Wire rope wire breakage detection device and wire rope wire breakage detection method

Abstract

To provide a wire rope wire breakage detection device and a wire rope wire breakage detection method capable of detecting wire breakage in a wire rope with a simple configuration and reducing the labor or adverse effects caused when detecting wire breakage. [Solution] The wire rope strand breakage detection device according to the present disclosure includes a conductive member that is disposed around the wire rope with a gap therebetween and forms a ring shape surrounding the wire rope with a single conductive line, 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 passing through the conductive member. The detection unit detects the interruption of electricity passing through the conductive member caused by the protrusion of a broken strand of the wire rope causing the conductive member to break, thereby detecting the occurrence of a strand breakage in the wire rope.

Description

[Technical field]

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

[0002] The following Patent Document 1 proposes a method of detecting a break in a wire by passing a looped object through a wire rope, which gets caught on a protruding wire of the wire rope and moves, thereby breaking the conductor. [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 the breakage of the wire rope is detected, it is considered to be time-consuming to retrieve the loop, such as checking the entire circumference of the wire rope. In addition, if the machine is operated with the loop left behind, it is possible 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. 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 a wire breakage in a wire rope with a simple configuration and 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 that is arranged with a gap around the wire rope and forms a circular shape surrounding the wire rope with a single conductive line, and a detection unit that is connected to one and the other ends of the conductive member and passes electricity through the conductive member and detects whether electricity is passing through the conductive member.The detection unit detects the stop of electricity flow caused by the protrusion of a broken wire of the wire rope breaking the conductive member, thereby detecting the occurrence of a wire break in the wire rope. The wire rope wire break detection method of the present disclosure uses a conductive member that is arranged with a gap around the wire rope and forms a circular shape surrounding the wire rope with a single conductive line, and a detection unit that is connected to one and the other ends of the conductive member, passes electricity through the conductive member, and detects whether electricity is passing through the conductive member.The detection unit detects the stop of electricity flow caused by the protrusion of a broken wire of the wire rope breaking the conductive member, thereby detecting the occurrence of a wire break in the wire rope. Effect 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 arise when detecting a wire breakage. [Brief description of the drawings]

[0008] [Figure 1] 1 is a diagram showing a wire rope wire breakage detection device according to a first embodiment. FIG. [Diagram 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. [Diagram 3] 3A and 3B are diagrams illustrating an example of the structure of a conductive member according to the first embodiment. [Figure 4] 13 is a diagram showing an example of a method of installing a conductive member when there are multiple wire ropes. FIG. [Diagram 5] FIG. 4 is a diagram showing an example of a voltage level detected by a control panel. [Figure 6] 2 is a diagram showing an example of an operation flow in the wire rope wire breakage detection device of embodiment 1. FIG. [Figure 7] FIG. 2 is a diagram showing an example of a configuration for realizing the functions of a control panel in the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the embodiments will be described with reference to the drawings. In each drawing, the same reference numerals are used to denote common or corresponding elements, and the description is simplified or omitted. In addition, the configurations shown in the embodiments shown below are examples of the technical ideas related to the present disclosure, and may be combined with other known technologies, or multiple technical ideas described in the present disclosure may be combined. In addition, it is also possible to omit or modify a part of the configuration without departing from the gist of the present disclosure.

[0010] Embodiment 1 Fig. 1 is a diagram showing a wire rope strand breakage detection device 1 according to a first embodiment. As shown in Fig. 1, the wire rope strand breakage detection device 1 includes a ring-shaped conductive member 2, a power source 3 connected to a terminal on one end side of the conductive member 2, and a control panel 4 connected to a terminal on the other end side of the conductive member 2. The conductive member 2 is disposed around the wire rope 90 with a gap provided. The conductive member 2 is a single conductive line formed into a ring shape surrounding 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 number of wires to form a strand, and then twisting a number of strands around a core rope. The wires are the individual steel wires that make up the strand.

[0012] The ring-shaped 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, so that the control panel 4 detects that the voltage is ON.

[0013] When wire rope 90 moves with wire breakage 91 protruding from it, conductive member 2 is easily broken by wire breakage 91 hitting conductive member 2, forming broken part 21. When the current to conductive member 2 is stopped due to the breakage, control panel 4 detects that the voltage is OFF, and determines that a wire breakage has occurred in wire rope 90.

[0014] In this embodiment, the power source 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 applied.

[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 is not entangled in the hoist or sheave, so there is no risk of damaging them.

