Detection device of wire rope strand breakage and detection method of wire rope strand breakage

Abstract

To provide a detection device of a wire rope strand breakage and a detection method of the wire rope strand breakage capable of detecting the wire rope strand breakage with a simple configuration and reducing time and effort or adverse effects generated when detecting the strand breakage.SOLUTION: A detection device of wire rope strand breakage according to the present disclosure comprises: a conductive member which is arranged around a wire rope with a gap, and forms an annular shape surrounding the wire rope with a single conductive wire; and a detection part which is connected to one end and the other end of the conductive member, performs energization to the conductive member, and detects the existence of energization. The detection device detects the generation of the strand breakage of the wire rope when the detection part detects the stoppage of energization generated by disconnection of the conductive member caused by the protrusion of the strand breakage of the wire rope.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a wire rope strand breakage detection device and a wire rope strand breakage detection method. [Background technology]

[0002] Patent Document 1 listed below proposes a method of detecting a broken wire by passing a loop through a wire rope, which catches on a protruding wire of the wire rope and moves, causing the conductor to break. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 6-73070 Summary of the Invention [Problem to be solved by the invention]

[0004] In the method of Patent Document 1, since the loop remains on the wire rope after detecting a wire break in the wire rope, it is thought that it is time-consuming to retrieve the loop, such as checking the entire circumference of the wire rope. Furthermore, if the train is operated with the loop remaining, it is thought that the loop may get caught in the hoist or sheave, causing damage to them.

[0005] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a wire rope wire breakage detection device and a wire rope wire breakage detection method that can detect wire breakage in a wire rope with a simple configuration and that can reduce the effort or adverse effects that occur when detecting a wire breakage. [Means for solving the problem]

[0006] The wire rope wire breakage detection device of the present disclosure comprises a conductive member arranged with a gap around the wire rope and forming a circular ring shape surrounding the wire rope with a single conductive wire, and a detection unit connected to one end and the other end of the conductive member, passing electricity through the conductive member and detecting whether electricity is flowing or not.The detection unit detects that a wire breakage has occurred in the wire rope by detecting the cessation of electricity flow caused by the protrusion of a broken wire in the wire rope breaking the conductive member. The wire rope wire break detection method of the present disclosure uses a conductive member that is arranged around the wire rope with a gap and forms a circular shape that surrounds the wire rope with a single conductive wire, and a detection unit that is connected to one end and the other end of the conductive member, passes electricity through the conductive member, and detects whether electricity is flowing or not.The detection unit detects the cessation of electricity flow that occurs when a broken wire of the wire rope protrudes and breaks the conductive member, thereby detecting that a wire break has occurred in the wire rope. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a wire rope wire breakage detection device and a wire rope wire breakage detection method that can detect wire breakage in a wire rope with a simple configuration and reduce the effort or adverse effects that occur when detecting a wire breakage. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram showing a wire rope strand breakage detection device according to a first embodiment. [Figure 2] 1 is a diagram showing an elevator device to which a wire rope wire breakage detection device according to a first embodiment is applied. [Figure 3] 3A and 3B are diagrams illustrating an example of the structure of a conductive member according to the first embodiment. [Figure 4] 10A and 10B are diagrams showing an example of a method for installing conductive members when there are multiple wire ropes. [Figure 5] FIG. 10 is a diagram showing an example of a voltage level detected by a control panel. [Figure 6] 3 is a diagram showing an example of an operation flow in the wire rope wire breakage detection device of the first embodiment. FIG. [Figure 7] FIG. 2 is a diagram illustrating an example of a configuration for realizing the functions of a control panel according to the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described with reference to the drawings. Common or corresponding elements in each drawing are designated by the same reference numerals, and descriptions thereof will be simplified or omitted. Furthermore, the configurations shown in the following embodiments are examples of the technical ideas of the present disclosure, and may be combined with other known technologies, or multiple technical ideas described in the present disclosure may be combined. Furthermore, it is also possible to omit or modify part of the configuration within the scope of the gist of the present disclosure.

