wire rope deterioration detection method |
| JP4625043B2 (en) * | 2007-03-30 | 2011-02-02 | 東京製綱株式会社 | Wire rope for moving cable |
-
2015
- 2015-06-08 WO PCT/JP2015/066518 patent/WO2016199204A1/en active Application Filing
- 2015-06-08 JP JP2017522775A patent/JP6607935B2/en active Active
- 2015-06-08 CN CN201580080619.0A patent/CN107709214B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1254776A (en) * | 1998-11-25 | 2000-05-31 | 因温特奥股份公司 | Synthetic fibre rope without jacket |
| CN1379730A (en) * | 2000-08-21 | 2002-11-13 | 三菱电机株式会社 | Hoisting rope |
| CN1659094A (en) * | 2002-06-07 | 2005-08-24 | 通力股份公司 | Elevator provided with a coated hoisting rope |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6607935B2 (en) | 2019-11-20 |
| WO2016199204A1 (en) | 2016-12-15 |
| JPWO2016199204A1 (en) | 2018-02-08 |
| CN107709214A (en) | 2018-02-16 |
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