EP3683179A1 - Aufzugseil - Google Patents

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Publication number
EP3683179A1
EP3683179A1 EP18853024.0A EP18853024A EP3683179A1 EP 3683179 A1 EP3683179 A1 EP 3683179A1 EP 18853024 A EP18853024 A EP 18853024A EP 3683179 A1 EP3683179 A1 EP 3683179A1
Authority
EP
European Patent Office
Prior art keywords
rope
elevator
strands
elevator rope
steel wires
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP18853024.0A
Other languages
English (en)
French (fr)
Other versions
EP3683179A4 (de
Inventor
Ryo Maeda
Masato Nakayama
Takashi Abe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of EP3683179A1 publication Critical patent/EP3683179A1/de
Publication of EP3683179A4 publication Critical patent/EP3683179A4/de
Pending legal-status Critical Current

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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
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0673—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core having a rope configuration
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/10—Rope or cable structures
    • D07B2201/1012—Rope or cable structures characterised by their internal structure
    • D07B2201/1014—Rope or cable structures characterised by their internal structure characterised by being laid or braided from several sub-ropes or sub-cables, e.g. hawsers
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/10—Rope or cable structures
    • D07B2201/104—Rope or cable structures twisted
    • D07B2201/1044—Rope or cable structures twisted characterised by a value or range of the pitch parameter given
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2024—Strands twisted
    • D07B2201/2025—Strands twisted characterised by a value or range of the pitch parameter given
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2401/00—Aspects related to the problem to be solved or advantage
    • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
    • D07B2401/2005—Elongation or elasticity
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2501/00—Application field
    • D07B2501/20—Application field related to ropes or cables
    • D07B2501/2007—Elevators