[0010] Embodiment 1 Fig. 1 is a diagram showing a wire rope wire breakage detection device 1 according to a first embodiment. As shown in Fig. 1, the wire rope wire breakage detection device 1 includes an annular conductive member 2, a power source 3 connected to a terminal on one end of the conductive member 2, and a control panel 4 connected to a terminal on the other end of the conductive member 2. The conductive member 2 is arranged around the wire rope 90 with a gap provided. The conductive member 2 is a single conductive wire formed into a circular ring shape that surrounds the wire rope 90.

[0011] The wire rope 90 is used, for example, to suspend an elevator car. The wire rope 90 is made by twisting together a large number of wires to form strands, and then twisting multiple strands around a core rope. The wires are the individual steel wires that make up the strands.

[0012] The annular conductive member 2 has a diameter slightly larger than that of the wire rope 90, and is fixed at a distance so as not to touch the wire rope 90. When the conductive member 2 is not broken, the voltage of the power source 3 is applied to the control panel 4 via the conductive member 2, and the control panel 4 detects that the voltage is ON.

[0013] If wire rope 90 moves while wire rope 90 has a broken wire protruding from it 91, the broken wire protruding from wire 91 will hit conductive member 2, easily breaking conductive member 2 and forming broken part 21. When the power supply to conductive member 2 is stopped due to the break, control panel 4 detects that the voltage is OFF, and therefore determines that a broken wire in wire rope 90 has occurred.

[0014] In this embodiment, the power supply 3 and the control panel 4 are connected to one end and the other end of the conductive member 2, and correspond to a detection unit that energizes the conductive member 2 and detects whether or not electricity is being passed through.

[0015] When the protruding broken wire 91 hits the conductive member 2 and breaks the conductive member 2, the state in which one end and the other end of the conductive member 2 are supported is maintained, so the conductive member 2 does not move. Therefore, there is no need to take the time to retrieve the conductive member 2. Furthermore, even if the wire rope 90 moves in this state, the conductive member 2 will not get caught in the hoist or sheave, so it will not damage them.

[0016] It is desirable that the conductive member 2 be one that breaks when a certain amount of impact is applied. In other words, it is desirable that the conductive member 2 be made of a material whose shear stress at break is equal to or less than a standard value. In such a case, when a protruding wire 91 of the broken wire of the wire rope 90 hits the conductive member 2, the conductive member 2 easily breaks. Therefore, the occurrence of a broken wire of the wire rope 90 can be detected more reliably.

[0017] 2 is a diagram showing an elevator apparatus 92 to which the wire rope wire breakage detection device 1 of the first embodiment is applied. As shown in Fig. 2, the elevator apparatus 92 has a car 93, a counterweight 94, a hoisting machine having a main sheave 95, and a deflection sheave 96. A wire rope 90 is wound around the main sheave 95 and the deflection sheave 96.

[0018] Position 97 in FIG. 2 shows an example of a position for fixing the conductive member 2. Because the inner diameter of the conductive member 2 is only slightly larger than the outer diameter of the wire rope 90, if the conductive member 2 is attached in a position where the wire rope 90 vibrates, the wire rope 90 may come into contact with the conductive member 2, potentially damaging the conductive member 2. To prevent such an event, it is desirable to attach the conductive member 2 near the main sheave 95 or the deflection sheave 96. Near the main sheave 95 means, for example, a position where the distance from the center of the main sheave 95 is equal to or less than the diameter of the main sheave 95. Near the deflection sheave 96 means, for example, a position where the distance from the center of the deflection sheave 96 is equal to or less than the diameter of the deflection sheave 96.

[0019] With the wire rope wire breakage detection device 1 of this embodiment, the specific location where the wire breakage has occurred can be identified from the timing of detection of the wire breakage, the installation position of the conductive member 2, and the position of the elevator car 93 at that time.

[0020] This embodiment can accurately detect broken wires 91 in the wire rope 90 with a simple structure, thereby reducing the time required for maintenance and inspection. Furthermore, by preventing the deterioration of the wire rope 90 from being overlooked, it is possible to prevent events such as breakage of the wire rope 90, leading to improved safety.