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

[0017] Fig. 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 hoist 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. Since the inner diameter of the conductive member 2 is slightly larger than the outer diameter of the wire rope 90, for example, if the conductive member 2 is attached at a position where the wire rope 90 vibrates, the wire rope 90 may come into contact with the conductive member 2, which may damage 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. The vicinity of the main sheave 95 refers to, 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. The vicinity of the deflection sheave 96 refers to, 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] According to the present embodiment, since the protruding broken wire 91 of the wire rope 90 can be detected accurately with a simple structure, the time required for maintenance and inspection can be reduced. In addition, by preventing the deterioration state of the wire rope 90 from being overlooked, events such as breakage of the wire rope 90 can be prevented, leading to improved safety.

[0021] Fig. 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. In this way, by overlapping the conductive member 2 in the circumferential direction and forming a structure that has a circular shape when viewed from directly above, a protruding wire 91 caused by a broken wire will come into contact with the conductive member 2 no matter where on the circumference of the wire rope 90 it occurs. This makes it possible to reliably prevent 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 have enough strength 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 is no electrical continuity there, and thus erroneous detection can be prevented.

[0024] Fig. 4 is a diagram showing an example of a method of installing the conductive members 2 when there are multiple wire ropes 90. As shown in Fig. 4(a), the conductive members 2 may simply be installed side by side in the same number as the wire ropes 90, or, when the interval between the wire ropes 90 is narrow, as shown in Fig. 4(b), multiple conductive members 2 may be installed at different mounting heights. Alternatively, the conductive members 2 may be installed in a distributed manner at multiple positions 97 as shown in Fig. 2.

[0025] 5 is a diagram showing an example of the voltage level 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 breaks the conductive member 2, the detected voltage is in a Low state. This allows the control panel 4 to detect the occurrence of a broken wire.

[0026] 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, in step S2 it is determined 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 with a gap around wire rope 90 and forms a circular shape surrounding wire rope 90 with a single conductive wire, and a detection unit that is connected to one and the other ends of conductive member 2, passes electricity through conductive member 2, and detects whether electricity is passing through.The detection unit detects the stop of electricity flow caused by a protruding wire 91 of wire rope 90 breaking conductive member 2, thereby detecting the occurrence of a wire break in 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. Also, 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, multiple circuits, a programmed processor, parallel programmed processors, 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 board 4 are realized by software, firmware, or a combination of software and firmware.

[0031] The software and firmware are written as a program and stored in the memory 602. The program may be recorded in a computer-readable recording medium. The processor 601 realizes the functions of each unit by reading and executing the program stored in the 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 a RAM, a ROM, a flash memory, an EPROM, or an EEPROM, or a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, a DVD, or the like.

[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. Also, at least some of the functions of the control panel 4 may be implemented in 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 is disposed around the wire rope with a gap therebetween, and is 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 passing electricity through the conductive member and detecting whether electricity is passing through the conductive member; Equipped with A wire rope wire breakage detection device detects that a wire breakage has occurred in the wire rope by the detection unit detecting the interruption of current flow caused by the protrusion of a broken wire 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 equal to or less than 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 strand 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 each other. (Appendix 5) 5. The 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 is disposed around the wire rope with a gap therebetween, and is 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 passing electricity through the conductive member and detecting whether electricity is passing through the conductive member; Using A wire rope wire break detection method in which the detection unit detects the interruption of current flow caused by the protrusion of a broken wire of the wire rope breaking the conductive member, thereby detecting that a wire break has occurred in the wire rope. [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 disposed around the wire rope with a gap therebetween and forming a circular shape surrounding the wire rope with a single conductive line; a detection unit connected to one end and the other end of the conductive member, for passing electricity through the conductive member and detecting whether electricity is passing through the conductive member; Equipped with A wire rope wire breakage detection device detects that a wire breakage has occurred in the wire rope by the detection unit detecting the interruption of current flow caused by the protrusion of a broken wire in the wire rope disconnecting the conductive member.

2. 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 strand breakage detection device according to claim 1, wherein a portion of the conductive member on one end side and a portion of the conductive member on the other end side of the annular shape overlap each other without contacting each other.

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

6. a conductive member disposed around the wire rope with a gap therebetween and forming a circular shape surrounding the wire rope with a single conductive line; a detection unit connected to one end and the other end of the conductive member, for passing electricity through the conductive member and detecting whether electricity is passing through the conductive member; Using A wire rope wire break detection method in which the detection unit detects the interruption of current flow caused by the protrusion of a broken wire of the wire rope breaking the conductive member, thereby detecting that a wire break has occurred in the wire rope.

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