Definitions

  • the present invention relates to an elevator rope.
  • an elevator car is suspended by a wire rope (hereinafter, referred to as a "rope” or “elevator rope”).
  • This rope is wound around the drive sheave of a winding machine, and is driven by friction between the rope and the rope groove on the surface of the sheave to raise or lower the car.
  • a machine-room-less elevator in which a winding machine is installed in a hoistway, to have a smaller size of the winding machine in order to reduce the cross-sectional area of the hoistway.
  • Means for realizing this include making the drive sheave thinner. Making the drive sheave thinner makes it possible to reduce the dimension of the axial length of the winding machine, and to reduce the size of the winding machine. Because of this, as elevator ropes, high-strength ropes that individually have high breaking strengths and allow reduction of the required number of ropes for suspending a car are demanded.
  • PTL 1 discloses an elevator main rope including: an IWRC (Independent Wire Rope Core) having a core strand, a plurality of peripheral strands arranged around the core strand, and a covering resin that covers the core strand and the plurality of peripheral strands; and a plurality of main strands arranged around the IWRC.
  • IWRC Independent Wire Rope Core
  • the plurality of peripheral strands are arranged at approximately equal intervals on the circumference of an imaginary-layer core circle on which the center of each of the plurality of peripheral strands is positioned, and the ratio, to the circumferential length of the imaginary-layer core circle, of the sum of gaps between pairs of peripheral strands that are included in the plurality of peripheral strands, and are each adjacent to each other in the circumferential direction of the imaginary-layer core circle is equal to or higher than 8.5%.
  • the rope disclosed in PTL 1 is constituted by elementary wires.
  • the elementary wires are made thin by being subjected to wire drawing, and have a breaking strength which is increased to the level of 2300 MPa (the elementary-wire breaking strength of generally widely used elevator ropes is about 1620 to 1910 MPa).
  • the strength of a rope improves in proportion to the elementary-wire strength, which allows reduction of the number of ropes.
  • the number of ropes to be used for an elevator is determined on the basis of the ratio between the load to be borne per rope and the breaking strength, and improvement in the breaking strength per rope can reduce the number of ropes to be used per elevator.
  • the modulus of elasticity per elementary wire is not proportional to the breaking strength, and so the rigidity of entire ropes lowers corresponding to the reduced number of ropes. Accordingly, for example, when the load on ropes changed suddenly due to passengers getting in and off an elevator, the amount of elongation or contraction of the ropes increases, and the ride comfort deteriorates inevitably.
  • an object of the present invention is to provide elevator ropes that allow reduction of the amount of change of rope elongation that results from a change in rope tension due to passengers getting in and off an elevator even if the breaking strength of ropes is improved to reduce the number of ropes.
  • the present invention provides an elevator rope formed by intertwisting a plurality of strands formed by intertwisting a plurality of steel wires, wherein when a diameter of the elevator rope is defined as d (mm), intervals between turns of the strands are defined as a rope pitch P 1 , and intervals between turns of the steel wires are defined as a strand pitch P 2 , a ratio a of P 1 to d, a ratio b of P 2 to d and a breaking strength T (N) of the elevator rope satisfy the following Formula A.
  • E denotes a modulus of longitudinal elasticity (MPa) of a material used in the elevator rope
  • G denotes a modulus of transverse elasticity (MPa) of the material used in the elevator rope
  • N denotes the number of the strands.
  • the present invention provides an elevator rope formed by intertwisting a plurality of strands formed by intertwisting a plurality of steel wires, wherein the steel wires are formed by intertwisting a plurality of elementary wires, and when a diameter of the elevator rope is defined as d (mm), intervals between turns of the strands are defined as a rope pitch P 1 , and intervals between turns of the steel wires are defined as a strand pitch P 2 , a ratio a of P 1 to d, a ratio b of P 2 to d and a breaking strength T (N) of the elevator rope satisfy Formula A explained above.