[0021] 3 is a diagram showing an example of the structure of the conductive member 2 in the first embodiment. As shown in FIG. 3, in the annular shape of the conductive member 2, a portion on one end side of the conductive member 2 overlaps a portion on the other end side. By overlapping the conductive member 2 in the circumferential direction in this way and forming a structure that forms a circle when viewed from directly above, a protruding wire 91 caused by a broken wire will hit the conductive member 2 no matter where it occurs on the circumference of the wire rope 90. This reliably prevents the protruding wire 91 from slipping through the conductive member 2 without touching it.

[0022] One possible method of attaching and detaching the conductive member 2 is to slightly spread apart the overlapping portions of the conductive member 2 in the circumferential direction to create a gap large enough to pass the wire rope 90 through. Since the conductive member 2 needs to be strong enough to support its own weight and maintain its circular shape, possible materials for the conductive member 2 include extremely thin metal wires or conductive resins.

[0023] The conductive member 2 may be provided with an insulating coating. By providing an insulating coating, even if contact occurs somewhere along the conductive member 2, there will be no conduction there, and false detection can be prevented.

[0024] Figure 4 is a diagram showing an example of a method for installing conductive members 2 when there are multiple wire ropes 90. As shown in Figure 4(a), this may be a method in which the conductive members 2 are simply installed side by side in the same number as the wire ropes 90, or, if the spacing between the wire ropes 90 is narrow, as shown in Figure 4(b), a method in which multiple conductive members 2 are installed at different mounting heights may be used. Another possible method is to install the conductive members 2 in a distributed manner at multiple positions 97 as shown in Figure 2.

[0025] 5 is a diagram showing an example of voltage levels detected by the control panel 4. If the conductive member 2 is conductive, the voltage is in a high state, but if the protruding wire 91 hits the conductive member 2 and causes the conductive member 2 to break, the detected voltage becomes a low state. This allows the control panel 4 to detect the occurrence of a broken wire.

[0026] FIG. 6 shows an example of an operation flow of the wire rope wire breakage detection device 1 of the first embodiment. During normal operation in step S1, it is determined in step S2 whether the detection voltage of the control panel 4 is at a low level. If the detection voltage of the control panel 4 is not at a low level, it is determined that there is no abnormality, and the process returns to step S1 to continue normal operation. If the detection voltage of the control panel 4 becomes low in step S2, the process proceeds to step S3, it is determined that a wire of the wire rope 90 has broken, and a signal to that effect is sent to the monitoring room.

[0027] The wire rope wire break detection method of this embodiment uses a conductive member 2 that is arranged around the wire rope 90 with a gap and forms a circular shape surrounding the wire rope 90 with a single conductive wire, and a detection unit that is connected to one end and the other end of the conductive member 2, passes electricity through the conductive member 2, and detects whether electricity is flowing or not.The detection unit detects the cessation of electricity flow caused by a broken wire 91 of the wire rope 90 protruding and breaking the conductive member 2, thereby detecting that a wire break has occurred in the wire rope 90.

[0028] FIG. 7 is a diagram showing an example of a configuration for realizing the functions of the control panel 4 in the first embodiment. Each function of the control panel 4 is realized by, for example, a processing circuit. The processing circuit may be dedicated hardware 600. The processing circuit may include a processor 601 and a memory 602. A part of the processing circuit may be formed as the dedicated hardware 600, and the processing circuit may further include the processor 601 and the memory 602. In the example shown in FIG. 7, a part of the processing circuit is formed as the dedicated hardware 600. Furthermore, in the example shown in FIG. 7, the processing circuit further includes a processor 601 and a memory 602 in addition to the dedicated hardware 600.

[0029] The processing circuitry of which at least one portion is dedicated hardware 600 may be, for example, a single circuit, a multiple circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof.

[0030] When the processing circuitry includes at least one processor 601 and at least one memory 602, the functions of each part of the control panel 4 are realized by software, firmware, or a combination of software and firmware.

[0031] The software and firmware are written as programs and stored in memory 602. The programs may be recorded on a computer-readable recording medium. The processor 601 realizes the functions of each unit by reading and executing the programs stored in memory 602. The processor 601 is also called a CPU (Central Processing Unit), central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, or DSP. The memory 602 may be, for example, a non-volatile or volatile semiconductor memory such as RAM, ROM, flash memory, EPROM, or EEPROM, or a magnetic disk, flexible disk, optical disk, compact disk, minidisk, DVD, etc.