  • the present invention can provide elevator wire ropes that allow reduction of the amount of change of rope elongation that results from a change in rope tension due to passengers getting in and off an elevator even if the breaking strength of ropes is improved to reduce the number of ropes.
  • Figure 1 is a side view schematically illustrating a first example of the elevator rope of the present invention.
  • the elevator rope 1 is formed by intertwisting a plurality of strands 2 formed by intertwisting a plurality of steel wires 3.
  • Figure 1 illustrates only one strand 2 and one steel wire 3 for better visibility of the drawing.
  • a core (a fiber core, a steel wire core, etc.) is arranged at the center of the elevator rope 1, and the strands 2 are twisted around the core.
  • the plurality of strands 2 are arranged with nearly equal gaps therebetween on the same circumference. The same also applies to the steel wires 3.
  • the strands 2 and the steel wires 3 may be arranged in a plurality of layers such as a two-layer arrangement in which two layers of the strands 2 and/or two layers of the steel wires 3 are arranged on circumferences, a three-layer arrangement in which three layers of the strands 2 and/or three layers of the steel wires 3 are arranged on circumferences, and the like.
  • the longitudinal length (interval of turns) of one complete turn of one strand 2 constituting the elevator rope is defined as a rope pitch P 1
  • the longitudinal length (interval of turns) of one complete turn of a steel wire 3 constituting the strand 2 is defined as a strand pitch P 2
  • the rope pitch P 1 is a longitudinal length over which one strand 2 makes one complete turn around the core
  • the strand pitch P 2 is a longitudinal length over which one steel wire 3 makes one complete around the central axis of a strand.
  • Figure 2 is a side view schematically illustrating a second example of the elevator rope of the present invention.
  • Figure 2 illustrates a steel wire 3 formed by intertwisting a plurality of elementary wires 3a.
  • the present invention can also be applied to an elevator rope with such a configuration.
  • the longitudinal length (interval of turns) of one complete turn of an elementary wire 3a constituting the steel wire 3 is defined as a steel-wire pitch P 3 .
  • Figure 3 is a figure illustrating a relationship between tension T and elongation ⁇ L ⁇ and ⁇ L ⁇ of the elevator rope.
  • the tension T acts on twisted strands in the axial direction of a central axis 30 of the twist.
  • Elongation of the strand 2 observed at this time is given as the sum of the elongation ⁇ L ⁇ produced by a shear force acting on cross-sections of the strand 2 to elongate the twist, and the elongation ⁇ L ⁇ produced by tension acting in the axial direction of an axis 31 extending in the direction perpendicular to the cross-sections of the strand 2 to generate minute distortions in the strand 2 itself (there is an angle ⁇ ° formed between the central axis 30 of the twist and the axis 31 in the direction perpendicular to strand cross-sections).
  • elongation ⁇ L 1 observed when tension T 1 acts on elevator rope with a length L 1 in the direction of the central axis of the twist of the strand can be expressed by the following Formula (1).
  • elongation ⁇ L 2 observed when tension T 2 is applied in the direction of the central axis of the twist of a steel wire 3 with a length L 2 can be expressed by the following Formula (2)
  • elongation ⁇ L 3 observed when tension T 3 is applied in the direction of the central axis of the twist of an elementary wire 3a with a length L 3 can be expressed by the following Formula (3).
  • L 1 denotes the length (mm) of the twist of the strand in its central-axis direction
  • L 2 denotes the length (mm) of the twist of the steel wire in its central-axis direction
  • L 3 denotes the length (mm) of the twist of the elementary wire in its central-axis direction.
  • G denotes the modulus of transverse elasticity (MPa) of the strands
  • S 1 denotes the cross-sectional area (mm 2 ) per strand
  • n 1 denotes the number of twists of the strands per length L 1
  • do denotes the rope diameter (mm) .
  • elongation ⁇ L 2 ⁇ observed when the tension T 2 is applied in the direction of the central axis of the twist of steel wires with the length L 2 is obtained from the following Formula (8) where K 2 ⁇ denotes the spring constant of the steel wires, and K 2 ⁇ can be expressed by a formula which is the following (9).
  • elongation ⁇ L 3 ⁇ observed when the tension T 3 is applied in the direction of the central axis of the twist of elementary wires with the length L 3 is obtained from the following Formula (10) where K 3 ⁇ denotes the spring constant of the elementary wires, and K 3 ⁇ can be expressed by a formula which is the following (11).