[0032] In this way, the processing circuit can realize the functions of the control panel 4 by hardware, software, firmware, or a combination of these. Each function of the control panel 4 may be realized by multiple devices working together, or by a single device. Furthermore, at least some of the functions of the control panel 4 may be implemented on a server or the like on an external network.

[0033] Various aspects of the present disclosure are summarized below as appendices.

[0034] (Appendix 1) a conductive member arranged around the wire rope with a gap therebetween, the conductive member being a single conductive line that forms a ring shape surrounding the wire rope; a detection unit connected to one end and the other end of the conductive member, for energizing the conductive member and detecting whether or not the conductive member is energized; Equipped with A wire rope wire breakage detection device that detects that a wire break has occurred in the wire rope by having the detection unit detect the interruption of current flow caused by the protrusion of a wire break in the wire rope disconnecting the conductive member. (Appendix 2) The wire rope wire breakage detection device described in Appendix 1, wherein the conductive member is made of a material whose shear stress at breakage is below a standard value, so that the conductive member easily breaks when a broken wire of the wire rope protrudes and hits the conductive member. (Appendix 3) 3. The wire rope wire breakage detection device according to claim 1 or 2, wherein the conductive member is provided with an insulating coating. (Appendix 4) A wire rope wire breakage detection device as described in any one of Supplementary Note 1 to Supplementary Note 3, wherein the portion of the conductive member on one end side and the portion on the other end side of the annular shape overlap. (Appendix 5) 5. A wire rope wire breakage detection device according to any one of claims 1 to 4, wherein the conductive member is installed in the vicinity of a sheave around which the wire rope is wound. (Appendix 6) a conductive member arranged around the wire rope with a gap therebetween, the conductive member being a single conductive line that forms a ring shape surrounding the wire rope; a detection unit connected to one end and the other end of the conductive member, for energizing the conductive member and detecting whether or not the conductive member is energized; Using A wire rope wire break detection method in which the detection unit detects that a wire break has occurred in the wire rope by detecting the interruption of current flow caused by the protrusion of a wire break in the wire rope breaking the conductive member. [Explanation of symbols]

[0035] 1 wire rope strand breakage detection device, 2 conductive member, 3 power supply, 4 control panel, 21 broken part, 90 wire rope, 91 protrusion, 92 elevator device, 94 counterweight, 95 main sheave, 96 deflection sheave, 97 position, 600 dedicated hardware, 601 processor, 602 memory

Claims

1. a conductive member arranged around the wire rope with a gap therebetween, the conductive member being a single conductive line that forms a ring shape surrounding the wire rope; a detection unit connected to one end and the other end of the conductive member, for energizing the conductive member and detecting whether or not the conductive member is energized; Equipped with A wire rope wire breakage detection device that detects that a wire break has occurred in the wire rope by having the detection unit detect the interruption of current flow caused by the protrusion of a wire break in the wire rope disconnecting the conductive member.

2. A wire rope wire breakage detection device as described in claim 1, wherein the conductive member is made of a material whose shear stress at breakage is below a standard value, so that the conductive member easily breaks when a broken wire of the wire rope protrudes and hits the conductive member.

3. The wire rope strand breakage detection device according to claim 1 or 2, wherein the conductive member is provided with an insulating coating.

4. 3. The wire rope wire breakage detection device according to claim 1, wherein a portion of the annular conductive member on one end side and a portion of the annular conductive member on the other end side overlap each other.

5. 3. The wire rope wire breakage detection device according to claim 1, wherein the conductive member is installed in the vicinity of a sheave around which the wire rope is wound.

6. a conductive member arranged around the wire rope with a gap therebetween, the conductive member being a single conductive line that forms a ring shape surrounding the wire rope; a detection unit connected to one end and the other end of the conductive member, for energizing the conductive member and detecting whether or not the conductive member is energized; Using A wire rope wire break detection method in which the detection unit detects that a wire break has occurred in the wire rope by detecting the interruption of current flow caused by the protrusion of a wire break in the wire rope breaking the conductive member.

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