  • S 2 denotes the cross-sectional area (mm 2 ) per steel wire
  • n 2 denotes the number of twists of steel wires per length L 2
  • S 3 denotes the cross-sectional area (mm 2 ) per elementary wire
  • n 3 denotes the number of twists of elementary wires per length L 3
  • the numbers of twists of strands, steel wires and elementary wires are values determined by the rope pitch P 1 , the strand pitch P 2 , and the steel-wire pitch P 3 , and assuming that the ratio of the rope pitch to the rope diameter do is a (P 1 /d 0 ), the ratio of the strand pitch to the rope diameter d 0 is b (P 2 /d 0 ), and the ratio of the steel-wire pitch to the rope diameter d 0 is c (P 3 /d 0 ), the numbers of twists of strands, steel wires and elementary wires can be expressed by Formulae (12) to (14).
  • n 1 L 1 / d 0 ⁇ a
  • n 2 L 2 / d 0 ⁇ b
  • n 3 L 3 / d 0 ⁇ c
  • Figure 4 is a cross-sectional schematic diagram of an elevator rope having an outermost layer constituted by ten strands.
  • Figure 5 is a cross-sectional schematic diagram of an elevator rope having an outermost layer constituted by six strands.
  • the numbers of steel wires of the outermost layers of the strands are nine.
  • Figure 6 is a cross-sectional schematic diagram of an elevator rope including strands having outermost layers each constituted by six steel wires.
  • Figure 7 is a cross-sectional schematic diagram of an elevator rope including strands having outermost layers each constituted by twelve steel wires.
  • the numbers of strands at the outermost layers of the elevator ropes are eight.
  • Figure 8 is a cross-sectional schematic diagram of an elevator rope (threefold-twisted) having steel wires formed by twisting elementary wires.
  • strands, steel wires, and elementary wire are arranged almost evenly on circumferences. Accordingly, the strand diameter: d 1 , the steel-wire diameter: d 2 , the elementary-wire diameter: d 3 , the strand twist diameter: D 1 , the steel-wire twist diameter: D 2 , and the elementary-wire twist diameter: D 3 are obtained geometrically, and the relationships of the following Formulae (15) to (17) hold true.
  • d 1 d 0 ⁇ sin ⁇ / N 1 / 1 + sin ⁇ / N 1
  • D 1 d 0 ⁇ d 1
  • N 1 denotes the number of outermost-layer strands.
  • d 2 d 1 ⁇ sin ⁇ / N 2 / 1 + sin ⁇ / N 2
  • D 2 d 1 ⁇ d 2
  • N 2 denotes the number of outermost-layer steel wires.
  • d 3 d 2 ⁇ sin ⁇ / N 3 / 1 + sin ⁇ / N 3
  • D 3 d 2 ⁇ d 3
  • N 3 denotes the number of outermost-layer elementary wires.
  • T 1 T 0 / N 1
  • T 2 T 1 ⁇ S 2 / S 1
  • T 3 T 2 ⁇ S 3 / S 2
  • twist angles are determined by the rope pitch P 1 , the strand pitch P 2 , the steel-wire pitch P 3 , the strand twist diameter, the steel-wire twist diameter, and the elementary-wire twist diameter, and can be expressed by the following Formulae (21) to (23).
  • ⁇ 1 tan ⁇ 1 D 1 ⁇ ⁇ / d 0 ⁇ a
  • ⁇ 2 tan ⁇ 1 D 2 ⁇ ⁇ / d 0 ⁇
  • b ⁇ 3 tan ⁇ 1 D 3 ⁇ ⁇ / d 0 ⁇ c
  • ⁇ 1 denotes the strand twist angle (rad)
  • ⁇ 2 denotes the steel-wire twist angle (rad)
  • ⁇ 3 denotes the elementary-wire twist angle (rad).
  • the lengths of strands, steel wires, and elementary wires can be obtained by uses their twist angles.
  • a strand constituted by intertwisting a plurality of steel wires the length of the spiral of a twisted strand (the length of the strand when it is pulled tight) and the length of the twist of the steel wires in its central-axis direction are equal to each other.
  • the length of the spiral of a twisted steel wire the length of the steel wire when it is pulled tight
  • the length of the twist of the elementary wires in its central-axis direction are equal to each other.
  • L 1 L 1 / cos ⁇ 1
  • L 3 L 2 / cos ⁇ 2
  • E denotes the modulus of longitudinal elasticity (MPa) of the steel wire.
  • the elongation amount: ⁇ L 1 observed when tension: T 0 is applied to a twofold-twisted rope with a rope diameter: do and a length: L 1 which is constituted by N 1 strands and N 2 steel wires that are twisted at the ratio: a of the rope pitch to the rope diameter and at the ratio: b of the strand pitch to the rope diameter can be expressed by the following Formula (30).
  • [Equation 2] ⁇ L 1 L 1 4 T 0 d 0 2 ⁇ N 1 E E ⁇ 10 2 3 aG + E ⁇ 10 1 3 bG + 1
  • elongation that is produced by applying a load on twisted steel wires is the sum of elongation produced by elongation of the twist due to a shear force acting on rope cross-sections, and elongation produced by minute distortions of a strand itself due to a tension acting in the direction perpendicular to cross-sections. Therefore, by making the pitches of twists longer, it is possible to reduce elongation produced by the twists being elongated, and to suppress the overall elongation of the rope.
  • an elevator rope in the present invention (the numbers of strands, steel wires and elementary wires) is arbitrary.
  • twist pitches (of the steel wire 3 in the present invention) other than the outer two pieces (the rope 1 and the strand 2 in the present invention) constituting the elevator rope need not be considered in the present invention.
  • the tolerated rope-distortion amount is 0.092% when the distance to be travelled by an elevator in a typical high-rise apartment/office building: 80 m is used as a reference distance, and in addition the change amount of a load in the car is the rope factor of safety: 12 and the rope factor of safety: 10 (the minimum value of the safety value stipulated in the Building Standards Act).
  • the tolerated distortion amount in a case where a rope having not been receiving a load is brought into the state of the factor of safety: 10 is 0.55%. Therefore, attaining the factor of safety of 10 or higher requires making the rope-distortion amount 0.55% or smaller.
  • Figure 9 is a graph illustrating a relationship between the strand-pitch multiple and the rope-pitch multiple at the time when the rope-distortion amount is 0.55%.
  • the graph illustrates cases where the breaking strength of the material of steel wires is examined for four conditions which are 1770 MPa, 1910 MPa or lower, 2300 MPa or lower, and 3200 MPa.
  • the rope-distortion amount is smaller than 0.55% in areas outside each line (areas where the strand-pitch multiple and the rope-pitch multiple are large).
  • elevator ropes with the breaking strength of 1770 MPa are "Grade B” (JIS G3525) elevator ropes stipulated in the JIS standards (Japanese Industrial Standards), and elevator ropes with the breaking strength of 1910 MPa are "Grade T” (JIS G3525) elevator ropes stipulated in the JIS. These two types of elevator ropes are generally widely used. Elevator ropes with the breaking strength of 2300 MPa and 3200 MPa have strength still higher than those of the elevator ropes mentioned above that are generally widely used.
  • the rope pitch P 1 and the strand pitch P 2 that are required to make the rope-distortion amount 0.55% or smaller can be computed by substitution of the value of 1/10 (factor of safety: 10) of the rope breaking strength into Formula (32).
  • FIG. 10 is a side view schematically illustrating a rope fabricated for the test.
  • the diameter do of the elevator rope 1 is 8.0 (mm)
  • the number N 1 of the strands 102 is four
  • the number of the steel wires 103 at the outermost layers of the strands 102 is seven
  • the number of the elementary wires 103a at the outermost layers of the steel wires 103 is seven
  • the original rope length (the length of the twist of the strands in its central-axis direction) L 1 is 21000 (mm)
  • the applied load (tension To) is 6000 (N)
  • the modulus of longitudinal elasticity E of the steel wires is 205000 MPa
  • the modulus of transverse elasticity G of the steel wires is 170800 MPa.
  • the surface of the elevator rope 101 is covered with a resin 104 so as to prevent deformation of the rope.
  • Figure 11 is a graph illustrating a relationship between the rope elongation amount ⁇ L 1 , and the rope pitch P 1 and the strand pitch P 2 .
  • calculated values and experimental values are compared. It is supposed that the rope pitch is P 1 (mm), the strand pitch is P 2 (mm), and the steel-wire pitch is P 3 (mm) in the elevator rope 101 in Figure 10 , and experiments and calculation were performed for the following Conditions 1 to 3.
  • the three levels exhibit errors between the calculated values and the experimental values which are smaller than ⁇ 10%, and it can be confirmed that sufficient calculation accuracy is ensured.
  • the ratio a of the rope pitch P 1 to the rope diameter d and "the ratio b of the strand pitch P 2 to the rope diameter d” may be kept in ranges that satisfy the following Formula (32) in order to suppress rope-distortion amounts to the predetermined rope-distortion amount (0.55%) or smaller which is a condition required for elevator wire ropes to satisfy.
  • the present invention can provide elevator wire ropes that allow reduction of the amount of change of rope elongation that results from a change in rope tension due to passengers getting in and off an elevator even if the breaking strength of ropes is improved to reduce the number of ropes.
  • the present invention is not limited to the examples explained above, and includes various variants.
  • the examples explained above are explained in detail for explaining the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to embodiments including all the configurations explained.
  • addition, elimination and replacement of other configurations are possible for some of configurations of each example.

Landscapes

  • Ropes Or Cables (AREA)
  • Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
EP18853024.0A 2017-09-11 2018-07-17 Aufzugseil Pending EP3683179A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017173775A JP6767327B2 (ja) 2017-09-11 2017-09-11 エレベーターロープ
PCT/JP2018/026671 WO2019049514A1 (ja) 2017-09-11 2018-07-17 エレベーターロープ

Publications (2)

Publication Number Publication Date
EP3683179A1 true EP3683179A1 (de) 2020-07-22
EP3683179A4 EP3683179A4 (de) 2021-05-19

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ID=65633849

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18853024.0A Pending EP3683179A4 (de) 2017-09-11 2018-07-17 Aufzugseil

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EP (1) EP3683179A4 (de)
JP (1) JP6767327B2 (de)
CN (1) CN111065594B (de)
WO (1) WO2019049514A1 (de)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2019049514A1 (ja) 2017-09-11 2019-03-14 株式会社日立製作所 エレベーターロープ

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Publication number Priority date Publication date Assignee Title
CN109457520A (zh) * 2018-12-30 2019-03-12 辽宁通达建材实业有限公司 一种控制钢绞线弹性模量的方法

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JP2659072B2 (ja) * 1988-12-16 1997-09-30 住友電気工業株式会社 ゴム補強用スチールコード
JP2916520B2 (ja) * 1991-11-01 1999-07-05 東京製綱株式会社 耐疲労性ワイヤローブ
JP3910377B2 (ja) * 2001-04-25 2007-04-25 東京製綱株式会社 ワイヤロープ
MXPA04007358A (es) * 2002-01-30 2005-06-08 Thyssen Elevator Capital Corp Cuerda de fibra sintetica para elevador.
EP1597183B1 (de) 2003-02-27 2009-02-11 N.V. Bekaert S.A. Aufzugsseil
JP2006052483A (ja) * 2004-08-10 2006-02-23 Hitachi Building Systems Co Ltd ワイヤーロープ
JP5269838B2 (ja) * 2010-07-12 2013-08-21 株式会社日立製作所 エレベータ用ワイヤロープ
CN201773624U (zh) * 2010-08-23 2011-03-23 江苏河阳线缆有限公司 一种快速响应的高速电梯电缆
JP5758203B2 (ja) * 2011-06-03 2015-08-05 小松精練株式会社 紐状強化繊維複合体およびコンクリート補強筋材並びにブレース材
JP5806644B2 (ja) * 2012-05-31 2015-11-10 東京製綱株式会社 ハイブリッド心ロープ
JP2016011481A (ja) * 2014-06-30 2016-01-21 神鋼鋼線工業株式会社 難自転性ワイヤロープ
JP5947863B2 (ja) * 2014-11-13 2016-07-06 東京製綱株式会社 クレーン用ワイヤロープ
WO2016199204A1 (ja) 2015-06-08 2016-12-15 株式会社日立製作所 エレベータ用主ロープ並びにそれを用いるエレベータ装置
JP6452839B2 (ja) * 2015-10-16 2019-01-16 三菱電機株式会社 エレベータ用ロープ及びその製造方法
JP6767327B2 (ja) 2017-09-11 2020-10-14 株式会社日立製作所 エレベーターロープ

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Publication number Priority date Publication date Assignee Title
WO2019049514A1 (ja) 2017-09-11 2019-03-14 株式会社日立製作所 エレベーターロープ

Also Published As

Publication number Publication date
EP3683179A4 (de) 2021-05-19
WO2019049514A1 (ja) 2019-03-14
JP6767327B2 (ja) 2020-10-14
CN111065594B (zh) 2021-07-27
JP2019048698A (ja) 2019-03-28
CN111065594A (zh) 2020-04-24

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